DE112021002966T5 - Accumulator of a brake fluid pressure control device for a vehicle - Google Patents

Abstract

A brake liquid pressure control device for a vehicle is provided which can freely control the urging force of a piston acting on the hydraulic space side of an accumulator. The accumulator of the brake fluid pressure control device for a vehicle according to the present invention is provided with a bottomed cylinder hole (120) which is formed in a main body (51) of a brake fluid pressure control device (50) for a vehicle and into which a communication passage of the brake fluid opens out, a plug (130, 230) which closes the opening of the cylinder hole (120), a piston (110, 310) which is slidably provided in the cylinder hole (120) in its axis direction (1203) and the cylinder hole (120) into a hydraulic space on the side facing the connection channel and a gas space on the side facing the plug, a magnetic body (115, 315) which is arranged on the piston (110, 310) and can be displaced together with the piston (110, 310). is, a coil (135, 235) which is arranged in a space formed by the cylinder hole (120) and the plug (130, 230), and by energizing a Magnetf field is generated, and a power supply part (136, 236) which is connected to the coil (135, 235) and supplies the coil (135, 235) with power.

Description

[Technical Field]

The present invention relates to a brake fluid pressure control device, more particularly to a brake fluid pressure control device for a vehicle having a regenerative cooperative brake control function installed, which is used for a hybrid automobile or an electric automobile.

[State of the art]

Conventionally, the technique disclosed in Patent Document 1 is known as a structure of an accumulator in which the brake fluid for releasing the brake fluid pressure of a wheel cylinder is temporarily stored. The accumulator disclosed in Patent Document 1 is, in its bottomed cylinder hole provided in a body, with a piston that slides in the axis direction of the cylinder hole and separates the hydraulic space and the gas space from each other, a spring that pushes the piston to the hydraulic space side towards, and provided with a closing cap, which is provided at the opening of the cylinder hole.

Patent Document 2 further discloses an accumulator having a structure in which a piston is biased toward the hydraulic chamber side using the repulsive force of a magnet.

[Prior Art Documents]

[patent documents]

• [Patent Document 1] JP 2017-001483 A
• [Patent Document 2] US 2012/0326495 A

[Summary of the Invention]

[Object to be solved by the invention]

In the anti-lock brake control, control is performed such that a release valve is opened and brake fluid flows into an accumulator to release brake fluid pressure of a wheel cylinder and prevent wheel locking. At this time, the urging force with which a piston is urged by a spring toward the hydraulic chamber side of the accumulator has prevented the brake fluid from rapidly flowing into the accumulator. Further, in a brake fluid pressure control device for a vehicle having a regenerative cooperative brake control function installed, which is used for a hybrid automobile or an electric automobile, it is necessary to release the brake fluid pressure of a wheel cylinder depending on the magnitude of a regenerative braking torque generated from power generation a rotary resistance of an electric motor. However, when this pressure reduction control is performed by opening a release valve of the brake fluid pressure control device, a wheel cylinder and an accumulator communicate with each other. Therefore, in an accumulator having a structure in which a piston is always urged toward the hydraulic chamber side, excess fluid pressure is applied to a wheel cylinder.

The object of the present invention is to provide a brake fluid pressure control device for a vehicle which can achieve the above-mentioned object possessed by the conventional art and can freely control the urging force of a piston acting on the hydraulic space side of an accumulator.

[means for solving the task]

The present invention is an accumulator of a brake fluid pressure control device for a vehicle, which is used in a brake fluid pressure control device for a vehicle and has a hydraulic space for temporarily storing the brake fluid, provided with: a bottomed cylinder hole in which the brake fluid pressure is formed in a main body - control device for a vehicle is formed and into which a connection channel of the brake fluid opens; a plug that closes the opening of the cylinder hole; a piston that is slidably provided in the cylinder hole in its axis direction and divides the cylinder hole into a hydraulic space on the side facing the connection passage and a gas space on the side facing the plug; a magnetic body that is placed on the plunger and is slidable together with the plunger; a coil that is placed in a space formed by the cylinder hole and the plug and generates a magnetic field by energization; and a power supply part that is connected to the coil and supplies power to the coil.

