JPH0535548U - Agricultural vehicle turning device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The turning radius is significantly smaller than that of the conventional side clutch / brake type and the turning mechanism using a differential mechanism. (EN) A swivel device for a farm vehicle capable of making a small turn satisfactorily without damaging ridges or damaging crops when traveling. [Structure] Each of the left traveling section and the right traveling section disposed below the vehicle body is provided so as to be rotatable relative to the vehicle body about the vertical axis centered at the center of each traveling section, and the vehicle travels around a turning circle. With one part fixed or substantially fixed, the other running part and the vehicle body are turned around the longitudinal axis of the turning girder to turn 180 degrees, and after the turning, the rotation direction of the turning part of the turning girder. Is switched to match the rotation directions of the left and right traveling parts.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a turning device for agricultural work vehicles such as rice transplanters and management work machines.

[0002]

[Prior Art]

 In a conventional agricultural work vehicle, a pair of left and right side clutch brakes should be incorporated into the drive transmission system that drives the left and right traveling parts, or a differential mechanism should be incorporated to provide one-sided braking of the traveling gear. Therefore, the means for turning by making the right and left running parts differential is adopted.

[0003]

[Problems to be solved by the device]

 With the conventional turning means, since the left and right running parts move in an arc shape with the turning center outside the fuselage as a fulcrum, when running through ridges or crop lines, the running part comes off from the ridges or the like. If you start turning before you start turning, the running part that moves into an arc, especially the running part inside the turning, will damage the ridges and damage the crops, so the running part will come out of the ridges. You must make a turn afterwards. Therefore, there was a problem that a large headland (unutilized part) was required at the end of the field, and the utilization of the field was significantly reduced. The present invention has been implemented in view of the above problems, and has been studied to make it possible to make a small turn in a favorable manner without damaging ridges or crops even in a field where the headland is made small and the degree of utilization is high. The purpose is to obtain a car turning device.

[0004]

[Means for Solving the Problems]

 That is, in the turning apparatus for an agricultural work vehicle according to the present invention, each of the left traveling portion (2) and the right traveling portion (3) arranged below the vehicle body (1) is placed at the center of each traveling portion (2) (3). It is equipped so that it can rotate relative to the vehicle body (1) around the vertical axis (4) (5) centered on the upper part, and the running part (2) or (3) of the swinging wheel is fixed or substantially fixed. Above, the other running part (3) or (2) and the vehicle body (1) are turned around the vertical axis (4) or (5) of the turning girder to turn 180 degrees and then turn. It is characterized in that the rotation direction of the running section (2) or (3) of the kawa is switched so that the rotation directions of both running sections (2) and (3) coincide with each other.

[0005]

[Effect of the device]

 The turning device according to the present invention is configured as described above, and the running part of the turning girdle is maintained in the posture of the forward path, and the other running part and the vehicle body are arranged along the longitudinal axis of the turning girder. Turning is performed by turning 180 degrees around the center, so the turning half-diameter is significantly smaller than that of the conventional side clutch / blur type or turning means using a differential mechanism, and turning in a narrow space is possible. It is convenient. The traveling part of the turning path does not move in an arc shape, and the turning is performed at a position that is maintained in the posture almost on the outward path, so when traveling between ridges and crop lines, the end of the field Even if the direction of the return path is changed when the running part does not completely pass through the ridges or the crop lines, the running part of the turning circle may break the ridges or damage the crops. There is no. Therefore, even if the headland portion at the end of the field is reduced, the headland can be turned without hindrance, which is advantageous because the field utilization rate is increased. There are advantages such as.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. 1 is a schematic plan view of an agricultural work vehicle according to the present invention, FIG. 2 is a schematic rear view of the agricultural work vehicle, and FIG. 3 is a transmission diagram showing an example of a mission of the agricultural work vehicle according to the present invention, and FIGS. 6 is an operation explanatory view showing a left turning state of the agricultural work vehicle according to the present invention.

In FIG. 1 and FIG. 2, each of a pair of left and right traveling parts (2) and (3) arranged below the vehicle body (1) includes a drive case (2a) (3a) and an axis thereof. It is composed of wheels supported by a rack or grounded rolling elements (2b) and (3b) such as crawlers. The input shaft (4) of the left drive case (2a) is provided as a vertical axis located in the front and rear of the left traveling portion (2) and in the center in the width direction, and the right drive case (3a) is also provided. The input shaft (5) is also set as a vertical axis located in the front-rear and widthwise central parts of the right traveling part (3).

