JPH0784902B2 - Movable pulley - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a movable pulley mounting shaft, in particular, a disc-shaped portion and a cylindrical portion integrally formed at the rear portion of the disc-shaped portion, which rotates on the outer periphery of the mounting shaft. Impossible and axially moveable pulley body, and the outer circumference of the flange portion is fitted to the inner circumference of the cylindrical portion so that the pulley body can slide along the axial direction. And a fixed piston member that is fitted and mounted on the outer periphery of the mounting shaft in a state of being immovable in the axial direction, and that forms a first pressure chamber in the cylindrical portion by the flange portion and the disc-shaped portion, Between the closing plate fitted and fixed to the inner circumference of the cylindrical portion so as to form the second pressure chamber in the cylindrical portion with the flange portion, and between the disc-shaped portion and the flange portion in the first pressure chamber. Movable pulley configured to include a coiled spring interposed It relates to a mounting shaft for mounting.

(Background of the Technology) Belt type continuously variable transmission, particularly, for example, JP-A-52-9886.
As disclosed in Japanese Unexamined Patent Publication No. 1 etc., each movable pulley of the drive shaft pulley provided on the drive shaft and the driven shaft pulley provided on the driven shaft is axially moved on the drive shaft or the driven shaft by the pressure of the pressure fluid. Along the movable shaft of the drive shaft pulley or the driven shaft pulley of the belt type continuously variable transmission of the type in which the pulley groove width is changed by sliding along the shaft to change the speed ratio between the drive shaft and the driven shaft. As shown in FIG. 6, a disc-shaped portion a and a cylindrical portion b integrally formed on the rear portion of the disc-shaped portion a.
And a pulley body d fitted and mounted on the outer periphery of the mounting shaft c in a non-rotatable and axially movable manner, and an outer periphery of the flange portion e on the inner periphery of the cylindrical portion b. The main body d is fitted so as to be slidable along the axial direction, and is fitted and mounted on the outer periphery of the mounting shaft c so as to be immovable in the axial direction, and the flange portion e and the disc shape are attached. The fixed piston member g that forms the first pressure chamber f in the cylindrical portion b with the portion a and the cylindrical portion b with the flange portion e.
Between the closing plate i fitted and fixed to the inner periphery of the cylindrical portion b so as to form the second pressure chamber h therein, and between the disc-shaped portion a and the flange portion e in the first pressure chamber f. There is a configuration including a coiled spring j interposed. In the movable pulley k having such a structure, a part of the pressure fluid (pressure oil) in the first pressure chamber f is made to flow into the second pressure chamber h through the orifice l provided in the flange portion e. ,
The pressure of the pressure fluid (the centrifugal hydraulic pressure generated by the rotation of the mounting shaft c) opposes the load in the first pressure chamber f applied to the flange portion e, and the coiled spring j
At this time, when the engine is stopped, an appropriate tension is applied to the endless belt m, and the pulley body d is set to the initial position, that is, the low speed side (the state shown in the drawing). Therefore, the second pressure chamber h is formed. It has the closing plate i and the spring j interposed in the first pressure chamber f. Then, such a movable pulley k is generally attached to the attachment shaft c after the spring j, the fixed piston g, and the closing plate i are attached to the pulley body d in this order.

(Prior art and problems) However, in mounting the movable pulley k described above, in the conventional structure, the flange portion e of the fixed piston member g is freely movable in the cylindrical portion b along the axial direction. Therefore, there is a problem that it is difficult to assemble the closing plate i. That is, the fixed piston member g incorporated in the pulley main body d is in a state of being returned by the elastic force of the spring j that is about to return to the free state. Therefore, in order to set the closing plate i at a predetermined position, the fixed piston member g must be pushed against the spring j until its flange portion e is placed at a position that does not affect the setting of the closing plate i. Since the spring j has a considerably large set load (80 to 100 kg / cm ² ) in terms of its function, it is difficult and time-consuming to set the closing plate i while maintaining the pushed state of the movable pulley k. This is a cause of lowering the efficiency of assembly work. In the illustrated case, the closure plate i
Is positioned by its flange portion n, and is prevented from coming off by a snap ring O. Therefore, the closing plate i is fitted to the inner circumference of the cylindrical portion b and the snap ring O is attached to complete the setting. Also,
In the movable pulley k thus assembled, the fixed piston member g is returned by the restoring force of the spring j, and the flange portion e thereof is in pressure contact with the closing plate i. Then, the boss portion p of the pulley body d is fitted to the outer peripheral surface q of the mounting shaft c, and the boss portion r of the fixed piston member g is fitted to the outer peripheral surface s of the mounting shaft c, so that In the illustrated example, the fixed piston member g is positioned in the axial direction by bringing the inner end surface t of the boss portion r into contact with the step end surface u of the attachment c, and the fixed end piston member g is also attached to the outer end surface v of the boss portion r. Abutting on the end surface of the bearing w
Along with that, it prevents movement in the axial direction.

