JP6731324B2 - Shock absorber - Google Patents

Description

The present invention relates to a shock absorber.

In some shock absorbers interposed between a vehicle body and wheels of a vehicle, a rod is connected to the vehicle body and a cylinder is connected to an axle of the wheel. A connecting member for connecting the rod and the vehicle body in such a shock absorber is disclosed in, for example, Patent Document 1, and as shown in FIG. 5, a collar 600 mounted on the outer periphery of the upper end portion of the rod 200, and A pair of upper and lower rubber bushes 700 and 701 mounted on the outer periphery of the collar 600, upper and lower washers 800 and 801 stacked on the upper and lower sides of the collar 600, and a nut 900 screwed from the upper end of the rod 200 to the outer periphery of the rod 200. With.

According to the above configuration, with the lower washer 801, the collar 600, and the lower rubber bush 701 attached to the outer periphery of the rod 200, the rod 200 is attached to the attachment hole provided in the attachment portion b1 of the vehicle body from below. When the nut 900 is screwed in after the upper rubber bush 700 and the upper washer 800 are attached to the part that is inserted and projected into the vehicle interior, the vehicle body is inserted between the pair of rubber bushes 700 and 701. The mounting portion b1 of is clamped, and the rod 200 can be connected to the vehicle body.

JP-B-62-46934

The rubber bushes 700, 701 have elasticity and are shaped like a mortar so that the characteristic of the elastic force with respect to the compression amount becomes a desired characteristic, and are arranged with the opening sides facing each other. Spaces 710 and 711 are formed so as to surround the collar 600 between the inner peripheral side of 700 and 701 and the mounting portion b1 of the vehicle body. These spaces 710 and 711 communicate with each other through a gap formed between the collar 600 and the mounting portion b1 and form a continuous room R1.

Then, when an external force acts on the shock absorber attached to the vehicle in a direction of expanding the shock absorber, the upper rubber bush 700 is compressed and the lower rubber bush 701 is expanded, and conversely, the shock absorber is contracted. When an external force acts in the direction of causing the lower rubber bush 700 to be compressed, the upper rubber bush is expanded. As described above, in the case where the rubber bushes 700 and 701 are expanded and contracted and the difference in the compression amount between them is large, the deformation amount of the compression side rubber bush becomes larger than the deformation amount of the extension side rubber bush. As a result, the volume of the room R1 becomes smaller. On the contrary, in the process in which the difference between the compression amounts of the rubber bushes 700 and 701 becomes smaller, the volume of the room R1 increases, and the volume of the room R1 becomes maximum when the difference between the compression amounts is zero.

Further, in the conventional shock absorber, the chamber R1 is closed by the rubber bushes 700 and 701. For this reason, when the volume of the room R1 is reduced as described above, the pressure in the room R1 rises, and the gas in the room R1 may leak to the outer periphery of the rubber bush due to the pressure. Then, when the volume of the room R1 increases, the pressure in the room R1 decreases to a negative pressure, and the outside air (air around the rubber bush) may be sucked into the room R1.

Due to such a pumping action, for example, when the outside air is sucked into the room R1 during the process of contraction of the expanded lower rubber bush 701, the water existing on the outer periphery of the lower rubber bush 701 is discharged together with the outside air into the room R1. There is a risk of being sucked in. Then, when water is sucked into the room R1 in this way, when the lower rubber bush 701 is compressed and the pressure in the room R1 rises, the pressure in the room R1 causes the pressure in the upper rubber bush 700 to rise. There is a possibility of being pushed out to the outside and entering the passenger compartment.

Therefore, an object of the present invention is to provide a shock absorber capable of preventing water from entering the vehicle interior.

The shock absorber according to claim 1 for solving the above-mentioned problems includes a collar mounted on an outer circumference of a rod of the shock absorber main body, and a pair of rubber bushes mounted on an outer circumference of the collar to sandwich a mounting portion of a vehicle body. Prepare A hole is formed in the collar, and the chamber formed between the pair of rubber bushes communicates with the outside of the shock absorber through the hole. For this reason, the room is not hermetically closed, and even if the room is expanded, the negative pressure does not occur, so that water is not sucked into the room.

The shock absorber according to claim 2 is provided with the structure according to claim 1, and the chamber is communicated to the outside of the shock absorber through a gap formed between the hole and the collar and the rod. ing. Since there is a conventional gap between the collar and the rod, according to the above configuration, the hole can be communicated with the outside of the shock absorber by utilizing the conventional configuration. Therefore, the manufacturing cost of the shock absorber can be reduced.

