CN212047563U - Circulating ball type electric power steering gear - Google Patents

Abstract

The utility model relates to the technical field of steering equipment for vehicles, and provides a circulating ball type electric power steering gear, which comprises a mechanical steering gear, a speed reducer, an integrated motor controller and a sensor; the mechanical steering gear is provided with a steering gear shell and a steering screw rod, and the speed reducer is provided with a speed reducer shell; the steering gear shell and the speed reducer shell are fixed in a detachable connection mode; a steering input shaft and a worm wheel shaft are arranged in the speed reducer, and the steering input shaft and the worm wheel shaft are flexibly connected through an elastic torsion bar; and a sensor is arranged at the joint between the input end of the steering input shaft and the output end of the worm wheel shaft. The utility model discloses a but the sea pull torque sensor of simultaneous output torque signal and corner signal, the response is more sensitive, and the signal is more reliable and more stable.

Description

Circulating ball type electric power steering gear

Technical Field

The utility model relates to a technical field of steering equipment for the vehicle, specificly more relate to a circulation ball formula electric power steering ware.

Background

At present, the steering gear for the vehicle mainly adopts an electric power-assisted type, a pipe column type, a rack and pinion type and a circulating ball type. The electric power steering system mainly comprises a steering wheel torque sensor, a vehicle speed sensor, a controller, a power motor, a speed reducing mechanism and the like. The basic principle is that a controller receives a steering wheel torque signal, a vehicle speed signal and an engine signal, and outputs a control signal to control an electric motor to output power-assisted torque according to a predetermined power-assisted characteristic. The electric power steering system has many advantages of energy conservation, high safety performance, environmental protection and the like, and is one of the development directions of the future power steering technology, but the current electric power steering system has many problems: firstly, most of the electric power-assisted steering systems are only applied to cars and are tube column type or rack and pinion steering gears, the application range is narrow, the hydraulic power-assisted steering is still adopted for the special vehicle with the front axle more than 1.5t at present, the installation is complex, the energy loss is large, and particularly, the electric power-assisted steering systems are purely used for the new energy special vehicle; secondly, most of sensors adopted by the existing electric power steering gear are torque sensors only capable of outputting torque signals, and the system steering is not light and flexible enough, so that unmanned driving and auxiliary driving cannot be realized; thirdly, the speed reducer part and the mechanical circulating ball structure connecting mechanism are unreasonable in arrangement, so that the assembly is inconvenient and the product assembly is qualified and low.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a recirculating ball type electric power steering gear, which comprises a mechanical steering gear, a reducer, an integrated motor controller 26 and a sensor; the mechanical steering gear is provided with a steering gear shell 12 and a steering screw 15, and the speed reducer is provided with a speed reducer shell 6; the steering gear shell 12 and the speed reducer shell 6 are fixed in a detachable connection mode; a steering input shaft 1 and a worm wheel shaft 9 are arranged in the speed reducer, and the steering input shaft 1 is flexibly connected with the worm wheel shaft 9 through an elastic torsion bar 2; and a sensor is arranged at the joint between the input end of the steering input shaft 1 and the output end of the worm wheel shaft 9.

As a preferred technical solution, the sensor is a torsion-sea-pull sensor 4.

As a preferable technical solution, the mechanical steering gear further comprises a steering nut rack 13, a steering rocker shaft 19, and a steering screw 15; two ends of the steering screw rod 15 are horizontally arranged in the steering gear shell 12 through a second thrust ball bearing 16 and a first thrust ball bearing 11 respectively; a steering nut rack 13 is sleeved on the steering screw rod 15; the internal thread raceway of the steering nut rack 13 is connected with the external thread raceway of the steering screw 15 by a steel ball 14 and a steel ball guide pipe to form a steel ball circulating raceway 24, and a plurality of steel balls 14 are arranged in the steel ball circulating raceway 24; the rack outside the steering nut rack 13 is meshed with a sector gear of a steering rocker shaft 19 below the rack.

As a preferable technical scheme, the worm wheel shaft 9 and the steering screw rod 15 are connected through a spiral spline structure.

As a preferable technical solution, the speed reducer further comprises a worm wheel 8, a worm 7; two ends of the worm 7 are respectively installed inside the reducer casing 6 through a first ball bearing 31 and a second ball bearing 32; the worm 7 is meshed with a worm wheel 8 on a worm wheel shaft 9; a worm wheel 8 is arranged at the upper part of the worm wheel shaft 9 and the lower part of the sea pull torque sensor 4; and an involute gear of the worm wheel is in radial meshing connection with a module thread of the worm 7.

As a preferable technical scheme, the module of the rack outside the steering nut rack 13 and the sector gear of the steering rocker arm shaft 19 is 5.5-9.

As a preferable technical scheme, the diameter of the steel ball 14 is 7.5-8.5 mm.

As a preferable technical scheme, the worm gear and worm transmission ratio of the speed reducer is 18-23.

As a preferable technical scheme, a 4-phi 15 mounting hole is formed in the right side end face of the steering gear shell 12.

As a preferred technical scheme, the module of the worm 7 and the worm wheel is 1.75-3.25.

Electronic power assisted steering ware of circulation ball formula at the during operation, the steering wheel rotates, give steering input shaft input power, produce the corner between steering input shaft and the worm-gear shaft assembly, the torsion bar produces and twists reverse the deformation, torque signal and corner signal output that will produce and spread into the controller through sea pull torque sensor, come according to the control mode control motor work of setting for well by the controller, the power take off end of motor transmits power for worm and worm wheel in proper order, after once enlargiing through worm and worm wheel speed reduction, it rotates to drive the steering screw, the rotation of steering screw drives the steering nut rack of suit at its middle part and makes rectilinear movement, it rotates to drive the steering rocker arm axle by the steering nut rack again, output torque is through the secondary is enlargied, finally drive the steering rocker arm horizontal hunting through the steering shaft, output steering torque.

Compared with the prior art, the utility model discloses following excellent beneficial effect has:

1. the utility model discloses have and turn to lightly, nimble, initiatively return just, unmanned driving assists driving: the adoption can output torque signal and the sea pull torque sensor of corner signal simultaneously, the response is more sensitive, not only can realize initiatively returning to the positive, unmanned driving, and the supplementary driving guarantees the helping hand effect, and turn to lightly, nimble, feels smooth in succession moreover.

2. The utility model discloses it is simple, convenient assembling to have the mechanism: the worm wheel output shaft is connected with a screw rod of the circulating ball type mechanical steering gear through a spiral spline structure, ball bearings are arranged at the front and the rear of the worm wheel for supporting, a sensor penetrates through a main transmission shaft, the ball bearings are arranged at the front and the rear of the worm wheel for supporting, and thrust ball bearings are arranged at the front and the rear of the steering screw rod for supporting. The right end face of the steering gear shell is provided with a 4-phi 15 mounting hole. The installation on the frame is convenient, and the connecting size can be interchanged with the mechanical steering of the vehicle.

3. The utility model discloses have and reduce the energy consumption, pollution abatement: the adopted motor is a direct-current brushless motor, the output power is 850W, the output torque is 8N.m, and the rated voltage is 24V, so that the power loss of the engine is reduced, oil is saved, the pollution is reduced, and the low-temperature working performance of the steering system is also improved.

4. The utility model discloses it is high to have the sensor precision, and the interference killing feature is strong: the sensor adopts through hole type measurement, has high precision, directly measures the stroke of the torsion bar and the large torque measurement, and accurately measures the angle and the torque in a measuring range; the mechanical property is strong, and a simple and cost-advantageous press-fit process is adopted.

Drawings

Fig. 1 is a front view cross-sectional schematic view of a recirculating ball-type electric power steering gear.

Fig. 2 is a schematic side sectional view of the recirculating ball-type electric power steering gear.

Fig. 3 is a schematic half-sectional view of a top view of the recirculating ball-type electric power steering gear.

