JP2024128662A - Shock absorber - Google Patents

Abstract

To downsize an installation space with respect to a damping range in comparison with a conventional damper.SOLUTION: A buffer device (1) comprises: a first expanding/contracting part (11) and a second expanding/contracting part (12) having a hollow cylinder shape capable of internally housing fluid, constituted so as to be capable of expanding/contracting, of which one end part is supported by a second object (3), and curved with respect to a linear direction connecting a first object (2) and the second object (3); and a damping part (13) comprising a hole part (13a) having a smaller cross sectional area than the area of a cross section intersecting with an axis of a cylinder of each of the first expanding/contracting part (11) and the second expanding/contracting part (12), supported by the first object (2), arranged between the other end part of the first expanding/contracting part (11) and the other end part of the second expanding/contracting part (12), and in which fluid can move through the hole part (13a).SELECTED DRAWING: Figure 1

Description

The present invention relates to a shock absorber that provides shock absorption between a first object and a second object.

Dampers (vibration control devices, shock absorbers, damping devices) are known that reduce the movement or speed of an object in order to reduce shaking for passengers in aircraft, trains, automobiles, and other vehicles, reduce damage in the event of an accident, prevent damage to valuables during transportation, or reduce shaking of buildings during earthquakes.

FIG. 12 is an explanatory diagram of a conventional damper.
12, a conventional damper 01 has a cylindrical cylinder 02 and a piston 03 that can move axially inside the cylinder 02. In the damper 01, a damping hole 03b is formed in a disk 03a at the tip of the piston 03. In a case where an object to be damped is connected to the piston 03 side and the cylinder 02 side is fixed, when the piston 03 moves axially inside the cylinder 02, fluid moves from the lower side to the upper side of the disk 03a through the damping hole 03b, and the movement resistance of the fluid at that time suppresses the movement of the piston 03, thereby cushioning and damping the object.

(Problems with the Prior Art)
In the damper 01 of the prior art, the vibration-damping range (the range in which vibrations and movement can be damped) is the movable range of the piston 03. Therefore, the space required when installing the damper 01 is premised on the piston 03 being in its most extended state. In this state, the axial length of the cylinder 02 and the piston 03 is approximately twice the movable range of the piston 03, and it is necessary to ensure a space approximately twice as large as the vibration-damping range (the movable range of the piston 03). Therefore, a large installation space is required for the vibration-damping range of the damper 01, and it may be difficult to install the damper 01.
In addition, the piston 03 can only move linearly in one axial direction along the axial direction of the cylinder 02, and the damper 01 can only damp vibration in one axial direction.

The technical objective of this invention is to reduce the installation space required for the damping range compared to conventional dampers.

In order to solve the above technical problem, the shock absorber of the invention described in claim 1 comprises:
1. A shock absorber for shock absorbing between a first object and a second object, comprising:
a first expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and is configured to be expandable and contractable along an axial direction of the cylinder, one end of which is supported by the second object, and which is curved with respect to a straight line connecting the first object and the second object;
a second expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and is configured to be expandable and contractable along an axial direction of the cylinder, one end of which is supported by the second object, and which is curved with respect to a straight line connecting the first object and the second object;
a damping section having a hole having a cross-sectional area smaller than the cross-sectional area of the first telescopic section and the second telescopic section intersecting the axis of the tube, the damping section being supported by the first object and being disposed between the other end of the first telescopic section and the other end of the second telescopic section, and through which a fluid can move;
The present invention is characterized by comprising:

In order to solve the above technical problem, the shock absorber of the present invention described in claim 2 comprises:
1. A shock absorber for shock absorbing between a first object and a second object, comprising:
a first expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and that is configured to be expandable and contractable along an axial direction of the cylinder, and that has one end supported by the first object;
A second expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and is configured to be expandable and contractable along an axial direction of the cylinder, and is accommodated inside the first expandable portion;
a damping section having a flow path connecting an inside of the first telescopic section and an inside of the second telescopic section, the damping section being supported by the second object and having the other end of the first telescopic section and the other end of the second telescopic section supported thereon;
The flow path has a cross-sectional area smaller than the area of a cross section intersecting the axis of the tube of the first telescopic section and the second telescopic section;
The present invention is characterized by comprising:

