21
2020-02
Structure of a Motorcycle Crankshaft
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Recently, our company has been discussing various issues related to motorcycles. Today, we are conducting an in-depth analysis of the motorcycle crankshaft mechanism.
The structure of a motorcycle crankshaft comprises journal bearings, crank arms, a crankpin, side covers, and connecting‑rod big‑end bearings. The journal bearings are provided with a first oil passage. The crank arms are connected to the journal bearings. The crankpin is housed within the crank arm and abuts the journal bearing; it includes a first oil‑buffer chamber, a second oil‑buffer chamber, and a second oil passage. The first oil‑buffer chamber is in fluid communication with the second oil‑buffer chamber, and the second oil passage is connected to the second oil‑buffer chamber. A side cover is mounted in the crank arm, forming a cavity between the side cover and the crankpin; this cavity is in fluid communication with both the first oil passage and the first oil‑buffer chamber.
The big-end bearing of the connecting rod is housed within the crankshaft arm, and the crankpin is fitted into the big-end bearing. A second oil passage connects the second oil‑buffer chamber to the big-end bearing. This utility model filters out minute foreign particles from the engine oil, thereby reducing the likelihood of such particles entering the big-end bearing and preventing bearing damage, thus extending the service life of the crankshaft assembly.
From the analysis of the motorcycle crankshaft mechanism above, it is readily apparent that the crankpin plays an indispensable role and serves as a core component of the crankshaft.
Xiexiang Machinery,Motorcycle crankshaft
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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.
2026-05-22
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The company currently employs 70 people, including over 50 frontline workers, 8 production management and sales personnel, and 4 technical staff.
2026-05-22
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2026-05-22
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We primarily manufacture and sell a full range of motorcycle crankpins and automotive piston pins.
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