Water Pump Pulley

HAWEN water pump pulleys mainly connect the engine crankshaft and water pump shaft via drive belts to realize power transmission, with a transmission ratio generally ranging from 2:1 to 4:1, which can be adjusted according to different engine speeds and water pump requirements. As an engine accessory, water pump pulleys ensure the stable operation of water pumps in water cooling systems and provide a steady coolant circulation. We welcome customers to customize products per drawings or visit our factory.

Product Specification

Product Application Fields

HAWEN (Trilon) has been deeply engaged in the machinery industry for more than 20 years. Since 2005, we have conducted in-depth R&D and production of timing pulleys for home appliance motors, automotive timing pulleys, AGV forklift timing pulleys, as well as various single-groove and multi-groove timing pulleys and drive pulleys. This product is cast from cast iron and finished with precision mechanical machining. Our products are widely used in multiple industries:

1.Automotive Engine Cooling System: The water pump pulley drives the water pump via crankshaft power to achieve coolant circulation. For example, during high-speed driving, the pulley speed can reach 3000 rpm to maintain a stable coolant flow rate.

2.Industrial Fluid Conveyance: In centrifugal pump transmission systems, the pulley transfers motor power through flexible connection, allowing speed adjustment. For instance, in sewage treatment systems, the lift can be adjusted by replacing pulleys of different diameters.

3.Agricultural Irrigation Equipment: Pulley-driven submersible pumps can adapt to complex terrains. For example, in hilly areas, the extended pulley wheelbase design enables the pump to be installed near deep wells far from the power source, preventing motor moisture damage.

4.Air Conditioning System Compressor Drive: The pulley is connected to the engine crankshaft via a multi-ribbed belt and can still meet refrigeration requirements at idle speed. For example, a certain SUV model maintains torque reserve through an automatic tensioner at idle speed.

5.Marine Engine Cooling System: Pulleys made of stainless steel can resist seawater corrosion. For example, the water pump pulley of a cargo ship's main engine operates continuously without rust in a salt spray environment.

6.New Energy Vehicle Three-Electric System: The electric water pump pulley adopts brushless motor direct drive technology, realizing precise control of battery pack temperature through stepless speed change.

Product Application Equipment and Main Customers

The above products are mainly applied to motors for industrial conveyance transmission and water pump motors, with core customers including Asco and other renowned enterprises.

Technical Parameters: Single-Groove & Multi-Groove Drive Pulleys

Core Advantages

Customer-Centric Value

HAWEN is always customer-focused, aiming to reduce costs, enhance system reliability, and shorten development cycles at every stage of product development, manufacturing, and delivery. Choosing HAWEN ensures efficiency and control across R&D, testing, production, and after-sales service.

Engineering Capability for Design Optimization

HAWEN’s technical team participates early in customer product design, evaluating industrial system requirements, application environment, and structural needs. Through systematic analysis of materials, processes, and structure, HAWEN provides mass-producible and performance-stable solutions, reducing iterations in customer validation and testing.

Automated Manufacturing for Consistency

HAWEN operates 10 fully automated production lines, including automated surface cleaning and black oxide treatment lines. All critical machining processes are completed using high-precision automated equipment, with key tolerances such as inner bore maintained at ≤0.005 mm. Automation reduces human intervention and ensures consistent, repeatable results across large volumes.

End-to-End Quality Control System

Quality management begins at raw material sourcing, ensuring consistency from the start. During production, online inspection systems monitor key process parameters in real time, enabling immediate detection and correction of deviations. The process yield rate remains stable at 99.995%, with 100% outgoing inspection, delivering reliable products to customers.

Environmentally Compliant Manufacturing

HAWEN strictly follows environmental standards in material and process selection. Products use 1215 low-carbon free-cutting steel to reduce harmful substances. Surface treatment is fully automated, avoiding manual contamination, improving corrosion resistance, and reducing waste. All products comply with international environmental standards including ROHS and REACH.

Customization and Application Matching

HAWEN provides special-shaped and customized designs based on customer industrial system requirements, ensuring full compatibility in practical applications. Early engineering support reduces later modifications and repeated testing, enhancing overall project efficiency.

