JP2012219912A - Shaft with gear, and torque transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft with a gear, which can be assembled more efficiently by further reducing a length of the shaft while eliminating a nut for preventing a gear and a bearing device fitted from one terminal side of the shaft from being dropped, and a torque transmission device including the shaft with the gear.SOLUTION: A shaft with a gear includes a shaft S, a gear member G2 and a bearing member JS1. A shaft groove SM extending in a circumferential direction is formed at a position on an outer circumferential surface of the shaft between the gear member and the bearing member when the gear member and the bearing member are fitted into the shaft. The gear member is fitted from one end of the shaft, a gear lock member RS in a circular arc shape is fitted in a diameter direction to the shaft groove, and the bearing member is fitted from one end of the shaft. A portion of the gear lock member is protruded from the shaft groove, and at least a portion of an outer counter surface RM1 of the gear lock member is covered with a portion of an inner wheel of the bearing member.

Description

  The present invention relates to a geared shaft for transmitting rotational power from a rotational drive source to an output shaft via a plurality of gears and the like, and a rotational power transmission device including the geared shaft.

2. Description of the Related Art Conventionally, for example, in a vehicle transmission equipped with a continuously variable transmission, rotational power of an engine (rotation drive source) is transmitted to an axle serving as an output shaft via a reduction gear.
For example, in the example of the conventional transmission shown in FIG. 4, the rotational power from the rotational drive source is transmitted from the input gear teeth G2A attached to the shaft SE (input shaft) to the second gear teeth G2B, and further the second gear teeth G2B. Is transmitted from the first gear tooth G1B that rotates integrally with the output gear tooth G1A of the shaft SD (output shaft).
In the example of FIG. 4, the first gear having the first gear teeth G1B is formed on the shaft SS, and the second gear having the second gear teeth G2B is axially moved from one end of the shaft SS (for spline fitting). It is inserted. Further, after the bearing device JS1 is fitted from one end of the shaft SS, a nut NT is tightened to the end of the one end of the shaft SS, and the fitted second gear and the bearing device JS1 are fixed so as not to come off. . The reason why the fixing is necessary is that, when using the engine brake or the like, when the rotational power is transmitted from the wheel side (shaft SD side) to the engine side (shaft SE side), the shaft SS This is because a load for moving the second gear (the gear having the second gear teeth G2B) is applied to the one end side.

For example, in the conventional technique described in Patent Document 1, in FIG. 12 of Patent Document 1, a nut that prevents a gear, a bearing device, or the like from coming off at the right end portion of the first intermediate shaft 40 that rotates about the second axis CL2. Is tightened.
Further, for example, in the conventional technique described in Patent Document 2, in FIG. 2 of Patent Document 2, a nut for preventing the gears G2 to G5 from coming off is fastened to the left end portion of the shaft 2a.

JP 2007-1483 A Japanese Utility Model Publication No. 60-65452

In the prior art described in Patent Document 1 and Patent Document 2, a nut for preventing the fitted gear and the bearing device from coming off is required, and thus the length of the screw groove for tightening the nut is required. And the axial length of the shaft becomes longer. In addition, the operation of forming the thread groove and the operation of tightening the nut are necessary, which is very laborious.
The present invention was devised in view of such points, and the length of the shaft is further increased while omitting a gear fitted from one end of the shaft and a nut that prevents the bearing device from coming off. It is an object of the present invention to provide a geared shaft that can be shortened and assembled more efficiently and a rotational power transmission device including the geared shaft.

