JPH01320340A - Automatically adjustable damping force multi-cylinder rotary damper using viscous fluid - Google Patents

Abstract

PURPOSE:To always obtain predetermined damping power even for a change of temperature of air by using a temperature sensing material of silicon rubber, bimetal, etc. for one or both movable and fixed cylinders. CONSTITUTION:A temperature sensing material W3 of silicon rubber, bimetal, etc. is used as the material for one or both movable cylinders 5a, 5b and fixed cylinders 6a, 6b. By using the temperature sensing material, the movable cylinders 5a, 5b and the fixed cylinders 6a, 6b are deformed so as to increase their volume, when a temperature increases, reversely so as to decrease the above volume when the temperature decreases. When the temperature of air increases, viscosity decreases, but a separating distance between cylinder groups 5a to 6b decreases, and damping power can be held to a fixed value. When the temperature of air decreases, the separating distance of the cylinder groups 5a to 6b reversely increases.

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 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, it controls it. This invention relates to a multi-tube rotary damper that can automatically adjust the braking force and can be used for various purposes to generate power.

(As is known in the prior art and conventional dampers, oil has been widely used to take advantage of 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 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 departure area is blocked by filth. 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 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. 53-127977) having a configuration as shown in FIG.

That is, the cylindrical casing d has an inner fixed cylinder C coaxial with the outer fixed cylinder CI because of its bottom plate.
2 is erected, and is located on the upper ad of this casing d, and a rotary shaft e is rotatably mounted in the center of the casing d. a movable outer cylinder gt 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 cylinders CI, c
2. The distance between gl1g2 is adjusted to be the same size, and the casing a is filled with a viscous fluid.

Therefore, when using the above damper, the rotational force F is applied to the movable axis e.
If the two movable cylinders gtegz, which are fixed to the movable shaft e, and the refixed cylinders C1 and C2, which are fixed to the casing a, are caused to move relative to each other by applying an external force, the viscosity between the two plates will be The viscous shear resistance caused by the fluid is utilized to exert a buffering effect against the external force, but in this case, as mentioned above, all the cylinders C1, 82, g
Since t+gz are both fixed at the predetermined positions,
If the distance between the two plates is not aligned with high precision and uniformly, the viscous shear resistance due to the viscous fluid will increase as the distance between the cylinders becomes smaller, so there will be narrow spots in the above distance. In this case, a large resistance force is applied between the two cylinders at that location, and unreasonable 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. It rotates, but
The movable cylinder is made to be freely movable 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 in the radial direction of the movable shaft. By creating a structure that can freely fluctuate, these fixed cylinders and movable cylinders, which can fluctuate completely, are placed in a viscous fluid and the centering effect, that is, the viscous fluid
By flowing toward the location where the viscous shear resistance is large (where the distance between each cylinder is narrow),
By making use of the fact that the separation distance is evenly divided, this eliminates the need for high precision in manufacturing, and eliminates the possibility of localized abnormal viscous resistance causing damage to the component. However, when it is desired to change the resistance force, the fixed cylinder and movable cylinder can be removed or added, thereby making it possible to respond to various demands as an instant damper.

Furthermore, in the present invention, in the damper having the above configuration, when the temperature rises such as in summer, the viscous resistance of the viscous fluid decreases, resulting in an involuntary weakening of the braking force, and in winter, etc. In order to deal with the problem that when the temperature drops, the viscous resistance of the viscous fluid becomes large and therefore the braking force becomes excessive, the above-mentioned temperature-sensitive material whose volume increases or decreases depending on the temperature change is used. By forming one or both of a movable cylinder and a fixed cylinder, fluctuations in viscous resistance are eliminated by automatic changes in the distance between the movable cylinder and the fixed cylinder, and this also makes it possible to eliminate changes in temperature. The second purpose is to ensure that a predetermined braking force can always be exerted.

(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 is immobile in rotation, the fixed cylinder is movable in the radial direction, and the movable cylinder is also movable in the radial direction, and one or both of the movable cylinder and the fixed cylinder are movable in the radial direction. Automatic braking force mfr1 using viscous fluid, which is characterized by the use of temperature-sensitive materials such as silicone rubber and bimetal, so that the volume can be increased or decreased depending on the rise or fall of temperature.
The present invention aims to provide a possible multi-tube rotary damper.

(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 As the viscous fluid flows toward the location where the viscous shear resistance force is large, it flows into the gap between the movable cylinder and the fixed cylinder.

Even if there is a wide/narrow difference, viscous fluid flows into the narrow gap with large viscous shear resistance, and as a result, the movable cylinder and fixed cylinder, both of which have degrees of freedom in the radial direction, move.
As a result, the metal plates are placed in a concentric arrangement within the casing, and as a result, it is possible to eliminate problems such as damage to members due to excessive resistance being applied locally.

Furthermore, when the viscous resistance of the viscous fluid decreases due to changes in temperature, etc. and the braking force weakens, the volume of one or both of the movable cylinder and the fixed cylinder increases, causing the separation between these groups of cylinders. The distance decreases, and the resulting increase in viscous resistance cancels out the decrease in viscous resistance mentioned above.On the other hand, when viscous resistance is strengthened due to a drop in temperature, etc., the movable cylinder, fixed cylinder Due to the increase in the distance between the cylinder groups based on the volume reduction of one or both of the cylinders, the increase in the viscous resistance is eliminated, thus making it possible to maintain a constant braking force at all times.

(Embodiment) To further describe the present invention in detail with reference to a first embodiment shown in FIGS. 1 to 3, a vessel-shaped casing l consists of a cylindrical body 1a and a lid body 1b screwed onto the opening thereof. It consists of 1 cylindrical vessel body 1
There is a bearing recess 1d in the center position of the bottom wall 1c of the
is provided.

Next, directly below the lid body ib, a disk-shaped flange 2a of the movable shaft 2 is rotatably fitted to the cylindrical body 1a, so that the flange 2a is installed inside the casing 1, and the shaft of the flange 2a The inside part 2b of the shaft rod and the outside part 2c of the shaft rod, which protrude directly from the center in an orifice, are rotatably fitted into the bearing recess 1d and the shaft bearing opening 1e of the lid body 1b, respectively. , a square head 2 protruding 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 electrodeposited 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 provided in the casing 1.
, 5b, fixed cylinders 8a, 8b are loosely fitted in an alternate arrangement on the outer circumferential side of the shaft inside 2b of the shaft 2 in the movable shaft 2; 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 the rotation of the movable shaft 2, and
In order for a and 5b to have a degree of freedom in the radial direction of the casing 1, a sliding groove 2 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 peripheral edges of the movable cylinders 5a and 5b are slidably engaged with the locking pieces 5c and 5d.

On the other hand, the fixed cylinders 8a and 8b 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 Be, 8d are provided protruding from the lower peripheral edge of 8b, and are placed on the bottom wall 1c of the cylindrical body 1a,
It is fitted in a slide groove iF provided at its diametrical position so as to be slidable, and this slide groove 1f and the slide groove 2t are arranged to be parallel as shown in FIG. By this arrangement, the movable cylinders 5a, 5b and the fixed cylinders 8a, 8b are both movable in the same radial direction, and the casing 1 is filled with the above-mentioned viscous fluid A.

In the illustrated movable cylinders 5a and 5b, as shown in FIG. , 5b separation pickpocket 7) St.

S2 are separated so that they are located one diameter apart from each other.

This separation slit 7) 51.32 is the movable cylinder 5a.

5b is designed to be able to freely deform into an expanded or contracted state, and improves the flow of the viscous fluid A within the casing 1, thereby making it possible to respond more quickly due to the alignment effect caused by the rotation of the movable shaft 2. It is also effective for providing flexibility and smoothness.

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

5d, 8c, and 6d are provided protrudingly, and these are fitted into the sliding grooves 2f, If, respectively, but of course, the male and female relationships are reversed, as shown in FIG. 8(a).
For example, from the bottom 11c of the cylindrical body 1a, the sliding protrusion 1g
are provided protrudingly at the diametrical position, and the locking grooves 6e provided at the lower end edges of the fixed cylinders 8a and θb and opposite to the diametrical position are engaged with the sliding protrusions 1g so as to be slidable therein. Alternatively, a plurality of slide protrusions tg and locking grooves 6e may be provided in parallel as shown in FIG. 6(b).

Now, in the present invention, the above-mentioned movable cylinders 5a, 5b,
One or both of the fixed cylinders 8a and 8b is made of a temperature-sensitive material such as silicone rubber or bimetal, and as a result, when the temperature rises, the volume of the movable cylinder and the fixed cylinder increases. When the deformation increases and the temperature decreases,
It is deformed so that the volume decreases.

That is, in the first embodiment shown in FIGS. 1 to 3, a temperature-sensitive material is used for the fixed cylinders 8a and 6b, and therefore the fixed cylinders 8a and 8b are.

In each case, an intervening cylinder W3, which is a temperature-sensitive material whose volume increases or decreases depending on the rise and fall of temperature, such as silicone rubber, is sandwiched between the two inner cylindrical bodies Wt and the outer cylindrical body W2. It is formed.

In this case, the cylindrical bodies Ws and W2 also have the movable cylinder 5a.
, same as 5b, separation slit S3 , S*°, S4
, 34° are arranged vertically, so that the fixed cylinders 8a, 8b are fixed due to changes in the wall thickness of the interposed cylinder W3 due to temperature changes.
In the second embodiment shown in FIGS. 4 and 5, the temperature of the movable cylinders 5a and 5b is changed, contrary to the first embodiment. It is designed to have an element of volume change due to change, and for this reason, the movable cylinders 5a, 5 are made in the same manner as in the previous embodiment.
In each case, an intervening cylinder x3 made of silicone rubber or the like is sandwiched between an inner cylindrical body Xs and an outer cylindrical body x2.

