JP2023125931A - Solenoid valve and brake control device - Google Patents

Abstract

To provide, for example, a solenoid valve that can restrain sliding resistance from occurring in a valve element.SOLUTION: For example, a solenoid valve according to an embodiment comprises: a case comprising a seat; a coil; a plunger separated from the seat, and comprising a first surface facing the seat, and provided with a concave part; a valve element comprising a fitting part housed in the concave part, and supported by the plunger, and a shaft part extending in a second direction from the fitting part, located between the seat and the plunger, and biased by the plunger biased by a magnetic field; and a biasing member biasing the valve element by an elastic force. The case comprises a first inner surface surrounding the shaft part, and a second inner surface surrounding the plunger. The plunger comprises a third inner surface provided in the concave part, and surrounding the fitting part. A first gap between the first inner surface and the shaft part is larger than a second gap between the second inner surface and the plunger.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to a solenoid valve and a brake control device.

In conventional brake control devices, a solenoid valve attracts a plunger with a magnetic field generated by an energized coil. For example, the plunger attracted by the magnetic field pushes the valve body in a direction in which the flow path is closed. Further, for example, a spring pushes the valve body in the direction in which the flow path opens (Patent Document 1).

Japanese Patent Application Publication No. 2013-210049

However, in the conventional configuration, the valve body moves while being guided by, for example, the inner surface of the casing. Therefore, there is a possibility that frictional resistance (sliding resistance) may occur between the valve body and the surface that guides the movement of the valve body.

Therefore, the present invention has been made in view of the above, and provides an electromagnetic valve and a brake control device that can suppress the occurrence of sliding resistance in a valve body.

As an example, a solenoid valve according to an embodiment of the present invention includes a casing having a sheet provided with a flow path, a coil that generates a magnetic field by passing an electric current, and a casing that is spaced apart from the sheet in a first direction. a plunger, the plunger being housed in the housing at a position, biased in a second direction opposite the first direction by the magnetic field, having a first surface facing the seat and provided with a recess; , a fitting portion at least partially accommodated in the recess and supported by the plunger; a shaft portion extending from the fitting portion in the second direction; and an end of the shaft portion in the second direction. and a second surface provided in the fitting part and extending from the shaft part in a direction intersecting the first direction, and the seat and the plunger a closed position in which the abutting part contacts the sheet and closes the flow path, and an open position in which the contact part is separated from the sheet and opens the flow path. a valve body that is movable between the valve body and is urged toward the closed position by the plunger that is biased by the magnetic field; a biasing member that biases in a direction perpendicular to the first direction; the housing includes a first inner surface surrounding the shaft in a direction perpendicular to the first direction; and a second inner surface surrounding the plunger, the plunger being provided in the recess and surrounding the fitting portion in a direction perpendicular to the first direction, and a second inner surface surrounding the plunger in a direction perpendicular to the first direction. a component located between the first inner surface and the first inner surface and the shaft portion, the component having a third inner surface that restricts movement of the fitting portion in the direction of A first gap between the one closer to the shank and the shank is larger than a second gap between the second inner surface and the plunger. Thus, as an example, even if the plunger abuts the second inner surface, the shaft remains spaced apart from the first inner surface and the component. Therefore, the solenoid valve can suppress frictional resistance (sliding resistance) between the shaft portion and the first inner surface or component when the valve body moves between the closed position and the open position. .

FIG. 1 is a sectional view showing a brake control device according to a first embodiment. FIG. 2 is a sectional view showing a part of the solenoid valve of the first embodiment. FIG. 3 is a perspective view showing the yoke of the first embodiment. FIG. 4 is a plan view showing the yoke before bending according to the first embodiment. FIG. 5 is a sectional view showing a part of the solenoid valve according to the second embodiment.

(First embodiment)
A first embodiment will be described below with reference to FIGS. 1 to 4. Note that, in this specification, a constituent element according to an embodiment and a description of the element may be described using a plurality of expressions. The components and their descriptions are examples and are not limited by the language in this specification. Components may also be identified by different names than herein. Also, components may be described using language that differs from that used herein.

FIG. 1 is a sectional view showing a brake control device 10 according to the first embodiment. The brake control device 10 is mounted on a vehicle 1 such as an automobile. Note that 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) 14. Note that the brake control device 10 is not limited to this example.

A brake flow path 15 through which 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 brake flow path 15, and controls the pressure of 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 increase control valve, a pressure decrease control valve, a reservoir, a check valve, and a fixed displacement damper. The electromagnetic valve 21 is not limited to a differential pressure control valve, but may be a pressure increase control valve, a pressure decrease control valve, or another valve.

The electromagnetic valve 21 is provided between the M/C 11 and the W/C 12 in the path of the brake flow path 15 . Note that the brake flow path 15 may have a flow path that bypasses the electromagnetic valve 21. The electromagnetic valve 21 includes a housing 31 , a plunger 32 , a valve body 33 , a coil 34 , a spool 35 , a yoke 36 , and a biasing member 37 .

The solenoid valve 21 can be controlled, for example, into a communication state and a differential pressure state. In normal times when the driver operates the brake pedal of the vehicle 1, the electromagnetic valve 21 is in a communicating state with no current flowing through the coil 34. On the other hand, in the electromagnetic valve 21, when a current is passed through the coil 34, the plunger 32 and the valve body 33 are urged in the valve closing direction by the magnetic field generated by the coil 34. Thereby, the electromagnetic valve 21 functions like a relief valve and enters a differential pressure state.

The differential pressure value generated by the solenoid valve 21 changes depending on 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, for example, in proportion to the current value.

The solenoid valve 21 in the differential state has a brake fluid pressure (hereinafter referred to as W/C pressure) at a portion connected to the W/C 12 via the brake flow path 15 (hereinafter referred to as the W/C 12 side). , when the brake fluid pressure (hereinafter referred to as M/C pressure) at the part connected to the M/C 11 via the brake flow path 15 (hereinafter referred to as the M/C 11 side) becomes higher than a predetermined value or more. Then, brake fluid is made to flow from the W/C 12 side to the M/C 11 side. Therefore, the solenoid valve 21 in the differential state maintains the W/C pressure so that it does not become higher than the M/C pressure by a predetermined value.

The electromagnetic valve 21 may be provided with a check valve that allows the brake fluid to flow from the M/C 11 side to the W/C 12 side. The check valve allows the M/C pressure to be transmitted to the W/C 12 when the driver depresses the brake pedal.

The structure of the solenoid valve 21 will be described in detail below. The housing 31 includes a base 41, a sheet 42, a sleeve 43, and a filter 44. That is, the base 41, the sheet 42, the sleeve 43, and the filter 44 are provided in the housing 31.

The base 41 is made of a magnetic material such as metal. The base 41 is formed into a substantially cylindrical shape extending along the central axis Ax. The central axis Ax passes approximately through the center of the base 41 and extends in the longitudinal direction of the base 41. Note that the central axis Ax may be offset from the center of the base 41.

In this specification, axial direction, radial direction, and circumferential direction are defined for convenience. The axial direction is a direction along the central axis Ax. The radial direction is a direction perpendicular to the central axis Ax. The circumferential direction is the direction of rotation around the central axis Ax. The axial direction is approximately equal to the longitudinal direction of the base 41.

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

An inner hole 50 is provided inside the substantially cylindrical base 41 . The inner hole 50 extends along the central axis Ax and passes through the base 41 in the axial direction. Therefore, the inner hole 50 is open to the end surface 41a of the base 41 in the first direction D1 and the end surface 41b of the base 41 in the second direction D2. The end surface 41a is an example of the third surface.

The inner hole 50 has a first insertion hole 51 , a second insertion hole 52 , and a third insertion hole 53 . The first insertion hole 51 , the second insertion hole 52 , and the third insertion hole 53 are each part of the inner hole 50 . The first insertion hole 51, the second insertion hole 52, and the third insertion hole 53 communicate with each other in the axial direction.

The first insertion hole 51 is open to the end surface 41a of the base 41. The second insertion hole 52 is open to the end surface 41b of the base 41. The third insertion hole 53 is interposed between the first insertion hole 51 and the second insertion hole 52.

Each of the first through hole 51, the second through hole 52, and the third through hole 53, which are perpendicular to the central axis Ax, has a substantially circular cross section, for example. Note that the cross sections of each of the first insertion hole 51, the second insertion hole 52, and the third insertion hole 53 perpendicular to the central axis Ax may have other shapes such as a polygon. The diameter of the third insertion hole 53 is shorter than the diameter of the first insertion hole 51. Furthermore, the diameter of the third insertion hole 53 is smaller than the diameter of the second insertion hole 52.

The base 41 has an inner surface 51a of a first insertion hole 51, an inner surface 52a of a second insertion hole 52, and an inner surface 53a of a third insertion hole 53. The inner surface 52a or the inner surface 53a is an example of the first inner surface.

The inner surface 51a forms (defines, partitions) the first insertion hole 51. The inner surface 52a forms a second insertion hole 52. The inner surface 53a forms a third insertion hole 53. The inner surfaces 51a, 52a, and 53a are formed into a substantially cylindrical shape extending in the axial direction. In other words, the inner surfaces 51a, 52a, and 53a extend in the circumferential direction and face the central axis Ax.

The base 41 further has a support surface 41c. The support surface 41c extends between the inner surface 51a of the first insertion hole 51 and the inner surface 53a of the third insertion hole 53. The support surface 41c is formed in a substantially flat annular shape and faces in the first direction D1. Note that the support surface 41c is not limited to this example.

A groove 55 is provided in the base 41. The groove 55 is provided on the inner surface 52a of the second insertion hole 52. The groove 55 extends substantially in the axial direction between the vicinity of the third insertion hole 53 and the vicinity of the end surface 41b of the base 41.

The sheet 42 is fitted into the second insertion hole 52 at a position spaced apart from the third insertion hole 53 in the second direction D2. Thereby, a space 56 is formed between the seat 42 and the third insertion hole 53 in the axial direction. Space 56 is included in second insertion hole 52 . The groove 55 communicates the space 56 with the outside of the base 41 .

The sheet 42 is made of metal and has a substantially cylindrical shape. A first flow path 61 is provided inside the substantially cylindrical sheet 42 . The first channel 61 is an example of a channel. The first flow path 61 penetrates the sheet 42 in the axial direction along the central axis Ax. Therefore, the first flow path 61 and the inner hole 50 are arranged concentrically (coaxially).

The first flow path 61 opens to an end surface 42a of the sheet 42 in the first direction D1 and an end surface 42b of the sheet 42 in the second direction D2. The end surface 42 a faces the space 56 and the third insertion hole 53 . End surface 42b is located on the opposite side of end surface 42a. The first flow path 61 can communicate with the space 56 .

The first flow path 61 is provided with an orifice 61a. The orifice 61a is a portion whose cross section perpendicular to the central axis Ax is smaller than other portions of the first flow path 61. Further, the seat 42 has a substantially conical seat surface 42c that tapers from the end surface 42a toward the orifice 61a.

The sleeve 43 is opened in the second direction D2 and has a substantially cylindrical shape with a bottom. The sleeve 43 is made of, for example, a non-magnetic metal such as stainless steel. Note that the sleeve 43 is not limited to this example.

A portion of the base 41 including the end surface 41a is housed inside the sleeve 43. Sleeve 43 is secured to base 41 by welding or other means. Thereby, a storage chamber 62 that communicates with the first insertion hole 51 of the base 41 is provided inside the sleeve 43 .

The sleeve 43 has an inner peripheral surface 43a and a bottom surface 43b. The inner peripheral surface 43a is an example of the second inner surface. The inner circumferential surface 43a is formed into a substantially cylindrical shape extending in the axial direction, and faces the central axis Ax. A portion of the inner peripheral surface 43a is fixed to the base 41, for example, by welding. The bottom surface 43b is a substantially hemispherical surface facing the end surface 41a of the base 41. Note that the shapes of the inner peripheral surface 43a and the bottom surface 43b are not limited to this example.

The inner peripheral surface 43a, the bottom surface 43b, and the end surface 41a of the base 41 form the storage chamber 62. Note that the accommodation chamber 62 is not limited to this example. The inner peripheral surface 43a, the bottom surface 43b, and the end surface 41a of the base 41 face toward the inside of the storage chamber 62.

The filter 44 is formed into a substantially cylindrical shape extending in the axial direction. For example, a portion of the base 41 including the end surface 41b is fitted into the filter 44. The filter 44 can collect foreign matter that passes through the filter 44 .

An internal flow path 15v through which brake fluid flows is provided inside the casing 31 described above. The internal flow path 15v includes the above-described first flow path 61 and second flow path 65. The second flow path 65 includes a groove 55 and a space 56. Therefore, the first flow path 61 and the second flow path 65 can communicate with each other.

The internal flow path 15v is connected to the M/C 11 and the W/C 12 through the brake flow path 15. The first flow path 61 is connected to the W/C 12 through the brake flow path 15. Furthermore, the first flow path 61 is connected to the pump 22 through the brake flow path 15 . The second flow path 65 is connected to the M/C 11 through the brake flow path 15. In this way, the first flow path 61 is on the W/C 12 side of the internal flow path 15v, and the second flow path 65 is on the M/C 11 side of the internal flow path 15v. The filter 44 is provided between the internal flow path 15v and the M/C 11.

The plunger 32 is made of a magnetic material such as metal, and has a substantially cylindrical shape extending along the central axis Ax. The plunger 32 is housed in the housing chamber 62 of the sleeve 43. Therefore, the plunger 32 is housed in the housing 31 at a position spaced apart from the seat 42 in the first direction D1. Plunger 32 has a side surface 32a, an end surface 32b, and an end surface 32c. The end surface 32b is an example of a first surface.

The side surface 32a is a substantially cylindrical surface extending in the axial direction. Note that the center of the side surface 32a may be slightly shifted from the central axis Ax. The side surface 32a faces the inner peripheral surface 43a of the sleeve 43. The diameter of the side surface 32a is slightly smaller than the diameter of the inner peripheral surface 43a of the sleeve 43.

The inner peripheral surface 43a surrounds the plunger 32 in a direction perpendicular to the axial direction (first direction D1 and second direction D2). In other words, the inner peripheral surface 43a surrounds the plunger 32 when viewed in the axial direction.

The side surface 32a of the plunger 32 is supported by the inner circumferential surface 43a of the sleeve 43 so as to be movable in the axial direction with respect to the housing 31. In other words, the plunger 32 is guided in the axial direction by the inner peripheral surface 43a of the sleeve 43.

For example, the inner circumferential surface 43a of the sleeve 43 limits movement of the plunger 32 in the radial direction by abutting a part of the side surface 32a. Furthermore, the inner peripheral surface 43a is slightly spaced apart from the other part of the side surface 32a, thereby allowing the plunger 32 to move smoothly in the axial direction.

The end surface 32b is the end surface of the plunger 32 in the second direction D2. Note that the end surface 32b is not limited to this example. For example, the plunger 32 may have a portion protruding from the end surface 32b in the second direction D2.

The end surface 32b is formed substantially flat and faces in the second direction D2. Note that the end surface 32b is not limited to this example, and may have other shapes. The end surface 32b faces the end surface 41a of the base 41 with a gap therebetween. Further, the end surface 32b faces the end surface 42a of the sheet 42 via the base 41.

End surface 32c is located on the opposite side of end surface 32b. The end surface 32c is an end surface of the plunger 32 in the first direction D1. Note that the end surface 32c is not limited to this example. The end surface 32c faces the bottom surface 43b of the sleeve 43.

FIG. 2 is a sectional view showing a part of the electromagnetic valve 21 of the first embodiment. As shown in FIG. 2, the plunger 32 is provided with a recess 71. The recess 71 is provided in the end surface 32b. The recess 71 is a substantially cylindrical depression that opens in the end surface 32b. Note that the shape of the recess 71 is not limited to this example.

The plunger 32 has a bottom surface 71a of the recess 71, an inner circumferential surface 71b, and a corner portion 71c. The bottom surface 71a is an example of a first plane. The inner circumferential surface 71b is an example of the third inner surface. The corner portion 71c is an example of a curved surface.

The bottom surface 71a is provided at the end of the recess 71 in the first direction D1. Note that the bottom surface 71a is not limited to this example. For example, the plunger 32 may have a recessed portion in the first direction D1 from the bottom surface 71a. The bottom surface 71a is formed substantially flat and faces in the second direction D2. Note that by tilting the plunger 32, the bottom surface 71a may face in a direction tilted with respect to the second direction D2.

The inner peripheral surface 71b is provided in the recess 71 between the bottom surface 71a and the end surface 32b of the plunger 32. The inner circumferential surface 71b is formed in a substantially cylindrical shape extending in the axial direction, and faces the central axis Ax. Note that the inner circumferential surface 71b does not necessarily have to extend in the axial direction (parallel to the axial direction) as long as the movement of the valve body 33 in the radial direction can be restricted. The corner portion 71c is a portion where the bottom surface 71a and the inner peripheral surface 71b are connected, and is a curved surface extending between the bottom surface 71a and the inner peripheral surface 71b.

The valve body 33 is made of a non-magnetic material such as synthetic resin, for example. The valve body 33 is located between the seat 42 and the plunger 32 and is housed in the housing 31. The valve body 33 is movable in the axial direction with respect to the seat 42. The valve body 33 has a fitting portion 81 and a shaft portion 82 .

The fitting portion 81 is formed into a substantially cylindrical shape extending in the axial direction. The fitting portion 81 is provided at the end of the valve body 33 in the first direction D1. The fitting portion 81 is at least partially accommodated in the recess 71 of the plunger 32 .

In this embodiment, the length (thickness) of the fitting portion 81 in the axial direction is longer than the length (depth) of the recess 71 in the axial direction. By setting the length of the recess 71 in the axial direction to be short (shallow), the dimensional accuracy of the recess 71 is improved, for example, when the recess 71 is formed by cutting.

Since the recess 71 is shallow, a portion of the fitting portion 81 protrudes from the end surface 32b of the plunger 32. In other words, a portion of the fitting portion 81 is located between the end surface 32b of the plunger 32 and the end surface 41a of the base 41 in the axial direction. Note that the fitting portion 81 may be completely accommodated in the recess 71.

The fitting portion 81 has an end surface 81a, a side surface 81b, a corner portion 81c, and a receiving surface 81d. The end surface 81a is an example of a second plane. The corner portion 81c is an example of a slope. The receiving surface 81d is an example of the second surface.

The end surface 81a is provided at the end of the fitting portion 81 in the first direction D1 and at the end of the valve body 33 in the first direction D1. The end surface 81a is formed substantially flat and faces in the first direction D1. Note that by tilting the valve body 33, the end surface 81a may face in a direction tilted with respect to the first direction D1.

The end surface 81a abuts the bottom surface 71a of the recess 71. Therefore, the fitting portion 81 is supported by the plunger 32. Note that the end surface 81a may be temporarily separated from the bottom surface 71a, for example, when the valve body 33 is tilted with respect to the plunger 32.

Since the fitting portion 81 is supported by the plunger 32, the valve body 33 is supported by the plunger 32. The valve body 33 is not fixed to the plunger 32 and can move relative to the plunger 32 at least within a predetermined range. For example, the valve body 33 can move in the second direction D2 relative to the plunger 32. In other words, the valve body 33 is in contact with the plunger 32 so as to be separable from the plunger 32 .

The side surface 81b is formed into a substantially cylindrical shape extending in the axial direction. Note that the center of the side surface 81b may be slightly shifted from the central axis Ax. The side surface 81b faces the inner circumferential surface 71b of the recess 71. The diameter of the side surface 81b is slightly smaller than the diameter of the inner peripheral surface 71b.

The inner circumferential surface 71b of the recess 71 surrounds the fitting portion 81 in a direction perpendicular to the axial direction. The inner circumferential surface 71b comes into contact with the side surface 81b of the fitting part 81, thereby restricting movement of the fitting part 81 in a direction perpendicular to the axial direction. For example, the inner circumferential surface 71b restricts movement of the fitting portion 81 in the radial direction.

The corner portion 81c is a substantially conical slope extending obliquely to the end surface 81a and the side surface 81b between the end surface 81a and the side surface 81b. In other words, the corner portion 81c between the end surface 81a and the side surface 81b is chamfered.

The receiving surface 81d is provided at the end of the fitting portion 81 in the second direction D2. That is, the end surface 81a is located on the opposite side of the receiving surface 81d. The receiving surface 81d is formed substantially flat and faces in the second direction D2. Note that by tilting the valve body 33, the receiving surface 81d may face in a direction tilted with respect to the second direction D2. A radially outer edge of the receiving surface 81d is connected to the side surface 81b.

The shaft portion 82 is formed in a substantially cylindrical shape extending from the receiving surface 81d of the fitting portion 81 in the second direction D2. Shaft 82 is at least partially received within bore 50 . The shaft portion 82 has an outer peripheral surface 82a shown in FIG. 2 and an abutment surface 82b shown in FIG. The contact surface 82b is an example of a contact portion.

The outer circumferential surface 82a shown in FIG. 2 is formed into a substantially cylindrical shape extending in the axial direction. Note that the center of the outer circumferential surface 82a may be slightly shifted from the central axis Ax. The outer peripheral surface 82a faces the inner surfaces 51a, 52a, and 53a of the base 41.

The diameter of the outer peripheral surface 82a is smaller than the diameter of the inner surfaces 51a, 52a, and 53a. Note that the diameter of the portion of the outer circumferential surface 82a located outside the third insertion hole 53 may be larger than the diameter of the inner surface 53a. The inner surfaces 51a, 52a, and 53a face the outer circumferential surface 82a at intervals and surround the shaft portion 82 in a direction perpendicular to the axial direction.

The diameter of the outer peripheral surface 82a is shorter than the diameter of the side surface 81b of the fitting portion 81. Therefore, the fitting portion 81 is formed in a flange shape that extends radially from the end of the shaft portion 82 in the first direction D1.

An end of the outer circumferential surface 82a in the first direction D1 is connected to an edge of the receiving surface 81d on the inside in the radial direction. The receiving surface 81d extends radially outward from the outer circumferential surface 82a. In other words, the receiving surface 81d extends radially outward from the outer peripheral surface 82a. The outer side in the radial direction is an example of a direction intersecting the first direction. Note that the receiving surface 81d may extend from the outer circumferential surface 82a in a direction diagonally intersecting the axial direction (first direction D1).

