JPH10115338A - Rotating damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change the damping characteristic, by exchanging a spacer plate having an orifice formed by plural small pores formed at specific intervals within a range corresponding to a liquid passage of a covering member, for a spacer plate of different number of pores and/or different pore diameter. SOLUTION: A spacer plate 7 is installed inside of a covering member 6 in such manner that a rear face 71b is kept into contact with an upper edge face of a bulkhead part 21 of a casing 2, and an upper edge face of a wane body 41, and an orifice formed by plural pores 71a at specific intervals is formed on a range corresponding to a liquid passage 62b of the covering member 6. By making the diameters of the pores 71b gradually reduced toward a direction of higher damping force of the vane body 41, the higher damping force can be obtained in accordance with the rotation of the wane body 41. Plural spacer plates 7 of various kinds of orifices of different number and/or diameter size of the pores 71b, are prepared, so that the damping characteristic of the rotary damper can be changed only by exchanging the spacer plate.

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 rotation of a rotating lid or a door which is opened and closed by rotating.

[0002]

2. Description of the Related Art In general, the opening and closing lids of portable personal computers, copy machines and other office equipment, the opening and closing lids of pianos, the rotating lids and doors of toilet seats and toilet lids of Western-style toilets are supported at one end by a shaft. The other end is a free end, and is provided so as to be rotatable in a vertical direction or the like within a rotation angle range of about 0 to 120 degrees. When these revolving lids or revolving doors are closed, if they do not close with the hand until the end, the revolving lids and the like will collide with the main body at the final point of the closing rotation, causing loud impact noise and damage There are cases. For this reason, conventionally, a partition having a liquid passage hole is formed in a gap formed by the rotating shaft and the casing, and at the same time, a viscous liquid such as grease is filled so that the rotating lid or the like needs to exert a braking force. When rotating, the liquid passage hole is closed, and the viscous liquid is moved only by the orifice formed in the casing, so that a large resistance acts at that time,
When the rotating lid or the like is rotating in the opposite direction, a liquid damper that opens a liquid passage hole in the partition wall to move a larger amount of viscous liquid so that the resistance does not work much has become popular. I have.

[0003]

As described above, the rotary damper is driven by the viscous liquid passing through the orifice.
A predetermined braking force is applied. However, in the conventional rotary damper, the amount of the viscous liquid passing through the orifice is constant, and of course, the shape of the orifice is constant, and the braking characteristics of the rotary damper such as the position where the braking force becomes strong are also constant. is there. Therefore, once the rotary damper is manufactured, when it is actually applied to various rotating objects,
Even if the braking characteristics are inappropriate, such as the braking force being too strong, it cannot be easily adjusted, and there is no alternative but to use it as it is or replace it with a completely separately designed rotary damper.

In order to solve such a problem, the inventor of the present invention has proposed a bottomed substantially cylindrical casing provided with a partition portion protruding from an inner peripheral surface toward an axial center, and an axial center of the casing. A rotating shaft having an outer diameter such that the outer peripheral surface is in sliding contact with the distal end surface of the partition wall portion of the casing; and an outer peripheral surface of the rotating shaft projecting from the outer peripheral surface of the rotating shaft;
A vane member that rotates in accordance with the rotation of the rotating shaft in a liquid chamber filled with the viscous liquid partitioned by the inner peripheral surface of the casing and the partition wall portion. The lid member for closing the part comprises a lid body, an exchangeable spacer plate provided inside and having a choke groove formed on the back surface,
By replacing the spacer plate with a spacer plate having choke grooves having different dimensions, a rotary damper capable of varying braking characteristics is disclosed in Japanese Patent Application No. 7-3512.
No. 13 was proposed.

However, in order for the above-mentioned rotary damper to have an optimal braking characteristic adapted to a change in torque on the movable side as a shock absorber for various rotary lids or the like, a spacer plate having choke grooves having different dimensions is formed. Many kinds are necessary.
Generally, since these spacer plates are manufactured using a mold, it is necessary to prepare various kinds of molds, and there is a problem that the manufacturing cost is high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to vary braking characteristics such as the magnitude of braking force in accordance with a change in torque on the movable side of a rotating lid or the like. An object is to provide a low-cost rotary damper.

