JPH0433659B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a brake system for a coupled vehicle having a power unit dolly that applies braking force to the traveling of the coupled vehicle towed by a tractor and a power unit dolly.

(Prior Art) Conventionally, multi-coupled vehicles, in which coupled vehicles (trailer) are pulled by a tractor, have been used for transporting goods and the like. This type of connected vehicle has multiple turning points for connection, which causes a phenomenon where the tail of a fish shakes while the connected vehicle is running, or a jack-knifing phenomenon where the connected part is struck. .

To prevent these phenomena, connected vehicles,
That is, a trailer running device is provided with a trailer support body extending near the rear part of the underside of the trailer main body, a traveling device member including wheels that slide in the longitudinal direction, and a rail for preventing rotational movement of the traveling device member. This proposal is shown in Japanese Patent Application Laid-open No. 85765/1983.

(Problems to be Solved by the Invention) In the proposal shown in the above-mentioned Japanese Patent Application Laid-open No. 58-85765, multiple connected trailers are towed only by the power of the tractor, so An output trailer is required, and if the load distribution of the tractor is small relative to the load of the trailer being towed, there is a risk that the drive wheels of the tractor will spin and become unable to travel.

Furthermore, in the case of multi-connected vehicles that run at high speed and have a large payload and are pulled using a dolly with a power unit, conventionally there is no auxiliary brake device on the dolly side, and the braking force is insufficient with only the auxiliary brake device on the tractor side. Note that even if an auxiliary brake device is provided on the tractor and the dolly, if the operation of the auxiliary brake on the tractor side is detected and the auxiliary brake on the dolly side is activated, the braking force on the tractor side will be activated first. Furthermore, even if both auxiliary brakes are activated at the same time, if the exhaust brake is used as the auxiliary brake, the output of the power unit on the tractor side is greater than that on the dolly side, so the braking force on the tractor side will be large. In these cases, the braking force begins to operate from the front of the connected vehicle, causing a thrusting phenomenon from the rear, making the posture of the connected vehicle unstable, causing jack knifeing, and causing stability problems. produce a point.

The present invention has been made in view of these problems, and its purpose is to provide an auxiliary brake device on both the power units of the tractor and the dolly, so that when braking, the auxiliary brake on the dolly side is activated, and then the tractor To provide a brake device for a coupled vehicle having a dolly with a power device that applies braking force to the coupled vehicle by actuating the side.

(Means for Solving the Problems) According to the present invention, a dolly equipped with a power device is disposed between a tractor having a power device and a connected vehicle towed by the tractor, and the dolly is powered by a power device. The device is a power unit with a smaller output than the output of the power unit of the tractor, and an auxiliary brake device is provided in the power unit of the tractor and the dolly, and when braking the connected vehicle, the auxiliary brake device on the dolly side is operated, and then There is provided a brake system for a coupled vehicle having a dolly with a power unit, characterized in that it includes a control means for operating an auxiliary brake system on the tractor side.

(Function) Since the present invention has a power unit mounted on a dolly placed between connected vehicles towed by a tractor, it is possible to assist the tractive force of the tractor, and the arrangement of the dolly and the output of the installed power unit can be improved. Since this is made appropriate, stable running of the connected vehicles can be achieved without any disturbance in the running of the connected vehicles.

Furthermore, in the present invention, an auxiliary brake device is provided on both the power units of the tractor and the dolly, and when braking, the auxiliary brake device on the dolly side is first activated to apply braking force, and then the auxiliary brake on the tractor side is used to apply braking. Therefore, it has the effect of preventing the phenomenon of pushing up from the rear and the phenomenon of jack knifeing.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a structural block diagram showing one embodiment of a brake system for a coupled vehicle having a dolly with a power unit according to the present invention, and FIG. 2 is an explanatory diagram showing an example of a triple coupled vehicle.

In FIG. 2, reference numeral 1 denotes a tractor equipped with a power plant, which is positioned at the head of a connected vehicle and pulls a plurality of trailers following it. Wheels 1a indicated by double circles indicate driving wheels driven by a power device. 2 is a first trailer towed by the tractor 1, and a first dolly 3 is connected to the rear. The first dolly 3 is equipped with an engine 31 that assists the tractive force of the tractor 1, and drives the wheels 3a via a transmission 32 with a torque converter. And a second trailer 4 connected to the rear,
The third trailer 6 connected via the second dolly 5 is pulled, and the traction force of the tractor 1 is assisted to drive the connected vehicle.

Note that the output of the engine 31 mounted on the first dolly 3 is smaller than the output of the power unit of the tractor 1, for example, if the output of the power unit of the tractor 1 is 510
In the case of horsepower, the output of the power unit of the first dolly 3 is 330 horsepower, and the output ratio is about 6:4. As shown in the figure, it is disposed forward from the center of the connected vehicle to prevent the phenomenon of pushing up due to the driving force of the power unit of the first dolly 3 and the phenomenon of jack knife occurring in the connected portion.

In FIG. 1, reference numeral 11 is an engine that serves as a power unit for the tractor 1, and an exhaust brake 12 that serves as an auxiliary brake device is attached to the exhaust pipe 1b. Reference numeral 13 denotes a battery mounted on the tractor 1, which supplies power to the exhaust brake and a controller to be described later. Battery 13 and exhaust brake 12
An exhaust brake switch (EB switch) 14, an accelerator switch 15, a delay relay 16, and a clutch switch 1 are connected from the battery 13 side.
7 are inserted in series, and when all these electric circuits are turned on, voltage is supplied to the exhaust brake 12, and the operation of closing the exhaust pipe 1b of the engine 11 generates a braking force by the engine braking force. Note that the accelerator switch 15 and clutch switch 17 are switches that are turned on when the accelerator pedal and the clutch pedal are not depressed, and the delay relay 16 is normally a closed circuit, but when the signal RS from the controller 18 This is a relay that turns off the contact 16a when an input is received. Further, a signal line 18a is drawn out from between the accelerator switch 15 and the contact 16a, and is connected to input the exhaust brake operation signal EB to the controller 18. Reference numeral 19 is a key switch, which is a switch for operating the engine 11.

An exhaust brake 33 serving as an auxiliary brake device is attached to the exhaust pipe 3b of the engine 31 of the first dolly 3, and when the exhaust brake 33 is energized, it closes the exhaust pipe 3b, so that a braking force is generated. . 34 is a brake changeover switch;
This is a changeover switch that closes either the retarder solenoid valve 35 or the exhaust brake 33 according to the driver's instructions. Therefore, in the case shown in FIG. 1, current from controller 18 operates exhaust brake 33 via brake selector switch 34.

36 is a lock-up solenoid valve, which is attached to the transmission 32 with a torque converter of the engine 31. When the lock-up solenoid valve 36 is energized from the controller 18, it connects the engine 31 and the transmission 32 without going through the torque converter. It is directly connected to efficiently operate the engine braking force.

FIG. 3 is a processing flow diagram showing an example of the operation of this embodiment, and the operation will be explained with reference to the figure.

First, when the key switch 19 is operated to energize the controller 18, the controller 18 receives a signal.
RS is generated to energize the delay relay 16 and turn off its contact 16a (steps a and b). In this case, the delay relay 16 is activated in advance by
When activated at the same time as EB switch 14, contact 1
Since the mechanical operation to turn off the exhaust brake 6a is delayed from the electric signal, the exhaust brake 12 may be momentarily energized, so this is to prevent the flapping operation.

While driving, the connected vehicle requires braking force, so EB
When the switch 14 is turned on and the accelerator pedal is returned to the idle position, the accelerator switch 15 is turned on (steps c and d), and the EB signal is input to the controller 18 via the signal line 18a (step e).

In response to the input of the EB signal, the controller 18 energizes the lock-up solenoid valve 36, and then energizes the exhaust brake 33 of the engine 31 via the brake changeover switch 34 to activate the braking force of the exhaust brake of the engine 31 ( Steps f, g). At this time, if the brake changeover switch 34 is switched to the retarder solenoid valve 35 side depending on the road surface conditions on which the vehicle is traveling, the retarder is operated to provide auxiliary braking force, which acts as a braking force for the connected vehicle.

Then, when a predetermined time of t seconds, for example 0.5 to 1 second, has elapsed after the auxiliary brake is applied by the engine 31, the controller 18 de-energizes the delay relay 16 and turns on the contact 16a (steps h and i). . When the contact 16a is turned on and the clutch switch 17 is turned on without the clutch pedal being depressed, the battery 13 turns on the EB switch 1.
4→accelerator switch 15→contact 16a→clutch switch 17
2, the exhaust pipe 1b is closed and the exhaust brake by the engine 11 is activated to apply braking force to the connected vehicle (steps j and k).

Therefore, the exhaust braking force from the engine 11 is activated after a predetermined time (t seconds) after the auxiliary braking force from the engine 31 is activated.
Even during control, the connected vehicle maintains its normal posture and stops.

In addition, at step j, the clutch pedal is depressed, the tractor 1 coasts, the clutch switch 17 is turned off, and the exhaust brake 12 is turned off.
Even when the engine 31 is not operating, the signal RS is input to the controller 18 via the signal line 18a, so the auxiliary brake by the engine 31 is operating.
The vehicle behind the first dolly 3 is dragged by the coasting tractor, and the running attitude of the entire connected vehicle is not disturbed.

Although the present invention has been described above with reference to one embodiment, various modifications can be made within the scope of the gist of the present invention.
These are not excluded from the scope of the present invention.

(Effects of the Invention) As described above in detail, the present invention includes a power device mounted on a dolly, in addition to the traction force of the tractor at the head of the connected vehicle, and the traction force of this power device also pulls the connected vehicle. This eliminates the need for a particularly high-output tractor, and prevents the tractor drive wheels from spinning due to improper loading platform distribution.Also, since the output of the dolly's power unit is smaller than the output of the tractor's power unit, the connected vehicle This has the effect of stabilizing the running performance and maneuverability of the vehicle.

In addition, an auxiliary brake device is provided for each of the power units of the tractor and the dolly, and when braking the connected vehicle, the auxiliary brake device on the dolly side is activated, and then the auxiliary brake device on the tractor side is activated. In addition to providing sufficient braking force compared to when it is installed only on the tractor side, when braking the connected vehicle, the auxiliary brake of the dolly connected to the rear operates in advance, which prevents the phenomenon of pushing up from the rear. This also prevents the running posture of the connected vehicle from collapsing and causing jack knifeing.

Furthermore, since the torque converter is locked up when the dolly's auxiliary brake is activated, efficient braking force can be obtained.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing an example of a triple-connected vehicle,
FIG. 3 is a processing flow diagram showing an example of the operation of this embodiment. 1...Tractor, 3...1st dolly, 11...
Engine, 12... Exhaust brake, 14... Exhaust brake switch (EB switch), 15... Accelerator switch, 16... Delay relay, 17... Clutch switch, 31... Engine, 33... Exhaust brake.

Claims (1)

[Claims] 1. A dolly equipped with a power device is disposed between a tractor having a power device and a connected vehicle towed by the tractor, and the power device of the dolly has a smaller output than the power device of the tractor. An auxiliary brake device is provided in the power device of the tractor and the dolly, and control means is provided for operating the auxiliary brake device on the dolly side and then the auxiliary brake device on the tractor side when braking the connected vehicle. A brake device for a connected vehicle having a dolly with a power device, characterized by: