JPH05572U - Anti-lock brake device - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To improve the braking efficiency of the anti-lock brake system by optimizing the distribution of hydraulic pressure for the front and rear brakes. [Structure] Antilock devices are respectively arranged between the front and rear wheel brakes 14A and 14B on both the left and right sides and the rear wheel brakes 15A and 15B on both the left and right sides and the master cylinder 11.
Antilock device 16A for rear wheel brakes on both left and right
Proportioning valves 18A and 18B are disposed between D and the master cylinder to proportionally reduce the output hydraulic pressure with respect to the input hydraulic pressure according to the pressure detected by the pressure detection hole. The pressure detection hole of the proportioning valve is connected between the front wheel brake on the same side and the antilock device for the front wheel brake.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to an anti-lock brake device, and more particularly to a front wheel and a rear wheel brake. The hydraulic pressure distribution is optimized to improve the braking efficiency.

[0002]

[Prior art]

  Conventionally, the output hydraulic pressure is compared to the input hydraulic pressure according to the pressure detected by the pressure detection hole. Example A valve equipped with a proportioning valve for reducing pressure (hereinafter abbreviated as P valve) A lock lock brake device is provided.

[0003]   The P valve prevents the rear wheels from locking before the front wheels and impairs the stability of the vehicle body. In order to stop it, set the distribution of the hydraulic pressure of the rear wheel brake and the hydraulic pressure of the front wheel brake appropriately. Function. Therefore, the anti-lock device (hereinafter referred to as ABS device) I will omit it. ), The P valve is unnecessary.

[0004]   However, due to the unbalance of the braking force of the front and rear wheels, the friction coefficient μ of the road surface is reduced. Compared with the above, it is possible to prevent the ABS device from operating earlier and causing discomfort such as noise and vibration. Anti-lock brake device in consideration of stopping or ABS device failure Even though, the P valve is provided.

[0005]   FIG. 7 is an example of an antilock brake device including the P valve as described above. It   The anti-lock brake device is an X pipe and has front and rear brakes 1A on both left and right sides. 1B and rear wheel brakes 2A and 2B are anti-lock devices (ABS devices), respectively. 3A, 3B, 3C, 3D, rear wheel brakes 2A, 2B and master cylinder 5 P valves 4A and 4B are arranged between them.

[0006]   The P valves 4A and 4B have pressure detection holes 6a and 6b, respectively, of the other hydraulic system. It is connected to the outlet side of the master cylinder 5, and the rear wheels do not lock before the front wheels. The outlet side pressure of the master cylinder 2 detected by the pressure detection holes 6a and 6b. The hydraulic pressure of the rear wheel brakes 2A, 2B against the hydraulic pressure of the front wheel brakes 1A, 1B. And proportionally reduce the pressure, and if a failure occurs, the P valve 2A of the other hydraulic system 2B, the proportional pressure reduction is released to increase the hydraulic pressure of the rear wheel brakes 2A, 2B. are doing.

[0007]   With the anti-lock braking device as described above, generally, except the driver, Since the rear wheels are most likely to lock when nothing is mounted on both cars (when the car is empty) , According to this, set the distribution of the hydraulic pressure of the front and rear wheel brakes to distribute the braking force. ing.

[0008]   However, ideal front wheels with luggage and other personnel (when loaded) Also, the distribution of hydraulic pressure for the rear wheel brakes is larger on the rear wheel side compared to when the vehicle is empty. Therefore, when distributing the brake fluid pressure of the front and rear wheels by the P valve, May be distributed unreasonably low with respect to the ideal braking force.

[0009]   On the other hand, a ball that detects deceleration and rolls is used, and the Start proportional pressure reduction of the rear wheel brakes with low hydraulic pressure (low bending hydraulic pressure), Start proportional pressure reduction of the rear wheel brakes with a higher hydraulic pressure (higher breaking hydraulic pressure), and even a little Deceleration-sensitive ratio that tries to approach the ideal distribution of front and rear wheel brake fluid pressure Example: The load hydraulic pressure is detected from the displacement of the control valve or the suspension displacement of the vehicle body, There is known a vehicle height reaction type proportional control valve that adjusts.

