Hondamatic

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H2
Overview
ManufacturerHonda
Production1976–1988
Body and chassis
Class2/3-speed transverse automatic transmission
Chronology
SuccessorH3
See also list of Honda transmissions for other Hondamatics

The Hondamatic (also called the H2) was Honda's first automatic transmission. It was produced from 1973 through 1988. The Hondamatic name continued to be used on fully automatic transmissions from Honda.

The original Hondamatic, like all following Honda automatics, featured sliding gears on parallel axes rather than planetary gears like most other automatic transmissions. The design preserved engine braking by eliminating a sprag between the first and second gears[citation needed]. Shifting between forward gears was done by simply sliding the gear selector from 1 to 2. It did not automatically shift, but because of the torque converter, could be driven entirely in second gear. The Honda torque converter had a lockup, leading the company to sell the original Hondamatic (which had just two forward gear ratios) as a three-speed. The true three-speed H3 was launched in 1979. In 1982 Honda introduced a four-speed full automatic (called "Hondamatic Full Auto"), followed by a fully automatic three-speed in 1983. The semi-automatic version continued to be available in Honda's smaller cars, where it was gradually replaced by conventional automatics. With the 1988 remake of the Honda Acty/Street, the last Hondamatic was discontinued.

Applications:

History[edit]

Honda could not make a conventional planetary gearset automatic transmission without infringing on any patents. Honda eventually asked Borg Warner to design a prototype transmission for their upcoming vehicles. However, Borg-Warner declined. This was due to Borg-Warner not having transmission specifications that were efficient enough for such a small engine like the 500cc Honda S500 and one that was able to be reliable at a maximum engine speed of 8000rpm. This led Honda to design their own transmission. They purchased a transmission from Borg Warner for the purpose of developing an original transmission design. They tested their newly developed automatic transmission on the L700. When testing and refinements had been made, Honda sold their first automatic transmission in the N360.[1]

Motorcycle[edit]

The Hondamatic was later used in Honda's 400, 450 and 750 cc motorcycles.[2][3] In this application, it was not a true automatic transmission, as the driver had to manually select one of the two gears, though Honda's torque converter meant that no clutch was needed.

Applications:

Scooter, ATV, and power equipment[edit]

Honda also applies the Hondamatic name to a hydraulic piston-based continuously variable transmission used in motorscooters, all-terrain vehicles, and other types of power equipment.

See also[edit]

References[edit]

  1. ^ "Honda Global - Honda Motor Co.,Ltd". Global.honda. Retrieved 10 March 2019.
  2. ^ Motorcycle Classics Nov/Dec 2011: The Honda CB750A Hondamatic
  3. ^ Assoc, American Motorcyclist (1 September 1977). "American Motorcyclist". American Motorcyclist Assoc. Retrieved 10 March 2019 – via Google Books.