JP2001254773A - Rotation damper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation damper device reducing a manufacturing cost. SOLUTION: A first through hole 61 connecting a fluid chamber 51 and a receiving space 23d is formed in a fixed wall part 23b. A second through hole 62 connecting a fluid chamber 54 and the receiving space 23d is formed in a fixed wall part 23c. A first circulation path 71 connecting the fluid chamber 51 and the receiving space 23d is formed between the fixed wall part 23b and a rotor 3. A second circulation path 72 connecting the fluid chamber 54 and the receiving space 23d is formed between the fixed wall part 23c and the rotor 3. A movable wall part 23e is arranged in the receiving space 23d. The movable wall part 23e, when it butts against the fixed wall part 23b, closes the first circulation path 71 while opens the second circulation path 72, the movable wall part 23e, when it butts against the fixed wall part 23c, opens the first circulation path 71 while closes the second circulation path 72.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper device that can suppress the rotational speed of two members that rotate relative to each other at a low speed during relative rotation in at least one direction.

[0002]

2. Description of the Related Art A conventional rotary damper device of this type is disclosed, for example, in JP-A-10-169688. The rotary damper device includes an apparatus main body having an accommodation hole formed therein, and a rotor inserted into the accommodation hole so as to be rotatable relative to each other. Partition walls are formed in the apparatus main body and the rotor, respectively. Then, an annular space between the inner peripheral surface of the storage hole and the outer peripheral surface of the rotor is partitioned in the circumferential direction of the storage hole by these partition portions, and first and second fluid chambers are formed.

[0003] A partition formed in the main body of the apparatus has a pair of fixed walls formed on an inner peripheral surface of the accommodation hole and separated from each other in a circumferential direction thereof, and an accommodation hole formed in an accommodation space between the pair of fixed walls. And a movable wall portion movably provided in the circumferential direction. When the rotor relatively rotates in one direction, the movable wall is abutted against one fixed wall by the fluid in the second fluid chamber. In this state, since the communication path communicating between the first and second fluid chambers is blocked by the movable wall,
The fluid in the second fluid chamber flows into the first fluid chamber via an orifice such as a minute gap formed between the inner peripheral surface of the accommodation hole and the outer peripheral surface of the rotor. Therefore, the relative rotation between the apparatus main body and the rotor is suppressed to a low speed. On the other hand, when the rotor rotates in the other direction, the movable wall is abutted against the other fixed wall by the fluid in the first fluid chamber. In this state, the first and second fluid chambers communicate via the communication passage, and the fluid in the first fluid chamber flows to the second fluid chamber without resistance. Therefore, the rotor can relatively rotate at high speed.

[0004]

In the above-described conventional rotary damper device, when the rotation direction when the damper force acts is changed, the entire device must be changed.
Therefore, if a damper effect is required for each of two forward and reverse rotation directions, two types of casing and rotor must be prepared, and the number of types of parts increases, resulting in an increase in manufacturing costs. was there.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises an apparatus main body having an accommodation hole, and a rotor inserted into the accommodation hole so as to be relatively rotatable. The rotor is provided with partition portions each forming a plurality of fluid chambers by partitioning an annular space formed between an inner peripheral surface of the housing hole and an outer peripheral surface of the rotor in a circumferential direction, One partition portion is provided on one of the inner peripheral surface of the accommodation hole and the outer peripheral surface of the rotor and is provided with a pair of fixed wall portions provided apart from each other in a circumferential direction of the rotor. And a movable wall portion movably provided in a circumferential direction of the rotor in a storage space formed in the storage space, and communicates between the storage space and a fluid chamber adjacent to one fixed wall portion. A first communication path and a first inflow path are provided respectively. A second communication path and a second inflow path are provided between the space and the fluid chamber adjacent to the other fixed wall, and the first and second communication paths are normally open. When the movable wall portion abuts on the one fixed wall portion, the first inflow channel is closed, while the second inflow channel is opened, and the movable wall portion is connected to the other fixed wall portion. When hitting, the first
The inflow path is opened, the second inflow path is closed, and at least one of the first and second communication paths is provided with a resistance portion that generates resistance to the flow of fluid. It is characterized by.

