Having Leakage Collecting Structure Patents (Class 60/455)
  • Patent number: 11655735
    Abstract: An onboard system and a method for draining an aeroengine. The onboard system comprises a buffer tank having an admission passage for admitting under gravity fluid coming from the aeroengine, a primary tank situated above the buffer tank and having an emptying passage for emptying the fluid coming from the aeroengine, and a lift circuit connecting the buffer tank to the primary tank in order to transfer the fluid coming from the aeroengine from the buffer tank to the primary tank.
    Type: Grant
    Filed: June 14, 2019
    Date of Patent: May 23, 2023
    Inventors: Alméric Pierre Louis Garnier, Josselin Xavier Coupard
  • Patent number: 11313100
    Abstract: Hydraulic system (120) for a vehicle comprising a vehicle hydraulic circuit (122) among others for the hydraulic supply of connecting means of an automatic coupling means, wherein the connecting means is designed to connect a coupling means (31) of the vehicle with a correspondingly designed coupling means (32) of an add-on unit and an operating hydraulic circuit (121) for supplying at least one Power-Beyond coupling, wherein the vehicle hydraulic circuit and the operating hydraulic circuit are designed independent of one another and each having a hydraulic pump.
    Type: Grant
    Filed: May 8, 2020
    Date of Patent: April 26, 2022
    Assignee: SYN TRAC GmbH
    Inventor: Stefan Putz
  • Patent number: 11255301
    Abstract: A robust apparatus to improve the efficiency and emissions of a combustion process using a plurality of cell elements disposed within a housing that is placed in the air intake to a combustion chamber. Each of the plurality of cell elements include an inner electrode and an outer electrode. The inner electrodes are electrically and physically bonded to a bonding ring. The bonding ring with the bonded inner electrodes may then be encased in a potting material to provide a robust element assembly. The opposing end of the element assembly may also be bonded together in a potting material. The robust element assembly as described herein is better suited to survive the harsh environment of the ozone cell place in or near a combustion engine or process.
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: February 22, 2022
    Assignee: Clack Technologies, LLC
    Inventors: Marc Allen Bossert, Rance Edd McKenzie
  • Patent number: 10780853
    Abstract: The present disclosure is related to a transmission for a powered vehicle. The transmission includes a housing defining an interior of the transmission and a fluid supply portion disposed in the housing. The fluid supply portion is configured to supply fluid throughout the transmission. The transmission also includes a first fluid circuit disposed within the housing and defining a first fluid path in fluid communication with the fluid supply portion. A second fluid circuit fluidly defines a second fluid path in fluid communication with the fluid supply portion. The transmission further includes a coupling mechanism for fluidly coupling the first fluid circuit and second fluid circuit, wherein the second fluid circuit is disposed outside the housing of the transmission.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: September 22, 2020
    Inventors: Charles F. Long, Richard H. Price
  • Patent number: 10669128
    Abstract: A system controls leakage in a pit which contains equipment which uses pressurized hydraulic fluid. A tap communicates with a space holding leaked fluid, and directs leaked fluid to a fluid sump. A pump moves fluid from the fluid sump to a hydraulic fluid recapturing holding tank located outside the pit above a fluid reservoir. Fluid from the fluid reservoir is selectively relocated into the fluid reservoir, which re-supplies the equipment. An electronic control panel located outside the pit interacts with a remote computer to provide a remote user with information concerning operation of the system and to allow the remote user to monitor and control at least certain operations of the system, and which processor also controls operation of the pump and actuating valve. All of the mechanical and electrical equipment of the system is located outside of the pit.
    Type: Grant
    Filed: April 4, 2016
    Date of Patent: June 2, 2020
    Assignee: W2W 777 Operations, LLC
    Inventors: Barry Robbins-Capuano, Jerome Fokas
  • Patent number: 9879532
    Abstract: The invention relates to a hydraulic axial piston machine (1) of dry case type of construction, whose case (2) is provided for connection to a gearing case (21) so as to form a fluid-tight overall case. The case (2) has openings (10) which permit the passage of leakage hydraulic fluid or of lubricant into the gearing case (21). By means of this design, splashing losses of the axial piston machine (1) are eliminated, and the leakage hydraulic fluid or the lubricant serve for the lubrication both of the axial piston machine (1) and of the gearing (20).
