CN221162978U - Driving mechanism of electric steering gear, steering system and vehicle - Google Patents

Abstract

The application provides an electric steering gear driving mechanism, a steering system and a vehicle, and belongs to the technical field of automobile parts; a hollow cavity is arranged in the motor along the axial direction, and the lead screw is arranged in the motor in a penetrating way through the hollow cavity; the nut is in screw transmission connection with the screw rod, the nut is connected with the rotor, and the nut is integrated in the motor; according to the driving mechanism of the electric steering gear, the hollow cavity is arranged in the motor, so that the screw rod penetrates through the hollow cavity and is arranged in the motor in a penetrating way, meanwhile, the nut is integrated in the motor and is connected with the rotor, and the rotor directly drives the nut to rotate, so that the number of parts is reduced, the whole structure is simplified, the integration level is higher, the assembly is more convenient, and the cost is low.

Description

Driving mechanism of electric steering gear, steering system and vehicle

Technical Field

The application relates to the technical field of automobile accessories, in particular to an electric steering gear driving mechanism, a steering system and a vehicle.

Background

The motor driving mechanism is an important component of the electric power steering gear, when the steering system works, the motor receives a control signal and outputs torque, the torque is transmitted to the belt wheel on the nut through the synchronous belt to reduce speed and increase torque, the belt wheel is in interference connection with the nut, power is transmitted to the nut, the nut rotates to transmit power to the screw rod, the screw rod transmits axial thrust to the ball head pull rods at two ends, and the pull rods push the wheels to realize steering. The existing electric steering gear driving mechanism has the defects of more parts, complex structure, complex assembly, large space occupation, high cost and the like.

Disclosure of utility model

In view of the above, the present application aims to provide an electric steering gear driving mechanism, so as to solve the problems of more parts, complex structure and large space occupation of the steering gear driving mechanism in the prior art.

In order to achieve the above purpose, the technical scheme of the application is realized as follows:

An electric power steering gear drive mechanism comprising: the device comprises a motor, a screw rod and a nut;

The motor comprises a stator and a rotor, and the rotor can rotate relative to the stator;

A hollow cavity is arranged in the motor along the axial direction, and the lead screw is arranged in the motor in a penetrating way through the hollow cavity;

The nut is in screw transmission connection with the screw rod, the nut is connected with the rotor, and the nut is integrated in the motor.

Through above-mentioned technical scheme, through setting up the cavity in the inside of motor, make the lead screw pass this cavity and run through the setting in the motor, the nut integration is inside the motor and be connected with the rotor, the rotor can direct drive nut rotate, the hold-in range reduction gear among the prior art has been cancelled, part quantity and space occupation have been reduced, transmission efficiency is higher, the running noise is little, assembly process is simple, the reliability is higher.

Further, the motor comprises a first shell, a second shell and a third shell;

the stator is fixed on the first shell;

The rotor is fixed on the second shell, the second shell is arranged inside the first shell, and the second shell is coaxial with and rotationally connected with the first shell;

The nut is rotatably installed in the third shell, the third shell is connected with one end of the first shell, and a through hole for the screw rod to pass through is formed in the end of the third shell.

Through the technical scheme, the first shell is used as the installation foundation of the stator, the second shell is used as the installation foundation of the rotor, the third shell is used as the installation foundation of the nut, and the through hole formed in the third shell is convenient for the screw rod to pass through, so that the screw rod can pass through and be arranged in the motor.

Further, the first shell comprises an outer shell and an inner shell which are integrally connected, the hollow cavity is arranged in the inner shell, and the screw rod passes through the hollow cavity and is arranged in the first shell; an annular space is formed between the inner housing and the outer housing, and the second housing is disposed in the annular space.

Through above-mentioned technical scheme, first casing adopts bilayer structure, and the annular space that forms between shell body and the inner shell can be used to the internals of motor such as installation rotor, stator, simple structure, convenient assembling.

Further, the nut is connected with the third shell through a first bearing.

Through the technical scheme, the first bearing can be used for realizing the rotary connection between the nut and the third shell.

Further, the nut is coaxially connected with the second shell through a coupler.

Through the technical scheme, the coaxial connection between the nut and the second shell can be realized by using the coupler, so that the rotor, the second shell and the nut can synchronously rotate.

Further, one end, close to the nut, of the first shell is connected with one end, far away from the nut, of the second shell through a second bearing, and the first shell is connected with one end, far away from the nut, of the second shell through a third bearing.

Through above-mentioned technical scheme, the both ends of first casing and second casing use second bearing and third bearing to be connected respectively, have realized that the rotation of first casing and second casing is connected, convenient assembling.

Further, a locking piece is arranged at one end, close to the nut, of the second shell, the locking piece is in threaded connection with the second shell, and the end face of the locking piece is abutted against the end face of the second bearing; the locking piece is used for limiting the axial direction of the second bearing.

Through above-mentioned technical scheme, use the retaining member to support the terminal surface of second bearing tightly in second bearing department, realize the spacing to the second bearing axial, ensure the stability of installation.

Further, a magnetic ring is fixed on the locking piece, and a magnetic field sensor is installed in the third shell and is used for detecting the rotating position of the nut in cooperation with the magnetic ring.

Through above-mentioned technical scheme, through setting up magnetic ring and magnetic field inductor, when rotor drive nut rotated, can detect nut pivoted position, can calculate the distance that obtains the lead screw that corresponds under this position according to the lead relation of lead screw and nut and remove to the auxiliary state of judging the wheel and turning to, more intelligent, humanized.

Compared with the prior art, the driving mechanism of the electric steering gear has the following advantages:

(1) The driving mechanism of the electric steering gear comprises a motor, a screw rod and a nut, wherein the motor comprises a stator and a rotor, and the rotor can rotate relative to the stator; a hollow cavity is arranged in the motor along the axial direction, and the lead screw is arranged in the motor in a penetrating way through the hollow cavity; the nut is in screw transmission connection with the screw rod, the nut is connected with the rotor, and the nut is integrated in the motor; according to the application, the nut is integrated in the motor and is connected with the rotor, and the rotor directly drives the nut to rotate so as to drive the screw rod to axially move, so that compared with the prior art, the number of parts is reduced, the integral structure is simplified, the assembly is convenient, and meanwhile, the transmission efficiency is higher; through the inside at the motor sets up the cavity, makes the lead screw pass this cavity and runs through the setting in the motor, has guaranteed the ascending stroke of lead screw axle, has improved the integrated level of structure simultaneously, has optimized spatial layout.

(2) According to the driving mechanism of the electric steering gear, the magnetic ring is fixed on the locking piece, the magnetic field sensor is arranged in the third shell, the magnetic field sensor is matched with the magnetic ring to detect the rotating position of the nut, and the moving distance of the screw rod can be calculated according to the rotating angle or the number of turns of the nut, so that the steering state of the wheel can be judged.

(3) The first shell comprises an outer shell and an inner shell which are integrally connected, the hollow cavity is arranged in the inner shell, and the lead screw passes through the hollow cavity and is arranged in the first shell; an annular space is formed between the inner shell and the outer shell, and the second shell is arranged in the annular space; through setting up first casing into inside and outside bilayer structure, provide the cavity that can run through the setting for the lead screw, provide annular installation space for internals such as rotor, stator moreover, simple structure, it is reasonable to arrange.

The application also proposes a steering system comprising an electric steering gear drive mechanism as described above.

The steering system has the same advantages as the driving mechanism of the electric steering gear compared with the prior art, and is not repeated here.

The application also proposes a vehicle comprising an electric power steering drive mechanism as described above, or comprising a steering system as described above.

The vehicle has the same advantages as the electric power steering apparatus driving mechanism described above over the prior art, and will not be described in detail here.

Drawings

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

Fig. 1 is a schematic structural view of a driving mechanism of an electric power steering apparatus according to an embodiment of the present application.

