JP2001039361A - Crawler track seal device and seal used therefor - Google Patents

Abstract

(57) [Problem] To provide a crawler belt seal device capable of stably sealing performance over a long period of time and a seal used for the same. SOLUTION: Inner link portions 19 of one track link are fixed to both ends of a cylindrical bush 23, and a connecting shaft 24 is rotatably inserted into the bush 23, and the connecting shaft 2
In the crawler belt in which the outer link portion 20 of the other track link is fixed to both ends of the track link 4, respectively, in the annular space formed between the recess 26 of the outer link portion 20 and the bush 23 in each track link, First with M-shaped cross section
And a second annular side member 30 which is provided between the second annular side piece 30 and the end face of the bush 23 which constitute the first annular seal body 32 and which constitutes a relative sliding seal surface.
A seal 32 comprising an annular seal body 34 and a third annular seal body 35 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler belt seal device suitable for use in a tracked vehicle such as a hydraulic shovel, a hydraulic crane, and the like, and a seal used therein.

[0002]

2. Description of the Related Art In general, crawler tracks used in tracked vehicles such as hydraulic shovels have left and right links in which an outer link portion is formed on one side in the longitudinal direction and an inner link portion is formed on the other side in the longitudinal direction. A track link, a bush provided between the inner link portions of the track links, and both left and right ends facing the outer link portion; and a left and right direction inserted into the bush and provided. And a connecting device having both ends fitted to and connected to the outer link portion, and a seal device provided between the recess of the outer link portion of each of the track links and the end face of the bush.

Various types of seal devices have been proposed as the above-mentioned seal devices. An annular seal having a substantially W-shaped cross section as shown in Japanese Utility Model Publication No. Sho 51-41309 is generally used. The recessed portion of the outer link portion of the track link whose side surface is in contact with the end surface of the bush constitutes a sealing surface. Further, in the above-mentioned known example, in order to further improve the sealing performance, wear-resistant plates are provided on both sides of the above-described annular seal having a substantially W-shaped cross section, and the track link which is in contact with the wear-resistant plate is provided. Of the outer link portion and the end surface of the bush constitute a sealing surface.

[0004]

In recent years, it has become necessary to move this kind of tracked vehicle from a work site to a place where it can be managed in order to prevent theft. As a result, the tracked vehicle will travel more than necessary, and a great amount of sliding resistance acts on the seal inserted between the track link and the bush. There is a problem that the sealing function is deteriorated in a short period of time, and it is not possible to obtain a long life.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can improve the durability of a seal against a load in a compression direction, and can stably maintain the sealing performance over a long period of time. It is an object of the present invention to provide a crawler belt seal device capable of being operated and a seal used for the same.

[0006]

According to a first aspect of the present invention, an inner link portion of one track link is fixed to both ends of a cylindrical bush, and a connecting shaft is connected to the bush. Are rotatably inserted and the outer link portions of the other track links are fixed to both ends of the connection shaft, respectively, and are formed between the recesses of the outer link portions and the bushes of the respective track links. A first annular side piece contacting a peripheral surface and a side surface of the outer link portion forming an annular space in the annular space; a second annular side piece located on the end face side of the bush; V section connecting the annular side piece and the second annular side piece
A first annular seal member having an M-shaped cross-section and a second annular side piece constituting the first annular seal member and an end face of the bush; A crawler belt seal device is provided with a seal including a second annular seal member and a third annular seal member that form relative sliding seal surfaces.

According to the first aspect of the present invention, the contact surface 3 between the second annular seal member and the third annular seal member is a relatively sliding seal surface, and the end surface of the bush and the third annular seal member are connected to each other. The contact surface with the annular seal member forms a non-sliding seal surface, so that intrusion of dust into the contact surface between the end surface of the bush and the third annular seal member is suppressed, and the seal against the load in the compression direction is prevented. , And the sealing performance can be favorably stabilized for a long period of time.

