Understanding Bimetal Plain Bearings: Superior Solutions for High Load and Rough Operating Conditions
Maintenance-free Plain Bearings
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Bimetal-bearing is a bimetal bearing, wrapped of steel sheets with a layer of lead bronze- Sleeve & Flange More
In industries where machinery faces high loads and rough operating conditions, choosing the right bearings is crucial for optimal performance and durability. Bimetal plain bearings, with their robust construction and excellent wear resistance, stand out as an ideal solution. In this blog post, we’ll explore the benefits of bimetallic bearings, particularly those with a steel backing and layers of CuPb10Sn10 or CuSn6Zn6Pb3, and why they are preferred in challenging industrial environments.
What are Bimetal Plain Bearings?
Bimetal plain bearings consist of two distinct metal layers: a strong steel backing and a softer bearing material layer. This construction allows for a combination of durability and performance that single metal bearings cannot match. The steel backing provides high structural integrity and load-bearing capacity, while the softer metal layer offers reduced friction and good conformity to the mating shaft.
Standard sizes of these bearings feature lubrication indents on the running surface. Typically, the steel backing of standard bearings is copper-plated to enhance corrosion resistance. The lead bronze layer allows for extended lubrication intervals.
Bimetal bearings can be produced with a thicker lead bronze layer for scenarios requiring machining post-installation. Additionally, the material of this layer can be customized to meet the specific requirements of the application.
Metal Bushings: Bronze Steel Bushing, Key Features of Bimetallic Bearings
High Load Capacity: The steel backing of bimetal bearings enables them to withstand higher loads compared to other bearing types. This makes them suitable for applications such as heavy machinery and automotive engines where operational demands are intense.
Enhanced Wear Resistance: The bearing layer, typically made from materials like CuPb10Sn10 or CuSn6Zn6Pb3, is designed to offer superior wear resistance. These materials have excellent properties for applications involving oscillation and frequent starts and stops, providing a longer bearing life.
Tolerance to Rough Conditions: Bimetal bearings can endure harsh operating environments, including high temperatures and exposure to dirt and debris. Their robust construction helps maintain performance even when conditions are far from ideal.
Versatility: These bearings are used in a wide range of applications, from automotive to heavy industrial equipment. Their ability to be customized in terms of size and material properties makes them a versatile choice for many sectors.
Applications of Bimetal Plain Bearings
The bimetal bushing consists of a bronze layer, steel backing, and is finished with either copper plating or a phosphate coating.
Bimetal plain bearings are widely used in applications that require durability and reliability under high loads and rough conditions. Some common applications include:
Automotive: Connecting rods, rocker arms, and transmission systems.
Industrial: Pumps, compressors, and hydraulic systems.
Agricultural Equipment: Tractors and harvesters that require reliable operation under varying and sometimes extreme conditions.
Bi-Metal Bushing – Bushing Series (Metric)，Choosing the Right Material Layer
The choice of material for the bearing layer significantly affects the bearing’s performance. Copper plated steel backing, lead bronze layer (CuPb10Sn10). Here are two popular choices:
- CuPb10Sn10: Known for its excellent conformability and fatigue strength, this material is ideal for high-speed applications where both load and temperature can vary widely.
- CuSn6Zn6Pb3: This material offers good corrosion resistance and compatibility, suitable for environments where there may be exposure to corrosive elements.
Browse The Bimetal Plain Bearings Bushing
Bimetal plain bearings with steel backing are a preferred choice for applications that demand high load capacity and durability under rough operating conditions. With their excellent wear resistance and ability to handle a variety of environmental challenges, these bearings provide a reliable solution in many industrial and automotive applications. When selecting a bearing, considering the specific operational requirements and environmental conditions will guide you in choosing the right bimetal bearing composition, ensuring performance, longevity, and cost-efficiency.
JF800 Bimetal Self-Lubricating Bearings — High-Performance Wear-Resistant Solution
Product Overview
The JF800 bimetal bearing features a low-carbon steel backing with a sintered copper alloy surface, such as CuPb10Sn10 or CuSn6Zn6Pb3, delivering superior self-lubricating performance. Known for its high load capacity, excellent wear resistance, and fatigue strength, JF800 bearings are widely used in automotive, construction machinery, agricultural equipment, and industrial machinery under medium-speed and high-impact load conditions.
Key Applications
1. Automotive Industry
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Balance Shaft Bushings: For suspension systems, capable of withstanding high loads and vibrations.
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Steel Pin Bushings: Connects suspension to chassis, providing stability and wear resistance.
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Steering Knuckle Bushings: Supports steering components under impact and friction.
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Connecting Rod Bushings: Designed for high-speed rotation and heavy loads in engines.
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Valve Rocker Arm Bushings: Reduces friction and wear in engine valve systems.
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Camshaft Bushings: Ensures smooth rotation of camshafts.
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Differential Bushings: Handles complex load and rotational motion in differential gears.
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Transmission Bushings: Supports gear shafts while minimizing friction.
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Main Bearings for Internal Combustion Engines: Supports crankshafts under heavy load and high speed.
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Thrust Washers: Controls axial movement and reduces wear.
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Piston Pump and Gear Pump Side Plates: Provides low-friction support in hydraulic systems.
2. Construction Machinery
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Crawler Chassis Track Rollers: Used in excavators, bulldozers, and other heavy-duty tracked vehicles.
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Idler and Tension Wheels: Maintains track tension and stability.
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Bulldozer Drive Wheels: Adapts to low-speed, high-load operations.
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Hydraulic Cylinders: Provides wear-resistant support for hydraulic systems.
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Lifting Equipment: Supports frequent movement and heavy loads in cranes and material handling machinery.
3. Agricultural Machinery
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Tractor and Harvester Bushings: Designed for harsh outdoor conditions and high loads.
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Agricultural Steering System Bushings: Ensures reliable steering support.
4. Other Industrial Applications
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Textile Machinery: Reduces wear in high-speed rotating parts.
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Pneumatic Equipment: Ideal for medium-speed and high-impact components.
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Food Processing Machines: Provides durable support in low-speed lubrication points.
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Home Appliances: Reduces friction and noise in washing machines, air conditioners, etc.
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Hydropower and Injection Molding Machines: Handles high temperature and heavy load applications.
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Tire Molds and Wind Turbine Rotor Locks: Resistant to high temperatures and pressures.
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Marine and Offshore Equipment: Offers corrosion and wear resistance in marine environments.
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Steel Mills and Steam/Gas Turbines: Suitable for extreme heavy-duty conditions.
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Compressors: Supports high-speed, heavy-load rotating components.
Key Features and Operating Conditions
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Lubrication: The bearing surface can be customized with oil grooves, oil holes, or lubrication dimples, suitable for self-lubrication or periodic lubrication. Ideal for applications where continuous lubrication is difficult or in harsh conditions.
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Load & Speed: Suitable for medium-speed, high-impact loads or low-speed, heavy-load scenarios. Static load capacity up to 150 N/mm², maximum oil-lubricated linear speed up to 5 m/s.
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Wear Resistance: Copper alloy layers like CuPb10Sn10 provide excellent wear and fatigue resistance, suitable for high-temperature and demanding environments.
Selection Recommendations
When selecting JF800 bimetal bearings, consider load, speed, temperature, and lubrication conditions for your specific application. Consult professional suppliers or manufacturers such as VIIPLUS or Bronzelube for technical guidance and custom design solutions to ensure optimal performance.
For detailed technical specifications or custom solutions, provide your specific application requirements.
The lead-free bi-metal bushing offers a high load capacity and excellent resistance to fatigue from dynamic or impact loads. It performs exceptionally well in oscillating conditions and is suitable for use in confined spaces.
This bushing features a bronze layer, steel backing, and either copper plating or phosphate coating. It is available in cylindrical, flanged, and thrust configurations.
Typical applications for this bi-metal bushing include axles, steering systems, and equipment used in material handling, agriculture, and construction.
In the production process of bimetallic bearing materials, in order to remove impurities such as phosphorus (P) and improve material properties, specific fluxes and processes can be used. For example, graphite and copper-phosphorus alloys (copper-phosphorus) can be used to improve the material’s self-lubricating properties and reduce wear. During the sintering process, impurities such as phosphorus can be removed by adding specific fluxes, usually containing fluoride or chloride, which are able to react with phosphorus to form a slag that is removed during the smelting process.
In actual production, other materials and processes may also be used to optimize the performance of bimetallic bearings, including the use of a combination of copper-based alloys and graphite, and the bonding of molybdenum disulfide (MoS2) and graphite to the copper matrix through chemical coating technology. These technologies can help improve bearing capacity, wear resistance and anti-bonding properties.
