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KR910021320A - Actuator for automotive anti-lock brake system - Google Patents

Actuator for automotive anti-lock brake system Download PDF

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Publication number
KR910021320A
KR910021320A KR1019910002759A KR910002759A KR910021320A KR 910021320 A KR910021320 A KR 910021320A KR 1019910002759 A KR1019910002759 A KR 1019910002759A KR 910002759 A KR910002759 A KR 910002759A KR 910021320 A KR910021320 A KR 910021320A
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KR
South Korea
Prior art keywords
piston
bushing
brake system
master cylinder
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
KR1019910002759A
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Korean (ko)
Inventor
바그너 빌프리트
쉴 로다르
뤼퍼 만프레트
융 크리스토프
Original Assignee
우.그라우, 페. 포르트비히
알프레드 테베스 게엠베하
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Publication of KR910021320A publication Critical patent/KR910021320A/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/44Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46Vacuum systems
    • B60T13/52Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/563Vacuum systems indirect, i.e. vacuum booster units with multiple booster units, e.g. tandem booster units
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46Vacuum systems
    • B60T13/52Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/565Vacuum systems indirect, i.e. vacuum booster units characterised by being associated with master cylinders, e.g. integrally formed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/44Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
    • B60T8/447Reducing the boost of the power-assist booster means to reduce brake pressure
    • B60T8/448Reducing the boost of the power-assist booster means to reduce brake pressure the power-assist booster means being a vacuum or compressed air booster
    • B60T8/449Reducing the boost of the power-assist booster means to reduce brake pressure the power-assist booster means being a vacuum or compressed air booster of the multiple booster type

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Braking Systems And Boosters (AREA)
  • Regulating Braking Force (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

내용 없음No content

Description

자동차 앤티록 브레이크 시스템용 작동유닛Actuator for automotive anti-lock brake system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명에 따른 작동유닛의 단면도.1 is a cross-sectional view of an operating unit according to the present invention.

Claims (17)

