JP5454793B2 - Tube-in-tube damper - Google Patents

Description

  The present invention relates to a tube-in-tube damper in which an inner tube and an outer tube that are assembled concentrically with each other are connected via a rubber-like elastic body interposed between the two tubes. The tube-in-tube damper of the present invention is used, for example, for a propeller shaft of a vehicle such as an automobile, or for other types of shafts that transmit driving force.

Conventionally, as shown in FIG. 8, an inner tube 51 and an outer tube 52 assembled concentrically with each other are connected via a rubber-like elastic body 53 interposed between the tubes 51 and 52. A tube damper is known, and this damper is manufactured as follows.
(1) The rubber-like elastic body 53 is vulcanized and bonded to the outer peripheral surface of the inner tube 51, or the rubber-like elastic body 53 previously formed into a cylindrical shape is attached to the outer peripheral surface of the inner tube 51 and then heated and bonded to the inner tube 51. The tube 51 and the rubber-like elastic body 53 are sub-assembled.
(2) Next, an adhesive is applied to the inner peripheral surface of the outer tube 52 and a fitting liquid is applied to the inner peripheral surface. Is pressed in from the axial direction.
(3) Next, the rubber-like elastic body 53 is post-heat bonded to the inner peripheral surface of the outer tube 52.

  The above-mentioned conventional product has a disadvantage that the adhesion state between the rubber-like elastic body 53 and the outer tube 52 has unevenness (spots), and hence the adhesion quality is not stable. This is because each part has a shape that is long in the axial direction, and thus the adhesive is peeled off during press-fitting, or uneven distribution of stress occurs in the rubber-like elastic body (each rubber lump) 53. It is done.

JP-A-4-60235

  In view of the above points, an object of the present invention is to provide a damper structure that can suppress the occurrence of unevenness in the bonding state between a rubber-like elastic body and an outer tube, and thereby stabilize the bonding quality. .

  In order to achieve the above object, a damper according to claim 1 of the present invention comprises an inner tube and an outer tube which are assembled concentrically with each other via a rubber elastic body, and the rubber elastic body In a tube-in-tube damper that is bonded to the outer peripheral surface of the tube and is inserted into the outer tube together with the inner tube, a thread for connecting the rubber-like elastic body and the outer tube to each other at the time of insertion by screwing them together A shape is provided.

  The damper according to claim 2 of the present invention is the tube-in-tube damper according to claim 1, wherein the inner tube is inserted into the outer tube from one axial direction thereof, and the outer tube is inserted. A second inner tube inserted into the tube from the other side in the axial direction, a first rubber elastic body is bonded to the outer peripheral surface of the first inner tube, and a second inner tube is bonded to the outer peripheral surface of the second inner tube. A rubber-like elastic body is attached, and the first rubber-like elastic body and the outer tube, and the second rubber-like elastic body and the outer tube are each provided with the thread shape.

  The damper according to claim 3 of the present invention is the tube-in-tube damper according to claim 2 described above, wherein the thread-like shape is a combination of the first rubber-like elastic body and the outer tube, and the second rubber-like elasticity. The thread shape formed by the combination of the body and the outer tube is characterized in that the direction of the spiral of the thread is the same.

  The damper according to claim 4 of the present invention is the tube-in-tube damper according to claim 2 described above, wherein the thread-like shape is a combination of the first rubber-like elastic body and the outer tube, and the second rubber-like elasticity. The thread shape by the combination of the body and the outer tube is characterized in that the direction of the spiral of the thread is opposite.

  Furthermore, a damper according to a fifth aspect of the present invention is the tube-in-tube damper according to any one of the first to fourth aspects, wherein the thread shape is a thread island provided on the rubber-like elastic body. It comprises a combination of a male screw part provided and a female screw part provided with a screw groove provided in the outer tube, and the pitch of the thread shape is constant, and the axial width of the screw island and screw groove is in the insertion direction. It is characterized by being gradually widened from the tip to the rear.

