JPH11344066A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely prevent oil leakage by providing elastic plates between both side wall outside surfaces of a housing and an outer peripheral surface of a rotary shaft in a state that the outer peripheral edge part is fixed to each of both side wall outside faces and the inner peripheral edge part is fixed to an outer peripheral surface of the rotary shaft. SOLUTION: Elastic plates 7, 7 are mounted and fixed in a state that space between outside faces close to outer peripheral edge parts of both side walls 21, 22 in an annular housing 2 and an outer peripheral surface of a rotary shaft 1 projecting to the outside of a tubular housing 2 are completely covered. Because a disc part 7b between outer peripheral side fixing parts 7c and inner peripheral side fixing parts 7a of each of both the elastic plates 7, 7 twists in a peripheral direction when the annular housing 2 and the rotary shaft 1 relatively rotate, space between the annular housing 2 and the rotary shaft 1 become a completely sealed state by each of both the elastic plates 7, 7. As a result, leakage of hydraulic oil filled within each chamber a1, a1, a2, a2 of the annular housing 2 to the outside can be completely prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper which is provided, for example, on a rotary bearing of a lower arm or an upper arm of a vehicle to attenuate the rotation of the arm.

[0002]

2. Description of the Related Art Conventionally, as a rotary damper, for example, one described in Japanese Patent Application Laid-Open No. 9-79301 is known. In this conventional rotary damper, a working oil is filled between a housing and a rotation shaft having two fluid chambers defining the interior of the housing and having a rotatable vane. A rotary damper provided with damping force generating means for generating a damping force with respect to the relative rotation between the housing and the rotation shaft by restricting the flow of the working oil between the two fluid chambers.
A rotary seal member for hydraulically sealing the space between the rotary shaft and the rotary shaft is provided on the shaft support portion of the rotary shaft in the housing.

[0003]

However, since the rotary damper repeatedly rotates only within a certain angle range, the hydraulic seal member and the rotating shaft may be unevenly worn, or may be rotated due to biting of dust. There has been a problem that the shaft is easily damaged, which causes oil leakage.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a rotary damper that can completely prevent the occurrence of oil leakage.

[0005]

In order to achieve the above object, a rotary damper according to a first aspect of the present invention comprises a housing and at least two fluid chambers inside the housing and a rotatable vane. Fluid is filled between the rotating shaft and the rotating shaft provided to restrict relative flow of the fluid between the two fluid chambers defined by the vanes so that relative rotation between the housing and the rotating shaft can be achieved. In contrast, in a rotary damper provided with damping force generating means for generating a damping force, an outer peripheral edge is provided between outer side surfaces of both side walls of a housing supporting the rotating shaft and an outer peripheral surface of the rotating shaft. And an elastic plate provided with the inner peripheral edge fixed to the outer peripheral surface of the rotating shaft.
In the rotary damper according to the second aspect, in the rotary damper according to the first aspect, expansion and contraction due to a temperature change of the fluid filled in each of the two fluid chambers between the outer surface of each side wall of the housing and each of the elastic plates. Means for forming a reservoir chamber for absorbing water. In the rotary damper according to the third aspect, in the rotary damper according to the second aspect,
A means is provided in which a pressure reducing mechanism is provided in a flow path communicating between each of the two reservoir chambers and each of the two fluid chambers.
In the rotary damper according to the fourth aspect, in the rotary damper according to any one of the first to third aspects, between the outer peripheral edge of each of the two elastic plates and the outer surface of each of the side walls and / or the inside of each of the two elastic plates. A means is used in which the peripheral portion and the outer peripheral surface of the rotating shaft are fixed by bonding. In the rotary damper according to the fifth aspect, in the rotary damper according to any one of the first to third aspects, between the outer peripheral edge of each of the two elastic plates and the outer surface of each of the side walls and / or the inside of each of the two elastic plates. The peripheral portion and the outer peripheral surface of the rotating shaft are fixed by fastening with a fastening member. In the rotary damper according to the sixth aspect, in the rotary damper according to any one of the first to third aspects, an annular groove is provided in each of the outer surfaces of the side walls and / or the rotating shaft, and each of the elastic plates is provided in the annular groove. By fitting into the outer peripheral edge and / or the inner peripheral edge of the elastic plate, between the outer peripheral edge of each of the elastic plates and the outer surface of each of the side walls and / or the inner peripheral edge of each of the elastic plates and the outer peripheral surface of the rotating shaft. Is fixed.