In this case, the plunger may be provided with a magnetic body holding part which holds the magnetic body.

In this case, the plunger can be formed integrally with the magnetic body.

In this case, the coil can be arranged at a position opposite to the plunger on the bottom surface of the plug.

In this case, the spool can be arranged so as to enclose the piston when viewed from an axial direction of the cylinder hole.

In this case, a cover can be provided that covers the connector from the outside of the base body.

In this case, the cover can be formed integrally with an ECU case accommodating a controller of the brake fluid pressure control device for a vehicle.

In this case, an orifice leading to the atmosphere may be formed in the plug.

[Advantages of the invention]

In the present invention, the urging force acting on a piston of an accumulator can be adjusted electrically. Therefore, the piston can be given an appropriate biasing force depending on the operation of the brake controller.

character list

• [ 1 ] is a circuit diagram showing a hydraulic circuit for a brake according to the embodiment of the present invention.
• [ 2 ] is a sectional view of a secondary battery according to the first embodiment of the present invention.
• [ 3 ] is a sectional view of a secondary battery according to the second embodiment of the present invention.
• [ 4 ] is a sectional view of a secondary battery according to the third embodiment of the present invention.
• [ 5 ] is a sectional view of a brake liquid pressure control device according to the embodiment of the present invention.

[Embodiments of the invention]

In the following, the brake liquid pressure control device according to the present invention will be explained with reference to the drawings. The following will explain the case where the brake system including the brake fluid pressure control device according to the present invention is installed in a four-wheel vehicle. However, the brake system including the liquid pressure control device according to the present invention can be installed in other vehicles (two-wheeled vehicle, truck, bus, etc.) besides four-wheel vehicles. The construction, operation, etc. explained below are given as examples. The brake system including the fluid pressure control device according to the present invention is not limited to such construction, operation, etc. In the individual figures, identical or similar elements or parts are marked with the same reference symbols or there is no marking with reference symbols. Construction details are simplified or omitted according to the circumstances.

A brake system 1 according to the present embodiment will be explained below.

Construction and operation of the brake system 1 according to the present embodiment will be explained. 1 12 is a diagram showing an exemplary system construction of the braking system according to the embodiment of the present invention.

As in 1 shown, the braking system 1 is installed in a vehicle 10 and comprises a hydraulic circuit 2 having a main duct 13 connecting a master cylinder 11 to a wheel cylinder 12, a secondary duct 14 releasing the brake fluid of the main duct 13, and a supply duct 15. which supplies the secondary channel 14 with the brake fluid. Hydraulic circuit 2 is filled with brake fluid. The brake system 1 according to the present embodiment is provided with two hydraulic circuits 2a, 2b as the hydraulic circuits 2. As shown in FIG. The hydraulic circuit 2a is a hydraulic circuit in which, through the main passage 13, the master cylinder 11 is connected to the wheel cylinders 12 on wheels RL, FR. The hydraulic circuit 2b is a hydraulic circuit in which, through the main passage 13, the master cylinder 11 is connected to the wheel cylinders 12 on wheels FL, RR. These hydraulic circuits 2a, 2b have the same construction except that they are connected to different wheel cylinders 12.

A piston (not shown) is installed in the master cylinder 11 and is reciprocated in cooperation with a brake pedal 16 which is an example of the input part of the brake system 1 . Between the brake pedal 16 and the piston of the master cylinder 11 is a booster 17 through which the user's foot force is boosted and transmitted to the piston. The booster 17 may be a vacuum booster using the engine vacuum or an electric brake booster which controls the liquid pressure by reciprocating the piston of the master cylinder 11 with the driving force of the motor. The wheel cylinder 12 is provided in a brake caliper 18 . If the liquid pressure of the brake fluid is built up in the wheel cylinder 12, a brake pad 19 of the brake caliper 18 is pressed against a rotor 20 and the wheels are braked.

The end on the upstream side in the branch duct 14 is connected to a branch 13a in the main duct 13 . The end on the downstream side in the sub duct 14 is connected to a branch 13 b in the main duct 13 . Further, the end on the upstream side in the supply passage 15 communicates with the master cylinder 11 . The end on the downstream side in the supply duct 15 is connected to a branch 14a in the sub duct 14 . The “upstream side” in the sub passage 14 refers to the upstream side in the flow of brake fluid returning from the wheel cylinder to the master cylinder when a pump 41 is driven by rotation of a motor 40 . The "downstream side" refers to the downstream side in the flow of this brake fluid.

In an area between the branch 13b and the branch 13a of the main passage 13 (in an area located on the wheel cylinder 12 side with respect to the branch 13b), a charging valve (EV) 31 is provided. A release valve (AV) 32 is provided in an area between the branch 13a and the branch 14a of the secondary channel 14 . An accumulator 100 is provided in an area between the release valve 32 and the branch 14a of the secondary channel 14 . The charging valve 31 is z. B. a solenoid valve that opens when de-energized and closes when energized. The release valve 32 is z. B. a solenoid valve that closes when de-energized and opens when energized.

In an area between the branch 14a and the branch 13b of the secondary channel 14, the pump 41 is also provided. The suction side of the pump 41 is connected to the branch 14a. The pressure side of the pump 41 is connected to the branch 13a of the secondary channel 14. More specifically, the brake system 1 is provided with a suction passage 142 and a pressure passage 140 as a construction of a brake liquid pressure control device 50, which constitute a part of the sub-passage 14. As shown in FIG. The suction channel 142 constructs a flow channel between the branch 13a of the branch duct 14 and the suction side of the pump 41. The pressure channel 140 constructs a flow channel between the pressure side of the pump 41 and the branch 13b of the branch duct 14.

The brake fluid pressure control device 50 is provided with a damper 80 that dampens pulsation of a brake fluid forced into the pressure passage 140 by the pump 41 . More specifically, the pressure side of the pump 41 is connected to an inflow opening (not shown) of the damper 80 into which the brake fluid flows. In addition, an outflow opening (not shown) from which the brake fluid temporarily stored in the damper 80 flows out is connected to the branch 13b of the auxiliary channel.

A first switching valve (USV) 35 is provided in a region of the main channel 13 which, in relation to the branch 13b, is on the side facing the master cylinder 11 . A second switching valve (HSV) 36 is provided in the supply channel 15 . The first switching valve 35 is z. B. a solenoid valve that opens when de-energized and closes when energized. The second switching valve 36 is z. B. a solenoid valve that closes when de-energized and opens when energized.

The charging valve 31, the release valve 32, the accumulator 100, the pump 41, the first switching valve 35, the second switching valve 36 and the damper 80 are provided in a main body 51 in which a flow passage for constructing the main passage 13, the sub passage 14 and of the supply channel 15 is formed. The respective elements (the charging valve 31, the release valve 32, the accumulator 100, the pump 41, the first switching valve 35, the second switching valve 36 and the damper 80) can be provided together in one base body 51 or separately in a plurality of base bodies 51.

The brake fluid pressure control device 50 is constructed of at least the main body 51 , respective members provided in the main body 51 , and a control unit (ECU) 52 . In the brake fluid pressure control device 50, the operation of the charging valve 31, the release valve 32, the accumulator 100, the pump 41, the first switching valve 35 and the second switching valve 36 is controlled by the controller 52 so that the fluid pressure of the brake fluid in the wheel cylinder 12 is controlled . In fact, the control unit 52 manages the operation of the loading valve 31, the release valve 32, the accumulator 100, the pump 41, the first switching valve 35 and the second switching valve 36.

One control unit 52 or several separate control units 52 can be provided. The control unit 52 can also be attached to the base body 51 or to other elements. The controller 52 can also be partially or fully z. B. from microcomputers, microprocessor units o. Ä. constructed from an updatable object such as firmware or the like. be constructed and also a program module or similar. be caused by commands from the CPU or similar. is performed.

The operation of the ABS control performed by the controller 52 will be explained below. In the normal braking mode, in which the charge valve 31 is opened, the release valve 32 is closed, the first switching valve 35 is opened and the second switching valve 36 is closed, the fluid pressure generated in the master cylinder in response to the driver's stroke of the brake pedal is reduced to the Transfer wheel cylinder. When the brake pedal 16 of the vehicle 10 is operated, when a locking tendency of the wheels is detected from a detection signal of a wheel speed sensor (not shown) and a detection signal of a fluid pressure sensor in the hydraulic circuit 2, the controller 52 starts ABS control operation.

