JPH03584Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an improvement in the mounting structure of a dust seal cap in a strut mount.

[Prior art]

Traditionally, caps used for suspension-type strut mounts include, for example,
As disclosed in Japanese Utility Model Publication No. 57-200406 and Japanese Utility Model Application No. 58-30051, a cylindrical inner cylinder is attached to the upper end of the piston rod housed in the strut so as to cover the ball bearing. A cap is fitted into the upper opening of the cylinder to prevent dust, mud, etc. from entering the inner cylinder.

However, conventional caps such as those mentioned above are provided with slits to ensure ease of attachment to the inner cylinder, and are integrally molded from synthetic resin to reduce costs. No particular measures were taken against the intrusion of muddy water, etc.

For this reason, for example, when driving with water or muddy water accumulated on the top of the strut mount, the strut mount may
If a gap is created between the cap and the inner cylinder due to deformation of the mount, water or muddy water may enter the inner cylinder through this gap, causing the ball bearing to rust or break. Ta.

Furthermore, as other known techniques, the devices disclosed in Japanese Utility Model Application Publication No. 59-10538 and Japanese Utility Model Publication No. 50-1215 have been proposed.

The invention described in Utility Model Application Publication No. 59-10538 is
A rubber layer is provided between the outer cylinder and the inner cylinder of the strut support section, and a cap that completely covers the opening of the outer cylinder is fitted into a cylindrical member provided at the tip of the piston rod, and a bolt is inserted into this cylindrical member. are screwed together and fixed. However, the strut insulator with this structure has a cylindrical member above the piston rod and uses this cylindrical member to fix the cap, which not only increases the size of the cap but also puts a lot of force on the cap. Because of this, it cannot be manufactured using synthetic resin molded products, and
It is necessary to process the upper end of the piston rod into a complicated shape, and there is also the problem that the number of parts increases. Furthermore, no technology is disclosed in which a layer of elastic material is formed on the inner and outer surfaces of the end of the inner cylinder, and the elastic force of this layer is utilized to securely engage the cap and improve sealing performance.

In addition, the idea described in Japanese Utility Model Publication No. 1215/1973 has a lower inner shell that expands downward at the top of the piston rod, and a dish-shaped structure that is laminated on the lower inner shell and expands upward. An elastic body is provided between an upper inner shell, the upper and lower inner shells, and an outer shell fixed to the vehicle body, and the opening of the upper inner shell is closed with a cap.

However, this strut mount structure requires a considerable number of members, such as the need for two upper and lower inner shells. And the important thing is
There is a problem in that water resistance is poor because an elastic layer made of rubber is formed between the upper inner shell and the cap, and the cap does not have a fitting part that tightly contacts the elastic layer. Furthermore, since the strut mount of this structure does not have upper and lower inner shells with ball bearings in between, there is a problem in that excessive force acts on the elastic body and damages the elastic body within a short period of time.

[Purpose of invention]

This invention was developed to solve the problem of muddy water entering the inner cylinder of the conventional device, and its purpose is to prevent water and muddy water from entering the inner cylinder. A rubber layer is formed on the upper end opening of the inner cylinder, and the rubber layer is pressed against the cap side that fits into this opening to form a lip that exerts a sealing function.This prevents muddy water and dust from entering. The present invention provides a structure for attaching a dust seal cap to a strut mount.

[Structure of the idea]

This invention to achieve the above object supports an inner cylinder with an open upper end via a ball bearing fixed to the tip of the piston rod, and an elastic material is placed between the inner cylinder and the outer cylinder on the vehicle body side. The elastic material covers the upper surface of the end of the inner cylinder and the inner surface near the opening, and the cap that closes the opening has an elastic material formed on the cap portion that closes the opening and the inner surface of the inner cylinder. This is a structure for attaching a dust seal cap in a strut mount, which is composed of a fitting part that fits into a material, and a lip part that protrudes from the end of this fitting part and presses into tight contact with the elastic material.

That is, the upper surface and part of the inner surface of the upper end of the inner cylinder supported by the end of the piston rod via a ball bearing are covered with a rubber layer fixed to the outer surface of the inner cylinder. The fitting part of the cap is fitted into a rubber layer formed on the inner surface, and the rubber layer is pressed and sealed by a lip provided on the fitting part.

[Example of idea]

Embodiments of this invention will be described below based on the accompanying drawings.

FIG. 1 shows a front view of a suspension type strut mount 1 in which this invention is implemented.
It consists of a lower arm 4 that supports the lower part of the shock absorber 2, a coil spring 7 installed between the upper seat 5 and the lower seat 6 provided on the shock absorber 2, and a mounting block 8 installed on the upper end of the strut 3. There is.

As shown in FIG. 2, the mounting block 8 has an inner cylinder 10 mounted on the upper end of the piston rod 9 of the shock absorber 2 via a ball bearing 9a, and a contact between the outer peripheral surface of the inner cylinder 10 and the vehicle body side (not shown). An elastic material (insulator) 12 made of hard rubber or the like is vulcanized and bonded between the outer cylinder 11 and the fixed outer cylinder 11, and a dust sealing cap 13 is detachably attached to the upper opening 10a of the inner cylinder 10. is covered with.

Further, as shown in FIG. 3, an elastic material (insulator) 12 provided on the outer peripheral surface of the inner cylinder 10 is wound around the inner peripheral wall of the upper end opening 10a of the inner cylinder 10. A seal portion 12a having a constant thickness is formed.

Further, as shown in FIGS. 3 and 4, the cap 13 has a head portion 13a and a fitting portion 13b that are integrally molded from a rubber material or the like.
A lip portion 14 is provided on the outer circumferential surface of the inner cylinder 10, and is always elastically in close contact with a seal portion 12a formed on the inner circumferential wall of the opening of the inner cylinder 10.

Therefore, when the cap 13 is fitted into the upper end opening 10a of the inner cylinder 10 as shown in FIG.
Since the seal portion 12a provided on the inner circumferential wall of the inner cylinder 10 and the lip portion 14 of the cap 13 are elastically in close contact with each other, the inside of the inner cylinder 10 is in a sealed state.

Therefore, even if the strut mount 1 is deformed when the vehicle is running, the lip portion 14 of the cap 13 follows the seal portion 12a of the inner tube 10 and is always in close contact with the inner circumferential wall of the inner tube 10 and the cap 13. There is no gap between them, and it is possible to effectively prevent water, muddy water, etc. that accumulates in the upper part of the strut mount 1 from entering into the inner cylinder 10.

[Effect of idea]

The mounting structure of the dust seal cap in the strut mount according to this invention supports an inner cylinder with an open upper end via a ball bearing fixed to the tip of the piston rod, and connects this inner cylinder with the outer cylinder on the vehicle body side. An elastic material is provided between the inner tube and the inner tube, and the elastic material covers the upper surface of the end of the inner cylinder and the inner surface near the opening. It is composed of a fitting part that fits into an elastic material formed on the inner surface of the fitting part, and a lip part that protrudes from the end of this fitting part and presses into tight contact with the elastic material, and can provide the following effects.

The lip part provided on the cap fitting part is pressed into contact with the seal part made of elastic material that extends to the upper end and inner surface of the inner cylinder, so even if the strut mount is deformed while the vehicle is running, the inner part will not be damaged. The lip of the cap always follows and is in close contact with the seal provided at the upper opening of the cylinder.

Therefore, it is possible to prevent a gap from being formed between the upper end opening of the inner cylinder and the cap, and it is possible to prevent water, muddy water, and even dust that accumulates in the strut mount from entering the inner cylinder.

As a result, the life of the strut mount can be prevented from being shortened due to rusting or damage to the ball bearings accommodated in the inner cylinder.

This idea achieves the above effect by simply extending the conventional sealing part made of an elastic material to the upper end of the inner cylinder and the inner surface near this upper end, and slightly changing the shape of the fitting part of the cap to form a lip. Therefore, even slight improvements can bring about great effects.

[Brief explanation of the drawing]

Figure 1 is a front view of a strut mount implementing this invention, Figure 2 is an enlarged sectional view of the mounting block in Figure 1, and Figure 3 is an enlarged sectional view of section A in Figure 2. , FIG. 4 is a perspective view of the cap. 1... Strut mount, 9... Piston rod, 10... Inner cylinder, 10a... Opening, 12
...Elastic material, 12b...Seal part, 13...Cap, 13b...Fitting part, 14...Lip part.

Claims (1)

[Scope of utility model registration request] An inner cylinder with an open top end is supported via a ball bearing fixed to the tip of the piston rod.
An elastic material is provided between this inner cylinder and the outer cylinder on the vehicle body side,
The elastic material covers the upper surface of the end of the inner cylinder and the inner surface near the opening, and the cap that closes the opening has a cap that closes the opening and an elastic material formed on the inner surface of the inner cylinder. A structure for attaching a dust seal cap to a strut mount, comprising a fitting part that fits together, and a lip part that protrudes from the end of the fitting part and presses tightly against the elastic material.