In order to solve the above problems, the geared shaft and the rotational power transmission device according to the present invention take the following means.
First, according to a first aspect of the present invention, there is provided a shaft, a gear member having a through hole fitted along the axial direction of the shaft from one end of the shaft, and one end of the shaft into which the gear member is fitted. And a bearing member having an inner ring fitted along the axial direction.
The outer circumferential surface of the shaft extends in the circumferential direction at a position between the gear member and the bearing member in the axial direction when the gear member and the bearing member are fitted into the shaft. A shaft groove is formed.
Then, the gear member is fitted along the axial direction from one end of the shaft, and a gear lock member having an arc shape from the radial direction orthogonal to the axial direction is fitted into the shaft groove, and the one end of the shaft The bearing member is fitted along the axial direction from the shaft, and a part of the gear lock member protrudes outward in the radial direction from the shaft groove toward the outside in the radial direction, and the gear At least a part of the outer facing surface which is a surface of the lock member and faces the outward radial direction is covered with a part of the inner ring.

According to the first aspect of the present invention, the gear lock member is provided (fitted) in the shaft groove formed in the circumferential direction of the shaft, and the gear member moves to the one end side of the shaft by the gear lock member. To restrain it. Since at least a part of the outer facing surface of the gear lock member is covered with a part of the inner ring of the bearing member, the gear lock member is held so as not to come off in the outward radial direction.
For this reason, neither a nut nor a thread groove for the nut is required, and the length of the shaft can be further shortened. Further, it is not necessary to form a screw groove for the nut nor to tighten the nut, and it is only necessary to fit the gear lock member into the shaft groove and the bearing device, so that the assembly can be efficiently performed.

Next, a second invention of the present invention is the geared shaft according to the first invention, wherein the inner ring is a surface facing the axial direction and facing the gear lock member. On the outer peripheral side, a bearing convex portion having an inner diameter larger than the outer diameter of the gear lock member and convex with respect to the gear lock member side is formed.
And at least one part of the said outer side opposing surface is covered with the said bearing convex part.

  According to the second aspect of the invention, it is possible to easily realize a specific restricting shape (shape on the bearing member side) that holds the gear lock member so as not to come out in the outward radial direction.

Next, a third aspect of the present invention is the geared shaft according to the second aspect of the present invention, wherein the gear lock member has an inner peripheral side of the end surface of the gear lock member that is a surface facing the bearing end surface. A gear lock member convex portion having a step outer diameter smaller than the inner diameter of the bearing convex portion and having a convex shape with respect to the bearing end face is formed.
And at least one part of the outer peripheral surface of the gear lock member convex part is covered with the bearing convex part.

  According to the third aspect of the invention, a specific restricting shape (a shape on the gear lock member side) that holds the gear lock member so as not to come out in the outward radial direction can be easily realized.

Next, a fourth aspect of the present invention is a geared shaft according to the first aspect, wherein the bearing end surface is a surface facing the axial direction in the inner ring and facing the gear lock member. Is formed with an inclined bearing surface, which is an inclined surface whose inner diameter gradually increases from the inner diameter side toward the outer diameter side.
And at least one part of the said outer side opposing surface is covered with the said bearing inclined surface.

  According to the fourth aspect of the invention, it is possible to easily realize a specific restriction shape (a shape on the bearing member side) that holds the gear lock member so as not to come out in the outward radial direction.

Next, a fifth invention of the present invention is the geared shaft according to the fourth invention, wherein the bearing on the end face of the gear lock member, which is a surface facing the bearing inclined surface of the gear lock member, is provided on the gear lock member. A gear lock member inclined surface which is an inclined surface along the inclination of the inclined surface is formed.
And at least one part of the said gear lock member inclined surface is covered with the said bearing inclined surface.

  According to the fifth aspect of the invention, it is possible to easily realize a specific restricting shape (shape on the gear lock member side) that holds the gear lock member so as not to come out in the outward radial direction.

  Next, a sixth invention of the present invention is a rotational power comprising a geared shaft according to any one of the first to fifth inventions, and a housing in which the geared shaft is rotatably assembled. A gear having an outer diameter different from the outer diameter of the gear teeth of the gear member is provided on the outer peripheral surface of the shaft at a position aligned in the axial direction with respect to the gear member of the geared shaft. A shaft side gear having teeth is formed, and the shaft and the gear member rotate together.