    Type: Grant
    Filed: May 27, 2015
    Date of Patent: January 30, 2018
    Inventor: Wilhelm Goellner
  • Patent number: 9115830
    Abstract: A conduit assembly has a slip coupling arrangement which allows two separate process or product flow streams with differential temperatures to flow side by side while subject to repeated cycles of thermal expansion and contraction. An inner pipe extends through an outer pipe with an annular plate welded therebetween as a liquid-tight seal at an assembly first end. A slip coupling outer element is fixed to the outer pipe at a second end and has two O-rings engaged within grooves. A slip coupling inner element is fixed to the inner pipe and extends within the outer element with a land which engages the O-rings, allowing thermal expansion and contraction of the conduit assembly with the inner element moving axially with respect to the outer element while retaining a liquid tight seal therebetween. For large temperature variations or long conduit runs, the slip coupling may be longer with polymer slider rings.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: August 25, 2015
    Assignee: Badger Ridge Industries, LLC
    Inventors: Edward P. Brogan, Corey M. Hoel
  • Patent number: 8876495
    Abstract: Example fluid circuits (e.g., within aircrafts) include first and second pump assemblies. The first pump assembly has an electric motor and a first fluid pump. The first fluid pump is coupled to the electric motor and has a case drain port that is in fluid communication with a case drain region of the first fluid pump. The second pump assembly is powered by hydraulic pressure from the first fluid outlet of the first fluid pump and functions to augment flow through the case drain region of the first fluid pump.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: November 4, 2014
    Assignee: Eaton Corporation
    Inventors: Phillip Wayne Galloway, Jeffrey David Skinner, Kelly Dale Valtr
  • Patent number: 8528594
    Abstract: Hydraulic system with a hydraulic machine, in particular an axial piston or radial piston unit, with rotating and moving machine components which are arranged in a housing. The housing is connected to a high-pressure and a low-pressure line of a working circuit, which is supplied with pressure fluid by means of a charge pump. The leakage fluid which occurs in the housing collects in a leakage fluid reservoir which is arranged below the rotating and moving hydraulic machine components in the working position of the hydraulic machine and is connected fluidically to the housing. The leakage fluid is pumped out of the leakage fluid reservoir into the low-pressure line of the working circuit by the charge pump.
    Type: Grant
    Filed: September 28, 2010
    Date of Patent: September 10, 2013
    Assignee: Sauer-Danfoss Inc.
    Inventor: Wilhelm Gollner
  • Publication number: 20130152564
    Abstract: A hill hold control system and method for a closed loop transmission of a machine is disclosed that includes performing the following steps while the transmission is in neutral: sensing motor shaft movement; and generating fluid flow to offset motor shaft movement and cause substantially zero shaft movement. The method can include comparing a brake timer to a delay value, and activating a brake when the timer exceeds the delay value. The method can include sensing when a brake is applied, and discontinuing the step of generating fluid flow to offset motor shaft movement when a brake is applied. Motor shaft movement can be sensed by sensing rotational speed. Generating fluid flow to offset motor shaft movement can include determining direction and magnitude of fluid flow as a function of the sensed movement; and adjusting the direction and magnitude of fluid flow based on recurring readings of the sensed movement.
    Type: Application
    Filed: December 16, 2011
    Publication date: June 20, 2013
    Inventors: Bryon P. Neumann, Chris J. McDonald, Mark E. Breutzman
  • Publication number: 20130074487
    Abstract: The invention relates to a drive system having at least one hydraulic actuator (2), which is supplied with pressure medium (4) by means of at least one pressure-medium pump (3) in a main circuit, the pressure-medium pump (3) being a rotational-speed-controlled pressure-medium pump that is driven by a motor (5) at a variable rotational speed and a controlled torque, said drive system being characterized in that leakage fluid (7) that escapes from a displacement chamber (6) of the pressure-medium pump (3) is discharged through a fluid-conducting connection (8) having at least one check valve (9, 16), and the at least one check valve (9, 16) is installed in the fluid-conducting connection (8) in such a way that the check valve prevents pressure medium from flowing back out of the main circuit into the displacement chamber (6) or another interior chamber of the pressure-medium pump (3) and feeds leakage fluid (7) into the main circuit of the drive system (1) when there is a slight excess pressure.
    Type: Application
    Filed: March 15, 2011
    Publication date: March 28, 2013
    Applicant: Hydac Electronic GMBH
    Inventors: Frank Herold, Kai Remus, Frank Kattler
  • Patent number: 8403644
    Abstract: A power generating apparatus of renewable energy type in which a hydraulic pipe between a hydraulic pump installed inside a nacelle and a hydraulic motor installed near a bottom part of a tower can handle the turning motion of the nacelle. In the power generating apparatus of renewable energy type, a hydraulic pump inside the nacelle and a hydraulic motor near a base end part of a tower are connected by a first double pipe and a second double pipe. The first double pipe is rotatably connected to the second double pipe. The first double pipe includes a first inner pipe and a first outer pipe. The second double pipe includes a second inner pipe and a second outer pipe. The first and second inner pipes communicate with each other to form an inner passage. The first and second outer pipes communicate with each other to form an outer passage.
    Type: Grant
    Filed: June 16, 2011
    Date of Patent: March 26, 2013
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Kazuhisa Tsutsumi, Takuro Kameda, Taku Ichiryuu
  • Publication number: 20100205953
    Abstract: A case drain circuit particularly well suited for use with a bulk fill subassembly or a vacuum fan assembly of an agricultural implement towed by a tractor or similar vehicle includes a pressure switch that may cause illumination of an in-cab warning light and/or sounding of an in-cab alarm when pressure in the case drain circuit exceeds a predetermined threshold. A fan is driven by a solenoid controlled hydraulic motor which is supplied hydraulic fluid under pressure from a flow control valve to the motor in accordance with electrical signals that are supplied to the solenoid by a controller. The case drain circuit provides a pathway along which leakage fluid from the motor may be delivered to a fluid reservoir, preferably carried by the towing vehicle. During undesirable high pressure conditions in the case drain circuit, the pressure switch provides a corresponding high pressure signal to the controller that in turn cuts electrical current to the solenoid to cut the flow of hydraulic fluid to the motor.
    Type: Application
    Filed: February 13, 2009
    Publication date: August 19, 2010
    Inventors: Leonard A. Bettin, Darwin Steffensen
  • Publication number: 20090133574
    Abstract: A hydraulic actuator has an armored section having concentric cylinders and an unarmored section having a cylinder with a frangible piston and a frangible upper gland nut. The hydraulic actuator may have leakage vents adapted to prevent leakage between hydraulic systems used to power the cylinders. The hydraulic actuator also may have a gland seal for sealing an end of the cylinder of the unarmored section and a sensing port adapted for allowing detection of fluid leaking due to damage of the gland seal.
    Type: Application
    Filed: May 8, 2007
    Publication date: May 28, 2009
    Inventors: Carlos A. Fenny, Brent C. Ross, John R. Barber, Jr
  • Publication number: 20090107134
    Abstract: The invention improves a pump provided with an eccentric cam bearing, a drive bearing, a drive shaft, an electric drive motor, and a pump housing.
    Type: Application
    Filed: February 12, 2007
    Publication date: April 30, 2009
    Inventors: Rolf Stotz, Martin Karl
  • Patent number: 7082756
    Abstract: A failure detection device for a hydraulic motor of the present invention comprises a hydraulic pump 3 that is driven by a prime mover 2; a hydraulic motor 1 that is driven by hydraulic oil discharged from the hydraulic pump 3; an abnormality detection device 35 that detects an abnormal operation of the hydraulic motor 1; and a warning device 30, 39, 40 that issues a warning when the abnormal operation of the hydraulic motor 1 is detected by the abnormality detection device 35.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: August 1, 2006
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kazuhiro Ichimura, Katsuaki Kodaka, Akiko Yoshio, legal representative, Saburou Yoshio, deceased
  • Patent number: 7004062
    Abstract: An elevator pit receptacle and float valve assembly provide for the safe displacement and collection of seeped hydraulic fluid from an elevator cylinder/piston assembly. The receptacle is elevated above the ground yet is below the cylinder seepage ring. A float valve is connected to the ring's drainage hole at one end, and a tube is connected therefrom to the receptacle. Should hydraulic fluid leak into the seepage ring, and the level of such fluid rises above the drainage hole, the fluid drains, by gravity, into the pit receptacle. In the event water intrudes into the elevator pit to a level that reaches the float, as the float rises, the valve shuts closed which prevents an unwanted commingling of water and drained fluid.
