JPH0311468Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a mounting structure for a shock absorber, and more specifically, the present invention relates to a shock absorber mounting structure, and more specifically, a shock absorber, which is a strut of a strut-type suspension of an automobile, and a coil spring arranged around the shock absorber. It also relates to a structure that is attached to a vehicle body.

[Prior Art] In a strut type suspension, a coil spring is arranged surrounding a shock absorber, and these are attached to the vehicle body via a support.
The support is equipped with a rubber mount and holds the shock absorber and coil spring insulated from the vehicle body.

[Problems to be solved by the invention] Conventionally, the force transmitted from the shock absorber and the coil spring was input to a common part of the rubber mount, so the spring constant of the rubber mount was set large, which resulted in the shock The rubber mount was difficult to deform in response to minute displacement input from the absorber. As a result, absorption of small inputs was insufficient, and small vibrations were transmitted to the vehicle body.

In the McPherson strut type suspension disclosed in Japanese Utility Model Application Publication No. 57-33509, the support is a pair of elastic supports placed outside the rubber mount with a sleeve sandwiched between the reduced diameter part of the piston rod of the shock absorber. A pair of elastic bodies absorbs minute inputs from the shock absorber. Although this support achieves the original purpose, the number of parts increases, and assembly of the shock absorber to the support is relatively complicated.

Therefore, an object of the present invention is to provide a shock absorber mounting structure that can absorb minute displacement input from the shock absorber, does not increase the number of parts, and improves ease of assembly.

[Means for Solving the Problem] The present invention has a structure in which a piston rod of a shock absorber is attached to a vehicle body via a support together with a coil spring disposed surrounding the shock absorber, and the support is attached to the vehicle body. a support member to be coupled; a spring seat for receiving the upper end of the coil spring, the spring seat being disposed at a distance from the support member in the axial direction of the piston rod without contacting the support member; the spring seat being disposed within the spacing; and a rubber mount having a generally cylindrical shape fixed to the support member and the spring sheet, having a connecting portion capable of shearing deformation on its inner peripheral edge, and two stopper portions for regulating shearing deformation of the connecting portion. and a rubber mount provided with a gap from the connecting portion in the axial direction of the piston rod, the piston rod is coupled to the connecting portion of the rubber mount, and the spring seat compressively deforms the rubber mount.

[Examples] Examples of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the mounting structure 10 mounts a piston rod 14 of a shock absorber 12 and a coil spring 16 disposed around the shock absorber 12 to a vehicle body 20 via a support 18. Yes, the shock absorber 12 is a strut.

The shock absorber 12 has a cylinder 22, a piston (not shown) slidably disposed within the cylinder, and a lower end coupled to the piston and an upper end extending outwardly through an opening in the cylinder 22. The piston rod 14 is provided with a protruding piston rod 14. A steering knuckle (not shown), which is known per se, is mounted on the cylinder 22 and a suspension arm (not shown) is connected to the steering knuckle. The cylinder 22 is provided with a spring seat 24 that receives the lower end of the coil spring 16.

The support 18 includes a support member 26 and a coil spring 1.
6 and a rubber mount 30.

The support member 26 is generally dish-shaped and has an opening 32 at the top and a flange 33 at the bottom. A plurality of bolts (two are shown in the figure) 34 are inserted into this flange 33 at intervals in the circumferential direction, and the bolts 34 are passed through holes in the vehicle body 20, and nuts 35 are screwed into the bolts 34. So, support member 2
6 is fixed to the vehicle body 20.

The spring seat 28 is spaced apart from the support member 26 in the axial direction of the piston rod 14.
6 in a non-contact manner, and is configured so that the force from the coil spring 16 is not directly transmitted to the vehicle body.

In the illustrated embodiment, the spring seat 28 has a rubber insulator 36 on its lower surface, and receives the upper end of the coil spring 16 via the insulator 36. On the other hand, as shown in FIG. 2, the spring sheet 24 has a rubber insulator 3 on its upper side.
8, and receives the lower end of the coil spring 16 via the insulator 38.

The rubber mount 30 is formed into a cylindrical shape as a whole, and is disposed within the interval formed by the support member 26 and the spring sheet 28, and is attached to the support member 26 and the spring sheet 28 by vulcanization adhesion, adhesive adhesion, or the like. Fixed. The rubber mount 30 has a shear deformable connecting portion 42a on the inner peripheral edge, and two stopper portions 42b and 42c for regulating shear deformation of the connecting portion 42a prevent a gap from the connecting portion 42a in the axial direction of the piston rod 14. It is provided at

In the illustrated embodiment, the rubber mount 30 is vulcanized and bonded to the support member 26 at its upper outer peripheral surface and upper surface, to the spring sheet 28 at its lower outer peripheral surface and lower surface, and is vulcanized to the spring sheet 28 at its lower outer peripheral surface and lower surface. It has two slits 40 spaced apart vertically in the circumferential direction. As a result, the connecting portion 42a is attached to the inner peripheral edge of the rubber mount 30.
A lower stopper portion 42b and an upper stopper portion 42c are positioned with a gap formed by the slit 40 from the connecting portion 42a. The lower stopper portion 42b of the rubber mount 30 also serves to support the spring seat 28.

