阅读说明：本技术 一种循环球转向器双助力机构的装配结构及装配方法 (Assembly structure and assembly method of double-boosting mechanism of recirculating ball steering gear ) 是由 聂敏 傅早清 赵波 任树 王庆军 孔真斌 侯学为 于 2021-07-26 设计创作，主要内容包括：本发明涉及一种循环球转向器双助力机构的装配结构及装配方法；属商用车电动助力转向器领域。本发明在循环球式机械转向器上采用了双助力机构,由于本发明采用双助力机构,当输出扭矩较低时,可减小减速机构传动比,从而减小减速机构外形尺寸；或者保持减速机构传动比不变,降低电机输出扭矩需求,可大大降低电机成本及电机外形尺寸。当输出扭矩较高时,可以降低单套减速机构传动比需求,避免了由于输出扭矩需求带来的超大减速机构传动比问题,以及超大减速机构传动比所带来的外形尺寸大,为了减小外形而牺牲减速机构强度的问题。(The invention relates to an assembly structure and an assembly method of a double-boosting mechanism of a recirculating ball steering gear; belongs to the field of electric power steering devices of commercial vehicles. The double-boosting mechanism is adopted on the recirculating ball type mechanical steering gear, and the double-boosting mechanism is adopted, so that the transmission ratio of the speed reducing mechanism can be reduced when the output torque is lower, and the overall dimension of the speed reducing mechanism is reduced; or the transmission ratio of the speed reducing mechanism is kept unchanged, the output torque requirement of the motor is reduced, and the cost and the overall dimension of the motor can be greatly reduced. When the output torque is higher, the requirement of the transmission ratio of a single set of speed reducing mechanism can be reduced, the problem of the transmission ratio of an oversized speed reducing mechanism caused by the requirement of the output torque is avoided, the appearance size caused by the transmission ratio of the oversized speed reducing mechanism is large, and the problem of sacrificing the strength of the speed reducing mechanism for reducing the appearance is solved.)

1. An assembly method of a double-boosting mechanism of a recirculating ball steering gear; the method is characterized in that: it comprises the following steps:

1) fixedly assembling an input shaft (10), a torsion bar (9), a steering screw (11) and a cylindrical pin (8) of a double-boosting mechanism of the recirculating ball steering gear into a steering screw assembly;

2) fixing a steering screw assembly, a bearing A (13), a middle shell (3) with a pressed small bearing and a baffle (4) together, and simultaneously fixedly mounting a worm wheel (12) of a booster A and a worm wheel (12) of a booster B on a steering screw (11);

3) welding a rotor of the sensor (6) on the end face of the steering screw (11), welding a stator of the sensor (6) on the input shaft (10), and then loading a steel ball (16) into a spiral trajectory between the steering nut (15) and the steering screw (11) to complete the assembly of the middle shell (3) and the screw nut assembly;

4) the bearing B (20) is arranged at the tail part of the steering gear shell (18), and then a sealing element is arranged to complete the assembly of the mechanical steering gear shell assembly;

5) sequentially installing an adjusting gasket (14), a middle shell (3), a steering screw nut assembly, a steering arm shaft and a side cover assembly (17) into the steering gear shell assembly, and then installing an upper cover (5) provided with a bearing C;

6) connecting a sensor wire harness to a sensor (6), tightening and fixing the sensor wire harness by using a hexagonal flange face bolt, testing the axial clearance of an input shaft (10), installing worms (26) of a booster A and a booster B in a steering gear shell (18) corresponding to a worm wheel (12) through a large bearing (24) and a small bearing (27) which are symmetrically arranged in the steering gear shell (18), and connecting the worms (26) with the corresponding worm wheel (12) in a meshing manner; completing the assembly of the circulating ball steering gear body;

7) respectively installing motors (2) of a booster A and a booster B on a steering gear shell (18), and screwing and fixing the motors by using bolts with hexagonal flange surfaces; and then inserting the sensor wire harness into a corresponding clamping groove of the controller (1), and connecting the booster A and the booster B through a whole vehicle signal wire harness assembly, thereby completing the assembly of the double-boosting mechanism of the recirculating ball steering gear.

Technical Field

The invention relates to an assembly structure and an assembly method of a double-boosting mechanism of a recirculating ball steering gear; belongs to the field of electric power steering devices of commercial vehicles.

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, on the other hand, the speed reducing mechanism used by the existing electric steering gear is single in structural form, often interferes with the appearance space of the whole vehicle, and is difficult to meet the requirements of assembling and clearance of the whole vehicle of different customers, so that the speed reducing mechanism needs to be improved.

Disclosure of Invention

The invention aims to: the assembling method of the double power-assisted mechanisms of the recirculating ball steering gear is simple and compact in structure, and can meet the requirements of different clients on the whole vehicle assembling and clearance on the premise of meeting the torque output of medium and heavy commercial vehicles.

