JP3167174B2 - Rotary damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper.

[0002]

2. Description of the Related Art Generally, a piano, a record player,
Rotating lids for opening and closing portable personal computers, copy machines and other office equipment, and opening and closing lids for toilet seats and toilet lids in Western-style toilets, have one end base supported by a rotating shaft and the other end being a free end, and having a free end. It is provided to be rotatable up and down within a range of a rotation angle of about 120 degrees. However, when closing such a rotating lid, etc., if it is not closed with your hand, etc. to the end, it will be a free-falling rotating object, colliding at the final point of the closing rotation and generating a loud impact noise or In some cases, the rotating lid or the device body may be damaged. for that reason,
Means for disposing a rotation damper on the rotation base and delaying the closing operation is used. Conventionally, as such a rotary damper, a rotary damper having a structure in which a gap between double cylinders is filled with grease and rotational torque is reduced by utilizing the viscous resistance of the grease has been widely used.

[0003]

However, since such a conventional rotary damper only utilizes the viscous resistance of grease, a display device is incorporated in a toilet lid, a toilet seat, or a rotating lid that opens and closes. There is a problem that a predetermined resistance cannot be exerted on a heavy-weight opening / closing lid such as a laptop personal computer. Further, in such a case, when a predetermined resistance force is to be exerted only by grease, there is a problem that the rotary damper itself must be increased in size.

Further, the conventional rotary damper is provided so as to be connected to a rotary shaft such as each opening / closing lid. However, it is necessary to provide one rotary damper for one rotary shaft.
In the case of a toilet seat or a toilet lid of a Western-style toilet, it is necessary to dispose a rotary damper in connection with the rotation shafts of both the toilet seat and the toilet lid.
Therefore, a large installation space is required, and mounting work is troublesome because two rotary dampers need to be provided.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is compact and lightweight, and can exert an appropriate braking force even when an opening / closing lid such as a toilet lid or a toilet seat has a predetermined weight. The purpose is to provide a rotary damper. It is another object of the present invention to provide a rotary damper capable of causing a plurality of opening / closing lids to perform a slow motion with one rotary damper.

[0006]

In order to achieve the above-mentioned object, a rotary damper according to the present invention is fixedly disposed on an arbitrary stationary part, and has at least an inner peripheral surface forming a hollow part excluding the vicinity of a bottom wall part. A female case is provided, and a bottomed cylindrical main body case in which the inner peripheral surface near the bottom wall is formed in a smooth surface, and a distal end near the outer peripheral surface is formed in a smooth surface. And an outer diameter near the distal end formed in the shape of the smooth surface is slightly smaller than an inner diameter near the bottom wall of the main body case, and an outer peripheral surface excluding at least the vicinity of the distal end. Is provided with a multi-threaded male thread that is screwed with the female thread of the main body case, and is disposed so as to be able to reciprocate in the hollow portion of the main body case along the axial direction of the main body case by being rotated. And the viscous liquid filled and arranged, First and second liquid chambers formed in the hollow portion of the main body case with the piston as a boundary, a liquid passage hole formed in the piston so as to communicate the first and second liquid chambers, A valve member for closing the liquid passage hole when moving forward in the hollow portion of the case and closing the liquid passage hole when moving backward, and a rotating shaft for opening the liquid passage hole when moving backward. while being connected to a portion is engaged with the rear end portion of the piston, and a connecting member that can rotate the piston with rotation of the rotary shaft, the smooth surface shape of the main body case Formed into
Inner surface near the bottom wall and the smooth surface of the piston
The gap with the outer peripheral surface near the tip formed in the shape
It functions as a disk .

