Patent Application
20190218994
The present invention relates to a cylinder, and more particularly to a cylinder structure of an internal combustion engine.
Referring to
Because the internal combustion engine purges the gas so as to remove the exhaust gas from the crankcase, it is difficult to arrange the gas inlet 7, the gas outlet 9, and the purge orifice 9 in the cylinder 1. To satisfy the gas purge of the purge orifice 9, the body is winging and is complicated, so it is impossible to cut and machine the cylinder by using a machining center. To overcome above-mentioned problem, the cylinder is sand casted (or gravity casted) by mating with precision dewaxing so as to obtain casting components having above-mentioned structure and to form the purge orifice integrally formed with the body of the cylinder. However, the cylinder is produced slowly at a high fabrication cost.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
The primary aspect of the present invention is to provide a cylinder structure of an internal combustion engine which forms the purge orifices on the predetermined positions of the gas conduit after die casting the body of the cylinder so that the cutting tool cuts and machines an interior of the body, and two shells cover the purge orifices so as to produce the winding gas conduit, thus die casting the cylinder quickly.
Further aspect of the present invention is to provide a cylinder structure of an internal combustion engine which contains the titanium plating layer which is a flexible film or is stiff so as enhance wear resistance and heat dissipation.
Another aspect of the present invention is to provide a cylinder structure of an internal combustion engine which contains the titanium plating layer which is a flexible film so as to be replaceable after a period of using time.
To obtain above-mentioned aspects, a cylinder structure of an internal combustion engine provided by the present invention contains: a body, a titanium plating layer, and two shells.
The body is die casted and includes a combustion chamber surrounded by a peripheral fence and a cylinder head, a gas inlet and a gas outlet which are defined on two sides of the combustion chamber respectively, two gas purge units arranged beside the combustion chamber and interlacing with the gas inlet and the gas outlet. The two gas purge units has a first purge orifice and a second purge orifice, each the gas outlet is proximate to the combustion chamber and is higher than the gas inlet, two height positions of the first purge orifice and the second purge orifice of each gas purge unit are between the gas inlet and the gas outlet respectively.
The titanium plating layer is located on the second internal fringe of the peripheral fence of the body.
Each of the two shells covers each gas purge unit so as to close the first purge orifice and the second purge orifice and to define a gas conduit among the first purge orifice, the second purge orifice, and the peripheral fence, such that when the internal combustion engine purges gas, exhaust gas flows through the gas conduit from the first purge orifice and discharges out of the gas outlet from the second purge orifice.
The cylinder of the present invention is die casted, and the first purge orifice and the second purge orifice are formed on the body directly, and each shell covers the first purge orifice and the second purge orifice so as to define the gas conduit in the body, such that the internal combustion engine purges the gas effectively, and the gas conduit is not formed in the low wax casting manner, thus simplifying manufacture of the body of the cylinder at a low fabrication cost.
A cylinder structure of an internal combustion engine according to the present invention comprises: a cylinder 100 in which a piston 60 is accommodated, a bottom of the cylinder 100 being connected with a crankcase 70, and the crankcase 70 having a crankshaft 71 and a connection rod 72 coupled between the crankshaft 71 and the piston 60 so as to drive the piston 60 to move upward and downward, as shown in
With reference to
The body 10 is die casted from aluminum, and the body 10 includes a combustion chamber 111 surrounded by a peripheral fence 11 and the cylinder head 20, a gas inlet 12 and a gas outlet 13 which are defined on two sides of the combustion chamber 111 respectively. The body 10 further includes two gas purge units 50 arranged beside the combustion chamber 111 and interlacing with the gas inlet 12 and the gas outlet 13, wherein the two gas purge units 50 have a first purge orifice 51 and a second purge orifice 52, the gas outlet 13 is proximate to the combustion chamber 111 and is higher than the gas inlet 12, wherein two height positions of the first purge orifice 51 and the second purge orifice 52 of each gas purge unit 50 are between the gas inlet 12 and the gas outlet 13 respectively. Each gas purge unit 50 further has a groove 53 and a rib 54 horizontally connected on a middle section of the groove 52, wherein the first purge orifice 51 and the second purge orifice 52 are defined between two sides of the rib 54 and the groove 53, a thickness W1 of the rib 54 is less than a depth W2 of the groove 53, and a first internal fringe 541 of the rib 54 flushes with a second internal fringe 112 of the combustion chamber 111, as shown in
The titanium plating layer 30 is a flexible film coated on the second internal fringe 112 of the peripheral fence 11 of the body 10, and the flexible film is made of nickel of 70% to 90%, titanium of 5% to 15%, silicon carbide of 5% to 15% so as to form a nickel-based composite plating layer, i.e., the nickel silicon carbide plating layer.
Each of the two shells 40 is protruded and covers each gas purge unit 50 so as to close the first purge orifice 51 and the second purge orifice 52 and to define a gas conduit 55 in an inverted U shape among the first purge orifice 51, the second purge orifice 52, and the peripheral fence 11, such that when the internal combustion engine purges gas, exhaust gas flows through the gas conduit 55 from the first purge orifice 51 and discharges out of the gas outlet 13 from the second purge orifice 52.
Each shell 40 includes a first engagement portion 41 formed on a periphery thereof, and the body 10 further includes two second engagement portions 14 arranged outside each gas purge unit 50, wherein the first engagement portion 41 of each shell 40 corresponds to each of the two second engagement portions 14 and is adhered with each second engagement portion 14 by way of an airtight material 42 so that each shell 40 connects on the body 10. The airtight material 42 is anaerobic curing acrylics. With reference to
The first purge orifice 51 of each gas purge unit 50 is adjacent to a bottom of the body 10 and its height is not lower than the gas inlet 12, and the second purge orifice 52 of each gas purge unit 51 is proximate to the combustion chamber 111 and its height is higher than the gas inlet 12 and is lower than the gas outlet 13.
Referring to
With reference to
The titanium plating layers 30, 80 are formed on the second internal fringe 112 of the body 10 respectively so as to enhance wear resistance and heat dissipation. Preferably, the titanium plating layer 80 is replaceable easily after a period of using time.
The conventional cylinder of the internal combustion engine is manufactured in a low wax casting manner so as to form the first purge orifice and the second purge orifice on the body of the cylinder, thus producing the cylinder slowly.
However, the cylinder is die casted, for example, the first purge orifice 51 and the second purge orifice 52 of the body 10 are formed on the body 10 directly, and each shell 40 covers the first purge orifice 51 and the second purge orifice 52 so as to close the body 10 matingly. Each shell 40 covers each gas purge unit 50 so as to define the gas conduit 55 among the first purge orifice 51, the second purge orifice 52, and the peripheral fence 11, such that when the internal combustion engine purges the gas, and the gas conduit 55 is not formed in the low wax casting manner, thus simplifying manufacture of the body of the cylinder.
Accordingly, the body 10 and each two shell 40 are die casted, and each shell 40 is adhered so as to produce the boy easily and quickly at a low fabrication cost.
Preferably, each two shell 40 is protruded so as to increase a size of the gas conduit 55 among the first purge orifice 51, the second purge orifice 52, and each shell 40, thus purging the gas efficiently.
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.