  In the damper of the present invention having the above-described configuration, since the thread-like shape for screwing each other into the rubber-like elastic body and the outer tube is provided, the rubber-like elastic body is not press-fitted as in the conventional product. Also, it is assembled by screwing the sub assembly product consisting of the inner tube and the outer tube. The size of the interference is set smaller than that of the conventional press-fitting or set to zero so that the screw can be screwed in smoothly. Further, a torsion torque is applied at the final stage of screwing to eliminate a gap between the rubber-like elastic body and the outer tube, and a post-heating bonding process is performed. Therefore, since the screwing is performed smoothly, it is possible to suppress the peeling of the adhesive due to the bonding process, and it is possible to suppress the occurrence of uneven stress distribution in the rubber-like elastic body. In addition, when the thread shape is provided, the rubber-like elastic body and the outer tube are mechanically engaged in the circumferential direction, so that a stopper function against excessive torque can be exhibited.

  As for the combination mode of the inner tube and the outer tube, there are a mode in which both tubes are combined one by one and a mode in which two inner tubes are combined with one outer tube. In the latter case, the inner tube is an outer tube. A first inner tube inserted from one side in the axial direction and a second inner tube inserted into the outer tube from the other side in the axial direction, and a first rubber-like elastic body on the outer peripheral surface of the first inner tube. The second rubber-like elastic body is adhered to the outer peripheral surface of the second inner tube, and the first rubber-like elastic body and the outer tube, and the second rubber-like elastic body and the outer tube are each provided with a thread shape. It is done. In this case, the thread shape formed by the combination of the first rubber-like elastic body and the outer tube and the thread form formed by the combination of the second rubber-like elastic body and the outer tube have the same spiral direction. And a mode in which the direction of the spiral of the thread is opposite, and different torsional characteristics are exhibited in each mode.

  Regarding the pitch of the thread shape, it is desirable to set the pitch constant in order to ensure smooth screwing.

  The axial width of the screw island and screw groove may be constant, but if the width is gradually increased from the tip in the insertion direction to the rear, the rotational resistance at the beginning of screwing decreases, so that the screwing becomes smoother. It becomes.

  The present invention has the following effects.

  That is, according to the damper of the present invention, since the thread-like shape for screwing the rubber-like elastic body and the outer tube into each other is provided, the rubber-like elastic body and the inner tube are not pressed in as in the conventional case. Assemble by screwing the sub-assembly product and the outer tube. Accordingly, since the screwing is performed smoothly, it is possible to suppress the peeling of the adhesive due to the bonding process, and it is possible to suppress the occurrence of uneven stress distribution in the rubber-like elastic body. Therefore, according to the intended purpose of the present invention, it is possible to provide a damper structure that can suppress the occurrence of unevenness in the bonding state between the rubber-like elastic body and the outer tube, and thereby stabilize the bonding quality. Further, when the threaded shape is provided, the rubber-like elastic body and the outer tube are mechanically engaged in the circumferential direction, so that a stopper function against excessive torque can be exhibited. In addition, when the axial width of the screw island and the screw groove is set to be gradually wider from the tip in the insertion direction to the rear, the rotational resistance at the beginning of screwing is reduced, so that the screwing becomes smoother.

1 is a partially cutaway front view of a tube-in-tube damper according to a first embodiment of the present invention. Explanatory drawing showing the manufacturing process of the damper The partially cutaway front view of the tube-in-tube damper which concerns on 2nd Example of this invention The partially cut-away front view of the tube-in-tube damper according to the third embodiment of the present invention Half cut sectional view of the tube-in-tube damper according to the fourth embodiment of the present invention The partially cut-away front view of the tube-in-tube damper which concerns on 5th Example of this invention (A) is a graph showing the torsional characteristics of the damper according to the conventional example, and (B) and (C) are graphs showing the torsional characteristics of the damper according to the examples of the present invention. Front view of a conventional damper with a part cut away

  The present invention includes the following embodiments.

Constitution···
(1) The tube-in-tube damper is characterized in that a thread is formed on rubber and metal parts. Assemble the outer tube and the inner tube with rubber instead of the conventional press fitting. At this time, the outer tube and the rubber are threaded, and the interference is set so that it can be smoothly screwed in. At the final stage of screwing, a torsion torque is applied to eliminate a gap between the outer tube and the rubber, and a post-heating bonding process is performed.
(2) As an aspect, the following can be considered.
A. Shape B. with conventional thread Shape of connecting shaft (inner tube) divided into two a. Screw thread in the same direction b. (3) The rubber is not only vulcanized and molded directly into the inner tube, but it can also be molded into a strip shape, wrapped around the inner tube so as to have a thread, and then molded by post-heating bonding Is possible.
(4) A shape in which the outer tube is tapered so that it can be screwed more easily is also possible.
(5) The shape of the screw island can be made small at first and gradually increased to facilitate screwing.
(6) Torsional characteristics With the conventional shape, even if the torsional angle increases, the torque does not increase much (FIG. 7A). In the shape of the present invention, the spring constant in the screwing direction tends to increase (FIG. 7B). Further, in the case where the connecting shaft is divided into two parts and the thread is reversed, the spring constant tends to increase as the torsion angle increases in both positive and negative directions (FIG. 7C). Thus, the torsional characteristics can be easily changed.
(7) Assembly As a pretreatment, the outer tube is subjected to an adhesive treatment, and the inner rubber tube is dimensioned so that the adhesive is not peeled off or the fitting liquid is applied with no interference, and screwed in.

effect···
(8) Uniform adhesion quality can be expected by screwing smoothly.
(9) A stopper function against excessive torque can be expected by cutting the threads.

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment ...
FIG. 1 shows a tube-in-tube damper 1 according to a first embodiment of the present invention, and the damper 1 according to this embodiment is configured as follows.

  That is, first, an inner tube (inner cylinder or inner ring) 2 and an outer tube (outer cylinder or outer ring) 3 that are assembled concentrically with each other are provided. It is connected via a rubber-like elastic body (rubber) 4 interposed therebetween. About the combination of both the tubes 2 and 3, it is set as the aspect with which both the tubes 2 and 3 are combined 1 each.

  The rubber-like elastic body 4 has a cylindrical shape, is bonded to the outer peripheral surface of the inner tube 2, is inserted into the inner peripheral portion of the outer tube 3 together with the inner tube 2, and is bonded to the inner peripheral surface of the outer tube 3 after insertion. ing.

  Further, the rubber-like elastic body 4 and the outer tube 3 are provided with a thread shape 5 for screwing and joining the three and the four at the time of insertion in the assembly process. It is configured by a combination of a male screw portion 6 provided on the outer peripheral surface of the elastic body 4 and a female screw portion 7 provided on the inner peripheral surface of the outer tube 3.

The pitch of the thread shape 5 is set to a predetermined constant dimension over the entire axial length. The male screw portion 6 includes a screw island (screw thread) 6a. The outer peripheral surface (top) of the screw island 6a is formed in a cylindrical surface shape. Axial width w ₁ of Nejishima 6a is also over the entire axial length is set to a predetermined fixed size. The female thread portion 7 includes a thread groove 7a. The inner diameter surface (bottom portion) of the thread groove 7a is formed in a cylindrical surface shape. Axial width w ₂ of the screw groove 7a is also over the entire axial length is set to a predetermined fixed size. Nejishima 6a axial width _{w 2} of the axial width _{w 1} and the screw groove 7a in is set substantially the same size _{(w 1} ≒ _w 2). The outer diameter of the screw island 6a in the free state before insertion is set to be slightly larger than the inner diameter of the screw groove 7a. Accordingly, an interference is set on both the threads 6a and 7a. In comparison with the press-fitting structure, it is set to be small (to the extent that the adhesive applied in the post-process is not peeled off), thereby enabling smooth screwing. It should be noted that the interference is not set and may be zero. In this case, screwing is performed more smoothly.

  The inner tube 2 is formed into a cylindrical shape by a rigid material such as metal, and a connecting portion 2a made of a spline or the like is provided at one end in the axial direction (right side in the figure) and the other in the axial direction (in the figure). The left end is an opening 2b.

