KR20160107984A - Shock absorber - Google Patents

Abstract

According to the present invention, a shock absorber comprises: a piston rod of which one end extended from the inside of a cylinder is coupled to an upper mount; a head cap coupled to the piston rod; a bumper rubber coupled between the head cap and the upper mount; and a dust cover coupled to one end of the head cap to cover the outside of the piston rod. The head cap comprises: an upper plate which is coupled to the piston rod, wherein one end of the dust cover is coupled to the circumferential portion; and an interval maintaining member provided to a lower portion of the upper plate and limiting the stroke length of the piston rod by coming in contact with an upper end of the cylinder when the piston rod performs compression stroke by at least the maximum buffer length of the bumper rubber.

Description

Shock absorber {SHOCK ABSORBER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber, and more particularly, to a shock absorber in which a gap holding member is positioned below a head cap to prevent a piston rod from undergoing a compression stroke at a maximum buffer length The present invention relates to a shock absorber capable of preventing a collision between body valves and thereby preventing breakage (cracking) of a piston rod and a valve valve, and preventing a ride feeling from being deteriorated due to an impact when the vehicle is running.

Generally, the shock absorber acts to suppress or attenuate vibration from the road surface, and absorbs the vibration energy of the vehicle body in the vertical direction while being mounted between the vehicle body or the frame and the wheel.

In addition, the shock absorber can reduce the dynamic stress at the corner of the vehicle body to increase the durability life, suppress the movement of the mass under the spring to secure the grounding property of the tire, suppress the attitude change due to the inertia force, .

The shock absorber includes a cylinder, a piston valve for compressing and tensioning the cylinder, and a piston rod having one end connected to the piston valve and the other end disposed outside the cylinder.

In addition, a bumper rubber for buffering an impact between the cylinder and the piston rod when reciprocating the cylinder, and a head cap coupled to the upper end of the cylinder for fixing the dust cover.

However, in the conventional shock absorber, since the distance between the piston valve and the body valve is narrower than the gap between the upper end of the cylinder and the lower end of the cap, when the piston rod performs the compression stroke with a length exceeding the maximum bumping distance of the bumper rubber, There is a fear that the body valve may collide with the piston rod and the body valve. In this case, there is a possibility that the piston rod and the body valve may be damaged, and the ride feeling may be lowered due to the impact generated when the vehicle is running.

A prior art related to the present invention is Korean Patent Publication No. 10-2000-0052088 (Aug. 16, 2000), which discloses a vehicle shock absorber.

An object of the present invention is to provide a method for preventing a collision between a piston rod and a body valve by placing a gap holding member at a lower portion of a head cap so that the piston rod does not undergo a compression stroke at a maximum buffer length And it is an object of the present invention to provide a shock absorber which can prevent breakage (cracking) of a piston rod and a valve valve, and can prevent a riding feeling from being deteriorated due to an impact when the vehicle is running.

A shock absorber according to the present invention includes a piston rod having one end extended from the inside of a cylinder and coupled to an upper mount, a head cap coupled to the piston rod, a bumper rubber coupled between the head cap and the upper mount, And a dust cover coupled to the head cap at one end to cover the outside of the piston rod, wherein the head cap is coupled to the piston rod, And a gap holding member provided at a lower portion of the upper plate and contacting the upper end of the cylinder when the piston rod performs a compression stroke at a maximum buffer length of the bumper rubber or more, And a control unit.

Here, the upper plate has a cylindrical shape in which the piston rod is penetratedly coupled, the piston rod is penetratedly coupled to the piston rod, and a space is formed in a lower space. The lower end of the piston rod contacts the upper end of the cylinder, It is preferable to restrict the stroke length of the valve.

The lower end of the gap holding member is further formed with a support end bent outwardly, and the lower end of the support end is in contact with the upper end of the cylinder, thereby limiting the stroke length of the piston rod.

Meanwhile, the gap holding member may have a shape gradually decreasing in diameter toward the upper part, and may be coupled in a state in which the upper end is horizontally formed and closely attached to the lower end of the lower upper mount.

In the present invention, the gap holding member is positioned below the head cap to prevent the piston rod from undergoing a compression stroke at a maximum buffer length (limit length) of the bumper rubber, so that collision between the piston rod and the body valve can be prevented, It is possible to prevent damage (breakage or the like) of the rod and the valve, and to prevent the ride feeling from being deteriorated due to an impact when the vehicle is running.

1 is a front sectional view for showing a shock absorber according to the present invention.
2 is an enlarged cross-sectional view illustrating a shock absorber according to the present invention.
3 is a bottom perspective view showing the top plate and gap holding member of the head cap in the shock absorber according to the present invention.
FIG. 4 is a bottom view for showing an upper plate and a spacing member of a head cap in a shock absorber according to the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving it will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention.

