JPH0421747Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a parking brake device for a vehicle.

(Prior Art) Among large special vehicles, there are known vehicles, such as all-terrain vehicles, which have a driver's seat not only on the bogie side but also in the cockpit on the upper side.
As a parking brake device for such a vehicle, the brake can be activated and released at will from either driver's seat, which was proposed by the applicant in 1983.
-177809 and 57-195216.

In FIG. 3, a solenoid valve 4 is interposed in the middle of an air pressure passage 3 connecting an air pressure tank 1 and a spring brake chamber 2. As shown in FIG.

The solenoid valve 4 has a position 4A that blocks the air pressure passage 3 and a position 4B that opens the air pressure passage 3 to the atmosphere, and is designed to maintain the position 4A when energized.

Reference numeral 5 denotes a drive circuit for the electromagnetic valve 4, and in the middle of the drive circuit are installed changeover switches 7 and 8, which are respectively disposed on the driver's seats 6A and 6B on the truck side and the upper part side.

9 is a compressor that supplies air pressure to the air pressure tank 1; 10 is a brake operation indicator lamp 11 when the air pressure in the downstream passage 3 of the solenoid valve 4 is below a set value;
and 12 circuits 13 are shown.

In the illustrated brake released state, when either one of the changeover switches 7 and 8 is operated, the solenoid valve 4 is switched to release the air pressure in the spring brake chamber 2 to the atmosphere at position 4B. In other words, the parking brake is activated.

To release the parking brake, it is only necessary to switch either one of the changeover switches 7 and 8 again. In this case, the solenoid valve 4 switches to position 4A and air pressure is supplied to the spring brake chamber 2, so that the spring brake is activated. It will be canceled.

(Problem that the invention aims to solve) By the way, in a vehicle equipped with two driver seats, it is difficult for the driver to transfer from the driver's seat on the trolley side to the driver's seat on the upper side, or vice versa. This is often done, but there was a concern that the driver would forget to apply the parking brake when exiting the vehicle from one driver's seat.

(Means for solving the problem) In order to solve this problem, this invention
In a vehicle equipped with two driver seats, a driver's seat on the bogie side and a driver's seat on the upper side, and a spring brake device that operates based on operating pressure from an air pressure tank, the pressure from the air pressure tank is applied to the bogie side. A passage supplied through a manual switching valve installed in the driver's seat;
A pressure circuit is formed which connects the pressure to the spring brake device by merging the passage through a directional control valve with a passage that supplies the pressure through a first electromagnetic valve that is switched in conjunction with an engine key switch on the upper side driver's seat. ,
The first solenoid valve configures the spring brake device to be in the operating position when the engine key switch is on and in the inoperative position when the engine key switch is off, while a second solenoid valve is arranged between the directional control valve and the spring brake device. A solenoid valve is installed, and this second solenoid valve sets the spring brake device to the operating position when the engine key switch on the driver's seat on the bogie side is on, and to the operating position when the engine key switch on the driver's seat on the upper truck side is on. The key switch is configured to be switched to an activated position or a released position depending on the position of a changeover switch provided in series with the key switch.

In addition, an alarm buzzer is installed in each of the driver's seat on the bogie side and the driver's seat on the upper side, and a high pressure switch that is turned on when air pressure is supplied is provided between the manual switching valve and the directional switching valve. The alarm buzzer for the seat is activated when the high pressure switch is on and the engine key switch on the driver's seat on the bogie side is off, and the alarm buzzer on the upper driver's seat is activated when the engine key switch on the driver's seat on the upper side is activated. Each alarm circuit is provided so that an alarm is activated when the switch is off and the changeover switch is on the brake release side.

(Function) According to the above configuration, if the engine key switch is in the ON state from either the bogie side driver's seat or the bogie side driver's seat, the bogie side driver's seat can operate the manual switching valve to turn on the bogie side driver's seat. In the side driver's seat, the parking brake can be applied by operating the spring brake device by operating the changeover switch.

On the other hand, if you neglect to operate the parking brake and turn off the engine key switch, the high-pressure switch for the driver's seat on the bogie side is turned on at this time, so a warning buzzer will go off to alert the driver that the parking brake is not activated. to warn. Further, for the upper driver's seat, when the changeover switch is in the parking brake release position and the engine key switch is turned off, the alarm buzzer is also activated. This prevents the driver from leaving the driver's seat without applying the parking brake.

(Example) In FIG. 1, 20 is an air pressure passage connecting the air pressure tank 1 and the spring brake chamber 2, and the air pressure passage 20 is branched into 20A and 20B in the middle, and a manual switching valve 21 is attached to one of them. However, a first electromagnetic valve 22 is interposed on the other side, and these are formed to join 20C downstream and reach the spring brake chamber 2.

The manual switching valve 21 is disposed in the driver's seat 6A on the truck side, and has a position where the upstream side and the downstream side are communicated, and a position where the upstream side is shut off and the downstream side is opened to the atmosphere. Hold the switching position.

