Hydraulic pressure supply device

Abstract

The invention discloses a hydraulic supply device. The hydraulic pressure supply device includes: a motor including a stator and a rotor; a motion conversion mechanism for converting the rotational motion of the rotor into linear motion; a piston which is connected to the motion conversion mechanism and performs linear motion; a housing including a cylinder in which the piston is disposed so as to be linearly movable, and a guide which extends in the longitudinal direction of the cylinder and is inserted inside the piston, and in which a fluid pressurized by the piston is disposed in a space between the inner peripheral surface of the cylinder and the outer peripheral surface of the guide; a first magnet disposed in the piston; and a first magnetic sensor that is disposed on the guide and detects a change in the magnetic field of the first magnet due to the rectilinear motion of the piston.

Description

Technical Field

[0001] The present invention relates to a hydraulic pressure supply device, and more particularly, to a device for supplying hydraulic pressure for braking in a brake system of a vehicle. Background Art

[0002] Brakes are devices for reducing the speed of a vehicle or maintaining a stopped state of the vehicle. Recently, the use of electronic brake systems for electrically controlling the driving of brakes has been increasing.

[0003] In an electronic brake system, hydraulic pressure for braking can be supplied by a pump including a motor. In order to control such an electronic brake system, it is necessary to accurately measure the position of a piston that performs linear motion inside the pump as the motor rotates.

[0004] Conventionally, a method of indirectly measuring the position of the piston by a mechanism synchronized with the rotating body of the motor is generally used. However, this indirect measurement method has a high probability of losing the piston position information due to sensor failure, S / W execution error, etc.

[0005] On the other hand, conventionally, a sensor for measuring the position of the piston is disposed on an electronic control unit (ECU) provided outside the pump, which increases the difficulty of assembling the ECU and the accurate placement of the sensor. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] The present invention is intended to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a hydraulic supply device that can accurately measure the position of a piston that pressurizes a fluid in a cylinder in a direct manner.

[0008] Another object of the present invention is to provide a hydraulic pressure supply device that can be provided with a sensor for measuring the position of a piston for pressurizing a fluid in a cylinder, thereby facilitating assembly of an electronic control unit.

[0009] Problems of the present invention are not limited to the problems mentioned above, and those skilled in the art to which the present invention belongs can clearly understand other problems not mentioned through the following description.

[0010] (II) Technical solution

[0011] According to one embodiment of the present invention, a hydraulic supply device is provided, comprising: a motor, comprising a stator and a rotor; a motion conversion mechanism, which converts the rotational motion of the rotor into linear motion; a piston, which is connected to the motion conversion mechanism to perform linear motion; a housing, comprising a cylinder and a guide, the piston being arranged in the cylinder so as to be linearly movable, the guide extending along the length direction of the cylinder and inserted into the inner side of the piston, and the fluid pressurized by the piston being arranged in the space between the inner circumferential surface of the cylinder and the outer circumferential surface of the guide; a first magnet, which is arranged on the piston; and a first magnetic sensor, which is arranged on the guide to detect the change in the magnetic field of the first magnet based on the linear motion of the piston.

[0012] In the hydraulic supply device according to one embodiment of the present invention, the first magnet may be in a ring shape.

[0013] In the hydraulic supply device according to one embodiment of the present invention, the first magnet may be disposed inside the piston.

[0014] In the hydraulic supply device according to an embodiment of the present invention, the piston may include a hollow piston body and a placement portion, wherein the placement portion is sunken radially outward on the inner circumferential surface of the piston body, and the first magnet is disposed on the placement portion.

[0015] In the hydraulic pressure supply device according to one embodiment of the present invention, one side of the first magnet may be supported by the step portion of the placement portion.

[0016] The hydraulic supply device of one embodiment of the present invention may further include a guide bushing, which is arranged between the inner circumferential surface of the piston body and the outer circumferential surface of the guide member to guide the linear motion of the piston and is arranged to support the other side of the first magnet.

[0017] In the hydraulic supply device according to one embodiment of the present invention, the first magnet may be disposed on an outer surface of the piston.