The technical scheme of the invention is as follows:

an assembly method of a double-boosting mechanism of a recirculating ball steering gear; the method is characterized in that: it comprises the following steps:

1) fixedly assembling an input shaft, a torsion bar, a steering screw and a cylindrical pin of a double-boosting mechanism of the recirculating ball steering gear into a steering screw assembly;

2) fixing the steering screw assembly, the bearing A, the middle shell pressed with the small bearing and the baffle together, and simultaneously fixedly mounting worm wheels of the booster A and the booster B on the steering screw,

3) welding a rotor of the sensor on the end face of the steering screw rod, welding a stator of the sensor on the input shaft, and then loading a steel ball into a spiral trajectory between the steering nut and the steering screw rod to complete the assembly of the middle shell and the screw nut assembly;

4) the bearing B is arranged at the tail part of the mechanical steering gear shell, and then a sealing element is arranged to complete the assembly of the mechanical steering gear shell assembly;

5) sequentially installing the adjusting gasket, the middle shell, the steering screw nut assembly, the steering arm shaft and the side cover assembly into the mechanical steering gear shell assembly, and then installing an upper cover provided with a bearing C;

6) connecting a sensor wire harness to a sensor, tightening and fixing the sensor wire harness by using a hexagonal flange face bolt, testing the axial clearance of an input shaft, installing the worms of the booster A and the booster B in a steering gear shell corresponding to the worm wheel through a large bearing and a small bearing which are symmetrically arranged in the steering gear shell, and connecting the worms with the corresponding worm wheel in a meshing manner; completing the assembly of the circulating ball steering gear body;

7) respectively installing motors of the booster A and the booster B on a steering gear shell, and screwing and fixing the motors by using bolts with hexagonal flange surfaces; and then inserting the sensor wire harness into the corresponding clamping groove of the controller, and connecting the booster A and the booster B through a whole vehicle signal wire harness assembly, thereby completing the assembly of the double-boosting mechanism of the recirculating ball steering gear.

The double-boosting mechanism of the recirculating ball steering gear comprises a recirculating ball steering gear body, a booster A and a booster B; the method is characterized in that: the steering gear comprises a steering gear body and is characterized in that a steering gear shell of the steering gear body is provided with an assembling hole A and an assembling hole B, a booster A and a booster B are correspondingly installed on the steering gear shell close to the assembling hole A and the assembling hole B, the booster A and the booster B respectively comprise a motor, a controller, a sensor, a worm and a worm wheel, the worm wheel is fixedly installed on a steering screw rod of the steering gear body, the worm is installed in the assembling hole corresponding to the worm wheel, the worm is connected with the worm wheel in a meshed mode, the controller is fixedly installed at one end of the motor, the other end of the motor is connected with the worm, and the sensor is installed on an input shaft of the steering gear body; the sensor is electrically connected with the controller.

The assembling hole A is formed in a steering gear shell at the front end of the recirculating ball steering gear body, the assembling hole B is formed in a steering gear shell at the rear end of the recirculating ball steering gear body, a worm wheel of the booster A is fixedly arranged on a steering screw rod corresponding to the assembling hole A, and a worm wheel of the booster B is fixedly arranged on a steering screw rod corresponding to the assembling hole B.

The assembling hole A is formed in the upper portion of a steering gear shell at the rear end of the recirculating ball steering gear body, the assembling hole B is formed in the lower portion of the steering gear shell at the rear end of the recirculating ball steering gear body, a worm wheel of the booster A is fixedly arranged on a steering screw rod corresponding to the assembling hole A, and a worm wheel of the booster B is fixedly arranged on a steering screw rod corresponding to the assembling hole B. The assembly holes A and the assembly holes B are arranged in a staggered mode.

The assembling hole A is formed in the upper portion of a steering gear shell at the front end of the recirculating ball steering gear body, the assembling hole B is formed in the lower portion of the steering gear shell at the front end of the recirculating ball steering gear body, a worm wheel of the booster A is fixedly installed on a steering screw rod corresponding to the assembling hole A, a worm wheel of the booster B is fixedly installed on a steering screw rod corresponding to the assembling hole B, and the assembling hole A and the assembling hole B are arranged in a staggered mode.

