The present invention relates to a driving mechanism, particularly a driving mechanism applicable to an impact wrench.
Impact driver is a tool that provides high torque. A common impact driver has a driving shaft that can be driven, an impact bulk, an output shaft, balls and a resilient member. The driving shaft and the impact bulk both have guiding grooves. The impact bulk is sleeved on the driving shaft, and the ball is located in the guiding groove. The resilient member provides a tension between the driving shaft and the impact bulk. With the design of the shape of the guiding grooves of the driving shaft and the impact bulk, the movement of the ball in the guiding groove can make the rotating driving shaft cause the impact bulk to move in the axial direction and rotate at the same time. The surface of the impact bulk on which the output shaft abuts against has a plurality of protruding blocks, such that the rotating impact bulk will move backward automatically upon reaching a critical point and then the protruding blocks will abut against the output shaft. At that time, the resilient member is compressed and stores a greater tension. As the impact bulk continues rotating such that the surface on which the output shaft abuts against goes beyond the surface of the protruding block, the tension stored in the resilient member is exerted on the impact bulk instantaneously to provide it with a forward impulse. At that time, due to the limitation on the movement of the ball in the guiding groove, the impulse will be transferred to a torque applied to the impact bulk, which thereby causes the protruding block of the impact bulk to impact the output shaft in the circumferential direction so that the output shaft generates a instantaneous torque and achieve the objective of screwing in (tight) and out (loose) a screw.
However, forming the guiding grooves on the driving shaft and the impact bulk requires precise processing technique, which will increase not only processing time but also cost. In addition, since the guiding grooves are located on the driving shaft and the impact bulk, they each can only has one design for the shape the guiding groove and cannot easily change the shape of the guiding groove to meet different usage needs.
In some embodiments, the present disclosure provides a driving mechanism, which comprises a driving shaft, a sleeve, an impact bulk, a first guiding member and a second guiding member. The sleeve is sleeved on the driving shaft and has a first guiding groove and a second guiding groove. The impact bulk is sleeved on the sleeve. The first guiding member is movable in the first guiding groove and is configured to have no linear movement relative to the driving shaft. The second guiding member is movable in the second guiding groove and is configured to have no linear movement relative to the impact bulk. By means of the movement of the first guiding member in the first guiding groove and the movement of the second guiding member in the second guiding groove, the sleeve can move with respect to the driving shaft and the impact bulk in the axial direction.
In some embodiments, the present disclosure provides a driving mechanism, which comprises an input mechanism, a sleeve, an impact bulk and a resilient member. The sleeve is sleeved on the input mechanism. The impact bulk is sleeved on the sleeve. The resilient member is configured to apply a tension to the impact bulk relative to the input mechanism in the axial direction. By means of a force-torque transfer mechanism, the tension applied to the impact bulk is transferred to a torque applied to the output mechanism.
The above contents generally recite the technical features of the present disclosure so that the following detailed description of the present disclosure can be better understood. Other technical features constituting the subject matters of the claims of the present disclosure are recited in the following contents. A person with general knowledge in the field of the present disclosure can easily modify or design other structures or manufacturing processes by utilizing the concept or specific embodiment and thereby achieve the same objectives of the present disclosure. A person with general knowledge in the field of the present disclosure should understand an equivalent structure cannot escape the spirit and scope as defined in the claims.
The configurations of the present disclosure can be better understood according to the following embodiments when reading the present disclosure with the accompanying drawings. It should be noted that the features may have been depicted without reflecting the proportions and the size of the features may have been enlarged or narrowed in order to clearly describe the contents of the present disclosure.
In the drawings and embodiments of the present disclosure, same or similar elements are denoted by same reference numeral.
