JPH05332379A - Torsion spring - Google Patents

Abstract

PURPOSE:To facilitate fitting workability and simplify manufacture while preventing both end parts from interfering with a peripheral object by improving a shape of the both end parts of a torsion spring, and mounting the both end parts to the base end part of an arm and a cup without protruding the both end parts to the outside. CONSTITUTION:In a torsion spring 1 whose both end parts 1a are mounted respectively on an arm and a cup 5 opposed to each other, engaging recessed parts 7, inserted to engage between two stopper parts 9 formed with a predetermined space apart in inner/outer directions orthogonal to a spring mounting direction in the inside of the arm and the cup 5, are formed in each end part 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a torsion spring used in an auto tensioner or the like.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 7, in an automatic tensioner for adjusting the tension of a belt, a base end c of an arm b that rotatably supports a pulley a and a base end c of the arm b are provided. A torsion spring e is arranged between the cup d and the cup d arranged to face each other. The torsion spring e is arranged so as to surround the damping material f arranged between the base end c of the arm b and the cup d, and the base end c of the arm b is arranged.
And the mounting holes g and h formed in the cup d, respectively,
As shown in FIG. 6, both ends i, i bent so as to project outward are inserted from the inside.

[0003]

However, in the above-mentioned conventional torsion spring e, both ends i, i are inserted into the mounting holes g, h from the base end c of the arm b and the inside of the cup d. Therefore, the assembling property is poor and the both ends i, i project outward from the mounting holes g, h, and there is a possibility that the both ends i, i interfere with surrounding objects. Also,
Both ends i, i must be bent at the time of manufacture, and a large force is required to bend them, which makes it difficult to manufacture, and there is a problem in that the protrusion dimension is difficult to accurately appear.

The present invention has been made in view of the above points, and an object of the present invention is to improve the shape of both ends of a torsion spring so that both ends of the torsion spring do not project to the outside and the base of the arm. It can be attached to the end and the cup so that both ends do not interfere with surrounding objects,
It is intended to facilitate the assembling work and the production.

[0005]

In order to achieve the above-mentioned object, the solution means of the present invention is a torsion spring which is attached to two mounting bodies whose both ends are opposed to each other. It is configured to form an engaging portion that is inserted between two engaging portions that are formed at predetermined intervals in the inner and outer directions orthogonal to the mounting direction and engages with each other at the above-mentioned end portions.

[0006]

In the present invention, the torsion springs are formed with a predetermined interval in the inner and outer directions orthogonal to the spring mounting direction inside the two mounting bodies facing each other with the engaging portions formed at both ends. The two end portions are located inside the attachment body and do not project to the outside because they are attached to both attachment bodies by inserting and engaging between the two locking portions that have been formed. do not do. Further, since the engaging portion of each end portion is simply inserted and engaged between the two locking portions of the attachment body, each end portion can be easily attached to the attachment body. In addition, the bending of each end is not required, and therefore the protrusion size is not taken into consideration, and the torsion spring is easily manufactured.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 shows a case where a torsion spring 1 wound in a coil shape according to a first embodiment of the present invention is applied to an auto tensioner A. The torsion spring 1 is
Arm 3 as a mounting body for rotatably supporting pulley 2
The plate-like base end portion 4 of the arm 3 and a cup 5 as an attachment body which is arranged on the base end portion 4 of the arm 3 and faces each other at a predetermined interval are interposed so as to surround the damping member 6. ing.

Further, as a feature of the present invention, both ends 1a of the torsion spring 1 are attached to the outer diameter side and the inner diameter side of FIG.
As shown in enlarged detail in FIG.
2 are each cut out in a semicircular shape. On the other hand, inside the base end 4 of the arm 3 and the cup 5, as shown in FIG.
Two engaging portions 9 and 9 are formed with the convex curved surfaces 8 and 8 facing each other at predetermined intervals in the inner and outer directions orthogonal to the spring mounting direction. Torsion spring 1
Both ends 1a, 1a of the torsion spring 1 are attached to the base end 4 of the arm 3 and the cup 5, respectively, by inserting and engaging the engaging recesses 7, 7.

Thus, in this embodiment, the torsion spring 1
Engaging recesses 7, 7 formed on both ends 1a, 1a of the
Are inserted between the two engaging portions 9 formed inside the base end portion 4 of the arm 3 and the inside of the cup 5 at predetermined intervals in the inner and outer directions orthogonal to the spring mounting direction to engage with each other. Therefore, it is not necessary to project each of the end portions 1a to the outside, and it is possible to prevent interference with surrounding objects.

