JPH07119781A - Rotary damper - Google Patents

Abstract

PURPOSE:To obtain a large braking force in a small size by providing the first and the second partition walls to partition the inside of a casing into two liquid chambers; the first and the second elastic vane members bending in the rotating direction to require the braking force, and the front end edges are abutted to the inner surface of the casing; and liquid passing parts to the liquid chambers respectively. CONSTITUTION:By rotating an operating shaft 6 in the direction X, also elastic vane members 7 and 8 are rotated in the same direction, and the volumes of small liquid chambers and 52b are reduced by partition walls 3 and 4. In this case, the front end edges 7a and 8a of the elastic vane members 7 and 8 are abutted to the inner surface of a casing 2, and no clearance is generated between the casing 2 and the elastic vane members 7 and 8. An adhesive liquid in liquid chambers 51 and 52 flows from the small liquid chambers and 52b to the small liquid chambers 51a and 52a through liquid passing parts 23 and 24, and since the groove widths of the liquid passing parts 23 and 24 are made narrower gradually in this case, the braking force is increased gradually. When the operating shaft 6 is rotated in the direction Y, the adhesive liquid separates the front end edges 7a and 8a from the inner surface of the casing 2, and the operating shaft 6 is operated while receiving little resistance. Consequently, a large braking force can be obtained in a small size.

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.

[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 up-down direction within a range of front and rear rotation angles of 0 to 120 degrees. The door and the lid of the cooler box are supported at one end by a hinge. 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, Japanese Patent Laid-Open No. 4-337136 discloses the following rotary damper.

That is, as shown in FIG. 9, a disc portion for closing the opening of the casing 201, a tubular portion 203 projecting from the disc portion, a hollow portion 204a inside and a wall portion 204b. , 204c have valve holes 204d and 204e, and the partition wall portion 204 is provided so as to project on the outer periphery of the cylindrical portion 203.
A rotation control member 206 including a valve member 205 disposed in the hollow portion 204a of the partition wall portion 204 is loaded and disposed in the casing 201, and further, the disk portion and the peripheral wall portion of the casing 201. The liquid chamber 207 formed by the bottom wall portion and the bottom wall portion is filled with the damper liquid 208. Casing 20
1, the groove-shaped orifice 209 is further formed on the inner circumference of the No. 1 and the accumulator 211 is provided in the empty chamber 210 communicating with the liquid chamber 207. With this configuration, when the object to be rotated is closed, the valve member 205 closes the valve holes 204d and 204e, and a predetermined braking force acts.

[0004]

SUMMARY OF THE INVENTION Such a rotary damper is
Since the rotation operation is delayed by the liquid resistance received by the partition wall portion 204 of the rotation control member 206, it is ideal that there is no gap between the inner surface of the casing 201 and the partition wall portion 204 that is a member in contact with this. Is. However, if there is no gap between the two, frictional resistance will work, and the braking force will be larger than expected. To prevent this, the inner surface of the casing 201 and the partition wall 20 are usually used.
Although a very small gap is formed between the casing 201 and the partition wall 4, the dimensional accuracy of the casing 201 and the partition wall portion 204 must be made precise.

In addition, a braking force is exerted on a rotating object,
On the contrary, in order to prevent the braking force from acting when the object to be rotated rotates in the opening direction, the partition wall portion 204
Valve holes 204d and 204e are formed in the base plate, and a valve member 205 is arranged therein. Therefore, there is a problem that the structure is complicated and the manufacturing cost is high.

