WO2022264408A1

WO2022264408A1 - Torque transmitting element

Info

Publication number: WO2022264408A1
Application number: PCT/JP2021/023224
Authority: WO
Inventors: 忠彦加藤; 義弘山内; 泰雅中條
Original assignee: 株式会社ユニバンス
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2022-12-22
Also published as: JPWO2022264408A1

Abstract

Provided is a torque transmitting element (10) that can be easily manufactured. This torque transmitting element is disposed on a shaft (33) having, in an outer circumference thereof, a plurality of grooves (35) that extend in the axial direction. The torque transmitting element comprises: a ring (11) surrounding the shaft; and a plurality of blocks (20) which are disposed between the ring and the shaft at intervals from each other in the circumferential direction of the ring, and each of which has a portion (26) positioned on an axially outer side of the ring. The blocks each comprise: teeth (22) provided on an inner surface (21) facing the outer circumference of the shaft; and a first coupling section (24) provided on an outer surface (23) opposite to the inner surface. The teeth are fitted to the grooves of the shaft, and the ring comprises a second coupling section (12) fitted to the first coupling section.

Description

torque transmission element

The present invention relates to a torque transmission element forming part of a dog clutch.

Dog clutches (jaw clutches) that transmit and block torque between the drive side and the driven side that are coaxially located are mesh clutches that are engaged by the rectangular or radial irregularities on the opposing cylindrical end faces. be. Among dog clutches disclosed in Patent Document 1, a torque transmission element that moves along a shaft includes a ring surrounding the shaft and a plurality of projections axially protruding from the ring. The torque transmission element is a one-piece molded product with a large height difference between the protrusion and the ring.

Japanese Patent No. 5106385

　In the prior art, the process of producing the projections of the torque transmission element is complicated.

The present invention has been made to solve this problem, and aims to provide a torque transmission element that can be easily manufactured.

To this end, the present invention provides a torque transmitting element arranged on a shaft provided with a plurality of axially extending grooves on its outer periphery, a ring surrounding the shaft and spaced from each other in the circumferential direction of the rings. and a plurality of blocks disposed between the ring and the shaft, a portion of each of which is positioned axially outside the ring. The block comprises teeth provided on an inner surface facing the outer circumference of the shaft and a first coupling portion provided on an outer surface opposite the inner surface. The teeth fit into grooves in the shaft and the ring has a second joint that fits into the first joint.

According to the first aspect, a plurality of blocks are arranged between the ring and the shaft at intervals in the circumferential direction of the ring surrounding the shaft, and some of the blocks are positioned outside the ring in the axial direction. Teeth provided on the inner surface of the block facing the outer circumference of the shaft fit into grooves in the shaft. A first joint provided on the outer surface opposite the inner surface of the block fits into a second joint on the ring to create a torque transmitting element. Since the ring and block are separate members, the torque transmission element can be easily manufactured.

According to the second aspect, in the first aspect, the contact portion of the ring adjacent to the second coupling portion faces the outer surface of the block. The radial outward travel of the block is restricted to the ring.

According to the third aspect, in the first or second aspect, one of the first coupling portion and the second coupling portion is a projection and the other is a hole that fits into the projection. Axial and circumferential movement of the block is restricted to the ring because the protrusion and the hole fit together.

According to a fourth aspect, in the third aspect, there is a first axial gap between the protrusion and the hole. Since the block can move relative to the ring by the first gap, the force acting on the ring due to the moment of the block when the block transmits torque can be reduced. Therefore, damage to the ring can be reduced.

According to the fifth aspect, in the third or fourth aspect, there is a second circumferential gap between the protrusion and the hole. The restrictions on the position of the block in the circumferential direction with respect to the ring can be relaxed by the amount of the second gap. Since the block can reduce the force applied to the ring when transmitting torque, damage to the ring can be reduced.

According to a sixth aspect, in any one of the first to fifth aspects, the block is a sintered body. Therefore, the secondary processing of the block such as cutting can be reduced.

1 is a perspective view of a torque transmission element in one embodiment; FIG. FIG. 3 is a perspective view of a ring and block; It is a front view of a dog clutch. FIG. 4 is a cross-sectional view of a torque transmission element; 4 is a cross-sectional view of the torque transmission element taken along line VV of FIG. 3; FIG.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a torque transmission element 10 in one embodiment. The torque transmission element 10 includes a circular ring 11 centered on the axis O, and a plurality of blocks 20 spaced apart from each other in the circumferential direction of the ring 11 . In this embodiment, six blocks 20 of the same shape and size are arranged on the ring 11 at equal intervals in the circumferential direction.

