JPH02286476A - Combined roller guard for rubber and iron crawler - Google Patents

Abstract

PURPOSE:To improve the separation preventing function of a rubber crawler as well as to prevent any penetration of earth and sand by installing each roller-off preventing guard in both front and rear ends on the underside of a track frame after making them come nearer to a lower rolling wheel tread at a crawler side, in a crawler unit for a crawler vehicle. CONSTITUTION:A crawler unit for a crawler vehicle such as a bulldozer or the like is made up of fitting a rubber roller 6 in both upper and lower rolling wheels 4, 5, etc., installed in a sprocket 1, a guide wheel 2 and a track frame 3. In such like crawler unit, each of roller-off preventing guards 7, 8 is installed in both front and rear end on the underside of the track frame 3 after making them comes nearer to each treat 9 for the lower rolling wheel 5 at the side of the crawler 6. Then, each of these roller-off preventing guards 7, 8 is formed so as to apply chamfering at angle of more than 30 degrees to a part that is turned to the more outside than width of the lower rolling wheel tread 9 being opposed to their bottoms 7a, 8a. In addition, at least two pieces among the lower rolling wheels 5 are used as lower rolling wheels with mid flanges, preventing detachment from a crawler belt.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a roller guard used for an undercarriage device of a tracked vehicle such as a bulldozer, and particularly relates to a roller guard that can be used for both rubber and iron crawlers.6 (Prior Art) In the suspension system of a tracked vehicle such as a bulldozer, a guide wheel 21 and a sprocket 22 are used as shown in FIG.
A plurality of upper rolling shafts 24 and lower rolling wheels 25 are provided on the upper and lower sides of the track frame 23 provided between the two, and iron shoes 26 are wrapped around each of these wheels, so that the vehicle is powered by the power transmitted to the sprocket 22. However, in recent years, the rubber crawler 27 shown in Fig. 6, which has an integrated rubber shoe instead of a steel shoe, has been used for the same parts as shown in Fig. 5 to prevent vibration and noise. 6 In order to prevent crawlers from coming off, such undercarriage devices are usually equipped with guards in the case of iron crawlers.

(Problem to be solved by the invention) However, in power excavators that adopted rubber crawlers earlier than bulldozers, if a guard is provided to prevent the crawler from coming off, the iron guard and the rubber crawler will come into contact and be damaged. Therefore, if a guard for a steel crawler is used as it is for a rubber crawler in a bulldozer, it will come into contact with the rubber layer near the tread surface, which is the rolling surface of the lower roller, and damage it. Unlike power excavators, bulldozers perform pushing up work, which requires a large amount of torque, and the reaction of the pushing soil pushes the guide wheel toward the sprocket against the recoil spring, causing the track to loosen. However, there was a problem in that if the guard was not attached, the crawler track would come off the lower roller, guide wheel, sprocket, etc.

In view of this, in order to prevent the above-mentioned problems from occurring, the present invention aims to eliminate the drawbacks of the prior art by providing a roller guard that can be used for both rubber and iron crawlers, in which the guard and the rubber layer do not come into contact with each other. It was done for that purpose.

(Means for Solving the Problems) In order to achieve the above object, claim 1 of the present invention provides a method for winding the sprocket of a tracked vehicle such as a bulldozer, a guide wheel, a plurality of vertical wheels provided on a truck frame, etc. A second aspect of the suspension device comprising a crawler is characterized in that roller detachment prevention guards are provided at the front and rear ends of the lower surface of the track frame in close proximity to the lower roller wheel treads on the crawler side. In the rotating device, the above 1-
Among the multiple F wheels installed on the underside of the rack frame,
At least two of them can be worn as lower rollers with a middle brim! It is characterized by preventing it from coming off.

(For 1 wheel) According to the above structure, in claim 1, the roller detachment prevention guard is provided close to the tread surface of the lower rolling wheel.

