JPH0324332A - Contact type spiral spring - Google Patents

Abstract

PURPOSE:To stabilize noncontacting parts for preventing the occurrence of vibration by magnetizing thin-band shaped spring materials in the width or thickness direction, so that either of both ends of the spring materials in the width direction has the same polarity so as to mutually repel and restrain, while on the other hand, the contacting surfaces of adjacent spring materials have different polarity so at to mutually attract and restrain. CONSTITUTION:On the other circumferential surface of a cover 3 on one side, a ring- shaped permanent magnet 8 the inside of which contacting with the cover 3 has the N-pole, while the outside has the S-pole is provided, and on the outer surface of a cover 4 on the other side, a ring-shaped permanent magnet 9 the inside of which contacting with the cover 4 has the S-pole, while the outside has the N-pole are provided; and they are concentrically fixed respectively. Thereby, in the spring materials 6, S-pole and N-pole are induced at the ends on the cover 3 side, and at the ends on the cover 4 side respectively, so as to be magnetized in the width direction, and either of both ends of the adjacent spring materials 6 has the same polarity, so that a mutually repelling force is produced. Thus, since the spring materials in a spiral spring 5 push to each other so as to be retrained, they are brought in a stable condition, and the occurrence of pulsation in the torque/turn curve or collision noise due to vibration can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATIONS The present invention relates to a spiral spring in which the wires contact each other during unwinding or tightening.

Problems to be solved by the conventional technology and the invention In conventional contact type spiral springs, the non-contact parts that occur during unwinding or tightening are not constrained, so they are unstable and easily generate vibrations, and the torque and number of turns decrease. There are disadvantages in that the +To wire becomes wavy and collision noise occurs, and the torque/turns curve is determined by the dimensions and material of the spiral spring, which cannot be adjusted later.

Means for Solving the Problems The present invention aims to solve these problems by adopting a structure in which a thin cylindrical spring material is magnetized in its width direction or thickness direction.

Functions and Effects of the Invention According to the present invention, when the spring material has the above structure and is magnetized in the width direction, both ends of the adjacent spring materials in the width direction are the same, so they repel each other and restrain each other. , the non-contact parts become stable and the vibration is short and the characteristics become stable, collision noise is controlled, and as they repel each other, the non-contact parts become longer and the slope of the torque/current failure line becomes smaller. At the same time, the contact parts also repel each other and the contact force becomes smaller, which reduces the initial friction force and reduces the hysteresis during tightening and unwinding. When magnetized, the contact surfaces of adjacent spring materials have different polarities, so they attract and restrain each other, and the non-contact parts become stable, making it difficult to generate vibrations and stabilizing the characteristics, reducing collision noise. In addition, since they attract each other, the non-contact portion becomes shorter and the slope of the torque/number of turns+Ib line becomes thicker.

Embodiment FIGS. A contact type spiral spring 5 is formed by winding a thin wire spring material 6 in a spiral shape, and the inner end is attached to the shaft 7 supported at the center of the covers 3 and 4, and the outer end is attached to the inner peripheral surface of the ring 2. Fixed and housed.

Each figure shows a state in the middle of tightening, and adjacent spring materials 6 are in close contact with each other on the outer periphery. As shown in FIG. 3, a ring-shaped permanent magnet 8 is attached to the outer peripheral surface of the cover 3 on one side, with the N pole on the inside contacting the cover 3 and the S pole on the outside.
However, ring-shaped permanent magnets 9 are concentrically fixed to the outer surface of the cover 4 on the other side, and the inner side in contact with the cover 4 has an S pole and the outer side has an N pole. For this reason, the spring material 6 has an S pole on the edge on the cover 3 side, as shown in FIG.
N poles are induced at the side edges and magnetized in the width direction, and both edges of the adjacent spring materials 6 have the same polarity, and forces that repel each other act on them. Therefore, this spiral spring 5 is in a stable state because the spring materials 6 are pressed against each other and restrained, and the torque and number 1111 lines do not pulsate or generate collision noise due to vibrations. In addition, at the boundary between the contact and non-contact parts of the spring material 6, the spring material 6 is separated by mutual repulsive force and the non-contact part becomes longer, so the slope of the torque/turns curve becomes smaller, and the degree of this becomes permanent. It changes depending on the strength of the magnetic force of the magnets 8 and 9, and furthermore, the strength of the adjacent spring materials 6 also changes in the contact area.
They repel each other, reducing the contact pressure, which reduces the thick friction force, which has the advantage of reducing hysteresis during winding and unwinding. In this embodiment, the permanent magnets 8 and 9 are 7[
It may be an i-magnet, or it may be provided only on one side.
Furthermore, it may not be provided over the entire circumference, but may be provided only in a portion.

The second embodiment of the present invention shown in FIGS. 3 to 6 is a case!
As shown in FIG. 6, the ring l2 constituting the ring l is a permanent magnet magnetized so that the outer peripheral surface is a north pole and the inner peripheral surface is a south pole, and is made of a ribbon-shaped spring material made of a magnetic material. The outer end of the contact type spiral spring I5 consisting of l6 is on the inner periphery of ring l2,
The inner ends are respectively fixed to shafts 7 supported by side plates I3 and 14 made of non-magnetic material on both sides. Therefore, as shown in FIG. 6, the spring material 16 is magnetized in the thickness direction with an N pole induced on the outer circumferential surface and an S pole on the inner circumferential surface. 6 {The opposite poles correspond to each other, and a mutually attractive force acts. Therefore, this spiral spring I5 is in a stable state because the spring materials ■6 are attracted to each other and restrained, and the torque/turns curve does not pulsate or collision noise is generated due to vibrations. , at the boundary between the contact and non-contact parts of the spring material I6, the spring materials approach each other due to mutual attraction and the non-contact part becomes shorter, so the gradient of the torque/turns 11l1 line increases, and the degree of this is greater than the ring l2 It changes depending on the strength of the magnetic force. In this example, Ring! 2 may be an electromagnet, and the axis I7 may be magnetized in the radial direction.

In each of the above embodiments, the spring materials 6, 6 were externally magnetized using a permanent magnet or the like, but the spring materials 6,! 6 itself may be made of a ferromagnetic material to form a permanent magnet and magnetized in the width direction or thickness direction.

[Brief explanation of drawings]

Fig. 1 is a plan view of the first embodiment of the present embodiment with the cover removed, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is an enlarged view of a part of Fig. 2, and Fig. 4 The figure is a plan view of the second embodiment with the canopy removed, FIG. 5 is a diagram of FIG. 1, 11: Case 2: Ring 12: Cylinder (permanent magnet) 3, 4, +3, l4: Cover 5, 15: Spiral spring 6, l6: Spring material 7, I7: m 8, 9: Permanent magnet

Claims (1)

[Claims] A contact type spiral spring characterized in that a ribbon-shaped spring material is magnetized in its width direction or thickness direction.