As one of the core components of Yamaha AEROX 155, a popular sport scooter, the dedicated oil pump acts as the “lubrication heart” of the engine. It delivers engine oil at precise pressure to the AEROX 155’s Y155 single-cylinder four-stroke engine. Additionally, it adapts to the engine’s high-speed, high-power operating conditions. It directly affects the vehicle’s power output stability and engine lifespan.
I. Core Positioning of the AEROX 155 Oil Pump: Tailored for Sporty Operating Conditions
The AEROX 155 is designed for “urban commuting + short-distance sport riding.” The engine of AEROX 155 often operates in the high-speed range of 6000-10000rpm. This is particularly common during scenarios like sudden acceleration or overtaking. Such high-speed operation places higher demands on the oil’s “delivery efficiency” and “pressure stability.” Ordinary universal oil pumps may cause insufficient lubrication due to mismatched flow rates. Designers have tailored the dedicated oil pump for AEROX 155 to the structural characteristics of the Y155 engine from the very design stage:
Precise installation dimension fit: The oil pump’s housing and transmission gear pitch fully match the crankshaft end and oil tank interface of the AEROX 155 engine, avoiding transmission noise or oil leakage caused by installation gaps.
Optimized speed synchronization: Driven directly by the crankshaft gear, the oil pump speed is strictly synchronized with the engine speed. This ensures that oil flow increases synchronously with power demand at high speeds, preventing “oil supply lag.”
II. Three Core Functions: Key to Protecting the AEROX 155 Engine
The oil pump for AEROX 155 provides full-cycle protection for the engine through “precision oil supply + multi-dimensional protection,” which can be broken down into three core functions:
1. Forced Lubrication: Reducing Component Wear at High Speeds
The AEROX 155’s engine contains dozens of high-speed rotating metal components, including pistons, valves, and camshafts. The friction coefficient of these components increases significantly at high speeds. Most dedicated oil pumps for AEROX 155 adopt a gear-type pressure structure, specifically an external gear design. This design features stable flow and low pressure loss. With this structure, the oil pump pressurizes the oil in the tank and delivers it to various friction points through preset oil passages:
Forms an “oil film protective layer” between the piston and cylinder wall, avoiding cylinder scoring caused by direct metal contact.
The oil pump provides continuous lubrication for the valve rockers and camshafts of the AEROX 155. This alleviates wear on the valve mechanism when the vehicle undergoes frequent sudden acceleration.
2. Auxiliary Cooling: Balancing High-Temperature Engine Conditions
As a scooter, the AEROX 155’s engine relies mainly on air cooling + oil cooling (no water cooling system). The oil pump acts as a “heat transfer medium transporter” in this process: after the oil is pumped to high-temperature components (such as the cylinder head and crankshaft bearings), it absorbs heat generated by component operation and releases it through the radiator fins of the oil tank. The stable oil supply of the oil pump directly determines heat dissipation efficiency, preventing power loss due to local overheating of the engine.
3. Impurity Filtration: Reducing the Risk of Oil Passage Blockage
The inlet of the AEROX 155 oil pump is integrated with a dedicated filter screen (with a different pore size from ordinary models, adapting to the viscosity characteristics of the Y155 engine oil). It can filter metal debris, dust, and other impurities in the oil, preventing impurities from entering the oil passages with the oil and blocking key components (such as injectors and valve oil passages). It is especially suitable for complex urban riding environments with “high dust and frequent traffic jams.”
III. Performance Advantages of the AEROX 155-Adapted Oil Pump: Different from Universal Oil Pumps
Compared with universal motorcycle oil pumps on the market, the oil pump specifically designed for AEROX 155 has three irreplaceable advantages:
Pressure parameter adaptation: The Y155 engine of the AEROX 155 requires an oil pressure of 2.5-3.5bar (at idle) and 4.0-5.0bar (at high speed). The pressure regulating valve of the dedicated oil pump is calibrated to precisely control the pressure range, avoiding oil seal leakage due to excessive pressure or insufficient lubrication due to low pressure.
Upgraded material weather resistance: Designers took into account the AEROX 155’s frequent short-distance starts, such as during urban commuting. They made the oil pump’s gears from high-strength powder metallurgy material and also sealed the housing with oil-resistant rubber. It can withstand the impact of frequent starts and stops, reducing gear wear after long-term use.
Low-noise design: By optimizing the gear tooth profile (adopting circular arc teeth instead of straight teeth), the gear meshing noise of the oil pump during operation is reduced. It matches the AEROX 155’s “quiet sport” positioning, avoiding additional mechanical noise during riding.