JPH11325152A - Damper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper device in which the operational characteristic of a movable body is changed according to a load to be applied to the movable body (the damper device). SOLUTION: In a damper device which is provided with a casing 1, a viscous fluid 4 sealed in the casing 1, a movable body 2 provided in the casing 10, and an orifice 7 such as a pore and an aperture through which the viscous fluid 4 flows along with the operation of the movable body 2, and applies the damping force to the action of the movable body 2 by the resistance of the viscous fluid 4 flowing through the orifice 7, the orifice 7 is provided in an elastic body 6. The elastic body is deformed according to the force to be applied to the movable body 2, and shape and the sectional area of the orifice 7 are also changed according thereto. Thus, the operational speed can be controlled by changing the characteristic of the damping effect itself according to the force on the movable body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device for controlling an operation characteristic (damper characteristic) of a movable body according to a load applied to the movable body.

[0002]

2. Description of the Related Art Conventionally, as a damper device for controlling the operating characteristics of a movable body, there is a damper device described in, for example, JP-A-7-103277. In this damper device, as shown in FIG. 13, a cap 42 is fitted in a cylindrical casing 41, and a rotation shaft 43 for receiving a rotation input from the outside is rotatably supported in the B1 and B2 directions inside thereof. A helical groove 44 whose pitch changes in accordance with the rotation angle in the B1 and B2 directions is formed on the peripheral surface. A disk-shaped wall member 45 is disposed in the casing 41. The wall member 45 engages with the groove 44 and moves along the guide portion 46 along the guide portion 46 in conjunction with the rotation of the rotating shaft 43 in the B1 and B2 directions. , C2. The space in the casing 41 was filled with oil 47 as a viscous fluid substance.

When the rotary shaft 43 is rotated, a spiral groove 44 whose pitch changes in accordance with the rotation angle is formed. The wall member 45 engaged with the spiral groove 44 is The moving amount changes according to the rotation angle of the shaft 43, and the strength (characteristic) of the damper action changes according to the rotation angle position of the rotation shaft 43.

[0004] For example, if the upper body has a constant weight, such as an opening / closing part of a copying machine, and is used by mounting it on a rotating torque that changes in accordance with the opening / closing angle position, an impact during the closing operation of the body is obtained. It could be reduced.

[0005]

However, in the above-mentioned conventional damper device, it is possible to control the strength (characteristics) or operating speed of the damper action in accordance with the rotational angle position of the rotating shaft 43, that is, the operating position. However, the operating characteristics of the damper device cannot be controlled in accordance with the load applied to the damper device regardless of the operation position.

[0006] For example, there is a case where the weight of a storage item to be stored in a storage rack 48 as a storage portion is not constant as in a rack lifting type storage device (for example, Japanese Patent Application Laid-Open No. 7-148029) shown in FIG. A damper device 49 is attached so that the storage rack 48 slowly descends when the storage rack 48 is pulled down. When the damper device 49 is a damper device as described in the related art, if the weight of the stored item is heavy, the descent speed of the storage rack is increased, and there is a fear that it is dangerous. If the weight of the stored item is light, There was a problem that the storage rack descended slowly and felt kinky

[0007]

In order to solve the above-mentioned problems, the present invention provides a casing, a viscous fluid sealed in the casing, a movable body disposed in the casing,
A damper having an orifice hole such as a pore or a gap through which the viscous fluid flows with the operation of the movable body, and a buffering force acting on the operation of the movable body with a resistance force when the viscous fluid flows through the orifice hole In the apparatus, the orifice hole is provided in an elastic body such as rubber or resin. According to the invention, when a force is applied to the movable body, the internal pressure changes, so that the elastic body is deformed, and the shape and cross-sectional area of the orifice hole provided in the elastic body also change. If the force applied to the movable body changes, the shape and cross-sectional area of the orifice hole will change, and the characteristics of the resistance force acting on the movable body itself will change. For this reason, the operation characteristics (cross-sectional area of the orifice hole) can be changed according to the force acting on the movable body. For example, even if the magnitude of the force acting on the movable body changes, the operation speed of the movable body can be kept substantially constant.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 is an invention in which a movable body disposed in the casing, a casing, a viscous fluid sealed in the casing, and an operation of the movable body. And an elastic body having an orifice hole through which the viscous fluid flows, and a damping force acting on the operation of the movable body with a resistance force when the viscous fluid flows through the orifice hole.

