Anti-failure device of steer-by-wire vehicle

Abstract

The utility model discloses an anti-failure device of a steer-by-wire vehicle, a first screw rod and a second screw rod are respectively connected with wheels, when a first driving assembly and a second driving assembly work normally, the first driving assembly drives the first screw rod to move axially and controls the wheels connected with the first screw rod to steer, and the wheels are driven by the second driving assembly to steer. The second driving assembly drives the second lead screw to move axially and controls the wheels connected with the second lead screw to steer, the first driving assembly and the second driving assembly work independently, and when the first driving assembly or the second driving assembly loses efficacy, for example, the first driving assembly loses efficacy, the wheels are driven to steer. The second driving assembly drives the second transmission assembly to be matched with the first transmission assembly, so that the first transmission assembly drives the first nut to rotate, the first nut drives the first lead screw to move axially, then the wheels connected with the first lead screw are steered, and it is ensured that under the condition that one of the driving assemblies fails, the wheels are driven to rotate. The other driving assembly can achieve double-side power assisting, and extra motor backup does not need to be added.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of wire control vehicle, specifically relates to the anti -failure device of wire control steering vehicle. BACKGROUND

[0002] The distributed drive electric automobile directly installs motor in or near the drive wheel, and the engine is replaced by the battery, and after removing the traditional power transmission system, the vehicle has higher transmission efficiency and more compact structure; in addition, the motor of the distributed drive electric automobile can be controlled individually, and the control mode is more flexible, but when one side drive motor fails, additional yawing torque is generated, which easily causes the vehicle to seriously deviate, and there is a great safety hazard, and at the turning place, the wheel hub speed of the two wheel hubs of the front or rear wheel is not coordinated due to the failure of the drive motor on one side, so that the problem of power cycle imbalance or automobile cannot normally run caused by one side wheel dragging or turning is easily generated. In the prior art, double motors are provided as a backup for motor failure, but this scheme greatly increases the system cost and volume, and cannot fully play the advantages of wire control steering. SUMMARY

[0003] In view of the technical problem that the prior art sets double motors as a backup for motor failure, resulting in increased system cost and volume, the utility model provides an anti-failure device for a wire control steering vehicle, which ensures that the other drive assembly can realize double-side assistance in the case of failure of one of the drive assemblies, without the need for additional motor backup.

[0004] The technical scheme adopted by the utility model is as follows: an anti-failure device for a wire control steering vehicle, comprising a first screw rod, a second screw rod, a first drive assembly for driving the first screw rod to move axially, a first nut sleeved on the outer peripheral wall of the first screw rod, a second drive assembly for driving the second screw rod to move axially, and a second nut sleeved on the outer peripheral wall of the second screw rod, wherein the first screw rod and the second screw rod have a gap therebetween, the first nut is provided with a first transmission assembly which slides, the second nut is provided with a second transmission assembly which is connected with the second drive assembly, and the second transmission assembly is in movable cooperation with the first transmission assembly under the driving of the second drive assembly.

[0005] Optionally, the first transmission assembly comprises a first magnetic guide piece, a spring and a fixed nut, one end of the first nut is provided with a first bearing, the other end of the first nut is provided with the fixed nut, the first magnetic guide piece is located between the first bearing and the fixed nut in a sliding manner, one end of the spring is connected with the first magnetic guide piece, and the other end of the spring is connected with the fixed nut.

[0006] Optionally, the second transmission assembly comprises a second magnetic guide, a second friction plate, a coil and a wire harness, one end of the second nut is provided with a second bearing, the other end of the second nut is fixedly connected with the second friction plate, the second magnetic guide is fixedly connected with the outer ring of the second bearing, the second friction plate extends between the first magnetic guide and the second magnetic guide, the coil is wound on the outer peripheral wall of the second magnetic guide, one end of the wire harness is connected with the coil, and the other end of the wire harness is connected with the first driving assembly and the second driving assembly respectively.

[0007] Optionally, the outer peripheral wall of the first nut is provided with external splines, the inner peripheral wall of the first magnetic guide is provided with internal splines in sliding fit with the external splines, and the length of the internal splines is less than the length of the external splines.

