JP3106814B2 - Crawler crawler track - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler belt for a hydraulic shovel and other crawler type working machines.

[0002]

2. Description of the Related Art A crawler type working machine such as a hydraulic excavator is provided with a crawler belt as a traveling body. The track is
It is configured by sequentially connecting a track link with a shoe pivotally using a connecting pin, and is provided wound around between a drive tumbler and an idler,
The traveling body is caused to travel by rotating the drive tumbler and feeding the crawler belt. Each shoe constituting the crawler belt is provided with a driving claw that is engaged with the tooth portion of the drive tumbler, and the driving claw is applied to the crawler belt by engaging the tooth portion of the drive tumbler with the driving claw of the shoe. To exert. A plurality of upper rollers and lower rollers are provided at positions between the drive tumbler and the idler on the traveling body, respectively.
These rollers roll at positions on both sides of the driving claw of each shoe constituting the crawler belt.

[0003]

By the way, the working machine does not always travel on the flat ground, but often travels on the ground under extremely poor running conditions such as sloping ground and unevenness. For this reason, although the crawler belt is guided by the upper roller and the lower roller between the drive tumbler and the idler, a force may be applied to the crawler belt in a direction other than the traveling direction depending on running conditions. Anyway,
The drive claws with which the rollers are engaged are provided at a predetermined pitch interval from each other, so that when the roller is located at the transition between the drive claws, When a force is applied, the relative positional relationship between the roller and the driving claw is shifted. If the roller is slightly displaced, the edge of the roller slides or comes into contact with the driving claw, which not only accelerates the wear of the driving claw, but also generates noise and connects the track link by impact. There are inconveniences such as deformation of the pins, and in severe cases, there is a problem that the driving claws are damaged.

In view of the above points, the present applicant has filed Japanese Patent Application No.
-322326, a roller guide forming a rolling surface of a roller is recessed at both left and right positions of a driving claw protruding from a shoe having a track link, and is provided between a drive tumbler and an idler. It has been proposed that the upper and lower rollers can be driven in a state where the upper and lower rollers do not hit a driving claw constituting a crawler belt. As a result, during traveling of the working machine, the rollers are restricted by the side wall portions on both sides of the roller guide, and are reliably rolled along the roller guide, so that there is no possibility of collision with the driving claw,
Inconveniences such as abrasion and damage of the driving claw can be reliably prevented, and an effect of extending the life of the driving claw is achieved.

[0005] However, the above-described configuration is not without its problems. That is, when the working machine travels under normal conditions, there is no particular problem.However, when traveling in an overloaded state, the roller moves to some extent in the left and right direction within the roller guide. If not, excessive loads will be applied to the rollers and tracks. Also, if the depth from the surface of the shoe to the bottom of the roller guide is too large, the pedestal may interfere with the shoe when the vehicle is tilted. Must be restricted. For this reason, the rollers may move considerably within the roller guide depending on the running conditions, albeit to a limited extent by the roller guide. The lateral movement of the shoe of the roller may cause the drive claw to be worn out early by sliding on the side surface of the drive claw, or may hit the groove end portion of the roller guide by the floating of the roller from the roller guide. There is also a possibility that inconveniences such as the presence of a problem may occur.

The present invention has been made in view of the above points, and an object of the present invention is to enable a roller to be more reliably kept out of contact with a driving claw, and to provide a groove end of a roller guide. Is to keep it from hitting.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, according to the present invention, a track link provided with a shoe provided with a driving claw which is engaged with a drive tumbler is sequentially pivotally connected by a connection pin. A crawler belt that forms a traveling body of a crawler-type working machine, wherein each shoe has a rolling surface for upper and lower rollers at both sides of a protruding portion of a driving claw thereof. The guide is recessed and this row
The guide in the direction perpendicular to the running direction of the lower roller
A regulating wall that regulates
Opposite side located on the opposite side to the side facing this regulation wall
Surface in the same direction, and the side opposite to these regulating walls
Distance between these rollers and the opposite side of the roller.
Not wider than the spacing between the facing walls, and the inclination angle of the regulating wall
When the roller is lifted from the roller guide,
Even when the roller contacts the opposite side, the edge of this roller
From the transition from the surface of the
The feature is that the angle is set so as to be located inside the roller guide .

[0008]

As described above, by providing the roller guide in the shoe, the upper and lower rollers are always regulated by the left and right walls forming the roller guide. The deviation of the relationship is reliably prevented, the roller does not contact the driving claw, and wear and damage of members such as the driving claw and the roller can be reliably prevented. In addition, the width of the roller guide can be displaced to a certain extent in a direction perpendicular to the rolling direction of the roller, so that no excessive force acts due to the regulation of the roller. And although the roller can be displaced in the direction perpendicular to the rolling direction, even if this roller is displaced to the most deviated left and right position, it is kept in a non-contact state with the side surface of the driving claw. The wear on the side surface is prevented, and the protection of the driving claw is further improved. Even if the roller is lifted from the roller guide, its end is located inside the groove end of the roller guide. There is no inconvenience such as damage or noise.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, FIG. 1 shows a hydraulic excavator as an example of a crawler type working machine. However, in this figure,
The front working mechanism is omitted.

In FIG. 1, reference numeral 1 denotes a traveling body, and 2 denotes a revolving body. The revolving body 2 is installed on the traveling body 1 so as to be revolvable. 3 is provided at a front position, and a drive mechanism such as an engine and a hydraulic pump and other devices are installed at a rear position. On the other hand, the traveling body 1 has a drive tumbler 10 and an idler 11 arranged in front and back, and a crawler belt 12 wound around the drive tumbler 10 and the idler 11. 12, so that the vehicle can travel. Further, in order to guide a portion of the crawler belt 12 between the drive tumbler 10 and the idler 11, the traveling body frame 13 is provided with a plurality of upper rollers 14 and lower rollers 15. These upper roller 14 and lower roller 1
5 is a pair of rolling parts 14a, 14a and 15a, respectively.
15a, and the connecting portions 14b and 15b reduced in diameter therebetween (see FIG. 4).

FIG. 2 shows a part of the crawler belt 12, and FIG. 3 shows the appearance of the track link 20 constituting the crawler belt 12. The crawler belt 12 constitutes an infinite traveling track by sequentially connecting the track links 20 so as to be pivotable. The track link 20 is formed by extending a plurality of connecting portions 22 on both sides of the shoe 21. The connecting portion 22 is located at a position where the other connecting portion is not formed. The crawler belt 12 is formed by inserting the connecting pins 23 between the connecting portions 22 of the links 20 and 20 so as to be sequentially connected in a loop shape.

At the center of the shoe 21 of the track link 20, a driving claw 24 is provided so as to engage with the teeth of the drive tumbler 10. In addition, the driving claw 24
Roller guides 25 are formed on both sides of the position where is provided. When the crawler belt 12 is formed, the roller guide 25 serves as a rolling portion 1 of the upper roller 14 and the lower roller 15.
4a and 15a serve as rolling paths for rolling, and by recessing a part of the connecting portion 22a of the shoe 21 and the connecting portion 22 which is closest to the portion where the driving claw 24 is provided. It is formed. Therefore, these rollers 14 and 15
The rolling portions 14a and 15a roll on the roller guide 25 so that the continuous portions 14b and 15b straddle the driving claw 24.

As is clear from FIGS. 4 to 6, the roller guide 25 forms a horizontal rolling surface 25a in the shoe 21 and step portions on both left and right sides of the rolling surface 25a. Consisting of regulating walls 25b, 25b,
The rollers 14 and 15 are formed by the regulating wall 25b so that the rolling surfaces 2
5a. Further, in the portion of the connecting portion 22a, the shoe 21
The rolling surface 25c is formed so as to be continuous with the rolling surface 25a, and a restricting wall 25d is formed on one side of the rolling surface 25c. Further, as the other regulating wall, the wall of the connecting portion 22b of the track link 20 of the other party exhibits its function. In addition, when the crawler belt 12 is formed by the track link 20, the roller guide 25 has a loop shape and extends over its entire length, and the regulating walls for the rollers 14 and 15 are substantially in a continuous state. Here, the rolling surface 25
The distance between the regulating walls 25b, 25b, which define and define the a and 25c, and the distance between the regulating wall 25d and the wall surface of the connecting portion 22b are somewhat larger than the width of the rolling portions 14a, 15a of the rollers 14,15. ing.

