JP2545943Y2 - Seal case fixing structure - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a fixing structure of a seal case most suitable for use in a front fork or the like.

[Conventional technology and its problems]

As a fixing structure of a seal case in a front fork or the like, for example, there is a proposal according to Japanese Utility Model Laid-Open Publication No. 1-162891.

That is, the seal case has a seal closely fitted to the outer periphery of the press-fit end of a cylindrical body such as an outer tube housed in the inner periphery thereof. After the press-fit end is press-fitted inside the seal case, the seal case is It is configured such that a swaged end, which is an open end, is swaged.

Therefore, it is indispensable to form a fixing portion at the press-fit end of the cylindrical body, at which the inner periphery of the crimped end of the seal case is in close contact, so that the cylindrical body forms a fixing portion. The proposal according to the above-mentioned disclosure can be implemented when the member is formed to have a sufficient thickness in advance, for example, when the member is formed to be thick with an aluminum material.

That is, when the cylindrical body is formed of a thin iron material, it is difficult or impossible to form a fixing portion around the press-fit end of the cylindrical body. There are inconveniences that cannot be implemented.

This invention has been made in view of the above-described circumstances, and the purpose thereof is to fix the seal case around the press-fit end of a tubular body such as an outer tube when the tubular body is fixed. The seal case fixing structure that can be easily implemented even when it is made of a thin iron material as well as when it is made of a thick aluminum material, and is optimal for use in a front fork etc. It is to provide.

[Means for solving the problem]

In order to achieve the above-mentioned object, the configuration of the present invention is modified by installing a seal tightly attached to the outer periphery of a press-fit end of a cylindrical body such as an outer tube on the inner periphery thereof, and crimping the press-fit end after press-fitting the press-fit end. In a fixed structure of a seal case configured to be processed, a snap ring is fitted around a press-fit end of a cylindrical body such as an outer tube, and a spacer is interposed adjacent to the snap ring. Wherein the crimped end of the seal case is pressed against the outer periphery of the spacer by crimping so that the seal case is fixed to the outer periphery of the press-fit end of the cylindrical body. .

Then, it is assumed that a fixing portion to which the crimped end of the seal case is pressed against the outer periphery of the spacer is formed.

[Action]

The press-fit end of the tubular body is press-fitted inside the seal case, and at this time, the seal housed on the inner periphery of the seal case is brought into close contact with the outer periphery of the press-fit end, and a predetermined sealing effect is obtained.

After the press-fit end of the cylindrical body is press-fitted into the inside of the seal case, the swaged end, which is the opening end of the seal case, is crimped.

At this time, a snap ring is fitted around the outer periphery of the cylindrical body, and a spacer adjacent to the snap ring is interposed. The above-mentioned caulked end is caulked to a fixing portion formed on the outer periphery of the spacer. Pressed by processing.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment.

As shown in the drawings, a front fork according to one embodiment of the present invention is configured such that an insert 2 serving as an axle-side tube is inserted into a tubular body 1 serving as a vehicle-body-side tube so as to be able to protrude and retract. Although not shown, for example, it is assumed that a damping force generating section is provided in the insert 2 and a predetermined damping action is performed when the insert 2 is protruded and retracted in the tubular body 1.

The tubular body 1 is made of an iron material in this embodiment, and a lower end portion in the figure is a press-fit end 1a into the inside of the seal case 3.

The press-fit end 1a has a wall thickness of the cylindrical body 1 according to the present invention.
The thickness is the same as the thickness of the main body 1b, and the thickness is not set to be larger than the thickness of the main body 1b as in the conventional proposal.

A seal case 3 is fixedly provided on the outer periphery of the press-fit end 1a in a so-called post-attached form.

The seal case 3 has an opening end serving as an upper end in the figure as a swaged end 3a, and the swaged end 3a is bent inward during swaging.

The sealing case 3 is formed by caulking the caulking end 3a.
Can be fixed to the outer periphery of the press-fit end 1a.

The lower part of the seal case 3 in the figure is a storage portion 3b, and a bearing, a cap, a retaining ring, a dust seal, and the like (not shown) are housed in the inner periphery of the storage portion 3b. It is going to be.

