JP2545554Y2 - Driving safety devices for work vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for ensuring the safety of a working vehicle such as an agricultural work machine or a civil engineering machine at the start of traveling.

[0002]

2. Description of the Related Art A four-wheeled tractor or track-type work vehicle used for agricultural work, civil engineering work, etc. is generally slow in speed, unlike a normal passenger car, but has a large traction force. As required, the acceleration is very high to increase the peripheral force of the drive wheels. In addition, the traveling speed change mechanism is usually provided with a main speed change lever and an auxiliary speed change lever so that operations such as plowing can be performed smoothly and easily and the vehicle can run on the road. Is possible.

[0003] In addition, in a wheel type tractor and a crawler type tractor, it is necessary to apply a brake to a wheel or a traveling crawler inside a turning tractor for towing or a sharp turn in a work place such as a field. It is operable and configured so that the left and right wheels and left and right traveling crawlers can be braked separately. By the way, even with such a working vehicle, it is necessary to travel on a road like a normal automobile. In this case, in a normal automobile, when one brake pedal is depressed, the braking force acts equally on the left and right wheels, but as described above, it is extremely dangerous to operate the left and right brakes separately. For example, if the driver of the tractor intends to drive a normal car and wants to stop, and only steps on one brake petal, the tractor's acceleration is high as described above, An unexpected accident such as a sudden turn of the vehicle body at the center, a fall of the vehicle body, or a collision with a pedestrian on the side of the vehicle body occurs, which is extremely dangerous.

An object of the present invention is to prevent such an accident from occurring, and to provide a working vehicle that can safely travel on a normal road.

[0005]

In order to achieve the above object, the present invention transmits power from an engine to a traveling device on both left and right sides of a vehicle body via a transmission, and applies braking to the left and right traveling devices. In a working vehicle configured to be braked by a device, a state in which both the left and right operation units are connected so that the left and right braking devices can be integrally operated, and a state in which each of the operation units can be operated. And a detector for detecting the selected position, and a shift position detecting means for detecting a shift position in the transmission. The engine can be started only when it is detected that both operation units are connected.

[0006]

Next, an embodiment of the present invention will be described. Reference numeral 1 denotes front wheels 3, 3 and rear wheels 4,
4 is a four-wheeled tractor equipped with an engine 5 at the front of the vehicle body 2 and transmits its power to right and left rear wheels 4 and 4 via a transmission 6 while protruding rearward from the vehicle body 2. The power can be transmitted to a towing machine (not shown) via the shaft 7.

Reference numeral 8 denotes a control seat, reference numeral 9 denotes a handle for steering the front wheels 3 and 3, reference numeral 10 denotes a main transmission lever for operating the transmission position of the transmission 6, and reference numeral 11 denotes an auxiliary transmission lever. The main speed change lever 10 can be switched between low speed (first speed), medium speed (second speed), medium high speed (third speed), high speed (fourth speed), four forward speeds, a neutral position (neutral), and one reverse speed. . The sub-transmission lever has two stages of L (low) and H (high).

During traveling on the road, the sub-transmission lever 11 is normally set to the H (high) position, and the main transmission lever 10 is shifted to the third or fourth speed position. When a key is inserted into the starter switch 12 provided on the operation panel section 13 and turned by a predetermined angle, the starter motor 14 operates (rotates). Code 36
Is a clutch petal. Figure 3 shows left and right brake petals 1
5A and 5B show a connecting mechanism 5 and 16, wherein a cylindrical body 20 is fixed so as to rotate integrally with a rotating shaft 18 rotatably fitted to a support cylinder 17 via a pin 19 or by spline engagement. Then, the arm 15a of the one (left) brake petal 15 is protruded from the cylindrical body 20. The cylindrical body 2 sandwiching the support cylinder 17
The cylindrical body 21 rotatably fitted to the rotating shaft 18 on the side opposite to the side 0.
Arm 1 on the other (right) brake petal 16
6a is protruded. Bracket 2 protruding from this cylinder 21
2 is connected to an operating rod 23 of a hydraulic system for operating a conventionally known braking device (not shown) such as a drum type for braking the left wheels 3 and 4. A cylindrical body 25 fixed to the rotating shaft 18 with pins 24 or the like is provided adjacent to the cylindrical body 21.
And an operating rod 27 of a hydraulic system for operating a similarly known braking device (not shown).

Reference numeral 28 denotes an actuator for connecting a brake petal such as an electromagnetic solenoid fixed to the cylinder 21.
A bracket 29 with which the engaging pin 30 of the actuator 28 can be engaged is projected from the cylindrical body 25 and
The detector 31 such as a limit switch provided in the above-mentioned is used to determine whether the engagement pin 30 is fitted into the engagement hole of the bracket 29 and the left and right brake petals 15 and 16 are integrally rotated. No can be detected. In other words, the actuator 28 is in a state in which the brake petals 15 and 16 as the left and right operation parts are connected so that the left and right braking devices can be operated integrally, and the actuator 28 can be operated for each of the brake petals 15 and 16 This is a means for selecting the state in which The detector 31 detects the protruding / retracted state of the engagement pin 30 and detects the position selected by the selection means.