According to a third aspect of the present invention, the shock absorber includes the configuration according to the first or second aspect, further includes a dust cover that covers the outer circumference of the rod, and the chamber communicates with the inside of the dust cover. Therefore, it is possible to more reliably prevent water from entering the vehicle interior.

A shock absorber according to a fourth aspect includes the configuration according to any one of the first to third aspects, and the hole is provided at a position where the rubber bush does not come into contact. Therefore, the rubber bush can be prevented from being damaged.

According to the shock absorber of the present invention, it is possible to prevent water from entering the vehicle interior.

It is the perspective view which simplified and showed the state where the shock absorber concerning one embodiment of the present invention was attached to the vehicle. It is the front view which notched and showed the shock absorber which concerns on one embodiment of this invention. It is the figure which expanded and showed a part of FIG. It is a longitudinal cross-sectional view showing a modified example of the shock absorber according to the embodiment of the present invention and showing an enlarged change portion. It is the front view which expanded a part of conventional shock absorber, and was shown notched partially.

Embodiments of the present invention will be described below with reference to the drawings. The same reference numerals allotted throughout the several figures refer to the same or corresponding parts.

As shown in FIG. 1, the shock absorber A according to the first embodiment of the present invention is interposed between a vehicle body B and a wheel W of a four-wheeled vehicle V. FIG. 1 shows a state in which the shock absorber A is attached to the rear wheels of the four-wheeled vehicle V, but the present invention is not limited to this, and may be attached to a vehicle other than the four-wheeled vehicle.

As shown in FIG. 2, the shock absorber A includes a shock absorber main body D having an outer shell 1 and a rod 2 slidably inserted in the outer shell 1 in an axial direction, and a rod 2 connected to a vehicle body B. Mounting member M, a bracket 4 that connects the outer shell 1 to the axle of the wheel W, and a bottomed cylindrical shape that is connected to the portion of the rod 2 that projects to the outside of the outer shell 1 so that the outer shell 1 goes in and out. And a dust cover 5. Then, when the impact due to the unevenness of the road surface is input to the wheel W, the rod 2 moves in and out of the outer shell 1 and the shock absorber body D expands and contracts, the outer shell 1 moves in and out of the dust cover 5, and the shock absorber A expands and contracts. To do.

Although the structure of the shock absorber main body D is well known, detailed illustration thereof will be omitted. However, the shock absorber main body D includes a cylinder provided inside the outer shell 1 and a piston slidably inserted into the cylinder. The lower end of the rod 2 in FIG. 2 is connected to the piston. Two chambers filled with a liquid such as hydraulic oil are formed in the cylinder. When the shock absorber A expands and contracts and the piston moves in the cylinder in the axial direction, a differential pressure is generated between the two chambers. A damping force is generated that hinders expansion and contraction.

A liquid storage chamber for storing liquid is formed between the outer shell 1 and the cylinder. This liquid storage chamber communicates with the inside of the cylinder and can compensate for a change in the volume of the cylinder corresponding to the volume of the rod that moves in and out of the cylinder, or for a change in the volume of the liquid in the cylinder due to a temperature change. As described above, the shock absorber A is configured as a multi-cylinder type having the cylinders arranged inside and outside and the outer shell 1, and the cylinder and the outer shell 1 constitute a reservoir that stores liquid inside. However, this is not the case.

For example, the reservoir is a separate tank installed laterally outside the cylinder, or a movable partition such as a free piston, bladder, or bellows that forms an inflatable air chamber is provided in the cylinder. The chamber may compensate for the volume change of the liquid due to the volume change in the cylinder and the temperature change corresponding to the rod projecting and retracting volume. In such a case, the outer shell 1 can be used as a cylinder to make the shock absorber A a single cylinder type. Further, the shock absorber A is a single rod type and the rod 2 extends from one side of the piston to the outside of the cylinder, but it may be a double rod type and the rod 2 extends from both sides of the piston to the outside of the cylinder. Further, the shock absorber A is a hydraulic shock absorber that utilizes a fluid force, but may be a pneumatic shock absorber or another shock absorber.