Further, in the above-mentioned one, since the portion receiving the resistance of the viscous liquid is one of the partition wall portion 204 and the valve member 205, a predetermined braking force is exerted when the torque of the rotating object is large. In this case, since the partition wall portion 204 and the like need to be large, the outer diameter of the casing 201 also becomes large, and as a result, the entire rotary damper becomes large.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotary damper which can be easily manufactured with a simple structure and can exert a large braking force even in a small size. And

[0008]

In order to achieve the above object, a rotary damper according to the present invention is a rotary damper having an operating shaft rotatably disposed relative to a casing via a viscous liquid. Since the gap formed by the inner surface and the peripheral surface of the actuating shaft is divided into two liquid chambers, the first and second partition portions provided at substantially opposite positions and the rotation direction in which the braking force needs to be exerted Has a width substantially the same as the axial length of each liquid chamber divided by the first and second partition portions,
First and second elastic vane members that protrude to the respective liquid chambers and are fixed to the actuating shaft so that the vicinity of the respective tip edges are in contact with the inner surface of the casing, and the first elastic vane member provided in the casing for each liquid chamber. And a second liquid passage portion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the embodiments shown in the drawings. 1 to 3 show a rotary damper 1 according to an embodiment of the present invention, which includes a casing 2, first and second partition walls 3, 4, an operating shaft 6, first and second elastic vane members 7, 8 is provided.

As shown in FIG. 1, the casing 2 is formed in a substantially cylindrical shape with a bottom, and a lid member 21 is attached to the one end opening 2a. The lid member 21 is formed in a substantially annular shape having a shaft insertion hole 21a at the center, and is held at a predetermined position by a retaining ring 21b. On the inner surface of the bottom wall portion 22 of the casing 2,
Liquid passing portions 23 and 24 are formed. The liquid passage portions 23, 24 are formed in a groove shape in which the width gradually becomes narrower in the rotation direction (X direction in FIG. 3) where the braking force needs to be exerted. As a result, as the object to be rotated rotates in the X direction, the liquid chambers 51 and 52, which will be described later, will be described.
In, the amount of movement of the viscous liquid between the small liquid chambers 51a and 51b or 52a and 52b formed by separating the elastic vane members 7 and 8 decreases, and the resistance received by the elastic vane members 7 and 8 increases.

The first and second partition portions 3 and 4 divide the gap 5 formed by the peripheral surface of the small diameter portion 61 of the actuating shaft 6 and the inner surface of the casing 2 into two liquid chambers 51 and 52. It is provided for the purpose of being formed, and is formed at a position substantially opposite to each other with the small diameter portion 61 interposed therebetween. In this embodiment, the first and second partition walls 3 and 4 are integrally molded with the casing 2 to form the liquid chamber 5
1, 52 have a length substantially the same as the longitudinal direction (axial direction), and the tip portions 3a, 4a are projected from the inner surface of the casing 2 so as to contact the peripheral surface of the small diameter portion 61 of the operating shaft 6. Alternatively, the separately-formed long plate member may be fixedly arranged at a predetermined position.

The actuating shaft 6 has a small-diameter portion 61 and a large-diameter portion 62 which are inserted into the casing 2, and as described above, the small-diameter portion 61 is provided between the peripheral surface of the small-diameter portion 61 and the inner surface of the casing 2. The diameter of the large diameter portion 62 is such that the gap 5 can be formed therein, and the peripheral surface of the large diameter portion 62 is formed so as to be in sliding contact with the inner surface of the casing 2. A sealing O-ring 62a for preventing leakage of the viscous liquid filled in the gap 5, that is, the liquid chambers 51, 52 is provided on the peripheral surface of the large diameter portion 62. The end portion 61a of the small diameter portion 61 of the operating shaft 6 is also supported by a bearing portion 22a formed on the bottom wall portion 22 of the casing 2.

