KR100485258B1 - Working vehicle - Google Patents

Abstract

The present invention allows switching between forward and backward with only a lever operation without pedal operation, and improves the operability of the forward and backward switching operation when not driving in a seat.

In the traveling vehicle body 2 which transmits the power of the prime mover 20 to the traveling parts 7 and 8 via the belt type transmission 41 and the forward-backward switching device 72, the said belt type transmission 41 ) And a common shift lever 30 for operating the forward and reverse switching device 72, and the shift lever 30 is operated at a position at which the forward and reverse switching device 72 becomes forward and backward neutral. The device 41 was brought to an electric stop.

Description

Driving body {WORKING VEHICLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling vehicle body suitable for an agricultural work machine for transmitting power of a prime mover to a traveling portion via a belt type transmission and a forward and backward switching device.

There is a traveling body of a passenger rice transplanter which transmits the power of the prime mover to a traveling part via a belt type transmission for adjusting the vehicle speed and a gear type transmission for switching the peripheral speed including forward and backward. Conventionally, this type of traveling body is provided with a sub-speed lever for operating the belt type transmission and a peripheral speed lever for operating the gear type transmission, respectively. I was trying to operate the peripheral lever.

Therefore, the above-mentioned conventional traveling vehicle could not change forward and backward unless it was in a seated position. It is convenient to be able to perform the above operation while standing up at the time of mother supply or fertilizer supply. Therefore, the object of the present invention is to enable switching between forward and backward only by lever operation without pedal operation.

In order to solve the said subject, this invention was comprised as follows. That is, the traveling vehicle body according to the present invention is a traveling vehicle body for transmitting the power of a prime mover to a traveling unit via a belt type transmission device having a split pulley and a forward and backward switching device, wherein the belt type transmission device and the forward and rearward switching device are provided. If a common shift lever for operating the shift lever is operated forward than the forward / nearward neutral position, the shifter moves forward. If the shifting lever is operated rearward than the forward / neutral position, the shifter moves backward. If the shift lever is operated forward and backward than the position at which it is forward and backward neutral, the interval between the pair of constituent members constituting the split pulley of the belt-type transmission is changed according to the amount of operation, and the speed is increased. When the shift lever is operated to a position where the switching device becomes forward and backward neutral, the change of the mutual spacing of the pair of constituent members The power transmission belt is batchyeoseo in the free rotation roller, and that the belt-type transmission wherein the transmission is configured such that a stop. With such a configuration, it is possible to switch back and forth by only operating the shift lever.

EMBODIMENT OF THE INVENTION Hereinafter, the Example shown in drawing is demonstrated.

1 and 2 are an overall side view and a plan view of a fertilizer rice transplanter equipped with a traveling vehicle body according to the present invention. In the fertilizer rice transplanter 1, the seedling planting part 4 of 5 breakfast plantings is provided in the rear of the traveling vehicle body 2 via the lifting link device 3, and the traveling vehicle body ( The main body part of the fertilizer 5 which consists of fertilizer tanks 220L, 220R, fertilizer discharge parts 221, ... is provided in the upper part of 2). In addition, spare left and right ends 6,.

The traveling vehicle body 2 is a four-wheel drive vehicle having a pair of left and right front wheels 7 and 7 and rear wheels 8 and 8, which are driving wheels, as a running portion, and as shown in FIG. 3, a mission provided at the front of the body. The front wheel axle cases 11, 11 are installed to extend laterally from the left and right side portions of the case 10, and the front wheels (final case 12, 12) are installed so as to be able to change directions at their distal ends. 7, 7) are rotatably supported, and the front ends of the left and right pairs of main frames 13 and 13 are fixed to the rear surface of the mission case 10, and the rear side extends from the rear end of the main frame to the left and right directions. The rear wheels 8 and 8 are rotatably supported by the rear wheel final cases 15 and 15 fixed to the distal end of the frame 14. On the rear frame 14, a pair of left and right link support frames 16 and 16 for supporting the lifting linkage device 3 protrude upward.

An engine 20, which is a prime mover, is mounted on the front and rear central portions of the main frames 13 and 13, and a seat 22 is provided on an engine cover 21 covering the upper portion of the engine. The front of the seat 22 is a bonnet 23 in which various operation mechanisms are built, and a steering wheel 24 for steering the front wheels 7 and 7, which is a steering wheel, is installed above the seat 22. It is. The circumference | surroundings of the engine cover 21 and the bonnet 23 are the scaffold 25 for a person to move or work. In the drawing, reference numeral 30 denotes a shift lever, 31 an auxiliary shift lever, 32 an oscillator elevating lever, 33 a clutch brake pedal, 34 a clutch brake lever, 35 a differential gear pedal, 36 a choke handle and 37 a lift control. The sensitivity control lever.

Next, the power transmission mechanism of the traveling vehicle body 2 will be described.

An engine output shaft 40 protrudes from the left side portion of the engine 20, and the rotational power of the engine output shaft 40 is interposed between the belt transmission 41 and the belt transmission 42 provided with the main clutch function. Thus, it is transmitted to the mission input shaft 43 protruding from the left side portion of the mission case 10. In addition, the hydraulic pump 45 is provided on the extension line of the engine output shaft 40 to the outside of the belt type transmission 41, the hydraulic pump 45 is driven directly by the rotational power of the engine output shaft (40). In this way, by applying rotational power from the upstream side of the belt type transmission 41 or the belt transmission 42, the rotation of the hydraulic pump 45 can be stabilized without being influenced by the sliding or pulsation of the belt. have.

4 to 6 show the configuration of the belt type transmission. The belt type transmission 41 includes a drive pulley 50 coupled to the engine output shaft 40 so as to be integrally rotated, and a driven pulley 52 to which rotation is freely coupled to the relay shaft 51. Tension is applied to the belt by the tension pulley (54). The driving pulley 50 and the driven pulley 52 are divided pulleys, and the transmission ratio is changed by changing the effective diameters of both pulleys 50 and 52 to each other in opposite directions, and the effective diameter of the electric pulley 50 is changed. If it is below a certain level, the motor stops. In detail, it is comprised as follows.

As for the drive pulley 50 which is a split pulley, one structural member 50a is free to slide in an axial direction, and the mutual space | interval of a pair of structural members 50a and 50b is changeable.

The movable structural member 50a is regulated by the drive shift control cam 57 which is free to mutually rotate through the bearing 56. As shown in FIG. The outer surface of the drive shift operation cam 57 is formed with an arc-shaped projection 57a having a protruding amount that varies depending on the position on the circumference, and the projection 57a is fitted to the roller 58 provided at the fixed position. Is touching.

Similarly, in the driven pulley 52, one component member 52a is free to slide in the axial direction, and the mutual spacing of the pair of component members 52a and 52b is changeable. The movable structural member 52a is regulated by the driven shift control cam 61 which is free to mutually rotate through the bearing 60. As shown in FIG. The outer side of the driven shift operation cam 61 is formed with an arc-shaped protrusion 61a having a different projecting amount depending on the position of the circumference, and the protrusion 61a is fitted to the roller 62 provided at the fixed position. Is touching.

The arm portion 57b of the drive shift control cam 57 and the arm 64 of the driven shift control cam 61 are connected by a connecting rod 65. In the mounting member 66 provided with the arm 64, the base is freely coupled to the relay shaft 51 at the left and right inner positions of the driven pulley 52, and is positioned at the left and right outer sides of the driven pulley 52. The tip is fixed to the driven shifting cam 61 at. In addition, another arm 67 is provided at the base of the mounting member 66, and a shift control rod 68 that is linked to the operation of the shift lever 30 is connected to the arm 67. With the above configuration, the drive shift operation cam 57 and the driven shift operation cam 61 having different left and right positions can be linked with each other without difficulty, and the shift operation rod 68 can be disposed at a position that does not interfere. .

When the shift operation rod 68 is moved back and forth, the shift operation cams 57 and 61 rotate to change the contact points of the projections 57a and 61a to the rollers 58 and 62, thereby shifting the shift operation cams 57 and 61 to it. As the movable constituent members 50a and 52a which are regulated in position move in the axial direction in accordance with the tension of the transmission belt 53, the effective diameters of the driving pulley 50 and the driven pulley 52 change in opposite directions. The larger the effective diameter of the drive pulley 50 and the smaller the effective diameter of the driven pulley 52 become high speed transmission.

If the effective diameter of the drive pulley 50 is minimized, the drive pulley 50 will idle against the electric belt 53, and the belt-type transmission 41 will be in an electric stop state. At this time, since the transmission belt 53 is supported by the roller 69 which is free to rotate with respect to the engine output shaft 40, the transmission belt 53 does not move along with the drive pulley 50.

The belt transmission device 42 connects the electric belt 42c to the driven pulley 42b which is integral with the driven pulley 52 of the belt type transmission 41 and the driven pulley 42b provided on the mission input shaft 43. The tension is applied to the transmission belt 42c by the tension pulley 42d. When the tension pulley 42d is separated from the transmission belt 42c, the rotational power of the engine 20 is transmitted to the mission case 10. It is set to the state of the main clutch "off" which is not transmitted.

7 is a diagram illustrating an internal structure of the mission case. The rotational power input to the mission input shaft 43 via the belt transmission device 42 as the main clutch is a part having each shift position of "road running speed", "normal planting speed", "ultra low speed" and "neutral". It is transmitted to the sub transmission shaft 71 via the transmission 70. A part of the rotational power of the sub transmission shaft 71 is transmitted to the brake shaft 73 via the forward and backward switching device 72 as driving power. The forward and backward switching device 72 transmits power in the forward direction, which transmits power from the sub transmission shaft 71 to the brake shaft 73 in the reverse rotation direction, and reverse power, which transmits the power in the same direction. It is possible to switch the "PTO" which does not.

The brake shaft 73 is provided with a four-wheel brake device 75. 75a is an operation arm of the four-wheel brake device. Then, the rotational power of the brake shaft 73 is distributed to the left and right front wheel axles 77 and 77 by the differential gear device 76 and transmitted to the front wheel final cases 12 and 12 by the front wheel axle. It is driven to drive the front wheels 7 and 7. 76a is a differential gear lock pin that stops the differential gear function of the differential gear device 76. Rear wheel clutch and brake devices 78 and 78 are respectively provided on the left and right front wheel axles 77 and 77, and the rear wheel driving power extracted from the rear portion of the mission case 10 is passed through the rear wheels. It is transmitted to the rear wheel final cases 15 and 15 via the transmission shafts 79 and 79 to drive the rear wheels 8 and 8. In conjunction with the operation of the steering wheel 24, the inner rear wheel clutch and brake device 78 that rotates is automatically operated.

The rest of the rotational power of the sub transmission shaft 71 is transmitted to the PTO output shaft 83 via the pair of aeration gears 81 and 82 as a rotational power PTO for driving the work device. . The sub-gear gears 81 and 82 are disposed inside the right side of the mission case 10. The cover 84 is detachably attached to the outer side to replace the sub-gear gears with different gear ratios. It is possible. A PTO transmission shaft 85 is connected to the rear end of the PTO output shaft 83, and the PTO is transmitted to the planting clutch case 86 via the shaft.

The PTO delivered to the planting machine clutch case 86 is branched into fertilizing power and planting power, and the fertilizing power is taken out of the planting machine clutch case 86 via the fertilizing clutch having a safety clutch function. The planting machine power is taken out from the planting machine clutch case 86 via the aeration device and the planting clutch. The planting machine power taken out from the planting machine clutch case 86 is transmitted to the planting unit 4 via the planting machine transmission shaft 88 after passing through the planting machine safety clutch 87 provided in the output part of the said case.

The operation mechanism of the shift lever 30 is shown in FIG. 8 and FIG. The shift lever 30 is provided on the lower left side of the steering wheel 24, and can rotate left and right with the shaft 90 as a point, and can rotate back and forth with the shaft 91 as a point. When the shift lever 30 is operated left and right, the forward and backward switching rod 93 is moved up and down via the forward and backward switching arm 92, and the forward and backward switching device 72 is switched. In addition, when the shift lever 30 is operated back and forth, the shift operation rod 68 is moved back and forth through the linking portion 94 including an arm, a connecting rod, a relay shaft, and the like, and the belt-type transmission 41 shifts. Manipulated. The operating range of the shift lever is regulated by the lever guide 95.

The lever guide 95 has the shape shown in FIG. 10. When the front and rear positions of the shift lever 30 are at N, the belt-type transmission 41 is in an electric stop state. The speed increases according to the operation amount. In the forward and backward switching device 72, the shift lever 30 is "PTO" at the left and right center positions, "forward" at the right position, and "reverse" at the left position. In "PTO" and "forward", the shift lever 30 can be operated only in the forward zone F before N, and in "reverse", the shift lever 30 in the reverse zone R behind the N Can only be operated.

Therefore, when the shift lever 30 is operated forward than N, it is always forward, and when it is operated backward than N, it is always backward. Since the operation direction of the shift lever 30 and the traveling direction of the body coincide, it is easy to sense. When switching from the forward to the reverse or vice versa, the belt-type transmission 41 is always in the electric stop state in the process. Therefore, the operation of the shift lever 30 can be performed only by operating the shift lever 30 without turning the main clutch "off". You can switch. In addition, since the lever stroke of the reverse zone R is made smaller than the lever stroke of the forward zone F, the maximum speed of the reverse is regulated, so it is safe. In addition, when the forward / backward switching device 72 operates the shift lever 30 to the advance zone F in "PTO", only the working device is driven without driving.

The sub transmission lever 31 for switching the sub transmission 70 is provided at the front position of the seat 22. Since all the levers 30 and 31 related to the shifting are normally arranged to operate with the left hand, it is easy to understand. The shift lever 30, which has a greater frequency of operation than the sub shift lever 31, is disposed at a position where it is easy to operate.

The operating mechanism of the seedling raising / lowering lever 32 is shown in FIG. 8 and FIG. The seedling raising / lowering lever 32 is provided in the lower right of the steering wheel 24, and can be rotated back and forth using the shaft 130 as a point. Rotation of the planting machine lifting lever 32 is transmitted to each operation unit of the planting machine clutch case 86 and the hydraulic valve 176 which will be described later via the relay shaft 131. 132 is a seedling raising and lowering cam for operating position which is integrally installed in the relay shaft 131, and the cam roller 134 which rotatably supported by the roller support arm 133 abuts on this cam. The roller support arm 133 is urged by the spring 135 toward the cam roller 134 abutting the planting machine lifting cam 132. Accordingly, the seedling raising / lowering lever 32 is operated at each operation position of " raising " raising the seedling base, " falling " lowering the seedling base, " automatic " for automatically raising and lowering the seedling base, and " planting off " It remains stable.

As shown in FIG. 8 and FIG. 12, the lift member 138 is rotatably provided between the roller support arm 133 and the steering post 137. When the steering wheel 24 is operated at a predetermined angle or more, the lift member 138 rotates when the mountain cam 140 provided on the steering shaft 139 presses the pin 141. Then, the round bar portion 138a of the lift member pushes up the roller support arm 133, so that the regulation of the cultivator elevating cam 132 by the cam roller 134 is eliminated, so that the cultivator elevates by the tension of the spring 142. The lever 32 rotates to "up". Therefore, when the steering wheel 24 is operated more than a certain angle, the seedling planting part 4 raises automatically.

8 and 13, a back lift arm 143 is provided between the lift member 138 and the forward and backward switching arm 92. When the shift lever 30 is operated to "reverse", the forward and backward switching arm 92 pushes the roller 143a of the back lift arm 143 to lift the member 138 through the back lift arm 143. ) Is rotated and the seedling raising / lowering lever 32 rotates to "up" as mentioned above. Therefore, when operating the shift lever 30 to "reverse", the seedling planting part 4 will raise automatically. The restoring force that the back lift arm 143 tries to return to the original state acts in the direction of the left and right pivot points (axis 90) of the shift lever 30, and the restoring force in the state where the shift lever 30 is operated to "reverse". Since it is received at the outer end surface of the forward and backward switching arm 102, the shift lever 30 is “reversed” without applying force in the direction of returning the shift lever 30 to “forward and backward neutral (PTO)”. Stable at the position of "

The back lift arm 143 is freely supported by the pivot point shaft 144 and can be slid back and forth by operating the back lift release lever 145. In the state in which the back lift arm 143 is slid backward, the back lift arm 143 is in a state where the front and rear positions are shifted with respect to the forward and backward switching arm 92 and the lift member 138, and the shift lever 30 is moved. Even when operating in "reverse", the planting base part 4 does not raise.

