JPH11159561A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily form a first and second passages to interconnect liquid chambers, making a pair, in other part than an input output shaft. SOLUTION: Vanes 14A and 14B fixed on an input output shaft 3 are contained in a pressure chamber in a damper housing 2 and the internal part of the pressure chamber is partitioned into liquid chambers 20a and 20b, and 21a and 21b. Plates 37 and 38 are nipped between a housing body 4 and a side cover 6, of which the damper housing 2 consists. Continuity holes 42-45 corresponding to respective liquid chambers are formed in a plate 37 on the housing body 4 side. A slit 46 to intercommunicate continuity holes 44 and 43 and a slit 47 to intercommunicate the continuity holes 42 and 45 are formed in a plate 38 on the side cover 6 side. First and second passages to intercommunicate the liquid chambers, making a pair, consist of the continuity holes 44 and 43 and the slit 46 and the continuity holes 42 and 45 and the slit 47, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper used as a shock absorber for a suspension link of an automobile and other rotating devices.

[0002]

2. Description of the Related Art As this kind of rotary damper, for example, one disclosed in Japanese Patent Application Laid-Open No. 9-79301 has been proposed.

[0003] In this rotary damper, an input / output shaft is rotatably supported by a damper housing, and a substantially fan-shaped pressure chamber is formed at a position symmetrical with respect to the axis of the damper housing. The interior of each pressure chamber is separated into two liquid chambers by two vanes projecting from the input / output shaft. The liquid chambers that contract with the rotation of one side of the input / output shaft and the liquid chambers that expand are formed by a first passage and a second passage formed in the input / output shaft so as to cross the radial direction. The pair of liquid chambers connected by the first passage and the pair of liquid chambers connected by the second passage are connected by a communication passage having a pair of damping valves. One of the pair of damping valves is set so as to operate in accordance with the flow direction of the liquid in the communication path, so that the damping force is generated even when the input / output shaft rotates in any direction. Has become.

The damper housing of the rotary damper includes a housing body forming a pressure chamber, and a side cover closing an axial side of the housing body.

[0005]

However, the conventional rotary damper has a structure in which the first passage and the second passage connecting the pair of liquid chambers are formed in the input / output shaft. Processing is easier than when the first passage and the second passage are formed in the housing main body, but the input and output shafts cannot be hollow, resulting in an increase in weight and a rise in material costs. This causes a problem.

Accordingly, the present invention facilitates the first and second passages connecting the liquid chambers that contract when the input / output shaft rotates to one side and the liquid chambers that expand when the input / output shaft is turned to one side. Accordingly, it is an object of the present invention to provide a rotary damper that can be formed to have a hollow structure for the input and output shafts to reduce the weight and the manufacturing cost.

[0007]

Means for Solving the Problems As means for solving the above-mentioned problems, the invention according to the first aspect is characterized in that a plurality of pressure chambers are formed in a damper housing, and the pressure chambers are rotated by the pressure chambers. A plurality of vanes are connected and supported by a freely supported input / output shaft, and each vane is slidably accommodated in each of the pressure chambers.
The first and second passages respectively connect the first and second passages, which are separated from each other and contract with the rotation of one side of the input / output shaft of each pressure chamber.
A side of a housing body forming the plurality of pressure chambers in a rotary damper in which a set of liquid chambers connected by a passage and a set of liquid chambers connected by a second passage are connected by a communication passage provided with a damping valve; A part is closed with a side cover to form a damper housing, and two plates are superposed and interposed between the housing body and the side cover, and a plate on the housing body side of the two plates is Along with forming the through holes corresponding to the respective liquid chambers, the through holes corresponding to the liquid chambers that contract with the rotation of one side of the input / output shaft and the expanding liquid chambers are formed in the side cover-side plate. A pair of communication passages for communicating the corresponding conduction holes with each other are formed, and the first passage and the second passage are constituted by the conduction holes and the communication passages of the two plates. When the first passage and the second passage are formed, it is only necessary to form the conduction hole and the communication passage in two plates interposed between the housing body and the side cover by press molding, cutting, or the like, respectively. .

[0008] The invention described in claim 2 is the first invention.
In the invention described in (1), the communication passage formed on the side cover side is formed by the slit. in this case,
The communication path can be formed even if the thickness of the plate on the side cover side is reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
A description will be given based on FIG.

In the drawings, reference numeral 1 denotes a rotary damper according to the present invention, which is used for a rotation shaft of a suspension link or the like of an automobile. The rotary damper 1 rotates a damper housing 2 and an input / output shaft 3 relatively. The two members are coupled to each other, and generate a damping force with the flow of the liquid inside when the two members rotate relative to each other.