[0007]

In order to achieve the above object, a rotary damper according to the present invention comprises a bottomed substantially cylindrical casing having a partition part protruding from an inner peripheral surface toward an axial center. A rotating shaft disposed along the axial center of the casing and having an outer diameter such that the outer peripheral surface is in sliding contact with the distal end surface of the partition wall portion of the casing, and is provided on the outer peripheral surface of the rotating shaft,
A vane member which rotates in accordance with the rotation of the rotary shaft in a liquid chamber filled with a viscous liquid partitioned by the outer circumferential surface of the rotary shaft, the inner circumferential surface of the casing and the partition, and an upper surface of the casing While closing the opening, a lid member having an arc-shaped liquid flow path through which the viscous liquid passes on the lower surface,
A spacer plate disposed inside the lid member, wherein the spacer plate is replaceable, and a plurality of spacer plates are disposed at predetermined intervals within a range corresponding to the liquid flow path of the lid member. Having an orifice formed of formed small holes, and changing the braking characteristics by replacing the spacer plate with spacer plates having different numbers and / or diameters of the small holes forming the orifice. It is characterized by being able to.

[0008] The lid member may include a lid body and a liquid flow formed by a groove provided inside the lid body and formed in an arc shape on the back surface or a hole penetrating from the back surface to the surface in an arc shape. And a liquid flow path forming plate having a passage.

Further, the width of the liquid flow path of the lid member is formed to be the same width in the direction of exerting the braking force of the rotary shaft and the vane member, and constitutes an orifice formed in the spacer plate. It is preferable that the diameter of each small hole is gradually reduced in the direction in which the rotating shaft and the vane member exert the braking force.

The vane member may include a vane body,
The axial length is substantially the same as the vane body,
It is preferable that the vane body is configured to have a width along the circumferential direction larger than the radial end face of the vane main body, and a resin vane cover that covers at least the radial end face.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. In the drawing, reference numeral 1 denotes a rotary damper according to the present embodiment, which includes a casing 2, a rotary shaft 3, a vane member 4, a valve member 5, and the like.

As shown in FIGS. 1 to 4, the casing 2 is formed in a substantially cylindrical shape having a top opening and a bottom. On the inner peripheral surface of the casing 2, two partition portions 21 are formed at positions facing each other toward the axial center of the casing 2,
Two liquid chambers 23 and 24 are formed in the casing 2 with the partition 21 as a boundary. The partition 21 is formed in a substantially sector shape in a plan view, has a cavity 21a inside, and liquid passage holes 21d and 21e are provided in the walls 21b and 21c facing each other via the cavity 21a. ing. More specifically, as shown in FIG. 5, one liquid passage hole 21d formed in the wall 21b is formed so as to be cut out from the upper edge of the wall 21b to substantially the center. 21
The other liquid passage hole 21e formed in the wall portion 21c
Is formed so as to be cut out from the upper edge to the vicinity of the lower end. The difference between the shapes of the two liquid passage holes 21d and 21e is that if they are formed in the same shape and at the same position, the valve member 5 described later will be in any of the wall portions 21b and 21c.
Is to be prevented from moving the viscous liquid via the liquid passage holes 21d and 21e. The two liquid passage holes 21d and 21e allow the viscous liquid to move through the liquid passage hole when the valve member 5 comes into contact with one of the walls 21b and 21c. It is sufficient that the valve member 5 is provided in such a positional relationship and shape as to prevent the viscous liquid from moving through the liquid passage hole when the liquid comes into contact with the valve member 5, and is limited to the one shown in the present embodiment. Not something.

