Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7322271 | Rotary radial piston machine A rotary displacement machine (10) with radial pistons (19), includes a bearing (29) having a rotating thrust ring (28) and a stationary outer ring (30), with bearing rollers (31) therebetween. The thrust ring (28) in... | 01/29/2008 |
| 7225720 | Radial piston hydraulic motor and method in the control of a radial piston hydraulic motor The invention relates to a radial piston hydraulic motor (100) and to a method in the control of a radial piston hydraulic motor. The radial piston hydraulic motor (100) includes a free rotation valve (50) which is built inside it and includes a... | 06/05/2007 |
| 7014429 | High-efficiency, large angle, variable displacement hydraulic pump/motor A variable displacement hydraulic/pump motor has a yoke with a pair of shafts aligned to define a yoke pivot axis and connected to a valve plate therebetween having intake and discharge apertures. A rotatable cylinder barrel has piston cylinders open at one end to r... | 03/21/2006 |
| 6895855 | Hydraulic motors and pumps with engineered surfaces Engineered surface treatments are applied to different types of hydraulic motors and pumps to improve the life of the contacting surfaces in said motors and pumps. The engineered surface treatments are selected from texture modifications and tribiological coatings a... | 05/24/2005 |
| 6834575 | Piston assembly for a radial piston hydraulic motor The invention refers to a piston assembly for a radial piston hydraulic motor. The essence of the solution lies in that a longitudinal axis (12) of a roller (11) substantially coincides with an axis through centre of gravity of a piston body (2)... | 12/28/2004 |
| 6276261 | Piston assembly of a hydraulic radial piston-type machine A piston assembly of a hydraulic radial piston-type machine, an essential characteristic thereof being the arrangement of a roller element in a piston head. The portion of contact surface of the roller element lying close to a crown of the piston is alway... | 08/21/2001 |
| 6212994 | Positive displacement rotary machine A positive displacement rotary machine includes a piston rotor rotatable about a first axis and including a number of pistons equally spaced about the first axis and rotatably mounted about their axes on the piston rotor; a chamber rotor rotatable about a... | 04/10/2001 |
| 6205960 | Rotary and reciprocating internal combustion engine and compressor Disclosed is a self-sealing valve and cylinder configuration, an internal combustion rotary engine, or pump or compressor, with a rotating central housing which includes at least one cylinder aperture, a non-rotating timing pulley mount concentrically pos... | 03/27/2001 |
| 6003430 | Radial piston pump The eccentric end portion (5) of a pump shaft (3) is mounted in a needle roller bearing (6) which comprises a sheet metal bushing (9) and needle rollers (7) guided in a cage (8), wherein the end of the sheet metal bushing (9) remote from the pump shaft (3... | 12/21/1999 |
| 5979295 | Hydraulic motor piston The present invention relates to a piston intended for a hydraulic radial piston motor and being of the type comprising an outer cam ring having an undulated inner cam surface, an inner cylinder block which is rotatable relative to the cam ring and has ra... | 11/09/1999 |
| 5967018 | Hydraulic motor with radial propulsors retained against corresponding sliding-contact surfaces by resilient means and by mechanical-retaining means located outside said propulsors A hydraulic motor with propulsion members located between an eccentric cam associated with a shaft and a counter-element. The propulsion members consist of two elements slidable telescopically with respect to one another in the longitudinal direction and ... | 10/19/1999 |
| 5911561 | Radial pump with static eccentric and rotatable cylinders A pump for conveying a medium, especially a gas-liquid mixture, with a housing, an annular surface extending inside the housing, an eccentric arranged off center in relation to the annular surface and at least one displacer arranged between the annular su... | 06/15/1999 |
| 5878648 | Adjustable radial piston machine An adjustable radial piston machine (pump or motor) is described whose drive mechanism (10) has a comparatively compact structure and an especially good mechanical efficiency. The drive mechanism (10) has a bearing ring (19) which is arranged concentric t... | 03/09/1999 |
