CN220830379U

CN220830379U - Motor, driving system and braking system

Info

Publication number: CN220830379U
Application number: CN202322209712.1U
Authority: CN
Inventors: 杨向东
Original assignee: Vitesco Automotive Wuhu Co Ltd
Current assignee: Vitesco Automotive Wuhu Co Ltd
Priority date: 2023-08-16
Filing date: 2023-08-16
Publication date: 2024-04-23
Anticipated expiration: 2033-08-16

Abstract

The utility model relates to a motor, a driving system and a braking system, wherein the motor comprises: a housing having an accommodation space; a stator assembly located in the accommodation space and including a stator core and a winding; a rotor assembly located within the receiving space, the rotor assembly rotatably supported to the housing; the output component is fixedly connected with the rotor assembly; a stator assembly is radially inside the rotor assembly and an output member is radially inside the stator assembly. The utility model provides a driving system which is particularly suitable for a braking system, wherein a motor of the driving system adopts an outer rotor structure, and an output component is arranged on an axis, so that the torque provided by the same rotating speed is larger under the same size. The utility model is based on the basic conception of the outer rotor, integrates multiple functions on multiple parts, realizes one piece of multi-purpose, reduces the number of parts on the basis of realizing the required functions, reduces the volume and reduces the cost.

Description

Motor, driving system and braking system

Technical Field

The utility model relates to the technical field of motors, in particular to a motor, a driving system comprising the motor and a braking system comprising the motor.

Background

In a brake system of a vehicle, a brake pedal is provided. When it is desired to slow the vehicle, the driver may operate the wheel brakes in the brake system by depressing the brake pedal to apply braking forces to the wheels. With the development of braking technology, brake-by-wire systems have been developed in order to improve braking performance and driving comfort. In the brake-by-wire system, the driver does not directly operate the wheel brakes. When the driver depresses the brake pedal, a motion parameter of the brake pedal is collected, and the brake system determines the driver's braking intention based on the motion parameter of the brake pedal and applies brake pressure to the wheel brakes by means of an electrically driven pressure source. The electrically driven pressure source comprises an electric motor and a hydraulic cylinder, and the electric motor is connected with a piston of the hydraulic cylinder through a motion conversion device so as to convert the rotary motion output by the electric motor into the linear motion of the piston.

At present, the brake-by-wire is rapidly developed in China, wherein a driving unit is a brushless direct current motor, and the motor is arranged in a solid shaft inner rotor structure, which is unfavorable for arrangement of a ball screw, and under the condition of the same movement stroke of a main cylinder, the solid shaft motor scheme ensures that the axial length of the whole module is 40-50mm more, and the whole size is larger, so that the compact design is unfavorable. At the same time, the torque provided by the inner rotor motor is lower than that provided by the outer rotor motor under the condition of the same volume, and the low torque possibly cannot meet the requirement.

Disclosure of utility model

In order to solve one or more of the above technical problems at least to a certain extent, the present utility model proposes the following technical solutions.

An electric machine, comprising:

a housing having an accommodation space;

A stator assembly located within the receiving space and including a stator core and windings;

a rotor assembly located within the receiving space, the rotor assembly rotatably supported to the housing;

the output component is fixedly connected with the rotor assembly;

The stator assembly is radially inside the rotor assembly, and the output member is radially inside the stator assembly.

According to one aspect of the present utility model, the rotor assembly includes a rotor frame having an annular portion extending in an axial direction of the motor and provided with permanent magnets, and a first bottom portion perpendicular to the axial direction, on which a plurality of openings distributed in a circumferential direction are provided for cooperation with an eddy current sensor to detect a rotational speed of the rotor frame, and a plurality of permanent magnets provided on the rotor frame.

According to one aspect of the utility model, the rotor skeleton further comprises a second base axially spaced from the first base, the second base having structure provided thereon for connection with the output member.

According to one aspect of the utility model, the housing further comprises a magneto-resistive sensor housing for radially housing the magneto-resistive sensor between the housing and the rotor assembly.

The utility model also proposes a drive system comprising:

a motor according to the above; and

A hollow member in which the output member is accommodated, and the output member and the hollow member together form a motion conversion mechanism that converts rotational motion of the output member into linear motion of the hollow member.

According to one aspect of the utility model, the motor further comprises a stator support skeleton having a cylindrical portion extending in the axial direction, and the cylindrical portion is located radially between the stator assembly and the hollow member, and an anti-rotation portion for preventing rotation of the hollow member is provided on the cylindrical portion.

According to one aspect of the utility model, the anti-rotation part is a protrusion or a groove extending along the axial direction;

a groove or protrusion is provided on the hollow member that mates with the protrusion or groove.

According to one aspect of the present utility model, the stator support frame has an annular portion perpendicular to an axial direction, on which a structure for mounting a magnetoresistive sensor is provided.

The utility model also proposes a braking system comprising:

A drive system according to the above; and

And the hollow component is used as a piston of the hydraulic cylinder.

According to one aspect of the utility model, a double lip seal is provided at the end of the hollow member.

According to the above-mentioned aspects, the present utility model proposes a drive system particularly suitable for a braking system, in which the motor of the drive system adopts an outer rotor structure, and the output member is arranged on the axis, so that the torque provided at the same rotation speed is greater at the same size. In addition, the utility model integrates multiple functions on a plurality of parts based on the basic conception of the outer rotor, realizes one piece of multi-purpose, reduces the number of parts on the basis of realizing the required functions, reduces the volume and reduces the cost.

Other features and advantages of the present utility model will be described in the following detailed description of the utility model, taken in conjunction with the accompanying drawings.

Drawings

Exemplary embodiments of the present utility model are described with reference to the accompanying drawings, in which:

Fig. 1 shows an exploded view of the drive system of the present utility model.

Fig. 2 shows a cross-sectional view of the drive system of the present utility model.

Fig. 3 shows a perspective view of the drive system of the present utility model.

Fig. 4 (a) shows a cross-sectional view of the rotor frame of the motor of the present utility model.

Fig. 4 (b) shows a perspective view of a rotor frame of the motor of the present utility model.

Fig. 4 (c) shows a top view of the rotor frame of the motor of the present utility model.

Fig. 5 shows a cross-sectional view of the drive system of the utility model with a magneto-resistive sensor mounted.

Fig. 6 (a) shows a front cross-sectional view of the stator support frame of the motor of the present utility model.

Fig. 6 (b) shows a perspective view of a stator support frame of the motor of the present utility model.

Fig. 6 (c) shows a top view of the stator support frame of the motor of the present utility model.

Fig. 6 (d) shows a front view of the stator support frame of the motor of the present utility model.

Fig. 7 (a) shows a top cross-sectional view of the stator support frame of the present utility model.

Fig. 7 (b) shows a partial enlarged view of the stator support frame in fig. 7 (a).

Fig. 8 (a) shows a perspective view of the seal ring of the present utility model.

Fig. 8 (b) shows a cross-sectional view of the seal ring of the present utility model.

All the figures are schematic and not necessarily to scale, and they show only those parts which are necessary in order to elucidate the utility model, the other parts being omitted or merely mentioned. That is, the present utility model may include other components in addition to those shown in the drawings.

In the drawings, identical and/or functionally identical technical features are provided with the same or similar reference signs.

Detailed Description

Embodiments of the present utility model are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding and enabling description of the utility model to one skilled in the art. It will be apparent, however, to one skilled in the art that the present utility model may be practiced without some of these specific details. Furthermore, it should be understood that the utility model is not limited to specific described embodiments. Rather, any combination of the features and elements described below is contemplated to implement the utility model, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and should not be considered features or limitations of the claims except where explicitly set out in a claim.

Description of orientations such as "upper", "lower", "inner", "outer", "radial", "axial", etc. which may be used in the following description are for convenience of description only and are not intended to limit the inventive arrangements in any way unless explicitly stated. Furthermore, terms such as "first," "second," and the like, are used hereinafter to describe elements of the present utility model, and are merely used for distinguishing between the elements and not intended to limit the nature, sequence, order, or number of such elements.

Fig. 1 shows an exploded view of the drive system of the present utility model, fig. 2 shows a sectional view of the drive system of the present utility model, and fig. 3 shows a perspective view of the drive system of the present utility model. As can be seen in connection with fig. 1 to 3, the drive system of the present utility model mainly comprises two parts, a motor and a ball screw 6, respectively. Specifically, the motor includes a rotor assembly 2, a stator assembly 3, and the ball screw 6 includes a nut 61 and a screw 62 with balls interposed therebetween. Preferably, the motor is a brushless motor.

The motor is arranged in the housing 1, and the rotor assembly adopts a surface-mounted structure. Referring to fig. 1 and 2, the rotor assembly 2 includes a rotor frame 21, a plurality of permanent magnets provided inside the rotor frame 21 in a surface-mount manner, and a metal ring 23 for further fixing the permanent magnets. The metal ring 23 is made of a non-magnetic metal material. The rotor frame 21 is rotatably supported in the housing 1 by a bearing 10. Preferably, the bearing 10 employs four-point contact ball bearings in order to achieve both axial and radial support of the rotor skeleton 21. The structure of the rotor frame can be further understood in conjunction with fig. 4 (a), 4 (b) and 4 (c). In particular, the rotor skeleton 21 has an annular body, thereby defining an axial direction, which is also the axial direction of the motor. A plurality of axially extending protruding structures 211 are provided on the inner wall of the annular body, and a mounting space for arranging the permanent magnets is formed between every two adjacent protruding structures.

The stator assembly 3 includes a stator core, stator windings, and insulating bobbins on both sides of the stator core. The structure of the stator assembly 3 is not limited to the illustrated structure, and a suitable structure known in the art may be employed.

To drive the ball screw 6 to operate, as can be seen in fig. 2, one end of the screw 62 is fixedly connected to the end of the rotor frame 21 so as to be rotatable together with the rotor frame 21. As a specific embodiment, see fig. 4 (c), the rotor frame has a bottom perpendicular to the axial direction of the motor, on which at least one connection 215 is provided for connection with a corresponding connection of the end of the screw 62. The connection 215 may take the form of a hole, and a plurality of holes may be provided, for example, 5 holes in fig. 4 (c). Accordingly, the screw 62 is provided with a protrusion.

Further, in order to prevent the screw 62 from moving axially, the bottom is provided with a two-stage form. Referring to fig. 4 (a) and 4 (c), a first bottom 213 extends radially inward from the annular body, a second bottom extends axially from the first bottom, and a connecting portion 215 is provided on the second bottom. Accordingly, the portion connecting the first bottom portion and the second bottom portion is referred to as an axial connecting portion. A groove 214 is provided in the axial connection, in which groove the stop 9 is provided. The stop 9 may take the form of a C-ring. Accordingly, corresponding portions may be provided on the lead screw 62 to be engaged with the stopper 9.

As can be seen from fig. 1 and 2, the motor of the present utility model adopts an outer rotor structure. That is, the stator assembly 3 is radially accommodated inside the rotor assembly 2. The present utility model employs such an outer rotor motor, compared to known inner rotor motors in braking systems, which can provide a greater torque at the same rotational speed due to the larger radius of the rotor. The adoption of an external rotor motor in a braking system is a basic inventive concept of the utility model.

The present utility model also proposes the following improvements on this basic inventive concept.

In order to measure an operating parameter of the motor, such as the rotational speed, a sensor is provided on the motor. The known solutions are provided with a magneto-resistive sensor or an eddy current sensor. The principle of operation of a magnetoresistive sensor is that the change in the magnetic field strength in a rotating rotor is measured, whereby the rotational speed of the rotor is measured. The working principle of the eddy current sensor is to accurately measure the relative position of the measured body (necessarily a metal conductor) and the end face of the probe by the principle of the eddy current effect, and the eddy current sensor is characterized by good long-term working reliability, high sensitivity, strong anti-interference capability, non-contact measurement, high response speed and no influence of oil-water and other mediums. However, in the conventional inner rotor motor, if a magneto-resistive sensor is to be used, due to space limitation, the magnetic steel of the motor rotor itself cannot be used as the signal magnetic steel, and an additional signal magnetic ring must be added; if an eddy current sensor is to be used, a separate part must be mounted on the rotating part, which requires a larger installation space, which results in a larger motor volume and higher costs. An improvement of the utility model is that on the basis of adopting the form of an external rotor motor, a structure which is preset by the form of an external rotor and is used for the two sensors to work is further conceived. Of course, those skilled in the art will recognize that in actual use, a sensor may be provided. The present utility model enables the installation of both sensors to be satisfied simultaneously without any adjustment by providing two corresponding structures.

