JPH0649285U - Idler wheel support structure - Google Patents

Abstract

(57) [Summary] [Purpose] Even if it is a box type truck frame,
It is intended for an idler wheel support structure that makes it easy to adjust the worn parts. [Constitution] The idle wheel shaft 1 of the tracked vehicle is supported by the left and right supports 2,
Track frame 4 supported by 3 and having a box-shaped cross section
In the idle wheel support structure that slides in the front-rear direction inside, the first slopes 5 and 6 formed on the side portions of the left and right supports 2 and 3
And the second slopes 9 and 10 facing the upper portions of the first slopes 5 and 6.
And a bracket 11 for supporting the holding members 7, 8 inside the track frame 4, and an adjusting shim 12 between the holding members 7, 8 and the bracket 11.
To maintain the first slopes 5 and 6 and the second slopes 9 and 10 in an appropriate gap s. [Effect] The gap due to the wear of the first slope and the second slope can be adjusted by the shim only by removing the crawler belt, which improves the maintainability and thus the work efficiency.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an idler wheel support structure for a construction machine equipped with a crawler belt, and more particularly to an idler wheel support structure in which a wear portion due to friction during sliding can be adjusted in one place.

[0002]

[Prior art]

 As shown in FIGS. 6 to 8, a conventionally used idle wheel support structure has a floating frame at the front portion of a track frame 31 formed in a box shape in the undercarriage portion of a power shovel or the like. The track 34 is provided with a support 34 having a yoke shape on both sides of the shaft 33 of the wheel 32, and a spring 36 provided on the other end as a rod-shaped grease cylinder shaft 35 on the other side. The frame 31 is adapted to be bufferably supported. In this case, the yoke-shaped upper and lower surfaces 37 and 38 of the support 34, which serve as the vertical load receiving portion of the idler wheel 32, are formed in the longitudinal direction of the four corners of the track frame 31 in the box shape. The upper and lower parts 40 and 41 of the angle-shaped member 39 welded to the respective parts are slidable in correspondence with each other, and the left-right direction load receiving part is a yoke-shaped part of the support 34. It is performed between the upper and lower step portions 42 and 43 and the member 39 of the track frame 31. The thrust load (from the Y direction) from below the idler wheel 32 is received by both sides of the upper surface 37 of the support 34 and the lower surface 40a of the upper portion 40 of the member 39 of the track frame 31, and the collision load from the front ( (X direction) and when debris or the like is caught between the crawler belt 44 and the idler wheel 32, or between the rolling wheels 45, the same load is applied as in a frontal collision, and the idler wheel 32 passes through the support 34. The spring 36 and the like are contracted to absorb the front load.

[0003]

[Problems to be solved by the device]

 When such a load is applied, the upper and lower surfaces 37, 38 of the support 34 and the upper and lower members 39, 39 of the track frame 31 are slid (forward f, backward e) as described above. However, the lateral load (Z direction) of the idler wheel 32 during turning of the vehicle body is received by the side surfaces 42, 43 of the support 34 by the side surface of the member 39 of the track frame 31. However, these loads become a composite load of X, Y and Z, and wear the load receiving member and the sliding member. In this case, as shown in FIG. 9, if the bearing 46 of the idle wheel shaft 33 is provided outside the track frame 47, it can be repaired by the shim 48 and the wear exchange material 49, but it is exposed. Therefore, there is a drawback that abrasion due to sedimentation increases, and the types shown in FIGS. 6 to 8 are currently used. That is, in this type, the track frame 31 is formed in a box shape including an idler wheel 32, a support 34 having a yoke, and a cushioning means 36 such as a spring, so that the sliding portion of the yoke is formed. Since there is no sediment buildup on the ground, it can be made less expensive and less expensive than the type shown in Fig. 9, but it has the drawback that it cannot be repaired and adjusted when worn due to the box shape. Therefore, in the case of the box type, if the yoke idler bearing is worn, after extensive disassembly such as removing the track and idler, replace the bearing with a new one or use the track frame. It was necessary to repair new steel materials by welding on the flat parts of the upper and lower four corners of the inside.

