JPH07332421A - Rotational damper - Google Patents

Abstract

PURPOSE:To improve sealability in respect to gaps between opposed surfaces of a movable vane and a casing, and between opposed surfaces of an operations haft and a fixed vane. CONSTITUTION:A wane 4 fixed to a casing 2 is formed to be a sector which has an outer surface in contact with an inner peripheral surface of the casing, width such an extent that the inner surface is in contact with an outer peripheral surface of an operation shaft, and an inner arc whose length is one third of an outer periphery of a small diameter part 31. A movable vane 5 which is fixed to the small diameter part 31 of the operation shaft and rotated together with the operation shaft is formed to be a sector which has an outer surface in contact with the inner peripheral surface of the casing, width such an extent that the inner surface is in contact with the outer peripheral surface of the operation shaft, and an outer arc whose length is one third of the inner periphery of the casing. Either fixed vane 4 or movable vane 5 has a hollow structure. Liquid passing portions 52, 53 communicated with a hollow part 51 are formed on its both-side end walls in a circumferential direction. A valve member 6 is arranged inside the hollow part 51 for opening and closing the liquid passing portions 52, 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper for delaying the operation of a rotating object supported by an operating shaft or a casing.

[0002]

2. Description of the Related Art Generally, a piano, a record player,
Opening / closing lids of portable personal computers, copy machines and other office equipment, toilet seats and toilet lids of western-style toilets have one end supported by a rotating shaft and the other end being a free end.
It is provided so as to be rotatable in the vertical direction within a range of a rotation angle of 0 to 120 °. In this way, the rotating object supported by the rotating shaft or hinge must be closed with the hand to the end when closing, and it will collide at the final point of the closing operation and generate a loud impact noise and cause damage. There was an inconvenience.

In view of such inconvenience, the diameter of the operating shaft insertion hole of the casing is set between the inner peripheral surface of the operating shaft insertion hole and the outer peripheral surface of the operating shaft when the operating shaft is inserted and disposed. A predetermined gap is formed on the inside of the casing, and the gap is partitioned by a partition wall (fixed vane) fixed to the inner peripheral surface of the casing, and further formed by the partition wall, the inner peripheral surface of the operating shaft insertion hole, and the outer peripheral surface of the operating shaft. Fill the liquid chamber with a viscous liquid,
A rotary damper having a movable vane that is fixed to the outer peripheral surface of the operating shaft and rotates together with the operating shaft is used. Then, when the object to be rotated is closed, the viscous liquid moves through a slight gap between the tip edge of the movable vane and the inner peripheral surface of the operation shaft insertion hole, or passes through a separately provided orifice. Then, the braking force works. When the object to be rotated is opened, a large amount of liquid moves from the through hole provided in the movable vane that is closed during the closing operation and opened during the opening operation, so that the opening operation can be easily performed.

[0004]

However, the movable vanes provided in such a rotary damper are usually thin plates, and the area of the facing surface between the movable vanes and the casing is small. Therefore, when the gap between the facing surfaces is used as an orifice, the size of the gap (distance between the facing surfaces) must be reduced in order to increase the viscous resistance, but there is a limit to reducing the size. . Further, when the orifice groove is separately provided, if the liquid leaks from the gap between the facing surfaces and the gap between the facing surfaces of the operating shaft and the fixed vane, the planned viscous resistance cannot be exhibited.

The present invention has been made in order to solve the above-mentioned problems, and improves the sealability of the gap between the facing surfaces of the movable vane and the casing and the gap between the operating shaft and the fixed vane to improve the viscous resistance. It is an object of the present invention to provide a rotary damper capable of increasing liquid leakage and reducing liquid leakage.

