JPH02292480A - Damper for flap door using viscous fluid and control method for braking force thereof - Google Patents

Abstract

PURPOSE:To enable a door to be opened and closed smoothly and at a specified speed by a method wherein a moving shaft and a moving member rotatable only in one way are disposed in a case, and the effect of a spring and the effect of a damper are provided. CONSTITUTION:A moving shaft 2 rotatable by a door and the like is disposed in a case 1. A spring one-way clutch 7 is located so that the clutch is engaged and disengaged depending upon the rotation direction of the moving shaft 2, and a moving member 4 is disposed so that it is rotatable only in one way together with the moving shaft 2. Viscous fluid C is located between the case 1 and the moving member 4, and a spring 8 is located in a state that the both end parts thereof are locked to the case 1 and the moving shaft 2. The effect of the spring 8 and a damper effect by the viscous fluid C are provided, a door is smoothly opened and closed, and regulation is effected so that an opening and closing speed is adjusted to a desired specified value.

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention uses a polymeric viscous fluid such as polyisobutyne, other viscous fluid, and a spring, and utilizes the viscous shear resistance and spring force of each of them. When the door rotates in one direction, this resistance force exerts a buffering effect against the door load torque, that is, a braking force, and when the door rotates in the other direction. In some cases, the present invention relates to a damper for a flap door using a viscous fluid configured to allow the door to be slightly rotated by the action of the spring, and a method for controlling the braking force. <<Prior Art>> Conventionally, as a damper using a viscous fluid, as shown in FIG. A required number of movable disks C. c', c... are fixed, and these movable disks C, C', C...
A required number of fixed disks d, d' are arranged alternately with . ,d"・
... are arranged, and these movable disks C, C',
C... and fixed disks d, d', d"・
There are cases in which a viscous fluid e filled in a case a is interposed between the plate surfaces of the
There is also a movable disk that is not fixed to the rotating shaft, but is locked in conjunction with the rotation of the rotating shaft, but is movable in the thickness direction. Therefore, both of the above dampers are , by applying an external force as a rotational force to the rotating shaft b, the movable disks c, c', etc. rotate together with the rotating shaft b, and the fixed disks d, d', . Due to the relative movement with..., both disks c, c'..., d, d'...
...By utilizing the viscous shear resistance caused by the viscous fluid between the two, it is possible to exert a buffering effect against the external force. <<Problems to be Solved by the Invention>> However, in each of the above dampers, even if it is desired to make the resistance force variable in the direction of rotation of the rotating shaft b (forward rotation, reverse rotation), the determining factor of the resistance force is Movable disk c,
c'...... and fixed disks d, d'...
The viscous fluid between the two disks during relative motion with the disk. Since the viscous shear resistance is unchanged, the resistance force, that is, the braking force, cannot be changed depending on the forward or reverse rotation direction of the rotating shaft. Therefore, the shaft torque when opening and closing a flap door, etc., that is, the door load torque curve f, is expressed as a cosine (coS) as shown in Fig. 5.
In this case, even if the rotation axis of each damper is fixed to the door, the opening/closing operation of the door,
In particular, the operation of opening (or closing) the door from the 0° position (door closed horizontally) to the 30'' position (door open erect) becomes extremely heavy.
In addition, if the door opening/closing operation, that is, the braking force, is to be appropriately controlled by the opening/closing direction so that the door closes slowly, an extremely complicated auxiliary mechanism must be used. The present invention has been made in view of the problems of the above-mentioned conventional technology, and in claim (1), the door load torque curve is approximately approximate to the door load torque curve, and the door load torque curve is The spring force is applied at a low position, and the difference between the door load torque curve at that time and the straight line showing the change in spring force is compensated for by the viscous shear resistance force.
This ensures that the door descends at a substantially constant speed no matter what closing angle the door is at.
When opening from 9011 to 80'', the door is opened lightly by spring action, and when closing from 9011 to 0'', it is made gentle by spring action and the action of viscous shearing resistance, so that the door closes smoothly. In addition, it is an attempt to provide a damper for a flap door using viscous fluid that can control the opening/closing operation of the door in a single axis without using a complicated mechanism. ，
In other words, the purpose is to provide a control method that allows braking force to be easily controlled to a desired value. <<Means for Solving the Problems>> In order to achieve the above object, the present invention in claim (1) includes a movable shaft rotatable by a door etc. in the case, and a one-way spring so as to be disconnectable depending on the direction of rotation of the movable shaft. A movable member is arranged so as to be rotated in only one direction together with the movable shaft via a clutch, and the viscous fluid in the case is distributed between the case and the movable member, and a spring is provided in the case. attempts to provide a flap door damper using viscous fluid, characterized in that each end is hooked to the case and the movable shaft. Furthermore, in claim (2), the case. The case and the movable shaft are connected to the movable shaft, which is supported so as to be rotatable when opening and closing M, etc., at a position that is approximately approximate to the door load torque curve when the door is opened and closed, and is lower than the door load torque curve. At the same time, the difference between the above-mentioned door load torque curve and the spring force is applied to the force of a spring disposed by hooking each end to the spring force, and the difference between the above-mentioned door load torque curve and the spring force is applied to a spring force disposed within the above-mentioned case along with a movable shaft, which is disposed rotatably in only one direction. To provide a damper for a flap door using a viscous fluid as described above, and a method for controlling the braking force thereof, characterized in that the shearing resistance force of the viscous fluid disposed between a movable member and a case is used. It is. <<Operation>> When an external force is applied to the movable shaft as a rotational force in one direction, the movable shaft is rotated in one direction, but since the coaxial shaft and the movable member can be disconnected and disconnected via a spring one-way clutch. , When the movable shaft rotates in one direction, the movable member is not rotated and therefore no viscous shear resistance occurs. If the door is moved eight times in the closing direction, the movable shaft will be screwed in the direction in which the spring is wound, so this screwing resistance will act on the movable shaft, and the resulting restoring force of the spring will prevent the door from opening. This will make it easier. On the other hand, as the movable shaft rotates in the opposite direction, the movable shaft and the movable member are connected via the spring one-way clutch, so the movable member rotates together with the movable track, causing viscous shear resistance. Therefore,
The spring and damper effects allow the door to close gently and smoothly. That is. , the door can be closed at a desired constant speed at any angle when opened. Also, around θ° when the door closes, the speed becomes slightly slower, which is the ideal state for movement. Furthermore, by considering springs as having different constants, it is possible to vary the movement when opening and closing the door. <<Example>> Hereinafter, an example of the present invention will be explained with reference to the drawings. As shown in FIGS. 1 and 2, the horizontally cylindrical case 1 has a shaft hole 1b passing through the center of the end wall 1a, and an opening at the other end of the peripheral wall 1c. A female screw portion 1d is carved on the inner periphery of the side. The movable shaft 2 is rotatably penetrated into the shaft hole 1b in a liquid-tight manner, and a cover plate 3 is screwed into the male screw portion 1d of the case l in a liquid-tight manner. A bearing recess 3a is provided in the center of the case 1, and by fitting one end of the movable shaft 2 into this, the movable shaft 2 is made rotatable in the direction around the axis. It is supported on the center line. A rotational center such as a flap door (not shown) is fixed to the protruding end, which is the other end of the movable shaft 2, so that a rotational force as an external force acts. A cylindrical portion 3b is provided from the inner surface of the cover plate 3 in the axial direction and protrudes by a required dimension shorter than the length of the case 1, and the cylindrical portion 3b is located inside the case l.
