JP2005273539A - Engine operation regulating structure for riding type working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an engine start checking means advantageous in wiring and maintenance work, while employing inexpensive construction. <P>SOLUTION: The engine start checking means 63 comprises a shift switch 30 detecting whether a transmission 9 is in a neutral state or not, a brake switch 33 detecting whether a brake 21 is in a braking state or not, a working switch 31 detecting whether a working clutch 11 is in a transmitting state or not, a seat switch 32 detecting whether a driver seat 16 is occupied or not, and a relay switch 46 switching energizing states for permitting and inhibiting the start of the engine 5. The engine 5 is permitted to start, when the shift switch 30 detects the transmission 9 in a neutral state, the brake switch 33 detects the brake 21 in a braking state, the working switch 31 detects the working clutch 11 in a non-transmitting state, and the seat switch 32 detects the seat is in an occupied state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention connects a working device to a traveling machine body provided with a driver's seat, shifts the power from the engine transmitted to the left and right propulsion wheels, a brake for braking the left and right propulsion wheels, The present invention relates to an engine operation restriction structure for a riding-type work machine equipped with a work clutch for switching a transmission state from an engine to the work device.

Conventionally, in a riding work machine, a shift switch that detects whether or not the transmission is in a neutral state, a brake switch that detects whether or not the brake is in a braking state, a work switch that detects whether or not the work clutch is in a transmission state, Control device comprising a seat switch for detecting whether or not the driver seat is in a seated state, and a microcomputer for switching an energized state between a state where the engine is allowed to start and a state where the engine is started based on detection information from each switch. The shift switch detects the neutral state of the transmission, the brake switch detects the braking state of the brake, the work switch detects the non-transmission state of the work clutch, and the seat switch detects the seating state. It has been considered to constitute a starting check means that allows the starting of (see Patent Document 1, for example).
JP 2003-262140 A (paragraph numbers 0035 to 0037, FIGS. 1 to 6)

  When a control device comprising a microcomputer is used in configuring the starting check means as in the above prior art, all switches, wires, connectors, etc. have a waterproof function in order to protect the control device. Since it is necessary to use a new one, the cost increases, and the handling thereof requires considerable care.

  Moreover, when using the control device, it is necessary to connect all the electric wires for transmitting the detection from each switch distributed at each detection location to the control device. It is necessary to secure a large wiring space for concentrated wiring of the wires on the control device side as the length of the wires becomes longer, and the number of connection pins for collectively connecting these wires to the control device Since many large and expensive connectors must be used, the cost is further increased and wiring work and maintenance are difficult.

  An object of the present invention is to make an engine start check means advantageous in terms of wiring work and maintenance while being constructed at low cost.

  As means for solving the above problems, in the present invention, a transmission device that connects a working device to a traveling machine body provided with a driver's seat and shifts power from an engine transmitted to left and right propulsion wheels; Whether or not the transmission is in a neutral state in a structure for restricting the engine operation of a riding-type work machine equipped with a brake for braking the propulsion wheel and a work clutch for switching a transmission state from the engine to the work device. A shift switch for detecting whether or not the brake is in a braking state, a work switch for detecting whether or not the work clutch is in a transmission state, and detecting whether or not the driver seat is in a sitting state The shift switch includes a seat switch, and a relay switch that switches an energized state between a state where the engine is allowed to start and a state where the engine is blocked. The switch detects the neutral state of the transmission, the brake switch detects the braking state of the brake, the work switch detects the non-transmission state of the work clutch, and the seat switch detects the seating state In this case, a start check means for allowing the engine to start is configured.

  According to this configuration, the engine can be started when the operator arrives at the driver's seat and all of the neutral state of the transmission, the braking state of the brake, and the stop state of the work device are revealed. In addition, it is possible to prevent the engine from being started when the operator is away from the driver's seat, and to avoid the inconvenience that the airframe unexpectedly starts when the engine is started and the operation device operates.

