Ball screw double-motor power steering gear

Abstract

The invention provides a ball screw double-motor power steering gear. The ball screw double-motor power steering gear comprises a steering shaft rod, a ball bearing structure, two motors, two shells and two controllers. Wherein the steering shaft rod comprises a screw rod part and a tooth row part, and the ball bearing structure is arranged on the screw rod part of the steering shaft rod in a sleeving mode. The two motors are arranged on the two sides of the ball bearing structure respectively and each comprise a motor rotor and a motor stator, the motor rotors and the motor stators are hollow, the steering shaft rod penetrates through the hollow portions of the motor rotors and the motor stators, the motor rotors are locked to the ball bearing structure, and the two controllers are electrically connected to the two motors respectively. And the two controllers are electrically connected with each other. Wherein the two controllers control one of the two motors to drive the motor rotor to drive the ball bearing structure to rotate, and the ball bearing structure drives the steering shaft rod to move in the axial direction of the steering shaft rod.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing devices, and in particular to a ball screw dual-motor power steering machine. Background Art

[0002] The reflux ball screw device is widely used in various mechanical equipment. Its main function is to convert the rotary motion of the ball into linear motion, so that the machine or object carried by it can do work in the linear direction to provide precise transmission function. However, in order to make the ball circulate in the ball bearing, it is necessary to grind the bearing sleeve to form the ball groove. Each time the bearing sleeve is ground, the ball groove of each bearing sleeve may have errors due to the influence of the machining precision. This will cause the ball bearing to have noise, vibration, and reflux problems, which seriously affects the machining precision.

[0003] Generally speaking, ball screw devices are usually driven by motors. When only a single motor is used to drive the device, when the motor fails, the screw drive device will not be able to operate, which will affect the overall processing efficiency. In addition, when only one side of the motor is used for transmission, in addition to the problem of unbalanced weight of the device relative position, when the screw is driven by a single motor, the axial thrust is transmitted from one end of the screw to the other end for a long time, which may cause the far end of the screw to have problems such as lead error and weakened driving force. The long-term accumulation of this error will seriously affect the precision of the processing.

[0004] Therefore, how to design a ball screw dual motor power steering machine that can reduce the resistance of the balls in the ball bearing structure through the return path and drive the ball screw through dual motors and controllers, thereby solving the technical problems of the prior art, is an important topic studied by the inventors of the present invention. Summary of the invention

[0005] In view of this, the inventor has accumulated many years of research and practical experience in related fields and invented a ball screw dual-motor power steering machine to improve the problems in the above-mentioned prior art.

[0006] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a ball screw dual motor power steering machine, including: a steering shaft, which includes a screw portion and a gear row portion; a ball bearing structure, which is sleeved on the screw portion of the steering shaft; two motors, respectively arranged on both sides of the ball bearing structure, the two motors respectively include a motor rotor and a motor stator, the motor rotor and the motor stator are respectively hollow, and the steering shaft is penetrated through the hollow part, and the motor rotor is locked to the ball bearing structure; two shells, respectively connected tubular structures, and one end of the two shells is respectively locked to the two sides of the ball bearing structure, and the steering shaft, the ball bearing structure, and the motor are accommodated therein; and two controllers are arranged on the two shells, and are electrically connected to the two motors respectively, and the two controllers are electrically connected to each other. Among them, one of the two motors drives the motor rotor to drive the ball bearing structure to rotate, and the ball bearing structure drives the steering shaft to move along its axial direction.

[0007] Preferably, the screw portion has a circular cross-section, and the tooth row portion has a rectangular cross-section. The ball screw dual-motor power steering machine further includes a support member, which is arranged on one side of the tooth row portion, and the support member has a rectangular groove matching the tooth row portion.

