JP2004068899A - Damper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper mechanism using oil, obtaining resistance force to external force in one rotating direction by using the oil, showing shock-absorbing action due to the resistance force, namely brake force, and used for various purposes (for example, a toilet seat) requiring to the utmost only the minimum resistance force in a reverse rotating direction. <P>SOLUTION: The damper device is composed of a cylinder 20 having a partition wall 22 dividing the inside into two parts in an axial direction; a rotating shaft 30 having a wing portion 35 slidable on an inner peripheral wall surface of the cylinder 20, and rotatably inserted and arranged in the cylinder 20; a compression chamber A1 and a decompression chamber A2 wherein the inside of the cylinder is divided by the wing portion 35 in an axial direction of the rotating shaft 30; oil filled in each chamber; and a check valve device portion 40 arranged in each chamber divided by the wing portion 35. A groove 24 communicating to the compression chamber side is formed on a cylinder bottom portion in the decompression chamber side. Therefore, the oil in the compression chamber is released to the decompression chamber side through the groove 24, so that an area wherein oil damper is not effective can be provided, and the toilet seat or a toilet cover can be returned to a stopping position by comparatively weak force. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention uses oil and obtains a resistance to an external force in one rotation direction by using the oil, thereby exerting a buffering action by the resistance, that is, exerting a braking force, and The present invention relates to an improvement in a damper mechanism which can be used in various applications in which a resistance as small as possible is required in a rotation direction.
[0002]
[Prior art]
In recent years, hot water cleaning devices have become widely used because they are clean and sanitary. When opening and closing the toilet lid and the toilet seat of this hot water washing device, it hits the toilet bowl and generates an impact. Therefore, some hot water washing devices have been attempted to suppress the impact by using a damper device together with a rotating shaft.
Conventionally, this type of damper device has a configuration as shown in FIG. Hereinafter, the configuration will be described with reference to the drawings. As shown in FIG. 12, the damper device 100 includes a cylinder 102, a rotating shaft 103, a check valve 104, and the like. The cylinder 102 has a partition wall 102 a on its inner wall, and the rotating shaft 103 penetrates inside, Oil is filled in a chamber 105 divided into two parts by a rotating shaft 103 and a partition wall 102a. The rotating shaft 103 has wings 106 projecting radially, and the check valve 104 and the wings 106 further divide the chamber 105 into a pressure chamber 105a and a decompression chamber 105b. The wing portion 106 has a communication passage 107 for communicating the pressurizing chamber 105a and the depressurizing chamber 105b. The check valve 104 has an outer surface in contact with the inner peripheral surface of the cylinder 102 and an inner surface surrounding the wing portion 106. In addition, a control port 108 is provided on the decompression chamber 105b side, and the pressurization chamber 105a and the decompression chamber 105b communicate with the communication path 107 of the wing portion 106. In FIG. X, 109 is an O-ring, and 110 is a cap for sealing the tip of the cylinder 102. Then, the rotating shaft 103 rotates and the mutual position of the wing portion 106 and the check valve 104 changes, and the check valve 104 rotates by controlling the amount of oil flowing from the pressurizing chamber 105a to the depressurizing chamber 105b. It controls the speed.
As shown in FIG. 13, the damper device 100 is fixed to the cleaning device main body 112 installed on the toilet, and the toilet seat 113 and the toilet lid 114 are connected via the rotation shaft 103 of each damper device 100. . When the user lifts and opens or closes the toilet seat 113 or the lid 114 when the user opens the toilet seat 113 or the toilet lid 114, if the user pulls the toilet seat 113 or the toilet lid 114 gently toward the front, the action of the damper device 100 sharply increases. It closes while suppressing an excessive rotation speed.
[0003]
[Problems to be solved by the invention]
However, in the above-described damper device 100, unless the toilet seat 113 or the toilet lid 114 falls down with a relatively strong force in order for the damper to work in the entire rotation area, the stall occurs before the toilet seat 113 or the toilet lid 114 becomes independent. In some cases, the closing operation was stopped or the closing time was abnormally long.
For this reason, it is conceivable that the gap between the inner periphery of the cylinder 102 and the outer periphery of the wing portion 106 is partially enlarged so that the damper does not work near the self-standing position. However, there is a concern that the strength is insufficient because a thin portion is partially formed. In addition, there is a concern that the cylinder 102 will have a large diameter in order to ensure strength.