In claim 2, since the lower roller wheel is provided with a middle flange, it is prevented from coming off from the crawler track.7 (Embodiment) The present invention will be described below with reference to embodiments shown in FIGS. .

A roller guard for both rubber and iron crawlers according to claim 1 of the present invention is wound around a plurality of vertical wheels 4.5 provided on a tin rocket 1, a guide wheel 2, and an l-rack frame 3 of a tracked vehicle such as a bulldozer. In an undercarriage device consisting of a rubber crawler 6 equipped with a rubber crawler 6, roller detachment prevention guards 7.8 are provided at the front and rear ends of the lower surface of the track frame 3, respectively, close to the tread surface 9 for the lower rolling wheel 5 on the crawler 6 side. 7 FIG. 2 shows the roller detachment prevention guard 7 provided on the lower surface of the track frame 3 on the guide wheel 2 side, and the roller detachment prevention guard 7 provided on both sides of the roller detachment prevention protrusion 10 of the rubber crawler 6. It is attached with the lower surface close to surface 9.9,
At this time, the guide wheel 2 is adapted to move along the upper surface of the prevention projection 10 6 Therefore, even if the rubber crawler 6 comes out of contact with the guide wheel 2 on a slope etc., at least one side of the prevention guard 7 will be moved along the rubber crawler. 6 and will be in contact with the tread surface 9 of No. 6, and will be prevented from coming off from each other.

FIG. 3 shows a roller detachment prevention guard 8 provided on the lower surface of a track frame 3 made of tin 0 butt 1. It is attached with the lower surface close to the tread surface 9.9.However, although it looks like they are touching in the drawing, this is due to the way the cross section is taken, and in reality it is in the same state as in Figure 1. The sprocket 1 is prevented from coming off the rubber crawler 6 7 and the roller detachment prevention guard 8 in this case is installed in order to avoid interference with the lower roller 5 provided close to the tin rocket 1 . The lower surface of the track frame 6 and the t
and the bottom surfaces 7a and 8a of the roller detachment prevention guard 7.8.
The rubber crawler 6 is chamfered at an angle of 30 degrees or more on the part that is outside the width of the opposing lower wheel tread 9.
In this embodiment, these four roller detachment prevention guards 7 and 8, which are arranged to move away from the sides, are all constructed of welded steel plates.

The roller guard for both rubber and iron crawlers according to claim 2 is the same suspension device as in the previous item, in which at least two of the plurality of lower wheels 5 provided on the lower surface of the track frame 3 have a middle flange and a lower wheel. As shown in FIG. 4, flanges 12 and 12 are formed at both ends of the outer periphery of the lower rolling wheel 11 to prevent it from coming off the crawler track.
A middle flange 13 having a smaller diameter and wider width than both flange 12.12 is provided at the center in the longitudinal direction of 2.12. As a result, the outer peripheral surface between the flange 12 and the inner flange 13 has a recess 14.1.
4 7 Then, the lower roller 11 is rotatably attached to a shaft 16 which is fixed to the truck frame 3 via a bearing 15 and is integrated with a fastening member such as a bolt. The externally fitted 6 17 in the figure is a floating seal 6 Claim 2 is attached in this way, so when this lower roller 11 comes into contact with the rubber crawler 6,
The rolling surface 12a, which is the outer peripheral surface of the collar 12.12 of the lower rolling wheel 11, is attached to the tread surfaces 18.18 on both sides of the pair of rolling wheel detachment prevention protrusions 10.10 provided at the center of the rubber crawler 6. At the same time as making contact, the inner flange 13 is attached to the wheel release prevention protrusion 10.1.
Insert it between 0. At this time, the top of the inner tsuba 13 does not come into contact with the bottom between the two rotational axis dislocation prevention protrusions 10 and 10.
Also, the top of the protrusion 10.10 is connected to the recess 14°1 of the lower roller wheel 11.
It looks like a two-dot chain line that maintains a gap that does not touch the bottom of 4.

