JPH01320338A - Variable damping force multi-cylinder rotary damper using viscous fluid - Google Patents

Abstract

PURPOSE:To easily and promptly adjust damping force by enabling an axial cylinder to adjust its diameter by a transmitting mechanism able to be controlled from the outside. CONSTITUTION:An axial cylinder 8 is constituted of an adjusting shaft 8a, pair of arms 8b, 8b and a pair of half-split cylinders 8c, 8c. When an adjusting knob 9b is turned by the desired amount of rotation, the adjusting shaft 8a rotates causing the arms 8b, 8b to be also turned, and the axial cylinder 8 enables its diameter to be decreased by placing the half-split cylinders 8c, 8c to an axial center side while to be increased by separating the half-split cylinders 8c, 8c from the axial center side. Accordingly, damping force can be adjusted to the required preset value.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention comprises a plurality of fixed cylinders and a rotating cylinder arranged coaxially in a fitted state within a casing, and a plurality of polyisobutylene provided within the casing. Polymer viscous fluid such as
By being present between the two cylinders, when the rotating cylinder is rotated, a resistance force is obtained by utilizing the viscous shear resistance of the viscous fluid, and this resistance force acts as a buffer against external force, that is, a braking force. The present invention relates to a multi-tube rotary damper with variable braking force that can be used for various purposes.

(Prior Art) As is known, many conventional dampers have been used that use oil and utilize the turbulent flow resistance when the oil passes through a narrow gap.

However, when using this shock absorber, high precision is required for the above-mentioned gap in order to obtain braking with a predetermined resistance force, and when subjected to an impactful external force, the oil is compressed. Since this is not possible, the impact of the external force will be applied to each member.

As a result, high strength is required, resulting in a large size, and there is also a risk that the clearance may be blocked by dirt.

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

The dampers of the above type include a multi-plate damper using a disk-shaped movable plate and a fixed plate, and a multi-tube rotary damper in which a plurality of fixed cylinders and rotating cylinders are fitted alternately. is known, but the latter has already been proposed (Japanese Unexamined Patent Publication No. 127977/1983).
The configuration is as shown in the figure.

That is, the cylindrical casing a has a fixed outer periphery cylinder C! from its bottom plate. A fixed inner cylinder c coaxial with
2 is erected, and is located on the upper Md of this casing d, and a rotary shaft e is rotatably mounted in the center of the casing d. a movable outer cylinder gl projecting downward from the plate f;
The movable inner cylinder g2 is fitted coaxially between the fixed outer cylinder c1 and the fixed inner cylinder C2 and inside the fixed inner cylinder c2, and in this case, the entire cylinder CI
, 02. The distances between gt and g2 are adjusted to be the same, and the viscous fluid A is filled in the casing d.

Therefore, when using the above damper, by applying an external force as the rotational force F to the rotatable shaft e, both the movable cylinders gl1g2 which are attached to the rotatable shaft e and the fixed cylinders C1 and C2 fixed to the casing a If these are caused to move relative to each other, the viscous shearing resistance caused by the viscous fluid between the two plates will be utilized to exert a buffering effect against the external force. C2, gl
, g2 are all fixed in place, so the distance between the two plates must be aligned with high precision and uniformly.
The viscous shear resistance due to viscous fluid increases as the distance between the cylinders decreases, so if there is a narrow point in the above distance, a large resistance force will be borne between the two cylinders at that point. As a result, excessive force is applied to the member, leading to damage.

As a result, not only is considerable precision required for manufacturing, but as is known, viscous shear resistance is proportional to the facing area of the drawing board, but by changing this facing area, the resistance force can be adjusted separately. Even if a set value is desired, the position of both plates is fixed, so the requirement cannot be met unless a completely new damper is manufactured.

(Problems to be Solved by the Invention) - The present invention was studied in view of the above-mentioned conventional defects, and its first purpose is to rotate a movable shaft by an external force so that this rotational force is transmitted to a movable cylinder. The movable cylinder rotates, but the movable cylinder is allowed to move freely in the radial direction of the rotating shaft, and the fixed cylinder is prevented from rotating even when the movable shaft rotates, and the fixed cylinder is also movable. By configuring the shaft to be able to move freely in the radial direction, the fixed cylinder and movable cylinder, which can move completely freely, are placed in a viscous fluid and the centering effect, that is, the viscous fluid has a large viscous shear resistance. By flowing toward the point where it is, it is possible to take advantage of the fact that the separation distance is evenly divided, and this allows abnormal viscous resistance to be generated locally without requiring high precision in manufacturing. , when you want to eliminate damage to the part and change the resistance,
By removing or adding a fixed cylinder and a movable cylinder, the aim is to make it possible to meet various demands as an instant damper.

A second object of the present invention is to provide a damper as described above, in which the viscous shear resistance due to the viscous liquid can be adjusted;
In order to be able to adjust the braking force to a desired set value, the fixed cylinder and movable cylinder are formed so that their diameters can be expanded and contracted, and the thickness of the shaft cylinder provided at the axial center position of the cylinder is adjusted externally. This allows the inner diameter of the casing in which these cylinder groups can exist to be varied, and by expanding and contracting the diameter of the cylinder groups, the distance between the cylinders can be narrowed. To enable the braking force to be easily and quickly adjusted by increasing the power and conversely increasing the width to reduce the braking force.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes, in the casing,
A required number of movable cylinders whose diameters can be expanded and contracted to be rotated together with a movable shaft that is freely rotatable by an external force, and a required number of movable cylinders that are coaxial with the movable cylinders and arranged alternately, and that are not interlocked with the rotation of the movable shaft. A fixed cylinder whose diameter can be expanded and contracted is disposed in a fitted state, and the viscous fluid in the casing is distributed between the opposing surfaces of the movable cylinder and the fixed cylinder. is immovable in the rotation of the movable shaft due to engagement with the casing, but is movable in the radial direction of the fixed cylinder, and the movable cylinder is also movable in the radial direction, A braking force adjustment device is provided in the casing at the axial center position of the movable cylinder and the fixed cylinder, and allows the diameter of the shaft cylinder to be adjusted by a transmission mechanism that can be operated from the outside. The present invention aims to provide a multi-tube rotary damper that uses viscous fluid and is capable of variable braking force.

(Function) In the present invention, by applying an external force to the movable shaft as a rotational force, the movable cylinder engaged with the movable shaft is rotated within the viscous fluid of the casing. A viscous shearing resistance force is generated between the viscous fluid and the stationary cylinder, which acts as a resistance against external force and acts as a damper. However, the above-mentioned centering effect , the viscous fluid flows toward the location where the viscous shear resistance is large, so even if there was a wide or narrow gap between the movable cylinder and the fixed cylinder, the narrow gap where the viscous shear resistance is large The viscous fluid flows in, causing the movable cylinder and fixed cylinder, both of which have degrees of freedom in the radial direction, to move, resulting in the metal plates being placed within the casing in a concentric arrangement, resulting in locally unreasonable pressure. This will eliminate problems such as damage to members due to resistance.

Furthermore, in the present invention, if the transmission mechanism of the braking force adjustment device is operated from the outside, the shaft cylinder located at the shaft center position within the casing can be moved.
Since it becomes thicker or thinner, when it is made thicker, the movable cylinder and fixed cylinder become enlarged in diameter, and the distance between the cylinder groups becomes smaller, so the braking force increases. If this happens, both cylinders will be in a diameter-reduced state and the separation distance will become larger, thereby reducing the braking force. Therefore, by adjusting the diameter of the shaft cylinder, the braking force can be adjusted to the required setting value.

(Example) The present invention will be described in detail with reference to the embodiments shown in FIGS. 1 to 12. A vessel-shaped casing l is composed of a cylindrical body 1a and a lid body 1b screwed onto the opening thereof. There is.

Next, directly below the lid tb is a disk-shaped flange 2a of the movable shaft 2, which is a cylindrical vessel! d, so that the shaft rods 2b, which are installed inside the casing 1 and protrude perpendicularly from the axis of the flange 2a, can rotate freely in the shaft bearing holes 1c of the lid body 1b. After fitting the square hole 3a of the rotating arm 3 into the square head 2C protruding from the shaft socket IC of the shaft 2b, insert the retaining screw 4 into the connecting dovetail of the square head 2C. By screwing into the hole 2d, the movable shaft 2 can be rotated by the rotational force applied to the rotating arm 3.

Furthermore, a required number of movable cylinders 5a are provided in the casing 1.
, 5b, and fixed cylinders 8a and 8b are located on the outer peripheral side of the axis of the movable shaft 2 and are fitted in an alternate arrangement, and in the illustrated example, the fixed cylinders 6a and 8b of smaller diameter are sequentially inserted from the axis of the movable shaft 2. , a small diameter movable cylinder 5a, a large diameter fixed cylinder 8b, and a large diameter movable cylinder 5b are fitted.

