CN113232714A - Power-assisted mechanism for commercial vehicle circulating ball steering gear and power-assisted method on steering gear - Google Patents

Power-assisted mechanism for commercial vehicle circulating ball steering gear and power-assisted method on steering gear Download PDF

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Publication number
CN113232714A
CN113232714A CN202110665917.3A CN202110665917A CN113232714A CN 113232714 A CN113232714 A CN 113232714A CN 202110665917 A CN202110665917 A CN 202110665917A CN 113232714 A CN113232714 A CN 113232714A
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CN
China
Prior art keywords
gear
worm
steering gear
power
commercial vehicle
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110665917.3A
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Chinese (zh)
Inventor
朱新亮
傅早清
赵波
张柯文
王庆军
任树
孔真斌
侯学为
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Hubei Henglong Automotive System Group Co Ltd
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Hubei Henglong Automotive System Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Hubei Henglong Automotive System Group Co Ltd filed Critical Hubei Henglong Automotive System Group Co Ltd
Priority to CN202110665917.3A priority Critical patent/CN113232714A/en
Publication of CN113232714A publication Critical patent/CN113232714A/en
Pending legal-status Critical Current

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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
    • B62D3/04—Steering gears mechanical of worm type
    • B62D3/06—Steering gears mechanical of worm type with screw and nut
    • B62D3/08—Steering gears mechanical of worm type with screw and nut using intermediate balls or the like
    • 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
    • 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
    • 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)
  • Gear Transmission (AREA)
  • Power Steering Mechanism (AREA)

Abstract

The invention relates to a power-assisted mechanism for a commercial vehicle recirculating ball steering gear and a power-assisted method on the steering gear, belonging to the technical field of commercial vehicle electric recirculating ball steering gears. One end of the motor is fixedly provided with a controller, and the controller is connected with the sensor through a lead; a worm is arranged in the power assisting mechanism shell through bearings at two ends and is connected with a transmission shaft of a motor through a coupler; a worm and pinion shaft is fixedly supported in the circulating ball shell through a big end bearing and a small end bearing, the front end of the pinion shaft is meshed with a big gear installed on a steering screw rod, a worm wheel is fixedly installed at the rear end of the pinion shaft, and the worm wheel is meshed with a worm. The power-assisted mechanism has simple structure and good practicability, and solves the problems that the output torque of the existing electric steering gear can only meet the requirement of the output torque of a light-truck commercial vehicle basically and can not meet the torque output requirement of medium and heavy commercial vehicles; meanwhile, the structure form is single, the interference with the overall shape space is often caused, and the requirement of the overall clearance of a customer is difficult to meet.

