JP2012228957A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compactly arrange right and left brake coupling means on the rear side of long step parts in right and left directions of right and left brake pedals in a working vehicle keeping the right and left brake pedals arranged right and left in parallel.SOLUTION: The working vehicle, which keeps the right and left brake pedals separately pivotally supported around shafts of the right and left directions on a travelling vehicle body, a locking coupling body attached on the rear side of one long step part in the right and left directions on the right and left brake pedals, a brake coupling solenoid attached on the rear side of the other long step part in the right and left directions, composes cylindrical bodies matching the brake coupling solenoid along the right and left directions, a fixed coil and a movable coil arranged in the cylindrical body, solenoid coupling pins movably arranged on the cylindrical body in the right and left directions and attaching the movable coil, and return springs returnably moving the solenoid coupling pins.

Description

  The present invention relates to a work vehicle, and relates to a left / right brake connection release device.

  A turn detector linked to the steering system, a low speed state where the peripheral speed of the front wheels is substantially equal to the peripheral speed of the rear wheels, and the peripheral speed of the front wheels more than the peripheral speed of the rear wheels in conjunction with the turn detector during turning A tractor equipped with a high / low speed switching device that switches between a high speed state and a high speed state, and a pair of left and right brake pedals that operate the left and right rear wheel brakes can be freely disconnected. It is well known to provide a connection detector for preventing the high / low speed switching device from switching to a high speed state, and to ensure safety on the road (Patent Document 1).

JP-A-9-104249

  In a work vehicle in which left and right brake pedals are arranged side by side in parallel, the present invention effectively uses a stepping portion that is long in the left and right direction of the left and right brake pedals, and arranges the left and right brake connection release means in a compact manner. It automatically secures the connection of the left and right brakes at the time and tries to ensure safety on the road.

  In the first aspect of the invention, the left and right brake pedals (21, 21) are separately pivotally supported around the left and right axis (21b) on the traveling vehicle body, and the left and right brake pedals (21, 21) A locking coupling body (22) is attached to the back side of one foot part (21a) that is long in the left-right direction, and a brake connection solenoid (23) is attached to the back side of the other foot part (21a) that is long in the left-right direction. The solenoid (23) is movable in the left-right direction to the cylindrical body (23a) along the left-right direction, the fixed coil and the movable coil disposed in the cylindrical body (23a), and the cylindrical body (23a). And a return spring for moving the solenoid connection pin (23b) back. The work vehicle has a solenoid connection pin (23b) with a movable coil attached thereto.

  The invention of claim 2 provides the left and right brake connection switch (SW1) in the invention of claim 1, turns on the left and right brake connection switch (SW1), and energizes the fixed coil of the brake connection solenoid (23). The work vehicle is characterized in that the fixed coil is excited and the solenoid coupling pin (23b) to which the movable coil is attached is moved to the retracting side so that the left and right brakes are disconnected.

  According to a third aspect of the present invention, in the first and second aspects of the present invention, when the brake connection solenoid (23) is operated in a non-connected state of the left and right brakes, the brake connection solenoid is activated after a predetermined time has elapsed. A work vehicle is characterized in that a controller (26) for switching (23) to the connected state of the left and right brakes is provided.

  According to a fourth aspect of the present invention, in the first to third aspects of the present invention, a vehicle body front / rear inclination adjustment means or a right / left inclination adjustment means is provided, a front / rear inclination sensor (SE1) or a right / left inclination sensor (SE2) is provided, and the brake When the connecting solenoid (23) is operating in a state where the left and right brakes are not connected, when the front / rear tilt sensor (SE1) or the left / right tilt sensor (SE2) detects a tilt of a predetermined angle or more, the brake connecting solenoid (23 ) To the connected state of the left and right brakes is added to the controller (26).

  According to a fifth aspect of the present invention, there is provided brake connection release means (31) for pivotally supporting the left and right brake pedals (21, 21) separately so as to be pivotable and releasing the connection between the left and right brake pedals (21, 21). The brake connection actuator (28) for releasing the connection of the brake connection release means (31) is provided, the left and right brake connection switch (SW1) for releasing the connection of the brake connection release means (31), and the left and right brake connection automatic on / off switch (SW2). ) And front wheel acceleration turning control automatic on / off switch (SW3), the left and right brake connection automatic on / off switch (SW2) is automatically turned on, and the left and right brake connection switch (SW1) is turned off. When in the released state and the front wheel acceleration turning control automatic on / off switch (SW3) is automatically turned off, the brake connection release actuator A work vehicle, characterized in that over data (28) provided with a controller (26) to the connection state of the left and right brakes.