The first and second elastic vane members 7 and 8 are
Each of the liquid chambers 51, 52 is fixed to the small-diameter portion 61 of the operating shaft 6 so as to have a width substantially equal to the axial length of each of the liquid chambers 51, 52 and project into each of the liquid chambers 51, 52.
52 are two small liquid chambers 51a, 51b and 52, respectively.
It is divided into a and 52b. As a means for fixing to the small diameter portion 61, a groove (not shown) may be provided in the small diameter portion 61, and the ends of the elastic vane members 7 and 8 may be fitted into the groove. As shown in FIG. 2, the small-diameter portion 61 is formed hollow, notches are formed along the axial direction at opposite positions of the small-diameter portion 61, and the central shaft portion 9 serves as the elastic vane members 7 and 8. And the elastic base members 7 and 8 are protruded from the opposing positions of the central shaft portion 9, the central shaft portion 9 is formed in the hollow portion of the small diameter portion 61, and The vane members 7 and 8 may be fitted in the notches of the small diameter portion 61.

Also, the first and second elastic vane members 7,
Reference numeral 8 is bent toward the rotational direction (X direction in FIG. 2) in which each of the front edges 7a, 8a is in contact with the inner surface of the casing and a braking force needs to be exerted in the middle thereof. This allows
When the operating shaft 6 rotates in the X direction, the viscous liquid pressure presses the vicinity of the tip edges 7a, 8a in the expansion direction,
When the tip edges 7a and 8a are pressed against the inner surface of the casing 2 and rotate in a rotation direction (Y direction in FIG. 2) where it is not necessary to exert a braking force, the viscous liquid is discharged from the small liquid chambers 51a or 52a to 51b or The casing 2 receives the pressure when moving to 52b and is pressed in the bending direction.
The tip edges 7a and 8a are separated from the inner surface of the.

The elastic material forming the first and second elastic vane members 7 and 8 used in this embodiment is a plate-like material made of synthetic rubber or plastic material, or a spring material such as a leaf spring. Can be used. Further, it is also possible to appropriately combine and use the above-mentioned materials, such as a plate-shaped plastic material to which a plate-shaped synthetic rubber is attached and a plate spring to which a plate-shaped synthetic rubber is attached. Further, the central shaft portion 9 and the first and second elastic vane members 7, 8
It is also possible to form an integrally molded body having different hardness between the and. For example, the hardness of the central shaft portion 9 can be increased, and the hardness of the first and second elastic vane members 7 and 8 can be reduced. In order to have such a configuration, for example, the central shaft portion 9 is first molded using a resin material having high hardness when solidified. At this time, the molding is performed using a mold having grooves on both sides of the central shaft portion 9. Next, the first and second elastic vane members 7 and 8 are molded so that the resin material having a low hardness when solidified is also filled in the groove of the central shaft portion 9.

Next, the operation of the rotary damper 1 of this embodiment will be described. First, the projecting working end 63 of the operating shaft 6 is connected to the rotary shaft of a rotary lid (not shown) of a laptop computer or the like. When this rotary lid is closed from the open state,
The rotating shaft (not shown) and the operating shaft 6 rotate in the arrow X direction in FIGS. The elastic vane members 7 and 8 also rotate in the same direction as the operation shaft 6 rotates. First and second
Since the first and second elastic vane members 7, 8 move without the partition walls 3, 4 of the liquid chambers 51, 52 moving.
At, the volume of one of the small liquid chambers 51b and 52b divided by the elastic vane members 7 and 8 becomes smaller. At this time, the pressure of the viscous liquid is applied to the elastic vane members 7 and 8 in the direction in which the leading edges 7a and 8a are brought into pressure contact with the inner surface of the casing 2. Therefore, no gap is created between the inner surface of the casing 2 and the elastic vane members 7, 8 in contact with the inner surface.

As the elastic vane members 7 and 8 rotate and move in the X direction, the viscous liquid contained in the liquid chambers 51 and 52 passes through the liquid passage portions 5 and 6, respectively, and one of the small liquid chambers respectively. 51b, 52b to the other small liquid chamber 51a,
Flows into 52a. Further rotation in the X direction causes the groove widths of the liquid passage portions 23 and 24 to gradually narrow, so that the amount of movement of the viscous liquid gradually decreases, and as a result, the braking force gradually increases.

