CN218986605U

CN218986605U - Driving assembly, electric control pressure unit, braking system and vehicle

Info

Publication number: CN218986605U
Application number: CN202223325182.9U
Authority: CN
Inventors: 贾光欣; 王晓歌; 尹香帅
Original assignee: Qingzhi Automobile Technology Suzhou Co ltd
Current assignee: Qingzhi Automobile Technology Suzhou Co ltd
Priority date: 2022-12-12
Filing date: 2022-12-12
Publication date: 2023-05-09
Anticipated expiration: 2032-12-12

Abstract

The utility model provides a driving assembly, an electric control pressure unit, a braking system and a vehicle, wherein the driving assembly comprises: the motor assembly comprises a motor stator, a motor rotor positioned in the motor stator and a bearing arranged between the end part of the motor stator and the end part of the motor rotor, and the outer side wall of the motor rotor is provided with a step surface for stopping the bearing; the ball screw assembly comprises a screw rod, a nut and a translational anti-rotation piece, wherein the screw rod, the nut and the translational anti-rotation piece are matched with each other, and the translational anti-rotation piece is used for limiting the rotation of the nut; the locking nut is in threaded connection with the screw rod protruding out of the motor rotor, the end face of the motor stator is provided with an avoidance hole for avoiding the locking nut and the screw rod, the bearing is clamped between the step face and the locking nut, and the locking nut is provided with a limiting concave part. By applying the technical scheme of the embodiment, the problem of poor assembly manufacturability when the screw rod and the motor component of the electric control pressure unit are axially fixed in the prior art can be effectively solved.

Description

Driving assembly, electric control pressure unit, braking system and vehicle

Technical Field

The utility model relates to the field of braking devices of vehicles, in particular to a driving assembly, an electric control pressure unit, a braking system and a vehicle.

Background

In the related art, intelligent driving and intelligent auxiliary driving are trends of automobile development, and a brake-by-wire technology is an important part. The motor hydraulic braking system for realizing the brake-by-wire in the passenger car is an intelligent integrated braking system based on the brake-by-wire technology, and adopts an electric control pressure unit, wherein the electric control pressure unit comprises a motor and a ball screw mechanism, converts rotary motion into piston linear motion, completes the establishment of hydraulic pressure, and realizes the brake-by-wire through a sensor and signal processing.

However, the screw of the electric control pressure unit in the related art is poor in assembly manufacturability when mounted with the motor rotor.

Disclosure of Invention

The utility model mainly aims to provide a driving assembly, an electric control pressure unit, a braking system and a vehicle, so as to solve the problem of poor assembly manufacturability when a screw rod of the electric control pressure unit and a motor assembly are axially fixed in the prior art.

In order to achieve the above object, according to one aspect of the present utility model, there is provided a driving assembly of an electronically controlled pressure unit, comprising: the motor assembly comprises a motor stator, a motor rotor positioned in the motor stator and a bearing arranged between the end part of the motor stator and the end part of the motor rotor, and the outer side wall of the motor rotor is provided with a step surface for stopping the bearing; the ball screw assembly comprises a screw rod, a nut and a translational anti-rotation piece, wherein the screw rod, the nut and the translational anti-rotation piece are matched with each other, and the translational anti-rotation piece is used for limiting the rotation of the nut; the locking nut is in threaded connection with the screw rod protruding out of the motor rotor, the end face of the motor stator is provided with an avoidance hole for avoiding the locking nut and the screw rod, the bearing is clamped between the step face and the locking nut, and the locking nut is provided with a limiting concave part.

In one embodiment, a notch penetrating through two end faces of the lock nut is arranged on the side wall of the lock nut, and the notch forms a limit concave part.

In one embodiment, the limit concave parts are two opposite to each other arranged at two sides of the lock nut.

In one embodiment, the screw end of the screw protruding from the motor rotor comprises a threaded connection section connected with the lock nut and a screwing section located at the threaded connection section and far away from the motor rotor, wherein the screwing section is provided with a matching structure for matching screwing.

In one embodiment, the screwing section is of an external hexagonal structure.

In one embodiment, the threaded spindle comprises an anti-rotation section with a side wall having a milled flat, and the motor rotor has a mating bore section that is adapted to the shape of the anti-rotation section.

In one embodiment, the anti-rotation section and the matching hole section are in unilateral 0.05mm clearance fit.

According to another aspect of the present utility model, there is provided an electronically controlled pressure unit comprising: the driving assembly is the driving assembly of the electric control pressure unit.

According to yet another aspect of the present utility model, there is provided a brake system including: the electric control pressure unit is the electric control pressure unit.

According to a final aspect of the present utility model, there is provided a vehicle comprising: and the braking system is the braking system.

