Double Acting Piston Seals
Claron produce four main types of polymer bearings for use in hydraulic cylinder applications. Each has a varying set of properties to cover a wide range of applications. The following tables are
designed to help select the correct type for a given application.
Table 1 shows the properties for each type of bearing. Values shown as low/high should be interpreted as relative to each other.
| BGF | BT | EBR | PBR | |
| Material | Modified & Filled PA | Bronze Filled PTFE | POM | Reinforced Phenolic |
| Max Operating Temp °C | 110 | 200 | 110 | 120 |
| Max Linear Velocity m/s | 1.5 | 15 | 1 | 3 |
| Coefficient of friction | 0.15 | 0.06 | 0.14 | 0.12 |
| Load Capacity | High | Low | Normal | High |
| Sevice Life | High | High | Normal | Normal |
| Relative Cost factor | 1.5 | 3 | 1 | 3.5 |
| Production of
contamination |
Normal | V.Low | Normal | High |
| Modification of metal
finish |
High | V.Low | Normal | High |
| Chemical resistance | Normal | V.High | Normal | Normal |
Table 2 shows a summary of recommended uses.
| Type | Recommended Uses |
| BGF | Applications requiring high bearing capacity and long service life. |
| BT/CT | All applications utilising PTFE based seals. Applications requiring smooth low friction operation. Applications with poor lubrication, or high speeds. Type CT should be used for pneumatic applications or for non-ferrous metals. |
| EBR | Standard applications requiring a low cost but efficient bearing. |
| PBR | Applications requiring high bearing capacity at high temperatures, or where the ‘dieseling effect’ (ignition of vapour) may take place. |
To calculate the maximum allowable bearing load in Newtons for a Claron bearing ring used in standard hydraulic cylinder applications, multiply the projected area by the load capacity as follows:-
- To calculate the projected area multipy the ID of the bearing by its width:-
Projected area= ID(mm) x W(mm)
- Multiply the projected area by the load capacity taken from figure 2 for the required maximum operating
Bearing Load = Projected Area x Load capacity
Note:
Figure 1 shows that the load distribution is not even along the projected area, this however has already been taken into account in the calculation of load capacity in figure 2.
For unlubricated applications Claron recommends the use of Carbon bearing tape CT. See section E2
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