JPH0559016U - Chain type power transmission belt - Google Patents

Abstract

(57) [Summary] [Purpose] To smoothly bend the link plate to reduce abnormal noise and noise, and to make it difficult for the chip body to be removed from the pin. [Structure] Chain-type power in which a group of link plates are flexibly connected in a longitudinal direction by pins, and a chip body having end faces in contact with a pulley wall surface is fitted to both ends of a pin protruding from an outermost outer link plate. In the transmission belt, a contact portion 32 having a convex curved surface on one side as the pin and a rocker pin 31 provided with a concave depression 33 on the back of this surface are arranged so as to abut each other at the contact portion 32. ,
Groove 35 in which locking body 41 having chip body 40 provided in its cylindrical portion is provided at both ends of rocker pin 31, and recess 3 described above.
The locker pin 31 is mounted on the rocker pin 31 by being fitted into the locker pin 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chain type power transmission belt, and more particularly to a chain type power transmission belt in which a tip body contacting a wall surface of a pulley is fitted in a pin.

[0002]

[Prior Art]

 Today, rubber V belts, metal chains, and metal belts have been proposed as high load transmission belts applied to continuously variable transmissions of automobiles. Among them, the metal chain belt has a structure in which a plurality of link plate groups are flexibly coupled by a pin, and a V-shaped block having a tapered surface in contact with the V belt is fitted between the pins.

Further, as a belt of the same kind, a belt in which both ends of a pin for connecting a link plate group are tapered surfaces to be engaged with a wall surface of a V pulley is also disclosed in, for example, Japanese Utility Model Publication No. 63-37846. It is known that the belt of this type transmits sufficient power by increasing the diameter of the pin.

Further, as still another chain belt, a freely movable tip body is attached to both ends of a pin connecting a plurality of link plate groups as disclosed in Japanese Patent Laid-Open No. 63-2119937. However, when the belt enters the pulley, the tip end surface is fitted to the side wall of the pulley, and the tip itself is rotated to reduce vibration, rolling, or collision when the belt enters the pulley. Belts that make them known are also known, and attempts are being made to put them into practical use.

[0005]

[Problems to be solved by the device]

 However, of the above belts, the chain type belt, in which the tip body is attached to both ends of the pin, is designed so that the tip body slightly swivels around the pin, and therefore, especially under high load transmission conditions. When the belt enters or leaves the pulley, the lateral pressure applied on the contact line between the side wall of the V-pulley and the tip body or the pulling force in the longitudinal direction of the belt disperses with different magnitudes on this contact line, and this is the tip. The tip body tries to rotate positively to generate a rotation moment in the body. As a result, it has been clarified that the impact noise between the pulley and the tip body when the belt enters the pulley is greatly reduced.

However, when the belt enters the pulley and the link plate group bends, the structure in which it is difficult for lubricating oil to enter between the link plate group and the pin causes abnormal noise when the link plate bends. Not only that, but there was a problem that the pin burned due to oil shortage, resulting in fatigue damage to the pin.

Further, since the tip body constantly turns slightly around the pin, uneven wear of the sliding surface inside the tip body is promoted, the gap between the tip body and the pin increases, and the tip body falls off from the pin. There was something to do. In particular, the inner sliding surface of the chip body was most worn at the inlet, and the pulling force between the chip body and the pin decreased. Moreover, the means for inserting this kind of chip body into the pin is a shrink fit method, that is, after the chip body is heated and expanded, it is inserted into the pin and cooled, which takes a lot of time and effort. I needed it. The present invention solves such problems in particular, and smoothly bends the link plate to reduce abnormal noise and noise, and makes it difficult for the tip body to separate from the pin. The purpose is to provide a belt for use.

[0008]

[Means for Solving the Problems]

 That is, in the present invention, the link plate group is flexibly connected in the longitudinal direction by the pin, and the tip body protruding from the outermost outer link plate is fitted with the chip body having the end surface in contact with the pulley wall surface. In the chain type power transmission belt that is worn, the contact part with a convex curved surface on one side as the pin and the rocker pin with a concave recess on the back of this surface are placed in contact with each other at the contact parts. However, there is a chain type power transmission belt mounted on the rocker pin by fitting the locking body provided with the chip body on the cylindrical portion into the groove provided on both ends of the rocker pin and the above-mentioned recess.

[0009]

[Action]

 In the chain type power transmission belt of the present invention, since the rocker pins are arranged in contact with each other at the contact portions having the convex curved surfaces, when the belt is wound around the pulley, the flexion of the link plate is prevented. One of the rocker pins rolls smoothly at the contact area. In addition, the tip body prevents the lock body from disengaging from the rocker pin by locking the lock body provided on the cylinder part to the groove sections provided at both ends of the rocker pin, and also, a part of the lock body is attached to each rocker pin. The position of the chip body is secured so that the chip body is fitted into the provided recess to prevent the chip body from rotating and the end face of the chip body is always in contact with the wall surface of the pulley. Moreover, since the locking body of the chip body is elastically deformable, it is easy to insert it into the rocker pin and mount it.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a partial perspective view of a chain type power transmission belt according to the present invention, and FIG. 2 is a partial sectional view of FIG. In the chain type power transmission belt 1, a plurality of main link plates 10 arranged in parallel at predetermined intervals in the belt width direction and substantially the same shape arranged between these main link plates 10. The other sub-link plate 20 is connected so that the through-holes 11 provided on both sides thereof can be bent in the longitudinal direction of the belt by the pins 30 into which the through-holes 11 are inserted. It is configured endlessly.