Flexible Capacity and Reliable Delivery

HAWEN’s total monthly capacity reaches approximately 5 million units, with current monthly shipments of 3–4 million units. 40%–60% remaining capacity allows quick response to market changes and project scaling, ensuring stable delivery for customers.

Regional Supply Chain Advantage

Located in Zhejiang Province, a key manufacturing hub in China, HAWEN maintains long-term cooperation with local raw material and component suppliers. Short procurement lead times and reliable supply provide efficient delivery and rapid response to design changes.

Measurable Customer Outcomes

Through early engineering involvement, automated production, and stable quality systems, HAWEN helps customers achieve cost efficiency, low-noise operation, high qualification rates, and environmental compliance. Choosing HAWEN reduces total lifecycle costs across R&D, testing, manufacturing, and after-sales service.

Material Selection

Cast iron is an alloy material mainly composed of iron, carbon and silicon, with a carbon content of 2.1%-4%. Its performance is significantly affected by graphite morphology and matrix structure.

● Gray Cast Iron (HT250): Tensile strength of 250MPa, hardness of 180-250HBW, but with relatively high brittleness.

● Ductile Iron (QT500-7): Graphite is spheroidized through magnesium treatment, with tensile strength increased to 500MPa and elongation of 7%.

Cast iron features a low melting point (about 1200°C) and good fluidity, making it suitable for forming complex castings with a shrinkage rate of only 0.5%-1%. High-Silicon Cast Iron (with a silicon content of 14%-18%) is resistant to strong acid corrosion.

Process Control

To maintain the operational stability and assembly compatibility of motors, strict dimensional control is implemented during processing, which places extremely high requirements on processing equipment and process stability. Such a precise tolerance range demands top-tier accuracy of machining equipment (e.g., CNC machine tools), high-quality cutting tools, and stable process conditions (e.g., positioning fixtures, vibration suppression); any minor deviation may lead to product quality defects.

We adopt advanced manufacturing processes to ensure this precision: realized through high-precision measuring instruments (e.g., Coordinate Measuring Machine (CMM), Roundness Tester, Profile Measuring Instrument), strict process control (e.g., Statistical Process Control (SPC)) and a stabilized machining environment, which guarantees batch production consistency.

● Application Value: In precision transmission systems, inner bore tolerance directly affects the fitting accuracy between components and shafts, which is critical to transmission efficiency, noise control and product service life — it is a core technical indicator for high-end manufacturing.

We exercise strict quality control throughout the production process to ensure the stability and durability of products during use.

● Material Performance Matching: Strictly control material hardness and heat treatment processes to effectively enhance wear resistance and fatigue strength.

Surface Treatment - Electrophoresis

As drive pulleys are made of metal materials and operate in harsh environments, they are inevitably prone to rust and corrosion without proper treatment. Our company has a professional and experienced core R&D team; through years of practical experience and repeated trials, we have developed a dedicated surface treatment formula for this product, and adopted fully automatic electrophoresis equipment integrated with a fully automatic drying system.

There is no manual contact with products throughout the entire process, which not only enhances the corrosion resistance of products to meet industry standards, but also reduces the risk of product collision caused by human contact and ensures the operational stability of products.

Other electroplating processes such as general electroplating, zinc plating and nickel plating are also available and can be fully customized according to customer requirements.

Environmental Requirements

All products meet strict environmental protection requirements in terms of raw material selection and surface treatment processes, and are supported by official ROHS and REACH certification reports.

R&D & Customization Capabilities

Our professional R&D and technical team has 20 years of in-depth industry experience. We can fully meet customer requirements, solve their technical pain points according to their specific application scenarios and demands, and customize special-shaped pulleys. We warmly welcome customization per provided drawings, including customized products with designated raw materials and surface treatment processes. We also extend a sincere invitation to overseas visitors to visit our manufacturing factory.

Synergy from the New Organizational Structure

The synergy brought by the new organizational structure enables HAWEN to fully meet customer expectations on the basis of in-depth and effective cooperation.

Domestic Customers & Market Share

We have established long-term strategic partnerships with domestic customers such as Asco and Haier, with a stable cooperative relationship spanning more than a decade. Up to now, our company has achieved a 50% market share of timing pulleys in the Chinese market.