Therefore, in view of the above problems, the present invention provides a movable pulley mounting shaft having a structure that facilitates setting of a closing plate when assembling the movable pulley. It is intended.

(Structure of the Invention) In order to achieve the above object, the present invention has a disc-shaped portion and a cylindrical portion integrally formed at the rear portion of the disc-shaped portion, and is non-rotatable around the mounting shaft and moves in the axial direction. A pulley body that is fitted and mounted so that it can be fitted, and an outer circumference of a flange portion is fitted to an inner circumference of the cylindrical portion so that the pulley body is slidable along the axial direction, and an axial direction is formed on the outer circumference of the mounting shaft. A fixed piston member that is fitted and mounted so that it cannot be moved to and the flange portion cooperates with the disc-shaped portion to form a first pressure chamber in the cylindrical portion; and a fixed piston member that cooperates with the flange portion. A closing plate fitted and fixed to the inner periphery of the cylindrical portion so as to form a second pressure chamber in the cylindrical portion,
A movable pulley including a coil-shaped spring interposed between the disc-shaped portion and the flange portion in the first pressure chamber, wherein the pulley main body, the spring, the fixed piston member are provided on the mounting shaft. When the closing plates are attached in order, the fixing piston member is temporarily fixed to a position on the attachment shaft that does not interfere with the attachment of the closing plate against the biasing force of the spring. The fixed piston member is mounted on the mounting shaft with the fixing member and the end portion of the mounting shaft screwed and tightened to release the contact with the temporary fixing member against the biasing force of the spring. A temporary fixing member that prevents the temporary fixing member from coming off from the mounting shaft even in a state in which the screw member that is fixed to the predetermined mounting position and the temporary fixing member and the fixed piston member are released from contact with each other. And a member holding means, in which the fixing piston member to the temporarily fixed member when loosened the screw member is to be re-contact.

(Embodiment of the Invention) An embodiment of the present invention will be specifically described below with reference to FIGS. 1 and 2. 1 shows the structure of an automatic continuously variable transmission for a vehicle, and the present invention is applied to a driven shaft to which a movable pulley of a driven shaft pulley described later is attached.

In the figure, 1 is a casing, 2 is a drive shaft, 3 is a driven shaft, 4 is a hydraulic pressure (hydraulic pressure) which is installed on the drive shaft 2 and transmits the rotational power of the output shaft 6 of the internal combustion engine 5 to the drive shaft 2. Type starting clutch, 7 is a drive shaft pulley similarly installed on the drive shaft 2, 8 is a driven shaft pulley installed on the driven shaft 3, and 9 is wound around the drive shaft pulley 7 and the driven shaft pulley 8. It is an endless belt (steel belt) that is transmitted and transmits the rotational power of the drive shaft 2 to the driven shaft 3.

The drive shaft pulley 7 is a starting clutch 4 for the drive shaft 2.
A disk-shaped fixed pulley 10 integrally formed on the outer circumference,
It comprises a movable pulley 11 facing the fixed pulley 10 and fitted on the outer periphery of the drive shaft 2 so as to be slidable and non-rotatable along the axial direction thereof. The movable pulley 11 has a disk-shaped portion 15 having a hole 12 slidably fitted to the drive shaft 2 and an inclined surface 14 forming a V groove with the inclined surface 13 of the fixed pulley 10, and the disk-shaped portion 15. A pulley main body 17 having a cylindrical portion 16 integrally formed in the rear portion thereof and an outer peripheral surface of a flange portion 18 fixedly fitted to the outer periphery of the drive shaft 2 so as not to move in the axial direction.
A fixed piston member in which 19 is fitted to the inner peripheral surface 20 of the cylindrical portion 16 so that the pulley body 17 can slide along the axial direction.
21 and a closing plate 22 fitted and fixed to the inner peripheral surface 20 of the cylindrical portion 16 of the pulley body 17. The pulley body 17 is made non-rotatable by a ball 25 fitted in grooves 23, 24 formed along the axial direction of the outer peripheral surface of the drive shaft 2 and the hole 12. The outer peripheral surface 19 of the flange portion 18 of the fixed piston member 21 has an inner peripheral surface of the cylindrical portion 16 with a seal member 27 fitted in an annular groove 26 formed in the outer peripheral surface 19.
It is in liquid tight contact with 20.

