JPH04194439A - Variable speed pulley device - Google Patents

Abstract

PURPOSE:To lighten the weight and miniaturize the device by energizing one of each drive and driven use pulley flange to the other by each drive and driven use spring and a belt in a diametric direction by drive and driven use piston means. CONSTITUTION:A hydraulic control means controls a pressure of oil in back surface parts 22a, 42a of pistons 22, 42 to change a protruding amount of the pistons 22, 42 from cylinders 21, 41. In the drawing, the protruding amount of the piston 22 is minimum, the protruding amount of the piston 42 is maximum, and deceleration ratio of a drive shaft 11 to a driven shaft 31 is maximum. From this condition, when the protruding amount of the piston 42 is decreased by increasing the protruding amount of the piston 22 through the hydraulic control means, a drive use pulley flange 14 is energized to a flange 13 by a drive use spring 61 in a side of the drive shaft 11, so that a diametric directional position of a belt 55 is moved to the periphery, to separate a driven use pulley flange 34 from a flange 33 against a driven use spring 62 in a side of the driven shaft 31, and to the internal peripheral to increase acceleration ratio maximum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a variable speed pulley device, and can be applied, for example, to a pulley device for driving auxiliary equipment of an automobile engine.

(Prior art) As a prior art related to the present invention, for example, Japanese Patent Application Laid-Open No. 1-3
There is one disclosed in Publication No. 360.

In this prior art, a driving pulley is formed by a pair of pulley flanges disposed on a drive shaft, and a driven pulley is formed by a pair of pulley flanges disposed on a driven shaft. - Here, in the drive pulley, one of the pair of pulley flanges (or both is possible) is arranged to be slidable in the axial direction of the drive shaft.

Therefore, the spacing between the pulley flanges can be varied. This also applies to the driven pulley.

Therefore, by stretching a belt between each pulley and changing the distance between the pulley flanges of each pulley, it is possible to change the acceleration/deceleration ratio between the drive shaft and the driven shaft.

For this device! ! Generally speaking, the device used in this study is C■T (C
ONTINUEOUS VARIABLE TRANS
It has been put into practical use as MI SS 10N).

(Problem to be Solved by the Invention) However, the above-mentioned conventional device uses cam means disposed on each shaft in order to change the distance between the pulley flanges, but this cam means has a large In order to accommodate the pulley device that transmits torque, an increase in size and weight is unavoidable.

It is impossible to apply such a large component to the pulley device for driving the auxiliary equipment of an automobile engine due to the installation space problem, and even if it were installed, it would increase the weight of the automobile itself and worsen fuel efficiency. This has the problem of inviting

Therefore, the present invention aims to reduce the weight and size of a variable speed pulley device as a technical objective.

[Structure of the invention]

(Means for Solving the Problems) The technical means of the present invention taken to solve the above-mentioned technical problems of the present invention include a drive shaft and a pair of drives slidably disposed on the drive shaft. A driving pulley consisting of a pulley flange for driving, a driven shaft disposed apart from the driving shaft, a driven pulley consisting of a pair of driven pulley flanges slidably disposed on the driven shaft, In a variable speed pulley device having a belt stretched between a pulley and a driven pulley, a driving spring biases one of the driving pulley flanges toward the other, and a driven spring biases the driven pulley flange. One of the belts is biased toward the other, and driving piston means and driven piston means are disposed on the drive shaft and driven shaft, respectively, and both piston means bias the belt in its radial direction. .

(Function) According to the technical means of the present invention described above, the belt radius in the drive and driven pulleys can be changed by the piston means of the small and light lid, and the increase/deceleration ratio between the drive shaft and the driven shaft can be changed. can be changed.

(Example) An example embodying the technical means of the present invention will be described below based on the accompanying drawings.

In the figure, a drive pulley 12 is disposed on a drive shaft 11 of a variable speed pulley device 10, and this drive pulley 12 is comprised of a pair of drive pulley flanges 13 and 14. Here, the drive shaft 11 is directly or indirectly connected to a crankshaft of an engine (not shown).