Furthermore, in the third embodiment shown in FIGS. 6 and 7, the intervening cylinder x3 made of silicone rubber is not used.
One or both of the movable cylinders 5a, 5b and the fixed cylinders 8a, 8b are made of bimetal, so that the bimetal itself functions as a temperature-sensitive material.

As a result, when the temperature rises, such as during summer, the viscosity of the viscous fluid A inside the casing l decreases, and as a result, the braking force as a damper decreases.
At this time, the movable cylinder 5a.

Since the volume and wall thickness of one or both of fixed cylinders 5b, 8a and eb become large, the distance between these cylinders becomes small, thereby correcting the damping force of the damper.
The braking force can be kept constant even when the temperature changes.

Also, in winter, if the temperature drops, the casing l
The viscous fluid A inside increases its viscosity and the braking force as a damper increases, but in this case, the movable cylinder 5a,
Since the wall thickness of one or both of the fixed cylinders 5b, θa, and 8b becomes thinner, the distance between the cylinder groups increases, thereby making it possible to maintain the braking force of the damper constant.

Therefore, when the multi-cylinder rotary damper 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 cylinder 5a,
5b also includes a sliding groove 2f provided in the flange 2a, and locking pieces 5c of the movable cylinders 5a and 5b.
5d, rotational force is transmitted to the movable cylinders 5a and 5b, and at this time, the locking pieces 6c and Eld of the fixed cylinders 8a and 8b are inserted into the sliding groove IF of the cylinder body 1a. Because it is locked and in a non-rotating state.

The fixed cylinders 11fa and 8b and the rotating movable cylinder 5
A viscous shearing resistance force based on the viscous fluid A existing between the inner cylinders 5a and 5b acts, and the inner cylinders 5a and 5b each have a degree of freedom in the radial direction of the casing 1 due to the above-mentioned alignment effect. , 8a, and 13b are varied to equalize the distance between the cylinders, and as a result, the inner cylinders are placed in parallel so as to equally divide the diameter within the casing l.

Moreover, according to the present invention, even if there is a temperature change, the volumes of the movable cylinders 5a, 5b and the fixed cylinders 8a, 8b will increase or decrease accordingly, and this will reduce the influence of the viscous resistance change of the viscous fluid on the braking force. Corrected, constant braking force can be obtained throughout the seasons.

(Effect of the invention) Since the present invention is configured as described above,
Both the movable cylinder and the fixed cylinder are free to move in the radial direction of the casing, so when the movable cylinder is rotated by an external force, the alignment effect is exhibited in an extremely ideal state, resulting in a reliable chamber. 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, when you want to significantly change the design of viscous shear resistance,
Reassemble movable cylinders and fixed cylinders into ones with different dimensions,
In addition, by simply changing the number of sheets, the purpose can be achieved very easily without having to manufacture new ones.

Furthermore, according to the present invention, since a temperature sensing element with a one-volume change is used in one or both of the movable cylinder and the fixed cylinder, it is possible to correct undesired fluctuations in braking force due to temperature changes such as air temperature, and always achieve the desired level. braking force can be exerted.

[Brief explanation of the drawing]

FIGS. 1 to 3 are a longitudinal sectional front view, a perspective view, an exploded perspective view, and FIG. and the fifth
The figure shows the second embodiment of the same as above, and FIGS. 6 and 7 show a longitudinal sectional front view and an exploded perspective view of the third embodiment of the same as above, respectively, and FIGS. 8(a) (b)
9 is an exploded perspective view showing a fixed cylinder and a cylindrical body according to another embodiment, and FIG. 9 is a longitudinal sectional front view of main parts showing a conventional multi-tube rotary damper using viscous fluid. l...Casing 2...Movable shafts 5a, 5b...Movable cylinder X! ...Inner cylindrical body x2...Outer cylindrical body x3...Interposed cylinders 8a and 8b as temperature-sensitive materials
... Fixed cylinder Wl ... Inner cylinder W2 ... Outer cylinder W3 ... Interposed cylinder A as a temperature-sensitive material ...
...Viscous Fluid Agent Patent Attorney Yoshio Saito Figure 1 Figure 3m 1115 Figure 4 Figure 7" BM

Claims (2)

[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. , Automatic braking force adjustment using viscous fluid, characterized in that temperature-sensitive materials such as silicone rubber or bimetal are used for one or both of the fixed cylinders, so that the volume can be increased or decreased depending on the rise or fall of temperature. Each cylindrical rotary damper possible. (2) A claim in which one or both of the movable cylinder and the fixed cylinder is formed by a pair of large and small cylinders having separation slits, and an interposed cylinder made of silicone rubber sandwiched between the two cylinders. (1) Each cylindrical rotary damper capable of automatically adjusting braking force using the viscous fluid described above.