CN217111257U - Fixing structure of rotor, induction sensor and electric power steering system - Google Patents

Abstract

The utility model provides a fixed knot of rotor constructs, inductive pick-up and electronic power assisted steering system. The fixing structure of the rotor comprises a first rotor, a limiting piece and a shell. The first rotor comprises a first sleeve part and a first annular wall, and a first protruding part is arranged at one end of the first annular wall; the limiting piece is fixedly connected to the first sleeve part and/or the first annular wall, and a first end face of the limiting piece is attached to the other end of the first annular wall and protrudes out of the first annular wall; the casing include with the coaxial second annular wall of first annular wall, second annular wall orientation one side of first annular wall is provided with the second bulge, the second bulge is spacing in between first bulge, first annular wall and the locating part, first rotor with the casing is rotationally fixed connection. After the technical scheme is adopted, the vibration and the noise generated when the first rotor rotates can be obviously reduced.

Description

Fixing structure of rotor, induction sensor and electric power steering system

Technical Field

The utility model relates to a sensor technical field especially relates to fixed knot of rotor constructs, inductive transducer and electric power assisted steering system.

Background

The torque sensor generally includes a housing and a rotor, the rotor is fixedly connected to a shaft and rotatably and fixedly connected to the housing, a PCB having a sensing module is disposed on the housing, and the sensing module obtains torque information by sensing a rotation condition of the rotor.

Fig. 1 is a schematic structural diagram of a rotor 10 and a housing 20 in the prior art, wherein the rotor 10 is provided with four elastic walls 11 at intervals along a circumferential direction, and the elastic walls 11 are provided with protrusions; the housing 20 is provided with an annular wall 21, the annular wall 21 is provided with a groove portion matching with the protrusion portion along the circumferential direction, and the rotor 10 and the housing 20 are rotatably and fixedly connected by clamping the protrusion portion of the elastic wall 11 into the groove portion of the annular wall 21.

In the prior art, the friction surfaces of the rotor 10 and the housing 20 are multiple and separated, and the rotor vibrates greatly when rotating, so that the generated noise is large.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technical defect, the utility model aims to provide a rotor fixed knot who vibrates and noise when can reduce the rotor and rotate constructs, has this rotor fixed knot construct's inductive transducer and has this sensor's electron power assisted steering system.

The utility model discloses a fixed knot of rotor constructs, it includes:

a first rotor (100), wherein the first rotor (100) comprises a first sleeve part (110) and a first annular wall (120), the first sleeve part (110) is used for being fixedly sleeved on a first shaft, the first annular wall (120) is fixedly arranged on one side, away from the first shaft, of the first sleeve part (110), a first protruding part (121) is arranged at a first end of the first annular wall (120) in the axial direction, and the first protruding part (121) protrudes towards the direction away from the first sleeve part (110);

the limiting piece (200) is sleeved on one side, away from the first shaft, of the first sleeve part (110), the limiting piece (200) is fixedly connected to the first sleeve part (110) and/or the first annular wall (120), a first end face of the limiting piece (200) is attached to a second end, in the axial direction, of the first annular wall (120), and the limiting piece (200) protrudes out of the first annular wall (120) in the radial direction of the first annular wall (120);

the shell (300) comprises a second annular wall (310) coaxial with the first annular wall (120), a second bulge (311) is arranged on one side, facing the first annular wall (120), of the second annular wall (310) along the circumferential direction, the side, facing the first annular wall (120), of the second bulge (311) abuts against one side, far away from the first sleeve part (110), of the first annular wall (120), the first end, in the axial direction, of the second bulge (311) abuts against the first bulge (121), and the second end, in the axial direction, of the second bulge (311) abuts against the first end face of the limiting piece (200).

Preferably, the first end face of the stopper (200) and the second end of the first annular wall (120) are connected by laser welding.

The utility model also discloses an induction sensor, which comprises the fixing structure, wherein a first induction part (1211) is arranged on the first rotor (100);

the inductive sensor further comprises:

the second rotor (400), the second rotor (400) includes the second sleeve section (410) and fixes the second reaction piece (420) on the said second sleeve section (410), the said second sleeve section (410) is used for covering and setting up on a second axle that connects with said first axle through the torsion bar;

the PCB (500), the PCB (500) is fixedly connected with the shell (300), and the PCB (500) is used for sensing the rotation of the first sensing element (1211) and the second sensing element (420) and outputting a torque signal.

