JPH0534353Y2 - - Google Patents

Description

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

The present invention relates to a V-belt assembly used, for example, in a belt-type continuously variable transmission for automobiles, and more particularly to a V-belt assembly with improved element shapes.

[Conventional technology]

As a transmission for automobiles, a belt-type continuously variable transmission, which has a structure in which a metal V-belt assembly is wound between a driving pulley and a driven pulley, each of which has a V-groove width that is variably controlled, has been generally known. ing. (Refer to Utility Model Application Publication No. 58-76844). FIG. 2 shows a metal V-belt assembly 6 that is wound between the drive pulley 3 on the primary shaft 2 side and the driven pulley 5 on the secondary shaft 4 side in such a belt type continuously variable transmission 1. It shows. This V-belt assembly 6 includes a pair of left and right band members 3 having a structure in which endless thin metal bands are laminated in multiple layers.
0, and a large number of metal plate elements 1 that are held by this band member 30 and arranged along the circumferential direction of the band member 30 to be joined to each other to form the main body of the V-belt.
It consists of 0. The element 10 has a V-shaped body whose left and right sides are in contact with the V-groove of the pulley, and is connected to the inner peripheral side of the V-belt assembly 6 through a pillar in the center of the body. The band members 30, 30 are inserted between the left and right shoulder portions of the body and the left and right ear portions of the head, and both band members 30, The pillars are located between 30 and 30. Further, an engagement protrusion is formed at the center of the front face of the head of the element 10, and an engagement hole into which the engagement protrusion of another element 10 can be fitted is formed at the center of the back face. and these many elements 1
0 indicates that in the straight line between the drive pulley 3 and the driven pulley 5, they are mutually positioned by the engagement of the engagement protrusion and the engagement hole, and in the straight line that extends from the drive pulley 3 and reaches the driven pulley 5. They are compressed and connected to each other to transmit power. Furthermore, the body of each element 10 is formed into a wedge cross section that gradually becomes thinner from the pitch line P to the inner circumferential side, and due to this wedge cross section, each element 10 is tilted relative to each other so that the outer circumferential side is open. It is designed to be wound in an arc shape along the driving pulley 3 and the driven pulley 5 (see Japanese Utility Model Application No. 131148/1983).

[Problem that the idea aims to solve]

Here, each element 10 in the conventional general V-belt assembly 6 described above is set to have a substantially uniform thickness at the mutually contacting portion on the outer peripheral side from the pitch line P so that the elements 10 can be aligned linearly. However, if the mutual contact portions of the elements 10 are more or less high, the V-belt assembly 6 that is let out from the drive pulley 3 and reaches the driven pulley 5
In the compression-side linear portion 6a, the alignment of each element 10 may curve toward the outer or inner circumference of the belt, and this tendency increases as the linear portion 6a is longer. When the alignment of each element 10 curves toward the outer or inner circumference of the belt, the pitch line P fluctuates as shown in P ₁ and P ₂ and string vibration occurs. In this case, each element 10 There was a risk that the band member 30 would be damaged by being hit with force, and there was a problem with its durability. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a V-belt assembly that is capable of reducing and preventing string vibrations in the compression-side straight portion during use and improving durability.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a large number of elements that are held by a pair of non-stretchable and flexible left and right band members, aligned in the circumferential direction of the band members, and joined together to form the main body of the V-belt. In the V-belt assembly, each element has a body located on the inner circumferential side with both the band members sandwiched therebetween, and a head located on the outer circumferential side of the body sandwiching the band members. They are mutually positioned by the engagement of the engagement protrusions and engagement holes on both sides of the head, and are mutually positioned by the wedge cross section of the body that is formed gradually thinner from the pitch line on the body to the inner circumference. In a V-belt assembly that is structured to be wound around a pulley in a tilted state, contact parts that mutually contact other elements when each element is linearly aligned are placed on the left and right sides of the body on the outer peripheral side of the pitch line of each element. The shoulder portion and the left and right ear portions of the head are provided, and the thickness of the contact portions provided on the left and right ear portions is set to be equal to or slightly thicker than the thickness of the contact portions provided on the left and right shoulder portions.