FIG. 1 is a front sectional view showing a shock absorber according to the present invention, and FIG. 2 is an enlarged cross-sectional view illustrating a shock absorber according to the present invention.

3 is a bottom perspective view showing the top plate and the gap holding member of the head cap in the shock absorber according to the present invention.

FIG. 4 is a bottom view for showing the top plate and the gap holding member of the head cap in the shock absorber according to the present invention. FIG.

1 to 4, a shock absorber according to the present invention includes a cylinder 10, a piston rod 20, a piston 30, an upper mount 40, a bumper rubber 50, A dust cover 60, and a head cap 100. As shown in FIG.

A rod guide 70 coupled to the upper end of the cylinder 10 to allow the piston rod 20 to pass therethrough and a body valve 80 installed in the compression chamber of the cylinder 10 may be provided. In particular, the head cap 100 may be provided with the upper plate 100 and the gap holding member 120.

In the above-described configurations, the cylinder 10 may have a cylindrical shape forming a space therein, and a fluid (oil or the like) may be filled in the inner space of the cylinder 10.

The cylinder 10 can be applied to both a single-shaft type shock absorber having one cylinder 10 and a double-headed shock absorber having two cylinders 10.

For example, when the cylinder 10 is applied to the abdominal shock absorber, the cylinder 10 may be provided with an inner tube and an outer tube.

One end of the cylinder 10 and one end of the piston rod 20, which will be described later, can perform compression and tensile strokes while being connected to the vehicle body 1 side or the wheel side, respectively.

Further, a separate coupling portion (not shown) for connecting to the vehicle body 1 side or the wheel side may be provided at the lower end of the cylinder 10.

The piston rod 20 has one end coupled to the piston valve 50 and the other end extending to the outside of the outer tube and connected to the vehicle body 1 side or the wheel side of the vehicle.

In addition, a rod guide for guiding the piston rod 20 can be installed on the upper end of the cylinder 10.

The piston valve 30 divides the inside of the cylinder 10 into a compression chamber and a tension chamber and reciprocates in the compression and tensile directions in the cylinder 10 to generate a damping force due to the resistance of the fluid.

For example, when the piston valve 30 performs the compression stroke, the pressure of the lower compression chamber is higher than that of the upper tension chamber.

At this time, the fluid filled in the compression chamber due to the pressure rise of the compression chamber pushes the valve means through the flow passage and moves to the tension chamber. On the other hand, when the piston valve 30 performs the tension stroke, Lt; / RTI >

The upper mount 40 is for fixing the cylinder 10 to the vehicle body 1. The upper mount 40 is installed above the cylinder 10 and the upper mount 40 is fixed to the fastening member B To be fixedly coupled to the vehicle body 1.

Here, the upper mount 40 may be formed with a hollow vertically through the center so that the piston rod 20 can be inserted into the upper mount 40.

The insertion tube may be extended downward so that the bumper rubber 50, which will be described later, is fixedly installed in the hollow of the upper mount 40.

The bumper rubber 50 is vertically and vertically hollowed in the center so that the piston rod 20 can be inserted into the bumper rubber 50. The bumper rubber 50 is inserted into the insertion tube of the upper mount 40 .

At this time, the lower end of the bumper rubber 50 may extend further downward than the lower end of the upper mount 40, and the lower end of the bumper rubber 50 may be in close contact with the upper end of the upper plate 200 Can be installed.

The bumper rubber 50 may have a cylindrical shape and may be made of rubber or the like in order to cushion impact acting as a lower portion.

The bumper rubber 50 is provided between the upper mount 40 and the upper plate 200 to be described later. The bumper rubber 50 cushions shocks through compression and relaxation operations.

Of course, the mounting position, size, shape, etc. of the bumper rubber 50 can be variously applied depending on the type of the shock absorber to which the bumper rubber 50 is applied.

The rod guide 60 can be engaged in a state of blocking the upper end of the cylinder 10, and a hollow is vertically penetrated so that the piston rod 20 can be penetrated.

The dust cover 60 is provided to prevent foreign matter from flowing into the piston rod 20 disposed therein and thus to prolong the life of the device. The dust cover 60 has a hollow tube shape have.

Here, the dust cover 60 may have an engaging groove 61 formed along the inner circumference at one end thereof. The engaging groove 61 may be coupled to the upper plate 110 to be described later.

The upper plate 200 is in close contact with the lower end of the bumper rubber 50 while being coupled to the outside of the piston rod 20.

Here, the upper plate 110 may be made of a metal material, and one end of the dust cover 60 may be coupled to an edge of the upper plate 110.

As shown in FIG. 1, the edge of the upper plate 110 may be coupled to the engaging groove 61 of the dust cover 60 by male and female.

Of course, a coupling method between the edge of the upper plate 110 and the dust cover 60 can be variously applied.

3 and 4, the upper plate 110 may have a disc shape having a concave lower portion.

The first bent portion 111 and the second bent portion 112 may be formed at the edge of the upper plate 110. [

That is, the rim of the upper plate 110 is bent downward with respect to the first bent portion 111, and may have a shape in which the diameter gradually widens downward.

The second bent portion 112 may extend laterally from the first bent portion 111 horizontally to be coupled to the coupling groove 61 formed at one end of the dust cover 60.

In addition, a first through hole 113 is vertically formed through the center of the upper plate 110 so that the piston rod 20 can be coupled.

The gap holding member 120 is provided at a lower portion of the upper plate 200 and has a lower end when the piston rod 20 performs a compression stroke at a maximum buffer length (limit length) or more of the bumper rubber 50 10) to limit the stroke length of the piston rod (20).

Here, the gap holding member 120 may be integrally formed, or may be coupled to the lower end of the upper plate 200 using a combination of welding and fastening members.

The gap holding member 120 may have a cylindrical shape as shown in FIG. 4, and the gap holding member 120 may be made of a metal material or the like.

3 and 4, the space maintaining member 120 may have a cylindrical shape with a space 121 formed thereunder.

At this time, the gap holding member 120 is formed to have a diameter capable of engaging the upper end of the cylinder 100 from above.

In addition, a support end 122 bent to the outside may be further formed at the lower end of the gap holding member 120.

The supporting end 122 may be formed to be horizontally bent, and the bent end of the supporting end may be formed into a curved bent portion 123.

The lower end of the support end 122 contacts the upper end of the cylinder 10 when the piston rod 20 performs the compression stroke at a maximum buffer length (limit length) of the bumper rubber 50 or more.

At this time, since the cylinder 10 is in contact with the support end 122, the piston rod 20 no longer enters the interior of the cylinder 10.

In addition, a second through hole 124 is vertically formed in the central portion of the gap holding member 120 so that the piston rod 20 can be engaged.

That is, since the piston rod 20 is not moved beyond the maximum stroke length, the piston rod 20 and the body valve 80 provided in the cylinder 10 do not collide with each other, It is possible to prevent breakage (breakage or the like) of the valve 80, and it is possible to prevent the ride comfort of the vehicle from being lowered due to the collision.

2, the gap holding member 120 may have a gradually decreasing diameter, and an upper end of the gap holding member 120 may be formed horizontally and may be formed at a lower end of the upper plate 110 And can be joined in a tightly coupled state.

At this time, since the lower end of the gap holding member 120 is formed to have a larger diameter than the upper end, the shape of the gap holding member 120 can be deformed in the vertical direction by the impact applied from the support end 122.

In other words, the gap holding member 120 can be restored to its original shape after the shape deformation, thereby restricting the moving position of the cylinder 10, and at the same time, It is possible.

As a result, the present invention can prevent the piston rod 20 from moving beyond the maximum stroke length by engaging the gap holding member 120 for supporting the cylinder 10 at the lower portion of the upper plate 110. [

As a result, it is possible to prevent the piston rod 20 and the body valve 80 from being damaged (cracked) due to collision, and to prevent the ride feeling of the vehicle from being lowered due to the impact occurring at the time of running.

Although specific embodiments of the shock absorber of the present invention have been described above, it is apparent that various modifications can be made without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

It is to be understood that the foregoing embodiments are illustrative and not restrictive in all respects and that the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

1: Body 10: Cylinder
20: Piston rod 30: Piston valve
40: upper mount 50: bumper rubber
60: dust cover 61: engaging groove
70: Rod guide 80: Body valve
100: head cap 110: upper plate
111: first bent portion 112: second bent portion
113: first through hole 120: spacing member
121: space portion 122: support end
123: Bending section 124: Second through hole
B: fastening member

Claims (4)

A head cap coupled to the piston rod; a bumper rubber coupled between the head cap and the upper mount; and a bumper rubber coupled to the head cap at one end, And a dust cover to cover the outside of the piston rod,
The head cap includes: an upper plate coupled to the piston rod and having one end of the dust cover coupled to a rim portion; And
And a gap holding member provided at a lower portion of the upper plate and contacting the upper end of the cylinder to limit the stroke length of the piston rod when the piston rod performs a compression stroke at a maximum buffer length of the bumper rubber And a shock absorber. The method according to claim 1,
Wherein the upper plate comprises:
Wherein the piston rod is penetratingly coupled,
The space-
Wherein the piston rod has a cylindrical shape through which the piston rod is inserted and a space portion is formed at a lower portion thereof. The method of claim 2,
The lower end of the gap-
A support end bent and extended outward is further formed,
The supporting end may be,
And the lower end is in contact with the upper end of the cylinder. The method of claim 3,
The space-
And has a shape gradually decreasing in diameter toward the upper portion.

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