  A control device comprising a microcomputer, which is expensive and is restricted by switches used for its protection, and requires high attention in handling in constructing a starting check means for avoiding such inconveniences. When it is not necessary to use it, and it is possible to use non-waterproof and inexpensive non-waterproofing for each switch or connector, etc., and if some of them are deployed near the wheel, for example, affected by mud splashing by the wheel Can be dealt with only by using a waterproof function only for a switch or connector provided at that location, and a non-waterproof switch or connector provided at any other location can be used.

  In addition, the detection switches are subject to some restrictions on their arrangement for the detection, but the arrangement of relay switches and the wiring to each switch, etc., constitute the traveling vehicle body in configuring the starting check means. Compared with the case where the wires from each switch are concentrated on the control device, the length of each wire can be shortened and the wires can be concentrated. Securing a large wiring space for wiring and using a large connector is unnecessary. In addition, during wiring work and maintenance, the detection operation of each switch linked to the wiring of each switch and the state of the detection target, etc. Can be easily confirmed visually.

  Therefore, it is possible to make the engine start check well and to make the start check means advantageous in terms of wiring work and maintenance while using an inexpensive configuration using a non-waterproof switch or the like.

  As one of means for making the present invention more suitable, a relay switch that switches an energized state between a state in which the operation of the engine is continued and a state in which the engine is stopped is provided, and the relay switch, the shift switch, and the brake From the switch, the work switch, and the seat switch, the shift switch detects the non-neutral state of the transmission, the brake switch detects the non-braking state of the brake, and the work switch transmits the work clutch. An engine stop means is provided for stopping the engine when the seat switch detects a leaving state in any of the state detection states.

  According to this configuration, when any one of the non-neutral state of the transmission, the non-braking state of the brake, and the operating state of the work device is displayed, the engine stops when the operator leaves the driver's seat. Thus, it is possible to avoid the inconvenience that the traveling machine body travels while the operator is not seated and the operation device operates.

  And in constructing the engine stop means that avoids the occurrence of those inconveniences, it is not necessary to use a control device comprising a microcomputer that requires high attention to handling, and each switch constituting the start check means, etc. Can also be used.

  Accordingly, each switch constituting the starting check means without using a control device composed of a microcomputer which is expensive and is restricted by switches used for protection of the engine stop means and requires high attention to handling. In addition to being able to stop the engine well when the operator leaves the driver's seat, the degree of freedom of layout of relay switches and wiring to each switch is high. It was possible to make it advantageous in terms of wiring work and maintenance without impairing the advantage that visual confirmation of the detection operation of each switch linked to the state of the detection object can be easily performed.

  As one of means for making the present invention more suitable, a relay switch for switching the energized state between a state where the operation of the engine is continued and a state where the engine is stopped, and switching to the stopped state by this relay switch are delayed. A delay relay that detects a non-neutral state of the transmission from the relay switch and the delay relay, and the shift switch and the brake switch, and the brake switch brakes the brake. The engine delay stop means is configured to stop the engine when the state detection state continues for a predetermined time.

  According to this configuration, since the engine is stopped when the non-neutral state of the transmission and the braking state of the brake are continued for a predetermined time, for example, after starting the engine, the brake is changed from the braking state to the non-braking state. In the state where the release operation for switching to is forgotten, it is possible to prevent the burn-in of the brake that occurs when the transmission is switched from the neutral state to the non-neutral state and the vehicle is driven.

  In addition, during a predetermined time after the non-neutral state of the transmission and the braking state of the brake are revealed, the driver notices the appearances and displays the non-braking state of the brake, or the transmission When an appropriate avoidance operation such as revealing the neutral state of the engine is performed, the engine continues to operate without being stopped, so that the trouble of restarting the engine can be saved.

  And, in constructing an engine delay stop means that can prevent the burn-in of the brake and save the trouble of restarting the engine, a control device comprising a microcomputer that requires a high level of attention in handling is used. There is no need, and each switch constituting the start check means can also be used.

