JP6148030B2 - Shock absorber and construction machine tank support structure using the same - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a shock absorber and a construction machine tank support structure using the same, and more particularly to a fluid tank support structure in a construction machine such as a hydraulic excavator, a super large dump truck, a crane, and a shock absorber used therefor. It is. As a fluid tank, various things, such as a fuel tank, an oil tank, or a cooling water tank, are mentioned.

Conventionally, as a construction machine tank support structure such as a hydraulic excavator or a transport vehicle, as shown in Patent Document 1 and Patent Document 2, a structure that directly supports a floor or a frame is employed. In the construction machine disclosed in Patent Document 1, the hydraulic oil tank (12) is directly mounted and supported on the pair of pipe members on the frame side, and the fuel tank (13) is directly mounted and supported on the revolving frame.
Also, in the construction machine disclosed in Patent Document 2, the fuel tank (11) is directly mounted on and supported by the revolving frame.

Construction machines such as hydraulic excavators are often used under harsh conditions such as mudlands, wastelands and slopes in suburbs and mountain forests as well as building construction sites in the city. For example, in undulating or uneven ground conditions such as landslide disaster sites and sabo dam construction sites, vibrations caused by excavator work, rolling and pitching of the fuselage are repeated, and it is a heavy object filled with fuel and hydraulic oil Since various tanks have high inertia, considerable stress acts on the support portions.
Therefore, in some cases, there is a risk that the support portion that supports the tank may be damaged, or the mounting bolt may be bent.

Therefore, in order to solve the above-described inconvenience, there has appeared a device in which means for using an elastic material is used for the support portion of the tank. For example, the construction machine disclosed in Patent Document 3 employs a structure in which a vertically long fuel tank (34) is supported on a swivel base via a rubber vibration-proof plate (44) that is a shock absorber. Yes.
By adopting such an elastic support structure, it is possible to withstand significant changes in the aircraft's behavior (moment of inertia) and to support the tank well without causing any inconvenience such as damage to the support. It seemed to be possible.

JP 2007-217922 A JP 2011-042994 A JP 2010-071005 A

  However, in the construction machine having the elastic support structure of the tank as described above, there have been problems afterwards. For example, in the construction machine of Patent Document 3, it has been found that the load transmission member (48) that supports the upper part of the vertically elongated fuel tank (34) may be damaged such as cracks. As described above, in a model equipped with a large-capacity tank that becomes heavy or a model that is repeatedly used under severe working conditions, there is still a possibility that a problem occurs in the support portion of the tank.

  The purpose of the present invention is to improve the fluid tank support structure for construction machinery and the shock absorbers used in the construction to those with sufficient elastic support function and sufficient strength by further contrivance, and tough work such that the aircraft is swung around It exists in the point provided as a suitable thing for the support part of the fluid tank in a construction machine with conditions.

The invention according to claim 1 is a shock absorber,
Any one of a supported portion 7 fixed to the fluid tank 6 and a support portion 8 on the airframe side for supporting the fluid tank 6;
A flange 11 fixed to one of the supported portion 7 and the support portion 8 via a cylindrical portion 10 that is inserted in a support hole h formed in any one 8 so as to be relatively movable; Between the upper and lower sides of the first elastic portion 12 deployed in a state of surrounding the cylindrical portion 10;
Between the upper and lower sides of either one of the other 7 and the one of the 8 has a second elastic portion 9 provided in a state of surrounding the cylindrical portion 10,
The first elastic part 12 and the second elastic part 9 are configured by integrating an elastic member 14 and a hard plate 15 ,
The inner diameter of each of the first elastic part 12 and the second elastic part 9 is set to be somewhat larger than the outer diameter of the cylindrical part 10 .

The invention according to claim 2 is the shock absorber according to claim 1,
In addition to the first and second elastic portions 12 and 9, the cylindrical tubular portion 10 fitted into the support hole h having a circular shape is included.
The outer peripheral surface 10 </ b> A of the cylindrical portion 10 is equipped with low friction means B that promotes sliding with any one of the above 8.

The invention according to claim 3 is the shock absorber according to claim 1 or 2,
The first elastic portion 12 and the second elastic portion 9 are configured to be the same as each other.

The invention according to claim 4 is the shock absorber according to claim 1 or 2,
The flange 11 is integrally provided on the end surface of the first elastic portion 12 on the side where the hard plate 15 is not provided in the elastic member 14.

The invention according to claim 5 is the shock absorber according to any one of claims 1 to 4,
In the assembled state in which the flange 11 and the tubular portion 10 are in contact with each other, and the tubular portion 10 is in contact with the other one 7 and the three members 11, 10, 7 are relatively fixed. Is configured to be in a pre-compressed state in which the thickness of the first and second elastic portions 12, 9 is reduced by a predetermined amount.

  The invention according to claim 6 is characterized in that, in the shock absorber according to any one of claims 1 to 5, the elastic member is formed of a high damping rubber.

The invention according to claim 7 is the construction machine tank support structure,
One of the supported portion 7 fixed to the fluid tank 6 and the support portion 8 on the airframe side that supports the fluid tank 6, and the other of the supported portion 7 and the supporting portion 8, The second elastic part 9 is interposed between the upper and lower sides of
The cylindrical portion 10 in a state where the upper end is in contact with either one of the other holes 7 is inserted into the support hole h formed in any one 8 so as to be relatively movable,
The first elastic portion 12 is interposed between the flange 11 in a state of being in contact with the lower end of the cylindrical portion 10 or the flange 11 in a state of being integrally formed with the lower end of the cylindrical portion 10 and the one 8. Dress
A configuration in which an assembly state in which the flange 11 and the other one 7 are integrated via the cylindrical portion 10 can be formed by the bolt means 13 provided in a state of being inserted into the cylindrical portion 10. As
The first elastic portion 12 and the second elastic portion 9 are configured by integrating an elastic member 14 that surrounds the cylindrical portion 10 and a hard plate 15 that surrounds the cylindrical portion 10. It is,
The inner diameter of each of the first elastic part 12 and the second elastic part 9 is set to be somewhat larger than the outer diameter of the cylindrical part 10 .

The invention according to claim 8 is the construction equipment tank support structure according to claim 7,
The outer peripheral surface 10A of the cylindrical cylindrical portion 10 and / or the one inner peripheral surface that forms the circular support hole h is promoted to slide between the cylindrical portion 10 and the one 8. Low friction means B is provided.

  The invention according to claim 9 is the construction machine tank support structure according to claim 7 or 8, wherein the first elastic portion 12 and the second elastic portion 9 are configured to be the same. It is a feature.

The invention according to claim 10 is the construction machine tank support structure according to claim 7 or 8,
The flange 11 is in contact with the lower end of the cylindrical portion 10, and the flange 11 is integrated with the end surface of the first elastic portion 12 on the side not equipped with the hard plate 15. It is equipped with.

The invention according to claim 11 is the tank support structure for construction equipment according to any one of claims 7 to 10,
The thicknesses of the first and second elastic portions 12 and 9 are both set to a state in which the thickness in the assembled state is smaller by a predetermined amount than the thickness in the free state. is there.

  According to a twelfth aspect of the present invention, in the construction machine tank support structure according to any one of the seventh to eleventh aspects, the elastic member is formed of a high damping rubber.

  According to the first aspect of the present invention, the load of the fluid tank can be supported and vibration-proof and supported by one of the first and second elastic portions, and the other of the first and second elastic portions. Thus, it is possible to perform a buffering action and an anti-vibration action against the force that the fluid tank attempts to move upward. This makes it possible to provide vibration isolation and shock-absorbing support for the fluid tank during normal traveling and work, as well as traveling on rough roads with severe irregularities and undulations, and during hard work involving intense vertical movement and vibration of the aircraft. Anti-vibration and shock-absorbing action can be provided against inertial movement and impact movement upward of the fluid tank.

Since each elastic part is configured by integrating an elastic member and a hard plate, the elastic deformation when strongly compressed is suppressed by the hard plate as compared to the case where only the elastic member is configured, and the elastic member It is possible to obtain advantages such as being able to withstand high loads and improving durability for the spring constant of.
In addition, if the vertical dimension between the supported part and the support part is changed without changing the anti-vibration function or buffer function of the fluid tank due to specification changes, etc., the elastic member can be changed by changing the thickness of the hard plate. It is possible to take a reasonable measure of keeping the thickness of the film as it is, and there is an advantage that the design is flexible.

  According to the second aspect of the present invention, when a lateral force acts on the shock absorber, or when a movement in which the fluid tank and the support portion rotate relatively acts, the cylindrical portion and the support portion The frictional resistance due to the contact is reduced, and the buffer tank performance and vibration isolation performance of the fluid tank are improved. In addition, the adoption of the low friction means has an advantage that the relative vertical movement between the cylindrical portion and the support portion becomes smooth, and the load can be more borne on the shock absorber.