Each of the input shafts (4) and (5) penetrates upwardly through support parts (1a) (1b) formed at intermediate positions in the front-rear direction of the left side part and the right side part of the vehicle body (1). The left running part (2) and the right running part (3) can be rotated relative to the vehicle body (1) around the input shafts (4) and (5). There is. Then, the vehicle body (1) and the left drive case (2a) and the vehicle body (1) and the right drive case (3a) are locked so as to prevent the relative rotation. A lock mechanism (6) (7) that can be engaged is provided, and when one of the lock mechanisms (6) (7) is released, the input shaft (4) or ( The vehicle body (1) and the other traveling portion (3) or (2) can be integrally rotated about the center (5).

Passive parts (8) and (9) are provided at the upper ends of the respective input shafts (4) and (5), and the respective passive parts (8) and (9) are connected to the left and right transmission mechanisms (10) and (11). It is interlockingly connected to the left and right output shafts (13) and (14) of the mission (12) via. The left and right transmission mechanisms (10) and (11) are provided with a structure that does not prevent the vehicle body and one traveling portion from rotationally moving around the input shaft in the other traveling portion. The details of the internal structure of the mission (12) will be described later.

On the other hand, the lower part of each input shaft (4) (5), that is, the protrusion into the left drive case (2a) and the protrusion into the right drive case (3a), respectively, is positive. The reverse rotation mechanisms (15) and (16) are incorporated, and the final transmission mechanism (in the drive cases (2a) and (2b) from the output shafts (17) and (18) of these forward and reverse rotation mechanisms (15) and (16) ( 19) The left and right front and rear wheels, which are the left and right ground rolling elements (2b) and (3b), and the right and left front and rear wheels are driven by the power transmitted via (20). (15) and (16) are configured so that the rotation directions can be independently switched.

The rotation direction of the forward / reverse rotation mechanism (15) (16) is switched by the control device (21) at a necessary time in connection with the engagement / disengagement operation of the lock mechanism (6) (7). It's done automatically. For example, when the operating portion (22) of the control device (21) is operated to turn the aircraft to the left, the left drive case (2a) and the vehicle body (1) are instructed by the controller (23). The lock of the left lock mechanism (6) that has locked the vehicle is released, and the vehicle body (1) and the right ground rolling element (3b) are driven by the driving force of the right ground rolling element (3b). The left lock mechanism (6) returns to the locked state again after turning 180 degrees around (4) and turning 180 degrees. The signal from the feedback circuit (24) is input to the controller (23), and the signal generated by the controller based on it causes the left / right forward / reverse rotation mechanism (15) to switch to the reverse rotation state and the left / right grounding rotation. This is so configured that the rotating directions of the moving bodies (2b) and (3b) coincide with each other. In FIG. 2, (25) is an actuator for engaging and disengaging the left lock mechanism, (26) is an actuator for switching the left and right forward / reverse rotation mechanism, and (27) is a right feedback circuit. , (28) is an actuator for engaging and disengaging the right lock mechanism, and (29) is an actuator for switching and operating the right and reverse mechanism on the right side.

A mission (12) in which the left and right transmission mechanisms (10) and (11) are interlockingly connected to the left and right output shafts (13) and (14) is configured as shown in FIG. .. In FIG. 3, reference numeral (30) denotes an engine mounted on a vehicle body, an output portion of which is connected to a continuously variable transmission portion (31), which is orthogonal to an output shaft (32) of the continuously variable transmission portion (31). A forward / reverse switching gear portion (35) is provided on the intermediate shafts (33) (34) in the direction. Then, the power from the forward / reverse switching gear part (35) is transmitted to the passive gear (37) provided on the side clutch shaft (36), and further, the left and right side clutch gears (engaged with and disengaged from the passive gear (37). 38) and (39) through the left and right final gears (40) and (41) to the left and right rear shafts (42) and (43), and the left and right output shafts via the bevel gear meshing parts (44) and (45). It is transmitted to (13) and (14).

Fixed brakes (46) and (47) are provided on the left and right sides of the side clutch shaft (36), and the side clutch gears (38) and (39) disengaged from the passive gear (37) are installed. Further, when it is moved further outward, it engages with the fixed brakes (46) (47) and the transmission system thereafter is controlled, and the side clutch gears (38) (39) Although not shown in the drawing, the steering operation device provided in the control section (48) of the vehicle body (1) allows sliding movement for each of left and right.

[0014]

[Action]

 Next, the operation of the agricultural work vehicle configured as described above will be described. Normally, the vehicle body (1) and the left and right running parts (2) and (3) are kept in the state shown in FIG. 2, and the left drive case (2a) and the right drive case (3a) are ) Are both integrally locked to the vehicle body (1) by the lock mechanisms (6) and (7). In this state, when the power of the engine (30) is input to the mission (12), the power set to the appropriate speed by the continuously variable transmission (31) is transmitted to the forward / reverse switching gear (35). .. Then, if the forward / reverse switching gear unit (35) is in the forward traveling state, the aircraft will travel forward, and if it is in the backward traveling state, it will travel backward.

In the above running state, steering for correcting the traveling direction can be performed by operating the steering operation device provided in the control section (48). If the left side clutch gear (38) is disengaged from the passive gear (37) and then locked to the fixed brake (46) on the left side, rotation of the left running part (2) stops. , The aircraft turns left in a skid steered state only by the operation of the right traveling part (3), and when correcting the direction to the right, the right side clutch gear (39) is moved from the passive gear (37). If it is disengaged and then locked to the fixed brake (47) on the right side, the aircraft will turn to the right in a skid steer like the case on the left side.

Then, when the end of the field is reached, the machine body is turned 180 degrees leftward or rightward and turned toward the return path. This turning operation is performed by the operation unit () of the control device (21). 22) is also operated. This will be described for the case of turning left. When a command for turning left is given to the controller (23) by the operation unit (22), the left drive case is generated by a signal issued by the controller (23). The left lock mechanism (6) that locks the vehicle (2a) and the vehicle body (1) is released, and the vehicle body (1) and the right grounding rolling element (3b) are integrated and the left input It becomes possible to rotate around the shaft (4). Then, by operating the steering operation device provided in the control section (48), the left side clutch gear (38) is disengaged from the passive gear (37), and the left side fixed brake (46) is released. When locked, the left running part (2) stops rotating and the left running part (2) is kept in its normal position, while the vehicle body (1) and the right running part (3) move to the right running part ( The driving force of 3) causes the left input shaft (4) to rotate leftward about the input shaft (4), and as shown in FIGS. 4 to 6, through A1 → A2 → A3 → A4. It will be turned 180 degrees.

In this way, when the state of A4 shown by the thick solid line in FIG. 4 is reached, the left lock mechanism (6) returns to the locked state by the command of the controller (23), and the returned state is detected. In response to the command from the feedback circuit (24), the controller (23) issues a signal for switching the left-right forward / reverse rotation mechanism (15) in the direction opposite to the conventional rotation direction. The rotation directions of the ground rolling elements (2b) and (3b) are the same, so that the backward traveling can be performed without any trouble. Also, when turning the aircraft to the right, by operating the operation unit (22) of the control device (21) to give a right turning command to the controller (23), It is possible to turn to the right in the same operating mode.

In the illustrated mission (12), a single passive gear (37) is provided separately for the left and right, and the left and right passive gears and the forward / reverse switching gear part (35) are left and right. It is also possible to incorporate a separate creep transmission mechanism so that the transmission system of the swing can be reversed at a slow speed when the aircraft turns. The radius can be made smaller, which is more advantageous.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an agricultural work vehicle according to the present invention.

FIG. 2 is a schematic rear view of the agricultural work vehicle.

FIG. 3 is a transmission diagram showing an example of a mission of an agricultural work vehicle according to the present invention.

FIG. 4 is an operation explanatory view showing an initial state of a left turn of the agricultural work vehicle according to the present invention.

FIG. 5 is an operation explanatory view showing an intermediate state of the left turning of the agricultural work vehicle.

FIG. 6 is an operation explanatory view showing the final state of the left turning of the agricultural work vehicle.

[Explanation of symbols]

 1 vehicle body 2 left running part 3 right running part 4 left vertical axis (left input shaft) 5 right vertical axis (right input shaft)

Claims (1)

[Scope of utility model registration request] 1. A left running portion (2) arranged below a vehicle body (1).
Each of the right and left running parts (3) is equipped with relative rotation with respect to the vehicle body (1) about the vertical axis (4) (5) centered at the center of each running part (2) (3), After the running part (2) or (3) of the swivel arm is fixed or substantially fixed, the other running part (3)
Alternatively, (2) and the vehicle body (1) are turned around the longitudinal axis (4) or (5) of the turning lobe to turn 180 degrees, and then the running section (2) or ( A turning device for an agricultural work vehicle, characterized in that the rotating directions of (3) are switched so that the rotating directions of both traveling parts (2) and (3) are made to coincide with each other.