From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Page from a journal discussing magnetic injection valves and a new concealed hinge design for auto bodies.
| Identifier | ExFiles\Box 158\5\ scan0040 | |
| Date | 22th April 1939 | |
| 536 MAGNETIC INJECTION VALVE [Graph 1] NOZZLE OPENING PRESSURE 1500 LB. PER SQ. IN. Y-axis: INJECTION DELAY - DEG. CAM ANGLE (0-7) X-axis (front): FUEL LINE LENGTH - INCHES (50.5, 40.5, 30.5, 17) X-axis (side): FUEL PUMP SPEED - R.P.M. (300, 500, 700, 900) [Graph 2] NOZZLE OPENING PRESSURE 2500 LB./SQ. IN. Y-axis: INJECTION DELAY - DEG. CAM ANGLE (0-8) X-axis (front): FUEL LINE LENGTH - INCHES (50.5, 40.5, 30.5, 17) X-axis (side): FUEL PUMP SPEED - R.P.M. (300, 500, 700, 900) Fig. 14. The in-fluence of fuel line length and fuel pump speed on the in-jection delay with a jerk-pump system. Figs. 14A and 14B show the varia-tion in injection delay for the single-hole nozzle of a jerk-pump system. The influence of the dynamics of the system are evident. Since the delay is a function of the opening pressure of the nozzle it is dependent, besides other factors, upon the compressibil-ity of the fuel. Thus fuel tempera-ture, pressure, and viscosity play an important role.² These results further show the difficulties which may be encountered in engines on which various lengths of fuel lines are used for different cylinders. In brief, the possibilities of governing the jerk-pump system to control in-jection delay are not as simple as with the magnetically actuated spray valve in conjunction with the com-mon-rail system. Summary The magnetically actuated spray valve offers a means of accurately controlling the quantity of fuel in-jected per cycle. It will accurately meter smaller quantities than is pos-sible with any mechanical system. Successive sprays are reproducible, which is a large factor in smooth engine operation. Control of the character of the spray by simple changes in the electrical circuit has great possibilities. Governing of injection delay offers no complex problems, since the sys-tem is independent of the dynamics of the pump and the fuel column. Acknowledgments The authors are indebted to the W.P.A. (Project 8850) for assistance in collecting the data; to Lieutenants C. S. Seabring and J.{Mr Johnson W.M.} R.{Sir Henry Royce} Pierce, U. S. N., who, as graduate students at the University of California, ob-tained the data on injection delay with the jerk-pump system; to J.{Mr Johnson W.M.} E.{Mr Elliott - Chief Engineer} Gullberg of the Department of Zool-ogy, who assisted in photographing the spray, and to the Atlas Imperial Diesel Engine Co. for the equipment tested. ² Compressibility and Velocity of Pressure Waves in Petroleum Oils. Robert Matte-son. Journal of Applied Physics, Vol. 9, No. 1. January, 1938. New Type of Concealed Hinge THE Metal Specialty Co., Cincin-nati, Ohio, through its hinge division sales office, 409 Stephenson Bldg., Detroit, is demonstrating a new type of concealed hinge for auto bodies. As illustrated, the hinge is a simple element of heavy-gage steel, consisting of two leaves and a pin. It is located within the body pillar, where it is protected from the weather and easy to keep lubricated. Its location at the widest section of the body permits a wide latitude of body design so far as “tumble-in” or “turn-under” are concerned. A feature of the design is that the door can be made to swing either paral-lel to the ground, or with a minimum of lift even with an extreme tumble-in angle. Production is said to be facili-tated by the fact that the single hinge pin assures pin alignment and permits rapid hanging of doors on the assembly line. Door fitting is simplified by the bending adjust-ment inherent in the hinge. Other advantages claimed for the device are that the door check is made in combination with the hinge, and that its location is such as not to interfere with the glass run. [Image caption left] Design of Metal Specialty Co.'s concealed hinge [Image caption right] Side view of con-cealed hinge with door open April 22, 1939 Automotive Industries | ||