The present invention relates to a fuel feed system of an engine in which an auto fuel cock for controlling fuel feed from a fuel tank to the engine is operated by pressure pulsation of air in an engine case.
Additionally, the present invention relates to a fuel feed system of an engine in which an auto fuel cock is arranged between an engine case and a fuel tank fixed above the engine case, and in which an inside of the engine case is connected to the auto fuel cock via a negative pressure tube.
Disclosed in JP-A-2003-171910 is an apparatus in which an auto fuel cock for controlling fuel feed from a fuel tank to an engine is connected to a crank case of the engine via a feed tube, and the auto fuel cock is operated by pressure pulsation generated in the crank case.
Disclosed in JP-U-61-097577 is an apparatus in which a tip of a communicating tube extended from an auto fuel cock for controlling fuel feed from a fuel tank to an engine is opened in oil accumulating at a bottom part of a crank case, and the auto fuel cock is operated by pressure pulsation generated in the crank case.
Additionally, disclosed in JP-Y-59-013336 is a apparatus in which an suction part of a fuel cock is inserted into a discharge cylinder provided on a fuel tank via an oil seal constituted by an elastic material so that the fuel cock is attached to the bottom part of the fuel tank, and in which a cylindrical lock body constituted by an elastic body fitted onto the outer circumferences of the discharge cylinder and the suction part is tightened and fixed with a fixing instrument.
In an apparatus of JP-A-2003-171910, there is a possibility that a malfunction of an auto fuel cock is caused by accumulation of oil generated by condensation of oil mist which is generated in the crank case of the engine and infiltrates into the auto fuel cock through a feed tube.
Additionally, in an apparatus of JP-U-61-097577, since a tip of a communicating tube is opened in oil accumulating at the bottom part of a crank case, there is no possibility that oil mist infiltrates into the auto fuel cock through the communicating tube. However, there is a possibility that the oil in the crank case directly infiltrates into the auto fuel cock through the communicating tube when the engine is tilted.
On the other hand, when an auto fuel cock is arranged between an engine case and a fuel tank fixed above the engine case and the inside of the engine case is connected to the auto fuel cock via a negative pressure tube, there is a problem that work for connecting a lower end of the negative pressure tube to the inside of the engine case and for connecting an upper end of the negative pressure tube to the auto fuel cock is necessary and therefore much labor and time are required for the work. In particular, the above work becomes more difficult in a case where a working space between the fuel tank and the engine case is small. The distance between the engine case and the fuel tank increases when sufficient space is ensured, and thus there exists a problem the whole engine enlarges.
Additionally, it is conceived that a negative pressure introduction joint of the auto fuel cock fixed to a lower surface of the fuel tank to a negative pressure introduction joint of the engine case via an approximate crank-shaped is a bent negative pressure tube so that the whole engine is miniaturized by shortening the distance between the engine case and the fuel tank fixed above the engine case. However, this causes a possibility that oil which infiltrates from the engine case accumulates at a bent part of the negative pressure tube when the engine is tilted. When a tip of the negative pressure introduction joint of the auto fuel cock is soaked into the oil, there is a possibility that the operation of the auto fuel cock, of which the communication with the inside of the engine case is cut off, becomes impossible.
A first object of the present invention is to provide a fuel feed system of an engine for preventing a malfunction of an auto fuel cock caused by an infiltration of oil from an engine case.
A second object of the present invention is to provide a fuel feed system of an engine in which work for connecting an inside of an engine case to an auto fuel cock via an negative pressure tube is easy without increasing a distance between the engine case and a fuel tank.
A third object of the present invention is to provide a fuel feed system of an engine in which a negative pressure tube for connecting a negative pressure introduction joint of an auto fuel cock fixed to a lower surface of a fuel tank to the negative pressure introduction joint of an engine case is not blocked due to the oil.
In accordance with one or more embodiments of the present invention, a fuel feed system of an engine in which an auto fuel cock for controlling fuel feed from a fuel tank to the engine is operated by pressure pulsation of air in an engine case is provided with a gas-liquid separating unit for separating oil mist generated in the engine case from air. The auto fuel cock is operated by the pressure pulsation of the air from which the oil mist is separated by the gas-liquid separating unit.
