JPH0825992A - Gear shift operation device for agricultural vehicle - Google Patents

Abstract

PURPOSE:To increase safety by preventing high-speed travel at the time of moving backward, regarding an agricultural vehicle. CONSTITUTION:Regarding an agricultural vehicle equipped with a reverser and a multi-stage main transmission between a prime mover and a driving wheel for selecting the rotating direction thereof between forward and backward travel modes, a backward travel detection means 38 to detect a reverse lever 32 as operated to a reverse position (r) is provided, together with a high-speed gear shift prohibition means 39 to prevent a main transmission lever 31 from being shifted to a high-speed position, thereby providing the constitution for preventing the main transmission from being selected at high-speed travel mode, when the lever 32 is shifted to the reverse position (r).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift operating device for agricultural vehicles.

[0002]

2. Description of the Related Art Conventionally, a gear shift operating device for an agricultural vehicle such as a tractor is provided with a multi-speed transmission and a reverser for switching the rotational direction of the drive wheel between forward and reverse between a prime mover section and the drive wheels. There is one in which the forward and reverse speeds can be changed in multiple stages by connecting and interposing.

[0003]

However, when the above-mentioned reverser is in the reverse drive state, if the other-stage transmission is shifted to the high speed side, the vehicle body moves backward at a high speed, which is very dangerous.

[0004]

SUMMARY OF THE INVENTION According to the present invention, an agricultural vehicle having a reverser for switching the rotation direction of a drive wheel between forward and reverse and a multistage main transmission between a prime mover section and a drive wheel. In, the reverse lever is provided with a reverse position detecting means for detecting that the reverse lever is operated to the reverse position and a high speed shift preventing means for preventing the main shift lever from being shifted to the high speed side. When operated to, the gear shift operation device for an agricultural vehicle configured to prevent the gear shift operation of the main transmission to the high speed side is provided.

Further, in the above vehicle, when the reverse lever is operated to the reverse position, the main gear transmission is prevented from shifting to the high speed side and the power transmission mechanism of the power take-out mechanism for taking out the power of the prime mover portion to the outside. It is also characterized in that it is configured to prevent.

[0006]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a tractor b as an agricultural vehicle B equipped with a speed change device A according to the present invention.
Behind the tractor b, via a link mechanism 1 and an elevating mechanism 2, a rotary tiller 7 including a rotary tiller claw 3, a chain case 4, a tail wheel 5, a tiller claw cover 6 and the like.
Are linked.

The tractor b supports front wheels 12 on the left and right sides of the front of the machine frame 10 via front axles 11 so as to be steerably rotatable, and a prime mover section 13 is provided on the front part of the upper surface of the machine frame 10.
The clutch housing is mounted on the rear surface of the prime mover unit 13.
14, a rear wheel as a drive wheel 18 via a rear axle 17 which is provided by connecting the shaft casing 15 and the mission case 16 in series in the above-mentioned order and protruding from the left and right sides of the mission case 16, respectively.
19 is pivotally supported.

A driving section 20 is mounted on the upper rear surface of the machine body frame 10. The driving section 20 has a handle 21 arranged behind the prime mover section 13 and a seat 22 arranged behind it. A guide plate 30 is formed on the front surface of the rear wheel fender 23 so that the main shift lever 31 and the reverse lever 32 are inserted therethrough.

As shown in FIG. 2, the guide plate 30 has a reverse guide hole for inserting the reverse lever 32 leftward.
33 and a main shift guide hole 34 for inserting the main shift lever 31 are formed.

The reverse guide hole 33 has a refraction portion formed at the center to a neutral position (n). The front end of the reverse guide hole 33 is located at the forward position (f) and the rear end is located at the reverse position (r). ) And operating the reverse lever 32 to the forward position (f), the reverser built into the mission case 16 will be in the forward state, and operating the reverse lever 32 to the reverse position (r) will be in the reverse state. .

The main gear shift guide hole 34 has a central portion at a neutral position.
(N) is formed in a substantially H shape, and the first speed is at the left front end.
(I), 2nd speed (II) in the middle left rear, 3rd speed (II) in the left rear
I), 4th speed (IV) on the right front end, 5th speed (V) on the right rear
, The sixth speed (VI) is set at the right rear end portion, and the main transmission in the transmission case 16 is brought into the corresponding shift state by operating the main transmission lever 31 at each of the above shift positions.

