JPH06241259A - Rotary damper - Google Patents

Abstract

PURPOSE:To facilitate manufacturing and assembling and raise damping force even if the diameter is enlarged and the axial length is elongated by connecting two caps at both ends by a stirrer stirring granules in a cylinder case. CONSTITUTION:A stirrer 6 is an elliptic cylinder 11. Caps 2 and 3 are provided with oval projecting shafts 12 and 13 trushing into respective ends of the elliptic cylinder 11 on two opposed surfaces, fitting these projecting shafts 12, 13 in respective ends of the cylinder 11 and thereby they are connected to each other. This elliptic cylinder 11 is made of stainless steel, by way of example, and the major axis is little shorter than an inner diameter of a cylinder case 1. When this cylinder case 1 is fixed, and torque is transmitted to either of these caps 2, 3, the elliptic cylinder 11 and the cap on one side try to rotate as one body, so at this time, since the elliptic cylinder 11 has to stir granules 4 compactly filled up in the case 1, the transferred torque is thus damped. Accordingly, a stirrer 6 for damping this transferred torque merely stirs the granules 4, whereby a clearance between this stirrer 6 and the cylinder case 1 is allowed to be large enough.

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 opening and closing a lid, for braking a rotational force based on its own weight and a spring acting to open the lid to quietly open the lid.

[0002]

2. Description of the Related Art As a rotary damper, a viscous fluid such as silicone oil and a rotor are housed in a hermetically sealed housing, and the rotational force is transmitted to the rotor shaft protruding outside the housing. Oil type dampers that are braked by a rotating rotor have been known in the past.

[0003]

The conventional oil type rotary damper described above requires a clearance between the rotor and the housing to be 0.2 mm or less. Therefore, high precision is required for manufacturing the rotor and the housing. It is required and difficult to manufacture, and it takes time to inject viscous fluid. Also, in order to obtain a large braking force, it is necessary to increase the diameter of the rotor and the housing, which requires a space for installation,
The size and thickness of the equipment used are limited.

[0004]

The present invention was developed in order to solve the above-mentioned problems, and the rotary damper of the present invention fills the inside of a cylindrical case with granules and It is characterized in that both ends are closed by rotatable caps, and the caps at both ends are connected by a stirrer for stirring the granules in the cylindrical case. Further, in order to increase the braking force, it is preferable to fill the cylindrical case with a viscous fluid in addition to the particles.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In each of the illustrated embodiments, 1 is a cylindrical case,
2 and 3 are rotatable caps that close each end of the cylindrical case, and 4 and 5 are granules and viscous fluid filled in the cylindrical case,
6 connects the caps 2 and 3, and in the cylindrical case, with the granules,
The agitator which agitates a viscous fluid is shown. The cylindrical case 1 has an engaging recess 1'at one end for fixing to a device to be used. The caps 2 and 3 have an annular groove on the outer circumference, and an O-ring 7 is fitted in the groove. When the caps 2 and 3 are pushed into the respective ends of the cylindrical case and fitted, the O-rings 7 of both caps are fitted into the annular holding grooves 8 provided on the inner circumference of the respective ends of the cylindrical case. As a result, the caps 2 and 3 are rotatably held at each end of the cylindrical case without coming off the cylindrical case, and at the same time, the particles 4 and the viscous fluid 5 are prevented from leaking to the outside. The cylindrical case, cap, and agitator may be made of metal or plastic. The particles have a particle size of 0.2-1.
The alumina beads and the viscous fluid of about 0 mm are, for example, silicone oil. Granules do not impregnate viscous fluids. It should be noted that the caps 2 and 3 are provided with oval-shaped recesses 9 at their end portions so as to receive the rotational force. Good.

The stirring member 6 of the first embodiment shown in FIGS. 1, 2 and 3 is an elliptic cylinder 11. The caps 2 and 3 have elliptical protruding shafts 1 that project into the respective ends of the elliptic cylinder 11 on the surfaces facing each other.
Reference numerals 2 and 13 are provided, and the protruding shafts are fitted and connected to the respective ends of the elliptic cylinder 11. The elliptic cylinder 11 is made of stainless steel, for example, and its major axis is slightly shorter than the inner diameter of the cylindrical case. When the cylindrical case 1 is fixed and the rotational force is transmitted to either one of the caps 2 and 3, the elliptic cylinder 11 and the other cap try to rotate integrally, and at that time, the elliptic cylinder 11 is filled with a lot of gas. Since the granules 4 have to be agitated, the transmitted rotational force is braked.

