JPH05332383A - Multidirectional rotary damper - Google Patents

Abstract

PURPOSE:To provide easiness to handle and easiness to obtain torque and further to attain facilitation of assembly and improvement of durability by providing a damper in a disk part provided in a shaft member and in an internal casing rotatable under braking in an external casing, so as to be rotatable about a shaft under braking to further slide a shaft part in a slot of the external casing under braking. CONSTITUTION:An internal casing 1 is turnably housed in cylindrical space in an external casing 3 by interposing a rolling elastic unit 4 in a pressure contact condition. In this way, the internal casing 1 is rotated while receiving a brake by the rolling elastic unit 4. On the other hand, disk-shaped space is formed in the internal casing 1, and a disk 22, provided in a shaft part 21 inserted to a slot 32 of the external casing 3, is housed by interposing the rolling elastic unit 4 and made rotatable while receiving braking force of the rolling elastic unit 4. IN this way, the shaft part 21 is slid along the slot 32 of the external casing 3 under braking force and further made rotatable about a shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-directional rotary damper applied to a rotary part such as a sun visor, an indoor mirror or an outdoor mirror which requires multi-directional rotation.

[0002]

2. Description of the Related Art Generally, a rotary damper is urged in one direction by a spring or the like acting on the rotating portion or the linearly moving portion,
It has a function of applying braking to the movement and slowly operating the rotating portion and the linear movement portion.

Further, as another rotary damper, a structure in which a highly viscous liquid is used to apply braking to the rotating portion and the linearly moving portion is disclosed, for example, in Japanese Utility Model Publication No. 57-8604 and Japanese Utility Model Publication 61.
-133134 gazette. Its structure is
In both cases, grease is interposed in the bearing space formed by loosely fitting the projection on the rotary shaft member side into the recess on the holding member side, and the rotational torque is applied to the rotary shaft member by utilizing the viscous resistance of this grease. Is generated.

[0004]

However, the rotary damper described above has various problems as described below. High processing precision is required because the mating surface precision is required to eliminate grease leakage. The shapes of the holding member and the rotary shaft member are complicated, and it is difficult to obtain the required processing accuracy. Grease-resistant materials have to be adopted as the materials of the holding member and the rotary shaft member, which are expensive. It is difficult to obtain the set torque. Torque reduction occurs due to deterioration of grease. It cannot be used for multi-directional torque generation in the holding member and the rotary shaft member.

Therefore, an object of the present invention is to solve all of the above problems, and it is easy to handle, torque in a desired direction can be obtained, and the durability and the structure are easy to disassemble and assemble. It provides a rotary damper.

[0006]

In order to achieve the above object, the present invention provides an outer casing having a cylindrical space inside and an elongated hole communicating with the inside on the circumference of the peripheral surface, and a cylinder of the outer casing. An inner casing that is rotatably accommodated in a space and has a disc-shaped inner space and a shaft portion insertion hole, and a disc portion at one end of the shaft portion, and the disc together with the shaft portion is the outer casing. A shaft member rotatably accommodated in the inner space of the inner casing through the long hole of the space, the space formed between the outer casing and the inner casing, and the inner casing and the peripheral surface of the disc portion. An elastic body is interposed in a space formed between the inner casing and the inner casing in a pressure contact state to apply resistance to relative rotation between the outer casing and the inner casing and between the inner casing and the disc portion of the shaft member. The multi-directional rotary damper characterized by comprising that the main structure.

[0007]

The shaft member is rotatable about its axis with respect to the inner casing while receiving the necessary braking force by the elastic body arranged so that its disc portion is pressed into the disc-shaped inner space of the inner casing. At the same time, since the inner casing can rotate in the outer casing in the circumferential direction while receiving the required braking force by the elastic body as well, the shaft portion receives a predetermined braking torque along the long hole of the outer casing. In addition to being able to slide, it also becomes possible to rotate about the axis while receiving a desired braking torque.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on illustrated embodiments. FIG. 1 shows a multi-directional rotary damper which is a typical embodiment of the present invention. FIG. 1 is an exploded perspective view of the rotary damper, FIG. 2 is a perspective view of the damper after assembly is completed, and FIG. FIG. 4 is a longitudinal sectional view of the rotary damper, and FIG. 4 is a perspective view of a main part of a sun visor to which the present invention is applied.

The multi-directional rotary damper according to the present invention has an inner casing 1, a shaft member 2, an outer casing 3, a rolling elastic body 4 and an elastic body holding frame 5 as main constituent members.
In these drawings, the outer surface shape of the outer casing 3 is formed in a cylindrical shape, but the shape is not limited to this.

