Chongqing Xiexiang Machinery Manufacturing Co., Ltd.-Motorcycle crankshaft

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XIEXIANG - FOCUS ON PRODUCT QUALITY

Xie Xiang · Committed to Product Quality

Founded in 2002, the company primarily manufactures and sells a wide range of motorcycle crankpins and automotive piston pins. With over a decade of specialized experience in producing motorcycle crankpins...

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XIEXIANG - EXQUISITE MANUFACTURING TECHNIQUES

Xie Xiang · Exquisite Manufacturing Process

We have over 80 pieces of production equipment, including high-precision centerless grinders, dedicated drilling machines, CNC chamfering machines, and several CNC drilling machines, as well as dozens of other essential machining tools.

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XIEXIANG -FINE WORKMANSHIP CREATES FINE PRODUCTS

Xiexiang: Precision Craftsmanship Creates Exquisite Quality

The company operates more than 80 pieces of production equipment, including high-precision centerless grinders, dedicated punching machines, CNC chamfering machines, and several CNC drilling machines, along with dozens of other essential machining tools.

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XIEXIANG - SERVING THE WORLD WITH EXCELLENCE

Xie Xiang: Serving the World with Exquisite Quality

The company’s products are also directly exported to Malaysia, Pakistan, India, Vietnam, and other countries, earning high praise from overseas customers.

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PRODUCTS

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∮20×∮8×49 (sandblasted)

The piston pin is a cylindrical pin fitted into the piston skirt. Its middle section passes through the small end bore of the connecting rod, serving to connect the piston and the connecting rod. Its function is to transmit the gas‑force acting on the piston to the connecting rod, or to enable the connecting‑rod small end to drive the piston in motion. To reduce weight, piston pins are typically manufactured from high‑quality alloy steel and are made hollow.

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∮20×∮8×49

Under high-temperature conditions, the piston pin is subjected to significant cyclic impact loads. Moreover, because the piston pin swings only through a small angle within the pin bore, it is difficult to form a stable lubricating oil film, resulting in poor lubrication. Consequently, the piston pin must possess adequate stiffness, strength, and wear resistance. Its mass should be kept as low as possible, and the fit between the pin and the pin bore should provide an appropriate clearance while ensuring excellent surface quality. In general, the stiffness of the piston pin is particularly critical; if the pin bends or deforms, it may lead to damage to the piston pin seat.

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∮23.1×39 (Type 70)

The crank pin consists of a dowel and a countersunk screw. Its distinguishing feature is that the dowel comprises two wedge-shaped elements, 1 and 2; the inner surfaces of these two wedges are inclined planes, while the outer surface of wedge 2 is a flat plane that closely mates with the bicycle’s bottom bracket spindle. The outer surface of wedge 1 is an arcuate surface that fits snugly against the arcuate surface of the crank pin hole in the bicycle frame. At each end of wedges 1 and 2, a countersunk screw 3 is fastened, so that under the action of these two screws, the inclined surfaces of the two wedges come into close contact and slide axially until the crank is locked in place.

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∮25.1×39 (Type 100)

In small- and medium-displacement motorcycle engines, a split-type crankshaft–connecting‑rod assembly is typically formed by press‑fitting the left and right crankpins to the crankshaft journal; the connecting‑rod big end employs a needle roller bearing with a cage. Using a modular crank design eliminates the need for large forging equipment during blank production and facilitates various heat‑treatment and machining operations, thereby effectively shortening the production cycle.

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PRODUCTS

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∮20×∮8×49 (sandblasted)

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OUR

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2026-05

Strong technical capabilities

The company currently employs 70 people, including over 50 frontline workers, 8 production management and sales personnel, and 4 technical staff.

2026-05

The factory is equipped with advanced machinery.

We have over 80 pieces of production equipment, including high-precision centerless grinders, dedicated drilling machines, CNC chamfering machines, and several CNC drilling machines.

2026-05

A full range of products is available.

We primarily manufacture and sell a full range of motorcycle crankpins and automotive piston pins.

Corporate culture

Xiexiang Machinery adheres to the business philosophy of “Customer First, Integrity Above All” in serving its valued customers.

Corporate Strength

The company occupies approximately 6 mu of land, with a factory floor space exceeding 3,000 square meters. It is equipped with more than 80 pieces of production equipment.

Organizational Structure

The company currently employs 70 people, including over 50 frontline workers, 8 production management and sales personnel, and 4 technical staff.

ABOUT

About Us

Chongqing Xiexiang Machinery Manufacturing Co., Ltd.

SINCE 2002

(Formerly Chongqing Rujiji Machinery Manufacturing Co., Ltd.), located within the Qinggang Industrial Park in Bishan District, Chongqing, just 2 kilometers from the Chengdu–Chongqing Expressway entrance, enjoying extremely convenient transportation. Established in 2002, our company primarily manufactures and sells a wide range of motorcycle crankpins and automotive piston pins. With over two decades of specialized experience in producing motorcycle crankpins, we occupy approximately 6 mu of land, with factory facilities spanning more than 3,000 square meters. We are equipped with over 80 pieces of production equipment, including high-precision centerless grinders, dedicated drilling machines, CNC chamfering machines, several CNC drilling machines, and dozens of other essential machining tools. As a professional manufacturer of motorcycle crankpins, we have also invested in a comprehensive suite of testing instruments: a metallographic cutting machine, microscopes, and hardness testers for examining the microstructure after heat treatment; as well as roundness testers, projectors, surface roughness testers, comparators, three‑coordinate measuring machines, and spectrometers to assess dimensional and geometric accuracy, and surface finish.

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More information

2026-05-27

How is the growing demand in the fire‑fighting motorcycle market driving the development of related component industries?

As demand for fire‑fighting motorcycles continues to surge, the related components industry is undergoing a profound structural transformation. With engines and transmission systems serving as the core power units, order volumes have risen sharply, prompting manufacturers to accelerate capacity expansion while raising standards for output stability, high‑temperature resistance, and response speed—thus propelling technological advancement into overdrive.

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2020-03-28

Repair of Cracks in the Crankshaft Journal

Chongqing Xiexiang Machinery Manufacturing Co., Ltd. specializes in the production and sale of crankshaft pins. It is a manufacturer, producer, and supplier of crankshaft pins based in Chongqing. From a highly professional standpoint, we analyze how cracks in crankshaft pins can be repaired. Cracks that occur in non‑load‑bearing areas or that do not propagate may be repaired. However, when cracks appear in load‑bearing regions such as the pin‑shoulder arm or the pin journal, the component must be replaced. Accordingly, our crankshaft pins are required to possess adequate strength and rigidity, while their journal surfaces must exhibit wear resistance, uniform operation, and excellent balance.

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2020-03-27

Repair of Motorcycle Crankshaft Pins

As an editor who has specialized in the motorcycle crankshaft industry for over a decade, I’ve long understood that crankshaft production demands extremely high levels of technical precision. So how should a crankpin be repaired? First, let’s examine the crankpin’s dimensional accuracy: when the roundness and cylindricity errors of the crank journal exceed 0.01–0.0125 mm, grinding must be performed on a dedicated crankpin grinder. The radial runout of the crankpin should generally not exceed 0.04–0.06 mm; if it exceeds 0.10 mm, corrective measures are required.

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2020-03-24

Inspection for Damage to the Motorcycle Crankshaft Pin

Chongqing Xiexiang Machinery Manufacturing Co., Ltd. specializes in the production of crankshaft pins. During their use, a variety of issues can arise. So, what are the methods for inspecting damage to crankshaft pins?

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