JPH06294430A - Directional rotary damper - Google Patents

Abstract

PURPOSE:To provide a small rotary damper, for which precision parts are not required, and the manufacturing cost of which in terms of quality is low. CONSTITUTION:In a directional rotary damper, a wedge body 7 is provided on the outer periphery of a drive disc 6, and a driven part 2 to be abutted on the wedge body is provided. Rotational force is transmitted by the pressure of the wedge body 7 sandwiched between the drive disc 6 and the driven part 2 in one direction, while rotational force is not transmitted at all by the wedge body 7 but escapes against a spring 8 held thereby in the reverse direction. A sliding disk 14 integrated into the driven part 2 or a sliding cylinder is rotated by the rotational force transmitted to the driven part 2, and rotational brake is carried out by the fluid resistance of a liquid of high viscosity, which is provided in the sliding cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper that gives free rotation in one direction of an object to be rotated but restrains rotation in the opposite direction.

[0002]

2. Description of the Related Art In a conventional damper mechanism of this type, a rotating sliding plate or a shaft outer peripheral sliding face is brought into contact with a fixed side sliding plate or in-cylinder sliding face, and a high viscosity is provided in the gap. It was intended to enclose a fluid and generate a rotational reaction force (resistive force) due to viscous friction to obtain its purpose.

A rotary reaction force is generated bidirectionally in such a rotary damper.

When the rotational reaction force is generated only in one direction, the rotary input shaft and the rotary sliding plate are connected by a ratchet wheel so as to have selectivity in the rotational direction.

Alternatively, when the rotation is changed to a linear movement through a rack and pinion mechanism and a compression spring is provided at the tip of the rotation to rotate in the direction of pushing the spring, a rotational reaction force is generated together with the viscous frictional force, and rotation in the opposite direction is generated. In the case of 1, the pseudo-selectivity for the rotation direction is provided by using the method of canceling the viscous frictional force by utilizing the reaction force of the compressed spring.

[0006] However, according to these methods, a precise mechanical element such as a ratchet wheel or a rack and pinion mechanism is required to be used, so that the entire apparatus becomes large and it cannot be housed in a compact size. Therefore, in order to secure the accuracy, the manufacturing cost and quality have been increased.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary damper which is relatively small in size and low in manufacturing cost.

[0008]

Therefore, in the present invention, a method for selecting the unidirectionality of rotation is obtained by a simple device utilizing frictional resistance, and the structure thereof is claimed. It is a rotary damper as described in.

That is, a wedge-shaped small piece is inserted between the rotating body and the sub-rotating body, and the small piece abuts and presses both the rotating body and the sub-rotating body over a large area. The load per area is made small, and the small piece forms an integral structure with the rotating body via a spring, and when the rotating body rotates in the direction of riding on the wedge-shaped small piece, the pressing force is increased to follow the frictional force. Transmitting rotational force (torque) to the rotating body, and when rotating in the opposite direction, disengages the rotating body from the wedge-shaped small piece and slides the small piece so that the rotational force is not transmitted to the sub-rotating body. The rotational force transmitted to the driven rotor in a directional manner is generated by a frictional force or a viscous liquid to generate a rotational reaction force.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The selection and control method will be described in more detail below with reference to the drawings.

FIG. 1 shows an exploded perspective view of a directional rotary damper according to the present invention.

The drive shaft portion 1 is fitted in the driven portion 2, and the portions 1 and 2 are incorporated in the casing portion 3 and sealed by the lid 4.

The driving unit 1 obtains a rotational driving force which is an external force from the input shaft 5. The input shaft 5 and the drive plate 6 are integrally formed, and a plurality of wedge bodies 7 are arranged on the outer periphery of the drive plate 6, and the wedge bodies 7 are connected by a spring portion 8. The outer peripheral surface 9 of the wedge body 7 is the same as the shaft center of the input shaft 5, and is finished in a perfect circle. Drive plate 6
The contact surface 10 between the wedge body 7 and the wedge body 7 has an acute angle, and has a shape formed by bending a wedge body that develops on a straight line and has a slope on the circumference.

In the driven portion 2, the inner surface 12 forms a perfect circle, and the wedge body 7
The cylindrical portion 11 slidable on the outer peripheral surface 9 and the side moving plate 13 form an integral structure. The sliding disk 14 is connected to the side moving plate 13 and rotates with the rotation of the side moving plate 13. The sliding disk 14 has sliding surfaces 15 on both sides thereof.