마스터 브레이트실린더 바람직하게는 탠덤 마스터 실린더를 구비하며, 이 텐덤 마스터 실린더에는 수압유체 공급탱크 및 입력부재수단에 의해 작동할 수 있는 진공브레이크 파워 부스터가 제공되며, 상기 탠덤 마스터 실린더의 주피스톤은 두부분으로 형상화되고, 그리고 외부피스톤과 거기에서 안내되는 내부 피스톤과 진공브레이크 파워 부스터의 하우징 내에는 파워쳄베로부터 진공쳄버를 분리하는 가동벽을 구비하며, 상기 진공브레이크 파워 부스터는 입력부재와 독립되어 이동될 수 있으며 수압챔버는 입력부재와 결합되어 작동될 수 있게 제공되어 입력부재와 함께 파워전달 결합부인 체결피스톤에 의해 형성되며, 수압유체공급 탱크와의 이러한 결합은 리테이닝 밸브와 내부피스톤과 상호 작용하는 조정밸브의 밸브피스톤에 의해 차단될 수 있고 입력부재를 조절하여 파워챔버를 여는 조작에 의해 차단되는 자동차용 앤티록 브레이크 시스템용 작동유닛에 있어서, 밸브피스톤(24)는 부스터하우징(10)의 마스터 실린더측부(48)에 구속되고 상기 외부피스톤(21)로 증가하는 파워의 전달이 조정하우징(12)에 있는 상기 밸브피스톤(24)와 동축상에 배열된 릴리프 부싱(31)에 의해 발생되어 수행되는 것을 특징으로 하는 자동차용 앤티록 브레이크 시스템용 작동유닛.Master brine cylinder preferably having a tandem master cylinder, which is provided with a vacuum brake power booster operable by a hydraulic fluid supply tank and an input member means, wherein the main piston of the tandem master cylinder is in two parts. Shaped and within the housing of the outer piston and the inner piston guided therein and the vacuum brake power booster there is a movable wall separating the vacuum chamber from the power chamber, the vacuum brake power booster being movable independently of the input member. The hydraulic chamber is provided to be operated in conjunction with the input member and is formed by a fastening piston, which is a power transmission coupling with the input member, and this coupling with the hydraulic fluid supply tank is coordinated with the retaining valve and the internal piston. Can be blocked by the valve piston of the valve In an operating unit for an anti-lock brake system for automobiles, which is blocked by an operation of opening the power chamber by adjusting the input member, the valve piston 24 is constrained to the master cylinder side 48 of the booster housing 10 and is externally provided. Anti-lock brake for automobiles, characterized in that the transfer of increasing power to the piston 21 is generated and carried out by a relief bushing 31 coaxially arranged with the valve piston 24 in the adjustment housing 12. Operating unit for the system. 제1항에 있어서, 상기 밸브피스톤(24)는 끼워넣는 방법으로 안내되는 2개의 부싱(25, 28)에 의해 구속되고, 여기에는 파워전달요소 (횡단핀(23))가 마련되어 이것을 상기 입력부재측 부싱(25)의 작은직경애의 단면(53)에서 한정된 범위로 이동될 수 있고 그리고 부싱의 축에 수직방향으로 배치되는 것을 특징으로 하는 자동차 앤티록 브레이트 시스템용 작동유닛.2. The valve piston (24) according to claim 1, wherein the valve piston (24) is constrained by two bushings (25, 28) guided by means of insertion, wherein a power transmission element (transverse pin (23)) is provided to the input member. An actuating unit for an automobile antilock brate system, characterized in that it can be moved in a defined range in a small diameter cross section (53) of the side bushing (25) and is disposed perpendicular to the axis of the bushing. 제2항에 있어서, 상기 단면(53)은 상기 체결피스톤(16)을 저지하는 방사상 환상 표면(54)에 의하여 이어지는 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.3. The actuating unit for an automobile anti-lock brake system according to claim 2, wherein the cross section (53) is connected by a radial annular surface (54) that blocks the fastening piston (16). 제2항 또는 제3항에 있어서, 상기 단면(53)은 상기 파워 전달 요소(23)을 관통하여 연장하는 두개의 방사방향으로 마주하고 세로인 슬롯(50)으로 형성되는 것을 특징으로 하는 자동차 앤트록 브레이크 시스템용 작동유닛.4. Vehicle ant according to claim 2 or 3, characterized in that the cross section (53) is formed of two radially opposite and longitudinal slots (50) extending through the power transmission element (23). Operating unit for the lock brake system. 제2항 내지 제4항중 어느 한항에 있어서, 상기 가동벽을 복원시키는 것을 마련하는 복원스프링과 상기 조정밸브를 수용하는 상기 조정하우징에 배치하는 상기 가동벽에 있어서, 상기 복원 스프링은 한쪽면은 상기 조정하우징(12)에 축방향으로 맞대어 인접하는 지지판(26)에 지지하고, 다른쪽면은 상기 마스터 실린더측 부싱(28)에 형성화된 환상 표면(55)에 지지하는 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.The restoring spring according to any one of claims 2 to 4, wherein the restoring spring has a restoring spring arranged to restor the movable wall, and the restoring spring arranged in the adjustment housing accommodating the adjustment valve. A vehicle anti-lock, characterized in that it is supported axially against the adjustment housing 12 and adjacent to the support plate 26, the other side of which is supported by an annular surface 55 formed on the master cylinder side bushing 28. Operating unit for the brake system. 