CN206738479U - Using the magnetorheological steering damper of the new automobile of Transmission Mechanism of Planetary Gear System - Google Patents

Abstract

The utility model discloses a novel automobile magneto-rheological steering damper adopting a planetary gear train transmission mechanism, which mainly consists of a damper rotor, a damper cylinder, a damper stator, a damping shaft core, an excitation coil, a planetary gear train and bearings. and so on. The damper rotor rotates around the stator, and the planet carrier is connected to the steering output shaft; when the steering output shaft of the car rotates, it drives the planetary gear system and the damper rotor to rotate; the on-board controller receives signals from the car induction system to control the current of the steering damper excitation coil , when the excitation coil is energized, a magnetic field is generated in the channel through which the magneto-rheological fluid flows, forming a controllable damping force to hinder the rotation of the rotor; the rotor transmits the torque that hinders the rotation of the steering output shaft through the planetary gear train to achieve the purpose of vibration reduction. The planetary gear system can significantly increase the transmission ratio, thereby effectively increasing the torque of the damper, and there is no need to set up a torque amplification device, which reduces the system volume. The utility model is very suitable for being applied to the steering system of the automobile.

Description

A New Magneto-rheological Steering Damper Using a Planetary Gear Train

technical field

The utility model relates to a magnetorheological steering damper, in particular to a novel automobile magnetorheological steering damper adopting a planetary gear train transmission mechanism.

Background technique

With the rapid development of the automobile industry and the improvement of road traffic conditions, the design of automobiles is becoming more and more lightweight and high-speed. However, when the car runs at a high speed exceeding a certain critical speed or there is external interference (such as road bumps, wheel vibration, tread wear, etc.), the steering wheel will appear obvious turning motion and thug phenomenon, that is, the phenomenon of steering wheel shimmy, and this phenomenon has always existed. It is easy to make the driver fatigue, seriously affect the driving safety of the car, and it will cause the wear and tear of parts for a long time and reduce the service life of the car.

The advent of magnetorheological fluids has brought new ideas to solve the above problems. The rheological properties of magnetorheological fluids under the action of a magnetic field are instantaneously reversible, and the shear yield strength and magnetic field strength after rheology have a stable relationship. Correspondence. Under the action of a magnetic field, the yield strength of the magnetorheological fluid flowing through the flow channel changes, thereby outputting a damping force, and the shear yield strength of the magnetorheological fluid can be changed by controlling the magnetic field strength to realize a magnetorheological damper Stepless adjustment of output damping force.

Magnetorheological dampers provide resistance to motion and are used to dissipate motion energy. In its working range, it has the advantages of fast response, simple structure, small size, easy control and low energy consumption. It is an ideal vibration isolation and anti-seismic component, and it is widely used in construction, machinery, military industry, etc.

When the magnetorheological fluid damper is applied to the steering shaft of the automobile, it can effectively reduce the vibration. Therefore, designing a steering damper for suppressing the shimmy of the front wheel of the automobile has broad application prospects.

Contents of the invention

In order to overcome the problems in the background technology, the utility model provides a novel automobile magneto-rheological steering damper adopting a planetary gear train transmission mechanism to solve the shimmy phenomenon of the front wheel of the automobile. The torque generated by the magneto-rheological steering damper in the utility model can effectively reduce the steering speed of the steering system, thereby reducing vibration. The sensing system connected with the steering wheel can detect the movement state of the steering wheel, and generate a signal to transmit to the on-board controller. The on-board controller performs algorithm analysis and processing on this signal, and judges the driving state of the car at this time. According to the processing of the algorithm As a result, control signals are sent to the actuator and the magneto-rheological steering damper to control the movement of the actuator and adjust the magnitude and direction of the current in the excitation coil, thereby changing the torque generated in the steering damper. When the driver has no steering action, the steering shaft can obtain greater steering damping to reduce vehicle vibration; when the driver is turning, the steering shaft can obtain smaller steering damping so that the driver can perform steering actions more easily.