The assembly structure of the double power-assisted mechanisms of the recirculating ball steering gear; the double-boosting mechanism comprises a booster A and a booster B; the method is characterized in that: the steering gear shell of the recirculating ball steering gear body is provided with an assembling hole A and an assembling hole B, the steering gear shell close to the assembling hole A and the assembling hole B is correspondingly provided with a booster A and a booster B, and a worm wheel is fixedly arranged on a steering screw rod of the recirculating ball steering gear body corresponding to the booster A and the booster B; a sensor is arranged on an input shaft of the recirculating ball steering gear body; the booster A and the booster B respectively consist of a motor, a controller and a worm, a large bearing and a small bearing are symmetrically arranged in a steering gear shell corresponding to the assembling hole, the worm is fixed through the large bearing and the small bearing, one end of the worm is meshed with the worm wheel, the controller is fixedly arranged at one end of the motor, the other end of the motor is connected with the other end of the worm, and the sensor is electrically connected with the controller.

Assembly hole A set up on the steering gear casing upper portion of recirculating ball steering gear body front end, assembly hole B sets up the steering gear casing lower part at recirculating ball steering gear body front end, booster A's worm install in assembly hole A, booster B's worm is installed in assembly hole B, booster A's worm and booster B's worm are connected with the worm wheel meshing respectively, coaxial setting between assembly hole A and the assembly hole B.

Assembly hole A set up on the steering gear casing upper portion of recirculating ball steering gear body rear end, assembly hole B sets up the steering gear casing lower part at recirculating ball steering gear body rear end, booster A's worm install in assembly hole A, booster B's worm is installed in assembly hole B, booster A's worm and booster B's worm are connected with the worm wheel meshing respectively, coaxial setting between assembly hole A and the assembly hole B.

In operation, the rotor and the stator of the sensor 6 are used for collecting the deformation angle of the torsion bar 9, the generated torque and angle signals are simultaneously transmitted to the controller 1 of the booster A and the booster B, and the controller 1 controls the output torque of the motor 2 according to the sensor signals and the rotating speed signals of the whole vehicle. Wherein:

assembly output torque: t1 = 2 × T2 × i1 × η 1 × i2 × η 2;

in the formula: t1 is: the 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: mechanical steering gear ratio: η 2 is: mechanical steering gear transmission efficiency;

the invention has the positive effects that:

1) the invention adopts double power-assisted mechanisms on the recirculating ball type mechanical steering gear, synchronously controls two motors through a controller (ECU), and realizes intelligent steering of the whole vehicle through a sensor in the recirculating ball type mechanical steering gear and signal input of the whole vehicle.

2) Because the double-booster mechanism is adopted, when the output torque is lower, the booster A and the booster B share the output torque (two sets of boosters respectively share half of the output torque), the transmission ratio of the speed reducing mechanism can be reduced, and the overall dimension of the speed reducing mechanism is reduced; or the transmission ratio of the speed reducing mechanism is kept unchanged, the output torque requirement of the motor is reduced, and the cost and the overall dimension of the motor can be greatly reduced.

3) Because the double-booster mechanism is adopted, when the output torque is higher, the booster A and the booster B share the torque born by the worm wheel end (two sets of boosters share half the torque respectively), thereby avoiding the problem that the existing nylon material worm wheel cannot bear larger torque. When the output torque is higher, the requirement of the transmission ratio of a single set of speed reducing mechanism can be reduced, the problem of the transmission ratio of an oversized speed reducing mechanism caused by the requirement of the output torque is avoided, the appearance size caused by the transmission ratio of the oversized speed reducing mechanism is large, and the problem of sacrificing the strength of the speed reducing mechanism for reducing the appearance is solved.

4) The double-boosting mechanism can be flexibly installed on the shell of the electric circulating ball steering gear, meets the requirements of different customers on the whole vehicle assembly and clearance, and the requirements of the space arrangement, the output capacity and the intelligent steering function of a full series of commercial vehicles, and can realize the redundancy function through the number of the motors under the condition of using non-redundant motors.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural diagram of example 2 of the present invention;

FIG. 3 is a schematic structural diagram according to embodiment 3 of the present invention;

FIG. 4 is a schematic structural diagram according to embodiment 4 of the present invention;

FIG. 5 is a schematic structural view of example 5 of the present invention;

FIG. 6 is a schematic view of the booster of the present invention;

FIG. 7 is a schematic view of a worm wheel shared by the booster of the present invention.

In the figure: 1. the control device comprises a controller, 2, a motor, 3, an intermediate shell, 4, a baffle, 5, an upper cover, 6, a sensor, 7, a bearing C, 8, a cylindrical pin, 9, a torsion bar, 10, an input shaft, 11, a steering screw, 12, a worm gear, 13, a bearing A, 14, an adjusting gasket, 15, a steering nut, 16, a steel ball, 17, a steering arm shaft and side cover assembly, 18, a steering gear shell, 19, an SAM-shell, 20, a bearing B, 21, a bottom cover, 22, a spring, 23, a large bearing retainer ring, 24, a large bearing, 25, a shaft retainer ring, 26, a worm, 27, a small bearing, 28, a blocking cover, 29, an assembling hole A, 30 and an assembling hole B.