In the present embodiment, the liquid passage holes 21d, 21d
Since 1e is provided in the above-described shape and positional relationship,
As shown in FIG. 5, the valve member 5 is formed in a substantially rectangular flat plate having a size that can be accommodated in the hollow portion 21a, and has a substantially square through hole 51 formed below a substantially central portion. .
That is, when it comes into contact with one wall portion 21b, FIG.
As shown in (a), the upper wall portion 52 of the through hole 51 closes one liquid passage hole 21d of the wall portion 21b.
When abutting against the other wall 21c, as shown in FIG. 6 (b), a gap is formed between the one liquid passage hole 21d and the upper wall 52 of the valve member 5, so that one liquid passage hole is formed. The liquid flows from the hole 21d through the through hole 51, and further flows into the other liquid chamber from the other liquid passage hole 21e.

A distal end face 21f of the partition 21 located near the center of the casing 2 in the axial direction is provided in a substantially arc shape in plan view so as to be in sliding contact with an outer peripheral surface of the rotating shaft 3 described later (see FIG. 5). ). Furthermore, the upper surface opening 22 of the casing 2
Is provided with a lid member 6 through which a rotating shaft 3 described later can be inserted. As shown in FIG. 3, the lid member 6 has a substantially disk shape.
A lid body 61 having a rotation shaft insertion hole 61a formed substantially in the center thereof, and a disk-like body having a rotation disk insertion hole 6 formed substantially in the center.
2a has a liquid flow path forming plate 62 formed through. Reference numeral 63 denotes an outer lid, which is provided outside the lid main body 61 as necessary.

The lid main body 61 and the liquid flow path forming plate 62 are arranged such that the lid main body 61 is disposed on the front side, the liquid flow path forming plate 62 is located on the back side, and the back side 62c is located on the front surface 71d of the spacer plate 7 described below.
It is arranged in contact with. In the liquid flow path forming plate 62, a rotating shaft 3 and a vane member 4, which will be described later, apply a braking force to the back surface 62 c, that is, a cavity 21 a formed in the partition 21.
Two liquid channels 62b are formed symmetrically in the X direction with the same width as the base end and formed in a circular arc shape in the X direction. The liquid flow path 62b extends from the back surface 62c to the front surface 62d of the liquid flow path forming plate 62 in the same manner as above.
Two holes may be provided symmetrically in the direction and having the same width and formed in an arc shape. However, when the lid member 6 is formed only of the lid main body 61 and the liquid flow path forming plate 62 is not provided, the liquid flow path may be formed on the back surface of the lid main body 61.

As shown in FIGS. 2 and 3, the spacer plate 7 has a back surface 71b on the inner side of the lid member 6 which contacts the upper end surface of the partition 21 of the casing 2 and the upper end surface of the vane member 4 described later. It is arranged to touch. The spacer plate 7 includes
An orifice including a plurality of small holes 71a formed at a predetermined interval in a range corresponding to the liquid flow path 62b of the lid member 6 is formed. As shown in FIG. 8, the diameter of each small hole 71a constituting the orifice of the spacer plate 7 is determined by the direction in which the braking force is exerted by the rotating shaft 3 and the vane member 4 described later (arrow X).
Direction) gradually becomes smaller,
As the vane member 4 rotates in the X direction, a larger braking force can be exerted. The reason why the orifice formed of such small holes 71a is formed in the spacer plate 7 is that a plurality of spacer plates 7 having various orifices having different numbers and / or diameters of the small holes 71a constituting the orifice are formed. Is prepared, if it is desired to change the braking characteristic of the rotary damper 1 in accordance with a change in torque on the movable side of the rotary lid or the like, it is only necessary to replace the spacer plate 7 alone. Further, since the orifice of the spacer plate 7 is constituted by the small holes 71a, it is only necessary to form the small holes 71a with a drill or the like, and it is not necessary to prepare a mold, so that the manufacturing cost can be reduced.

The reference numerals 25 and 2 shown in FIGS.
Reference numeral 6 denotes a stopper wall protruding from the inner surface of the bottom wall of the casing 2 adjacent to the partition wall 21, and is provided to regulate the rotation range of the rotating shaft 3 and the vane member 4 described later. Therefore, depending on the desired rotation range, the size may be variously varied, and the stopper wall may not be provided.

