JPH0722891U - Recoil device for tracked vehicles - Google Patents

Abstract

(57) [Summary] [Object] To provide a recoil device for a tracked vehicle in which welding and sealing structures are simplified and oil leakage is prevented by preventing damage from external force such as rocks. A recoil device configured separately from the track frame is built in the track frame, and lubricating oil is sealed only in the recoil case.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a recoil device for a tracked vehicle, particularly a tracked vehicle that prevents leakage of lubricating oil around the undercarriage of a bulldozer and simplifies the structure to facilitate manufacture and maintenance.

[0002]

[Prior art]

 FIG. 3 shows an example of a conventional recoil device for a bulldozer, that is, a mechanism for absorbing and absorbing impact force applied to an idler of a traveling body. In the figure, a cylindrical first frame 1 constituting a track frame is also a cylinder. A second frame-shaped frame 2 is slidably inserted, and an idler 4 is rotatably supported on the tip end side of the second frame 2 via a bifurcated yoke 3. In the figure, 5 is an upper wheel, 6 is a lower wheel, and 7 is a crawler belt.

A crawler belt tension adjusting device 8 is provided on the rear end side of the second frame 2, and the device 8 has a piston 10 fitted in a cylinder tube 9 to form a grease chamber 11, while the piston 10 The rod 12 is configured to be inserted in the longitudinal direction so as to face the. By injecting grease from the nipple 13 into the grease chamber 11, the piston 10 is pushed forward, the idler 4 is moved, and the tension of the crawler belt 7 is adjusted.

Further, a recoil device 14 is provided at the front part of the crawler belt tension adjusting device 8. In the device 14, the tubular second frame 2 constitutes a recoil case, and an axial center of the second frame 2 is provided. A rod 12 extending from the crawler belt tension adjusting device 8 is inserted into the rod 12, and a recoil spring 17 is interposed between front and rear spring bearings 15 and 16 fitted to the front and rear ends of the rod 12, respectively. It consists of When an impact force is applied to the idler 4, the idler 4 is moved back and forth to absorb and absorb it.

As described above, notch grooves 18, 18 are formed in the longitudinal direction on the rear end side peripheral wall of the second frame 2 constituting the recoil case so as to face each other in the diametrical direction, and the crawler belt tension adjusting device is also provided. On the peripheral wall side of the cylinder tube 9 of No. 8, a pair of protrusions 19 and 19 which are respectively engaged with and slidable in the cutout grooves 18 and 18 are diametrically opposed to each other, and the cutout groove 18 is formed. Ends of the protrusions 19 and 19 that are inserted through the holders 18 and 18 are fitted to the holding members 20 and 20, and are held by the cut windows 21 and 21 of the peripheral wall of the first frame 1. With each forward and backward movement, the second frame 2 is moved back and forth along the cutout grooves 18, 18 while being held by the first frame 1. Reference numerals 22 and 22 denote covers for preventing the holding members 20 and 20 from slipping out.

As shown in FIG. 4, the first frame 1 is filled with lubricating oil as well as the second frame 2 which is a recoil case in which the recoil spring 17 of the recoil device 14 is built. Corrosion prevention and sliding of the first and second frames 1 and 2 are performed smoothly.

[0007]

[Problems to be solved by the device]

 However, in the conventional recoil device 14, since the first frame 1 is a kind of oil case, and the first frame 1 constitutes the track frame body which is a main member of the undercarriage device, various types are used. In addition to the large number of welded parts, they are directly subjected to external forces such as rocks, which lead to welding fatigue and damage, which leads to cracks and lubricant leakage.

Further, since the first frame 1, which is the main body of the track frame, also serves as the recoil device 14 at the same time, the manufacturing is expensive, especially because the alignment with the second frame 2 and the sealing structure are complicated. Moreover, there is a problem that quality control is difficult.

[0009]

[Means for Solving the Problems]

 The present invention has been made for the purpose of improving the above-mentioned conventional inconveniences. A recoil device, which is configured separately from the track frame, is built in the track frame, and lubricating oil is enclosed only in the recoil case. In this way, the purpose was achieved.

[0010]

[Action]

 Since the recoil device is configured independently of the track frame body, it is possible to separately manufacture the track frame body and the recoil device, and the recoil device is simplified, and welding that causes oil leakage in particular is possible. , The seal area is reduced.

Further, since the lubricating oil is sealed only in the recoil case, oil leakage is reduced from this point as well, and the amount of lubricating oil is also reduced. Also, since the track frame body is covered, there is no damage due to rocks, etc. Therefore, oil leakage due to cracks is prevented.

[0012]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a cross section of a recoil device according to the present invention, and FIG. 2 shows a cross section taken along the line A--A of FIG. 1. In FIG. 1, 31 is a track frame having a substantially inverted U-shaped cross section. Both side pieces 31b and 31b of the frame main body 31a are supporting portions of the lower rolling wheel 6, and the track frame 31 has a hollow structure formed by sheet metal welding by a bottom plate 31c which is horizontally extended between the both side pieces 31a and 31b. The recoil device 32 is built in the hollow portion in the longitudinal direction opened at the front part, the idler 4 is rotatably supported on the front end side via the yoke 3, and the crawler belt tension adjusting device 33 is provided on the rear end side. Is provided.

The recoil device 32 has a spring-cylinder structure. A rod 35 is fitted in the axial center of a recoil case 34 in a tubular shape, and front and rear parts of the rod 35 are provided with belt receivers 36 and 37, respectively. They are fitted together, and a recoil spring 38 is interposed between them.

