1. Core structure and working principle
1.1 Structural composition
Double Cross Shaft: Two cross shafts are connected in series through an intermediate shaft, with a phase difference of 90 ° installed to offset speed fluctuations.

Bearing system:

Needle roller bearings (high-speed type) or sliding bearings (heavy-duty type).

Self lubrication design (maintenance free) or grease lubrication (high load).

Connection method:

Flange type (ISO/DIN standard bolt holes).

Clamping type (keyless connection, suitable for precision shaft systems).

1.2 Transmission characteristics
Constant speed transmission conditions:

Install two cross axes with a 90 ° phase difference.

The angle between the input/output shaft and the intermediate shaft must be equal (α ₁=α ₂).

Angle compensation capability:

Single section deflection of 15 °~25 °, maximum double section series connection of 40 °~45 °.

Eliminating speed fluctuations: Compared to a single section cross shaft, the double section design can completely offset periodic speed fluctuations.

2. Key performance parameters
Parameter Standard Precision Enhanced Remarks
The shaft diameter range is 10-150mm 5-200mm (aviation grade), and non-standard customization can reach 300mm
Rated torque 50~20000Nm 10~50000Nm, instantaneous overload capacity 200%
Allowable speed 1000~5000rpm 3000~10000rpm Dynamic balance level G2.5/G1.0
Angle compensation double section maximum 45 ° double section maximum 50 ° (special design) single section recommended ≤ 25 °
Transmission accuracy: Backgap ≤ 0.1 ° Backgap ≤ 0.05 ° Laser alignment can reach ± 0.01mm
Material 42CrMo (quenched) titanium alloy/ceramic coating corrosion-resistant/high temperature (>300 ℃)
3. Core advantages
3.1 Compared to a single section cross axis
Completely eliminate speed fluctuations and achieve near constant speed transmission.

Greater angle compensation (double section 45 ° vs single section 25 °).

Higher load-bearing capacity: The intermediate shaft shares torque and reduces single section load.

3.2 Compared to ball cage couplings
Lower cost: suitable for high torque, medium low speed scenarios.

Easy maintenance: The cross shaft or bearing can be replaced separately.

Impact resistance: The heavy-duty design is suitable for mining and metallurgical equipment.

4. Typical application scenarios
Key points for selecting industry application cases
High precision (backlash<0.05 °) and dynamic balancing of the five axis linkage milling machine rotary table in machine tool manufacturing
Compact design of joint transmission for six axis robotic arm (outer diameter ≤ 100mm)
Titanium alloy material for aerospace aircraft servo drive (reduced weight by 30%)
Energy equipment, wind power variable pitch system, low temperature resistant lubricating grease (-40 ℃ working condition)
Special vehicle armored vehicle turret rotating mechanism dust seal+instantaneous overload protection