• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reaction force control device of an electronically controlled power steering that assists steering force as a steering device of a vehicle. In particular, a reaction force plate and a reaction force piston are installed on an input shaft, and guide pins are formed around the reaction force piston to form a body. Combining and installing in the guide grooves to form a reaction chamber, and four V grooves in one reaction force piston to increase the lift according to the vehicle speed by using one reaction force piston to improve the steering stability and the number of parts The present invention relates to a reaction force device of an electronically controlled power steering, which can reduce the number of processes, improve manufacturability, reduce manufacturing cost, and improve the function and performance of the device.
    公开号:KR19980044709A
    申请号:KR1019960062829
    申请日:1996-12-07
    公开日:1998-09-05
    发明作者:변종식
    申请人:오상수；만도기계 주식회사；
    IPC主号:
    专利说明:

    Reaction device of electronically controlled power steering
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power steering apparatus for steering wheels for automobiles, and more particularly, to a power steering apparatus capable of obtaining a stable steering force during high speed and low speed driving of a vehicle.
    As is well known, the hydraulic power steering system (POWER STEERING SYSTEM) using the hydraulic actuator as a source of steering assistance force generally takes the following configuration. That is, when the output shaft connected to the steering wheel and the input shaft operatively connected to the handle are coaxially connected via the torsion bar and the steering torque is applied to the handle, the relative angular displacement between the input shaft and the output shaft depends on the torsion of the torsion bar. It is supposed to occur.
    In addition, a conventional power steering apparatus is provided with a hydraulic casing made of a cylindrical casing which rotates in conjunction with one of the input shaft and the output shaft and a valve made of coaxially installed therein and rotating in conjunction with the other shaft. By operating this hydraulic control valve, the supply hydraulic pressure of the hydraulic actuator is controlled according to the direction and magnitude of the steering torque to obtain steering assistance force.
    However, the magnitude of the force required for steering wheel steering corresponds to the magnitude of reaction force acting on the steering wheel from the road surface, and the magnitude of the reaction force is known to be proportional to the traveling speed of the vehicle.
    On the other hand, in the power steering apparatus of the above configuration, the correspondence between the steering torque applied to the handle and the steering assistance force generated by the hydraulic actuator is determined only by the torsion bar's torsion characteristic. Therefore, when the torsion bar is selected based on a large reaction force acting when stopped or at low speed, a weak reaction force acts on the steering wheel at high speed to cause deterioration of the straight stability.
    On the contrary, when the torsion bar is selected on the basis of high speed travel, a difficulty arises in that sufficient steering assist power cannot be obtained during stoppage and low speed travel.
    In order to solve this difficulty, a power steering apparatus has been developed in which a hydraulic reaction device is installed separately from a hydraulic control valve at a connection portion between the input shaft and the output shaft. By using this hydraulic reaction device, hydraulic reaction force proportional to the vehicle speed is applied to the power steering system, so that the control action of the hydraulic control valve according to the relative angular displacement of the input shaft and the output shaft is strong at high speed and weak at low speed. Will be bound by.
    However, in the related art, the hydraulic reaction apparatus includes a lower end of the input shaft 2, an upper end of the output shaft 3, and several plungers as shown in FIGS. 1 and 2.
    Between the output shaft 3 and the inner circumferential surface of the housing 10, a reaction force chamber 33 is formed in an annular space. A part of the input shaft 2 is inserted in the output shaft 3 so that a movement is possible, The outer peripheral surface is formed with the some recessed part 22 arrange | positioned at equal intervals in the circumferential direction. Moreover, the through-hole 31 which penetrated radially at the position corresponding to each said recessed part 22 is arrange | positioned in the output shaft 3 at substantially equal intervals in the circumferential direction. A corresponding plunger 32 is fitted in each of these through holes 31 so as to be slidable. Each plunger 32 has a hemispherical convex portion at its inner end, and the convex portion is engaged with the concave portion 22 formed on the outer circumferential surface of the input shaft 2.
    According to such a conventional hydraulic reaction device, by introducing the hydraulic pressure of the size corresponding to the vehicle speed into the reaction chamber 33, it is possible to improve the straight-line stability of the vehicle by imparting the appropriate rigidity to the steering wheel during high-speed driving, And a sufficient steering assist force at low speeds to reduce the force required for the steering wheel operation.
