CN113212540A - Power-assisted steering structure for recirculating ball steering gear - Google Patents
Power-assisted steering structure for recirculating ball steering gear Download PDFInfo
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- CN113212540A CN113212540A CN202110665916.9A CN202110665916A CN113212540A CN 113212540 A CN113212540 A CN 113212540A CN 202110665916 A CN202110665916 A CN 202110665916A CN 113212540 A CN113212540 A CN 113212540A
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- 230000003134 recirculating effect Effects 0.000 title claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 32
- 230000007246 mechanism Effects 0.000 claims abstract description 26
- 208000032370 Secondary transmission Diseases 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 208000032369 Primary transmission Diseases 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 244000309464 bull Species 0.000 claims description 4
- 230000009467 reduction Effects 0.000 abstract description 9
- 101100518501 Mus musculus Spp1 gene Proteins 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
- B62D3/12—Steering gears mechanical of rack-and-pinion type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
The invention relates to a power-assisted steering structure for a recirculating ball steering gear, and belongs to the field of electric recirculating ball steering gears of commercial vehicles. A gear shaft shell is fixedly arranged on an output end shell of the electric circulation ball steering gear body, a large gear shaft is arranged in the gear shaft shell through a bearing A and a bearing B which are symmetrically arranged, and one end of the large gear shaft is connected with a steering screw of the electric circulation ball steering gear body. The two-stage speed reduction electric circulating ball steering gear is simple in structure and good in practicability, and can effectively reduce power loss and pollution; the secondary transmission mechanism can be an integral unit independently, and is convenient to install, disassemble and inspect; by adopting the two-stage transmission mechanism, the transmission ratio of the belt wheel and the helical gear can be reasonably distributed, and the space and the output torque of different vehicle types can be matched. The problem of current worm gear structure bearing capacity is limited, transmission efficiency low grade factor has decided its whole steering system output capacity not high is solved, install and use on being applicable to light, medium and heavy motorcycle type.
Description
Technical Field
The invention relates to a power-assisted steering structure for a recirculating ball steering gear, belonging to the technical field of electric recirculating ball steering gears.
Background
With the development of new energy and automatic driving technology, the trend of automobile electromotion is increasingly obvious, and an electric steering gear matched with the automobile electromotion trend appears, and the automobile electromotion steering gear has the advantages of intelligence, environmental protection, energy conservation and the like. The electric steering gear is widely used in light truck type of passenger vehicle or commercial vehicle, and is generally a worm gear reduction mechanism connected with a rack mechanical steering gear or a circulating ball mechanical steering gear.
Disclosure of Invention
The invention aims to: the two-stage speed reduction electric circulating ball steering gear for the commercial vehicle has large transmission ratio and high efficiency, and can meet the torque output requirements of light, medium and heavy vehicles.
The technical scheme of the invention is as follows:
the utility model provides a power assisted steering structure for recirculating ball steering gear, includes gear shaft casing, motor, controller, sensor, pinion shaft and bull gear axle, its characterized in that: a motor is fixedly arranged at the upper end of a gear shaft shell, a controller is fixedly arranged on the motor and electrically connected with a sensor, a small belt pulley is arranged on a transmission shaft of the motor, a large gear shaft is arranged in the gear shaft shell through a bearing C and a bearing D which are symmetrically arranged, key grooves are uniformly distributed on the circumference of the end head of one end of the large gear shaft and used for being connected with a steering screw rod of a recirculating ball steering gear, the small gear shaft is arranged in the gear shaft shell on one side of the large gear shaft through a bearing A and a bearing B which are symmetrically arranged, the large gear is meshed with the small gear shaft, a large belt pulley is fixedly arranged at one end of the small gear shaft, and the small belt pulley is connected with the large belt pulley through a transmission belt; a tension pulley is arranged between the small belt pulley and the large belt pulley through a gear shaft shell, and the tension pulley is in contact connection with the transmission belt so as to adjust the tightness of the transmission belt; the large belt pulley, the small belt pulley, the tension pulley and the transmission belt form primary transmission, and a gear reduction mechanism is formed by a small gear shaft, a large gear and a large gear shaft; the belt pulley reducing mechanism cooperates with the gear reducing mechanism to form a two-stage transmission, wherein:
primary transmission output torque: t1 = T2 × i1 × η 1 × i3 × η 3
Secondary transmission output torque: t1 = T2 × i1 × η 1 × i2 × η 2 × i3 × η 3.
The input shaft of the electric circulating ball steering gear body is provided with a sensor, and the sensor is connected with the controller through a lead.
The big gear is a bevel gear.
The sensor is composed of a sensor rotor and a sensor stator, the sensor is installed on an input shaft of the recirculating ball steering gear, and the sensor is connected with the controller through a lead.
The end face of the steering screw corresponding to the large gear shaft is provided with an assembly hole, the inner wall of the assembly hole is provided with key teeth corresponding to the key groove, and the large gear shaft and the steering screw are connected through the matching key of the key groove and the key teeth.
The power-assisted method of the power-assisted steering structure comprises the following steps:
1) when the vehicle runs straight, the steering wheel is in the middle position, the torsion bar is not deformed, the sensor does not generate angle and torque signals and transmits the angle and torque signals to the controller and the motor, the motor does not output torque and transmits the torque to the power assisting mechanism, the steering gear does not generate steering torque, and the vehicle keeps running straight.
2) When the vehicle left steering wheel rotates leftwards, the torsion bar deforms, and the sensor generates a torque signal; the controller controls the motor to output corresponding torque according to the torque signal of the sensor, the torque is transmitted to the belt pulley, the belt pulley transmits the torque to the pinion shaft through meshing, the pinion transmits the torque to the large gear through meshing, the large gear transmits the torque to the screw rod, the screw rod transmits the torque to the arm shaft through the circulating ball steering gear, the arm shaft transmits the torque to the hub through the hanging arm, the pull rod and the knuckle arm, and the hub rotates left under the action of the torque.
3) When the right steering wheel of the vehicle rotates rightwards, the torsion bar deforms, the sensor generates a torque signal to upload, the controller controls the motor to output corresponding torque according to the magnitude of the torque signal of the sensor, the torque is transmitted to the belt pulley, the belt pulley transmits the torque to the pinion shaft through meshing action, the pinion transmits the torque to the large gear through meshing action, the large gear transmits the torque to the screw rod, the screw rod transmits the torque to the arm shaft through the recirculating ball steering gear, the arm shaft passes through the vertical arm, the pull rod and the knuckle arm transmit the torque to the hub, and the hub rotates rightwards under the action of the torque.
The invention has the following positive effects:
the invention adopts the secondary transmission mechanism consisting of the belt speed reducing mechanism with high torque transmission efficiency and the bevel gear speed reduction, and can effectively reduce power loss and pollution; the secondary transmission mechanism can be independently an integral unit, so that the installation and the disassembly and the inspection are convenient; the invention adopts a two-stage transmission mechanism, can reasonably distribute the transmission ratio of the belt wheel and the helical gear, and is matched with the space and the output torque of different vehicle types. The problem of current worm gear structure bearing capacity is limited, transmission efficiency low grade factor has decided its whole steering system output capacity not high is solved, install and use on being applicable to light, medium and heavy motorcycle type.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a belt retarding mechanism assembly;
fig. 3 is a schematic structural view of the gear reduction mechanism.
In the figure: 1. belt housing, 2, a bearing, 3, oil seal, 4, gear shaft housing, 5, B bearing, 6, C bearing, 7, number 1 adjusting nut, 8, pinion shaft, 9, gearwheel shaft, 10, D bearing, 11, bearing support base, 12, oil seal, 13, number 2 adjusting nut, 14, number 3 adjusting nut, 15 gearwheel shaft keyway, 16, oil seal, 17, motor, 18, E bearing, 19, controller, 20, steering nut, 21, arm shaft, 22, housing, 23, steering screw, 24, bolt, 25, F bearing, 26, intermediate housing, 27, oil seal, 28, sensor, 29, torsion bar, 30, front cover, 31, G bearing, 32, oil seal, 33, dust seal, 34, input shaft, 35, small pulley, 36, belt, 37, large pulley, 38, tension pulley.