According to a second aspect of the present invention, an inner link portion of one of the track links is fixed to both ends of a cylindrical bush, and a connecting shaft is rotatably inserted into the bush. In the crawler belt in which the outer link portion of the other track link is fixed, the annular space of the outer link portion is formed in the annular space formed between the recess of the outer link portion and the bush in each track link. A first annular side piece that is in contact with the peripheral surface and the side surface forming the second bush, a second annular side piece that is located on the end face side of the bush, the first annular side piece, and a second annular side piece And an annular connecting portion having a V-shaped cross section for connecting
An annular seal member, and a second annular seal member located on the second annular side portion constituting the first annular seal member;
A third annular seal located on the end face side of the bush, and a third annular seal provided between the second annular seal and the third annular seal; A crawler belt seal device provided with a seal comprising a fourth annular seal member forming a relative sliding seal surface.

According to the second aspect of the present invention, the second annular seal located on the side of the second annular side constituting the first annular seal and the second annular seal located on the end face side of the bush. A fourth annular seal body is provided between the third annular seal body and the third annular seal body,
A relative sliding seal surface is formed between the fourth annular seal body and the second or third annular seal body which is in contact with the fourth annular seal body, and a contact surface between the end face of the bush and the third annular seal body is slidable. Since the seal surface does not move, the intrusion of dust into the contact surface between the end surface of the bush and the third annular seal body can be suppressed, and the durability of the seal against a load in the compression direction can be increased. Can be favorably stabilized over a long period of time.

Further, according to a third aspect of the present invention, an inner link portion of one of the track links is fixed to both ends of a cylindrical bush, and a connecting shaft is rotatably inserted into the bush. Crawler belt seal device, wherein the outer link portions of the other track links are fixed to each other, and the seal is housed in an annular space formed between the recessed portion of the outer link portion and the bush end face of each track link. The seal includes a first annular side piece contacting a peripheral surface and a side surface forming an annular space of the outer link section, a second annular side piece located on the end face side of the bush, and the first annular side piece. A first annular seal member having an M-shaped cross section, comprising a V-shaped annular connection portion connecting the portion and the second annular side piece portion; and a second annular member forming the first annular seal member. Between the side piece and the bush It is provided between the surface, in the sealing of the track seal device characterized by comprising a second annular sealing member and the third annular sealing member constituting the relative sliding sealing surface.

According to the third aspect of the present invention, the contact surface 3 between the second annular seal member and the third annular seal member is a relatively sliding seal surface, and the end surface of the bush and the third annular seal member are connected to each other. The contact surface with the annular seal member forms a non-sliding seal surface, so that dust can be prevented from entering the contact surface between the end surface of the bush and the third annular seal member, and the seal against the load in the compression direction can be prevented. Can be improved, the sealing performance can be satisfactorily stabilized over a long period of time, and the assembling operation is simple and inexpensive.

Further, according to a fourth aspect of the present invention, an inner link portion of one of the track links is fixed to both ends of a cylindrical bush, and a connecting shaft is rotatably inserted into the bush. Crawler belt seal device, wherein the outer link portions of the other track links are fixed to each other, and the seal is housed in an annular space formed between the recessed portion of the outer link portion and the bush end face of each track link. The seal includes a first annular side piece contacting a peripheral surface and a side surface forming an annular space of the outer link section, a second annular side piece located on the end face side of the bush, and the first annular side piece. A first annular seal member having an M-shaped cross section, comprising a V-shaped annular connection portion connecting the portion and the second annular side piece portion; and a second annular member forming the first annular seal member. The second located on one side And a third annular seal located on the end face side of the bush, and provided between the second annular seal and the third annular seal, wherein the second or third annular seal is provided. A fourth annular seal member forming a sliding seal surface relative to the annular seal member.

