Steering driving structure, steering gear, steering system and vehicle

Abstract

The utility model relates to a steering driving structure, a steering gear, a steering system and a vehicle. The steering driving structure comprises a first driving mechanism, a second driving mechanism and a ball screw mechanism, and the first driving mechanism comprises a first motor and a first speed reduction unit; the second driving mechanism comprises a second motor and a second speed reduction unit; the ball screw mechanism is used for being connected with a steering rod, and the first speed reduction unit and the second speed reduction unit are connected with the ball screw mechanism. The steering driving structure is provided with the two driving mechanisms, that is, the ball screw mechanism can be jointly driven by the first motor and the second motor to drive the steering rod to rotate, or after one driving mechanism fails, the other driving mechanism can be used for executing steering work, and the stability and reliability of the driving mechanisms are guaranteed; in addition, the ball screw mechanism drives the lead screw to move in a rolling friction mode, the transmission efficiency and the bearing capacity of the driving structure can be improved, and abrasion and noise during transmission are reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of steering gears, and in particular to a steering drive structure, a steering gear, a steering system and a vehicle. Background Art

[0002] The steering gear is a transmission component used for vehicle steering. Currently, most steering gears use a single motor and a worm gear or gear meshing to drive the vehicle to steer. This transmission method has low transmission efficiency and poor stability. Utility Model Content

[0003] The purpose of the present disclosure is to provide a steering drive structure, a steering gear, a steering system and a vehicle to improve the efficiency and stability of transmission, thereby at least partially solving the above technical problems.

[0004] In order to achieve the above-mentioned objectives, the first aspect of the present disclosure provides a steering drive structure, including: a first drive mechanism, including a first motor and a first reduction unit; a second drive mechanism, including a second motor and a second reduction unit; and a ball screw mechanism, which is used to connect to a steering rod, and the first reduction unit and the second reduction unit are respectively connected to the ball screw mechanism; the first motor can drive the steering rod to move through the first reduction unit and the ball screw mechanism; the second motor can drive the steering rod to move through the second reduction unit and the ball screw mechanism.

[0005] Optionally, the ball screw mechanism includes a screw connected to the steering rod and a first ball nut and a second ball nut threadedly connected to the screw, the first ball nut is connected to the first reduction unit, and the second ball nut is connected to the second reduction unit.

[0006] Optionally, the lead screw includes a first lead screw and a second lead screw having opposite rotation directions and being detachably connected, and the first ball nut and the second ball nut are threadedly connected to the first lead screw and the second lead screw, respectively.

[0007] Optionally, the first reduction unit and the second reduction unit each include a driving wheel and a driven wheel, the driving wheel is used to be connected to the output ends of the first motor and the second motor, and the driving wheel is transmission-connected to the driven wheel via a transmission member.

[0008] Optionally, the transmission member is configured as a synchronous belt, and the synchronous belt is wound around a portion of the outer circumference of the driving wheel and the driven wheel.

[0009] Optionally, the driven wheel is used to be connected to the first ball nut and the second ball nut via fasteners.

[0010] Optionally, the first ball nut and the second ball nut are both connected to the steering gear housing via mounting bearings.

[0011] Optionally, both the first motor and the second motor are connected to a controller.

[0012] According to a second aspect of the present disclosure, a steering gear is provided, comprising a steering rod and the above-mentioned steering drive structure, wherein the steering rod is connected to the ball screw mechanism.

[0013] A third aspect of the present disclosure provides a steering system comprising the above-mentioned steering gear.

[0014] A fourth aspect of the present disclosure provides a vehicle comprising the above-mentioned steering system.

[0015] Through the above technical scheme, the steering drive structure disclosed in the present invention has two sets of driving mechanisms, that is, the ball screw mechanism can be driven by the first motor and the second motor to drive the steering rod to rotate, or, after one of the driving mechanisms fails, the other set of driving mechanisms can be used to perform the steering work to ensure the stability and reliability of the driving mechanism; in addition, the ball screw mechanism drives the screw to move by rolling friction, which can improve the transmission efficiency and load-bearing capacity of the driving structure and reduce wear and noise during transmission.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 is a cross-sectional view of a steering drive structure provided by an embodiment of the present disclosure;

[0019] Figure 2 is an exploded diagram of a second driving mechanism and a ball screw structure provided in an embodiment of the present disclosure;

[0020] Figure 3 is an assembly diagram of a second driving mechanism and a ball screw structure provided in an embodiment of the present disclosure;

[0021] Figure 4 It is a structural diagram of the ball screw structure provided in an embodiment of the present disclosure.

[0022] Description of Reference Numerals

[0023] 1-first driving mechanism; 2-first motor; 3-first reduction unit; 4-second driving mechanism; 5-second motor; 6-second reduction unit; 7-ball screw mechanism; 71-screw; 711-first screw; 712-second screw; 72-first ball nut; 73-second ball nut; 8-driving wheel; 9-driven wheel; 10-transmission member; 11-synchronous belt; 12-mounting bearing; 13-controller; 14-steering rod; 15-steering gear housing. DETAILED DESCRIPTION

[0024] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0025] In the present disclosure, unless otherwise specified, directional words such as "inside" and "outside" refer to "inside" and "outside" relative to the corresponding component's own outline. In addition, the terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be understood as limitations on the present disclosure.

[0026] The steering drive structure in an exemplary embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0027] refer to Figures 1 to 4As shown, in the first aspect of the present disclosure, a steering drive structure is provided, including a first drive mechanism 1, a second drive mechanism 4 and a ball screw mechanism 7, wherein the first drive mechanism 1 includes a first motor 2 and a first reduction unit 3; the second drive mechanism 4 includes a second motor 5 and a second reduction unit 6; the ball screw mechanism 7 is used to connect with the steering rod 14, and the first reduction unit 3 and the second reduction unit 6 are respectively connected with the ball screw mechanism 7; the first motor 2 can drive the steering rod 14 to move through the first reduction unit 3 and the ball screw mechanism 7; at the same time, the second motor 5 can drive the steering rod 14 to move through the second reduction unit 6 and the ball screw mechanism 7. The steering drive structure disclosed in the present invention has two sets of drive mechanisms, which can be symmetrically arranged about the center of the ball screw mechanism 7 and can be connected to the ball screw mechanism 7 separately to drive the steering rod 14 to move. Based on this, the steering drive structure can have multiple working modes. For example, the first drive mechanism 1 and the second drive mechanism 4 can work together to drive the steering rod 14 to move, so that the first drive mechanism 1 and the second drive mechanism 4 can respectively bear 50% of the steering load, thereby facilitating the movement of the steering rod 14 to complete the steering work, improving the maneuverability and reducing the loss of the two drive mechanisms; or, one of the first drive mechanism 1 and the second drive mechanism 4 drives the steering rod 14 to move, so that even if one of the two drive mechanisms fails, the other drive mechanism can bear 100% of the steering load to complete the steering work, thereby improving the stability and reliability of the steering drive structure. In addition, the ball screw mechanism 7 drives the screw 71 to move by rolling friction, which can improve the transmission efficiency and load-bearing capacity of the drive structure and reduce wear and noise during transmission.

[0028] In some embodiments of the present disclosure, Figure 1 and Figure 4 As shown, the ball screw mechanism 7 includes a screw 71 connected to the steering rod 14 and a first ball nut 72 and a second ball nut 73 threadedly connected to the screw 71, the first ball nut 72 is connected to the first reduction unit 3, and the second ball nut 73 is connected to the second reduction unit 6. That is, two ball nuts are arranged on the screw 71 of the ball screw mechanism 7, so that the ball screw mechanism 7 is respectively connected to the first reduction unit 3 and the second reduction unit 6, and there is no need to arrange another set of ball screw mechanisms 7 connected to the steering rod 14, so that when the first reduction unit 3 and the second reduction unit 6 drive the first ball nut 72 and the second ball nut 73 to rotate, the screw 71 is driven to move.

[0029] Among them, Figure 1As shown, in order to facilitate the installation of the first ball nut 72 and the second ball nut 73, the screw 71 may include a first screw 711 and a second screw 712 with opposite rotation directions and detachably connected. The first ball nut 72 and the second ball nut 73 are respectively threadedly connected to the first screw 711 and the second screw 712. The first screw 711 and the second screw 712 can be connected together by, for example, a threaded connection. When installing the ball nuts, the first screw 711 and the second screw 712 are separated so that the first ball nut 72 can be inserted from both ends of the first screw 711, and the second ball nut 73 can be inserted from both ends of the second screw 712. After the two ball nuts are installed, the first screw 711 and the second screw 712 are connected together.