  Therefore, the engine delay stop means is expensive and is restricted by the switches used for its protection, and does not use a control device composed of a microcomputer that requires high attention to handling. While having an inexpensive configuration that also serves as a switch, the engine can be stopped well when both the non-neutral state of the transmission and the braking state of the brake are continuously displayed for a predetermined time. In terms of wiring work and maintenance, the flexibility of wiring to the switch is high, and visual confirmation of the switch detection operation linked to the wiring of each switch and the state of the detection target can be easily performed. It was possible to make it advantageous.

  FIG. 1 shows an overall side surface of a riding-type grass mower as an example of a riding-type working machine, and FIG. 2 shows an overall plane thereof. The riding-type grass mower is located at the front portion of the traveling machine body 1. Between a pair of left and right caster-type front wheels 2 arranged to freely follow and steer around a longitudinal axis, and a pair of left and right rear wheels 3 arranged as propulsion wheels at the rear of the traveling machine body 1, a mower (working device) An example) It is configured in a mid-mount type in which 4 is connected to be vertically movable.

  As shown in FIGS. 1 to 4, the traveling machine body 1 has a gasoline engine 5 mounted on the rear part thereof, and the power from the engine 5 is transmitted to the input shaft 7 of the power distribution mechanism 6 arranged in front of the lower part thereof. The driving power transmitted from the input shaft 7 to the left and right hydrostatic continuously variable transmissions (an example of a transmission) 9 via a pair of bevel gears 8, and a large amount of power from the input shaft 7 via a pair of spur gears 10. Branching to the working power transmitted to the plate-type working clutch 11, the traveling power is transmitted from the left and right hydrostatic continuously variable transmissions 9 to the corresponding rear wheels 3 via the speed reduction mechanism 12, The working power is transmitted from the work clutch 11 to the input unit 15 of the mower 4 through the power take-out shaft 13 and the transmission shaft 14.

  A driver's seat 16 is provided in front of the engine 5 in the traveling machine body 1 and a protective frame 17 is erected. The corresponding hydrostatic continuously variable transmission 9 is shifted on the left and right of the driver's seat 16. A shift lever (an example of a shift operation tool) 18 is provided.

  In other words, in this mower, the driving power from the engine 5 is transmitted to the left and right rear wheels 3 via the corresponding hydrostatic continuously variable transmissions 9 on the left and right sides so that they can be independently shifted and can be switched between forward and reverse rotations. By operating the left and right shift levers 18 and independently operating the corresponding hydrostatic continuously variable transmission 9 to stop transmission to the left and right rear wheels 3, the left and right rear wheels 3 Stop the transmission to one of the left and right rear wheels 3, the straight traveling state that transmits constant forward power or reverse power, the slow turning state that transmits different forward power or backward power to the left and right rear wheels 3, In addition, a pivot turning state in which forward power or reverse power is transmitted to the other and a spin turning state in which forward power is transmitted to one of the left and right rear wheels 3 and reverse power is transmitted to the other can be realized. .

  A clutch lever 19 for switching the operating state of the work clutch 11 is provided behind the right speed change lever 18 in the traveling machine body 1. The clutch lever 19 is operated so that the work clutch 11 is operated from the engine 5. By switching to the non-transmission state where the working power is not transmitted to the input section 15 of the mower 4, the non-working state in which the mower 4 is deactivated can be revealed, and the working power from the engine 5 can be displayed. By switching to the transmission state transmitted to the input unit 15, the work state in which the mower 4 is operated can appear.

  Each of the left and right speed reduction mechanisms 12 incorporates a multi-plate brake 21 for braking the corresponding rear wheel 3 by braking the output shaft 20 of the corresponding hydrostatic continuously variable transmission 9. Is linked to a single brake pedal (an example of a brake operating tool) 22 arranged at the front left and right center of the traveling machine body 1 and depresses the brake pedal 22 against a return bias by a tension spring (not shown). By operating, a braking state in which the left and right brakes 21 brake the left and right rear wheels 3 can appear.

