KR100584464B1 - Rotary damper - Google Patents

Abstract

(Problem) Providing a rotary damper which prevents the generation of noise caused by the air mixed in the housing even when the rotor rotates in both directions by preventing the air mixed in the housing from passing through the resistance part during assembly. do.

(Solution means) Resistance parts for moving the inside of the silicone oil in the housing to the housings 11 and 51, the silicone oil 21 accommodated in the housing, and the shaft portion 32 accommodated in the housing and protruding from the housing. In the rotary damper (D) consisting of a rotor (31) formed with a (36) and a zero ring (61) for preventing silicone oil from leaking between the shaft portion of the rotor and the housing, the resistance portion (36). The radial projection wall 37 extending radially to the outer circumferential end portion over the entire length of the longitudinal direction passing through the center of the shaft portion 32, and extends to both side ends in the circumferential direction at the outer periphery The outer circumferential stone wall 38 continuous to 37 is formed.

Description

Rotary Damper {ROTARY DAMPER}             

1 is a cross-sectional view of a rotary damper according to a first embodiment of the present invention.

2 is a cross-sectional view of the rotor shown in FIG.

3 is a plan view of the rotor shown in FIG.

4 is a bottom view of the rotor shown in FIG.

5 is a cross-sectional view of the rotor constituting the rotary damper of the second embodiment of the present invention;

6 is a plan view of the rotor shown in FIG.

7 is a bottom view of the rotor shown in FIG.

Explanation of symbols on the main parts of the drawings

D-Rotary Damper 11-Case (Housing)

12-Case body 13-Bottom

14-Cylindrical Wall Section 14a-Protruding Wall Section

15-receptacle 16-shaft support

17-mounting flange 18-mounting hole

21-Silicone Oil (Viscous Fluid) 31-Rotor

32-Shaft 33-Concave

34-I cut step 35-Fitting groove

36,36A-Resistance part 37-Radial stone wall (air movement regulation part)

38-Outer circumferential stone wall (air movement control part) 39-Air ingress recess

40-Radial Stone Wall (Air Movement Control) 41-Stone Wall (Air Movement Control)

51-cap (housing) 52-through-hole

53-step 54-fitting recesses

61-0 ring (sealed) 71-Driven gear

72-mounting hole 73-fitting protrusion

A-air

The present invention relates to, for example, a rotary damper for braking the rotation of a driven gear engaged with a gear or rack.

The rotary damper may include a rotor having a housing, a viscous fluid contained in the housing, a shaft part accommodated in the housing and protruding from the housing, and a resistance part moving in the viscous fluid in the housing, and the shaft part of the rotor; It consists of a sealing member which prevents the viscous fluid from leaking between the housing. In addition, a driven gear is attached to the shaft portion protruding from the housing.

(Patent Document 1) Japanese Patent Application Laid-Open No. 4-34015

Conventional rotary dampers have a platelet shape that is substantially plate-shaped so that air entrained in the housing during assembly is not located between the resistance portion of the rotor, which is the torque generating portion, and the bottom or ceiling surface of the housing. I am doing it.

However, since the rotor rotates in both directions, noise is generated when air entrained in the housing moves over the resistance portion and moves to the opposite side of the resistance portion.

The noise generated when the air mixed in the housing crosses the resistance portion is compressed by the air mixed in the housing as it rises through the resistance portion, and then the popping sound due to the rapid opening when passing over the resistance portion. I think).

In addition, such a joint easily occurs as the viscosity of the viscous fluid increases, and also occurs as the gap between the rotor and the housing decreases.

The present invention ensures that air entrained in the housing during assembly does not ride over the resistance portion, and does not excessively compress air entrained in the housing, thereby resulting from air entrained in the housing even if the rotor rotates in both directions. It is to provide a rotary damper that can prevent the occurrence of noise.

This invention is the following invention.

(1) a rotor having a housing, a viscous fluid accommodated in the housing, a shaft part accommodated in the housing and protruding from the housing, the resistance part moving in the viscous fluid in the housing, the shaft part and the housing; A rotary damper comprising a sealing member for preventing the viscous fluid from leaking between the air gaps, wherein an air movement restricting portion for regulating the movement of air is formed in the resistance portion.

(2) The damper (1) is characterized in that the air movement restricting portion is formed of a radial stone wall extending radially over the entire length of the resistance portion.

[3] The rotation damper of [1] or [2] above, wherein the air movement restricting portion includes an outer circumferential stone wall extending in the circumferential direction on the outer circumference of the resistor portion.

(4) The damper according to any one of (1) to (3) above, wherein the air movement restricting portion is formed on the upper and lower surfaces of the resistance portion.

According to the present invention, since the air movement restricting portion is formed in the resistor portion to regulate the movement of air, and the air movement restricting portion is formed as a radial stone wall extending radially over the entire length of the resistance portion, the rotor rotates in both directions. In addition, it is possible to prevent the air entrained in the housing from riding over the resistance part and at the same time avoiding excessive compression.

Therefore, even if the rotor rotates in both directions, it is possible to prevent the occurrence of noise caused by the air mixed in the housing.

In addition, since the air movement restricting portion includes an outer circumferential stone wall extending in the circumferential direction at the outer circumference of the resistance portion, air can enter the concave portion formed by the resistance portion and the air movement restricting portion, The torque generating part can be secured sufficiently.

In addition, since the air movement restricting portion is formed on the upper and lower surfaces of the resistance portion, the above effects can be further improved.

Embodiment of the Invention

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described based on drawing.

(First embodiment)

1 is a cross-sectional view of a rotary damper according to a first embodiment of the present invention, FIG. 2 is a sectional view of the rotor shown in FIG. 1, FIG. 3 is a plan view of the rotor shown in FIG. 2, and FIG. 4 is a bottom view of the rotor shown in FIG. It is also. 1 and 2 are cross-sectional views taken along line VII-VII of FIG. 3.

In Fig. 1, reference numeral D denotes a rotary damper, a case 11 made of synthetic resin, a silicone oil 21 as a viscous fluid contained in the case 11, and a case 11 contained therein, and a case 11 And a rotor 31 made of a synthetic resin having a resistance portion 36 which moves in the silicone oil 21 in the case 11 on the shaft portion 32 which protrudes outwardly from A through hole 52 through which the shaft portion 32 of the shaft penetrates is formed, and a cap 51 made of synthetic resin that closes the opening of the case 11, and the shaft portion 32 of the cap 51 and the rotor 31. (0) 61 as a sealing member which prevents the silicone oil 21 from leaking out between the?) And a driven gear made of synthetic resin attached to the shaft portion 32 of the rotor 31 protruding from the cap 51. It consists of 71.

The housing is composed of a case 11 and a cap 51.

The case 11 has a case body 12 having a cylindrical wall portion 14 formed along the outer circumference of the bottom portion 13 having a circular planar shape, and a cylindrical paper sheet formed at the center of the bottom surface of the bottom portion 13. The branch part 16 and the outer peripheral surface of the case main body 12 are formed in the radial direction at 180 degree intervals, and are comprised by the attachment flange 17 provided with the attachment hole 18. As shown in FIG.

And on the upper side of the cylindrical wall part 14, the thin protrusion wall part 14a which makes the surface which extended the inner peripheral surface of this cylindrical wall part 14 as an inner peripheral surface is formed.

Reference numeral 15 denotes an accommodating portion formed in the case main body 12 and corresponds to a lower portion of the protruding wall portion 14a as a portion for accommodating the silicone oil 21.

The rotor 31 is a cylindrical shaft portion 32 and a plate-shaped resistance portion 36 extending radially from the shaft portion 32 at intervals of 180 degrees, and having a planar shape forming a circle I-cut. Consists of.

The shaft portion 32 is provided with a cylindrical recess 33 on which the shaft support portion 16 of the case 11 is rotatably fitted on its bottom surface, and protrudes from the cap 51. An I-cut stepped portion 34 cut in I is formed, and fitting grooves 35 in the horizontal direction are formed in the flat portion (vertical surface) cut in I.

3 and 4, the radial projection wall 37 extending radially to the outer peripheral end portion over the entire length of the longitudinal direction passing through the center of the shaft portion 32 is air. In addition to being formed as a movement restriction portion, an outer circumferential stone wall 38 extending to both side ends in the circumferential direction at the outer circumference, and continuous to the radial stone wall 37, is formed as an air movement restriction portion.

As shown in FIGS. 3 and 4, the outer circumferential protrusion wall 38 is formed in a shape in which the inner circumferential sides of both ends are draped inward, and the width (length in the radial direction) of the end is long.

Moreover, the radial protrusion wall 37 and the outer peripheral wall 38 are formed in the upper and lower surfaces of the resistance part 36 as shown in FIG.

The air inlet recesses 39 (39a, 39b) are surrounded by the resistance portion 36, the radial protrusion wall 37, and the outer circumferential protrusion wall 38, and open at one end in the circumferential direction.

The cap 51 has a through hole 52 through which the shaft portion 32 of the rotor 31 penetrates at the center thereof, and the inner circumferential surface of the through hole 52 has a cylindrical shape from its middle portion to the lower end thereof. By further cutting, a stepped portion 53 is formed in which the 0 ring 61 is accommodated, and an annular fitting recess in which the protruding wall portion 14a of the case body 12 is fitted on the outer periphery of the lower side. The part 54 is formed.

In addition, an I-cut attachment hole 72 is formed in the center of the driven gear 71, and a fitting groove formed in the shaft portion 32 of the rotor 31 in the planar portion of the attachment hole 72 is formed. The fitting protrusion 73 to be fitted to the 35 is formed.

Next, an example of assembly of the rotary damper D is demonstrated.

First, the 0 ring 61 is inserted into the shaft portion 32 of the rotor 31, and the silicone oil 21 is applied to the recess 33 and the resistance 36, and then the recess 33 A part of the shaft portion 32 and the resistance portion 36 are accommodated into the accommodating portion 15 while fitting the shaft supporting portion 16 of the case 11 into the c).

Then, after the appropriate amount of silicone oil 21 is injected into the receiving portion 15, the fitting recess groove 54 while passing through the shaft portion 32 of the rotor 31 into the through hole 52 of the cap 51. By fitting the protruding wall portion 14a into the inside, the opening of the case 11 is closed by the cap 51.

When the opening of the case 11 is closed with the cap 51 in this manner, most of the air A in the protruding wall portion 14a is discharged out of the case 11, and the protruding wall portion 14a and the cap 51 come into close contact with each other. At the same time, the 0 ring 61 is accommodated in the step portion 53, and the 0 ring 61 prevents the silicone oil 21 from leaking between the shaft portion 32 and the cap 51.

The gap between the protruding wall portion 14a and the cap 51 is welded and sealed by, for example, a high frequency weld bonding method.

Then, when the shaft portion 32 protruding from the cap 51 is pushed into the mounting hole 72 of the driven gear 71, the fitting protrusion 73 is fitted into the fitting groove 35 so that the rotary damper is fitted. Assembly of (D) is complete | finished.

Subsequently, the operation will be described.

First, as shown by solid arrows in FIG. 3A, when the rotor 31 rotates clockwise, the resistance portion 36 rotates clockwise in the silicone oil 21. When the viscous and shear resistance of the silicone oil 21 is applied to the resistor portion 36, the rotation of the rotor 31 is braked.

Therefore, the driven gear 71 attached to the rotor 31 brakes the rotation or movement of the gear, rack, etc. to which the driven gear 71 is engaged to make the rotation or movement slow.

When the rotor 31 rotates clockwise in this manner, as shown in Fig. 3A, a negative pressure portion is generated downstream of an end portion of the outer circumferential protrusion wall 38, so that the case ( Air A mixed in 11) moves following the negative pressure portion as indicated by the solid line.

On the contrary, as indicated by the dotted arrows in FIG. 3B, when the rotor 31 rotates counterclockwise, the resistance part 36 rotates counterclockwise in the silicone oil 21. At this time, the viscous resistance and the shear resistance of the silicone oil 21 act on the resistor portion 36 to brake the rotation of the rotor 31.

Therefore, the driven gear 71 attached to the rotor 31 brakes the rotation or movement of the gear, rack, etc. to which the driven gear 71 is engaged to make the rotation or movement slow.

When the rotor 31 rotates in the counterclockwise direction, as shown in Fig. 3B, when the resistance portion 36 rotates clockwise last time, it is downstream of the end of the outer circumferential stone wall 38. Air (A) indicated by the solid line following the negative pressure portion generated in (P) moves into the air inlet recesses 39 and 39a, and the movement is restricted (stopped) by the radial protrusion wall 37. In addition, when the resistance portion 36 rotated clockwise last time, the air (A) indicated by the dotted line that enters the air inlet recesses 39 and 39b and is restricted (stopped) by the radial protrusion wall 37. Is moved out of the air inlet recesses 39 and 39b and follows the negative pressure portion generated downstream of the end of the outer circumferential protrusion wall 38.

In this way, the air A moving between the negative pressure portion and the air inlet concave portion 39 generated downstream P, Q of the end of the outer circumferential wall 38 moves between them in a state where it is hardly compressed. Done.

As described above, according to the first embodiment of the present invention, since the radial protrusion wall 37 and the outer circumferential stone wall 38 for restricting the movement of air are formed in the resistance portion 36, the rotor 31 is formed. Even if the rotation in both directions can be entered into the air inlet recess 39 so that the air (A) entrained in the housing does not pass over the resistor 36 and is not excessively compressed.

Therefore, even if the rotor 31 rotates in both directions, it is possible to prevent the occurrence of noise caused by the air A mixed in the housing.

And since the outer circumferential protrusion wall 38 was formed in the circumferential direction at the outer periphery of the resistance part 36, the torque generation part can be fully ensured between the housings.

Moreover, since the width | variety of the outer peripheral wall 38 which is the part which generate | occur | produces a negative pressure part was lengthened, air A does not flow easily into a torque generation part at the time of inversion, and stable torque can be obtained.

In addition, since the radial protrusion wall 37 and the outer circumferential protrusion wall 38 are formed on the upper and lower surfaces of the resistance portion 36, the above-described effects can be further improved.

(Second embodiment)

5 is a cross-sectional view of the rotor constituting the rotary damper according to the second embodiment of the present invention, FIG. 6 is a plan view of the rotor shown in FIG. 5, FIG. 7 is a bottom view of the rotor shown in FIG. 5, and a first embodiment. The same or equivalent parts as are denoted by the same reference numerals, and description thereof is omitted.

The rotor 31 in the second embodiment is accommodated in the case 11, and has a shaft portion 32 projecting outwardly from the case 11, and at an interval of 180 degrees from the shaft portion 32. It is extended radially and consists of the flat-plate resistance part 36A which forms the shape which cut a circle I-shaped.

On the upper surface side, the radially protruding wall 40 has an air movement restricting portion along its entire length along both side end portions in the longitudinal direction of the resistance portion 36A, as shown in FIG. As shown in FIG. 7, the projection wall 41 has an air movement restriction portion over the entire length except for the center portion of the predetermined interval along both side ends in the longitudinal direction of the resistance portion 36A on the lower surface side. It is formed as.

Subsequently, since the assembly of the rotary damper D is the same as in the first embodiment, the description thereof is omitted and the operation will be described.

As shown by the solid arrows in FIG. 6, when the rotor 31 rotates clockwise, the resistance portion 36A rotates clockwise in the silicone oil 21, and at this time, the resistance portion 36A The viscous resistance and shear resistance of the silicone oil 21 act on the brake, thereby rotating the rotor 31.

Therefore, the driven gear 71 attached to the rotor 31 brakes the rotation or movement of the gear, rat, etc. to which the driven gear 71 is engaged to make the rotation or movement slow.

In this way, when the rotor 31 rotates in the clockwise direction, a negative pressure portion is generated downstream of the outer circumference of the resistance portion 36A, so that air A mixed into the case 11 at the time of assembly is indicated by a solid line. It follows the negative pressure part and moves.