Preferably, the PCB (500) is configured to sense rotation of the first sensing member (1211) and the second sensing member (420) through electromagnetic induction, resistance strain gauge sensing, inductive sensing, capacitive sensing, piezoelectric sensing, photoelectric sensing, or hall sensing.

Preferably, the inductive sensor further comprises a first cover plate (600);

the first cover plate (600) is fixedly connected with the shell (300), and the PCB (500) is clamped and fixed between the first cover plate (600) and the shell (300).

Preferably, the limiting member (200) is a first gear;

the inductive sensor further comprises a second gear (800) and a second cover plate (900);

the second gear (800) comprises a second gear body (810) meshed with the first gear, a third boss (820) in a truncated cone shape positioned on one end face of the second gear body (810), and a magnet (830) fixedly connected to the third boss (820);

the shell (300) is provided with a first accommodating part (320) matched with the third protruding part (820) and the magnet (830) in shape, and the third protruding part (820) and the magnet (830) are installed in the first accommodating part (320);

the second cover plate (900) is fixedly connected with the shell (300), and the second gear (800) is clamped and fixed between the cover plate and the shell (300);

the PCB (500) is used for sensing the rotation condition of the magnet (830) and acquiring the rotation angle of the first gear.

Preferably, the first gear comprises a first gear body (210) and a planar connecting portion (220), a first end face of the planar connecting portion (220) is abutted to a second end of the first annular wall (120) in the axial direction of the first annular wall, the planar connecting portion (220) protrudes out of the first annular wall (120) in the radial direction of the first annular wall (120), and the first gear body (210) is fixedly arranged on the second end face of the planar connecting portion (220).

The utility model also provides an electric power steering system, it includes:

a steering wheel;

an input shaft connected to the steering wheel;

an output shaft connected with the input shaft through a torsion bar;

as mentioned above, the first rotor (100) of the inductive sensor is fixedly sleeved on the input shaft, and the second rotor (400) of the inductive sensor is fixedly sleeved on the output shaft;

an ECU control unit connected with the PCB (500) of the induction sensor;

and the motor is connected with the ECU control unit.

After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:

1. according to the fixing structure of the rotor, the friction surface is an integral body, and vibration and noise are small when the rotor rotates;

2. the utility model provides an inductive sensor is integrated in same module with the detection of moment of torsion and angle, through changing different PCBs, can obtain the inductive sensor of two kinds of differences of torque sensor and moment of torsion and angle sensor, and the product structure does not need any change, does not influence customer interface design, and commonality and interchangeability are high.

Drawings

FIG. 1 is a schematic structural diagram of a housing and a rotor in the prior art;

fig. 2 is an exploded view of an inductive sensor in an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of the inductive sensor of fig. 2.

Reference numerals:

10-rotor, 11-elastic wall, 20-housing, 21-annular wall, 100-rotor, 110-first sleeve part, 120-first annular wall, 121-first protrusion, 1211-first inductive element, 200-first gear, 210-first gear body, 220-planar connection, 300-housing, 310-second annular wall, 311-second protrusion, 400-second rotor, 410-second sleeve part, 420-second inductive element, 500-PCB, 600-first cover plate, 700-output interface, 800-second gear, 810-second gear body, 820-third protrusion, 830-magnet, 900-second cover plate.

Detailed Description

The advantages of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

In the following description, suffixes such as "module", "part", or "unit" used to indicate elements are used only for the convenience of description of the present invention, and have no specific meaning in itself. Thus, "module" and "component" may be used in a mixture.

Referring to fig. 2 and 3, the induction sensor in an embodiment of the present invention includes a first rotor 100, a first gear 200, a housing 300, a second rotor 400, a PCB500, a first cover 600, an output interface 700, a second gear 800, and a second cover 900.

The first rotor 100 includes a first sleeve portion 110 and a first annular wall 120, the first sleeve portion 110 is configured to be fixedly sleeved on a first shaft, the first annular wall 120 is fixedly disposed on a side of the first sleeve portion 110 away from the first shaft, a first protruding portion 121 is disposed at a first end of the first annular wall 120 in an axial direction (the axial direction is an up-down direction in fig. 3), the first protruding portion 121 is disposed along a circumferential direction of the first annular wall 120, and the first protruding portion 121 protrudes in a direction away from the first sleeve portion 110. The first protrusion 121 is provided with a first sensing member 1211.

The first gear 200 is sleeved on a side of the first sleeve portion 110 away from the first shaft, a first end surface of the first gear 200 is attached to a second end of the first annular wall 120 in an axial direction thereof, in this embodiment, the first end surface of the first gear 200 (a lower end surface of the first gear 200 in fig. 3) is connected to a second end of the first annular wall 120 in the axial direction thereof (an upper end of the first annular wall 120 in fig. 3) by laser welding, and the first gear 200 protrudes from the first annular wall 120 in a radial direction of the first annular wall 120 (the radial direction is a left-right direction in fig. 3), so that the first protrusion 121, the first annular wall 120 and the first gear 200 form a groove structure together. In this embodiment, the first gear includes a first gear body 210 and a planar connecting portion 220, a first end face of the planar connecting portion 220 is attached to a second end of the first annular wall 120 in the axial direction of the first annular wall, the planar connecting portion 220 protrudes from the first annular wall (120) in the radial direction of the first annular wall 120, and the first gear body 210 is fixedly disposed on the second end face of the planar connecting portion 220. Thus, the first gear body 210 can be sized more flexibly, and its addendum circle diameter need not exceed the diameter of the first annular wall 120, as long as the diameter of the planar connection portion 220 exceeds the diameter of the first annular wall 120.

The housing 300 comprises a second annular wall 310 coaxial with the first annular wall 120, the middle part of the second annular wall is a hollow area, one side of the second annular wall 310 facing the first annular wall 120 is provided with a second bulge 311 along the circumferential direction thereof, the side of the second protrusion 311 facing the first annular wall 120 abuts the side of the first annular wall 120 facing away from the first sleeve portion 110, a first end of the second projecting portion 311 in the axial direction thereof (a lower end of the second projecting portion 311 in fig. 3) abuts against the first projecting portion 121, a second end of the second protrusion 311 in the axial direction (an upper end of the second protrusion 311 in fig. 3) abuts against the first end surface of the first gear 200, that is, the second protrusion 311 is clamped into a groove structure formed by the first protrusion 121, the first annular wall 120 and the first gear 200, and the first rotor 100 is in a rotationally fixed connection with the housing 300. Specifically, when the first rotor 100, the first gear 200 and the housing 300 are installed, the first rotor 100 is inserted into the hollow area in the second annular wall 310 of the housing 300, the side of the second protrusion 311 facing the first annular wall 120 is abutted against the side of the first annular wall 120 away from the first sleeve part 110, the lower end of the second protrusion 311 is abutted against the upper end of the first protrusion 121, the first gear 200 is sleeved on the upper end of the first annular wall 120, the lower end surface of the first gear 200 is connected to the upper end of the first annular wall 120 by laser welding, the first rotor 100 (and the first gear 200) is rotatably fixed relative to the housing 300, and at this time, the displacement of the first rotor 100 relative to the housing 300 in the radial direction is limited by the side of the second protrusion 311 facing the first annular wall 120, the displacement of the first rotor 100 in the axial direction relative to the housing 300 is limited by the cooperation of the second projection 311 with the first projection 121 and the first gear 200, and the first rotor 100 can only rotate relative to the housing 300. In the present embodiment, the second protrusion 311 is approximately attached to the first annular wall 120 with a slight gap, and the second protrusion 311 is also approximately attached to the first protrusion 121 and the first gear 200 with a slight gap, so as to avoid excessive frictional resistance during rotation. With this structure, the first rotor 100 is integrated with the friction surface of the housing 300, and vibration and noise are reduced during rotation. In other embodiments, if only the rotatable fixing of the first rotor 100 relative to the housing 300 is considered, the first gear 200 may be replaced by another limiting member, and only the first sleeve portion 110 is required to be sleeved on a side away from the first shaft, and an end surface of the first sleeve portion abuts against a second end of the first annular wall 120 in the axial direction and protrudes out of the first annular wall 120 in the radial direction of the first annular wall 120. The limiting member may be, for example, only the plane connecting portion 220. The retaining member may be fixedly attached to the first sleeve portion 110 and/or the first annular wall 120, such as by welding or other means known to those skilled in the art.

The second rotor 400 includes a second sleeve portion 410 and a second sensing element 420 fixedly disposed on the second sleeve portion 410, wherein the second sleeve portion 410 is configured to be sleeved on a second shaft connected to the first shaft through a torsion bar.

The PCB500 is fixedly connected to the housing 300, and the PCB500 is provided with a first sensing module for sensing the rotation of the first sensing member 1211 and the second sensing member 420 and outputting a torque signal. Specifically, the PCB500 may sense the rotation of the first sensor 1211 and the second sensor 420 through electromagnetic induction, resistance strain sensor, inductive sensor, capacitive sensor, piezoelectric sensor, photoelectric sensor, or hall sensor, obtain the rotation angle of the first rotor 100 and the second rotor 400, and multiply the rotation angle by the torsion bar coefficient to obtain torque information, so as to output a torque signal. The specific structures of the first sensing member 1211, the second sensing member 420 and the first sensing module on the PCB500 may be configured by those skilled in the art according to the above sensing manner, which are well known in the art and will not be described in detail herein. The PCB500 is provided with an output interface 700, and the torque signal is output through the output interface 700. The first cover plate 600 is fixedly connected with the housing 300 through screws, and the PCB500 is clamped and fixed between the first cover plate 600 and the housing 300.

The second gear 800 includes a second gear body 810 engaged with the first gear 200, a third protrusion 820 having a circular truncated cone shape at an end surface of the second gear body 810, and a magnet 830 fixedly coupled to the third protrusion 820. In this embodiment, a groove is disposed on the lower side of the third protrusion 820, a protrusion matching with the shape of the groove is disposed on one side of the magnet 830 facing the groove, the protrusion is inserted into the groove, and the magnet 830 and the third protrusion 820 can be fixedly connected by a snap connection, an adhesive connection, or other connection methods known to those skilled in the art. A first receiving portion 320 is provided on the case 300 to match the shape of the third protrusion 820 and the magnet 830, and the third protrusion 820 and the magnet 830 are mounted in the first receiving portion 320. The second cover plate 900 is fixedly connected with the housing 300 by a snap, and the second gear 800 is clamped and fixed between the second cover plate 900 and the housing 300, so that the second gear 800 can only rotate relative to the housing 300. Therefore, when the first rotor 100 rotates, the first gear 200 rotates to drive the second gear 800 to rotate synchronously, that is, to drive the magnet 830 to rotate synchronously, and the PCB500 is further provided with a second sensing module for sensing the rotation condition of the magnet 830 to obtain the rotation angle of the first gear 200 (that is, the rotation angle of the first rotor 100), that is, the number of rotation turns of the first shaft.

Further, in some other embodiments of the induction sensor, the second gear 800 may not be provided, the housing 300 may not be provided with the corresponding first accommodating portion 320, and the first gear 200 may be replaced with another type of limiting portion as long as the limiting portion meets the limiting requirement as described above, so that the induction sensor may be used only for torque measurement.

The utility model also provides an electric power steering system, it includes inductive transducer, ECU the control unit and the motor in steering wheel, input shaft, output shaft, the above-mentioned arbitrary embodiment. The input shaft is fixedly connected with the steering wheel, and the output shaft is connected with the input shaft through a torsion bar; a first rotor of the induction sensor is fixedly sleeved on the input shaft, and a second rotor of the induction sensor is fixedly sleeved on the output shaft; the ECU control unit is connected with the PCB of the induction sensor to acquire torque information; the motor is connected with the ECU control unit.

The working principle of the electric power steering system is as follows: the steering wheel drives the input shaft and the output shaft to rotate when rotating, the inductive sensor acquires rotating torque information and outputs the rotating torque information to the ECU control unit, and the ECU control unit controls the motor to output rotating torque with corresponding size according to the torque information to drive wheels to steer. If not, the system does not work and is in a dormant state to wait for invocation. Due to the working characteristic of electric power steering, a driver can feel that the vehicle is driven, the direction feeling is better, the vehicle is more stable at high speed, and the direction does not drift in common words. And because it does not work when not turning, so also save the energy to a certain extent.

