JP2627631B2 - Automotive brake equipment - Google Patents

Description

The present invention relates to a brake device for an automobile. That is, the present invention relates to a brake device for an automobile that applies a braking force to wheels by sending air pressure or hydraulic pressure to a brake unit.

[Prior Art] FIG. 4 is a system diagram of an air pipe and the like, showing a main part of a brake device for an automobile according to a conventional example. FIG. 5 is a longitudinal sectional view of a main part of the conventional example.

In this type of brake device, a relay valve 5 interposed between the load source 1 and 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 carrier 1 and an axle 2 and detects a load. The brake part 6
The braking force on the wheels 7 is adjusted.

In this type of conventional brake device, only one load sensing valve 3 is provided, for example, on one of the left and right sides, and based on the load detected by such a load sensing valve 3, the relay valve 5 Since the opening and closing are performed by the corresponding amount, the braking forces on the wheels 7 of the left and right brake units 6 are the same on the left and right.

In the figure, 8 is an air tank, 9 is a brake pedal, 10
Is a brake chamber, 11 is a brake camshaft, 12 is a spring, 13 is a frame, 14 is a connecting rod, and 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 is inclined left and right in a curve, or when the load is not uniformly loaded on the loading platform 1 and is shifted left and right, the loads applied to the left and right wheels 7 are not the same. That is, the load applied to the left and right wheels 7 is
One is large and the other is small.

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

Therefore, for the wheel 7 on the side where a large load is applied,
While the braking force is insufficient and braking is difficult to apply, the braking force on the side of the wheel 7 on which a small load is applied is too strong and the braking is too heavy. As a result, first, a side slip or the like occurs, resulting in poor stability, and second, a braking distance is increased, and a risk of a slip, a collision accident or the like is increased.

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

The present invention has been made in view of such circumstances, and has been made to solve the problems of the above-described conventional example.Providing load sensing valves on both the left and right sides, the braking force according to the load is automatically set on the left and right sides. Added to the wheels individually,
The purpose is to propose an automobile braking device.

"Means for Solving the Problems" The technical means of the present invention for achieving this object is as follows.

In the brake device of this automobile, a relay valve interposed between the load source and a fluid source is opened and closed by a corresponding amount based on a fluid pressure signal from a load sensing valve interposed between a carrier and an axle to detect a load. The braking force on the wheels is adjusted.

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

The load sensing valves are provided on both left and right sides to face each other.

The relay valves are provided individually corresponding to the left and right load sensing valves, respectively.

The brake unit is composed of left and right brake units that apply individual braking forces to the left and right wheels based on the respective fluid pressures via the relay valves.

The left and right load sensing valves are attached to the left and right below the loading platform, respectively, and connected to the distal ends of connecting rods erected from the left and right sides of the axle, respectively, via levers whose base ends and distal ends are pivotally mounted, Each is pivoted.

The line from the fluid source is branched into a main line as a supply line and a branch line as a signal line. The main line is further branched into a right main line and a left main line, and the right main line is connected to the right brake section via the right relay valve, and the left main line is connected to the left main line. , Is connected to the left brake unit via the left relay valve.

The branch line is further branched into a right branch line and a left branch line after passing through a brake pedal. The right branch line is connected to the operating part of the right relay valve via the left load sensing valve, and the left branch line is connected to the left relay valve via the left load sensing valve. Is connected to the operating part of

[Operation] Since the automobile brake device according to the present invention includes such means, it operates as follows.

When the brake pedal is depressed, the fluid pressure from the fluid source passes through the brake pedal, and then reaches the left and right signal lines, the branch pipes, and the load sensing valve. The left and right load sensing valves detect the load applied to the left and right wheels via the left and right connecting rods and levers, respectively.
Accordingly, the fluid pressure signal corresponding to the detected load is
Each branch pipe is transmitted to the corresponding left and right relay valve operating section.

Thus, the left and right relay valves are respectively opened and closed by a corresponding amount based on the fluid pressure signal corresponding to the load from the left and right load sensing valves. Therefore, the fluid pressure from the fluid source is sent to the left and right brake units via the left and right main pipelines and relay valves serving as supply lines, and the magnitude of the fluid pressure sent to the brake unit in this way, and the brake unit The magnitude of the braking force according to corresponds to the opening / closing amount of the relay valve, that is, the load detected by the load sensing valve.

Since this is performed separately for the left and right sides, a braking force corresponding to the left and right loads is individually applied to the left and right wheels.

Therefore, when the loads applied to the left and right wheels are not the same, for example, when the vehicle body, that is, the cargo bed is tilted left and right on a curve, or when the load is not uniformly loaded on the cargo bed and is shifted left and right, the following occurs.

That is, in this case, as described above, a correspondingly large braking force is applied to the wheel with the larger load, and a correspondingly 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, the sideslip and the like are eliminated, and the braking distance is shortened.

In addition to these, connecting rods, levers, and load sensing valves are arranged on the left and right, and the pipe from the fluid source is branched into the left and right main pipes and the branch pipe, respectively. This is realized by a configuration in which a brake unit is connected via a valve, and an operation unit of a relay valve is connected to each of the left and right branch pipes via a load sensing valve. That is, the above-described points are easily realized by a simple configuration.

"Example" Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

First, the structure of the brake device will be described in the order of the outline of the brake device, its pipeline, and the like.

FIG. 1 is a system diagram of an air pipe and the like showing a main part of an embodiment of a vehicle brake device according to the present invention. FIG. 2 and FIG. 3 are longitudinal sectional views of a main part of the embodiment, and FIG.
The figure shows a case where the same load is applied to the left and right, and FIG. 3 shows a case where different loads are applied to the left and right.

 First, an outline of the brake device will be described.

In this vehicle brake device, load sensing valves 3 ₁ , 3 ₂ are interposed between a carrier 1 and an axle 2 to detect a load.
Based on the fluid pressure signal from, so that the relay valve 5 ₁ interposed between the fluid source of the compressor 4 or the like, 5 ₂ is opened and closed, the braking force is adjusted with respect to the wheel 7 of the brake portion 6 with .

The load sensing valve 3 _1, 3 ₂ are provided opposite to left and right sides. The relay valves 5 ₁ and 5 ₂ are individually provided corresponding to the left and right load sensing valves 3 ₁ and 3 ₂ , respectively. The brake unit 6
Based on the respective fluid pressure via a relay valve 5 _1, 5 _2, adding a separate braking force to the left and right wheels 7, which is from the left and right ones.

 The outline of the brake device is as follows.

 Next, the pipeline and the like will be described.

As shown in FIG. 1, a pipeline 16 from the compressor 4 as a fluid source is branched into a main pipeline 17 as a supply line and a branch pipeline 18 as a signal line after passing through an air tank 8.

The main line 17 serving as a supply line is further connected to the right main line 17.
₁ and the left is the branch into the main line 17 _2, main conduit 17 ₁ of the right is connected to the right brake chamber 10 via the right relay valve 5 _1, main lines 17 ₂ of the left the left relay valve 5 ₂ Is connected to the left brake chamber 10.

On the other hand, the branch line 18 serving as a signal line is connected to the brake pedal 9.
After through, it is further branched into right and branch pipe 18 ₁ left branch pipe 18 _2. The branch conduit 18 ₁ on the right, through the right of the load sensing valve 3 _1, the right relay valve
5 Connected to ₁ working part. Branch conduit 18 ₂ Matahidari is
Through the left of the load sensing valve 3 ₂ is connected to the hydraulic unit of the relay valve 5 ₂ of the left.

The brake pedal 9 opens and closes by pushing and releasing, and communicates and shuts off the branch pipeline 18.

The left and right load sensing valves 3 ₁ , 3 ₂ detect the load based on the swing of each lever 15, and transmit the corresponding pneumatic signal, which is a fluid pressure signal, through the branch pipes 18 ₁ , 18 _2. 5 _1, 5 to ₂ actuation portion, when those in which i.e. the detected load allowed to transfer is large, large becomes open the valve in proportion to the degree that the relay valve 5 large air pressure corresponding ₁ is transmitted as a signal to the actuating portion of the 5 _2, it will be increased pushing it with. When the reverse load detected in is small, the valve is opened less in proportion to the degree that a small air pressure corresponds is transmitted as a signal to the actuating section of the relay valve 5 _1, 5 _2, which have It will be pushed small.

The left and right relay valves 5 ₁ and 5 ₂ are actuated by corresponding amounts by the air pressure signals based on the brake pedal 9 and the load sensing valves 3 ₁ and 3 _2, and are opened and closed by the corresponding amount. become.

Brake chamber 10, 10, the air pressure corresponding to the opening and closing of the relay valve 5 _1, 5 ₂ to the cylinder chamber is fed via the main line 17 _1, 17 _2, the piston rod forward and backward by a stroke corresponding to the magnitude thereof It works.

 Pipes and the like are configured as described above.

 Next, the structure will be described.

As shown in FIGS. 2 and 3, left and right springs 12 are interposed between the left and right frames 13 suspended from the loading platform 1 and the axle 2 serving as an axle.
Suspended and held through. Also the frame 13, left and right of the load sensing valve 3 _1, 3 ₂ are attached. A base end of a lever 15 is pivotally connected to a distal end of a connecting rod 14 erected from the left and right sides of the axle 2, respectively.
Tip 15 is pivotally connected to the load sensing valve 3 _1, 3 _2, respectively.

Therefore, the amount of expansion and contraction of the left and right springs 12 is proportional to the load applied to the left and right wheels 7 from the bed 1 via the left and right sides of the axle 2,
The amount of swing of the lever 15 is proportional to the amount of expansion and contraction of the spring 12. Therefore, in load sensing valves 3 ₁ and 3 ₂ , lever 1
The load applied to the wheel 7 by the swing of 5 is detected.

One end of a brake camshaft 11 is connected to each of the piston rods of the brake chambers 10, 10, and the other end of the brake camshaft 11 is connected to the left and right brake units 6, respectively.

Therefore, the brake unit 6 is operated based on the operation of the brake chambers 10, 10 corresponding to the magnitude of the air pressure as the fluid pressure.
A corresponding braking force is applied to each wheel 7. That brake unit 6 has a braking force corresponding to the load detected by the load sensing valve 3 _1, 3 _2, as added to the wheel 7.

 The structure is like this.

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

 The operation and the like will be described below.

First, when the brake pedal 9 is released without being pushed, the following is performed.

That is, in this state in FIG. 1, in this state, the air pressure due to the pressurized air from the compressor 4 is branched from the line 16 into the main line 17 as a supply line and the branch line 18 as a signal line, and then closed. It is blocked by the relay valve 5 _1, 5 ₂ and the brake pedal 9. So brake part 6
Does not operate, and no braking force is applied to the wheels 7.

 Now, when the brake pedal 9 is pushed, it is as follows.

That is, in this case, in FIG. 1, the air pressure due to the pressurized air from the compressor 4 passes through the brake pedal 9 of the branch line 18 which is a signal line from the line 16 and then passes through the respective branch lines 18 ₁ and 18 _2. Load sensing valve 3
₁ , 3 and ₂ .

In the load sensing valves 3 ₁ and 3 ₂ , the load applied to the wheel 7 due to the swing of each lever 15 is detected, and the air pressure signal corresponding to the detected load is
By the respective branch conduit 18 _1, 18 _2, relay valve 5 _1, 5 ₂
, And pushes the corresponding operating portion by a corresponding amount.

So relay valve 5 _1, 5 ₂ is to be corresponding amounts opened and closed. Thus air pressure by pressurized air from the compressor 4, the main lines 17 _1, 17 ₂ of the serving supply line main line 17 and left and right, through a relay valve 5 _1, 5 _2, fed to the brake chamber 10, 10, the by a stroke corresponding to the magnitude i.e. relay valve 5 ₁ above, 5 ₂ of the opening and closing amount of air pressure that the piston rod is moving forward and backward.

Thus, the braking force is applied to the wheels 7 by the left and right brake units 6 via the respective brake camshafts 11.

 This is the case when the brake pedal 9 is pushed.

Now, the operation of the brake unit 6 is performed individually on the left and right sides thereof. Therefore, the braking force according to the left and right loads is applied to the left and right wheels 7.
Will be added individually.

Therefore, unlike the case of FIG. 2, for example, as shown in FIG.
When the load applied to the left and right wheels 7 is not the same, for example, when the vehicle body, that is, the loading platform 1 is tilted left and right, or when the load is not uniformly loaded on the loading platform 1 and is shifted to the left and right, the following occurs.

That is, in the case of FIG. 3, as described above, a large braking force corresponding to the large load is applied to the wheel 7 on the side where the load is large.
A correspondingly small braking force is applied to the wheel 7 on the side with the smaller load.

In this way, the individually adjusted appropriate brakes are automatically applied to the left and right, firstly, the sideslip of the automobile is eliminated, and secondly, the overall brake application is short and good. The car can be stopped at a distance, and the braking distance becomes shorter.

In addition, these have a connecting rod 14, a lever 15, and a load sensing valve 3 on the left and right, and a pipe 16 from the compressor 4 which is a fluid source is connected to the left and right main pipes 17 and a branch pipe.
18 and branches into left and right main pipelines 17 ₁ , 17
_2, connect the brake chamber 10 and the brake unit 6 via the relay valve 5 _1, 5 _2, the branch pipe 18 _1, 18 ₂ of the right and left,
Relay valve 5 ₁ via the load sensing valve 3 _1, 3 _2, 5 ₂
Are realized by a configuration in which the operating parts are connected. That is, the above-described points are easily realized by a simple configuration.

 The above is the description of the operation and the like.

In the above-described embodiment, air pressure is used as the fluid pressure, and the compressor 4 and the air tank 8 are used as the fluid source, and the whole is controlled by the air pressure. The invention is not limited to this. For example, hydraulic pressure may be used as the fluid pressure, and the whole may be controlled by hydraulic pressure.

[Effect of the Invention] As described above, the vehicle brake device according to the present invention is provided with the load sensing valves on both the left and right sides so that the 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, and firstly, the sideslip is eliminated and the stability is remarkably improved. Secondly, the braking distance is shortened, and the risk of slips and collision accidents is reduced and safety is reduced. Thirdly, these are easily realized by a simple structure, and the effects exhibited by this type of conventional example are remarkably large, such as eliminating the problems.

[Brief description of the drawings]

FIG. 1 is a system diagram of an air pipe and the like showing a main part of an embodiment of a vehicle brake device according to the present invention. 2 and 3 are longitudinal sectional views of main parts of the embodiment. FIG. 2 shows a case where the same load is applied to the left and right, and FIG. 3 shows a case where different loads are applied to the left and right. , Respectively. FIG. 4 is a system diagram of an air pipe and the like showing a main part of a brake device for a vehicle according to a conventional example. FIG. 5 is a longitudinal sectional view of a main part of the conventional example. 1 ... bed 2 ... axle 3 ₁ , 3 ₂ ... load sensing valve 4 ... compressor (fluid source) 5 ₁ , 5 ₂ ... relay valve 6 ... brake section 7 ... wheels 9 ... brake pedal 14 … Connecting rod 15… Lever 16… Line 17 ₁ , 17 ₂ … Main line 18 ₁ , 18 ₂ … Branch line

Claims (1)

(57) [Claims] 1. A relay valve interposed between a load source and a fluid source is opened / closed by a corresponding amount based on a fluid pressure signal from a load sensing valve interposed between a carrier and an axle to detect a load. A braking device for a vehicle, the braking force of which is adjusted, wherein the left and right load sensing valves provided on opposite sides of the vehicle and the individual relay valves provided respectively corresponding to the left and right load sensing valves. And, based on the respective fluid pressures via the relay valve, the left and right brake units that apply individual braking forces to the left and right wheels,
The left and right load sensing valves are mounted on the left and right under the loading platform, and the base end and the tip are pivotally attached to the distal ends of the connecting rods respectively erected from the left and right sides of the axle. And a line from the fluid source is branched into a main line as a supply line and a branch line as a signal line, and the main line is further connected to the right main line. And a main line on the left.The main line on the right is connected to the brake section on the right via the relay valve on the right, and the main line on the left is connected via the relay valve on the left to the left side. The branch line is connected to a brake unit, and the branch line is further branched into a right branch line and a left branch line after passing through a brake pedal, and the right branch line is connected to the right branch line. Connected to the operating part of the relay valve on the right via the load sensing valve , It left the branch pipe of, that is connected to the hydraulic part of the left of the relay valve through the left of the load sensing valve, motor vehicle braking system according to claim.