Further, the rotary damper of the present invention has a partition at a substantially central portion thereof, and has a mounting hole passing through the partition along a direction substantially perpendicular to the axial direction. Two hollow portions are formed on both sides of the partition portion, and each of the hollow portions is provided with an internal thread portion on an inner peripheral surface forming a hollow portion excluding at least the vicinity of the partition portion. A bottomed cylindrical main body case having an inner peripheral surface formed in a smooth surface shape, and a vicinity of a distal end portion of the outer peripheral surface formed in a smooth surface shape and a vicinity of a distal end portion formed in the smooth surface shape Is formed with an outer diameter slightly smaller than the inner diameter in the vicinity of the partition wall of the main body case, and at least on the outer peripheral surface excluding the vicinity of the front end portion, the multi-threaded male screw section is screwed with the female screw section of the main body case. Is provided, and each hollow part of the main body case is rotated by being rotated. Two pistons are disposed so as to be able to reciprocate along the axial direction of the main body case, and first and second pistons are formed in the respective hollow portions of the main body case that are filled with the viscous liquid and are arranged with each piston as a boundary. A second liquid chamber, a liquid passage hole formed in each piston so as to communicate the first and second liquid chambers, and a valve closing operation when the piston moves forward in the hollow portion of the main body case. A valve member that opens the liquid passage hole by opening the liquid passage hole when the liquid passage hole is moved backward, and is connected to an arbitrary rotation shaft, and a part of each of the valve members is connected to each piston. A main body having two connecting members that are engaged with a rear end and are capable of rotating the respective pistons as the respective rotation shafts rotate.
Partitions formed in a smooth surface in each hollow part of the case
Formed as a smooth surface on the inner peripheral surface and the above pistons
The gap with the outer peripheral surface near the tip is the orifice.
It is characterized by functioning .

[0008]

The rotating shaft of the opening / closing lid is connected to the connecting member. When the opening / closing lid is closed from the open state, the connecting member rotates and the piston whose rear end is engaged with a part of the connecting member also rotates. Since the outer peripheral surface of the piston is formed with a multi-threaded male thread that is screwed to the female thread of the main body case, the piston moves forward in the main body case as it rotates. At this time, the liquid passage hole formed in the piston is closed by the closing operation of the valve member.

Therefore, the piston enters the first liquid chamber formed between the tip of the piston and the inner surface of the bottom wall of the main body case, and is filled into the first liquid chamber. The viscous liquid passes through a gap formed between the outer peripheral surface of the piston and the inner peripheral surface of the main body case, and further passes through a first liquid passage gap formed between the internal thread portion and the external thread portion, and then passes through the piston. It moves to the second liquid chamber on the end side.

The piston slowly moves forward due to the viscous resistance and dynamic pressure resistance when the viscous liquid passes through the gap. Therefore, the rotation torque of the opening / closing lid is reduced, and the closing operation is delayed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary damper according to the present invention will be described below in more detail with reference to an embodiment shown in the drawings. In the drawing, reference numeral 1 denotes a rotary damper, which includes a main body case 2, a piston 3, first and second liquid chambers 4 and 5, a liquid passage hole 6, a valve member 7, a connecting member 8, and the like.

The main body case 2 is formed in a cylindrical shape with a bottom having a predetermined length, and an internal thread 2c is formed on an inner peripheral surface 2b forming a hollow portion. In order to increase the moving distance, the thread groove is cut into multiple threads. In addition, as shown in FIG. 1, if the shape of the screw groove and the screw thread is trapezoidal, the strength is excellent and the movement of the piston 3 described later is smooth. Further, the internal thread portion 2c is formed except at least near the bottom wall portion 2d,
The inner peripheral surface 2e near the bottom wall 2d where the female screw 2c is not formed is formed in a smooth surface. In this embodiment, the inner peripheral surface near the opening end 2f of the main body case 2 is also formed into a smooth surface so as to rotatably hold a connecting member 8 described later along the inner peripheral surface. 2g is a lid member for closing the opening end 2f.

A thread 3b is formed on the outer peripheral surface 3a of the outer circumferential surface 3a at a position where the piston 3 is screwed with the female thread 2c of the main body case 2. The piston 3 is disposed so as to be able to move forward and backward within the hollow portion of the main body case 2. . The external thread 3b is used for the screw
As in the case of c, a plurality of thread grooves are cut, and the thread grooves and the thread are formed in a trapezoidal shape. Male thread 3b
The position at which is formed only needs to correspond to the position at which the female thread portion 2c of the main body case 2 is formed, and the outer peripheral surface 3d near the distal end portion 3c of the piston 3 is the inner peripheral surface near the bottom wall portion of the main body case 2. It is formed in a smooth surface shape corresponding to the surface 2e.

The outer diameter of the outer peripheral surface 3d near the front end formed in a smooth surface is slightly smaller than the inner diameter of the inner peripheral surface 2e near the bottom wall of the main body case 2. A slight gap 3f is formed between the smooth outer peripheral surface 3d and the inner peripheral surface 2e. In the present embodiment, the gap 3f functions as an orifice for exerting dynamic pressure resistance and viscous resistance of the viscous liquid 9. The piston 3
Since the outer thread portion 3b and the female thread portion 2c of the main body case 2 function as a screw, a constant gap, that is, a first liquid passage gap 3g is naturally formed, and the gap functions as an orifice. The viscous liquid 9 having passed through 3f passes through the first liquid passage gap 3g.