The block 20 has a plurality of teeth 22 parallel to the axis O on the inner surface 21 facing the axis O. The shape of the tooth 22 is not particularly limited. When viewed from the axial direction, the teeth 22 are appropriately set to be surrounded by a curve such as an involute curve or square.

FIG. 2 is a perspective view of the ring 11 and block 20. FIG. Ring 11 and block 20 are each made of metal. The ring 11 is, for example, an integrally molded product (forged product) by forging. Block 20 is, for example, a sintered body. The ring 11 is provided with an oil groove (not shown).

The block 20 is provided with a first coupling portion 24 on the outer surface 23 facing away from the inner surface 21 . The first coupling portion 24 is provided at the center position of the outer surface 23 in the axial direction. In this embodiment, the first connecting portion 24 is a closed hole that is longer in the circumferential direction than the axial width and that opens to the outer surface 23 and does not communicate with the inner surface 21 . Since the inner surface 21 is not perforated, the teeth 22 are continuous over the entire axial length of the inner surface 21 of the block 20 . This makes the teeth 22 less likely to break.

The ring 11 has a second coupling portion 12 that fits into the first coupling portion 24 of the block 20 and a contact portion 13 adjacent to the second coupling portion 12 . The contact portions 13 are provided on the ring 11 adjacent to both circumferential sides of the second coupling portion 12 . The corner where the second connecting portion 12 and the contact portion 13 are connected is rounded. This is for alleviating the stress at the corners.

In the present embodiment, the second coupling portion 12 is a convex portion that is longer in the circumferential direction than the thickness in the axial direction and protrudes inward in the radial direction of the ring 11 . The axial thickness of the protrusion is substantially equal to the axial thickness of the ring 11 . The shape of the protrusion when viewed from the axial direction is a trapezoid in which the length in the circumferential direction becomes shorter toward the inner side in the radial direction. The radial thickness of the ring 11 is substantially constant over the entire circumferential length of the ring 11 except for the second coupling portion 12 (convex portion) and the oil groove (not shown). This is to prevent the stress in a specific portion of the ring 11 from becoming excessive.

The block 20 includes a first portion 25 located radially inside the ring 11 and an axially outside of the first portion 25 when the first coupling portion 24 and the second coupling portion 12 are fitted together. and a second portion 26 adjacent to the . The first coupling portion 24 is provided on the first portion 25 . In this embodiment, the radial thickness of the first portion 25 is equal to the radial thickness of the second portion 26 . The fit between the second coupling portion 12 (convex portion) and the first coupling portion 24 (hole) is a clearance fit.

Return to Figure 1 for explanation. The second portion 26 is located axially outside the ring 11 . In this embodiment, the second portions 26 are provided on both sides of the ring 11 in the axial direction. The second portion 26 includes a first surface 27 facing one side in the circumferential direction and a second surface 28 located on the opposite side of the first side 27 and facing the other side in the circumferential direction. The first surface 27 includes a plane substantially parallel to the axis O. As shown in FIG. The second surface 28 includes an inclined surface that slopes toward the first surface 27 as it moves away from the ring 11 in the axial direction.

FIG. 3 is a front view of the dog clutch 30 including the torque transmission element 10. FIG. The dog clutch 30 is a device that transmits and interrupts torque between the shaft 31 and the first member 36 or the second member 40 . A plurality of grooves 32 extending in the axial direction are provided on the outer circumference of the shaft 31 . An annular hub 33 is fixed to the shaft 31 so as not to move in the axial direction. The inner peripheral surface of the hub 33 is provided with teeth 34 (see FIG. 4) that fit into the grooves 32 of the shaft 31 . The teeth 34 of the hub 33 fit into the grooves 32 of the shaft 31 and the hub 33 rotates together with the shaft 31 . Hub 33 is part of shaft 31 .

A groove 35 extending in the axial direction is provided on the outer peripheral surface of the hub 33 . The groove 35 extends over the entire axial length of the hub 33 . A tooth 22 (see FIG. 1) provided on the block 20 of the torque transmission element 10 fits into the groove 35 of the hub 33 . The torque transmission element 10 can move axially along the grooves 35 in which the teeth 22 fit while rotating integrally with the shaft 31 . When an actuator (not shown) is operated to move the ring 11 in the axial direction, the block 20 moves along with the ring 11 .

