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| Number | Title | Issue Date |
| 7404382 | Variable engine valve control system with pressure difference A kind of variable engine valve control system with pressure difference comprises hydraulic supply equipment, hydraulic actuator apparatus, valve and spring controlling piston balance. The hydraulic actuator comprises hydraulic cylinder, piston and piston rod. The p... | 07/29/2008 |
| 7347753 | Hydraulic actuation system for a marine propulsion device A hydraulic system for a sterndrive marine propulsion device directs the flow of hydraulic fluid through the body and peripheral components of a gimbal ring in order to reduce the number and length of flexible hydraulic conduits necessary to conduct pressurized hydr... | 03/25/2008 |
| 7341028 | Hydraulic valve actuation systems and methods to provide multiple lifts for one or more engine air valves Hydraulic valve actuation systems and methods to provide multiple lifts for engine valves using fixed or hard stops at each lift. The fixed or hard stops provide a very repeatable selection of engine valve lifts dependent on engine operating conditions. For full val... | 03/11/2008 |
| 7121089 | Hydraulic cylinder In a hydraulic cylinder having a shock absorbing function, and capable of stopping as desired by an accumulator disposed within a cylinder rod. The accumulator includes an accumulator piston that divides the cylinder rod interior into first and second cylinder rod c... | 10/17/2006 |
| 7063200 | Pulsation dampening apparatus and clutch master cylinder A pulsation dampening apparatus and a clutch master cylinder used for a hydraulic clutch operation system which has a hydraulic circuit. The apparatus has a housing which has a dampening chamber in the hydraulic circuit and a dampening assembly accommodated in the h... | 06/20/2006 |
| 6595105 | Reciprocating compressor Reciprocating compressor including a connecting rod for converting a rotating movement of a crank shaft into a linear reciprocating movement, a piston for making a linear reciprocating movement inside of a cylinder block by the connecting rod, and resonat... | 07/22/2003 |
| 6584885 | Variable lift actuator An actuator comprises a cylinder, a first, second and third port, an actuation piston, a control piston and a control spring. The cylinder defines a longitudinal axis and comprises a first and second end. The first port communicates with the first end of ... | 07/01/2003 |
| 5878578 | Hydraulic pressure generator with vibration damping A hydraulic pressure generator having a body (1) with a first bore (11) therein for receiving a cylinder (21) of a piston assembly (2) to define a pressure chamber (12). The cylinder (21) has a second bore (211) for receiving an auxiliary piston (22) whic... | 03/09/1999 |
| 5816046 | Method of supressing vibrations of an actuation element of a hydraulic force transmission apparatus and auxiliary vibrator for carrying out the method A method of suppressing vibrations of an actuation element of a hydraulic force transmission apparatus, especially a hydraulic clutch actuation system in an automobile, and an auxiliary vibrator for carrying out the method, are disclosed. The force transm... | 10/06/1998 |
| 5410947 | Volume-compensated low-wear reciprocating seal assemblies A fluid-powered actuator (42) has a body (11) which includes an end wall (16) provided with a through-opening (21). A piston rod (44) has an inner portion (44A) arranged on one side of the end wall within a pressurizable working chamber (24) of the actuat... | 05/02/1995 |
| 5249935 | Piston pump A piston pump is described which adapts the output flow to the supply flow which is intended in particular for use in a hydraulic brake slip control apparatus, the pump having a pump housing (2) with working chambers (9, 10) which are connectible to suppl... | 10/05/1993 |
| 5081909 | Releasable latch mechanism for attaching an actuator to a valve An actuator comprising a housing having a chamber and a piston slidably received within the chamber. The housing is provided with an inlet port to the chamber for the introduction of an operating fluid to cause the piston to slide within the chamber. The ... | 01/21/1992 |
| 5016521 | Self-adjusting servo mechanism for actuating a friction band assembly in a planetary gear set The present invention is directed to a self-adjusting servo mechanism (10). That is, the servo pin (30) presented from the servo mechanism (10) will protract sufficiently to effect operative engagement of a friction band assembly (13) with a rotating memb... | 05/21/1991 |
| 4947732 | Electro-hydraulic servo actuator with function for adjusting rigidity An electro-hydraulic servo actuator with function for adjusting rigidity. The electro-hydraulic servo actuator comprises an electro-hydraulic transducer which transduces an electric signal into a hydraulic signal, an actuator of a cylinder type which is o... | 08/14/1990 |
| 4858439 | Device for varying a stroke A stroke variable device comprising a large diameter cylinder and a small diameter cylinder which are interconnected to each other. A large diameter piston and a small diameter piston are slidably inserted into the large diameter cylinder and the small di... | 08/22/1989 |
| 4841846 | Pneumatic actuators with liquid seals for oil and gas well swabs Apparatus and method for maintaining viscous liquid sealing substances such a grease adjacent and in contact with seals utilized in pneumatic cylinder-and-piston actuators for oil and gas well swabs, the structure including a piston member which is slidea... | 06/27/1989 |
