JPH01320337A - Multi-cylinder rotary damper using viscous fluid - Google Patents

Abstract

PURPOSE:To improve the responsibility and the smoothness of an aligning effect by fitting with a play both side peripheral end edges of movable and fixed cylinders to each groove streak of concentric peripheral grooves respectively formed in a movable shaft and a casing. CONSTITUTION:Concentric peripheral grooves 2h, 1h are respectively provided in the reverse surface side in a flange 2a of a movable shaft 2 and the obverse side in a bottom wall 1c of a cylinder device unit 1a. And movable cylinders 5a, 5b and fixed cylinders 6a, 6b respectively fit with a play each upper side peripheral end edge 5a', 5b', 6a', 6b' to each peripheral groove 2i in the concentric peripheral groove 2h and each bottom side peripheral end edge 5a'', 5b'', 6a'', 6b'' to each peripheral groove 1i in the concentric peripheral groove 1h. These cylinder groups 5a to 6b can be changed moving in the diametric direction of a casing 1 by a width length of these peripheral grooves 2i, 1i, but the cylinder group, even when it is placed in an adjacent condition, holds a separating distance by the thickness of circular arc protrusive streaks 2j, 1j forming the peripheral grooves 2i, 1i.

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
When the cylinder is rotated once by being present between the two cylinders, 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 that can be used for various purposes.

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

However, when using this shock absorber, high precision is required for the oil gap described above in order to obtain braking with a predetermined resistance force, and when subjected to an impactful external force, the oil is compressed. Because it is impossible to do so, the impact of the same external force is applied to each member, and as a result, high strength is required, which has the disadvantage of increasing the size.Furthermore, there is a problem that the permeation gap is blocked by dirt. There is also 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 placed between two adjacent surfaces of two objects that are moving relative to each other, and the A shock absorber that utilizes the viscous shear resistance of viscous fluid to obtain resistance to external force without generating 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. 53-127977) having a configuration as shown in FIG.

In other words, the cylindrical casing a has an inner fixed cylinder C2 coaxial with the outer fixed cylinder CI erected from its bottom plate, and is located above the casing a and has a rotating shaft at its center. e is rotatably mounted on a shaft, and a movable outer cylinder g1 is fixedly attached to the movable shaft e and protrudes downward from a rotating disc f inside the casing a;
The movable inner cylinder g2 is fitted coaxially between the fixed outer cylinder CI and the fixed inner cylinder C2 and inside the fixed inner cylinder C2, and in this case, the entire cylinder Cs
The distances between + C2 and g' + g2 are adjusted so that they all have the same dimensions, and the viscous fluid A is filled in the casing a.

Therefore, when using the above damper, the rotational force F is applied to the rotatable shaft e.
By applying an external force as.

Both movable cylinders g ” + g which are attached to the rotatable shaft e
2 and the refixing cylinders ct and cz fixed to the casing a are moved relative to each other, the viscous shear resistance caused by the viscous fluid between the two plates is utilized, and a buffering effect against the external force can be exerted. However, at this time, as mentioned above, all the cylinders CI, C2, and g' + g2 are fixed in their predetermined positions, so the distance between the two plates must be aligned uniformly with high precision. Otherwise, the viscous shear resistance due to the viscous fluid increases as the distance between the cylinders decreases, so if there is a narrow point in the above distance, the resistance force between the two cylinders at that point will be a large burden. 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 two plates, but by changing this facing area, the resistance force can be adjusted separately. Even if it is desired to set the damper to the set value, since the positions of both plates are fixed, the requirement cannot be met unless a completely new damper is manufactured.

(Problems to be Solved by the Invention) The present invention has been 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 the distance between the cylinders becomes narrower (the point where the distance between the cylinders becomes narrower), it is possible to take advantage of the fact that the distance between the cylinders is evenly divided.
As a result, abnormal viscous resistance is locally generated and damage to the part is caused without requiring high precision in manufacturing.
If you want to eliminate the issue of lighting and change the resistance, you can remove or add a fixed cylinder or a movable cylinder to make it possible to respond to various requests as an instant damper.

Furthermore, a second object of the present invention is the movable cylinder.

Rather than allowing the fixed cylinder to move freely in the radial direction of the casing, the fixed cylinder is configured to hold both concave portions in a state of fitting into the concentric circumferential groove, thereby achieving the above-mentioned freedom within the range of the desired length. This prevents the movable cylinder and the fixed cylinder group from being too close to each other.
Thereby, the instant alignment effect can be started smoothly when the movable shaft is rotated.

(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 that are rotated once together with a movable shaft that is freely rotatable by an external force, and a required number of fixed cylinders that are coaxial with the movable cylinders and arranged alternately and are not interlocked with the rotation of the movable shaft. In the damper, which is disposed in a fitted state and in which the viscous fluid in the casing is distributed between the opposing surfaces of the movable cylinder and the fixed cylinder, the fixed cylinder engages with the casing to cause the movable Although the shaft remains stationary in rotation, it is movable in the radial direction of the fixed cylinder, and the movable cylinder is also movable in the radial direction, and both peripheral ends of the movable cylinder and the fixed cylinder are movable in the radial direction. An object of the present invention is to provide a multi-tubular rotary damper using a viscous fluid, whose edges are loosely fitted into each groove of a concentric circumferential groove formed directly or indirectly on a movable shaft and a casing, respectively. It is something to do.