Detailed Description

Example 1:

as shown in fig. 1, a booster a and a booster B are respectively arranged at both ends of the recirculating ball steering gear;

firstly, an input shaft 10, a torsion bar 9, a steering screw 11 and a cylindrical pin 8 of a double-boosting mechanism of the recirculating ball steering gear are fixedly assembled into a steering screw assembly. The double-boosting mechanism of the recirculating ball steering gear comprises a recirculating ball steering gear body, a booster A and a booster B. The recirculating ball steering gear body comprises an input shaft 10, a cylindrical pin 8, a torsion bar 9, a bearing A13, an upper cover 5, an intermediate shell 3, a baffle 4, an adjusting gasket 14, a steering screw rod 11, a mechanical steering gear shell 18, a steering nut 15, a steel ball 16 and a steering arm shaft and side cover assembly 17. The steering gear shell 18 of the recirculating ball steering gear body is provided with a mounting hole A29 and a mounting hole B30, the mounting hole A29 is arranged on the steering gear shell 18 at the front end of the recirculating ball steering gear body, and the mounting hole B30 is arranged on the steering gear shell 18 at the rear end of the recirculating ball steering gear body and is used for correspondingly mounting the booster A and the booster B. The booster A and the booster B are respectively composed of a motor 2, a controller 1, a sensor 6, a worm 26 and a worm wheel 12, and the sensor 6 is composed of a rotor and a stator.

Fixing a steering screw assembly, a bearing A13, a middle shell 3 with a pressed small bearing and a baffle 4 together, fixedly mounting a worm wheel 12 of a booster A and a booster B on a steering screw 11 corresponding to an assembly hole A29 and an assembly hole B30, welding a rotor of a sensor 6 on the end surface of the steering screw 11 and a stator of the sensor 6 on an input shaft 10, and then mounting a steel ball 16 into a spiral trajectory between a steering nut 15 and the steering screw 11 to complete the assembly of the middle shell 3 and a screw nut assembly; the mechanical steering gear housing assembly is assembled by installing bearing B20 into the rear of the steering gear housing 18 and then installing the seals.

The adjusting gasket 14, the middle shell 3, the steering screw nut assembly and the steering arm shaft and side cover assembly 17 are sequentially installed in the mechanical steering gear shell assembly, then the upper cover 5 provided with the bearing C7 is installed, meanwhile, the sensor wire harness is connected to the rotor and the stator of the sensor 6 and is screwed and fixed by a hexagonal flange face bolt, the axial clearance of the input shaft 10 is tested, the worms 26 of the booster A and the booster B are installed in the steering gear shell 18 corresponding to the worm wheel 12 through the large bearing 24 and the small bearing 27 which are symmetrically arranged in the steering gear shell 18, the worms 26 are meshed and connected with the corresponding worm wheel 12, and the assembly of the recirculating ball steering gear body is completed.

Respectively installing the motors 2 of the booster A and the booster B on a steering gear shell 18, and screwing and fixing the motors by using bolts with hexagonal flange surfaces; controller 1 fixed mounting is in 2 one ends of motor, inserts the sensor pencil in controller 1 corresponds the draw-in groove, and the 2 other ends of motor are connected with the worm 26 that corresponds through the pilot hole that corresponds, and controller 1 between booster A and the booster B is connected through whole car signal pencil assembly, accomplishes the assembly of the two helping hand mechanisms of recirculating ball steering gear from this.

Because the double-boosting mechanism of the booster A and the booster B is adopted on the recirculating ball steering gear body, when the output torque is lower, the booster A and the booster B share the output torque (two sets of boosters respectively share half of the output torque), the transmission ratio of the speed reducing mechanism can be reduced, and the overall dimension of the speed reducing mechanism is reduced; or the transmission ratio of the speed reducing mechanism is kept unchanged, the output torque requirement of the motor is reduced, and the cost and the overall dimension of the motor can be greatly reduced. When output torque is higher, booster A and booster B share the moment of torsion that worm wheel end bore (two sets of boosters respectively share half moment of torsion), avoid the problem that current nylon materials worm wheel can't bear great moment of torsion from this. And when the output torque is higher, the requirement of the transmission ratio of a single set of speed reducing mechanism can be reduced, the problem of the transmission ratio of an oversized speed reducing mechanism caused by the requirement of the output torque is avoided, the problem of large overall dimension caused by the transmission ratio of the oversized speed reducing mechanism and the problem of sacrificing the strength of the speed reducing mechanism for reducing the overall dimension are solved.