The fuel feed system may include a breather passage for feeding the air from which the oil mist is separated by the gas-liquid separating unit to a breathing unit and makes the breather passage communicate with the auto fuel cock.
In the above fuel feed system, the breather passage may be arranged at an upper part of the engine case.
In the above fuel feed system, a first negative pressure introduction joint provided on the auto fuel cock may be connected to a second negative pressure introduction joint provided on the breather passage via the negative pressure tube.
In the above fuel feed system, the negative pressure tube may be monotonously tilted downward from the first negative pressure introduction joint to the second negative pressure introduction joint.
In accordance with one or more embodiments of the present invention, a fuel feed system of an engine is provided with: an engine case; a fuel tank fixed above an engine case; an auto fuel cock which is arranged between the engine case and the fuel tank and fixed to a lower surface of the fuel tank; and a negative pressure tube connecting an inside of the engine case to the auto fuel cock. The auto fuel cock has a first negative pressure introduction joint projected downward, the engine case has a second negative pressure introduction joint projected upward from an upper surface of the engine case. The negative pressure tube has a first connection part fitted onto the first negative pressure introduction joint and a second connection part fitted onto the second negative pressure introduction joint. The negative pressure tube is positioned so that the first connection part of the negative pressure tube, of which the second connection part is fitted onto the second negative pressure introduction joint, is located on a movement route of the first negative pressure introduction joint of the auto fuel cock when the fuel tank, to which the auto fuel cock is fixed, is moved downward to be fixed above the engine case.
In the fuel feed system, a positioning part for regulating an attachment posture of the negative pressure tube to the engine case may be provided between the negative pressure tube and the engine case.
In the above fuel feed system, the positioning part may have a recessed part provided on the negative pressure tube and a projection provided on the engine case. Alternatively, the positioning part may have a projection provided on the negative pressure tube and a recessed part provided on the engine case.
In the above fuel feed system, a taper part of which the outer diameter is reduced downward may be formed at a lower end of the first negative pressure introduction joint of the auto fuel cock.
In the above fuel feed system, the negative pressure tube may be monotonously tilted downward from the first negative pressure introduction joint to the second negative pressure introduction joint.
Further, a projection and a recessed part of the exemplary embodiment described below correspond to the positioning part of the present invention.
In the above fuel feed system, the negative pressure tube may have a middle part between the first connection part and the second connection part and be formed in an approximate crank shape, and the first negative pressure introduction joint may have a notch at the lower end thereof.
In the above fuel feed system, the notch of the first negative pressure introduction joint may be opened toward the middle part side of the negative pressure tube.
The above fuel feed system may include the gas-liquid separating unit for separating the oil mist generated in the engine case from the air and make the auto fuel cock operate by the pressure pulsation of the air from which the oil mist is separated by the gas-liquid separating unit.
The above fuel feed system may include the breather passage for feeding the air from which the oil mist is separated by the gas-liquid separating unit to the breathing unit and makes the breather passage communicate with the auto fuel cock.
In the above fuel feed system, the breather passage may be arranged at the upper part of the engine case.
According to one or more embodiments of the present invention, a fuel feed system is provided with the gas-liquid separating unit for separating oil mist generated in the engine case from air and the auto fuel cock is operated by pressure pulsation of the air from which the oil mist is separated by the gas-liquid separating unit. Thereby, infiltration of the oil mist into the auto fuel cock can be suppressed to the minimum and a malfunction of the auto fuel cock caused by accumulation of the oil can be prevented.
Additionally, a breather passage for feeding the air from which the oil mist is separated by the gas-liquid separating unit to a breathing unit is connected to the auto fuel cock. Thus, it is unnecessary to provide a specific passage for transmitting the pressure pulsation of the air in the engine case to the auto fuel cock.
Additionally, the breather passage is arranged at an upper part of the engine case. Thus, the oil mist, which has not been completely removed and infiltrates into the breather passage, can be suppressed to the minimum.
