支重轮的主要结构及作用

The bulldozer 滚轮 is an important component of the undercarriage system in excavators and bulldozers. 其主要作用是支撑推土机、挖掘机的重量, 允许轨道沿着滚轮移动. 支重轮的主要部件包括轮体, 履带滚轮轴, 衬套, 密封圈, 端盖, 及其他相关结构件. 挖掘机 track rollers are generally painted black, 而推土机支重轮通常漆成黄色.

The track roller is fixed under the roller frame with screws to support the machine’s weight and distribute it across the track plates. It can transfer the weight of the locomotive set to the ground and roll on the track. To prevent derailment, it can also prevent lateral relative movement of the track. track rollers often work in mud, 水, ash, and sand, enduring strong impacts and extremely harsh working conditions, leading to easy wear of the wheel rim. 所以, the requirements for buttom rollers include wear resistance and reliable bearing seals.

Lower rollers can be divided into single-flange and double-flange types based on their structure. 例如, D65-8 track roller is double flange while EX120/PC50-7/ZX330 are single flanges. They employ both sliding bearings and rolling bearings. The rims of the track rollers/bottom rollers/lower rollers are hardened, with a hardness of 355-440HB. In the undercarriage, particularly when spacers are installed to increase rigidity, the resulting cavities can easily become clogged with dirt, obstructing the track rollers. Running on soaked soil can also easily clog the track rollers. 所以, some tracked bulldozers are equipped with track roller guards with reinforcing ribs on the outside of the undercarriage frame.