JP2019119270A - Fluid pressure control device - Google Patents

Abstract

To provide a fluid pressure control device that can suppress deterioration in accuracy in detecting a rotation angle of a motor that drives a pump.SOLUTION: The fluid pressure control device comprises: a housing 11 having a pump 13 for pressurizing fluid arranged therein; a motor 12 fixed to the housing 11, and driving the pump 13 using a motor shaft 12a and a pump shaft 13a constituting a rotation shaft; a flow path 11c which is formed inside the housing 11, and through which fluid flows; a magnet 14 as a member to be detected made of a magnetic body fixed to the pump shaft 13a constituting the rotation shaft to be rotatable integrally therewith; and an MR sensor 18 as a detecting member that detects a rotation corner that is a rotation position of the magnet 14. The magnet 14 is arranged in the flow path 11c (a space S) filled with fluid. This allows the magnet 14 to be cooled by the fluid to suppress increase in temperature, so that demagnetization accompanying the increase in temperature of the magnet 14 can be suppressed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fluid pressure control device.

  DESCRIPTION OF RELATED ART Conventionally, the pump apparatus for brake systems disclosed by following patent document 1 is known, for example. This conventional pump device is housed in a motor fixed to the housing, a piston pump operated by rotation of the motor shaft, a detector provided at the tip of the shaft, and a case assembled to the housing And a Hall element. In the above-mentioned conventional pump device, based on the change in the direction of the magnetic flux acting between the detecting element provided on the housing side and rotating integrally with the shaft of the motor and the Hall element provided on the case side and facing the detecting element. Thus, the rotation angle of the motor necessary for the hydraulic pressure control is detected.

International Publication No. 2016/119987

  By the way, in the above-mentioned conventional pump device, the motor generates heat when it is energized to drive the motor. Then, the heat of the motor is also transferred to the detector (a member to be detected) which is a magnetic body through the shaft (rotational axis). As a result, the temperature of the detector (member to be detected), which is a magnetic body, may increase as the motor is driven. As described above, when the temperature of the detector (detected member) rises, a phenomenon (demagnetization) occurs in which the magnetic force generated by the detector (detected member) decreases, and as a result, the motor necessary for hydraulic pressure control The detection accuracy for detecting the rotation angle of

  The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a fluid pressure control device capable of suppressing a decrease in detection accuracy of a rotational angle of a motor driving a pump.

  In order to solve the above problems, the invention of a hydraulic control device according to claim 1 comprises a housing in which a pump for pressurizing fluid is disposed, and a motor fixed to the housing and driving the pump by a rotating shaft. A flow passage formed inside the housing through which the fluid flows, a detection member made of a magnetic body fixed so as to rotate integrally with the rotation shaft, and a detection member detecting the rotational position of the detection member In the fluid pressure control device, the detected member is disposed in the fluid-filled flow path.

  According to this, the to-be-detected member is arrange | positioned in the state immersed in the fluid in the flow path. Thus, in the state where the motor, ie, the pump is driven, the detected member is always cooled by the fluid, and the temperature of the detected member can be suppressed from rising. Therefore, the demagnetization due to the temperature rise of the detection target member is suppressed, and the detection accuracy at the time of detecting the rotation angle of the motor can be maintained high.

It is a perspective view showing composition of a fluid pressure control device concerning an embodiment of the present invention. It is a perspective view which shows the structure of the housing of FIG. It is sectional drawing for demonstrating the structure of the housing of FIG. 1, and a case. It is an example of the block diagram of the brake control system of the vehicle to which a hydraulic device is applied. It is a sectional view showing the composition of the fluid pressure control device concerning the other modification of an embodiment. It is a sectional view showing the composition of the fluid pressure control device concerning the other modification of an embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments and modifications, parts which are the same as or equivalent to each other are given the same reference numerals in the drawings. Moreover, each figure used for description is a concept, and the shape of each part may not necessarily be exact.

  The hydraulic pressure control device 10 includes a housing 11 and a case 16 as shown in FIG. The housing 11 is made of a metal material (for example, aluminum), and as shown in FIGS. 1 and 2, a motor mounting surface 11a as a first surface to which the motor 12 for driving the pump 13 is attached is provided on one side. There is. Further, as shown in FIG. 2, the housing 11 is provided with a case mounting surface 11 b as a second surface on the opposite side to the motor mounting surface 11 a. Further, the housing 11 is formed with a plurality of flow paths 11 c through which a fluid having a hydraulic pressure controlled by the operation of the solenoid valve 15 flows. Furthermore, a plurality of solenoid valves 15 are provided on the case mounting surface 11b, and as shown in FIG. 3, the case 16 in which the coil 15a is integrally assembled is provided on the housing 11 as a coil 15a. To be inserted into the

  Here, in the present embodiment, as shown in FIG. 3, the flow path 11 c is formed to include a space S filled with a fluid, which accommodates a magnet 14 which is a detection target member described later. The fluid filled in the space S may be sucked by the pump 13 to generate a flow, or may not flow regardless of the suction of the pump 13. Further, in the following description, among the flow paths provided in the housing 11, the flow path for flowing the fluid into the housing 11 is the suction flow path 11c1, and the flow path for discharging the fluid pressurized by the pump 13 is the discharge flow path It will be 11c2. As shown in FIG. 3, the suction flow path 11c1 includes a reservoir R1 for storing fluid and a pipe R2 for supplying the fluid stationed in the reservoir R1, and a pump 13 for suctioning the fluid stored in the reservoir R1 and the reservoir R1. Connected to the suction path R connecting the Thus, when the pump 13 sucks fluid and discharges the pressurized fluid to the discharge flow channel 11c2, the suction flow channel 11c1 receives the fluid stored in the reservoir R1 via the piping R2 (shown in FIG. It is supplied to the

  Further, as shown in FIGS. 2 and 3, the housing 11 is provided with a through hole 11 d for housing the motor 12 and the pump 13. In the through hole 11d, the opening on the case attachment surface 11b side of the housing 11 is closed in a fluid-tight manner by the lid member 11e. As shown in FIG. 3, the lid member 11 e is formed of a resin material or a metal material (for example, aluminum). Here, as shown in FIG. 3, the thickness (plate thickness) of the lid member 11 e is set so as to be thinner than the thickness t between the through hole 11 d and the coil 15 a in the housing 11. The case mounting surface 11b of the housing 11 is provided with a support 11f for supporting a control board 17 described later.

  The motor 12 is, for example, a brushless motor, and drives the pump 13 by a motor shaft 12a that constitutes a rotation shaft. The motor 12 pivotally supports the motor shaft 12a, and is provided with a flange portion 12b fixed in a fluid-tight manner by the motor mounting surface 11a of the housing 11 and a bolt (not shown). As shown in FIG. 3, the motor shaft 12 a is inserted into a through hole 11 d provided in the motor mounting surface 11 a of the housing 11.

  The pump 13 pressurizes the fluid, and is arranged to be accommodated in the through hole 11 d of the housing 11. The pump 13 is connected to the motor shaft 12a at its base end by a coupling or the like, and is a pump shaft 13a that rotates integrally with the motor shaft 12a; and a pump impeller that is fixed to the pump shaft 13a and rotates integrally with the pump shaft 13a And 13b. Here, the motor shaft 12a and the pump shaft 13a which are integrally rotatably coupled to each other constitute a "rotational shaft".

  In the present embodiment, the motor shaft 12a and the pump shaft 13a are linearly connected so as to have the same axis. However, for example, it is also possible to connect the motor shaft 12a and the pump shaft 13a by a gear member or the like so that the axis of the pump shaft 13a is offset with respect to the axis of the motor shaft 12a.

