JPH0681967B2 - One way damper - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way damper that is provided in association with a member that makes rotational movement and is used for damping rotational speed and torque.

(Prior Art) It is known that the torque is reduced to zero or increased depending on the direction of rotation, but these are configured by combining a rack and pinion system or a ratchet system with another mechanism. ing.

(Technical problem) However, this makes the mechanism large and complicated. Further, there arises a problem that the variation of the torque is large, the torque varies depending on the rotation speed, or the smoothness of the operation is lost.

The object of the present invention is to solve the above problems and the like, there is little variation even for high torque, and the speed dependence of torque is small,
It is to provide a one-way damper that can obtain smooth rotation, and can be structurally simple and compact in design.

(Technical Means) The object is to have a rotating shaft at the center, hold a plurality of rotors arranged in the circumferential direction in contact with the outer peripheral surface thereof, and insert the rotor between the bearing surface and the shaft. A one-way clutch having an outer ring provided with a spring to be engaged, a friction ring having the outer ring fitted and a tapered friction surface formed on the outer periphery, a casing rotatably bearing the friction ring, and a casing. It is reached by a configuration including a pad that is in contact with the inner surface of the friction member and the friction surface, is movable in the axial direction, and is not rotatable about the axis, and an elastic member that pushes the pad in the friction direction with the friction wheel. be able to.

(Example) Hereinafter, description will be given with reference to the drawings. The illustrated one is a one-way clutch 10 having a rotating shaft 1 located at the center and an outer peripheral surface 2 thereof.
A plurality of roller-shaped rollers 3 arranged in contact with
An intermediate member 7 provided with a plurality of polygonal columnar holding pieces 6 having a holding groove 4 for holding them so as to be capable of advancing and retreating in the circumferential direction, a housing groove containing a spring 5 for biasing each trochanter 2 around an axis, An outer ring 8 having a polygonal center hole into which the holding piece 6 is fitted is used. Since the trochanter 3 is pushed by the spring 5 in the biting direction between the outer peripheral surface 2 and the inclined wall 9 of the outer ring center hole, the rotation of the rotary shaft 1 in the same direction is transmitted to the outer ring 8. Reverse rotation slips. The one-way clutch 10 has the same structure as that disclosed in, for example, Japanese Utility Model Publication No. 61-11541, and a one-way clutch manufactured by the applicant company can be used.

The one-way clutch 10 is inserted into the hollow accommodating portion 12 of the friction wheel 11, and includes the engaging groove 13 formed in the outer surface axial direction of the intermediate member 7 and the outer ring 8 and the protrusion 14 of the accommodating portion 12. The engagement causes the friction wheel 11 to rotate integrally in any direction. The outer peripheral surface 15 of the friction wheel 11 is a tapered surface that tapers in the direction of an end opening 17 of the casing 20 described later, and the stepped base portion engages with a through hole 18 provided in the casing 20. ing. Reference numeral 19 denotes a seal ring such as a rolling ring provided on the engaging surface.

An inversely tapered space is formed between the inner surface 16 of the casing 20 and the outer peripheral surface 15 of the friction wheel 11, and a pad 22 having an inversely tapered inner surface 21 is interposed therein. The illustrated pad 22 is divided into three parts. The pad 22 has an engaging groove 23 in the axial direction on the outer periphery, and since the protrusion 24 that engages with this is formed on the inner surface of the casing 20, it can move in the axial direction, but it does not move around the axis. It cannot rotate and slips when the friction wheel 11 rotates. Grease or other lubricant R is applied to the contact surfaces 15 and 21. Further, a pool for holding the lubricant R on the outer peripheral surface 15 of the friction wheel 11 and the inner surface 21 of the pad 22.
30 may be provided. Each surface is shown in FIG. 4 and FIG.
15 and 21 are provided in a concave shape and can be adjusted to optimize the damper effect determined by the balance between the rotation speed and the torque.

A radial multi-leg spring is arranged at the other end of the pad 22 as an elastic member 25 to give an appropriate pressure contact force to the friction surface.
Is positionably incorporated by a cap 28 formed with a male screw 27 that is screwed into an inner screw portion 26 of the opening 17 of the casing 20.

(Operation) In the above-described configuration, when the rotary shaft 1 is rotated in a certain direction (for example, left rotation in FIG. 3), the rotational force of the rotary shaft 1 is coupled by the roller-shaped rotor 3 to form the outer ring. 8 is transmitted to the friction wheel 11 engaged with the engaging groove 13 and the projection 14, and is transmitted to the pad 22 in contact with the tapered outer peripheral surface 15.

At this time, the inner surface 21 of the pad 22 is rubbed by the elastic member 25.
If the casing 20 is pressed against the outer peripheral surface 15 and the rotational torque of the casing 20 is within the range of the transmission torque determined by the area of the friction surface, the friction coefficient, the pressure contact force, etc., the rotational force of the rotating shaft 1 is the casing 20. Is transmitted to rotate in the same direction.

However, when the force acting on the casing 20 is large and exceeds the transmission torque of the friction surface, relative movement, that is, slippage occurs between the friction wheel 11 and the pad 22, so that 1: 1 power transmission cannot be performed. At the time of such relative movement, since the lubricant is present on the friction surface, the influence of wear is eliminated, and high torque and smooth operation are realized.

When the rotating direction of the rotating shaft 1 is opposite, it is processed by the one-way clutch 10, so that further rotation is not transmitted.

(Effect) Since the present invention is configured as described above, a one-way damper can be formed very easily and rationally by using an existing one-way clutch, the variation in torque is small, the speed dependency is small, and the life is long. Can be significantly extended and has a remarkable effect such as smooth rotation.

[Brief description of drawings]

The drawings show an embodiment of a one-way damper according to the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a sectional view, FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIG. Inside view,
FIG. 5 is a side view of the friction wheel and shows an example of installation of a lubricating oil sump. 1 ... Rotation axis, 2 ... its outer peripheral surface, 3 ... Rotor, 10 ...
One-way clutch, 11 …… Friction wheel, 15 …… Outer peripheral surface, 21 ……
Inner surface, 22 ... Pad, 25 ... Elastic member.

Claims (3)

[Claims] 1. A spring, which has a rotating shaft at its center, holds a plurality of rotors arranged in the circumferential direction in contact with the outer peripheral surface of the rotating shaft, and holds the rotor between the bearing surface and the shaft. A one-way clutch having an outer ring provided, a friction wheel in which the outer ring is fitted and a tapered friction surface is formed on the outer periphery, a casing rotatably bearing the friction ring, and an inner surface of the casing and the friction. A one-way damper comprising a pad that is in contact with a surface, is movable in the axial direction, and is not rotatable around the axis, and an elastic member that pushes the pad in the direction of friction with the friction wheel. 2. The one-way damper according to claim 1, further comprising adjusting means for changing the pressing force of the elastic member. 3. The one-way damper according to claim 1, wherein a lubricant reservoir is provided on one or both contact surfaces of the friction wheel and the pad.