US1997133A - Valve for internal combustion engines - Google Patents

Description

A ril 9, 1935. R. c. cRoss VALVE FOR INTERNAL COMBUSTION ENGINES Filed Dec. 20, 1935 Ema/v0 C. c/eoss Patented Apr.9,1935 1 997 133 UNITED STATES PAT NT-pm:

VALVE FOR INTERNAL COMBUSTION ENGINES Roland Claude Cross, Odd Down, Bath, Somerset,

' y England f Application December 20, 1933, Serial No. 703,299 In Great Britain December 23, 1932 V Claims. (01.123490) v H r I This invention relates to improvements in ro- Figuresl l and 5 are port diagrams hereinafter taryvalves, such as rotary valves for internal described. V combustion engines, and is a modification o'f'the Referring] to the drawing there is provided: a' invention set forth in the specification of my thin bearing liner or bush l, which is shrunk-or 5 prior Patent'No. 1,887,997 dated'November 15th, otherwise fastened in the valve'housing 2;and 5 1932. The said prior case refers to valve assemiii which the valve 3 rotates to performits' work; blies-for internal combustion and other engines of opening and closing theport 4 in'thefvalve wherein a valve element rotates within a bearing housing leading to-thecylinder head f5. f This surface and by means of exhaust and inlet ports ner i has a P Opening 5 in its Wall therein is used to control the opening and closently Communicating With the P 4, and the 10 ing of a port or ports in the bearing element; an said liner, at that part of it which forms the essential feature in the construction of my said p p y 0f e Sa p Opening is Shaped With prior invention is a bearing liner which is fixed a lip 8 so as to press slightly inwards towards the g in or to the valve housing and has a port'or working face of the valve 3, so that the edge of ports formed or surrounded at the surfaceof said the said port opening is resiliently pressed 15 liner with which the valve coacts by a. resilient against the wall of the valve. This gives the lip pressed up from said liner and having an unvalve a good working clearance in the liner, and' broken or continuous edge. This lip tends to whatever position the valve assumes in the liner project into the space occupied by the valve and the said lip 8 will resiliently follow the surface of is normally pressed back by the valve to form a the valve, thereby making it sufficiently gas-tight fluid-tight seal. for all practical purposes.

The object of the present invention is to keep The clearance between the valve .3 and the the temperature of the resilient lip as low as posliner iS necessarily greatly exaggerated in sible, and this is accomplished by shielding it to drawing to show the deflected lip 8, but in pracsome extent from the exhaust flame whilst altice the lip is pressed substantially back to the 5-.

lowing it to project into the path of the cooling plane of the working surface of the liner when inlet gases as much as possible. in the assembled position. 7 7

According to the present invention the edge of The valve 3 is formed with an inlet port! the said resilient lip is mainly covered by the edge and an exhaust port 9 which, in turn, during the of the exhaust port in the valve when they regisrotation of the valve, come into register with the 30 ter. For example, the exhaust port in the valve lipped port 6 in the liner I. As seen in Figures is made of smaller area than the port in the l and 2 the exhaust port 9 is of smaller area liner, whilst preferably also the inlet port in the than the lipped port 6 f e liner s that the valve is made larger. The eifect aimed at is to edge of p 9 overlaps the resilient p C011- cause the edge of the valve port to align with or versely the inlet port It! is of greater. area than overlap the lip edge, or a substantial length the lipp port 5 S0 i this case the p 3 thereof during exhaust, whilst the edge of the is the overlapping e When Ports 6 d W other valve port is disposed back away from the in register as in Figure p lip edgeregarding their position of operation or In the embodiment according to u s 40 register-to allow the latter (for all or most of V ports are Shown as either Circular r 40 its length) to project into the inlet valve port elliptical- T may be Of 9 area during the suction stroke If the various ports are of square or other polygo- The invention will be better understood by ref formation then all the Sideedges or m erence to the accompanying drawing,'whereini of may be set to produce h aimed Figure 1 is a vertical section of the upper part Flgures 4 and stare Show dlagrams of rec-e of an internal combustion engine fitted with a tailgular P t vexmusti port of t vaive rotary valve controlling the inlet and exhaust of bemg. depleted m coqperatw? reglstmtmpwlth the cylinder according to the invention; f i 5 port a anq'oveflappmg m Figure Figure 2 is a fragmentary view to a larger W ports is Shown overlapgmgfhe Inlet port ID in Figure 5. The overlapping is shown scale according to FIUIJLYB 1 showing the exhaust L l v as taking effect at every side of the ports. the valve m Its P05113911 of register With circular or elliptic ports as in Figures 1-3, opelfa'tlon; D the edges of the ports in the liner and valve re; Figure 3 1s a view similar to Figure 2 but showspectively may be parallel or concentric when in mg the inlet port in operation; the coincident or registering position. The 551 amount of overlap of the resilient lip 8 into the valve port area or vice versa need not necessarily be symmetrical all round the perimeter of the port.

valve and the housing and having a port perma-V nently communicating with the housing port,

and a resilient lip integral with the bearing element surrounding the port therein, and tending to project into the space occupied by the valve whereby it seals fluid-tight against the valve, the edge of the said lip being mainly covered bythe edge of the said exhaust port in the valve when they register. v

2. A valve assembly as set forth inelaim :1 in which the edge of the resilient lip forms 'a port area greater than that of the exhaustport in the valve. 7 v f 3. A'valve assembly as set forth in claiml in which the valve has an exhaust port and an'inlet port for cooperation with the'housing port,

and in 'which the edge of the resilient lip is mainly uncovered by the edge of the said inlet port in the valve when they register. ;1

5. A valve assembly'comprising a valve housing having a p0rt,ar cylindrical valve bearing element disposed within said housing and having a port permanently communicating with the housing port, a cylindrical valve within said bearing element provided with exhaust and inlet ports" for cooperating with the housing and bearing element ports, and a resilient lip integral with said bearing element, surrounding the port therein, and tending to project at its free edge into the interior of the bearing element whereby ROLAND :CLAUDE cRoss.

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