JP2547265Y2 - Brake load reduction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a brake load reduction device that includes a wheel brake and an exhaust brake, and simultaneously operates the exhaust brake in conjunction with the wheel brake.

2. Description of the Related Art Such a device is effective for a vehicle with a large number of people or a large load.

Referring to FIG. 2, the exhaust brake circuit A includes a fuse 1, an exhaust brake lever switch 2, a diode 3, a clutch switch 4 that closes when the clutch is connected, and a clutch switch 4 that closes when the accelerator pedal is released from the positive terminal of the power supply. An accelerator switch 5 and an exhaust brake valve 6 are interposed in series. An exhaust brake pilot lamp 7 is interposed in a circuit L2 branched from the lever switch 2 and the diode 3 of the circuit L1.

On the other hand, in the circuit L3 of the wheel brake circuit B, a fuse 8, a brake switch 9 and a stop lamp 10 are interposed in series from the positive side of the power supply. An interlocking circuit L4 branched from between the brake switch 9 and the stop lamp 10 of the circuit L3 is connected between the diode 3 of the circuit L1 and the clutch switch 4 via a diode 12. The circuits L1 to L3 are connected to a ground circuit L5. Therefore, when the brake pedal (not shown) is depressed to operate the wheel brake, the brake switch 9 closes,
The exhaust brake valve 6 is opened via an interlocking circuit L4 having a diode 12, and the exhaust brake is operated in conjunction with the wheel brake.

However, in such a device, the wheel brake and the exhaust brake always operate at the same time, and if the brake operation is performed while the vehicle is running at a low speed in the low speed range of the transmission when the vehicle is idle, the so-called “gap” due to the deceleration at the beginning of the braking effect is not obtained. Often it is pleasant. Also,
Since the exhaust brake is activated until just before the vehicle stops, the driver may feel uncomfortable due to a tapping sound from the drive system or the occurrence of engine swing due to clutch operation.

Regarding the exhaust brake, the present applicant has proposed in Japanese Utility Model Publication No. 55-85538 an exhaust brake device that locks an exhaust brake valve in a low speed range.

Although this proposal is effective, it does not relate to a technology in which an exhaust brake is linked to a wheel brake.

Japanese Patent Application Laid-Open No. Sho 59-120741 discloses a technique in which a wheel brake and an exhaust brake are linked to operate and stop an exhaust brake according to a vehicle speed. However, since such a known technique aims at improving the braking force, it is not possible to eliminate the discomfort of "starting" immediately before and immediately after stopping the brake.

Further, Japanese Unexamined Utility Model Publication No. 59-47329 discloses a technique for releasing an exhaust brake at a certain vehicle speed or lower in order to prevent an engine stop in a torque converter vehicle. However, such known techniques do not eliminate the discomfort associated with the wheel brakes.

Japanese Utility Model Application Laid-Open No. 60-1935 discloses a technique for interlocking a wheel brake and an exhaust brake at a certain vehicle speed or higher. However, such a known technique is at a speed equal to or higher than a certain vehicle speed, so that the aforementioned discomfort immediately before stopping cannot be eliminated.

[Problem to be Solved by the Invention] Accordingly, an object of the invention is to provide a brake load reduction device that eliminates discomfort at the beginning of braking and immediately before stopping due to simultaneous operation of a wheel brake and an exhaust brake.

[Means for Solving the Problems] According to the present invention, when the clutch is released from the clutch pedal (4) and the accelerator pedal, the exhaust brake lever switch (2) is closed in series with the diode (3) from the power supply. Exhaust brake circuit (A) with close switch (5) and exhaust brake valve (16) connected
And a wheel brake circuit (B) in which a brake switch (9) and a stop lamp (10) are connected in series from a power supply, and the exhaust load is operated simultaneously with the wheel brakes. In the mitigation device, a speed-linked output circuit (C) for stopping the operation of the exhaust brake when the detection signal from the speedometer (18) is relatively low is provided, and the speed-linked output circuit (C) is provided with a stop lamp ( A normally closed brake relay (13) that opens and closes an interlocking circuit (L6) that branches off from the wheel brake circuit (B) to turn on 10) and connects to the exhaust brake circuit (A), and its brake relay (13) And a switching circuit (17) interposed between the power supply and the power supply. A speedometer (18) for outputting a vehicle speed signal is connected to the switching circuit (17). , The switching circuit (17) is relatively low speed range outputs exhaust brake stop signal, and has a relatively function of outputting the exhaust brake actuation signal in the high speed range.

[Explanation of effect] Therefore, relatively high speed (for example, 15 km / h or more)
When the vehicle is traveling at a speed, a switching circuit outputs an exhaust brake operation signal according to a signal from a speedometer.

In this case, the speed is high, so "gakun" during braking
Almost no discomfort. When the vehicle speed becomes relatively low (for example, 12 km / h or less) as the vehicle speed decreases, the coil is excited by the exhaust brake stop signal from the switching circuit, the brake relay is opened, and the interlocking output circuit is shut off. Therefore, even if the wheel brake is operated, the exhaust brake does not operate. Therefore, discomfort at the time of stoppage can be eliminated.

Similarly, when the brake is operated at a relatively low speed, the exhaust brake does not operate.

Therefore, according to the present invention, it is possible to prevent discomfort during the operation of the exhaust brake.

As described above, according to the present invention, in a vehicle having a conventional exhaust brake circuit and a wheel brake circuit, a speed-linked output circuit may be attached, and the connection work may be simply connection of a relay contact or the like, and is therefore simple. Yes,
Conventional products can be easily improved. Further, there is no influence on the mechanical parts, the control device, and the like, and therefore, the present invention can be suitably applied to a vehicle having an exhaust brake.

Embodiment An embodiment of the present invention will be described below with reference to FIG. Note that, in FIG. 1, the portions corresponding to FIG.
The same reference numerals are given and duplicate explanations are omitted.

In FIG. 1, a diode 3 and a clutch switch 4
Is connected between. The interlocking circuit L6 is a normally closed brake relay 13 between the exhaust brake circuit A and the wheel brake circuit 13.
Connected through. Terminal 1 of that brake relay 13
4 and 15 are circuits L constituting the wheel brake circuit B, respectively.
3 and the interlocking circuit L6.

On the other hand, a switching circuit 17 composed of an amplifier is interposed in a circuit L7 branched from the fuse 1 and the exhaust brake lever switch 2 of the circuit L1 constituting the exhaust brake circuit and connected to the earth circuit L5. I have. The switching circuit 17 is connected to a speedometer 18 that outputs a vehicle speed signal, which is a speed detection circuit, by a circuit L8, and is connected to a ground circuit L5 via a coil 16 of a relay 13 by a circuit L9. The meter 18, switching circuit 17, and brake relay 13 constitute a speed-linked output circuit C. And the switching circuit 17
When the value of the detection signal from the speedometer 18 is relatively low, for example, 12 km / h or less, the circuit
Outputs a volt exhaust brake stop signal, for example, 15
In the relatively high speed range of km / h or more, it outputs a zero volt exhaust brake operation signal.

Therefore, in a relatively low speed range, the terminals 14 and 15 are opened by energizing the relay coil 16 and the brake switch 9
, The exhaust brake valve 6 does not operate, and the exhaust brake does not operate in conjunction with the wheel brake.

In a relatively high speed range, the brake relay 13 is closed, and when the brake switch 9 is closed, the exhaust brake operates in conjunction.

[Effects of the Invention] As described above, the present invention has the following excellent effects.

(I) When the brake is operated at a relatively high speed, the wheel brake and the exhaust brake operate, and the brake is operated efficiently, and there is no discomfort when the exhaust brake is operated.

(Ii) Since the exhaust brake does not operate during relatively low-speed running or low-speed running due to a decrease in vehicle speed, there is no discomfort when the exhaust brake is operating and when it stops.

(Iii) Therefore, when the wheel brake is linked to the exhaust brake, it is possible to eliminate discomfort and improve the braking efficiency.

(Iv) Just connect the speed-linked output circuit.
Improvements to conventional products can be made easily and easily.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing the entire structure of an embodiment of the present invention, and FIG. 2 is a drawing corresponding to FIG. 1 showing a conventional device. A: Exhaust brake circuit, B: Wheel brake circuit, C
…… Speed-linked output circuit, L6 …… Linked circuit, 13 …… Brake relay, 17… Switching circuit, 18 …… Speedometer

Claims (1)

(57) [Scope of request for utility model registration] 1. A clutch switch (4) which closes when a clutch is connected to a diode (3) and a switch (5) which closes when an accelerator pedal is released from a power supply, and an exhaust brake valve (2). 1
6), and a wheel brake circuit (B) to which a brake switch (9) and a stop lamp (10) are connected in series from a power supply. In a brake load reducing device that simultaneously operates the exhaust brakes in conjunction with each other, a speed-linked output circuit (C) that stops the operation of the exhaust brakes when the detection signal from the speedometer (18) is relatively low is provided. The speed-linked output circuit (C) is provided with a normally closed circuit for opening and closing a linked circuit (L6) connected to an exhaust brake circuit (A) branched from a wheel brake circuit (B) for lighting a stop lamp (10). It consists of a brake relay (13) and a switching circuit (17) interposed between the brake relay (13) and the power supply. A speedometer (18) for outputting a signal is connected, and the switching circuit (17) has a function of outputting an exhaust brake stop signal in a relatively low speed range and outputting an exhaust brake operation signal in a relatively high speed range. A brake load reducing device characterized by the following.