JP2007290659A - Track roller guard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To have protection function of a track roller or the like and to prevent derailing of a track by restricting position deviation of a track link relative to the track roller without causing wear of a link pin. <P>SOLUTION: A slide plate 30 is fixed to a guard plate 21 hangingly provided on a lower surface side of a track frame 3 so as to cover end surfaces of at least two track rollers 13 so as to be arranged between the adjacent track rollers 13. The slide plate 30 has an inclination surface 31 opposed to an outer side surface 9a of the track link 9, approximately continued to an inner side surface 16a of a flange part 16 formed on the end of the track roller 13 in viewed in a longitudinal direction of the track frame 3 and inclined in a direction opened toward a lower side of the guard plate 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a track roller guard that is provided in an undercarriage device for a tracked vehicle such as a hydraulic excavator and has both a function of protecting the track roller and the like and a function of preventing the crawler belt from being removed.

  2. Description of the Related Art Conventionally, for example, in a lower traveling body of a hydraulic excavator, track frames are provided on both left and right sides, idle wheels are arranged on one end side of each track frame, and drive wheels that are rotationally driven by a running motor are arranged on the other end side. A crawler belt is wound between the idler wheel and the drive wheel. The crawler belt is formed by endlessly connecting a pair of track links attached to the non-ground surface of the crawler plate in the left-right direction via link pins and a crawler belt bush. A plurality of track rollers that roll on the pair of track links are provided on the lower surface side, and flange portions are provided at both ends of each track roller so as to sandwich the pair of track links from both the left and right sides. Yes. Then, when the crawler is rotated by the rotation of the drive wheel, each track roller holds the pair of track links at the flanges provided at both ends thereof, and the crawler belt is moved between the idler wheel and the drive wheel. It comes to guide in.

  However, when only one of the crawler belts is driven while one of the crawler belts is stopped to cause the lower traveling body to perform a so-called steering travel, each of the crawler belts is in frictional contact with the road surface and the lower traveling body is steered. Because of the movement in the direction, a large sliding resistance (lateral external force) acts on each crawler from the road surface. May end up. In addition, even when the lower traveling body travels on an uneven road surface, each crawler belt vibrates greatly, and the track link of each crawler belt is displaced in the left-right direction with respect to the track roller. , You may get out of wheel.

  As a means for preventing such wheel removal, for example, there is a track roller guard proposed in Patent Document 1. As shown in FIG. 8, the track roller guard has, as its basic function, a function to prevent the sand, rocks and the like from directly colliding with the track roller from the outside. In addition, a guard member 103 that is suspended from the lower surface side of the track frame 102 so as to cover the end surface of the track roller 101 is provided. An abutting plate (sliding plate) 107 is attached to the side plate 104 of the guard member 103 with a slight gap d between the end surface of the track pin (link pin) 106 that connects the track link 105. Yes.

No. 7-26223

  In the track roller guard according to Patent Document 1, when a lateral load acts on the crawler belt 108 and the track link 105 is displaced in the left-right direction with respect to the track roller 101, the track pin 106 is moved to the abutting plate 107. By sliding contact, the positional deviation of the track link 105 with respect to the track roller 101 can be restricted, and the track link 105 can be prevented from coming off the track roller 101 and coming off the wheel.

  However, in the track roller guard according to Patent Document 1, when the positional deviation of the track link 105 with respect to the track roller 101 is regulated, the track pin 106 is brought into sliding contact with the abutting plate 107. Has the problem of wear.

  The present invention has been made to solve such problems, and has a protection function for the track roller and the like, and regulates the positional deviation of the track link with respect to the track roller without wearing the link pin. It is an object of the present invention to provide a track roller guard capable of preventing wheel removal.

In order to achieve the above object, the track roller guard according to the present invention comprises:
In the track roller guard which is provided in the front and rear direction of the track frame on the lower surface side of the track frame and protects a plurality of track rollers rolling on the track link of the track,
A guard plate that is suspended from the lower surface of the track frame so as to cover end surfaces of the plurality of track rollers, and is fixed to the guard plate so as to be disposed between adjacent track rollers of the plurality of track rollers. A rubbing plate,
The sliding plate is opposed to the outer surface of the track link and has an inclined surface that is inclined in a direction to open downward of the guard plate, and the inclined surface is formed at an end of the track roller. The track frame is substantially continuous with the inner surface of the flange portion as viewed in the front-rear direction of the track frame (first invention).

  In the present invention, it is preferable that the sliding plate is provided with a portion that overlaps with the flange portion when the track frame is viewed in the front-rear direction (second invention).

  In the present invention, the angle formed by the inclined surface of the sliding plate with the rotation center line of the track roller in the front-rear direction of the track frame is such that the inner surface of the flange portion forms the rotation center line of the track roller. It is preferable that the angle is substantially the same as or smaller than the angle (third invention).

  In the present invention, when a lateral load is applied to the crawler belt, the track link shoulder (the corner of the intersection of the tread surface and the outer surface) is pressed against the inner surface of the flange portion provided at the end of the track roller. . When the lateral load acting on the crawler belt further increases, the track link shoulder is slidably contacted with the inclined surface of the sliding plate that is substantially continuous in the longitudinal direction of the track frame on the inner surface of the flange portion, and the track link in the lateral direction of the track link. Misalignment is regulated. Here, since the inner surface of the flange portion and the inclined surface of the sliding plate are configured to be substantially continuous in the front-rear direction of the track frame, it is uncomfortable before and after the operation of regulating the positional deviation of the track link by the sliding plate. There will be no impact. Further, since the track link shoulder is generally hardened by heat treatment or the like, the wear on the track link side is minimized. According to the present invention, since the positional deviation of the track link is regulated by bringing the track link shoulder into sliding contact with the sliding plate, it is possible to prevent the crawler belt from being removed without wearing the link pin. In addition, the guard plate suspended from the lower surface of the track frame so as to cover the track roller can prevent the sand, rocks and the like from directly colliding with the track roller from the outside. Needless to say.

  In the second invention, the sliding plate is provided with a portion that overlaps with the flange portion of the track roller when the track frame is viewed in the front-rear direction, so that when a lateral load is applied to the crawler belt, the portion and the inner surface of the flange portion The track link shoulder is pressed against both. According to the second aspect of the invention, since the surface pressure acting on the flange portion can be lowered, the life of the track roller can be extended.

  By adopting the configuration of the third invention, interference between the link pin and the sliding plate can be avoided more reliably.

  Next, specific embodiments of the track roller guard according to the present invention will be described with reference to the drawings. In addition, although embodiment described below is an example by which this invention was applied to the hydraulic shovel as a tracked vehicle, it is not limited to this, For example, it can apply widely also to tracked vehicles, such as a bulldozer. it can.

  FIG. 1 is a left side view of a lower traveling body of a hydraulic excavator according to an embodiment of the present invention. Moreover, FIG. 2 shows a cross-sectional view taken along the line AA in FIG.

  In the lower traveling body 1 of the hydraulic excavator shown in FIG. 1, a track frame 3 (left side) that extends in the front-rear direction on both sides of a center frame (not shown) that serves as a mounting base for a turning device 2 that turns an upper turning body (not shown). Only shown). In each track frame 3, an idler (idle wheel) 4 is rotatably provided at a front end portion thereof, and a sprocket (driving wheel) 6 that is rotationally driven by a traveling hydraulic motor 5 is provided at a rear end portion thereof. Yes. A crawler belt 7 is wound between the idler 4 and the sprocket 6, and the crawler belt 7 is spaced apart in the left-right direction on the non-grounding surface of the crawler plate 8 as shown in FIG. 2. A pair of track links 9 to be attached are connected endlessly via a link pin 10 and a crawler belt bush 11.

  The intermediate portion in the front-rear direction of the track frame 3 has a box-like structure with a square cylindrical cross section, and as shown in FIG. 1, a required number (three in this example) of carrier rollers are provided on the upper surface side. 12, a plurality (eight in this example) of track rollers 13 rolling on the track link 9 are provided on the lower surface side of the track frame 3 at a predetermined interval. . Each track roller 13 is rotatably attached to a shaft 15 supported by a shaft support member 14 fastened to the lower surface plate 3 a of the track frame 3. As shown in FIG. 2, flanges 16 are provided at both ends of each track roller 13 so as to sandwich the pair of track links 9 from the left and right sides. Here, the inner side surface 16 a of the flange portion 16 is a partial conical surface that forms an obtuse angle with respect to the rolling surface 17 of the track roller 13. The corner of the intersection of the inner surface 16a of the flange 16 and the rolling surface 17 is rounded.

  In each track link 9, the corner portion 9 c (hereinafter, referred to as “crossing”) between the outer surface 9 a having a boss formed on the periphery of the insertion hole of the link pin 10 and the tread surface 9 b contacting the rolling surface 17 of the track roller 13. The "track link shoulder 9c") has an R chamfer that is substantially the same as or slightly larger than the R chamfer provided at the corner of the intersection of the inner surface 16a of the flange 16 and the rolling surface 17. Has been. The tread surface 9b and the track link shoulder portion 9c are hardened by heat treatment or the like.

  As shown in FIG. 1, a track roller guard 20 for protecting the plurality of track rollers 13 and the like is provided on the lower surface side of the track frame 3. The track roller guard 20 includes track roller guard divided bodies 20a, 20b, and 20c that are divided into three in the front-rear direction of the track frame 3. Since these track roller guard divided bodies 20a, 20b, and 20c have the same basic structure, the track roller guard divided body 20c disposed on the rearmost side will be described below as a representative.

  As shown in FIG. 3, the track roller guard divided body 20c includes a pair of left and right guard plates 21 suspended from the lower surface side of the track frame 3 so as to cover the end surfaces of at least two adjacent track rollers 13. A connecting plate 22 that is located between the guard plates 21 and connects the guard plates 21, a bracket 23 that is joined to the upper end of each guard plate 21, and a required reinforcement that is joined to the outer surface of each guard plate 21. And a rib 24, which is fixed to the track frame 3 by tightening a bolt 26 that passes through the bracket 23 and is screwed to a lower surface plate 3 a of the track frame 3 or a tapped block 25 fixed to the track frame 3. Has been. In this way, the guard plate 21 can prevent the sand, rocks, and the like from directly colliding with the track roller 13 and the like from the outside.

  Each guard plate 21 is provided with a notch 21 a so as to avoid interference with the shaft support member 14 in order to place the guard plate 21 close to the end surface of the track roller 13. Further, a sliding plate 30 is fixed to the inner side surface of each guard plate 21 so as to be disposed between adjacent track rollers 13. As shown in FIG. 4, the sliding plate 30 includes a flat plate portion 30 a whose thickness dimension is set so as to overlap the flange portion 16 when viewed from the front-rear direction of the track frame 3, and an outer surface 9 a of the track link 9. And an inclined plate portion 30b having an inclined surface 31 facing the surface. Here, the inclined surface 31 is substantially continuous with the inner side surface 16 a of the flange portion 16 in the front-rear direction of the track frame 3 and is inclined outward toward the lower side of the guard plate 21.

  In the present embodiment, as shown in FIG. 5, the angle α formed by the inclined surface 31 of the sliding plate 30 and the rotation center line O of the track roller 13 in the front-rear direction of the track frame 3 is The angle β is smaller than the angle β formed between the inner surface 16 a of the flange portion 16 and the rotation center line O of the track roller 13. In this way, as shown in FIG. 4, there is a gap between the inclined surface 31 of the sliding plate 30 and the end surface of the link pin 10, and the interference between the link pin 10 and the sliding plate 30 can be avoided more reliably. Can do.

  Further, in the present embodiment, as shown in FIG. 4, a predetermined gap D is provided between the flat plate portion 30 a and the track link shoulder portion 9 c in the sliding plate 30. Here, until a wear amount corresponding to the gap D is reached from a state where the wear amount of the inner surface 16a of the flange portion 16 is zero, when the lateral load is applied to the crawler belt 7, the flange portion The track link shoulder 9c is pressed only against the inner surface 16a of the 16. Further, after the wear amount of the inner surface 16a of the flange portion 16 reaches the wear amount corresponding to the gap D, when a lateral load is applied to the crawler belt 7, the inner surface 16a of the flange portion 16 and The track link shoulder 9c is pressed against both the flat plate portion 30a of the sliding plate 30. Therefore, after the amount of wear of the inner surface 16a of the flange portion 16 reaches the amount of wear corresponding to the gap D, the surface pressure acting on the flange portion 16 can be reduced, and the life of the track roller 13 is extended. Can do. Note that the track link shoulder portion 9c is formed on both the inner surface 16a of the flange portion 16 and the flat plate portion 30a of the sliding plate 30 when a lateral load is applied to the crawler belt 7 from the initial stage with the gap D set to zero. You may make it press.

  In the track roller guard 20 configured as described above, when a lateral load is applied to the crawler belt 7 when the lower traveling body 1 travels by steering or travels on rough terrain, the track roller guard 20 The track link shoulder portion 9c is pressed against the inner side surface 16a of the flange portion 16 provided at the end portion of 13. When the lateral load acting on the crawler belt 7 further increases, as shown in FIG. 6, the track link is provided on the inclined surface 31 of the sliding plate 30 that is substantially continuous with the inner surface 16 a of the flange portion 16 in the longitudinal direction of the track frame 3. The shoulder portion 9c is brought into sliding contact with the track link 9 so that the lateral displacement of the track link 9 is restricted. In this way, since the positional deviation of the track link 9 is regulated by sliding the track link shoulder 9c against the inclined surface 31 of the sliding plate 30, it is possible to prevent the crawler belt 7 from being removed without wearing the link pin 10. Can do. Since the inner side surface 16a of the flange portion 16 and the inclined surface 31 of the sliding plate 30 are substantially continuous in the front-rear direction view of the track frame 3, the contact partner surface of the track link shoulder portion 9c is the flange portion. The movement from the inner surface 16a of the sliding plate 30 to the inclined surface 31 of the sliding plate 30, and the movement of the movement from the inclined surface 31 of the sliding plate 30 to the inner surface 16a of the flange portion 16, on the other hand, causes unpleasant impacts, respectively. It is performed smoothly without generating. Further, since the track link shoulder 9c is hardened by heat treatment or the like, the amount of wear on the track link 9 side can be minimized.

  Further, the angle α formed between the inclined surface 31 of the sliding plate 30 and the rotation center line O of the track roller 13 is made smaller than the angle β formed between the inner surface 16 a of the flange portion 16 and the rotation center line O of the track roller 13. (See FIG. 5), as shown in FIG. 7, the inclination of the crawler belt 7 with respect to the track roller 13 is allowed to a predetermined angle θ.

The left view of the lower traveling body of the hydraulic excavator concerning one embodiment of the present invention. AA arrow main part sectional drawing of FIG. The perspective view explaining the schematic structure of a track roller guard B part enlarged view of FIG. Inclination angle comparison diagram of sloping surface of sliding plate and inner surface of flange part The figure explaining the position deviation regulation operation of the track link A figure showing a state in which the crawler belt is inclined with respect to the track roller Illustration of prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower traveling body 3 Track frame 7 Crawler belt 9 Track link 9c Track link shoulder part 10 Link pin 13 Track roller 16 Flange part 16a Inner side surface (flange part)
20 track roller guards 20a to 20c track roller guard divided body 21 guard plate 30 sliding plate 30a flat plate portion 30b inclined plate portion 31 inclined surface (sliding plate)

Claims (3)

In the track roller guard which is provided in the front and rear direction of the track frame on the lower surface side of the track frame and protects a plurality of track rollers rolling on the track link of the track,
A guard plate that is suspended from the lower surface of the track frame so as to cover end surfaces of the plurality of track rollers, and is fixed to the guard plate so as to be disposed between adjacent track rollers of the plurality of track rollers. A rubbing plate,
The sliding plate is opposed to the outer surface of the track link and has an inclined surface that is inclined in a direction to open downward of the guard plate, and the inclined surface is formed at an end of the track roller. A track roller guard characterized by being substantially continuous with the inner side surface of the flange portion as viewed in the front-rear direction of the track frame.   The track roller guard according to claim 1, wherein the sliding plate is provided with a portion that overlaps with the flange portion when the track frame is viewed in the front-rear direction.   The angle formed by the inclined surface of the sliding plate with the rotation center line of the track roller as viewed in the front-rear direction of the track frame is substantially the same as the angle formed by the inner surface of the flange portion with the rotation center line of the track roller, or The track roller guard according to claim 1 or 2, wherein the track roller guard is smaller than that.

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