[0018] The hydraulic supply device according to one embodiment of the present invention may further include a connector assembly, wherein the connector assembly is disposed inside the guide member.

[0019] In the hydraulic supply device according to one embodiment of the present invention, the first magnetic sensor may be connected to the connector assembly.

[0020] The hydraulic pressure supply device according to one embodiment of the present invention may further include a second magnet connected to the rotor, disposed on a rotating shaft of the rotor, and rotating together with the rotor.

[0021] The hydraulic pressure supply device according to one embodiment of the present invention may further include a second magnetic sensor disposed on the guide member to detect a change in a magnetic field due to rotation of the second magnet.

[0022] According to another embodiment of the present invention, a hydraulic supply device is provided, comprising: a motor, comprising a stator and a rotor; a motion conversion mechanism, which converts the rotational motion of the rotor into linear motion; a piston, which is connected to the motion conversion mechanism to perform linear motion; a housing, comprising a cylinder and a guide, wherein the piston is arranged in the cylinder so as to be linearly movable, the guide extends along the length direction of the cylinder and is inserted into the interior of the piston, and the fluid pressurized by the piston is arranged in the space between the inner circumferential surface of the cylinder and the outer circumferential surface of the guide; a first magnet is arranged on the piston; a second magnet is connected to the rotor, arranged on the rotating shaft of the rotor, and rotates with the rotor; and a magnetic sensor is arranged on the guide to detect the magnetic field change of the first magnet based on the linear motion of the piston or the magnetic field change of the second magnet based on the rotation of the rotor.

[0023] In the hydraulic supply device according to one embodiment of the present invention, the first magnet may be in a ring shape.

[0024] In the hydraulic supply device according to an embodiment of the present invention, the piston may include a hollow piston body, and the first magnet may be disposed on an inner peripheral surface of the piston body, an outer peripheral surface of the piston body, or inside the piston body.

[0025] The hydraulic supply device according to one embodiment of the present invention may further include a connector assembly, wherein the connector assembly is disposed inside the guide member, and the magnetic sensor may be connected to the connector assembly.

[0026] (III) Beneficial effects

[0027] The hydraulic supply device of the present invention can detect the change in magnetic field by using a magnet that moves linearly together with a piston that pressurizes a fluid in a cylinder, thereby directly and accurately measuring the position of the piston.

[0028] Furthermore, the hydraulic supply device of the present invention can effectively configure the sensor at an accurate position by configuring a sensor for measuring the position of a piston that pressurizes the fluid in the cylinder inside the cylinder, and can easily realize the assembly of the electronic control unit.

[0029] It should be understood that the effects of the present invention are not limited to the above-mentioned effects, but include all effects that can be inferred from the specific embodiments of the present invention or the structure of the invention described in the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a cross-sectional view of a hydraulic supply device according to an embodiment of the present invention.

[0031] Figure 2 For Figure 1 A magnified portion of the image.

[0032] Figure 3 This is a perspective view showing a cylinder head of a housing of a hydraulic supply device according to an embodiment of the present invention from the front side.

[0033] Figure 4 The present invention is a perspective view showing a cylinder head of a housing of a hydraulic supply device according to an embodiment of the present invention from the rear side.

[0034] Figure 5 It is a diagram showing a modified example of the hydraulic pressure supply device according to one embodiment of the present invention.

[0035] Figure 6 It is a diagram showing another modified example of the hydraulic pressure supply device according to one embodiment of the present invention.

[0036] Figure 7 It is a diagram showing still another modified example of the hydraulic pressure supply device according to the embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 1: Hydraulic supply device

[0039] 100: Motor 200: Motion conversion mechanism

[0040] 300: Piston 400: Housing

[0041] 500: first magnet 550: second magnet

[0042] 600: first magnetic sensor 650: second magnetic sensor

[0043] 700: Connector assembly 800: Electronic control unit DETAILED DESCRIPTION

[0044] The embodiments of the present invention are described in detail below with reference to the accompanying drawings so that a person skilled in the art can easily implement the present invention. However, the present invention can be embodied in a variety of different forms, and the present invention is not limited to the embodiments described herein. In order to clearly describe the present invention, parts not related to the description of the drawings are omitted, and the same or similar structural elements are given the same reference numerals throughout the specification.

[0045] The words or terms used in this specification and claims should not be interpreted limited to the conventional or dictionary meanings, but should be interpreted based on the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way, and in a meaning and concept that is consistent with the technical idea of ​​the present invention.

[0046] It should be understood that, in this specification, terms such as "including" or "having" are intended to specify the features, numbers, steps, actions, structural elements, parts or their combinations recorded in the specification, rather than excluding the existence or additional possibility of one or more other features or numbers, steps, actions, structural elements, parts or their combinations in advance.

[0047] Figure 1 is a cross-sectional view of a hydraulic supply device according to an embodiment of the present invention. Figure 2 For Figure 1 A magnified portion of the image.

[0048] The hydraulic pressure supply device 1 according to an embodiment of the present invention may be configured in a brake system of a vehicle to provide hydraulic pressure for braking. More specifically, the hydraulic pressure supply device 1 according to an embodiment of the present invention may be used in an electric brake system that electrically controls the driving of the brake.

[0049] Reference Figure 1 and Figure 2 A hydraulic supply device 1 according to an embodiment of the present invention may include a motor 100 , a motion conversion mechanism 200 , a piston 300 , a housing 400 , a first magnet 500 , a second magnet 550 , a first magnetic sensor 600 , a second magnetic sensor 650 , a connector assembly 700 and an electronic control unit (ECU) 800 .

[0050] The motor 100 receives power to perform rotational motion. The motor 100 generates power for supplying hydraulic pressure. In one embodiment of the present invention, the motor 100 includes a stator 120 and a rotor 130 disposed in a motor housing 110. In this case, the motor 100 may be a hollow type motor.

[0051] A coil (not shown) is wound around the stator 120. The rotor 130 may have magnetic bodies arranged at predetermined intervals on the outer peripheral surface. When power is applied to the stator 120, repulsive force and attractive force are generated between the magnetic body arranged in the rotor 130 and the coil, and the rotor 130 may rotate.

[0052] The motion conversion mechanism 200 converts the rotational motion of the rotor 130 into a linear motion. In one embodiment of the present invention, the motion conversion mechanism 200 may include a screw 210 and a nut 220 .

[0053] The screw 210 is coupled to the rotor 130 and rotates together with the rotor 130. The screw 210 may have a predetermined length and may be configured to rotate together with the rotor 130 on the rotating shaft of the motor 100. In connection with the rotation of the rotor 130 and the screw 210, a first bearing B1 for supporting the rotation of the rotor 130 and a second bearing B2 for supporting the rotation of the screw 210 may be configured on the motor housing 110.

[0054] The nut 220 is coupled to the outer circumference of the screw 210 to convert the rotational motion of the screw 210 into a linear motion. In other words, the nut 220 can perform a linear motion as the screw 210 rotates.

[0055] In one embodiment of the present invention, the nut 220 can be combined with the screw 210 by a ball screw method to convert the rotational motion into a linear reciprocating motion. A plurality of balls (not shown) for reducing friction can be arranged between the nut 220 and the screw 210. That is, the motion conversion mechanism 200 can be configured as a ball screw type.

[0056] The piston 300 is connected to the motion conversion mechanism 200 and performs linear motion. In one embodiment of the present invention, the piston 300 can be connected to the nut 220. In more detail, the piston 300 can be connected to the nut 220 of the motion conversion mechanism 200 to perform linear motion together with the nut 220.

[0057] When the piston 300 moves linearly in one direction, the fluid can be pressurized and hydraulic pressure can be supplied. Also, when the piston 300 moves linearly in the other direction, the pressurization force on the fluid can be reduced and the hydraulic pressure can be released.

[0058] The piston 300 is formed in a hollow shape. More specifically, the piston 300 may include a cylinder-shaped piston body 310. A guide 432 of the housing 400 described later, a first magnet 500, and the like may be disposed inside the piston body 310.

[0059] In one embodiment of the present invention, the piston 300 may have a placement portion 320 sunken toward the outside in the radial direction on the inner circumference. More specifically, the placement portion 320 may be sunken toward the outside in the radial direction on the inner circumference of the piston body 310 .

[0060] The housing 400 is used to contain the fluid pressurized by the piston 300. In addition, the housing 400 may have one or more flow paths 411, and the one or more flow paths 411 are used to supply the hydraulic pressure generated by the linear motion of the piston 300. The housing 400 is arranged on one side of the motor 100. The housing 400 can be connected to the motor 100. Specifically, the housing 400 can be fastened to the motor housing 110.

[0061] In one embodiment of the present invention, the housing 400 may include a housing block 410 , a cylinder 420 , and a guide member 432 .

[0062] The housing block 410 may have one or more flow paths 411, and the fluid pressurized by the piston 300 may flow through the one or more flow paths 411. The housing block 410 may be fastened to the motor housing 110. In addition, the housing block 410 may be provided with a cylinder 420 and a guide member 432.

[0063] The piston 300 can be arranged inside the cylinder 420 so as to move linearly. In one embodiment of the present invention, the cylinder 420 can have a configuration in which one end and the other end in the length direction are both open. Figure 1 In the embodiment, when the right side is defined as the front and the left side is defined as the rear, the cylinder 420 is connected to the housing block 410 in a state where the front and the rear are opened. The piston 300 can enter the inner side of the cylinder 420 through the rear of the cylinder 420.

[0064] The guide member 432 extends along the length direction of the cylinder 420 and is inserted into the inner side of the piston 300. In more detail, the guide member 432 may be inserted into the inner side of the piston body 310 through the front of the piston body 310.

[0065] The fluid pressurized by the piston 300 may be disposed in the space between the inner circumference of the cylinder 420 and the outer circumference of the guide 432. On the other hand, the fluid disposed in the space between the inner circumference of the cylinder 420 and the outer circumference of the guide 432 may be supplied to the flow path 411 of the housing block 410 connected to the cylinder 420.

[0066] The guide member 432 supports the piston 300 so that the linear motion of the piston 300 can be stably realized. The guide member 432 provides a supporting force so that the piston 300 can stably move along the linear motion path inside the piston body 310 .

[0067] In one embodiment of the present invention, the guide member 432 may be in a tube shape, so that the first magnetic sensor 600 , the second magnetic sensor 650 , etc. may be disposed on the guide member 432 .

[0068] The cylinder head 430 covers the open front of the cylinder 420 and is combined with the housing block 410. In one embodiment of the present invention, the guide member 432 may be provided integrally with the cylinder head 430. In other words, the cylinder head 430 may cover the open front of the cylinder 420 and the guide member 432 may be provided inside the cylinder 420.

[0069] Figure 3 This is a perspective view showing a cylinder head of a housing of a hydraulic supply device according to an embodiment of the present invention from the front side. Figure 4 The present invention is a perspective view showing a cylinder head of a housing of a hydraulic supply device according to an embodiment of the present invention from the rear side.

[0070] Reference Figure 3 and Figure 4 The cylinder head 430 includes: a cup-shaped cylinder head body 431 for closing the open front of the cylinder 420; and a tube-shaped guide member 432 extending along the length direction inside the cylinder head body 431 and penetrating the bottom surface of the cylinder head body 431. With this structure, the cylinder head 430 can close the cylinder 420 and set the guide member 432 to the inside of the cylinder 420.

[0071] It is necessary to prevent leakage of the fluid disposed inside the cylinder 420. To this end, one or more sealing members may be disposed in the hydraulic supply device 1 according to an embodiment of the present invention.

[0072] like Figure 1 As shown, in order to prevent the fluid from flowing into the interior of the piston 300 through the inner circumferential surface of the piston 300 and the outer circumferential surface of the guide member 432, a first sealing member S1 may be arranged between the inner circumferential surface of the piston 300 and the outer circumferential surface of the guide member 432. In addition, in order to prevent the fluid from flowing out of the cylinder 420 through the outer circumferential surface of the piston 300 and the inner circumferential surface of the cylinder 420, a second sealing member S2 may be arranged between the outer circumferential surface of the piston 300 and the inner circumferential surface of the cylinder 420. In addition, a third sealing member S3 may be arranged between the housing block 410 and the cylinder head 430. In addition, a fourth sealing member S4 may be arranged between the housing block 410 and the cylinder 420.

[0073] For example, the first sealing member S1 , the second sealing member S2 , the third sealing member S3 , and the fourth sealing member S4 may be O-rings.

[0074] The first magnet 500 is disposed inside the piston 300 and performs linear motion together with the piston 300. The current position of the piston 300 can be measured by the change in magnetic field based on the displacement of the first magnet 500. In one embodiment of the present invention, the change in magnetic field based on the displacement of the first magnet 500 can be detected by the first magnetic sensor 600.

[0075] According to the present invention, the first magnet 500 can be configured to perform linear motion together with the piston 300, and the current position of the piston 300 can be calculated based on the change in the magnetic field of the first magnet 500. Thus, the risk of error in the conventional method of indirectly measuring the position of the piston by a mechanism synchronized with the rotating body of the motor can be avoided.

[0076] The first magnet 500 may be in a ring shape. In addition to the ring shape, the first magnet 500 may also be in various shapes. For example, the first magnet 500 may be in a rod shape. In this case, a plurality of first magnets 500 may be arranged along the circumferential direction of the piston 300 at a predetermined interval.

[0077] The first magnet 500 may be disposed on the inner circumferential surface of the piston 300. Figure 2 The piston 300 may have a placement portion 320 that is recessed toward the outside in the radial direction on the inner circumferential surface. At this time, the first magnet 500 may be disposed on the placement portion 320 .

[0078] The placement portion 320 may be recessed into the inner circumferential surface of the piston body 310 toward the outer side in the radial direction, and the first magnet 500 may be in a ring shape having an outer diameter corresponding to the inner diameter of the placement portion 320 .

[0079] On the other hand, one side of the length direction of the first magnet 500 may be supported by the step portion 320a of the placement portion 320. Figure 2 In the embodiment, when the right side is defined as the front and the left side is defined as the rear, the placement portion 320 may be formed to have a step portion 320a at the rear. Furthermore, no step portion protruding inward in the radial direction is provided in front of the placement portion 320. Thus, the rear of the first magnet 500 may be supported by the step portion 320a of the placement portion 320. This structure not only makes it easy to insert the first magnet 500 into the inner side of the piston 300, but also stably supports the first magnet 500.

[0080] In this regard, the hydraulic supply device 1 according to an embodiment of the present invention may further include a guide bushing 230. The guide bushing 230 is disposed between the inner circumference of the piston 300 and the outer circumference of the guide member 432 to guide the linear motion of the piston 300. In addition, the guide bushing 230 is configured to support the other side (with the first magnet 500) of the longitudinal direction. Figure 2 The direction is determined by the front of the first magnet 500).

[0081] Reference Figure 2 The piston 300 may include an expanded diameter portion 330, which is located in the inner circumferential surface of the piston body 310 and is adjacent to the front of the placement portion 320 and further sunk to the outside in the radial direction. A step portion 330a of the expanded diameter portion 330 is formed between the expanded diameter portion 330 and the placement portion 320.

[0082] The guide bushing 230 may include: a cylindrical guide bushing body 231 having an outer diameter corresponding to the inner diameter of the placement portion 320; and a flange 232 expanding radially outward at one end in the length direction of the guide bushing body 231. The outer diameter of the flange 232 may correspond to the inner diameter of the expanded diameter portion 330.

[0083] In a state where the first magnet 500 is inserted into the piston 300 and the rear of the first magnet 500 is supported by the step portion 320a of the placement portion 320, the guide bushing 230 can be inserted into the piston 300. The guide bushing body 231 of the guide bushing 230 is disposed on the placement portion 320 and supports the front of the first magnet 500, and the flange 232 of the guide bushing 230 is stuck on the step portion 330a of the enlarged diameter portion 330.

[0084] In one embodiment of the present invention, the guide bushing 230 may have an inner diameter corresponding to the outer diameter of the guide member 432, and may be disposed inside the piston 300 to increase the stability of the linear motion of the piston 300 while supporting the front side of the first magnet 500. Thus, the configuration stability of the first magnet 500 may be further increased.

[0085] The second magnet 550 is disposed on the rotating shaft of the rotor 130, and rotates together with the rotor 130. For example, the second magnet 550 may be in a disk shape.

[0086] The rotation position of the motor 100 can be determined by the change in magnetic field due to the rotation of the second magnet 550. In one embodiment of the present invention, the change in magnetic field due to the rotation of the second magnet 550 can be detected by the second magnetic sensor 650.

[0087] As described above, in one embodiment of the present invention, the motion conversion mechanism 200 includes the screw 210, which is coupled to the rotor 130 and rotates together with the rotor 130. The second magnet 550 may be coupled to the screw 210. In more detail, the second magnet 550 may be coupled to the screw 210 at the rotation axis of the screw 210.

[0088] In one embodiment of the present invention, a magnet holder 211 for arranging the second magnet 550 may be combined at one end (front) in the length direction of the screw 210. The magnet holder 211 may be formed of a rod to which the second magnet 550 can be fixed at one end.

[0089] The first magnetic sensor 600 is disposed inside the guide 432 and detects a change in the magnetic field of the first magnet 500 based on the linear motion of the piston 300. For example, the first magnetic sensor 600 may be disposed on the inner circumferential surface of the guide 432.

[0090] The current position of the piston 300 can be grasped by the magnetic field change based on the displacement of the first magnet 500 measured by the first magnetic sensor 600. According to the present invention, the first magnetic sensor 600 can detect the magnetic field change caused by the first magnet 500 that moves linearly together with the piston 300, thereby directly measuring the displacement of the piston 300. Therefore, as described above, the problems of the conventional method of indirectly measuring the position of the piston can be solved by a mechanism synchronized with the rotating body of the motor.

[0091] The second magnetic sensor 650 is disposed inside the guide 432 and detects a change in the magnetic field of the second magnet 550 based on the rotation of the rotor 130. The second magnetic sensor 650 may be disposed on the rotation axis of the rotor 130. In other words, the second magnetic sensor 650 may be disposed on the rotation axis of the screw 210.

[0092] The rotational position of the motor 100 can be determined by the change in magnetic field based on the rotation of the second magnet 550 measured by the second magnetic sensor 650. In the past, a method of estimating the current position of the piston 300 by the change in magnetic field measured by the second magnetic sensor 650 was used. However, as described above, according to the present invention, the position of the piston 300 can be determined based on the change in magnetic field of the first magnet 500 that performs linear motion together with the piston 300. Therefore, even if an error occurs in the second magnetic sensor 650, there is no problem in grasping the position of the piston 300.

[0093] On the other hand, according to the present invention, the first magnetic sensor 600 and the second magnetic sensor 650 are arranged inside the guide 432 of the housing 400. Therefore, compared with the case where the sensors are arranged outside the housing 400, the arrangement and arrangement of the sensors are easier.

[0094] In the past, usually, the magnetic sensor is combined with the printed circuit board of the electronic air unit arranged outside the housing of the hydraulic supply device. In this case, it is not easy to arrange the magnetic sensor at an accurate position, and it increases the difficulty of arrangement and assembly. However, the present invention can arrange the first magnetic sensor 600 and the second magnetic sensor 650 inside the housing 400, so that the arrangement and assembly of the sensors become easy and can be effectively implemented.

[0095] The connector assembly 700 is disposed inside the guide member 432. The connector assembly 700 can transmit the measurement information of the first magnetic sensor 600 and the measurement information of the second magnetic sensor 650 to the electronic control unit 800.

[0096] In one embodiment of the present invention, the first magnetic sensor 600 and the second magnetic sensor 650 may be connected to the connector assembly 700 . That is, the first magnetic sensor 600 and the second magnetic sensor 650 may be connected to the connector assembly 700 and disposed inside the guide member 432 .

[0097] The connector assembly 700 facilitates the arrangement of the first magnetic sensor 600 and the second magnetic sensor 650. Furthermore, a part of the structure of the printed circuit board of the electronic control unit conventionally arranged outside the housing of the hydraulic supply device can be arranged inside the housing 400.

[0098] The electronic control unit 800 is connected to the connector assembly 700 and is disposed on one side of the housing 400. The electronic control unit 800 receives the measurement information of the first magnetic sensor 600 and the measurement information of the second magnetic sensor 650. In addition, the electronic control unit 800 can control the rotation of the motor 100.

[0099] As described above, according to the present invention, the first magnetic sensor 600 and the second magnetic sensor 650 are not arranged in the electronic control unit 800. In addition, a part of the structure of the printed circuit board that is conventionally arranged outside the housing of the hydraulic supply device can be arranged in the connector assembly 700 formed inside the housing 400. As a result, the electronic control unit 800 is lightened. In addition, the assembly and arrangement of the electronic control unit 800 can be facilitated.

[0100] Figure 5 It is a diagram showing a modified example of the hydraulic pressure supply device according to one embodiment of the present invention.

[0101] Reference Figure 5 In a modified example of the hydraulic supply device 1 of one embodiment of the present invention, the first magnet 500 may be disposed inside the wall of the piston 300. More specifically, the first magnet 500 may be disposed inside the wall of the piston body 310 of the piston 300. For example, the first magnet 500 may be formed integrally with the piston 300.

[0102] According to this modification, the first magnet 500 is not exposed to the outside, so corrosion of the first magnet 500 can be effectively prevented.

[0103] Figure 6 It is a diagram showing another modified example of the hydraulic pressure supply device according to one embodiment of the present invention.

[0104] Reference Figure 6 In a modified example of the hydraulic supply device 1 of one embodiment of the present invention, the first magnet 500 may be disposed on the outer peripheral surface of the piston 300. More specifically, the first magnet 500 may be disposed on the outer peripheral surface of the wall of the piston body 310 of the piston 300.

[0105] At this time, the first magnet 500 may be in a ring shape. Specifically, the inner diameter of the first magnet 500 may correspond to the outer diameter of the portion of the piston body 310 where the first magnet 500 is disposed.

[0106] According to this modification, it is not necessary to form a placement portion for arranging the first magnet 500 inside the piston 300. Thus, the structure of the piston 300 can be simplified. In addition, the processing efficiency of the piston 300 can be improved.

[0107] Figure 7 It is a diagram showing still another modified example of the hydraulic pressure supply device according to the embodiment of the present invention.

[0108] Compared to an embodiment of the present invention, Figure 7 The difference of the modified example of the hydraulic supply device 1 according to the embodiment of the present invention shown is that it does not have the first magnetic sensor 600 and the second magnetic sensor 650 separately, but has one magnetic sensor 600a.

[0109] exist Figure 7 In the modified example, the magnetic sensor 600a is arranged inside the guide 432 to detect the change of the magnetic field of the first magnet 500 based on the linear motion of the piston 300. At the same time, the magnetic sensor 600a is arranged on the rotating shaft of the rotor 130 to also detect the change of the magnetic field of the second magnet 550 rotating together with the rotor 130.

[0110] At this time, the magnetic sensor 600a may be disposed on the rotation axis of the rotor 130. In more detail, the magnetic sensor 600a may be disposed on the rotation axis of the screw 210 to be adjacent to the second magnet 550.

[0111] According to this modification, the magnetic field changes caused by the first magnet 500 and the magnetic field changes caused by the second magnet 550 can be measured simultaneously by one magnetic sensor 600a, so the number of magnetic sensors can be reduced. Thus, it is expected that economic efficiency can be improved by reducing the number of components.

[0112] An embodiment of the present invention is described above, but the concept of the present invention is not limited to the embodiment presented in this specification. Those skilled in the art who understand the concept of the present invention can easily propose other embodiments within the scope of the same concept by adding, changing, deleting, and appending structural elements, and these also belong to the scope of the concept of the present invention.

Claims

1. A hydraulic supply device, characterized in that: include: An electric motor, including a stator and a rotor; A motion conversion mechanism converts the rotational motion of the rotor into linear motion; a piston connected to the motion conversion mechanism to perform linear motion; The housing includes a cylinder and a guide member, wherein the piston is linearly movable in the cylinder, the guide member extends along the length direction of the cylinder and is inserted into the inner side of the piston, and the fluid pressurized by the piston is arranged in the space between the inner peripheral surface of the cylinder and the outer peripheral surface of the guide member; A first magnet, disposed on the piston; as well as The first magnetic sensor is disposed on the guide member to detect a change in the magnetic field of the first magnet due to the linear motion of the piston.

2. The hydraulic supply device according to claim 1, characterized in that: The first magnet is in a ring shape.

3. The hydraulic supply device according to claim 1, characterized in that: The first magnet is disposed inside the piston.

4. The hydraulic supply device according to claim 1, characterized in that: The piston includes a hollow piston body and a placement portion. The placement portion is sunken toward the outside in a radial direction on an inner peripheral surface of the piston body. The first magnet is disposed on the placement portion.

5. The hydraulic supply device according to claim 4, characterized in that: One side of the first magnet is supported by the step portion of the placement portion.

6. The hydraulic supply device according to claim 5, characterized in that: It also includes a guide bushing, which is arranged between the inner circumferential surface of the piston body and the outer circumferential surface of the guide member to guide the linear motion of the piston and is arranged to support the other side of the first magnet.

7. The hydraulic supply device according to claim 1, characterized in that: The first magnet is disposed on an outer surface of the piston.

8. The hydraulic supply device according to claim 1, characterized in that: Also included is a connector assembly, which is disposed inside the guide member.

9. The hydraulic supply device according to claim 1, characterized in that: The first magnetic sensor is connected to the connector assembly.

10. The hydraulic supply device according to claim 1, characterized in that: The invention also includes a second magnet, which is connected to the rotor, arranged on the rotating shaft of the rotor, and rotates together with the rotor.

11. The hydraulic supply device according to claim 10, characterized in that: The device further includes a second magnetic sensor disposed on the guide member to detect a change in a magnetic field caused by the rotation of the second magnet.

12. A hydraulic supply device, characterized in that: include: An electric motor, including a stator and a rotor; A motion conversion mechanism converts the rotational motion of the rotor into linear motion; a piston connected to the motion conversion mechanism to perform linear motion; The housing comprises a cylinder and a guide, wherein the piston is linearly movable in the cylinder, the guide extends along the length direction of the cylinder and is inserted into the interior of the piston, and the fluid pressurized by the piston is arranged in the space between the inner peripheral surface of the cylinder and the outer peripheral surface of the guide; A first magnet, disposed on the piston; A second magnet connected to the rotor, disposed on the rotating shaft of the rotor, and rotates together with the rotor; as well as The magnetic sensor is disposed on the guide member to detect a change in the magnetic field of the first magnet due to the linear motion of the piston or a change in the magnetic field of the second magnet due to the rotation of the rotor.

13. The hydraulic supply device according to claim 12, characterized in that: The first magnet is in a ring shape.

14. The hydraulic supply device according to claim 12, characterized in that: The piston includes a hollow piston body, and the first magnet is disposed on an inner peripheral surface of the piston body, an outer peripheral surface of the piston body, or an interior of the piston body.

15. The hydraulic supply device according to claim 12, characterized in that: It also includes a connector component, which is configured inside the guide member, and the magnetic sensor is connected to the connector component.

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