JP2018119661A - Gear for transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a gear for transmission with a novel structure where, for example, inconvenience is improved.SOLUTION: A gear for transmission is, for example, provided rotatably around a rotation center, and includes: an external tooth 15; a second tooth 16 positioned on a radial inward side of the rotation center with respect to the external tooth 15, and engaged with a first tooth 21 of a sleeve 2 with movement of the sleeve 2 toward a first direction X1 along an axis direction of the rotation center; and a stopper 17 positioned between the external tooth 15 and the second tooth 16, facing a second direction X2 opposite to the first direction X1, and configured to restrict movement of the sleeve 2 toward the first direction X1 by contacting with a contact part of the sleeve 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmission gear.

  2. Description of the Related Art Conventionally, a transmission gear including an external tooth, a second tooth that meshes with a first tooth of a sleeve, and a stopper that restricts movement of the sleeve in the axial direction is known (Patent Document 1). ). In the transmission gear of Patent Document 1, the stopper is provided on the bottom of the second tooth.

JP 2013-92177 A

  In this type of transmission gear, for example, it is meaningful to obtain a new and improved configuration with less inconveniences, such as a smaller inclination of the sleeve when abutting against the stopper.

  Accordingly, one of the objects of the present invention is to obtain a transmission gear having a novel configuration improved, for example, with less inconvenience.

  The transmission gear according to the present invention is, for example, a transmission gear provided to be rotatable around a rotation center, and is positioned on the inner side in the radial direction of the rotation center with respect to the outer teeth and the outer teeth. The sleeve is positioned between the second tooth and the second tooth engaged with the first tooth of the sleeve by the movement of the sleeve in the first direction along the axial direction of the sleeve, A stopper that faces in a second direction opposite to the first direction and restricts movement of the sleeve in the first direction by contact with the contact portion of the sleeve.

  Therefore, according to the transmission gear, the stopper is located between the outer teeth and the second teeth, that is, radially outward from the second teeth. The inclination of the sleeve when abutting against the stopper can be made smaller than in the case where the teeth are positioned inward in the radial direction with respect to the tooth bottom or the second tooth.

  In the transmission gear, for example, a hub that surrounds the rotation center, a flange portion that protrudes outward in the radial direction from the hub, and an outer end portion in the radial direction of the flange portion. A ring portion that protrudes in the second direction and is provided with the external teeth, and the stopper protrudes inward in the radial direction from the inner periphery of the ring portion.

  Therefore, according to the transmission gear, for example, compared with the case where the stopper is provided on the bottom of the second tooth, the contact area of the stopper is easily secured, and consequently the surface pressure acting on the stopper and the contact portion. Tends to be smaller.

  Further, in the transmission gear, for example, it protrudes from the hub toward the inner periphery of the ring portion, extends in the circumferential direction with a first gap in the circumferential direction of the ring portion, A plurality of protrusions provided with the second teeth, and the stopper faces the first gap and the radial direction.

  Therefore, according to the transmission gear, for example, since the second teeth and the stopper do not face in the radial direction, a space between the second teeth and the inner periphery of the ring portion is easily secured. Thereby, for example, when the second tooth is formed by forging, the second tooth can be formed more easily, more smoothly, or more accurately.

  In the transmission gear, for example, the circumferential end portion of the stopper is inclined with respect to the diameter of the ring portion, and from the inner periphery of the ring portion toward the first gap. An extending guide surface is provided.

  Therefore, according to the transmission gear, for example, the guide surface can guide the lubricating oil or the like flowing along the inner circumference of the ring portion by centrifugal force toward the first gap, and thus the first gear. Lubricity of a member arranged in the gap or in the vicinity of the gap can be improved.

FIG. 1 is an exemplary schematic cross-sectional view of a part of a transmission including the transmission gear according to the first embodiment. FIG. 2 is an exemplary schematic front view of the transmission gear according to the first embodiment. FIG. 3 is an exemplary schematic perspective view of a part of the transmission gear according to the first embodiment. FIG. 4 is an exemplary schematic front view of a part of the transmission gear according to the second embodiment.