The first member 36 is fixed to the shaft 31 so as to be rotatable relative to the shaft 31 and immovable in the axial direction. A ridge (not shown) forming a first gear is provided on the outer peripheral surface of the first member 36 . A plurality of protrusions 37 are provided on the axial end face of the first member 36 . Torque is transmitted between the shaft 31 and the first member 36 as the torque transmitting element 10 moves axially to engage the projection 37 of the first member 36 with the second portion 26 of the block 20 . When the engagement between the second portion 26 and the projection 37 is released, torque transmission between the shaft 31 and the first member 36 is interrupted.

The projection 37 has a third surface 38 facing one side in the circumferential direction, and a fourth surface 39 located on the opposite side of the third surface 38 and facing the other side in the circumferential direction. The third surface 38 includes a plane substantially parallel to the axis O. The fourth surface 39 includes an inclined surface that inclines so as to approach the third surface 38 as it goes toward the tip of the projection 37 in the axial direction. When the third surface 38 of the projection 37 faces the first surface 27 of the second portion 26 and the fourth surface 39 of the projection 37 faces the second surface 28 of the second portion 26, the second portion of the torque transmission element 10 26 and projection 37 mesh with each other.

The second surface 28 of the second portion 26 and the fourth surface 39 of the protrusion 37 transmit torque to the first member 36 according to torque (for example, coasting torque) in the direction of pressing the second surface 28 and the fourth surface 39. A thrust is generated axially separating the element 10 . The first surface 27 of the second part 26 and the third surface 38 of the protrusion 37 press the first surface 27 and the third surface 38 to generate torque (for example, drive torque) between the first member 36 and the torque transmission element 10 . ). The force applied to the torque transmission element 10 when the torque is transmitted by pressing the first surface 27 and the third surface 38 is equal to the force applied to the torque transmission element 10 when the torque is transmitted by pressing the second surface 28 and the fourth surface 39 together. greater than the force applied to 10.

A second member 40 is arranged on the axially opposite side of the first member 36 with the torque transmission element 10 interposed therebetween. The second member 40 is fixed to the shaft 31 so as to be rotatable relative to the shaft 31 and immovable in the axial direction. A ridge (not shown) forming a second gear is provided on the outer peripheral surface of the second member 40 . The number of teeth of the second gear is different than the number of teeth of the first gear.

A plurality of protrusions 37 are provided on the axial end surface of the second member 40 . Torque is transmitted between the shaft 31 and the second member 40 when the torque transmitting element 10 moves axially and the projection 37 engages the second portion 26 . When the engagement between the second portion 26 and the protrusion 37 is released, torque transmission between the shaft 31 and the second member 40 is interrupted.

4 is a cross-sectional view including the axis O of the torque transmission element 10 arranged on the shaft 31. FIG. 4, illustration of one side of the torque transmission element 10 bordering on the axis O is omitted. The second coupling portion 12 (convex portion) of the ring 11 of the torque transmission element 10 and the first coupling portion 24 (hole) of the block 20 fit together, and the block is formed between the ring 11 and the shaft 31 (hub 33). 20 are placed.

Since the ring 11 and the block 20 are separate members, the ring 11 and the block 20 that constitute the torque transmission element 10 can be manufactured separately. As a result, it is possible to easily manufacture the torque transmission element 10 having a large change in axial dimension (difference in height between the ring 11 and the second portion 26). If the block 20 is a sintered body, it is more preferable because secondary processing of the block 20 such as cutting can be reduced.

Since the convex portion 12 provided on the ring 11 fits into the hole 24 provided in the block 20, compared to the case where the convex portion provided on the block 20 fits in the hole provided in the ring 11, the axial movement of the ring 11 is reduced. The thickness of the direction can be thinned.

The projection 12 provided on the ring 11 has a circumferential length longer than its axial thickness, and the axial thickness of the projection 12 is substantially equal to the axial thickness of the ring 11 . As a result, the cross-sectional area of the convex portion 12 can be secured while the thickness of the ring 11 in the axial direction can be reduced, and the mechanical strength of the convex portion 12 can be secured.

Since there is play (gap) between the teeth 22 of the block 20 and the grooves 35 of the hub 33, when the block 20 transmits torque, a moment around the convex portion 12 is generated in the block 20 by the amount of play. There is a first axial clearance 14 between the projection 12 and the hole 24 of the torque transmitting element 10 . Since the block 20 can move in the axial direction with respect to the ring 11 by the amount of the first gap 14, the force acting on the ring 11 due to the moment of the block 20 can be reduced. Therefore, the restriction of the block 20 by the ring 11 can be reduced, and damage to the ring 11 can be reduced.