  Further, the outer tube 3 is also formed in a cylindrical shape by a rigid material such as metal, and a connecting portion 3a made of a knuckle or the like is provided at the other end portion in the axial direction, and one end portion in the axial direction is formed by an inner portion. It is set as the opening part 3b which inserts the tube 2 and the rubber-like elastic body 4. FIG.

The damper 1 is manufactured as follows.
(1) The rubber-like elastic body 4 is vulcanized and bonded to the outer peripheral surface of the inner tube 2, or the rubber-like elastic body 4 previously formed into a cylindrical shape is attached to the outer peripheral surface of the inner tube 2 and then heated and bonded. A sub-assembly product comprising the inner tube 2 and the rubber-like elastic body 4 is manufactured. When the rubber-like elastic body 4 is vulcanized and bonded (vulcanization molding) or previously molded into a cylindrical shape, the male thread portion 6 according to the thread shape 5 is formed. Correspondingly, the outer tube 3 is formed with a female thread portion 7 according to the thread shape 5.
(2) Next, an adhesive treatment such as applying an adhesive to the inner peripheral surface of the outer tube 3 is performed and a fitting liquid is applied to the inner peripheral surface, and the inner peripheral space of the outer tube 3 as shown in FIG. The sub-assembly product comprising the inner tube 2 and the rubber-like elastic body 4 is screwed into the opening 3b on one axial direction.
(3) When the screwing up to a predetermined distance is completed, the torsion torque is applied so that the tubes 2 and 3 are not relatively displaced in the axial direction, the gap between the outer tube 3 and the rubber elastic body 4 is eliminated, and the rubber elastic body 4 is pre-compressed.
(4) Next, the rubber-like elastic body 4 is post-heat bonded to the inner peripheral surface of the outer tube 3.

  According to the damper 1 having the above-described configuration, the thread-like shape 5 for screwing the rubber-like elastic body 4 and the outer tube 3 together is provided. Assembling is performed by screwing the sub-assembly product comprising the rubber-like elastic body 4 and the inner tube 2 and the outer tube 3 together. Therefore, since the screwing is performed smoothly, it is possible to suppress the peeling of the adhesive due to the bonding process, and it is possible to suppress the occurrence of uneven stress distribution in the rubber-like elastic body 4. Therefore, it is possible to suppress the occurrence of unevenness in the bonding state between the rubber-like elastic body 4 and the outer tube 3, thereby stabilizing the bonding quality. Further, when the thread shape 5 is provided, the rubber-like elastic body 4 and the outer tube 3 are engaged in the twisting direction (circumferential direction), so that a stopper function against the excessive torque can be exhibited, and the excessive torque This can prevent the rubber-like elastic body 4 from being damaged. As described above, the torsional characteristics tend to increase the spring constant in the screwing direction (FIG. 7B).

Second embodiment ...
FIG. 3 shows a tube-in-tube damper 1 according to the second embodiment of the present invention, and the damper 1 according to this embodiment is configured as follows.

  That is, first, inner tubes (inner cylinder or inner ring) 2A, 2B and outer tubes (outer cylinder or outer ring) 3 which are assembled concentrically with each other are provided, and both the tubes 2A, 2B, 3 are The tubes 2A, 2B, 3 are connected via rubber-like elastic bodies (rubbers) 4A, 4B interposed therebetween. The combination of both tubes 2A, 2B, and 3 is such that two inner tubes are combined with one outer tube, and the inner tube is inserted into the outer tube 3 from one axial direction (right side in the figure). The first inner tube 2A and the second inner tube 2B inserted from the other axial direction (left side in the figure), and the first inner tube 2A and the outer tube 3 are interposed between the two tubes 2A and 3 The second inner tube 2B and the outer tube 3 are connected through a second rubber-like elastic body 4B interposed between the tubes 2B and 3 and connected through the first rubber-like elastic body 4A. ing.

  The first rubber-like elastic body 4A has a cylindrical shape, is bonded to the outer peripheral surface of the first inner tube 2A, and is inserted into the inner peripheral portion of the outer tube 3 together with the first inner tube 2A. Bonded to the inner peripheral surface. Similarly, the second rubber-like elastic body 4B has a cylindrical shape, is bonded to the outer peripheral surface of the second inner tube 2B, and is inserted into the inner peripheral portion of the outer tube 3 together with the second inner tube 2B. It is glued to the inner peripheral surface.

  Also, the first rubber-like elastic body 4A and the outer tube 3 and the second rubber-like elastic body 4B and the outer tube 3 are respectively screwed and connected to each other at the time of the insertion in the assembly process. A thread shape 5 is provided. The thread shape 5 includes an external thread portion 6 provided on the outer peripheral surface of the first rubber-like elastic body 4A or the second rubber-like elastic body 4B, and an inner periphery of the outer tube 3. It is comprised by the combination with the internal thread part 7 provided in the surface, and the direction of the spiral of the thread in the both thread shape 5 is the same direction as shown.

  In each of the thread shape 5, the pitch of the thread shape 5 is set to a predetermined constant dimension over the entire axial length. The male screw portion 6 includes a screw island (screw thread) 6a. The outer peripheral surface (top) of the screw island 6a is formed in a cylindrical surface shape. The axial width of the screw island 6a is also set to a predetermined constant dimension over the entire axial length. The female thread portion 7 includes a thread groove 7a. The inner diameter surface (bottom portion) of the thread groove 7a is formed in a cylindrical surface shape. The axial width of the thread groove 7a is also set to a predetermined constant dimension over the entire axial length. The axial width of the screw island 6a and the axial width of the screw groove 7a are set to be approximately the same size. The outer diameter of the screw island 6a in the free state before insertion is set to be slightly larger than the inner diameter of the screw groove 7a. Accordingly, an interference is set on both the threads 6a and 7a. In comparison with the press-fitting structure, it is set to be small (to the extent that the adhesive applied in the post-process is not peeled off), thereby enabling smooth screwing. It should be noted that the interference is not set and may be zero. In this case, screwing is performed more smoothly.

  The first inner tube 2A is formed into a cylindrical shape by a rigid material such as metal, and a connecting portion 2a made of a spline or the like is provided at one end in the axial direction, and the other end in the axial direction is an opening 2b. ing. The second inner tube 2B is also formed into a cylindrical shape by a rigid material such as a metal, and a connecting portion 2a made of a knuckle or the like is provided at the other end in the axial direction, and one end in the axial direction is an opening 2b. ing.

  The outer tube 3 is also formed into a cylindrical shape by a rigid material such as metal, and both axial ends thereof are respectively the first inner tube 2A and the first rubber-like elastic body 4A or the second inner tube 2B and the second rubber. It is set as the opening part 3b which inserts the shape-like elastic body 4B. Further, a required number of through holes 3c are provided in the central portion of the outer tube 3 in the axial direction for extracting oil or air.

The damper 1 is manufactured as follows.
(1) The first rubber-like elastic body 4A is vulcanized and bonded to the outer peripheral surface of the first inner tube 2A, or the first rubber-like elastic body 4A previously formed into a cylindrical shape is attached to the outer peripheral surface of the first inner tube 2A. Then, post-heating bonding is performed to manufacture a subassembly product composed of the first inner tube 2A and the first rubber-like elastic body 4A. Similarly, the second rubber-like elastic body 4B is vulcanized and bonded to the outer peripheral surface of the second inner tube 2B, or the second rubber-like elastic body 4B previously formed into a cylindrical shape is attached to the outer peripheral surface of the second inner tube 2B. The subassembly product which consists of these 2nd inner tubes 2B and the 2nd rubber-like elastic body 4B is manufactured after mounting | wearing and heat-bonding. When the rubber-like elastic bodies 4A and 4B are vulcanized and bonded (vulcanization molding) or previously molded into a cylindrical shape, the male thread portion 6 according to the thread shape 5 is formed. Correspondingly, the outer tube 3 is formed with a female thread portion 7 according to the thread shape 5.
(2) Next, an adhesive treatment such as applying an adhesive to the inner peripheral surface of the outer tube 3 is performed and a fitting liquid is applied to the inner peripheral surface, so that one axial opening is formed in the inner peripheral space of the outer tube 3. The sub-assembly product composed of the first inner tube 2A and the first rubber-like elastic body 4A is screwed from the portion 3b. Similarly, the sub-assembly product composed of the second inner tube 2B and the second rubber-like elastic body 4B is screwed into the inner circumferential space of the outer tube 3 from the other opening 3b in the axial direction.
(3) When screwing up to a predetermined distance is completed, the first inner tube 2A and the outer tube 3 are not displaced relative to each other in the axial direction, and a torsion torque is applied, so that the gap between the outer tube 3 and the first rubber-like elastic body 4A. And pre-compression is applied to the first rubber-like elastic body 4A. Similarly, the second inner tube 2B and the outer tube 3 are not displaced relative to each other in the axial direction, and a torsion torque is applied to eliminate the gap between the outer tube 3 and the second rubber-like elastic body 4B. Apply pre-compression to 4B.
(4) Next, the first rubber-like elastic body 4A and the second rubber-like elastic body 4B are post-heat bonded to the inner peripheral surface of the outer tube 3, respectively.

