Electric recirculating ball steering gear

Abstract

The utility model provides an electric recirculating ball steering gear which comprises a first motor and a first worm coaxially and fixedly connected with an output shaft of the first motor. A first input shaft is arranged on one side of the first worm, the upper portion of the first input shaft is fixedly sleeved with a first worm gear, and the first worm gear is meshed with the first worm. The lower end of the first input shaft is coaxially and fixedly connected with a first screw rod; and the lower part of the first screw rod rotationally enters the first nut. The device is large in output torque, and pure electric intelligent steering of the heavy-duty commercial vehicle can be achieved; in addition, the double-circulation ball type lead screw nut structure is convenient to machine and manufacture, low in cost, capable of achieving batch industrialization, high in transmission efficiency and beneficial to intelligent steering control. Due to the design of the two sets of electric control units of the electric recirculating ball steering gear, the design difficulty and the production and manufacturing difficulty of the electric control units can be reduced; the design of the two sets of electric control units can also realize a dual-redundancy function, and the security level is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of automobile power steering gear, especially relates to a kind of electric circulating ball steering gears. BACKGROUND

[0002] With the gradual popularization of new energy vehicles, circulating ball type electric steering gear is widely used in various commercial vehicles and passenger cars.Currently, circulating ball type electric steering gear has the following deficiencies in use: the existing electric steering gear main reducer part adopts circulating ball type screw nut structure, the torque capacity of this structure is limited, the current market structure limit can reach 4000-5000NM level, cannot meet the heavy load demand of medium and heavy commercial vehicles and some large passenger cars.

[0003] The planet roller screw of the prior art's roller screw type electric power steering gear is difficult to manufacture and has high cost;And the planet roller screw structure transmission efficiency is low, only about 60%, which is not conducive to intelligent steering control.In addition, the steering gear controller currently used on the market is mostly square plate type, occupies large space, and often interferes with the vehicle frame and other parts in vehicle matching application, causing application matching difficulty. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of electric circulating ball steering gear to solve the problems of low transmission efficiency and large space occupation of the automobile power steering gear in prior art.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions to achieve:

[0006] A kind of electric circulating ball steering gear, including first motor and the coaxial fixed connection of the output shaft of first motor with first worm;

[0007] The first input shaft is arranged on the side of the first worm, the first worm gear is fixedly sleeved on the upper part of the first input shaft, and the first worm gear is engaged with the first worm;The first screw rod is coaxially fixedly connected to the lower end of the first input shaft;The first screw rod is rotated into the first nut in the lower part;

[0008] The second nut is arranged on the side of the first nut, the first nut and the second nut are both provided with vertical tooth grooves on the side close to each other, the output shaft is arranged between the first nut and the second nut, the transmission gear is fixedly sleeved on the output shaft, and the transmission gear is engaged with the tooth grooves of the first nut and the second nut respectively;

[0009] The second nut is internally rotatably installed with a second screw rod, the upper portion of the second screw rod extends out of the upper end of the second nut and is coaxially fixedly connected with a second input shaft; a second worm wheel is fixedly sleeved on the upper portion of the second input shaft; a second motor is arranged on one side of the second input shaft, and the output shaft of the second motor is coaxially fixedly connected with a second worm; and the second worm is engaged with the second worm wheel.

[0010] The utility model still has the following characteristics:

[0011] Further, the output shaft of the first motor is coaxially fixedly connected with the first worm through a shaft coupling;

[0012] The output shaft of the second motor is coaxially fixedly connected with the second worm through a shaft coupling.

[0013] Further, a first controller is arranged on the first motor, and a first sensor is arranged on the first input shaft; the first controller is electrically connected with the first sensor;

[0014] A second controller is arranged on the second motor, and a second sensor is arranged on the second input shaft; the second controller is electrically connected with the second sensor.

[0015] Compared with the prior art, the utility model has the following technical effects:

[0016] (I) The electric circulating ball steering gear of the utility model has large output torque, can realize intelligent electric steering of heavy commercial vehicles, and has the advantages of convenient processing and manufacturing, low cost, high transmission efficiency, and high safety level.

[0017] The electric circulating ball steering gear of the utility model adopts a round plate cylinder type controller, has compact structure and high space utilization rate compared with a square plate type controller, and is beneficial to vehicle arrangement.

[0018] (II) The design of the two sets of electric control units of the electric circulating ball steering gear can reduce the design and manufacturing difficulty of the electric control units; the design of the two sets of electric control units can also realize double redundancy function, has high safety level, and is suitable for large-scale use and popularization in industry. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the overall structure schematic view of the electric circulating ball steering gear of the utility model;

[0020] Figure 2 is the top view of the electric circulating ball steering gear of the utility model;

[0021] Figure 3 is the front view of the electric circulating ball steering gear of the utility model;

[0022] Figure 4 It is the electric circulating ball steering part section structure schematic diagram of the utility model.