Further, at the time of mounting, it suffices to insert the engaging concave portions 7, 7 of the respective end portions 1a between the base end portion 4 of the arm 3 and the engaging portions 9, 9 of the cup 5 for engagement. Therefore, each end 1a can be easily attached to the base end 4 of the arm 3 and the cup 5.

Further, it is not necessary to bend each end portion, and therefore the projecting dimension need not be taken into consideration, and the torsion spring 1 can be easily manufactured.

(Second Embodiment) FIGS. 4 and 5 show a second embodiment. In this embodiment, one engaging recess 7 is formed on the outer diameter side of each end 1a of the torsion spring 1. Is. That is, the engagement recess 7 on the inner diameter side is eliminated in the torsion spring 1 of the first embodiment. Along with this, the engagement on the outer diameter side of the two locking portions 9, 9 formed at a predetermined interval in the inner and outer directions orthogonal to the spring mounting direction inside the base end 4 of the arm 3 and inside the cup 5. The concave curved surface 8 is formed only on the outer locking portion 9 corresponding to the fitting recess 7, and the inner locking portion 9 is formed.
Is formed on the flat surface 10.

Therefore, in this embodiment, the same operational effect as that of the first embodiment can be obtained.

On the contrary to the above, one engaging recess 7 may be formed on the inner diameter side of each end 1a of the torsion spring 1,
In this case, the inside of the proximal end portion 4 of the arm 3 and the cup 5
The inner locking portions 9 and 9 may also have the concave curved surface 8 formed only on the inner diameter side locking portion 9, and the outer locking portion 9 may be formed into a flat surface.

In each of the above embodiments, the engaging recess 7 is formed as an engaging portion at each end 1a of the torsion spring 1. However, the invention is not limited to this. For example, the outer diameter of each end 1a of the torsion spring 1 is not limited to this. Side and inner diameter sides are formed with engaging protrusions as engaging portions, and the inside of the base end portion 4 of the arm 3 and the inside of the cup 5 are
A convex curved surface may be formed on each of the locking portions 9, 9. It should be noted that only one engaging protrusion may be formed on the outer diameter side or the inner diameter side of each end portion 1a of the torsion spring 1. In this case, the inside of the base end portion 4 of the arm 3 and the inside of the cup 5 may be formed. Only one of the locking portions 9, 9 has a convex curved surface, and the other locking portion 9 has a flat surface.

[0017]

As described above, according to the present invention,
Since the engaging portions that are inserted into and engage with the two locking portions that are formed inside the two mounting bodies at predetermined intervals in the inner and outer directions orthogonal to the spring mounting direction are formed at both ends of the torsion spring, It is not necessary to project each of the above ends to the outside, and it is possible to prevent interference with surrounding objects. Further, the engaging portions of the respective end portions can be inserted into and engaged with the engaging portions of the respective mounting bodies, so that the respective end portions can be easily attached to the mounting body. Furthermore, the torsion spring can be easily manufactured without bending each end.

[Brief description of drawings]

FIG. 1 is a front view of an automatic tensioner equipped with a torsion spring according to a first embodiment.

FIG. 2 is an enlarged perspective view showing an end portion of the torsion spring according to the first embodiment.

FIG. 3 is an enlarged perspective view showing a mounted state of the torsion spring according to the first embodiment.

FIG. 4 is a view corresponding to FIG. 2 of the second embodiment.

FIG. 5 is a view corresponding to FIG. 3 of the second embodiment.

FIG. 6 is a perspective view of a torsion spring according to a conventional example.

FIG. 7 is a front view of an automatic tensioner equipped with a conventional torsion spring.

[Explanation of symbols]

 1 Torsion Spring 1a End 3 Arm (mounting body) 5 Cup (mounting body) 7 Engagement recess (engagement part) 9 Locking part

Claims (1)

[Claims] 1. A torsion spring having two ends attached to two mounting bodies facing each other, wherein each end has a predetermined spacing inward and outward in a direction perpendicular to a spring mounting direction inside the respective mounting bodies. 2. A torsion spring, wherein an engaging portion is formed between two engaging portions formed by opening the engaging portion to engage with each other.