In order to solve the above technical problem, the shock absorber of the present invention described in claim 3 comprises:
1. A shock absorber for shock absorbing between a first object and a second object, comprising:
a first expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and that is configured to be expandable and contractable along a first axial direction of the cylinder, and that has one end supported by the first object;
a second expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and is configured to be expandable and contractable along a second axial direction of the cylinder, one end of which is supported by the second object and is disposed such that the second axial direction extends in a direction intersecting the first axial direction;
a damping section having a flow path connecting an inside of the first telescopic section and an inside of the second telescopic section, the damping section being supported by the second object and having the other end of the first telescopic section and the other end of the second telescopic section supported thereon;
The flow path has a cross-sectional area smaller than the area of a cross section intersecting the axis of the tube of the first telescopic section and the second telescopic section;
The present invention is characterized by comprising:

The invention described in claim 4 is the shock absorber described in claim 3,
A plurality of the second elastic portions;
The flow path includes a first flow path portion connected to the first expandable portion, and a second flow path portion branching from the first flow path portion and extending to each of the second expandable portions;
The present invention is characterized by comprising:

In order to solve the above technical problem, the shock absorber of the present invention described in claim 5 comprises:
1. A shock absorber for shock absorbing between a first object and a second object, comprising:
a first expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and that is configured to be expandable and contractable along a first axial direction of the cylinder, and that has one end supported by the first object;
a second expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and is configured to be expandable and contractable along a second axial direction of the cylinder, one end of which is supported by the first object and is disposed such that the second axial direction extends in a direction intersecting the first axial direction;
a damping section having a flow path connecting an inside of the first telescopic section and an inside of the second telescopic section, the damping section being supported by the second object and having the other end of the first telescopic section and the other end of the second telescopic section supported thereon;
The flow path has a cross-sectional area smaller than the area of a cross section intersecting the axis of the tube of the first telescopic section and the second telescopic section, and the flow path is formed by surrounding an outer surface of the first object;
The present invention is characterized by comprising:

The present invention as set forth in claim 6 is the shock absorber as set forth in claim 5,
a first elastic member that is arranged to face the first expandable portion across the first object along the first axial direction and is elastically deformable;
a second elastic member that is arranged to face the second expandable portion across the first object along the second axial direction and is elastically deformable;
The present invention is characterized by comprising:

The invention described in claim 7 is the shock absorber according to any one of claims 1 to 6,
The first stretchable portion has a bellows shape in which mountain folds and valley folds are alternately formed along the axial direction of the tube;
The second stretchable portion has a bellows shape in which mountain folds and valley folds are alternately formed along the axial direction of the tube;
a restricting member that is supported along an outer periphery of the mountain fold line when viewed from the outside and restricts outward expansion of the first stretchable portion and the second stretchable portion;
The present invention is characterized by comprising:

According to the invention described in claim 1, compared to conventional dampers that perform uniaxial vibration control and require installation space approximately twice the size of the damping range, vibration control can be performed by the expansion and contraction of two curved expansion sections, and the installation space can be reduced relative to the damping range.

According to the invention described in claim 2, the movement can be damped by a configuration in which the second expansion section is housed inside the first expansion section, and the installation space required for the damping range can be reduced compared to conventional dampers that perform uniaxial vibration control, which require approximately twice the installation space for the damping range.

According to the invention described in claim 3, the axial direction of the first and second expandable sections are arranged to intersect, and compared to conventional dampers that perform uniaxial vibration control, which require approximately twice the installation space for the attenuation range, the installation space required for the attenuation range can be reduced.

According to the invention described in claim 4, the allowable amount of fluid that can flow between the expansion sections can be increased compared to when there is only one second expansion section.

According to the invention described in claim 5, the axial direction of the first and second expandable sections are arranged to intersect, and compared to conventional dampers that perform uniaxial vibration control, which require approximately twice the installation space for the attenuation range, the installation space required for the attenuation range can be reduced.

According to the sixth aspect of the present invention, the movement of the object can be damped by the elastic force, and the damping performance can be improved, compared to a case in which the elastic member is not provided. Also, the elastic force of the elastic member can return the first object to its position before it moved.
According to the seventh aspect of the present invention, the expansion of the expansion section can be suppressed, and the deterioration of the damping performance can be suppressed, compared to a case in which no restricting member is provided.

FIG. 1 is an overall explanatory view of an example of a shock absorber according to the present invention. FIG. 2 is a cross-sectional view of a main part of FIG. FIG. 3 is a diagram for explaining the operation of the first embodiment when no wire is provided on the damper tube. FIG. 4 is an explanatory diagram of a shock absorber according to a second embodiment. FIG. 5 is an explanatory diagram of a shock absorber according to a third embodiment, and is a cross-sectional view of a main portion. 6A and 6B are diagrams illustrating the operation of the third embodiment, in which FIG. 6A is a diagram illustrating a state in which the first damper tube is expanded, and FIG. 6B is a diagram illustrating a state in which the first damper tube is contracted. FIG. 7 is a perspective view of a shock absorber according to a fourth embodiment. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. FIG. 9 is an explanatory diagram of a modification of the fourth embodiment. FIG. 10 is an explanatory diagram of a shock absorber according to a fifth embodiment, in which FIG. 10A is a plan view and FIG. 10B is a perspective view. FIG. 11 is a cross-sectional view taken along line XI-XI of FIG. 10A. FIG. 12 is an explanatory diagram of a conventional damper.

