JPS6114024B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake device for a vehicle, etc., and particularly to one equipped with a brake control valve for starting on a climbing road.

Conventionally, this type of device has been equipped with at least two mutually independent brake systems that supply pressurized fluid from a brake master cylinder to a brake wheel cylinder through mutually independent piping systems, and one system has a climbing road. It is known that a brake control valve is provided which is capable of sensing and preventing fluid movement from the brake wheel cylinder to the brake master cylinder, and which can be opened and closed by an actuating body responsive to actuation of a clutch device.

In order to easily start a vehicle on a boarding road, such a device maintains the pressure in the brake wheel cylinder in response to a clutch disengagement operation performed following a brake engagement operation when stopping on a boarding road. The vehicle is maintained in a stopped state even after the brake operation is completed, and when the vehicle is started, the pressure is released in response to the clutch connection operation. As a result, when starting on an uphill road, the vehicle can be safely operated by performing two operations: depressing the accelerator pedal and gradually releasing the clutch pedal without operating the handbrake at the same time. This makes it possible to start the vehicle immediately, and prevent accidents caused by the vehicle or the like moving backwards due to failure to start.

However, in such devices, the brake control valve for maintaining pressure in the wheel cylinders is only installed in one of the multiple systems, so the total braking force is required to maintain the stopped state of the vehicle. There is a problem in that the vehicle backs up with the clutch pedal depressed after the brake operation is completed and an accident occurs.

In other words, in recent vehicles, the brake piping system is separated into a system that includes a brake wheel cylinder for the front wheels and a system that includes brake wheel cylinders for the rear wheels, or a so-called rear piping system that includes brake wheel cylinders for the front wheels and brake cylinders for the rear wheels. In many cases, the so-called X piping system is used, including one that includes a brake cylinder for the rear wheel, and one for the left front wheel and right rear wheel. Even if the pressure is maintained, the pressure at the time of stopping by supplying pressure to two systems is maintained, so the braking force for stopping is halved, and the vehicle etc. ends up moving backwards.

For this reason, the applicant first installed brake force control valves equipped with balls that move under their own weight in parallel, and made the two balls movable by a single camshaft linked to clutch operation. 55-21250)
proposed the above-mentioned problem in a two-system brake system.

According to this proposal, the lack of braking force can be solved, but since two balls are moved from the valve seat where the balls are seated on one camshaft against the pressure acting on the balls, this problem occurs. The camshaft requires a considerable amount of driving force, and as a result, the force required to press the clutch pedal becomes large, making the clutch heavy, making it difficult to operate the clutch quickly, and releasing the brake pressure at the time of starting off smoothly. I have a problem where I am unable to start.

In order to solve the above-mentioned problem without creating such a new problem, the brake wheel cylinder and brake master cylinder of the other system are connected to the other system at a first position and disconnected at a second position. In addition, one end side receives the brake wheel cylinder side pressure of the brake control valve in the one system and receives a biasing force toward the other end side, and the other end side receives the brake wheel cylinder side pressure of the brake control valve in the one system. A movable body is provided that receives the pressure of the system and receives a biasing force toward one end, and the movement of the movable body caused by the biasing force toward the other end becoming larger than the biasing force toward the one end causes the above-mentioned It is conceivable to switch the valve device to a second position, that is, a position where communication between the brake master cylinder and the brake wheel cylinder is cut off.

In this way, the valve device in the other system can be opened and closed by movable bodies that receive pressure at both ends, compared to the case where two valves are opened and closed using one camshaft as described above. Therefore, it is possible to maintain or release brake pressure in two systems without causing problems such as a heavy clutch.

However, as described above, if a valve device is provided in the other system and a movable body is provided to receive the biasing force due to the pressure of one system and the biasing force due to the pressure of the other system, the above-mentioned problem will occur. On the other hand, when the magnitude relationship of the biasing force reaches the condition described above, the valve device is switched to the second position by the movement of the movable body, and then it is desired to further supply higher pressure to the wheel cylinder side. There is a problem that the supply may become unavailable in some cases. Furthermore, if the valve device closes during air bleeding operations performed when such a brake control valve or valve device is installed on an actual vehicle, a problem arises in that air may not be able to be vented in the other system.

