JP2002181108A - Tension adjustment damper - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a cable frame optimally and inexpensively for use in constructing a cable dome or the like. SOLUTION: The cylinder body 1 is inserted into a cylinder body 1 connected to a fixed side, and has a distal end projecting from one end of the cylinder body 1 and a base end connected to an intermediate shaft portion of a rod body 2 projecting from the other end of the cylinder body 1. In a tension adjusting damper in which an extension-side oil chamber R1 and a contraction-side oil chamber R2 partitioned by a provided piston 3 in a cylinder body 1 communicate with each other via a damping valve V provided outside, a rod body 2 is provided. Makes the distal end side, which becomes a small diameter via the piston 3, exist in the extension-side oil chamber R 1, and this extension-side oil chamber R
1 is made larger in cross-sectional area than the contraction-side oil chamber R2, the tip protruding from one end of the cylinder body 1 is used as an input terminal for external force, while the base end side, which has a large diameter via the piston 3, is on the contraction side. The base end protruding from the other end of the cylinder body 1 is a free end while the contraction-side oil chamber R2 has a smaller cross-sectional area than the extension-side oil chamber R1 in the presence of the oil chamber R2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a tension adjusting damper for suppressing a fluctuation in tension in a cable serving as a tension member in a cable frame.

[0002]

2. Description of the Related Art In a cable frame, for example,
When constructing a cable dome, assuming that a plurality of pillars which are arranged in a loop and erected, a ring-shaped tension cable arranged on the inner peripheral side of the pillars is suspended. I have.

At this time, as shown in FIG. 7, a tension cable Tc is connected to a suspension cable C1 extending from the upper end of each of the columns P on the fixed side, and each of the columns is arranged so as to form a pair with the suspension cable C1. It is described that it is connected to a presser cable C2 extending from the lower side of P.

A tension adjustment damper D is provided between each column P and the suspension cable C1 and the holding cable C2, and the cables C1 and C2 are constantly tensioned by the contraction force of the tension adjustment damper D. And

On the other hand, for example, as disclosed in Japanese Patent Application Laid-Open No. 10-317731, this tension adjusting damper D is set to a single rod type as shown in FIG. While the cables C1 and C2 tend to contract due to the tendency to contract, the oil in the pressure chamber R flows into the accumulator A via the damping valve V during the extension operation.

Therefore, in the tension adjusting damper D, even if energy can be absorbed during the extension operation, energy cannot be absorbed during the contraction operation.
Abrupt changes in tension that may occur in the cables C1 and C2 during the contraction operation cannot be suppressed.

As a result, in the cable frame using the tension adjusting damper D, the cables C1 and C2 are so thick that the cables C1 and C2 can withstand a sudden change in tension. Therefore, the roof load is increased, and it is required to form the pillars P so as to be robust. As a result, the construction of a cable dome or the like using a cable frame is expensive. There is a problem to do.

The present invention has been made in view of the above-mentioned circumstances, and has as its object to prevent a cable frame, for example, a cable dome or the like, from being used without causing an unnecessary increase in construction cost. Focusing on providing a tension adjustment damper that is optimal for use in construction, in which case it is possible to provide a tension adjustment damper at low cost, and it is optimal to expect improvement in its versatility Is to do so.

[0009]

In order to achieve the above-mentioned object, according to a first aspect of the present invention, there is provided a tension adjusting damper comprising: a cylinder body connected to a fixed side such as a column; A rod body whose base end protrudes from the other end of the cylinder body while its distal end protrudes from one end of the cylinder body, and which is slidably housed in the cylinder body while being connected to this rod body and A piston for partitioning the expansion-side oil chamber and the compression-side oil chamber, wherein the expansion-side oil chamber and the compression-side oil chamber are connected to each other via a damping valve disposed outside the cylinder body, and are also connected to the outside. In the tension adjusting damper communicated with the existing accumulator, the rod body has the distal end side having a small diameter with the piston as a boundary, and the extension side oil chamber is located in the extension side oil chamber. big While the tip is used as the input end of the external force while making the cross-sectional area, the base end side, which has a large diameter with the piston as a boundary, is located in the contraction side oil chamber, so that the contraction side oil chamber is compared with the extension side oil chamber. The base end is assumed to be a free end while having a small cross-sectional area.

According to the second means, a cylinder body connected to a fixed side such as a pillar, and a base end protruding from the other end of the cylinder body while being inserted into the cylinder body and projecting at one end from one end of the cylinder body A piston body that is slidably housed in the cylinder body while being connected to the rod body, and that defines a stretch-side oil chamber and a contraction-side oil chamber in the cylinder body. In a tension adjusting damper in which the contraction side oil chamber is communicated with an accumulator also arranged outside while being connected to each other through a damping valve arranged outside the cylinder body, the rod body has a small diameter with the piston as a boundary. The extension side oil chamber has a larger cross-sectional area than the contraction side oil chamber by making the leading end side exist in the extension side oil chamber, and the base end side, which has a large diameter from the piston, becomes the compression side oil chamber. Resident in the room This allows the contraction-side oil chamber to have a smaller cross-sectional area than the extension-side oil chamber, while allowing the base end of the rod to pass through the extension cylinder portion extending to the other end of the cylinder, and The base end of the rod is a free end protruding from the other end of the extension cylinder to the outside. A sub-cylinder is formed in the base end of the rod body, and a sub-piston is slidably mounted in the sub-cylinder. The partitioned sub oil chamber is communicated with a sub accumulator disposed outside the cylinder body through the extension cylinder part, and the rod is inserted through the shaft core of the rod body while the base end is connected to the sub piston. It is assumed that the tip of the sub-rod projecting from the tip of the body to the outside is the input end of the external force.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on the illustrated embodiment. The tension adjusting damper D1 according to the embodiment shown in FIG. 1 is a substitute for the tension adjusting damper D shown in FIG. The tension cable Tc is also used as a tension cable Tc shown in FIG.
It comprises a cylinder body 1, a rod body 2, and a piston 3.

The cylinder body 1 is connected to a fixed side such as a column P (see FIG. 7). In the illustrated embodiment, a mount M having damping valves V described later is connected to a so-called outer periphery. I have.

The rod body 2 is inserted into the above-mentioned cylinder body 1 so that the distal end, which is the left end in the figure, protrudes from one end, which is the left end in the figure, and the base end, which is the right end in the figure. Protrudes from the other end, which is the right end in the figure of the cylinder body 1.

At this time, the rod body 2 has a diameter φ1 on the distal end side 2a on the left side in the figure with respect to the piston 3, and a diameter φ2 on the right end side 2b in the figure with the piston 3 as the boundary. Is different from that shown in FIG.
Is smaller than the diameter φ2 of the base end 2b, that is, φ1 <φ2.

As a result, the expansion-side oil chamber R1 defined by the piston 3 described later in the cylinder body 1 has a compression-side oil chamber R2 defined by the piston 3 in the cylinder body 1 having the opposite cross-sectional area. Larger than the cross-sectional area.

In the rod 2, the distal end is used as an input terminal for external force, that is, the input terminal for tension acting via the suspension cable C1 which is the tension member connected to the distal end. , The other end is a free end on which no external force acts.

The piston 3 is slidably housed in the cylinder body 1 while being connected to the intermediate shaft portion of the rod body 2.
The extension-side oil chamber R1 and the contraction-side oil chamber R2 are defined in the cylinder body 1.

The expansion-side oil chamber R1 and the contraction-side oil chamber R2 are connected to each other via a damping valve V provided outside the cylinder body 1 and connected to an accumulator A also provided outside. It is said that it will be communicated.

In the illustrated embodiment, the damping valve V is set to a so-called fixed type in which the magnitude of the generated damping force is constant, and is mounted integrally on the so-called outer periphery of the cylinder body 1. It is described that the battery is housed in M in parallel with the check valve C.

At this time, the check valve C is connected to the extension-side oil chamber R
1 and the so-called outflow of oil from the contraction-side oil chamber R2 to the outside, while the extension-side oil chamber R1 from the outside is prevented.
And it is set so that the inflow of oil toward the contraction side oil chamber R2 is permitted.

As described above, since the damping valve V and the check valve C are disposed in the mount M connected to the cylinder body 1, the damping valves V are connected to the cylinder body 1 via the pipe. This is advantageous in that the overall size can be reduced without complicating the appearance and the structure as compared with the case where it is connected.

The damping valve V is not limited to the above-mentioned fixed type, but may be set to a variable type (not shown) capable of adjusting the generated damping force. The good thing is, of course.

Although not shown, the accumulator A has a gas chamber filled with an expanding and contracting gas pressure partitioned by an elastic film such as a bellows, a damping valve V and a check valve C.
And an oil chamber that communicates with the expansion-side oil chamber R1 and the compression-side oil chamber R2 through the oil-cooling chamber R2. However, in this embodiment, it is described that a spring force for constantly urging the tension adjustment damper D1 in the contraction direction is exhibited.

As described above, in the tension adjusting damper D1 according to this embodiment, when the rod body 2 is extended and retracted with respect to the cylinder body 1 during so-called expansion and contraction, the expansion-side oil chamber R1 and the contraction-side oil chamber R2 are connected. The oil reciprocates between the two, and at this time, since the oil passes through the damping valve V, a predetermined damping action, that is, energy absorption is realized in any direction of expansion and contraction.

In the tension adjusting damper D1, when the distal end side 2a of the rod body 2 comes out of the cylinder body 1, it flows out of the extension side oil chamber R1 contracted by sliding of the piston 3. All of the oil cannot flow into the compression-side oil chamber R2 that expands due to the sliding of the piston 3, and a part of the oil flows into the accumulator A. Therefore, at this time, the oil contracts in the gas chamber in the accumulator A. The spring force will be exerted.

That is, when an external force acts on the rod body 2 through the suspension cable C1, which is a tension member, connected to the tip of the rod body 2, the rod body 2 contracts when it comes out of the cylinder body 1. The oil flowing out from the expansion-side oil chamber R1 flows into the compression-side oil chamber R2 via the damping valve V, and a part of the oil flows into the accumulator A.

As a result, a predetermined energy absorption is realized by the damping action by the oil passing through the damping valve V and the spring effect by the oil flowing into the accumulator A, and the rod body 2 , That is, the tension acting on the suspension cable C1.

Conversely, when the external force acting on the suspension cable C1 decreases, the oil from the accumulator A in the tension adjusting damper D1 has a large cross-sectional area. And the oil from the contraction-side oil chamber R2 having a small cross-sectional area flows into the extension-side oil chamber R1 via the damping valve V, and the tension adjustment damper D
1 will shrink.

Therefore, the slack of the suspension cable C1 is prevented by the contraction of the tension adjustment damper D1, while
The predetermined energy absorption is embodied by the damping effect of the oil passing through the damping valve V, and the suspension cable C1 is further spring-loaded by the accumulator A.
Can be suppressed.

The above state, that is, the tension adjusting damper D
When observing the characteristic of the load change with respect to the stretching stroke of No. 1, as shown in FIG. 2, when the bending point is in the neutral state shown in FIG. 1, the load changes at a large angle when the tension adjustment damper D1 extends. On the other hand, when the tension adjusting damper D1 contracts, the load changes at a small angle.

Incidentally, the connection of the tension adjusting damper D1 to the column P is not shown in FIG.
Is fully slid in the cylinder body 1 to the other end side of the cylinder body 1 and connects the cylinder body 1 to the column P while in the so-called most contracted state, and then a hanging cable is attached to the tip of the rod body 2. It is preferable that the rods 2 are pulled out from the cylinder body 1 to be in a moderately elongated state (neutral state) as shown in FIG.

In place of the above-described connecting method, the tension adjusting damper D1 is brought into the most extended state without load pressure, and in this state, the cylinder body 1 is connected to the column P while the rod body 2 is connected. The suspension cable C1 is connected to the end of the cable and pressurized into the tension adjusting damper D1 to shrink it.
Thereby, tension may be applied to the suspension cable C1.

Next, the tension adjusting damper D2 of the embodiment shown in FIG. 3 is a conventional tension adjusting damper D shown in FIG. 7, that is, a holding cable which is a tensioning member connected to the tension cable Tc shown in FIG. This is an alternative to the tension adjusting damper D that suppresses the tension fluctuation in C2.