The through hole 11 is provided with a raised portion 12 protruding from the inner surface. Also, two pins 30 are fitted into the through hole 11 by bringing two rocker pins 31, 31 into contact with each other. The rocker pin 31 has a contact portion 32 having a convex curved surface on one side and a concave portion 33 on the back of this surface, and the contact portion 32 abuts each other, and the concave portion 33 forms the through hole 11. Is fitted to the raised portion 12 of the. As a result, when the belt is wound around the pulley, one of the rocker pins 31 rolls smoothly at the contact portion 32 in accordance with the bending of the link plates 10 and 20.

At the end 34 of the rocker pin 31 protruding from the outer wall 13 of the so-called outer link plate outside the belt 1, a tip body 40 that engages with the wall surface of the V pulley is fitted. The tip body 40 is a cap body composed of a locking body 41 provided on the cylindrical portion 42 and a pulley contacting portion 43 having a flat, conical or truncated cone shape. The locking body 41 has a partition portion 44. It is separated into a plurality of parts through which it can be elastically deformed by curving inward.

When the chip body 40 is inserted into the rocker pin 31, the locking body 41 is elastically deformed and the end portion 34 of the rocker pin 31 is fitted into the groove portion 35 provided on the outer periphery, and the rocker pin 31 of the chip body 40 is inserted. The other locking body 41 is fitted into the recess 33 to prevent the chip body 40 from rotating.

As shown in FIG. 5, the main link plate 10 and the sub link plate 20 each have a communicating oil tank 14 obtained by knurling on the surface thereof. This oil feeder 14 introduces oil supplied from the outside of the belt between the link plates to improve lubricity between the link plates 10 and 20 and between the link plates 10 and 20 and the rocker pin 31.

Further, the surface of the rocker pin 31 may be subjected to shell blast treatment with a porous material. As a result, a small depression is formed on the surface of the rocker pin 31, and oil is accumulated and adsorbed in the depression to improve the oil retaining property, and wear resistance due to sliding between the rocker pin 31 and the link plates 10 and 20. Is greatly improved. Further, since the adsorbed oil exudes from the rocker pin 31, burning of the rocker pin 31 due to oil shortage does not occur. It is more effective to boil the rocker pin 31 in oil after subjecting the rocker pin 31 to a cast blast treatment with a porous material.

The porous material is a porous material such as carbon or silica or a sintered metal material having a particle size of 500 to 1000 μm. It is formed to be uneven.

[0017]

[Effect of the device]

 As described above, in the chain type power transmission belt of the present invention, since the rocker pins are arranged in contact with each other at the contact portions having the convex curved surfaces, when the belt is wound around the pulley, Depending on the bending of the plate, one of the rocker pins rolls smoothly while rolling at the contact part, reducing noise and noise when driving the belt. In addition, the chip body locks the locking body provided on its cylindrical portion in the grooves formed at both ends of the rocker pin to prevent the chip body from being separated from the rocker pin, and further, a part of the locking body is used for each rocker pin. The chip body is fitted in the recess provided in the to prevent rotation of the chip body and its position is ensured so that the end face of the chip body is always in contact with the wall surface of the pulley to enable reliable power transmission. Moreover, since the locking body of the chip body is elastically deformable, it is easy to insert it into the rocker pin and mount it. Furthermore, an oil groove communicating with at least one surface of the link plate is provided, and since the pin that is subjected to the shell blast treatment with a porous material is used, it is between the link plates or between the link plate and the pin. It is possible to maintain lubricity by constantly supplying oil, prevent the occurrence of burns on the link plates and pins, and improve the life of the belt.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a chain type power transmission belt according to the present invention.

FIG. 2 is a partial cross-sectional view of FIG.

FIG. 3 is a side view of the chain type power transmission belt shown in FIG. 1 when a tip body is removed.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a perspective view of a chip body used.

FIG. 6 is a plan view of a link plate used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main link plate 11 Through hole 12 Raised part 14 Oil tank 20 Sub link plate 31 Rocker pin 32 Contact part 33 Dimple part 35 Groove part 40 Chip body 41 Locking body

Claims (2)

[Scope of utility model registration request] 1. A chain in which a link plate group is flexibly connected in a longitudinal direction by a pin, and a chip body having an end surface in contact with a pulley wall surface is fitted to both ends of a pin protruding from an outermost outer link plate. In a power transmission belt, a contact part having a convex curved surface on one side as the pin and a rocker pin provided with a concave recess on the back of this surface are arranged in contact with each other at the contact part, and a chip body is provided. A chain type power transmission belt, characterized in that a lock body provided on the cylinder portion is fitted to a rocker pin by fitting it into a groove portion provided at both ends of the rocker pin and the recess. 2. The chain type power transmission belt according to claim 1, wherein an oil groove communicating with at least one surface of the link plate is provided.