| 5875744 | Rotary and reciprocating internal combustion engine and compressor Disclosed is a self-sealing valve and cylinder configuration, an internal combustion rotary engine, or pump or compressor, with a rotating central housing which includes at least one cylinder aperture, a non-rotating timing pulley mount concentrically pos... | 03/02/1999 |
| 5870942 | Simplified housing structure for a hydrostatic machine A housing structure for a hydrostatic machine comprising two shells of part-cylindrical form. The shells are connectable together at their junction surfaces on a parting-plane. A drive-shaft is supported in the housing structure and its axis of rotation l... | 02/16/1999 |
| 5622052 | Double-flow hydrostatic radial piston engine with axial flow, thrust compensation, and shaft bearing A hydrostatic radial piston engine with two rotors that are supported on an axle so that they can rotate easily thereon. The rotors have a plurality of radial bores with displacement elements (pistons with slide ring) therein, sliding on the inside of a p... | 04/22/1997 |
| 5400594 | Slipper guide for a hydrostatic transmission A slipper guide for use in radial piston type hydraulic pumps and motors, especially those utilized in hydrostatic transmissions. The slipper guide provides an annular path for the slippers, guiding and maintaining the slippers engaged with the inner circ... | 03/28/1995 |
| 5391059 | Radial piston motor or pump A motor or pump assembly (1) comprises a cylinder block (4) with a plurality of radially positioned cylinders (3), a piston (2) arranged slidably reciprocable in each of the cylinders, a cam ring (7) cooperating with the pistons and being rotatably journa... | 02/21/1995 |
| 5374165 | Pump with hydrostatic piston elements and with axial thrust compensation A pump with axial thrust compensation having an external housing, a main shaft within the housing to which are axially fixed two spaced apart rotors. The main shaft supports the rotors apart at respective collars against which the rotors are clamped. Each... | 12/20/1994 |
| 5333998 | Pintle fixing construction for radial plunger pump The ease of assembly of a radial plunger pump is improved while preventing an external leakage of liquid. A pump housing 2 in the form of a cylinder having a closed bottom contains a pintle 4 therein, which is secured to the bottom of the pump housing 2 b... | 08/02/1994 |
| 5241823 | Hydraulic power system having first and second power converters A hydraulic power system having first and second hydraulic power converters in which the speed of the second power converter is proportional to the speed of the first power converter. The first hydraulic power converter includes a plurality of hydraulic p... | 09/07/1993 |
| 5239827 | Hydrostatic track ring snubber A fluid pressure independent, mechanically controlled dampener for a hydrostatic transmission pump track ring is shown. In one embodiment, two opposing wedge-shaped blocks are biased against each other by a spring-loaded bolt. A pad, axially adjacent the ... | 08/31/1993 |
| 5228290 | Hydrodynamic variator of velocity having radial pistons The improved hydrodynamic variator of velocity comprises a pump (3) having radial pistons and a hydromotor (4) also having radial pistons. At least the pump is arranged with a variable eccentricity and there is provided a central body (56) the latter havi... | 07/20/1993 |
| 5209155 | Radial piston engine In a radial piston engine having pistons bearing against the circumference of an eccentric, which pistons execute a swivelling motion upon the rotational motion of the eccentric and are in engagement with a guide body, which bears on the radially outer en... | 05/11/1993 |
| 5081906 | Mechanism, motor pump, incorporating pistons supporting, rollers for abutment of said pistons on a cam This invention relates to a hydraulic mechanism comprising a cam; a cylinder-block mounted to rotate with respect to the cam; a plurality of cylinders arranged in this cylinder-block; a plurality of pistons mounted to slide inside a cylinder; a plurality ... | 01/21/1992 |
| 4982566 | Expander band for hydrostatic transmission The present invention is an expander band for use in hydraulic pumps, motors, and hydrostatic transmissions. The band has a plurality of elongated slots located circumferentially which receive slippers attached to pistons. One reduced dimension slot fixes... | 01/08/1991 |
| 4974496 | A hydrocyclic motor A fluid motor which is useful as a pump or as an hydraulic or pneumatic engine with a high torque low speed output. The fluid motor (10) comprises at least one drive disc (24) having a generally curved outer surface (42), at least one reciprocably mounted... | 12/04/1990 |
