JP2902261B2 - Directional rotary damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper for giving a free rotation in one direction of an object to be rotated and suppressing the rotation in an opposite direction.

[0002]

2. Description of the Related Art In a conventional damper mechanism of this type, a fluid is sealed in a closed space formed by a fixed portion provided with a convex portion and a blade portion provided on a rotating body, and the rotating body rotates. Utilizing the volume change of the closed space, the rotating fluid is generated by passing the sealed fluid through a narrow gap, thereby achieving the purpose.

[0003]

In the above-mentioned conventional rotary damper, rotational resistance is generated in both directions. Therefore, when a rotational resistance is generated only in one direction, a check valve (check valve) or the like is separately provided to provide a free passage in one direction of the fluid and a suppression passage in the other direction. . However, providing a separate structure such as a check valve not only increases the number of parts, but also complicates assembly and increases manufacturing costs.

[0004]

According to the present invention, there is provided a sealed housing in which a liquid is sealed, a rotary shaft is provided inside the sealed housing, and a convex portion for suppressing the flow of an internal fluid is provided on an inner surface of the sealed housing. The top surface of the convex portion is a sliding surface concentric with the inner wall surface of the housing, and the rotating shaft is formed with a convex portion that slides closely on the inner wall surface of the housing, and the convex portion of the housing is formed. A piece that acts as a spring while sliding on the sliding surface of
This is a directional rotary damper to which a holding blade is attached.

[0005] It is usual to provide a pair of a convex portion on the inner surface of the housing and a convex portion sliding on the inner wall surface of the housing attached to the rotating shaft, but the number of these is set as a set. It does not matter. Further, the housing may be formed in a tubular elongated shape, and the protrusions and blades of the rotating shaft may be formed to have a length corresponding to the inner peripheral surface of the cylindrical housing.

According to the present invention, a cantilever blade is elastically attached to the rotating shaft, and a pressure difference is generated between the convex portion and the sliding surface in the fluid sealed by the rotating force of the external force. When the rotation is one side, the blade is pressed against the convex part by the spring action to close the fluid, and therefore, a reaction force (suppression) is generated in the rotation force. The generated pressure difference pushes the blade against the spring action to create a gap between the blade and the projection, thereby creating a fluid passage and allowing the fluid to rotate freely.
Thus, rotation resistance is generated in one direction.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG.
1 shows an exploded perspective view of the embodiment, 1 is a rotating shaft, 8 is a housing, and the rotating shaft 1 penetrates a side plate 12 of the housing 8 through a shaft hole 13. A side plate 12 ′ is fixed to a surface of the housing 8 opposite to the side plate 12. Then, the housing 8 is kept in a sealed state together with the seal ring 14 provided in the shaft hole 13.
A convex portion 9 is provided on the inner surface of the housing 8. In the case of this embodiment, two are provided. The top surface of the convex portion 9 is a sliding surface 10 having a smooth sliding surface concentric with the inner wall surface 11 of the housing 8.
It has become.

The valve 2 is fixed to an end of the rotary shaft 1 inside the housing 8. The valve section 2 is provided with a blade 4 elastically connected by a spring section 3. On the outer surface of the blade 4,
A smooth sliding surface 5 that slides on the sliding surface 10 of the projection 9 of the housing 8 is formed. The valve portion 2 is provided with a convex portion 6 having a sliding surface 7 that slides in close contact with the inner wall surface 11 of the housing 8 and suppresses the flow of fluid.

A fluid is sealed in the sealed housing 8,
During rotation, the sliding surface 10 comes into contact with the sliding surface 5 of the valve portion 2,
It slides according to the rotation of the rotating shaft 1. Same housing 8
The sliding surface 7 of the valve portion 2 comes into contact with the inner wall surface 11 of the valve member and slides. FIG. 2 is a sectional view showing a state in which the housing 8 and the valve section 2 in FIG. 1 are assembled.

In this embodiment, the spring portion 3 is shown as being processed as an integral structure. However, the spring portion 3 is formed as a separate spring component and embedded in the rotary shaft 1 and the blade 4. Is also good.

FIG. 3 shows another embodiment. This embodiment is equivalent to the previous embodiment in which the valve portion 2 and the housing 8 in FIG. The end shaft 16 is provided with a closing plate 17 having a diameter that can be inserted in accordance with the inner diameter of a cylindrical portion 24 described later.
Is provided with a seal ring 18 so as to be rotatably engaged with the cylindrical portion 24. Behind the closing plate 17, the valve shaft 2
There is provided a key 19 that fits into the zero and transmits torque (torque). The end shafts 16 are provided on both sides with the valve shaft 20 at the center. The valve shaft 20 has the same uniform cross-sectional structure as the valve portion 2 shown in FIG.
Detailed description is omitted. At both ends of the valve shaft 20, there are provided holes 21 into which the keys 19 of the end shaft 16 are fitted. In the valve shaft 20,
Like the valve part 2, a sliding surface 22 with a large diameter and a sliding surface 23 with a small diameter are provided.

