JP3184046B2 - Pulley connection structure for continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulley connecting structure of a continuously variable transmission, which can be easily assembled and can obtain a highly reliable connecting structure between a shaft and each member.

[0002]

2. Description of the Related Art FIG. 5 shows a driven pulley of a V-belt type continuously variable transmission. Reference numeral 1 in the figure denotes a driven shaft that transmits the torque transmitted from the driving pulley via the V-belt 2 to an idler shaft (not shown) via an idler gear 3. One end of the driven shaft 1 is rotatably supported by a side cover 5 constituting a casing via a bearing 4.

The driven shaft 1 has a fixed conical plate 6 that rotates integrally with the driven shaft 1 and a V
A drive pulley comprising a movable conical plate 8 which forms a U-shaped pulley groove and is movable in the axial direction of the driven shaft 1, that is, in the direction in which it comes into contact with and separates from the fixed conical plate 6 by hydraulic pressure acting on the driven pulley cylinder chamber 7. 9 are provided. The driven pulley cylinder chamber 7 is provided on the back side of the movable conical plate 8 that does not face the fixed conical plate 6, and is formed in a space defined by the cylinder member 10 and the piston member 11. Hydraulic pressure is supplied to the driven pulley cylinder chamber 7 through an oil hole 12 formed in the driven shaft 1 and an oil hole 13 formed in the movable conical plate 8.

Incidentally, one end of the driven shaft 1 on which the bearing 4 is disposed is reduced in diameter in three stages from the sliding portion 1a on which the movable conical plate 8 is externally fitted, and has a first reduced diameter. A male screw 14 is formed at one end of the portion 1b. Further, in order to caulk the first nut 15 screwed into the male screw 14, a part of the male screw 14 is cut in the axial direction to form a caulking groove 16. The external fitting connecting portion 10a of the cylinder member 10 externally fitted to the first reduced diameter portion 1b is integrally connected in a state where the external fitting connecting portion 10a is tightened toward the sliding portion 1a by the first nut 15 screwed to the male screw 13. It is supposed to be.

That is, the procedure for assembling the driven pulley 9 is as follows. First, the first member 11 a
Is connected to the movable conical plate 8 and the fixed conical plate 6
The movable conical plate 7 is connected to the driven shaft 1 so as to form a U-shaped pulley groove.
To the sliding portion 1a. Next, the external fitting connection part 10a of the cylinder member 10 is externally fitted via the spring S, and the second member 11b constituting the cylinder member 11 is externally fitted to the external fitting connection part 10a. Then, the first nut 1 is attached to the male screw 14.
By screwing 5, the movable conical plate 8 and the cylinder member 10 are connected to the driven shaft 1. Then, the bearing 4 is externally fitted to the second reduced diameter portion 1c.
7 and the drive gear 18 are externally fitted, and the third
By screwing the second nut 19 into the reduced diameter portion 1d, the bearing 4, the parking gear 17 and the drive gear 18 are connected to the driven shaft 1. By disposing the driven shaft 1 while the outer race 4a of the bearing 4 is in contact with the inner wall of the side cover 5, the assembly of the driven pulley 9 is completed.

[0006]

However, the connection structure of the driven pulley shown in FIG. 5 has the following problems. First, since the male screw 14 having the caulking groove 16 is formed at one end of the driven shaft 1, a finishing process such as screw polishing and carbon prevention treatment is required, and the processing cost of the driven shaft 1 is greatly increased. Resulting in.

Secondly, when the first nut 12 is tightened, it is necessary to control the tightening torque to prevent the nut from being loosened and to control the caulking, so that the number of control steps during assembly is very large. Third, in addition to the problem of the processing cost of the driven shaft 1 described above, a great deal of labor and time are required for assembling, so that there is a problem in terms of cost reduction.

Fourth, the outer fitting connecting portion 1 of the cylinder member 10
0a and a crimping force for the first nut 15 require a predetermined number of male threads 14 and a length of the crimping groove 16 of a predetermined dimension.
Length H ₁ is set longer. Therefore, the side cover 5 protrudes outward, and the dimension of the continuously variable transmission in the axial direction increases, which makes it difficult to mount the continuously variable transmission on a small vehicle.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a pulley connecting structure of a continuously variable transmission that can reduce the cost by simple assembly while improving reliability.

