Engine valving and porting

Claim 2

A fuel intake system for a variable speed two-cycle crankcase compression internal combustion engine having a piston working in a cylinder with transfer porting extended between the compression and the intake sides of the piston and with an intake port adapted to communicate with the cylinder at the intake side of the piston when the piston is positioned to block the transfer porting, a fuel intake chamber for receiving fuel from a supply source and for delivering the fuel to the intake port, a ported valve seat presented downstream of the fuel flow through the intake chamber, a primary reed valve covering the valve port and being sufficiently flexible to open the port under the influence of decrease in pressure in the intake chamber incident to high speed engine operation but being sufficiently rigid to remain closed under the influence of decrease in pressure in the intake chamber incident to low speed engine operation, said primary reed having a secondary valve port therethrough of smaller size than the port through the valve seat, and a secondary reed valve covering the secondary port and being sufficiently flexible to open the secondary port under the influence of decrease in pressure in the intake chamber incident to engine operation either at said high speed or at said low speed, the primary and secondary reeds being fixed at overlying edge portions thereof and in which the secondary reed is shorter than the primary reed in the direction toward the edges opposite to the fixed edges.

Claim 3

A reed valve assembly for controlling the flow of fuel to the intake port of a variable speed, crankcase compression engine comprising a valve body having two converging surfaces, the surfaces being joined by a transverse apex member, an opening in each of the surfaces, a primary reed overlying the opening on each of the surfaces, a vent formed in each of the primary reeds, each vent being positioned in a portion of the primary reed which overlays the opening over which the reed is positioned, the area of each of the vents being less than the area of each of the openings, secondary reeds overlying each of the vents, the secondary reeds having smaller area and being more yieldable than the primary reeds.

Claim 4

A reed valve assembly for controlling the flow of fuel to the intake port of a variable speed, crankcase compression engine comprising a valve body having two converging surfaces, the surfaces being joined by a transverse apex member, an opening in each of the surfaces, a primary reed overlying the opening on each of the surfaces, a vent formed in each of the primary reeds, each vent being positioned in a portion of the primary reed which overlays the opening over which the reed is positioned, the area of each of the vents being less than the area of each of the openings, secondary reeds overlying each of the vents, the secondary reeds having smaller area and being more yieldable than the primary reeds.

Claim 5

A valve assembly as in claim 2 wherein lateral side edges of the primary reeds extend beyond the lateral side edges of the secondary reeds.

Claim 6

A valve assembly as in claim 2 wherein the apex member has a subsonic aerodynamic surface formed thereon.

Claim 7

A valve assembly as in claim 2 wherein the vent formed in each of the primary reeds is extended to portions of the reeds adjacent the securing means.

Claim 8

A fuel intake system for a variable speed two-cycle crankcase compression internal combustion engine having a piston working in a cylinder, a crankcase, transfer passages extending between the crankcase and the combustion side of the piston terminating in transfer ports in the cylinder spaced from each other circumferentially of the cylinder, a pair of intake channels in fluid communication with two intake ports in the cylinder, the intake ports arranged intermediate the transfer ports, a valve assembly positioned in each of the channels, a first one of the channels aligned with one of the intake ports, and a second one of the channels aligned with the other of the intake ports, each valve assembly comprising a hollow wedge-shaped body having an inlet in its base end, a pair of imperforate opposed parallel end walls and a pair of inclined walls meeting along an apex line presented downstream of the fuel flow, the valve bodIes being oriented so that the opposed end walls of each valve body are transverse to the axis of the cylinder and so that the apex line of each valve assembly generally parallels the direction of movement of the piston, ports in the inclined walls of the valve bodies and reed petals cooperating with the ports to control the flow of fluid through the ports.