| 4809733 | Fail-safe gate valve with separated actuators A fail-safe gate valve assembly having a power actuator and a spring actuator disposed on opposite sides of a flowline. The assembly includes a valve body, a valve chamber including a gate movable between open and closed positions for controlling fluids t... | 03/07/1989 |
| 4601233 | Hydraulic servo device with built-in accumulator A hydraulic servo device with a built-in accumulator, comprising a servo piston fit in a servo cylinder and connected via a stem to a band brake, an accumulator piston having a large diameter outer diameter portion and a small diameter outer diameter port... | 07/22/1986 |
| 4597322 | Seal assemblies A seal assembly is arranged to contain leakage of hydraulic fluid passing between a wall opening and a penetrant rod portion passing through the opening. The seal assembly includes a sliding-seal member mounted on a portion of the rod for sliding movement... | 07/01/1986 |
| 4534711 | Apparatus for producing ultrahigh pressure water jet An ultrahigh pressure water apparatus converts feed water of normal pressure into ultrahigh pressure water by means of an ultrahigh pressure pump and projects the ultrahigh pressure water through a nozzle gun in the form of jets of ultrahigh pressure wate... | 08/13/1985 |
| 4496033 | Dual piston actuator A pair of axially aligned and nested pistons are mounted in a pressure sealed arrangement within the bore of a pressure housing. A primary piston is moved in response to increasing pressure to provide an actuating output force while a secondary piston sim... | 01/29/1985 |
| 4389984 | Post-shutdown coolant-supply device The impeller bearings in a turbocharger on an internal combustion engine are supplied with a coolant, in the form of lubricating oil from the engine's crankcase, during post-shutdown coasting of the impeller. This coolant is supplied by an accumulator inc... | 06/28/1983 |
| 4359976 | Compression compensator A compression compensator for an internal combustion engine comprising a flexible disc of high heat resistant spring material is secured to the top of each of the engine pistons. In addition, a spiral spring may be placed between the disc and the piston t... | 11/23/1982 |
| 4301908 | Antivibration device for a clutch pedal An antivibration device for a clutch pedal in a clutch operating mechanism wherein upon depressing the clutch pedal a hydraulic pressure is caused in a master cylinder, which in turn actuates an operating cylinder to operate a withdrawal lever, the device... | 11/24/1981 |
| 4205638 | Fluid power supply system A double acting Diesel cycle hot gas engine comprising a plurality of engine cylinders, each having a free piston unit adapted to perform work, providing a continuous flow of compressed air to an energy consumption source and to a storage tank connected t... | 06/03/1980 |
| 4178894 | Nonpolluting liquid fuel system for engines Inside the fuel tank of a small engine liquid fuel system is a buffer chamber that has its interior communicated with the rest of the tank interior only through a small upper air vent and a restricted bottom fuel port. During fueling, fuel enters the buff... | 12/18/1979 |
| 4012173 | Variable stroke compressor A variable stroke compressor is disclosed that includes a casing with an upper and lower piston, the lower piston being connected to a piston rod and the upper piston being slidably received for reciprocal movement on the piston rod. Means are provided on... | 03/15/1977 |
| 4007667 | Hydraulic positioning and shock-absorbing apparatus Apparatus having an operating cylinder and piston rod combined with a shock-absorbing cylinder and piston. The two hydraulic devices are connected by a conduit which allows the piston rod of the operating cylinder to yield under shock loads which are abso... | 02/15/1977 |
| 3995534 | Safety arrester for arresting a hydraulically operated lifting ram of a hydraulic elevator A safety arrester for arresting a hydraulically operated lifting ram of a hydraulic elevator comprises an arrester body within which a plurality of brake shoes are located. The brake shoes are segments of a ring around a passage through the arrester body ... | 12/07/1976 |
| 3995535 | Expansible chamber device An expansible chamber device in which a cylinder of preferably rectangular configuration supports a pair of opposing flaps pivotally attached to the corners of the cylinder. The flaps sealably and slidably engage the top surface of a piston disposed withi... | 12/07/1976 |
| 3986437 | Double-acting rotary hydraulic jack A double-acting rotary hydraulic jack having two jack compartments, comprising a rotary hydraulic joint for the supply of hydraulic liquid to and the evacuation of hydraulic liquid from the compartments. The two compartments of the jack each communicate w... | 10/19/1976 |
| 3985063 | Hydraulic control system An accumulator structure for use in a hydraulic control system for controlling an hydraulic motor utilized to engage a friction device in a transmission including an accumulator piston mounted in a housing, a source of fluid pressure, a valve connected be... | 10/12/1976 |
| 3955371 | Anti-cup cutting master cylinder A master cylinder having a secondary piston for absorbing rapid initial pressure increases in proportion to the stroke of the primary piston. The master cylinder includes a housing having a first cylinder formed therein. A first piston is movable within t... | 05/11/1976 |
