WO2017033781A1

WO2017033781A1 - Rotary shaft case

Info

Publication number: WO2017033781A1
Application number: PCT/JP2016/073801
Authority: WO
Inventors: 実神林
Original assignee: いすゞ自動車株式会社
Priority date: 2015-08-26
Filing date: 2016-08-12
Publication date: 2017-03-02
Also published as: JP2017044265A

Abstract

A transmission gear case 10 includes: a case body part 11 that accommodates at least a portion of an input shaft 40; a bearing support part 20 for supporting a bearing 31 that rotatably supports the input shaft 40; and a support wall 13 that connects the bearing support part 20 to the case body part 11 to support the bearing support part 20. When rotating, the input shaft 40 generates a thrust force in a predetermined direction. The support wall 13 has, at at least a portion of a connection section connected to the bearing support part 20, an inclined part 13a that is inclined so as to be closer to the shaft center of the rotary shaft at a position further in the predetermined direction.

Description

Rotating shaft case

The present invention relates to a rotating shaft case for housing at least a part of a rotating shaft.

A transmission case, which is an example of a rotating shaft case, accommodates an input shaft for inputting engine power and a shaft to which the power of the input shaft is transmitted.

For example, since one or more gears are connected to the shaft of the transmission, a thrust force (thrust in the axial direction of the shaft) is generated during rotation depending on the structure. The thrust force generated in the shaft is transmitted to the transmission case via a bearing that supports the shaft, a bearing support portion that supports the bearing, and the like, and generates vibration, noise, deformation, and the like.

As a technique for preventing vibration and noise generated in the transmission, for example, Patent Document 1 discloses a technique for suppressing the vibration transmitted to the transmission case by providing a bending flexible structure.

In addition, as a technique for reducing deformation and stress due to the thrust force generated in the differential shaft, for example, Patent Document 2 discloses a technique in which a peripheral region extending in the radial direction from the boss portion is formed in a corrugated shape with a uniform thickness. Is disclosed.

JP 2001-124187 A JP 2011-085206 A

For example, in the techniques disclosed in Patent Document 1 and Patent Document 2, vibration generated in the rotating shaft is absorbed by a flexible configuration so that it is not transmitted to the case. For this reason, the problem which the deformation | transformation by thrust force generate | occur | produces in the bearing connected to the rotating shaft, the member which supports a bearing, and its periphery is not solved.

Therefore, an object of the present disclosure is to provide a technique capable of improving the axial rigidity of the bearing support portion of the rotating shaft case and the periphery thereof.

In order to achieve the above-described object, a rotating shaft case according to an aspect of the present disclosure includes a case main body that accommodates at least a part of the rotating shaft, and a bearing support that supports a bearing that rotatably supports the rotating shaft. Shaft and a support wall that supports and supports the bearing support portion connected to the case body portion, and the rotation shaft generates a thrust force in a predetermined direction when rotated. The wall has an inclined portion that is inclined at least at a part of the connection portion connected to the bearing support portion so as to be closer to the axis center of the rotation shaft as it is positioned in a predetermined direction.

In the rotary shaft case described above, the wall thickness of the connection portion connected to the bearing support portion of the support wall may be thinner than the thickness of the bearing support portion in a predetermined direction.

In the above-described rotating shaft case, the rotating shaft is an input-side rotating shaft of a transmission to which the rotation of the engine is transmitted, and the support wall is one end with respect to the bearing that supports the input-side rotating shaft of the bearing support portion. You may make it have the inclination part connected to each of the outer surface of the other side near the other side and the outer surface near a side and the other end side with respect to a bearing.

The rotating shaft case further includes a driven rotating shaft that is rotated by transmission of the driving force from the input-side rotating shaft, and the driven rotating shaft generates less thrust force than the input-side rotating shaft. The bearing support portion can support a driven shaft bearing for supporting the driven rotary shaft, and the support wall is connected to an outer surface of a portion of the bearing support portion that supports the driven shaft bearing, You may make it further have the perpendicular | vertical part comprised by the surface perpendicular | vertical to a direction.

In the above-described rotating shaft case, the input-side rotating shaft may be supported above the driven rotating shaft.

Further, in the above rotating shaft case, the bearing support portion and the support wall may be integrally formed.

According to the present disclosure, it is possible to improve the axial rigidity of the bearing support portion of the rotary shaft case and the periphery thereof.