By applying the technical scheme of the utility model, when the motor rotor is connected with the screw rod, the limiting tool is matched with the limiting concave part on the locking nut to limit the rotation of the locking nut. Then through the cooperation of rotating tool and lead screw, rotatory rotating tool lets the lead screw follow the rotating tool rotatory backing, lock nut chucking bearing to this axial fixation who realizes lead screw and motor assembly. The structure has good assembly manufacturability, and the axial fixing efficiency of the screw rod and the motor assembly is high. The problem of among the prior art automatically controlled pressure unit's lead screw and motor assembly when carrying out axial fixation, the assembly manufacturability is poor is solved.

In addition to the objects, features and advantages described above, the present utility model has other objects, features and advantages. The present utility model will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 shows a schematic cross-sectional view of an embodiment of an electronically controlled pressure unit according to the utility model;

FIG. 2 is a schematic perspective view of the drive assembly of the electronically controlled pressure cell of FIG. 1 with the motor stator removed; and

fig. 3 shows a schematic view of a part of the structure of the motor assembly of the electrically controlled pressure unit of fig. 1 in cooperation with a screw.

Wherein the above figures include the following reference numerals:

10. a motor assembly; 11. a motor stator; 111. avoidance holes; 12. a motor rotor; 121. a step surface; 13. a bearing; 20. a ball screw assembly; 21. a screw rod; 211. a threaded connection section; 212. a screwing section; 213. an anti-rotation section; 22. a nut; 23. a translational rotation preventing member; 30. a lock nut; 31. and (5) a notch.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are, for example, capable of operation in other environments. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

As shown in fig. 1 to 3, the driving assembly of the electronically controlled pressure unit of the present embodiment includes: a motor assembly 10, a ball screw assembly 20 and a lock nut 30. The motor assembly 10 includes a motor stator 11, a motor rotor 12 disposed in the motor stator 11, and a bearing 13 disposed between an end of the motor stator 11 and an end of the motor rotor 12, wherein an outer sidewall of the motor rotor 12 has a step surface 121 for stopping the bearing 13. The ball screw assembly 20 includes a screw 21, a nut 22, and a translational rotation preventing member 23 for restricting the rotation of the nut 22, which are engaged with each other, and the ball screw assembly 20 is disposed through the motor rotor 12. The lock nut 30 is in threaded connection with the end part of the screw rod 21 protruding out of the motor rotor 12, the end surface of the motor stator 11 is provided with an avoidance hole 111 for avoiding the lock nut 30 and the screw rod 21, the bearing 13 is clamped between the step surface 121 and the lock nut 30, and the lock nut 30 is provided with a limit concave part.

By applying the technical scheme of the embodiment, when the motor rotor 12 is connected with the screw rod 21, the locking nut 30 is limited to rotate by matching a limiting tool with a limiting concave part on the locking nut 30. Then, the rotating tool is matched with the screw rod 21, the rotating tool is rotated, the screw rod 21 is rotated and retreated along with the rotating tool, and the locking nut 30 clamps the bearing 13, so that the axial fixation of the screw rod 21 and the motor assembly 10 is realized. The structure has good assembly manufacturability, and the axial fixing efficiency of the screw rod 21 and the motor assembly 10 is high. The problem of among the prior art automatically controlled pressure unit's lead screw and motor assembly when carrying out axial fixation, the assembly manufacturability is poor is solved.

As shown in fig. 1 to 3, in the present embodiment, notches 31 penetrating both end surfaces of the lock nut 30 are provided on the side wall of the lock nut 30, and the notches 31 form limit recesses. Specifically, when the motor rotor 12 is connected to the screw 21, the limiting tool first extends into the notch 31 to limit the lock nut 30 from rotating under an external force, and then is engaged with the screw 21 by the rotating tool. The limiting structure is simple and has good assembly manufacturability. Of course, in other embodiments not shown in the figures, the limit recess may also be a limit hole with a profiled cross section.

As shown in fig. 1 to 3, in the present embodiment, the limit recesses are two opposite sides of the lock nut 30. Specifically, when the motor rotor 12 is connected to the screw 21, the jig first extends into two opposite limit recesses (i.e., notches), and the lock nut 30 is limited to rotate under an external force, and then is engaged with the screw 21 by a rotating tool. The above structure enables the lock nut 30 to be matched with the existing limiting tool in the prior art, and a separate limiting tool does not need to be manufactured, so that the assembly cost is reduced.

As shown in fig. 1 to 3, in the present embodiment, the screw end of the screw 21 protruding from the motor rotor 12 includes a screw connection section 211 connected with the lock nut 30 and a screwing section 212 located at the screw connection section 211 away from the motor rotor 12, the screwing section 212 having a mating structure for mating screwing. Specifically, after the rotation of the lock nut 30 is restricted, the screw 21 is more easily rotated by the rotation tool engaged with the exposed screwing section 212, thereby improving the efficiency of the axial fixation of the screw 21 and the motor assembly 10.