Here, in the present invention, rotational force is transmitted to the movable cylinders 5a, 5b by rotation of the movable shaft 2, and the cylinders 5a,
5b has a degree of freedom in the radial direction of the casing l, a sliding groove 28 is provided on the lower surface of the flange 2a of the movable shaft 2 at a diametric position thereof. A pair of locking pieces 5c and 5d protruding from the upper edges of the cylinders 5a and 5b are slidably engaged with each other.

On the other hand, the fixed cylinders 8a and 8b do not rotate with the rotation of the movable shaft 2, and the casing 1
In order to allow free movement in the radial direction of the movable cylinders 5a, 5b, the fixed cylinders 8a,
A pair of locking pieces 8c and 8d are provided protruding from the lower end edge of the cylindrical body 1a, and are engaged so as to be slidable in a slide groove 1e provided in a straight line position on the bottom wall 1d of the cylindrical body 1a. This slide groove 1e and the slide groove 2e are arranged parallel to each other as shown in FIG. 1, thereby forming a movable cylinder 5a.

5b, fixed cylinders 8a and 8b are both movable in the same radial direction, and the casing 1 is filled with the above-mentioned viscous fluid A.

Here, movable cylinders 5a, 5b, fixed cylinders 8a, 8
As shown in FIG. 3, FIG. 5, FIG. 7, FIG. 9, and FIG. S
4 are cut in a straight line parallel to the axis, and the separation slits Sl, S2 .
Furthermore, the separation slits S3 of the fixed cylinders 6a and 8b. S4
They are separated from each other so that they are on one diameter line and are spaced apart from each other.

This separation slit Ss, S2. S3 and S4 are for enabling the movable cylinders 5a, 5b and the fixed cylinders 8a, 8b to be deformed into an enlarged or reduced diameter state, and also to improve the flowability of the viscous fluid A within the casing l, and to This is also effective for providing even more responsiveness and smoothness due to the alignment effect produced by the rotation of the movable shaft 2.

In addition, in the above-mentioned embodiment, locking pieces 5 are provided on each of the movable cylinders 5a, 5b and the fixed cylinders Ba, 8b.
c.

5d, 8c, 8d are protruded and fitted into the slide grooves 2e, le, respectively, but of course, the male-female relationship can be reversed to form a cylindrical container 1, for example, as shown in Fig. 12Ce). A slide protrusion 1f is provided at a diametrical position protruding from the bottom wall 1d of the body 1a, and a locking groove 8e provided at the lower end edge of the fixed cylinders 8a, 8b at a diametrical position is connected to the slide protrusion 1f. If, it may be fitted so as to be slidable, and a plurality of sliding protrusions 1e and locking grooves 88 may be provided as shown in FIG. 2(b).

Furthermore, in the present invention, a shaft cylinder 8 of the braking force adjustment device 7 is disposed within the casing 1 at its axial center position, and the shaft cylinder 8 is controlled by a transmission mechanism 9 that can be operated from the outside. This allows the diameter to be adjusted.

Here, the first embodiment shown clearly in FIGS. 1 and 3,
In the second embodiment according to FIGS. 4 and 5, the braking force adjusting device is constituted by a link mechanism and a cam mechanism, respectively.

That is, in the first embodiment, the shaft tube 8 has an adjustment shaft 8a, a pair of arms 8b, 8b, and a pair of half tubes 8c, 8c.
A shaft rod portion 8e that is continuous with a protruding flange portion 8d located at the lower end of the Y4 joint shaft 8a is opened in the bottom wall 1d of the cylindrical portion 1a. It is rotatably fitted into the axial center hole 1g, and
A stratified horn head 8f continuous with this shaft portion 8e protrudes from the bottom wall 1d.

The transmission mechanism 9 includes an adjustment knob 3b in which a square hole 9a is fitted into the square head 8f, and a locking screw 9C screwed into the shaft hole 8g to fix this to the stratified square head 8f. It consists of

Further, from the upper end surface of the adjustment shaft 8a, there is a link rod 8h extending upwardly from the upper end surface of the adjustment shaft 8a.

8h protrudes from the center of the upper end surface of the half tubes 8c, 8c, and the pair of shaft holes sj between the 4-joint rods 8i, 8i and the link rods 8h, 8h;
Arms 8b, 8b with openings 8k are linked to ej, 8, and guide elements 81, 81 protruding from the lower end surfaces of the half tubes 8c, 8c are connected to the locking pieces 6.
It is fitted in the slide groove 1e into which the sliders c and 8d are fitted so as to be movable in the radial direction.

Therefore, when using the above-mentioned braking force adjustment device 7, by rotating the adjustment knob 9b from the outside by a desired amount of rotation, the adjustment shaft 8a rotates, thereby causing the arms 8b, 8 to rotate.
b also rotates to pull the half-split tubes 8c, 8c toward the axis, thereby reducing the diameter of the shaft tube 8;
, 8c can be moved away from the shaft center to increase the diameter of the shaft cylinder 8.

On the other hand, in the braking force adjustment device 7 according to the second embodiment described above, instead of using the arms 8b, 8b, an adjustment shaft is installed in the axial square hole 8p of the cam 8n, which has elongated holes 8m, 8m. A square rod 8q protruding from the upper end surface of 8a at the axial center position is fitted, and a half cylinder 8c is inserted into each of the elongated holes 8■ and 8 holes.
, 8c adjustment rods 8i, 8i are loosely fitted,
In this case as well, the diameter of the shaft tube 8 can be varied by rotating the cam 8n and moving the half tubes 8c and 8c apart or closer to each other by rotating the adjustment knob 9b.

Next, in the third embodiment shown in FIGS. 6 and 7, the braking force adjusting device 7 is equipped with p2!2, and in the fourth embodiment shown in FIGS. Figure and 1st
In the fifth embodiment shown in FIG. 1, the elastic changes of the i-shaped body are utilized.

That is, in the third embodiment, the adjustment shaft 8a is formed with a tapered part 8r that tapers upward from the flange 8d, and the screw punch 8S at the upper end thereof has a tapered piece that tapers downward. 8t is screwed into the chain hole 8[', and on the lower inner surface of the half tube 8c, 8c,
The upper and lower tapered receiving surfaces 8u are each formed to have a diameter that gradually becomes smaller from the end edge toward the deeper part of the cylinder.

8u' is provided, and the above-mentioned taper piece 8t and taper portion 8r are in contact with each of these taper receiving surfaces, respectively.

Therefore, in this device, by rotating the adjustment knob 9b, the adjustment shaft 8a is rotated, and thereby the half tube 8c,
Taper piece 8 held in a non-rotating state by 8c
t is moved up and down by the rotation of the screw punch 8s, and as a result, in the case of a downward movement, the halved tubes 8c and 8c are separated, and the outer diameter of the shaft tube 8 is increased. On the other hand, if the taper piece 8t is raised, the outer diameter becomes smaller.

In the fourth embodiment, a helical tube 8, in which a separately prepared band plate is wound, is fitted onto the adjustment shaft 8a, and locking pieces 8w, 8 protrude from the lower end of the tube 8. (The locking pieces 81, 8! are locked in the sliding groove 1e and also from the upper end are locked in the locking grooves 8z, 8z that are not provided on the left and right sides of the lifting piece 8.) Along with that, half-split tube 8c
The vertical ribs 8c' and 8c'' provided on the inner surface of 8c are also L.
The grooves 8z and 8z are engaged with the arrangement 1, and the adjustment shaft 8a
Rako 8S has 1 piece and 8 pieces! It is configured to be screwed into the shaft dovetail hole 8y'' of the.

Therefore, by rotating the adjustment knob 9b, the adjustment shaft 8a is rotated left and right, and when the lifting piece 8te, which is in the rotated +h position, is lowered, the spiral cylinder 8a is pressed in the axial direction and its warp is Since the diameter increases, the half cylinders 8c and 8c are
slides outward, the diameter of the shaft cylinder 8 becomes thicker, and on the contrary, the lifting piece 8! If it moves upward, the spiral tube 8a returns to its original position and becomes smaller in diameter, and the distance between the half tubes 8c and 8c also becomes smaller.

In the fifth embodiment, the spiral tube 8 used in the fourth embodiment
In the illustrated example, two elastic cylinders made of rubber or the like 8mm' and 8mm are used instead of the lifting piece 8! When the elastic cylinders 8c and 8m are lowered, they are crushed in the axial direction, and the diameter increases due to this, resulting in half cylinders 8c and 8.
The shaft cylinder 8 can be made thicker by separating c, and can be adjusted to a smaller diameter by restoring the elastic cylinder 8 degrees and 8 degrees by interlocking the lifting and lowering pieces.

Therefore, according to the present invention, the diameter of the shaft cylinder 8 can be freely adjusted by operating the transmission mechanism 9, so that the movable cylinders 5a, 5b and the fixed cylinders 6a, 6b are present in the casing 1 that can be operated. The diameter can be freely adjusted, and since the diameter of the cylinder can be expanded and contracted, the diameter can be evenly divided by the alignment effect. By increasing the distance between these cylinder groups,
As a result, the braking force based on the viscous fluid A can be adjusted to a desired value.

Therefore, if this is used in a door checker or the like, when an external force acts on the rotary arm 3 as a rotational force, the rotation of the movable shaft 2 causes the movable cylinders 5a and 5b to also move into the sliding groove 2f provided in the flange 2a. and a movable cylinder 5a,
5b's engagement with the locking pieces 5c, 5d, rotational force is transmitted to the movable cylinders 5a, 5b, and at this time, the locking pieces 6c, 8d of the fixed cylinders 8a, 8b are engaged with the cylindrical body 1a. Since the fixed cylinders 8a, 8b and the rotating movable cylinders 5a, 5b are locked in the sliding groove 1e and are in a non-rotating state, they exist between the cylindrical surfaces adjusted in the above manner. A viscous shearing resistance force determined by the thickness of the viscous fluid A acts, and the above-mentioned alignment effect causes the casing! The 100 cylinders 5a, 5b, 8a, and 8b, all of which have degrees of freedom in the radial direction of will be placed in parallel.

(Effect of the invention) Since the present invention is configured as described above,
Since both the movable cylinder and the fixed cylinder are free to move in the radial direction of the casing, the alignment effect when the movable cylinder is rotated by an external force is exerted in an extremely ideal state yE2, resulting in constant reliability. A multi-cylinder rotary damper that provides a high resistance force, and does not cause damage to parts such as cylinders because a large load is not applied locally, and the internal pressure of the viscous fluid does not increase even when an external force is applied. can be provided at low cost.

Furthermore, when you want to significantly change the design of viscous shear resistance,
Reassemble movable cylinders and fixed cylinders into ones with different dimensions,
Also, just change the number.

The purpose can be achieved very easily without creating a new one.

Moreover, in the present invention, the diameter of the shaft cylinder of the braking force adjusting device can be adjusted by only a simple external operation such as a rotational operation, so that the braking force can be easily and quickly adjusted to a desired braking force.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a first embodiment showing a multi-tubular rotary damper with variable braking force using viscous fluid according to the present invention, and FIG.
The figure is a perspective view of the same as above, Figure 3 is an exploded perspective view of the same as above, Figures 4 and 5, Figures 6 and 7, Figures 8 and 9, Figure 10 and Figure TI are rotations of the same as above, respectively. Each longitudinal sectional front view and exploded perspective view of the second, third, fourth, and fifth embodiments of the damper,
a) and (b) are exploded perspective views showing a fixed cylinder and a cylindrical body according to another embodiment, and FIG. 13 is a longitudinal sectional front view of main parts showing a conventional multi-tubular rotary damper using viscous fluid. 1... Casing 2... Movable shafts 5a, 5b... Movable cylinders 8a, 6b... Fixed cylinder 7... Braking force Adjustment device 8 ...... Shaft cylinder 8 ...... Transmission mechanism A ... Viscous fluid agent Patent attorney Yoshio Saifuji Figure 5

Claims (1)

[Claims] (1) Inside the casing, together with a movable shaft rotatable by an external force, a required number of rotated movable cylinders whose diameters can be expanded and contracted are arranged coaxially with the movable cylinder and alternately, and the movable shaft is rotated. A required number of non-interlocking fixed cylinders whose diameters can be expanded and contracted are disposed in a fitted state, and the viscous fluid within the casing is distributed between the opposing surfaces of the movable cylinder and the fixed cylinder. In the damper, the fixed cylinder is engaged with the casing and is immovable in the rotation of the movable shaft, but is movable in the radial direction of the fixed cylinder, and the movable cylinder is also movable in the radial direction. is movable, and a braking force adjustment device is provided in the casing at the axial center position of the movable cylinder and the fixed cylinder, and can freely adjust the diameter of the shaft cylinder by a transmission mechanism that can be operated from the outside. A multi-tube rotary damper with variable braking force using viscous fluid.