JPS5948191B2 - Brake pressure filling device for coupled vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tractor (towing vehicle) equipped with a spring brake device that can perform emergency braking by sensing an abnormal drop in the pressure of a near reservoir for air brake operation or by manual operation, and a near reservoir of the tractor. It consists of a trailer equipped with an emergency brake piping system that can automatically perform emergency braking of the trailer by sensing a drop in pressure in the emergency line for supplying air to the air reservoir of the trailer tractor. This invention relates to a braking pressure filling device for a coupled vehicle, which is capable of simultaneously filling a near reservoir of a tractor and a near reservoir of a trailer with pressure while at least the emergency brake of the tractor is kept in place.

Figure 1 (4) is an example of the conventional piping for the emergency air brake system in a coupled vehicle, in which the part 1 surrounded by the chain line is on the tractor side, TI! indicates the trailer side.

In the figure, 1 is a near compressor, and compressed air generated here passes through a pipe 2 and is stored in a near reservoir 3.

A conduit 6 is formed from this near reservoir 3 to a spring brake chamber 5 via a spring brake control valve 4.

As long as the pressure in the near reservoir 3 is normal, the spring brake can be operated by pulling the knob 48 of the spring brake control valve 4 to make the valve 4 conductive.
Air flows into the spring brake chamber 5 to maintain the emergency brake spring force in the brake release position.

In addition, a hose coupling 8 is connected to a hose coupling 8 through a pipe 7 branched from a pipe 6 downstream of the spring brake control valve 4.
Compressed air is also normally stored in the near reservoir 10 on the trailer side by a pipe that passes through the compressed air, reaches the relay emergency valve 9, and further reaches the near reservoir 10.

In this case, the line 7 is called an emergent line.

Reference numeral 11 in FIG. 1 is a foot-operated brake valve, and when the brake pedal 11a is depressed, pressure corresponding to the amount of depression is discharged into the conduit 12.

This conduit 12 then reaches a relay emergency valve 9 via a hose coupling 13.

In this case, conduit 12 is a service line.

In a normal state, the relay emergence valve 9 performs the same function as a general relay pulp.

In other words, the service line 12 by the brake valve 11
A pressure corresponding to the change in pressure is supplied from the near reservoir 10 to the air chamber 14 to operate the service brake.

If the pressure difference between the near reservoir 10 and the emergent line 7 becomes abnormally large, or if the pressure in the emergent line 7 abnormally decreases regardless of the near reservoir 10, the total pressure in the near reservoir 10 will decrease. The air is automatically sent to the air chamber 14 to apply the emergency brake on the trailer.

On the other hand, if some kind of failure occurs in the brake system of the tractor and the pressure in the near reservoir 3 abnormally drops to a pressure insufficient for normal braking, the spring brake control valve 4 senses this and the knob 4. automatically draws in the air in the pipe line 6 to the control valve 4.
Emit more.

Accordingly, the air contained in the spring brake chamber 5 is also released, the spring force holding the brake in the brake release position is released, and the spring brake operates as an emergency brake.

In this case, naturally the emergency line 7 pressure also decreases abnormally, but this does not necessarily lead to automatic operation of the relay emergency valve 9.

Therefore, as shown by the dotted line in the figure, from the near reservoir 3 to the conduit 15
If a synchro valve 16 is provided that detects the pressure introduced through and cuts the supply pressure to the emergent line 7 when the pressure decreases, in this case, the pressure of the emergent line 7 will be forcibly lowered. The emergency brake can also be applied to the trailer side.

In addition, the spring brake device as described above causes the knob 4 of the spring brake control valve 4 not only when the pressure in the near reservoir 3 is abnormally low but also when the pressure in the near reservoir 3 is normal. The spring brake can be activated by manually pushing in L, and is used for parking, etc.

FIG. 1B shows a vehicle equipped with a spring brake on the trailer side instead of the relay emergency valve described above.

That is, in a normal state, the relay valve 21 supplies pressure corresponding to the pressure change in the service line 12 from the near reservoir 10 to the air chamber 23 through the pipe line 22,
The regular brake is working.

At this time, the relay pulp 24 is removed from the near reservoir 10.
Pressure is supplied to a spring brake chamber 26, which is integrally constructed with the air chamber 23, through a conduit 25 interposed therein, and maintains the spring force for the emergency brake at the brake release position.

When the pressure in the emergency line 7 decreases, the relay pulp 24 reduces the pressure supplied to the spring brake chamber 26 and releases the spring force that was held at the brake release position. , the spring brake is activated as an emergency brake.

However, in any of the above conventional examples, the tractor and trailer stop in a connected state, and the pressure in the near reservoir 3 becomes abnormally low after a drain operation, after being left unused for a long time, after repairing an air failure, etc., or when the atmospheric pressure In this case, the engine is started before the vehicle starts, and the near compressor 1 fills the near reservoir 3 with compressed air at a pressure higher than the specified pressure. If the fuel is filled as is, the near reservoir 3 pressure will rise normally, but the near reservoir 10 on the trailer side will not be filled because the emergent line 7 is blocked by the spring brake control valve 4.

Then, since the low pressure alarm is canceled in the driver's seat, when the spring brake control pulp 4 is operated to start and the parking brake is released, the compressed air in the near reservoir 3 of the tractor is immediately conducted through the emergency line 7. It will be supplied to the near reservoir 10 of the trailer.

Therefore, the pressure in the near reservoir 3 of the tractor drops rapidly, the alarm device is activated, and the tractor becomes unable to start again.

So, once again, check the spring brake control valve 4.
The operation consists of brake peg 1 and 11. There was a problem where the vehicle had to be stopped and wait for refilling.

Furthermore, if the above-mentioned filling is performed while the parking brake is not operating (that is, the spring brake control valve 4 is in a conductive state, but the spring brake is operating because the line pressure is low), the pressure in the near reservoir 3 of the tractor will increase. Accordingly, the spring brake of the tractor is released, and the emergency brake of the trailer is also released at the same time.

Therefore, as the pressure in the near reservoir 3 increases, the ability of the vehicle to stop and hold the vehicle decreases, which is extremely dangerous.

Therefore, the present invention solves the above-mentioned problems by making it possible to simultaneously fill the tractor's near reservoir and the trailer's near reservoir with pressure while the tractor's emergency brake is kept in place. It also aims to improve safety by activating the emergency brake or service brake of the trailer during the pressure filling.

Embodiments of the present invention will be described in detail below with reference to FIGS. 2 to 6.

FIG. 2A shows an example in which the present invention is applied to the conventional example shown in FIG. 1A1.

That is, separately from the emergency line 7, a conduit (supply line) 35 is provided which directly communicates the near reservoir 3 of the tractor with the near reservoir 10 of the trailer via a hose coupling 36.

Therefore, regardless of whether the emergency brake on the tractor side is activated by the spring brake control valve 4 or the emergency brake on the trailer side is activated by the relay emergency valve 9, pressure can be filled into the near reservoir 10 of the trailer through the supply line 35. .

Similarly, an operation valve 37 may be provided on the supply line 35 as shown by the dotted line in the figure, and opened only during pressure filling.

Further, FIG. 6 (6) shows a modification in which a spring brake is installed on the trailer side, and it works in the same way.

As described above, in this case, the near reservoirs 3 and 10 of the tractor and trailer can be simultaneously filled with pressure while the emergency brakes of the tractor and trailer are kept in place.

Next, the embodiment shown in FIG. 3 will be described.

In the figure, 40 is an inversion and relay valve, which compares the pressure PL directly led from the near reservoir 3 with the pressure P2 led via the spring brake control pulp 4, as shown in detail in FIG.
In the case of normal Pl=P2, the brake pedal 11
Service line 1 adjusts the discharge pressure according to the amount of depression of 8.
However, as Pl>P2, the service line 12 pressure is increased regardless of the operation of the brake pedal 11a.

For example, when the pressure in the near reservoir 3 decreases, no pressure is supplied to the spring brake chamber 5 due to the operation of the spring brake control valve 4 as described above, and due to the pressure decrease in the emergency line 7, the pressure in the spring brake chamber 26 of the trailer decreases. When there is no supply and emergency braking is applied to the tractor and trailer, if the near reservoir 3 is filled with pressure by the operation of the near compressor 1, the near reservoir 10 is filled through the emergency line 7.
Pressure filling can also be performed.

At this time, the spring brake chamber 5 of the tractor
Although there is no pressure supply to the tractor and the tractor is under emergency braking,
On the trailer side, as the emergency line 7 pressure increases, the pressure supplied to the spring brake chamber 26 increases and the emergency brake is released.