[0010]

According to the present invention , there is provided a continuously variable transmission comprising:
The shaft has a shaft whose both ends are rotatably supported on the inner wall of the casing via bearings, a fixed conical plate integrally fixed to one end of the shaft, and an axis which is connected to the other end of the shaft. A movable conical plate which is fitted outside so as to be movable in the direction, and which is disposed opposite to the fixed conical plate to form a V-shaped groove;
A pulley coupling structure for a continuously variable transmission, comprising: a fluid pressure cylinder chamber disposed on the back side of the movable conical plate that is not opposed to the fixed conical plate and configured to move the movable conical plate in an axial direction by fluid pressure supply control. , ring groove is formed in the other end of the shaft, to the ring groove, and the cylinder member and the abutting ring member fitted over the fluid pressure cylinder chamber is fitted to the shaft, the ring member, the ring Fit into groove
In the circumferential direction to press the cylinder member toward the fixed conical plate
A C-shaped ring composed of a plurality of divided members;
A C-shaped ring is provided integrally around the outer circumference of the C-shaped ring.
With a ring-shaped retainer that restrains radial movement of the
While being configured, a bearing fitted by press-fitting from the other end of the shaft abuts the retainer and
A structure for regulating the axial position of the C-shaped ring and the retainer .

[0011]

[0012]

According to the pulley connecting structure of the continuously variable transmission according to the first aspect of the present invention, since only the ring groove is formed at the other end of the shaft to which the cylinder member is connected, the processing cost is greatly reduced. You. Further, the cylinder member externally fitted on the shaft comes into contact with the ring member by fitting the ring member into the ring groove, and the bearing fitted externally on the other end side of the shaft by press fitting comes into contact with the ring member. Since the ring member is integrally connected to the shaft only by contacting and regulating the axial position of the ring member, the ring member can be assembled very easily by a simple assembly procedure.

Further, since a male screw or a caulking groove as in the conventional structure is not formed, and only a ring groove is formed on the shaft,
The length of the shaft in the axial direction can be set short, and a continuously variable transmission with a reduced axial dimension can be provided. Further, since the C-shaped ring whose radial movement is restricted by the retainer is constituted by a plurality of divided members divided in the circumferential direction, the C-shaped ring can be easily fitted into the ring groove, and the assembly is further facilitated. It can be.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. The same components as those in the structure shown in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a skeleton diagram showing a power transmission mechanism of a V-belt type continuously variable transmission according to the present invention.

Reference numeral 20 in the figure denotes an engine as a rotary drive source, and a fluid coupling 22 as a fluid transmission is connected to an output shaft 20a. The fluid coupling 22 has a lock-up mechanism, and mechanically connects the input-side pump impeller 22b and the output-side turbine runner 22c by controlling the hydraulic pressure of the lock-up oil chamber 22a. It can be separated.

The output side of the fluid coupling 22 is connected to a rotating shaft 23. The rotating shaft 23 is connected to a forward / reverse switching mechanism 25. The forward / reverse switching mechanism 25 includes a planetary gear mechanism 27, a forward clutch 40, and a reverse brake 45. The planetary gear mechanism 27 includes a sun gear 2
9, a pinion carrier 35 having two pinion gears 31 and 33, and an internal gear 37. The two pinion gears 31 and 33 are in mesh with each other, the pinion gear 31 is in mesh with the sun gear 29, and the pinion gear 33 is in the internal gear 37.
Is engaged. The sun gear 29 is connected so as to always rotate integrally with the rotating shaft 23. Pinion carrier 3
5 can be connected to the rotating shaft 23 by a forward clutch 40. The internal gear 37 can be fixed to a stationary part by a reverse brake 45. The pinion carrier 35 includes a drive shaft 2 disposed on the outer circumference of the rotation shaft 23.
The drive shaft 24 is provided with a drive pulley 50.

The drive pulley 50 has a fixed conical plate 52 that rotates integrally with the drive shaft 24, a V-shaped pulley groove disposed opposite to the fixed conical plate 52, and a hydraulic pressure acting on the drive pulley cylinder chamber 54. And a movable conical plate 56 which is movable in the axial direction of the drive shaft 24. The driving pulley 50 is driven by the driven pulley 9 by the V-belt 2.
And are operably connected.

