JPH0450524A - Rotary damper - Google Patents

Abstract

PURPOSE:To reduce the rotational torque of a rotational body which gradually increases by providing plural recessed channels of different widths on the outer periphery of a rotor or the inner periphery of an outer cylindrical body and also inserting protruding pieces of plural movable plates into the respective recessed channels of different widths. CONSTITUTION:When a toilet basin lid 11 rotates to close from the open state, a rotor 4 fixed to a rotary shfat 5 rotates together with the rotary shaft 5 of a rotary damper 1 due to the rotation of a hinge pin 13. Consequently, a movable plate 7 of which a protruding piece 7b engages a recessed channel of the narrowest width in the rotor 4 starts to rotate in the X direction. Then, when the rotor 4 rotates by a predetermined angle, the side wall of recessed channel of a wider width than the recessed channel 4a comes in contact with the protruding piece 7b of the plate 7 so that the plate 7 is rotated in the X direction. Accordingly, as the rotational torque increases, the number of rotary plates increases, so that the shearing resistance of a viscous liquid 8 due to the plate 7 and a fixed plate 6 is further increased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotating object used for absorbing a falling impact caused by free rotation of a rotating object or a collision impact at the final opening rotation of an interior door of a building, etc. Regarding dampers.

[Prior Art] In general, opening/closing lids of pianos, record players, portable computers, copy machines, and other office equipment, opening/closing lids of pianos, etc., toilet seats and toilet lids of Western-style toilets, etc. are supported at one end by a rotating shaft. At the same time, the other end is a free end and is provided so as to be rotatable in the vertical direction within a rotation angle range of about a quarter circle to about 120 degrees.

When closing such a rotating object, such as a toilet lid or a toilet seat of a Western-style toilet bowl, the lid or the like becomes a free-falling rotating object. At this time, if you do not close it with your hand until the end, there is an inconvenience that it will collide at the final point of the opening rotation, producing a large impact sound and causing damage.

In view of this inconvenience, conventionally, various types of rotary dampers have been installed, such as those that utilize the viscous resistance of liquid and those that utilize frictional resistance.

[Problems to be Solved by the Invention] All such conventional rotary dampers exert a constant braking force. Therefore, when such a rotary damper is installed, for example, in the case of the above-mentioned free-falling rotating object, the rotational force gradually increases in proportion to the rotation angle, so the braking force decreases relatively and the rotating object gradually The increase in speed is the same as when no rotary damper is provided.

In this case, in order to obtain a large braking force even at a rotation angle of 60 degrees or more where the rotational force is large, the braking force at the initial stage of rotation must be made larger.
This is inconvenient when performing the opening operation. On the other hand, if the braking force at the initial stage of rotation is reduced, there is a possibility that the damper effect described above at the end of the closing rotation cannot be expected.

The present invention has been made to solve the above-mentioned problems, and provides a rotary damper whose braking force gradually increases in response to fluctuations in rotational force, such as rotating objects that perform free-falling motion. The purpose is to

[Means for Solving the Problems] In order to achieve the above object, the rotary damper according to the first invention includes a plurality of grooves formed along the axial direction and having two or more different widths in the outer circumference. a rotor, at least a portion of which is loaded into an outer cylindrical body and is disposed so as to rotate freely relative to the outer cylindrical body, and whose axial direction coincides with the axial direction of the rotor; and a rotating shaft having at least one end protruding outward from the outer cylinder and disposed integrally with or connected to and fixed to the rotor, and a convex portion formed on the outer periphery extending in the axial direction of the inner wall of the outer cylinder. a fixing plate that is fitted and fixed in an engaging groove along the rotor, and has a hole provided in the center having an inner diameter larger than the outer diameter of the rotor, and an outer diameter smaller than the inner diameter of the outer cylinder; At the same time, a hole provided in the center thereof is formed to have an inner diameter larger than the outer diameter of the rotor, and the inner peripheral portion forming the hole has a plurality of grooves provided in the rotor. a movable plate formed with a convex column capable of engaging with a concave groove formed to have the narrowest width among the movable plates; The pillars are inserted around the rotor so as to engage with different concave grooves of the rotor, and are brought into contact with each other, and a liquid of an appropriate viscosity is interposed between the contact surfaces. do.