  According to the first aspect of the present invention, the locking connecting body (22) is attached to the back side of one stepping portion (21a) that is long in the left-right direction in the left and right brake pedals (21, 21), and the other stepping portion that is long in the left-right direction. A brake coupling solenoid (23) is attached to the back side of (21a), the brake coupling solenoid (23) is disposed in the tubular body (23a) along the left-right direction, and the fixed coil disposed in the tubular body (23a). And a movable coil, a solenoid coupling pin (23b) that is mounted on the cylindrical body (23a) so as to be movable in the left-right direction, and a return spring that moves the solenoid coupling pin (23b) back. Since the brake connecting solenoid (23) is energized or stopped, the solenoid connecting pin (23b) is moved in a projecting or retracting manner to move the left and right blocks. It can be a connected state or a non-coupled state over key.

  In addition, since the brake coupling solenoid (23) is disposed on the back surface of the stepped portion (21a) that is long in the left-right direction of the left and right brake pedals (21), it is easy to secure a mounting space and the stepped portion that is long in the left-right direction. The brake connection solenoid (23) can be hidden by (21a), so that the appearance can be improved and the structure can be made compact. In addition, since the stepping force of the left and right brake pedals (21, 21) acts in a direction perpendicular to the longitudinal direction of the brake connecting pin (23b), the operating load is reduced and the durability of the brake connecting solenoid (23) is increased. Can be increased.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, when the left and right brake connection switch (SW1) is turned on and the fixed coil of the brake connection solenoid (23) is energized, the fixed coil is excited. Since the solenoid coupling pin (23b) to which the movable coil is attached is moved to the retracted side so that the left and right brakes are not connected, the left and right brakes can be operated by turning on the left and right brake connection switch (SW1) according to the operator's will. Can be in a disconnected state, and malfunction can be prevented. Further, in a work vehicle, it is normal that the usage time is large in the connected state of the left and right brakes, and the usage time is small in the disconnected state. ) Is energized to retract the solenoid connecting pin (23b), so that the power consumption of the battery can be reduced and energy saving operation can be performed.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2 or claim 2, when the brake connection solenoid (23) is operating in the non-connected state of the left and right brakes, Since the controller (26) for switching the brake connection solenoid (23) to the connected state of the left and right brakes is provided, the brake connection solenoid (23) is in the disconnected state of the left and right brakes when the work vehicle is traveling outside the field. However, when a predetermined time elapses, the left and right brakes can be automatically changed to a connected state, and a trouble due to forgetting to switch the left and right brake connection switch (SW1) can be avoided and the vehicle can travel safely on the road.

  According to the invention of claim 4, in addition to the effects of the inventions of claims 1 to 3, when the front / rear tilt sensor (SE1) or the left / right tilt sensor (SE2) detects a tilt of a predetermined angle or more, the brake connection solenoid Since the function of switching (23) to the connected state of the left and right brakes is added to the controller (26), even if the brake connecting solenoid (23) is operated to the disconnected state of the left and right brakes, When the forward / backward tilt sensor (SE1) or the left / right tilt sensor (SE2) detects a tilt of a predetermined angle or more during traveling, the brake coupling solenoid (23) can be automatically switched to the coupled state of the left and right brakes. Even if the switching operation of (SW1) is forgotten, the vehicle can travel safely on the road.

  According to the invention of claim 5, the left and right brake connection automatic on / off switch (SW2) is in the automatic on state, the left and right brake connection switch (SW1) is off and in the disconnected state, and the front wheel acceleration turning control automatic on / off switch. When (SW3) is automatically turned off, the brake connection release actuator (28) can be connected to the left and right brakes, eliminating the disconnected state of the left and right brakes when traveling on the road, and ensuring safety on the road. it can.

It is a side view of the whole tractor. It is a top view of the whole tractor. It is a side view of the mission case part of a tractor. It is a top view of the mission case part of a tractor. It is a figure which shows the back surface side of the step part of a right-and-left brake pedal, and a side view of a step part. It is a control block diagram and a circuit diagram of the left and right brake connection switch. It is a control block diagram. It is a flowchart. It is a flowchart. It is a flowchart. It is a flowchart. It is a flowchart. It is a flowchart. It is a flowchart. It is a flowchart. It is a control block diagram. It is a block diagram which shows the connection structure of a left-right brake pedal. It is a top view of the front-back direction intermediate part of a tractor. It is the side view and top view of a mission case part. It is the side view and top view of a brake connection solenoid. It is the perspective view of a connection structure of a left-right brake pedal, and a cutting | disconnection top view. It is a figure which shows the back surface side of the step part of a right-and-left brake pedal, and a control block diagram.

Hereinafter, an embodiment in which the present invention is applied to an agricultural tractor will be described with reference to the drawings.
First, the whole structure of the agricultural tractor provided with this invention is demonstrated based on FIG.1 and FIG.2.

