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Research of Hydrostatic CVT for Passenger Vehicles

Article of Honda R&D Technical Review Vol.14 No.1

Summary

Hydraulic Continuously Variable Transmissions (“CVT”) have a large capacity for power transmission and have achieved proven results in industrial machines. Research was conducted on hydraulic CVT for use in passenger cars with large engine displacement, particularly in the areas of fuel economy performance, high-speed performance and quietness where passenger cars have higher demands compared to industrial machines. An HMT (Hydro Mechanical Transmission), which has the highest efficiency of all hydraulic CVT, was adopted to improve efficiency at cruising which greatly affects fuel economy when cruising at high speeds. In addition, the lock-up brake mechanism and the hydraulic pump and motor portions were improved to reduce agitation, resulting in a 6% improvement in efficiency when cruising at 50 mph. The hydraulic motor rotates at high speed during high-speed cruising, but centrifugal force has little effect and prospects for durability were obtained by adopting a bowl type slipper and improving the cooling method. A method for reducing noise was also derived by focusing on fluctuations of swash plate movement, which are correlated with noise.

Reference

(1) Nishimura, S., et al.: “An Oil-Based Continuously Variable Transmission for Small Lawn Mowers”, HONDA Technical Review, Vol. 2, pp. 67–77 (1990)
(2) Saito, M.: “Introduction of PGM-HMT System for ATV”, Autumn Seminar 2001, Japan Fluid Power System Society, pp. 43–50 (2001)
(3) Ishihara, S.: PISTON PUMPS AND MOTORS Theory & Practice, Tokyo, OHM, pp. 127–133 (1979)
(4) Yamauchi, K., Yamamoto, T.: “The Noise of Hydraulic Pump and a Method for Reducing the Noise Level”, Mitsubishi Heavy Industries Technical Review, Vol. 12, No. 4, pp. 78–85 (1975)
(5) Inoue, K., Nakazato, M.: “A Study on Noise Characteristics of a Swash Plate Type Variable Delivery Axial Piston Pump”, Kayaba Industry Technical Review, Vol. 9, pp. 10–17 (1994)
(6) Ebara, C., Sano, M.: “Vibrative Force of a Piston Pump”, Transactions of the 236th Lecture Meeting, the Japan Society of Mechanical Engineers Kansai Division, pp. 37–40 (1976)

Author (organization or company)

Takashi IINO(Tochigi R&D Center)、Akihito OKUDA(Tochigi R&D Center)、Kazuaki SAKAI(Tochigi R&D Center)、Mikihiro TAKANO(Tochigi R&D Center)、Tetsushi ASANO(Tochigi R&D Center)、Koichi FUSHIMI(Tochigi R&D Center)、Masashi TANAKA(Tochigi R&D Center)

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