In this case, it is desirable to provide the pair of fixed walls on the apparatus main body. The first communication passage has a first through hole that penetrates one fixed wall portion and communicates a fluid chamber facing the one fixed wall portion with the housing space. However, it is desirable to have a second through hole that penetrates the other fixed wall and communicates the fluid space facing the other fixed wall with the housing space. In the apparatus main body, first and second adjustment members operable from the outside thereof can be moved toward and away from openings of the first and second through holes facing the fluid chamber, respectively. The first and second adjusting members are provided so as to be close to the first and second through holes, so that the distal end of the first male screw member and the second male member are brought closer to each other. 1
It is desirable to form the resistance portion at least between the opening of the through hole and at least one of the end of the second male screw member and the opening of the second through hole. The first and second through-holes are formed in a line so that their axes are aligned with each other, and the first and second adjustment members are aligned with the first and second through-holes respectively. It is desirable that the first and second through holes are provided so as to be movable in the axial direction. It is desirable that the first and second adjustment members are screwed to the device main body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 is a front sectional view, FIG. 2 is a front view showing a part of the embodiment, and FIG. 3 is an exploded perspective view. . As shown in these drawings, the rotary damper device 1 of the present embodiment includes a casing (device main body) 2 having a housing hole 21 formed therein, and a rotor 3 rotatably inserted into the housing hole 21. ing.

[0008] One end of the receiving hole 21 is closed by a bottom (not shown), and the other end is open. As shown in FIG. 3, a sealing plate 41 is inserted into the opening of the housing hole 21 and is prevented from falling off by a bottom plate 42 fixed to the casing 2. A seal member (not shown) seals between the outer peripheral surface of the sealing plate 41 and the inner peripheral surface of the housing hole 21 and between the inner peripheral surface of the sealing plate 41 and the outer peripheral surface of the rotor 3. ing. Thus, an annular sealed space that is sealed from the outside is formed between the inner peripheral surface of the housing hole 21 and the outer peripheral surface of the rotor 3.

On the inner peripheral surface of the receiving hole 21 facing the closed space,
Two partition portions 22 and 23 are formed. The two partition walls 22 and 23 are arranged 180 degrees apart in the circumferential direction. Only one partition may be formed instead of the two partitions 22 and 23. One partition 22 is formed integrally with the casing 2, and has a tip end surface slidably in contact with the outer peripheral surface of the rotor 3. The other partition 23 will be described later.

Two partition walls 31, 32 are formed on the outer peripheral surface of the rotor 3 facing the closed space. The two partition portions 31 and 32 are arranged so as to be 180 ° apart from each other in the circumferential direction and to be located between the pair of partition portions 22 and 23. When only one partition part is formed in the casing 2, only one of the two partition parts 31 and 32 is formed.

The above-mentioned four partition portions 22, 23, 31, 32
Thus, the closed space is divided into four parts in the circumferential direction, and these are fluid chambers 51, 52, 53, and 54, respectively.
Each of the fluid chambers 51 to 54 is filled with a fluid such as a viscous fluid. As shown in FIG. 2, the fluid chambers 51 and 53 arranged diagonally with the center of the rotor 3 therebetween have an annular concave portion 33 and a notch 34 formed on one end surface of the rotor 3.
The fluid chambers 52 and 54 communicating with each other via the other diagonal line 34 are formed on the other end surface of the rotor 3 with annular recesses (not shown) similar to the recesses 33 and two. Three notches 35 (only one notch 35 is shown in FIG. 3)
Is communicated through. The recess 33 and the notch 3
4 is shielded by the bottom plate 41, so that the fluid chamber 5
1 and 53 are connected to the fluid chamber 5 through the recess 33 and the notch 34.
There is no communication with 2,54. Similarly, since the concave portion and the notch 35 formed on the other end surface of the rotor 3 are shielded by the bottom surface of the casing 2, the fluid chambers 52, 5
4 does not communicate with the fluid chambers 51 and 53 via the recess and the notch 35.

The partition 23 has a base 23a formed along the inner peripheral surface of the housing hole 21, a pair of fixed walls 23b and 23c formed at both ends of the base 23a, and a pair of fixed walls 23b and 23c. Housing space 23 formed between fixed wall portions 23b and 23c
d has a movable wall portion 23e movably arranged in the circumferential direction of the accommodation hole 21.

A first through hole 61 is formed in the fixed wall 23b. One end of the first through-hole (first communication passage) 61 is opened at an end face of the fixed wall portion 23b facing the fluid chamber 51. The other end of the first through hole 61 is fixed to the fixed wall 2.
The opening 3b is open at the end face facing the accommodation space 23b. Therefore, the fluid chamber 51 and the accommodation space 23d communicate with each other via the first through hole 61. Similarly, one end of the fixed wall portion 23c is opened at an end face of the fixed wall portion 23c facing the fluid chamber 54, and the other end portion is formed in the accommodation space 2 of the fixed wall portion 23c.
A second through-hole (second communication passage) 62 is formed at the end face facing 3b, and the fluid chamber 54 and the accommodation space 23b communicate with each other via the second through-hole 62. . The first and second through holes 61 and 62 are formed so that their axes are aligned with each other, and are connected to each other at the center of the base 23a. Therefore, when the first and second through holes 61 and 62 are formed by drilling, both of them are required to be 1 in size.
Drilling can be performed in the process.