  According to the damper 1 configured as described above, since the thread shape 5 for screwing each other into the first and second rubber-like elastic bodies 4A and 4B and the outer tube 3 is provided, the axial straight is provided as in the conventional product. The assembly is performed by screwing the outer tube 3 and the sub-assembly made of the rubber-like elastic bodies 4A and 4B and the inner tubes 2A and 2B, instead of press-fitting into the outer tube. Therefore, since the screwing is performed smoothly, it is possible to suppress the peeling of the adhesive due to the bonding process, and it is possible to suppress the occurrence of uneven stress distribution in the rubber-like elastic bodies 4A and 4B. Therefore, it is possible to suppress the occurrence of unevenness in the bonding state between the rubber-like elastic bodies 4A and 4B and the outer tube 3, thereby stabilizing the bonding quality. Further, when the thread form 5 is provided, the rubber-like elastic bodies 4A and 4B and the outer tube 3 are engaged in the twisting direction (circumferential direction), so that a stopper function against excessive torque can be exhibited. The rubber-like elastic bodies 4A and 4B can be prevented from being damaged by excessive torque. As described above, the torsional characteristics tend to increase the spring constant in the screwing direction (FIG. 7B).

Third embodiment ...
In the second embodiment, the direction of the spiral of the thread in both thread shapes 5 is the same. However, as shown in FIG. 4 as the third embodiment, the directions of the spirals are opposite to each other. In this case, the spring constant tends to increase as the torsion angle increases regardless of whether the torsional characteristics are positive or negative (FIG. 7C). The other configurations and operational effects of the third embodiment are the same as those of the second embodiment, and thus the description thereof is omitted.

  Further, it is conceivable to add / change the configuration of the dampers 1 according to the first to third embodiments as follows.

Fourth embodiment ...
In each of the first to third embodiments, the outer tube 3 has an axial straight cylindrical shape, but the outer tube 3 is tapered, or at least the inner peripheral surface of the outer tube 3 is tapered. Thus, screwing is further facilitated (at the beginning of screwing, since the outer diameter of the screw island 6a is smaller than the inner diameter of the screw groove 7a, the screwing is easy). The taper shape is such that the inner diameter dimension of the outer tube 3 gradually decreases as the sub-assembly product is inserted (screwed in). In FIG. 5 shown as the fourth embodiment, the outer tube 3 in the damper 1 according to the second or third embodiment is tapered, and the damper 1 according to the second or third embodiment is as described above. Since two inner tubes are combined with one outer tube, the outer tube 3 generally has a shape that gradually reduces the inner diameter of the outer tube 3 from both axial end portions to the axial central portion. It has a drum shape or an axial bi-directional trumpet shape.

Fifth Example ...
In the first to fourth embodiments, the axial widths w ₁ and w _{2 of the} thread island 6a and the thread groove 7a are set to predetermined constant dimensions over the entire axial length. The axial widths of the island 6a and the thread groove 7a are made smaller at the front end and gradually increased toward the rear end in accordance with the insertion direction of the sub-assembly product (screwing direction), thereby further facilitating screwing. (At the beginning of screwing, the axial width of the screw island 6a is smaller than the axial width of the screw groove 7a, so that the screwing is easy). In FIG. 6 shown as the fifth embodiment, the axial width of the screw island 6a in the damper 1 according to the first embodiment is set to be small at the front end and gradually increased toward the rear end (w ₁₁ <w _{12 <w 13 <w 14)} , in response to this, the axial width of the screw groove 7a is small at the tip, which is gradually increased set toward the rear end _{(w 21 <w 22 <w} 23 < w _24). Further, the axial width of the screw island 6a and the axial width of the screw groove 7a are set to be approximately the same for each corresponding position after the screwing is finished (w ₁₁ ≈w ₂₁ , w ₁₂ ≈w ₂₂ , w _{13 ≒ w 23, w 14 ≒} w 24). Thus, while w ₁₁ <w ₁₂ <w ₁₃ <w ₁₄ and w ₂₁ <w ₂₂ <w ₂₃ <w ₂₄ , w ₁₁ ≈w ₂₁ , w ₁₂ ≈w ₂₂ , w ₁₃ ≈w ₂₃ , By setting w ₁₄ ≈w ₂₄ , uniform or substantially uniform pre-compression can be applied over the entire axial width of the rubber-like elastic body 4. Note that the pitch remains constant.

Sixth Example ...
In each of the above embodiments, it has been described that the rubber-like elastic body 4 is formed into a cylindrical shape in advance, and this is attached to the outer peripheral surface of the inner tube 2 and then heated and bonded. The elastic body 4 may be formed into a strip shape in advance and attached so as to be wound around the outer peripheral surface of the inner tube 2. At this time, a thread may be attached and then post-heat-bonded.

DESCRIPTION OF SYMBOLS 1 Damper 2, 2A, 2B Inner tube 2a, 3a Connection part 2b, 3b Opening part 3 Outer tube 3c Through-hole 4, 4A, 4B Rubber-like elastic body 5 Thread shape 6 Male thread part 6a Screw island 7 Female thread part 7a Screw groove

Claims (5)

An inner tube and an outer tube that are assembled concentrically with each other are connected via a rubber-like elastic body, and the rubber-like elastic body is bonded to the outer peripheral surface of the inner tube and inserted into the outer tube together with the inner tube. In a tube-in-tube damper
A tube-in-tube damper, wherein the rubber-like elastic body and the outer tube are provided with a thread shape for screwing and joining them together at the time of insertion. The tube-in-tube damper according to claim 1,
The inner tube has a first inner tube inserted into the outer tube from one axial direction thereof, and a second inner tube inserted into the outer tube from the other axial direction thereof, A first rubber-like elastic body is bonded to the outer peripheral surface, and a second rubber-like elastic body is attached to the outer peripheral surface of the second inner tube, and the first rubber-like elastic body, the outer tube, and the second rubber A tube-in-tube damper, wherein the thread-like shape is provided in each of the elastic body and the outer tube. The tube-in-tube damper according to claim 2,
The thread shape formed by the combination of the first rubber-like elastic body and the outer tube and the thread form formed by the combination of the second rubber-like elastic body and the outer tube have the same spiral direction. A tube-in-tube damper. The tube-in-tube damper according to claim 2,
The thread shape formed by the combination of the first rubber-like elastic body and the outer tube and the thread shape formed by the combination of the second rubber-like elastic body and the outer tube are directions in which the directions of the spirals of the threads are opposite to each other. A tube-in-tube damper characterized by being made. The tube-in-tube damper according to any one of claims 1 to 4,
The thread form is a combination of a male thread part having a thread island provided in the rubber-like elastic body and a female thread part having a thread groove provided in the outer tube, and the pitch of the thread form is constant. The tube-in-tube damper is characterized in that the axial widths of the thread island and the thread groove are set to gradually increase from the distal end to the rear in the insertion direction.

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