JP2000220709A - Shaft support structure for continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the positioning of a cylinder with a retainer by pivotally providing a primary shaft of a driving pulley between a main case and a side case, and positioning a cylinder in the primary shaft, and supporting the cylinder for fixation through a retainer. SOLUTION: At the time of supporting a primary shaft 22 of a driving pulley 16 between a main case 16 and a side case freely to be turned, a driving cylinder 36 as a cylinder forming a part of a driving hydraulic chamber 34 of the driving pulley 16 is positioned and fixed to the primary shaft 22, and the primary shaft 22 is supported for fixation through a retainer 70. With this structure, at the time of pivotally supporting the primary shaft 22 of the driving pulley 16 between the main case 8 and the side case, the driving cylinder 36 forming a part of the driving hydraulic chamber 34 can be positioned and fixed to the primary shaft 22 through the retainer 70, and furthermore, the primary shaft 22 can be strongly supported for fixation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft supporting structure for a continuously variable transmission, and more particularly, to a retainer for supporting a primary shaft of a driving pulley of a continuously variable transmission, and a part of a hydraulic chamber on the driving side is provided by the retainer. The present invention relates to a shaft support structure of a continuously variable transmission capable of positioning and fixing a drive side cylinder to be formed on a primary shaft and firmly supporting and fixing the primary shaft.

[0002]

2. Description of the Related Art A vehicle such as an automobile is equipped with a transmission in order to appropriately extract a driving force generated by an internal combustion engine in accordance with an operation state. As the transmission, there are a gear transmission that takes out the gear ratio by changing the gear ratio stepwise, and a continuously variable transmission that takes out the gear ratio by changing the gear ratio steplessly with a pulley and a belt.

[0003] Some continuously variable transmissions change the gear ratio by pressure oil. This continuously variable transmission is wound around the drive pulley and the driven pulley by relatively increasing and decreasing each groove width of the drive pulley and the driven pulley by the pressure oil of the primary pressure and the line pressure, respectively. The rotational speed of the belt is relatively increased or decreased to continuously change the gear ratio.

[0004] As a shaft supporting structure of the continuously variable transmission, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 10-196749. The continuously variable transmission disclosed in this publication includes a fixed sheave rotatably supported by a case, a movable sheave that can move in the axial direction of the fixed sheave, and rotates integrally with the fixed sheave, and a movable sheave that moves in the axial direction. In a continuously variable transmission including a pair of pulleys each having a hydraulic actuator for moving the pair of pulleys, and a belt wound around the pair of pulleys, at least one of the pair of pulleys is rotatably supported by a case. Bearing, and a fixing means for positioning the bearing with respect to the fixed sheave, so that the bearing and the fixing means at least partially overlap in the axial direction, improve the axial strength of the hydraulic actuator, and The axial dimension is small.

[0005]

By the way, a first conventional example relating to a shaft supporting structure of a continuously variable transmission is disclosed. When the primary shaft 122 on the drive pulley 116 side of the continuously variable transmission 102 is pivotally supported, As shown in FIG. 6, a cylinder 136 that forms a part of a drive-side hydraulic chamber (not shown) of the drive pulley 116 is disposed at an end of the primary shaft 122, and a bearing 176 is provided on an outer portion of the cylinder 136.
Is arranged.

At this time, the bearing 176 is supported and fixed in the side case 110 of the transmission case 104.

As a result, the width dimension of the bearing, that is, the axial dimension of the primary shaft is directly reflected on the length of the continuously variable transmission. There is an inconvenience that it becomes large in size and practically disadvantageous.

According to the second conventional example, when the primary shaft 222 on the drive pulley 216 side of the continuously variable transmission 202 is pivotally supported, it is disposed at the end of the primary shaft 222 as shown in FIG. Forward / reverse switching unit 23
2, a bearing 276 is provided at an outer portion.

At this time, the bearing 276 is provided on the side case 21 of the transmission case 204 which is formed in a substantially flat shape.
It is supported and fixed within 0.

As a result, similarly to the above-described first conventional example, the width dimension of the bearing, that is, the axial dimension of the primary shaft is directly reflected on the length of the continuously variable transmission. There is an inconvenience that the overall length of the machine becomes large and the continuously variable transmission becomes large, which is disadvantageous in practical use.

Further, a third conventional example is disclosed. When the primary shaft 322 on the drive pulley 316 side of the continuously variable transmission 302 is pivotally supported, a bearing is provided on the end side of the primary shaft 322 as shown in FIG. The valve case 392 is supported by the main case 308 of the transmission case 304 via 376, and the valve body 392 is disposed at the tip of the primary shaft 322. The valve body 392 is covered by a side case 310 serving as a side cover. .

