Power unit
First Claim
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1. A power unit which comprises an engine and a transmission mechanism including a hydro static transmission which are integrally formed and in which a common oil is shared as a lubricating oil and as an operating oil,said power unit further comprising:
- an oil feed route serially connecting said engine and said hydro static transmission,oil feed means disposed in said oil feed route, andcooling means disposed in said oil feed route between said engine and said hydrostatic transmission,wherein said cooling means reduces a temperature of said common oil as said common oil flows serially from said engine to said transmission, andwherein said oil feed means provides a uni-directional circulation of said common oil from said engine to said cooling mean and then to said hydro static transmission.
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Accused Products
Abstract
In a power unit comprising an engine (13) and an HST (24) which are formed into an integral body, a lubricating oil for use in the engine and an operating oil of the HST (24) are commonized. After being cooled, the common oil is fed from the side of the engine (13) to the HST (24). Such arrangement suppresses the drop in viscosity of the common oil and prevents the drop in efficiency and the occurrence of seizing on the side of the HST (24).
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Citations
12 Claims
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1. A power unit which comprises an engine and a transmission mechanism including a hydro static transmission which are integrally formed and in which a common oil is shared as a lubricating oil and as an operating oil,
said power unit further comprising: -
an oil feed route serially connecting said engine and said hydro static transmission, oil feed means disposed in said oil feed route, and cooling means disposed in said oil feed route between said engine and said hydrostatic transmission, wherein said cooling means reduces a temperature of said common oil as said common oil flows serially from said engine to said transmission, and wherein said oil feed means provides a uni-directional circulation of said common oil from said engine to said cooling mean and then to said hydro static transmission. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power unit which comprises an engine and a transmission mechanism including a hydro static transmission which is integrally formed and in which a common oil is shared as a lubricating oil and as an operating oil,
said power unit further comprising: -
an oil feed route from said engine to said hydro static transmission, an oil reservoir connected to said oil feed route for storing said common oil, oil feed means for successively and serially circulating said common oil among said oil reservoir, said engine and said hydro static transmission, and cooling means disposed in said oil feed route between said engine and said hydro static transmission, wherein said cooling means reduces a temperature of said common oil as said common oil flows successively and serially from said engine to said cooling means and then to said hydro static transmission, and wherein said oil feed means provides a uni-directional circulation of said common oil. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification