JPS63308239A - Multiplate type damper with adjustable braking force employed viscous fluid - Google Patents

Abstract

PURPOSE:To make the rotational braking force of a damper adjustable by changing the pressure applied to the polyisobutylene or the like which is used as the elastic fluid for a rotational multiplate type damper. CONSTITUTION:A rotational multiplate type damper is constituted by placing alternately in the vertical direction through a movable shaft 2 a movable plate 6 which is rotatable together with the movable shaft 2, and a stationary plate 7, which does not follow the rotation, as well as keeping an elastic fluid A of polyisobutylene or the like in a casing 1. A hydraulic pressure adjustment screw 8 to apply pressure to the elastic fluid A is then screwed into the casing 1. If the screw 8 is screwed in, the density of the elastic fluid A becomes high, the elastic shearing resistance between the movable plate 6 and the stationary plate 7 increases and the rotational braking force of the movable shaft 2 becomes strong. If the screw 8 is unscrewed, the rotational braking force of the movable shaft 2 becomes weak.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention uses a polymer viscous fluid such as polyimbutylene or other viscous fluid to obtain a resistance force by utilizing its viscous shear resistance. The present invention relates to a damper that can be used for various purposes and can exert a damping effect against external force, that is, a braking force.

(Prior Art) As is known, many conventional dampers have been used in which oil is used to utilize the turbulent flow resistance when the oil passes through a narrow passageway.

However, when using this shock absorber, high precision is required for the above-mentioned conditions in order to obtain braking with a predetermined resistance force, and when subjected to an impactful external force, the oil becomes incompressible. Therefore, the same external force is applied to each member, and as a result, high strength is required, resulting in a large size.Furthermore, the oil gap is blocked by dirt, which is a problem. There is a possibility that this may occur.

Therefore, in order to eliminate the defects of the conventional damper described above, a viscous fluid with high viscosity is distributed between the two adjacent surfaces of two objects that are moving relative to each other, and the viscous fluid that is generated during the relative movement is A shock absorber that utilizes the viscous shear resistance of a fluid to obtain resistance to external forces without generating an internal pressure increase in the viscous fluid.
It has already been developed.

In the damper using the viscous fluid indicated by L, both the movable plate and the fixed plate are disks, and the relative movement is a rotating multi-plate damper (Utility Model No. 4A-2SGE, Utility Model Number 57-3984).
No. 4), a traction multi-plate damper that uses a movable plate and a fixed plate that have square shapes such as rectangular shapes instead of discs, and that pulls the movable plate in a straight line, and a traction multi-plate damper that uses a movable plate and a fixed plate that have square shapes such as rectangular shapes instead of discs, and a traction multi-plate damper that pulls the movable plate in a straight line. ,
A rotary coaxial cylindrical damper is known (Japanese Utility Model Publication No. 5816/1983), which has a group of rotating coaxial cylinders that mesh with each other to rotate the movable plate.

Although these have the same basic and ultimate principles, for example, as an example of the above-mentioned rotary multi-plate damper, a desired plurality of disc-shaped movable plates are mounted in a casing perpendicularly to the rotating shaft. and a disk-shaped fixed plate fixed to the casing between the movable plates, and the viscous fluid in the casing due to filling is distributed between the plate surfaces of these movable plates and the fixed plate. It is known that this was done.

However, even with a damper that utilizes the viscous fluid on the side, it is necessary to adjust the braking force as a damper in accordance with the magnitude of external force depending on the usage. If you can't and try to achieve this,
By creating a product with a different design from the beginning, changing the size of the casing, the dimensions of the movable plate, and the fixed plate, we can increase the distance between the movable plate and the fixed plate to reduce the resistance force.
On the other hand, there are ways to achieve the objective other than by making it smaller to increase the resistance force, or by increasing the facing area of both plates to increase the resistance force, or by decreasing the opposing area to decrease the resistance force. There was no.

(Problems to be Solved by the Invention) The present invention has been studied in view of the drawbacks of the above-mentioned conventional example, and as described above, the relative positions and sizes of the movable plate and the fixed plate are adjusted, and the movable plate is In consideration of the fact that when the resistance to movement is made variable, immediate fine adjustment is not possible, and it depends on the mounting structure of the movable plate and the fixed plate, making it difficult or impossible to adjust the resistance. Based on a completely new idea of changing the pressure that the viscous fluid itself receives inside the casing, it is possible to change the viscosity extremely easily and quickly by simply rotating the screw rod for any type of viscous damper. The purpose is to change the viscosity of the fluid due to changes in density so that the viscous shear resistance can be changed.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a movable shaft inside a casing that can be freely rotated or pulled by an external force.
A required number of movable plates that are rotated or towed, and a required number of fixed plates that are not interlocked with the rotation or traction of the movable shaft are arranged alternately with these movable plates, and the viscous fluid in the casing is However, in the damper distributed between the surfaces of the movable plate and the fixed plate, the casing has a hydraulic pressure adjusting device that penetrates through the casing and has its tip immersed in viscous fluid and its base end exposed to the outside. It was designed to have a screw rod for use.
An object of the present invention is to provide a multi-plate damper that uses viscous fluid and is capable of adjusting braking force.

(Operation) When an external force is applied to the movable shaft as a rotational force or a linear traction force, the movable plate held or connected to the movable shaft is rotated or pulled within the viscous fluid of the casing. At this time, a viscous shearing resistance force is generated between the movable plate and the fixed plate in a stationary state due to the viscous fluid, and this acts as a resistance against external force, thereby achieving the effect of a damper. Although the physical properties of the viscous fluid mentioned above vary slightly depending on the type, it is compressible unlike oil etc. if pressure is applied to the viscous fluid directly or through a gas such as air. This compression increases the density of the viscous fluid, so by operating the hydraulic pressure adjustment screw according to the present invention from the outside, the viscous fluid inside the casing is compressed and the density increases. By increasing the viscosity, it is possible to increase the viscous shear resistance, or to adjust the damping force of the damper to a smaller value by passing the pipe through.

(Embodiment) The present invention will be described in detail by embodiments using a rotary multi-plate damper as shown in the drawings and a rotary coaxial cylinder group damper. Main body IA
, a bearing recess lb is provided in the bottom wall 1a of the vessel-shaped casing main body IA, and a vertical groove groove 1d is provided at an opposing location on the inner circumferential wall IC.
, ld... are recessed.

Next, the movable shaft 2 is fitted onto the central axis of the casing body IA, and its tip is fitted into the bearing recess 1b, and a flange 2a provided on the upper part of the movable shaft 2 By screwing the lid plate 3 fitted into the upper end female screw portion 1e of the casing l, the square head portion 2c with the connecting field screw hole 2b protruding from the flange portion 2a can be attached to the lid plate 3. It passes through the plate 3, and the casing 1 is constituted by the cover plate 3 and the casing body IA.

The square hole 4d of the rotating arm 4 on which external rotational force acts is fitted into the protruding end of the square head 2c, and the retaining screw 5 is fitted to prevent the arm 4 from being pulled out. It is screwed into the connecting field screw hole 2b.

Now, in the casing body IA closed by the lid plate 3 in this way, a viscous fluid A made of a viscous polymer such as polyisobutylene, pitch or high viscosity water glass is accommodated as described above. In addition, within the viscous housing A, there is a required number of movable plates 6, which are disc-shaped in the illustrated example.
, 6... and the fixing plates 7, 7...
They are arranged in the following manner so that they are arranged alternately in the vertical direction.

That is, the movable plate 6 is a disc having a fitting shaft hole 6a opened at its axis, and the fitting grooves sb, eb... of the shaft hole 6a are open.
. . ., a fitting protrusion 2d vertically provided on the movable shaft 2.

2d... is engaged, the movable plate 6 also rotates with the rotation of the movable shaft 2, but this movable plate 6
is movable in the axial direction, that is, in the thickness direction, with respect to the movable shaft 2, and therefore can be raised and lowered as shown in FIG. 1(a).

Next, the fixing plate 7 has a fitting shaft hole 7a formed at its axis, and closure protrusions 7b, 7b, etc. on the outer peripheral edge.
The movable shaft 2 is loosely inserted into the fitting shaft hole 7a, so that the rotation of the four shafts 2 is caused by the rotation of the fixed plate 7.
and the closing protrusions 7b, 7b.
. . . is the longitudinal fissure groove strip 1 of the casing main body IA.
d, ld......, and thereby the fixing plate 7
The movable plate 6 does not follow the rotational force and can fluctuate in the thickness direction as freely as the movable plate 6, and 3a in the figure indicates the shaft hole of the attached plate 3.

Now, in the present invention, the distal end 8a is immersed in the viscous fluid A through the casing 1, and the proximal end 8a is immersed in the viscous fluid A through the casing 1.
b is provided with a screw rod 8 for adjusting hydraulic pressure exposed to the outside, and in the illustrated example, the screw rod 8 for adjusting hydraulic pressure is screwed into a female screw tube 8c protruding from the peripheral side of the casing body IA. However, of course, the screw position may be on the bottom wall 1a or on the cover plate 3 of the casing l, and 8d in the figure indicates the operating head of the screw rod 8.

Therefore, the above rotary damper is used as a door chain.

When used in a car, etc., when an external force acts on the rotating arm 4 as a rotational force, the rotation of the movable shaft 2 causes the movable plate 6 to
, 6... will rotate, and therefore the movable plates 6, 6... and the non-rotating fixed plates 7, 7...
A viscous shearing resistance force based on the viscous fluid A that exists between each plate surface acts, and the viscous fluid A has a large viscous shearing resistance, that is, a place where the separation distance between the plates is narrow. (Due to the alignment effect, the separation distance is made uniform.) (Based on the phenomenon, both plates have a degree of freedom in the thickness direction.) Both plates move, which makes the gap between the plates uniform. As a result, the drawing plates are placed in a parallel state so as to equally divide the entire free length H of the plates within the casing 1.

Therefore, the above-mentioned hydraulic pressure adjustment screw rod 8 is
d, the tip 8a becomes the female screw tube 8c.
Since the viscous fluid A inside the casing 1 is forced into the casing 1, the viscous fluid A inside the casing 1 is compressed directly or through the air remaining inside the casing 1, and this As a result, the density of the fluid A increases, that is, its viscosity increases, and the viscosity that exists between the movable plates 6, 8... and the fixed plates 7, 7... The viscous shear resistance based on the fluid A increases, and by reversely opening the hydraulic pressure adjustment screw 8, the braking force as a damper can be adjusted to a small value.

Next, to explain the rotary coaxial cylindrical damper shown in FIG.
is engraved thereon, and the cover plate 3 is screwed thereto.In this embodiment, the fixing plates 7.7... are integrally orthogonally formed from the bottom wall 1a of the casing body IA. , is formed by a protruding group of coaxial cylinders, whereas the movable plate 6
, 6 . . . are formed by projecting a group of coaxial cylinders downward from the top plate portion 2e formed integrally with the movable shaft 2 in a direction perpendicular to the fixed plate 7 . 7...
- The movable plates 6.6... are placed in the equal annular gaps 7c, 7c... between the movable plates 6.6, and the equal annular gaps 8c, 8c are placed between the movable plates 6.6... Fixing plate 7 on...
．． By inserting 7..., the two plates are meshed with each other in a non-contact state, with the square head 2C of the movable shaft 2 protruding from the cover plate 3, and the connecting tube The rotating arm 4 is fitted into the square head 2C by the retaining screw 5 which is threaded into the hole 2b.
is fixed as in the previous embodiment, and the above fixing plate ? The middle one in the center is cylindrical.

The hydraulic pressure j1g1 node screw 8 is also screwed into the female screw tube 8C provided on the peripheral side of the casing body IA, and its tip 8a is directed toward the outermost movable plate B, and both 8
．． 6 has a perpendicular arrangement.

Therefore, in this case, when an external force as a rotational force is applied to the rotating arm 4, the movable shaft 2 and the movable plate 8.6...
The stationary plate 7°7... rotates.
A viscous shearing resistance based on the viscous fluid A existing in the gap between the viscous fluid A acts, thereby exerting the desired braking force, and at this time, the viscous fluid A is By changing the density, the braking force can be adjusted freely, which is exactly the same as in the previous implementation.

(Effect of the invention) Since the present invention is constructed as described above, 1
Not only can it be adopted for any rotary multi-plate damper, traction multi-plate damper, or single-rotation coaxial cylinder damper, but it can also be widely applied to any of the three types, no matter how different their configurations may be. Therefore, it has excellent versatility, and the braking force as a damper can be freely adjusted by an extremely simple operation such as operating the pipe opening of the screw rod.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are a longitudinal sectional front view and an exploded perspective view of essential parts showing an embodiment of a rotary multi-plate damper according to the present invention, and FIG. 2fffl is an embodiment in the case of a rotary coaxial cylindrical damper. FIG. 2 is a longitudinal sectional front view and an exploded perspective view of essential parts, respectively. l...Casing 2...Movable shaft 6...Movable plate 7...Fixed plate 8...Screw rod for hydraulic pressure adjustment 8a... ...Tip A...Viscous fluid

Claims (2)

[Claims] (1) Inside the casing, along with a movable shaft that can be freely rotated or pulled by an external force, there are a required number of movable plates that are rotated or towed, and these movable plates are arranged alternately so that they are not interlocked with the rotation or traction of the movable shaft. In the damper, the casing is provided with a required number of fixed plates, and the viscous fluid in the casing is distributed between the surfaces of the movable plate and the fixed plate. A multi-plate damper capable of adjusting braking force using viscous fluid, characterized by having a screw rod for adjusting hydraulic pressure whose tip end is immersed in viscous fluid and whose base end is exposed to the outside. (2) Both the movable plate and the fixed plate are disks, square plates,
A multi-plate damper capable of adjusting braking force using a viscous fluid according to claim 1, which is any one of a group of rotating coaxial cylinders.