Search Results

As the size and weight ofrack and pinion power steering system are being reduced to meet CAFE requirements, the hydraulic fluid pressure in the system is expected to rise. Therefore, the authors carried out high pressure durability tests on rack seals and evaluated their characteristic values, together with the FEM stress analysis and the evaluation of high temperature resistance of rubber materials. Consequently, a new rack seal for power steering, durable even under such a high pressure as 15.7MPa, is developed by modifying designs of the backup ring and metal case and changing the rubber material.

This paper is to report how a new cylinder seal for rack and pinion type power steering has been developed by changing oil seal production process and geometry of the seal which provides complete sealing of high pressure hydraulic fluid with low frictional force maintaining long sealing service life. This paper includes its seal characteristics. Along with the current demand on quietness with in the vehicles, the authors could experimentally evaluate unpleasant noises from cylinder seals under resonance effects with the car body by using f-G property. Its procedure will be described here.