As a result, similarly to the first and second conventional examples described above, the width dimension of the bearing, that is, the axial dimension of the primary shaft is directly reflected on the length of the continuously variable transmission. The overall length of the continuously variable transmission is increased, and the size of the continuously variable transmission is increased, which is disadvantageous in practical use.

[0013]

Accordingly, in order to eliminate the above-mentioned disadvantages, the present invention provides a torque converter and a forward / reverse switching unit on a drive pulley side in a transmission case having a main case and a side case. Along with
In a continuously variable transmission in which an output clutch is disposed on a driven pulley side, a primary shaft of the driving pulley is provided so as to be pivotally supported between the main case and the side case,
A cylinder forming a part of the drive-side hydraulic chamber of the drive pulley is positioned and fixed to the primary shaft and supported and fixed via a retainer supporting the primary shaft.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION
When the primary shaft is pivotally supported between the main case and the side case, the cylinder forming a part of the drive-side hydraulic chamber of the drive pulley is positioned and fixed by a retainer, and the primary shaft is firmly supported and fixed.

[0015]

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

1 to 4 show an embodiment of the present invention. In FIG. 2, 2 is a continuously variable transmission, and 4 is a transmission case. The transmission case 4 includes a sub case 6 on the side of an internal combustion engine (not shown, right side in FIG. 2), a main case 8 connected to the sub case 6, and a side case 10 connected to the main case 8. Consists of

The sub case 6 is provided with a sub case wall portion 12 on the joining side of the main case 8. The main case 8 is provided with an intermediate partition wall section 14 that partitions the main case 8 at an intermediate portion.

The continuously variable transmission 2 includes a drive pulley 16
A driven pulley 18 and a belt 20 wound around the driven pulley 16 and the driven pulley 18, which is hydraulically controlled to change the turning radius of the belt 20 and continuously change the gear ratio. It is.

The drive pulley 16 has a primary shaft 22 serving as a drive shaft connected to the internal combustion engine, a drive-side fixed pulley piece 24 provided integrally with the primary shaft 22, and is axially movable on the primary shaft 22. And movable non-rotatable drive pulley piece 26
And

A torque converter 28 is provided in the sub case 6 at one end of the primary shaft 22 on the side of the internal combustion engine, and an oil is provided between the torque converter 28 and the fixed pulley piece 24 on the drive side from the torque converter 28 side. A pump 30 and a forward / reverse switching unit 32 are sequentially arranged. On the back side of the drive side movable pulley part 26, a drive side cylinder 36 forming a drive side hydraulic chamber 34 in cooperation with the back side of the drive side movable pulley part 26 is fixed to the primary shaft 22. A primary-shaft-side oil passage 38 formed at the other end of the primary shaft 22 communicates with the drive-side hydraulic chamber 34.

The oil pump 30 is driven by the rotation of the primary shaft 22, sucks oil in an oil pan (not shown) and feeds the oil to a hydraulic control system and a lubrication system.

The driven pulley 18 is disposed in parallel with the primary shaft 22 as a driven shaft, and is disposed corresponding to the driving-side movable pulley piece 26 and integrally with the secondary shaft 40. The driven-side fixed pulley portion 42 provided, and the driven-side movable pulley portion which is arranged corresponding to the drive-side fixed pulley portion 24 and is provided on the secondary shaft 40 so as to be axially movable and non-rotatably provided. Piece 44. One end of the secondary shaft 40 is connected to the sub case wall 12.
And the other end side is supported by the side case 10. The driven side movable pulley piece 4
On the back side of 4, a driven side cylinder 48 that forms a driven side hydraulic chamber 46 in cooperation with the back side of the driven side movable pulley piece 44 is fixed to the secondary shaft 40. The driven side hydraulic chamber 46 includes a secondary shaft 40.
The secondary shaft-side oil passage 50 formed at the end is communicated.

In the driven-side hydraulic chamber 46, the rear surface of the driven-side movable pulley portion piece 44 and the driven-side cylinder 4
A spring 52 for pressing the driven-side movable pulley portion piece 44 toward the driven-side fixed pulley portion piece 42 is provided between the portions 8. The spring 52 has a minimum belt holding force for keeping the speed ratio full low and preventing the belt 20 from slipping even when the rotation of the oil pump 30 is low and the line pressure (pump pressure) is low at the time of starting the internal combustion engine or the like. Is given.

An output clutch 54 is provided on the back side of the driven side movable pulley piece 44.
The output clutch 54 connects and disconnects the driving force from the secondary shaft 40 to a reduction drive gear 56 rotatably fitted to the secondary shaft 40.

The sub case 6 and the main case 8
, A counter shaft 58 is pivotally supported.

At one end of the counter shaft 58,
A reduction driven gear 60 that meshes with the reduction drive gear 56 is fixedly provided. The other end of the counter shaft 58 has a final drive gear 6
The final drive gear 62 is engaged with a final driven gear 68 fixed to a differential case 66 of a differential set 64. The left and right wheel shafts (not shown) are connected to the differential set 64.

At this time, when the primary shaft 22 of the drive pulley 16 of the continuously variable transmission 2 is pivotally supported between the main case 8 and the side case 10, the drive pulley 1
The drive side cylinder 36, which forms a part of the drive side hydraulic chamber 34, is positioned and fixed to the primary shaft 22, and is supported and fixed via a retainer 70 supporting the primary shaft 22.

More specifically, a first bearing 72 is provided on the case end face 8A of the main case 8, and as shown in FIG.
The drive-side fixed pulley piece 24 is provided in contact with the back surface thereof.

Further, a washer 74 and the driving cylinder 36 are sequentially incorporated at the rear portion of the driving movable pulley piece 26 of the primary shaft 22, and the retainer 70 is disposed so as to contact the driving cylinder 36. A second bearing 76 is provided around the outer periphery of the retainer 70, and the side case 10 is incorporated therein.

At this time, a positioning step portion 78 for positioning when the second bearing 76 is provided is formed on the outer peripheral portion of the retainer 70, as shown in FIGS. 3 and 4, respectively.

As shown in FIGS. 1 and 4, the positioning step 78 is formed only on the driving cylinder 36 side, and the small-diameter portion in which the second bearing 76 fits is the width of the second bearing 76. The dimension, that is, the axial dimension S of the primary shaft 22 is substantially equal to the dimension.

Further, the retainer 70 is shown in FIGS.
As shown in the figure, an inner cylindrical portion 70-1 contacting the outer periphery of the primary shaft 22, an outer cylindrical portion 70-2 contacting the inner periphery of the second bearing 76, the inner cylindrical portion 70-1 and the outer cylindrical portion 70
-2 and a plurality of meat stealing portions 80 at equal circumferential intervals to communicate
And a connection arm 70-3 formed with

Further, as shown in FIG. 4, the retainer 70 is formed such that the projection of the inner cylinder 70-1 is smaller than the projection of the outer cylinder 70-2 by the length T, and 36 has both a deformation preventing washer function and a shape for shortening the entire length of the continuously variable transmission 2.

Reference numeral 82 denotes a shim provided between the side case 10 and the second bearing 76 to adjust a processing difference between the side case 10 and other parts. Reference numeral 84 denotes a retainer for fixing the retainer 70 to the primary shaft 22. It is a nut.

Next, the operation will be described.

When supporting the primary shaft 22 in the continuously variable transmission 2, first, the primary shaft 22
A torque converter 28 is disposed in the sub case 6 at one end on the internal combustion engine side.
And an oil pump 30 and a forward / reverse switching unit 32 between the torque converter 28 side and the drive-side fixed pulley piece 24.
And are sequentially arranged.

Then, the first bearing 72 is brought into contact with the case end face 8A of the main case 8, and the back surface of the drive-side fixed pulley portion 24 of the primary shaft 22 is brought into contact with the first bearing 72.

Next, a washer 74 and the drive side cylinder 36 are sequentially assembled on the rear side of the drive side movable pulley piece 26 of the primary shaft 22, and the drive side cylinder 36
After the retainer 70 is brought into contact with the second bearing 76 and the second bearing 76 is disposed around the outer periphery of the retainer 70, the nut 84
By fixing the retainer 70 to the primary shaft 22, the side case 10 is assembled.

At this time, the positioning of the second bearing 76 is performed by the positioning step 78 formed on the outer peripheral portion of the retainer 70, and the outer cylindrical portion 70-2 of the retainer 70.
And it will be in substantially the same state.

Thus, the primary shaft 22 of the drive pulley 16 of the continuously variable transmission 2 is connected to the main case 8.
When pivotally supported between the drive case and the side case 10, the drive side cylinder 36 forming a part of the drive side hydraulic chamber 34 can be positioned and fixed to the primary shaft 22 by the retainer 70, and the primary shaft 22 is firmly supported. It can be fixed, is practically advantageous, and can prevent deformation of the drive side cylinder 36 and shorten the overall length of the continuously variable transmission 2.

The second bearing 7 is positioned by a positioning step 78 formed on the outer peripheral portion of the retainer 70.
6 can be reliably positioned, and the mountability can be improved.

Further, the inner cylindrical portion 70-1 of the retainer 70
A plurality of meat stealing portions 80 are formed at equal circumferential intervals on the connecting arm portion 70-3 between the outer arm portion 70-2 and the outer cylindrical portion 70-2. Above and economically advantageous.

Further, the inner cylindrical portion 70 of the retainer 70
-1 is longer than the protrusion of the outer cylinder 70-2 by a length T.
As shown in FIG. 1, when the primary shaft 22 is pivotally supported in the continuously variable transmission 2, the nut 84 contacts the inner cylindrical portion 70-1, thereby reducing the length T. Only the nut 84 and the second bearing 76 overlap, which makes it possible to reduce the overall length of the continuously variable transmission 2 as compared with the conventional one, and contribute to downsizing of the continuously variable transmission 2. .

It should be noted that the present invention is not limited to the above-described embodiment, and various application modifications are possible.

For example, in the embodiment of the present invention, the primary shaft 22 is provided with the retainer 70, and the retainer 70 is fixed to the primary shaft 22 by the nut 84. However, as shown in FIG. It is also possible to adopt a special configuration in which a fixing screw portion 94 is provided at the inner peripheral surface portion of the above.

In this case, when the retainer 92 is fixed to the primary shaft, the retainer 92 can be fixed by the fixing screw portion 94 formed on the inner peripheral surface of the retainer 92, so that a nut is not required and the number of parts is reduced. It is possible,
The cost can be reduced, which is economically advantageous,
Only the length in the axial direction of the retainer 92 can be used, so that the length of the primary shaft can be shortened, the total length of the continuously variable transmission can be reduced, and the size of the continuously variable transmission can be reduced. .

[0047]

As described above in detail, according to the present invention, the torque converter and the forward / reverse switching unit are arranged on the drive pulley side in the transmission case having the main case and the side case, and In a continuously variable transmission in which an output clutch is provided on the drive pulley side, a cylinder that forms a part of the drive-side hydraulic chamber of the drive pulley by providing a primary shaft of the drive pulley between the main case and the side case. Is fixed to the primary shaft and supported and fixed via a retainer that supports the primary shaft, so that when the primary shaft of the drive pulley of the continuously variable transmission is pivotally supported between the main case and the side case, The cylinder that forms part of the drive side hydraulic chamber is positioned and fixed to the primary shaft by the retainer Rukoto can, and can be firmly supported and fixed to the primary shaft, with a practically advantageous, it may play a length reductions of preventing deformation or continuously variable transmission of the drive-side cylinder.

[Brief description of the drawings]

FIG. 1 is a schematic enlarged sectional view of a portion where a retainer is provided in a continuously variable transmission according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a continuously variable transmission.

FIG. 3 is a front view of a retainer.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a schematic sectional view of a retainer showing another embodiment of the present invention.

FIG. 6 is a schematic sectional view of a continuously variable transmission showing a first prior art of the present invention.

FIG. 7 is a schematic sectional view of a continuously variable transmission showing a second prior art of the present invention.

FIG. 8 is a schematic sectional view of a continuously variable transmission showing a third prior art of the present invention.

[Explanation of symbols]

 2 Continuously Variable Transmission 4 Transmission Case 6 Subcase 8 Main Case 10 Side Case 12 Subcase Wall 14 Intermediate Partition Wall 16 Drive Pulley 18 Driven Pulley 20 Belt 22 Primary Shaft 28 Torque Converter 30 Oil Pump 32 Forward / Backward Switching Unit 34 Drive-side hydraulic chamber 36 Drive-side cylinder 38 Primary shaft 40 Secondary shaft 46 Driven-side hydraulic chamber 48 Driven-side cylinder 50 Secondary shaft-side oil passage 52 Spring 54 Output clutch 56 Reduction drive gear 58 Counter shaft 60 Reduction driven gear 62 Final drive gear 64 Differential set 66 Differential case 68 Final driven gear 70 Retainer 70-1 Inner cylinder 70-2 Outer cylinder 70-3 Contact Continuing arm portion 72 First bearing 74 Washer 76 Second bearing 78 Positioning step portion 80 Stealth portion 84 Nut

Claims (4)

[Claims] 1. A continuously variable transmission in which a torque converter and a forward / reverse switching unit are disposed on a driving pulley side in a transmission case having a main case and a side case, and an output clutch is disposed on a driven pulley side. In the transmission, a primary shaft of the drive pulley is provided so as to be pivotally supported between the main case and the side case, and a cylinder forming a part of a drive-side hydraulic chamber of the drive pulley is positioned and fixed to the primary shaft. A shaft support structure for a continuously variable transmission, wherein the shaft is supported and fixed via a retainer that supports a shaft. 2. The shaft support structure for a continuously variable transmission according to claim 1, wherein the retainer has a positioning step for positioning a bearing at an outer peripheral portion. 3. The retainer has a plurality of inner cylinders that are in contact with the outer periphery of a primary shaft, an outer cylinder that is in contact with the inner periphery of a bearing, and are arranged at equal circumferential intervals to connect the inner cylinder and the outer cylinder. The shaft support structure for a continuously variable transmission according to claim 1, further comprising: a connecting arm portion formed with a plurality of meat stealing portions. 4. The shaft support structure for a continuously variable transmission according to claim 1, wherein the retainer is provided with a fixing screw portion on an inner peripheral surface.