FIG. 1A is a front view of a transmission case shown as an example of a rotating shaft case according to an embodiment of the present disclosure. 1B is a cross-sectional view of the transmission case taken along line AA shown in FIG. 1A. FIG. 2A is a diagram illustrating a connection state of the support wall with respect to the bearing support portion according to the embodiment of the present invention. FIG. 2B is a diagram illustrating a connection state of the support wall to the bearing support portion according to the first modification of the present invention. FIG. 2C is a diagram illustrating a connection state of the support wall to the bearing support portion according to the second modification of the present invention. FIG. 2D is a diagram illustrating a connection state of the support wall with respect to the bearing support portion according to the third modified example of the present invention.

Hereinafter, a transmission case as an example of a rotating shaft case according to an embodiment of the present disclosure will be described based on the accompanying drawings. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

FIG. 1A is a front view of a transmission case as an example of a rotating shaft case according to an embodiment of the present invention.

The transmission case 10 is a case for housing at least a part of a shaft, a gear group and the like constituting the transmission. An engine (not shown) is disposed on the front side (front side in FIG. 1A) of the transmission case 10 in the vehicle.

The transmission case 10 includes a case body 11, a rib 12, a support wall 13, and a bearing support 20. The front side of the vehicle of the case body 11 is formed in a concave shape opened to the front side. A plurality of ribs 12 are arranged substantially radially in the case body 11 to ensure the rigidity of the transmission case 10.

The bearing support 20 rotatably supports a through hole 21 for supporting a bearing 31 that rotatably supports an input shaft 40 (input-side rotation shaft) of the transmission and a counter shaft (driven rotation shaft) 42. And a through hole 22 for supporting the bearing 32 (driven shaft bearing).

The bearing support portion 20 is disposed at the bottom of the concave portion of the case main body portion 11 on the front side of the vehicle. The bearing support portion 20 is connected to and supported by the case body 11 by the support wall 13. The transmission case 10 is integrally formed by casting, for example.

FIG. 1B is a cross-sectional view of the transmission case 10 along the line AA in FIG. 1A. FIG. 1B shows a state where a part of the structure of the transmission is attached to the transmission case 10.

The bearing 31 is supported in the through hole 21 of the bearing support portion 20. The bearing 31 rotatably supports an input shaft 40 to which engine rotation is input. A bearing 32 is supported in the through hole 22 of the bearing support portion 20. The bearing 32 supports the counter shaft 42 rotatably.

A front cover 25 for sandwiching the

bearings

31 and 32 with the bearing support 20 is attached to the front side of the bearing support 20.

The input main gear 41 is provided on the input shaft 40 so as to be integrally rotatable.

The counter shaft 42 is provided with an input counter gear 43 meshing with the input main gear 41 and a gear group (not shown) so as to be integrally rotatable.

A main shaft 44 that receives the driving force from the counter shaft 42 and transmits it to the driving wheel (not shown) is disposed on the same axis as the input shaft 40.

When the input shaft 40 rotates, a thrust force S is generated in the illustrated direction. The thrust force S is transmitted to the bearing support portion 20 through the bearing 31, for example. On the other hand, the countershaft 42 is configured and arranged in a gear group so as to prevent or reduce the generation of thrust force during rotation. Therefore, even if thrust force is generated, the thrust force S by the input shaft 40 is generated. Only a smaller thrust force is generated.

The bearing support portion 20 is connected to and supported by the case body 11 by the support wall 13. The support wall 13 has a wall thickness that is thinner than the thickness of the bearing support portion 20 in the front-rear direction. The support wall 13 includes, for example, an inclined portion 13a that is inclined so as to be closer to the axial center of the input shaft 40 as it is positioned on the thrust force S direction side (left side in the figure).

Next, the configuration of the support wall 13 and the connection state between the bearing support portion 20 and the support wall 13 will be described in detail.

FIG. 2A is a view showing a connection state of the support wall to the bearing support portion according to the embodiment of the present invention.

The portion of the support wall 13 connected from the outer surface near the upper portion of the through hole 21 of the bearing support portion 20 to the outer surface near the lower portion has a wave shape as a whole.

More specifically, the support wall 13 has an inclined portion 13 a connected to the outer surface near the upper side (one end side) of the through hole 21 of the bearing support portion 20. The inclined portion 13a is an inclined surface that is inclined so as to be closer to the axial center of the input shaft 40 as it is positioned on the thrust force S direction side. Further, the support wall 13 has an inclined portion 13 b connected to the outer surface near the lower side (the other end side opposite to the one end side) of the through hole 21 of the bearing support portion 20. The inclined portion 13b is an inclined surface that is inclined so as to be closer to the axial center of the input shaft 40 as it is positioned on the thrust force S direction side.

Further, the support wall 13 has a vertical portion 13c that is a plane perpendicular to the direction of the thrust force S and connected to the outer surface from the vicinity of the through hole 22 of the bearing support portion 20 to the lower side.

Next, the function and effect of the support wall 13 will be described.

First, a brief description will be given of a case where the support wall is configured by a plane perpendicular to the direction of the thrust force S and is connected to the bearing support portion 20. In this case, the thrust force S acts on the support wall as a bending force (bending force).

On the other hand, in the support wall 13 according to the present embodiment, the

inclined portions

13a and 13b are formed to be inclined so as to be closer to the axial center of the input shaft 40 as it is located on the thrust force S direction side as described above. Yes.

For this reason, when the thrust force S is generated, a part of the thrust force S acts on the

inclined portions

13a and 13b as a force (tension) for pulling the

inclined portions

13a and 13b. Here, it can be said that it is common to plate-like members such as the support wall 13, but acting on the tension rather than the bending force has less influence on the deformation of the member. For this reason, deformation of the support wall 13 can be reduced by a part of the thrust force S acting as tension. That is, the axial rigidity of the input shaft 40 of the transmission case 10 can be improved. According to this configuration, there is almost no increase in the weight of the transmission case 10.

Further, in the present embodiment, the connecting portion of the support wall 13 connected to the outer surface from the upper vicinity to the lower side of the through hole 22 of the bearing support portion 20 is not formed in a wave shape but is formed as a vertical portion 13c. The volume of the space below the inside (right side of the drawing) of the case 10 can be reduced, and the amount of lubricating oil to be stored below the inside can be suppressed.

Next, the transmission case 10 according to the first modification of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same function part as embodiment, and the overlapping description is abbreviate | omitted.

FIG. 2B is a view showing a connection state of the support wall to the bearing support portion according to the first modification of the present invention.

The support wall 51 according to the first modification has an inclined portion 51a connected to the outer surface corresponding to the vicinity of the center of the through hole 21 from the vicinity near the through hole 21 of the bearing support portion 20. The inclined portion 51a is an inclined surface that is inclined so as to be closer to the axial center of the input shaft 40 as it is positioned closer to the direction of the thrust force S. Further, the support wall 51 has an inclined portion 51 b connected to the outer surface corresponding to the vicinity of the lower portion of the through hole 21 from the vicinity of the center of the through hole 21 of the bearing support portion 20. The inclined portion 51b is an inclined surface that is inclined so as to be closer to the axial center of the input shaft 40 as it is positioned on the thrust force S direction side.

Next, the function and effect of the support wall 51 will be described.

When the thrust force S is generated, a part of the thrust force S acts as a tension on the

inclined portions

51a and 51b. Here, it can be said that it is commonly applied to a plate-like member such as the support wall 51. However, the effect on the deformation of the member is less when acting as a tension than a bending force. For this reason, deformation of the support wall 51 can be reduced by a part of the thrust force S acting as tension. That is, the axial rigidity of the input shaft 40 of the transmission case 10 can be improved. According to this configuration, there is almost no increase in the weight of the transmission case 10.

Next, a transmission case 10 according to a second modification of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same function part as embodiment, and the overlapping description is abbreviate | omitted.

FIG. 2C is a diagram showing a connection state of the support wall to the bearing support portion according to the second modification of the present invention.

The support wall 52 according to the second modification has an inclined portion 52a connected to the outer surface near the upper portion of the through hole 21 of the bearing support portion 20. The inclined portion 52a is an inclined surface that is inclined so as to be closer to the axial center of the input shaft 40 as it is positioned on the thrust force S direction side. Further, the support wall 52 has an inclined portion 52 b connected to the outer surface near the lower side of the through hole 21 of the bearing support portion 20. The inclined portion 52b is an inclined surface that is inclined so as to be closer to the axial center of the input shaft 40 as it is positioned closer to the direction of the thrust force S. Further, the support wall 52 has a vertical portion 52c connected to the bearing support portion 20 on a plane perpendicular to the direction of the thrust force S between the inclined portion 52a and the inclined portion 52b.

Next, the function and effect of the support wall 52 will be described.

inclined portions

52a and 52b. Here, it can be said that it is common to the plate-like member such as the support wall 52, but acting on the tension rather than the bending force has less influence on the deformation of the member. For this reason, deformation of the support wall 52 can be reduced by a part of the thrust force S acting as tension. That is, the axial rigidity of the input shaft 40 of the transmission case 10 can be improved. According to this configuration, there is almost no increase in the weight of the transmission case 10.