  According to the invention of claim 3, since the first elastic part and the second elastic part are the same as each other, an assembly error does not occur, and the number of parts is reduced and parts management is simplified. There is also an advantage that becomes possible.

  According to the invention of claim 4, since the flange is equipped in an integrated state with the first elastic portion, the assembly work can be carried out more easily and more easily compared with the case where it is equipped as a separate body. There is also an advantage that the risk of loss during assembly and disassembly is greatly reduced.

  According to the invention of claim 5, since the first and second elastic parts are assembled in a state of being pre-compressed up and down, loosening of the bolt means with time is eliminated or suppressed, and it can be mounted without rattling, or a heavy fluid There is an effect that the tank can be stably supported.

  According to the sixth aspect of the present invention, since the elastic member that is subjected to the load is made of high-damping rubber, there is an effect that the shock absorption can be further improved.

  According to the seventh aspect of the present invention, there can be provided a construction machine tank support structure that has the same operational effects as the first aspect of the present invention. The eighth aspect of the invention is the second aspect, the ninth aspect is the third aspect, the tenth aspect is the fourth aspect, the eleventh aspect is the fifth aspect, and the twelfth aspect is the sixth aspect. It is possible to provide a construction machine tank support structure that exhibits the same operational effects.

Partially cutaway side view of the main part showing the fuel tank support structure (Embodiment 1) Partially cutaway side view showing the state when the fuel tank support structure is not tightened The arrangement structure of the buffer for supporting the tank is shown, (a) is a plan view, and (b) is a side view. Schematic diagram showing the fuel tank position of a hydraulic excavator The 1st elastic part is shown, (a) is a top view, (b) is a sectional view. The 2nd elastic part is shown, (a) is a top view, (b) is a sectional view. The partially cutaway side view of the principal part which shows the fuel tank support structure by Embodiment 2 The manufacturing method of each elastic part is shown, (a) is the first elastic part, (b) is the second elastic part. The structure of each elastic part is shown, (a) is the first elastic part, (b) is the second elastic part. The fuel tank support structure 1st another embodiment is shown, (a) is a partially cutaway side view of the principal part, (b) is a sectional view taken along line XX of (a). The other another embodiment of a fuel tank support structure is shown, (a) is a partially notched side view of 2nd another embodiment, (b) is a partially notched side view of 3rd another embodiment.

  Embodiments of a shock absorber according to the present invention and a tank support structure for a construction machine using the same will be described below with reference to the drawings. A machine body in a construction machine such as a hydraulic excavator, a transporter, or a bulldozer may be expressed as a “vehicle body”.

Embodiment 1
1 and 3 show a construction machine tank support structure (hereinafter abbreviated as “tank support structure”) and a shock absorber A used therefor. For example, as shown in FIG. 4, the tank support structure includes a hydraulic working device 1, a crawler traveling device 2, a swivel base 3 that is an airframe, an operation cabin 4, a driving unit 5 that is configured on the swivel stand 3, and the like. In the hydraulic excavator (an example of a construction machine) K, a structure for supporting a fuel tank (an example of a fluid tank) 6 provided in the prime mover 5 is exemplified.
As shown in FIG. 3, the fuel tank 6 is mounted and supported on the swivel base 3 in an elastically supported state by a total of six tank support structures (buffers A) at three positions on each of the support frames 8 and 8.

1 and 3, the tank support structure is configured as follows. A support frame (an example of a body-side support part) 8 fixed to the swivel base 3 to support the fuel tank 6 and a downward convex tank stay (an example of a supported part) fixed to the lower surface 6a of the fuel tank 6 A second elastic portion 9 is interposed between the upper and lower portions of the second elastic portion 9.
A boss (an example of a cylindrical portion) 10 in a state where the upper end 10a is in contact with the tank stay 7 is inserted into a vertical support hole 8c (support hole h) formed in the support frame 8, and the lower end 10b of the boss 10 is disposed. A first elastic portion 12 is interposed between the upper and lower sides of the flange 11 in contact with the support frame 8. The boss 10 is a cylindrical member made of metal, for example.