By making the size of the first gap 14 larger than the amount of movement of the block 20 due to the moment around the convex portion 12 , it is possible to prevent the ring 11 from being subjected to the force that rotates the ring 11 due to the moment of the block 20 . Damage to the ring 11 due to the moment of the block 20 can be prevented.

FIG. 5 is a cross-sectional view perpendicular to the axis O of the torque transmission element 10 taken along line VV in FIG. In FIG. 5 one of the blocks 20 of the torque transmission element 10 is illustrated. The contact portion 13 of the ring 11 adjacent to the protrusion 12 faces the outer surface 23 of the block 20 . There may be a gap between the outer surface 23 of the block 20 and the contact portion 13 when no centrifugal force acts on the block 20, or the outer surface 23 of the block 20 and the contact portion 13 may always be in contact. The contact portion 13 comes into contact with the block 20 when centrifugal force acts on the block 20, and restricts the outward movement of the block 20 in the radial direction. Since the contact portions 13 are adjacent to both sides of the second joint portion 12 in the circumferential direction, the thickness of the ring 11 in the axial direction is reduced compared to the case where the second joint portion 12 and the contact portion 13 are axially adjacent to each other. can be made thinner.

When the projection 37 of the first member 36 (see FIG. 3) engages the second portion 26 (see FIG. 4) of the block 20, the torque transmission element 10 transmits torque between the shaft 31 and the first member 36. Although there are six second portions 26 on the ring 11 that engage the projections 37 of the first member 36, the actual transmission of torque between the second portions 26 and the projections 37 depends on the six second portions 26. Of these, only the one that contacts the protrusion 37 is provided. As the number of the second portions 26 in contact with the protrusion 37 increases, the force applied to one second portion 26 decreases, so the mechanical strength required for the torque transmission element 10 decreases, which is preferable. Conventionally, a torque transmission element comprising a projection and a ring is integrally molded (Patent Document 1). In order to reduce variations in (pitch), secondary processing such as cutting is applied to the protrusions.

On the other hand, the torque transmission element 10 has a second circumferential gap 15 between the protrusion 12 and the hole 24 . The second gap 15 allows each block 20 to move circumferentially relative to the ring 11 . The size of the second gap 15 is such that the ring 11 does not constrain the circumferential position of the block 20, and the circumferential position of the block 20 is such that the tooth 22 of the block 20 fits into the groove 35 of the hub 33. It is preferred that the size be determined by Since the ring 11 does not limit the position of the block 20 in the circumferential direction, it is possible to reduce variations in the circumferential interval (pitch) of the second portions 26 arranged on the ring 11 without performing secondary processing such as cutting. can.

If the accuracy of the pitch in the circumferential direction of the projections 37 of the first member 36 is ensured, when the projections 37 of the first member 36 are engaged with the second portions 26 of the block 20, a large number of the second portions 26 come into contact with the projections 37. can be done. Since the force applied to the torque transmission element 10 when transmitting torque can be made uniform in the circumferential direction of the ring 11, the safety factor of the torque transmission element 10 can be reduced compared to the case where the torque transmission element is an integrally molded product. The ring 11 can be made thinner and the block 20 can be made smaller, since the torque transmission element 10 does not need to be excessively mechanically strong. Therefore, reduction in size and weight of the torque transmission element 10 can be expected.

The presence of the second gap 15 can reduce the force applied by the block 20 to the ring 11 when the block 20 transmits torque. Therefore, the restriction of the block 20 by the ring 11 can be reduced, and damage to the ring 11 can be reduced. If the size of the second gap 15 is such that the position of the block 20 in the circumferential direction is determined by the position where the teeth 22 of the block 20 fit into the grooves 35 of the hub 33, torque is transmitted. Since the force applied to the block 20 is not transmitted to the ring 11, the ring 11 can be prevented from being damaged.

Although the present invention has been described above based on the embodiments, the present invention is by no means limited to these embodiments, and various improvements and modifications can easily be made without departing from the scope of the present invention. can be inferred. For example, the shapes of the ring 11 and blocks 20, the number of blocks 20 arranged in the ring 11, and the like can be appropriately set.

In the embodiment, the case where the first surface 27 of the second portion 26 of the block 20 and the axis O are substantially parallel and the second surface 28 of the second portion 26 and the axis O are in a twisted position has been described. , but not necessarily limited to this. The angles of the first surface 27 and the second surface 28 with respect to the axis O can be appropriately set. For example, it is naturally possible to make the second surface 28 of the second part 26 substantially parallel to the axis O, or to provide a plurality of surfaces having different angles with respect to the axis O in the first surface 27 and the second surface 28. is.

