The present invention relates to a fluid pressure cylinder that displaces a piston in an axial direction under the supply of a pressure fluid.
Conventionally, as a transport means for a workpiece or the like, for example, a fluid pressure cylinder having a piston that is displaced under the supply of a pressure fluid has been used. The present applicant has proposed a fluid pressure cylinder, as disclosed in Japanese Laid-Open Patent Publication No. 2008-133920, which is closed on both ends by a head cover and a rod cover, and in which the head cover and the rod cover are tightly fastened together with the cylinder tube by four connecting rods.
With this type of fluid pressure cylinder, a piston and a piston rod are disposed for displacement in the interior of the cylinder tube, and by supplying a pressure fluid into cylinder chambers that are formed between the piston and the cylinder tube, the piston is displaced along the axial directions.
A general object of the present invention is to provide a fluid pressure cylinder, which is capable of enhancing ease of assembly by easily and reliably carrying out positioning of the cylinder tube with respect to cover members.
The present invention is characterized by a fluid pressure cylinder comprising a tubular shaped cylinder tube including cylinder chambers defined in interior thereof, a cover member attached to an end of the cylinder tube, and a piston disposed displaceably along the cylinder chambers.
On an end surface of the cover member, a positioning member is provided that abuts against at least one of an inner wall surface or an outer wall surface of the cylinder tube, and positions the cylinder tube coaxially with respect to the cover member.
According to the present invention, on an end surface of the cover member of the fluid pressure cylinder, the positioning member is provided so as to abut against at least one of an inner wall surface or an outer wall surface of the cylinder tube, and position the cylinder tube coaxially with respect to the cover member. Thus, when the cylinder tube is assembled with respect to the cover member, by assembling the cylinder tube such that at least one of the inner wall surface and the outer wall surface thereof is made to abut against the positioning member, the cylinder tube can easily and reliably be positioned coaxially at a predetermined position with respect to the cover member. As a result, in the fluid pressure cylinder, it is possible to enhance ease of assembly of the cover member and the cylinder tube.
The above and other objects, features and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, in which a preferred embodiment of the present invention is shown by way of illustrative example.
As shown in
The cylinder tube 12, for example, is constituted from a cylindrical body that is formed from a metal material, and extends with a constant cross-sectional area along the axial direction (the directions of arrows A and B), and in the interior thereof there is provided a piston unit 18 that divides the interior into cylinder chambers 22a, 22b. Further, on both ends of the cylinder tube 12, ring shaped seal members (not shown) are installed respectively through annular grooves.
As shown in
Further, as shown in
A first port member 30 from which the pressure fluid is supplied and discharged is provided on an outer wall surface 14a of the head cover 14, to which a pressure fluid supply source is connected through a non-illustrated pipe. The first port member 30, for example, is constituted from a block body, which is formed from a metal material, and is fixed by welding or the like.
Further, in the interior of the first port member 30, a port passage 32, which is formed with an L-shape in cross-section, is formed, and an opening thereof is fixed with respect to the outer wall surface 14a of the head cover 14 in a state of being opened in a direction perpendicular to the axial direction of the cylinder tube 12.
In addition, by the port passage 32 of the first port member 30 communicating with the first communication hole 28 of the head cover 14, the first port member 30 and the interior of the cylinder tube 12 are placed in communication.
Instead of providing the first port member 30, for example, a pipe connection fitting may be connected directly with respect to the first communication hole 28.
On the other hand, on an inner wall surface 14b of the head cover 14 formed on a side of the cylinder tube 12 (in the direction of the arrow A), as shown in
The first spigot pins 36 are disposed in a plurality (three) so as to be of the same number as the first pin holes 34, and are made up from flange members 38 formed with circular shapes in cross section, and shaft members 40 of a smaller diameter than the flange members 38 which are inserted into the first pin holes 34. In addition, by press-fitting of the shaft members 40 of the first spigot pins 36 into the first pin holes 34, the first spigot pins 36 are fixed, respectively, to the inner wall surface 14b of the head cover 14, and the flange members 38 thereof are in a state of projecting out with respect to the inner wall surface 14b of the head cover 14.