When a force acts on the movable body, the viscous fluid, that is, the internal pressure of the casing changes, and the elastic body is deformed by the internal pressure. Also, if the force acting on the elastic body changes,
The shape of the elastic body also changes according to the change. The orifice hole through which the viscous fluid flows and exerts a buffering force on the operation of the movable body is installed in this elastic body, and the shape and cross-sectional area of the orifice hole change with the deformation of the elastic body. . That is, the shape and cross-sectional area of the orifice hole change according to the force applied to the movable body. Since the characteristics of the damper device mainly depend on the shape and cross-sectional area of the orifice hole,
In the damper device of the present invention, the characteristics of the damper action itself can be changed according to the force acting on the movable body. In addition, the configuration is very simple in that an orifice hole is provided in the elastic body, and the above-described effects can be easily obtained.

According to a second aspect of the present invention, the casing, the movable body disposed in the casing, the viscous fluid sealed in the casing, and the viscous fluid flow with the operation of the movable body. In a damper device comprising an elastic body having an orifice hole, wherein a damping force is applied to the operation of the movable body by a resistance force when a viscous fluid flows through the orifice hole, the orifice hole is changed in accordance with a force applied to the movable body Is characterized in that the cross-sectional area changes.

Since the characteristics of the damper device mainly depend on the shape and cross-sectional area of the orifice hole, the damper device of the present invention can change the characteristics of the damper operation itself according to the force acting on the movable body. . Moreover, the configuration is very simple, with an orifice hole in the elastic body,
The above effects can be easily obtained.

Further, the invention according to claim 3 is characterized in that the cross-sectional area of the orifice hole decreases as the force applied to the movable body increases, which is compared with the case of a fixed orifice having a fixed shape. In addition, since the operating speed of the movable body when a load is applied becomes slow, the movable body can be used as a safety means against load fluctuation.

According to a fourth aspect of the present invention, the cross-sectional area of the orifice hole is changed mainly by deformation of the elastic body in the tensile and compression directions, and tensile or compressive stress acts on the elastic body. However, since almost no shear stress acts, the durability of the elastic body is improved, and the reliability and durability of the damper device are also improved.

According to a fifth aspect of the present invention, the cross-sectional area of the orifice hole is changed mainly by the deformation of the elastic body in the bending direction. And the reliability and durability of the damper device are also improved.

According to a sixth aspect of the present invention, the sectional area of the orifice hole is changed mainly by a force acting in a direction perpendicular to the flow direction in the orifice hole provided in the elastic body. is there. Since the deformation of the orifice hole is in the same direction as the applied force, the orifice hole is apt to be deformed, so that a characteristic of largely changing the orifice hole even with a small load fluctuation can be obtained. To obtain the same amount of change, an elastic body having high hardness may be used, and in this case, the durability of the elastic body can be further improved.

According to a seventh aspect of the present invention, the sectional area of the orifice hole is changed mainly by a force acting in the same direction as the flow direction in the orifice hole provided in the elastic body. is there. The deformation of the orifice hole is caused by the deformation of the elastic body in a direction perpendicular to the acting force, so that the orifice hole is hardly deformed. For this reason, it is effective when the orifice hole does not want to change much even with a large load change.

Further, the invention according to claim 8 is provided with a plurality of elastic bodies provided with orifice holes, and each of the orifice holes is deformed in accordance with a load. The characteristic which cannot be achieved only by the orifice hole can be obtained.

