JPH10213166A - Rotating damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a work burden at the time of fitting and also reduce fitting failure. SOLUTION: A rotary damper 1 is constituted having a rotor disposed in a case, and a rotary shaft 4 engaged with the rotor and rotated along with the rotor. Backlash space 41 is formed between the outer peripheral edge 4b of the rotary shaft 4 and a center hole part 3g of the rotor and between protruding pieces 4a of the rotary shaft 4 and cutout grooves 3f of the rotor. Accordingly, in case of being fixed to a seat back or the like that is a rotating object, even in case of the position of a screw or the like, a fitting member, being slightly shifted from a set position, the rotary shaft 4 is position-corrected within a range of the backlash space 41 in conformity to the axis of a rotating support shaft of the seat back or the like, thus making axis positions coincide with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotary damper.

[0002]

2. Description of the Related Art For example, when a backrest of a front seat of an automobile is returned from a reclining state, or when a toilet lid or a seat of a Western-style toilet is closed from an open state, the operation is slowed down. Let me
A rotary damper is used to reduce the impact at the end of the operation. Such a rotary damper generally has the following structure.

[0003] That is, a structure including a case, a rotor provided in the case, a viscous liquid filled in a small clearance between the rotor and the case, and a rotating shaft connected to the rotor. Have been. Then, the case is fixed to the above-mentioned backrest, etc., and the rotating shaft is connected to the rotation support shaft of the object to be rotated, such as the backrest, so that the rotor relatively rotates as the case rotates with the backrest. Thereby, the resistance of the viscous liquid is exerted, and the operation of the rotating object is slowed down.

[0004]

However, in the case of disposing it on the above-mentioned backrest or the like, the case of the rotary damper is fixed at an appropriate position on the side of the backrest by using a fixing screw, and is projected from the side of the backrest. Connected to the rotating shaft of the rotary damper. For this reason, if the position of the fixing screw is slightly deviated from the predetermined position, the axis of the rotation support shaft and the axis of the rotation shaft will not be located on a straight line, and one of the rotors will not move through the rotation shaft. The part is pressed against the inner surface of the case. Therefore, when the backrest is operated as it is, the backrest operates with an excessive force applied to the rotor, the case, and the rotating shaft, and the cushioning force becomes unstable. For this reason, when installing the rotary damper, it is necessary for the worker to perform the work with great care, and the work load is large, and it is difficult to reduce such a mounting failure no matter how carefully the work is performed. Met.

[0005] The present invention has been made in view of the above,
An object of the present invention is to provide a rotary damper that can reduce the work load at the time of mounting and can also reduce the number of mounting defects.

[0006]

In order to solve the above-mentioned problems, a rotary damper according to the present invention comprises: a rotor rotatably disposed in a case via a viscous liquid; A rotary shaft that rotates with the rotor, wherein the rotary shaft is engaged with the rotor with play.

[0007] For example, in this rotary damper, the case includes a main body having a substantially annular shape having a ring portion of a predetermined depth, and a substantially annular cover member for closing an open surface of the main body portion. The rotor is mounted in an annular portion that forms a main body of the case in a substantially annular planar shape, and the rotating shaft is inserted into a central hole of the rotor, and an engaging member formed on the rotating shaft is formed. The mating portion is disposed so as to engage with an engaged portion formed on the rotor, and the play is formed between the central hole of the rotor, the outer peripheral edge of the rotating shaft, and the engaging portion of the rotating shaft and the rotor. It is possible to adopt a configuration provided between the joining portion.
In this case, a plurality of first annular protruding walls along the circumferential direction are formed at intervals in the radial direction in the annular portion of the main body constituting the case, and the first annular projection of the main body is formed on the rotor. A second annular projecting wall can be formed along the circumferential direction so as to alternately engage with the projecting wall.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the figure, reference numeral 1 denotes a rotary damper according to the present embodiment, which includes a case 2, a rotor 3, a rotating shaft 4, and the like.

The case 2 has a main body 21 and a lid member 22. The main body 21 is formed in a substantially annular shape in plan view as shown in FIG. 1, and the annular portion 21 a is formed in a substantially concave cross section with a predetermined depth as shown in FIG. ) 21b is open. However, the inner peripheral wall 21c is formed such that the rising height from the bottom wall 21d is lower than the rising height of the outer peripheral wall 21e due to the arrangement of the rotating shaft 4 described later. Further, inside the ring portion 21a, between the inner peripheral wall 21c and the outer peripheral wall 21e, the first annular protruding walls 21f, 21g are arranged at predetermined radial distances from the bottom wall 21d along the circumferential direction. , 21h are formed upright. As shown in FIGS. 4 and 5, the first annular projecting walls 21f, 21g, 21h
Of these, the first annular protruding wall 21f provided on the innermost side is
Although formed over the entire circumference, the first annular protruding walls 21g and 21h provided at the center and the outermost are partially interrupted due to the relationship of molding strength and the like.

