Patent Publication Number: US-11041432-B1

Title: Cylinder structure of internal combustion engine

Description:
FIELD OF THE INVENTION 
     The present invention relates to a cylinder, and more particularly to a cylinder structure of an internal combustion engine which is manufactured easily and quickly. 
     BACKGROUND OF THE INVENTION 
     A conventional cylinder structure of an internal combustion engine is disclosed in U.S. Pat. No. 10,526,997 and contains a body, a cylinder head, a molybdenum coating layer, and two lids. The molybdenum coating layer is configured to enhance abrasion resistance and heat dissipation of the body. Preferably, the molybdenum coating layer is detachable to be replaced easily. 
     When connecting the two lids to the body, an airtight material (such as anaerobic curing acrylate) is adhered on the body auxiliarily so as to close a first scavenging orifice and a second scavenging orifice, and an air conduit is defined between a respective lid and the external fence and is formed in an inverted U shape, thus obtaining heat dissipation. 
     However, it is a long time to wait solidification of the airtight material. For example, a semi-finished cylinder is moved to another work platform for solidification after gluing. During the solidification, the two lids are removed easily in case semi-finished cylinder is delivered by an external force, and an airtight effect reduces as well. 
     The present invention has arisen to mitigate and/or obviate the afore-described disadvantages. 
     SUMMARY OF THE INVENTION 
     The primary objective of the present invention is to provide a cylinder structure of an internal combustion engine which contains two lids and a cylinder connected securely and easily by using multiple positioning elements before the airtight material solidifies. 
     To obtain the above objective, a cylinder structure of an internal combustion engine provided by the present invention contains: a body, two lids, and multiple positioning elements. 
     The body has a combustion chamber surrounded by an external fence and a cylinder head, an air inlet defined on a first side of the combustion chamber, an air outlet formed on a second side of the combustion chamber, and two scavenging units formed on the combustion chamber and intersecting with the air inlet and the air outlet. A respective scavenging unit has a first scavenging orifice, a second scavenging orifice, a first fringe and a second fringe which are configured to surround the first scavenging orifice and the second scavenging orifice, a first engagement portion arranged between the first fringe and the second fringe, and a first fixing orifice defined on the first fringe. 
     The two lids cover the two scavenging units so as to close the first scavenging orifice and the second scavenging orifice, and an air conduit is defined between a respective lid and the external fence, such that when the internal combustion engine scavenges exhaust airs, the exhaust airs are drawn into the first scavenging orifice and are discharged out of the air outlet via the air conduit and the second scavenging orifice, and the respective lid has multiple second fixing orifices located on an internal wall thereof. 
     A respective positioning element has a stem and at least one hook which extends from a first end of the stem, the stem extends into the first engagement portion along the first fixing orifice and a respective second fixing orifice, and the stem is rotated so that the at least one hook contacts with the respective lid, and the respective lid is connected with the body. 
     Thereby, the two lids and the body are connected easily by way of the multiple positioning elements and are adhered securely. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view showing the exploded components of a cylinder structure of an internal combustion engine according to a preferred embodiment of the present invention. 
         FIG. 2  is a cross sectional view showing the assembly of the cylinder structure of the internal combustion engine according to the preferred embodiment of the present invention. 
         FIG. 3  is another cross sectional view showing the assembly of the cylinder structure of the internal combustion engine according to the preferred embodiment of the present invention. 
         FIG. 4  is also another cross sectional view showing the assembly of the cylinder structure of the internal combustion engine according to the preferred embodiment of the present invention. 
         FIG. 5  is an amplified cross-sectional view showing the operation of a part of the cylinder structure of the internal combustion engine according to the preferred embodiment of the present invention. 
         FIG. 6  is another amplified cross-sectional view showing the operation of a part of the cylinder structure of the internal combustion engine according to the preferred embodiment of the present invention. 
         FIG. 7  is a cross sectional view showing the operation of a part of the cylinder structure of the internal combustion engine according to the preferred embodiment of the present invention. 
         FIG. 8  is also another amplified cross-sectional view showing the operation of a part of the cylinder structure of the internal combustion engine according to the preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A cylinder structure of an internal combustion engine according to a preferred embodiment of the present invention comprises: a cylinder  100  including a piston  60  received in the cylinder  100 , and a crankcase  70  connected on a bottom of the cylinder  100 , the crankcase  70  having a crankshaft  71  accommodated in the crankcase  70 , and the crankcase  70  having a connection rod  72  connected between the crankshaft  71  and the piston  60  so as to actuate the piston  60  to move upward and downward, as shown in  FIG. 2 . 
     With reference to  FIGS. 1-3 , the cylinder  100  includes a body  10 , a cylinder head  20 , a molybdenum coating layer  30 , two lids  40 , and multiple positioning elements  80 . 
     The body  10  is die-casting molded from aluminum and has a combustion chamber  111  surrounded by an external fence  11  and the cylinder head  20 , an air inlet  12  defined on a first side of the combustion chamber  111 , an air outlet  13  formed on a second side of the combustion chamber  111 , and two scavenging units  50  formed on the combustion chamber  111  and intersecting with the air inlet  12  and the air outlet  13 . 
     A respective scavenging unit  50  has a groove  53  surrounded by a first fringe  51  and a second fringe  52 , a rib  54  horizontally connected with a middle section of the groove  53 , a first engagement portion  55  arranged between the first fringe  51  and the second fringe  52 , and a first fixing orifice  56  defined on the first fringe  51 , wherein a first scavenging orifice  57  and a second scavenging orifice  58  are formed among two sides of the rib  54  and the groove  53 , a thickness of the rib  54  is less than a depth of the groove  53 , an inner wall of the rib  54  flushes with an internal portion  112  of the external fence  11 . Furthermore, a thickness W 1  of the rib  54  is less than a depth W 2  of the groove  53 , and the inner wall  541  of the rib  54  flushes with the internal portion  112  of the external fence  11 , as illustrated in  FIGS. 1 and 3 . 
     The molybdenum coating layer  30  is a molybdenum film coated on the internal portion  112  of the external fence  11  of the body  10 , and the molybdenum coating layer  30  is selected from any one of Molybdenum disulfide (MoS 2), Molybdenum Dialkyl Dithiocarbamate (MoDTC), Molybdenum Dialkyldithiophosphoramidate, and an organic molybdenum mixture. 
     A respective lid  40  extrudes outward and covers the respective scavenging unit  50  so as to close the first scavenging orifice  57  and the second scavenging orifice  58 , and an air conduit  59  is defined between the respective lid  40  and the external fence  11  and is formed in an U shape, such that when the internal combustion engine scavenges exhaust airs, the exhaust airs are drawn into the first scavenging orifice  51  and are discharged out of the air outlet  13  via the air conduit  55  and the second scavenging orifice  58 . 
     Referring to  FIGS. 4 and 5 , the respective lid  40  has a second engagement portion  41  formed on a peripheral side thereof, and the respective lid  40  has multiple second fixing orifices  42  passing through the second engagement portion  41  and being coaxial to the first fixing orifice  56 . In this embodiment, the first engagement portion  55  of the body  10  is concaved, and the second engagement portion  41  of the respective lid  40  is convex. 
     As shown in  FIG. 5 , a respective positioning element  80  has a stem  81 , multiple hooks  82  extending from a first end of the stem  81 , a spring  83 , a protrusion  84  fixed on a second end of the stem  81 , a threaded orifice  85  defined on the second end of the stem  81 , and a screw peg  86  extending from the protrusion  84 . In assembly, the spring  83  is fitted on the stem  81 , and the screw peg  86  of the protrusion  84  is screwed in the threaded orifice  85  of the stem  81 , such that the stem  81 , the spring  83 , and the protrusion  84  are connected, and the spring  83  abuts against the multiple hooks  82  and the protrusion  84 . 
     The first fixing orifice  56  of the body  10  has a first receiving portion  561 , a diameter of the first receiving portion  561  is more than a diameter of the stem  81 , and the first fixing orifice  56  further has multiple first extensions  562  extending outward from the first receiving portion  561 . A respective second fixing orifice  42  of the respective lid  40  has a second receiving portion  421 , and a diameter of the second receiving portion  421  is more than a diameter of the stem  81 , the respective second fixing orifice  42  further has multiple second extensions  422  extending outward from the second receiving portion  421 . 
     When connecting the respective lid  40 , as shown in  FIG. 5 , an airtight material  43  is fed into the first engagement portion  55  of the body  10 , and the second engagement portion  41  of the respective lid  40  is inserted into the first engagement portion  55  of the body  10 . Referring further to  FIGS. 6 and 7 , the stem  81  of the respective positioning element  80  is aligned with the first receiving portion  561  of the first fixing orifice  56  of the body  10 , the multiple hooks  82  of the stem  81  are aligned with the multiple first extensions  562 , and the respective positioning element  80  is inserted through the first fixing orifice  56  and the respective second fixing orifice  42  so that the stem  81  and the multiple hooks  82  are inserted through the second receiving portion  421  and the multiple second extensions  422  of the respective second fixing orifice  42 , the protrusion  84  is grasped manually, and the stem  81  is rotated (as shown in  FIG. 7 ) so that the multiple hooks  82  detach from the multiple second extensions  422  and engage with an internal wall of the respective lid  40 , thus connecting the respective lid  40 . Thereafter, the respective positioning element  80 , the respective lid  40 , and the body  10  are fixed by the spring  83 . Preferably, the stem  81  is rotated smoothly because the airtight material  43  does not solidify when rotating the stem  81 . 
     With reference to  FIG. 8 , after the respective lid  40  is connected with the body  10 , the screw peg  86  of the protrusion  84  is removed from the threaded orifice  85  of the stem  81 , such that the protrusion  84  is detachable from the stem  81 , thus obtaining aesthetics appearance of the body  10 . 
     Thereby, the respective positioning element  80 , the respective lid  40 , and the body  10  are connected, and when a semi-finished cylinder is moved to a work platform for solidifying, the respective lid  40  is connected with the body  10  securely even through the respective lid  40  does not solidify. Preferably, the respective lid  40  is connected with the body  10  easily, and an airtight effect produces between the respective lid  40  and the body  10  to close the first scavenging orifice  57  and the second scavenging orifice  58  tightly. In this embodiment, the airtight material  43  is anaerobic curing acrylate. 
     Accordingly, the cylinder structure of the internal combustion engine is connected by the multiple positioning elements to facilitate secure connection of the respective lid and the body. Preferably, the molybdenum coating layer is coated on the internal portion of the body to enhance lubrication, abrasion resistance, and heat dissipation and to reduce friction. 
     While the preferred embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.