The rear end 3h of the piston 3 is
As shown in FIG. 3, it is formed in a rectangular shape, and is non-rotatably engaged with a connecting member 8 described later. Further, the outer diameter of the outer peripheral surface on the side of the rear end 3h formed in the shape of a square is smaller than the inner diameter of the concave portion 8c of the connecting member 8, and the outer diameter is formed by the male screw portion 3b and the female screw portion 2c. A second liquid passage gap 3i for passing the viscous liquid 9 that has passed through the first liquid passage gap 3g is formed.

A first liquid chamber 4 in which a viscous liquid 9 such as silicon oil is filled inside the hollow portion of the main body case 2 and on the inner surfaces of the distal end portion 3c of the piston 3 and the bottom wall portion 2d of the main body case 2. Is formed, and a second liquid chamber 5 is formed on the rear end 3h side of the piston 3 between the piston 3 and a connecting member 8 described later.

The liquid passage hole 6 reduces the amount of liquid flowing from the second liquid chamber 5 to the first liquid chamber 4 in order to reduce the resistance of the viscous liquid 9 and facilitate the return operation (retreat movement) of the piston 3. The first liquid chamber 4 is provided so as to have a large volume.
The piston 3 is penetrated from the front end 3c to the rear end 3h so as to communicate with the second liquid chamber 5.

The liquid passage hole 6 has a large diameter hole 6a near the front end 3c of the piston 3 and a small diameter hole 6b near the rear end 3h. And
Inside the large-diameter hole 6a of the liquid passage hole 6, a ball-shaped valve member 7 which is in contact with the boundary between the small-diameter hole 6b and closes and opens the small-diameter hole 6b is provided. Reference numeral 7a denotes a holding member for holding the valve member 7 near the boundary between the large-diameter hole 6a and the small-diameter hole 6b. In the present embodiment, the length in the center in the longitudinal direction is larger than the diameter of the valve member 7. Also, a long slit-shaped through hole 7b is formed, and a cap-shaped one is fitted and fixed to the large-diameter hole 6a. However, the present invention is not limited to this, and may be a rod-shaped member that is bridged in the large-diameter hole 6a.

One end 8a of the connecting member 8 is located inside the main body case 2 and its peripheral wall 8b is slidably rotatable with respect to the inner peripheral surface 2b of the main body case 2 and is connected to the rear end 3h of the piston 3. A main body 8e disposed so that the other end 8d protrudes from the opening end 2f of the main body case 2;
And a cap portion 8f connected to a rotating shaft of an arbitrary opening / closing lid (see FIGS. 1 to 3). Reference numeral 8g denotes an O-ring provided between the main body 8e and the inner peripheral surface 2b of the main body case 2 for preventing liquid leakage.

The rotary damper 1 according to the present embodiment having the above configuration.
Is fixedly arranged at an arbitrary stationary part, and is arranged such that the connecting member 8 is connected to the rotating shaft of the opening / closing lid. Then, when the opening / closing lid is closed, the cap 8f and the main body 8e of the connecting member 8 connected to the rotation shaft of the opening / closing lid rotate. The rear end 3h of the piston 3 is formed in a square shape, and is engaged with the concave portion 8c of the connecting member 8 formed in a square groove shape, so that the piston 3 is rotated together with the connecting member 8. When the piston 3 is rotated, the male thread 3b is screwed into the female thread 2c of the main body case 2, so that the square rear end 3h of the piston 3 slides in the recess 8c of the connecting member 8. Then, it moves forward in the hollow portion 2b of the main body case 2 toward the bottom wall 2d of the main body case 2 (see FIG. 2).