As shown in FIG. 2, the rotating shaft 3 is formed in a substantially columnar shape, and one end 31 of the rotating shaft 3 forms the lid member 6.
1 and a rotary shaft insertion hole 61 formed in the liquid flow path forming plate 62
a, 62a and a rotary shaft insertion hole 71c formed in the spacer plate 7, and the other end 32 is disposed in contact with a groove 27 formed in the inner surface of the bottom wall of the casing 2.

Two vane members 4 are provided so as to protrude at positions facing each other on the rotating shaft 3, and are disposed so as to be located in the respective liquid chambers 23 and 24. More specifically, the vane member 4 includes a vane body 41 and a vane cover 42, as shown in FIG. The vane body 41
The upper surface 41a is formed in a substantially rectangular flat plate shape, and the length along the axial direction is such that when rotated, the upper end surface 41a is in sliding contact with the back surface 71b of the spacer plate 7, and the lower end surface 41b is in sliding contact with the inner surface of the bottom wall of the casing 2. It has about a length. The length in the radial direction is shorter than the distance from the inner peripheral surface of the casing 2 to the outer peripheral surface of the rotating shaft 3 in the radial direction. The vane cover 42 is made of a synthetic resin, and has an axial length substantially the same as the vane body 41.
1 has a thickness substantially equal to or slightly greater than the distance from the radial end face 41c to the inner peripheral surface of the casing 2, and the radial end face 41c of the vane body 41, the surface 41d of the vane body 41, 41e. With such a configuration, it is possible to prevent a gap from being formed between the casing 2 and the inner peripheral surface due to the elastic force of the vane cover 42, and to include the vane body 41 and the vane cover 42. Since the entire thickness of the vane member 4 along the circumferential direction is increased, leakage of viscous liquid from the spacer plate 7 and the vane member 4 and the sliding contact surface between the inner surface of the bottom wall of the casing 2 and the vane member 4 are extremely small. (See FIGS. 1 and 2). The vane cover 42
It suffices to perform such a function, and at least the radial end face 41c of the vane main body 41 can be covered, and the width along the circumferential direction is made larger near the radial end face 41c than the thickness of the vane main body 41. I just want to be able.

In the present embodiment, the reason why such a vane cover 42 is provided is that the present invention is to change the braking characteristics such as the strength of the braking force by replacing the spacer plate 7 described above. Therefore, in order to perform this more reliably, it is necessary to prevent leakage of the viscous liquid from a portion other than the liquid passage hole, the orifice and the liquid flow path, and to enhance the sealing property.

Next, the operation of the above embodiment will be described. First, one end 31 of the rotating shaft 3 is connected to a shaft (not shown) such as a rotating lid to be braked, and the rotating damper 1 according to the present embodiment is disposed at a predetermined position. If the rotary lid or the like is in an open state, it is closed. With the closing operation of the rotating lid and the like, the shaft body, the rotating shaft 3 and the vane member 4 connected thereto rotate in the X direction in FIG. When the vane member 4 rotates in the X direction, the viscous liquid flows in the X direction and tries to flow into the other liquid chamber. To the wall 21b. As a result, the upper wall 52 of the valve member 5 closes the liquid passage hole 21d formed in the wall 21b (see FIG. 6A). Therefore, the liquid passage hole 2
The viscous liquid does not move through 1d, but moves through only the small holes 71a and the liquid flow path 62b constituting the orifice. The viscous resistance at that time causes the vane member 4 and the rotating shaft 3 to move in the X direction. Slowly rotate in the direction. As the vane member 4 rotates in the X direction, the diameter of each small hole 71a forming the orifice becomes smaller (see FIG. 8A). For this reason, the braking force gradually increases, and the vane member 4 rotates more slowly.
When it comes into contact with 6, the turning operation is stopped.

At this time, the braking force may be too large due to factors such as the weight of the rotating lid to be braked. Further, there are cases where it is desired to change the braking force significantly or to change the position where the braking force starts to increase. In this case, it is possible to cope by removing the lid member 6 and replacing the spacer plate 7 with another spacer plate.

