A compact crankshaft and engine
By employing a large main journal directly connected to the crankpin in the crankshaft of a horizontally opposed four-cylinder engine and forming an overlapping design, the problem of reduced crankshaft stiffness when shortening axial length is solved, achieving a compact crankshaft design with high stiffness and low resonance, thus improving engine performance.
Patent Information
- Application Number
- CN202610808796.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-05
- Publication Date
- 2026-07-17
AI Technical Summary
When the axial length of the crankshaft in a current horizontally opposed four-cylinder engine is shortened, the bending stiffness decreases, leading to an increased risk of resonance and affecting the engine's operating quality.
The design employs multiple main journals, with small main journals at both ends of the axial direction and a large main journal in the middle. The diameter of the large main journal is larger than that of the small main journals. They are connected to the small main journals via cranks. Each large main journal is directly connected to two crank pins on both sides of the axial direction, forming an overlapping portion on a plane perpendicular to the axis, increasing the overlap to improve rigidity.
While shortening the axial length, it significantly improves the bending stiffness and bending resistance of the crankshaft, reduces the risk of resonance, and improves the engine's operating quality and vehicle compatibility.
Smart Images
Figure CN122407667A_ABST