Next, specific examples of the present invention (hereinafter, referred to as examples) will be described with reference to the drawings, but the present invention is not limited to the following examples.
In the following description using the drawings, illustrations of components other than those necessary for the description are omitted as appropriate to facilitate understanding.

FIG. 1 is an overall explanatory view of an example of a shock absorber according to the present invention.
FIG. 2 is a cross-sectional view of a main part of FIG.
In Fig. 1, a damper 1 as an example of a shock absorber of the present invention is installed between an object to be damped 2 as an example of a first object and a fixed wall 3 as an example of a second object. The fixed wall 3 in the first embodiment is formed in a bifurcated shape. The object to be damped 2 in the first embodiment is connected to the fixed wall 3 via a connecting plate 4 as an example of a support. The connecting plate 4 is supported at one end, i.e., a fixed end 4a, at a base portion of the bifurcated branch of the fixed wall 3, and the object to be damped 2 is supported at the other end, i.e., a free end 4b. Therefore, the object to be damped 2 in the first embodiment is movable relative to the fixed wall 3 so as to vibrate in an arc shape centered on the fixed end 4a.

In Figures 1 and 2, the damper 1 of Example 1 has a first damper tube 11 as an example of a first telescopic section, a second damper tube 12 as an example of a second telescopic section, and a damping section 13 arranged between the first damper tube 11 and the second damper tube 12.
The first damper tube 11 is formed in a hollow cylindrical shape. The first damper tube 11 is formed in a bellows shape with mountain folds 11a and valley folds 11b alternately formed along the axial direction of the tube. Furthermore, the first damper tube 11 of the first embodiment is formed in a curved shape along the direction of the arc-shaped vibration of the vibration-damped object 2. Therefore, the first damper tube 11 is configured to be expandable and contractable along the direction of the arc of vibration of the vibration-damped object 2 (the axial direction of the tube).

The first damper tube 11 contains pressure oil, which is an example of a fluid and an example of a liquid, inside.
Further, a wire 14 as an example of a restricting member is supported along the outer periphery of the mountain fold line 11a of the first damper tube 11. The wire 14 is disposed in a manner surrounding the outer periphery of the first damper tube 11, and even if the pressure of the internal pressure oil increases and the first damper tube 11 tries to expand outward, the wire 14 restricts the outward expansion of the first damper tube 11 (suppresses the expansion).
The second damper tube 12 of the first embodiment has the same configuration as the first damper tube 11 .

The damping portion 13 is fixed to the vibration-damped object 2. In Fig. 2, the damping portion 13 is formed with a damping hole 13a, which is an example of a hole portion and connects the inside of the first damper tube 11 and the inside of the second damper tube 12. The damping hole 13a has a cross-sectional area A2 smaller than a cross-sectional area A1 of a cross section intersecting the cylindrical axis of the first damper tube 11 and the second damper tube 12 (the cross-sectional area of the portion of the valley fold line 11b, which has a smaller cross-sectional area than the mountain fold line 11a).
The first damper tube 11, the second damper tube 12, the damping portion 13, the wire 14, etc. constitute the damper 1 of the first embodiment.

(Function of Example 1)
In the damper 1 of the first embodiment having the above configuration, when the object to be damped 2 vibrates in the direction in which the first damper tube 11 extends, for example, the first damper tube 11 extends and the second damper tube 12 contracts. Therefore, the internal volume of the first damper tube 11 increases and the internal volume of the second damper tube 12 decreases. Accordingly, pressure oil tries to move from the second damper tube 12 to the first damper tube 11. Here, the cross-sectional area A2 of the damping hole 13a is smaller than the cross-sectional area A1 of the damper tubes 11 and 12. Therefore, resistance to the movement of the pressure oil is generated, and the extension of the first damper tube 11 and the contraction of the second damper tube 12 are suppressed, and the movement of the object to be damped 2 is also suppressed. Therefore, when the object to be damped 2 tries to vibrate due to a disturbance or the like, the damper 1 can apply the brakes and the object to be damped 2 can be cushioned.
In the damper 1 of the first embodiment, the extension range of the damper tubes 11, 12 corresponds to the vibration damping range, and the installation space can be made smaller overall than in the conventional damper 01 having a cylinder 02 and a piston 03.