According to the fourth aspect of the present invention, the second annular seal located on the side of the second annular side constituting the first annular seal and the second annular seal located on the end face side of the bush. A fourth annular seal body is provided between the third annular seal body and the third annular seal body,
A relative sliding seal surface is formed between the fourth annular seal body and the second or third annular seal body which is in contact with the fourth annular seal body, and a contact surface between the end face of the bush and the third annular seal body is slidable. Since the seal surface does not move, the intrusion of dust into the contact surface between the end surface of the bush and the third annular seal body can be suppressed, and the durability of the seal against a load in the compression direction can be increased. Can be satisfactorily stabilized for a long time, and the assembling work is simple and inexpensive.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a crawler belt seal device and a seal according to an embodiment of the present invention.

FIG. 1 shows a hydraulic excavator equipped with an embodiment of a crawler belt sealing device according to the present invention. In FIG. The revolving superstructure 3 provided is a driver's cab provided on the revolving superstructure 2 on the front side, 4 is an engine room provided at an intermediate portion on the revolving superstructure 2,
Reference numeral 5 denotes a counter weight provided at a rear portion on the revolving superstructure 2.

Reference numeral 6 denotes a boom provided at the front of the revolving unit 2 so as to be able to move upward and downward, 7 is a hydraulic cylinder for operating the boom, and 8 is a boom 6
Reference numeral 9 denotes a hydraulic cylinder for operation thereof, reference numeral 9 denotes a hydraulic cylinder for operation thereof, reference numeral 10 denotes a bucket rotatably provided at the end of the arm 8, and reference numeral 11 denotes a hydraulic cylinder for operation thereof.

The above-mentioned traveling body 1 is a track frame 1
2, left and right side frames 13 (only one is shown) projecting to the side of the track frame 12, idler wheels 14 and drive wheels 15 provided at both ends of the side frame 13, respectively, Crawler belt 16 wound around wheel 14 and drive wheel 15, and crawler belt 16
3 and an upper roller 17 for guiding the crawler belt 16 below the side frame 13.

FIG. 2 is an enlarged cross-sectional view showing a traveling body of the hydraulic shovel provided with the embodiment of the crawler belt sealing device of the present invention shown in FIG. 1. In FIG. Things are the same part. Reference numeral 19 denotes an inner link portion of one track link constituting the crawler belt 16, reference numeral 20 denotes an outer link portion of the other track link constituting the crawler belt 16, and reference numeral 21 denotes a track shoe attached to each track link.

Reference numeral 22 denotes an inner link portion 1 of each track link.
9 is a bush inserted in the bush insertion hole 22 of each of the inner link portions 19 in a press-fit state, and 24 is an inner link portion 1 of one of the track links.
9 and the outer link portion 20 of the other track link.
And both ends thereof are press-fitted into connection shaft insertion holes 25 of the outer link portion 20 of the other track link, respectively.

Reference numeral 26 denotes a concave portion formed on the inner surface of the outer link portion 20 of the other track link. The concave portion 26 is a bush 23 partially introduced into the concave portion 26.
The end surface 27 and the outer peripheral surface of the connecting shaft 24 form an annular space for accommodating the sealing device. Reference numeral 28 denotes a sealing device housed in the above-mentioned annular space.

FIG. 3 is an enlarged sectional view showing a crawler belt connecting portion provided with an embodiment of the sealing device of the present invention. In FIG. 3, the same reference numerals as those shown in FIG. 2 denote the same parts. . The sealing device 28 blocks foreign matter such as earth and sand that enters through a gap between the inner link portion 19 and the outer link portion 20 from entering between the bush 23 and the connection shaft 24. The first annular side piece 29 that contacts the peripheral surface and the side face of the recess 26 to be formed, the second annular side piece 30 located on the end face side of the bush 23, and the first annular side piece 29 A first annular seal member 32 having an M-shaped cross section, comprising an annular connecting portion 31 having a V-shaped cross section for connecting the second annular side piece portion 30; and a second member forming the first annular seal member 32 Of the annular side piece 30 and the bush 2
3 is provided as a seal comprising a second annular seal body 34 and a third annular seal body 35 which constitute a relative sliding seal face 33 and is provided in a compressed state. Is housed in a closed annular space.