[0008] Preferably, the ball bearing structure includes: an inner ring, which is sleeved on the screw portion of the steering shaft, and a plurality of first ball members are provided between the inner ring of the circulator and the screw portion of the circulator, and the two sides of the inner ring are respectively engaged with the motor rotors of the two motors; an outer ring, which is sleeved on the inner ring of the circulator, and a plurality of second ball members are provided between the inner ring of the circulator and the outer ring of the circulator; and two ball circulators, which are arranged in the inner ring of the circulator. Wherein, the two ball circulators respectively include: a threaded portion, which is provided on one side of the ball circulator, and has a groove corresponding to the screw portion of the circulator and is embedded in the screw portion of the circulator; a guide portion, which is provided on the other side of the ball circulator relative to the threaded portion of the circulator, and has an arc-shaped guide groove; and a fixing portion, which is provided on one side between the threaded portion of the circulator and the guide portion of the circulator, and the fixing portion of the circulator is fixed to the inner ring of the circulator.

[0009] Preferably, the first ball member has a ball diameter, and the guide groove of the ball circulator has a guide curvature radius, and the guide curvature radius is twice the ball diameter.

[0010] Preferably, the ball screw dual motor power steering machine includes a planetary reduction mechanism, which is arranged between one of the two motors and the ball bearing structure, and the planetary reduction mechanism includes: a driving gear member, which is arranged at one end of the motor rotor; a plurality of reduction gear members, which are arranged on one side of the ball bearing structure and meshed with the driving gear member; an internal gear member, which is sleeved on the plurality of reduction gear members, and the inner side of the internal gear member is meshed with the plurality of reduction gear members, and the outer ring surface of the internal gear member is provided with a flange part, and the flange part is provided with a plurality of locking holes. Among them, the internal gear member is combined with the ball bearing structure through the plurality of locking holes, and one of the two motors drives the ball bearing structure to rotate via the planetary reduction mechanism, and the ball bearing structure drives the steering shaft to move along its axial direction.

[0011] In summary, the present invention provides a ball screw dual motor power steering machine, wherein the ball bearing structure of the ball screw dual motor power steering machine has an independently arranged ball circulator. Compared with the usual bearing sleeves that are ground to form ball grooves, the ball circulator of the ball bearing structure of the present invention can be independently mass-produced and subsequently installed in the ball bearing structure, thereby reducing the error of the guide groove during the production process of the ball circulator, and reducing the manufacturing cost of forming a reflux channel, effectively avoiding noise, vibration, and reflux problems, which is conducive to improving processing precision. In addition, the guide curvature radius of the guide groove of the ball circulator of the ball bearing structure of the present invention is set to twice the ball diameter of the ball member, thereby further avoiding noise, vibration, and reflux problems that may occur during the reflux process.

[0012] In addition, the ball screw dual motor power steering machine of the present invention is provided with motors on both sides of its ball bearing structure, so as to cooperate with each controller to drive the work of the ball screw dual motor power steering machine through the dual motor structure. Through this configuration, when any one of the controllers detects that an abnormality occurs in the motor, the controller can shut down the abnormal motor in real time, and the other controller can start the normal motor to continue operation, so that in the event of an abnormality, the ball screw dual motor power steering machine as a whole can still operate normally, thereby improving the operating efficiency of the motor and reducing the dangers that may be caused by equipment abnormality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments;

[0014] Figure 1 A schematic diagram of a partial structure of a ball screw dual-motor power steering machine according to an embodiment of the present invention;

[0015] Figure 2Schematic diagram of the appearance of a ball screw dual-motor power steering machine according to an embodiment of the present invention;

[0016] Figure 3 A schematic diagram of a steering shaft of a ball screw dual-motor power steering machine according to an embodiment of the present invention;

[0017] Figure 4 A schematic diagram of a gear row portion and a worm gear of a steering shaft of a ball screw dual-motor power steering machine according to an embodiment of the present invention;

[0018] Figure 5 A schematic diagram of a ball bearing structure of a ball screw dual-motor power steering machine according to an embodiment of the present invention;