Detailed Description
The power-assisted steering structure for the recirculating ball steering gear comprises a gear shaft shell 4, a motor 17, a controller 19, a pinion shaft 8 and a bull gear shaft 9, wherein the gear shaft shell 4 is fixedly arranged on a steering gear shell 22 of the recirculating ball steering gear during assembly, and the gear shaft shell 4 and the steering gear shell 22 can also be of an integrated structure. The recirculating ball steering gear comprises an input shaft 34, a torsion bar 29, a steering screw 23, a steering gear shell 22, a steering nut 20 and a steering arm shaft 21, wherein after steering power is transmitted to the input shaft 34, the input shaft 34 drives the steering screw 23 to rotate, the steering nut 20 is driven to reciprocate on the steering screw 23 through the circular rotation motion of the steering screw 23, and the steering nut 20 drives the steering arm shaft 21 to circularly swing and rotate through the reciprocating motion, so that the steering of the whole vehicle is realized. A large gear shaft 9 is arranged in the gear shaft shell 4 through a bearing C6 and a bearing D10 which are symmetrically arranged, an adjusting nut 13 is arranged on the large gear shaft 9 on the outer side of the bearing D10, the adjusting nut 13 plays a role in pre-tightening the axial direction of the bearing, and the pre-tightening amount is controlled according to the idle clearance requirement of gear meshing. An assembly hole is formed in the end head of the output end of the steering screw 23, key teeth are uniformly distributed on the circumference of the inner wall of the assembly hole, key grooves are uniformly distributed on the circumference of the end head of the large gear shaft 9 corresponding to the key teeth, and the steering screw 23 is connected with the large gear shaft 9 through the matching key of the key teeth and the key grooves. The large gear shaft between the bearing C6 and the bearing D10 is a bevel gear shaft.
A pinion shaft 8 is arranged in the gear shaft shell 4 on one side of the pinion shaft 9 through a bearing A2 and a bearing B5 which are symmetrically arranged, the pinion shaft 9 is meshed with the pinion shaft 8, an adjusting nut 7 is arranged on the pinion shaft 8 on the outer side of a bearing B5 to axially limit the bearing for assembling the pinion shaft 8, a large belt pulley 37 is fixedly arranged at one end of the pinion shaft 8, a motor 17 is fixedly arranged at the upper end of the gear shaft shell 4 above the large belt pulley 37, a 19 controller (ECU) is fixedly arranged on the motor 17, and the motor 17 and the 19 controller are of an integrated structure; a small belt pulley 35 is mounted on a transmission shaft of the motor 17, the small belt pulley 35 is connected with a large belt pulley 37 through a transmission belt 36, a tension pulley 38 is mounted between the small belt pulley 35 and the large belt pulley 36 through the gear shaft shell 4, and the tension pulley 38 is in contact connection with the transmission belt 36 so as to adjust the tightness of the transmission belt 36. The sensor 28 is mounted on the input shaft 34 of the electric recirculating ball steering gear body, and the sensor 28 comprises a sensor rotor and a sensor stator. The sensor 28 is connected to the controller 19 by a wire. During operation, the sensor 28 is used for collecting a deformation angle of the torsion bar 10, and uploading a generated torque and an angle signal to the controller 19, and the controller 19 controls the output torque of the motor 17 according to the sensor signal and a rotating speed signal of the whole vehicle.
The two-stage speed reduction electric circulating ball steering gear comprises a belt pulley speed reduction mechanism (primary transmission) consisting of a large belt pulley 37, a small belt pulley 35, a tension pulley 38 and a transmission belt 36, and a gear speed reduction mechanism consisting of a small gear shaft 8 and a large gear shaft 9; the belt pulley reducing mechanism is matched with the gear reducing mechanism to form a secondary transmission mechanism. In the working process:
primary transmission output torque: t1 = T2 × i1 × η 1 × i3 × η 3 (1)
Secondary transmission output torque: t1 = T2 × i1 × η 1 × i2 × η 2 × i3 × η 3 (2)
In the formula, the output torque of the electric recirculating ball steering gear is as follows: t1, motor rated torque: t2, pulley ratio: i1, pulley efficiency: eta 1, gear ratio i 2; the gear transmission efficiency η 2; the transmission ratio of the steering gear is as follows: i 3; the steering gear transmission efficiency η 3;
in the comparison calculation formulas (1) and (2), the output torque in the first-stage transmission is far smaller than the output torque in the second-stage transmission; an oil seal is arranged on the pinion shaft 8 and used for isolating the belt speed reducing mechanism and the gear speed reducing mechanism to prevent environmental permeation pollution and leakage. When the vehicle needs to steer in the advancing process, the steering wheel is rotated, the torsion bar 29 generates torsion deformation, the sensor collects torsion torque and angle signals generated by torsion and transmits the torsion torque and angle signals to the controller 19, and the controller 19 outputs the torsion torque and angle signals to the motor 17 according to the collected sensor signals and in combination with a vehicle speed signal of the whole vehicle, so that the motor drives the belt speed reducing mechanism and the bevel gear speed reducing mechanism to transmit power to the steering screw 23, and the electric power-assisted steering of the vehicle is realized.
The method specifically comprises the following steps:
when the whole vehicle runs straight, the steering wheel is in the middle position, the torsion bar is not deformed, the sensor does not generate angle and torque signals and transmits the angle and torque signals to the ECU and the motor, the motor does not output torque and transmits the torque to the power assisting mechanism, the steering gear does not generate steering torque, and the whole vehicle keeps running straight.
In the process of left steering of the whole vehicle, a steering wheel rotates leftwards, a torsion bar deforms, a sensor generates a torque signal (T3), an ECU controls a motor to output corresponding torque according to the magnitude of the torque signal of the sensor, the torque is transmitted to a belt pulley, the belt pulley transmits the torque to a pinion shaft through meshing, the pinion transmits the torque to a gearwheel through meshing, the gearwheel transmits the torque to a screw rod, the screw rod transmits the torque to an arm shaft through a recirculating ball steering gear, the arm shaft transmits the torque to a wheel hub through a hanging arm, a pull rod and a knuckle arm, and the wheel hub rotates leftwards under the action of the torque.
In the process of right steering of the whole vehicle, a steering wheel rotates rightwards, a torsion bar deforms, a sensor generates a torque signal (T3), an ECU controls a motor to output corresponding torque according to the magnitude of the torque signal of the sensor, the torque is transmitted to a belt pulley, the belt pulley transmits the torque to a pinion shaft through meshing action, the pinion transmits the torque to a large gear through meshing action, the large gear transmits the torque to a screw rod, the screw rod transmits the torque to an arm shaft through a recirculating ball steering gear, the arm shaft transmits the torque to a hub through a hanging arm, a pull rod and a knuckle arm, and the hub rotates rightwards under the action of the torque.
The power-assisted steering structure for the recirculating ball steering gear has the characteristics of simple structure and good practicability, and can effectively reduce power loss and pollution; the secondary transmission mechanism can be an integral unit independently, and is convenient to install, disassemble and inspect; by adopting the two-stage transmission mechanism, the transmission ratio of the belt wheel and the helical gear can be reasonably distributed, and the space and the output torque of different vehicle types can be matched. The problem of current worm gear structure bearing capacity is limited, transmission efficiency low grade factor has decided its whole steering system output capacity not high is solved, install and use on being applicable to light, medium and heavy motorcycle type.
Claims (3)
1. A power steering structure for a recirculating ball steering gear, comprising a gear shaft housing (4), a motor (17), a controller (19), a pinion shaft (8), a sensor (28) and a bull gear shaft (9), characterized in that: a gear shaft shell (4) is fixedly arranged on an output end shell of an electric circulation ball steering gear body, a large gear shaft (9) is arranged in the gear shaft shell (4) through a bearing C (6) and a bearing D (10) which are symmetrically arranged, one end of the large gear shaft (9) is connected with a steering screw rod (23) of the electric circulation ball steering gear body, a small gear shaft (8) is arranged in the gear shaft shell (4) on one side of the large gear shaft (9) through a bearing A (2) and a bearing B (5) which are symmetrically arranged, the large gear shaft (9) is meshed with the small gear shaft (8) through a gear, a large belt pulley (37) is fixedly arranged at one end of the small gear shaft (8), a motor (17) is fixedly arranged at the upper end of the gear shaft shell (4), a controller (19) is fixedly arranged on the motor (17), a transmission shaft small belt pulley (35) of the motor (17) is arranged on the transmission shaft, and the small belt pulley (35) is connected with the large belt pulley (37) through a transmission belt (36), a sensor (28) is arranged on an input shaft (34) of the electric recirculating ball steering gear body, and the sensor (28) is connected with a controller (19) through a lead; a tension pulley (38) is arranged between the small belt pulley (35) and the large belt pulley (37) through a gear shaft shell (4), and the tension pulley (38) is in contact connection with the transmission belt (36) so as to adjust the tightness of the transmission belt (36); big belt pulley (37), belt pulley (35), take-up pulley (38) and driving belt (36) constitute primary drive, cooperate primary drive by pinion shaft (8) and bull gear axle (9) and constitute secondary drive, wherein:
primary transmission output torque: t1 = T2 × i1 × η 1 × i3 × η 3
Secondary transmission output torque: t1 = T2 × i1 × η 1 × i2 × η 2 × i3 × η 3;
the power-assisted method of the power-assisted steering structure comprises the following steps:
1) in the process of straight-ahead driving of the vehicle, the steering wheel is in the middle position, the torsion bar (29) is not deformed, the sensor (28) does not generate angle and torque signals and transmits the angle and torque signals to the controller (19) and the motor (17), and the motor (17) does not output torque and transmits the torque to the power assisting mechanism;
2) when the vehicle left steering wheel rotates leftwards, the torsion bar (29) deforms, and the sensor (28) generates a torque signal; the controller (19) controls the motor (17) to output corresponding torque according to the torque signal of the sensor (28), the torque is transmitted to the belt pulley, the belt pulley transmits the torque to the pinion shaft (8) through meshing, the pinion shaft (8) transmits the torque to the large gear (9) through meshing, the large gear (9) transmits the torque to the steering screw (23), the steering screw (23) transmits the torque to the arm shaft through the recirculating ball steering gear, the arm shaft transmits the torque to the hub through the vertical arm, the pull rod and the knuckle arm, and the hub rotates to the left under the action of the torque; realizing left steering;
3) when a vehicle right steering wheel rotates rightwards, a torsion bar (29) deforms, a sensor (28) generates a torque signal to upload, a controller (19) controls a motor (17) to output a corresponding torque according to the magnitude of the torque signal of the sensor (28), the torque is transmitted to a belt pulley, the belt pulley transmits the torque to a pinion shaft (8) through meshing action, the pinion shaft (8) transmits the torque to a large gear (9) through meshing action, the large gear (9) transmits the torque to a steering screw rod (23), the steering screw rod (23) transmits the torque to an arm shaft through a recirculating ball steering gear, the arm shaft transmits the torque to a hub through a vertical arm, the pull rod and a knuckle arm transmit the torque to the hub, and the hub rotates rightwards under the action of the torque to realize right steering.
2. A power steering structure for a recirculating ball steering gear as set forth in claim 1, wherein: the big gear (9) is a helical gear.
3. A power steering structure for a recirculating ball steering gear as set forth in claim 1, wherein: the output end of the steering screw rod (23) is provided with an assembly hole, key teeth are uniformly distributed on the circumference of the inner wall of the assembly hole, key grooves are uniformly distributed on the circumference of the end of the large gear shaft (9) corresponding to the key teeth, and the steering screw rod (23) is connected with the large gear shaft (9) through the matching key of the key teeth and the key grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110665916.9A CN113212540A (en) | 2021-06-16 | 2021-06-16 | Power-assisted steering structure for recirculating ball steering gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110665916.9A CN113212540A (en) | 2021-06-16 | 2021-06-16 | Power-assisted steering structure for recirculating ball steering gear |
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| Publication Number | Publication Date |
|---|---|
| CN113212540A true CN113212540A (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110665916.9A Pending CN113212540A (en) | 2021-06-16 | 2021-06-16 | Power-assisted steering structure for recirculating ball steering gear |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023115902A1 (en) * | 2021-12-20 | 2023-06-29 | 湖北恒隆汽车系统集团有限公司 | Cylindrical gear and planet wheel combined type electric power-assisted circulating ball steering gear |
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| CN214875107U (en) * | 2021-06-16 | 2021-11-26 | 湖北恒隆汽车系统集团有限公司 | Power-assisted steering structure for recirculating ball steering gear |
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2021
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| DE102007039733A1 (en) * | 2007-08-22 | 2009-02-26 | Zf Lenksysteme Gmbh | Steering device for motor vehicle, has stopper limiting deflection and number of revolutions of one of elements, where stopper is arranged on one drive output shaft and at input side of belt drive on shaft and implemented as disk stopper |
| CN202992067U (en) * | 2012-12-27 | 2013-06-12 | 杭州新世宝电动转向系统有限公司 | Belt tensioning structure for rack-assist type electric power steering (R-EPS) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023115902A1 (en) * | 2021-12-20 | 2023-06-29 | 湖北恒隆汽车系统集团有限公司 | Cylindrical gear and planet wheel combined type electric power-assisted circulating ball steering gear |
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