JPH0651083U - Bulldozer mainframe structure - Google Patents

Abstract

(57) [Summary] [Purpose] The main frame structure of a bulldozer that enables thin plate construction. [Structure] Both ends of a pipe 2 having a length straddling a desired thickness are fixedly mounted on the left and right track frames 1, and an earthworking machine mounting boss 3 is integrally fixed to the inner periphery thereof to mount the earthworking machine. A frame main body 4 composed of a bottom 4a of the thin plate and both side walls 4b, 4b is provided so as to be swingable at a central portion inside the boss 3, and a rear end of the frame main body is steered. Connected to the horizontal axis case 5 that houses the device. [Effect] The pipe receives all the load received from the track frame and the load received from the earthworking machine, and the frame body does not receive these loads. Therefore, the frame body may be made of a thin plate. Therefore, the weight can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a main frame structure of a bulldozer, and particularly to a main frame structure for reducing weight.

[0002]

[Prior art]

 As shown in FIG. 4, the main frame 21 of the bulldozer that has been conventionally used has a horizontal shaft case 22 having a steering device incorporated therein connected to the rear part thereof. Although they are disassembled, when they are assembled, the equalizer bar 23 is connected to the front by the A line. Further, brackets 24 are fixed to both side surfaces by fastening means such as bolts so that the brackets 24 are connected by the B line. The upper part of the bracket 24 is attached so as to be connected by the C line via a lift cylinder 27 provided between the upper part of the pair of brackets 26 on the U-frame 25 that supports the earthworking machine (not shown). The rear end of the U-frame 25 is attached to the lower end of the bracket 24 by a D line. Therefore, the main frame 21 shares the load from the earthworking machine including the blade and the U frame 25 (not shown) and the load from the track frame 28. Therefore, the main frame 21 is loaded with these loads. Had to be built to withstand. Therefore, inevitably, a thick plate was used, and if it was not a thick plate, a thin box was used.

[0003]

[Problems to be solved by the device]

 Therefore: The weight of the main frame becomes heavy. : The structure is complicated to support the load from earthmoving machines and suspensions. : There was a problem that the cost increased due to factors such as.

In view of this, the present invention provides a mainframe structure of a bulldozer that does not receive a load from an earthmoving machine or an underbody on the mainframe, and thus enables a thin plate configuration. The purpose was to eliminate the drawbacks of the prior art.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is to fix both ends of a pipe having a desired thickness over the left and right track frames, and to fix the earthworking machine mounting bosses on the inner periphery of the pipe. Then, a frame main body composed of the bottom of the thin plate and both side walls is oscillatably provided at the center inside the boss for mounting the earthworking machine, and the rear end of the frame main body is operated. It is characterized in that it is connected to a horizontal axis case that houses the orientation device.

[0006]

[Action]

 According to the above configuration, since the underbody load and earthmoving machine load are all received by the pipe integrated with the track frame, the frame body, which is the main body of the main frame, does not receive a load from the outside. can do.

[0007]

【Example】

 1 is a plan view of an embodiment of a main frame structure of a bulldozer according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a detailed view of a portion P of FIG.

Hereinafter, the present invention will be described with reference to the embodiments shown in FIGS. According to the present invention, both ends of a pipe 2 having a length straddling a desired thickness are fixedly mounted on the left and right track frames 1, and a boss 3 for mounting an earthworking machine is integrally fixed to the inner circumference of the pipe 2 to fix the earthworking machine. A frame body 4 composed of a thin plate bottom portion 4a and both side walls 4b and 4b penetrates through a central portion inside the mounting boss 3 so as to be swingable, and a rear end of the frame body is provided. Is connected to a horizontal axis case 5 which houses a steering device.

The pipe 2 has an appropriate thickness, and plates 6 are fixed to both ends by means such as welding. Has become. A boss 3 having a pin hole 3a is externally fitted to the outer periphery of the pipe 2 inside the track frame 1 for attaching the rear end of the U frame as shown in FIG. It is one. The frame main body 4 is held at a constant distance by a pair of ribs 8 provided between the side walls 4b, 4b at a position farther from the outer circumference of the pipe 2. The end portion of the boss 3 on the frame body 4 side is formed as a one-step smaller diameter portion 3b. A seal 9 is provided between the cover 9 and a contact plate 4d having substantially the same diameter, and the pipe 2 supports the frame body 4 swingably at this seal 9 portion. The frame body 4 is integrally fixed to the horizontal axis case 5 at the rear portion by means such as welding, and the horizontal axis case 5 penetrates the horizontal axis case 5 with respect to the track frame 1. It is fixed by the pipe member 10. A bonnet 11 is attached to the front portion of the frame body 4 as shown by a two-dot chain line in FIGS.

Next, the operation will be described. As described above, the main frame composed of the pipe 2 including the boss 3 and the frame body 4 transmits the load to the pipe 2 portion when the load from the underbody is received, and the load from the earthworking machine. Even when receiving the load, the load is transmitted from the boss portion 3 to the pipe 2, but since the frame body 4 is not structured to transmit the load to the pipe 2, the frame body 4 is The strength to withstand these loads becomes unnecessary. Therefore, only the pipe 2 needs to have the strength to withstand these loads.

[0011]

[Effect of device]

 As described above, according to the present invention, both ends of a pipe having a length that straddles a desired thickness are fixedly mounted on the left and right track frames, and the earthworking machine mounting boss is integrally fixed to the inner circumference of the pipe. A frame main body composed of a bottom portion and both side walls of the thin plate is pierced through a central portion inside the earthworking machine mounting boss so as to be swingable, and a rear end of the frame body is steered. Since it is connected to the horizontal axis case that houses the equipment, the pipe receives all the load received from the truck frame and the load received from the earthworking machine, and the frame body does not receive these loads. Therefore, the frame body can be constructed by a thin plate, and the weight can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a main frame structure of a bulldozer according to the present invention.

FIG. 2 is an explanatory diagram showing a side surface of FIG.

FIG. 3 is an explanatory diagram showing details of a P portion in FIG.

FIG. 4 is a perspective view showing a conventional main frame structure.

[Explanation of symbols]

 1 Track Frame 2 Pipe 3 Earth Machine Installation Boss 4 Frame Main Body 4a Bottom 4b Sidewall 5 Horizontal Axis Case

Claims (1)

[Scope of utility model registration request] 1. A pipe having a length that straddles a desired thickness is fixedly mounted on the left and right track frames, and earthworking machine mounting bosses are integrally fixed to the inner periphery of the pipe to mount the earthworking machine. A frame main body composed of a bottom portion and both side walls of the thin plate is oscillatably provided at a central portion of the inner side of the operation boss, and a rear end of the frame main body is provided with a lateral portion for incorporating a steering device therein. Main frame structure of a bulldozer characterized by being connected to a shaft case.