    Type: Grant
    Filed: April 23, 2004
    Date of Patent: February 28, 2006
    Inventor: Charles Paduano
  • Patent number: 6393839
    Abstract: Pressurized medium delivery device with a pump, a suction pipe, at least one pressure pipe and a pressurized medium supply volume in a pressurized medium supply container.
    Type: Grant
    Filed: November 10, 1999
    Date of Patent: May 28, 2002
    Assignee: LuK Fahrzeug-Hydraulik GmbH & Co. KG
    Inventor: Ivo Agner
  • Patent number: 5623870
    Abstract: An oil mist eliminator filter used with a dynamic oil control mechanism consisting of a vacuum-inducing jet-pump to vacuum oil leaking from about an oil seal, an oil seal located around the drive piston on the press slide, a drain port located about the housing in which the drive piston reciprocates. The oil mist eliminator filter, downstream of the jet pump, separates the oil from the air with 99.97% efficiency allowing the cleaned air to escape freely to atmosphere without causing pressurization of the press reservoir and leaks at the press reservoir, and allowing the oil to constantly recirculate back to the press reservoir thus permitting use of the oil control system without the need to shut the oil control system off to drain accumulated leakage oil.
    Type: Grant
    Filed: September 20, 1995
    Date of Patent: April 29, 1997
    Assignee: The Minster Machine Company
    Inventor: Edward A. Daniel
  • Patent number: 5557931
    Abstract: Means for connecting auxiliary pumps and charge pumps to an axle driving apparatus to transfer power from a light duty vehicle engine to an output axle, wherein the charge and/or auxiliary pumps are mounted to the external housing for an integrated hydrostatic transmission or to the external housing for a hydrostatic transmission which is connected to separate axle mechanisms.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: September 24, 1996
    Assignee: Hydro-Gear Limited, Limited Partnership
    Inventors: Ray Hauser, Daryl Smothers, John Schreier
  • Patent number: 5555727
    Abstract: Means for connecting auxiliary pumps and charge pumps to an axle driving apparatus to transfer power from a light duty vehicle engine to an output axle, wherein the charge and/or auxiliary pumps are mounted to the external housing for an integrated hydrostatic transmission or to the external housing for a hydrostatic transmission which is connected to separate axle mechanisms.
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: September 17, 1996
    Assignee: Hydro-Gear
    Inventors: Ray Hauser, Daryl Smothers, John Schreier
  • Patent number: 5469704
    Abstract: The invention relates to a hydraulic drive apparatus having a cylinder. Said cylinder comprises a piston movably mounted in a working chamber, a piston rod which is guided towards the outside through a cylinder head and a wear resistant primary seal and a leakage free secondary seal. Both said seals act between the cylinder head and the piston rod, with the primary seal being closer to the working chamber than the secondary seal. Further, a leakage oil conduit is provided between the primary seal and the secondary seal. Such a hydraulic drive apparatus is to be improved such that the cylinder will hold or maintain a load in a certain position even if the pump is switched off for a long period of time. This is achieved by providing that the leakage oil conduit can be subjected to the load holding pressure by switching a valve.
    Type: Grant
    Filed: November 18, 1993
    Date of Patent: November 28, 1995
    Assignee: Mannesmann Rexroth GmbH
    Inventor: Otmar Kramer
  • Patent number: 5467705
    Abstract: A dynamic oil control mechanism for a press including a vacuum inducing ejector or jet-pump to vacuum oil leaking from about an oil seal. The oil seal is located around the drive piston on the press slide to prevent oil migration from the press crown to the die area or slide of the press. A drain port is located about the housing in which the drive piston reciprocates. The ejector maintains a low pressure area within the drain port to pull oil leaking from the seal into the drain port and away from the drive piston. The vacuumed oil is then transferred to an oil reservoir.
