JPH06185559A - Included angle damping device - Google Patents

Abstract

PURPOSE:To produce a powerful damping effect by suppressing vibration of a spring, in a simple damping device using the spring. CONSTITUTION:A working shaft 20 rotatable around a cylinder shaft and axially movable is incorporated in a cylinder type hollow chamber 11 formed in a casing 10, and the casing 10 forms the fixed side and the working shaft 20 forms the rotation side (the input side). A spring 30 twisted through rotation of the working shaft 20 has one end fixed to the casing 10 and the other end to rotary shaft 20. An annular resistance member 40 brought into contact with the inner peripheral surface 12 of the hollow chamber 11 to generate resistance is fixed to the working shaft 20. A rotation force exerted on the twist spring 30 is rapidly damped through resilient deformation of the spring and frictional resistance provided by the resistance member 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a narrow-angle damping device having a simple structure, which damps a rotational force acting on an operating shaft.

[0002]

2. Description of the Related Art Dampers for damping rotational torque include
Conventionally, there is one that utilizes the elasticity of a coiled spring. With this damper, a rotational force is applied in the direction in which the coil is twisted, and the torsion absorbs the rotational force and reaches a stop.However, the elasticity of the spring causes a reaction force, which is repeated and the spring vibrates. However, it is not suitable for absorbing impact force. Dampers that do not use springs are also known, in which case the rotational force is absorbed by friction or viscous resistance. For this reason, a damping action is exerted in both the left and right rotation directions, so that it cannot be used when a damping force is expected only for rotation in one direction.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points. The object of the present invention is to rapidly damp vibrations without causing vibration even when a shocking torque is exerted. It is possible to obtain a damping effect for rotation in one direction at the same time.

[0004]

In order to solve the above-mentioned problems, the present invention is directed to a casing 10 in which a hollow cylindrical chamber 11 is formed, and a hollow shaft 11 which is inserted into the hollow chamber 11 and around a cylindrical axis in the inserted state. Is arranged between the casing 10 and the operating shaft 20, and the operating shaft 20 is rotatable about the same and is movable in the coaxial direction. One end is the casing 10 and the other end is the operating shaft 20.
A torsion spring 30 which is fixed to the torsion shaft 30 and is twisted by the turning force of the actuating shaft 20 when the actuating shaft 20 is turned, and acts in a direction to stop the turning.
A ring-shaped resistance member made of an elastic material, which is fixed to the actuating shaft 20 and whose outer periphery contacts the inner peripheral surface 12 of the hollow chamber 11 to generate frictional resistance and absorb the turning force received by the torsion spring 30. With 40, a narrow-angle damping effect can be obtained.

The narrow angle means that the rotation angle from the time when the rotational force acts on the operating shaft 20 to the time when it stops is limited to a narrow range, and does not mean a specific angle. Absent.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given below with reference to the drawings. 1 and 2 relate to a first embodiment of the device according to the present invention, which has a casing 10 in which a cylindrical hollow chamber 11 is formed so as to penetrate through a central portion thereof. Hollow chamber 1
1 is an inner diameter in which a torsion spring 30 described later mainly fits,
The size thereof is set so that the spring 30 and the resistance member 40 can be arranged side by side. Cylindrical casing 10
A bearing portion 13 is provided at one end of the, and a fixing portion 14 in the direction of the cylinder axis (reference numeral O in FIG. 4) is provided on the side surface in a plate shape. Such a casing 10 can be formed by molding a suitable resin or metal.

The operating shaft 20 is a shaft-shaped member which is inserted into the hollow chamber 11 and is rotatable about the cylindrical axis O and coaxially movable in the inserted state. One end 2 of the operating shaft 20
1 is borne by the bearing portion 13, and the other end portion 22 is borne similarly by the other end opening portion 15 having the same diameter as the hollow portion 11, and a spring 30 to be described later is provided between them. The resistance members 40 are arranged side by side in the axial direction. That is, the small diameter shaft portion 23 on the one end portion 21 side of the operating shaft 20 and the inner peripheral surface 12 of the hollow chamber 11
A torsion spring 30 is housed between the two, and one or two or more circumferential grooves 24 are provided in the large diameter portion of the actuating shaft 20 on the other end 22 side, and the resistance member 40 is housed therein.

Further, the actuating shaft 20 has an input shaft 25 at one end for giving the actuating shaft 20 a turning force for rotating the actuating shaft 20.
The input shaft 25 of the first embodiment is integrally formed coaxially with the actuating shaft 20, and has a male engaging portion 26 for transmitting rotational power.
Have. This may be the female engagement portion 27 as illustrated. 28 is an input means that can be engaged with the engaging portion 26,
One is shown as a lever and the other as a gear. Of course, the input means 28 is not limited to these.

The above-mentioned torsion spring 30 is a coil spring arranged so as to be wound around the small diameter portion 23 of the operating shaft 20. The one end 31 is the bearing portion 1 of the casing 10.
3 to the locking portion 33, and the other end 32 to the operating shaft 2
They are fixed by being locked to the locking portions 34 provided on the large diameter portion of 0, respectively. The number of coils wound and the thickness of the torsion spring 30 are set so that a sufficient spring strength can be obtained to damp the expected turning force at a narrow turning angle.

