Lubrication apparatus for engines

Abstract

A lubrication apparatus for an engine includes a crankshaft chamber, a camshaft chamber, and an oil reservoir chamber, wherein an oil-suction piping path is provided in the oil reservoir chamber, and is communicated between the crankshaft chamber and the oil reservoir chamber. The oil-suction piping path includes, among others, a rotatable pipe including a plurality of oil-suction orifices located at wall of the rotatable pipe. No matter the engine is situated at any state of declination, at least one of the oil-suction orifices and an air-suction vent is kept under the surface of the lubricant, so that the engine can be appropriately lubricated. Further, a one-way valve is arranged between the crankshaft chamber and the oil reservoir chamber, where most of the lubricant can flow back to the oil reservoir chamber during the descending stroke of a piston, so that a lubricant supply can be reduced.

1 . A lubrication apparatus for an engine, comprising:
 a crankshaft chamber, being in communication with a space underneath a piston, and including a crankshaft chamber inlet and a crankshaft chamber outlet;   a camshaft chamber; and   an oil reservoir chamber for storing lubricants;   wherein an oil-suction piping path is provided in the oil reservoir chamber, and is communicated between the crankshaft chamber inlet and the oil reservoir chamber, and a first one-way valve is arranged between the crankshaft chamber and the oil reservoir chamber, where a valve inlet and a valve outlet are communicated, respectively, with the crankshaft chamber outlet and the oil reservoir chamber, and wherein the oil-suction piping path includes a rotatable pipe which is pivotally arranged along an axis of a cylinder block, and the rotatable pipe includes a plurality of oil-suction orifices located at wall of the rotatable pipe and an air-suction vent at an end of the rotatable pipe, and no matter the engine is situated at any state of declination, the air-suction vent is kept above a surface of the lubricant, and at least one of the oil-suction orifices is kept under the surface of the lubricant.   
   
   
       2 . The lubrication apparatus for an engine as claimed in  claim 1 , wherein the oil-suction piping path further includes, in sequence, an oil-pan built-in passage, a connecting pipe, and a lower-crankcase built-in passage, and wherein the oil-pan built-in passage is connected with the rotatable pipe, and the lower-crankcase built-in passage with the crankshaft chamber inlet. 
   
   
       3 . The lubrication apparatus for an engine as claimed in  claim 1 , further comprising a rocker arm chamber which, through a first communicating passage, is communicated with the crankshaft chamber, wherein in the first communicating passage there is provided with a second one-way valve, and a valve inlet and a valve outlet of the second one-way valve are in communication with the rocker arm chamber and the crankshaft chamber, respectively. 
   
   
       4 . The lubrication apparatus for an engine as claimed in  claim 3 , wherein the camshaft chamber is, through a second communicating passage, communicated with the oil reservoir chamber. 
   
   
       5 . The lubrication apparatus for an engine as claimed in  claim 1 , wherein the camshaft chamber is, through two communicating passages, communicated with the oil reservoir chamber and the crankshaft chamber, respectively, and in one of the two communicating passages there is arranged with a one-way relief valve for pressure release, and wherein a valve inlet and a valve outlet of the one-way relief valve are communicated with the oil reservoir chamber and the camshaft chamber, respectively. 
   
   
       6 . The lubrication apparatus for an engine as claimed in  claim 5 , wherein the two communicating passages refer to a third communicating passage and a fourth communicating passage which both are independent from each other. 
   
   
       7 . The lubrication apparatus for an engine as claimed in  claim 5 , wherein the two communicating passages refer to a fifth communicating passage and a sixth communicating passage which both have a common path section. 
   
   
       8 . The lubrication apparatus for an engine as claimed in  claim 5 , further comprising a rocker arm chamber, where a second one-way valve is arranged between the rocker arm chamber and the crankshaft chamber, such that the rocker arm chamber and the crankshaft chamber are in a one-way communication, and where a valve inlet and a valve outlet of the second one-way valve are communicated with the rocker arm chamber and the crankshaft chamber, respectively. 
   
   
       9 . The lubrication apparatus for an engine as claimed in  claim 1 , wherein the rotatable pipe includes a C-shaped tube. 
   
   
       10 . The lubrication apparatus for an engine as claimed in  claim 1 , wherein the crankshaft chamber is defined by an upper crankcase and a lower crankcase which are anchored to each other.