JP2010143244A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle including a PTO on/off-operation tool for the on/off-operation of the drive of a PTO shaft for transmitting power to a working machine connected to a traveling machine body, and an engine start circuit enabling the start of the engine when the off-operation of the PTO on/off-operation tool is performed, capable of performing an engine start operation, and the on/off-operation of the PTO on/off-operation tool smoothly all the time. <P>SOLUTION: The working vehicle includes the PTO on/off-operation tool 42 for the on/off-operation of the drive of the PTO shaft 13 for transmitting power to the working machine 6 connected to the travelling machine body 3, and the engine start circuit 53 enabling the start of the engine when the off-operation of the PTO on/off-operation tool 42 is performed. A lighting apparatus 47 lighting the PTO on/off operation tool 42 is arranged in the vicinity of the PTO on/off-operation tool 42. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a work vehicle including a PTO on / off operation tool for turning on / off a drive of a PTO shaft that transmits power to a work machine coupled to a traveling machine body.

2. Description of the Related Art A work vehicle having a PTO on / off operation tool for turning on / off a drive of a PTO shaft that transmits power to a work machine connected to a traveling machine body is conventionally known. In such a work vehicle, there is a drawback in that the operator may start the engine without noticing the input operation state of the PTO input operation tool, and the PTO shaft may be unexpectedly driven. In order to improve such a drawback, a work vehicle shown in Patent Document 1 including an engine start circuit that enables an engine to be started when a PTO on / off operation tool is turned off has been developed and publicly known.
Japanese Patent No. 4132613

In the work vehicle described in the above document, since the engine start circuit is restricted by the engine start circuit when the PTO on / off operation tool is turned on, the PTO shaft is prevented from being unexpectedly driven. When working in a dark place, it is difficult for the operator to visually recognize the presence of the PTO on / off operation tool, and the engine start operation and the PTO shaft drive on / off operation may not be performed smoothly. is there.
The present invention is provided with a PTO on / off operation tool for turning on / off a drive of a PTO shaft that transmits power to a work machine connected to a traveling machine body, and at the time of a turning operation of the PTO on / off operation tool. An object of the present invention is to provide a work vehicle having an engine start circuit that can start an engine and capable of smoothly and smoothly performing an engine start operation and an on / off operation of a PTO on / off operation tool.

  In order to achieve the above object, the work vehicle of the present invention firstly includes a PTO on / off operation tool 42 for turning on / off the drive of the PTO shaft 13 that transmits power to the work machine 6 connected to the traveling machine body 3. At the same time, in a work vehicle equipped with an engine start circuit 53 that enables the engine to be started when the PTO on / off operation tool 42 is turned off, the illumination tool 47 that illuminates the PTO on / off operation tool 42 is replaced with the PTO on / off operation tool 42. It is characterized by being provided in the vicinity of.

  Secondly, a PTO on / off operation tool 42 for turning on / off the drive of the PTO shaft 13 for transmitting power to the work machine 6 connected to the traveling machine body 3 is provided, and the engine is operated when the PTO on / off operation tool 42 is turned off. In a work vehicle equipped with an engine start circuit 53 that enables the start of the illuminating device, an illumination tool 47 for illuminating the mark portion 46a indicating the position of the PTO on / off operation tool 42 is provided in the vicinity of the mark portion 46a. Yes.

  According to the work vehicle configured as described above, the PTO on / off operating tool or the mark portion indicating the position of the PTO on / off operating tool is brightly illuminated by the lighting tool even in a dark place, and the operator can perform the PTO on / off operating tool. Since it is easy to visually recognize the presence of the PTO shaft, there is an effect that the on / off operation of the PTO shaft and the engine start operation can be performed more smoothly.

Embodiments of the present invention will be described below based on the illustrated example.
FIG. 1 is an overall side view of a tractor to which a work vehicle of the present invention is applied. The tractor includes a traveling machine body 3 having a pair of left and right front wheels 1, 1 and rear wheels 2, 2, and a working machine 6 such as a rotary tillage device connected to a rear end portion of the traveling machine body 3 by a link mechanism 4 so as to be movable up and down. It has. A cabin 7 is erected on the rear half of the traveling machine body 3, and a control unit 8 is provided in the cabin 7.