FIG. 4 shows a block diagram of an electric circuit of the safety means at the start of traveling. Reference numeral 32 indicates a DC power supply, and reference numeral 3
Reference numeral 33 denotes a shift position detecting means for detecting a shift position in the transmission. Reference numeral 33 denotes a main lever switch that detects when the main shift lever 10 is shifted to a third or fourth speed position. Sets the auxiliary transmission lever 11 to H
This is a sub lever switch that is detected when the switch is set to the (high) position. The main lever switch 33, the sub lever switch 34,
The detector 31, the starter switch 12, and the starter motor 14 are connected in series. Thus, when the main lever switch 33 and the sub lever switch 34 are on and the detector 31 is on, turning on the starter switch 12 activates the starter motor 14. In other words,
The engine can be started only when the shift position of the transmission is set to the road traveling shift state and when it is detected that the left and right operation units are in the connected state.

With this configuration, when the tractor driver wants to travel on the road, the main shift lever 10 is shifted to the third or fourth speed position, and the sub shift lever 11 is set to H (high).
, The brake connecting operation switch 35 provided at the operation panel section 13 or the like is turned on to operate the actuator 28, and the left and right brake petals 1 are moved.
5 and 16 are connected, and then the starter switch 12
When the key is inserted and turned by a predetermined angle, the starter motor 1
Since the wheel 4 operates (rotates), if one of the brake petals is depressed during traveling, the left and right wheels are simultaneously braked. Therefore, there is no problem that only one of the wheels is braked as in the related art, and it is possible to safely execute road traveling.

A key is inserted into the starter switch 12 only when the main lever switch 33 and the sub lever switch 34 are turned on and the detector 31 is turned on using a microcomputer instead of the electric circuit. The starter motor 14 may be controlled so as to operate by turning a predetermined angle. When the main lever switch 33 and the sub lever switch 34 are on, the starter switch 1
When the key is inserted into 2 and turned by a predetermined angle, the actuator 2
It is also possible to control the starter motor 14 to operate only when the key 8 is automatically operated and the key is further turned after the connection state is confirmed by the detector 31.

In the embodiment of control of these microcomputers, the main transmission lever 10 (after traveling on the road)
It is preferable to control so that the actuator 28 is locked (restrained) so that the actuator 28 does not operate in reverse (operation in which the engagement pin 30 moves backward) even when the actuator is returned to the neutral position (neutral) or the retracted position. The present invention can be applied not only to a tractor as an agricultural work machine but also to a tractor for civil engineering work, and can be applied not only to a wheel type traveling device but also to a crawler type traveling device.

[0014]

As described above, the working vehicle of the present invention transmits power from the engine to the traveling devices on both the left and right sides of the vehicle body via the transmission, and applies braking to the left and right traveling devices. If the state of each of the left and right operation parts is maintained by the selection means so that both the left and right braking devices can be operated individually, during normal work traveling, For example, it is possible to smoothly perform a predetermined operation such as a sudden turn by operating only one of the braking devices.

[0015] Further, when traveling on the road, the selection means,
The left and right operation units are connected to each other so that the left and right braking devices can be integrally operated, and a selected position is detected by a detector, and a shift position in the transmission is determined by a shift position detection unit. When it is determined that the vehicle is traveling on the road, the engine can be started only when it is detected that the left and right operation units are in the connected state. There is no danger of a sharp turn without shifting, and the vehicle can safely travel on the road.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor.

FIG. 2 is a plan view of a main part.

FIG. 3 is a perspective view of a brake petal unit.

FIG. 4 is a block diagram of an electric circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor 2 Body 3, 3 Front wheel 4, 4 Rear wheel 5 Engine 6 Transmission 9 Handle 10 Main transmission lever 11 Sub transmission lever 12 Starter switch 14 Starter motor 15, 16 Brake petal 28 Actuator 29 Bracket 30 Engagement pin 31 Detector 33 Main lever switch 34 Secondary lever switch 35 Operation switch

Claims (1)

(57) [Scope of request for utility model registration] 1. A work vehicle configured to transmit power from an engine to traveling devices on both right and left sides of a vehicle body via a transmission, and to brake the left and right traveling devices by left and right braking devices. Means for selecting between a state in which the left and right operation units are connected so that the left and right braking devices can be integrally operated and a state in which each of the operation units can be operated, and a detector for detecting the selected position On the other hand, a shift position detecting means for detecting a shift position in the transmission is provided, and when the shift position is set to the road traveling shift state, only when the left and right operating sections are detected to be in the connected state, the engine A driving safety device for a work vehicle, wherein the driving safety device is configured to be startable.