WO2022220463A1

WO2022220463A1 - Structure for motor and manufacturing method of same

Info

Publication number: WO2022220463A1
Application number: PCT/KR2022/004859
Authority: WO
Inventors: 이주성
Original assignee: 주식회사 만도
Priority date: 2021-04-16
Filing date: 2022-04-05
Publication date: 2022-10-20
Also published as: KR20220143501A

Abstract

Disclosed are a structure for a motor and a manufacturing method of same. The structure for a motor according to one embodiment comprises: a hollow housing having a first opening, which is open on a first surface facing a modulator block, and a second opening which is open on a second surface on the opposite side; a rotating shaft rotatably supported inside the housing; a rotor coupled to the rotating shaft to rotate together; a stator interacting with the rotor to rotate the rotating shaft when power is applied; a converter for converting the rotational force of the rotating shaft to linear motion; a bearing rotatably supporting the rotating shaft; and a bearing accommodation groove formed on the second surface of the housing and accommodating and supporting the bearing, wherein the bearing accommodation groove may be provided by bending the second surface and respectively supporting the inner lateral end and the outer lateral end of the bearing.

Description

Motor structure and manufacturing method thereof

The present invention relates to a motor structure and a manufacturing method thereof, and more particularly, to a motor structure applied to a vehicle brake system to operate a hydraulic piston, and a manufacturing method thereof.

A brake system for performing braking is essential to a vehicle, and various types of brake systems have been proposed for the safety of drivers and passengers.

Recently, as a next-generation brake system, an electromechanical brake system that receives a driver's braking intention as an electric signal and operates a motor based on the electric signal to provide braking force of the vehicle has been developed. Such an electromechanical brake system converts a rotational force of a motor into a linear motion of a hydraulic piston to form hydraulic pressure in a pressurized medium such as brake oil, and thereby performs vehicle braking.

In general, a motor includes a housing, a stator disposed inside the housing, a rotor disposed in the center of the stator and rotated by electromagnetic interaction with the stator to generate power and transmit it to a rotating shaft, and a rotor or a rotating shaft. A bearing or the like for rotatably supporting is provided.

As power is supplied to the stator, rotational force of the rotor and the rotating shaft is generated and provided, which is converted into linear motion of the hydraulic piston. Through this, the hydraulic piston moves forward to pressurize the pressurized medium, or the hydraulic piston moves backward to release the pressurization of the pressurized medium, and at this time, the motor receives a large load in the axial direction.

As described above, the large load applied in the axial direction according to the operation of the motor is transmitted to the bearing supporting the rotor or the rotating shaft, which may cause wear or noise of various component elements, and further may cause damage to the component elements. In addition, when a separate structure or component element is added to support a large load, there is a problem in that the manufacturing cost of the product increases and the manufacturing process becomes complicated.

An object of the present embodiment is to provide a motor structure capable of promoting structural stability of a product in spite of an axial load, and a method for manufacturing the same.

An object of the present embodiment is to provide a motor structure capable of suppressing and minimizing deformation of a bearing or a housing supporting a rotor or a rotating shaft, and a method of manufacturing the same.

An object of the present embodiment is to provide a motor structure with improved product performance and operational reliability, and a method for manufacturing the same.

An object of the present embodiment is to provide a motor structure with improved product rigidity and durability, and a method for manufacturing the same.

The present embodiment is intended to provide a motor structure in which the structure and manufacturing process can be simplified and a manufacturing method thereof.

An object of the present embodiment is to provide a motor structure capable of stably providing power for braking in various operating conditions of a vehicle and a method for manufacturing the same.

According to one aspect of the present invention, a hollow housing having a first opening that is openly formed on a first surface opposite to the modulator block, and a second opening that is openly formed on a second surface opposite to the modulator block; a rotation shaft rotatably supported inside the housing; a rotor coupled with the rotating shaft to rotate together; a stator which interacts with the rotor when power is applied to rotate the rotating shaft; a converter for converting the rotational force of the rotating shaft into linear motion; a bearing rotatably supporting the rotation shaft; and a bearing receiving groove formed on the second surface of the housing to accommodate and support the bearing, wherein the bearing receiving groove bends the second surface to support the inner end and the outer end of the bearing, respectively. can

The housing further includes a cylindrical body portion, and the bearing receiving groove has a bottom surface extending from the body portion toward the center, a first circumferential surface extending inwardly from the bottom surface, and the first A first bending part extending from the circumferential surface toward the center, bending and extending outward and periphery to support the inner end of the bearing, and extending outwardly from the first bending part to the outer circumferential surface of the bearing It may be provided, including an opposing second circumferential surface.

The bearing accommodating groove may be provided by further comprising a second bending part bent and extended from the second circumferential surface toward the center to support the outer end of the bearing and having the second opening provided at the center.

At least a portion of the bottom surface may be provided to include an inclined portion protruding outward toward the center.

The converter is coupled to the rotation shaft and rotates together, the screw shaft having a first screw thread on an outer circumferential surface, and a second screw thread meshing with the first screw thread on the inner circumferential surface, the ball connected to the piston member for pressing the pressurizing medium A nut may be included, and at least a portion of an outer end of the screw shaft may be exposed to the outside of the housing through the second opening.

A cover covering the exposed portion of the screw shaft and blocking the second opening may be provided.

The cover may include a stopper having a receiving space into which the exposed portion of the screw shaft is introduced, and a fastening portion for mounting the stopper to the housing.

The fastening part may be formed to extend outwardly in a radial direction from the circumference of the stopper, and the fastening part may be inserted between the inner surface of the second bending part and the outer end of the bearing.

The bearing may include an inner ring, an outer ring, and a plurality of balls interposed between the inner ring and the outer ring, and an inner circumferential surface of the second circumferential surface and an outer circumferential surface of the outer ring may be disposed to face each other.

The inner circumferential surface of the first circumferential surface and the outer circumferential surface of the second circumferential surface may be disposed to be in contact with each other or to face each other.

The first circumferential surface and the second circumferential surface may extend in a direction parallel to an axial direction of the rotation shaft.

The rotation shaft may be provided in a hollow shape, and at least a portion of the converter may be provided to be accommodated inside the rotation shaft.

The converter may further include a locking nut fastened to an outer end of the screw shaft, and the locking nut may be accommodated in the accommodating space.

The converter may further include an elastic washer interposed between the locking nut and the outer end of the bearing.

The housing may be provided by further comprising a mounting portion extending outwardly from the periphery of the first surface to form a support surface for the modulator block.

In the manufacturing method of the motor structure according to this embodiment, the step of entering and installing the stator in a first direction toward the inside from the first surface inside the housing; entering and installing the rotor and the rotation shaft in the first direction in the housing; forming a bearing receiving groove by bending the second surface of the housing; entering the bearing into the bearing receiving groove in a second direction from the second surface of the housing toward the inside; and supporting the bearing by bending an end of the bearing receiving groove to prevent separation of the bearing from the bearing receiving groove.

The bearing accommodating groove includes a bottom surface extending from the body portion toward the center, a first circumferential surface extending inwardly from the bottom surface, and a first circumferential surface extending from the first circumferential surface toward the center, the outer and A first bending part bent and extended to the peripheral side, and a second circumferential surface extending outwardly from the first bending part, wherein the step of entering the bearing includes bending the inner end of the bearing to the first bending It may be provided including the step of supporting the unit.

The supporting of the bearing may be provided by bending toward the center from the distal end of the second circumferential surface to form a second bending unit supporting the outer end of the bearing.

The motor structure may further include a cover for blocking the second opening, and the step of supporting the bearing may include installing the cover.

The cover includes a stopper having an accommodating space, and a fastening unit for mounting the stopper to the housing. It can be provided by forming.

The motor structure and the manufacturing method thereof according to the present embodiment can promote structural stability of the product despite the axial load applied according to the operation.

The motor structure and the manufacturing method thereof according to the present embodiment can suppress and minimize deformation of a bearing or a housing supporting a rotor or a rotating shaft.

The motor structure and the manufacturing method thereof according to the present embodiment may improve product performance and operational reliability.

The motor structure and the manufacturing method thereof according to the present embodiment may improve the product's robustness and durability.

The motor structure and the manufacturing method thereof according to the present embodiment can reduce manufacturing cost and improve productivity by simplifying the structure and manufacturing process.

The motor structure and the manufacturing method thereof according to the present embodiment can stably provide power for braking even in various operating situations of the vehicle.

1 is a perspective view showing a motor structure according to the present embodiment.

2 is a cross-sectional view showing a motor structure according to the present embodiment.

3 is a cross-sectional view showing a housing according to the present embodiment.

FIG. 4 is an enlarged cross-sectional view of part A of FIG. 2 .

5 is a cross-sectional view showing a housing according to a modified embodiment of the present invention.

6 to 10 are cross-sectional views sequentially illustrating a method of manufacturing a motor structure according to the present embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are presented in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited to the embodiments presented herein, and may be embodied in other forms. The drawings may omit the illustration of parts irrelevant to the description in order to clarify the present invention, and may slightly exaggerate the size of the components to help understanding.

1 is a perspective view showing the motor structure 1 according to the present embodiment, Figure 2 is a cross-sectional view showing the motor structure 1 according to the present embodiment.

1 and 2 , in the motor structure 1 according to the present embodiment, the first surface 111 on which the first opening 111a is formed and the second surface 112 on which the second opening 112a is formed. ) having a housing 110 provided in a hollow cylindrical shape, a rotating shaft 120 rotatably disposed inside the housing 110, and a rotor 130 that is coupled with the rotating shaft 120 and rotates together. , a stator 140 disposed inside the housing 110 and receiving power to rotate the rotating shaft 120 by interacting with the rotor 130, and a conversion device for converting the rotational force of the rotating shaft 120 into linear motion ( 150), a bearing 160 for rotatably supporting the rotating shaft 120, and a bearing receiving groove 170 provided on the second surface 112 of the housing 110 to accommodate and support the bearing 160, A cover 180 for blocking the second opening 112a may be included.

The housing 110 is provided to accommodate various component elements therein, and to mount them to a modulator block (not shown).

3 is a cross-sectional view showing the housing 110 according to the present embodiment. Referring to FIGS. 1 to 3 , the housing 110 includes a body part 115 in which component elements are accommodated and disposed therein, and a modulator block. From the periphery of the opposite or contacting first surface 111 and the second surface 112 provided on the opposite side of the first surface 111 and on which a bearing receiving groove 170 to be described later is formed, and the first surface 111 . It may include a mounting portion 118 that is firmly formed outside to form a support surface for the modulator block.

The body portion 115 may be provided in a hollow cylindrical shape so that the component element can be accommodated therein. In addition, a first opening 111a communicating with the inside of the body part 115 may be opened on the first surface 111 opposite to the modulator block, and a mounting part 118 may be formed around the first surface 111 . ) is extended to the outside, so that the housing 110 can be stably installed and supported on the modulator block. A screw shaft 151 of the converter 150, which will be described later, passes through the first opening 111a, or a piston 20 connected to the converter 150 and moving linearly can pass therethrough. The mounting portion 118 that is formed to the outside of the first surface 111 is provided in a plate shape, and a plurality of through holes 118a so that a fastening member such as a bolt passes through the mounting portion 118 and is fastened to the modulator block. can be provided.

A second surface 112 may be provided on the opposite side of the first surface 111 , and a second opening 112a communicating with the inside of the body portion 115 may be provided on the second surface 112 . The second opening 112a may be formed on the center side of the second bending part 175 of the bearing receiving groove 170 to be described later, and the second opening 112a is a screw shaft of the converter 150 to be described later. A portion of the outer end of the 151 may pass through and be exposed to the outside of the housing 110 . As the second surface 112 is bent, a bearing receiving groove 170 to be described later may be provided, and a detailed description thereof will be described later.

On the other hand, the inner or inner end described in this embodiment means an upper or upper end relatively adjacent to the modulator block to which the motor structure 1 is mounted with reference to FIGS. 2 and 3 , and the outer or outer end is shown in FIG. 2 and a lower or lower end relatively adjacent to the outside of the motor structure 1 with reference to FIG. 3 . The inner (medial end) or outer (lateral end) refers to a relative position to help understand the present invention, and does not limit a specific direction or a specific region.

The stator 140 may be disposed inside the body 115 , and may receive power and an electrical signal through the connector 10 to generate rotational force of the rotor 130 and the rotating shaft 120 , which will be described later.

Referring to FIG. 2 , the stator 140 may include a stator core, a coil wound around the stator core to form a rotating magnetic field, and an insulator disposed between the stator core and the coil. The rotor 130 is disposed on the inner circumferential side of the stator 140 and is provided to rotate together with the rotation shaft 120 in combination with the rotation shaft 120 to be described later. The rotor 130 may include a magnet, thereby rotating by interaction with the stator 140 when power is applied to the stator 140 . The stator 140 and the rotor 130 may have a known structure and device, and are not limited to any one structure and method.

The rotating shaft 120 may be rotatably disposed inside the housing 110 , and may be coupled to the rotor 130 to rotate together. The rotating shaft 120 may be formed to extend along the axial direction and may be provided in a hollow cylindrical shape, and the outer circumferential surface may be coupled with the inner circumferential surface of the rotor 130 to rotate together with the rotor 130 . At least a portion of the converter 150 and the piston 20 to be described later may be retracted or accommodated inside the rotation shaft 120 , and one end of the rotation shaft 120 is a screw shaft of the converter 150 to be described later. It can be combined with (151) to rotate together. That is, the rotor 130, the rotating shaft 120, and the screw shaft 151 are provided to be coupled to each other so that they can rotate integrally. The rotation shaft 120 may be rotationally supported by a bearing 160 to be described later, and a detailed description thereof will be described later.

The converter 150 is provided to convert the rotational force of the rotor 130 and the rotating shaft 120 into a linear motion of the piston 20 .

Referring to FIG. 2 , the converter 150 includes a screw shaft 151 that is coupled with a rotating shaft 120 to rotate together, and a ball nut that is screwed to the screw shaft 151 to advance and retract the piston 20 ( 152). The screw shaft 151 may be formed to extend along the axial direction inside the rotation shaft 120 , and a first screw thread 151a may be formed on an outer circumferential surface. At least a portion of the outer end of the screw shaft 151 may be exposed to the outside through the second opening 112a of the housing 110 , and a locking nut 153 is fastened to the outer end of the screw shaft 151 . Axial movement or play can be prevented. The locking nut 153 may be press-fitted to the outer end of the screw shaft 151 , and the locking nut 153 may be disposed inside the receiving space 181a of the cover 180 to be described later. On the other hand, an elastic washer 154 is interposed between the inner end of the locking nut 153 and the outer end of the bearing 160 to be described later, thereby suppressing a sudden increase in the load between the component elements and preventing damage to the component elements.

The ball nut 152 is provided in a hollow cylindrical shape and a screw shaft 151 is disposed inside, and on the inner circumferential surface of the ball nut 152, a second thread that meshes with the first thread 151a of the screw shaft 151 ( 152a) may be formed. The ball nut 152 may be disposed inside the hollow case, and rotation of the ball nut 152 is prevented by a rotation preventing part (not shown) provided between the ball nut 152 and the hollow case, thereby preventing the screw shaft ( The rotational force of 151 is converted into linear motion of the ball nut 152 to advance and retreat the piston 20 . To this end, the inner end of the ball nut 152 is provided in connection with the piston 20 .

When describing the operation of the converter 150 , when the stator 140 receives power and an operation signal, the rotor 130 and the rotation shaft 120 are rotated in one direction according to the transmission. Since the rotating shaft 120 and the screw shaft 151 rotate together integrally, the screw shaft 151 also rotates in one direction, and the rotational force of the screw shaft 151 is transmitted to the ball nut 152 . Since the ball nut 152 is in a state in which the rotation is prevented by the anti-rotation part, it moves forward by receiving the rotational force of the screw shaft 151 in one direction, and the piston 20 connected to the ball nut 152 also advances together to provide brake oil. A braking pressure may be generated by pressurizing a pressurizing medium, such as. On the contrary, when the stator 140 receives the power and the operation release signal, it rotates the rotor 130 and the rotation shaft 120 in the other direction opposite to one direction. Accordingly, the screw shaft 151 also rotates in the other direction, and its rotational force is transmitted to the ball nut 152 . The ball nut 152 is retracted by receiving the rotational force in the other direction of the screw shaft 151, and the piston 20 connected to the ball nut 152 also retreats together to lower the hydraulic pressure of the pressurized medium to release the braking pressure. .

The bearing 160 rotatably supports the rotation shaft 120 . 4 is an enlarged cross-sectional view of part A of FIG. 2 . Referring to FIGS. 2 and 4 , the bearing 160 has a bearing receiving groove 170 to be described later provided on the second surface 112 of the housing 110 . ) is accommodated and supported to promote the rotation of the rotating shaft 120, and can suppress wear and noise between components. The bearing 160 may include an inner ring 161 , an outer ring 162 , and a plurality of balls 163 interposed between the inner ring 161 and the outer ring 162 . The outer circumferential surface of the outer ring 162 may be disposed opposite to the second circumferential surface 174 of the bearing receiving groove 170 to be described later, and the inner circumferential surface of the inner ring 161 is provided so as to face and contact the rotary shaft 120 . The rotation of 120 can be supported. In addition, an elastic washer 154 may be supported on the outer end of the inner ring 161 .

Such a bearing 160 generates a load in a direction parallel to the axial direction according to the operation of the motor. Specifically, when the rotor 130, the rotating shaft 120, and the screw shaft 151 rotate in one direction by the application of power to the stator 140, the ball nut 152 and the piston 20 move forward and the pressurized medium will pressurize At this time, a large load is generated in the retraction direction on the piston 20 and the ball nut 152 and the screw shaft 151 meshed therewith as a repulsive force against the pressurization of the pressurizing medium. This may be transmitted to the housing 110 through the bearing 160 to generate an axial deformation of the housing 110 . Therefore, a method for stably supporting the bearing 160 on the housing 110 so that the bearing 160 can effectively withstand the axial load and minimizing and suppressing the amount of deformation in the axial direction of the housing 110 is required.

The bearing accommodating groove 170 is provided by bending the second surface 112 of the housing 110 to accommodate the bearing 160 and support it firmly and stably to minimize the amount of axial deformation of the housing 110 and can be suppressed

2 to 4, the bearing receiving groove 170 is provided on the second surface 112 of the housing 110, the bottom surface 171 extending toward the center from the body portion 115, and, A first circumferential surface 172 extending inwardly from the bottom surface 171 and extending from the first circumferential surface 172 toward the center are bent and extended to the outside and peripheral sides, and the inner side of the bearing 160 . A first bending part 173 for supporting the end, a second circumferential surface 174 extending outwardly from the first bending part 173 and facing the outer circumferential surface of the bearing 160, and a second circumferential surface ( The second bending portion 175 may be bent and extended from the 174 to the center to support the outer end of the bearing 160 .

The center to be described below refers to a position or direction relatively adjacent to the center in which the screw shaft 151 is disposed with reference to FIGS. 2 to 4 , and the periphery is the body of the housing 110 based on FIGS. 2 to 4 . It means a position or direction relatively adjacent to the periphery on which the portion 115 is disposed. The center or periphery refers to a relative position or direction to help understand the present invention, and does not limit a specific direction or a specific region.

The bottom surface 171 may be formed to extend toward the center from the outer end of the body portion 115 of the housing 110 . The bottom surface 171 may be provided with an inclined portion 171a that is formed to protrude outward (lower side with respect to FIG. 4 ) toward the center. The amount of deformation in the axial direction of the housing 110 may be further reduced by the inclined portion 171a. The inclined portion 171a may be provided over the entire bottom surface 171 as shown in FIGS. 2 to 4 , but may be formed only in a portion of the space according to the space utilization of the vehicle.

5 is a cross-sectional view showing the housing 110 according to a modified embodiment of the present invention. Referring to FIG. 5 , the bottom surface 171 of the bearing receiving groove 170 is provided with an inclined portion 171a, but the inclined portion (171a) may be formed only on a part of the bottom surface (171). As described above, the amount of deformation in the axial direction of the housing 110 may be reduced by the inclined portion 171a of the bottom surface 171, but in consideration of the space utilization of the vehicle in which the motor structure 1 is installed, the inclined portion ( 171a) is formed on the peripheral side, which is a portion of the bottom surface 171, and the bottom surface 171 except for this is flatly disposed to facilitate the packaging and arrangement of the housing 110 or the motor structure 1 may be

The first circumferential surface 172 may be formed to extend from the bottom surface 171 toward the inside (upper side with reference to FIG. 4 ). The first circumferential surface 172 may be bent and extended inward from the end of the bottom surface 171 in a direction parallel to the axial direction to form a cylindrical shape. The inner circumferential surface of the first circumferential surface 172 may be disposed to face or contact the outer circumferential surface of the second circumferential surface 174 to be described later.

The first bending part 173 may be bent and extended toward the center from the first circumferential surface 172 to support the inner end of the bearing 160 . Specifically, the first bending part 173 is bent and extended from the end of the first circumferential surface 172 toward the center, and then sequentially bent and extended to the outside and the periphery, thereby forming the inner end of the bearing 160 . It can be supported in contact with at least a part. 2 and 4, the outer surface of the first bending part 173 is shown to directly contact and support the inner end of the bearing 160, but is not limited thereto, and a washer or a damping member is interposed therebetween. Thus, the first bending part 173 may indirectly support the inner end of the bearing 160 .

The second circumferential surface 174 may be formed to extend outside (lower side with reference to FIG. 4 ) from the first bending part 173 . The second circumferential surface 174 is bent and extended outwardly from the end of the first bending part 173 in a direction parallel to the axial direction to form a cylindrical shape, and is relatively central to the first circumferential surface 172 . By being positioned at the outer peripheral surface of the second peripheral surface 174 may be disposed to face or contact the inner peripheral surface of the first peripheral surface 172 to each other. In addition, as the second circumferential surface 174 is relatively centered than the first circumferential surface 172 , the inner circumferential surface of the second circumferential surface 174 is disposed to face the outer circumferential surface of the bearing 160 .

The second bending part 175 may be bent and extended from the second circumferential surface 174 toward the center. The second bending part 175 may be bent and extended from the end of the second circumferential surface 174 toward the center, thereby supporting the outer end of the bearing 160 . In FIGS. 2 and 4 , a fastening part 182 of a cover 180 to be described later is interposed between the second bending part 175 and the bearing 160 to indirectly contact and support it, but it is not limited thereto. Without the member, the inner surface of the second bending part 175 and the outer end of the bearing 160 may directly contact and support the same. The center of the second bending part 175 is formed through the second opening 112a of the housing 110 , and a portion of the outer end of the screw shaft 151 passes through the second opening 112a to be exposed. and the second opening 112a may be sealed by a cover 180 to be described later.

The bearing receiving groove 170 formed on the second surface 112 of the housing 110 may be provided integrally with the housing 110 . In other words, instead of manufacturing the bearing receiving groove 170 as a separate member and then coupling it to the housing 110, the housing 110 is manufactured through bending and forming to be integrally formed as a single member. By doing so, the structure and process can be further simplified. In addition, by bending the inner and outer portions of the bearing receiving groove 170 to stably and firmly support the inner and outer ends of the bearing 160 , the amount of deformation due to the load applied to the bearing 160 and the housing 110 is minimized. can In addition, by forming the bottom surface 171 of the bearing receiving groove 170 to be inclined, the amount of deformation of the housing 110 can be further suppressed.

The cover 180 is provided to seal the second opening 112a formed on the second surface 112 of the housing 110 . Referring to FIG. 4 , the cover 180 is installed on the second surface 112 of the housing 110 to seal the second opening 112a and is exposed to the outside through the second opening 112a. It is provided to cover the outer end of the screw shaft 151 . The cover 180 may include a stopper portion 181 having an accommodation space 181a and a fastening portion 182 for mounting the stopper portion 181 to the housing 110 .

The stopper 181 has a receiving space 181a therein, and the exposed portion of the screw shaft 151, a locking nut 153, and an elastic washer 154 are introduced into the receiving space 181a. can The stopper 181 may be provided in the form of an empty hollow inside so that the receiving space 181a may be formed, and the outer end may be provided in a closed shape. A fastening part 182 that is formed to extend or extend outwardly in the periphery or radial direction to be mounted on the housing 110 may be provided around the periphery of the stopper 181 . The fastening part 182 may be inserted and supported in the bearing receiving groove 170 to install and fix the cover 180 to the housing 110 . Specifically, the fastening portion 182 is inserted and interposed between the inner surface of the second bending portion 175 and the outer end of the bearing 160 , so that the cover 180 may be fixedly installed on the housing 110 .

Hereinafter, a method of manufacturing the motor structure according to the present embodiment will be described.

6 to 10, the manufacturing method of the motor structure includes the steps of entering and installing the stator 140 in a first direction inside the housing 110, and a rotor ( 130) and the step of entering and installing the rotating shaft 120, bending the second surface 112 of the housing 110 to form the bearing receiving groove 170, in the second direction in the bearing receiving groove 170 It includes the step of entering the bearing 160 , and bending the bearing receiving groove 170 to support the bearing 160 .

The stator 140 , the rotor 130 , and the rotation shaft 120 may be installed inside the housing 110 by entering in the first direction. The stator 140 , the rotor 130 , and the rotation shaft 120 are in the direction toward the inside from the first surface 111 through the first opening 111a formed in the first surface 111 of the housing 110 . It can be entered and installed inside the housing 110 by entering in one direction (a downward direction with respect to FIG. 6 ) (see FIG. 6 ).

A bearing 160 is provided on the second surface 112 side of the housing 110 to facilitate smooth rotation of the rotating shaft 120 and support the rotating shaft 120 at the same time, and the bearing 160 is mounted to the housing 110 . The bearing receiving groove 170 is formed by bending the second surface 112 of the housing 110 so as to be stably accommodated and supported in the . The bearing receiving groove 170 has a bottom surface 171 excluding the second bending portion 175, a first circumferential surface 172, and a first bending portion 173 so that the bearing 160 can easily enter the inside. And the second circumferential surface 174 may be formed in a linear fashion (see FIG. 6). The step of forming the bearing receiving groove 170 includes forming a bottom surface 171 extending from the body portion 115 of the housing 110 toward the center, and suppressing the amount of deformation in the axial direction of the housing 110 and Forming an inclined portion 171a in which at least a portion of the bottom surface 171 protrudes outward to minimize, and extending the first circumferential surface 172 inward from the end of the bottom surface 171 and forming a first bending portion 173 extending from the end of the first circumferential surface 172 toward the center and bent outward and peripherally to support the inner end of the bearing 160; 1 It may include forming a second circumferential surface 174 extending outwardly from the end of the bending portion 173 . On the other hand, the bearing accommodating groove 170 is formed before the stator 140, the rotor 130, and the rotating shaft 120 are entered and installed in the housing 110, thereby making the process of forming the bearing accommodating groove 170 more smoothly. can proceed

After the bearing accommodating groove 170 is formed on the second surface 112 of the housing 110 , the bearing 160 may be installed by entering the bearing accommodating groove 170 in the second direction. The bearing 160 moves in a second direction (upward direction based on FIG. 7 ) that is a direction from the second surface 112 to the inside through the second opening 112a formed in the second surface 112 of the housing 110 . ) and can be entered and installed inside the bearing accommodating groove 170 . At this time, the outer end of the screw shaft 151 passes through the inner ring 161 of the bearing 160 , and the inner end of the bearing 160 has a first bending portion 173 of the bearing receiving groove 170 . It can be supported on the outer surface of the (see FIG. 7).

Thereafter, the bearing 160 may be supported by bending the end of the bearing receiving groove 170 to prevent the bearing 160 from being separated from the bearing receiving groove 170 . Specifically, after entering the bearing 160 into the bearing receiving groove 170 to support the inner end of the bearing 160 on the outer surface of the first bending part 173, the second circumferential surface 174 By bending the end portion toward the center, the outer end of the bearing 160 is supported by the second bending portion 175 to prevent separation of the bearing 160 (see FIG. 10 ).

Meanwhile, the forming of the second bending part 175 may include installing the cover 180 blocking the second opening 112a. Specifically, the elastic washer 154 and locking at the outer end of the screw shaft 151 exposed to the outside through the second opening 112a before forming the second bending part 175 to support the bearing 160 The screw shaft 151 may be supported by fastening the nut 153 (see FIG. 8 ). Then, the cover 180 enters the second direction toward the second opening 112a, and the outer end of the screw shaft 151 and the elastic washer 154 and locking in the receiving space 181a of the stopper 181 . While the nut 153 is introduced and accommodated, the fastening part 182 is disposed so as to be in contact with the outer end of the bearing 160 (see FIG. 9 ). After the fastening portion 182 of the cover 180 is brought into contact with the outer end of the bearing 160, the end portion of the second circumferential surface 174 is bent or bent to form the second bending portion 175 (see FIG. 10). By doing so, the bearing 160 can be supported in the bearing receiving groove 170 and the cover 180 can be installed.

Claims

A hollow housing having a first opening formed openly on a first surface opposite to the modulator block and a second opening formed openly on a second surface opposite to the modulator block;

a rotation shaft rotatably supported inside the housing;

a rotor coupled with the rotating shaft to rotate together;

a stator which interacts with the rotor when power is applied to rotate the rotating shaft;

a converter for converting the rotational force of the rotating shaft into linear motion;

a bearing rotatably supporting the rotation shaft; and

and a bearing receiving groove formed on the second surface of the housing to receive and support the bearing.

The bearing receiving groove is

A motor structure for supporting an inner end and an outer end of the bearing by bending the second surface, respectively.
According to claim 1,

The housing further includes a cylindrical body,

The bearing receiving groove is

a bottom surface extending from the body part toward the center;

a first circumferential surface extending inwardly from the bottom surface;

a first bending part extending from the first circumferential surface toward the center, bending and extending outward and periphery to support the inner end of the bearing;

and a second circumferential surface extending outwardly from the first bending part and facing the outer circumferential surface of the bearing.
3. The method of claim 2,

The bearing receiving groove is

The motor structure further comprising: a second bending part bent and extended from the second circumferential surface toward the center to support the outer end of the bearing and having the second opening provided at the center.
4. The method of claim 3,

the bottom surface

At least a portion of the motor structure including a slope that is formed to protrude outward toward the center.
4. The method of claim 3,

The converter is

a screw shaft coupled with the rotating shaft to rotate together and having a first screw thread on an outer circumferential surface;

and a ball nut having a second screw thread meshing with the first screw thread on the inner circumferential surface and connected to the piston member for pressing the pressurizing medium,

The screw shaft is

At least a portion of the outer end of the motor structure is exposed to the outside of the housing through the second opening.
6. The method of claim 5,

and a cover covering the exposed portion of the screw shaft and blocking the second opening.
7. The method of claim 6,

the cover is

a stopper having an accommodation space into which the exposed portion of the screw shaft is introduced;

A motor structure including a fastening part for mounting the stopper to the housing.
8. The method of claim 7,

The fastening part

Doedoe extending outwardly along the radial direction from the periphery of the stopper,

The fastening part

A motor structure inserted between the inner surface of the second bending part and the outer end of the bearing.
5. The method of claim 4,

the bearing is

An inner ring, an outer ring, and a plurality of balls interposed between the inner ring and the outer ring,

The inner circumferential surface of the second circumferential surface and the outer circumferential surface of the outer ring are

Motor structures disposed opposite to each other.
10. The method of claim 9,

The inner circumferential surface of the first circumferential surface and the outer circumferential surface of the second circumferential surface are

Motor structures disposed in contact with each other or facing each other.
3. The method of claim 2,

The first circumferential surface and the second circumferential surface are

A motor structure extending in a direction parallel to the axial direction of the rotation shaft.
6. The method of claim 5,

The rotation shaft is provided in a hollow shape,

At least a portion of the converter is a motor structure that is provided to be accommodated inside the rotation shaft.
9. The method of claim 8,

The converter is

Further comprising a locking nut fastened to the outer end of the screw shaft,

The locking nut is a motor structure accommodated in the accommodation space.
14. The method of claim 13,

The converter is

Motor structure further comprising an elastic washer interposed between the locking nut and the outer end of the bearing.
5. The method of claim 4,

the housing is

The motor structure further comprising a mounting portion extending outwardly from the periphery of the first surface to form a support surface for the modulator block.
In the manufacturing method of the motor structure according to claim 1,

entering and installing the stator in a first direction from the first surface toward the inside of the housing;

entering and installing the rotor and the rotation shaft in the first direction in the housing;

forming a bearing receiving groove by bending the second surface of the housing;

entering the bearing into the bearing receiving groove in a second direction from the second surface of the housing toward the inside; and

Supporting the bearing by bending an end of the bearing accommodating groove to prevent separation of the bearing from the bearing accommodating groove.
17. The method of claim 16,

The bearing receiving groove is

A bottom surface extending toward the center from the body portion, a first circumferential surface extending inwardly from the bottom surface, and a first circumferential surface extending from the first circumferential surface toward the center, bent and extended to the outside and the periphery It includes a first bending portion formed and a second circumferential surface extending outwardly from the first bending portion,

The step of entering the bearing is

The method of manufacturing a motor structure comprising the step of supporting the inner end of the bearing to the first bending part.
18. The method of claim 17,

The step of supporting the bearing is

The method of manufacturing a motor structure comprising the step of forming a second bending portion bent toward the center from the end of the second circumferential surface to support the outer end of the bearing.
19. The method of claim 18,

The motor structure further comprises a cover for blocking the second opening,

The step of supporting the bearing is

Method of manufacturing a motor structure comprising the step of installing the cover.
20. The method of claim 19,

The cover includes a stopper having an accommodation space, and a fastening portion for mounting the stopper to the housing,

The step of installing the cover

A method of manufacturing a motor structure in which the second bending part is formed after disposing the fastening part in contact with the outer end of the bearing.