Excavator Track Idler Bushing
The excavator track idler bushing is a crucial component in the undercarriage system of an excavator. It plays a vital role in supporting and guiding the movement of the excavator's tracks, ensuring smooth and reliable operation.
Constructed from durable materials such as cast iron or steel, the excavator track idler bushing is designed to withstand the heavy loads and rigorous operating conditions encountered in excavator work. Its robust design ensures it can handle the constant abrasion and impact from the moving tracks.
The excavator track idler bushing is mounted on the idler wheel, which rotates to guide the tracks around the excavator's frame. As the excavator moves, the tracks roll over the idler wheels, and the bushings provide a smooth and consistent surface for the tracks to move on.
Over time, the excavator track idler bushings may wear down due to abrasion and impact. Regular inspection and replacement of worn bushings are essential to maintain the excavator's undercarriage system in good working order.
In summary, the excavator track idler bushing is an important component that supports and guides the excavator's tracks, ensuring smooth and reliable operation. Its robust design and durability make it a crucial part of the excavator's undercarriage system.
Track idler Bushing, Bushing Supplier ...
Excavator Track Idler Bushing ...
HYDRAULIC EXCAVATOR BUSHINGS
BIMETAL BUSHING WITH COPPER PLATE
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720 is a bimetal bearing with steel back and sintered CuPb24Sn4 as lining. This type has fairly good performance in anti-fatigue and heavy load capacity. It is suitable for middle-speed and middle load. When the soft alloy is plated on the bushing surface and with oil lubrication, it can be applied in the high-speed internal combustion engine and connect-rod.
| Lead bronze alloy | CuPb24Sn4 | Temperature Max | 170℃ |
| Load capacity | 38N/mm² | Harderness alloy | HB45~70 |
CuPb24Sn4 bimetallic bearing bushes
Structure
- Steel Backing and Bronze Alloy Overlay
Composition
- Steel + CuPb24Sn4 bronze alloy
Bimetal Bearing 720 Technical Data
| Max. sliding speed V(m/s) | 2.5 m/s | |
| Max. PV factor (N/mm2.m/s) | 2.8 N/mm2.m/s | |
| Operating Temperature | Max. Greased | 150°C |
| Max. Oil lubricated | 250°C | |
| Coefficient of friction | Greased | 0.05~0.12μ |
| Oiled | 0.04~0.12μ | |
| Surface roughness (Ra) | ≤0.8 µm | |
| Alloy Layer Hardness (HB) | 45-70 | |
| Coeff. Of linear expansion | 18x10-6/K | |
Bimetal Bearing Characteristics
- Particularly suitable for high specific loads with oscillating movement and low frequency.
- Applicable in difficult operating conditions
- High load capacity, very good resistance to fatigue at high temperatures.
Typical Application
CuPb24Sn4 bimetallic gearbox bushes 720 is widely used in High speed, heavy load engine main shaft and transmission gearbox etc.
The designing of oil indentations | ||||||
| In order to fully lubricate the bush when in the performance, the indentations with size as follow are recommended. They should be manufactured according to the standard below if without special requirements. | ||||||
| Bush O.D | More than to | 14~22 | 22~44 | 40~50 | 50~100 | 100~180 |
| Lubricating hole | 3 | 3 | 3 | 6 | 7 | |
| The lubricating hole should be away from butt joint and loading area and designed to be easy-oil-feding as well. | ||||||
Normal thickness of the JF bimetal and their tolerances | ||||||||
| Tolerance Thickness | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 5 |
| Thickness of steel backing | 0.6 | 1 | 1.4 | 1.9 | 2.3 | 2.8 | 3.2 | 4 |
| Thickness of bronze leyer | 0.4 | 0.5 | 0.6 | 0.6 | 0.7 | 0.7 | 0.8 | 1.0 |
| Manufactuable wall thickness | 1+0.25 +0.15 | 1.5+0.25 +0.15 | 2+0.25 +0.15 | 2.5+0.25 +0.15 | 3+0.25 +0.15 | 3.5+0.25 +0.15 | 4+0.25 +0.15 | 4+0.25 +0.15 |
| Manufactued wall thickness | 1-0.025 | 1.5-0.03 | 2-0.035 | 2.5-0.04 | 3-0.045 | 3.5-0.05 | 4-0.055 | 4-0.06 |
JF Bimetel Bushing chemical composition | ||||
| Tolerance Thickness | JF-800 | JF-720 | JF-700 | JF-20 |
| Cu | Remainder | Remainder | Remainder | 0.7~1.3 |
| Pb | 9.0~11.0 | 21.0~27.0 | 26.0~33.0 | - |
| Sn | 9.0~11.0 | 3.0~4.5 | 0.5 | 17.5~22.5 |
| Zn | 0.5 | 0.5 | 0.5 | - |
| P | 0.1 | 0.1 | 0.1 | |
| Fe | 0.7 | 0.7 | 0.7 | 0.7 |
| Ni | 0.5 | 0.5 | 0.5 | 0.1 |
| Sb | 0.2 | 0.2 | 0.2 | - |
| Ai | - | - | - | Remainder |
| Si | - | - | - | 0.7 |
| Mn | - | - | - | 0.7 |
| Ti | - | - | - | 0.2 |
| Other | 0.5 | 0.5 | 0.5 | 0.5 |
JF Bimetel Bushing Physical properties | |||||
| Physical properties | JF-800 | JF-720 | JF-700 | JF-20 | |
| Max. static load pressure N/mm2 | 150 | 130 | 120 | 100 | |
| Tensile strength N/mm2 | 150 | 150 | 200 | 200 | |
| Max. speed(oil) m/s | 5 | 10 | 15 | 25 | |
| Friction coef(Oill) | 0.06~0.14 | 0.06~0.16 | 0.08~0.16 | 0.08~0.17 | |
| PV limit N/mm2 m/s | Grease | 2.8 | 2.8 | 2.5 | - |
| Oil | 10 | 10 | 8 | 6 | |
| “Sapphire Fatigue Calss Mpa | 125 | 115 | 105 | 85 | |
Application
Widely used in metallurgical equipment, instrumentation and mining machinery, ship machinery.
47*40*30
54*47*35
57*50*35
67*60*35
72*65*40
110*102*100
125*115*78
135*125*83
110*100*90
110*102*100
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