[0008] Optionally, the first driving assembly comprises a first motor, a first worm, a first worm wheel and a first gear shaft, one end of the first worm is connected with the first motor, the other end of the first worm is engaged with the first worm wheel, the first worm wheel is coaxially connected with the first gear shaft, and the first gear shaft is engaged with the first lead screw; the second driving assembly comprises a second motor, a second worm, a second worm wheel and a second gear shaft, one end of the second worm is connected with the second motor, the other end of the second worm is engaged with the second worm wheel, the second worm wheel is coaxially connected with the second gear shaft, and the second gear shaft is engaged with the second lead screw, and the wire harness is connected with the first motor and the second motor respectively.

[0009] Optionally, the first lead screw is provided with a first rack in the axial direction, the first gear shaft is engaged with the first rack for transmission, the second lead screw is provided with a second rack in the axial direction, and the second gear shaft is engaged with the second rack for transmission.

[0010] Optionally, the first magnetic guide is provided with a first friction plate on the side facing the second magnetic guide, and the first friction plate is in movable abutment with the second friction plate.

[0011] Optionally, the second friction plate comprises a first connecting portion and a second connecting portion, the first connecting portion is fixedly connected with the second nut, one end of the second connecting portion is angularly connected with the first connecting portion, and the other end of the second connecting portion extends to the end portion of the second magnetic guide.

[0012] The utility model discloses the beneficial effect is: first screw rod and second screw rod are connected with the wheel respectively, when first drive assembly and second drive assembly are all normal work, first drive assembly drives first screw rod axial movement, control and the steering of wheel connected with first screw rod, second drive assembly drives second screw rod axial movement, control and the steering of wheel connected with second screw rod, first drive assembly and second drive assembly work independently, when first drive assembly or second drive assembly fails, for example, first drive assembly fails, second drive assembly drives second transmission assembly and first transmission assembly cooperation, makes first transmission assembly drive first nut rotation, and first nut drives first screw rod axial movement, further realizes the steering of wheel connected with first screw rod, ensures under the condition that one of drive assembly fails, the other drive assembly can realize bilateral power assistance, need not extra increase motor backup. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 The structure diagram of the anti-failure device of the by-wire steering vehicle is provided for the utility model embodiment.

[0014] Fig. 2 The sectional view of the anti-failure device of the by-wire steering vehicle is provided for the utility model embodiment.

[0015] Fig. 3 The schematic diagram of the spring of the anti-failure device of the by-wire steering vehicle is provided for the utility model embodiment.

[0016] The mark in each drawing is: 1, first screw rod;2, second screw rod;3, first nut;4, second nut;5, first magnetic guide;6, spring;7, fixed nut;8, first bearing;9, second magnetic guide;10, second friction plate;11, coil;12, wire harness;13, second bearing;14, first motor;15, first worm;16, first worm wheel;17, first gear shaft;18, second motor;19, second worm;20, second worm wheel;21, second gear shaft;22, first rack;23, second rack;24, first friction plate;25, first connecting portion;26, second connecting portion. DETAILED DESCRIPTION

[0017] The application will be further described in detail below in combination with the drawings and embodiments.

[0018] As Figs. 1 to 3As shown, the embodiment discloses a kind of failure prevention devices of steer-by-wire vehicle, including first screw rod 1, second screw rod 2, the first driving assembly of driving first screw rod 1 axial movement, first nut 3 being sleeved on the outer peripheral wall of first screw rod 1, the second driving assembly of driving second screw rod 2 axial movement, second nut 4 being sleeved on the outer peripheral wall of second screw rod 2, the gap between the first screw rod 1 and second screw rod 2, first transmission assembly is slidably arranged in first nut 3, second nut 4 is equipped with the second transmission assembly connected with the second driving assembly, the second transmission assembly is driven with the first transmission assembly by the second driving assembly, first screw rod 1 and second screw rod 2 are connected with wheel respectively, when first driving assembly and second driving assembly are all normal work, first driving assembly drives first screw rod 1 axial movement, control and the steering of wheel connected with first screw rod 1, second driving assembly drives second screw rod 2 axial movement, control and the steering of wheel connected with second screw rod 2, first driving assembly and second driving assembly are independently worked, when first driving assembly or second driving assembly fails, for example, first driving assembly fails, second driving assembly drives second transmission assembly and first transmission assembly, so that first transmission assembly drives first nut rotation, first nut drives first screw rod 1 axial movement, in turn realize the steering of wheel connected with first screw rod 1, ensure that in the case where one of driving assembly fails, the other driving assembly can realize bilateral power assistance, without additional increase motor backup.

[0019] As Fig. 2As shown, the first transmission assembly includes a first magnetic guide 5, a spring 6 and a fixed nut 7, the first nut 3 has a first bearing 8 at one end and the fixed nut 7 at the other end, the first magnetic guide 5 is located between the first bearing 8 and the fixed nut 7, the spring 6 has one end connected with the first magnetic guide 5 and the other end connected with the fixed nut 7. The second transmission assembly includes a second magnetic guide 9, a second friction plate 10, a coil 11 and a wire harness 12, the second nut 4 has a second bearing 13 at one end and the second friction plate 10 at the other end, the second magnetic guide is fixedly connected with the outer ring of the second bearing 13, the second friction plate 10 extends between the first magnetic guide 5 and the second magnetic guide 9, the coil 11 is wound on the outer peripheral wall of the second magnetic guide 9, one end of the wire harness 12 is connected with the coil 11, and the other end of the wire harness 12 is connected with the first drive assembly and the second drive assembly respectively. When the coil 11 is powered, the second magnetic guide 9 generates a magnetic field, the first magnetic guide 5 moves towards the second magnetic guide 9, and the elastic member is compressed under stress. When the coil 11 is powered off, the first magnetic guide 5 moves away from the second magnetic guide 9 under the action of the restoring force of the spring 6, so that the first magnetic guide 5 and the second magnetic guide 9 are quickly separated. In the embodiment, the first magnetic guide 5 is a ferrite or a neodymium iron, and the second magnetic guide 9 is an iron core. The outer peripheral wall of the first nut is provided with an external spline, the inner peripheral wall of the first magnetic guide 5 is provided with an internal spline in sliding fit with the external spline, and the length of the internal spline is less than the length of the external spline. The cooperation of the internal spline and the external spline makes the first magnetic guide 5 move only in the axial direction of the first nut, avoiding the radial movement of the first magnetic guide 5. The external spline and the internal spline can simultaneously transmit the torque of the knob, so that the first magnetic guide 5 drives the first nut 3 to rotate together.

[0020] In the embodiment, as shown in Fig. 1As shown, the first drive assembly includes a first motor 14, a first worm 15, a first worm gear 16 and a first gear shaft 17, one end of the first worm 15 is connected with the first motor 14, the other end of the first worm 15 is engaged with the first worm gear 16, the first worm gear 16 is coaxially connected with the first gear shaft 17, the first gear shaft 17 is engaged with the first lead screw 1; the second drive assembly includes a second motor 18, a second worm 19, a second worm gear 20 and a second gear shaft 21, one end of the second worm 19 is connected with the second motor 18, the other end of the second worm 19 is engaged with the second worm gear 20, the second worm gear 20 is coaxially connected with the second gear shaft 21, the second gear shaft 21 is engaged with the second lead screw 2, the wire harness 12 is connected with the first motor 14 and the second motor 18 respectively. The first motor 14 drives the first worm gear 16 to rotate through the first worm 15, the first worm gear 16 drives the first lead screw 1 to move axially through the first gear shaft 17, the second motor 18 drives the second worm gear 20 to rotate through the second worm 19, the second worm gear 20 drives the second lead screw 2 to move axially through the second gear shaft 21, the inner circulating raceway for the rolling of the ball is arranged between the first lead screw 1 and the first nut and between the second lead screw 2 and the second nut 4, so that the first lead screw 1 drives the first nut to rotate and the second lead screw 2 drives the second nut 4 to rotate. The control system is integrated in the first motor 14 and the second motor 18, when the first motor 14 fails, the second motor 18 energizes the coil 11 through the wire harness 12, when the second motor 18 fails, the first motor 14 energizes the coil 11 through the wire harness 12. The first lead screw 1 is provided with a first rack 22 along the axial direction, the first gear shaft 17 is engaged with the first rack 22 for transmission, the second lead screw 2 is provided with a second rack 23 along the axial direction, the second gear shaft 21 is engaged with the second rack 23 for transmission.