[0006]

In order to achieve the above-mentioned object, a rotary damper of the present invention has an operating shaft rotatably arranged relative to a casing, and a viscous liquid filled in the casing. In the rotary damper, the outer surface is in contact with the inner peripheral surface of the casing, the inner surface has a width such that it contacts the outer peripheral surface of the operating shaft, and the arc length of the inner surface is substantially one third of the outer peripheral surface of the operating shaft. A fan-shaped fixed vane fixed to the casing, and an outer surface of the vane fixed to the inner surface of the casing,
It has a width such that the inner surface contacts the outer peripheral surface of the operating shaft, and the arc length of the outer surface is formed into a substantially fan shape having a length of approximately 1/3 of the inner peripheral surface of the casing, and is fixed to the operating shaft to operate. A movable vane that rotates together with the shaft and a fixed vane or a movable vane are formed in a hollow shape, and liquid passage portions that communicate with the hollow portion are provided on both end walls in the circumferential direction of the liquid vane. And a valve member capable of opening and closing the passage portion.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the embodiments shown in the drawings. In FIG. 1, reference numeral 1 denotes a rotary damper of this embodiment, which is provided with a casing 2, an operating shaft 3, a fixed vane 4, a movable vane 5, and a valve member 6.

The casing 2 is formed in a substantially cylindrical shape with a bottom, and a part of the outer peripheral surface is cut out so as to form a flat portion 21.

The operating shaft 3 comprises a small diameter portion 31, a large diameter portion 32, and a protruding portion 33. The large-diameter portion 32 is formed to have an outer diameter such that the large-diameter portion 32 is in sliding contact with the inner peripheral surface of the casing 2.
Reference numeral 1 is formed with an outer diameter that allows a predetermined gap 7 to be formed between the inner peripheral surface of the casing 2. The large diameter portion 32 is located on the side of the opening 22 and the small diameter portion 31 is located on the side of the bottom wall portion 23 of the casing 2 so that the protruding portion 33 projects outward from the opening 22 of the casing 2. Are arranged as follows. A screw member 32a functioning as a cap is screwed around the large diameter portion 32, and when the screw member 32a is moved back and forth, the operating shaft 3 moves slightly along the axial direction. As a result, the gap between the end surface 31a of the small diameter portion 31 of the operating shaft 3 and the inner surface of the bottom wall portion 23 of the casing 2 can be adjusted, and the amount of movement of the viscous liquid can be controlled. An O-ring 32b for sealing is arranged around the large diameter portion 32 and at an appropriate position between the screw member 32a and the small diameter portion 31.

A narrowed portion 34 having a diameter smaller than that of the large diameter portion 32 is formed between the large diameter portion 32 and the projecting portion 33. Book click pins 34a and 34b are fixedly arranged. Further, on the inner peripheral surface of the casing 2, the click pins 34a, 3
Engagement grooves 24 and 25 are provided corresponding to 4b.

The fixed vane 4 has such a width that its outer surface contacts the inner peripheral surface of the casing 2 and its inner surface contacts the outer peripheral surface of the working shaft 3, and the arc length of the inner surface of the fixed vane 4 is the small diameter portion 31 of the working shaft 3. What is necessary is just to be formed in a substantially fan shape having a length of about 1/3 of the outer periphery of the above and fixedly arranged in the casing 2. In this embodiment, the fixed vane 4 and the casing 2 are integrally formed. The arc length of the inner surface is set to about 1/3 of the outer circumference of the small diameter portion 31, and the arc length of the outer surface of the movable vane 5 is set to about 1/3 of the inner circumference of the casing 2 as described later. In order to increase the area of the facing surface between the casing 2 and the movable vane 5 and the facing surface between the actuating shaft 3 and the fixed vane 4 and improve the sealing performance, the arc lengths of these arcs are made as large as possible while operating. This is for ensuring the rotation range of the shaft 2 of about 120 °.

