JPH0735273U - Idler support device for tracked vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] The idler support has a lubrication structure to prevent wear. [Structure] A slide block 4 provided with a idler 3 loosely fitted in a front end opening 2 of a track frame 1 and having slide blocks 4 pivotally supporting the idler 3 fixed to both sides of the front end opening 2 of the track frame 1. The slide block 4 is fitted to the block case 5, the slide block 4 is connected to the yoke 7 that is biased forward by the idler cushion mechanism 6, and the slide surfaces 4a, 4b, 4c of the slide block 4 that come into contact with the slide block case 5 have 4 for the lubricant reservoir 8
A seal member 9 is provided at d.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an idler support device for a tracked vehicle, which is provided with a cushion mechanism for applying tension to a track of the tracked vehicle such as a bulldozer and for reducing an impact from the front.

[0002]

[Prior art]

 As shown in FIG. 5, the undercarriage of a tracked vehicle such as a bulldozer is provided with a sprocket 31 rotatably driven by power from the power line of the vehicle body at the rear part, and is suspended in front of the sprocket 31 by a vehicle body frame (not shown). An idler 33 is freely rotatably fitted in a front end opening of the track frame 32, and is axially movably supported by a forked yoke 35 connected to an idler cushion mechanism 34. A plurality of upper and lower wheels 36, 37 are rotatably arranged on the upper and lower portions of the track frame 32 supporting the idler 33. The sprocket 31, the idler 33, and the upper and lower wheels 36, 37 have a crawler track. 38 is wound.

As shown in FIG. 6, the support structure of the idler 33 is such that both ends of the idler shaft 39 are axially attached to the idler support 40 attached to both pieces 35a, 35a of the bifurcated yoke 35, respectively. In addition, the idler support 40 is held between the upper surface of the track frame 32 and a guide member 41 attached to the track frame 32 and having an inverted L-shaped cross section so as to be movable back and forth. A wear plate 42 is replaceably attached to the upper surface of the track frame 32 on the lower sliding surface of the idler support 40, and a shim 43 for adjusting play due to wear is inserted on the upper sliding surface. There is.

[0004]

[Problems to be solved by the device]

 However, in the structures of FIGS. 5 and 6 described above, since the support portion of the idler 33 slides without lubrication, it wears quickly, cannot support long-term use, and has a drawback that it easily rattles. If this happens, the alignment will be misaligned, and the idler 33, the lower roller 37, and the crawler belt 38 will be unevenly worn, and there is a problem that early replacement is required. Further, as a known technique of a structure for sliding an idler support portion, there are, for example, JP-A-4-314678 and JP-A-4-317877. This is to prevent the sliding surface from prematurely wearing by preventing the intrusion of oil, and there is no change in the structure that slides without lubrication.

In view of this, the present invention provides an idler support device for a tracked vehicle that eliminates wear by using an idler support portion as a lubrication structure and does not require adjustment by a shim to solve the drawbacks of the prior art. It was made for the purpose.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in a first invention of an idler supporting device for a tracked vehicle according to the present invention, an idler is loosely fitted in a front end opening of a track frame, and the idler is rotatably supported. The slide blocks are slidably fitted in the long holes of the slide block case fixed to both sides of the front end opening of the track frame, and the slide blocks are attached to both ends of the yoke urged forward by the idler cushion mechanism. A structure in which a seal member is provided between the slide block and the inner cover surface of the slide block, and a lubricant reservoir is provided on each of the facing surfaces of the slide block and the outer cover and the upper and lower surfaces of the slide block. Is.

In the first invention, a connecting shaft is provided between the rear end of the slide block and both ends of the yoke, and the load of the idler shaft is applied to the recoil spring in the idler cushion mechanism via the connecting shaft. It is configured to transmit.

In the first invention, the cover provided on the outside of the slide block is provided with an oil supply port, and a through hole for communicating from the oil supply port to the lubricant reservoir is provided. Is.

[0009]

[Action]

 According to the above configuration, the slide surface of the slide block integrated with the idler shaft is lubricated, and the seal member prevents dirt and muddy water from entering the slide surface, which reduces wear and thus idler caused by backlash. There is no inclination, and uneven wear around the chassis is prevented. Furthermore, since there is little wear, the shim adjustment that was required in the past is no longer necessary.

[0010]

【Example】

 Hereinafter, the present invention will be described with reference to an embodiment shown in FIGS. An idler supporting device for a tracked vehicle according to the present invention is provided with an idler 3 loosely fitted in a front end opening 2 of a track frame 1, and a slide block 4 rotatably supporting the idler 3 is attached to the track frame. The slide block 4 is slidably fitted in the elongated holes of the slide block case 5 fixed to both sides of the front end opening 2 of the first slide block 4, and the slide block 4 is urged forward by the idler cushion mechanism 6 to both sides of the yoke 7. The sliding surface 4a, 4b, 4c of the slide block 4 which is connected to the front end of the slide block and which contacts the slide block case 5 has a lubricant reservoir 8 on 4d, and a urethane seal 9a and a rubber ring 9b on 4d. The seal member 9 is provided.

