JPH10213185A - V-belt element for continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a V-belt element for a continuously variable transmission facilitating elimination of an oil film formed at contact faces of an element side face and a pulley so as to obtain large frictional force of the contact faces and effectively preventing wear of the element through relaxation of bearing pressure at the time of backward inclined contact of the element. SOLUTION: Both side faces 2a of V-type elements 2 of a V-belt composed of laminated rings 1 formed by laminating a plurality of endless rings, and a large number of V-type elements 2 arranged being connected so as to be able to come in contact with each other in the circumferential direction of the laminated rings 1 are brought into contact with tapered faces 3a, 4a of V-shape pulleys 3, 4 so as to transmit torque by the frictional force. In the V-belt element of a continuously variable transmission of such constitution, the side face of the V-type element 2 is formed in such shape that protuberant parts 2a and groove parts 2e are alternately arranged, and the width of the protuberant parts 2d is so formed that width W2 on the tip side in the proceeding direction of the element is narrow and that width W1 of the rear end side is wide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a continuously variable transmission V.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a V-shaped element used for a belt, and more particularly to an element for a V-belt of a continuously variable transmission capable of improving the efficiency of a V-belt for a continuously variable transmission and preventing a reduction in wear of the V-shaped element. About.

[0002]

2. Description of the Related Art Generally, as a V-belt of a continuously variable transmission, as shown in FIGS.
a to 1n are fitted to each other and stacked in a layered manner, and a plurality of V-shaped elements 2 which are arranged so as to be able to contact each other in the circumferential direction of the stacked ring 1 Have been.

The V-belt of this type of continuously variable transmission is wound around an input pulley 3 connected to an engine or the like and an output pulley 4 connected to an output shaft.
V-shaped side surface 2a of the element 2 and input pulleys 3, 4
The rotational force is transmitted by the contact friction force generated between the conical surfaces 3a and 4a. The input pulleys 3 and 4 are configured so that the V-shaped groove width can be varied. The groove width is appropriately changed by hydraulic pressure or the like, and the friction contact position of the V belt with the input pulleys 3 and 4 is adjusted. , The running radius of the V-belt, that is, the gear ratio, is continuously changed to function as a continuously variable transmission.

On the side surface of the V-shaped element of such a conventional V-belt for a continuously variable transmission, for example, a raised portion 16 and a grooved portion 15 as disclosed in Japanese Patent Application Laid-Open No. 2-236045 are disclosed. (See FIG. 7).

[0005]

However, in such a conventional continuously variable transmission V-belt, a large number of V-belts are required.
Since the torque is transmitted by the pressing force between the V-shaped elements, the pressing force between the V-shaped elements increases, especially as the transmission torque increases, and the V-shaped element is inclined backward accordingly. Because the moment acts,
The contact surface of the V-shaped element side surface with respect to the V-shaped pulley tends to be biased toward the rear end side in the traveling direction of the V-shaped element, and an excessive surface pressure is applied to the raised portion of the V-shaped element side surface, There has been a problem that the abrasion of the raised portion progresses and the V-belt easily slips.

As a method for solving this problem, contrary to the above-mentioned conventional example, it is conceivable to widen the width of the side protrusions of the V-shaped element as a whole and to reduce the width of the groove.
In such a configuration, drainage of the oil film interposed between the raised portion and the surface of the pulley becomes disadvantageous, and the torque transmission efficiency is reduced by the V-belt and the wear of the element is promoted. There was a problem that it would not be a simple solution.

The present invention has been made in view of the above situation, and an object of the present invention is to make the shape of the lateral protrusion of the element in the width direction narrow at the front end side in the element traveling direction and wide at the rear end side. It is an object of the present invention to provide a V-belt element of a continuously variable transmission capable of improving the torque transmission efficiency of the V-belt and improving the durability of the V-belt by adopting such a shape. .

[0008]

In order to achieve the above object, according to the present invention, there is provided a laminated ring formed by laminating a plurality of endless rings, and a mutually contactable circumferential direction of the laminated ring. A torque is transmitted by frictional force by contacting both side surfaces of the above-mentioned element of the V-belt constituted by a number of V-shaped elements arranged in series with the tapered surface of a V-shaped pulley. Assuming that the element for a V-belt of a continuously variable transmission configured as described above is a technical premise, the side surface of the V-shaped element has a shape in which ridges and grooves are alternately arranged, and a width of the ridge. Is characterized in that the front end side in the element traveling direction is narrow and the rear end side is wide.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the accompanying drawings.

FIGS. 1 and 2 show a V-shaped element 2 according to a first embodiment of the present invention, wherein a dimple 2c of the V-shaped element 2 is fitted into a hole 2f. , So that a number of V-shaped elements 2 are aligned. Reference numeral 2g in the figure is called a saddle or a shoulder, and the multilayer ring 1 is in close contact with the saddle 2g.