Like the manual switching valve 21, the first solenoid valve 22 has a communication position and an atmosphere release position, and when the engine key switch 27 provided on the driver's seat 6B on the upper side is turned on, it is placed in the communication position, and when it is turned off, it is placed in the atmosphere release position. Switch to position.

At the confluence of the air pressure passages 20A and 20B,
A directional switching valve 23 is provided which switches depending on the internal pressure of each passage. This directional control valve 23 has passages 20A and 2
It is a pressure-responsive valve that communicates the high pressure side of 0B with the downstream merging passage 20C and shuts off the other side. Further, a second solenoid valve 24 is located downstream of this directional control valve 23.
is interposed.

The second solenoid valve 24 has a position that communicates the upstream side and the downstream side, and a position that blocks the upstream side and opens the downstream side to the atmosphere, and has an excitation coil 24A for switching to the communication side position and a side that opens to the atmosphere. excitation coil 24 for switching to the position of
B, and once the position is switched, the position is maintained even if the excitation coils 24A, 24B are de-energized (so-called lock type).

25 is a drive circuit for the second electromagnetic valve 24, and this drive circuit 25 is connected to a first drive circuit 25A that supplies battery current via an engine key switch 26 disposed on the driver's seat 6A on the bogie side, and a first drive circuit 25A on the upper part side. driver's seat 6
A second drive circuit 25B supplies battery current through a changeover switch 29 of B.

When the engine key switch 26 is turned on, the first drive circuit 25A energizes the excitation coil 24A on the communication side of the second electromagnetic valve 24 via a high pressure switch 28, which will be described later.

On the other hand, when the engine key switch 27 is on, the second drive circuit 25B
9, the excitation coils 24A and 24B on the communication side and cutoff side of the second electromagnetic valve 24 are selectively energized.

The high pressure switch 28 causes the air pressure between the manual switching valve 21 and the directional switching valve 23 to exceed the set value, that is, the air pressure from the air pressure tank 1
It turns on when supplied via the .

By the way, the driver's seats 6A and 6B on the trolley side and the upper side
Parking brake warning buzzer 40 and 41
are arranged respectively.

When the high pressure switch 28 is on, that is, when the parking brake is released and the engine key switch 26 is turned off, the alarm buzzer 40 on the truck side is activated by the relay 4.
It operates by being energized via 2.

In addition, when the engine key switch 27 is turned off while the changeover switch 29 is on the drive side (parking brake release side), the alarm buzzer 41 on the upper side is energized via the relay 43 and activated like the alarm buzzer 40 on the truck side. do.

Here, when the engine key switches 26 and 27 are turned on, the relays 42 and 43 are energized and switched to the second electromagnetic valve 24 side, and when turned off, the relays 42 and 43 are demagnetized and switched to the alarm buzzer 40 and 41 side. In addition, the relay 43 on the upper side has a switch 44 that is interlocked with the relay 43.
is provided, and even when the changeover switch 29 is on the parking brake activation side (parking side), when the engine key switch 27 is turned off, the switch 44 is opened and the second
The energization to the atmosphere open side excitation coil 24B of the solenoid valve 24 is cut off to prevent over-discharge of the battery.

30 is a low pressure switch that is turned on when the air pressure between the spring brake chamber 1 and the second solenoid valve 24 is below a set value; 12 is the driver's seat 6B on the upper side;
11 is a parking brake operation display lamp provided on the driver's seat 6A on the bogie side. These lamps 11 and 12 indicate that when the engine key switches 26 and 27 are on, the low pressure switch 30 is on ( In other words, it lights up when the brakes are applied. 31 indicates a diode.

To release the parking brake from the driver's seat 6A on the truck side, turn on the engine key switch 26 and switch the manual switching valve 21 to the communication position. Air pressure from the air pressure tank 1 activates the manual switching valve 21. to the second electromagnetic valve 24 via the directional switching valve 23 (blocking the air pressure passage 20 on the low pressure first electromagnetic valve 22 side and communicating the passage 20 on the high pressure manual switching valve 21 side to the downstream side). reach

The second electromagnetic valve 24 is energized to the excitation coil 24A on the communication side via the high pressure switch 28 (turned on by switching the manual switching valve 21), and in the communication position, the air pressure from the directional switching valve 23 is transferred to the spring brake channel. The parking brake is then released.

In addition, in order to operate the parking brake, it is sufficient to switch the manual switching valve 21 to the cutoff position. It is opened to the atmosphere by the manual switching valve 21, thereby operating the parking brake.

Although the high pressure switch 28 is turned off when the air pressure is released at the manual switching valve 21, the second electromagnetic valve 24 is a lock type and maintains the communicating position.

When the air pressure in the spring brake chamber 2 falls below the set value, the low pressure switch 30 is turned on and the brake operation indicator lamp 11 lights up. After confirming this, the driver turns the engine key switch 26. All you have to do is cut it.

On the other hand, when releasing the parking brake from the driver's seat 6B on the upper side, when the engine key switch 27 is turned on, the first solenoid valve 22 is switched to the communication side, and the air pressure in the air pressure tank 1 is accordingly changed. is (when the manual switching valve 21 is on the cutoff side) the first solenoid valve 2
2. A second electromagnetic valve 24 via a directional switching valve 23 (connecting the high-pressure side upstream passage 20B to the downstream passage 20C)
reach.

