JP2872583B2 - Storage structure of seal ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sealing a gap between sliding end faces of two members connected by pins into outer peripheral grooves formed along the outer circumference of opposing sliding end faces. The present invention relates to a structure for storing spare seal rings.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show joints a, b and c of a hydraulic shovel shown as an example of a working machine. Here, the hydraulic excavator is provided on a boom 2 having a base end pivotally attached to a vehicle-side bracket provided on a vehicle body 1 and raised and lowered by a hydraulic cylinder, and a base end pivotally attached to a distal end of the boom 2. And a bucket 4 pivotally connected to a tip of the arm 3 and a tip of a link provided to the arm 3 via a hydraulic cylinder. And each joint is
The bosses 6a of the pivot member 6 are coaxially arranged between the bosses 5a of the brackets 5 provided on the left and right sides, and are pivotally connected by the pins P, and are inclined surfaces formed outside the sliding surfaces of each other. Are opposed to each other to form a substantially V-shaped outer peripheral groove 7. An O-ring 8 is fitted into the bottom of the outer peripheral groove 7 as an oil seal, and the O-ring 8 is prevented from falling off from the outer peripheral groove 7 by the elastic action of the contraction force. This prevents earth and sand from entering the gap S between the sliding surface of the bracket 5 and the boss 6a by the O-ring 8. However, in a work at a site such as a rocky place, there is a possibility that the O-ring 8 may be cut off by excavated rocks or other falling objects. If the cutout of the O-ring 8 is left unattended, the pin serving as the pivot may be seized or abnormal wear of the end face may occur. In order to replace the O-ring, it is necessary to once pull out the pin, and the O-ring replacement operation becomes complicated. In particular, in the case of a large machine or the like, replacement of a small O-ring may require a large amount of work.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its main problems are as follows.
An object of the present invention is to provide a storage structure of a seal ring in which a seal ring can be replaced without removing a joint of a joint by a pin. Another object of the present invention is to provide a storage structure of a seal ring that prevents breakage of a seal ring and can easily replace the seal ring when the seal ring is broken.

[0004]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention according to claim 1 includes the steps of (a) forming along the outer periphery of each of the opposed sliding end faces of two members connected by pins. A seal ring that fits into the outer peripheral groove to be sealed and seals between the sliding end faces of the two members, and stores a spare seal ring. (B). And a technical measure of fitting a spare seal ring is taken. Further, in the invention of claim 2, in addition to the above configuration, a technical measure of (c) providing a cover piece for covering the opening side of the storage groove is taken. According to the third aspect of the present invention, with respect to the configuration of the cover piece of the second aspect, (d) the cover piece is formed of an annular body divided into a plurality of parts, and the base of the cover piece is formed of a member having a storage groove formed therein. Technical measures are taken to be detachably attached. Furthermore, in the invention of claim 4, (e). A technical feature that the cover piece is set to a length that covers the outer peripheral groove beyond the storage groove and serves as a protector that protects the seal ring fitted in the outer peripheral groove. Take steps.

[0005]

Since the spare seal ring is fitted in the storage groove provided in one of the two members forming the outer peripheral groove, if the seal ring fitted in the outer peripheral groove is cut off,
The spare seal ring inserted in the storage groove can be expanded to a large diameter, removed from the storage groove, pulled out and inserted into the outer peripheral groove, so that the seal ring can be replaced without removing the joint part by the pin. It can be carried out.
By covering the opening of the storage groove with a cover piece, it is possible to protect against external impact such as earth and sand and rocks, and to prevent damage to the spare seal ring. When this cover piece is formed into an annular body by combining a plurality of divided constituent pieces, the cover piece can be easily attached and detached or replaced. Furthermore, if the length of the cover piece is set to cover the outer peripheral groove beyond the storage groove, it can also function as a protector for protecting the seal ring fitted in the outer peripheral groove.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the storage structure of a seal ring according to the present invention is used for a joint of a working machine of a hydraulic shovel will be described below with reference to the drawings. As shown in FIG. 1, the storage structure of the seal ring includes an outer peripheral groove 7 formed in a series of annular shapes on the outer peripheral portion of the opposed sliding surfaces of the two members.
An O-ring 8 mounted on the bottom of the outer peripheral groove 7, a storage groove 9 formed annularly at a position away from the outer peripheral groove 7, and a spare O-ring 8 ′ fitted into the peripheral storage groove 9. And a cover piece 10 that covers the opening of the storage groove 9.

That is, the two members include a pivot member 6 and a holding member 5 that supports the pivot member 6, and the outer circumferential groove 7 is pivotally connected by a pin P. A boss 6a provided in a pin insertion hole of a moving-side member (for example, an arm) 6 and a boss 5a provided in a pin insertion hole of a bracket 5 provided on a pair of left and right sides of a holding-side member (for example, a bucket). Are formed in a substantially V-shape by forming a half groove bottom surface symmetrically inclined outside the opposed sliding surface.

