EX200-1 HPV145

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EX200-1 HPV145 Hydraulic Gear Pump Technical Analysis

(Based on hydraulic engineering principles and excavator application scenarios; parameter references from Komatsu OEM technical documents)

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I. Core Identity & System Integration

1. Model Identification

• EX200-1: Komatsu's20-ton class hydraulic excavator(mid-range model for construction/landscaping).

• HPV145: Ahigh-pressure variable displacement gear pump(HPV series) designed for excavator main circuits, with145 cc/rev displacement(nominal capacity).

2. System Role

• Primary Function: Serves as themain hydraulic power sourcefor the excavator, supplying oil to:

• Swing motor

• Travel motors

• Arm/boom/bucket cylinders

• Key Advantage: Variable displacement technology enablespressure-flow balancing, reducing energy waste compared to fixed-displacement pumps.

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II. Technical Parameters & Performance Metrics

【表格】

Parameter Specification Industry Relevance

Displacement (cc/rev) 145 (nominal) Directly impacts oil flow rate (higher = faster action).

Max. Pressure (MPa) 34.3 (Komatsu-tested) Ensures sufficient force for heavy-duty digging (e.g., 1.2m³ bucket).

Rotation Speed (rpm) 1800–2200 (rated) Matches engine output for optimal power transfer.

Efficiency @ 30MPa 85% (volumetric) High efficiency reduces fuel consumption.

Noise Level (dB) ≤85 (compliant with ISO 12100) Quieter operation for urban construction.

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III. Technical Highlights

1. Variable Displacement Mechanism

• Principle: Aswash plate angle adjuster(servo-controlled) dynamically changes pump displacement based on load demand.

• Example: During swing/travel motions (low load), displacement reduces to100–120 cc/rev, cutting energy loss by20–30%vs. fixed-displacement pumps.

2. Pressure Compensation System

• Scenario: When multiple actuators (e.g., boom + arm) operate simultaneously, the pumpautomatically prioritizes pressure supplyto avoid cavitation.

• Test Data: In compound motions, pressure stability remains within±3% of target value(Komatsu lab results).

3. Durability Features

• Bearing Design:Tapered roller bearingswith30,000-hour lifespan(under rated load).

• Seal Technology:Double-lip PTFE sealsprevent oil leakage even at90°Ctemperatures.

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IV. Application Scenarios & Selection Guide

1. Recommended Work Conditions

• High-Load Tasks:

• Rock breaking (with hydraulic breakers)

• Deep trench digging (2–3m depth)

• Energy-Saving Tasks:

• Material handling (light loads)

• Swing-only operations (e.g., loading trucks)

2. Selection Pitfalls

• Flow Mismatch: Using a pump withhigher displacement than needed(e.g., 160 cc/rev instead of 145 cc/rev) increases fuel consumption by10–15%.

• Temperature Limits: Operating above95°Creduces seal lifespan by50%(use coolers in tropical regions).

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