In view of this, the present invention provides a idle wheel support structure that facilitates adjustment of a worn portion even in a box-type track frame to solve the drawbacks of the prior art. It was made for the purpose.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an idler wheel support structure in which an idler wheel shaft of a tracked vehicle is supported by left and right supports and slid forward and backward in a track frame having a box-shaped cross section. A holding member having a first slope formed on the side portions of the left and right supports and a second slope facing the upper portion of the first slope, and supporting the holding member inside the track frame. A bracket is provided, and an adjusting shim is provided between the restraining member and the bracket to hold the first slope and the second slope in an appropriate gap.

[0006]

[Action]

 According to the above construction, when the first slope of the support and the second slope of the restraining member are worn by sliding, and the gap between the first slope and the second slope exceeds an appropriate value, the adjustment shim. Repairs easily.

[0007]

【Example】

 1 is a front sectional view showing an embodiment of an idler wheel support structure according to the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a perspective view of the cover of FIG. 2, and FIG. 2 is a front sectional view of the second embodiment, FIG. 5 shows another embodiment in which only the first slope and the second slope of FIG. 1 are arranged, and (a) shows that the first and second slopes are higher inward, b) is a front view when the first and second slopes are raised outward.

Hereinafter, the present invention will be described with reference to the embodiments shown in FIGS. The idler wheel support structure according to the present invention supports the idler wheel shaft 1 of a tracked vehicle by the left and right supports 2 and 3 and slides it in the front-back direction within a track frame 4 having a box-shaped cross section. In an idler wheel support structure, a restraint having first slopes 5 and 6 formed on the sides of the left and right supports 2 and 3 and second slopes 9 and 10 facing the upper portions of the first slopes 5 and 6. It is provided with members 7 and 8 and a bracket 11 that supports the holding members 7 and 8 inside the track frame 4, and an adjustment shim 12 is provided between the holding members 7 and 8 and the bracket 11. In addition, the first slopes 5 and 6 and the second slopes 9 and 10 are held in the proper gap s.

An idle wheel 13 is rotatably fitted on the idle wheel shaft 1 via a bush 14, and supports 2 and 3 are attached to the left and right sides at both ends. An oil hole 1a is provided in the shaft center of the idler wheel shaft 1, and the oil hole 1a communicates with a floating seal 15 provided between the left and right sides of the idler wheel 13 and the opposing supports 2 and 3, respectively. The holes 1b are provided at right angles to each other. An oil sump 16 is provided on the boss portion of the idler wheel 13, and a hole 17 communicating with the floating seal 15 is provided from there. The idle wheel shaft 1 and the supports 2 and 3 each have a screw at one end and a taper-shaped bolt 18 penetrating from the other end to the threaded portion through one hole of the support 2. The nut 19 is used to prevent rotation, and the nut 19 is integrally mounted on the upper surface of the track frame 4 so as to be slidable back and forth. A mountain-shaped inclined surface is formed on the outside of the supports 2 and 3 in the front-rear direction, and first inclined surfaces 5 and 6 made of wear plates are fixed to each of the left and right sides by welding or the like to form an integral body. Has become. A horizontal portion of a bracket 11 bent at a right angle is welded to the track frame 4 so as to face inward, and mounting surfaces 7a and 8a are provided on the upper surface of the bracket 11, and the first slopes 5 and 6 are provided on the hanging lower portion. Suppressing members 7 and 8 having second slopes 9 and 10 serving as wear plates are provided so as to be overlapped with each other. Therefore, the center of the upper surface of the bracket 11 is cut out in order to allow the restraining members 7 and 8 to escape. Further, a box-shaped cover 20 having a triangular cross section is provided on the upper portion of the bracket 11 to prevent dirt and the like from entering through the bracket 11 provided on the track frame 4. The bracket 11 and the restraining members 7 and 8 are attached by the four bolts 21 and the adjusting shim 12. The inner two of the four bolts 21 are the cover 20. Regardless of whether the head is exposed outside the track frame 4 because the outer two are tightened together through the holes in the recesses 22 provided in the cover 20. Will be done. The first slopes 5 and 6 and the second slopes 9 and 10 are attached by adjusting shims 12 so that a proper clearance s is always maintained.

