JPH058358Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a drive belt for a belt-type continuously variable transmission, and more specifically, to prevent element wear and damage to an endless metal band due to misalignment between both pulleys around which the drive belt is wound. .

[Conventional technology]

In general, a belt-type continuously variable transmission has a drive belt 3 consisting of an endless metal band 1 and elements 2 each made of a large number of metal blocks arranged in the circumferential direction of the metal band 1, as shown in FIG. It is arranged between a driving pulley 4 whose distance between a pair of conical discs can be controlled relatively, and a driven pulley 5 to transmit torque. The drive pulley 4 has a fixed sheave 4a and a movable sheave 4b, each of which is a pair of conical disks with conical surfaces facing each other in the axial direction.The fixed sheave 4a is connected to the drive shaft 6. integrally fixed,
The movable sheave 4b is slidably held on the drive shaft 6. The driven pulley 5 has a fixed sheave 5a.
and a movable sheave 5b, and a fixed sheave 5.
a is integrally fixed to the driven shaft 7, and the movable sheave 5b is slidably held on the driven shaft 7. Then, by keeping the distance L between the axes of both the pulleys 4 and 5 constant and sliding the movable sheaves 4b and 5b in the axial direction opposite to each other by hydraulic control or the like, the V-groove widths D ₁ and D are adjusted. ₂ can be changed steplessly. However, in the conventional belt-type continuously variable transmission, a misalignment Δx occurs at the center of the V groove between the pulleys 4 and 5, and the element 2 of the drive belt 3 in the operating state At the part where it enters, it tries to follow the V-groove shape of the pulley and rotates around the dimple 2a of the element 2 and is suddenly twisted, and on the side that does not transmit torque, the element 2 tries to absorb the misalignment Δx of the center of the V-groove. are shifted from each other or tilted by the clearance between the elements. Therefore, as shown in FIGS. 4 and 5, the metal band 1 is likely to come into contact with the edge portion of the pillar portion 2b of the element 2 and be damaged, or the pillar portion 2b of the element 2 may be damaged due to abnormal wear. There were problems such as. Therefore, in order to solve the above-mentioned problems, it has been proposed, for example, as shown in Japanese Utility Model Application Publication No. 59-66049, that a separately molded protection member is attached to the pillar portion of each element.

[Problem that the invention attempts to solve]

However, such a method has problems such as an increase in the number of parts due to the protection member, and an increase in the number of assembly steps for attaching the protection member to the pillar portion of each element, resulting in high costs. The present invention was made in view of the above-mentioned circumstances, and includes a V
A belt-type stepless belt that is crowned with a curved line of a predetermined radius to absorb misalignment at the center of the groove, reducing the surface pressure when the metal band comes into contact and preventing damage to the metal band. It provides a drive belt for a transmission.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a drive belt composed of an element consisting of an endless metal band and a large number of metal blocks arranged in the circumferential direction of the metal band, on both sides of the pillars of the element. is formed by two curves with predetermined radii centered on the front and rear shoulder ends of the element, and chamfers are made with arbitrary radii at the intersections of the two curves and the intersections of the above curves before and after the pillar. It is structured so that it can be used.

[Effect]

Based on the above configuration, the drive belt of the belt-type continuously variable transmission according to the present invention is chamfered with a curved line having a predetermined radius on both sides of the pillar of the element constituting the drive belt, so that the edge portion of the pillar As a result, the center of the V-groove of both pulleys is misaligned, and the element rotates or the entire belt is twisted, so that even when the endless metal band comes into contact with the pillar, galling does not occur, and the metal band will not be damaged.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a front view of an element showing an embodiment according to the present invention, and FIG. 2 is an enlarged view showing a cross section taken along the line -- in FIG. In the drawings, the same parts and parts corresponding to the conventional example are given the same reference numerals, and the description thereof will be omitted. The pillar 2b of the element 2 constituting the drive belt 3 has a center P ₀ at the intersection of the front part A and the rear part B with the end faces C and D on both sides of the shoulder 2c, and a center P ₁ at the intersection with the side end face of the pillar 2b. , P ₂ , the above _{0 1} and _{0 2} are respectively chamfered with a curve having a radius R, and the intersection point P ₃ of the double-sided chamfered part with the above radius R, and the radius R and the front part A and the rear part B of the element 2. The intersection points P ₄ and P ₅ are chamfered with arbitrary radii r ₁ and r ₂ . Therefore, even if the metal band 1 comes into contact with the side surface of the pillar 2b of the element 2 due to the misalignment of the V-groove center, the metal band 1 will not be damaged by galling or the like.

[Effect of the idea]

As explained above in detail, the drive belt of the belt-type continuously variable transmission according to the present invention has protective members on both sides of the pillar of the element made of metal blocks arranged in the circumferential direction of the metal band, as in the conventional example. Unlike the ones that are installed, it is chamfered at a predetermined radius, so even if the end face of the metal strip comes into contact with the pillar of the above element, the surface pressure on the metal strip will be low and damage to the metal strip will be prevented. , the lifespan can be extended.

[Brief explanation of the drawing]

Fig. 1 is a front view of an element showing an embodiment according to the present invention, Fig. 2 is an enlarged view showing the - cross section of Fig. 1, and Fig. 3 is a partially cutaway configuration diagram showing the main parts of the continuously variable transmission. , FIG. 4 is a front view showing a conventional element, and FIG. 5 is a cross-sectional view taken from FIG. 4 showing a driving state when misalignment occurs due to chamfering. 1...metal band, 2...element, 2b...pillar, 2c...shoulder, R...radius of chamfer.

Claims (1)

[Claims for Utility Model Registration] (1) In a drive belt constituted by an element consisting of an endless metal band and a large number of metal blocks arranged in the circumferential direction of the metal band, both sides of the pillars of the element are , is formed by two curves with predetermined radii centered on the front and rear shoulder ends of the element, and chamfers are applied to arbitrary radii at the intersections of the two curves and the intersections of the above curves before and after the pillar. A drive belt for a belt-type continuously variable transmission that is characterized by the following characteristics: (2) A predetermined radius centered on the shoulder end,
The belt type continuously variable transmission according to claim 1, wherein the side surface of the pillar is located outward from the center, and the length is the length between the side surface of the pillar and the end of the shoulder. drive belt.