The single flange track roller (ang. single flange track roller) is an essential component of a tracked undercarriage system, widely used in construction machinery such as tracked excavators and other heavy vehicles operating in demanding terrain conditions. This roller plays a crucial role in ensuring the smooth movement of the machine and the even distribution of its weight on the tracks, which helps reduce component wear and minimize impact on the ground.
SINGLE FLANGE TRACK ROLLER 55Z 65R-1 8052 8055 ET58 ET65 EZ50 HR22 HR21 - FUNCTION AND STRUCTURE
The single flange track roller, unlike the double flange version, has only one flange whose task is to guide the track along a designated path. The flange placed on one side of the roller interacts with the inner side of the track links, keeping it on the correct route. The absence of a second flange means that the track roller is usually used in machines with lower loads or in working conditions where there are smaller lateral forces.
Key elements of the single flange roller design:
- Roller body – Made of high wear-resistant steel. Its purpose is to transfer the machine's mass and working forces.
- Flange (protrusion) – A single flange placed on one side of the roller, which keeps the track on the correct path. It protects the tracks from slipping off the roller.
- Bearing – The interior of the roller contains bearings that allow smooth rotation under load. The bearings are lubricated and often sealed, minimizing the need for maintenance.
- Seals – The rollers are equipped with special seals to prevent dirt, water, and contaminants from entering, which extends the component's lifespan.
Single flange rollers are primarily used in tracked machines of medium and smaller sizes, which do not experience as high lateral forces as, for example, bulldozers working on steep slopes. Examples of such applications include:
- Tracked excavators – Especially those working in medium terrain conditions, where guiding the track is more important than counteracting lateral forces.
- Mini excavators – Machines like 55Z, 65R-1, 8052, 8055, ET58, ET65, EZ50, HR22, and HR21, where the weight distributed on the undercarriage system is not as large, making single flange rollers sufficiently durable.
- Aggregate transport machines – Equipment that often moves in conditions where a lightweight undercarriage system and lower lateral loads are needed.
SINGLE FLANGE TRACK ROLLER 55Z 65R-1 8052 8055 ET58 ET65 EZ50 HR22 HR21
The roller shell is made of deeply hardened steel and designed to be resistant to vibrations. Hardening 50 – 58 HRC. Shafts and bearings are designed to reduce friction and wear and provide maximum durability. Lubricated for the entire service life to require minimal maintenance.
Modern single flange track rollers increasingly use advanced materials, such as high-strength alloys and modern protective coatings. Among the innovations, one can highlight:
- Surface hardening – This process increases strength and wear resistance, which is particularly important in conditions of intensive use.
- Multilayer seals – Modern sealing systems more effectively protect bearings from contaminants and moisture, resulting in longer component life.
Single flange track rollers 55Z 65R-1 8052 8055 ET58 ET65 EZ50 HR22 HR21 are a key element of the undercarriage system of these machines, especially in moderate terrain conditions. Due to their simpler design and lower operating costs, they are often chosen for machines exposed to smaller lateral loads. The selection of appropriate rollers for the machine should consider specific working conditions, load level, and type of terrain to ensure maximum efficiency and durability of the undercarriage.
