JPH0765640B2 - Belt for continuously variable transmission - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a continuously variable transmission V-belt used in a continuously variable transmission, and more particularly to a device for reducing a compliance characteristic of an element. In general, a V-belt of this type is formed by stacking a large number of V-shaped elements in an annular arrangement and winding an endless ring so that the elements do not come apart from each other. In principle, the ring simply supports the element without transmitting the power, and is configured to transmit the power by the narrow pressure between the pulley and the element and the pressing force between the elements. Here, the elements are provided with vertical and horizontal positioning means with respect to the belt running direction in order to maintain the aligned state in one row.

[Prior art]

Therefore, conventionally, there is a prior art of Japanese Utility Model Laid-Open No. 58-76844, for example, regarding the mutual positioning of the elements in the V belt. Here, it is shown that convex dimples are provided on one of the front and rear surfaces of the element, and concave holes are provided on the other side, and adjacent elements are positioned with respect to each other by engagement of these dimples and holes.

[Problems to be Solved by the Invention]

Here, each of the elements is manufactured by punching a plate material having a predetermined thickness with a press, and at this time, a convex mold is pressed to form dimples and holes. Therefore, as shown in FIG. 4, in the element 10, the portion 22 around the dimple 15 tends to be mountainous and thicker than the other portions during the above-mentioned press working. Therefore, when a large number of elements 10, 10, ... Are aligned while being overlapped while engaging the dimples 15 and the holes 16 as shown in the drawing, a portion 22 around the thick dimples comes into contact with the outer ear. It will lack 19 contacts. Therefore, assuming the straight part on the tight side of the belt where the elements press each other to transmit torque, the tilt displacement when the force F _{2 is applied} to the left and right under the compression of force F ₁ as shown in the figure The compliance value shown is higher. A large value of such compliance means that when each element moves while pushing, it swings to the left and right and meanders.At this time, the pillar of the element comes into contact with the ring end surface and scratches it, resulting in durability of the ring. Spoil. In addition, there is a problem that vibration of the belt and noise increase. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a belt for a continuously variable transmission, which prevents contact between middle heights around the dimples of the element and reduces the compliance value. I am trying.

[Means for solving problems]

In order to achieve the above object, the present invention provides a dimple in one of the heads substantially at the center of the head of the element and a hole in the other of the heads, and the elements are positioned by the engagement of the dimple and the hole. The peripheral portion is processed so as to have a smaller thickness than other portions, and the left and right ears of the dimple and the shoulder portion are configured to press and contact each element.

[Action]

Based on the above configuration, in the head of each element, the right and left ears of the dimple make stable two-point contact, and it is difficult for the head to lean left and right. Thus, according to the present invention, it is possible to reduce the compliance value when a large number of elements are pressed, which is advantageous in terms of belt durability, vibration, and the like.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. Referring to FIG. 1, an outline of a continuously variable transmission to which the present invention is applied will be described. Reference numeral 1 is a primary pulley, 2 is a secondary pulley, and a van,
The Donne type V-belt 3 is wrapped around. Here pulley 1,
2 is a variable interval type, for example, a secondary pulley 2
Side always presses the V-belt 3 with a predetermined hydraulic pressure, and the winding state of the V-belt 3 is changed by changing the belt pressing force of the primary pulley 1 in this state. That is, the pulley ratio is changed steplessly by changing the belt winding diameter ratio of both pulleys 1 and 2. The V-belt 3 will be described in detail with reference to FIGS. 2A and 2B. The V-belt 3 includes a plurality of elements 10 and an endless ring 30. The element 10 has a body 12 having a V-shaped side surface 11.
The head 14 is provided through the pillar 13 in
A dimple 15 is provided on the front surface of the center of the head 14 and a hole 16 is provided on the rear surface thereof, and a taper 17 for tilting along the pulley is provided on the front surface of the body 12. Rings 30 are hung on the shoulders 18 of the body 12 on the left and right sides of the body, and the left and right ears 19 of the head 14 prevent the element 10 from being separated from the ring 30. Further, a notch Hillet 20 is formed above and below the pillar 13 to prevent contact with the ring 30, and a notch 21 for equalizing the distribution of the pressing force by the ring 30 is provided at the lower part of the body 12. is there. The ring 30 is formed by stacking a plurality of flexible thin strip-shaped members in order to reduce bending stress generated when the ring 30 is wound around a pulley with a small radius of curvature. Therefore, many elements 10, dimples 15 and holes 16 are provided.
While being engaged with and, they are aligned in series in the belt running direction and are sequentially polymerized to be aligned in an annular shape. Then, a V-belt 3 is configured by hanging a ring 30 between each element 10 and integrating them. Therefore, in FIG. 1, the belt pressing force on the pulleys 1 and 2 acts on each element 10, and the primary pulley 1
Will drive each element 10. Therefore, the torque is transmitted while sequentially pressing each element 10 in the one tight side linear portion 3a of the V belt 3, and the secondary pulley 2 is rotated in the same direction at a predetermined pulley ratio. Therefore, in the element 10 having the above-described structure, as shown in FIG. 3, the peripheral portion 22 of the dimple 15 is cut thinner than other portions in the press working or the subsequent cutting. When the elements 10 are pressed against each other, the left and right ears 19 of the dimple 15 are surely brought into contact with each other. As a result, the head 14 of the element 10 makes stable contact at two points on the left and right ears 19, and the compliance value indicating the left and right tilted state becomes small. Therefore, the meandering at the tension side linear portion 3a of the V belt 3 is reduced.

【The invention's effect】

As described above, according to the present invention, the continuously variable V
In the belt element, the middle height around the dimples is eliminated to reduce the compliance value, so that the meandering of the tight side straight portion of the belt can be effectively reduced. Therefore, contact between the pillar 13 of the belt element and the ring 30 is prevented, and vibration of the belt can be reduced. Furthermore, the positioning becomes good with the engagement of the dimples and the holes.

[Brief description of drawings]

1 is a side sectional view showing a continuously variable transmission to which the present invention is applied, FIGS. 2 (a) and 2 (b) are front views and sectional views of a V-belt, and FIG. 3 is a V-belt of the present invention. Sectional view showing an embodiment,
FIG. 4 is a sectional view showing a conventional example. 3 ... V-belt, 10 ... Element, 14 ... Head, 15
…… Dimples, 16 …… Hall, 19 …… Year, 22 ……
The part around the dimples.

Claims (1)

[Claims] 1. A thickness of a portion around a dimple of the head in a structure in which a dimple is formed in one of the centers of the head of the element and a hole is formed in the other of the elements, and the elements are positioned by engagement of the dimple and the hole. A belt for a continuously variable transmission in which each element is pressed into contact with the left and right ears of the dimple and the shoulder portion by processing so as to be thinner than other parts.