JPH0461218B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention uses a polymeric 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 is designed to obtain a resistance force, and by this resistance force can exert a buffering effect against external forces, that is, a braking force.

《Prior art》 Conventionally, this type of damper is shown in Fig. 5A,
As shown in (b), inside the housing a, there is a rotary shaft b that can be freely rotated by an external force, and a required number of movable disks c, c'c fixed perpendicularly to the rotary shaft b so that they can rotate together with the rotary shaft b. , ``...'' and these movable disks c, c'c, ''... are disposed alternately, and are not interlocked with the rotation of the rotating shaft b due to engagement with the housing a, but in the thickness direction. The required number of fixed disks d, d′, which are variable,
d″... are arranged, and these movable disks c,
A viscous fluid e filled in a housing a is interposed between the plate surfaces of c'c, ''... and fixed disks d, d', d'', and further proposed by the applicant. There are the following as shown in Figure 6.

The latter configuration has fixed disks d, d′,
d″... is engaged with the housing a, so that the rotation axis b
Although it is not linked to the rotation of
is freely variable and has a movable disk c,
c′c, ″... are also made to be freely variable in the thickness direction.

Therefore, in the former case, by applying an external force as a rotational force to the rotating shaft b, the movable disks c, c', c, ″, etc. rotate together with the rotating shaft b.
...and fixed disks d, d', attached to housing a,
d″……move relative to each other, and at this time both disks c,
By utilizing the viscous shear resistance of the viscous fluid between c′c, ″..., d, d′, d″..., it is possible to exert a buffering effect against the external force, whereas in the latter case, the rotation axis Based on the difference that the movable disks c, c′c, ″... in b are movable in the thickness direction,
There is an advantage that the distance between the fixed disk and the movable disk is equalized during the rotation, but in any case, the movable disks c, c′c, ″... are rotated together with the rotating shaft b. are the same.

<<Problems to be Solved by the Invention>> Therefore, in any of the above-mentioned dampers, the movable disks c, c′, c,″ are the determining factor of the resistance force.
When ... and the fixed disks d, d', d''... are moved relative to each other, the viscous shear resistance due to the viscous fluid between the two disks is constant, so for example, the rotational torque on the rotating shaft b due to an external force is If you try to adjust it so that it rotates at a constant speed when it changes,
Movable disk c, c′, c.″……, fixed disk d,
d′, d″...The gap between these disks c,
The viscous shear resistance itself is changed by changing the plate area of c′, c, ″..., d, d′, d″..., thereby adjusting the braking force. In order to change the above-mentioned gap or change the plate area, the number of discs must be increased or decreased, and as a result, not only is it time-consuming and labor-intensive to adjust the braking force, but the adjustment is step-by-step. This type of damper can be Therefore, in such cases, it is desirable to keep the braking force constant, but in both of these cases, fine adjustment of the braking force is not possible.

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 (fixed disk, one of the inner surfaces of the housing, or For dampers that are not interlocked (both sides),
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, to the housing,
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. An adjustment belt that can freely reduce the diameter tightens the housing to reduce the diameter of the housing, changing the clearance with the movable disk.Furthermore, by tightening the adjustment screw, the outer circumference of the movable disk and the inner surface of the housing are adjusted. By allowing contact friction to occur between the viscosity and the viscous resistance, it is possible to exert a braking force that includes not only viscous resistance but also frictional force. Its purpose is to be changeable.

<Means for Solving the Problems> In order to achieve the intended purpose, the present invention includes a movable shaft that rotates in response to an external force, and a movable shaft that is fitted onto the outer periphery of the movable shaft in a housing sealed with a case. a plurality of movable disks whose movement in the rotational direction is restrained and whose movement in the axial direction is free; and a plurality of movable disks whose movement in the rotational direction is restrained by being engaged with the inner peripheral surface of the housing;
and a plurality of fixed disks that are free to move in the axial direction, these movable disks and solid disks are arranged alternately along the axial direction of the movable shaft, and the viscous fluid filled in the housing is In the damper interposed between the movable disks and the fixed body, the one movable disk has a wider outer peripheral surface than the other movable disk, and the outer peripheral surface of each movable disk and the inner peripheral surface of the housing A clearance for adjusting these intervals is interposed between the housing, and an adjustment belt is wound around the outer periphery of the housing, and the adjustment belt has an adjustment belt for expanding and contracting it in the radial direction. It is characterized by a screw.

<<Operation>> The movable shaft is rotated by applying an external force as a rotational force to the movable shaft, so that 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, the movable disk and the fixed disk in a stationary state,
A viscous shear resistance force is generated between the housing 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.

When the adjustment screw is rotated in a direction that tensions the adjustment belt, the inner diameter of the adjustment belt becomes smaller and the housing is tightened, so the inner diameter of the housing becomes smaller and the clearance between its inner surface and the outer circumferential surface of the movable disk decreases. Since the viscous shear resistance force is changed small, the viscous shear resistance force becomes large.

Further rotation of the adjustment screw reduces the inner diameter of the adjustment belt, 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, the resistance force of the movable shaft against external force can be adjusted steplessly within a wide range by adjusting the degree of tightening of the adjustment belt by the adjustment screw.

<<Examples>> Examples of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, the housing 1, 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 1c. Recessed grooves 1d, 1d, 1d, 1d are provided.

Further, the housing 1 is provided with a plurality of vertical grooves 1e, 1e, . . . on the outer circumferential surface of the peripheral wall 1c, as shown in FIG. In addition, on the outer circumferential surface, an annular groove 1f into which an adjustment belt (to be described later) is fitted is provided around the 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 1 and is rotatable in the direction around the axis. At the same time, its tip end is fitted into a shaft hole 3a penetrating the center of the bottom wall of the case 3 of the housing 1, and the movable shaft 2 is roughly prevented from moving in the axial direction.

The case 3 is externally mounted on the circumferential wall 1c of the housing 1 to close it off, and the space between the case 3 and the housing 1 and between the shaft holes 1b, 3a and the movable shaft 2 is also liquid-tight by known sealing means. is held in

Square hole 2a penetrated through the center of the movable shaft 2
A square shaft 4 that fits the square shaft 4 is fitted into the square shaft 4, and a square head 4a protrudes upward from the square hole 2a of the square shaft 4.
A square hole 5a of the arm 5 to which an external rotational force acts is fitted into the square hole 5a of the arm 5, and a locking screw 6 is bored in the end face of the square head 4a to prevent the arm 5 from coming off. It is screwed into a screw hole (not shown).

In this way, the housing 1 closed by the case 3 accommodates a viscous fluid A such as a polymeric viscous material such as polyisobutylene, pitch or high viscosity water glass, and the viscous fluid A. A indicates the required number of sheets, that is, 3 in the illustrated example.
The movable disks 7, 7', 7'' and the two fixed disks 8, 8' as fixed bodies are arranged alternately in the vertical direction as follows.

That is, at a location of the movable shaft 2 located inside the housing 1, four engaging recesses 2b, 2b, . On the other hand, a shaft hole 7a is opened at the center of each of the movable disks 7, 7', 7'' with an inner diameter that allows the movable shaft 2 to fit therein, and the inner circumference of the shaft hole 7a is From there are four engaging claws 7b, 7b...
... are provided protruding toward the center at positions equidistant in the circumferential direction corresponding to the above-mentioned engagement recesses 2b, 2b..., and the engagement claws 7b... are provided in the above-mentioned engagement recesses. 2b..., so that when the movable shaft 2 rotates, the respective movable disks 7, 7', 7'' also rotate simultaneously.

In the illustrated example, three movable disks 7, 7',
7'', two of them 7 and 7' have the same shape, and the remaining one 7'' has a different shape from the two 7 and 7'.

That is, the movable disk 7'' is thicker than the other movable disks 7, 7', so its circumferential surface is wider than the other movable disks 7, 7'.

All of these movable disks 7, 7', 7'' may have irregular shapes, and in this case as well, there will be one movable disk with the largest plate thickness.

Next, each fixed disk 8, 8' which is a fixed body is
A shaft hole 8a is formed in the center with a size that allows the movable shaft 2 to fit therein, and the movable shaft 2 is loosely inserted into each of the shaft holes 8a so that it is not interlocked with the rotation of the movable shaft 2. ing.

Furthermore, four rotation locking protrusions 8b . 1d..., and as a result, the fixed disks 8, 8' do not follow the rotation of the movable shaft 2, and only the fluctuation in the plate thickness direction is free like the movable disks 7, 7', 7''. It has become a 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, in the present invention, the resistance force is not only the viscous shear resistance force due to the viscous fluid but also the viscous shear resistance force due to the viscous fluid. In order to make it possible to include frictional resistance as well as to adjust the resistance force steplessly, the following configuration is provided.

That is, the housing 1 is provided with an adjustment belt 9 whose inner diameter is freely variable.

On the other hand, the case 3 has a recess 3 inside one side thereof.
b is recessed, and as shown in FIGS. 2 and 3, a shaft support 3c communicating with the recess 3b is passed through laterally, fitted into the shaft support 3c, and disposed inside the recess 3b. and the adjustment belt 9
The adjustment screw 10 is capable of tensioning and thereby freely adjusting the inner diameter of the adjustment screw 10 to reduce its inner diameter.
It is constructed so that it can freely rotate around the axis and is prevented from moving in the axial direction.

The adjustment belt 9 may be formed into a belt shape of steel plate, plastic, leather, etc., or may be formed of wire rope or the like.

The illustrated adjustment belt 9 is made by bending a band-shaped steel plate into an annular shape, with both ends 9a and 9b bent outward and parallel to each other with an appropriate tightening allowance. The adjustment screw 10 is inserted into the shaft hole 9b bored at one end 9a so as to be freely rotatable, and the other end 9a is provided with a screw hole 9d, into which the threaded portion 10a of the adjustment screw 10 is screwed. By rotating the adjusting screw 10 in the screwing direction, the other end 9b is aligned along the threaded portion 10a.
As clearly shown in FIG. 3, the adjustment belt 9 moves toward the one end 9a side, thereby tensioning the adjustment belt 9 and reducing its inner diameter.

Further, the illustrated adjustment belt 9 is fitted into the annular groove 1f on the outer periphery of the housing 1, and when the inner diameter of the adjustment belt 9 is changed to be smaller by the adjustment screw 10 as described above. , by tightening the peripheral wall 1c to the housing 1, the housing 1 is deformed and its inner diameter is reduced, so that the inner peripheral surface of the housing 1 and the movable disk 7,
7', 7'' is configured so that the clearance B with the outer circumferential surface changes small, thereby adjusting the viscous shearing resistance force caused by the viscous fluid A. However, the arrangement position of the adjustment belt 9 is different from that in the illustrated example. The resistance force is not limited to this, and the resistance force can be adjusted even if it is arranged inside the housing 1.

Further, as the housing 1 is deformed by the adjustment belt 9, in the illustrated example, the inner circumferential surface of the housing 1 comes into contact with the outer circumferential surfaces of the movable disks 7, 7', 7'', as described above. When the adjustment belt 9 is disposed inside the housing 1, the adjustment belt 9 comes into direct contact with the outer peripheral surface of the movable disk 7.

Further, the adjustment screw 10 is integrally provided with a flange 10b near its base end, and by bringing the flange 10b into contact with the inside of the shaft bearing portion 3c, the adjustment screw 10 is prevented from coming off due to movement. ing.

Furthermore, it is also possible to use a worm gear for the adjustment screw 10, and in this case, the worm gear and the other end 9b of the adjustment belt 9 will mesh with each other.

In addition, the illustrated example includes three movable disks 7, 7',
7'' and two fixed disks 8 and 8', but it is also possible to use a plurality of movable disks 7... and fixed disks 8... as required. If only one disk 7 is used and the fixed disk 8 is not used, the inner surface of the housing 1 will serve as a fixed body in the same way as the fixed disk 8.

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 the movable disk 7... together with the movable shaft 2 rotates. Since it rotates, viscous shear resistance acts, but the housing 1
When the clearance B between the inner periphery of the movable disk 7 and the outer periphery of the movable disk 7 is at its maximum as shown in FIG. 2, the viscous shear resistance force is small.

When the housing 1 is deformed so that its inner diameter becomes smaller by rotating the adjustment screw 10 and reducing the inner diameter of the adjustment belt 9, the clearance B changes smaller and the viscous shearing resistance increases.

Furthermore, by rotating the adjustment screw 10 and decreasing the inner diameter of the adjustment belt 9, the inner diameter of the housing 1 will also become smaller.
As it becomes smaller and comes into contact with the outer circumferential surface of the movable disk 7, the clearance B becomes almost 0, and a frictional force is generated between the two, so the frictional force is added to the viscous shearing resistance force, and the resistance force is increased. is maximum.

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

<<Effects of the Invention>> The multi-plate damper according to the present invention reduces the clearance between the inner circumferential surface of the housing and the outer circumferential surface of each movable disk by contracting the diameter of the adjusting belt using the adjusting screw and narrowing the inner diameter of the housing. can be made smaller, and furthermore, these inner and outer circumferential surfaces can be brought into contact with each other.

Therefore, the adjustment element not only adjusts the viscous shear resistance of the viscous fluid interposed between each movable disk plate surface and each fixed disk plate surface, but also the viscous shear resistance of the viscous fluid interposed in the variable changing clearance. Furthermore, the contact friction resistance between the inner circumferential surface of the housing and the outer circumferential surface of each movable disk can also be utilized as an adjustment element.

As a result, compared to a conventional damper having only viscous shear resistance force, a larger resistance force can be obtained with the same volume, and the resistance force required for this type of damper can be adjusted widely and steplessly.

In particular, since one of the movable disks has a wider outer circumferential surface than the others, sufficient contact friction resistance between the inner circumferential surface of the housing and the outer circumferential surface of the movable disk can be ensured by the wide outer circumferential surface of the disk. .

[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.
FIG. 3 is a cross-sectional plan view of the same embodiment when no adjustment is made and when adjustment is made, and FIG. 4 is an exploded perspective view of the same embodiment.
5A and 5B are a longitudinal sectional front view and a cross-sectional plan view, respectively, showing a conventional multi-plate damper using viscous fluid, and FIG. 6 is a longitudinal sectional front view showing another conventional multi-plate damper. 1... Housing, 2... Movable shaft, 3... Case, 7, 7', 7''... Movable disk, 8, 8'...
...Fixed disk, 9...Adjustment belt, 10...Adjustment screw, A...Viscous fluid, B...Clearance.

Claims (1)

[Claims] 1 A movable shaft that rotates in response to external force in a housing sealed with a case, and a plurality of movable shafts that are fitted around the outer periphery of the movable shaft to restrict movement in the rotational direction and are free to move in the axial direction. a movable disk,
A plurality of fixed disks are engaged with the inner circumferential surface of the housing to restrict movement in the rotational direction and are free to move in the axial direction. In a damper in which the movable disks and the fixed disks are arranged alternately along the same direction and the viscous fluid filled in the housing is interposed between the movable disks and the fixed disks, one of the movable disks has a wider outer peripheral surface than the other movable disks. A clearance is provided between the outer peripheral surface of each movable disk and the inner peripheral surface of the housing to adjust the distance therebetween, and an adjustment belt is wound around the outer periphery of the housing, and A multi-plate damper using viscous fluid, characterized in that the adjustment belt is provided with an adjustment screw for expanding and contracting the adjustment belt in the radial direction.