JPH01164657A - car brake equipment - Google Patents

Abstract

PURPOSE:To dissolve a sideslip or the like and improve the running stability by providing road sensing valves on both right and left sides and automatically applying braking forces corresponding to loads to the right and left wheels individually. CONSTITUTION:Load sensing valves 31 and 32 detecting loads are provided on both right and left sides between a rear body 1 and an axle 2, relay valves 51 and 52 provided between a fluid source such as a compressor 4 and brake sections of the right and left wheels are opened or closed based on the fluid pressure signals from the load sensing valves 31 and 32. The fluid pressure fed to brake chambers 10 at the brake sections of the right and left wheels is thereby controlled to adjust the braking forces of the right and left brake sections. Braking forces corresponding to the loads are automatically and individually applied to the right and left wheels, thus a sideslip or the like is dissolved, and the stability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a brake device for an automobile. That is, the present invention relates to a braking device for an automobile that applies braking force to wheels by sending pneumatic or hydraulic pressure to a brake unit.

``Prior art j'' Fig. 4 is a system diagram of air pipes, etc., showing the main parts of a conventional automobile brake system. Fig. 5 is a longitudinal sectional view of the main parts of the conventional example. be.

In this type of braking device, a relay valve 5 interposed between a fluid source such as a compressor 4 is opened and closed based on a fluid pressure signal from a load sensing valve 3 which is interposed between a loading platform 1 and an axle 2 and detects the load. , so that the braking force of the brake section 6 on the wheels 7 is adjusted.

In a conventional brake device of this type, only one load sensing valve 3 is provided, for example, on either the left or right side, and the relay valve 5 is activated based on the load detected by the load sensing valve 3. Since they are opened and closed by corresponding amounts, the braking force of the left and right brake sections 6 on the wheels 7 is the same on both sides.

In the figure, 8 is the air tank, 9 is the brake pedal, and 10 is the air tank.
is the brake chamber, 11 is the brake camshaft, 1
2 is a spring, 13 is a frame, 14 is a connecting rod,
15 is a lever.

[Problems to be Solved by the Invention] By the way, the following problems have been pointed out in such conventional automobile brake devices.

For example, when the vehicle body, that is, the loading platform 1, tilts to the left or right at a curve, or if the cargo is not evenly loaded on the loading platform 1 and is biased to the left or right, the loads applied to the left and right axles 7 are not the same. That is, the loads applied to the left and right wheels 7 are larger on one side and smaller on the other.

However, in the conventional brake device, as described above, the braking force of the brake section 6 on the wheels 7 is the same on the left and right wheels.

Therefore, the braking force is insufficient for the wheel 7 on the side to which a large load is applied, making it difficult to apply the brakes, but on the other hand, the braking force is too strong for the wheel 7 on the side to which a small load is applied, making it difficult to brake. It was becoming too much. As a result, firstly, sideslip and the like occur, resulting in poor stability, and secondly, braking distance becomes longer, increasing the risk of slipping and collisions.

In the conventional example, such a point was pointed out.

In view of these circumstances, the present invention has been made to solve the above-mentioned problems of the conventional example.Load sensing valves are provided on both the left and right sides, and the braking force according to the load is automatically applied to the left and right sides. The purpose of this invention is to propose a brake system for automobiles that can be applied individually to the wheels.

"Means for Solving the Problems J" The technical means of the present invention to achieve this objective are as follows.

In this automobile brake system, a relay valve interposed between a fluid source is opened and closed based on a fluid pressure signal from a load sensing valve that is interposed between the cargo platform and the axle and detects the load. The braking force is now adjustable.

The load sensing valve, relay valve, and brake section are as follows.

The load sensing valves are provided facing each other on both the left and right sides.

The relay valves are made up of individual relay valves provided corresponding to the left and right load sensing valves, respectively.

The brake section consists of left and right brake sections that apply individual braking forces to the left and right wheels based on respective fluid pressures via the relay valves.

"Function" Since the automobile brake device according to the present invention is comprised of such means, it functions as follows.

Based on a fluid pressure signal from the load sensing valve that corresponds to the load, the relay valve is opened or closed by a corresponding amount, and the brake section applies braking force to the wheels.

Since this is performed individually for both the left and right wheels, braking forces corresponding to the left and right loads are applied to the left and right wheels individually.

Therefore, if the load applied to the left and right wheels is not the same, for example, if the vehicle body or loading platform is tilted to the left or right at a curve, or if the cargo is not evenly loaded on the loading platform and is shifted to the left or right, etc., the following will occur.

In other words, in this case, as described above, a commensurately large braking force is applied to the wheel with the larger load, and a commensurately smaller braking force is applied to the wheel with the smaller load.

In this way, the individually adjusted appropriate brakes are automatically applied to the left and right sides, eliminating skidding and shortening the braking distance.

"Example" The present invention will be described in detail below based on the example shown in the drawings.

First, the configuration will be explained in the following order: the outline of the brake device, its ducts, etc., and its structure.

FIG. 1 is a system diagram of air pipes, etc., showing the main parts of an embodiment of an automobile brake system according to the present invention. Figures 2 and 3 are longitudinal cross-sectional views of the main parts of the same embodiment. Figure 2 shows the case where the same load is applied to the left and right sides, and Figure 3 shows the case where different loads are applied to the left and right sides. , respectively.

First, an overview of this brake device will be described.

In this automobile brake system, load sensing valves 33 and 3 are installed between the loading platform 1 and the axle 2 to detect the load.
Based on the fluid pressure signal from □, relay valves 58 and 5 □ interposed between the compressor 4 and other fluid sources are opened and closed, thereby adjusting the braking force of the brake unit 6 on the wheels 7. .

The load sensing valves 3I and 3□ are provided facing each other on both the left and right sides. The relay valve 51.5□ is the left and right load sensing valve 3. .

It consists of individual items provided corresponding to 3□. The brake unit 6 consists of left and right brake units that apply individual braking forces to the left and right wheels 7 based on respective fluid pressures via relay valves 5° and 52.

The outline of the brake device is as follows.

Next, we will discuss the pipes, etc.

As shown in FIG. 1, a conduit 16 from the compressor 4, which is a fluid source, passes through an air tank 8, and then branches into a main conduit 17, which is a supply line, and a branch conduit 18, which is a signal line.

The main pipe 17, which is the supply line, is further connected to the main pipe 1 on the right.
7. and the left main pipe 17□, and the right main pipe 17
．． is connected to the right brake chamber 10 via the right relay valve 5I, and the left main pipe 17□ is connected to the left brake chamber 10 via the left relay valve 5□.

On the other hand, the branch pipe 18 which is a signal line is connected to the brake pedal 9.
After passing through the right branch pipe L8+ and the left branch pipe 18
It is further branched into □. and right branch pipe 18.
is the right load sensing valve 3. Through the above right relay valve 5. connected to the operating part of the The literary branch line 182 is connected to the actuating portion of the left relay valve 5□ via the left load sensing valve 3□.

The brake pedal 9 communicates and blocks the branch pipe 18 by opening and closing by pushing and releasing the brake pedal 9.

The left and right load sensing valves 35, 3□ detect the load based on the swinging of the respective levers 15, and send a pneumatic signal, which is a corresponding fluid pressure signal, to the branch pipe 1B,
, 18□ are used to transmit the signal to the operating parts of the relay valves 5° and 5□.

In other words, when the detected load is large, the valve opens wide in proportion to the load, and a correspondingly large air pressure is transmitted as a signal to the actuating parts of the relay valves 5I and 5□, thereby pushing them greatly. It will move. Conversely, if the detected load is small, the valve opens a small amount in proportion to the load, and a corresponding small air pressure is transmitted as a signal to the actuating part of the relay valves 5° and 5□. It will require a small push.

The operating parts of the left and right relay valves 57, 5□ are pushed by a corresponding amount in response to the air pressure signal based on the brake pedal 9 and the load sensing valves 31, 3□, thereby opening and closing the corresponding amount. .

The brake chamber 10.10 has air pressure in its cylinder chamber corresponding to the opening and closing of the relay valve 57.5g in the main pipe 1.
71.17□, and the piston rod moves forward and backward with a stroke corresponding to its size.

The pipes etc. are like this.

Next, we will discuss its structure.

As shown in FIGS. 2 and 3, left and right springs 12 are interposed between the left and right frames 13 hanging from the loading platform 1 and the axle 2, so that the loading platform 1 is suspended via the frames 13. Retained. Further, left and right load sensing valves 38, 3□ are attached to the frame 13.

Further, the proximal ends of levers 15 are pivotally attached to the tips of connecting rods 14 erected from the left and right sides of the axle 2, respectively, and the tips of the levers 15 are connected to load sensing valves 3. ．． 3
It is pivoted to 2.

Therefore, the amount of extension wi of the left and right springs 12 is proportional to the load applied from the loading platform 1 to the left and right wheels 7 via the left and right sides of the axle 2, and the amount of swing of the lever 15 is proportional to the amount of expansion and contraction of the spring 12. Therefore, in the load sensing hub 38, 3□, the load applied to the wheel 7 due to the swinging of the lever 15 is detected.
One end of a brake camshaft 11 is connected to each piston rod of 0, and this brake camshaft 1
1 are connected to left and right brake sections 6, respectively.

Therefore, the brake section 6 is configured to apply a corresponding braking force to each wheel 7 based on the operation of the brake chambers 10 and 10 corresponding to the magnitude of the air pressure, which is the fluid pressure described above. That is, the brake section 6 applies a braking force to the wheel 7 according to the load detected by the load sensing valves 30, 3□.

Its structure is as follows.

The automobile brake system according to the present invention is as described above.

The operation etc. will be explained below.

First, when the brake pedal 9 is not pressed but released, the following is true.

In other words, in this state in Fig. 1, the compressor 4
The air pressure from the pressurized air is branched from the pipe line 16 into a main pipe line 17 as a supply line and a branch pipe line 18 as a signal line, and then the relay valves 5I and 5 are closed.
It is cut off by □ and the brake pedal 9. Therefore, the brake section 6 does not operate, and no braking force is applied to the wheels 7.

Now, when the brake pedal 9 is pressed, the following occurs.

That is, in this case in FIG.
The air pressure from the pressurized air from the pipe 16 passes through the brake pedal 9 of the branch pipe 18, which is a signal line, and then reaches the load sensing valves 31, 3□ through the respective branch pipes 181, 182.

The load sensing valves 38 and 3□ detect the load applied to the wheel 7 by the swinging of the respective levers 15, so that the air pressure signal corresponding to the detected load is transmitted to each branch pipe 180, 18□. This is transmitted to the actuating parts of the relay valves 5I and 5□, and pushes the actuating parts by a corresponding amount.

Therefore, the relay valves 5I and 5□ are opened and closed by corresponding amounts. Therefore, the air pressure due to the pressurized air from the compressor 4 is applied to the main pipe line 17, which is the supply line, and the main pipe lines 17 on the left and right sides of the main pipe line 17. ．． 17□, relay valve 5I, 5□
The air is sent to the brake chamber 10.10 through the air pressure, and the piston rod moves forward and backward with a stroke corresponding to the magnitude of the air pressure, that is, the amount of opening and closing of the above-mentioned relay valves 5+ and 5z.

As a result, braking force is applied to the wheels 7 by the left and right brake sections 6 via the respective brake camshafts 11.

This is what happens when the brake pedal 9 is pressed.

Now, here, such an operation of the brake section 6 is as follows.
This is done separately for both the left and right sides. Therefore, braking force corresponding to the left and right loads is applied to the left and right wheels 7 individually.

Therefore, for example, unlike the case shown in Fig. 2, as shown in Fig. 3, if the vehicle body, that is, the loading platform 1 leans to the left or right at a curve, or if the cargo is not loaded evenly on the loading platform 1 and is biased to the left or right, etc.
If the loads applied to the left and right wheels 7 are not the same, the following will occur.

In other words, in the case of FIG. 3, as described above, a commensurately large braking force is applied to the wheel 7 on the side with the greater load, and a commensurately smaller braking force is applied to the wheel 7 on the side with the lesser load. It turns out.

In this way, the appropriate individually adjusted brakes are automatically applied to the left and right sides, and firstly, the skidding of the car is eliminated, and secondly, the overall brake application is good and short. The car can stop within a short distance, and the braking distance is also shortened.

The above is the explanation of the operation, etc.

In the embodiments described above, air pressure is used as the fluid pressure, and the compressor 4 and the air tank 8 are used as fluid sources, and the entire system is controlled by air pressure. However, the present invention is of course not limited to this. The present invention is not limited to this, and for example, hydraulic pressure may be used as the fluid pressure, and the entire system may be controlled by hydraulic pressure.

"Effects of the Invention" As explained above, the automobile brake system according to the present invention is provided with load sensing valves on both the left and right sides, so that braking force according to the load is automatically applied to the left and right wheels individually. As a result, appropriate brakes are applied to the left and right sides, which eliminates skidding and significantly improves stability.The braking distance is also short (lower risk of slipping, collisions, etc.), which improves safety. The results are remarkable, and the problems that existed in conventional examples of this type have been completely eliminated.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of air pipes, etc., showing the main parts of an embodiment of an automobile brake system according to the present invention. Figures 2 and 3 are longitudinal cross-sectional views of the main parts of the same embodiment. Figure 2 shows the case where the same load is applied to the left and right sides, and Figure 3 shows the case where different loads are applied to the left and right sides. , respectively. FIG. 4 is a system diagram of air pipes, etc., showing the main parts of a conventional automobile brake system. FIG. 5 is a vertical sectional view of the main part of the conventional example. ■...Loading platform 2...Axle 38, 3□...Load sensing valve 4...Compressor (fluid source) 54,5□...Relay valve 6...Brake part 7...Wheel number Figure 1 Figure 4 Figure 2 Figure 3

Claims (1)

[Claims] Based on a fluid pressure signal from a load sensing valve that is installed between the cargo platform and the axle and detects the load, a relay valve that is interposed between the fluid source and the fluid source is opened and closed, thereby controlling the brake unit's wheels. A braking device for an automobile in which power is adjusted, comprising left and right load sensing valves provided facing each other on both sides, and individual relay valves provided corresponding to the left and right load sensing valves, respectively. A braking device for an automobile, comprising: the left and right brake sections that apply individual braking forces to the left and right wheels based on respective fluid pressures via the relay valves.