• 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:
    The invention provides a control valve having a valve piston and coacting valve sleeve for flow control in booster power steering systems of the kind having a servo steering pump and a metering pump, especially as used in motor vehicles having power steering cylinders. The valve piston and valve sleeve have novel rings and grooves that effect a throttling flow control as the valve piston is shifted in steering, which substantially reduces vibration or chatter of the valve, permits ready return to neutral of the valve piston and the danger of cavitation in the power cylinder precluded. The dimensioning of special rings on the piston coacting with rings in the valve sleeve produces the advantages of the invention particularly when the valve is controlling high pressures. The arrangement effects a throttling of pressure flow from the metering pump to the power cylinder such that, when the valve piston is shifted for steering, low throttling is at first effected followed by high throttling as the valve piston moves to its fully shifted position, corresponding to initial low pressure in a power cylinder reaching high pressure in the course of power piston travel, as pressure flow is metered from the manually operated metering pump to the control valve.
    公开号:SU923358A3
    申请号:SU792724402
    申请日:1979-02-15
    公开日:1982-04-23
    发明作者:Фасбендер Рольф
    申请人:Цанрадфабрик Фридрихсхафен Аг (Инофирма)；
    IPC主号:
    专利说明:

    (5) DISTRIBUTIVE DEVICE FOR POWER STEERING VEHICLE
    I
    FIELD OF THE INVENTION The invention relates to vehicle engineering, in particular to vehicle steering control systems.
    It is known a switchgear for a hydraulic booster steering, vehicle control, "comprising a housing, a spool located inside it, mounted for movement in the housing and kinematically connected by one end to a movable element of a hand pump, and the other by a steering wheel, and there are several grooves connected by hydrolines to a hand pump, a hydraulic pump, cavities of an executive hydraulic cylinder and a hydraulic tank, while the grooves connected by hydrolines to a handheld The axle and the cavity of the actuating hydraulic cylinder are located in the said housing adjacent to each other and opposite the strings made on the til spool. However, the known switchgear does not provide the possibility of effective self-oscillation suppression and does not eliminate the danger of cavitation.
    The aim of the invention is to increase the efficiency of self-oscillation damping and eliminate the danger of cavitation.
    ten
    This goal is achieved by the fact that on the flanks adjacent to the last of the mentioned grooves, there are recesses with edges overlapping at one position of the spool with the corresponding cavity of the actuating hydraulic cylinder with the manual one. pumping and throttling fluid from a hand pump
    20 into the same cavity of the actuating cylinder at a different position of the spool, the width of said undercuts exceeding the distance between adjacent grooves. FIG. 1 is a diagram of a switchgear for a hydraulic booster steering system; in fig. 2 is a graph of the characteristics of throttling, according to the level of development of technology; in fig. 3 the same, according to the proposed device. The hand pump 1 is fixedly connected by means of a cardan shaft 2 with one end of the spool 3 of the distributor. The other end of the spindle 3 is provided with an inclined groove k. The steering shaft 5 mounted in the spool 3 of the distributor and having the possibility of rotation is provided with a radial pin 6 sliding in the inclined groove 4 of the spool 3 of the distributor. The steering shaft 5 is kinematically associated with a steering wheel (not shown). Since the steering shaft 5 is installed in the housing of the distributor stationary in the axial direction, when the shaft 5 is turned relative to the spool 3, the latter also makes a turn around the axis. A torsion bar (not shown) centers the valve 3 in a neutral position. - In addition, two check valves 7 and 8 are installed in the switchgear housing, which, with the occurrence of cavitation, allow to replenish with oil both the chambers of the hand pump 1 and the cavity of the actuating hydraulic cylinder. With the start of rotation, the steering shaft 5 is rotated with the help of a torsion bar relative to the spool 3 of the switchgear as a result of the overcoming torque of the hand pump 1. As a result, the switch 3 of the switchgear moves depending on the direction of the turn of the steering wheel left or right, resulting in the flow of hydraulic fluid from the hydraulic pump 9, intended for servo amplification, are throttled in the direction of the hydraulic tank. This causes an increase in pressure in the hydroline 10. At the same time, this pressure is transmitted through the bore 11 or 12 and the hydroline 13 or C to the corresponding receiving chamber of the manual pump 1. The discharge chamber of the manual pump 1 is connected to the corresponding cavity of the actuating hydraulic cylinder 15 9 4 through the bore 16 or 17 - The other cavity of the hydraulic actuator is connected through groove-18 or 19 with hydraulic tank 20. If, according to the level of development of the technology, the groove 16 or 17 would be made in the form of a chamfer, beveled edge or beveled ledge, x Characteristics of throttling on it would appear, respectively, in FIG. 2. At the same time, pressure is depicted on the y axis, on the positive x axis, the stroke of the spool 3 of the distributor to the right, and on the negative X axis, its path to the left. Beginning from the closed position of the groove 16, which is somewhat to the left of the neutral position of the gold 3, the throttling of the flow of working fluid falls (curve a). As a result, at the neutral position of the spool 3, throttling of the flow of the working fluid going through the groove 12, as well as damping, is high, and at the extreme position of the spool is low. Such a characteristic leads to the indicated disadvantages. The pressure equalization characteristic of the hydroline 10 of the hydraulic pump 9 is indicated by the curve b. If on the adjacent to the grooves 16 or 17 in sections 21 and 22, the grooves 23 and 2 are made, the flow of the working fluid at the neutral position of the spool 3 is throttled slightly. The damping (damping) of the oscillations is achieved with a corresponding axial movement of the spool 3 due to the fasciform protrusions in the form of notches 23 and whose width is greater than the distance between adjacent grooves in the housing. With this design, the throttling characteristic is obtained, respectively. 3 In the zone of the neutral position of the spool 3, the working fluid is practically not throttled, i.e. It does not make it difficult for the steering to automatically return to the forward position, and check valves 7 and 8 can be effective when cavitation arises in the actuating hydraulic cylinder. As the movement of the spool 3 increases, the throttling of the working fluid increases. Thus, the damping of vibrations becomes effective only in this position of the spool when they can actually occur.
    If the steering shaft 5 is rotated with respect to the spool 3. The spool 3, depending on the direction of rotation of the steering wheel, moves to the right or left in the axial direction. Due to this, the flow of the working fluid from the hydraulic pump 9 to the hydraulic tank 20 is closed and the pressure in the injection hydraulic line of the hydraulic pump 9 increases. At the same time, this pressure is through a groove 11 or 12, a hydroline 13 or is transmitted to the inlet of a manual suction 1. The outlet of a manual pump 1 through a groove 16 or 17 is connected to one cavity of an executive hydraulic cylinder 15, and its other cavity is connected through a groove 18 or 19 to a hydraulic tank 20.
    At the neutral position of the zolot 3, the flow of the working fluid flows almost unhindered. With the subsequent movement of the spool 3, the pressure of the working fluid increases, and the oscillation damping by throttling the flow of the working fluid is effective only in the position of the spool, in which these oscillations are actually possible.
    权利要求:
    Claims (1)
    [1]
    1. The patent of Germany V} ЦЪО (66, cl. 62 D 5/06, 1977 (prototype).
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    类似技术:
    公开号 | 公开日 | 专利标题
    US4420934A|1983-12-20|Automotive vehicle hydraulic system
    SU1077563A3|1984-02-29|Steering system of automobile vehicle
    US2063937A|1936-12-15|Fluid pressure actuator
    US5682744A|1997-11-04|Directional control valve in a full hydraulic type steering control system
    US4676334A|1987-06-30|Power steering system with hydraulic reaction
    US3481147A|1969-12-02|Hydraulic power system
    US4715464A|1987-12-29|Power steering system with hydraulic reaction
    SU923358A3|1982-04-23|Distributing arrangement for hydraulic booster for vehicle steering system
    GB953923A|1964-04-02|Improvements in or relating to hydraulic power steering apparatus for vehicles
    US4300594A|1981-11-17|Hydraulic rotary distributor, particularly for power steering mechanisms
    US4487281A|1984-12-11|Power-assisted rack-and-pinion steering mechanism
    US4303099A|1981-12-01|Device for hydraulically assisted steering
    US4616728A|1986-10-14|Power steering device
    US4261248A|1981-04-14|Auxiliary power steering system with relief valve control
    SU833151A3|1981-05-23|Hydraulic steering gear of transport device
    US3320745A|1967-05-23|Hydraulic steering control
    US3446021A|1969-05-27|Power steering unit with poppet directional control valves
    US5259474A|1993-11-09|Steering force control apparatus for power steering system
    EP0291992B1|1995-03-15|Flow control apparatus
    US4108273A|1978-08-22|Power assisted steering
    GB1006072A|1965-09-29|Power steering systems
    US5842538A|1998-12-01|Power steering control valve
    EP0728654A1|1996-08-28|Steering control valve with different size flow gaps for noise suppression
    GB354327A|1931-08-04|
    RU2143985C1|2000-01-10|Hydraulic steering mechanism and method of vehicle control
    同族专利:
    公开号 | 公开日
    IT7948049D0|1979-02-20|
    FR2418134A1|1979-09-21|
    DE2807464C2|1982-11-25|
    US4232584A|1980-11-11|
    RO77863A|1981-12-25|
    DE2807464A1|1979-08-23|
    FR2418134B1|1984-02-10|
    IT1115035B|1986-02-03|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2963316A|1958-11-24|1960-12-06|Gen Motors Corp|Backlite sunshade|
    US3119235A|1960-09-06|1964-01-28|Bendix Corp|Control valve|
    US3176721A|1963-10-04|1965-04-06|Clark Equipment Co|Hydraulic valve|
    GB1053199A|1964-09-21|1900-01-01|
    US3273468A|1965-01-26|1966-09-20|Fawick Corp|Hydraulic system with regenerative position|
    US3587235A|1969-06-02|1971-06-28|Trw Inc|Regenerative hydrostatic steering system|
    US3581771A|1969-10-22|1971-06-01|Garrison Mfg Co Inc|Power steering valve|
    DE2334365C3|1973-07-06|1980-03-20|Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen|Control valve|JPH0710650U|1993-07-26|1995-02-14|株式会社小松製作所|Directional control valve for all hydraulic steering system|
    US6769884B2|2000-12-11|2004-08-03|Cory L. Miller|Hydraulic drive system for piston pumps|
    WO2006048900A1|2004-11-08|2006-05-11|Duplomatic Oleodinamica S.P.A.|Load sensing directional hydraulic valve|
    WO2006111031A1|2005-04-20|2006-10-26|Bucher Hydraulics Ag|Pilot valve for a hydraulic motor|
    WO2013090728A2|2011-12-15|2013-06-20|Eaton Corporation|Flow directing spool for valve|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19782807464|DE2807464C2|1978-02-22|1978-02-22|Power steering|
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