According to a ninth aspect of the present invention, a plurality of orifice holes are provided in the same elastic body. Each of the orifice holes is deformed according to a load, and a plurality of orifice holes are provided. It is possible to obtain characteristics that cannot be achieved with only one orifice hole, and it is not necessary to use a plurality of elastic bodies, so that the configuration can be simplified.

Further, according to a tenth aspect of the present invention, a pressure receiving member is provided in contact with an elastic member, and a force received by the pressure receiving member is transmitted to the elastic member to change a sectional area of the orifice hole. Yes, the pressing surface of the elastic body can be pressed uniformly, preventing local deformation of the elastic body and improving the durability of the elastic body. Further, depending on the shape of the pressure receiving member, the magnitude of the force applied to the elastic body can be changed.

The invention according to claim 11 has a structure in which substantially the same damper effect is obtained when the movable body is operated in one direction and when the movable body is operated in the opposite direction. . Even when it is necessary to control the operating characteristics of the movable body in both directions, one damper device can be used,
This leads to simplification of the device.

Further, the invention according to claim 12 is provided with an air layer separating means in order to obtain a sufficient damper effect even if the casing is installed in any direction such as sideways or upside down. The degree of freedom of design when assembling the damper device is increased.

The invention according to claim 13 is configured such that the moving speed of the movable body becomes substantially constant even when the force applied to the movable body changes, and the load applied to the damper device is reduced. Even in the case of fluctuation, the operation speed of the damper device can be kept substantially constant.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of a damper device according to a first embodiment of the present invention, and FIGS. 2A and 2B are partially enlarged sectional views of the damper device.

1 and 2, inside a cylindrical casing 1, there is a movable body 2 made of a rigid body such as resin or metal which moves along the inside of the casing 1. Member 3 which is a shaft penetrating a part of
Are connected. A viscous fluid 4 such as oil is sealed in the casing 1, and a sealing material 5 such as an O-ring or an X-ring seals a gap between the inner surface of the casing 1 and the outer surface of the movable body 2. In addition, the elastic body 6 made of rubber is attached to the movable body 2 with a play of play (so-called play).
An orifice hole 7 is provided through the elastic body 6. Here, the orifice hole 7 is
Are very small in size compared to the diameter of the pores. Also,
A passage for passing the viscous fluid 4 through the movable body 2 is formed in the movable body 2 so as to communicate with the office hole. Further, an air layer separating means 9 for separating the air layer 8 and the viscous fluid 4 existing in the casing 1 and a compression spring 10 are provided. In this embodiment, rubber is used as an example of the elastic body 6, but the rubber includes natural rubber, synthetic rubber, and other elastic bodies such as elastomer, resin, and elastic foam. Hereinafter, the same applies to Examples 2 to 6.

Next, the operation and operation will be described. When a force (a force acting leftward in FIGS. 1 and 2) that pushes the linking member 3, which is a shaft, into the casing 1 is applied, the force is directly applied to the movable body 2 via the linking member 3, 2 compresses the viscous fluid 4a on the left side. The fluid 4 flows from the left side to the right side of the movable body 2 through the passage provided in the movable body 2 and the orifice hole 7 provided in the elastic body 6. Due to this flow, the movable body 2 moves from the right side to the left side. However, the movable body 2 receives a resistance force from the left to the right due to the resistance force when the viscous fluid 4 flows through the orifice hole 7 which is a fine hole, and the operating speed is increased. Slows down. This is the damper effect. Note that the moving speed of the movable body 2 depends on the shape and the sectional area of the orifice hole 7.

When the viscous fluid 4a on the left side of the movable body 2 is compressed, the pressure of the viscous fluid 4 also acts on the surfaces 6a, 6b, 6c of the elastic body 6. As a result, FIG.
As shown in (1), the elastic body 6 is compressed, and the cross-sectional area of the orifice hole 7 provided in the elastic body 6 also changes. Also,
If the force applied to the movable body 2 changes, the compressive force of the viscous fluid 4 also changes, so that the pressure acting on the elastic body 6 also changes, and the deformation of the elastic body 6 and the shape or sectional area of the orifice hole 7 also change. . Therefore, the sectional area of the orifice hole 7 changes according to the force applied to the movable body 2, that is, the damper device.

