Leveling system for vehicles
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0901066
(1992-06-19)
|
우선권정보 |
DE-4120489 (1991-06-21) |
발명자
/ 주소 |
- Gerdes Manfred (Korntal-Muenchingen DEX)
|
출원인 / 주소 |
- Robert Bosch GmbH (Stuttgart DEX 03)
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인용정보 |
피인용 횟수 :
3 인용 특허 :
6 |
초록
▼
A leveling system for vehicles has one pressure regulating valve for controlling each work cylinder disposed between the vehicle body and a wheel support, the work cylinder having a hydraulically controlled main valve and an electromagnetically controlled pilot valve. To avoid uncontrolled motion of
A leveling system for vehicles has one pressure regulating valve for controlling each work cylinder disposed between the vehicle body and a wheel support, the work cylinder having a hydraulically controlled main valve and an electromagnetically controlled pilot valve. To avoid uncontrolled motion of the vehicle body upon start-up, the pilot valve has a valve piston controlled by an electromagnet and acted upon in the valve closing direction by pressure in the control chamber of the main valve, which chamber communicates with a fluid source via a throttle, and in the valve opening direction by the pressure in the work cylinder. The valve piston has a valve seat, cooperating with a fixed valve member. The valve inlet of the pilot valve communicates with the control chamber, and its valve outlet communicates with a fluid tank. The main valve has three valve positions. One valve connection for the work cylinder is blocked or selectively communicates with the other valve connections for the fluid source and the fluid tank, respectively. A blockable valve device precedes the valve connection for the fluid tank. Both the fluid source and the fluid tank are assigned one further valve device each.
대표청구항
▼
A leveling system for vehicles having at least one pressure-fluid-actuated work cylinder (10) disposed between a vehicle body and a wheel support, said leveling system having a pressure fluid source (27) and a pressure fluid tank (28) respectively for supplying pressure fluid to and receiving pressu
A leveling system for vehicles having at least one pressure-fluid-actuated work cylinder (10) disposed between a vehicle body and a wheel support, said leveling system having a pressure fluid source (27) and a pressure fluid tank (28) respectively for supplying pressure fluid to and receiving pressure fluid from the work cylinder, and further having a pressure regulating valve (15) for controlling a flow of pressure fluid to and from the work cylinder, said pressure regulating valve including a main valve (16) with at least first, second, and third valve connections (A, P, T), the first valve connection (A) for connection to the work cylinder (10), the second valve connection (P) for connection to the pressure fluid source (27), and the third valve connection (T) for connection to the pressure fluid tank (28), respectively, further including a pressure-fluid-actuated control slide (20) for controlling the at least first, second, and third valve connections and a pilot valve (17), actuated by an electromagnet (50), said pilot valve provided with a controllable valve opening (38), said pilot valve being disposed between a valve inlet (36) and a valve outlet (35) for selectively controlling the control slide counter to a force of a first restoring spring (22) into at least first, second, and third slide positions, in said first slide position the work cylinder is blocked off, in said second slide position the work cylinder communicates with the pressure fluid source, and in said third slide position the work cylinder communicates with the pressure fluid tank, said control slide defining a control chamber (29) that communicates on one side via a throttle (31) with the second valve connection (P) for the pressure fluid source and on the other side with the valve inlet (36) of the pilot valve, the valve outlet (35) of said pilot valve being located at the pressure fluid tank, the controllable valve opening (38) being embodied in the cooperation between a valve piston (30) actuated by the electromagnet (50) and a spatially fixed valve member (39) of the pilot valve (17), the valve piston (30) being acted upon on one side in the valve opening direction by a first pressure prevailing at the first valve connection (A) for the work cylinder (10) and in the valve closing direction by a second pressure prevailing in the control chamber (29) of the main valve (16), a first control valve device (44) having a fourth valve connection (46) leading to the pressure fluid tank (28) precedes the third valve connection (T), wherein the valve outlet (35) communicates with the fourth valve connection (46), and a second control valve device (52) is provided between the pressure fluid source (27) and the second valve connection (P) of the main valve (16) and a third valve control device (45) is provided between the pressure fluid tank (28) and the fourth valve connection (46) leading to the first control valve device (44).
이 특허에 인용된 특허 (6)
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Kawabata Kazunobu (Fujisawa JPX), Active suspension system.
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Kawarasaki Yoshihiro (Kanagawa JPX), Actively controlled suspension system with improved layout of pressure control valve.
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Fukunaga Yukio (Kanagawa JPX), Hydraulic circuit for actively controlled automotive suspension system.
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Buma Shuuichi (Toyota JPX) Ohwa Nobutaka (Toyota JPX) Takeda Osamu (Susono JPX) Kamimae Hajime (Toyota JPX), Vehicle air suspension circuit with a changeover means and a low pressure reservoir that surrounds a high pressure reser.
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Tsukamoto Masahiro (Kanagawa JPX) Tsuchiya Hideki (Gifu JPX), Working fluid circuit for active suspension system with surge suppression during fail-safe mode operation.
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Takahashi Kenro (Kanagawa JPX), Working fluid circuit for automotive active suspension system with enhanced take-up characteristics upon initiation of o.
이 특허를 인용한 특허 (3)
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Miyajima, Junichi; Koyashiki, Hidehiko; Watanabe, Takatoshi, Control valve.
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Troy Eugene Schick ; Daniel Lee Dufner, Hydraulic circuit for active suspension system.
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Tsai Shan-Chin, Pressure reducing valve and continuously variable transmission with control arrangement using same.
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