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CN-121993721-A - Drive-by-wire steering actuator with mechanical self-locking function

CN121993721ACN 121993721 ACN121993721 ACN 121993721ACN-121993721-A

Abstract

The invention discloses a steer-by-wire actuator with a mechanical self-locking function, which relates to the technical field of steer-by-wire actuators and comprises an actuator shell assembly, wherein a wheel steering mechanism capable of sliding left and right and a self-locking driving mechanism for driving the wheel steering mechanism are arranged in the actuator shell assembly, a displacement detection mechanism is also arranged in the actuator shell assembly, a lower circulation mechanism is arranged on the back surface of the actuator shell assembly, and an upper circulation mechanism is arranged on the left side and the top of the actuator shell assembly. According to the invention, after the waste lubricating oil in the actuator housing assembly is discharged, the inner wall of the actuator housing assembly can be flushed at high pressure by using the new lubricating oil, and the flushing area is increased by matching with the rotation of the hollow shaft, so that the residual lubricating oil is discharged under the drive of the new lubricating oil, thereby effectively reducing the residual quantity of the waste lubricating oil in the actuator housing assembly and reducing the influence on the service life of the new lubricating oil.

Inventors

  • LONG YONGJIE
  • WANG XIN
  • HU CHENWEI

Assignees

  • 成都市技师学院(成都工贸职业技术学院、成都市高级技工学校、成都铁路工程学校)

Dates

Publication Date
20260508
Application Date
20260409

Claims (10)

