Supercharged two-stroke engine with upper piston extensions

• US 20060048729A1
• Filed: 08/18/2005
• Published: 03/09/2006
• Est. Priority Date: 03/17/2004
• Status: Active Grant

• Current Assignee: Craig S. Beshore
• Original Assignee: Craig S. Beshore
• Inventors: Beshore, Craig S.
• Granted Patent: US 7,255,071 B2
• Time in Patent Office: Days
• US Class Current: 123/65.R
• CPC Class Codes: F01L 11/02 in piston
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F02B 75/02 Engines characterised by their cycles, e.g. six-stroke
• CPC Class Codes: F02B 75/28 Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders arranged oppositely relative to main shaft F02B75/24
• CPC Class Codes: F02B 75/30 with one working piston sliding inside another
• CPC Class Codes: F04B 39/1073 the members being reed valves
• CPC Class Codes: F04B 5/00 Machines or pumps with differential-surface pistons
• CPC Class Codes: F04B 53/1037 Flap valves

Abstract

An apparatus useful in a two-stroke cycle engine or in a pump as a piston disposed within a piston cylinder. The piston cylinder has an intermediate piston cylinder head disposed transversely across the interior of the piston cylinder. The piston has at least one upright extension member extending upwardly from the lower portion. A piston top wall is disposed transversely to the piston cylinder side wall and is attached to the upper portion of the upright extension member of the piston. An upper chamber is defined above the piston top wall. An intermediate chamber is defined immediately below the piston top wall and a lower chamber is defined below the intermediate piston cylinder head. A tube connects the upper chamber with the lower chamber.

Claims

1. An apparatus useful in a two-stroke cycle engine, the apparatus comprising:

(a) a piston cylinder having a piston cylinder upper portion, a piston cylinder lower portion, a piston cylinder side wall with an interior surface and a piston cylinder top cover, the piston cylinder further having first and second intake ports defined within the piston cylinder upper portion and an exhaust port defined within the piston cylinder lower portion;

(b) an intermediate piston cylinder head fixedly disposed within the piston cylinder so as to separate the piston cylinder upper portion from the piston cylinder lower portion, the piston cylinder head extending transversely across the interior of the piston cylinder and having an upper surface and a lower surface, the piston cylinder head being disposed within the piston cylinder so as to define at least one head gap between the interior surface of the piston cylinder side wall and the piston cylinder head;

(c) a piston slidably disposed within the piston cylinder, the piston having a piston side wall with an exterior surface, the piston being sized and dimensioned to be operatively sealable with the interior surface of the piston cylinder side wall, the piston also having a lower piston portion with a lower piston portion upper surface disposed within the lower piston cylinder portion and an upper piston portion comprising at least one upright extension member, the at least one upright extension member having an uppermost portion, the at least one upright extension member extending upwardly from the lower piston portion through the at least one head gap and being extendable upwardly into the upper cylinder portion, the lower piston portion upper surface being adapted to cooperate with the interior surface of the piston cylinder side wall, the at least one upright extension member and the lower surface of the piston cylinder head to define an enclosed lower chamber, the piston being operatively connected to a crank shaft by a piston rod and adapted to reciprocate within the piston cylinder between an upward cycle and a downward cycle;

(d) a piston top wall disposed transversely within the piston cylinder and attached to the uppermost portion of the at least one upright extension member, the piston top wall being adapted to cooperate with the interior surface of the piston cylinder side wall to define an enclosed upper chamber in the upper cylinder portion immediately above the piston top wall, the piston top wall also being adapted to cooperate with the at least one upright extension member, the interior surface of the piston cylinder side wall and the upper surface of the piston cylinder head to define an enclosed intermediate chamber immediately below the piston top wall;

(e) a tube connecting the upper chamber to the lower chamber in fluid type communication;

(f) an upper tube valve for alternatively (i) allowing the flow of fluids between the upper chamber and the tube (ii) preventing the flow of fluids between the upper chamber and the tube;

(g) a lower tube valve for alternatively (i) allowing the flow of fluids between the tube and the lower chamber and (ii) preventing the flow of fluids between the tube and the lower chamber;

(h) a first upper chamber intake valve for controlling the flow of fluids to the first intake port defined within the piston cylinder upper portion;

(i) a second upper chamber intake valve for controlling the flow of fluids to the second intake port defined within the piston cylinder upper portion;

(j) means for alternatively allowing the transfer of fluids between the intermediate chamber and the lower chamber and for alternatively preventing the transfer of fluids between the intermediate chamber and the lower chamber; and

(k) an igniter disposed proximate to the lower chamber for igniting fluids within the lower chamber.

