JPH0796869A - Undercarriage for crawler type building machine - Google Patents

Abstract

PURPOSE:To easily increase and decrease the gage of a track frame of a crawler type building machine with a structure which is advantageous in strength. CONSTITUTION:A cylindrical beam 11 is extended through and fixed to one end part of a center frame 10, and is then fitted in a hole 31 in a track frame 30 so as to be slidable widthwise of a vehicle, and the center frame 10 and the track frame 30 are coupled together through the intermediary of a rod while a pin is inserted in a hole 14. The beam 20 is fixed to the other end part of the center frame 10, An abutting surface 21 on the lower surface is made into contact with a seat plate 34 of the track frame 30, and is pushed downward by means of a fastening link 43 of a fastening device 40 by extending a fastening grease cylinder 23. Thus, the beam 20 and the track frame 30 are fastened together. Upon retraction, the pin 13 and a pin 24 are pulled out, and the track frame 30 is moved by a length L, and the pin 13 is inserted in an inner hole 15. Since the fitted is made only for the cylindrical beam, it is possible to enhance the degree of accuracy, thereby it is possible to enhance the strength without rattling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a crawler type construction machine,
In particular, the present invention relates to an undercarriage of a hydraulic excavator, a crawler crane, etc., in which a track gauge can be expanded and contracted.

[0002]

2. Description of the Related Art FIG. 1 is a side view of a hydraulic excavator, and FIG. 2 is a front view thereof. An upper revolving structure 2 having a work machine 3 is mounted on the lower traveling structure 1. Track frames 5 are attached to the left and right of the center frame 4 of the undercarriage 1,
A crawler belt 6 is mounted on the track frame 5. Conventionally, when the width W of the lower traveling structure 1 shown in FIG. 2 is larger than the width S of the upper revolving structure 2 and the width W exceeds the transport limit, the space between the left and right track frames (track gauge) is reduced. A method of keeping the width W within the transportation limit is adopted.

Several proposals have been made as methods for expanding and contracting the interval between the left and right track frames. The first method is the one proposed in the actual Kaihei 3-115157.
Is a perspective view showing the flange 10 of the center frame 100.
1 is fastened to the track frame 103 with bolts 102, and the track frame 1 is always shown as a solid line.
03 at the outermost position, and at the time of contraction, move the track frame 103 to the position shown by the chain double-dashed line so that the bolt 10
Tighten at 2. The pitch of the bolts 102 in the vehicle width direction is such that the bolt holes are aligned even when the track frame 103 is moved. The second method is Shoukai 60-
FIG. 8 is a plan view showing the configuration, as proposed in 160282, and as shown in FIG.
0 has two square or round holes 111, and square or round beams 113 fixed to the left and right track frames 112 are slidably inserted. The center frame 110 and the left and right track frames 112 are connected by hydraulic cylinders 114. When the hydraulic cylinder 114 is extended, the left and right track frames 112
The distance between the hydraulic cylinder 11 and the hydraulic cylinder 11 is increased as in (a).
When 4 is contracted, the beam 113 moves by sliding in the hole 111, and the distance between the track frames 112 is reduced as shown in (b). The third method is proposed in JP-A-3-148388, and FIG. 9 is a front view showing the configuration.
As shown in (a), the center frame 120 and the left and right track frames 121 are connected by links 122 and 123 to form a parallel four-bar link. The center frame 120 and the left and right track frames 121 are connected by a hydraulic cylinder 124. 125 is a track. When the hydraulic cylinder 124 is extended, the space between the left and right track frames 121 is expanded as shown in (a), and when the hydraulic cylinder 124 is contracted, the space between the track frames 12 is reduced as shown in (b).

[0004]

However, the above method has the following problems. (1) In the first method, a large number of bolts must be attached / detached every time the track frame interval is expanded / contracted, which requires a large number of steps. In addition, it takes man-hours to clean mud accumulated on the bolts. (2) In the second method, since the two beams fixed to the left and right track frames are inserted into the two rectangular or round holes provided in the center frame, the dimensional accuracy between the holes and the beams is high. Is difficult to secure, and it is necessary to provide a gap between the hole and the beam. Therefore, if the work is performed for a long time, this backlash may be enlarged, which may cause damage. (3) In the third method, since the parallel four-bar link mechanism is used, if the space between the truck frames is reduced during transportation, the height increases, which may hinder transportation. Also,
Since it is only the link mechanism, it is difficult to secure the strength against the load in the front-rear direction.

