Pressure oil leakage relief structure of oil pump for differential device

Abstract

Abstract PURPOSE:To improve the durability of an oil seal by forming a radial relief oil passage guiding the leaked pressure oil from an oil pump on a rotary input shaft, forming an axial relief oil passage communicated to it, and opening it at a rotary input shaft end face section on the differential mechanism side in a housing. CONSTITUTION:The pressure oil leakage occurs from a discharge port 109 to an oil seal 117 side via a gap between an inner rotor 103, an inner hub 105 and a pump housing 102 in an oil pump 100 arranged on an input shaft 13. This leaked pressure oil passes the radial relief oil passage 123 and axial relief oil passage 124 of the input shaft 13 from the radial relief oil passage 121 on the rear end face of a companion flange 115 and is returned to a differential case 15 side through a rear opening 125 as shown by arrows. Lubricating oil is used with no waste, no pump leakage pressure is applied to the oil seal 117 in front of the oil pump 100, and the durability of the oil seal 117 is improved.

Inventors

• 👤 Yoshinobu Ezure
• 👤 江連　宜伸
• 👤 Shoji Tokushima
• 👤 昭治 徳島

Bibliographic Details