JP2001241524A - Changeable diameter pulley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a changeable diameter pulley to prevent loss of transformability of disc springs and abnormal wear due to lack of lubricant on the contact surfaces of disc springs over a long period. SOLUTION: The lubricant pools 43 are formed as a recess in the contact surface of each disc spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a variable diameter pulley in which a power transmission ring is eccentrically sandwiched between a pair of sheaves.

[0002]

2. Description of the Related Art Conventionally, as a variable-diameter pulley capable of changing the effective diameter (contact diameter) of a belt wound around a pulley, for example, a tapered power transmission surface 101 is formed as shown in FIG. A pair of sheaves 100 are provided so as to be relatively movable in the axial direction with their power transmission surfaces 101 facing each other, and a power transmission ring 102 around which a belt B is wound around an outer peripheral surface is attached to the pair of power transmission surfaces. 10
1 and a plurality of disc springs 10 which are held eccentrically with respect to the axis of
One sheave 100 by the urging member 104 comprising
Is provided to the other sheave 100 side. According to this variable-diameter pulley, torque can be transmitted between the power transmission surface 101 of the sheave 100 and the raceway surface 105 of the power transmission ring 102, and, for example, between the pair of sheaves 100 in accordance with the belt tension. The power transmission speed can be changed by eccentricity of the power transmission ring 102 while changing the distance between the power transmission rings.

[0003]

In the conventional variable diameter pulley, each time the interval between the pair of sheaves 100 changes, a plurality of disc springs 103 constituting the urging member 104 are provided.
A friction such as grease is applied to the contact surfaces to prevent deformation of the disc springs 103 due to frictional resistance and wear of the disc springs 103. ing. However, since the lubricant is scattered by centrifugal force or consumed by long-term use, the disc spring 103 is hardly deformed and the belt tension is increased, or the disc spring 103 is abnormally worn. There was a problem. The present invention has been made in view of the above-described problems, and it has been proposed that, due to poor lubrication of the contact surfaces between the disc springs, the disc springs are hardly deformed or abnormally worn for a long period of time. It is an object of the present invention to provide a variable-diameter pulley that can be prevented over the entire area.

[0004]

A variable diameter pulley according to the present invention for achieving the above object is provided so as to be relatively movable in the axial direction with the power transmission surfaces formed on the side surfaces facing each other. A pair of sheaves, a power transmission ring sandwiched eccentrically with respect to the axis of both sheaves by the power transmission surface, a power transmission ring around which a belt is wound around the outer peripheral surface, and a plurality of disc springs are superposed, and at least one And a biasing member for biasing the sheave to the other sheave side, wherein a lubricant storage portion is formed in correspondence with a contact surface of each disc spring of the biasing member. It is characterized by. According to the variable diameter pulley having such a configuration, by filling the storage portion of the disc spring with the lubricant, the contact surfaces of the disc springs can be lubricated well over a long period of time.

[0005]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG.
1 is a sectional view showing a variable diameter pulley according to an embodiment of the present invention. The variable diameter pulley is used as a driven pulley for driving accessories such as an alternator provided in an automobile engine, for example, and is concentrically opposed to a rotating shaft S as a driven shaft. A belt (V-rib belt) B is wound around the first sheave 1 and the second sheave 2 provided in a state and an outer peripheral surface, and a power transmission ring 3 held between the pair of sheaves 1 and 2.
The main part is constituted by a pair of urging members 4 for urging the sheaves 1 and 2 in a direction approaching each other, and a spring retainer 5 for receiving each urging member 4.