The bolt means 13 provided in a state of being inserted into the boss 10 is configured so that an assembled state in which the flange 11 and the tank stay 7 are integrated via the boss 10 can be formed. The bolt means 13 includes a bolt 13A, a nut 13B, and a washer 13C.
The second elastic portion 9 is configured by integrating a ring-shaped elastic member 14 and a ring-shaped hard plate 15, and the first elastic portion 12 is formed of the ring-shaped elastic member 14 and the ring-shaped hard plate 15. And the flange 11 are integrated.

The tank stay 7 is made of, for example, a steel plate press, and has a pair of attachment portions 7a and 7a welded to the lower surface 6a of the fuel tank 6, a pair of leg portions 7b and 7b that are inclined legs, and each leg portion 7b, And a horizontal mounting portion 7c straddling 7b. The mounting portion 7c is formed with a hole 7d for allowing the bolt 13A to pass therethrough.
The support frame 8 includes, for example, a steel plate channel material having a pair of left and right vertical wall portions 8a and 8a and a horizontal horizontal wall portion 8b and having a U-shaped cross section. A circular support hole 8c for tightly fitting the boss 10 is formed in the lateral wall portion 8b.

As shown in FIGS. 1 and 6, the second elastic portion 9 includes a flat cylindrical elastic member 14 made of rubber and a hard plate 15 made of a steel plate and having a circular ring shape. As shown in FIG. 8B, the elastic member 14 and the hard plate 15 are integrated by vulcanization adhesion by vulcanization of the elastic member 14.
The inner diameter of the elastic member 14 is set to a value slightly larger than the outer diameter of the boss 10, and the inner diameter of the hard plate 15 is matched with the inner diameter. Further, the outer diameter of the hard plate 15 is set to an eye value larger than the outer diameter of the elastic member 14.
The elastic member 14 and the hard plate 15 in the second elastic portion 9 are the same as the elastic member 14 and the hard plate 15 of the first elastic portion 12 described later, but are different from each other. May be.

As shown in FIGS. 1 and 5, the first elastic portion 12 includes a rubber-made flat cylindrical elastic member 14, a hard plate 15 made of a steel plate and a circular ring, and a circular ring made of a thick steel plate. And a flange 11 that is a hard plate. As shown in FIG. 8A, the three members of the hard plate 15, the elastic member 14, and the flange 11 are integrated by vulcanization adhesion by vulcanization of the elastic member 14.
The inner diameter of the elastic member 14 is set to a value slightly larger than the outer diameter of the boss 10, and the inner diameter of the hard plate 15 is matched with the inner diameter. The inner diameter of the flange 11 is set to a value that is clearly smaller than the outer diameter of the boss 10 and slightly larger than the outer diameter of the shaft portion of the bolt 13A. The outer diameter of the hard plate 15 is set to a value that is larger than the outer diameter of the elastic member 14 and equal to the outer diameter of the flange 11.
In the first embodiment, the shock absorber A is composed of two parts, the first elastic part 12 and the second elastic part 9.

  The boss 10 is disposed between the flange 11 of the first elastic portion 12 and the mounting portion 7 c of the tank stay 7 while being inserted into the support hole 8 c of the support frame 8. Then, the tank support structure has a shaft as shown in FIG. 1 by bolt means 13 passing through the hole 11a of the flange 11, the first elastic portion 12, the boss 10, the second elastic portion 9, and the hole 7d of the mounting portion 7c. It is tightened and fixed with the center P.

  In the tank support structure according to the first embodiment, the length of the boss 10 is obtained by adding the thickness obtained by subtracting the thickness of the flange 11 from the first elastic portion 12, the thickness of the second elastic portion 9, and the thickness of the lateral wall portion 8b. The length is set slightly shorter than the value. Therefore, in a free state in which the nut 13B is only lightly tightened without applying pressure, as shown in FIG. 2, there is a dimension α between the boss 10 mounted on the flange 11 and the mounting portion 7c. The gap is set to be formed.

  Then, from the free state shown in FIG. 2, when the bolt means 13 is forcibly screwed by relatively rotating the bolt 13A and the nut 13B in the tightening direction, the first and second elastic portions as shown in FIG. 12 and 9 are slightly compressed so as to reduce the thickness in the direction of the axis P, so that the boss 10 is brought into contact (pressure contact) with the mounting portion 7c. In this assembled state, the bolt means 13, the flange 11, and the boss 10 are relatively fixed (integrated) to the tank stay 7. That is, the thickness of the shock absorber A is set so that in the assembled state of the tank support structure, the buffer A is pre-compressed with the predetermined amount α which is the dimension of the gap. In the first embodiment, the compression amount of each elastic portion 14 is set to α / 2.