During operation of the ABS control, the control unit 52 closes the charging valve 31 so that the flow of brake fluid from the master cylinder 11 to the wheel cylinder 12 is restricted. Furthermore, the control unit 52 opens the release valve 32 so that the brake fluid is allowed to flow from the wheel cylinder 12 to the accumulator 100 . Further, the controller 52 keeps the first switching valve 35 in an open state and the second switching valve 36 in a closed state, so that the brake fluid stored in the accumulator 100 is allowed to flow back to the master cylinder 11 via the pump 41 . Further, the controller 52 controls the opening and closing of the charge valve 31 and the release valve 32 according to circumstances, thereby controlling the liquid pressure in the wheel cylinder so that the wheels are not locked.

When the release valve 32 is opened here, the brake fluid flows from the wheel cylinder 12 into the accumulator 100 . However, in the construction in which, as in a conventional accumulator, a piston is always acted upon towards the hydraulic chamber side, this actuation force was an obstacle to the inflow of the brake fluid into accumulator 100.

Next, the operation of the liquid pressure control by the controller 52 in the regenerative cooperative braking control operation will be explained. In the regenerative cooperative braking control, braking force for a vehicle is provided by both hydraulic braking torque generated by a brake liquid pressure controller and regenerative braking torque generated by an electric machine. In a state where the braking force for a vehicle can be compensated for by regenerative braking torque, the controller 52 opens the release valve 32 and allows the brake fluid to flow from the wheel cylinder 12 to the accumulator 100 to relieve the braking force of the vehicle by hydraulic braking torque to reduce.

In this state, a state in which the wheel cylinder 12 and the accumulator 100 are hydraulically connected to each other is maintained. Therefore, in the structure in which a piston is always urged toward the hydraulic chamber side like a conventional accumulator, the fluid pressure generated by this urging force is transmitted to the wheel cylinder, and the hydraulic braking torque in the wheel cylinder is increased by this urging force. Therefore, an accumulator has been desired which has a structure in which the urging force of a piston which is urged toward the hydraulic space side of an accumulator can be adjusted according to the circumstances depending on the brake control operating state.

2 12 is a diagram showing the structure of the accumulator 100 of the brake liquid pressure control device 50 according to the first embodiment of the present invention.

The accumulator 100 is provided with a cylinder hole 120 which is formed in the main body 51 of the brake fluid pressure control device, a piston 110 which is arranged in the cylinder hole 120 and is slidable in an axis direction 120a of the cylinder hole 120, and a plug 130 which has the opening of the cylinder hole 120 is closed.

The cylinder hole 120 is a substantially cylindrical bottomed hole formed by subjecting the base body 51 made of metal such as aluminum etc. to cutting work. A connecting channel leading to the suction channel 142 of the secondary channel 14 opens into the bottom part (top part in the figure) of the cylinder hole.

The piston 110 has a piston surface 111 which receives the brake fluid flowing in from the sub-passage 14, and a guide wall 112 which guides the movement when the piston 110 is displaced in the axis direction 120a of the cylinder hole 120. Further, an annular sealing member 114 is disposed in an annular groove 113 formed in the outer peripheral surface of the baffle 112 . The annular sealing member 114, which is arranged between the inner peripheral part of the cylinder hole 120 and the outer peripheral part of the piston 110, has a function of sliding on the inner peripheral surface of the cylinder hole 120 and preventing the brake fluid from leaking into a gas space 122, which is a space is formed by the piston 110 and the plug 130.

Further, a magnetic body 115 is installed on the plunger 110 so as to be slidable together with the plunger 110 . The magnetic body, which is a permanent magnet having N and S poles, is attached to the piston such that the N and S poles line up in the axis direction of the cylinder hole. The piston 110 has a magnetic body retaining portion 116 which is annularly suspended from the piston face radially inward of the baffle 112 . By the magnetic body holding part 116, the magnetic body 115 is held.