2. An apparatus useful in a two-stroke cycle engine, the apparatus comprising:

(a) a piston cylinder having a piston cylinder upper portion, a piston cylinder lower portion, a piston cylinder side wall with an interior surface and a piston cylinder top cover, the piston cylinder further having first and second intake ports defined within the piston cylinder upper portion and an exhaust port defined within the piston cylinder lower portion;

(b) an intermediate piston cylinder head fixedly disposed within the piston cylinder so as to separate the piston cylinder upper portion from the piston cylinder lower portion, the piston cylinder head extending transversely across the interior of the piston cylinder and having an upper surface and a lower surface, the piston cylinder head being disposed within the piston cylinder so as to define a pair of opposed head gaps between the interior surface of the piston cylinder side wall and the piston cylinder head;

(c) a piston slidably disposed within the piston cylinder, the piston having a piston side wall with an exterior surface, the piston being sized and dimensioned to be operatively sealable with the interior surface of the piston cylinder side wall, the piston also having a lower piston portion with a lower piston portion upper surface disposed within the lower piston cylinder portion and an upper piston portion comprising a pair of opposed upright extension members, both having an uppermost portion, each of the pair of opposed upright extension members extending upwardly from the lower piston portion through one of the two opposed head gaps and being extendable upwardly into the upper cylinder portion, the lower piston portion upper surface being adapted to cooperate with the interior surface of the piston cylinder side wall, the upright extension members and the lower surface of the piston cylinder head to define an enclosed lower chamber, the piston being operatively connected to a crank shaft by a piston rod, and adapted to reciprocate within the piston cylinder between an upward cycle and a downward cycle;

(d) a piston top wall disposed transversely within the piston cylinder side wall and attached to each of the uppermost portions of the pair of upright extension members, the piston top wall being disposed to cooperate with the interior surface of the piston cylinder side wall to define an enclosed upper chamber in the upper cylinder portion immediately above the piston top wall, the piston top wall also being adapted to cooperate with the pair of upright extension members, the interior surface of the piston cylinder side wall and the upper surface of the piston cylinder head to define an enclosed intermediate chamber immediately below the piston top wall;

(f) an upper tube valve for alternatively (i) allowing the flow of fluids between the upper chamber and the tube (ii) preventing the flow of fluids between the upper chamber and the tube;

(g) a lower tube valve for alternatively (i) allowing the flow of fluids between the tube and the lower chamber and (ii) preventing the flow of fluids between the tube and the lower chamber;

(h) a first upper chamber intake valve for controlling the flow of fluids to the first intake port defined within the piston cylinder upper portion;

(i) a second upper chamber intake valve for controlling the flow of fluids to the second intake port defined within the piston cylinder upper portion;

(j) means for alternatively allowing the transfer of fluids between the intermediate chamber and the lower chamber and for alternatively preventing the transfer of fluids between the intermediate chamber and the lower chamber; and

(k) an igniter disposed proximate to the lower chamber for igniting fluids within the lower chamber.

3. The apparatus of claim 2, wherein the valve is an inertial valve disposed within the piston top wall and adapted to close on the downward cycle of the piston and to open on the upward cycle of the piston.

4. The apparatus of claim 2, wherein the means for alternatively allowing the transfer of fluids between the intermediate chamber and the lower chamber is a valve.

5. The apparatus of claim 2, wherein the means for alternatively allowing the transfer of fluids between the intermediate chamber and the lower chamber comprises at least one scavenge passage disposed within each of the pair of upright extension members, the scavenge passages being in communication with the intermediate chamber on the upward cycle of the piston and in communication with the intermediate and lower chambers on the downward cycle of the piston.

6. The apparatus of claim 5, wherein each of the pair of upright extension members comprises a plurality of scavenge passages, at least one of the scavenge passages in each of the pair of upright extension members having a top wall and at least one of the scavenge passages in each of the pair of upright extension members not having a top wall.

7. The apparatus of claim 2, further comprising a plurality of spaced apart vertical seal strips mounted in circumferentially-spaced slots in the interior surface of the cylinder wall.

8. The apparatus of claim 7 further comprising springs disposed in the slots to urge the respective vertical seal strips therein radially inward towards the piston.

9. The apparatus of claim 7 wherein the vertical seal strips are slidably disposed within vertical piston slots which are defined in the exterior wall of the piston.

10. The apparatus of claim 2, further comprising a lateral seal strip disposed on each side of the piston cylinder head.

11. The apparatus of claim 2 further comprising a plurality of piston rings disposed in a plurality of spaced apart grooves defined in the exterior surface of the piston, and wherein a plurality of the piston rings have reduced edge portions to enable passage of oil upwardly along the interior surface of the piston wall.

12. A two-stroke cycle engine comprising the apparatus of claim 2.

13. The two-stroke cycle engine of claim 12, wherein the valve is an inertial valve disposed within the piston top wall and adapted to close on the downward cycle of the piston and to open on the upward cycle of the piston.

14. The two-stroke cycle engine of claim 12, wherein the means for alternatively allowing the transfer of fluids between the intermediate chamber and the lower chamber comprises at least one scavenge passage disposed within each of the pair of upright extension members, the scavenge passages being in communication with the intermediate chamber on the upward cycle of the piston and in communication with the intermediate and lower chambers on the downward cycle of the piston.

15. The two-stroke cycle engine of claim 12, wherein each of the pair of upright extension members comprises a plurality of scavenge passages, at least one of the scavenge passages in each of the pair of upright extension members having a top wall and at least one of the scavenge passages in each of the pair of upright extension members not having a top wall.

16. The two-stroke cycle engine of claim 12, further comprising (i) a plurality of spaced apart vertical seal strips mounted in circumferentially-spaced slots in the interior surface of the cylinder wall, and (ii) springs disposed in the slots to urge the respective vertical seal strips therein radially inward towards the piston, the vertical seal strips being slidably disposed within vertical piston slots which are defined in the exterior wall of the piston.

17. The two-stroke cycle engine of claim 12 further comprising (i) a lateral seal strip disposed on each side of the piston head, and (ii) a plurality of piston rings disposed in a plurality of spaced apart grooves defined in the exterior surface of the piston, wherein a plurality of the piston rings have reduced edge portions to enable passage of oil upwardly along the interior surface of the piston wall.

18. A two-stroke cycle engine comprising:

(a) a piston cylinder having a piston cylinder upper portion, a piston cylinder lower portion, a piston cylinder side wall with an interior surface and a piston cylinder top cover, the piston cylinder further having an intake port defined within the piston cylinder upper portion and an exhaust port defined within the piston cylinder lower portion;

(b) an intermediate piston cylinder head fixedly disposed within the piston cylinder so as to separate the piston cylinder upper portion from the piston cylinder lower portion, the piston cylinder head extending transversely across the interior of the piston cylinder and having an upper surface and a lower surface, the piston cylinder head being disposed within the piston cylinder so as to define a pair of opposed head gaps between the interior surface of the piston cylinder side wall and the piston cylinder head;

(c) a piston slidably disposed within the piston cylinder, the piston having a piston side wall with an exterior surface, the piston being sized and dimensioned to be operatively sealable with the interior surface of the piston cylinder side wall, the piston also having a lower piston portion with a lower piston portion upper surface disposed within the lower piston cylinder portion and an upper piston portion comprising a pair of opposed upright extension members, both having an uppermost portion, each of the pair of opposed upright extension members extending upwardly from the lower piston portion through one of the two opposed head gaps and being extendable upwardly into the upper cylinder portion, the lower piston portion upper surface being adapted to cooperate with the interior surface of the piston cylinder side wall, the upright extension members and the lower surface of the piston cylinder head to define an enclosed lower chamber, the piston being operatively connected to a crank shaft by a piston rod, and adapted to reciprocate within the piston cylinder between an upward cycle and a downward cycle;

(d) a piston top wall disposed transversely within the piston cylinder side wall and attached to each of the uppermost portions of the pair of upright extension members, the piston top wall being disposed to cooperate with the interior surface of the piston cylinder side wall to define an enclosed upper chamber in the upper cylinder portion immediately above the piston top wall, the piston top wall also being adapted to cooperate with the pair of upright extension members, the interior surface of the piston cylinder side wall and the upper surface of the piston cylinder head to define an enclosed intermediate chamber immediately below the piston top wall;

(e) a valve for alternatively allowing the transfer of fluids between the upper chamber and the intermediate chamber and for alternatively preventing the transfer of fluids between the upper chamber and the intermediate chamber;

(f) means for alternatively allowing the transfer of fluids between the intermediate chamber and the lower chamber and for alternatively preventing the transfer of fluids between the intermediate chamber and the lower chamber; and

(g) an igniter disposed proximate to the lower chamber for igniting fluids within the lower chamber.

19. A pump comprising:

(a) a piston cylinder having a piston cylinder upper portion, a piston cylinder lower portion, a piston cylinder side wall with an internal surface and a piston cylinder top cover, the piston cylinder further having an upper portion intake port defined within the piston cylinder side wall, an upper portion discharge port defined within the piston cylinder side wall and an exhaust port defined within the piston cylinder lower portion;

(b) an intermediate piston cylinder head fixedly disposed within the piston cylinder so as to separate the piston cylinder upper portion from the piston cylinder lower portion, the piston cylinder head extending transversely across the interior of the piston cylinder and having an upper surface and a lower surface, the piston cylinder head being disposed within the piston cylinder so as to define at least one head gap between the interior surface of the piston cylinder side wall and the piston cylinder head;

(c) a piston slidably disposed within the piston cylinder, the piston having a piston side wall with an exterior surface, the piston being sized and dimensioned to be operatively sealable with the piston cylinder, the piston also having a lower piston portion with a lower piston portion upper surface disposed within the lower piston cylinder portion and an upper piston portion comprising at least one upright extension member, the at least one upright extension member having an uppermost portion, the at least one upright extension member extending upwardly from the lower piston portion through the at least one head gap and being extendable upwardly into the upper cylinder portion, the lower piston portion upper surface being adapted to cooperate with the interior surface of the piston cylinder side wall, the at least one upright extension member and the lower surface of the piston cylinder head to define an enclosed lower chamber, the piston being operatively connected to a crank shaft by a piston rod and adapted to reciprocate within the piston cylinder between an upward cycle and a downward cycle;

(d) a piston top wall disposed transversely to the piston cylinder and attached to the uppermost portion of the at least one upright extension member, the piston top wall being adapted to cooperate with the interior surface of the piston cylinder side wall to define an enclosed upper chamber in the upper cylinder portion immediately above the piston top wall, the piston top wall also being adapted to cooperate with the at least one upright extension member, the interior surface of the piston cylinder side wall and the upper surface of the piston cylinder head to define an enclosed intermediate chamber immediately below the piston top wall;

(e) an upper chamber intake valve for allowing fluids into the upper chamber through the upper portion intake port during the downward cycle of the piston and for preventing fluids from flowing out of the upper chamber through the upper portion intake port during the upward cycle of the piston;

(f) a valve for alternatively allowing the transfer of fluids into the intermediate chamber and for alternatively preventing the transfer of fluids from the intermediate chamber;

(g) means for alternatively allowing the transfer of fluids between the intermediate chamber and the lower chamber and for alternatively preventing the transfer of fluids between the intermediate chamber and the lower chamber;

(h) means for alternatively allowing the transfer of fluids between the intermediate chamber and the lower chamber and for alternatively preventing the transfer of fluids between the intermediate chamber and the lower chamber; and

(i) an igniter disposed proximate to the lower chamber for igniting fluids within the lower chamber.

20. An apparatus useful in a two-stroke cycle engine, the apparatus comprising:

(a) a piston cylinder having a piston cylinder upper portion, a piston cylinder lower portion, a piston cylinder side wall with an interior surface and a piston cylinder top cover, the piston cylinder further having an intake port defined within the piston cylinder upper portion and an exhaust port defined within the piston cylinder lower portion;

(b) an intermediate piston cylinder head fixedly disposed within the piston cylinder so as to separate the piston cylinder upper portion from the piston cylinder lower portion, the piston cylinder head extending transversely across the interior of the piston cylinder and having an upper surface and a lower surface, the piston cylinder head being disposed within the piston cylinder so as to define a pair of opposed head gaps between the interior surface of the piston cylinder side wall and the piston cylinder head;

(c) a piston slidably disposed within the piston cylinder, the piston having a piston side wall with an exterior surface, the piston being sized and dimensioned to be operatively sealable with the interior surface of the piston cylinder side wall, the piston also having a lower piston portion with a lower piston portion upper surface disposed within the lower piston cylinder portion and an upper piston portion comprising a pair of opposed upright extension members, both having an uppermost portion, each of the pair of opposed upright extension members extending upwardly from the lower piston portion through one of the two opposed head gaps and being extendable upwardly into the upper cylinder portion, the lower piston portion upper surface being adapted to cooperate with the interior surface of the piston cylinder side wall, the upright extension members and the lower surface of the piston cylinder head to define an enclosed lower chamber, the piston being operatively connected to a crank shaft by a piston rod, and adapted to reciprocate within the piston cylinder between an upward cycle and a downward cycle;

(d) a piston top wall disposed transversely within the piston cylinder side wall and attached to each of the uppermost portions of the pair of upright extension members, the piston top wall being disposed to cooperate with the interior surface of the piston cylinder side wall to define an enclosed upper chamber in the upper cylinder portion immediately above the piston top wall, the piston top wall also being adapted to cooperate with the pair of upright extension members, the interior surface of the piston cylinder side wall and the upper surface of the piston cylinder head to define an enclosed intermediate chamber immediately below the piston top wall;

(e) an inertial valve for alternatively allowing the transfer of fluids between the upper chamber and the intermediate chamber and for alternatively preventing the transfer of fluids between the upper chamber and the intermediate chamber, the inertial valve being disposed within the piston top wall and adapted to close on the downward cycle of the piston and to open on the upward cycle of the piston;

(f) means for alternatively allowing the transfer of fluids between the intermediate chamber and the lower chamber and for alternatively preventing the transfer of fluids between the intermediate chamber and the lower chamber; and

(g) an igniter disposed proximate to the lower chamber for igniting fluids within the lower chamber.