JP2008189047A - Liquid pressure distribution ratio adjusting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid pressure distribution ratio adjusting device capable of obtaining high operational accuracy and high repeatability about a change of the ratio of the liquid pressure between a front wheel brake and a rear wheel brake. <P>SOLUTION: The liquid pressure distribution ratio adjusting device is equipped with a first liquid pressure generation device 6 and a first balance cylinder 23 connected to the front wheel brake 4, a second liquid pressure generation device 7 and a second balance cylinder 24 connected to the rear wheel brake 5, a first balance piston 25 internally inserted to the first balance cylinder 23, the second balance piston 26 internally inserted to the second balance cylinder 24, the second balance push rod 31 pressing this with each other, and a balance bar 35 which is engaged with the balance push rod 27 and the second balance push rod 31 and turnably supported between them. The ratio between distance L1 from the turning center of the balance bar 35 to the first balance push rod 27 and the distance L2 to the second balance push rod 31 can be changed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hydraulic pressure distribution ratio adjusting device that adjusts a distribution ratio of hydraulic pressure generated between a front wheel brake and a rear wheel brake.

In a two-system brake system that generates hydraulic pressure in the front wheel brake and the rear wheel brake, the hydraulic pressure ratio between the front wheel brake and the rear wheel brake can be changed, so that the rear wheel can be prevented from being locked. Can be maintained stably. And the brake system (hydraulic pressure distribution ratio adjusting device) that can change the hydraulic pressure ratio between the front wheel brake and the rear wheel brake by remote control according to the load fluctuation of the car body and the change of weather condition is proposed. (For example, refer to Patent Document 1).
Japanese Utility Model Publication No. 5-15179

  However, in the conventional hydraulic pressure distribution ratio adjusting device, there is a case where high operation accuracy and high reproducibility cannot be obtained for the change in the hydraulic pressure ratio between the front wheel brake and the rear wheel brake.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a hydraulic pressure distribution ratio adjusting device capable of obtaining high operation accuracy and high reproducibility for changing the hydraulic pressure ratio between the front wheel brake and the rear wheel brake. And

  The present invention relates to a first hydraulic pressure generating device that is connected to a front wheel brake and outputs a hydraulic pressure corresponding to a brake operation, and a hydraulic pressure that is connected to a rear wheel brake and that corresponds to the brake operation simultaneously with the first hydraulic pressure generating device. , A first balance cylinder connected to the front wheel brake and the first hydraulic pressure generator, the rear wheel brake and the second wheel provided in parallel with the first balance cylinder. A second balance cylinder connected to the hydraulic pressure generator, a first balance piston inserted into the first balance cylinder, a second balance piston inserted into the second balance cylinder, and the first balance piston; A first balance push rod that pushes against each other, a second balance push rod that pushes against the second balance piston, and a first engagement portion. Engage with the first balance push rod, engage with the second balance push rod at the second engagement portion, and rotatably support at an intermediate portion between the first engagement portion and the second engagement portion. A balance bar, and a first distance from the center of rotation of the balance bar to the first engaging portion, and a second distance from the center of rotation of the balance bar to the second engaging portion. It is a hydraulic pressure distribution ratio adjusting device in which the ratio can be changed.

  In the present invention, the first balance cylinder, the second balance cylinder, the first balance piston, the second balance piston, the first balance push rod, the second balance push rod, and the balance bar provide hydraulic pressure. It constitutes a balance unit that adjusts the distribution ratio. The balance unit is separated from the first hydraulic pressure generator and the second hydraulic pressure generator that generate hydraulic pressure. In the first hydraulic pressure generating device and the second hydraulic pressure generating device in the conventional hydraulic pressure distribution ratio adjusting device, not only the hydraulic pressure is generated, but also the generated hydraulic pressure (hydraulic pressure value) is changed. However, the hydraulic pressure distribution ratio, which is the ratio between the hydraulic pressures, is changed by changing the hydraulic pressure. According to the present invention, the first hydraulic pressure generating device and the second hydraulic pressure generating device need only generate the hydraulic pressure as the hydraulic pressure generating source, and the first hydraulic pressure generating device is used in the balance unit. And the hydraulic pressure distribution ratio of those hydraulic pressures is changed using the hydraulic pressure generated by the second hydraulic pressure generator.