In such a movable pulley 11, the pulley body 17
A first pressure chamber 28 and a second pressure chamber 29 are provided inside the cylindrical portion 16. The first pressure chamber 28 is a disk-shaped portion of the pulley body 17.
It is formed between 15 and the flange portion 18 of the fixed piston member 21, and the second pressure chamber 29 is formed between the flange portion 18 of the fixed piston member 21 and the closing plate 22.

In the first pressure chamber 28, pressure fluid (pressure oil) sent from a pressure fluid supply source (pump) (not shown) is supplied from the port 30 formed in the casing 1 as shown by the arrow (a) to the drive shaft 2 It is supplied through a pressure fluid communication path 31 formed in the axis center of the drive shaft, and a port 32 formed in the peripheral wall of the drive shaft 2 in the radial direction. In this way, the pressure fluid becomes the first pressure chamber.
When supplied to the inside of the pulley 28, the pressure of the pressure fluid causes the pulley body 17
Moves on the drive shaft 2 to the fixed pulley 10 side. At this time, a part of the pressure fluid supplied into the first pressure chamber 28 flows (leaks) into the second pressure chamber 29 via the orifice 33 provided in the flange portion 18.

The driven shaft pulley 8 is a disk-shaped fixed pulley 34 integrally formed on the outer circumference of the driven shaft 3, and is slidable on the outer circumference of the driven shaft 3 in the axial direction so as to face the fixed pulley 34. And a movable pulley 35 fitted so as not to rotate. The movable pulley 35 has a disk-shaped portion 39 having a hole 36 slidably fitted in the driven shaft 3 and an inclined surface 38 forming a V groove with the inclined surface 37 of the fixed pulley 34, and the disk-shaped portion 39. A pulley main body 41 having a cylindrical portion 40 integrally formed in the rear portion thereof and a driven shaft 3 are fitted and fixed to the outer periphery of the driven shaft 3 in a state in which axial movement is impossible, and the outer peripheral surface 43 of the flange portion 42 is formed into the cylinder. A fixed piston member 45 in which a pulley main body 41 is slidably fitted in the inner peripheral surface 44 of the portion 40 along the axial direction, and a fixed piston member 45 is fitted and fixed to the inner peripheral surface 44 of the cylindrical portion 40 of the pulley main body 41. Closed block 46
And a disc-shaped portion 39 of the pulley main body 41 for the purpose of giving an appropriate tension to the endless belt 9 when the internal combustion engine 5 is stopped and setting the pulley main body 41 to the low speed side (state shown) which is the initial position. The fixed piston member 45
And a coil-shaped spring 47 interposed between the flange portion and the flange portion. The pulley body 41 is made non-rotatable by balls 50 fitted in grooves 48, 49 formed in the outer peripheral surface of the driven shaft 3 and the hole 36 along the axial direction. Further, the outer peripheral surface 43 of the flange portion 42 of the fixed piston member 45.
Is in liquid-tight contact with the inner peripheral surface 44 of the cylindrical portion 40 via a seal member 52 fitted in an annular groove 51 formed in the outer peripheral surface 43.

In such a movable pulley 35, the pulley body 41
A first pressure chamber 53 and a second pressure chamber 54 are provided in the cylindrical portion 40. The first pressure chamber 53 is a disc-shaped portion of the pulley body 41.
It is formed between 39 and the flange portion 42 of the fixed piston member 45, and the second pressure chamber 54 is formed between the flange portion 42 of the fixed piston member 45 and the closing plate 46.

The pressure fluid sent from the pressure fluid supply source enters the first pressure chamber 53 as shown in the arrow (b).
From a port 55 formed in the driven shaft 3 through a pressure fluid communication path 56 formed in the shaft center of the driven shaft 3 and a port 57 formed in the peripheral wall of the driven shaft 3 along the radial direction. When the pressure fluid is thus supplied into the first pressure chamber 53, the pulley body 41 moves on the driven shaft 3 by the pressure of the pressure fluid.
Move to side 34. At this time, part of the pressure fluid supplied into the first pressure chamber 53 flows (leaks) into the second pressure chamber 54 via the orifice 58 provided in the flange portion 42.

In the movable pulley 35 of the driven shaft pulley 8, the boss portion 59 of the pulley body 41 is fitted to the outer peripheral surface 60 of the driven shaft 3, and the boss portion 61 of the fixed piston member 45 is fitted to the outer peripheral surface 62 of the driven shaft 3. As a result, the fixed piston member 45 is positioned by bringing the inner end surface 63 of the boss portion 61 into contact with the stepped end surface 64 of the driven shaft 3 and is attached to the outer peripheral surface of the driven shaft 3.
A collar 67 interposed between the outer end surface 65 of 61 and the end surface of the bearing 66 prevents axial movement together with the bearing 66.