In the figure, reference numeral 1 is a cylindrical inner casing made of a metal or a hard synthetic resin material, and a disc-shaped space 11 having an axis perpendicular to the axis is formed in the center of the casing 1. And the same disk-shaped space 1
A shaft portion insertion hole 12 which is orthogonal to the center of 1 and communicates with the outside is formed, and a short shaft support hole 13 is formed in the opposite portion.

Reference numeral 2 is also a shaft member made of metal or hard synthetic resin, and a disc portion 22 is integrally formed at one end of the shaft portion 21 of the coaxial member 2. This disc part 22
Is smaller than the size of the disk-shaped space 11 at a predetermined ratio. A short shaft 23 is formed at the center of the opposite surface of the disc portion 22, and the short shaft 23 receives the short shaft support hole 13 of the inner casing 1. The diameter of the shaft portion 21 is set to be slightly smaller than the diameter of the shaft portion insertion hole 12 so that the shaft portion 21 inserted in the coaxial portion insertion hole 12 can freely rotate inside the insertion hole 12. There is.

Reference numeral 3 denotes an outer casing, which is also made of a metal or a hard synthetic resin material like the inner casing 1 and has a cylindrical space 31 inside and a central portion of its peripheral surface. It has a long hole 32 having a predetermined length in the circumferential direction and communicating with the inside and outside. Further, on one side surface of the outer casing 3, a shaft portion 33 projecting outward on the axis of the outer casing 3 is provided. Cylindrical space 3
The diameter of 1 is set to be larger than the outer diameter of the inner casing 1 by a predetermined length.

Reference numeral 4 is rubber, silicone, urethane foam,
It is a roller-shaped rolling elastic body made of a material such as a thermoplastic elastomer capable of elastic deformation. The diameter of the rolling elastic body 3 is appropriately determined. For example, the size of the rolling elastic body 4 accommodated in the disc-shaped space 11 of the inner casing 1 is the disc-shaped space of the inner casing 1. 11
Is smaller than the difference between the inner diameter of the shaft member 2 and the diameter of the disc portion 22 of the shaft member 2, and is set to 1/2 or more of the difference. After the assembly of the rotary damper, it occurs between the inner casing 1 and the shaft member 2. It has a size to be placed in pressure contact with the space.

These rolling elastic bodies 4 are rotatably held by a plurality of (three in the illustrated example) holding shafts 51 projecting in parallel from a ring-shaped holding frame 5. In the illustrated example, three holding frames 5 are prepared for convenience, and two of the holding frames 5 are arranged at both ends of the cylindrical space 31 in the outer casing 3 and are held by the holding shaft 51. 4 is arranged so as to be interposed between the outer peripheral surface of the inner casing 1 and the inner peripheral surface of the outer casing 3 in a pressure contact state. Also, the remaining one
The individual holding frames 5 are fitted into the disc-shaped space 11 of the inner casing 1, and the rolling elastic body 4 rotatably held by the holding shaft 51 of the holding frame 5 has an inner circumference of the disc-shaped space 11. It is arranged in a pressure contact state between the surface and the outer peripheral surface of the disc portion 22 of the shaft member 2.

In the illustrated example, an elastic body is interposed between the disc-shaped space 11 of the inner casing 1 and the disc portion 22 of the shaft member 2 and between the surface of the inner casing 1 and the inner surface of the outer casing 3. Are roller-shaped rolling elastic bodies 4, but instead of these rolling elastic bodies 4, for example, the disc portion 2
2 or the entire inner peripheral surface of the disc space 11 of the inner casing 1, or a part of the surface of the inner casing 1 or a part of the inner surface of the outer casing 3, and an elastic layer is formed between them. The inner casing 1 and the shaft portion 2 are pressed together.
It is also possible to allow relative rotation while applying a predetermined rotational torque between the elastic layer and the first member, or to make the surface of the elastic layer an uneven surface and the corresponding other member surface an uneven surface. In this case, a predetermined torque fluctuation can be generated between the inner casing 1 and the outer casing 3 and when the inner casing 1 and the shaft portion 21 are relatively rotated.