The driven pulley 9 is provided on the driven shaft 1 rotatably supported by the side cover at one end via the bearing 4 and at the other end via the bearing 60, and is integrated with the driven shaft 1. And a V-shaped pulley groove formed opposite to the fixed conical plate 6 to rotate in the axial direction of the driven shaft 1 by hydraulic pressure acting on the driven pulley cylinder chamber 7. And a movable conical plate 8. Then, the aforementioned drive pulley 5
The V belt 2 and the driven pulley 9 constitute a V belt type continuously variable transmission mechanism 70.

A drive gear 1 integrated with the driven shaft 1
8 meshes with the idler gear 3 on the idler shaft 74. The pinion gear 76 provided on the idler shaft 74 always meshes with the final gear 78. A pair of pinion gears 82 and 84 constituting the operating device 80 are attached to the final gear 78.
2 and 84 are engaged with a pair of side gears 86 and 88. The side gears 86 and 88 are connected to output shafts 90 and 9 respectively.
It is connected to 2.

The engine 20 is connected to the power transmission mechanism as described above.
The rotational force input from the output shaft 20a of the motor 2 is transmitted to the forward / reverse switching mechanism 2
5, when the forward clutch 40 is engaged and the reverse brake 45 is released, the rotational force of the rotating shaft 23 is the same through the planetary gear mechanism 27 which is in an integrally rotating state. The rotation is transmitted to the drive shaft 24 in the same direction, while the forward clutch 40 is released and the reverse brake 45 is engaged, the rotational force of the rotary shaft 23 is reduced by the action of the planetary gear mechanism 27 in the rotational direction. Are transmitted to the drive shaft 24 in the reverse state. The rotational force of the drive shaft 24 includes a drive pulley 50, a V-belt 2, a driven pulley 9,
The power is transmitted to the differential device 80 via the driven shaft 1, the drive gear 18, the idler gear 3, the idler shaft 74, the pinion gear 76, and the final gear 78, and the output shafts 90 and 92 rotate in the forward or backward direction. The forward clutch 4
When both 0 and the reverse brake 45 are released, the power transmission mechanism is in a neutral state.

In transmitting the power as described above, the movable cone plate 56 of the driving pulley 50 and the movable cone plate 8 of the driven pulley 9
Is moved in the axial direction to change the radius of the contact position with the V-belt 2, whereby the rotation ratio between the driving pulley 50 and the driven pulley 9 can be changed. For example, if the width of the V-shaped pulley groove of the drive pulley 50 is increased and the width of the V-shaped pulley groove of the driven pulley 9 is reduced, the V-belt 2 on the drive pulley 50 side has a smaller contact position radius, Driven pulley 9
The radius of the contact position of the V-belt 2 on the side becomes large, so that a large gear ratio is eventually obtained. Movable conical plates 56 and 8
Is moved in the opposite direction, the gear ratio becomes smaller, contrary to the above.

Next, a specific structure of the driven pulley 9 of the present embodiment will be described with reference to FIGS. The position of the driven shaft 1 at which the outer fitting connecting portion 10a of the cylinder member 10 is fitted is the first reduced diameter portion (reduced diameter) of the reduced diameter portion reduced in three stages from the sliding portion 1a as in FIG. (Radial shaft portion) 1b.

In this embodiment, a ring groove 100 is formed on the outer periphery of the first reduced diameter portion 1b, and a ring member is fitted into the ring groove 100, and the bearing 4 is fitted onto the driven shaft 1 by press fitting. Is brought into contact with the ring member, so that the cylinder member 10 is connected while maintaining liquid tightness. That is, the ring groove 100 is
The outer fitting connecting portion 10a is formed closer to the end 1e than the outer fitting position. The ring groove 100 has a C-shaped ring 102 having a thickness substantially equal to the width of the ring groove 100.
Of the inner ring is fitted. This C-shaped ring 102
As shown in FIG. 3, is constituted by divided members 102a and 102b divided into two in the circumferential direction, and the inner diameter d ₁ of the inner ring portion defined by those members is equal to the diameter of the groove bottom of the ring groove 100. The dimensions are set to be substantially the same. When the C-shaped ring 102 is fitted into the ring groove 100, the outer fitting connecting portion 10a of the cylinder member 10 is pressed toward the sliding portion 1a.

