JPH1172151A - Pulley device for belt type continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulley device for a belt type continuously variable transmission whose manufacturing cost can be reduced and which can make common use of a movable sheave in spite of a change in a cylinder diameter of a movable cylinder and on which internal maintenance of a hydraulic servo mechanism can also be performed. SOLUTION: This pulley device 1 has a hydraulic servo mechanism 5 having a structure to form hydraulic a chamber 8 between a movable cylinder 6 fixed to a movable sheave 4 and a fixed plunger 7 locked on a pulley shaft 2, and the movable cylinder 6 has an annular disk part 6b coming into contact with a back face of the movable sheave 4, a cylinder large diameter part 6c which continues with an outer periphery of the annular disk part 6b and to which the fixed plunger 7 is slidingly fitted and a fitting part 6a which is positioned on the inner peripheral side of the annular disk part 6b and is pressed in a hub of the movable sheave 4, and this fitting part 6a is pressed in the hub of the movable sheave 4, and in a condition where the annular disk part 6b is brought into contact with the back face of the movable sheave 4, the movable cylinder 6 is fixed to the movable sheave 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulley device of a belt type continuously variable transmission used as, for example, a continuously variable transmission for a vehicle, and more particularly to a movable cylinder fixed to a movable sheave and a pulley shaft. The present invention relates to a pulley device of a belt-type continuously variable transmission including a hydraulic servo mechanism having a structure in which a hydraulic chamber is formed between a stationary plunger and a stationary plunger.

[0002]

2. Description of the Related Art As a belt-type continuously variable transmission used for a vehicle, a drive belt composed of a number of metal elements is wound between an input primary pulley and an output secondary pulley whose groove widths are variably controlled. A hung structure is generally known.

As shown in FIG. 3, for example, each of the pulleys has a fixed sheave b integral with a pulley shaft a, and a movable sheave b fitted to the pulley shaft a so as to be able to come and go with the fixed sheave b. The groove width is variable with the sheave c, and a hydraulic servo mechanism d for driving the movable sheave c toward and away from the fixed sheave b is additionally provided.

The hydraulic servo mechanism d is provided between a movable cylinder e fixed to a movable sheave c and a fixed plunger f fitted slidably to the movable cylinder e and locked to a pulley shaft a. A hydraulic chamber g is formed.
As the movable sheave c moves closer to the fixed sheave b by the hydraulic pressure acting on the drive belt, the width of the pulley groove is narrowed and the winding diameter of the drive belt is increased. On the secondary pulley side, the movable sheave c and the fixed plunger f are connected to each other in order to prevent the drive belt from slipping by pressing the movable sheave c toward the fixed sheave b even when the hydraulic pressure of the hydraulic chamber g is controlled to discharge the hydraulic pressure. Between them, a coil spring h is contracted.

Here, the movable cylinder e is formed by deep drawing press working into a stepped cylindrical shape that covers the entirety of the fixed plunger f, and the large-diameter portion i in which the fixed plunger f is slidably fitted is: The movable sheave c is fixed in a liquid-tight manner to the outer periphery of a flange portion j provided in a ring shape on the back surface of the movable sheave c.

FIGS. 3 (b) and 4 show a structure in which the large diameter portion i of the movable cylinder e is fixed to the flange j of such a movable sheave c. In FIG. The outer periphery of the flange portion j having a large diameter portion is fitted to the inner periphery of the large-diameter portion i so as to be tightly fitted to the inner periphery of the large-diameter portion i. 6
It is caulked and fixed to the caulking groove k by using a special caulking machine described in 1-1040334.
In addition, in FIG. 4, the movable sheave c and the large-diameter portion i of the movable cylinder e fitted to the outer periphery of the flange portion j are fixed in a liquid-tight state by means such as beam welding. Have been. (62-5
No. 2359)

[0007]

However, FIG.
In the structure in which the large diameter portion i of the movable cylinder e is caulked and fixed to the outer periphery of the flange j of the movable sheave c as shown in FIG. There is a problem that it is necessary to perform caulking on the large-diameter portion i using a caulking machine, which increases the manufacturing cost.

On the other hand, as shown in FIG. 4, in a structure in which a movable sheave c and a large-diameter portion i of a movable cylinder e fitted to the outer periphery of a flange portion j thereof are fixed by means such as beam welding, a thin movable movable c is provided. Since heat treatment distortion is generated in the large diameter portion i of the cylinder e, it is necessary to perform a grinding process for removing the distortion on the inner periphery of the large diameter portion i, which also increases the manufacturing cost.

