The advancement of Hydro Transmissions

[Ryan03]

You are right on the money with your clarification of the differences between an allison auto and a hydrostatic drive system. Myself and 3 other techs work to maintain a fleet of 41 IH. plow trucks most are 4900 series with a dt466 and allison md 4060 world trans, the rest are newer 7400 and 7600 series with dt 570s and md 4060s I have been inside a couple of these trans and they are nothing more than a series of planetary gearsets, fiber and steel clutch packs , a torque converter driven pump and several electric solenoids in the valve body that control shifting and torque converter lockup, these are controled by a remote mounted t.c.m. [trans control module]. yes there are springs , check balls, snap rings and sensors, but I just wanted to list the basic components. One interesting piece of construction equip. relative to this discussion is a gradall G3WD which uses a eaton 9 speed manual with a clutch for transport purposes and a large variable speed hydraulic motor [hydrostatic] for excavation work from the rear cab. For those of you not familiar with a Gradall, it is basicaly a straight truck with either a single or dual rear axles depending on size and model with an excavator turntable, house, and a boom similar to that of an excavator, only with a rotational function and a telescoping function instead of the joint between the boom and dipper stick.

 

[gemini5362]

Jinman thank you for elucidating my post more clearly. Newtoy, Jinman was absolutely correct. The steel mill purchased HYDRAULIC MOTORS which are powered by HYDRAULIC PUMPS. The HYDRAULIC MOTORS have a saw blade that is mounted on the motor. A HYDRAULIC CYLINDER pushes the HYDRAULIC MOTOR/ BLADE combination into the bar in a linear motion as it cuts. The point I was trying to make was that even with a very very dull blade the HYDRAULIC MOTOR/ BLADE combination still had enough power to cut through 8 inches of steel. The tie in was that according to the manufacturers rep from the company that manufactured the HYDAULIC MOTOR and HYDRAULIC PUMP. The same HYDRAULIC MOTOR and HYDRAULIC PUMP that the steel mill purchased was used in big earth movers. The earth movers had a HYDRAULIC MOTOR attatched to each wheel and was moved by the HYDRAULIC MOTORS. Newtoy although not grammatically correct is this post easier to understand ?

 

[Maka]

Mitsubishi engines have been used by Volvo, New Holland Ingersol Rand, Cat etc....We have Mitsu engines in Montana's and of dozens and dozens and dozens I have sold not one major problem over the years.

By the way, several of the Montana tractors are a Mitsubishi engine manufactured by LG under license from Mitsubishi and they are incredible.

Maka

 

[machmeter62]

THANX FOR ALL THE REPLIES: I got a good education on the transfer of power, and the variable uses. Also, for best performance, I read about "DRAG-RACING, where it takes more power required for a GM R-4 transmission, with the lockup torque converter, then the R-3 version. Would the power required in the cruising condition still be greater with the R-4? Or is the R-4 just penalized for acceleration only, and more internal moving parts that draw power?