Further, when the cylinder tube 12 is assembled with respect to the head cover 14, as shown in
Stated otherwise, the first spigot pins 36 are arranged on a circumference having a predetermined diameter so that the outer circumferential surfaces thereof internally contact or inscribe the inner circumferential surface of the cylinder tube 12.
A ring shaped first damper 42 is disposed on the inner wall surface 14b of the head cover 14. The first damper 42, for example as shown in
Further, in the first damper 42, plural cutaway sections 44 are included, which are recessed with substantially circular shapes in cross section radially inward from the outer circumferential surface of the first damper 42, and the first spigot pins 36 are inserted through the cutaway sections 44. More specifically, the cutaway sections 44 are provided in the same number, at the same pitch, and on the same circumference as the first spigot pins 36. In addition, as shown in
More specifically, at the same time as functioning as positioning means (spigot means) for positioning the one end of the cylinder tube 12 at a predetermined position with respect to the head cover 14, the first spigot pins 36 also function as fixing means for fixing the first damper 42 to the head cover 14.
In addition, when the piston unit 18 is displaced to the side of the head cover 14 (in the direction of the arrow B), by the end thereof coming into abutment against the first damper 42, direct contact between the piston unit 18 and the head cover 14 is avoided, and the occurrence of shocks and impact noises accompanying such contact is suitably prevented.
Further, a first rod hole 46 in which a later-described guide rod 124 is supported is formed in the head cover 14 at a position located further toward the central side with respect to the first communication hole 28. The first rod hole 46 opens toward the side of the inner wall surface 14b of the head cover 14 (in the direction of the arrow A) and does not penetrate through to the outer wall surface 14a.
As shown in
A rod hole 48 is formed to penetrate in an axial direction (the directions of arrows A and B) through the center of the rod cover 16, and four second holes 50 through which the later-described connecting rods 88 are inserted are formed in the four corners of the rod cover 16. Further, a second communication hole 52 is formed in the rod cover 16 at a position located on the central side with respect to the second holes 50. The rod hole 48, the second holes 50, and the second communication hole 52 are formed to penetrate respectively in the thickness direction (the directions of arrows A and B) through the rod cover 16.
A holder 54 that displaceably supports the piston rod 20 is provided in the rod hole 48. As shown in
In addition, in a state in which the holder main body 56 is inserted through the rod hole 48 of the rod cover 16, and the flange member 58 is arranged on the side of the cylinder tube 12 (in the direction of the arrow B), the flange member 58 abuts against an inner wall surface 16b of the rod cover 16, and a plurality of (for example, four) first rivets 60 are inserted into and made to engage with first rivet holes 64 of the rod cover 16 via first through holes 62 of the flange member 58. As a result, the holder 54 is fixed with respect to the rod hole 48 of the rod cover 16. At this time, the holder 54 is fixed coaxially with the rod hole 48.
The first rivets 60, for example, are self-drilling or self-piercing rivets each having a circular flange member 66 and a shaft-shaped pin member 68, which is reduced in diameter with respect to the flange member 66. In a state with the first rivets 60 being inserted into the first through holes 62 from the side of the flange member 58, and the flange members 66 thereof engaging with the flange member 58, by punching the pin members 68 into the first rivet holes 64 of the rod cover 16, the pin members 68 are engaged with respect to the first through holes 62, and the flange member 58 is fixed with respect to the rod cover 16.
The first rivets 60 are not limited to being self-drilling rivets, and for example, may be general rivets that are fixed by having the pin members 68 thereof crushed and deformed after having been pushed out to the side of an outer wall surface 16a of the rod cover 16.
A bush 70 and a rod packing 72 are disposed alongside one another in the axial direction (the directions of arrows A and B) in the interior of the holder 54, and by the later-described piston rod 20 being inserted through the interior portion thereof, simultaneously with the piston rod 20 being guided along the axial direction by the bush 70, the rod packing 72 slides in contact therewith, whereby leakage of pressure fluid through a gap between the holder 54 and the rod packing 72 is prevented.
As shown in
Further, in the interior of the second port member 74, a port passage 76, which is formed with an L-shape in cross-section, is formed, and an opening thereof is fixed with respect to the outer wall surface 16a of the rod cover 16 in a state of being opened in a direction perpendicular to the axial direction of the cylinder tube 12.
In addition, by the port passage 76 of the second port member 74 communicating with the second communication hole 52 of the rod cover 16, the second port member 74 and the interior of the cylinder tube 12 are placed in communication. Instead of providing the second port member 74, for example, a pipe connection fitting may be connected directly with respect to the second communication hole 52.
On the other hand, on the inner wall surface 16b of the rod cover 16 that is formed on a side of the cylinder tube 12 (in the direction of the arrow B), as shown in
The second pin holes 78 are formed on a circumference having a predetermined diameter with respect to the center of the rod cover 16, and are separated by equal intervals mutually along the circumferential direction. The second spigot pins 80 are formed in the same shape as the first spigot pins 36, and therefore, detailed description thereof is omitted.
In addition, by insertion of the shaft members 40 of the second spigot pins 80 into the second pin holes 78, the second spigot pins 80 are fixed, respectively, to the inner wall surface 16b of the rod cover 16, and the flange members 38 thereof are in a state of projecting out with respect to the inner wall surface 16b of the rod cover 16.
Further, when the cylinder tube 12 is assembled with respect to the rod cover 16, as shown in
Stated otherwise, the second spigot pins 80 are arranged on a circumference having a predetermined diameter so that the outer circumferential surfaces thereof internally contact or inscribe the inner circumferential surface of the cylinder tube 12.
A ring shaped second damper 82 is disposed on the inner wall surface 16b of the rod cover 16. The second damper 82, for example as shown in
Further, in the second damper 82, plural cutaway sections 84 are included, which are recessed with substantially circular shapes in cross section radially outward from the outer circumferential surface of the second damper 82, and the second spigot pins 80 are inserted through the cutaway sections 84. In addition, by the second damper 82 being sandwiched between the inner wall surface 16b of the rod cover 16 and the flange members 38 of the second spigot pins 80, the second damper 82 is retained in a state of projecting out at a predetermined height with respect to the inner wall surface 16b.
More specifically, the cutaway sections 84 are provided in the same number, at the same pitch, and on the same circumference as the second spigot pins 80.
In this manner, at the same time as functioning as positioning means (spigot means) for positioning the other end of the cylinder tube 12 at a predetermined position with respect to the rod cover 16, the second spigot pins 80 also function as fixing means for fixing the second damper 82 to the rod cover 16.
In addition, when the piston unit 18 is displaced to the side of the rod cover 16 (in the direction of the arrow A), by the end thereof coming into abutment against the second damper 82, direct contact between the piston unit 18 and the rod cover 16 is avoided, and the occurrence of shocks and impact noises accompanying such contact is suitably prevented.
Further, a second rod hole 86 in which the later-described guide rod 124 is supported is formed at a position located further toward the central side of the rod cover 16 with respect to the second communication hole 52. As shown in
In addition, in a state in which the one end of the cylinder tube 12 is placed in abutment against the inner wall surface 14b of the head cover 14 and the other end thereof is placed in abutment against the inner wall surface 16b of the rod cover 16, the connecting rods 88 are inserted respectively through the four first and second holes 26, 50, and fastening nuts 90 (see
Further, as shown in
The detecting sensors 92 are magnetic sensors that are capable of detecting magnetism possessed by magnets 122 of a later-described ring body 100. The sensor retaining bodies 94 including the detecting sensors 92 are selectively provided at a quantity as needed.
As shown in
The plate body 98, for example, is formed with a substantially constant thickness from a metal plate member having elasticity, and a plurality of (for example, four) second through holes 102 that penetrate therethrough in the thickness direction are disposed in a central portion of the plate body 98. In addition, second rivets 104 are inserted into the second through holes 102, and by distal ends thereof being inserted into and engaged with second rivet holes 106 that are formed in the one end of the piston rod 20, the plate body 98 is connected substantially perpendicular to the one end of the piston rod 20.
The second rivets 104, for example, similar to the first rivets 60, are self-drilling rivets. After the second rivets 104 are inserted such that the flange members 66 thereof are placed on the side of the head cover 14 (in the direction of the arrow B) of the plate body 98, by punching the pin members 68 into the interior of the piston rod 20, the pin members 68 are engaged with respect to the second rivet holes 106, and the plate body 98 is fixed in engagement with respect to the piston rod 20.
Further, on an outer edge portion of the plate body 98, a plurality of (for example, four) third through holes 108 are provided that penetrate in the thickness direction. The third through holes 108 are formed at equal intervals mutually along the circumferential direction of the plate body 98, together with being formed on the same diameter with respect to the center of the plate body 98.
Furthermore, on the plate body 98, at a position more on an inner circumferential side than the third through holes 108, a rod insertion hole 110 is formed that penetrates in the thickness direction, and through which the later-described guide rod 124 is inserted.
Further still, on the plate body 98, at a position between the outer edge portion and the center portion that is fixed to the piston rod 20, for example, a rib 112 is included which has a curved shape in cross section. The rib 112 is formed in an annular shape along the circumferential direction, and is formed so as to project out toward an opposite side (in the direction of the arrow B) from the side of the piston rod 20. Further, the rib 112 may be formed to project out toward the side of the piston rod 20 (in the direction of the arrow A). Moreover, the rib 112 is formed at a position more on the inner circumferential side than the rod insertion hole 110.
The plate body 98 is not limited to the case of being connected to the end of the piston rod 20 by the second rivets 104, and for example, the plate body 98 may be connected to the end of the piston rod 20 by caulking or welding, may be connected thereto by press-contact and adhesion, or may be connected by screw-insertion. Furthermore, the plate body 98 may be connected by press-fitting of a pin into the end of the piston rod 20 and plastic deformation of the end of the pin.
The ring body 100, for example, is formed with a circular shape in cross section from a metal material, and the outer edge portion of the plate body 98 is placed in abutment against an edge portion thereof on the side of the head cover 14 (in the direction of the arrow B), and is fixed thereto by a plurality of third rivets 114. The third rivets 114, for example, similar to the first and second rivets 60, 104, are self-drilling rivets. After the third rivets 114 are inserted such that the flange members 66 thereof are placed on the side of the head cover 14 (in the direction of the arrow B) of the plate body 98, by punching the pin members 68 into third rivet holes 115 of the ring body 100, the pin members 68 are engaged and latched in the interior thereof.
Further, as shown in
Furthermore, as shown in
As shown in
Further, an O-ring is disposed in the rod insertion hole 110, whereby leakage of pressure fluid through a gap between the guide rod 124 and the rod insertion hole 110 is prevented.
As shown in
The fluid pressure cylinder 10 according to the first embodiment of the present invention is constructed basically as described above. Next, operations and advantageous effects of the fluid pressure cylinder 10 will be described. A condition in which the piston unit 18 is displaced to the side of the head cover 14 (in the direction of the arrow B) will be described as an initial position.
At first, a pressure fluid is supplied to the first port member 30 from a non-illustrated pressure fluid supply source. In this case, the second port member 74 is placed in a state of being open to atmosphere under a switching operation of a non-illustrated switching valve. Consequently, the pressure fluid is supplied from the first port member 30 to the port passage 32 and the first communication hole 28, and by the pressure fluid that is supplied into the cylinder chamber 22a from the first communication hole 28, the piston unit 18 is pressed toward the side of the rod cover 16 (in the direction of the arrow A). In addition, the piston rod 20 is displaced while being guided in the holder 54 together with the piston unit 18, and by the end surface of the ring body 100 coming into abutment against the second damper 82, a displacement terminal end position is reached.
On the other hand, in the case that the piston unit 18 is to be displaced in the opposite direction (in the direction of the arrow B), together with the pressure fluid being supplied to the second port member 74, the first port member 30 is placed in a state of being open to atmosphere under a switching operation of the switching valve (not shown). In addition, the pressure fluid is supplied from the second port member 74 to the cylinder chamber 22b through the port passage 76 and the second communication hole 52, and by the pressure fluid that is supplied into the cylinder chamber 22b, the piston unit 18 is pressed toward the side of the head cover 14 (in the direction of the arrow B).
In addition, the piston rod 20 is displaced while being guided in the holder 54 under the displacement action of the piston unit 18, and the initial position is restored by the ring body 100 of the piston unit 18 coming into abutment against the first damper 42 of the head cover 14.
Further, when the piston unit 18 is displaced along the cylinder tube 12 in the axial direction (the directions of arrows A and B) in the manner described above, by being displaced along the guide rod 124 that is inserted through the interior of the piston unit 18, rotational displacement thereof does not take place. Therefore, the magnets 122 that are provided in the piston unit 18 are kept in positions facing toward the detecting sensors 92, and the displacement of the piston unit 18 can reliably be detected by the detecting sensors 92.
As described above, according to the first embodiment, in the head cover 14 and the rod cover 16 of the fluid pressure cylinder 10, respective pluralities of first and second spigot pins 36, 80 are disposed on the inner wall surfaces 14b, 16b that face toward the cylinder tube 12. The flange members 38 of the first and second spigot pins 36, 80 project out from the inner wall surfaces 14b, 16b, and the flange members 38 are disposed on circumferences of a predetermined diameter that internally contact or inscribe the inner circumferential surface of the cylinder tube 12. Consequently, when the cylinder tube 12 is assembled with respect to the head cover 14 and the rod cover 16, by insertion of the inner circumferential surfaces on the ends of the cylinder tube 12 so as to contact the flange members 38 of the first and second spigot pins 36, 80, the cylinder tube 12 can easily and reliably be positioned coaxially with the centers of the head cover 14 and the rod cover 16.
As a result, in the fluid pressure cylinder 10, it is possible to enhance ease of assembly of the head cover 14 and the rod cover 16 together with the cylinder tube 12.
Further, because the first and second spigot pins 36, 80 also function as fixing means for fixing the first and second dampers 42, 82 respectively onto the head cover 14 and the rod cover 16, there is no need to provide fixing bolts or the like separately from the first and second spigot pins 36, 80, and the number of parts in the fluid pressure cylinder 10 can be reduced together with enabling a reduction in the number of assembly steps therefor.
On the other hand, with a fluid pressure cylinder 130 according to a first modification as shown in
In addition, by taking out the spigot pins 134 that are installed in the first holes 136 and installing them instead in the second holes 138, it is possible for a cylinder tube 12a (the two-dot-dashed line shape shown in
Moreover, the spigot pins 134 are easily attached and detached by being constituted to be screw-engaged with respect to the first and second holes 136, 138.
Further, in the case of a fluid pressure cylinder 140 according to a second modification in which, for example, the cylinder tube does not have a circular cross-sectional shape, but rather, as shown in
In addition, when one end of the cylinder tube 142 is assembled with respect to the rod cover 144, the first semicircular section 150 is inserted over the outer side of the two spigot pins 146a, whereas the second semicircular section 152 is inserted over the outer side of the remaining one spigot pin 146b. Consequently, the spigot pins 146a, 146b internally contact or inscribe the inner circumferential surfaces of the first and second semicircular sections 150, 152, respectively, and are assembled in a state of being positioned coaxially with the rod hole 48 of the rod cover 144.
More specifically, with the fluid pressure cylinder 140, the three spigot pins 146a, 146b are provided, which are arranged corresponding to the cross-sectional oblong shape of the cylinder tube 142, and by assembling the first and second semicircular sections 150, 152 of the cylinder tube 142 so as to be inscribed by the spigot pins 146a, 146b, it is possible for the cylinder tube 142 to be positioned easily and reliably with respect to the rod cover 144.
Further, in the case of a twin-cylinder type of fluid pressure cylinder 160 according to a third modification as shown in
Furthermore, between the rod holes 166a, 166b and the spigot pins 164a, 164b, communication holes 168a, 168b for supplying a pressure fluid into the interiors of the cylinder tubes 162a, 162b are formed respectively, and communicate with the second port member 74 (see
Additionally, non-illustrated pistons are disposed displaceably in the interiors of the pair of cylinder tubes 162a, 162b, and are displaced along the axial directions by the pressure fluid, which is supplied to the communication holes 168a, 168b from the second port member 74.
With the above-described fluid pressure cylinder 160, when the ends of the cylinder tubes 162a, 162b are assembled with respect to the rod cover 165, the cylinder tubes 162a, 162b are inserted over the outer sides of the three spigot pins 164a, 164b, and by the spigot pins 164a, 164b abutting against the inner circumferential surfaces thereof, the cylinder tubes 162a, 162b are assembled and positioned, respectively, easily and reliably in a coaxial manner with the pair of rod holes 166a, 166b in the rod cover 165.
Furthermore, in the case of a fluid pressure cylinder 170 having a cylinder tube 172 having a rectangular shape in cross section according to a fourth modification as shown in
In the respective modified examples described above, although descriptions have been made for cases in which the cylinder tubes 12, 142, 162a, 162b, and 172 are positioned and assembled with respect to the rod covers 132, 144, 165, and 176, a similar situation applies to the case of being assembled with respect to the head cover 14.
Next, a fluid pressure cylinder 180 according to a second embodiment will be described with reference to
As shown in
In addition, with the fluid pressure cylinder 180, the pressure fluid from a first port 192 of the head cover 188 is supplied to the cylinder chamber 22a, whereby the piston 182 is displaced toward the side of the rod cover 184 (in the direction of the arrow A) in opposition to the elastic force of the spring 186. On the other hand, by stopping supply of the pressure fluid to the first port 192 and placing the first port 192 in a condition of being open to atmosphere, the piston 182 is displaced toward the side of the head cover 188 (in the direction of the arrow B) by the elastic force of the spring 186. Moreover, at this time, the pressure fluid may also be supplied to a second port 194 of the rod cover 184.
Even with the single-acting fluid pressure cylinder 180 of this type, by assembling the cylinder tube 12 using the spigot pins 190, which are disposed on inner wall surfaces of the head cover 188 and the rod cover 184, it is possible to position and assemble the cylinder tube 12 easily and reliably on the same axis with respect to the head cover 188 and the rod cover 184. Further, it should be noted that the spring 186 may be arranged on the side of the head cover 188.
Next, a fluid pressure cylinder 200 according to a third embodiment will be described with reference to
As shown in
The spigot pins 190 penetrate through the base plate 202, such that both end portions thereof project out respectively on the side of the cylinder tube 208a, and on the side of the cylinder tube 208b.
In addition, with the fluid pressure cylinder 200, from a port 210 of the base plate 202, the pressure fluid is supplied respectively to the cylinder chambers 22a, 22b of the cylinder tubes 208a, 208b, whereby the two pistons 204a, 204b in pairs are displaced respectively in directions away from the base plate 202.
Even with the dual rod fluid pressure cylinder 200 of this type, by assembling the cylinder tubes 208a, 208b using the spigot pins 190, which are disposed on both side surfaces of the base plate 202, it is possible to position and assemble the cylinder tubes 208a, 208b easily and reliably with respect to the base plate 202.
Further, because the spigot pins 190 for positioning the one cylinder tube 208a, and the spigot pins 190 for positioning the other cylinder tube 208b are used in common, compared to the case of providing spigot pins separately and respectively, the number of parts in the fluid pressure cylinder 200 can be reduced, together with enabling a reduction in the number of assembly steps.
Next, a fluid pressure cylinder 220 according to a fourth embodiment will be described with reference to
As shown in
On the head cover 222, there are included the first port 224, which opens in the center of an outer wall surface 222a thereof, and the second port 226, which opens in the vicinity of an outer edge portion of the outer wall surface 222a. The first and second ports 224, 226 are formed substantially in parallel and penetrate in the thickness direction of the head cover 222.
Stated otherwise, the first and second ports 224, 226 are formed along the axial direction (the directions of arrows A and B) of the fluid pressure cylinder 220.
Further, plural first spigot pins 232 for positioning the first cylinder tube 228, together with plural second spigot pins 234 for positioning the second cylinder tube 230, which covers the outer circumferential side of the first cylinder tube 228, are provided on an inner wall surface 222b of the head cover 222.
On the other hand, on the inner circumferential surface of a rod cover 236, third spigot pins 238 are provided on a circumference having the same diameter as the first spigot pins 232 on the head cover 222, and fourth spigot pins 240 are provided on a circumference having the same diameter as the second spigot pins 234 on the head cover 222.
In addition, by insertion of both ends of the first cylinder tube 228 respectively over the first spigot pins 232 of the head cover 222 and the third spigot pins 238 of the rod cover 236, the first and third spigot pins 232, 238 are positioned so as to internally contact or inscribe the inner circumferential surface of the first cylinder tube 228.
Further, by insertion of both ends of the second cylinder tube 230 respectively over the second spigot pins 234 of the head cover 222 and the fourth spigot pins 240 of the rod cover 236, the second and fourth spigot pins 234, 240 are positioned so as to internally contact or inscribe the inner circumferential surface of the second cylinder tube 230.
Consequently, the first cylinder tube 228 is positioned coaxially with respect to the inner wall surfaces of the head cover 222 and the rod cover 236, and on the outer side of the first cylinder tube 228, the second cylinder tube 230 is positioned coaxially with respect to the inner wall surfaces of the head cover 222 and the rod cover 236.
In addition, in the fluid pressure cylinder 220, by supplying the pressure fluid from the first port 224 to the interior of the first cylinder tube 228, the piston 182 is displaced toward the side of the rod cover 236 (in the direction of the arrow A), whereas by supplying the pressure fluid between the second cylinder tube 230 and the first cylinder tube 228 from the second port 226, the pressure fluid is introduced through a communication port 242 (see
Even with the fluid pressure cylinder 220 as described above, in which supply and discharge of the pressure fluid can be carried out from the side of the head cover 222, by disposing the two types of spigot pins 232, 234, 238, 240 on circumferences, each having different circumferential diameters, with respect to the head cover 222 and the rod cover 236, it is possible to position and assemble the first and second cylinder tubes 228, 230, which differ in diameter, easily and reliably on the same axis.
Next, a fluid pressure cylinder 250 according to a fifth embodiment will be described with reference to
As shown in
As in the fluid pressure cylinder 250 described above, even in the case of providing the plural spigot pins 256 that contact the outer circumferential surface of the cylinder tube 12, it is possible to position and assemble the cylinder tube 12 easily and reliably on the same axis with respect to the head cover 252 and the rod cover 254.
Lastly, a fluid pressure cylinder 260 according to a sixth embodiment will be described with reference to
As shown in
On the head cover 266, as shown in
Both ends of the first cylinder tube 262 are arranged on inner sides of the first and second spigot pins 270, 272, and the outer circumferential surface thereof is positioned and retained coaxially by abutting against the first and second spigot pins 270, 272. On the other hand, the second cylinder tube 264 is arranged on the outer circumferential side of the first cylinder tube 262, with both ends thereof being arranged on outer sides of the first and second spigot pins 270, 272, and the inner circumferential surface thereof is positioned and retained coaxially by abutting against the first and second spigot pins 270, 272.
Consequently, the first cylinder tube 262 is positioned coaxially with respect to the head cover 266 and the rod cover 268, and further, the second cylinder tube 264 is positioned coaxially on the outer circumferential side of the first cylinder tube 262.
More specifically, the first and second spigot pins 270, 272 comprise both means for positioning the first cylinder tube 262 and means for positioning the second cylinder tube 264.
In the foregoing manner, in the fluid pressure cylinder 260 equipped with the pair of first and second cylinder tubes 262, 264, without providing two types of spigot pins respectively on the head cover 266 and the rod cover 268, since the pair of first and second cylinder tubes 262, 264 can be positioned and maintained by only one type of first and second spigot pins 270, 272, the number of parts in the fluid pressure cylinder 260 can be reduced, together with enabling a reduction in the number of assembly steps.
The fluid pressure cylinder according to the present invention is not limited to the above embodiments. It is a matter of course that various changes and modifications may be made to the embodiments without departing from the scope of the invention as set forth in the appended claims.
Number | Date | Country | Kind |
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2015-118182 | Jun 2015 | JP | national |
Filing Document | Filing Date | Country | Kind |
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PCT/JP2016/002635 | 6/1/2016 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2016/199373 | 12/15/2016 | WO | A |
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Number | Date | Country | |
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20180298926 A1 | Oct 2018 | US |