In particular, in Example 1, the damper tubes 11 and 12 of the damper 1 are curved along an arc, which is the direction of movement of the vibration-damped object 2. Conventionally known dampers can only move along a linear direction, which is the direction of piston movement, and in order to damp vibration in an arc-shaped direction, additional parts such as sliders or modifications such as making the connecting parts long hole-shaped are required. When additional parts are required, there is a problem that the number of parts increases and the configuration becomes more complicated, making it more likely to break down. In addition, when the connecting parts are made long hole-shaped, there are problems such as play occurring in the connecting parts, causing delays in behavior and making it easy for abnormal noise to occur during operation. In response to these problems, Example 1 has damper tubes 11 and 12 that are curved in an arc, which suppresses the occurrence of failures, delays in behavior, abnormal noise, etc.

FIG. 3 is a diagram for explaining the operation of the first embodiment when no wire is provided on the damper tube.
In addition, in the first embodiment, the wire 14 is supported by the damper tubes 11 and 12. If the wire 14 is not provided, as shown in FIG. 3, when pressure oil flows in, the damper tubes 11 and 12 may expand radially instead of extending axially. If they expand radially, the damper tubes 11 and 12 may not expand as expected, and the vibration damping ability may decrease. In contrast, in the first embodiment, the wire 14 is provided, and the expansion of the damper tubes 11 and 12 is suppressed. Therefore, the decrease in the vibration damping ability of the damper 1 is suppressed. Note that, although the configuration in which the wire 14 is provided at the mountain fold line 11a has been exemplified, the wire 14 may be provided at the valley fold line 11b. In addition, when the damper tubes 11 and 12 are made of a highly rigid material that is not likely to expand, the wire 14 may not be provided.

FIG. 4 is an explanatory diagram of a shock absorber according to a second embodiment.
Next, a second embodiment of the present invention will be described. Differences from the first embodiment will be described. Configurations similar to those in the first embodiment will be given the same reference numerals, and detailed descriptions thereof may be omitted.
4, a vibration-damped object 2' of the second embodiment has a slider 22 guided on an S-shaped curved guide rail 21. A damper 1' of the second embodiment has a first damper tube 11' and a second damper tube 12' curved along the guide rail 21.

(Function of Example 2)
In the damper 1' of the second embodiment having the above-mentioned configuration, the damper tubes 11', 12' extend and retract in the direction of movement of the object to be damped 2' which moves along an S-shaped trajectory. With a conventional damper which can only move in one axial direction, it is difficult to damp the object to be damped 2' which moves in an S-shaped manner, but the damper 1' of the second embodiment is capable of damping the object to be damped 2' and, like the first embodiment, the occurrence of failures is also suppressed.
In the second embodiment, the vibration-controlled object 2' moves in an S-shape, but is not limited to this. It is also possible to accommodate a curved trajectory other than the arc-shaped curve of the first embodiment and the S-shape of the second embodiment, and it is also possible to accommodate a linear trajectory in an oblique direction.

FIG. 5 is an explanatory diagram of a shock absorber according to a third embodiment, and is a cross-sectional view of a main portion.
Next, a third embodiment of the present invention will be described. Differences from the first embodiment will be described. Configurations similar to those in the first embodiment will be given the same reference numerals, and detailed descriptions thereof may be omitted.
5, a damper 31 as an example of a shock absorber according to the third embodiment is disposed between a vibration-controlled portion 32 as an example of a first object and a fixed portion 33 as an example of a second object. The vibration-controlled portion 32 and the fixed portion 33 according to the third embodiment are disposed vertically in parallel and facing each other, as an example.

The damper 31 of the third embodiment has a first damper tube 41 as an example of a first expandable portion, a second damper tube 42 as an example of a second expandable portion, and a damping portion 43. The damping portion 43 of the third embodiment is supported by the fixing portion 33.
The first damper tube 41 has an outer bellows structure (outer shell) 41a and an inner bellows structure (inner shell) 41b, and a fluid such as pressure oil is filled between the outer bellows structure 41a and the inner bellows structure 41b. The inside of the inner bellows structure 41b of the first damper tube 41 is hollow.
One end of the first damper tube 41 is supported by the vibration-damped portion 32 , and the other end of the first damper tube 41 is supported by the damping portion 43 .
The second damper tube 42 of the third embodiment is housed in the hollow portion inside the first damper tube 41. That is, the outer diameter of the second damper tube 42 is smaller than the inner diameter of the first damper tube 41, and the axial length of the second damper tube 42 is also shorter than the length of the first damper tube 41. One end of the second damper tube 42 is supported by the damping portion 43, and the other end is sealed by a sealing wall 46.

