Filter Elements 3261643 Hydraul Oil

Basis for selecting the connection method of the disk hub

The selection of the hub (shaft hub) connection method should take into account core factors such as load characteristics, precision requirements, space limitations, and maintenance costs. The specific basis is as follows:

I. ‌ Load intensity and type ‌

Heavy torque scenario ‌

Spline connection ‌ : suitable for high torque transmission (such as new energy agricultural machinery drive shafts), involute splines have excellent tooth profile centering ability, small stress concentration, and support hub movement ‌.

Tangential key ‌ : It can transmit a large torque but significantly weakens the shaft. It is mostly used for heavy machinery shafts with a diameter greater than 100mm (such as mining truck hubs) ‌.

Light to medium load scenario ‌

Flat key ‌ : Simple and reliable structure, low cost, suitable for light-load connections with low centering requirements (such as auxiliary transmission components of agricultural machinery) ‌.

Expansion sleeve (elastic ring) ‌ : keyless connection, easy to install and disassemble, suitable for maintenance scenarios that require frequent disassembly ‌.

Ii. Centering Accuracy and Stability of ‌ ‌

High-precision positioning requirements ‌

Rectangular splines (small diameter centering) ‌ : centering accuracy up to ±0.01mm, suitable for high-speed precision machinery (such as hub motor input shafts) ‌.

The interference fit of the conical surface ‌ : good centering, uniform force transmission, but high processing accuracy requirements ‌.

Slightly eccentric scenarios are allowed ‌

Wedge key ‌ : It can withstand unidirectional axial force, but it is prone to cause hub eccentricity after assembly. It is only used in low-speed equipment ‌.

Iii. Spatial adaptability of ‌ to working conditions ‌

Compact space limitation ‌

Semi-circular key ‌ : Shallow groove depth, less weakening of the shaft, suitable for light-load connections with smaller shaft diameters (such as small motor hubs) ‌.

Axial flux motor integration ‌ : The hub adopts spline direct connection, reducing the axial dimension by 50%, suitable for new energy agricultural machinery with limited chassis space ‌.

Dynamic and complex conditions ‌

Involute spline (30° pressure Angle) ‌ : High root strength and strong impact resistance, suitable for the wheel hubs of construction machinery that frequently start and stop ‌.

Interference fit ‌ : No keyway stress concentration, but difficult to disassemble and assemble, requires the use of hydraulic tools, suitable for long-term maintenance-free scenarios ‌.

Iv. Economic Efficiency of ‌ and maintenance costs ‌

Low cost first ‌

Flat key/semi-circular key ‌ : easy to process, low mass production cost, widely used in standardized agricultural machinery parts ‌.

Long service life and low maintenance requirements ‌

Spline ‌ : Better wear resistance than key connection, service life is extended by more than 30%, and downtime loss is reduced ‌.

Expansion sleeve ‌ : no relative motion wear, long maintenance cycle, but relatively high manufacturing cost ‌.

V. Special Environmental adaptability of ‌ ‌

Sealing and anti-corrosion requirements ‌ : Hub motors adopt interference fit connection + resin coating to enhance the waterproof and dustproof grade (IP67) ‌.

High-frequency vibration scenarios ‌ : spline + vibration damping spring combination to suppress transmission shock (such as electric vehicle wheel hubs) ‌.

Typical selection comparison table ‌

Alternative options for the preferred connection method of the scene

Heavy-duty torque (>1000Nm) involute spline (30°) tangential key

High-precision centering rectangular splines (small path centering) conical surface interference

Frequently disassemble and assemble the set screws of the expansion sleeve

Light-load, low-cost flat key semi-circular key

When making a selection, it is necessary to balance the ‌ load limit ‌, ‌ precision tolerance ‌ and ‌ full-cycle cost ‌. In the new energy field, spline/interference fit connections are preferred to match the high torque output requirements of high-power density motors ‌.