TWI421418B - One - way Clutch and Its Manufacturing Method - Google Patents

Description

One-way clutch and manufacturing method thereof

The present invention relates to a one-way clutch, and more particularly to a structure and method of manufacture of a one-way clutch.

Please refer to FIG. 1 and FIG. 2 for a structural diagram of a conventional one-way clutch including a first collar 1, a second collar 2, a circular cage 3, and a plurality of rollers. 4 is a plurality of elastic members 5 corresponding to the plurality of rollers 4, wherein the first collar 1 and the second collar 2 are relatively rotated, and the first collar 1 can be disposed on the second collar 2 The first collar 1 has a plurality of pockets 6 corresponding to the plurality of rollers 4, and the circular cage 3 is located between the first collar 1 and the second collar 2 and is fixed thereto. The first collar 1 has a plurality of slots 7 corresponding to the plurality of rollers 4 and exposing the plurality of pockets 6, the plurality of pockets 6 each having an inclined bottom surface 8, and the inclined bottom surface 8 is lower and the The distance of the second collar 2 is greater than the diameter of the roller 4, and the distance from the upper portion of the inclined bottom surface 8 to the second collar 2 is smaller than the diameter of the roller 4.

Further, the plurality of rollers 4 are disposed one-to-one in the plurality of slots 7 and are received in the plurality of recesses 6. The plurality of elastic members 5 press the sidewalls of the plurality of slots 7 and push the plurality of slots The roller 4 contacts the upper portion of the inclined bottom surface 8.

According to this, when the second collar 2 is driven to rotate relative to the first collar 1 toward the inclined bottom surface 8, since the plurality of rollers 4 are in contact with the inclined bottom surface 8, the plurality of rollers 4 will At the same time, the second collar 2 and the first collar 1 are contacted, so that the plurality of rollers 4 can be transmitted as a transmission structure, and the second collar 2 can drive the first collar 1 to rotate.

When the rotation speed of the first collar 1 is greater than the second collar 2, the first collar 1 will make the roller 4 contacting the lower portion of the inclined bottom surface 8 (as shown in FIG. 2), so that the roller 4 is separated from the second collar 2, that is, the first collar 1 is rotated faster than the second shaft Torque cannot be transmitted between the second collar 2 and the first collar 1 at the ring 2.

Please refer to FIG. 3 again. For another conventional one-way clutch structure, the first collar 1A can also be disposed outside the second collar 2A, that is, the first collar 1A and the second collar 2A. The positions can be interchanged to form another equivalent structure, which can also achieve the same transmission effect.

The conventional transmission structure requires a laterally arranged elastic member 5, so that it occupies a considerable space, which limits the number of the plurality of rollers 4 that can be set, that is, when the second collar 2 rotates, as a transmission The number of the plurality of rollers 4 of the structure is limited, so that the torque that the second collar 2 can transmit to the first collar 1 is also limited, and thus it is not possible to apply a condition requiring high torque transmission. In addition, this conventional structure requires compression of a plurality of elastic members 5 during assembly. During the assembly process, the elastic members 5 may be unintentionally detached, so that assembly is difficult and often required. Skilled assembly personnel and special equipment can be assembled smoothly, resulting in high assembly costs.

Accordingly, it is a primary object of the present invention to disclose a one-way clutch structure that can increase the transmitted torque.

A secondary object of the present invention is to disclose a method of fabricating a one-way clutch.

Based on the above object, the present invention is a one-way clutch including a plurality of rollers, a first collar, a second collar and a circular cage, wherein the first collar and the second collar are sleeved The first collar has a plurality of pockets corresponding to the plurality of rollers, the plurality of pockets each having an inclined bottom surface, and the lower portion of the inclined bottom surface is spaced from the second collar by a larger distance than the roller The diameter of the inclined bottom surface is higher than the diameter of the roller by the second collar.

The circular cage is located between the first collar and the second collar, and the second collar closely contacts the circular cage, and the circular cage rotates by friction, the circle Cage and There are a plurality of slots corresponding to the plurality of rollers and exposing the plurality of pockets, and the plurality of rollers are disposed one-to-one in the plurality of slots and are received in the plurality of pockets.

When the second collar is driven to rotate relative to the first collar toward the inclined bottom surface, the second collar may rotate the circular cage due to frictional force to push the roller to contact the tilt The upper portion of the bottom surface, so that the plurality of rollers will simultaneously contact the second collar and the first collar, and the plurality of rollers serve as a transmission structure, and the second collar drives the first collar to rotate. Even if the torque is transmitted from the second collar to the first collar; and when the rotational speed of the first collar is greater than the second collar, the roller will enter a lower portion of the inclined bottom surface, thus The roller is separated from the second collar, that is, when the first collar rotates faster than the second collar, the torque cannot be transmitted between the second collar and the first collar.

In addition, the second collar is in close contact with the circular cage, and the manufacturing method of the circular cage can be driven by friction, in addition to precisely controlling the size of the second collar and the circular cage. The present invention also allows the circular cage to have an opening, and the size of the circular cage is slightly different from the size of the second collar, and the size of the circular cage is elastically deformed. Engaging with the second collar, the elasticity of the circular cage and the difference in size with the second collar are utilized, so that the second collar closely contacts the circular cage, so that The circular cage is rotated by friction.

Accordingly, the present invention forms a structure that does not require the lateral arrangement of the elastic members, and thus has a large number of rollers disposed in the space, which can increase the transmission torque and eliminate the need to install the elastic members, and the present invention provides a simple manufacturing. The method allows the second collar to closely contact the circular cage to avoid insufficient friction between the second collar and the circular cage due to manufacturing tolerances, thereby causing the invention to be incorrect. The problem of action.

Conventional knowledge

1, 1A‧‧‧ first collar

2, 2A‧‧‧ second collar

3‧‧‧Circular cage

4‧‧‧ Roller

5‧‧‧Flexible parts

6‧‧‧ recess

7‧‧‧through slot

8‧‧‧Sloping bottom surface

this invention

10‧‧‧ Roller

20, 20A‧‧‧ first collar

21‧‧‧ recess

22‧‧‧Sloping bottom surface

30, 30A‧‧‧ second collar

40, 40A‧‧‧round cage

41‧‧‧through slot

42‧‧‧ openings

50‧‧‧Roller bearing

Figure 1 is a cross-sectional view showing a conventional one-way clutch structure.

Figure 2 is a schematic view of the conventional one-way clutch operation.

3 is a cross-sectional view showing another conventional one-way clutch structure. .

4 is a cross-sectional view showing the structure of a one-way clutch of the present invention.

Figure 5 is an exploded perspective view of the one-way clutch component of the present invention.

Figure 6 is a structural view of a circular cage of the present invention.

Figure 7 is a cross-sectional view showing another one-way clutch of the present invention.

FIG. 8 is a first schematic view of the operation of the one-way clutch of the present invention.

FIG. 9 is a second schematic view of the operation of the one-way clutch of the present invention.

The detailed description of the present invention and the technical description of the present invention are further illustrated by the accompanying drawings, but it should be understood that these embodiments are merely illustrative and not to be construed as limiting.

Referring to FIG. 4 and FIG. 5, the present invention includes a plurality of rollers 10, a first collar 20, a second collar 30 and a circular cage 40, wherein the first collar 20 The second collar 30 is rotatably coupled to the second collar 30, and at least one roller bearing 50 may be disposed between the first collar 20 and the second collar 30, wherein the preferred number is one or two sets. The first collar 20 is sleeved in the second collar 30. The first collar 20 has a plurality of pockets 21 corresponding to the plurality of rollers 10, each of the plurality of pockets 21 having an inclined bottom surface 22 And the distance between the lower portion of the inclined bottom surface 22 and the second collar 30 is greater than the diameter of the roller 10, and the distance between the inclined bottom surface 22 and the second collar 30 is smaller than the diameter of the roller 10.

The circular retainer 40 is located between the first collar 20 and the second collar 30, and the second collar 30 closely contacts the circular cage 40, and the circular cage is driven by friction. 40 turns.

