JPS6036201A - Power extracting controller for special instrumental automobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Conventional garbage collection vehicles that extract the driving power for the garbage loading device from the engine usually carry out the garbage loading operation when the vehicle is stopped, but the garbage loading operation can be carried out while the vehicle is running at low speed. By making it possible to do this, the loading efficiency of garbage scattered along a narrow road can be improved, and traffic stagnation can be prevented. a fluid pressure supply source for actuating the travel brake; a switching device that utilizes the supply pressure to cut off and control extraction of driving power for the working device from the engine; 0 Regarding specially equipped vehicles equipped with a device that issues a signal when the vehicle is running out If the source brake operating pressure is insufficient,
This is extremely dangerous because the braking capacity of the vehicle is suddenly reduced, and the power take-off device may become partially cut off, which is likely to cause damage to its gears and gear pump. Also, if you accidentally flip the transfer switch to the on side while driving, the power take-off device will immediately switch to the connected side in the case of a car with an automatic transmission, or the power take-off device will be switched to the connected side in the case of a car with a manual transmission. If the clutch is depressed, the power take-off device will be switched to the connected side, which will cause the vehicle speed to drop suddenly and cause a rear-end collision with the following vehicle. Easy to invite.

The present invention deals with this problem. (1) When the normally open contact 6 of the keep relay 2, in which the excitation coil and the demagnetization coil are selectively brought into conduction by the changeover switch 1, is closed by the conduction of the excitation coil, The control valve 4 of the switching device is a power take-off device.

5, and a normally open contact 6 that is closed upon receiving the signal is connected between the degaussing coil and the power source in parallel with the changeover switch. power take-off control device.

(2) When the normally open contact 6 of the keep relay 2, in which the excitation coil and the demagnetization coil are selectively conducted by the changeover switch 1, is closed due to the conduction of the excitation coil, the control valve 4 of the switching device operates the power take-off device. 5, and a normally open contact 6 which is closed upon receiving the signal is connected between the degaussing coil and the power source in parallel with the changeover switch, and when the traveling transmission is in the neutral position. 1. A power extraction control device for a specially equipped vehicle, characterized in that a switch 7 is provided which closes only when the excitation coil is in the operating position, and the switch 7 is inserted in series with the changeover switch 1 into the operating circuit of the excitation coil.

The gist is:

The embodiments shown in FIGS. 1 to 4 in which the present invention is applied to a garbage collection vehicle equipped with a manual transmission and whose deceleration brake (exhaust brake) is operated by a vacuum supply source will be described below. As shown in Fig. 2, the garbage collection vehicle has a cargo box 9 equipped with a garbage loading device 8 that can be opened and closed at the rear end of the vehicle body 10, and a hydraulic pump that drives an actuator for loading and discharging garbage. 11 is driven by a power take-off shaft 13 of a power take-off device (P, T, O,) 5 installed in a manual transmission 12, and a changeover switch 1 and a clutch pedal for switching the power take-off device on and off. As before, a clutch switch 15 that closes when the clutch switch 14 is depressed (when the clutch is disengaged) is installed inside the cab 16.

Reference numeral 17 denotes an exhaust braking device (Fig. 1) mounted on the garbage collection vehicle, and the exhaust braking device 17 is a vacuum pressure supply source consisting of a vacuum pump 18 driven by a traveling engine and a master bag 19 that is evacuated by the vacuum pump 18. , a single-acting power chamber 23 containing a built-in spring that always urges the opening/closing lever 22 of the exhaust brake valve 21 provided in the engine exhaust pipe 20 to return to the valve open position shown in the figure; and the power chamber 26.
and a solenoid control valve 25 inserted into the conduit 24 between the master back 19 and the solenoid control valve 25il-1l conduit 26.
The power chamber 26 is constantly energized to return to the position where the power chamber 26 is communicated with the outside air via the air cleaner 27. Solenoid control valve 2
In the operating circuit 28 of the solenoid 25a that switches 5,
Starter switch 29. Exhaust brake activation switch 60, which closes when the brake pedal is depressed. Normally closed contact 62 of relay 61. a switch 66 that closes when the engine stops accelerating;
Switch 64 that closes when the clutch pedal 14 is depressed
are inserted in series. 65 indicates a power source.

Therefore, when the solenoid 25a is conductive, the electromagnetic control valve 25 connects the power chamber 26 to the vacuum pressure supply source (1, 8,
19), the exhaust brake valve 21 is closed by the power cylinder, and deceleration braking is performed by the exhaust brake.

66 is a reservoir tank connected to the pipe line 24 between the master bag 19 and the control valve 25, and the vacuum sensor 67 attached to the reservoir tank 66 is connected to the vacuum pressure supply source (18
, 19) decreases to such a level that the exhaust brake cannot be operated, the switch 68 closes and issues a signal.