The present invention has been able to pay attention to the above-mentioned problems, and the number of man-hours for expanding and contracting the track frame intervals is small,
An object of the present invention is to provide an undercarriage of a crawler-type construction machine that has less play between the center frame and the track frame, is advantageous in strength, and does not hinder transportation.

[0006]

To achieve the above object, in the first invention of the undercarriage of the crawler type construction machine according to the present invention, the track frames provided on both sides of the undercarriage are arranged in the vehicle width direction. In a lower traveling body of a crawler-type construction machine that is movable, the track frame is slidably fitted in and supported by a cylindrical beam fixed to one side of the lower vehicle body in the front-rear direction in the vehicle width direction, and The second aspect of the invention is characterized in that the beam fixed to the other side of the lower vehicle body is slidably brought into contact with and supported by an abutment surface provided on the lower surface of the beam. On the side, a rod for connecting the lower vehicle body and the track frame when the track frame is at the outermost position and the innermost position is provided, and a third aspect of the present invention is provided. Te is the beam side, the track frame when in the outermost position, is characterized by comprising clamping means for fastening the said beam and the track frame.

[0007]

According to the above construction, the track frame is slidably fitted in and supported by the cylindrical beam fixed to one side of the lower body of the crawler type construction machine in the vehicle width direction, and the beam fixed to the other side. The track frame is slidably contacted and supported by the contact surface provided on the lower surface of the vehicle in the vehicle width direction, and when the track frame is on the outermost side and the innermost side on the cylindrical beam side, Since the rod and the fastening means are fastened to fasten the beam and the track frame to each other when the track frame is on the outermost side on the beam side, the rod and the fastening means are opened so that the track frame is cylindrical. The distance between the beam and the beam abutment surface can be slid in the vehicle width direction to increase or decrease the distance. It is possible to fix the parts body and the track frame.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a lower traveling body of a crawler type construction machine according to the present invention will be described below with reference to the drawings. FIG. 3 is a perspective view of the lower traveling body, in which the cylindrical beam 11 is penetrated and fixed to one side of the center frame 10 which is the lower vehicle body. The bracket 12 provided on the end surface of the center frame 10 on the cylindrical beam 11 side has pins 13 on both left and right ends.
Two pin holes 14 and two pin holes 15 are provided near the center. The distance between the pin holes 14 and 15 is L
Is. A hole 31 into which the cylindrical beam 11 is fitted is provided on one side of the left and right track frames 30, and the bracket 32 is fitted into the cylindrical beam 11 so as to be slidable in the vehicle width direction. 12 and 12 are connected by pins 13 and 34 via a rod 33. It is possible to select a high precision for fitting the cylindrical beam 11 and the hole 31. Center frame 10
The beam 20 is fixed to the other side of the. A seat plate 34 is fixed to the other side of the track frame 30 and is brought into contact with contact surfaces 21 provided on the lower surfaces of both ends of the beam 20, and the center frame 10 and the track frame 30 are fastened by a fastening device 40. To do. A bracket 22 provided on the end surface of the center frame 10 on the beam 20 side and a bracket 35 provided on the track frame 30 are connected by pins 24 and 25 via a tightening grease cylinder 23. The tightening grease cylinder 23 can expand and contract by injecting and discharging grease.

FIG. 4 is a side view of the tightening device 40. The bracket 26 provided on the center frame 10 and the bracket 36 provided on the track frame 30 are provided with pins 41.
The lever 42 pivotally attached by means of a pin 44 and a pin 45 are connected to each other via a tightening link 43. 20 is a beam, 34 is a seat plate, and 6 is a crawler track. Figure 6
4 is a perspective view of the tightening link 43, which has pin holes at both ends and an abutting portion 46 at one end.

