KR20010049873A - oil type cylindrical rotary damper - Google Patents

Abstract

PURPOSE: An oil cylindrical rotational damper is provided which has a simple structure, made compact and light, and manufactured inexpensively, and an assist grip into which the damper is built. CONSTITUTION: The damper comprises a housing having an inner cylinder(11) and an outer cylinder(12) which disposed concentrically with each other and an annular space(13) formed between the inner cylinder and the outer cylinder containing a viscous fluid(52). A cylindrical rotor accommodated in the housing and which receives a damping action from the viscous fluid(52). An annular cap(40) is mounted to the housing. The cylindrical rotor and the annular cap(40) are independently formed. A first sealing member(53) is mounted on the inner surroundings(41) of the cap(40), and a second sealing member(54) is formed at the inner surroundings of the cylidrical rotor.

Description

Oil type cylindrical rotary damper

The present invention relates to an oil-type cylindrical rotary damper for braking the rotation of the shaft by the viscous resistance such as silicone oil.

Conventionally, a housing having an inner cylinder portion and an outer cylinder portion on the same axis, having a housing having an oil reservoir filled with viscous fluid between the inner cylinder portion and an outer cylinder portion, and inserted into the oil reservoir and torqued therebetween. Rotor for generating a, an annular cap disposed at the open end of the outer cylindrical portion of the housing, and the viscous fluid of the oil reservoir is leaked to the outside along the outer circumference of the inner cylinder portion and the inner circumference of the outer cylinder portion of the housing An oil chamber cylindrical rotary damper is known which has two first and second seal members to prevent the shaft member from penetrating the inner cylindrical portion of the housing and the inner circumference of the rotor (German Utility Model 296 04 260 U1). Reference).

In the conventional oil chamber cylindrical rotary damper, the cap is integrally formed on the rotor, and the upper inner circumference of the outer cylindrical portion of the housing keeps the outer circumference of the cap rotatably, and the outer circumference of the upper end of the rotor An annular end portion for retaining a large diameter member compressed in between, and an annular end for retaining a small diameter member compressed in between the upper end of the inner cylindrical portion and the inner perimeter of the upper end of the rotor. The shape end is formed. Therefore, since the upper end portion of the outer cylindrical portion and the inner cylindrical portion of the housing is formed thin by the annular end, the wall of the outer cylindrical portion or the inner cylindrical portion should be formed thick in order to give sufficient strength thereto, whereby the radial direction of the housing The dimension of the becomes large.

In addition, when the cap is formed integrally with the rotor to prevent the open end of the outer cylindrical portion of the housing, and the cap prevents the escape of the seal member to the outside, the sealability is deteriorated and the torque stability is insufficient. A problem occurs. In the oil chamber cylindrical damper, the shear force between the viscous fluid filled in the gap between the rotor and the wall of the housing becomes a resistance, and the torque is generated. This gap is very small. The fact that the rotor also serves as the cap of the housing means that both members are circular, and if the coaxiality of both members is slightly misaligned, the squeeze value of the seal member will vary depending on the part. The distance between the walls is also not constant. It is also conceivable that the engaging portion of the rotor cap and the housing becomes smaller due to the sliding operation. Due to the above reasons, a decrease in actual performance and instability of torque occur. In order to solve this problem, it is necessary to improve the molding precision of the rotor and the housing, and the manufacturing cost becomes very high.

In Figure 1, (a) is a longitudinal sectional front view showing an embodiment of the rotary damper of the present invention, (b) is a longitudinal sectional view, (c) is a C-C cross-sectional view of (a)

Figure 2 is an exploded perspective view showing a part of all parts in cross section

In Fig. 3, (a) is a longitudinal sectional front view showing an exploded state of a cylindrical head and a braking cylinder portion constituting the rotor, and (b) is a longitudinal sectional side view thereof.

In FIG. 4, (a) is a front view showing the cross section of a part of the rotor which consists of a cylindrical head and a braking cylinder, and (b) is a side view thereof.