    Type: Grant
    Filed: March 23, 1995
    Date of Patent: November 21, 1995
    Assignee: The Minster Machine Company
    Inventors: Edward A. Daniel, Norman J. Couchot, Daniel L. Keller, William C. Brewer
  • Patent number: 5173019
    Abstract: A pump assembly including an impeller mounted on a shaft for rotation in an impeller casing to move liquid through the casing, the shaft being supported by bearings located in a bearing housing which contains bearing lubricating fluid, a primary seal providing a seal between the shaft and the impeller casing to prevent leakage of liquid from the casing, a secondary seal providing a seal between the shaft and the bearing housing to prevent leakage of lubricating fluid from the bearing housing and a containment vessel interposed between the impeller casing and the bearing housing connecting the impeller casing to the bearing housing and enclosing the primary seal and the secondary seal, the containment vessel having an orifice through a wall thereof for communicating the interior of the containment vessel with a storage container, the orifice being sized to pass liquid emissions from the primary seal during normal pumping operations to the storage container, but to restrict the amount of pumped liquid that is p
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: December 22, 1992
    Assignee: American Gage and Machine Company
    Inventor: Arnold R. Sdano
  • Patent number: 5146748
    Abstract: An axle driving apparatus which houses in a transmission casing thereof a hydraulic motor and a hydraulic pump of a hydro-static-transmission and disposes in the transmission casing a center section for connecting the hydraulic motor and hydraulic pump, thereby fixing the center section at the butt joint of the casing and which disposes an oil filter and check valves or the like in the center section so that lubricating oil in the transmission casing is made absorbable as operating oil for the hydro-static-transmission.
    Type: Grant
    Filed: August 16, 1990
    Date of Patent: September 15, 1992
    Assignee: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventor: Hideaki Okada
  • Patent number: 5050380
    Abstract: A means for receiving and subsequently emptying hydraulic fluid from a hydraulic system is described. It comprises a working cylinder (1) and a supply conduit (8) disposed between a pump and the working cylinder for supplying hydraulic fluid at high pressure within a predetermined interval. According to the invention the means also comprises a receiving cylinder (12) with a piston (19), which on one side defines a liquid space (22) for the receipt of hydraulic fluid from the working cylinder with an emptying pressure essentially lower than said high pressure, the piston (19) on the other side defines a chamber (21) containing gas at low pressure, and a high-pressure cylinder (13), which has a liquid space (28) and a plunger (30) movable therein, said liquid space (28) being connected to said supply conduit (8) to receive and return hydraulic fluid at high pressure therefrom and thereto, respectively.
    Type: Grant
    Filed: August 20, 1990
    Date of Patent: September 24, 1991
    Assignee: Kamyr Aktiebolag
    Inventor: Allan Jonsson
  • Patent number: 5042250
    Abstract: A hydrostatic power steering device is disclosed, which may be either a fluid controller (15) or a torque generator 111. The device is of the type including a housing (19;135) defining a fluid inlet port (29;113) and a return port (31;115). The device includes valve means (36;171) defining a neutral position and a first operating position. The device includes a gerotor mechanism (23;143) for imparting follow-up movement to the valve means in response to fluid flow through the gerotor, and a follow-up mechanism (49,51;183,185) transmits the follow-up movement to the valve means. The valve means defines a return fluid region (87,89,31g;205,197,157) which comprises part of the main fluid path. The return fluid region is isolated from the follow-up means and from the interior of the valving.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: August 27, 1991
    Assignee: Eaton Corporation
    Inventors: Keith R. Carlson, Dwight B. Stephenson, Timothy A. Hjelsand
  • Patent number: 4945724
    Abstract: Hydraulic fluid leakage collection apparatus that includes an annular collection chamber that is carried in a cylindrical member within which a piston member is movable. A seal and wiper are carried by the clamp cylinder of an injection molding machine to seal the space between the clamp piston and the clamp cylinder and also to wipe from the surface of the clamp piston accumulated hydraulic fluid. Positioned adjacent the wiper ring is a drain passageway that is adapted to receive the hydraulic leakage fluid that is wiped by the wiper ring from the piston. A conduit extends from the drain passageway to an air operated vacuum pump to draw the leakage hydraulic fluid from the drain passageway. A container is positioned in the conduit between the drain passageway and the vacuum pump to collect the hydraulic leakage fluid that is collected.
    Type: Grant
    Filed: January 26, 1989
    Date of Patent: August 7, 1990
    Assignee: Cincinnati Milacron Inc.