[0006]

In the rotary damper according to the first aspect of the present invention,
With the above-described configuration, when the housing and the rotation shaft rotate relative to each other, the flow of fluid between the two fluid chambers defined by the vanes is limitedly allowed by the damping force generating means. A predetermined damping force is generated. And then,
The relative rotation between the housing and the rotation shaft is ensured by twisting between the outer fixed portion and the inner fixed portion of each elastic plate in the circumferential direction, and the two elastic plates rotate with the housing. The space between the shaft and the shaft is completely sealed, thereby completely preventing the fluid filled in the fluid chamber of the housing from leaking to the outside. In the rotary damper according to the second aspect of the present invention, since the fluid filled in the fluid chamber of the housing expands and contracts due to a change in temperature, the elastic plate and the elastic plate are connected to each other by the elastic force of the elastic plates. The expansion and contraction of the reservoir chamber volume formed between each of the side wall outer surfaces absorbs the expansion and contraction of the fluid in the fluid chamber of the housing. Therefore, the installation of the reservoir chamber including the free piston and the cylinder is omitted, and the system is downsized. In the rotary damper according to the third aspect, as described above, the outflow of fluid from each fluid chamber of the housing to each of the reservoir chambers can be controlled by the pressure reducing mechanism. In the rotary damper according to the fourth aspect, as described above, between the outer peripheral edge of each of the elastic plates and the outer surface of each of the side walls and / or between the inner peripheral edge of each of the elastic plates and the outer peripheral surface of the rotating shaft. Is fixed by bonding, so that the inside and outside of the fluid chamber are completely sealed, thereby completely preventing the occurrence of a problem due to dust being caught. In the rotary damper according to the fifth aspect, as described above, between the outer peripheral edge of each of the elastic plates and the outer surface of each of the side walls and / or between the inner peripheral edge of each of the elastic plates and the outer peripheral surface of the rotating shaft. Is fixed by being fastened by the fastening member, so that the work of sealing the fluid into the reservoir chamber can be easily performed. In the rotary damper according to the sixth aspect, as described above, only the outer peripheral edge and / or the inner peripheral edge of each of the elastic plates is fitted into the annular groove provided on the outer surface of each side wall and / or the rotating shaft. And between the outer peripheral edge of each of the elastic plates and the outer surface of each of the side walls and / or between the inner peripheral edge of each of the elastic plates and the outer peripheral surface of the rotating shaft. Is simplified.

[0007]

Embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 shows Embodiment 1 of the present invention.
2 is a sectional view showing the rotary damper (S1-S in FIGS. 2 and 3).
1 and FIG. 2 and FIG. 3 are S2-S in FIG.
2 is a sectional view taken along line S3-S3, and FIG.
FIG. 5 is a sectional view and a perspective view showing the state of attachment to the vehicle, taken along line 4-S4. As shown in these figures, the rotary damper according to the first embodiment of the present invention And an annular housing 2 connected and fixed to the upper arm A on the vehicle body bearing side. In addition, in FIG. 5, 41 is a bread parabar,
42 is a torque transmission arm, 43 is a rebound stopper,
44 is a lower arm, 45 is a spring, and 46 is a wheel.

First, as shown in FIG. 1 and FIG. 2, the annular housing 2 is composed of disk-shaped left and right side walls 21 and 22 having axial holes 21a and 22a and outer peripheral sides of the side walls 21 and 22. The outer peripheral cylindrical portion 23 to be connected and the both side walls 21 and 2
And a casing 24 interposed between the two.
Then, the axial holes 21a, 22a of the left and right side walls 21, 22 are provided.
Are mounted on the rotating shaft 1 via bearings 25 and 26, respectively, so that the annular housing 2 is mounted so as to be rotatable relative to the rotating shaft 1.