  The tractor has an engine E (not shown) mounted on the front side of the traveling vehicle body 1, the engine E is covered with the bonnet 2, and the rotational power from the engine E is supplied to the hydraulic continuously variable transmission and the gear-type auxiliary in the transmission case 3. The gear is shifted by a transmission and transmitted to the left and right front wheels 4 and 4 and the left and right rear wheels 5 and 5.

  Further, a seat 6 is provided on the upper rear side of the mission case 3, and left and right fenders 7 and 7 are provided on the left and right sides thereof. In addition, a cylinder case 8 is provided on the rear side of the traveling vehicle body 1, and left and right lift arms 9, 9 are provided on the rear side portion of the cylinder case 8 so as to be rotatable up and down, and are connected by a three-point link mechanism 10. Are connected so as to be movable up and down.

  A handle frame 15 is erected on the rear side of the engine E, and a steering handle 16 is provided on the handle frame 15. A rear safety frame 19 is erected on the rear portion of the traveling vehicle body 1.

Next, the structure for releasing the connection of the left and right rear wheel brakes will be described with reference to FIGS.
In the transmission case 3, left and right brake pedals 21 and 21 are pivotally supported separately around a left and right axis 21b so that the left and right brake pedals 21 and 21 have foot portions 21a, Brake connection release means is provided on the back side of 21a. The brake connection release means includes a locking connection body 22 attached to the back surface of one foot portion 21a, and a brake connection solenoid 23 attached to the back surface of the other foot portion 21a.

  The brake coupling solenoid 23 is provided in a cylindrical body 23a extending in the left-right direction, a fixed coil and a movable coil disposed in the cylindrical body 23a, and movably mounted in the cylindrical body 23a in the left-right direction. The solenoid connecting pin 23b to which the movable coil is attached and the return spring for returning the solenoid connecting pin 23b to the retracted side.

  Accordingly, the solenoid connecting pin 23b protrudes from one side of the cylindrical body 23a to the other side and engages with the locking connecting body 22, and the left and right brake pedals 21 and 21 are connected, or the solenoid connecting pin 23b Is retracted and disengaged from the locking connection body 22, and the left and right brake pedals 21, 21 are configured to be in an unconnected state.

  Further, as shown in FIG. 6A, the left and right brake connection switch SW1 is connected to the input side of the controller 26, and the brake connection solenoid 23 is connected to the output side of the controller 26 via the driving means. The left and right brake connection switch SW1 may be provided in an energization circuit from a battery as shown in FIG. 6 (B).

  Accordingly, when the left and right brake connection switch SW1 is turned on and the fixed coil of the brake connection solenoid 23 is energized, the fixed coil is excited and the solenoid connection pin 23b to which the movable coil is attached is attracted and retracted against the return spring. The left and right brake pedals 21 and 21 are in a non-connected state.

  Further, when the left and right brake connection switch SW1 is turned off, the energization to the fixed coil of the brake connection solenoid 23 is stopped, the fixed coil is demagnetized, and the attraction force of the solenoid connection pin 23b to which the movable coil is attached disappears. The pin 23b is protruded and moved to the left and right other sides by the return spring, and the left and right brake pedals 21 and 21 are connected.

  According to the above-described configuration, the brake connection solenoid 22 and the brake connection solenoid 23 are disposed on the rear surfaces of the left and right stepping portions 21a and 21a above the left and right brake pedals 21 and 21. It becomes easy to secure the installation space for the release means, and when the left and right brake pedals 21 and 21 are not depressed, maintenance work is easy because they are located away from the floor, and the brake connection is released by the foot depressions 21a and 21a. Means are hidden and good-looking and compact. Further, since the depressing operation force of the left and right brake pedals 21 and 21 acts in a direction perpendicular to the longitudinal direction of the brake connecting pin 23b, the brake connecting solenoid 23 operates integrally while reducing the operating load, and the durability of the brake connecting solenoid 23 is reduced. Can be increased.

  Further, when the left and right brake connection switch SW1 is turned on and the fixed coil of the brake connection solenoid 23 is energized, the solenoid connection pin 23b to which the movable coil is attached moves to the retracting side, and the left and right brake pedals 21 and 21 are not connected. Further, when the left and right brake connection switch SW1 is turned off, the energization to the fixed coil of the brake connection solenoid 23 is stopped, and the brake connection pin 23b is projected and moved by the action of the return spring, so that the left and right brake pedal 21 , 21 can be in the connected operation state, and the left and right brake pedals 21 and 21 can be disconnected by turning on the left and right brake connection switch SW1 at the will of the operator, preventing malfunction and driving on the road. Time safety can be achieved. Further, in the tractor, it is normal that the left and right brakes are used in a connected state with a lot of time and the used time in a non-connected state is short, and the brake connecting solenoid 23 is energized in a non-connected state with a short use time. By doing so, the power consumption of the battery can be reduced and energy saving operation can be performed.

  Further, when the left and right brake connection switch SW1 is operated in a non-connected state of the left and right brakes, a timer operation state for a predetermined time is set by a command from the controller 26, and when the predetermined time count of the timer count means ends, May be output and the left and right brake connection switch SW1 may be turned off, or energization of the brake connection solenoid 23 may be stopped to return to the left and right brake connection state.

  According to the above configuration, when the tractor is in the off-farm running state, the left and right brake connection switch SW1 is turned on and the left and right brakes are not connected. It can be changed, and it is safe to prevent forgetting to operate the left and right brake connection switch SW1.

  Further, in the tractor provided with the vehicle body front / rear tilt adjusting means or the left / right tilt adjusting means, and provided with the front / rear tilt sensor (SE1) or the left / right tilt sensor (SE2), the left / right brake connection switch SW1 is operated in a disconnected state of the left / right brake. If the forward / backward inclination sensor SE1 and the left / right inclination sensor SE2 detect an inclination of a predetermined angle or more, it is determined that the vehicle travels on the road from the field, and a left / right brake connection command is output from the controller 26 to connect the brake. The energization of the solenoid 23 may be stopped to return to the connected state of the left and right brakes.

  According to the above configuration, when the tractor travels at a predetermined angle or more and travels outside the field, the left and right brake connection switch SW1 is turned on and the left and right brakes are automatically connected even when the left and right brakes are not connected. It can be changed, and it is safe to prevent forgetting to operate the left and right brake connection switch SW1.

Next, another embodiment will be described with reference to FIGS.
Brake connection release motor having left and right brake connection switch SW1, and having left and right brake connection automatic on / off switch SW2 and front wheel acceleration turning control automatic on / off switch SW3, and operating the connection release means of left and right brake pedals 21 and 21 In a tractor having a front wheel acceleration turning control means that has an actuator such as 28 and increases the circumferential speed of the front wheel more than the circumferential speed of the rear wheel at the time of turning, When the left and right brake connection switch SW1 is turned off, the left and right brakes are not connected, and the front wheel acceleration turning control automatic on / off switch SW3 is automatically turned off, the brake connection actuator is operated by a command from the controller 26 to connect the left and right brakes. The release means is activated to connect the left and right brakes. FIG. 8 shows the control flowchart.

  According to the above configuration, when the left and right brake connection automatic on / off switch SW2 is automatically turned on, the left and right brake connection switch SW1 is turned off and the left and right brakes are not connected, and the front wheel acceleration turning control automatic on / off switch SW3 is automatically turned off. In this case, it is determined that the vehicle is in a non-working state, and the brake connecting actuator is operated to set the left and right brakes in a connected state.

Next, another embodiment will be described with reference to FIG.
Brake having a left / right brake connection switch SW1, a left / right brake connection automatic on / off switch SW2, a travel mode switching switch SW4 for switching between road travel and field travel, and a brake for operating the connection release means of the left and right brake pedals 21, 21 In a tractor having an actuator such as the connection release motor 28, the left and right brake connection automatic on / off switch SW2 is in the automatic on state, the left and right brake connection switch SW1 is in the non-connected state, and the travel mode switch SW4 is in the on-road travel operation state. In this case, the actuator is operated in accordance with a command from the controller 26 to operate the brake connection release means so that the left and right brake pedals 21 and 21 are connected. FIG. 9 shows a control flowchart.

  According to the above configuration, when the left / right brake connection automatic on / off switch SW2 is in the automatic on state, the left / right brake connection switch SW1 is in the non-connected state, and the travel mode switch SW4 is in the road travel operation state, Since the dulls 21 and 21 are automatically connected to each other, the independent braking state of the left and right brakes can be prevented when traveling on the road, which is safe.

Next, another embodiment will be described with reference to FIG.
Brake connection that has a left / right brake connection switch SW1, a left / right brake connection automatic on / off switch SW2, and a PTO detection sensor SE5 for detecting transmission on / off of the PTO shaft, and operates the connection release means of the left and right brake pedals 21, 21 In a tractor having an actuator such as a release motor 28, the left and right brake connection automatic on / off switch SW2 is in the automatic on state, the left and right brake connection switch SW1 is in the non-connected state, and the PTO detection sensor SE5 is in the neutral position operating state. Is detected, the actuator is operated in accordance with a command from the controller 26 to operate the connection release means so that the left and right brake pedals 21 and 21 are connected. FIG. 10 shows a control flowchart.

  According to the above configuration, when the left / right brake connection automatic on / off switch SW2 is in the automatic on state, the left / right brake connection switch SW1 is in the non-connected state, and the PTO detection sensor SE5 is not in the PTO operation, the left / right brake pedal 21 , 21 can be automatically connected to each other, and independent braking of the left and right brakes can be prevented when traveling on the road, which is safe.

Next, another embodiment will be described with reference to FIG.
It has a left and right brake connection switch SW1, a left and right brake connection automatic on / off switch SW2, a sub shift position detection sensor SE6 for detecting a shift operation position of the sub transmission, and a connection release means for the left and right brake pedals 21 and 21. In a tractor having an actuator such as a brake connection release motor 28 that operates, the left and right brake connection automatic on / off switch SW2 is in an automatic on state, the left and right brake connection switch SW1 is in an unconnected state, and the sub-shift position detection sensor SE6 is at high speed. When the shift position is detected, it is determined that the vehicle is traveling on the road, and the actuator is operated by a command from the controller 26 to operate the connection release means so that the left and right brake pedals 21 and 21 are connected. ing. FIG. 11 shows a control flowchart.

  According to the above configuration, when the left / right brake connection automatic on / off switch SW2 is in the automatic on state, the left / right brake connection switch SW1 is in the off / non-connected state, and the sub shift position detection sensor SE6 detects the high speed shift position. The left and right brake pedals 21 and 21 can be automatically connected to each other, and independent braking of the left and right brakes can be prevented when traveling on the road.

Next, another embodiment will be described with reference to FIG.
A brake connection release motor 28 having a left / right brake connection switch SW1, a left / right brake connection automatic on / off switch SW2, and a front wheel acceleration turning control on / off switch SW5, which operates the connection release means of the left and right brake pedals 21, 21 In the tractor having the left and right brakes, the left and right brake connection automatic on / off switch SW2 is automatically turned on, the left and right brake connection switch SW1 is off and the front wheel acceleration turning control on / off switch SW5 is turned off. In the case of the fast turning state, the actuator is operated while sounding the buzzer according to a command from the controller 26 to operate the connection release means, and the left and right brake pedals 21 and 21 are connected. FIG. 12 shows a control flowchart.

  According to the above configuration, the front / rear brake connected automatic on / off switch SW2 is automatically turned on, the left / right brake connected switch SW1 is turned off, and the front wheel accelerated turning control on / off switch SW5 is turned off. In the state, the left and right brake pedals 21 and 21 can be automatically connected to each other while sounding the buzzer, and the left and right brake pedals 21 and 21 can be prevented from being independently braked when traveling on the road.

Next, another embodiment will be described based on FIG.
It has a left / right brake connection switch SW1, a left / right brake connection automatic on / off switch SW2, and a travel mode switching switch SW4, and an actuator such as a brake connection release motor 28 for operating the connection release means of the left and right brake pedals 21 and 21. In the tractor, when the left and right brake connection switch SW1 is in the disconnected and disconnected state, the left and right brake connection automatic on / off switch SW2 is in the automatically turned on state, and the traveling mode switch SW4 is in the on-road traveling switching state, While the buzzer is sounding, the actuator is operated to operate the connection release means so that the left and right brake pedals 21 and 21 are connected. FIG. 13 shows a control flowchart.

  According to the above configuration, the buzzer sounds when the left and right brake connection switch SW1 is in the disconnected and disconnected state, the left and right brake connection automatic on / off switch SW2 is in the automatically turned on state, and the traveling mode switch SW4 is in the on-road traveling switching state. However, since the left and right brake pedals 21 and 21 are automatically connected to each other, the left and right brake pedals 21 and 21 can be prevented from braking independently when traveling on the road.

Next, another embodiment will be described with reference to FIG.
Brake connection that has a left / right brake connection switch SW1, a left / right brake connection automatic on / off switch SW2, and a PTO detection sensor SE5 for detecting transmission on / off of the PTO shaft, and operates the connection release means of the left and right brake pedals 21, 21 In a tractor having an actuator such as a release motor 28, the left and right brake connection switch SW1 is in a non-connected state, the left and right brake connection automatic on / off switch SW2 is in an automatic state, and the PTO detection sensor SE5 is in a neutral position PTO cut state. If it is detected, the actuator is operated to operate the connection release means while sounding the buzzer according to the command of the controller 26, and the left and right brake pedals 21, 21 are connected. FIG. 14 shows a control flowchart.

  According to the above configuration, when the left and right brake connection switch SW1 is in the disconnected and disconnected state, the left and right brake connection automatic on / off switch SW2 is in the automatically turned on state, and the PTO detection sensor SE5 is turned off, the right and left brakes are sounded. Since the pedals 21 and 21 are automatically connected to each other, it is possible to prevent independent braking of the left and right brakes when traveling on the road while increasing operator switching recognition.

Next, another embodiment will be described with reference to FIG.
It has a left and right brake connection switch SW1, a left and right brake connection automatic on / off switch SW2, and a sub shift position detection sensor SE6 for detecting the shift operation position of the sub transmission, and operates the connection release means of the left and right brake pedals 21 and 21. In a tractor having an actuator such as a brake connection release motor 28 to be operated, the left and right brake connection switch SW1 is in an unconnected state, the left and right brake connection automatic on / off switch SW2 is in an automatic state, and the sub-shift position detection sensor SE6 is at a high speed. When the position is detected, it is determined that the vehicle is traveling on the road, and the actuator is operated while the buzzer is sounded according to a command from the controller 26 to operate the connection release means, and the left and right brake pedals 21 and 21 are connected. Like to do. FIG. 15 shows a control flowchart.

  According to the above configuration, when the left and right brake connection switch SW1 is in the disconnected and disconnected state, the left and right brake connection automatic on / off switch SW2 is in the automatically turned on state, and the sub shift position detection sensor SE6 detects the high speed shift position. Since the left and right brake pedals 21 and 21 are automatically connected to each other while sounding the buzzer, independent braking of the left and right brakes can be prevented while raising the operator's switching recognition when traveling on the road.

Next, another embodiment will be described based on FIGS. 3 to 5 and FIG.
In the transmission case 3, left and right brake pedals 21 and 21 are pivotally supported separately around a left and right axis 21b, and are placed on the back side of the stepped portions 21a and 21a which are long in the left and right direction of the left and right brake pedals 21 and 21, respectively. Brake connection solenoid 26 is provided, and left and right brakes are connected so that they can be operated simultaneously or independently. Left and right brake connection switch SW1 is provided. When the switch is turned on, it becomes an independent operation state. It is configured to be.

  The operation position of the sub-transmission lever for operating the sub-transmission device is detected by the sub-transmission position detection sensor SE6 as a high-speed transmission state, and the brake connection solenoid 26 is in the non-connection operation state in which the left and right brake connection switch SW1 is turned on. In the connected state, a buzzer is sounded and an alarm is given to prevent forgetting to connect the left and right brakes when traveling on the road.

  In addition, the left and right brakes are connected only when the operation position of the sub shift lever is detected by the sub shift position detection sensor SE6 and the left and right brake connection switch SW1 is turned on and the left and right brakes are not connected. You may comprise so that may be cancelled | released.

  Further, the rotary tiller 11 is connected to the rear part of the machine body so as to be able to move up and down, and a simple work machine elevating lever is provided in the vicinity of the steering handle 16. Is configured to lower the rotary tiller 11 by a predetermined amount when the lever is slightly lowered, and a simple lift lever operation position detection sensor SE7 for detecting the operation position of the simple work implement lift lever is provided. In the provided tractor, when the simple lift lever operation position detection sensor SE7 detects the lift operation of the simple work implement lift lever, it is determined that the work in the field is being performed, and the left and right brakes are disconnected for a predetermined time, When the predetermined time is over, the left and right brakes are returned to the connected state to ensure safety while driving on the road. There.

  Further, the rotary tiller 11 is connected to the rear part of the machine so as to be lifted and provided with a work implement lifting detection sensor SE8 for detecting the lift position of the rotary tiller 11 to set heavy work and other light work of the tilling work. When the work selector switch SW6 is switched to a light work other than tilling work and the work implement lifting detection sensor SE8 detects a rise above a predetermined height of the work implement. The left and right brakes may be returned from the non-connected state to the connected state to ensure safety while traveling on the road.

  Further, when the left / right brake connection switch SW1 is not connected to the left / right brake and the work changeover switch SW6 is switched to road driving, the buzzer is sounded while blinking the warning light on the monitor display screen, and in this state for a predetermined time. When (for example, 5 seconds) elapses, the engine stop means may be operated to stop the engine, and the traveling in the disconnected state of the left and right brakes during traveling on the road may be stopped to ensure safety.

  Further, the rotary tiller 11 is connected to the rear part of the machine so as to be lifted and provided with a work implement lifting detection sensor SE8 for detecting the lift position of the rotary tiller 11 to set heavy work and other light work of the tilling work. In the tractor provided with the work changeover switch SW6 and the vehicle speed sensor SE9, the work changeover switch SW6 is switched to a light work other than the tilling work, and the work implement elevating detection sensor SE8 is a predetermined value of the work implement. When the above increase is detected and the vehicle speed sensor SE9 detects traveling, the brake coupling solenoid 23 is operated to return from the uncoupled state of the left and right brakes to prevent the left and right brakes from being uncoupled. Safety may be ensured.

