JPH04249656A - Trans axle - Google Patents

Abstract

PURPOSE:To observe the meshed state of a bevel gear by arranging a speed change gear part, differential gear shaft, final gear, bevel gear, etc., between two case parts, facilitating the axial direction position adjustment after arrangement, and forming an observing hole part on one case. CONSTITUTION:A trans axle 2 is formed integrally with a transmission unit 4 and a differential gear unit 6. In the transmission unit 4, an input shaft 8 and a countershaft 10 are arranged nearly in parallel, and the first and second speed change gear parts 12 and 14 are arranged on the shafts 8 and 10. The drive gear 16 of the second speed change gear part 14 and the final gear 18 of the differential gear unit 6 are meshed, and a driven bevel gear 22 is meshed with a drive bevel gear 20 installed on the final gear 18. A trans axle case part 30 is constituted from the first and second cases 26 and 28, in order to freely adjust the axial direction position of the differential gear shaft 24 of the differential gear unit 6, and an observing hole part 32 for observing the meshed state of the drive bevel gear 20 is formed on the first case 26.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to a transaxle, and more particularly to a transmission unit having an input shaft and a counter shaft disposed substantially parallel to each other, and a transmission unit disposed substantially parallel to the input shaft and the counter shaft. The present invention relates to a transaxle formed by a differential unit having a differential shaft.

0002

[Prior Art] A transaxle has a structure in which a transmission unit and a differential unit are integrally formed.The transmission unit has an input shaft and a counter shaft disposed substantially parallel to each other, and the differential unit A differential shaft is disposed substantially parallel to the input shaft and the counter shaft.

[0003] The transaxle is disclosed in Japanese Patent Application Laid-open No. 1983-
There is one disclosed in Japanese Patent No. 27207. The automatic transmission-integrated final reduction device with an engine horizontally mounted type disclosed in this publication is a final reduction device for a two-wheel drive vehicle in which the differential gear, retainer, bearing, and With the bearing cap etc. still attached, the shim plate can be removed by inserting a tool into the groove and facing the interposed part of the shim plate, and after removing the shim plate, attach the other shim plate to the transaxle case. It is inserted into the axial gap between the bearing and the bearing to adjust the bearing preload.

0004

In the conventional transaxle, the case portion is divided on the center line of the differential shaft. In other words, as shown in FIGS. 4 and 5, the first case 226 located on the engine side
A second case 228 is attached to the first case 226 and covers the transmission unit 204 portion and the center line C of the differential shaft 224 of the differential unit 206, and a second case 228 is attached to the second case 228 and covers the remaining differential shaft. Third case 229 covering unit 206 part
The transaxle case portion 230 is constituted by the above.

[0005] When the transaxle 202 is assembled, the first, second and third cases 226, 228, 229 are
A transmission unit 204, a differential unit 206, a drive bevel gear 220, and a driven bevel gear 222 are arranged between them.

As a result, there are disadvantages in that the axial position of the differential shaft 224 cannot be adjusted after various parts have been arranged, and it is also impossible to adjust the backlash of the drive bevel gear.

[0007] Furthermore, during adjustment, it is necessary to disassemble the differential unit, which makes the adjustment work troublesome and is disadvantageous in practice.

Furthermore, by dividing the second and third cases on the center line of the differential shaft,
Simultaneous machining of the second and third cases is required, and the machining work is time-consuming and consumes a large amount of labor and cost, which is disadvantageous in that the cost becomes large and is economically disadvantageous.

[0009]

[Means for Solving the Problems] Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides a transaxle formed by a transmission unit having an input shaft and a counter shaft, and a differential unit having a differential shaft. A speed change gear portion of the shaft and a final gear of the differential unit are provided in mesh with each other, a drive bevel gear is provided in the final gear, and a driven bevel gear is provided in mesh with the drive bevel gear to adjust the axial position of the differential shaft. A transaxle case portion is provided by a first case located on the engine side and a second case attached to the first case, and a viewing hole portion is provided in the first case to visually check the tooth contact condition of the drive bevel gear. It is characterized by having been established.

0010

[Operation] With the invention as described above, when assembling the transaxle, the input shaft and counter shaft of the transmission unit, the transmission gear part, the differential shaft and final gear of the differential unit are connected between the first and second cases. , a drive bevel gear, and a driven bevel gear are arranged respectively to facilitate the axial position adjustment of the differential shaft after arrangement, and to visually check the tooth contact condition of the drive bevel gear through a viewing hole provided in the first case. are doing.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention. In FIG. 2, 2 is a transaxle for four-wheel drive, 4 is a transmission unit, and 6 is a differential unit.

The transaxle 2 is integrally formed with a transmission unit 4 and a differential unit 6. In the transmission unit 4, an input shaft 8 and a counter shaft 10 are arranged substantially parallel to each other, and the input shaft 8 and the counter shaft 10 are provided with a first speed change gear section 12 on the input shaft side and a second speed change gear section on the counter shaft side. 14 are provided respectively. The drive gear 16 of the second transmission gear section 14 and the final gear 18 of the differential unit 6 are provided in mesh with each other, and the final gear 18 is provided with a drive bevel gear 20. A driven bevel gear 22 is provided in mesh with this drive bevel gear 20, and is connected to a first case 26 located on the side of the engine, that is, an internal combustion engine (not shown), in order to adjust the axial position of the differential shaft 24 of the differential unit 6. A transaxle case portion 30 is provided with a second case 28 attached to the first case 26, and a viewing hole 32 is provided in the first case 26 to visually check the tooth contact state of the drive bevel gear 20.

More specifically, as shown in FIGS. 1 and 2, the transaxle case portion 30 has a vertically divided structure, and the first and second transmission gear portions 12 and 14, the drive bevel gear 20, and the driven bevel gear 22 are connected to each other. are located in the same case.

Further, the final gear 18 and the drive bevel gear 20 are fixed to the differential case 34 of the differential unit 6 with fixing bolts 36. The differential shaft 24 inside the differential case 34 is connected to a rear wheel (not shown). First and second bearings 38 and 40 are provided to support the differential case 34. That is, the first bearing 38 is disposed between the first case 26 and the differential case 34, and the first retainer 44 is connected to the first case 26 through the first shim 42.
At the same time, an O-ring 46 is interposed between the first retainer 44 and the first case 26, and an oil seal 48 is disposed within the first retainer 44. And the first case 26
The first retainer 44 is fixed with a first fixing bolt 50.

The second bearing 40 is disposed between the second case 28 and the differential case 34, and the second shim 52
The second retainer 54 is engaged with the second case 28 via the
An oil seal 58 is disposed within the second retainer 54 via the ring 56, and the second retainer 54 is fixed to the second case 28 with a second fixing bolt 60.

At this time, the first and second shims 42, 52
The drive bevel gear 20 connected to the differential case 34 is slid in the A direction, which is the axial direction of the differential shaft 24, by adjusting the thickness and tightening the first and second fixing bolts 50 and 60.

A drive sprocket 64 is provided at the other end of the transfer output shaft 62 to which the driven bevel gear 22 is fixed. A driven sprocket 68 is connected to the drive sprocket 64 via a chain 66, and the other end of a drive shaft 70 with the driven sprocket 68 fixed to one end is connected to a front wheel (not shown). The drive shaft 70 is covered by the second case 28.

The transfer output shaft 62 includes a first case 26 and a third case 7 attached to the first case 26.
2, and the transfer output shaft 6 in the driven bevel gear 22 at one end of the transfer output shaft 62.
Movement adjustment in the B direction, which is the axial direction of the second case, is performed by a third shim 74 interposed between the first and third cases 26 and 72.

Further, a hole 32 is formed in the first case 26 near the drive bevel gear 20, and the hole 32
This function is used to visually check the state of tooth contact between the drive bevel gear 20 and the driven bevel gear 22.

Next, the operation will be explained.

When adjusting the position of the differential shaft 24 in the axial direction A, it is done from the first case 26 side using the first fixing bolt 50 and the first shim 42, and from the second case 28 side. from the second fixing bolt 60
and the second shim 52.

That is, if the first fixing bolt 50 is removed, the first retainer 44 is taken out, and the first shim 42 is changed to a predetermined thickness, the first retainer 44 is inserted and attached using the first fixing bolt 50. It's good.

In addition, when visually checking the tooth contact condition of the drive bevel gear 20 through the hole 32, a lubricant (not shown) such as Shikotan is applied to the meshing surface of the drive bevel gear 20 in advance. The tooth contact state is confirmed based on the peeling state of the coating agent, and the above-mentioned adjustment operation is performed to bring the drive bevel gear 20 into an appropriate tooth contact state.

As a result, the differential shaft 2 is fixed after being installed by the first and second first fixing bolts 50 and first shims 42, as well as the second fixing bolts 60 and second shims 52.
4 can be easily adjusted in the A direction, which is the axial direction, and the backlash of the drive bevel gear 20 can be adjusted, and there is no need to disassemble the differential unit 6 during adjustment, making the adjustment work easier. Therefore, it is practically advantageous.

Furthermore, since simultaneous machining of the first and second cases 26, 28 and third case 72 is not necessary, the machining work can be simplified and costs can be reduced, which is economically advantageous. , it is no longer necessary to measure the dimensions of each component individually, and usability can be improved.

FIG. 3 shows a second embodiment of the present invention, and parts having the same functions as those in the first embodiment described above will be described with the same reference numerals.

This second embodiment is characterized by first and second adjusters that engage the first and second bearings 38 and 40 that support the differential case 34 with the first and second cases 26 and 28. These first and second adjuster plates 8 are pressed by the plates 80 and 82, respectively.
0 and 82 are provided with first and second rotation prevention stoppers 84 and 86 engaged with each other.

That is, the first female screw portion 88 is carved in the first case 26, and the first adjuster plate 80 is
A first male threaded portion 90 is carved on the outer periphery, a second female threaded portion 92 is carved on the second case 28, and a second male threaded portion 94 is carved on the outer periphery of the second adjuster plate 82.

