JPH0717589Y2 - Brake system for combined vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a braking device for an articulated vehicle, and more specifically,
The lighting structure of a stop lamp.

(Prior Art) As is well known, in a braking system for a combined vehicle including a tractor and a trailer, a full air brake system may be used, as an example is shown in FIG.

That is, the full air brake system shown in FIG. 3 includes the pressure supply unit A and the pressure setting unit B.

The pressure supply unit A described above includes an air compressor A1 driven by an engine, an air tank A2, and a pressure governor A3 that maintains a constant pressure between these supply members. The air tank A2 described above is used in a pressure setting unit B described later. Air of constant pressure is supplied to the pressure setting members on the tractor side and the trailer side.

On the other hand, the pressure setting unit B is provided on each of the tractor side and the trailer side. The tractor side is provided with a brake valve B1 that is linked to a foot brake operated by a driver, and the trailer side is provided with a trailer brake. Each is composed of an operating hand control valve B2. This trailer brake actuation hand control valve B2 is operated by operating the operation lever provided on the instrument panel installed in the cab,
The opening is set.

The tractor side of the pressure setting unit B described above is divided into a front axle side and a rear axle side, and the front axle side is brake chamber B11 on the front axle side from the brake valve B1a through the quick release valve B10. The rear axle side uses the brake valve B1b as a starting point to detect the load that changes depending on the loading status of the trailer side luggage or the presence or absence of the trailer, and to set the braking force on the rear axle side. It is connected to the brake chamber B14 through a load sensing valve B12 and a relay valve B13 for improving responsiveness.

On the other hand, the pressure setting unit on the trailer side sets the braking force on the trailer side according to the emergency brake system that brakes when the trailer separates during traveling and the depression amount of the brake valve on the tractor side. It is divided into a service brake system, and the emergency brake system is formed by piping from the air tank A2 to the brake mechanism on the trailer side via the air supply path switching cock B15 equipped in the connection part. Also, the service brake system is connected to the output side of the above-mentioned trailer brake actuating hand control valve B2, and the above-mentioned brake valve B1a on the front axle side on the tractor side is provided.
Double check valve B16 that also allows the passage of air from the output side of the
It is formed by piping connection to the braking mechanism on the trailer side via a relay valve B17 located on the output side of.

In a full air brake system for such a braking device, a stop lamp is provided in the tractor-side and trailer-side pressure setting pipelines to warn a following vehicle that the braking operation has been performed by each pressure setting unit. A lighting mechanism is provided.

That is, this lighting mechanism is composed of an air switch that is operated by the pressure in the pipeline, and via the brake valve B1b, the load sensing valve B12, and the relay valve B13 on the rear axle side in the pressure setting section on the tractor side. An air switch C1 on the tractor side is provided in the line to the brake chamber, a line between the double check valve B16 and the relay valve B17, and a line between the hand control valve for trailer brake actuation B2 and the double check valve B16. Air switches C2 and C3 on the trailer side in the pipeline
Are arranged respectively.

Among the air switches described above, the tractor side air switch C1 is connected to the relay valve B17 located in the service brake system on the trailer side, and when the brake valve B1 on the tractor side is depressed, the trailer side The relay valve B17 is set so that air can be supplied to the braking mechanism.

Each of these air switches is incorporated in the circuit shown in FIG. 4, and enables the lamp to be turned on when the foot brake is depressed on the tractor side or when the trailer brake operating hand control valve B2 is operated. .

That is, the circuit described above has power relays D1 and D2 that are connected in parallel to the power source, and this power relay serves as a driving member for the tractor stop lamp E1 and the trailer stop lamp E2 that are connected in series to them. It works.

Further, of the air switches shown in FIG. 3, the air switch C3 located between the trailer brake actuation hand control valve B2 and the double check valve B16 is
As shown in FIG. 4, the trailer brake operating lamp E3 provided on the driver's cab side is connected in series to display the operation position of the trailer brake.

In the braking device having the above structure, the braking pressure is set for the front and rear axles on the tractor side and the braking mechanism on the trailer side according to the braking operation mode selected by the driver. .

That is, at the time of braking by the foot brake, air having a pressure corresponding to the operation amount of the brake valves B1a and B1b is supplied to the front axle side and the rear axle side, but on the front axle side, the brake chamber is supplied via the quick release valve B10. Is being supplied to the brake valve B1a.
Air is supplied to a relay valve B17 communicating with a braking mechanism on the trailer side via a double check valve B16 located in a pipe branching from the output side of the.

