JP2657632B2 - Seal structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal ring fitted in an outer peripheral groove formed along the outer periphery of each of opposed sliding end faces of two members connected by a pin, and a protection ring for covering the seal ring from the outside. The present invention relates to an improvement in a seal structure including a ring.

[0002]

2. Description of the Related Art FIGS. 11 to 13 show joints between an arm of a hydraulic shovel and a bucket as an example of a seal structure. The pin bearings P1 and P2 near the connection between the arm 21 and the bucket 25 are covered with earth and sand or pressed against the earth and sand during excavation work. Therefore, for example, the arm 21
The outer peripheral shoulders of the sliding side surface 24 of the boss 22 of the arm 21 and the sliding side surface 28 of the boss 26 of the bucket 25 are inserted into the pin bearing P1 at the connection portion between the boss 22 and the bucket 25 so that earth and sand and mud do not enter inside. Smooth tapered surfaces 23 and 27 are formed in the portion, and a synthetic rubber O-ring-shaped seal ring 30 is applied to a V-groove 29 formed across the sliding side surfaces 24 and 28 by an appropriate tightening force. Give and fit. The sliding part inside the pin bearing P1 is grease-lubricated,
Since grease is also supplied to the sliding surfaces 24 and 28 of the bosses 22 and 26, the sliding portion between the seal ring 30 and the tapered surfaces 23 and 27 is lubricated, and a smooth sealing function is maintained. . However, as described above, the joint between the arm 21 and the bucket 25 may sometimes be strongly pressed against earth and sand during excavation work. In the conventional mounting structure, the seal ring 3 is
Since the outer peripheral portion of the “0” protrudes outward, this portion is strongly rubbed against earth and sand, and the outer peripheral side of the seal ring 30 is worn out and may eventually break and fall off. If the seal ring 30 is lost, a large amount of earth and sand will enter the inside of the pin bearing P1 through the gap between the sliding sides 24 and 28 of the bosses 22 and 26, and wear and galling of both sliding sides will occur, This can cause play and noise. Also, a new seal ring 3 for repair
In order to insert 0, the pin P must be removed, the bucket 25 must be removed, and the seal ring 30 must be replaced.
It is a complicated work at the work site. Similar problems occur in other joint parts. In the drawing, reference numeral 31 denotes a bearing (bush), and 32 denotes a dust seal.

[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 seal structure in which a protection member for protecting an outer peripheral surface of a seal ring can be easily attached.

[0004]

According to a first aspect of the present invention, there is provided an outer peripheral groove formed along the outer periphery of each of opposing sliding end faces of two members connected by a pin. In a seal structure provided with a seal ring that seals between the sliding end faces of the two members by being fitted into the protective ring, a protective ring is externally fitted so as to cover the outer peripheral surface of the seal ring, and the protective ring is partially Technical means having a notch part radially divided, being urged in a direction to reduce the diameter at the time of external fitting, and having a locking groove for locking the seal ring on the inner surface of the protection ring. Have taken. Also,
According to the second aspect of the present invention, the protection ring is formed of a plurality of elastic pieces, the ends of each of the pieces are bonded to form a ring, and the seal ring is engaged with the inner surface of the protection ring. Technical means that a locking groove is provided. According to a third aspect of the present invention, in the first or second aspect of the invention, one side of the inner peripheral surface of the protective ring is fixed to the outer peripheral surface of one of the opposing sliding end surfaces. , Taking the technical measures of. Further, in the invention according to claim 4, the protection ring is composed of a plurality of elastic pieces, and the ends of each of the pieces are adhered to each other to form an annular shape. A technical measure is taken that the side is fixed to the outer peripheral surface of one of the opposing sliding end surfaces. Also,
According to the fifth aspect of the present invention, there is provided a pin seal in which a seal ring and a protection ring which is set wider than the seal ring and covers the outer peripheral surface are integrally formed, and the pin seal is partially cut radially. And a technical means of being urged in a direction to reduce the diameter when the member is attached to the outer peripheral groove. According to a sixth aspect of the present invention, there is provided a technical means in which the notch of the first, second or fifth aspect is formed so as to extend obliquely in the width direction or the thickness direction.

[0005]

[Function] The protective ring that protects the outer peripheral surface of the seal ring is a single ring or a ring shape that is integrated with the seal ring, and is partially cut off by a cutout, so that the cutout can be made without removing the pin joint. The portion can be expanded to fit outside the seal ring or into the V-groove.
In addition, the ends of the plurality of constituent pieces may be bonded along the outer periphery of the seal ring to form an annular body that covers the seal ring. If the locking ring is provided in the protection ring when the seal ring and the protection ring are separate bodies, the positioning with the seal ring can be easily performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment in which the seal structure of the present invention is used for a joint of a bucket of a hydraulic shovel will be described below with reference to the drawings. First, as shown in FIG. 8, the structure of the joint of the bucket is the same as the structure shown in FIGS. 11 to 13 except for the seal ring.

The seal ring 10 is provided on the boss 1 of the arm 11.
2 and the sliding side surface 1 facing the boss 16 of the bucket 15
V formed in a series in a ring on the outer peripheral portion (shoulder) of 4, 18
It is attached to the outer peripheral groove 19 having a shape. Reference numerals 13 and 17 denote a pair of tapered surfaces forming the outer peripheral groove 19.

Here, the protection ring 1 is made of a flat ring-shaped plastic (fiber reinforced, super high molecular weight polymer, etc.) or spring steel. The protection ring 1 shown in FIG. 1 is formed by making a flat plate into an annular shape, and is provided with a notch 2 in one part. The protection ring 1 is set to a length that can press the outer peripheral surface of the seal ring in the radial direction. The notch 2 is cut and formed so as to intersect with the axis, in other words, to be inclined with respect to the width direction of the protection ring 1. In the protection ring 1 shown in FIG. 2, the notch 2 is cut and formed in parallel with the axis. These can be bent and formed into the protective ring shown in FIG. 3, or can be used integrally with the seal ring as the protective ring in FIG.

Next, in the protection ring 1 shown in FIG. 3, a locking groove 3 for locking the seal ring 10 by forming a concave portion in the center is formed. The locking groove 3 locks with the outer peripheral end of the seal ring 10 to position the protection ring 1 and maintain it at a predetermined position.

As shown in FIG. 4, the protective ring 1 is mounted by expanding the notch 2 to have a large diameter, fitting the seal ring 10 along the outer periphery of the seal ring 10 fitted in the outer peripheral groove 19, and elastically fitting the seal ring 10 after the fitting. This is performed by pressing the outer peripheral surface of the seal ring 10 with the diameter reduced by the return force.

A protective ring 1 'shown in FIG. 5 is prepared by preparing a plurality of constituent pieces 1a made of a flat rubber band having a thickness, and bonding the ends so as to be wound around the outer periphery of the seal ring 10 so as to be fixed in series. Form into a ring. Here, the material of the protection ring 1 'can be changed according to various uses such as NBR, urethane rubber, foamed rubber, and the like. This component 1a may be provided with a locking groove 3 'at the center.

The locking groove 3 'of the protection ring 1' shown in FIG.
Has a semicircular cross section, and the locking groove 3 'shown in FIG. 7 has a V-shaped cross section. The cross-sectional shape of the locking groove is not limited to the above embodiment, but may be any groove shape as long as it can be locked to the outer peripheral surface of the seal ring 10.

In the case of the illustrated example, even if the locking groove portion 3 'is provided, it may be recessed within the thickness range of the component piece 1a. Therefore, when the protection ring 1' is used, the outer surface is flat. be able to. Further, in the protective ring 1 ', a part on the inner surface side may be adhered to one of the bosses 12 and 16 of the arm or the bucket to make it hard to come off.

Next, FIG. 9 shows another embodiment using a pin seal member 5 in which a seal ring and a protection ring are integrally formed. That is, in this embodiment, the seal ring 5a is an O-ring made of synthetic rubber such as nitrile rubber.

An outer surface of the seal ring 5a is formed as an uneven flat surface, and a flat plate is bent to form a ring-shaped protective ring 5 having elasticity.
b is integrally fixed. As a material of the protection ring 5b, a material different from the seal ring, such as plastic, spring steel, NBR, urethane rubber, or foamed rubber, can be used. Thus, in the present invention, the seal ring 5
The protective ring 5a and the protective ring 5b may be formed by fixing different materials as described above, or may be integrally formed of the same material.

Next, the notch 6 formed in the pin seal member 5 is bias-cut so as to be oblique in the thickness direction, as shown in FIG. When the pin seal member 5 is opened in the cutout portion 6 and set in the outer peripheral groove 19, the pin seal member 5 is set to have elasticity so that the pin seal member 5 can be sealed with an appropriate tension.

The pin seal member 5 can be easily fitted into the outer peripheral groove 19 because the cutout 6 is bias cut. Moreover, since the ring-shaped protective ring 5b having elasticity is provided on the outer peripheral side so as to cover the inner seal ring 5a, the seal ring 5a can be prevented from being directly rubbed or pushed by earth and sand, and damaged. Hard to receive. Furthermore, by forming the notch obliquely, the sealing performance is not impaired.

[0018]

According to the present invention, the protection ring is provided with a notch or a component is bonded to form a ring. Therefore, the protection ring can be protected even at an excavation site without removing the pin joint. Rings can be easily installed and replaced. When the seal ring and the protection ring are separate bodies, the protection ring can be prevented from coming off the seal ring by providing the locking groove on the inner peripheral surface of the protection ring. Also, if one side of the inner peripheral surface of the protective ring is fixed to the outer peripheral surface of one member of the sliding end surface, it becomes difficult to separate.In addition, the seal ring and the protective ring can be integrally used as a pin seal member, In this case, attachment and detachment can be performed integrally, and the protection ring does not come off from the seal ring.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a protection ring, wherein (a) is a partial cross-sectional view and (b) is a perspective view.

FIGS. 2A and 2B are views showing an example of a protection ring in which notches are formed in different shapes, wherein FIG. 2A is a partial cross-sectional view, and FIG.

3A and 3B are views showing an example of a protection ring of the present invention provided with a locking groove, wherein FIG. 3A is a partial cross-sectional view, and FIG.

FIG. 4 is a side cross-sectional view showing a mounting state of a protection ring.

FIGS. 5A and 5B are views showing an example of a protection ring using a flat rubber-like component piece, wherein FIG. 5A is a component piece and FIG.

FIG. 6 is a cross-sectional view illustrating an example of a locking groove of the protection ring.

FIG. 7 is a cross-sectional view showing another example of the locking groove of the protection ring.

FIG. 8 is a cross-sectional view showing a mounting state of the protection ring.

FIG. 9 is a cross-sectional view of a main part showing a mounted state of a pin seal member.

FIG. 10 is a sectional view of a main part showing a cutout portion of the pin seal member.

FIG. 11 is a partial side view showing a joint portion between an arm and a bucket.

FIG. 12 is a view along AA in FIG. 11;

FIG. 13 is a sectional view showing a pin bearing portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Protective ring 2 Notch 3, 3' Lock groove 5 Pin seal member 5a Seal ring 5b Protective ring 10 Seal ring 11 Arm 12 Boss 13 Tapered surface 14 Sliding side surface 15 Bucket 16 Boss 17 Tapered surface 18 Sliding side surface 19 Outer groove

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaya Yoto 4-10-1, Yoga, Setagaya-ku, Tokyo New Inside Caterpillar Mitsubishi Co., Ltd. (72) Inventor Hidetake Motomura 4-1-1, Yoga, Setagaya-ku, Tokyo New Inside Caterpillar Mitsubishi Co., Ltd. (72) Inventor Shuichi Namizama 4-1-1 Yoga, Setagaya-ku, Tokyo New Inside Caterpillar Mitsubishi Co., Ltd. (72) Naoshi Watada 4-1-1, Yoga Setagaya-ku, Tokyo New Caterpillar Mitsubishi Incorporated (56) References Japanese Utility Model Sho 58-169260 (JP, U) Japanese Utility Model Hei 1-78771 (JP, U)

Claims (6)

(57) [Claims] 1. A seal ring 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 to seal between the sliding end faces of said two members. In the sealing structure, a protection ring is externally fitted so as to cover an outer peripheral surface of the seal ring, and the protection ring has a cutout portion that partially divides in a radial direction, and a direction in which the diameter is reduced at the time of external fitting. Along with
A sealing structure, wherein a locking groove for locking the seal ring is provided on an inner surface of the protection ring. 2. A seal ring which is fitted into 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 seal structure, a protection ring is externally fitted so as to cover an outer peripheral surface of the seal ring, and the protection ring includes a plurality of elastic pieces.
The end of each component piece is bonded to form an annular shape,
A sealing structure, wherein a locking groove for locking the seal ring is provided on an inner surface of the protection ring. 3. The seal structure according to claim 1, wherein one side of the inner peripheral surface of the protection ring is fixed to the outer peripheral surface of one of the opposing sliding end surfaces. 4. A seal ring is fitted into an outer peripheral groove formed along the outer periphery of each of the opposed sliding end faces of the two members connected by a pin, and seals between the sliding end faces of the two members. In the seal structure, a protection ring is externally fitted so as to cover an outer peripheral surface of the seal ring, and the protection ring includes a plurality of elastic pieces.
The end of each component piece is bonded to form an annular shape,
A seal structure wherein one side of an inner peripheral surface of a protection ring is fixed to an outer peripheral surface of any one of opposing sliding end surfaces. 5. 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 to seal between the sliding end faces of said two members. In the seal structure, there is provided a pin seal in which a seal ring and a protection ring which is set wider than the seal ring and covers the outer peripheral surface are integrally formed, and a notch portion is formed in which the pin seal is partially divided in a radial direction. A seal structure characterized in that the seal structure is urged in a direction to reduce the diameter when being attached to the outer peripheral groove. 6. The seal structure according to claim 1, wherein the notch is formed so as to extend obliquely in a width direction or a thickness direction.