The first sheave 1 has a circular annular main body 11.
A cylindrical boss 12 on the inner peripheral side and an annular rim 13 on the outer peripheral side.
Are formed respectively. The boss 12 extends to the back surface of the second sheave 2 in parallel with the axis of the rotation axis S, and the rim 13 projects outside the main body 11. A tapered power transmission surface 1a as a torque transmission surface is formed on a side surface of the main body 11 facing the second sheave 2, and one side surface of the power transmission ring 3 is formed on the power transmission surface 1a. In contact. The boss 12 is axially slidably fitted to a sleeve 51 of the spring retainer 5 via a bush 14 as a slide bearing.
Further, the rim 13 is provided with a plurality of recesses 15 which are fitted on the outer peripheral side of one of the urging members 4 at equal circumferential intervals (see FIG. 2).

The second sheave 2 has a substantially symmetrical shape with respect to the first sheave 1, and has a cylindrical boss 22 on the inner peripheral side of a circular annular main body 21 and an annular rim 23 on the outer peripheral side. Each is formed. The boss 22 extends parallel to the axis of the rotation shaft S, and the rim 23 projects outside the main body 21. A tapered power transmission surface 2 a as a torque transmission surface is formed on a side surface of the main body portion 21 facing the first sheave 1. The power transmission surface 2a has a tapered surface opposite to the power transmission surface 1a of the first sheave 1 so as to form a V-shaped annular space with the power transmission surface 1a of the first sheave 1. The other side surface of the power transmission ring 3 is in contact with the power transmission surface 2a. The boss 22 is axially slidably fitted to the boss 12 of the first sheave 1 via a bush 24 as a slide bearing. Further, the rim 23 is provided with a plurality of concave portions 25 which are fitted on the outer peripheral side of the other urging member 4 at equal circumferential intervals (see FIG. 2).

The power transmission ring 3 is entirely made of a synthetic resin, and has a track formed on both side surfaces thereof with tapered surfaces parallel to the power transmission surfaces 1a and 2a of the first and second sheaves 1 and 2. A surface 31 is formed. A plurality of V-shaped grooves 32 for introducing ribs on the inner peripheral surface of the belt B are formed in a portion of the power transmission ring 3 around which the belt B is wound. As a material of the power transmission ring 3, for example, a material in which phenol resin is mixed with carbon fiber, aromatic polyamide fiber, and graphite is excellent in strength and wear resistance, and has low aggression to the power transmission surfaces 1a and 2a. This is preferred.

The urging member 4 includes three disc springs 40 in the case shown in FIG.
As shown in FIGS. 4 and 5, each of the disc springs 40 has a plurality of convex portions 41 that match the concave portions 15 and 25 of each of the sheaves 1 and 2 at equal positions on the outer periphery. A plurality of slits 42 are formed radially from the inner periphery to the middle. Each of the disc springs 40 is elastically deformed by a predetermined amount in a state where the convex portion 41 is fitted in the concave portions 15 and 25 of the sheaves 1 and 2 and the slit 42 is fitted in a convex portion 53 of the spring retainer 5 which will be described later. In this state, the sheaves 1 and 2 are interposed between the respective sheaves 1 and 2 and the spring retainer 5, whereby the respective sheaves 1 and 2 are pressed and urged in a direction approaching each other.

As shown in FIGS. 3 and 4, each of the disc springs 40 has a lubricant storage portion 43 corresponding to its contact surface. Lubricant such as grease is filled. The storage portion 43 of the lubricant is formed by pressing and deforming the contact surface of the disc spring 40 into a concave shape by a press or the like before quenching the disc spring 40. It is provided in the place. In the case of the drawing, each storage portion 4 of the adjacent disc spring 40
3 are facing each other. Note that the same lubricant as the lubricant filled in the storage section 43 is applied to the entire contact surface of each disc spring 40.

The spring retainer 5 comprises a sleeve 51 in which the first sheave 1 is fitted, and a pair of disk-like retaining plates 52 provided at both ends of the sleeve 51, respectively. The plate 52 is disposed on the back side of each of the sheaves 1 and 2. One holding plate 52 is formed integrally with the sleeve 51, and the other holding plate 52 is bolted to an end of the sleeve 51. further,
On the outer peripheral side of the pressing plate 52, convex portions 53 for fitting the slits 42 of the disc springs 40 are provided on the circumference at equal intervals. The sleeve 51 is provided with a rotating shaft S
The shaft 54 is integrally rotatably fitted to the rotating shaft S using a key 54 so that torque can be transmitted to the rotating shaft S.

