A shaft is a shaft that must be used to link the main parts of the product and is used to bear both bending moments and torques during rotating work. It can keep the moving parts at a fixed angle and connect the assembly parts, such as the notebook shaft - open the notebook screen, you can easily adjusted to the appropriate position. Let's take a look at the structure design and classification of the rotating shaft.

1. Shaft structure - nut damping structure

The advantages of the shaft design of the nut damping structure are adjustable torque, stable life, product diversification, high production yield, but large assembly space, multiple manufacturing processes, low efficiency, and high cost. Common shafts include display shafts, cash register shafts, etc.

1. Active frame - assembly relationship with the movable parts of the shell or participate in friction

2. Fixing frame - assembling relationship with housing fixing parts or participating in friction

3. Connecting shaft - the pivot to connect the fixed frame and the movable frame

4. Spring washer - after compression, a pressing force is generated, and a torsion force is generated

5. Limit spacer - angle limit

6. Oil storage gasket - lubrication, friction creates resistance

7. Nuts - lock fasteners and prevent loosening

2. Shaft structure - pop-up structure

The design of the pop-up structure hinge This structure product is suitable for pop-up needs, and there is no damping and pause function during the flipping process.

1. Connecting shaft - assembly connection, the main material is 1125 easy-cut iron

2/3. Concave and concave gears - angle setting, frictional resistance, main materials POM, MIM

4. Spring-torsion generation, the main material is SWP-B piano steel wire

5. The ferrule - the assembly relationship with the shell, the main material is CU, SUS

6. Buckle - to prevent the internal structure from falling off, the main material is SK7

3. Shaft structure - wrapped damping structure

The design advantages of the wrapped damping structure shaft are small assembly space, simple assembly, low cost, etc., but the process is unstable, the function is single, and the life is poor. It is often used in electronic product bracket shafts, etc.

1. Rotary sleeve - assembly relationship with the shell, torsion generated by friction with the shaft, the main material is SK7 high carbon steel

2. Connecting shaft - assembly relationship with the shell, friction with the ferrule to generate torque, the main material is 1125

three,

4. General requirements and parameters of shaft design

Require:

Hand feel - the damping is well-proportioned during the rotation, and the strength can be adjusted according to different weight products

Lifetime - 10,000 to 100,000 times of use can be achieved according to different materials and structures

Function - Diversified design of terminal products, any combination of products such as flipping and rotating

parameter:

Torque-weight 0.5kg*torque 10cm*30% loss, experience value≈6.5kgf.cm

Preload angle - there is a certain preload after closing or opening, and it is not easy to lift

Limit angle - rotation lock angle

Service life - 100,000 times for mobile phones, 50,000 times for notebooks, 10,000 to 50,000 times for conventional types

What is torsion force, also called damping force, this is an industry name, the academic name is "torque"; the formula for calculating the torque of the rotating shaft: torque = force * force arm; the international unit is NM (Nm); and torque is torque, torque The unit is usually "Kgf.cm"; conversion formula: 1NM=9.8kgf.cm.