On the rear axle side, air is supplied from the output side of the brake valve B1b to the brake chamber via the load sensing valve B12 and the relay valve B13.

On the other hand, the relay valve B17 located on the air input side of the trailer braking mechanism has its operating position set by the air switch C1 located in the pipeline toward the brake chamber of the rear axle on the tractor side, and is a double check valve. Air from the B16 is supplied to the brake mechanism on the trailer side with air at a pressure that depends on the operating amount of the foot brake.

At this time, the power relay shown in FIG. 4 is excited via the air switches C1 and C2, and the stop lamps on the tractor side and the trailer side are turned on.

On the other hand, when braking only on the trailer side,
Hand control valve B2 for trailer brake actuation
By operating the operation lever of (2), air having a pressure corresponding to the operation amount of the hand control valve B2 for operating the trailer brake is supplied to the braking mechanism of the trailer via the double check valve B16 and the relay valve B17.

As described above, at the time of setting the braking force on the tractor side and the trailer side, the stop lamp power relays on the tractor side and the trailer side are interlocked with the transition of the air switch located in each pipeline to the ON state. The stop lamps E1 and E2 are turned on by exciting D1 and D2.

(Problems to be Solved by the Invention) In the braking device described above, if the hand control valve for operating the trailer brake is operated by mistake, the following problem may occur.

That is, if the trailer brake actuating hand control valve B2 is operated during operation with only the tractor without the trailer connected, as is apparent from FIG. 3, the double check valve B16 to the relay valve B17
The air switch C2 located in the pipeline leading to is turned on.

Therefore, as shown in FIG. 4, when the air switch C2 is turned on, a closed circuit for lighting the stop lamp E1 on the tractor side is formed.

However, when the trailer brake is activated, the third
As is clear from the figure, since the air supply paths to the brake chambers B11 and B14 on the front and rear axles on the tractor side are not formed, the tractor itself does not have the deceleration effect due to the setting of the braking pressure, and the tractor does not reach the following vehicle. Therefore, there is a risk that the following vehicle may be informed of a driving operation that does not suit the actual traveling environment.

That is, the trailer brake is operated for the purpose of braking only the trailer in order to prevent the tractor from being pushed by the trailer, for example, when traveling downhill. The result is that the braking effect to the side cannot be obtained, and as a result, for example, even if the road is empty, a braking warning will be issued and the following vehicle will have to apply a sudden brake, which poses a danger. Become.

Further, in the above braking device, when the trailer brake actuating hand control valve B2 is operated with the trailer connected to the tractor, the air switch
The trailer operation indicator lamp E3 is turned on by the operation of C3, and the trailer operation indicator lamp E3 is also turned on when the trailer brake actuating hand control valve B2 is operated without the trailer being connected to the tractor. If the trailer operation lamp E3 lights up in this situation, the driver may mistakenly think that the trailer brake is operating.

Therefore, in view of the problems in the above-described conventional braking device, particularly in the braking device for a combined vehicle, an object of the present invention is to accurately determine the braking state of the trailer to the driver without giving a useless braking warning to the following vehicle. To obtain a braking device that can be recognized.

(Means for Solving the Problem) In order to achieve this object, the present invention provides a braking device applied to a combination vehicle including a tractor and a trailer,
An air supply unit including an air tank, and a brake valve that is connected to the air supply unit and outputs an air pressure according to the operation amount of the foot brake to control the air supply from the air supply unit to the brake chamber on the tractor side, It is connected to the air supply unit and outputs the air pressure that controls the operation of the brake mechanism on the trailer side.It is linked to the trailer brake actuation hand control valve and the air pressure supplied from the brake valve or the trailer brake actuation hand control valve. Relay valve that controls the air supply from the air supply unit to the braking mechanism on the trailer side, and the air supply between the double check valve and the relay valve that allows the air supply from the brake valve and the hand control valve for operating the trailer brake. Located on the road, brake valve or trailer Trailer side air switch that operates by the air pressure output from the brake hand control valve to the relay valve, and the trailer side that works in conjunction with the air supply path switching cock that sets the air supply to the relay valve when the trailer is connected Connection confirmation switch that is activated when air is supplied to the trailer system, trailer system air switch and trailer stop lamp that are connected to light when the connection confirmation switch is activated, and the trailer system The driver's cab, which is wired so that it lights when the air switch and the connection confirmation switch are activated, and the tractor stop lamp and trailer stop lamp that are connected so that they light up, and the trailer system air switch and the connection confirmation switch operate when activated. Trailer installed in ; And a brake actuation indicator lamp.

According to the present invention, when the trailer system air switch and the connection confirmation switch are operated, in other words, when the trailer brake operating hand control valve is operated while the trailer is connected to the tractor, The stop lamp for the trailer and the stop lamp for the trailer are both lit, and the connection confirmation switch does not operate when the trailer is not connected to the tractor, so the trailer brake operation hand control valve is operated and the trailer system air switch is operated. The tractor stop lamp does not light up even when the status changes. Also, since the trailer brake operation indicator lamp is connected so that it lights only when the trailer air switch and the connection confirmation switch are activated, the trailer operation indicator lamp is illuminated only when the trailer braking mechanism actually operates. To do. Further, since the trailer system air switch and the connection confirmation switch are shared for both the stop lamp lighting control and the trailer operation display lamp lighting control, the configuration is simplified.

(Embodiment) Hereinafter, the details of the embodiment of the present invention will be described with reference to FIG. 1 and FIG.

FIG. 1 is a system diagram corresponding to FIG. 3 showing the entire configuration of the braking device according to the embodiment of the present invention, and the same components as those shown in FIG. 3 are designated by the same reference numerals.

Rear axle load sensing valve B12 on the tractor side
A first air switch C10 having the same structure as the air switch C1 shown in FIG.

The first air switch C10 described above is actuated by the pressure of the air flowing in the conduit, like the one used in the system shown in FIG. 3, and is turned on when a predetermined pressure or more is reached. To set.

In addition, in the pipeline from the double check valve B16 to the relay valve B17, the air supply switch for the trailer system that is turned on by detecting the air supply output from the control valve B2 and flowing the air at a predetermined pressure or higher. The second air switch C11 is arranged.

In addition to the above-described air switch, the air supply passage switching cock B15 in FIG. 1 is provided with a connection confirmation switch C12 that operates depending on the switching position, in other words, the switching position. C12
Is turned on when the above-mentioned cock B15 is set to a position where the trailer is connected and air can be supplied to the trailer. Incidentally, in FIG. 1, the reference numeral C12 of the connection confirmation switch is shown attached to the air supply passage switching cock B15 for convenience.

The air switches C10, C11 and the connection confirmation switch C12 described above are incorporated in the circuit shown in FIG. 2 so as to set the stop lamp to be turned on.

That is, in FIG. 2, a stop lamp E1 for a tractor having a wiring structure similar to that of the conventional one shown in FIG.
Power Relay D1 and Stop Lamp for Trailer
The first air switch C10 is connected in series to the power relay D2 of E2.

Therefore, when the foot brake operation is performed on the tractor side, the front axle side (B1a) of the brake valve B1 is
Lighting control of the tractor stop lamp E1 and the trailer stop lamp E2 is performed via the first air switch C10 depending on how the air flows in the air supply passage on the rear axle side (B1b).

On the other hand, the second air switch C11 shown in FIG.
As shown, it is connected in parallel with the first air switch C10.

That is, the second air switch C11 is connected to the first air switch C10 connected in parallel with the diode d1.
And the trailer operation indicator lamp E3 connected in series to the power source and the diode d2 in series, so that the lighting of each lamp can be controlled independently of the air switch C10. Is done.

Further, the connection confirmation switch C12 described above is connected in series to the ground side of the second air switch C11 described above. Therefore, the second air switch C11 and the connection confirmation switch C12 also constitute a lighting control circuit of the trailer operation indicator lamp E3, and by the diode d2,
It is functionally separated from the stop lamp lighting control circuit so that it can be operated when the air supply path to the brake mechanism of the trailer is actually connected.

Therefore, when the trailer brake actuating hand control valve B2 is operated while the brake valve B1 linked to the foot brake on the tractor side is not operated, the output pressure from the relay valve B17 in FIG. In other words, even when the air having the pressure set by the trailer brake actuating hand control valve B2 is supplied into the pipeline leading to the trailer braking mechanism, in other words, the second air is supplied. Even if the switch C11 is turned on, unless the connection confirmation switch C12 in FIG. 2 is turned on, the stop lamps E1 and E2 and the trailer operation display lamp E3 do not have a closed circuit for lighting. The lamps E1, E2, E3 remain unlit.

