US2380673A - Valve stem silencer - Google Patents

Description

July 31, 1945. A. PASTORE 2,3804673 VALVE STEM SILENCER Filed Jan. 19, 1944 awe/whoa jdam .Pasfore, v

abrqwws Patented July 31, 1945 UNITED STATES PATENT OFFlCE VALVE STEM SILENCER- Adam Pasture, Bridgeport, Conn.

Application January 19, 1944, Serial No. 518.895 4 Claims. o|.123-9o) This invention relates to exhaust or intake valves for internal combustion engines, and has for the primary object the provision of an improved construction of valve of the above stated character which will minimize the possibility of the valve holding-open or retaining an open position when it should be in a seated position and to reduce to a minimum vibration and noise due to the shock of the valve lifter or its tappet striking the valve for the opening thereof, consequently materially increasing the life of the valve and providing for better engine performance and permits less clearance to be employed between the valve tappet and the stem of the valve for the compensation of valve expansion.

With these and other objects in view as will become more apparent as the description proceeds, the invention consists in certain novel features of construction, combination and arrangement of parts as will be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing. in which Figure 1 is a side elevation illustrating an engine valve constructed in accordance with my invention.

Figure 2 is a fragmentary vertical sectional view through Figure 1 showing the construction of the stem of the valve made in accordance with the present invention.

Referring in detail to the drawing, the numeral I indicates in entirety the valve which consists of the head 6 and stem 1. The stem is of telescopic construction consisting of the sections A and B. The section A is provided with a socket 8 opening outwardly of the lower end of the section A and is partly screw threaded to permit threading ,therein a member 8 forming a part of the section B of the valve stem. The overall length of the member 9 is much less than the depth of the socket I so that a member ill of the section B may be slidably received within the socket 8 as well as the cushioning spring II. The cushioning spring is attached to the members 9 and III, as shown at if. The form of attachment of the spring to said members 9 and Ill may be varied. such as welding or fasteners of some kind passed through openings in the spring I l and threaded into the members 8 and Ill. During all positions of the valve the spring II is confined in the recess I and is protected by the section A of the valve stem while the section B protrudes from the recess to be contacted by the usual tappet of the valve lifter of an ensine.

It is always necessary to compensate for expansion of the valve by heat in an engine by providing a certain amount of clearance between the tappet of the valve lifter and the section B of the stem I. However, when the construction as shown in the drawing is employed less clearance will be necessary to compensate for this expansion of the valve than when the stem of the valve is of a conventional construction or all in one piece due to the fact that when the valve 5 expands from heat and the section B of the stem being engaged by the lifter, the spring I I may compress which will allow the valve head 6 to properly engage its seat when the cam operating the valve lifter is in its lowermost position or the low face of the cam is in contact with the section B of the stem.

Also, it will be noted that when the valve lifter is moved upwardly to unseat the valve, its movement is very sudden and due to the clearance bee tween the tappet and the section B of the stem the tappet will strike said section B with considerable force and the spring ii acts to absorb the shock created by said force thereby prolonging the life of the valve and reducing noise and vibration to a minimum.

While the spring I i is shown of substantially 8 shape, other cushioning springs of different shapes may be employed.

While I have shown' and described the preferred embodiment of my invention, it will be understood that minor changes in construction, combination and arrangement of parts may be made without departing from the spirit and scope of the invention as claimed.

Having thus described my invention, what I claim is: y

1. In a valve for internal combustion engines, a valve head, a stem integral with said head and including telescopic sections and one oi said sections adapted'to be engaged and disengaged by a tappet of a valve lifter, cushioning means arranged between the telescopic sections, and means for adjustably securing said one section and said cushioning means to the other of said sections.

2. In a valve for internal combustion engines, a valve head, a stem integral with said head and including telescopic sections and one of said sections adapted to be engaged and disengaged by a tappet of a valve lifter, a cushion spring engaged by the telescopic sections, and means for adjustably securing said one section and said cushion spring to the other of said sections.

3. In a valve for internal combustion engines, a

' valve head, a stem integral with. said head and 2 I tions adapted to be engaged and disengaged by a tappet of a valve litter, and a cushion spring connecting the telescopic sections and housed by one of said sections at all times.

4. In a valve, a valve head, a stem integral with said head and including a rigid section having a socket opening outwardly through its i'ree end and a second section composed of a pair of members one secured within the socket of the valve stem against movement and the other slidably received in the'socket and protruding therefrom to be ensaged by a tappet of a valve litter, and a substantially a-shaped spring connecting said members and confined within the socket.

ADAM PASTORE.

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