JPH02186143A - Multi-disc type damper using viscous fluid - Google Patents

Abstract

PURPOSE:To change braking force steplessly by forming a spline at a movable shaft, engaging each movable disc in the state of being free in the axial, peripheral and diametral directions to the required extent and providing an adjusting screw for deforming the shape of a housing at the side part of a cap body. CONSTITUTION:In each of movable discs 7, 7', 7'', engaging claws 7b... are protruded from the inner periphery of a shaft hole 7a and engaged with the spline 2d of a movable shaft 2. The engaging claws 7b... are also engaged to the spline 2d in the state of being free in the axial direction as well as free with clearances G, E in the diametral and peripheral directions. When an adjusting screw is screwed in, an elastic deforming part 1e is pressed to be deformed, the movable disc 7' is shifted by an inner face 1g, a clearance H between the movable disc 7' and the peripheral wall 1c of a housing 1 is changed, and thus contact friction is eventually generated. The braking force of the movable shaft 2 can be enlarged in both viscous shearing resistance and frictional resistance by using a viscous fluid A as well as regulated steplessly.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention uses a viscous polymer fluid such as polyisobutylene or other viscous fluid, and utilizes its viscous shear resistance and frictional resistance between members. to gain resistance,
The present invention relates to a multi-plate damper that can be used for various purposes and uses the resistance force to exert a buffering effect against external forces, that is, a braking force.

(Prior Art) Conventionally, as shown in FIG. 5, this type of damper has a rotary shaft that is rotatable by an external force, and a rotary shaft that is perpendicular to the rotary shaft that is rotatable in the housing a, as shown in FIG. Fixed required number of movable disks c, c"c;"...
...and these movable disks C9c'c, ...
The required number of fixed disks d, d', d'', which are not interlocked with the rotation of the rotating shaft due to their engagement with the housing a, but are freely variable in the plate thickness direction, are arranged alternately with the housing a.・・・
... are arranged, and these movable desks C, C'C,
...and fixed disks d, d', d''...
A viscous fluid e filled in the housing δ between the plate surfaces of
There are some that have a 3-dimensional structure interposed therebetween, and some that I like, as shown in FIG. 6, which is a previous application filed by the applicant.

The latter configuration has fixed disks d, d', d"...
... are not interlocked with the rotation of the shaft for one rotation due to engagement with the housing 8, but are movable in the plate thickness direction (axial direction), and the movable disks c, c'c, ... ...
・It is designed to be able to vary freely in the thickness direction.

Therefore, in the former case, when an external force as a rotational force is applied to the rotating shaft, the movable disks c, c'c, . d, d', d"...... are relatively interlocked, and at this time both disks c, c'c,...
..., d, d', d'', . . . By utilizing the viscous shear resistance caused by the viscous fluid between them, a buffering effect against the external force can be exerted.

On the other hand, in the latter case, the movable disks c, c'
c, 2. Although there is an advantage that the separation distance between the fixed disk and the movable disk is equalized during operation due to the difference that it can vary freely in the plate thickness direction,
In all cases, the movable disks c, c'c, . . . are rotated simultaneously with the rotation axis and by the same angle.

(Problem to be Solved by the Invention) Therefore, in each of the above-mentioned dampers, the movable discs c, c', etc., and the fixed discs d, d', which are the determining factors of the resistance force.・When the disks are moved relative to each other (during operation), the viscous shearing resistance due to the viscous fluid between the two disks becomes constant, and therefore, for example, in response to a change in the rotational torque of the external force on the rotating shaft, the disks move at a constant speed. When trying to adjust the rotation, move the movable discs C, C'...
..., the gap between the fixed disks d, d'... is reduced, and these disks C1C°...,
The braking force is adjusted by increasing the plate area of d, d', etc. to increase the viscous resistance itself.

Changes in the gap and plate area are made by increasing or decreasing the number of discs, so adjusting the braking force not only takes time and effort, but also requires step-by-step adjustment. Since it is not possible to make the damper stepless, it is necessary to make it rotate at a constant speed in response to changes in torque, or to change the rotation speed in response to a constant torque, and for this type of damper, the braking force changes due to temperature changes. This means that it is not possible to make fine adjustments to the case.

The present invention has been made in view of the above-mentioned problems of the conventional damper, and a spline is formed on the movable shaft, and the fixed body (one or both of the fixed disk and the inner surface of the housing) is fixed against the rotation of the movable shaft. The 9 movable disks are not interlocked due to engagement with the housing, while each movable disk 9 is freely engaged with the spline of the movable shaft in the axial direction, and has clearance in the circumferential direction and diametrical direction, so that it is free to a predetermined degree. When the tAW1 screw is engaged in the state and the shape of the housing can be changed so that the clearance between the outer circumference of the movable disk and the inner circumference of the housing can be changed before contact friction can occur between the outer circumference of the movable disk and the inner circumference of the housing, the cover is closed. By having a configuration that is screwed onto the side of the body.

'' The shape of the housing is deformed by the two-legged mfIS screw, whereby the movable disk is moved in the opposite direction by the housing, the clearance between the outer circumference of the movable disk and the inner circumferential surface of the housing is changed, and the screw of the adjustment screw is also changed. The outer periphery of the movable disk and the inner surface of the housing are brought into contact with each other, and the braking force can be changed steplessly by viscous resistance and frictional force, allowing rotation at a constant speed in response to changes in the torque of the movable shaft. The purpose is to be able to change the rotational speed with respect to a constant torque, and also to be able to change the braking force in response to changes in the damper force due to temperature changes.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a movable disk that is rotated together with a movable shaft that is freely rotatable by an external force, and a movable disk that is rotated together with a movable shaft that is rotatable by an external force in a housing that is sealed with a lid. A fixed body is disposed adjacent to the housing and is not interlocked with the rotation of the movable shaft due to engagement with the housing, and the viscous fluid in the housing is interposed between the movable disk and the fixed body. In the damper, a spline is formed on the movable shaft, and each of the movable disks is free in the axial direction from the spline and has a clearance in both the circumferential direction and the diametrical direction to a required degree. is engaged in a free state, the clearance between the outer periphery of the movable disk and the inner periphery of the housing is variable, and contact between the two is made possible.
The object of the present invention is to provide a multi-plate damper using viscous fluid, characterized in that an adjusting screw that allows the shape of the housing to be freely deformed is hinged to the side of the lid.

(Function) When an external force is applied to the movable shaft as a rotational force, the movable shaft is rotated, but the splines and each movable disk have clearances in the circumferential direction and the diametrical direction, and are engaged in a somewhat free state. During the initial rotation of the movable shaft, the splines are not engaged with each movable disk, and therefore no viscous shear resistance occurs.

Further rotation of the movable shaft brings its splines into engagement with each movable disc, causing the movable disc to rotate with the movable shaft within the viscous fluid of the housing, with the movable disc and stationary discs rotating together within the viscous fluid of the housing. A viscous shearing resistance force is generated between the fixed disk and the fixed body, which is one or both of the inner surfaces of the housing, due to the viscous fluid, and this acts as a resistance against external force, thereby achieving the effect of a damper.

By screwing in the adjustment screw, the peripheral wall of the housing is pressed and deformed inward by the tip of the adjustment screw, and the movable disk within the housing is moved in its diametrical direction and brought closer to the inner surface on the opposite side.

This changes the clearance between the outer periphery of the movable disk and the inner periphery of the housing, so by arbitrarily adjusting this clearance, the viscous shearing resistance force due to the viscous fluid can be adjusted as desired.

When the adjustment screw is further screwed in, the movable disc and the inner surface of the housing come into contact, which generates a frictional force.This frictional force is added to the viscous shearing resistance force, which increases the resistance force of the movable shaft against external force, that is, the braking force. is exerted, and the braking force can be adjusted steplessly.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 4, the housing 1 is formed in the shape of a circular dish, and a shaft hole ib is provided at the center of the bottom wall 1a.
are provided through the peripheral wall 1c, and four vertical grooves ld, ld...
...is recessed.

Further, the peripheral wall 1c of the housing l is provided with a resiliently deformable portion 1e that can be restored, and in this embodiment, this is a thin-walled portion having a substantially mouth-shaped front face on the outer peripheral surface of the peripheral wall IC! t, and is elastically deformed inward by pressing the thick part at the center, and the housing 1 is thereby deformed into a non-circular shape.For this reason, the housing 1 is made of synthetic resin or the like. The elastic deformation is considered to be rotation.

The movable shaft 2 is connected to the housing 1 by fitting the circular shaft portion 2a at the lower end into the shaft hole 1b in a liquid-tight manner.
The circular shaft portion 2b at the upper end of the movable shaft 2 is fitted into a shaft hole 3a that extends through the shaft center of the lid body 3 of the housing l. are combined.

The lid 3 is fitted and closed from the open upper end of the housing 1, and the space between the shaft hole 3a and the movable shaft 2 is also kept liquid-tight by a known sealing means.

