JP2008137465A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain starting of an engine when sitting of an operator is detected by a seat switch and to ensure safety by switching advancement/retreating to a neutral position when it detects the non-sitting. <P>SOLUTION: The seat switch 33 switched-on when the operator sits on a seat 6 or 28 is provided, and the switch-on of the seat switch enables starting of the engine. After starting of the engine, an advancement/retreating switching means A is controllably provided so as to be switched to the neutral position by (off) of the seat switch 33 by non-sitting. Further, the constitution of the working vehicle is made to an interlocking constitution for simultaneously giving braking action to a traveling transmission system by a traveling braking means 60. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a work vehicle in which a work device such as a front loader or a backhoe is attached to a front part or a rear part of a vehicle body.

Conventionally, an operation seat provided with a seat switch for detecting whether an operator is seated or not is known from Patent Document 1 or the like.
JP-A-63-251329

Such a seat switch is configured to automatically stop the engine after a predetermined time when it is detected that the operator is not seated.
An object of the present invention is to enable starting of the engine when the seat switch detects that the operator is seated, and to switch the forward / reverse movement to the neutral position and to ensure safety when detecting the non-sitting time. is there.

In order to solve the above problems, the present invention has taken the following technical means.
That is, the present invention according to claim 1 is a work vehicle in which a work device such as a front loader or a backhoe is attached to the front part or the rear part of the vehicle body. A forward / reverse switching means (A) for switching to the neutral position is provided, and a seat switch (33) that operates when the operator sits on the seat (6, 28) is provided, and the seat switch (33) is activated. The engine can be started by the control, and after the engine is started, the forward / reverse switching means (A) can be controlled to be switched to the neutral position by “turning off” the seat switch (33) when the operator is not seated. It is characterized by that.

  When configured as described above, the seat switch (33) is turned on when the operator sits on the seat (6 or 28) during vehicle operation. With this switch "ON", the engine can be started by operating the engine start switch (34). After the engine is started, when the seat switch (33) is turned off due to the non-sitting of the operator, the forward / reverse switching means (A) is automatically switched to the neutral position.

  When driving, the engine will not start unless it is seated and the seat switch (33) is turned on, so it is safe. Further, after the engine is started, the forward / reverse switching means (A) is switched to the neutral position even if the seat switch (33) is turned off due to the non-sitting of the operator, and the vehicle does not start unexpectedly. Even if the work is performed with the vehicle stopped, it can be performed safely.

  According to a second aspect of the present invention, in a work vehicle in which a work device such as a front loader or a backhoe is mounted on the front or rear of the vehicle body, the vehicle body is moved forward, backward, or neutral by operating the forward / reverse switching means. And a forward / reverse switching means (A) for switching to and a traveling braking means (60) for applying a braking action to the traveling transmission system, and a seat switch ("ON") when the operator sits on the seat (6, 28). 33) is provided, and the engine can be started by the "ON" operation of the seat switch (33). After the engine is started, the forward / reverse switching is performed by the "OFF" operation of the seat switch (33) when the seat switch is not seated. It is characterized in that the means (A) is switched to the neutral position and is interlocked to apply a braking operation to the traveling transmission system by the traveling braking means (60).

  After the engine is started, when the seat switch is turned off due to the non-sitting of the operator, the forward / reverse switching means (A) becomes neutral, and further, the driving transmission system is braked, so that the vehicle does not start unexpectedly. The vehicle can be maintained in a stopped state reliably, and work in a stopped state can be performed with peace of mind.

  In short, according to the first aspect of the present invention, it is safe because the engine can be started for the first time by sitting on the seat and "turning on" the seat switch (33) during operation. In addition, after the engine is started, even if the seat switch (33) is turned off due to the non-sitting of the operator, the forward / reverse switching means (A) is switched to neutral, so that the vehicle does not start unexpectedly. Work with the vehicle stopped can be performed safely. In particular, in a non-sitting state, it is safe because normal work cannot be performed.

  According to the second aspect of the present invention, the forward / reverse switching means (A) can be obtained even when the seat switch (33) is turned off after the engine is started, although the effects of the first aspect are achieved. ) Is neutral, and in addition, the driving transmission system is braked, so that the vehicle can be surely stopped and the operation in the driving stop state can be performed safely.

An embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows a passenger tractor as an example of a work vehicle. An engine E is mounted in a bonnet 2 at the front of the vehicle body 1, and the rotational power of the engine is transmitted to a transmission in a mission case 3. The rotational power decelerated by the transmission is transmitted to the front wheels 4 and the rear wheels 5. A steering handle 7 is provided in front of the driver's seat 6, and a cabin 8 is installed above them.

  A front loader 10 is provided on the front side of the vehicle body 1, and a backhoe 11 is provided on the rear side of the vehicle body 1. The front loader 10 is supported by the front bracket 12. A loader boom 13 is supported on the front bracket 12 and is lifted and lowered by a hydraulically extendable lift cylinder 14, and a bucket 15 provided at the tip of the loader boom 13 is configured to be able to be stowed and dumped by an extension operation of the bucket cylinder 16. is doing. The backhoe 11 is supported by an outrigger 18 with a rear bracket 17 attached to the rear end of the vehicle body 1. At the rear part of the rear bracket 17, a swing bracket 19 is installed so as to be swingable around a swing shaft 20 in the vertical direction, and a lift boom 21 is provided so as to be able to rotate up and down with respect to the swing bracket 19. It can be moved up and down by hydraulic expansion and contraction. In addition, a bucket arm 23 is pivotally attached to the rear end of the lift boom 21 so as to be pivotable up and down, and is configured to be pivotable by hydraulic expansion and contraction of the arm cylinder 24. A bucket 25 is rotatably provided at the tip of the bucket arm 23 via a bucket link 26 and is rotatably provided by hydraulic expansion / contraction of the bucket cylinder 27.

  A rear seat 28 and an operation table 29 for operating the backhoe 11 are provided on the rear bracket 17, and a driver is seated in a rearward posture on the rear seat 28 to operate the rear work machine on the operation table 29. The operation tool 30, the rear shuttle switch 31, the steering switch 32, etc. are operated to operate the backhoe 11. The operation tool 30 moves the bucket 25 up and down by an operation in the front-rear direction, and the bucket turns around the turning shaft 20 by an operation in the left-right direction.

  The clutch housing 40 constituting the main body of the vehicle body 1, the transmission case 3, the axle housing 42, and the like are provided with a main clutch 44 on an input shaft 43 input from the engine E, and are moved forward and backward linked to the input shaft 43. Shuttle clutches 46 and 47 for switching from the neutral position N of the shuttle clutch transmission stop to the gear transmission of the forward position F and the reverse position R are provided on the shaft 45 as the forward / reverse switching means (A). The main transmission shaft 48 is provided with a main transmission gear 49, and the auxiliary transmission shaft 50 is provided with an auxiliary transmission gear 51 to transmit the pinion gear shaft 52. The pinion gear shaft 52 drives the rear wheel 5 via the rear differential gear 53 and transmits a front wheel take-out shaft 54 that is linked to the front wheel 4. The front wheel take-out shaft 54 is provided with a front wheel clutch 55 for switching between 2WD and 4WD. In addition, the PTO transmission shaft 56 is gear-transmitted from the input shaft 43 to transmit the rear PTO shaft 57. A lift arm 59 that is moved up and down by a hydraulic cylinder 58 is provided at the upper rear end of the transmission case 3, and a working machine such as a rotary tiller is mounted on the rear of the tractor via a three-point (3P) link mechanism. It is configured to be able to.

  Near the floor below the steering handle 7, left and right brake pedals 61L and 61R of the braking device 60 for traveling to the left and right rear wheels, a parking brake lever 62, and the like are provided. The traveling braking device 60 imparts a braking action to the traveling transmission system to the left and right rear wheels, and the left and right brake solenoids 63L, 63R and the left and right brake cylinders 64L, 64R are operated by depressing the brake pedal 61R (61L). It is configured to operate via Further, the on / off state of the parking brake lever 62 is also detected by the detection switch 64, so that an overlapping operation can be avoided. When the parking brake is operated, the hydraulic output is turned off by braking with a rod through a mechanical link mechanism.

  The driver's seat 6 (rear seat 28) is provided with a seat switch 33 that is "ON" (ON) / "OFF" (OFF) when the operator is seated or not seated. When the operator sits on the seat 6, the seat switch 33 is turned on. When the seat switch 33 is turned on, the engine E can be started by operating the engine start switch 34. After the engine is started, even when the seat switch is turned off, that is, when the seat switch 33 is turned off due to the non-sitting of the operator, the forward / reverse switching means (A) automatically moves forward / backward via the control device 35. It can be switched to the neutral position.

  Further, at the neutral position of the forward / reverse switching means (A), the traveling braking device 60 is also activated based on the “off” (off) operation of the seat switch 33, and the traveling transmission system is braked. The traveling stop state can be reliably maintained. The PTO shaft can be stopped simultaneously with this brake, but in this case, since the work in the travel stop state cannot be performed, the operator sits on the seat and returns the seat switch 33 to the original switch-on state, and travels. The normal work cannot be performed unless the stop state is released.

  When working on the front loader 10 or the like on the work vehicle, the operator normally sits on the driver's seat 6 and operates the front shuttle switch 36 to turn the forward / reverse switches 36F and 36R on and off, The forward / reverse switching valve 47 is output to the forward solenoid 66 or output to the reverse solenoid 67 to perform forward / reverse operation. Further, the work of the backhoe 11 and the like is seated on the rear seat 28 and moves forward and backward by operating the rear shuttle switch 31. In this backward work operation, the forward / reverse switch 36F, 36R is turned ON / OFF by the operation of the rear shuttle switch 31, and the forward / backward switching valve of the shuttle clutches 46, 47 is output to the forward solenoid 66 or output to the reverse solenoid 67. Then move forward and backward. Further, the steering switch 32 pushes the left steering switch 32L or the right steering switch 32R to turn it ON, outputs the left steering solenoid 68 or the right steering solenoid 69, and operates the steering control valve. To output the steering clutch to control the direction of the aircraft.

