What is the fitting clearance between the connecting rod and the crankshaft?
1 Answers
The diameter of a passenger car crankshaft is generally around 6-7 cm, with a clearance of 0.04±0.01; the diameter of the connecting rod is generally around 4-5 cm, with a clearance of 0.03±0.01. The exact data may vary depending on the specific vehicle model, and accurate data can be found in the relevant vehicle's repair manual. Here is the relevant introduction: 1. Connecting rod and crankshaft clearance: A certain clearance between the engine's crankshaft and connecting rod is a necessary condition for its normal operation, as the crankshaft will expand due to temperature rise during operation and have some axial movement. The reserved clearance ensures it can still operate normally after expansion. However, this clearance should not be too large. If the reserved clearance is too large, abnormal axial movement of the crankshaft and connecting rod will occur during engine operation, leading to faults such as piston deflection and connecting rod bending. 2. Indicator: The assembly clearance of the crankshaft and connecting rod, as an important indicator during the assembly process, must be strictly monitored. Whether it is manual assembly or assembly line production, necessary measures will be taken to measure the crankshaft and connecting rod clearance, troubleshoot products with unqualified clearance, and ensure the clearance is qualified before proceeding to the next production step.
