초록 ▼

A hydrostatic transmission (HST) including a hydraulic pump is contained in a housing having upper and lower housings. An input shaft of the hydraulic pump projects outward from the upper housing. A cooling fan is provided on an upper end of the input shaft. A conduit is disposed within an area betw

A hydrostatic transmission (HST) including a hydraulic pump is contained in a housing having upper and lower housings. An input shaft of the hydraulic pump projects outward from the upper housing. A cooling fan is provided on an upper end of the input shaft. A conduit is disposed within an area between the fan and the upper housing. The conduit extends between first and second couplings and is in communication with an oil sump formed in the housing. A pumping device, which rotates with the input shaft, is disposed within the second coupling for forcedly circulating oil between the conduit and the sump. Alternatively, a reservoir is disposed on an outer wall of the housing forming a second oil sump. A level of oil in the second oil sump is lower than a level of oil in the oil sump formed in the housing. The second oil sump communicates with the atmosphere whereas the oil sump formed in the housing is separated from the atmosphere. A siphon communicates both sumps with each other. The driving apparatus may incorporate either the conduit, the reservoir, or both the conduit and the reservoir.

대표청구항 ▼

[ What is claimed is:] [1.] An axle driving apparatus comprising:a housing having an oil sump formed therein;a hydrostatic transmission (HST) contained in said housing and immersed in said oil sump;an input shaft of said HST projecting outwardly from said housing;a cooling fan provided on said input

[ What is claimed is:] [1.] An axle driving apparatus comprising:a housing having an oil sump formed therein;a hydrostatic transmission (HST) contained in said housing and immersed in said oil sump;an input shaft of said HST projecting outwardly from said housing;a cooling fan provided on said input shaft external to said housing;an oil passage, wherein each end of said passage is in fluid communication with said oil sump, said oil passage being disposed in an area of said housing which is air-cooled by said cooling fan; anda pumping means disposed between said oil passage and said oil sump, said pumping means being driven by said input shaft, wherein said pumping means circulates oil between said oil sump and said oil passage.