The drive pulley flange 13 is fixed to the drive shaft 11 via a key (not shown) so that it cannot rotate relative to the drive shaft 11, and the drive pulley flange 14 cannot rotate relative to the drive shaft 11, but at the same time can slide in the axial direction of the drive shaft 11. It is arranged so that it can be moved.

That is, a helical spline is formed on the inner and outer circumferential surfaces of the helical follower 16 supported by the drive shaft 11 via a bearing 15, and the outer circumferential surface of the drive shaft 11 and the inner and outer circumferential surfaces of the cylindrical portion 14a of the drive pulley flange 14. , and this cylinder part 1
A helical spline is also formed on the inner peripheral surface of the helical outer 18 supported by the helical outer 18 via the bearing 17,
Each helical spline meshes with each other. In addition, the inner ring (not shown) of the bearing 15 is connected to the bolt 1.
9 is fixed to the drive shaft 11.

The driving spring 61 is disposed between the illustrated lower end of the helical follower 16 and the illustrated upper end of the bearing 17, and biases the driving pulley flange 14 toward the driving pulley flange 13.

A driving piston means 20 is provided between the driving pulley flange 13 and the driving pulley flange 14 inside the drive shaft 11.
is provided, and this driving piston means 20 is connected to the cylinder 2
1, a piston 22 and a hydraulic passage 23.

The cylinder 21 and the piston 22 extend perpendicularly to the axial direction of the drive shaft 11, and although only two are shown in the figure, there are many cylinders 21 and pistons 22 at certain intervals in the radial direction of the drive shaft 11-. are doing. Further, the hydraulic passage 23 communicates a hydraulic pressure supply means (not shown) (consisting of a hydraulic pump, a hydraulic switching valve, etc.) with the back surface 22a of the piston 22.

On the other hand, a driven pulley 32 is disposed on a driven shaft 31 which is arranged apart from the drive shaft 11, and this driven pulley 32 is composed of a pair of driven pulley flanges 33 and 34. The driven pulley flange 33 and the output pulley 51 are fixed to the driven shaft 31 via a key 52 so that they cannot rotate relative to each other.
At the same time, the output pulley 51 is fixed to the driven shaft 31 by a bolt 53. Further, the driven pulley flange 34 is disposed so that it cannot rotate relative to the driven shaft 31 and at the same time is slidable in the axial direction of the driven shaft 31.

That is, a helical spline is formed on the inner and outer circumferential surfaces of the helical follower 36 that is fixed to the block 54 via the port 35, and the outer circumferential surface of the driven shaft 31 and the inner and outer circumferential surfaces of the cylindrical portion 34a of the driven pulley flange 34. , and this cylindrical portion 34
Helical splines are also formed on the inner circumferential surface of the helical outer 38 supported by the helical outer 38 via a bearing 37, and the helical splines mesh with each other.

The driven spring 62 is disposed between the illustrated upper end of the helical follower 36 and the illustrated lower end of the bearing 37, and biases the driven pulley flange 34 toward the driven pulley flange 33.

A driven piston means 4 is provided between the driven pulley flange 33 and the driven pulley flange 34 inside the driven shaft 31.
This driven piston means 40 is composed of a cylinder 41, a piston 42, and a hydraulic passage 43.

The cylinder 41 and the piston 42 extend perpendicularly to the axial direction of the driven shaft 31, and although only two are shown in the figure, there are many cylinders 41 and pistons 42 spaced apart from each other in the radial direction of the driven shaft 31. ing. Further, the hydraulic passage 43 communicates a hydraulic pressure supply means (not shown) (consisting of a hydraulic pump, a hydraulic switching valve, etc.) with the back surface 42a of the piston 42.

Note that both on the drive shaft ll side and on the driven shaft 31 side,
Although helical splines are used, non-helical splines parallel to each axis direction may also be used.

Here, a belt 55 is stretched between the driving pulley 12 and the driven pulley 32. Further, 56 indicates an output belt that connects the output pulley and an auxiliary drive pulley (not shown).

