JP2004017777A - Farm working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auxiliary brake applying brake interlocking with the disengaging operation of a clutch pedal, only when running speed is changed to the super low speed side. <P>SOLUTION: When operating a sub-speed change lever 64 to the super low speed side to cross a levee, a machine body can climb the levee of a steep slope at a super low speed/high torque. In the speed changing to the super low speed side, the inner wire 142 extending from the sub-speed change lever 64 to the auxiliary brake device 125 is drawn, as a result, a control plate 143 turns around a fulcrum shaft 145 and a projection pin 144 goes into a clearance section 147. As a result, when the clutch pedal 30 is stepped in running at a super low speed, the stepping force is transmitted to a cylindrical member 77b from a clutch shaft 56 through a cylindrical member 77a and the projection pin 144, operating the auxiliary brake device 125. During at a speed other than the super low speed, since the projection pin 144 is released from the clearance section 147, even if the clutch pedal 30 is stepped, the stepping force is not transmitted to the auxiliary brake 125. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an agricultural work machine such as a riding rice transplanter.
[0002]
[Prior art]
2. Description of the Related Art In an agricultural work machine such as a riding rice transplanter, a steep ridge may be crossed when the machine enters or exits a field. When crossing this ridge, the aircraft is greatly inclined back and forth, so that it is possible to cross the ridge by high-torque running at a speed lower than normal running speed (so-called ultra-low speed running) so that the operator can operate while getting off. Those are known.
[0003]
Further, when the riding rice transplanter is moved to a remote place, the aircraft may be loaded on a carrier such as a truck and transported. In this case, when loading / unloading, for example, an operator may use the riding rice transplanter. There is a case where the vehicle is loaded and unloaded by traveling at an extremely low speed on a handover plate (inclined plate) while riding on the aircraft.
[0004]
[Problems to be solved by the invention]
However, conventionally, in the case of getting off and maneuvering, the on / off operation of the traveling clutch had to be performed by a dedicated switching lever provided separately, so that the clutch operation and the like were troublesome.
[0005]
Also, conventionally, when the clutch pedal is depressed, the transmission of the driving force to the driving wheels is cut off.Therefore, for example, when the operator loads or unloads the airframe on a truck or the like while the operator is on board, Pressing the clutch pedal could cause the aircraft to descend unintentionally. On the other hand, when the clutch pedal is depressed during normal running other than the so-called ultra-low speed running, the abrupt stop of the aircraft is not preferable in terms of driving feeling.
[0006]
The present invention has been made to solve such a problem, and an object of the present invention is to interlock with the disengagement operation of the clutch operating tool only in a state where the traveling speed is shifted to a high torque traveling side on a steep slope. To provide an agricultural work machine provided with an auxiliary brake device that performs a braking operation.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention provides a power transmission device for transmitting power from an engine (20) to drive wheels (12, 14) via a clutch (29) and a speed change mechanism (67). 19), a speed change operation means (64) for operating the speed change mechanism (67) to change the traveling speed, a brake device (33) for stopping the traveling of the body, and an on / off operation of the clutch (29) for the power. And a clutch operating tool (30) for connecting and disconnecting the transmission device (19).
An auxiliary brake device (125) that is disposed on the power transmission device (19) downstream of the transmission of the clutch (29) and that operates based on a depression operation of the clutch operation tool (30);
An auxiliary brake operating means (140) for operating the auxiliary brake device (125) based on an operation toward a high torque running side on a steep slope by the shift operating means (64). It is characterized by the following.
[0008]
[Action]
According to the present invention, for example, when moving the agricultural work machine (10) into and out of the field, the aircraft (16) may cross over the steep ridges. In such a case, the aircraft is driven with high torque. In order to drive the vehicle, the speed change operation means (64) is operated to shift to a high-torque running side on a steep slope. Then, the speed change mechanism (67) is operated to change the speed, so that the aircraft can climb the steep ridge at low speed and high torque. At this time, when the shift operation means (64) is shifted to the high torque traveling side on a steep slope, the auxiliary brake operation means (140) acts so that the auxiliary brake device (125) can be operated. .
[0009]
For this reason, when the clutch operating tool (30) is stepped on in the high torque running state, the depression force is transmitted to the auxiliary brake device (125) via the auxiliary brake operating means (140), and the auxiliary brake device (125) is turned on. Operate. However, even if the clutch operating tool (30) is depressed in a state other than during high-torque running, the auxiliary brake device (125) does not operate.
[0010]
In addition, the code | symbol in parenthesis mentioned above is for referring to drawings, and does not limit this invention at all.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 and 2 are an overall side view and a plan view of a riding rice transplanter as an agricultural working machine according to the present invention. The riding rice transplanter 10 has a traveling machine body 16 supported by a front wheel 12 and a rear wheel 14, and the traveling machine body 16 has an engine 20 mounted in a front hood 18. A driver's seat 28 having a steering handle 24, a seat 26, various operation levers, and the like is disposed on the traveling body 16. A stepped surface of the driver's seat 28 includes a clutch pedal 30 and a brake pedal. 35R and 35L are provided.
[0013]
At the rear of the engine 20, a transmission case 22, which is integral with the engine 20 and in which the front wheel 12 is supported, is mounted. The power of the engine 20 is transmitted to the transmission case via a belt-type continuously variable transmission mechanism. 22. The input power is transmitted to the front wheels 12 after being shifted by the transmission case 22, and is also transmitted to the rear wheels 14 via the traveling PTO shaft 122 (see FIG. 3). Further, power for work is transmitted from a rear portion of the transmission case 22 to a planting section 32 described later via a planting PTO shaft 43 (see FIG. 1).
[0014]
A planting portion 32 is supported by a hydraulic cylinder 41 so as to be able to move up and down via a link mechanism 34 behind the traveling machine body 16. The planting portion 32 has a large number of planting rods 36, floats 37, and A seedling mounting table 38 on which mat seedlings can be mounted is provided. Auxiliary seedling mounts 39, 39 are provided on the left and right sides of the hood 18 at the front of the fuselage.
[0015]
FIG. 3 is a development view of the internal structure of the transmission case 22.
[0016]
Referring to FIG. 2, the power transmission device 19 of the traveling system will be briefly described. The power transmission device 19 includes a large number of gears for power transmission, a transmission shaft, and the like, and transmits power from the engine 20 to a clutch 29 described later. The transmission mechanism 67 has a transmission mechanism 67 having various gears and a transmission shaft on the downstream side of the transmission to transmit the transmission to the front wheels 12 and the rear wheels 14.
[0017]
That is, the power from the engine PTO shaft 21 is transmitted to the shaft S1 by the continuously variable transmission belt 23. The shaft S1 is provided with a clutch 29 and a gear G1, and the power transmitted to the shaft S1 is transmitted to the clutch 29. And transmitted to the downstream side of the transmission. The clutch 29 is turned on and off based on the operation of a clutch pedal (clutch operating tool) 30 to turn on and off power.
[0018]
The main transmission shift gear G2 and the sub transmission shift gear G2 'are provided on the shaft S2, and the power transmitted to the shaft S1 is transmitted to the shaft S2 via the gear G1 and the main transmission shift gear G2. Power is transmitted from the shaft S2 to the shaft S3 via the gear G3, and the power transmitted to the shaft 3 is transmitted to the traveling PTO shaft 122 and the propeller shaft 123 via the ring gear GR of the differential D. , The rear axle 25 is driven.
[0019]
The rear axle 25 is provided with a side clutch 31 and a side brake (brake device) 33, and when one of the left and right brake pedals 35R, 35L is depressed, the transmission of power is interrupted by the side clutch 31. In this state, the rear wheel 14 is braked by the side brake 33.
[0020]
As shown in FIG. 4, a relay box 60 is integrally fixed to the transmission case 22 by bolts 61, and a shift arm 62 is pivotally mounted on the relay box 60 by a fulcrum shaft 63. I have. To one end of the shift arm 62, a sub speed change lever 64 as a speed change operation means is fixed, and to the other end, a shift rod 65 is attached so as to be movable in the axial direction. A shift plate 66 is attached to the working side of the shift rod 65.
[0021]
Then, the knob 64a of the sub-transmission lever 64 is gripped, and the sub-transmission lever 64 is moved to each position of "running", "neutral (N)", "work", and "high-torque running on a steep slope (ultra-low speed running)". Is operated, the sub-transmission lever 64 is swung about the fulcrum shaft 63. By this swing operation, the shift rod 65 on the tip end side of the shift arm 62 moves in the axial direction, and the shift plate 66 provided at the end of the shift rod 65 moves in the same direction. The meshing of each gear constituting the transmission mechanism 67 is switched, and the body is shifted to a desired traveling speed.
