|
|
 |
Parameter |
 |
|
 |
| |
Clearance and Fit
When a standard-type HUACHENG linear bushing is used with a shaft,inadequate
clearance,adjustment may cause early bush failure and/or poor, rough traveling.
The clearance adjustable linear bush and open linear bush can be clearance
adjusted when assembled in the housing which can control the outside cylinder
diameter. However, too much clearance adjustment increases the deformation of
The outside cylinder cylinder,to affect its precision and life.therefore,
the appropriate clearance between the bush and shaft,and clearance
between the bush and housing are required according to the application.
|
Table 2 shows recommended fit of the bush: |
|
Division |
Shaft |
Housing |
Model |
|
Normal fit |
Transitional |
Loose fit |
Tight fig |
LM |
High class |
g6 |
h6 |
H7 |
J7 |
LMB |
LME |
High class |
h6 |
j6 |
H7 |
J7 |
|
| |
| Note:The clearance may be zero or negative.Please attention the movement |
|
Shaft and Housing
To optimize performance of the HUACHENG linear bushing high precision of the shaft and housing is required. |
|
1 .Shaft
The rolling balls in the HUACHENG linear bushing are in point contact with the shaft
surface Therefore,the shaft dimensions,tolerance,surface finish,and hardness greatly
affect the traveling perfomance of the bush.The shaft should be manufactured with due
attention to the following points:
1.since the surface finish critically affects smooth rolling of balls,grind the shall at 1.5 S
or better
2.The best hardness of the shaft is HRC 60 to 64.Hardness less than HRC 60 decreases
the life considerably,and hence reduces the permissible load. On the other hand,
hardness over HRC 64 accelerates ball weer.
3.The shaft diameter for the clearance adjustable linear bush and open
linear bush should as much as possible be of the lower value of the in
scribed circle diameter in the specification table. Do not set the shaft
diameter to the upper value.
4.Zero clearance or nagative clearance increases the frictional resistance
slightly, if the negative clearance is too tight,the deformation of the outside
cylinder will become larger,to shorten the bush life.
|
|
|
| |
2.Housing
There is a wide range of housings differing in design,machining,and
mounting. For the fitness and shapes of housings,see Table 2 and the
following section on mounting. |
| |
|
| <<BACK NEXT>> |
| |
|
|