The movable shaft 2 is located approximately midway between the peripheral wall 1c and the movable shaft 2. Furthermore, the movable shaft 2 has a case! An outward flange 2a is provided inside and inscribed in the end wall 1a,
This prevents the movable shaft 2 from coming out of the case 1. The cylindrical movable member 4 is formed so that its axial length is slightly shorter than the effective length of the case l in the axial direction, and its outer diameter is smaller than the inner diameter of the case l. The inner diameter is larger than the outer diameter of the cylindrical portion 3b, and the movable member 4 is disposed in the case 1 at an approximately intermediate portion between the peripheral wall IC and the cylindrical portion 3b, and at one end thereof. is installed inside the outward facing flange 2a in a rotatable manner. Since the O-ring 5 is interposed between the outer periphery of one end of the movable member 4 and the peripheral wall 1c and end wall 1a of the case 1, the liquid is kept between the one end of the movable member 4 and the end wall la. On the other hand, since the O-ring 6 is also interposed between the movable member 4 and the tip of the cylindrical part 3b, this part is also sealed in a liquid-tight state, so that the case 1 The interior is divided into chamber A at the center and chamber B at the outer periphery. Each of the O-rings 5 and 8 is designed to prevent the movable member 4 from moving or falling off even when the movable member 4 rotates in the circumferential direction, and to maintain the sealing effect of the relevant portion.
Step portions 4a, 4b, 3c, etc. are provided on the outer periphery of one end of the member 4, the inner periphery of the member 4, and the outer periphery of the cylindrical portion 3b, respectively, for fitting. In this way, the cover plate 3 closes the O-rings 5 and 8.
It is divided into two chambers A and H, of which chamber B at the outer periphery inside case 1 contains a viscous polymer material such as polyisobutylene, pitch or high viscosity water glass, etc. Contains fluid C. On the other hand, the spring one-way clutch 7 has a fixed outer diameter by tightly winding a spring steel wire having a rectangular cross section or a circular cross section in the axial direction. It is formed so that it is in close contact with the surrounding surface. The spring one-way clutch 7 is disposed in close contact with the movable member 4, with one end 7a bent in the axial direction being hooked to the outward flange 2a of the movable shaft 2, and the other end being hooked to any member. It is in a free state without being stopped. Therefore, when the movable shaft 2 is rotated in one direction, that is, in the direction of arrow D shown in FIG. The spring one-way clutch 7 is wound and tightened by a, its outer diameter is reduced, and the close contact between the outer circumferential surface and the inner circumferential surface of the movable member 4 is increased by the second
As shown in the figure, the connection between the movable shaft 2 and the movable member 4 is released, and conversely, the movable shaft 2 is rotated in the opposite direction to the above rotation direction, that is, in the opposite direction of the arrow. Its outer diameter is enlarged and it comes into close contact with the inner peripheral surface of the movable member 4, so that the movable member 4 is rotated together with the movable shaft 2. That is, the spring one-way clutch 7 has a function of switching the power transmission between the movable shaft 2 and the movable member 4 to a disconnected or engaged state depending on the direction of rotation of the movable shaft 2. Next, in the illustrated example of the spring 8, which is an important component of the present invention, it is located in the chamber A at the center of the case L, is externally mounted on the movable shaft 2, uses a coil spring, and is movable. It is provided to apply a rotational force to the shaft 2 in one direction, and to apply a resistance force to the same shaft 2 when the movable shaft 2 is rotated in the opposite direction. That is, in the case of the coil spring, one end 8a and the other end 8b, which are curved in the axial direction, are hooked to the cover plate 3 and the outward flange 2a of the movable shaft 2, respectively. Although it is arranged in the case l, when it is arranged, it may be screwed in advance to some extent in the winding direction, and each end 8a, 8b is hooked to the cover plate 3, the outward 7 flange 2a, In this case, a rotational force in one direction is applied to the movable shaft 2 so that the restoring force rotates the movable shaft 2 in one direction, that is, in the direction of arrow D in FIG. Here, if a torsion spring in the form of a rod or the like is to be used instead of a coil spring as the spring 8, the movable shaft can be made hollow and the torsion spring can be installed inside the movable shaft. When the above damper is used for a flat door, etc., the movable shaft 2 is attached to the door, and the case l is fixed to the door mounting member. When the door is installed in the open position at 90° vertically, the two are connected so that the door opens in the direction of rotation of the movable shaft 2 (in the direction of the arrow in the figure). Therefore, when an external force is applied to the door to open the door, the movable shaft 2 is rotated in the direction of arrow D in FIG. 2, and the diameter of the spring one-way clutch 7 is reduced. The connection between the movable member 4 and the movable shaft 3 is cut off.
Since only the movable member 4 is rotated in the direction of the arrow D, the movable member 4 does not rotate, and therefore, naturally, no viscous shearing resistance is applied. Moreover, at this time, the restoring force of the spring 8 is stored in the movable shaft 2 in the direction of rotation, so that the door can be opened with a light force. Also, by moving the door in the closing direction, the movable shaft 2
is rotated in the opposite direction of the arrow, thereby expanding the diameter of the spring one-way clutch 7 and bringing it into close contact with the movable member 4.
Since the movable member 4 is rotated together with the movable shaft 2, viscous shear resistance acts in this case. Also, due to the rotation of the movable shaft 2 in the opposite direction of the arrow, the spring 8
is screwed in the winding direction, and the resistance force due to the screwing acts on the movable shaft 2, and as a result, the door closes slowly and smoothly. Figure 3 shows another embodiment. The case 1 has a bearing recess 3a and a shaft hole 1b in the center of lid plates 3 and 9 which are fitted in a liquid-tight manner at both ends thereof, and a partition wall near one end of the case 1. ! Since e is provided integrally, the inside of the case 1 has a chamber A in the axial direction.
and room B. A solid movable member 4 is fitted into a shaft hole if penetrating through the center of the jade wall 1e, and a shaft support is installed so that the movable member 4 is on the center line of the case l and can freely rotate in the direction around the axis. At the same time, one end of the movable member 4 is rotatably fitted into the bearing recess 3a of the cover plate 3. On the other hand, the movable shaft 2 is inserted into the shaft hole 1b of the cover plate 9, so that it is on the center line of the case l and is supported rotatably in the direction around the axis, and the inner end of the movable shaft 2 is , in the movable member 4, is rotatably fitted into a bearing recess 4c formed in the center of the end face of the other end protruding into the chamber A of the case 1. The movable shaft 2 and the movable member 4 are supported along an axial line that is the center of the case l. The spring one-way clutch 7 is disposed in close contact with the outer periphery of the portion of the movable member 4 that protrudes into the chamber A of the case 1 so that it can be disconnected and disconnected freely, and one end thereof is connected to the movable shaft 2. It is hung. That is, when the movable shaft 2 is rotated in the direction of the arrow D shown in the figure, the spring one-way clutch 7 is expanded in diameter and the movable member is rotated in the opposite direction to the winding direction. 4 is released, the power transmission between the movable shaft 2 and the movable member 4 is cut off, and the movable shaft 2 is rotated in the opposite direction of the arrow, thereby reducing the diameter. Since they are in close contact with each other, they function to rotate together with the movable shaft 2 in the opposite direction of the arrow. One end 8a of the spring 8 was hooked to the cover plate 3 in the previous embodiment, but in this embodiment, it is hooked to the picture wall 1e. In the other chamber B of the case 1, the movable member 4 is suspended in a state perpendicular to the movable member 4 so as to be rotatable together with the movable member 4, which is rotatable only in one direction (the direction opposite to the arrow shown in the figure). A required number of movable disks 10.10°, which are movable in the thickness direction, and these movable disks 1
0.10' and alternate arrangement. A required number of fixed disks 11 are disposed that are not interlocked with the rotation of the movable member reef by engagement with the case l, but are movable in the thickness direction. These movable discs 10.1
A viscous fluid C filled in the chamber B of the case l is interposed between the plate surfaces of the fixed disk 11 and the fixed disk 11. When the member 4 is rotated in the direction opposite to the arrow, the movable disks to, to° and the fixed disk 11 rotate together with the movable member 4.
