JP2017201955A - Field working car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a field working car which is equipped with a differential lock apparatus and enabled to facilitate the operation of the differential lock apparatus so that the body can run straight and ride over a ridge and can safely go into and out of the farm field.SOLUTION: A field working car is enabled to lock a differential mechanism in a transmission case 19 for transmitting a driving force to right and left running wheels 3 and 3. The field working car 2 is equipped with a differential lock step 22 for establishing the lock state when an operator rides to stand at the differential lock step 22.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a field work vehicle that performs various operations in a field by connecting a work machine such as a seedling transplanter to the rear part of a vehicle body, and belongs to the technical field of agricultural machinery.

  A field work vehicle connected to a farming machine such as a conventional seedling transplanting machine is described in, for example, Patent Document 1, and a structure in which a differential mechanism is provided in a power transmission unit to the left and right drive wheels, and during seedling transplanting work in a field If one side of the left and right drive wheels slips and straight running becomes unstable, the differential mechanism is deactivated and switched to the diff lock state to synchronize the rotation of the left and right drive wheels to improve straight running performance It has been known.

JP 2012-228913 A

  In the above-mentioned field work vehicle, the diff lock device for the left and right front wheels is activated by depressing the lock pedal at the foot while the operator is sitting on the cockpit of the aircraft. Because it leans forwards and backwards and steers while walking down from the aircraft, it is difficult to operate the lock pedal provided on the boarding floor of the aircraft from the outside of the aircraft.

  The present invention is a field work vehicle provided with a diff lock device, and when an operator gets down from a cockpit and steers, the operation of the diff lock device can be easily performed, and the body can be moved straight to get over the rod. The challenge is to enable safe entry and exit.

  The problems of the present invention are solved by the following technical means.

  In the field work vehicle in which the differential mechanism in the transmission case 19 that transmits the driving force to the left and right traveling wheels 3 and 3 can be locked, a differential lock step 22 is provided at the front portion of the body 2. The farm work vehicle is characterized in that the differential mechanism is locked by an operator standing on the differential lock step 22.

  The invention according to claim 2 is characterized in that the diff lock step 22 on the front side of the body 2 and the diff lock pedal 25 on the body 2 are interlocked so that the diff lock pedal 25 enters the diff lock state when the diff lock step 22 is depressed. The farm work vehicle described in Item 1.

  The invention according to claim 3 is characterized in that the differential lock step 22 is levitated and supported, and the operation arm 23 of the differential lock step 22 is slid rearward so that the differential lock pedal 25 is depressed when the differential lock step 22 is depressed. The field work vehicle according to claim 2.

    The invention according to claim 4 is characterized in that the auxiliary grip 21 protrudes in front of the airframe 2 and a non-slip protrusion 22 a is formed on the surface of the differential lock step 22. Field farm vehicles.

  In the first aspect of the invention, when the field work vehicle goes over the ridge, when the diff lock step 22 stands while getting off the body and standing in front of the body, the driving force is transmitted to the left and right traveling wheels 3 and 3. It is safe because the differential mechanism can be locked and the operator's weight can be applied to the front of the aircraft without taking the handle to the left and right to improve the weight balance between the front and rear of the aircraft.

  In the invention according to claim 2, in addition to the effect of claim 1, the diff lock step 22 can also be depressed by using the diff lock mechanism of the diff lock pedal 13, so that the configuration is simplified.

  In the invention according to claim 3, in addition to the effect of claim 2, when the diff lock step 22 stands on the diff lock step 22 and diff locks, the diff lock step 22 projects forward as the operating arm 23 slides backward. Will not hinder forward travel.

    In the invention according to claim 4, in addition to the effect of any one of claims 1 to 3, the worker who rides on the diff lock pedal 13 prevents the slipping of the foot by the anti-slip protrusion 22a of the diff lock step 22. With the auxiliary grip 21, it is possible to travel over the saddle safely.

Side view of a four-row riding rice transplanter in an embodiment of the present invention Top view of a four-row riding rice transplanter Partial schematic side view for explaining the arrangement configuration of the diff lock mechanism and the arrangement configuration of the vehicle height changing mechanism in the passenger rice transplanter Schematic side view of the rear wheel showing the state where the compression spring is extended to the maximum and the vehicle height of the fuselage is increased Passenger rice transplanter control system block diagram Front side view of riding rice transplanter

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. In the description of the embodiment, the left and right directions in the forward direction of the aircraft are referred to as left and right, respectively, the forward direction is referred to as forward, and the backward direction is referred to as rear. However, the configuration of the present invention is not limited.