The above-mentioned components as shown in FIG. 1 are assembled as follows to form the multidirectional rotary damper of the present invention having the structure as shown in FIGS. 2 and 3. According to the illustrated example, the inner casing 1 is divided into two parts in advance with the disk space 11 and the shaft part insertion hole 12 being half cracked. First, the holding frame 5 is made to hold the rolling elastic body 4, and The inner casing 1 is fitted into a half-split portion of the disk-shaped space 11, and then the shaft portion 21 of the shaft member 2 is inserted into the shaft portion insertion hole 12
The disc portion 22 is fitted into the half-split portion of the disc-shaped space 11 while being fitted into. In this way, a half-split disk-shaped space 1
After arranging several rolling elastic bodies 4 between the inner peripheral surface of No. 1 and the outer peripheral surface of the disk portion 22, the split surfaces of the remaining half-split portions of the inner casing 1 are butted against each other, and an adhesive or the like is appropriately added. It is fixed and integrated by means.

On the other hand, the outer casing 3 has a long hole 32.
Is vertically divided into two parts, and a holding frame 5 holding a rolling elastic body 4 is fitted into each bottom of the left and right divided parts 3a and 3b. In the divided portions 3a and 3b of the outer casing 3 thus prepared, the internal structure assembled as described above is arranged such that the shaft portion 21 thereof is located in the long hole 32, and the two divided portions 3a and 3b. Several rolling elastic bodies 4 are provided between the inner peripheral surface and the outer peripheral surface of the inner casing 1.
Are pressed into contact with each other, and the divided surfaces of the divided portions 3a and 3b are fixed by adhesion or the like to be integrated to complete the assembly.

The multi-directional rotary damper of the present invention assembled in this manner has the disc portion 2 of the shaft portion 21 as shown in FIG.
The rolling elastic body 4 that is in pressure contact with the inner space of the inner casing 1 allows the rotation of the shaft 2 around the axis while receiving the required braking torque, and the inner casing 1 also presses the inside of the outer casing 3 into the same pressure state. A rolling elastic body 4
Because it can be rotated by receiving a predetermined braking torque,
The shaft portion 21 has a long hole 32 around the axis and in the outer casing 3.
Can rotate under a predetermined braking torque.

Therefore, when this rotary damper is attached to the sun visor 6 of the vehicle in FIG. 4, the sun visor 6 can be horizontally rotated while receiving a predetermined braking torque as shown by an arrow, and at the same time, it can be vertically rotated. It is possible to rotate in the same direction with the same braking torque, and even after the rotation due to the braking torque, it stops on the spot and does not move easily.

[0020]

As is apparent from the above description, according to the present invention, the following excellent effects, which cannot be expected in the conventional rotary damper using grease or governor, are exhibited.

Since the rotating shaft can both rotate and revolve with respect to the outer casing, and at the same time each has a predetermined braking torque, it is also possible to stop the rotating shaft at a desired position. In a multi-axis rotary damper, it is possible to set different and independent torques for each shaft. If the contact pressure of the rolling elastic body is appropriately set, not only the desired torque can be obtained, but also a considerably stable torque can be obtained as compared with the conventional rotary damper described above. The set torque is easy to obtain and there is no wear when the torque is generated. No processing precision is required. The generated torque is always stable even at high and low temperatures. Since there is no need to worry about fluid leakage, high processing accuracy is not required.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a multi-directional rotary damper that is a typical embodiment of the present invention.

FIG. 2 is a functional explanatory view showing the inside of the rotary damper as seen through.

FIG. 3 is a vertical sectional view of the rotary damper.

FIG. 4 is a perspective view of a main part showing a function when the rotary damper is applied to a sun visor.

[Explanation of symbols]

 1 Inner casing 11 Disc-shaped space 12 Shaft part insertion hole 13 Short shaft insertion hole 2 Shaft member 21 Shaft part 22 Disc part 23 Short shaft 3 Outer casing 3a, 3b Divided part 31 Cylindrical space 32 Long hole 33 Shaft 4 Rolling Elastic body 5 Holding frame 51 Holding shaft 6 Sun visor

Claims (1)

[Claims] 1. An outer casing (3) having a cylindrical space (31) and an elongated hole (32) formed on the circumference of a peripheral surface.
An inner casing (1) that is rotatably housed in the cylindrical space (31) of the outer casing (3) and has a disc-shaped inner space (11) and a shaft insertion hole (12); It has a disc portion (22) at one end of the portion (21), and the disc (2) together with the shaft portion (21).
2) comprises a shaft member (2) rotatably housed in the internal space (11) of the inner casing (1) through a long hole (32) of the outer casing (3), and the outer casing (3 Between the inner casing (1) and the inner casing (1) and the space formed between the inner casing (1) and the peripheral surface of the disk (22), with the elastic body (4) interposed under pressure. The outer casing (3), the inner casing (1) and the inner casing (1)
A multi-directional rotary damper characterized in that resistance is imparted to relative rotation between the disc portion (22) of the shaft member (2) and the disc portion (22).