JPH0331866Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a damper structure that utilizes the viscous resistance of fluid and solid friction.

[Prior art]

``Rotary damper that combines viscosity and friction'' The conventional rotary damper structure described in Nikkei Mechanical August 15, 1983, etc. used a spring clutch mechanism to change the rotational torque between forward and reverse rotation. In this structure, in order to ensure the clutch force of the spring, it was necessary to increase the number of turns of the coiled spring and increase the diameter of the rotating shaft. For this reason, the height of the spring increases in cross section, making it difficult to reduce the thickness. Furthermore, since the conventional clutch mechanism uses a metal coiled spring, extreme wear occurs on the sliding surface of the plastic rotating shaft and the coiled spring, resulting in play in the rotating shaft. Furthermore, since the viscous resistance of the fluid is utilized, fluid leakage causes liquid to adhere to the clutch portion, causing a decrease in frictional resistance and causing fatal slippage in the rotary damper. Furthermore, since the operating angle of the clutch, that is, the backlash is large, there is a problem in that the rotational speed becomes uneven at the initial stage of operation.

[Purpose of invention]

An object of the present invention is to provide a damper that eliminates the problems of wear and slippage crash that occur on sliding surfaces.

〔overview〕

A rotary damper has a rotating shaft, a clutch, and a rotating member, and uses viscous resistance and solid friction to change the load torque between forward and reverse rotations. A rotary damper in which a claw portion of a rotary shaft contacts saw teeth of the rotary member.

[Example] Hereinafter, an example of the present invention will be described. FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a perspective view of the embodiment of the present invention.

In the embodiments shown in FIGS. 1 and 2, the main body case 1
has the center of rotation of the rotating shaft 3, and is provided with unevenness to ensure a constant gap with the unevenness of the rotor 2. The rotor 2 is also provided with projections and depressions on the side of the main body case 1, and has saw teeth 2a that mesh with the claw portions 3a of the rotating shaft 3. The rotating shaft 3 is guided through the rotor 2 into a hole in the main body case.
The claw 3a of the rotating shaft 3 is in contact with the internal teeth 2a of the rotor 2. The cap 5 is guided by the main body case 1 and is pressed into contact with the rotating shaft via an O-ring 4, and the cap 5 is welded to the main body case 1. A fluid, such as silicone oil, is sealed in the gap between the main body case 1 and the cap 5. The main body case 1, rotor 2, rotating shaft 3, and cap 5 are made of plastic such as POM.

Torque transmitted from the outside is transmitted to the rotating shaft 3 and then to the rotor 2 via the claw 3a.
When the rotor 2 rotates, viscous resistance is generated by the fluid sealed in the gap between the main body case 1 and the rotor 2. When the rotating shaft 3 rotates counterclockwise, the rotor 2 rotates and viscous resistance occurs. Furthermore, when the rotating shaft 3 rotates clockwise, the viscous resistance is greater than the force with which the pawl portion 3a overcomes the internal teeth 2a of the rotor 2, so the pawl 3a overcomes the internal teeth 2a and the rotor 2 hardly rotates.

The unevenness of the main body case 1 and the rotor 2 has a large surface area and has the effect of generating a large amount of load torque due to viscous resistance. However, a flat surface with no unevenness may be used. The O-ring 4 has the role of preventing internal silicone oil from leaking from the rotating part to the outside, and the role of generating solid friction with the rotating shaft 3.

In another embodiment shown in FIG. 3, the latch mechanism of the rotor 2 and rotating shaft 3 of the embodiment of FIG. 1 is replaced with a vertical orientation. Note that the same numbers as in FIG. 1 indicate the same parts.

Saw teeth 2a are cut on the top surface of the rotor 2.
The rotating shaft 3 has two claws 3a each having a spring portion, which engage with saw teeth 2a on the upper surface of the rotor 2.
A portion surrounded by the main body case 1 and the cap 5 is filled with, for example, silicone oil. However, the number of claws 3a on the rotating shaft may be singular or plural.

Similar to the embodiment shown in FIG. 1, the rotational torque transmitted from the rotating shaft 3 is transmitted to the rotor 2 through the claw portion 3a. When the claw 3a of the rotating shaft 3 rotates counterclockwise,
The claw 3a of the rotating shaft 3 and the sawtooth 2a of the rotor 2 engage with each other, causing the rotor 2 to rotate and generate viscous resistance. In the case of clockwise rotation, the viscous resistance is greater than the force with which the pawl portion 3a overcomes the saw teeth 2a of the rotor 2, so the pawl 3a overcomes the saw teeth 2a and the rotor 2 does not rotate.

[Effect of idea]

As described above, the effect of the present invention is that the friction resistance is improved due to the structure of the parts made of the same material. Furthermore, since the sliding surface of the present invention is filled with viscous fluid, its wear resistance has been dramatically improved, increasing the durability and reliability of the product. It has also become possible to make the device thinner and smaller. Furthermore, the solid friction caused by the O-ring 4 improved the temperature characteristics of the damper effect. All parts are made of plastic that can be injection molded, making it easy to mass produce, and all parts can be assembled by casting, improving ease of assembly. Also, since the clutch is a ratchet mechanism, dimensional accuracy is reduced and yield is improved.
Therefore, this invention has a damper structure that dramatically improves durability, improves assembly, processability, and mass production, and is suitable for cost reduction. Appropriate.

[Brief explanation of the drawing]

FIG. 1: An assembled cross-sectional view of the present invention, FIG. 2: A perspective view of the present invention, and FIG. 3: An assembled cross-sectional view of another present invention. 1... Main body case, 2... Rotor, 3... Rotating shaft, 4
...O-ring, 5...cap.

Claims (1)

[Claims for Utility Model Registration] Consists of a case, a cap, a rotating shaft supported by the case and the cap, a clutch, and a rotating member, and a gap surrounded by the case and the cap is filled with fluid. The rotating shaft, the clutch, and the rotating member are immersed in the liquid, and the rotary damper applies a load torque in one direction of rotation due to the viscous resistance of the fluid. an O-ring is pressed between the rotation member and the shaft in the radial direction and the axial direction, the rotation member is formed in a substantially disk shape, and saw teeth are provided integrally with the rotation member near the outer peripheral end, and the clutch A rotary damper characterized in that saw teeth of the member and a claw portion integral with the rotating shaft are in contact with each other.