JP2008082417A - Shock absorber and carriage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shock absorber for improving rigidity in the axial direction, while absorbing a shock, by absorbing vibration in the radial direction; and a carriage superior in straightly advancing stability. <P>SOLUTION: This shock absorber 21 has an outer cylinder 24 interposed between a through-hole 13a formed in an installation part 13 of a sub-frame 12 and a shaft body 22 inserted into the through-hole 13a and fixed to a track frame 2, formed in a substantially cylindrical shape of absorbing the vibration propagating to the track frame 2 from the sub-frame 12 and fixed in a state of being inserted into the through-hole 13a by diametrically contracting or diametrically expanding an intermediate part 21c to one end part 21a and the other end part 21b, an inner cylinder 25 inserted into the outer cylinder 24 with a clearance by diametrically contracting or diametrically expanding the intermediate part 21c to one end part 21a and the other end part 21b in response to the outer cylinder 24 and inserting the shaft body 22, and an elastic layer 27 arranged in close contact between the outer cylinder 24 and the inner cylinder 25. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shock absorber that absorbs vibration and a chassis having the shock absorber.

Conventionally, in a covered belt type chassis used for agricultural machinery and construction machinery, a truck frame that supports the airframe mounted on the upper part of the chassis, and is provided between the track frame and the inner peripheral surface of the covered belt, In some cases, a shock absorber that absorbs and buffers vibrations may be provided between the wheel portions that support the frame. As such a shock absorber, there is one that is substantially cylindrical and includes an inner cylinder, an outer cylinder, and an elastic layer interposed between the inner cylinder and the outer cylinder. As a chassis having a buffer body, for example, the chassis has a plurality of the above-described buffer bodies, the respective inner cylinders are connected by a connecting member, the wheel portion is fixed to the connecting member, and the axial direction of the buffer body is set to the width of the chassis. A structure in which the track frame is fixed to the outer cylinder of the buffer body so as to coincide with the direction has been proposed (see, for example, Patent Document 1). In a chassis having such a shock absorber, the elastic layers of the plurality of shock absorbers are each compressed and deformed, so that vibrations propagated from the rolling wheels to the track frame can be absorbed and buffered. ing.
JP-A-8-21472

  However, in the buffer body of Patent Document 1, the elastic layer compressively deforms with respect to a force acting in the radial direction, whereas the elastic layer undergoes shear deformation with respect to a force acting in the axial direction. That is, the axial rigidity of the buffer body is lower than the radial rigidity orthogonal to the axial direction. For this reason, in a chassis having such a shock absorber, a sufficient shock absorbing action can be expected with respect to vibrations in the running direction and the vertical direction, but in the width direction perpendicular to the running direction, the rigidity of the shock absorber is It has been desired to further improve the straight running stability.

  The present invention has been made in view of the above-described circumstances, and provides a shock absorber that absorbs and absorbs vibration in the radial direction and has improved axial rigidity, and a chassis that is excellent in straight running stability. To do.

In order to solve the above problems, the present invention proposes the following means.
The present invention provides a gap between a through hole formed in one of the vibration generating portion and the vibration receiving portion and a shaft body inserted into the through hole and fixed to the other of the vibration generating portion or the vibration receiving portion. It is a substantially cylindrical buffer that is interposed and absorbs vibration propagated from the vibration generating part to the vibration receiving part, and the intermediate part is reduced in diameter or enlarged with respect to one end and the other end, An outer cylinder fixed in a state of being inserted into the through-hole, and an intermediate portion having a diameter reduced or enlarged with respect to the one end and the other end corresponding to the outer cylinder, and the outer cylinder has a gap. And an inner cylinder into which the shaft body is inserted, and an elastic layer provided in close contact between the outer cylinder and the inner cylinder.

  According to the shock absorber according to the present invention, the elastic layer is elastically compressed and deformed in the radial direction between the outer cylinder and the inner cylinder with respect to the radial vibration generated from the vibration generating portion. Can absorb and buffer vibrations. Furthermore, both the outer cylinder and the inner cylinder have an intermediate portion with a reduced diameter or an enlarged diameter with respect to the one end portion and the other end portion. For this reason, since the elastic layer in the portion that is reduced or expanded in diameter is elastically deformed in the axial direction with respect to the force acting in the axial direction, the rigidity in the axial direction can be improved.

Moreover, in the above buffer body, it is more preferable that the outer cylinder and the inner cylinder are formed in a tapered shape from one end and the other end to the middle.
According to the shock absorber according to the present invention, since the entire elastic layer is elastically compressed and deformed with respect to the force acting in the axial direction by being formed in a tapered shape, the rigidity in the axial direction is reduced. Further improvement can be achieved.

Furthermore, in the above-described shock absorber, an intermediate portion between the outer cylinder and the inner cylinder is reduced or expanded in diameter relative to the one end and the other end corresponding to the outer cylinder and the inner cylinder. And at least one intermediate cylinder inserted with a gap between the outer cylinder and the inner cylinder, and the elastic layer is in close contact with each of the outer cylinder, the inner cylinder, and the intermediate cylinder More preferably, a plurality are provided.
According to the shock absorber according to the present invention, the rigidity of the elastic layer can be further improved in both the radial direction and the axial direction by providing an intermediate cylinder between the outer cylinder and the inner cylinder and using a plurality of elastic layers. it can.

  Further, in the above-described buffer body, the outer cylinder portion that is tapered from the reduced diameter portion on one end side to the enlarged diameter portion on the other end side, and the diameter is increased in a tapered shape corresponding to the outer cylinder portion, A pair of cushioning members having an inner cylinder part inserted into the outer cylinder part with a gap, and an elastic part provided in close contact between the outer cylinder part and the inner cylinder part, Either the reduced diameter part or the enlarged diameter part of the buffer member is in contact with and assembled with each other, so that the outer cylinder is connected by the outer cylinder part of the pair of buffer members, and the inner cylinder of the pair of buffer members. More preferably, the inner cylinder is constituted by a portion, and the elastic layer is constituted by the elastic portion of the pair of buffer members.

  According to the shock absorber according to the present invention, the outer cylinder portion of the pair of buffer members is assembled to constitute the outer cylinder, and the elastic portion and the inner cylinder portion of the pair of buffer members are sequentially inserted from the one end portion and the other end portion. By assembling, the elastic layer and the inner cylinder can be configured, and assembly can be facilitated. Further, when the inner cylinder is assembled, the elastic layer can be pressed between the outer cylinder and the elastic layer can be pre-compressed, so that the durability can be improved.

Further, in the above-described buffer body, the buffer member has at least one intermediate cylinder part inserted with a gap between the outer cylinder part and the inner cylinder part, and the elastic part is the outer cylinder part. More preferably, a plurality of cylinders are provided between the cylinder, the inner cylinder, and the intermediate cylinder.
According to the shock absorber according to the present invention, the rigidity of the elastic layer can be further improved by providing the buffer member with the intermediate cylinder portion and providing a plurality of elastic layers assembled with the elastic portion.

In the above buffer, it is more preferable that the outer cylinder and the inner cylinder have a taper angle of 10 degrees or more and 30 degrees or less, and are formed in a tapered shape.
According to the shock absorber according to the present invention, by setting the taper angle to 10 degrees or more and 30 degrees or less, the rigidity in the axial direction can be improved without decreasing the rigidity in the radial direction.

  Further, the chassis of the present invention includes a track frame that is a vibration receiving portion that supports the airframe, a pair of covering bands disposed on both sides of the track frame, and a plurality of sub-bands that are vibration generating portions that support the track frame. A frame, and a rotating wheel that is pivotally attached to the subframe, abuts on the covering band, and can rotate following the covering band, and either the track frame or the subframe includes a penetrating hole. A hole is formed in the width direction perpendicular to the traveling direction, and the through hole is fixed in a state where the buffer body is inserted, and on the other side, a shaft body inserted in the buffer body is fixed, Between the track frame and the sub frame, an elastic member is provided in close contact with the shaft body at at least two places in the traveling direction.