The outer cylindrical portion 23 is formed to have a different inner diameter with a ridge 23a having the same width as the casing 24 at the center of the inner surface, and the casing 24 is formed on the inner periphery of the ridge 23a. It is provided in a state where it is press-fitted and fixed to the surface.

A ridge 1a of the same width is also formed at the center of the outer surface of the rotating shaft 1 facing the ridge 23a, and the two ridges 23a, 1a and the casing 24 are arranged on both left and right sides. It is assembled in a sandwiched state between the walls 21 and 22, and the right opening edge of the outer peripheral cylindrical portion 23 is integrally fixed in a state of being hydraulically sealed by welding to the outer peripheral surface of the right side wall 22 at the time of assembling. The left opening edge of the outer peripheral cylindrical portion 23 is integrally fixed by caulking to the outer peripheral surface of the left side wall 21 at the time of assembling.
7, the space between the left side wall 21 and the left side wall 21 is hydraulically sealed. The disk-shaped partition wall 3 is provided so as to be sandwiched between the inner side surface of the right side wall 22 and the projections 23a, 1a and the casing 24.

The casing 24 is formed in a substantially cylindrical shape as shown in a sectional view of FIG. 2, and a pair of right and left substantially fan-shaped rotary cylinder chambers (fluid chambers) are formed by upper and lower partitions 24a and 24b. Each of the two rotary cylinder chambers is circumferentially defined by a pair of left and right vanes 4a, 4b having an annular shaft portion 4c fitted and fixed to the outer periphery of the rotating shaft 1 in two circumferential directions, a1 and a2, respectively. Have been. The outer peripheral surface of the annular shaft portion 4c is connected to the upper and lower partitions 24a, 2a.
By slidably abutting each of the inner circumferential arc surfaces of the tip of 4b, a pair of right and left substantially fan-shaped rotary cylinder chambers is sealed hydraulically. In addition, 28 and 29 are sealing members.

The upper partition 24a is provided with the partition 24a.
Are formed in the axial direction, and two through holes 24c and 24d are formed, and one opening of the two through holes 24c and 24d (FIG. 1).
1 and 2, the communication groove 2 formed on one end face of the upper partition wall 24a, as shown in FIGS.
4e, and the other opening (the right opening in FIG. 1) has a communication groove 24 formed in the other end face of the upper partition wall 24a, as shown in FIG.
f and 24g communicate with the chambers a2 and a1, respectively, and further, the chambers a1-a1 and the chamber a1, which face each other diagonally.
As shown in FIGS. 1 and 3, the communication grooves 22 b and 22 c formed in the end face of the right side wall 22 facing the partition wall 3 and the communication holes 3 formed in the partition wall 3.
a, 3b, 3c, and 3d are connected to each other.

The through-holes 24c and 24d have a predetermined flow with respect to the relative rotation between the annular housing 2 and the rotary shaft 1 by restricting the flow of hydraulic oil flowing through the respective through-holes 24c and 24d. The first damping force generating mechanism 5 for generating the damping force of the first embodiment and the second damping force generating mechanism 6 are accommodated therein.

That is, the first damping force generating mechanism 5 is configured as shown in FIG.
As shown in the detailed enlarged cross-sectional view of the relevant part, a predetermined damping force is provided to the valve body 5a attached to the through hole 24c by restricting only the flow of the working oil from right to left in the drawing. A configuration including a first damping valve 5b to be generated and a first check valve 5c provided in parallel with the first damping valve 5b and allowing only the flow of hydraulic oil from left to right in the drawing. Has become.

As shown in FIG. 1, the first damping force generating mechanism 5 only allows the hydraulic oil to flow from right to left in the drawing through the valve body 6a mounted in the through hole 24d. And a second damping valve 6a that generates a predetermined damping force by restricting the flow of the hydraulic oil, and is provided in parallel with the second damping valve 6b, and only allows the flow of hydraulic oil from left to right in the drawing. The configuration includes an allowable second check valve 6c.