Claim 9

A fuel intake system for a variable speed two-cycle crankcase compression internal combustion engine having a piston working in a cylinder, a crankcase, transfer passages extending between the crankcase and the combustion side of the piston terminating in transfer ports in the cylinder spaced from each other circumferentially of the cylinder, a pair of intake channels in fluid communication with two intake ports in the cylinder, the intake ports arranged intermediate the transfer ports, a valve assembly positioned in each of the channels, a first one of the channels aligned with one of the intake ports, and a second one of the channels aligned with the other of the intake ports, each valve assembly comprising a hollow wedge-shaped body having an inlet in its base end, a pair of imperforate opposed parallel end walls and a pair of inclined walls meeting along an apex line presented downstream of the fuel flow, the valve bodIes being oriented so that the opposed end walls of each valve body are transverse to the axis of the cylinder and so that the apex line of each valve assembly generally parallels the direction of movement of the piston, ports in the inclined walls of the valve bodies and reed petals cooperating with the ports to control the flow of fluid through the ports.

Claim 10

An engine in accordance with claim 6 wherein the reed valves include a primary reed, a vent in the primary reed, and a secondary reed more yieldable than the primary reed positioned to control the flow of fluid through the vent in the primary reed.

Claim 11

A fuel intake system for a variable speed, two-cycle crankcase compression internal combustion engine having a skirted piston working in a cylinder with transfer porting extending between the crankcase and the combustion side of the piston, an intake port positioned in the cylinder to provide for direct communication with the crankcase when the piston is positioned to block the transfer porting, a fuel intake passage for receiving fuel from a supply source and delivering the fuel to the intake port, and a reed valve assembly for controlling the flow of fuel through the intake passage, the reed valve assembly including a hollow wedge-shaped valve body in the fuel intake passage and having an inlet in its base end, a pair of opposed imperforate end walls and a pair of inclined walls arranged in inclined planes meeting along an apex line, the valve body being oriented so that the apex line generally parallels the axis of the cylinder, the axis of the fuel intake passage from the intake port to the region of the valve body being extended generally radially of the cylinder and providing delivery of the fuel from the valve body through the intake port in substantially straightline flow, the piston skirt having unvalved passage means of such vertical dimension and so positioned with respect to said intake port, as to provide fluid communication between the intake port and the crankcase whenever the piston is positioned to block the intake port, including the piston position in the region of bottom dead center, whereby to ensure fluid communication between the intake port and crankcase throughout the engine cycle.

Claim 12

A fuel intake system for a variable speed, two-cycle crankcase compression internal combustion engine having a skirted piston working in a cylinder with transfer porting extending between the crankcase and the combustion side of the piston, an intake port positioned in the cylinder to provide for direct communication with the crankcase when the piston is positioned to block the transfer porting, a fuel intake passage for receiving fuel from a supply source and delivering the fuel to the intake port, and a reed valve assembly for controlling the flow of fuel through the intake passage, the reed valve assembly including a hollow wedge-shaped valve body in the fuel intake passage and having an inlet in its base end, a pair of opposed imperforate end walls and a pair of inclined walls arranged in inclined planes meeting along an apex line, the valve body being oriented so that the apex line generally parallels the axis of the cylinder, the axis of the fuel intake passage from the intake port to the region of the valve body being extended generally radially of the cylinder and providing delivery of the fuel from the valve body through the intake port in substantially straightline flow, the piston skirt having unvalved passage means of such vertical dimension and so positioned with respect to said intake port, as to provide fluid communication between the intake port and the crankcase whenever the piston is positioned to block the intake port, including the piston position in the region of bottom dead center, whereby to ensure fluid communication between the intake port and crankcase throughout the engine cycle.

Claim 13

A fuel supply system for a variable speed internal combustion engine having fuel intake porting subject to pressure fluctuations with variation in engine speed, comprising a hollow wedge shaped valve body having an inlet in its base end, having a pair of spaced and opposed end walls and a pair of inclined walls meeting along the apex line of the body and having valve ports therein, and assemblies of reed valve petals for the valve ports at the downstream sides of the inclined walls, each assembly comprising a primary petal and a superimposed secondary petal connected at adjacent ends thereof with the valve body between a valve port and the base end of the body and having their other ends free to flex away from the valve body, the primary reed petal being extended over said valve port and having a vent in registry with the underlying valve port, the secondary reed petal extending over said vent but being shorter and more yieldable than the primary reed petal, the secondary reed petal being sufficiently flexible to open under pressure conditions incident to operation of the engine at any speed and the primary reed petal being sufficiently flexible to open under pressure conditions incident to operation of the engine at a high range of speeds but being sufficiently rigid to remain closed under pressure conditions incident to engine operation at a low range of speeds.

Claim 14

A fuel supply system for a variable speed internal combustion engine having fuel intake porting subject to pressure fluctuations with variation in engine speed, comprising a hollow wedge shaped valve body having an inlet in its base end, having a pair of spaced and opposed end walls and a pair of inclined walls meeting along the apex line of the body and having valve ports therein, and assemblies of reed valve petals for the valve ports at the downstream sides of the inclined walls, each assembly comprising a primary petal and a superimposed secondary petal connected at adjacent ends thereof with the valve body between a valve port and the base end of the body and having their other ends free to flex away from the valve body, the primary reed petal being extended over said valve port and having a vent in registry with the underlying valve port, the secondary reed petal extending over said vent but being shorter and more yieldable than the primary reed petal, the secondary reed petal being sufficiently flexible to open under pressure conditions incident to operation of the engine at any speed and the primary reed petal being sufficiently flexible to open under pressure conditions incident to operation of the engine at a high range of speeds but being sufficiently rigid to remain closed under pressure conditions incident to engine operation at a low range of speeds.

Claim 15

A fuel supply system for a variable speed internal combustion engine having fuel intake porting subject to pressure fluctuations with variation in engine speed, comprising a valve housing defining an intake passage adapted to deliver fuel to the intake porting of such an engine, an inclined wall in said passage extended in a plane obliquely angled to the axis of the passage and havinG a valve port therein, and an assembly of reed valve petals for said valve port positioned at the downstream side of said inclined wall and comprising a primary petal and a superimposed secondary petal connected at adjacent ends thereof with the inclined wall toward the upstream end thereof and having their other ends free to flex away from the inclined wall, the primary reed petal being extended over said valve port and having a vent in registry with the underlying port and spaced from the free end of the primary reed petal, the secondary reed petal extending over said vent but being shorter and more yieldable than the primary reed petal, the secondary reed petal being sufficiently flexible to open under pressure conditions incident to operation of the engine at any speed and the primary reed petal being sufficiently flexible to open under pressure conditions incident to operation of the engine at a high range of speeds but being sufficiently rigid to remain closed under pressure conditions incident to engine operation at a low range of speeds.

Claim 16

A fuel supply system for a variable speed internal combustion engine having fuel intake porting subject to pressure fluctuations with variation in engine speed, comprising a valve housing defining an intake passage adapted to deliver fuel to the intake porting of such an engine, an inclined wall in said passage extended in a plane obliquely angled to the axis of the passage and havinG a valve port therein, and an assembly of reed valve petals for said valve port positioned at the downstream side of said inclined wall and comprising a primary petal and a superimposed secondary petal connected at adjacent ends thereof with the inclined wall toward the upstream end thereof and having their other ends free to flex away from the inclined wall, the primary reed petal being extended over said valve port and having a vent in registry with the underlying port and spaced from the free end of the primary reed petal, the secondary reed petal extending over said vent but being shorter and more yieldable than the primary reed petal, the secondary reed petal being sufficiently flexible to open under pressure conditions incident to operation of the engine at any speed and the primary reed petal being sufficiently flexible to open under pressure conditions incident to operation of the engine at a high range of speeds but being sufficiently rigid to remain closed under pressure conditions incident to engine operation at a low range of speeds.