The technical solution adopted by the utility model to solve the technical problem includes: damper stator (1), left bearing (2), damper cylinder (3), damper rotor (4), sealing screw (5), excitation coil (6), damping shaft core (7), right bearing (8), shaft sleeve (9), planetary gear I (10), center wheel (11), damper end cover (12), output shaft bearing (13) , output shaft bearing end cover (14), steering output shaft (15), planetary carrier (16) and planetary gear II (17); the damper stator (1) and the left end of the damper shaft core (7) are respectively connected to the damper cylinder The body (3) is fastened and connected by screws; the stepped shaft part at the left end of the damper stator (1) is in interference fit with the inner ring of the left bearing (2), and the right end shaft of the damper stator (1) is in interference fit with the inner ring of the right bearing (8) fit; the outer surface of the circumference of both ends of the damper stator (1) is in clearance fit with the inner surface of the circumference of the damper rotor (4), and is sealed by a sealing ring; the outer surface of the middle circumference of the damper stator (1) is in contact with the damper rotor (4) ) is provided with a liquid flow channel with a radial clearance of 1mm on the inner surface of the middle circumference; the right end of the damper shaft core (7) is axially positioned through the shoulder of the damper stator (1), and the outer surface of the damper shaft core (7) is in contact with the damper stator ( 1) The inner surface is interference fit; the outer surface of the damper shaft core (7) is processed with a circular groove, and the excitation coil (6) is wound in the groove; the middle part of the damper cylinder (3) and the damper rotor (4) A circular through hole is processed for adding magnetorheological fluid, and the sealing screw (5) is fixedly connected with the damper rotor (4) by threads, and is sealed by a gasket; the inner surface of the left end of the damper rotor (4) is in contact with the left bearing (2) Outer ring interference fit; damper rotor (4) right end inner surface and right bearing (8) outer ring interference fit; damper rotor (4) outer surface and damper cylinder (3) inner surface clearance fit ; The left bearing (2) is axially positioned through the left shoulder of the damper stator (1) and the right shoulder of the damper rotor (4); the right bearing (8) is positioned through the right shoulder of the damper stator (1) and the circle The left end face of the nut is axially positioned; the center wheel (11) meshes with the planetary gear I (10) and the planetary gear II (17); the right end shaft of the damper rotor (4) performs circumferential positioning on the center wheel (11) through a key; the center The wheel (11) is axially positioned through the right end face of the shaft sleeve (9) and the left end face of the nut; the planetary gear I (10) and the planetary gear II (17) protrude from the shoulder of the shaft and the nut respectively through the left end of the planet carrier (16). The right end face is used for axial positioning; the shaft extending from the left end of the planet carrier (16) is used for circumferential positioning of planetary gear I (10) and planetary gear II (17) respectively through keys; the shaft sleeve (9) is passed through the damper rotor (4) The right end face of the right shoulder and the left end face of the center wheel (11) are axially positioned; the output shaft bearing (13) is axially positioned through the right end face of the planet carrier (16) and the output shaft bearing cover (14); the output shaft bearing end A circular through hole is processed in the middle of the cover (14), and the outer surface of the steering output shaft (15) is in clearance fit with the inner surface of the circular through hole of the output shaft bearing cover (14); the steering output shaft (15) is in contact with the output The inner ring of the shaft bearing (13) has an interference fit, and the left end of the steering output shaft (15) is fastened to the planet carrier (16) through threads; the output shaft bearing end cover (14) and the damper end cover (12) are fastened with screws Connect, the middle of damper end cover (12) is processed with circular through hole, its inner surface and output shaft bearing (13) outer ring interference fit.

Compared with the background technology, the utility model has the beneficial effects of:

(1) The response time of the magnetorheological steering damper of the utility model is shorter than that of ordinary hydraulic shock absorbers. Under the action of the control system, the magneto-rheological steering damper can quickly respond and generate torque to offset the deviation force of a part of the car when the tire blows out, and buy valuable time for the driver to operate correctly.

(2) At the same rotation speed of the steering output shaft, the transmission ratio can be significantly increased by adding the planetary gear train structure, thereby effectively increasing the torque of the steering damper without additional torque amplification devices, thereby reducing the system volume. Compact structure.

(3) Two identical planetary gears are used in the planetary gear train of the damper, which are evenly distributed around the center wheel. The inertial force of the planetary gear and the rotating arm balances each other, which makes the gear transmission stable, and also increases the number of teeth participating in the meshing. The ability to resist shock and vibration is enhanced, and the reliability of the system is improved.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of an automobile steering system applying the structure of the utility model.

detailed description

Fig. 1 is a schematic view of the structure of the utility model, including a damper stator (1), a left bearing (2), a damper cylinder (3), a damper rotor (4), a sealing screw (5), an excitation coil (6), Damping shaft core (7), right bearing (8), shaft sleeve (9), planetary gear I (10), center wheel (11), damper end cover (12), output shaft bearing (13), output shaft bearing End cover (14), steering output shaft (15), planetary carrier (16) and planetary gear (17);

Fig. 2 is the automobile steering system schematic diagram of application structure of the present utility model, comprises steering wheel (18), induction system (19), turns to input shaft (20), actuator (21), on-board controller (22), rack and pinion ( 23) and magnetorheological steering damper (24).

The working principle of the utility model is as follows:

When the automobile is running, the induction system (19) connected together with the steering input shaft (20) can detect the motion state of the steering wheel (18), and generate a signal that is transmitted to the on-board controller (22), and the on-board controller ( 22) Carry out algorithmic analysis and processing on this signal, judge the driving state of the vehicle at this time, send control signals to the actuator (21) and the magneto-rheological steering damper (24) according to the algorithm processing results, and control the movement of the actuator (21) and magneto-rheological steering damper (24) in the excitation coil current size. The actuator (21) drives the rack and pinion (23) to steer, and the magneto-rheological steering damper (24) produces steering damping of different sizes to the output shaft. When the driver keeps the state of the steering wheel (18) unchanged, the signal generated by the on-board controller (22) controls the excitation coil (6) to turn on the current, so that the magneto-rheological steering damper (24) produces a large torque, through Reduce the rotational speed of the steering system to control shimmy. When the driver changes the state of the steering wheel (18), the signal output by the on-board controller (22) controls the field coil (6) to cut off the current, and the steering output shaft (19) can obtain less steering damping, so that the driver can more easily perform steering action.

Claims (1)

1. A novel automobile magneto-rheological steering damper adopting a planetary gear train transmission mechanism is characterized in that it comprises: a damper stator (1), a left bearing (2), a damper cylinder block (3), a damper rotor ( 4), sealing screw (5), excitation coil (6), damping shaft core (7), right bearing (8), bushing (9), planetary gear Ⅰ (10), center wheel (11), damper end Cover (12), output shaft bearing (13), output shaft bearing cover (14), steering output shaft (15), planet carrier (16) and planetary gear II (17); damper stator (1) and damper shaft The left end of the core (7) is respectively fastened with the damper cylinder (3) by screws; the stepped shaft part at the left end of the damper stator (1) is interference fit with the inner ring of the left bearing (2), and the right end of the damper stator (1) The shaft is in interference fit with the inner ring of the right bearing (8); the outer surface of the circumference of both ends of the damper stator (1) is in clearance fit with the inner surface of the circumference of both ends of the damper rotor (4), and is sealed by a sealing ring; the damper stator (1) ) and the inner surface of the middle circumference of the damper rotor (4) are provided with a liquid flow channel with a radial clearance of 1 mm; the right end of the damper shaft core (7) is axially positioned through the shoulder of the damper stator (1), and the damper The outer surface of the core (7) is interference fit with the inner surface of the damper stator (1); the outer surface of the damper shaft core (7) is processed with a circular groove, and the excitation coil (6) is wound in the groove; the damper cylinder (3) and the middle part of the damper rotor (4) are processed with a circular through hole for adding magnetorheological fluid, and the sealing screw (5) is fixedly connected with the damper rotor (4) by threads and sealed by a gasket; damping The inner surface of the left end of the rotor (4) is interference fit with the outer ring of the left bearing (2); the inner surface of the right end of the damper rotor (4) is interference fit with the outer ring of the right bearing (8); the outer surface of the damper rotor (4) is in interference fit with The inner surface of the damper cylinder (3) is clearance fit; the left bearing (2) is positioned axially through the left shoulder of the damper stator (1) and the right shoulder of the damper rotor (4); the right bearing (8) is positioned through the damper The right shoulder of the stator (1) and the left end face of the round nut are axially positioned; the center wheel (11) meshes with the planetary gear I (10) and the planetary gear II (17); the right shaft of the damper rotor (4) passes through the key pair The center wheel (11) is positioned circumferentially; the center wheel (11) is axially positioned through the right end face of the bushing (9) and the left end face of the nut; the planetary gear I (10) and the planetary gear II (17) pass through the 16) The shaft shoulder of the shaft protruding from the left end and the right end face of the nut perform axial positioning; the shaft protruding from the left end of the planet carrier (16) performs circumferential positioning on the planetary gear I (10) and planetary gear II (17) respectively through keys; the shaft The sleeve (9) is positioned axially through the right end face of the right shoulder of the damper rotor (4) and the left end face of the center wheel (11); the output shaft bearing (13) is positioned through the right end face of the planet carrier (16) and the output shaft bearing end cover ( 14) Perform axial positioning; a circular through hole is processed in the middle of the output shaft bearing cover (14), and the outer surface of the steering output shaft (15) is in clearance fit with the inner surface of the circular through hole of the output shaft bearing cover (14) ;The steering output shaft (15) is in interference fit with the inner ring of the output shaft bearing (13), and the left end of the steering output shaft (15) is tightly connected with the planetary carrier (16) through threads; the output shaft bearing end cover (14) and the damper The end cover (12) is fastened and connected by screws, and a circular through hole is processed in the middle of the damper end cover (12), and its inner surface is in interference fit with the outer ring of the output shaft bearing (13).