Next, a transmission case 10 according to a third modification of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same function part as embodiment, and the overlapping description is abbreviate | omitted.

FIG. 2D is a diagram showing a connection state of the support wall to the bearing support portion according to the third modification of the present invention. 2D is a cross-sectional view taken along line BB in FIG. 1A.

The support wall 53 according to the third modification has inclined

portions

53a and 53b connected to the left and right outer surfaces of the through hole 21 of the bearing support portion 20. The

inclined portions

53a and 53b are inclined surfaces that are inclined so as to be closer to the axial center of the input shaft 40 as they are positioned on the thrust force S direction side.

Next, the function and effect of the support wall 53 will be described.

When the thrust force S is generated, a part of the thrust force S acts as tension on the

inclined portions

53a and 53b. Here, it can be said that it is common to plate-like members such as the support wall 53, but acting on the tension rather than the bending force has less influence on the deformation of the member. For this reason, deformation of the support wall 53 can be reduced by a part of the thrust force S acting as tension. That is, the axial rigidity of the input shaft 40 of the transmission case 10 can be improved. According to this configuration, there is almost no increase in the weight of the transmission case 10.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present invention.

For example, in the above-described embodiment and modification, the inclined portion is inclined with respect to one of the vertical plane and the horizontal plane. However, the present invention is not limited to this, and the inclined portion is inclined with respect to the vertical and horizontal planes. Also good. For example, it is good also as an inclination part inclined along the radial direction centering on the central axis of the input shaft 40. FIG.

Further, in the above embodiment, the bearing support portion 20 and the support wall 13 are integrally molded. However, the present invention is not limited to this, and the bearing support portion 20 and the support wall 13 are molded separately. Then, they may be connected.

Further, in the above embodiment, the transmission case that houses the input shaft that receives the input of the driving force from the engine is taken as an example, but the present invention is not limited to this, and for example, the differential case that houses the drive shaft. The present invention can be applied to a rotating shaft case that houses a rotating shaft that generates a thrust force.

This application is based on a Japanese patent application (Japanese Patent Application No. 2015-166999) filed on August 26, 2015, the contents of which are incorporated herein by reference.

The rotating shaft case according to the present disclosure has an effect of improving the axial rigidity of the bearing support portion and its periphery, and can prevent the occurrence of vibration, noise, deformation, and the like accompanying the rotation of the rotating shaft. Useful in that it can.

DESCRIPTION OF SYMBOLS 10 Transmission case 11 Case main-body part 12 Rib 13

Support wall

13a, 13b Inclination part 13c Vertical part 20

Bearing support part

31, 32 Bearing

Claims

A case main body that accommodates at least a part of the rotation shaft; a bearing support for supporting a bearing that rotatably supports the rotation shaft; and a support that supports the bearing support by connecting the bearing support to the case main body. A rotating shaft case having a wall,
The rotating shaft is configured to generate a thrust force in a predetermined direction when rotated.
The support wall has at least a part of a connection portion connected to the bearing support part, and a rotating shaft case having an inclined portion that is inclined so as to be closer to the axis center of the rotating shaft as it is located on the predetermined direction side. .
The rotating shaft case according to claim 1, wherein a wall thickness of a connection portion of the support wall connected to the bearing support portion is thinner than a thickness of the bearing support portion in the predetermined direction.
The rotating shaft is an input-side rotating shaft of a transmission to which engine rotation is transmitted,
The support wall is provided on each of an outer surface in the vicinity of one end side with respect to the bearing supporting the input-side rotation shaft of the bearing support portion and an outer surface in the vicinity of the other end side opposite to the one end side with respect to the bearing. The rotating shaft case according to claim 1 or 2, comprising the inclined portion.
A driven rotary shaft that rotates by receiving a driving force from the input-side rotary shaft;
The driven rotating shaft has a smaller thrust force than the input-side rotating shaft,
The bearing support portion can support a driven shaft bearing for supporting the driven rotary shaft,
4. The rotation according to claim 3, wherein the support wall further includes a vertical portion that is connected to an outer surface of a portion of the bearing support portion that supports the driven shaft bearing and is configured by a surface perpendicular to the predetermined direction. Axis case.
The rotary shaft case according to claim 4, wherein the input rotary shaft is supported above the driven rotary shaft.
The rotary shaft case according to any one of claims 1 to 5, wherein the bearing support portion and the support wall are integrally molded.