At this time, the above inversion and relay pal 7
'40 detects an increase in the emergency line 7 pressure, that is, the P□ pressure, and increases the service line 12 pressure.

Therefore, pressure is supplied to the regular braking air chamber 23 of the trailer through the relay valve 21, thereby ensuring braking force.

In this way, pressure can be filled into the near reservoirs 3 and 10 of the tractor and trailer at the same time while the emergency brake of the tractor is kept applied, and the service brake can be activated as an emergency when the emergency brake of the trailer is released. It can also hold the brake.

In addition, FIG. 5 shows a modification of the above embodiment in which a manually operated valve 30 is inserted in the piping, and FIG. 6 shows the portion surrounded by dotted lines in FIGS. 3 and 5. In this embodiment, an inversion valve 41 and a tab check valve 42 are used in place of the inversion and relay valve 40, and these both perform the same functions as in the above embodiment.

As described above, according to the present invention, the near reservoirs of the tractor and trailer can be simultaneously filled with pressure while the emergency brake of the tractor is kept in place.

In this case, an emergency line is branched from the spring brake device side of the spring brake control valve, and separately from this emergent line, the near reservoir of the tractor and the near reservoir of the trailer are directly connected, and the near reservoir of the trailer is connected directly to the near reservoir of the trailer. If a supply line is provided to supply filling pressure to the near reservoir of the trailer, the above can be done while the emergency brake of the trailer is also kept in place.

In addition, the emergency line is branched from the air reservoir side pipe from the spring brake control valve, and the emergency brake service line is connected to the trailer side by connecting the pressure of the emergency line and the spring brake control valve to the spring brake equipment side pipe. If the system is equipped with a valve device that increases the service line pressure according to the difference between the brake service line pressure and the

When the emergency brake of the trailer is released, the service brake is activated in an emergency manner, and the trailer can still be kept under braking.

[Brief explanation of the drawing]

FIG. 1 is a piping diagram of a conventional example, and FIGS. 2 to 6 are piping diagrams of an embodiment of the present invention. 1... Near compressor, 3, 10... Near reservoir, 4... Spring brake control valve,
5.26... Sprinkle Rake Chamber, 1...
Emergence line, 9... Relay emergency valve, 12... Service line, 14, 23... Air chamber, 30... Operation valve, 35... Supply line, 40... In Version and relay valve, 41...inversion valve.

Claims (1)

[Scope of Claims] 1. A tractor equipped with a spring brake device that performs emergency braking by sensing an abnormal drop in air brake operating near reservoir pressure or by manual operation, and an emergent system that supplies air from the tractor's near reservoir to the trailer's near reservoir. A trailer equipped with an emergency brake piping system that can sense a drop in line pressure and perform emergency braking,
In a connected vehicle consisting of a tractor, the supply pressure to the spring brake device is brought within the operating range of the spring brake device by sensing an abnormal drop in the near reservoir pressure or by manual operation in the pipe connecting the near reservoir of the tractor and the spring brake device. A spring brake control pulp is provided to suppress the spring brake control pulp, and an emergent line is branched from the spring brake device side pipe from this spring brake control pulp, and separately from this emergent line, the near reservoir of the tractor and the near reservoir of the trailer are directly connected. 1. A braking pressure filling device for a coupled vehicle, characterized in that a supply line is provided which communicates with the vehicle and supplies filling pressure to a near reservoir of a toller. A tractor equipped with a spring brake device that performs emergency braking by sensing an abnormal drop in near reservoir pressure for 2-engine brake activation or by manual operation, and a pressure drop in the emergency line that supplies air from the tractor's near reservoir to the trailer's near reservoir. In a coupled vehicle consisting of a trailer equipped with an emergency brake piping system that can sense and perform emergency braking, an abnormal drop in near reservoir pressure is detected or artificially detected in the piping connecting the near reservoir of the tractor and the spring brake device. A spring brake control pulp is provided that controls the supply pressure to the spring brake device within the operating range of the spring brake device by operation, and an emergent line is branched from the air riser side pipe from this spring brake control pulp to the trailer side. The service brake service line is characterized by being provided with a valve device that increases the service line pressure for the service brake in accordance with the difference between the pressure in the emergency line and the pressure in the conduit on the spring brake device side from the spring brake control pulp. Brake pressure filling device for connected vehicles.