(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, since the movable cylinder and the fixed cylinder are loosely fitted into each groove of the concentric circumferential groove, these adjacent cylinders do not move to the extent that they come into contact with each other. Since a viscous fluid is always present between the grooves and the groove has a degree of freedom due to its medium length, the alignment effect due to the rotation of the movable shaft can be achieved with good responsiveness and smoothness. Become.

(Embodiment) The present invention will be described in detail with reference to the embodiments shown in FIGS. 1 to 6. A vessel-shaped casing! is the same cylinder body! It consists of a and a lid 1b screwed onto its opening, making it a single cylindrical vessel! A bearing recess 1d is provided at the center of the bottom wall 1c of the housing 1c.

Next, directly below the lid body 1b, a disc-shaped flange 2a of the movable shaft 2 is rotatably fitted to the cylindrical body 1a, so that the flange 2a is housed inside the casing l, and the shaft of the flange 2a The inner shaft 2b and the outer shaft 2c, which project perpendicularly from the center of the shaft, are located in the bearing recesses 1d and M, respectively.
Body lb shaft socket! A square head 2 is rotatably fitted to each of the shafts e, and protrudes from the shaft bearing port 1e of the shaft outside 2c.
After fitting the square hole 3a of the rotating arm 3 into the square hole 3a of the rotating arm 3, the locking screw 4 is screwed into the connecting dovetail hole 2e of the square head 2d. The movable shaft 2 is configured to be rotatable.

Furthermore, a required number of movable cylinders 5a are contained within the casing l.
, 5b, fixed cylinders 8a, 8b are loosely fitted in an alternate arrangement on the outer circumferential side of the shaft rod inside 2b of the movable shaft 2, but in the illustrated example, fixed cylinders 8a, 8b of small diameter are sequentially fitted from the shaft rod inside 2b side. A cylinder 8a, a small diameter movable cylinder 5a, a large diameter fixed cylinder 6b, and a large diameter movable cylinder 5b are fitted.

Here, in the present invention, rotational force is transmitted to the movable cylinders 5a and 5b by rotation of the movable shaft 2, and
, 5b have a degree of freedom in the radial direction of the casing l, the flange 2a on the movable shaft 2
A sliding groove 2f is provided on the lower surface of the slide groove 2f at its diametrical position, and a pair of locking pieces 5c protrude from the upper peripheral edges 5a', 5b' of the movable cylinders 5a, 5b.
5d is fitted so that it can slide freely.

On the other hand, the fixed cylinders 6a and 6b do not rotate with the rotation of the movable shaft 2, and the casing l
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 peripheral edges 6a" and eb" of the cylindrical body 1a, and are inserted into a sliding recess provided at a diameter position of the bottom wall 1c of the cylindrical body 1a. It is slidably engaged in the groove If, and this slide groove U and the slide groove 2f are arranged parallel to each other as shown in FIG.

The movable cylinders 5a, 5b and the fixed cylinders ea, 13b are both movable in the same radial direction, and the viscous fluid A described above is filled in the casing l.

The illustrated movable cylinders 5a, 5b, fixed cylinder 8a,
8b, as shown in FIGS. 3 and 5, one separation slit S1, S2. S3 and S4 are cut in a straight line parallel to the axis, and the movable cylinder 5a
, 5b separation slits St, Sz, and fixed cylinder 8
Separated three of a and 8b 7) S3 and S4 respectively.

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 intended to improve the flow of the viscous fluid A within the casing 1, thereby providing more responsiveness and smoothness due to the alignment effect produced by the rotation of the movable shaft 2.

In addition, in the above embodiment, locking pieces 5 are provided on each of the movable cylinders 5a, 5b and the fixed cylinders 8a, 6b.
c.

5d, 6c, and 8d are provided protrudingly, and these are fitted into the sliding grooves 2f and IF, respectively, but of course, the male and female relationships can be reversed to form 1, for example, a cylindrical shape as shown in FIG. A slide protrusion 1g is provided at a diametrical position protruding from the bottom wall 1c of the container 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 1g. It may be fitted to the strip tg so that it can slide freely, and this sliding protrusion! g. A plurality of locking grooves 8e may be provided side by side as shown in the same figure (tl).

Further, in the present invention, the movable cylinders 5a, 5b and the fixed cylinders 8a, 6b are connected to respective locking pieces 5c, 5d.
, 8c, 8d, with the degree of freedom in the radial direction,
In addition to being fitted in the respective sliding grooves 2f and 1f, in the embodiment shown in FIG. 3, as can be understood from FIG. Concentric circumferential grooves 2h and lh are provided on the surface side of the bottom wall 1c of the cylindrical body 1a, respectively.

A plurality of circumferential grooves 2i, li are concentrically formed in this groove.

And movable cylinders 5a, 5b, fixed cylinders 8a, 1
Upper peripheral edge 5a', 5b', Efa', 8 of 3b, respectively.
b' is loosely fitted into each of the circumferential grooves 21 in the above-mentioned concentric circumferential groove 2h, and each lower circumferential edge 5a'', 5b'', 6a'', 6b'' of the above cylinder Groove 1
is in the respective circumferential grooves 1i in the casing l, and thus these cylindrical groups are located within the respective opposing circumferential grooves 21°11 of the concentric circumferential grooves 2h, lh and extend in the radial direction of the casing l. The grooves 2i, li can be varied by the middle length, but any further displacement is prevented, and these cylindrical groups come close to each other. , lj can have a separation distance equal to the thickness.

As shown in the figure, the concentric circumferential grooves 2h and 1h are divided into two by the aforementioned sliding grooves 2f and 1f.

The above shows the case in which the concentric circumferential grooves 2h and lh are provided directly in the movable shaft 2 and the cylindrical body 1a, respectively, but in the embodiments shown in FIGS. Circumferential groove 2h,
lh is separately provided on each disk-shaped spacer 2;
It is engraved in K.

That is, in the spacer 2, lk is arranged directly below the flange 2a of the movable shaft 2 and directly above the bottom wall IC of the cylindrical container 1a, respectively,
Concentric circumferential grooves 2h, lh are carved on the back side and front side of each of the spacers 2k, lk, respectively, and respective shaft holes 21, 21 are opened through which the shaft rod interior 2b of the movable shaft 2 passes. , the aforementioned locking pieces 5c, 5d, 8c
Cut grooves 2m and 1m are provided for engaging the slide grooves 2f and 1m into the slide grooves 2f and If, respectively.

Therefore, according to the present invention, the movable cylinders 5a, 5b and the fixed cylinders 8a, 8b are allowed to freely fluctuate in the radial direction by the intermediate length of the circumferential grooves 2i, li of the concentric circumferential grooves 2h, lh. Therefore, no matter what the conditions are, a situation in which the cylinders mentioned above come into contact with each other and viscous fluid no longer exists between adjacent cylinders does not occur, and as a result, the movable shaft When a rotational force is applied to the rotational force, the above-mentioned alignment effect is exhibited with immediate response, and a smooth braking force against the rotational force is obtained.

(Effect of the invention) Since the present invention is configured as described above,
Since both the movable cylinder and the fixed cylinder can move freely 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, and this result is reliable. This is a multi-cylinder rotary damper that provides a high resistance force and does not apply a large load locally, so there is no problem of breaking the cylinder or other parts, and the internal pressure of the viscous fluid does not increase even when external forces are applied. can be provided at low cost.

Furthermore, even if you want to drastically change the design of the viscous shear resistance, you can simply replace the movable cylinder and fixed cylinder with ones of different dimensions, or change the number of cylinders, without having to manufacture new ones. That purpose can be achieved.

Furthermore, in the present invention, the degree of freedom of movement of the movable cylinder and the fixed cylinder in the radial direction is restricted within a required range, so the distance between these cylinder groups becomes excessively small. As a result, the alignment effect has good responsiveness and smoothness, and the damper can have desirable damping characteristics.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of a multi-tubular rotary damper using viscous fluid according to the present invention, FIG. 2 is a perspective view of the same, FIG. 3 is an exploded perspective view of the same, and FIGS. 5 is a longitudinal sectional front view and an exploded perspective view of another embodiment of the same damper, FIGS. 6(a) and 6(b) are exploded perspective views showing a fixed cylinder and a cylindrical body according to another embodiment, and FIG. 7 FIG. 1 is a vertical sectional front view of main parts of a conventional multi-tubular rotary damper using viscous fluid. l...Casing 1h...Concentric circumferential groove 11...Peripheral groove 2...Movable shaft 2h... ...Concentric circular circumferential groove 21 ... ... Circumferential grooves 5a, 5b ... Movable cylinder 5a', 5b' ... Upper circumferential edge 5a'' of movable cylinder,
5b--Lower circumferential edge 8a of movable cylinder, Elb...Fixed cylinder 8a', 8b'...Upper circumferential edge 6a", 6 of fixed cylinder
To b: Lower circumferential edge A of fixed cylinder Viscous fluid agent Patent attorney Yoshio Saito Figure 1 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) Inside the casing, together with a movable shaft rotatable by an external force, a required number of movable cylinders are arranged coaxially with the movable cylinder and alternately, and are not interlocked with the rotation of the movable shaft. In a damper in which a required number of fixed cylinders are disposed in a fitted state, and the viscous fluid in the casing is distributed between the opposing surfaces of these movable cylinders and fixed cylinders, the fixed cylinders are connected to the casing. Due to the engagement of the movable shaft, the movable shaft remains stationary in rotation, but is movable in the radial direction of the fixed cylinder, and the movable cylinder is also movable in the radial direction. A multi-cylinder using viscous fluid, characterized in that both peripheral edges of the fixed cylinder and the fixed cylinder are loosely fitted into respective grooves of concentric circumferential grooves formed directly or indirectly in the movable shaft and the casing, respectively. rotary damper.