[0010]   However, in the former case, the ball rolls earlier due to the fluid flow around the ball. On the other hand, in the latter case, the rear wheel suspension is affected by the nose dive. Can be a little confusing, so using these proportional control valves The braking force on the rear wheels will be much less than the originally required braking force. There is also.

[0011]   Compared to the ideal distribution of braking force for the front and rear wheels as described above, A vehicle body that can be achieved if the rake force is small and if the ideal distribution is originally made. Before obtaining deceleration, the resulting overloaded front wheels are locked and the ABS device Works. From this state, further depress the brake pedal to open the master cylinder. It is possible to gradually increase the rear wheel brake pressure if activated, but in general, The operation of the ABS device is understood to be a warning against excessive braking Therefore, the driver often does not step further.

[0012]   That is, since the rear wheel brake fluid pressure is suppressed by the P valve, Control is performed only on the front wheel brakes, and the rear wheel brakes lack braking force. As a result, the braking force of the vehicle as a whole was insufficient, and it was rejected despite having the ABS device. Therefore, the braking distance increases.

[0013]   On the other hand, as disclosed in Japanese Utility Model Publication No. 1-90660, the master -Provide a P valve between the cylinder and the actuator that performs antilock operation Along with a bypass equipped with an electromagnetic on-off valve between the master cylinder and actuator A configuration having a line has been proposed.

[0014]   With the above configuration, when the actuator is operating normally, the electromagnetic While the on-off valve is open and the P-valve is not operated, the actuator If an abnormality occurs in the operation, close the above-mentioned solenoid on-off valve and keep it in the bypass line. Is closed to activate the P valve.

[0015]   According to this structure, the rear wheel brake is provided by providing the P valve as described above. It is possible to eliminate the lack of hydraulic pressure.

[0016]

[Problems to be solved by the device]

  However, in the case of the above configuration, the bypass line and the solenoid on-off valve Since it has to be provided, the structure becomes complicated and the cost increases.   Even if the actuator is operating normally, do not use the P valve. Since pressure is directly applied to the actuator from the master cylinder, Looking at the μ level or G level, the rear wheels tend to lock early, Therefore, the anti-lock operation often occurs on the rear wheels, which is troublesome.

[0017]   The present invention solves the above problems in the conventional anti-lock brake device. This is done for the purpose of anti-lock braking device, front wheel and rear The distribution of wheel brake fluid pressure should always be in an appropriate state to improve braking efficiency. It is intended for and.

[0018]

[Means for Solving the Problems]

  Therefore, the present invention is based on the left and right front wheel brakes and the left and right rear wheel brakes. Place the anti-lock device between the star cylinder and Pressure detection between anti-lock device for wheel brake and master cylinder Proposal to reduce the output fluid pressure proportionally to the input fluid pressure according to the pressure detected by the hole Position the positioning valve and place the pressure detection hole of the proportioning valve in front of the same side. An anti-lock connected between the wheel brake and the anti-lock device for the front wheel brake A lock brake device is provided.

[0019]   Specifically, in the above antilock brake device, the left front wheel brake and the right rear wheel are Connect the hydraulic system that connects the brakes to the right front wheel brake and the left rear wheel brake. As the X pipes connecting the hydraulic system with the master cylinder, The proportioning valve is equipped with a pressure detection hole for the proportioning valve. Front wheel brake with a different hydraulic system from the other hydraulic system and anti-lock for the front wheel brake It is connected to the device.

[0020]   Alternatively, the hydraulic system that connects the front wheel brakes on the left and right sides and the rear wheel brakes on the left and right sides The hydraulic system connected to the rake may be connected to the master cylinder, respectively.