Therefore, while driving in this condition, you may end up driving on a slope,
Even if the guide wheel is pushed and there is play between the tracks, and the engagement between the lower roller 11 and the rubber crawler 6 is disengaged, and the inner flange 13 is tilted as shown by the dashed line, the inner flange 13 will not move between the rollers of the rubber crawler 6. Prevents coming off/
Since either of the protrusions 10, 10 comes into contact with the protrusions 10, 10, they are prevented from coming off.

A third aspect of the present invention is that in the first aspect, the lower rolling wheel 11 according to the second aspect is mounted at one side close to the roller detachment prevention guard 7 and at the rear thereof, and the other side close to the roller detachment prevention guard 8. It is installed in the front part.

Note that although the above embodiments have been described in the case of a bulldozer applied to a rubber crawler, the present invention can also be applied to a case of an iron crawler.

(Effects of the Invention) As explained above, the present invention provides an undercarriage system comprising a crawler wrapped around a sprocket, a guide wheel, and a plurality of vertical wheels provided on a track frame of a tracked vehicle such as a bulldozer. According to a first aspect of the present invention, a roller detachment prevention guard is provided at the front and rear ends of the lower surface of the track frame, respectively, close to a tread surface for a lower roller on the crawler side. Among the rings,
Since at least two of the lower rollers have inner flanges, the two rubber crawlers are prevented from coming off, and the intrusion of earth and sand is also prevented, which eliminates the problems of the conventional method7.
Claim 3, which is a combination of claim 1 and claim 2, has even better effects6.

[Brief explanation of the drawing]

FIG. 1 is a side view of a rubber crawler suspension device to which the roller detachment prevention guard according to the present invention is applied; FIGS. 2 and 3 show the roller detachment prevention guard for both rubber and iron crawlers of the present invention; Figure (a) is a side view of the guide wheel side, Figure 2 (b) is a sectional view taken along line A-A of (a), Figure 3 (a) is a side view of the sprocket side, and Figure 3 (b) is a side view of the sprocket side. 3(a) as viewed from the Z direction, FIG. 4 is a rear view of the lower roller of the present invention, FIG. 5 is a side view of a conventional iron crawler undercarriage device, and FIG. 6 is a conventional rubber It is a side view of an undercarriage device using a crawler. 1... Sprocket, 2... Guide wheel, 3... Tractor frame, 4... Upper rotation shaft, 5...]; Rolling wheel,
6... Rubber crawler, 7.8... Guard to prevent roller coming off, 9... Tread surface for lower rolling wheel, 10... Protrusion to prevent rolling wheel coming off, 11... Lower rolling wheel with middle flange, 12... Tsuba, 1
2a...Rolling surface, 13...Nakatsuba, 8...Tread surface. Questioner: Komatsu Ltd.

Claims (1)

[Claims] 1) Sprockets and driving wheels of tracked vehicles such as bulldozers,
And in an undercarriage device consisting of a crawler wrapped around a plurality of upper and lower wheels installed on a truck frame, roller detachment prevention guards are installed at the front and rear ends of the lower surface of the truck frame, respectively, close to the tread surface for the lower wheels on the crawler side. A roller guard that can be used for both rubber and iron crawlers. 2) Sprockets and driving wheels of tracked vehicles such as bulldozers,
And in an undercarriage device consisting of a crawler wrapped around a plurality of upper and lower wheels provided on a truck frame, among the plurality of lower wheels provided on the lower surface of the truck frame,
A roller guard that can be used for both rubber and iron crawlers, characterized in that at least two of the lower rollers have inner flanges to prevent them from coming off the crawler track. 3) The roller guard for both rubber and iron crawlers according to claim 1, wherein lower rolling wheels with inner flanges are provided on the lower surface of the track frame in close proximity to roller detachment prevention guards provided at the front and rear ends of the track frame. .