US 1177428 A
Description (OCR text may contain errors)
W. A. MELIN, INTERNAL COMBUSTION ENGINE.
,APPLICATION FILED FEB. 20,1915.
Patented Mar. 28, 1916,
UNITED STATES" PATENT OFFICE.
WALTER A. MELIN, or'mnn LAKE, WISGONSIN.
To all whom it may concern.
Be it known that I, WALTER A. MELIN, a citizen of the United States, residing at Trade Lake, in the county of Burnett and State of Wisconsin, have invented certain new and useful Improvements in Internal- Gombustion Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.
This invention relates to internal combustion engines, and more particularly to a valve operating mechanism for engines of the four-cycle type in which the crank shaft has two rotations to each operation of the exhaust and intake valves.
The invention has for its object to provide a novel and efiicient cam disk keyed directly upon the crank shaft of the engine and so constructed as .to operate or lift the valve or push rod once to each two revolutions of the crank shaft, thus eliminating the usual intermediate cam shaft and gears,
chains and the like connecting the intermediate cam shaft with the crank shaft.
With this and other objects in view, the invention consists in the novel construction, arrangement and formation of parts as will be hereinafter specifically described, claimed and illustrated in the accompanying drawing, in which:
Figure 1 represents a fragmental side elevation of an internal combustion engine, showing the crank shaft in section and the improved valve actuating mechanism connected therewith. Fig. 2 represents a fragmental sectional view through the engine illustrating the valve operating mechanism on an enlarged scale, Figs 3 and t represent side elevations of the cam disks removed, and Fig. 5 represents an enlarged detail sectional view on the line 55 of Fig. 2, showing the cam disk removed.
Referring to the drawing in detail, wherein similar reference numerals designate corresponding parts throughout the several views, the numeral 5 indicates generally an internal combustion engine of the preferred type which includes a crank shaft 6 and a valve It will be understood that the engine is provided with both intake and exhaust valves, but for purposes of illustration only one valve is here shown. A rod 8 is secured to and projects downwardly from the valve 7 and terminates 1n spaced Specification of Letters Patent.
relation to the crank shaft 6. A pair of guides 9 are secured to the cylinder or other part of the engine5 and are formed with openings 10 elongated on lines disposed parallel with the longitudinal axis of the crank shaft 6 for the reception of the valve or push rod 8. The valve is normallyretamed in closed position by the tension of a spring 11 coiled about the rod 8 and engaged at one end with one of the guides or brackets 9 and at the opposite end with a stop pin 12 secured diametrically through the rod 8.
A cam disk designated generally by the numeral 14 is keyed upon the crank shaft 6 directly below the valve or push rod 8. The cam disk 14 is formed with a cam surface 15 of substantially one-half the width of the disk. Two peripheral grooves 16 are formed in the cam disk 14. and are merged or crossed at 17 at a point diametrically opposite the cam surface 15. Throughout the greater portions, the grooves 16 are parallel in planes perpendicular to the axis of the disk.
Patented Mar. 28, 1916. Application filed February 20, 1915. Serial No. 9,645.
A shoe 18 having an enlarged recessed medial portion providing a socket rotatably receiving the lower end of the valve or push rod 8 is slidably received within the grooves 16, the opposite ends of the shoe being tapered, as indicated at 19.
'In operation, rotational movement of the shaft 6 and cam 14 imparts a lateral and longitudinal movement to the valve or push groove 16 and at the next revolution of the crank shaft and cam disk in the other rod 8, the shoe 18 engaging first in one with the cam disk by the tension of the spring 11, and at alternate revolutions of the crank shaft and cam disk the cam surface 15 engages the shoe 18 and'lifts the latter together with the push or valve rod 8, thus opening the valve 7 If desired, the
rod 8 may be formed in sections connected by a universal or other suitable type of joint, thereby permitting the upper portion of the rod to be secured against lateral movement and permitting the necessary lateral swinging movement of the lower part.
What I claim is:
In an internal combustion engine, a crank shaft, a cylinder, guides carried by said cylinder having openings therein elongated on a line extending parallel with crossed or merged at a point diametrically the axis of said crankshaft, a valve rod opposite said cam surface and receiving movable laterally and longitudinally in said said shoe, and means normally retaining; 1 0 guides, a shoe rotatably secured to one end] said shoe in engagement with said grooves.
5 of said valve "rod, a cam disk ke ed on said In testimony whereof I aflix my sigma-v shaft, a cam surface on said dis said disk ,ture. and cam surface having peripheral grooves WALTER A. MELIN.