The inner surface of the cylindrical portion 24 is formed of a smooth surface so that the sliding surface 25 slides freely on the sliding surface 22 of the valve shaft 20 over the entire length. Also, on the inner wall of the cylindrical portion 24,
The protrusion 26 having the same length as the valve shaft 20 is provided.
The sliding surface 27 of the convex portion 26 that slides with the sliding surface 23 of 0 is finished to a smooth surface.

A support seat 28 is provided to apply a rotational force (torque) to the cylindrical portion 24. In this embodiment, the cylinder 2
4, the one end shaft 16 is inserted into the cylindrical portion 24, and the hole 21 of the valve shaft 20 and the key 19 are fitted to close the end portion. The fluid is injected into the space defined by the valve shaft 20 and finally the hole 21 and the key 19 are fitted, the other end shaft 16 is inserted into the cylindrical portion 24, and the other end is closed. They are assembled.

[0014]

Next, the operation of the present invention will be described with reference to FIGS. The principle by which the suppression effect occurs in rotation can be understood from FIG.

If the rotating shaft 1 is rotated by an external force, the valve 2
Is rotated in the direction of arrow 29. Convex part 6 of valve part 2
Fluid 15a in the space closed by the convex part 9 of the housing 8
Means that the volume is reduced by the rotation of the convex portion 6,
Therefore, the pressure 30 on the side of the fluid 15a is increased, and the pressure 31 of the fluid 15b on the side opposite to the protrusion 9 is decreased. Since a pressure difference is generated in the fluid between the pressure increasing side and the pressure reducing side, the force of the pressure difference is applied to the blade 4, which pushes and expands the blade 4 to press the convex portion 9. The fluid 15a on the pressure increasing side gradually flows toward the pressure reducing side through the space between the blade 4 and the convex portion 9 which are in close contact with each other, and as a result, the rotational force is suppressed as a reaction force.

Next, the operation in the reverse case will be described with reference to FIG. The rotation shaft 1 rotates in the opposite direction, and the valve 2
Let it rotate in the direction of. In this case, the fluid 15a on the pressurized side in the closed space, which has been on the depressurized side, works opposite to the rotation suppression effect shown in FIG. The fluid 15b is on the reduced pressure side, and the fluid 15a presses the blade 4 toward the center,
A gap 33 is formed between the projection 33 and the projection 9.

The liquid 15a flows toward the fluid 15b until the differential pressure disappears, and when the pressure becomes equal, the gap 33 is closed by the urging force of the spring portion 3. If the reverse rotation continues, both fluids 15
The differential pressures a and 15b also continue to exist, and the fluid continues to flow through the gap 33 until the differential pressure disappears. In other words, there is no suppression force acting against the rotation force.

In the above description, it is assumed that the rotating shaft 1 is given a rotating force as an external force, and the casing 2 is fixed.
Conversely, the operation is the same even if the rotating shaft 1 is fixed and a rotating force is applied to the housing 2. However, in this case, the direction of rotation is opposite to the direction in which suppression is applied.

[0019]

According to the present invention, since the blade of the valve portion is opened and closed by the differential pressure of the fluid stored in the housing, the rotational resistance, that is, the rotational resistance having a selectivity in the rotational direction can be suppressed. Further, by providing the valve portion directly on the shaft portion, the total number of components can be reduced and the device can be manufactured at low cost. By connecting the blades of the valve portion with the spring portion, the shaft portion itself can have a valve structure, thereby saving space and making the whole product smaller and slimmer.

[Brief description of the drawings]

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

FIG. 2 is an assembled sectional view of the valve section of FIG. 1;

FIG. 3 is a partially cutaway perspective view of another embodiment.

FIG. 4 is a cross-sectional view illustrating an operation in which rotation suppression occurs.

FIG. 5 is a cross-sectional view illustrating an operation of freedom of rotation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Valve part 3 Spring part 4 Blade 5 Sliding surface 6 Convex part 7 Sliding surface 8 Housing 9 Convex part 10 Sliding surface 11 Inner wall surface 12 Side plate 12 'Side plate 13 Shaft hole 14 Seal ring 15a Fluid 15b Fluid 16 End Shaft 17 Sealing Plate 18 Seal Ring 19 Key 20 Valve Shaft 21 Hole 22 Sliding Surface 23 Sliding Surface 24 Cylindrical Part 25 Sliding Surface 26 Convex 27 Sliding Surface 28 Support Seat 29 Arrow 30 Pressure 31 Pressure 32 Arrow 33 Gap

Claims (1)

(57) [Claims] 1. A closed shaft enclosing a liquid, a rotating shaft inside the sealed housing, and an inner surface of the sealed housing has a convex portion for suppressing a flow of an internal fluid, and a top surface of the convex portion is a housing. The rotating shaft is formed with a sliding surface concentric with the inner wall surface of the housing, and the rotating shaft is formed with a convex portion that slides closely with the inner wall surface of the housing, and slides on the sliding surface of the convex portion of the housing.
A directional rotary damper, comprising a cantilever blade acting as a spring while being mounted.