[Effect]

The V-belt assembly of the present invention, which employs such a means, is in use when it is wrapped around the drive pulley and the driven pulley to transmit power, and the compression-side linear portion unwound from the drive pulley is not engaged. The elements, which are mutually positioned by engagement between the protrusions and the engagement holes, are compressed and joined to each other at contact portions located at the left and right shoulder portions of the body and the left and right ear portions of the head, thereby transmitting power. Here, the thickness of the contact portions of the left and right ear portions is set to be equal to or slightly thicker than the thickness of the contact portions provided on the left and right shoulder portions, so the compression side linear portion of the V-belt assembly is aligned in a substantially straight line. The strings are held in a state or in an aligned state in which they are slightly curved toward the outer circumference, and the curve toward the inner circumference is prevented, thereby preventing string vibration from occurring.

【Example】

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1a and 1b, the V-belt assembly 6 of the embodiment will be explained in detail. As in the past, this V-belt assembly 6 has an endless belt shape with a small radius of curvature so as to reduce the bending stress that occurs when it is wrapped around a pulley. A pair of left and right band members 30, 30 formed by laminating thin metal bands in multiple layers, and a V-belt that is held by both band members 30, 30 and arranged along the circumferential direction of the band members 30, 30 and joined together to form a V-belt. It is composed of a large number of elements 10 made of metal plates forming the main body. The element 10 has a V groove corresponding to the V groove of the pulley.
A body 12 having a letter-shaped side surface 11 and forming the inner circumferential side of the V-belt assembly 6 and a head 14 forming the outer circumferential side of the V-belt assembly 6 are connected to each other via a pillar 13 at the center in the left-right direction. It is shaped like this. A dimple 15 as an engaging protrusion is provided on the front side of the head 14, and a dimple 15 as an engaging protrusion is provided on the back side.
A dimple hole 16 is formed as an engagement hole into which a dimple 15 protruding from 4 can be fitted. In addition, in order to enable each element 10 to be tilted so that the outer circumferential side is open so that the V-belt assembly 6 can be wound around the pulley in an arc shape, the inner circumferential side is placed on the front side of the body 12. An inclined surface 17 forming a thin wedge cross section is formed. Between the body 12 and the head 14 with the pillar 13 in between, both the band members 30, 30 are provided.
is inserted, and both of these band members 30, 30
is wound around shoulder portions 18 formed at the upper portions of both sides of the body 12 and having a medium-height cross section.
Furthermore, the ear portions 19, 19 formed on the left and right sides of the head 14 engage with the outer peripheral surfaces of both the band members 30, so that the element 10
It is now possible to prevent people from leaving the age of 30. Further, on both the upper and lower sides of the pillar 13, cutout fillets 20 are formed to prevent contact with the band members 30, 30, and at the bottom of the body 12,
A pair of left and right notches 21, 21 are provided to equalize the distribution of the pressing force by the band members 30, 30. Here, contact portions 18a, 18a are formed on the outer peripheral side of the pitch line P on the front surface of each of the elements 10, for example, and are disposed on the left and right shoulder portions 18, 18 of the body 12, and contact portions 18a are bulged. Contact portions 19a, 19a are disposed on the left and right ear portions 19, 19, and are formed in a bulging manner. The formation positions and thicknesses of the contact portions 18a, 18a, 19a, and 19a are set so as to reduce the compliance value toward the inner or outer circumference of the V-belt assembly 6. Here, the above compliance value is determined by stacking the elements 10 in the number corresponding to the compression side linear portion 6a of the V-belt assembly 6 as shown in FIG. 1c, and applying a pressing force calculated from the transmitted torque to both ends. A vertical force Fv directed toward the body 12 or the head 14 is applied to the central portion, and the resulting deflection δ is divided by the vertical force Fv, resulting in a value Cv (Cv=δ/Fv), which is defined as the compliance value Cv. Therefore, in one embodiment, the shoulder portions 18, 18
The compliance value Cv is made small by increasing the distance between the contact portions 18a, 18a of the ear portions 19, and the contact portions 19a, 19a of the ear portions 19, 19, and by making the thicknesses of both the same. In addition, as another example, compliance value
The contact portions 19a, 19a of the ear portions 19, 19 are set to be slightly thicker than the contact portions 18a, 18a of the shoulder portions 18, 18 within a range where Cv is small. V according to the embodiment of the present invention configured as described above
The belt assembly 6 transmits power by being wound around between a driving pulley 3 and a driven pulley 5 as shown in FIG. In the straight portion 6a, the elements 10, which are mutually positioned by the engagement of the dimples 15 and dimple holes 16, are connected to the left and right shoulder portions 18, 18 of the body 12 and the left and right ear portions 1 of the head 14.
Contact parts 18a, 18a, 1 arranged at 9, 19
9a and 19a are compressed and connected to each other to transmit power. Here, in one embodiment in which the thickness of the contact parts 18a, 18a and the thickness of the contact parts 19a, 19a are set to be the same, the compliance value Cv is small, so the V
The compression side linear portion 6a of the belt assembly 6 is maintained in a substantially linear alignment state, and is prevented from curving toward the outer circumference and the inner circumference, thereby reducing and preventing the occurrence of string vibration. In addition, the contact portion 19 is lower than the contact portion 18a,
In another example in which a and 19a are set slightly thicker,
The compression-side straight portion 6a of the V-belt assembly 6 is aligned and held in a slightly curved state toward the outer circumference within a small range of compliance value Cv, preventing it from curving toward the inner circumference and reducing the occurrence of string vibration. Prevented.

