Development of New Cam-Shower for Oil Flow Optimization
- Technical Paper
- ISSN 0148-7191
- DOI: https://doi.org/10.4271/2014-01-2851
Published October 13, 2014 by SAE International in United States
On internal combustion engines, the intake and exhaust valves are reciprocated by the cam mechanism. ‘Cam-shower’ is oil supplying device for each cam of a camshaft.
The conventional cam-shower is simple pipe shape with several same size outlets for each cam. Oil from cylinder head is supplied in the middle point of cam-shower pipe. The oil flow of outlets near the oil supplied point is large amount, and outlet far from supplied point is small. The distribution of oil flow from each outlet is uneven.
A new structure of cam-shower has been developed, and it has two important features. First, it has branched oil passage like cereoid cactus. Second, supplied oil flow from cylinder head to a cam-shower is intermittent by using throughhole passage in a camshaft journal.
The new developed cam-shower properly distributes oil flow to each cam evenly and reduces wasted oil flow, so that total amount of oil flow of the cam-shower can be remarkably reduced by 90%. Then small discharge rate of the oil pump for engine can be set up and its driving torque gets lower. Eventually, that achieves low fuel consumption of engine.
CitationHikita, Y., Kawahara, M., and Noguchi, N., "Development of New Cam-Shower for Oil Flow Optimization," SAE Technical Paper 2014-01-2851, 2014, https://doi.org/10.4271/2014-01-2851.
- Nakase, T., Saito, T., Kato, N., Kohama, T., and Masuda, Y., “The Oil Flow Measuring Method in Engine Lubrication,” JSAE Paper 9839056, 1998, 89-98, 5-8.
- Nemoto, S., Kawata, K., Kuribayashi, T., Akiyama, K., Kawai, H., and Murakawa, H., “A study of engine oil aeration,” JSAE Review 18, 1997, 271-276.
- Suzuki, S., Noda, T., Ozasa, T., and Kikuchi, T., “Visualization and Measurement of Oil Flow in Oil Supply Passages in a Transparent Crankshaft,” Transactions of Society of Automotive Engneers of Japan, 2004, 35, 4, 113-118.
- Watanabe, K., Kawai, K., Sasaki, S., and Tomita, A., “A study of the bearing oil flow and the bearing temperature in engine -Part 2 : The measurement of the oil flow balance; The influence of the oil groove, bearing width -,” JSAE Paper 9732612, 1997, 972, 185-188.
- Shimura, T., Kikuchi, T., Hikita, Y., and Yamazaki, M., “Reducing the Amount of Lubricating Engine Oil by Using a New Crankshaft Bearing with Eccentric Oil Groove,” SAE Technical Paper 2004-01-3048, 2004, doi:10.4271/2004-01-3048.
- Ozasa, T., Katagiri, T., and Ashihara, K., “Lubrication Analysis of Engine Bearings,” Journal of Japanese Society of Tribologists, 2010, 55, 6, 361-368.
- Staley, D., Pryor, B., and Gilgenbach, K., “Adaptation of a Variable Displacement Vane Pump to Engine Lube Oil Applications,” SAE Technical Paper 2007-01-1567, 2007, doi:10.4271/2007-01-1567.
- Milani, M., Paltrinieri, F., Tosetti, F., Bianchini, A. et al., “Design and Optimization of a Variable Displacement Vane Pump for High Performance IC Engine Lubrication: Part 2 - Lumped Parameters Numerical Analysis,” SAE Technical Paper 2009-01-1064, 2009, doi:10.4271/2009-01-1064.