In this state, when the changeover switch 29 is turned to the travel side (brake release side), the second solenoid valve 24 is in the communication position and supplies air pressure from the direction changeover valve 23 to the spring brake chamber 2. The parking brake is released.

Furthermore, in order to operate the parking brake, it is sufficient to switch the changeover switch 29 to the parking side (brake activation side) while the engine key switch 27 is on, and at this time, the second solenoid valve 24 is set to the shutoff side. Then, the air pressure in the spring brake chamber 2 is released to the atmosphere, and the spring brake is activated.

Then, when the low pressure switch 30 is turned on in the same manner as described above, the brake operation indicator lamp 12 lights up.

By the way, if the driver is sitting in the driver's seat 6A on the trolley side, for example,
When transferring to the driver's seat 6B on the upper side from
Since the circuit is switched from the solenoid valve 24 side to the alarm buzzer 40 side, the alarm buzzer 40 is activated to warn of forgetting to apply the parking brake.

Incidentally, even if the driver forgets to apply the parking brake in the driver's seat 6B on the upper side, the relay 43 is similarly switched and the alarm buzzer 41 is activated.

FIG. 2 shows another embodiment of the alarm circuit on the upper side, in which the alarm buzzer 41 is connected to the changeover switch 2.
It is connected to the off side of the engine key switch 27 via a switch 50 linked to the switch 9, and turns off the engine key switch 27 when the changeover switch 29 is on the parking brake release side (driving side) (switch 50 is closed). When the parking brake is turned on, it activates to alert you if you forget to apply the parking brake.

(Effect of the invention) As described above, according to this invention, the pressure passage is opened by the manual switching valve provided on the driver's seat on the bogie side and the first solenoid valve linked to the engine key switch on the driver's seat on the upper side. The pressure passages are connected to the spring brake device by merging them with the pressure passage through a directional control valve, and in the middle of the merging passage, there is an engine key switch on the driver's seat on the bogie side or a switching switch in series with the engine key switch on the driver's seat on the upper side. Since the configuration is equipped with a second solenoid valve that opens and closes according to By operating the valve, the parking brake can be applied by operating the spring brake device in the driver's seat on the upper side by operating the changeover switch.

In addition, this invention utilizes the driving pressure circuit or electric circuit of the spring brake device,
If you neglect to operate the parking brake and turn off the engine key switch, the high-pressure switch installed between the manual switching valve and the directional switching valve for the driver's seat on the side of the bogie will indicate that the parking brake is not activated. On the other hand, when the changeover switch for the upper driver's seat is in the parking brake release position and the engine key switch is turned off, the alarm buzzer is also activated. This has the effect of preventing forgetting to apply the parking brake when transferring from one driver's seat to the other driver's seat.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of this invention.
FIG. 2 is a circuit diagram of a main part of another embodiment, and FIG. 3 is a schematic configuration diagram showing a conventional example. DESCRIPTION OF SYMBOLS 1... Air pressure tank, 2... Spring brake chamber, 6A, 6B... Driver's seat, 20... Air pressure passage, 21... Manual switching valve, 22... First solenoid valve, 23... Direction Switching valve, 24...Second solenoid valve, 26, 27...Engine key switch, 2
8... High pressure switch, 29... Changeover switch, 4
0,41...Alarm buzzer, 42,43...Relay.

Claims (1)

[Scope of utility model registration request] In a vehicle equipped with two driver seats, a driver's seat on the bogie side and a driver's seat on the upper side, and a spring brake device that operates based on operating pressure from an air pressure tank, the pressure from the air pressure tank is applied to the bogie side. A passage supplied through a manual switching valve installed in the driver's seat;
A pressure circuit is formed which connects the pressure to the spring brake device by merging the passage through a directional control valve with a passage that supplies the pressure through a first electromagnetic valve that is switched in conjunction with an engine key switch on the upper side driver's seat. ,
The first solenoid valve configures the spring brake device to be in the operating position when the engine key switch is on and in the inoperative position when the engine key switch is off, while a second solenoid valve is arranged between the directional control valve and the spring brake device. A solenoid valve is installed, and this second solenoid valve sets the spring brake device to the operating position when the engine key switch on the driver's seat on the bogie side is on, and to the operating position when the engine key switch on the driver's seat on the upper truck side is on. The switch is arranged in series with the key switch and is configured to be switched to an activated position or a released position depending on the position of the switch, and an alarm buzzer is provided on each of the driver's seat on the bogie side and the driver's seat on the upper side. A high-pressure switch that is turned on when air pressure is supplied is provided between the valve and the directional control valve, and the alarm buzzer on the driver's seat on the bogie side issues an alarm when the high-pressure switch is on and the engine key switch on the driver's seat on the bogie side is off. In order to operate, the alarm buzzer on the upper side driver's seat is provided with an alarm circuit so that the alarm is activated when the engine key switch on the upper side driver's seat is off and the changeover switch is on the brake release side. A parking brake device for a vehicle characterized by: