JPS5920893B2 - shock absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the relative motion between the first member and the second member is different between the relative motion of each member in one direction and the relative motion of each member in the opposite direction. The present invention relates to a shock absorbing device configured to exert a shock absorbing characteristic to provide a shock absorbing effect.

5 For example, it has a first member attached to a moving body and a second member also attached to the moving body so as to be able to move relative to this first member, and the first member In the acceleration detection device 10 configured to detect the acceleration of a moving body by detecting the relative movement between the first member and the second member, there is a gap between the first member and the second member. This prevents each part of the acceleration detection device from being damaged due to sudden and large relative motion, and also prevents the first and second members from being damaged.
1 to absorb unnecessary vibrational movement between the
5. Is it necessary to moderate the relative motion between the first member and the second member?

At this time, the first member and the second member appropriately move relative to each other according to the acceleration generated in the moving body, and the relative movement between the first member and the second member is controlled. The initial direction of movement between the first member and the second member so that the sensing device 20 for sensing can reliably detect the relative movement between the first member and the second member. the damping characteristics of the shock absorber for slowing the relative motion between the first member, the second member, and 25 such that the shock absorbing force is relatively weak against the direction of movement, and the shock absorbing force against the reverse movement direction is relatively strong; It is desirable to define Therefore, the present invention has been developed in response to the demand for a shock absorber having the above-mentioned shock absorbing properties, and in response to the relative motion between the first member and the second member, the It is an object of the present invention to provide a shock absorbing device that exhibits different shock absorbing characteristics during motion and during relative motion in the opposite direction, and which can be manufactured with a simple structure, light weight, and small size.

Hereinafter, a case will be described in which an embodiment of the present invention is applied to a device for calculating the degree of angular deviation for a 35-antis-thread braking device for wheels. First, in FIG.
The wheel hub 6 of C1 is attached to the wheel rotatably supported on the top.
A wheel data star 7 is attached to the frame with bolts 8.

The wheel hub 6 is rotatably supported on the outer circumferential surface of a fixed axle 2 having a through hole 3 in the shaft center via a pair of bearings 4 and 5 separated from each other in the axial direction by spacing members 9 and 10. . On the fixed axle 2, an annular fixed support plate 11 is fitted to the outside of the bearing 5, and a nut opening 3 is screwed to the outside of the fixed support plate 11, and a locking member 12 prevents loosening. A stop has been applied. Therefore, the fixed support plate 11
is securely fixed on the fixed axle 2 by the tightening action of the nut 13. First light emitters 27 are arranged on the outer surface of the fixed support plate 11 so as to be adjacent to each other in the direction of the center line of the wheel 1.
and the second light emitter 28 are attached, and the first light emitter 28 is also attached at a position radially inward from each of the light emitters 27 and 28 so as to be adjacent to each other in the direction of the center line of the wheel 1. A first light receiving body 29 that receives the light emitted by the light emitter 27
and a second light emitting body 28 that receives the light emitted by the second light emitting body 28.
A photoreceptor 30 is attached.

Wiring 31 connected to each light emitter 27, 28 and each photoreceptor 29, 30 is passed through a through hole 3 of fixed axle 2, and connected to a power source or a signal analyzer (not shown). A seal member 14 is interposed between the wheel hub 6 and the spacing member 9, and a seal member 15 is interposed between the wheel hub 6 and the outer peripheral surface of the cylindrical portion of the fixed support plate 11. ing. A casing 16 is fixed to the outer surface of the wheel hub 6 so as to surround the fixed support plate 11 and the light emitters 27 and 28. A rotary support plate 18 is fixed to the inside of the outer wall of the casing 16 by bolts 17. As shown in FIGS. 1 and 2, the outer edges of three leaf springs 19 arranged in a radial direction are fixed on the inner surface of the rotating support plate 18. An annular weight 20 is fixed to the inner edge of each of these leaf springs 19.

On the inner surface of the weight 20, each light emitting body 27, 28
When the proximal edge of the cylindrical outer light shielding plate 21, which is disposed so as to extend into the gap between the light receiving bodies 29 and 30, is fixed, the boss of the rotary support plate 18 At the tip of the part,
Similarly, a cylindrical inner side is arranged to extend within the gap between each of the light emitters 27 and 28 and each of the light receivers 29 and 30, and is located further inward in the radial direction than the cylindrical outer light shielding plate 21. The proximal edge of the light shielding plate 22 is fixed. Cylindrical outer light shielding plate 2
1, a large number of outer first transparent windows 23 for passing light emitted by the first light emitting body 27 are arranged at regular intervals in the circumferential direction, and a second light emitting an outer second transparent window 2 for passing light emitted by the body 28;
4 are arranged in large numbers at regular intervals in the circumferential direction.