A space is provided in the longitudinal direction on both sides of the front end opening 2 of the track frame 1, and the flange portion of the oval slide block case 5 is attached to this space. The slide block case 5 has an oval hole in the longitudinal direction, and covers 10 and 11 are provided inside and outside so as to close the hole. The inner cover 10 is fastened to the slide block case 5 with bolts 12. ing. The outer cover 11 is larger and thicker than the inner cover 10 and overlaps the flange portion of the slide block case 5 so as to be fastened to the front end opening 2 by a bolt 13. At the center of the idler 3 is an integrated idler shaft 14, both ends of which are fitted into holes formed in the slide block 4 as shown in FIGS. It is integrated with 4. The slide block 4 is housed in the elongated hole of the slide block case 5 so that it can slide back and forth. Since the slide block 4 has the idler shaft 14 as a matter of course, the inner cover 10 is provided with the elongated hole 10a that allows the idler shaft 14 to move in the longitudinal direction.

A pair of connecting shafts 16 are provided by screwing between one side of the slide block 4 and the front ends 7a of both pieces of the yoke 7, and the load of the idler shaft 14 is transmitted via the connecting shafts 16 to the idler. It is adapted to be transmitted to a recoil spring 17 in the cushion mechanism 6, and the connecting shaft 16 is supported by a bearing 18 provided near the slide block case 5 of the track frame 1.

The main body of the slide block 4 is a rectangular parallelepiped, and a semicircular flange portion 4 ′ having an appropriate thickness is integrally formed on the front and rear of the idler 3 side. Of the case covers 10, 11 provided on both sides of the slide block 4 in the left-right direction, a plurality of seal members 9 are provided on the slide surface 4d including the flange portion 4'between the inner cover 10 surface. A lubricant reservoir 8 is provided on each of the facing surface 4c and the upper and lower surfaces 4a and 4b of the outer cover 11. Further, the outer cover 11 is provided with a through hole 20 for allowing the lubricant from the oil supply port 19 provided on the outer side to communicate with the reservoir 8. As shown in FIG. 4, the reservoir portion 8 is formed in a groove shape on the upper surface 4a, the lower surface 4b of the slide block 4 and the facing surface 4c of the cover 11 so as to pass the lubricant from the oil supply port 19 through the through hole 20 and the facing surface of the outer cover 11. The reservoir 8 of 4c reaches the reservoirs 8 of the upper and lower surfaces 4a and 4b, so that when the slide block 4 slides in the slide block case 5, the three slide surfaces are lubricated. On the other hand, since the seal member 9 is attached to the groove 21 provided on the facing surface 4d of the inner cover 10, invasion of earth and sand or muddy water from the outside is prevented. In the figure, 22 is a crawler belt, 23 is a lower wheel, and 24 is an O-ring.

Next, the slide amount of the idler shaft 14 is the same as the slide amount of the slide block 4, and as shown in FIG. 1, the length L can be moved back and forth from the center O of the idler shaft 14. There is. The sliding amount is such that the recoil spring 17 absorbs the movement of the idler shaft 14 due to the load from the front, which is transmitted to the idler cushion mechanism 6 through the connecting shaft 16.

[0015]

[Effect of device]

 As described above, according to the present invention, the idler support portion has a sliding structure provided on the slide block, and the slide block is built into the slide block case to prevent dirt and muddy water from entering the slide surface and to prevent abrasion. Is less. Therefore, since the wear is small, the tilt of the idler due to backlash is eliminated, the uneven wear of the undercarriage does not occur, and the adjustment by shims and the replacement of the wear plate are not required as in the past, and the maintainability is improved. Even if the idler support needs to be replaced for a long time, the slide block is built into the slide block case, so only the worn slide block can be replaced, which is economical.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of an idler supporting device for a tracked vehicle according to the present invention.

FIG. 2 is a plan view of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged view of part P of FIG.

FIG. 5 is a partially cutaway side view of a traveling body of a conventional tracked vehicle.

6 is a perspective view showing the idler support device of FIG. 5. FIG.

[Explanation of symbols]

1 ... Track frame, 2 ... Front end opening, 3 ... Idler, 4 ... Slide block, 4a, 4b, 4c, 4d ...
Slide surface, 5 ... Slide block case, 6 ... Idler cushion mechanism, 7 ... Yoke, 7a ... Front end of both pieces, 8
... pool, 9 ... sealing member, 10 ... inner cover, 11 ...
Outer cover, 14 ... Idler shaft, 16 ... Connecting shaft, 17 ...
Recoil spring, 19 ... Grease nipple, 20 ... Through hole.

Claims (3)

[Scope of utility model registration request] 1. A length of a slide block case in which an idler is loosely fitted in a front end opening of a track frame, and slide blocks rotatably supporting the idler are fixed to both sides of the front end opening of the track frame. The slide block is slidably fitted to connect the slide block to both ends of the yoke biased forward by an idler cushion mechanism, and a seal member is provided between the slide block and an inner cover surface of the slide block. An idler supporting device for a tracked vehicle, characterized in that a lubricant reservoir is provided on each of an upper surface and a lower surface of the slide block and an opposite surface of the outer block. 2. A connecting shaft is provided between the rear end of the slide block and both ends of the yoke, and the load of the idler shaft is transmitted to the recoil spring in the idler cushion mechanism via the connecting shaft. The idler support device for a tracked vehicle according to claim 1. 3. The cover according to claim 1, wherein a cover provided outside the slide block is provided with an oil supply port, and a through hole is provided to communicate with the lubricant reservoir from the oil supply port. Idler support device for tracked vehicles.