In addition, the first adjuster plate 80 is provided with a plurality of oval or circular first holes 96 at equal intervals around the circumference, and the second adjuster plate 82 is also provided with second holes 98 at equal intervals around the circumference. Provide multiple pieces.

One end 84 of the first stopper 84
A is fixed to the first case 26 with a first fixing bolt 100, and the other end 84b is bent inward toward the differential case 34 into an L shape and inserted into the first hole 96 of the first adjuster plate 80. Provided in an engaged manner.

Furthermore, one end 86a of the second stopper 86
is fixed to the second case 28 with a second fixing bolt 102, and the other end 86b is bent inward toward the differential case 34 in an L shape to engage the second hole 98 of the second adjuster plate 82. It is provided in conjunction with the above.

A differential side case 104 is provided outside the first adjuster plate 80, and a first oil seal 106 is interposed within the differential side case 104.
A retainer 108 is interposed between the bearing 40 and the second adjuster plate 82, and a second oil seal 110 is provided within the retainer 108.

[0034] Then, in the first case 26, the first
The adjuster plate 80 and the first bearing 38 are sequentially arranged from the outside, and the second adjuster plate 82, the retainer 108, and the second bearing 40 are sequentially arranged inside the second case 28. The differential case 34 is supported by the first and second bearings 38 and 40, and the adjustment of the differential case 34 in the A direction, which is the axial direction of the differential shaft 24, is performed by the first and second adjuster plates 80 and 80.
This is done according to the degree of tightening shown in step 2.

After completing the predetermined adjustment, the other ends 84b and 86b of the first and second stoppers 84 and 86 are engaged with the first and second holes 96 and 98 of the first and second adjuster plates 80 and 82, respectively. While aligning the ends 84a and 86a with the first and second fixing bolts 100 and 102 to the first and second cases 26 and 28,
the first and second adjuster plates 80.
, 82 are prevented from rotating.

[0036] With this, adjustment in the A direction, which is the axial direction of the differential shaft 24, can be easily performed by the first and second adjuster plates 80 and 82 after installation, and there is no need to disassemble the differential unit 6 during adjustment. This makes adjustment work easier, which is advantageous in practice.

Furthermore, as in the first embodiment, since simultaneous machining of the first and second cases 26, 28 and third case 72 is not required, machining operations can be simplified and costs can be reduced. This is not only economically advantageous, but also eliminates the need to measure the dimensions of each component individually, improving usability.

[0038]

As described in detail above, according to the present invention, the transmission gear portion of the counter shaft of the transaxle and the final gear of the differential unit are provided in mesh with each other, the final gear is provided with a drive bevel gear, and the drive bevel gear is provided with a drive bevel gear. Driven bevel gears are meshed and provided.
In order to adjust the axial position of the differential shaft, a transaxle case part is provided by a first case located on the engine side and a second case attached to the first case, and the teeth of the drive bevel gear are provided in the first case. A visual inspection hole is provided to visually check the contact status, so when assembling the transaxle, the transmission unit, differential unit, drive bevel gear, and driven bevel gear can be installed between the first and second cases, and after installation. The axial position of the differential shaft after installation can be easily adjusted without disassembling the differential unit while visually checking the tooth contact condition of the drive bevel gear through the visual inspection hole provided in the first case. , which is advantageous in practice. In addition, since simultaneous machining of the first and second cases is not required, machining work can be simplified and costs can be reduced.
In addition to being economically advantageous, it eliminates the need to measure the dimensions of each component individually, improving usability.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a main part of a differential unit portion of a transaxle showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the transaxle.

FIG. 3 is an enlarged sectional view of a main part of a differential unit portion of a transaxle showing a second embodiment of the present invention.

FIG. 4 is a partially cutaway sectional view of a transaxle showing the prior art of the present invention.

FIG. 5 is a right side view of the transaxle.

[Explanation of symbols]

2 Transaxle 4 Transmission unit 6 Differential unit 8 Input shaft 10 Counter axis 18 Final gear 20 Drive bevel gear 22 Driven bevel gear 24 Differential shaft 26 1st case 28 Second case 30 Transaxle case part 32 Visual inspection hole 34 Differential case 38 First bearing 40 Second bearing 42 1st shim 44 First retainer 50 First fixing bolt 52 2nd shim 54 Second retainer 60 Second fixing bolt 62 Transfer output shaft

Claims (1)

[Claims] 1. In a transaxle formed by a transmission unit having an input shaft and a counter shaft and a differential unit having a differential shaft, a transmission gear portion of the counter shaft and a final gear of the differential unit are provided in mesh with each other, A drive bevel gear is provided in the final gear, and a driven bevel gear is provided in mesh with the drive bevel gear, and the drive bevel gear is attached to a first case located on the engine side to adjust the axial position of the differential shaft. A transaxle, characterized in that a transaxle case portion is provided with a second case, and a viewing hole portion is provided in the first case to visually check the tooth contact state of the drive bevel gear.