At this time, the viscous liquid 9 in the first liquid chamber 4 flows into the large-diameter hole 6a of the liquid passage hole 6, and the second
In order to move to the liquid chamber 5 side, the valve member 7 is pressed against the boundary between the small diameter hole 6b and the large diameter hole 6a, and the small diameter portion 6b is closed. Therefore, the viscous liquid 9 in the first liquid chamber 4 is applied to the smooth outer peripheral surface 3 d near the tip of the piston 3.
The liquid flows into the second liquid chamber 5 through a small gap 3f formed by the inner peripheral surface 2e having a smooth surface near the bottom wall of the main body case 2. The forward movement of the piston 3 is delayed by the dynamic pressure resistance and the viscous resistance generated when the viscous liquid 9 passes through the gap 3f functioning as the orifice. As a result, the opening / closing lid to which the rotating shaft is connected to the connecting member 8 slowly closes. When the piston 3 slides in the direction of the bottom wall 2d, the second
The volume of the liquid chamber 5 increases. At the same time, the viscous liquid 9 that has passed through the gap 3f is placed in the second liquid chamber 5.
Are formed between the external thread portion 3b and the internal thread portion 2c, the first liquid passage gap 3g, the outer peripheral surface of the rectangular rear end portion 3h of the piston 3, and the inner peripheral surface of the concave portion 8c of the connecting member 8. Flows into the second liquid chamber 5 through the second liquid passage gap 3i formed therebetween.

Further, as the piston 3 moves forward, it is formed by a smooth outer peripheral surface 3d near the tip of the piston 3 and a smooth inner peripheral surface 2e near the bottom wall of the main body case 2. Since the axial length of the slight gap 3f increases, the time for the viscous liquid 9 to pass through the gap 3f functioning as an orifice gradually increases. Accordingly, as the opening / closing lid approaches the vicinity of the final point of the closing operation, the rotational torque increases, and the resistance force of the viscous liquid 9 acting on the piston 3 gradually increases in response to the change in the rotational torque.

When an arbitrary opening / closing lid is opened, the piston 3 slides while rotating along the female screw portion 2c in the retreating direction (returning direction). Therefore, the volume of the second liquid chamber 5 formed between the concave portion 8c of the connecting member 8 and the rear end 3h of the piston 3 becomes smaller, and the second liquid chamber 5 becomes smaller.
The viscous liquid 9 filled in the liquid chamber 5 mainly flows into the liquid passage hole 6. And, the valve member 7 is attached to the holding member 7.
a, the liquid passage hole 6 is opened, and the viscous liquid 9 passes through the through hole 7b of the holding member 7a.
Flows into the first liquid chamber 4. Therefore, when the opening operation is performed, a large amount of the viscous liquid 9 flows through the liquid passage hole 6.
Flows, the resistance of the viscous liquid 9 hardly acts, and the opening operation is performed smoothly. In the present embodiment, since the external thread portion 3b and the internal thread portion 2c have a multi-start thread structure, when the piston 3 moves forward and backward, the axial movement distance caused by the rotation of the piston 3 is: , Relatively large.

FIGS. 4 and 5 show another embodiment of the rotary damper 1 according to the present invention. In the rotary damper 1 of the above embodiment, since only one set of the piston 3 and the connecting member 8 is provided in the main body case 2, only one rotating shaft of one opening / closing lid can be connected to the connecting member 8. Therefore, for example, in order to buffer the closing operation of both the toilet seat and the toilet lid of the Western-style toilet, it is necessary to provide two sets of the rotary dampers 1.

The rotary damper 11 of the present embodiment is a main body case 1
2, two sets of the piston 13 and the connecting member 18 are arranged, and the closing operation of both the toilet seat and the toilet lid can be delayed by simply disposing one fixedly on the immovable part of the Western style toilet. is there.

That is, the main body case 12 of the rotary damper 11 of this embodiment is formed in a substantially cylindrical shape as in the above embodiment, but has a partition wall 12d at a substantially central portion. Therefore, on both sides of the partition wall 12d, two hollow portions in which the female screw portions 12c are formed as in the above-described embodiment are formed. At a substantially central portion of the main body case 12, that is, at a position where the partition wall 12d is formed, a through hole 12g is formed from the outer peripheral surface of the main body case 2 so as to penetrate the partition wall 12d in a direction substantially orthogonal to the axial direction. ing.
The main body case 12 is fixed to an arbitrary immovable part by inserting a detent pin (not shown) through the through hole 12g.

Each of the two hollow portions has a piston 13 having a male thread portion 13b and two connecting members 18 which engage with the rear end portion 13h of each piston 13.
For example, those having the same structure as the above embodiment are provided.