[0023] The meaning of each reference numeral in the figure is as follows:

[0024] 1, first motor; 2, first worm; 3, first input shaft; 4, first worm gear; 5, first screw rod; 6, first nut; 7, second nut; 8, output shaft; 9, second screw rod; 10, second input shaft; 11, second worm gear; 12, second motor; 13, second worm; 14, first controller; 15, first sensor; 16, second controller; 17, second sensor. DETAILED DESCRIPTION

[0025] It should be noted that all components in the utility model, such as no special instructions, all adopt the components known in the prior art. For example, the controller and the sensor adopt the known commonly used controller and sensor.

[0026] The following gives the specific embodiment of the utility model, it should be noted that the utility model is not limited to the following specific embodiments, and any equivalent transformation made on the basis of the technical solutions of the present application falls within the scope of protection of the utility model.

[0027] An electric circulating ball steering device, characterized in that comprising a first motor 1, the output shaft of the first motor is coaxially fixedly connected with a first worm 2;

[0028] A first input shaft 3 is arranged on one side of the first worm 2, a first worm gear 4 is fixedly sleeved on the upper part of the first input shaft 3, and the first worm gear 4 is engaged with the first worm 2; the first input shaft 3 is coaxially fixedly connected with a first screw rod 5 at the lower end; the first screw rod 5 is rotatably arranged into a first nut 6 at the lower part;

[0029] A second nut 7 is arranged on one side of the first nut 6, vertical tooth grooves are formed on the side close to each other of the first nut 6 and the second nut 7, an output shaft 8 is arranged between the first nut 6 and the second nut 7, a transmission gear is fixedly sleeved on the output shaft 8, and the transmission gear is engaged with the tooth grooves of the first nut 6 and the second nut 7 respectively; the output shaft 8 is used for outputting torque to external components.

[0030] A second screw rod 9 is rotatably installed in the second nut 7, the second screw rod 9 is coaxially fixedly connected with a second input shaft 10 after extending out of the upper end of the second nut 7; a second worm gear 11 is fixedly sleeved on the upper part of the second input shaft 10; a second motor 12 is arranged on one side of the second input shaft 10, the output shaft of the second motor 12 is coaxially fixedly connected with a second worm 13, and the second worm 13 is engaged with the second worm gear 11.

[0031] As a preferred solution, the first motor 1 output shaft is coaxially fixedly connected with the first worm 2 through a shaft coupling;

[0032] The second motor 12 output shaft is coaxially fixedly connected with the second worm 13 through a shaft coupling.

[0033] As a preferred solution, the first motor 1 is provided with a first controller 14, and the first input shaft 3 is provided with a first sensor 15; the first controller 14 is electrically connected with the first sensor 15;

[0034] The second motor 12 is provided with a second controller 16, and the second input shaft 10 is provided with a second sensor 17; the second controller 16 is electrically connected with the second sensor 17.

[0035] Among them, the first sensor 15, the first controller 14, the second controller 16, and the second sensor 17 all use known existing controllers and sensors, and the control and communication of the controller and the sensor are all in the known existing algorithm, which does not contain improvement for the algorithm. Those skilled in the art have the ability to select the corresponding type of controller and sensor according to the actual needs.

[0036] In use, the first input shaft 3 is connected with the steering wheel through the steering control mechanism, when the hand turns the steering wheel, the first sensor 15 installed on the first input shaft 3 recognizes the torque signal and the rotation angle signal, the first sensor 15 synchronously transmits the torque signal and the rotation angle signal to the first controller 14 and the second sensor, the second sensor transmits the signal to the second controller 16, the first controller 14 controls the first motor 1 to rotate a certain angle and output torque, and the second controller 16 controls the second motor 12 to rotate a certain angle and output torque.

[0037] The first motor 1 drives the first lead screw 5 through the shaft coupling, the first lead screw 5 drives the first nut 6 to displace, and the first nut 6 drives the output shaft to rotate and outputs torque through the meshing of the rack part and the output shaft gear part. The working principle of the second motor 12 is the same, which also drives the output shaft to rotate and outputs torque.

[0038] The first lead screw 5 and the second lead screw 9 can rotate in the same direction synchronously, only need to set the first lead screw 5 nut structure and the second lead screw 9 nut structure to be different in left and right rotation direction, that is, if the first lead screw 5 nut is set to left rotation, the second lead screw 9 nut is set to right rotation, and vice versa, which can ensure that the two groups of lead screw nut structures drive the output shaft synchronously.

[0039] The first screw rod 5 and the second screw rod can also be controlled by the respective controllers to reversely rotate the two groups of motors, so that the two groups of screw rod nut structures are arranged in the same rotation direction, so that the two groups of screw rod nut structures can also be guaranteed to synchronously drive the output shaft together. The two groups of motors are the first motor 1 and the second motor 12; the two groups of screw rods are the first screw rod 5 and the second screw rod 9; and the two groups of screw rod nuts are the first nut 6 and the second nut 7.

[0040] The two groups of motors jointly act to output torque together through a worm gear deceleration, screw rod nut and gear rack deceleration mechanism, so as to realize heavy load and large torque output requirements.

[0041] The electric circulating ball steering gear is a double circulating ball structure, the circulating ball screw nut structure is mature, and can be processed and manufactured by using mature processing and manufacturing means, is convenient to process and manufacture, has low cost, and can realize batch industrialization. The circulating ball screw nut structure has high transmission efficiency, generally more than 90%, and is beneficial to intelligent steering control.

[0042] At present, the structure has been used in a company, and is equipped with a round plate cylinder type controller. Compared with a square plate type controller, the structure is compact, has high space utilization, and is beneficial to vehicle arrangement.

[0043] The design of the two sets of electric control units can reduce the design difficulty and production and manufacturing difficulty of the electric control units. After the mechanical deceleration transmission part is determined, the deceleration ratio is determined, and the required input torque is also determined. The design of the two sets of electric control units can share the input torque requirement, the motor torque can be reduced, the controller working voltage and current can be adjusted accordingly, the design is easier, and the cost can also be controlled.

[0044] The design of the two sets of electric control units can realize double redundancy function and high safety level. When one set of electric control units fails, the other set of electric control units can quickly intervene to realize the steering control function.

[0045] The electric control unit can be further expanded according to needs, and can be arranged as three motors or four motors and different configurations according to needs. Meanwhile, the electric control unit can also be arranged in different directions on the basis of the display structure, that is, the electric control unit is arranged in the opposite direction of the output shaft; the electric control unit can be arranged below the screw rod nut; and the electric control unit can be arranged by rotating the screw rod by a certain angle. All the deformations based on the scheme shall belong to the protection range of the patent.

Claims

1. An electrically powered recirculating ball steering gear characterized by, The first motor (1) and the first worm (2) coaxially fixedly connected with the output shaft of the first motor (1) are included. The first input shaft (3) is arranged on one side of the first worm (2), the first worm (2) is engaged with the first worm (2), the first input shaft (3) is coaxially fixedly connected with the first screw rod (5) at the lower end, the first screw rod (5) is rotatably arranged into the first nut (6) at the lower part, the first nut (6) is arranged on one side of the second nut (7), the first nut (6) and the second nut (7) are arranged on one side of the first nut (6) and the second nut (7) respectively, the output shaft (8) is arranged between the first nut (6) and the second nut (7), the transmission gear is fixedly sleeved on the output shaft (8), and the transmission gear is engaged with the tooth groove of the first nut (6) and the second nut (7) respectively. The second screw rod (9) is rotatably arranged in the second nut (7), the second input shaft (10) is coaxially fixedly connected with the second screw rod (9) and arranged on the upper end of the second nut (7), the second input shaft (10) is fixedly sleeved with the second worm (11) at the upper part, the second motor (12) is arranged on one side of the second input shaft (10), the output shaft of the second motor (12) is coaxially fixedly connected with the second worm (13), and the second worm (13) is engaged with the second worm (11). The output shaft of the first motor (1) is coaxially fixedly connected with the first worm (2) through the shaft coupling.

2. The electrically powered circulating ball steering gear of claim 1 wherein, The output shaft of the second motor (12) is coaxially fixedly connected with the second worm (13) through the shaft coupling. The first controller (14) is arranged on the first motor (1), the first sensor (15) is arranged on the first input shaft (3), the first controller (14) is electrically connected with the first sensor (15), the second controller (16) is arranged on the second motor (12), the second sensor (17) is arranged on the second input shaft (10), and the second controller (16) is electrically connected with the second sensor (17).

3. The electrically powered circulating ball steering gear of claim 1 wherein, The first controller (14) is arranged on the first motor (1), the first sensor (15) is arranged on the first input shaft (3), the first controller (14) is electrically connected with the first sensor (15), the second controller (16) is arranged on the second motor (12), the second sensor (17) is arranged on the second input shaft (10), and the second controller (16) is electrically connected with the second sensor (17). ​

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