In some embodiments, the driving mechanism 1 mainly comprises a driving shaft 11, a sleeve 12, an impact bulk 13 (depicted with broken lines in
In some embodiments, the driving mechanism 11 has a proximal end 111 close to the user and an distal end 112 far from the user. In some embodiments, the driving shaft 11 has an annular protruding portion 113 at the proximal end 111 thereof. In some embodiments, the sleeve 12 is sleeved on the driving shaft 11 from the distal end 112 of the driving shaft 11; the impact bulk 13 is sleeved on the outer peripheral wall of the sleeve 12. In some embodiments, the impact bulk 13 is roughly a hollow cylindrical body and has an annular groove 134 with an U-shaped cross-section; the annular gasket 18 and a plurality of rolling members 17 are accommodated in the annular groove 134. In some embodiments, the output shaft 14 is an output mechanism which has a notch at one end thereof, the notch can be sleeved on a portion of the distal end 112 of the driving shaft 11 and thereby abuts against the distal end 112 of the driving shaft 11. In some embodiments, the output shaft 14 abuts against the outer side wall 121 of the sleeve 12 in the longitudinal direction. In some embodiments, the resilient member 15 is sleeved on the driving shaft 11. In some embodiments, one end of the resilient member 15 abuts against the annular protruding portion 113 of the driving shaft 11 and the other end of the resilient member 15 abuts against the annular gasket 18 of the impact bulk 13. When the resilient member 15 is compressed, it applies a tension between the driving shaft 11 and the impact bulk 13.
As shown in
As shown in
In some embodiments, the inner peripheral wall of the impact bulk 13 also has recesses 131 for the disposition of the guiding member 16. In some embodiments, the recesses 131 are roughly located on the opposing sides of the inner peripheral wall of the impact bulk 13 in the radial direction. In some embodiments, the guiding member 16 is a ball (e.g., steel ball) which can be partially accommodated in the recess 131 of the impact bulk 13 and partially protrudes from the inner peripheral wall of the impact bulk 13.
In some embodiments, a plurality of rolling members 17 (e.g., balls) are disposed between the annular gasket 18 and the annular groove 134 of the impact bulk 13. In some embodiments, the plurality of rolling members 17 are preferably twenty eight balls. Referring to
In some embodiments, the tension of the resilient member 15 is transmitted to the impact bulk 13 via the annular gasket 18 and the rolling members 17. The disposition of the rolling members 17 can allow the friction between the rotating impact bulk 13 and the annular gasket 18 to decrease to a minimum.
In some embodiments, the sleeve 12 has the shape of a hollow cylinder and a plurality of guiding grooves 122 for the guiding members 16 to move therein. Referring to
Referring to
Referring to
Referring to
According to the above, the transmission of the force and torque between the driving shaft 11 and the impact bulk 13 is achieved by means of the sleeve 12 and the guiding members 16. Specifically, because the guiding member 16 disposed on the driving shaft 11 has no linear movement relative to the driving shaft 11 and because the guiding member 16 disposed on the impact bulk 13 has no linear movement relative to the impact bulk 13, the movement of the driving shaft 11 and the impact bulk 13 can be controlled by means of the movement of the guiding members 16 in the guiding grooves 122 of the sleeve 12, so that the objective of transmitting force and energy can be achieved. In addition, referring to
In some embodiments, the driving shaft of the driving mechanism 11 is an input mechanism which provides an input end and rotates by the power provided by a motor. In an embodiment, the impact bulk 13 roughly has the shape of a hollow cylinder and has an annular recessed face 132 at one end. In an embodiment, the output shaft 14 abuts against the annular recessed face 132 of the impact bulk 13. Referring to
Referring to
The force-torque transfer mechanism of the present disclosure is elaborated in the following. In the above-mentioned process, the driving shaft 11 transmits rotational kinetic energy to the sleeve 12 via the guiding members 16 disposed thereon. The movement trajectory of the guiding member 16 can be constrained by means of the design of the V-shaped guiding groove 122, such that the sleeve moves in the axial direction and rotates simultaneously. The movement of the sleeve 12 further transmits the kinetic energy to the guiding members 16 disposed on the impact bulk 13 and thereby causes the impact bulk 13 to move in the axial direction and rotate. At the instant the tension of the resilient member 15 pushes the impact bulk 13 forward to cause the protruding block 141 of the output shaft 14 to return to the annular recessed face 132 of the impact bulk 13, the guiding member 16 corresponding to the impact bulk 13 can transfer the axial tension exerted on the impact bulk 13 to a torque due to the design of the shape of the guiding grooves 16 of the sleeve 12, such torque causes the side face of the protruding blocks to impact the side face of the protruding block 141 of the output shaft 14 and thereby transmits the torque to the output shaft 14. The entire movement process mentioned above repeats as the driving shaft 11 rotates constantly, such that in the process where the driving shaft 14 works (e.g., screwing a screw in or out), it applies an impact torque to the screw repetitively and thereby achieves a labor-saving effect
Following further describes the detailed movement of the guiding grooves 122 of the sleeve 12 and the guiding members 16 in the operation of the driving mechanism 1 of the present invention. The exemplary view of the driving mechanism 1 in the middle of
With reference to the exemplary views of the driving mechanism 1 in the middle and on the top of
When the impact bulk 13 moves backward, the protruding block 141 of the output shaft 14 will move from the annular recessed face 132 of the impact bulk 13 to the outer surface of the protruding blocks 133 and causes the resilient member 15 to generate a tension that pushes the impact bulk 13 toward the output shaft 14. When the impact bulk 13 rotates further such that the protruding block 133 rotates over the protruding block 141 of the output shaft 14 in the circumferential direction, the tension of the resilient member 15 pushes the impact bulk 13 toward the output shaft 14 so that the impact bulk 13 moves forward and causes the protruding block 141 of the output shaft 14 return to the annular recessed face 132 of the impact bulk 13. When the impact bulk 13 is pushed forward by the tension of the resilient member 15, the guiding members 16 disposed thereon cause the impact bulk 13 to rotate at the same time due to the design of the guiding grooves 122, such that the tension in the axial direction is transferred to a torque applied to the impact bulk 13. The protruding blocks 133 of the rotating impact bulk 13 further impact the protruding block 141 of the output shaft 14 to transfer the torque to the output shaft 14.
In comparison to the guiding groove formed on the outer peripheral wall of the driving shaft 11 and the inner peripheral wall of the impact bulk 13, the sleeve 12 having the guiding groove 122 in the present invention can reduce the resistance to the movement of the guiding members 16 and can enhance the efficiency of transmission of kinetic energy (i.e., the power consumption of the tool used can be saved). In addition, because the guiding grooves 122 of the present invention are formed on the sleeve 12, high-precision manufacturing process of forming guiding grooves on the outer peripheral wall of the driving shaft 11 and the inner peripheral wall of the impact bulk 13 can be avoided. Also, the present invention can satisfy different usage demands by replacing sleeves 12 with different design of guiding grooves 122. Furthermore, the sleeve 12 of the present invention can increase the times (frequency) the impact bulk 13 impacts the output shaft 14 and reduce the operation travel of the driving mechanism 1.
The terminologies “approximately,” “substantially,” “basically” and “about” recited in the context are used to describe a small change. They may refer to the exact situation of an event or condition or very similar situation of an event or condition when used with events or conditions.
Singular term “a/an” and “the” recited in the context may include a plurality of article designated unless otherwise is clearly defined. In some description of embodiments, an assembly disposed “on” or “above” another assembly may cover the situation where the former assembly is directly located on (e.g., physically contact) the latter assembly and the situation where one or more interfering assemblies are located between the former assembly and the latter assembly.
Though the present disclosure is described and elaborated with reference to the particular embodiments, these descriptions and explanations do not form a limitation on the present disclosure. A person familiar with the technique of the present disclosure can clearly understand that various modification can be made without departing from the spirit and scope of the present disclosure defined in the claims attached, and replacement with equivalent assemblies are possible in the embodiments. The drawings may not be depicted according to the actual scale and proportion. Due to variants in the manufacturing process and so on, there may be difference between the art in the present disclosure and practical apparatus. There may exist other embodiments of the present disclosure that are not explicitly disclosed. The specification and drawings should be considered explanatory rather than as a limitation. Modification can be implemented in order to make practical condition, material, substance composition, method or process comply with the objective, spirit and scope of the present disclosure. All modifications of this kind are within the scope of the claims as attached. Although the method disclosed in the contents are describe with specific operation that are implemented in a specific order, it can be understood that an equivalent method can be formed by combining, dividing or rearranging the operation without departing from the teaching of the present disclosure. Therefore, the order and classification of the operation do not form a limitation on the present disclosure unless otherwise specify in the contents.
Number | Date | Country | Kind |
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111147611 | Dec 2022 | TW | national |