On the outer peripheral surface 62 of the driven shaft 3, there is formed an annular groove 69 into which a half cotter (temporary fixing member) 68 for fixing the fixed piston member 45 fitted to the outer peripheral surface 62 in the axial direction is fitted. Has been done. As shown in FIG. 2, the annular groove 69 is slightly outward from the outer end surface 65 of the boss 61 when the inner end surface 63 of the boss 61 of the fixed piston member 45 is in contact with the step end surface 64. Is formed on the outer peripheral surface 62 portion. In addition, the outer end surface 65 of the boss portion 61 has an inner diameter slightly larger than the outer diameter of the half cotter 68 (when fitted in the annular groove 69) and a depth approximately the same as the thickness of the half cotter 68. A recess 70 having is formed,
On the inner end surface of the collar 67, a recess 71 having the same inner diameter as the recess 70 and a depth larger than the thickness of the half cotter 68 is formed.

Next, the procedure for assembling the movable pulley 35 will be described.

In the case of the conventional structure, the movable pulley 35 is attached to the driven shaft 3 after the assembling is completed, but in the case of the embodiment, it is assembled on the driven shaft 3.

That is, the pulley main body 41 is fitted into the outer peripheral surface 60 of the driven shaft 3 so as to face the fixed pulley 34, and then the spring 47,
The fixed piston member 45 and the closing plate 46 are assembled to the pulley main body 41 in this order. When the fixed piston member 45 is attached, as shown in FIG. The spring 47 is compressed by the flange portion 42 until it comes into contact with the end face 64, and is moved on the driven shaft 3. Then, while maintaining the abutting state, as shown in FIG. 4, the half cotter 68 is fitted into the annular groove 69 provided on the outer peripheral surface 62 to remove the pushing force applied to the fixed piston member 45. Then, as shown in FIG. 5, the fixed piston member 45 moves backward along the axial direction on the driven shaft 3 by the elastic force of the spring 47 until the end surface of the recess 70 of the boss portion 61 comes into contact with the half cotter 68. However, when they come into contact with each other, the half cotter 68 prevents them from moving in the axial direction and is temporarily fixed on the driven shaft 3. In this state, the flange portion 42 of the fixed piston member 45 has the closing plate.
It is located inside the set position of 46. Therefore, the closing plate 46 to be attached next can be easily fitted to the inner peripheral surface 44 of the cylindrical portion 40 of the pulley body 41 without being affected by the spring 47. The closing plate 46 is axially positioned by the flange 72 and is prevented from coming off by the snap ring 73.

When the movable pulley 35 is assembled on the driven shaft 3 as described above, the collar 67 is fitted to the outer peripheral surface 62 of the driven shaft 3 as shown in FIG. After this, the gears 74,
The washer 75 and the nut 76 are mounted. When the nut 76 is turned in the tightening direction, the collar 67 moves on the driven shaft 3 to the fixed pulley 34 side via the washer 75, the gear 74 and the bearing 66.
Accordingly, the fixed piston member 45 is thereby moved on the driven shaft 3 until the inner end surface 63 of the boss 61 abuts the step end surface 64 as shown in FIG. As a result, the fixed piston member
45 is positioned and set at a predetermined position on the driven shaft 3, and the fixed piston member 45 and the bearing are fixed by the collar 67.
66 is prevented from moving axially. Fixed piston member 45
When the collar is pushed by the collar 67 and moves on the driven shaft 3, the collar 67
Since the stepped portion 71 avoids the half-divided cotter 68, it can be moved without trouble. In addition, the half cotter 68 fitted in the annular groove 69 for temporary fixing is provided with the recess 70 of the boss 61 and the collar.
Since the fixed piston member 45 is located in the space formed by the recess 71 and the fixed piston member 45, the fixed piston member 45 can be mounted as it is without being removed. In the embodiment, the half cotter 68 is used as the temporary fixing member for temporarily fixing the fixed piston member 45 on the driven shaft 3, but it is also possible to use a knock pin or the like.