The first damper tube 41 and the second damper tube 42 of the third embodiment are configured in a bellows shape, unlike those of the first embodiment.
The damping portion 43 has a flow passage 43a that connects the inside of the first damper tube 41 and the inside of the second damper tube 42. The cross-sectional area of the flow passage 43a is smaller than the cross-sectional area of the first damper tube 41 and the cross-sectional area of the second damper tube 42.

6A and 6B are diagrams illustrating the operation of the third embodiment, in which FIG. 6A is a diagram illustrating a state in which the first damper tube is expanded, and FIG. 6B is a diagram illustrating a state in which the first damper tube is contracted.
(Function of Example 3)
In the damper 31 of the third embodiment having the above-mentioned configuration, when the vibration-controlled part 32 moves away from the fixed part 33 as shown in Fig. 6A, or moves toward the fixed part 33 as shown in Fig. 6B, the first damper tube 41 receives a force that expands (Fig. 6A) or contracts (Fig. 6B). As a result, the pressure oil in the first damper tube 41 tries to move between the first damper tube 41 and the second damper tube 42 through the flow path 43a, but the cross-sectional area of the flow path 43a is formed narrow, which resists the expansion and contraction. Therefore, the vibration of the vibration-controlled part 32 is controlled.
In the damper 31 of Example 3 in which the second damper tube 42 is housed inside the first damper tube 41, it is possible to shorten the axial length overall compared to the conventional damper 01 having a cylinder 02 and a piston 03, and it is possible to reduce the overall size of the damper 31 relative to the vibration control range.

FIG. 7 is a perspective view of a shock absorber according to a fourth embodiment.
FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.
Next, a fourth embodiment of the present invention will be described. The differences from the first embodiment will be described. The same components as those in the first embodiment will be given the same reference numerals, and detailed descriptions thereof may be omitted.
7 and 8, a damper 51 as an example of a shock absorbing device of the fourth embodiment is disposed between a vibration-controlled part 52 as an example of a first object and a fixed part 53 as an example of a second object. As an example, the vibration-controlled part 52 and the fixed part 53 of the fourth embodiment are disposed such that the vibration-controlled part 52 is disposed upward and the fixed part 53 is disposed horizontally. The fixed part 53 may be a metal plate or other elastic material.

The damper 51 of the fourth embodiment has a first damper tube 61 as an example of a first expandable portion, a second damper tube 62 as an example of a second expandable portion, and a damping portion 63 .
A first face plate 61a is supported at one end of the first damper tube 61 of Example 4, and the first face plate 61a is in contact with the vibration-damped portion 52. The other end of the first damper tube 61 is supported on the upper surface of the damping portion 63. The axial direction of the first damper tube 61 of Example 4 extends along the up-down direction.
The second damper tube 62 in the fourth embodiment has a second face plate 62a supported at one end thereof, and the second face plate 62a is in contact with the fixed portion 53. The other end of the second damper tube 62 is supported on the side surface of the damping portion 63. The second damper tube 62 in the fourth embodiment has an axial direction extending along the horizontal direction. In the fourth embodiment, the second damper tubes 62 are provided on each of the four side surfaces of the rectangular parallelepiped damping portion 63. That is, in the fourth embodiment, a total of four second damper tubes 62 are provided. In the fourth embodiment, a configuration in which four second damper tubes 62 are provided is illustrated, but the present invention is not limited to this. It is possible to provide three or less, or five or more.
The damper tubes 61, 62 of the fourth embodiment are formed in a bellows shape, similar to the damper tubes 41, 42 of the third embodiment.

A flow path 64 is formed inside the damping section 63. The flow path 64 in Example 4 has a first flow path section 64a connected to the other end of the first damper tube 61 and a second flow path section 64b connected to the other end of the second damper tube 62. In Example 4, four second flow path sections 64b are provided corresponding to the four second damper tubes 62, and the four second flow path sections 64b are formed in a form that branches in four directions from the end of the first flow path section 64a. The flow path cross-sectional area of each of the flow path sections 64a, 64b is formed to be smaller than the cross-sectional area of each of the damper tubes 61, 62.

(Function of Example 4)
In the damper 51 of the fourth embodiment having the above-mentioned configuration, when the vibration-controlled part 52 moves (vibrates) in the vertical direction, the first damper tube 61 receives a force that expands and contracts. As a result, the pressure oil in the first damper tube 61 moves between the first damper tube 61 and the second damper tube 62 through the flow path 64, and the oil pressure of the pressure oil in the second damper tube 62 increases and decreases. In the fourth embodiment, the cross-sectional area of the flow path parts 64a and 64b is small, which acts as a resistance to the expansion and contraction of the first damper tube 61 when the pressure oil tries to move. Therefore, the vibration of the vibration-controlled part 52 is controlled.
In particular, in Example 4, four second damper tubes 62 are provided, and compared to the case where only one is provided, the four second damper tubes 62 can increase the allowable range of increase or decrease in hydraulic pressure, and the range of impact strength that can be damped by the first damper tube 61 can also be increased.
In the damper 51 of the fourth embodiment, the axial directions (expansion and contraction directions) of the first damper tube 61 and the second damper tube 62 are different from each other, and it is possible to shorten the length in one axial direction compared to the conventional damper 01 which expands and contracts in one axial direction. Therefore, it is also possible to reduce the size of the entire damper 51 relative to the vibration damping range.

FIG. 9 is an explanatory diagram of a modification of the fourth embodiment.
In the fourth embodiment, the configuration in which the other end of the second damper tube 62 is directly connected to the damping portion 63 is illustrated, but the present invention is not limited thereto. For example, as shown in FIG. 9, the damping portion 63 and the second damper tube 62 can be connected via a connecting tube 66 as an example of a connecting member. By configuring in this way, it is also possible to increase the degree of freedom of the space in which the damper 51 is installed. In addition, it is also possible to configure the first damper tube 61 and the second damper tube 62 to damp different damping portions by contacting one end side of the second damper tube 62 with a portion of a vibration target different from the vibration-controlled portion 52, instead of the fixed portion 53.
In addition, the number of the second damper tubes 62 is not limited to the number exemplified in the embodiment. By providing a plurality of the second damper tubes 62, it is possible to provide the required damping performance.

FIG. 10 is an explanatory diagram of a shock absorber according to a fifth embodiment, in which FIG. 10A is a plan view and FIG. 10B is a perspective view.
FIG. 11 is a cross-sectional view taken along line XI-XI of FIG. 10A.
Next, a fifth embodiment of the present invention will be described. Differences from the first embodiment will be described. Configurations similar to those in the first embodiment will be given the same reference numerals, and detailed descriptions thereof may be omitted.
10 and 11, a damper 71 as an example of a shock absorbing device of the fifth embodiment is installed between a movable cart 72 as an example of a first object and a floor surface 73 as an example of a second object.
A ball roller 72a is supported on the bottom of the movable carriage 72 of the fifth embodiment. The movable carriage 72 is configured to be movable on a floor surface 73. The movable carriage 72 of the fifth embodiment has an outer shape, for example, a hexagonal prism shape.

The damper 71 of Example 5 has a first damper tube 81 as an example of a first telescopic section, a second damper tube 82 as an example of a second telescopic section, a third damper tube 83 as an example of a third telescopic section, and a damping section 84.
The damping section 84 of the fifth embodiment is formed in the shape of a wall surrounding the movable carriage 72. Therefore, in the fifth embodiment, the damping section 84 is configured with a wall having a hexagonal cylindrical shape in a plan view in correspondence with the hexagonal column-shaped movable carriage 72. The bottom surface of the damping section 84 is fixed to the upper surface of the floor surface 73. A flow path 84a is formed inside the damping section 84, through which pressure oil can flow.

The movable carriage 72 is supported at one end of the first damper tube 81 of Example 5. The other end of the first damper tube 81 is supported by the inner circumferential surface of the damping section 84. Pressure oil is contained in the internal space of the first damper tube 81, and the internal space of the first damper tube 81 is connected to the flow path 84a. The axial direction of the first damper tube 81 of Example 5 extends along the horizontal direction.
The second damper tube 82 and the third damper tube 83 of Example 5 are configured in the same manner as the first damper tube 81, except that they are positioned at a position rotated 120° in a plan view relative to the first damper tube 81.
Each of the damper tubes 81 to 83 of the fifth embodiment is formed in a bellows shape, similar to the damper tubes 41 and 42 of the third embodiment.

