U.S. patent number 3,893,483 [Application Number 05/430,904] was granted by the patent office on 1975-07-08 for rotary valve train.
Invention is credited to Timothy Ackerman.
United States Patent |
3,893,483 |
Ackerman |
July 8, 1975 |
Rotary valve train
Abstract
A rotary valve train employing an elongated block with an axial
bore and a shaft disposed in the bore and rotatable about its axis.
The block contains a plurality of longitudinally spaced recesses
centered on the bore and extending at right angles. Each recess has
a first half defining a semicircle and a second half defining a
rectangle. A separate circular disc centered on, secured to and
rotatable with the shaft is disposed in each recess. Each disc has
a quadrant removed. Each recess is ported. Each second half recess
has a centrally disposed arm extending radially toward the shaft
and disposed in sealing engagement with the outer periphery of the
body of the disc.
Inventors: |
Ackerman; Timothy (Centerbrook,
CT) |
Family
ID: |
23709569 |
Appl.
No.: |
05/430,904 |
Filed: |
January 4, 1974 |
Current U.S.
Class: |
137/625.21;
123/190.2; 123/190.17 |
Current CPC
Class: |
F01L
7/06 (20130101); Y10T 137/86638 (20150401) |
Current International
Class: |
F01L
7/00 (20060101); F01L 7/06 (20060101); F01l
007/00 () |
Field of
Search: |
;123/19R,19A,19D,19E
;137/625.21,625.22,625.23 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Myhre; Charles J.
Assistant Examiner: O'Connor; Daniel J.
Claims
Having thus described this invention, what is asserted as new
is:
1. A rotary valve train comprising:
an elongated block having an axial bore and a plurality of
longitudinally spaced recesses centered on the bore and extending
outward at right angles, each recess being ported and having first
and second halves, the first half being semi-circular, the second
half being rectangular;
an elongated shaft rotatable about its axis disposed in the bore;
and
a like plurality of circular discs, each centered on and secured to
the shaft and rotated therewith, the discs being longitudinally
spaced, each disc being disposed in a corresponding recess and
rotatable therein, each disc having a cut out portion defining a
circular sector.
2. The train of claim 1 wherein the disc cut-out portions are
angularly separated one from another.
3. The train of claim 2 wherein each cut-out portion defines a
quadrant.
4. The train of claim 3 wherein each second half has an arm
extending centrally and radially inward, the outer circular
periphery of the corresponding disc being in sealing engagement
with the arm.
Description
SUMMARY OF THE INVENTION
This invention is directed toward a rotary valve train which can be
substituted for a conventional overhead valve train in an internal
combustion engine.
The rotary valve train employs an elongated block with an axial
bore and a shaft disposed in the bore and rotatable about its axis.
The block contains a plurality of longitudinally spaced recesses
centered on the bore and extending at right angles thereto. Each
recess, which is ported, has a first half section defining a
semicircle and a second half section defining a rectangle. A
separate circular disc having a quadrant removed is centered on,
secured to and rotatable with the shaft and is rotatably disposed
in the corresponding recess.
Each combination of recess and disc constitutes a valve. The timing
is controlled by carefully spacing the missing quadrants of the
discs relative to each other. The shaft is driven by a chain off
the crank shaft as is a cam shaft in a conventional engine.
The rotary valve train thus substitutes a smooth circular motion
which is highly efficient for the lower efficiency conventional up
and down motion and contains many fewer parts.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 is a perspective view of shaft with discs as used in the
invention;
FIG. 2 is a perspective view of a portion of the valve block as
used in the invention;
FIG. 3 is an exploded view in cross section of the parts used in
the invention; and
FIG. 4 is a top view of the composite valve train.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Referring now to FIGS. 1-4, mating rectangular blocks 10 and 12
define an elongated block with a centrally disposed axial bore 14.
A shaft 16 rotated about its axis by a chain off the crank shaft of
the engine employing the invention is disposed in the bore.
A plurality of recesses which are longitudinally spaced are
disposed in the block, centered on the shaft and extend at right
angles to the shaft. Each recess has a first half section 18
defining a semicircle and a second half section 20 defining a
rectangle. The center of the section has a stub or arm 22 extending
radially inward at right angles toward the shaft.
The shaft carries a plurality of longitudinally spaced circular
discs 24 centered on the shaft, secured thereto and rotatable
therewith. Each disc has a quadrant 26 cut away. A separate disc is
disposed in each recess and the circular peripheral surface engages
the arm 22. Each section 20 has a port 28.
Each combination of recess and disc constitutes a separate valve
32. Two valves, an intake valve and an exhaust valve are disposed
in corresponding cylinder housings 34, each containing cylinder 36.
The valves are operated by shaft 16 as described. The timing is
adjusted by varying the position of the quadrants 26. As shown in
FIG. 1, the relative positions of the quadrants of a pair of
valves, one intake, the other exhaust, are adjusted for a
180.degree. separation. As is shown in FIG. 3, the two blocks are
placed together, surrounding the shaft and the discs thereon. The
two blocks are disposed directly above the cylinder, forming a
cylinder head. Considering the disc shown in the drawing as an
intake valve, air-fuel mixture is sucked into port 28 into the
rectangular half section only so long as one of the faces of the
cutaway quadrant is between the arm 22 on the rectangular half
section and a downwardly directed vertical line. The corresponding
exhaust valve operates in a similar manner.
While I have described my invention with particular reference to
the drawings, such is not to be considered as limiting its actual
scope.
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