[0008] At the base end of the boss 6a, a storage groove 9 is provided.
Are formed in an annular shape, and the inner wall of the groove 9 rises vertically to form a mounting surface 20 to which the cover piece 10 is fixed. A screw hole 21 is formed on the mounting surface 20 at a position that matches the screw hole 11 of the cover piece 10 during mounting.
The cover piece 10 can be screwed. On the other hand, an O-ring 8 is fitted into the bottom of the outer peripheral groove 7 to seal the gap S between the sliding surfaces by the shrinkage force of the elasticity of the rubber and to prevent the outer peripheral groove 7 from falling off.

Further, as described above, one or more (four in the illustrated example) spare O-rings 8 'are fitted into the storage grooves 9. At this time, it is preferable that the bottom of the storage groove 9 is set deeper than the outer peripheral groove 7, so that the spare O-ring 8 ′ is not tightened more than when it is fitted into the outer peripheral groove 7. In the present invention, an O-ring is shown as an example of the seal ring, but the type, cross-sectional shape, and type of the seal ring are not particularly limited.

Next , as shown in FIG. 3, in the case of the present embodiment, the cover piece 10 is composed of a combination of one or more arc-shaped constituent pieces divided along the outer periphery. The cover piece 10 may have any configuration as long as it covers the opening of the storage groove 9 and receives an external impact, and its shape is not particularly limited. In the illustrated example, it is made of a sheet metal press and has an angled cross section. Screw holes 11 are drilled at equal intervals along the outer periphery, so that the screw holes 11 can be screwed in alignment with the screw holes 21 of the mounting surface 20. It has become.

Next , as shown in FIG.
If the length is set to cover the outer peripheral groove 7 beyond the storage groove 9, it also serves as a protector for protecting the O-ring 8 fitted in the outer peripheral groove 7. In this case, the cover piece 10 may be a molded product (casting, forging, reinforced plastic, urethane rubber, or the like) having, for example, a substantially triangular cross section, and screw holes are provided at regular intervals along the outer periphery and attached. It can be screwed to the surface 20.

In this manner, the spare O-ring 8 ′ fitted into the storage groove 9 and the O-ring 8 fitted into the outer circumferential groove 7 are covered by the cover piece 10. In the above embodiment, the pivot-side member is formed of a boss, and the case where the pivot-side member is sandwiched between the holding-side members formed of a pair of brackets is illustrated. Become
In the case where the holding member including the boss is pivotally attached so as to sandwich both sides, a mounting surface may be formed on the base end of the boss portion on the bracket side serving as the pivot member, and a cover piece may be attached. Further, in the present invention, the storage groove and the cover piece may be provided in one of the two members of the joint portion, and the storage groove and the cover piece may be provided in different members. Further, the cover piece may be configured to combine the component pieces to be integrated or divided, and in the latter case, the adjacent component pieces may be combined without any gap to form an annular shape, or the adjacent portions may be overlapped and combined to form an annular shape. Good.

[0013]

According to the present invention, one or a plurality of spare seal rings are fitted and stored in the storage groove. Therefore, even if the seal ring fitted in the outer circumferential groove is cut off, the seal ring is fitted in the storage groove. Replace the seal ring without removing the joint part with the pin until all the seal rings are gone.
Can be replenished. Further, by providing a cover piece that covers the opening of the storage groove, protection of the spare seal ring can be achieved, and by simultaneously covering the outer peripheral groove, it also functions as a protector for the seal ring in use. The cover piece is divided into one or a plurality of pieces along the outer circumference. If the cover piece is attached in a ring shape, the cover piece can be attached / detached / replaced without removing the joint part by the pin.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an embodiment of a storage structure of a seal ring of the present invention.

FIG. 2 is a sectional view of a main part showing a different embodiment in which a cover piece also covers an outer peripheral groove.

FIG. 3 is a perspective view showing components of a cover piece.

FIG. 4 is a side view showing an example of a joint of the working machine.

FIG. 5 is a sectional view showing a conventional sealing portion.

[Explanation of symbols]

 Reference Signs List 2 boom 3 arm 4 bucket 5a boss portion of bracket 6 arm 6a boss 7 outer peripheral groove 8 O-ring 8 'spare O-ring 9 storage groove 10 cover piece 11 screw hole 20 mounting surface 21 screw hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16J 15/16

Claims (4)

(57) [Claims] 1. A seal ring which is fitted into an outer peripheral groove formed along the outer periphery of each of opposed sliding end faces of two members connected by a pin and seals between the sliding end faces of said two members. A structure for storing a spare seal ring, wherein at least one of the two members is provided with an annular storage groove, and the spare seal ring is fitted. 2. A seal ring which is fitted in an outer peripheral groove formed along an outer periphery of each of opposed sliding end faces of two members connected by a pin and seals between the sliding end faces of said two members. In the structure for storing the spare seal ring, at least one of the two members is provided with an annular storage groove, the spare seal ring is fitted, and a cover piece covering the opening side of the storage groove is provided. The storage structure of the seal ring characterized by the above. 3. A cover member comprising an annular body divided into a plurality of pieces along an outer periphery, wherein a base of the cover piece is detachably attached to a member having a storage groove formed therein. A storage structure for the seal ring according to claim 2. 4. The protector for protecting a seal ring fitted in the outer peripheral groove by setting a length of the cover piece to cover the outer peripheral groove beyond the storage groove. Seal ring storage structure.