Hydraulic Rod End Bearings GK Series
Hydraulic rod end bearings are specialized joint bearings featuring spherical plain bearings mounted on rod ends. These components belong to a specific category within joint bearing systems designed for heavy-duty industrial applications.
Product Overview
Spherical plain bearings are sliding bearings with spherical contact surfaces, consisting of inner and outer rings with complementary spherical sliding surfaces. The basic design includes an inner ring with an outer spherical surface and an outer ring with an inner spherical surface, engineered to withstand substantial loads.
Depending on type and structure, these bearings can accommodate radial loads, axial loads, or combined radial and axial loads simultaneously. The composite material embedded on the inner ring's outer spherical surface enables self-lubrication during operation.
Typically used for low-speed oscillatory motion, these bearings can also perform tilting movements within specific angular ranges and function effectively even with significant misalignment between supported shafts and housing bores.
Product Specifications:
| Bearing Code |
Dimensions (mm) |
Load Rating kN |
=a° |
Unit Weight (kg) |
| d |
B |
dk |
C1 |
d2 |
h |
l2 |
l7 |
d5 |
d6 |
e |
rs |
Dynamic |
Static |
| GK10DO |
10 |
9 |
16 |
7 |
29 |
24 |
38.5 |
15 |
15 |
3 |
2 |
0.3 |
8.1 |
15 |
12 |
0.041 |
| GK12DO |
12 |
10 |
18 |
8 |
34 |
27 |
44 |
17.5 |
17.5 |
3 |
2 |
0.3 |
10 |
21 |
10 |
0.066 |
| GK15DO |
15 |
12 |
22 |
10 |
40 |
31 |
51 |
20 |
21 |
4 |
2.5 |
0.3 |
16 |
32 |
8 |
0.120 |
| GK17DO |
17 |
14 |
25 |
11 |
48 |
35 |
58 |
23 |
24 |
4 |
3 |
0.3 |
21 |
31 |
10 |
0.190 |
| GK20DO |
20 |
16 |
29 |
13 |
53 |
38 |
64.5 |
27.5 |
27.5 |
4 |
3 |
0.6 |
21 |
40 |
10 |
0.180 |
| GK25DO |
25 |
20 |
35.5 |
17 |
64 |
45 |
77 |
33 |
33.5 |
4 |
4 |
0.6 |
48 |
75 |
7 |
0.450 |
| GK30DO |
30 |
22 |
40.7 |
19 |
73 |
51 |
87.5 |
37.5 |
40 |
4 |
4 |
0.6 |
62 |
95 |
6 |
0.670 |
| GK35DO |
35 |
25 |
47 |
21 |
82 |
61 |
102 |
43 |
47 |
4 |
4 |
0.6 |
79 |
125 |
6 |
1.020 |
| GK40DO |
40 |
28 |
53 |
23 |
92 |
69 |
115 |
48 |
52 |
6 |
5 |
0.6 |
99 |
156 |
7 |
1.400 |
| GK45DO |
45 |
32 |
60 |
27 |
102 |
77 |
128 |
52 |
58 |
6 |
5 |
0.6 |
127 |
208 |
7 |
1.930 |
| GK50DO |
50 |
35 |
66 |
30 |
112 |
88 |
144 |
59 |
62 |
6 |
6 |
0.6 |
156 |
250 |
6 |
2.690 |
| GK60DO |
60 |
44 |
80 |
38 |
135 |
100 |
167.5 |
72.5 |
70 |
6 |
8 |
1 |
245 |
294 |
6 |
4.000 |
| GK70DO |
70 |
49 |
92 |
42 |
160 |
115 |
195 |
85.5 |
80 |
6 |
10 |
1 |
313 |
510 |
6 |
7.000 |
| GK80DO |
80 |
55 |
105 |
47 |
180 |
141 |
231 |
98 |
95 |
6 |
10 |
1 |
400 |
620 |
6 |
11.000 |
Key Features & Benefits
- High Structural Rigidity: Welded earrings create integrated connections that are more secure than bolted connections, enhancing overall structural rigidity and torsional resistance
- Flexible Installation: Earring design allows installation from multiple angles and supports various connection methods including single earrings, double earrings, and flanges to accommodate different cylinder layouts
- Wear Resistant & Low Maintenance: Composite materials on inner and outer spherical surfaces enable self-lubrication during movement, reducing external lubrication requirements in frequent refueling conditions
- Cost Effective: Simple structure and easy installation reduce wearing part quantities and assembly time, lowering overall procurement and maintenance costs
Application & Usage Information
Where are these bearings used?
Widely used in low-speed oscillatory, tilting, and rotary motions across multiple industries including hydraulic cylinders, mining machinery, mechanical engineering, construction machinery, and production lines.
Why choose hydraulic cylinder bearings over other types?
These bearings feature weldable faces that can be firmly welded, serving as reliable connections between cylinders and structural components with superior load distribution.
How to select the ideal bearing?
- Ensure inner diameter (d), outer diameter (D), and thickness (B) match shaft diameter and installation space requirements
- Verify earring bore diameter and welding dimensions comply with design drawings to ensure welding strength and positioning accuracy
- Select appropriate clearance: Choose larger clearance (C3 clearance) for high-temperature or high-speed working conditions to prevent jamming from thermal expansion
Proper Installation Methods
Cold Installation (Small Sizes):
- Apply uniform force to inner or outer ring using a sleeve and pressing machine
- Insert bearing into shaft or bearing seat without directly striking with a hammer
- Apply small amount of lubricating oil on contacting surfaces to reduce friction
Hot Installation (Larger Sizes):
- Heat bearing to 80-100℃ before inserting onto shaft
- Use induction heaters or oil bath heating for even heat distribution
- Avoid heating bearings with seals or dust covers above 80℃ to prevent seal material damage
Purchasing Guide
- Loading Type and Force: Determine radial load, axial load, or composite load, then estimate maximum force value. For high-impact or heavy-load scenarios (excavators, rollers), recommend self-aligning roller bearings or welded joint bearings with thickened outer rings
- Motion Form: Consider swing angle and frequency. Small-angle high-frequency swing suits self-lubricating joint bearings (GK series). Choose sealed radial joint bearings for large-angle low-frequency conditions
- Environmental Conditions: Select bearings with double-sided sealing (2RS), surface phosphating, or galvanizing treatment for harsh environments including high temperature, humidity, and dusty areas
- Installation Requirements: Accurately measure installation space and shaft diameter according to standard size charts
Available Sizes: SYX offers Hydraulic Rod End Bearings in full size range from small size GK10DO, GK15DO, GK17DO, GK20DO, GK25DO, GK30DO to GK80DO.
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