  1. 1. The drive-by-wire steering actuator with the mechanical self-locking function comprises an actuator housing assembly (1) and is characterized in that a wheel steering mechanism (2) capable of sliding left and right and a self-locking driving mechanism (3) used for driving the wheel steering mechanism (2) are arranged in the actuator housing assembly (1), a displacement detection mechanism (4) is further arranged in the actuator housing assembly (1), a lower circulation mechanism (5) is arranged on the back of the actuator housing assembly (1), an upper circulation mechanism (6) is jointly arranged on the left side and the top of the actuator housing assembly (1), and a positive and negative pressure generation mechanism (7) in transmission connection with the self-locking driving mechanism (3) is arranged in the upper circulation mechanism (6); The lower circulation mechanism (5) comprises an oil storage tank (51) fixedly arranged on the back of the lower shell (11), an oil outlet pipe (52) is fixedly arranged at the left bottom of the oil storage tank (51) in a penetrating mode, the output end of the oil outlet pipe (52) is fixedly connected with a three-way valve (53), the first input end of the three-way valve (53) is connected with the oil outlet pipe (52), the second input end of the three-way valve (53) is fixedly connected with a circulating pipe A (54), and the output end of the three-way valve (53) is fixedly connected with a circulating pipe B (55).
  2. 2. The steering-by-wire actuator with a mechanical self-locking function according to claim 1, wherein the actuator housing assembly (1) comprises a lower housing (11), an intermediate housing (12) is fixedly nested at the front side of the top of the lower housing (11), an upper housing (13) is fixedly nested at the top of the outer side of the intermediate housing (12), and a pressure equalizing valve is fixedly connected at the top of the rear side of the upper housing (13).
  3. 3. The steering-by-wire actuator with the mechanical self-locking function according to claim 2, wherein lubricating oil is filled in the lower shell (11), the middle shell (12) and the upper shell (13), an oil drain port (14) is formed in the bottom of the right side of the front surface of the lower shell (11), and a sealing plug A (15) is detachably arranged at the front end of the oil drain port (14).
  4. 4. The steering-by-wire actuator with the mechanical self-locking function according to claim 3, wherein the wheel steering mechanism (2) comprises a sliding shaft (21) positioned on the inner side of the lower shell (11), linear bearings (22) are slidably sleeved at two ends of the outer side of the sliding shaft (21), the two linear bearings (22) are fixedly arranged at two ends of the inner side of the lower shell (11) respectively, two ends of the sliding shaft (21) are connected with steering pull rods (23) through universal joints, and racks (24) are fixedly arranged in the middle of the front surface of the sliding shaft (21).
  5. 5. The steering-by-wire actuator with a mechanical self-locking function according to claim 4, wherein the self-locking driving mechanism (3) comprises a worm (31) which is rotatably nested inside the upper shell (13) through a ball bearing and a motor (32) which is fixedly arranged on the right side of the upper shell (13), and the motor (32) is in transmission connection with the worm (31).
  6. 6. The steering-by-wire actuator with a mechanical self-locking function according to claim 5, wherein the self-locking driving mechanism (3) further comprises a hollow shaft (33) which is positioned at the inner side of the middle shell (12) and is rotatably nested in the lower shell (11) and the upper shell (13) through a ball bearing, a worm wheel (34) which is in transmission connection with the worm (31) is fixedly sleeved on the top of the outer side of the hollow shaft (33), a gear (35) which is meshed with the rack (24) is fixedly sleeved on the bottom of the outer side of the hollow shaft (33), a plurality of injection channels (36) which are communicated with the inner cavity of the hollow shaft (33) are uniformly formed in the outer side of the hollow shaft (33), and the injection channels (36) are respectively positioned in the lower shell (11), the middle shell (12) and the upper shell (13).
  7. 7. The steering-by-wire actuator with a mechanical self-locking function according to claim 6, wherein the displacement detection mechanism (4) comprises a back plate (41) fixedly arranged in the middle of the back surface of the sliding shaft (21), two displacement sensing blocks (42) are fixedly arranged on the back surface of the back plate (41), the displacement detection mechanism (4) further comprises a fixing plate (43) fixedly arranged on the rear side of the inner cavity of the lower shell (11), and two displacement sensing coils (44) are fixedly arranged on the front surface of the fixing plate (43).
  8. 8. The steering-by-wire actuator with the mechanical self-locking function of claim 7, wherein the right side of the top of the oil storage tank (51) is provided with an oil filling port (56), and the top end of the oil filling port (56) is detachably provided with a sealing plug B (57).
  9. 9. The steering-by-wire actuator with mechanical self-locking function according to claim 8, wherein the upper circulating mechanism (6) comprises a piston cylinder (61) fixedly arranged on the left side of the upper shell (13), the output end of the circulating pipe B (55) is fixedly penetrated and arranged on the front left end of the piston cylinder (61), the left end of the top of the piston cylinder (61) is fixedly penetrated and arranged with a circulating pipe C (62), the oil outlet pipe (52), the circulating pipe A (54), the circulating pipe B (55) and the circulating pipe C (62) are respectively provided with a one-way valve, the output end of the circulating pipe C (62) is fixedly connected with a filter (63) fixedly arranged on the top of the upper shell (13), the output end of the filter (63) is fixedly connected with a circulating pipe D (64), the output end of the circulating pipe D (64) is fixedly connected with a rotary joint (65), and the D (64) is connected to the top of the hollow shaft (33) through the rotary joint (65) and is communicated with the inner cavity of the hollow shaft (33).
  10. 10. The steering by wire actuator with mechanical self-locking function of claim 9, wherein the positive and negative pressure generating mechanism (7) comprises a reciprocating screw (71) connected to the left end of the worm (31) through a one-way bearing, a transmission sleeve (72) is sleeved on the outer side of the reciprocating screw (71) in a transmission manner, a piston plate (73) which is positioned on the left side of an inner cavity of the piston cylinder (61) and is matched with the piston cylinder (61) is fixedly connected to the left end of the transmission sleeve (72), a guide plate (74) is fixedly sleeved on the right end of the outer side of the transmission sleeve (72), a guide hole (75) is formed in the top of the right side of the guide plate (74), and a guide shaft (76) which is fixedly arranged on the left side of the upper shell (13) is arranged on the inner side of the guide hole (75) in a sliding manner.

Description

Drive-by-wire steering actuator with mechanical self-locking function Technical Field The invention relates to the technical field of steering-by-wire actuators, in particular to a steering-by-wire actuator with a mechanical self-locking function. Background The drive-by-wire steering actuator is an electromechanical integrated device which is arranged on a front axle of a vehicle and directly drives steering wheels, is responsible for converting electronic control signals into actual steering actions of the wheels, thoroughly eliminates mechanical hard connection between the steering wheel and the steering wheels, and is a key execution component of automatic driving and intelligent chassis. Most of the steer-by-wire actuators for passenger vehicles adopt a life maintenance-free lubrication design, have no conventional lubricating oil adding port, and a special grease adding port provided with a dust cover is arranged on a commercial vehicle with partial heavy load, high load and long mileage. When the actual lubricating oil is replaced, the oil drain port is usually opened firstly, so that the waste lubricating oil is drained under the action of gravity, then the oil drain port is closed, the oil drain port is opened, then new lubricating oil is added through the oil drain port, but in the process, a considerable part of waste lubricating oil is often adhered to the inner wall of the steering gear shell and cannot be drained, after the new lubricating oil is added, the residual waste lubricating oil is mixed with the new lubricating oil, so that the quality of the lubricating oil is reduced, and the service life of the new lubricating oil is influenced. Therefore, it is necessary to invent a steer-by-wire actuator with a mechanical self-locking function to solve the above-mentioned problems. Disclosure of Invention The invention aims to provide a steer-by-wire actuator with a mechanical self-locking function, after the waste lubricating oil in the actuator housing assembly is discharged, the inner wall of the actuator housing assembly can be flushed at high pressure by utilizing new lubricating oil, the flushing area is increased, the residual lubricating oil is discharged under the drive of the new lubricating oil while being matched with the rotation of a hollow shaft, the residual quantity of the waste lubricating oil in the actuator housing assembly is further effectively reduced, the influence on the service life of the new lubricating oil is reduced, and the problem that in the prior art, a considerable part of the waste lubricating oil is adhered to the inner wall of the steering housing and cannot be discharged is solved, and when the new lubricating oil is added, the residual waste lubricating oil is mixed with the new lubricating oil, so that the quality of the lubricating oil is reduced, and the service life of the new lubricating oil is influenced. The drive-by-wire steering actuator with the mechanical self-locking function comprises an actuator shell assembly, wherein a wheel steering mechanism capable of sliding left and right and a self-locking driving mechanism for driving the wheel steering mechanism are arranged in the actuator shell assembly, a displacement detection mechanism is also arranged in the actuator shell assembly, a lower circulation mechanism is arranged on the back surface of the actuator shell assembly, an upper circulation mechanism is arranged on the left side and the top of the actuator shell assembly, and a positive and negative pressure generating mechanism in transmission connection with the self-locking driving mechanism is arranged in the upper circulation mechanism; The lower circulation mechanism comprises an oil storage tank fixedly arranged on the back of the lower shell, an oil outlet pipe is fixedly arranged at the bottom of the left side of the oil storage tank in a penetrating mode, the output end of the oil outlet pipe is fixedly connected with a three-way valve, the first input end of the three-way valve is connected with the oil outlet pipe, the second input end of the three-way valve is fixedly connected with a circulating pipe A, and the output end of the three-way valve is fixedly connected with a circulating pipe B. Preferably, the actuator housing assembly comprises a lower housing, a middle housing is fixedly nested in the front side of the top of the lower housing, an upper housing is fixedly sleeved on the top of the outer side of the middle housing, and a pressure equalizing valve is fixedly connected to the top of the rear side of the upper housing. Preferably, the lubricating oil is filled in the lower shell, the middle shell and the upper shell, an oil drain port is arranged at the bottom of the right side of the front surface of the lower shell, and a sealing plug A is detachably arranged at the front end of the oil drain port. Preferably, the wheel steering mechanism comprises a sliding shaft positioned at the inner side of the lower shell