JPH0640357Y2 - Chain tensioner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a chain tensioner mainly applied to a vehicle chain.

2. Description of the Related Art Conventionally, a chain tensioner that absorbs the elongation of a rotating traveling chain and presses it into tension to prevent vibration is used, and this chain tensioner reduces wear caused by sliding contact with the chain. For this reason, there are some in which a resin material is attached to the sliding surface.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned conventional technology, although the wear-reducing effect of the resin material is recognized, the sliding surface of only the resin material has the wear-reducing effect against sliding accompanied by vibration of the chain, impact, etc. It wasn't enough.

The present invention intends to provide a chain tensioner having excellent wear resistance by overcoming the drawbacks of the conventional techniques.

Means and Actions for Solving the Problems In accordance with the above-mentioned object, the present invention provides a surface slidingly contacted with a chain,
This is a chain tensioner that is equipped with a wear-resistant resin material that is impregnated with fibers oriented in a direction perpendicular to the sliding direction of the chain.The chain tensioner keeps the oil well retained between the fibers. While making sliding contact with Chien.

Examples Examples will be described with reference to the drawings.

FIG. 1 shows a chain tensioner 1 applied to a chain 5 stretched between a shaft 4 that drives a crankshaft 2 and a camshaft 3 of an engine. One end 16 of the chain tensioner 1 is a base of the engine. A pressing piece 9 abuts on a surface of the back surface 8 opposite to the inner surface 7 that is pivotally supported on the shaft 6 and abuts the chain 5, and the pressing piece 9 is attached to the shaft 10 fixed to the base body. The tensioner 1 is constantly pressed by the attached spring (not shown) in the direction in which it is pressed against the chain 5.

As shown in FIGS. 2 and 3, the tensioner 1 has a bow-shaped overall shape, and the substrate 11 on the back side 8 side is made of a strong thin plate such as carbon tool steel, and its inner surface is made of elastic material such as rubber. Material
12 is fixed by baking, and on the surface thereof, a wear-resistant resin material 14 having a low friction coefficient such as a fluororesin impregnated with a fiber 13 such as glass in a direction orthogonal to the sliding direction of the chain is provided. The side plate 5a (pin link plate / roller link plate) of the chain 5 is fixed and is in sliding contact with the side plate 5a.

Since the present embodiment is constructed as described above, the chain tensioner 1 has the shaft 6 whose one end 16 is pivotally supported by the pressing piece 9.
The curved surface is pressed against the chain 5 under the rotational force in the direction of contacting the chain 5 around the center of the chain, absorbs the slack of the chain and keeps the chain in a tensioned state, and prevents vibration (waviness). Can be run smoothly.

Further, since the chain tensioner 1 is provided with a tough thin plate substrate 11 such as carbon tool steel or the like and an elastic material 12 such as rubber or the like on the back side thereof, the vibration of the chain 5 can be further absorbed and relaxed. Further, the abrasion-resistant resin material 14 on the surface of the elastic material 12 can reduce the sliding resistance at the time of sliding contact of the chain 5 with the side plate 5a to reduce the wear of both the side plate 5a and the chain tensioner 1.

Since the resin material 14 is impregnated with the glass fiber 13, it is possible to further improve the wear resistance of the resin material 14 and improve the durability, and the direction thereof is orthogonal to the sliding direction of the chain. Since they are oriented in the direction, the oil applied to the surface of the resin material 14 is well retained between the fibers even by sliding contact with the chain, and the durability due to lubrication can be improved.

3 and 4 show another embodiment of the chain tensioner 1, in which a groove 15 is provided in the central portion of the chain tensioner 1 in the longitudinal direction from 14 layers of resin material to 12 layers of elastic material.
While the chain (a plurality of rows) 5 is running, the end edge of the side play 5a is guided by the groove 15. In other configurations, there is no particular difference from the previous embodiment. The grooves 15 may be arranged in two rows in advance with the glass fibers 13 and may be provided in the middle, or the glass fibers 13 may be provided in the tensioner 1.
It may be provided in the center after impregnation over the entire width of.

Since this embodiment has the above-mentioned structure, in addition to the effect of the previous embodiment, the chain 5 is guided by the concave groove 15 to travel, so that left and right steady rests and further vibration prevention can be achieved.

Effect of the Invention In order to suppress vibration due to load fluctuation during chain traveling and reduce wear of the side plate sliding portion due to the vibration, the chain tensioner requires a predetermined length. Since fibers are impregnated in the wear-resistant resin material that makes sliding contact with the chain, it is possible to further improve the wear resistance of the resin material and improve the durability. Furthermore, the direction of this fiber is the sliding direction of the chain. Since they are oriented in the orthogonal direction, the oil applied to the surface of the resin material does not disperse during sliding contact with the chain and is well retained between the fibers, increasing the durability of the chain tensioner by lubrication and The tensioner follows well so that the sliding resistance is reduced and partial wear can be prevented over the entire length of the predetermined length.

[Brief description of drawings]

FIG. 1 is a front view of a tensioner according to the present invention applied to an engine chain, FIG. 2 is a front view of the tensioner, FIG. 3 is a plan view of the same, and FIG. 4 is a front view of another embodiment.
FIG. 5 is a plan view of the same. DESCRIPTION OF SYMBOLS 1 ... Chain tensioner, 5 ... Chain, 6 ... Shaft, 9 ... Pressing piece, 10 ... Shaft, 11 ... Substrate, 12 ... Elastic material, 13 ... Glass fiber, 14 ... Abrasion resistant resin material, 15 ... Groove, 16 …edge.

Claims (1)

[Scope of utility model registration request] 1. A chain tensioner having a wear-resistant resin material impregnated with fibers in a direction in which the fibers slide in contact with the chain in a direction perpendicular to the sliding direction of the chain.