JPS6056936B2 - non-contact spiral spring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wind regulator for an automobile.

As is clear from its use, this spiral spring is a non-contact type spiral spring with hooks formed at the inner and outer ends (a term opposite to the contact type spiral spring "wind-up spring").
It is. This type of spring has a small installation space, so the design stress is high, and its lifespan has been a problem.

In addition, during operation, contact between the plates occurs, causing a large difference in torque between pressurization and depressurization, and the actual stress is greatly increased compared to the design stress, causing accidents such as early breakage, and friction noise. It had drawbacks such as emitting . This means that the conventional spiral spring
It is made by winding a steel band, and the degree of processing is different between the inner coil turn and the outer coil turn, and when considering each turn separately, the outer turn of the coil has a smaller spring constant than the inner turn. This is because That is, when the spiral spring is rotated, the pitch of the outer turns tends to come into close contact faster than the pitch of the inner turns. Also, from the perspective of the degree of machining, the moment of inertia of the outer turn is smaller than that of the inner turn (the cross-sectional shape of the inner turn is more arcuate than that of the outer turn), and the spring constant is lower. It's getting smaller. This invention was made based on the above circumstances, and all coil turns are deflected almost uniformly, eliminating contact between plates of a spiral spring, reducing hysteresis in torque characteristics, and improving durability. The present invention aims to provide a spiral spring with a structure that reduces the generation of abnormal noise.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

The spiral spring 1 of the embodiment shown in FIGS. 1 and 2 has a cross section 2 perpendicular to the longitudinal direction of the spiral spring so that the moment of inertia of the spiral spring increases as it moves outward from the coil center of the spiral spring. The size and shape are set.
In particular, in this embodiment, the cross section 2 is a rectangular cross section with equal thickness and a width that gradually increases in the longitudinal direction of the spiral spring 1. For this reason, as shown in the solid line in Figure 3, the relationship between torque and deflection angle is different from that of the conventional one (dotted line).
Rather, it becomes linear during pressurization.
In addition, in the embodiment shown in FIG. 4, although the size of the cross section 2 is the same, that of the inner coil turn is almost rectangular, whereas that of the outer coil turn is of the same thickness and circular. Curved in an arc-spiral splay is shown.

This spiral spring 1 has a greater degree of processing on the inside than on the outside, so when a steel strip curved in an arc in a direction perpendicular to the longitudinal direction is formed into a spiral shape, the cross section of the inner coil turn becomes as shown in the figure. It returns to a rectangular shape, and the outer coil turns take on an arcuate cross-section close to the initial state. In short, in this invention, the size and shape of the cross section perpendicular to the longitudinal direction of the spiral spring are set so that the moment of inertia of the area gradually increases as the coil center of the spiral spring moves outward. Since the deflection angle of each part on the inside and outside of the spring approaches a constant value, each coil from the inside coil to the outside coil of the spiral spring Since they come into close contact almost simultaneously, there is no large difference in torque, the actual stress is not applied much wider than the design stress, it can be used within the tolerance, durability is maintained, and there is no friction noise. You can get the effect.

[Brief explanation of the drawing]

Fig. 1 is a front view of a spiral spring showing one embodiment of the present invention, Fig. 2 is a longitudinal side view, Fig. 3 is a characteristic diagram of deflection angle and torque, and Fig. 4 is a longitudinal cross-section of another embodiment. FIG.

Claims (1)

[Scope of Claims] 1. A cross section perpendicular to the longitudinal direction of the spiral spring such that the moment of inertia of the non-contact type spiral spring with hooks formed at the inner and outer ends gradually increases as it moves outward from the coil center. A non-contact spiral spring characterized in that the size and shape of the spiral spring are set such that the angle of deflection of each part is constant on the inside and outside of the spiral spring. 2. The non-contact type spiral spring according to claim 1, characterized in that the width of the cross section perpendicular to the longitudinal direction of the spiral spring gradually increases as the width moves outward from the coil center of the spiral spring. . 3. A cross section perpendicular to the longitudinal direction of the spiral spring has the same cross-sectional area, and the cross-sectional shape is formed in such a shape that the cross-sectional moment of inertia gradually increases as the cross-sectional shape moves outward from the coil center of the spiral spring. Claim 1
Non-contact type spiral spring as described in Section 1. 4. The non-contact type spiral spring according to claim 3, wherein the cross-sectional shape is curved in an arc so that the outer surface of the turn of the spiral spring is concave.