When the switch 68 is closed, the excitation coil 69 of the relay 61
is conductive to open the normally closed contact 62, the normally open contact 4o is closed to conduct the self-holding circuit, and at the same time the buzzer 41 is conductive to notify that the exhaust brake cannot be activated.

The switching device rotates the switching lever 42 of the power take-off device 5 left and right to engage and disengage the sliding gear from the input gear via a switching shaft whose upper end is fixedly supported, and the switching device always returns the switching lever to the disconnected position shown in the figure. Single-acting power chamber 4 with built-in energizing spring
6, the power chamber and a vacuum pressure source (18,
19), an electromagnetic control valve 4 which is always activated to return to a position that communicates the power chamber 46 with the outside air via the air cleaner 27 and the pipe 26 is inserted into the pipe 44 between the air cleaner 27 and the pipe 26;
an actuation circuit 4 for a solenoid 4a that switches the solenoid control valve 4 to communicate the power chamber 46 with a vacuum pressure source;
The change-over switch 1, into which the normally open contact 6 of the keep relay 2 is inserted, selectively conducts the excitation coil 46 and the demagnetizing coil 47 of the keep relay, is connected to the aforementioned switch 15, which closes when the clutch is disengaged, and the starter switch 29. The power supply 65 is connected to the power supply 65 sequentially.

Between this degaussing coil 47 and the power supply 65, a circuit 49 in which a normally open contact 6 of a relay 48 is inserted is connected in parallel with a switching operation circuit 50 of the degaussing coil and the excitation coil 46, and the contact 6 is connected to a vacuum sensor. Closed by the signal issued by 67. That is, when the switch 68 of the vacuum sensor is closed, the excitation coil 51 of the relay 48 conducts and closes the contact 6. 1 and 52 are alarm devices such as a pilot lamp or a buzzer connected to the contact 6 in parallel with the degaussing coil 47. The alarm 52 is mounted within the cab 16 to notify the operator that the power take-off is disconnected.

The switch 7 is inserted into the circuit between the changeover switch 1 and the excitation coil 46, and the switch (microswitch) 7 has its switch changeover pin 7a as shown in FIG.
is attached to the manual transmission 12 so that it fits into the annular groove 53a provided in the shift fork operating shaft 56 in the neutral position of the manual transmission 12, thereby closing the contact point. Therefore, when the shift fork 54 is moved to the shift position as shown in FIG. 4 by its operating shaft 56, the switch 7 is opened by the switch changeover pin 7a.

FIG. 1 shows a state in which the garbage collection vehicle is stopped, the switching lever 42 is in the off position, and the sliding gear of the power take-off device 5 is disengaged from the input gear. From this state, the starter switch 29 is closed in advance. In addition, when the transmission 12 is placed in the neutral position shown in FIG. 3 and the switch 7 is closed, the clutch pedal 14 is depressed to close the switch 15 and the changeover switch 1 is closed to the on side, the excitation coil 46 of the keep relay 2 becomes conductive. Since the normally open contact 6 is closed, the operating circuit 45 of the solenoid 4a becomes conductive to switch the control valve 4 and connect the power chamber 46 to the vacuum pressure supply source (t8.19). Therefore, the power chamber 46 is switched. The lever 42 is rotated to the contact position shown by the chain line in the figure, the sliding gear is engaged with the input gear, and the hydraulic pump 1 is turned.
1, then return the changeover switch 1 to the neutral position shown.

In this case, the contact 6 of the keep relay 2 is connected to each switch 1, 7.
．． 15 is opened, the contacts are mechanically held in the closed state, so it is possible to drive the garbage loading device 8 when the vehicle is stopped, and it is also possible to drive the garbage loading device 8 while the garbage collection vehicle is traveling at low speed. Moreover, when the clutch is disengaged and the switch 15 is closed, the selector switch 1 is also driven.
By closing the degaussing coil 47 to the open side and opening the contact 6, the control valve 4 returns to the normal position and the power chamber 46 is communicated with the outside air, so the switching lever 42 is moved by the spring force. When the vehicle is turned to the ``c'' cut-off position, the power output can be cut off regardless of whether the vehicle is stopped or the vehicle is moving.