The operation of the variable speed pulley device 10 having the above configuration will be explained below. "The drive shaft 11 is rotated by the engine, and its rotational torque is transmitted to the drive pulley 12. That is, the drive pulley flange 13 is fixed integrally with the drive shaft 11, and the drive pulley flange 14 is This is because they are engaged by a helical spline.

The rotational torque of the driving pulley 12 is transmitted to the driven pulley 33 via the belt 55, and similarly rotates the driven shaft 31. The rotational torque of the driven shaft drives the auxiliary equipment from the pulley 51 via the output belt 56. Here, the auxiliary equipment includes, for example, a water pump, a hydraulic pump, an air conditioner compressor, and the like.

At this time, the hydraulic control means controls the back surface 22a of the piston 22.
The hydraulic pressure of the back surface 42a of the piston 42 is controlled to change the amount of protrusion of the pistons 22, 42 from the cylinders 21, 41. In the drawing, the amount of protrusion of the piston 22 is the minimum, and the amount of protrusion of the piston 42 is the maximum. Therefore, the speed increasing ratio between the drive shaft 11 and the driven shaft 31 is maximum.

In order to lower the speed increasing ratio from this state, the hydraulic control means gradually raises the protruding cover of the piston 22 and gradually lowers the protruding cover of the piston 42. At this time, the rate of change in the amount of protrusion of both pistons 22 and 42 is the same.

At this time, on the drive shaft 11 side, the action of the drive spring 61 urges the drive pulley flange 14 toward the drive pulley flange 13, so the radial position of the heald 55 gradually moves toward the outer periphery, and the belt 55 Since the length is always constant, on the driven shaft 31 side, the driven pulley flange 34 moves away from the driven pulley flange 13 against the urging force of the driven spring 62, and the radial position of the belt 55 gradually changes. Moving towards the inner circumference.

Then, when the amount of protrusion of the piston 22 becomes the maximum and the amount of protrusion of the piston 42 becomes the minimum, the drive shaft 11 and the driven shaft 31
The reduction ratio is the minimum. This state is shown in the drawing as 2
This is indicated by a dashed dotted line 63.

Moreover, both pistons 22 and 42 can maintain their protrusion amounts at arbitrary positions.

Such variation in the increase/deceleration ratio between the drive shaft 11 and the driven shaft 31 is effective because the engine speed changes. In other words, if the increase/deceleration ratio of the pulley device is always constant as in the past, the auxiliary equipment rotation speed depends on the engine rotation speed, so in high-speed engines, the reduction ratio must be increased to protect the auxiliary equipment. This is because there is a disadvantage that the performance of the auxiliary equipment cannot be fully demonstrated in the low rotation range.

In this embodiment, an output pulley is separately provided for driving the auxiliary equipment, but the auxiliary equipment may be directly driven by the driven shaft.

〔Effect of the invention〕

As described above, in the present invention, the belt radius in the driving and driven pulleys can be changed using a small and lightweight piston means, and the increase/deceleration ratio between the driving shaft and the driven shaft can be changed.

Therefore, it is advantageous for mounting on automobiles and the like.

[Brief explanation of the drawing]

The drawing shows a cross-sectional view of a variable speed pulley device 10 according to an embodiment of the present invention. lO... variable speed pulley device, 11... drive shaft, 12
... Drive pulley, 13.14... Drive pulley flange, 20... Drive piston means, 31...
・Driven shaft, 32... Driven pulley, 33.34・
... Driven pulley flange, 40... Driven piston means, 55... Belt, 61... Driving spring, 62... Driven spring.

Claims (1)

[Scope of Claims] A drive shaft, a drive pulley consisting of a pair of drive pulley flanges slidably disposed on the drive shaft, and a driven shaft disposed apart from the drive shaft; A variable speed pulley device comprising: a driven pulley consisting of a pair of driven pulley flanges slidably disposed on the driven shaft; and a belt stretched between the driving pulley and the driven pulley. , a driving spring urges one of the driving pulley flanges toward the other, a driven spring urges one of the driven pulley flanges toward the other, and the driving shaft and the driven shaft are respectively A variable speed pulley device, comprising: a driving piston means and a driven piston means, the piston means urging the belt in a radial direction thereof.