As shown in fig. 1 to 3, in the present embodiment, the screwing section 212 has an outer hexagonal structure. Specifically, after the rotation of the lock nut 30 is restricted, the torque wrench is rotated by the cooperation of the torque wrench and the outer hexagonal structure, so that the screw 21 is rotated back along with the torque wrench. The above structure enables the screw 21 to be engaged with a rotating tool existing in the prior art, and a separate rotating tool does not have to be manufactured, thereby reducing assembly costs. Of course, in other embodiments not shown in the figures, the screwing section 212 may also be provided with internal hexagonal holes.

In this embodiment, if the screw rod 21 and the lock nut 30 are loosened, the motor assembly 10 and the screw rod 21 are axially locked and fail, so that the motor assembly 10 cannot drive the screw rod 21 to rotate, the piston cannot move linearly to complete the establishment of hydraulic pressure, and finally, the line control cannot be realized. In order to avoid the above problem, as shown in fig. 1 and 2, in the present embodiment, the screw 21 includes an anti-rotation section 213 having a side wall with a milled flat surface, and the motor rotor 12 has a mating hole section that is adapted to the shape of the anti-rotation section 213. Therefore, even if the locking of the screw rod 21 and the locking nut 30 fails, the screw rod 21 can be driven to drive through the anti-rotation section 213 with the milling flat surface, so that the piston moves linearly to complete hydraulic pressure building, and finally, the reliability of a driving assembly of the electric control pressure unit is ensured. Of course, in other embodiments not shown in the figures, the anti-rotation section may not have a milled flat, but a flat key connection is used between the anti-rotation section and the mating hole section.

In this embodiment, the anti-rotation section 213 is in single-sided 0.05mm clearance fit with the mating hole section.

The present application further provides an electrically controlled pressure unit, as shown in fig. 1, where an embodiment of the electrically controlled pressure unit according to the present application includes: the driving assembly is the driving assembly of the electric control pressure unit. The driving assembly has the advantage of good assembly manufacturability, so the electric control pressure unit with the driving assembly also has the advantage.

The present application also provides a brake system, an embodiment of which according to the present application comprises: and the electric control pressure unit is the electric control pressure unit. The brake system with the electrically controlled pressure unit has the advantages of good assembly manufacturability.

The present application also provides a vehicle, an embodiment of the vehicle according to the present application comprising: and the braking system is the braking system. The brake system has the advantage of good assembly manufacturability, so that the vehicle with the brake system also has the advantage.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways and the spatially relative descriptions used herein are construed accordingly.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A drive assembly for an electronically controlled pressure cell, comprising:

a motor assembly (10) comprising a motor stator (11), a motor rotor (12) positioned in the motor stator (11), and a bearing (13) arranged between the end of the motor stator (11) and the end of the motor rotor (12), wherein the outer side wall of the motor rotor (12) is provided with a step surface (121) for stopping the bearing (13);

the ball screw assembly (20) comprises a screw (21), a nut (22) and a translational anti-rotation piece (23) which are matched with each other and limit the rotation of the nut (22), and the ball screw assembly (20) is arranged on the motor rotor (12) in a penetrating way;

lock nut (30), with the protrusion of lead screw (21) in screw tip threaded connection of motor rotor (12), the terminal surface of motor stator (11) have dodge lock nut (30) with dodge hole (111) of lead screw (21), bearing (13) press from both sides tightly in step face (121) with lock nut (30) between, be provided with spacing concave part on lock nut (30).

2. The drive assembly of an electrically controlled pressure unit according to claim 1, characterized in that a notch (31) is provided in the side wall of the lock nut (30) penetrating both end faces of the lock nut (30), the notch (31) forming the limit recess.

3. The drive assembly of an electrically controlled pressure unit according to claim 1, wherein the limit recesses are two oppositely arranged on both sides of the lock nut (30).

4. The drive assembly of an electrically controlled pressure unit according to claim 1, characterized in that the screw end of the screw (21) protruding from the motor rotor (12) comprises a threaded connection section (211) connected with the lock nut (30) and a screwing section (212) located at the threaded connection section (211) remote from the motor rotor (12), the screwing section (212) having a mating structure for mating screwing.

5. The drive assembly of an electrically controlled pressure unit according to claim 4, wherein the screwing section (212) is of hexagonal external structure.

6. The drive assembly of an electrically controlled pressure unit according to claim 1, characterized in that the screw (21) comprises an anti-rotation section (213) with a milled flat side wall, the motor rotor (12) having a mating hole section adapted to the shape of the anti-rotation section (213).

7. The drive assembly of an electrically controlled pressure unit according to claim 6, wherein the anti-rotation section (213) is a single sided 0.05mm clearance fit with the mating bore section.

8. An electronically controlled pressure cell comprising: a drive assembly, characterized in that the drive assembly is a drive assembly of an electrically controlled pressure unit according to any one of claims 1 to 7.

9. A braking system, comprising: an electrically controlled pressure unit, characterized in that it is an electrically controlled pressure unit according to claim 8.

10. A vehicle, comprising: a brake system, characterized in that the brake system is a brake system according to claim 9.