Explanation of symbols for main parts in the drawings

10-housing 11-inner cylinder

12-outer cylinder 13-oil reservoir

14-bottom wall 15-small diameter annular end

16-annular wall 17-longitudinal groove

18-Stone 20-Rotor

21-Braking cylinder 22-Up cylinder

23-Groove 24-Threshold

25-downward cutout 26-longitudinal groove

31-cylindrical head 32-hollow cylinder

33-downward cylindrical part 34-circular arc single part

35-Retaining Hole 36-Annular Groove

37-longitudinal groove 38-upward cut

39-protrusion 40-cap

41-medial perimeter 42-annular groove

43-annular recess 51-shaft member

52-viscous fluid 53-first seal member

54-second seal member 55-weld seal

The present invention was developed to solve the above problems, the housing having an inner cylinder portion and an outer cylinder portion on the same axis, and having a housing having an oil reservoir filled with a viscous fluid between the inner cylinder portion and the outer cylinder portion, A rotor inserted into the oil storage chamber and generating torque between the viscous fluid, an annular cap disposed at an open end of the outer cylindrical portion of the housing, and a viscous fluid of the oil storage chamber, the outer circumference of the inner cylinder portion of the housing; And two first and second seal members for preventing leakage to the outside along the inner circumference of the outer cylindrical portion, and an oil chamber cylindrical rotation for allowing the shaft member to penetrate the inner circumference of the housing and the inner circumference of the rotor. In the damper, the rotor and the cap are separated, and the rotor is provided with a hollow cylindrical portion projecting outward through the inner circumference of the cap. And an upper end portion of the inner cylindrical portion of the housing on an inner circumference of the cap, while maintaining a first seal member compressed between the outer cylindrical portion and the outer circumference of the hollow cylinder portion, and on an inner circumference of the rotor inserted into the oil storage chamber of the housing. It characterized by holding the 2nd seal member compressed between the outer periphery.

In addition, the rotor consists of a cylindrical head having the hollow cylindrical portion and two parts of a braking cylindrical portion joined below the cylindrical head, and a second seal member held by the inner circumference of the rotor is joined to the cylindrical head and the braking cylindrical portion. It is preferable to place in.

In addition, it is preferable to seal between the outer edge of the upper end of the outer cylindrical portion of the housing and the lower outer edge of the cap with the welding seal, and to make the first seal member and the second seal member have the same diameter and the same size.

Embodiment of the Invention

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of this invention is described in detail based on drawing.

In the figure, 10 represents a housing, 20 represents a rotor, and 40 represents a cap, which are molded of plastic. In addition, in the following description, the upper and lower sides indicate a convenient direction or position based on the drawings and are not absolute.

The housing 10 includes an inner cylindrical portion 11 and an outer cylindrical portion 12 having the same axial center, and an oil storage chamber 13 which is an annular space between the inner cylindrical portion 11 and the outer cylindrical portion 12. The bottom wall 14 is formed integrally with the lower end, and the shaft member 51 is rotatably penetrated through the inner circumferential opening of the inner cylindrical portion 11, and a viscous fluid such as silicone oil is injected into the oil storage chamber 13 ( 52). The upper end of the outer cylindrical portion 12 protrudes upward longer than the upper end of the inner cylindrical portion 11.

A small diameter annular end portion 15 is formed at the upper end of the inner cylindrical portion 11 along its outer circumference. In addition, a thin annular wall portion 16 protrudes upward from the upper end of the outer cylindrical portion 12 along its inner circumference.

The rotor 20 is accommodated in the upper end of the braking cylinder portion 21 and the outer cylinder portion 12, which is inserted into the oil storage chamber 13 of the housing 10 and rotated, the inner cylinder portion of the housing 10 The cylindrical member 31 which has the hollow cylindrical part 32 into which the shaft member 51 which penetrated the 11 is inserted, and rotates integrally with the said braking cylindrical part 21 is provided. The inner diameter of the hollow cylindrical portion 32 of the cylindrical head 31 is smaller than the inner diameter of the inner cylindrical portion 11 of the housing 10.