The front end surface on the inner peripheral side of the fixed wall portion 23b is
It is spaced radially outward from the outer peripheral surface of the rotor 3, and a gap is formed between them. This gap forms the first flow passage 71. Therefore, the fluid chamber 51 and the accommodation space 23d communicate with each other via the first flow passage 71. Similarly, a second flow path 72 is formed between the fixed wall portion 23c and the rotor 3, and the second flow path 7
The fluid chamber 54 and the accommodation space 23d communicate with each other via the second member 2.

The width of the movable wall portion 23e in the circumferential direction of the housing hole 21 is smaller than the width of the housing space 23d in the same direction, and the movable wall portion 23e can move between the fixed wall portions 23b and 23c by the difference. ing. The movable wall portion 23e slidably contacts the outer peripheral surface of the rotor 3 and the inner peripheral surface of the base portion 23a. Therefore, as shown in FIG.
In a state where 3e abuts against the fixed wall portion 23c,
The second flow passage 72 is closed by the movable wall 23e. Conversely, when the movable wall 23e abuts on the fixed wall 23b, the first flow passage 71 is closed by the movable wall 23e.

A groove 23f is formed in the outer peripheral portion of the movable wall portion 23e so as to cross the accommodating hole 21 in the circumferential direction. The groove 23f is always in communication with the first and second through holes 61 and 62. Therefore, the first and second through holes 6
1, 62 are not closed by the movable wall 23e. Therefore, the fluid chamber 51 and the accommodation space 23d are always in communication with each other via the first through hole 61, and the fluid chamber 54 and the accommodation space 23d are always in communication with each other through the second through hole 62. In this embodiment, the first and second through holes 6
The inner peripheral side portions of the first and the second 62 extend from the base portion 23a to the accommodation space 23.
d, and since the first and second through holes 61, 62 are in communication with each other, it is not always necessary to form the groove 23f.

A screw hole 24 penetrating the first through hole 61 is formed in the wall of the casing 2 opposite to the first through hole 61. The screw hole 24 is arranged so that the axis thereof is aligned with the through hole 61. An adjusting member 81 is screwed into the screw hole 24. One end of the adjusting member 81 protrudes outside from the casing 2, and is connected to an operation handle 82 rotatably provided on the casing 2 so as to be non-rotatable and movable in the axial direction of the screw hole 24. I have. Therefore, when the operation handle 82 is rotated, the adjustment member 81 moves toward and away from the first through hole 61. When the adjusting member 81 is appropriately brought close to the first through holes 61, a narrow annular gap is formed therebetween. This gap serves as a resistance portion 91 that generates resistance to the flow of the fluid, and the magnitude of the resistance generated in the resistance portion 91 is adjusted by rotating the adjusting member 81 to appropriately change its position. Can be adjusted.

Similarly, a screw hole 25 whose axis is aligned with that of the second through hole 62 is formed in the wall of the casing 2 facing the second through hole 62. The adjusting member 83 is screwed. This adjusting member 83 is
By rotating the operation handle 84, it is possible to approach and separate from the second through hole 62, and by approaching the second through hole 62, a resistance portion similar to the above-described resistance portion 91 can be formed. However, in this embodiment, when the rotor 3 rotates in the direction of arrow X in FIG. 1, high-speed rotation is prevented, and when the rotor 3 rotates in the direction of arrow Y, high-speed rotation is allowed. The opening at 62 and the adjustment member 83 are sufficiently separated so that fluid can pass therebetween with little resistance. Since the inside diameters of the screw holes 24 and 25 are the same as those of the first and second through holes 61 and 62, the pilot holes of the screw holes 24 and 25 and the first and second through holes 61 and 62 are formed in one process. Can be drilled.

When the rotary damper device 1 having the above configuration is used, one of the two members that rotate relative to each other is non-rotatably connected to the casing 1 via protrusions 42a formed on the bottom plate 42. Then, the other member is non-rotatably fitted into the connection hole 35 of the rotor 3. For example, the casing 1 is non-rotatably connected to the toilet body, and the rotor 3 is non-rotatably connected to the toilet lid.

When the rotor 3 rotates in the direction of the arrow X in FIG. 1, the movable wall 23e is moved in the direction of the arrow X by the fluid in the fluid chamber 54 and hits the fixed wall 23b. In this state, the first flow passage 71 is moved by the movable wall 23e.
Closed by Therefore, the fluid in the fluid chamber 54 (including the fluid flowing into the fluid chamber 54 from the fluid chamber 52)
Flows into the first through-hole 61 through the second through-hole 62 and the second inflow path 72, and flows into the fluid chamber 51 therefrom. At this time, since the resistance portion 91 is formed between the first through hole 61 and the adjustment member 81, the high-speed rotation of the rotor 3 is prevented, and the speed is reduced to a low speed.

When the rotor 3 rotates in the direction of the arrow Y in FIG. 1, the movable wall 23e is moved in the direction of the arrow Y by the fluid in the fluid chamber 51 and hits the fixed wall 23c. In this state, the second flow path 72 is moved by the movable wall 23e.
Closed by However, the first flow passage 71 is opened. Therefore, the fluid in the fluid chamber 51 (including the fluid flowing into the fluid chamber 51 from the fluid chamber 53) flows through the first flow passage 71, the accommodation space 23d, the first through hole 61, and the second through hole 62. The fluid flows into the fluid chamber 54 via the At this time,
The adjusting member 83 is sufficiently separated from the second through-hole 62, and no resistance portion is formed between them. Therefore, the rotor 3 can freely rotate at high speed.

Further, the adjusting member 81 is sufficiently separated from the first through-hole 61 so as to eliminate the resistance portion 91 and to adjust the adjusting member 8.
If the resistor 3 is moved closer to the second through-hole 62 and a resistance portion is formed therebetween, high-speed rotation of the rotor 3 in the direction of the arrow X is allowed, and high-speed rotation of the rotor 3 in the direction of the arrow Y can be prevented. . Furthermore, by forming the resistance portion 91 and also forming the resistance portion between the adjusting member 83 and the second through hole 62, the rotor 3 can be rotated in any direction of the arrow X and Y directions. Can also prevent the high-speed rotation.

As described above, in the rotary damper device 1, the first and second through holes 61, which are the first and second communication passages,
62 and the first and second flow passages 71, 7
2, the provision of the two adjusting members 81 and 83 as in this embodiment can exert a damper effect in each of two forward and reverse rotation directions. And even if you do that,
It suffices to prepare only one type of the apparatus 1 as well as the casing 2 and the rotor 3. Also, the adjusting members 81, 8
If only one of the three is used, the screw hole 2
A device having the same configuration as that of the above-described device 1 is prepared except that the adjusting members 81 and 83 are not provided, and the screw hole 24 and the adjusting member 81 or the screw hole 25 and the adjusting member are adjusted according to the application. A member 83 may be provided. In any case, since only one type of the casing 2 and the rotor 3 is sufficient, the manufacturing cost can be reduced.

FIG. 4 shows another embodiment of the present invention. In the rotary damper device 1 'of this embodiment, the fixed walls 23b and 23c are relatively slidable on the outer peripheral surface of the rotor 3. Is contacted. In addition, the fixed wall 23
First and second flow holes (first and second flow paths) 73 and 74 are formed in b and 23c. Instead of the first and second flow holes 73 and 74, grooves may be formed on the contact surfaces of the fixed walls 23b and 23c with the rotor 3. First circulation hole 7
3, 74, when the movable wall 23e is in contact with the fixed wall 23b, the former is closed by the movable wall 23e, while the latter is opened and the movable wall 23e is in contact with the fixed wall 23c. The former is opened while the latter is closed. Therefore, the rotary damper device 1 'has the same operation and effect as the rotary damper device 1. Moreover, in the rotary damper device 1 ', the fixed walls 23b and 23c support the rotor 3 at a point-symmetric position with respect to the partition 22, so that the rotor 3 can be rotated smoothly.

FIG. 5 shows still another embodiment of the present invention, and a rotary damper device 1 "of this embodiment.
In the above, the fixed walls 23b and 23c are connected by a connecting wall 23g formed therebetween, and the connecting wall 23g also slidably contacts the outer peripheral surface of the rotor 3. Other configurations are the same as those of the rotary damper device 1 '. According to the rotary damper device 1 ″, the fixed wall portion 23
Since not only b and 23c but also the connecting wall 23g supports the rotor 3, the rotor 3 can be rotated more smoothly than the rotary damper device 1 '.

It should be noted that the present invention is not limited to the above embodiment, but can be changed as appropriate. For example, in the above-described embodiment, the partition 23 is fixed to the fixed wall 23.
Although the partition walls 31 and 32 are divided into a fixed wall portion and a movable wall portion, the partition wall portion 31 or 32 may be divided into a fixed wall portion and a movable wall portion.
In addition, although the axes of the adjustment members 81 and 83 are aligned with the axes of the first and second through holes 24 and 25, they need not always be aligned. Further, the fixed wall portions 23b and 23c are formed on the inner peripheral surface of the accommodation hole 21 via the base portion 23a.
It may be formed directly on the inner peripheral surface of the accommodation hole 21. Furthermore, the resistance portion 91 is formed by bringing the adjustment members 81 and 83 closer to the first and second through holes 61 and 62, but a part of the first and second through holes 61 and 62 has resistance. An orifice as a part may be formed.

[0027]

As described above, according to the rotary damper device of the present invention, a rotary damper device that exerts a damper effect when the rotor rotates in one direction, and a damper effect that rotates when the rotor rotates in another direction. With respect to the rotating damper device to be exerted, it is sufficient to prepare only one kind of the casing and the rotor, whereby the effect that the manufacturing cost of the rotating damper device can be reduced can be obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is a front view showing a part of the embodiment with a part omitted;

FIG. 3 is an exploded perspective view of the embodiment.

FIG. 4 is a sectional view similar to FIG. 1, showing another embodiment of the present invention.

FIG. 5 is a sectional view similar to FIG. 1, but showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary damper device 1 'Rotary damper device 1 "Rotary damper device 2 Casing (device main body) 3 Rotor 21 Housing hole 22 Partition wall 23 Partition wall 23b Fixed wall 23c Fixed wall 23d Storage space 23e Movable wall 31 Partition 32 Partition wall 51 Fluid chamber 52 Fluid chamber 53 Fluid chamber 54 Fluid chamber 61 First through-hole (first communication path) 62 Second through-hole (second communication path) 71 First flow path 72 Second Flow path 73 First flow hole (first flow path) 74 Second flow hole (second flow path) 81 Adjusting member 83 Adjusting member 91 Resistance section

Claims (6)

[Claims] 1. An apparatus main body having an accommodation hole, and a rotor rotatably inserted into the accommodation hole, wherein the apparatus main body and the rotor have an inner peripheral surface of the accommodation hole and the rotor. Partitions are provided to partition the annular space formed between the outer peripheral surface and the plurality of fluid chambers in a circumferential direction, and one partition is provided between the inner peripheral surface of the housing hole and the rotor. A pair of fixed wall portions provided on one of the outer peripheral surfaces and separated from each other in the circumferential direction of the rotor, and provided in a housing space formed between the pair of fixed wall portions so as to be movable in the circumferential direction of the rotor. A first communication path and a first inflow path are provided between the housing space and the fluid chamber adjacent to one of the fixed walls, respectively. There is no space between the accommodation space and the fluid chamber adjacent to the other fixed wall. A second communication path and a second inflow path are provided, respectively. When the movable wall portion abuts on the one fixed wall portion, the first inflow path is closed while the second inflow path is closed. When the inflow passage is opened and the movable wall portion abuts against the other fixed wall portion, the first inflow passage is opened, while the second inflow passage is closed, and the first and second inflow passages are closed. A rotary damper device, wherein at least one of the communication passages is provided with a resistance portion that generates resistance to the flow of the fluid. 2. The rotary damper device according to claim 1, wherein the pair of fixed walls are provided on the device main body. 3. The first communication passage has a first through-hole penetrating through one of the fixed walls and communicating the fluid chamber facing the one of the fixed walls with the housing space. The second communication passage has a second through hole that penetrates the other fixed wall and communicates the fluid space facing the other fixed wall with the housing space. The rotary damper device according to claim 2. 4. The apparatus main body has first and second adjustment members operable from the outside of the apparatus main body, respectively, approaching and separating from openings of the first and second through holes facing the fluid chamber. Movably provided so that the first,
At least one end of the second adjusting member is connected to the first,
By approaching the second through-hole, between the tip of the first male screw member and the opening of the first through-hole,
4. The rotary damper device according to claim 3, wherein the resistance portion is formed in at least one of a position between a tip end of the second male screw member and the opening of the second through hole. 5. 5. The first and second through-holes are formed in a line so that the axes of the first and second through-holes are aligned with each other, and the first and second adjustment members are formed in a line with the first and second through-holes. The rotary damper device according to claim 4, wherein the rotary damper device is provided so that the axes thereof are aligned with each other and is movable in the axial direction of the first and second through holes. 6. The rotary damper device according to claim 5, wherein said first and second adjusting members are screwed to said device main body.