As shown in FIG. 3, the mounting portion b1 for mounting the shock absorber A on the vehicle body B is plate-shaped, and the mounting portion b1 has a mounting hole b2 penetrating the mounting portion b1 in the plate thickness direction. Has been done. In the mounting portion b1, the inner peripheral edge portion b3 surrounding the mounting hole b2 has a smaller plate thickness than the outer peripheral side thereof, a step b4 is formed at the outer peripheral end of the inner peripheral edge portion b3, and the inner peripheral edge portion b3 is vertically moved. There is an annular recess in the.

In FIG. 3, the upper side of the mounting portion b1 is the vehicle interior, the lower side is the vehicle interior, and the rod 2 is attached to the vehicle body B, and is arranged outside the vehicle compartment from the outer shell 1 (FIG. 2) to the vehicle body B side. To the rod body 2a, a stopper portion 2b provided at the upper end of the rod body 2a, an insertion portion 2c extending upward from the upper end of the stopper portion 2b coaxially with the rod body 2a and inserted into the mounting hole b2, and an insertion portion. It has an end bolt 2d which extends coaxially upward from the upper end of 2c and is arranged in the vehicle compartment.

The outer diameter of the stopper portion 2b is larger than the outer diameters of the rod body 2a and the insertion portion 2c, and the stopper portion 2b projects from the rod body 2a and the insertion portion 2c to the outer peripheral side (diameter direction outer side). The outer circumference of the end bolt 2d is male-threaded, and the outer diameter of the end bolt 2d is slightly smaller than the outer diameter of the insertion portion 2c. Then, the mounting member M is mounted above the stopper portion 2b of the rod 2 in FIG.

The mounting member M is provided on the outer circumference of the rod 2, and a tubular collar 6 mounted on the outer circumference of the rod 2, a pair of rubber bushes 7U and 7L mounted on the outer circumference of the collar 6 and arranged in the axial direction of the collar 6. A pair of washers 8U, 8L that are mounted and laminated on both axial sides of the collar 6 to sandwich the pair of rubber bushes 7U, 7L from both axial sides, and an internal thread are applied to the inner circumference of the end bolts. An annular nut 9 screwed onto the outer circumference of 2d.

Then, the rod 2 can be connected to the vehicle body by the mounting member M. Specifically, first, the collar 6 including the lower washer 8L and the lower rubber bush 7L in FIG. 3 is attached to the outer periphery of the rod 2. Subsequently, the rod 2 is inserted into the mounting hole b2 from the upper end in FIG. 3 from the lower side of the vehicle body B, and the rubber bush 7U on the upper side in FIG. The washer 8U is stacked. Next, when the nut 9 is screwed from the upper end of the rod 3 in FIG. 3 and the nut 9 is tightened, the mounting portion b1 of the vehicle body B is attached by the rubber bushes 7U and 7L in FIG. The rod 2 is sandwiched and connected to the vehicle body B. Hereinafter, each member constituting the mounting member M will be described in detail.

The collar 6 is a metal pipe, and the pair of washers 8U and 8L are metal annular plates, the inner diameters of which are slightly larger than the outer diameter of the insertion portion 2c and larger than the outer diameter of the stopper portion 2b. Is also small. Therefore, the insertion portion 2c can be inserted inside the collar 6 and the washers 8U, 8L without resistance. Further, the collar 6 and the washers 8U and 8L cannot move in the axial direction of the rod 2 beyond the stopper portion 2b, and are supported by the stopper portion 2b.

With the collar 6 and the washers 8U and 8L supported by the stopper portion 2b in this manner, the end bolt 2d projects upward from the washer 8U on the upper side in FIG. 3, and the nut 9 is provided on the outer periphery of the portion. When the screw is screwed, the collar 6 and the washers 8U and 8L are clamped by the nut 9 and the stopper portion 2b and fixed to the outer periphery of the rod 2.

The outer diameter of the collar 6 is smaller than the diameter of the mounting hole b2, and the outer diameter of the washers 8U and 8L is larger than the outer diameter of the collar 6. Therefore, with the collar 6 mounted on the outer periphery of the rod 2, the rod 2 can be inserted into the mounting hole b2 without resistance. Further, in the state where the washers 8U and 8L are stacked above and below the collar 6, the upper washer 8U abuts on the upper end of the upper rubber bush 7U in FIG. 3, and the lower washer 8L corresponds to the lower rubber bush 7L. Contact the bottom edge.

The pair of rubber bushes 7U and 7L have a common configuration, are annular, and have a mortar shape in which the inner diameter and the outer diameter are gradually increased from one end side to the other end side in the axial direction, It has elasticity. The rubber bushes 7U and 7L are respectively inserted into the recesses formed in the mounting portion b1 so that the opening sides (large diameter sides) face each other, and the rubber bushes 7U and 7L are arranged so as to sandwich the inner peripheral edge portion b3 from the inside and outside of the vehicle body B.

When no load is applied to the rubber bushes 7U, 7L and the rubber bushes 7U, 7L have a natural length, the axial lengths of the pair of rubber bushes 7U, 7L and the plate thickness of the inner peripheral edge portion b3 are added together. Is longer than the axial length of the collar 6. Therefore, when the nuts 9 are screwed in until the upper and lower washers 8U, 8L come into contact with both ends of the collar 6 in FIG. 3, the upper and lower rubber bushes 7U, 7L are compressed between the mounting portion b1 and the upper and lower washers 8U, 8L. To be done.

Therefore, if the nut 9 is screwed in until the upper and lower washers 8U and 8L in FIG. 3 come into contact with the collar 6 with the shock absorber A attached to the vehicle body B, the shock absorber A is not loaded. The rubber bushes 7U, 7L are pre-compressed to give the rubber bushes 7U, 7L an initial deflection. Further, when the upper and lower washers 8U, 8L come into contact with the collar 6 in FIG. 3, the rubber bushes 7U, 7L are no longer compressed. Can be set.

In the state where the initial bending is applied in this way, the rubber bushes 7U and 7L have the inner periphery closely contacting the collar 6, the outer periphery closely contacting the step b4 of the mounting portion b1, and the outer periphery on the opening side at the inner peripheral edge b3. , And the inner peripheral portion on the closed side (small diameter side) comes into close contact with the washers 8U, 8L. That is, the inner peripheral portions of the rubber bushes 7U, 7L on the opening side are separated from the inner peripheral edge portion b3, and annular spaces 70, 71 are formed between them so as to surround the collar 6. In FIG. 3, a space formed between the upper rubber bush 7U and the mounting portion b1 is an upper space 70, and a space formed between the lower rubber bush 7L and the mounting portion b1 is a lower space 71. The spaces 70 and 71 are communicated with each other through the mounting hole b2 and form a continuous room R.

The hole 6a is formed in the center of the collar 6 in the axial direction, penetrates the thickness of the collar 6, and communicates the inside and outside of the collar 6. The length of the hole 6a in the vertical direction in FIG. 3 is longer than the plate thickness of the inner peripheral edge portion b3, and even if the hole 6a faces the upper and lower spaces 70, 71 and the rubber bushes 7U, 7L are compressed to the maximum extent. The length of the edge of the hole 6a is set so as not to reach the rubber bushes 7U and 7L. Further, as described above, the inner diameters of the collar 6 and the washers 8U and 8L are slightly larger than the outer diameter of the insertion portion 2c. Therefore, the room R communicates with the minute gap formed between the collar 6 and the washers 8U, 8L and the insertion portion 2c through the hole 6a, and communicates with the inside of the dust cover 5 through the gap.

The dust cover 5 is formed in a cylindrical shape with a bottom, and is arranged with the bottom portion 5a facing the vehicle body B side. The bottom portion 5a is formed with an insertion hole (not shown) that allows the insertion portion 2c of the rod 2 to be inserted, and the diameter of this insertion hole is smaller than the outer diameter of the stopper portion 2b. Slightly larger than diameter. Therefore, when the rod 2 is inserted into the insertion hole from the cylindrical portion 5b side of the dust cover 5 and the mounting member M is attached to the rod 2 protruding from the bottom portion 5a to the outside of the dust cover 5 and the nut 9 is tightened, the bottom portion 5a is removed. The dust cover 5 is fixed to the rod 2 by being sandwiched between the washer 8L and the stopper portion 2b.

The axial length of the dust cover 5 is set so that the outer shell 1 does not come out of the dust cover 5 even if the shock absorber body D is extended to the maximum extent. Therefore, the dust cover 5 covers the outer circumference of the rod body 2a of the rod 2 protruding from the outer shell 1, and the sliding surface of the rod body 2a is damaged by flying stones from the road surface, or the sliding surface is soiled, sandy, or dusty. It is possible to prevent the adhesion of foreign matter such as.

