170-65-11211BUSH

Bulldozer liner is a cylindrical component that is fitted into a shaft or hole, usually made of metal, non-metal, or composite materials. By cooperating with the shaft or hole, it achieves sliding friction instead of direct metal contact, playing a role in reducing friction, wear resistance, buffering, and positioning.The core function of bulldozer lining1. Reduce friction and wear: The bushing is installed at the fitting part between the shaft and the hole (such as the hinge shaft and the bracket hole), and through the low friction coefficient of its own material (such as PTFE bushing friction coefficient of only 0.05-0.1), it reduces the direct contact wear between the two metal components and reduces power loss.2. Load bearing and buffering: During bulldozer operation, components such as the bulldozer shovel and soil loosening device will bear huge impact forces (such as pushing hard materials). The lining absorbs some of the impact loads through its own deformation or elasticity (such as rubber lining), protecting the base structure of the shaft and hole (avoiding deformation of the shaft neck or hole wall due to stress concentration).3. Positioning and guidance: The precise size of the liner (such as inner diameter tolerance H7) ensures the coaxiality of the shaft and hole, ensuring that the components move along a fixed trajectory during movement (such as blade lifting, soil loosening swing), avoiding offset or jamming.4. Sealing and dust prevention: Some bushings (such as rubber bushings with lips) can prevent external dust and mud from entering the fitting gap, while also preventing internal lubricating oil leakage and extending the lubrication cycle of the components.

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1. Connection parts of the working device
At the hinge shaft between the bulldozer blade and the frame: Install bronze or composite bushings to withstand the radial load during the lifting/lowering of the blade, reducing wear on the hinge shaft and frame holes.
The connecting shaft between the tooth tip of the soil loosening device and the bracket is made of high wear-resistant cast iron liner, which is suitable for high-frequency impact and sediment environment during soil loosening operation.

2. Components of the walking system
The connecting shaft between the track frame and the supporting wheels and guide wheels: uses a steel backed composite liner to withstand the continuous load and vibration of the track during walking, while reducing maintenance frequency through self-lubricating characteristics.
The fitting between the drive wheel hub and shaft: Install wear-resistant steel bushings to prevent excessive wear between the hub and shaft due to relative rotation.

3. Steering and braking system
Steering rod hinge point: Using rubber bushings, it not only reduces friction when the rod swings, but also buffers the impact force during steering through the elasticity of rubber, improving the smoothness of operation.
Brake pedal shaft sleeve: Made of nylon lining, it has self-lubricating properties, ensuring that the pedal is flexible and not stuck during frequent operation.

4. Engine and transmission system
The connection point between the engine bracket and the frame: Install shock-absorbing rubber bushings to reduce the transmission of engine vibration to the frame and reduce cabin noise.
Drive shaft universal joint fork shaft sleeve: Made of bronze lining, used in conjunction with lubricating grease to ensure stable transmission during high-speed rotation of the drive shaft.

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