[0022]
Here, in the present embodiment, an auxiliary brake device 125 that is disposed on the downstream side of the transmission of the clutch 29 in the power transmission device 19 and operates based on the depression operation of the clutch pedal 30, An auxiliary brake operating means 140 is provided which operates based on an operation on the high torque running side (ultra low speed side) to enable the auxiliary brake device 125 to operate.
[0023]
In FIG. 3 described above, an auxiliary brake device 125 having a brake shoe 126 (see FIG. 5) that can freely contact and separate from the traveling PTO shaft 122 is arranged on the downstream side of the transmission of the clutch 29. As shown in FIG. 5, the auxiliary brake device 125 has a brake shoe 126 fixed to a brake arm 127, and the brake shoe 126 is integrally rotatably disposed on the outer periphery of the traveling PTO shaft 122. It is arranged above and facing the grooved pulley 124. The brake arm 127 has a base end rotatably mounted on a rotation fulcrum shaft 128 and a collar 132 attached to a distal end. A brake operation rod 120 is slidably fitted to the collar 132, and the collar 132 is constantly urged downward in the drawing by a spring (compression) 134.
[0024]
As shown in FIG. 5, the clutch pedal 30 and the auxiliary brake device 125 are connected by a connecting mechanism 27, and the above-described clutch 29 is disconnected and the auxiliary brake The traveling PTO shaft 122 is pressed by the brake shoe 126 of the device 125, and the traveling PTO shaft 122 is braked.
[0025]
That is, in FIG. 5, the linking mechanism 27 is integrally formed with a clutch shaft 56 that is integrally rotatably connected on the base end side of the clutch pedal 30 at an intermediate position in the longitudinal direction of the clutch shaft 56. It has a fixed L fitting 75 and a pressing bolt 76 attached to the L fitting 75 via a tubular member 77 so as to be position adjustable. Then, based on the depressing operation of the clutch pedal 30, the pressing bolt 76 is pressed downward via the linkage mechanism 27, and the contact member 136 of the auxiliary brake device 125 is moved downward, so that the brake shoe 126 moves the traveling PTO shaft. It is configured to perform a braking operation by pressing 122. The brake pressure can be adjusted by adjusting the amount of protrusion of the pressing bolt 76.
[0026]
Next, as shown in FIG. 6, the auxiliary brake operation means 140 includes an inner wire 142 having one end fixed to the shift arm 62 via the pin 141 (see FIG. 4) and the other end fixed to the control plate 143. And a projecting pin 144 attached to the control plate 143. The control plate 143 is rotatable about a fulcrum shaft 145, and the protruding pin 144 is constantly urged rightward in FIG. 6 by a spring (compression) 146. On the other hand, a cylindrical member 77 is connected to the L fitting 75 described above, and the cylindrical member 77 has cylindrical members 77 a and 77 b vertically opposed to each other via a gap 147. A protruding pin 144 is configured to be able to protrude and retract in the gap 147.
[0027]
When the sub-transmission lever 64 is operated to the extremely low speed side, the inner wire 142 is pulled in the direction of the arrow in FIG. 6, the control plate 143 is rotated about the fulcrum shaft 145 in the direction of the arrow, and the projecting pin 144 is moved in the direction of the arrow. Projecting into the gap 147. When the clutch pedal 30 is depressed in this state, the depression force is transmitted to the clutch shaft 56, the L bracket 75, the upper tubular member 77a, the protruding pin 144, the lower tubular member 77b, and the pressing bolt 76 in FIG. Then, the auxiliary brake device 125 operates.
[0028]
On the other hand, when the sub-transmission lever 64 is operated to a position other than the ultra-low speed side, the protruding pin 144 enters through the gap 147, and even if the clutch pedal 30 is depressed in this state, the depressing force is reduced by the upper cylindrical member 77a. Is transmitted to the lower cylindrical member 77b and the pressing bolt 76 by the gap 147, and the auxiliary brake device 125 does not operate. That is, in the present embodiment, the auxiliary brake device 125 is operated only when the sub shift lever 64 is operated to the ultra low speed side.
[0029]
Next, the operation will be briefly described.
[0030]
For example, when the riding rice transplanter 10 enters and exits the field, the aircraft may need to cross over steep ridges, but in such a case, it is necessary to travel the aircraft at high torque, As shown in FIG. 4, the operator operates the auxiliary shift lever 64 in the direction of the arrow to shift to the ultra-low speed position. Then, the shift arm 62 swings clockwise in the figure around the fulcrum shaft 63, the shift rod 65 moves to the left in the figure, and the shift mechanism 67 is shifted to an ultra-low speed by the shift plate 66. . This allows the aircraft to climb steep ridges at very low speed and high torque.
[0031]
At this time, when the sub-transmission lever 64 is shifted to an extremely low speed, the inner wire 142 connected to the auxiliary brake device 125 is pulled in the direction of the arrow in FIG. As a result, as shown in FIG. 6, the control plate 143 rotates in the direction of the arrow (counterclockwise) about the fulcrum shaft 145, and the projecting pin 144 projects in the direction of the arrow in FIG. I do. Therefore, when the clutch pedal 30 is depressed in this state, the depressing force is transmitted from the clutch shaft 56 of FIG. 5 to the L bracket 75 and the upper cylindrical member 77a, and furthermore, the projecting pin 144 and the lower cylindrical member 77a. The auxiliary brake device 125 is operated by being transmitted to the member 77b and the pressing bolt 76.
[0032]
On the other hand, when the sub-transmission lever 64 is operated to a position other than the ultra-low speed, the protruding pin 144 is immersed (separated) from the gap 147, and even if the clutch pedal 30 is depressed in this state, the depressing force is increased. Is not transmitted to the pressing bolt 76 by the gap 147 between the cylindrical member 77a and the lower cylindrical member 77b, and the auxiliary brake device 125 does not operate. That is, the auxiliary brake device 125 is operated only when the sub-shift lever 64 is operated to an extremely low speed.
[0033]
For this reason, when the sub-transmission lever 64 is shifted to the ultra-low speed position when the aircraft is crossed over a ridge or loaded on a truck, high torque traveling is possible and the clutch pedal 30 is required to stop the aircraft midway. Is turned off, the auxiliary brake device 125 is actuated, and a braking force acts on the front wheels 12 and the rear wheels 14. However, during normal traveling, even if the operator depresses the clutch pedal 30, the auxiliary brake device 125 does not operate, so that the aircraft does not stop suddenly.
[0034]
【The invention's effect】
As described above, according to the first aspect of the present invention, the auxiliary brake device arranged on the downstream side of the transmission of the power transmission device and operated based on the depressing operation of the clutch operating tool, and the steep slope by the shift operation means. And an auxiliary brake operating means for operating the auxiliary brake device by operating based on the operation on the high torque traveling side of the vehicle. In addition to the operation of the brake device, even if the operator steps on the clutch operating tool during normal traveling, the auxiliary brake device does not operate, so that it is possible to prevent the aircraft from suddenly stopping.
[0035]
Therefore, during normal traveling other than during high-torque traveling on a steep slope, such as when the aircraft enters and exits a field, and when loading and unloading on a truck, smooth operation can be performed similarly to a general vehicle.
[Brief description of the drawings]
FIG. 1 is a side view of a riding rice transplanter to which the present invention is applied.
FIG. 2 is a plan view of the same.
FIG. 3 is a development view of the internal structure of the mission case.
FIG. 4 is a diagram showing a connection state between a subtransmission lever and a transmission mechanism.
FIG. 5 is a diagram showing a schematic configuration of an auxiliary brake device.
FIG. 6 is a diagram showing a schematic configuration of an auxiliary brake operation means.
[Explanation of symbols]
10 Riding rice transplanter (agricultural work machine)
12 Front wheel (drive wheel)
14. Rear wheel (drive wheel)
16 Traveling body 19 Power transmission device 20 Engine 22 Transmission case 27 Linkage mechanism 29 Clutch 30 Clutch pedal (clutch operating tool)
33 Side brake (braking device)
56 Clutch shaft 60 Relay box 64 Sub-shift lever (shift operation means)
67 Speed change mechanism 122 Traveling PTO shaft 125 Auxiliary brake device 126 Brake shoe 140 Auxiliary brake operating means 144 Protruding pin 147 Air gap

Claims (1)

A power transmission device for transmitting power from the engine to drive wheels via a clutch and a speed change mechanism, a speed change operation means for operating the speed change mechanism to perform a speed change, a brake device for stopping the body running, A clutch operating tool that disconnects and connects and disconnects the power transmission device;
An auxiliary brake device that is disposed on the downstream side of the transmission of the clutch in the power transmission device and that operates based on a depression operation of the clutch operation tool;
Auxiliary brake operating means that operates based on an operation on the high torque running side on a steep slope by the speed change operating means to enable the auxiliary brake device to operate;
An agricultural working machine comprising:

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