  The brake pedal 22 can be engaged and held at a braking position where the left and right brakes 21 are braked by operating a lock pedal 23 disposed adjacent to the left side of the brake pedal 22. Thus, the left and right brakes 21 can function as parking brakes.

  Note that the engagement and holding of the brake pedal 22 by the lock pedal 23 is configured to be released by a depressing operation of the brake pedal 22.

  The mower 4 has three blades 26 for mowing inside a housing 25 supported so as to be able to be lifted and lowered by a traveling mechanism 1 via a link mechanism 24, and an axial center thereof via a vertical rotation shaft 27. The working power that is installed in a state of being integrally rotated around and transmitted to the input unit 15 is transmitted to each rotary shaft 27 via the belt-type transmission mechanism 28 and the like, whereby grass by rotation of each blade 26 is obtained. It is configured as a side discharge type that cuts grass and discharges cut grass in the housing 25 from a discharge port 29 formed at the right end thereof by conveying wind generated by the rotation thereof.

  As shown in FIGS. 1 to 5, the traveling machine body 1 includes two shift switches 30 that detect whether the left and right corresponding hydrostatic continuously variable transmissions 9 are in a neutral state, and a work clutch 11 that is in a transmission state. A work switch 31 for detecting whether or not the driver is seated, a seat switch 32 for detecting whether or not the driver is seated on the driver's seat 16, and a brake switch 33 for detecting whether or not the left and right brakes 20 are in a braking state. , Etc. are equipped.

  Each shift switch 30 is composed of a momentary double switch having a normally open first contact 30a and a second contact 30b arranged in the vicinity of the corresponding shift lever 18, and the corresponding shift lever 18 is neutral. When it is operated to the position, it is pressed by the speed change lever 18 to switch the contacts 30a, 30b to the closed state, and when the corresponding speed change lever 18 is operated to the traveling position deviated from the neutral position, The pressing operation by the transmission lever 18 is released, and the contacts 30a and 30b are returned to the open state.

  The work switch 31 is a normally open momentary switch disposed in the vicinity of the clutch lever 19, and when the clutch lever 19 is operated to the cut position for switching the work clutch 11 to the non-transmission state, the clutch When the lever 19 is pressed to switch to the closed state, and when the operating clutch 11 is operated to the transmission position for switching to the transmission state, the pressing operation by the clutch lever 19 is released to return to the open state.

  When the driver arrives at the driver's seat 16 when the driver arrives at the driver's seat 16, the seat switch 32 is composed of a momentary-type dual switch having a normally-open first contact 32a and a second contact 32b arranged below the driver's seat 16. When the driver seat 16 is depressed against the bias of the outer compression spring, the contacts 32a and 32b are switched to the closed state, and when the operator leaves the driver seat 16, the compression spring is biased. The pressing operation is released when the driver seat 16 is lifted, and the contacts 32a and 32b are returned to the open state.

  The brake switch 33 is composed of a momentary double switch having a normally-closed first contact 33a and a normally-open second contact 33b arranged in the vicinity of the brake pedal 22, and the brake pedal 22 is in a braking position. When the stepping operation is performed, the pressing operation by the brake pedal 22 is released, the first contact 33a is closed, the second contact 33b is returned to the open state, and the brake pedal 22 is released from the stepping operation. When the brake release position is restored, the first contact 33a is switched to the open state and the second contact 33b is switched to the closed state by being pressed by the brake pedal 22.

  The shift switch 30, the work switch 31, the seat switch 32, and the brake switch 33 are not affected by rain water or mud splashing by the wheels 2 and 3, and the driver seat 16, the boarding step 34, the left and right fenders 35, and the like. Since it is disposed at a relatively high position in the covered traveling machine body 1 and at a position relatively distant from each wheel 2, 3, a non-waterproof and inexpensive one is employed.