  According to the chassis according to the present invention, vibration is propagated from the covering band to the wheel and from the wheel to the subframe due to road surface unevenness or the like. The vibration of each component in the traveling direction and the vertical direction perpendicular to the axial direction of the buffer body is absorbed and buffered by the elastic layer of the buffer body being elastically compressed and deformed in the traveling direction and the vertical direction. Further, the vibration around the shaft of the buffer body is absorbed and buffered by elastically compressing and deforming elastic members provided before and after the shaft body. In addition, since the axial rigidity of the shock absorber is ensured, deformation of the elastic layer of the shock absorber due to an external force acting in the width direction is suppressed, and the wheels mounted on the subframe are displaced in the width direction. Can be prevented.

  According to the shock absorber of the present invention, the outer cylinder and the inner cylinder are reduced in diameter or expanded in the intermediate portion, so that the vibration in the radial direction can be absorbed and buffered, and the rigidity in the axial direction can be improved. it can. Further, in a chassis having such a buffer body, vibrations in the running direction and the vertical direction can be effectively absorbed and buffered, and displacement in the width direction of the rolling wheels can be prevented to improve straight running stability. Can be planned.

(First embodiment)
1 to 5 show a first embodiment according to the present invention. As shown in FIG. 1, the chassis 1 of this embodiment includes a track frame 2 on which the airframe A is mounted and supported, and a pair of cover strips 3 disposed on both sides of the track frame 2. A pair of idle wheels 4 are rotatably mounted on the front end of the track frame 2, and a pair of drive wheels 5 are rotatably mounted on the rear end. The drive wheel 5 is rotationally driven by a drive unit (not shown). Each of the pair of covering bands 3 is spanned between a pair of idler wheels 4 and drive wheels 5. Further, a rolling wheel portion 10 is provided between the track frame 2 and the grounding side inner peripheral surface 3 a of the covering band 3. The roller section 10 and the track frame 2 are rotatably connected by a substantially cylindrical buffer body 21 and a shaft body 22 inserted into the buffer body 21. In the present embodiment, there are three rolling wheel portions 10 on each side of the track frame 2, for a total of six, and supports the track frame 2.

  FIG. 2 is an enlarged side view of the wheel section 10, and FIG. 3 is a cross-sectional view. As shown in FIGS. 2 and 3, the roller section 10 includes a wheel 11 and a sub-frame 12 that is a vibration generating section that rotatably mounts the wheel 11. The roller 11 is in contact with the cover 3 and can rotate following the cover 3 that travels by the drive wheel 5. As shown in FIG. 3, the subframe 12 is provided with an attachment portion 13 connected to the track frame 2. A through hole 13a having a diameter reduced in a taper shape from both ends to the center is formed in the attachment portion 13 in the width direction Y orthogonal to the traveling direction X, and is fixed in a state where the buffer body 21 is inserted. An opening 2 a that opens downward and a through hole 2 b that penetrates in the width direction Y are formed in a portion connected to the attachment portion 13 of the track frame 2. The mounting portion 13 of the subframe 12 is inserted into the opening 2a of the track frame 2 so that the through hole 2b and the through hole 13a are coaxial, and the shaft body is inserted into the through hole 2b and the buffer body 21. 22 is rotatably fixed to the track frame 2.