| 4926744 | Radial piston hydraulic machine with piston having twelve circumferential fluid bearing pockets A member oscillates on a face and another member pivots on a bed of the first member. Passages are provided through the members to lead a lubrication fluid under pressure into a fluid pocket between the mentioned face and one of the members. The fluid pre... | 05/22/1990 |
| 4867042 | Casing and cover for fluid energy converter A fluid energy converter having a cover to support a cylinder barrel positioned and mounted on the casing main body. At the opening end of the casing main body, a helical taper plane at an angle not more than 45° with respect to the axial centerline of t... | 09/19/1989 |
| 4791858 | Piston machine A piston machine, particularly a radial piston machine which includes a pintle supporting a rotor which has a plurality of radially extending bores in which radial pistons are guided. These bores are in communication with control chambers formed in the pi... | 12/20/1988 |
| 4776768 | Radial plunger pump driven by a motor having seal members for protecting the motor from exposure to working fluid A radial plunger pump is provided which includes a motor housing having a motor mounted therein. A pump housing is further provided and has a pump portion defined therein. A shaft is mounted between the motor and the pump portion so that the pump portion ... | 10/11/1988 |
| 4776258 | Radial piston machine with pistons and piston shoes between faces A radial-piston machine has a rotor formed with a plurality of cylinders, wherein pistons are reciprocable. Each such piston is formed on its radially outer end with a reception seat and a pivotable portion of a respective piston shoe is engageable on the... | 10/11/1988 |
| 4747339 | Radial piston machine In a radial piston machine which includes a driven rotatable rotor with radial pistons displaceable in radial recesses of the rotor by pressure medium and carrying rollers which cooperate with a cam track of the rigid cam plate, the length of the rollers ... | 05/31/1988 |
| 4745846 | Devices which take in and expel fluid by a chamber which may border a coned ring In a fluid pump or motor improvements are provided to the piston shoes therein to permit a higher pressure in the respective device. Other improvements are done to the hydrostatic bearings in radial piston or radial chamber type fluid motors and pumps. A ... | 05/24/1988 |
| 4730546 | Rotor bush assembly in fluid machines A bush assembly is inserted into the rotor hub around a cylindrical control body which is partially extending into the bush to fill the interior of the bush. In such device, where fluid flows through the control body and the working chambers in the rotor ... | 03/15/1988 |
| 4724743 | Radial piston machine having piston shoes sealingly contained on the bed of the piston by holding pins In a radial piston pump, motor, transmission the deep diving or entering piston shoe is utilized and swingably borne in the pivot-bed of the radially reciprocating piston. Since deep diving piston shoes have large piston strokes, the shoes pivot in the pi... | 02/16/1988 |
| 4719843 | Hydraulic mechanism, engine or pump, provided with rollers mounted on the pistons and with members for holding said rollers in position This invention relates to a hydraulic mechanism having a cylinder block comprising cylinders, pistons mounted in these cylinders, and supporting rollers for abutment on a cam with respect to which the cylinder block is mounted to rotate. The mechanism for... | 01/19/1988 |
| 4704948 | Radial piston machine A radial piston machine includes a stationary cam plate and a rotational cylinder block provided with radial bores receiving a plurality of radial pistons displaceable in those bores and supported against the cam plate surrounding the cylindrical block by... | 11/10/1987 |
| 4685381 | Pivot portion of a piston shoe in fluid machines In a pivot bar portion of a piston shoe in a radial piston device wherein the pivot portion is pivotably borne in a bed in the piston which extends normal to the longitudinal axis of the piston, recesses are provided parallel to the pivot axis whereby bea... | 08/11/1987 |
| 4635534 | Pistons, piston shoes and rotors in pumps and motors In radial piston pumps and motors the dimensions of the rotor, pistons and piston shoes are optimized for best efficiency and power in a given size and weight. The efficiency and reliability of the piston shoes is improved by the provision of fluid pressu... | 01/13/1987 |
