JP2000220706A - Shoe fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the fitting structure by forming an engagement part in one of arms so as to be engaged with an engagement piece of a shoe, and providing a pair of claws in the other of the shoe so as to pinch the fitting part of the arm for fitting. SOLUTION: A metal arm is formed of two side plates 5, 5 and bushes 3, 4. One end of each side plate 5, 5 is formed with each projected engagement part 6, 6. A shoe 2 is a molding of the resin material, and has an engagement piece 7 in one end thereof and a pair of claws 8a, 8b in the other end thereof. The engagement piece 7 is curved into a U-shape, and engaged with the engagement part 6 formed at the end of the arm and the bush 4 is fitted in a space 9 between the pair of claws 8a, 8n. Namely, the bush 4 is pinched by both the claws 8a, 8b. With this structure, structure and the manufacture can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tensioner lever which constantly applies an appropriate tension to a chain wound around a sprocket of a drive shaft and a driven shaft, and a chain guide which is arranged on the opposite side of the tensioner lever. The present invention relates to a shoe mounting structure for a chain damper.

[0002]

2. Description of the Related Art FIG. 4 shows a general chain drive. A chain (a) has a drive shaft (b) and a driven shaft (c).
The chain (a) is wrapped around the sprockets (d) and (e) attached thereto, and the chain (a) is pressed by the tensioner lever (f), so that an appropriate tension is constantly applied. Therefore, the vibration of the chain (a) running along with the rotation of the two sprockets (d) and (e) is suppressed, and the vibration is transmitted to the driven shaft (c) without delay. Further, by suppressing the vibration, the impact force acting on the chain (a) is eliminated, and the chain life can be improved.

The tensioner lever (f) is pressed by the tensioner (g) to act on the chain (a). There are various forms of the tensioner lever (f). A rubber or resin shoe is bonded to the arm, or the shoe is formed integrally with the arm. When the shoe is bonded to the arm, the shoe may be peeled off. When the shoe is integrally formed with the arm, a molding die is required, and the manufacturing cost is increased.

[0004] Therefore, the separately manufactured arm and shoe are
A tensioner lever assembled and fixed without using an adhesive is known. The chain guide rail provided with a synthetic resin shoe according to Japanese Utility Model Publication No. 7-36201 has a structure in which the shoe is detachably attached to a shoe support member. That is, the end hook piece formed on the shoe is engaged with the chain running start end of the shoe support member, and the L-shaped side engaging piece formed on the shoe is engaged with and attached to the shoe support member. I have.

As described above, the shoe is detachably attached to the shoe support member. However, the operation of engaging the L-shaped side engaging piece formed on the shoe with the shoe support member is troublesome. However, the mounting structure is complicated and the manufacturing cost is high.

[0006]

As described above, the conventional tensioner lever has the above-mentioned problems. The problems to be solved by the present invention are these problems. The arm and the shoe are separately manufactured, and the shoe is detachably attached to the arm, and the mounting structure is simple. In addition, the present invention provides a shoe mounting structure for a tensioner lever which is easy to assemble and whose production cost is low. On the one hand, structurally common chain guides and chain dampers are also of interest.

[0007]

The tensioner lever to which the present invention is applied is a combination of a metal arm and a resin shoe, and the shoe has a detachable mounting structure. The arm is composed of two side plates and a connecting portion such as a bush or a pin provided at both ends of the side plate. One connecting portion serves as a shaft for swinging the tensioner lever, and the other connecting portion has a tensioner lever as a chain. A tensioner for pressing to the side is connected. Here, the specific structure of the arm is not particularly limited, and for example, a structure in which the two bushes serving as the connecting portions are juxtaposed at a predetermined interval by press-fitting into the holes formed in the side plates can be adopted. Alternatively, both side plates and both connecting portions can be integrally manufactured.

An engaging portion is formed so as to protrude from the side end of the side of the swing shaft, which is the starting end of the chain. One shoe is made of resin or hard rubber, and is attached to the arm without using an adhesive or a fastener such as a screw. Therefore, a hook-shaped engaging piece is formed on the running start end side of the chain, and a claw is formed on the other side. The claws form a pair and have a space between the claws where a connecting portion such as a bush fits. Therefore, the engaging piece is locked to the engaging portion, and is fitted into a space formed between the claws so as to sandwich the connecting portion between the claws.

On the front side of the shoe (the side on which the chain runs), a guide is projected on both sides so that the running chain does not come off, and a convex portion is formed on the inside (back side). The convex portion may be formed over the entire length of the shoe, but may be provided separately in a plurality of portions, so that the convex portion is fitted between both side plates of the arm so that the shoe does not laterally shift. Conversely, the convex portion may be positioned outside the side plate so that the side plate fits between the two convex portions. Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

[0010]

FIG. 1 is an embodiment showing a tensioner lever according to the present invention, which comprises an arm 1 and a shoe 2,
Both ends have a bush 3 and a bush 4. 14C is a cross-sectional view taken along the line AA of FIG. 14A, and FIG.
The shoe 2 is simply attached to the arm 1, as shown in a B sectional view.

FIG. 2 shows an arm 1, which is made of metal and has two side plates 5, 5 and bushes 3, 4.
The bushings 3, 4 are connecting members for fitting in the holes formed in the side plates 5, 5 to fix the side plates 5, 5 in parallel and at a predetermined interval. Projecting engaging portions 6 and 6 are formed on one end (chain running start end) of the side plates 5 and 5. The arm 1 shown in FIG.
Although it has a structure in which the side plates 5 and 5 and the two bushes 3 and 4 are assembled, for example, it can be manufactured by cutting out a die cast material. FIG. 3 shows an embodiment showing the shoe 2, which is a molded product made of resin and has an engaging piece 7 at one end and a pair of claws 8a and 8b at the other end. ing.

The engaging piece 7 is bent into a U shape and can be engaged with the engaging portion 6 formed at the end of the arm, and the pair of claws 8a and 8b have the bush 4 in the space 9 therebetween. fit. That is, the bush 4 can be sandwiched between the claws 8a and 8b. The shoe 2 rests on the upper surface 10 of the arm 1,
The convex portion 1 formed on the lower surface 12 so as not to come off from the arm 1
1 and 11 are fitted between both side plates 5 and 5. As shown in FIG. 3B, a cross section taken along the line C-C shows that the protrusion 11 slightly projects from the center of the lower surface 12. Here, the protrusions 11 are provided on both sides of the shoe, and the side plates 5 and 5 can be sandwiched between the protrusions 11 and 11.

On the other hand, guides 14 and 14 are provided along both sides of the upper surface 13 of the shoe 2 to prevent the running chain from coming off the tensioner lever. In the above embodiment, the tensioner lever has been described. However, since the chain guide and the chain damper are the same, detailed description will be omitted. As described above, the shoe mounting structure such as the tensioner lever of the present invention is configured such that the engaging piece at the tip of the shoe is engaged with the engaging portion at the arm end, and the pair of claws provided at the other end are connected to the connecting portion at the arm end. The following effects can be obtained.

[0014]

The tensioner lever, chain guide, and chain damper to which the present invention is applied are constructed by attaching a resin shoe to a metal arm, so that the structure and production are simplified and the production cost is reduced. .
That is, the engaging piece of the shoe is engaged with the engaging portion provided at the arm end, and a pair of claws formed on the shoe is engaged with and attached to the connecting portion at the other end of the arm. Therefore, when the shoe is worn, it can be replaced with a new one.
Although the shoe is attached with the engaging piece and both claws, the convex portions provided on the lower surface are fitted to the both side plates of the arm and do not displace from the arm and come off.

[Brief description of the drawings]

FIG. 1 is an embodiment showing a tensioner lever according to the present invention.

FIG. 2 is a specific example of an arm.

FIG. 3 is a specific example of a shoe.

FIG. 4 shows a conventional tensioner device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arm 2 Shoe 3 Bush 4 Bush 5 Side plate 6 Engagement part 7 Engagement piece 8 Claw 9 Space 10 Upper surface 11 Convex part 12 Lower surface 13 Upper surface 14 Guide

Claims (3)

[Claims] 1. A shoe mounting structure for a tensioner lever for constantly applying a proper tension by pressing a chain wound around both sprockets, wherein the tensioner lever includes a metal arm and a resin shoe. The engaging piece of the shoe is engaged with the engaging portion formed on one side of the arm, and the fitting portion such as the bush or the pin of the arm is sandwiched and attached by a pair of claws provided on the other side of the shoe, and A shoe mounting structure for a tensioner lever, wherein a projection provided on a lower surface of the shoe is engaged with both side plates of the arm to prevent displacement. 2. A shoe mounting structure for a chain guide for contacting and guiding a chain wound around both sprockets, wherein the chain guide comprises a metal arm and a resin shoe, and one of the arms is attached to one of the arms. The engaging piece of the shoe is engaged with the formed engaging portion, and the fitting portion such as the bush or the pin of the arm is sandwiched between a pair of claws provided on the other side of the shoe and attached. A shoe mounting structure for a chain guide, wherein the provided protrusions are engaged with both side plates of the arm to prevent displacement. 3. A shoe mounting structure for a chain damper arranged parallel to a chain running without contact with a chain wound around both sprockets, wherein the chain damper comprises a metal arm and a resin shoe. And the engaging piece of the shoe is engaged with the engaging portion formed on one side of the arm, and the pair of claws provided on the other side of the arm sandwich the fitting portion such as the bush or pin of the arm and attached. A shoe mounting structure for a chain damper, wherein a convex portion provided on a lower surface of the shoe is engaged with both side plates of the arm to prevent positional deviation.