JPH0520928Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in the mounting structure of an elastic seal member used in hydraulic equipment.

(Prior Art) In a hydraulic shock absorber, for example, as shown in FIG. 3, a dust seal 3 made of an elastic material is provided between a cylinder member 10 and a piston rod 11 slidably inserted therein,
This prevents dust attached to the surface of the cylinder member 10 from entering the inside of the cylinder member 10. This dust seal 3 is attached to a bearing 1 that supports a piston rod 11 via a metal member 2 as shown in FIG. The metal member 2 is formed into a cap shape that matches the outer shape of the bearing 1, and has an opening in the center thereof through which the piston rod 11 is inserted. On the other hand, the dust seal 3 is attached to the metal member 2 with its proximal end 3A having an annular cut formed therein so as to sandwich the periphery of the opening from above and below.

The dust seal 3 is secured to the bearing 1 by press-fitting the metal member 2 into the outer periphery of the bearing 1 from above in the figure, and is attached to the surface by sliding the tip 3B extending in a lip shape onto the piston rod 11. remove the dust.

(Problem to be Solved by the Invention) Incidentally, in order to completely remove dust, the dust seal 3 must be brought into close contact evenly around the piston rod 11, but this dust seal 3 must be attached to the base attached to the metal member 2. Since the end portion 3A is compressed with the bearing 1 when the metal member 2 is press-fitted, it may deform as shown in FIG. 5, causing the tip portion 3B to separate from the piston rod 11 or reduce the adhesion force. There was a risk that the dust could not be removed sufficiently.

The present invention aims to solve such problems that occur in the dust seal portion of hydraulic equipment by providing a seal member mounting structure that can securely fix the dust seal to the bearing without deforming it.

(Means for Solving the Problems) The present invention forms an opening through which a sliding member passes through the center of a cap-shaped metal member made of a thin metal material, and also forms an opening through which a sliding member passes through the base end of an elastic cylindrical dust seal. A seal in which an annular groove is formed on the outer periphery of the part, the annular groove is fitted into the opening, and the metal member is press-fitted and held on the outside of a bearing that supports the sliding member to lock the dust seal to the bearing. In the member mounting structure, in order to secure a gap for accommodating the clamped portion of the base end of the dust seal on the facing surface of the press-fitted metal member and the bearing, the metal member is provided with means for regulating the contact position with the bearing. Established.

(Function) When the metal members are press-fitted into the bearing, the base end portion of the dust seal held between the metal members in the storage gap is not excessively compressed, and its deformation is prevented.

(Example) FIG. 1 shows a first embodiment of the present invention.

1 is a bearing, 2 is a metal member press-fitted into the bearing 1 in a cap shape, and 3 is a dust seal made of an elastic material formed into a lip shape. dust seal 3
is attached to the metal member 2 in such a way that the base end portion 3A sandwiches the periphery of the opening formed in the center of the metal member 2 from above and below, and the metal member 2 is attached to the outer peripheral portion 1 of the bearing 1.
It is attached to the bearing 1 by press-fitting into B. In order to secure a gap in the bearing 1 to accommodate the base end 3A of the dust seal 3, the press-fitting part 2A of the metal member 2 is formed longer than the corresponding outer peripheral part 1B of the bearing 1, and the tip of the press-fitting part 2A is attached to the bearing 1. By restricting the press-fitting of the metal member 2 when it comes into contact with the base end 1C of the dust seal 3, a thickness corresponding to the base end 3A of the dust seal 3 is formed on the facing surface of the metal member 2 and the bearing 1 when the press-fit is completed. A gap is formed.

Next, the action will be explained.

The dust seal 3 is secured to the bearing 1 by press-fitting the metal member 2 into the outer circumference 1B of the bearing 1 from above in the figure.
The process is completed when the tip of A comes into contact with the base end 1C,
At this time, the base end 3A of the dust seal 3 is accommodated in the gap provided between the metal member 2 and the tip of the bearing 1.

Therefore, there is no risk that the base end 3A will be compressed and deformed between it and the bearing 1 during press-fitting, and the dust seal 3 is attached to the bearing 1 while maintaining its original shape, so the tip seal of the attached dust seal 3 The portion 3B is in uniform and sufficient contact with the piston rod.

Next, FIG. 2 shows a second embodiment, in which a stepped portion 2B is formed at the top of the metal member 2. Press-fitting of the metal member 2 is restricted when the stepped portion 2B comes into contact with the tip of the bearing 1, and the base end 3 of the dust seal 3
A is stored in the gap created inside this step 2B.

Therefore, in this second embodiment as well, deformation of the dust seal 3 during press-fitting can be prevented as in the first embodiment.

(Effects of the invention) As described above, the present invention secures a gap on the opposing surfaces of these metal members to accommodate the clamped portion of the base end of the dust seal when a metal member equipped with an elastic dust seal is press-fitted into a bearing. Due to the provision of the means, the dust seal is not subjected to deforming forces from metal parts and bearings. That is,
The dust seal can be held in its proper shape on the bearing without being deformed, thus ensuring its sealing function.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a dust seal mounting part showing a first embodiment of the present invention, Fig. 2 is a sectional view of a dust seal mounting part showing a second embodiment, and Fig. 3 is a sectional view of a hydraulic shock absorber showing a conventional example. 4 are enlarged cross-sectional views of the dust seal mounting portion, and FIG. 5 is a cross-sectional view showing a deformed state of the dust seal in the conventional example. DESCRIPTION OF SYMBOLS 1... Bearing, 1A... Base end part, 2... Metal member, 2A... Press-fitting part, 2B... Step part, 3...
...Dust seal, 3A...Proximal end.

Claims (1)

[Scope of utility model registration request] An opening through which the sliding member passes is formed in the center of a cap-shaped metal member made of a thin metal material, and an annular groove is formed on the outer periphery of the proximal end of an elastic cylindrical dust seal. In a seal member mounting structure in which the metal member is fitted into an opening and then press-fitted and held on the outside of a bearing that supports the sliding member to lock the dust seal to the bearing, the press-fitted metal member and the bearing are A mounting structure for a seal member, characterized in that the metal member is provided with means for regulating a contact position with a bearing in order to secure a gap for accommodating the clamped portion of the base end of the dust seal on the opposing surface of the seal member.