Four-cycle engine lubrication structure
First Claim
1. A four-cycle engine lubrication structure for lubricating an engine and transmission with a common lubricating oil, comprising:
- an oil sump for lubricating oil provided at a lower part of a crank chamber of a four-cycle engine;
a reed valve provided at an outlet of the oil sump, said reed valve being openable when pressure in the crank chamber is high; and
an oil passage sloping upwards from the outlet of the oil sump, an outlet of the oil passage being provided above a surface level of oil accumulated within a bottom part of a transmission chamber of the transmission.
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Accused Products
Abstract
An oil sump for lubricating oil is provided at a lower part of a crank chamber of a dry sump-type four-cycle engine. A reed valve is provided at an outlet of the oil sump which opens when pressure in the crank chamber is high. Furthermore, an oil passage slopes upwards from the outlet of the oil sump, with an outlet of the oil passage being provided above an oil surface level of oil accumulated within the engine. Oil from the outlet of the oil passage is smoothly discharged from the outlet of the oil passage without being discharged into the collected oil. Furthermore, oil mixed with air within the crank chamber is not directly mixed into the collected oil and oil oxidation is therefore prevented. Since there is no direct contact with high-temperature blow-by gas, etc., oil deterioration is suppressed.
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Citations
24 Claims
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1. A four-cycle engine lubrication structure for lubricating an engine and transmission with a common lubricating oil, comprising:
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an oil sump for lubricating oil provided at a lower part of a crank chamber of a four-cycle engine;
a reed valve provided at an outlet of the oil sump, said reed valve being openable when pressure in the crank chamber is high; and
an oil passage sloping upwards from the outlet of the oil sump, an outlet of the oil passage being provided above a surface level of oil accumulated within a bottom part of a transmission chamber of the transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
a frame shaped seal member having an inverse C-shaped cross-section;
a valve base located adjacent the seal member;
a reed attached to the valve base; and
a stopper for limiting the extent to which the reed opens.
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8. The four-cycle engine lubrication structure according to claim 7, wherein the reed includes bent portions provided at corners thereof for inserting into holes formed in the valve base.
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9. A four-cycle engine having a lubricating structure for lubricating said engine and a transmission with a common lubricating oil, comprising:
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a crank chamber;
an oil sump for lubricating oil provided at a lower part of the crank chamber of the four-cycle engine;
a reed valve provided at an outlet of the oil sump, said reed valve being openable when pressure in the crank chamber is high; and
an oil passage sloping upwards from the outlet of the oil sump, an outlet of the oil passage being provided above a surface level of oil accumulated within a bottom part of a transmission chamber of the transmission. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
a frame shaped seal member having an inverse C-shaped cross-section;
a valve base located adjacent the seal member;
a reed attached to the valve base; and
a stopper for limiting the extent to which the reed opens.
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16. The four-cycle engine lubrication structure according to claim 15, wherein the reed includes bent portions provided at corners thereof for inserting into holes formed in the valve base.
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17. A four-cycle engine having a transmission which is lubricated with a common lubricating oil, comprising:
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a pair of crankcases, said pair of crankcases being partitioned into a crank chamber and a transmission chamber;
an oil sump for the common lubricating oil provided at a lower part of said crank chamber;
a reed valve provided at an outlet of the oil sump, said reed valve being openable when pressure in the crank chamber is high; and
an oil passage sloping upwards from the outlet of the oil sump, an outlet of the oil passage being provided above a surface level of oil accumulated in a bottom part of the transmission chamber. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
a frame shaped seal member having an inverse C-shaped cross-section;
a valve base located adjacent the seal member;
a reed attached to the valve base; and
a stopper for limiting the extent to which the reed opens.
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24. The four-cycle engine lubrication structure according to claim 23, wherein the reed includes bent portions provided at corners thereof for inserting into holes formed in the valve base.
Specification