A rotary damper according to a second aspect of the present invention includes an outer cylinder body having a plurality of grooves formed along the axial direction and with two or more different widths in an inner circumferential part, and at least a part of the outer cylinder body. A rotor shaft that is loaded into the body and supports the outer cylinder with relative freedom of rotation, and a convex portion formed on the inner circumference fits into an axially extending engagement groove formed on the inner wall of the rotor shaft. a fixing plate that is fixed and has an outer diameter smaller than or equal to the inner diameter of the outer cylinder; an outer diameter that is smaller than or equal to the inner diameter of the outer cylinder; , formed with an inner diameter equal to or larger than the outer diameter of the rotor shaft, and on the outer periphery thereof, a convex column is formed that can engage with a concave groove formed in the narrowest width among the plurality of concave grooves provided in the outer cylinder body. a plurality of fixed plates and a plurality of movable plates alternately,
Further, each movable plate is inserted around the rotor axis so that the convex pillars are engaged with different grooves of the outer cylinder body so that they are in contact with each other, and a layer of viscosity is suitably applied between the contact surfaces. It is characterized by the presence of liquid.

[Function] In the first invention, first, the rotary damper is installed with the outward protrusion of the rotary shaft or the outer cylinder fixed to the rotary base of the rotating object.

For example, if the outward protrusion of the rotating shaft is fixed,
At the beginning of the closed rotation of the rotating object, only the movable plate that is engaged with the narrowest groove among the grooves provided in the rotor rotates together with the rotating shaft and the rotor. As the movable plate rotates, shear resistance of the liquid interposed between the movable plate and the fixed plate acts (however, the resistance is small because the number of rotating movable plates is small).

On the other hand, when an arbitrary angle is reached, the movable plate whose protrusions are engaged with a groove wider than the narrowest width of the grooves provided in the rotor starts to rotate. This increases the shear resistance of the viscous liquid.

Furthermore, since all the movable plates begin to rotate at least before the end of the closing rotation of the rotating object, the greatest braking force is exerted at this time.

On the other hand, the rotary damper according to the second invention is installed with the rotor shaft fixed or the outer cylinder body fixed. and,
When the rotor shaft is fixedly arranged, for example, by protruding a fixing plate etc. that can be fixed to a door opening frame etc. along the axial direction on the outer periphery of the outer cylinder, the fixing plate can be fixed. When actuated in the rotational direction, the outer cylinder rotates with respect to the rotor axis.

As a result, the convex pieces sequentially rotate from the movable plate that is engaged with the narrow groove of the outer cylinder, and the braking force gradually increases as in the first invention.

[Example] Hereinafter, the present invention will be explained in more detail based on the example shown in the drawings.

(Example 1) 1 to 7 show an embodiment according to the first invention.

In the figure, l indicates a rotary damper according to this embodiment,
The rotary damper 1 includes an outer cylinder body 2, a rotor 4, and a rotating shaft 5.
, a fixed plate 6, a movable plate 7, a viscous liquid 8, etc.

As shown in FIG. 1, the outer cylindrical body 2 is a cylindrical body having an opening 2a at one end and a bottom 2b having an opening approximately in the center at the other end.The opening 2a has a lid member 3. The structure is equipped with In this case, it goes without saying that the bottom portion 2b may also be completely open, and a back cover member (not shown) may be attached thereto.

The rotor 4 is formed into a hollow cylindrical shape, and is disposed such that its axis coincides with the axis of the outer cylinder 2.

Further, step portions 4e and 4f protrude from the upper and lower surfaces of the outer cylinder 2 so that at least a portion thereof is located inside the outer cylinder 2.
a bottom opening 2C formed in the bottom 2b of the outer cylinder 2;
It is disposed so as to be fitted into a through hole 3a formed approximately at the center of the lid member 3, and is loaded so as to be freely rotatable relative to the outer cylinder body 2 and the lid member 3. Note that 9 is a gasket for preventing leakage of the viscous liquid 8, which will be described later.