  Hereinafter, exemplary embodiments of the present invention are disclosed. The configuration of the embodiment shown below, and the operations and effects brought about by the configuration are examples. In this specification, ordinal numbers are used to distinguish parts, parts, and the like, and do not indicate the order or priority.

  Moreover, the same component is contained in several embodiment disclosed below. Therefore, below, the same code | symbol is provided to those similar components, and the overlapping description is abbreviate | omitted. In the following drawings, directions are defined for convenience. The X direction is along the axial direction of the rotation axis Ax of the transmission gear 1, the R direction is along the radial direction of the rotation axis Ax, and the C direction is along the circumferential direction of the rotation axis Ax. The rotation axis Ax is an example of a rotation center.

  In the following description, for the sake of convenience, the right side in the axial direction in FIG. 1, that is, the transmission gear 1 side is referred to as the X1 direction, and the left side in FIG. The X1 direction is an example of the first direction, and the X2 direction is an example of the second direction.

<First Embodiment>
As shown in FIG. 1, the transmission gear 1 is supported by a shaft 3 so as to be rotatable around a rotation axis Ax via, for example, a roller bearing 4 as a bearing. That is, the transmission gear 1 is configured as a free gear and can idle with respect to the shaft 3 in a state where it is not connected to the shaft 3 by the selection mechanism 10. The shaft 3 is, for example, an input shaft, an output shaft, an idler shaft, or the like of a transmission.

  The connection state and the cutoff state of the shaft 3 and the transmission gear 1 are selectively switched by the selection mechanism 10. The selection mechanism 10 includes a sleeve 2 and a clutch hub (not shown). The clutch hub is coupled to the shaft 3 by, for example, spline coupling or the like, and rotates integrally with the shaft 3. The sleeve 2 is provided so as to rotate integrally with the clutch hub and to be movable in the axial direction with respect to the clutch hub.

  As shown in FIG. 1, the sleeve 2 has at least a separation position P0 that is separated from the transmission gear 1, and a coupling position P1 that moves from the separation position P0 in the X1 direction and is coupled to the transmission gear 1. Between, it is comprised so that movement is possible. The transmission gear 1 is rotatable relative to the shaft 3 when the sleeve 2 is positioned at the separation position P0, and rotates integrally with the shaft 3 when the sleeve 2 is positioned at the coupling position P1. Is possible. The transmission is provided with a meshing mechanism having such a transmission gear 1 and a sleeve 2.

  Next, the transmission gear 1 will be described in more detail. FIG. 2 is an exemplary and schematic front view of the transmission gear 1 according to the first embodiment. FIG. 3 is an exemplary schematic perspective view of a part of the transmission gear 1 according to the first embodiment.

  As shown in FIGS. 2 and 3, the transmission gear 1 includes, for example, a hub 11, a flange portion 12, a ring portion 13, a protruding portion 14, a helical tooth 15, a dog tooth 16, and a stopper 17. And. The helical teeth 15 mesh with helical teeth of another gear that can be arranged radially outward, and the dog teeth 16 mesh with the sleeve teeth 21 when the sleeve 2 moves to the coupling position P1 (see FIG. 1). The lotus tooth 15 is an example of an external tooth. The sleeve teeth 21 are an example of first teeth, and the dog teeth 16 are an example of second teeth. The external teeth are not limited to the helical teeth 15 and may be flat teeth, for example. The sleeve teeth 21 and the dog teeth 16 can also be referred to as spline teeth, dog clutch teeth, or the like.

  The transmission gear 1 is composed of a single part, for example, by forging. Thus, for example, the main gear portion 8 having the hub 11, the flange portion 12, the ring portion 13, the helical teeth 15, the stopper 17, etc., and the clutch gear portion 9 having the protruding portions 14, the dog teeth 16, etc. are separate parts. Compared with the case where it comprises, cost is easy to be reduced.

  The hub 11 is located radially inward of the main gear portion 8. The hub 11 is formed in a cylindrical shape and surrounds the shaft 3 (see FIG. 1).