The seal case 3 has a concave groove 3c on the inner periphery thereof, and a seal 4 made of an O-ring is provided in the concave groove 3c.
When the press-fit end 1a of the tubular body 1 is press-fitted inside the seal case 3, the seal 4
It is formed so as to be in close contact with the outer periphery of the press-fit end 1a.

When the seal case 3 is fixed to the press-fit end 1a, a snap ring 5 is fitted on the outer periphery of the press-fit end 1a in advance, and a spacer 6 is interposed so as to be adjacent to the snap ring 5. It is going to be.

That is, in the related art, when the snap ring 5 is fitted around the outer periphery of the press-fit end 1a, the swaged end 3a of the seal case 3 is swaged so that the snap ring 5 is directly wound. The case 3 is fixed to the press-fit end 1a.

However, in the present invention, it is assumed that the crimping end 3a of the seal case 3 is crimped on the outer periphery of the spacer 6 interposed so as to be adjacent to the snap ring 5, thereby forming the seal case 3. It is stated that fixation to the press-fit end 1a is performed.

That is, in the present invention, the press-fit end 1a of the cylindrical body 1 is not set to be particularly thick, but the thickness of the press-fit end 1a, particularly the caulking end
The spacer 3a is configured to increase the thickness of the portion to be pressed, and has a fixing portion 6a formed in a tapered shape on the outer periphery of the spacer 6.

Therefore, in the case of the seal case 3 according to the above-described embodiment, the press-fit end 1a of the cylindrical body 1 is press-fitted into the inside of the seal case 3 via the swaged end 3a which is an opening end of the seal case 3, and the swaged end 1a is formed. The press-fit end of the cylindrical body 1 of the seal case 3 is formed by crimping 3a so as to be bent inward.
Fixing to 1a becomes possible.

At this time, according to the connection method, the portion bent inside the crimping end 3a is pressed against the fixing portion 6a of the spacer 6 so as to be hooked on the spacer 6, so that the seal case 3 The fixation to the spacer 6, that is, the fixation to the tubular body 1 is reliably performed.

Further, since the fixing portion 6a of the spacer 6 is arranged at a distance from the outer periphery of the press-fit end 1a, the caulking jig collides with the outer periphery of the press-fit end 1a during the caulking of the caulked end 3a. And the crimping operation is not hindered.

[Effect of the invention]

As described above, according to the present invention, even if the press-fit end of the cylindrical body to be press-fitted inside the seal case is not formed thick, the crimped end is crimped to form the outer periphery of the press-fit end of the seal case. Of course, it is possible to fix
The crimped end is so-called hooked on the spacer, which is advantageous in that the seal case can be securely fixed to the spacer.

Further, according to the present invention, since the fixing portion of the spacer is disposed at a distance from the outer periphery of the press-fit end, when the crimping end is crimped, the press-fit end, that is, the outer periphery of the cylindrical body is crimped. There is also an advantage that the tool does not collide and the crimping work is not hindered.

[Brief description of the drawings]

The drawing is a partially enlarged front view showing a front fork according to an embodiment of the present invention, partially cut away. [Description of Signs] 1 ... Cylindrical body, 1a ... Press-fit end 3 ... Seal case, 3a ... Caulking end 4 ... Seal, 5 ... Snap ring 6 ... Spacer, 6a ... Fixing section

Claims (1)

(57) [Scope of request for utility model registration] 1. A seal closely fitted to the outer periphery of a press-fit end of a cylindrical body such as an outer tube is housed on the inner periphery thereof, and the crimped end is crimped after the press-fit of the press-fit end. In the fixing structure of the seal case, a snap ring is fitted around the press-fit end of the cylindrical body such as the outer tube and a spacer is interposed adjacent to the snap ring, and a seal is provided around the outer periphery of the spacer. A structure for fixing a seal case, characterized in that the crimped end of the case is pressed by crimping processing so that the seal case is fixed to the outer periphery of the press-fit end of the cylindrical body.