Electric power steering device of new energy automobile

Abstract

The utility model discloses an electric power steering device of a new energy automobile, which relates to the technical field of resistance steering, and comprises a transmission box, a connecting rod is slidably connected in the transmission box, a rack is fixedly connected on the side wall of the connecting rod, a gear is rotatably connected on the inner wall of the transmission box, and the gear is rotatably connected on the inner wall of the transmission box. The surface of the connecting rod is in threaded connection with a threaded sleeve, the inner wall of the transmission box is rotationally connected with a rotating shaft, and the surface of the rotating shaft is in sliding connection with a transmission wheel. The device has the advantages that the limiting block is magnetically attracted to move through the electromagnetic attraction plate, so that the limiting block is clamped in the limiting groove, and the transmission wheel and the threaded sleeve can be limited; when the system is powered off, the electromagnetic suction plate cannot generate a magnetic field to attract the limiting block, the limiting block is retracted into the connecting plate under the elastic force of the spring, and at the moment, a user can drive the connecting rod to move only through mechanical transmission, so that the steering of the vehicle can be controlled without assistance.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance steering, in particular to an electric power steering device for a new energy vehicle. Background Art

[0002] The electric power steering system is a power steering system that directly relies on the motor to provide auxiliary torque. Compared with the traditional hydraulic power steering system (HPS), the EPS system has many advantages. It mainly consists of a torque sensor, a vehicle speed sensor, an electric motor, a reduction mechanism and an electronic control unit.

[0003] After searching, the applicant found that a Chinese patent disclosed "an electric power steering device for new energy electric vehicles", and its publication (announcement) number is "CN209581608U". This patent mainly uses a motor to drive the worm to rotate, and the worm assists the steering shaft through the rotation of the turbine. When the battery power is insufficient to start the motor, the self-locking nature between the turbine and the worm will make normal steering impossible. For this reason, we propose an electric power steering device for new energy vehicles. Utility Model Content

[0004] The purpose of the utility model is to provide an electric power steering device for new energy vehicles.

[0005] The transmission mechanism is connected with the gear train of claim 1, wherein the gear train is connected to the transmission mechanism, and the gear train is connected with the gear train by a threaded connection between the gear train and the transmission mechanism.

[0006] As a further solution of the present invention: a servo motor is fixedly connected to the side wall of the transmission box, and an output end of the servo motor passes through the inner wall of the transmission box and is fixedly connected to one end of the rotating shaft.

[0007] As a further solution of the present invention: the upper end surface of the transmission box is rotatably connected to a steering shaft, and the bottom end of the steering shaft passes through the inner wall of the transmission box and is fixedly connected to the center of the gear.

[0008] As a further solution of the present invention: the surface of the transmission wheel and the surface of the threaded sleeve are jointly connected by a synchronous belt.

[0009] As a further solution of the present invention: the surface of the gear is meshed with the surface of the rack.

[0010] As a further solution of the present invention: the shape of the inner wall of the transmission wheel matches the shape of the rotating shaft.

[0011] As a further solution of the present invention: the number of the connecting plates is set to two.

[0012] By adopting the above technical solution, compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The utility model uses an electromagnetic suction plate to move the limit block, causing the limit block to be stuck in the limit groove, which can limit the transmission wheel and the threaded sleeve. When the system is powered off, the electromagnetic suction plate cannot generate a magnetic field to attract the limit block, and the limit block is retracted into the connecting plate under the elastic force of the spring. At this time, the user can also drive the connecting rod to move by mechanical transmission alone, and control the steering of the vehicle without power assistance;

[0014] 2. The utility model drives the gear to rotate through the steering shaft. During rotation, the torque sensor can convert the torque into an electrical signal and transmit it to the servo motor to control the servo motor to work. The servo motor can drive the transmission wheel to rotate through the rotating shaft. The transmission wheel drives the threaded sleeve to rotate through the synchronous belt, and the threaded sleeve can assist the movement of the connecting rod.

[0015] Other advantages, objectives and features of the present invention will be described in part in the following description and will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the transmission box in an embodiment of the present utility model;

[0018] Figure 3 This is a schematic structural diagram of a connecting rod in an embodiment of the present utility model;

[0019] Figure 4 This is a structural diagram of a threaded sleeve in an embodiment of the present utility model;

[0020] Figure 5 This is a structural diagram of the connecting plate in an embodiment of the present utility model;

[0021] Figure 6 This is a schematic structural diagram of a limit block in an embodiment of the present utility model;

[0022] Figure 7 It is a schematic structural diagram of the limiting groove in an embodiment of the present utility model.

[0023] In the figure: 1. Transmission box; 2. Connecting rod; 3. Servo motor; 4. Steering shaft; 5. Gear; 6. Rack; 7. Rotating shaft; 8. Transmission wheel; 9. Synchronous belt; 10. Connecting plate; 11. Threaded sleeve; 12. Limit block; 13. Spring; 14. Limit slot; 15. Electromagnetic suction plate. DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0025] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Please see the attached Figure 1 -Attached Figure 7 The utility model is an electric power steering device for new energy vehicles, including a transmission box 1, a connecting rod 2 is slidably connected to the transmission box 1, a rack 6 is fixedly connected to the side wall of the connecting rod 2, a gear 5 is rotatably connected to the inner wall of the transmission box 1, a threaded sleeve 11 is threadedly connected to the surface of the connecting rod 2, a rotating shaft 7 is rotatably connected to the inner wall of the transmission box 1, a transmission wheel 8 is slidably connected to the surface of the rotating shaft 7, a connecting plate 10 is rotatably connected to the surface of the transmission wheel 8 together with the threaded sleeve 11, the inner wall of the connecting plate 10 is slidably connected to the limiting block 12, and the inner wall of the connecting plate 10 is fixedly connected to Spring 13, one end of the spring 13 is fixedly connected to the side wall of the limit block 12, a plurality of limit grooves 14 are opened at equal intervals on the inner wall of the transmission box 1, the inner wall of the transmission box 1 is fixedly connected with an electromagnetic suction plate 15, the side wall of the limit block 12 is snapped with the inner wall of the limit groove 14, the electromagnetic suction plate 15 is magnetically connected to the limit block 12, the surface of the transmission wheel 8 and the surface of the threaded sleeve 11 are jointly connected with the synchronous belt 9, the surface of the gear 5 is meshed with the surface of the rack 6, the shape of the inner wall of the transmission wheel 8 matches the shape of the rotating shaft 7, and the number of connecting plates 10 is set to two.

[0027] In the first embodiment, a servo motor 3 is fixedly connected to the side wall of the transmission box 1, and the output end of the servo motor 3 passes through the inner wall of the transmission box 1 and is fixedly connected to one end of the rotating shaft 7;

[0028] Specifically, during normal operation, the servo motor 3 can drive the transmission wheel 8 to rotate through the rotating shaft 7, and the transmission wheel 8 can drive the threaded sleeve 11 to rotate through the synchronous belt 9. When the threaded sleeve 11 rotates, it can drive the connecting rod 2 to move forward and backward, which can assist steering.

[0029] In the second embodiment, the upper end surface of the transmission box 1 is rotatably connected to the steering shaft 4, and the bottom end of the steering shaft 4 passes through the inner wall of the transmission box 1 and is fixedly connected to the center of the gear 5;

[0030] Specifically, the steering shaft 4 is connected to the steering wheel of the car through a universal shaft, and the steering shaft 4 can be driven to rotate when the user turns the steering wheel.

[0031] Working principle:

[0032] First, during normal operation, the steering wheel drives the steering shaft 4 to rotate through the universal joint, and the steering shaft 4 drives the rack 6 to move through the gear 5. The rack 6 can then control the steering of the wheels through the connecting rod 2. At the same time, the torque sensor on the steering shaft 4 can convert the torque into an electrical signal and transmit it to the servo motor 3. At this time, the servo motor 3 works to drive the rotating shaft 7 to rotate, and the rotating shaft 7 can drive the transmission wheel 8 to rotate. The transmission wheel 8 drives the threaded sleeve 11 to rotate through the synchronous belt 9. When the threaded sleeve 11 rotates, it can drive the connecting rod 2 to move, thereby assisting the vehicle steering. When the battery power is insufficient to drive the servo motor 3 and the electromagnetic suction plate 15 to work, the electromagnetic suction plate 15 is powered off and cannot drive the limit block 12 to be stuck in the limit groove 14. The limit block 12 will be retracted into the connecting plate 10 under the tension of the spring 13. At this time, the transmission wheel 8 can move freely on the surface of the rotating shaft 7. The user can also control the steering of the vehicle only through the transmission of the gear 5 and the rack 6. At this point, the entire workflow is completed.

[0033] The above-mentioned front, back, left, right, up and down are all based on the Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0035] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments.

[0036] For those skilled in the art, it is possible to make various changes, modifications, substitutions and variations to these embodiments without departing from the principles and spirit of the present invention, and they still fall within the scope of protection of the present invention.

Claims

1. An electric power steering device for a new energy vehicle, comprising a transmission box (1), characterized in that: The transmission box (1) is slidably connected to a connecting rod (2), a side wall of the connecting rod (2) is fixedly connected to a rack (6), an inner wall of the transmission box (1) is rotatably connected to a gear (5), a surface of the connecting rod (2) is threadedly connected to a threaded sleeve (11), an inner wall of the transmission box (1) is rotatably connected to a rotating shaft (7), a surface of the rotating shaft (7) is slidably connected to a transmission wheel (8), a connecting plate (10) is rotatably connected to the surface of the threaded sleeve (11) and the transmission wheel (8), and the connecting plate The inner wall of the connecting plate (10) is slidably connected to a limit block (12); the inner wall of the connecting plate (10) is fixedly connected to a spring (13); one end of the spring (13) is fixedly connected to the side wall of the limit block (12); the inner wall of the transmission box (1) is provided with a plurality of limit grooves (14) at equal intervals; the inner wall of the transmission box (1) is fixedly connected to an electromagnetic suction plate (15); the side wall of the limit block (12) is snap-fitted to the inner wall of the limit groove (14); and the electromagnetic suction plate (15) is magnetically connected to the limit block (12).

2. The electric power steering device for a new energy vehicle according to claim 1, characterized in that: A servo motor (3) is fixedly connected to the side wall of the transmission box (1), and an output end of the servo motor (3) passes through the inner wall of the transmission box (1) and is fixedly connected to one end of the rotating shaft (7).

3. The electric power steering device for a new energy vehicle according to claim 1, characterized in that: The upper end surface of the transmission box (1) is rotatably connected to a steering shaft (4), and the bottom end of the steering shaft (4) passes through the inner wall of the transmission box (1) and is fixedly connected to the center of the gear (5).

4. The electric power steering device for a new energy vehicle according to claim 1, characterized in that: The surface of the transmission wheel (8) and the surface of the threaded sleeve (11) are jointly connected by a synchronous belt (9).

5. The electric power steering device for a new energy vehicle according to claim 1, characterized in that: The surface of the gear (5) is meshed with the surface of the rack (6).

6. The electric power steering device for a new energy vehicle according to claim 1, characterized in that: The shape of the inner wall of the transmission wheel (8) matches the shape of the rotating shaft (7).

7. The electric power steering device for a new energy vehicle according to claim 1, characterized in that: The number of the connecting plates (10) is set to two.

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