As shown in FIG. 1, the contact surface 82b is provided at the end of the shaft portion 82 in the second direction D2. The contact surface 82b is formed, for example, into a substantially hemispherical shape. Note that the shape of the contact surface 82b is not limited to this example. The contact surface 82b is located in the space 56 and faces the seat surface 42c of the seat 42.

The valve body 33 supported by the plunger 32 can move in the axial direction integrally with the plunger 32. The valve body 33 is movable in the axial direction between a closed position Pc and an open position Po. FIG. 1 shows the valve body 33 in the open position Po. FIG. 2 shows the valve body 33 located in the closed position Pc.

When the valve body 33 is located in the closed position Pc, the contact surface 82b closes the first flow path 61 by contacting the seat surface 42c of the seat 42. In other words, when the valve body 33 is located in the closed position Pc, the contact surface 82b contacts the seat surface 42c, thereby blocking the first flow path 61 and the second flow path 65.

When the valve body 33 is located at the open position Po, the contact surface 82b is separated from the seating surface 42c of the seat 42. Thereby, the valve body 33 opens the first flow path 61 and allows the first flow path 61 to communicate with the second flow path 65 .

As shown in FIG. 1, the coil 34 is, for example, a solenoid wound around the central axis Ax. The coil 34 is located outside the sleeve 43 and surrounds the sleeve 43. The coil 34 generates a magnetic field by passing a current through it. ECU 14 controls the current flowing to coil 34.

The spool 35 is made of, for example, a non-magnetic material such as resin, and has a substantially cylindrical shape. Coil 34 is housed in spool 35. A sleeve 43 is inserted inside the spool 35.

FIG. 3 is a perspective view showing the yoke 36 of the first embodiment. FIG. 4 is a plan view showing the yoke 36 before bending according to the first embodiment. The yoke 36 is made by bending a magnetic plate such as metal. The yoke 36 has a first mounting portion 91 , a second mounting portion 92 , a connecting portion 93 , and two magnetic path portions 94 .

As shown in FIG. 3, each of the first attachment part 91 and the second attachment part 92 is formed in a plate shape substantially perpendicular to the axial direction. The second attachment part 92 is arranged at a position spaced apart from the first attachment part 91 in the second direction D2.

A first hole 95 is provided in the first mounting portion 91 . The first hole 95 is a substantially circular hole that passes through the first mounting portion 91 in the axial direction. A second hole 96 is provided in the second mounting portion 92 . The second hole 96 is a substantially circular hole that passes through the second mounting portion 92 in the axial direction. The first hole 95 and the second hole 96 are arranged concentrically (coaxially).

As shown in FIG. 1, the coil 34 and the spool 35 are arranged between the first attachment part 91 and the second attachment part 92. The sleeve 43 is fitted into the first hole 95. The base 41 is fitted into the second hole 96. Thereby, the yoke 36 is attached to the housing 31 and holds the coil 34 and the spool 35.

The connecting portion 93 extends substantially axially along the coil 34 . As shown in FIG. 3, the end 93a of the connecting portion 93 in the first direction D1 is connected to the outer edge of the first attachment portion 91. An end 93b of the connecting portion 93 in the second direction D2 is connected to the outer edge of the second attachment portion 92.

As shown in FIG. 4, each of the width W1 of the first attachment part 91 and the width W2 of the second attachment part 92 is wider than the width W3 of the connection part 93. The width W3 is the maximum width of the connecting portion 93 in a direction (width direction) perpendicular to the axial direction and perpendicular to the thickness of the connecting portion 93. The width W1 is the maximum width of the first attachment portion 91 in the width direction. The width W2 is the maximum width of the second attachment portion 92 in the width direction.

The first attachment portion 91 has a constricted portion 91a that tapers toward the connecting portion 93. Similarly, the second mounting portion 92 has a constricted portion 92a that tapers toward the connecting portion 93. The edges of the constricted portions 91a and 92a are located on the outer side of the coil 34 in the radial direction.

Both ends 93c of the connecting portion 93 in the circumferential direction are connected to the magnetic path portion 94. In other words, the magnetic path portion 94 extends from the end portion 93c of the connecting portion 93 in a direction intersecting the axial direction. On the other hand, the magnetic path section 94 is not directly connected to the first attachment section 91 and the second attachment section 92. Note that the magnetic path portion 94 may be connected to the first attachment portion 91 and the second attachment portion 92 by, for example, welding or brazing.

As shown in FIG. 3, the end 94a of the magnetic path section 94 in the first direction D1 extends along the edge of the constricted section 91a. Therefore, the end portion 94a is arranged near the edge of the constricted portion 91a. The edge of the constricted portion 91a is a part of the outer edge of the first attachment portion 91.

Furthermore, the end portion 94b of the magnetic path portion 94 in the second direction D2 extends along the edge of the constricted portion 92a. Therefore, the end portion 94b is arranged near the edge of the constricted portion 92a. The edge of the constricted portion 92a is a part of the outer edge of the second attachment portion 92.

As mentioned above, the yoke 36 is made by bending a magnetic plate as shown in FIG. The first attachment portion 91 and the second attachment portion 92 are bent relative to the connection portion 93 at the ends 93a, 93b of the connection portion 93. Compressive stress or tensile stress is generated in the first attachment part 91 and the second attachment part 92 by bending.

Generally, the stress generated in the first attachment part 91 and the second attachment part 92 may affect the shapes of the first hole 95 and the second hole 96. However, the first attachment part 91 and the second attachment part 92 of this embodiment are connected to the connection part 93 at the edges of the throttle parts 91a and 92a. Therefore, when the first attachment part 91 and the second attachment part 92 are bent with respect to the connecting part 93, the stress generated in the first attachment part 91 and the second attachment part 92 is reduced, and the stress generated in the first attachment part 91 and the second attachment part 92 is reduced. The shapes of the hole 95 and the second hole 96 are maintained. That is, the yoke 36 of this embodiment can suppress the deterioration of the roundness of the first hole 95 and the second hole 96 due to bending.

The magnetic path portion 94 is bent with respect to the connecting portion 93 at the end portion 93c of the connecting portion 93. Bending generates stress in the connecting portion 93 and the magnetic path portion 94. However, since the magnetic path section 94 is not directly connected to the first attachment section 91 and the second attachment section 92, the bending of the magnetic path section 94 causes the first attachment section 91 and the second attachment section 92 to be connected to each other. Generation of stress in the portion 92 can be suppressed.

As shown in FIG. 2, the biasing member 37 is, for example, a coil spring wound around the central axis Ax. Note that the biasing member 37 may be another elastic body. The biasing member 37 is accommodated in the first insertion hole 51 .

A shaft portion 82 extends through the inside of the biasing member 37 . The inner diameter of the biasing member 37 is longer than the diameter of the outer peripheral surface 82a of the shaft portion 82. The biasing member 37 is located between the inner surface 51a of the first insertion hole 51 and the outer peripheral surface 82a of the shaft portion 82 in the radial direction. The biasing member 37 is spaced apart from the inner surface 51a and the outer peripheral surface 82a.

The biasing member 37 is located between the support surface 41c of the base 41 and the receiving surface 81d of the fitting portion 81. The biasing member 37 is supported by the support surface 41c and the receiving surface 81d, and is compressed between the supporting surface 41c and the receiving surface 81d. Therefore, the biasing member 37 is supported by the support surface 41c and biases the valve body 33 in the first direction D1 by elastic force.

The biasing member 37 and the corner portion 81c of the fitting portion 81 overlap in the axial direction. In other words, the corner portion 81c is provided at a position spaced apart from the biasing member 37 in the first direction D1. Note that the biasing member 37 may overlap the end surface 81a in the axial direction.

The biasing member 37 is not limited to the support surface 41c, and may be supported, for example, on the end surface 42a of the sheet 42. In this case, for example, the first insertion hole 51 and the second insertion hole 52 communicate directly, the third insertion hole 53 is omitted, and the biasing member 37 is supported by the end surface 42a and the receiving surface 81d. be done.

When the valve body 33 urged by the urging member 37 moves in the first direction D1, the plunger 32 also moves integrally with the valve body 33 in the first direction D1. This causes the contact surface 82b to separate from the sheet 42. That is, the biasing member 37 biases the valve body 33 toward the open position Po with elastic force.

As shown in FIG. 1, when the valve body 33 moves to the open position Po, the end surface 32c of the plunger 32 comes into contact with the bottom surface 43b of the sleeve 43. The bottom surface 43b supports the plunger 32 and restricts the plunger 32 from further separating from the seat 42 when the valve body 33 is located in the open position Po.

The ECU 14 can control the W/C pressure generated in each W/C 12 by controlling the solenoid valve 21 and the pump 22. Under normal conditions, the ECU 14 does not apply current to the coil 34. The valve body 33 is biased by the biasing member 37 and located at the open position Po. As a result, the contact surface 82b of the valve body 33 is separated from the seating surface 42c of the seat 42, and the solenoid valve 21 is brought into communication.

In the solenoid valve 21 in the communicating state, the first flow path 61 communicates with the second flow path 65 . In other words, the solenoid valve 21 opens, and the brake flow path 15 on the M/C 11 side and the brake flow path 15 on the W/C 12 side communicate with each other. Therefore, brake fluid can flow between the M/C 11 side and the W/C 12 side.

When the brake pedal of the vehicle 1 is depressed, brake fluid flows from the M/C 11 to the W/C 12 through the first flow path 61. 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 61.

On the other hand, when increasing the pressure of the W/C 12 using the pump 22, the ECU 14 drives the pump 22 and controls the solenoid valve 21 to a differential pressure state. The ECU 14 causes the coil 34 to generate a magnetic field by passing a current through the coil 34.

The coil 34 generates a magnetic field to attract the plunger 32 in the second direction D2 by electromagnetic force. In other words, the plunger 32 is urged in the second direction D2 by the magnetic field generated by the coil 34.

As shown in FIG. 2, the end surface 41a of the base 41 and the end surface 32b of the plunger 32 face each other. Note that the end surface 41a and the receiving surface 81d of the fitting portion 81 may face each other. When the coil 34 generates a magnetic field, magnetic flux passes through the end surface 41a and the end surface 32b. Thereby, the plunger 32 is attracted to the end surface 41a.

The magnetic flux also passes through the yoke 36. For example, a portion of the magnetic flux flows from the first attachment portion 91 to the second attachment portion 92 through the connection portion 93 . Further, another part of the magnetic flux flows from the first attachment portion 91 to the second attachment portion 92 through the magnetic path portion 94 .

The magnetic flux passes through the edge of the constricted portion 91a and the end 94a of the magnetic path portion 94 adjacent to the edge, and flows from the first attachment portion 91 to the magnetic path portion 94. Further, the magnetic flux passes through the end 94b of the magnetic path portion 94 and the edge of the constriction portion 92a adjacent to the end 94b, and flows from the magnetic path portion 94 to the second attachment portion 92. Note that the magnetic flux may flow from the second attachment portion 92 to the first attachment portion 91 through the connection portion 93 and the magnetic path portion 94.

The plunger 32 attracted by the magnetic field pushes the valve body 33 in the second direction D2 and brings the contact surface 82b closer to the seat surface 42c of the seat 42. In this way, the valve body 33 is urged toward the closed position Pc by the plunger 32 that is urged by the magnetic field.

The brake fluid discharged by the pump 22 flows into the first flow path 61 from the brake flow path 15 on the W/C 12 side. The brake fluid is ejected from the first flow path 61 toward the contact surface 82b of the valve body 33.

The brake fluid pushes the contact surface 82b of the valve body 33, which is energized by the magnetic field of the coil 34, in the first direction D1. The brake fluid separates the contact surface 82b from the seat surface 42c of the seat 42, passes through the gap between the contact surface 82b and the seat surface 42c, and flows from the first flow path 61 to the space of the second flow path 65. 56. In this way, the pump 22 causes the brake fluid to flow from the first flow path 61 to the second flow path 65.

The attractive force generated by the magnetic field biases the valve body 33 in the second direction D2, while the reaction force generated by the brake fluid and the biasing member 37 biases the valve body 33 in the first direction D1. The valve body 33 moves to a position where the suction force and the reaction force are balanced, and adjusts the degree of opening of the first flow path 61 (valve opening degree).

The attractive force changes depending on the current value of the current flowing through the coil 34. Therefore, the ECU 14 adjusts the position of the valve body 33 by adjusting the current flowing through the coil 34. By adjusting the position of the valve body 33, the flow rate of the brake fluid flowing from the first flow path 61 to the second flow path 65 and the pressure in the first flow path 61 and the W/C 12 are adjusted. .

Further, the ECU 14 may control the solenoid valve 21 to be in a closed state. The ECU 14 does not drive the pump 22 but allows current to flow through the coil 34. The coil 34 generates a magnetic field and attracts the plunger 32 in the second direction D2 by electromagnetic force.

The valve body 33 is biased toward the closed position Pc by the plunger 32 biased by the magnetic field. Since the pump 22 does not discharge brake fluid, the plunger 32 moves the valve body 33 to the closed position Pc and closes the first flow path 61 with the contact surface 82b.

As described above, in the electromagnetic valve 21, the valve body 33 is moved between the open position Po and the closed position Pc. Further, the plunger 32 urges the valve body 33 in the second direction D2, or is urged in the first direction D1 by the valve body 33, and moves integrally with the valve body 33.

In this embodiment, the inner surface 53a of the base 41 is closer to the shaft portion 82 than the biasing member 37. The biasing member 37 is an example of a component located between the first inner surface and the shaft portion. A first gap G1 is provided between the inner surface 53a of the base 41 and the outer peripheral surface 82a of the shaft portion 82.

A second gap G2 is provided between the inner peripheral surface 43a of the sleeve 43 and the side surface 32a of the plunger 32. The first gap G1 is larger than the second gap G2. Specifically, the difference between the diameter of the inner surface 53a and the diameter of the outer peripheral surface 82a is larger than the difference between the diameter of the inner peripheral surface 43a and the diameter of the side surface 32a. Note that the difference in diameter in this embodiment is the difference in diameter between two portions arranged at the same position in the axial direction.

The first gap G1, the second gap G2, and the third gap G3 may not be constant in the circumferential direction. In this case, the average value of the distance between the inner surface 53a and the outer circumferential surface 82a in the radial direction is larger than the average value of the distance between the inner circumferential surface 43a and the side surface 32a in the radial direction. Further, the minimum distance between the inner surface 53a and the outer peripheral surface 82a in the radial direction is larger than the minimum distance between the inner peripheral surface 43a and the side surface 32a in the radial direction.

A third gap G3 is provided between the inner circumferential surface 71b of the recess 71 and the side surface 81b of the fitting portion 81. The sum of the second gap G2 and the third gap G3 is smaller than the first gap G1. Specifically, the sum of the difference between the diameter of the inner circumferential surface 43a and the diameter of the side surface 32a, and the difference between the diameter of the inner circumferential surface 71b and the diameter of the side surface 81b is equal to the diameter of the inner circumferential surface 53a and the diameter of the outer circumferential surface 82a. smaller than the difference in diameter.

Furthermore, the sum of the average value of the distance between the inner circumferential surface 43a and the side surface 32a in the radial direction and the average value of the distance between the inner circumferential surface 71b and the side surface 81b in the radial direction is the inner surface in the radial direction. It is smaller than the average value of the distance between 53a and the outer circumferential surface 82a. Further, the sum of the minimum distance between the inner circumferential surface 43a and the side surface 32a in the radial direction and the minimum distance between the inner circumferential surface 71b and the side surface 81b in the radial direction is the same as that of the inner circumferential surface 53a in the radial direction. It is smaller than the minimum distance from the outer circumferential surface 82a.

The plunger 32 and the valve body 33 can be slightly moved in the radial direction with respect to the housing 31. Since the sum of the second gap G2 and the third gap G3 is smaller than the first gap G1, even if the plunger 32 and the valve body 33 move to the maximum in the same direction, the shaft portion 82 It is separated from.

When the valve body 33 is located in the closed position Pc, a fourth gap G4 is provided in the axial direction between the end surface 41a of the base 41 and the receiving surface 81d of the fitting portion 81. That is, the fitting portion 81 is spaced apart from the end surface 41a. Further, when the valve body 33 is located in the closed position Pc, the end surface 32b of the plunger 32 is also spaced apart from the end surface 41a.

As described above, the third gap G3 is provided between the side surface 81b of the fitting portion 81 and the inner circumferential surface 71b of the recessed portion 71. Further, the fitting portion 81 is provided with a chamfered corner portion 81c. Therefore, the recess 71 accommodates the fitting portion 81 such that the valve body 33 can swing around the fitting portion 81 .

As shown by the two-dot chain line in FIG. 2, the plunger 32 may be tilted with respect to the housing 31. In this case, the plunger 32 applies a force to the fitting portion 81 of the valve body 33 to tilt the valve body 33 in substantially the same direction as the plunger 32 . However, since the valve body 33 is swingable around the fitting portion 81, the valve body 33 can be maintained in substantially the same posture.

For example, when the valve body 33 is tilted with respect to the housing 31, the receiving surface 81d of the fitting portion 81 pushes the biasing member 37. The biasing member 37 pressed by the receiving surface 81d pushes the receiving surface 81d by elastic force. The elastic force of the biasing member 37 resists the force of the plunger 32 that causes the valve body 33 to tilt. Therefore, the biasing member 37 can maintain the valve body 33 in substantially the same posture.

Further, when the electromagnetic valve 21 is in a differential pressure state, the brake fluid is ejected from the first flow path 61 toward the contact surface 82b of the valve body 33. By flowing along the contact surface 82b, the brake fluid has an aligning effect on the valve body 33 (so that the center portion of the contact surface 82b of the valve body 33 in the open state faces the center of the orifice 61a). , that is, an action that stabilizes the position of the valve body 33 so that it is disposed on the central axis Ax) while pushing the valve body 33. Therefore, the brake fluid ejected from the first flow path 61 can maintain the valve body 33 in substantially the same posture.

By keeping the valve body 33 in substantially the same posture, the distance between the outer circumferential surface 82a of the shaft portion 82 and the inner surface 53a of the base 41 is kept substantially uniform. Therefore, the shaft portion 82 is kept separated from the inner surface 53a.

By keeping the shaft portion 82 spaced apart from the inner surface 53a, no friction occurs between the shaft portion 82 and the inner surface 53a even if the valve body 33 moves in the axial direction. Although it is preferable that the shaft portion 82 does not contact the inner surface 53a, it may contact the inner surface 53a if, for example, the valve body 33 is tilted with respect to the housing 31. However, in this embodiment, even in such a case, the sizes of the first gap G1, the second gap G2, and the third gap G3 are adjusted so that the shaft portion 82 does not come into contact with the inner surface 53a as much as possible. , the force of the urging member 37 pushing the receiving surface 81d, and the force of the brake fluid ejected from the first flow path 61 pushing the valve body 33 (force related to alignment action) are taken into consideration. Therefore, the friction between the shaft portion 82 and the inner surface 53a can be suitably reduced.

In the brake control device 10 according to the first embodiment described above, the plunger 32 has an end surface 32b, is spaced apart from the seat 42 in the first direction D1, and is moved in the opposite direction of the first direction D1 by a magnetic field. It is biased in the second direction D2. The end surface 32b faces the seat 42 and is provided with a recess 71. The valve body 33 has a fitting portion 81, a shaft portion 82, and a receiving surface 81d. The fitting portion 81 is at least partially accommodated in the recess 71 and supported by the plunger 32 . The shaft portion 82 extends from the fitting portion 81 in the second direction D2. The receiving surface 81d is provided on the fitting portion 81 and extends from the shaft portion 82 in a direction intersecting the first direction D1. The housing 31 has an inner surface 53a surrounding the shaft portion 82 in a direction perpendicular to the first direction D1, and an inner peripheral surface 43a surrounding the plunger 32 in a direction perpendicular to the first direction D1. The plunger 32 is provided in the recess 71, surrounds the fitting part 81 in a direction perpendicular to the first direction D1, and restricts movement of the fitting part 81 in a direction perpendicular to the first direction D1. It has an inner peripheral surface 71b. A first gap G1 between the inner surface 53a and the component (biasing member 37) located between the inner surface 52a and the shaft portion 82, which is closer to the shaft portion 82, and the shaft portion 82 is as follows: It is larger than the second gap G2 between the inner peripheral surface 43a and the plunger 32. Thereby, even if the plunger 32 comes into contact with the inner circumferential surface 43a, the shaft portion 82 remains separated from the inner surface 53a and the components. Therefore, in the electromagnetic valve 21, when the valve body 33 moves between the closed position Pc and the open position Po, frictional resistance (sliding resistance) is generated between the shaft portion 82 and the inner surface 53a or parts. can be suppressed. By suppressing the occurrence of sliding resistance, the electromagnetic valve 21 can smoothly move the valve body 33 in accordance with the current flowing through the coil 34, and the fluid (brake fluid) in the first flow path 61 can be moved smoothly. ) can be stably adjusted and robustness can be improved.

Further, since the valve body 33 is kept separated from the base 41, a portion guided by the base 41 is not necessary. Therefore, in the solenoid valve 21, the length of the valve body 33 in the axial direction can be shortened, and in turn, the length of the solenoid valve 21 in the axial direction can be shortened.

The total of the third gap G3 and the second gap G2 between the inner peripheral surface 71b and the fitting part 81 is smaller than the first gap G1. As a result, even if the plunger 32 contacts the inner circumferential surface 43a and the fitting portion 81 contacts the inner circumferential surface 71b, the shaft portion 82 remains separated from the inner surface 53a and the component. Therefore, the electromagnetic valve 21 can suppress the generation of sliding resistance between the shaft portion 82 and the inner surface 53a or the component when the valve body 33 moves between the closed position Pc and the open position Po.

The housing 31 has an end surface 41a facing the end surface 32b. When the valve body 33 is located in the closed position Pc, a fourth gap G4 is provided between the receiving surface 81d and the end surface 41a. Thereby, the electromagnetic valve 21 can suppress interference between the receiving surface 81d and the end surface 41a. Furthermore, in the electromagnetic valve 21, the end surface 41a can be widened so that the receiving surface 81d and the end surface 41a overlap, and the magnetic flux passing through the end surface 32b and the end surface 41a can be increased.

The recess 71 accommodates the fitting portion 81 so that the valve body 33 can swing around the fitting portion 81 . Thereby, the valve body 33 can maintain the center of the contact surface 82b on the central axis Ax of the first flow path 61 even if the plunger 32 moves in a direction perpendicular to the first direction D1. .

The plunger 32 is provided at the end of the recess 71 in the first direction D1 and has a bottom surface 71a facing in the second direction D2. The fitting portion 81 has an end surface 81a located on the opposite side of the receiving surface 81d and facing in the first direction D1, and a side surface 81b facing the inner circumferential surface 71b. The fitting portion 81 has a corner portion 81c that is a slope. The corner portion 81c extends obliquely between the end surface 81a and the side surface 81b with respect to the end surface 81a and the side surface 81b. Thereby, the posture of the valve body 33 with respect to the plunger 32 is stabilized due to the contact between the bottom surface 71a and the end surface 81a. Further, the corner portion 81c allows the valve body 33 to swing around the fitting portion 81.

The biasing member 37 includes a coil spring supported by the receiving surface 81d. The corner portion 81c is provided at a position spaced apart from the coil spring in the first direction D1. That is, in the direction perpendicular to the first direction D1, the coil spring is arranged closer to the side surface 81b than the end surface 81a. When the plunger 32 is tilted, the plunger 32 pushes the vicinity of the side surface 81b of the fitting portion 81 so as to rotate the valve body 33. However, the coil spring applies a force against the rotation to the valve body 33 near the side surface 81b. Thereby, the coil spring can stabilize the posture of the valve body 33 even if the plunger 32 is tilted.

The brake fluid discharged by the pump 22 is ejected from the first flow path 61 toward the contact surface 82b. Thereby, the brake fluid applies a force to the contact surface 82b so as to keep the center of the contact surface 82b above the central axis Ax of the first flow path 61 (alignment action). Further, the brake fluid pushes the contact surface 82b in the first direction D1. However, in the electromagnetic valve 21, even if the valve body 33 moves in the first direction D1 and the second direction D2, sliding resistance may occur between the shaft portion 82 and the inner surface 53a or components as described above. can be suppressed. Therefore, the electromagnetic valve 21 can smoothly move the valve body 33 according to the current flowing through the coil 34, and can stably adjust the pressure of the brake fluid in the first flow path 61. Robustness can be improved.

The yoke 36 includes a first mounting portion 91 , a second mounting portion 92 , a connecting portion 93 , and a magnetic path portion 94 . The first attachment portion 91 is connected to the end portion 93a of the connecting portion 93 in the first direction D1. The second attachment portion 92 is connected to the end portion 93b of the connecting portion 93 in the second direction D2. The magnetic path portion 94 is connected to the end portion 93c of the connecting portion 93 in a direction intersecting the first direction D1 and the second direction D2. The end 94a of the magnetic path section 94 in the first direction D1 extends along the outer edge of the first attachment section 91. The end portion 94b of the magnetic path portion 94 in the second direction D2 extends along the outer edge of the second attachment portion 92. Thereby, the magnetic flux can pass not only through the connecting portion 93 but also through the magnetic path portion 94 between the first attachment portion 91 and the second attachment portion 92 . That is, the magnetic path section 94 can expand the cross-sectional area of the magnetic path between the first attachment section 91 and the second attachment section 92, and can improve the efficiency of the coil 34 and the yoke 36. Further, since the magnetic path portion 94 is connected to the end portion 93c of the connecting portion 93, bending of the magnetic path portion 94 makes it difficult to generate stress near the first hole 95 or the second hole 96. Therefore, the yoke 36 can suppress distortion of the first hole 95 and the second hole 96 due to bending of the yoke 36.

(Second embodiment)
The second embodiment will be described below with reference to FIG. 5. In the following description of the embodiments, components having the same functions as already described components are given the same reference numerals as the already described components, and further explanation may be omitted. Furthermore, the plurality of components labeled with the same reference numerals do not necessarily have all functions and properties in common, and may have different functions and properties depending on each embodiment.

FIG. 5 is a sectional view showing a part of the electromagnetic valve 121 according to the second embodiment. The solenoid valve 121 of the second embodiment has the same configuration as the solenoid valve 21 of the first embodiment except for the following description.

The plunger 32 of the second embodiment has a corner portion 171c instead of the corner portion 71c of the recess 71. The corner portion 171c is an example of a slope. The corner portion 171c is a portion where the bottom surface 71a and the inner peripheral surface 71b are connected, and has a substantially conical shape extending obliquely to the bottom surface 71a and the inner peripheral surface 71b between the bottom surface 71a and the inner peripheral surface 71b. It is a slope.

The fitting portion 81 of the second embodiment has a corner portion 181c instead of the corner portion 81c. The corner portion 181c is an example of a curved surface. The corner portion 181c is a curved surface extending between the end surface 81a and the side surface 81b. In other words, the corner portion 181c between the end surface 81a and the side surface 81b is rounded. The corner portion 181c is provided at a position spaced apart from the biasing member 37 in the first direction D1.

As described above, the plunger 32 may have the corner portion 71c that is a curved surface, or may have the corner portion 171c that is a slope. Further, the fitting portion 81 may have a corner portion 81c that is a slope, or may have a corner portion 181c that is a curved surface. Further, the corner portions of the recessed portion 71 and the corner portions of the fitting portion 81 do not need to be chamfered.

In the above embodiment, the inner surface 53a of the base 41 is closer to the shaft portion 82 than the biasing member 37. Note that a component such as the biasing member 37 may be closer to the shaft portion 82 than the inner surface of the base 41. In this case, the gap between the component and the shaft portion 82 is larger than the sum of the second gap G2 and the third gap G3.

The electromagnetic valve according to at least one embodiment described above includes, for example, a housing having a sheet provided with a flow path, a coil that generates a magnetic field by passing an electric current, and a first magnetic field from the sheet. a first surface facing the sheet and provided with a concave portion; a plunger, a fitting part that is at least partially housed in the recess and supported by the plunger, a shaft part that extends from the fitting part in the second direction, and a shaft part that extends in the second direction from the fitting part; The sheet has a contact portion provided at an end of the shaft portion, and a second surface provided at the fitting portion and extending from the shaft portion in a direction intersecting the first direction. and the plunger, the abutting portion is located in the housing, and has a closed position where the contact portion contacts the sheet and closes the flow path, and an open position where the contact portion is separated from the sheet and opens the flow path. a valve body supported by the second surface and biased toward the closed position by the plunger biased by the magnetic field; a biasing member that biases the body in the first direction, and the housing includes a first inner surface surrounding the shaft portion in a direction orthogonal to the first direction; a second inner surface surrounding the plunger in a direction perpendicular to the first direction, the plunger being provided in the recess and surrounding the fitting part in a direction perpendicular to the first direction; a component located between the first inner surface and the first inner surface and the shaft portion, the component having a third inner surface that restricts movement of the fitting portion in a direction perpendicular to the direction of A first gap between the one closer to the shank and the shank is larger than a second gap between the second inner surface and the plunger. Thus, as an example, even if the plunger abuts the second inner surface, the shaft remains spaced apart from the first inner surface and the component. Therefore, the solenoid valve can suppress frictional resistance (sliding resistance) between the shaft portion and the first inner surface or component when the valve body moves between the closed position and the open position. . By suppressing the occurrence of sliding resistance, the solenoid valve can smoothly move the valve body in response to the current flowing through the coil, which in turn stabilizes the pressure of the fluid (brake fluid) in the flow path. can be adjusted to improve robustness.

In the above electromagnetic valve, for example, a total of a third gap between the third inner surface and the fitting portion and the second gap is smaller than the first gap. Thus, as an example, even if the plunger abuts the second inner surface and the fitting portion abuts the third inner surface, the shaft remains spaced apart from the first inner surface and the component. Therefore, the electromagnetic valve can suppress the generation of sliding resistance between the shaft portion and the first inner surface or component when the valve body moves between the closed position and the open position.

In the above electromagnetic valve, for example, the housing has a third surface facing the first surface, and when the valve body is located in the closed position, the second surface and the third surface A fourth gap is provided between the surfaces. Therefore, as an example, the electromagnetic valve can suppress interference between the second surface and the third surface. Furthermore, in the solenoid valve, the third surface can be widened so that the second surface and the third surface overlap, and the magnetic flux passing through the first surface and the third surface can be increased. .

In the above electromagnetic valve, for example, the recess accommodates the fitting portion so that the valve body can swing around the fitting portion. Therefore, for example, even if the plunger moves in a direction perpendicular to the first direction, the valve body can maintain the center of the contact portion above the central axis of the flow path.

In the above electromagnetic valve, for example, the plunger is provided at an end of the recess in the first direction and has a first plane facing in the second direction, and the fitting part is arranged at the end of the recess in the first direction. a second plane located opposite to the second plane and facing the first direction; and a side face facing the third inner surface, and one of the plunger and the fitting part has a second plane facing the first direction, and one of the plunger and the fitting part has a The second plane extends obliquely to the first plane and the third inner surface between the first plane and the third inner surface, or the second plane extends between the second plane and the side surface. and a slope extending obliquely to the side surface, or a curved surface extending between the first plane and the third inner surface, or between the second plane and the side surface. . Therefore, for example, the contact between the first plane and the second plane stabilizes the posture of the valve body with respect to the plunger. Furthermore, the sloped or curved surface allows the valve body to swing around the fitting portion.

In the above electromagnetic valve, for example, the biasing member includes a coil spring supported by the second surface, and the slope or the curved surface is located at a position spaced apart from the coil spring in the first direction. provided. Therefore, as an example, the coil spring is arranged at a position closer to the third inner surface or side surface than to the first plane or the second plane in the direction perpendicular to the first direction. When the plunger is tilted, the plunger pushes against the corner of the fitting part to rotate the valve body. However, the coil spring applies a force that resists the rotation to the valve body near the corner portion of the fitting portion. Thereby, the coil spring can stabilize the posture of the valve body even if the plunger is tilted diagonally.

The brake control device according to at least one embodiment described above includes, as an example, the solenoid valve described above and a pump capable of discharging brake fluid, and the brake fluid discharged by the pump is The liquid is ejected from the flow path toward the contact portion. Therefore, as an example, the brake fluid applies a force to the abutting portion so as to keep the center of the abutting portion above the central axis of the flow path. Also, the brake fluid pushes the abutting portion in the first direction. However, even if the valve body moves in the first direction and the second direction, the solenoid valve can suppress the generation of sliding resistance between the shaft portion and the first inner surface or components as described above. . Therefore, the solenoid valve can smoothly move the valve body according to the current flowing through the coil, and can stably adjust the brake fluid pressure in the flow path, improving robustness. can.

In the above description, suppression is defined as, for example, preventing the occurrence of an event, effect, or effect, or reducing the degree of an event, effect, or effect. Furthermore, in the above explanation, restriction 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 embodiments and modifications are merely examples, and are not intended to limit the scope of the invention. The embodiments and modifications described above can be implemented in various other forms, and various omissions, substitutions, combinations, and changes can be made without departing from the gist of the invention. Furthermore, the configurations and shapes of each embodiment and each modification can be partially replaced.

DESCRIPTION OF SYMBOLS 10... Brake control device, 21, 121... Solenoid valve, 22... Pump, 31... Housing, 32... Plunger, 32b... End surface (first surface), 33... Valve body, 34... Coil, 37... Biasing member , 41a... end surface (third surface), 43a... inner circumferential surface (second inner surface), 53a... inner surface (first inner surface), 61... first channel (channel), 71... recess, 71a ...bottom surface (first plane), 71b...inner peripheral surface (third inner surface), 71c, 181c...corner portion (curved surface), 81...fitting portion, 81a...end surface (second plane), 81b...side surface , 81c, 171c...corner portion (slope), 81d...receiving surface (second surface), 82...shaft portion, 82b...contact surface (contact portion), D1...first direction, D2...second direction Direction, Pc...Closed position, Po...Open position, G1...First gap, G2...Second gap, G3...Third gap, G4...Fourth gap.

Claims (7)

a casing having a sheet provided with a flow path;
A coil that generates a magnetic field when current is passed through it,
It is housed in the housing at a position spaced apart from the sheet in a first direction, is biased in a second direction opposite to the first direction by the magnetic field, faces the sheet, and is provided with a recess. a plunger having a first surface;
a fitting part that is at least partially accommodated in the recess and supported by the plunger; a shaft part that extends from the fitting part in the second direction; and an end of the shaft part in the second direction. a second surface provided on the fitting portion and extending from the shaft portion in a direction intersecting the first direction; between a closed position where the abutment part is located in between and is housed in the casing and contacts the sheet and closes the flow path; and an open position where the contact part is separated from the sheet and opens the flow path. a valve body movable in the closed position and biased toward the closed position by the plunger biased by the magnetic field;
a biasing member supported by the second surface and biasing the valve body in the first direction with elastic force;
Equipped with
The housing has a first inner surface surrounding the shaft portion in a direction perpendicular to the first direction, and a second inner surface surrounding the plunger in a direction perpendicular to the first direction,
The plunger is provided in the recess, surrounds the fitting part in a direction perpendicular to the first direction, and restricts movement of the fitting part in a direction perpendicular to the first direction. having a third inner surface;
A first gap between the first inner surface and the component located between the first inner surface and the shaft, which is closer to the shaft, and the shaft. larger than a second gap between the second inner surface and the plunger;
solenoid valve. The total of the third gap between the third inner surface and the fitting part and the second gap is smaller than the first gap,
The electromagnetic valve according to claim 1. The casing has a third surface facing the first surface,
When the valve body is located in the closed position, a fourth gap is provided between the second surface and the third surface.
The electromagnetic valve according to claim 1 or claim 2. The recess accommodates the fitting portion so that the valve body can swing around the fitting portion.
A solenoid valve according to any one of claims 1 to 3. The plunger is provided at an end of the recess in the first direction and has a first plane facing in the second direction,
The fitting portion has a second plane located opposite to the second surface and facing the first direction, and a side surface facing the third inner surface,
One of the plunger and the fitting portion extends between the first plane and the third inner surface obliquely with respect to the first plane and the third inner surface, or A sloped surface extending obliquely to the second plane and the side surface between the plane and the side surface, or an inclined plane extending between the first plane and the third inner surface, or the second plane and a curved surface extending between the side surface and the side surface;
The electromagnetic valve according to claim 4. The biasing member includes a coil spring supported by the second surface,
The slope or the curved surface is provided at a position spaced apart from the coil spring in the first direction.
The electromagnetic valve according to claim 5. A solenoid valve according to any one of claims 1 to 6,
A pump that can discharge brake fluid,
Equipped with
The brake fluid discharged by the pump is ejected from the flow path toward the contact portion.
Brake control device.

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