In the damper 71 of the fifth embodiment, a first elastic spring 86 as an example of a first elastic member is disposed at a position facing the first damper tube 81 across the movable carriage 72. One end of the first elastic spring 86 is supported by a side surface of the movable carriage 72, and the other end is supported by an inner circumferential surface of the damping section 84.
In addition, similar to the first elastic spring 86, a second elastic spring 87 as an example of a second elastic member and a third elastic spring 88 as an example of a third elastic member are arranged on the second damper tube 82 and the third damper tube 83, respectively.
Therefore, in the damper 71 of the fifth embodiment, the damper tubes 81 to 83 and the elastic springs 86 to 88 are alternately arranged along the circumferential direction on six side surfaces of the movable carriage 72 in the shape of a hexagonal prism.

(Function of Example 5)
In the damper 71 of the fifth embodiment having the above-mentioned configuration, when the movable carriage 72 (or an object to be vibration-damped supported on the upper surface of the movable carriage 72) moves (vibrates) in the horizontal direction, each of the damper tubes 81-83 receives a force that expands and contracts. Accordingly, the pressure oil in each of the damper tubes 81-83 moves between the damper tubes 81-83 through the flow path 84a. At this time, the cross-sectional area of the flow path 84a is formed smaller than the cross-sectional area of the internal space of each of the damper tubes 81-83, and this acts as a resistance to the expansion and contraction of each of the damper tubes 81-83 when the pressure oil tries to move. Therefore, the vibration of the movable carriage 72 is damped.
In addition, in the fifth embodiment, elastic springs 86 to 88 are disposed opposite the damper tubes 81 to 83. Therefore, the elastic forces of the elastic springs 86 to 88 can act as a resistance force against the movement of the movable carriage 72. Therefore, the vibration damping performance is improved compared to the case where the elastic springs 86 to 88 are not provided.

In particular, the damper tubes 81 to 83 exert a resistance force proportional to the acceleration during movement of the movable carriage 72, while the elastic springs 86 to 88 exert a resistance force (elastic force) proportional to the movement distance during movement of the movable carriage 72. Therefore, compared to a configuration in which a resistance force corresponding to only a single parameter (acceleration, movement distance) is exerted, the damper 71 of Example 5 exerts resistance forces corresponding to different parameters (acceleration, movement distance), and is expected to improve vibration control performance.
Furthermore, in the case where the position of the movable carriage 72 after vibration damping has moved from the central position of the damping section 84, the elastic springs 86 to 88 of the fifth embodiment can return it to the central position by the balanced forces of the three elastic springs 86 to 88. Therefore, if the movable carriage 72 is not returned to the central position after vibration damping, the damper tubes 81 to 83 remain in an extended or contracted state, and the expected vibration damping performance may not be exhibited at the next vibration damping. In contrast, in the fifth embodiment, the movable carriage 72 is returned to the central position after vibration damping, and a predetermined vibration damping performance can be exhibited at the next vibration damping, thereby enabling stable vibration damping performance to be exhibited.
Furthermore, as in the first to fourth embodiments, the elastic springs 86 to 88 are not essential components, and they can be omitted if there is no need to return the movable carriage 72 to the central position and the purpose is to absorb vibrations in the planar direction.

In the damper 71 of Example 5, the vibration damping range is the extension/contraction range of the damper tubes 81 to 83, compared to the conventional damper 01 which requires installation space approximately twice the vibration damping range, and it is therefore possible to reduce the size of the damper 71 overall.
In the fifth embodiment, the movable dolly 72 is shaped like a hexagonal prism, and three damper tubes 81 to 83 and three elastic springs 86 to 88 are provided, but the present invention is not limited to this. For example, the movable dolly 72 can be shaped like a square prism and have two pairs of damper tubes and elastic springs, or the movable dolly 72 can be shaped like an octagonal prism and have four pairs of damper tubes and elastic springs, etc. The outer shape of the movable dolly can be appropriately changed according to the design and specifications, and the number of damper tubes and elastic springs can be changed to two or less or four or more depending on the outer shape of the movable dolly.

(Example of change)
Although the embodiment of the present invention has been described above in detail, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention described in the claims. Modifications (H01) to (H02) of the present invention are exemplified below.
(H01) In the above embodiment, the damper tubes 11, 12, 11', 12', 41, 42, 61, 62, 81, 82, 83 are exemplified as bellows-shaped members, but are not limited thereto. For example, a spiral-type folding structure or an inverted spiral-type folding structure (see, for example, JP 2015-33772 A) can also be applied. Therefore, in the first and second embodiments, a curved spiral-type or inverted spiral-type folding structure can be used, and in the third to fifth embodiments, a cylindrical or rectangular tubular spiral-type or inverted spiral-type folding structure can be used.
(H02) In the above embodiment, the damper tubes 11, 12, 11', 12', 41, 42, 61, 62, 81, 82, 83 are cylindrical with the same shape at one end and the other end, but are not limited to this. For example, the damper tubes may be cylindrical with a larger cross-sectional area at the other end than at the one end, i.e., conical or pyramidal.