(Effects of the Invention) In summary, the movable pulley mounting shaft according to the present invention has the disc-shaped portion and the cylindrical portion integrally formed at the rear portion of the disc-shaped portion, and is non-rotatable on the outer periphery of the mounting shaft and has the axis line. And a pulley body that is fitted and mounted so as to be movable in the direction, and the outer circumference of the flange portion is fitted to the inner circumference of the cylindrical portion so that the pulley body can slide along the axial direction and the outer circumference of the mounting shaft. A fixed piston member that is fitted and mounted in a state where it cannot move in the axial direction, and the flange portion cooperates with the disc-shaped portion to form a first pressure chamber in the cylindrical portion; and the flange portion. Second in cooperation with the cylindrical part
A closing plate fitted and fixed to the inner periphery of the cylindrical portion so as to form a pressure chamber, and a coil-shaped spring interposed between the disc-shaped portion and the flange portion in the first pressure chamber. When the pulley main body, the spring, the fixed piston member, and the closing plate are mounted on the mounting shaft in this order, the fixed piston member is brought into contact with the fixed piston member to mount the closing plate. A temporary fixing member for temporarily fixing against a biasing force of the spring at a position on the mounting shaft which does not hinder, and a biasing force of the spring by being screwed to the end of the mounting shaft and tightened. The contact between the temporary fixing member and the screw member for fixing the fixed piston member to a predetermined mounting position on the mounting shaft in the state where the contact with the temporary fixing member is released is released. State smell Also a temporary fixing member retaining means for preventing the temporarily fixed member disengaging escape from the mounting shaft,
When the screw member is loosened, the fixed piston member is re-contactable with the temporary fixing member.

Therefore, when the fixed pulley member is mounted on the shaft when the movable pulley is mounted, the outer end surface of the boss portion fitted with the outer peripheral surface of the shaft is first mounted to a position beyond the mounting portion of the temporary fixing member. If the temporary fixing member is attached to the mounting portion by moving the spring by compressing the spring, the fixed piston member comes into contact with the temporary fixing member to prevent the movement in the axial direction, and as a result, the closing plate is affected by the spring. It can be easily installed without receiving it. Further, even when the screw member is tightened or loosened, the temporary fixing member is held on the mounting shaft by the temporary fixing member holding means, so that the temporary fixing member may be dislodged from the mounting shaft in an undesired manner. There is no.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of an automatic continuously variable transmission for a vehicle to which the present invention is applied, FIG.
FIG. 5 is a cross-sectional view showing the procedure for attaching the fixed piston member when assembling the movable pulley, and FIG. 6 is a cross-sectional view showing the conventional movable pulley. 3 …… Driven shaft (mounting shaft), 35 …… Movable pulley, 39 …… Disk-shaped part, 40 …… Cylinder part, 41 …… Pulley body, 42 ……
Flange, 43 ... Outer surface, 44 ... Inner surface, 45 ... Fixed piston member, 46 ... Closure plate, 47 ... Spring, 53 ... First
Pressure chamber, 54 ... Second pressure chamber, 61 ... Boss part, 62 ... Outer peripheral surface, 65 ... Outer end surface, 68 ... Half cotter (temporary fixing member),
69 …… annular groove.

Claims (1)

[Claims] 1. A pulley main body having a disc-shaped portion and a cylindrical portion integrally formed at a rear portion of the disc-shaped portion, and being fitted and mounted on the outer periphery of a mounting shaft so as to be non-rotatable and movable in the axial direction. , The outer circumference of the flange portion is fitted to the inner circumference of the cylindrical portion so that the pulley main body can slide along the axial direction, and the outer circumference of the mounting shaft is fitted so as to be immovable in the axial direction. A fixed piston member which is fitted together and whose flange portion cooperates with the disc-like portion to form a first pressure chamber in the cylindrical portion; and a second pressure chamber in the cylindrical portion which cooperates with the flange portion. A movable member including a closing plate fitted and fixed to the inner circumference of the cylindrical portion so as to form, and a coil-shaped spring interposed between the disc-shaped portion and the flange portion in the first pressure chamber. In the pulley, the pulley body is mounted on the mounting shaft. Said spring, said fixing piston member,
When the closing plates are attached in order, the fixing piston member is temporarily fixed to a position on the attachment shaft that does not interfere with the attachment of the closing plate against the biasing force of the spring. By fixing the fixing member and the end of the mounting shaft by screwing and tightening, the contact between the temporary fixing member and the temporary fixing member is released against the biasing force of the spring, and the fixing piston member is fixed to the mounting shaft. Temporary fixing member holding for preventing the temporary fixing member from coming off from the mounting shaft even in a state in which the screw member fixed to the predetermined mounting position above and the temporary fixing member and the fixed piston member are released from each other. Means, wherein the fixed piston member is re-contactable with the temporary fixing member when the screw member is loosened.