JPS59144856A - Construction for supporting input shaft of final speed reducer - Google Patents

Abstract

PURPOSE:To facilitate the assembly of an input shaft to a housing, by providing a member which supports the drive pinion of the input shaft at the side of a differential and does not belong to the housing and by assembling the input shaft to the housing at the side of the differential. CONSTITUTION:A member 31 supports the drive pinion 2 of an input shaft 1 at the side of a differential and comprises a bearing part 31a and a secured part 31b formed integrally and continuously to the bearing part. The secured part 31b is clamped on a gear carrier 29 by bolts 32 as the bearing part 31a is placed among the gear carrier 29, a downwardly extending part 30 and a roller bearing 17 fitted on the auxiliary part 4 of the input shaft 1, so that the drive pinion 2 on the input shaft 1 at the side of the differential is supported rotatably to a housing 24. Since the input shaft 1 is assembled to the housing 24 at the side of the differential, the assembly is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input shaft of a final reduction gear, and particularly to an input shaft support structure in which both sides of a drive pinion of the input shaft are rotatably supported by a housing.

For example, the input shaft support structure of the subordinate final reduction gear is as follows.
There is something like the one shown in Figure 1. That is, 1 in the figure is an input shaft to the final reduction gear, and this input shaft 1 includes a drive pinion 2 that constitutes one member of a hypoid gear,
The drive pinion 2 is comprised of a main shaft portion 3'Et and a counter shaft portion 4 that are continuous on both sides in the axial direction. The main shaft portion 3 has a large diameter portion a1, a medium diameter portion 6b, and a small diameter portion 6C sequentially from the binion 2 side, and the large diameter portion 6a is fitted with two tenosi roller bearings 5, and a nut 6 and a washer. 7 prevents both bearings 5 from falling off. The outer rings of both bearings 5 are held by a holder 8, and a collar 9 is still completely interposed between the inner rings of both bearings 5. Further, a girder traction gear 10 is spline-coupled to the medium diameter portion 3b of the main shaft portion 6, and a (ri)
, an idler gear 13 is rotatably held on the outside via a cylindrical shaft 11 fitted onto the outside and a large number of needle bearings 12 arranged around the outer periphery of the cylindrical shaft 11).

Such an input shaft 1 (d1 main shaft part 30 large diameter part 6a and small diameter part 6
In order to transmit large torque, the main shaft part 3 is supported not only in two places, but also in three places, including four subshaft parts, on the outer ring 14 of the final reduction gear MA. The large diameter portion 6a is supported by the housing 14 via the holder 8 and spacer 15, and the small diameter portion 6c is
The housing 14 is connected via a bearing 16 fitted externally to this.
The subshaft 4 is further supported by the housing 14 via a roller bearing 17 fitted onto the subshaft 4. The housing 14 consists of a gear case 18 and a gear carrier 19 separate from the gear case 18, which are tightened and fixed together by bolts 20. moreover,
In the gear carrier 19, a support portion 19a for rotatably supporting the subshaft portion 4 of the input shaft 1 is projected toward a differential gear (not shown) that is rotationally driven integrally with a ring gear 21 that meshes with the pinion 2. The support portion 19 is provided with a countershaft portion 4 via the 11-ra bearing 17.
is supported. -f, :F? , 22 in the figure is a bolt for fixing the holder 8 to the gear carrier 19,
26 is a retaining ring that prevents the roller bearing 17 from falling off.

In this way, the input shaft 1 is fitted by externally fitting two tapered roller bearings 5, a boulder 8 and a collar 9 onto the large diameter portion 3a of the main shaft portion, and attaching these to the nut 6.
And the washer 7 prevents it from being pulled out. Next, the holder 8 is fixed to the gear carrier 19 with bolts 22 via the spacer 15 while fitting the counter shaft portion 4 of the input shaft 1 into the roller bearing 17 that has been fitted in advance into the support portion 19a of the gear carrier 19. do. Thereafter, the gear carrier 19 is brought close to the gear case 18, and while the main shaft part of the input shaft 1 is inserted into the gear case 18, the reduction gear 10, the cylindrical shaft 1'1 and the needle bearing 12 are attached to the main shaft part 6 in advance. The assembled idler gear 13 is externally fitted, and then the tip of the main shaft section 6 is internally fitted into the bearing 16, which has been previously installed in the gear case section 8. After that, Pol)2
The input shaft 1 is rotatably supported by the housing 14 by fixing the gear case 18 and the gear carrier 19 with each other.

However, in such a conventional input shaft support structure of a final reduction gear, in order to support the differential gear (MU 3j) of the drive pinion 2 of the input shaft 1,
The support portion 19a is integrally provided with the gear carrier 19, and the hole diameter of the support portion 19a is smaller than the maximum outer diameter of the pinion 2. Therefore, when assembling this final reduction gear, if it is not possible to assemble the input shaft 1 from the differential gear (IB) to the housing 14, attach the input shaft 1 to the gear carrier 19 in advance and use a wire, crane, etc. gear carrier 19
is lifted to face the gear case 18, and then, while inserting the main shaft portion 3 of the input shaft 1 into the gear case 18, the reduction gear 10 etc. are externally fitted onto the main shaft portion 3, and further,
It is necessary to fit the tip of the main shaft portion 3 into the bearing 16 and perform the assembly work in such a positive order, resulting in a problem that the workability of silk finishing is poor.

The present invention has been made by focusing on such conventional problems, and includes configuring the differential gear side supporting portion of the drive pinion of inputs 1 and 11 of the housing as a separate part from the housing. The purpose is to solve the above problem by making it possible to attach the input shaft to the housing from the differential gear side.

The present invention will be explained below based on the drawings.

FIGS. 2 and 3 are diagrams showing an embodiment of the present invention.

First, to explain the configuration, in the figure, 1 is the input shaft, 2 is its drive pinion, 3 is the main shaft, 3a is the large diameter part, 4 is the subshaft, and 5 is the large diameter part 6a, which is rotatable. A supporting taper roller bearing, 6 a nut for preventing the taper roller bearing 5 from falling off, 7 a washer, 9a a collar interposed between both tapered roller bearings 5, 17 rotating the sub 11i1 part 4 Roller bearing for free support, 21 is drive pinion 2
The ring gear 26 meshing with the roller bearing 17 is a retaining ring for preventing the roller bearing 17 from falling off, and these are similar to those of the conventional example shown in FIG.

Furthermore, in the figure, 24 is a housing. This housing 24 includes a gear case portion 28 and a gear case portion 28.
The side wall 26 that partitions the gear case part 28 and the gear carrier part 29 is provided with a host part 27.
Bearing seats 27a are formed on both sides of 70. Two tapered roller bearings 5 that rotatably support the large diameter portion 3a of the main shaft 11 portion 3 of the input shaft 1 are inserted into the bearing seats 27a, respectively. Furthermore, boss part 2
7 differential gear (not shown) side (left side in the diagram)
is provided with a leg portion 30 that protrudes toward the differential gear side at a portion that avoids contact with the ring gear 21, and inside this leg portion 30 is the bearing F! Form a circular arc surface with the same diameter that continues to $27a.

Further, reference numeral 61 in the figure represents a support member, and this support member 61 constitutes a support portion of the drive pinion 2 of the input shaft 1 on the side of the gear L/assembly gear. The support portion 61 consists of a bearing portion 31a and a fixed portion 31b integrally formed continuously with the bearing portion 31a, and the roller bearing 17 is fitted into the central portion of the bearing portion 31a. hole 31
c A; T is provided 1, and the outer shape of the bearing portion 31a is such that it fits into the circular arc surface of the bearing seat 27a and does not come into contact with the ring gear 21. The support member 61 is fixed to the housing 24 by tightening the fixing part 31b with a bolt 62.
1 and a roller bearing 17, the subshaft portion 4 of the input shaft 1 is rotatably supported with respect to the housing 24. In addition, 66 in the figure is a spacer, and this spacer 36
By adjusting the thickness of the ring gear 21, the meshing state between the drive pinion 2 and the ring gear 21 is adjusted. The rest of the structure is the same as the conventional example shown in FIG.

Next, the action will be explained.

To assemble 10 sets of input shafts in this final reduction gear, first, the super roller bearing 5 on the differential gear side is fitted into the housing 24, the spacer 36 is fitted onto the main shaft portion 6 of the input shaft 1, and the sub-shaft A roller bearing 17 is fitted onto the portion 4 and is prevented from being removed by a retaining ring 26. After that, while inserting the main shaft part 6 side of the input shaft 1 into the housing 24 from the differential gear side, the collar 9, the other tapered roller bearing 5, the washer 7, the nut 6, and the reduction gear are inserted into the main shaft part B. The gear 10 and the idler gear 16 to which the cylindrical shaft 11 and the needle bearing 12 are attached are sequentially fitted or screwed together, and the tip of the main shaft part B is previously inserted into the housing 2.
4 is inserted into the bearing 16 inserted into the bearing 16. Then, by tightening the nut 6, the preload of both tapered roller bearings 7 is adjusted.

Next, the bearing part 31a of the support member 61 is interposed between the roller bearing 17 attached to the subshaft part 4 of the input shaft 1 and the quadrupled part formed by the gear carrier part 29 and the leg part 60. , the identification part 31b is fixedly fixed to the gear carrier part 29 by bolts 62. With this, input shaft 1
The differential gear side of the drive pinion 2 is rotatably supported by the housing 24.

In this case, since the input shaft 10 can be assembled to the housing 24 from the differential gear side,
As in the conventional example shown in FIG.
It is not necessary to form each separately, but they can be formed continuously and integrally, reducing the number of parts and simplifying the structure, and greatly improving ease of assembly. can be improved. Moreover, since the support member 31 that supports the differential gear side of the drive pinion 2, that is, the countershaft portion 4, is fitted into the gear carrier portion 29, the rigidity of this support portion can be ensured, and a large torque can be generated. Communication can be carried out.

FIGS. 4 and 5 show other embodiments of the invention.

In this fifteenth example, the support member 41 is directly fixed to the boss portion 37 of the housing 34. That is, this support member 41 includes a bearing portion 41a having a hole 41c into which the roller bearing 17 is fitted, and a bearing seat 37 formed in the boss portion 67. A fixing part 41b having an arc-shaped protrusion 41d fitted inside the fixing part 4
lb and a connecting portion 41c integrally formed to connect the bearing portion 41a, and this connecting portion 41e is provided with a receptacle opening 41f for ensuring engagement between the drive pinion 2 and the link gear 21. . According to this example, the leg portion 3 of the housing 24 in the above embodiment
Since 0 can be eliminated, the structure of the housing 64 can be made much simpler. The other configurations and functions are similar to those of the embodiment described above, and the same effects as those of the embodiment described above can also be obtained by configuring it in this way.

Note that this invention, like the conventional example shown in FIG.
Of course, it is possible to use the housing 14 in which the gear case 18 and the gear carrier 19 are separate bodies.

As explained above, in this invention, both sides of the drive pinion of the input shaft are rotatably supported by the housing, and the hole diameter of the support portion on the differential gear side is the maximum of the drive pinion. In the final reduction gear device, which has a smaller outer diameter, the supporting portion on the differential gear side is formed of a separate member from the outer housing, and the printing portion is fixed to the outer housing.
child. For this reason, assembling the input shaft to the housing (2)
The af1 can be simply performed from the differential gear side, and the assembly process can be greatly simplified. Furthermore, the gear case and gear carrier can be made into an integral structure, simplifying the structure of the housing and improving its strength, thereby achieving reductions in burden and processing man-hours. This effect can be obtained.

Furthermore, by fitting the support member into the housing as in the embodiment described above, sufficient rigidity of the support portion can be ensured, and sufficient torque can be transmitted.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part showing a drive pinion support structure of a conventional final reduction gear; FIG. 2 is a cross-sectional view of a main part showing an embodiment of the present invention; FIG. 4 is a cross-sectional view of a main part showing another embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4. A... Final reduction gear, 1... Input shaft, 2... Drive pinion, 6... Main shaft portion, 6a... Large diameter portion, 4...
... Subshaft part, 5 ... Tennibar roller bearing, 17.
...Roller bearing, 21, l! Songja, 242
．． 154...Housing, 27.67...Boss part, 2
7 a, '37 a...Bearing seat, 2a...
・Gear cane part, 29...Gear carrier part, Ro0...
・Legs, 31.41...Supporting member, 31a, 4
1 a ・= bearing part, 3 l b , 4 l b −・
・Fixing part, 31c, 41'c hole, 41d-...protrusion,
41 e 1 connection part, 41f... Opening patent applicant Nissan Motor Co., Ltd. agent Patent attorney Tetsuya Mori, patent attorney Yoshiaki Naito, patent attorney Masaru Shimizu Patent attorney Jo Kajiyama Corre-3:

Claims (1)

[Claims] A final reduction gear device in which both sides of a drive pinion provided at an end of an input shaft are rotatably supported by a housing, and a hole diameter of a supporting portion on the differential gear side is smaller than the maximum outer diameter of the drive pinion, An input shaft support structure for a final reduction gear, characterized in that the support part on the differential gear side is formed of a separate member from the nose housing, and the separate part is fixed to the nose housing.