  As shown in FIG. 5, the traveling machine body 1 is provided with a control circuit 36 for starting and stopping the engine 5. In this control circuit 36, an anode of a battery 37 provided in the traveling machine body 1 is connected via an electric wire 38 and the like. The starter 39 is connected in parallel to the contact 39a of the starter relay 39B for switching the energization state to the starter motor 39A, the B terminal of the key switch 40 serving as the main switch of the traveling machine 1, and the like.

  In the key switch 40, five current paths 41 to 45 are connected in parallel to the L terminal connected to the B terminal in accordance with the operation to the ON position, and in accordance with the operation to the start position. A contact 46a of the first relay switch 46 that switches the energization state to the relay coil 39b that opens and closes the contact 39a of the starter relay 39B is connected to the S terminal connected to the B terminal via an electric wire 47 or the like.

  In the first energization path 41, the work switch 31, the first contact 30 a of the two shift switches 30, the first contact 33 a of the brake switch 33, and the first of the seat switch 32 are connected via the electric wire 48. The contact 32a and the relay coil 46b of the first relay switch 46 are connected in series in that order from the L terminal side of the key switch 40.

  In the second energizing path 42, the second contact 32 b of the seat switch 32 and the relay coil 50 b of the second relay switch 50 are connected in series in this order from the L terminal side of the key switch 40 through the electric wire 49 and the like. ing.

  In the third current path 43, the contact 50 a of the second relay switch 50, the contact 52 a of the third relay switch 52, and the relay coil 53 b of the fourth relay switch 53 are connected to the key switch 40 via the electric wire 51 and the like. Are connected in series in that order from the L terminal side.

  In the fourth energization path 44, the B terminal of the delay relay 55 is connected via an electric wire 54 and the like, and in the fifth energization path 45, the second contact 33b of the brake switch 33 and the delay relay are connected via an electric wire 56 and the like. The second contact 30b of the two shift switches 30 and the delay relay 55 via the first energization path 45A that connects the C terminal of the 55 in series in that order from the L terminal side of the key switch 40, the electric wire 57, and the like. Are connected in series in that order from the L terminal side of the key switch 40 to the C terminal.

  The delay relay 55 has an L terminal connected to the relay coil 52b of the third relay switch 52 via an electric wire 58, and the third relay switch from the L terminal to the energization of both the B terminal and the C terminal. The energization of the relay coil 52b of the second relay switch 52 is stopped, and the energization of the relay coil 52b of the third relay switch 52 is stopped from the L terminal as the energization of the C terminal is stopped.

  As the first relay switch 46 is energized to the relay coil 46b, the contact 46a is switched to a closed state allowing the starter relay 39B to be energized to the relay coil 39b, and the energization of the relay coil 46b is stopped. Thus, the contact 46a is switched to an open state in which the energization to the relay coil 39b of the starter relay 39B is blocked.

  As the second relay switch 50 energizes the relay coil 50b, the contact 50a switches to a closed state that allows the third relay switch 52 to energize the contact 52a, and the energization of the relay coil 50b is stopped. Along with this, the contact 50a is switched to an open state that prevents the third relay switch 52 from energizing the contact 52a.

  As the third relay switch 52 energizes the relay coil 52b, the contact 52a switches to a closed state that allows energization of the relay coil 53b of the fourth relay switch 53 and the fuel solenoid 59, As the energization of the relay coil 52b is stopped, the contact 52a is switched to an open state in which the energization of the relay coil 53b of the fourth relay switch 53 and the fuel solenoid 59 is blocked.

  As the fourth relay switch 53 is energized to the relay coil 53b, the contact 53a is switched to an open state in which the ground for the ignition coil of the engine 5 is released, and the energization to the relay coil 53b is stopped. The contact 53a switches to an open state in which the ignition coil is grounded.

  The fuel solenoid 59 switches the fuel supply state of the fuel valve 60 to the engine 5 and is energized by energization to allow fuel supply to the engine 5 by the fuel valve 60 and demagnetized by deenergization. The fuel supply to the engine 5 by the fuel valve 60 is blocked.