FIG. 4 shows a track frame 30 similar to FIG.
Is located on the outermost side and shows a normal state of the vehicle. The cylindrical beam 11 side of the track frame 30 is connected to the center frame 10 via the rod 33, and the pin 13 is inserted into the hole 14. Fastening link 4 of fastening device 40
The abutting portion 46 of No. 3 abuts the upper surface of the beam 20 as shown in FIG. In this state, when grease is injected into the tightening grease cylinder 23 connecting the track frame 30 and the center frame 10 and the tightening grease cylinder 23 is extended, the beam 20 is pushed by the abutting portion 46 of the tightening link 43. The lower surfaces of both ends contact the seat plate 34 with a strong force to fix the center frame 10 and the track frame 30. Therefore, the vertical load is applied to the cylindrical beam 11 and the beam 2.
0 bears the load, the rod 33 and the tightening grease cylinder 23 bear the load in the left-right direction, and the cylindrical beam bears the load in the front-back direction.

When the distance between the track frames 30 is reduced during transportation, grease is discharged from the tightening grease cylinder 23 to reduce the tightening force and then the pin 24 is pulled out. Next, pull out the pin 13 and use the working machine of the machine itself, or use the wire or chain block to remove the track frame 30.
Slide to the center frame 10 side. The tightening device 40 is deformed as shown in FIG.
Is separated from the beam 20, and the frictional force between the beam 20 and the track frame 30 is reduced. After moving the track frame 30 by L, the pin 13 of the rod 33 is inserted into the hole 15 to fix the track frame 30 to the center frame 10. When increasing the distance between the track frames 30, the work may be performed in the reverse order.

[0012]

As described above, according to the present invention, the track frame of the crawler type construction machine in which the track frames provided on both sides of the lower vehicle body can be moved in the vehicle width direction is used. It was slidably fitted into and supported by a cylindrical beam fixed to, and abutted on and supported slidably in the vehicle width direction on the lower surface of the beam fixed to the other side of the lower vehicle body.
A rod connecting the lower vehicle body and the track frame is provided on the cylindrical beam side when the track frame is at the outermost position and the innermost position, and a beam is provided on the beam side when the track frame is at the outermost position. Since the tightening means for tightening the track frame with the track frame is provided,
The track frame can be expanded and contracted with a small number of man-hours by attaching and detaching pins, and since the fitting part is a single cylindrical beam, play can be reduced, and it is advantageous in strength against front, back, up, down, left and right loads, and it also hinders transportation. It is possible to obtain the undercarriage of the crawler type construction machine which does not come.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator.

FIG. 2 is a front view of a hydraulic excavator.

FIG. 3 is a perspective view of a lower traveling body of the present invention.

FIG. 4 is a side view of the tightening device of the present invention.

FIG. 5 is a state diagram of the tightening device of the present invention when the track gauge is reduced.

FIG. 6 is a perspective view of a tightening link of the tightening device of the present invention.

FIG. 7 is a perspective view of a first example of a conventional lower traveling body.

FIG. 8 is a plan view showing a configuration of a second example of a conventional lower traveling body.

FIG. 9 is a front view showing the configuration of a third example of the conventional lower traveling body.

[Explanation of symbols]

 10 Center Frame 11 Cylindrical Beam 14, 15 Pin Hole 20 Beam 23 Tightening Grease Cylinder 30 Track Frame 33 Rod 40 Tightening Device 43 Tightening Link

Claims (3)

[Claims] 1. A lower traveling body of a crawler-type construction machine in which truck frames provided on both sides of a lower vehicle body are movable in a vehicle width direction, wherein the truck frames are
An abutment provided on a lower surface of the beam fixed to the other side of the lower vehicle body, slidably fitted in and supported by a cylindrical beam fixed to one side of the lower vehicle body in the front-rear direction. An undercarriage of a crawler type construction machine, which is slidably contacted with and supported by a surface in a vehicle width direction. 2. The rod which connects the lower vehicle body and the track frame when the track frame is at the outermost position and the innermost position is provided on the cylindrical beam side. Undercarriage of the crawler type construction machine described. 3. The crawler according to claim 1, further comprising a fastening means for fastening the beam and the track frame to each other when the track frame is at the outermost position on the beam side. Undercarriage of construction machinery.