Each of the chambers a1, a1, a2, a2
The working oil is filled in the inside and in each of the flow paths communicating these.

Both side walls 2 of the annular housing 2
The elastic plates 7, 7 are mounted and fixed so as to completely cover between the outer surfaces of the rotary shafts 1 protruding outside the tubular housing 2 and the outer surfaces of the rotary shafts 1 protruding outside the tubular housing 2.

The elastic plate 7 has a short cylindrical inner peripheral side fixing portion 7a as shown in FIG.
A thin disk portion 7b extending substantially conically outward from the center of the outer peripheral surface of the inner peripheral side fixed portion 7a; and further extending outward from the outer peripheral edge of the disk portion 7b. Outer side fixed part 7c
It is composed of An annular fixing member 7d which can be press-fitted and fixed to the small-diameter portions 1b at both ends of the rotating shaft 1 is mounted on the inner peripheral side of the short cylindrical inner peripheral side fixing portion 7a, and the mounting surface is vulcanized and adhered. As a result, the annular fixing member 7d is press-fitted and fixed to the outer circumference of the small diameter portions 1b and 1b of the rotating shaft 1, and the outer peripheral side fixing portion 7c is fixed to the respective side walls 21 and 22 of the annular housing 2. The respective elastic plates 7, 7 are assembled and fixed by being respectively vulcanized and bonded to the outer surface near the outer peripheral edge.

A reservoir chamber C filled with hydraulic oil is provided between the outer surface of each of the side walls 21 and 22 of the annular housing 2 and the inner surface of each of the elastic plates 7 and 7.
C is formed, and the reservoir chambers C, C and each of the chambers a
A minute gap D between the outer peripheral surface of the rotary shaft 1 and the inner peripheral surfaces of the bearings 25 and 26 mounted on the shaft holes 21a and 22a of the annular housing 2 is connected between the first and the first a1, a2 and a2. The passages are in communication with each other.

When the annular housing 2 and the rotating shaft 1 rotate relative to each other, the disk portion 7b between the outer fixed portion 7c and the inner fixed portion 7a of each of the elastic plates 7, 7 is rotated. By twisting in the directions, the relative rotation between the annular housing 2 and the rotation shaft 1 is ensured, and both the elastic plates 7, 7
As a result, the space between the annular housing 2 and the rotating shaft 1 is completely sealed, whereby the working oil filled in each of the chambers a1, a1, a2, and a2 of the annular housing 2 leaks to the outside. Is completely prevented.

Next, the operation of the first embodiment of the invention will be described. (A) Damping Force Generation Action Since the rotary damper according to the embodiment of the present invention is configured as described above, when the rotation shaft 1 and the annular housing 2 rotate relative to each other, for example, the rotation shaft 1 in FIG. Rotates counterclockwise, of the two chambers a1 and a2 defined by the respective vanes 4a and 4b, the chamber a1 side is pressurized and the chamber a2 side is depressurized. A communication groove 22b communicating between both chambers a1, a1, a communication groove 24f, a first damping valve 5b in a through hole 24c, a communication groove 24e, a second check valve 6c in a through hole 24d, a communication groove 24g, The fluid flows into the other two chambers a2 and a2 via the communication groove 22c.
A predetermined damping force is generated by the flow resistance when the damping valve 5b is opened.

When the rotating shaft 1 rotates clockwise in FIG. 2, the chamber a2 side is pressurized out of the two chambers a1 and a2 defined by the vanes 4a and 4b, respectively.
Since the pressure on the side is reduced, the working oil on the chamber a2 side
2, a communication groove 22c, a communication groove 24g, a second damping valve 6b in a through hole 24d, a communication groove 24e, a first check valve 5c in a through hole 24c, a communication groove 24f, and a communication groove 22b. Via the other two rooms a1, a
In this case, the working oil generates a predetermined damping force mainly due to the flow resistance when the second damping valve 6b is opened.

