JP2022058138A - Solenoid valve and brake control device - Google Patents

Abstract

To provide a solenoid valve and a brake control device, capable of suppressing increase of a pressure in a housing chamber.SOLUTION: A solenoid valve 21 includes: a housing 31 which is provided with a first flow channel 81, a housing chamber 82 separated from the first flow channel, a second flow channel 85 positioned between the first flow channel and the housing chamber, and an insertion hole 70 and a first circulation flow channel 75 for causing the second flow channel to communicate with the housing chamber, and which housing has a seat 43; a coil 34; a plunger 32 which is provided with a second circulation flow channel 95 for causing a first end surface 91 to communicate with a second end surface 92, and which plunger is energized by magnetic field of the coil; a valve member 33 which is positioned between the seat and the plunger inside of the housing, closing the first flow channel by passing through the insertion hole to contact with the seat, or causing the first flow channel to communicate with the second flow channel by being separated from the seat, and which valve member is energized by the plunger energized by the magnetic field; and an energization member 35 for energizing the valve member.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to solenoid valves and brake control devices.

In a conventional solenoid valve, the magnetic field generated by the energized coil attracts the plunger. Displacement of the suctioned plunger and the valve member causes the valve member to close the flow path (Patent Document 1).

The attractive force generated by the magnetic field urges the plunger in the direction of closing the flow path, while the reaction force generated by the brake fluid or spring flowing in the flow path urges the valve member in the direction of opening the flow path. The valve member moves to a position where the suction force and the reaction force are balanced. Therefore, the solenoid valve adjusts the degree of opening of the flow path according to the current flowing through the coil.

Special Table 2013-515217 Publication No.

However, in the conventional configuration, the flow path blocked by the valve member and the insertion hole through which the valve member is inserted face each other. Further, the insertion hole and the accommodation room in which the plunger is accommodated communicate with each other. Therefore, the brake fluid flowing through the flow path may flow through the valve member, pass through the insertion hole, and flow into the accommodation chamber. The brake fluid that has flowed into the accommodation chamber may increase the pressure in the accommodation chamber, thereby urging the valve member in the direction of closing the flow path.

Therefore, the present invention has been made in view of the above, and provides an electromagnetic valve and a brake control device capable of suppressing an increase in pressure in a storage chamber.

As an example, the solenoid valve according to the embodiment of the present invention includes a first flow path, a storage chamber separated from the first flow path in the first direction, and the first flow path and the storage chamber. A second flow path that is located between the above and can communicate with the first flow path, an insertion hole that communicates between the second flow path and the accommodation chamber, and a second flow path that is separated from the insertion hole and that can communicate with the first flow path. A housing having a sheet provided with a first circulation flow path communicating the second flow path and the accommodation chamber and having the first flow path open, and a magnetic field generated by passing an electric current. A coil to be generated, a first end face facing the first direction, and a second end face located on the opposite side of the first end face and facing the second direction opposite to the first direction. A plurality of second circulation flow paths, each of which communicates with the first end face and the second end face, are provided, are located in the accommodation chamber, and are urged in the second direction by the magnetic field. The plunger is located between the sheet and the plunger inside the housing, passes through the insertion hole, and comes into contact with the sheet to block the first flow path and separate from the sheet. The valve member and the valve member, which are made to communicate the first flow path with the second flow path and are urged in the second direction by the plunger urged by the magnetic field, and the valve member. It is provided with an urging member that is urged by an elastic force in the direction of 1. Thus, as an example, the fluid that has flowed into the containment chamber through the insertion hole flows through the containment chamber in the first direction through at least one of the plurality of second circulation channels and a plurality of second circulation channels. It flows and circulates in the accommodating chamber in the second direction through at least one of the circulation channels of the above. Further, the fluid returns from the accommodating chamber to the second flow path through the first circulation flow path. As a result, the solenoid valve of the present embodiment can prevent the pressure in the accommodating chamber from increasing and causing a pressure difference between the accommodating chamber and the second flow path.

FIG. 1 is a cross-sectional view showing a solenoid valve of the brake control device according to the first embodiment. FIG. 2 is a perspective view showing the guide and the plate of the first embodiment in an exploded manner. FIG. 3 is a cross-sectional view showing a solenoid valve of the brake control device according to the second embodiment.

(First Embodiment)
Hereinafter, the first embodiment will be described with reference to FIGS. 1 and 2. In addition, in this specification, the constituent element which concerns on embodiment and the description of said element may be described by a plurality of expressions. The components and their description are examples and are not limited by the representations herein. The components may also be identified by names different from those herein. The components may also be described by expressions different from those herein.

FIG. 1 is a cross-sectional view showing a solenoid valve 21 of the brake control device 10 according to the first embodiment. The brake control device 10 is mounted on a vehicle 1 such as an automobile. The brake control device 10 is not limited to this example.

As shown in FIG. 1, the brake control device 10 includes a master cylinder (M / C) 11, a wheel cylinder (W / C) 12, an actuator 13, and an ECU (electronic control unit) 15. The brake control device 10 is not limited to this example.

A flow path C through which the brake fluid flows is provided between the M / C 11 and the W / C 12. The actuator 13 is provided between the M / C 11 and the W / C 12 in the path of the flow path C, and controls the pressure of the brake fluid.

The actuator 13 has a solenoid valve 21 and a pump 22. The solenoid valve 21 is, for example, a differential pressure control valve in the actuator 13. The actuator 13 further includes various components such as a pressure boost control valve, a pressure reduction control valve, a reservoir, a check valve, and a fixed capacitance damper. The solenoid valve 21 is not limited to the differential pressure control valve, but may be a pressure boost control valve, a pressure reducing control valve, or another valve.

The solenoid valve 21 is provided between the M / C 11 and the W / C 12 in the path of the flow path C. The flow path C may have a flow path that bypasses the solenoid valve 21. The solenoid valve 21 has a housing 31, a plunger 32, a valve member 33, a coil 34, and an urging member 35.

The solenoid valve 21 can be controlled into, for example, a communication state and a differential pressure state. In the normal time when the driver operates the brake pedal of the vehicle 1, the solenoid valve 21 is in a communicating state without a current flowing through the coil 34. On the other hand, in the solenoid valve 21, when a current is passed through the coil 34, the plunger 32 and the valve member 33 are urged in the valve closing direction by the magnetic field generated by the coil 34. As a result, the solenoid valve 21 functions like a relief valve and is in a differential pressure state.

The differential pressure value generated by the solenoid valve 21 changes according to the current value of the current flowing through the coil 34 of the solenoid valve 21. The differential pressure value generated by the solenoid valve 21 increases as the current value increases.

In the differential state electromagnetic valve 21, the pressure of the brake fluid (hereinafter referred to as W / C pressure) in the portion (hereinafter referred to as W / C12 side) connected to W / C12 via the flow path C is determined. When the pressure of the brake fluid in the portion connected to the M / C 11 via the flow path C (hereinafter referred to as the M / C 11 side) becomes higher than the pressure of the brake fluid (hereinafter referred to as the M / C pressure) by a predetermined value or more. Brake fluid is flowed from the W / C12 side to the M / C11 side. Therefore, the solenoid valve 21 in the differential state maintains the W / C pressure so as not to be higher than the predetermined value than the M / C pressure.

The solenoid valve 21 is provided with a check valve 21a that allows the flow of brake fluid from the M / C11 side to the W / C12 side. The check valve 21a makes it possible to transmit the M / C pressure to the W / C 12 when the brake pedal is depressed by the driver.

Hereinafter, the structure of the solenoid valve 21 will be described in detail. The housing 31 has a guide 41, a plate 42, a seat 43, a sleeve 44, and a filter 45. That is, the guide 41, the plate 42, the seat 43, the sleeve 44, and the filter 45 are provided in the housing 31. The guide 41 is an example of an outer cylinder. The plate 42 is an example of an inner cylinder.

The guide 41 is made of a magnetic material such as metal. The guide 41 is crimped to, for example, a substantially cylindrical recess 13b provided in the housing 13a of the actuator 13. A part of the guide 41 projects outward from the housing 13a of the actuator 13.

The guide 41 is formed in a substantially cylindrical shape extending along the central axis Ax. The central axis Ax passes through the substantially center of the guide 41 and extends in the longitudinal direction of the guide 41. The central axis Ax may be deviated from the center of the guide 41.

Hereinafter, for convenience, the direction along the central axis Ax is referred to as an axial direction, the direction orthogonal to the central axis Ax is referred to as a radial direction, and the direction rotating around the central axis Ax is referred to as a circumferential direction. The axial direction is the longitudinal direction of the guide 41.

The axial direction includes the first direction D1 and the second direction D2 shown in FIG. The first direction D1 is one direction along the central axis Ax, and may also be referred to as a valve opening direction. The second direction D2 is the opposite direction of the first direction D1 and may also be referred to as a valve closing direction.

An inner hole 50 is provided inside the substantially cylindrical guide 41. The inner hole 50 extends along the central axis Ax and penetrates the guide 41 in the axial direction. Therefore, the inner hole 50 is open to the end portion 41a of the guide 41 in the first direction D1 and the end portion 41b of the guide 41 in the second direction D2. The end portion 41a is located outside the housing 13a of the actuator 13. The end portion 41b is located inside the recess 13b of the actuator 13.

The inner hole 50 has a first fitting hole 51 and a second fitting hole 52. The first fitting hole 51 and the second fitting hole 52 are each a part of the inner hole 50. The first fitting hole 51 and the second fitting hole 52 communicate with each other in the axial direction.

The first fitting hole 51 is open to the end portion 41a of the guide 41. The cross section of the first fitting hole 51 orthogonal to the central axis Ax is formed, for example, in a substantially circular shape. The cross section of the first fitting hole 51 orthogonal to the central axis Ax may have another shape.

The second fitting hole 52 is open to the end portion 41b of the guide 41. The cross section of the second fitting hole 52 orthogonal to the central axis Ax is formed, for example, in a substantially circular shape. The cross section of the second fitting hole 52 orthogonal to the central axis Ax may have another shape.

The cross section of the second fitting hole 52 orthogonal to the central axis Ax is larger than the cross section of the first fitting hole 51 orthogonal to the central axis Ax. The first fitting hole 51 and the second fitting hole 52 communicate with each other. Therefore, a step is formed between the first fitting hole 51 and the second fitting hole 52. The first fitting hole 51 and the second fitting hole 52 are not limited to this example.

The guide 41 is provided with a plurality of through holes 55. The through hole 55 penetrates the guide 41 in the radial direction and communicates with the second fitting hole 52. The through hole 55 is located, for example, in the vicinity of the first fitting hole 51.

FIG. 2 is a perspective view showing the guide 41 and the plate 42 of the first embodiment in an exploded manner. FIG. 2 shows a cross section of the plate 42. The plate 42 is made of a magnetic material such as metal. The plate 42 may be made of another material. As shown in FIG. 2, the plate 42 has a tubular portion 61 and a support portion 62.

The tubular portion 61 is a substantially cylindrical wall extending along the central axis Ax. The tubular portion 61 has end faces 65 and 66, an outer peripheral surface 67, and an inner peripheral surface 68. One end surface 65 is located at the end of the tubular portion 61 in the first direction D1. The end face 65 is formed substantially flat and faces the first direction D1. The other end face 66 is located at the end of the tubular portion 61 in the second direction D2. In other words, the end face 66 is located on the opposite side of the end face 65. The end face 66 is formed substantially flat and faces the second direction D2.

The outer peripheral surface 67 faces outward in the radial direction. The inner peripheral surface 68 is located on the opposite side of the outer peripheral surface 67 and faces inward in the radial direction. Further, the inner peripheral surface 68 faces the central axis Ax. The outer peripheral surface 67 has a plurality of curved surfaces 67a and a plurality of planes 67b. In the present embodiment, the outer peripheral surface 67 has four curved surfaces 67a and four planes 67b. The outer peripheral surface 67 is not limited to this example.

The curved surface 67a is a substantially cylindrical curved surface extending along the central axis Ax. The plane 67b is a substantially flat surface facing in the radial direction. The four planes 67b are arranged at 90 ° intervals around the central axis Ax. The curved surface 67a and the plane 67b are arranged alternately in the circumferential direction.

The plane 67b is formed, for example, by cutting a substantially columnar outer peripheral surface 67. The plane 67b may be formed by another method. Further, the outer peripheral surface 67 may have a concave surface recessed from the curved surface 67a toward the central axis Ax, or a curved surface having a radius larger than that of the curved surface 67a, instead of the flat surface 67b.

The support portion 62 is a substantially annular wall protruding from the inner peripheral surface 68 of the tubular portion 61 toward the central axis Ax. In the axial direction, the length of the support portion 62 is shorter than the length of the tubular portion 61. The support portion 62 is provided adjacent to the end face 66. Therefore, the end surface of the tubular portion 61 in the second direction D2 and the end surface of the support portion 62 in the second direction D2 form the end surface 66 of the sheet 43. The support portion 62 is not limited to this example.

The support portion 62 has a support surface 69. The support surface 69 is an end surface of the support portion 62 in the first direction D1. The support surface 69 is formed in a substantially flat annular shape and faces the first direction D1. The support surface 69 is separated from the end surface 65 of the plate 42 in the second direction D2.

An insertion hole 70 is provided inside the plate 42. The insertion hole 70 extends along the central axis Ax and penetrates the plate 42 in the axial direction. Therefore, the insertion hole 70 is open to the end faces 65 and 66 of the plate 42. The insertion hole 70 has a first insertion hole 71 and a second insertion hole 72.

The first insertion hole 71 is a part of the insertion hole 70 provided inside the tubular portion 61. The first insertion hole 71 is formed (defined) by the inner peripheral surface 68 of the tubular portion 61. Therefore, the inner peripheral surface 68 is the inner peripheral surface of the first insertion hole 71.

The first insertion hole 71 is open to the end face 65. The cross section of the first insertion hole 71 orthogonal to the central axis Ax is formed in a substantially circular shape. The cross section of the first insertion hole 71 orthogonal to the central axis Ax may have another shape.

The second insertion hole 72 is a part of the insertion hole 70 provided inside the support portion 62. The second insertion hole 72 is open to the end face 66. The cross section of the second insertion hole 72 orthogonal to the central axis Ax is formed in a substantially circular shape. The cross section of the second insertion hole 72 orthogonal to the central axis Ax may have another shape.

The first insertion hole 71 and the second insertion hole 72 communicate with each other. The cross section of the second insertion hole 72 orthogonal to the central axis Ax is smaller than the cross section of the first insertion hole 71 orthogonal to the central axis Ax. Therefore, a support surface 69 as a step is provided between the first insertion hole 71 and the second insertion hole 72.

As shown in FIG. 1, the plate 42 is fitted into the first fitting hole 51 inside the guide 41. In the axial direction, the length of the first fitting hole 51 is substantially equal to the length of the plate 42. The end surface 65 of the plate 42 is located substantially in the same plane as the end portion 41a of the guide 41. The end surface 66 of the plate 42 faces the second fitting hole 52 of the guide 41.

The curved surface 67a of the outer peripheral surface 67 of the plate 42 shown in FIG. 2 comes into contact with the inner peripheral surface 51a of the first fitting hole 51 of the guide 41. The inner peripheral surface 51a is a substantially cylindrical curved surface provided on the guide 41 and forming the first fitting hole 51. The radius of the curved surface 67a is slightly larger than that of the inner peripheral surface 51a. The plate 42 is fixed to the guide 41 by being press-fitted into the first fitting hole 51 of the guide 41. The plate 42 is not limited to this example.

As shown in FIG. 1, a plurality of first circulation flow paths 75 are provided between the guide 41 and the plate 42. The plurality of first circulation flow paths 75 are examples of the first circulation flow path and the plurality of holes. The plurality of first circulation flow paths 75 are formed (defined) by the inner peripheral surface 51a of the first fitting hole 51 of the guide 41 and the four planes 67b of the outer peripheral surface 67 of the plate 42. Therefore, in the present embodiment, the housing 31 is provided with four first circulation flow paths 75. The number of the first circulation flow paths 75 is not limited to this example.

The four first circulation channels 75 are arranged at 90 ° intervals around the central axis Ax. In other words, the four first circulation flow paths 75 are arranged at substantially equal intervals in the circumferential direction. That is, the first circulation flow path 75 is arranged so as to be separated from the insertion hole 70 and to surround the insertion hole 70.

As described above, in the present embodiment, the first circulation flow path 75 is provided between the guide 41 and the plate 42. The first circulation flow path 75 is not limited to this example. For example, the first circulation flow path 75 may be formed by a hole provided in the housing 31.

Further, as described above, in the present embodiment, the first circulation flow path 75 is formed by a substantially cylindrical inner peripheral surface 51a and a flat surface 67b of the outer peripheral surface 67. However, the first circulation flow path 75 is not limited to this example, and may be formed (defined) by a concave surface recessed outward in the radial direction from the inner peripheral surface 51a and a substantially cylindrical outer peripheral surface 67.

The sheet 43 is fitted into the second fitting hole 52 at a position separated from the first fitting hole 51 and the second insertion hole 72 in the second direction D2. As a result, a space 78 is formed between the sheet 43 and the second insertion hole 72 in the axial direction. The space 78 is included in the second fitting hole 52. The through hole 55 communicates the space 78 with the outside of the guide 41.

The sheet 43 is made of metal and is formed in a substantially cylindrical shape. A first flow path 81 is provided inside the substantially cylindrical sheet 43. The first flow path 81 penetrates the sheet 43 in the axial direction along the central axis Ax. Therefore, the first flow path 81, the inner hole 50, the first insertion hole 71, and the second insertion hole 72 are arranged coaxially. The first flow path 81 and the second insertion hole 72 face each other through the space 78.

The first flow path 81 opens to the end surface 43a of the sheet 43 in the first direction D1 and the end surface 43b of the sheet 43 in the second direction D2. The end face 43a faces the space 78 and faces the first fitting hole 51 and the second insertion hole 72. The end face 43b is located on the opposite side of the end face 43a. The first flow path 81 can communicate with the space 78.

An orifice 81a is provided in the first flow path 81. The orifice 81a is a portion having a smaller cross section orthogonal to the central axis Ax than the other portion of the first flow path 81. Further, the seat 43 has a substantially conical seating surface 43c that tapers from the end surface 43a toward the orifice 81a.

The sleeve 44 is formed in a substantially cylindrical shape with a bottom and is opened in the second direction D2. The sleeve 44 is made of a non-magnetic metal such as stainless steel. The sleeve 44 is not limited to this example.

The end portion 41a of the guide 41 is inserted into the inside of the sleeve 44. The sleeve 44 is fixed to the guide 41 by welding or other means. As a result, inside the sleeve 44, a storage chamber 82 communicating with the first fitting hole 51 and the insertion hole 70 of the guide 41 is provided. The accommodation chamber 82 is separated from the first flow path 81 in the first direction D1.

The sleeve 44 has an inner peripheral surface 44a and a bottom surface 44b. The inner peripheral surface 44a is a substantially cylindrical surface extending along the central axis Ax. The inner peripheral surface 44a faces the central axis Ax. For example, a part of the inner peripheral surface 44a is welded to the guide 41. The bottom surface 44b is a substantially hemispherical surface facing the end portion 41a of the guide 41. The shapes of the inner peripheral surface 44a and the bottom surface 44b are not limited to this example.

The inner peripheral surface 44a, the bottom surface 44b, the end portion 41a of the guide 41, and the end surface 65 of the sleeve 44 form (define) the accommodation chamber 82. The accommodation room 82 is not limited to this example. The inner peripheral surface 44a, the bottom surface 44b, the end portion 41a of the guide 41, and the end surface 65 of the sleeve 44 face the inside of the accommodation chamber 82.

The filter 45 is formed in a substantially cylindrical shape extending along the central axis Ax. The guide 41 is fitted inside the filter 45. The filter 45 covers a plurality of through holes 55 provided in the guide 41 from the outside of the guide 41.

The filter 45 is provided with a plurality of through holes 83. Each of the plurality of through holes 83 penetrates the filter 45 in the radial direction. Each of the plurality of through holes 83 of the filter 45 is smaller than each of the plurality of through holes 55 of the guide 41. The through hole 83 of the filter 45 communicates with the through hole 55 of the guide 41. As a result, the filter 45 suppresses the inflow of foreign matter larger than the through hole 83 into the space 78.

An internal flow path Cv through which the brake fluid flows is provided inside the housing 31. The internal flow path Cv includes the above-mentioned first flow path 81 and the second flow path 85. The second flow path 85 includes through holes 55, 83, and space 78. Therefore, the first flow path 81 and the second flow path 85 can communicate with each other.

The internal flow path Cv is connected to the M / C 11 and the W / C 12 through the flow path C. The first flow path 81 is connected to W / C 12 through the flow path C. Further, the first flow path 81 is connected to the pump 22 through the flow path C. The second flow path 85 is connected to the M / C 11 through the flow path C. As described above, the first flow path 81 is on the W / C12 side of the internal flow path Cv, and the second flow path 85 is on the M / C11 side of the internal flow path Cv. The first flow path 81 and the second flow path 85 are not limited to this example.

The second flow path 85 is located between the first flow path 81 and the accommodation chamber 82. Further, the insertion hole 70 is located between the second flow path 85 and the accommodation chamber 82, and communicates the second flow path 85 and the accommodation chamber 82. The first insertion hole 71 communicates with the accommodation chamber 82. The second insertion hole 72 communicates with the second flow path 85.

