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Tribology Bearing Design

Bushing selection – Lubrication & Friction By viiplus.com, Mining machinery, Offer Bushings Match Customers’ Application.

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Mining Machinery

Excavator bearing

The installation and disassembly method of the excavator bearing should be determined according to the structure, size and matching nature of the excavator bearing parts. The pressure of installation and disassembly should be directly added to the end face of the tightly fitted excavator bearing ring, and the pressure can not be transferred through the rolling body of the excavator bearing, because it will cause indentation on the working surface of the excavator bearing, affect the normal work of the excavator bearing, and even damage the excavator bearing. The cage, sealing ring, dust cover and other parts of the excavator bearing are easy to deform. The pressure of installing or disassembling the excavator bearing can not be added to these parts. Excavator bearing installation: (1) the shift device is not adjusted properly. If the transmission of this type of excavator adopts the way of mechanical manual shift, the transmission lever, longitudinal shaft, horizontal shaft, and vertical fixing screw loosening can also cause the transmission “jump gear”. Variable speed transmission mechanism wear (2) sudden change of external load Due to the working nature of the excavator and the design of the machine itself, sudden change of external load will also lead to the transmission “jump gear”. When the road surface is uneven and the excavator is driving downhill or the driving route is improper, the external load suddenly changes. The sudden change of the load will act on the gear meshing gear of the gearbox through the wheel and the transmission shaft, so that the gear meshing is disconnected due to the axial thrust generated, resulting in the transmission “jump gear”. (3) The transmission mechanism of the gear shifting device of the excavator relies on the sliding gear sleeve to move axially on the fixed gear sleeve and meshing with the driven gears of each gear to realize the gear shifting. In the process of frequency shift, the end faces of the teeth of the above meshing gears are easily ground into a cone, which results in the decrease of their meshing performance and leads to “jump gear”. (4) to prevent “jump out” of the transmission, excavator in transmission Ⅱ, Ⅲ cover and Ⅳ Ⅴ fork shaft at the top of the box cover hole and Ⅰ, reverse gear fork are self-locking Ann has the function of steel ball and spring. When the spring that plays the role of positioning self-locking is weakened or broken, the self-locking performance of the self-locking mechanism will decline until it disappears, causing the transmission “jump gear”. At the same time, if the positioning ball or fork shaft groove wear, can also cause the transmission “jump gear”. (5) improper operation method Excavator driving on the ramp (especially downhill driving), if the operation is improper, will also lead to the transmission “jump gear”.


POM Composite Boundary lead-free self-lubricating bushing can be used for a long time without refueling under boundary lubrication conditions, and there are oil pits on the surface of the wear-resisting layer. The products are widely used in metallurgical machinery, mining machinery, water conservancy machinery, automobile, construction machinery, agricultural machinery, steel rolling industry, and so on.

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Bronze Wrapped Bearings with Through Holes
Bushing Design, Lubrication & Friction

Tribology Bearings Solution.

Tribology is the science of wear, friction &  lubrication. VIIPLUS develops tribologically optimized bushings materials based on tribological results. We combine this knowledge of material science and performance in order to offer plain bearings that match our customers’ application requirements.

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Tribology Bearings & Bushings

These self-lubricating bearing bushings products,
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The Study of Interacting Surfaces in Motion

• Markets: Construction, mining, metals, power generation, oils and gas,
aggregate, paper and forest products.
• Applications: Articulation joints, A-frames, cylinders (steering, lift, tilt, dump),
struts, traction bars.
• Features: Lubrication grooves and holes, graphite lubricant and
sliding bearings materials available.
• Benefits: Can carry radial and axial loads in a small envelope and can
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* An industry standard throughout the world.

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Mining is the extraction of valuable minerals or other geological materials from the earth from an orebody, lode, vein, seam, or reef, which forms the mineralized package of economic interest to the miner. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, dimension stone, rock salt, potash, gravel, and clay. Mining is required to obtain any material that cannot be grown through agricultural processes or created artificially in a laboratory or factory. Mining in a wider sense includes extraction of any non-renewable resource such as petroleum, natural gas, or even water. Mining of stone and metal has been done since pre-historic times. Modern mining processes involve prospecting for ore bodies, analysis of the profit potential of a proposed mine, extraction of the desired materials, and final reclamation of the land after the mine is closed. The nature of mining processes creates a potential negative impact on the environment both during the mining operations and for years after the mine is closed. This impact has led most of the world’s nations to adopt regulations designed to moderate the negative effects of mining operations. Safety has long been a concern as well, and modern practices have improved safety in mines significantly.

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Choose from our selection of composite bushing, wrapped bronze bushing, composite sleeve bushings, bimetal bushing in various designs and from different materials. available in metric sizes and inch sizes.

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