In the embodiment, a case has been described where all of the blocks 20 arranged on the ring 11 have the same size, but this is not necessarily the case. It is of course possible to dispose a plurality of types of blocks 20 having different axial lengths on the ring 11 to vary the axial height of the second portion 26 from the ring 11 .

In the embodiment, the case where the radial thickness of the first portion 25 of the block 20 is equal to the radial thickness of the second portion 26 has been described, but this is not necessarily the case. In relation to the member with which the second portion 26 of the torque transmission element 10 meshes, the radial thickness of the first portion 25 may be made thinner than the radial thickness of the second portion 26, or the radial thickness of the first portion 25 may be reduced. It is of course possible to make the thickness thicker than the radial thickness of the second portion 26 .

In the embodiment, the dog clutch 30 is described in which the first member 36 and the second member 40 are arranged on both sides of the torque transmission element 10 in the axial direction, and the block 20 symmetrical with respect to the plane perpendicular to the axis O is arranged on the ring 11. Thus, the case where the second portions 26 of the blocks 20 are provided on both sides of the ring 11 in the axial direction has been described. However, it is not necessarily limited to this. In the case of the dog clutch 30 in which the first member 36 or the second member 40 is omitted, the second portion 26 of the block 20 may be provided on one side of the ring 11 in the axial direction. The torque-transmitting element 10 in this case arranges blocks on the ring 11 that are asymmetric with respect to a plane perpendicular to the axis O. FIG.

Although the embodiment describes the case where the torque transmission element 10 is arranged on the hub 33 arranged on the shaft 31, it is not necessarily limited to this. Of course, it is possible to omit the hub 33 and fit the teeth 22 of the torque transmission element 10 into the grooves 32 of the shaft 31 .

In the embodiment, the ring 11 is provided with the second coupling portion 12, and the block 20 is provided with the first coupling portion 24, but the configuration is not necessarily limited to this. Of course, it is possible to make the second connecting portion 12 of the ring 11 a hole and the first connecting portion 24 of the block 20 a protrusion. The shape and number of protrusions and holes can be set as appropriate. Also in this case, the same effect as that of the embodiment can be achieved by loosely fitting the protrusion and the hole.

In the embodiment, the case where the second coupling portion 12 and the contact portion 13 of the ring 11 are adjacent to each other in the circumferential direction has been described, but this is not necessarily the case. Of course, it is possible to provide the second coupling portion 12 and the contact portion 13 on the ring 11 so that the second coupling portion 12 and the contact portion 13 are axially adjacent to each other.

In the embodiment, the case where the ring 11 provided with the second connecting portion 12 consisting of the convex portion is an integrally molded product (forged product) has been described, but it is not necessarily limited to this. Of course, it is possible to manufacture the protrusion and the ring 11 separately and join the protrusion to the ring 11 by press-fitting, welding, or the like. When the projections are provided on the block 20, a sintered body in which the projections are provided integrally with the block 20 is used, or the projections and the block 20 are manufactured separately, and the projections are formed on the block 20 by press-fitting or welding. It is of course possible to join them.

10 torque transmission element 11 ring 12 second coupling portion (convex portion)
REFERENCE SIGNS LIST 13 contact part 14 first gap 15 second gap 20 block 21 inner surface 22 tooth 23 outer surface 24 first joint (hole)
26 Part 2 (part of block)
31 shaft 33 hub (part of shaft)
35 Groove

Claims

A torque transmission element disposed on a shaft having a plurality of axially extending grooves on its outer periphery,
a ring surrounding the shaft;
a plurality of blocks arranged between the ring and the shaft at intervals in the circumferential direction of the ring, and a portion of each block positioned outside the ring in the axial direction;
the block has teeth provided on an inner surface facing the outer circumference of the shaft;
a first coupling portion provided on an outer surface opposite the inner surface;
the teeth fit into the grooves of the shaft;
The ring is a torque transmitting element comprising a second coupling portion that fits into the first coupling portion.
the ring comprises a contact portion adjacent to the second coupling portion;
2. The torque transmission element according to claim 1, wherein said contact portion faces said outer surface of said block.
　The torque transmission element according to claim 1 or 2, wherein one of the first coupling portion and the second coupling portion is a protrusion and the other is a hole that fits into the protrusion.
The torque transmission element according to claim 3, wherein there is a first axial clearance between said protrusion and said hole.
The torque transmission element according to claim 3 or 4, wherein there is a second circumferential gap between the protrusion and the hole.
The torque transmission element according to any one of claims 1 to 5, wherein the block is a sintered body.