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Hydraulic driveline with a secondary module

A technology of hydraulic transmission, drive train, applied to components with teeth, fluid pressure actuated system components, transmission control, etc.

Active Publication Date: 2019-04-26
DANA ITAL SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, efficient and flexible operation of systems including hydraulic travel functions and secondary functions continues to challenge developers

Method used

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  • Hydraulic driveline with a secondary module
  • Hydraulic driveline with a secondary module
  • Hydraulic driveline with a secondary module

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0049] figure 1 A serial hydraulic hybrid powertrain 1 including a power hub (powerhub, or “power hub”) 2 is schematically shown. The hydraulic hybrid powertrain 1 includes an engine 3 driving a hydraulic variable displacement pump 4 . The power hub 2 is located between the pump 4 and the hydrostatic variable displacement motor 5 . The power hub 2 allows the hydraulic hybrid powertrain 1 to store hydraulic energy in a pair of hydraulic accumulators 6a, 6b when possible and to resupply the hydraulic energy when needed to save fuel or improve the performance of the hydraulic hybrid powertrain 1 performance. The high-pressure accumulator 6a and the low-pressure accumulator 6b together form a hydraulic accumulator assembly and are configured, for example, as a hydro-pneumatic bladder accumulator.

[0050] The pump 4 and the motor 5 are in fluid communication through a first main fluid line 7a and a second main fluid line 7b. The first main fluid line 7a, which typically has a ...

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Abstract

The invention refers to a hydraulic driveline (1) for a vehicle. The hydraulic driveline comprises a main hydraulic circuit (8) with a first hydraulic displacement unit (4) which is fluidly connectedwith a second hydraulic displacement unit (5), said second hydraulic displacement unit (5) forming a primary hydraulic load of the driveline, the first hydraulic displacement unit (4) being drivinglyconnected with a combustion engine (3). The driveline further comprises a hydraulic accumulator assembly (6a, 6b) which is selectively fluidly connected to the main hydraulic circuit by one or more controllable valves (HPA, HPB, LPA, LPB) of a first group of valves, wherein the driveline further comprises a first secondary module (28, 28') that comprises a first fluid communication (23, 23', 24, 24') of the hydraulic accumulator assembly (6a, 6b) with a first secondary hydraulic load (27, 37) of the hydraulic driveline. The first fluid communication comprises one or more controllable valves (20, 20', 21, 21', 22) that allow connecting the hydraulic accumulator assembly (6a, 6b) with the first secondary load (27, 37) or separating the hydraulic accumulator assembly (6a, 6b) from the first secondary load and that belong to a second group of valves, wherein the controllable valves of the second group of valves are controllable independently of the controllable valves of the first group ofvalves.

Description

technical field [0001] The present invention generally relates to a hydraulic powertrain for a vehicle comprising a main hydraulic circuit, a main hydraulic load and a hydraulic accumulator assembly for hydraulic energy storage and a hydraulic secondary module and a method of operating the same . Such hydraulic hybrid transmissions can often be found in off-highway vehicles and work machinery used in agriculture, mining or construction, such as tractors, wheel loaders, wheel excavators, backhoe loaders, telehandlers, dump trucks, etc. . Background technique [0002] Closed circuit configurations and hydraulic pressures up to 420-450 bar are typically used for hydrostatic travel functions in heavy operating machinery, while open circuit configurations and hydraulic pressures up to 250-300 bar are more commonly used for secondary functions such as work functions, and other levels The hydraulic pressure can be used for other secondary functions, such as auxiliary functions. ...

Claims

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Application Information

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IPC IPC(8): F16H61/4078B60K6/12F16H61/4096F15B21/14
CPCB60K6/12B60W2300/17F16H61/4078F16H61/4096Y02T10/62B60K11/06B60S9/10B60T13/14E02F9/2217E02F9/2225E02F9/2292E02F9/2296F16H61/4035F16H61/44
Inventor G·奥内拉C·M·乔奇欧 博尔特D·莫泽
Owner DANA ITAL SRL
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