  FIG. 2 is a side sectional view showing the configuration of the mission case. The power of an engine (not shown) housed and installed in the hood 9 (see FIG. 1) in the front half of the traveling machine body 3 is transmitted through the transmission 12 in the transmission case 11 and the front and rear wheels 1 and 2 and the PTO shaft (output shaft). 13 is transmitted at a variable speed.

  Specifically, engine power is intermittently transmitted to the transmission 12 by a main clutch 14 that is manually turned on and off by an operator. The power input from the main clutch 14 to the transmission 12 is distributed and transmitted to the traveling transmission mechanism 16 and the work machine transmission mechanism 17.

  The travel transmission mechanism 16 includes a main transmission unit 18 that performs four-stage shift switching using a hydraulic clutch, a forward / reverse switching unit 19 that performs forward / reverse switching using a hydraulic clutch, and a shift switching unit 21 that mechanically performs three-stage shift switching. And a sub-transmission unit 22 that performs two-stage shift switching by a hydraulic clutch, and a travel transmission shaft 23 that transmits power to the forward and backward movements 1 and 2, and a main transmission unit 18 → forward / reverse switching unit 19 → shift switching unit. Power is transmitted in the order of 21 → sub transmission 22 → traveling transmission shaft 23.

  The work machine transmission mechanism 17 includes a PTO clutch 24 that is a hydraulic clutch that interrupts power by an on / off operation, and a shift switching unit 26 that shifts the power from the PTO clutch 24 and transmits the power to the PTO shaft 13. . The PTO shaft 13 is inserted and connected to the work machine 6 side when the work machine 6 is connected to the traveling machine body 3, and is configured to output power to the work machine 6. By the way, the PTO shaft 13 of this tractor is an independent PTO (IND PTO) that can be switched on and off independently of the front and rear wheels 1 and 2 without switching the PTO clutch 24 on and off. Yes.

Next, the configuration of the control unit 8 will be described with reference to FIGS.
FIG. 3 is a main part plan view showing a configuration around the seat of the control unit, and FIG. 4 is a main part rear view showing a configuration of a front operation unit of the control unit. The control unit 8 includes a seat 27 on which an operator is seated and a front operation unit 28 in front of the seat 27.

  A display panel 29 is installed above the front operation unit 28, and a steering handle 31 for performing a steering operation is disposed behind the display panel 29. The display panel 29 is provided with a liquid crystal screen (display unit) 33 for displaying various types of information in addition to a meter 32 indicating vehicle speed and the like. A key switch (engine start operation tool) 36 for starting the engine by inserting and turning the key 34 is installed below the display panel 29 in the front operation unit 28.

  A shift lever (travel shift operation tool) 37 for performing a travel shift operation is disposed on the left (left) side of the seat 27 in the traveling direction, and the lift is performed to swing the work implement 6 by swinging on the right side. A lever (elevating operation tool) 38 is installed. An operation panel 39 for performing various operations of the PTO shaft 13 is disposed diagonally to the right of the lift lever 38 (to the right of the seat 27).

  FIG. 5 is a plan view of the operation panel, and FIG. 6 is a side sectional view showing the configuration of the operation panel. The operation panel 39 includes a dial operation type changeover switch (switching operation tool) 41, a PTO drive switch (PTO on / off operation tool) 42, and a push button type up / down interlocking changeover switch (elevation interlocking switching operation tool) 43. Is provided.

  The changeover switch 41 is installed in the front part of the operation panel 39, and is an interlocking mode in which the driving / running stop of the traveling machine body 3 or the driving / running stop operation of the traveling machine body 3 is linked with the turning on / off of the driving of the PTO shaft 13 by dial operation. And mode switching to the independent mode that is not linked. In the interlocking mode, when the traveling machine body 3 is stopped, the PTO shaft 13 is stopped, while when the traveling machine body 3 is traveling, the PTO shaft 13 is driven.