Next, another embodiment of the connection release structure of the left and right brake pedals 21 and 21 will be described with reference to FIG.
The left and right brake pedals 21 and 21 are pivotally supported separately around the left and right axis 21b, and the brake connection is released on the back side of one of the long foot portions 21a and 21a of the left and right brake pedals 21 and 21. The means 31 is pivotally supported. When the arm portion of the throttle lever 32 for adjusting the fuel injection amount of the engine and the brake connection release means 31 are connected via the wire cable 33, and the throttle lever 31 is operated from the intermediate adjustment position to the speed increasing side, the brake connection is established. When the release means 31 is operated to the release side and operated to the deceleration side, the brake connection release means 31 is configured to be connected to the left and right brakes by a return spring.

  According to the above configuration, when the throttle lever 31 is operated to the speed increasing side according to the work load when working on the field, the brake connection release means 31 is released, and the left and right brake pedals 21 and 21 are individually operated to make a turning run. You can work while smoothing. Further, when the throttle lever 31 is operated to the deceleration side in accordance with the traveling load when traveling on the road, the brake connection release means 31 returns to the connected state of the left and right brakes, and the road connection can be safely performed while preventing forgetting to operate the brake connection release means 31. Can do.

Next, another embodiment of the connection release structure of the left and right brake pedals 21 and 21 will be described with reference to FIGS.
The left and right brake pedals 21 and 21 are pivotally supported separately on the right side of the floor 36 about the left and right axis, and the brake connection release means 31 is provided between the brake arms of the left and right brake pedals 21 and 21. It is configured to be switchable between a connected state of the left and right brakes or a disconnected state of the left and right brakes. A clutch pedal 37 is provided on the left front part of the floor 36 of the tractor, the main clutch provided between the engine and the transmission case 3 is turned on and off, and a brake connection release pedal 38 is provided near the left fender 7 on the left rear part. It is arranged.

  The brake connection release means 31 is attached to one of the left and right brake pedals 21 and 21, and the brake connection release pedal 38 and the brake connection release means 31 are connected by a wire cable 39. When the brake connection release pedal 38 is stepped on, the connection pin 31c of the brake connection release means 31 is disengaged from the engaging portion of the other left and right brake pedals 21 and 21, and the left and right brake pedals 21 and 21 are not connected. It is comprised so that. The wire cable 39 is routed below the floor 36 and above the mission case 3.

  According to the above configuration, the left and right brakes can be disconnected by a simple operation of depressing the brake connection release pedal 38. In addition, the left and right brake pedals 21 and 21 are arranged on the right side of the floor 36, and the brake connection release pedal 38 is arranged on the left side, so that the brake connection is released while operating the left and right brake pedals 21 and 21. The pedal 38 can be operated, and the left and right brakes can be quickly disconnected. In addition, since the clutch pedal 37 is disposed at the left front portion of the floor 36 and the brake connection release pedal 38 is disposed at the left rear portion, the left and right brakes are prevented from being operated incorrectly with the clutch pedal 37. The connection can be released smoothly.

Next, a specific configuration of the brake connection release means 31 will be described with reference to FIGS.
The left and right brake pedals 21 and 21 are pivotally supported on the right side of the transmission case 3, and a U-shaped base plate 31a is attached to the left brake pedal 21, and a support cylinder 31b is mounted in the recess of the base plate 31a. Are fixed along the left-right direction, and the brake connecting pin 31c is fitted to the support cylinder 31b so as to be movable in the left-right direction. The proximal end side of the wire cable 39 is pin-connected to the brake connection pedal 38, and the distal end side of the wire cable 39 is connected to the left end portion of the brake connection pin 31c. In addition, the right end of the brake connecting pin 31c protrudes rightward from the right bent portion of the base plate 31a and enters the hole 31e of the right connecting plate 31d attached to the right brake pedal 31 to connect the left and right brakes. Or it is configured such that the left and right brakes are disconnected and retracted. A return spring 31f is interposed on the right side of the brake connection pin 31c, and the brake connection pin 31c is urged to protrude and move to the right side to return the left and right brakes to the connected state.

  If the tip of the brake connecting pin 31c is conical, the left and right brakes can be released smoothly. Further, when the support cylinder 31b is covered with a cylindrical cover fixed to the base plate 31a, the appearance can be improved.

  According to the said structure, the front end side of the wire cable 39 and the brake connection cancellation | release means 31 can be attached to the base plate 31a, a number of parts can be reduced and cost reduction can be aimed at. In addition, since the brake connection pin 31c of the brake connection release means 31 is directly connected to the wire cable 39, the connection loss can be eliminated and the connection release of the left and right brakes can be improved.

Next, another embodiment of the left and right connection operation structure of the left and right brake pedals 21 and 21 will be described with reference to FIG.
In a tractor including the left and right brake pedals 21 and 21 and the left and right brake connection switch SW1, even when the left and right brake connection switch SW1 is not connected to the left and right brakes, the brake connection solenoid 23 is always in the connected state of the left and right brakes. It is configured. The left and right foot detection sensors SE3 and SE3 are provided at portions of the left and right brake pedals 21 and 21 that are long in the left and right direction and separated from each other on both left and right sides.

  Therefore, the brake coupling solenoid is instructed by the command of the controller 26 only when the left and right brake coupling switch SW1 is operated in a non-coupled state of the left and right brakes and either one of the left and right foot detection sensors SE3 and SE3 detects the footstep. The left and right brake pedals 21 and 21 are in an independent operation state.

  According to the above configuration, the left and right brake pedal 21 is operated only when the left and right brake connection switch SW1 is operated to the left and right brake non-connected state and one of the left and right foot detection sensors SE3 and SE3 is stepped on at the operator's will. , 21 are in a left and right independent operation state, so that it is safe to operate the left and right brakes in a connected state when traveling on the road.

  In addition, even when the switching operation of the left and right brake connection switch SW1 is forgotten, the left and right brake pedals 21 and 21 do not enter the left and right independent operation unless the operator steps on one of the left and right foot detection sensors SE3 and SE3. So it is safe.

  Further, a handle turning angle sensor SE4 is added to the left / right brake connection release control means, and it is determined that the field work is performed only when the handle turning angle sensor SE4 detects a turning angle greater than a predetermined angle (or the maximum turning angle), The left and right brake pedals 21 and 21 may be in a left and right independent operation state.

21 Left and right brake pedal 21a Long left and right stepping portion 21b Left and right shaft 22 Locking connection body 23 Brake connection solenoid 23a Tubular body 23b Solenoid connection pin 26 Controller 28 Brake connection actuator 31 Brake connection release means SW1 Left and right brake connection switch SW2 Left / right brake connection automatic on / off switch SW3 Front wheel accelerated turning control automatic on / off switch SE1 Front / rear tilt sensor SE2 Left / right tilt sensor

Claims (5)

  The left and right brake pedals (21, 21) are separately pivotally supported around the left and right axis (21b) on the traveling vehicle body, and one of the left and right brake pedals (21, 21) that is long in the left and right direction is stepped on. A locking connection body (22) is attached to the back side of the part (21a), a brake connection solenoid (23) is attached to the back side of the other stepping part (21a) that is long in the left-right direction, and the brake connection solenoid (23) is set to the left-right direction. A cylindrical body (23a) along the cylinder, a fixed coil and a movable coil disposed in the cylindrical body (23a), and a movable coil that is movably mounted in the cylindrical body (23a) in the left-right direction. A work vehicle comprising a solenoid connecting pin (23b) to which the solenoid connecting pin is attached and a return spring for returning the solenoid connecting pin (23b).   In the first aspect of the present invention, when the left and right brake connection switch (SW1) is provided, the left and right brake connection switch (SW1) is turned on, and the fixed coil of the brake connection solenoid (23) is energized, the fixed coil is excited and movable. A work vehicle characterized in that a solenoid connecting pin (23b) to which a coil is attached is moved to the retracting side so that the left and right brakes are not connected.   In the first and second aspects of the present invention, when the brake connection solenoid (23) is operated in a non-connected state of the left and right brakes, the brake connection solenoid (23) is connected to the left and right brakes after a predetermined time has elapsed. A work vehicle comprising a controller (26) for switching to a connected state.   According to the first to third aspects of the present invention, a vehicle body front / rear inclination adjustment means or a right / left inclination adjustment means is provided, a front / rear inclination sensor (SE1) or a left / right inclination sensor (SE2) is provided, and the brake connection solenoid (23) is When the brake is not connected, when the front / rear inclination sensor (SE1) or the left / right inclination sensor (SE2) detects an inclination of a predetermined angle or more, the brake connection solenoid (23) is connected to the left / right brake. A work vehicle characterized in that a function of switching to is added to the controller (26).   The left and right brake pedals (21, 21) are pivotally supported separately and provided with brake connection release means (31) for releasing the connection between the left and right brake pedals (21, 21). 31) A brake connection actuator (28) for releasing the connection is provided, a left and right brake connection switch (SW1) for releasing the connection of the brake connection release means (31), a left and right brake connection automatic on / off switch (SW2), and front wheel acceleration turning control. In a work vehicle provided with an automatic on / off switch (SW3), the left and right brake connection automatic on / off switch (SW2) is in an automatic on state, the left and right brake connection switch (SW1) is off and in a disengaged state, and When the front wheel acceleration turning control automatic on / off switch (SW3) is automatically turned off, move the brake connection release actuator (28) to the left. A work vehicle, characterized in that a controller (26) to the connection state of the brake.

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