JP2603574Y2 - Rotary damper - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE invention relates to a rotary damper for braking the rotation by the viscous fluid, such as grease.

[0002]

2. Description of the Related Art A driven rotating member integrally provided with a gear, a fixed supporting member for rotatably holding the driven rotating member,
A rotary damper composed of two members and a viscous fluid, composed of a viscous fluid interposed between the two members, is disclosed in
It is known from JP 50840.

[0003]

The number of members to be used is reduced to two in order to reduce the size of the rotary damper. However, in order to exert a sufficient braking effect in spite of the small size, the conventional rotary damper is used. In the fixed support member is provided with a conical ridge, the concave conical portion provided on the driven rotating member is placed over the conical ridge, and an outer surface of the conical ridge and an inner surface of the concave conical portion are interposed with a viscous fluid, As a result, the contact area between the driven rotating member that comes into contact with the viscous fluid and the fixed support member is increased. Therefore, although it is small, it cannot be used in a thin space because it is tall.

[0004]

Means for Solving the Problems] The present invention is a compact, there is has been developed in order to obtain a flat rotary damper, the driven rotary member (1 integrally provided with a gear wheel (11)
0), and the fixed support member for rotatably holding the driven rotating member (10) (20), before Symbol two members (10, 20)
Interposed between, in the rotary damper consisting a viscous fluid (30) for braking the rotation of the driven rotating member (10), said fixed support member (20) has a circular bottom wall (21), an internal the dished part that takes viscous fluid (30) to (2
3) and the bottom wall (21) in the dish-shaped portion (23)
A plurality of arc-shaped walls (2
Comprising a 7), the driven rotary member (10) has a wall (12) on the circular, the dished portion of the fixed support member (20) and concentric (23), of the dished portion (23) An inverted dish-shaped portion (14) rotatably held on the inner periphery, and the inverted dish-shaped portion (1).
In concentric with the center of the arc-shaped 4) of the upper wall (12), is vertically apart circumferentially from the lower surface of Oite the upper wall (12),
The arc in the dish (23) of the fixed support member (20)
And a plurality of arcuate wings (17) protruding into the viscous fluid (30) in the dish-shaped portion (23) while avoiding the shaped wall (27) .

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, reference numeral 10 denotes a driven rotating member integrally provided with a gear 11, and reference numeral 20 denotes a driven rotating member 10 described above.
And a fixed support member 30 for rotatably holding the both members 1
0, 20 and is a viscous fluid such as grease for braking the rotation of the driven rotary member 10,
Is made of plastic.

The driven rotating member 10 has an inverted dish-shaped portion 14 composed of a circular upper wall 12 and a cylindrical wall 13 that hangs shortly from the periphery thereof. The gear 11 is concentric with the upper surface of the upper wall 12. Is provided. To illustrate the dimensions of the inverted dish 14,
The diameter of the top wall 12 is 10 mm, thickness 0.7 mm, top wall 12
Is 2.4 mm from the upper surface to the lower surface of the cylindrical wall 13. An annular projection 15 having a substantially semicircular cross section is provided on the outer periphery of the upper end of the cylindrical wall 13 of the inverted dish-shaped portion 14.

The fixed support member 20 has a dish-shaped portion 23 composed of a circular bottom wall 21 and a cylindrical wall 22 that stands upright from the periphery. To illustrate the dimensions of the dish 23, the bottom wall 2
1 has a diameter of 11.6 mm, a thickness of 0.7 mm, a thickness from the lower surface of the bottom wall to the upper surface of the cylindrical wall 22 is 3.4 mm,
On the inner periphery of the upper end of the cylindrical wall 22, the cylindrical wall 13 of the inverted dish portion 14 is provided.
Is provided with an annular groove 24 into which the annular projection 15 provided is fitted. When the inverted dish-shaped part 14 is pressed into the dish-shaped part 23, the annular projection 15 is fitted into the annular groove 24, and the driven rotary member 10 is fitted. Is rotatably held with respect to the fixed support member 20. The fixed support member 20 is provided with two brackets 25, 25 having holes for passing screws and pins for fixing and positioning with respect to the device, and protruding out of the dish-shaped portion.

A short shaft 16 hangs from the center of the lower surface of the upper wall 12 of the driven rotary member 10, and the bottom wall 21 of the fixed support member 20
A shaft cylinder 26 into which the shaft 16 protrudes rises from the center of the upper surface of the shaft. The lower end of the inner periphery of the shaft cylinder 26 is formed in the center hole 2 of the bottom wall 21.
Open through 1 '.

On the upper surface of the bottom wall 21 of the fixed support member 20 , a plurality of concentric arc-shaped walls 27 are provided upright at equal intervals in the circumferential direction. On the lower surface of the upper wall 12 of the driven rotary member 10 , a concentric arc-shaped wing 17 that projects from above into an annular space 28 between the inner periphery of the arc-shaped wall 27 and the outer periphery of the barrel 26. , And a plurality of them are vertically spaced at equal intervals in the circumferential direction. In this embodiment, the arc-shaped wall 27 and the arc-shaped wing piece 17 have a fan shape of 60 °, and are separated by a phase of 30 ° in the circumferential direction.
Are provided.

When the inverted dish 14 of the driven rotary member 10 is pushed into the dish 23 of the fixed support member 20 as described above, the viscous fluid is first wrapped around the shaft cylinder 26 of the dish. 3
Enter 0. As a result, the inverted dish-shaped part 14 is
When the driven rotary member 10 is rotatably held with respect to the fixed support member 20, the shaft 16 protrudes into the shaft cylinder 26, and the arcuate blade 17 protrudes into the viscous fluid 30 in the annular space 28. . The outer diameter of the shaft cylinder 26 is 3.0 mm, the inner diameter of the arcuate wall 27 is 5.8 mm, and the inner diameter of the arcuate blade piece 17 is 3.6.
mm, the outer diameter is 5.0 mm, the upper end of the arc-shaped wall 27 is close to the lower surface of the upper wall 12 of the inverted dish-shaped portion, and the lower end of the arc-shaped wing piece 17 is close to the upper surface of the bottom wall 21 of the dish-shaped portion. .

Thus, the rotary damper is assembled, and the gear 11
When the rotational force is transmitted to the driven rotating member 10 by meshing with the gears and the rack, the viscous fluid 3 is integrated with the inverted dish-shaped portion 14.
A plurality of arcuate wing 17 spaced that rush into 0 is forced to rotate against the resistance of the viscous fluid 30 Rutotomoni, should rotate while pushing aside the viscous fluid 30 meet that interval The driven rotating member 10
Effectively brake the rotation transmitted to . Also, driven rotation
When the rotational force is transmitted to the member 10,
A plurality of spaced-apart arcuate walls protruding into the permeable fluid 30
27 rotates relatively against the resistance of the viscous fluid 30
And a viscous fluid that fills the gap
Must rotate relatively while pushing through 30
Therefore, the rotation transmitted to the driven rotating member 10 is effectively controlled.
Move.

Furthermore, the viscous fluid 30 placed in the dish-shaped part 23 from the circumferential spacing of the arcuate walls 27, also fills the space 29 between the inner wall of the outer and the dished portion 23 of the arc-shaped wall 27, a large amount of viscous Fluid 30 enters. Then, the arcuate blade piece 1 protruding into the viscous fluid 30 in the annular space 28 between the barrel 26 and the arcuate wall 27.
7 as indicated by a broken line in FIG. 5, the outer circumference of the shaft tube 26 and close to the inner periphery of the arcuate wall 27, the barrel 26 and the arc-shaped wall 2
7 against the shear resistance between the annular space 2 and the annular space 2.
8, and a viscous fluid 30 that fills the circumferential spacing of the arcuate wings 17
Because in has the viscous fluid 30, and integrally with the viscous fluid 30 that meets the outer space 29 of the arcuate wall 27 via the viscous fluid 30 to meet the spacing of the arcuate walls 27, a large amount of the viscous fluid 30
Of the gear 11 and must be rotated while disturbing, so that the external rotation transmitted to the gear 11 can be more strongly braked.

[0013]

As is apparent from the above description, according to the present invention, it is possible to provide a small and flat rotary damper which can be incorporated even in a thin space and yet has an excellent braking effect. In particular, the arcuate wings of the driven rotating member that rotates by rushing into the viscous fluid contained in the dish-shaped portion of the fixed support member are separated in the circumferential direction, and the viscous fluid fills the separated space. Since it is necessary to rotate the viscous fluid that satisfies the interval ,
Of the fixed support member that enters the permeable fluid and rotates relatively
The walls are circumferentially separated and viscous fluid fills the separated space.
The arcuate wall scrapes viscous fluid that fills the gap
The braking effect is very high because the vehicle must be relatively rotated while moving .

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the rotary damper of the present invention.

FIG. 2 is a side view in which a part of a driven rotating member is sectioned.

FIG. 3 is a plan view of one half of the driven rotating member as viewed from above and the other half as viewed from below.

FIG. 4 is a sectional view of a fixed support member.

FIG. 5 is a plan view of a fixed support member.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 driven rotating member 11 gear 12 upper wall 14 inverted dish 17 arcuate wing piece 20 fixed support member 21 bottom wall 23 dish 27 arc-shaped wall 30 viscous fluid

Claims (1)

(57) [Scope of request for utility model registration] [Claim 1] with the gear (11) driven rotating member integrally includes (10), a fixed support member for rotatably holding the driven rotating member (10) (20), before Symbol both members (10,
Interposed between the 20), the rotary damper consisting a viscous fluid (30) for braking the rotation of the driven rotating member (10), said fixed support member (20) has a circular bottom wall (21) , dished portion containing the said viscous fluid (30) inside (2
3) and the bottom wall (21) in the dish-shaped portion (23)
A plurality of arc-shaped walls (2
Comprising a 7), the driven rotary member (10) has a wall (12) on the circular, the dished portion of the fixed support member (20) and concentric (23), of the dished portion (23) An inverted dish-shaped portion (14) rotatably held on the inner periphery, and an upper wall (1 ) of the inverted dish-shaped portion (14).
In concentric with the center of the arc-shaped 2), Oite apart circumferentially
The arc-shaped wall (27) in the dish-shaped portion (23) of the fixed support member (20) is vertically installed from the lower surface of the upper wall (12).
Avoid rotary damper, wherein the dished portion (23) a plurality of arcuate wings that projects into said viscous fluid (30) within and a (17), it.