JPH08121605A - Seal ring cover - Google Patents

Abstract

PURPOSE: To prevent damage to a seal ring due to the impact of a foreign object and to easily replace and attach/detach it by forming a long and thin and roughly flat plate-like annular body for covering the seal ring in a freely attachable and detachable manner with its both ends stacked each other and connecting this. CONSTITUTION: An annular body composed of an O ring for covering a seal ring 12 is formed in a long and thin and roughly plate-like (beltlike) shape with both ends 11a and 11b thereof stacked together and linked in a freely attachable and detachable manner by means of a bolt 13 and a nut 14. Further, the middle part of this sealing cover 11 has a hinge structure and since both ends 11a and 11b are freely rotated relative to each other because of this structure, these can be expanded. Thus, damage to the seal ring 12 due to the impact of foreign matter, for instance, earth and sand during work can be prevented as much as possible and replacement work needed because of damage can be simply and quickly carried out only by releasing engagement between both ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is fitted between the sliding end faces of two members by being fitted into the bottoms of outer peripheral grooves formed along the respective outer peripheries of the facing sliding end faces of the two members connected by a pin. The present invention relates to a seal ring cover that covers and protects a seal ring that seals.

[0002]

2. Description of the Related Art Conventionally, the joint portion of a civil engineering work machine, for example, a hydraulic excavator has been constructed as shown in FIGS. FIG. 4 shows the joint parts a, b, c of the hydraulic excavator, and FIG. 5 is a sectional view showing the common details of these joint parts a, b, c. More specifically, the hydraulic excavator has a boom 2 whose base end is pivotally attached to a vehicle-side bracket provided on the vehicle body 1 and which is undulated by a hydraulic cylinder, and a boom 2 whose base end is pivotally attached to the tip of the boom 2. An arm 3 which is rotated by a hydraulic cylinder provided in, and a tip of the arm 3 and the arm 3
And a bucket 4 pivotally attached to the tip of a link provided via a hydraulic cylinder. Then, as shown in FIG. 5, the respective joint portions a, b, c are provided with a pair of left and right bosses 5 of the bracket 5.
The boss 6a of the pivot member 6 is coaxially arranged between a and is pivotally attached by the pin P, and the inclined surfaces formed on the outer sides of the sliding surfaces of each other are arranged so as to face each other. A substantially V-shaped outer peripheral groove 7 is formed at the bottom. 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 the outer peripheral groove 7 by the elastic action of the contracting force of the O-ring 8. The O-ring 8 prevents dirt and sand from entering the gap S between the sliding surfaces of the bracket 5 and the boss 6a. In the figure, 9 is a bearing (bush) and 10 is a dust seal. The dust seal 10 is provided only to protect the pin P, the boss end face, and the bush 9 part, and the O-ring 8 is intended to protect the end face of the joint part, but in the work at a site such as a rocky place. The O-ring 8 may be damaged by rocks or other fallen objects that have been excavated. If the O-ring 8 is left uncut, it may cause galling of the pivot pin or abnormal wear of the end face. When the O-ring 8 is broken, it is necessary to pull out the pin P once to replace and install the O-ring, which makes the O-ring replacement work complicated, and especially in a large machine, it is necessary to replace the small O-ring. Therefore, it may be a big construction. On the other hand, conventionally, a protector for protecting the O-ring 8 is not provided, or an integrally formed annular protector is attached to cover the outer side of the O-ring, but it is endless. Since it is an annular body, it was inconvenient to attach and detach because the pin had to be pulled out.

[0003]

The present invention was devised in view of the above circumstances, and its main problem is to
It is an object of the present invention to provide a seal ring cover for protecting the seal ring, which can be easily attached and detached without removing the joint of the joint portion by the pin.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a cover for a seal ring, which is in the form of an elongated flat plate and can be detachably locked with its both ends overlapping each other. The technical measure was taken to cover the seal ring with. That is, the present invention is a seal that is fitted into the bottom portion of the outer peripheral groove formed along the outer circumference of each of the facing sliding end surfaces of two members connected by a pin to seal between the sliding end surfaces of the two members. A seal ring cover for covering and protecting the ring, which is in the form of an elongated flat plate and has an annular body for covering the seal ring with both ends thereof overlapping each other so that the ring body is detachably connected. The present invention provides a cover for a seal ring, which is characterized by In addition, as the connection method of both ends, both ends are bent at a substantially right angle and detachably connected to each other through the bent portion, or both ends are attached and detached in a state where they are vertically overlapped with each other. It is possible to appropriately select a method such as possible connection. In addition, as a shape of the cover for the seal ring, one of the cross-sectional shapes perpendicular to the longitudinal direction may be curved inward, and the covering of the exposed surface of the seal ring may be more complete. The length of the seal ring cover is slightly longer than the outer circumference of the seal ring so that it can be rotated around the seal ring when the both ends are connected, and the impact of rocks from the outside is buffered. May be. Further, the seal ring cover may be composed of a plurality of members of arcuate plate members that are rotatably connected to each other via a pivoting means such as a hinge.

[0005]

Since the exposed surface of the seal ring is covered by this seal ring cover, damage to the seal ring due to impact of foreign matter such as earth and sand during work can be prevented as much as possible. Further, since the seal ring cover is attached to the joint part of the working machine in a state where the both ends are detachably connected to each other, even if the seal ring cover is replaced due to damage or the like, it does not matter what the other members are. It can be removed simply by releasing the engagement, and the replacement work can be performed easily and quickly.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the seal ring cover of the present invention is used in a joint portion of a hydraulic excavator will be described below with reference to FIGS. In addition, here in FIG.
FIG. 2A is a plan view of the seal ring cover of the present invention, and FIG. 2 is a cross-sectional view of essential parts showing a state in which the seal ring cover is attached so as to cover the outside of the seal ring. As shown in FIGS. 1 and 2, the seal ring cover 11 has an elongated substantially flat plate shape (strip shape), and both end portions 11 thereof are formed.
In the state where a and 11b are overlapped with each other, an annular body that covers the seal ring 12 formed of the O ring is formed, and the bolt 13
And a nut 14 (fixed by a double nut type in the illustrated example) so as to be detachably connected.

Further, the seal ring cover 11 has a hinge structure 15 at a substantially middle portion thereof, which is rotatable with respect to each other via both ends 11a, 11a.
b can be widened. A cross section perpendicular to the longitudinal direction has one side edge curved inward as shown in Fig. 1 (b). As shown in FIG. 2, this is to make it possible to more completely cover the exposed surface of the seal ring 12 mounted on the bottom of the outer peripheral groove 7 formed in a series on the outer peripheral portion of the opposed sliding surfaces. However, in some cases, it may not be curved in this way, but may be quite flat as shown in FIG. 1 (c). In the figure, 5
a is a boss of the bracket, and 6a is a boss of the pivot member 6.

The length of the seal ring cover 11 may be such that it is in close contact with the peripheral surface of the adherend, but it is preferably slightly longer than the outer circumference of the adherend. Allows the seal ring cover 11 to freely rotate on the peripheral surface of the adherend member, so that when a rock or the like hits from the outside, the seal ring cover 11 is easily rotated to buffer the shock. .

The method of attaching the seal ring cover 11 to the peripheral surface of the adherend member is not particularly limited, but as shown in FIG. 2, for example, the exposed surface of the seal ring 12 may be covered. , The pivot side member 16 or the holding side member 1
After the seal ring cover 11 is wound around the peripheral surface of the adherend member so that the head of the bolt 13 previously inserted into the mounting hole 11c is placed on either side of the other end 7, the other end This is done by inserting the bolt 13 into the mounting hole 11d of the section, fitting the nut 14 into the bolt 13 and tightening. When removing the seal ring cover 11, the nut 14 may be removed from the bolt 13 and the both ends 11a and 11b of the seal ring cover 11 may be disengaged.

