Hybrid Hydraulic Transmission with the Accumulator as the Frame of the Vehicle

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Related patents: US 8,079,438; 8,567,544; Japan 5,600,323 Europe: patent pending

This apparatus (The DynaDrive) relates to a system applicable to all types of terrestrial vehicles, using any prime mover. The system is especially attractive for industrial applications. Said prime mover could be any engine or electrical motor. When the prime mover is running, it will be only at a constant speed and torque; a variable flow hydraulic device is connected to the prime mover and acts as a “power integrator,” receiving hydraulic power from the accumulator, mechanical power from the prime mover, or a combination thereof, supplying the desired flow and pressure to the hydraulic motors. A connected second variable pump reloads the accumulator with the remnant power, if any, during the whole cycle. The accumulator will be quite large. The braking energy will be returned to the accumulator (75%). The whole vehicle is controlled by wire, and uses only one joystick to control speed, direction, acceleration, braking and in some cases including steering.

An accumulator, which operates as an energy storage, is positioned as the load bearing frame of the vehicle,

1. The novelty
Any classic hybrid hydraulic system has a significant handicap: steel accumulators, albeit being much cheaper than electrical batteries, last forever and create no heat, can weigh more than fifty (50) times the weight of a lead-acid battery per unit of stored energy, and an even worst ratio with more modern batteries. As a result, all or most, accumulators used for present hybrid hydraulic applications are quite expensive, too small, made of fiber, for high pressure and may be usable only for short cycles, mainly for brake energy recuperation and release.

Replacing the frame with a rigid steel accumulator makes now a Hydraulic accumulator figuratively weightless, as it replaces the present frame. The engine becomes much smaller (and lighter), depending of the used cycle of the vehicle, and the following parts are eliminated: Gear box, clutch, differential, standard brake, shaft, drive train, mechanical accelerator and many others.

2. The novel hybrid hydraulic circuit allows for the full efficient use of the power available, as well as the accumulator saved energy, far superior to the present hybrid hydraulic systems and much better than an electric Hybrid, especially for heavy industrial applications.

3. Production
A heavy wall steel pipe with both ends capped will be the frame of the vehicle for industrial applications. To it, we attach all the off-the-shelf needed parts. The end result, a vehicle in its multiple applications, is less costly to produce, to operate (major energy savings) and to maintain, compared with classical and present applications.

4. The market
The market entails many large industries and applications, with numerous players, including, city Vans, school buses, yard Hustlers, garbage trucks, taxis, bulldozers, post office delivery, airplane tractor, airport buses, tramway, underground, city buses, automobiles, etc.


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  • Name:
    Allan Rosman
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  • Allan is inspired by:
    The effort to make sense of reality and improve the products from the stand point of lower first cost, lower operating cost and in general, to have major energy savings in production and operation
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