(B) Temperature Compensation Function When the operating oil in each of the chambers a1 and a2 thermally expands due to a rise in temperature, the inside of each of the chambers a1 and a2 is pressurized. As shown in FIG. The working oil causes a minute gap D between the outer peripheral surface of the rotating shaft 1 and the inner peripheral surfaces of the bearings 25 and 26 mounted on the axial holes 21 a and 22 a of the side walls 21 and 22 of the annular housing 2. It is pushed out to the reservoir chambers C, C formed outside the annular housing 2 as communication passages. At this time, each of the elastic plates 7, 7 forming the reservoir chambers C, C expands the volume in the reservoir chambers C, C by expanding the disk portions 7b, 7b outward by elasticity. Absorbs the thermal expansion of

Conversely, when the operating oil in each of the chambers a1 and a2 thermally contracts due to the temperature drop, as shown in FIG. 6B, the pressure in each of the chambers a1 and a2 becomes negative. Therefore, the working oil in the reservoir chambers C, C is supplied to the outer peripheral surface of the rotating shaft 1 and the bearings 25, 2 mounted in the axial holes 21a, 22a of both side walls 21, 22 in the annular housing 2.
6 is sucked into each of the chambers a1 and a2 of the annular housing 2 as a communication flow path with the annular gap D between the inner peripheral surface of the annular housing 6 and the inner peripheral surface of the annular housing D. At that time, the reservoir chamber C, C
, Each of the elastic plates 7, 7 has its disk portion 7b,
7b contracts inward due to the elastic restoring force, thereby reducing the volume in the reservoir chambers C and C.

As described in detail above, in the rotary damper according to the first embodiment of the present invention, the disk portion 7b between the outer fixed portion 7c and the inner fixed portion 7a of each of the elastic plates 7, 7 is provided. Is twisted in the circumferential direction, thereby ensuring the relative rotation between the annular housing 2 and the rotating shaft 1 and completely sealing the space between the annular housing 2 and the rotating shaft 1 by the respective elastic plates 7, 7. As a result, the working oil filled in each of the chambers a1 and a2 of the annular housing 2 can be completely prevented from leaking to the outside.

The reservoirs C absorb the expansion and contraction of the fluid filled in the chambers a1 and a2 on the outer surfaces of the side walls 21 and 22 of the annular housing 2 by the elastic plates 7 and 7, respectively. , C are formed integrally, so that the installation space can be effectively used and the system can be downsized as compared with the case where a separate reservoir including a free piston and a cylinder is installed as in the related art. Become.

The outer peripheral fixing portions 7c of the elastic plates 7, 7 and the side walls 21, 2 of the annular housing 2 are also provided.
2 between the outer surface near the outer peripheral edge and the inner peripheral side fixing portion 7
a and the annular fixing member 7d are respectively vulcanized and adhered, so that the two elastic plates 7, 7 are assembled and fixed, so that the chambers a1, a2 of the annular housing 2 and the outside are completely sealed. This makes it possible to completely prevent the occurrence of a malfunction due to dust being caught.

The inner peripheral side fixing portion 7a of the elastic plate 7
Is vulcanized and bonded to the annular fixing member 7d in advance, and the annular fixing member 7d is press-fitted and fixed to the rotating shaft 1, thereby improving the assembling workability as compared with the case where the elastic plate 7 is directly vulcanized and bonded. Will be able to do that.

Next, another embodiment of the present invention will be described. In the description of the other embodiments of the invention, only the differences from the first embodiment of the invention will be described, and the same reference numerals will be given to the same components, and the description thereof will be omitted.

(Embodiment 2) A rotary damper according to Embodiment 2 of the present invention has an axial center hole (21a) 2 of an annular housing 2 as shown in FIG.
In the outer circumference of the rotating shaft 1 within the inner circumference 2a, a minute space is formed between the outer circumferential surface of the rotating shaft 1 and the inner circumferential surface of the bearing (25) 26 mounted in the shaft hole (21a) 22a of the annular housing 2. Seal ring (decompression mechanism) that further narrows the gap (communication flow path) D
30 is mounted.

