JP2659262C - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a combine provided with a pair of crawler traveling devices on both right and left sides of a machine body, and provided with a pre-cutting device and a threshing device on the machine body. [Related Art] In recent combine harvesters, various types of waste straw processing devices such as a waste straw binding device are often provided at the rear of the body, and the rear of the body tends to be heavy. For this reason, in the wetland, the rear side sinks down and tends to descend. When the vehicle advances in this state, the front side of the machine body may rise due to the propulsion reaction force of the crawler traveling device, and may further tend to fall backward. As described above, when the aircraft descends backward, the sorting in the threshing device is adversely affected. Have been done. [Problems to be Solved by the Invention] In the combine, when one reaping process is completed and a ridge is reached, the forward and backward movement is repeated to change the direction of the machine and the next reaping process is started. Therefore, if the center of gravity is located on the front side of the body as described above, the front side of the body is easily lowered if the propulsion reaction force of the crawler traveling device is applied during reverse travel. As a result, there is a possibility that the reaping section at the front of the body collides with the ground and is damaged. Here, an object of the present invention is to provide a combine that can suppress a forward descent during backward movement while suppressing a backward descent tendency during forward movement. [Means for Solving the Problems] A combine according to the present invention is a combine including a pair of crawler traveling devices on both right and left sides of a machine body and a machine including a pre-cutting device and a threshing device on the machine body, and includes a machine body frame. On the right and left sides of the front end, a pair of front and rear rearward-facing support arms that can swing up and down around a horizontal axis on the front end side is provided, and a track frame that supports the rolling wheel group of the crawler traveling device is provided at the free ends of the two support arms. Pivotally connected across the
Move the track frame forward and downward as the holding arm descends
And the drive wheels of the crawler traveling device are arranged in front of the body frame of the body frame.
To the drive wheels and to the rolling wheel group disposed on the track frame.
The crawlers of the crawler traveling device are wound, and the support arm is automatically lowered when the traveling transmission is operated in the reverse direction. The operation and effect of such a characteristic configuration are as follows. [Operation] If the support arm is directed backward as described above, for example, as shown in FIG. 3, when the front and rear support arms (9) and (10) are lowered, the track frame (13) moves downward. At the same time, the vehicle also moves forward (leftward on the paper). That is, since the ground contact surface of the crawler traveling device moves as a whole in front of the fuselage, the center of gravity of the fuselage moves to the rear side of the fuselage with respect to this contact surface. Therefore, even if the center of gravity of the aircraft is
When the vehicle is moving backward, the center of gravity moves rearward on the ground surface of the crawler traveling device, so that the forward descent during the reverse movement is suppressed. [Effects of the Invention] As described above, even if the center of gravity of the aircraft is positioned on the front side in order to suppress backward descent during forward movement, it is possible to suppress forward descent during reverse movement and improve the traveling performance of the combine. Was completed. Also, when the vehicle is moving backwards, the aircraft is automatically lifted to the ground, improving the rear view from the cockpit, so that the driver may contact the aircraft without recognizing obstacles near the ground when moving backwards. Situations are also reduced. Embodiment An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 5, a mowing part (1) and a traveling mission (2) are mounted on the front of the fuselage, and a threshing device (3) is mounted on the rear of the fuselage. A combine, which is an example of a combine, is supported by (4R) and (4L). Next, the crawler traveling devices (4R) and (4L) will be described. As shown in FIGS. 1 and 2, the mission (2) is connected to a fixed frame (5) on the fuselage side at the front of the fuselage via a pipe frame (22), and the pipe frame (22) Drive wheels at both ends
(6) is provided. A pair of support shafts (7) and (8) are rotatably supported before and after the frame (5), and a support arm is provided on the outer ends of the support shafts (7) and (8) so as to face the body rearward. (9) and (10) are fixed. On the other hand, a plurality of wheels (11) and guide wheels (12) are supported by the track frame (13), and both rear ends of the front and rear support arms (9) and (10) are connected to the track frame (13). ). Operation arms (15) and (16) are fixed to the inner ends of the support shafts (7) and (8), respectively, and extend over the front operation arm (15) and the frame (17) on the body fixed side. A hydraulic cylinder (18) is installed. Further, a link (20) is provided between the operation arms (15) and (16). With the above structure, as shown in FIG. 3, when the hydraulic cylinder (18) is operated to expand and contract to swing the front support arm (9), the rear support arm (10) is also moved by the link (20). Swing up and down at the same time. As shown in FIG. 4, an inclination sensor (14) for detecting the inclination of the body from side to side with respect to the ground is provided, and the detected value is input to the control device (19). This allows
An operation signal is sent from the control device (19) to the control valves (25R) and (25L) for the left and right hydraulic cylinders (18) so that the aircraft becomes horizontal left and right based on the detection value of the tilt sensor (14). The track frames (13) of the left and right crawler traveling devices (4R) and (4L) are independently driven to move up and down. A switching lever (not shown) for a forward / reverse switching device (not shown) in the mission (2) shown in FIG.
23), and a limit switch (24) for detecting that the switching lever (23) is operated to the reverse position (R). Then, switch the switching lever (23) to the reverse position (R
), The left and right hydraulic cylinders (18) are contracted by the control valves (25R) and (25L) to their stroke ends. As a result, the right and left track frames (13) move forward (to the left in the drawing) while descending as shown in FIG. As shown in FIG. 6, the rubber crawlers (21) of the crawler traveling devices (4R) and (4L) are formed with continuous ridges (21a) along their outer edges. As a result, the outer edge of the crawler (21) is bent upward by the tension generated on the ridge (21a) near the front wheel (11a) in FIG. Therefore, the amount of mud blown outward in the vicinity of the wheel (11a) is reduced, and this mud is prevented from adhering to the uncultivated grain culm. Further, as shown in FIG. 7, a rectangular side wall (21b) may be formed on the outer edge of the crawler (21) to stop mud blown outward by the side wall (21b). In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a combine according to the present invention, FIG. 1 is a side view showing an elevating structure of a crawler traveling device, FIG. 2 is a plan view showing an elevating structure of a crawler traveling device, FIG. 3 is a schematic side view showing the ascending and descending state of the track frame in the crawler traveling device, FIG. 4 is a schematic circuit diagram of control, FIG. 5 is an overall side view of the combine, and FIG. 6 is a longitudinal section near the forefront of the crawler. FIG. 7 is a longitudinal sectional front view of a crawler showing another structure of FIG. (4R), (4L) ... crawler traveling device, (9), (10) ... support arm, (11) ... rolling wheel, (
13) ... Track frame.

Claims (1)

Claims: A combine comprising a pair of crawler traveling devices (4R) and (4L) on both left and right sides of a fuselage, and having a cutting pretreatment device and a threshing device on the fuselage, On the left side, a pair of front-rear support arms (9) and (10) that can swing up and down around the horizontal axis on the front end side are provided in a pair, and the crawler traveling devices (4R) and (4L) are rotated.
A track frame (13) supporting a group of wheels (11) is pivotally connected across the free ends of the support arms (9) and (10), and the support arms (9) and (10) are swung down. Tiger
And the drive wheels (6) of the crawler traveling devices (4R) and (4L) are moved forward and downward of the fuselage frame.
And the driving wheels (6) and the rolling wheels (11) disposed on the track frame (13).
When the crawler (21) of the crawler traveling devices (4R) and (4L) is wound around the group and the traveling transmission is operated to the reverse side, the support arms (9) and (10) are automatically lowered. A combine with means to operate.