  Then, from between the first contact 33a of the brake switch 33 and the first contact 32a of the seat switch 32 in the first energization path 41, the second contact 32b of the seat switch 32 and the second relay switch 50 in the second energization path 42. The work switch 31 connected in series in the first energization path 41, the first contact 30 a of the two shift switches 30, and the first contact 33 a of the brake switch 33 are connected to the relay coil 52 b of the seat switch 32. An electric wire 61 connected to the relay coil 50b of the second relay switch 50 is installed in parallel with the second contact 32b, and the electric current from the first energization path 41 to the second energization path 42 is allowed to the electric wire 61. A diode 62 that prevents energization from the second energization path 42 to the first energization path 41 is interposed.

  From the circuit configuration described above, as shown in FIG. 6, as shown in FIG. 6, a seated state where seating on the driver's seat 16 is detected by the seat switch 32, or left and right hydrostatic continuously variable transmissions 9 by the two shift switches 30. When the neutral state is detected, the non-transmission state of the work clutch 11 is detected by the work switch 31, and the complete stop state is detected in which the brake state of each of the left and right brakes 21 is detected by the brake switch 33, the key switch 40 Energization from the L terminal to the relay coil 50b of the second relay switch 50 and the relay coil 52b of the third relay switch 52 via the delay relay 55 is allowed. In this state, the key switch 40 is turned on. When the B terminal and the L terminal are connected by operating to the position, the contact 50 of the second relay switch 50 is connected from the L terminal of the key switch 40. And the relay coil 53b of the fourth relay switch 53 and the fuel solenoid 59 are energized through the contact 52a of the third relay switch 52, etc., and the contact 53a of the fourth relay switch 53 is opened to release the grounding to the ignition coil. The fuel solenoid 59 is excited and the fuel valve 60 allows fuel supply to the engine 5 by switching.

  However, in this state, the relay coil 46b of the first relay switch 46 is not energized, and the contact 46a remains open to prevent the starter relay 39B from energizing the relay coil 39b. Even if the switch 40 is operated to the start position and the B terminal is connected to both the L terminal and the S terminal, the starter motor 39A is prevented from being energized while the contact point 39a of the starter relay 39B remains open. The engine 5 cannot be started by driving the starter motor 39A.

  On the other hand, the neutral state of the left and right hydrostatic continuously variable transmissions 9 is detected by the two shift switches 30, the non-transmission state of the work clutch 11 is detected by the work switch 31, and the driver switch 16 is connected to the driver seat 16 by the seat switch 32. When seating is detected and a seating complete stop state is detected in which the brake state of each of the left and right brakes 21 is detected by the brake switch 33, the relay coil 46b of the first relay switch 46, the second Energization of the relay coil 50b of the relay switch 50 and the relay coil 52b of the third relay switch 52 via the delay relay 55 is allowed. In this state, the key switch 40 is operated to the ON position. When the B terminal and the L terminal are connected, the relay coil of the first relay switch 46 is connected from the L terminal of the key switch 40. 46b is energized, and its contact 46a is switched to a closed state allowing energization to the relay coil 39b of the starter relay 39B, and via the contact 50a of the second relay switch 50, the contact 52a of the third relay switch 52, etc. Thus, the relay coil 53b of the fourth relay switch 53 and the fuel solenoid 59 are energized, the contact 53a of the fourth relay switch 53 is switched to an open state for releasing the grounding to the ignition coil, and the fuel solenoid 59 is excited. The fuel supply to the engine 5 by the fuel valve 60 is allowed.

  In this state, when the key switch 40 is operated to the start position and the B terminal is connected to both the L terminal and the S terminal, the relay coil 39b of the starter relay 39B is connected via the contact 46a of the first relay switch 46 and the like. And the contact point 39a of the starter relay 39B is switched to a closed state in which the starter motor 39A is energized, so that the engine 5 can be started by driving the starter motor 39A.

  That is, the two shift switches 30, the work switch 31, the seat switch 32, the brake switch 33, and the first relay switch 46 allow the operator to sit on the driver's seat 16, and the left and right hydrostatic continuously variable transmissions 9 and A start check means 63 that allows the engine 5 to start only in the seating complete stop state in which the vehicle 21 is prevented from traveling by the brake 21 and the mower 4 is prevented from being driven by the work clutch 11 is configured. The operator moves away from the driver's seat 16 while having a low-cost configuration that is not expensive and is not required to use a control device composed of a microcomputer that is restricted by switches and the like used for protection thereof and requires high attention. It is possible to prevent the engine 5 from being started while the engine is being Inconvenience and mower 4 the aircraft to start is able to avoid the occurrence of inconvenience to operate.

  In this control circuit 36, the non-neutral state of the left and right hydrostatic continuously variable transmission 9 is detected by one or both of the two shift switches 30, while the left and right brakes 21 are detected by the brake switch 33. When a running braking state is detected in which the braking state is detected, energization to the C terminal of the delay relay 55 is stopped, and when this state continues for a predetermined time (for example, 3 seconds), a delay occurs. The energization from the relay 55 to the relay coil 52b of the third relay switch 52 is stopped, and the contact 52a is switched to an open state in which the energization to the relay coil 53b and the fuel solenoid 59 of the fourth relay switch 53 is stopped. In conjunction with this, the contact 53a of the fourth relay switch 53 switches to a closed state in which the ignition coil is grounded, and the fuel solenoid 59 is turned off. By supply of fuel to the engine 5 by the fuel valve 60 is to be stopped.

  That is, the brake pedal 22 is moved to the braking position where the left and right brakes 21 are braked by, for example, the lock pedal 23 by the two shift switches 30, the brake switch 33, the third relay switch 52, the fourth relay switch 53, and the delay relay 55. After the engine 5 is started and the engine 5 is started, either of the left and right speed change levers 18 is forgotten in the state where the lock pedal 23 forgets the release operation of releasing the engagement at the braking position of the brake pedal 22. Alternatively, braking is performed by an inappropriate operation such as operating both from a neutral position and switching either or both of the left and right hydrostatic continuously variable transmissions 9 to a non-neutral state (traveling shift state) to cause the vehicle to travel. When the running state appears and the state continues for a predetermined time, the ignition coil is grounded, and fuel is supplied to the engine 5. The engine delay stop means 64 is configured to stop the engine 5 and stop the engine 5, whereby the hydrostatic continuously variable transmission 9, the brake 21, Therefore, it is possible to prevent the hydrostatic continuously variable transmission 9 and the brake 21 from becoming short-lived, for example, the brake 21 is seized against each other.

  In addition, since a predetermined period of time is provided from when the braking travel state appears until the engine 5 stops, the driver notices the appearance of the braking travel state during the predetermined time, and the brake pedal 22 The engine 5 is released by performing an appropriate avoiding operation such as releasing the braking of the brake 21 by operating or shifting the left and right hydrostatic continuously variable transmission 9 by operating the left and right shifting levers 18. Thus, the operation can be continued without stopping the operation, and the trouble of restarting the engine 5 can be saved.

  Further, in this control circuit 36, the seat switch 32 detects the withdrawal from the driver's seat 16, while the left and right hydrostatic continuously variable transmission 9 is not operated by one or both of the two shift switches 30. When a neutral state, a non-sitting incompletely stopped state in which any one of the transmission state of the work clutch 11 by the work switch 31 and the non-braking state of the left and right brakes 21 by the brake switch 33 is detected appears. The energization of the relay coil 50b of the second relay switch 50 is stopped, and the contact 50a is switched to an open state in which the energization of the contact 52a of the third relay switch 52 is stopped, whereby the fourth relay switch 53, the energization of the relay coil 53b and the fuel solenoid 59 is stopped, and the contact 53a of the fourth relay switch 53 is ignited. It switched to the closed state grounding the-yl, and the fuel solenoid 59 so that the fuel supply to the engine 5 by being demagnetized fuel valve 60 is stopped.