1, 1', 31, 51, 71... shock absorber,
2, 2', 32, 52, 72...first object,
3, 33, 53, 73... second object,
11, 11', 41, 61, 81...first stretchable portion,
12, 12', 42, 62, 82...second stretchable portion,
13, 43, 63, 84... attenuation portion,
13a...hole,
14...regulating member,
43a, 64, 84a...flow paths,
64a...first flow path portion,
64b...second flow path portion,
86...first elastic member,
87...Second elastic member.

Claims (7)

1. A shock absorber for shock absorbing between a first object and a second object, comprising:
a first expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and is configured to be expandable and contractable along an axial direction of the cylinder, one end of which is supported by the second object, and which is curved with respect to a straight line connecting the first object and the second object;
a second expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and is configured to be expandable and contractable along an axial direction of the cylinder, one end of which is supported by the second object, and which is curved with respect to a straight line connecting the first object and the second object;
a damping section having a hole having a cross-sectional area smaller than the cross-sectional area of the first telescopic section and the second telescopic section intersecting the axis of the tube, the damping section being supported by the first object and being disposed between the other end of the first telescopic section and the other end of the second telescopic section, and through which a fluid can move;
A shock absorber comprising: 1. A shock absorber for shock absorbing between a first object and a second object, comprising:
a first expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and that is configured to be expandable and contractable along an axial direction of the cylinder, and that has one end supported by the first object;
A second expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and is configured to be expandable and contractable along an axial direction of the cylinder, and is accommodated inside the first expandable portion;
a damping section having a flow path connecting an inside of the first telescopic section and an inside of the second telescopic section, the damping section being supported by the second object and having the other end of the first telescopic section and the other end of the second telescopic section supported thereon;
The flow path has a cross-sectional area smaller than the area of a cross section intersecting the axis of the tube of the first telescopic section and the second telescopic section;
A shock absorber comprising: 1. A shock absorber for shock absorbing between a first object and a second object, comprising:
a first expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and that is configured to be expandable and contractable along a first axial direction of the cylinder, and that has one end supported by the first object;
a second expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and is configured to be expandable and contractable along a second axial direction of the cylinder, one end of which is supported by the second object and is disposed such that the second axial direction extends in a direction intersecting the first axial direction;
a damping section having a flow path connecting an inside of the first telescopic section and an inside of the second telescopic section, the damping section being supported by the second object and having the other end of the first telescopic section and the other end of the second telescopic section supported thereon;
The flow path has a cross-sectional area smaller than the area of a cross section intersecting the axis of the tube of the first telescopic section and the second telescopic section;
A shock absorber comprising: A plurality of the second elastic portions;
The flow path includes a first flow path portion connected to the first expandable portion, and a second flow path portion branching from the first flow path portion and extending to each of the second expandable portions;
4. The shock absorber according to claim 3, further comprising: 1. A shock absorber for shock absorbing between a first object and a second object, comprising:
a first expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and that is configured to be expandable and contractable along a first axial direction of the cylinder, and that has one end supported by the first object;
a second expandable portion that is formed in a hollow cylindrical shape capable of accommodating a fluid therein and is configured to be expandable and contractable along a second axial direction of the cylinder, one end of which is supported by the first object and is disposed such that the second axial direction extends in a direction intersecting the first axial direction;
a damping section having a flow path connecting an inside of the first telescopic section and an inside of the second telescopic section, the damping section being supported by the second object and having the other end of the first telescopic section and the other end of the second telescopic section supported thereon;
The flow path has a cross-sectional area smaller than the area of a cross section intersecting the axis of the tube of the first telescopic section and the second telescopic section, and the flow path is formed by surrounding an outer surface of the first object;
A shock absorber comprising: a first elastic member that is arranged to face the first expandable portion across the first object along the first axial direction and is elastically deformable;
a second elastic member that is elastically deformable and is disposed opposite the second expandable portion with the first object interposed therebetween along the second axial direction;
The shock absorber according to claim 5, further comprising: The first stretchable portion has a bellows shape in which mountain folds and valley folds are alternately formed along the axial direction of the tube;
The second stretchable portion has a bellows shape in which mountain folds and valley folds are alternately formed along the axial direction of the tube;
a restricting member that is supported along an outer periphery of the mountain fold line when viewed from the outside and restricts outward expansion of the first stretchable portion and the second stretchable portion;
7. The shock absorber according to claim 1, further comprising:

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