On the contrary, as shown by the dotted arrows in Fig. 6, when the rotor 31 rotates counterclockwise, the resistance portion 36A rotates counterclockwise in the silicone oil 21, and at this time, the resistance Viscous resistance and shear resistance of the silicone oil 21 act on the portion 36A, so that the rotation of the rotor 31 is braked.

Therefore, the driven gear 71 attached to the rotor 31 brakes the rotation or movement of the gear, rack, etc. to which the driven gear 71 is engaged to make the rotation or movement slow.

When the rotor 31 rotates in the counterclockwise direction, the air A shown by a solid line in FIG. 6 attempts to cross the resistance portion 36A to the negative pressure portion generated on the opposite side, but the radial stone wall 40 and It cannot be carried over by the protrusion wall 41, and moves to the negative pressure part which arises on the opposite side of the radial direction which does not cross the resistance part 36A as shown by the dotted line arrow, and follows this negative pressure part, and moves.

As described above, according to the second embodiment of the present invention, the same effects as in the first embodiment can be obtained.

In the above embodiment, the shaft support portion 16 is formed in the case 11 and the recess portion 33 is formed in the shaft portion 32. However, the rotor 31 is rotatably supported. It is good also as a structure which forms a part and forms an axial support part in a shaft part.

Moreover, although the example which used the silicone oil 21 as a viscous fluid was shown, other viscous fluids which function similarly, for example, grease etc., can also be used.

Although the example in which the resistance parts 36 and 36A are integrally molded to the shaft part 32 is shown, the shaft part and the resistance part are molded separately, for example, the angle between the respective shafts and the respective holes. You may comprise so that it may rotate integrally by a relationship.

In addition, the housing is composed of a case 11 and a cap 51, the housing portion 15 of the silicone oil 21 is formed in the case 11, and the shaft portion 32 of the rotor 31 penetrates. Although the through-hole 52 is formed in the cap 51, an example has been shown in which the zero ring 61 prevents leakage of the silicone oil 21 between the cap 51 and the shaft portion 32. The cap may be provided with a housing portion of the silicone oil, a through hole through which the shaft portion of the rotor penetrates the case, and a zero ring may prevent the silicone oil from leaking between the case and the shaft portion.

As described above, according to the present invention, since the air movement restricting portion is formed in the resistor portion to regulate the movement of air, the air movement restricting portion is formed of a radial stone wall extending radially over the entire length of the resistor portion, Even when rotating in both directions, the air entrained in the housing can be prevented from riding over the resistance unit and can not be excessively compressed. Therefore, even if the rotor rotates in both directions, it is possible to prevent the occurrence of noise caused by the air mixed in the housing.

In addition, since the air movement control portion includes an outer circumferential stone wall extending in the circumferential direction on the outer circumference of the resistance portion, air can enter the concave portion formed by the resistance portion and the air movement restriction portion, and between the housing and the housing. The torque generating part can be secured sufficiently.

In addition, since the air movement restricting portion is formed on the upper and lower surfaces of the resistance portion, the above effects can be further improved.

Claims (5)

A rotor having a housing, a viscous fluid accommodated in the housing, a shaft part accommodated in the housing and protruding from the housing, the resistance part moving in the viscous fluid in the housing, and the shaft and the housing In the rotary damper made of a sealing member for preventing the viscous fluid from leaking between, A rotary damper, characterized in that the air movement restriction portion for regulating the movement of air in the resistance portion. The method according to claim 1, And the air movement restricting portion is formed of a radial protrusion wall extending radially over the entire length of the resistance portion. The method according to claim 1 or 2, The air movement restriction portion is a rotary damper, characterized in that it comprises an outer circumferential stone wall extending in the circumferential direction on the outer periphery of the resistance portion. The method according to claim 1 or 2, And the air movement restricting portion is formed on the upper and lower surfaces of the resistor portion. The method according to claim 3, And the air movement restricting portion is formed on the upper and lower surfaces of the resistor portion.

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