1 and 2, when the force acting on the movable body 2 increases, the amount of compression of the elastic body 6, that is, the amount of deformation of the orifice hole 7 also increases, and the sectional area of the orifice hole tends to decrease. It is in. That is, the relationship between the damper load (force acting on the movable body) indicating the characteristics of the damper and the operating speed of the movable body 2 is as shown in FIG. 3D for a fixed orifice provided on a general rigid body. On the other hand, in the damper device of the present invention, the relationship is, for example, E. Therefore, even when the load increases, the moving speed of the movable body acts to be suppressed, and the operation speed of the movable body 2 can be stably maintained at a certain safe speed or less.

The characteristics of the damper device as shown in FIG. 3E are determined by various factors such as the deformation characteristics of the elastic body 6, the shape of the orifice hole 7, the cross-sectional area, and the like. Properties can be obtained. For example, if the load is a characteristic as shown in FIG. 4, that is, a load equal to or more than a certain value, the moving speed of the movable body can be kept substantially constant even if the load fluctuates.

FIG. 5 shows an example in which a damper device having the characteristics shown in FIG. 4 is incorporated. For example, JP-A-9
This is an example of a case where a damper device is used by assembling it to a storage unit elevating and lowering support device disclosed in Japanese Patent No. 238756. When the storage unit 11 is pulled down from the inside of the storage cabinet 12 forward and downward, when the handle 13 at the lower end of the front end of the storage unit is pulled forward, the storage unit 11 is rotated as the parallel link 14 rotates forward. Starts to drop due to its own weight and the rotating moment due to the weight of the stored object placed on the storage unit 11, but the turning moment varies depending on the position of the storage unit 11, and the weight of the stored object mounted on the storage unit 11 Also fluctuates. Therefore, when the conventional damper device is used as the damper device 15, if a heavy storage item is placed on the storage portion 11, the storage portion 11 may drop at a high speed and may be dangerous. However, when the damper device of the present invention as shown in the figure is used as the damper device 15, the rotational moment of the parallel link 14 depends on the position of the storage portion 11, the weight of the storage object placed on the storage portion 11, and the like. Even if it fluctuates, the storage section 11 can realize safe and easy-to-use descent at a substantially constant speed. In addition, even when a large load is mounted on the storage unit, the storage unit can be lowered slowly, so that the maximum load capacity of the storage device can be increased.

FIG. 5 shows that the storage portion 11 is not affected by the weight of the stored items even if the handle 13 is released during the lowering operation.
Automatically lowers at the control speed of the damper device 15, but on the contrary, an elastic member such as a spring is applied to the storage portion 11 so that a pulling force larger than the weight of the storage item acts on the storage portion 11, and the handle is When the storage unit 11 is automatically released when the storage unit 11 is released from the storage cabinet 13 and is stored in the storage cabinet 12, the mounting direction of the damper device 15 is reversed so that the storage unit 11 is mounted. It is possible to realize a device capable of automatically ascending and storing at a safe and convenient speed within a predetermined range regardless of the presence or absence of loaded items and the weight of the stored items.