Reference numerals illustrate:

1. A stator; 2. a rotor; 3. a nut; 4. a screw rod; 5. a first housing; 51. an outer housing; 52. an inner housing; 53. a connection part; 6. a second housing; 7. a third housing; 8. a first bearing; 9. a coupling; 10. a second bearing; 11. a third bearing; 12. a locking member; 13. and a magnetic ring.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

In addition, references to "upper", "lower", "left", "right", "inner", "outer", etc. in embodiments of the present application are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application. Moreover, relational terms such as "first," "second," "third," and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities or order, nor should it be construed as indicating or implying relative importance.

The application will be described in detail below with reference to the drawings in connection with embodiments.

In the related art, when the steering system works, the motor receives a control signal and outputs torque, the control signal is transmitted to the belt pulley on the nut through the synchronous belt to reduce speed and increase torque, the belt pulley is in interference connection with the nut, power is transmitted to the nut, the nut rotates to transmit power to the screw rod, the screw rod transmits axial thrust to the ball head pull rods at two ends, and the pull rods push the wheels to realize steering. In the prior steering gear motor driving mechanism, a synchronous belt speed reducing mechanism is used for transmission, the number of parts is large, the assembly process is complex, and energy loss exists; when the assembly receives impact, the synchronous belt speed reducing mechanism may be damaged by tooth jump, and tension is possibly loosened after durability; in addition, the synchronous belt speed reducing mechanism is loud in noise in the operation process, so that the use experience is greatly influenced.

In view of the above, the embodiment of the application provides an electric power steering apparatus driving mechanism.

Referring to fig. 1, an electric power steering apparatus driving mechanism includes a motor, a lead screw 4, and a nut 3.

The motor comprises a stator 1 and a rotor 2, wherein the rotor 2 can rotate relative to the stator 1; a hollow cavity is arranged in the motor along the axial direction, and the lead screw 4 is arranged in the motor in a penetrating way through the hollow cavity; the nut 3 is in screw transmission connection with the screw 4, the nut 3 is connected with the rotor 2, and the nut 3 is integrated in the motor.

Specifically, the stator 1, the rotor 2, the screw 4 and the nut 3 are coaxially arranged, the rotor 2 is arranged outside or inside the stator 1 and is rotatable relative to the stator 1, the nut 3 is arranged on the screw 4 in a penetrating manner, and the nut 3 is connected with the rotor 2. When the steering system works, the motor receives a control signal, the rotor 2 of the motor rotates to output torque, the nut 3 is integrated inside the motor and is connected with the rotor 2, the rotor 2 directly drives the nut 3 to synchronously rotate, the nut 3 is sleeved on the periphery of the screw 4, the torque output by the rotor 2 can be transmitted to the screw 4 through threaded fit with the screw 4, the screw 4 makes linear motion along the axial direction of the screw 4, the screw 4 is connected to a ball head pull rod of a vehicle, axial thrust can be transmitted to the ball head pull rod, and the ball head pull rod pushes wheels to steer.

Through integrating nut 3 into the motor to be connected with rotor 2, cancelled hold-in range reduction gears with prior art, rotor 2 directly drives nut 3 rotation, simplified actuating mechanism's overall structure, reduced part quantity, still avoided the energy loss that hold-in range reduction gears exists simultaneously, jump the tooth damage, noise big scheduling problem.

The motor adopts hollow structure, and inside along the axial setting hollow cavity is used for installing lead screw 4, makes lead screw 4 run through and sets up in the motor, has guaranteed the ascending stroke of lead screw 4 axial, has realized the integration of lead screw 4 and motor simultaneously, has improved whole actuating mechanism's integrated level, has reduced the space and has taken up, has optimized spatial arrangement.

Further, ball cooperation can be adopted between the screw 4 and the nut 3, and the balls can reduce friction force between the screw 4 and the nut 3, so that transmission efficiency and accuracy are improved. The specific structure and transmission principle of the ball screw 4 are well known to those skilled in the art, and will not be described here.

Alternatively, in other embodiments, the combination of the screw 4 and the nut 3 may be replaced by a combination of a trapezoidal screw and a nut, and the screw driving is realized in a trapezoidal thread matching manner.

Further, the motor includes a first housing 5, a second housing 6, and a third housing 7; the stator 1 is fixed on the first housing 5; the rotor 2 is fixed on the second shell 6, the second shell 6 is arranged inside the first shell 5, and the second shell 6 is coaxially and rotatably connected with the first shell 5; the nut 3 is rotatably installed in the third housing 7, the third housing 7 is connected to one end of the first housing 5, and a through hole through which the screw 4 passes is formed in the end of the third housing 7.

Specifically, the first housing 5 is used as a mounting base of the coil of the stator 1, the second housing 6 is used as a mounting base of the magnet of the rotor 2, and the second housing 6 is mounted inside the first housing 5 and rotatable relative to the first housing 5; the third casing 7 is used as the installation basis of the nut 3, is connected at one end of the first casing 5 and is used for closing the end, a through hole is formed in the third casing 7, the lead screw 4 penetrates through the third casing 7 from the through hole to enter the motor, and penetrates out of one end, far away from the third casing 7, of the first casing 5, so that the lead screw 4 penetrates through the motor.

Further, the first housing 5 includes an outer housing 51 and an inner housing 52 integrally connected, the hollow cavity is provided inside the inner housing 52, and the screw 4 is provided in the first housing 5 through the hollow cavity; the inner housing 52 and the outer housing 51 form an annular space therebetween, and the second housing 6 is disposed in the annular space.

As shown in fig. 1, the first housing 5 adopts a double-layer structure, and comprises an outer housing 51 arranged on an outer layer and an inner housing 52 arranged on an inner layer, wherein a cylindrical hollow cavity is formed in the middle of the inner housing 52 and can be used for a screw 4 to pass through; the left end of shell body 51 and interior casing 52 passes through connecting portion 53 to be connected integratively, forms the annular space between the outer wall of interior casing 52, the inner wall of connecting portion 53 and the inner wall of shell body 51, and the annular space can be used to the interior part of installing motors such as rotor 2, stator 1, and the existence of connecting portion 53 makes the left end of annular space closed, and the right-hand member at shell body 51 is installed to the third casing 7 simultaneously, can effectively protect motor interior part not expose, makes whole actuating mechanism outward appearance clean and tidy, safe and reliable.

The second housing 6 is disposed in the annular space, specifically, the second housing 6 is sleeved outside the inner housing 52, the rotor 2 magnet is fixed on the inner wall of the second housing 6, the stator 1 coil is fixed on the outer wall of the inner housing 52, and the rotor 2 magnet is further disposed outside the stator 1 coil and rotates relative to the stator 1 coil to form an outer rotor structure.

Alternatively, in other embodiments, the stator 1 coil may be fixed on the inner wall of the outer casing 51, and the rotor 2 magnet may be fixed on the outer wall of the second casing 6, so that the rotor 2 magnet is disposed inside the stator 1 coil and rotates relative to the stator 1 coil to form an inner rotor structure.

According to the embodiment, through setting the first shell 5 into a double-layer structure, a hollow cavity capable of being penetrated is provided for the screw rod 4, an annular installation space is provided for internal parts such as the rotor 2 and the stator 1, one end of the outer shell 51 and one end of the inner shell 52 are connected into a whole through the connecting part 53, one end of the annular space is closed, one end of the outer shell 51, far away from the connecting part 53, is connected with the third shell 7, the other end of the annular space is closed, the internal parts of the motor are protected from being exposed, and the structure is neat and attractive.

Further, the nut 3 is connected to the third housing 7 via a first bearing 8.

As shown in fig. 1, the left end of the nut 3 is connected to the second housing 6, and the right end of the nut 3 is connected to the third housing 7. The inner ring of the first bearing 8 is fixed to the nut 3, and the outer ring of the first bearing 8 is fixed to the inner wall of the third housing 7, so that the nut 3 is rotatably installed in the third housing 7. Optionally, a limiting block can be arranged at the left end of the first bearing 8, the right end face of the limiting block is abutted against the left end face of the first bearing 8, and the right end face of the first bearing 8 is abutted against the inner wall of the third shell 7, so that the first bearing 8 is limited in the axial direction, and stable installation is ensured.

Further, the nut 3 and the second housing 6 are coaxially connected by a coupling 9.

The coupler is a device which connects two shafts or the shafts and a rotating member to rotate together in the process of transmitting motion and power and is not disconnected under normal conditions. Through set up shaft coupling 9 between second casing 6 and nut 3, realized the coaxial coupling of second casing 6 and nut 3, and guaranteed the stability of connection, rotor 2 and nut 3 are all connected jointly on second casing 6, and when the motor starts, rotor 2, second casing 6, nut 3 three synchronous rotation have realized the direct drive of rotor 2 to nut 3.

Further, the first housing 5 is connected to the end of the second housing 6 near the nut 3 through a second bearing 10, and the first housing 5 is connected to the end of the second housing 6 far from the nut 3 through a third bearing 11.

Specifically, a connecting block is disposed on the right end inner wall of the outer casing 51, a second bearing 10 is disposed between the connecting block and the second casing 6, an inner ring of the second bearing 10 is fixed to an outer wall of the second casing 6, and an outer ring of the second bearing 10 is fixed to the connecting block, so that the outer casing 51 is rotationally connected to the second casing 6.

The third bearing 11 is arranged at the left ends of the outer shell 51 and the second shell 6, the inner ring of the third bearing 11 is fixed with the outer wall of the second shell 6, and the outer ring of the third bearing 11 is fixed with the inner wall of the outer shell 51, so that the outer shell 51 and the second shell 6 are rotatably connected.

Further, in order to ensure the mounting stability of the bearing, a step surface may be provided at a position where the bearing is mounted on the first housing 5 or the second housing 6, and the step surface may abut against an end surface of the bearing to limit the axial direction of the bearing. For example, in the present embodiment, a first step surface is machined at the right end of the second housing 6, the first step surface abuts against the left end surface of the second bearing 10, and a second step surface is machined at the left end of the second housing 6, the second step surface abuts against the right end surface of the third bearing 11.

Further, a locking member 12 is disposed at one end of the second housing 6 near the nut 3, the locking member 12 is in threaded connection with the second housing 6, and an end surface of the locking member 12 abuts against an end surface of the second bearing 10; the locking member 12 is used for limiting the axial direction of the second bearing 10.

Specifically, the internal thread is machined in the locking member 12, the external thread is machined on the outer wall of the second shell 6, the locking member 12 is matched with the second shell 6 through threads, as shown in fig. 1, when the locking member 12 is mounted, the locking member 12 is sleeved at the right end of the second shell 6, and the locking member 12 is rotated until the left end face of the locking member abuts against the right end face of the inner ring of the second bearing 10, so that the limiting of the second bearing 10 in the axial direction is realized, and the mounting stability is further ensured.

Further, a magnetic ring 13 is fixed on the locking member 12, and a magnetic field sensor is installed in the third housing 7, and the magnetic field sensor is used for detecting the rotating position of the nut 3 in cooperation with the magnetic ring 13.

Specifically, the rotor 2 and the nut 3 are connected with the second housing 6, when the rotor 2 rotates, the second housing 6 and the nut 3 synchronously rotate, and the locking piece 12 is fixedly connected with the second housing 6, so that the second housing 6 rotates to drive the locking piece 12 to synchronously rotate, and the magnetic ring 13 is fixed on the locking piece 12, so that the locking piece 12 rotates to drive the magnetic ring 13 to synchronously rotate, the magnetic ring 13 rotates to generate magnetic field change, and the magnetic field sensor can detect the rotating position of the nut 3 according to the sensed magnetic field change. According to the angle or the number of turns of the nut 3, according to the lead relation corresponding to the nut 3 and the screw 4, the moving distance of the screw 4 can be calculated, for example, the nut 3 rotates for one turn, the screw 4 moves for 8mm, and the steering state of the wheel can be judged in an auxiliary mode according to the moving distance of the screw 4, so that the steering device is more intelligent and humanized.

According to the driving mechanism of the electric steering gear, the nut 3 is integrated in the motor and connected with the rotor 2, and the motor rotor 2 directly drives the nut 3 on the ball screw 4, so that a synchronous belt speed reducing mechanism in a traditional steering driving mechanism is omitted, the rotation speed is low, the torque is high, the transmission efficiency is high, the running noise is low, the reliability is high, and the number of parts and the manufacturing process are simplified; the motor adopts hollow structure, sets up the cavity in the inside of motor, makes lead screw 4 pass this cavity and runs through the setting in the motor, has guaranteed the ascending stroke of lead screw 4 axial, and overall structure retrencies, and the integrated level is high, has good assemblability and disassemblability, has reduced manufacturing cost and assembly cost.

The embodiment of the application also provides a steering system which comprises the electric steering device driving mechanism.

The steering system has the same advantages as the driving mechanism of the electric steering gear compared with the prior art, and is not repeated here.

The embodiment of the application also provides a vehicle comprising the electric steering device driving mechanism or the steering system.

The vehicle has the same advantages as the electric power steering apparatus driving mechanism described above over the prior art, and will not be described in detail here.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the application.

Claims (10)

1. An electric power steering apparatus driving mechanism, comprising:

The motor, the screw rod (4) and the nut (3);

the motor comprises a stator (1) and a rotor (2), wherein the rotor (2) can rotate relative to the stator (1);

A hollow cavity is arranged in the motor along the axial direction, and the lead screw (4) is arranged in the motor in a penetrating way through the hollow cavity;

The nut (3) is in screw transmission connection with the screw rod (4), the nut (3) is connected with the rotor (2), and the nut (3) is integrated in the motor.

2. The electric power steering gear drive mechanism according to claim 1, wherein:

the motor comprises a first shell (5), a second shell (6) and a third shell (7);

The stator (1) is fixed on the first shell (5);

The rotor (2) is fixed on the second shell (6), the second shell (6) is arranged inside the first shell (5), and the second shell (6) is coaxial with the first shell (5) and is rotationally connected;

The nut (3) is rotatably arranged in the third shell (7), the third shell (7) is connected with one end of the first shell (5), and a through hole for the lead screw (4) to pass through is formed in the end part of the third shell (7).

3. The electric power steering gear drive mechanism according to claim 2, wherein:

The first shell (5) comprises an outer shell (51) and an inner shell (52) which are integrally connected, the hollow cavity is arranged in the inner shell (52), and the screw rod (4) passes through the hollow cavity and is arranged in the first shell (5); an annular space is formed between the inner housing (52) and the outer housing (51), and the second housing (6) is disposed in the annular space.

4. The electric power steering gear drive mechanism according to claim 2, wherein: the nut (3) is connected with the third shell (7) through a first bearing (8).

5. The electric power steering gear drive mechanism according to claim 2, wherein: the nut (3) is coaxially connected with the second shell (6) through a coupler (9).

6. The electric power steering gear drive mechanism according to claim 2, wherein: the first shell (5) and one end of the second shell (6) close to the nut (3) are connected through a second bearing (10), and one end of the first shell (5) and one end of the second shell (6) far away from the nut (3) are connected through a third bearing (11).

7. The electric power steering gear drive mechanism according to claim 6, wherein: one end of the second shell, which is close to the nut (3), is provided with a locking piece (12), the locking piece (12) is in threaded connection with the second shell (6), and the end surface of the locking piece (12) is abutted against the end surface of the second bearing (10); the locking piece (12) is used for limiting the axial direction of the second bearing (10).

8. The electric power steering gear drive mechanism according to claim 7, wherein: a magnetic ring (13) is fixed on the locking piece (12), and a magnetic field sensor is arranged in the third shell (7) and is used for detecting the rotating position of the nut (3) in cooperation with the magnetic ring (13).

9. A steering system comprising the electric power steering gear drive mechanism according to any one of claims 1 to 8.

10. A vehicle comprising the electric power steering drive mechanism according to any one of claims 1 to 8, or comprising the steering system according to claim 9.