Deere + Company

Roger J Nelson

Donald J Macdonald

William L Snyder

Arlen W Koelling

James A Miller

Bennie Joe Vaughn

A radial piston pump is provided with a plurality of valve/piston cartridges. Each cartridge includes the piston and at least one of the valves connecting the piston to the inlet and outlet passages of the pump. The bearings for the main rotor are pre-loaded using a threadedly adjustable end guill. Once adjusted, the end quill is held in location by a pin or the like. The rotor itself is provided with counterweights to balance the eccentric cam surface. These features allow construction of a pump housing which is substantially a single unit, rather than two pump halves. A significant reduction in the number of machined bores also is obtained.

Rotor bearing pre-load for a radial piston pump

A radial piston pump is provided with a plurality of valve/piston cartridges. Each cartridge includes the piston and at least one of the valves connecting the piston to the inlet and outlet passages of the pump. The bearings for the main rotor are pre-loaded using a threadedly adjustable end quill. Once adjusted, the end guill is held in location by a pin or the like. The rotor itself is provided with counterweights to balance the eccentric cam surface. These features allow construction of a pump housing which is substantially a single unit, rather than two pump halves. A significant reduction in the number of machined bores also is obtained.

Valve/piston cartridge and rotor bearing pre-load for a radial piston

A two stage brake valve for communicating fluid pressure to a brake assembly. The valve has a stepped cylinder formed therein in which a high volume piston and high pressure valve are slidably located. The piston and valve define high volume and high pressure chambers respectively. A set of passageways through the piston and valve communicate fluid pressure from the high volume chamber to the high pressure chamber and from the high volume chamber to a reservoir. Relief valve elements located in the passageways regulate fluid communication between the chambers and reservoir. A motion responsive relief valve comprising a ring and groove is also disclosed which provides an orifice function and facilitates refilling of the first chamber. One embodiment includes a highly compact relief assembly valve assembly having dual poppets which act to communicate fluid pressure from the first chamber to either the second chamber or the reservoir. The compact nature of the brake valve assembly will also permit incorporation of a differential lock valve assembly in the same valve body.

Two stage brake control valve

An engine driven agricultural tractor has a hitch control system with an actuator which is responsive to a differential coolant pressure across the engine driven coolant pump.

Vehicle with coolant pressure responsive hitch control

A cylinder stop or collar includes a pair of identical mating cam members. Each cam member has a body and a pair of ramps which define cam surfaces. The ramps have slots for receiving attaching means such as bolts. Each cam member also has a slot so that it may be slid on and off the rod of a cylinder without disconnecting the cylinder.

Cylinder spacer

A hydraulic cylinder stroke limiter has a valve for controlling fluid flow from a port of the cylinder. A flexible hose has one end fixed to the valve housing and the other end movably supported at the rod end of the cylinder by a pivotal bracket. A cable extends through the hose and is anchored at one end with respect to the bracket and at the other end to a poppet movable to open to close the valve. A stop is mountable on the piston rod to engage the bracket, its movement being communicated by the cable to the poppet to close the valve and prevent further rod retraction.

Cylinder stroke limiter

A bi-directional fluid flow transducer includes a hollow cylindrical housing which slidably receives a movable hollow cylindrical core which coaxially receives a fixed rod or valve member. A pair of springs are biased to urge the core to a neutral position. The core is displaced from its neutral position in the direction of fluid flow by an amount linearly proportional to the rate of fluid flow. An LVDT coil and circuit generate an output signal which represents the amount and direction of core displacement.

Bi-directional flow transducer

A fluid flow sensor includes a housing defining a flow path for fluid flow therethrough. A valve member slidably engages the housing and moves with respect to a fixed cylindrical metering member in response to fluid flow through the flow path. A spring biases the valve member to a no-flow position. A portion of the valve member engages a seat to prevent reverse fluid flow. The metering member receives one end of the valve member while a reluctive displacement transducer is received by a bore extending into the valve member from the other end.

Flow transducer

The lower draft link of a tractor three-point hitch includes a sensor to sense draft loads imposed on the draft link by an earth-working implement. Variations in the draft load cause variations in the pressure of the fluid in the sensor from a preselected pressure. A pilot-operated, load control valve is connected to the sensor and is shiftable in response to pressure above and below the preselected pressure to actuate a control mechanism. The control mechanism actuates a direction control valve for directing fluid to and from a hydraulic lift cylinder for respectively raising and lowering the draft link to adjust the implement so as to maintain the preselected pressure and thus maintain the desired draft load.

Growing community of inventors

Cedar Falls, IA, United States of America

Roger J Nelson