JPH02203034A - Multi-disk type damper using viscous fluid - Google Patents

Abstract

PURPOSE:To allow the resisting force to be changed easily and steplessly by interposing an adjusting belt, which variably adjusts a clearance between a movable disk and a housing, and rotatably providing an adjusting screw enabling an internal contour to be variably adjusted of the adjusting belt. CONSTITUTION:An adjusting belt 9 is placed in the periphery of a housing 1 and fitted to its annular recessed groove streak 1f, and the belt 9, when its internal contour is variably adjusted so as to be decreased by an adjusting screw 10, deforms the housing 1 by tightening its peripheral wall 1c. By decreasing the internal contour of the belt, a clearance between the internal peripheral surface of the housing 1 and the peripheral surface of variable disks 7, 7', 7'' is changed smaller, thus adjusting viscous shear resisting force by viscous fluid A. The adjusting screw 10 is rotated, when the adjusting belt 9 is further decreased in its internal contour, the housing 1 decreases smaller also its internal contour coming into contact with the peripheral surface of the variable disks 7, 7', 7'' generating friction force, and resisting force is maximized by additionally giving the friction force to the viscous shear resisting force.

Description

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

(Prior art) Conventionally, this type of damper is shown in Fig. 5 (a) and (b).
As shown in FIG. 1, there is a rotating shaft in the housing a which can be freely rotated by an external force, and a required number of movable disks c, c'e, ..., these movable disks c, c'c, ...... are arranged alternately, and are not interlocked with the rotation of the rotating shaft due to engagement with the housing a, but the plate thickness A required number of fixed disks d, which are freely variable in the direction.

d', d''...... are arranged, and these movable disks c, c'c, ...... and fixed disk d
, d', d, etc., in which a viscous fluid e filled in the housing d is interposed between the plate surfaces, and the following as shown in FIG. 6 proposed by the applicant. There are things like.

The latter configuration has fixed disks d, d', d"
. . . is not interlocked with the rotation of the shaft for one rotation due to engagement with the housing a, but is movable in the plate thickness direction (axial direction), and the movable discs c, c'c .

. . . can also be freely varied 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, . The fixed disks d, d', d'', etc. of the set are relatively interlocked, and at this time both disks c, c'c, ・
......, d, d', d''..., the viscous shear resistance caused by the viscous fluid between them can be used to exert a buffering effect against the external force, whereas in the latter case, Due to the difference that the movable disks c, c'c, '', etc. on the rotating shaft are movable in the thickness direction, the distance between the fixed disk and the movable disk is the same during the rotation. However, in any case, the movable disks c, c'c, . . . are rotated together with the rotating shaft.

(Problem to be Solved by the Invention) Therefore, even in the above-mentioned side damper, the movable disks c, c', c, ... and the fixed disks d, d', which are the determining factors of the resistance force, , d''..., the viscous shear resistance due to the viscous fluid between the two disks remains constant.2For example, if the rotational torque applied to the rotating shaft due to an external force changes, the viscous shear resistance will be constant. If you try to adjust it so that it rotates at the speed of 1 movable disk c, c', c
,...Fixed disk d, d", d"...
...the gaps between these discs c, c, c, ”
..., d, d', d"... By changing the plate area, etc., the viscous shear resistance itself is changed, thereby adjusting the braking force. Therefore, in the end, the above-mentioned gap is changed. In order to increase or decrease the plate area, the number of discs must be increased or decreased.As a result, it not only takes time and effort to increase the braking force, but also the adjustment is done in stages and cannot be done steplessly. This is not possible, so when you want to rotate at a constant speed in response to a change in torque, or change the rotation speed in response to a constant torque, this type of damper has a damper whose braking force changes due to temperature changes. Therefore, in such cases, it is desirable to keep the braking force constant, but fine adjustment of the braking force is not possible in any of these cases.

The present invention has been made in view of the above-mentioned problems of the conventional damper.The movable disk is rotatable together with the movable shaft, and the fixed body (the fixed disk, one of the inner surfaces of the housing, or In order to enable the outer periphery of the movable disk and the inner periphery of the housing to come into contact with each other and to freely change the clearance between the two, in the damper which is non-interlocked,
By interposing an adjustment belt whose inner diameter is freely variable, and by providing a configuration in which an adjustment screw whose inner diameter of the adjustment belt is freely variable is rotatably disposed on the side of the case, the adjustment screw can be adjusted. By tightening the housing with an adjustment belt that can freely reduce the diameter, the housing is reduced in diameter so that the clearance with the movable disk changes, and by tightening the adjustment screw, the outer circumference of the movable disk and the inner surface of the housing By allowing contact friction to occur between the
The purpose of this is to make it possible to exert a braking force that includes frictional force, thereby making it possible to easily change the resistance force steplessly.

(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 rotatable by an external force in a housing sealed with a case, and a movable disk that is rotated together with a movable shaft that is rotatable by an external force. A fixed body is disposed adjacent to the housing and is not interlocked with the rotation of the movable shaft by engagement with the housing, and the viscous fluid in the housing is interposed between the movable disk and the fixed body. In the damper, the housing has a variable inner diameter so that the outer surface of each of the movable disks can come into contact with the inner peripheral surface of the housing, and the clearance between them can be varied. A multi-plate damper using viscous fluid, characterized in that a belt is interposed therein, and an adjustment screw is rotatably provided on the side of the case and allows the inner diameter of the adjustment belt to be varied. This is what we are trying to provide.

(Function) Since the movable shaft is rotated by applying an external force to the movable shaft as a rotational force, the movable disk attached to the movable shaft is rotated together with the movable shaft within the viscous fluid of the housing. At this time, a viscous shearing resistance force is generated by the viscous fluid between the movable disk and the fixed body, which is one or both of the inner surfaces of the housing of the stationary disk 2 in the static state, and this acts as resistance against external force. This will serve as a damper.

Turn the adjustment screw in the direction that tensions the adjustment belt.
Since the inner diameter of the MU adjustment belt becomes smaller and the housing is tightened, the inner diameter of the housing becomes smaller and the clearance between its inner surface and the outer circumferential surface of the movable disk changes to a smaller value, so the above-mentioned viscous shearing resistance increases. .

When the adjusting screw is further rotated, the inner diameter of the adjusting belt becomes smaller, and by further tightening the housing, the inner diameter of the housing is changed to a smaller value, and its inner circumferential surface comes into frictional contact with the outer circumferential surface of the movable disk, and at this time, both Frictional force is generated between them, and the movable shaft exerts a large resistance force against external force.

That is, depending on the degree of tightening of the adjustment belt by the adjustment screw, the resistance force against the external force of the movable shaft is steplessly tIIWJ within a wide range.

(Example) Examples of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, the housing l, which has an inverted concave shape in cross section, has a shaft hole 1b passing through the center of its top wall 1a, and is vertically elongated facing the inner surface of the peripheral wall IC. Recessed grooves 1d, ld, ld, and ld are provided.

Further, the housing 1 has a plurality of vertical grooves le, is... as shown in FIG. 4, on the outer peripheral surface of the peripheral wall IC, in order to facilitate deformation by tightening the adjustment belt, which will be described later.
... are recessed, and an annular recessed groove 1f into which an adjustment belt (to be described later) is fitted is provided around the outer circumferential surface at a substantially intermediate portion in the depth direction.

The movable shaft 2 is supported such that its base end (upper end in FIG. 1) is fitted into the shaft hole 1b, so that it is located on the center line of the housing l and is rotatable in the direction around the axis. At the same time, the distal end thereof is fitted into a shaft hole 3a passing through the center of the bottom wall of the case 3 of the housing 1, and the movable shaft 2 is prevented from moving in the axial direction.

The case 3 is externally mounted on the peripheral wall 1c of the housing 1 to close it off, and sealing is also performed between the case 3 and the housing 1 and between the shaft holes 1b, 3a and the movable shaft 2 by known sealing means. It is kept secretly in the armpit.

A square shaft 4 that fits into the square hole 2a penetrated through the center of the movable shaft 2 is fitted into the square hole 2a of the square shaft 4.
A square hole 5a of an arm 5 on which a rotational force as an external force acts is fitted into the square head 4a protruding upward from a, and in order to prevent the arm 5 from being pulled out, the retaining screw 8 It is screwed into a screw hole (not shown) provided in the end face of the square head 4a.

In this way, the housing 1 closed by the case 3 contains a viscous fluid A made of a viscous polymer material such as polyisobutylene, pitch or high viscosity wood glass, etc. Inside A are the required number of movable disks, that is, three movable disks 7.7' and 7'' in the illustrated example.
and two fixed disks 8,8° as fixed bodies,
They are arranged alternately in the vertical direction in the following manner.

That is, at a portion of the movable shaft 2 located inside the housing 1, four engaging recesses 2b, 2b, . , vertically mounted recessed, while each of the movable disks 7.7°, 7
A shaft hole 7a is opened at the center of the shaft hole 7a with an inner diameter that allows the movable shaft 2 to fit therein, and four engaging claws ?b, 7b, . - is the above-mentioned engagement recess 2b,
The engaging claws 7b are protruded toward the center at positions equally spaced in the circumferential direction corresponding to the engaging claws 7b...
... are engaged with the engagement recesses 2b..., and as the movable shaft 2 rotates, each movable disk ? ,? ',? ” are also rotated at the same time.

In the illustrated example, two of the three movable discs 7.7°, 7" have the same shape, and the other movable disc 7" has the same shape as the movable disc 7.7". Although the movable disks 7.7' and 7 have different shapes,
``'' may all have the same shape or may all have irregular shapes.

Next, each fixed disk 8, 8'', which is a fixed body, has a shaft hole 8a formed at its center with a size that allows the movable shaft 2 to fit therein, and is not interlocked with the rotation of the movable shaft 2. The movable shaft 2 is loosely inserted into each of the shaft holes 8a.

Further, a retaining protrusion 8b is provided on the outer peripheral edge of each fixed disk 8.8'.
. . . are provided symmetrically in a protruding manner, and each time the right projection piece 8b . As a result, the fixed disk 8.8'' does not follow the rotation of the movable shaft 2, and only changes in the plate thickness direction are caused by the movable disk. ,? '.

7”, it is in a free state.

In this way, in the damper that is formed so that a resistance force acts upon application of rotational force to the movable shaft 2, the above resistance force is not only viscous shear resistance force due to viscous fluid but also In order to make it possible to include frictional resistance as well as to make it possible to adjust the resistance force steplessly, the following configuration is provided.

That is, the housing l is provided with an adjustment belt 9 whose inner diameter is freely variable.

On the other hand, the case 3 is provided with a recess 3b inside the - side thereof, and as shown in FIGS.
A shaft bearing portion 3C communicating with the shaft bearing portion 3C is passed through laterally, and is fitted into the shaft bearing portion 3C and disposed inside the recess portion 3b, and is capable of tensioning the adjustment belt 8. An adjustment screw 10, which can be made smaller by 1lffi, is installed so that it can freely rotate around the axis and is prevented from moving in the axial direction.

The above-mentioned adjustment bell) 9 may be formed into a band shape of steel plate, plastic, leather, etc., or may be formed with a wire lobe or the like.

The illustrated adjustment belt 8 is made by bending a band-shaped steel plate into an annular shape, and has both ends 9aJb facing outward and parallel to each other with a margin for appropriate tightening. The adjustment screw 10 is inserted into the shaft hole 9b bored in the portion 9a so as to be freely rotatable, and the other end portion 9a is provided with a screw hole 9d, into which the screw portion 10a of the adjustment screw 10 is screwed. By rotating the adjusting screw 10 in the screwing direction, the other end 9b moves along the threaded portion tOa toward the one end 9a, as shown in FIG. 3, thereby tightening the adjusting belt. 9 is tensioned so that its inner diameter becomes smaller.

Further, the illustrated adjustment belt 9 is located on the outer periphery of the housing 1 and is fitted into the annular groove 1f thereof, and when the inner diameter of the adjustment belt 9 is changed to be smaller by the adjustment screw 10 as described above. , the peripheral wall 1c of the housing l is tightened, the housing 1 is deformed, and its inner diameter is reduced, so that the inner peripheral surface of the housing l and the movable disk ?
,? ',? The clearance B with the outer circumferential surface of the is belt 9 changes slightly, thereby adjusting the viscous shear resistance force caused by the viscous fluid A. However, the arrangement position of the is belt 9 is limited to that shown in the illustration. The resistance force can be adjusted even if it is arranged inside the housing l.

Further, as the housing 1 is deformed by the adjustment belt θ, the inner circumferential surface thereof and the movable disk 7.
However, when the adjusting belt 9 is disposed inside the housing l as described above, the adjusting belt 9 contacts the movable disk 7...
It comes into direct contact with the outer peripheral surface of the

The adjustment screw 10 also has a flange 10 near its base end.
b is integrally provided, and this flange 10b abuts against the inside of the shaft bearing portion 3c, thereby preventing the adjustment screw 10 from being removed due to movement.

Furthermore, it is also possible to use a worm gear for the adjustment screw IO, and in this case, the worm gear and the other end 9b of the adjustment belt 8 are engaged with each other.

In addition, although the illustrated example is composed of three movable disks 7.7° and 7'' and two fixed disks 8 and 8', in addition to these, a plurality of required movable disks 7... ...
It is also possible to have only one movable disk 7 and a fixed disk 8, and if the fixed disk 8 is not adopted, the inner surface of the housing 1 is
Like the fixed disk 8, it plays the role of a fixed body.

Therefore, when the above-mentioned damper is used, for example, in a lift hanger, the movable shaft 2 rotates as an external force acts on the arm 5 as a rotational force, and together with the movable shaft 2, the movable disc 7... ... rotates, so viscous shearing resistance acts on it, but the inner periphery of the housing 1 and the movable disk 7...
When the clearance B with the outer circumferential surface of . . . is at its maximum as shown in FIG.

When the housing 1 is deformed so that its inner diameter becomes smaller by rotating the adjustment screw lO and reducing the inner diameter of the adjustment belt 9, the clearance date changes to a smaller value,
The viscous shear resistance increases.

Furthermore, as the adjusting screw 10 is rotated to make the inner diameter of the adjusting belt 9 smaller, the inner diameter of the housing l also becomes smaller and comes into contact with the outer peripheral surface of the movable disk 7, so that the above-mentioned clearance is reduced. Since the day becomes almost 0 and a frictional force is generated between the two, the frictional force is added to the viscous shearing resistance force, and the resistance force becomes maximum.

Incidentally, the volume change when adjusting the resistance force can be controlled by the elasticity of the housing 1.

(Effects of the Invention) Since the present invention is constructed as described above, the inner diameter of the housing can be varied by an adjusting screw and a variable adjustable belt, and the inner circumference of the housing and the movable shaft can be changed. By changing the clearance between the outer circumferential surface of the movable disk that is linked to rotation, and by making it possible for the inner circumference of the housing to contact the outer circumferential surface of the movable disk, the viscous shearing resistance force can be adjusted simply by changing the clearance. Instead, the frictional resistance between the inner periphery of the housing and the outer periphery of the movable disk can also be used, and as a result, compared to the conventional damper that uses only viscous shear resistance, a large resistance force can be obtained with the same volume, and the resistance Not only can the adjustable range of force be widened, but also the resistance force can be adjusted steplessly within that range.

In addition, since it uses the outer circumference of a movable disk that moves in a circular motion, the larger the diameter, the more efficient the resistance force is.
Furthermore, since the adjustment screw is rotated on the side of the housing or case, the thickness of the damper can be kept low, and it is also possible to make it vertically symmetrical.

[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, and FIGS. 2 and 3 are transverse plan views of the same embodiment when no adjustment is made and when adjustment is made, respectively. Fig. 4 is an exploded perspective view of the same embodiment, Figs. 5(a) and 5(b) are longitudinal sectional front views and transverse plan views showing a conventional multi-plate damper using viscous fluid, and Fig. 6 is another conventional multi-plate damper. FIG. 2 is a longitudinal sectional front view showing a multi-plate damper according to an example. l... Housing 2... Movable shaft 3... Case 7.7°, 7-... Movable disc 9... Adjustment belt 10... ... Adjustment screw A ... Viscous fluid B - 6 Φ Clearance agent Patent attorney Yoshio Saito Figure Figure Figure Figure

Claims (1)

[Claims] In a housing sealed by a case, there is 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 arranged next to the movable disk and that engages with the housing to cause the rotation of the movable shaft. In a damper in which a non-interlocking fixed body is disposed, and the viscous fluid in the housing is interposed between the movable disk and the fixed body, the viscous fluid is connected to the outer periphery of each of the movable disks and the inner circumferential surface of the housing. In order to enable contact between the two and to freely change the clearance between them, an adjusting belt having a variable inner diameter is interposed in the housing, and a variable inner diameter of the adjusting belt is provided on the side of the case. A multi-plate damper using viscous fluid, characterized by a rotatable adjustment screw.