The casing portion 3 is an outer cylinder portion 16 for accommodating the driven portion 2.
And the inner plate 17 of the integral mechanism, and the outer plate 18 is screwably engaged with the outer plate 18. A seal portion 19 is provided on the inner diameter surface of the inner plate 17. The other surface 20 of the inner side plate 17 and the inner surface 21 of the outer side plate 18 sandwich the sliding disc 14, and a viscous liquid is enclosed in these surfaces 20, 21. Reference numeral 22 is a female screw for fixing the outer plate 18, but after adjusting the screw connection, other means such as welding or adhesion may be used.

The lid 4 has a hole 23 through which the input shaft 5 is exposed,
The end of the shaft 5 is taken out and connected to the rear casing 3. The method of joining may be any means such as fastening or welding.

FIG. 2 shows another embodiment.

In this example, the sliding portion is elongated in a cylindrical shape.

The drive shaft portion 1 is the same as that of the embodiment shown in FIG.

The driven part 2 has the same structure as in FIG.
Instead of the sliding disk 14 shown in FIG. 1, a sliding shaft 24 is extended rearward and provided integrally.

The sliding shaft 24 may be formed integrally with the driven portion 2 or may be fixed to the driven portion.

The number of enclosures of 3 in FIG. 2 is basically the same as that of 3 in FIG. 1, but a sliding cylinder 25 corresponding to the sliding shaft 24 is provided.
Is provided.

The sliding cylinder 25 may be formed integrally with the housing portion 3 or may be fixed to each other after being separately manufactured.

Between the sliding shaft 24 and the inner surface 26 of the sliding cylinder,
A highly viscous liquid is enclosed. The lid 4 has the same structure as that of the embodiment of FIG. 1, and the operation will be described.

FIG. 3 is a front view of the drive shaft portion 1 and the driven portion 2 assembled together.

Now, when the drive plate 6 is rotated in the direction of arrow 27, the contact portion 10 pushes the wedge body 7 in the rotation direction. Even if the wedge body 7 moves outward, it has the inner surface 12 of the tubular portion 11 of the driven portion 2 and cannot move, so that the contact portion 10 and the inner surface 12 are pinched, the frictional force increases, and the drive shaft The rotational force received from the drive plate 6 of the portion 1 is given to the cylindrical portion 11 of the driven portion 2 and transmitted.

The operation in the case of reverse rotation is shown in FIG. When the rotational force 28 in the opposite direction is applied, the contact portion 10 separates from the wedge body 7,
The wedge body 7 connected to the spring 8 lightly touches the inner surface 12 of the driven portion 2 and rotates together with the drive plate 6. However, the rotational force is not transmitted to the tubular portion of the driven portion 2. Also, the sliding disk 14 in FIG.
The rotating force is braked by using the sliding shaft 24 shown in FIG. 2, and the rotating force is lightly rotated or has a resistant rotation depending on the directionality.

[0028]

EFFECTS OF THE INVENTION With the above-described structure, the wedge body 7 is provided between the drive shaft portion 1 which is a rotating body and the driven portion 2 which is a driven rotating body. On the other hand, the rotational force in only one direction can be transmitted.

Then, it becomes possible to apply a resistance force to the rotation only with respect to the transmitted unidirectional rotation force.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention,

[FIG. 2] Same as above

FIG. 3 is an explanatory view of a rotational force transmission action in each of the above-described embodiments,

FIG. 4 Same as above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive shaft part 5 Input shaft 6 Drive shaft 7 Wedge body 8 Spring part 9 Outer peripheral surface 10 Contact part 27 Rotation direction (drive transmission direction) 28 Rotation direction (non-transmission direction) 2 Driven shaft part 11 Cylindrical part 12 Inner surface 13 Sliding Moving plate 14 Sliding disk 15 Sliding surface 24 Sliding shaft 3 Case part 16 Outer cylinder part 17 Circular side plate 18 Outer plate 19 Seal part 20 Other surface 21 Inner surface 22 Set screw 25 Sliding cylinder 26 Sliding cylinder inner surface 4 Lid 23 Input shaft extraction hole

Claims (1)

[Claims] 1. A drive body is provided with a wedge body on the outer periphery thereof, and a driven portion is provided so as to abut against the wedge body. In one direction, a rotational force is generated by sandwiching the wedge body between the drive disc and the driven portion. In the opposite direction, the wedge body escapes against the holding spring and does not transmit the rotational force at all, and the rotational force transmitted to the driven portion is
A directional rotary damper characterized by rotating a sliding disk or a sliding cylinder integrated with a driven part and receiving a flow resistance of a viscous liquid incidental thereto to perform rotational braking.