Each of the plurality of first circulation flow paths 75 is also located between the second flow path 85 and the storage chamber 82, and communicates the second flow path 85 and the storage chamber 82. That is, the insertion hole 70 and the plurality of first circulation flow paths 75 communicate with the second flow path 85 and the accommodating chamber 82 in parallel. Therefore, the brake fluid flowing through the second flow path 85 passes through the insertion hole 70 and the first circulation flow path 75 and flows into the accommodation chamber 82. Therefore, the brake fluid fills the storage chamber 82.

For example, the seat 43 is provided with a check valve 21a. The check valve 21a connects the second flow path 85, the W / C12, and the pump 22 in parallel with the first flow path 81. The check valve 21a shuts off the flow of brake fluid from the W / C 12 and the pump 22 toward the second flow path 85. On the other hand, the check valve 21a allows the flow of brake fluid from the second flow path 85 toward the W / C 12 and the pump 22.

The plunger 32 is made of a magnetic material such as metal and is formed in a substantially columnar shape extending along the central axis Ax. The plunger 32 is located in the accommodation chamber 82 of the sleeve 44. Therefore, the plunger 32 is separated from the seat 43 in the first direction D1. The plunger 32 has a first end face 91, a second end face 92, and a side surface 93.

The first end face 91 is the end face of the plunger 32 in the first direction D1. The first end face 91 is not limited to this example. The first end surface 91 faces the bottom surface 44b of the sleeve 44.

The first end surface 91 has a flat surface 91a and a curved surface 91b. The plane 91a is formed substantially flat and faces the first direction D1. The curved surface 91b is a substantially hemispherical surface provided between the plane 91a and the side surface 93. The radius of at least a part of the curved surface 91b is substantially equal to the radius of the bottom surface 44b of the sleeve 44.

The second end face 92 is the end face of the plunger 32 in the second direction D2. The second end face 92 is located on the opposite side of the first end face 91. The second end face 92 is not limited to this example. For example, the plunger 32 may have a portion protruding from the second end face 92 in the second direction D2.

The second end face 92 is formed substantially flat and faces the second direction D2. The second end face 92 is not limited to this example, and may have another shape. The second end face 92 faces the end portion 41a of the guide 41 and the end face 65 of the plate 42 via a gap. Further, the second end surface 92 faces the end surface 43a of the sheet 43 via the guide 41 and the plate 42. By moving the plunger 32 in the second direction D2, the second end surface 92 may be able to come into contact with the end portion 41a of the guide 41 and the end surface 65 of the plate 42.

The side surface 93 is a substantially cylindrical surface extending along the central axis Ax between the first end surface 91 and the second end surface 92. The center of the side surface 93 may be slightly deviated from the central axis Ax. The side surface 93 faces the inner peripheral surface 44a of the sleeve 44. The diameter of the side surface 93 is slightly smaller than the diameter of the inner peripheral surface 44a of the sleeve 44. Therefore, a slight gap is provided between at least a part of the side surface 93 and the inner peripheral surface 44a.

The side surface 93 of the plunger 32 is supported by the inner peripheral surface 44a of the sleeve 44 so as to be movable in the axial direction with respect to the housing 31. In other words, the plunger 32 is axially guided by the inner peripheral surface 44a of the sleeve 44.

For example, the inner peripheral surface 44a of the sleeve 44 abuts on a part of the side surface 93 to limit the movement of the plunger 32 in the radial direction. Further, the inner peripheral surface 44a is slightly separated from the other part of the side surface 93 to allow the plunger 32 to move smoothly in the axial direction.

The plunger 32 is provided with a plurality of second circulation flow paths 95. The second circulation flow path 95 is a groove recessed from the side surface 93 toward the central axis Ax. The second circulation flow path 95 is not limited to this example, and may be, for example, a hole.

Each of the plurality of second circulation flow paths 95 extends in the substantially axial direction between the plane 91a of the first end surface 91 and the second end surface 92. Therefore, the second circulation flow path 95 opens to the side surface 93, the first end face 91, and the second end face 92. In other words, each of the plurality of second circulation flow paths 95 communicates the first end face 91 and the second end face 92.

In this embodiment, the plunger 32 is provided with four second circulation channels 95. The number of the second circulation flow paths 95 is not limited to this example, and may be two, three, or five or more. The plurality of second circulation flow paths 95 are arranged at substantially equal intervals in the circumferential direction.

The solenoid valve 21 is arranged so that the central axis Ax faces in the substantially horizontal direction. Therefore, at least one of the plurality of first circulation flow paths 75 is located above the insertion hole 70 regardless of the method (phase) of assembling the plate 42 to the guide 41. Further, at least one of the plurality of second circulation flow paths 95 is located above the insertion hole 70.

The valve member 33 is located inside the housing 31 between the seat 43 and the plunger 32. The valve member 33 can move axially with respect to the seat 43 through the insertion hole 70. The valve member 33 has a shaft 101 and a valve body 102.

The shaft 101 is made of a non-magnetic metal such as stainless steel. The shaft 101 has a first sliding portion 105 and a second sliding portion 106. The first sliding portion 105 and the second sliding portion 106 are formed in a substantially columnar shape extending along the central axis Ax. The cross section of the first sliding portion 105 orthogonal to the central axis Ax is larger than the cross section of the second sliding portion 106 orthogonal to the central axis Ax.

The first sliding portion 105 is accommodated in the first insertion hole 71. The first sliding portion 105 is supported in the first insertion hole 71 so as to be movable in the axial direction by the inner peripheral surface 68 of the plate 42. A slight gap is provided between the first sliding portion 105 and the inner peripheral surface 68.

The second sliding portion 106 projects from the first sliding portion 105 through the second insertion hole 72 to the space 78. The second sliding portion 106 is supported in the second insertion hole 72 so as to be movable in the axial direction by the inner peripheral surface 72a of the second insertion hole 72. The inner peripheral surface 72a is a substantially cylindrical curved surface provided on the plate 42 and forming the second insertion hole 72. A slight gap is provided between the second sliding portion 106 and the inner peripheral surface 72a of the second insertion hole 72.

The valve body 102 is formed, for example, in a substantially hemispherical shape. The shape of the valve body 102 is not limited to this example. The valve body 102 is located in the space 78 and is provided at the end of the second sliding portion 106 in the second direction D2. The valve body 102 can move in the axial direction integrally with the shaft 101.

The end of the first sliding portion 105 of the shaft 101 in the first direction D1 abuts on the second end surface 92 of the plunger 32. The shaft 101 can move in the axial direction integrally with the plunger 32. The shaft 101 may be fixed to the plunger 32.

The valve body 102 of the valve member 33 closes the first flow path 81 by abutting on the seat surface 43c of the seat 43. In other words, the valve body 102 abuts on the seat surface 43c to block between the first flow path 81 and the second flow path 85.

On the other hand, the valve body 102 opens the first flow path 81 by separating from the seat surface 43c, and allows the first flow path 81 to communicate with the second flow path 85. In this way, the valve member 33 can move between the position where the first flow path 81 is closed and the position where the first flow path 81 communicates with the second flow path 85.

The coil 34 is, for example, a solenoid wound around the central axis Ax. The coil 34 is located on the outside of the sleeve 44 and surrounds the sleeve 44. The coil 34 generates a magnetic field by passing an electric current. The ECU 15 controls the current flowing through the coil 34.

The coil 34 is housed in a cylindrical spool made of, for example, a non-magnetic material such as resin. In addition, a yoke made of magnetic material holds the spool and coil 34. The spool and yoke may be included in the housing 31.

The urging member 35 is, for example, a coil spring wound around the central axis Ax. The urging member 35 may be another elastic body. The urging member 35 is housed in the first insertion hole 71 and is located between the support surface 69 of the plate 42 and the first sliding portion 105 of the shaft 101.

The urging member 35 is supported by the support surface 69 and the first sliding portion 105, and is compressed between the support surface 69 and the first sliding portion 105. Therefore, the urging member 35 is supported by the support surface 69 and urges the first sliding portion 105 in the first direction D1 by an elastic force.

The urging member 35 is not limited to the support surface 69, and may be supported by, for example, the end surface 43a of the sheet 43. In this case, for example, the plate 42 omits the support portion 62, and the urging member 35 is supported by the end face 43a and the first sliding portion 105.

When the first sliding portion 105 of the shaft 101 urged by the urging member 35 moves in the first direction D1, the valve body 102 and the plunger 32 also move in the first direction D1 integrally with the shaft 101. .. As a result, the valve member 33 is separated from the seat 43.

When the valve member 33 is separated from the seat 43 to a predetermined position (fully open position), the curved surface 91b of the first end surface 91 of the plunger 32 comes into contact with the bottom surface 44b of the sleeve 44. The bottom surface 44b supports the curved surface 91b of the plunger 32 when the valve member 33 is in the fully open position, limiting the plunger 32 from further separating from the seat 43.

When the valve member 33 is located in the fully open position, the flat surface 91a of the first end surface 91 of the plunger 32 is separated from the bottom surface 44b of the sleeve 44. Therefore, a gap is provided between the flat surface 91a and the bottom surface 44b. Further, as described above, a slight gap is provided between at least a part of the side surface 93 of the plunger 32 and the inner peripheral surface 44a of the sleeve 44.

The ECU 15 can control the W / C pressure generated in each W / C 12 by controlling the solenoid valve 21 and the pump 22. For example, in a normal state, the ECU 15 does not pass a current through the coil 34. The valve member 33 is urged by the urging member 35 and is located in the fully open position. As a result, the valve body 102 of the valve member 33 is separated from the seat surface 43c of the seat 43, and the solenoid valve 21 is in a communicating state.

In the communicating solenoid valve 21, the first flow path 81 communicates with the second flow path 85. In other words, the solenoid valve 21 opens, and the flow path C on the M / C11 side and the flow path C on the W / C12 side communicate with each other. Therefore, the brake fluid can flow between the M / C11 side and the W / C12 side.

When the brake pedal of the vehicle 1 is depressed, the brake fluid flows from the M / C 11 to the W / C 12 through the first flow path 81. On the other hand, when the depression of the brake pedal is stopped, the brake fluid is quickly returned from the W / C 12 to the M / C 11 through the first flow path 81.

On the other hand, when the pressure of the W / C 12 is increased by the pump 22, the ECU 15 drives the pump 22 and controls the solenoid valve 21 to a differential pressure state. The ECU 15 generates a magnetic field in the coil 34 by passing an electric current through the coil 34.

By generating a magnetic field, the coil 34 attracts the plunger 32 in the second direction D2 by an electromagnetic force. In other words, the plunger 32 is urged in the second direction D2 toward the seat 43 by the magnetic field generated by the coil 34.

The plunger 32 attracted by the magnetic field pushes the shaft 101 in the second direction D2 and brings the valve body 102 closer to the seat surface 43c of the seat 43. In this way, the valve member 33 is urged in the second direction D2 by the plunger 32 urged by the magnetic field.

The brake fluid discharged by the pump 22 flows into the first flow path 81 from the flow path C on the W / C 12 side. The brake fluid pushes the valve body 102 of the valve member 33 urged by the magnetic field of the coil 34 in the first direction D1. The brake fluid separates the valve body 102 from the seat surface 43c of the seat 43, passes through the gap between the valve body 102 and the seat surface 43c, and enters the space 78 of the first flow path 81 to the second flow path 85. Inflow. In this way, the pump 22 causes the brake fluid to flow from the first flow path 81 to the second flow path 85.

The attractive force generated by the magnetic field urges the valve member 33 in the second direction D2 (valve closing direction) approaching the seat 43, while the reaction force generated by the brake fluid and the urging member 35 causes the valve member 33 from the seat 43. Encourage in the first direction D1 (valve opening direction) to move away. The valve member 33 moves to a position where the suction force and the reaction force are balanced, and adjusts the opening degree (valve opening degree) of the first flow path 81.

The suction force changes depending on the current value of the current flowing through the coil 34. Therefore, the ECU 15 adjusts the position of the valve member 33 by adjusting the current flowing through the coil 34. By adjusting the position of the valve member 33, the flow rate of the brake fluid flowing from the first flow path 81 to the second flow path 85 and the pressure in the first flow path 81 and W / C 12 are adjusted. ..

As described above, in the solenoid valve 21, the valve member 33 is moved in the axial direction with respect to the seat 43. Further, the plunger 32 urges the valve member 33 in the second direction D2, or is urged in the first direction D1 by the valve member 33, and moves integrally with the valve member 33.

As described above, when the pump 22 discharges the brake fluid and the solenoid valve 21 is controlled to be in a differential pressure state, the brake fluid flows from the first flow path 81 to the second flow path 85. When at least a part of the brake fluid hits the valve body 102 of the valve member 33, it flows along the valve member 33.

As shown by the arrow in FIG. 1, the flow Fl of the brake fluid passes through the valve member 33 and passes through the gap between the second sliding portion 106 and the inner peripheral surface 72a of the second insertion hole 72. .. Further, the flow Fl of the brake fluid passes through the first insertion hole 71 and flows into the accommodation chamber 82.

Generally, when the brake fluid flows into the accommodation chamber 82, the pressure in the accommodation chamber 82 may increase. In this case, the valve member 33 is urged in the second direction D2 due to the pressure difference between the accommodation chamber 82 and the second flow path 85. That is, there is a possibility that the direction of the fluid force that urges the valve member 33 is reversed from the first direction D1 (valve opening direction) to the second direction D2 (valve closing direction).

However, the solenoid valve 21 of the present embodiment can suppress an increase in the pressure in the accommodation chamber 82 as follows. First, the flow Fl of the brake fluid flowing into the accommodation chamber 82 passes through at least one of the plurality of second circulation flow paths 95, and is between the plunger 32 and the bottom surface 44b of the sleeve 44 in the accommodation chamber 82. Reach the inner part 82a.

The flow of brake fluid Fl flows from the inner portion 82a through at least one of the plurality of second circulation flow paths 95, and is an opening between the plunger 32 and the guide 41 and the plate 42 in the accommodation chamber 82. Return to part 82b. In this way, the flow Fl of the brake fluid circulates inside the accommodation chamber 82.

Further, the brake fluid flow Fl returns to the second flow path 85 through the plurality of first circulation flow paths 75. In this way, the flow Fl of the brake fluid circulates between the second flow path 85 and the accommodating chamber 82 through the insertion hole 70 and the first circulation flow path 75.

The accommodation chamber 82 is not a dead end and communicates with the second flow path 85 so that the flow Fl of the brake fluid passes through the first circulation flow path 75 and returns to the second flow path 85. Therefore, the pressure of the accommodating chamber 82 into which the brake fluid flows approaches the pressure of the second flow path 85. Therefore, the first circulation flow path 75 suppresses the occurrence of a pressure difference between the accommodating chamber 82 and the second flow path 85, and the pressure difference eventually causes the valve member 33 to attach to the second direction D2. It can suppress the momentum.

Further, a disturbance such as a pressure fluctuation in the internal flow path Cv or a change in the discharge amount of the pump 22 may be input to the plunger 32 and the valve member 33. The disturbance may cause self-excited vibration in the plunger 32 and the valve member 33. However, the brake fluid filled in the accommodation chamber 82 generates a damping force due to the fluid resistance, and can suppress the plunger 32 and the valve member 33 from self-excited vibration.

On the other hand, air may be present in the containment chamber 82. For example, the air flowing together with the brake fluid in the internal flow path Cv passes through the gap between the inner peripheral surface 72a of the second insertion hole 72 and the second sliding portion 106 of the shaft 101, and flows into the accommodation chamber 82. Sometimes. Further, the air contained in the brake fluid that fills the accommodation chamber 82 may precipitate due to, for example, a temperature change. If air is mixed in the brake fluid of the accommodation chamber 82, the fluid resistance in the accommodation chamber 82 may decrease.

As described above, in the solenoid valve 21 of the present embodiment, the flow Fl of the brake fluid circulates through the inner portion 82a of the accommodation chamber 82. Therefore, even if air is present in the inner portion 82a, the flow Fl of the brake fluid allows the air existing in the accommodation chamber 82 to flow through the first circulation flow path 75 and the second circulation flow path 95. It can be discharged to the road 85.

At least one of the plurality of first circulation channels 75 and at least one of the plurality of second circulation channels 95 are located above the insertion hole 70. The air in the containment chamber 82 tends to collect at the upper end of the containment chamber 82 due to buoyancy. Therefore, the flow Fl of the brake fluid passing through the first circulation flow path 75 and the second circulation flow path 95 located above the insertion hole 70 can discharge the air from the accommodation chamber 82.

As described above, since the air in the accommodation chamber 82 is discharged by the flow Fl of the brake fluid, the decrease in the fluid resistance of the brake fluid due to the air is eliminated. Therefore, the solenoid valve 21 can suppress the damping force due to the fluid resistance from being lowered by the air, and can suppress the plunger 32 and the valve member 33 from self-excited vibration.

In the brake control device 10 according to the first embodiment described above, the housing 31 includes a first flow path 81, a storage chamber 82 separated from the first flow path 81 in the first direction D1, and the accommodation chamber 82. A second flow path 85 located between the first flow path 81 and the accommodation chamber 82 and capable of communicating with the first flow path 81, and an insertion connecting the second flow path 85 and the accommodation chamber 82. The hole 70 is provided with a first circulation flow path 75 that is separated from the insertion hole 70 and communicates with the second flow path 85 and the accommodating chamber 82. The housing 31 has a sheet 43 through which the first flow path 81 opens. The plunger 32 has a first end face 91 facing the first direction D1 and a second end face 92 located on the opposite side of the first end face 91 and facing the second direction D2. The plunger 32 is provided with a plurality of second circulation flow paths 95 that communicate the first end face 91 and the second end face 92. The plunger 32 is located in the accommodation chamber 82 and is urged in the second direction D2 by the magnetic field generated by the coil 34. The valve member 33 is located inside the housing 31 between the seat 43 and the plunger 32 and passes through the insertion hole 70. The valve member 33 closes the first flow path 81 by coming into contact with the seat 43, and communicates the first flow path 81 with the second flow path 85 by separating from the seat 43. The valve member 33 is urged in the second direction D2 by the plunger 32 urged by the magnetic field. The urging member 35 urges the valve member 33 in the first direction D1.

The brake fluid flowing from the first flow path 81 to the second flow path 85 may flow along the valve member 33. In this case, the brake fluid and the air mixed in the brake fluid may flow into the accommodation chamber 82 through the gap between the inner peripheral surface of the insertion hole 70 and the valve member 33. However, in the solenoid valve 21 of the present embodiment, the housing 31 is provided with the first circulation flow path 75 that communicates the second flow path 85 and the accommodation chamber 82, and the plunger 32 is provided with the first end face 91. A second circulation flow path 95 that communicates with the second end face 92 is provided. As a result, the brake fluid that has flowed into the accommodation chamber 82 through the insertion hole 70 flows through the accommodation chamber 82 in the first direction D1 through at least one of the plurality of second circulation flow paths 95, and at the same time, a plurality of brake fluids flow into the accommodation chamber 82. Through at least one of the second circulation flow paths 95 of the above, the accommodation chamber 82 flows in the second direction D2 and circulates. Further, the brake fluid returns from the accommodating chamber 82 to the second flow path 85 through the first circulation flow path 75. As a result, the solenoid valve 21 of the present embodiment can suppress an increase in the pressure of the accommodation chamber 82 and a pressure difference between the accommodation chamber 82 and the second flow path 85, and the pressure difference is the valve. It is possible to prevent the member 33 from being urged in the second direction. Therefore, the solenoid valve 21 can easily balance the attractive force and the reaction force. Further, the brake fluid can be circulated so that the air in the accommodation chamber 82 can be discharged to the second flow path 85. As a result, the solenoid valve 21 of the present embodiment suppresses the air in the accommodation chamber 82 from reducing the fluid resistance due to the brake fluid in the accommodation chamber 82, and the valve member 33 and the plunger 32 generate self-excited vibration due to disturbance. Can be suppressed.

The housing 31 has a guide 41 and a plate 42 fitted inside the guide 41. The insertion hole 70 is provided inside the plate 42. The first circulation flow path 75 is provided between the guide 41 and the plate 42. As a result, in the solenoid valve 21 of the present embodiment, the insertion hole 70 and the first circulation flow path 75 can be easily provided in the housing 31.

The plate 42 has a support surface 69 that supports the urging member 35. As a result, the urging member 35 is arranged outside the second flow path 85. Therefore, the solenoid valve 21 of the present embodiment can suppress the urging member 35 from affecting the flow of the brake fluid in the second flow path 85.

The housing 31 is provided with a plurality of first circulation flow paths 75. Each of the plurality of first circulation flow paths 75 communicates with the second flow path 85 and the accommodating chamber 82, and is arranged so as to surround the insertion hole 70. When the solenoid valve 21 is arranged so that the first flow path 81 is substantially horizontal, at least one of the plurality of first circulation flow paths 75 is located above the insertion hole 70. Since the air in the accommodation chamber 82 moves upward due to buoyancy, it moves to the vicinity of the first circulation flow path 75 located above the insertion hole 70. The brake fluid discharges air from the accommodating chamber 82 through the first circulation flow path 75. As a result, the solenoid valve 21 of the present embodiment can discharge the air in the accommodation chamber 82 to the second flow path 85 through the first circulation flow path 75 located above the insertion hole 70.