In addition, when the hydraulic pump 11 is operated with almost no load by setting the directional control valves that control each actuator of the dust loading device 8 to the neutral position, or while driving while operating the dust loading device, the exhaust When the brake operating pressure of the vacuum pressure supply source that operates the brake device 17 is insufficient and the switch 68 of the vacuum sensor 67 is closed, the excitation coil 51 of the relay 48 is closed.
conducts and closes its contact 6, so the actuating circuit 49 of the degaussing coil 47 conducts and opens the contact 6 of the keep relay 2, cutting off the power extraction by the power extraction device 5 as described above. That is, since the operation of the exhaust brake has priority over the power extraction by the power extraction device, the vacuum pressure supply source (18,
19) There is no risk that the power take-off device will become partially disconnected, which caused a sudden decrease in the vehicle braking ability due to insufficient brake operating pressure and the exhaust brake not operating.

On the other hand, when driving with the power take-off device 5 in the OFF state, the shift fork operating shaft 56 opens the switch 7, so even if you accidentally close the changeover switch 1 to the on side, the clutch pedal 14 cannot be depressed. When shifting gears, there was no risk that the excitation coil 46 would become conductive and the power take-off device 5 would be switched to the close side, and therefore the vehicle speed would suddenly drop suddenly, resulting in a rear-end collision with the following vehicle, and the gears of the power take-off device would be damaged. There is no fear of it happening.

The case of a car with a manual transmission has been explained above, but
In the case of a vehicle with an automatic transmission, as shown in FIGS. 5 and 6, there is a micro switch 7 that closes only when an operating lever 55 provided in the cab is in the neutral position N to set the control conditions of the automatic transmission. ' to the support base 56 of the operating lever.
switch bracket (fixed to the switch bracket) 56'a.

Further, in the above-described embodiment, the deceleration brake is operated by a vacuum pressure supply source, but the present invention also includes a case where a traveling air brake or the like is operated by a compressed air pressure supply source.

According to the present invention, it is possible to operate a working device while driving at low speed by using a relatively small capacity fluid pressure supply source on a specially equipped vehicle equipped with a working device that operates when stopped. Moreover, since priority is given to securing the vehicle braking ability in extracting the engine power for driving the working equipment, the vehicle can be braked in the same manner as before. Furthermore, even if the changeover switch of the power take-off device is erroneously operated while the vehicle is running, there is no risk of the vehicle speed suddenly decreasing, and there is no risk of damage to the gears of the power take-off device.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of one embodiment of the present invention, Fig. 2 is a vertical cross-sectional side view of a garbage collection vehicle equipped with this circuit, and Figs. 3 and 4 are respectively an open view of the manual transmission switch mounting part. 08... Working device (dust loading device), 9... packing box, 1
1...Hydraulic pump, 12...Manual transmission, 16...
・Power take-off shaft, 14...Clutch pedal, 15...
Clutch switch, 16... Cab, 17... Exhaust brake device, (18, 19)... Fluid pressure supply source (
vacuum pressure supply source), 20...engine exhaust pipe, 26.
...Single-acting power chamber, 25...Solenoid control valve, 6
7... Vacuum sensor, 42... Switching lever, 4
6...Single-acting power chamber, 46...Exciting coil, 47...Demagnetizing coil

Claims (2)

[Claims] (1) A work device, a fluid pressure supply source for driving the travel brake driven by the travel engine, and a switching device that utilizes the supply pressure to disconnect or connect the work device drive power from the travel engine. In a specially equipped vehicle that is fully equipped with a device that issues a signal when the running brake operating pressure of the fluid pressure supply source is insufficient, a keep relay (1) in which the excitation coil and the demagnetization coil are selectively made conductive by a changeover switch (1) is provided. 2), when the excitation coil is conductive and its normally open contact (6) is closed, the control valve (4) of the switching device
is connected to the connection side of the power take-off device (5), and a normally open contact (6) that is closed upon receiving the signal is connected between the degaussing coil and the power source in parallel with the changeover switch. A power take-off control device for a specially equipped vehicle, which is characterized by being connected. (2) A working device, a fluid pressure supply source for driving the traveling brake driven by the traveling engine, and a switching device that utilizes the supply pressure to disconnect and control the extraction of power for driving the working device from the traveling engine. and a device that issues a signal when the running brake operating pressure of the fluid pressure supply source is insufficient, in a specially equipped vehicle equipped with a keep relay (1) in which the excitation coil and the demagnetization coil are selectively brought into conduction by a changeover switch (1). 2) of the control valve (4) of the switching device when its normally open contact (6) closes due to conduction of the excitation coil.
is provided so as to be switched to the connection side of the power take-off device (5), and a normally open contact (6) which is closed upon receiving the signal between the degaussing coil and the power source is connected in parallel with the changeover switch. , and characterized in that a switch (7) that closes only when the traveling transmission is in a neutral position is provided, and the switch (7) is inserted in the operating circuit of the excitation coil in series with the changeover switch (1). Power extraction control device for specially equipped vehicles.