机械设计6第6章键花键和销连接

Mechanical analysis and failure types
Strength evaluation
Ψ: 载荷分配不均系数; z: 花键的齿数; l: 齿的工作长度; h:键的工作高度; rm: 平均直径.
2) Involute spline (渐开线花键)
3) Triangle spline (三角形花键)
2) Woodruff key connection
3) Tapered key connection
4) Tangential key connection
II. Spline connection
Characteristics
Classification of splines
1) Straight-sided spline (矩形花键)
It is most commonly used.
Classification of the square or rectangular key
Oriented flat key
Sliding flat key
Mechanical analysis
Strength evaluation
Use two keys： if one key hasn’t enough carrying ability, you can use two keys. Two keys should be arranged at an angle of 180 degree circumferentially, but only 1.5 key can be used in strength calculation due to non-uniform loading between two keys.
Homework

Problem 6-3 on page 115 (8th Edition)
Chapter 6 Key, Spline and Pin
I. Key (键) connection
Square or rectangular key (平键) connection Woodruff Key (半圆键) connection Tapered rectangular key (平头楔键) connection Tapered gib-head key (钩头楔键) connection Tangential key (切向键) connection
III. Pinisassembly of the pins
Shaped connections
Elastic ring connection
1. (4) 2. (1) 3. (4)
Classwork

Problem 6-1 on page 115 (8th Edition)
1) Square or rectangular key
The top and bottom and the sides of the key are parallel. There are clearance between the top surface and the hub slots (轮毂槽), the sides are working faces, and the torque is transmitted by the sides of the key.