After closing, when the rotary lid is opened, the actuating shaft 6 and the elastic vane members 7 and 8 rotate in the arrow Y direction. In this case, since the volume of the other small liquid chamber 51a, 52a in each liquid chamber 51, 52 becomes smaller, the viscous liquid moves to the one small liquid chamber 51b, 52b through the liquid passage portions 23, 24. To do. At this time, the viscous liquid presses the elastic vane members 7, 8 in a direction in which the leading edges 7 a, 8 a are separated from the inner surface of the casing 2. Therefore, the inner surface of the casing 2 and the tip edge 7 of each elastic vane member 7, 8 are
A gap is formed between a and 8a. Therefore, when the rotary lid is opened, a large amount of viscous liquid moves from the other small liquid chamber 51a, 52a to the one small liquid chamber 51b, 52b, so that the rotary lid or the like can be smoothly opened without receiving much resistance. To do.

FIG. 4 is a sectional view showing an application example of the rotary damper 1 of the present invention. Two rotary dampers 1, 1 are loaded in parallel in an outer casing 12 shown by an imaginary line, and The two protruding end portions 63, 63 are coaxially arranged. That is, the first gear 10 is fixedly arranged around the projecting portion 64 of the operating shaft 6 of the one rotary damper 1, and the second gear 11 is provided around the projecting portion 64 of the operating shaft of the other rotary damper 1. Is rotatably arranged independently of the protrusion 64. It should be noted that the second gear 11 is integrally provided with a connecting portion that functions as the projecting end portion 63 of the operating shaft 6 and that is connected to the rotating shaft of the rotating object. However, it goes without saying that the second gear 11 and the connecting portion functioning as the protruding end portion 63 may be molded and fixed separately.

Thus, when there are two independent rotating objects such as a toilet lid and a toilet seat of a Western-style toilet, the braking force can be exerted separately. Further, when the rotary dampers 1 and 1 are separately provided for the toilet lid and the toilet seat of the western-style toilet, the rotation centers of the toilet lid and the toilet seat are coaxial, so that they must be usually arranged in tandem. However, according to this example, since the projecting end portions 63, 63 of the operating shafts 6, 6 are coaxially arranged, the entire length in the longitudinal direction is one rotary damper.

5 and 6 show a rotary damper 100 according to another embodiment of the present invention. In the present embodiment, a casing having both ends opened is used as the casing 102 so that both projecting working ends 106c and 106d of the actuating shaft 106 can be projected from the both ends opening, and the both ends have lids each having a shaft insertion hole. This is a structure in which the member 102a and the bottom wall member 102b are mounted. Further, the diameter of the operating shaft 106 is formed to the extent that a predetermined gap 105 can be formed with respect to the inner surface of the casing 102, similarly to the small diameter portion 61 of the operating shaft 6 of the above-mentioned embodiment.
Rotors 106a and 106b, which are fixed to the operating shaft 106 and are formed so as to be in sliding contact with the inner surface of the casing 102, are disposed in the vicinity of both end openings of the casing 102 in the portion inserted into the casing 102.

Further, when the first and second elastic vane members 107 and 108 of this embodiment rotate in the direction in which the braking force is required to act, that is, in the X direction in FIG. 5, the first and second elastic vane members 107 and 108 are rotated. An overload coping means is provided so that the load applied to the elastic vane members 107 and 108 does not become excessive. That is, the first and second elastic vane members 107,
Through holes 107b for passing the viscous liquid,
108b is formed and the through holes 107b, 108 are formed.
The long plate-shaped valves 107c and 10 capable of opening b
8c is provided. The long plate-shaped valve 107
c and 108c are the first and second elastic vane members 10
7 and 108 are provided on the back side when rotating in the X direction, and one end is fixed to the elastic vane members 107 and 108 and the operating shaft 106. However, the valve 107
Needless to say, c and 108c are not limited to the long plate shape.