Further, as shown in FIG. 2, a gap is formed between the cylindrical portion 5b of the dust cover 5 and the outer shell 1. Therefore, even if the shock absorber A expands and contracts and the outer shell 1 moves in and out of the dust cover 5, the inside of the dust cover 5 is maintained at substantially atmospheric pressure. As described above, the bottom portion 5a of the dust cover 5 is sandwiched between the washer 8L and the stopper portion 2b, but since air is not sealed between them, air can pass therethrough.

Therefore, the air in the room R formed between the rubber bushes 7U and 7L facing each other and the air in the dust cover 5 are the holes 6a, the collar 6 and the insertion portion 2c, the lower washer 8L and the insertion portion 2c. And between the bottom portion 5a of the dust cover 5 and the insertion portion 2c and the stopper portion 2b. That is, the room R communicates with the inside of the dust cover 5 through the hole 6a and the gap formed between the collar 6 and the rod 2, and the air in the room R is released to the atmosphere. Is not sealed.

Hereinafter, the operation of the shock absorber A according to the present embodiment will be described.

When an external force is input to the shock absorber A attached to the vehicle body B in a direction to extend the shock absorber A, the rod 2 is pulled downward with respect to the vehicle body B in FIG. 3. Then, the upper rubber bush 7U in FIG. 3 is compressed and the lower rubber bush 7L is expanded. Further, when the direction in which the external force acts is reversed, the rod 2 is pulled up with respect to the vehicle body B in FIG. Then, the lower rubber bush 7U in FIG. 3 is compressed and the upper rubber bush 7L is expanded. Thus, in the case where the rubber bushes 7L and 7U expand and contract, and the difference in the amount of compression between the rubber bushes 7L and 7U increases, the volume of the room R formed between them decreases, and In addition, the volume of the room R increases in the process in which the difference between the compression amounts of the rubber bushes 7L and 7U becomes small.

In the shock absorber A, the room R is communicated with the inside of the dust cover 5 and is not hermetically sealed. Therefore, even if the volume of the room R is increased, the negative pressure does not occur and water is not sucked into the room R. Further, since the dust cover 5 prevents water from entering the inside of the dust cover 5, when the air (outside air) moves from the inside of the dust cover 5 to the room R, water flows into the room R together with the air. Can be more reliably prevented from entering the passenger compartment.

Hereinafter, the function and effect of the shock absorber A according to the present embodiment will be described.

In the present embodiment, the hole 6a is provided at a position that does not touch the rubber bushes 7U and 7L. Therefore, when the rubber bushes 7U and 7L are elastically deformed, they do not interfere with the edge of the hole 6a and are not damaged. Further, since the hole 6a is provided in the center of the collar 6 in the axial direction, the collar 6 cannot be polarized, and the rubber bushes 7U and 7L can be prevented from being damaged by the wrong assembly of the collar 6. Further, since the pair of rubber bushes 7U and 7L are common, it is possible to prevent the rubber bushes 7U and 7L from being damaged by the wrong assembly of the rubber bushes 7U and 7L.

The number, position, and shape of the holes 6a can be appropriately changed according to the rubber bushes 7U, 7L, and the pair of rubber bushes 7U, 7L need not be common. Further, although the hole 6a faces both of the spaces 70 and 71, the hole 6a may face only one of the spaces unless the space between the collar 6 and the inner peripheral edge portion b3 is sealed. Furthermore, although the washer 8U on the upper side in FIG. 3 is separate from the nut 9, they may be integrally formed as one component. Similarly, the washer 8L on the lower side in FIG. 3 is a separate body from the dust cover 5, but they may be integrally formed as one component.

Further, in the present embodiment, the shock absorber A includes a dust cover 5 that covers the outer periphery of the rod 2 that projects to the outside of the outer shell 1, and the room R communicates with the inside of the dust cover 5. Since water does not enter the inside of the dust cover 5, according to the above configuration, it is possible to more reliably prevent water from entering the room R and prevent water from entering the vehicle interior. Can be prevented more reliably. Furthermore, a groove or the like may be formed in a portion where the dust cover 5 and the stopper portion 2b face each other, a portion where the collar 6 and the insertion portion 2c face each other, and the like to facilitate passage of air.

In the present embodiment, since the upper washer 8U in FIG. 3 and the nut 9 are not sealed, the room R has the hole 6a, the gap between the collar 6 and the insertion portion 2c, and the washer. It is also communicated with the interior of the vehicle through a gap between the 8U and the nut 9. Therefore, the communication between the room R and the inside of the dust cover 5 may be blocked, and only the communication between the room R and the vehicle interior may be allowed.

