German Bosch Rexroth shaft, Bosch Rexroth model, Bosch Rexroth price

The Bosch Rexroth shaft is a rotating body with high speed and few supports, so its dynamic balance is crucial. Generally, drive shafts undergo dynamic balance testing before leaving the factory and are adjusted on balancing machines. For front-engine, rear-wheel-drive vehicles, it is the shaft that transmits rotation from the transmission to the final drive; it can consist of several sections connected by universal joints.

Bosch Rexroth shaft applications

The drive shaft is an important component in the automotive drivetrain for transmitting power. Its function is to work with the gearbox and drive axle to transmit engine power to the wheels, generating driving force for the vehicle. Special vehicle drive shafts are mainly used in oil tankers, refueling trucks, water sprinklers, sewage suction trucks, fecal suction trucks, fire trucks, high-pressure cleaning trucks, road clearance vehicles, aerial work platforms, garbage trucks, and other vehicle types.

Bosch Rexroth shaft structural composition

The drive shaft consists of a shaft tube, a slip yoke (telescopic sleeve), and universal joints. The slip yoke automatically adjusts for changes in distance between the transmission and the drive axle. The universal joint ensures the change in angle between the axes of the transmission output shaft and the drive axle input shaft, achieving constant-velocity transmission between the two shafts. The universal joint is a key component on automotive drive shafts. A car is a moving object. In rear-wheel-drive cars, the engine, clutch, and transmission are installed as a unit on the frame, while the drive axle is connected to the frame via elastic suspension. There is a distance between them that requires connection. Uneven road surfaces cause bouncing during vehicle operation. Generally, a universal joint consists of a cross shaft (spider), cross bearings, and a yoke. The universal joint is a key component on automotive drive shafts. In front-engine, rear-wheel-drive vehicles, the universal joint drive shaft is installed between the transmission output shaft and the drive axle final drive input shaft; whereas front-engine, front-wheel-drive vehicles omit the drive shaft, with universal joints installed between the front axle half-shafts (which handle both drive and steering) and the wheels. During vehicle operation, uneven roads cause bouncing, load changes, or differences in assembly positions of the two assemblies, causing changes in the angle and distance between the transmission output shaft and the drive axle final drive input shaft. Therefore, a device that adapts to these changes is needed to solve this problem, hence the universal joint. [In front-engine, rear-wheel-drive (or all-wheel-drive) vehicles, due to suspension deformation during motion, there is often relative motion between the drive axle final drive input shaft and the transmission (or transfer case) output shaft. Additionally, to effectively bypass certain mechanisms or devices (where linear transmission is not possible), a device is required to achieve normal power transmission, leading to the emergence of universal joint transmission. Universal joint transmission must have the following characteristics: a, ensuring reliable power transmission when the relative position of the connected two shafts varies within the expected range; b, ensuring uniform rotation of the connected two shafts. Additional loads, vibrations, and noise generated due to the universal joint angle should be within allowable limits; c, high transmission efficiency, long service life, simple structure, easy manufacturing, and easy maintenance. For automobiles, since the output shaft of a single cross-type universal joint rotates at non-uniform speed relative to the input shaft (with a certain angle), double universal joints (or multi-universal joints) transmission must be adopted. The two universal joint yokes connected to the same drive shaft must be arranged in the same plane, and the angles of the two universal joints must be equal. This is very important. The angle of the universal joint should be minimized during design. Traditional drive shaft slip yokes weld the spline sleeve to the yoke and the spline shaft to the drive shaft tube. New-type drive shafts change the traditional structure by welding the spline sleeve and drive shaft tube into one unit, and making the spline shaft and yoke into one unit. Rectangular tooth splines are changed to large pressure angle involute short tooth splines, which increases strength and facilitates extrusion forming, adapting to high torque conditions. The tooth surfaces of the slip sleeve and spline shaft are coated with a layer of nylon material, which not only increases wear resistance and self-lubrication but also reduces damage to the drive shaft from impact loads, improving buffering capacity. This type of drive shaft adds a tubular sealing protective sleeve outside the flange spline shaft. Two polyurethane rubber oil seals are set at the end of the protective sleeve, forming a completely sealed space inside the slip yoke. This prevents the slip spline shaft from erosion by external dust and sand, providing both dustproof and rust-proof protection. Therefore, lubricating grease is applied once between the spline shaft and the sleeve during assembly, fully meeting usage requirements without the need for grease nipple lubrication, reducing maintenance content. Bushings are designed to reduce friction and wear during shaft movement. Their basic use is similar to bearings, and they are relatively cheaper, but have higher friction resistance, so they are only used on some components. Most bushings are made of copper, but plastic bushings also exist. Bushings are mostly placed between the shaft and the support structure, fitting very tightly against the support structure, allowing only the shaft to rotate on the bushing. Lubricant is added between the shaft and bushing during assembly to reduce friction generated during rotation.

Bosch Rexroth shaft fault maintenance

Damage, wear, deformation, and loss of dynamic balance of drive shaft components will cause abnormal noise and vibration during vehicle driving, and in severe cases, lead to damage of related components. During driving, if a clunking sound occurs when starting or accelerating rapidly, and there is an obvious feeling of loose components, if it is not looseness of the drive axle transmission gears, it is clearly looseness of the drive shaft components. The loose parts are invariably the universal joint cross bearings or the steel cup and yoke, and the spline shaft and spline sleeve of the slip yoke. Generally, the clearance between the cross shaft diameter and the bearing should not exceed 0.13mm, and the meshing clearance between the slip spline shaft and spline sleeve should not be greater than 0.3mm. If usage limits are exceeded, repair or replacement is necessary. If a humming sound occurs from the chassis during driving, and the sound increases with speed, this is generally due to wear and looseness of the universal joint cross shaft and bearings, wear of the drive shaft center bearing, damage to the intermediate rubber support or loosening of the hanger bracket, or incorrect positioning of the hanger bracket fixation. 1) Traditional methods: In China, common methods for addressing drive shaft wear include build-up welding, inserting bushings, and knurling. However, when the shaft material is 45 steel (quenched and tempered), using only build-up welding generates welding internal stresses, which may cause cracks or even fracture at the shaft shoulder under heavy loads or high-speed operation. Stress relief annealing is difficult to operate, has a long processing cycle, and high maintenance costs. When the shaft material is HT200, cast iron welding is also not ideal. Some enterprises with higher maintenance technical capabilities adopt electro-brush plating, laser welding, micro-arc welding, or even cold welding. These maintenance technologies often require high standards and incur high costs. 2) Latest maintenance methods: For the above repair technologies, they are less common in European, American, Japanese, and Korean enterprises. Developed countries generally adopt polymer composite material technology and nanotechnology. Polymer technology allows on-site operation, effectively improving maintenance efficiency, and reducing maintenance costs and intensity. The most widely applied is the Meijiahua technology system. Compared with traditional technology, polymer composite materials possess the strength and hardness required of metals, as well as compliance (variable relationship) that metals do not have. Through processes such as mold repair, component correspondence, and mechanical machining, dimensional fit between the repaired area and mating components can be ensured to the maximum extent. Meanwhile, utilizing the comprehensive advantages of the composite material itself, such as compressive resistance, bending resistance, and elongation rate, it can effectively absorb external impact forces, greatly dissipate and offset the radial impact force of the bearing on the shaft, and avoid the possibility of gaps, thereby avoiding secondary wear caused by increased gaps in equipment.

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