JPH0229024Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a mud clogging prevention device for a track-type traveling body such as a hydraulic excavator or a crane.

[Conventional technology]

Next, an example of a conventional hydraulic excavator will be described with reference to FIGS. 6 and 7.

As shown in FIG. 6, a driving sprocket wheel 2 rotated by a hydraulic motor is supported at the rear end of the side frame 1 constituting the traveling body, and a driven sprocket wheel 3 is provided at the front end. ing. An endless track link 4 is wound around both sprocket wheels 2 and 3. A revolving body 5 is rotatably mounted on the upper part of the traveling body, and a working machine (front attachment) is attached to the front part of the revolving body 5.

As shown in FIG. 7, the driven sprocket wheel 3 is supported by a yoke 7, and the yoke 7 is connected to an adjustment cylinder 8. The adjustment cylinder 8 is for adjusting the tension of the track link 4, and is installed on the side frame 1. The lower leg portion of the track link 4 is received by a lower roller 9, and the upper portion thereof is received by an upper roller 10. The tension of the track link 4 is adjusted by moving the driven sprocket wheel 3 in the front-rear direction (in the direction of arrows F and B).

[Problem that the invention attempts to solve]

A space is provided between the side frame 1 and the driven sprocket wheel 3 so that the driven sprocket 3 does not hit the side frame 1 when it moves rearward (in the direction of arrow B). For this reason,
Earth and sand adhering to the track link 4, shoe, etc. may fall during driving, or may be dragged in during excavation, resulting in the space 11 being clogged with earth and sand. In this case, it becomes difficult for the driven sprocket wheel 3 to move rearward (in the direction of arrow B), and the track link 4 may be constantly stretched. With track link 4 always tensioned, move backward (arrow B
If the vehicle cannot be retracted in the direction of 1), abnormal tension will be applied to the track link 4 while the vehicle is running, making steering operation difficult or causing failure of the travel drive device or the like.

The purpose of this invention is to easily prevent the above-mentioned clogging of earth and sand.

[Means for solving problems]

In order to achieve the above object, this invention supports a driving sprocket wheel at the rear end of the side frame, a driven sprocket foil at the front end, and an endless track link that extends around both sprocket wheels. In the tracked running body of construction machinery, one end of the cover made of a flexible material is fixed to the upper plate of the front end of the side frame,
It is characterized in that the other end is brought into close contact with the upper outer periphery of the driven sprocket wheel so that it can move up and down in accordance with the back and forth movement of the driven sprocket wheel.

[Effect]

The plate-like body prevents dirt from entering between the driven sprocket foil and the side frame.

〔Example〕

First, an embodiment of this invention shown in FIGS. 1 and 2 will be described. In this figure, the same reference numerals as in FIG. 7 represent the same parts.

A cover 12 made of a flexible material such as rubber is provided on the upper plate 1a at the front end of the side frame 1.
One end (rear end) of the cover 12 is fixed, and the other end (front end) of the cover 12 is fixed in the vertical direction (arrow U,
The driven sprocket wheel 3 is brought into close contact with the upper outer periphery of the driven sprocket wheel 3 so that it can move in the direction D). With respect to the movement of the driven sprocket wheel 3 in the front-rear direction (in the direction of arrows F and B), the front end of the cover 12 moves downward and downward.
It can move upward (in the direction of arrows D and U).

Figures 3 to 5 show another embodiment of this invention in which angle-shaped retaining plates are attached to both side edges of the cover.

A screw seat 13 having a plurality of screw holes 13a is fixed to the upper plate 1a at the front end of the side frame 1.
One end (rear end) of a rubber cover 14 provided with a is fixed via a presser plate 15. That is, the cover 14 and the presser plate 15 are tightened by bolts 17 with spring seats 16 interposed therebetween.
The bolt 17 is inserted into the hole 15a of the holding plate 15 and the cover 14.
is screwed into the screw hole 13a of the screw seat 13 through the hole 14a. A slit 14 is provided in the middle of the other end (front end) of the cover 14 so that the cover 14 fits into the central convex part of the driven sprocket wheel 3.
b is provided.

Angled retaining plates 22 are attached to both side edges of the cover 14 with bolts 18, spring seats 19, flat seats 20, and nuts 21. The bolt 18 is connected to the spring seat 19, the hole 22a of the holding plate 22, and the cover 14.
It passes through holes 14c provided on both side edges of the flat seat 20, and a nut 21 is fitted into the lower end thereof. The flat seat 20 is for preventing the nut 21 from being too deeply wedged into the cover 14. The holding plate 22 prevents earth and sand from entering from the side and also serves as a weight. That is, the adhesion of the cover 14 to the driven sprocket wheel 3 is improved.

Driven sprocket wheel 3 and side frame 1
The cover 14 and the holding plate 22 prevent earth and sand from entering between the two.

[Effect of idea]

According to this invention explained above, it is possible to easily prevent dirt from entering between the side frame and the driven sprocket foil, and therefore, it is possible to easily prevent dirt from entering between the side frame and the driven sprocket foil, and therefore, abnormal tension is applied to the truck link due to mud clogging. It is possible to prevent dirt and damage to the adjustment cylinder due to mud clogging. Also,
It is also possible to prevent abnormal wear of the track link and travel drive device and overload of the travel motor due to abnormal tension in the track link. Furthermore, it is possible to improve the operating rate by eliminating the trouble that conventionally required operators to remove clogged mud during daily inspections. Moreover, parts of the mud-clogging prevention device can be easily replaced.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of this invention, Fig. 2 is a sectional side view of Fig. 1, and Figs. 3 to 5 show other embodiments of this invention, and Fig. 3 is a plan view. 4 is a sectional side view, and FIG. 5 is an exploded enlarged perspective view. FIG. 6 is a side view showing an example of a conventional hydraulic excavator, and FIG. 7 is a cross-sectional side view showing the vicinity of the driven sprocket wheel in FIG. 6.

Claims (1)

[Scope of utility model registration request] In a track-type running body for construction machinery, the side frame has a driving sprocket wheel supported at the rear end of the side frame, a driven sprocket wheel supported at the front end, and an endless track link wrapped around both sprocket wheels. One end of the cover made of a flexible material is fixed to the upper plate of the front end of the driven sprocket, and the other end is attached to the driven sprocket so that it can move up and down in accordance with the back and forth movement of the driven sprocket wheel. A mud clogging prevention device characterized by being closely attached to the upper outer periphery of the foil.