In the rotary damper 100 of this embodiment, the projecting action ends 106c and 106d are connected to the rotary lid of the laptop personal computer or the like applied in the above-mentioned embodiment, and the same operation is performed. However, in the case of the present embodiment, when the rotation torque when the rotary lid is closed is large, the valve 107c is opened so as to be pressed by the viscous liquid, and each liquid chamber 105 is opened.
The viscous liquid moves not only from the liquid passage portions (not shown) formed in a and 105b but also from the through holes 107b and 108b formed in the elastic vane members 107 and 108. Therefore, when the rotational torque is large, the load applied to each elastic vane member 107, 108 can be reduced, and the elastic vane members 107, 108 can be prevented from being deformed or broken.

In the above description, the rotary damper 1,
The case where 100 is attached to the rotary shaft of the rotary lid that rotates in the vertical direction has been described, but it is of course possible to apply it to the hinge 150 as shown in FIGS. 7 and 8.

[0024]

According to the rotary damper of the present invention, since two elastic vane members are arranged, a large braking force can be exhibited even if the size is small. Further, since the elastic vane member is made of an elastic material, when the operating shaft rotates in the direction in which the braking force is required to be exerted, the elastic vane member is pressed against the inner surface of the casing and comes into close contact therewith, except for the liquid passage portion. There is no movement of liquid from, and the braking force can be exerted reliably. On the contrary, when rotating in the direction in which it is not necessary to exert the braking force, a gap is formed between the elastic vane member and the inner surface of the casing, so that the rotating lid and the like can be easily opened. Further, since it has a simple structure, it can be manufactured at low cost, and since the elastic vane member is used, it is not necessary to make the dimensional accuracy of the casing or the like strict, and the manufacturing is easy.

[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 vertical cross-sectional view showing an application example of the rotary damper of the same embodiment.

FIG. 5 is a vertical sectional view showing another embodiment of the rotary damper according to the present invention.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a perspective view showing a hinge to which a rotary damper according to the present invention is applied.

FIG. 8 is a side view showing a hinge to which the rotary damper according to the present invention is applied.

FIG. 9 is a cross-sectional view showing a conventional rotary damper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary damper 2 casing 23 liquid passage part 24 liquid passage part 3 first partition wall portion 4 second partition wall portion 5 gap 51 first liquid chamber 52 second liquid chamber 6 working shaft 7 first elastic vane member 8 Second elastic vane member 100 Rotational damper 102 Casing 103 First partition wall portion 104 Second partition wall portion 105 Gap 105a First liquid chamber 105b Second liquid chamber 106 Working shaft 107 First elastic vane member 107b Through hole 107c valve 108 second elastic vane member 108b through hole 108c valve

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Claims (5)

[Claims] 1. A rotary damper having an operating shaft rotatably disposed relative to a casing via a viscous liquid, wherein a gap formed by an inner surface of the casing and a peripheral surface of the operating shaft is two liquids. In order to divide into chambers, the first and second partition portions provided at substantially opposite positions are bent from the middle toward the rotation direction in which the braking force needs to be exerted, and the first and second partition portions are provided. First and fixed to the operating shaft so as to have a width substantially the same as the axial length of each liquid chamber divided by the partition wall, project into each liquid chamber, and each tip edge vicinity is in contact with the inner surface of the casing. A rotary damper comprising: a second elastic vane member; and a liquid passage portion provided in a casing for each liquid chamber. 2. The rotary damper according to claim 1, wherein the first and second elastic vane members are made of synthetic rubber. 3. The rotary damper according to claim 1, wherein the first and second elastic vane members are made of a plastic material. 4. The rotary damper according to claim 1, wherein the first and second elastic vane members are made of a spring material. 5. The first and second elastic vane members,
5. A through hole is formed in each case, and a valve that can open the through hole when an overload is applied when rotating in a direction in which a braking force needs to be exerted is provided. The rotary damper according to any one of the above.