Example 2:

as shown in fig. 2, a booster a and a booster B are respectively arranged at the upper and lower parts of the tail end of the recirculating ball steering gear;

firstly, an input shaft 10, a torsion bar 9, a steering screw 11 and a cylindrical pin 8 of a double-boosting mechanism of the recirculating ball steering gear are fixedly assembled into a steering screw assembly. The double-boosting mechanism of the recirculating ball steering gear comprises a recirculating ball steering gear body, a booster A and a booster B. The recirculating ball steering gear body comprises an input shaft 10, a cylindrical pin 8, a torsion bar 9, a bearing A13, an upper cover 5, an intermediate shell 3, a baffle 4, an adjusting gasket 14, a steering screw rod 11, a mechanical steering gear shell 18, a steering nut 15, a steel ball 16 and a steering arm shaft and side cover assembly 17. The steering gear shell 18 of the recirculating ball steering gear body is provided with a mounting hole A29 and a mounting hole B30, and a mounting hole A29 is arranged at the upper part of the steering gear shell 18 at the tail end of the recirculating ball steering gear body and is used for correspondingly mounting the booster A. A fitting hole B30 is provided in the lower portion of the steering gear housing 18 at the rear end of the recirculating ball steering gear body for the corresponding mounting of the booster B. The assembly holes A and the assembly holes B are arranged in a staggered mode. The booster A and the booster B are respectively composed of a motor 2, a controller 1, a sensor 6 and a worm 26, and the sensor 6 is composed of a rotor and a stator. Fixing a steering screw assembly, a bearing A13, a middle shell 3 with a pressed small bearing and a baffle 4 together, fixedly mounting a worm wheel 12 of a booster A and a booster B on a steering screw 11 corresponding to an assembly hole A29 and an assembly hole B30, welding a rotor of a sensor 6 on the end surface of the steering screw 11 and a stator of the sensor 6 on an input shaft 10, and then mounting a steel ball 16 into a spiral trajectory between a steering nut 15 and the steering screw 11 to complete the assembly of the middle shell 3 and a screw nut assembly; the mechanical steering gear housing assembly is assembled by installing bearing B20 into the rear of the steering gear housing 18 and then installing the seals.

The adjusting gasket 14, the middle shell 3, the steering screw nut assembly and the steering arm shaft and side cover assembly 17 are sequentially installed in the mechanical steering gear shell assembly, then the upper cover 5 provided with the bearing C7 is installed, meanwhile, the sensor wire harness is connected to the rotor and the stator of the sensor 6 and is screwed and fixed by a hexagonal flange face bolt, the axial clearance of the input shaft 10 is tested, the worms 26 of the booster A and the booster B are installed in the steering gear shell 18 corresponding to the worm wheel 12 through the large bearings 24 and the small bearings 27 symmetrically arranged in the steering gear shell 18, and the worms 26 are meshed and connected with the corresponding worm wheel 12, so that the assembly of the recirculating ball steering gear body is completed.

Respectively installing the motors 2 of the booster A and the booster B on a steering gear shell 18, and screwing and fixing the motors by using bolts with hexagonal flange surfaces; controller 1 fixed mounting is in 2 one ends of motor, inserts the sensor pencil in controller 1 corresponds the draw-in groove, and the 2 other ends of motor are connected with the worm 26 that corresponds through the pilot hole that corresponds, and controller 1 between booster A and the booster B is connected through whole car signal pencil assembly, accomplishes the assembly of the two helping hand mechanisms of recirculating ball steering gear from this.

According to the invention, as the double-boosting mechanism of the booster A and the booster B is adopted on the recirculating ball steering gear body, when the output torque is lower, the booster A and the booster B share the output torque (two sets of boosters respectively share half of the output torque), so that the transmission ratio of the speed reducing mechanism can be reduced, and the overall dimension of the speed reducing mechanism is reduced; or the transmission ratio of the speed reducing mechanism is kept unchanged, the output torque requirement of the motor is reduced, and the cost and the overall dimension of the motor can be greatly reduced. When output torque is higher, booster A and booster B share the moment of torsion that worm wheel end bore (two sets of boosters respectively share half moment of torsion), avoid the problem that current nylon materials worm wheel can't bear great moment of torsion from this. And when the output torque is higher, the requirement of the transmission ratio of a single set of speed reducing mechanism can be reduced, the problem of the transmission ratio of an oversized speed reducing mechanism caused by the requirement of the output torque is avoided, the problem of large overall dimension caused by the transmission ratio of the oversized speed reducing mechanism and the problem of sacrificing the strength of the speed reducing mechanism for reducing the overall dimension are solved.

Example 3:

as shown in fig. 3, a booster a and a booster B are respectively arranged at the upper and lower parts of the front end of the recirculating ball steering gear;

firstly, an input shaft 10, a torsion bar 9, a steering screw 11 and a cylindrical pin 8 of a double-boosting mechanism of the recirculating ball steering gear are fixedly assembled into a steering screw assembly. The double-boosting mechanism of the recirculating ball steering gear comprises a recirculating ball steering gear body, a booster A and a booster B. The recirculating ball steering gear body comprises an input shaft 10, a cylindrical pin 8, a torsion bar 9, a bearing A13, an upper cover 5, an intermediate shell 3, a baffle 4, an adjusting gasket 14, a steering screw rod 11, a mechanical steering gear shell 18, a steering nut 15, a steel ball 16 and a steering arm shaft and side cover assembly 17. The steering gear shell 18 of the recirculating ball steering gear body is provided with a mounting hole A29 and a mounting hole B30, and a mounting hole A29 is arranged at the upper part of the steering gear shell 18 at the front end of the recirculating ball steering gear body and is used for correspondingly mounting the booster A. A fitting hole B30 is provided in the lower portion of the steering gear housing 18 at the front end of the recirculating ball steering gear body for the corresponding mounting of the booster B. The assembly holes A and the assembly holes B are arranged in a staggered mode. The booster A and the booster B are respectively composed of a motor 2, a controller 1, a sensor 6, a worm 26 and a worm wheel 12, and the sensor 6 is composed of a rotor and a stator.

Fixing a steering screw assembly, a bearing A13, a middle shell 3 with a pressed small bearing and a baffle 4 together, fixedly mounting a worm wheel 12 of a booster A and a booster B on a steering screw 11 corresponding to an assembly hole A29 and an assembly hole B30, welding a rotor of a sensor 6 on the end surface of the steering screw 11 and a stator of the sensor 6 on an input shaft 10, and then mounting a steel ball 16 into a spiral trajectory between a steering nut 15 and the steering screw 11 to complete the assembly of the middle shell 3 and a screw nut assembly; the mechanical steering gear housing assembly is assembled by installing bearing B20 into the rear of the steering gear housing 18 and then installing the seals.

The adjusting gasket 14, the middle shell 3, the steering screw nut assembly and the steering arm shaft and side cover assembly 17 are sequentially installed in the mechanical steering gear shell assembly, then the upper cover 5 provided with the bearing C7 is installed, meanwhile, the sensor wire harness is connected to the rotor and the stator of the sensor 6 and is screwed and fixed by a hexagonal flange face bolt, the axial clearance of the input shaft 10 is tested, the worms 26 of the booster A and the booster B are installed in the steering gear shell 18 corresponding to the worm wheel 12 through the large bearings 24 and the small bearings 27 symmetrically arranged in the steering gear shell 18, and the worms 26 are meshed and connected with the corresponding worm wheel 12, so that the assembly of the recirculating ball steering gear body is completed.

Respectively installing the motors 2 of the booster A and the booster B on a steering gear shell 18, and screwing and fixing the motors by using bolts with hexagonal flange surfaces; controller 1 fixed mounting is in 2 one ends of motor, inserts the sensor pencil in controller 1 corresponds the draw-in groove, and the 2 other ends of motor are connected with the worm 26 that corresponds through the pilot hole that corresponds, and controller 1 between booster A and the booster B is connected through whole car signal pencil assembly, accomplishes the assembly of the two helping hand mechanisms of recirculating ball steering gear from this.

According to the invention, as the double-boosting mechanism of the booster A and the booster B is adopted on the recirculating ball steering gear body, when the output torque is lower, the booster A and the booster B share the output torque (two sets of boosters respectively share half of the output torque), so that the transmission ratio of the speed reducing mechanism can be reduced, and the overall dimension of the speed reducing mechanism is reduced; or the transmission ratio of the speed reducing mechanism is kept unchanged, the output torque requirement of the motor is reduced, and the cost and the overall dimension of the motor can be greatly reduced. When output torque is higher, booster A and booster B share the moment of torsion that worm wheel end bore (two sets of boosters respectively share half moment of torsion), avoid the problem that current nylon materials worm wheel can't bear great moment of torsion from this. And when the output torque is higher, the requirement of the transmission ratio of a single set of speed reducing mechanism can be reduced, the problem of the transmission ratio of an oversized speed reducing mechanism caused by the requirement of the output torque is avoided, the problem of large overall dimension caused by the transmission ratio of the oversized speed reducing mechanism and the problem of sacrificing the strength of the speed reducing mechanism for reducing the overall dimension are solved.

Example 4:

as shown in fig. 4; the booster A and the booster B are respectively arranged at the upper part and the lower part of the tail end of the steering gear, and the improvement scheme of the embodiments 1, 2 and 3 is that;

firstly, an input shaft 10, a torsion bar 9, a steering screw 11 and a cylindrical pin 8 of a double-boosting mechanism of the recirculating ball steering gear are fixedly assembled into a steering screw assembly. The double-boosting mechanism of the recirculating ball steering gear comprises a recirculating ball steering gear body, a booster A and a booster B. The recirculating ball steering gear body comprises an input shaft 10, a cylindrical pin 8, a torsion bar 9, a bearing A13, an upper cover 5, an intermediate shell 3, a baffle 4, an adjusting gasket 14, a steering screw rod 11, a mechanical steering gear shell 18, a steering nut 15, a steel ball 16 and a steering arm shaft and side cover assembly 17. The steering gear shell 18 of the recirculating ball steering gear body is provided with a mounting hole A29 and a mounting hole B30, and a mounting hole A29 is arranged at the upper part of the steering gear shell 18 at the tail end of the recirculating ball steering gear body and is used for correspondingly mounting the booster A. A fitting hole B30 is provided in the lower portion of the steering gear housing 18 at the rear end of the recirculating ball steering gear body for the corresponding mounting of the booster B. The assembly hole A and the assembly hole B are coaxially arranged. The booster A and the booster B are respectively composed of a motor 2, a controller 1, a sensor 6, a worm 26 and a worm wheel 12, and the sensor 6 is composed of a rotor and a stator. Booster a and booster B share one worm wheel 12.

Fixing a steering screw assembly, a bearing A13, a middle shell 3 with a pressed small bearing and a baffle 4 together, fixedly installing a worm wheel 12 shared by a booster A and a booster B on a steering screw 11 corresponding to an assembly hole A29 and an assembly hole B30, welding a rotor of a sensor 6 on the end surface of the steering screw 11 and a stator of the sensor 6 on an input shaft 10, and then installing a steel ball 16 into a spiral trajectory between a steering nut 15 and the steering screw 11 to complete the assembly of the middle shell 3 and the screw nut assembly; the mechanical steering gear housing assembly is assembled by installing bearing B20 into the rear of the steering gear housing 18 and then installing the seals.

The adjusting gasket 14, the middle shell 3, the steering screw nut assembly and the steering arm shaft and side cover assembly 17 are sequentially installed in the mechanical steering gear shell assembly, then the upper cover 5 provided with the bearing C7 is installed, meanwhile, the sensor wire harness is connected to the rotor and the stator of the sensor 6 and is screwed and fixed by a hexagonal flange face bolt, the axial clearance of the input shaft 10 is tested, the worms 26 of the booster A and the booster B are installed in the steering gear shell 18 corresponding to the worm wheel 12 through the large bearings 24 and the small bearings 27 symmetrically arranged in the steering gear shell 18, and the worms 26 are respectively meshed and connected with the common worm wheel 12, so that the assembly of the recirculating ball steering gear body is completed.

Respectively installing the motors 2 of the booster A and the booster B on a steering gear shell 18, and screwing and fixing the motors by using bolts with hexagonal flange surfaces; controller 1 fixed mounting is in 2 one ends of motor, inserts the sensor pencil in controller 1 corresponds the draw-in groove, and the 2 other ends of motor are connected with the worm 26 that corresponds through the pilot hole that corresponds, and controller 1 between booster A and the booster B is connected through whole car signal pencil assembly, accomplishes the assembly of the two helping hand mechanisms of recirculating ball steering gear from this.

According to the invention, as the double-boosting mechanism of the booster A and the booster B is adopted on the recirculating ball steering gear body, when the output torque is lower, the booster A and the booster B share the output torque (two sets of boosters respectively share half of the output torque), so that the transmission ratio of the speed reducing mechanism can be reduced, and the overall dimension of the speed reducing mechanism is reduced; or the transmission ratio of the speed reducing mechanism is kept unchanged, the output torque requirement of the motor is reduced, and the cost and the overall dimension of the motor can be greatly reduced. When output torque is higher, booster A and booster B share the moment of torsion that worm wheel end bore (two sets of boosters respectively share half moment of torsion), avoid the problem that current nylon materials worm wheel can't bear great moment of torsion from this. And when the output torque is higher, the requirement of the transmission ratio of a single set of speed reducing mechanism can be reduced, the problem of the transmission ratio of an oversized speed reducing mechanism caused by the requirement of the output torque is avoided, the problem of large overall dimension caused by the transmission ratio of the oversized speed reducing mechanism and the problem of sacrificing the strength of the speed reducing mechanism for reducing the overall dimension are solved. Because the worm of the invention shares one worm wheel, one worm wheel part is reduced, the cost is saved, and the tail length of the shell of the recirculating ball steering gear assembly is reduced.

Example 5:

as shown in fig. 5; the booster A and the booster B are respectively arranged at the upper part and the lower part of the front end of the steering gear, and the improvement scheme of the embodiment 4 is that;

firstly, an input shaft 10, a torsion bar 9, a steering screw 11 and a cylindrical pin 8 of a double-boosting mechanism of the recirculating ball steering gear are fixedly assembled into a steering screw assembly. The double-boosting mechanism of the recirculating ball steering gear comprises a recirculating ball steering gear body, a booster A and a booster B. The recirculating ball steering gear body comprises an input shaft 10, a cylindrical pin 8, a torsion bar 9, a bearing A13, an upper cover 5, an intermediate shell 3, a baffle 4, an adjusting gasket 14, a steering screw rod 11, a mechanical steering gear shell 18, a steering nut 15, a steel ball 16 and a steering arm shaft and side cover assembly 17. The steering gear shell 18 of the recirculating ball steering gear body is provided with a mounting hole A29 and a mounting hole B30, and a mounting hole A29 is arranged at the upper part of the steering gear shell 18 at the front end of the recirculating ball steering gear body and is used for correspondingly mounting the booster A. A fitting hole B30 is provided in the lower portion of the steering gear housing 18 at the front end of the recirculating ball steering gear body for the corresponding mounting of the booster B. The assembly hole A and the assembly hole B are coaxially arranged. The booster A and the booster B are respectively composed of a motor 2, a controller 1, a sensor 6, a worm 26 and a worm wheel 12, and the sensor 6 is composed of a rotor and a stator. Booster a and booster B share one worm wheel 12.

Fixing a steering screw assembly, a bearing A13, a middle shell 3 with a pressed small bearing and a baffle 4 together, fixedly installing a worm wheel 12 shared by a booster A and a booster B on a steering screw 11 corresponding to an assembly hole A29 and an assembly hole B30, welding a rotor of a sensor 6 on the end surface of the steering screw 11 and a stator of the sensor 6 on an input shaft 10, and then installing a steel ball 16 into a spiral trajectory between a steering nut 15 and the steering screw 11 to complete the assembly of the middle shell 3 and the screw nut assembly; the mechanical steering gear housing assembly is assembled by installing bearing B20 into the rear of the steering gear housing 18 and then installing the seals.

The adjusting gasket 14, the middle shell 3, the steering screw nut assembly and the steering arm shaft and side cover assembly 17 are sequentially installed in the mechanical steering gear shell assembly, then the upper cover 5 provided with the bearing C7 is installed, meanwhile, the sensor wire harness is connected to the rotor and the stator of the sensor 6 and is screwed and fixed by a hexagonal flange face bolt, the axial clearance of the input shaft 10 is tested, the worms 26 of the booster A and the booster B are installed in the steering gear shell 18 corresponding to the worm wheel 12 through the large bearings 24 and the small bearings 27 symmetrically arranged in the steering gear shell 18, and the worms 26 are respectively meshed and connected with the common worm wheel 12, so that the assembly of the recirculating ball steering gear body is completed.

Respectively installing the motors 2 of the booster A and the booster B on a steering gear shell 18, and screwing and fixing the motors by using bolts with hexagonal flange surfaces; controller 1 fixed mounting is in 2 one ends of motor, inserts the sensor pencil in controller 1 corresponds the draw-in groove, and the 2 other ends of motor are connected with the worm 26 that corresponds through the pilot hole that corresponds, and controller 1 between booster A and the booster B is connected through whole car signal pencil assembly, accomplishes the assembly of the two helping hand mechanisms of recirculating ball steering gear from this.

According to the invention, as the double-boosting mechanism of the booster A and the booster B is adopted on the recirculating ball steering gear body, when the output torque is lower, the booster A and the booster B share the output torque (two sets of boosters respectively share half of the output torque), so that the transmission ratio of the speed reducing mechanism can be reduced, and the overall dimension of the speed reducing mechanism is reduced; or the transmission ratio of the speed reducing mechanism is kept unchanged, the output torque requirement of the motor is reduced, and the cost and the overall dimension of the motor can be greatly reduced. When output torque is higher, booster A and booster B share the moment of torsion that worm wheel end bore (two sets of boosters respectively share half moment of torsion), avoid the problem that current nylon materials worm wheel can't bear great moment of torsion from this. And when the output torque is higher, the requirement of the transmission ratio of a single set of speed reducing mechanism can be reduced, the problem of the transmission ratio of an oversized speed reducing mechanism caused by the requirement of the output torque is avoided, the problem of large overall dimension caused by the transmission ratio of the oversized speed reducing mechanism and the problem of sacrificing the strength of the speed reducing mechanism for reducing the overall dimension are solved. Because the worm of the invention shares one worm wheel, one worm wheel part is reduced, the cost is saved, and the tail length of the shell of the recirculating ball steering gear assembly is reduced.