  The flange portion 12 protrudes outward in the radial direction from the hub 11. The width (thickness) along the axial direction of the flange portion 12 is smaller than the width along the axial direction of the hub 11 and the ring portion 13. In other words, the main gear portion 8 is provided with a concave portion 8a surrounded by the hub 11, the flange portion 12, and the ring portion 13 and recessed in the axial direction. The recess 8a is opened toward the sleeve 2 side, that is, in the X2 direction, and can accommodate the sleeve teeth 21. The recess 8a is formed in an annular shape.

  The ring portion 13 extends in the X2 direction along the hub 11 from the radially outer end of the flange portion 12. As shown in FIG. 2, a plurality of helical teeth 15 are provided on the outer periphery 13 a of the ring portion 13 at intervals in the circumferential direction. The outer periphery 13 a has an outer peripheral surface that is also called a tooth bottom of the lotus tooth 15.

  Further, for example, three stoppers 17 are provided on the inner periphery 13b of the ring portion 13 with an interval of 120 ° around the rotation axis Ax. Each of the plurality of stoppers 17 extends radially inward from the inner periphery 13b. Further, the inner periphery 13b faces the recess 8a. The inner periphery 13b has an inner peripheral surface also referred to as a side surface of the recess 8a.

  In addition, an inclined surface 13b1 is provided on the inner periphery 13b at a position shifted from the stopper 17 in the circumferential direction. As shown in the lower side of FIG. 1, the inclined surface 13b1 extends outward in the radial direction from the bottom surface 8a1 of the recess 8a toward the X2 direction.

  When the dog teeth 16 are formed by forging, a required space is required outside the dog teeth 16 in the radial direction. Like this embodiment, the recessed part 8a provided between the hub 11 and the ring part 13 is also the said space. If the stopper 17 is provided so as to face the dog teeth 16 in the radial direction, the concave portion 8a between the dog teeth 16 and the stopper 17 becomes narrow, which hinders the formation of the dog teeth 16. There is a fear. For this reason, when the ring portion 13 is arranged on the outer periphery, the transmission gear 1 expands in the radial direction. In this respect, according to the present embodiment, the dog teeth 16 and the stopper 17 are offset in the circumferential direction, so that it is possible to prevent the dog teeth 16 from being hindered, and the transmission gear 1 Increase in size can be suppressed. The ring portion 13 can also be referred to as a gear portion or the like.

  The protrusion 14 protrudes from the hub 11 toward the inclined surface 13b1 of the inner periphery 13b and extends in the circumferential direction. As shown in FIG. 2, the hub 11 is provided with, for example, three projecting portions 14 with a gap S1 therebetween in the circumferential direction. For example, when the sleeve 2 (see FIG. 1) moves to the coupling position P1, a part of the selection mechanism 10 such as a synchronizer ring is accommodated in the gap S1. The gap S1 is an example of a first gap.

  In addition, a plurality of dog teeth 16 are provided on the outer periphery 14 a of the protruding portion 14 at intervals in the circumferential direction. The outer periphery 14 a has an outer peripheral surface also called a tooth bottom of the dog tooth 16.

  The stopper 17 includes, for example, a surface 17a facing the X2 direction and a surface 17c facing both sides in the circumferential direction. As shown in FIGS. 1 and 3, the surface 17 a is flush with the surface of the ring portion 13 facing the X2 direction, and extends radially inward from the surface. The surface 17 a faces the contact portion 22 of the sleeve 2. The contact between the surface 17a and the contact portion 22 restricts the movement of the sleeve 2 in the X1 direction. Thereby, it is suppressed that the sleeve tooth | gear 21 contacts the bottom face 8a1 etc. of the recessed part 8a.

  Further, as shown in FIG. 2, the surface 17a is arranged side by side with the gap S1 in the radial direction. The width along the circumferential direction of the surface 17a is larger than the width along the circumferential direction of the gap S1. In other words, the central angle around the rotational axis Ax between the circumferential ends 17b of the surface 17a is larger than the central angle around the rotational axis Ax between the circumferential ends of the gap S1. Since the surface 17a can contact the contact portion 22 in a relatively large area, the surface pressure acting on the stopper 17 and the contact portion 22 tends to be smaller.