Description

Power-assisted mechanism for commercial vehicle circulating ball steering gear and power-assisted method on steering gear
Technical Field
The invention relates to a power-assisted mechanism for a commercial vehicle recirculating ball steering gear and a power-assisted method on the steering gear, belonging to the technical field of commercial vehicle electric recirculating ball steering gears.
Background
At present, a speed reducing mechanism used by an electric steering gear commonly used by vehicles is in a conventional one-level worm gear and worm speed reducing mechanism form, because a metal worm gear is high in noise and low in efficiency, the worm gear is generally made of nylon materials with high use efficiency and low noise, and a worm is made of metal materials, but the nylon materials cannot bear large torque due to the strength problem, the output torque of the electric steering gear basically only can meet the requirement of the output torque of a light commercial vehicle, and cannot meet the torque output requirement of medium and heavy commercial vehicles; meanwhile, the structure form is single, the interference with the overall appearance space is often caused, and the requirement of a client on the overall clearance is difficult to meet, so that the improvement is necessary.
Disclosure of Invention
The invention aims to: the boosting mechanism for the circulating ball steering gear of the commercial vehicle and the boosting method on the steering gear are large in transmission ratio, high in efficiency and capable of flexibly changing the position of the speed reducing mechanism so as to meet the requirements of large-torque steering and compact-space-arrangement vehicle types of the commercial vehicle.
The technical scheme of the invention is as follows:
a power-assisted mechanism for a commercial vehicle recirculating ball steering gear; including controller (ECU), motor, worm wheel, pinion shaft and gear wheel, its characterized in that: a motor is fixedly arranged on the power assisting mechanism shell, a controller is fixedly arranged at one end of the motor, and the controller is connected with the sensor through a lead; a worm is arranged in the power assisting mechanism shell through bearings at two ends and is connected with a transmission shaft of a motor through a coupler; one side of the worm is provided with a pinion shaft through a big end bearing and a small end bearing, the front end of the pinion shaft is meshed with a big gear installed on the steering screw rod, the rear end of the pinion shaft is fixedly provided with a worm wheel, and the worm wheel is meshed with the worm.
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 sensor rotor and the sensor stator are used for collecting the deformation angle of the torsion bar and uploading the generated torque and angle signals to the controller, and the controller controls the output torque of the motor according to the sensor signals and the rotating speed signals of the whole vehicle.
The big gear is a bevel gear.
The bull gear be bevel gear.
The pinion shaft is a pinion bevel gear shaft.
The pinion shaft is a pinion bevel gear shaft.
The worm 9 is the input end of the primary transmission; the gear shaft and the gear wheel form secondary transmission, and the gear wheel is the output end of the secondary 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;
in the formula: t1 is: output torque of the electric recirculating ball steering gear: t2 is: rated torque of the motor, i1 is: the worm gear transmission ratio, eta 1 is: worm gear transmission efficiency, i2 is: a gear ratio; η 2 is: gear transmission efficiency; i3 is: the transmission ratio of the steering gear is as follows: η 3 is: the steering gear transmission efficiency.
The invention has the beneficial effects that:
the power-assisted mechanism for the commercial vehicle recirculating ball steering gear is simple in structure and good in practicability, and can be divided into a primary transmission mechanism consisting of a worm and a worm wheel and a secondary transmission mechanism consisting of a pinion shaft and a bull gear according to the structural function, because the power-assisted mechanism adopts the structural form of a two-stage speed reducing mechanism, the transmission ratio of a two-stage transmission ratio is larger than that of a single-stage worm and gear, and under the same output torque of the worm and gear, the two-stage transmission is realized through the gear, so that the output capacity of the power-assisted recirculating ball steering gear is improved; the electric power-assisted mechanism can be arranged at the input end of the electric recirculating ball steering gear or at the tail part of the steering gear shell according to the space requirement of the whole vehicle so as to meet the gap requirement of a client on the whole vehicle, and the problem that the output torque of the conventional electric steering gear can only meet the output torque requirement of a light truck commercial vehicle and can not meet the torque output requirement of medium and heavy commercial vehicles is solved; meanwhile, the structure form is single, the interference with the overall shape space is often caused, and the requirement of the overall clearance of a customer is difficult to meet.
Drawings
FIG. 1 is a schematic view of an assembly structure of the present invention;
FIG. 2 is a sectional structure diagram of a first-stage worm and gear speed reducing mechanism of the electric power-assisted mechanism;
FIG. 3 is a sectional view of the two-stage bevel gear speed reducer of the electric power-assisted mechanism,
FIG. 4 is a schematic view of a sectional space of a two-stage bevel gear speed reducing mechanism of the electric power-assisted mechanism;
FIG. 5 is a schematic structural view of an electric power assist mechanism after improvement;
fig. 6 is a sectional schematic view of the two-stage bevel gear speed reducing mechanism after the electric power assisting mechanism is improved.
In the figure: 1. the steering mechanism comprises an input shaft, 2, a torsion bar, 3, a steering screw, 4, a steering gear shell, 5, a steering nut, 6, a steering arm shaft, 7, a controller, 8, a motor, 9, a worm, 10, a worm gear, 11, a pinion shaft, 12, a large gear, 13, a locking nut, 14, a sensor, 15, a boosting mechanism shell, 16, a coupler, 17, a large-end bearing, 18 and a small-end bearing.
Detailed Description
The electric power-assisted mechanism for the commercial vehicle recirculating ball steering gear comprises a power-assisted mechanism shell 15, a controller 7, a motor 8, a worm 9, a worm wheel 10, a pinion shaft 11 and a bull gear 12, wherein when the power-assisted mechanism is assembled, the power-assisted mechanism shell 15 is fixedly arranged on a steering gear shell 4 of the recirculating ball steering gear, and the power-assisted mechanism shell 15 and the steering gear shell 4 can also be of an integrated structure. The recirculating ball steering gear includes: the steering mechanism comprises an input shaft 1, a torsion bar 2, a steering screw rod 3, a dust cover, a dust seal, a bearing, an upper cover, a middle shell, an adjusting gasket, a steering gear shell 4, a steering nut 5, a steel ball, a steering arm shaft, a side cover assembly and a bottom cover, wherein after the input shaft 1 is rotated, the input shaft 1 drives the steering screw rod 3 to rotate, the steering nut 5 is driven to reciprocate through the circular rotation motion of the steering screw rod 3, the steering arm shaft 6 is driven to rotate circularly through the reciprocating motion of the steering nut 5, and therefore the steering of the whole vehicle is achieved.
A large gear 12 fixedly arranged on the steering screw rod 3 and one end of a motor 8 of the boosting mechanism are fixedly provided with a controller 7, and the controller 7 is connected with a sensor 14 arranged on the input shaft 1 through a lead (the controller adopts the existing controller with a mature structure). The other end of the motor 8 is fixedly connected with a power-assisted mechanism shell 15, worms 9 are arranged in the power-assisted mechanism shell 15 through symmetrically arranged bearings, and the worms 9 are connected with a transmission shaft of the motor 8 through a coupling 16; a small gear shaft 11 is arranged in a boosting mechanism shell 15 on one side of a worm 9 through a large end bearing 17 and a small end bearing 18, the small gear shaft 11 on one side of the large end bearing 17 is axially limited through a shaft retainer ring and a locking nut 13 to the large end bearing 17, a worm wheel 10 is fixedly arranged on the small gear shaft 11 on the rear end of the locking nut 13, the worm wheel 10 is meshed with the worm 9, and the front end of the small gear shaft 11 is meshed with a large gear 12 fixedly arranged on a steering screw rod 3.
The large gear 12 of the boosting mechanism is a helical gear. The position of the power-assisted mechanism can be flexibly changed, and the power-assisted mechanism can be arranged at the input end close to the recirculating ball steering gear or at the tail part of the steering gear shell during design and can be designed according to the space of the whole vehicle according to actual needs.
The boosting mechanism can be divided into a primary transmission mechanism consisting of a worm 9 and a worm wheel 10 according to the structural function, the worm 9 is used as the input end of the primary speed reducing mechanism and is meshed with the worm wheel 10, a secondary transmission mechanism consisting of a pinion shaft 11 and a bull gear 12 is used as the output end of the secondary speed reducing mechanism, and the bull gear 12 is used as the output end of the secondary speed reducing mechanism. Because the power-assisted mechanism adopts the structural form of a two-stage speed reducing mechanism, the transmission ratio of a single-stage worm gear and a single-stage worm is higher in two-stage transmission ratio, and the two-stage transmission of the large gear 12 is realized under the same output torque of the worm gear 10 and the worm 9, so that the output capacity of the electric recirculating ball steering gear is improved.
In the invention, the output torque of the electric circulating ball steering gear is as follows: t1, motor rated torque: t2, worm gear ratio: i1, worm gear transmission 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;
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 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;
the invention adopts the two-stage transmission mechanism, can reasonably distribute the transmission ratios (i 1 and i 2) of the worm gear and the gear, flexibly change the directions of the worm gear and the gear reduction structure and meet the requirement of the whole vehicle safety space gap of different vehicle types;
under the condition that the total transmission ratio is not changed, the transmission ratio of the worm gear and the worm can be reduced, the transmission ratio of the metal gear is increased, and the reliability and the safety of the nylon worm gear are higher.
Such as: the worm gear is made of nylon materials and can only bear certain torque, the transmission ratio of the gear can be increased on the premise that the total transmission ratio is unchanged, the transmission ratio of the worm gear is reduced, the nylon worm gear bears small torque, and the safety factor of the worm gear is improved.
As an improvement of the two-stage transmission mechanism, the pinion shaft 11 is a small bevel gear shaft, and the large gear 12 is a bevel gear.
When a driver rotates a steering wheel in the driving process of an automobile, the resistance borne by the whole automobile tire is transmitted to a steering screw rod, a torsion bar 2 can relatively rotate under the action of the rotating torque of the steering wheel and the resistance of the steering screw rod to cause the torsion bar to deform, a sensor rotor and a sensor stator 14 can generate torque and angle signals according to the deformation angle of the torsion bar 2 and transmit the torque and the angle signals to a controller 7, the controller 7 controls the output torque of a motor 8 according to the signals of the sensor, the rotating speed of the whole automobile and the like, the motor 8 transmits the torque to a worm gear speed reducing mechanism and a gear transmission speed reducing mechanism and finally transmits the torque to the steering screw rod 3, then, the torque is transmitted to a steering rocker arm through a steel ball in a trajectory of the steering screw rod 3, a steering nut 5 and a steering arm shaft 6, and the torque is transmitted to a whole vehicle knuckle arm by the steering rocker arm, so that the electric power steering function 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 worm, the worm transmits the torque to a worm wheel through meshing action, the worm wheel is fixed at one end of a pinion shaft, the torque is transmitted to a pinion, the pinion transmits the torque to a gearwheel through meshing action, the gearwheel transmits the torque to a screw, the screw 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 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 worm, the worm transmits the torque to a worm wheel through meshing action, the worm wheel is fixed at one end of a pinion shaft, the torque is transmitted to the pinion, the pinion transmits the torque to a gearwheel through meshing action, the gearwheel transmits the torque to a screw, the screw 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 mechanism is simple in structure and good in practicability, and due to the fact that the power-assisted mechanism adopts a structural form of a two-stage speed reducing mechanism, the transmission ratio of a single-stage worm gear and a single-stage worm is larger in two-stage transmission ratio, and under the condition that the worm gear 10 and the worm 9 have the same output torque, the two-stage transmission is conducted through the large gear 12, and therefore the output capacity of the electric recirculating ball steering gear is improved. The output torque of the conventional electric steering gear can only meet the requirement of the output torque of a light truck commercial vehicle basically and can not meet the torque output requirement of medium and heavy commercial vehicles; meanwhile, the structure form is single, the interference with the overall shape space is often caused, and the requirement of the overall clearance of a customer is difficult to meet.

Claims (8)

1. A power-assisted mechanism for a commercial vehicle recirculating ball steering gear; including controller (7), motor (8), worm (9), worm wheel (10), pinion shaft (11) and gear wheel (12), its characterized in that: a motor is fixedly arranged on the power-assisted mechanism shell (15), a controller (7) is fixedly arranged at one end of the motor (8), and the controller (7) is connected with a sensor (14) through a lead; a worm (9) is arranged in the power-assisted mechanism shell (15) through bearings at two ends, and the worm (9) is connected with a transmission shaft of the motor (8) through a coupler; a pinion shaft (11) is arranged on one side of the worm (9) through a big end bearing (17) and a small end bearing (18), the front end of the pinion shaft (11) is meshed with a big gear (12) arranged on the steering screw rod (3), a worm wheel (10) is fixedly arranged at the rear end of the pinion shaft (11), and the worm wheel (10) is meshed with the worm (9).
2. The power assist mechanism for a recirculating ball steering gear of a commercial vehicle as set forth in claim 1, wherein: the worm (9) and the worm wheel (10) form primary transmission, and the worm (9) is the input end of the primary transmission; the small gear shaft (11) and the big gear shaft (12) form secondary transmission, and the big gear shaft is the output end of the secondary transmission; wherein:
primary transmission output torque: t1 = T2 × η 1 × i1 × i3 × η 3
Secondary transmission output torque: t1 = T2 × i1 × η 1 × i2 × η 2 × i3 × η 3;
in the formula: t1 is: output torque of the electric recirculating ball steering gear: t2 is: rated torque of the motor, i1 is: the worm gear transmission ratio, eta 1 is: worm gear transmission efficiency, i2 is: a gear ratio; η 2 is: gear transmission efficiency; i3 is the steering gear ratio: η 3 is: the steering gear transmission efficiency.
3. The power assist mechanism for a recirculating ball steering gear of a commercial vehicle as set forth in claim 1, wherein: the sensor (14) is composed of a sensor rotor and a sensor stator, and the sensor (14) is installed on an input shaft (1) of the recirculating ball steering gear.
4. The power assist mechanism for a recirculating ball steering gear of a commercial vehicle as set forth in claim 2, wherein: the sensor rotor and the sensor stator are used for collecting deformation angles of the torsion bar (2) and uploading generated torque and angle signals to the controller (7), and the controller (7) controls output torque of the motor (8) according to the sensor signals and finished automobile rotating speed signals.
5. The power assist mechanism for a recirculating ball steering gear of a commercial vehicle as set forth in claim 1, wherein: the big gear (12) is a helical gear.
6. The power assist mechanism for a recirculating ball steering gear of a commercial vehicle as set forth in claim 1, wherein: the big gear (12) is a bevel gear.
7. The power assist mechanism for a recirculating ball steering gear of a commercial vehicle as set forth in claim 1, wherein: the pinion shaft (11) is a bevel pinion shaft.
8. The power assist mechanism for a recirculating ball steering gear of a commercial vehicle as set forth in claim 1, wherein: the pinion shaft (11) is a pinion bevel gear shaft.
CN202110665917.3A 2021-06-16 2021-06-16 Power-assisted mechanism for commercial vehicle circulating ball steering gear and power-assisted method on steering gear Pending CN113232714A (en)

Priority Applications (1)

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CN202110665917.3A CN113232714A (en) 2021-06-16 2021-06-16 Power-assisted mechanism for commercial vehicle circulating ball steering gear and power-assisted method on steering gear

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Application Number Priority Date Filing Date Title
CN202110665917.3A CN113232714A (en) 2021-06-16 2021-06-16 Power-assisted mechanism for commercial vehicle circulating ball steering gear and power-assisted method on steering gear

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103448789A (en) * 2012-05-31 2013-12-18 台达电子企业管理（上海）有限公司 Double-worm electric power steering device and system
CN105128927A (en) * 2015-09-28 2015-12-09 纪国庆 Automobile electric power steering device
CN210912588U (en) * 2019-07-22 2020-07-03 浙江万安泵业有限公司 Mounting structure of lightweight electric power steering device
CN111776064A (en) * 2020-08-07 2020-10-16 湖北恒隆汽车系统集团有限公司 Electric circulating ball steering gear assembly for medium truck commercial vehicle
CN111891212A (en) * 2020-09-03 2020-11-06 安徽德孚转向系统股份有限公司 Electric power-assisted steering system for unmanned single-wheel steering vehicle
US20210155286A1 (en) * 2019-11-25 2021-05-27 Steering Solutions Ip Holding Corporation Electric recirculating ball power steering system
CN214823579U (en) * 2021-06-16 2021-11-23 湖北恒隆汽车系统集团有限公司 Power-assisted mechanism for commercial vehicle recirculating ball steering gear

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103448789A (en) * 2012-05-31 2013-12-18 台达电子企业管理（上海）有限公司 Double-worm electric power steering device and system
CN105128927A (en) * 2015-09-28 2015-12-09 纪国庆 Automobile electric power steering device
CN210912588U (en) * 2019-07-22 2020-07-03 浙江万安泵业有限公司 Mounting structure of lightweight electric power steering device
US20210155286A1 (en) * 2019-11-25 2021-05-27 Steering Solutions Ip Holding Corporation Electric recirculating ball power steering system
CN111776064A (en) * 2020-08-07 2020-10-16 湖北恒隆汽车系统集团有限公司 Electric circulating ball steering gear assembly for medium truck commercial vehicle
CN111891212A (en) * 2020-09-03 2020-11-06 安徽德孚转向系统股份有限公司 Electric power-assisted steering system for unmanned single-wheel steering vehicle
CN214823579U (en) * 2021-06-16 2021-11-23 湖北恒隆汽车系统集团有限公司 Power-assisted mechanism for commercial vehicle recirculating ball steering gear

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