Therefore, even if the trailer brake actuating hand control valve B2 is operated when the foot brake on the tractor side is not operated, the stop on the tractor side and the trailer side is stopped when the trailer is not connected. The lamp will not be turned on.

In other words, when only the trailer brake actuating hand control valve B2 is operated without the trailer being connected, the air supply path switching cock B15 that should be operated during connection is not set to the connected position. ,
The air supply path to the trailer's braking mechanism is not set, the connection confirmation switch C12 is inactive,
The so-called off state is maintained, and as a result, a state in which a closed circuit for lighting to the tractor stop lamp E1 (see FIG. 2) and the trailer stop lamp E2 (see FIG. 2) is not formed is obtained. The lamps E1 and E2 are not turned on.

In this way, even if the trailer brake actuation hand control valve B2 is operated, the connection confirmation switch
If C12 does not turn on, in Fig. 2,
Even when the second air switch C11 is in the ON state, the trailer operation indicating lamp E3 is maintained in the non-illuminated state.

As described above, according to the present invention, when the trailer brake operating hand control valve is erroneously operated while the trailer is not connected to the tractor, the tractor stop lamp is not unnecessarily lit and the tractor is braked. It is possible to prevent a useless braking warning to the following vehicle in a situation where there is no effect. Further, since the trailer operation indicator lamp lights up only when the braking mechanism on the trailer side actually operates, it is possible to surely let the driver recognize the operating state of the trailer brake. Furthermore, since the trailer system air switch and the connection confirmation switch are shared for the lighting control of the stop lights for the tractor and trailer and the lighting control of the trailer brake operation indication lamp, the lighting control circuit for the trailer brake operation indication lamp is shared. This simplifies the configuration and reduces the cost of this circuit, and also allows the driver to recognize that the trailer stop lamp does not light due to a failure of the trailer system air switch and the connection confirmation switch. it can.

[Brief description of drawings]

FIG. 1 is a system diagram showing an overall configuration of a braking device according to an embodiment of the present invention, FIG. 2 is a circuit diagram for explaining an electric system in the system shown in FIG. 1, and FIG. 3 is a conventional braking device. FIG. 4 is a system diagram corresponding to FIG. 1 showing the overall configuration, and FIG. 4 is a circuit diagram corresponding to FIG. 2 for explaining an electric system in the system shown in FIG. A ... pressure supply part, B ... pressure setting part, B1 ... brake valve, B1a ... front axle side brake valve, B1b ... rear axle side brake valve, B2 ... trailer actuation hand control valve, B11, B14 …… Brake chamber, B13, B17 …… Relay valve, C10 …… First air switch, C11 …… Second air switch, C12 …… Connection confirmation switch, D1, D2 …… Power relay, E1 ...... Tractor stop lamp, E2 …… Trailer stop lamp,
E3 …… Trailer operation indicator lamp, d1, d2 …… Lighting unidirectional element for dividing the drive circuit.

Claims (1)

[Scope of utility model registration request] 1. A braking device applied to a combined vehicle comprising a tractor and a trailer, wherein an air supply unit including an air tank and an air pressure connected to the air supply unit and outputting an air pressure according to an operation amount of a foot brake. The brake valve that controls the air supply from the air supply unit to the brake chamber on the tractor side, and the trailer brake operation that outputs the air pressure that is connected to the air supply unit and controls the operation of the brake mechanism on the trailer side Hand control valve, and a relay valve that controls air supply from the air supply unit to the braking mechanism on the trailer side in conjunction with air pressure supplied from the brake valve or the hand control valve for operating the trailer brake, Is it the above brake valve and the above hand control valve for operating the trailer brake? A trailer that is arranged in the air supply path between the double check valve that allows the air supply of the above and the relay valve, and that is operated by the air pressure output from the brake valve or the hand control valve for operating the trailer brake to the relay valve. A system air switch, a connection confirmation switch that is activated when the air supply state to the trailer side is interlocked with an air supply path switching cock that sets the air supply to the relay valve when the trailer is connected, and A tractor stop lamp and a trailer stop lamp that are connected to light when the trailer system air switch and the connection confirmation switch are activated, and light when the trailer air switch and the connection confirmation switch are activated. Installed inside the cab And a trailer brake operation indicator lamp which is provided, and a braking device for a combined vehicle, comprising: