Expansible chamber devices – Piston – With separable means for pivotally mounting connecting rod...
Patent
1995-11-14
1997-07-29
Nguyen, Hoang
Expansible chamber devices
Piston
With separable means for pivotally mounting connecting rod...
1231973, F16J 114
Patent
active
056513046
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to internal combustion engines and more particularly to a piston assembly incorporating a novel interconnection between piston and connecting rod.
BACKGROUND OF THE INVENTION
Ignition in an internal combustion engine, takes place just prior to the piston reaching "top dead centre". Combustion takes place with considerable expansion of the mixture within the combustion chamber.
It is advantageous for combustion to take place at as high a pressure as possible. Engines are usually designed to have a compression ratio of 8:1 to 9:1. However as the piston is descending combustion is still taking place and accordingly, pressure within the combustion chamber is reduced from an optimum. This results in incomplete combustion of the fuel which in turn leads to loss of power and pollution problems.
Disclosed in International Application PCT/CA92/00522 is a piston rod and piston connection which addresses the above issue. The upper end of the piston rod is provided with raised portions which engage the underside of the piston crown. As the connecting rod rotates angularly, the piston is caused to move away from the other end of the connecting rod.
Similar such mechanisms are disclosed in U.S. Pat. Nos. 1,431,617, 4,515,441, 2,260,240 and 2,574,934.
OBJECT OF THE INVENTION
It is an object of the present invention to substantially ameliorate some of the disadvantages with prior an piston assemblies or to provide a meaningful alternative to conventional piston and connecting rod design.
SUMMARY OF THE INVENTION
There is disclosed herein a piston and connecting rod assembly for an internal combustion engine, said assembly comprising: from said piston end during relative pivoting of said piston through a predetermined angle relative to said piston end.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred form of the present invention will now be described by way of example with reference to the accompanying drawings wherein:
FIG. 1 is a schematic side elevation of a connecting rod and piston;
FIG. 2 is a schematic end elevation of the connecting rod and piston of FIG. 1;
FIG. 3 is a schematic parts exploded perspective view of the connecting rod of FIGS. 1 and 2; and
BEST MODE AND OTHER EMBODIMENTS OF THE PRESENT INVENTION
In FIGS. 1, 2 and 3 there is schematically depicted a piston and connecting rod assembly 140. The assembly 140 includes a connecting rod 141 which connects the piston 142 to the crank shaft of an internal combustion reciprocating engine. The connecting rod 141 includes a pair of guide blocks 143 which are received within circular bearing elements 144. More particularly, each of the bearing elements 144 is provided with an aperture in the form of an elongated rectangular slot 145. Each slot 145 has longitudinal sides 146 which slidably engage the elongated sides 147 of the blocks 143. However, the guides 143 have a total length (extending in the longitudinal direction of extension of the connecting rod 141) which is shorter than the length of the sides 146. Accordingly, the blocks 143 can move longitudinally along the slots 145 while being engaged by the sides 146. Extending transversely outwardly from the blocks 147, along a common axis, are pins 148.
The extremity of the connecting rod 141 is provided with a recess 149 having a surface 150 that conforms to the surface of a cylinder. Located in the recess 149 is a bearing element 151 having an external surface matching the surface 150. The bearing element 151 is freely rotatable in the recess 149. The bearing element 151 has a planar bearing surface 152.
The piston 142 has a pair of piston skirt portions 153 and a piston crown 154. The crown 154 has an internal surface 155 provided with an inclined bearing element 156 having a generally planar surface 157. The element 156 is fixed with respect to the crown 154. The surface 152 of the bearing element 150 slidably engages the surface 157.
The crown 154 is provided with a pair of threaded passages 159 which are engaged by a pair of threaded fast
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Allsopp Judith Olive
Allsopp Neville Thomas
Nguyen Hoang
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