Therefore, the tension adjusting damper D2 has basically the same configuration as the tension adjusting damper D1 shown in FIG. 1 described above. Except where necessary, only the same reference numerals will be given in the figures, and detailed descriptions thereof will be omitted.
The following description focuses on features of the tension adjustment damper D2.

That is, in the tension adjusting damper D2, the base end 2b of the rod 2 is inserted through the extension cylinder portion 1a extending to the other end of the cylinder 1, and the base 2 Is a free end protruding outside from the other end of the extension cylinder portion 1a.

In the tension adjusting damper D2, a sub-cylinder 4 is formed in the base end of the rod body 2 and is divided by a sub-piston 5 slidably accommodated in the sub-cylinder 4. The sub oil chamber R3 communicates with the sub accumulator A1 disposed outside the cylinder body 1 via the inside of the extension cylinder portion 1a.

At this time, the sectional area of the sub oil chamber R3 is changed from the sectional area of the extension oil chamber R1 to the contraction oil chamber R2.
Is set to be smaller than the value obtained by subtracting the cross-sectional area of the sub-accumulator A, and the gas pressure filled in the gas chamber in the accumulator A1 is larger than the gas pressure filled in the gas chamber (not shown) in the sub-accumulator A1. It is going to be set to.

As a result, the thrust acting on the rod body 2 becomes larger than the thrust acting on the sub-piston 5. That is, the cross-sectional area in the expansion-side oil chamber R1 is changed from the cross-sectional area in the contraction-side oil chamber R2. The value obtained by multiplying the subtracted value by the gas pressure charged in the accumulator A is the sub oil chamber R3.
Is larger than the value obtained by multiplying the cross-sectional area by the gas pressure filled in the sub-accumulator A1, and this becomes necessary and sufficient.

Therefore, even if the sectional area in the sub oil chamber R3 becomes larger than the value obtained by subtracting the sectional area in the contracting oil chamber R2 from the sectional area in the extending oil chamber R1, the sub accumulator may be replaced. By sufficiently reducing the filling gas pressure in A1, as a result,
The thrust acting on the sub-piston 5 may be made smaller toward the thrust acting on the rod body 2.

Even if the gas pressure in the accumulator A becomes smaller than the gas pressure in the sub-accumulator A1, the value obtained by subtracting the cross-sectional area in the compression-side oil chamber R2 from the cross-sectional area in the expansion-side oil chamber R1 is equal to the value of the sub-piston 5. May be set to be sufficiently larger than the pressure receiving area.

In the tension adjusting damper D2, a sub-rod projecting from the distal end of the rod body 2 to the outside through the shaft core of the rod body 2 while its base end is connected to the sub-piston 5 described above. It is assumed that the tip of the body 6 serves as an input end of an external force by connecting the holding cable C2 which is a tension body.

Therefore, in this tension adjusting damper D2, when an external tension acts on the sub-rod body 6 via the holding cable C2, the sub-rod body 6 moves from the so-called neutral state shown in FIG. From the sub piston 5 as shown in FIG.
Slides in the sub-cylinder 4 to the so-called extension side, and the extension operation is performed.

As a result, the oil in the sub oil chamber R3 (see FIG. 3) is supplied to the sub accumulator A via the extension cylinder portion 1a.
1 and at this time, the spring force by the sub-accumulator A1 is exerted.

When the sliding of the sub-piston 5 in the sub-cylinder 4 is stopped by so-called extension, it is through the sub-piston 5 but the sub-rod body 6
An external force acts on the rod body 2 so that the rod body 2 comes out of the cylinder body 1 as shown in FIG.

As a result, the oil flowing out of the contracted expansion-side oil chamber R1 flows into the contraction-side oil chamber R2 via the damping valve V, similarly to the case where the tension adjusting damper D1 shown in FIG. At the same time, some oil flows into the accumulator A.

The predetermined energy absorption is realized by the damping effect of the oil passing through the damping valve V and the spring effect of the oil flowing into the accumulator A, and acts on the rod 2. In other words, the tension acting on the presser cable C2.

When the external force acting on the holding cable C2 decreases from the time when the tension adjusting damper D2 is in the above-described most extended state, the contraction operation is performed in a system opposite to that described above.

