JPS61140643A - Block type v-belt - Google Patents

Abstract

PURPOSE:To secure a high accuracy of dimension, by integrally forming block core members with side members, and then inserting belt members from both sides of the side members to carry out assembling of the belt members. CONSTITUTION:Side members 15 and 16 are made of an elastic material, and are integrally formed with block core members 7 in such a manner as to sur round bent portions 12 and 13 and a part of engagement portions 9 and 10 of the block core members 7. Both side surfaces of the side members 15 and 16 are inclined in a V-shaped manner. Belt members 1 are inserted into grooves 8 of the block core members 7 fixed to the side members 15 and 16 in such a manner that a tooth groove 4 and a tooth 5 are engaged with the engagement portions 9 and 10, respectively. Accordingly, it is possible to preliminarily set an angle and distance of frictional driving surfaces formed on both sides of the side members with a high accuracy, thereby securing a high accuracy of dimension.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a block-type V-belt used in belt-type continuously variable transmissions, and particularly to a block-type V-belt of a tension transmission type using a band having teeth. be.

Prior art and its problems Conventionally, as a block-type V-belt using a tension transmission method, as described in Japanese Patent Publication No. 59-8697, a block component is integrated with a U-shaped reinforcing member and a side part of this reinforcing member. It is known to be constructed of a molded polymer block, which is attached so as to surround the strip by securing the two block components facing each other and parallel to each other.

In the case of this block-type V-belt, the reinforcing member is a sheet metal, so it has good heat dissipation and high rigidity against lateral pressure, and the friction drive surface is made of a polymer block, so it has good resistance to the pulley surface. It has the advantage of reducing noise caused by contact.

However, since the band must be surrounded by two block components and the block components must be fixed together by welding or gluing, it is difficult to assemble a large number of block components onto the band. The work takes a long time, and once assembled, the block components and the band cannot be disassembled, so if the band is damaged, for example, all parts including the block components must be replaced. However, it is uneconomical. Furthermore, since the two block components must be assembled at the same time as the band, the angle and spacing of the friction drive surfaces on both sides tend to vary when they are assembled, and the pulley surface requires sufficient clearance. Power transmission may not occur.

In addition, in the above V-belt, since the block components surround the belt, there is a gap equal to the thickness of the polymer block between the belt and the pulley surface, and therefore, compared to the total width between the pulleys, there is a gap between the belt and the pulley surface. There is also the problem that the width of the band is restricted.

Purpose of the Invention The present invention has been made in view of such conventional problems.
The purpose of this is to make it easy to assemble and disassemble the strip to the block without sacrificing the advantages of the conventional method, and to easily obtain dimensional accuracy such as the angle and spacing of the friction drive surface. To provide a block-type V-belt that can secure the maximum width of a belt body.

Structure of the Invention In order to achieve the above object, the block-type V-belt of the present invention includes two endless belts each having a tooth row formed on at least one side, and folded into a substantially U-shape with one side open. The opening is used as an insertion groove into which the band is inserted, and an engaging portion that engages with the tooth row is formed on at least one of the upper and lower surfaces of the insertion groove, and the bottom back surface of the insertion groove is formed with a plate thickness. two sheet metal block cores that are fixed in the direction; and a side body made of an elastic material such as rubber that is integrally molded at both ends of the block core except for the insertion groove and has friction drive surfaces on both sides. It is composed of

In other words, it can be assembled by simply inserting the band from the side after the block core is integrated with the side body, making assembly and disassembly easy, and the block core and side body can be assembled easily. Since the fixing work and the assembling work of the band can be performed separately, the angle and spacing of the friction drive surfaces formed on both sides of the side body can be set with high precision in advance, ensuring high dimensional accuracy. can. Furthermore, the width of the two strips is smaller than the total width between the pulleys by the thickness of two block cores, so when the width between the pulleys is limited, the width of the strip can be secured to the maximum extent possible.

In addition, it goes without saying that it still has the conventional advantages such as heat dissipation, high rigidity against lateral pressure, and noise reduction.

DESCRIPTION OF THE EMBODIMENTS The drawings show an example of a block-type V-belt according to the present invention, and the band 1 is reinforced by embedding a plurality of core wires 3 continuous in the longitudinal direction in the center of a rubber base material 2. Concave tooth grooves 4 and convex teeth 5 are formed on the inner surface of the band 1 in the width direction, respectively, and these tooth grooves 4 and teeth 5 form a tooth row.

The block 6 is composed of two block core bodies 7.7 having the same shape, and side bodies 15.16 integrally molded so as to wrap around both ends of these block core bodies 7.7.

