JPH0510357A - Spring constant-adjustable spring - Google Patents

Abstract

PURPOSE:To adjust the magnitude of the spring constant by adjusting the fitting angle of a plate spring. CONSTITUTION:A linear guide 1 is provided at the tip of a plate spring 3 via a shaft 2, and a shaft 4 is integrally provided at the root of the plate spring 3 and supported by a bearing 5. The shaft 4 is connected to an actuator 6, and the angle of the plate spring 3 is adjusted. The linear guide 1 is connected to a structure or a machine to support the plate spring 3. When the angle of the plate spring 3 against the moving direction of the structure is adjusted, the spring constant can be adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring device used for vibration damping and shock absorbing devices such as structures or machines, in which the magnitude of the spring constant can be arbitrarily adjusted. When performing vibration isolation and vibration isolation for structures and machines, it is possible to always adjust the spring constant optimally, because resonance is avoided and force transmission is reduced even if the operating conditions change.

[0002]

2. Description of the Related Art Conventionally, in a structure or machine that is spring-supported for the purpose of vibration isolation, if the frequency of the exciting force and the natural frequency of the excitation force match due to changes in the mass or shape, or changes in the operating conditions, Excessive force may be transmitted or resonance may occur, causing trouble or damage to the use of structures or machines. In order to avoid this, it is necessary to adjust the spring constant, but for a general spring made of metal or rubber, the spring constant is determined by the material, shape, and dimensions, and once set, the spring constant is adjusted. It is impossible to do. As an example of a device that can adjust the spring constant,
The air spring can change the spring constant by adjusting the internal pressure, but the adjustment range is narrow and delicate adjustment is not possible, and it is composed of a complicated device such as a compressor. ， Limited to cases where the use range is special.

[0003]

SUMMARY OF THE INVENTION The present invention is intended to develop a device capable of continuously and instantaneously adjusting a spring constant in a wide range.

[0004]

[Means for Solving the Problems] The structure will now be described with reference to the drawings. (A) The linear guide 1 is provided at the tip of the leaf spring 3 via the shaft 2. (B) The shaft 4 is integrally provided at the base of the leaf spring 3. (C) The shaft 4 is supported by the bearing 5. (D) Connect the actuator 6 to the shaft 4. (E) Connect the linear guide 1 to the mass 7 that corresponds to the structure or machine. The apparatus is operated as described above.

[0005]

Since the present invention has the above-mentioned structure, its operation will be described. It is composed of a guide rail and a moving block in order to spring-support the mass 7 moving in the direction of arrow a as shown in FIG. Connect the guide rail of the linear guide 1 to the mass 7. The moving block of the linear guide 1 is capable of relative linear motion in the guide rail direction, but is constrained in the direction perpendicular to the rail. Therefore, the linear guide 1
When the tip of the leaf spring 3 is attached to the moving block of 2 through the shaft 2, the tip of the leaf spring 3 and the mass 7 move integrally in the direction of movement of the mass 7 indicated by the arrow a, and are perpendicular to this. It enables relative movement in the direction of arrow b. further,
The moving block of the linear guide 1 and the leaf spring 3 are constructed so that they can rotate relative to the shaft 2. Further, it is convenient if the connecting portion between the linear guide 1 and the shaft 2 or the connecting portion between the shaft 2 and the leaf spring 3 is allowed to relatively linearly move in the axial direction, because an unreasonable force is not applied in the axial direction. ．
When the mass 7 moves from the rest position in the direction of arrow a, the leaf spring 3
Of the leaf spring 3 is moved together in the direction of arrow a, but the root of the leaf spring 3 is supported by the bearing 5 via the shaft 4, and therefore does not move.
The leaf spring 3 elastically deforms to generate a restoring force and acts as a spring. Since the leaf spring 3 has an elongated rectangular cross section as shown in Fig. 3, it is easily deformed in the thickness direction and is not easily deformed in the width direction. Therefore, when the leaf spring 3 is oriented as shown in Fig. 3, the restoring force is the smallest and therefore the spring constant is the smallest. FIG. 4 shows the state of FIG.
Shows the state where is rotated 90 degrees. In this case, since the leaf spring 3 is hardly deformed in the direction of arrow a, the restoring force is almost infinite and the spring constant is almost infinite. FIG. 5 shows an intermediate state between FIG. 3 and FIG. 4, in which the leaf spring 3 maintains an angle of θ with respect to the direction of arrow b. In this case, the action of the linear guide 1 allows the mass 7 and the tip of the leaf spring 3 to move relative to each other in the direction of the arrow b.
When the mass 7 moves in the direction of arrow a, the leaf spring 3 is deformed in the direction of arrow c, and the component of the restoring force of the leaf spring in the direction of arrow a is in the state between FIG. 3 and FIG. As a result, when the angle θ of the leaf spring is changed from 0 degree to 90 degrees, the spring constant can be continuously adjusted from the minimum state as shown in FIG. 3 to the almost infinite state as shown in FIG. Is. Moreover, the spring constant can be changed subtly by adjusting the angle θ subtly. Furthermore, by adjusting the angle θ using an actuator, the spring constant can be instantaneously and continuously changed.