[0030] In some embodiments, Figure 2 and Figure 3 As shown, the first reduction unit 3 and the second reduction unit 6 both include a driving wheel 8 and a driven wheel 9, the driving wheel 8 is used to be connected to the output ends of the first motor 2 and the second motor 5, and the driving wheel 8 is connected to the driven wheel 9 through a transmission member 10. That is, the output shaft of the motor is connected to the driving wheel 8 to drive the driving wheel 8 and the output shaft to rotate together, so that the driving wheel 8 drives the driven wheel 9 to rotate through the transmission member 10, and the driving wheel 8 and the driven wheel 9 are synchronously driven to rotate through the transmission member 10, which can improve the transmission efficiency and load capacity.

[0031] Specifically, Figure 2 and Figure 3 As shown, the transmission member 10 can be configured as a synchronous belt 11, and the synchronous belt 11 is wound around the outer peripheral side of the driving wheel 8 and the driven wheel 9. That is, the driving wheel 8 drives the synchronous belt 11 to move through the friction between the synchronous belt 11 and the driven wheel 9, and the synchronous belt 11 drives the driven wheel 9 to rotate through the friction. In order to further improve the friction between the driving wheel 8 and the driven wheel 9 and the synchronous belt 11, a transmission groove can be provided on the outer surface of the driving wheel 8 and the driven wheel 9, and a transmission protrusion can be provided on the inner side of the synchronous belt 11, and the transmission protrusion can be meshed with the transmission groove to further improve the transmission efficiency.

[0032] In some embodiments of the present disclosure, Figures 2 to 4As shown, the driven wheel 9 is used to be connected with the first ball nut 72 and the second ball nut 73 through fasteners. The first ball nut 72 and the driven wheel 9 of the first reduction unit 3 can be both provided with screw holes, so that after the driven wheel 9 of the first reduction unit 3 is sleeved on the outside of the first ball nut 72, the staff can connect the driven wheel of the first reduction unit 3 with the first ball nut 72 through fasteners such as bolts or screws, so that when the first motor 2 drives the driven wheel 9 to rotate, the ball screw mechanism 7 can convert the rotational motion of the driven wheel 9 into the linear motion of the first screw 711, so as to drive the steering rod 14 to move and realize the steering motion. The second ball nut 73 and the driven wheel of the second reduction unit 6 are similar, and the present disclosure will not be repeated here.

[0033] In order to achieve the fixation of the first ball nut 72 and the second ball nut 73, as shown in FIG. Figure 4 As shown, the first ball nut 72 and the second ball nut 73 can be connected to the steering gear housing 15 by installing the bearing 12 to ensure that the first ball nut 72 and the second ball nut 73 can drive the lead screw 71 to move. In addition, the first ball nut 72 and the second ball nut 73 can be tightened by using a clamping nut to ensure the stability of the first ball nut 72 and the second ball nut 73 after being connected to the steering gear housing 15.

[0034] It should be noted that the first drive mechanism 1 and the second drive mechanism 4 also include a motor housing arranged outside the first motor 2 and the second motor 5 and a reduction unit housing arranged outside the first reduction unit 3 and the second reduction unit 6. The motor housing is connected to the reduction unit housing by fasteners such as screws or bolts, and the reduction unit housing can also be connected to the steering gear housing 15 by fasteners such as screws or bolts. Based on this, the sealing of the steering drive structure can be guaranteed and the influence of external force on the steering drive structure can be reduced. Of course, in order to further improve the sealing after the connection between the motor housing, the reduction unit housing and the steering gear housing 15, a sealing ring can be provided at the connection between each housing.

[0035] In addition, part of the steering gear housing 15 will also be mounted on the outer peripheral side of the first lead screw 711 and the second lead screw 712. Therefore, a radial support sleeve may be provided between the first lead screw 711 and the steering gear housing 15, and between the second lead screw 712 and the steering gear housing 15. The radial support sleeve may reduce the radial vibration of the first lead screw 711 and the second lead screw 712, thereby ensuring the stability of the ball screw mechanism 7 during operation.

[0036] In some embodiments, Figure 1 As shown, the first motor 2 and the second motor 5 may both be connected to a controller 13 , so that the controller 13 controls the first motor 2 and the second motor 5 to operate after receiving a turning signal.

