JPH0728723U - Operation control device for riding type work machine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an operation control device for a riding type work machine capable of more detailed operation control required depending on the usage pattern of the work machine. [Configuration] In a riding type work machine, the power source is stopped when the seat switch 13 detects a leaving state for a predetermined time while the parking brake switch 12 detects that the parking brake is off while the power source is being driven. The electromagnetic clutch 20 can be engaged by operating the PTO switch 8 only when the power source control means and the seat switch 13 detect a seated state, and the seat switch 13 is released when the electromagnetic clutch 20 is engaged. PT when seat condition is detected
An operation control device for a riding type work machine, comprising: an electromagnetic clutch control means for immediately disconnecting the electromagnetic clutch 20 regardless of the operation of the O switch 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an operation control device for a riding-type working machine equipped with, for example, a lawn mowing cutter, a rotary tiller, a snow blower, etc. and driven by a power source such as an engine.

[0002]

[Prior art]

 Conventionally, in the case of the riding type work machine as described above, in consideration of the work situation, the operator is sitting in the driver's seat or the power source such as the engine is automatically stopped according to the connection state of various power systems. Alternatively, there was an interlock mechanism that prevents the power source from starting (Japanese Patent Laid-Open No. 60-169332).

As shown in the same example, in this type of riding-type working machine, it is possible to automatically stop the power source by detecting whether or not the operator is seated, or to start the power source carelessly. It was common to configure the interlock system in relation to the power source, such as by disabling it.

By the way, if the stop and start of the power source such as the engine is directly controlled as described above, the restart operation of the power source is frequently performed depending on the work mode, which may be troublesome. In some circumstances, it may not be desirable to directly control the operating state of the power source, for example, when the operator leaves the seat and wants to stop only the drive of the work machine without stopping the power source.

On the other hand, the applicant of the present invention, in the previous application (Japanese Patent Application No. 62-257257, Japanese Patent Laid-Open No. 1-101235), has an electromagnetic clutch in the power transmission path from the engine of the power source to the working machine. We have proposed an operation control device configured to intervene and stop only the working machine without stopping the engine as required, or to maintain the stopped state.

[0006]

[Problems to be solved]

 In this example, when the worker leaves the driver's seat for a predetermined time while the work machine is operating, the power source engine is not stopped and power transmission to the work machine is cut off. Although the clutch is configured to be maintained in a stopped state, further work control is required depending on the usage of the work equipment.

The present invention relates to an improvement in such a point, and an object thereof is to provide an operation control device for a riding type work machine capable of more detailed operation control required depending on a usage pattern of the work machine. It is in.

[0008]

[Means and Actions for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a seat switch for detecting whether or not a worker is seated, and an electromagnetic clutch for connecting / disconnecting power transmission to a working machine from a power source for traveling that also drives the working machine. In a riding type work machine comprising a PTO switch for operating the electromagnetic clutch, and a parking brake switch for detecting an operating state of the parking brake, the parking brake switch is operated by the parking brake switch while the power source is being driven. Power source control means for stopping the power source when the seat switch detects a state of leaving the seat for a predetermined time in a state where the seat switch is detected, and the seat switch detects the seated state. The electromagnetic clutch can be connected by operating a PTO switch, and the electromagnetic clutch is in the connected state. Switch is in when it detects a Walkaway was the apparatus for controlling the operation of the riding working machine and an electromagnetic clutch control means for interrupting immediately the electromagnetic clutch regardless operation of the PTO switch.

The power source is stopped when the seat switch detects a state of leaving the seat for a predetermined time while the power source is being driven and the parking brake is not operated. Therefore, when the worker does not show the intention to continue driving (parking The power source itself can be stopped when leaving the seat without operating the brakes), and the electromagnetic clutch can be disengaged, for example, if necessary, without stopping the power source while the worker is acting on his / her own will. By doing so, it is possible to configure so that the transition to the operation for the next work can be performed easily and smoothly.

A second invention is to make it possible to connect the electromagnetic clutch only when it is detected by the reverse switch that the vehicle is not in the reverse drive state, prohibiting the drive of the work machine in the reverse drive state in preference to all control operations. can do.