Further, in the cylindrical inner light-shielding plate 22, a large number of inner first light-transmitting windows 25 for passing the light emitted by the first light emitter 27 are arranged at regular intervals in the circumferential direction. \
In addition, a large number of inner second light-transmitting windows 26 for passing the light emitted by the second light emitter 28 are arranged at regular intervals in the circumferential direction. In a normal state where the wheel 1 is not experiencing angular acceleration, the outer first transparent window 2
3 is out of phase by a certain amount in one direction when viewed in the circumferential direction with respect to the inner first transparent window 25, and the light emitted from the first light emitting body 27 is blocked midway and becomes the first light receiving window. In addition, the outer second light-transmitting window 24 is out of phase with the inner second light-transmitting window 26 by a certain amount in the opposite direction when viewed in the circumferential direction. Thus, the light emitted from the second light emitter 28 is blocked midway so that it does not reach the second light receiver 30. Thus, when the wheel 1 is rotating at a constant speed, the casing 16 and the rotating support plate 1
8. Since the weights 20 rotate integrally, there is no relative rotation between the cylindrical outer light shielding plate 21 and the cylindrical inner light shielding plate 22. Therefore, at this time, each of the light receiving bodies 29, 30 does not sense the light emitted from each of the light emitters 27 and 28 at all.

Furthermore, when the wheel 1 is accelerated in either direction of rotation, the casing 16 and the rotating support plate 18 always continue to rotate integrally with the wheel 1, but due to the inertial force of the weight 20, they are mutually separated via the leaf spring 19. Since relative rotation occurs between the rotating support plate 18 and the weight 20 which are connected together, relative rotation occurs between the cylindrical outer light shielding plate 21 and the cylindrical inner light shielding plate 22.

At this time, depending on the direction of relative rotation of the cylindrical inner light-shielding plate 22 with respect to the cylindrical outer light-shielding plate 21, the outer first light-transmitting window 23 and the inner first light-transmitting window 25, or the outer second light-transmitting window 24 The light-transmitting windows of one set of the inner second light-transmitting windows 26 overlap with each other, so that one of the light-receiving bodies 29 and 30 faces the light-emitting body 27 or 28. It can sense emitted light. and,
The direction of the angular acceleration of the wheel 1 can be determined by knowing which of the light receptors 29 and 30 senses the light first. In addition, each transparent window 23, 24, 25,
26 are arranged at equal intervals in the circumferential direction, each light receptor 29, 30 senses light intermittently depending on the magnitude of the angular acceleration of the wheel 1; The magnitude of the angular acceleration of the wheel 1 can be determined by the number of times.
As shown in FIGS. 1 to 4, the inner edge of a protruding plate body 32 is fixed to the weight 20 so as to be oriented in the reflection direction between the leaf springs 19. A pair of brackets 35 and 35' are protruded from the rotary support plate 18 at positions that sandwich the plate body 32 from both sides.

A cushioning material 33,
34, each bracket 35, 35
2, shock absorbers A and A' having exactly the same structure are mounted facing each other. Since the buffer bodies A and A/ have the same structure, the buffer body A will be explained in detail below. In FIG. 36 is attached, and the inner circumferential surface of the proximal end of a suction cup-like elastic body 39 is fixed onto the outer circumferential surface of the end of the base member 36 on the protruding plate 32 side.

Further, on the outer circumferential surface of the end of the base member 36 opposite to the protruding plate 32, there is provided an elastic lid 40, which is expandable and deflated and has a bowl-like shape, either directly or through a suitable fixing member.
The proximal edge of is secured. At the end of the orifice 37 on the side of the protruding plate 32, a fluid passing through the orifice 37,
For example, a filter 38 may be attached to purify the air.

Further, an orifice 41 may be provided in the center of the elastic lid 40 in order to adjust the pressure of the fluid passing through the orifice 37. If the orifice 37 has appropriate fluid resistance characteristics, the elastic lid 40 can be omitted. In a normal state where no angular acceleration is occurring in the wheel 1, that is, when the protruding plate 32 is at the intermediate position between the shock absorbers A and A'', the suction cup-like elastic cover 3
The end edges of the end-widening portions 9 are uniformly in slight contact with the plate surface of the protruding plate body 32.