A cylindrical collar 44 is fixed to the inner peripheral surface of the connecting portion 42 of the rubber mount 30, and is attached to the piston rod 1.
The upper end of 4 is penetrated by a collar 44.
The piston rod 14 is connected to the support 18 by threading a nut 46 onto the end of the piston rod 14 passing through the collar 44 so that the collar 44 is clamped between the nut and the shoulder of the piston rod 14.

As a result of the piston rod 14 being coupled to the connecting portion 42a of the rubber mount 30 and the spring seat 28 being fixed to the stopper portion 42b of the rubber mount 30, a minute displacement input from the piston rod 14 is caused by shearing deformation of the connecting portion 42a. Absorbed. On the other hand, the input from the coil spring 16 is transmitted to the rubber mount 30 via the spring sheet 28,
This is absorbed by the compressive deformation of the rubber mount 30. In general, the spring constant of a rubber mount due to shear is extremely small compared to the spring constant due to compression. It is possible to set the spring constant of the connecting portion 42a to be sufficiently small so as to be effective for inputting minute displacements from the shock absorber 12.

[Operations of the Embodiment] When a minute vertical force is applied to the shock absorber 12 and the piston rod 14 makes a minute displacement, the connecting portion 42a of the rubber mount follows the displacement and undergoes shear deformation, thereby damping the minute input. At this time, the spring constant of the rubber mount 30 is extremely small because it is a shear spring constant of only the connecting portion 42a.

When the displacement of the piston rod 14 becomes larger and the connecting portion 42a comes into contact with, for example, a stopper 42c, the connecting portion 42a begins to be compressively deformed together with the stopper portion 42c, and the spring constant becomes larger than the shearing spring constant. .

When a large input is applied to the shock absorber 12,
When a large displacement enters the rubber mount 30 from the cylinder 22 of the shock absorber 12 through the coil spring 16 and the spring seat 28, the rubber mount 30
is compressed and deformed as a whole.

In the rubber mount described in the embodiment, the relationship between the displacement x of the piston rod 14 and the axial force F is the shear spring constant of only the connecting portion 42a when the displacement is small, and as the displacement increases, the
a and the stopper portion 42c, and finally the compression spring constant of the entire rubber mount 30, resulting in a curve like curve A in FIG. On the other hand, in the conventional case where the forces from the piston rod and the coil spring are input to a common portion of the rubber mount, curve B is obtained. Thus, it can be seen that the connecting portion 42a is particularly effective against minute displacements.

[Effect of the idea] According to the present invention, the following effects can be obtained.

A connecting part is provided on the inner peripheral edge of the rubber mount, and the shear deformation of this connecting part attenuates the minute displacement input from the shock absorber, which prevents minute vibrations from being transmitted to the vehicle body and improves riding comfort. .

Since shear deformation of the connecting portion of the rubber mount is restricted by the stopper portion, it is easy to achieve both riding comfort and stability. .

Since the large input from the shock absorber is received by the compression of the rubber mount, the resistance to the large input can be made sufficiently large, and the steering stability can be improved.

The support member that is coupled to the vehicle body and the spring sheet that receives the upper end of the coil spring are each fixed to the rubber mount and are formed as one piece, so the number of parts is small.

With the piston rod connected to the connecting portion of the rubber mount, the upper end of the coil spring can be received by the spring seat, and the shock absorber and coil spring can be maintained in an assembled state. Therefore, since the assembly can be attached to the vehicle body, ease of assembly can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the mounting structure according to the present invention;
FIG. 2 is a front view showing the main parts of the suspension mounted by the mounting structure, and FIG. 3 is a diagram showing the characteristics of displacement and axial force. 10...Mounting structure, 12...Shock absorber,
14...Piston rod, 16...Coil spring, 18
...Support, 20...Vehicle body, 24, 28...Spring sheet, 26...Support member, 30...Rubber mount, 40
...Slit, 44...Color.

Claims (1)

[Scope of utility model registration request] The piston rod of the shock absorber is attached to the vehicle body through a support together with a coil spring disposed surrounding the shock absorber, and the support includes a support member coupled to the vehicle body, and a support member that connects the piston rod from the support member to the vehicle body. a spring seat for receiving the upper end of the coil spring, which is disposed at intervals in the axial direction of the coil spring without contacting the support member; The rubber mount has a cylindrical shape and has a shear-deformable connecting part on the inner peripheral edge, and two stopper parts for regulating shear deformation of the connecting part reduce a gap from the connecting part in the axial direction of the piston rod. a rubber mount provided at a shock absorber, the piston rod being coupled to the connecting portion of the rubber mount, and the spring seat compressing and deforming the rubber mount.