JPH08270703A - Rotary damper - Google Patents

Abstract

PURPOSE: To provide a rotary damper in which its follow-up property is excellent at a high torque, and its directivity can take toward the magnitude of braking action. CONSTITUTION: A housing 1 in which a guide groove 2 is formed along an inner circumference and a step part 3 is formed at an opening end, and a first projection 12 engaged with the guide groove 2 are formed along an outer circumference, and also a second projection 13 is formed along the inner circumference, and a ring collar 11 moved in the shaft direction of the housing 1 and a flange 32 arranged in the center of the shaft direction are watertightly and rotatively attached on the step part 3 by an O-ring 51 and a cap 61. A rotary damper comprises a shaft 31 in which a spiral groove 34 engaged with the second projection 13 is formed along the outer circumference which is passed through the collar 11 and inserted in the housing 1, a coil spring 41 arranged between the bottom of the housing 1 and the collar 11, and by which the collar 11 is energized in the direction of the flange 32, and silicone oil 71 filled in a space consisting of the housing 1 and the flange 32.

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 use in, for example, a Western-style toilet bowl, which brakes the rotational force for rotating a shaft to prevent the toilet lid from rapidly rotating downward.

[0002]

2. Description of the Related Art Various types of conventional rotary dampers have been proposed. Rotating force for rotating a shaft by engaging cams with each other and urging one cam toward the other by a spring. A device that brakes the vehicle in only one direction is known, for example, from Japanese Patent Application Laid-Open No. 6-33966.

[0003]

When the above-mentioned conventional rotary damper is used in, for example, a Western-style toilet bowl and silicon oil that generates a high torque is used as a viscous fluid, the toilet lid is lifted and opened, and immediately closed. When you defeat to make it,
One cam that serves as a piston has poor followability, and the braking action does not work until one cam engages with the other cam by the biasing force of the spring, and the toilet lid suddenly rotates downward. . Therefore, if the viscosity of the silicone oil is reduced in order to improve the followability of one of the cams, the diameter of the orifice has to be reduced, so that there is a disadvantage that a small dust or the like gets stuck in the orifice and does not operate.

The present invention has been made to solve the above-mentioned inconvenience, and has a high torque and a good followability,
It is intended to provide a rotary damper capable of giving directionality to the magnitude of braking.

[0005]

In the rotary damper according to the present invention, a first collar guide portion is formed on the inner periphery and a cylindrical housing having one end opened, and a first collar guide portion engaging with the first collar guide portion. The engaging portion is formed on the outer periphery and the second engaging portion is formed on the inner periphery, and the ring-shaped collar that moves in the axial direction of the housing and the flange that is provided midway in the axial direction of the housing form the housing. A shaft, which is rotatably mounted in a watertight manner in the opening, has a second collar guide portion that engages with the second engagement portion on the outer periphery that penetrates the collar and is inserted into the housing, the housing, and the flange. The first color guide part and the second color guide part are formed in a spiral shape, and the first color guide part and the second color guide part are formed. The other is the shaft of the housing It is obtained by forming the row. And
A spring may be provided to bias the collar in one direction of the axis of the housing.

[0006]

The operation of the rotary damper according to the present invention is
The color guide part is a guide groove parallel to the axis of the housing, the first engaging part is a first protrusion, the second engaging part is a second protrusion, and the second color guide part is a spiral groove. The case where silicone oil is used and the gap between the inner peripheral surface of the housing and the outer peripheral surface of the collar is made to function as an orifice will be described.

First, when the shaft is rotated so as to move the collar from the opening side to the bottom side of the housing or from the bottom side to the opening side, the second protrusion engages with the spiral groove and the first protrusion with the guide groove. Since the is engaged, the collar does not rotate,
Move from the opening of the housing to the bottom side. At this time, since the silicone oil passes through the gap between the inner peripheral surface of the housing and the outer peripheral surface of the collar, the rotational force that rotates the shaft is braked.

When a spring for urging the collar in one direction of the axis of the housing is provided, the rotational force of the shaft for moving the collar from the opening side of the housing to the bottom side and the collar opening from the bottom side of the housing. There is a difference between the urging force of the spring and the rotational force of the shaft moved to the side.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing components of a rotary damper according to a first embodiment of the present invention, FIG. 2 is an external view showing a state in which the components shown in FIG. 1 are assembled into a rotary damper, and FIG. (B) is a partially cutaway sectional view for explaining the operation of the first embodiment.

In these drawings, reference numeral 1 denotes a housing, which is composed of a bottomed cylindrical body with one end open. Then, a guide groove 2 as a linear first color guide portion that extends from the opening end side to the bottom on the inner circumference and is parallel to the axis of the housing 1.
Are formed so as to face each other in diameter, a step portion 3 into which a flange 32 of a shaft 31 described later is rotatably fitted is formed on the inner circumference of the opening end, and a cap described below is formed on the outer circumference on the opening end side. The engaging claw 4 with which the engaging portion 63 of 61 is engaged,
There are multiple.

Reference numeral 11 denotes a ring-shaped collar which is housed in the housing 1, and is a cylinder having a first projection 12 as a first engaging portion which engages with the guide groove 2 of the housing 1 in a fitted state on the outer circumference. Cylindrical second projections 13 are provided as opposed to each other on the diameter of the surface, and are provided on the inner surface of the cylindrical surface as a second engaging portion that engages with the spiral groove 34 of the shaft 31 in a fitted state. There is.

Reference numeral 31 denotes a shaft, and a flange 32 that is rotatably fitted to the step portion 3 of the housing 1 is provided in the middle of the axial length direction, that is, in the center portion, and the collar 11
The outer periphery that is inserted into the housing 1 through the second
Spiral groove 3 as second collar guide with which projection 13 engages
4 are formed. In addition, on the outer peripheral edge of the flange 32,
A circular step portion 33 is formed.

Reference numeral 41 denotes a coil spring, which is provided between the inner periphery of the housing 1 and the outer periphery of the shaft 31 inserted into the housing 1, and between the bottom of the housing 1 and the collar 11 so as to dispose the collar 11 on the shaft. It is arranged so as to urge toward the flange 32 of 31. Reference numeral 51 denotes an O-ring, which is housed in the space formed by the housing 1, the step portion 33 provided on the flange 32 of the shaft 31, and the cap 61, and makes the flange 32 rotatable with respect to the housing 1. The space between the housing 1 and the flange 32 is watertightly sealed.

Reference numeral 61 denotes a cap, in which a hole 62 through which the shaft 31 rotatably passes is formed, and as many engaging portions 63 as the engaging claws 4 of the housing 1 are provided. Reference numeral 71 denotes silicon oil as a viscous fluid, which is filled in the space formed by the housing 1 and the flange 32 of the shaft 31.

A and B indicate chambers, the chamber A is a space formed by the housing 1 and the collar 11, and the chamber B is a space formed by the housing 1, the collar 11 and the flange 32. The gap between the inner peripheral surface of the housing 1 and the outer peripheral surface of the collar 11 functions as an orifice.

Next, an example of assembly will be described. First, the coil spring 41 is inserted into the housing 1 with the open end facing upward, and then the housing 1 is filled with a predetermined amount of silicone oil 71. Then, the O-ring 51 is attached to the step portion 33 of the flange 32 provided on the shaft 31.
After installing the second protrusion 13 of the collar 11 to the spiral groove 3
4 and the collar 11 is brought into contact with the flange 32.

In this way, the first projection 12 of the collar 11 that is in contact with the flange 32 is made to correspond to the guide groove 2, the spiral groove 34 side of the shaft 31 is inserted into the housing 1, and the collar 11 is coiled. Place it on the spring 41. In this state, the shaft 31 is passed through the hole 62,
With the engaging portion 63 corresponding to the locking claw 4, the cap 6
When 1 is pressed against the housing 1 side against the urging force of the coil spring 41, the first projection 12 fits in the guide groove 2 and the engaging portion 63 engages with the locking claw 4, so that FIG.
And as shown in FIG. 3A, it can be assembled.

Next, the operation will be described. It should be noted that the housing 1 is fixed to a predetermined member, and a door, a lid, and the like are attached to a portion of the shaft 31 protruding from the housing 1. First, in the state shown in FIG. 3A, when the shaft 31 is rotated in the arrow X direction, the second protrusion 13 engages with the spiral groove 34, and the first protrusion 12 enters into the guide groove 2.
Is engaged with the collar 11, the collar 11 has a coil spring 4
It moves to the bottom side of the housing 1 against the biasing force of 1 without rotating.

When the collar 11 moves in this way, the chamber A
The silicone oil 71 inside flows into the chamber B through the gap between the inner peripheral surface of the housing 1 and the outer peripheral surface of the collar 11,
Since the flow resistance acts on the silicone oil 71, the rotational force that rotates the shaft 31 is braked, and the state shown in FIG. Therefore, the rotational force that rotates the shaft 31 in the X direction can be braked.

Further, in the state shown in FIG. 3B, when the shaft 31 is rotated in the direction of the arrow Y, the second protrusion 13 is engaged with the spiral groove 34 and the first protrusion 12 is engaged with the guide groove 2. Therefore, the collar 11 moves from the bottom side of the housing 1 to the opening side without rotating. Therefore, similarly, the rotational force that rotates the shaft 31 in the Y direction can be braked.

However, when the shaft 31 is rotated in the Y direction, since the collar 11 is urged toward the flange 32 by the coil spring 41, the urging force of the coil spring 41 is added to the rotational force for rotating the shaft 31. The braking of the rotational force is weakened by an amount corresponding to the biasing force of the coil spring 41.

As described above, according to the first embodiment of the present invention, the second projection 13 is engaged with the spiral groove 34, and the guide groove 2 is formed.
Since the first projection 12 is engaged with, even if the viscosity of the silicone oil 71 is increased in order to generate high torque, high torque and followability are obtained. And color 11
Since the coil spring 41 for urging the coil spring 41 is disposed, braking of the rotational force that moves the collar 11 in the urging direction of the coil spring 41 can be weakened according to the urging force of the coil spring 41, and thus the shaft 31 It is possible to give direction to the magnitude of braking of the rotational force that rotates the.

FIG. 4 is a perspective view showing components of a rotary damper according to a second embodiment of the present invention, and FIGS. 5 (a) and 5 (b).
6 is a partially cutaway sectional view for explaining the operation of the second embodiment, and the same parts as those in FIGS. In these figures, 1A indicates a housing, which is composed of a bottomed cylindrical body with one end open. Then, the spiral groove 2 as the first color guide portion is provided on the inner circumference.
A is formed, a step portion 3 is formed on the inner circumference of the opening end, and a plurality of locking claws 4 are provided on the outer circumference on the opening end side.

Reference numeral 11A denotes a ring-shaped collar housed in the housing 1A, a recess 12A for rotatably positioning a steel ball 21 described later is formed on the outer circumference, and a shaft 31A described later on the inner peripheral cylindrical surface. The protrusion 13A is provided as a second engaging portion that engages with the guide groove 34A in the fitted state. Reference numeral 21 denotes a steel ball as a spherical body, which is engaged with the spiral groove 2A of the housing 1A in a fitted state while being positioned in the recess 12A of the collar 11A. The recess 12A and the steel ball 21 form a first engaging portion.

Reference numeral 31A designates a shaft, a flange 32 is provided at a central portion in the axial direction, and a protrusion 13A is engaged with the outer periphery which is inserted into the housing 1A through the collar 11A in a fitted state. A guide groove 34A that is parallel to the axis of the housing 1A as a color guide portion is formed. As mentioned above, the parts that do not explain the configuration are
This is the same part as in FIGS.

Next, an example of assembly will be described. First, after inserting the coil spring 41 into the housing 1A with the open end facing upward, a predetermined amount of silicone oil 71 is filled into the housing 1A. Then, after the O-ring 51 is attached to the step portion 33 of the flange 32 provided on the shaft 31A, the protrusion 13A of the collar 11A is fitted into the guide groove 34A, and the collar 11A is brought into contact with the flange 32.

In this way, the recess 12A of the collar 11A abutting on the flange 32 is made to correspond to the spiral groove 2A, the guide groove 34A side of the shaft 31A is inserted into the housing 1A, and the collar 11A is inserted into the coil spring 41.
Place on top. In this state, the shaft 31A is inserted into the hole 62.
When the cap 61 is pressed against the urging force of the coil spring 41 to the housing 1A side while the steel ball 21 is positioned in the recess 12A and the engaging portion 63 corresponds to the locking claw 4, Since the steel ball 21 fits into the spiral groove 2A and the engaging portion 63 engages with the locking claw 4, it can be assembled as shown in FIG. 5 (a).

Next, the operation will be described. The housing 1A is fixed to a predetermined member, and a door, a lid, and the like are attached to a portion of the shaft 31A protruding from the housing 1A. First, in the state shown in FIG. 5A, when the shaft 31A is rotated in the arrow X direction, the projection 13A engages with the guide groove 34A and the steel ball 21 engages with the spiral groove 2A. 11A moves to the bottom side of the housing 1A while rotating against the biasing force of the coil spring 41.

When the collar 11A moves in this way, the silicone oil 71 in the chamber A flows into the chamber B through the gap between the inner peripheral surface of the housing 1A and the outer peripheral surface of the collar 11A. Because distribution resistance acts,
The rotation force that rotates the shaft 31A is braked to
The state shown in FIG. Therefore, the shaft 31A
It is possible to brake the rotational force that rotates the X in the X direction.

Further, when the shaft 31A is rotated in the direction of the arrow Y in the state shown in FIG. 5B, the guide groove 34
Since the projection 13A is engaged with A and the steel ball 21 is engaged with the spiral groove 2A, the collar 11A moves while rotating from the bottom side of the housing 1A to the opening side. Therefore, similarly, the rotational force that rotates the shaft 31A in the Y direction can be braked.

As described above, also in the second embodiment of the present invention, the same effect as in the first embodiment can be obtained. Since the first engaging portion is composed of the recess 12A of the collar 11 and the steel ball 21, the rolling resistance of the steel ball 21 reduces frictional resistance, which allows smooth operation and strength of the collar 11A. Can be lowered.

In the above embodiment, the housing 1,
The gap between the inner peripheral surface of 1A and the outer peripheral surfaces of the collars 11 and 11A was made to function as an orifice. The gap between the inner peripheral surface of the collars 11 and 11A and the outer peripheral surfaces of the shafts 31 and 31A, the guide groove 2 or the spiral groove. 2A and first protrusion 12 or recess 12A
Gap between the second protrusion 13 or the protrusion 13A and the spiral groove 34
Alternatively, the gap with the guide groove 34A can also function as an orifice. The first color guide portion and the second color guide portion are grooves, and the first engagement portion and the second engagement portion are protrusions. However, the first color guide portion and the second color guide portion have been described. Can also be formed by a ridge, and the first engaging portion and the second engaging portion can also function as grooves.

Further, although the example in which the spherical body is the steel ball 21 has been described, it goes without saying that the spherical body may be made of another material. Further, although the example in which the coil spring 41 is arranged between the bottom of the housing 1, 1A and the collar 11, 11A has been described, the collar 11, 11A and the flange 32 are described.
A coil spring 41 is provided between the collar 11,
It goes without saying that 11A may be biased toward the bottom side of the housing 1, 1A. Although the silicone oil 71 has been described as an example of a viscous fluid, it goes without saying that another viscous fluid may be used.

[0034]

As described above, according to the present invention, the first collar guiding portion of the housing is engaged with the first engaging portion of the collar, and the second collar guiding portion of the shaft is engaged with the second collar. Since the parts are engaged with each other, even if the viscosity of the viscous fluid is increased to generate high torque, high torque and followability are obtained. Since the spring for urging the collar in one direction of the axis of the housing is arranged, braking of the rotational force for moving the collar in the urging direction of the spring can be weakened according to the urging force of the spring. It is possible to give direction to the magnitude of braking of the rotational force that rotates the shaft.

[Brief description of drawings]

FIG. 1 is a perspective view showing components of a rotary damper which is a first embodiment of the present invention.

FIG. 2 is an external view of a state in which the components shown in FIG. 1 are assembled into a rotary damper.

3 (a) and 3 (b) are partially cutaway sectional views for explaining the operation of the first embodiment.

FIG. 4 is a perspective view showing components of a rotary damper which is a second embodiment of the present invention.

5 (a) and 5 (b) are partially cutaway sectional views for explaining the operation of the second embodiment.

[Explanation of symbols]

 1, 1A Housing 2 Guide groove 2A Spiral groove 3 Step portion 4 Locking claw 11, 11A Collar 12 First protrusion 12A Recess 13 Second protrusion 13A Protrusion 21 Steel ball 31, 31A Shaft 32 Flange 33 Step portion 34 Spiral groove 34A Guide Groove 41 Coil spring 51 O-ring 61 Cap 62 Hole 63 Engaging portion 71 Silicon oil

Claims (2)

[Claims] 1. A cylindrical housing having a first collar guide portion formed on the inner periphery and one end open, and a first engagement portion engaging with the first collar guide portion formed on the outer periphery. A second engaging portion is formed on the inner circumference, and a ring-shaped collar that moves in the axial direction of the housing and a flange provided in the middle of the axial length are watertightly rotatably attached to the opening of the housing. A shaft having a second collar guide portion that engages with the second engagement portion on an outer periphery that is inserted into the housing through the collar, and the housing and the flange. A viscous fluid filled in a space, one of the first color guide portion and the second color guide portion is formed in a spiral shape, and the first color guide portion and the second color guide portion are formed. The other is the housing Axis and are formed in parallel, the rotary damper, characterized in that. 2. The rotary damper according to claim 1, further comprising a spring for urging the collar in one direction of an axis of the housing.