On the other hand, when the rotating lid or the like to be braked is released from the closed state, the rotating shaft 3 and the vane member 4 rotate in the Y direction opposite to the above. The viscous liquid flows in the Y direction, whereby the valve member 5 is pressed against the other wall 21 c of the partition 21. As a result, the viscous liquid enters the cavity 21a of the partition 21 from one liquid passage hole 21d,
The other liquid passage hole 21 passes through the through hole 51 of the valve member 5.
e, and flows into the other liquid chambers (FIG. 6).
(B)). That is, a larger amount of the viscous liquid is moved as compared with the case of rotating in the X direction, and the opening operation can be performed smoothly.

[0024]

According to the rotary damper of the present invention, since there is a replaceable spacer plate having an orifice formed of a small hole, the braking force such as the strength of the braking force is adjusted in accordance with the torque change on the movable side of the rotating lid or the like. Characteristics can be varied. Therefore, one rotary damper can be used as a buffer device for various rotary lids. In addition, since the spacer plate has such a configuration, the manufacturing cost can be reduced. In addition, if a member having a vane cover made of resin is used as the vane member, the sealing effect is enhanced, and the above-described effect of changing the braking characteristics can be more reliably exerted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a rotary damper of the present invention.

FIG. 2 is a vertical sectional view of the embodiment.

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

FIG. 4 is a perspective view showing a main body case used in the embodiment.

FIG. 5 is a perspective view showing a structure of a partition wall portion and a valve member of the main body case used in the embodiment.

FIG. 6 is a view for explaining movement of a valve member used in the embodiment.

FIG. 7 is a perspective view showing a structure of a rotating shaft and a vane member used in the embodiment.

FIG. 8A is a plan view showing a liquid flow path forming plate and a spacer plate used in the embodiment, and FIG.
It is -A sectional drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary damper 2 Casing 21 Partition part 3 Rotation axis 4 Vane member 41 Vane main body 42 Vane cover 5 Valve member 6 Lid member 61 Lid main body 62 Liquid flow path forming plate 7 Spacer plate

Claims (4)

[Claims] 1. A substantially cylindrical casing with a bottom provided with a partition protruding from an inner peripheral surface toward an axial center, and disposed along the axial center of the casing, and an outer peripheral surface of the casing is provided. A rotating shaft having an outer diameter enough to be in sliding contact with the distal end surface of the partition; a projection protruding from the outer peripheral surface of the rotating shaft; and a partition formed by the outer peripheral surface of the rotating shaft, the inner peripheral surface of the casing, and the partition. A vane member that rotates in accordance with the rotation of the rotation shaft in a liquid chamber filled with the viscous liquid, and an arc-shaped liquid flow path through which the viscous liquid passes through a lower surface while closing an upper opening of the casing. A rotary damper comprising: a cover member having the cover member; and a spacer plate disposed inside the cover member, wherein the spacer plate is replaceable and has a predetermined width in a range corresponding to a liquid flow path of the cover member. Small holes formed at intervals The damping characteristic can be varied by replacing the spacer plate with a spacer plate having a different number and / or diameter of small holes constituting the orifice. Rotating damper. 2. A liquid flow system comprising: a lid member; a lid body, a groove formed inside the lid body, and a groove formed in an arc shape on the back surface, or a hole formed in the arc surface from the back surface to the surface. The rotary damper according to claim 1, comprising a liquid flow path forming plate having a passage. 3. The liquid passage of the lid member has the same width in the direction of exerting the braking force of the rotating shaft and the vane member, and forms an orifice formed in the spacer plate. 3. The rotary damper according to claim 1, wherein the diameter of each of the small holes is gradually reduced in the direction in which the rotating shaft and the vane member exert the braking force. 4. The vane member has a length in the axial direction substantially equal to that of the vane body, and a width along a circumferential direction is wider than a radial end surface of the vane body. The rotary damper according to any one of claims 1 to 3, further comprising: a resin vane cover that covers the radial end surface.