In some cases, in order to improve the performance of bimetallic bearing materials, elements such as nickel, tin, and bismuth may be added to copper-based alloys, and bimetallic bearing materials with anti-friction layers may be prepared through specific sintering and rolling processes. The choice of these materials and processes depends on the desired application and performance requirements.
In general, the production of bimetallic bearing materials is a complex process, involving multiple steps such as material selection, melting, sintering, rolling and post-treatment. By optimizing these steps, bimetallic bearing materials with excellent properties can be produced.
| Alloy | Pb (%) | Fe (%) | Ni (%) | Zn (%) | Cu (%) | Additional Properties |
|---|---|---|---|---|---|---|
| CuPb10Sn | 8.0-11.0 | ≤0.25 | ≤1.5 | ≤2.0 | 78.0-87.0 | Tensile strength ≥220 MPa; Yield strength ≥140 MPa; Elongation ≥5%; Hardness ≥70HBW (reference) |
| CuPb30 | 27.0-33.0 | ≤0.5 | ≤0.08 | ≤0.3 | 62.5-72.5 | – |
| CuPb24Sn4 | 19-27 | 3-5 | ≤0.08 | ≤0.3 | 67-77 | Hardness 45-80HBW |
| CuSn6Zn6Pb3 | 2-4 | 5-7 | 5-7 | ≤1 | 82-88 | Ultimate dynamic load 60N/mm2; Friction coefficient <0.15; Hardness ≥80-100HBW |
| AISn20Cu | – | Rest | 17.5-22.5 | 0.7-1.3 | ≤0.4 | Other magazines ≤0.5%; Hardness ≥34-36HBS |
| CuSn6.5P0.1 | Rest | 6-7 | 0.1-0.25 | ≤0.5 | – | Hardness 60-90HBW |
|
d
|
D
|
( h8)
|
(H7)
|
H7
|
Wall thickness
|
f1
|
f2
|
L 0
-0.40 |
|||||||||
|
min
|
max
|
10
|
15
|
20
|
25
|
30
|
40
|
50
|
60
|
||||||||
|
10
|
12
|
10-0.022
|
12+0.018
|
+0.148
+0.010 |
0.995
|
0.935
|
4
|
0.5
|
0.3
|
1010
|
1015
|
1020
|
|
|
|
|
|
|
12
|
14
|
12-0.027
|
14+0.018
|
1210
|
1215
|
1220
|
|
|
|
|
|
||||||
|
14
|
16
|
14-0.027
|
16+0.018
|
1410
|
1415
|
1420
|
|
|
|
|
|
||||||
|
15
|
17
|
15-0.027
|
17+0.018
|
1510
|
1515
|
1520
|
|
|
|
|
|
||||||
|
16
|
18
|
16-0.027
|
18+0.018
|
0.8
|
0.4
|
1610
|
1615
|
1620
|
|
|
|
|
|
||||
|
18
|
20
|
18-0.027
|
20+0.021
|
+0.151
+0.010 |
1810
|
1815
|
1820
|
1820
|
|
|
|
|
|||||
|
20
|
23
|
20-0.033
|
23+0.021
|
+0.181
+0.020 |
1.490
|
1.430
|
2010
|
2015
|
2020
|
2020
|
|
|
|
|
|||
|
22
|
25
|
22-0.033
|
25+0.021
|
6
|
2210
|
2215
|
2220
|
2220
|
|
|
|
|
|||||
|
24
|
27
|
24-0.033
|
27+0.021
|
1.0
|
0.5
|
2410
|
2415
|
2420
|
2420
|
2430
|
|
|
|
||||
|
25
|
28
|
25-0.033
|
28+0.021
|
|
2515
|
2520
|
2520
|
2530
|
|
|
|
||||||
|
26
|
30
|
26-0.033
|
30+0.021
|
+0.205
+0.030 |
1.980
|
1.920
|
|
2615
|
2620
|
2620
|
2630
|
|
|
|
|||
|
28
|
32
|
28-0.033
|
32+0.025
|
|
2815
|
2820
|
2820
|
2830
|
2840
|
|
|
||||||
|
30
|
34
|
30-0.033
|
34+0.025
|
1.2
|
0.6
|
|
3015
|
3020
|
3020
|
3030
|
3040
|
|
|
||||
|
32
|
36
|
32-0.039
|
36+0.025
|
|
3215
|
3220
|
3220
|
3230
|
3240
|
|
|
||||||
|
35
|
39
|
35-0.039
|
39+0.025
|
|
|
3520
|
3520
|
3530
|
3540
|
3550
|
|
||||||
|
38
|
42
|
38-0.039
|
42+0.025
|
8
|
|
|
3820
|
3820
|
3830
|
3840
|
3850
|
|
|||||
|
40
|
44
|
40-0.039
|
44+0.025
|
|
|
4020
|
4020
|
4030
|
4040
|
4050
|
|
||||||
|
d
|
D
|
（h8）
|
（H7）
|
Wall thickness
|
f1
|
f2
|
L 0
-0.40 |
||||||||||
|
min
|
max
|
25
|
30
|
40
|
50
|
60
|
80
|
90
|
100
|
||||||||
|
45
|
50
|
45-0.039
|
50+0.025
|
+0.205
+0.030 |
2.460
|
2.400 |
8
|
1.5
|
1.0
|
4525
|
4530
|
4540
|
4550
|
|
|
|
|
|
50
|
55
|
50-0.039
|
55+0.030
|
+0.210
+0.030 |
|
5030
|
5040
|
5050
|
5060
|
|
|
|
|||||
|
55
|
60
|
55-0.046
|
60+0.030
|
|
5530
|
5540
|
5550
|
5560
|
|
|
|
||||||
|
60
|
65
|
60-0.046
|
65+0.030
|
|
6030
|
6040
|
6050
|
6060
|
|
|
|
||||||
|
65
|
70
|
65-0.046
|
70+0.030
|
|
6530
|
6540
|
6550
|
6560
|
|
|
|
||||||
|
70
|
75
|
70-0.046
|
75+0.030
|
|
7030
|
7040
|
7050
|
7060
|
7080
|
|
|
||||||
|
75
|
80
|
75-0.046
|
80+0.030
|
9.5
|
|
7530
|
7540
|
7550
|
7560
|
|
|
|
|||||
|
80
|
85
|
80-0.046
|
85+0.035
|
+0.215
+0.030 |
|
|
8040
|
8050
|
8060
|
8080
|
|
|
|||||
|
85
|
90
|
85-0.054
|
90+0.035
|
|
8530
|
|
8550
|
8560
|
8580
|
|
85100
|
||||||
|
90
|
95
|
90-0.054
|
95+0.035
|
|
|
|
9050
|
9060
|
9080
|
|
90100
|
||||||
|
95
|
100
|
95-0.054
|
100+0.035
|
|
|
|
|
9060
|
9080
|
9090
|
90100
|
||||||
|
100
|
105
|
100-0.054
|
105+0.035
|
|
|
|
|
10060
|
10080
|
10090
|
100100
|
||||||
|
105
|
110
|
105-0.054
|
110+0.035
|
|
|
|
|
10560
|
10580
|
|
105100
|
||||||
|
110
|
115
|
110-0.054
|
115+0.035
|
|
|
|
|
11060
|
11080
|
|
110100
|
||||||
|
115
|
120
|
115-0.054
|
120+0.035
|
|
|
|
11550
|
|
11580
|
|
|
||||||
|
120
|
125
|
120-0.054
|
125+0.040
|
+0.220
+0.030 |
|
|
|
12050
|
12060
|
|
|
120100
|
|||||
|
125
|
130
|
125-0.063
|
130+0.040
|
|
|
|
|
|
|
|
125100
|
||||||
|
130
|
135
|
130-0.063
|
135+0.040
|
|
|
|
|
13060
|
|
|
130100
|
||||||
|
135
|
140
|
135-0.063
|
140+0.040
|
|
|
|
|
13560
|
13580
|
|
|
||||||
|
140
|
145
|
140-0.063
|
145+0.040
|
|
|
|
|
14060
|
14080
|
|
140100
|
||||||
|
150
|
155
|
150-0.063
|
155+0.040
|
|
|
|
|
15060
|
15080
|
|
150100
|
||||||
bimetallic bearings with steel backing are ideal for applications with high loads & rough operating conditions. Wear resistance.
Metal/polymer composite plain bushes, especially those compliant with ISO 3547, offer a reliable, maintenance-free solution for various demanding applications. Whether with steel or bronze backing, these bushes provide excellent performance, durability, and cost-effectiveness, making them a preferred choice in many industries.