Although an oil damper having an orifice-removing groove has been proposed as disclosed in Japanese Patent Application Laid-Open No. 7-119781, it is necessary to trial and error to close the closing operation of the toilet seat and the lid with a desired feeling. It was necessary to tune the groove width.
[0004]
Means for Solving the Problems, Functions and Effects
In order to solve the above-mentioned problems, the present invention provides a substantially cylindrical cylinder having a partition wall that bisects the inside in the axial direction, and a substantially cylindrical rotating shaft rotatably inserted and disposed in the cylinder. A wing portion which is slidable on the inner peripheral wall surface of the cylinder by the relative rotation of the rotating shaft with respect to the cylinder and which is provided on the outer periphery of the rotating shaft and protrudes in the radial direction, and the inside of the cylinder is rotated by the wing portion In a damper device comprising a pressurizing chamber and a depressurizing chamber partitioned in an axial direction of a shaft, oil filled in each chamber, and a check valve device disposed between the chambers partitioned by the wings, Since a groove communicating with the pressurizing chamber side is formed at the bottom of the cylinder on the depressurizing chamber side, it is possible to provide a region where oil in the pressurizing chamber escapes to the depressurizing chamber side via the groove to make the oil damper ineffective. Yes, toilet seat or lid is relatively weak In can be returned to the closed position. In addition, it is not necessary to increase the diameter of the cylinder, and the apparatus itself can be made compact.
In addition, since the depth of the groove is specified in three stages: fixed depth range / depth change (from constant to zero) range / depth zero range, the ideal toilet seat It is easy to design a damper that fits the closing feeling curve of the toilet lid.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a reference example for understanding the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view of a damper device 1 of this reference example, FIG. 2 is a cross-sectional view, FIG. 3 is a plan view for explaining damper chambers A and B, and FIG. FIG. 5 is a partially enlarged sectional view when the communication passage 52a is opened by the check valve 40. FIG. 6 is a partially enlarged sectional view of the rotary plate 50 for explaining the groove 52 and the communication passage 52a. It is a perspective view.
First, the components of the damper device 1 will be described with reference to FIG. The damper device 1 includes a cylinder 20, an O-ring 29, a rotating shaft 30, a valve body 40 of a check valve device, a rotating plate 50, an O-ring 59, a lid 60, and a permanent magnet 70. The permanent magnet 70 is for detecting the rotational position of the rotating shaft 30 by a Hall IC provided near the damper device 1, and is omitted when it is not necessary to detect the rotational position.
The cylinder 20 is formed in a cylindrical shape with a bottom, and a pivot hole 21 for rotatably supporting the output shaft 31 of the rotating shaft 30 is provided at the bottom. Further, a partition wall 22 is formed on the bottom side of the inner wall of the cylinder, and a female screw portion 23 is formed on the open end.
The rotating shaft 30 is formed in a substantially columnar shape, the output shaft 31 is formed at the tip, the wing portion 35 protruding in the radial direction is formed on the outer periphery of the intermediate portion, and the connecting shaft 34 is formed at the rear end. The output shaft 31 has a hinge hole 32 for fixing a hinge pin such as a toilet seat or a toilet lid so as not to rotate. A groove 33 for accommodating a part of the check valve body 40 is formed at the rear end of the wing portion 35. Further, an O-ring groove 36 for accommodating the O-ring 29 is provided on the outer periphery of the output shaft 31.
The rotating body 50 is formed in a substantially columnar shape slightly smaller in diameter than the cylinder 20, and has a hinge hole 51 similar in shape to the connecting shaft 34 and a groove 52 for accommodating a part of the check valve body 40 at the front end. The O-ring groove 53 for accommodating the O-ring 59 is formed in the outer periphery. Further, an insertion hole 54 for inserting the permanent magnet 70 is provided on the outer periphery of the rear end. Further, a bypass groove 55 for connecting the front end face of the rotating body 50 and the O-ring groove 53 is provided.
The lid 60 is formed in a cylindrical shape with a bottom, and has a male screw portion 61 formed on the outer periphery to be screwed into the cylinder 20. The lid 60 brings the rotating body 50 into contact with the rotating shaft 30 and keeps these members from coming off the cylinder 20. In addition, a plurality of grip holes 62 for gripping with a dedicated jig for assembly are formed on the rear end surface.
