Vehicle steering booster

FIELD: transport engineering.

SUBSTANCE: invention relates to servos of vehicle steering systems. Proposed steering booster has housing, steering shaft consisting of inlet and outlet parts, torsion bar connecting parts of steering shaft, drive, reduction gear with drive shaft and two opposite rotation toothed pairs with constant external meshing connected with output part of steering shaft for each direction of steering wheel turning through one of two clutches. Both parts of steering shaft are made in form of screw pair. Input part of steering shaft is made in form of screw, and its output shaft, in form of nut freely fitted in housing for axial displacement. Clutches are of friction type.

EFFECT: provision of stepless connection of drive to output part of steering shaft, improved reliability of steering booster.

6 cl, 1 dwg

 

The invention relates to servomechanisms steering of the vehicle, in particular a vehicle, and can be used as power steering.

A known power steering for vehicles, comprising a housing, the steering shaft from the input and output parts, torsion bar connecting portion of the steering shaft, the drive gear to the drive shaft and two gear pairs of counter-rotation with a constant outer toothed associated for each direction of rotation of the steering wheel through one of the two coupling with the output part of the steering shaft (German Patent (DE) No. 3612619, priority from 15.04.1986 year).

This power steering for vehicles allows the power from the continuously rotating motor that does not require stopping and subsequent reversal. And the change of the direction of rotation of the output shaft part is made with the help of the friction clutches.

However, the friction clutch of the power steering controlled by a special electronic unit, so this renowned the power steering does not have high reliability and require high maintenance.

The closest technical solution to the claimed is the power steering for vehicles, comprising a housing, the steering shaft from the input and output parts, torsion bar connecting portion of the steering shaft, the drive, ihusi the gearbox to the drive shaft and two gear pairs of counter-rotation with a constant outer toothed related for each direction of rotation of the steering wheel through one of the two coupling with the output part of the steering shaft (Tiled application Germany (DE) No. 19518196, priority from 22.05.1995 year).

This is the closest to the claimed invention, the power steering contains couplings made in the form of overrunning, built-in hub gears worm gear reduction gear that avoids the use of an electronic control unit couplings and, consequently, increases the reliability of power steering and does not require high maintenance.

The disadvantage of this is closest to the claimed power steering for vehicles is the use of overrunning clutches, non-smooth connection of the actuator to the output of the steering shaft, and a lack of reliability in vibration and shock, which can lead to unstable operation overrunning.

The invention solves the problem of increasing the reliability of power steering for cars.

The technical result achieved by the invention consists in providing a smooth connection of the drive amplifier to the output of the steering shaft.

This is achieved by the fact that the steering wheel for vehicles, comprising a housing, the steering shaft from the input and output parts, torsion bar connecting part rul the first shaft, the drive gear to the drive shaft and two gear pairs of counter-rotation with a constant outer toothed associated for each direction of rotation of the steering wheel through one of the two coupling with the output part of the steering shaft, the two parts of the steering shaft is made as a screw pair, and the input portion of the steering shaft is made in the form of a screw, and the output part is made in the form of nuts and freely installed in the housing for axial movement, and couplings made of friction.

The proposed construction of power steering for vehicles allows the use of friction clutches in various designs, including conical and disk, as well as gear pair of different designs, including cylindrical, bevel and worm.

The present invention is illustrated in the drawing, represented as a kinematic scheme.

Power steering for vehicles includes a housing 1; the steering shaft 2 from the input 3 and output 4 parts; the torsion bar 5 connecting parts 3 and 4 of the steering shaft 2; drive 6; reduction gear 7 to the drive shaft 8 and the two gear pairs of counter-rotation with a constant outer toothed consisting of gears 9 and received it engages two gears 10 and 11; and two friction clutches 12 and 13.

Both parts 3 and 4 of the steering shaft 2 are screw pair, if e is ω input part 3 is a screw, and the output part 4 is a nut with a closed end, which is fixed to one end of the torsion bar 5, the second end of which is fixed to the end of the input part 3, the steering shaft 2.

Each half of the two friction clutches 12 and 13 are rigidly connected with the output part of the steering shaft, and the other half of the two friction clutches 12 and 13 are mounted in the hub of gear wheels 10 and 11.

Power steering for cars works as follows.

The engine 6 is continuously rotates the gear 9, resulting in a counter rotation of the gears 10 and 11. In the absence of torque on the input part 3, the steering shaft 2 both clutches 12 and 13 are turned off by the torsion bar 5.

When there is torque on the input part 3, the steering shaft 2, i.e. by turning its screw 3, is moving on its helices another output portion 4 of the steering shaft 2, is made in the form of a nut which is moved to another half of one of the couplings 12 and 13, attached to it, with its second half, mounted in the hub of one of the gear wheels 10 or 11, as the result of this coupling is closed, connecting the drive shaft 8 of the motor 6 with the output part 4 of the steering shaft 2. After that torque from the engine 6 is transmitted to the rotating output portion 4 of the steering shaft 2, increasing its rotation. Thus, on the output side steering shaft 4 is summi the Finance two torque: one - from the input portion 3 of the steering shaft 2, the other from the engine 6.

When changing the direction of rotation of the input part 3, the steering shaft 2 is rotating screw steering shaft 2, leading to the separation of the included clutch 12 or 13 and the return of the torsion bar 5 parts 3 and 4 of the steering shaft 2 in a neutral position in which both clutches 12 and 13 are turned off, and the torque on the input and output parts of the steering shaft equal in magnitude and direction.

If torques on both parts of the steering shaft 2 are equal, the power steering is idle. But if torques on both parts of the steering shaft the same, then again moves the output portion 4 of the steering shaft 2 made in the form of nuts, until it stops with the corresponding half of one of the couplings 12 or 13, and again after that is the sum of the torques at the output of part 4 of the steering shaft 2 of the motor 6 and the input part 3, the steering shaft 2.

Thus, by performing parts of the steering shaft in the form of a screw, and use a friction coupling as couplings offer the design of the amplifier ensures a smooth connection of the actuator to the output of the steering shaft and thereby to improve the reliability of power steering for cars.

Conducted by the applicant Ana is from the prior art, including searching by the patent and scientific and technical information sources and identify sources that contain information about the analogues of the invention, has allowed to establish that the applicant had not discovered analogues characterized by signs of an identical all the essential features of the claimed invention.

The definition of the list of identified unique closest solutions has identified a set of essential, with respect to the apparent technical result of the distinctive features in the claimed power steering for vehicles set forth in the claims.

Therefore, the claimed invention “power steering for cars” meet the criterion of “novelty.”

The proposed power steering for vehicles with its new features is being prepared for use at the enterprise in the production of power steering for cars.

1. Power steering for vehicles, comprising a housing, the steering shaft from the input and output parts, torsion bar connecting portion of the steering shaft, the drive gear to the drive shaft and two gear pairs of counter-rotation with a constant outer toothed associated for each direction of rotation of the steering wheel through one of the two coupling with the output part of the steering shaft, characterized in that the two parts of the steering shaft done the us in the form of a coil pair, moreover, the input portion of the steering shaft is made in the form of a screw, and the output part is made in the form of nuts and freely installed in the housing for axial movement, and couplings made of friction.

2. Power steering for vehicles according to claim 1, characterized in that the coupling is made conical.

3. Power steering for vehicles according to claim 1, characterized in that the clutch is made of a disk.

4. Power steering for vehicles according to claim 1, characterized in that the toothed gear is cylindrical.

5. Power steering for vehicles according to claim 1, characterized in that the toothed gear is made conical.

6. Power steering for vehicles according to claim 1, characterized in that the gear pair made the worm.



 

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FIELD: transport engineering.

SUBSTANCE: invention relates to servos of vehicle steering systems. Proposed steering booster has housing, steering shaft consisting of inlet and outlet parts, torsion bar connecting parts of steering shaft, drive, reduction gear with drive shaft and two opposite rotation toothed pairs with constant external meshing connected with output part of steering shaft for each direction of steering wheel turning through one of two clutches. Both parts of steering shaft are made in form of screw pair. Input part of steering shaft is made in form of screw, and its output shaft, in form of nut freely fitted in housing for axial displacement. Clutches are of friction type.

EFFECT: provision of stepless connection of drive to output part of steering shaft, improved reliability of steering booster.

6 cl, 1 dwg

FIELD: transport engineering; automotive industry.

SUBSTANCE: invention can be used in production of new models of automobiles and modernization of existing models. Proposed steering column includes steering wheel, inlet shaft on which steering wheel is mounted, output shaft coupled with vehicle wheels and arranged coaxially with input shaft and torsion bar connected with adjacent ends of input and output shafts and installed to provide twisting at application of torque to inlet shaft. It contains also electric motor with stator and rotor, reduction gear by means of which electric motor is connected with output shaft, control unit to form and supply control signals, depending of angle of twisting of torsion bar, to electric motor which supplied additional torque to output shaft. Rotor of electric motor is arranged on output shaft coaxially with motor, and sum gear wheel of planetary reduction gear is connected with rotor of electric motor. Stationary central gear wheel is coupled with sun gear wheel by means of at least one planet pinion, and carrier is secured on output shaft and is in meshing with planet pinion.

EFFECT: compact design, energy saving, reliable steering column providing ease of steering.

7 cl, 2 dwg

FIELD: transport engineering; automotive and tractor industry.

SUBSTANCE: proposed steering column includes steering wheel. Ignition lock, input shaft on which steering wheel is installed, output shaft mechanically connected with vehicle wheels and torsion bar arranged coaxially with input shaft and connected with input and output shafts and installed so that when torque is applied to input shaft, torsion bar is twisted. Column contains also electric motor coupled with output shaft and provided with rotor, stator and housing, and control unit generating and supplying control signals, depending of angle of twisting of torsion bar, to electric motor which conveys additional torque to output shaft. Rotor of electric metro is installed on output shaft, and housing of electric motor is made to provide coaxial arrangement of input and output shafts. Torsion bar is furnished with torsion bar twisting angle limiter. Control unit is made for generating control signals depending additional on temperature of electric motor stator. Control unit contains control device generating control signals of steering column electric motor furnished with steering column shaft torque pickup. Said control device is made in from of microcontroller furnished additionally with electric motor stator temperature pickup being connected with semiconductor electric energy converter forming steering column electric motor current whose value is determined by said motor control signals.

EFFECT: provision of compact power- saving steering column with increased service life.

30 cl, 6 dwg

FIELD: automotive industry; steering systems of automobiles.

SUBSTANCE: invention is designed for reducing effort on steering wheel. Stator of electric motor is provided with magnetic circuit with n salient poles and rotor, with n-2 poles in form of permanent magnets. Three-phase winding of stator contains coils arranged in six equally alternating phase zones, one coil for pole, several coils belonging to one phase in each phase zone. Winding coils in phase zones belonging to one phase are connected In parallel aiding. Inlet and outlet shafts arranged in booster housing are interconnected by torsion bar being sensitive element of torque sensor and coupled with steering wheel and steering mechanism by other ends. Rotor of electric motor is installed on outlet shaft. Stator winding controllable supply, rotor position pickup and control unit are provided. Inputs of the latter are connected with outputs of torque sensor and rotor position pickup, and output is connected to control input of said supply source. Group if inventions makes it possible to improve manufacturability of electric motor and steering booster as a whole.

EFFECT: improved operating characteristics, safety and comfortability of steering.

5 cl, 3 dwg

FIELD: transport engineering.

SUBSTANCE: invention relates to components of electromechanical steering booster and it is designed for decreasing force on steering wheel when maneuvering at slow speed and turning wheels at standstill of vehicle. Base is used to fasten to rotor of electric motor. Signal processing microcircuit is arranged on one side of first printed-circuit board, and on other side, spring-loaded current collectors are installed. Metering unit is formed by torsion bar connecting output and input shafts of electromechanical steering booster and resistance strain gauge bridge. Metering unit has wire communication with signal processing microcircuit. Cylindrical case PLUS and MINIS supply terminals and output terminal of device. Second printed-circuit board is rigidly fastened by one side to flat surface of case, and by other side it contacts with current collectors of first printed-circuit board by conducting concentric paths on printed-circuit board connected with said terminals of case. Through holes for torsion bar are made in centers of base, first printed-circuit board, flat surface of case and second printed-circuit board. Base is provided with at least two catches at both sides of hole for torsion bar. First printed-circuit board is rigidly attached to base. Catches of base are designed for connection with case. Case, together with base, forms movable system executing axial rotation of base relative to case through unlimited angle. Invention simplifies design of sensor by excluding wiring board and liable to wear and ageing contact connection between first printed-circuit board and base. Moreover, sensor is insensible to large allowances in manufacture of parts.

EFFECT: improved operation reliability of sensor and entire electromechanical steering booster.

3 cl, 2 dwg

FIELD: transport engineering.

SUBSTANCE: invention relates to electromechanical systems of vehicles designed for steering gears to reduce control forces on steering wheel. Proposed device includes inverter connected with three-phase synchronous motor and microprocessor inverter control unit. Inputs of the latter are connected through interface units with electric motor rotor position, speed and through pickups and tachometer. Resistance current sensor in inverter supply circuit and inverter current metering unit are provided, output of the latter is connected directly with signal input of inverter control unit, and inverter temperature-sensitive element is provided being made in form of thermoresistor and connected to protective input of inverter control unit. Said units are arranged in housing provided with cover and installed in power compartment of automobile, being arranged on four-layer printed-circuit board fixed inside housing. Mounted on side of plate pointed to housing are heated current sensor, inverter temperature-sensitive element and power transistor module. These devices are potted with heat-conducting compound. Mounted on side of plate pointed to cover are other elements of inverter, inverter control unit, interface units, inverter supply control unit, inverter current metering unit and four connectors. Two connectors are designed to supply power from storage battery and to connect outputs of speed meter and tachometer to interface units, and two others are designed for taking off three phase voltage from inverter to electric motor and to connect signal and supply circuits of torque and electric motor rotor position pickups to interface units. Heavy current conductors are made in form of layer-by-layer paths of plate contacting in heat-conducting compound.

EFFECT: improved mass and dimensions characteristics, increased operation reliability.

2 cl, 4 dwg

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, particularly to electrical machines and can be used as a motor in steering wheel boosters of automobiles and low and medium power electric generators. To achieve this outcome, the proposed permanent magnet motor consists of a cylindrical ferromagnetic external rotor, comprising a shaft, a nonmagnetic disc on the shaft and a magnetically conductive cylinder, on the inner surface of which permanent magnets are placed parallel the axis of the rotor. The said motor also has a cylindrical inner stator, placed in line with the rotor. According to this invention, in the magnetic system of the rotor, magnets on the length of each pole are divided into two parts and displaced from each other around the rotor by an angle Δα/2, where Δα=360°/n, where n is the pulse number of magnetic flux in one cycle of the rotor.

EFFECT: easier control of the motor through reduction of tooth ripples of electromagnetic torque.

2 cl, 4 dwg

FIELD: mechanical engineering.

SUBSTANCE: invention relates to mechanisms of shafts locking for devices of steering control with electric drive. Shafts locking mechanism contains the first connecting frame, connected to rotating shaft, the second connecting frame, connected to steering shaft, operating as rotating shaft and couple of elements for rotation transfer. Mentioned couple of components, which is located between rotating shaft and steering shaft by means of both connecting frames, is provided for rotation transfer from rotating shaft to steering shaft. Couple of element for rotation transfer is adjusted so that they would develop retaliatory reaction in the form of strength of the first component, either in the form of resistance of both mentioned elements depending on value of relative rotation, which either less than fixed value, or equal or more than fixed value in the direction around axis between two rotating shafts. The second element for rotation transfer allows rigidity either less, or more, than rigidity of the first component, depending on value of relative rotation, which is either less, than fixed value, or equal or more, than fixed value in the direction around axis between two rotating shafts.

EFFECT: decision is directed to prevention of lost motion during prolonged period of time, increasing of mechanism wear resistance and improvement of manageability of car.

11 cl, 33 dwg

FIELD: automotive industry.

SUBSTANCE: in compliance with first and second versions, proposed device incorporates gadget determining turn angle, and gadget varying amplification factor to change feedback amplification factor. In compliance with second version, proposed device additionally comprises gadget to determine steering-wheel turning rate and amplification factor variation regulator. In compliance with third version, proposed device incorporates gadget to determine vehicle speed, that to determine steering wheel torque caused by steering wheel, gadget to determine motor purpose current, gadget to vary feedback amplification factor, and amplification factor variation regulator. In compliance with fourth and fifth versions, device includes gadget to determine steering wheel torque caused by steering wheel, that to determine vehicle speed, gadget to determine purpose regulation amount, gadget to determine steering-wheel turn angle, and gadget to vary feedback amplification factor. In compliance with fourth versions, device additionally comprises gadget to determine current variation rate. In compliance with fifth versions, device additionally comprises amplification factor variation regulator.

EFFECT: suppressing noise caused by operation of device facilitating steering.

13 cl, 33 dwg

FIELD: automotive industry.

SUBSTANCE: invention relates to automotive industry, particularly to steering systems. Steering device comprises actuator to boost steering made by steering wheel, steering wheel steering moment pickup, device to determine time of steering wheel back travel to boost steering during wheel back travel, device to control drive and actuator in response to time of wheel back travel determined by aforesaid device. Said time of wheel back travel decreases with increasing absolute steering moment determined by steering moment pickup.

EFFECT: improved steering on turning steering wheel.

6 cl, 5 dwg

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