Valve Spool
GMB Valve Spool
Modern automatic transmission (AT) mainly uses 8-speed type for vertical setting FR engine and 7-speed type for horizontal setting FF engine. AT types vary like ; step automatic transmission (step AT), continuous velocity transmission(CVT) and dual clutch transmission(DCT). All of these devices carry aluminum valve body. Aluminum material valve spool fits valve body of same material with significant merit of oil leak reduction as well as weight saving. World class production volume, 200Mpcs, is rolled out in GMB every year.
| Standard materials | |
|---|---|
| Steel | SUM22, SUM24L |
| Aluminum | A6061-T6, A2017, A2011, A6262A, A6020, A6082 |
Function
Critical part for automatic transmission to change speed and direction. Installed into control valve regulating oil pressure and enable automatic gear change. It is a super precision hydraulic valve.
Product grades
Excellent
Good
Not so Good
| No | Manufacturer | Standard specification comparison | |||
|---|---|---|---|---|---|
| Roughness | Roundness | Cylindricity | Coaxiality | ||
| MAX | MAX | MAX | |||
| 1 | GMB | | | | |
| 2 | Japanese manufacurers | | | | |
| 3 | American manufacuturers | | | | |
| 4 | German manufacturers | | | | |