  Every time the above-described lift interlock switch 43 is pressed once, it switches between a lift interlocking mode in which the driving of the PTO shaft 13 is interlocked with the lift or lift operation of the work machine 6 and a lift non-interlocking mode that is not interlocked. Is done. And when the working machine 6 descends into the state where it is possible to perform tillage work in the lift interlocking mode, the PTO shaft 13 is automatically driven while the working machine 6 rises to a non-working height. The PTO shaft 13 is automatically stopped.

  The PTO drive switch 42 is provided in an installation portion 46 made of a translucent member located at the center in the front-rear direction on the upper surface of the operation panel 39. Behind the installation location of the PTO drive switch 42 in the installation section 46, characters "PTO" are printed to indicate a mark portion 46a indicating the position of the PTO drive switch 42, and characters "push and cut" are described later. A cutting operation explanation section (operation explanation section) 46b indicating a cutting operation means (operation means) of the PTO drive switch 42 is formed. On the other hand, an input operation explanation part (operation explanation part) 46c indicating an entry operation means (operation means) of the PTO drive switch 42 described later is formed in front of the place where the PTO drive switch 42 is installed in the installation part 46.

  The PTO drive switch 42 is supported by the operation panel 39 so that it can be rotated left and right and can be pushed in a range from one end (cut end) to the other end (entrance end). And it is always elastically biased by the elastic member (not shown) at the cut end side.

  The operator performs an input operation to bring the PTO shaft 13 into a driveable state by rotating the PTO drive switch 42 located at the cut end to the input end while pushing. Since the PTO drive switch 42 is configured to be engaged and held at the entry side end, the PTO drive switch 42 is turned on even if the operator releases the PTO drive switch 42 after performing the above entry operation. Held in operational state.

  On the other hand, when the PTO drive switch 42 in the on operation state is pressed once, the engagement holding at the input side end of the PTO drive switch 42 is released, and the PTO drive switch 42 is cut off by the elastic member described above. And the drive of the PTO shaft 13 is stopped. In other words, the operator performs a turning operation to bring the PTO shaft 13 into a driving stop state by pressing the PTO drive switch 42 engaged and held at the entry side end once.

  The interlocking mode / independent mode and the ascending / descending interlocking mode / non-elevating / interlocking mode described above are executed when the PTO drive switch 42 is in the on-operation state, so As described above, on / off control of the drive of the PTO shaft 13 is performed based on the lifting or lowering operation of the machine 6. On the other hand, when the PTO drive switch 42 is turned off, the PTO shaft 13 is always stopped.

  Incidentally, in the independent mode and the non-elevation interlocking mode, the PTO drive switch switch 42 is turned on regardless of the traveling / traveling stopped state and traveling / traveling stop operating state of the traveling machine body 3 and the lifting / lowering operating state of the work implement 6. By the turning operation, the PTO shaft 13 can be driven and stopped (driving on / off).

  Specifically, the on / off control of the drive of the PTO shaft 13 as described above is performed by the control device 45 (see FIG. 7) mounted on the tractor.

Next, the peripheral configuration of the PTO drive switch 42 will be described with reference to FIGS.
In the operation panel 39, a pair of left and right operation tool illumination LEDs (illumination) that are issuing diodes that brightly illuminate the PTO drive switch 42, the mark portion 46a, and the cut operation explanation portion 46b are located behind the PTO drive switch 42 and in front of the upstop LED 44. G) 47 and 47 are accommodated and supported.

  The pair of operation tool illumination LEDs 47 and 47 are mounted on the inner surface side of the operation panel 39 by the support body 48 with the up-stop LED 44 disposed in the state of being close to the PTO drive switch 42, the mark portion 46a, and the cutting operation explanation portion 46b. It is installed on a fixed base 49. Between the upper surface of the base 49 and the inner surface of the operation panel 39, a light guide 51 that guides light emitted from the operation tool illumination LEDs 47 and 47 to the rear side of the installation portion 46 is interposed.

