JP2921122B2 - Transaxle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present 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 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]

2. Description of the Related Art A transaxle has a structure in which a transmission unit and a differential unit are integrally formed. An input shaft and a counter shaft are disposed substantially in parallel with the transmission unit. Is provided with a differential shaft substantially parallel to the input shaft and the counter shaft.

[0003] The transaxle is disclosed in
There is one disclosed in Japanese Patent No. 27207. The automatic transmission-integrated final reduction gearbox of the laterally mounted engine disclosed in this publication is a differential reduction gear, a retainer, a bearing and a bearing in a state where a cover and an axle shaft are not assembled in a final reduction gear of a two-wheel drive automobile. With the bearing cap, etc. attached, the tool can be inserted into the groove to expose the interposed part of the shim plate, and the same shim plate can be removed.After removing the same shim plate, the other shim plate can be transaxle case The bearing is inserted into the axial gap between the bearing and the bearing to adjust the preload of the bearing.

[0004]

In the conventional transaxle, the case is divided on the center line of the differential shaft. That is, as shown in FIGS. 4 and 5, the first case 226 located on the engine side is used.
A second case 228 attached to the first case 226 and covering up to the transmission unit 204 and the center line C of the differential shaft 224 of the differential unit 206; and a remaining differential attached to the second case 228. Third case 229 covering unit 206
These form a transaxle case section 230.

When the transaxle 202 is assembled, the first, second, and third cases 226, 228, 229
The transmission unit 204, the differential unit 206, the drive bevel gear 220, and the driven bevel gear 222 are disposed therebetween.

As a result, there is a disadvantage that it is not possible to adjust the axial position of the differential shaft 224 after disposing the various components, and it is impossible to adjust the backlash of the drive bevel gear.

Further, at the time of adjustment, it is necessary to disassemble the differential unit, which makes the adjustment work troublesome and disadvantageous in practical use.

Further, 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 operation takes time, consumes a large amount of labor and cost, increases costs, and is disadvantageous economically.

[0009]

SUMMARY OF THE INVENTION Accordingly, 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. The transmission gear portion of the shaft and the final gear of the differential unit are provided in mesh with each other, a drive bevel gear is provided in the final gear, a driven bevel gear is provided in mesh with this drive bevel gear, and the axial position of the differential shaft is adjusted. 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 the first case has a visual hole for visually checking a contact state of the drive bevel gear. It is characterized by having been provided.

[0010]

According to the invention described above, when the transaxle is assembled, the input shaft and the counter shaft as the transmission unit, the transmission gear section, the differential shaft and the final gear as the differential unit are interposed between the first and second cases. , A drive bevel gear, and a driven bevel gear, respectively, to facilitate the axial position adjustment of the differential shaft after the arrangement, and visually check the tooth contact state of the drive bevel gear by a visual hole provided in the first case. doing.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment 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, for example, 4 is a transmission unit, and 6 is a differential unit.

The transaxle 2 is formed integrally with a transmission unit 4 and a differential unit 6. An input shaft 8 and a counter shaft 10 are disposed substantially in parallel with the transmission unit 4. The input shaft 8 and the counter shaft 10 have an input shaft-side first transmission gear unit 12 and a counter shaft-side second transmission gear unit. 14 are provided respectively. The drive gear 16 of the second transmission gear unit 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 meshed with the drive bevel gear 20, and a first case 26 located on the side of an engine, that is, an internal combustion engine (not shown), for adjusting the axial position of the differential shaft 24 of the differential unit 6 is provided. A transaxle case portion 30 is provided by the second case 28 attached to the first case 26, and a visual hole portion 32 for visually checking a contact state of the drive bevel gear 20 is provided in the first case 26.

More specifically, as shown in FIGS. 1 and 2, the transaxle case section 30 has a vertically divided structure, and the first and second transmission gear sections 12 and 14, the drive bevel gear 20, and the driven bevel gear 22, Are located in the same case.

The final gear 18 and the drive bevel gear 20 are fixedly provided on a differential case 34 of the differential unit 6 with fixing bolts 36. The differential shaft 24 in the differential case 34 is connected to a rear wheel (not shown).
First and second bearings 38 and 40 for supporting the differential case 34 are provided. 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 via the first shim 42.
And an O-ring 46 is interposed between the first retainer 44 and the first case 26, and an oil seal 48 is provided in the first retainer 44. Then, the first case 26
Then, the first retainer 44 is fixed by the first fixing bolt 50.

The second bearing 40 is disposed between the second case 28 and the differential case 34, and a second shim 52
The second retainer 54 is engaged with the second case 28 through the
An oil seal 58 is provided in the second retainer 54 via the ring 56, and the second retainer 54 is fixed to the second case 28 by the 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 of the differential shaft 24 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 at one end. A driven sprocket 68 is connected to the drive sprocket 64 via a chain 66, and the other end of the drive shaft 70 having 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, the transfer output shaft 6 of the driven bevel gear 22 at one end of the transfer output shaft 62.
The movement adjustment in the B direction, which is the second axial direction, is performed by a third shim 74 interposed between the first and third cases 26 and 72.

A hole 32 is formed in the first case 26 near the drive bevel gear 20.
Of the drive bevel gear 20 and the driven bevel gear 22 to visually check the tooth contact state.

Next, the operation will be described.

The position of the differential shaft 24 in the direction A, which is the axial direction, is adjusted by the first fixing bolt 50 and the first shim 42 from the first case 26 side, and is adjusted by the second case 28 side. From the second fixing bolt 60
And the second shim 52.

That is, if the first retainer 44 is removed by removing the first fixing bolt 50, the first shim 42 is changed to a predetermined thickness, and then the first retainer 44 is inserted and mounted with the first fixing bolt 50. Good thing.

When visually checking the tooth contact state of the drive bevel gear 20 through the hole 32, an application agent (not shown) such as silicone 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-described adjustment operation is performed to bring the drive bevel gear 20 into an appropriate tooth contact state.

Thus, after the first and second fixing bolts 50 and the first shim 42, and the second fixing bolts 60 and the second shim 52, the differential shaft 2 is disposed.
4, the position adjustment in the A direction, which is the axial direction, can be easily performed, and the backlash of the drive bevel gear 20 can be adjusted. Therefore, there is no need to disassemble the differential unit 6 at the time of adjustment, and the adjustment work is easy. This is practically advantageous.

Further, since the simultaneous machining of the first and second cases 26 and 28 and the third case 72 is not required, the machining operation can be simplified, the cost can be reduced, and it is economically advantageous. In addition, it is not necessary to measure the dimensions of each part individually, and the usability can be improved.

FIG. 3 shows a second embodiment of the present invention, and portions having the same functions as those of the above-described first embodiment will be described by assigning the same reference numerals.

The second embodiment is characterized in that first and second bearings 38 and 40 for supporting the differential case 34 are engaged with the first and second cases 26 and 28, respectively. The first and second adjuster plates 8 are pressed by the plates 80 and 82, respectively.
The first and second stoppers 84 and 86 for preventing rotation are engaged with the first and second stoppers 0 and 82, respectively.

That is, the first female screw portion 88 is engraved on the first case 26 and the first adjuster plate 80
A first external thread 90 is engraved on the outer periphery, a second internal thread 92 is engraved on the second case 28, and a second external thread 94 is engraved on the outer periphery of the second adjuster plate 82.

The first adjuster plate 80 is provided with a plurality of oblong or circular first holes 96 at equal circumferential intervals, and the second adjuster plate 82 is also provided with second holes 98 at equal circumferential intervals. Provide a plurality.

Then, one end 84 of the first stopper 84
a is fixed to the first case 26 with the first fixing bolt 100, and the other end 84 b is bent in an L-shape inward toward the differential case 34 so as to be in the first hole 96 of the first adjuster plate 80. Provided in engagement.

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

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

Then, the first case 26 is placed in the first case 26.
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 in 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 direction A, which is the axial direction of the differential shaft 24, is performed by the first and second adjuster plates 80 and 8.
It is performed according to the tightening degree of 2.

After the predetermined adjustment is completed, 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. The first ends 84a and 86a are connected to the first and second cases 26 and 28 by the first and second fixing bolts 100 and 102, respectively.
And the first and second adjuster plates 8
It stops rotation of 0, 82.

Thus, the adjustment in the direction A, which is the axial direction of the differential shaft 24, by the first and second adjuster plates 80 and 82 can be easily performed after the arrangement, and the differential unit 6 needs to be disassembled at the time of adjustment. Therefore, the adjustment work becomes easy, which is practically advantageous.

Further, similarly to the above-mentioned first embodiment, since the simultaneous machining of the first and second cases 26 and 28 and the third case 72 is not required, the machining operation can be simplified and the cost can be reduced. This is economically advantageous and eliminates the need to measure the dimensions of each part individually, thereby improving usability.

[0038]

As described above in detail, according to the present invention, the transmission gear portion of the transaxle counter shaft 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. Driven bevel gears are provided in mesh,
A transaxle case is provided by a first case located on the engine side for adjusting the axial position of the differential shaft and a second case attached to the first case, and the teeth of the drive bevel gear are provided on the first case. Since a visual hole for visually checking the contact state is provided, a transmission unit, a differential unit, a drive bevel gear, and a driven bevel gear are respectively arranged between the first and second cases when the transaxle is assembled. The visual hole provided in the first case makes it possible to easily adjust the axial position of the differential shaft after the arrangement without disassembling the differential unit while visually observing the contact state of the drive bevel gear. It is practically advantageous.
Further, since the simultaneous machining of the first and second cases is not required, the machining operation can be simplified, and the cost can be reduced.
This is economically advantageous and eliminates the need to measure the dimensions of each part individually, thereby improving usability.

[Brief description of the drawings]

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 a 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 a conventional technique 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 shaft 18 Final gear 20 Drive bevel gear 22 Driven bevel gear 24 Differential shaft 26 First case 28 Second case 30 Transaxle case part 32 Visual hole 34 Differential case 38 First bearing 40 Second bearing 42 First shim 44 First retainer 50 First fixing bolt 52 Second shim 54 Second retainer 60 Second fixing bolt 62 Transfer output shaft

Claims (1)

(57) [Claims] 1. A transaxle formed by a transmission unit having an input shaft and a counter shaft and a differential unit having a differential shaft.
The transmission gear portion of the counter shaft and the 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 this drive bevel gear, and the axial position of the differential shaft is adjusted. A transaxle case portion is provided by a first case located on the engine side and a second case attached to the first case as much as possible, and the first case has a visual hole for visually observing a tooth contact state of the drive bevel gear. A transaxle characterized by a section.