Wherein: 1-a steering input shaft; 2-torsion bar; 3-an upper cover assembly; 4-a hela sensor; 5-a sensor bearing sleeve; 6-reducer housing; 7-a worm; 8-a worm gear; 9-worm gear shaft; 10-a compression nut assembly; 11-a first thrust ball bearing; 12-a diverter housing; 13-steering nut rack; 14-steel balls; 15-a steering screw; 16-a second thrust ball bearing; 17-oil sealing; 18-needle bearings; 19-a steering rocker shaft; 20-a side cover assembly; 21-O-shaped ring; 22-flat washer; 23-hexagonal nut; 24-steel ball circulating raceway; 25-steel ball conduit clip; 26-an integrated motor controller; 27-connecting sleeves; 28-worm lock nut; 29-worm compression nut; 30-a retainer ring; 31-a first ball bearing; 32-second ball bearing.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a circulating ball type electric power steering gear, which comprises a mechanical steering gear, a speed reducer, an integrated motor controller 26 and a sensor; the mechanical steering gear is provided with a steering gear shell 12 and a steering screw 15, and the speed reducer is provided with a speed reducer shell 6; the steering gear shell 12 and the speed reducer shell 6 are fixed in a detachable connection mode; a steering input shaft 1 and a worm wheel shaft 9 are arranged in the speed reducer, and the steering input shaft 1 is flexibly connected with the worm wheel shaft 9 through an elastic torsion bar 2; and a sensor is arranged at the joint between the input end of the steering input shaft 1 and the output end of the worm wheel shaft 9.

In some embodiments, the sensor is a torsional hail torque sensor 4.

In some embodiments, the output torque signal of the hall torque sensor 4 is PWM, the duty ratio is 12.5% to 87.5%, and the rotational angle output is ± 720 °.

In some embodiments, the detachable connection is a bolt connection.

In some embodiments, the mechanical diverter further comprises a steering nut rack 13, a steering rocker shaft 19, a steering screw 15; two ends of the steering screw rod 15 are horizontally arranged in the steering gear shell 12 through a second thrust ball bearing 16 and a first thrust ball bearing 11 respectively; a steering nut rack 13 is sleeved on the steering screw rod 15; the internal thread raceway of the steering nut rack 13 is connected with the external thread raceway of the steering screw 15 by a steel ball 14 and a steel ball guide pipe to form a steel ball circulating raceway 24, and a plurality of steel balls 14 are arranged in the steel ball circulating raceway 24; the rack outside the steering nut rack 13 is meshed with a sector gear of a steering rocker shaft 19 below the rack.

In some embodiments, the steering nut rack 13 is provided with two identical sets of ball circulation raceways 24 side by side.

The utility model discloses in, steering nut rack set up two sets of steel ball circulation raceways, guaranteed mechanical strength, reliability and the security of steering gear.

In some embodiments, the worm gear shaft 9 and the steering screw 15 are connected by a spiral spline structure.

In some embodiments, the reducer further comprises a worm wheel 8, a worm 7; two ends of the worm 7 are respectively installed in the reducer casing 6 through a first ball bearing 31 and a second ball bearing 32; the worm 7 is meshed with a worm wheel 8 on a worm wheel shaft 9; a worm wheel 8 is arranged at the upper part of the worm wheel shaft 9 and the lower part of the sea pull torque sensor 4; and an involute gear of the worm wheel is in radial meshing connection with a module thread of the worm 7.

The utility model discloses in the reduction gear is worm gear reduction gear, installs in the reduction gear casing around first ball bearing 31 and second ball bearing 32 respectively about worm 7, and worm wheel shaft 9's upper portion, the lower part installation worm wheel of sea pull torque sensor 4, the involute gear of worm wheel are connected with the module screw thread radial meshing of worm 7, and the drive ratio of the worm gear in the casing is 20.5, connects integrative motor controller 26 through worm adapter sleeve 27.

The utility model discloses a circulation ball formula mechanical steering ware part include steering gear casing, steering nut rack, steering screw and steering rocker shaft, and the steering screw is left and right to be installed inside the steering gear casing through two thrust ball bearing levels respectively, and the steering nut rack is gone up the suit of steering screw, connects with steel ball and steel ball pipe between the external screw thread raceway of steering screw with the internal screw thread raceway of steering nut rack, forms steel ball circulation raceway, is equipped with a plurality of steel balls in the steel ball circulation raceway; the rack outside the steering nut rack is meshed with the sector gear of the steering rocker shaft below the rack; the speed reducer part comprises a speed reducer shell, a worm wheel shaft and a worm wheel, wherein the worm is arranged in the speed reducer shell from front to back through a ball bearing and meshed with the worm wheel on the worm wheel shaft, and a sensor rotor and a sensor stator are sleeved on the input shaft and the worm wheel shaft respectively and are welded firmly by a spot welding machine.

In some embodiments, the rack on the outside of the steering nut rack 13 and the sector gear of the steering rocker shaft 19 have a module of 5.5 to 9.

In some preferred embodiments, the modulus of the rack outside the steering nut rack 13 and the sector gear of the steering rocker shaft 19 is 7.5.

In some embodiments, the steel ball 14 has a diameter of 7.5-8.5 mm.

In some preferred embodiments, the steel ball 14 has a diameter of 7.938 mm.

In some embodiments, the worm gear ratio of the reducer is 18-23.

In some preferred embodiments, the worm gear ratio of the reducer is 20.5.

In some embodiments, the right side end face of the diverter housing 12 is provided with a 4-15 mounting hole.

The utility model discloses in, steering gear casing right side terminal surface on be equipped with 4-phi 15 mounting holes, the installation on the frame is very convenient, its connection size can turn to with vehicle machinery and exchange.

In some embodiments, the worm 7 and worm gear have a modulus of 1.75 to 3.25.

In some preferred embodiments, the module of the worm 7 and the worm wheel is 2.65.

In some embodiments, the number of heads of the worm 7 is 2, and the number of teeth of the worm gear is 41.

In some embodiments, the integrated motor controller 26 is a dc brushless motor, with an output power of 850w, an output torque of 8N · m, and a rated voltage of 24V.

In the utility model, the motor of the integrated motor controller is a DC brushless motor, the output power is 850w, the output torque is 8N.m, the rated voltage is 24V, and the power-assisted effect and the maximum output torque of the steering gear are ensured; and the installation position of the motor can be changed at will according to the actual needs of users.

In some embodiments, the steering rocker has a rotational angle of ± 45 °, a transmission ratio of 20.31, a total number of turns of 5.08 at the input, and a maximum output torque of 1600N · m.

The present invention is described in detail below by way of examples, which can only be used for further explanation of the present invention, but not for the limitation of the present invention, and the non-essential correction and adjustment made by the professional skilled in the art according to the contents of the above-mentioned utility model still belong to the protection scope of the present invention.

Example 1

A recirculating ball electric power steering gear, as shown in fig. 1, 2 and 3, comprises a mechanical steering gear, a speed reducer, the integrated motor controller 26 and a sensor; the mechanical steering gear is provided with a steering gear shell 12 and a steering screw 15, and the speed reducer is provided with a speed reducer shell 6; the steering gear shell 12 and the speed reducer shell 6 are fixed in a detachable connection mode; a steering input shaft 1 and a worm wheel shaft 9 are arranged in the speed reducer, and the steering input shaft 1 is flexibly connected with the worm wheel shaft 9 through an elastic torsion bar 2; and a sensor is arranged at the joint between the input end of the steering input shaft 1 and the output end of the worm wheel shaft 9.

The sensor is a sea pull torque sensor 4.

The output torque signal of the sea pull torque sensor 4 is PWM, the duty ratio is 12.5% -87.5%, and the rotation angle output is +/-720 degrees.

The steering nut rack 13 is provided with two groups of identical steel ball circulating raceways 24 in parallel.

The worm wheel shaft 9 and the steering screw rod 15 are connected through a spiral spline structure.

The speed reducer also comprises a worm wheel 8 and a worm 7; two ends of the worm 7 are respectively installed in the reducer casing 6 through a first ball bearing 31 and a second ball bearing 32; the worm 7 is meshed with a worm wheel 8 on a worm wheel shaft 9; a worm wheel 8 is arranged at the upper part of the worm wheel shaft 9 and the lower part of the sea pull torque sensor 4; and an involute gear of the worm wheel is in radial meshing connection with a module thread of the worm 7.

The modulus of the rack outside the steering nut rack 13 and the sector gear of the steering rocker shaft 19 is 7.5.

The steel ball 14 has a diameter of 7.938 mm. The worm gear and worm transmission ratio of the speed reducer is 20.5.

And a 4-phi 15 mounting hole is formed in the right side end face of the steering gear shell 12. The module of the worm 7 and the worm wheel is 2.65.

The number of the heads of the worm 7 is 2, and the number of the teeth of the worm is 41.

The motor of the integrated motor controller 26 is a dc brushless motor, the output power is 850w, the output torque is 8N · m, and the rated voltage is 24V.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (10)

1. A recirculating ball type electric power steering gear is characterized by comprising a mechanical steering gear, a speed reducer, an integrated motor controller (26) and a sensor; the mechanical steering gear is provided with a steering gear shell (12) and a steering screw rod (15), and the speed reducer is provided with a speed reducer shell (6); the steering gear shell (12) and the speed reducer shell (6) are fixed in a detachable connection mode; a steering input shaft (1) and a worm wheel shaft (9) are arranged in the speed reducer, and the steering input shaft (1) is flexibly connected with the worm wheel shaft (9) through an elastic torsion bar (2); a sensor is arranged at the joint between the input end of the steering input shaft (1) and the output end of the worm wheel shaft (9); the integrated motor controller (26) is in spline connection with the worm (7) through a connecting sleeve (27).

2. Recirculating ball electric power steering according to claim 1, characterized in that the sensor is a sea drag torque sensor (4).

3. The recirculating ball electric power steering gear according to claim 1, wherein the mechanical steering gear further comprises a steering nut rack (13), a steering rocker shaft (19), a steering screw (15); two ends of the steering screw rod (15) are horizontally arranged in the steering gear shell (12) through a second thrust ball bearing (16) and a first thrust ball bearing (11) respectively; a steering nut rack (13) is sleeved on the steering screw rod (15); the internal thread raceway of the steering nut rack (13) is connected with the external thread raceway of the steering screw (15) by a steel ball (14) and a steel ball guide pipe to form a steel ball circulating raceway (24), and a plurality of steel balls (14) are arranged in the steel ball circulating raceway (24); the rack on the outer side of the steering nut rack (13) is meshed with a sector gear of a steering rocker shaft (19) below the rack.

4. The recirculating ball electric power-assisted steering gear according to claim 3, characterized in that the worm-wheel shaft (9) and the steering screw (15) are connected by a spiral spline structure.

5. The recirculating ball electric power-assisted steering gear according to claim 2, characterized in that the reducer further comprises a worm wheel (8), a worm (7); two ends of the worm (7) are respectively installed in the reducer shell (6) through a first ball bearing (31) and a second ball bearing (32); the worm (7) is meshed with a worm wheel (8) on a worm wheel shaft (9); a worm wheel (8) is arranged on the upper part of the worm wheel shaft (9) and the lower part of the sea drag torque sensor (4); the involute gear of the worm wheel is in radial meshed connection with the module thread of the worm (7).

6. A recirculating ball electric power steering gear according to claim 3, wherein the rack outside the steering nut rack (13) and the sector gear of the steering rocker shaft (19) have a module of 5.5-9.

7. A recirculating ball electric power steering gear according to claim 3, characterized in that the steel ball (14) has a diameter of 7.5-8.5 mm.

8. The recirculating ball electric power steering gear of claim 5, wherein the worm gear-to-worm gear ratio of the speed reducer is 18-23.

9. A recirculating ball electric power steering gear according to claim 1, wherein the right side end face of the steering gear housing (12) is provided with a 4- Φ 15 mounting hole.

10. Recirculating ball electric power steering according to claim 5, wherein the worm (7) and the worm wheel have a modulus of 1.75-3.25.

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