  That is, one or both of the left and right hydrostatic continuously variable transmissions 9 are in a non-neutral state by the two shift switches 30, work switch 31, seat switch 32, brake switch 33, second relay switch 50, and diode 62. The driver leaves the driver seat 16 in spite of the traveling state switched to, the working state in which the work clutch 11 is switched to the transmission state, and the incomplete stop state in which braking by the left and right brakes 21 is released. An engine stop means 65 is configured to stop the engine 5 by grounding the ignition coil and stopping the fuel supply to the engine 5 when the incomplete seating stop state appears. Inconvenience that the traveling body 1 travels in a non-sitting state of the operator and the mower There is possible to avoid the occurrence of an inconvenience to operate.

[Another Example]
Other embodiments of the present invention will be listed below.
[1] The riding work machine may be a tractor, a rice transplanter, or the like.

[2] The transmission 9 may include a single hydrostatic continuously variable transmission or gear transmission.

[3] The engine stop means 65 may be provided with a delay relay that allows the operator to re-seat the driver's seat 16.

[4] The brake 21 may be configured such that the left and right propulsion wheels 3 can be independently braked.

[5] The transmission switch 30 may be provided at a position where the operation state of the transmission 9 is directly detected from the transmission 9.

[6] The work switch 31 may be provided at a position where the operation state of the work clutch 11 is directly detected from the work clutch 11.

[7] The brake switch 33 may be provided at a position where the operation state of the brake 21 is directly detected from the brake 21.

Overall side view of riding mower Overall plan view of the riding mower Partial longitudinal rear view of the main part showing the transmission configuration of a riding mower Longitudinal side view of the main part showing the transmission configuration of the riding mower Circuit diagram showing the configuration of the control circuit Diagram showing the relationship between the engine and each switch

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling machine body 3 Propulsion wheel 4 Working device 5 Engine 9 Transmission device 11 Working clutch 16 Driving seat 21 Brake 30 Shifting switch 31 Working switch 32 Seat switch 33 Brake switch 46 Relay switch 50 Relay switch 52 Relay switch 53 Relay switch 55 Delay relay 63 Start check means 64 Engine delay stop means 65 Engine stop means

Claims (3)

A work device is connected to a traveling machine body provided with a driver's seat, and a transmission for shifting power from the engine transmitted to the left and right propulsion wheels, a brake for braking the left and right propulsion wheels, and the work from the engine An engine operation restriction structure for a riding-type work machine equipped with a work clutch that switches a transmission state to the device,
A shift switch for detecting whether or not the transmission is in a neutral state; a brake switch for detecting whether or not the brake is in a braking state; a work switch for detecting whether or not the work clutch is in a transmission state; and the driver's seat The shift switch detects a neutral state of the transmission, from a seat switch that detects whether or not the seat is in a seating state, and a relay switch that switches an energized state between a state in which the engine is allowed to start and a state in which the engine is blocked. When the brake switch detects a braking state of the brake, the work switch detects a non-transmission state of the work clutch, and the seat switch detects a seating state, a start check means that allows the engine to start The engine operation regulation structure of the riding type work machine which is configured.   A relay switch for switching an energized state between a state in which the operation of the engine is continued and a state in which the engine is stopped; the relay switch, the shift switch, the brake switch, the work switch, and the seat switch; The seat switch in any of the following states: detection of a non-neutral state of the transmission, detection of a non-braking state of the brake by the brake switch, and detection of a transmission state of the work clutch by the work switch The engine operation restricting structure for a riding work machine according to claim 1, wherein engine stop means is configured to stop the engine when detecting a retracted state.   A relay switch that switches an energized state between a state in which the operation of the engine is continued and a state in which the engine is stopped, and a delay relay that delays switching to the stopped state by the relay switch, these relay switch and delay relay, and When the shift switch detects a non-neutral state of the transmission and the brake switch detects the brake state of the brake for a predetermined time from the shift switch and the brake switch, the engine is The engine operation restricting structure for a riding work machine according to claim 1 or 2, wherein engine delay stop means for stopping is configured.

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