[0006]
Next, the configuration of the damper device 1 will be described with reference to FIGS. Oil is filled in damper chambers A and B, which are divided into two by a partition wall 22 around a rotation shaft 30 sealed by an O-ring 29 and an O-ring 59 inside the damper device 1 and the rotation shaft 30. The chamber A (B) is formed by the check valve body 40 disposed on the end face of the wing portion 35 and the wing portion 35 and the rotating body 50 where the facing surfaces are in contact with each other, and the pressure chamber A1 (B1) and the decompression chamber A2 (B2). And is further divided into two. The groove 52 has a communication passage 52a for communicating the pressurizing chamber A1 and the depressurizing chamber A2. The check valve 40 is slidably provided in the wing portion 35 and the groove 33 of the rotating body 50 and the groove 52. I have. As shown in FIGS. 4 to 6, the groove 33 has a substantially same diameter as the valve body 40 at an end and a straight section at an intermediate portion to define the operating range of the valve body 40, and the groove 33 is substantially similar to the valve body 40. Form the same length. The communication passage 52 a provided in the groove 52 has one end provided in a position facing the groove 33, and the other end provided in a portion protruding from a position facing the groove 33.
Here, the braking force of the damper mechanism acts due to the relative rotational movement of the rotating shaft 30 with the cylinder 20. Now, when the rotating shaft 30 rotates in the direction of arrow R in FIG. Then, the check valve device section constituted by the above-described check valve body 40 and the grooves 33 and 52 is closed, whereby the damper is turned on, and the braking force based on the oil is exerted. (See Fig. 4)
That is, in the state where the damper is ON, the wing portion 35 on the rotating shaft 30 and extending on one diameter line thereof rotates in the direction of the arrow R in FIG. When the oil in the pressurizing chambers A1 and B1 is pressurized, the check valve 40 moves in the direction opposite to the rotation direction of the rotary shaft 30 by being pressed by the oil, and the communication passage recessed in the groove 52. 52a is closed. At this time, the pressing force received by the check valve 40 from the oil is decomposed by the grooves 33 and 52, and presses the rotating shaft 30 and the rotating body 50 in the axial direction. This eliminates the gap between the rotating shaft 30 and the bottom of the cylinder 20. Therefore, the oil moves to the decompression chambers A2 and B2 via a small gap between the wing portion 35 and the cylinder 20, or to the decompression chambers B2 and A2 via a small gap between the partition wall 22 and the rotary shaft 30, respectively.
Further, when the rotary shaft 30 is rotated in the direction opposite to the direction of the arrow R, the damper is turned off. When the damper is in the OFF state, the check valve 40 opens the communication passage 52a, so that the oil smoothly moves from the decompression chambers A2, B2 to the pressurization chambers A1, B2 via the communication passage 52a. (See Fig. 5)
[0007]
Next, an embodiment of the present invention will be described with reference to FIGS. In this embodiment, a groove 24 is formed on the bottom surface of the cylinder 20 in addition to the above-described reference example. The configuration and operation of the groove 24 will be described in detail with reference to the drawings. 7 is a cross-sectional view of the damper device 1 of the present embodiment, FIG. 8 is a plan view for explaining the damper chambers A and B and the groove 24, and FIG. 9 is a simplified cross-section taken along line CC in FIG. FIG. 10 is a side view showing the state of the toilet seat, and FIG. 11 is a graph showing the angular velocity with respect to the angle when the toilet seat on which the damper device 1 of this embodiment is mounted falls.
As shown in FIG. 9, the groove 24 has a substantially constant depth in the range of 40 ° (quick start area) from the base (0 °) of the partition wall (one partition wall) 22 on the decompression chamber A2 side. , In the range of 40 to 90 ° (degradation region), the groove 24 is not formed in the range of 90 to 120 ° (slow end region). The position of 120 ° corresponds to the base of the partition wall (the other partition wall) 22 on the side of the pressurizing chamber A1.
As a result, until the toilet seat exceeds the self-standing position, the oil in the pressurizing chambers A1 and B1 between the wing portion 35 and the partition wall 22 is pressurized, pressed by the oil, and the check valve body 40 rotates. Although it moves in the direction opposite to the rotation direction of the shaft 30 and closes the communication passage 52a, in the quick start area, the groove 24 is formed with a substantially constant depth, so that the decompression chambers A2, B2 and the pressurization chamber A1, Since the oil is communicated with B1, the oil moves to the decompression chambers B2 and A2 via the groove 24, respectively. Therefore, in this quick area, the state is the same as the state in which the damper is OFF.