  In this tank support structure, the weight of the fuel tank 6 or the like causes the second elastic portion 9 to act in the direction of compressing, and the first elastic portion 12 acts in the direction of expanding (pulling) in the axis P direction. It is elastically supported. In a construction machine, the swivel base 3 may vibrate up and down, left and right or vigorously reciprocate due to traveling vibration on a rough road, work site work vibration, or the like. In such a case, a force in a direction to lift the fuel tank 6 acts due to inertia (moment of inertia), so that the first elastic portion 12 acts in a compressing direction and the second elastic portion 9 is pivoted. It is in a state where it is elastically supported by acting in the direction of expansion (pulling) in the direction of the heart P.

  In the assembled state shown in FIG. 1, when the elastic portions 12 and 9 are compressed by the vertical force acting as described above, the elastic member 14 expands and deforms in and out of the diameter. Therefore, in the free state shown in FIG. 2, it is desirable to make the inner diameter of the elastic member 14 somewhat larger than the outer diameter of the boss 10 in view of the expansion.

  By the way, as shown in FIG. 9A, the first elastic portion 12 has a fitting portion 15a in which the inner diameter of the hard plate 15 is reduced so that the inner diameter of the hard plate 15 is fitted to the cylindrical portion 10 with little or no gap. A structure may be used. With such a configuration, it is possible to install the cylindrical portion 10 and the first elastic portion 12 concentrically or substantially concentrically at the time of assembly.

  Further, as shown in FIG. 9B, the second elastic portion 9 is partially reduced in diameter, such as an end portion, so that the inner diameter of the elastic member 14 is fitted to the cylindrical portion 10 with little or no gap. It is good also as a structure which has the fitted part 14a. With such a configuration, the cylindrical portion 10 and the second elastic portion 9 can be installed concentrically or substantially concentrically at the time of assembly.

  Although not shown, the first elastic portion 12 has a structure having a fitting portion 14a (see FIG. 9B) whose inner diameter is reduced in the middle between the upper and lower portions of the elastic member 14. Alternatively, the second elastic portion 9 may have a structure including a hard plate 15 having a fitting portion 15a (see FIG. 9A). If the elastic member 14 of the first elastic portion 12 and / or the second elastic portion 9 is formed of a high-attenuation rubber instead of a general rubber, it may have a high performance that is more excellent in shock absorption. it can.

  In the shock absorber A and the tank support structure using the same according to the first embodiment, not only the first elastic portion 12 that supports the load of the fuel tank 6 but also the second acting on the force that the fuel tank 6 tries to move upward. Since the elastic portion 9 is also provided, it is possible to perform vibration-proof support and shock-absorbing support of the fuel tank 6 during normal travel and work, and travel on rough roads with severe irregularities and undulations, Anti-vibration and shock-absorbing effects can be provided against inertial movement and impact movement upward of the fuel tank 6 during hard work involving vibration.

Since each elastic part 12 and 9 is comprised by integration of the elastic member 14 by rubber | gum etc., and the hard board 15 by metal plate etc., compared with the case where it comprises only the elastic member 14, it was compressed more strongly. In this case, the elastic deformation is suppressed by the hard plate 15, and it is possible to obtain advantages such as being able to withstand a high load or improving durability for the spring constant (rubber hardness) of the elastic member 14. .
In addition, when the vertical dimension between the tank stay 7 and the support frame 8 is changed without changing the vibration isolation and shock absorbing function of the fuel tank 6 due to specification changes, etc., the thickness of the hard plate 15 is changed. Therefore, it is possible to take a reasonable measure of keeping the thickness of the elastic member 14 as it is, and there is an advantage that the design is flexible.

  In addition, since the first and second elastic portions 12 and 9 are assembled in a pre-compressed state, the loosening of the bolt means 13 is eliminated or suppressed, so that it can be mounted without rattling or a heavy fuel tank can be stabilized. In addition to supporting it, it has the following advantages. For example, when the assumed load is 20 kN, the spring constant setting is 25 kN / mm, and the precompression amount in the assembled state of the elastic member 14 is 1 mm, so that the displacement at 20 kN load 20 kN ÷ 25 kN / mm = 0.8 mm. Thus, since the pre-compression amount is less than 1 mm, it is possible to continue to maintain a loose state from this point.

[Embodiment 2]
As shown in FIG. 7, the tank support structure and the shock absorber A according to the second embodiment have both an outer peripheral surface 10A of a boss portion (an example of a cylindrical portion) 10 and an inner peripheral surface of the lateral wall portion 8b, that is, a support hole 8c. Further, a low-friction means B that is subjected to a low-friction process to promote the sliding between the boss portion 10 and the support frame 8 may be provided. That is, in addition to the first and second elastic portions 12 and 9, a cylindrical tubular portion 10 that fits in a circular support hole 8 c is provided, and a support frame is provided on the outer peripheral surface 10 A of the tubular portion 10. 8 is equipped with low-friction means B that promotes sliding with 8.
The shock absorber A according to the first embodiment is composed of two parts, the first elastic portion 12 and the second elastic portion 9, whereas the shock absorber A according to the second embodiment has the first elastic portion 12 and the second elastic portion 12. It consists of three parts, an elastic part 9 and a cylindrical part 10 provided with low friction means B. The shock absorber A according to the first embodiment may be configured by three parts including the first elastic part 12, the second elastic part 9, and the boss 10.

  As the low friction means B, for example, the outer peripheral surface 10A may be coated with a fluororesin. When the lateral friction force acts on the tank support structure or when the fuel tank 6 and the support frame 8 move relatively, the low friction means B causes the boss portion 10 and the support frame 8 to move. The frictional resistance due to contact with the fuel tank is reduced, and the fuel tank cushioning performance and vibration proof performance are improved. The low friction means B may be applied to the support hole 8c.

By adopting the low friction means B, the relative vertical movement between the boss 10 and the support frame 8 becomes smooth, and the load can be more borne on the shock absorber A.
Further, since the boss 10 and the support frame 8 hardly move in the horizontal direction, the behavior in the direction in which the fuel tank 6 rotates (rotates) with respect to the support frame 8 with respect to the vertical axis can be suppressed as much as possible. The overload on the support frame 8 due to the behavior can be suppressed.

[First Embodiment]
As shown in FIG. 10A, the shock absorber A and the tank support structure using the same are the same as those of the first embodiment shown in FIG. A replacement configuration may be used. That is, the lower first elastic portion 12 is interposed between the supported portion 7 and the support portion 8 in an upside down position, and the cylindrical portion 10 is formed by the upper and lower flanges 11, 11. The structure is sandwiched between the upper and lower sides.

  In this case, the first elastic portions 12 and 12 that are used twice may have a rectangular shape in plan view as shown in FIG. For example, the elastic member 14 may be formed in a shape in which the width d2 in the direction along the left-right direction of the support frame 8 is longer than the width d1 in the direction along the longitudinal direction of the support frame 8. It is not necessary.

[Second Embodiment]
As shown in FIG. 11A, the shock absorber A and the tank support structure using the shock absorber A may have a configuration in which the flange 11 is integrated with the cylindrical portion 10 in the structure shown in FIG. It is. That is, as shown in FIG. 11 (a), the first elastic part 12 shown in FIG. 1 is replaced with the second elastic part 9, and the boss 10 has the same shape, size and function as the flange 11. This is a shock absorber A having a configuration replaced with a flanged boss (an example of a cylindrical portion) 10 integrally including a flange portion 10f and a cylindrical main body portion 10h, and a tank support structure using the same.

  The shock absorber A according to the second alternative embodiment may be composed of two second elastic parts 9, or three of two second elastic parts 9 and a flanged boss (an example of a cylindrical part) 10. It may be a component. Further, in the structure shown in FIG. 11 (a), the elastic member 14 of the second elastic portion 9 located on the lower side of the support frame 8 is integrated with the flange portion 10f by vulcanization adhesion or other means. It is also possible to adopt a shock absorber A to be taken or a tank support structure using the same.

[Third Embodiment]
As shown in FIG. 11 (b), the shock absorber A and the tank support structure using the shock absorber A may be configured such that the shock absorber A is arranged upside down in the structure shown in FIG. . That is, in FIG. 11B, the second elastic portion 9 is disposed on the support frame 8, the tank stay 7 is disposed thereon, the first elastic portion 12 is disposed thereon, and the support frame 8 is disposed. This is a tank support structure in which a cylindrical portion 10 is provided between the top and bottom of the flange 11. In this case, the hole 7d of the tank stay 7 corresponds to the “support hole h”.

  The first and second elastic portions 12 and 9 are both arranged in such a posture that the hard plate 15 is below the elastic member 14, but the second elastic portion 9 is such that the hard plate 15 is above the elastic member 14. The posture may be good. In this case, the load of the fuel tank 6 is handled by the second elastic part 9, and the load by the first elastic part 12 is handled upward by the unevenness of the construction machine, running up and down, or work vibration. Accordingly, in this third alternative embodiment, the tank stay (supported portion) 7 corresponds to “any one” and the support frame (support portion) 8 corresponds to “any other”.

6 Fluid tank 7 Supported part (any other)
8 Support part (either one)
8c Support hole 9 Second elastic part 10 Tubular part 10A Outer peripheral surface 11 Flange 12 First elastic part 13 Bolt means 14 Elastic member 15 Hard plate B Low friction means

Claims (12)

Any one of a supported part fixed to the fluid tank and a support part on the airframe side for supporting the fluid tank;
Between the upper and lower sides of the supported portion and a flange fixed to the other of the support portions via a cylindrical portion that is inserted in a support hole formed in either one of the support holes so as to be relatively movable. A first elastic part deployed in a state surrounding the shape part;
A second elastic portion arranged in a state surrounding the cylindrical portion between the upper and lower sides of either one and the other;
The first elastic portion and the second elastic portion are configured by integrating an elastic member and a hard plate ,
A shock absorber in which the inner diameter of each of the first elastic part and the second elastic part is set to be somewhat larger than the outer diameter of the cylindrical part .
In addition to the first and second elastic portions, the cylindrical tubular portion is fitted into the circular support hole.
2. The shock absorber according to claim 1, wherein a low-friction means that promotes sliding with any one of the cylindrical portions is provided on the outer peripheral surface of the cylindrical portion.   The shock absorber according to claim 1 or 2, wherein the first elastic portion and the second elastic portion are configured to be the same.   The shock absorber according to claim 1 or 2, wherein the flange is integrally provided on an end surface of the elastic member of the first elastic portion on a side not provided with the hard plate.   In the assembled state in which the flange and the tubular portion are in contact with each other, and the three portions are relatively fixed in a state in which the tubular portion is in contact with the other, the first and second elasticities The shock absorber according to any one of claims 1 to 4, wherein the shock absorber is configured to be in a pre-compressed state in which the thickness of the portion is reduced by a predetermined amount.   The shock absorber according to any one of claims 1 to 5, wherein the elastic member is formed of a high damping rubber. A second elastic portion between one of the supported portion fixed to the fluid tank and the support portion on the airframe side that supports the fluid tank, and the other of the supported portion and the supporting portion. Intervening,
In the support hole formed in any one of the above, the cylindrical portion in a state where the upper end is in contact with any one of the other is inserted and arranged so as to be relatively movable,
A flange in a state of being in contact with a lower end of the cylindrical part or a flange in a state of being integrally formed with a lower end of the cylindrical part, and a first elastic part interposed between the upper and lower sides of either one of the above,
The bolt means equipped in a state of being inserted through the cylindrical portion is configured to form an assembled state in which the flange and the other one are integrated via the cylindrical portion,
The first elastic portion and the second elastic portion are configured by integrating an elastic member in a state of surrounding the cylindrical portion and a hard plate in a state of surrounding the cylindrical portion ,
A construction machine tank support structure in which an inner diameter of each of the first elastic part and the second elastic part is set to be somewhat larger than an outer diameter of the cylindrical part .
  Equipped with low friction means for promoting slippage between the cylindrical portion and either one of the cylindrical outer peripheral surface and / or the one inner peripheral surface forming the circular support hole. The construction machine tank support structure according to claim 7.   The construction machine tank support structure according to claim 7 or 8, wherein the first elastic part and the second elastic part are configured to be identical to each other.   A flange that is in contact with the lower end of the cylindrical portion is provided, and the flange is integrally provided on an end surface of the first elastic portion on the side not provided with the hard plate. Item 9. The construction machine tank support structure according to Item 7 or 8.   11. The thickness of each of the first and second elastic portions is set to a state in which the thickness in the assembled state is a predetermined amount less than the thickness in the free state. The tank support structure for construction machinery described in 1.   The construction machine tank support structure according to any one of claims 7 to 11, wherein the elastic member is formed of a high damping rubber.

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