[0021] As Fig. 3As shown, the first magnetic member 5 is provided with a first friction plate 24 on the side facing the second magnetic member 9, and the first friction plate 24 is in movable abutment with the second friction plate 10. When the coil 11 on the second magnetic member 9 is energized, the second magnetic member 9 generates a magnetic field, and the first friction plate 24 and the second friction plate 10 are both non-metallic members, the magnetic field is adsorbed by the first friction plate 24 and the second friction plate 10 to the first magnetic member 5, and the torque of the second nut 4 is transmitted to the first nut through the first friction plate 24 and the second friction plate 10. The second friction plate 10 includes a first connecting portion 25 and a second connecting portion 26, the first connecting portion 25 is fixedly connected with the second nut 4, and the second connecting portion 26 is angularly connected with the first connecting portion 25 at one end, and the other end of the second connecting portion 26 extends to the end of the second magnetic member 9. Here, the end of the second magnetic member 9 refers to the end of the second magnetic member 9 away from the second bearing 13, and the second connecting portion 26 is integrally formed with the first connecting portion 25 and is arranged vertically, and the second connecting portion 26 can also be located between the first friction plate 24 and the second magnetic member 9, the first friction plate 24 and the second friction plate 10 are both non-metallic materials, and the magnetic field of the second magnetic member 9 can directly act on the first magnetic member 5 through the first friction plate 24 and the second friction plate 10.

[0022] It can be understood that the specific embodiments described above are only used to explain the related utility model, and are not limited to the utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the utility model are shown in the drawings. The technical solutions in the same embodiment and the technical solutions in different embodiments can be arranged and combined to form new technical solutions without contradiction or conflict. Any equivalent structural transformation, direct or indirect application in other related technical fields, is also included in the protection scope of the utility model.

Claims

1. A fail-safe device for a steer-by-wire vehicle, characterized by, The first screw rod, the second screw rod, the first driving assembly driving the first screw rod to move axially, the first nut sleeved on the outer wall of the first screw rod, the second driving assembly driving the second screw rod to move axially, and the second nut sleeved on the outer wall of the second screw rod are provided.

2. The fail-safe device for a steer-by-wire vehicle according to claim 1, characterized by, The first driving assembly includes a first magnetic guide, a spring and a fixed nut, one end of the first nut is provided with a first bearing, the other end of the first nut is provided with the fixed nut, the first magnetic guide is located between the first bearing and the fixed nut, one end of the spring is connected with the first magnetic guide, and the other end of the spring is connected with the fixed nut.

3. The fail-safe device for a steer-by-wire vehicle according to claim 2, characterized by, The second driving assembly includes a second magnetic guide, a second friction plate, a coil and a wire harness, one end of the second nut is provided with a second bearing, the other end of the second nut is fixedly connected with the second friction plate, the second magnetic guide is fixedly connected with the outer ring of the second bearing, the second friction plate extends between the first magnetic guide and the second magnetic guide, the coil is wound on the outer wall of the second magnetic guide, one end of the wire harness is connected with the coil, and the other end of the wire harness is connected with the first driving assembly and the second driving assembly respectively.

4. The fail-safe device for a steer-by-wire vehicle according to claim 2, characterized by The outer wall of the first nut is provided with external splines, the inner wall of the first magnetic guide is provided with internal splines in sliding fit with the external splines, and the length of the internal splines is less than that of the external splines.

5. The fail-safe device for a steer-by-wire vehicle according to claim 3, characterized by The first driving assembly includes a first motor, a first worm, a first worm wheel and a first gear shaft, one end of the first worm is connected with the first motor, the other end of the first worm is engaged with the first worm wheel, the first worm wheel is coaxially connected with the first gear shaft, and the first gear shaft is engaged with the first screw rod; the second driving assembly includes a second motor, a second worm, a second worm wheel and a second gear shaft, one end of the second worm is connected with the second motor, the other end of the second worm is engaged with the second worm wheel, the second worm wheel is coaxially connected with the second gear shaft, and the second gear shaft is engaged with the second screw rod, and the wire harness is connected with the first motor and the second motor respectively.

6. The fail-safe device for a steer-by-wire vehicle according to claim 5, characterized by The first screw rod is provided with a first rack in the axial direction, the first gear shaft is engaged with the first rack for transmission, the second screw rod is provided with a second rack in the axial direction, and the second gear shaft is engaged with the second rack for transmission.

7. The fail-safe device for a steer-by-wire vehicle according to claim 3, characterized by The first magnetic guide is provided with a first friction plate on the side facing the second magnetic guide, and the first friction plate is in movable abutment with the second friction plate.

8. The fail-safe device for a steer-by-wire vehicle according to claim 3, characterized by The second friction plate includes a first connecting portion and a second connecting portion, the first connecting portion is fixedly connected with the second nut, and one end of the second connecting portion is angularly connected with the first connecting portion. The other end of the second connecting portion extends to the end of the second magnetic guide.

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