In the rotary damper 11 according to the present embodiment, a detent pin is inserted into a through hole 12g of the main body case 12, and is fixed to, for example, a stationary part of a Western-style toilet. The rotating shaft of the toilet seat is connected to one connecting member 18 and the other connecting member 1
8 is connected to the rotating shaft of the toilet lid. Thereby, when each of the toilet seat or the toilet lid performs the closing operation, similarly to the above-described embodiment, each piston 13 is connected to the female thread portion 12 of the main body case 12.
It slides in the direction of the partition 12d while rotating along c. Therefore, the viscous liquid 19 moves from the first liquid chamber 14 to the second liquid chamber 15 and the gap (orifice) 1
Since the vehicle passes through 3f, a predetermined braking force is exerted by the dynamic pressure resistance and the viscous resistance generated at the time of the passage, and the closing operation of the toilet seat or the toilet lid is delayed.

When the toilet seat or the toilet lid is opened, each piston 13 slides while rotating in the return direction as in the above embodiment. Therefore, similarly to the above-described embodiment, the volume of each second liquid chamber 15 decreases, and the viscous liquid 19 filled in the second liquid chamber 15 presses the valve member 17 to open the valve. Liquid passing hole 1
The liquid flows into the first liquid chamber 14 through 6.

The main body case 12 having two hollow portions on both sides around the partition wall 12d may be formed by integral molding. However, as shown in FIG. May be. That is, the first main body case 20 and the second main body case 21 each having a bottomed cylindrical shape are formed, and the bottom walls of both are connected and fixed, and each of the bottom wall portions 20d, 21d is formed by the partition wall 12d. Performs the same function as.

The connecting means is not particularly limited, but it is necessary to provide through holes in the bottom walls 22d and 21d which function as the partition 12d. Projection 2 on the outer surface of the bottom wall 20d as
0f is projected, and a first through-hole 20g penetrates the projection 20f in a direction substantially orthogonal to the axial direction.
Is formed as a second main body case 21 on the outer surface of a bottom wall 21d, a concave portion 21f in which the projection 20f is fitted is formed, and a shaft is formed on a peripheral wall portion forming the concave portion 21f. It is preferable to use one in which the second through-hole 21g is formed along a direction substantially perpendicular to the direction.

According to this configuration, the first main body case 2
Since the 0 and the second main body case 21 can be molded separately, molding is easy. When fixed to an arbitrary fixed part, the first through-hole 20g and the second through-hole 21g are fitted so as to communicate with each other, and these through-holes 20g, 21g
It is sufficient to insert a pin for rotation prevention into the hole and fix it.

[0033]

The rotary damper according to the present invention has a structure in which the rotating operation is delayed by moving the piston forward and backward while rotating in the hollow portion, so that a large resistance force is generated even if the size is small. Can be. Therefore, even when the opening / closing lid is heavy and generates a large rotational torque, it is possible to absorb the impact at the end of the closing rotation.

Further, according to the aspect in which two pistons are loaded in the main body case, the closing operation of the plurality of opening / closing lids can be delayed only by providing one rotary damper. The installation space is small and the installation work is easy.

[Brief description of the drawings]

FIG. 1 shows a state before a piston starts to move forward.
FIG. 3 is a cross-sectional view showing one embodiment of the rotary damper of the present invention.

FIG. 2 is a sectional view showing an embodiment of the rotary damper of the present invention when the piston moves forward by a predetermined amount.

FIG. 3 is a sectional view taken along the line AA of FIG. 1;

FIG. 4 is a cross-sectional view showing another embodiment of the rotary damper of the present invention in which two pistons are loaded in a main body case.

FIG. 5 is a view showing another embodiment of the present invention in which
FIG. 6 is a partial perspective view showing one embodiment of a connecting means when one is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary damper 2 Main body case 2c Female thread part 3 Piston 3b Male thread part 3f Gap (orifice) 4 First liquid chamber 5 Second liquid chamber 6 Liquid passage hole 7 Valve member 8 Connecting member 9 Viscous liquid 11 Rotary damper 12 Body case 12g Through hole 13 Piston 14 First liquid chamber 15 Second liquid chamber 16 Liquid passage hole 17 Valve member 18 Connecting member 19 Viscous liquid 20 First body case 20f Projection 20g First through hole 21 Second Body case 21f concave portion 21g second through hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-59572 (JP, A) JP-A-63-67437 (JP, A) JP-A-63-13927 (JP, A) 52233 (JP, A) JP-A-2-274216 (JP, A) JP-A-4-161684 (JP, A) JP-A-5-157136 (JP, A) JP-A-6-33966 (JP, A) Japanese Utility Model Application Sho 51-126652 (JP, U) Japanese Utility Model Application Hei 1-86677 (JP, U) Japanese Patent Publication No. 26-5791 (JP, B1) Japanese Patent Publication No. 47-44951 (JP, B1) Japanese Public Utility Model No. 37-27884 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16F 9/14 E05F 3/10

Claims (3)

(57) [Claims] A female screw is provided on an inner peripheral surface of a hollow portion excluding at least a portion near a bottom wall, and an inner peripheral portion near the bottom wall is provided. A cylindrical main body case with a bottom surface having a smooth surface, a portion near the distal end portion of the outer peripheral surface having a smooth surface shape, and an outer portion near the distal end portion having the smooth surface shape. An outer thread whose diameter is slightly smaller than the inner diameter in the vicinity of the bottom wall of the main body case, and at least on the outer peripheral surface excluding the vicinity of the front end portion, is provided with a multi-threaded male thread that is screwed with the female thread of the main body case. A piston disposed so as to be able to reciprocate in the hollow portion of the main body case along the axial direction of the main body case by being rotated, and a viscous liquid filled and disposed. First and second boundaries formed in the hollow portion of the main body case as boundaries A liquid chamber, a liquid passage hole formed in the piston so as to communicate the first and second liquid chambers, and a valve closing operation when the piston moves forward in the hollow portion of the main body case to pass the liquid. A valve member that closes the hole and opens the liquid passage hole when retreating to open the liquid passage hole, and is connected to an arbitrary rotation shaft and partially engages with the rear end of the piston. , and a connecting member that can rotate the piston with rotation of the rotary shaft, smooth surface shape formed bottom wall portion near the main body case
The inner peripheral surface and the piston are formed into a smooth surface.
The gap with the outer peripheral surface near the tip is used as an orifice.
A rotary damper characterized by functioning . 2. A partition wall is formed substantially at the center, and has a mounting hole penetrating the partition wall along a direction substantially perpendicular to the axial direction, and both sides of the partition wall across the partition wall. To 2
The hollow portion is formed, and each of the hollow portions is provided with an internal thread portion on an inner peripheral surface forming a hollow portion except at least the vicinity of the partition wall portion, and the inner peripheral surface near the partition wall portion is formed in a smooth surface shape. A bottomed cylindrical main body case, and a portion near the tip of the outer peripheral surface is formed in a smooth surface shape, and an outer diameter near the tip portion formed in the smooth surface is a partition portion of the main body case. A multi-threaded portion is formed with an outer diameter slightly smaller than the inner diameter in the vicinity, and at least on the outer peripheral surface excluding the vicinity of the distal end portion, and is screwed with the female screw portion of the main body case, and is rotated. Thereby, two pistons are disposed in each hollow portion of the main body case so as to be able to reciprocate along the axial direction of the main body case, and the viscous liquid is disposed and filled. First and second liquids formed in each hollow portion A liquid passage hole formed in each piston so as to communicate the first and second liquid chambers; and when the piston moves forward in the hollow portion of the main body case, the valve is closed to operate the liquid passage hole. And a valve member for opening the liquid passage hole when retreating to open the liquid passage hole. Each of the valve members is connected to an arbitrary rotating shaft, and a part of each is connected to a rear end of each piston. And two connecting members capable of rotating the respective pistons with the rotation of the respective rotating shafts, and are formed in a smooth surface shape in the respective hollow portions of the main body case.
Inner peripheral surface in the vicinity of the partition wall and the smooth surface of each piston
The gap with the outer peripheral surface near the tip formed in the shape
A rotary damper characterized by functioning as a disk. 3. The first main body, wherein the main body case has a first projection provided on the outer surface of the bottom wall portion and having a first through hole penetrating in a direction substantially orthogonal to an axial direction of the projection. A second case in which a case and a concave portion on the outer surface of the bottom wall portion in which the protrusion is fitted are provided, and a second through hole is provided in a peripheral wall portion forming the concave portion in a direction substantially orthogonal to the axial direction. And the first through-hole and the second through-hole are aligned with each other, and the projection of the first body case and the recess of the second body case are fitted and fixed. The rotary damper according to claim 2, wherein