The stirrer 6 of the second embodiment shown in FIGS. 4 and 5 is a plurality of eccentrically mounted caps 2 and 3,
In the illustrated example, there are two rods 21 and 21. The caps 2 and 3 are provided with a plurality of cylindrical projecting cylinders 22 and 23 for receiving the ends of the rods on the opposite surfaces at equal intervals in the circumferential direction at the same distance from the center. The protruding cylinder is fitted and connected to each end of the rod 21. The rod 21 is made of, for example, stainless steel, and has an axis centered between the centers of the caps 2 and 3 and the outer circumference. Also in this embodiment, the cylindrical case 1 is fixed and the caps 2 and 3 are fixed.
When the rotational force is transmitted to either of the
21 and the other cap tend to rotate integrally, and at this time, the rods 21 and 21 must stir the granules 4 filled with the gas in the case, so that the transmitted rotational force is damped.

The stirring member 6 of the third embodiment shown in FIGS. 6 and 7 is a ribbon conveyor type ribbon 3 in which a strip-shaped thin plate is spirally twisted.
It is 1. The caps 2 and 3 are provided with slits 32 and 33, which receive the respective end portions of the ribbon 31, across their centers on opposite surfaces, and the slits 32 and 33 are connected to receive the respective end portions of the ribbon 31. . The strip-shaped thin plate that constitutes the ribbon 31 is made of, for example, stainless steel, and the width of the thin plate is slightly smaller than the diameter of the cylindrical case 1. Also in this embodiment, when the cylindrical case 1 is fixed and the rotational force is transmitted to one of the caps 2 and 3, the ribbon 31 and the other cap try to rotate integrally, and at that time, the ribbon 31 is firmly in the case. Since the filled granules 4 have to be stirred,
The transmitted torque is braked. In the case of this embodiment, depending on the twisting direction of the ribbon 31 and the rotational direction of the rotational force transmitted, the particles in the cylindrical case are axially moved toward either end of the case by the rotation of the ribbon. Since it is pressed and consolidated, the braking force that damps the rotational force is large.

In any of the above-mentioned embodiments, if the cylindrical case is filled with a viscous fluid in addition to the particles, the braking force for damping the rotational force can be increased.

[0010]

As is apparent from the above, the stirring body 6 stirs in order to damp the rotational force transmitted to the stirrer and the cylindrical case, which are the granules filled in the cylindrical case. The clearance between and may be large,
Its manufacturing accuracy is rough, and it is easy to manufacture and assemble. Further, the braking force for damping the rotational force can be increased by increasing the diameters of the cylindrical case and the agitator, but can also be increased by increasing the axial lengths of the cylindrical case and the agitator. Therefore, the diameter and the axial length can be optimally determined according to the space of the device used, and the device used can be made smaller and thinner.

[Brief description of drawings]

FIG. 1 is an axial sectional view of a first embodiment of a rotary damper of the present invention.

FIG. 2 is an end view of the rotary damper of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an axial sectional view of a second embodiment of the rotary damper of the present invention.

5 is a cross-sectional view taken along line VV of FIG.

FIG. 6 is an axial sectional view of a third embodiment of the rotary damper of the present invention.

FIG. 7 is an enlarged sectional view taken along line VII-VII in FIG.

[Explanation of symbols]

 1 Cylindrical Case 2 Cap 3 Cap 4 Grain 5 Viscous Fluid 6 Stirrer 11 Elliptic Cylinder (Stirrer) 21 Rod (Stirrer) 31 Ribbon (Stirrer)

Claims (2)

[Claims] 1. A cylindrical case is filled with particles, and
A rotary damper characterized in that both ends of the cylindrical case are closed by rotatable caps, and the caps at both ends are connected by a stirring body for stirring the granules in the cylindrical case. 2. The rotary damper according to claim 1, wherein the cylindrical case is filled with viscous fluid in addition to particles.