  The surface 17 c is provided at both ends 17 b in the circumferential direction of the stopper 17. The surface 17c is inclined with respect to the radial direction or the circumferential direction of the ring portion 13, and extends from the inner periphery 13b of the ring portion 13 toward the gap S1. The stopper 17 is formed in a trapezoidal shape that is convex toward the inside in the radial direction by the surfaces 17a and 17c in the line of sight in FIG. 2 (X direction). The surface 17c, for example, enters the recess 8a from the hub 11 via the oil passages 3a and 3b (see FIG. 1) of the shaft 3 and the oil passage 5a of the inner race 5, and the inner periphery 13b by centrifugal force. It is possible to guide the lubricating oil and the like flowing along the gap S1. The surface 17c is an example of a guide surface.

  As described above, in the present embodiment, for example, the transmission gear 1 is provided so as to be rotatable around the rotation axis Ax, and is located inwardly in the radial direction from the helical teeth 15 and the helical teeth 15. The dog tooth 16 that meshes with the sleeve tooth 21 of the sleeve 2 by the movement in the X1 direction along the axial direction of the sleeve 2 and the helical tooth 15 and the dog tooth 16 are positioned in the X2 direction opposite to the X1 direction. And a stopper 17 that restricts the movement of the sleeve 2 in the X1 direction by contact with the contact portion 22 of the sleeve 2.

  For example, when the stopper is positioned radially inward of the tooth bottom of the dog tooth 16 or the dog tooth 16, when the sleeve 2 comes into contact with the stopper, the radially inner portion of the sleeve 2 serves as the stopper. There is a possibility that the sleeve 2 is inclined with respect to the rotation axis Ax because the outer portion in the radial direction of the sleeve 2 is released due to contact. In that respect, according to the present embodiment, the stopper 17 is positioned between the helical teeth 15 and the dog teeth 16, that is, radially outward from the dog teeth 16. Since the one part abuts against the stopper 17 and the inclination of the sleeve 2 can be suppressed, the inclination of the sleeve 2 can be made smaller than in the conventional configuration.

  In this embodiment, for example, the hub 11 that surrounds the rotation axis Ax, the flange portion 12 that protrudes outward in the radial direction from the hub 11, and the radially outer end of the flange portion 12 from the X2 The stopper 17 protrudes radially inward from the inner periphery 13b of the ring portion 13. Therefore, according to this embodiment, for example, compared to the case where the stopper 17 is provided on the tooth bottom of the dog tooth 16, the contact area of the stopper 17 is easily secured, and consequently the surface acting on the stopper 17 and the contact portion 22. Pressure tends to be smaller.

  Moreover, in this embodiment, it protrudes toward the inner periphery 13b of the ring part 13 from the hub 11, for example, extends in the circumferential direction with a clearance S1 in the circumferential direction of the ring part 13, and has dog teeth 16 on each outer periphery 14a. , And the stopper 17 faces the gap S1 in the radial direction. Therefore, according to the present embodiment, for example, since the dog teeth 16 and the stopper 17 do not face in the radial direction, a space between the dog teeth 16 and the inner periphery 13b of the ring portion 13 is easily secured. Thereby, for example, when the dog teeth 16 are formed by forging, the dog teeth 16 are easily formed more smoothly or more accurately.

  In the present embodiment, for example, both end portions 17b in the circumferential direction of the stopper 17 are provided with surfaces 17c that are inclined with respect to the diameter of the ring portion 13 and extend from the inner periphery 13b of the ring portion 13 toward the gap S1. It has been. Therefore, according to the present embodiment, for example, the surface 17c can guide the lubricating oil or the like flowing along the inner periphery 13b of the ring portion 13 by the centrifugal force toward the gap S1, and thus in the gap S1 or the gap. Lubricity of a member arranged in the vicinity of S1 can be improved.