[0006]

EXAMPLES The following can be carried out in implementing the present invention. (B) As the actuator, a servo motor, a step motor or an electromagnetic solenoid can be considered. (B) The effect is the same when the bearing 5 is connected to the mass 7 and the guide rail of the linear guide 1 is fixed on the support side. (C) Instead of the linear guide 1, the link mechanism 8 or the plate spring 9 can achieve the purpose. (D) If the leaf spring 3 is thin, even if the base of the leaf spring 3 is rotated, the tip may not rotate because the leaf spring 3 is twisted. To avoid this, instead of the leaf spring 3, the leaf springs 10 and 11 are held in parallel by the spacers 12 and 13 to achieve the purpose. (E) The purpose of the leaf spring 3 can also be achieved by a structure in which a general spring 15 and a linear guide 16 are provided in the frame 14. The operation of the linear guide 1
6 is linearly movable relative to the frame 14 in the direction of arrow d, and the linear guides 1 and 16 are rotatable relative to the shaft 2. When the linear guide 1 moves in the direction of arrow a, the spring 15 expands and contracts, and the restoring force is generated in the direction of arrow d. On the other hand, since the movement direction (arrow d) of the linear guide 16 is changed by rotating the shaft 4 integrated with the frame 14, the component of the magnitude of the restoring force with respect to the direction of the arrow a is changed and the arrow a is changed. This means that the magnitude of the spring constant in the direction of has changed. The linear guide 16 can have the same function even if it has the same structure as the link mechanism 8 or the leaf spring 9. (F) There is also a method of manually adjusting the angle θ of the leaf spring in the actuator 6 by using the knob 17 or the screw head 18. (G) When the angle θ of the leaf spring 3 is adjusted using an actuator, the optimum spring constant for constantly suppressing the vibration is measured while the vibration state of the mass 7 is measured by the displacement sensor or the like using the control device. It is also possible to control so that. As a control device, it is possible to create a dedicated electronic circuit or use a microcomputer.

[0007]

According to this method, when a structure or machine is supported by a spring to suppress vibration or transmission force, the operating frequency changes and the natural frequency changes, or the vibration frequency of the exciting force changes. Even if the frequency is close to the frequency, it is possible to always adjust to the optimum spring constant so as to avoid resonance and minimize the transmitted force.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a perspective view of use of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a sectional view taken along line AA of FIG.

5 is a sectional view taken along line AA of FIG.

FIG. 6 is a partial view of another embodiment of the present invention.

FIG. 7 is a partial view of another embodiment of the present invention.

FIG. 8 is a partial view of another embodiment of the present invention.

FIG. 9 is a partial view of another embodiment of the present invention.

FIG. 10 is a partial view of another embodiment of the present invention.

FIG. 11 is a partial view of another embodiment of the present invention.

[Explanation of symbols]

1 is a linear guide 2 is a shaft 3 is a leaf spring 4 is a shaft 5 is a bearing 6 is an actuator 7 is a structure or a machine which is supported by this apparatus 8 is a mass 8 is a link mechanism 9 is a leaf spring 10 is a leaf spring 11 is a leaf Spring 12 Spacer 13 Spacer 14 Frame 15 Spring 16 Linear guide 17 Knob 18 Screw head

Claims (7)

[Claims] 1. A linear guide 1 is provided at the tip of a leaf spring 3 via a shaft 2. (B) A shaft 4 is provided at the base of the leaf spring 3 and supported by a bearing 5. (C) Connect the actuator 6 to the shaft 4. A spring constant adjustable spring configured as described above. 2. A spring constant adjustable spring according to claim 1, wherein the linear guide 1 is a link mechanism 8. 3. The linear guide 1 is a leaf spring 9 as claimed in claim 1.
Spring constant adjustable spring. 4. A spring constant adjustable spring according to claim 1, 2 or 3, wherein the leaf spring 3 comprises leaf springs 10 and 11 and spacers 12 and 13. 5. The spring constant adjustable spring according to claim 1, wherein the leaf spring 3 comprises a frame 14, a spring 15 and a linear guide 16. 6. A spring constant adjustable spring according to claim 1, 2, 3, 4, 5, wherein the actuator 6 can be manually adjusted. 7. A spring constant adjustable spring according to claim 1, 2, 3, 4, 5, wherein the spring constant is optimally adjusted by a control device.