JPH09164935A - Brake system of three-axle car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To devise a three-axle car equipped with an ABS/ASR and furnished with three system brake actuation control lines to hold the function of the ABS/ASR, to constantly secure the remaining two system brake actuation control lines even when the one system brake actuation control line is defective and to hold brakes of two axles or four wheels or more of six wheels in a state free to brake. SOLUTION: A device furnished with three system brake actuation control lines to respectively brake and control three axle wheels is furnished with a relay valve 5 with a dual relay valve or a double check valve on one of the three system brake actuation control lines by crossing brake actuation pressure pipings 10, 11 to be connected to wheel brakes 7b, 7c of left and right wheels of either one of a first axle R1 and a second axle R2 of two rear exles in the opposite direction against a brake actuation pressure piping of left and right wheels of the other axle. Thereafter, differential motion of an interaxle differential 20 is prohibited at the time of actuation of an ABS by setting the interaxle differential in a driving torque transmission system between the the two rear axles.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a three-axle vehicle equipped with ABS (Anti-Lock Brake System) / ASR (Anti-Slip Regulation System) while maintaining the ABS / ASR function. The present invention relates to a brake system for a three-axle vehicle in which the remaining two system brake operation control lines are secured even if the system brake operation control line fails.

[0002]

2. Description of the Related Art In a truck, a front one-axis steered wheel and two rear two-axis rear drive shafts are drive wheels, or both rear first and rear second drive shafts are drive wheels. There are three-axle vehicles in which the first and second front axles are steered wheels and the rear one axle is a drive wheel. So, the front one axis,
As an example of a three-system brake operation control line for controlling the braking of each of the three-axis wheels in the rear two-axis three-axis vehicle,
A first system connected to the wheel brakes of the left and right front 1-axis wheels, which are steered wheels, and a second system connected to the left wheel brakes of the rear 1-axis and rear 2nd axis, respectively.
There is a brake operating pressure piping configuration with a third system connected to the wheel brakes of the right rear wheels of the rear two rear axles and the rear second axle.

Also, in a three-axle vehicle with two front axles and one rear axle,
As an example of a brake operation control line of three systems for controlling the braking of each of the axle wheels, a first system connected to the wheel brakes of the left and right wheels of the front first axle, which is the steered wheel, and a front second wheel, which is the steered wheel, are provided. There is a brake operating pressure piping configuration including a second system connected to the wheel brakes of the left and right wheels of the shaft and a third system connected to the wheel brakes of the left and right wheels of the rear one shaft.

[0004]

In the case of the above-mentioned conventional brake working pressure piping structure, at least 3 when one system fails.
One or two wheels in the shaft can be braked at all times, and although a certain degree of braking effect can be secured, it is an issue to further improve the braking effect and secure safety. There is. In addition, in a three-axle vehicle equipped with ABS (anti-lock braking system) / ASR (anti-slip regulation system), for example, in a vehicle equipped with ABS, the rear wheels are split into left and right wheels, but
Since only one wheel side is braked when the system fails and affects the vehicle transition, etc., it is an issue to avoid the ABS / ASR dysfunction (lock or torque interference).

In view of the above problems, the object of the present invention is to
In addition to maintaining the BS / ASR function, even if one brake operation control line fails, the remaining two system brake operation control lines are always secured, and brakes for two or more than six wheels among the six wheels. Is to hold the brakeable state.

[0006]

SUMMARY OF THE INVENTION To achieve the above object, the gist of the present invention is a three-axle vehicle with front and rear axles equipped with ABS, each of which has three axle wheels. In a system provided with three systems of brake operation control lines for braking control, the brake operation pressure pipes connected to the wheel brakes of the left and right wheels of one of the rear two shafts are connected to the brake operation pressure lines of the left and right wheels of the other shaft. In the opposite direction, one of the three brake operation control lines is equipped with a dual relay valve or a relay valve with a double check valve, and the drive torque transmission system between the two rear axles has an interaxle differential. Is installed so that the differential of the inter-axle differential is prohibited when the ABS is operated.

Further, in a three-axle vehicle having a front one-axle and a rear two-axle equipped with an ABS and provided with three systems of brake operation control lines for controlling braking of each of the three-axle wheels, a rear two-axle One of the three systems of brake operation control lines is formed by crossing the brake operation pressure pipes connected to the wheel brakes of the left and right wheels of one of the shafts in the opposite direction to the brake operation pressure pipes of the left and right wheels of the other shaft. The brake operation control line is equipped with a dual relay valve or a relay valve with a double check valve, and ABS sensors are arranged on the four wheels of the left and right wheels of the front 1 axis and the left and right wheels of either the front or rear of the rear 2 axes. Select low control and select high control are controlled by a computer according to changes in vehicle speed so that select low control is performed at the initial stage of operation, and select high control is performed as the vehicle speed decreases. It is obtained so as to automatically convert.

Furthermore, in a three-axle vehicle with two front and one rear axles equipped with ABS, which is provided with three systems of brake operation control lines for controlling the braking of each of the three axle wheels, the rear first The brake operating pressure pipes connected to the wheel brakes of the left and right wheels of either one of the shafts or the front second shaft are crossed in the opposite direction to the brake operating pressure pipes of the left and right wheels of the other shaft, and the brakes of the three systems are provided. One brake operation control line of the operation control line is equipped with a dual relay valve or a relay valve with a double check valve.
A BS sensor is arranged so that the select low control is performed at the initial stage of ABS operation, and the select low control and the select high control are automatically converted by the computer according to the change of the vehicle speed so that the select high control is performed as the vehicle speed decreases. Is.

Further, in a three-axle vehicle having one front axle and two rear axles equipped with an ASR, which is provided with three systems of brake operation control lines for controlling the braking of each of the three axle wheels, the rear two axles One of the three systems of brake operation control lines is formed by crossing the brake operation pressure pipes connected to the wheel brakes of the left and right wheels of one of the shafts in the opposite direction to the brake operation pressure pipes of the left and right wheels of the other shaft. The brake operation control line is equipped with a dual relay valve or a relay valve with a double check valve, and the ASR control is interrupted during the ASR operation in the brake operation pressure pipes that are connected to the wheel brakes of the left and right wheels of either the front or rear of the rear two axes. It is equipped with a cut valve.

Further, in a three-axle vehicle having two front axles and one rear axle equipped with an ASR, which is provided with three systems of brake operation control lines for controlling braking of each of the three axle wheels, Brake piping connected to the wheel brakes of the left and right wheels of the shaft, and brake working pressure piping connected to the wheel brakes of the left and right wheels of the front and second axes and the left and right wheels of the rear one axis, and the brake working pressure piping of the left and right wheels of the other axis. In the opposite direction, the three brake operation control lines have one brake operation control line equipped with a dual relay valve or a relay valve with a double check valve, and are connected to the wheel brakes of the left and right wheels of the front second shaft. A cut valve that interrupts ASR control during ASR operation is installed in the brake operating pressure pipe.

Further, in a three-axle vehicle having one front axle and two rear axles equipped with an ASR, which is provided with three brake operation control lines for controlling the braking of each of the three axle wheels, the two rear axles are provided. One of the three systems of brake operation control lines is formed by crossing the brake operation pressure pipes connected to the wheel brakes of the left and right wheels of one of the shafts in the opposite direction to the brake operation pressure pipes of the left and right wheels of the other shaft. The brake operation control line is equipped with a dual relay valve or a relay valve with a double check valve, and freewheel hubs that disconnect the drive torque during ASR operation are installed on the left and right wheels of either the front or rear of the rear two axes.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. [Embodiment Corresponding to the Invention According to Claim 1] As shown in FIG. 1, a front first shaft (F) and a rear first shaft (R1) of the steered wheels,
A three-axle vehicle equipped with two rear axles (R2) and two ABS (antilock brake system),
The rear first shaft (R1) is a drive wheel or both the rear first shaft (R1) and the rear second shaft (R2) are drive wheels. 7a is a wheel brake for the left and right wheels of the front 1-axis (F), 7b is a wheel brake for the left and right wheels of the rear 1st axis (R1), and 7c
Is a wheel brake for the left and right wheels of the rear second axis (R2).

3 for controlling braking of each of the three-axis wheels
The brake operation control line of the system is a wheel brake for the left and right wheels of the front single axis (F) via the brake valve 3 connected to the first air tank 1 through the relay valve 4a and the brake booster 6a (pneumatic-hydraulic conversion booster). First signal line (first system) connected to 7a, brake valve 3 to relay valve 4b, and brake booster 6c.
A second signal line (second system) connected to the wheel brake 7b for the left rear wheel of the first rear axle (R1) via the (pneumatic-hydraulic conversion booster), the brake valve 3, and the second air tank 2. Dual relay valve 5 connected
(Or a relay valve with a double check valve) and a brake booster 6b (pneumatic-hydraulic conversion booster) to the third signal line (the third signal line) connected to the wheel brake 7b for the right wheel of the rear first shaft (R1). (3 systems) and the wheel brakes 7c for the left and right wheels of the second rear axle are connected to the second signal line (second system) and the third signal line (3rd system).

The brake operating pressure pipes connected to the wheel brakes of the left and right wheels of one of the rear two shafts are crossed in the opposite direction to the brake operating pressure pipes of the left and right wheels of the other shaft. . That is, the rear second axis (R2)
The left and right wheel brakes 7c have rear rear axles (R
The brake actuation pressure pipe 10 connected to the right wheel brake 7b of 1) is connected to the left wheel brake 7c of the rear second shaft (R2), and the left wheel brake 7b of the rear first shaft (R1) is connected. The brake actuation pressure pipe 11 connected to is connected to the wheel brake 7c for the right wheel of the rear second shaft (R2).

The above are the brake boosters 6a, 6b, 6c.
Although it is an air-over-hydraulic system using (pneumatic-hydraulic conversion booster), the brake chambers 8a, 8b, 8
The full air system (pneumatic brake) based on c can have the same configuration as described above.

Further, an inter-axle diff 20 is provided in the drive torque transmission system between the rear first shaft (R1) and the rear second shaft (R2) for inhibiting the differential (lockup) during ABS operation.

The mechanism of this interaxle differential 20 is shown in FIG.
As shown in, power is transmitted through the propeller shaft to the rear
Differential gear mechanism 2 of the interaxle differential 20 of the shaft (R1)
1, the rear first shaft (R1) is transmitted through the drive gear 22, and the rear second shaft (R2) is provided with a through shaft 24 having a sleeve 23 that is unlocked and locked by an air shift unit (not shown). And the propeller shaft 25. The air shift unit of the interaxle diff 20 prohibits the differential operation of the interaxle diff 20 during ABS operation.

In the above-mentioned structure, for example, when the signal lines have defective points D, E, F and G, the relationship between the sound braking wheel ◯ and the defective braking wheel × is as shown in FIG. For the point D, the left rear wheel of the first rear axle (R1) and the right wheel of the second rear axle (R2) are the failure braking wheels x, but the left and right wheels of the first front axle (F) are The total of four wheels including the right wheel of the rear first shaft (R1) and the left wheel of the rear second shaft (R2) are healthy braking wheels.

Similarly, for the failure point E, the left and right two wheels of the front single shaft (F) are the failure braking wheels X, but the rear first
A total of four wheels including the left and right wheels of the shaft (R1) and the left and right wheels of the second rear shaft (R2) are healthy braking wheels. For the failure point F, the left wheel of the rear first axis (R1) and the right wheel of the second rear axis (R2) are the failure braking wheels x, but the front one axis (F) Left and right wheels, and the right rear wheel of the first rear axle (R1) and the second rear axle (R2)
The left four wheels and the total four wheels are sound braking wheels. Further, for the failure point G, the two wheels, the right wheel of the rear first axis (R1) and the left wheel of the second rear axis (R2), are the failure braking wheels x,
The left and right wheels of the front single shaft (F), the left wheel of the rear first shaft (R1), and the right wheel of the second rear shaft (R2), a total of four wheels, are sound braking wheels.
It is.

In an ABS equipped vehicle having a braking function as described above, for example, the driver performs a braking operation while traveling on a split road where the road surface on the left wheel side is a low μ road and the road surface on the right wheel side is a high μ road. In this case, the ABS is activated when the wheel reaches the lock limit because the left wheel is on the low μ road side, and the brakes on the left wheel of the rear first axle (R1) and the right wheel of the second rear axle (R2) are ON at the ABS. / OFF. At the same time, the right wheel side has a high μ
ABS does not work because of the road, and the low μ of the rear second axis (R2)
The left wheel on the roadside does not operate ABS. Therefore, when the inter-axle diff 20 is not installed, there is a disadvantage that locking and dragging occur, but by installing the inter-axle diff 20, the following action is performed.

That is, since the left wheel side is a low μ road side, A
When the BS operates, the left wheel of the rear first shaft (R1) and the rear second shaft (R1)
AB where the brake for the right wheel in 2) is turned ON / OFF by ABS
At the same time as the S operation, the inter-axle diff 20 automatically prohibits differential (lock-up). And the rear first axis (R1)
The drive torque that has started to be recovered by the ABS operation of the left wheel is transmitted from the rear first shaft (R1) to the rear second shaft (R2) at a ratio of 1: 1 because of the locking of the interaxle differential 20. As a result, the driving torque is transmitted to the left wheel of the rear second shaft (R2),
The left wheel of the rear second shaft (R2) is less likely to be locked.

After the vehicle speed of the left wheel of the rear first axle (R1) has recovered, the ABS ends its operation and the interaxle differential 20
Is automatically released. In this way, the lock drag can be avoided without losing the function of the ABS during traveling on the split road to enable stable traveling.

[Embodiment Corresponding to the Invention of Claim 2] As shown in FIG. 4, the structure of FIG. 1 is such that between the rear first shaft (R1) and the rear second shaft (R2). The drive torque transmission system has the same configuration as that in which the interaxle diff 20 is not installed, and ABS sensors are provided on four wheels of the left and right wheels 7a of the front 1 axis (F) and the left and right wheels 7c of the rear second axis (R2). 30a to 30d are arranged, and select low control is performed at the initial stage of ABS operation, and a select low control and a select high control are automatically converted by a computer according to a change in vehicle speed so that select high control is performed as the vehicle speed decreases. It is a thing. The ABS sensor 3 for the rear axle
0c and 30d may be attached to the left and right wheels 7b of the rear first shaft (R1).

In this case, the signal line failure point D,
The braking function when E, F, and G are the same as that of the piping configuration of FIG. 1 shown in FIG.

[Embodiment Corresponding to the Invention of Claim 3] In FIG. 5, the front first shaft (F1) and the front second shaft of the steered wheels are shown.
It is a three-axle vehicle having a shaft (F2) and a rear single shaft (R1) of the drive wheels. Reference numeral 7a is a wheel brake for the left and right wheels of the front first shaft (F1), 7b is a wheel brake for the left and right wheels of the front second shaft (F2), and 7c is a wheel brake for the left and right wheels of the rear one shaft (R1). Is.

Braking control for each of the three axle wheels 3
The brake operation control line of the system includes a dual relay valve 5 (or a relay valve with a double check valve) connected to the second air tank 2 and controlled by the signal pressure from the brake valve 3 and a brake booster 6a (pneumatic-hydraulic conversion booster). ) Via a first signal line (first system) connected to the left and right wheel brakes 7a of the front first shaft (F1) and the brake valve 3 connected to the first air tank 1 to the relay valve. 4b and brake booster 6
b (pneumatic-hydraulic conversion booster) and front second shaft (F2)
The second signal line (second system) connected to the right wheel brake 7b, the brake valve 3 through the relay valve 4c, and the brake booster 6c (pneumatic-hydraulic conversion booster) to the second front shaft. It is a configuration of a third signal line (third system) connected to the left wheel brake 7b of (F2).

Then, the brake working pressure pipes connected to the wheel brakes of the left and right wheels of either the rear one shaft or the front second shaft are crossed in the opposite direction to the brake working pressure pipes of the left and right wheels of the other shaft. It was done. That is, in FIG. 5, the wheel brakes 7c for the left and right rear axles (R) are provided.
Is the wheel brake 7b for the right wheel of the second front axle (F2).
Is connected to the wheel brake 7c for the rear left single-axis (R) left wheel, which is connected to the front second
The brake operating pressure pipe 11 connected to the wheel brake 7b for the left wheel of the shaft (F2) is connected to the wheel brake 7c for the right wheel of the rear one shaft (R).

The ABS sensor 30 is attached to the four wheels of the left and right wheels 7a of the front first shaft (F1) and the left and right wheels 7c of the rear first shaft (R).
a to 30d are arranged so that the select low control is performed at the initial stage of the ABS operation, and the select low control and the select high control are automatically converted by the computer according to the change of the vehicle speed so that the select high control is performed as the vehicle speed decreases. It is a thing.

In the above FIG. 5, for example, when the signal line failure points D, E, F and G are set, the sound braking wheel ○
As shown in FIG. 12, the relationship between the failure braking wheel X and the failure braking wheel X is that the failure wheel D has two wheels, a front second axis (F2) right wheel and a rear one axis (R) left wheel. Although it is a broken braking wheel ×, a total of four wheels including the left and right wheels of the front first shaft (F1), the left wheel of the front second shaft (F2) and the right wheel of the rear first shaft (R) are healthy braking wheels ○. is there.

Similarly, for the failure point E, the left wheel of the front second shaft (F2) and the right wheel of the rear single shaft (R) are the failure braking wheels x, but the front first shaft is The left and right wheels of (F1), the right wheel of the second front shaft (F2), and the left wheel of the first rear shaft (R) are a total of four healthy braking wheels. In addition, for the failure point F,
The two wheels, the right wheel of the front second shaft (F2) and the left wheel of the rear one shaft (R), are the failure braking wheels x, but the left and right wheels of the front first shaft (F1),
A total of four wheels including the left wheel of the second front shaft (F2) and the right wheel of the first rear shaft (R) are healthy braking wheels. Further, for the failure point G, the left and right wheels of the front first shaft (F1) are the failure braking wheels x, but the left and right wheels of the front second shaft (F2) and the rear one axis ( The total of four wheels including the left and right wheels of R) are sound braking wheels.

Therefore, in the embodiments of FIGS. 4 and 5, for example, the driver performs a braking operation while traveling on a split road where the road surface on the left wheel side is a low μ road and the road surface on the right wheel side is a high μ road. In this case, the brake on the left wheel on the low μ road is turned on / off by ABS when the wheel reaches the lock limit. Also,
At the same time, the right wheel side of the second rear axle (R2) in FIG. 4 and the right wheel side of the first rear axle (R) in FIG. 5 are turned on / off by ABS.

The ABS control of the rear second axis (R2) in FIG. 4 and the rear one axis (R) in FIG. 5 is usually independent control, but in FIG. 4 the front one axis (F) and in FIG. Since the left and right wheels of the two shafts (F2) are independently braked, there is a problem that the steering wheel can be taken, but the present invention avoids this by the following action.

That is, the first ABS ON / OFF
At the time, that is, when the vehicle speed is high, the select low control is performed as shown in FIG. 7 to prevent the steering wheel from being taken off. Then, when the vehicle speed decreases, the ratio from select low to independent control is gradually and gradually converted to select high control (by computer software), and appropriate braking force is effectively used to stop without extending the stop distance. To do.

[Embodiment Corresponding to the Inventions of Claims 4 and 5] FIG. 8 (corresponding to claim 4) is a front 1 equipped with an ASR (anti-slip regulation system).
This is a three-axle vehicle with two axles and two rear axles, and the brake working pressure piping configuration and the braking function are substantially the same as in FIG. Further, FIG. 9 (corresponding to claim 4) is a three-axle vehicle with two front axles and one rear axle equipped with ASR (anti-slip regulation system), and the brake working pressure piping configuration and the braking function are shown in FIG. Is substantially the same as.

In FIG. 8, a cut valve 40 for interrupting the ASR control at the time of ASR operation is installed in the brake operating pressure pipe connected to the wheel brakes 7c for the left and right wheels of the rear second shaft (R2). In No. 9, the cut valve 40 for interrupting the ASR control at the time of ASR operation is installed in the brake operating pressure pipe connected to the wheel brakes 7b for the left and right wheels of the second front shaft (F2). The cut valve 40 is adapted to open and close a control valve 41 provided in a pipe connected to an air tank based on an ASR control signal.

As shown in FIG. 10, the structure of the cut valve 40 includes an input port 43 from the control valve 41, an input port 44 from the brake booster, and an output port 45 to the wheel brake in the valve body 42. The valve body 42 has a piston 46 which is operated by the air pressure introduced from the control valve 41 to the input port 43, and an output to the input port 44 and the wheel brake from the brake booster by the operation of the piston 46. A valve shaft 47 that opens and closes a passage with the port 45 and a return spring 48 of the valve shaft 47 are internally provided.

In the above structure, when the cut valve 40 is not provided, the ASR is activated when the drive wheel (the rear first shaft R1 in FIG. 8 and the rear one shaft R in FIG. 9) slips, and the one that is idling. Brake the wheels of. Simultaneously with this, in FIG. 8, which is not slipping, is connected to the wheel to which the brake working pressure pipe of the rear second shaft (R2) is connected, and in FIG. 9, it is connected to the brake working pressure pipe of the front second shaft (F2). Since the braking force is applied to the running wheels as well, the forward force is lost, and when the vehicle speed decreases and the vehicle is climbing uphill, inconvenience affecting uphill traveling occurs.

However, according to the present invention having the above-mentioned structure, the slip causes the ASR to operate and brakes the wheel that is idling, and at the same time, the cut valve 4
In FIG. 8, the brake working pressure pipe of the rear second shaft (R2) is connected, and in FIG. 9, the brake working pressure pipe of the front second shaft (F2) is not slipped. Break the brake circuit of the connected wheel.

As a result, the ASR operation can be performed only on the slipping wheels, the forward force can be maintained, and the influence of uphill traveling can be avoided when the vehicle is climbing uphill.

[Embodiment Corresponding to the Invention of Claim 6] FIG. 11 shows a three-axle vehicle having front Axle and rear Axle equipped with an ASR (Anti-Slip Regulation System). The piping configuration and the braking function are substantially the same as in FIG. In this FIG. 11, a free wheel hub 50 that disconnects the drive torque during ASR operation is installed on the left and right wheels 7c of the rear second shaft (R2).

As one example of the mechanism of the free wheel hub 50, as shown in FIG. 12, the axle shaft is divided into a differential side 51a and a hub side 51b, and splines 52a and 52b are provided on each of the splines 52a and 52b.
The sleeve 53 is slidably fitted to b.

As shown in FIG. 12, the sliding mechanism of the sleeve 53 includes a differential side 51 of the axle shaft.
spring 54 for connecting a to the hub side 51b
And as shown in FIG. 13, the differential side 51 of the axle shaft
Air cylinder 55 for separating a from the hub side 51b
In the air cylinder 55, a control valve 56 is arranged in a pipe connected to an air tank, and the control valve 56 is controlled by a signal of ASR (or ABS). Note that FIG. 12 shows a state where the differential side 51a and the hub side 51b of the axle shaft are connected, and FIG. 13 shows a state where they are separated.

In the above structure, when the free wheel hub 50 is not provided, the ASR is activated when the rear first shaft (R1) slips, and the wheel that is idling is braked. At the same time, the second axis (R
The brake will also be applied to the wheels to which the brake pressure piping in 2) is connected. As a result, the rear first axis (R
1) Since the driving torque is transmitted between the rear second shaft (R2), the brake ON and the driving torque are simultaneously actuated to cause torque interference, and the ASR non-actuated wheels of the driving wheels start to slip. Make a jerky movement.

However, according to the present invention having the above-described structure, the slip causes the ASR to operate and brakes the wheel that is idling, and at the same time, the free wheel hub 50 of the rear second shaft (R2) is automatically operated. 13, the sleeve 53 is shift-operated to disconnect the differential side 51a and the hub side 51b of the axle shaft from each other.

As a result, the transmission of the driving torque between the rear first shaft (R1) and the rear second shaft (R2) is cut off, so that torque interference does not occur and the ASR non-operating wheels of the drive wheels slip. The jerky operation such as the start of the operation is avoided, and as a result, the normal ASR control is performed.

[0046]

As described above, according to the present invention, AB
S (anti-lock braking system) / ASR (anti-slip regulation system) equipped with front 1-axle, 2-axle 3-axle car or 2-axle front, 3-axle rear
In an axle having three brake operation control lines for controlling the braking of each of the three axle wheels, even if one brake operation control line fails, the remaining two system brake operation controls The line is secured, and the brakes of two or more than four wheels among the six wheels can be held to improve the safety, and it is possible to avoid the functional failure due to ABS / ASR. .

[Brief description of the drawings]

FIG. 1 is a front 1-axis and rear 2-axis 3 equipped with the present invention.
Overall system diagram applied to axles

[Figure 2] Mechanism diagram of the interaxle differential

FIG. 3 is a diagram showing a relationship between a failed portion, a failed braking wheel, and a healthy braking wheel in the configuration of FIG.

FIG. 4 is a front 1-axis and rear 2-axis 3 equipped with the present invention.
Overall system diagram applied to axles

FIG. 5 is a front two-axle, one rear-axle equipped with ABS according to the present invention;
Overall system diagram applied to axles

FIG. 6 is a diagram showing a relationship between a failed portion, a failed braking wheel, and a healthy braking wheel in the configuration of FIG.

FIG. 7 is a graph showing the concept of select low control and select high control according to the configurations of FIGS. 4 and 5.

FIG. 8 is a front 1-axis and rear 2-axis 3 equipped with an ASR according to the present invention.
Overall system diagram applied to axles

FIG. 9 is a front two-axle and one rear-axle equipped with an ASR according to the present invention;
Overall system diagram applied to an axle

FIG. 10 is a sectional view of the cut valve.

FIG. 11 is an overall system diagram in which the present invention is applied to a three-axle vehicle with one front axle and two rear axles equipped with an ASR.

FIG. 12 Mechanical diagram of freewheel hub (connection state)

FIG. 13 is a mechanism diagram of a freewheel hub (disconnected state)

[Explanation of symbols]

 1 First Air Tank 2 Second Air Tank 3 Brake Valve 4a Relay Valve 4b Relay Valve 4c Relay Valve 5 Dual Relay Valve 6a Brake Booster 6b Brake Booster 6c Brake Booster 7a Wheel Brake 7b Wheel Brake 7c Wheel Brake 10 Brake Operating Pressure Piping Pipe 11 Brake Working pressure piping 20 Interaxle differential 30a ABS sensor 30b ABS sensor 30c ABS sensor 30d ABS sensor 40 Cut valve 50 Freewheel hub

Claims (6)

[Claims] 1. A three-axle vehicle having a front one-axle and a rear two-axle equipped with an ABS, in which braking control is performed on each of the three-axle wheels.
In the one equipped with the brake operation control line of the system,
The brake operating pressure pipes connected to the wheel brakes of the left and right wheels of either one of the rear two shafts are crossed in the opposite direction to the brake operating pressure pipes of the left and right wheels of the other shaft, and the brake operating control lines of the three systems are provided. One brake operation control line is equipped with a dual relay valve or a relay valve with a double check valve, and an interaxle diff is installed in the drive torque transmission system between the two rear axles. A braking system for three-axle vehicles, which is characterized by being prohibited. 2. A three-axle vehicle having a front one-axle and a rear two-axle equipped with an ABS, in which braking control is performed on each of the three-axle wheels.
In the one equipped with the brake operation control line of the system,
The brake operating pressure pipes connected to the wheel brakes of the left and right wheels of either one of the rear two shafts are crossed in the opposite direction to the brake operating pressure pipes of the left and right wheels of the other shaft, and the brake operating control lines of the three systems are provided. One brake operation control line is equipped with a dual relay valve or a relay valve with a double check valve, and ABS sensors are arranged on the four wheels of the left and right wheels of the front 1 axis and the left and right wheels of either the front and rear 2 axes. Then
A three-axis system characterized in that the selection low control is performed at the initial stage of the ABS operation, and the select low control and the select high control are automatically converted by a computer according to the change of the vehicle speed so that the select high control is performed as the vehicle speed decreases. Car braking system. 3. A three-axle vehicle with two front and one rear axles equipped with ABS, in which braking control is performed on each of the three axle wheels.
In the one equipped with the brake operation control line of the system,
The brake working pressure pipes connected to the wheel brakes of the left and right wheels of either the rear first shaft or the front second shaft are crossed in the reverse direction with respect to the brake working pressure pipes of the left and right wheels of the other shaft. One of the brake operation control lines of the system is equipped with a dual relay valve or a relay valve with a double check valve. ABS on the wheel
A sensor is arranged so that the select low control is performed at the initial stage of the ABS operation, and the select low control and the select high control are automatically converted by the computer according to the change of the vehicle speed so that the select high control is performed as the vehicle speed decreases. The characteristic three-axis vehicle braking system. 4. A three-axle vehicle having one front axle and two rear axles equipped with an ASR, in which braking control is performed on each of the three axle wheels.
In the one equipped with the brake operation control line of the system,
The brake operating pressure pipes connected to the wheel brakes of the left and right wheels of either one of the rear two shafts are crossed in the opposite direction to the brake operating pressure pipes of the left and right wheels of the other shaft, and the brake operating control lines of the three systems are provided. One brake operation control line is equipped with a dual relay valve or a relay valve with a double check valve, and ASR control is applied to the brake operation pressure pipes connected to the wheel brakes of the left and right wheels of either the front or rear of the rear two axes during ASR operation. A brake system for a three-axle vehicle that is equipped with a cut valve that interrupts the operation. 5. A three-axle vehicle having two front axles and one rear axle equipped with an ASR, wherein the braking control is performed on each of the three axle wheels.
In the one equipped with the brake operation control line of the system,
Brake pipes connected to the wheel brakes of the left and right wheels of the front first axis, and brake working pressure pipes connected to the wheel brakes of the left and right wheels of the front second shaft and the left and right wheels of the rear one axis are braked on the left and right wheels of the other axis. Crosses the working pressure pipe in the opposite direction,
One of the three brake operation control lines is equipped with a dual relay valve or a relay valve with a double check valve, and an ASR operation is applied to a brake operation pressure pipe connected to the wheel brakes of the left and right wheels of the second front shaft. A brake system for a three-axle vehicle that is equipped with a cut valve that sometimes interrupts ASR control. 6. A three-axle vehicle having one front axle and two rear axles equipped with an ASR, in which braking control is performed on each of the three axle wheels.
In the one equipped with the brake operation control line of the system,
The brake operating pressure pipes connected to the wheel brakes of the left and right wheels of either one of the rear two shafts are crossed in the opposite direction to the brake operating pressure pipes of the left and right wheels of the other shaft, and the brake operating control lines of the three systems are provided. It has a dual relay valve or a relay valve with a double check valve in one brake operation control line, and a freewheel hub that disconnects the drive torque during ASR operation is installed on the left and right wheels of either the front or rear of the rear two axes. The characteristic three-axis vehicle braking system.