[0019] Figure 6 A schematic diagram of the internal structure of a ball bearing structure of a ball screw dual-motor power steering machine according to an embodiment of the present invention;

[0020] 7A to 7D Schematic diagram of a ball circulator of a ball bearing structure of a ball screw dual-motor power steering machine according to an embodiment of the present invention. Description of Reference Numerals 1: Ball screw dual motor power steering machine 10: Ball bearing structure 11: Inner ring 111, 1411: Locking hole 12: First ball bearing 13: Inner ring spacer 14: Outer ring 141: Support flange 15: Second ball bearing 16: Ball Circulator 161: Threaded part 162: diversion part 1621: Diversion groove 163: Fixed part 1631: Fixed bump 21: Steering shaft 211: Screw part 212: Gear row 213: Support 22: Motor 221: Motor stator 222: Motor coil 223: Motor rotor 23: Turbo 24: Controller 25: Shell R: Radius of curvature of the flow guide d: ball diameter DETAILED DESCRIPTION

[0021] In order to facilitate understanding of the technical features, contents and advantages of the present invention and the effects that can be achieved, the present invention is now described in detail in the form of embodiments in conjunction with the accompanying drawings. The drawings used therein are only for illustration and auxiliary explanation, and are not necessarily the actual proportions and precise configurations after the implementation of the present invention. Therefore, the present invention should not be interpreted as being limited to the scope of the actual implementation method based on the proportions and configuration relationships of the drawings.

[0022] It should be understood that although the terms "first", "second", etc. may be used in the present invention to describe various components, parts, regions, layers and / or parts, these components, parts, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one component, part, region, layer and / or part from another component, part, region, layer and / or part. Therefore, the "first component", "first part", "first region", "first layer" and / or "first part" discussed below may be referred to as the "second component", "second part", "second region", "second layer" and / or "second part" without departing from the spirit and teachings of the present invention.

[0023] In addition, the terms “include” and / or “comprise” refer to the presence of stated features, regions, wholes, steps, operations, components and / or parts, but do not exclude the presence or addition of one or more other features, regions, wholes, steps, operations, components, parts and / or combinations thereof.

[0024] Unless otherwise defined, all terms (including technical and scientific terms) used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs. It is understood that terms such as those defined in commonly used dictionaries should be interpreted as having definitions consistent with their meanings in the context of the relevant technology and the present invention, and will not be interpreted as idealized or overly formal meanings unless explicitly defined in this article.

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore are not intended to limit the present invention.

[0026] See also Figures 1 to 4 , Figure 1 A schematic diagram of a partial structure of a ball screw dual-motor power steering machine according to an embodiment of the present invention; Figure 2 Schematic diagram of the appearance of a ball screw dual-motor power steering machine according to an embodiment of the present invention; Figure 3is a schematic diagram of a steering shaft according to an embodiment of the present invention; and Figure 4 The figure is a schematic diagram of a gear row portion and a worm gear of a steering shaft of a ball screw dual-motor power steering machine according to an embodiment of the present invention.

[0027] like Figures 1 to 3 As shown, the present invention provides a ball screw dual-motor power steering machine 1, including: a steering shaft 21, which includes a screw portion 211 and a gear portion 212; a ball bearing structure 10, which is sleeved on the screw portion 211 of the steering shaft 21; two motors 22, each motor 22 includes a motor rotor 223 and a motor stator 221, the motor rotor 223 and the motor stator 221 are respectively hollow, and the steering shaft 21 is penetrated through the hollow portion, and the motor rotor 223 is locked to the ball bearing structure 10. Among them, one of the two motors 22 drives the motor rotor 223 to drive the ball bearing structure 10 to rotate, and the ball bearing structure 10 drives the steering shaft 21 to move along its axial direction. Among them, the detailed structure of the ball bearing structure 10 will be referred to below. Figures 5 to 7D The following is an explanation of the technical features of the ball screw dual-motor power steering machine 1.

[0028] Specifically, in this embodiment, Figure 1 and Figure 2 As shown, the ball screw dual motor power steering machine 1 of the present invention uses an outer motor as the motor 22, and one end of the motor rotor 223 of the motor 22 can be locked to the locking hole 111 on one side of the inner ring 11, so that when the motor 22 drives the motor rotor 223 to rotate, the ball bearing structure 10 is driven to rotate, and the ball bearing structure 10 drives the steering shaft 21 to move along its axial direction without rotating. Figure 1 In the figure, for the sake of simplicity, the connection components such as screws and screw sleeves between the motor 22 and the ball bearing structure 10 are not shown, and the present invention is not limited to the above embodiment. For example, in other embodiments, a suitable type of driving source such as an external rotation motor, an internal rotation motor, or a belt motor can be selected as the motor, and the connection between the motor and the ball bearing structure or the motor and the steering shaft can also be configured according to actual conditions.

[0029] Specifically, Figure 1 and Figure 2As shown, in the ball screw dual motor power steering machine 1 of the present invention, the ball screw dual motor power steering machine 1 includes two controllers 24, which are electrically connected to the two motors 22, and the two controllers 24 are electrically connected to each other. Among them, the two motors 22 respectively arranged on both sides of the ball bearing structure 10 can be respectively referred to as the first motor 22 and the second motor 22, and the ball screw dual motor power steering machine 1 includes two controllers 24, namely the first controller 24 and the second controller 24. Among them, the first controller 24 is electrically connected to the first motor 22, and the second controller 24 is electrically connected to the second motor 22, and the two controllers 24 are electrically connected to each other. Through this configuration, when any controller 24 detects that the motor 22 controlled by it is abnormal, this controller 24 can shut down the abnormal motor 22 in time, and can transmit a signal to the other controller 24, so that the other controller 24 starts the motor 22 that is not abnormal to continue to operate, so that when one of the motors 22 is abnormal, the ball screw dual motor power steering machine 1 as a whole can still operate normally.

[0030] Furthermore, if Figure 3 As shown, in this embodiment, a portion of the steering shaft 21 is a screw portion 211 having a threaded groove, and the other portion is a tooth row portion 212 having a tooth row, wherein the screw portion 211 has a circular cross-section shape, and the tooth row portion 212 has a rectangular cross-section shape.

[0031] In addition, if Figure 4 As shown, the ball screw dual-motor power steering machine 1 further includes a worm gear 23, which is meshed with the tooth row portion 212 of the steering shaft 21. When the motor 22 drives the steering shaft 21 to move back and forth, the tooth row portion 212 of the steering shaft 21 can push the worm gear 23, so that the worm gear 23 can be used as an output rod to connect other mechanical components for further application.

[0032] In addition, the ball screw dual motor power steering machine 1 may include a support member 213, which is arranged on one side of the tooth row portion 212, and the support member 213 has a rectangular groove that matches the tooth row portion 212, and the rectangular groove of the support member 213 accommodates the tooth row portion 212, and the other side thereof abuts against the housing. Through this configuration, when the ball screw dual motor power steering machine 1 works to displace the steering shaft 21 along its axial direction, the support member 213 can provide support for the tooth row portion 212 to reduce the deviation of the steering shaft 21 when it moves, thereby facilitating the improvement of the precision of the screw drive device ball screw dual motor power steering machine 1 and reducing the probability of component damage. In this embodiment, the support member 213 is made of copper material.

[0033] Furthermore, the ball screw dual motor power steering machine 1 includes a first housing 25 and a second housing 25, which are respectively connected tubular structures, and one end of the first housing 25 and the second housing 25 are respectively locked to the two sides of the support flange 141 of the ball bearing structure 10. Among them, the ball bearing structure 10, the steering shaft 21, the two motors 22, the worm 23, and the two controllers 24 are all accommodated in the accommodation space formed by the first housing 25 and the second housing 25, and the two ends of the steering shaft 21 extend from the first housing 25 and the second housing 25 respectively.

[0034] It is worth noting that, in the case where the ball screw dual motor power steering machine 1 of the present invention is required to provide a large torque, the ball screw dual motor power steering machine 1 can further include a planetary reduction mechanism, which is arranged between the motor 22 and the ball bearing structure 10, to reduce the speed of the motor 22 and increase the torque of the motor 22. Specifically, the planetary reduction mechanism includes: a driving gear member, which is arranged on one end of the motor rotor 223; a plurality of reduction gear members, which are arranged on one side of the ball bearing structure 10 and meshed with the driving gear member; an internal gear member, which is sleeved on a plurality of reduction gear members, and the inner side of the internal gear member is meshed with a plurality of reduction gear members, and the outer ring surface of the internal gear member is provided with a flange portion, and the flange portion is provided with a plurality of locking holes. Among them, the internal gear member is combined with the ball bearing structure 10 through a plurality of locking holes. In the case of a planetary reduction mechanism, when one of the two motors 22 is working, the motor 22 can drive the ball bearing structure 10 to rotate via the planetary reduction mechanism, and the ball bearing structure 10 drives the steering shaft 21 to move along its axial direction.

[0035] In the embodiment, only a single motor 22 may be provided with a planetary reduction mechanism, but the present invention is not limited thereto. In the case where motors 22 are provided on both sides of the ball bearing structure 10, planetary reduction mechanisms may be provided between the two motors 22 and the ball bearing structure 10, or the planetary reduction mechanism may be omitted. In other words, the number of planetary reduction mechanisms may be arbitrarily configured according to user needs or cost considerations.

[0036] See also Figures 5 to 7D , Figure 5 A schematic diagram of a ball bearing structure of a ball screw dual-motor power steering machine according to an embodiment of the present invention; Figure 6 is a schematic diagram of the internal structure of the ball bearing structure of the ball screw dual-motor power steering machine according to an embodiment of the present invention; and 7A to 7D Schematic diagram of a ball circulator of a ball bearing structure of a ball screw dual-motor power steering machine according to an embodiment of the present invention.

[0037] like Figure 5 and Figure 6As shown, the present invention provides a ball bearing structure 10, which includes: an inner ring member 11, which is sleeved on the screw portion 211 of the steering shaft 21, the inner ring member 11 is provided with a plurality of locking holes 111, and a plurality of first ball members 12 are provided between the inner ring member 11 and the screw portion 211; two inner ring spacers 13, which are arranged on both sides of the inner ring member 11; an outer ring member 14, which is sleeved on the inner ring member 11, the outer ring surface of the outer ring member 14 is provided with a supporting flange 141, and the supporting flange 141 is provided with a plurality of locking holes 1411, and a plurality of second ball members 15 are provided between the inner ring member 11 and the outer ring member 14; and two ball circulators 16, which are arranged in the inner ring member 11.

[0038] Specifically, 7A to 7D As shown, Fig. 7A is a schematic diagram of the appearance of the ball circulator 16; Figure 7B is a top view of the ball circulator 16, which mainly shows the shape of the guide groove 1621 of the ball circulator 16; Figure 7C is a side view of the ball circulator 16, which mainly shows the shape of the fixing portion 163 of the ball circulator 16; Fig.7D It is another side view of the ball circulator 16 , which mainly shows the shape of the guide groove 1621 and the threaded portion 161 of the ball guide 16 .

