Why Does Only BMW Use ZF Transmissions?
2 Answers
Because BMW can be considered ZF's largest client, having ordered transmissions from ZF for many years. Most BMW models use ZF transmissions, with only a few front-wheel-drive models using Aisin transmissions. Below is some relevant information: 1. Structure: Structurally, ZF's 8-speed automatic transmission primarily consists of a torque converter, three sets of planetary gear mechanisms, clutch brakes, and a hydraulic control mechanism. The torque converter transmits engine power to the transmission, while the planetary gear mechanisms and clutch brakes are responsible for forming the eight gear ratios. The hydraulic control mechanism manages the clutches and brakes. 2. Transmission Issues: Although ZF's 8HP transmission is one of the top-performing and most reliable 8-speed transmissions available, it comes with a relatively high cost. Additionally, the gear ratio difference between the 1st and 2nd gears is quite significant, and even with the torque converter's buffering effect, slight movements can still be felt.
BMW and ZF have an exceptionally close relationship, largely because both are German companies located in close proximity geographically. The tuning of ZF's 8AT transmission is a perfect match for BMW engines, boasting lightning-fast gear shifts and exceptional smoothness, fully aligning with BMW's pursuit of sporty performance. Other luxury brands like Rolls-Royce and Jaguar also use ZF transmissions, though they don't promote it as prominently as BMW. I believe the key reason is BMW's willingness to invest in custom R&D, with ZF specifically optimizing the structure for BMW models, even designing unique installation positions. However, domestic car brands have started sourcing ZF transmissions too—for instance, the Tank series uses the latest 8AT, proving that the technological monopoly has long been broken.