The track link 2 configured as described above
The crawler belt 12 provided with the crawler belt 0 is wound between the drive tumbler 10 and the idler 11 in the traveling body 1, and the drive claw 24 of the track link 20 constituting the crawler belt 12 is driven by rotating the drive tumbler 10. Since the crawler belt 12 is engaged with the teeth of the tumbler 10, the crawler belt 12 is fed following the rotation of the drive tumbler 10, and the traveling body 1 travels. Also, the drive tumbler 10 and the idler 11 are far apart from each other.
An upper roller 14 and a lower roller 15 are provided at a position between the zero and the idler 11, and the crawler belt 12 is guided so as not to be displaced.

By the way, since the traveling body 1 does not always travel on flat ground, but rather travels on sloped ground or uneven ground, the crawler belt 12 is used for traveling of the vehicle. A force is applied in a direction other than the direction, and the crawler belt 12 tends to shift in either the left or right direction. However, the rolling portions 14a of the upper roller 14 and the lower roller 15
Since the roller 15a rolls along the roller guide 25, the crawler belt 12 can be prevented from shifting. In addition, since the left and right sides of the rolling surfaces 25a and 25c of the roller guide 25 are regulated by the regulating walls 25b and 25d, they surely roll on the roller guide 25. There will be no deviation from the regulatory wall.

Here, if the displacement of the crawler belt 12 is completely restricted, smooth running is hindered. For this,
The rollers 14, 15, especially the lower roller 15, need to allow a certain amount of movement of the roller guide 25 in a direction perpendicular to the running direction, that is, in the left-right direction. Also, when the entire vehicle body moves in the direction of overturning due to an overload or the like, as shown in FIG.
In order to prevent the 5P portion from interfering with the surface of the shoe 21, the roller guide 25 cannot be so deep.

As described above, when the lower roller 15 can be moved in the left-right direction with respect to the roller guide 25, when the lower roller 15 is deviated to the left or right, the side surface of the lower roller 15 and the driving claw 24 comes into sliding contact with each other, and the wear on the side surface of the drive claw 24 proceeds. If the roller guide 25 has a shallow groove,
When the lower roller 15 and the shoe 21 relatively move up and down, the lower roller 15 may rise above the upper surface of the shoe 21. When the lower roller 15 is displaced in the sinking direction from the raised state, the edge of the lower roller 15 The portion may abut the groove end of the roller guide 25.

In the present invention, the above-described inconvenience is prevented by configuring the lower roller 15 and the roller guide 25 as follows. First, as is clear from FIG. 8, even if the lower roller 15 is located at the center of the roller guide 25 (the state shown by a solid line in the figure), the lower roller 15 is Even when the guide 25 is moved to a position biased toward the regulation wall 25b (a state shown by a virtual line in the drawing), the guide 25 is held in a non-contact state with the side surface 24a of the driving claw 24. I have. That is, the distance from the outside of one of the rolling part 15a of the lower roller 15 to the inside of the other rolling unit 15a and B _1, the rolling surface 25a of the regulating wall 25b of the roller guide 25
A transition portion X to, restriction wall 25b of the drive pawl 24 is the distance to the side surface 24a on the opposite side and B ₂ is a side 24a facing, theta ₁ the inclination angle of the opposite sides 24a of the driving pawl 24, under When the inclination angle of the side surface of the roller 15 is θ ₂ , B ₁ > B
_Two It is set so as to satisfy the relationship of θ ₁ ≦ θ ₂ . As a result, the driving claw 24 is
5, the predetermined distance C is formed between the transition from the driving claw 24 to the roller guide 25 and the inner end of the lower roller 15, so that the lower roller 15 Thus, the side surface 24a of the driving claw 24 is kept out of contact with the side surface 24a, so that the side surface 24a is prevented from being worn.

Next, when the lower roller 15 is displaced in a direction sinking into the roller guide 25 from a state in which it floats up from the roller guide 25, the edge of the lower roller 15 does not hit the groove end of the roller guide 25. For this purpose, the configuration is as shown in FIG. That is, the shoe 21
Of the drive pawl 24 along a line P parallel to the shoe 21 including a transition portion Y from the surface of the roller guide 25 to the regulating wall 25b of the roller guide 25.
Assuming that an intersection with the side surface 24a of the lower roller 15 (the side opposite to the side facing the regulation wall 25b) is Z, the inner end of one rolling portion 15a of the lower roller 15 contacts at the position of the intersection Z. Is set such that the outer end of the other rolling portion 15a is located inside the transition portion Y. Thus, when the depth of the roller guide 25 is H and the angle of the regulating wall 25b is θ ₃ , a transition portion X from the regulating wall 25b to the rolling surface 25a is formed.
L ₁ (= H / tan θ ₃ ) from the surface of the shoe 21 to the transition portion Y to the regulating wall 25 b, and the distance L from the inner end S of the rolling portion 15 a of the lower roller 15 to the intersection Z. ₂ (= H
/ Tan θ ₁ ) + C (however, see FIG. 8 for C), it is set so as to have a relationship of L ₁ > L ₂ + C.
With this configuration, even if the lower roller 15 moves up and down with respect to the roller guide 25, the lower roller 1
There is no danger that the edge of the roller 5 will hit the groove end of the roller guide 25.

With the above configuration, the rolling portions 14a, 15a of the rollers 14, 15 can be
And the driving claw 24 can be reliably maintained in a non-contact state,
Particularly, the lower roller 15 and the driving claw 2 on which a large load acts.
4 can be prevented from sliding and its wear and damage can be reliably prevented. Even if the lower roller 15 moves up and down with respect to the roller guide 25, the edge of the lower roller 15 is These members are also protected without hitting the groove ends of the groove 25, and furthermore, for example, the deformation of the connecting pin 23 can be prevented, and the generation of noise due to the impact sound is suppressed.

[0021]

As described above, according to the present invention, the roller guides forming the rolling surfaces of the upper and lower rollers are provided on the shoe of the track link constituting the crawler belt at both sides of the projecting portion of the driving claw. The roller is displaceable in a direction perpendicular to the rolling direction of the roller by a predetermined range, and at the position where the lower roller is most deviated in any direction, the lower roller is in contact with the side surface of the driving claw. Even when the lower roller rises from the roller guide and comes into contact with the driving claw, it is formed so as to be located inside the groove end of the roller guide. The roller is regulated by the side wall portions on both sides of the roller guide and reliably rolls along the roller guide, and even if the lower roller is biased left and right, the lower roller is reliably kept in a non-contact state with the driving claw. From being Inconveniences such as wear and damage of the driving claw can be reliably prevented, and when the lower roller moves up and down with respect to the roller guide, the edge of the lower roller hits the groove end of the roller guide. Since there is no collision, various effects such as reduction of noise and protection of each member constituting the traveling body are achieved.

[Brief description of the drawings]

FIG. 1 is an external view of a hydraulic shovel as an example of a crawler type working machine.

FIG. 2 is a plan view of a crawler belt.

FIG. 3 is an external perspective view of a track link.

FIG. 4 is a sectional view taken along line XX of FIG. 2;

FIG. 5 is a sectional view taken along line YY of FIG. 2;

FIG. 6 is a sectional view taken along the line ZZ of FIG. 2;

FIG. 7 is an operation explanatory diagram showing a state in which the lower roller is tilted due to overload of the vehicle.

FIG. 8 is a diagram illustrating a relationship between the lower roller and a roller guide when the lower roller is biased in the left-right direction.

FIG. 9 is a diagram illustrating a relationship between the lower roller and a roller guide when the lower roller moves up and down.

[Explanation of symbols]

 Reference Signs List 1 running body 10 drive tumbler 11 idler 12 crawler belt 14 upper roller 15 lower roller 20 track link 21 shoe 22, 22a, 22b connecting portion 23 connecting pin 24 driving claw 24a side surface 25 roller guide 25a, 25c rolling surface 25b, 25d regulating wall

Claims (1)

(57) [Claims] 1. A crawler track formed by sequentially connecting a track link provided with a shoe having a driving claw engaged with a drive tumbler so as to be pivotable with a connecting pin, and constituting a traveling body of a crawler type working machine. in the each shoe, on both sides the position of the projecting portion of the drive pawl, recessed roller guide which forms the rolling surface of the upper and lower rollers, the Roraga
The movement in the direction perpendicular to the running direction of the lower roller
Forming a regulating wall for regulating the
Opposite on the opposite side of the claw from the side facing this regulation wall
Incline the side surface in the same direction, and
Set the distance between the roller and the side opposite to these regulating walls of the roller.
The distance between the walls facing each other should not be wider than
The inclination angle of the control wall is such that the roller is
Even when it comes into contact with the opposite side in a floating state,
The edge of the roller is moved from the surface of the shoe to the row.
Position inside the roller guide from the transition of the guide to the control wall
The crawler track of a crawler-type working machine, wherein the crawler-type working machine is configured to have such an angle as to be placed .