JPS60206757A - Car brake device - Google Patents

Abstract

PURPOSE:To assure safety of crew by automatically holding the brake force upon stoppage of car while automatically releasing the brake force which has been maintained through accelerating operation. CONSTITUTION:During stoppage of car, service brake force is maintained even if the foot is separated from the brake pedal because the keep switch 3 is closed. Upon transfer to the starting operation and stepping of an accelerator pedal, a normal close switch 63 will close to supply power to the reset side coil 64 of a latch-in relay 65 thus to open the keep switch 3. Consequently, power is interrupted from the electric operational valve 1 thus to release the fluid pressure of service brake automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid-operated braking device such as a hydraulic brake or an air brake, which secures braking force and improves safety when passenger cars, trucks, buses, and other vehicles are stopped. This article relates to a braking device for ILF images.

In conventional vehicle braking systems, when the vehicle temporarily stops at an intersection etc. while driving, the brake pedal must be continuously depressed to hold the service brake. In comparison, the braking force was low, and the braking force was not sufficient to prevent a rear-end collision while the vehicle was stationary. In addition, I vehicles equipped with automatic transmissions have the disadvantage that unless the shift lever is changed to the neutral or parking position, the vehicle will advance by 11iI due to a so-called creep phenomenon. To overcome this problem, a system has been proposed in which an electromagnetic force locking device is placed on the brake pedal (Japanese Unexamined Patent Publication No. 58-202140), but in this case, the electromagnetic force can be controlled by a computer. Since it is controlled, it is expensive, the computer is unreliable, and the brake system, which is an important safety component, lacks safety.

The present invention has been made in view of the above points, and its purpose is to automatically hold the service brake force when the vehicle is stopped while driving, to ensure braking force while the vehicle is stopped, and to improve safety. The purpose of the present invention is to provide a braking device for a vehicle that is inexpensive and highly reliable.

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. An electrically operated valve 1 disposed in the fluid system of a hydraulic service brake is a two-way normally open solenoid valve, and a brake operating means 2
is a brake pedal, and the solenoid valve and booster i'i l 5 are connected to the oil passage 14 that communicates the master cylinder 12 operated by the brake pedal with the oil brake + 3 installed in the wheel. It is located. The solenoid valve has an inlet 16 and an outlet 17, and a coil 19 is disposed surrounding the outer periphery of a valve body 18, and is pressed against a valve seat 20 in the valve body by a first spring 21. The movable valve body 22 to be biased is fitted so as to be slidable left and right inside the valve body, and has an outer circumferential ring 23 , a through hole 24 , and a protruding valve seat 25 . Inside the movable core 27, which is fitted so as to be slidable left and right inside the valve body and has a slit 26 on its outer periphery, is a valve body 29 that is pushed rightward by a second spring 28. It is slidably fitted into the In addition, 30 is a hole; 1 is a crimp for IB2B2 of the second spring, a core 32 surrounding the coil 19 and a movable valve body 22
and ij) The moving iron core 27 is manufactured with magnetic side slopes. The power supply circuit connected to the power source 33 of the solenoid valve includes vehicle speed detection means 4.
A keep switch 3 that maintains the closed state in response to the acceleration operation means 6 (accelerator pedal) and opens in response to the acceleration operation means 6 (accelerator pedal), and a brake detection switch that responds to the brake operation means 2 and stops both Y1f and sometimes ■J. 7 and a driving detection switch 9 that responds to the driving start means 8 and closes while the vehicle is driving are connected in series.

The keep switch 3 is a make contact of an electromagnetic launch-in relay 65, and once activated, it maintains its operating state until it returns to its original state, and may be mechanically locked. . Also, 1g for the latch-in relay!
It is possible to replace it with an electronic circuit, an IC switch, or a mechanical means without specifying the specifics. The vehicle speed detection switch 5 is a normally open switch that is used when the vehicle is stopped (below the set vehicle speed).
In the embodiment, the switch 51 that closes when the vehicle speed of the iJi vehicle becomes lower than the set speed at the oil field 41 and the wind pressure detecting plate 42 of the vehicle when the wind pressure is lower than the set wind pressure. A switch 52 is connected in series to close the switch when . Furthermore, the vehicle speed detection means 4 detects one of the wheels 1Ilb.
A rotation sensor that rotates due to a transmission detector or a running wind pressure.
It may be set to I.

In addition, in the example, 14T and two switches 51 and 52 were connected in series as the speed detection switch.
High speed le? At ``t'' 119, water formed between the vehicle's wheels and the road surface (high 10 planing phenomenon), and when the brakes were applied, the wheels were locked (the wheel rotation speed was zero), but This is because the braking force is not maintained when the actual running speed is high, so it is possible to omit one of the switches.The driving detection switch 9 is a normally open switch and is the driving starting means 8. It closes in response to a key switch.

To explain the operation, Figure 1 shows before the start of Renden, and since the driving detection switch 9 is open, the electromagnetic valve is energized while the vehicle is parked, and unnecessary service brake force is prevented from being applied. .

While driving, the driving detection switch 9 is activated in conjunction with the key switch.
closes. When the brake pedal is pressed to stop the vehicle while driving, normally open switch 7 or aJ is activated. Then, when the 'LIL speed becomes low and +li and droplet detection switch 5 are closed, the center side coil 62 of the launch-in relay is energized and the keep switch 3 is closed, the solenoid valve is energized and the service brake is activated. Automatically maintains fluid pressure. In this embodiment, a heavy speed detection switch 52 that responds to the wind pressure detection plate 12 is connected to the power supply circuit of the coil 62, so that the so-called hydroplaning phenomenon occurs when driving in the rain. Even if the brake is locked (apparently the vehicle speed is zero), the solenoid valve is not opened unnecessarily and the brake fluid pressure is not maintained.

Regarding the operation of the electromagnetic valve, when it is not energized, one fluid of the brake 9 flows in from 116 through the slit 2G, passes through the through hole 24 or the slit 23, compresses the first spring 2I, and connects the valve seat 20 and the movable valve. Turn the body 22 and exit to the outlet 17 to apply braking force to the wheels. J11 Electric +
The movable valve body 22 and the movable iron core 27 are attracted to +r7, and the valve body 29 is seated on the protruding valve seat 25 (↓) The through hole 24 is blocked (see Fig. 2). Therefore, Leak D]
The fluid pressure on the 7 side is controlled by the valve seat 20 and the movable brake body 22.
i seat, 1-1, protruding valve seat 25 and valve body 29 force' /IT
Since it is l'14, it is saved by 4.7. At this time, the excessive pressure is caused by the force of the second spring 28. 1) Push the valve body 2) to the left to remove the protruding valve seat 25 and release the valve. Furthermore, when the brake fluid pressure is increased by pressing the brake pedal again (4゛-), the force of the first spring 21 is applied to push the movable valve body 22 to the right.
1-: (Since the J force is removed from the valve seat 20, the additional depression is +, iJ function, and the optimum fluid force can always be obtained.

When the vehicle is stopped, even if the brake pedal is taken off, the keep switch 3 remains closed, so the service brake is maintained. The vehicle will not move forward and the creep phenomenon will be prevented, making driving safer and making it easier to shift to the parking position at intersections.

In addition, even in the case of a vehicle equipped with a manual transmission, the braking force at an intersection can be automatically maintained, and the safety of personnel can be ensured in the event of a rear-end collision with a sufficient braking force even if the driver takes his or her foot off the brake pedal.

Next, when the start operation is performed from the stopped iIL state and the accelerator pedal is pressed, the normally open type switch 3 is closed, the reset side coil 64 of the laminate relay 65 is energized, the keep switch 3 is opened, and the electrically operated valve 1 The fluid pressure in the service brake is automatically released when the power is cut off.

Next, another embodiment of the vehicle braking device of the present invention will be explained with reference to FIG. 3 (the description of the same parts as in FIG. 1 will be omitted). A keep switch 111 is arranged in the electrically operated valve circuit 33 for controlling the fluid pressure, which maintains the closed state in response to the vehicle speed detection means 4 and opens in response to the acceleration operation means 6. The keep switch 3 is a make contact of an electromagnetic latch-in relay 65, and the vehicle speed detection switch 5 and the brake detection switch 7 are connected in series to the power supply circuit of the seso I side coil 62, and the reset side coil 64 is connected in series. A normally open switch 3 is connected to the power supply circuit. Note that both iI'm,'(tlI] and the traveling wind pressure detection plate 42 are shown as the vehicle speed detection means 4, or either one can be omitted. Stepping into a certain 7 legibudal, the tonne speed decreased and l!
) 5 detection switches and 70 control detection switches,!
1 closes, the seventh node side coil 62 of the latch-in relay
is excited, the keep switch 3 is closed, the electrically operated valve is energized, and the fluid system pressure of the braking device is automatically maintained at 4.5. And when the car is stopped, the keep switch closes even if you take your foot off the pedal.

The brake force is automatically maintained.

When the engine moves to the starting operation and operates the acceleration operation means 6 ('accelerator pedal) to close the normally open switch 03,
The reset side coil 64 of the latch-in relay is energized, the keep switch 3 is opened, and the energization to the 1U air-operated valve is cut off.The hiss brake force is automatically released.

The electrically operated valve 1 of the present invention is not limited to a 'Lu magnetic valve, but can be changed to a 'lu valve or other type, the keep switch 3 may be either mechanical or electrical, and the braking device may be either a hydraulic type or an air service brake. Can be adopted.

As described above in detail, the present invention provides a fluid-operated brake system 1 for a vehicle in which a fluid pressure control valve 1 for controlling fluid pressure is disposed in a fluid system of the brake system. A keep switch 3 which maintains the closed state in response to the means 4 and opens in response to the acceleration operation means 6 and IA 8 connects the keep switch 3 to the power supply circuit of the electrically operated valve and brake detection which responds to the brake operation means 2. Since the switch 7 is provided to maintain the braking force when the vehicle is stopped, JIH automatically controls the acceleration operation when the braking force is maintained even if the brake operation means 2 is not operated when the vehicle is stopped. 1. It was possible to provide a vehicle braking device in which the power is automatically released, and the structure is simple and inexpensive;
Dogs are highly reliable and can ensure the safety of passengers when vehicles are stationary, making them a great contribution to the industry.

FIG. 2 is a partial new diagram showing a different operating state from FIG. 1, and FIG. 3 is a partial explanatory diagram showing another embodiment of the present invention.

1... Electric operation brake r 2... Brake operation means: U... Key switch 1... Heavy speed detection means 5... Car d Detection switch (U... Acceleration operation means 7... Brake detection switch 'l, I'j'l Applicant Keihin Seiki Seisakusho Co., Ltd. Representative Watabiki 4th Department

Claims (1)

[Claims] (]) An electrically operated valve 1 for controlling fluid pressure is arranged in the fluid system of the braking device a!B! , in both fluid-operated brake devices 1'1°, the keep switch 3 is connected to the power supply circuit of the electrically operated valve to maintain the closed state in response to the vehicle speed detection means 4, and to open the brake switch 3 in response to the acceleration operation means 6. A braking device for a vehicle, which is equipped with a braking detection switch 7 that is connected to a braking operation means 2 and responds to a braking operation means 2, and maintains braking force when the vehicle is stopped. (2) A braking device for a vehicle according to claim 1, wherein the i'+tJ keep switch 3 and the brake detection switch A are connected in series to the power supply circuit of the electrically operated valve 1. (3) The keep switch 3 is a contact point of an electromagnetic latch-in relay, and the seven-side coil circuit of the latch-in relay includes a vehicle speed detection switch 5 and a brake detection switch 7, which respond to the vehicle speed detection means 4 and close when the vehicle is stopped. A braking device for a vehicle according to claim 1, item 1&, which is formed by connecting these in series.