The plug 130 is provided with a hollow bottomed cup part 131 and a sealing part 132 to be fitted into the base body 51 . A coil 135 is also arranged on the inner bottom part of the plug 130 . At the bottom part of the connector 130, a power supply part 136 for supplying power to the coil 135 is integrally formed with the connector 130. As shown in FIG. The power supply part 136 is erected from outside to inside of the connector 130 in parallel to the axis direction 120a, and its position erected at the outer part of the connector 130 is electrically connected to the controller 52 . The plug 130 is caulked in a state where the sealing part 132 fits an annular groove 121 formed in the opening part of the cylinder hole 120 . Thus, the plug 130 is coupled to the base body 51 .

When the power supply part 136 is energized from the controller 52, the coil 135 is energized and the coil 135 functions as an electromagnet. The direction of the current flowing through the coil 135 is controlled by the controller 52, whereby the direction of the generated magnetic pole can be changed and the direction of the magnetic force applied to the magnetic body 115 of the plunger 110 can be controlled. Further, the magnitude of the current flowing through the coil 135 is controlled by the controller 52, whereby the magnitude of the magnetic force given to the magnetic body 115 can be adjusted. Therefore, the magnetic force applied to the magnetic body 115, namely, the urging force of the plunger 110 can be freely controlled.

if e.g. For example, when the controller 52 performs the ABS control operation, the controller 52 may control the current flowing through the coil such that the piston 110 descends simultaneously with or just prior to the release valve 32 opening. In this way, the brake fluid flowing into the accumulator 100 from the wheel cylinder 12 can be introduced into the accumulator 100 without being loaded. In 2 the S-pole of the magnetic body 115 of the coil 135 is arranged opposite. Therefore, the controller 52 can control the direction of the current flowing through the coil 135 such that the N pole is generated above the coil 135 and the magnetic force that attracts the magnetic body 115 downward is generated.

When the controller 52 performs the operation of the regenerative cooperative control, the controller 52 may also perform control such that the biasing force on the piston 110 is large at the time the release valve 32 opens, and the biasing force on the piston 110 is corresponding to the subsequent inflow of the Brake fluid in the accumulator 100 is gradually reduced. In this way, the occurrence of extraneous noise generated when the release valve 32 opens due to the pressure difference between the upstream side and the downstream side of the release valve 32 can be prevented, and at the same time the influence that the urging force of the piston 110 of the accumulator 100 at of the regenerative cooperative braking control exerts on the liquid pressure of the wheel cylinder 12 can be reduced.

3 12 is a diagram showing the structure of an accumulator 200 of the brake liquid pressure control device 50 according to the second embodiment of the present invention. The explanation of parts that are identical to the secondary battery 100 according to the first embodiment will be omitted or simplified.

The accumulator 200 has in common with the accumulator 100 according to the first embodiment that it has the piston 110 in the cylinder hole 120 which is displaced together with the magnetic body 115 . In the accumulator 200 of 3 For example, a plug 230 closing the cylinder hole 120 is formed in a bottomed tube shape, and a coil 235 is formed integrally with a side wall 231 of the plug 230. As shown in FIG. The piston 110 can be slid relative to the side wall 231 of the plug 230 .

Namely, in the secondary battery 200 according to the second embodiment, the plug 230 can be fitted into the cylinder hole 120 in a state where the piston 110 including the magnetic body 115 is previously accommodated in the plug 230 . The coil 235 is formed integrally with the side wall 231 of the plug 230, which is formed into an annular shape. The spool 235 is arranged so as to enclose the piston 110 when viewed from the axial direction 120a of the cylinder hole 120 . Further, it is desirable that the spool 235 is positioned near the center portion in the axis direction 120a of the cylinder hole 120 (depth direction of the hole). In 3 is the Diameter of a bottom surface 232 of the plug 230, which is in the form of a bottomed tube, is formed larger than that of the side wall. The plug 230 is caulked in a state where the enlarged diameter part of the annular groove 121 formed in the opening of the cylinder hole 120 fits. Thus, the plug 230 is coupled to the base body 51 .

A power supply part 236, which is connected to the controller 52 and through which the coil 235 is energized, is formed on the outer part of the bottom surface 232 of the connector 230. FIG. The power supply part 236 is electrically connected to the coil 235 .

Also formed in the bottom surface 232 of the plug 230 is a throttle opening 232a through which the gas space 122 leads to the atmosphere. Thereby, the urging force applied to the hydraulic space side of the piston 110 can be suppressed from being increased by the air spring action of the gas space 122 formed by the piston 110 and the plug 230. A filter 232b may be further provided at the orifice 232a so that foreign substances from the outside do not enter. A glass filter or PTFE filter can be selected as the filter 232b, which can realize that air is passed without letting large particles such as dust pass. In the secondary battery 200 according to the second embodiment, the coil 235 can be placed close to the magnetic body 115 . Therefore, a larger magnetic force can be generated with a smaller current. This enables control of the urging force applied to the piston to be performed more efficiently.

4 14 is a diagram showing the structure of an accumulator 300 of the brake liquid pressure control device 50 according to the third embodiment of the present invention. The explanation of parts that are identical to the secondary battery 100 according to the first embodiment and the secondary battery 200 according to the second embodiment will be omitted or simplified.

in the accumulator 4 a magnetic body 315 is formed integrally with a plunger 310 . For example, the magnetic body 315 polarized into N and S poles may be previously formed, and thereafter the plunger 310 integrally formed with the magnetic body 315 by integral molding using a resin, etc. may be formed .

Also formed on the side surface of the piston 310 is an annular groove 313 into which an annular sealing member 314 is inserted.

In the secondary battery 300 according to the third embodiment, the magnetic body 315 is formed integrally with the plunger 310 . Therefore, it is no longer necessary that a structure for supporting the magnetic body on the plunger is specially provided. Therefore, the manufacturing process of the secondary battery 300 can be simplified.

5 13 is a side view of the brake fluid pressure control device 50 in which the accumulator of the present invention is installed, or otherwise a schematic diagram showing the connection state between the controller 52 and the power supply part 136 of the accumulator 100. FIG.

The brake fluid pressure control device 50 comprises the main body 51 in which a hydraulic circuit is housed, the motor 40 for driving the pump 41, an ECU case 53 in which the controller 52 for controlling electronic control valves, the motor 40, etc. is installed , an ECU cover 54 for protecting the controller 52, and a cover 55 for protecting a connecting bolt 90 electrically connecting the power supply part of the secondary battery 100 to the controller 52. FIG.

The controller 52 is held by a holding member (not shown) provided inside the ECU case 53 . The opening of the ECU case 53 is closed by the ECU cover 54, thereby protecting the controller in the ECU case 53 from the external environment.

The power supply part 136 of the secondary battery 100 is formed outside the bottom surface of the plug 130 closing the cylinder hole 120 bored in the bottom surface of the base body 51 . Therefore, the power supply part 136 is located in the in 5 shown positional relationship to controller 52.

5 14 shows one embodiment of the construction of the connecting bolt 90 for supplying the power supply part 136 with power controlled by the controller 52. FIG.

The connecting bolt 90, which is formed of metal such as phosphor bronze, etc., is connected to the controller 52 at one end and to the power supply part 136 at the other end. The connecting bolt 90 and the controller 52 can be connected to one another by press fitting, soldering, etc. The connecting bolt 90 and the power supply part 136 can be connected to each other by soldering or welding.

The connecting bolt 90 whose intermediate point is subjected to bending is partially exposed outside of the ECU case 53 and is connected to the power supply part 136 . The cover 55 is provided to protect this connecting bolt 90 exposed to the outside. The cover 55, which is a resin molding, may be constructed separately from the ECU case 53 or may be formed integrally with the ECU case 53. The ECU case 53 and the cover 55 are formed integrally with each other, whereby the assembling process of the brake fluid pressure control device can be simplified.

In 5 the connecting bolt 90 is bent downward in front of the surface of the main body 51 facing the ECU case 53 . However, the connecting bolt 90 is not limited to this shape. The connecting bolt 90 can be bent down at a point in the base body 51 in front of the accumulator 100 . In this case, it is necessary for the main body 51 to be processed to ensure a route for guiding the connecting bolt 90 to the power supply part 136 . In order to power two power supplies 136, two connecting bolts 90 are also required. In this case, one connecting bolt and the other connecting bolt can be arranged in parallel and connected to two power supply parts 136 .

The accumulator of the liquid pressure control device according to the present invention and its peripheral constructions and functions have been explained above. However, the present invention is not limited to the illustrated forms of the respective embodiments. For example, the throttle opening 232a and the filter 232b, respectively, which are located on the bottom surface of the plug 230 in the in 3 specified accumulator 200 were provided according to the second embodiment, on the in 2 Accumulator 100 shown according to the first embodiment or in 4 shown accumulator 300 can be applied according to the third embodiment. Further, although the plunger 310 integrally formed with the magnetic body 315 of FIG 4 shown battery according to the third embodiment is applied to the battery 200 according to the second embodiment, similar actions and effects can be obtained.

reference list

1

brake system,

2

hydraulic circuit,

11

master cylinder,

12

wheel cylinder,

13

main channel,

14

side channel,

40

Engine,

41

Pump,

50

brake fluid pressure control device,

51

body,

52

control unit,

53

ecu housing,

54

ecu coverage,

55

Cover,

90

connecting bolt,

100

Accumulator,

110

Pistons,

111

piston area,

112

baffle,

113

annular groove,

114

annular sealing element,

115

magnetic body,

116

the magnetic body holding part,

120

cylinder hole,

120a

axis direction,

121

annular groove,

130

Plug,

131

cup part,

132

sealing part,

135

Kitchen sink,

136

power supply part,

140

pressure channel,

142

suction channel,

200

Accumulator,

230

Plug,

231

Side wall,

232

floor space,

232a

throttle opening,

232b

Filter,

235

Kitchen sink,

236

power supply part,

300

Accumulator,

310

Pistons,

313

annular groove,

315

magnetic body

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• JP 2017001483 A [0003]
• US20120326495A [0003]

Claims (8)

Accumulator (100, 200, 300) of a brake fluid pressure control device for a vehicle, which is used in a brake fluid pressure control device (50) for a vehicle and has a hydraulic chamber for temporarily storing the brake fluid, provided with a bottomed cylinder hole (120) which is formed in a main body (51) of the brake fluid pressure control device (50) for a vehicle and into which a communication passage of the brake fluid opens, a plug (130, 230) closing the opening of the cylinder hole (120), a piston (110, 310) which is slidably provided in an axis direction (120a) of the cylinder hole (120) and divides the cylinder hole (120) into a hydraulic space on the side facing the connection passage and a gas space on the side facing the connector, a magnetic body (115, 315) which is arranged on the piston (110, 310) and can be displaced together with the piston (110, 310), a coil (135, 235) which is placed in a space formed by the cylinder hole (120) and the plug (130, 230) and generates a magnetic field by energization, and a power supply (136, 236) which is connected to the coil (135, 235) and supplies the coil (135, 235) with power. Accumulator of a brake fluid pressure control device for a vehicle claim 1 wherein the plunger (110) is provided with a magnetic body holding part which holds the magnetic body. Accumulator of a brake fluid pressure control device for a vehicle claim 1 , wherein the plunger (310) is formed integrally with the magnetic body. Accumulator of a brake fluid pressure control device for a vehicle according to any one of Claims 1 until 3 wherein the coil (135) is arranged at a position opposite to the plunger (110, 310) on the bottom surface of the plug (130). Accumulator of a brake fluid pressure control device for a vehicle according to any one of Claims 1 until 3 wherein the spool (235) is arranged so as to enclose the piston when viewed from the axial direction (120a) of the cylinder hole (120). Accumulator of a brake fluid pressure control device for a vehicle according to any one of Claims 1 until 5 , provided with a cover (55) covering the plug (130, 230) from the outside of the base body (51). Accumulator of a brake fluid pressure control device for a vehicle claim 6 wherein the cover (55) is formed integrally with an ECU case (53) accommodating a controller (52) of the brake fluid pressure control device for a vehicle. Accumulator of a brake fluid pressure control device for a vehicle according to any one of Claims 1 until 7 wherein an orifice (232a) leading to the atmosphere is formed in the plug (130, 230).

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