Then, C inserted into the ring groove 100
A ring-shaped retainer 10 is provided on the outer ring side of the shaped ring 102.
4 are provided integrally. As shown in FIG. 4, the retainer 104 has an inner diameter d ₂ substantially the same as the outer diameter of the first reduced diameter portion 1b, and an outer diameter d ₃ substantially the same as the outer diameter of the C-shaped ring 102. Ring portion 104a, and ring-shaped standing edge portion 1 rising from the outer peripheral edge of the ring portion 104a
04b. Then, by being externally fitted to the first reduced diameter portion 1b, the ring portion 104a comes into contact with the side surface of the C-shaped ring 102, and the inner wall of the upright edge portion 104b comes into contact with the outer peripheral surface of the C-shaped ring 102 so that the C-shaped The radial movement of the divided members 102a and 102b constituting the ring 102 is restricted.

The inner diameter of the inner race 4b is equal to that of the second reduced diameter portion 1c.
Of the second diameter-reducing portion 1c.
The inner race 4b has a side surface in contact with the side surface of the retainer 104. This restricts the movement of the retainer 104 in the axial direction. Next, a procedure for assembling the driven pulley according to the present embodiment will be described.

First, after the first member 11a is connected to the movable conical plate 8, the movable conical plate 7 is externally connected to the sliding portion 1a of the driven shaft 1 so as to form a V-shaped pulley groove with the fixed conical plate 6. Fit. Next, the outer fitting connection portion 10a of the cylinder member 10 is externally fitted via the spring S, and the second member 11b is externally fitted to the outer fitting connection portion 10a. Next, the dividing member 102a,
102b are sequentially fitted into the ring groove 100. Next, the retainer 104 is externally fitted toward the C-shaped ring 102, the ring portion 104a is brought into contact with the side surface of the C-shaped ring 102, and the inner wall of the upright edge portion 104b is brought into contact with the outer peripheral surface of the C-shaped ring 102. To be integrated with the C-shaped ring 102. Then, the bearing 4 is externally fitted to the second reduced diameter portion 1c by press fitting, and the side surface of the inner race 4b is brought into contact with the side surface of the retainer 104. Then, the parking gear 17 and the driving gear 18 are further fitted to the second reduced diameter portion 1c,
The parking gear 17 and the driving gear 18 are connected to the driven shaft 1 by screwing the second nut 19 into the third reduced diameter portion 1d in which the male screw is formed. Then, by disposing the driven shaft 1 such that the outer race 4a of the bearing 4 comes into contact with the inner wall of the side cover 5, the assembly of the driven pulley 9 is completed.

Therefore, according to the connection structure of the driven pulley of the present embodiment, the driven shaft 1 is connected like the conventional structure shown in FIG.
Since the male screw 14 and the caulking groove 16 are not formed in the first reduced diameter portion 1b, only the ring groove 100 is formed on the outer periphery thereof,
The processing cost of the driven shaft 1 can be greatly reduced. Further, after the C-shaped ring 102 is fitted into the ring groove 100 and the retainer 104 is
Since the side surface of the bearing 4 which is externally fitted to the reduced diameter portion 1c by press fitting is connected to the driven shaft 1 simply by abutting against the side surface of the retainer 104, it is extremely easy to perform by a simple assembly procedure as compared with the conventional structure. It can be assembled.

Since the C-shaped ring 102 whose movement in the radial direction is restricted by the retainer 104 is constituted by the divided members 102a and 102b divided into two in the circumferential direction, it is easily fitted into the ring groove 100. And assembly is easier. Also, by fitting the C-shaped ring 102 into the ring groove 100,
Since the fitting connection portion 10a of the cylinder member 10 is pressed toward the sliding portion 1a, the driven pulley cylinder chamber 7 can have a highly reliable liquid-tight structure. Thus, when a predetermined oil pressure is supplied to the driven pulley cylinder chamber 7, the width of the V-shaped pulley groove is enlarged or reduced with high accuracy, and the driven shaft 1
Can be reliably transmitted to the operating device 80 through the idler gear 3.