It should be noted that the embodiments of the present invention have better practicability and are not intended to limit the present invention in any way, and any person skilled in the art may change or modify the technical contents disclosed above to equivalent effective embodiments, but all the modifications or equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims (8)

1. A fixing structure of a rotor, comprising:

the first rotor (100) comprises a first sleeve part (110) and a first annular wall (120), the first sleeve part (110) is used for being fixedly sleeved on a first shaft, the first annular wall (120) is fixedly arranged on one side, away from the first shaft, of the first sleeve part (110), a first protruding part (121) is arranged at a first end of the first annular wall (120) in the axial direction, and the first protruding part (121) protrudes in the direction away from the first sleeve part (110);

the limiting piece (200) is sleeved on one side, away from the first axis, of the first sleeve part (110), the limiting piece (200) is fixedly connected to the first sleeve part (110) and/or the first annular wall (120), a first end face of the limiting piece (200) is attached to a second end, in the axial direction, of the first annular wall (120), and the limiting piece (200) protrudes out of the first annular wall (120) in the radial direction of the first annular wall (120);

the shell (300) comprises a second annular wall (310) coaxial with the first annular wall (120), a second bulge (311) is arranged on one side, facing the first annular wall (120), of the second annular wall (310) along the circumferential direction, the side, facing the first annular wall (120), of the second bulge (311) abuts against one side, far away from the first sleeve part (110), of the first annular wall (120), the first end, in the axial direction, of the second bulge (311) abuts against the first bulge (121), and the second end, in the axial direction, of the second bulge (311) abuts against the first end face of the limiting piece (200).

2. The fixation structure of claim 1,

the first end face of the limiting piece (200) is connected with the second end of the first annular wall (120) through laser welding.

3. An inductive sensor, characterized in that,

comprising a fixation structure according to any one of claims 1-2, wherein a first induction member (1211) is arranged on the first rotor (100);

the inductive sensor further comprises:

the second rotor (400), the second rotor (400) includes the second sleeve section (410) and fixes the second reaction piece (420) on the said second sleeve section (410), the said second sleeve section (410) is used for covering and setting up on a second axle that connects with said first axle through the torsion bar;

the PCB (500), the PCB (500) is fixedly connected with the shell (300), and the PCB (500) is used for sensing the rotation of the first sensing element (1211) and the second sensing element (420) and outputting a torque signal.

4. The inductive sensor of claim 3,

the PCB (500) is configured to sense rotation of the first sensing member (1211) and the second sensing member (420) through electromagnetic induction, resistance strain gauge sensing, inductive sensing, capacitive sensing, piezoelectric sensing, photoelectric sensing, or hall sensing.

5. The inductive sensor of claim 3,

the inductive sensor further comprises a first cover plate (600);

the first cover plate (600) is fixedly connected with the shell (300), and the PCB (500) is clamped and fixed between the first cover plate (600) and the shell (300).

6. The inductive sensor of any one of claims 3 to 5,

the limiting piece (200) is a first gear;

the inductive sensor further comprises a second gear (800) and a second cover plate (900);

the second gear (800) comprises a second gear body (810) meshed with the first gear, a third boss (820) in a truncated cone shape positioned on one end face of the second gear body (810), and a magnet (830) fixedly connected to the third boss (820);

the shell (300) is provided with a first accommodating part (320) matched with the third protruding part (820) and the magnet (830) in shape, and the third protruding part (820) and the magnet (830) are installed in the first accommodating part (320);

the second cover plate (900) is fixedly connected with the shell (300), and the second gear (800) is clamped and fixed between the second cover plate (900) and the shell (300);

the PCB (500) is used for sensing the rotation condition of the magnet (830) and acquiring the rotation angle of the first gear.

7. The inductive sensor of claim 6,

the first gear comprises a first gear body (210) and a plane connecting portion (220), a first end face of the plane connecting portion (220) is attached to a second end of the first annular wall (120) in the axial direction of the plane connecting portion, the plane connecting portion (220) protrudes out of the first annular wall (120) in the radial direction of the first annular wall (120), and the first gear body (210) is fixedly arranged on the second end face of the plane connecting portion (220).

8. An electric power steering system characterized by comprising:

a steering wheel;

an input shaft connected to the steering wheel;

an output shaft connected with the input shaft through a torsion bar;

the inductive sensor of any one of claims 3 to 7, a first rotor (100) of the inductive sensor being fixedly mounted on the input shaft and a second rotor (400) of the inductive sensor being fixedly mounted on the output shaft;

an ECU control unit connected with the PCB (500) of the induction sensor;

and the motor is connected with the ECU control unit.

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