[0039] The two ball circulators 16 respectively include: a threaded portion 161, which is arranged on one side of the ball circulator 16 and has a groove corresponding to the screw portion 211 and is embedded in the screw portion 211; a guide portion 162, which is arranged on the other side of the ball circulator 16 relative to the threaded portion 161 and has an arc-shaped guide groove 1621; a fixing portion 163, which is arranged on one side between the threaded portion 161 and the guide portion 162 of the ball circulator 16, and the fixing portion 163 is fixed to the inner ring spacer 13 on one side of the inner ring member 11. The two guide grooves 1621 of the two ball circulators 16 and the spiral groove of the screw portion 211 of the steering shaft 21 together constitute the return path of the plurality of first ball members 12.

[0040] Return to reference Figure 6 As shown, the two ports of the guide groove 1621 of the guide portion 162 of the ball circulator 16 extend in directions perpendicular to each other, and the port of the guide groove 1621 of the ball circulator 16 corresponds to the port of the guide groove 1621 of another ball circulator 16, so that a plurality of first ball components 12, such as balls, can circulate along the guide grooves 1621 of the two ball circulators 16 and the spiral groove structure of the screw portion 211 of the steering shaft 21, thereby forming a return path for a plurality of first ball components 12.

[0041] In addition, in this embodiment, the fixing portion 163 of the ball circulator 16 has a fixing protrusion 1631 protruding along the planar extension direction of the fixing portion 163, and the fixing protrusion 1631 is flat-plate-shaped to fit the inner ring spacer 13, so that the ball circulator 16 can be more firmly fixed on the inner ring spacer 13.

[0042] Furthermore, if Figure 7B As shown, the guide groove 1621 of the guide portion 162 is in an arc shape, and the curvature radius of the guide groove 1621 can be configured according to the size of the plurality of first ball members 12. For example, the plurality of first ball members 12 have a ball diameter d, and the guide groove 1621 of the guide portion 162 of the ball circulator 16 has a guide curvature radius R, and the guide curvature radius R can be set to twice the ball diameter d, that is, R=2d. Through this configuration, the resistance of the plurality of first ball members 12 when passing through the guide groove 1621 can be effectively reduced, which is conducive to reducing the noise, vibration and reflux irregularities during the reflux process of the first ball members 12.

[0043] In the ball bearing structure 10 of the present invention, since the ball circulator 16 can be independently mass-produced and subsequently installed in the ball bearing structure 10, ball circulators 16 with different specifications can be produced according to actual needs, and production parameters can be adjusted according to the specifications of each ball circulator 16, thereby reducing the error of the guide groove 1621 of the ball circulator 16 and reducing the production cost of forming a reflux channel.

[0044] In addition, the ball screw dual motor power steering machine 1 may include a support member 213, which is arranged on one side of the tooth row portion 212, and the support member 213 has a rectangular groove that matches the tooth row portion 212, and the rectangular groove of the support member 213 accommodates the tooth row portion 212, and the other side thereof abuts against the housing. Through this configuration, when the ball screw dual motor power steering machine 1 works to displace the steering shaft 21 along its axial direction, the support member 213 can provide support for the tooth row portion 212 to reduce the deviation of the steering shaft 21 when it moves, thereby facilitating the improvement of the precision of the ball screw dual motor power steering machine 1 and reducing the probability of component damage. In this embodiment, the support member 213 is made of copper material.

[0045] In summary, the present invention provides a ball screw dual motor power steering machine, wherein the ball bearing structure of the ball screw dual motor power steering machine has an independently arranged ball circulator. Compared with the usual bearing sleeves that are ground to form ball grooves, the ball circulator of the ball bearing structure of the present invention can be independently mass-produced and subsequently installed in the ball bearing structure, thereby reducing the error of the guide groove during the production process of the ball circulator, and reducing the manufacturing cost of forming a reflux channel, effectively avoiding noise, vibration, and reflux problems, which is conducive to improving processing precision. In addition, the guide curvature radius of the guide groove of the ball circulator of the ball bearing structure of the present invention is set to twice the ball diameter of the ball member, thereby further avoiding noise, vibration, and reflux problems that may occur during the reflux process.

[0046] In addition, the ball screw dual motor power steering machine of the present invention is provided with motors on both sides of its ball bearing structure, so as to cooperate with each controller to drive the work of the ball screw dual motor power steering machine through the dual motor structure. Through this configuration, when any one of the controllers detects that an abnormality occurs in the motor, the controller can shut down the abnormal motor in real time, and the other controller can start the normal motor to continue operation, so that in the event of an abnormality, the ball screw dual motor power steering machine as a whole can still operate normally, thereby improving the operating efficiency of the motor and reducing the dangers that may be caused by equipment abnormality.

[0047] The above contents are only exemplary and not restrictive. Any equivalent modification or change made to the present invention without departing from the spirit and scope of the present invention shall be included in the scope of the claims.

Claims

1. A ball screw dual motor power steering machine, comprising: A steering shaft, comprising a screw portion and a gear row portion; A ball bearing structure, sleeved on the screw portion of the steering shaft; Two motors are respectively arranged on both sides of the ball bearing structure, the two motors respectively include a motor rotor and a motor stator, the motor rotor and the motor stator are respectively hollow, and the steering shaft is passed through the hollow part thereof, and the motor rotor is locked to the ball bearing structure; Two shells are connected tubular structures, and one end of each of the two shells is locked to the two sides of the ball bearing structure, and the two shells contain the steering shaft, the ball bearing structure, and the motor; as well as Two controllers are disposed on the two housings and are electrically connected to the two motors respectively, and the two controllers are electrically connected to each other; Wherein, one of the two motors drives the motor rotor to drive the ball bearing structure to rotate, and the ball bearing structure drives the steering shaft to move along its axial direction.

2. The ball screw dual-motor power steering machine according to claim 1, wherein the screw portion has a circular cross-section shape, and the tooth row portion has a rectangular cross-section shape; in, The ball screw dual-motor power steering machine further includes a support member, which is arranged on one side of the tooth row portion, and the support member has a rectangular groove that matches the tooth row portion.

3. The ball screw dual motor power steering machine according to claim 1, wherein the ball bearing structure comprises: An inner ring member is sleeved on the screw portion of the steering shaft, and a plurality of first ball members are provided between the inner ring member and the screw portion, and two sides of the inner ring member are respectively engaged with the motor rotors of the two motors; An outer ring member is sleeved on the inner ring member, and a plurality of second ball members are provided between the inner ring member and the outer ring member; as well as Two ball circulators are arranged in the inner ring, and the two ball circulators respectively include: A threaded portion, disposed on one side of the ball circulator, having a groove corresponding to the screw portion and embedded in the screw portion; a guide portion, which is arranged on the other side of the ball circulator relative to the threaded portion and has an arc-shaped guide groove; and The fixing portion is arranged at one side between the threaded portion and the guide portion of the ball circulator, and the fixing portion is fixed to the inner ring member.

4. The ball screw dual-motor power steering machine according to claim 3, wherein the first ball member has a ball diameter, the guide groove of the ball circulator has a guide curvature radius, and the guide curvature radius is twice the ball diameter.

5. The ball screw dual-motor power steering machine according to claim 1, comprising a planetary reduction mechanism disposed between one of the two motors and the ball bearing structure, the planetary reduction mechanism comprising: A driving gear member, disposed at one end of the motor rotor; a plurality of reduction gear members disposed on one side of the ball bearing structure and meshed with the driving gear member; An internal gear member is sleeved on the plurality of reduction gear members, and the inner side of the internal gear member is meshed with the plurality of reduction gear members, the outer ring surface of the internal gear member is provided with a flange portion, and the flange portion is provided with a plurality of locking holes; Wherein, the internal gear is combined with the ball bearing structure through the multiple locking holes, and one of the two motors drives the ball bearing structure to rotate via the planetary reduction mechanism, and the ball bearing structure drives the steering shaft to move along its axial direction.

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