As described above, according to the first embodiment, the operation characteristics of the movable body 2 are varied according to the force applied to the movable body 2, and the operation of the movable body 2 is performed regardless of the operation position of the movable body 2. Properties can be conveniently controlled. Further, since the linking member 3 as a shaft is configured to enter and exit the inside and outside of the casing 1, an air layer 8 having a volume equal to or greater than the volume of the linking member 3 entering and exiting the casing 1 is required. Connecting member 3
Is moved to the left, a part of the linking member 3 outside the casing 1 enters the casing 1, so that the volume occupied by the rigid body in the casing 1 increases. However, when a fluid such as oil is used, the fluid is incompressible.
Cannot be moved. In other words, the air layer 8 that absorbs the volume of the linking member 3 going in and out is required. This is because the air layer 8 can be easily compressed and can absorb the increased volume. However, when the air layer 8 is simply sealed, there is no problem when the casing 1 is used upright. However, when the casing 1 is installed horizontally as shown in FIG. The air in the air layer 8 may pass through the orifice hole 7. When the air passes through the orifice hole 7, the resistance at that time becomes small, and the moving speed of the movable body 2 rapidly increases, so that the effect as a damper is not exhibited.

The air layer separating means 9 shown in FIG. 1 separates the viscous fluid 4 and the air layer 8 inside the casing 1,
It is configured to move right and left as the link member 3 moves in and out.
When the link member 3 is moved leftward, the air layer separating means 9 moves rightward, and the air layer 8 absorbs the volume of the pushed link member 3. Conversely, when the link member 3 is moved rightward, the air layer separating means 9 is moved leftward. The compression spring 1
Numeral 0 is for assisting the movement of the air layer separating means 9 to the left. As a result, a change in volume caused by taking in and out of the link member 3 is absorbed by the expansion and contraction of the air layer 8, and the air layer 8 and the viscous fluid 4 do not coexist. A damper effect can be obtained. When the damper device is used upright, the air layer isolating means 9 is not particularly required.

FIG. 2B shows that the movable body 2 receives a force,
Although the elastic body 6 is in a deformed state, the orifice hole 7
Of the elastic body 6, that is, the deformation of the elastic body 6
b, caused by the pressure acting on 6c. That is, compression and tension stresses are applied, but no shear stress is applied. The stress is very small as compared with the case where a shear force is applied, and the durability of the elastic body 6 receiving the stress is remarkably improved. be able to. Although a seal between the inner surface of the casing 1 and the outer surface of the movable body 2 and a seal between the casing 1 and the engaging member 3 were formed by using a sealing material 5 such as an O-ring or an X-ring,
Other sealing means such as a piston seal or V packing may be used.

FIG. 6 shows an example of a damper device in which the movable body 2 moves on a straight line. However, a rotary type which exerts a resistance against the rotation of the rotary shaft 16 as shown in FIG. It may be a damper device, or another trajectory.

(Embodiment 2) FIGS. 7A and 7B are partially enlarged sectional views of a damper device according to Embodiment 2 of the present invention.
The same reference numerals are given to the same components as those of the first embodiment shown in FIG.

The configuration of the entire damper device is the same as that of the first embodiment, but is different from the first embodiment in that the elastic member 6 is installed in a different form.
The elastic body 6 is installed in a configuration as shown in FIG. 7A, and a pressure receiving member 17 is provided in contact with the surface of the elastic body 6. The elastic body 6 and the pressure receiving member 17 are loosely attached so as to be able to move to some extent in the left-right direction. When a force acts on the movable body 2 to the left, the movable body 2 is deformed as shown in FIG. The pressure received by the pressure receiving member 17 is transmitted to the elastic body 6, and the elastic body 6 is compressed, and the orifice hole is compressed.
In this case, the orifice hole 7 is deformed mainly by a force acting in a direction perpendicular to the flow direction in the orifice (left and right in the figure). Since the direction in which the orifice hole 7 is deformed is the same as the direction of the compressive force acting on the elastic body 2, the orifice hole 7 is easily deformed. Characteristics can be obtained. When the same amount of deformation is obtained, an elastic body 6 such as a high-grade rubber may be used, and the durability of the elastic body 6 can be further improved. Further, since this deformation is compression deformation, the durability of the elastic body 6 is improved as compared with the case where shear deformation acts, and the durability as a damper device is also improved. In addition, when the pressure receiving member 17 is used, the pressing surface of the elastic body 6 can be pressed uniformly, thereby preventing local deformation of the elastic body 6 and improving the durability of the elastic body 6. Further, the configuration shown in FIG. 7 also has a seal configuration 18. Further, depending on the configuration of the pressure receiving member 17, the magnitude of the force applied to the elastic body 6 can be changed.