  Then, the light emitted from the operation tool illumination LED 47 and guided by the light guide 51 illuminates the mark part 46a and the cutting operation explanation part 46b brightly, passes through the mark part 46a, and reaches the upper surface side of the operation panel 39. The PTO drive switch 42 and the input operation explanation part 46c are illuminated brightly. Therefore, it becomes easy for the operator to clearly see the outline of the PTO drive switch 42 even in a dark place such as in the cabin 7 or at night, while looking at the description of the turning operation explanation section 46b and the entry operation explanation section 46c. Thus, the turning on / off operation of the PTO drive switch 42 can be performed smoothly.

  It is possible to omit the light guide 51 and directly illuminate the mark portion 46a, the cutting operation explanation portion 46b, the on / off operation explanation portion 46c, and the PTO drive switch 42 with the operation tool illumination LEDs 47 and 47. By using the body 51 as described above, it is possible to efficiently illuminate the mark portion 46a and the PTO drive switch 42 efficiently with a smaller amount of light. In addition, since the operator sitting on the seat 27 visually recognizes the PTO drive switch 42 slightly from the rear, the visibility of the PTO drive switch 42 is further improved by arranging the operation tool illumination LED 47 behind the PTO drive switch 42. To do.

Next, the configuration of the control device 45 will be described with reference to FIG.
FIG. 7 is a block diagram showing the control contents of the control device. The control device 45 includes a control unit 52 formed by connecting a plurality of microcomputers by CAN (Control Area Network), and an engine start circuit (engine circuit) 53 for starting the engine.

  The control unit 52 is configured to control information displayed on the liquid crystal screen 33. In addition, on the input side of the control unit 52, together with the PTO drive switch 42, the changeover switch 41, and the lift interlocking changeover switch 43 described above, a clutch switch (ON / OFF) for detecting the ON / OFF operation of the clutch pedal for intermittently operating the main clutch 14 is detected. Off detection means) 54 is connected. On the other hand, on the output side of the control unit 52, in addition to the above-described up-stop LED 44, a PTO valve (an electromagnetic proportional control valve that controls on / off operation of the PTO clutch 24 by controlling the supply / discharge of the pressure oil of the PTO clutch 24). PTO on / off means) 56 is connected.

  Then, the controller 45 detects the turning on / off operation of the PTO drive switch 42 and the switching operation of the changeover switch 41 and the ascending / descending interlocking changeover switch 43 as described above. Drive on / off control is performed. In addition, the control unit 45 turns on the up-stop LED 44 when switched to the lift interlocking mode by the lift interlocking switch 43, and switches to the lift non-interlocking mode by the lift interlocking switch 43. Turns off the up-stop LED 44.

  Incidentally, the clutch switch 54 is provided for detecting a traveling / traveling stop operation of the traveling machine body 3. By depressing the clutch pedal, the main clutch 14 is disengaged, the power transmission from the engine to the transmission 12 is cut off, and the clutch switch 54 is turned on. On the other hand, by releasing the depression of the clutch pedal, the clutch pedal is released from the depression state by the elastic force of the elastic member, the main clutch 14 is engaged and activated, and power is transmitted from the engine to the transmission 12. The clutch switch 54 is turned off.

  In addition to the key switch 36 and the pair of operating tool illumination LEDs (illuminating tools) 47, 47, the engine starting circuit 53 is connected (ON) when the PTO driving switch 42 is turned off, while being driven by PTO. A safety relay (relay circuit) 57 that is in a disconnected state (OFF state) when the switch 42 is in an on-operation state, and a connected state (ON state) when the clutch switch 54 is in an ON state, while a disconnected state when the clutch switch 54 is in an OFF state A clutch relay (relay circuit) 58 that is in an OFF state, a 12V DC power source (power source) 59, and a starter motor (engine starting means) 61 that starts the engine are provided.

