US 10,288,094 B2Granted

Hydrostatic drive

AssigneeRobert Bosch GmbH

InventorsCarola Spielvogel, Michael Mast, Olivier Krajka, Paul Luis Hernandez Ladera, Dietmar Bantle

Life of this patent

Estimating the term…

Loading patent…

Abstract

A hydrostatic drive includes a diesel engine and a hydrostatic adjustable machine which supplies multiple consumers in normal operation as a pump. The machine has a pressure/flow regulator to which is communicated, according to the load-sensing principle, the highest load pressure of the consumers, in particular when the machine is operated as a pump. In order to realize a start/stop function of the diesel engine, a previously charged high-pressure reservoir supplies the hydrostatic machine, which then acts as a starter motor for the diesel engine. In order to switch from pump to starter motor, the hydro-machine is adjusted over zero. In order for this switch to take place quickly and reliably, the pressure/flow regulator is deactivated by means of a switching valve and the adjustment device is supplied with an adjustment pressure medium via the switching valve, which medium is taken from the high-pressure reservoir or from an auxiliary reservoir.

Claims13

Dependent claims

A hydrostatic drive for starting an internal combustion engine, comprising:

a hydraulic machine with a swept volume, the hydraulic machine is (i) adjustable in the swept volume by a hydraulic adjustment device, (ii) operable as a pump and as a motor, and (iii) configured to drive the internal combustion engine in a mode as a motor;
at least one high pressure accumulator from which the hydraulic machine is suppliable with pressure medium via a pump line when the hydraulic machine is being operated as a motor, the pump line running between a working connection of the hydraulic machine and the high pressure accumulator;
and
an accumulator shut off valve having a first position and a second position, the accumulator shut off valve is arranged in the pump line such that a fluidic connection from the high pressure accumulator to the hydraulic machine is open in the first position and is shut off in the second position,
wherein the hydraulic machine is adjustable by the adjustment device from a positive swept volume and pump mode via a zero position, in which the swept volume is zero, to a negative swept volume and motor mode, and
wherein, for an adjustment to a negative swept volume, the adjustment device is suppliable with pressure medium from a pressure medium source via a control valve independently of the working connection of the hydraulic machine.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/501,405Filed 21 Jul 2015
Priority: DE 10 2014 215 5676 Aug 2014
Published: US 2017/0234338 A117 Aug 2017
Granted: 14 May 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification45 codes

F15B 21/14
Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass:…
B60K 6/12
Prime-movers comprising combustion engines and mechanical or fluid energy storing means: by means of a chargeable fluidic accumulator
E02F 9/2217
Hydraulic or pneumatic drives: with energy recovery arrangements, e.g. using accumulators, flywheels
E02F 9/2232
Control of flow rate; Load sensing arrangements: using one or more variable displacement pumps