    Inventor: James I. O'Neal
  • Patent number: 4715180
    Abstract: The invention contemplates hydraulic-lift mechanism which employs a power integrator in the connection between a charged hydraulic accumulator and the actuator for a vertically positionable load; the power integrator, additionally, has a prime-mover connection, and the pressurized charge of the accumulator is advisedly set to fully accommodate a preselected level of average load upon the actuator. The hydraulic circuit importantly includes check valves, with a pilot-operated check valve interposed between the power integrator and the accumulator and another pilot-operated check valve interposed between the power integrator and the load actuator. The pilot-operated check valves cooperate with other check valves to assure automatic transfer of hydraulic fluid under pressure from the accumulator to the load actuator, and vice versa, as may be determined by selected control of or via the power integrator.
    Type: Grant
    Filed: April 18, 1984
    Date of Patent: December 29, 1987
    Assignee: Dynamic Hydraulic Systems, Inc.
    Inventor: Alan H. Rosman
  • Patent number: 4445332
    Abstract: High-pressure hydraulic hoses are employed in hydrostatic drive systems to interconnect the transmission and motors thereof. It is imperative that fluid leakage be held to a minimum, or preferably eliminated, particularly where a vehicle employing the drive system is operated in a high-temperature environment, such as a foundry. The hose assembly (13) of this invention provides a high degree of system reliability, relative to hydraulic leaks, and shields a high-pressure hose thereof (14) against damage and heat conduction to hydraulic fluid therein. The hose assembly (13) comprises a flexible high-pressure hose (14), an impervious flexible jacket (17) surrounding the hose in out-of-contact relationship therewith to define a fluid chamber (18) therebetween, and a mounting assembly (22) for mounting the hose (14) and the jacket (17) on a support member (23) to maintain them in out-of-contact relationship relative to each other.
    Type: Grant
    Filed: March 24, 1982
    Date of Patent: May 1, 1984
    Assignee: Caterpillar Tractor Co.
    Inventors: Jerome A. Thies, Mark E. Tietje
  • Patent number: 4432442
    Abstract: The disclosure concerns a hydrodynamic torque transfer unit, especially in the form of a hydrodynamic brake. The unit includes a working chamber with a stator and a rotor therein. The rotor is supported on a rotating shaft which has seals thereon outside the working chamber. Working fluid that leaks past the rotor shaft seals is collected in a leaked fluid reservoir. Both the fluid outlet from the leaked fluid reservoir and from the outlet line connected with the working chamber are delivered to a working fluid cooling reservoir. The working chamber is fed with working fluid from a separate feed reservoir. The cooling reservoir delivers recirculated working fluid to the feed reservoir. The feed reservoir is selectively pressurizable to force working fluid into the working chamber.
    Type: Grant
    Filed: July 27, 1981
    Date of Patent: February 21, 1984
    Assignee: Voith Turbo GmbH & Co. KG
    Inventor: Klaus Vogelsang
  • Patent number: 4425758
    Abstract: A hydrostatic transmission (10) includes a variable displacement pump (12) for driving a fluid motor (14) in first and second directions. First and second high pressure conduits (20,22) connects the pump (12) and motor (14) in a continuous fluid circuit. A control pump (40) supplies make-up fluid to the first and second high pressure conduits (20,22) and simultaneously provides pressurized control fluid to a system control (50) for controlling the operation of the hydrostatic transmission (10). First and second low pressure conduits (24,26) are respectively disposed about the first and second high pressure conduits (20,22) and defines first and second spaces (28,30) therebetween. A pressure control arrangement (32) is connected to the first and second spaces (28,30) to control the maximum pressure level in the spaces (28,30) upon the failure of one of the high pressure conduits (20,22).
    Type: Grant
    Filed: March 24, 1982
    Date of Patent: January 17, 1984
    Assignee: Caterpillar Tractor Co.