The resistance members 40 are fitted and mounted in the grooves 24 provided in the thick shaft portion of the operating shaft 20, respectively. The illustrated resistance member 40 is composed of two O-rings that elastically contact the inner peripheral surface 12 of the hollow chamber 11 to generate resistance. As the resistance member 40, a packing ring may be used instead of the 0-ring, and a viscous body exhibiting viscous resistance can be applied to the 0-ring and the packing ring.

In the apparatus according to the present invention thus constructed, the operating shaft 20 is assembled in the hollow chamber 11 of the casing 10 together with the torsion spring 30 and the resistance member 40, and the one end 21 is formed.
It is assembled by screwing the stopper 42 into the hole 41 formed in the. Now, the casing 10 is fixed, and the rotating member 50 represented by an open / close lid is attached to the input shaft 25 so that the torsion spring 30 is in a neutral state with the lid shown by the solid line in FIG. At this time, if the end portion 32 of the torsion spring 30 on the rotation side is located at the position A in FIG. 4, the end portion 32 is moved to the position as the operating shaft 20 is rotated rightward to close the rotation member 50. Rotate to B by θ degrees and stop. That is, during this period, the torsion spring 30 is twisted by receiving the turning force, thereby absorbing the turning force and at the same time accumulating the force, and the resistance member 40 presses against the inner peripheral surface 12 to apply resistance, so that no reaction occurs when stopped. , Strong damping effect is obtained. The above operation is the same when the operating shaft 20 is rotated counterclockwise.

Next, a second embodiment will be described with reference to FIGS. In this example, the input shaft provided at the end of the actuating shaft 20 has the minimum necessary size, and the lever 50 is engaged with the male engaging portion 26 (of course, the female engaging portion 27).
It has a structure that is attached by the engagement hole which is 9, and the length can be minimized. Mounting base 5 for lever 50
Reference numeral 1 also serves as a member that closes one opening 15 of the hollow chamber 11, and a flange-shaped portion that is provided at the other end of the hollow chamber 11 at the end of the operating shaft 20 and has a diameter larger than that of the shaft. 52
Is locked. 53 is a void containing the same portion 52, 54
Is a screw hole formed at the end of the operating shaft engaging portion 26, into which the set screw 55 of the lever 50 is screwed. Further, the fixing portion 14 of this example is integrally formed in a flange shape at the end portion of the casing. 56 is a fixed side and 57 is a set screw.

Another structure of the second embodiment, that is, the bearing 1
The ratio of the thick shaft portion 21 'borne by 3 to the total length of the working shaft is long, and the working shaft 20, the torsion spring 30, and the resistance member 40 incorporated in the hollow chamber 11 have the opposite positional relationship to the above embodiment. Since the others are the same, the reference numerals are used and the detailed description is omitted. Note that the viscous body that exhibits viscous resistance can be used as the resistance member 40 in the same manner as in the above embodiment. In the case of the second embodiment, since it can be constructed in a small tubular shape having a short overall length and a simple shape, it can be used as a substitute for a bearing fitting or the like, and the operation is exactly the same as in the case of the first embodiment.

[0014]

Since the present invention is constructed and operates as described above, when a rotational force is applied to the operating shaft 20, the torsion spring 30 elastically deforms to absorb the rotational force, and at the same time, the operating shaft 20. The resistance member 40 arranged side by side absorbs the turning force by elastically contacting and sliding on the hollow chamber inner peripheral surface 12 of the casing 10, so that the twisting force is twisted even when the turning force is shocked. A rapid damping effect is achieved without causing the spring 30 to vibrate. In particular, by applying a turning force from the neutral point of the torsion spring 30,
A damping effect can be obtained in the turning direction, and at the same time, the damping effect can be obtained in only one direction because the resistance is returned and rotated in the opposite direction with less resistance.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a damping device according to the present invention.

FIG. 2 is a vertical sectional view of the above.

FIG. 3 is a side view for explaining a usage state of the same apparatus.

FIG. 4 is a transverse cross-sectional view for explaining the action, taken along line VI-VI in FIG.

FIG. 5 is a longitudinal sectional view showing a second embodiment of the device of the present invention.

FIG. 6 is an exploded perspective view of the above.

Claims (3)

[Claims] 1. A casing 10 having a cylindrical hollow chamber 11 formed therein, and an operating shaft 20 which is inserted into the hollow chamber 11 and is rotatable about a cylindrical axis and movable coaxially in the inserted state. , Which is disposed between the casing 10 and the operating shaft 20, one end of which is the casing 10 and the other end of which is the operating shaft 2.
A torsion spring 30 that is fixed to 0 and twists when the actuating shaft 20 is turned and receives a turning force to act to stop the turning.
And a ring-shaped elastic material that is fixed to the operating shaft 20 and that has an outer periphery that contacts the inner peripheral surface 12 of the hollow chamber 11 to generate frictional resistance and that absorbs the rotational force received by the torsion spring 30. A narrow-angle damping device constituted by the resistance member 40. 2. The torsion spring 30 is a coil spring arranged so as to be wound around the operating shaft 20, one end 31 of which is fixed to the casing 10 and the other end 32 of which is fixed to the operating shaft 20 by locking. Then, when the spring 30 stores a force by the turning force applied to the spring 30 in its neutral state to return the operating shaft 20 to the origin, the stored force can be added to the return force to reduce the return torque, The narrow-angle damping device according to claim 1, wherein the damping effect works only in one direction. 3. The narrow-angle damping device according to claim 1, wherein the resistance member 40 is an O-ring or a packing ring, and a viscous body exhibiting viscous resistance is applied to its contact surface.