In order to form the contact surface between the second annular seal member 34 and the third annular seal member 35 as a relative sliding seal surface 33, the third annular seal member 35 is provided.
Is made of a steel material, such as an elastomer material such as an epoxy rubber or a fluorine resin material such as FRP, which increases a contact friction force with the end surface 27 of the bush 23. The second annular seal body 34 is made of a material such as urethane rubber, which is an elastomer material and has a large contact frictional force with the first annular seal body 32, for example, a fluorine resin material such as FRP.

Accordingly, the third annular seal body 35 rotates together with the bush 23 due to the contact frictional force with the end face 27 of the bush 23, and the second annular seal body 34 is in contact with the first annular seal body 32. Due to the contact frictional force described above, the second annular seal member 34 and the third annular seal member 35 form a relative sliding seal surface 33 because the second annular seal member 34 and the third annular seal member 35 rotate together with the first annular seal member 32. In other words, the contact surface between the third annular seal member 35 and the end surface 27 of the bush 23 and the contact surface between the second annular seal member 34 and the first annular seal member 32 cause relative slippage. Make up no sealing surface.

Next, the operation of the above-described embodiment of the sealing device of the present invention will be described.

When the crawler belt 16 is driven to move by the engagement of the teeth of the drive wheel 15 with the bush 23, one track link and the other track link constituting the crawler belt 16 perform relative movement around the connection shaft 24. Occurs.

At this time, the sealing device 28 performs the following operation. That is, the third annular seal body 35 is
3 along with the bush 23 due to the contact frictional force with the end surface 27, and the second annular seal body 34 along with the first annular seal body 32 due to the contact frictional force with the first annular seal body 32. Since it rotates, the second annular seal body 34
The contact surface between the third annular seal member 35 and the third annular seal member 35 becomes a relative sliding seal surface 33, and the contact surface between the third annular seal member 35 and the end surface 27 of the bush 23 and the second annular seal member 34 The contact surface with the one annular seal body 32 forms a seal surface that does not cause relative slippage.

As a result, foreign matter such as earth and sand that enters through the gap between the inner link portion 19 and the outer link portion 20 is removed by the third annular seal member 35 and the end surface 27 of the bush 23.
The contact surface between the bush 23 and the connecting shaft 24 is suppressed by the configuration of the contact surface with the bush 23 and the connecting shaft 24. Thereby, the sealing performance is improved, and the second annular seal body 34 and the third annular seal body 3
Since the relative sliding seal surface 33 is formed on the contact surface with the surface 5, the wear resistance thereof can be improved.

Furthermore, the sealing device 28 gives a resistance to the movement of the connecting shaft 24 in the axial direction and around the shaft with respect to the bush 23 by the elastic muscle force of the first annular sealing body 32. Movement can be suppressed, and the accompanying noise can be reduced.

Further, since the seal device 28 has a combination of the first, second and third annular seal members 32, 34 and 35, the replacement operation is easy and the manufacturing cost is low.

FIG. 4 is an enlarged sectional view showing a crawler belt connecting portion provided with another embodiment of the sealing device of the present invention. In FIG. 4, the same reference numerals as those shown in FIG. is there. In the sealing device 28 of this embodiment, a fourth annular seal body 36 made of steel is provided between a first annular seal body 32 and a second annular seal body 34.

According to this embodiment, the frictional force of the contact surface between the fourth annular seal member 36 and the first annular seal member 32 is increased, so that the first annular seal member 32 and the second annular seal member 32 are increased. The relative slip on the contact surface with the seal body 34 can be improved. As a result, the sealing performance can be further improved as compared with the above-described embodiment of the sealing device of the present invention. Further, as in the case of the sealing device according to the embodiment of the present invention, noise can be reduced, and assembling and replacing operations are easy and inexpensive.

FIG. 5 is an enlarged sectional view showing a crawler belt connecting portion provided with still another embodiment of the sealing device of the present invention. In FIG. 5, the same reference numerals as those shown in FIG. It is. Sealing device 28 in this embodiment
Is provided with a protruding portion 37 protruding toward the bush 23 on the outer periphery of the side surface of the second annular side piece 30 constituting the first annular seal body 32, and the second annular side piece 30 In addition, the outer circumference of the third annular seal body 35 is covered, and foreign matter to each seal surface formed by the first annular seal body 32, the second seal body 34, the third annular seal body 35, and the bush 23 is formed. In addition to suppressing intrusion, a gap between the peripheral surface of the recess 26 and the outer peripheral surface of the bush 23 is closed to further suppress the intrusion of foreign matter into each of the seal surfaces described above.

According to this embodiment, in addition to the effects of the above-described embodiment, the life of the seal body can be further increased by providing the protruding portion 37.

In this embodiment, an example is shown in which two layers of seals 32 and 34 are provided, but it is also possible to form three or more layers.

FIG. 6 is an enlarged sectional view showing a crawler belt connecting portion provided with another embodiment of the seal device of the present invention, and FIG. 7 is a view of the first annular seal member as viewed from the arrow-in FIG. In these drawings, the same reference numerals as those in FIG. 5 denote the same parts. 6 and 7, reference numeral 38 denotes a first annular groove provided on the outer surface of the second annular side piece 30 in the first annular seal body 32, and 39 denotes a second annular groove in the first annular seal body 32. The second annular groove 40 provided on the inner side surface of the annular side piece 30 is a plurality of radial grooves provided on the side surface of the second annular side piece 30 in the first annular seal body 32. The groove 40 connects the first annular groove 38 and the second annular groove 39 described above.

The first annular groove 38, the second annular groove 39, and the radial groove 40 are filled with lubricating oil such as grease.

According to this embodiment, the first annular groove 3
8, the lubricating oil such as grease filled in the second annular groove 39 and the radial groove 40 is filled with the side surface of the second annular side piece 30 in the first annular seal body 32 and the second annular seal body 34. To make the frictional resistance between the contact surfaces smaller than that of the other contact surfaces. Thereby, the contact surface between the side surface of the second annular side piece 30 of the first annular seal member 32 and the second annular seal member 34 becomes a relative sliding surface.

As a result, the position of the relative sliding surface can be further shifted from the end surface of the bush 23 toward the concave portion 26, so that the sealing performance against foreign matter intrusion can be further improved.

In the above-described embodiment, two annular grooves 38 and 39 and a plurality of radial grooves 40 are provided, but it is also possible to form one annular groove or two annular grooves. is there. It is also possible to provide one annular groove 38, 39 and a plurality of radial grooves 40 on the side surface of the second annular seal 34.

Further, in the above-described embodiment, the annular seal is provided in multiple layers on the side of the second annular side piece 30 of the first annular seal 21, but this multilayer annular seal is provided. To the first annular side piece 29 of the first annular seal body 21
And between the side surface of the recess 26.

[0041]

As described above in detail, according to the sealing device of the present invention, a plurality of annular seals are provided between the first annular seal having an M-shaped cross section and the end face of the bush. A seal surface that generates a relative slip between them and a seal surface that does not generate a relative slip on the end face of the bush where foreign matter enters are near, so that the sealing performance can be improved and its life can be extended Can be achieved.

Further, according to the seal constituting the seal device of the present invention, the sealing performance can be improved, the cost is low, and the assembling and replacing work is easy.

[Brief description of the drawings]

FIG. 1 is a front view of a hydraulic shovel including one embodiment of a sealing device of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a traveling body of the hydraulic shovel provided with the embodiment of the crawler belt sealing device of the present invention shown in FIG. 1;

FIG. 3 is a cross-sectional view showing, in an enlarged manner, a crawler belt connecting portion provided with an embodiment of the crawler belt sealing device of the present invention.

FIG. 4 is an enlarged cross-sectional view showing a crawler belt connecting portion provided with another embodiment of the crawler belt sealing device of the present invention.

FIG. 5 is a cross-sectional view showing, in an enlarged manner, a crawler belt connecting portion provided with still another embodiment of the crawler belt sealing device of the present invention.

FIG. 6 is an enlarged cross-sectional view showing a crawler belt connecting portion provided with another embodiment of the crawler belt sealing device of the present invention.

FIG. 7 is a view of a first annular seal member that constitutes another embodiment of the crawler belt sealing device of the present invention, as viewed from arrows VII-VII shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running body 16 Crawler belt 19 Inner link part 20 Outer link part 23 Bush 24 Connection shaft 26 Depression part 28 Seal device 29 First annular side piece part 30 Second annular side piece part 31 V-shaped annular connection part 32 M-shaped first annular seal body 33 Relative sliding seal surface 34 Second annular seal body 35 Third annular seal body 36 Fourth annular seal body 37 Projection

Claims (4)

[Claims] 1. An inner link portion of one track link is fixed to both ends of a cylindrical bush, a connecting shaft is rotatably inserted into the bush, and the other track link is connected to both ends of the connecting shaft. In a crawler belt having an outer link portion fixed, a peripheral surface and a side surface forming an annular space of the outer link portion in an annular space formed between a recess of the outer link portion and a bush in each of the track links. V-shaped cross section connecting the first annular side piece that contacts the first annular side piece, the second annular side piece located on the end face side of the bush, and the first annular side piece and the second annular side piece. A first annular seal member having an M-shaped cross-section and a second annular side piece constituting the first annular seal member and an end surface of the bush; Ring forming a typical sliding seal surface A crawler belt sealing device provided with a seal comprising an annular seal body and a third annular seal body. 2. An inner link portion of one of the track links is fixed to both ends of a cylindrical bush, and a connecting shaft is rotatably inserted into the bush. In a crawler belt having an outer link portion fixed, a peripheral surface and a side surface forming an annular space of the outer link portion in an annular space formed between a recess of the outer link portion and a bush in each of the track links. V-shaped cross section connecting the first annular side piece that contacts the first annular side piece, the second annular side piece located on the end face side of the bush, and the first annular side piece and the second annular side piece. A first annular seal member having an M-shaped cross-section, comprising a first annular seal member, a second annular seal member located on a second annular side portion constituting the first annular seal member, A third annular shell located on the end face side of the bush Between the second annular seal and the third annular seal, and the second annular seal is provided between the second annular seal and the third annular seal.
Alternatively, a crawler belt sealing device is provided with a seal comprising a fourth annular seal member forming a sliding seal surface relative to the third annular seal member. 3. An inner link portion of one of the track links is fixed to both ends of a cylindrical bush, and a connecting shaft is rotatably inserted into the bush. Fix the outer link,
In a crawler belt seal device in which a seal is housed in an annular space formed between a concave portion of an outer link portion and a bush end face of each track link, the seal is a peripheral surface forming an annular space of the outer link portion. A first annular side piece contacting the side face and a second annular side piece located on the end face side of the bush;
A first annular seal body having an M-shaped cross section, the first annular seal body including a V-shaped annular connecting portion connecting the first annular side piece and the second annular side piece to each other; A second annular seal and a third annular seal which are provided between a second annular side piece constituting the first annular seal and an end face of the bush and constitute relative sliding seal surfaces. A seal for a crawler track seal device, comprising: 4. An inner link portion of one of the track links is fixed to both ends of a cylindrical bush, and a connecting shaft is rotatably inserted into the bush. Fix the outer link,
In a crawler belt seal device in which a seal is housed in an annular space formed between a concave portion of an outer link portion and a bush end face of each track link, the seal is a peripheral surface forming an annular space of the outer link portion. A first annular side piece contacting the side face and a second annular side piece located on the end face side of the bush;
A first annular seal body having an M-shaped cross section, the first annular seal body including a V-shaped annular connecting portion connecting the first annular side piece and the second annular side piece to each other; A second annular seal located on the side of the second annular side constituting the first annular seal; a third annular seal located on the end face side of the bush; and the second annular seal A fourth sliding seal surface provided between the body and the third annular seal body and constituting a sliding sealing surface relative to the second or third annular seal body;
A crawler belt sealing device seal comprising: