JP3175019B2 - Rotary damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a linear or swivel motion transmitted by a linear rack or an arc rack.
Alternatively, the present invention relates to a rotation damper for quieting rotation transmitted by a gear.

[0002]

2. Description of the Related Art A rotor having a central axis and a dish-shaped housing in which the rotor rotates are separately formed, and silicon oil is interposed between an inner surface of a bottom wall of the dish-shaped housing and a lower surface of the rotor. A rotary damper that silences the above-mentioned rotation and other movements by viscous resistance of silicone oil is conventionally known.

[0003]

The above-mentioned conventional rotary damper requires a step of filling a silicone oil during the assembling step. To prevent the filled silicone oil from leaking out, an O-ring is fitted on the rotating shaft of the rotor, and an O-ring with a larger diameter is fitted on the inner periphery of the dish-shaped housing. A cap having a center hole through which the shaft passes is fixed over the dish-shaped housing from above, and a large-diameter O-ring is compressed at the periphery of the cap, and the O-ring fitted around the center shaft around the center hole is compressed. It is necessary. Therefore, the number of parts to be used increases, and the assembly is very troublesome. Further, since the dimensional accuracy of the housing is severe, there are few variations in the shape of the flange for fixing the housing to the machine body.

[0004]

The present invention SUMMARY OF], there is has been developed to solve the above problems, the rotary damper of the first claims includes a rotor having a central axis molded two-color in plastic A housing for rotatably enclosing the rotor with the tip of the center shaft protruding outward, mixing oil when molding the rotor and one or both of the housing, and dispersing the oil into the rotor and the housing. Characterized in that it oozes out on the contact surface. According to a second aspect of the present invention, there is provided a rotary damper comprising: a rotor having a central shaft formed of two colors of plastic; and a housing for rotatably enclosing the rotor by projecting a tip end of the central shaft outward. Molded with a soft material, the housing is brought into frictional contact with the rotor by shrinkage after molding, and oil is mixed when molding the rotor and one or both of the housing, and the oil is mixed on the contact surface between the rotor and the housing. It is characterized by being exuded.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, reference numeral 10 denotes a circular rotor having a central axis 11, and reference numeral 12 denotes a rotor 10 rotatably contained by projecting an upper end of the central axis 11 out of a central hole 13 in an upper wall. Reference numeral 14 denotes a flange for fixing the housing 12 to the used body. This rotary damper pre-molds a rotor 10 having a central axis 11,
The housing 12 is molded in two colors of plastic so as to surround the rotor 10.

According to the first aspect of the present invention, there is provided a rotary damper comprising:
0 is molded from a silicone-mixed polyacetal resin in which silicone oil is mixed in the pellets, and two-color molding is performed outside of the rotor 10. May be molded,
One of the rotor 10 and the housing 12 may be formed of a resin mixed with silicon, and the other may be formed of a resin not mixed with silicon. In addition, one or both of the resin for rotor molding and the resin for housing molding,
And stearic phosphate, mixed with an appropriate amount of a slip agent such as oleic acid amide, may be increased frictional force. As a result, the rotary damper according to the first aspect includes the rotor 10 and the housing 1.
2 is filled with an oil film of silicon oil oozing out from both or one of them, and the silicone oil transmits an external movement transmitted through a pinion attached to its central shaft 11 in order to rotate the rotor 10. Quiet due to the viscous resistance of the oil film. And a franc for fixing to the aircraft used
Since the die 14 is a soft material integrated with the housing 12,
The inside of the bottom wall of the housing 12 reaches inside the flange 14
Metal plate 15 can be insert-molded and reinforced.
Preferred (see FIG. 3).

In the rotary damper according to the second aspect , the rotor 10 is formed by mixing silicone oil into pellets and forming the housing 12 outside the rotor 10 with a suitable soft material such as an olefin-based thermoplastic elastomer. Molding.
At this time, in consideration of the fact that the housing 12 contracts after molding, the dimensions are determined and molded such that the inner surface of the housing 12 comes into frictional contact with the upper surface, the lower surface, and the outer peripheral surface of the circular rotor 10 when contracted. In order to increase the frictional force, if necessary, a slip material such as stearic acid or oleic acid amide should be added to the soft material for forming the housing 12 by about 3%.
It may be mixed. Thus, the rotary damper as in claim 2 wherein the movement of the outer delivered via a pinion attached to the center shaft 1 1 as it Mawaso the rotor 10, the rotor 10, the rotor 10 shrinks after molding The frictional force between the contacting soft material housing 12 and the rotor 10
And the viscous resistance of the oil film of the silicon oil from the rotor 10 oozing into the gap between the housing 12 and the housing 12 due to the difference in shrinkage after molding . Since the flange 14 for fixing to the used body is a soft material integrated with the housing 12, the flange 14 is provided in the bottom wall of the housing 12.
It is preferable to insert-mold and reinforce the metal plate 15 reaching the inside (see FIG. 3).

[0008]

As is apparent from the above, the rotary damper of the present invention is composed of a rotor and a housing containing the rotor, and is manufactured by two-color molding. There is no need to take measures to prevent leakage. Therefore, productivity is extremely high.
Further, a variation in the shape of the flange of the housing can be easily made, so that the housing can be adapted to the body used.

[Brief description of the drawings]

FIG. 1 is a perspective view of a molded rotor.

FIG. 2 is a perspective view of a rotary damper in which a housing is formed in two colors outside a rotor.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rotor 11 Rotor center axis 12 Housing 14 Housing fixing flange

Claims (2)

(57) [Claims] 1. A rotor having a central shaft formed of two colors of plastic, and a housing for rotatably enclosing the rotor by protruding a tip end of the central shaft outwardly. A rotary damper characterized in that oil is mixed when molding both, and the oil is exuded on a contact surface between a rotor and a housing. 2. A rotor having a central shaft formed of two colors of plastic, and a housing that protrudes the tip of the central shaft outward to enclose the rotor in a rotatable manner, wherein the housing is formed of a soft material. In addition to the fact that the housing is brought into frictional contact with the rotor by shrinkage after molding, oil is mixed when molding the rotor and one or both of the housing, and the oil is oozed to the contact surface between the rotor and the housing. Features a rotating damper.