(Embodiment 3) FIGS. 8A and 8B are partially enlarged sectional views of a damper device according to Embodiment 3 of the present invention.
The same reference numerals are given to the same components as those of the first embodiment shown in FIG.

The structure of the entire damper device is the same as that of the first embodiment, but is different from the first embodiment in the configuration of the elastic member. The elastic body 6 is installed in a configuration as shown in FIG.
When a force acts on the movable body 2 to the left, the movable body 2 is deformed as shown in FIG. This is because the orifice hole 7 is mainly in the same direction as the flow direction in the orifice (left-right direction in the figure).
Is deformed by the force acting on the That is, the elastic body 6 which has received pressure from the left side is compressed and expands in a direction perpendicular to this direction, so that the orifice hole 7 is narrowed. This is a configuration in which the orifice hole 7 is hardly deformed, and is effective when the orifice hole 7 does not want to be changed much even with a large load change. Further, since this deformation is compression deformation, the durability of the elastic body 6 is improved as compared with the case where shear deformation acts, and the durability as a damper device is also improved.

(Embodiment 4) FIG. 9 is a partially enlarged sectional view of a damper device according to Embodiment 4 of the present invention, and the same reference numerals are given to the same components as those in Embodiment 1 shown in FIG. .

The configuration of the entire damper device is the same as that of the first embodiment, but is an example in which a plurality of elastic bodies 6 having orifice holes 7 are provided. Each of the orifice holes 7 performs the operation and operation as described in the first embodiment, and by combining a plurality of them, it becomes possible to obtain characteristics that cannot be achieved by only one orifice hole 7. In the example of FIG. 9, two elastic bodies are provided, but the orifice holes 7 provided in each of them are provided.
And the like may be the same or different. For example, as shown in FIG. 10, when the elastic bodies 6 having the orifice holes 7 having the characteristics shown by the broken lines F and G are installed at the same time, they are combined to form the shape shown by the solid line H. A close damper device can be obtained.

(Embodiment 5) FIG. 11 is a partially enlarged sectional view of a damper device according to Embodiment 5 of the present invention, and the same components as those in Embodiment 1 shown in FIG. . The configuration of the entire damper device is the same as that of the first embodiment, but is an example in which the same elastic body 6 is provided with a plurality of orifice holes 7. The same operation and effect as those of the fourth embodiment can be obtained, and the number of the elastic bodies 6 can be reduced, which leads to simplification of the device and reduction of the number of parts.

(Embodiment 6) FIG. 12 is a partially enlarged sectional view of a damper device according to Embodiment 6 of the present invention, and the same components as those in Embodiment 1 shown in FIG. .

The structure of the entire damper device is the same as that of the first embodiment. However, in addition to the case where a force is applied to the left of the movable body 2 as shown in the first embodiment, the same applies to the case where a force is applied to the right. This is an example in which the orifice hole 7 provided in the elastic body 6 is configured to deform similarly. When a leftward force is applied, the elastic body 6 and the orifice hole 7 are deformed as shown in FIG. 12C when a rightward force is applied. I do. The operation and effect are the same as those in the first embodiment, and substantially the same buffer effect can be obtained even when a force is applied in either the left or right direction. Even when it is necessary to control the operating speed (characteristics) of the movable body 6 in both directions, one damper device can cope with the need, which leads to simplification of the device. Further, in this configuration, since the elastic body 6 is deformed mainly in the bending direction, almost no shear force acts on the elastic body 6 and the durability of the elastic body 6 is improved.

In this example, a configuration is shown in which one elastic body gives a damper action to a load in both the left and right directions. However, two components in FIG. The same effect can be obtained even if the orientation is set.

