JPS61163051A - Braking device of automobile - Google Patents

Abstract

PURPOSE:To make it possible to modify a brake force according to a running condition and a driver's preference, by manually adjusting an amount per unit time of an atmospheric pressure flowing into an operating pressure chamber of a vacuum booster. CONSTITUTION:A variable throttle valve 10 is provided in an atmospheric pressure flow passage 5 to throttle an area of the passage 5. A throttle degree of the variable throttle valve 10 is controlled through a controller 18 by closing a manual switch 17. Accordingly, a brake force may be suitably adjusted according to a driver's preference and a running condition by closing the manual switch 17 and thereby adjusting the throttle degree of the variable throttle valve 10, since an amount per unit time of an atmospheric pressure flowing into a second operating pressure chamber 3b of a booster 3 is dependent upon the throttle degree.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a braking device for an automobile, and in particular to an improvement in a braking device that allows the braking action to be performed manually in order to reduce the operating effort of the driver. .

(Prior Art) Conventionally, as a brake device for this type of automobile, for example, as disclosed in Japanese Utility Model Publication No. 36-27131,
It is equipped with a vacuum booster (vacuum booster @), an atmospheric pressure inflow passage for causing atmospheric pressure to flow into the working pressure chamber of the vacuum booster, and a negative pressure chamber that communicates and connects the negative pressure chamber of the vacuum booster to a negative pressure source. A pressure passage, a valve means for controlling the inflow and discharge of atmospheric pressure into and out of the operating pressure chamber of the vacuum booster through the atmospheric pressure inflow passage, and a manual operation means for controlling the operation of the valve means. When it is necessary to drive, especially when slow deceleration is required to maintain a distance between the vehicle and the vehicle in front, the valve means is opened by manually operating the manual operation means described above instead of the normal operation of depressing the brake application lever. By letting atmospheric pressure flow into the working pressure chamber of the vacuum booster, a pressure difference is created between the working pressure chamber and the negative pressure chamber, and this pressure difference acts on the vehicle to apply a slight force to the brakes. A vehicle is known that eliminates the need to press the pedal, thereby reducing the driver's operating effort.

(Problems to be Solved by the Invention) However, in the above conventional system, the amount of atmospheric pressure flowing into the working pressure chamber of the vacuum booster per unit time based on the opening operation of the valve means is a predetermined value. Therefore, the manual brake force is always uniquely determined to a fixed value according to this, and as a result, depending on the driving situation, it may be too effective or too gentle, and the brake force may not be obtained according to the driver's preference. I was disappointed that there wasn't one.

The present invention has been made in view of the above, and its purpose is to supply atmospheric pressure to the working pressure chamber of the vacuum booster in an automobile brake system that generates braking force by manual operation as described above. By manually adjusting the amount of inflow per unit time, the braking force can be varied depending on the driving situation and the driver's preference, improving driving safety.

The purpose is to improve maneuverability.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention, as shown in FIG. An atmospheric pressure inflow passage 5 for causing atmospheric pressure to flow into the chamber 3b, a negative pressure passage 7 that communicates and connects the negative pressure chamber 3C of the vacuum booster 3 to the negative pressure source 8, and a vacuum booster using the atmospheric pressure inflow passage 5. a valve means 14 for controlling the inflow and discharge of atmospheric pressure into the working pressure chamber 3b of No. 3, and the valve means 14;
and manual operation means 17 for controlling the operation of. In addition, it is configured to include a passage throttling means 10 for narrowing the passage area of the atmospheric pressure inflow passage 5, and a manual adjustment means 16 for manually adjusting the degree of constriction of the atmospheric pressure inflow passage 5 by the passage throttling means 1°. It is.

(Function) With the above configuration, in the present invention, the degree of restriction of the atmospheric pressure inflow passage by the passage restricting means is appropriately adjusted by manual operation of the manual adjustment means, so that the atmospheric pressure is transferred to the working pressure chamber of the vacuum booster. The amount of inflow per unit time is changed accordingly, making it possible to set the manual braking force to a value that corresponds to the driving situation or the driver's preference.

(Example) Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes a brake pedal, and a vacuum booster 3 and a mask cylinder 4 are sequentially connected to the brake pedal 1 via an operating rod 2, and the mask cylinder 4 is connected to the front and rear wheels. Cylinders (not shown) are connected in communication, and when the brake pedal 1 is depressed, hydraulic pressure is applied to the wheel cylinders of the front and rear wheels.

The vacuum booster 3 transmits the depression operation of the brake pedal 1 to the mask cylinder 4, and also has a first working pressure chamber (not shown) into which atmospheric pressure flows in due to the depression operation of the brake pedal 1, and a negative pressure acts thereon. It has a first negative pressure chamber (not shown), and when the brake pedal 1 is depressed, a pressure difference is generated between the first working pressure chamber and the first negative pressure chamber, and based on this pressure difference, the brake The depression force of the pedal 1 is increased by 1a.

The vacuum booster 3 also includes a diaphragm 3.
A second working pressure chamber 3b and a second negative pressure chamber 3G are provided by dividing the interior into front and rear parts by a. The second working pressure chamber 3b and the second negative pressure chamber 3C are for manual brakes in a separate system from the first working pressure chamber and the first negative pressure chamber, and the second working pressure chamber 3h is a large The atmospheric pressure inflow passage 5 communicates with the atmosphere via an air cleaner 6 provided at the end of the atmospheric pressure inflow passage 5, while the second negative pressure chamber 3G is connected to the negative pressure passage 7.
The pressure difference between the atmospheric pressure in the second working pressure chamber 3b and the negative pressure in the second negative pressure chamber 3C acts on the mask cylinder 4. It is configured to generate hydraulic pressure.

Further, the atmospheric pressure inflow passage 5 is provided with a variable throttle valve 1 as a passage restricting means for narrowing the passage area of the atmospheric pressure inflow passage 5.
0 is interposed, and the atmospheric pressure inflow passage 5 on the vacuum booster 3 side of the variable throttle valve 10 has a closed position 1.
A normally open brake operating solenoid valve 11 that can be switched between 1a and an open position 11b is provided. Further, the atmospheric pressure inflow passage 5 on the vacuum booster 3 side of the brake operating electromagnetic valve 11 is connected to the negative pressure passage 7 via the atmospheric pressure discharge passage 12, and the atmospheric pressure discharge passage 12 includes: Closed position 13a
A normally closed brake release solenoid valve 13 that can be switched between an open position 13b and an open position 13b is provided.

Therefore, by opening the brake actuation solenoid valve 11, atmospheric pressure flows from the atmospheric pressure inflow passage 5 into the second working pressure chamber 3b of the vacuum booster 3, and by opening the brake release solenoid valve 13, the vacuum booster The atmospheric pressure flowing into the second working pressure chamber 3b of No. 3 is discharged through the atmospheric pressure discharge path 12 and a part of the negative pressure path 7, and the second working pressure chamber 3b
A valve means 14 is configured to control the negative pressure chamber 3C to be in a negative pressure state equal to that of the second negative pressure chamber 3C.

In addition, reference numeral 16 indicates a dial for adjusting the response of the manual brake effectiveness as a manual adjustment means for manually adjusting the throttle of the atmospheric pressure inflow passage 5 by the variable throttle valve 10, and 17 indicates the brake activation solenoid valve 11 and the brake. Release solenoid valve 1
Both devices 16 and 17 are disposed around the driving position of the vehicle, and their output signals are sent to controllers 18 and 18. It has been entered. The controller 18 changes the degree of throttling of the variable throttle valve 10 according to the amount of manual operation of the responsiveness adjustment dial 16, and also controls the brake activation solenoid valve 11 when the driver closes the manual switch 17. Switching from the closed position 11a to the open position @11b allows atmospheric pressure to flow into the second operating pressure chamber 3b of the vacuum booster 3, while closing the brake operating solenoid valve 11 when the closing operation of the manual switch 17 is released. At the same time, the brake release solenoid valve 13 is returned to the open position 13a.
It switches from to the open position 13b to discharge the atmospheric pressure flowing into the second working pressure chamber 3b of the vacuum 1-star 3.

Therefore, in the embodiment described above, when the driver closes the manual switch 17 instead of depressing the brake pedal 1 when the vehicle needs to be decelerated, the brake activation Li magnetic valve 11 opens. vacuum booster 3
Atmospheric pressure flows into the second working pressure chamber 3b and the second negative pressure chamber 3c
A pressure difference is generated between the negative pressure of When the brake activation solenoid valve 11 is closed and the brake release solenoid valve 13 is opened, the second working pressure chamber 3b of the vacuum booster 3 is released.
Atmospheric pressure is discharged, and the pressure difference between the two negative pressure chambers 3c and the second negative pressure chamber 3c disappears, and the action of the brake force on the front and rear wheels is released. As a result, the vehicle is decelerated without requiring the driver to depress the brake pedal 1, thereby reducing the driver's operating effort.

Here, the amount of atmospheric pressure flowing into the second working pressure chamber 3b of the vacuum booster 3 per unit time when the manual switch 17 is closed is determined by the throttle of the atmospheric pressure inflow passage 5 by the variable throttle valve 10. Since the degree of aperture can be changed as appropriate by the driver's assisted operation of the responsiveness adjustment dial 16, the manual braking force can be set to various values according to the driving conditions of the vehicle and the driver's preference. This makes it possible to improve driving safety and maneuverability.

In the above embodiment, a second operating pressure chamber 3 for manual braking is provided in the vacuum booster 3 that is linked to the brake pedal 1.
b and the second angular pressure chamber 3c are provided, but in addition to the vacuum booster linked to the brake pedal 1, a vacuum booster for manual braking may be provided separately to generate manual braking force. Of course, the responsiveness adjustment dial 16 may be mechanically connected to the variable throttle valve 10 so that the degree of restriction of the atmospheric pressure inflow passage 5 can be changed as appropriate by the driver.

(Effects of the Invention) As explained above, according to the present invention, atmospheric pressure is caused to flow into the working pressure chamber of the vacuum booster based on a manual operation such as a manual switch, and manual braking force is applied to the front and rear wheels. In the self-help type brake v41f, the amount of atmospheric pressure flowing into the working pressure chamber of the vacuum booster per unit time can be changed as appropriate based on manual operation of a dial, etc. Various values can be set according to the situation and the driver's preference, and it is possible to reduce the operating effort of the driver and improve driving safety and maneuverability.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram showing an embodiment of the present invention. 3... Vacuum booster, 3b... Second working pressure chamber, 3C... Second negative pressure chamber, 5... Atmospheric pressure inflow passage, 7
. . . Negative pressure path, 8 . . . Negative pressure source, 10 . Means, 16... Responsiveness adjustment dial, 17... Manual switch.

Claims (1)

[Claims] (1) A braking device for an automobile equipped with a vacuum booster, wherein an atmospheric pressure inflow passage for causing atmospheric pressure to flow into an operating pressure chamber of the vacuum booster and a negative pressure chamber of the vacuum booster communicate with a negative pressure source. a connecting negative pressure path, a passage restricting means for narrowing the passage area of the atmospheric pressure inflow passage, and a valve means for controlling the inflow of atmospheric pressure into and discharge from the working pressure chamber of the vacuum booster through the atmospheric pressure inflow passage;
A braking device for an automobile, comprising: manual adjustment means for manually adjusting the degree of restriction of the atmospheric pressure inflow passage by the passage restriction means; and manual operation means for controlling the operation of the valve means.