제4항 또는 제5항에 있어서, 상기 세로슬릿(50)의 길이가 상기 지지판(26)과 상기 단면(53)의 단부 사이의 간격보다 큰 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.6. The operating unit for an automobile anti-lock brake system according to claim 4 or 5, wherein the length of the longitudinal slit (50) is greater than the distance between the support plate (26) and the end of the end face (53). 선행항 중 어느 한항에 있어서, 상기 릴리프 부싱(31)은 상기 릴리프 부싱(31)에 대하여 상기 밸브피스톤(24)을 축방향으로 한정된 이동을 제공하는 두개의 방사상으로 마주하는 슬롯(36)으로 형성하는 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.The relief bushing (31) according to any one of the preceding claims, wherein the relief bushing (31) is formed of two radially facing slots (36) providing axially defined movement of the valve piston (24) relative to the relief bushing (31). An operating unit for an automobile anti-lock brake system, characterized in that. 선행항 중 어떤 한 항에 있어서, 상기 릴리프 부싱(31)은 마스터 실린더측 단부는 블록한 만곡의 지지표면(56)과 상기 외부피스톤(21)의 단부에 형상화되고 오목한 만곡의 지지표면(57)이 맞물리게 비치되는 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.The curved support surface 57 according to any one of the preceding claims, wherein the relief bushing 31 is shaped and concave at the end of the outer piston 21 and the curved support surface 56 with the master cylinder side end blocked. Operating unit for an automobile anti-lock brake system, characterized in that it is interlocked. 선행항 중 어느 한 항에 있어서, 상기 밸브피스톤(24)는 상기 외부피스톤의내부공간을 돌출된 축방향 익스텐션(60)을 배치하며, 상기 내부피스톤(20)은 상기 외부피스톤(21)에 배치된 파워전달부싱(40)에 대해 근접됨에 따라 한정된 범위에서 이동될 수 있고 그리고 상기 외부피스톤(21)에에 지지되는 스프링(39)에 의해 미리 힘을 받게되고, 이것은 상기 익스텐션(60)의 단부로 부처 축방향에 배치되는 것을 특징으로 하는 액티록 브레이크 시스템용 작동유닛.The valve piston (24) according to any one of the preceding claims, wherein the valve piston (24) arranges the axial extension (60) protruding from the inner space of the outer piston, and the inner piston (20) is disposed on the outer piston (21). As it comes close to the power transmission bushing 40, it can be moved in a limited range and is pre-forced by a spring 39 supported on the outer piston 21, which is directed to the end of the extension 60. Actuating unit for the actilock brake system, characterized in that arranged in the axial direction. 선행항 중 어느 한항에 있어서, 시뮬레이터 스프링(35)는 상기 일차피스톤(19) 및 단부가 상기 입력부재측부싱(25)의 상기 환상표면(54)로 부터 축방향에 배치된 상기 체결피스톤(16)과 동축상으로 상기 마스터 실린더의 축방향 익스텐션(38)에 배치되는 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.The simulator spring (35) according to any one of the preceding claims, wherein the simulator spring (35) has the primary piston (19) and the fastening piston (16) disposed axially from the annular surface (54) of the input member side bushing (25). And an axial extension (38) of the master cylinder coaxially with). 제1항 내지 제10항중 어느 한항에 있어서, 상기 진공 브레이크 파워 부스터는 탠덤형식으로 설계되고, 하우징내에 두개의 공기 챔버는 가동벽에 의해 세분되고 격벽에 의해서 분할되는 진공챔버와 파워챔버에 있어서, 입력부재측 하우징부(49)는 두개의 상기 파워챔버(6, 46)에 연결되고 풍도구로 형성되며 상기 두개의 하우징부(48, 49)의 연결범위에 고정된 멈춤림(52)에 의하여 축방향으로 유지되고 지지되는 상기 격벽(41)에 방사상 웨브(58)을 비치하는 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.The vacuum chamber and the power chamber according to any one of claims 1 to 10, wherein the vacuum brake power booster is designed in tandem, and two air chambers in the housing are subdivided by movable walls and divided by partition walls. The input member side housing part 49 is connected to the two power chambers 6 and 46 and is formed by a wind blower, and is formed by a stop 52 fixed to the connection range of the two housing parts 48 and 49. And a radial web (58) in the partition wall (41) which is held and supported in a direction. 제5항에 있어서, 상기 지지판(26)은 상기 조정하우징(12)에 대하여 상기 밸브 피스톤(24)를 밀봉하기 위한, 바람직하게는 시일링컵인 시일(59)에 맞대어 인접한 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.6. The vehicle anti-entrance as claimed in claim 5, characterized in that the support plate (26) is adjacent to a seal (59), preferably a sealing cup, for sealing the valve piston (24) against the adjustment housing (12). Operating unit for the lock brake system. 선행항 중 어느 한 항에 있어서, 상기 조정하우징에 형상화된 제1밀봉시트(seat), 상기 밸브피스톤에 형상화된 제2밀봉시트 및 상기 두개의 밀봉시트와 서로 작용하는 탄성포핏밸브 몸체로 구성되는 상기 진공브레이크파워 부스터의 상기 조절밸브에 있어서, 상기 포핏밸브몸체(33)는 확실한 체결끼움 상태에서 상기 조정하우징(12)에 연결되는 포핏밸브홀더(32)에 의해 유지되는 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.An elastic poppet valve body according to any one of the preceding claims, comprising a first sealing seat shaped on the adjustment housing, a second sealing seat shaped on the valve piston, and an elastic poppet valve body interacting with the two sealing seats. In the control valve of the vacuum brake power booster, the poppet valve body 33 is held by a poppet valve holder 32 connected to the adjustment housing 12 in a securely fastened state. Operating unit for the lock brake system. 제13항에 있어서, 상기 포핏밸브몸체(33)의 고정범위에 있는 환상요소(68)은 상기 조정밸브(13)의 작동결과로 발생하는 상기 포핏밸브몸체(33)의 방사상 돌출을 제한하기 위하여 마련하는 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.14. An annular element (68) in the fixed range of the poppet valve body (33) is adapted to limit radial projection of the poppet valve body (33) as a result of the actuation of the regulating valve (13). An operating unit for an automobile anti-lock brake system, characterized in that the provision. 제13항에 있어서, 상기 포핏밸브홀더(32)는 상기 조정하우징(12)내에 형상화된 슬롯과 서로 작용하는 방사상 노치된 돌출부를 비치하는 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.14. The actuating unit of claim 13, wherein the poppet valve holder (32) has radially notched protrusions that interact with shaped slots in the adjustment housing (12). 선행항 중 어느 한항에 있어서, 상기 마스터 실린더측 하우징부(48)은 장부수단(51)에 의하여 확실한 체결끼움상태에서 유지되는 상기 마스터 실린더측 부싱(28)에 있고, 바람직하게는 관형 익스텐션(61)이 내부로 향하면서 축방향으로 형성되는 것을 특징으로 하는 자동차 앤티록 브레이크 시스템용 작동유닛.The master cylinder-side housing part 48 according to any one of the preceding claims, wherein the master cylinder-side housing part 48 is in the master cylinder-side bushing 28, which is held in a secure fastening state by the loading means 51, and preferably a tubular extension 61. ) Is an axial direction toward the inside of the operating unit for the vehicle anti-lock brake system. 선행항 중에 어느 한항에 있어서, 상기 마스터 실린더측 하우징부에 형상화된 기준표면과 진공 브레이크 파워 부스터 파워의 전달요소 단부 사이의 축방향에 있어서, (a) 상기 기준표면은 상기 마스터 브레이크 실린더(2)의 고정된 평면이고 상기 증가된 파워의 전달요소는 상기 릴리프 부싱(21)이며; (b) 상기 두개의 부싱(25, 28)중 하나는 다른 하나에 미끄러지고 상기 릴리프 부싱(31)과 동시에 상기 압력부재측 부싱(25)에 의하여 상기 밸브피스톤(24)의 상기 익스텐션(60)에 고정되면 상기 조정하우징(12)와 상기 마스터 실린더측 부싱(28) 사이에 상기 복원스프링(17)이 고정되며; (c) 상기 밸브피스톤(24)는 상기 조정밸브(13)의 상기 양쪽 밀봉 시트가 같은 평면에 배치되는 것과 같은 상기 조정하우징(12)에 배치되며; (d) 상기 마스터 실린더측 하우징부(48)은 상기 작동측정이 도달할 때까지 간격을 위하여 부싱(28)위로 이동되며; (e) 상기 마스터 실린더측 하우징부(48)의 상기 익스텐션(61)은 상기 부싱(28)에 장부촉 이음이 되는 것들이, 작동측정의 조절을 위한 과정인 것을 특징으로 하는 자동차 액티록 브레이크 시스템용 작동유닛.The method according to any one of the preceding claims, wherein in the axial direction between the reference surface shaped in the master cylinder side housing portion and the transfer element end of the vacuum brake power booster power, (a) the reference surface is the master brake cylinder (2). A fixed plane of and the increased power transmission element is the relief bushing (21); (iii) one of the two bushings 25, 28 slides on the other and the extension 60 of the valve piston 24 by the pressure member side bushing 25 simultaneously with the relief bushing 31. The restoring spring (17) is secured between the adjustment housing (12) and the master cylinder side bushing (28) when it is fixed to; (c) the valve piston 24 is arranged in the adjustment housing 12 such that both sealing seats of the adjustment valve 13 are arranged in the same plane; (d) the master cylinder side housing portion 48 is moved over the bushing 28 for spacing until the operation measurement is reached; (e) the extension 61 of the master cylinder side housing part 48 is a dowel joint to the bushing 28, the actuating for the automotive actilock brake system, characterized in that a process for adjusting the operation measurement. unit. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019910002759A 1990-02-22 1991-02-21 Actuator for automotive anti-lock brake system Withdrawn KR910021320A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4005584A DE4005584A1 (en) 1990-02-22 1990-02-22 ACTUATING UNIT FOR A BLOCK-PROOF MOTOR VEHICLE BRAKE SYSTEM
DE4005584.1 1990-02-22

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KR910021320A true KR910021320A (en) 1991-12-20

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KR1019910002759A Withdrawn KR910021320A (en) 1990-02-22 1991-02-21 Actuator for automotive anti-lock brake system

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JP (1) JPH04215557A (en)
KR (1) KR910021320A (en)
DE (1) DE4005584A1 (en)
FR (1) FR2658465A1 (en)
GB (1) GB2241293A (en)

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Publication number Publication date
GB2241293A (en) 1991-08-28
JPH04215557A (en) 1992-08-06
DE4005584A1 (en) 1991-09-05
FR2658465A1 (en) 1991-08-23
GB9024950D0 (en) 1991-01-02

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