According to a third aspect of the invention, braking can be applied in conjunction with the disengagement operation of the electromagnetic clutch, so that even a working machine having a large inertial force can be quickly stopped.

[0012]

【Example】

 An embodiment of the present invention shown in FIGS. 1 to 8 will be described below. FIG. 1 is a side view of a riding type work machine 1 according to the present embodiment.

The engine 2 is mounted on the front part of the vehicle body, and the driver's seat 3 is located behind it. The riding type work machine 1 is provided with a steering wheel 4, a shift lever 5, a clutch pedal 6, a parking brake lever 7 for parking, and the like as traveling driving operation members.

At the bottom center of the body of the riding type working machine 1, a lawn mowing cutter blade 15 housed in a lawn mowing cutter housing is equipped as a working machine, and the power of the engine 2 is transmitted via an electromagnetic clutch 20. The cutter blade 15 is transmitted to or cut off from the cutter blade 15, and the PTO switch 8 that can operate the energization of the electromagnetic clutch 20 is also provided on the instrument panel in front of the driver's seat.

The shift lever 5 is a main gear shift lever for traveling, but when the shift lever 5 is in the neutral position, the traveling drive system from the engine 2 to the rear wheels 9 is cut off. When the clutch pedal 6 is depressed, a traveling clutch (not shown) is disengaged and the traveling drive system is disengaged.

In this riding type work machine 1, a control circuit 10 of an operation control device according to the present invention is incorporated in an instrument panel. Various detecting means forming a part of the control circuit 10 are arranged in each part of the machine body.

That is, the neutral switch 11 is provided at a predetermined position of the shift lever 5, and when the shift lever 5 is in the neutral position, it is turned on and the neutral state can be detected. A parking brake switch 12 is provided at a predetermined position of the parking brake lever 7 and is turned on when the parking brake lever 7 is locked. A seat switch 13, which is an on / off switch, is built in the seating portion of the driver's seat 3 and is turned on when an operator is seated and turned off when the operator leaves the driver's seat 3.

The structure of the electromagnetic clutch 20 that joins and blocks the power transmission from the engine 2 to the cutter blade 15 will be briefly described with reference to FIG. An intermediate shaft 23, which penetrates the center of the bowl-shaped case 21 via a bearing 22, is a shaft that is constantly rotated with the engine 2 by transmitting the power of the engine 2, and the rotor 24 is fitted to the intermediate shaft 23. Rotate together.

An electromagnetic coil 25 is wound inside the bowl of the case 21, and the disk portion of the rotor 24 is arranged to face the coil 25. A part of the case 21 extends outward in the centrifugal direction to form a flange 21a.The brake plate 27 is fixed to the flange 21a with the permanent magnet 26 sandwiched between the inner peripheral portion of the brake plate 27 and the flange 21a. A predetermined gap 28 is formed between them.

On the other hand, a pulley 31 is rotatably supported at a tip end portion of the intermediate shaft 23 via a bearing 30, and a hollow disc-shaped armature 33 is attached to an inner peripheral portion 31 a of the pulley 31 via a strap plate 32. The armature 33 is provided so as to face the disk portion of the rotor 24, and the outer peripheral portion of the armature 33 is located in the gap 28 between the flange 21a of the case 21 and the brake plate 27. The armature 33 is axially movable by the strap plate 32, but rotates together with the pulley 31.

The electromagnetic clutch 20 has the above-described structure, and when no current is flowing through the coil 25, the magnetic force of the permanent magnet 26 acts on the armature 33 via the brake plate 27 to move the armature 33 to the intermediate position. Moves in the direction of the tip of the shaft 23, adsorbs part of the outer periphery of the armature 33 to the brake plate 27 and fixes the armature 33 integrally with the case 21, and the rotation of the rotor 24 is not transmitted to the pulley 31 and is blocked. It is in.

When an electric current flows through the coil 25, the magnetic force acts on the armature 33 via the rotor 24 and is stronger than the permanent magnet 26, so the armature 33 is attracted to the rotor 24, so that the rotation of the rotor 24 is reduced by the pulley. It is transmitted to 31 and is in a joined state.

When the electromagnetic clutch 20 is in the engaged state, the power of the engine 2 is transmitted to the cutter blade 15 via the transmission belt wound around the pulley 31, and the cutter blade 15 is driven in the engaged state of the electromagnetic clutch 20. When the current to the coil 25 is stopped while the armature 33 is released, the armature 33 is released from the rotor 24 and is attracted to the brake plate 27 side by the permanent magnet 26. By being attracted to the brake plate 27, the rotation of the pulley 31 is braked, so that when the electromagnetic clutch 20 is disengaged, the cutter blade 15 immediately exerts a braking force and can be quickly stopped.

FIG. 3 shows a control circuit diagram of an operation control device including the various detecting means 11, 12, 13 and the PTO switch 8 including the electromagnetic clutch 20. The battery 40 is connected to one of the normally open relay contacts 41a of the relay switch 41 and also to the BAT terminal of the combination switch 42. The other contact of the relay contact 41a is connected to the starting motor 43.

In addition to the BAT terminal, the combination switch 42 has a total of 6 terminals including an E terminal, an IG terminal, an LO terminal, an ST1 terminal, and an ST2 terminal, and predetermined terminals are connected to each other by switch switching operation. To be done.

There are three types of switch switching modes: OFF, ON, and ST, and the respective terminal connection states are as shown in FIG. That is, only the IG terminal and the E terminal are connected in the OFF mode, only the BAT terminal and the LO terminal are connected in the ON mode, and the ST1 terminal and the ST2 terminal are connected in addition to the connection of the BAT terminal and the LO terminal in the ST mode.

The ST2 terminal of the combination switch 42 is connected to the relay coil 41b to which one end of the relay switch 41 is grounded. The E terminal of the combination switch 42 is grounded, the IG terminal is connected to the self-trigger ignition device (TR.MAG) 44, and the common terminal 45c is connected to one NC terminal 45b of the relay switch 45 which is grounded. There is.

The LO terminal of the combination switch 42 is connected to the upstream terminals of the parking brake switch 12 and the seat switch 13, and the downstream terminal of the seat switch 13 is connected to the relay coil 45d of the relay switch 45 via the diode 46. Has been done.

On the other hand, the PTO switch 8 comprises a pair of interlocking changeover switches 8 _X and 8 _Y, and the downstream terminal of the seat switch 13 is connected to a common terminal 8 _Xc of the changeover switch 8 _X via a diode 47. In addition, it is directly connected to the terminal 8 _Yb of the other changeover switch 8 _Y. The downstream terminal of the parking brake switch 12 is connected to the common terminal 8 _Xc of the changeover switch 8 _X.

The other terminal 8 _Ya of the changeover switch 8 _Y is connected to the coil 25 of the electromagnetic clutch 20, and the other end of the coil 25 is grounded. The common terminal 8 _Yc of the changeover switch 8 _Y is connected to the relay coil 49 _d of the relay switch 49 and also connected to the NO terminal 49 a of the relay switch 49. The common terminal 49c of the relay switch 49 is connected to the downstream terminal of the seat switch 13.

The ST1 terminal of the combination switch 42 is connected to the upstream terminal of the neutral switch 11 and to the downstream terminal of the seat switch 13 via the diode 48. The downstream terminal of the neutral switch 11 is connected to the terminal 8 _Xb of the changeover switch 8 _X of the PTO switch 8, and the other terminal 8 _Xa of the changeover switch 8 _X is connected to the relay coil 45 d of the relay switch 45.

The control circuit 10 is configured as described above, and its operation will be described below. When the combination switch 42 is in the OFF mode, the IG terminal is grounded and the ignition device 44 is grounded, and the power from the battery 43 is not supplied to any circuit.

When the combination switch 42 is switched to the ST mode here, the BAT terminal and the LO terminal and the ST1 terminal and the ST2 terminal are connected, but the operator is seated in the driver's seat 3 and the seat switch 13 is turned on or turned on. If the parking brake lever 7 is parked and the parking brake switch 12 is on or at least one is on and the shift lever 5 is in neutral and the neutral switch 11 is not on, the relay No current flows in the relay coil 41b of the switch 41, and therefore the relay contact 41a is not turned on and the starting motor 43 cannot be driven.

FIG. 5 is a control circuit diagram showing the state when the engine is started. With the shift lever 5 being neutral and the parking brake being locked, the operator sits in the driver's seat 3 and sets the combination switch 42 in the ST mode. The state is switched to.

The current of the battery 40 is connected to the common terminal 8 _Xc and the terminal 8 _Xb of the PTO switch 8 which is joined in a stopped state from the LO terminal of the combination switch 42 via the parking brake switch 12 (and the seat switch 13). Since it passes through the neutral switch 11, the ST1 terminal and the ST2 terminal and flows through the relay coil 41b of the relay switch 41 to turn on the contact 41a, a current flows through the starting motor 43 and drives the starting motor 43.

On the other hand, when the seat switch 13 is turned on, a current flows through the relay coil 45d of the relay switch 45 to connect the common terminal 45c and the NO terminal 45a to enable the ignition device 44, so that the engine 2 operates the drive motor 43. When the engine is forcibly rotated by driving and exceeds the number of revolutions at which the ignition energy is sufficiently obtained, the self-trigger ignition device 44 starts the ignition operation and the engine 2 is started. The rotation speed of the engine 2 during normal operation is controlled to 3600 rpm by a governor (not shown), and if the rotation speed is about 700 rpm or more, the ignition device 44 can operate with sufficient ignition energy.

If the relay coil 45d is excited and the common terminal 45c is connected to the NO terminal 45a while the seat switch 13 is turned on, the connection between the common terminal 8 _Yc and the terminal 8 _Yb of the PTO switch 8 is made. Since current flows through the relay coil 49d of the relay switch 49 via the common terminal 49c and the NO terminal 49a, current flows directly through the relay coil 49d without passing through the PTO switch 8 and the common terminal 49c and NO terminal. Connection with 49a is maintained.

After the engine 2 is started, the combination switch 42 is switched to the ON mode, the parking brake lever 7 is operated to release the parking brake, and the shift lever 5 is operated from neutral to forward to travel forward. A control circuit diagram in this traveling state is shown in FIG. The neutral switch 11 and the parking brake switch 12 are off, and the common terminal 49c of the relay switch 49 is connected to the NO terminal 49a.

When the worker turns on the PTO switch 8 while seated, the seat switch 13 connects the common terminal 49c and the NO terminal 49a and the common terminal 8 _Yc and the terminal 8 _Ya as shown in FIG. After that, an electric current flows through the coil 25 of the electromagnetic clutch 20, the power is transmitted to the cutter blade 15 to start rotation, and the cutter blade 15 can perform lawn mowing work.

However, when the operator is away from the driver's seat 3, the sheet switch 13 is turned off to cut off the current supplied to the common terminal 49 via the sheet switch 13, so that the PTO switch 8 is turned on. Also, no current flows through the electromagnetic clutch 20 and remains in the disconnected state.

That is, only when the operator is seated and the seat switch 13 is turned on, the electromagnetic clutch 20 can be engaged / disengaged by operating the PTO switch 8. Therefore, it is constructed so that the worker can always perform lawn mowing work while seated.

Next, when the worker leaves the driver's seat 3 during traveling work (parking brake switch 12 is off) in the state shown in FIG. 7, the seat switch 13 is turned off, and the relay switch is turned off. Since no current flows through the relay coil 45d of 45, the connection of the common terminal 45c of the relay switch 45 is switched from the NO terminal 45a to the NC terminal 45b. Therefore, although the ignition device 44 is grounded and misfires and the engine 2 tries to stop, the engine 2 does not stop immediately because of the rotational inertia, and the rotation speed gradually decreases.

On the other hand, as the relay switch 45 is switched, the connection between the common terminal 49c and the NO terminal 49a of the relay switch 49 is cut off, so that no current flows through the coil 25 of the electromagnetic clutch 20. At the same time as 20 cuts off the power transmission to the cutter blade 15, the braking force is applied to the pulley 31 of the electromagnetic clutch 20 as described above, so that the cutter blade 15 immediately stops.