Next, the operation will be described. When the idler wheel 13 receives a thrusting load from below, the first slope 5 contacts the second slope 9 and the first slope 6 contacts the second slope 10. Therefore, if this is repeated, the slopes wear. Also, when a lateral load is applied due to turning of the vehicle body or the like, although there are some differences in the contacting surfaces, the first slopes 5 and 6 come into contact with the second slopes 9 and 10 as described above, and By repeating, each slope is worn. Further, with respect to a collision load from the front, the idle wheel shaft 1 moves rearward with respect to the track frame 4 and the spring (not shown) is contracted to alleviate the collision load. Moves with respect to the second slopes 9 and 10. However, since these loads are combined loads, the clearance s becomes large due to wear on the first and second slopes. If the play of the idler wheel 13 in the vertical and horizontal directions becomes large in this way, the cover 20 is removed from the track frame 4, and the multiple adjustment shims 12 are sequentially removed each time the adjustment is made, and the bolts 21 are used. If tightened, it is possible to always maintain the gap that has become large due to wear at an appropriate value.

FIG. 4 shows a second embodiment of the present invention. Parts common to those in FIG. 1 are designated by the same reference numerals as those in FIG. 1 and their explanations are omitted. Only different parts will be explained. FIG. 4 is different in that the first slope 6 and the second slope 10 on the right side of the drawing have the same mountain shape of FIG. 1, whereas the first slope 23 and the second slope 24 on the left side have the valley shape. , The effect is exactly the same as in FIG. Therefore, the left side of the figure may have the same first slope 5 and the second slope 9 as in FIG. 1, and the right side first slope and the second slope may have a valley shape, or the same as the valley shape of the left slope in FIG. The valley shape may be provided on the right side.

FIG. 5 shows another embodiment of the present invention in which only the first and second slopes symmetrical with respect to the center of the idler wheel 13 are shown, and other structures are omitted. The shape of the first and second slopes is not a mountain shape or a valley shape, but is a single slope. That is, (a) is a front view when the first slope 25 and the second slope 26 are high inward, and (b) is the first slope 27 and the second slope 28 are high outward. The effect obtained in this case is similar to that in the case of FIG.

[0013]

[Effect of device]

 As described above, the present invention provides an idler wheel support structure in which the idler wheel shaft of a tracked vehicle is supported by left and right supports and is slid forward and backward in a track frame having a box-shaped cross section. A retaining member having a first inclined surface formed on the side portions of the left and right supports, a second inclined surface facing the upper portion of the first inclined surface, and a bracket for supporting the retaining member inside the track frame. And an adjusting shim between the restraining member and the bracket so as to maintain the first slope and the second slope in an appropriate gap, the first slope and the second slope are The gap due to wear can be adjusted only by the shim without removing the crawler belt, which improves the maintainability and therefore the work efficiency.

[Brief description of drawings]

FIG. 1 is an explanatory view of one embodiment of an idler wheel support mechanism according to the present invention viewed from the front side.

FIG. 2 is a side view of a main part of FIG.

FIG. 3 is a perspective view showing the cover of FIG.

FIG. 4 is a sectional front view of a second embodiment of the idler wheel support mechanism according to the present invention.

5 shows another embodiment in which only the first slope and the second slope of FIG. 1 are arranged, (a) shows the first and second slopes inwardly high, and (b) shows the first and second slopes. It is an explanatory view of the front when is raised to the outside.

FIG. 6 is an explanatory plan view of a conventional idle wheel support mechanism.

7 is an explanatory diagram of a side surface of FIG.

FIG. 8 is an explanatory diagram with a cross section viewed from the rear of FIG.

FIG. 9 is a cross-sectional view of a conventional idle wheel support mechanism in the case where the track frame is not a box type, as viewed from the rear.

[Explanation of symbols]

 1 Idler wheel shaft 2 Support (left) 3 Support (right) 4 Track frame 5, 6, 23, 25, 27 1st slope surface 7, 8 Restraint member 9, 10, 24, 26, 28 2nd Slope 11 Bracket 12 Adjustment shim s Proper clearance

Claims (1)

[Scope of utility model registration request] 1. An idler wheel support structure in which an idler wheel shaft of a tracked vehicle is supported by left and right supports and is slid forward and backward in a track frame having a box-shaped cross section, the left and right supports. A first slope formed on the side of the first slope, a restraining member having a second slope facing the upper portion of the first slope, and a bracket for supporting the restraining member inside the track frame, and An idler wheel support structure comprising an adjusting shim between the restraining member and the bracket to hold the first slope and the second slope in an appropriate gap.