[Effect of the idea]

As explained above, in the present invention, when the drive pulley is wound between the drive pulley and the driven pulley to transmit power, the engagement protrusion and the engagement hole are The elements positioned relative to each other are compressed and joined to each other at contact portions located at the left and right shoulder portions of the body and the left and right ear portions of the head, thereby transmitting power. According to the present invention, the thickness of the contact portions of the left and right ear portions is set to be equal to or slightly thicker than the thickness of the contact portions provided on the left and right shoulder portions.
The compression-side straight portion of the V-belt assembly is maintained in a generally straight alignment or in an alignment slightly curved toward the outer circumference, thereby preventing it from curving toward the inner circumference. Therefore, it is possible to reduce and prevent string vibrations in the compression-side linear portion of the V-belt assembly during use, thereby improving durability.

[Brief explanation of drawings]

FIG. 1a is a cross-sectional view perpendicular to the circumferential direction of an embodiment of the V-belt assembly according to the present invention, FIG. 1b is a longitudinal sectional view of the center portion of the embodiment along the circumferential direction, FIG. d is an explanatory diagram of the operation of one embodiment, and FIG. 2 is an explanatory diagram of the usage state of one embodiment and a conventional example. 10...Element, 12...Body, 13...
...Pillar, 14...Head, 15...Dimple, 16...Dimple hole, 17...Slanted surface, 18...Shoulder part, 18a...Contact part, 1
9...Ear part, 19a...Contact part, 30...Band member.

Claims (1)

[Claims for Utility Model Registration] A V-belt having a large number of elements held by a pair of non-stretchable and flexible band members on the left and right, aligned in the circumferential direction thereof, and joined to each other to form the main body of the V-belt. In the belt assembly, each of the above-mentioned elements has a body located on the inner periphery side of the band members and a head located on the outer periphery side thereof, which are connected to each other via a pillar located between the two band members. They have a continuous shape and are mutually positioned by the engagement of the engagement protrusions and engagement holes on both sides of the head, and are mutually tilted by the wedge cross-section of the body that is formed gradually thinner from the pitch line on the body to the inner circumference. In the V-belt assembly, which is structured to be wrapped around a pulley, contact parts that come into contact with other elements when each element is linearly aligned are placed on the outer circumferential side of the pitch line of each of the above elements, and on the left and right shoulder parts of the body. A V-belt assembly provided at left and right ear portions of the head, wherein the thickness of the contact portions provided at the left and right ear portions is set to be equal to or slightly thicker than the thickness of the contact portions provided at the left and right shoulder portions. .