With the above configuration, when angular acceleration occurs in the wheel 1, the action of the spring elasticity of the leaf spring 19 and the inertial force of the weight 20 occurs between the rotating support plate 18 and the weight 20. This causes relative rotation, and the protruding plate body 32 approaches the bracket 35 or moves away from the bracket 35. At this time, the protruding plate body 32 is connected to each buffer body A,
When relative movement is made from the intermediate position between A', that is, the neutral position, to the side of the bracket 35, the suction cup-shaped elastic body 3
Due to the bending action of 9, the fluid inside the suction cup-like elastic body 39 flows out from the peripheral edge of the suction cup-like elastic body 39 and also flows out through the orifice 37.
2 approaches the bracket 35 against a relatively small resistance. Even if the protruding plate body 32 approaches the bracket 35 violently, the cushioning material 33 will remain on the plate surface of the protruding plate body 32.
is applied, the buffering effect of the buffer material 33 and the fluid resistance generated in the orifice 37 cause the protruding plate body
No large impact force is generated between 7 and the buffer body A. Therefore, at this time, the cylindrical outer light shielding plate 21
A relative rotation occurs between the cylindrical inner light shielding plate 22 and the cylindrical inner light shielding plate 22 according to the angular acceleration of the wheel 1, and depending on the magnitude of the relative rotation,
The photoreceptor 29 or 30 can sense the light emitted from the emitter 27 or 28. Furthermore, once the angular acceleration that has once occurred in the wheel 1 is eliminated, the spring elasticity of the leaf spring 19 causes the weight 20 to reverse relative rotation in a direction that eliminates the rotational phase difference with respect to the rotating support plate 18. The plate body 32 tries to separate from the bracket 35.

At this time, the protruding plate body 32 is subjected to a relatively large resistance force due to the adsorption action of the sucker-like elastic body 39 and the fluid resistance generated in the orifice 37, and slowly separates from the bracket 35. Therefore, at this time, the rotational phase difference that once occurred between the cylindrical outer light-shielding plate 21 and the cylindrical inner light-shielding plate 22 is slowly eliminated. The inertial force of the weight 20 prevents a rotational phase difference in the opposite direction from occurring between the cylindrical outer light shielding plate 21 and the cylindrical inner light shielding plate 22. Thus, since the buffer body A and the buffer body A' have exactly the same structure, the angular acceleration of the wheel 1 occurs in either direction of rotation of the light receptors 29, 29, 30 accurately and reliably.

In the above description, the casing 16, the bolt 17, and the rotating support plate 18 are integrated with each other to constitute the first member of the invention, and the weight 20 is the second member of the invention.

As described above, according to the present invention, the buffer body includes a buffer body attached to the side of the first member and a protruding plate body attached to the side of the second member, and the buffer body is attached to the side of the protruding plate body. Since it has a suction cup-like elastic body that expands toward the surface and an orifice for communicating the inside of the suction cup-like elastic body, the first
With respect to the relative movement between the first member and the second member, it is possible to exhibit different damping characteristics when each member moves relative in one direction and in the opposite direction, and the overall As a result, the structure is simple, and a lightweight and compact shock absorber can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of main parts when the shock absorber of the present invention is applied to a wheel angular acceleration detection device, and FIG.
3 is an enlarged view of the main part of FIG. 2, and FIG. 4 is a sectional side view of the main part of the apparatus shown in FIG. 1. 16, 17, 18...first member, 20...
... second member, 32 ... protruding plate body, 35,
35ζ...Bracket, 36...Base member, 37...Orifice, 39...Sucker-shaped elastic body, A...Buffer.

Claims (1)

[Claims] 1 A shock absorber A fixed to brackets 35, 35' integrally protruding from the first members 16, 17, 18, and a second shock absorber A that moves relative to the first members 16, 17, 18. A protruding plate body 32 integrally projects from the member 20 so as to be able to move toward and away from the buffer body A, and the buffer body A includes a base member 36 fixed to the brackets 35 and 35'. , a suction cup-like elastic body 39 is fixed to the base member 36 and widened toward the plate surface of the protruding plate body 32; at least an orifice 31 for communicating a chamber formed inside the suction cup-like elastic body 39 to the outside of the suction cup-like elastic body 39 so as to generate fluid resistance when the suction cup-like elastic body 39 comes into contact with the plate surface of the suction cup-like elastic body 39; Buffer device.