A plurality of grooves 4 are provided on the outer peripheral surface of the rotor 4 along the axial direction to engage with convex pieces 7b protruding from the movable plate 7, which will be described later.
a, 4b, and 4c are formed. These grooves 4a and the like are formed with different widths, for example, as shown in FIG.
4c and 4c can be formed with three different widths, each having the same width.

In the hollow portion 4d of the rotor 4, a rotating shaft 5, which is disposed with at least one end 5a protruding outside the outer cylindrical body 2, is fixedly connected. Although the fixing method is not particularly limited, in this embodiment, as shown in FIGS. 2, 5, and 6, the hollow portion 4d is formed to have a substantially rectangular cross section, and at least the hollow portion 4d is The part of the rotating shaft 5 inserted into the rotor 5 is fixedly arranged in the same (approximately square cross section).In this case, the rotor 4 is not formed into a cylindrical body but is formed into an approximately cylindrical shape,
The rotary shaft 5 may be integrally formed in a protruding manner so that the axial directions thereof coincide with each other.

The fixed plate 6 and the movable plate 7 are shown in FIGS. 3 and 4.
As shown in the figure, the holes 6a and 7 are located in the center of each hole.
These plates 6.7 are alternately inserted into the rotor 4 and held in the hollow part of the outer cylinder 2 in close contact with each other. There is. In this case, for example, a spring (not shown) supported and disposed on the bottom 2b of the outer cylinder 2 may be used to press them against each other to increase their closeness. With this configuration, the rotational speeds of the movable plate 7 and the rotor 4 can be adjusted by adjusting the elastic force of the spring.

Here, the fixed plate 6 has a convex portion 6b provided on its outer periphery.
As shown in FIG. 1, it is fitted and held in an engagement groove 2c formed in the inner wall of the outer cylinder 2 along the axial direction, and the inner circumferential surface of the hole 6a is connected to the rotor. The inner diameter is such that it does not come into contact with the outer peripheral surface of No. 4.

Similar to the fixed plate 6, the movable plate 7 has an inner circumferential surface of a hole 7a formed in such an inner diameter that it does not come into contact with the outer circumferential surface of the rotor 4, while its outer circumferential surface is in contact with the inner circumferential surface of the outer cylindrical body 2. It is formed with an outer diameter that does not make contact with the Furthermore, a pair of convex pillars 7b that protrude inward are formed on the inner circumferential surface of the movable plate 7 forming the cavity 7a. This convex pillar 7b
, a plurality of grooves 4a and 4b formed in the rotor 4;

It is formed in a width that can be engaged with the groove 4a having the narrowest width among the grooves 4c. When inserted into the rotor 4, the convex columns 7b of the plurality of movable plates 7 are formed into different concave grooves 4a and 4b.

4c.

Therefore, when the movable plate 7 is provided, there is almost no play in the relationship between the groove 48 having the narrowest width and the convex post 7b that engages with it, but the groove 4a
The groove 4b is wider than the groove 4b.

4c, there is a certain amount of play (see FIGS. 5 and 6).

The viscous liquid 8 is made of a high viscosity liquid such as silicone oil, and is interposed between the contact surfaces of the fixed plate 6 and the movable plate 7, and is inserted into the hollow part of the outer cylinder 2 through a predetermined injection port. It is injected and hermetically sealed.

Next, an explanation will be given of the effect when the rotary damper l of this embodiment having such a configuration is applied to the toilet lid 11 of a Western-style toilet as shown in FIG. 7 as an example of a freely falling rotating object.

First, the rotary damper 1 is installed as follows.

11a is a rotating base of the toilet lid 11, and 12a is a rotating base of the toilet seat 12. Reference numeral 13 denotes a hinge bin, which is inserted through and fixed to the pivoting base 11a of the toilet lid 11, and is freely rotatably passed through the pivoting base 12h of the toilet seat 12.

The rotary damper 1 is fixed by placing a base portion (not shown) formed at the bottom of the casing 2 on the top surface of the toilet tank 14 or the like.

The protrusion 5a of the rotary shaft 5 of the rotary damper 1 is inserted into and fixed to the rotary base 11a of the toilet lid 11 facing the hinge bin 13, and when the toilet lid 11 is opened or closed, the rotary shaft 5a along with the hinge bin 13 is fixed. 5 is arranged to rotate.

In this state, when the toilet lid 11 is rotated toward the front from the open lid state shown in FIG. 7 to close it, the hinge bin 13, which is the axis of rotation thereof, also rotates.

This rotation of the hinge bin 13 also causes the rotation shaft 5 of the rotary damper 1 to rotate in the same direction.

As a result, the rotor 4 fixed to the rotating shaft 5 also rotates.

As a result, as shown in FIGS. 5 and 6, first, among the movable plates 7, the movable plate 7 whose convex pillars 7b are engaged with the concave grooves 48 formed in the narrowest width of the rotor 4 starts rotating in the X direction. This rotation causes viscous liquid 8
The shearing resistance acts, the rotational force of the rotor 4 and rotating shaft 5 is reduced, and the closing speed of the connected toilet lid 11 becomes slow. In this case, in the movable plate 7 in which the convex column 7b is engaged with the other wide concave grooves 4b, 4c, the convex column 7b has a predetermined play in relation to the concave grooves 4b, 4c. Therefore, the rotor 4 does not rotate while it rotates to a predetermined angle.

Next, when the rotor 4 rotates by a predetermined angle, the side wall of the groove 4b, which is formed wider than the groove 48,
b comes into contact with the convex pillar 7b of the movable plate 7 inserted into the plate 7, and rotates the plate 7 in the X direction. As a result, the movable plate 7 rotates as the rotational torque increases.
The number of will increase. Therefore, the shear resistance of the viscous liquid due to the movable plate 7 and the fixed plate 6 becomes even greater.

Furthermore, when the rotor 4 rotates by a predetermined angle, the side wall of the groove 40 formed with the largest width comes into contact with the convex column 7b of the movable plate 7 inserted into the groove 40, causing the plate 7 to rotate. let As a result, all movable plates 7
rotates, and the shearing resistance exerted is also the greatest.Therefore, when the rotational torque of the toilet lid 11 is at its maximum, the greatest braking force is applied accordingly.

According to the rotary damper 1 of this embodiment, the shearing resistance gradually increases even when the toilet lid 11 etc. is opened from the open state. In this case, in order to prevent such shearing resistance from acting upon opening, for example, a one-way clutch (not shown) is disposed between the hollow part of the rotor 4 and the rotating shaft 5, and when opening, the rotating shaft 5 only rotates independently,
The one-way clutch engages with the rotating shaft 5 only when opened,
It is also possible to adopt a configuration in which the rotor 4 and the movable plate 7 rotate together with the rotating shaft 5.

In addition, in the above explanation, the outer cylinder 2 is fixed and the rotor 4 is
Although the explanation has been made regarding the operation in the case where the rotary shaft 5 is rotated, the rotor 4 and the rotary shaft 5 may be fixed and the outer cylinder 2 may be rotated.

In this case, when the outer cylinder 2 rotates, for example, in the Y direction in FIG. 5, the fixed plate 6 also rotates in the same direction.
and the movable plate 7 rotate together. Therefore, the shear resistance provided by both plates 6.7 does not work up to this angle. On the other hand, when rotated by a predetermined angle, among the plurality of movable plates 7, the movable plate 7 that is engaged with the narrowest groove 4a of the rotor 4 comes into contact with the side wall of the groove 48, and the rotation is forced to stop. As a result, shear resistance is generated between the movable plate 7, which has stopped rotating, and the fixed plate 6, and a predetermined braking force is exerted. As the outer cylindrical body 2 further rotates, the number of movable plates 7 that stop increases, and the braking force gradually increases as in the above explanation.

(Embodiment 2) FIGS. 8 to 11 show essential parts of an embodiment according to the second invention.

That is, the rotary damper of this embodiment has almost the same structure as the above embodiment, but the outer cylindrical body 20 has a
Two or more types of grooves 20a, 20b are formed along the axial direction and have different widths.

20c. These grooves 20a, etc. are a pair of grooves 20a, 20a facing each other, similar to the above embodiment.
20b, 20b, and 20C920c are formed in three different widths, each having the same width.

Further, as shown in FIG. 8, the fixing plate 60 is formed into a substantially annular shape having a hole 60a (formed therein) with an inner diameter larger than the outer diameter of the rotor shaft 40 in the center, and A convex portion 60b protruding inward on the inner peripheral portion forming the portion 60a.
It is configured with As shown in FIG. 10, the convex portion 60b is fitted and fixed in a locking groove 40a formed along the axial direction on the outer circumference of the rotor shaft 40.

Here, the rotor shaft 40 is formed into a substantially cylindrical shape, but has the same function as the rotor 4 and the rotating shaft 5 of the above embodiment, and similarly to the above embodiment, the rotor part and the rotating shaft part are connected to each other. Of course, it may also be formed by.

The movable plate 70 is formed into a substantially annular shape as shown in FIG. Five pieces 70b projecting outward are formed.

The fixed plates 60 and the movable plates 70 are alternately loaded around the rotor shaft 40 as in the above embodiment, and the five pieces 70b of the movable plates 70 are arranged in different grooves in the outer cylinder 20. 20a, 20b, and 20c, respectively. Further, a lid member (not shown) is attached to the end of the outer cylinder 20, as in the above embodiment, and a viscous liquid is interposed between the plates 60 and 70.

In the rotary damper according to this embodiment, a fixing plate or the like (not shown) for fixing to a door opening frame or the like is fixed to the outer wall of the outer cylinder body 20 along its axial direction, and is used as a door hinge or the like. . Therefore, when the outer cylinder body 20 rotates, for example, in the X direction in FIGS. 10 and 11 through the fixing plate due to the rotation of the door, etc., the narrowest groove of the outer cylinder body 20 is first rotated. The movable plate 70 engaged with the width groove 20a rotates. As a result, similar to the above embodiment,
Shearing resistance of the viscous liquid by the movable plate 70 and the fixed plate 60 acts. When the outer cylinder body 20 further rotates by a predetermined angle in the X direction, the side wall of the groove 20b, which is wider than the narrowest groove 20a, engages with the groove 20b. The movable plate 70 that contacts the piece 70b and has the five pieces 70b is rotated. As a result, the number of rotating movable plates 70 increases, and the shear resistance also increases accordingly. When the outer cylindrical body 20 further rotates, all the movable plates 70 rotate, for example, just before reaching the final time of the closing rotation, as in the above embodiment.
The greatest braking force is applied.

Note that in this embodiment as well, the outer cylindrical body 20 may be fixedly disposed and the rotor shaft 40 may be rotated, as in the above embodiments. In this case, when the rotor shaft 40 rotates, the fixed plate 60 and the movable plate 70 first rotate together, and when a predetermined angle is reached, the movable plate 7 rotates one after another.
As the number of 0's decreases, the shear resistance exerted by relative rotation of the fixed plate 60 and the movable plate 70 gradually increases.

Further, in each of the above embodiments, the grooves provided on the outer periphery of the rotor or the inner periphery of the outer cylindrical body are formed with three different widths, but the present invention is not limited to this, and two or more types , any number of types may be used. Further, although an example has been shown in which the rotary damper 1 is applied to opening and closing the toilet lid 11, a door hinge, etc., it may also be applied to opening and closing the toilet seat 12. It goes without saying that the present invention may also be applied to opening/closing lids of pianos, record players, portable computers, copy machines, and other various devices.

[Effects of the Invention] According to the rotary damper of the present invention, a plurality of concave grooves having different widths are provided on the outer circumference of the rotor or on the inner circumference of the outer cylinder, and five pieces of the plurality of movable plates are each provided with a plurality of grooves having different widths. Because they are inserted into different grooves, the rotation angle increases (as the rotation angle increases, the shear resistance of the viscous liquid generated by the relative rotation of the movable plate and the fixed plate gradually increases. It is suitable as a rotary damper used to reduce and dampen the rotational torque of a rotating body whose rotational torque gradually increases, such as a falling rotating object.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the rotary damper according to the first invention, FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a perspective view showing the rotor, and FIG. 3 is a fixed plate. A plan view, FIG. 4 is a plan view showing the movable plate, FIG. S is a sectional view showing the arrangement of the fixed plate, rotor and outer cylinder, and FIG. FIG. 7 is a sectional view showing the relationship, and FIG. 7 is a perspective view showing an example in which the rotary damper of the same embodiment is applied to a Western-style toilet bowl. 8 to 11 show an embodiment of the rotary damper according to the second invention, and FIG. 8 is a plan view showing a fixed plate;
Figure 9 is a plan view showing the movable plate, Figure 1O is a sectional view showing the arrangement of the fixed plate, rotor and outer cylinder, and Figure 11 is a diagram showing the arrangement of the movable plate, rotor and outer cylinder. It is a sectional view. 1...Rotating damper 2.20...Outer cylinder body 3...Lid member 4...Rotor 40...Rotor shaft 5... ... Rotating axis 6.60 ... Fixed plate 7.70 ... Movable plate 8 ... Viscous liquid

Claims (2)

[Claims] (1) It has a plurality of grooves formed along the axial direction and with two or more different widths on the outer periphery, and at least a part is loaded into the outer cylinder and is attached to the outer cylinder. is a rotor which is arranged to be relatively freely rotatable, and whose axial direction is aligned with the axial direction of the rotor, and whose at least one end is integrally or connected to and fixed to the rotor, with at least one end protruding outward from the outer cylinder body. The rotating shaft disposed in the central part, the convex part formed on the outer periphery of the outer cylindrical body, and the convex part formed on the outer periphery are fitted and fixed in the engagement groove along the axial direction formed on the inner wall of the outer cylindrical body. a fixing plate formed to have an inner diameter larger than the outer diameter of the rotor; an outer diameter dimension smaller than the inner diameter of the outer cylinder;
A hole provided in the center thereof is formed to have an inner diameter larger than the outer diameter of the rotor, and the inner peripheral portion forming the hole has the narrowest width among the plurality of grooves provided in the rotor. a movable plate formed with a convex piece capable of engaging with a groove formed in the rotor; A rotary damper characterized in that the rotor is inserted around the rotor so as to be engaged with different grooves of the rotor so as to face each other, and a liquid of an appropriate viscosity is interposed between the contact surfaces. (2) an outer cylindrical body having a plurality of grooves formed along the axial direction and with two or more different widths on the inner circumference; A rotor shaft that supports the cylindrical body relatively freely rotatably, a convex portion formed on the inner circumferential portion is fitted and fixed into an engagement groove along the axial direction formed on the inner wall of the rotor shaft, and the outer diameter a fixing plate having an inner diameter smaller than the inner diameter of the outer cylinder; an outer diameter smaller than the inner diameter of the outer cylinder;
A hole provided in the center part is formed to have an inner diameter equal to or larger than the outer diameter of the rotor shaft, and a recess formed in the outer peripheral part has the narrowest width among the plurality of grooves provided in the outer cylinder. a movable plate formed with a convex piece that can engage with a groove, and a plurality of fixed plates and a movable plate are arranged alternately, and the convex piece of each movable plate is arranged in a different concavity of the outer cylinder body. A rotary damper characterized in that the rotor shafts are inserted around the rotor shaft so as to be engaged with the respective grooves so as to be brought into contact with each other, and a liquid of an appropriate viscosity is interposed between the contact surfaces.