Valve actuating arrangement for internal combustion engines

Claim 2

A valve actuating arrangement for an internal combustion engine having plural parallel-operating poppet valves associated with a combustion chamber thereof, wherein said valves are actuable by a common cam via a common tappet which is tubular, having a transverse wall at one end and being open at its opposite end so as to terminate in a rim, the transverse wall being cooperable with the cam, and the rim being cooperable with the valves, the tappet being guided and mounted for sliding reciprocating movement, with respect to a mounting member by the portion of the tappet interconnecting the transverse wall and the rim.

Claim 3

An arrangement as claimed in claim 1, wherein the tappet is cylindrical and the mounting member has a circular tappet-receiving passage therein, the internal surface of the passage slidably cooperating with the external surface of the tappet, and the longitudinal axis of the tappet being generally symmetrically disposed with respect to the longitudinal axes of the valves.

Claim 4

An arrangement as claimed in claim 2, wherein the tappet is directly interposed between, and cooperable with, the cam of an overhead cam shaft and a pair of parallel-operating overhead valves, the tappet diameter approximating the inter-axial spacing of the valves, the wall thickness of the rim extending the wall thickness of the tubular body portion of the tappet interconnecting the transverse wall and the rim.

Claim 5

A cylinder head for an internal combustion engine, said cylinder head having at least one combustion chamber, a pair of parallel-operating poppet valves operatively associated with said combustion chamber, and having substantially parallel longitudinal axes, a cylindrical, tubular tappet, common to both said valves, means cooperating with the external cylindrical surface of the tappet to mount said tappet for sliding reciprocating movement relative to said head in a direction substantially parallel to the longitudinal axes of the valves, with the longitudinal axis of the tappet substantially parallel to, and equi-spaced from, both valve axes, said tappet having a lower open end which defines an annular valve-engaging rim, of a diameter approximating the inter-axial spacing of the valve axes, and an upper end closed by a transverse wall cooperating with valve operating means.

Claim 6

A cylinder head for an internal combustion engine, said cylinder head having at least one combustion chamber, a pair of parallel-operating poppet valves operatively associated with said combustion chamber, and having substantially parallel longitudinal axes, a cylindrical, tubular tappet, common to both said valves, means cooperating with the external cylindrical surface of the tappet to mount said tappet for sliding reciprocating movement relative to said head in a direction substantially parallel to the longitudinal axes of the valves, with the longitudinal axis of the tappet substantially parallel to, and equi-spaced from, both valve axes, said tappet having a lower open end which defines an annular valve-engaging rim, of a diameter approximating the inter-axial spacing of the valve axes, and an upper end closed by a transverse wall cooperating with valve operating means.

Claim 7

A cylinder head as claimed in claim 4, including a valve clearance-adjusting spacer interposed between each valve stem and said rim, and interchangably secured to the valve stem.

Claim 8

A valve actuating arrangement for an internal combustion engine having plural parallel-operating poppet valves associated with the combustion chamber thereof, said valves being actuable by a common cam via a common tappet, said tappet including a cross-member extending in a direction generally transverse to the longitudinal axes of the valves and a longitudinal member connected to the cross-member and having portions disposed generally coincident with extensions of the valve axes, the cross-member being cooperable with the cam, and the ends of the generally coincident portions of the longitudinal member remote from the cross-member being cooperable with the valves, the longitudinal member and a mounting member being provided with cooperating bearing surfaces by means of which the longitudinal member is mounted for sliding the movement relative tO the mounting member, the plane of the cooperating bearing surfaces being approximately coincident with extensions of the valve axes.

Claim 9

A valve actuating arrangement for an internal combustion engine having plural parallel-operating poppet valves associated with the combustion chamber thereof, said valves being actuable by a common cam via a common tappet, said tappet including a cross-member extending in a direction generally transverse to the longitudinal axes of the valves and a longitudinal member connected to the cross-member and having portions disposed generally coincident with extensions of the valve axes, the cross-member being cooperable with the cam, and the ends of the generally coincident portions of the longitudinal member remote from the cross-member being cooperable with the valves, the longitudinal member and a mounting member being provided with cooperating bearing surfaces by means of which the longitudinal member is mounted for sliding the movement relative tO the mounting member, the plane of the cooperating bearing surfaces being approximately coincident with extensions of the valve axes.