JPH06109077A - Driving belt - Google Patents

Abstract

PURPOSE:To improve the engagement part between the contiguous steel blocks of a driving belt which is used for a continuously variable transmission and consists of the combination of steel blocks and steel bands and reduce the friction due to the interference between the steel block and steel band. CONSTITUTION:The projection part 15 and the recessed part 16 of a steel block are set in the vicinity of the pitch line of a driving belt 3, and the span (lateral width) is set large, and the sectional surface shape is formed to a semicircular form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive belt which is a combination of a band and a block and which is stretched around a pair of pulleys whose groove width can freely change in the axial direction.

[0002]

2. Description of the Related Art A transmission (C
As shown in FIG. 4, a typical example of (VT) has a basic configuration in which a drive belt 3 is stretched between a drive side pulley 1 and a driven side pulley 2. Both pulleys 1 and 2 allow one of the inclined walls 5 and 5'on both sides forming the grooves 4 and 4'to be slidable by hydraulic pressures 6 and 6 ', so that the widths of the grooves 4 and 4'can be adjusted. To do. That is, when changing the groove width of the pulley on one side, the groove width of the pulleys facing each other is changed at the same time. This is essential for achieving continuously variable transmission under the condition that the drive belt length is constant and the pulley shaft distance is constant.

A drive belt 3 for this type of transmission is shown in FIG.
As shown in FIG. 6, the steel block 7 and the steel band 8 are combined. The steel block 7 has a main body 9 whose both side surfaces are in sliding contact with the opposing inclined walls of the pulley, a pillar 10 extending from the center of the main body 9, and a space 11 extending laterally from the pillar 10 and between the main body 9. Band holding plate 12 for making The endless steel band 8 is arranged in the space 11.

The drive belt 3 makes a linear movement between the pulleys 1 and 2 and a circular movement along the pulleys 1 and 2, or at the time of the linear movement, the band pressing portion 12 of each block 7 vibrates separately. , Reduces the efficiency of torque transmission, and hits the side faces of the pulleys 1 and 2 to damage them. Therefore, a means for connecting the band retainers 12 of each block 7 is adopted. That is, the pin-shaped protrusion 13 is formed on one side surface of the center of the band pressing plate 12.
And a recess 14 for receiving the protrusion of the adjacent block is provided on the opposite side surface. In the block 7, the protrusion 13 is inserted into the recess 14 and superposed.

However, the drive belt 3 having the protrusions 13 and the recesses 14 swings during linear movement. The swing of the drive belt causes the block 7 to swing around the protrusion 13. The swing motion of block 7 is steel band 1
Greater friction with 2, steel band 12 and block 7
And cause wear and tear. Further, the swinging motion of the block 7 increases the vibration of the drive belt.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art.

[0007]

In order to solve the above-mentioned problems, the present invention provides a convex portion and a concave portion for engaging adjacent blocks in the vicinity of the pitch line of the drive belt and in the main body of the block. Means are used which extend laterally in an arcuate cross-section.

Specifically, the present invention has a main body having a side surface slidably contacting the opposite inclined side walls of the driving / driven side pulley, a pillar protruding from the center of the main body, and a main body extending laterally from the pillar. A block having a band pressing plate that forms a space between the block and the block; in a drive belt having a band arranged between the block body and the pressing plate, one side of the block body near the pitch line of the drive belt A drive belt characterized in that the block is overlapped in a form in which a horizontally long convex portion is provided on the opposite side thereof, and a concave portion capable of receiving the convex portion is provided on the opposite side, and the convex portion is engaged with the concave portion of the adjacent block. provide.

[0009]

In the present invention, since the engaging portion formed by the convex portion and the concave portion of the block is provided near the pitch line of the drive belt,
The block slightly tilts around the engaging portion, and the interference between the steel band and the block can be suppressed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the present invention is shown in FIGS. 1 to 3. The usage state of the drive belt is substantially the same as that of FIG. 1, and the combination of the steel block and the steel band is substantially the same as that of FIG. The description thereof will be omitted, and the convex portion and the concave portion, which are the characteristic portions of the present invention, will be described below.

The steel block 7'constituting the drive belt 3 is in sliding contact with the side wall of the pulley and receives a compressive force from the pulley, and a pillar 10 extending from the center of the body 9.
There is a band pressing plate 12 which extends laterally from the pillar 10 and forms a space 11 between the pillar 10 and the main body 9. The pitch line P of the drive belt 3 on the upper side surface of the main body 9 (see FIGS. 3 and 6)
Protrusions 15 are provided in the vicinity. The span of the convex portion 15 is substantially equal to the span of the band pressing plate 12, and its cross section is arcuate or semicircular.

A concave portion 16 capable of receiving the convex portion 15 is provided on the side surface of the block 7'opposite to the side surface on which the convex portion 15 is provided. When the blocks 7'are superposed, the convex portion 15 of the block 7'is inserted into the concave portion 16 of the adjacent block. Convex part 1
5 and the engaging portion of the concave portion 16 are located in the vicinity of the pitch line of the driving belt, the block 7'is slightly inclined with the convex portion as a fulcrum even when the driving belt is curved so that the engaging portion is always in contact. Running with the block 7'to minimize the wear caused by the interference between the band and the block itself,
Hold down your head.

The ratio of the height of the convex portion 15 to the span is 0.05 to
Set to 0.2. The semicircular cross section of the convex portion 15 absorbs the shift between the adjacent blocks 7 ', and makes it difficult to transmit the swing of the blocks 7'to the adjacent blocks. Thus, even if the drive belt swings, the swing of the block itself is not promoted.

[0014]

[Effect] By rounding both ends of the convex portion, the blocks can be easily inserted between the blocks in the lateral direction, and the blocks can be closely stacked. This can eliminate the rattling of the blocks and reduce the resistance between the blocks.

[Brief description of drawings]

FIG. 1 is a front view of a block used in a drive belt of the present invention.

FIG. 2 is a side view of a block.

FIG. 3 is a perspective view of a block.

FIG. 4 is a plan view of a continuously variable transmission.

FIG. 5 is a perspective view of a conventional drive belt.

FIG. 6 is a side view of a conventional drive belt.

[Explanation of symbols]

 1, 2 Pulley 3 Drive belt 7, 7'Block 8 Band 9 Main body 10 Pillar 11 Space 12 Band pressing plate 15 Convex portion 16 Recessed portion

Claims (2)

[Claims] 1. A main body having a side surface that slidably contacts the opposite inclined side walls of a driving / driven side pulley, a pillar protruding from the center of the main body, and a space extending between the main body and a pillar extending laterally from the pillar. A block having a band pressing plate; a drive belt having a band arranged between the block main body and the pressing plate, wherein a laterally long convex portion is provided on one side surface of the block main body near a pitch line of the drive belt. A drive belt, characterized in that it has a concave portion on the opposite side thereof to receive the convex portion, and the blocks are overlapped with each other such that the convex portions are engaged with the concave portions of the adjacent blocks. 2. The drive belt according to claim 1, wherein the convex portion has a substantially semicircular cross section and has substantially the same span as the band pressing plate.