The lifting linkage device 3 supports the upper link 170 and the left and right pairs of lower links 171 and 171 which are parallel to each other when viewed from the side surfaces of the link supporting frames 16 and 16 to be freely rotated. The connecting frame 172 is hingedly coupled to the rear end of each of these links. The rolling frame 173 is inserted into the connecting frame 172 to protrude forward from the planting unit 4, and the planting unit 4 is freely connected to the rolling unit. The swing arm 174 which is integrally rotated with the lower links 171 and 171 is installed, and the piston rod of the hydraulic cylinder 175 whose base side is supported on the main frames 13 and 13 is the swing arm 174. ) When the hydraulic cylinder 175 is expanded and contracted, each link rotates up and down, and the raising and lowering of the mother plant base part 4 is carried out in a substantially constant posture. The hydraulic valve 176 for controlling the hydraulic cylinder 175 is provided below the scaffold 25 in the right part of the body.

The seedling planting unit 4 carries the left and right reciprocating motion by loading the seedlings into the mother seedling unit frame 180 in which the electric mechanism is built in, and at the same time, the feed belts 181a,... A mother tree mounting table 181 for supplying one by one to (181b, ...), and 5 sets of planting devices (183, ...) for taking out the hair supplied to the hair outlets (181b, ...) and planting it on the soil surface. In the next stroke, the left and right line marks (184, 184), the center float 185 and the side floats (186, 186), which line the left and right centers of the gas path on the soil surface, are installed in the next stroke. have.

The fertilizer 5 sends the fertilizer in the fertilizer tanks 220L and 220R downward by a fixed amount by the fertilizer dispensing units 221, ..., and guides the fertilizer through the fertilizer hoses 223, .... It transfers to (224, ...), and falls in the fertilizing groove by the groove | channel manufacturing part 225, ... provided in front of the said fertilizing guide.

Therefore, even if the traveling vehicle body according to the present invention is not seated in a frontal position from the seat, it is possible to switch back and forth even when the vehicle is standing in the vicinity of the seat, for example, and the operation is easy, and the mother spread and fertilizer spread are also available. Emergency response is possible when working on the back, improving safety.

1 is a side view of a sibiang group.

2 is a plan view of a sibiang group.

3 is a plan view in which part of the traveling vehicle body is omitted.

4 is a side view of the belt type transmission.

5 is a plan sectional view of the belt type transmission.

FIG. 6 is a cross-sectional view taken along S-S of FIG. 5.

7 is an exploded sectional view of the mission case.

8 is a front view of the shift lever and the seedling raising / lowering lever operating mechanism.

9 is a side view of the shift lever operating mechanism.

10 is a plan view of the shift lever guide.

11 is a side view of a seedling planting lever operating mechanism.

12 is a cross-sectional view taken along S1-S1 of FIG. 8.

FIG. 13 is a cross-sectional view taken along S2-S2 of FIG. 8.

(Explanation of the sign)

1 ... Sibianggi, 2 ... driving body,

3 ... lifting linkages, 4 ...

5 ... fertilizer, 7 ... front wheels,

8 ... rear wheels, 10 ... mission case,

20 ... engine (motor), 22 ... seat,

30 ... shifting lever, 41 ... belt transmission,

42 ... belt transmission, 72 ... forward and backward switching,

Claims (1)

In the traveling vehicle body which transmits the power of the prime mover 20 to the traveling parts 7 and 8 via the belt type transmission 40 provided with the split pulley 50, and the forward / backward switching device, The said belt type transmission When the common shift lever 30 for operating the 41 and the forward and backward switching device 72 is provided, and the shift lever 30 is operated forward from the position at which forward and backward neutrality is established, the shift lever ( 30) is operated backwards from the forward and backward neutral position, and when the shift lever 30 is operated forward and backward from the forward and backward neutral position, the belt-type transmission 41 responds to the operation amount. The shifting lever 30 is moved to a position where the interval between the pair of constituent members 50a and 50b constituting the split pulley 50 is changed and the speed is increased, and the forward and backward switching device 72 becomes forward and backward neutral. When operating, the change of the mutual spacing of the pair of constituent members 50a, 50b The transmission belt 53, the driving body, characterized in that is configured to rotate the batchyeoseo the free rollers 69, a motorized stationary belt-type transmission (41).