The variable diameter pulley can transmit the driving force of the belt B to the rotating shaft S via the power transmission ring 3, the sheaves 1 and 2, the urging member 4, and the spring retainer 5. At this time, the rotation speed of the rotation shaft S can be automatically adjusted according to the tension of the belt B. For example, when the tension of the belt B is increased by a tension adjusting mechanism (not shown),
The power transmission ring 3 is eccentric with respect to the sheaves 1 and 2 while separating the sheaves 1 and 2 from each other against the urging force of the urging member 4 (see FIG. 6). As a result, the effective diameter of the belt B wound around the power transmission ring 3 decreases, and the speed increase ratio increases. When the tension of the belt B falls below a predetermined value from this state, the sheaves 1 and 2 approach each other due to the urging force of the urging member 4, and finally the power transmission ring 3 moves with respect to the respective sheaves 1 and 2. It becomes concentric (see FIG. 1). As a result, the effective diameter of the belt B wound around the power transmission ring 3 increases, and the speed increase ratio decreases.

The variable-diameter pulley having the above-described configuration
Since the lubricant is filled in the storage portion 43 provided in the zero, the lubricant can be sufficiently supplied to the contact surfaces of the respective disc springs 40 for a long period of time. Therefore, due to the frictional resistance between the contact surfaces of the respective disc springs 40, the corresponding disc springs 4
0 can be prevented from being easily deformed or abnormally worn over a long period of time.

The lubricant reservoir 43 formed in the disc spring 40 at the center may be constituted by a through hole as shown in FIG. In addition, the storage part 43 of the lubricant,
It may be provided on only one of the adjacent disc springs 40.
The variable-diameter pulley of the present invention is not limited to the above-described embodiment. For example, the number of components of the disc spring 40 of each urging member 4 may be increased or decreased, and only one of the sheaves 1 and 2 may be attached. Various design changes such as biasing by the biasing member 4 can be performed.

[0015]

As described above, according to the deformable pulley of the present invention, since the lubricant can be stored in the storage portion of each disc spring, the contact surface between each disc spring can be maintained for a long time. As a result, the frictional resistance of the contact surface between the disc springs makes it difficult for the disc springs to be deformed and increases the belt tension and causes the disc springs to wear abnormally. It can be prevented over a period of time.

[Brief description of the drawings]

FIG. 1 is a sectional view of a variable diameter pulley according to an embodiment of the present invention.

FIG. 2 is a side view of a sheave.

FIG. 3 is an enlarged sectional view of a main part of an urging member.

FIG. 4 is a side view of the disc spring.

FIG. 5 is a sectional view of a disc spring.

FIG. 6 is a cross-sectional view of the variable diameter pulley showing a state where the power transmission ring is eccentric.

FIG. 7 is an enlarged sectional view of a main part showing another embodiment of a lubricant storage section.

FIG. 8 is a sectional view showing a conventional variable diameter pulley.

[Description of Signs] 1 Sheave 1a Power transmission surface 2 Sheave 2a Power transmission surface 3 Power transmission ring 31 Track surface 4 Urging member 40 Disc spring 43 Lubricant storage portion B Belt S Rotary shaft

Claims (1)

[Claims] 1. A pair of sheaves provided so as to be relatively movable in an axial direction in a state where power transmission surfaces formed on side surfaces are opposed to each other, and eccentric with respect to the axis of both sheaves by the power transmission surfaces. A power transmission ring that is pinched so as to allow a belt to be wound around the outer peripheral surface, and a biasing member that is formed by stacking a plurality of disc springs and biases at least one sheave toward the other sheave. In the pulley, corresponding to the contact surface of each disc spring of the urging member,
A variable diameter pulley which forms a reservoir for lubricant.