However, when the time when the worker leaves the driver's seat 3 is a short time (within 2 to 3 seconds) such as temporary floating of the waist, when the seat switch 13 is turned on by sitting, the relay switch is turned on. Since the grounding of the ignition device 44 is released by the operation of 45 and it becomes operable, the ignition is restarted by the energy due to the rotational inertia of the engine 2 and the engine 2 can be operated without being stopped. By the way, in this embodiment, about 700 rmp is confirmed as the limit value, and it is possible to continue the operation without stopping the engine 2 for a short time until it decreases from 3600 rmp to 700 rmp. is there.

Therefore, when the worker leaves the driver's seat 3, the cutter blade 15 can be stopped immediately and the troublesome work of restarting the engine 2 using the starter motor 43 can be reduced as much as possible. Moreover, the life of the battery 40 can be extended.

Then, in order to restart the drive of the cutter blade 15, the electromagnetic clutch 20 is joined in a simple and reliable state by a reset operation which is a predetermined work procedure in which the PTO switch 8 is once turned off and then turned on. be able to.

Even if the PTO switch 8 is off, if the operator leaves the driver's seat 3 without the parking brake lever 7 being parked and locked, the ignition device 44 of the seat switch 13 operates in the same manner as described above. Grounded and engine 2 stops.

Next, from the state shown in FIG. 7, when the shift lever 5 is set to neutral and the neutral switch 11 is turned on, the parking brake lever 7 is locked to parking and the parking brake switch 12 is turned on, When the driver leaves the driver's seat 3 and turns off the seat switch 13, the parking brake switch 12 connects the common terminal 8 _Xc and the terminal 8 _Xa of the PTO switch 8 to the relay coil 45d of the relay switch 45 as shown in FIG. Since a current flows, the ignition device 44 is not grounded by the relay switch 45, and the operation of the engine 2 is continued.

However, since the seat switch 13 is turned off and no current flows in the relay coil 49d of the relay switch 49, the connection between the common terminal 49c and the NO terminal 49a is cut off, and the PTO switch 8 is turned on after all. However, no current flows through the coil 25 of the electromagnetic clutch 20 and power transmission to the cutter blade 15 is cut off, and the cutter plate 15 is immediately stopped by braking. In order to re-drive the cutter blade 15, it is necessary to sit on the driver's seat 3 and reset the PTO switch 8.

Further, even if the driver's seat 3 is left after stopping the drive of the cutter blade 15 by turning off the PTO switch 8 by turning the shift lever 5 into the neutral state and the parking brake lever 7 in the parking state, the parking brake switch 12 Since current flows through the neutral coil 11 and the diode 48 to the relay coil 45d of the relay switch 45 through the connection between the common terminal 8 _Xc and the terminal 8 _Xb of the PTO switch 8, the ignition device 44 is not grounded by the relay switch 45, The engine 2 can continue to operate. Even if the PTO switch 8 is turned on, the electromagnetic clutch 20 is in the disengaged state and the cutter blade 15 is not driven as in the state of FIG. 8 already described.

Next, as another embodiment, FIG. 9 shows an example in which a reverse switch 60 for detecting whether or not the shift lever 5 is in the reverse position is connected in series to the coil 25 of the electromagnetic clutch 20. The reverse switch 60 is a switch that is off when the shift lever 5 is in the reverse position and is on at other times.

Therefore, when the shift lever 5 is not in the reverse position and the reverse switch 60 is on, the electromagnetic clutch 20 can be controlled to be engaged or disengaged in the same manner as in the above embodiment, but the shift lever 5 can be controlled. When 5 is in the reverse position and the reverse switch 60 is off, the electromagnetic clutch 20 is always in the disengaged state, so power is not transmitted to the cutter blade 15 and the cutter blade 15 is stopped.

Therefore, during traveling work, when the shift lever 5 is switched from forward to reverse, the electromagnetic clutch 20 is disengaged, the cutter blade 15 is stopped, and the engine can continue to operate as it is. That is, when switching to reverse travel, only the cutter blade 15 is stopped to ensure the stopping operation of the cutter blade 15 and reduce the troublesome restarting operation of the engine as much as possible.

[0054]

[Effect of device]

 The present invention stops the power source when the seat switch is turned off for a predetermined time while the power source is being driven and the parking brake is not operating. Therefore, when the operator does not show the intention to continue driving, that is, the parking brake is activated. The power source itself can be stopped when leaving the seat without being allowed to do so, and while the worker is acting on his own will not stop the power source, for example, by disengaging the electromagnetic clutch as necessary, The transition to the operation for the next operation can be performed easily and smoothly.

According to the second invention, since the electromagnetic clutch can be engaged only when it is detected that the reverse switch is not in the reverse drive state, the driving of the working machine in the reverse drive state is prohibited in preference to all control operations. As a result, it is possible to ensure the stop operation of the working machine and reduce the troublesome engine restart operation.

According to the third aspect of the invention, the braking can be applied in conjunction with the disengagement operation of the electromagnetic clutch, so that even a working machine having a large inertial force can be quickly stopped.

[Brief description of drawings]

FIG. 1 is an overall side view of a riding type work machine including an operation control device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an electromagnetic clutch used in the riding type working machine.

FIG. 3 is a control circuit diagram of the operation control device.

FIG. 4 is a diagram showing a terminal connection state of a combination switch in a switch switching mode.

FIG. 5 is a control circuit diagram showing a state when the engine is started.

FIG. 6 is a control circuit diagram in a traveling state in which a work machine is not driven.

FIG. 7 is a control circuit diagram in a traveling work state.

FIG. 8 is a control circuit diagram when the driver leaves the seat with the parking brake activated while the work machine is being driven.

FIG. 9 is a control circuit diagram when a reverse switch is provided as another embodiment.

[Explanation of symbols]

1 ... Riding work machine, 2 ... Engine, 3 ... Driver's seat, 4 ... Steering wheel, 5 ... Shift lever, 6 ... Clutch pedal, 7 ...
Parking brake lever, 8 ... PTO switch, 10 ...
Control circuit, 11 ... Neutral switch, 12 ... Parking brake switch, 13 ... Seat switch, 15 ... Cutter blade, 20 ... Electromagnetic clutch, 21 ... Case, 22 ... Bearing, 23 ... Intermediate shaft, 24 ... Rotor, 25 ... Coil, 26 ... Permanent magnet, 27 ... Brake plate, 28 ... Gap, 30 ... Bearing, 31 ... Pulley, 32 ... Strap plate, 33 ... Armature, 40 ... Battery, 41 ... Relay switch, 42 ... Combination switch, 43 ... Starting motor, 44 ... Ignition device, 45 ... Relay switch, 46, 47, 48 ... Diode, 49
… Relay switch, 60… Reverse switch.

Claims (3)

[Scope of utility model registration request] 1. A seat switch for detecting whether or not a worker is seated, an electromagnetic clutch for connecting and disconnecting power transmission to a working machine from a power source for traveling which also drives the working machine, and the electromagnetic clutch. In a riding type work machine including a PTO switch for operating the parking brake and a parking brake switch for detecting an operating state of the parking brake, a state in which the parking brake switch detects OFF of the parking brake while the power source is being driven. The power source control means for stopping the power source when the seat switch detects the seated state for a predetermined time, and the electromagnetic clutch by operating the PTO switch only when the seat switch detects the seated state. And that the seat switch detects a state of leaving the seat while the electromagnetic clutch is in a joined state. Huang said PT
An operation control device for a riding type work machine, comprising: an electromagnetic clutch control means for immediately disconnecting the electromagnetic clutch regardless of an operation of an O switch. 2. A reverse switch for detecting a reverse drive state of the riding type work machine, wherein the electromagnetic clutch control means detects the seated state of the seat switch and the reverse switch detects a reverse drive state. The operation control device for a riding type work machine according to claim 1, wherein the electromagnetic clutch can be engaged only by operating the PTO switch when there is no such a position. 3. The operation control device for a riding type work machine according to claim 1, further comprising a braking means for braking the power transmission side in conjunction with the disconnection operation of the electromagnetic clutch.