SU86239A1 - Power installation with internal combustion engine and hydraulic power transmission - Google Patents

Description

Known power plant with internal combustion engines li with hydraulic transmission of power to the working body of the consumer. In such installations, conventional engines are used; The design scheme that drives the pump shaft, KOTOpbiii, feeds the working fluid one or several hydraulic motors. In the presence of a piston type pump and volumetric hydraulic motors, the installation can also include intermediate receivers used as pressure accumulators. The disadvantage of existing installations with volumetric hydraulic transmission is that, when the pump and hydraulic motor work together, the inertia of the rotating masses of the engine (flywheel, shaft) slows down the transition to a new rotational speed set by a regulator or by hand.

To eliminate this drawback, as well as to reduce mechanical losses and reduce the unit weight in the described invention, a real engine pump with free pistons is used. In addition, the unit uses volumetric hydromotors equipped with a cylindrical outer rotor-casing with built-in rotating blades with an internal body-closer, having the form of a symmetric contour with double eccentricity. The blades are placed in pairs and, to ensure the roar of the unit's productivity, are tilted in opposite directions.

FIG. 1 shows a general scheme of installation: in FIG. 2 - section of the hydraulic motor.

The working fluid is supplied by a free-piston motor pump to the flow receiver /. An air cushion above the liquid level in receiver 1 contributes to the elimination of pulsations and allows energy to be stored. The receiver / is equipped with a safety relief valve 2, which in FIG. 1 CONDITIONALLY placed at the top of the receiver.

From the receiver, through the controller 3 and the reversing valve 4, the working fluid flows to the hydraulic motors 5. The controller represents the co6oi and spool, by turning which produces from the pedal 6;

No. 86239 2 The valve 4 switches the flow of fluid from the forward to the rear. When switching, the injection line 7 of the hydromotors turns into a dropping one. Through the low pressure pipeline, the working fluid through the radiator 8 is returned to the pump cylinders, and the excess can be drained into the tank 9. The motor-pump is controlled by the use of pump 10.

Due to the direct transformation of the engine-pump of the energy of gas discharge to the working fluid injection and the absence of rotating masses, a change in the flow of fuel or air-fuel mixture into the engine causes an instant change in the mode of operation of the hydraulic part of the unit.

The regulation of the hydraulic part is carried out by transferring a part of the injected fluid into the low pressure pipeline, which is accompanied by a corresponding loss of energy. In order to reduce this loss, the maximum expansion of the limits of the regulator valve of the engine pump itself is provided. To widen the range of pressures and flow rates of the working fluid, the regulation of the pump motor must be carried out jointly by changing the magnitude and number of strokes of the pistons. This method of regulation can be implemented, for example, by using energy accumulators for reversing the linear engine — a pump (compression stroke in the engine cylinder) in the form of pneumatic buffer cylinders with variable air pressure or springs of variable stiffness.

When using the described power plant on any transport device (for example, on a vehicle), braking can be carried out with the engine-pump turned off by turning the motors into pumps, for which it is sufficient to switch the directions of the feed and return flows. In this case, the fluid will be pumped from the low-pressure receiver (tank 9) to the supply receiver /, increasing the pressure in the latter and thus accumulating the braking operation.

In each of the installation motors, the rotor-casing 11 carries in-line blades 12 embedded in it, with the inclination of the blades in opposite directions reversing the motor by simply changing the direction of fluid flow, and the inlet channels turn into diversion channels. The working fluid enters and is discharged through channels in the stator 13- which is made in the form of a symmetrical body of double curvature. The areas filled with high-pressure fluid are marked on the diagram by cross-flow, the areas of low pressure are simple-flow. The direction of rotation of the rotor (according to the drawing) is counterclockwise.

Subject invention

Claims (2)

1. A power plant with an internal combustion engine and hydraulic power transmission mainly for transport vehicles using a pressure pump, intermediate receivers and volumetric hydraulic motors, characterized in that, in order to improve the design and economic performance, as well as to facilitate adjustment the engine, when the pump and the outboard motors work together, a working motor-pump with free pistons is used to supply the working fluid. 2. In the power plant according to claim. 1, the regulation of the engine-pump, in order to achieve the maximum pressure range and flow rates of the working fluid, is carried out by jointly changing the number and size of the strokes of the pump.