[0037] The second aspect of the present disclosure provides a steering gear, comprising a steering rod 14 and the above-mentioned steering drive structure, wherein the steering rod 14 is connected to the ball screw mechanism 7. The steering gear has all the beneficial effects of the above-mentioned steering drive structure, which will not be described in detail in the present disclosure.

[0038] A third aspect of the present disclosure provides a steering system, including the above-mentioned steering gear. The steering system has all the beneficial effects of the above-mentioned steering gear, which will not be elaborated in the present disclosure.

[0039] A fourth aspect of the present disclosure provides a vehicle, comprising the above-mentioned steering system. The vehicle has all the beneficial effects of the above-mentioned steering system, which will not be described in detail in the present disclosure.

[0040] In summary, the present disclosure exemplarily illustrates the use process of the steering drive structure.

[0041] The steering drive structure disclosed in the present invention, under normal working conditions, the first drive mechanism 1 and the second drive mechanism 4 jointly drive the steering rod 14 to move through the ball screw mechanism 7. After receiving the steering signal, the output ends of the first motor 2 and the second motor 5 drive the driving wheel 8 to rotate, thereby driving the driven wheel 9 to rotate through the synchronous belt 11. The driven wheel 9 will drive the first ball nut 72 and the second ball nut 73 to rotate, so as to convert the rotational motion of the driven wheel 9 into the linear motion of the screw 71, and then drive the steering rod 14 to move to achieve the steering work. In this process, the first motor 2 and the second motor 5 respectively bear 50% of the steering load, which can improve the controllability during steering and reduce the loss of the two sets of drive mechanisms. When one of the first drive mechanism 1 or the second drive mechanism 4 fails, the other set of drive mechanisms can bear 100% of the steering load to complete the steering work, thereby improving the stability and reliability of the steering drive structure. In addition, the ball screw mechanism 7 drives the screw 71 to move by rolling friction, which can improve the transmission efficiency and bearing capacity of the drive structure and reduce the wear and noise during transmission.

[0042] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0043] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0044] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A steering drive structure, characterized in that: include: A first driving mechanism, comprising a first motor and a first reduction unit; A second driving mechanism includes a second motor and a second reduction unit; as well as A ball screw mechanism is used to connect to a steering rod, wherein the first reduction unit and the second reduction unit are respectively connected to the ball screw mechanism; the first motor can drive the steering rod to move through the first reduction unit and the ball screw mechanism; the second motor can drive the steering rod to move through the second reduction unit and the ball screw mechanism.

2. The steering drive structure according to claim 1, characterized in that: The ball screw mechanism includes a screw connected to the steering rod and a first ball nut and a second ball nut threadedly connected to the screw, the first ball nut is connected to the first reduction unit, and the second ball nut is connected to the second reduction unit.

3. The steering drive structure according to claim 2, characterized in that: The lead screw comprises a first lead screw and a second lead screw which are in opposite rotation directions and are detachably connected, and the first ball nut and the second ball nut are respectively threadedly connected to the first lead screw and the second lead screw.

4. The steering drive structure according to claim 2, characterized in that: The first reduction unit and the second reduction unit both include a driving wheel and a driven wheel, the driving wheel is used to be connected to the output ends of the first motor and the second motor, and the driving wheel is connected to the driven wheel through a transmission member.

5. The steering drive structure according to claim 4, characterized in that: The transmission member is configured as a synchronous belt, and the synchronous belt is wound around a portion of the outer circumference of the driving wheel and the driven wheel.

6. The steering drive structure according to claim 4, characterized in that: The driven wheel is used to be connected with the first ball nut and the second ball nut through a fastener.

7. The steering drive structure according to claim 6, characterized in that: The first ball nut and the second ball nut are both connected to the steering gear housing through mounting bearings.

8. The steering drive structure according to any one of claims 1 to 7, characterized in that: The first motor and the second motor are both connected to a controller.

9. A steering gear, characterized in that: It comprises a steering rod and a steering drive structure according to any one of claims 1 to 8, wherein the steering rod is connected to the ball screw mechanism.

10. A steering system, characterized in that: Including the diverter as described in claim 9.

11. A vehicle, characterized in that: Includes the steering system as claimed in claim 10.

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