  As shown in FIG. 4, the buffer body 21 includes an outer cylinder 24 that is fixed in a state of being inserted into the through hole 13 a of the mounting portion 13 of the subframe 12, and an inner cylinder that is inserted into the outer cylinder 24 with a gap. A cylinder 25 and an intermediate cylinder 26 inserted with a gap between the outer cylinder 24 and the inner cylinder 25 are provided. An elastic layer 27 that can be elastically deformed is provided in close contact between the outer cylinder 24 and the intermediate cylinder 26 and between the inner cylinder 25 and the intermediate cylinder 26. The elastic layer 27 is made of rubber, for example. The outer cylinder 24, the intermediate cylinder 26, and the inner cylinder 25 are reduced in diameter in a tapered shape from the one end 21a and the other end 21b to the intermediate section 21c, respectively. In this embodiment, more specifically, the buffer body 21 is substantially cylindrical and has a pair of buffer members 28 whose diameter is increased in a tapered shape from the reduced diameter portion 28a on one end side to the enlarged diameter portion 28b on the other end side. Are configured such that the reduced diameter portions 28a abut against each other. The buffer member 28 includes an outer cylinder part 28c, an inner cylinder part 28d, and an intermediate cylinder part 28e, each of which is reduced in taper shape. The inner cylinder part 28d is inserted into the outer cylinder part 28c with a gap, and the intermediate cylinder part 28e is inserted with a gap between the outer cylinder part 28c and the inner cylinder part 28d. Further, an elastic part 28f is provided in close contact between the outer cylinder part 28c and the intermediate cylinder part 28e and between the inner cylinder part 28d and the intermediate cylinder part 28e. In the present embodiment, the taper angle θ of each member is set to 10 degrees or more and 30 degrees or less.

  Further, as shown in FIG. 3, the shaft body 22 corresponds to the shape of the inner cylinder 25 of the buffer body 21, and is reduced in diameter from the one end portion 22a and the other end portion 22b to the intermediate portion 22c. The body 21 is rotatably inserted. More specifically, the shaft body 22 includes a convex member 29 and a concave member 30 into which the convex member 29 is inserted and assembled together. The convex member 29 is provided with a fixing plate 29a that can be fixed to the track frame 2 with bolts 2c on the base end side, and has a diameter that is tapered toward the distal end side, and a convex portion that is inserted into the concave portion 30 on the distal end side. 29b is provided. A plurality of screw holes 29c are formed at the tip of the convex portion 29b. The recess member 30 is provided with a fixing plate 30a that can be fixed to the track frame 2 with bolts 2c on the base end side, and has a tapered diameter reduced toward the distal end side. A recess 30b is formed in which is inserted. Further, in the fixing plate 30a of the concave member 30, a through hole 30c is formed at a position corresponding to the screw hole 29c when the convex member 29 is inserted into the concave member 30.

  The buffer body 21 and the shaft body 22 inserted into the buffer body 21 are assembled as follows. That is, as shown in FIG. 4, the outer cylinder portions 28c of the pair of buffer members 28 constituting the buffer body 21 are inserted into the through holes 13a of the attachment portion 13 of the subframe 12 from both ends of the through holes 13a. Furthermore, the buffer body 21 is assembled to the attachment portion 13 of the subframe 12 by inserting the elastic portion 28f, the intermediate cylindrical portion 28e, the elastic portion 28f, and the inner cylindrical portion 28d in this order from both sides of the through hole 13a. Next, as shown in FIG. 3, the inner cylinder 25 of the buffer body 21 and the through hole 2b formed in the track frame 2 are coaxial, and the convex member 29 and the concave member 30 are inserted from both sides of the through hole 2b. . Then, the protrusion 29b of the protrusion 29 is inserted into the recess 30b of the recess 30 and the bolt 31 is screwed into the screw hole 29c, so that the protrusion 29 and the recess 30 are inserted into the shock absorber 21. Are integrated to form the shaft body 22. Finally, the fixing plates 29a and 30a are fixed to the track frame 2 by the bolt 2c, and the track frame 2, the sub frame 12, the buffer body 21, and the shaft body 22 are integrated.

  In addition, as shown in FIG. 2, the elastic member 23 is provided between the lower surface 2 d of the truck frame 2 of the chassis 1 and the upper surface 12 a of the subframe 12 at two locations before and after the traveling direction X of the shaft body 22. It is closely attached. The elastic member 23 includes a pair of vibration isolation pads 32 fixed to the lower surface 2d of the track frame 2 and the upper surface 12a of the subframe 12 respectively. As shown in FIG. 5, the anti-vibration pad 32 includes a plate 32a that is fixed to each fixing location, and an elastic portion 32b that is fixed to the plate 32a and formed of rubber.

  Next, the operation of the chassis 1 and the buffer body 21 will be described. The chassis 1 travels in the traveling direction X by rotating the driving wheel 5 by a driving force from a driving unit (not shown) and rotating the covering band 3 following this. At this time, the sub-frame 12 supports the track frame 2 on which the airframe A is mounted, and the rolling wheels 11 that are pivotally attached to the sub-frame 12 are rotated together with the cover 3 to enable traveling. When an external force is applied to the covering band 3 due to road surface irregularities during traveling, this becomes a vibration and turns the covering band 3 to the wheel 11, the wheel 11 to the subframe 12, and the subframe 12 to the track frame 2. Propagated to. Such vibration is divided into components of the traveling direction X, the vertical direction Z, and the rotational direction R.

  The vibration of each component in the traveling direction X and the vertical direction Z is absorbed and buffered by elastically compressing and deforming the elastic layer 27 of the buffer body 21 in the direction displaced by the vibration. Note that the vibration of the component in the vertical direction Z is absorbed and buffered even when each vibration isolation pad 32 of the elastic member 23 is elastically compressed and deformed. Further, the vibration of the component in the rotation direction R around the axis of the shaft body 22 is caused by elastic compression deformation of the elastic member 23 provided in the rotating direction among the elastic members 23 provided on both sides of the shaft body 22. Is absorbed and buffered. At this time, since the buffer body 21 and the shaft body 22 that connect the track frame 2 and the subframe 12 are configured to be rotatable, the elastic layer 27 of the buffer body 21 is caused by twist due to vibration. The force to act does not act.

  On the other hand, with respect to an external force acting in the width direction Y that coincides with the axial direction of the buffer body 21, the buffer body 21 and the shaft body 22 extend from the one end 21a, 22a and the other end 21b, 22b to the intermediate section 21c, 22c. Since the diameter is reduced in a tapered shape, the elastic layer 27 is elastically compressed and deformed in the width direction Y.

  Conventionally, in a cylindrical buffer body in which an elastic layer is interposed in an intermediate portion, the elastic layer undergoes shear deformation when an external force is applied in the axial direction. For this reason, if the rigidity of the elastic layer against deformation in the radial direction is 1.0, the rigidity against deformation in the axial direction can be obtained only from about 0.1 to 0.2. On the other hand, in the buffer body 21 of this embodiment, when an external force acts in the axial direction as described above, the entire elastic layer 27 is compressed and deformed. For this reason, the axial rigidity can be improved from about 0.3 to about 0.5 as a ratio to the radial rigidity. In order to ensure the rigidity in the axial direction, it is preferable to set the taper angle θ to 10 degrees or more. Further, by further increasing the taper angle θ, the rigidity ratio in the axial direction with respect to the radial direction is further increased, but considering the rigidity in the traveling direction X and the vertical direction Z, it is preferable to set the angle to 30 degrees or less. is there.

  In the buffer body 21 of the present embodiment, an intermediate cylinder 26 is provided between the outer cylinder 24 and the inner cylinder 25, and a plurality of elastic layers 27 are provided. Thus, by setting it as the laminated structure which has multiple elastic layers 27, the rigidity of the elastic layer 27 can further be improved both in a radial direction and an axial direction.

  Moreover, in the buffer body 21 of the present embodiment, a pair of buffer members 28 are assembled. And as above-mentioned, it inserts in the through-hole 13a of the attaching part 13 of the wheel part 10 from the outer cylinder part 28c of the buffer member 28 in order. Further, by being assembled together with the convex member 29 and the concave member 30 constituting the shaft body 22, the elastic portion 28f constituting the elastic layer 27 is changed from the one end portion 21a and the other end portion 21b to the intermediate portion 21c by the inner cylinder portion 28d. It is possible to make a state in which pre-compression is applied toward Since the buffer body having the conventional elastic layer is cylindrical, it has been difficult to apply the above-described preliminary compression in the axial direction. Further, when assembling, it is necessary to press-fit the elastic layer and the inner cylinder into the outer cylinder without any gap, and accuracy is required for the inner diameter and the outer diameter of each member. Further, in order to integrate, it is necessary to further draw the outer cylinder after press-fitting, which increases the manufacturing cost. On the other hand, in the buffer body 21 of the present embodiment, the durability is improved by being preliminarily compressed, and the assembly is easy, so that the manufacturing cost can be reduced.

  As described above, in the buffer body 21, the outer cylinder 24 and the inner cylinder 25 are perpendicular to the axial direction, that is, the traveling direction X, because the intermediate portion 21 c has a reduced diameter with respect to the one end portion 21 a and the other end portion 21 b. The rigidity in the width direction Y can be improved. For this reason, according to the chassis 1 having such a buffer body 21, the vibration in the traveling direction X and the vertical direction Z is absorbed and buffered, and the displacement in the width direction of the wheel 11 that is axially attached to the subframe 12 is also absorbed. Can be prevented and the straight running stability can be improved.

(Second Embodiment)
FIG. 6 shows a second embodiment according to the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  As shown in FIG. 6, the buffer body 40 of this embodiment is configured by abutting and assembling the enlarged diameter portions 28 b of the pair of buffer members 28. For this reason, the buffer body 40 is diameter-expanded from the one end part 40a and the other end part 40b to the intermediate part 40c. As described above, even when the diameter of the intermediate portion 40c is increased, the elastic layer 41 formed by the elastic portion 28f of the buffer member 28 is compressed and deformed in the axial direction against a force acting in the axial direction. Stiffness can be improved.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  In addition, although the buffer body shall be diameter-reduced or expanded in a taper shape, it is not restricted to these. For example, it may be formed in a step shape or partially tapered. Further, the shape of the taper is not limited to a linear shape, and may be a shape curved in a convex shape or a concave shape. At least, if the intermediate portion is expanded or contracted with respect to the one end and the other end, the elastic layer is compressed and deformed at the expanded or contracted portion with respect to the force acting in the axial direction. The same effect can be expected. Further, the taper angle θ does not have to be equal on the one end side and the other end side, and the one end and the other end have different diameters, or the position of the intermediate portion is toward the one end or the other end. As an eccentric configuration, the one end side and the other end side may be different. Further, the shock absorber is composed of a pair of shock absorbing members, but is not limited to this, and at least an outer cylinder whose intermediate portion is expanded or contracted with respect to one end portion or the other end portion, What is necessary is just to be comprised by the inner cylinder and the elastic layer.

  In addition, although the buffer body 21 is fixed to the attachment portion 13 of the subframe 12 and the shaft body 22 is fixed to the track frame 2, the shaft body is fixed to the attachment portion 13 of the subframe 12, and the track frame 2 is fixed. The same effect can be expected even when the buffer is fixed to the structure. The buffer body 21 is composed of the outer cylinder 24, the inner cylinder 25, the intermediate cylinder 26, and the two layers of the elastic layer 27. However, the outer cylinder 24 and the inner cylinder 25 and at least one elastic layer are included. 27, the same effect can be expected, and a plurality of intermediate cylinders 26 and a plurality of elastic layers 27 may be provided.

  Moreover, although the elastic member 23 shall be provided one each before and after the shaft body 22 and the running direction X, it is not restricted to this. At least before and after the shaft body 22, it is only necessary to absorb the vibration by compressing and deforming the elastic member 23 regardless of the direction of rotation around the axis. It may be provided. The elastic member 23 is composed of a pair of anti-vibration pads 32, but one anti-vibration pad 32 is fixed to one of the track frame 2 or the subframe 12, and the other is the elasticity of the anti-vibration pad 32. It is good also as a structure which the part 32b contact | abuts. Furthermore, not only the anti-vibration pad 32 but a coil spring or the like may be used as long as it has at least elasticity.

  In addition, the shock absorber is provided between the subframe 12 and the truck frame 2 of the chassis 1. However, the present invention is not limited to this. You can expect.

It is a side view of the chassis of 1st Embodiment of this invention. It is the side view to which the connection part of the track frame and sub-frame of the chassis of 1st Embodiment of this invention was expanded. It is sectional drawing to which the connection part of the track frame and sub-frame of the chassis of 1st Embodiment of this invention was expanded. It is (a) sectional drawing of the buffer body of 1st Embodiment of this invention, (b) It is a front view. It is (a) top view of the elastic member of 1st Embodiment of this invention, (b) It is a side view. It is sectional drawing of the buffer body of 2nd Embodiment of this invention.

Explanation of symbols

1 chassis 2 truck frame (vibration receiver)
3 Covering belt 11 Rolling wheel 12 Subframe (vibration generator)
13a Through-hole 21, 40 Buffer 21a, 40a One end 21b, 40b The other end 21c, 40c Intermediate part 22 Shaft 22a One end 22b The other end 22c Intermediate part 23 Elastic member 24 Outer cylinder 25 Inner cylinder 26 Intermediate cylinder 27 , 41 Elastic layer 28 Buffer member 28a Reduced diameter portion 28b Expanded portion 28c Outer tube portion 28d Inner tube portion 28e Intermediate tube portion 28f Elastic portion X Running direction Y Width direction Z Vertical direction θ Taper angle

Claims (7)

It is interposed between a through hole formed in one of the vibration generating part or the vibration receiving part and a shaft body inserted into the through hole and fixed to the other of the vibration generating part or the vibration receiving part. A substantially cylindrical shock absorber that absorbs vibration propagated from the vibration generating portion to the vibration receiving portion,
An outer cylinder whose diameter is reduced or expanded with respect to the one end and the other end, and is fixed in a state of being inserted into the through hole;
In correspondence with the outer cylinder, an intermediate part having a reduced diameter or an enlarged diameter with respect to the one end part and the other end part is inserted into the outer cylinder with a gap, and an inner cylinder into which the shaft body is inserted ,
A shock absorber comprising: an elastic layer provided in close contact between the outer cylinder and the inner cylinder. The shock absorber according to claim 1,
The outer cylinder and the inner cylinder are formed in a tapered shape from each of one end and the other end to an intermediate portion. The buffer body according to claim 1 or 2,
Between the outer cylinder and the inner cylinder, an intermediate portion is reduced in diameter or expanded with respect to one end and the other end corresponding to the outer cylinder and the inner cylinder, and the outer cylinder and the inner cylinder At least one intermediate cylinder inserted with a gap between
A plurality of the elastic layers are provided in close contact with each of the outer cylinder, the inner cylinder, and the intermediate cylinder. The shock absorber according to claim 2,
An outer cylindrical portion that has a tapered diameter from a reduced diameter portion on one end side to an enlarged diameter portion on the other end side, and has a tapered diameter corresponding to the outer cylindrical portion, and has a gap in the outer cylindrical portion. A pair of cushioning members having an inner cylinder portion inserted and an elastic portion provided in close contact between the outer cylinder portion and the inner cylinder portion,
Either the reduced diameter part or the enlarged diameter part of the pair of buffer members abut against each other and are assembled, so that the outer cylinder is connected to the outer cylinder part of the pair of buffer members by the outer cylinder part of the pair of buffer members. A shock absorber, wherein the inner cylinder is constituted by an inner cylinder portion, and the elastic layer is constituted by the elastic portions of a pair of the buffer members. The shock absorber according to claim 4,
The buffer member has at least one intermediate cylinder part inserted with a gap between the outer cylinder part and the inner cylinder part, and the elastic part includes the outer cylinder part, the inner cylinder part, and A buffer provided with a plurality of intermediate cylinders. The shock absorber according to claim 2,
The outer cylinder and the inner cylinder have a taper angle of 10 degrees or more and 30 degrees or less, and are formed in a tapered shape. A track frame, which is a vibration receiver that supports the aircraft,
A pair of covering strips disposed on both sides of the track frame;
A plurality of sub-frames which are vibration generating parts for supporting the track frame;
A rotating wheel that is pivotally attached to the subframe, abuts on the covering band, and can rotate following the covering band,
A through hole is formed in one of the track frame and the sub frame in a width direction perpendicular to the traveling direction, and the shock absorber according to any one of claims 1 to 6. Is fixed in the inserted state, and on the other side, the shaft body inserted in the buffer body is fixed, and the shaft body moves back and forth in the traveling direction between the track frame and the sub frame. A chassis having an elastic member in close contact with at least two places.

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