A medium-duty dual-power electric recirculating ball steering gear

Abstract

The utility model discloses a medium-load dual-power electric recirculating ball steering gear, comprising a shell, a first electric control unit is arranged on the left side of the shell, a second electric control unit is arranged on the right side of the shell, a screw shaft is arranged at the center of the shell, an input shaft is arranged at the left end of the screw shaft, a torsion bar is arranged at the left end of the input shaft, a nut is arranged on the outside of the screw shaft, the nut cooperates with a rocker arm, an input end gear is arranged at the left end of the screw shaft, an output end gear is arranged at the right end of the screw shaft, the input end gear and the output end gear synchronously receive the power assist instructions of the first electric control unit and the second electric control unit, and act the combined power assist on the screw shaft. The steering device controls the working mode of the dual steering motors, and the combined deceleration power assist of the dual motors can effectively overcome the steering damping and ensure the lightness of the steering of the medium-sized commercial vehicle.

Description

Technical Field

[0001] The utility model relates to a tool, more specifically, to a medium-load dual-power electric circulating ball steering device. Background Art

[0002] At present, the R&D and manufacturing of intelligent driving steering for light commercial vehicles generally adopts a single reduction mechanism and a set of motor control to improve steering feel and driving experience. Due to the limited output torque of a single set of motors and gears, the current ordinary electric recirculating ball steering gear cannot meet the sufficient power requirements on medium-sized commercial vehicles with relatively large loads, and car manufacturers are still using traditional hydraulic steering systems. Utility Model Content

[0003] Based on this, it is necessary to provide a medium-load dual-power electric recirculating ball steering gear to address the above technical problems.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A medium-duty load dual-power electric circulating ball steering gear, characterized in that the medium-duty load dual-power electric circulating ball steering gear comprises a housing, a first electric control unit is disposed on the left side of the housing, and a second electric control unit is disposed on the right side of the housing.

[0006] A screw shaft is provided at the center of the housing, an input shaft is provided at the left end of the screw shaft, a torsion bar is provided at the left end of the input shaft, a nut is provided outside the screw shaft, and the nut cooperates with the rocker arm.

[0007] The left end of the screw shaft is provided with an input end gear, and the right end of the screw shaft is provided with an output end gear. The input end gear and the output end gear synchronously receive the power assistance instructions of the first electronic control unit and the second electronic control unit, and apply the combined power assistance to the screw shaft.

[0008] As a preferred embodiment of the utility model, the input shaft and the intermediate screw shaft constitute a first-stage reduction unit, and the screw shaft and the nut constitute a second reduction unit.

[0009] As a preferred embodiment of the present utility model, the first-stage reduction unit is a worm gear structure, and the second reduction unit is a screw nut structure.

[0010] As a preferred embodiment of the utility model, a torque angle TAS sensor is provided on one side of the torsion bar, and the torque angle TAS sensor adapts to the input load change of the torsion bar and simultaneously transmits signals to the first electronic control unit and the second electronic control unit.

[0011] As a preferred embodiment of the utility model, a power connection is provided on the housing.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model provides a medium-duty load dual-power electric recirculating ball steering gear, which controls the operation of dual steering motors, and the combined deceleration power of the dual motors can effectively overcome the steering damping, ensuring the portability of steering of medium-duty commercial vehicles. In addition, while providing a greater steering torque, the steering system has a partial redundancy function. After a single motor control fails, the system still has 50% torque output, which greatly improves the stability of vehicle operation and the safety of power steering. In emergency mode, the actual driver can safely park the vehicle by the side of the road. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a three-dimensional structural schematic diagram of a medium-load dual-power electric recirculating ball steering gear of the utility model;

[0016] Figure 2 for Figure 1 A schematic cross-sectional view of a medium-duty dual-power electric recirculating ball steering gear;

[0017] The markings in the figure are as follows: 1. Input shaft; 10. First electronic control unit; 11. Second electronic control unit; 12. Torque bar; 2. Torque angle TAS sensor; 3. Input end gear; 4. Screw shaft; 6. Rocker arm; 7. Nut; 8. Output end gear; S, housing. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0019] like Figure 1 and Figure 2 As shown, the medium-duty load dual-power electric recirculating ball steering gear comprises a housing S, a left side of which is provided with a first electric control unit 10 , and a right side of which is provided with a second electric control unit 11 .

[0020] The center of the housing S is provided with a screw shaft 4, the left end of the screw shaft 4 is provided with an input shaft 1, the left end of the input shaft 1 is provided with a torsion bar 12, the outside of the screw shaft 4 is provided with a nut 7, and the nut 7 cooperates with the rocker arm 6.

[0021] The input shaft 1 and the intermediate screw shaft 4 constitute a first-stage reduction unit, and the screw shaft 4 and the nut 7 constitute a second reduction unit.

[0022] It should be noted that the first-stage reduction unit is a worm gear structure, and the second reduction unit is a screw-nut structure.

[0023] The left end of the screw shaft 4 is provided with an input end gear 3, and the right end of the screw shaft 4 is provided with an output end gear 8. The input end gear 3 and the output end gear 8 synchronously receive the power assist instructions of the first electronic control unit 10 and the second electronic control unit 11, and apply the combined power assist to the screw shaft 4.

[0024] A torque angle TAS sensor 2 is disposed on one side of the torsion bar 12 . The torque angle TAS sensor 2 adapts to the input load change of the torsion bar 12 and transmits signals to the first electronic control unit 10 and the second electronic control unit 11 at the same time.

[0025] The housing S is provided with a power connection.

[0026] The working mode of the medium load dual power electric recirculating ball steering gear is described below.

[0027] The torque angle TAS sensor 2 monitors the input load change of the torsion bar 12 and transmits the signal to the first electronic control unit 10 and the second electronic control unit 11. Then, the first electronic control unit 10 and the second electronic control unit 11 synchronously send the power assist command to the input end gear 3 and the output end gear 8, and the input end gear 3 and the output end gear 8 will combine the power assist to act on the screw shaft 4. Finally, the nut 7 converts the rotational motion of the screw shaft 4 into linear motion, acts on the rocker arm 6, and finally drives the wheel to rotate left and right, realizing the power steering function.

[0028] When the first electronic control unit or the second electronic control unit diagnoses a partial hardware or software failure, the primary and secondary functions of the first electronic control unit or the second electronic control unit can be switched to realize emergency takeover.

[0029] The medium-duty dual-power electric recirculating ball steering gear controls the operation of the dual steering motors. The combined deceleration power of the dual motors can effectively overcome the steering damping and ensure the portability of steering for medium-duty commercial vehicles. In addition, while providing greater steering torque, the steering system has a partial redundancy function. After a single motor control fails, the system still has 50% torque output, which greatly improves the stability of vehicle operation and the safety of power steering. In emergency mode, the actual driver can safely pull the vehicle over.

[0030] Without limitation to this, any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope defined in the claims.

Claims

1. A medium-duty dual-power electric recirculating ball steering gear, characterized in that: The medium-load dual-power electric recirculating ball steering gear comprises a housing (S), a first electric control unit (10) is provided on the left side of the housing (S), a second electric control unit (11) is provided on the right side of the housing (S), a screw shaft (4) is provided at the center of the housing (S), an input shaft (1) is provided at the left end of the screw shaft (4), a torsion bar (12) is provided at the left end of the input shaft (1), a nut (7) is provided on the outside of the screw shaft (4), and the nut (7) cooperates with a rocker arm (6). An input end gear (3) is provided at the left end of the screw shaft (4), and an output end gear (8) is provided at the right end of the screw shaft (4). The input end gear (3) and the output end gear (8) synchronously receive power assist instructions from the first electronic control unit (10) and the second electronic control unit (11), and apply the combined power assist to the screw shaft (4).

2. The medium-duty dual-power electric recirculating ball steering gear according to claim 1 is characterized in that: The input shaft (1) and the intermediate screw shaft (4) constitute a first-stage reduction unit, and the screw shaft (4) and the nut (7) constitute a second reduction unit.

3. The medium-duty dual-power electric recirculating ball steering gear according to claim 2 is characterized in that: The first stage reduction unit is a worm gear structure, and the second reduction unit is a screw nut structure.

4. The medium-duty dual-power electric recirculating ball steering gear according to claim 1 is characterized in that: A torque angle TAS sensor (2) is provided on one side of the torsion bar (12). The torque angle TAS sensor (2) adapts to the input load change of the torsion bar (12) and simultaneously transmits signals to the first electronic control unit (10) and the second electronic control unit (11).

5. The medium-duty dual-power electric recirculating ball steering gear according to claim 1 is characterized in that: The housing (S) is provided with a power connection.

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