  A cylindrical magnet 14 as a detection target made of a magnetic body is fixed to the tip end side of the pump shaft 13a constituting the rotation shaft so as to integrally rotate. The magnet 14 is in communication with the suction flow passage 11c1 and in the flow passage 11c (space S) filled with fluid, more specifically, on the upstream side of the suction port of the pump 13 and in communication with the suction passage R, atmospheric pressure. It is arrange | positioned in the flow path 11c (space S) currently maintained. The magnet 14 is provided with an N pole and an S pole on the side facing the lid member 11 e.

  As shown in FIG. 2, the solenoid valve 15 is provided on the case mounting surface 11b, and includes a coil 15a, a stator (not shown) and a mover (not shown), and the mover is energized by energization of the coil 15a. It is a known electromagnetic valve that opens and closes by moving relative to the stator. In the solenoid valve 15, at least a coil 15a to be energized is integrally fixed to at least the case 16, a valve portion (not shown) is inserted into the inside of the housing 11, and the flow of fluid flowing through the flow passage 11c other than the space S It is designed to adjust the fluid pressure.

  As shown in FIG. 3, the case 16 accommodates the coil 15a to control the operation of the motor 12 and the solenoid valve 15, and a control board 17 as a control unit on which an MR sensor 18 which is a detection member described later is mounted. Is housed. The control board 17 is a printed wiring board, and is fixed to the case mounting surface 11 b which is the outside of the housing 11 together with the case 16 in a state of being accommodated in the case 16. The control board 17 is connected to the coil 15a via the connection wire 17a. Thus, the control board 17 controls the operation of the solenoid valve 15 via the connection wire 17 a wired inside the case 16. The control board 17 is connected to the motor 12 via the connection wire 17 b, and controls the drive of the motor 12 based on the detection result of the MR sensor 18.

  Further, in the control substrate 17 which is a printed wiring board, the magnet 14 (detected member) in a state of being immersed in the fluid in the flow path 11c (space S) formed inside the through hole 11d of the housing 11 An MR sensor 18 as a detection member and an attached circuit 17c, which are disposed to face each other via the lid member 11e, are mounted. Here, the accessory circuit receives and processes a power supply circuit (not shown) for supplying power to the MR sensor 18 and a signal representing a change in the direction of the magnetic flux detected and outputted by the MR sensor 18 as described later. It is configured to include at least one of processing circuits (not shown).

  The MR sensor 18 detects a change in the direction of the magnetic flux as a physical quantity related to the rotation of the magnet 14 generated as the magnet 14 integrally rotates with the pump shaft 13a (that is, the motor shaft 12a). The rotation angle which is the rotation position of the magnet 14, that is, the rotation angle of the motor shaft 12a connected to the pump shaft 13a which rotates integrally is detected. Here, the change in the direction of the magnetic flux generated by the magnet 14 is detected by the MR sensor 18 via the lid member 11 e that closes the through hole 11 d of the housing 11 in a liquid tight manner. By the way, as described above, the lid member 11 e is formed of a resin material or a thin metal material (for example, aluminum). Thereby, the lid member 11 e is less likely to generate an eddy current or the like with respect to the change in the direction of the magnetic flux generated by the magnet 14, and as a result, affects the magnetic force (magnetic flux) reaching the MR sensor 18. Is supposed to be suppressed.

  Furthermore, as shown in FIG. 3, the fluid pressure control device 10 of the present embodiment prevents foreign matter, which flows with the fluid into the inside of the through hole 11 d of the housing 11, that is, the flow passage 11 c (space S), from adhering to the magnet 14. A single foreign matter recovery member 19 made of magnetic material is provided. Specifically, the foreign matter recovery member 19 is disposed between the pump 13 and the magnet 14 and flows into the flow passage 11c (the space S) together with the fluid via the suction flow passage 11c1 or wears from the pump 13 Remove foreign substances (metal powder etc.) that fall off. In the present embodiment, the foreign matter recovery member 19 is an annular foreign matter recovery magnet 19a fixed to the inner peripheral surface of the through hole 11d, and a mesh-like foreign matter recovery filter formed so as to penetrate the pump shaft 13a. And 19b.

  The foreign matter recovery magnet 19a adsorbs and removes foreign matter (for example, iron swarf and the like) of a magnetic body that flows into the flow path 11c (space S) together with the fluid. The foreign matter collecting magnet 19a is provided at a position separated from the magnet 14 along the inner circumferential surface of the through hole 11d, that is, the radial direction of the magnet 14 (pump shaft 13a). Thereby, when the pump 13 sucks in fluid, the foreign matter of the magnetic body that has flowed into the flow passage 11c (space S) together with the fluid flows toward the foreign matter recovery member 19, and as a result, it is not absorbed by the magnet 14 It is preferentially adsorbed and removed by the foreign matter recovery magnet 19a.

  The foreign matter collection filter 19b mainly filters out and removes nonmagnetic foreign matter (for example, aluminum swarf and the like) flowing into the flow path 11c (space S) together with the fluid. When the pump 13 sucks in fluid, the nonmagnetic foreign matter that has flowed into the flow path 11c (space S) with the fluid flows toward the foreign matter recovery member 19, and as a result, it is filtered by the grid-like filter 19b for foreign matter recovery. Being removed.

  In the hydraulic pressure control device 10 configured as described above, when the motor 12 is driven, the pump shaft 13a, the pump impeller 13b, and the magnet 14 integrally rotate. The pump 13 sucks fluid through the suction passage R, the suction flow passage 11c1 and the flow passage 11c (space S), pressurizes the sucked fluid, and discharges it from the discharge flow passage 11c2. In this case, by rotating together with the motor shaft 12a (pump shaft 13a), the magnetic force generated by the magnet 14 immersed in the fluid in the flow path 11c (space S) changes. Then, a change in the direction of the magnetic flux generated by the magnet 14 is detected by the MR sensor 18 integrally connected to the control substrate 17 fixed to the case 16. The change in the direction of the magnetic flux detected by the MR sensor 18 corresponds to the rotation angle of the motor shaft 12 a that rotates integrally with the magnet 14. Therefore, for example, the electronic control unit (microcomputer) provided on the control board 17 detects the rotation angle of the motor 12 based on the detected rotation angle (change in the direction of the magnetic flux) to drive the motor 12 Control.

  As can be understood from the above description, the fluid pressure control device 10 of the above embodiment is fixed to the housing 11 and the housing 11 in which the pump 13 for pressurizing fluid is disposed, and constitutes a rotation shaft. The motor 12 driving the pump 13 by the motor shaft 12a and the pump shaft 13a, the flow path 11c formed inside the housing 11 for fluid flow, and the pump shaft 13a constituting the rotation shaft are fixed so as to integrally rotate. A fluid pressure control device comprising a magnet 14 as a detection target member made of a magnetic body and an MR sensor 18 as a detection member for detecting a rotation angle which is a rotation position of the magnet 14. The magnet 14 is a fluid Are disposed in the flow channel 11c (space S) filled with

  According to this, the magnet 14 is arrange | positioned in the state immersed in the fluid in the flow path 11c (space S). Thereby, in a state where the motor 12 or the pump 13 is driven, the magnet 14 is always cooled by the fluid, and it is possible to suppress the temperature of the magnet 14 from rising. Therefore, the demagnetization caused by the temperature rise of the magnet 14 is suppressed, and the MR sensor 18 can accurately detect the change in the direction of the magnetic flux generated by the rotation of the magnet 14. As a result, the rotation angle of the motor 12 The detection accuracy at the time of detection can be maintained high.

  In this case, the fluid pressure control device 10 is provided with a single foreign matter recovery member 19 made of a magnetic material so as to prevent the foreign matter flowing together with the fluid in the flow path 11c (space S) from adhering to the magnet 14.

  According to this, since the foreign matter recovery member 19 can adsorb and recover at least the foreign matter of the paramagnetic material, the foreign matter can be prevented from adhering to the magnet 14. As a result, it is possible to prevent foreign matter from adhering to the magnet 14 and affecting the change in the direction of the magnetic flux generated by the rotation of the magnet 14, and the magnetic flux generated by the rotation of the magnet 14 by the MR sensor 18. It is possible to detect changes in the direction of the object with high accuracy. Therefore, detection accuracy when detecting the rotation angle of the motor 12 can be maintained high.

  In this case, the foreign matter recovery member 19 (more specifically, the foreign matter recovery magnet 19a and the foreign matter recovery filter 19b) is disposed at least between the pump 13 and the magnet 14. Here, the foreign matter collecting magnet 19 a is disposed at a position separated from the magnet 14 along the radial direction of the magnet 14.

  According to this, when the fluid and foreign matter in the flow path 11c (the space S) are sucked by the pump 13, the foreign matter recovery member 19 can recover the foreign matter in preference to the magnet 14 along with the flow of the fluid. . Further, by arranging the foreign matter collecting magnet 19a at a position spaced apart from the magnet 14 along the radial direction, the foreign matter collecting magnet 19a takes priority over the magnet 14 in accordance with the flow of fluid accompanying suction of the pump 13 Can be adsorbed. Thereby, the foreign matter can be prevented from adhering (adsorbed) to the magnet 14. Therefore, detection accuracy when detecting the rotation angle of the motor 12 can be maintained high.

  Further, the hydraulic pressure control device 10 has an attachment circuit 17 c including at least one of a power supply circuit for supplying power to the MR sensor 18 and a processing circuit for receiving and processing a signal output from the MR sensor 18, A control board 17 is provided as a control unit in which the MR sensor 18 and the attachment circuit 17c are mounted on the same printed wiring board. In this case, the MR sensor 18 is disposed outside the housing 11 so as to face the magnet 14 disposed in the flow passage 11 c (the space S). Here, in this case, the housing 11 is provided with a through hole 11d for housing the pump 13, and the opening on the case attachment surface 11b (second surface) side of the through hole 11d is closed by the lid member 11e.

  According to this, by mounting the MR sensor 18 and the attachment circuit 17 c on the control substrate 17, it is possible to shorten the wiring for connecting the control substrate 17 and the MR sensor 18. Thus, the wiring of the fluid pressure control device 10 can be easily managed, and the miniaturization of the fluid pressure control device 10 can be achieved.

  The control board 17 is fixed to the case mounting surface 11 b which is the outside of the housing 11 together with the case 16 by being accommodated in the case 16, for example. Thereby, the magnet 14 is immersed in the fluid in the flow passage 11c (space S) of the housing 11, and the MR sensor 18 is disposed to face the magnet 14 in a state of being separated from the flow passage 11c (space S). Ru. Therefore, for example, control is performed such that the magnet 14 is protruded from the flow path 11c (the space S) or the MR sensor 18 is arranged inside the flow path 11c (the space S) and arranged outside the flow path 11c (the space S) There is no need to wire with the substrate 17.

  That is, in the fluid pressure control device 10, it is not necessary to provide a through hole for detecting the rotational angle of the motor 12 in the housing 11, and there is no cavity (a place where air can exist) in the housing 11. It is possible to configure. Similarly, it is not necessary to provide a through hole for wiring the MR sensor 18 to the housing 11, and it is possible to configure the housing 11 so as to have no cavity. Thereby, when providing several flow paths 11c in the housing 11, it is not necessary to avoid the through-hole (cavity) and to provide the flow path 11c, and a flow-path design becomes easy.

  Moreover, since it is not necessary to penetrate the flow path 11c (space S) filled with the fluid, it is not necessary to separately provide a seal structure. As a result, the number of components constituting the hydraulic pressure control device 10 can be reduced, and since it is not necessary to separately provide an assembling operation, it is possible to improve the assemblability. Furthermore, in order to arrange the MR sensor 18 inside the flow path 11c (space S), it is not necessary to apply a coating or the like that protects the MR sensor 18 from the fluid. Therefore, the manufacturing cost of the hydraulic pressure control device 10 can be reduced, and the hydraulic pressure control device 10 can be miniaturized.

(Modification)
In the above embodiment, the foreign matter recovery member 19 is provided in the through hole 11 d of the housing 11, that is, in the flow path 11 c (space S). Instead of this, as shown by a broken line in FIG. 3, a foreign matter recovery member 19 is provided in the suction path R on the upstream side of the magnet 14 which is the detection member in the fluid flow direction when the pump 13 sucks the fluid. It is also possible to provide at least In this case, in the foreign matter recovery member 19, the foreign matter recovery magnet 19a can be provided outward of the pipe wall of the pipe R2, and the foreign matter recovery filter 19b can be provided inward of the pipe wall of the pipe R2. .

  As described above, even in the case of the modification in which the foreign matter recovery member 19 is provided in the suction passage R, the foreign matter recovery member 19 can recover the foreign matter flowing with the fluid as in the above embodiment. The effect of When the foreign matter collecting magnet 19a is provided in the suction path R, it can be provided outside the pipe wall of the pipe R2. Thus, for example, there is no need to partially increase the diameter of the pipe R2 in order to dispose the foreign substance collecting magnet 19a inward of the pipe wall of the pipe R2, and the foreign substance collecting magnet 19a can be extremely easily. It can be assembled.

  By the way, the fluid pressure control device 10 described in the above embodiment and the above modification can be applied to, for example, a brake control system of a vehicle. Hereinafter, an example of a brake control system to which the fluid pressure control device 10 can be applied will be briefly described with reference to FIG.

  In the brake control system, the hydraulic pressure control device 10 is incorporated into the actuator 5. As shown in FIG. 4, the brake control system includes, as the cylinder mechanism 23, a master cylinder (M / C) 230, master pistons 231 and 232, and a master reservoir 233 (corresponding to the reservoir R1). The wheel cylinders 24, 25, 26, 27 are respectively disposed on the left rear wheel RL, the right rear wheel RR, the left front wheel FL, and the right front wheel FR to apply a braking force. Master cylinder 230 and wheel cylinders 24 to 27 are connected via actuator 5.

  The actuator 5 (the fluid pressure control device 10) controls the fluid pressure of the wheel cylinders 24 to 27 (hereinafter referred to as "wheel pressure") in accordance with an instruction from the brake control device 6. Specifically, the actuator 5 is provided with a hydraulic circuit 50 as shown in FIG. The hydraulic circuit 50 includes a first piping system 50a and a second piping system 50b. The first piping system 50a is a system that controls the wheel pressure applied to the left rear wheel RL and the right rear wheel RR. The second piping system 50b is a system that controls the wheel pressure applied to the left front wheel FL and the right front wheel FR.

  The first piping system 50a is equivalent to the main conduit A (corresponding to the suction flow passage 11c1 and the discharge flow passage 11c2), the differential pressure control valve 51 (corresponding to the solenoid valve 15), and the pressure increasing valves 52 and 53 (the solenoid valve 15). ), The pressure reducing pipe line B, the pressure reducing valves 54 and 55 (corresponding to the solenoid valve 15), the pressure control reservoir 56, the return line pipe C, and the auxiliary pipe line D. The differential pressure control valve 51 is capable of controlling the differential pressure between the fluid pressure on the side of the master cylinder 230 (master cylinder side) and the fluid pressure on the side of the wheel cylinders 24 and 25 (wheel cylinder side). The brake control device 6 (corresponding to the control board 17) is provided to control these respective solenoid valves.

  The reflux line C is a line connecting the pressure reducing line B (or the pressure adjusting reservoir 56) and the portion of the main line A between the differential pressure control valve 51 and the pressure increasing valves 52 and 53. The pump 57 (corresponding to the pump 13) is a pump driven by the motor 8 (corresponding to the motor 12) and is provided in the reflux line C, and from the pressure regulation reservoir 56 to the master via the reflux line C. The fluid is allowed to flow to the cylinder side or the wheel cylinder side. A damper 7 is disposed in the discharge side passage C1 of the reflux pipe line C (corresponding to the discharge flow path 11c2) which is the discharge side of the pump 57 in the reflux pipe line C.