Further, if sound is produced when the air moves between the room R and the passenger compartment, it may be perceived as an abnormal sound by the passengers. Therefore, the passage communicating between the room R and the passenger compartment may be widened. The generation of sound may be prevented, or the communication between the room R and the vehicle interior may be blocked so that the room R is communicated only with the dust cover 5 side. In this way, when the communication between the room R and the vehicle interior is cut off, for example, as shown in FIG. 4, the O-ring 60 is attached to the annular groove provided in the upper inner peripheral portion of the collar 6, and the rod 2 is attached. It is preferable to close the upper opening of the gap formed between the collar 6 and the collar 6. In this case, even if water intrudes into the room R, it can be prevented that the water moves into the vehicle interior. And these changes are possible regardless of the structure of the hole 6a, the rubber bushes 7U and 7L, and the washers 8U and 8L.

Further, in the present embodiment, the room R is communicated with the outside of the shock absorber A through the hole 6 a and the gap formed between the collar 6 and the rod 2. Since the gap between the collar 6 and the rod 2 also exists in the conventional shock absorber, according to the above configuration, it is not necessary to newly form a passage for communicating the hole 6a to the outside of the shock absorber A, The manufacturing cost of the shock absorber A can be reduced. Note that, for example, a passage may be formed inside the rod 2 for communicating the hole 6a with the inside of the dust cover 5 or the vehicle interior, and the configuration for communicating the hole 6a with the outside of the shock absorber A can be appropriately changed. .. The change can be made regardless of the configurations of the hole 6a, the rubber bushes 7U and 7L, and the washers 8U and 8L.

Further, in the present embodiment, the shock absorber A is interposed between the vehicle body B and the wheel W of the four-wheeled vehicle (vehicle) V, and includes the outer shell 1 and the rod 2 that goes in and out of the outer shell 1. A shock absorber body D, a tubular collar 6 mounted on the outer periphery of the rod 2, and a pair of annular rubber bushes 7U, 7L mounted on the outer periphery of the collar 6 for sandwiching the mounting portion b1 of the vehicle body B. Equipped with. The inner circumferences of the rubber bushes 7U, 7L are expanded in diameter toward the mounting portion b1 side, and a room R is formed between the pair of rubber bushes 7U, 7L. Further, the collar 6 is formed with a hole 6 a penetrating the thickness of the collar 6. The room R is communicated with the outside of the shock absorber A through the hole 6a. The state in which the hole 6a and the outside of the shock absorber A communicate with each other here means a state in which at least movement of air is permitted, and according to the configuration, the air in the room R is released to the atmosphere. Since the room R does not become a closed state, even if the room R is expanded, the inside of these does not become negative pressure. Therefore, the inside of the room R becomes a negative pressure and the water is not sucked into the spaces 70 and 71, so that the water sucked into the room R can be prevented from entering the passenger compartment.

Although the preferred embodiments of the present invention have been described in detail above, modifications, variations, and changes can be made without departing from the scope of the claims.

A... shock absorber, B... vehicle body, b1... attachment part, D... shock absorber main body, R... room, V... four-wheeled vehicle (vehicle), W... wheel 1... Outer shell, 2... Rod, 5... Dust cover, 6... Collar, 6a... Hole, 7U, 7L... Rubber bush

Claims (4)

It is interposed between the vehicle body and wheels,
A shock absorber body having an outer shell and a rod that goes in and out of the outer shell,
A cylindrical collar attached to the outer circumference of the rod,
A pair of annular rubber bushes that are attached to the outer periphery of the collar and sandwich the mounting portion of the vehicle body;
The inner circumference of the rubber bush is increased in diameter toward the mounting portion side, and a chamber is formed between the pair of rubber bushes,
The collar has a hole penetrating the wall thickness of the collar,
The shock absorber characterized in that the room communicates with the outside through the hole. The shock absorber according to claim 1, wherein the chamber is communicated with the outside through a gap formed between the hole and the collar and the rod. A dust cover for covering the outer circumference of the rod protruding to the outside of the outer shell,
The shock absorber according to claim 1 or 2, wherein the room is communicated with the inside of the dust cover. The shock absorber according to any one of claims 1 to 3, wherein the hole is provided at a position that does not cover the rubber bush.

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