JPH05294268A - Caterpillar type traveling device for construction machinery - Google Patents

Abstract

PURPOSE:To provide a caterpillar type traveling device which can reduce abrasion by increasing the contact area of the bearing (collar) of a driven wheel for the guide part of a side frame and can prevent the deformation of the side frame. CONSTITUTION:In the upper and lower parts of the bearing 8 of a driven wheel 3 on which a belt is laid, a tapered surface 8a inclined to a wedge shape on the inside from the outside and the contiguous vertical plane 8b are formed. In the guide part for a side frame 1, a guide piece 1c which has a triangular section and has a guide sliding surface for receiving the tapered surface 8a of the bearing 8 is installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler type traveling device for construction machines such as hydraulic excavators and bulldozers.

[0002]

2. Description of the Related Art FIG. 8 shows a revolving structure of a hydraulic excavator and an endless track type traveling device. A drive wheel 2 rotated by a hydraulic motor is attached to the rear portion of the side frame 1 that constitutes the track frame, and a driven wheel 3 is attached to the front portion. An endless crawler belt 4 for the driving wheel 2 and the driven wheel 3.
Are hung around. In the center of the track frame,
The revolving structure 5 is rotatably mounted via a revolving wheel.

As shown in FIGS. 9 to 11, the driven wheel 3 is used.
Square bearings (collars) 5 are assembled by the shaft 4 on both outer side surfaces of the shaft center. That is, the shaft 4 is shown in FIG.
The bearing 5 shown in 2 and the shaft holes 5a and 3a of the driven wheel 3 are inserted into the bearing 5 and the pin holes 5b and 4 provided at both ends of the shaft 4, respectively.
The rotation stop pin 6 is inserted in a. The bearing 5 is a guide plate 1 provided in the longitudinal direction (front-back direction) on the side frame 1.
It is held so that it can slide between a and 1b. As shown in FIGS. 9 and 10, both bearings 5 are connected to the bifurcated portion of the connecting member 7. Although not shown, a coil spring that absorbs the impact received by the driven wheel 3 is provided between the spring bearing portion of the connecting member 7 and the spring bearing mounted on the side frame 1.

[0004]

When a hydraulic excavator equipped with such a traveling device travels forward, as shown in FIG.
A relatively high load is applied to the driven wheel 3 as indicated by the arrow F. Further, in the steering operation during forward movement, a load from the side acts on the driven wheels 3 as indicated by an arrow S in FIG. The bearing 4 of the driven wheel 3 slides along the guide plates 1a and 1b by the load described above. This causes the sliding surface of the bearing 4 to wear. Further, in the steering operation, the load from the side is applied only to either of the forked portions of the side frame 1 shown in FIG. 12, and the accident that the side frame 1 bends as shown in the figure occurs. This invention is
In view of the above, an endless track type traveling device capable of increasing the contact area of a bearing with a guide portion of a side frame to reduce its wear and preventing deformation of the side frame is provided. The purpose is to

[0005]

In order to achieve the above object, the present invention supports a bearing of a driven wheel around which a crawler belt is wound by a guide portion provided on a side frame so as to be slidable in the front-rear direction. In an endless track type traveling device for a construction machine, a tapered surface inclined from the outside to the inside in a wedge shape and a vertical surface connected to the tapered surface are formed above and below the bearing, and the guide portion receives the tapered surface of the bearing. It is characterized in that a sliding surface is provided. Further, according to the present invention, in a crawler track type traveling device for a construction machine, wherein a bearing of a driven wheel around which a crawler belt is hung is supported by a guide portion provided on a side frame so as to be slidable in the front-rear direction. A groove is provided in the front-rear direction near the inner end edge of the portion, and the guide portion is provided with a guide sliding surface that receives the upper end flat surface of the bearing and a vertical guide sliding surface that projects into the groove.

[0006]

The sliding surface of the bearing with respect to the guide portion of the side frame is widened, and wear of the contact surface portion between the guide portion and the bearing can be reduced. Furthermore, if a load is applied from the side to the driven wheel,
On the side opposite to the action, the lower guide surface portion of the side frame slides, and on the action side, the upper guide surface portion of the side frame slides.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to FIGS. In these figures, the same or corresponding parts as those in FIGS. 8 to 13 are designated by the same reference numerals.

Above and below the bearing 8, a tapered surface 8a inclined in a wedge shape from the outside to the inside and a vertical surface 8 consequent thereto are formed.
b is formed, and a guide piece 1c having a triangular sectional shape with a guide sliding surface for receiving the tapered surface 8a of the bearing 8 is attached to the guide portion of the side frame 1. The bearing 8 has a shaft hole 8c and a pin hole 8 as in the conventional bearing.
d and are provided.

The bearing 8 slides along the guide surface of the guide piece 1c. For example, when a load S is applied from the side to the driven wheel 3 as shown in FIG. 2, sliding is performed on the guide surface T1 of the lower guide piece 1c on the side opposite to the action, and on the action side, the upper guide is formed. Sliding is performed on the guide surface T2 of the piece 1c. On the other hand, in the conventional case, since the force can be received only by the guide surface on the opposite side to the action, the side frame portion on the opposite side to the action receives the load acting on the driven wheel 3 as it is, so that the side having low strength is applied. The forked portion of the frame opens in the direction in which the load acts. As described above, in the traveling device of the present invention, the load from the driven wheel 3 can be received even on the sliding surface on the working side, so the load on the side frame 1 is halved, and the side frame 1 can be prevented from bending. ..

FIGS. 4 and 5 show a second embodiment of the present invention in which an inclined guide plate 1d for receiving the tapered surface 8a and the vertical surface 8b provided on the bearing 8 is attached to the guide portion of the side frame 1. The operation and effect of this embodiment are similar to those of the first embodiment.

6 and 7, a groove 8e is provided in the longitudinal direction (front-back direction) near the inner end edge of the upper flat surface of the bearing 8.
The guide portion of the side frame 1 has a guide sliding surface for receiving the upper end surface of the bearing 8 and a vertical guide plate 1d fitted in the groove 8e.
3 shows a third embodiment of the present invention in which is provided. The operation and effect of this embodiment are similar to those of the first embodiment.

[0012]

According to the present invention described above, the contact surface between the bearing of the driven wheel and the side frame can be increased to reduce the wear of the contact surface, and the load that the driven wheel receives from the side surface can be reduced. It can be distributed on both sides of the frame, and the side frame can be prevented from bending.

[Brief description of drawings]

1 shows a first embodiment of the present invention B- in FIG.
B sectional side view,

2 is a front view taken along the line AA of FIG. 1, in which the driven wheel is shown without being cut.

FIG. 3 is an exploded front view of each component of the first embodiment shown in FIGS. 1 and 2;

FIG. 4 is a D- in FIG. 5 showing a second embodiment of the present invention.
D sectional side view,

5 is a front view of the CC cross section of FIG. 4, in which the driven wheel is shown without being cut.

FIG. 6 is a view of F- in FIG. 7 showing a third embodiment of the present invention.
F sectional side view,

FIG. 7 is a front view of the EE cross section of FIG. 6, in which the driven wheel is shown without a cross section.

FIG. 8 is a side view showing a swing body and a tracked traveling device of a conventional hydraulic excavator,

FIG. 9 is a cross-sectional plan view showing a driven wheel and a portion in the vicinity thereof of a conventional endless track type traveling device;

10 is a sectional side view of FIG. 9,

11 is a front view of the HH cross section of FIG. 10, in which the driven wheel is shown without being cut.

FIG. 12 is an exploded front view of the parts shown in FIGS. 9 to 11;

13 is a plan view showing the side frame of FIGS. 9 to 11. FIG.

[Explanation of symbols]

 1 side frame 1c guide piece 1d inclined guide plate 1e vertical guide plate 3 driven wheel 4 shaft 4a pin hole 6 non-rotating pin 8 bearing 8a tapered surface 8b vertical surface 8c shaft hole 8d pin hole 8e groove

Claims (2)

[Claims] 1. A crawler track type traveling apparatus for a construction machine, wherein a bearing for a driven wheel around which a crawler belt is hung is supported by a guide portion provided on a side frame so as to be slidable in the front-rear direction.
It is characterized in that a tapered surface inclined from the outer side to the inner side in a wedge shape and a vertical surface consequent thereto are formed on the upper and lower sides of the bearing, and a guide sliding surface for receiving the tapered surface of the bearing is provided in the guide portion. Tracked travel device. 2. A crawler track type traveling device for a construction machine, wherein a bearing of a driven wheel around which a crawler belt is wound is supported by a guide portion provided on a side frame so as to be slidable in the front-rear direction.
A groove is provided in the front-rear direction near the inner end edge of the upper end flat surface of the bearing, and the guide part is provided with a guide sliding surface for receiving the upper end flat surface of the bearing and a vertical guide sliding surface protruding into the groove. A characteristic tracked travel device.