  When the above-described hydraulic control device 10 is applied to the actuator 5 of the brake control system of a vehicle, the magnet 14 is immersed in the flowing fluid (fluid), and the motor 8 (motor 12) is driven. Even then, the magnet 14 is cooled by the fluid. Thereby, it can suppress that the temperature of the magnet 14 rises. Therefore, the demagnetization due to the temperature rise of the magnet 14 is suppressed, and the MR sensor 18 can detect the change of the direction of the magnetic flux generated by the rotation of the magnet 14 with high accuracy. As a result, the motor 8 (motor 12) The detection accuracy at the time of detecting the rotation angle of can be maintained high.

  Also, in a vehicle brake control system, fluid circulates in the system. When the fluid pressure control device 10 described above is applied to the actuator 5 of the brake control system of the vehicle, the foreign matter recovery member 19 can adsorb or filter out the foreign matter of the paramagnetic body and the nonmagnetic body and recover it. It can suppress that a foreign material adheres to the magnet 14 which is a to-be-detected member. Thereby, it is possible to suppress the influence of the attached foreign matter on the change in the direction of the magnetic flux generated by the rotation of the magnet 14, and the MR sensor 18 changes the direction of the magnetic flux generated by the rotation of the magnet 14. It can detect accurately. Therefore, the detection accuracy when detecting the rotation angle of the motor 8 (motor 12) can be maintained high, and the brake control device 6 uses the rotation angle of the motor 8 (motor 12) detected with high accuracy. The braking control in the brake control system can be performed more accurately.

  The embodiment of the present invention is not limited to the above embodiment and modifications, and various modifications can be made without departing from the object of the present invention.

  For example, in the above-mentioned embodiment and the above-mentioned modification, magnet 14 which is a member to be detected is directly exposed to fluid in channel 11c (space S). Instead of this, as shown in FIG. 5, it is also possible to provide a protective layer 14 a by resin coating or plating on the outer surface of the magnet 14. When the protective layer 14 a is provided as described above, for example, corrosion of the magnet 14 due to fluid can be prevented, and adhesion of foreign matter can be effectively suppressed.

  Further, in the embodiment and the modification, the detection target member is the magnet 14, and the detection member is the MR sensor 18. Instead of this, as shown in FIG. 6, for example, a projection 14 ′ radially extended on the tip end side of the pump shaft 13a which is a magnetic body is provided as a detection target member, and this projection 14 ′ is rotated. It is also possible to provide the Hall element 18 'as a detection member so as to detect a change in magnetic force. Also in this case, the protrusions 14 'are disposed to be immersed in the fluid in the flow channel 11c (space S), and are always cooled by the fluid. Thus, even in this case, the temperature rise of the protrusion 14 'due to the drive of the motor 12 is suppressed and it becomes difficult to cause demagnetization. As a result, the Hall element 18' can detect the change of the magnetic force with high accuracy. . Therefore, also in this case, the same effect as that of the above embodiment can be obtained.

  In the embodiment and the modification, the foreign matter collection filter 19b constituting the foreign matter collection member 19 mainly collects and collects foreign matter of nonmagnetic material. Instead of this, the foreign matter collection filter 19b is magnetized, and the magnetized foreign matter collection filter 19b adsorbs and collects foreign matter of the magnetic body, and at the same time, foreign matter of the nonmagnetic body is filtered to collect foreign matter of the nonmagnetic body. It is also possible to do so. In this case, for example, the size of the foreign matter recovery magnet 19 a can be reduced, which can contribute to the downsizing of the fluid pressure control device 10.

  In the embodiment and the modification, the single foreign matter recovery member 19 is provided in the through hole 11d, that is, the flow passage 11c (space S) or the suction passage R. Instead of this, the foreign matter recovery member 19 is provided in the through hole 11d, that is, the flow passage 11c (space S) as in the above embodiment, and the foreign matter recovery member 19 is also provided in the suction path R as in the above modification It is also possible that the fluid pressure control device 10 includes a plurality of foreign matter recovery members 19. Furthermore, it is also possible to provide the foreign material recovery member 19 in each of the pipes constituting the brake control system described above. According to this, for example, in the brake control system, even if foreign matter present in the inside of the pipe is included in the fluid by circulating fluid (fluid), for example, the plurality of foreign matter recovery members 19 are fluid Foreign substances contained in the waste can be more reliably recovered (removed). Thereby, in particular, foreign substances of the magnetic body can be more reliably suppressed (adhered) from adhering to the magnet 14, and as a result, the accuracy of detecting the change in the direction of the magnetic flux by the MR sensor 18 can be maintained. Can. Therefore, it is possible to suppress the detection accuracy of the rotation angle of the motor 12 from being lowered.

  Further, in the embodiment and the modification, the foreign matter recovery member 19 is configured to include the foreign matter recovery magnet 19a and the foreign matter recovery filter 19b. Instead of this, it is also possible to configure the foreign matter recovery member 19 from one of the foreign matter recovery magnet 19a and the foreign matter recovery filter 19b. Even in the case where the foreign matter recovery member 19 includes the foreign matter recovery magnet 19a or the foreign matter recovery filter 19b, the foreign matter which has flowed into the flow path 11c (space S) can be recovered without adhering to the magnet 14. It becomes.

DESCRIPTION OF SYMBOLS 10 ... Fluid pressure control apparatus, 11 ... Housing, 11a ... Motor attachment surface, 11b ... Case attachment surface, 11c ... Flow path, 11c1 ... Suction flow path, 11c 2 ... Discharge flow path, 11d ... Through hole, 11e ... Lid member, 11f ... post 12, 12 ... motor 12a ... motor shaft (rotational shaft), 12b ... flange portion, 13 ... pump 13a ... pump shaft (rotational shaft), 13b ... pump impeller, 14 ... magnet (detected member), 14 'Protuberance (detected member) 14a Protective layer 15 Solenoid valve 15a Coil 16 Case 17 Control board 17a, 17b Connecting electric wire 17c Attached circuit 18 MR sensor (detection member), 18 'Hall element (detection member) 19, foreign material collection member 19a foreign material collection magnet 19b foreign material collection filter R suction path R1 reservoir , R2 ... piping, S ... space

Claims (6)

A housing in which a pump for pressurizing fluid is disposed;
A motor fixed to the housing and driving the pump by a rotating shaft;
A flow passage formed in the interior of the housing and through which the fluid flows;
A detection member made of a magnetic body fixed so as to rotate integrally with the rotation shaft;
And a detection member for detecting a rotational position of the detection target member.
The detected member is
A fluid pressure control device disposed in the flow path filled with the fluid.   2. The fluid pressure control device according to claim 1, further comprising a single or a plurality of foreign matter recovery members made of a magnetic body so as to prevent foreign matter flowing together with the fluid in the flow path from adhering to the detected member. The foreign matter recovery member at least
The fluid pressure control device according to claim 2, wherein the fluid pressure control device is provided in a suction path that connects a reservoir for storing the fluid and the pump for sucking the stored fluid. The foreign matter recovery member at least
The fluid pressure control device according to claim 2 or 3 arranged between said pump and said detected member. It has an attachment circuit including at least one of a power supply circuit that supplies power to the detection member and a processing circuit that receives and processes a signal output from the detection member,
The fluid pressure control according to any one of claims 1 to 4, further comprising: a control unit mounted on the same printed wiring board to control the driving of the motor. apparatus. The detection member is
The fluid pressure control device according to any one of claims 1 to 5, wherein the fluid pressure control device is disposed outside the housing so as to face the detection target member disposed in the flow path.

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