  FIG. 1 is a side view of a four-row riding rice transplanter that is an example of a field work vehicle of the present invention, and FIG. 2 is a plan view thereof.

  As shown in FIGS. 1 and 2, a four-row riding rice transplanter 1 includes front and rear wheels 3 and 4 that support a vehicle body 2 so as to be able to travel on a field, and a transmission that shifts transmission power to the front and rear wheels 3 and 4. 5, an engine 6 that is a prime mover that supplies power to each device including the transmission 5, and a seedling transplanting device that is supported at the rear of the machine body so as to be able to move up and down and to plant seedlings in the field by branching power from the transmission 5 7, a link mechanism 8 for connecting the seedling transplanting device 7 to the rear part of the machine body, a hydraulic lifting cylinder 9 for moving the seedling transplanting device 7 up and down, and the like. Also, when turning during a seedling transplanting operation in a farm field, a traveling operation lever (also referred to as an HST lever) 10 for operating a traveling speed by switching a transmission, an operation tool for operating various devices, a steering handle 11, and It consists of a control unit 12 and the like on which an automatic turning planting switch 17 and the like for starting automatic lifting, turning and automatic planting are arranged. A handle post 20 that erects the steering handle 11 is provided with a U-shaped auxiliary grip 21 in plan view.

  A front wheel diff lock shaft 13 for locking the differential mechanism inside the mission case 19 is provided under the driver's seat 18, and a diff lock pedal 25 pivotally supported by a pivot shaft 25a is provided on the floor surface. When the operator steps on, the front wheel diff lock shaft 13 is pushed downward to operate the diff lock mechanism, and at the same time, the switch is turned on to move the rear wheel independent swing to the maximum left and right to raise the vehicle height.

  As shown in FIG. 6, the diff lock pedal 25 is triangular in a side view, and when the upper surface is stepped on with a foot, the front wheel diff lock shaft 13 is pushed downward on the rear inclined surface.

  Further, a contact plate 24 fixed to the rear end of the operation arm 23 of the differential lock step 22 provided on the front side of the airframe 2 is in contact with the front inclined surface of the differential lock pedal 25.

  The actuating arm 23 of the differential lock step 22 is at the lower part of the machine body 2, and the horizontal shaft 23 a is fitted into the circular arc groove 26 a of the front support portion 26 and is slidably fitted in the slide hole of the rear support portion 27. The horizontal shaft 23a is pulled upward. Accordingly, when the diff lock step 22 is pushed down, the horizontal shaft 23a moves inward of the fuselage 2 while moving downward along the arc groove 26a against the tension spring 28, so that the contact plate 24 is tilted forward of the diff lock pedal 25. The surface is pushed and rotated rearward to push the front wheel diff lock shaft 13 down by the front inclined surface of the diff lock pedal 25 to enter the diff lock state.

  As shown in FIG. 2, the diff lock step 22 protrudes forward from the machine body 2 and is formed with a non-slip protrusion 22 a protruding in an arc shape on the upper surface so that an operator can stand up.

  A brake pedal 405 is provided under the driver's seat 18.

  The transmission 5 includes a hydrostatic continuously variable transmission, abbreviated as HST, and an angle of a trunnion shaft (not shown) by a motor electric operation that performs forward / reverse switching and a continuously variable transmission linked to the operation of the traveling operation lever 10. By adjusting, the engine power received by the transmission of the belt 5a is transmitted to the front and rear wheels 3 and 4 so as to be able to shift from the stop speed to the maximum speed for each of the medium-low speed range traveling and the high-speed range traveling. To do.

  The engine 6 is configured so that the driving power in the power characteristic range in the reverse driving mode, the low fuel consumption driving mode, the standard driving mode, and the high output driving mode can be covered by motor electric adjustment of the throttle opening. Drives auxiliary machinery such as a hydraulic pump for driving.

  The seedling transplanting device 7 is driven up and down by hydraulic power and is horizontally supported by adjusting the rolling angle, and is configured to be able to plant by the branching power from the transmission 5 in conjunction with the vehicle speed. In this example, the seedling transplanting device 7 has a four-row planting structure, and seedlings corresponding to the number of planting strips on which a mat-like seedling with soil is placed on the seedling placement surface partitioned by the number of planting strips. It is composed of a mounting tank 14, a planting section 15 for planting the seedlings on the seedling mounting tank 14 to the field, a side float 16 that slides on the field scene, and a center float 16c. ing.

  Moreover, the planting part 15 provided with the planting claw 15a which isolate | separates and hold | maintains a seedling from the lower end part of each seedling mounting tank 14, and plantes the held seedling in a farm field can turn to the rotary case 400. It is attached. At the time of planting operation, the rotary case 400 is rotated so that the tip of the planting claw 15a draws a planting locus line E (see FIG. 1) having a substantially elliptical shape when viewed from the side to perform seedling planting operation. It is.

  Further, a side cross section as a guide for the seedling placement tank 14 that reciprocates in the left-right direction is provided at the lower rear portion of the seedling placement tank 14 in a multi-row planting form that accommodates mat-like seedlings and feeds them downward to the rear side. An L-shaped front plate 401 is provided (see FIGS. 1 and 2). The front plate 401 has a substantially U shape in top view at a position corresponding to the locus line E through which the planting claws 15a pass in order to separate the seedlings from the mat-like seedlings at the lower end of each seedling placement tank 14. A mold seedling plate 402 is attached, and a seedling port 403 is formed as a space through which the planting claws 15a pass (see FIG. 2).

  Next, the differential lock mechanism 170 built in the mission case 19 and the rear wheel height adjusting cylinder motor 110 provided in the riding rice transplanter 1 of the present embodiment will be described with reference to FIGS. To do.

  FIG. 3 shows the arrangement configuration of each part for operating the differential lock mechanism 170 and the arrangement configuration of the rear wheel vehicle height adjusting cylinder motor 110 and the like constituting the vehicle height changing mechanism in the passenger rice transplanter 1 of the present embodiment. It is a partial schematic diagram for explaining.

  As shown in FIG. 3, the front wheel differential lock shaft 13 is held by a spring member (not shown) so as to be movable up and down, and a tip portion 13 a projects upward from a vehicle body floor under the feet of the driver seat 18 by a predetermined dimension. A front wheel diff lock pedal shaft portion 13b having a switch driving protrusion 13c extending horizontally in the middle extends downward from the vehicle body floor, and a lower tip portion 13d of the front wheel diff lock pedal shaft portion 13b is a first movable angle 171. One end of the flange portion 171 is in contact with the upper surface of the flange portion 171a bent in the horizontal direction.

  The front wheel differential lock pedal operation detection switch 150 is disposed below the switch driving protrusion 13c. When the operator steps on the front wheel differential lock shaft 13, the switch driving protrusion 13c moves downward to move the front wheel differential lock pedal 13c. By pressing the projection of the operation detection switch 150, it is detected that the front wheel differential lock pedal 13 has been operated, and the detection signal is sent to the control unit 200 (see FIG. 5) described later. The control unit 200 that has received the detection signal outputs, for example, a drive signal for driving a rear wheel height adjusting cylinder motor 110 (see FIGS. 3 and 4), which will be described later.

  The first movable angle 171 is configured such that the other end 171b of the substantially rectangular underframe 2a constituting the skeleton part of the machine body 2 is rotatably held by the rotation shaft 172, so that the operator can rotate the front wheel diff lock shaft. When stepping on 13, the lower front end portion 13d of the front wheel differential lock pedal shaft portion 13b rotates in the direction of arrow A by pushing down the upper surface of the flange portion 171a.

  On the other hand, the mission case 19 has a second movable angle 173 for switching the differential function (a function of absorbing the difference in the rotational speed of the left and right driving wheels while transmitting the driving force from the engine to the driving wheels) to the locked state. Is provided. One end of the second movable angle 173 is inserted into the mission case 19, and the other end 173 b is connected to the flange 171 a of the first movable angle 171 by a wire 174. Further, the second movable angle 173 is held so as to be rotatable about a rotation shaft 173a disposed at substantially the center of both ends. The wire 174 is connected to the spring spring 175 in the vicinity of the center, and is always pulled in the forward direction of the machine body 2 (leftward in FIG. 3).