In the above description, the O-ring is shown as an example of the seal ring 12, but the type, sectional shape and type of the seal ring are not particularly limited. Next, the seal ring cover 11 has been described as being composed of a combination of ring-shaped components divided by a hinge, that is, arc-shaped components. However, the seal-ring cover 11 is not limited to this, and is further divided. It may be a single one that is not divided at all.

Further, in the case of a ring-shaped component which is divided into two or more, that is, a combination of arc-shaped component pieces, these are connected to each other through a hinge as in the above embodiment, and both end portions are connected. Like the connection method of 11a and 11b, it may be detachably connected via the bolt 13 and the nut 14. The material of the seal ring cover 11 is also not particularly limited, and can be selected from casting, forging, other forms of metal, reinforced plastic, urethane rubber, composite material, and the like.

FIG. 3 shows an embodiment in which both ends of the seal ring cover 11 are connected to each other. Both ends 11a and 11b are bent substantially at right angles, and the bent parts are mutually bent. They are removably connected to each other via bolts 13 and nuts 14 so as to face each other. Since other configurations are the same as those in the above-mentioned embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted. The attachment / detachment method is also the same as in the above embodiment. According to the present invention, the seal ring cover 11 is attached by
The present invention is not limited to the combination of the bolts and nuts described above, and other hooking and locking structures may be used, and any locking structure may be used as long as it is detachable. In this way, the O-ring 8 fitted in the outer peripheral groove 7 can be covered by the seal ring cover 11.

[0013]

According to the present invention, since the exposed surface of the seal ring is covered with the seal ring cover, damage to the seal ring due to impact of foreign matter such as earth and sand during work can be prevented as much as possible. Also, since the seal ring cover is designed to be detachably connected at both ends,
It is easy to replace and attach / detach, and it is not necessary to remove the joint part by the pin of the joint part. Further, since the seal ring cover is rotatably attached, even if a rock or the like hits from the outside, the seal ring cover can be easily rotated to absorb the shock.

[Brief description of drawings]

1 shows an embodiment of a seal ring cover of the present invention, (a) is a plan view, (b) is a partial sectional view of the cover, and (c) is a sectional view of a different embodiment. .

FIG. 2 is a cross-sectional view of essential parts showing a state in which the seal ring cover of FIG. 1 is attached to a joint portion of a working machine.

FIG. 3 is a main part plan view showing a different embodiment of the seal ring cover.

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

FIG. 5 is a cross-sectional view showing a conventional joint part sealing mechanism.

[Explanation of symbols]

 2 ... Boom 3 ... Arm 4 ... Bucket 6 ... Pivot side member 6a ... Boss 5 ... Bucket 5a ... Bracket 7 ... Outer peripheral groove 10 ... Protector 11 ... Seal ring cover 12 ... Seal ring (O-ring) 13 ... Bolt 14 ... Nut 15 ... Hinge structure 16 ... Pivoting side member 17 ... Holding side member S ... Gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaya Ito 4-10-1 Yoga, Setagaya-ku, Tokyo New Caterpillar Mitsubishi Corporation

Claims (4)

[Claims] 1. A seal ring which is fitted into the bottom of an outer peripheral groove formed along the outer circumference of each of the opposed sliding end faces of two members connected by a pin and seals between the sliding end faces of the two members. A cover for a seal ring that covers and protects the seal ring, and has a long and narrow flat plate shape, with both ends overlapping each other to form an annular body that covers the seal ring and is detachably connected. The cover for the seal ring, which is characterized in that 2. The seal ring according to claim 1, wherein both ends are bent substantially at right angles, and the bent parts are detachably connected so as to face each other. cover. 3. The seal ring cover according to claim 1, wherein one of the cross-sectional shapes of the seal ring cover perpendicular to the longitudinal direction is curved inward. 4. The cover for a seal ring according to claim 1, wherein the cover for the seal ring is composed of a plurality of members of arcuate plate members which are rotatably connected to each other via a hinge. .