A square shaft 4 formed to fit therein is fitted into a square hole 2C penetrating through the axis of the movable shaft 2, and a square head protruding from the square hole 2C of the square shaft 4. The square hole 5a of the arm 5 on which the rotational force acts as an external force is fitted into the part shaft, and in order to prevent the arm 5 from being pulled out, a retaining screw 8 is drilled into the end face of the square head 4a. It is screwed into a provided screw hole (not shown).

In this way, the housing l closed by the lid body 3
A viscous fluid A such as a viscous polymer material such as polyisobutylene, pitch or high viscosity water glass is accommodated inside the viscous fluid A, and the required number of sheets are contained in the viscous fluid A.
That is, in this embodiment, three movable disks 7.7°, 7'' and two fixed disks 8, 8'' as fixed bodies are arranged as follows so that they are arranged alternately in the vertical direction. has been done.

That is, a spline 2d is formed at a portion of the movable shaft 2 located inside the housing 1, while a shaft hole 7 is formed at the center of each movable disk 7.7', 7''.
a is the inner diameter of the spline 2 in the movable shaft 2.
The diameter is made larger by a required dimension than the diameter D° of d, and the opening is made to maintain a clearance 8 between the two.

From the inner periphery of the shaft hole 7d, a plurality of (four in the illustrated example) engaging claws 7b protrude toward the center at equal intervals in the circumferential direction. 7b... are engaged with the splines 2d, so that the movable disks 7.7', 7'' also rotate with the rotation of the movable shaft 2.

The 7°, 7" engaging claws 7b are free in the axial direction (vertical direction) with respect to the spline 2d, and in the diametrical and circumferential directions as shown in FIG. They are engaged so that they have clearances C and E of the required dimensions, respectively, and are in a free state for a predetermined length.

Also, each of the movable disks 7.7', ? The outer diameter F of " is smaller than the inner diameter G of the housing l by a required dimension, and a clearance H is maintained between the outer circumference of each of the movable disks 7.7° and 7" and the inner circumferential surface of the housing 1. However, this clearance H is for each movable disk 7...
As shown in FIG. 4, the dimensions are set such that the slider 7 lance C can be moved in the diametrical direction thereof.

Next, each of the fixed disks 8, 8°, which are the fixed bodies, has a shaft hole 8a formed in its axial center with an inner diameter I larger than the diameter D′ of the spline 2d in the movable shaft 2, The fixed disk 8.8° is loosely inserted into the movable shaft 2 so that it is not interlocked with the rotation of the movable shaft 2.

In addition, there is a rotating projection piece 8b on the outer peripheral edge of each fixed disk 8.8゛.
A plurality of (four in the illustrated example) protrude symmetrically, and the rotating protruding pieces 8b... are the vertically elongated concave grooves 1d of the housing 1. As a result, the fixed disks 8, 8° do not follow the rotation of the movable shaft 2, and the movement in the axial direction is caused by the movement of the movable disk 7.
It is in a free state like...

Furthermore, a screw hole 3 is provided on one side of the peripheral wall 3b of the lid 3.
c is penetrated laterally, and the adjustment screw 3 is hinged to the screw hole 3C so that it can move forward and backward.

The screw hole 3c and the adjusting screw 9 are provided at a position corresponding to the elastically deforming portion 1e of the housing 1, and by screwing in the adjusting screw 8, the tip thereof comes into contact with the elastically deforming portion 1e. By screwing in, the elastically deformable portion 1e is compressed and deformed inward, thereby deforming the housing l into a non-circular state, and its inner surface tg compresses and moves the movable disk 7' as shown in FIG. The clearance H between the outer periphery of the movable disk 7' and the peripheral wall 1c of the housing 1 changes, and by further screwing in the adjustment screw 9, the elastic deformation portion 1e and the movable disk 7°
Finally, the outer periphery of the movable shaft 2 comes into contact with the outer periphery of the movable shaft 2 to generate friction, thereby making it possible to use the viscous shearing resistance and frictional resistance caused by the weight of the viscous fluid to create a resistance force against the external force of the movable shaft 2.

Therefore, when the above-mentioned damper is used, for example, in a coat lift hanger for hanging clothes, when an external force acts on the arm 5 as a rotational force, the initial rotation of the movable shaft 2 as shown in FIG. Spline 2d and each movable disk?
,? ',? Since the engaging claws 7a of ``'' do not engage with each other due to the circumferential clearance E, the respective movable disks 7 do not rotate, so that no viscous shearing resistance is applied.

When the movable shaft 2 rotates by the clearance E, its spline 2d and each movable disk 7.7', ? ” engaging claw 7
a... engages with the movable disk 7...
... will rotate together with the movable shaft 2, and for this reason.