  According to the sixth aspect of the invention, the nut that prevents the gear member and the bearing member fitted from the one end side of the shaft from coming off is omitted while the axial load received from the two gears is received by the gear lock member. Thus, the length of the shaft can be shortened and the space can be saved more than before.

Using the bearing device JS1 having the shape of the first embodiment and the snap ring RS, the second gear G2 and the bearing device JS1 are formed from one end of the shaft S on which the first gear G1 is formed, and the shaft S It is a figure explaining the procedure which attaches snap ring RS from a diameter direction. It is a figure explaining 1st Embodiment (A) and 2nd Embodiment (B) of the control shape which prevents snap ring RS slipping out in an outer diameter direction. It is a figure explaining 3rd Embodiment (A) and 4th Embodiment (B) of the control shape which prevent snap ring RS slipping out in an outer diameter direction. In the conventional transmission, it is a figure explaining the assembly | attachment state of shaft SS in which the 1st gear which has the 1st gear tooth G1B was formed, the 2nd gear which has the 2nd gear tooth G2B, bearing device JS1, JS2, and nut NT. .

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. FIG. 1 is a diagram illustrating an example of a procedure for assembling the second gear G2, the snap ring RS, and the bearing device JS1 to one end of the shaft S on which the first gear G1 is formed in the geared shaft 1 of the present invention. is there. 1A to 1D are cross-sectional views along the direction of the rotation axis ZS.
2 (A) and 2 (B) and FIGS. 3 (A) and 3 (B) are enlarged views of the periphery of the snap ring RS in FIG. 1 (D), and in the bearing device JS1 (and the snap ring RS). The 1st-4th embodiment of a control shape is shown. In FIGS. 2A and 2B and FIGS. 3A and 3B, the gaps between the respective members are greatly illustrated in order to clarify the portions and surfaces indicated by the respective symbols.

● [Configuration of geared shaft 1 (FIG. 1 (D))]
As shown in FIG. 1D, the geared shaft 1 in the present embodiment includes a shaft S, a second gear G2 (corresponding to a gear member), a bearing device JS1 (corresponding to a bearing member), a snap ring RS (gear). Equivalent to a lock member). In the geared shaft 1 described in the present embodiment, an example is shown in which the bearing device JS1 is fitted into one end of the shaft S in the axial direction and the bearing device JS2 is fitted into the other end.
The second gear G2 has a through hole that is fitted along the axial direction from one end of the shaft S.
In addition, the bearing device JS1 includes a plurality of inner rings that are fitted in the axial direction from one end of the shaft S, an outer ring that is arranged so as to cover the outer periphery of the inner ring, and a space between the inner ring and the outer ring. And rolling elements.
Further, on the outer peripheral surface of the shaft S, when the second gear G2 and the bearing device JS1 are fitted into the shaft S, a position between the second gear G2 and the bearing device JS1 in the axial direction is provided in the circumferential direction. A shaft groove SM (see FIG. 1 (B)) is formed.
The snap ring RS has an arc shape and is fitted into the shaft groove SM from the radial direction orthogonal to the axial direction.

● [Structure in which the second gear G2 does not come off to one end and the assembly procedure (Fig. 1)]
As shown in FIG. 1A, the shaft S has a first gear having a first gear tooth G1B having a first outer diameter on a part of the rotation axis ZS in the axial direction (in this case, the other end side). G1 (corresponding to the shaft side gear) is formed.
Further, the second gear G2 is formed with second gear teeth G2B having a second outer diameter different from the first outer diameter, and the second gear G2 has a cylindrical shape for fitting into the shaft S. A groove for spline fitting is formed on the inner peripheral surface.
Then, the second gear G2 is fitted from the one end side in the axial direction of the shaft S (in this case, one end of the shaft S is inserted into the second gear G2), and aligned in the axial direction with respect to the first gear G1. The second gear G2 is fixed at the position. In the fitting portion between the second gear G2 and the shaft S, grooves are formed on the inner peripheral surface of the second gear G2 and the outer peripheral surface of the shaft S, respectively, so that the first gear G1 and the first gear G1 The second gear G2 and the second gear G2 are fitted so as to rotate together.
1A shows an example in which the bearing device JS2 is press-fitted into the other end of the shaft S, but the bearing device JS2 is press-fitted in any step of FIGS. You may do it.

In the first step, as shown in FIG. 1B (see also FIGS. 2A and 2B), it is the surface on the one end side of the second gear G2, and is in the axial direction (the direction of the rotation axis ZS). The snap ring RS is fitted into the shaft groove SM formed on the outer peripheral surface of the shaft S at a position adjacent to the second gear end surface G2M, which is a surface orthogonal to ().
The shaft groove SM is formed continuously or intermittently in the circumferential direction. When the snap ring RS is fitted into the shaft groove SM, the snap ring RS protrudes in the outer diameter direction. That is, when the second gear G2 tries to move to one end side of the shaft S (when receiving a load in the direction in which the second gear comes off), the second gear G2 hits the protruding portion of the snap ring RS, It is restrained to move to the side.
The snap ring RS has an arc shape (a part of a ring), and one or a plurality of the snap rings RS are fitted in the shaft groove SM.
It should be noted that the snap ring RS is pulled out in the direction toward the outside in the radial direction (hereinafter referred to as the outward radial direction) only by being fitted in the shaft groove SM. Therefore, using the bearing device JS1 that is press-fitted in the next step, at least one of the outer facing surfaces that is the surface facing the outward radial direction in the snap ring RS so that the snap ring RS does not come off in the outward radial direction. The portion is covered with respect to the outward radial direction by a part of the inner ring of the bearing device JS1 (details will be described in first to fourth embodiments described later).
Further, when the snap ring RS fitted in the shaft groove SM receives an axial load from the second gear G2 (a load in a direction toward one end of the shaft S), the axial load is received by the shaft groove SM. Therefore, the axial load is not transmitted to the bearing device JS1.

In the next step, as shown in FIG. 1C (see also FIGS. 2A and 2B), the bearing device JS1 is press-fitted from one end side of the shaft S.
The bearing end surface JSM facing the second gear end surface G2M in the annular portion (in this case, the inner ring JSN) of the bearing device JS1 is formed with a restriction shape that prevents the snap ring RS from coming off in the outward radial direction. By this restriction shape, the snap ring RS is held in the shaft groove SM without coming out in the outward radial direction. Details of the restriction shape will be described later.
FIG. 1 (D) shows the geared shaft 1 that has been assembled. The axial length L1 (in this case, the length from the end surface of the second gear G2 to the end surface of the shaft S) is less than the conventional shaft SS shown in FIG. It ’s getting shorter.

● [Example of restriction shape that prevents snap ring RS from coming off in the outward radial direction (FIGS. 2 and 3)]
Next, an example of the restriction shape will be described with reference to FIGS. 2 (A) and 2 (B) and FIGS. 3 (A) and 3 (B). 2A shows the first embodiment of the restriction shape, FIG. 2B shows the second embodiment of the restriction shape, and FIG. 3A shows the third embodiment of the restriction shape. FIG. 3B shows a fourth embodiment of a regulation shape.

[First Embodiment of Restricted Shape (FIG. 2A)]
First, the first embodiment shown in the example of FIG.
A bearing recess JSB having an inner diameter larger than the outer diameter of the snap ring RS and having a concave shape on the side of the snap ring RS in the axial direction is formed on the inner peripheral side of the bearing end surface JSM facing the second gear end surface G2M. ing.
A bearing convex portion JSA that is convex toward the snap ring RS in the axial direction is formed on the outer peripheral side of the bearing concave portion JSB (the outer peripheral side of the bearing end surface JSM).
The bearing device JS1 is press-fitted (fitted) so that the bearing convex portion JSA covers at least a part of the outer peripheral surface RM1 (corresponding to the outer facing surface) of the snap ring RS in the outward radial direction. .

[Second Embodiment of Restricted Shape (FIG. 2B)]
Next, a second embodiment shown in FIG. 2B will be described.
The inner peripheral side of the snap end surface RSM, which is the end surface of the snap ring facing the bearing end surface JSM, has a step outer diameter that is smaller than the outer diameter of the bearing end surface JSM, and protrudes toward the bearing end surface in the axial direction. A snap projection RMA (corresponding to a gear lock member projection) is formed.
Further, on the outer peripheral side (the outer peripheral side of the snap end surface RSM) of the snap convex portion RMA, a snap concave portion RMB is formed which is concave on the bearing end surface side in the axial direction.
A bearing recess JSB having an inner diameter larger than the step outer diameter of the snap projection RMA and having a concave shape on the side of the snap end surface RSM in the axial direction is formed on the inner peripheral side of the bearing end surface JSM.
A bearing convex portion JSA that is convex toward the snap end surface RSM in the axial direction is formed on the outer peripheral side of the bearing concave portion JSB (the outer peripheral side in the bearing end surface JSM).
The bearing device JS1 is press-fitted so that the bearing convex portion JSA covers at least a part of the outer peripheral surface RM2 (corresponding to the outer facing surface) of the snap convex portion RMA in the outward radial direction.

[Third Embodiment of Restricted Shape (FIG. 3A)]
Next, a third embodiment shown in FIG.
A bearing inclined surface JM3, which is an inclined surface whose inner diameter gradually increases from the inner diameter side toward the outer diameter side, is formed on the bearing end surface JSM facing the second gear end surface G2M. The shape of the bearing inclined surface JM3 may be an arc-shaped inclined surface as shown in the example of FIG. 3A or a linear inclined surface.
The bearing device JS1 is press-fitted (fitted) so that the bearing inclined surface JM3 covers at least a part of the outer peripheral surface RM1 (corresponding to the outer facing surface) of the snap ring RS in the outward radial direction. .

[Fourth Embodiment of Restricted Shape (FIG. 3B)]
Next, a fourth embodiment shown in FIG.
A bearing inclined surface JM3 is formed on the bearing end surface JSM facing the second gear end surface G2M, as in the third embodiment.
Further, a snap ring inclined surface RM3 (corresponding to a gear lock member inclined surface) which is an inclined surface along the inclination of the bearing inclined surface JM3 is formed on the snap end surface RSM which is an end surface of the snap ring facing the bearing end surface JSM. ing.
The bearing device JS1 is press-fitted (fitted) so that the bearing inclined surface JM3 covers at least a part of the snap ring inclined surface RM3 (corresponding to the outer facing surface) in the outward radial direction.
The shape of the fourth embodiment is more preferable as compared with the shape of the third embodiment, because the portion where the inner ring JSN and the snap ring RS come into contact is in surface contact, and the inner ring JSN is hardly damaged.

In the structures described in the first to fourth embodiments, all of the outer peripheral surface RM1 of the outer diameter of the snap ring RS, the outer peripheral surface RM2 of the snap convex portion RMA, and the bearing convex portion JSA of the bearing device JS1. The inner peripheral surface JM1, the bearing inclined surface JM3, and the snap ring inclined surface RM3 are formed continuously or intermittently in the circumferential direction.
Thus, the snap ring RS is held by the inner peripheral surface of the bearing convex portion JSA or the bearing inclined surface JM3 so as not to come out in the outward radial direction.
As described above, the geared shaft 1 described in the present embodiment does not require a nut groove and a nut, and the axial length of the shaft S can be further shortened. Further, the nut groove forming operation and the nut tightening operation are unnecessary, and it is only necessary to insert the bearing device JS1 after the snap ring RS is fitted into the shaft groove SM. It can be time.
Further, it is possible to easily realize a rotational power transmission device in which the geared shaft 1 described in the present embodiment is assembled so as to be rotatable in the housing.