Second Embodiment
The transmission gear 1A according to the embodiment shown in FIG. 4 has the same configuration as the transmission gear 1 according to the first embodiment. Therefore, also according to this embodiment, the same result (effect) based on the same configuration as that of the first embodiment can be obtained.

  However, this embodiment is different from the first embodiment in that the stopper 17A faces the gap S2 in the radial direction as shown in FIG. The gap S2 is a space between two dog teeth 16 adjacent in the circumferential direction. The stopper 17A is formed in a curved surface that is convex inward in the radial direction as viewed in FIG. 4 (X direction). The shape of the stopper 17A is not limited to this example, and may be, for example, a trapezoidal shape or a polygonal shape. The gap S2 is an example of a second gap. Therefore, according to the present embodiment, for example, since the dog teeth 16 and the stopper 17A do not face in the radial direction, a space between the dog teeth 16 and the inner periphery 13b of the ring portion 13 is easily secured. Therefore, for example, when the dog teeth 16 are formed by forging, the dog teeth 16 are easily formed more smoothly or more accurately.

  An additional note is disclosed regarding the above-described embodiment.

A gear mechanism comprising: a transmission gear provided rotatably around a rotation center and having external teeth; and a sleeve movable along an axial direction of the rotation center and having a first tooth. ,
The transmission gear is positioned radially inward of the outer teeth, and second teeth that mesh with the first teeth of the sleeve by moving the sleeve in a first direction along the axial direction. When,
It is located between the external teeth and the second teeth, faces in a second direction opposite to the first direction, and moves the sleeve in the first direction by contact with the sleeve. A stopper to limit,
Having a meshing mechanism.

  As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example and is not intending limiting the range of invention. The above embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. The above embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. The present invention can be realized by configurations other than those disclosed in the above embodiments, and various effects (including derivative effects) obtained by the basic configuration (technical features) can be obtained. is there. In addition, the specifications of each component (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) should be changed as appropriate. Can do.

  DESCRIPTION OF SYMBOLS 1,1A ... Transmission gear, 2 ... Sleeve, 11 ... Hub, 12 ... Flange part, 13 ... Ring part, 13b ... Inner periphery, 14 ... Projection part, 14a ... Outer part, 15 ... Lotus tooth (external tooth), 16 ... Dog teeth (second teeth), 17, 17A ... Stopper, 17b ... Both ends (ends), 17c ... Surface (guide surface), 21 ... Sleeve teeth (first teeth), 22 ... Contact portion, Ax: rotation axis (center of rotation), C: circumferential direction, R: radial direction, S1: gap (first gap), S2: gap (second gap), X: axial direction, X1: first direction , X2 ... second direction.

Claims (4)

A transmission gear provided to be rotatable around a rotation center,
With external teeth,
A second tooth that is positioned radially inward of the rotation center relative to the outer teeth and meshes with the first teeth of the sleeve by movement of the sleeve in a first direction along the axial direction of the rotation center; ,
It is located between the outer teeth and the second teeth, faces in a second direction opposite to the first direction, and contacts the contact portion of the sleeve toward the first direction of the sleeve. A stopper to limit the movement of the
A gear for a transmission, comprising: A hub surrounding the rotation center;
A flange projecting outward in the radial direction from the hub;
A ring portion protruding in the second direction from the radially outer end of the flange portion and provided with the external teeth;
With
The transmission gear according to claim 1, wherein the stopper protrudes inward in the radial direction from an inner periphery of the ring portion. A plurality of protrusions projecting from the hub toward the inner periphery of the ring portion, extending in the circumferential direction with a first gap therebetween in the circumferential direction of the ring portion, and having the second teeth on each outer periphery A protrusion,
The transmission gear according to claim 2, wherein the stopper faces the first gap and the radial direction.   The circumferential end of the stopper is provided with a guide surface that is inclined with respect to the diameter of the ring portion and extends from the inner periphery of the ring portion toward the first gap. A gear for a transmission according to 1.

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