F; As shown in FIG. 2, the long core body 7 is formed by pressing a sheet metal and bent into a substantially U-shape with an opening on one side. It forms an insertion groove 8 for inserting from the side. Above insertion groove 8
The upper and lower surfaces thereof have engaging portions 9.10 that engage with the tooth grooves 4 and teeth 5 of the band l, respectively, as shown in FIG. Further, both ends of the block core body 7 excluding the insertion groove 8 have bent portions 12 and 13 bent in the vertical direction.

As shown in FIG. 2, the block core 7.7 is spot welded or riveted with the bottoms 11 of the insertion grooves 8 aligned back to back.

It is fixed by adhesive or other means.

The side bodies 15 and 16 are made of an elastic material such as natural rubber or synthetic rubber, and are integrally molded so as to wrap around a part of the bent part 12.13 and the engaging part 9.10 of the block core body 7. Both sides of the side bodies 15 and 16 are inclined in a figure 7 shape, and these both sides serve as friction drive surfaces 17.18 to which power is transmitted from the pulley surface.This friction drive surface 17.18
As a result, noise caused by contact with the pulley is reduced, high frictional force with the pulley surface is obtained, and power transmission efficiency is improved.

In the band l, the tooth grooves 4 and the teeth 5 are connected to the engaging portion 9 from both sides of the insertion groove 8 of the block cores 7, 7 to which the side bodies 15 and 16 are fixed.
, 10 and is assembled. Therefore, it is extremely easy to assemble and disassemble, and if the band 1 is damaged, it is only necessary to replace the band 1, which is economical.

In addition, the side bodies 15 and 16 are fixed by molding to both ends of the two block cores 7 and 7 after they are fixed back to back as shown in Figure 2, or with the block core 7 alone. Therefore, the angle θ and interval of the friction drive surface 17°18! (4th
(see figure) can be set with high precision according to the angle and pitch width of the pulley surface, and dimensional variations do not occur. Therefore, the friction drive surfaces 17 and 18 of all blocks 6 can be accurately brought into surface contact with the pulley surface. .

Furthermore, the sum of the widths of the two strips 1 can be determined by subtracting two plate thicknesses of the block core 7 from the total width between the pulleys, so the total width between the pulleys is limited. Even in such cases, the maximum width of the band 1 can be ensured. therefore,
It becomes possible to reduce the load per unit area of the band 1, which helps to extend the life of the band 1.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, teeth or tooth grooves may be provided only on one of the inner and outer surfaces of the band body 1. Correspondingly, the engagement of the block core body 7 may be The shape of portions 9 and 10 can also be changed arbitrarily. However, as in the embodiment, the engaging portion 9 is bent into a substantially U-shape on the upper and lower surfaces of the insertion groove 8. It is preferable to form lO because the buckling strength can be improved against lateral pressure from the pulley or compressive load in an oblique direction.

Effects of the Invention As is clear from the above explanation, according to the present invention, the band can be assembled by simply inserting it into the insertion groove of the block core, making assembly and disassembly easy.
Since the work of fixing the block core and side body and the work of assembling the band can be done separately, the angle and spacing of the friction drive surfaces formed on both sides of the side body can be set in advance with high precision. , ensuring high dimensional accuracy.

In addition, the difference between the total width between the pulleys and the width of the two strips is equal to the thickness of two block cores, so the width of the strips can be secured to the maximum, which improves power transmission and the longevity of the strips. Favorable results can be obtained in this respect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a block type V-belt according to the present invention;
Figure 2 is a perspective view of the block core, Figures 3 and 4 are the
They are a cross-sectional view taken along the line ■-■ and a cross-sectional view taken along the line IV-IV in the figure. DESCRIPTION OF SYMBOLS 1... Band body, 4... Tooth groove, 5... Teeth, 7... Block core body, 8... Insertion groove, 9.10... Engagement part,
11... Bottom, 12.13... Bent part, 15.16
...Side body, 17.18...Friction drive surface. Applicant: Daiha N Kogyo Co., Ltd. Agent
Patent attorney Hidetaka Tsutsui

Claims (1)

[Claims] (1) Two endless bands with tooth rows formed on at least one side, bent into a substantially U-shape with an opening on one side, and using the opening as an insertion groove into which the bands are inserted; two sheet metal block cores formed by forming an engaging portion that engages with the tooth row on at least one of the upper and lower surfaces of the insertion groove, and fixing the bottom back surface of the insertion groove in the thickness direction; A block-type V-belt comprising a side body made of an elastic material such as rubber, which is integrally molded at both ends of a block core excluding the insertion groove, and has friction drive surfaces on both sides.