With the above configuration, the outflow of fluid from the chambers a1 and a2 of the annular housing 2 to the reservoir chambers C and C can be restricted. (Third Embodiment) A rotary damper according to a third embodiment of the present invention, as shown in an enlarged sectional view of a main part of FIG. 8, fastens inner fixed portions 7a of both elastic plates 7, 7 to each other. While the band 8 is fastened and fixed to the outer peripheral surface of the rotating shaft 1, the outer peripheral fixing portion 7c of each of the elastic plates 7, 7 is formed with an annular engaging portion 7e projecting inward. The portion 7e is fitted and engaged in an annular groove 22d formed on the outer peripheral surface of each of the side walls (21) 22, and the tip opening edge of the outer peripheral cylindrical portion 23 mounted on the outer periphery is crimped inward. The mounting structure is fixed by pressing.

With the above-described mounting structure, the number of steps for assembling the two elastic plates 7 and 7 is simplified as compared with the case of vulcanization bonding, and the structure is fixed by the fastening band 8. Accordingly, the work of filling the working oil into the reservoir chambers C, C can be easily performed.

Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments of the present invention, and design changes within a scope not departing from the gist of the present invention. The present invention is also included in the present invention.

For example, in the embodiment of the present invention, the case where it is provided on the rotation bearing portion of the upper arm of the vehicle is taken as an example. However, when the relative movement between arbitrary members is attenuated in the rotation direction, the present invention is applied. The invention can be applied.

[0035]

As described above, in the rotary damper according to the first aspect of the present invention, as described above, the housing and the inside of the housing are defined by at least two fluid chambers, and are rotated. Fluid is filled between a rotating shaft provided with a free vane, and the housing and the rotating shaft are restricted by allowing fluid to flow between two fluid chambers defined by the vane in a limited manner. A rotary damper provided with damping force generating means for generating a damping force with respect to relative rotation of the rotary shaft, wherein at least an outer peripheral edge portion is provided between outer peripheral surfaces of both side walls of the housing which supports the rotating shaft and an outer peripheral surface of the rotating shaft. The elastic plate is provided in a state where the elastic plate is fixed to the outer surface of each side wall and the inner peripheral edge is fixed to the outer peripheral surface of the rotating shaft, respectively. Circumference fixed part and By between is screwed in the circumferential direction,
While the relative rotation between the housing and the rotation shaft is secured,
The two elastic plates completely seal the space between the housing and the rotating shaft, so that the fluid filled in the fluid chamber of the housing can be completely prevented from leaking to the outside. The effect is obtained.

According to a second aspect of the present invention, there is provided the rotary damper according to the first aspect, wherein a temperature change of the fluid filled in each of the two fluid chambers between the outer surface of each side wall of the housing and each of the elastic plates. With the provision of the reservoir chamber for absorbing the expansion and contraction caused by the above, the installation of the reservoir chamber composed of the free piston and the cylinder is omitted, whereby the size can be reduced.

According to a third aspect of the present invention, in the rotary damper according to the second aspect, a decompression mechanism is provided in a flow path communicating between each of the reservoir chambers and each of the two fluid chambers. With this configuration, the outflow of fluid from both fluid chambers of the housing to both reservoir chambers can be controlled by the pressure reducing mechanism.

[0038] In the rotary damper according to the fourth aspect, in the rotary damper according to any one of the first to third aspects,
By using a means in which an outer peripheral portion of each of the elastic plates and an outer surface of each of the side walls and / or an inner peripheral portion of each of the elastic plates and an outer peripheral surface of the rotation shaft are fixed by bonding, The inside and the outside of each of the fluid chambers are completely sealed, thereby making it possible to completely prevent the occurrence of a problem due to dust being caught.

According to a fifth aspect of the present invention, there is provided a rotary damper according to any one of the first to third aspects.
Means that are fixed by fastening with a fastening member between an outer peripheral edge of each of the elastic plates and an outer surface of each of the side walls and / or between an inner peripheral edge of each of the elastic plates and an outer peripheral surface of the rotating shaft. By doing so, the work of sealing the fluid into the reservoir chamber can be easily performed.

According to the rotary damper of the sixth aspect, in the rotary damper of the first aspect,
An annular groove is provided on the outer surface of each of the side walls and / or the rotating shaft, and fitted into the outer peripheral edge and / or the inner peripheral edge of each of the elastic plates in the annular groove, whereby the outer peripheral edge of each of the elastic plates is formed. And the outer peripheral surface of both the side walls and / or the inner peripheral edge of each of the elastic plates and the outer peripheral surface of the rotating shaft are fixed, so that the elastic plate can be assembled only by the fitting process. Yes, this makes it possible to simplify the number of assembling steps.

[Brief description of the drawings]

FIG. 1 is an overall cross-sectional view (a cross-sectional view taken along line S1-S1 in FIGS. 2, 3, and 4) illustrating a rotary damper according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line S2-S2 in FIG.

FIG. 3 is a sectional view taken along line S3-S3 in FIG.

FIG. 4 is an enlarged sectional view taken along line S4-S4 of FIG. 2;

FIG. 5 is a sectional view and a perspective view showing a state where the rotary damper according to the first embodiment of the present invention is mounted on a vehicle body.

FIG. 6 is an enlarged cross-sectional view of a main part of the rotary damper according to the first embodiment of the present invention.
Indicates a temperature drop.

FIG. 7 is an enlarged sectional view of a main part of a rotary damper according to a second embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a main part of a rotary damper according to a third embodiment of the present invention.

[Explanation of symbols]

 C reservoir chamber D minute gap (flow path) a1 chamber (fluid chamber) a2 chamber (fluid chamber) 1 rotating shaft 2 annular housing 4a vane 4b vane 5 first damping force generating mechanism (damping force generating means) 6 second damping Force generating mechanism (damping force generating means) 7 Elastic plate 8 Fastening band (fastening member) 22d annular groove 30 Seal ring (decompression mechanism)

Claims (6)

[Claims] A fluid is filled between a housing and a rotating shaft having at least two fluid chambers inside the housing and having a rotatable vane, and a fluid is filled between the housing and the rotating shaft. A rotary damper having damping force generating means for generating a damping force with respect to relative rotation between the housing and the rotation shaft by restricting the flow of fluid between the two fluid chambers; Between the outer surfaces of both side walls of the housing to be pivotally supported and the outer peripheral surface of the rotating shaft, the outer peripheral edges thereof are fixed to the outer surfaces of both side walls, respectively, and the inner peripheral edges are respectively fixed to the outer peripheral surfaces of the rotating shaft. A rotary damper provided with an elastic plate. 2. A reservoir chamber for absorbing expansion and contraction of a fluid filled in each of the two fluid chambers due to a temperature change is formed between both outer side surfaces of the side walls of the housing and the respective elastic plates. The rotary damper according to claim 1, wherein 3. The rotary damper according to claim 2, wherein a pressure reducing mechanism is provided in a flow path communicating between each of the reservoir chambers and each of the two fluid chambers. 4. An adhesive between an outer peripheral portion of each of said elastic plates and an outer surface of each of said side walls and / or an inner peripheral portion of each of said elastic plates and an outer peripheral surface of said rotating shaft. The rotary damper according to claim 1, wherein: 5. A fastening member for fastening between an outer peripheral edge of each of said elastic plates and an outer surface of each of said side walls and / or an inner peripheral edge of each of said elastic plates and an outer peripheral surface of said rotating shaft. The rotary damper according to claim 1, wherein the rotary damper is fixed. 6. An elastic groove is provided on the outer surface of each of the side walls and / or the rotation shaft, and fitted into the outer peripheral edge and / or the inner peripheral edge of each of the elastic plates in the annular groove. 4. The fixing device according to claim 1, wherein a portion between the outer peripheral portion of the plate and the outer surface of each side wall and / or a portion between the inner peripheral portion of each of the elastic plates and the outer peripheral surface of the rotating shaft are fixed. A rotary damper as described in Crab.