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Volvo EW145B/MX130 Wheeled Excavators High-Wear Parts for Chassis Drivetrain and Braking Systems
Wheel-End Reduction and Drive Axle System
When engine power is transmitted through the gearbox to the front and rear axles, the following components facilitate the final stage of speed reduction and torque multiplication at the wheel end:
1. EW145B Planetary Carrier Assembly: Located at the core of the wheel-end reduction unit, this component houses several planetary gears. It receives high-speed input from the differential and axle shafts, distributing it evenly and converting it into the massive torque required to drive wheel rotation.
2. EW145B Ring Gear: Featuring precision-machined internal teeth (typically fixed to the wheel hub or axle housing end), this component meshes internally with the planetary gears to form the reduction gear set.
3. EW145B Bracket: Refers generally to components such as wheel-end suspension brackets, steering knuckle kingpin brackets, or mounting mounts at the ends of the axle housing; these serve to securely connect the axle tube to the wheel-end drive assembly.
Axle and Final Drive System (Power Transmission)
1. EW145B Front Axle Shaft: Since the front axle of a wheeled excavator incorporates a steering function, the front axle shaft is typically equipped with a universal joint (cross-shaft structure) to facilitate power transmission while the machine is steering.
2. Rear Axle Shaft: Primarily responsible for direct drive transmission, transferring power from the central differential to the wheel ends on both the left and right sides.
3. EW145B Ring & Pinion Gear Set (Main/Secondary Drive Gears): This refers to the core spiral bevel gear pair located within the final drive assembly (often called the "pumpkin" or differential housing). It consists of a pinion gear (drive gear connected to the driveshaft) and a ring gear (driven gear connected to the differential housing), serving to redirect the longitudinal rotational power from the driveshaft by 90 degrees into transverse driving force.
Braking System (Operational Safety)
EW145B Brake Master Cylinder/Wheel Cylinder: Wheeled excavators typically employ either an air-over-hydraulic (pneumatic-hydraulic) or a fully hydraulic braking system. The brake cylinder converts the mechanical force applied by the operator to the brake pedal into high-pressure brake fluid, which engages the wet multi-disc brake packs within the chassis, allowing the massive excavator to decelerate rapidly or come to a secure, stationary halt.
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