Products · Radial Piston Motors
TMK04 Compact Inner-Curve Radial Piston Motor
An integrated drive unit — motor, output shaft, and parking brake in one extremely compact body. Roller-type piston contact reduces friction where flat-face designs wear.
TMK04 is an inner-curve radial piston motor with end-face oil distribution. Its rollers ride the cam curve instead of sliding — reducing friction and wear compared with flat-face piston contact.
The defining feature is integration: motor + shaft + parking brake ship as one unit, giving OEMs a bolt-in traction drive with load-holding built in — no separate brake engineering, no extra envelope.
Typical duty: rear-axle wheel traction on road rollers and similar compact machines where space is tight and slope holding is mandatory.
Specifications · TMK04
| Type | Inner-curve radial piston, end-face oil distribution |
| Displacement | 270 – 400 ml/r |
| Torque | 974 – 1,460 N·m |
| Speed range | 100 – 120 r/min |
| Piston contact | Roller type — reduced friction vs. flat-face |
| Integration | Motor + shaft + parking brake in one unit |
| Strength | Extremely compact relative to torque output |
Used in these application guides