Abstract: Past pin joint assemblies attaching a lift arm to a construction machine have utilized grease lubricated pins. Deflection of the pins during operation caused damage to both the pin and surrounding structure. Additionally, the use of grease requires daily lubrication schedules. The present invention overcomes these and other problems by providing an oil sealed pin joint assembly which virtual eliminates daily lubrication needs. A pin is utilized with a variable profile including first and second end portions which diverge inwardly from a first predetermined diameter and terminate at a second predetermined diameter. The second diameter is in substantial axial alignment with a contact surface of a first and second collar with first and second bearing assemblies, respectively. The pin diverges outwardly from the second diameter and terminates at a third predetermined diameter. A plurality of radii blendingly interconnect the first, second and third diameters.

Abstract: A hydraulic circuit adjusts an infinitely variable drive ratio hydro-mechanical transmission in response to movements of operators speed and torque controls to enable precise selection of the wheel torque of a vehicle and selective variation of ground speed by changing drive ratio while the driving engine operates at a constant engine speed. Control fluid from a pump driven by the engine is used to generate a displacement signal for the hydrostatic section of the transmission. The displacement signal is limited to a value determined by an operators maximum speed selector while being modulated within that limit by means which compare actual output torque with a selected torque signal from the operators controls and which vary the displacement signal to conform output torque with that called for by the operator. The displacement signal is further modified when necessary by engine underspeed and overspeed sensing means responsive to variations in control fluid flow from the pump.

Abstract: A drive apparatus for a rotary output member of a vehicle or the like includes a pair of orbiting members having outwardly-projecting teeth which engage with inwardly-projecting teeth of an output member. Hydraulically-actuated piston and cylinder means provide orbiting of the orbiting members, through a rotary valving element, to in turn rotate the rotary output member.

Abstract: A hydromechanical vehicle transmission system for an engine most efficiently operated at a single speed is disclosed providing an infinitely variable reduction ratio for a given constant input speed requiring minimum operator skill in operation of the vehicle speed control and the engine torque control in both full and part load operation. The transmission consists of a multi-speed hydrostatic mechanical arrangement using a variable displacement hydrostatic pump-motor in conjunction with a fixed displacement hydrostatic pump-motor providing two power paths through the transmission, one hydrostatic and one mechanical. The preferred embodiment discloses four gear ranges although three gear ranges are sufficient to fulfill the objects of the invention.