That is, first, the oil from the accumulator A flows into the expansion-side oil chamber R1 having a large sectional area,
The oil from the compression-side oil chamber R2 having a small cross-sectional area is supplied to the damping valve V
Flows into the extension-side oil chamber R1 via.

At this time, the tension adjusting damper D2 contracts while preventing the holding cable C2 from loosening. However, a predetermined energy absorption is realized by the damping effect of the oil passing through the damping valve V. ,Moreover,
The spring force by the accumulator A suppresses the tension fluctuation in the holding cable C2.

From the above, when observing the characteristics of the load change with respect to the expansion / contraction stroke of the tension adjusting damper D2,
As shown in FIG. 6, when the left bending point is in the neutral state shown in FIG. 3, when the sub-rod body 6 moves in the rod body 2, the load changes at a large angle.

When the movement of the sub rod body 6 in the rod body 2 is stopped and the rod body 2 moves in the cylinder body 1, the load changes at a small angle from the right bending point in FIG. You will be in a state to do.

When the sub-piston 5 further moves in the sub-cylinder 4 from the neutral state shown in FIG. 3 to the so-called maximum compression state, the load changes at a small angle from the left bending point in FIG. become.

The connection of the tension adjusting damper D2 to the column P is not shown, but the piston 3 is fully slid in the cylinder body 1 to the other end of the cylinder body 1 while the sub-piston 5 is flowing. Is fully slid in the sub-cylinder 4 to the other end of the sub-cylinder 4 and connects the cylinder body 1 to the column P while being in the so-called most contracted state. By connecting C1, FIG.
As shown in (1), the sub-rod body 6 is pulled out from the rod body 2, and the rod body 2 is pulled out from the cylinder body 1 to be in a state of being extended to a middle degree (neutral state).

In the tension adjusting damper D2, when the rod body 2 contracts from the extended state, the rod body 2 enters the cylinder body 1, and if the rod body 2 cannot be further retracted. Then, the sub rod body 6 is immersed in the rod body 2.

Therefore, in the tension adjusting damper D1 shown in FIG. 1 described above, after the rod body 2 is completely immersed in the cylinder body 1 during the contracting operation, the tension adjusting damper D1 does not contract further. In the tension adjusting damper D2 shown in FIG. 3, further contraction operation after the rod body 2 has been completely immersed in the cylinder body 1 becomes possible.

[0056]

As described above, according to the present invention, the oil always passes through the damping valve during the expansion and contraction operation.
When the extension operation is performed, the spring effect by the accumulator can be expected, so that the tension fluctuation in the tension member made of the cable can be effectively suppressed. Therefore, for example, when a cable dome or the like is constructed with a cable frame. In addition, it is not necessary to set the tension member so as to be thick, so that it is not required to increase the roof load or to form the column firmly, thereby enabling cost reduction.

According to the present invention, a sub-piston slidably housed in a base end portion of a rod body protruding outside the cylinder body to define a sub-oil chamber, and a base end of the sub-piston is provided. A sub-rod body which is continuously provided and whose tip projects outside from the tip of the rod body, wherein the sub-oil chamber is communicated with a sub-accumulator disposed outside the cylinder body, and a tension member is provided at a base end of the sub-rod body. If the tension member is further retracted after the rod body has been retracted into the cylinder body during the contraction operation, the sub rod body will be retracted into the rod body, and the damping valve In addition to the generation of the damping force, the fluctuation of the tension in the tension member can be effectively suppressed by the spring force of the sub-accumulator.

Further, since the damping valve and the check valve are arranged in a mount connected to the cylinder body, the damping valves and the check valve are compared with a case where the damping valves are connected to the cylinder body via a pipe. This is advantageous in that the overall size can be reduced without complicating the appearance and the structure.

As a result, according to the present invention, it is possible to provide a tension adjusting damper which is most suitable for use in constructing a cable frame, for example, a cable dome, without causing an unnecessary increase in construction cost. In this case, there is an advantage that the tension adjusting damper can be provided at a low cost, and the versatility can be expected to be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing in principle a tension adjusting damper according to an embodiment of the present invention.

FIG. 2 is a diagram showing stroke-load characteristics in the tension adjusting damper of FIG.

FIG. 3 is a view showing a tension adjusting damper according to another embodiment, similarly to FIG. 1;

FIG. 4 is a view showing a state in which the tension adjusting damper of FIG. 3 is slightly extended, similarly to FIG. 1;

FIG. 5 is a view showing a state in which the tension adjusting damper of FIG. 3 is further extended, similarly to FIG. 1;

FIG. 6 is a diagram showing stroke-load characteristics in the tension adjusting damper of FIG. 3;

FIG. 7 is a partial view showing an example of a cable frame in principle.

FIG. 8 is a diagram showing in principle the tension adjusting damper as a conventional example shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder body 1a Extension cylinder part 2 Rod body 2a Distal side 2b Proximal side 3 Piston 4 Subcylinder 5 Subpiston 6 Subrod body A Accumulator A1 Subaccumulator C Check valve C1 Tension body suspension cable C2 Tension body holding cable D1, D2 Tension adjustment damper R1 Extension oil chamber R2 Contraction oil chamber R3 Sub oil chamber Tc Tension cable V Damping valve φ1 Diameter at rod tip end φ2 Diameter at rod end rear end

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) F16F 9/32 H (72) Inventor Manabu Nakahara 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Kogyo Co., Ltd. (72) Inventor Kozo Fukao 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Hayao Aoyagi 8-21 Ginza, Chuo-ku, Tokyo # 1 Inside Takenaka Corporation Tokyo Main Store 1-5-1 Otsuka Corporation Takenaka Corporation Technical Research Institute Co., Ltd. (72) Inventor Oka Hideo 1-5-1 Otsuka, Inzai City, Chiba Pref. None (reference) 3J048 AA04 AB01 AC04 BE03 EA38 3J069 AA55 AA56 AA57 AA58 AA64 CC09 CC15 CC33 EE11

Claims (2)

[Claims] 1. A cylinder body connected to a fixed side such as a column, a rod body inserted into the cylinder body and having a base end projecting from the other end of the cylinder body while a tip end projects from one end of the cylinder body. A piston that is slidably housed in the cylinder body while being connected to the rod body and has a piston that separates the extension-side oil chamber and the contraction-side oil chamber in the cylinder body, wherein the extension-side oil chamber and the contraction-side oil chamber are cylinders; In a tension adjustment damper that is connected to an accumulator that is also located outside while being connected to each other through a damping valve that is located outside the body, the distal end side where the rod body has a small diameter with the piston as the boundary is extended side While the extension side oil chamber has a larger cross-sectional area compared to the contraction side oil chamber by being present in the oil chamber, the distal end is used as an input end of external force, while the base end side, which becomes larger in diameter with the piston, is Coming to the compression side oil chamber A tension adjusting damper characterized in that the compression-side oil chamber has a smaller cross-sectional area than the extension-side oil chamber while the base end is a free end. 2. A cylinder body connected to a fixed side such as a column, a rod body inserted into the cylinder body and having a proximal end projecting from the other end of the cylinder body while a distal end projects from one end of the cylinder body. A piston that is slidably housed in the cylinder body while being connected to the rod body and has a piston that separates the extension-side oil chamber and the contraction-side oil chamber into the cylinder body; In a tension adjustment damper that is connected to an accumulator that is also located outside while being connected to each other through a damping valve that is located outside the body, the distal end side where the rod body has a small diameter with the piston as the boundary is extended side The expansion side oil chamber has a larger cross-sectional area than the contraction side oil chamber by being present in the oil chamber, and the base end side, which has a large diameter from the piston, is present in the compression side oil chamber. This contraction side oil chamber Has a smaller cross-sectional area than the extension-side oil chamber, while the base end of the rod body is inserted through an extension cylinder portion extending to the other end of the cylinder body, and the base end of the rod body is A sub-cylinder is formed in the base end of the rod body, and a sub-oil chamber defined by a sub-piston slidably accommodated in the sub-cylinder is extended. The cylinder is communicated with a sub-accumulator disposed outside the cylinder body through the cylinder part, and the base end is inserted into the shaft core of the rod body while being connected to the sub-piston to protrude from the distal end of the rod body to the outside. A tension adjusting damper characterized in that the tip of the sub-rod is used as an input end for external force.