US1557548A

US1557548A - Valve-operating mechanism

Info

Publication number: US1557548A
Application number: US374996A
Authority: US
Inventors: Dorsey F Asbury
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-04-19
Filing date: 1920-04-19
Publication date: 1925-10-20
Anticipated expiration: 1942-10-20

Description

Patented Qct. 20, 1925.

UNITED STATES DORSEYF. ASBRY, OF WASHINGTON, DISTRICT OF COLUMBIA.

- vALVEoPERATING MncHANIsi/r.

Application led April 19, 1920. Serial No. 374,996.I

To @Zlio/710m# may con-ocra.'

Be it known that I, Doasnr F. Assurer, a citizen of the United States, residing at 'Vashington, in the District of Columbia, have invented certain new and useful Improvements in Valve-Operating Mechanism, of which the following is a specification.

My invention rela-tes to improvements over the construction of rocker] arms for valve operating mechanisms as described and claimed in my copending` application, filed F eb. 21, 1920, serially numbered 860,487, whereby friction and consequently wear and the necessity for lubrication of the points of contact between a rocker arm and the parts of the mechanism `with which it is operatively associated is eliminated.

The accompanying drawings are illustrative of the preferred embodiment of my improved rocker arm construction.

In the drawings- Fig. 1 is a. vertical section through a por-- tion of an internal combustion engine showing the application of my invention thereto; and

Fig. 2, is a Sectio-n on the line 2-2 of Fig. 1.

Referring to the drawings in det-ail, A designates, generally, a portion of an internal combustion engine including a cylinder 10 and cylinder head 11. Seating on the head 11 is a puppet valve 12, the stem 13 of which extends through and above the head 11 and has associated therewith a spring 111 normally holding the valve to its seat. Disposed in operative relation to the valve is a tappet rod 15, and bridging the upper ends vof said valve stem and said tappet rod is a rocker arm 16, fulcrumed intermediately whereby desired operation of the valve is accomplished upon actuation of the tappet rod, the latter being operated in any well known or preferred manner as by cam means not shown.

My invention consists in the provision of improved means whereby an anti-frictionyal fulcrum. is provided fon said rocker arm and an anti-frictional Contact is provided between the rocker arm and the valve stem and tappet rod respectively, whereby noise, wear and the necessity for lubricating these relatively contacting parts is eliminated. The preferred arrangement for accomplishin'g these purposes is illustrated in the accompanying drawings and consists in prowith respect to one face ofthe rocker arm in order that the valve stem and tappetrod may project into/them a sutlicient distance to enable the walls surrounding them to prevent excessive lateral displacement of `the valve stem and tappet rod with respect to the rockerl arm. Smaller openings 19 and 20 respectively are provided in lthe rocker arm at right'a-ngles to the first mentioned open-' ings, and said latter openings respectively intersect the first mentioned openings at points somewhat remote fromv theI face of the rocker arm through whichthe valve stem and tappet rod project. "Hardened vpins v21 ably as illustrated by spinning the relatively soft metal of the rocker arm around the ends of the pins. By this arrangement the portion of the pins extending transversely across the

openings

17 and 18 provides a hardened curved surface for contact with the upper flat ends of the valve stem and tappet rod. If desired, members 23 and 24: having hardened fiat surfaces for contact with saidpins may be provided o-n the upper ends of the tappet rod and valve stem respectively, although such members are not essential to an efficient operation of the rocker arm.

At an intermediate point in the face of the rocker arm opposite to the face first referred to, that is, the upper face in the present disclosure, I provide an opening 25 similar to either of the

openings

17 or 18 and associate therewith a pin 26 in a manner similar to the association of the pins aforementioned with the first openings. Likewise, in a bracket 27 secured to the cylinder head I provide an opening 28 and an intersecting pin 29, and between the pins 26 and 29 with its flat ends in contact with said pins and portions of its body projecting into the openings 25 and 28 I interpose a member 30 providing a iiexible fulcrum for the rocker arm.

From the foregoing it is believed that the operation and advantages of my invention will be clearly understood, it being apparent that upon actuation of the tappet rod ka rolling action will occur between the v and22 are fixed 1in thefopenings19 `and 20 "respectively in any desired manner," preferdrical pin fitted within one of said openings Vwhereby a side portion thereof provides within the other opening a convex bearing surface having parallel elements.

2. In a valve 'mechanism, a rocier arm provided with a pair of openings intersecting one another at right angles, and a cylindrical pin fitted within one of said openings whereby a side portion thereof provides within the other opening a convex bearing surface having parallel elements, the azie of said Vopenings and pin being at right angles to the longitudinal anis of the rocher arm. f

3. In a valve mechanism, a rocker arm provided with a pair of openings located adjacent to its ends, respectively, and forming guides for the ends of a valve stem and push rod, respectively, said rocker arm further being provided With a'third openingl located intermediately thereof and forming a guide for a fulcrum member, said rocker arm further having other openings interseating said first mentioned openings at right angles, respectively, and a hardened cylindrical pin fitted in each of said last mentioned openings and forming within veach of the first mentioned openings a conveX bearing surface having parallel elements with which said valve stem, push rod and fulcrum member, respectively, are adapted to have rolling contact.

Ll. In a valve mechanism, a member provided with a pair of openings intersecting one another at right angles, and a cylindrical pin fitted within one of said openings whereby a side portion thereof provides within the other' opening a convex bearing surface having parallel elements, said second mentioned opening being of limited depth and terminating substantially where it intersects the pin receiving opening whereby the pin is supported throughout'its length vat the side thereof opposite lsaid first mentioned opening by the material of the member.

In testimony whereof I hereunto' affix my signature.

DORSEY F. AsBUnY.