JPH0134768Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a tension coil spring attachment device.

B. Prior Art Conventionally, tension coil springs used in prime movers and the like are required to satisfy the spring characteristics and have durability against vibration. Conventionally, in a coil spring that is simply made by winding a wire into a coil, the coil spring vibrates greatly due to vibrations generated from a prime mover, etc., and lacks durability against vibrations. Therefore, conventionally, as shown in FIG.
As shown in Publication No. 43380, a bellows-shaped rubber boot is inserted into the main body of a coil spring, or a damper clip is inserted into the main body of a coil spring as shown in Japanese Utility Model Publication No. 48-6108. When the coil spring is tensioned and installed, for example, as shown in FIG. 2, the vibration prevention member 2 etc. exhibits a damper effect to suppress the vibration of the coil spring and improve the durability against vibration. It is something. However, when using the rubber vibration prevention member 2 and boots as described above, they tend to deteriorate and break more quickly than the coil springs, so if you do not notice the damage, the damaged item may be attached to the coil spring wire. They have the disadvantage that they dig into the metal space and impede the spring characteristics, or that vibrations cannot be suppressed and the coil spring itself breaks, resulting in deterioration of the functions of the machinery, etc. in which it is used. In addition, providing the vibration prevention member 2, rubber boots, and tamper clip in this way requires manufacturing these parts separately from the coil spring, and requires installation work, which increases the cost of the coil spring. . Furthermore, the locking hooks 3 and 4 at both ends of the conventional coil spring are
The hook-forming surface in the free state where no tensile force is applied as shown in FIG. 1 is the same surface as the hook-forming surface in the installed state as shown in FIG. Since the coil spring is formed on a surface that cannot be twisted in the coil direction, as shown in Fig. 2,
For example, when installed between the stay 5 and lever 6,
The locking hooks 3 and 4 lock in the locking hole 7 as shown by the dotted lines in FIG. It has the disadvantage that it easily slides in the vertical direction as shown in the figure, accelerating wear and tear.

C. Purpose of the invention In view of the above, the present invention provides durability against vibrations and the above-mentioned vibration prevention member 2 by simply changing the formation state of the locking hook of the coil spring without using a damper such as the conventional vibration prevention member 2. It is an object of the present invention to propose a tension coil spring mounting device that reduces wear and tear as described above, and that can be manufactured at low cost by not using a damper as described above.

D. Structure of the invention In order to achieve the above-mentioned object, the present invention provides a tensioning coil spring having locking hooks formed at both ends thereof, which is placed between two opposing mounting members by inserting the hooks into the locking holes provided in the members. The locking holes 7, 7 of both mounting members are
, so that when a coil spring is installed in the holes 7, 7, a twist is given to the spring,
The locking holes 7, 7 are arranged so that their axes face in the same direction, and both locking hooks in the free state of the coil spring are formed so that their forming surfaces intersect with each other, so that the coil spring can be held in both directions. By installing the coil between mounting members, a twist can be given to the coil.

E. Embodiment Next, an embodiment of the present invention shown in FIGS. 3 to 5 will be described. Reference numeral 8 denotes the main body of a tension coil spring, which is wound into a coil as is well known.
Reference numerals 9 and 10 indicate locking hooks formed by extending and bending the wire forming the main body portion 8 to both ends. Both locking hooks 9 and 10 are formed such that the hook-forming surfaces in a free state where no tensile force is applied are out of phase in the coil winding direction from the hook-forming surfaces in the attached state. That is, in the embodiment shown in FIGS. 3 and 4, both locking hooks are connected so that the formed surface A-A of one locking hook 9 is orthogonal to the formed surface B-B of the other locking hook 10. When the locking hooks 9 and 10 are formed, and the coil spring is attached, as shown in FIG.
The coil spring is twisted and installed between the stay 5 and the lever 6 so that the levers B are placed on the same plane. In this embodiment, θ is set so that both forming surfaces A-A and B-B of both locking hooks 9 and 10 have a twist angle of 90 degrees with respect to each other at the time of installation. The angle θ is such that when both the locking hooks 9 and 10 are installed, the end edge 7 of the locking hole 7 in the coil winding direction, as shown by the solid line in FIG.
a, 7a, and the corresponding contact force is set to generate a restoring force that prevents the two locking hooks 9, 10 from easily sliding in the coil winding direction. do it. Generally, it is desirable that this angle θ is 30° or more to ensure that a torsional force is generated, taking into account errors in the mounting conditions of the stay 5 and lever 6.

F. Effect As described above, in order to mount the tension coil spring mounting device as shown in FIG. It is inserted into and engaged with the locking holes 7, 7 facing toward (parallel to). In this case, since the locking hooks 9 and 10 are out of phase by 90 degrees, the coil will be twisted. As a result, both the locking hooks 9 and 10 can be attached to the main body 8.
As shown by the solid line in FIG. 6, both edges 7 of the locking hole 7 in the coil winding direction are
a, 7a so as to be pressed against and locked. Since a torsional force is applied to the main body portion 8 of the coil spring mounted in this manner, the stress amplitude is alleviated. The measurement results of this stress amplitude are shown in FIG. This measurement shows the stress amplitude when the vibration frequency is changed while the vibration acceleration is constant, and the characteristic A is the coil spring according to the present invention. Under the same conditions, the stress amplitude of the conventional coil spring without a damper showed a value as shown in characteristic B, and the stress amplitude of the coil spring with a conventional damper showed a value as shown in characteristic C. The measurement results show that the coil spring of the present invention can alleviate stress amplitude in the same way as a conventional coil spring with a damper. In addition, in a coil spring with a conventional damper, the peak frequency of its stress amplitude is low, and when this coil spring is used in an automobile engine, it is constantly used in this frequency (rotation speed) range during operation. However, the coil spring of the present invention solves this problem. Moreover, since both locking hooks 9 and 10 are pressed against the locking hole 7 by the end edge 7a in the coil winding direction when they are installed,
Sliding due to coil spring vibration is reduced,
As a result, damage due to sliding friction is reduced and durability is improved. The amount of wear due to this sliding friction is
As a result of measurement under the measurement conditions shown in FIG. 7, the values shown in FIG. 8 were obtained. This eighth
A in the figure shows the wear amount of the coil spring of this invention.
B shows the amount of wear of a coil spring without a conventional damper, and C shows the amount of wear of a coil spring with a conventional damper. This result shows that the amount of wear of the coil spring of the present invention is small.

Effects of the invention As described above, according to the invention, compared to conventional coil springs without dampers, stress vibration is alleviated and the amount of wear on the locking hooks 9 and 10 is reduced, thereby improving durability. can be achieved. Moreover, compared to a conventional coil spring with a damper, it is possible to reduce the amount of wear on the locking hooks 9 and 10 and improve durability. By simply forming the locking hook forming surfaces to cross each other and arranging the locking holes 7, 7 so that their axes face in the same direction, it can be mounted without changing the spring characteristics of the main body. Stress amplitude can be alleviated in the same way as a coil spring with a damper. Therefore, there is no need to manufacture or install a damper as in the past, making it possible to manufacture it at a low cost. Furthermore, damage to the damper can prevent the spring characteristics from being affected. It has features that are not available.

[Brief explanation of drawings]

Fig. 1 is a side view of a conventional tension coil spring with a damper, Fig. 2 is a side view showing its installed state, Fig. 3 is a side view of a tension coil spring used in the device of the present invention, and Fig. 4 is a side view of a tension coil spring with a conventional damper. 5 is a side view showing the installation state, FIG. 6 is a sectional view showing the device of the present invention, FIG. 7 is a characteristic diagram showing the measurement results of stress amplitude with respect to vibration frequency, and FIG. 8 is a wear diagram. FIG. 5, 6...stay and lever that are mounting members, 7
... Locking hole, 8 ... Main body of coil spring,
9, 10... Locking hook, A-A, B-B...
Hook forming surface.

Claims (1)

[Scope of utility model registration request] A tension coil spring having locking hooks formed at both ends is installed between two opposing mounting members by inserting the hooks into locking holes provided in the members, wherein both the mounting members The locking holes 7, 7 are arranged so that their axes face in the same direction so that when a coil spring is installed in the holes 7, 7, a twist is given to the spring. At the same time, both of the locking hooks in the free state of the coil spring are formed so that their formed surfaces intersect with each other, and the coil spring is installed between the two mounting members to give a twist to the coil. Coil spring mounting device.