The contact surface of the circular retainer 40 with the second collar 30 contains a wear resistant material. If the circular holder 40 is made of metal, the wear resistant material may be a coating based on polyaryletherketone (PAEK) or polytetrafluoroethylene (PTFE), and the coating is Can be added At least one additive may be added, which may be selected from the group consisting of graphite, molybdenum disulfide, polyaryletherketone, and polytetrafluoroethylene. That is, when the substrate of the coating is polyaryletherketone, the additive may be graphite, molybdenum disulfide, and polytetrafluoroethylene, and any one, any two, or any three; When the material is polytetrafluoroethylene, the additive may be three materials of graphite, molybdenum disulfide, and polyaryletherketone, and may be arbitrarily selected, arbitrarily selected or arbitrarily selected. In addition, the circular holder 40 can also be made of plastic, and at least one additive can be added to the plastic to enhance wear resistance. Similarly, the additive can be selected from the group consisting of graphite, molybdenum disulfide, polyaryl ether ketone and poly four. A group consisting of vinyl fluoride. The wear resistant material serves to provide a sliding interface that is less prone to wear and provides adequate friction.

In addition, the circular retainer 40 has a plurality of through slots 41 corresponding to the plurality of rollers 10 and exposing the plurality of recesses 21, and the plurality of rollers 10 are one-to-one disposed in the plurality of slots 41 and are accommodated. Within the plurality of pockets 21.

Please refer to FIG. 6 again to achieve the purpose that the second collar 30 is in close contact with the circular cage 40 and the circular cage 40 is rotated by friction, except that the second is accurately controlled. In addition to the dimensions of the collar 30 and the circular retainer 40, the present invention also allows the circular retainer 40 to have an opening 42 that allows the circular retainer 40 to be slightly resized. The size of the circular retainer 40 when it is not assembled has a slight difference from the size of the second collar 30, and the size of the circular retainer 40 is adjusted in the elastic deformation range and the second collar 30 when assembled. That is, the elasticity of the circular cage 40 and the difference in size with the second collar 30 can be utilized, and the second collar 30 is in close contact with the circular cage 40 to utilize the friction force to drive the The circular cage 40 rotates.

Please refer to FIG. 7 again, which is another equivalent embodiment of the present invention, wherein the first collar 20A can also be sleeved outside the second collar 30A, and the inside of the circular cage 40A The diameter is in close contact with the outer diameter of the second collar 30A, and the second collar 30A utilizes friction to drive the circular cage 40A to rotate.

In addition, the manufacturing method of the present invention can be divided into two types according to the difference between the two equivalent structures. First, when the first collar 20 is sleeved in the second collar 30, When the circular retainer 40 is not assembled, the outer diameter is slightly larger than the inner diameter of the second collar 30. When assembled, the circular retainer 40 is compressed to be reduced in size and can be inserted into the second collar 30. That is, the elastic force of the circular holder 40 is opened, so that the second collar 30 is in close contact with the circular holder 40.

Secondly, when the first collar sleeve 20A is disposed outside the second collar 30A, the inner diameter of the circular cage 40A when assembled is slightly smaller than the outer diameter of the second collar 30A, and the assembly time is The circular retainer 40A is inserted into the second collar 30A in an enlarged size, that is, the elastic contraction of the circular retainer 40A is contracted, so that the second collar 30A is in close contact with the circular retainer 40A.

Please refer to FIG. 8 and FIG. 9 again, which is a schematic diagram of the operation of the present invention. First, when the second collar 30 is driven to rotate relative to the first collar 20 toward the inclined bottom surface 22, the The second collar 30 drives the circular cage 40 to rotate by friction to push the roller 10 to contact the upper portion of the inclined bottom surface 22, thereby allowing the plurality of rollers 10 to simultaneously contact the first collar 20 and the second collar 30 as a transmission structure, the second collar 30 drives the first collar 20 to rotate, and even if the torque is transmitted from the second collar 30 to the first collar 20; When the rotational speed of the first collar 20 is greater than the second collar 30, the roller 10 will enter the lower portion of the inclined bottom surface 22, so that the roller 10 will be separated from the second collar 30 and cannot transmit torque. That is, when the rotational speed of the first collar 20 is greater than the second collar 30, the torque cannot be transmitted between the second collar 30 and the first collar 20. When the rotation speed of the first collar 20 is greater than the second collar 30, the circular cage 40 rotates with the first collar 20, thereby causing the circular cage 40 and the second collar 30. There is a difference in rotational speed, and the wear-resistant material contained on the contact surface of the circular retainer 40 and the second collar 30 can reduce friction and avoid wear of the contact surface.