[0021]

[Action]

  The anti-lock brake device according to the present invention is configured as described above. Therefore, until the front wheel brakes start antilock control, the proportioning The hydraulic pressure of the rear wheel brake by the cylinder, that is, the front wheel brake. The pressure is reduced proportionally to the liquid pressure of. When the front wheel brakes start anti-lock control, The proportioning valve detects this from the pressure detection hole, and the rear wheel blur is detected. Release the proportional reduction in hydraulic pressure. Therefore, the driver steps on the brake pedal. Even if you do not operate the master cylinder in a complicated manner, the hydraulic pressure of the rear wheel brake is The pressure is increased toward the hydraulic pressure of the cylinder, and the distribution of the hydraulic pressure of the front and rear wheel brakes is ideal. Close to normal allocation.

[0022]   The proportioning valve also detects pressure in the event of a hydraulic system failure. Detecting this from the exit hole, the proportional reduction of the rear wheel brake fluid pressure is released, and the failure occurs. It is possible to compensate for the decrease in braking efficiency.

[0023]

【Example】

  Next, the present invention will be described in detail based on the embodiments shown in the drawings.   The first embodiment of the present invention shown in FIG. 1 is an anti-lock brake device for an FF vehicle. Then, the first and second hydraulic systems 12 and 13 are provided from the master cylinder 11, and X It has piping. That is, the first hydraulic system 12 has the left front wheel brake 14A and the right front wheel brake 14A. The second hydraulic system 13 is connected to the rear wheel brake 15B and the second hydraulic system 13 is on the right front wheel brake. 14A and the left rear wheel brake 15A.

[0024]   The front wheel brakes 14A and 14B and the rear wheel brakes 15A and 15B are respectively Anti-lock device (ABS device) 16A, 16B between master cylinder 11 , 16C, 16D.

[0025]   In addition, the ABS devices 16C and 16D of the left and right rear wheel brakes 15A and 15B are Proportioning valves (P valves) are provided between the master cylinders 11. 18A and 18B are arranged.   The P valves 18A and 18B have a structure as shown in FIG. Is connected to the master cylinder 11 side, the outlet hole 22 is connected to the rear wheel brake 14A, It is connected to the ABS devices 16C and 16D of 14B. In addition, the pressure detection hole 24, Reference numeral 24 designates the front wheel brakes 14A, 14B of the other hydraulic system 12, 13 and the front wheel brakes. It communicates with the ABS devices 16A and 16B for the brakes 14A and 14B.

[0026]   The housing 25 of the P valves 18A and 18B has first to fifth holes from the bottom in the drawing. The portions 26, 27, 28, 29, 30 are continuously provided in the axial direction, and the inlet is provided. The hole 21 and the outlet hole 22 are connected to the first hole portion 26 and the second hole portion 27, respectively. It is provided so as to penetrate in the radial direction.

[0027]   The opening 26a of the first hole 26 at the lower end of the housing 25 in the figure is provided with the lower guide hole 32. It is sealed with a plug 32 provided with a.   On the other hand, the opening 30a of the fifth hole 30 at the upper end of the housing 25 is provided with a plug described later. The plunger hole 34 that slidably projects from the upper portion 36f of the plunger 36 and the pressure described above. The force detection hole 24 is sealed by an end plug 35 provided continuously in the axial direction.   Further, the plunger hole 34 is formed on both sides of the pressure detection hole 24 so as to penetrate therethrough in the radial direction. The provided connection holes 60 and 61 are penetrated.

[0028]   The plunger 36 has a lower portion 36b provided with a hollow portion 36a and the lower guide hole It is slidably inserted in 32a. A cup seal 38 is attached to the top of the plug 32. The outer peripheral portion 36c of the plunger 36 constitutes the first effective area A. Well In addition, the cup seal 38 is provided between the hollow portion 36a and the lower guide hole 32a. The air is sealed, and the air is compressed by the vertical movement of the plunger 36. ing.

[0029]   On the flange portion 36c continuously provided on the lower portion 36b and the cup seal 38 A spring 41 is contracted between the retainer 40 and the retainer 40, which are disposed on one side. 36 is elastically biased upward in the drawing.

[0030]   Above the flange portion 36c, a neck portion 36d having a small diameter and a diameter larger than the neck portion 36d are provided. The valve head portion 36e is provided.   The neck portion 36d has a hole portion of a substantially annular seal valve 42 as shown in FIG. 42a is fitted on the outside.

[0031]   The seal valve 42 is provided with a lip portion 42b on the outer peripheral portion, and The flow of hydraulic fluid between the peripheral surface and the outer peripheral surface of the seal valve 42 is blocked.   Further, a plurality of hemispherical protrusions 42d are provided on the lower surface 42c of the seal valve 42. The protrusion 42d is disposed on the upper surface of the flange portion 36c, and the neck portion The outer diameter of 36d is set larger than the inner diameter of the hole 42a so that a space is formed between them. Therefore, as shown in FIG. 1, the plunger 36 is moved upward by the urging force of the spring 41. Is operated when the valve head 36e and the seal valve 42 are separated from each other. The liquid can pass through the seal valve 42.

[0032]   On the other hand, the outer diameter of the valve head portion 36e provided above the neck portion 36d is equal to that of the hole portion. 42a, and the valve head portion 36e is set to a seal valve 42a. Contact with the valve head, the flow of hydraulic fluid passing through the seal valve 42 is blocked and the valve head is closed. The area surrounded by the joining line between the portion 36e and the hole 42 constitutes the effective area B.

[0033]   The upper portion 36f, which is provided continuously to the valve head portion 36e, has a small diameter third hole portion. Is slidably supported by the end plate 28 and is also supported through the fourth hole 29. The protrusion 35 projects into the plunger hole 34. Tip of end plug 35 and fifth hole A seal is provided between the shoulder portion 43 formed by the portion 30 and the fourth hole portion 29 with a washer 44. The O-ring portion 45a of the member 45 is sandwiched. The sealing member 45 has a central hole 45b. The outer periphery of the upper portion 36f of the plunger 36 that penetrates through the upper and lower sides of the O-ring portion 45a. Sealing is provided by annular sealing flanges 45c and 45d provided on both sides. Therefore, the upper portion 36f of the plunger 36 forms the third effective area C.   In this embodiment, the connection holes 60 and 61 are not connected to any hydraulic system and are closed. There is. In addition, the inlet hole 21, the outlet hole 22 and the pressure detection hole 24 are respectively A pipe member (for arranging the seat 48 to form the first and second hydraulic systems 12 and 13 ( (Not shown) can be surely connected.

[0034]   The above-mentioned P valves 18A and 18B have operational characteristics as shown in FIG.   In the figure, S1 indicates the ideal hydraulic pressure distribution when the vehicle is loaded, and S2 indicates the ideal hydraulic pressure distribution when the vehicle is empty. The distribution of hydraulic pressure is shown.

[0035]   First, the ABS devices 16A, 16B of the front wheel brakes 14A, 14B do not operate, In addition, in the state where no failure has occurred in the first and second hydraulic systems 12 and 13 (normal time), , The input hydraulic pressure PM from the master cylinder 11 reaches a predetermined value (breakpoint hydraulic pressure PM1) Until the input hydraulic pressure PM and the output hydraulic pressure PR for the rear wheel brakes 15A and 15B Are equal.

[0036]   However, when the break point hydraulic pressure PM1 is reached, the hydraulic pressure detected by the pressure detection hole 24 is detected. In accordance with the above, the input hydraulic pressure PM is proportionally reduced to the rear wheel brakes 15A and 15B. And supply it as the output hydraulic pressure PR. On the other hand, the front wheel brakes 14A and 14B are directly connected to The contact input hydraulic pressure PM is supplied, and the hydraulic pressure of the master cylinder 11 and the front wheel brake 1 The hydraulic pressures of 4A and 14B are equal. Therefore, the hydraulic pressure is distributed to the front wheel brake 14A, Tilt to 14B side.

[0037]   In this case, the input hydraulic pressure (break point hydraulic pressure PM1) for starting the proportional pressure reduction is equal to that of the spring 41. If the urging force is F,   PM1 = F / A Is.   In addition, the pressure reduction ratio of the proportional pressure reduction is   tan θ1 = (B−A−C) / (B−C) Becomes

[0038]   When the anti-lock function is activated, or when the hydraulic system fails, the pressure detection hole Even if 24 detects a decrease in hydraulic pressure and reaches the above-mentioned break point hydraulic pressure PM1, proportional pressure reduction is not performed. If the proportional pressure reduction is being performed, the proportional pressure reduction is released, and the rear wheel brakes 15A and 15B are released. And the front wheel brakes 14A and 14B are increased in a state in which the distribution of hydraulic pressure is equal.

[0039]   In this case, the break point hydraulic pressure PM2 is   PM2 = F / (AC) Is.   In addition, the pressure reduction ratio of the proportional pressure reduction is   tan θ2 = (B−A) / (B−C) Is.   Therefore, regarding the breaking point hydraulic pressure,   F / A << F / (AC)   Therefore,   PM1 << PM2 On the other hand, for the pressure reduction ratio of the proportional pressure reduction,   (B-A-C) / (B-C) <(B-A) / (B-C) Is.

[0040]   That is, when the P valves 18A and 18B are normally operated, the break point hydraulic pressure PM1 is low, Moreover, while the pressure reduction ratio is small, the ABS system on the front wheel side is activated or the hydraulic system is damaged. If it occurs, the breaking point hydraulic pressure PM2 is high and the pressure reduction ratio is also large.

[0041]   Next, the operation of the first embodiment having the above configuration will be described.   In the following description, it is assumed that the vehicle is loaded with luggage, personnel, etc. (when loaded). To do.   When the brake pedal 50 is depressed, the hydraulic pressure in the master cylinder 11 is hydraulic system. Through 12 and 13 to the front and rear wheel brakes 14A, 14B, 15A and 15B Supplied.

[0042]   At this time, the input hydraulic pressure PM from the master cylinder 11 reaches the above-mentioned break point hydraulic pressure PM1. Until the front wheel brakes 14A, 14B and the rear wheel brakes 15A, 15B are equalized. Yes.   When the input hydraulic pressure PM reaches the above-mentioned break point hydraulic pressure PM1, the P valves 18A and 18B are connected to each other. 2 is pushed down by the hydraulic pressure from the pressure detection hole 24 in FIG. Depressurize. That is, the hydraulic pressure of the rear wheel brakes 16A and 16B is suppressed, and the rear wheel brakes are The hydraulic pressure of 16A and 16B should be lower than that of the front wheel brakes 14A and 14B. Distribute brake fluid pressure to.

[0043]   The pressure reduction ratio at this time is, as described above,   tan θ1 = (B−A−C) / (B−C) Is.

[0044]   In the state where the proportional pressure reduction is performed as described above, A of the front wheel brakes 14A, 14B The brake fluid pressure of the front wheel brakes 14A, 14B is activated by the operation of the BS devices 16A, 16B. When the pressure is reduced, between the front wheel brakes 14A, 14B and the ABS devices 16A, 16B The P valve 18 of the other hydraulic system 12, 13 connecting the pressure detection holes 24, 24 A and 18B detect and release the proportional pressure reduction of the rear wheel brakes 15A and 15B. Immediately The hydraulic pressure acting on the pressure detection holes 24, 24 is generated by the ABS devices 16A, 16B. 2 and the plunger 36 moves upward in FIG. 2 due to the elastic biasing force of the spring 41. The hydraulic pressure that moves and therefore acts on the inlet hole 21 passes through the seal valve 42 to the rear wheel. It is supplied to the brakes 18A and 18B without being reduced in pressure.

[0045]   Therefore, the brake fluid pressure of the rear wheel brakes 18A, 18B is Even if the pressure of 11 is not increased, that is, the brake pedal 50 is not depressed. By releasing the depressurizing action of the P valves 18A and 18B, the master cylinder It rises toward the hydraulic pressure of 11, and is suppressed by the proportional pressure reduction of the P valves 18A and 18B. It is possible to make maximum use of the braking force that was spent.

[0046]   For example, in FIG. 4 described above, in the state indicated by the point A on the road surface having a certain friction coefficient μ1 When the anti-lock control of the front wheel brakes 14A and 14B starts, the P Lubes 18A and 18B release the proportional pressure reduction. Therefore, the driver Even if the dull 50 is not depressed, the brake fluid pressure of the rear wheel brakes 15A and 15B is Ascend to point B, only ABS devices 16C and 16D for rear wheel brakes 15A and 15B Is activated to enter the antilock control state.

[0047]   Further, in the case of a road surface having another friction coefficient μ2, at the point C, the front wheel break When the anti-lock control of 14A and 14B starts, the P valves 18A and 18B are proportional The pressure reduction is released and the pressure of the rear wheel brakes 15A, 15B rises. Therefore, point D As shown in, the brakes of the front and rear wheel brakes 14A, 14B, 15A, 15B The hydraulic pressure approaches the proper distribution, and the front and rear wheels are not locked together.

[0048]   In all of the above cases, the braking efficiency is This is better than when the hydraulic pressure of the brake is reduced proportionally. Especially like the latter The front and rear wheel brakes 14A, 14B, 15A, 15B pressure is close to the proper distribution. If so, the driver further depresses the brake pedal 50, The distribution of the force can finally reach the ideal braking distribution S1.

[0049]   In the first embodiment, one of the first and second hydraulic systems 12 and 13 is used. If a failure occurs, the P valves 18A and 18B of the other hydraulic systems 12 and 13 will be lost. The reduced pressure due to the fall is detected and the reduced pressure action is canceled. Therefore, the oil that caused the above failures Rear wheel brake 15A on the same side as front wheel brakes 14A and 14B of pressure systems 12 and 13 , 15B brake fluid pressure rises, thus compensating for the decrease in braking force due to the above failure. can do.

[0050]   The first embodiment of the present invention shown in FIG. 5 is an antilock brake device for FR vehicles. Then, from the master cylinder 51 to the first hydraulic system 52, the left and right front wheel brakes While connecting to 53A and 53B, the second hydraulic system 54 is connected to the left and right rear wheel brakes. It is connected to 55A and 55B.

[0051]   Further, similarly to the first embodiment, the front wheel brakes 53A and 53B and the rear wheel brakes are also provided. Between the 55A and 55B and the master cylinder 51, there are ABS devices 57A and 57B. , 57C, 57D are connected.   In addition, the rear wheel brakes 55A, 55B and ABS devices 57C, 57D and the master train. P valves 58A and 58B are arranged between the binders 51.   The P valves 58A and 58B have the same characteristics as those of the first embodiment and have the same pressure detection holes. 60 is the same as the front wheel brakes 53A, 53B and ABS of the same hydraulic system 52, 54, respectively. It is connected between the devices 57A and 57B.

[0052]   In the anti-lock brake device of the second embodiment, the master cylinder The pressure from the da 51 is detected by the P valves 58A and 58B, and the pressure is the break pressure PM1. When the above is reached, the pressure of the rear wheel brakes 55A, 55B is adjusted to the front wheel brakes 53A, 53B. The pressure is proportionally reduced with respect to the pressure of B, 55A, 55B are appropriately distributed.

[0053]   At the time of the proportional decompression, the ABS devices 57A and 57B of the front wheel brakes 53A and 53B are When the anti-lock control is started by the operation, the pressure reduction by the anti-lock control is performed by the P valve. The front wheel brake 67A when the anti-lock control is started by the brakes 58A and 58B being detected. , 67B and the hydraulic system 52, 54 on the same side as the rear wheel brakes 55A, 55B proportional pressure reduction To release the brake fluid pressure of the rear wheel brakes 55A and 55B. The pressure is increased toward the hydraulic pressure of the cylinder 51.

[0054]   In addition, the first hydraulic system 54A connecting the front wheel brakes 53A, 53A has a failure. If it does, the P-valves 58A and 58B on both the left and right sides detect the pressure reduction due to the failure. Then, the proportional decompression of the left and right rear wheel brakes 55A and 55B is released. for that reason, If the braking force of the front wheel brakes 53A and 53B is weakened due to a failure, The front wheel brakes are set by increasing the brake fluid pressure of the rear wheel brakes 55A and 55B on the right side. It is possible to compensate for the failure of the keys 53A and 53B.

[0055]   The present invention is not limited to the above embodiment, and various modifications can be made. .   For example, as shown in FIG. 6, in the first embodiment, the ABS devices 16A, 16B Is connected to the pressure detection hole 24 of the P valve 18A, 18B, and the connection hole 61 is Of the first and second hydraulic systems 12, 13 so as to be connected to the wheel brakes 14A, 14B. It is possible to change the piping.   Also, the structure of the P valve is not limited to the above.

[0056]

[Effect of device]

  As is clear from the above description, the antilock brake device according to the present invention is   Between the front and rear wheel brakes and the master cylinder, the A locking device is installed, and the anti-lock device for the rear wheel brake and the master Each proportioning valve is located between the Connected between the front wheel brake on one side and the anti-lock device for the front wheel brake Therefore, when the proportioning valve reduces the rear wheel brake fluid pressure proportionally, If the front wheel brakes start anti-lock control, the proportioning valve Detects this as a decrease in the hydraulic pressure in the pressure detection hole, and can release the proportional pressure reduction. It

[0057]   Therefore, when the anti-lock control is started, the hydraulic pressure of the rear wheel brakes is The hydraulic pressure of the master cylinder Therefore, bring the distribution of the front and rear wheel brake fluid pressures closer to the ideal braking distribution. The braking performance can be improved.

[0058]   In addition, the antilock brake device according to the present invention causes the antilock operation. When not present, the proportional pressure reduction function of the proportioning valve will The distribution of the rear wheel brake hydraulic pressure can be obtained.

[0059]   In addition, if the hydraulic system fails, the proportioning valve will be proportionally reduced. Since the pressure can be released, the rear wheel brake fluid pressure is increased and The decrease in braking force can be compensated.

[0060]   The present invention achieves the above effects without providing a special hydraulic system or valve. Can be achieved, can simplify the structure and reduce the cost It has various advantages such as

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of an antilock brake device according to the present invention.

FIG. 2 is a cross-sectional view showing a proportioning valve.

FIG. 3 is a partially cutaway side view showing a seal valve.

FIG. 4 is a rear wheel brake hydraulic pressure showing the operation of the first embodiment.
It is a front wheel hydraulic diagram.

FIG. 5 is a configuration diagram showing a second embodiment.

FIG. 6 is a configuration diagram showing a modified example.

FIG. 7 is a configuration diagram showing an example of a conventional antilock brake device.

[Explanation of symbols]

1.14,53 Front wheel brake 2,11,51 Master cylinder 3,16,57 Anti-lock device 4,18,58 Proportioning valve

Claims (3)

[Scope of utility model registration request] 1. An antilock device is arranged between each of the left and right front wheel brakes, both left and right rear wheel brakes, and the master cylinder, and between the left and right rear wheel antilock devices and the master cylinder. A proportioning valve that proportionally reduces the output hydraulic pressure with respect to the input hydraulic pressure according to the pressure detected by each pressure detection hole is arranged, and the pressure detection holes of the proportioning valve are connected to the front wheel brake and the front wheel brake on the same side. Anti-lock brake device connected between the anti-lock device for the. 2. A proportioning valve as an X pipe connecting a hydraulic system connecting the left front wheel brake and the right rear wheel brake and a hydraulic system connecting the right front wheel brake and the left rear wheel brake to the master cylinder, respectively. 2. The anti-lock brake device according to claim 1, wherein the pressure detection hole is connected between a front wheel brake of a hydraulic system different from the hydraulic system provided with the proportioning valve and an anti-lock device for the front wheel brake. . 3. The antilock device according to claim 1, wherein a hydraulic system for connecting the left and right front wheel brakes and a hydraulic system for connecting the left and right rear wheel brakes are respectively connected to the master cylinder.