In the structures shown in FIGS. 3B and 4, the large diameter portion i of the movable cylinder e into which the fixed plunger f is slidably fitted is connected to the flange j of the movable sheave c.
When the cylinder diameter of the movable cylinder e is changed according to the type of the belt-type continuously variable transmission, the outer diameter of the flange j of the movable sheave c also needs to be changed. There is a problem that the sharing of the movable sheave c cannot be achieved and the types of the movable sheave c increase.

Further, in the structure shown in FIGS. 3 (b) and 4, the movable cylinder e, which has a cylindrical shape and covers the entire fixed plunger f, is fixed to the movable sheave c. There is also a problem that internal maintenance of the servo mechanism d is impossible.

Therefore, the first object of the present invention is to provide a support structure for a movable cylinder which can reduce the manufacturing cost as compared with the prior art and can share a movable sheave irrespective of a change in the cylinder diameter of the movable cylinder. Aim. It is a second object of the present invention to provide a configuration that enables internal maintenance of the hydraulic servo mechanism.

[0012]

According to the present invention, as a means for achieving the above-mentioned object, the present invention provides a movable sheave which is fitted to a pulley shaft so as to be able to freely move toward and away from a fixed sheave integral with the pulley shaft, and is fixed to the movable sheave. Belt-type stepless with a hydraulic servo mechanism in which the movable cylinder is slidably fitted with a fixed plunger locked on a pulley shaft to form a hydraulic chamber between the movable cylinder and the fixed plunger. It is characterized in that it is configured as follows for a pulley device of a transmission.

According to a first aspect of the present invention, the movable cylinder includes an annular disk portion in contact with the rear surface of the movable sheave, and a large-diameter cylinder in which a fixed plunger is slidably fitted continuously to the outer periphery of the annular disk portion. And a fitting portion located on the inner peripheral side of the annular disk portion and press-fitted into the hub of the movable sheave. The fitting portion is pressed into the hub of the movable sheave, and the annular disk portion is moved to the movable sheave. The movable cylinder is fixed to the movable sheave while being in contact with the rear surface of the movable cylinder. In such a configuration of the first invention, the movable cylinder comes into contact with and is supported by the movable sheave by the fitting portion and the annular disk portion.
There is no need for caulking using a special caulking machine, and the grinding process only requires a small-diameter hub outer circumference.This can reduce the manufacturing cost to a greater extent than before, and when changing the cylinder diameter of the movable cylinder. However, since it is not necessary to change the design of the movable sheave, it is possible to share the movable sheave.

According to a second aspect of the present invention, as a second aspect, the fitting portion of the movable cylinder press-fitted into the hub of the movable sheave is formed at a position where the rotational axis of the movable sheave and the inner diameter of the cylinder of the movable cylinder are concentrically arranged. It is characterized by doing.
According to the configuration of the second aspect, the movable cylinder can accurately integrate rotation with the movable sheave.

According to a third aspect of the present invention, the fitting portion is formed as a cylindrical fitting portion to be press-fitted into a hub of a movable sheave. According to the configuration of the third aspect, the rotational axis of the movable sheave and the cylinder inner diameter of the movable cylinder are concentrically press-fitted and fixed by the cylindrical fitting portion when the movable cylinder is mounted and fixed. The rotation can be more accurately integrated with the movable sheave.

According to a fourth aspect of the present invention, as the fourth aspect, the fitting portion is formed in a cylindrical fitting portion to be press-fitted into a hub of the movable sheave, and a tip of the tubular portion of the fitting portion is provided in a hub of the movable sheave. It is protruded in the axial direction of the pulley from the step portion, and also serves as a seat surrounding the outer periphery of the end of the coil spring disposed between the hub step portion of the movable sheave and the spring seat of the fixed plunger. . According to the fourth aspect of the invention, in the hydraulic servo mechanism in which the coil spring is disposed between the hub step of the movable sheave and the spring seat of the fixed plunger, it is possible to prevent the spring from expanding outward by centrifugal force. This can be prevented by also using the cylinder fixing means.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 shows a first embodiment of the present invention. A pulley device 1 for a belt-type continuously variable transmission according to the first embodiment includes a fixed sheave 3 integrated with a pulley shaft 2 and an axial direction with respect to the pulley shaft 2. The movable sheave 4 fitted slidably only forms a pulley with a variable groove width around which the drive belt A is wound.

Here, the movable sheave 4 is replaced with the fixed sheave 3
A movable cylinder 6 fixed to the back surface of the movable sheave 4 on the side opposite to the pulley surface and a fixed plunger 7 locked to the pulley shaft 2 are slidably movable as a hydraulic servo mechanism 5 that is driven toward and away from the movable sheave 4. A hydraulic chamber 8 is formed between the opposed shelves so that the hydraulic chamber 8 communicates with an oil passage 2a in the pulley shaft 2 through an oil port 4b formed in a small diameter portion 4a of the hub of the movable sheave 4. doing.

The movable cylinder 6 has an annular disk portion 6b abutting on the back surface of the movable sheave 4, and an annular disk portion 6b
A large-diameter portion 6c of the fixed plunger 7 slidably fitted to the large-diameter portion 7a of the fixed plunger 7;
b, a press-formed product having a fitting portion 6a press-fitted into the hub large-diameter portion 4c of the movable sheave 4 located on the inner peripheral side of the movable sheave 4,
In the case of the present embodiment, the fitting portion 6a is formed as a cylindrical fitting portion, and the hub small diameter portion 4a of the movable sheave 4 is
A spring seat 6d surrounding the outer periphery of the one end of the coil spring 9 is cut out.

The fixed plunger 7 has a large-diameter portion 7a fitted on the inner periphery of the large-diameter portion 6c of the movable cylinder 6 via a seal ring 10, and a ring-shaped stopper member 11 having a flange.
Is formed into a stepped cylindrical shape having a small-diameter portion 7b locked to the pulley shaft 2 through a spring and a spring seat 7c. The spring seat 7c and the hub small-diameter of the movable sheave 4 are formed. The coil spring 9 is contracted between the portion 4a and the step 4d of the hub large diameter portion 4c.

On the outer periphery of the fixed plunger 7, a cover member 13 which surrounds the outer periphery of the plunger and forms a hydraulic balance chamber 12 with the fixed plunger 7 is provided.
The cover member 13 is provided with the large diameter portion 6 of the movable cylinder 6.
c Fitting support portion 13 detachably fitted to the outer periphery in a liquid-tight state
a and a narrowed portion 13b which is loosely fitted on the outer periphery of the boss portion 14a of the transmission gear 14 spline-fitted to the pulley shaft 2 and is pressed into a stepped cylindrical shape substantially along the outer periphery of the fixed plunger 7. Yes, the base end 13c on the side of the fitting support 13a
Is formed in a brim-like shape. And this base end 13
c is a ring-shaped projection 4e protruding from the outer surface of the movable sheave 4.
Is detachably attached to the inner periphery of the device through an appropriate stopper 15 such as a C-ring.

Thus, the fixed plunger 7 and the cover member 1
3 between the stopper member 11 and the end face of the boss portion 14a of the transmission gear 14, and the gap between the spline fitting portion of the transmission gear 14, In communication with another oil passage 2b.

In the pulley device 1 of the belt-type continuously variable transmission according to the first embodiment of the present invention thus configured, when the pressure in the hydraulic chamber 8 of the hydraulic servo mechanism 5 increases, the movable cylinder 6 responds accordingly. Is pressed to the movable sheave 4 side, the movable sheave 4 moves closer to the fixed sheave 3 side, and the winding diameter of the drive belt A increases. Conversely, when the pressure in the hydraulic chamber 8 decreases, the movable sheave 4 moves away from the fixed sheave 3 against the urging force of the coil spring 9 due to the biting force of the drive belt A, so that the drive belt A The winding diameter decreases.

Here, while the pulley shaft 2 is rotating, centrifugal oil pressure is generated in the hydraulic chamber 8 in accordance with the number of rotations. The centrifugal oil pressure in the hydraulic chamber 8 is the centrifugal oil pressure generated in the hydraulic balance chamber 12. Therefore, the hydraulic servo mechanism 5 can perform the desired function regardless of the rotation speed of the pulley shaft 2. While the pulley shaft 2 is rotating, a centrifugal force also acts on the coil spring 9 so as to expand the diameter of the coil spring 9. One end of the coil spring 9 supported on the step 4 d of the movable sheave 4 Is surrounded by the spring seat 6 d of the movable cylinder 6, so that one end of the coil spring 9 does not shift from the step 4 d of the movable sheave 4.

On the other hand, in the pulley device 1 of the belt-type continuously variable transmission according to the first embodiment, in the manufacturing process, the fitting portion of the movable cylinder 6 is fitted to the hub large-diameter portion 4c of the movable sheave 4 which has been subjected to grinding. Since the movable cylinder 6 is mounted and fixed on the rear surface of the movable sheave 4 simply by press-fitting the 6a, a conventional caulking machine using a special caulking machine is not required at all, and the grinding process is performed with a small-diameter hub. Only the outer periphery of the large diameter portion 4c is required, and the manufacturing cost is reduced as compared with the conventional case.

The movable sheave 4 has a structure in which the fitting portion 6a of the movable cylinder 6 is fitted and fixed to the hub large diameter portion 4c, and is not affected by the diameter of the large diameter portion 6c of the movable cylinder 6. Even when the cylinder diameter of the movable cylinder 6 (the inner diameter of the large diameter portion 6c) is changed according to the type of the belt type continuously variable transmission, the design change of the movable sheave 4 is basically unnecessary, and the belt type continuously variable transmission is not required. The movable sheave 4 can be shared regardless of the type of the transmission.

Further, in the pulley device 1 of the belt-type continuously variable transmission according to the first embodiment, the mounting structure of the cover member 13 forming the hydraulic balance chamber 12 between the pulley device 1 and the fixed plunger 7 is as follows.
The cover member 13 has a structure in which the outer periphery of the large diameter portion 6c of the movable cylinder 6 is detachably fitted and the base end portion 13c is engaged with the inner periphery of the ring-shaped projection 4e of the movable sheave 4 by the stopper 15. By properly removing the fixed plunger 7
Are releasably exposed to the movable cylinder 6. Therefore, internal maintenance of the hydraulic servo mechanism 5 becomes possible.

FIG. 2 shows a pulley device 20 of a belt-type continuously variable transmission according to a second embodiment of the present invention. The pulley device 20 of the belt type continuously variable transmission is a cover member 1 of the pulley device 1 of the belt type continuously variable transmission according to the first embodiment.
Since only 3 and the structural parts related thereto are changed, the other structural parts are given the same reference numerals as in the first embodiment, and detailed description thereof will be omitted.

Here, the cover member 21 forming the hydraulic balance chamber 12 partitioned from the hydraulic chamber 8 between the fixed plunger 7 and the transmission gear 1 spline-fitted to the pulley shaft 2.
4 has a narrowed portion 21a that fits loosely on the outer periphery of the boss portion 14a and is pressed into a stepped cylindrical shape substantially along the outer periphery of the fixed plunger 7. It is bent in a brim shape in the direction. The base end 21b is detachably attached to the inner periphery of a mounting portion formed by enlarging the end of the large diameter portion 6c of the movable cylinder 6 via a stopper 15 such as a C-ring as appropriate. I have.

The pulley device 20 of the belt-type continuously variable transmission according to the second embodiment having the above-described structure also has a structure in which the cover member 21 can be freely attached and detached. Since the hydraulic servo mechanism 5 is exposed to be disassembled, internal maintenance of the hydraulic servo mechanism 5 is possible. Other structural parts are the same as those of the pulley device 1 of the belt-type continuously variable transmission, so that the same operational effects as those of the first embodiment can be obtained.

[0031]

As described above, according to the present invention, the movable cylinder 6 has the annular disk portion 6b abutting on the back surface of the movable sheave 4, and the pulley continuously connected to the outer periphery of the annular disk portion 6b. It has a large-diameter cylinder portion 6c arranged in the axial direction, and a fitting portion 6a located on the inner peripheral side of the annular disk portion 6b and pressed into the hub of the movable sheave 4, and the fitting portion 6a is movable. Sheave 4
And the movable cylinder 6 is fixed to the movable sheave 4 in a state where the annular disk portion 6b is in contact with the rear surface of the movable sheave 4. No caulking such as using a caulking machine is required, and the grinding process can be performed only on the outer periphery of a small-diameter hub.

Since the movable cylinder 6 has a structure in which the fitting portion 6a is press-fitted and fixed to the hub of the movable sheave 4, when the cylinder diameter of the movable cylinder 6 is changed according to the type of the belt-type continuously variable transmission. In addition, the design change of the movable sheave 4 is not required, and the movable sheave 4 can be shared.

According to the second aspect of the present invention, the movable cylinder fitting portion 6a to be press-fitted into the hub of the movable sheave 4 is
Since the rotation axis of the movable sheave 4 and the inner diameter of the cylinder of the movable cylinder 6 are formed concentrically, the movable cylinder 6 can accurately integrate rotation with the movable sheave 4. it can.

According to the third aspect of the present invention, since the fitting portion 6a is formed as a cylindrical fitting portion which is press-fitted into the hub of the movable sheave 4, the fitting portion 6a is At the time of press fitting into the hub, the rotational axis of the movable sheave 4 and the inner diameter of the cylinder of the movable cylinder 6 are press-fitted and fixed concentrically. As a result, the movable cylinder 6 rotates more accurately with respect to the movable sheave 4. Can be integrated.

Further, according to the fourth aspect of the present invention, the fitting portion 6a is formed in a cylindrical fitting portion and the fitting portion 6a
Of the coil spring 9 protrudes in the axial direction of the pulley from the hub step of the movable sheave 4 and is disposed between the hub step of the movable sheave and the spring seat 7c of the fixed plunger 7. Since the encircling spring seat 6d is also used, in the hydraulic servo mechanism in which the coil spring 9 is disposed between the hub step of the movable sheave 4 and the spring seat 7c of the fixed plunger 7, the spring is moved by centrifugal force. An effect is obtained that expansion in the direction can be prevented by also using the fixing means (fitting portion 6a) of the movable cylinder 6.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a pulley device of a belt-type continuously variable transmission according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a pulley device of a belt-type continuously variable transmission according to a second embodiment of the present invention.

3A is a longitudinal sectional view showing a conventional example of a pulley device of a belt-type continuously variable transmission, and FIG. 3B is a partially enlarged sectional view thereof.

FIG. 4 is a partially enlarged cross-sectional view corresponding to FIG. 3B in another conventional example of a pulley device of a belt-type continuously variable transmission.

[Explanation of symbols]

 Reference Signs List 1 Pulley device of belt-type continuously variable transmission 2 Pulley shaft 2a, 2b Oil passage 3 Fixed sheave 4 Movable sheave 4a Hub small diameter portion 4b Oil port 4c Hub large diameter portion 4d Step portion 4e Ring-shaped protrusion 5 Hydraulic servo mechanism 6 Movable cylinder 6a Fitting part 6b Annular disk part 6c Large diameter part 6d Spring seat 7 Fixed plunger 7a Large diameter part 7b Small diameter part 7c Spring seat 8 Hydraulic chamber 9 Coil spring 10 Seal ring 11 Stopper member 12 Hydraulic balance chamber 13 Cover member 13a Fitting support portion 13b Restricted portion 13c Base end portion 14 Transmission gear 14a Boss portion 15 Stopper 20 Pulley device for belt-type continuously variable transmission 21 Cover member 21a Restricted portion 21b Base end portion

Claims (4)

[Claims] A movable sheave is fitted to a pulley shaft so as to be able to freely move toward and away from a fixed sheave integrated with the pulley shaft, and a movable cylinder fixed to the movable sheave slides with a fixed plunger locked to the pulley shaft. In a pulley device of a belt-type continuously variable transmission provided with a hydraulic servo mechanism having a structure in which a hydraulic chamber is formed between a movable cylinder and a fixed plunger by movably fitting, the movable cylinder is provided on a back surface of a movable sheave. An annular disk portion that abuts, a large-diameter cylinder portion in which a fixed plunger is slidably fitted continuously to the outer periphery of the annular disk portion, and a hub of a movable sheave located on the inner peripheral side of the annular disk portion The movable cylinder is fixed to the movable sheave in a state in which the engagement portion is pressed into the hub of the movable sheave, and the annular disk portion is in contact with the rear surface of the movable sheave. Belt type continuously variable transmission Of the pulley apparatus. 2. The belt-type continuously variable belt according to claim 1, wherein the fitting portion is formed at a position where the rotation axis of the movable sheave and the inner diameter of the cylinder of the movable cylinder are concentrically arranged. Transmission pulley device. 3. A pulley device for a belt-type continuously variable transmission according to claim 1, wherein said fitting portion is formed as a cylindrical fitting portion which is press-fitted into a hub of a movable sheave. . 4. The fitting portion is formed as a cylindrical fitting portion to be press-fitted into a hub of a movable sheave, and a tip of the cylindrical portion of the fitting portion projects in a pulley axial direction from a hub step portion of the movable sheave. And a seat surrounding the outer periphery of an end of the coil spring disposed between the hub step of the movable sheave and the spring seat of the fixed plunger.
A pulley device for the belt-type continuously variable transmission according to any one of the preceding claims.