Further, the side portion 2a of the V-shaped element 2
Has a pattern in which the ridges 2d and the grooves 2e are alternately arranged. Usually, the V-shaped element 2 has the dimple portion 2c side as the tip in the traveling direction. In this embodiment, as shown in FIG. 2, the width of the raised portion 2d becomes narrower toward the tip side in the element traveling direction (w
2) It is formed so as to be wider as the width (w1) on the rear end side.

Of course, also in this embodiment, the V-belt of the continuously variable transmission is wound between an input pulley 3 connected to an engine or the like and an output pulley 4 connected to an output shaft, as in the conventional example. The input pulleys 3 and 4 are configured to transmit rotational force by contact friction generated between the V-shaped side surface 2a of the element 2 and the conical surfaces 3a and 4a of the input pulleys 3 and 4. The input pulleys 3 and 4 are configured so that the V-shaped groove width can be varied. The groove width is appropriately changed by hydraulic pressure or the like, and the friction contact position of the V belt with the input pulleys 3 and 4 is adjusted. , The running radius of the V-belt, that is, the gear ratio, is continuously changed to function as a continuously variable transmission.

Next, the operation of the V-shaped element 2 configured as described above will be described.

Generally, the frictional force caused by sliding contact between metals via an oil film is such that the oil film thickness h1 on the front side in the sliding direction is larger than the oil film thickness h2 on the rear side, and the oil film thickness ratio between the two is m = h2
As / h1 increases, the fluid frictional force increases and the intermetallic frictional force decreases. Accordingly, the width w2 of the protruding portion 2d of the V-shaped element 2 in the advancing direction is narrowed so that the oil film thickness h1 on the front side in the sliding direction can be reduced, and the oil film thickness ratio m is reduced. It is possible to prevent a reduction in frictional force between metals.

On the other hand, a large number of V-shaped elements 2 transmit torque while pressing each other. In particular, at the pulley winding portion (A1 portion in FIG. 5), the V-shaped element 2 is moved in the traveling direction. Since a moment is generated that causes the taper surface 3 of the pulleys 3 and 4 to tilt backward.
The contact surface of the side surface 2a of the V-shaped element 2 with respect to a and 4a comes to strongly hit the rear end side in the traveling direction of the V-shaped element 2. Under such conditions, V
Since the contact is made at the wide portion w1 of the raised portion 2d of the character-shaped element 2, the surface pressure of the raised portion 2d can be reduced, and the wear can be reduced.

FIGS. 3 and 4 show the pattern of the ridges and grooves on the side surface 2a of the V-shaped element 2 according to the second embodiment of the present invention. In this embodiment, the thickness of the side surface 2a of the V-shaped element 2 is thicker on the upper side, but thinner on the lower side because of the shape of the taper.

Therefore, as for the width w of the raised portion 2d, only in the upper side where the thickness of the side surface 2a is thicker, as in the first embodiment, the front end in the traveling direction of the V-shaped element 2 is thin (w2) and the rear end is wide. (W1), and the lower side is configured such that w1 = w2 = w. Since the lower side of the side surface of the V-shaped element 2 is originally thin, the effect of the frictional force by the oil film is small, and the width of the raised portion 2d may be formed uniformly.

[0018]

As described above, according to the V-belt element of the continuously variable transmission according to the present invention, the width of the raised portion on the side surface of the V-shaped element is reduced at the front end side in the element advancing direction and at the rear end side. , The oil film formed on the contact surface between the element side surface and the pulley can be easily removed, the frictional force on the contact surface can be increased, and the surface pressure at the time of backward inclination of the element can be reduced. Therefore, an excellent effect that the wear of the element can be effectively prevented can be obtained.

[Brief description of the drawings]

FIG. 1 shows a V-belt element and a laminated ring of a continuously variable transmission according to a first embodiment of the present invention,
(A) is a front view, (b) is a side view.

FIG. 2 is an enlarged cross-sectional view taken along line AA and a line BB in FIG. 1 (b).

FIG. 3 is a front view of a V-belt element and a laminated ring of a continuously variable transmission according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view taken along line AA and a line BB of FIG. 3;

FIG. 5 is a V for a continuously variable transmission wound around an input / output pulley.
It is a side view of a belt.

FIG. 6 is a top view of the continuously variable transmission V-belt.

FIG. 7 is an explanatory diagram showing a pattern of a side ridge and a groove of a V-shaped element in a conventional continuously variable transmission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multilayer ring 2 V-shaped element 2a Side surface of V-shaped element 2d Raised part 2e Groove part 3,4 Pulley 3a, 4a Tapered surface of pulley w1 Width of rear end side in element traveling direction w2 Width of distal end side in element traveling direction

Claims (1)

[Claims] 1. A laminated ring formed by laminating a plurality of endless rings, and a large number of V-shaped elements arranged so as to be able to contact each other in the circumferential direction of the laminated ring. The V-belt element of a continuously variable transmission, which is configured to transmit torque by frictional force by contacting both side surfaces of the element of the V-belt with a tapered surface of a V-shaped pulley, The side surface of the V-shaped element has a shape in which ridges and grooves are alternately arranged, and the width of the ridge is shaped such that the front end side in the element traveling direction is narrow and the rear end side is wide. V-belt element for a continuously variable transmission.