  When the operator depresses the front wheel differential lock pedal 13, the flange portion 171a rotates in the direction of arrow A, and the wire 174 linked thereto pulls the other end portion 173b of the second movable angle 173 in the B direction. Thereby, one end portion of the second possible angle 173 inserted into the mission case 19 moves in the direction opposite to the B direction, and the differential function is brought into the locked state.

  The tilt detection sensor 160 is disposed on the upper surface of the underframe 2a of the airframe 2 and slightly closer to the rear wheel side than the middle of the front wheels 3 and the rear wheels 4, and the front side of the airframe 2 is greatly upward. (In this embodiment, it is tilted by 10 ° or more), and the detection signal is output to the control unit 200. The tilt detection sensor 160 is configured to detect only when the machine body 2 is largely tilted forwardly, and does not work when the body 2 is tilted forward. In addition, the tilt detection sensor 160 may be configured to detect the tilt angle itself, or may be configured to detect an angular velocity due to the tilt. In short, any method can be used as long as it can detect that the airframe 2 is greatly tilted forward. It may be a configuration. The control unit 200 receives a detection signal from the inclination detection sensor 160 and outputs a signal for driving the differential lock operating cylinder motor 100 (see FIG. 5).

  The differential lock actuating cylinder motor 100 has a main body portion held above the first movable angle 171, and the tip of the cylinder rod 100 a that expands and contracts when driven is fixed to the first movable angle 171 so as to be rotatable. Yes. Upon receiving the extension drive signal from the control unit 200, the differential lock actuation cylinder motor 100 drives the cylinder rod 100a to extend to a predetermined length. As a result, the first movable angle 171 rotates in the direction of the arrow A around the rotation axis of the other end 171b even when the operator does not step on the front wheel differential lock pedal 13, and thus interlocks with the first movable angle 171. Similar to the case where the operator depresses the front wheel differential lock pedal 13 by the movement of the wire 174, the differential function is set to the locked state.

  The rear wheel height adjusting cylinder motor 110 is fixed at the rear end 2a1 of the under frame 2a and above the left and right rear wheel transmission cases, respectively, and the tip of the cylinder rod 110a that expands and contracts when driven The rear wheel transmission case 111 is fixed to be freely rotatable. When the rear wheel height adjusting cylinder motor 110 receives a drive signal from the control unit 200, the rear wheel height adjusting cylinder motor 110 extends the cylinder rod 110a to the maximum. Thereby, the rear wheel transmission case 111 in the direction in which the compression spring (not shown) configured to allow the rear wheel to swing independently on the left and right is extended to the maximum extent, that is, on the left and right, is centered on the rotation shaft portion 112. By turning in the C direction, the vehicle height H0 (see FIG. 3) of the airframe 2 becomes H1 (H0 <H1) (see FIG. 4). FIG. 4 is a schematic view of the rear wheel portion showing a state in which the compression spring is extended to the maximum by driving the cylinder rod 110a and the vehicle height of the airframe 2 is increased. As a result, the independent swing function of the left and right rear wheels does not work, but the vehicle height increases.

  The front wheel rotation speed detection sensor 140 is arranged so that the rotation speeds of the left and right front wheel drive shafts of the mission case 19 can be independently detected, and the left and right detection results are output to the control unit 200.

2 Airframe 3 Running wheel 19 Mission case 21 Auxiliary grip 22 Differential lock step 22a Non-slip protrusion 23 Actuating arm 25 Differential lock pedal

Claims (4)

  In a farm work vehicle in which the differential mechanism in the transmission case (19) that transmits driving force to the left and right traveling wheels (3, 3) can be locked, a diff lock step (22) is provided at the front of the body (2), An agricultural field work vehicle, wherein an operator stands on the differential lock step (22) to lock the differential mechanism.   The differential lock step (22) on the front side of the fuselage (2) and the differential lock pedal (25) on the fuselage (2) are set so that the differential lock pedal (25) is in the differential lock state when the differential lock step (22) is depressed. The field work vehicle according to claim 1, wherein the field work vehicle is interlocked.   The differential lock step (22) is levitated and supported, and when the differential lock step (22) is stepped on, the operating arm (23) of the differential lock step (22) is moved backward so that the differential lock pedal (25) is stepped on. The agricultural field work vehicle according to claim 2, which slides.   The auxiliary grip (21) protrudes in front of the airframe (2), and a non-slip protrusion (22a) is formed on the surface of the differential lock step (22). The field work vehicle described.

Images