Patent ID: 6039666
Filing Date: 2000-03-21
Classification: F16H

Abstract:
A hydraulic and mechanical transmission apparatus comprising:an input shaft;a first output shaft;a second output shaft;a power dividing device for dividing power inputted from a prime mover to said input shaft into a plurality of portions and transmitting the respective portions to said first and second output shafts;a hydrostatic continuously variable transmission including a hydraulic pump driven by power outputted from said first output shaft, a hydraulic motor which communicates with said hydraulic pump through a hydraulic closed circuit, and a control panel in which said hydraulic closed circuit is formed, wherein at least one of said hydraulic pump and said hydraulic motor has a variable displacement construction;a mechanical transmission device connected to said second output shaft,a power collecting shaft for collecting power respectively outputted from said mechanical transmission device and said hydraulic motor and supplying the collected power to a load; andoil supplying means for providing a supplement of oil to at least said hydraulic closed circuit,wherein said hydraulic and mechanical transmission apparatus has a characteristic which allows a rotational speed of said first output shaft and a rotational speed of said second output shaft to decrease and increase, respectively, with an increase in a rotational speed of said input shaft, andwherein said oil supplying means includes a first oil pump having a discharge flow rate that is proportional to the rotational speed of one of said input shaft and said second output shaft and a second oil pump having a discharge flow rate that is proportional to the rotational speed of said first output shaft.