    As described above, in the conventional power steering device, a stopper device is provided between the hydraulic control valve and the hydraulic reaction device to enable manual steering when the torsion bar is broken apart from the hydraulic reaction device for applying the reaction force to the steering wheel. Therefore, the overall structure of the power steering system is complicated, and there are many defects in processing and manufacturing, and there are many contacts between the plunger of the output shaft and the concave portion of the input shaft. When the torsion bar is finely shaken when formed, etc. was caused.
    The present invention installs a reaction force plate and a reaction force piston in the input shaft to complement the conventional problems as described above, and form a guide pin around the reaction force piston to be installed in the guide groove formed in the body to form a reaction chamber In addition, by forming four V-grooves in the reaction force piston, one reaction force piston is used to increase hydraulic reaction force according to the vehicle speed, thereby improving the maneuverability while reducing the number of parts and the number of machining and improving the manufacturability and reducing the manufacturing cost. And to improve the functionality and performance of the device.
    1 is a system schematic diagram of an electronically controlled power steering apparatus to describe the prior art.
    2 is a cross-sectional view taken along the line AA of FIG. 1 (reaction device).
    3 is a system schematic diagram of an applied power steering apparatus of the present invention.
    4 is an enlarged cross-sectional view of the main portion of the present invention.
    5 is an enlarged cross-sectional view of the main portion of the present invention.
    * Explanation of symbols for main parts of the drawings
    1: input shaft, 2: reaction plate, 3: reaction piston, 4: guide pin, 5: body, 6: guide groove, 7: reaction chamber, 8: V-groove, 9: valve body, 10: pressure Control valve, 11: Solenoid, 12: ECU
    3 and 4, the reaction force piston 3 is installed in the valve body 9 forming the fixed pin reaction force plate 2 and the reaction chamber 7 on the input shaft 1. The guide pin (4) is formed around the reaction force piston (3) to be coupled to the guide groove (6) formed in the body (5) to form a reaction chamber (7), the one reaction force piston ( By forming four V-grooves (8) in 3), one reaction force piston (3) is used to increase the hydraulic reaction force according to the vehicle speed to achieve steering stability.
    Therefore, according to the present invention configured as described above, the ECU 12 controls the pressure control valve 10 by proportionally moving the solenoid 11 in response to the vehicle speed, and supplies a reaction force to the reaction chamber 7 as a reaction force piston 3. ) Is a device that is in close contact with the reaction plate (2) receives the reaction force to generate a reaction force during the rotation operation of the input shaft (1) to improve the steering stability according to the acceleration and deceleration of the vehicle.
    According to the present invention as described above, by using one reaction force piston 3 having four V-grooves, it is possible to increase the balance according to the vehicle speed, thereby achieving adjustment stability and smoothly operating the electronically controlled power steering. It is possible to reduce the number of parts and the number of machining, improve the workability and assemblability, reduce the manufacturing cost by reducing the number of parts and the number of machining, and prevent the malfunction of the device by easily maintaining the processing precision according to the dimensional tolerance. This will improve the car's functionality and performance.
    As described above, in the present invention, a reaction force plate and a reaction force piston are installed on an input shaft, and a guide pin is formed around the reaction force piston to be coupled to a guide groove formed in the body to form a reaction force chamber. By constructing four V-grooves on the reaction piston, one reaction force piston is used to increase the reaction force according to the speed of the vehicle to improve steering stability, while reducing the number of parts and the number of parts, improving the manufacturability and reducing the manufacturing cost. We wanted to get the effect of improving performance.
    权利要求:
    Claims (1)
    [1" claim-type="Currently amended] A reaction force piston (3) is installed in the valve body (9) forming the reaction force plate (2) fixed to the input shaft (1) and the reaction chamber (7), and a guide pin (4) around the reaction force piston (3). To form a reaction chamber (7) by coupling to the guide groove (6) formed in the body (5), and forming four V-grooves (8) in one reaction force piston (3) Reaction force of the electronically controlled power steering, characterized in that the reaction force piston (3) is used to increase the reaction force according to the vehicle speed to achieve adjustment stability.
    类似技术:
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    同族专利:
    公开号 | 公开日
    KR100215238B1|1999-08-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-12-07|Application filed by 오상수, 만도기계 주식회사
    1996-12-07|Priority to KR1019960062829A
    1998-09-05|Publication of KR19980044709A
    1999-08-16|Application granted
    1999-08-16|Publication of KR100215238B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960062829A|KR100215238B1|1996-12-07|1996-12-07|Reaction force device for electric controlled power steering systems|
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