Further, the crawler belt tension adjusting device 33 is provided in the rear extension portion 34a of the recoil case 34, and as shown in the figure, the piston 40 is inserted into the cylinder tube 39 fitted in the case extension portion 34a. It is installed in the cylinder tube 39 so that the grease chamber 41 is formed, and the rear end of the rod 35 fitted into the axis of the recoil device 32 is brought into contact with the front portion of the piston 40. Has been inserted. When adjusting the crawler belt tension, a part of the grease chamber 41 is formed in the rear portion of the cylinder tube 39, and the rear surface of the grease chamber is attached to the boss portion 43 held by the inner wall 42 of the track frame 31 to remove the grease. By injecting, the rod 35 is pushed forward through the piston 40, and then the rear spring bearing 37 is pushed by the step portion 45 of the rod 35, whereby the recoil case 34 and the idler 4 are moved forward. The crawler belt tension adjusting device 33 and the adjusting procedure are the same as the conventional ones.

Further, as a rear end side holding structure of the recoil device 32, as shown in FIG. 2, an annular member 47 having protrusions 46, 46 formed on the left and right sides of the peripheral wall is slid on the rear end extending portion 34a of the recoil case 34. The slits 48 and 48 are opened so as to face the left and right protrusions 46 and 46 on the other side of the track frame 31 side, and the recesses 49 and 49 are formed inside the slits 48 and 48, respectively. The holding members 50, 50 provided are fitted, and the left and right protrusions 46, 46 of the annular member 47 are engaged with the recesses 49, 49 of the left and right holding members 50, 50, respectively. Is held on the track frame 31 so as to be slidable back and forth. In addition, reference numerals 51 and 51 in the drawing denote covers for preventing the holding members 50 and 50 from slipping out.

To lubricate the recoil device 32, the recoil case 34 is filled with lubricating oil up to the illustrated oil level (L) in order to prevent the recoil spring 38 from rusting. It is supplied to the hollow portion 53 of the extending portion 34a of the recoil case 34 through the small hole 52 formed in the rear spring seat 37, and the sliding surface 54 between the inner wall surface of the extending portion 34a and the cylinder tube 39. To lubricate. Reference numerals 55 and 56 are a seal member and a bush attached to the sliding surface 54.

Further, in order to supply the lubricating oil in the recoil case 34 to the sliding surface 57 with the annular member 37 circumferentially attached to the outer wall of the tubular portion 34 a of the recoil case 34, the recoil case 34 and the annular case A refueling hose 58 is connected between the members 47 so that the longitudinal movement of the recoil device 32 acts as a pump to supply it to the sliding surface 57. Reference numeral 59 is a seal member and 60 is a bush.

Next, the recoil device 32 and the lubricating action will be described. When an impact force is applied to the idler 4 when the bulldozer travels in a vertical work area, the recoil spring 38 expands and contracts to move the idler 4 back and forth. The recoil case 34 is held on the track frame 31 by the annular member 47, and the outer wall surface is the sliding surface 57 of the annular member 47 and the inner wall surface is the cylinder tube 39. While being guided by the respective sliding surfaces 54, the movement is repeated in the front-rear direction as shown by the shadow line. Then, each time the recoil device 32 is operated back and forth, the lubricating oil enclosed in the recoil case 34 is supplied to the sliding surfaces 54 and 57 to smoothly slide, and wear is minimized. It will be.

[0019]

[Effect of device]

 As described above, according to the present invention, the recoil device is configured as a unit set independent of the track frame, and the track frame and the recoil device can be separately manufactured because they are built in the track frame. The structure and seal structure are simplified, and it is easy to control the quality of processing and assembling accuracy, which reduces the manufacturing cost and facilitates maintenance management.

Further, since the lubricating oil is enclosed only in the recoil case, oil leakage is reduced, and since the track frame is covered, external force such as rocks does not act directly, so oil leakage due to damage In addition to preventing the above, the amount of lubricating oil can be reduced, and in this embodiment, it is possible to achieve a significant reduction of about 1/4 as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a recoil device according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing an example of a conventional recoil device.

FIG. 4 is a sectional view taken along the line BB of FIG.

[Explanation of symbols]

31 ... Track frame, 32 ... Recoil device, 33 ...
Crawler belt tension adjusting device, 34 ... Recoil case, 34a ... Recoil case extension part, 35 ... Rod, 38 ... Recoil spring, 39 ... Cylinder tube, 46 ... Projection part, 47 ... Annular member, 48 ... Cut window, 50 ... Holding member, 54, 57 ... Impulsive surface, 58 ... Refueling hose.

Claims (1)

[Scope of utility model registration request] 1. A tubular recoil case in a longitudinal hollow portion formed in a track frame, a rod in the recoil case fitted in an axial center portion, and springs fitted in front and rear portions of the rod, respectively. A seat and a closed recoil device composed of a recoil spring interposed between the front and rear spring seats,
An idler is rotatably supported at a front end of the recoil device via a bifurcated yoke and is movable back and forth, and an annular member is circumferentially attached to the outer periphery of the recoil case at a rear end of the recoil device to slide the recoil device on a track frame. While holding it movably, the inner circumference is slidably fitted into the cylinder tube of the track tension adjusting device, and the lubricating oil enclosed in the recoil case is supplied to the hollow part with the cylinder tube through the communication hole. The inner peripheral sliding surface with the tube is infiltrated, and the lubricating oil in the recoil case is supplied to the outer peripheral sliding surface with the annular member via an oil supply hose for lubrication. A recoil device for tracked vehicles.