In addition, the utility model also directly utilizes the rotor skeleton to form the element matched with the vortex sensor, thereby realizing one piece with multiple purposes, without additionally arranging corresponding matched elements, reducing the number of parts, lowering the cost and reducing the volume.

Specifically, referring to fig. 4 (b) and 4 (c), a plurality of openings 212 are provided on the first bottom 213 of the rotor frame 21. In fig. 2, a form in which an eddy current sensor 41 is mounted is shown. The eddy current sensor itself is annular, having a certain overlap in the radial direction with the first bottom 213 of the rotor frame 21. Thus, when the rotor frame 21 rotates, the eddy current sensor 41 can sense the rotation speed due to the metal portion and the opening 212 thereon. Because the utility model adopts the form of the outer rotor, the radial dimension of the rotor can ensure the normal operation of the vortex sensor 41 relatively, and the opening 212 is arranged so that the strength of the vortex sensor cannot meet the requirement. The number, size, and location of the openings 212 may be set as desired. In the manner of fig. 4 (c), the openings 212 take the form of 5 openings uniformly distributed in the circumferential direction. The eddy current sensor 41 may be mounted on a fixed member such as a stator by a fastener such as a screw.

Fig. 5 shows a cross-sectional view of the drive system of the utility model with a magneto-resistive sensor mounted. Referring to fig. 1, 3 and 5, the magnetoresistive sensor 42 is radially accommodated between the housing 1 and the rotor frame 21. Therefore, the magnetic steel of the motor rotor is used as the signal magnetic steel, and when the rotor 21 rotates, the magnetic resistance sensor 42 can sense the magnetic field change of the rotor so as to measure the rotating speed of the rotor, and no signal magnetic ring is required to be additionally arranged.

In view of the above, the present utility model makes it possible to provide a housing space in which a magnetoresistive sensor is disposed and a structure that is adapted to an eddy current sensor by using the structural form of the outer rotor on the basis of the outer rotor without providing a separate adaptation structure for each sensor.

Fig. 6 (a) shows a front cross-sectional view of a stator support frame of the motor of the present utility model, fig. 6 (b) shows a perspective view of the stator support frame of the motor of the present utility model, fig. 6 (c) shows a top view of the stator support frame of the motor of the present utility model, and fig. 6 (d) shows a front view of the stator support frame of the motor of the present utility model. With further reference to fig. 1 and 2, it can be seen that the stator support armature is used to provide support to the stator. Specifically, the stator support frame 5 has an annular portion 51 perpendicular to the axial direction and a cylindrical portion 52 extending along the axis. On the annular portion 51, a mounting portion 54 for mounting the magnetoresistive sensor may be provided. The mounting portion 54 may take the form of a hole. The cylindrical portion 52 is provided with an anti-rotation portion 53 for preventing rotation of the nut 61 during linear movement.

Since the nut 61 itself functions as a piston, when the screw 62 rotates together with the outer rotor, the rotational motion of the screw 62 is converted into the linear motion of the nut 61 by the power transmission action of the balls. In order to ensure the accuracy of the movement, that is, to make the screw 61 move only straight and not rotate, the rotation of the screw 61 needs to be prevented. For this purpose, referring to fig. 1, a groove 611 extending in the axial direction is provided on the outer wall of the nut, and the groove 611 is engaged with the rotation preventing portion 53 on the cylindrical portion 52 of the stator support frame 5, thereby preventing the nut 61 from rotating, so that the nut 61 can move only in the axial direction. Fig. 7 (a) shows a top cross-sectional view of the stator support frame of the present utility model, and fig. 7 (b) shows a partially enlarged view of the stator support frame within the circle indicated by the arrow in fig. 7 (a). The engagement structure of the rotation preventing portion 53 with the nut 61 can be seen more clearly from fig. 7 (a) and 7 (b).

As a specific embodiment, the stator support frame 5 is deep-drawn supported by a plate. Specifically, after deep drawing one plate material, the annular portion 51 and the cylindrical portion 52 can be obtained. Subsequently, the cylindrical portion 52 is subjected to side punching, whereby the rotation preventing portion 53 is obtained.

Preferably, the rotation preventing parts 53 are provided in two and are oppositely disposed on the same diameter.

In the conventional scheme, in order to prevent the screw from rotating during the linear motion, two or three parts are required to be additionally and separately arranged between the screw and the corresponding part, so that the structure is more complicated, and the added parts occupy the internal space of the motor, thereby being unfavorable for the compact design of the motor besides high cost. Through the arrangement, the anti-rotation part is integrated on the stator supporting framework, so that the stator supporting framework also has an anti-rotation function, one piece of multi-purpose is realized, no additional parts are needed, the structure is more compact while the functional requirement is met, and the cost is lower.

Fig. 8 (a) shows a perspective view of the seal ring of the present utility model, and fig. 8 (b) shows a cross-sectional view of the seal ring of the present utility model. The drive system of the present utility model may be combined with hydraulic cylinders or the like to jointly form a brake system. As mentioned before, since the nut 61 itself also acts as a piston of the brake system, it is necessary to ensure a seal between it and the brake cylinder. For this purpose, a seal 7 is provided on the outer wall of the nut 61. Further, the seal 7 is a double lip seal having a first lip 71 and a second lip 72 with a groove therebetween. By means of the double lip seal, a good dynamic seal between the piston and the cylinder wall can be ensured.

In addition, in order to match the motor and the ball screw of the utility model with other parts, the utility model also provides a sealing ring 11 and an electric connector 8. The electrical connector is used to provide current and control for the motor and the sealing ring 11 is used to seal against other parts of the brake system.

While the present utility model has been described with respect to the above exemplary embodiments, it will be apparent to those skilled in the art that various other embodiments can be devised by modifying the disclosed embodiments without departing from the spirit and scope of the utility model. Such embodiments should be understood to fall within the scope of the utility model as determined based on the claims and any equivalents thereof.

Claims

1. An electric machine, comprising:

a housing having an accommodation space;

the output component is fixedly connected with the rotor assembly;

It is characterized in that the method comprises the steps of,

2. An electric machine according to claim 1, characterized in that,

The rotor assembly comprises a rotor framework and a plurality of permanent magnets arranged on the rotor framework, the rotor framework is provided with an annular part which extends along the axial direction of the motor and is provided with the permanent magnets, and a first bottom which is perpendicular to the axial direction, a plurality of openings which are distributed in the circumferential direction are arranged on the first bottom, and the openings are used for being matched with an eddy current sensor to detect the rotating speed of the rotor framework.

3. An electric machine according to claim 2, characterized in that,

The rotor skeleton further includes a second base axially spaced from the first base, with structure provided thereon for connection with the output member.

4. An electric machine according to any one of claims 1-3, characterized in that,

A magnetoresistive sensor housing is also included for radially housing a magnetoresistive sensor between the housing and the rotor assembly.

5. A drive system, comprising:

The motor according to any one of claims 1 to 4; and

6. The drive system of claim 5, comprising:

the motor further comprises a stator support skeleton which is provided with a cylindrical part extending along the axial direction, the cylindrical part is positioned between the stator assembly and the hollow component in the radial direction, and an anti-rotation part for preventing the hollow component from rotating is arranged on the cylindrical part.

7. The drive system of claim 6, comprising:

the anti-rotation part is a bulge or a groove extending along the axial direction;

8. The drive system of claim 6 or 7, wherein,

The stator support frame has an annular portion perpendicular to an axial direction on which a structure for mounting a magnetoresistive sensor is provided.

9. A braking system, comprising:

The drive system according to any one of claims 5-8; and

And the hollow component is used as a piston of the hydraulic cylinder.

10. A brake system according to claim 9 wherein,

A double lip seal is provided at the end of the hollow member.