    Inventors: Lawrence F. Schexnayder, Jerome A. Thies
  • Patent number: 4329064
    Abstract: In a cement-mixer truck having a mixing drum rotated via a step-up transmission by a hydrostatic motor in turn energized by a power pump driven by the vehicle engine, the motor is disposed in a chamber at least partially filled with coolant replenished by leakage from the power pump and the motor and by oil from a valve housing supplied via a pressure-regulating and a bleeding valve respectively tapping high-pressure and low-pressure pumping conduits of a hydraulic circuit. The motor coolant chamber is surrounded by an oil reservoir connected at an output via an internal filter and a second engine-driven pump to the hydraulic circuit for feeding oil thereto and at an input via a heat exchanger to the motor chamber for drawing hot fluid from the motor bath, the reservoir serving in part to reduce noise from the hydraulic motor. A ventilating fan at the heat exchanger and a water pump are driven directly by the same shaft that is connected to the step-up transmission.
    Type: Grant
    Filed: January 30, 1980
    Date of Patent: May 11, 1982
    Assignee: Zahnradfabrik Friedrichshafen AG
    Inventors: Egon Mann, Helmut Eymuller
  • Patent number: 4241578
    Abstract: A hydraulic fluid storage tank for an industrial vehicle. A small surge tank (44) is mounted on top of a main tank (10) and communicates with the main tank via a drain back hole (49) formed in the top of the main tank. A first breather tube (46), having one end opening within the surge tank, extends directly into the main tank. A second breather tube (48), having one end opening within the surge tank, enters the main tank through the drain back hole, extends along the top of the tank, and opens into the tank at a point substantially rearward of the first vent tube. If, due to movement of the vehicle, one of the breather tubes becomes filled with oil, the other will still function. Oil which momentarily floods one of the breather tubes enters the surge tank and drains back to the main tank via the drain back hole.
    Type: Grant
    Filed: June 18, 1979
    Date of Patent: December 30, 1980
    Assignee: Eaton Corporation
    Inventor: Derek K. Keene, deceased
  • Patent number: 4168652
    Abstract: A power transfer unit for transferring power between two separate hydraulic circuits comprising a casing, a pair of cylinder blocks in the casing, cylinders within each cylinder block, a piston in each cylinder, a leakage chamber within the casing, cam means located in said chamber for causing joint reciprocation of the pistons, pistons or extensions thereof extending from the cylinders to the cam means in the chamber, first valve means co-operating with the cylinders of the first block, second valve means co-operating with the cylinders of the second block, first leakage collecting means for the first valve means separate from said chamber, second leakage collecting means for the second valve means separate from said chamber, and a vent for said chamber separate from said leakage collecting means.By this arrangement any leakage to the chamber may be from either or both circuits and by virtue of the vent may be disposed of rather than fed back to either circuit.
    Type: Grant
    Filed: March 6, 1978
    Date of Patent: September 25, 1979
    Assignee: Dowty Rotol Limited
    Inventor: David E. Bick
  • Patent number: 4074782
    Abstract: A skid steer loader comprising an improved loader main frame and including an operator's compartment designed to present a low profile vehicle particularly suitable for low clearance applications. A improved hydraulic system for the vehicle includes a new arrangement of an implement pump interconnected with the hydraulic drive pumps of the steering system of the vehicle. An internal connection between the drive pumps and the implement pump substantially improves the flow of hydraulic fluid through the system by providing an internal passage for flow of excess hydraulic fluid from a drive pump to the implement pump to supply the implement pump with inlet fluid.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: February 21, 1978
    Assignee: Clark Equipment Company
    Inventor: James J. Bauer
  • Patent number: 4033127
    Abstract: A hydraulic system for mobile industrial equipment wherein the wheels or tracks of the mobile equipment are driven by a hydraulic transmission system having an engine-driven pump assembly, and wherein the hydraulic accessories mounted on the equipment are powered by a separate engine-driven hydraulic pump which draws its fluid from the hydraulic transmission pump assembly, and particularly the charge pump component thereof.
    Type: Grant
    Filed: June 4, 1976
    Date of Patent: July 5, 1977
    Assignee: Jacob Amstutz
    Inventors: Jacob Amstutz, Paul G. Amstutz
  • Patent number: 3943717
    Abstract: A hydraulic cylinder comprises a piston reciprocally mounted in a housing thereof. A pair of annular sealing means, slidably receiving a rod of the piston, are disposed on either side of an annular chamber which has pressurized fluid pumped therethrough for flushing purposes.
    Type: Grant
    Filed: February 13, 1975
    Date of Patent: March 16, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Lawrence F. Schexnayder