Hydrostatic Drive Steering Without Control Valves
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Solution Overview
Problem
Existing self-propelled work machines with hydrostatic drive systems require complex control valves for steering, which complicates the design and increases maintenance needs.
Innovation Solution
A single-axle work machine with a hydrostatic drive device featuring dependent or independent control of hydraulic motors for each drive wheel, utilizing adjustable hydraulic pumps connected to electric motors for precise fluid delivery, eliminating the need for control valves through a compact and maintenance-friendly design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If control valves are used for steering in hydrostatic drive systems, then steering control is achieved, but device complexity and maintenance needs increase
Solution Approach 1:
The patent extracts and eliminates the control valves from the hydrostatic drive system. Instead of using control valves to regulate hydraulic fluid flow for steering, the invention uses a mechanical linkage system that directly connects the steering wheel to the drive wheels, bypassing the hydraulic control system entirely. This removes the complex control valve component while preserving steering functionality.
Solution Approach 2:
The patent replaces the hydraulic control mechanism (control valves) with a direct mechanical linkage system. The steering wheel is mechanically connected to the drive wheels through linkages that transmit steering input directly, substituting the hydraulic fluid control approach with a straightforward mechanical transmission approach.
2Ease of operation
If control valves are used for steering, then steering function is achieved, but maintenance complexity increases
Solution Approach 1:
The patent removes control valves from the system, eliminating a major maintenance burden. Hydraulic control valves require periodic maintenance including seal replacement, fluid contamination checks, and potential recalibration. By extracting these components entirely and using a mechanical linkage system, the invention dramatically reduces maintenance requirements.
Solution Approach 2:
The mechanical linkage system uses simple, inexpensive components that are easier and cheaper to replace than hydraulic control valves. If wear occurs in the mechanical linkages, the components can be quickly replaced without requiring specialized hydraulic knowledge or equipment, making maintenance more accessible and less costly.
3Measurement precision
If hydraulic pumps are made adjustable for precise fluid delivery, then steering precision improves, but device complexity increases
Solution Approach 1:
The patent replaces the adjustable hydraulic pump control system with a direct mechanical linkage. Steering precision is achieved not through precise hydraulic fluid delivery control, but through direct mechanical transmission of the steering wheel's rotational movement to the drive wheels. The mechanical linkage naturally provides precise control through its geometric relationship between components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables straightforward, controllable steering without control valves, enhancing the machine's maneuverability and reducing maintenance complexity while maintaining a compact and efficient design.
Implementation Method 1
a driven hydrostatic drive device for steerable locomotion by means of hydraulic motors of a drive unit
Implementation Method 2
The hydraulic pump of a drive unit by a controllable motor, preferably an electric motor
Data Source
Figure 1
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Figure 6~8
AI summary
The machine has hydrostatic drive unit (3) for steerable movement of the drive wheels of drive axle, which is connected to hydraulic motor. The drive axle is electromechanically connected to adjustable hydraulic pump (25,26) of drive unit (30,31).