  The key switch 36 includes a power contact 36 a electrically connected to the power source 59, a lighting contact 36 b electrically connected to the operation tool illumination LEDs 47 and 47, and the two relay circuits 57 and 58 on the starter motor 61. And a starting contact 36c that can be electrically connected via the terminal. Incidentally, the two relay circuits 57 and 58 are electrically connected directly, and the start contact 36c and the starter motor 61 are electrically connected only when the two relay circuits 57 and 58 are connected. The

  Then, by inserting the key 34 and rotating around the axis, the power contact 36a is not electrically connected to either the lighting contact 36b or the starting contact 36c, and the power contact 36a is turned on. 36b and the start contact 36c, a lighting state that is electrically connected only to the lighting contact 36b, or a power supply contact 36a that is electrically connected to the lighting contact 36b and the start contact 36c. Switched. Specifically, the state is switched in the order of disconnected state → lighting state → started state by inserting the key 34 and performing a turning operation (engine starting operation).

  When switched to the lighting state as described above, the power contact 36a and the lighting contact 36b are electrically connected, the operation tool illumination LEDs 47 are lit, and the PTO drive switch 42 and the like are illuminated brightly.

  Subsequently, when the lighting state is switched to the starting state and the power contact 36a is electrically connected to the lighting contact 36b and the starting contact 36c, the main clutch 14 is turned off by the clutch pedal and the PTO drive switch 42 is turned off. In this case, since the two relay circuits 57 and 58 are connected to each other and the power source 59 is electrically connected to the starter motor 61, the starter motor 61 is driven and the engine is started. In other cases, one or both of the two relay circuits 57 and 58 are disconnected and the power source 59 and the starter motor 61 are not electrically connected. Therefore, the starter motor 61 is not driven and the engine is also started. Not.

  In other words, the engine start circuit 53 starts the engine only when the drive of the PTO shaft 13 is turned off and the main clutch 14 is turned off, and in other cases, the engine that restricts the engine start is controlled. It is configured to function as a start restriction circuit. In addition, from the above configuration, the PTO drive switch 42 and the like are always turned on before the engine is started, and the PTO drive switch 42 and the like are brightly illuminated by the operation tool illumination LED 47, so that it is easy to visually recognize the PTO drive switch 42. Thus, the turning-off operation of the PTO drive switch 42 can be performed smoothly.

1 is an overall side view of a tractor to which a work vehicle of the present invention is applied. It is a sectional side view which shows the structure of a mission case. It is a principal part top view which shows the structure around the seat of a control part. It is a principal part rear view which shows the structure of the front operation part of a control part. It is a top view of an operation panel. It is a sectional side view which shows the structure of an operation panel. It is a block diagram which shows the control content of a control apparatus.

Explanation of symbols

3 traveling machine body 6 working machine (rotary tillage device)
13 PTO shaft (output shaft)
42 PTO drive switch (PTO ON / OFF operation tool)
46a Mark part 47 Operation tool lighting LED (lighting tool, issuing diode)
53 Engine start circuit (engine circuit, engine start regulation circuit)

Claims (2)

  The PTO on / off operation tool (42) for turning on / off the drive of the PTO shaft (13) for transmitting power to the work machine (6) connected to the traveling machine body (3) is provided. In the work vehicle provided with the engine start circuit (53) that enables the engine to be started at the time of the turning operation of), the illumination tool (47) that illuminates the PTO on / off operation tool (42) is replaced with the PTO on / off operation tool (42). ) Work vehicle provided in the vicinity.   The PTO on / off operation tool (42) for turning on / off the drive of the PTO shaft (13) for transmitting power to the work machine (6) connected to the traveling machine body (3) is provided. In the work vehicle equipped with the engine starting circuit (53) that enables the engine to be started at the time of the turning operation of), the illumination tool (47) illuminates the mark portion (46a) indicating the position of the PTO on / off operation tool (42). Is provided in the vicinity of the mark portion (46a).

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