  Thus, the balance unit is newly provided, the first hydraulic pressure generator and the second hydraulic pressure generator are specialized to the hydraulic pressure generation source, and the change of the hydraulic pressure distribution ratio is changed to the first hydraulic pressure generator and the first hydraulic pressure generator. Since the balance unit is used instead of the two-hydraulic pressure generator, the components of the first hydraulic pressure generator and the second hydraulic pressure generator can be simplified. In other words, the movement of the component can be configured only by one-dimensional and two-dimensional movements that are not three-dimensional, and therefore, rattling is unlikely to occur. Further, since the balance unit can also be configured with only one-dimensional and two-dimensional motions that are not three-dimensional, rattling is unlikely to occur. For these reasons, the hydraulic pressure distribution ratio adjusting device of the present invention can obtain high operation accuracy and high reproducibility for changing the hydraulic pressure ratio between the front wheel brake and the rear wheel brake.

  In the balance unit, hydraulic pressure is generated in the first balance cylinder by the first hydraulic pressure generator, and the first balance piston pushes the first engagement portion of the balance bar via the first balance push rod. Similarly, hydraulic pressure is generated in the second balance cylinder by the second hydraulic pressure generator, and the second balance piston pushes the second engagement portion of the balance bar via the second balance push rod. Here, since the balance bar is rotatably supported in the intermediate portion, it functions like a seesaw that moves on one plane with the pivot center of the balance bar as a fulcrum. If only the function of this seesaw is realized, it can be easily realized only by combining one-dimensional motion.

  For example, it is assumed that the first distance from the rotation center of the balance bar to the first engagement portion is shorter than the second distance from the rotation center of the balance bar to the second engagement portion. Further, it is assumed that the same hydraulic pressure is generated in the first balance cylinder and the second balance cylinder. The second balance piston and the second balance push rod move so that the volume of the pressure liquid in the second balance cylinder on the second distance side longer than the first distance increases, and the pressure liquid in the second balance cylinder moves. The pressure drops. On the other hand, the first balance piston and the first balance push rod move so that the volume of the pressurized liquid in the first balance cylinder on the first distance side is reduced, and the hydraulic pressure of the pressurized liquid in the first balance cylinder is To rise.

  The first balance piston and the first balance push until the ratio of the hydraulic fluid pressure in the second balance cylinder to the hydraulic fluid pressure in the first balance cylinder matches the ratio of the first distance to the second distance. The rod, the second balance piston, and the second balance push rod move. With this movement, the balance bar rotates, but rotates around one rotation axis passing through the rotation center. Further, as the hydraulic pressure of the hydraulic fluid in the second balance cylinder decreases, the hydraulic pressure of the hydraulic fluid in the rear wheel brake and the second hydraulic pressure generator also decreases to the same hydraulic pressure. Similarly, as the hydraulic pressure of the hydraulic fluid in the first balance cylinder increases, the hydraulic pressure of the hydraulic fluid in the front wheel brake and the first hydraulic pressure generator also increases to the same hydraulic pressure. Thus, the distribution ratio of the hydraulic pressure can be determined as the ratio between the first distance and the second distance. Then, for example, by moving the position of the rotation center on the balance bar, or by moving the positions of the first engagement portion and the second engagement portion on the balance bar, the first distance and the second distance The ratio of the first distance and the second distance can be changed, and finally the hydraulic pressure distribution ratio can be changed.

  In the present invention, since the ratio between the first distance and the second distance can be changed, the components of the balance bar cannot be configured only by components that perform only one-dimensional movement, and higher-order two-dimensional. Parts capable of moving are required, but parts capable of moving up to three dimensions are not required.

  The first hydraulic pressure generating device includes a first hydraulic pressure generating cylinder connected to the front wheel brake, and a first hydraulic pressure generating piston inserted in the first hydraulic pressure generating cylinder and pushed by the brake operation. It is preferable to provide. The second hydraulic pressure generator is integrated with the first hydraulic pressure generating cylinder and integrated with the second hydraulic pressure generating cylinder connected to the rear wheel brake, and the first hydraulic pressure generating piston. It is preferable to include a second hydraulic pressure generating piston that is inserted into a second hydraulic pressure generating cylinder and is pushed simultaneously with the first hydraulic pressure generating piston by the brake operation.

  In the case of the conventional hydraulic pressure distribution ratio adjusting device, the first hydraulic pressure generating device and the second hydraulic pressure generating device generate the hydraulic pressure having a variable ratio, and the first hydraulic pressure generating piston and the second hydraulic pressure are generated. Since it was necessary to move the pressure generating piston freely without interfering with each other, the first hydraulic pressure generating cylinder and the second hydraulic pressure generating cylinder are arranged apart from each other, and the first hydraulic pressure generating piston and the second hydraulic pressure are arranged. The generating piston was also arranged away from each other.

  In the present invention, the first hydraulic pressure generating device and the second hydraulic pressure generating device need only generate the hydraulic pressure individually, so that the first hydraulic pressure generating cylinder and the second hydraulic pressure generating cylinder are integrated. Can be arranged. Further, the first hydraulic pressure generating piston and the second hydraulic pressure generating piston can be integrated and arranged. For this reason, the multiple hydraulic pressure generating device constituted by the first hydraulic pressure generating device and the second hydraulic pressure generating device can be handled as if constituted by one cylinder and one piston. For this reason, for example, even when the first hydraulic pressure generating device and the second hydraulic pressure generating device (multiple hydraulic pressure generating devices) are connected to the brake pedal, conventionally, two hydraulic pressure generating cylinders are provided on the left and right sides of the brake pedal. However, in the present invention, since a plurality of hydraulic pressure generators may be laid out as a single hydraulic pressure generating cylinder, the degree of layout freedom can be expanded and the multiple hydraulic pressure generators can be easily arranged. Can be placed.

  According to the present invention, it is possible to provide a hydraulic pressure distribution ratio adjusting device capable of obtaining high operation accuracy and high reproducibility for changing the hydraulic pressure ratio between the front wheel brake and the rear wheel brake.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
FIG. 1 is a configuration diagram of a hydraulic pressure distribution ratio adjusting apparatus 1 according to the first embodiment of the present invention. The hydraulic pressure distribution ratio adjusting device 1 includes a multiple hydraulic pressure generator 2 that generates two individual hydraulic pressures, and a balance unit 3 that changes the ratio of the two generated individual hydraulic pressures to a desired ratio. It is configured. The hydraulic pressure distribution ratio adjusting device 1 is mounted on a vehicle having front and rear wheels, a front wheel brake 4 that brakes the front wheels, and a rear wheel brake 5 that brakes the rear wheels.

  The multiple hydraulic pressure generator 2 is connected to the front wheel brake 4 by a first pressure-resistant tube 8 and outputs a hydraulic pressure corresponding to the brake operation, and to the rear wheel brake 5 by a second pressure-resistant tube 9. The second hydraulic pressure generator 7 is connected and outputs the hydraulic pressure corresponding to the brake operation simultaneously with the first hydraulic pressure generator 6.

  The first hydraulic pressure generating device 6 is inserted into the first hydraulic pressure generating cylinder 11 connected to the front wheel brake 4 by the first pressure-resistant tube 8, and the first hydraulic pressure generating cylinder 11, and is pushed by a brake operation. A first hydraulic pressure generating piston 13 and a first hydraulic pressure generating push rod 15 that pushes the first hydraulic pressure generating piston 13 by a brake operation.

  The second hydraulic pressure generating device 7 is integrated with the first hydraulic pressure generating cylinder 11 and is connected to the rear wheel brake 5 by a second pressure-resistant tube 9, and a second hydraulic pressure generating cylinder 12 is provided. A second hydraulic pressure generating piston 14 that is inserted into the cylinder 12 and pushed by a brake operation, and a second hydraulic pressure generating push rod 16 that pushes the second hydraulic pressure generating piston 14 by a brake operation are provided. . The second hydraulic pressure generating piston 14 is integrated and interlocked with the first hydraulic pressure generating piston 13 via the first hydraulic pressure generating push rod 15, and is pushed simultaneously with the first hydraulic pressure generating piston 13 by a brake operation. The

  In the case of the conventional hydraulic pressure distribution ratio adjusting device, the first hydraulic pressure generating device 6 and the second hydraulic pressure generating device 7 generate the hydraulic pressure with a variable ratio, and the first hydraulic pressure generating piston 13 Since it was necessary to move the second hydraulic pressure generating piston 14 freely without interfering with each other, the first hydraulic pressure generating cylinder 11 and the second hydraulic pressure generating cylinder 12 are separated from each other, and the first hydraulic pressure generating cylinder is generated. The piston 13 and the second hydraulic pressure generating piston 14 are also arranged apart from each other.

  In the hydraulic pressure distribution ratio adjusting apparatus 1 according to the first embodiment, the first hydraulic pressure generating device 6 and the second hydraulic pressure generating device 7 need only generate the hydraulic pressure individually. The cylinder 11 and the second hydraulic pressure generating cylinder 12 can be arranged integrally. Moreover, the 1st hydraulic pressure generation piston 13 and the 2nd hydraulic pressure generation piston 14 can be arrange | positioned integrally. For this reason, the multiple hydraulic pressure generating device 2 configured by the first hydraulic pressure generating device 6 and the second hydraulic pressure generating device 7 is handled as if it is configured by one cylinder and one piston. Can do. That is, the brake pedal 20 is hinged to the vehicle chassis 21 using the uniaxial rotary joint 19 so that the brake pedal 20 can rotate about the single axis. The brake pedal 20 is hinged to the second hydraulic pressure generating push rod 16 by using a uniaxial rotary joint 18 so that the brake pedal 20 can be rotated about a single axis. At the cylindrical closed end of the first hydraulic pressure generating cylinder 11, the multiple hydraulic pressure generating device 2 uses a uniaxial rotary joint 17 so as to be rotatable about a single axis as a rotational axis. Butterfly.

  The balance unit 3 is provided in parallel with the first balance cylinder 23 connected to the front wheel brake 4 by the first pressure tube 8 and the first balance cylinder 23, and is connected to the rear wheel brake 5 by the second pressure tube 9. The second balance cylinder 24, the first balance piston 25 inserted in the first balance cylinder 23, the second balance piston 26 inserted in the second balance cylinder 24, and the first balance piston 25 are pushed together. The first balance push rod 27, the second balance piston 26, the second balance push rod 31 that pushes against each other, and the balance bar 35 are provided. The first balance cylinder 23 and the second balance cylinder 24 are fixed in parallel to the vehicle chassis 22. Further, the first balance cylinder 23 and the second balance cylinder 24 may be integrated in parallel.

  The balance bar 35 is engaged with the first balance push rod 27 at the first engagement portion, and is engaged with the second balance push rod 31 at the second engagement portion. The balance bar 35 is supported by the vehicle chassis 22 via a support shaft 38 so as to be rotatable at an intermediate portion between the first engagement portion and the second engagement portion. The first balance cylinder 23 and the second balance cylinder 24 are fixed to the chassis 22 so as not to move.

  The first balance push rod 27 has a first piston side rod 28 that pushes the first balance piston 25 and one end connected to the first piston side rod 28 so as to be swingable. It has the 1st bar | burr side rod 30 which an other end connects to an engaging part. The first bar-side rod 30 is hinged to the first piston-side rod 28 by using a uniaxial rotary joint 29 so that the first bar side rod 30 can rotate about one axis. Further, the first bar side rod 30 can be rotated with the first bar side rod 30 as a rotation axis, and the balance bar 35 can be rotated with the length direction of the balance bar 35 as a rotation axis. Further, it is hinged to the balance bar 35 using a biaxial rotary joint 39.

  Even when the balance bar 35 rotates about the support shaft 38, the first bar side rod 30 is inclined and displaced with respect to the first balance piston 25, but the first piston with respect to the first balance piston 25. Since the side rod 28 is not displaced, the inside of the first balance cylinder 23 can be pushed without stress on the first balance piston 25.

  One end of the second balance push rod 31 is connected to the second piston side rod 32 for pushing the second balance piston 26 and the second piston side rod 32 so as to be swingable. It has the 2nd bar | burr side rod 34 which an other end connects to an engaging part. The second bar side rod 34 is hinged to the second piston side rod 32 using a uniaxial rotary joint 33 so that the second bar side rod 34 can rotate about one axis as a rotation axis. The second bar side rod 34 can be rotated with the second bar side rod 34 having one axis as a rotation axis, and the balance bar 35 can be rotated with the length direction of the balance bar 35 as a rotation axis. In addition, it is hinged to the balance bar 35 using a biaxial rotary joint 40.

  Even if the balance bar 35 rotates about the support shaft 38, the second bar side rod 34 is inclined and displaced with respect to the second balance piston 26, but the second piston with respect to the second balance piston 26. Since the side rod 32 is not displaced, the inside of the second balance cylinder 24 can be pushed without stress on the second balance piston 26.

  Since the multiple hydraulic pressure generating device 2 and the balance unit 3 are separated, the multiple hydraulic pressure generating device 2 can be connected to a brake pedal 20 that can be operated by a foot of a vehicle driver. The balance unit 3 can be arranged at the driver's hand. A lever 37 that can be manually operated by the driver is connected to the balance bar 35, and by rotating the lever 37, the balance bar 35 can be rotated with the length direction of the balance bar 35 as the rotation axis.

  A male screw 36 is cut in an intermediate portion of the balance bar 35, and the connection between the balance bar 35 and the support shaft 38 will be described in detail below.

  As shown in FIGS. 1 and 2A, the balance bar 35 is a normal line of a plane (corresponding to a plane parallel to the paper surface) including the axis of the first balance cylinder 23 and the axis of the second balance cylinder 24. As a rotation axis, the vehicle is rotatably supported by a vehicle chassis 22 by a rotatable bearing 42. According to this, so-called seesaw movement using the support shaft 38 of the balance bar 35 as a fulcrum can be easily realized, and the balance bar 35 can be supported around the support shaft 38 as a rotation center.

  The balance bar 35 is supported by the vehicle chassis 22 via a support shaft 38 and a bearing 42. The support shaft 38 is fixed to the bearing 42 and can be rotated together with the bearing 42.

  As shown in FIGS. 2A and 2B, the support shaft 38 is provided with a screw hole 41 through which an intermediate portion of the balance bar 35 is passed and screwed. When the driver rotates the lever 37 (see FIG. 1) and the middle portion of the balance bar 35 is screwed, the balance bar 35 can move in the length direction of the balance bar 35 with respect to the support shaft 38. As a result of this movement, the first distance L1 from the rotation center of the balance bar 35 to the first engagement portion shown in FIG. 1 and the second distance L2 from the rotation center of the balance bar 35 to the second engagement portion are shown. And the ratio can be changed. If the balance bar 35 is not screwed, the ratio between the first distance L1 and the second distance L2 can be kept constant.

  Next, the operation of the hydraulic pressure distribution ratio adjusting device 1 will be described.

  As shown in FIG. 3, first, when the brake pedal 20 is pressed, the second hydraulic pressure generating push rod 16 is pressed, the second hydraulic pressure generating piston 14 is pressed, and the second hydraulic pressure generating cylinder 12 is high. A hydraulic fluid having a hydraulic pressure is generated. Further, the first hydraulic pressure generating push rod 15 is pushed by the second hydraulic pressure generating piston 14, the first hydraulic pressure generating piston 13 is pushed, and the pressurized liquid having a high hydraulic pressure is generated in the first hydraulic pressure generating cylinder 11. appear.

  In the balance unit 3, a high hydraulic pressure Pf is generated in the first balance cylinder 23 through the first pressure-resistant tube 8 due to the generation of a high hydraulic pressure in the first hydraulic pressure generating cylinder 11, and the first balance piston 25 is The first engagement portion of the balance bar 35 is pushed through the first balance push rod 27.

  Similarly, due to the generation of a high hydraulic pressure in the second hydraulic pressure generating cylinder 12, a high hydraulic pressure Pr is generated in the second balance cylinder 24, and the second balance piston 26 is connected to the balance bar via the second balance push rod 31. Press the second engaging portion of 35.

  Since the balance bar 35 is rotatably supported by the support shaft 38 in the intermediate portion, it functions like a seesaw with the rotation center of the balance bar 35 as a fulcrum. As shown in FIG. 3, for example, the first distance L1 from the rotation center of the balance bar 35 to the first engagement portion is the first distance L1 from the rotation center (support shaft 38) of the balance bar 35 to the second engagement portion. It is assumed that the pressure is shorter than the two distances L2 (L1 <L2), and the same hydraulic pressure is generated in the first balance cylinder 23 and the second balance cylinder 24 (Pf = Pr). In such a setting, since the state of L1 × Pf <L2 × Pr is established, the second distance L2 side that hits the longer arm of the so-called seesaw wins and the pressure in the second balance cylinder 24 on the second distance L2 side is increased. The second balance piston 26 and the second balance push rod 31 move so that the volume of the liquid increases. However, since the volume increases due to this movement, the hydraulic pressure Pr of the pressurized liquid in the second balance cylinder 24 decreases. On the other hand, the first balance piston 25 and the first balance push rod 27 move so that the volume of the pressurized liquid in the first balance cylinder 23 on the first distance L1 side decreases, and the volume decreases due to this movement. The hydraulic pressure Pf of the hydraulic fluid in the first balance cylinder 23 increases. Due to the decrease in the hydraulic pressure Pr and the increase in the hydraulic pressure Pf, the second distance L2 side that hits the longer side of the seesaw arm does not continue to win and the balance of the seesaw after the decrease in the hydraulic pressure Pr and the increase in the hydraulic pressure Pf is reached. (L1 × Pf = L2 × Pr) is always obtained.

  According to the seesaw principle, the ratio (Pr / Pf) of the hydraulic fluid pressure Pr in the second balance cylinder 24 to the hydraulic fluid pressure Pf in the first balance cylinder 23 is the first distance relative to the second distance L2. The first balance piston 25, the first balance push rod 27, the second balance piston 26, and the second balance push rod 31 move until they match the ratio (L1 / L2) of L1 (Pr / Pf = L1 / L2). To do. With this movement, the balance bar 35 rotates, but rotates around one rotation axis that passes through the rotation center. Further, as the hydraulic pressure Pr of the hydraulic fluid in the second balance cylinder 24 decreases, the hydraulic fluid pressure in the rear wheel brake 5 and the second hydraulic pressure generator 7 also reaches a hydraulic pressure equal to the hydraulic pressure Pr. descend. Similarly, as the hydraulic fluid pressure Pf in the first balance cylinder 23 increases, the hydraulic fluid pressure in the front wheel brake 4 and the first hydraulic pressure generator 6 also reaches a hydraulic pressure equal to the hydraulic pressure Pf. To rise. Thus, the hydraulic pressure distribution ratio (Pr / Pf) can be set to the ratio (L1 / L2) between the first distance L1 and the second distance L2. Then, the length of the first distance L1 and the second distance L2 is changed by moving the position of the rotation center on the balance bar 35 (the position supported by the support shaft 38) by the lever 37, and the ratio ( L1 / L2) can be changed, and finally the hydraulic pressure distribution ratio (Pr / Pf) can be changed.

  That is, as shown in FIG. 4A, if the first distance L1 is shorter than the second distance L2 (L1 <L2), the second balance cylinder on the second distance L2 side is shown in FIG. 4B. The second balance piston 26 and the second balance push rod 31 move so that the volume of the pressurized fluid in the fluid 24 increases, and the fluid pressure Pr decreases. On the other hand, the first balance piston 25 and the first balance push rod 27 move so that the volume of the pressurized liquid in the first balance cylinder 23 on the first distance L1 side decreases, and the hydraulic pressure Pf increases. As a result, the hydraulic pressure Pf becomes larger than the hydraulic pressure Pr (Pf> Pr), and finally the seesaw can be balanced (L1 × Pf = L2 × Pr). Since the first balance cylinder 23 is connected to the front wheel brake 4 and the first hydraulic pressure generator 6 by the first pressure-resistant tube 8 (see FIG. 3), the first balance cylinder 23 is connected to the front wheel brake 4 and the first hydraulic pressure generator 6. The hydraulic pressure of the hydraulic fluid also rises to a hydraulic pressure equal to the hydraulic pressure Pf. Similarly, since the second balance cylinder 24 is connected to the rear wheel brake 5 and the second hydraulic pressure generator 7 by the second pressure-resistant tube 9 (see FIG. 3), the rear wheel brake 5 and the second hydraulic pressure are connected. The hydraulic pressure in the generator 7 is also reduced to a hydraulic pressure equal to the hydraulic pressure Pr. Thus, the hydraulic pressure of the front wheel brake 4 (corresponding to the hydraulic pressure Pf) can be set to be larger than the hydraulic pressure of the hydraulic pressure of the rear wheel brake 5 (corresponding to the hydraulic pressure Pr).

  As shown in FIG. 5A, if the first distance L1 is equal to the second distance L2 (L1 = L2), as shown in FIG. 5B, the hydraulic pressure Pr increases or decreases while being equal to the hydraulic pressure Pf. (Pf = Pr). Therefore, the seesaw can be balanced (L1 × Pf = L2 × Pr) without rotating the balance bar 35 (seesaw arm). The hydraulic pressure of the hydraulic fluid in the front wheel brake 4 and the first hydraulic pressure generator 6 is equal to the hydraulic pressure Pf. Similarly, the hydraulic fluid in the rear wheel brake 5 and the second hydraulic pressure generator 7 is the same. Since the pressure is also equal to the hydraulic pressure Pr, the hydraulic pressure of the front wheel brake 4 (corresponding to the hydraulic pressure Pf) is changed to the hydraulic pressure of the hydraulic pressure of the rear wheel brake 5 (corresponding to the hydraulic pressure Pr). Can be set to be equal.

  As shown in FIG. 6A, if the first distance L1 is longer than the second distance L2 (L1> L2), as shown in FIG. 6B, inside the first balance cylinder 23 on the first distance L1 side. The first balance piston 25 and the first balance push rod 27 move so that the volume of the pressurized fluid increases, and the fluid pressure Pf decreases. On the other hand, the second balance piston 26 and the second balance push rod 31 move so that the volume of the pressurized liquid in the second balance cylinder 24 on the second distance L2 side decreases, and the hydraulic pressure Pr increases. As a result, the hydraulic pressure Pf becomes smaller than the hydraulic pressure Pr (Pf <Pr), and finally the seesaw can be balanced (L1 × Pf = L2 × Pr). The hydraulic pressure of the hydraulic fluid in the front wheel brake 4 and the first hydraulic pressure generator 6 is equal to the hydraulic pressure Pf. Similarly, the hydraulic fluid in the rear wheel brake 5 and the second hydraulic pressure generator 7 is the same. Since the pressure is also equal to the hydraulic pressure Pr, the hydraulic pressure of the front wheel brake 4 (corresponding to the hydraulic pressure Pf) is changed to the hydraulic pressure of the hydraulic pressure of the rear wheel brake 5 (corresponding to the hydraulic pressure Pr). It can be set to be smaller.

(Second Embodiment)
FIG. 7A is a configuration diagram of a balance unit of the hydraulic pressure distribution ratio adjusting device according to the second embodiment of the present invention. The hydraulic pressure distribution ratio adjusting device of the second embodiment is different from the hydraulic pressure distribution ratio adjusting device 1 of the first embodiment only in the balance unit. Specifically, in the first embodiment, the first balance cylinder 23 and the second balance cylinder 24 are connected to the chassis 21 of the vehicle so that the shaft of the first balance cylinder 23 and the shaft of the second balance cylinder 24 do not move. It is fixed to. On the other hand, in the second embodiment, so that the axis of the first balance cylinder 23 can swing, the cylindrical sealed end of the first balance cylinder 23 can be rotated about one axis. A uniaxial rotary joint 43 is provided to fix the first balance cylinder 23 to the chassis 21. As a result, the first balance cylinder 23 is hinged to the chassis 21 of the vehicle. Similarly, in the second embodiment, the cylindrical balance end of the second balance cylinder 24 can be rotated about one axis so that the axis of the second balance cylinder 24 can swing. In addition, a uniaxial rotary joint 44 is provided to fix the second balance cylinder 24 to the chassis 21. As a result, the second balance cylinder 24 is hinged to the chassis 21 of the vehicle.

  According to these things, the 1st balance push rod 27 is shown in FIG.7 (b), without dividing | segmenting into the 1st piston side rod 28 and the 1st bar side rod 30 like 1st Embodiment. As described above, even if the balance bar 35 rotates, the shaft of the first balance cylinder 23 swings, and the first balance cylinder 25 can be pushed in the first balance cylinder 25 without stress. Similarly, even if the balance bar 35 rotates without dividing the second balance push rod 31 into the second piston side rod 32 and the second bar side rod 34 as in the first embodiment, The shaft of the two balance cylinders 24 can swing, and the second balance piston 26 can be pushed in the second balance cylinder 24 without stress.

1 is a configuration diagram of a hydraulic pressure distribution ratio adjusting device according to a first embodiment of the present invention. (A) is sectional drawing of the AA direction of FIG. 1, (b) is sectional drawing of the BB direction of (a). The figure for demonstrating the state of a hydraulic pressure distribution ratio adjustment apparatus when a brake operation is performed and a hydraulic fluid generate | occur | produces in a 1st hydraulic pressure generator and a 2nd hydraulic pressure generator (the rotation center of a balance bar) The first distance from the first engagement portion to the first engagement portion is shorter than the second distance from the rotation center of the balance bar to the second engagement portion). It is a figure which shows the state of a balance unit in case the 1st distance from the rotation center of a balance bar to a 1st engagement part is shorter than the 2nd distance from the rotation center of a balance bar to a 2nd engagement part, (A) shows the state of the balance unit before pressure fluid is generated in the first balance cylinder and the second balance cylinder, and (b) pressure fluid is generated in the first balance cylinder and the second balance cylinder. This shows the status of the balance unit when It is a figure which shows the state of a balance unit in case the 1st distance from the rotation center of a balance bar to a 1st engagement part is equal to the 2nd distance from the rotation center of a balance bar to a 2nd engagement part, (A) shows the state of the balance unit before pressure fluid is generated in the first balance cylinder and the second balance cylinder, and (b) pressure fluid is generated in the first balance cylinder and the second balance cylinder. This shows the status of the balance unit when It is a figure which shows the state of a balance unit in case the 1st distance from the rotation center of a balance bar to a 1st engaging part is longer than the 2nd distance from the rotation center of a balance bar to a 2nd engaging part, (A) shows the state of the balance unit before pressure fluid is generated in the first balance cylinder and the second balance cylinder, and (b) pressure fluid is generated in the first balance cylinder and the second balance cylinder. This shows the status of the balance unit when The block diagram of the balance unit of the hydraulic distribution ratio adjustment device concerning a 2nd embodiment of the present invention (the 1st distance from the rotation center of a balance bar to the 1st engagement part is the first from the rotation center of a balance bar. (A) is shorter than the second distance to the engaging portion), (a) shows the state of the balance unit before pressure fluid is generated in the first balance cylinder and the second balance cylinder, (b) The state of the balance unit when pressure fluid is generated in the first balance cylinder and the second balance cylinder is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic distribution ratio adjustment apparatus 2 Multiple hydraulic pressure generator 3 Balance unit 4 Front wheel brake 5 Rear wheel brake 6 1st hydraulic pressure generator 7 2nd hydraulic pressure generator 8 1st pressure | voltage resistant tube 9 2nd pressure | voltage resistant tube 11 1st Hydraulic pressure generating cylinder 12 Second hydraulic pressure generating cylinder 13 First hydraulic pressure generating piston 14 Second hydraulic pressure generating piston 15 First hydraulic pressure generating push rod 16 Second hydraulic pressure generating push rod 17, 18, 19 Uniaxial rotary joint DESCRIPTION OF SYMBOLS 20 Brake pedal 21, 22 Chassis 23 1st balance cylinder 24 2nd balance cylinder 25 1st balance piston 26 2nd balance piston 27 1st balance push rod 28 1st piston side rod 29 1 axis | shaft rotation joint 30 1st bar side rod 31 2nd balance push rod 32 2nd piston side rod 3 1 pivot joint 34 second bar side rod 35 balance bar 36 external thread 37 rotates the lever 38 supporting the shaft 39, 40 two-axis rotary joint 41 screw hole 42 bearing 43, 44 1 pivot joint

Claims (2)

A first hydraulic pressure generator connected to the front wheel brake and outputting a hydraulic pressure according to the brake operation;
A second hydraulic pressure generator connected to a rear wheel brake and outputting a hydraulic pressure corresponding to the brake operation simultaneously with the first hydraulic pressure generator;
A first balance cylinder connected to the front wheel brake and the first hydraulic pressure generator;
A second balance cylinder provided in parallel to the first balance cylinder and connected to the rear wheel brake and the second hydraulic pressure generator;
A first balance piston inserted into the first balance cylinder;
A second balance piston inserted into the second balance cylinder;
A first balance push rod that pushes against the first balance piston;
A second balance push rod that pushes against the second balance piston;
The first engagement portion engages with the first balance push rod, the second engagement portion engages with the second balance push rod, and between the first engagement portion and the second engagement portion. A balance bar that is rotatably supported in the middle part,
The ratio between the first distance from the rotation center of the balance bar to the first engagement portion and the second distance from the rotation center of the balance bar to the second engagement portion can be changed. A hydraulic pressure distribution ratio adjusting device. The first hydraulic pressure generator includes:
A first hydraulic pressure generating cylinder connected to the front wheel brake;
A first hydraulic pressure generating piston inserted in the first hydraulic pressure generating cylinder and pushed by the brake operation;
The second hydraulic pressure generator is
A second hydraulic pressure generating cylinder integrated with the first hydraulic pressure generating cylinder and connected to the rear wheel brake;
A second hydraulic pressure generating piston that is integrated with the first hydraulic pressure generating piston, is inserted into the second hydraulic pressure generating cylinder, and is pushed simultaneously with the first hydraulic pressure generating piston by the brake operation; The hydraulic pressure distribution ratio adjusting device according to claim 1.

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