As shown in FIGS. 2 and 4, the damper housing 2 has a thick cylindrical housing body 4, a first side cover 5 and a second side cover 6 for closing both sides of the housing body 4. The input / output shaft 3 is inserted through the housing main body 4 and is turned around the side covers 5 and 6 on both sides via bearings 8. It is movably supported.

The input / output shaft 3 is, as shown in FIG.
The inner cylinder 9 and the outer cylinder 10 disposed on the outer peripheral side thereof are connected by a rubber elastic body 11 so that the micro-vibration input from the outside can be absorbed by the rubber elastic body 11. The boss 13 of the pressure receiving body 12 is fitted and fixed to the outer peripheral surface of the outer cylinder 10 at a substantially central portion in the axial direction.
The pressure receiving body 12 has a boss 1 as shown in FIGS.
3, a pair of vanes 14A extending in opposite directions from the outer periphery of
14B are integrally formed.

The housing body 4 has a pair of fan-shaped grooves 15a, 15b formed in the inner peripheral surface thereof along the axial direction symmetrically with respect to the center axis, and a pair of arcs adjacent to the grooves 15a, 15b. Boss portion 1 of pressure receiving body 12 on walls 16 and 17
3 are slidably fitted. These arc walls 16, 17
, A sealing member (not shown) is fitted and held, and the sealing member seals the space between the arc walls 16 and 17 and the boss portion 13. The grooves 15a and 15b form fan-shaped pressure chambers 18 and 19 between the side covers 5 and 6 on both sides and the boss 13, respectively.
Each of the vanes 14A, 14B of the pressure receiving body 12 is slidably accommodated in the pressure receiving body 9. Each of these vanes 14A,
As shown in FIG. 3, each of the pressure chambers 18 and 19 divides the interior of each pressure chamber 18 and 19 into two liquid chambers 20a and 20b, and 21a and 21b.
a and 20b, and a pressure difference is generated between each of 21a and 21b. In the following, for convenience of explanation, the pressure chamber located on the left side in FIG.
The pressure chamber located on the right side is referred to as a right pressure chamber 19, the liquid chamber below the left pressure chamber 18 is referred to as a first left chamber 20a, and the liquid chamber above the left pressure chamber 18 is referred to as a second left chamber 20b. Room 19
The upper liquid chamber is the first right chamber 21a, and the lower liquid chamber is the second right chamber.
It shall be called the chamber 21b.

The two grooves 15 of the housing body 4
A volume compensator 22 is provided at a position circumferentially adjacent to a and 15b for compensating for a volume change of the liquid in the pressure chambers 18 and 19 due to a temperature change. As shown in FIG. 2, the volume compensating device 22 includes a sealing plug 2 at one end of a housing hole 23 formed in the housing body 4 along the axial direction.
4 and a piston 25 are accommodated, and a space between the sealing plug 24 and the piston 25 is a gas chamber 26. The sealing plug 24 is fixed to one end of the receiving hole 23, and a piston 25 is slidably fitted in the receiving hole 23, and the piston 25 moves the inside of the receiving hole 23 into the gas chamber on the side of the sealing plug 24. 26 and a reservoir chamber 27 at the other end, into which the liquid is introduced, and the free volume change of the reservoir chamber 27 is controlled by the gas chamber 2.
6 is allowed by the elasticity of the gas.
The sealing plug 24 is provided with a positioning pin 28 projecting through the second side cover 6, and the positioning pin 28 has a built-in gas sealing valve 29 for sealing gas into the gas chamber 26. Have been.

Further, stepped reduced diameter portions 30 are formed at both ends in the axial direction of the housing body 4, and the cylindrical portions 31 formed on the first side cover 5 and the second side cover 6, respectively. Is fitted to the reduced diameter portion 30.

As shown in detail in FIGS. 1 and 4, five thin plates 32, 33, 34, 3 are provided between one end face of the housing body 4 and the first side cover 5.
5 and 36 are sandwiched and fixed in a superposed state, and two thin plates 37 and 38 are similarly sandwiched and fixed between the other end surface of the housing body 4 and the second side cover 6 in a superposed state. ing. These thin plates 32 to 38 are all formed in an annular shape having substantially the same outer diameter as the reduced diameter portion 30 of the housing main body 4, and the side covers 5 and 6 are fitted to both ends of the housing main body 4. 5,6
Is housed inside the cylindrical portion 31.

Hereinafter, the structure of each of the plates 32 to 38 will be described. The five plates 32 to 36 on the first side cover 5 side are arranged in order from the left side in FIG.
Second plate 33, third plate 34, fourth plate 3
5, the fifth plate 36, and the plates 37 and 38 on the second side cover 6 side are called the sixth plate 37 and the seventh plate 38 in order from the right side in FIG. Also,
Each of the plates 32 to 38 is connected to each of the liquid chambers 20 of the housing body 4.
a, 20b, 21a, and 21b, each of which has a characteristic structure in each of the quarter regions in the circumferential direction. For convenience of explanation, the region corresponding to the left first chamber 20a of each of the plates 32-38 is represented by L.
-1 area, an area corresponding to the left second chamber 20b is called an L-2 area, an area corresponding to the right first chamber 21a is an R-1 area,
An area corresponding to the right second chamber 21b is called an R-2 area.

The L-2 region and the R-1 region, and the L-1 region and the R-2 region of the first to fourth plates 32 to 35 have the same structure. Has a passage T1 having _one end communicating with the left second chamber 20b and one end having the right first chamber 2b.
With passage T ₂ communicating are respectively formed in 1a, prevents the flow of direction of the liquid flowing into each chamber 20b, to 21a,
And a damping valve 3 that imparts passage resistance to the liquid and generates a damping force when the liquid flows out of each of the chambers 20b and 21a.
9 are provided. Also, the first to fourth plates 32 to
One end is located in the left first chamber 20a in the 35 L-1 and R-2 regions.
To the passage T ₃ communicating, with passage T ₄ having one end communicating with the right second chamber 21b are respectively formed, each chamber 20a, 21
A check valve 40 is provided to allow the flow of the liquid in the direction flowing into b.

The fifth plate 36 has passages T ₁ -T ₁ .
Arcuate slit 41 crossing of T ₄ is formed,
The slit 41 forms a connection path that connects all the paths T _{1 to} T ₄ with the end face of the first side cover 5.

Further, the housing body 4 is located at the boundary between the L-1 area and the R-2 area of the first to fourth plates 32-35.
A passage T communicating the reservoir chamber 27 with the slit 41
₅ is formed, the reservoir chamber 27 is adapted to conduct a low-pressure side of the damping valve 39 through the passage T _5.

On the other hand, the L-2 and R-
Conducting holes 42, 43, 44, 45 communicating with the respective liquid chambers 20b, 21a, 20a, 21b of the housing body 4 are formed in the respective areas 1, 1, L-1, R-2. Are formed with slits 46 and 47 as a pair of communication paths so as to connect the conduction holes 44 and 43 and 42 and 45 at diagonal positions of the sixth plate 37, respectively. The slits 46 and 47 are formed in substantially arc shapes having different diameters so that they do not cross each other.
And the passage holes 44 and 4 at diagonal positions
3, 42 and 45 are respectively connected. Therefore, the left first chamber 20a and the right first chamber 21 at the diagonal positions
a, the left second chamber 20b and the right second chamber 21b are connected to the conduction holes 42 to 45 of the sixth and seventh plates 37 and 38 and the slits 46 and
47 communicate with each other, each of which functions as a set of liquid chambers.

For this reason, if the vanes 14A and 14B are now rotated counterclockwise in FIGS. 1 and 3 with respect to the damper housing 2, the liquid inside the first left chamber 20a and the right first chamber 21a is assumed. Are pressurized, and the liquid inside these is R-1
At the same time the passage T ₂ by opening the damping valve 39 in the region when entering the slit 41 of the fifth plate 36, right second chamber from the passage T ₄ liquid in the slit 41 opens the check valve 40 of the R-2 region 21b and the left second chamber 20b. At this time, a damping force is generated in the damping valve 39 in the R-1 region. On the other hand, when the vanes 14A, 14B rotate clockwise in FIGS. 1 and 3 with respect to the damper housing 2, the liquid inside the left second chamber 20b and the right second chamber 21b is pressurized. these internal liquid L-2 regions fifth plate from the passageway T ₁ by opening the damping valve 39 of 3
6 and at the same time, the slit 4
The liquid in 1 opens the check valve 40 in the L-1 region and flows into the first left chamber 20a and the right first chamber 21a. At this time, a damping force is generated in the damping valve 39 in the L-2 region.

In this embodiment, the conductive holes 44,
43 and slit 46, conduction holes 42 and 45 and slit 47
Constitute the first and second passages in the present invention, respectively,
₁ through T ₄ and the slit 41 constitute a communication passage in the present invention in which the first liquid chamber 20a, 21a of the pair and the second liquid chamber 20b, 21b set the connection.

The sixth plate 37 and the seventh plate 3
8 at the boundary between the L-2 area and the R-1 area.
8 are formed, and these positioning holes 48 are fitted into the positioning pins 28 of the sealing plug 24.

The housing body 4 and the first and second side covers 5 and 6 are inserted into the cylindrical case 7 with the plates 32 to 38 sandwiched therebetween. By squeezing, they are closely connected to each other.

Since the rotary damper 1 is configured as described above, when the input / output shaft 3 and the damper housing 2 rotate relative to each other, a damping force is generated in the damping valve 39 in the R-1 region or the L-2 region. With this damping force, vibration and shock in the rotating direction are buffered.

In the rotary damper 1, the first passage and the second passage connecting the diagonally positioned liquid chambers are interposed between the housing body 4 and the second side cover 6, as described above. 6th and 7th plates 37 and 38
Conduction holes 44, 43 and slit 46, conduction holes 42, 45
And the slit 47, the first
The passage and the second passage can be easily formed only by press-forming the two plates 37 and 38. Therefore, the formation of the first passage and the second passage is facilitated, so that manufacturing at low cost is possible.

The first passage and the second passage are arranged on the side of the housing body 4 in the axial direction in a superposed state.
Since the passages are formed in the plates 37 and 38, these passages do not occupy the space around the pressure chambers 18 and 19, and the diameter of the damper housing 2 can be reduced accordingly.

Further, since the rotary damper 1 does not form the first passage and the second passage in the input / output shaft 3 as described above, the input / output shaft 3 is formed in a cylindrical shape (hollow shape). Therefore, the weight of the input / output shaft 3 and the material cost can be reduced.

The embodiments of the present invention are not limited to those described above. For example, a concave groove may be formed by press molding or cutting without punching slits 46 and 47. Alternatively, the number of the pressure chambers may be three or more, or the vane may be directly fixed to the input / output shaft by welding.

[0031]

As described above, the invention according to claim 1 is
A side portion of a housing body forming a plurality of pressure chambers is closed with a side cover to form a damper housing, and two plates are interposed between the housing body and the side cover in a superposed manner. In the plate on the side of the housing main body, a conduction hole corresponding to each liquid chamber separated in the housing main body is formed, and in the plate on the side cover side, with rotation of one side of the input / output shaft, A pair of communication paths are formed to connect the communication holes corresponding to the contracting liquid chambers and the communication holes corresponding to the expanding liquid chambers, respectively. The liquid chambers are connected by the communication holes and the communication paths of the two plates. Since the first passage and the second passage communicating with each other are configured, the first passage and the second passage can be formed very easily in a portion other than the input / output shaft. As a result, the input / output shaft is hollow. It is possible to reduce the weight and manufacturing cost in the concrete.

Further, the invention described in claim 2 is the same as that in claim 1
In the invention described in (1), the communication path formed in the plate on the side cover side is formed by the slit, so that the communication path can be formed even if the thickness of the plate on the side cover side is reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of the embodiment, taken along line AA of FIG. 3;

FIG. 3 is a sectional view taken along the line BB of FIG. 2 showing the embodiment.

FIG. 4 is an exploded perspective view showing the same embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotary damper, 2 ... Damper housing, 3 ... Input / output shaft, 4 ... Housing main body, 6 ... Second side cover (side cover), 14A, 14B ... Vane, 18 ... Left pressure chamber (pressure chamber), 19 ... Right pressure chamber (pressure chamber), 20a left first chamber (liquid chamber), 20b left left chamber (liquid chamber), 21a right first chamber (liquid chamber), 21b right second chamber (liquid chamber) 37, a sixth plate (plate), 38, a seventh plate (plate), 39, a damping valve, 41, a slit (communication passage), 42, a conduction hole (second passage), 43, a conduction hole (first). Passage hole (first passage), 45 conduction hole (second passage), 46 slit (first passage), 47 slit (second passage), T _{1 to} T ₄ passage (continuous passage) aisle).

Claims (2)

[Claims] A plurality of pressure chambers are formed in a damper housing, and a plurality of vanes are connected and supported on an input / output shaft rotatably supported by the damper housing. The pressure chambers are slidably housed in the chamber, each of the pressure chambers is divided into two chambers, and the liquid chambers contract and expand with the rotation of one side of the input / output shaft of each pressure chamber. Are respectively connected by a first passage and a second passage, and a set of liquid chambers connected by the first passage and a set of liquid chambers connected by the second passage are connected by a communication passage provided with a damping valve. In the rotary damper, a side portion of a housing body forming the plurality of pressure chambers is closed with a side cover to form a damper housing, and two plates are interposed between the housing body and the side cover by overlapping. , These two A through hole corresponding to each of the liquid chambers is formed in a plate on the housing body side of the rate, and a liquid chamber that contracts with rotation of one side of the input / output shaft is formed in the side cover side plate. A pair of communication passages are formed to allow the communication holes to communicate with each other and the communication holes corresponding to the liquid chambers to be expanded, respectively, and the first and second passages are formed by the communication holes and the communication passages of the two plates. A rotary damper characterized in that: 2. The rotary damper according to claim 1, wherein the communication path is formed by a slit.