Further, in this embodiment, since no male screw or caulking groove is formed in the first reduced diameter portion 1b, the connection fitting portion 10a
And so it becomes possible to set shorter axial length H ₂ of between the bearing 4, thereby, the axial been attempted to shorten the dimension mounting capable CVT to small cars Can be provided. The C-ring 10 of the present embodiment
2 are divided members 102a, 102b as shown in FIG.
However, the gist of the present invention is not limited to this.

[0030]

As described above, according to the first aspect of the present invention,
In the pulley connection structure of the continuously variable transmission described above, since only the ring groove is formed on the shaft to which the cylinder member is connected, the processing cost can be significantly reduced. Further, the cylinder member externally fitted on the shaft comes into contact with the ring member by fitting the ring member into the ring groove, and the bearing fitted externally on the other end side of the shaft by press fitting comes into contact with the ring member. Since it is integrally connected to the shaft only by contacting and regulating the axial position of the ring member, the assembling operation can be completed very easily by a simple assembling procedure. Therefore, the present invention can reduce the cost of the continuously variable transmission.

Further, since a male screw or a caulking groove as in the conventional structure is not formed and only a ring groove is formed on the shaft,
The length of the shaft in the axial direction can be set shorter, thereby providing a continuously variable transmission that can be reduced in axial size and can be mounted on a small vehicle. Further
The C-shaped ring, whose movement in the radial direction is restricted by the retainer, is composed of a plurality of divided members divided in the circumferential direction, so that the C-shaped ring can be easily fitted into the ring groove and further facilitates assembly. It can be.

[Brief description of the drawings]

FIG. 1 is a diagram showing a power transmission mechanism of a continuously variable transmission according to the present invention.

FIG. 2 is a sectional view of a main part showing a driven pulley connection structure according to the present invention.

FIG. 3 is a front view showing a C-shaped ring according to the present invention.

FIG. 4 is a front view showing a retainer according to the present invention.

FIG. 5 is a sectional view of a main part showing a conventional driven pulley connection structure.

[Explanation of symbols]

 Reference Signs List 1 driven shaft (shaft) 1b first reduced diameter portion (shaft) 1c second reduced diameter portion (shaft) 1e other end of driven shaft 2 V belt 4 bearing 5 side cover (casing) 6 fixed conical plate 7 driven pulley cylinder chamber (Hydraulic cylinder chamber) 8 Movable conical plate 10 Cylinder member 10a Cylinder member external fitting connection portion 100 Ring groove 102 C-shaped ring (ring member) 102a, 102b C-shaped split member 104 Retainer (ring member)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kiyofumi Tanaka 2 Nissan Motor Co., Ltd., Takara-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture 73349 (JP, U) JP-A 3-48148 (JP, U) Jiko 36-14808 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16H 9/00-9 / 26 F16B 21/00-21/20

Claims (1)

(57) [Claims] 1. A shaft whose both ends are rotatably supported on the inner wall of a casing via bearings, a fixed conical plate integrally fixed to one end of the shaft, and an axial direction on the other end of the shaft. A movable conical plate that is externally fitted so as to be movable to the movable conical plate and that is arranged to face the fixed conical plate to form a V-shaped groove; and a movable conical plate is disposed on the back side not facing the fixed conical plate. And a fluid pressure cylinder chamber for moving the movable conical plate in the axial direction by fluid pressure supply control, wherein a ring groove is formed on the other end side of the shaft. A ring member that is in contact with the cylinder member of the fluid pressure cylinder chamber that is externally fitted to the shaft is fitted into the shaft portion.
The material fixes the cylinder member by fitting it into the ring groove.
From a plurality of circumferentially divided members that press toward the plate side
C-shaped ring and the circumference of this C-shaped ring
Ring that restricts the radial movement of the C-shaped ring
Together is constituted by a grayed-shaped retainer, fitted on the bearing by press fitting from the other end of the <br/> shaft, wherein
A pulley coupling structure for a continuously variable transmission, wherein the axial position of the C-shaped ring and the retainer is regulated by contacting the retainer .