. . . Both disks 10 when they move relative to each other.
By utilizing the viscous shear resistance caused by the viscous fluid between the movable shaft 2 and the door 10', the movable shaft 2, that is, the door can exert a braking action against the external force. FIG. 4 is a graph showing the braking area for the door load torque curve f in the method of controlling the braking force of the damper in one axis. In this braking force control method, the force of the spring 8 is applied to the movable shaft 2 at a position that is approximately approximate to the door load torque curve f and is lower than the door load torque curve f, thereby controlling the spring. In addition, the difference between the door load torque curve f and the spring force line g at that time is made to obtain the viscous shear resistance control region F, which is affected by the viscous shear resistance. By doing this, 1k can descend from 90° toward 0'' while maintaining a fairly constant speed at any closing angle, and furthermore, when the door is closed near θ° When the legs are closed, the speed becomes slightly slower as shown in Figure 4, which is the ideal state for leg motion. <<Effects of the Invention>> The present invention is constructed as described above. Therefore, the door is in the closed or open position at 06 when the door is in the horizontal position, and the open or closed position is at 80° when it is in the vertical position. By attaching the movable shaft 2 of the damper to the door so that the movable shaft of the damper is rotated in a predetermined direction when the damper is rotated to the position, the spring 8 in which the restoring force is stored is lowered to move the door to 0''. The door can be rotated easily from the 90" position to the 90" position. Also, when the door is tilted from the 80° position to the 06 position, the door is held in place by the resistance of the spring 8 being screwed in its winding direction and the viscous shear resistance. By adopting the method described above to control the damper's braking force, the door can be moved at a desired constant speed at any angle within the range of its opening/closing angle. Not only can opening/closing be ensured, but the speed is slightly decelerated near <.o'', making it possible to control the opening/closing operation of the door in an ideal state. , it can be controlled with an extremely simple single axis.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing an embodiment of a flap door damper using viscous fluid according to the present invention, and Fig. 2 is a longitudinal sectional front view showing the same embodiment with the movable shaft rotated in one direction. Fig. 3 is a longitudinal sectional front view showing another embodiment of the same damper, Fig. 4 is a graph showing the door load torque curve, spring control region and viscous shear resistance control region in the braking force control method, and Fig. 5 Figure 6 is a graph showing the door load torque curve of a flap door, and Figure 6 (a) is a vertical front view and a cross-sectional plan view showing a conventional example of a damper using viscous fluid! be. l...Case 2...Movable shaft 4...Movable member 7...Spring one-way clutch 8...
... Spring C ... Viscous fluid 117 Round 211! ! ! Agent Patent Attorney Yoshio Saifuji O+ qo' Figure b (A)

Claims (2)

[Claims] (1) A movable shaft that can be freely rotated by a door, etc. is disposed inside the case, and a movable member that can be rotated in only one direction together with the movable shaft is interposed with a spring one-way clutch so that it can be disconnected or disconnected depending on the direction of rotation. , the viscous fluid in the case is disposed between the case and the movable member, and a spring is disposed in the case with each end hooked to the case and the movable shaft. A damper for flap doors using viscous fluid. (2) The case has a movable shaft that is supported so that it can rotate when the door is opened and closed, at a position that is approximately approximate to the door load torque curve and lower than the door load torque curve when the door is opened and closed. , the force of a spring is applied to the case and the movable shaft by hooking each end thereof, and the difference between the door load torque curve and the spring force is applied to the case and the movable shaft in one direction together with the movable shaft. A damper for a flap door using a viscous fluid, and its braking force control, characterized in that the shearing resistance of the viscous fluid is applied between a movable member rotatably arranged and a case. Method.