CN219499065U

CN219499065U - Rotor assembly for EPS brushless motor

Info

Publication number: CN219499065U
Application number: CN202320703169.8U
Authority: CN
Inventors: 闵智; 周毅; 吕健
Original assignee: Guangdong Powerful Motor Co ltd
Current assignee: Guangdong Powerful Motor Co ltd
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-08-08
Anticipated expiration: 2033-03-31

Abstract

The utility model discloses a rotor assembly for an EPS brushless motor, which comprises a rotor, a mounting seat, a screw rod, balls and magnetic steel, wherein the rotor is provided with a hole cavity along the axial direction of the rotor, and the hole cavity extends from the left end of the rotor to the right end of the rotor; the mounting seat is fixedly connected with the left end or the right end of the rotor, the mounting seat is provided with a communication cavity communicated with the cavity, and the inner wall of the communication cavity is provided with a spiral first ball groove; the screw rod is arranged in the hole cavity and the communicating cavity in a left-right movable way, a spiral second ball groove is formed in the outer surface of the screw rod, and the first ball groove and the second ball groove form a ball channel; a plurality of balls are arranged in the ball channel; the magnet steel is installed on the surface of rotor. The rotor is of a hollow structure, is a part of a magnetic circuit of motor magnetic steel and is a driving piece for driving the screw rod to rotate, so that the rotor assembly is compact in structure, occupied space is saved, and the weight of the EPS brushless motor is reduced; the ball and the ball channel are adopted to drive the screw rod to move left and right, so that large torque can be transmitted.

Description

Rotor assembly for EPS brushless motor

Technical Field

The utility model relates to the field of brushless motor manufacturing, in particular to a rotor assembly for an EPS brushless motor.

Background

With the rapid development of the automobile industry and the deepening of energy crisis consciousness, people have a higher and higher attention to automobile energy conservation. The steering performance of the automobile is an important performance in the running process of the automobile, the power-assisted steering system is also updated continuously, the power-assisted motor directly provides steering assistance for the electric power-assisted steering system, and a power steering oil pump, a hose, hydraulic oil, a conveyor belt and a belt pulley arranged on an engine which are necessary for the hydraulic power-assisted steering system are omitted, so that the advantages of energy conservation, environment friendliness, interference resistance, safety and steering stability become one of the key points of the development of the steering system and the development of the automobile technology.

The electric power steering system comprises C-EPS, P-EPS and R-EPS, and with the advent of large and medium-sized vehicles, the higher requirements are put forward on the R-EPS structure, if the torque of a brushless motor is required to be large, the weight is light, and the rotor of the existing EPS brushless motor is a solid shaft, so that the motor is heavy and cannot transmit larger torque, and further the power steering requirement of the large and medium-sized vehicles cannot be met.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the present utility model proposes a rotor assembly for an EPS brushless motor that is light in weight and capable of transmitting a large torque.

According to a first aspect of the present utility model, a rotor assembly for an EPS brushless motor includes a rotor, a mount, a screw, balls, and magnetic steel, the rotor being provided with a bore along an axial direction thereof, the bore extending from a left end of the rotor to a right end of the rotor; the mounting seat is fixedly connected with the left end or the right end of the rotor, the mounting seat is provided with a communication cavity communicated with the cavity, and the inner wall of the communication cavity is provided with a spiral first ball groove; the screw rod can be arranged in the hole cavity and the communication cavity in a left-right moving way, a spiral second ball groove is formed in the outer surface of the screw rod, and the first ball groove and the second ball groove form a ball channel; a plurality of balls disposed in the ball passage; the magnetic steel is arranged on the outer surface of the rotor.

The rotor assembly for the EPS brushless motor has at least the following technical effects: the rotor is of a hollow structure, the rotor drives the screw rod to move left and right through the ball channel and the ball, and further torque of the R-EPS motor is transmitted, so that power steering of the automobile is completed, the rotor is a part of a magnetic steel magnetic circuit of the motor and is a driving piece for driving the screw rod to rotate, the rotor can drive the screw rod to move left and right without a complex structure, the rotor assembly is compact in structure, occupied space is saved, and weight of the EPS brushless motor is reduced; the ball and the ball channel are adopted to drive the screw rod to move left and right, so that large torque can be transmitted.

According to some embodiments of the utility model, the rotor comprises a plurality of mounting brackets, wherein the plurality of mounting brackets are annular, the plurality of mounting positions are arranged on the mounting brackets along the circumferential direction of the mounting brackets, the plurality of magnetic steels are respectively mounted on the plurality of mounting positions, and the mounting brackets are sleeved on the rotor.

According to some embodiments of the utility model, the plurality of mounting locations are evenly distributed on the mounting bracket along a circumferential direction of the mounting bracket.

According to some embodiments of the utility model, the mounting location is a groove, and the shape of the magnetic steel is matched with the shape of the groove.

According to some embodiments of the utility model, the notch of the groove is narrow at the upper part and wide at the lower part.

According to some embodiments of the utility model, the rotor comprises a first shaft section and a second shaft section, the first shaft section having a smaller diameter than the second shaft section, the mounting bracket being mounted on the first shaft section.

According to some embodiments of the utility model, the diameter of the communication cavity is the same as the diameter of the bore.

According to some embodiments of the utility model, the mounting seat is connected with a connecting part, a concave position is arranged in the connecting part, the diameter of the concave position is larger than that of the communication cavity, and the rotor is mounted on the concave position.

According to some embodiments of the utility model, the portion of the rotor connected to the recess is an interference fit with the recess.

According to some embodiments of the utility model, the mounting bracket is made of injection molded material.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

Additional aspects and advantages of the present utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a cross-sectional view of a rotor assembly for an EPS brushless motor in accordance with an embodiment of the utility model;

FIG. 2 is an exploded view of a rotor assembly for an EPS brushless motor;

FIG. 3 is a cross-sectional view of a rotor;

FIG. 4 is a schematic view of the structure of the mounting base;

FIG. 5 is a schematic structural view of a screw;

FIG. 6 is a schematic view of a plurality of magnetic steels mounted on a mounting bracket;

FIG. 7 is an exploded view of a magnetic steel and a mounting bracket;

FIG. 8 is a cross-sectional view of A-A of FIG. 1;

fig. 9 is an enlarged view at B in fig. 1.

Reference numerals: rotor 100, bore 110, first shaft section 120, second shaft section 130, mount 200, communication chamber 210, first ball groove 220, connection 230, recess 231, lead screw 300, second ball groove 310, ball channel 320, ball 400, magnetic steel 500, mount bracket 600, mount 610, notch 611.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the utility model.

In the description of the present utility model, plural means two or more, and greater than, less than, exceeding, etc. are understood to exclude this number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1 and 2, a rotor assembly for an EPS brushless motor according to an embodiment of the present utility model includes a rotor 100, a mount 200, a screw 300, balls 400, and magnetic steel 500.

As shown in fig. 3, the rotor 100 is provided with a bore 110 along an axial direction thereof, the bore 110 extending from a left end of the rotor 100 to a right end of the rotor 100.

As shown in fig. 1, the mounting seat 200 is fixedly connected with the left end of the rotor 100, and as shown in fig. 1 and 4, the mounting seat 200 is provided with a communication cavity 210 communicated with the cavity 110, the inner wall of the communication cavity 210 is provided with a spiral first ball groove 220, and the concave shape of the first ball groove 220 is matched with the shape of the ball 400.

As shown in fig. 1, the screw 300 is movably disposed in the cavity 110 and the communication cavity 210 in a left-right direction, the screw 300 can transmit torque, as shown in fig. 1 and 5, the screw 300 is provided with a spiral second ball groove 310 on the outer surface, the shape of the second ball groove 310 is matched with the shape of the ball 400, and as shown in fig. 1, the first ball groove 220 and the second ball groove 310 form a ball channel 320.

As shown in fig. 1, a plurality of balls 400 are disposed in the ball passage 320; the magnetic steel 500 is mounted on the outer surface of the rotor 100.

In operation, the rotor 100 rotates, and the balls 400 move along the ball path 320, so that the balls 400 drive the screw 300 to reciprocate left and right. Specifically, the rotor 100 is made of Q235 or a magnetically conductive material, and the rotor 100 has a hollow cylindrical shape.

The rotor 100 is of a hollow structure, the rotor 100 drives the screw rod 300 to move left and right through the ball channel 320 and the ball 400, and then the torque of the R-EPS motor is transmitted, so that the power steering of the automobile is completed, the rotor 100 is a part of a magnetic circuit of the motor magnetic steel 500 and is a driving piece for driving the screw rod 300 to rotate, the rotor 100 can drive the screw rod 300 to move left and right without a complex structure, the rotor assembly is compact in structure, occupied space is saved, and the weight of the EPS brushless motor is reduced; the balls 400 and the ball passages 320 are used to drive the screw 300 to move left and right, so that a large torque can be transmitted.

In some embodiments of the present utility model, as shown in fig. 6 and 7, the present utility model further includes a plurality of annular mounting brackets 600, the plurality of magnetic steels 500 are provided, the mounting brackets 600 are provided with a plurality of mounting positions 610 along the circumferential direction thereof, the plurality of magnetic steels 500 are respectively mounted on the plurality of mounting positions 610, the mounting brackets 600 are sleeved on the rotor 100, and the magnetic steels 500 are fixed on the rotor 100 through the mounting brackets 600 so as to prevent the magnetic steels 500 from moving when the rotor 100 rotates; the mounting bracket 600 may be adhered to the rotor 100 by glue.

In a further embodiment of the present utility model, as shown in fig. 6 and 7, a plurality of mounting locations 610 are uniformly distributed on the mounting bracket 600 along the circumferential direction of the mounting bracket 600, so that the magnetic steels are uniformly distributed on the outer circumference of the hollow shaft of the rotor 100, thereby making the magnetic circuit of the rotor 100 circumferentially symmetrical, and thus achieving the purpose of reducing the torque ripple value of the motor.

In a further embodiment of the present utility model, as shown in fig. 8, the mounting location 610 is a groove, and the shape of the magnetic steel 500 is matched with the shape of the groove, so as to facilitate mounting of the magnetic steel 500.

In a further embodiment of the present utility model, as shown in fig. 8, the notch 611 of the groove is narrow at the upper side and wide at the lower side, so that the magnetic steel 500 does not move in the circumferential direction of the rotor 100 and the magnetic steel 500 is easily installed.

In a further embodiment of the present utility model, as shown in fig. 3 and 9, the rotor 100 includes a first shaft section 120 and a second shaft section 130, the diameter of the first shaft section 120 is smaller than that of the second shaft section 130, the mounting bracket 600 is mounted on the first shaft section 120, and when the mounting bracket 600 is mounted, the mounting bracket 600 is sleeved on the first shaft section 120, and then the mounting bracket 600 is positioned against the end face of the second shaft section 130, so as to facilitate positioning the mounting bracket 600.

In some embodiments of the present utility model, as shown in fig. 1, the diameter of the communication cavity 210 is the same as that of the bore 110, so that the screw 300 has a simple structure and is convenient to process.

In a further embodiment of the present utility model, as shown in fig. 1, a connecting portion 230 is connected to the right end of the mounting base 200, a recess 231 is provided in the connecting portion 230, the diameter of the recess 231 is larger than that of the communication cavity 210, the rotor 100 is mounted on the recess 231, and the recess 231 is provided to facilitate assembling the rotor 100 and the mounting base 200.

In a further embodiment of the present utility model, the portion of the rotor 100 connected to the recess 231 is an interference fit with the recess 231 to better transmit torque.

In a further embodiment of the present utility model, the mounting bracket 600 is made of injection molded material to make the brushless motor lightweight.

In the description of the present specification, reference to the term "some embodiments" or "what may be considered to be" etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor assembly for an EPS brushless motor, comprising:

a rotor having a bore formed along an axial direction thereof, the bore extending from a left end of the rotor to a right end of the rotor;

the mounting seat is fixedly connected with the left end or the right end of the rotor and is provided with a communication cavity communicated with the cavity, and the inner wall of the communication cavity is provided with a spiral first ball groove;

the screw rod can be arranged in the hole cavity and the communication cavity in a left-right movable way, a spiral second ball groove is formed in the outer surface of the screw rod, and the first ball groove and the second ball groove form a ball channel;

a plurality of balls disposed in the ball passage;

and the magnetic steel is arranged on the outer surface of the rotor.

2. A rotor assembly for an EPS brushless motor as claimed in claim 1, wherein: still including being annular installing support, the magnet steel is equipped with a plurality ofly, the installing support is equipped with a plurality of installation positions along its circumferencial direction, a plurality of the magnet steel is installed respectively in a plurality of on the installation position, the installing support cover is located on the rotor.

3. A rotor assembly for an EPS brushless motor as claimed in claim 2, wherein: the mounting positions are uniformly distributed on the mounting bracket along the circumferential direction of the mounting bracket.

4. A rotor assembly for an EPS brushless motor according to claim 2 or 3, characterized in that: the installation position is a groove, and the shape of the magnetic steel is matched with the shape of the groove.

5. The rotor assembly for an EPS brushless motor of claim 4, wherein: the notch of the groove is narrow at the upper part and wide at the lower part.

6. A rotor assembly for an EPS brushless motor as claimed in claim 2, wherein: the rotor comprises a first shaft section and a second shaft section, the diameter of the first shaft section is smaller than that of the second shaft section, and the mounting bracket is mounted on the first shaft section.

7. A rotor assembly for an EPS brushless motor as claimed in claim 1, wherein: the diameter of the communicating cavity is the same as the diameter of the bore.

8. A rotor assembly for an EPS brushless motor according to claim 1 or 7, characterized in that: the mounting seat is connected with a connecting part, a concave position is arranged in the connecting part, the diameter of the concave position is larger than that of the communication cavity, and the rotor is mounted on the concave position.

9. A rotor assembly for an EPS brushless motor as claimed in claim 8, wherein: the rotor is in interference fit with the concave position.

10. A rotor assembly for an EPS brushless motor as claimed in claim 2, wherein: the mounting bracket is made of injection molding materials.