Lear Siegler, Inc.

Hypro Corporation

Ramon Pareja

Harry J Sadler

John Leschisin

Carl R Johnson

A variable stroke positive displacement piston pump in which the effective eccentricity of the crankshaft controlling the stroke is adjustable by means of a worm/worm gear combination driving a hub to which eccentric rings are keyed.

Variable stroke positive displacement pump

A surge suppressor for dampening undesired pressure surges in a fluid handling system and using a tubular, elastomeric diaphragm disposed in a hollow chamber of a housing to separate the chamber into two isolated zones, one being exposed to the fluid exhibiting undesired pressure surges and the other being pressurized with a compressible fluid. This arrangement obviates problems caused by wrinkling or folding of the generally planar diaphragm used in prior art pulsation dampeners.

Surge suppressor

A high pressure fluid handling pump of the type having a drive shaft for connection to a drive motor where the drive shaft extends longitudinally through a pulsation dampener affixed to the pump's housing. The pulsation dampener comprises a cup-shaped housing having a pump shaft receiving bore extending through an end wall thereof and which, when secured to the motor housing, defines a hollow chamber in fluid communication with the pump's outlet. Disposed within the hollow chamber of the pulsation dampener housing and concentric with the motor's shaft is a rigid baffle member. Surrounding that is a tubular diaphragm formed from an elastomeric material of a predetermined durometer hardness, the tubular diaphragm effectively dividing the hollow chamber into two compartments isolated from one another. One compartment is exposed to the pressure surges occurring in the fluid being pumped through slits formed in the baffle member and the other compartment is pressurized by a compressible fluid to a predetermined pressure value.

Fluid pump incorporating pulsation dampener surrounding its shaft

A mechanical drive mechanism of the endless belt and pulley type having an improved belt tensioning arrangement. The shaft of the machine being driven (or that of the driving member itself) is eccentrically journaled with respect to its cylindrical bearing hub and a rigid arm having a first bore therethrough is disposed with the hub of the machine centered in that first bore. Located at the opposed end of the rigid arm is a parallel bore in which the other drive or driven shaft is journaled. Because of the eccentricity between the first shaft and its hub, as the arm is rotated about the hub as a center, the distance between the centers of the driving and driven shafts is increased or decreased, depending upon the direction of rotation of the rigid arm. As such, the tension of the endless belt coupling the drive and driven pulleys can be varied. The construction of the belt and pulley combination lends itself to being completely enclosed in a protective shroud which need not be removed to make the tensioning adjustment.

Belt tensioning apparatus for belt/pulley drive system

Improved multi-cylinder pumps wherein a plurality of co-planar positioned connecting rods are radially disposed about a crankshaft and wherein a plurality of generally cylindrical spool-like wrist pins are rotatively coupled to the connecting rods. The improvement comprises an assembly wherein the wrist pins have opposed end regions bordering a smaller diameter central region that contains one or more ring receiving grooves and which wrist pins are mountable in overlapping relation to retainer ring containing grooves formed in the connecting rods. Upon mounting retainer rings in the connecting rod grooves and inserting and rotatively locking the wrist pins in the connecting rods, the connecting rods, wrist pins and retainer rings are integrally locked together in radially extending relation.

Pump with ring retained floating wrist pins and connecting rods

Multi-cylinder in-line and radial pumps having an improved structure for coupling the piston heads to the crankshaft such that the number of parts commonly employed and the size of the resulting pump is greatly reduced when compared to prior art pumps now on the market. Both in-line piston pumps and radial diaphragm pumps are included. The connecting rods comprise plates, each having a bore through the thickness dimension thereof for receiving a cylindrical lobe formed eccentrically on the pump's crankshaft. Formed on one end of each of the connecting rods is a generally cylindrical bore, also extending through the thickness dimension of the connecting rod, the center of this bore being displaced inwardly of the end edge surface of the connecting rod by a distance which is less than the radius of the bore. A cylindrical wrist pin having a flat formed on a peripheral surface thereof is insertable into the bore or recess at the end of the connecting rod and when the pin is rotated so that its flat portion is aligned parallel to the end edge of the connecting rod, it is firmly locked in place but rotatable or floating within the recess. A bore formed perpendicular to the flat on the floating wrist pin is threaded to receive a bolt used to fasten the plunger rod to the floating wrist pin. Other features of the pumps of the present invention include a cylinder head designed to receive sleeve inserts of differing sizes whereby pistons of differing cross-sectional areas can be utilized to vary the capacity of the pump, and grooved shoulders on the connecting rods to cooperate with holding rings around the crankshaft.