Movable disk 7... and non-rotating fixed disk 8
A viscous shearing resistance force based on the viscous fluid A existing between the plate surfaces at 8° begins to act.

By screwing in the adjustment screw 8, the elastic deformation portion 1e of the housing 1 is pressed and deformed inward, and the movable disk 7'' is moved to the opposite side, so that the outer circumference of the movable disk 7'' and the inner circumference of the housing 1 are The clearance H between them changes, and the viscous shear resistance is adjusted.

By further screwing in the adjusting screw 8, the movable disc 7
Frictional force is generated due to contact between the outer periphery of the movable shaft 2 and the inner surface of the elastically deformable portion 1e, and this frictional force and the viscous shearing resistance force act as a braking force on the movable shaft 2.

In this embodiment, three movable disks 7, 7', ? ” and two fixed disks 8.8゛, but a movable disk?...and a fixed disk 8.
It is also possible to increase or decrease the number of discs. Furthermore, if the number of movable discs 7 is only one and the fixed disc 8 is not adopted, the inner surface of the nosing l may be the same as the fixed disc 8. Similarly, it plays the role of a fixed body, and in this case as well, viscous shear resistance and frictional resistance can be applied steplessly to the movable shaft 2.

Also, in this embodiment, three movable disks 7, 7', ? ”
Among them, only the intermediate movable disk 7° is formed to have a large plate thickness, and only the movable disk 7° is the inner surface of the housing l.
In this case, the movable disk 7° is configured to be able to be pressed and moved by the inner surface tg of the elastically deformable portion 1e and to be able to make frictional contact. Moyo〈Also, two or more movable disks?...
. . . can be pressed and moved by the inner surface of the housing l, and may be configured to come into frictional contact with each other.

In each figure, 9a is a rotor, which is rotatably fitted to the tip of the adjustment screw 8.

(Effects of the Invention) Since the present invention is configured as described above, the movable disks exist between the plate surfaces of the plurality of movable disks that are interlocked with the rotation of the movable shaft and the fixed body that is not interlocked with the movable shaft. The inner surface of the housing, which is elastically deformed by screwing in the adjustment screw, moves the movable disk to the viscous shearing resistance caused by the viscous fluid.
By moving the movable disk in the diametrical direction and arbitrarily changing the clearance between the outer circumference of the movable disk and the inner circumferential surface of the housing, desired adjustment can be made. Since it is possible to apply braking force to the movable shaft using both the frictional resistance generated by the contact friction with the outer circumferential surface of the movable shaft and the viscous shearing resistance, the range of action of the braking force can be increased compared to the conventional example. , within the braking force range,
The braking force can be made stepless and can be adjusted minutely.

Therefore, even if the rotational torque as an external force applied to the movable shaft changes, the movable shaft can be rotated at a predetermined speed, or conversely, the rotational torque as an external force on the movable shaft remains constant. In this case, the rotational speed of the movable shaft can be adjusted to change, and the damper force of this type of damper changes depending on temperature changes, but even in such cases, the damper force can also be adjusted in response to temperature changes. It becomes possible.

Furthermore, since an adjustment mechanism such as an adjustment screw can be provided on the side of the housing lid, not only can the damper be formed vertically symmetrically, but also the overall thickness can be reduced, making it possible to miniaturize the product. .

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an embodiment of a multi-plate damper using viscous fluid according to the present invention, Fig. 2 is an exploded perspective view of the same embodiment, wIJ3 Fig. 4, and Fig. 4 are operations in the same embodiment. 5 and 6 are longitudinal sectional front views respectively showing a conventional multi-plate damper using viscous fluid. 1... Housing 2... Movable shaft 2d... Φ Spline 3... Lid body 7.7°, 7-... Movable disc 9... Fist ... Adjustment screw ^ ... Viscous fluid diagram Seki diagram Threshold diagram

Claims (1)

[Claims] In a housing sealed with a lid, there is a movable disk that is rotated together with a movable shaft that is freely rotatable by an external force, and the movable disk is arranged adjacent to the movable disk and rotates the movable shaft by engagement with the housing. and a non-interlocking fixed body, and the viscous fluid in the housing is interposed between the movable disk and the fixed body,
A spline is formed on the movable shaft, and each of the movable disks is free in the axial direction from the spline, and has a clearance in both the circumferential direction and the diametrical direction, and is free to a certain extent. engaged with
In addition, the clearance between the outer circumference of the movable disk and the inner circumferential surface of the housing can be made variable, and the shape of the housing can be adjusted so as to be freely deformable on the side of the lid body to enable contact between the two. A multi-plate damper using viscous fluid characterized by screws that are screwed together.