Further, power transmission from the power take-out mechanism built in the mission case 16 for taking out power to the outside to the power take-off shaft 35 projectingly provided on the rear surface of the mission case 16 is turned ON.
A power take-out guide hole 37 for inserting the power take-off lever 36 to be turned on / off is additionally provided. The rear end of the power take-out guide hole 37 is at the power take-out position (P) and the front end is at the OFF position (O. )
The power takeoff lever 36 to the power takeoff position.
When operated to (P), power is transmitted to the power take-off shaft 35, and when the power take-off lever 36 is moved to the OFF position (O), the power take-off shaft 35
Power is cut off.

Particularly, in the present invention, the reverse position detecting means 38 for detecting that the reverse lever 32 is operated to the reverse position (r) is provided on the guide plate 30, and the main shift lever 31 is at the high speed side, that is, the fifth position. And a high-speed shift preventing means 39 for preventing the shift to the sixth speed (V) (VI).

The reverse position detecting means 38 includes a reverse guide hole.
33.The micro switch 40 is arranged on the side of the reverse position (r) 33, and the detection rod 41 of the micro switch 40 is moved backward (r).
When the reverse lever 32 is operated to the reverse position (r), the detection rod body 41 comes into contact with the reverse lever 32 so that the micro switch 40 is made conductive.

The high speed shift preventing means 39 has a solenoid 42 arranged on the right side of the front portion of the main shift guide hole 34 of the guide plate 30,
The actuator 43 of the solenoid 42 is extended rearward, and the extended end portion is bent inward to form a blocking portion 44. The blocking portion 44 is formed in the fifth and fifth portions of the main shift guide hole 34. 6th speed
(V) (VI) is projected.

Further, a solenoid 45 having the same structure as that described above is provided on the right side of the front portion of the power output guide hole 37 so that the blocking portion 47 of the actuator 46 projects into the power output guide hole 37. ing.

The above-mentioned actuators 43, 46 are
When the solenoids 42 and 45 are not energized,
44 and 47 are located behind the rear end of each guide hole 34.37, and when energized, the solenoid 42 on the main gear shift guide hole 34 side is located slightly behind the neutral position (N), and the power take-out guide hole
The solenoid 45 on the 37 side is located slightly behind the OFF position (O).

The micro switch 40, the solenoids 42 and 45, the display plate 48, and the main switch 49 are connected in series to the battery 50.

With this configuration, when the main switch 49 is turned on, when the reverse lever 32 is operated to the reverse position (r), the micro switch 40 is brought into conduction and the solenoids 42 and 45 are energized, and the main gear shift is performed. The blocking portion 44 on the guide hole 34 side is located slightly rearward of the neutral position (N) to prevent the main transmission lever 31 from shifting to the 5th and 6th speeds (V) (VI), and at the same time, the power take-out guide. The blocking portion 47 on the hole 37 side is located slightly behind the OFF position (O) to prevent shifting to the power take-off position (P), and the driver is informed of the above state by the display plate 48. be able to.

FIG. 3 shows another embodiment in which a reverse lever 61 is provided on the side of the handle 60 in a protruding manner.
On the upper surface of the grip 62 of 61, a high / low speed changeover switch 63 connected to the auxiliary transmission incorporated in the mission case 16 is arranged,
When the high / low speed changeover switch 63 is switched to high speed (H), the auxiliary transmission is electromagnetically changed to the high speed side, and when the high / low speed changeover switch 63 is changed to low speed (L), the auxiliary transmission is electromagnetically changed to the low speed side. In this way, the operation was simplified.

FIG. 4 shows a steering control device 70 provided for simplifying the U-turn operation in a headland or the like, and a controller 72 connected to a power steering mechanism 71.
In addition, a clutch state detection switch 73 for detecting ON / OFF of the clutch, a reverse detection switch 74 provided on the reverser for detecting the reverse state, a display panel 75, a backup switch 76, and a battery 77 are connected in series. Then, if the backup switch 76 is turned on prior to the U-turn operation, the reverser is operated and the clutch is turned on.
Then, the power steering mechanism 71 steers the front wheels 78 in the opposite direction of the turning direction of the U-turn, and the display panel 75 indicates this fact.
In this case, the driver is notified.

5A to 5E show the operation of the steering control device 70, that is, the steering of the front wheels 78 and the U of the vehicle 79.
The process of turning turns is shown. When the vehicle 79 reaches the end of the field (a), the driver turns off the clutch, turns on the backup switch 76, operates the reverser to reverse, and then turns on the clutch. Then, the vehicle 79 starts moving backward, but at the same time, the output from the controller 72 automatically activates the power steering mechanism 71 to steer the front wheels 78 to the left (b), and in this state, the vehicle moves backward. The vehicle 79 is turned to the right (C).

After that, when the driver turns off the clutch, turns off the backup switch 76, operates the reverser to move forward, and then turns on the clutch, the vehicle 79 starts moving forward. At the same time, the driver turns the steering wheel. When the vehicle is turned to the right, the front wheel 78 is steered to the right through the straight attitude (d), and the vehicle 79 moves forward to make a right turn U-turn (e).

As described above, since the reverse steering wheel operation at the beginning of the U-turn can be omitted, the operation of the vehicle 79 can be simplified.

[0026]

According to the present invention, in an agricultural vehicle provided with a multi-stage main transmission and a reverser for switching the rotation direction of the drive wheel between forward and reverse, between the prime mover section and the drive wheel, The reverse lever is operated to the reverse position by providing reverse position detecting means for detecting that the reverse lever has been operated to the reverse position and high-speed shift preventing means for preventing the main shift lever from being shifted to the high speed side. When
By configuring the main transmission to prevent shifting to the high speed side, the main transmission is not shifted to the high speed side when the reverser is in the reverse state, so high speed running in reverse is prevented and safety is improved. There is an effect of doing.

The present invention also provides a gear shift operating device for an agricultural vehicle.

Further, in the above-mentioned vehicle, when the reverse lever is operated to the reverse position, the operation of shifting the main transmission to the high speed side is prevented and the power transmission operation of the power take-out mechanism for taking out the power of the prime mover portion to the outside. By configuring so as to prevent the power consumption, it is possible to meaninglessly transmit the power to the outside and waste the power when the vehicle is moving backward, and it is possible to prevent a malfunction caused by this.

[Brief description of drawings]

FIG. 1 is an overall side view of an agricultural vehicle equipped with a gear shift operation device according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a reverse position detecting means and a high speed side shift preventing means.

FIG. 3 is a plan view of a reverse lever according to another embodiment.

FIG. 4 is an explanatory diagram showing a configuration of a steering control device.

FIG. 5 is an operation explanatory view showing the operation of the steering control device and the result thereof.

[Explanation of symbols]

 B Agricultural vehicle r Reverse position 13 Motor part 18 Drive wheel 31 Main shift lever 32 Reverse lever 38 Reverse position detection means 39 High speed side shift prevention means

Claims (2)

[Claims] 1. Between the prime mover section (13) and the drive wheels (18),
In the agricultural vehicle B provided with a multi-stage main transmission and a reverser that switches the rotation direction of the drive wheel (18) between forward and reverse, check that the reverse lever (32) has been operated to the reverse position (r). Reverse position detecting means (38) for detecting, and high speed shift preventing means for preventing the main speed change lever (31) from being shifted to the high speed side.
(39) is provided, and when the reverse lever (32) is operated to the reverse position (r), it is configured to prevent the main transmission from shifting to the high speed side. . 2. Between the prime mover section (13) and the drive wheels (18),
In the agricultural vehicle B provided with a multi-stage main transmission and a reverser that switches the rotation direction of the drive wheel (18) between forward and reverse, check that the reverse lever (32) has been operated to the reverse position (r). Reverse position detecting means (38) for detecting, and high speed shift preventing means for preventing the main speed change lever (31) from being shifted to the high speed side.
(39) is provided, and when the reverse lever (32) is operated to the reverse position (r), it prevents the main transmission from shifting to the high speed side, and the power of the prime mover section (13) to the outside. A gear shift operation device for an agricultural vehicle configured to prevent a power transmission operation of a power extraction mechanism.