As described above, the present invention can eliminate the use of the elastic member, and therefore has more space for installing more rollers 10, thereby increasing the transmitted torque and eliminating the need to install the elastic member, thereby reducing the assembly cost. . Still another aspect of the invention is to provide a circular cage 40, 40A and a second shaft A manufacturing method for maintaining proper friction between the rings 30, 30A, which does not require precise dimensional control, and avoids dimensional differences caused by manufacturing tolerances, resulting in the circular cage 40, 40A and the second collar 30, 30A The problem of friction between the two is too small to be able to move.

The above are only the preferred embodiments of the present invention and are not intended to limit the scope of the embodiments of the present invention. That is, the equivalent changes and modifications made by the scope of the patent application of the present invention are covered by the scope of the invention.

10‧‧‧ Roller

20‧‧‧First collar

21‧‧‧ recess

22‧‧‧Sloping bottom surface

30‧‧‧Second collar

40‧‧‧round cage

41‧‧‧through slot

Claims (12)

A one-way clutch includes: a plurality of rollers; a first collar; a second collar, the first collar and the second collar are relatively rotated, and the first collar has a corresponding number a plurality of pockets of the plurality of rollers, each of the plurality of pockets having an inclined bottom surface, and the lower portion of the inclined bottom surface is spaced from the second collar by a distance greater than a diameter of the roller, the inclined bottom surface being higher and the second The collar has a smaller distance than the diameter of the roller; and a circular cage having an opening, the circular cage being located between the first collar and the second collar, and the first The two-axis ring closely contacts the circular cage, and the circular cage rotates by friction. The circular cage has a plurality of slots corresponding to the plurality of rollers and revealing the plurality of pockets, and the plurality One-to-one rollers are disposed in the plurality of slots and are received in the plurality of pockets. The one-way clutch of claim 1, wherein the contact surface of the circular cage with the second collar comprises a wear resistant material. The one-way clutch of claim 2, wherein the circular cage is made of metal, and the wear-resistant material of the contact surface with the second collar is polyaryletherketone or polytetrafluoroethylene. a coating, and at least one additive may be added to the coating, and the additive may be selected from the group consisting of graphite, molybdenum disulfide, polyaryletherketone, and polytetrafluoroethylene. The one-way clutch of claim 1, wherein the circular cage is plastic, and at least one additive may be further added to the plastic, the additive may be selected from the group consisting of graphite, molybdenum disulfide, and polyaryl ether ketone. A group consisting of polytetrafluoroethylene. The one-way clutch of claim 1, wherein the first collar is sleeved on the second Inside the collar. The one-way clutch of claim 5, wherein the outer diameter of the circular cage is slightly larger than the inner diameter of the second collar. The one-way clutch of claim 1, wherein the first collar is sleeved outside the second collar. The one-way clutch of claim 7, wherein the inner diameter of the circular cage is slightly smaller than the outer diameter of the second collar. The one-way clutch of claim 1, wherein at least one set of roller bearings is disposed between the first collar and the second collar. A method of manufacturing a one-way clutch according to claim 1, wherein the circular retainer has an opening, and the size of the circular retainer when unassembled and the size of the second collar are The slight difference is that the size of the circular cage is assembled with the second collar in the elastic deformation range during assembly. The method of manufacturing the one-way clutch of claim 10, wherein the first collar is sleeved in the second collar, and the outer diameter of the circular cage is slightly larger than the second The inner diameter of the collar is compressed during assembly to reduce the size and fit into the second collar. The method of manufacturing the one-way clutch according to claim 10, wherein the first collar is sleeved outside the second collar, and the inner diameter of the circular cage is smaller than the second axis when not assembled. The outer diameter of the ring, which is opened when assembled, is inserted into the outer circumference of the second collar in an enlarged size.