The movable vane 5 has a width such that the outer surface contacts the inner peripheral surface of the casing 2 and the inner surface contacts the outer peripheral surface of the operating shaft 3, and the arc length of the outer surface is approximately 1 / the inner peripheral surface of the casing. It is formed in a substantially fan shape having a length of 3 and is fixed to the operating shaft 3 so as to rotate together with the operating shaft 3. In this embodiment, it is integrally formed with the operating shaft 3. The movable vane 5 has an opening on the bottom wall portion 23 side of the casing 2,
It is formed in a hollow body whose other end is closed, and a valve member 6 described later is disposed in the hollow portion 51. In addition, the hollow portion 51 and the gap 7 formed by the inner peripheral surface of the casing 2 and the outer peripheral surface of the small diameter portion 31 of the actuating shaft 3 are formed by notching both end walls in the circumferential direction of the movable vane 5. The liquid passage portions 52, 53 formed by

The valve member 6 is arranged in a hollow portion 51 formed in the movable vane 5. Specifically, the width (the length along the radial direction from the axial center of the operating shaft 3 toward the outer peripheral surface) is substantially the same as the width of the hollow portion 51, and the curved portion is formed to have the circumferential length. The length of the hollow portion 51 is shorter than the circumferential length thereof, and the length along the axis of the actuating shaft 3 is longer than the length along the axis of the liquid passage portions 52, 53 (see FIG. 4).
The movable vane 5 is located on the front side in the flow direction of the viscous liquid when the operating shaft 3 rotates in the closing direction, that is, in the present embodiment.
Since the valve member 6 is disposed on the other side of the movable vane 5, the spring 8 that presses so as to normally close one liquid passage portion 52 located on the rear side in the rotation direction of the movable vane 5 is connected to the valve member 6 and the other. And the liquid passage portion 53 of As shown in FIG. 4, the spring 8 is bent in a substantially L-shape as a whole, and its long side portion is further bent in an inverted V shape, and a portion 81 bent in the inverted V shape. In the valve member 6, the inclined surface 61, which is formed by cutting out a corner portion of the valve member 2 near the opening portion 22, is arranged to abut.

Here, it is preferable that the valve member 6 is provided with an overload countermeasure structure in consideration of the case where an overload is applied during rotation in the closing direction. In this embodiment, as the overload countermeasure structure, as shown in FIG.
In addition, the hollow portion 62 that opens to the bottom wall portion 23 side of the casing 2
And a plate spring 63, which is curvedly arranged in the hollow portion 62 and exerts an urging force outward, and one liquid passage portion 52 located on the rear side when the operating shaft 3 rotates in the braking direction. A first communication hole 64 that communicates with the hollow portion 51 of the movable vane 5 on the side, and a second communication hole 65 that is formed at a position that substantially opposes the first communication hole 64 with the cavity 62 as a boundary. A structure having is used. The first communication hole 6
The diameter of 4 is larger than the width of the leaf spring 63, and the second communication hole 65
Is formed to be smaller than the width of the leaf spring 63, whereby the second communication hole 65 is normally closed, and only when an overload is applied when the operating shaft 3 rotates in the braking direction, the leaf spring 6
3 inclines inward against the biasing force, and the second communication hole 65
Is opened, and the viscous liquid can be passed through the first communication hole 64 toward the one liquid passing portion 52. Of course, the leaf spring 63 has an elastic force that does not bend inward under normal load.

The rotary damper 1 of this embodiment is used as follows. As shown in FIG. 5, the toilet lid 93 and the toilet seat 94 of the western-style toilet are arranged at two locations on both sides of the rotating base. Specifically, the projecting portion 33 of the operating shaft 3 of each rotary damper 1 is non-rotatably fixed to the bearing portions 91 and 92 attached to the toilet body. Then, the casing 2 of the one rotary damper 1 supports the toilet lid 93 in a freely rotatable manner, and also supports the toilet seat 94 so that the braking force of the one rotary damper 1 acts. On the contrary, the casing 2 of the other rotary damper 1 rotatably supports the toilet seat 94 and also supports the toilet lid 93 so that the braking force of the other rotary damper 1 acts.

In this state, for example, when the toilet lid 93 is closed from the open state, the rotary damper 1 operates as follows. That is, in the most open state, one side end surface of the movable vane 5 on the liquid passage portion 52 side is in contact with the side end surface of the fixed vane 4. When closed, the volume of one liquid chamber 71 formed by partitioning the gap 7 by the movable vanes 5 increases, and the volume of the other liquid chamber 72 decreases. As a result, the viscous liquid tries to move from the other liquid chamber 72 side to the one liquid chamber 71, but the other liquid passage portion 53 provided in the movable vane 5 is provided.
Since the viscous liquid flowing in from one of the liquid passage portions 52 is closed by the valve member 6, the one liquid passage portion 52 is closed.
It cannot move to one of the liquid chambers 71 through the through hole and moves from a slight gap between the outer surface of the movable vane 5 functioning as an orifice and the inner peripheral surface of the casing 2 (see FIG. 6). Therefore, the rotation of the operating shaft 3 (in this embodiment, the rotation of the casing 2 is fixed because the operating shaft 3 is fixed) is delayed by viscous resistance when the viscous liquid passes through this slight gap, and the toilet lid 93 is slowly closed. It works. At this time, a slight gap between the outer surface of the movable vane 5 used as the orifice and the inner peripheral surface of the casing 2 is a distance in the circumferential direction (that is, facing the inner peripheral surface of the casing 2) as compared with the conventional case. Since the area of the outer surface of the movable vane 5 is large, a large viscous resistance can be obtained even if the width of the gap is the same as the conventional one. In addition, since the area of the portion where the inner surface of the fixed vane 4 and the outer peripheral surface of the operating shaft 3 face each other is large, the amount of liquid that moves through the gap between the two is small and high sealing performance is obtained. To be It should be noted that although a slight gap formed by the facing portion between the inner surface of the fixed vane 4 and the outer peripheral surface of the operating shaft 3 can be used as an orifice, in this case as well, in the facing portion, Since the area is large, a large viscous resistance can be obtained.

On the other hand, when the toilet lid 93 is opened from the closed state, the rotary damper 1 of this embodiment operates as follows.
That is, in the closed state, the side end surface of the movable vane 5 forming the other liquid passage portion 53 is substantially in contact with the other side end surface of the fixed vane 4. When the viscous liquid is released from this state, the viscous liquid tends to flow from one liquid chamber 71 into the other liquid chamber 72. At this time, the viscous liquid flows as shown by the arrow in FIG. 7, passes through one liquid passage portion 52, and passes through the valve member 6
In order to press, the valve member 6 is separated from the one liquid passage portion 52, the one liquid passage portion 52 is opened, the viscous liquid flows into the hollow portion 51 of the movable vane 5, and the other liquid passage portion 52 is opened. It flows into the other liquid chamber 72 through the passage portion 53. The viscous liquid also flows into the other liquid chamber 72 through a slight gap between the outer surface of the movable vane 5 functioning as an orifice and the inner peripheral surface of the casing 2. Therefore, since a large amount of viscous liquid moves, the viscous liquid can be easily released without adding a large viscous resistance at the time of opening.

When the operating shaft 3 (casing 2 in this embodiment) rotates in the braking direction, that is, when the viscous liquid moves from the other liquid chamber 72 to the one liquid chamber 71, a load larger than a normal load is applied. 8 is applied, the liquid flowing in from the second communication hole 65 of the valve member 6 presses the leaf spring 63, inclining the leaf spring 63 inward, as shown in FIG. The hole 65 is opened so that the viscous liquid flows into the cavity 62 of the valve member 6, and further flows into the one liquid chamber 71 through the first communication hole 64 and the one liquid passage portion 52.
Therefore, a large load is applied to the valve member 6 so that the valve member 6 is not deformed or destroyed, and the overload can be released.

When the braking force is adjusted, as described above, the screw member 32a is advanced and retracted, and the clearance between the end surface 31a of the small diameter portion 31 of the operating shaft 3 and the inner surface of the bottom wall portion 23 of the casing 2 is set. This can be done by adjusting the size.

The rotary damper of the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the type in which a slight gap between the movable vane and the inner surface of the casing is used as an orifice, but an orifice groove may be formed on the inner surface of the bottom wall of the casing, The plate having the orifice groove may be arranged between the end surface of the operating shaft and the inner surface of the bottom wall of the casing. In this case, if the width of the orifice groove is formed so as to be gradually narrowed along the braking direction of the operating shaft, the braking force can be gradually increased.

Further, in the above-mentioned embodiment, the valve member of the movable vane is arranged. However, the fixed vane is provided with the hollow portion and the liquid passage portion similar to the above-mentioned embodiment, and the valve member is arranged. May be In this case, the liquid passage portion on the front side in the flow direction of the viscous liquid during rotation in the braking direction corresponds to the liquid passage portion located on the front side in the rotation direction of the movable vane.

[0022]

According to the rotary damper of the present invention, approximately 90-
Since the area of the facing surface between the movable vane and the casing and the area of the facing surface between the fixed vane and the operating shaft are maximized while ensuring the rotation angle of 120 °, the sealing property of the gap between these facing surfaces is improved. improves. Therefore, when these gaps are used as orifices, it is possible to obtain a large resistance, and when a separate orifice groove is provided, liquid leakage from other than the orifice groove is small.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a rotary damper according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a perspective view showing structures of a movable vane and a valve member of the same embodiment.

FIG. 5 is a view conceptually showing a state in which the rotary damper of the same embodiment is attached to a toilet bowl.

FIG. 6 is a view for explaining the movements of the movable vane and the valve member when the rotary damper according to the embodiment rotates in the closing direction.

FIG. 7 is a view for explaining the movements of the movable vane and the valve member when the rotary damper according to the embodiment rotates in the opening direction.

FIG. 8 is a diagram for explaining the movements of the movable vane and the valve member when an overload is applied when the rotary damper according to the embodiment rotates in the closing direction.

[Explanation of symbols]

 1 Rotational Damper 2 Casing 3 Operating Shaft 4 Fixed Vane 5 Movable Vane 6 Valve Member 7 Gap 71 One Liquid Chamber 72 The Other Liquid Chamber

Claims (5)

[Claims] 1. A rotary damper having an operating shaft rotatably arranged relative to a casing and a viscous liquid filled in the casing, wherein an outer surface is in contact with an inner peripheral surface of the casing and an inner surface is the operating shaft. Has a width such that it is in contact with the outer peripheral surface, and the arc length of the inner surface is formed into a substantially fan shape having a length of about 1/3 of the outer periphery of the operating shaft. It is formed in a substantially fan shape having a width such that it contacts the inner peripheral surface of the casing, the inner surface contacts the outer peripheral surface of the operating shaft, and the arc length of the outer surface is about 1/3 of the inner peripheral surface of the casing. A movable vane that is fixed to the operating shaft and rotates together with the operating shaft, and a fixed vane or a movable vane are formed in a hollow shape, and liquid passage portions that communicate with the hollow portion are provided in both end walls in the circumferential direction of the movable vane. The liquid passage part can be opened and closed by being installed in And a flexible valve member. 2. The rotary damper according to claim 1, wherein the movable vane is formed hollow, and the valve member is disposed in the hollow portion of the movable vane. 3. The valve member is urged by a spring so as to normally close the liquid passage portion located on the front side in the flow direction of the viscous liquid when rotating in the braking direction. Rotation damper. 4. The valve member has a hollow portion in which a leaf spring can be arranged, and is movable on the liquid passage portion side, which is located on the front side in the flow direction of the viscous liquid when rotating in the braking direction with the valve member as a boundary. First for communicating the hollow portion of the vane with the hollow portion
And a second communication hole formed at a position substantially opposite to the first communication hole with the hollow portion as a boundary, and the second communication hole is normally closed by the leaf spring, and the braking is performed. The rotary damper according to any one of claims 1 to 3, wherein the second communication hole can be opened to allow the viscous liquid to pass through the first communication hole when an overload is applied during directional rotation. 5. The working shaft is provided so as to be movable back and forth in the casing along the axial direction, and the size of the gap between the end face of the working shaft and the inner surface of the casing bottom wall can be adjusted. The rotary damper according to any one of the above.