The geared shaft 1 of the present invention is not limited to the appearance, configuration, structure, shape, and the like described in the present embodiment, and various modifications, additions, and deletions are possible without departing from the spirit of the present invention.
The geared shaft 1 of the present invention is not limited to a vehicle transmission, and can be applied to various geared shafts that transmit rotational power from a rotational drive source to an output shaft.
In the description of the present embodiment, as an example of the bearing device JS1, the tapered roller bearing including the inner ring JSN, the tapered roller JST, and the outer ring JSG as shown in FIGS. 2 (A) and 2 (B) is described. It is not limited to a bearing device having rollers, and any bearing device having an annular inner ring may be used.

1 Geared shaft G1 1st gear G1B 1st gear teeth G2 2nd gear G2B 2nd gear teeth G2M 2nd gear end surface JM3 Bearing inclined surface JS1, JS2 Bearing device JSA Bearing convex portion JSB Bearing concave portion JSM Bearing end surface RM3 Snap ring inclined Surface (Gear lock member inclined surface)
RMA Snap convex part RMB Snap concave part RS Snap ring RSM Snap end face S Shaft SM Shaft groove ZS Rotating shaft

Claims (6)

A shaft,
A gear member having a through-hole fitted along the axial direction of the shaft from one end of the shaft;
In a shaft with gear comprising: a bearing member having an inner ring fitted along the axial direction from one end of the shaft into which the gear member is fitted,
The outer circumferential surface of the shaft extends in the circumferential direction at a position between the gear member and the bearing member in the axial direction when the gear member and the bearing member are fitted into the shaft. A shaft groove is formed,
The gear member is fitted along the axial direction from one end of the shaft, and a gear lock member having an arc shape from the radial direction orthogonal to the axial direction is fitted into the shaft groove, and the gear lock member is inserted from the one end of the shaft. The bearing member is fitted along the axial direction,
A part of the gear lock member protrudes in an outward radial direction that is a direction toward the outside in the radial direction from the shaft groove,
At least a part of the outer facing surface which is a surface of the gear lock member and faces the outward radial direction is covered with a part of the inner ring,
Geared shaft. The geared shaft according to claim 1,
The inner ring has a larger inner diameter than the outer diameter of the gear lock member on the outer peripheral side of the bearing end surface that is a surface facing the gear lock member that faces the axial direction, and is on the gear lock member side. The bearing convex part which becomes convex with respect to is formed,
At least a part of the outer facing surface is covered with the bearing convex portion,
Geared shaft. The geared shaft according to claim 2,
On the inner peripheral side of the gear lock member end surface, which is the surface facing the bearing end surface of the gear lock member, has a stepped outer diameter that is smaller than the inner diameter of the bearing convex portion, and with respect to the bearing end surface side. The convex part of the gear lock member that is convex is formed,
At least a part of the outer peripheral surface of the gear lock member convex portion is covered with the bearing convex portion,
Geared shaft. The geared shaft according to claim 1,
A bearing inclined surface that is an inclined surface whose inner diameter gradually increases from the inner diameter side toward the outer diameter side is formed on the bearing end surface that is a surface facing the gear lock member in the axial direction of the inner ring. Formed,
At least a part of the outer facing surface is covered with the bearing inclined surface,
Geared shaft. The geared shaft according to claim 4,
A gear lock member inclined surface that is an inclined surface along an inclination of the bearing inclined surface is formed on an end surface of the gear lock member that is a surface facing the bearing inclined surface of the gear lock member,
At least a part of the gear lock member inclined surface is covered with the bearing inclined surface,
Geared shaft. A geared shaft according to any one of claims 1 to 5,
A housing in which the geared shaft is rotatably assembled, and
The shaft side gear having gear teeth having an outer diameter different from the outer diameter of the gear teeth of the gear member on the outer peripheral surface of the shaft, which is located in the axial direction with respect to the gear member in the geared shaft. Is formed, and the shaft and the gear member rotate together.
Rotational power transmission device.

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