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Installation
Installation (press-fitting)
Install (press-fit) using hydraulic pressure, pneumatic pressure, or a vise.
- Press-fitting with force, such as hammering, will result in bearing damage or a change in its bore.
When installing, use the recommended tolerance (H7) for the dimensions of the housing bore as shown in the catalog. - #500SP1 SL1 spherical bearing (SPS): K7 (general use), N7 (high loads)
#2000 high-precision bearings (CLB and CLF): H6
When replacing a bearing in a blind hole, the design of the surroundings must take removal into consideration.
Press-fitting jig
In general, use a mandrel to insert the bushing in the insertion site in the housing as shown in Figure 1.
The use of a guide ring, as shown in Figure 2, facilitates press-fitting.
The use of a guide ring is effective at ensuring the roundness and centering of the bore after press-fitting and in preventing damage to the bushing during press-fitting.
Figure 1 Typical press-fitting Figure 2 Press-fitting with a guide ring
- To facilitate press-fitting of the bushing, the edge of the housing bore should be chamfered where the bushing will be inserted.
The housing should have an R chamfer or a tapered chamfer.
If it has a C chamfer (C1.0 or less), make sure there are no burrs. The use of oil or grease can facilitate press-fitting.
Mandrel dimensions should be determined based on the table below.
| Bushing dimensions (nominal) | Mandrel dimensions |
|---|---|
| Inner diameter(D0) | d0=D0-(0.05～0.10) |
| Outside diameter(D1) | d1=D1-(0.20～0.30) |
| Length(L) | ℓ≧L |
Figure 3 Mandrel dimensions
Guide ring dimensions should be determined based on the table below.
| Bushing inner diameter | Guide ring inner diameter | Guide ring outside diameter |
|---|---|---|
| Φ40 | D1+(0.1～0.3) | D1+(10～15) |
| Φ42～φ60 | D1+(0.2～0.5) | |
| Φ65～ | D1+(0.5～1.0) |
The inner diameter of the guide ring should be large enough to allow gentle press-fitting of the bushing by hand.
The length of the guide ring should be at least 1/3 of the length of the bushing. If possible, it should be the same length as the length of the bushing.
Figure 4 Guide ring dimensions
When using a screw on a metallic bearing to prevent loosening or turning
A screw to prevent loosening and turning must be installed in a position away from load points. After the bearing is set in the housing, a locking screw with a diameter equivalent to the thickness of the bearing wall should be machined at a position towards the housing by about 20 to 30% of the screw diameter as shown in Figure 5.
An end mill should be used when machining holes.
Figure 5 Position to prevent turning (reference image)
Removal
When using a screw on a metallic bearing to prevent loosening or turning
After removing the screw, the bushing can easily be removed using a mandrel in the same manner as during press-fitting.
Removal jig (for a through hole)
Figure 6 Mandrel dimensions
