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Honda's older transmissions such as the Hondamatic semi-automatic transmission and its successors use traditional, individual gears on parallel axes like a manual transmission, with each gear ratio engaged by a separate hydraulic clutch pack. This design is also noteworthy because it preserves engine braking by eliminating a sprag between first ...
The 9HP is only 0.24 inches (6 mm) longer than, and weighs 16.5 lbs (7.5 kg) less than, the outgoing six-speed transmission. The compact packaging is achieved by using a number of innovative design features: a new compact hydraulic vane-type pump, two patented dog clutches, [3] which replace bulkier conventional clutch packs, and a nested gear set. [2]
The original Hondamatic, like all following Honda automatics, featured gears on parallel axes rather than planetary gears like most other automatic transmissions. The two gears for each ratio - one driving and the other driven - are in constant mesh and each ratio is engaged by a dedicated clutch connected to one of the ratio's two gears.
The four shaft H5 transmissions are much more robust and do not exhibit the same failure rate as the three shaft H5. The new design first entered service in the 2005 Acura RL. All heavier vehicles eventually moved to this design in the following years until it was ultimately replaced by the H6, which also uses four shafts.
Forward gear ratios are infinitely variable between 3.172–0.529 and reverse gear ranges from 4.511~1.693. Final drive is 4.20:1. On Insight EX models, paddle shifters mounted behind the steering wheel allow the driver to engage a manual shift mode and select from seven simulated gear ratios for full control over acceleration and engine braking.
The designation of wide versus close ratio affected the lowest gear ratio; [7] for example, the four-speed Muncie transmissions offered in General Motors performance vehicles included the M20 "wide ratio" transmission, which had a first gear ratio of 2.52 or 2.56:1, while the M21 and M22 "close ratio" transmissions had a first gear ratio of 2. ...
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The H4A was a modified version of Honda's first 4-speed automatic transmission, the H4. Introduced in 1990 on the flagship Honda Accord, the H4A series had three shafts, rather than the two found on the H4. It was replaced by the light-duty M6HA series and medium-duty B7XA. Applications: 1990– Honda Accord (PX4B) 1991–1992 Honda Accord (APX4)