JP4092236B2 - Strut type shock absorber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a strut-type shock absorber composed of an outer tube and an inverted damper inserted into the outer tube, and more specifically, prevents collision noise between the outer tube and the damper cylinder during operation. Concerning structure.
[0002]
[Prior art]
Conventionally, as this type of strut type shock absorber, the one shown in Non-Patent Document 1 can be exemplified.
[0003]
This strut type shock absorber is composed of an outer tube and an inverted damper inserted into the outer tube. It has become.
[0004]
That is, an inverted damper cylinder having a mounting portion in an outer tube having a knuckle bracket is inserted in a retractable manner with a sliding gap, and a piston rod inserted in the damper cylinder in a freely retractable manner is connected to a lower portion of the outer tube. It is fixed to the part.
[0005]
The outer tube is connected to the axle side via a knuckle bracket, and the damper cylinder is connected to the vehicle body side via a mounting portion provided on the upper part thereof, so that the outer tube is used as a part of a link constituting an automobile suspension. ing.
[0006]
Therefore, in the operating state of this suspension, the damper cylinder repeatedly moves in and out from the outer tube according to the unevenness of the road surface, generating a predetermined damping force to prevent vibration from the road surface from being transmitted to the vehicle body side. ing.
[0007]
[Non-Patent Document 1]
Seiji Komamura 11 people, "Suspension of automobile", 1st edition, Sankai-do Co., Ltd., March 1991, P125, Fig. 4-66
[0008]
[Problems to be solved by the invention]
However, the above-described strut type shock absorber has the following problems.
[0009]
That is, since the strut type shock absorber originally functions as a link constituting the suspension, a large bending moment may be applied to the strut type shock absorber itself depending on the road surface condition or the like in the operation state of the suspension.
[0010]
The above bending moment affects the minute sliding gap between the outer tube and the damper cylinder. The damper cylinder outer peripheral surface may collide with the tube inner peripheral surface.
[0011]
Among these states, the collision of the outer peripheral surface of the damper cylinder with the outer peripheral surface of the outer tube may generate a loud collision sound depending on the state. In this case, it is heard by the driver and passengers as abnormal noise, which is uncomfortable. May make you think.
[0012]
Accordingly, an object of the present invention is to provide a strut-type shock absorber having a structure that does not generate a collision sound even when a damper cylinder collides with an outer tube.
[0013]
[Means for Solving the Problems]
To achieve the above object, the means of the present invention comprises an outer tube coupled to the axle side, and inverted damper inserted into the outer tube, damper is coupled to the vehicle body, the outer a damper Cylinders inserted slidably have any sliding gap via a bearing member provided on the inner peripheral surface of the outer tube into the tube, freely inserted and proximal infested in the damper cylinder da In a strut type shock absorber composed of a piston rod coupled to the outer tube side lower portion, a silencer member for preventing a collision sound generated when the bearing member collides with the damper cylinder is provided as an outer member adjacent to the bearing member. It is arranged on the inner peripheral surface of the tube, and the bearing member and the fixing member press-fitted into the outer tube It is characterized in that it has positioned and fixed sound member.
[0014]
In this case, the sound deadening member may be an elastic body made of natural rubber, synthetic rubber or synthetic resin.
[0015]
In addition, another sound deadening member may be provided near the tip of the outer tube .
[0016]
Further, the silencer member may be an O-ring, and the inner diameter of the O-ring may be set smaller than the inner diameter of the bearing member, and may always be in sliding contact with the outer peripheral surface of the damper cylinder.
[0017]
Furthermore, the silencing member is configured as a silencing ring composed of an annular substrate and an annular elastic body joined to the inner periphery thereof, and the annular substrate is press-fitted so as to come into contact with the inner week surface of the outer tube. May be fixed to the outer tube.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in an automobile strut type shock absorber will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a basic structure of the strut type shock absorber of the present invention. FIG. 2 is a partially enlarged cross-sectional view of FIG. 1 configured more specifically.
[0019]
That is, the shock absorber according to the present invention includes an outer tube 3 coupled to the axle side and an inverted damper D inserted into the outer tube 3. The damper D is coupled to the vehicle body side and the outer tube 3. On the other hand, a damper cylinder 5 slidably inserted through a bearing member provided on the inner peripheral surface of the outer tube 3, and a piston rod 6 inserted into the damper cylinder 5 through a piston P so as to be freely retractable. It is made up of.
[0020]
Furthermore, a free piston F is movably inserted into the damper cylinder 5, and the free piston F partitions the gas chamber G and the oil chamber R in the damper cylinder 5.
[0021]
More specifically, a damper cylinder 5 having a mounting portion (not shown) welded to the upper portion thereof is formed in a bottomed cylindrical outer tube 3 in which a knuckle bracket 1 is welded to the lower portion and a spring seat 2 is fixed to the upper portion. The piston rod 6 is inserted in a so-called inverted state so that it can be protruded and retracted, and the base end of the piston rod 6 inserted in the damper cylinder 5 is freely fixed to the lower portion 7 of the outer tube 3 by screws 8.
[0022]
A center-side bearing 11 and an upper-side bearing 12 as bearing members are press-fitted and fixed to the inner peripheral surface near the center and the upper portion of the outer tube 3, and the inner peripheral surfaces of these bearings 11 and 12 and the shock absorber By forming a minute sliding gap S between the outer peripheral surface of the main body 5, the buffer body 5 can smoothly move in and out.
[0023]
An O-ring 13 as a silencer member of the present invention is press-fitted into the inner peripheral surface of the outer tube 3 which is the lower part of the center-side bearing 11, and this O-ring 13 is press-fitted into the lower end of the bearing 11 and the lower part of the O-ring 13. The position is fixed by the upper end of the ring-shaped fixing member 14.
[0024]
The inner diameter of the O-ring 13 is set smaller than the inner diameter of the central bearing 11, and the inner peripheral side of the O-ring 13 is always in sliding contact with the outer peripheral surface of the damper cylinder 5. When the outer peripheral surface 5 collides, the buffering action is performed by the elastic force of the O-ring 13 so that no collision noise is generated.
[0025]
Another silencer ring 15 is press-fitted and fixed to the inner peripheral surface of the outer tube 3 that is the upper portion of the upper bearing 12.
[0026]
The muffler ring 15 includes an annular substrate 16 and an annular elastic body 17 made of natural rubber, synthetic rubber, or synthetic resin joined to the inner periphery thereof.
[0027]
The inner diameter of the elastic body 17 of the silencer ring 15 is set smaller than the inner diameter of the upper bearing 12, and the inner peripheral surface of the elastic body 17 is always in sliding contact with the outer peripheral surface of the damper cylinder 5. When the outer peripheral surface of the damper cylinder 5 collides with the bearing 12, a buffering action is performed by the elastic force of the elastic body 17 so that no collision noise is generated.
[0028]
A cylindrical dust seal case 22 in which a dust seal 21 is press-fitted and fixed to the upper inner peripheral surface 21 a is pressed into the upper opening end of the outer tube 3 by pressing the lower inner peripheral surface 21 b into the outer peripheral surface of the outer tube 3. It is fixed to the outer tube 3, and dust, dust, etc. attached to the outer peripheral surface of the damper cylinder 5 by the dust seal 21 do not enter the outer tube 3.
[0029]
In the figure, reference numeral 23 denotes a buffer rubber for preventing a direct collision between the damper cylinder and the lower portion 7 of the outer tube 3, and the damper cylinder 5 uses a single cylinder type hydraulic shock absorber.
[0030]
In the strut-type shock absorber configured as described above, the outer tube 3 is mounted on the axle side via the knuckle bracket 1 and the damper cylinder 5 is mounted with the coil spring (not shown) seated on the spring seat 2. When connected to the vehicle body side via the respective parts, they become part of the link constituting the suspension of the automobile.
[0031]
Accordingly, in this operating state of the suspension, the damper cylinder 5 repeats the projecting and retracting operation from the outer tube 3 according to the road surface unevenness, and the vibration from the road surface is transmitted to the vehicle body side by generating a predetermined damping force. It is preventing.
[0032]
In the operating state of this suspension, a large bending moment is applied to the strut type shock absorber itself depending on the road surface condition, etc., and the outer peripheral surface of the damper cylinder 5 instantaneously collides with the inner peripheral surface of the upper or central bearings 11 and 12. May generate sound.
[0033]
However, in the present embodiment, an O-ring 13 or other silencing ring 15 is provided in a portion adjacent to or close to both the bearings 11 and 12, and when the damper cylinder 5 contacts any of the bearings 11 and 12. Since the buffering action by the elastic force of the O-ring 13 and the other muffler ring 15 is surely received, the generation of the collision sound as described in the prior art can be surely prevented.
[0034]
In particular, since there is provided in a portion in contact next to the O-ring 1 3 medium Hisashigawa bearing 11 as sound deadening member, it is possible to perform a buffering action at the time of collision to said bearing 1 1 efficiently.
[0035]
In addition, since the elastic body 17 is used as the sound deadening member, it is possible to easily exhibit a buffering action with a simple structure to prevent the occurrence of a collision sound, to improve the assembling property, and to be implemented at a relatively low cost. Is possible.
[0036]
In addition, since the O-ring 13 and the muffler ring 15 are provided at two locations, the central portion and the upper portion of the outer tube 3, it is possible to reliably prevent the occurrence of collision noise regardless of the position of the damper cylinder 5 on the outer tube 3. be able to.
[0037]
Further, the silencer ring 15 provided in the vicinity of the upper bearing 12 is joined to the outer periphery of the annular elastic body 17 and the annular substrate 16 is joined, and the substrate 16 is press-fitted into the inner peripheral surface of the outer tube 3. Since it is fixed, it is not necessary to fix the position by providing another fixing member 14 like the O-ring 13 provided close to the central bearing 11. Therefore, not only the number of parts can be reduced, but also the fixing work to the outer tube 3 can be easily performed.
[0038]
In addition, this invention is not limited to the said embodiment, For example, it can also be changed as follows.
[0039]
1) The structure of muffling ring 15 provided near the upper side bearing 12, or a structure using an O-ring 13 provided in contact next to the center-side bearing 11, in contact next to the center-side bearing 11 in the opposite provided Alternatively, a structure using the O-ring 13 may be adopted on the upper bearing 11 side. In any case, if the structure of the noise preventing member is the same, the number of parts can be reduced and the assembly process can be simplified.
2) The O-ring 13 or the muffler ring 15 may be provided on both upper and lower sides of the upper bearing 12 and the center bearing 11. In this way, although the number of parts and assembly man-hours increase, a more reliable noise prevention effect can be obtained.
3) As a structure for fixing the O-ring 13 as another noise reduction member, as shown in FIG. 3 , an annular recess 24 is formed on the inner peripheral surface of the outer tube 3, and the O-ring 13 is fitted in the recess 24. good.
[0040]
【The invention's effect】
The present invention has the following effects.
[0041]
According to the present invention, in the operating state of the strut-type shock absorbers, also damper Cylinders the bearing member provided on the inner peripheral surface of the outer tube is a situation that generates collision noise and collision Since the cushioning action at the time of the collision can be reliably and efficiently performed by the muffling member disposed adjacent to the bearing member, it is possible to reliably prevent the occurrence of the collision sound.
[0042]
2) According to the invention of claim 2, since the elastic body made of natural rubber, synthetic rubber or synthetic resin is used as the sound deadening member, it is possible to easily exert a buffering effect with a simple configuration and prevent the occurrence of collision noise. At the same time, it is easy to assemble and can be implemented relatively inexpensively.
[0043]
3) According to the invention of claim 3, since the muffling members are provided at the central portion and the upper portion of the outer tube, it is possible to reliably generate a collision sound regardless of the position of the damper cylinder with respect to the outer tube. Can be prevented.
[0044]
4) According to the invention of claim 4, the inner peripheral side of the O-ring is always in sliding contact with the outer peripheral surface of the damper cylinder 5, so that the buffering action is performed by the elastic force of the O-ring and no collision noise is generated.
[0045]
5) According to the invention of claim 5, it is possible to easily fix the silencer to the outer tube.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing only a left part from a center line of a strut type shock absorber according to an embodiment of the present invention.
FIG. 2 is a partially enlarged cross-sectional view of FIG. 1 configured more specifically.
FIG. 3 is a cross-sectional view of an essential part showing another example of the present invention and showing only the left part from the center line.
[Explanation of symbols]
1 Knuckle bracket 3 Outer tube 5 Shock absorber body 6 Piston rod 7 Lower part 11 Center side bearing (bearing member)
12 Upper bearing (bearing member)
13 O-ring (silencer)
14 Fixing member 15 Silencer ring 16 Substrate 17 Elastic body S Sliding gap

Claims (5)

And the outer tube to be coupled to the axle side and a inverted damper inserted into the outer tube, the bearing damper provided with coupled to the vehicle body side, the inner peripheral surface of the outer tube into the outer tube strut consisting of a damper cylinder da inserted slidably have any sliding gap through the member, is inserted retractably into the damper Cylinders with a piston rod attached to the proximal end to the outer tube side lower portion In the type shock absorber, a silencing member for preventing a collision sound generated when the bearing member collides with the damper cylinder is disposed on the inner peripheral surface of the outer tube adjacent to the bearing member, and the bearing member; characterized by being positioned and fixed the silencing member and the fixing member which is pressed into the outer tube Trat type shock absorber.   The strut type shock absorber according to claim 1, wherein the sound deadening member is an elastic body made of natural rubber, synthetic rubber or synthetic resin. The strut type shock absorber according to claim 1 or 2, wherein the other sound deadening member is provided near the tip of the outer tube . The strut-type shock absorber according to claim 2, wherein the sound deadening member comprises an O-ring, and the inner diameter of the O-ring is set smaller than the inner diameter of the bearing member, and is always in sliding contact with the outer peripheral surface of the damper cylinder . The other silencing member is configured as a silencing ring composed of an annular substrate and an annular elastic body joined to the inner periphery thereof, and press-fitting the annular substrate so as to contact the inner peripheral surface of the outer tube, The strut type shock absorber according to claim 3, wherein the strut type shock absorber is fixed to the outer tube.

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