The first flow path 81 and the second flow path 85 are connected to the M / C 11 and the W / C 12 through the flow path C. For example, the brake fluid of M / C11 or W / C12 flows from one of the first flow path 81 and the second flow path 85 to the other. The brake fluid and air may flow along the valve member 33 as described above. However, in the brake control device 10 of the present embodiment, the brake fluid that has flowed into the accommodation chamber 82 through the insertion hole 70 circulates in the accommodation chamber 82. Further, the brake fluid returns from the accommodating chamber 82 to the second flow path 85 through the first circulation flow path 75. As a result, the brake control device 10 of the present embodiment can suppress the occurrence of a pressure difference between the accommodation chamber 82 and the second flow path 85, and by extension, it becomes easy to balance the suction force and the reaction force. Further, the brake fluid can be circulated so that the air in the accommodation chamber 82 can be discharged to the second flow path 85. As a result, the brake control device 10 of the present embodiment suppresses the air in the accommodation chamber 82 from reducing the fluid resistance due to the brake fluid in the accommodation chamber 82, and the valve member 33 and the plunger 32 generate self-excited vibration due to disturbance. It can be suppressed.

(Second embodiment)
The second embodiment will be described below with reference to FIG. In the description of the following embodiments, the components having the same functions as the components already described may be designated by the same reference numerals as those described above, and the description may be omitted. Further, the plurality of components with the same reference numerals do not necessarily have all the functions and properties in common, and may have different functions and properties according to each embodiment.

FIG. 3 is a cross-sectional view showing the solenoid valve 211 of the brake control device 200 according to the second embodiment. The brake control device 200 is mounted on the vehicle 1 and has an M / C 11, a W / C 12, an actuator 201, a reservoir 202, and an ECU 15.

Similar to the actuator 13 of the first embodiment, the actuator 201 is provided between the M / C 11 and the W / C 12 in the path of the flow path C to control the pressure of the brake fluid. The reservoir 202 is provided in the flow path C and stores the brake fluid. The reservoir 202 is open to the atmosphere, for example. Therefore, the pressure of the brake fluid in the reservoir 202 substantially coincides with the atmospheric pressure.

The actuator 201 has a solenoid valve 211 and a pump 22. The solenoid valve 211 is provided between the M / C 11 and the W / C 12, similarly to the solenoid valve 21 of the first embodiment. The solenoid valve 211 has a housing 221, a plunger 222, a valve member 223, a coil 34, and an urging member 35.

The housing 221 has a guide 231, a seat 43, a sleeve 44, and a filter 45. The guide 231 is a member made of a magnetic material such as metal. The guide 231 is formed in a substantially cylindrical shape extending along the central axis Ax.

An inner hole 240 is provided inside the guide 231. The inner hole 240 extends along the central axis Ax and penetrates the guide 231 in the axial direction. Therefore, the inner hole 240 is open to the end portion 231a of the guide 231 in the first direction D1 and the end portion 231b of the guide 231 in the second direction D2.

The inner hole 240 has a fitting hole 241 and an insertion hole 242. The fitting hole 241 and the insertion hole 242 are each a part of the inner hole 240. The fitting hole 241 and the insertion hole 242 communicate with each other in the axial direction.

The fitting hole 241 is open to the end portion 231b of the guide 231. The housing 221 has an inner peripheral surface 241a and a bottom surface 241b of the fitting hole 241. The inner peripheral surface 241a is a substantially cylindrical curved surface facing inward in the radial direction. The bottom surface 241b is a substantially flat substantially circular plane facing the second direction D2.

The sheet 43 is fitted into the fitting hole 241 at a position separated from the insertion hole 242 in the second direction D2. As a result, the seat 43 is attached to the guide 231. The sheet 43 comes into contact with the inner peripheral surface 241a of the fitting hole 241. The end surface 43a of the sheet 43 faces the bottom surface 241b of the fitting hole 241 via a gap.

Similar to the housing 31 of the first embodiment, the housing 221 is provided with an internal flow path Cv through which the brake fluid flows. The internal flow path Cv has a first flow path 81 and a second flow path 250. The second flow path 250 has an inner chamber 251 and a plurality of through holes 252.

The inner chamber 251 is a space provided inside the housing 221. The inner chamber 251 is a part of the fitting hole 241 and is formed (defined, partitioned) by the end surface 43a of the sheet 43 and the inner peripheral surface 241a and the bottom surface 241b of the fitting hole 241. The first flow path 81 of the sheet 43 can communicate with the inner chamber 251.

The plurality of through holes 252 are provided in the guide 231. The through hole 252 penetrates the guide 231 in the radial direction and opens to the inner peripheral surface 241a of the fitting hole 241. The through hole 252 communicates the inner chamber 251 with the outside of the guide 231.

The insertion hole 242 is open to the end portion 231a of the guide 231. The insertion hole 242 has a third flow path 255 and a first communication hole 256. The third flow path 255 and the first communication hole 256 communicate with each other in the axial direction.

The third flow path 255 is open to the end portion 231a of the guide 231. The guide 231 has an inner peripheral surface 255a and a bottom surface 255b of the third flow path 255. The inner peripheral surface 255a is a substantially cylindrical curved surface facing inward in the radial direction. The bottom surface 255b is a substantially flat, substantially circular plane facing the first direction D1. The bottom surface 255b of the third flow path 255 is located on the opposite side of the bottom surface 241b of the fitting hole 241.

The first communication hole 256 opens to the bottom surface 241b of the fitting hole 241 and the bottom surface 255b of the third flow path 255. Therefore, the first communication hole 256 communicates the inner chamber 251 of the second flow path 250 and the third flow path 255. In other words, the first communication hole 256 separates the inner chamber 251 from the third flow path 255.

The guide 231 has an inner peripheral surface 256a of the first communication hole 256. The inner peripheral surface 256a is a substantially cylindrical curved surface facing inward in the radial direction. The diameter of the inner peripheral surface 256a of the first communication hole 256 is shorter than the diameter of the inner peripheral surface 241a of the fitting hole 241 and shorter than the diameter of the inner peripheral surface 255a of the third flow path 255. Therefore, in the guide 231, a support portion 257 is formed between the inner chamber 251 and the third flow path 255.

The support portion 257 protrudes inward in the radial direction from the inner peripheral surface 241a of the fitting hole 241 and the inner peripheral surface 255a of the third flow path 255. The bottom surface 255b of the third flow path 255 is provided at the end of the support portion 257 in the first direction D1. The bottom surface 241b of the fitting hole 241 is provided at the end of the support portion 257 in the second direction D2. The first communication hole 256 is provided inside the support portion 257 in the radial direction.

The end portion 231a of the guide 231 is inserted into the inside of the sleeve 44. As a result, inside the sleeve 44, a storage chamber 258 communicating with the third flow path 255 of the guide 231 is provided. The accommodation chamber 258 is separated from the first flow path 81 in the first direction D1.

The inner peripheral surface 44a of the sleeve 44 is welded to the guide 231. The bottom surface 44b of the sleeve 44 faces the end 231a of the guide 231. The inner peripheral surface 44a and the bottom surface 44b of the sleeve 44 and the end portion 231a of the guide 231 form (regulate, partition) the accommodation chamber 258.

The second flow path 250 is located between the first flow path 81 and the accommodation chamber 258. Further, the third flow path 255 is located between the inner chamber 251 of the second flow path 250 and the accommodation chamber 258. The inner chamber 251 and the accommodation chamber 258 communicate with each other through the third flow path 255 and the first communication hole 256.

The guide 231 of the second embodiment is further provided with a fourth flow path 261 and a second communication hole 262. The fourth flow path 261 has a vertical discharge hole 265 and a horizontal discharge hole 266. The fourth flow path 261 is not limited to this example.

The vertical discharge hole 265 extends in the axial direction at a position radially separated from the third flow path 255. The vertical discharge hole 265 may extend in another direction. One end of the vertical discharge hole 265 opens into the end 231a of the guide 231. Therefore, the vertical discharge hole 265 communicates with the accommodation chamber 258. The other end of the vertical drain hole 265 communicates with the horizontal drain hole 266.

The lateral discharge hole 266 is located between the second flow path 250 and the accommodation chamber 258. Further, the lateral discharge hole 266 is radially outwardly separated from the third flow path 255. Therefore, the fourth flow path 261 is separated from the second flow path 250 and the third flow path 255. The horizontal discharge hole 266 extends in the radial direction and communicates the vertical discharge hole 265 with the outside of the guide 231.

The lateral discharge hole 266 communicates with the through hole 252 of the second flow path 250 outside the guide 231. For example, a merging chamber 267 is provided between the filter 45 and the guide 231. The merging chamber 267 is an example of a space outside the second flow path. The merging chamber 267 is located outside the guide 231 and the second flow path 250. Both the through hole 252 and the lateral discharge hole 266 communicate with the merging chamber 267. Therefore, the through hole 252 communicates with the lateral discharge hole 266 via the merging chamber 267.

The merging chamber 267 communicates with the flow path C via the filter 45. The merging chamber 267 is connected to the reservoir 202, for example, through the flow path C. Therefore, the pressure of the brake fluid in the merging chamber 267 substantially coincides with the atmospheric pressure. The pressure of the brake fluid in the merging chamber 267 is not limited to this example. The connection between the merging chamber 267 and the reservoir 202 may be cut off by a valve.

The second communication hole 262 communicates the third flow path 255 and the fourth flow path 261. For example, the second communication hole 262 opens continuously from the lateral discharge hole 266 of the fourth flow path 261 to the inner peripheral surface 255a of the third flow path 255. As a result, the second communication hole 262 communicates the third flow path 255 with the lateral discharge hole 266.

The diameters of the second communication hole 262, the lateral discharge hole 266, and the through hole 252 of the second flow path 250 are substantially equal to each other. The diameters of the second communication hole 262, the lateral discharge hole 266, and the through hole 252 are not limited to this example.

The solenoid valve 211 is arranged so that the central axis Ax faces in the substantially horizontal direction. The fourth flow path 261 is located above the third flow path 255. The position of the fourth flow path 261 is not limited to this example.

The plunger 222 is made of a magnetic material such as metal and is formed in a substantially columnar shape extending along the central axis Ax. The plunger 222 is located in the containment chamber 258 of the sleeve 44. Therefore, the plunger 222 is separated from the seat 43 in the first direction D1. The plunger 222 has a first end face 271, a second end face 272, and a side surface 273.

The first end face 271 is the end face of the plunger 222 in the first direction D1 and faces the first direction D1. The first end face 271 is not limited to this example. The first end face 271 faces the bottom surface 44b of the sleeve 44.

The first end face 271 is formed in a substantially hemispherical shape. The radius of at least a part of the first end face 271 is substantially equal to the radius of the bottom surface 44b of the sleeve 44. The first end face 271 is not limited to this example.

The second end face 272 is the end face of the plunger 222 in the second direction D2. The second end face 272 is located on the opposite side of the first end face 271. The second end face 272 is not limited to this example. For example, the plunger 222 may have a portion protruding from the second end face 272 in the second direction D2.

The second end face 272 is formed substantially flat and faces the second direction D2. The second end face 272 is not limited to this example, and may have another shape. The second end face 272 faces the end 231a of the guide 231 via a gap. Further, the second end face 272 faces the end face 43a of the sheet 43 via the guide 231. By moving the plunger 222 in the second direction D2, the second end surface 272 may be able to come into contact with the end portion 231a of the guide 231.

The side surface 273 is a substantially cylindrical curved surface extending along the central axis Ax between the first end surface 271 and the second end surface 272. The center of the side surface 273 may be slightly deviated from the central axis Ax. The side surface 273 faces the inner peripheral surface 44a of the sleeve 44. The side surface 273 is movably supported by the inner peripheral surface 44a in the axial direction (first direction D1 and second direction D2) with respect to the housing 221.

The plunger 222 is provided with a plurality of fifth flow paths 275. The plurality of fifth flow paths 275 include a first hole 276 and a plurality of grooves 277. That is, the first hole 276 is one of the plurality of fifth flow paths 275. Further, each of the plurality of grooves 277 is one of the plurality of fifth flow paths 275.

The first hole 276 penetrates the plunger 222 in the axial direction. The first hole 276 opens in the first end face 271 and the second end face 272. Therefore, the first hole 276 communicates the first end face 271 and the second end face 272.

The plurality of grooves 277 are recessed from the first end surface 271 and the side surface 273 of the plunger 222, respectively. Each of the plurality of grooves 277 extends in the substantially axial direction between the first end face 271 and the second end face 272. Therefore, the groove 277 opens to the first end face 271, the second end face 272, and the side surface 273. In other words, the groove 277 communicates the first end face 271 and the second end face 272.

In this embodiment, the plunger 222 is provided with two grooves 277. The number of grooves 277 is not limited to this example, and may be one or three or more. The plurality of grooves 277 are arranged at substantially equal intervals in the circumferential direction.

The valve member 223 is located between the seat 43 and the plunger 222 through the third flow path 255 and the first communication hole 256. The valve member 223 can move in the axial direction with respect to the seat 43. The valve member 223 has a shaft 281 and a valve body 282.

The shaft 281 is made of a non-magnetic metal such as stainless steel. The shaft 281 has a first sliding portion 285 and a second sliding portion 286. The first sliding portion 285 and the second sliding portion 286 are formed in a substantially columnar shape extending along the central axis Ax. The cross section of the first sliding portion 285 orthogonal to the central axis Ax is larger than the cross section of the second sliding portion 286 orthogonal to the central axis Ax.

The first sliding portion 285 is accommodated in the third flow path 255. The first sliding portion 285 has end surfaces 285a and 285b, an outer peripheral surface 285c, and two concave surfaces 285d. The end face 285a is an example of the third end face.

The end face 285a is provided at the end of the valve member 223 in the first direction D1. The end face 285a faces the first direction D1. Further, the end face 285a faces the second end face 272 of the plunger 222 and comes into contact with the second end face 272. Therefore, the shaft 281 can move in the axial direction integrally with the plunger 222. The end face 285b is provided at the end of the first sliding portion 285 in the second direction D2.

The outer peripheral surface 285c is a substantially cylindrical curved surface extending along the central axis Ax between the end surfaces 285a and 285b and facing outward in the radial direction. The outer peripheral surface 285c is supported so as to be movable in the axial direction by the inner peripheral surface 255a of the third flow path 255. A slight gap is provided between the outer peripheral surface 285c and the inner peripheral surface 255a.

The concave surface 285d is a flat surface that is recessed from the outer peripheral surface 285c and faces outward in the radial direction. The concave surface 285d is connected to the end surface 285b and is separated from the end surface 285a. That is, in the axial direction, a part of a substantially cylindrical outer peripheral surface 285c is provided between the end surface 285a and the concave surface 285d.

A gap flow path 255c is formed (defined, sectioned) between the concave surface 285d and the inner peripheral surface 255a. The gap flow path 255c is a part of the third flow path 255. The cross section of the gap flow path 255c orthogonal to the central axis Ax is larger than the cross section of the gap between the outer peripheral surface 285c orthogonal to the central axis Ax and the inner peripheral surface 255a.

A second hole 290 is provided in the first sliding portion 285. The second hole 290 has a horizontal hole 291 and a vertical hole 292. The lateral hole 291 penetrates the first sliding portion 285 in the radial direction and opens in the two concave surfaces 285d. Therefore, the horizontal hole 291 communicates with the gap flow path 255c of the third flow path 255. The vertical hole 292 extends in the axial direction and opens to the end surface 285a of the first sliding portion 285 and the inner surface of the horizontal hole 291.

The vertical hole 292 that opens in the end face 285a faces the first hole 276 that opens in the second end face 272 of the plunger 222. The vertical hole 292 communicates with the first hole 276. Therefore, the second hole 290 communicates the third flow path 255 with the first hole 276.

The second sliding portion 286 projects from the end surface 285b of the first sliding portion 285 through the first communication hole 256 to the inner chamber 251. The second sliding portion 286 is supported by the inner peripheral surface 256a so as to be movable in the axial direction in the first communication hole 256. A slight gap is provided between the second sliding portion 286 and the inner peripheral surface 256a of the first communication hole 256.

The valve body 282 is located in the inner chamber 251 and is provided at the end of the valve member 223 in the second direction D2. The valve body 282 faces the seat surface 43c of the seat 43. The valve body 282 is formed, for example, in a substantially hemispherical shape. The shape of the valve body 282 is not limited to this example. The valve body 282 can move in the axial direction integrally with the shaft 281.

The valve body 282 closes the first flow path 81 by abutting on the seat surface 43c of the seat 43. In other words, the valve body 282 abuts on the seat surface 43c to block between the first flow path 81 and the second flow path 250.

On the other hand, the valve body 282 opens the first flow path 81 by separating it from the seat surface 43c, and allows the first flow path 81 to communicate with the second flow path 250. In this way, the valve member 223 can move between the position where the first flow path 81 is closed and the position where the first flow path 81 communicates with the second flow path 250.

The urging member 35 is housed in the third flow path 255 and is located between the bottom surface 255b of the third flow path 255 and the end surface 285b of the first sliding portion 285. The urging member 35 is supported by the bottom surface 255b and the end surface 285b, and is compressed between the bottom surface 255b and the end surface 285b. Therefore, the urging member 35 is supported by the bottom surface 255b and urges the first sliding portion 285 in the first direction D1 by an elastic force.

When the first sliding portion 285 of the shaft 281 urged by the urging member 35 moves in the first direction D1, the valve body 282 and the plunger 222 also move in the first direction D1 integrally with the shaft 281. .. As a result, the valve member 223 is separated from the seat 43.

For example, when the pressure of the W / C 12 is increased by the pump 22, the ECU 15 drives the pump 22 and controls the solenoid valve 211 to a differential pressure state. The ECU 15 generates a magnetic field in the coil 34 by passing an electric current through the coil 34.

The plunger 222 is urged in the second direction D2 toward the seat 43 by the magnetic field generated by the coil 34. The valve member 223 is urged in the second direction D2 by the plunger 222 urged by the magnetic field.

The brake fluid discharged by the pump 22 flows into the first flow path 81 and pushes the valve body 282 of the valve member 223 urged by the magnetic field of the coil 34 in the first direction D1. The brake fluid separates the valve body 282 from the seat surface 43c of the seat 43, passes through the gap between the valve body 282 and the seat surface 43c, and passes from the first flow path 81 to the inner chamber 251 of the second flow path 250. Inflow to.

The valve member 223 moves to a position where the attractive force generated by the magnetic field and the reaction force generated by the brake fluid and the urging member 35 are balanced, and adjusts the degree of opening (valve opening degree) of the first flow path 81. The ECU 15 adjusts the position of the valve member 223 by adjusting the current flowing through the coil 34.

A part of the brake fluid that has flowed into the inner chamber 251 from the first flow path 81 flows toward the reservoir 202 through the through hole 252. On the other hand, when the other part of the brake fluid hits the valve body 282 of the valve member 223, it flows along the valve member 223.

The brake fluid travels through the valve member 223, passes through the gap between the second sliding portion 286 and the inner peripheral surface 256a of the first communication hole 256, and flows into the third flow path 255. The size of the gap between the second sliding portion 286 and the inner peripheral surface 256a of the first communication hole 256 can prevent a large amount of brake fluid from flowing into the third flow path 255. It is set to be smaller than the through hole 252.

In the third flow path 255, the flow of brake fluid may diverge. For example, in the third flow path 255, the brake fluid branches into a flow Fl1 flowing through the valve member 223 and a flow Fl2 toward the second communication hole 262.

The flow of the brake fluid Fl1 flows from the gap flow path 255c of the third flow path 255 into the lateral hole 291 of the second hole 290. A part of the brake fluid may flow into the gap between the outer peripheral surface 285c and the inner peripheral surface 255a.

The flow of brake fluid Fl1 passes from the horizontal hole 291 to the vertical hole 292 of the second hole 290 and the first hole 276 of the plunger 222, and is between the plunger 222 and the bottom surface 44b of the sleeve 44 in the accommodation chamber 258. Reach the inner part 258a of.

Brake fluid flow Fl1 flows from the back portion 258a through at least one of the plurality of grooves 277 to the space 258b between the plunger 222 and the guide 231 in the accommodation chamber 258. In this way, the flow Fl1 of the brake fluid passes through the inner portion 258a and turns back.

The flow of the brake fluid Fl1 flows from the space 258b into the vertical discharge hole 265 of the fourth flow path 261. Even if the groove 277 is separated from the vertical discharge hole 265, the flow Fl1 of the brake fluid can flow into the vertical discharge hole 265 through the space 258b. The flow of the brake fluid Fl1 is discharged from the vertical discharge hole 265 to the merging chamber 267 outside the guide 231 through the horizontal discharge hole 266.

On the other hand, the flow Fl2 of the brake fluid flows from the third flow path 255 through the second communication hole 262 and into the lateral discharge hole 266. The flow Fl2 of the brake fluid merges with the flow Fl1 and is discharged to the merging chamber 267.

As described above, the brake fluid flows Fl1 and Fl2 do not return to the second flow path 250, but are discharged to the outside of the guide 231. Brake fluid flow Fl1 and Fl2 merge with the brake fluid discharged from the through hole 252 in the merging chamber 267 and flow toward the reservoir 202.

When the brake fluid in the inner chamber 251 of the second flow path 250 passes through the through hole 252 or the gap between the second sliding portion 286 and the inner peripheral surface 256a of the first communication hole 256. Pressure loss occurs. Further, the merging chamber 267 is connected to the reservoir 202 through the flow path C. Therefore, the pressure of the brake fluid in the inner chamber 251 is higher than the pressure of the brake fluid in each of the third flow path 255, the accommodation chamber 258, the fourth flow path 261 and the merging chamber 267.

Due to the pressure difference, the brake fluid in the inner chamber 251 passes through the gap between the second sliding portion 286 and the inner peripheral surface 256a of the first communication hole 256, and flows into the third flow path 255. can do. It should be noted that the brake fluid can flow into the third flow path 255 not only by the pressure difference but also by other factors such as the inertia of the brake fluid flowing through the valve member 223 and the Coanda effect.

As mentioned above, the pressure in the containment chamber 258 is lower than the pressure in the inner chamber 251. Further, the brake fluid in the third flow path 255 branches into a flow Fl1 toward the accommodating chamber 258 and a flow Fl2 toward the second communication hole 262. That is, only a part of the brake fluid of the third flow path 255 flows into the accommodation chamber 258. As a result, the solenoid valve 211 can suppress an increase in the pressure in the accommodation chamber 258, and thus can suppress the pressure in the accommodation chamber 258 from urging the valve member 223 in the second direction D2.

Further, as described above, the flow Fl1 of the brake fluid passes through the inner portion 258a of the accommodation chamber 258. Therefore, even if air is present in the inner portion 258a, the flow Fl1 of the brake fluid discharges the air existing in the accommodation chamber 258 to the outside of the guide 231 through the fifth flow path 275 and the fourth flow path 261. can.

The fourth flow path 261 is located above the third flow path 255. Further, at least one of the plurality of grooves 277 is located above the third flow path 255. The air in the containment chamber 258 tends to collect at the upper end of the containment chamber 258 due to buoyancy. Therefore, the flow Fl1 of the brake fluid passing through the groove 277 located above the third flow path 255 and the fourth flow path 261 can discharge the air from the accommodation chamber 258.

As described above, since the air in the accommodation chamber 258 is discharged by the flow Fl1 of the brake fluid, the decrease in the fluid resistance of the brake fluid due to the air is eliminated. Therefore, the solenoid valve 211 can suppress the damping force due to the fluid resistance from being lowered by the air, and can suppress the plunger 222 and the valve member 223 from self-excited vibration.

The brake fluid that has flowed into the third flow path 255 from the first communication hole 256 is discharged to the outside of the guide 231 without returning to the second flow path 250. Therefore, the solenoid valve 211 can prevent the pressure of the second flow path 250 from obstructing the flow Fl1 of the brake fluid that discharges the air in the accommodation chamber 258.

In the brake control device 200 of the second embodiment described above, the housing 221 has a fourth flow path 261 that is separated from the second flow path 250 and the third flow path 255 and communicates with the accommodation chamber 258. In addition to being provided, the plunger 222 is provided with a plurality of fifth flow paths 275 that communicate the first end face 271 and the second end face 272. As a result, the brake fluid that has flowed into the accommodation chamber 258 through the first communication hole 256 and the third flow path 255 passes through at least one of the plurality of fifth flow paths 275 and passes through the accommodation chamber 258. It flows in one direction D1 and flows through the accommodation chamber 258 in the second direction D2 through at least one of the plurality of fifth flow paths 275. Further, the brake fluid can flow into the fourth flow path 261 without returning to the second flow path 250 through the third flow path 255 and the first communication hole 256. Thereby, the solenoid valve 211 can make the pressure of the second flow path 250 different from the pressure of the third flow path 255, the accommodation chamber 258, and the fourth flow path 261. The solenoid valve 211 increases the pressure in the accommodation chamber 258 by lowering the pressure in the third flow path 255, the accommodation chamber 258, and the fourth flow path 261 to be lower than the pressure in the second flow path 250. It becomes easy to adjust the position of the valve member 223. Further, the brake fluid can pass near the first end face 271 of the plunger 222 in the accommodation chamber 258 and be discharged from the fourth flow path 261. Therefore, the solenoid valve 211 can discharge the air in the inner portion 258a of the accommodation chamber 258 to the fourth flow path 261. Therefore, the solenoid valve 211 can suppress the air in the accommodation chamber 258 from lowering the fluid resistance due to the brake fluid in the accommodation chamber 258, and can suppress the valve member 223 and the plunger 222 from causing self-excited vibration due to disturbance.

The second flow path 250 has an inner chamber 251 and a through hole 252. The through hole 252 communicates with the fourth flow path 261 via an external merging chamber 267. The brake fluid causes a pressure loss in the through hole 252 when flowing from the inner chamber 251 to the merging chamber 267, and causes a pressure loss in the first communication hole 256 when flowing from the inner chamber 251 to the third flow path 255. Therefore, the pressure in the inner chamber 251 is higher than the pressure in the third flow path 255, the accommodation chamber 258, and the fourth flow path 261 and is higher than the pressure in the merging chamber 267. Therefore, a part of the brake fluid in the inner chamber 251 flows from the first communication hole 256 to the fourth flow path 261 through the third flow path 255, the accommodation chamber 258, and the fifth flow path 275. As a result, the air in the inner portion 258a of the accommodation chamber 258 can be discharged to the fourth flow path 261.

The plurality of fifth flow paths 275 have a first hole 276 that penetrates the plunger 222 and opens into the first end face 271 and the second end face 272, and is recessed from the side surface 273 and the first end face 271 and the first end face 271 and the first. Includes a groove 277 that opens into the end face 272 of 2. The valve member 223 is provided with a second hole 290 that communicates the third flow path 255 with the first hole 276. For example, the brake fluid flowing in the first direction D1 passes through the second hole 290 and the first hole 276, and the brake fluid flowing in the second direction D2 passes through the groove 277. In this way, the brake fluid can flow in a certain direction in each of the first hole 276 and the groove 277. Therefore, the solenoid valve 211 can generate a stable flow of brake fluid through the third flow path 255, the second hole 290, the first hole 276, the groove 277, and the fourth flow path 261. , The air in the inner portion 258a of the accommodation chamber 258 can be discharged to the fourth flow path 261.

The valve member 223 has an outer peripheral surface 285c and a concave surface 285d recessed from the outer peripheral surface 285c. The second hole 290 opens in the concave surface 285d. As a result, the second hole 290 can be opened to the side of the valve member 223, and the crevice flow leading to the second hole 290 between the inner peripheral surface 255a and the concave surface 285d of the third flow path 255. Road 255c is formed. Therefore, the degree of freedom in designing the second hole 290 is improved.

The housing 221 is provided with a second communication hole 262 that communicates the third flow path 255 and the fourth flow path 261. A part of the brake fluid that has flowed from the second flow path 250 through the first communication hole 256 into the third flow path 255 flows through the fifth flow path 275 to the fourth flow path 261. On the other hand, the other part of the brake fluid flows through the second communication hole 262 to the fourth flow path 261. That is, the solenoid valve 211 can suppress the inflow of a large amount of brake fluid into the accommodation chamber 258, and thus can suppress the increase in the pressure in the accommodation chamber 258.

The third flow path 255 and the fourth flow path 261 are provided in the guide 231. That is, the third flow path 255 and the fourth flow path 261 are provided in one member. As a result, compared to the case where the third flow path 255 and the fourth flow path 261 are formed of a plurality of members, the solenoid valve 211 of the present embodiment can reduce the number of parts and the number of assembly steps, and thus the cost. The increase can be suppressed.

In the above embodiment, the magnetic field generated by the coil 34 urges the plungers 32 and 222 in the second direction D2, and the urging member 35 urges the valve members 33 and 223 in the first direction D1. However, the magnetic field generated by the coil may urge the plunger in the first direction D1 and the urging member may urge the valve member in the second direction D2.

The solenoid valve according to at least one embodiment described above includes, for example, a first flow path, a storage chamber separated from the first flow path in the first direction, and the first flow path. A second flow path located between the accommodation chamber and capable of communicating with the first flow path, an insertion hole communicating with the second flow path and the accommodation chamber, and a separation from the insertion hole. A housing is provided with a first circulation flow path that communicates the second flow path and the accommodation chamber, and has a sheet through which the first flow path opens, and a current is passed through the housing. A coil that generates a magnetic field in, a first end face that faces the first direction, and a second end face that is located on the opposite side of the first end face and faces the second direction opposite to the first direction. A plurality of second circulation channels having an end face and each communicating the first end face and the second end face are provided, located in the accommodation chamber, and the second by the magnetic field. The plunger, which is urged in the direction, is located between the sheet and the plunger inside the housing, passes through the insertion hole, and comes into contact with the sheet to block the first flow path. The valve member and the valve, which are separated from the sheet by communicating the first flow path with the second flow path and being urged in the second direction by the plunger urged by the magnetic field. It includes an urging member that urges the member in the first direction by an elastic force. Thus, as an example, the fluid that has flowed into the containment chamber through the insertion hole flows through the containment chamber in the first direction through at least one of the plurality of second circulation channels and a plurality of second circulation channels. It flows and circulates in the accommodating chamber in the second direction through at least one of the circulation channels of the above. Further, the fluid returns from the accommodating chamber to the second flow path through the first circulation flow path. As a result, the solenoid valve of the present embodiment can prevent the pressure in the accommodating chamber from increasing and causing a pressure difference between the accommodating chamber and the second flow path.

In the solenoid valve, as an example, the housing has an outer cylinder and an inner cylinder fitted inside the outer cylinder, and the insertion hole is provided inside the inner cylinder, and the first The circulation flow path of 1 is provided between the outer cylinder and the inner cylinder. Therefore, as an example, in the solenoid valve of the present embodiment, an insertion hole and a first circulation flow path can be easily provided in the housing.

In the solenoid valve, as an example, the inner cylinder has a support surface for supporting the urging member. Therefore, as an example, the urging member is arranged outside the second flow path. Therefore, the solenoid valve of the present embodiment can suppress the urging member from affecting the flow of the brake fluid in the second flow path.

In the solenoid valve, as an example, the first circulation flow path includes a plurality of holes, each of which communicates with the second flow path and the accommodation chamber and is arranged so as to surround the insertion hole. Therefore, as an example, when the solenoid valve is arranged so that the first flow path is substantially horizontal, at least one of the plurality of holes is located above the insertion hole. As a result, the solenoid valve of the present embodiment can discharge the air raised by the buoyancy in the accommodation chamber to the second flow path through the hole located above the insertion hole.

The solenoid valve according to at least one embodiment described above includes, for example, a first flow path, a storage chamber separated from the first flow path in the first direction, and the first flow path. A second flow path that is located between the accommodation chamber and can communicate with the first flow path, and is located between the second flow path and the accommodation chamber and is communicated with the accommodation chamber. A third flow path, a fourth flow path that is separated from the second flow path and the third flow path and communicates with the accommodation chamber, the second flow path, and the third flow path. A housing having a sheet provided with a first communication hole for communicating with a road and an opening of the first flow path, a coil for generating a magnetic field by passing an electric current, and the first one. It has a first end face facing in a direction and a second end face located on the opposite side of the first end face and facing a second direction opposite to the first direction, each of which is said to be the first. A plurality of fifth flow paths that communicate the end face of the surface and the second end surface are provided, are located in the accommodation chamber, and are urged by the magnetic field in one of the first direction and the second direction. The plunger is located between the sheet and the plunger through the third flow path and the first communication hole, and comes into contact with the sheet to block the first flow path. The valve member and the valve member, which are separated from the sheet to allow the first flow path to communicate with the second flow path and are urged in the second direction by the plunger urged by the magnetic field. The valve member includes an urging member that urges the valve member in the other of the first direction and the second direction. Therefore, as an example, the brake fluid that has flowed into the accommodating chamber through the communication hole and the third flow path flows through the accommodating chamber in the first direction through at least one of the plurality of fifth channels. Together, it flows through the containment chamber in the second direction through at least one of the plurality of fifth channels. Further, the brake fluid can flow into the fourth flow path without returning to the second flow path through the third flow path and the communication hole. Thereby, the solenoid valve can make the pressure of the second flow path different from the pressure of the third flow path, the accommodating chamber, and the fourth flow path. The solenoid valve can suppress an increase in the pressure in the accommodation chamber by lowering the pressure in the third flow path, the accommodation chamber, and the fourth flow path to be lower than the pressure in the second flow path, and thus the valve. It becomes easier to adjust the position of the member. Further, the brake fluid can pass near the first end face of the plunger in the containment chamber and be discharged from the fourth flow path. Therefore, the solenoid valve can discharge the air in the back of the accommodation chamber to the fourth flow path. Therefore, the solenoid valve can suppress the air in the accommodation chamber from lowering the fluid resistance due to the brake fluid in the accommodation chamber, and can suppress the valve member and the plunger from causing self-excited vibration due to disturbance.

In the solenoid valve, as an example, the second flow path has an inner chamber that communicates with the first flow path, and a through hole that communicates the space outside the second flow path and the inner chamber. The first communication hole communicates the inner chamber and the third flow path, and the through hole communicates with the fourth flow path through the external space. Ru. Therefore, as an example, the brake fluid causes a pressure loss in the through hole when flowing from the inner chamber to the external space, and causes a pressure loss in the first communication hole when flowing from the inner chamber to the third flow path. .. Therefore, the pressure in the inner chamber is higher than the pressure in the third flow path, the accommodation chamber, and the fourth flow path, and is higher than the pressure in the external space. Therefore, a part of the brake fluid in the inner chamber can flow from the first communication hole through the third flow path, the accommodating chamber, and the fifth flow path to the fourth flow path, and thus accommodate. The air in the back of the room can be discharged to the fourth flow path.

In the solenoid valve, as an example, the plunger has a side surface that is movable in the first direction and the second direction and is supported by the inner surface of the accommodation chamber, and the plurality of fifth flow paths are provided. A first hole that penetrates the plunger and opens to the first end face and the second end face, and a groove that is recessed from the side surface and opens to the first end face and the second end face. The valve member has a third end face facing the second end face of the plunger, is open to the third end face, and has the third flow path and the first hole. A second hole for communication is provided. Therefore, as an example, the brake fluid having a constant flow direction can flow through the first hole and the groove, respectively. Therefore, the solenoid valve can generate a stable flow of brake fluid through the third flow path, the second hole, the first hole, the groove, and the fourth flow path, and can generate a stable flow of the brake fluid at the back of the accommodation chamber. Air can be discharged to the fourth flow path.

In the solenoid valve, as an example, the valve member has an outer surface that is movably supported by the inner surface of the third flow path in the first direction and the second direction, and a concave surface that is recessed from the outer surface. , And the second hole opens into the concave surface. Therefore, as an example, the second hole can be opened to the side of the valve member, and a flow path leading to the second hole is formed between the inner surface and the concave surface of the third flow path. Therefore, the degree of freedom in designing the second hole is improved.

In the solenoid valve, as an example, the housing is provided with a second communication hole for communicating the third flow path and the fourth flow path. Therefore, as an example, a part of the brake fluid that has flowed from the second flow path through the first communication hole into the third flow path flows through the fifth flow path to the fourth flow path. .. On the other hand, the other part of the brake fluid flows through the second communication hole to the fourth flow path. That is, the solenoid valve can suppress the inflow of a large amount of brake fluid into the accommodation chamber, and thus can suppress the increase in the pressure in the accommodation chamber.

In the solenoid valve, as an example, the housing has a guide to which the sheet is attached, and the third flow path and the fourth flow path are provided in the guide. Therefore, as an example, the third flow path and the fourth flow path are provided in one member. As a result, as compared with the case where the third flow path and the fourth flow path are formed by a plurality of members, for example, the solenoid valve of the present embodiment can reduce the number of parts and the assembly man-hours, and thus suppress the increase in cost. can.

In the brake control device according to at least one embodiment described above, for example, the master cylinder, the wheel cylinder, and the first flow path are the master cylinder and the wheel cylinder through the flow path through which the brake liquid flows. It comprises the solenoid valve, which is connected to one of them and the second flow path is connected to the other of the master cylinder and the wheel cylinder through the flow path. Therefore, as an example, the brake control device of the present embodiment can suppress the occurrence of a pressure difference between the brake fluid in the accommodation chamber and the brake fluid in the second flow path.

In the above description, suppression is defined as, for example, preventing the occurrence of an event, action, or effect, or reducing the degree of event, action, or effect. Further, in the above description, the limitation is defined as, for example, preventing movement or rotation, or allowing movement or rotation within a predetermined range and preventing movement or rotation beyond the predetermined range. ..

Although the embodiments of the present invention have been illustrated above, the above-described embodiments and modifications are merely examples, and the scope of the invention is not intended to be limited. The above-described embodiment and modification can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the gist of the invention. Further, the configuration and shape of each embodiment and each modification can be partially replaced.

10,200 ... Brake control device, 11 ... Master cylinder, 12 ... Wheel cylinder, 21,211 ... Solenoid valve, 31,221 ... Housing, 32,222 ... Plunger, 33,223 ... Valve member, 34 ... Coil, 35 ... Basis member, 41,231 ... Guide (outer cylinder), 42 ... Plate (inner cylinder), 43 ... Sheet, 69 ... Support surface, 70 ... Insertion hole, 75 ... First circulation flow path, 81 ... First Flow path, 82 ... Containment chamber, 85 ... Second flow path, 91,271 ... First end face, 92,272 ... Second end face, 95 ... Second circulation flow path, 250 ... Second flow Road, 251 ... Inner chamber, 252 ... Through hole, 255 ... Third flow path, 255a ... Inner peripheral surface (inner surface), 256 ... First communication hole, 258 ... Containment chamber, 261 ... Fourth flow path , 262 ... second communication hole, 267 ... confluence chamber (external space), 273 ... side surface, 275 ... fifth flow path, 276 ... first hole, 277 ... groove, 282 ... valve body (third) End face), 285a ... End face (third end face), 285c ... Outer surface (outer surface), 285d ... Concave surface, 290 ... Second hole, D1 ... First direction, D2 ... Second direction, C ... Flow path ..

Claims (11)

The first flow path, the accommodating chamber separated from the first flow path in the first direction, and located between the first flow path and the accommodating chamber and communicate with the first flow path. A possible second flow path, an insertion hole that communicates the second flow path and the accommodation chamber, and a first that is separated from the insertion hole and communicates with the second flow path and the accommodation chamber. A housing and a housing provided with a circulation flow path of the above and having a sheet through which the first flow path is opened.
A coil that generates a magnetic field by passing an electric current,
It has a first end face facing the first direction and a second end face located on the opposite side of the first end face and facing the second direction opposite to the first direction, respectively. A plunger, which is provided with a plurality of second circulation channels communicating the first end face and the second end face, is located in the accommodation chamber, and is urged by the magnetic field.
The second flow path is located inside the housing, is located between the sheet and the plunger, passes through the insertion hole, and comes into contact with the sheet to block the first flow path and separate from the sheet. A valve member that allows the first flow path to communicate with the flow path and is urged in the second direction by the plunger urged by the magnetic field.
An urging member that urges the valve member in the first direction by an elastic force, and a urging member.
Solenoid valve equipped with. The housing has an outer cylinder and an inner cylinder fitted inside the outer cylinder.
The insertion hole is provided inside the inner cylinder and is provided.
The first circulation flow path is provided between the outer cylinder and the inner cylinder.
The solenoid valve of claim 1. The solenoid valve according to claim 2, wherein the inner cylinder has a support surface for supporting the urging member. Claim 1 to claim 3, wherein the first circulation flow path includes a plurality of holes, each of which communicates with the second flow path and the accommodation chamber and is arranged so as to surround the insertion hole. Any one solenoid valve. The first flow path, the accommodating chamber separated from the first flow path in the first direction, and located between the first flow path and the accommodating chamber and communicate with the first flow path. A possible second flow path, a third flow path located between the second flow path and the containment chamber and communicated with the containment chamber, the second flow path and the third flow path. A fourth flow path that is separated from the flow path of the above and communicates with the accommodation chamber, and a first communication hole that communicates with the second flow path and the third flow path are provided. A housing having a sheet in which the flow path of 1 is open, and
A coil that generates a magnetic field by passing an electric current,
It has a first end face facing the first direction and a second end face located on the opposite side of the first end face and facing the second direction opposite to the first direction, respectively. Is provided with a plurality of fifth flow paths communicating the first end face and the second end face, is located in the accommodation chamber, and is located in the accommodation chamber, and is located in the first direction and the second direction by the magnetic field. Plunger, which is urged to one side,
It is located between the sheet and the plunger through the third flow path and the first communication hole, and by contacting the sheet, the first flow path is blocked and separated from the sheet. The valve member, which allows the first flow path to communicate with the second flow path and is urged in the second direction by the plunger urged by the magnetic field.
An urging member that urges the valve member to the other of the first direction and the second direction,
Solenoid valve equipped with. The second flow path has an inner chamber that can communicate with the first flow path, and a through hole that communicates the space outside the second flow path and the inner chamber.
The first communication hole communicates the inner chamber with the third flow path.
The through hole communicates with the fourth flow path through the external space.
The solenoid valve of claim 5. The plunger has a side surface that is movable in the first direction and the second direction and is supported by the inner surface of the storage chamber.
The plurality of fifth flow paths have a first hole that penetrates the plunger and opens into the first end face and the second end face, a recess from the side surface, and the first end face and the first end face. Includes a groove that opens into the end face of 2.
The valve member has a third end face facing the second end face of the plunger, a second end face that opens to the third end face and communicates the third flow path with the first hole. The hole was provided,
The solenoid valve of claim 5 or claim 6. The valve member has an outer surface movably supported by the inner surface of the third flow path in the first direction and the second direction, and a concave surface recessed from the outer surface.
The second hole opens in the concave surface.
The solenoid valve of claim 7. The solenoid valve according to any one of claims 5 to 8, wherein the housing is provided with a second communication hole for communicating the third flow path and the fourth flow path. The housing has a guide to which the seat is attached.
The third flow path and the fourth flow path are provided in the guide.
A solenoid valve according to any one of claims 5 to 9. With the master cylinder
Wheel cylinder and
The first flow path is connected to one of the master cylinder and the wheel cylinder through the flow path through which the brake liquid flows, and the second flow path is the master cylinder and the wheel cylinder through the flow path. A solenoid valve of any one of claims 1 to 10 connected to the other.
Brake control device.

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