[0046]

As described above, according to the present invention, the orifice hole is provided in the elastic body in the damper device in which the vibrating fluid acts on the movable body by a resistance force when flowing through the orifice hole. The elastic body deforms in response to the force applied to the movable body, and the shape and cross-sectional area of the orifice hole change accordingly. Therefore, the characteristics of the damper action itself can be changed according to the force acting on the movable body. In addition, the configuration is very simple in that an orifice hole is provided in the elastic body, and the above-described effects can be easily obtained. In addition, in a damper device characterized in that the cross-sectional area of the orifice hole decreases as the force applied to the movable body increases, compared to a case of a fixed orifice having a fixed shape, the movable body does not move when the same load acts. Since the operation speed becomes slow, it can be used as a safety means against load fluctuation.

When the cross-sectional area of the orifice hole is mainly changed by the deformation of the elastic body in the tensile and compression directions, the elastic body hardly acts on the elastic body. Can be improved.

When the cross-sectional area of the orifice hole is mainly changed by the deformation of the elastic body in the bending direction, the shearing force hardly acts on the elastic body, so that the durability of the elastic body is improved. be able to.

When the cross-sectional area of the orifice hole is changed mainly by a force acting in a direction perpendicular to the flow direction in the orifice hole provided in the elastic body, the deformation of the orifice hole is not affected. Since the force is in the same direction as the force to be applied, it is easy to be deformed, and the characteristic that the orifice hole is largely changed even with a small load change can be obtained. To obtain the same amount of change, an elastic body having high hardness may be used, and in this case, the durability of the elastic body can be further improved.

When the cross-sectional area of the orifice hole is changed mainly by the force acting in the same direction as the flow direction in the orifice hole provided in the elastic body, the deformation of the orifice hole is The orifice hole is deformed by the deformation of the elastic body in a direction perpendicular to the acting force, and the orifice hole is hardly deformed. For this reason, it is effective when the orifice hole does not want to change much even with a large load change.

When a plurality of elastic bodies provided with orifice holes are provided, each of the orifice holes is deformed in accordance with a load. No properties can be obtained.

When a plurality of orifice holes are provided in the same elastic body, each of the orifice holes is deformed according to the load, and by providing a plurality of the orifice holes, only one orifice hole can be formed. In addition to the above, it is possible to obtain a combined characteristic, and it is not necessary to use a plurality of elastic bodies, so that the configuration can be simplified.

Further, a pressure receiving member is installed in contact with the elastic body,
When the cross-sectional area of the orifice hole changes by transmitting the force received by the pressure receiving member to the elastic body, the pressing surface of the elastic body can be pressed uniformly, and the local deformation of the elastic body And improve the durability of the elastic body. Further, depending on the shape of the pressure receiving member, the magnitude of the force applied to the elastic body can be changed.

In a configuration in which substantially the same damper effect is obtained when the movable body is operated in one direction and when the movable body is operated in the opposite direction, the operation characteristics of the movable body in both directions are obtained. Can be controlled with a single damper device, which leads to simplification of the device.

Also, if the casing is provided with an air layer separating means so as to obtain a sufficient damper effect even if the casing is installed in an arbitrary direction such as a horizontal direction or a reverse direction, a sufficient damper can be provided regardless of the posture of the casing. The effect can be obtained, and the degree of freedom of design when assembling the damper device increases.

Further, even when the force applied to the movable body changes, the moving speed of the movable body can be made substantially constant, and the moving speed of the movable body is substantially kept even when a fluctuating load acts. It can be constant. Further, in order to obtain the required damper characteristics, the required characteristics can be obtained by changing the material, size and shape of the elastic body.

[Brief description of the drawings]

FIG. 1 is a sectional view of a damper device according to a first embodiment of the present invention.

FIG. 2A is a partially enlarged cross-sectional view of the damper device. FIG. 2B is a partially enlarged cross-sectional view of the damper device when a force is applied in a leftward direction.

FIG. 3 is a graph showing a relationship between a load of the damper device and an operation speed of a movable body.

FIG. 4 is a graph showing a relationship between a load of the damper device and an operation speed of a movable body.

FIG. 5 is a schematic view of a device showing an example of use of the damper device.

FIG. 6 is a sectional view showing another embodiment of the damper device.

7A is a partially enlarged cross-sectional view of a damper device according to a second embodiment of the present invention. FIG. 7B is a partially enlarged cross-sectional view of the damper device when a left-handed force is applied.

8A is a partially enlarged cross-sectional view of a damper device according to a third embodiment of the present invention. FIG. 8B is a partially enlarged cross-sectional view of the damper device when a left-handed force is applied.

FIG. 9 is a partially enlarged sectional view of a damper device according to a fourth embodiment of the present invention.

FIG. 10 is a graph showing a relationship between a load of a damper device according to a fourth embodiment of the present invention and an operation speed of a movable body.

FIG. 11 is a partially enlarged sectional view of a damper device according to a fifth embodiment of the present invention.

12A is a partially enlarged cross-sectional view of a damper device according to a sixth embodiment of the present invention. FIG. 12B is a partially enlarged cross-sectional view of the damper device when a left-handed force is applied. Enlarged sectional view of the damper device in the case

13A is a schematic side view of a conventional damper device, and FIG. 13B is a schematic sectional view of a conventional damper device.

FIG. 14 is a schematic diagram of a device showing an example of use of the damper device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Movable body 3 Linking means 4 Viscous fluid 6 Elastic body 7 Orifice hole 8 Air layer 9 Air layer isolating means 17 Pressure receiving member

Claims (13)

[Claims] A movable body provided in the casing; a viscous fluid sealed in the casing; and an elastic body having an orifice hole through which the viscous fluid flows as the movable body moves. And a damper device for applying a buffering force to the operation of the movable body by a resistance force when the viscous fluid flows through the orifice hole. A movable body provided in the casing, a viscous fluid sealed in the casing, and an elastic body having an orifice hole through which the viscous fluid flows as the movable body moves. In a damper device that acts on the operation of the movable body with a resistance force when the viscous fluid flows through the orifice hole, a cross-sectional area of the orifice hole changes according to a force applied to the movable body. Characteristic damper device. 3. The damper device according to claim 1, wherein the cross-sectional area of the orifice hole decreases as the force applied to the movable body increases. 4. The damper device according to claim 1, wherein the cross-sectional area of the orifice hole is changed mainly by deformation of the elastic body in the tensile or compressive direction. 5. The damper device according to claim 1, wherein a sectional area of the orifice hole is changed mainly by deformation of the elastic body in a bending direction. 6. The damper according to claim 1, wherein the sectional area of the orifice hole is changed mainly by a force acting in a direction perpendicular to a flow direction in the orifice hole provided in the elastic body. apparatus. 7. The damper according to claim 1, wherein the sectional area of the orifice hole is changed mainly by a force acting in the same direction as the flow direction in the orifice hole provided in the elastic body. apparatus. 8. The damper device according to claim 1, wherein a plurality of elastic bodies provided with orifice holes are provided. 9. The damper device according to claim 1, wherein a plurality of orifice holes are provided in the same elastic body. 10. A cross-sectional area of an orifice hole is changed by installing a pressure receiving member in contact with an elastic body and transmitting a force received by the pressure receiving member to the elastic body. 2. The damper device according to claim 1. 11. A structure according to claim 1, wherein substantially the same damper effect is obtained when the movable body operates in one direction and when the movable body operates in the opposite direction. Damper device. 12. The damper device according to claim 1, further comprising air layer separating means for obtaining a sufficient damper effect even when the casing is installed in any direction such as a horizontal direction or a reverse direction. 13. Even when the force applied to the movable body changes,
13. The damper device according to claim 1, wherein the moving speed of the movable body is substantially constant.