Patent GB-734657-A (GB)
Title: Improvements in or relating to an air intake arrangement associated with the combustion chamber of an induction air swirl internal combustion engine
IPC: F02B31/04
Filed: 1953-10-02
Abstract: 734,657. Arrangement and cooling of intake valves and passages. TEXACO DEVELOPMENT CORPORATION. Oct. 2, 1953 [Oct. 16, 1952]. No. 27062/53. Classes 7(2), 7(3) and 7(6). Intake passage. In an air intake arrangement associated with the combustion chamber 30 of an induction air swirl engine comprising a tubular air intake passage 16 having an intermediate portion 22 of a cross-section decreasing progressively in area in the direction of air flow while changing progressively in shape from circular to an ellipse of increasing flatness having its major axis in a plane perpendicular to the swirl axis 42, the intermediate portion of the passage has a substantially straight flow axis 40 disposed at an acute angle 26 to the swirl axis 42 and contained within a plane parallel to the latter and tangentially to the circular path of the air swirl, a poppet valve 62 may also be associated with the outlet portion 34 of the passage 16. The circular inlet end 20 is joined to the intermediate portion 22 by a curved elbow 32: the section of the outlet portion 34 is slightly oval where it joins the portion 22 but changes progressively to a flatter oval before fairing at its outlet end 36 into a circular orifice 38. The axis 40 is common to both portions 22 and 34 and the angle 26 has a value of 35‹-45‹. The passage is cooled by water in spaces 44 and 46. Intake valve and seat. Adjacent the junction of portions 22 and 34 and directly opposite the disc-shaped combustion chamber 30 the port has a counterbore 50 therein for the valve guide 52, which is made without the conventional boss and is cut back, as shown, or ground flush with the passage wall, the portion 34 is chamfered to form a tapered valve seat 56 and is also provided with a counterbore 58, which permits of a complete 360‹ rotation of the valve to facilitate lapping of the valve and seat. The part of the valve stem 60 within the port has a diameter which is between 0.2-0.25 of the diameter of the intake valve 62, the joint of the stem and valve being filleted 64 ; the radius of the latter is slightly less than the valve-stem diameter. The valve 62 is parallel to the top 28 of the chamber 30 and has a champered part 66 to co-operate with the seat 56 whilst the upper side 68 of the valve is preferably conical with a base angle 70 of 5‹-12‹. On the side 68 is a concentrically disposed shroud 72 having a semiannular port 74 with its sides perpendicular to the valve plane and supported from the valve by a semi-frusto-conical portion 76 ; the shroud extends for 150‹-180‹ about the valve. The valve is normally positioned to place the ends of the shroud 72 on a line that is perpendicular to the vertical plane of the air-flow axis, the shroud height being equal to the maximum valve lift. The passage, valve seat and valve comprise a converging nozzle which impart high velocity and a fixed direction to the incoming air with the minimum of turbulence and friction loss. Specifications 596,846 and 723,711 are referred to.