Pumps with floating wrist pins

Triplex piston pump

Piston pump

An unloader valve for use in high pressure fluid handling systems which includes a valve body having an inlet port, an outlet port and a bypass port. A tubular plunger element is disposed within the housing for axial reciprocal movement, the tubular plunger having apertures formed through its side wall with the aperture communicating with the inlet port and chamber. Affixed to and coaxially aligned with an open end of the plunger is a ball check valve assembly which is disposed in the outlet chamber communicating with the outlet port. Assembled about the tubular plunger are seals and guides which isolate the outlet chamber from the bypass chamber. A poppet valve having a floating seat secured to the plunger is provided for normally isolating the inlet and bypass chambers. A spring housing is secured to the valve body and contains a compression spring which normally urges the plunger in a direction such that the poppet valve is closed. Fluid flow is then from the inlet chamber, through the tubular plunger and through the check valve to the outlet chamber and port. In the event that the fluid handling system with which the unloader valve is used causes a back pressure at the outlet port exceeding a predetermined value, the check valve closes and the plunger assembly moves in a direction against the spring force to open the poppet valve and allow fluid to flow from the inlet chamber to the bypass chamber.

High pressure unloader valve

A roller pump comprising a generally cylindrical housing and a generally cylindrical rotor disposed eccentrically within the housing, and having push rods arranged radially within the rotor for assisting in forcing radial motion of the rollers within the rotor during rotation of the rotor within the housing. A camming shaft is disposed within the housing, and arranged generally with the housing, the push rods making contact with the periphery of the camming shaft in order to provide radial motion of the push rods during rotation of the rotor. The cross-sectional dimension of the push rods is preferably equal to at least 331/3 percent of the axial length of the rollers, and secondarily preferably having a diameter generally equal to the roller diameter. The cross-sectional dimension of the push rods at the line of contact with the roller surface enables the pump to effectively handle highly viscous products.

Roller pump with radial members

An improved pressure and vacuum seal arrangement for a piston-type pump utilizing a reciprocating plunger disposed within a cylindrical sleeve. The cylindrical sleeve is provided with a pressure seal assembly adjacent the outer end thereof and a vacuum seal assembly adjacent the inner end thereof, along with an annular groove formed between the two seal assemblies to isolate the vacuum seal from the pressure seal. The annular groove, which extends around the entire inner peripheral surface of the cylindrical sleeve is in communication with the pump inlet. The pressure seal assembly comprises a generally 'U'-shaped cup held between inner and outer retaining discs, and wherein the inner retaining disc is disposed with its inner peripheral edge surface in normal running contact with the surface of the plunger and with the inner disc consisting of polytetrafluoroethylene. The vacuum seal assembly comprises a carbon guide adjacent the inner end of the cylindrical sleeve and an adjacent vacuum seal sleeve formed of polytetrafluoroethylene. The polytetrafluoroethylene sleeve is disposed outwardly of the carbon guide and resilient means are provided for biasing the inner peripheral surface of the vacuum sleeve against the outer peripheral surface of the plunger.

Dual piston pump with pressure seal lubrication feature

A multi-cylinder pump for delivering fluids under high pressure which includes a multi-lobed camshaft having bearing supported yoke elements disposed in an oil-filled crankcase for coupling the camshaft to plural piston elements such that displacement of the plural piston elements occur in a desired phase relationship and improved sealing arrangements disposed between the piston and the cylinders, between the suction inlet port and the high pressure outlet port and between the cylinders and the oil-filled crankcase to prevent cross-contamination of the oil lubricant and the fluid being pumped and to prevent any substantial leakage between the high pressure outlet port and low pressure inlet port during the suction and pressure strokes of the pistons.

High pressure multi-cylinder pump

A hydraulic motor of the Gerotor-type which is designed for rotation in both the clockwise and the counterclockwise direction and which includes a pair of relief valves arranged to protect the motor shaft seal, irrespective of the chosen direction of rotation. The Gerotor element also includes a pair of motoring grooves which cooperate with a feed channel formed in the surface of the motor end plate and with a corresponding shadow feed channel on the opposite motor front plate to equalize the forces on the rotor element of the Gerotor and thereby prevent distortion and binding of the rotor element due to thrust forces thereon. Similarly, to prevent excessive forces on the end of the motor shaft, a relief groove is provided between the normal low pressure outlet port and the bearing chamber in the end plate, such that the hydraulic force acting on the end of the shaft tending to urge it in the axial direction is no greater than the product of the cross-sectional area of the shaft and the pressure maintained at the low pressure side of the motor.

Hydraulic Gerotor motor with balancing grooves and seal pressure relief

A locking collar for releasably coupling together splined shafts and wherein the mating splined shafts include telescoping inner shaft and outer housing portions. The locking means includes a locking collar with a pair of radially spaced bores extending through the wall of the locking collar, with the bores being threaded. The housing portion of the splined shaft is provided with a threaded bore which extends in continuation with at least one of those in the locking collar. The inner diameter of the locking collar exceeds the outer diameter of the housing portion of the splined shaft by about one-and-a-half times the pitch of the threads of the bore formed in the housing portion. The arrangement is such that when a set screw is disposed within the bores having the common axis, and with the set screw making contact with the surface of the shaft portion of the splined shaft, the force of a second screw disposed in the second collar bore making contact with the outer surface of the housing sets up a resultant stress in the collar which displaces the axis of the collar bore from that of the housing bore, and further cams the first set screw tightly against the outer surface of the splined shaft.

Growing community of inventors

Edina, MN, United States of America

Ramon Pareja