The present invention was made in view of the above-mentioned problems, and even after the valve device of the other system is switched to the position where communication between the brake master cylinder and the brake wheel cylinder is cut off by movement of the movable body, the The purpose of the present invention is to provide a brake device that is capable of supplying or moving the valve device, and in order to achieve this purpose, in the other system, from the brake master cylinder side of the valve device to the brake wheel cylinder side. This system is equipped with a second valve device that allows the movement of fluid and prohibits the reverse flow of fluid, whereby the movable body moves and the valve device is switched to the second position, and the brake master cylinder in the other system is switched to the second position. Even if the communication between the brake wheel cylinder and the brake wheel cylinder is cut off, the second valve device is provided, so that in the other system, the fluid (specifically, pressure fluid or air) on the brake master cylinder side of the valve device is ) is unaffected by the state in one system, and the second
It is possible to open the valve device and move the second valve device to the brake wheel cylinder side, supplying higher pressure to the brake wheel cylinder side, and converting air from the brake master cylinder side into pressurized liquid. Therefore, if each of them can move toward the brake wheel cylinder side, the following effects can be obtained.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a diagram showing a brake device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG.

In FIGS. 1 and 2, the brake device is indicated as a whole by 1, and the device 1 includes a brake tandem master cylinder 2 having two independent hydraulic pressure generating chambers (not shown) formed inside. are doing.

Note that this master cylinder 2 has two pistons slidably inserted in series into a cylinder hole with the same inner diameter over the entire length, and liquid is supplied between both pistons and between the inner piston and the bottom of the cylinder hole. The following description will be made assuming that the pressure generating chamber is formed independently and pressure is generated by an internal piston so that the pressure in both hydraulic pressure generating chambers is equal.

This master cylinder 2 is attached to the vehicle body A and is actuated by a brake pedal 3 which is swingably attached to the vehicle body A, and one hydraulic pressure generation chamber is connected to the piping 4, 5, 6 and the brake pedal. It is connected to each brake wheel cylinder (not shown) of a brake device 8 for the left front wheel and a brake device 9 for the right rear wheel via a control valve 7, and the other hydraulic pressure generating chamber is connected to piping 10, 11, 12 and brake control valve 7
It communicates with each brake wheel cylinder (not shown) of a brake device 14 for the right front wheel and a brake device 15 for the left rear wheel via an automatic valve 13 attached to the brake wheel.

In particular, when explaining the brake control valve 7,
The valve 7 has a stepped hole 17 whose diameter gradually increases in the forward direction of the vehicle, etc., and a hole 18 perpendicular to the stepped hole 17 (a first hole). ,
In Figure 2, the forward direction of the vehicle, etc. is to the left when facing the figure. ) A camshaft 19 serving as an actuating body is rotatably inserted into the hole 18, and the camshaft 19 has an eccentrically reduced diameter at a portion opposite to the open end of the stepped hole 17 relative to the hole 18. A cam 20 is provided,
There are two sealing members 2 on the same diameter part sandwiching the cam 20.
1 and a back-up spring 22 are respectively installed, and a cam chamber 23 that constitutes a part of the pipe diameter is partitioned. This cam chamber 23 is connected to the pipe 4 via a connection hole 24.

A recess 25 is provided at the lower end of the camshaft 19 to increase the volume between the camshaft 19 and the closed end of the hole 18, while the upper end of the camshaft 19 has a reduced diameter to accommodate the hole 18. A connecting portion 26 protrudes outward,
A rotating member 27 having a substantially triangular shape is attached to the connecting portion 26 using a nut 29 and a washer 30 together with a water-shielding skirt member 28 .

Referring to FIG. 1, this rotating member 27 has a wire 31 connected to one end (detailed shape and structure is not shown and is shown schematically), and swings an arm 32 for actuating the clutch. In response to the movement, the camshaft 19 can rotate together with the camshaft 19 by or against the tension of a release spring 33 stretched between it and the vehicle body A on the other end side.

Further, the camshaft 19 is moved by a sliding member 35 supported by a stopper 34 provided at the open end of the hole 18.
It is prevented from coming out of the hole 18 and is guided to slide during rotation. 36 is waterproof and dustproof boots.

On the other hand, a ball guide 38 having a spherical valve element 37 movable by its own weight is fitted in the large diameter hole of the stepped hole 17, and the ball guide 38 is fitted into the large diameter hole portion of the stepped hole 17. The main body 39 and a washer 41 with an elastic piece 40 provided between the main body 39 and the ball guide 38 are held in the illustrated position in contact with the stepped portion 42 .

An axial groove 4 is provided on the inner surface of the ball guide 38.
3 are formed in large numbers, and a valve seat assembly 44 on which the valve element 37 can be seated is provided at the end of the stepped portion 42.
is fitted.

This valve seat assembly 44 includes a seat member 45 made of rubber.
The seat member 45 is made up of a supporting member 46 that is connected to the seat member 45 by unevenness. By fitting the wall of the ball guide 38 into a groove 47 formed on the outer periphery of the seat member 45, the ball guide 38 can be attached to the ball guide 38. Installed in one piece. The seat member 45 has an annular protrusion (not shown) formed on the outer periphery for sealing the space between the seat member 45 and the inner surface of the intermediate diameter portion of the stepped hole 17.
An inner hole 48 is bored therein, and a plate portion 50 that can come into contact with the stepped portion 49 of the stepped hole 17 is formed.

A plunger 52 is movably inserted into the small diameter portion of the stepped hole 17 with a light spring 51 stretched between it and the support member 46 of the valve seat assembly 44. It is brought into contact with the cam 20 by the tension of 51. Further, the plunger 52 has a large number of axial grooves 53 formed on its outer periphery, and a valve seat assembly 44 on the left end side.
A small diameter portion 54 is formed that penetrates through the ball guide 38 and protrudes into the ball guide 38 to be able to come into contact with the valve element 37.

Reference numerals 55 and 56 are connection holes provided in communication with the large diameter hole of the stepped hole 17, and the connection hole 55 is connected to the pipe 6, and the connection hole 56 is connected to the pipe 5, respectively.

The automatic valve 13 is attached to the main body 16 of the brake control valve 7 using a plurality of bolts 57 of the main body 39.

The main body 16 has a stepped inner hole 58 that becomes larger in diameter toward the left, and the right end side of the smaller diameter hole of the inner hole 58 is connected to the inside of the stepped hole 17 through a through hole 59. The left end side communicates with a connection hole 60 that connects the pipe 10, and the large diameter hole communicates with connection holes 61 and 62 that connect the pipes 11 and 12, respectively. Further, a substantially axially shaped differential piston 63 is movably inserted into the inner hole 58 as a movable body, and a recess 65 of a lid 64 that closes the inner hole 58 is inserted.
and a recess 66 formed at the left end of the differential piston 63.
The differential piston 63 is biased to the right by a light spring 67 stretched between the two.

An inner hole 58 is provided on the outer periphery of the left side of the differential piston 63.
A lip-seal type sealing member 68 that can be sealed between the inner hole 58 and the piston 63 supports the inner and outer lips 71 and 72 via a back-up spring 70 at a step 69 of the inner hole 58 to form a recess 65 in the lid 64. The first pressure chamber 73 is inserted into the small diameter hole of the inner hole 58 and communicates with the connecting hole 60 .
is connected to the connection holes 61 and 62 in the large diameter hole and the second
The pressure chambers 74 are each partitioned. Further, a small hole 75 is bored in the cylindrical portion forming the recess 66 of the differential piston 63 and is movable to the left and right of the inner lip 71 of the sealing member 68.

Therefore, the differential piston 63 has a function as a movable body that switches the valve device that disconnects communication between the master cylinder 2 and the brake devices 14 and 15 in the system that communicates them, and also functions as a movable body that switches the valve device that disconnects the communication between the master cylinder 2 and the brake devices 14 and 15.
It has a function of configuring a valve device and a second valve device.

In addition, in FIGS. 1 and 2, 76 is a clutch pedal, 77 is a clutch wire provided between the clutch pedal 76 and the clutch operating arm 32,
78 is an engine, 79 is a transmission device, and 80 is a clutch device including the arm 32 for actuating the clutch. Note that these devices and the like are shown schematically to make the explanation easier to understand.

The clutch device 80 includes a flywheel 81 that rotates together with the engine 78, a pressure plate 82, a block 83 that moves according to the swing of the arm 32, and a diaphragm spring 84 that is disposed between the plate 82 and the block 83. Each has a wheel 81 and a plate 8.
2, and has a clutch disk 85 that can be frictionally engaged with both. Incidentally, such a clutch device 80 is widely known, and a detailed explanation thereof will be omitted.

In addition, in FIGS. 1 and 2, the member indicated by a is
A sealing member that is selected and used as appropriate depending on the installation location,
The member indicated by b is a back-up spring for sealing member a, the point indicated by d indicates the center of rocking or rotation of the pedal, etc., and the point indicated by e indicates the connection between the pedal, etc. and the wire. Each part is shown.

The functions of the device 1 will be described below.

Assume that the driver of the vehicle is not operating the cam or clutch and is driving the vehicle at an appropriate speed.

Then, the clutch disk 85 frictionally engages with the flywheel 81 and the pressure plate 82 under the action of the maximum load of the diaphragm spring 84, and enters a so-called clutch connected state.
The camshaft 19 is biased to the illustrated position by the tension of the release spring 33, so that the plunger 52
is moved to the left by the cam 20, and the small diameter portion 54 of the plunger 52 is in a position where it protrudes into the ball guide 38 beyond the valve seat assembly 44. Valve element 37 attempts to seat on valve seat assembly 44 but is unable to do so. In addition, since the brake is not applied, no pressure is generated inside each piping system, and the differential piston 63 is in a position where the small hole 75 is located to the right of the inner lip 71. , Therefore, the first pressure chamber 73 and the second pressure chamber 74 are in communication.

For example, when the driver approaches a railway crossing and depresses the brake pedal 3 to apply the brakes, pressurized fluid is discharged from the master cylinder 2 to the pipes 4 and 10, and each Pressure is generated in the piping system and pressurized fluid is supplied to the wheel cylinders of each brake device, so the brakes begin to apply. At this time, for the brake devices 8 and 9, the piping 4, the cam chamber 23, the plunger 52
The brake devices 14 and 15 are connected to the piping 10, the first pressure chamber 73, and the small hole 75 through the groove 53 of the valve seat assembly 44, the inner hole 48 of the valve seat assembly 44, the inside of the ball guide 38, and the piping 5, 6. Pressure fluid is supplied independently from the master cylinder 2 through the gap between the inner lip 71 and the differential piston 63 caused by the deformation of the inner lip 71, the second pressure chamber 74, and the piping 11, 12, respectively. be done.

In this state, the differential piston 63 does not move because the pressure discharged from the master cylinder 2 to the pipes 4 and 10 is equal, and the differential piston 63 receives this equal pressure with equal pressure receiving areas on the left and right sides. It is located at

Thereafter, when the vehicle etc. is sufficiently decelerated, the driver depresses the clutch pedal 76 deeply while keeping the brake pedal 3 depressed. Then, the clutch pedal 76 swings (or rotates) about point d.
Hereinafter, this will be simply referred to as oscillation. ), the brake operating arm 32 is moved to point d via the clutch wire 77.
In the clutch device 80, the diaphragm spring 84 moves to the left as the block 83 moves to the left.
is bent as a fulcrum, deforming the pressure plate 82 away from the flywheel 81, completely releasing the frictional engagement of the clutch disk 85 with the pressure plate 82 and the flywheel 81, and causing the so-called clutch disconnection. state. On the other hand, at the same time, due to the swinging of the clutch actuating arm 32, the rotating member 27 of the brake control valve 7 moves counterclockwise in FIG. Rotate against the force. The rotation of the rotation member 27 causes the camshaft 19 to
rotates, and as the cam 20 and the plunger 52 swing and the cam 20 is displaced, the plunger 52 moves to the right due to the biasing force of the spring 51, and finally the valve element 37 is attached to the valve seat assembly 44. The small diameter portion 54 is moved sufficiently to the right to allow the user to sit.

In this state, when the vehicle etc. comes to a complete stop and the driver removes his foot from the brake pedal 3, the valve element 37
The piping 4 is separated by the contact area between the valve seat assembly 44 and the valve seat assembly 44.
Although the pressure on the side is released, the pressure on the pipes 5 and 6 is maintained as it is.

Furthermore, in the automatic valve 13, although the pressure in the second pressure chamber 74 decreases as the pressure on the piping 10 side decreases, the pressure remains in the stepped hole 17, so that the pressure in the second pressure chamber 74 decreases. When the pressure within the pressure chamber 74 decreases to a certain extent, the leftward movement force generated by the differential piston 61 receiving the pressure transmitted from the stepped hole 17 at the right end causes the differential piston 61 to move to the left into the second pressure chamber at the left end. It becomes larger than the rightward movement force generated by receiving the pressure inside 74, and the differential piston 63 moves to the left, and the small hole 7
5 is located on the left beyond the inner lip 71.

As a result, pressure is maintained on the piping 11 and 12 sides as well. Therefore, in addition to the pressure being maintained in the pipes 5, 6, the brake devices 8, 9,
Pressure is maintained in all wheel cylinders 14 and 15.

With the operations up to this point, the vehicle, etc. will be set to the clutch pedal 7.
6, the clutch is disconnected and the brake is firmly applied to maintain the stopped state.

In such a situation, if the slope becomes large just before the vehicle comes to a stop, even if the hydraulic pressure is maintained as it was when the slope was small, there will be insufficient braking force and there is a possibility that the vehicle will move backwards. However, in this case, when the brake pedal 3 is depressed every time, the pressure on the master cylinder 2 side becomes higher than the pressure on the wheel cylinder side, the inner lip 71 deforms and the pressure flows from the first pressure chamber 73 to the second pressure chamber. Pressure liquid will be supplied toward the pressure chamber 74, and at the same time, the valve element 37 will also be supplied to the cam chamber 23 in accordance with the pressure difference acting back and forth.
The wheel cylinders of each brake device 8, 9, 14, 15 receive higher pressure because they are separated from the valve seat assembly 44 so that pressurized fluid is supplied into the ball guide 38 from the side. This eliminates the lack of braking force. After this, remove your foot from the brake pedal 3 again and press the master cylinder 2.
, the pressure in the pipes 4, 10 is released, but in the same manner as before, i.e., the valve element 37 is seated in the valve seat assembly 44 and the differential piston 63 is seated in the small hole 75. By being located on the left side of the inner lip 71, pressure is maintained in each wheel cylinder and the stopped state is maintained.

Next, a case where the driver starts the vehicle will be described.

Now, as mentioned above, in order to start the vehicle from a stopped state by depressing only the brake pedal 77, the driver first depresses the accelerator pedal (not shown) and increases the rotational speed of the engine 78 slightly. While doing so, gradually return the clutch pedal 76 to the inoperative position (return position). Then, the clutch actuating arm 32 swings in the opposite direction to when the clutch is disengaged, and the clutch lever 85 receives a portion of the maximum load of the diaphragm spring 84, causing the flywheel 81 and pressure plate 82 to move.
This is a so-called anti-clutch state in which the clutch is frictionally engaged with the clutch. Further, in the brake control valve 7, the rotating member 27
is rotated clockwise by the biasing force of the release spring 33, and the cam 20 is accordingly displaced to move the plunger 52, and the small diameter portion 54 of the plunger 52 is rotated clockwise.
by bringing the valve element 37 into contact with the valve element 37 and separating the valve element 37 from the valve seat assembly 44.
Release the internal pressure to the master cylinder 2 side. As the pressure inside the pipes 5 and 6 decreases, the differential piston 6
The hydraulic pressure acting on the right end side of the differential piston 63 also decreases, and the biasing force that biases the differential piston 63 to the left is transferred to the second pressure chamber 7.
4 becomes smaller than the biasing force created by the sum of the rightward biasing force generated by the pressure received at the left end and the tension of the spring 67, the differential piston 63 moves to the right and closes the small hole 75. It is shifted to the right side of the inner lip 71. As a result, the second pressure chamber 74 and the first pressure chamber 7
3 communicate with each other, and the pressure inside the pipes 11 and 12 decreases. At this time, if the pressure in the pipes 11 and 12 decreases faster than the pressure in the pipes 5 and 6, the rightward biasing force acting on the differential piston 63 will be greater than the leftward biasing force. becomes smaller, and the differential piston 63 moves to the right due to this biasing force difference, and the small hole 7
5 is again displaced to the left side of the inner lip 71 to restrict the free communication of the second pressure chamber 74 to the first pressure chamber 73, thereby restricting the pressure drop within the pipes 11 and 12. , the pressure in the pipes 11 and 12 is reduced at a rate corresponding to the pressure drop in the pipes 5 and 6.

With this, the wheels (driving wheels) are driven by the engine 7.
8 through the clutch device 80, the pressure in each wheel cylinder decreases, and the braking force applied to the wheels gradually decreases. It can be started on the road.

After starting, if the clutch pedal 76 is fully returned,
The clutch is now fully engaged and the pressure in each wheel cylinder has also been released, resulting in normal driving.

According to these above-described embodiments, the pipes 4, 5,
In the system including pipes 10, 11, and 12, a device is provided that allows the valve element 37 to be placed on and off the valve seat assembly 44 in conjunction with the clutch operation, and in the system including pipes 10, 11, and 12, In other words, the system is equipped with a device that can detect that the pressure is contained in the pipes 11 and 12 in response to the activation of the brake control valve 7, so that the two systems can be separated. By containing the pressure, it is possible to secure sufficient braking force to stop on the boarding road, and
In particular, both the brake control valve 7 and the automatic valve 13 are equipped with valve devices that allow fluid to move from the master cylinder 2 side to each wheel cylinder in order to contain even higher pressure even after activation. Even when the slope changes significantly, it is possible to contain or maintain the pressure sufficient to maintain the stopped state, so it is highly reliable in ensuring stopping on the uphill road.

In addition, in the automatic valve 13, the brake is released through the small hole 75, so when the pressure on the master cylinder 2 side is released when stopping on the uphill road, the throttle effect of the small hole 75 is used. Then, the second
Since the pressure in the pressure chamber 74 is prevented from decreasing as quickly as in the first pressure chamber 73, a pressure with little pressure drop can be maintained in the second pressure chamber 74 side, improving the reliability of stopping. There is.

Furthermore, as described above, since the automatic valve 13 is provided with a valve device that provides fluid movement from the master cylinder 2 side to the wheel cylinder side, the stepped hole 17 Even if the system including the second pressure chamber 74 is vented first, the system including the second pressure chamber 74 can be vented easily.

In other words, the air purge work involves exhausting the air present in the entire piping system from the brake master cylinder to the brake wheel cylinder to the outside of the piping system when it is first installed on an actual vehicle or when replacing parts.
This is the process of filling the piping system with hydraulic fluid, and the specific method for doing so is the pumping method.Tightly screw the bleeder screw provided on the brake wheel cylinder, and then pump the brake master cylinder 2 several times. The first step is to supply the hydraulic fluid from the reservoir to the hydraulic pressure generating chamber of the master cylinder 2 by repeatedly operating it, and to generate and maintain pressure within the piping system.The bleeder screw is loosened. A second step in which the inside of the brake wheel cylinder is communicated with the outside air, and the air compressed to the above pressure is expanded and released into the outside air. By repeating these first and second steps, the air is discharged through the bleeder screw. This method continues until the air runs out.

Vacuum method This is a method in which the inside of the piping system is sealed, air is sucked from inside the piping system using a vacuum pump through the opening of the master cylinder's reservoir, and then hydraulic fluid is supplied under positive pressure using another pump.

Pressure feeding method A method in which hydraulic fluid pressurized by a pump is supplied from the opening of the reservoir, and the air in the piping system is discharged from the bleeder via the hydraulic fluid.

In some cases, the popping method and pressure feeding method are combined.

All of these methods utilize the differential pressure between positive pressure and atmospheric pressure or the differential pressure between negative pressure and atmospheric pressure (or positive pressure), so during these operations,
When a relatively high pressure acts on the right end side of the differential piston 63 and a relatively low pressure acts on the left end side, a biasing force is generated that moves the differential piston 63 to the left, and the differential piston 63 moves. However, when relatively high pressure hydraulic fluid or air is supplied to the first pressure chamber 73, the communication between the first pressure chamber 73 and the second pressure chamber 74 is cut off. The inner lip 71 is deformed by the differential pressure with respect to the differential piston 63 and can flow into the second pressure chamber 74 side.
It is possible to prevent air venting from being obstructed by the movement of the cylinder, and by allowing movement of the hydraulic fluid from the master cylinder 2 side to the brake wheel cylinder side, the air venting work can be performed reliably.

As described above, various effects are achieved according to the embodiments described above, but the present invention can be implemented without being limited to the embodiments described above.

That is, in the above embodiment, the master cylinder 2 is of the most general type and is of the type in which equal pressure is generated in two independent hydraulic pressure generating chambers, but a two-system type If so, the models may be different, and the pressures generated in the two hydraulic pressure generating chambers may be different. When using a model that creates this pressure difference,
Although the pressure in the piping system connected to either one is relatively high and the other is relatively low, there are two combinations of installation of the brake control valve 7 and automatic valve 13 in the above-mentioned embodiment. , an example in which the brake control valve 7 is provided in a relatively high system and an automatic valve 13 in a relatively low system, and vice versa. In the above example, the differential piston 63 as a movable body is moved simultaneously with the operation of the master cylinder to close the valve device, but it is possible to supply a higher pressure by using the second valve device. There is no problem, and in the latter example, the valve device is not closed until the biasing force against the movable body meets a predetermined condition, but it is maintained in a system where it becomes relatively low, much like the illustrated embodiment. It is possible to maintain a relatively high pressure in a system that is slightly lower than the pressure in the system. Therefore, the former example is preferable because the retained liquid pressure becomes high.

Further, not only the master cylinder but also the automatic valve, that is, the valve device and the second valve device may be used as examples shown below.

FIG. 3 shows another example of the automatic valve.

In the example shown in FIG. 3, instead of using a lip seal type sealing member, a disc 91 with a small hole 90 formed in an annular shape and a plate-shaped part having a hole 92 in the center and capable of closing the small hole 90 are used. Rubber valve body 94 with 93
This valve invention 9 uses a valve device 95 that combines
5 toward the differential piston 97 by a light spring 96, and by moving the differential piston 97 to the left, the entire valve device 95 is moved to the wheel cylinder side of one of the two piping systems. It is configured to sit facing a lid 99 in which a connection hole 98 is formed to be connected to the lid 99.

In the example shown in FIG. 3, the valve device that communicates the master cylinder and the wheel cylinder at the first position and shuts off the communication at the second position includes the inner end surface of the lid 99, the valve body 94,
The movable body that moves this valve device to the second position is composed of a disc 91 and a member such as a disc 91, and the movable body that moves the valve device to the second position is constituted by an operating piston 97. Furthermore, the valve device is switched to the second position by movement of the differential piston 97. The second valve device, which allows fluid to move from the master cylinder side to the wheel cylinder side and prohibits the reverse flow when
It is formed from the part marked 3.

To briefly explain the operation of the example shown in FIG. 3, when the differential piston 97 moves to the left due to the difference in hydraulic pressure acting on both ends thereof, the valve body 94 seats on the inner end surface of the lid 99. to cut off communication between the master cylinder side and the wheel cylinder side. However, when supplying even higher pressure to the wheel cylinder side, a small hole 90 is formed in the right end of the plate-like portion 93 of the valve body 94.
As the fluid pressure flowing through becomes higher than the fluid pressure acting on the right end side of the plate-shaped portion 93,
The plate-shaped portion 93 is deformed to the left side. Due to this deformation of the plate-like portion 93, higher pressure can be supplied to the wheel cylinder side. (Please note that this third
In the example shown in the figure, the differential piston 97 as a movable body moves depending on the magnitude of the biasing force acting in the left and right directions, so the operation of maintaining and releasing the hydraulic pressure is the same as that in Figures 1 and 2. The same is true. ) Also, when the pressure on the wheel cylinder side is maintained and the pressure on the master cylinder side is released, the plate portion 93 is pressed against the disc 91 by a differential pressure, so that the small hole 90 is pressed against the disk 91.
This prevents pressure from leaking from the wheel cylinder side.

Further, FIG. 4 is a diagram showing another example of a valve device 95' and a differential piston 97' in an example similar to that of FIG. 3.

In this example, the valve device 95' has a small hole 90' formed in a plate part 101 that is integrally provided with a differential piston 97' through a groove 100, and a plate-like plate that can close this small hole 90'. A valve body 94' is integrally attached to a differential piston 97' by a spring receiver 102, and the spring receiver 102 is provided with a number of elastically deformable pawls 103 for preventing removal.

The valves shown in Figs. 3 and 4 also exhibit the same functions and effects as the automatic valves 13 shown in Figs. 1 and 2, but differ from those shown in Figs. 1 and 2 in specific shapes, etc. It is something.

Also, the configuration of the brake control valve itself can be changed from that shown in the figure, for example, as shown in Japanese Utility Model Application Publication No. 55-16930, a reciprocating type camshaft is used instead of a rotary type camshaft. Or, Utsukai Showa 55-33822
As shown in the Japanese Patent No. 3, it is also possible to use a clutch that utilizes the hydraulic pressure of a hydraulic clutch.

Furthermore, in the example of FIGS. 1 to 4, the pressure receiving area for one system of the differential piston of the automatic valve and the pressure receiving area for the other system (both pressure receiving areas mean the area that receives the contained pressure. ), but it goes without saying that the latter may be made slightly smaller than the former to prevent pressure drop when maintaining a stop, or conversely, the latter may be made slightly larger than the former (for pitching (In other words, within the range that does not adversely affect stopping on the road, in other words, within the range that does not cause insufficient braking force.) During normal brake operation, the other system is given priority in releasing the brakes. Good too.

In addition, in the examples shown in Figures 1 and 2, the pressure drop on the wheel cylinder side of the other system is prevented to some extent by the throttling effect of the small hole 75, but even if a small passage with a throttling effect is not particularly provided, If sufficient pressure remains on the wheel cylinder side due to the presence of piping resistance, there is no need to provide a small passage as described above, and if piping resistance etc. is extremely small,
Alternatively, in cases where it takes a long time to move the differential piston, a limited small passage may be provided to the extent necessary.

Furthermore, although Figures 1 and 2 show an example of X piping, it goes without saying that other well-known piping systems may also be used. Instead of providing a second valve device that allows the flow of water and prohibits its backflow to be integrated with the valve device to form one automatic valve as in the embodiment, it is possible to install the second valve device in the piping connected to the valve device. A second valve device may be connected in a bypass manner.

As described above, in the present invention, in short, one system has a brake control valve that is opened and closed by an actuator that responds to the operation of the clutch device, and the other system has a brake control valve that receives pressure from both systems. A valve device is provided that is opened and closed by a movable body that moves depending on the difference in the applied biasing force, and a second valve device is further provided in the other system that allows fluid movement from the master cylinder to the wheel cylinder and prohibits reverse flow. By using the movable body to open and close the valve device, the actuating body only has to open and close the brake control valve, and the operating force required to open and close the brake control valve of the actuating body applies pressure to only one system. Furthermore, since the present invention is provided with a second valve device, even after the valve device in the other system is closed, there is no increase in the amount of water flowing to the wheel cylinder side of the valve device. Pressure fluid can be supplied and insufficient braking force can be prevented. That is, the present invention makes it possible to supply sufficient pressure fluid to both systems so as not to cause insufficient braking force when stopping on a boarding road. It can be prevented. In addition, even if the valve device closes due to the movement of the movable body during air purge work to remove air from the piping when installed on an actual vehicle, air can be vented through the second valve device, ensuring that the air purge work can be performed reliably. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a cross section along the line A in FIG. 1, and FIGS. 3 and 4 are
FIG. 7 is a diagram showing other embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Brake device, 2... Brake tandem master cylinder, 8, 9, 14, 15... Wheel brake device, 63... Differential piston, 68... Sealing member, 7
1...Inner lip.

Claims (1)

[Claims] 1 Equipped with two mutually independent brake systems that supply pressurized fluid from the brake master cylinder to the brake wheel cylinders through mutually independent piping systems, and one system has a system that supplies pressure fluid from the brake wheel cylinders to the brake wheel cylinders when it detects that it is a climbing road. A brake control valve is provided that can prevent fluid movement toward the brake master cylinder and that can be opened and closed by an actuating body responsive to actuation of the clutch device, and the brake wheel cylinder and brake master cylinder of the other system are connected to each other in the other system. A switchable valve device is provided so as to communicate in a first position and shut off in a second position, and one end receives the brake wheel cylinder side pressure of the brake control valve in the one system, and the other end receives the brake wheel cylinder side pressure of the brake control valve in the one system. A movable body is provided on the other end side that receives the pressure of the other system and receives a biasing force toward the one end, and the biasing force toward the other end is greater than the biasing force toward the one end. Due to the movement of the movable body caused by increasing size,
In the brake device configured to switch the valve device to a second position, the other system includes a second system that allows fluid movement from the brake master cylinder side of the valve device to the brake wheel cylinder side and prohibits the reverse flow. A brake device equipped with a valve device.