Additionally, a first negative pressure introduction joint provided on the auto fuel cock is connected to a second negative pressure introduction joint provided on the breather passage via the negative pressure tube. Thus, the degree of freedom of an attachment position of the auto fuel cock can be raised.
Additionally, the negative pressure tube is monotonously tilted downward from the first negative pressure introduction joint to the second negative pressure introduction joint. Thus, the oil in the negative pressure tube is discharged to the breather passage by gravity and can be more reliably prevented from infiltrating into the auto fuel cock.
According to one or more embodiments of the present invention, when the fuel tank, to which the auto fuel cock is fixed, is moved downward so as to be fixed above the engine case, the first negative pressure introduction joint of the auto fuel cock is automatically fitted into a first connection part of the negative pressure tube, of which a second connection part is previously fitted onto the second negative pressure introduction joint of the engine case. Thus, it becomes possible to simultaneously complete attachment of the fuel tank and attachment of the negative pressure tube, and work efficiency is greatly improved. Further, since it is unnecessary to provide a working space, where the first and second connection parts of the negative pressure tube are respectively fitted onto the first and second negative pressure introduction joints, between a lower surface of the fuel tank and an upper surface of the engine case, the fuel tank is made to approach the engine case as much as possible so that the whole engine can be miniaturized.
Additionally, the positioning part for regulating an attachment posture of the negative pressure tube to the engine case is provided between the negative pressure tube and the engine case. Thus, the first negative pressure introduction joint of the auto fuel cock can be easily fitted into the first connection part of the negative pressure tube.
Additionally, the positioning part is constituted by a recessed part provided on the negative pressure tube and a projection provided on the engine case. Alternatively, the positioning part is constituted by a projection provided on the negative pressure tube and a recessed part provided on the engine case. Thus, the attachment posture of the negative pressure tube to the engine case can be easily and reliably regulated by engaging the projection with the recessed part.
Additionally, a taper part, of which the outer diameter is reduced downward, is provided at a lower end of the first negative pressure introduction joint of the auto fuel cock. Thus, the first negative pressure introduction joint of the auto fuel cock can be easily fitted into the first connection part of the negative pressure tube when the fuel tank is moved downward so as to be fixed above the engine case.
Additionally, the negative pressure tube is monotonously tilted downward from the first negative pressure introduction joint to the second negative pressure introduction joint. Thus, the oil infiltrating into the negative pressure tube is discharged by gravity, and can be reliably prevented from infiltrating into the auto fuel cock.
Additionally, the negative pressure tube has a middle part between the first connection part and the second connection part and is formed in an approximate crank shape, and the first negative pressure introduction joint has a notch at the lower end thereof. Thus, even if the engine is tilted so that the first connection part side of the middle part of the negative pressure tube is lowered and even if the oil is accumulated at the corners of the middle part and the first connection part, the auto fuel cock can be made to operate without any trouble so long as the notch formed at the lower end of the first negative pressure introduction joint is not soaked into the oil. That is why communication of the inside of the engine case and the auto fuel cock is not cut off.
Additionally, the notch of the first negative pressure introduction joint is opened toward the middle part side of the negative pressure tube. Thus, the notch can be hardly soaked into the oil even if the oil is accumulated at the corners of the middle part and the first connection part of the negative pressure tube.
Additionally, the gas-liquid separating unit for separating the oil mist generated in the engine case from the air is provided, and the auto fuel cock is made to operate by the pressure pulsation of the air from which the oil mist is separated by the gas-liquid separating unit. Thus, the infiltration of the oil mist into the auto fuel cock is suppressed to the minimum, and the malfunction of the auto fuel cock caused by the accumulation of the oil can be prevented.
Additionally, the breather passage for feeding the air from which the oil mist is separated by the gas-liquid separating unit to the breathing unit is made to communicate with the auto fuel cock. Thus, it is unnecessary to provide the specific passage for transmitting the pressure pulsation of the air in the engine case to the auto fuel cock.
Additionally, the breather passage is arranged at the upper part of the engine case. Thus, the oil mist, which has not been completely removed and infiltrates into the breather passage, can be suppressed to the minimum.
Other aspects and advantages of the invention will be apparent from the following description and the appended claims.
Exemplary embodiments of the present invention will be described hereinafter with reference to the accompanying drawings.
As shown in
The fuel tank 21 is constituted in such a way that a lower edge of a tank upper 21a, an upper edge of a tank lower 21b and an upper edge of a tank holder 22 are combined as one unit by a caulking part 23. A tank stay 24 is fixed to four attachment bosses 11a projected on the engine case 11 with bolts 25, and outer circumference parts of four rubber bushes 26 are supported by an upper surface of the tank stay 24. A bolt 27 penetrating from below to above of the center of each rubber bush 26 penetrates the tank holder 22 and a reinforcing plate 28 to be engaged with a nut 29, and thus the fuel tank 21 is supported above the engine case 11 without vibration.
As shown in
As most clearly shown in
A ring-shaped diaphragm supporting member 39 is held between the diaphragm supporting part 31e of the first housing 31 and the diaphragm supporting part 32c of the second housing 32. An outer circumference part of a first diaphragm 40 is fixed between the diaphragm supporting part 31e of the first housing 31 and the diaphragm supporting member 39 via a sealing member 41. The outer circumference part of a second diaphragm 42 is fixed between the diaphragm supporting part 32c of the second housing 32 and the diaphragm supporting member 39 via a sealing member 43. The first and second diaphragms 40 and 42, a spacer block 44 held between the center parts of the first and second diaphragms 40 and 42 and a disc-shaped spring sheet 45 brought into contact with a rear surface of the second diaphragm 42 are fixed as one unit with a rivet 46 penetrating them.
A valve seat forming member 48 is fitted between the first negative pressure introduction joint 32a of the second housing 32 and the negative pressure chamber 32b via a spacer plate 47. A valve body 40a formed on the center part of the first diaphragm 40 is energized in a direction to which the valve body 40a formed at the center of the first diaphragm 40 is seated on the valve seat 31d of the first housing 31 seat 31d of the first housing 31 with a valve spring 49 arranged between the valve seat forming member 48 and the spring sheet 45. An end of a reed valve 50 capable of sitting down on a valve seat 48b facing a through hole 48a penetrating the center part of the valve seat forming member 48 and an end of a stopper 51 for regulating the movable range of the reed valve 50 by covering the outer side thereof are fixed to the valve seat forming member 48 with a bolt (not shown). A fine through hole 50a for making the first negative pressure introduction joint 32a communicate with the negative pressure chamber 32b is formed in the reed valve 50.
As clearly shown in
As clearly shown in
Next, the construction of a gas-liquid separating unit 61 of the engine E will be described with reference to
A pin part 14a of the crank shaft 14 of the engine E is connected to a piston 63 via a connecting rod 62. A journal part 14b of the crank shaft 14 is supported by the engine case 11 via a ball bearing 64. Another journal part 14c of the crank shaft 14 is supported by a bearing holder 66, which is fixed in the engine case 11 with six bolts 65, via a ball bearing 67. A covering member 68 is fixed to an opening 11k of the engine case 11 so as to cover a front surface of the bearing holder 66 with nine bolts 69, and an oil agitating chamber 70 is formed between the covering member 68 and the bearing holder 66.
Moreover, both ends of a first balancer shaft 73 (see
A rotor 77 is rotatably supported by a bottom part of the oil agitating chamber 70 via a rotor shaft 76. A driven gear 78 provided on the rotor shaft 76 is engaged with a driving gear 79 provided on the crank shaft 14 so that the rotor 77 is rotationally driven by the crank shaft 14. Additionally, a timing belt 81 wound around a driving sprocket 80 provided on the crank shaft 14 is connected to a driven sprocket (not shown) provided on the cylinder head 12.
As clearly shown in
The oil agitating chamber 70 is a region surrounded by the first to fourth ribs 66a to 66d of the bearing holder 66. A gas-liquid separating chamber 83 having a labyrinth 82 constituted by the fourth and fifth ribs 66d and 66e of the bearing holder 66 and the first and second ribs 68a and 68b of the cover member 68 is formed outside of the first to fourth ribs 66a to 66d. An upper part of the gas-liquid separating chamber 83 is made to communicate with the breathing unit 52 via the breather passage 11e (see
Next, action the fuel feed system of the exemplary embodiment of the present invention including the above constitution will be described.
In
Since the bearing holder 66 which includes the ball bearing 67 for supporting the crank shaft 14 is fixed so as to face the opening ilk of the engine case 11, and the gas-liquid separating chamber 83 is formed between the cover member 68 combined with the opening ilk and the bearing holder 66, the bearing holder 66 can be used as a part of a wall surface of the gas-liquid separating chamber 83. Therefore, the number of parts can be increased compared with a case where a part of the wall surface of the gas-liquid separating chamber 83 is constituted by a specific member, and miniaturization, lightening, simplification of the shape of the engine case 11 can be realized compared with a case where a part of the side wall of the gas-liquid separating chamber 83 is constituted by a partition wall integrally formed with the engine case 11.
In addition, since the labyrinth 82 is provided in the gas-liquid separating chamber 83, the oil mist included in the air in the engine case 11 can be effectively separated. In particular, the labyrinth 82 is constituted in such a way that the fourth and fifth ribs 66d and 66e projecting from the bearing holder 66 side are mutually overlapped with the first and second ribs 68a and 68b projected from the cover member 68 by the distance α (see
In
In
In
Moreover, the first and second diaphragms 40 and 42 are energized in a right direction (in
The combinations of the negative pressure tube 38 and the first and second negative pressure introduction joints 32a and 11b are performed in accordance with the following steps. That is, the tank stay 24 is previously assembled to the tank holder 22 of the fuel tank 21 via the rubber bushes 26, and the first fuel hose 35 is previously assembled to the auto fuel cock 30. On the other hand, the second connection part 38b of the negative pressure tube 38 is previously fitted onto the second negative pressure introduction joint 11b of the engine case 11. Here, the recessed part 38d on the bottom surface of the first connection part 38a of the negative pressure tube 38 is engaged with the projection 11c of the engine case 11 (see
Thus, it is possible to fit the negative pressure tube 38 onto the first and second negative pressure introduction joints 32a and 11b only by making the fuel tank 21 approach the engine case 11 from above, and assembly work of the negative pressure tube 38 is simplified. Additionally, since the recessed part 38d of the negative pressure tube 38 is engaged with the projection 11c of the engine case 11 and the negative pressure tube 38 is positioned, work for fitting the first negative pressure introduction joint 32a of the auto fuel cock 30 into the first connection part 38a of the negative pressure tube 38 becomes easy. In addition, the vertical movement of the negative pressure tube 38 once equipped is regulated, and the tube cannot be removed unless the fuel tank 21 is removed. Therefore, it is unnecessary to prevent pulling-off of the negative pressure tube 38 with a clip, etc.
If the assembly work of the negative pressure tube 38 is performed after the fuel tank 21 is fixed to the engine case 11, not only a working space, where the negative pressure tube 38 is bent to fit onto the first and second negative pressure introduction joints 32a and 11b, is needed, but also the negative pressure tube 38 itself is enlarged. Therefore, the fuel tank 21 cannot be arranged in the vicinity of the engine case 11, and the whole engine E is enlarged.
If the oil mist in the engine case 11 is accumulated inside of the negative pressure tube 38 or inside of the first negative pressure introduction joint 32a, the pressure pulsation in the breather passage 11e cannot be transmitted to the negative pressure chamber 32b of the auto fuel cock 30 and there is a possibility that a malfunction of the auto fuel cock 30 occurs. However, according to the present exemplary embodiment, the air, from which almost the oil caulking removed by the gas-liquid separating unit 61, is fed to the breather passage 11e, and the pressure pulsation in the breather passage 11e is introduced into the auto fuel cock 30. Therefore, the malfunction of the auto fuel cock 30 caused by the oil mist can be previously prevented.
In particular, since the breather passage 11e for feeding the air passed through the gas-liquid separating unit 61 to the breathing unit 52 is provided at an upper part of the engine case 11, infiltration of the oil mist into the breather passage 11e can be further effectively prevented. In addition, since the auto fuel cock 30 is made to operate with use of the pressure pulsation in the breather passage 11e, it is unnecessary to form the specific passage for transmitting the pressure pulsation to the auto fuel cock 30.
Additionally, the negative pressure tube 38 includes the first connection part 38a which vertically extends and is inserted into the first negative pressure introduction joint 32a, the second connection part 38b which vertically extends and is inserted into the second negative pressure introduction joint 11b, and the middle part 38c which obliquely extends downward from the lower end of the first connection part 38a to the upper end of the second connection part 38b. Therefore, even if the oil mist infiltrates into the negative pressure tube 38, the oil caulking discharged to the breather passage 11e by gravity without accumulating in the negative pressure tube 38, and a situation where the pressure pulsation is not transmitted to the auto fuel cock 30 can be previously avoided.
Further, since the taper part 32d is formed at the lower end of the first negative pressure introduction joint 32a of the auto fuel cock 30, insertion work of the first negative pressure introduction joint 32a into the first connection part 38a of the negative pressure tube 38 becomes easy. In addition, since the notch 32e is formed on the taper part 32d, the action of the notch 32e can prevent the first negative pressure introduction joint 32a from being closed even if the oil is accumulated on the lower end of the first connection part 38a as shown being circled by the chain line in
Even if the negative pressure introduction joint 32a is cut off at an upper end of the taper part 32d (upper end of the notch 32e), the same effect as a case where the notch 32e is provided can be obtained. However, since the taper part 32d is eliminated, such cut-off makes the insertion of the negative pressure tube 38 difficult.
Additionally, since the auto fuel cock 30 operates by the negative pressure of the engine case 11 which is stronger than intake negative pressure of the engine E, the sufficient negative pressure is generated only by cranking by the recoil starter 16 and the fuel can be fed to the carburetor 17. In particular, the auto fuel cock 30 can be reliably made to operate by employment of the first and second diaphragms 40 and 42 even if the negative pressure is small.
The exemplary embodiment of the present invention has been described above, various design modifications can be performed without departing from the substance of the present invention.
Although the exemplary embodiment regarding a general purpose engine E has been described, for example, the present invention can be applied to engines for arbitrary uses.
Additionally, although the recessed part 38d provided on the negative pressure tube 38 and the projection 11c provided on the engine case 11 have been exemplified as a positioning part in the exemplary embodiment, the positional relationship between the recessed part and the projection may be reversible, and any shapes of the recessed part and the projection are applicable.
It will be apparent to those skilled in the art that various modifications and variations can be made to the described preferred embodiments of the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover all modifications and variations of this invention consistent with the scope of the appended claims and their equivalents.
The present application claims priority based on Japanese Patent Application No. P2005-183601 filed on Jul. 23, 2005, Japanese Patent Application No. P2005-183602 filed on Jul. 23, 2005, and Japanese Patent Application No. P2005-183603, the contents of them are incorporated herein by reference.
The present invention is applicable to a fuel feed system of an engine in which an auto fuel cock for controlling fuel feed from a fuel tank to the engine is operated by pressure pulsation of air in an engine case.
Additionally, the present invention is applicable to a fuel feed system of an engine in which an auto fuel cock is arranged between an engine case and a fuel tank fixed above the engine case, and in which an inside of the engine case is connected to the auto fuel cock via a negative pressure tube.
Number | Date | Country | Kind |
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2005-183601 | Jun 2005 | JP | national |
2005-183602 | Jun 2005 | JP | national |
2005-183603 | Jun 2005 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2006/312447 | 6/21/2006 | WO | 00 | 12/21/2007 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2006/137458 | 12/28/2006 | WO | A |
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Number | Date | Country | |
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20100037868 A1 | Feb 2010 | US |