JPH06129506A - Belt type continuously variable transmission - Google Patents

Abstract

PURPOSE:To block spring force easily from a belt for release of belt tension in installing work. CONSTITUTION:This stepless transmission is provided with a pair of speed change pulleys 5, 7, a spring 55 for giving tension to a belt 53, a speed change operating means 61, an axial hole 67 and a diametrical hole 69 formed in the shaft 29 of a fixing flange 31, and a recessed part 71 formed in a movable flange 33. A ball 73 put in the diametrical hole 69 is pressed by a fixture 75 fitted into the axial hole 67 to engage it with the recessed part 71 of the movable flange 33, so that the movable flange 33 can be locked temporarily to the fixing flange 31 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt type continuously variable transmission.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show conventional belt type continuously variable transmissions 201 and 203. The transmission 201 has fixed flanges 205 and 207 and movable flanges 209 and 211, respectively.
Belt 2 mounted with V-grooves 217 and 219 formed by a pair of speed change pulleys 213 and 215 having flanges
In the speed change pulley 213, the movable flange 209 is pressed to the fixed flange 205 side by the disc spring 223 to apply tension to the belt 221, and in the speed change pulley 215, the movable flange 211 is moved to the fixed flange 207 side by hydraulic pressure. It is configured to press and change the belt pitch diameter of each transmission pulley 213, 215 to adjust the transmission ratio.

Further, the transmission 203 is disclosed in Japanese Patent Laid-Open No. 2-18034.
No. 4, which is described in Japanese Patent Laid-Open No. 4 (1994), and has fixed flanges 225 and 227 and movable flanges 229 and 231 respectively.
And a pair of speed change pulleys 233, 235 are connected by a belt 237 mounted between the flanges, and the movable flanges 229, 231 are coil springs 239, 2 respectively.
The belt 237 is pressed against the fixed flanges 225 and 227 by 41 so that tension is applied to the belt 237.
This is performed by the centrifugal cam 243 provided on the reference numeral 33.

In addition to these, there is a belt type continuously variable transmission configured to apply tension to the belt by hydraulic pressure. However, compared to such a transmission, the disc spring 223 does not use hydraulic pressure for obtaining tension. The above-described transmissions 201 and 203 using the coil springs 239 and 241 are simple in structure, small in size, light in weight, and low in cost.

[0005]

If the belt tension is obtained by hydraulic pressure, the belt can be easily assembled after the hydraulic pressure is released without tension on the belt. However, for example, in the case of the transmission 201, when assembling, the nut 24 on the transmission pulley 213 side is attached.
After tightening No. 5 and applying an initial load to the disc spring 223, the nut 247 on the speed change pulley 215 side is tightened, and the taper of the V groove 219 moves the belt 221 to the outside in the radial direction to narrow the flange interval to a predetermined value. However, since tension is applied to the belt 221 by the disc spring 223, the belt 221 is difficult to move, and the nut 247 must be tightened while rotating the speed change pulleys 213 and 215, resulting in extremely poor workability.

On the other hand, in the transmission 203, the movable flanges 229 and 23 are fixed by the jig 249 and the bolts 251 and 253.
1 is moved in the direction away from the fixing flanges 225 and 227 so that tension is not applied to the belt 237 to facilitate the assembly. However, in this case as well, a plurality of bolts must be tightened for each transmission pulley, and the work including the removal of the bolts after assembly is troublesome.

Therefore, an object of the present invention is to provide a belt type continuously variable transmission which can release the belt tension by cutting off the spring force from the belt by an easy work for assembling.

[0008]

A belt type continuously variable transmission according to the present invention is connected to each other via a belt mounted between each fixed flange and a movable flange, and each belt pitch diameter is changed by a change in flange spacing. And a pair of speed change pulleys for changing the speed change ratio, and a spring for pressing the movable flange of the speed change pulley toward the fixed flange to apply tension to the belt,
A gear shift operation means for pressing the movable flange of the gear shift pulley against the belt tension against the fixed flange side to change the gear ratio, and an axial hole provided on the shaft of the fixed flange in the gear shift pulley in which the spring is mounted and communicating with each other. The movable flange includes a radial hole and a concave portion provided in the movable flange, and a ball placed in the radial hole is pushed by a jig attached to the axial hole to engage with the concave portion of the movable flange to fix the movable flange to the fixed flange. It is characterized in that it can be temporarily fixed to the side.

[0009]

In operation, the ball is inserted into the radial hole provided on the shaft of the fixed flange, and the ball is pushed into the concave portion of the movable flange by the shaft of the jig inserted into the axial hole to fix the movable flange to the fixed flange. Temporarily fasten it to the side and disconnect the spring force from the belt. In this state, tension is not applied to the belt even if an initial load is applied to the spring, so that the assembly can be easily performed unlike the conventional example shown in FIG. When the assembly is completed, the jig and balls are removed, and tension is applied to the belt so that the belt is ready for operation.

Unlike the conventional example shown in FIG. 4, since the screw is not tightened or removed, the jig can be easily attached and detached, and the ball can be easily attached and detached as compared with other shapes. The workability of releasing the belt tension is good.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS.
FIG. 1 shows a belt type continuously variable transmission 1 of this embodiment. The left and right directions are the left and right directions in FIG. 1, and members and the like without reference numerals are not shown.

This belt type continuously variable transmission 1 is used to drive a vehicle accessory, and includes a speed increasing gear set 3, a drive side speed changing pulley 5, and
It is composed of the driven side speed change pulley 7 and the like, and is housed in a casing 9 in which lubricating oil is sealed.

The speed increasing gear set 3 is composed of large and small gears 11 and 13 meshing with each other, and the large gear 11 is supported by a shaft 14 whose both ends are supported by a casing 9 via bearings 15 and 15, and 13 is fixed to a drive shaft 16, and the drive shaft 16 is supported by the casing 9 via bearings 17 and 18. The large gear 11 meshes with the output gear on the engine side, and the driving force of the engine is increased in speed by the speed increasing gear set 3 to rotate the drive shaft 16. A seal 19 is arranged between the pinion 13 and the casing 9.

The speed change pulley 5 is provided with a fixed flange 21 and a movable flange 23, which are integral with the drive shaft 16, and the movable flange 23 is formed between a dog clutch 27 formed between the movable flange 23 and a hub 25 splined to the outer periphery of the drive shaft 16. Is connected to the drive shaft 16 so as to be movable in the axial direction.

The speed change pulley 7 is provided with a fixed flange 31 and a movable flange 33 which are integrated with the driven shaft 29 (shaft), and the movable flange 33 is formed between the driven shaft 29 and a hub 35 which is splined to the outer periphery of the driven shaft 29. A dog clutch 37 is connected to the driven shaft 29 so as to be movable in the axial direction. The driven shaft 29 is supported by the casing 9 via bearings 39 and 41, and a pulley 43 is fixed to the left end portion penetrating the casing 9. This pulley 43 has each groove 4
Belts attached to 5, 47 are connected to the pulleys on the oil pump side and the alternator side. A seal 48 is arranged between the pulley 43 and the casing 9 to prevent oil from leaking to the outside.

The speed change pulleys 5 and 7 are connected to each other via a belt 53 mounted on V grooves 49 and 51 formed between the flanges. Movable flange 33 of speed change pulley 7 and hub 3
A disc spring 55 (spring) is arranged between the disc springs 5 and 5, and presses the movable flange 33 toward the fixed flange 31 to apply tension to the belt 53.

The hub 25 of the speed change pulley 5 is integrally formed with a partition wall 59 in which an O-ring 57 is disposed between the hub 25 and the movable flange 23. Operation means) is formed. Hydraulic pressure is supplied to the pressure chamber 61 from an oil pump via an oil passage 63 formed through the casing 9 and the drive shaft 16 and an oil plug 65, and presses the movable flange 23 toward the fixed flange 21 side.

When the hydraulic pressure is not supplied to the hydraulic chamber 61, in the speed change pulley 7, the flange spacing becomes minimum (belt pitch diameter R2 maximum) due to the biasing force of the disc spring 55 as in the lower half of FIG. In No. 5, as in the upper half of FIG. 1, the belt tension is received and the flange spacing becomes maximum (belt pitch diameter R1 minimum), and the speed increasing ratio becomes minimum.

When hydraulic pressure is supplied to the hydraulic chamber 61, the movable flange 23 is pressed in the transmission pulley 5 as in the lower half of FIG.
As shown in the upper half of FIG. 1, the belt tension increases the flange spacing in the transmission pulley 7, the belt pitch diameter R2 decreases, and the speed increasing ratio increases. If the hydraulic pressure is further applied to maximize the belt pitch diameter R1 and minimize R2, the speed increasing ratio is maximized.

The driving force of the engine input through the speed increasing gear set 3 is changed to a required rotation speed between the speed change pulleys 5 and 7 to rotationally drive the oil pump and the alternator.

In the speed change pulley 7, an axial hole 67 and a radial hole 69 which communicate with each other are provided on the right end side of the driven shaft 29, and a recess 71 is provided on the inner periphery of the movable flange 33. A steel ball 73 is formed in the radial hole 69 and the recess 71.
When the (ball) is engaged, the movable flange 33 moves the driven shaft 29.
Fixed to.

A jig 75 as shown in FIG. 2 is used to engage and disengage the steel ball 73. A head portion 79 is formed at one end of the shaft portion 77 of the jig 75, and a magnet 81 having a smaller diameter than the shaft portion 77 is attached to the other end by a screw 83.

Axial hole 67 and radial hole 69 of the driven shaft 29.
Is used as an oil passage after the end of assembly, and guides lubricating oil from the oil pump to the movable flange 33, the dog clutch 37, the disc spring 55, the bearing 41, etc., and lubricates them.

Thus, the belt type continuously variable transmission 1 is constructed.

Assembling of the belt type continuously variable transmission 1 is carried out with the belt tension released as follows.

First, before attaching the movable flange 33 of the speed change pulley 7 to the driven shaft 29, the steel balls 73, 73 are inserted into the radial holes 69 and the jig 75 is inserted into the axial direction holes 67, so that the speed change pulley 7 of FIG. As shown in the lower half, the steel ball 73 has a radial hole 69.
The magnet 81 is adsorbed in the state where it is inside. Next, when the movable flange 33 is attached to the driven shaft 29 from the head 79 of the jig 75 and the positions of the recess 71 and the radial hole 69 are aligned, as shown in the upper half of the speed change pulley 7 in FIG. Then, when the jig 75 is pushed to the left, the steel ball 73 is pushed out by the shaft portion 77 and engages with the recess 71.

In this state, the disc spring 55, the hub 35, and the bearing 41 are attached to the driven shaft 29 from the head 79 side of the jig 75, the dog clutch 37 is engaged, and then the driven shaft 29.
The nut 85 is tightened to apply an initial load to the disc spring 55. Even if an initial load is applied, no tension is applied to the belt 53. On the other hand, in the speed change pulley 5, the nut 87 of the drive shaft 16 is tightened to adjust the flange spacing to a required value. Since no tension is applied to the belt, unlike the conventional example of FIG. 3, it is not necessary to rotate the transmission pulleys 5 and 7, and tightening of the nut 87 is easy.

The concave portion 71 is opened in a V shape toward the radial hole 69, and when the jig 75 supporting the steel ball 73 is pulled out, the force of the disc spring 55 is exerted through the concave portion 71 so that the steel ball 73 has a diameter. It is pushed back from the direction hole 69 to the axial hole 67, adsorbed by the magnet 81, and taken out to the outside. When the steel ball 73 is removed, tension is applied to the belt 53 by the disc spring 55,
The belt type continuously variable transmission 1 becomes operable.

The jig 75 and the steel ball 73 can be easily attached and detached as described above without tightening and removing a large number of bolts as in the conventional example shown in FIG. The workability of releasing the belt tension is extremely good.

The belt type continuously variable transmission of the present invention may be constructed so that the belt tension is given by the springs mounted on both the speed change pulleys.

[0031]

According to the belt type continuously variable transmission of the present invention, the fixed flange side and the movable flange of the speed change pulley are temporarily fixed via balls to interrupt the spring force and release the belt tension. It is easy to assemble, and the work of releasing the belt tension is very good because it is configured so that the ball can be easily engaged and disengaged by pushing and pulling the shaft of the jig into the axial hole provided in the shaft of the fixed flange. .

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a side view of a jig used in this embodiment.

FIG. 3 is a sectional view of a conventional example.

FIG. 4 is a sectional view of another conventional example.

[Explanation of symbols]

 1 Belt Type Continuously Variable Transmission 5, 7 Variable Speed Pulley 21, 31 Fixed Flange 23, 33 Movable Flange 29 Driven Shaft (Axis) 53 Belt 55 Disc Spring (Spring) 61 Pressure Chamber (Shift Operation Means) 67 Axial Direction Hole 69 Diameter Direction hole 71 Recess 73 Steel ball 75 Jig 77 Shaft R1 and R2 Belt pitch diameter

Claims (1)

[Claims] 1. A pair of speed change pulleys, which are connected to each other via a belt mounted between a fixed flange and a movable flange and change each belt pitch diameter according to a change in flange spacing to change a speed ratio, and a movable flange of the speed change pulley. A spring for pressing the fixed flange side to give tension to the belt, a shift operating means for pushing the movable flange of the shift pulley against the belt tension to the fixed flange side to change the gear ratio, and a shift equipped with the spring. A jig provided with an axial hole and a radial hole which are provided in the shaft of a fixed flange in the pulley and communicate with each other, and a recess provided in the movable flange, and in which a ball placed in the radial hole is mounted in the axial hole. A belt-type continuously variable transmission characterized in that the movable flange can be temporarily fixed to the fixed flange side by being pushed by to be engaged with the concave portion of the movable flange.