Lubricating oil discharge and filling structure

Abstract

A lubricating oil discharge and filling structure of an oil pan including a cylindrical lubricating oil amount adjustment wall vertically provided from a bottom surface of the oil pan, and having a lubricating oil amount adjustment passage communicating with an outside of the oil pan, formed on an inner periphery. The lubricating oil amount adjustment wall has a lubricating oil discharge hole formed in a lower part, to the lubricating oil amount adjustment passage, a cylindrical lubricating oil amount adjustment plug in which a communication hole that communicates with the lubricating oil amount adjustment passage is formed is assembled movably along the lubricating oil amount adjustment passage. The lubricating oil amount adjustment plug includes a screw portion that screws into a screw groove formed in the lubricating oil amount adjustment passage, and a sealing wall that seals discharge of the lubricating oil from the lubricating oil discharge hole.

1 . A lubricating oil discharge and filling structure capable of discharging lubricating oil that is enclosed into an oil pan, and adjusting an enclosing amount, comprising:
 a cylindrical lubricating oil amount adjustment wall that is vertically provided from a bottom surface of the oil pan, and has a lubricating oil amount adjustment passage that communicates with an outside of the oil pan, formed on an inner periphery,   wherein the lubricating oil amount adjustment wall has a lubricating oil discharge hole formed in a lower part,   to the lubricating oil amount adjustment passage, a cylindrical lubricating oil amount adjustment plug in which a communication hole that communicates with the lubricating oil amount adjustment passage is formed is assembled movably along the lubricating oil amount adjustment passage,   the lubricating oil amount adjustment plug includes a screw portion that screws into a screw groove formed in the lubricating oil amount adjustment passage, and a sealing wall that seals discharge of the lubricating oil from the lubricating oil discharge hole,   the lubricating oil discharge hole is closed by a drain plug that is attachable and detachable,   the lubricating oil amount adjustment passage, the lubricating oil amount adjustment plug and the drain plug are assembled coaxially, and   the lubricating oil amount adjustment plug is capable of abutting on an abutment portion that is formed in the lubricating oil amount adjustment passage.   
     
     
         2 . The lubricating oil discharge and filling structure according to  claim 1 , comprising:
 a falling-off prevention device that prevents screwing of the screw portion and the screw groove from being released when the lubricating oil amount adjustment plug is moved, in at least either one of the lubricating oil amount adjustment passage or the lubricating oil amount adjustment plug.   
     
     
         3 . The lubricating oil discharge and filling structure according to  claim 2 ,
 wherein the falling-off prevention device is assembled to an upper end of the lubricating oil amount adjustment wall, and includes a stopper portion that protrudes to the lubricating oil amount adjustment plug.   
     
     
         4 . The lubricating oil discharge and filling structure according to  claim 2 ,
 wherein the falling-off prevention device is provided extensively from a lower end of the lubricating oil amount adjustment plug, and includes a stopper portion capable of abutting on an abutment surface that is formed in the lubricating oil amount adjustment passage.   
     
     
         5 . The lubricating oil discharge and filling structure according to  claim 1 ,
 wherein the lubricating oil amount adjustment plug screws onto an engagement member that is inserted into the lubricating oil amount adjustment passage, and   the engagement member has the screw groove that is formed on an outer periphery, and an abutment portion on which the lubricating oil amount adjustment plug abuts.   
     
     
         6 . The lubricating oil discharge and filling structure according to  claim 5 ,
 wherein a second lubricating oil discharge hole that is closed by the sealing wall is formed in an outer circumferential surface of the engagement member.   
     
     
         7 . The lubricating oil discharge and filling structure according to  claim 1 ,
 wherein the drain plug includes a seal member that abuts on an inner wall of the lubricating oil amount adjustment passage, and a screwing portion that screws onto an outer wall of the lubricating oil amount adjustment passage.   
     
     
         8 . The lubricating oil discharge and filling structure according to  claim 7 ,
 wherein the drain plug includes a loosening prevention mechanism that is engageable with the oil pan.   
     
     
         9 . The lubricating oil discharge and filling structure according to  claim 7 ,
 wherein the seal member and the screwing portion are superimposed in a radial direction of the lubricating oil amount adjustment passage.