In a region where the toilet seat falls down under its own weight beyond the self-standing position (a position where it cannot fall down under its own weight), the groove 24 is gradually formed shallower. The amount of oil that moves to gradually decreases, and the damper gradually turns ON. Since the groove 24 is not formed in the area where the toilet seat is just before closing, the damper is in the ON state, and the oil flows through the slight gap between the outer circumference of the wing portion 35 and the inner circumference of the cylinder 20 as described above. Then, they move to the decompression chambers A2, B2 or to the decompression chambers B2, A2 via a slight gap between the inner circumference of the partition wall 22 and the outer circumference of the rotary shaft 30 respectively.
As a result, the toilet seat transitions to the state immediately before closing relatively quickly, and thereafter the toilet seat is abutted and closed on the toilet upper surface at a gentle speed.
[0008]
In the present embodiment, the quick start area is set to 40 ° from the open end, but this is set by the self-standing angle of the toilet seat, and if the hinge position of the toilet seat, the position of the center of gravity is changed, it is changed accordingly. There must be.
In addition, although the slow end region is set at 30 ° from the closed end, if the hinge position, the center of gravity position, and the own weight of the toilet seat are changed, it must be changed accordingly. This is because unless the velocity is sufficiently decelerated in the slow-end region to an angular velocity equal to or lower than a predetermined value, there is a risk of colliding with the upper surface of the toilet bowl and producing a violent sound or damaging the toilet seat / toilet lid.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a damper device 1 of the present invention. FIG. 2 is a cross-sectional view of a first embodiment of a damper device 1 of a reference example for understanding the present invention. FIG. FIG. 4 is a plan view for explaining damper chambers A and B according to a reference example of the present invention. FIG. 4 is a perspective view of a damper device 1 according to a reference example for understanding of the present invention when a communication passage 52a is shut off by a check valve 40. 5 is a partially enlarged cross-sectional view of the damper device 1 of the reference example for understanding of the present invention when the communication passage 52a is opened by the check valve 40. FIG. FIG. 7 is a partially enlarged perspective view of a rotating body 50 for explaining a groove 52 and a communication path 52a of a damper device 1 according to a reference example of the present invention. FIG. 7 is a cross-sectional view of the damper device 1 according to an embodiment of the present invention. Damper chambers A and B of the damper device 1 according to the embodiment of the present invention FIG. 9 is a schematic view showing a simplified cross section taken along line CC of FIG. 8. FIG. 10 is a state of a toilet seat on which a damper device 1 according to an embodiment of the present invention is mounted. FIG. 11 is a graph showing an angular velocity with respect to an angle when the toilet seat on which the damper device 1 of the embodiment of the present invention is mounted falls. FIG. 12 is a cross-sectional view showing a conventional damper device. FIG. 13 is a longitudinal sectional view, and FIG. 13B is a transverse sectional view. FIG. 13 is a perspective view of a sanitary washing device main body provided with a conventional damper device.
DESCRIPTION OF SYMBOLS 1 ... Damper device, 20 ... Cylinder, 22 ... Partition wall, 24 ... Groove, 30 ... Rotating shaft, 35 ... Blade part, 40 ... Check valve body, 50 ... Rotating body, 60 ... Lid, 70 ... Permanent magnet, A1 ... Pressure chamber, A2 ... Decompression chamber, B1 ... Pressure chamber, B2 ... Decompression chamber

Claims (4)

A substantially cylindrical cylinder having a partition wall that bisects the inside in the axial direction, a substantially cylindrical rotating shaft rotatably inserted and disposed in the cylinder, and a relative rotation of the rotating shaft with respect to the cylinder. A wing portion which is slidable on the inner peripheral wall surface of the cylinder by the movement and which is provided on the outer periphery of the rotating shaft and protrudes in the radial direction thereof; In a damper device comprising a decompression chamber, oil filled in each chamber, and a check valve device disposed between the chambers partitioned by the wings, the pressure chamber is provided at a cylinder bottom on the decompression chamber side. A groove which communicates with a side of the damper. The damper device according to claim 1, wherein the groove is provided over a predetermined range from a base of the partition wall. 3. The groove according to claim 1, wherein the groove has a constant depth and width from 0 ° to 40 ° at the base of the partition wall, and the groove gradually decreases from 40 ° to 90 °. 4. Damper device. 4. The damper device according to claim 3, wherein the groove is formed not to extend from 0 ° to 30 ° at the root of the other partition wall. 5.

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