  In the control valve 70 for controlling the operating cylinder to the backhoe 11 by the operation of the operation tool 30, the locked state in which the operation tool 30 is locked so that the control valve does not operate, and the operation of the operation tool so that the control valve operates. Is provided with a lock arm 71 for switching to a non-locking state that allows the engine E, and a lock hook 73 that can be engaged and disengaged with respect to a lock pin 72 provided on the lock arm is provided, so that the engine E is in operation or the seat switch 33 When the switch on is detected, the wire 75 is pulled by the motor (or solenoid) 74 and the locking hook 73 is removed from the lock pin 72 to make it unlocked. In other cases, that is, the engine E is stopped. When the seat switch 33 is off, the hook 75 is not pulled by the restoring force of the lock spring 76 without pulling the wire 75. It is configured to interlock by engaging the lock pin 72.

  The embodiment shown in FIG. 10 enables the driver's seat 6 to turn 180 degrees forward and backward around the pivot axis Q in the vertical direction, in a forward normal driving posture (A) and a rearward backhoe working posture (B). The configuration can be changed. The pivot axis Q is set at the center of the seat slide range L (160 mm) in the front-rear direction and at a position that is substantially the center of the suspense mechanism 78.

  Conventionally, in the configuration of the light switch, as shown in FIG. 12, both the buzzer and the beacon are activated when the switch SW1 is turned on, and only two beacons are activated when the switch SW2 is turned on. . In this example, the switch has a switch 80 configuration as shown in FIG. 12, that is, the switch 80 of this example is switched on when the left side is pushed from the neutral position in FIG. 12 (a) as shown in FIG. 12 (b). As shown in FIG. 12 (c), by pressing the right side as shown in FIG. 12C, the switches are integrated so that a beacon lamp can be activated when the switch is turned on, thereby reducing the number of switches and reducing costs.

  As shown in FIGS. 13 to 15, in the related configuration of the boot 82 that covers the base side of the operation lever 81 and the lever guide 83 of another operation lever, if there is a conventional lever guide installation, the lever Normally, boots are attached to the guide. However, when molding the lever guide with resin, it is difficult to change the boots in order to create a family feeling with the current machine. The current boot has a special attachment portion (see FIGS. 18 and 19), and the shape of the attachment portion is difficult to mold with resin. In this example, the boot mounting hole 83a of the lever guide 83 is molded so as to enter the bellows portion of the boot 82, and the boot 82 has a shape in which the boot mounting hole 83a of the lever guide is inserted into the constricted portion 82a of the bellows. And attached to the lever guide. Thereby, the installation of the boots may be left as it is, and moreover, a sense of unity with the resin lever guide can be given better.

  Further, as shown in FIG. 16, the presser portion 83b of the boot 82 by the lever guide 83 is formed in an inclined shape (inclination angle α), and the inclination of the presser portion floats from the boot shoulder 82b. Is supported by the back rib 83c of the lever guide to prevent the boot from being lifted. Further, in the boot mounting portion 84 of the lever guide 83, the folded-back portion 84a as shown in FIG. 17 (X) of the boot mounting portion 84 is abolished, and the boot mounting portion 84 having a shape as shown in FIG. This makes it easy to attach the boots.

  In the embodiment shown in FIGS. 20 and 21, in a tractor having a flip-up hood (bonnet), the hood 2 can be opened upward around the fulcrum P when the key 86 is removed. The lid 87 of the fuel filler provided in the hood 2 is locked with a hook from the inside. Accordingly, when the key 86 is removed and the hood is lifted upward, the hook inside the lid 87 of the filler port can be removed, so that the lid 87 can be opened and fuel can be supplied from the filler port. This can prevent theft of fuel.

Side view of tractor with front loader and backhoe Side view of tractor travel transmission mechanism Block diagram of work operation control unit Side view of the main part of the tractor Side of main part Side view of the main part of the tractor Front view of the main part Side view of the main part of the tractor Partial enlarged side view Side view showing seat posture change mechanism Top view of conventional light switch Side view of improved light switch Side view of lever boot and lever guide Same as above Side view of the main part 13 is an enlarged side view of the main part. (X) Side view of conventional boot mounting part, (Y) Side view of improved boot mounting part Plan view of conventional boot mounting part Side view of conventional boot mounting part Side view of the main part of the tractor hood Perspective view of the main part

Explanation of symbols

A Forward / reverse switching means 6 Driver's seat
28 Rear seat 33 Seat switch
34 Engine start switch 35 Control device 60 Driving brake device

Claims (2)

  A seat switch (33) that is switched on when seated on the seat (6) (or 28) is provided, and the engine can be started by switching on the seat switch. After the engine is started, the seat switch (33) that is not seated is [ The work vehicle is provided so that it can be controlled to switch the forward / reverse switching means (A) to the neutral position.   A seat switch (33) that is switched on when seated on the seat (6) (or 28) is provided, and the engine can be started by switching on the seat switch. A work vehicle characterized in that the forward / reverse switching means (A) is switched to the neutral position, and at the same time, the traveling braking means (60) is interlocked to apply a braking action to the traveling transmission system.

Images