As shown in FIGS. 1 and 2, the cover member 22 is formed by processing a flat plate into a substantially annular shape, and closes one open surface (opening surface) 21b of the case 2 described above.
This is for preventing leakage of the viscous liquid and dropping of the rotor 3 and the rotating shaft 4 described later, and is provided after the rotor 3 and the rotating shaft 4 are loaded. In addition, the outer peripheral edge of the lid member 22 has an undercut portion 2 protruding from an appropriate portion of the outer peripheral wall 21 e of the main body portion 21.
1i, and is fitted to the main body 21. The inner peripheral edge 22b is formed such that the hole formed by the inner peripheral edge 22b becomes an insertion hole for the rotation support shaft of the object to be rotated, so that the rotation support shaft can be inserted.

A mounting plate portion 22a extending outward from the outer peripheral edge is projected from a part of the lid member 22, and a mounting groove 22b for a mounting member such as a screw formed on the mounting plate portion 22a. (See FIGS. 1 and 3).

As shown in FIGS. 6 and 8, the rotor 3
As shown in FIGS. 2, 6 and 7, the annular base 3a has an inner peripheral wall 21c formed on the main body 21 and three first Four second annular projecting walls 3b, 3c, 3d, 3e project in an annular shape with a thickness that fits into the gap formed by the annular projecting walls 21f, 21g, 21h and the outer peripheral wall 21e. Note that, of the second annular protruding walls 3b, 3c, 3d, 3e, the inner two second annular protruding walls 3b, 3c are provided over the entire circumference, but are provided on the outer side. The two second annular projecting walls 3d and 3e are partially cut off due to the relationship of molding strength and the like, and are interrupted. The overall height of the rotor 3 including the annular base 3a and the second annular projecting walls 3b, 3c, 3d, 3e is determined by the depth of the annular portion 21a of the main body 21 of the case 2,
That is, the distance from the contact end surface of the outer peripheral wall 21e with the lid member 22 to the inner surface of the bottom wall 21d is set to be substantially the same.

As shown in FIG. 2, the annular base 3a
A first O-ring 5 is disposed between the inner peripheral edge of the first O-ring 5 and the lid member 22, and the innermost second annular protruding wall 3b
A second O-ring 6 is arranged between the main body 21 and the bottom wall 21d of the ring 21a. Further, a third O-ring 7 is provided between the outer peripheral wall 21 e of the main body 21 and the lid member 22. The viscous liquid is located between the main body 21 and the rotor 4 and between the rotor 4 and the lid member 22 and outside the first and second O-rings 5 and 6 and the third O-ring.
Filled inside the ring.

A plurality of cutout grooves 3f having a predetermined width are formed at appropriate positions of the center hole 3g of the annular base portion 3a of the rotor 3 from the inner peripheral edge to the outer peripheral edge (FIGS. 1 and 1). 6 and FIG. 8). The notched groove 3f functions as an engaged portion that engages with a protruding piece 4a that is an engaging portion provided on the rotating shaft 4 described later.

As shown in FIGS. 1 and 9, the rotating shaft 4
It is formed in a substantially disk shape, and is disposed between the end face of the inner peripheral wall 21 c of the main body 21 constituting the case 2 and the lid member 22.
The rotating shaft 4 is provided with a protrusion 4a as an engaging portion at a position corresponding to the notched groove 3f as the engaged portion of the rotor 3 at a predetermined interval in the circumferential direction. Further, two semicircular through-holes 4c are formed in the outer peripheral edge 4b of the rotary shaft 4, and the rotation support shaft 12 of the object to be rotated is connected to the through-hole 4c.

Here, the outer diameter of the rotating shaft 4 is smaller than the inner diameter of the central hole 3 g of the rotor 3,
A predetermined play space 41 between the rotor and the central hole 3g of the rotor 3.
Are formed. The width of the protruding piece 4a is smaller than the width of the cutout groove 3f of the rotor 3, and a play space 41 is formed between the two.

Next, the operation of the rotary damper 1 according to this embodiment will be described. For example, as shown in FIGS. 11 and 12, below the backrest 11 of the front seat of the automobile, the end 12 a of the rotation support shaft 12 for the backrest 11 protruding from the side of the backrest 11 is rotated. Axis 4
Through the through hole 4c. In addition, the rotating shaft 12
Is divided into two forks according to the shape of the through hole 4c of the rotating shaft 4. Also, the tip of this end 12a is
It is fixedly connected to a frame 14 which is fixedly arranged at an immovable part in the vehicle body.

Next, a screw or the like, which is a mounting member, is inserted into the mounting groove 22b for the mounting member and tightened to fix the mounting plate 22a against the side of the backrest 11.

Further, one end of the coil spring 13 is fixed to the lid member 22 of the rotary damper 1, and the other end is fixed to the frame 14. The lever 1 is mounted on the frame 14.
The lock mechanism (not shown) of the backrest is released when the lever 15 is lifted.

In this state, when the lever 15 is lifted and a person seated on the front seat puts weight on the backrest 11, the backrest 11 pivots rearward with the case 2 around the rotary shaft 12, The coil spring 13 is twisted by the amount of rotation. When the lifted lever 15 is released, the backrest 11 is held in the reclining state by the lock mechanism. When the lever 15 is lifted again, the lock mechanism is released, and the backrest performs a return operation in which the backrest rotates forward (toward the handle) by the torsion torque of the coil spring 13. At this time, the case 2 also rotates forward with respect to the rotor 3 and the rotating shaft 4, but at that time, the viscous resistance of the filled viscous liquid acts, and the returning operation of the backrest 11 is performed slowly. .

As described above, in the present embodiment, the rotating shaft 4 and the rotor 3 are connected with the play space 41. Therefore, when fixing to the backrest 11, even if the position of the screw or the like as the attachment member slightly deviates from the set position, the rotating shaft 4 is positioned within the play space 41 in accordance with the axis of the rotating support shaft 12. It will be corrected and the axis positions will match.

In this embodiment, the case 2 is provided with a plurality of first annular projecting walls 21f, 21g, 21h,
The rotor 3 is provided with a plurality of second annular projecting walls 3b, 3c, 3d, 3e, which are alternately engaged with the rotor 3, and between them is filled with a viscous liquid. Therefore, the rotor 3 is
The viscous resistance of the viscous liquid due to the relative rotation of the rotating shaft 4 can be generated at a plurality of locations, and the viscous resistance also acts near the outer peripheral wall 21 e of the case 2 distant from the axis of the rotating shaft 4. Therefore, a large viscous resistance can be exerted even in a small size.

[0023]

According to the rotary damper of the present invention, the rotary shaft connected to the rotary support shaft of the rotating object engages with play with the rotor that exerts the viscous resistance of the viscous liquid. I have. Therefore, even if the mounting position on the object to be rotated slightly shifts, the axes of the rotating shaft and the rotating support shaft can be aligned, and an excessive force is applied to the rotor, the case, and the rotating shaft, and the cushioning function is not performed. Stability can be prevented. As a result, not only can mounting defects be reduced,
It is possible to reduce the work load on the worker when installing the rotary damper.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a rotary damper of the present invention as viewed from a lid member side.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is an exemplary plan view of the rotary damper according to the embodiment as viewed from a main body side;

FIG. 4 is a plan view showing a main body constituting the case of the rotary damper according to the embodiment;

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a plan view of the rotor of the rotary damper according to the embodiment;

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a bottom view of the rotor of the rotary damper according to the embodiment;

FIG. 9 is a plan view of a rotation shaft of the rotary damper according to the embodiment;

FIG. 10 is a sectional view taken along line DD of FIG. 9;

FIG. 11 is a detailed view showing a state where the rotary damper according to the embodiment is attached to a front seat of an automobile.

FIG. 11 is a schematic diagram showing a state in which the rotary damper according to the embodiment is attached to a front seat of an automobile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary damper 2 Case 21 Main part 22 Lid member 3 Rotor 4 Rotation axis

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Mitsuo Yamamoto 500 Furukawa-cho, Hamamatsu-shi, Shizuoka Prefecture Somic Ishikawauchi, Inc. (72) Inventor Takao Fukukawa 500 Furukawa-cho, Hamamatsu-city, Shizuoka Prefecture, Japan Yukihiro Hase 500 Furukawacho, Hamamatsu City, Shizuoka Prefecture

Claims (3)

[Claims] 1. A rotary damper having a rotor rotatably disposed in a case via a viscous liquid via a viscous liquid, and a rotary shaft engaged with the rotor and rotated together with the rotor. Is engaged with the rotor with play. 2. The case has a main body formed in a substantially annular shape in a plane having an annular portion of a predetermined depth, and a lid member in a substantially annular shape in a plane closing an open surface of the main body. The rotor is mounted in an annular portion constituting a main body of the case in a substantially annular planar shape, the rotating shaft is inserted into a central hole of the rotor, and an engaging portion formed on the rotating shaft includes a rotor. The play is provided between the central hole of the rotor and the outer peripheral edge of the rotating shaft and between the rotating shaft and the engaging portion of the rotor and the engaged portion. The rotary damper according to claim 1, wherein 3. A plurality of first annular protruding walls extending in a circumferential direction are formed at intervals in a radial direction in an annular portion of a main body constituting the case. 3. The rotary damper according to claim 2, wherein a second annular projecting wall is formed along the circumferential direction so as to alternately engage with the first annular projecting wall.