The cylindrical head 31 is a downwardly cylindrical portion 33 falling downward along the inner circumference of the outer cylindrical portion 12 and a pair of downwardly extending radially opposed from the downwardly cylindrical portion 33. Has a circular cylindrical piece 34 and 34, and the braking cylindrical portion 21 has a thinner upward cylindrical portion 22 formed at an upper end thereof along the outer circumference of the inner cylindrical portion 11. The upward cylindrical portion 22 is fitted to the inner circumference of the downward cylindrical portion 33 of the cylindrical head 31 in the oil reservoir 13 of the housing 10. That is, the sum of the thicknesses of the upper cylindrical portion 22 and the thickness of the lower cylindrical portion 33 is equal to the radial interval of the oil storage chamber 13 between the inner cylindrical portion 11 and the outer cylindrical portion 12. . In addition, a pair of grooves 23 and 23 facing in the radial direction to which the arcuate one-piece portions 34 and 34 of the cylindrical head 31 are fitted are arranged on the outer circumference of the braking cylinder portion 21. 22 is formed to extend downward, and each of the grooves 23, the outward check protrusion 24 is formed to protrude, and corresponding to the arc-shaped piece 34, the check protrusion 24 hangs An engagement hole 35 to be fitted is formed.

In order to increase the braking force of the rotor 20 by increasing the capacity of the viscous fluid 52 in the oil reservoir 13, the braking cylindrical portion 21 has an upward cylindrical portion in a radial direction orthogonal to the grooves 23 and 23. Vertical grooves 26 and 26 through which lower cutouts 25 and 25 are formed at the upper end of the upper cutout portion 22 and 25 longer than the upper cylindrical portion 22, and lower ends of the lower cutouts 25 and 25 are connected in series. Is formed on the outer periphery of the braking cylinder 21. The cylindrical head 31 is provided with an annular groove 36 along its outer circumference in the vicinity of the upper end of the downward cylindrical portion 33 and in the radial direction perpendicular to the arcuate one-piece portions 34 and 34. Vertical grooves 37 and 37 communicating with the annular groove 36 and upward cuts 38 are formed at the lower ends of the vertical grooves 37 and 37.

Since the viscous fluid 52 injected into the oil storage chamber 13 is also filled in the cutouts 25 and 38, the longitudinal grooves 26 and 37, and the annular groove 36, the amount of capacity increases as well. When the rotor 20 rotates, the braking force must be rotated in response to the viscous fluid 52 filled in the cutouts 25 and 38, the longitudinal grooves 26 and 37, and the annular groove 36. Increases. Further, for the same purpose, a plurality of (three in the figure) longitudinal grooves 17 are formed at equal intervals along the circumferential direction also on the outer periphery of the inner cylindrical portion 11 of the housing 10.

The cap 40 has a thick annular plate and has an inner circumference 41 through which the hollow cylindrical portion 32 of the cylindrical head 31 passes, the outer diameter of which is the outer cylindrical portion of the housing 10. Same as the outer diameter of 12). The lower surface of the cap 40 is provided with an annular groove 42 for receiving the annular wall portion 16 of the outer cylindrical portion 12 and an annular recess 43 along the inner circumference 41. have.

In order to receive rotational power, the rotor 20 is provided with a pair of upward projections 39 and 39 which protrude in the radial direction from the upper end of the hollow cylindrical portion 32, and the outer cylindrical portion of the housing 10. A protrusion 18 for preventing rotation of the housing 10 is formed in the axial direction on the outer circumference of the 12.

The oil-type cylindrical rotary damper of the present invention configured as described above is assembled as follows.

As shown in FIGS. 2 to 4, the cylindrical head 31 and the brake cylindrical portion 21 in the disassembled state are combined to form the rotor 20. In order to do this, first, the second seal member 54 such as an O-ring is inserted into the inner circumference of the downward cylindrical portion 33 of the cylindrical head 31, and the pair of arc-shaped one-piece portions 34 of the cylindrical head 31 are inserted. , 34, and the pair of grooves 23, 23 of the braking cylinder 21 are aligned, and then the cylindrical head 31 and the braking cylinder 21 are pressed to fit. In this way, the circular arc portions 34 and 34 of the cylindrical head 31 slide into the groove portions 23 and 23 of the braking cylinder portion 21, whereby the circular arc portions 34 and 34 are fitted. The curb protrusions 24 and 24 formed in the grooves 23 and 23 are bent outwardly, and then elastically returned into the grooves 23 and 23 so that the check protrusions 24 and 24 become arcuate ones 34 and 34. The engagement holes 35 and 35 are formed in the engagement holes 35 and 35 respectively. At the same time, the second seal member 54 fitted in the downward cylindrical portion 33 of the cylindrical head 31 has the upper end of the upper cylindrical portion 22 of the braking cylindrical portion 21 and the upper lower surface of the lower cylindrical portion 33. Compressed between and. Therefore, the cylindrical head 31 and the braking cylinder portion 21 constitute the rotor 20 which is integrated, and the second seal member 54 is held.

Subsequently, a predetermined amount of viscous fluid 52 is injected into the oil storage chamber 13 of the housing 10, and the rotor 20 is press-fitted while inserting the braking cylinder 21 into the oil storage chamber 13. We accommodate in (10). In this way, the second seal member 54 that is compressed between the upper end of the upper cylindrical portion 22 of the braking cylindrical portion 21 and the lower surface of the upper end of the lower cylindrical portion 33 is disposed in the housing 10. By being compressed by the small diameter annular end portion 15 of the inner cylindrical portion 11, the viscous fluid 52 is prevented from leaking outward from the inner circumference of the hollow cylindrical portion 32 of the cylindrical head 31. Further, before or after the rotor 20 is accommodated in the housing 10, the first seal member 53 is fitted to the outer circumference of the hollow cylindrical portion 32 of the cylindrical head 31. The first seal member 53 may be the same as the second seal member 54 described above.

Then, the hollow cylindrical portion 32 of the cylindrical head 31 is fitted into the inner circumference 41 of the cap 40, and the outer cylinder of the housing 10 is formed in the annular groove 42 of the cap 40. The cap 40 is covered with the housing 10 while the annular wall portion 16 of the portion 12 is fitted. In this case, the hollow cylindrical portion is compressed by compressing the first seal member 53 fitted in the outer circumference of the hollow cylindrical portion 32 of the cylindrical head 31 in the annular recess 43 of the cap 40. The viscous fluid 52 is prevented from leaking to the outside at the outer circumference of the 32.

Finally, the welding seal portion 55 is formed by a suitable means such as high frequency welding at the contact portion between the lower outer edge of the cap 40 and the upper outer edge of the outer cylindrical portion 12 of the housing 10. In addition to preventing the cap 40 from coming off, the viscous fluid 52 at the contact portion is prevented from leaking to the outside.

This oil-type cylindrical rotary damper, as described, for example, in German Utility Model 296 04 260 U1, has an assist grip which is rotatably attached to the upper side wall of the left and right windshields of the passenger seat in the interior of the vehicle or the rear seat. When the crew releases the hand after the crew holds the hand and rotates the assist grip in the direction away from the side wall to resist the spring force, the assist grip is braked by the spring force of the spring to sharply turn toward the side wall, ie It is used to give a sense of quality by rotating silently and restoring to the original state.

Thus, for example, the shaft member 51 penetrating the inner cylindrical portion 11 of the housing 10, the hollow cylindrical portion 33 of the cylindrical head 31 of the rotor 20, and the center of the cap 40. Each end of the supporter is supported by a pair of brackets (not shown) fixed to the side wall of the vehicle, and the bearing piece (not shown) provided inside the arm of one side of the assist grip is brought close to the cap 40 so that the cap ( The projections 39 and 39 of the cylindrical head 31 of the rotor 20 protruding outward from 40 are inserted into the holes formed in the bearing pieces, and the outer circumference of the outer cylindrical portion 12 of the housing 10 is provided. The protrusions 18 protruding in the axial direction are engaged with the vehicle body side to fix the housing 10 to the vehicle body so that the rotor 20 rotates integrally with the assist grip. In addition, the other arm of the assist grip is rotatably attached to the vehicle body, and accommodates a spring, for example, a coil spring, which is pivotally rotated until the assist grip is abutted against the side wall. The above structure is outside the gist of the present invention, so please refer to the above German utility model.

When the rotor 20 is rotated forward / reverse while the housing 10 is fixed in this way, the oil storage chamber of the housing 10 in which the braking cylinder 21 of the rotor 20 receives the viscous fluid 52 is provided. In (13), since it must rotate against the viscous resistance of the viscous fluid 52, the external force which rotates the rotor 20 can be braked. This can brake the external force for rotating the housing 10 as described above even if the rotor 20 is used as a separate application for rotating the housing 10 while fixing the rotor 20.

According to claim 1, wherein the rotor is inserted into the oil reservoir of the housing and generates a torque between the viscous fluid and the annular cap disposed at the open end of the outer cylindrical portion of the housing as a separate body, the rotor inside the cap A hollow cylindrical portion projecting outwardly through the circumference, the first seal member being compressed between the outer cylindrical portion of the hollow cylinder portion on the inner circumference of the cap and inserted into the oil reservoir of the housing; Since the second seal member that is compressed between the upper end and the outer circumference of the inner cylindrical portion of the housing is held above the inner circumference, the ring for holding the first and second seal members in the outer cylindrical portion or the inner cylindrical portion of the housing. There is no need to form a shaped end. Therefore, since the outer cylindrical part and the inner cylindrical part of a housing do not need to be thick, the radial dimension of a housing can be made small. In addition, since the cap separate from the rotor does not rotate, the practicality is improved, that is, the viscous fluid filled in the oil storage chamber of the housing can be reliably prevented from leaking to the outside, thereby making the torque stable. . Further, since the same precision as in the case of integrally forming the rotor and the cap is not required, the manufacturing cost of separately molding the rotor and the cap also does not increase.

According to claim 2, the rotor that rotates in the viscous fluid of the oil reservoir of the housing consists of a cylindrical head having a hollow cylindrical portion and two parts of the braking cylindrical portion joined below the cylindrical head, the inner circumference of the rotor is maintained Since the 2nd seal member is arrange | positioned at the junction part of the said cylindrical head and a braking cylinder part, since the undercut which is necessary to hold | maintain the 2nd seal member is not needed like the case where a rotor is integrated, it can form easily. Further, according to claim 3, the viscous fluid can be prevented from leaking between the upper end of the outer cylindrical portion of the housing and the cap, and according to claim 4, the same seal member can be used as the first and second seal members. In addition to easy management, the assembly procedure is omitted since the first seal member and the second seal member do not have to be distinguished and used when assembling.

Claims (4)

A housing having an inner cylinder portion and an outer cylinder portion on the same axis, the housing having an oil storage chamber filled with a viscous fluid between the inner cylinder portion and the outer cylinder portion; A rotor inserted into the oil storage chamber and generating torque between the viscous fluid; An annular cap disposed at an open end of the outer cylindrical portion of the housing; And two first and second seal members for preventing the viscous fluid of the oil reservoir from leaking out along the outer circumference of the inner cylindrical portion of the housing and the inner circumference of the outer cylindrical portion of the housing. In the oil chamber cylindrical rotary damper having the shaft member penetrates the inner circumference of the former, Separate the rotor and the cap, The rotor is provided with a hollow cylindrical portion protruding outward through the inner circumference of the cap, While maintaining the first seal member compressed between the outer circumference of the hollow cylindrical portion on the inner circumference of the cap, the upper end of the inner cylindrical portion of the housing on the upper side of the inner circumference of the rotor inserted into the oil reservoir of the housing An oil type cylindrical rotary damper, characterized by holding a second seal member compressed between the periphery. The method according to claim 1, The rotor is composed of a cylindrical head having the hollow cylindrical portion and two parts of a braking cylindrical portion joined below the cylindrical head, and a second seal member held by the inner circumference of the rotor is disposed at the junction of the cylindrical head and the braking cylindrical portion. Oil type cylindrical rotary damper, characterized in that. The method according to claim 1 or 2, An oil type cylindrical rotary damper characterized by sealing between the outer edge of the upper end of the outer cylindrical portion of the housing and the lower outer edge of the cap with a welding seal. The method according to any one of claims 1 to 3, The oil type cylindrical rotary damper, characterized in that the first seal member and the second seal member are the same diameter, the same size.