The Hydraulic System
- Lock cylinder, front roof
- Roof cylinder, left
- Roof cylinder, right
- Main cylinder, left
- Main cylinder, right
- Lock cylinder rear roof, left
- Lock cylinder rear roof, right
- Cylinder tonneau cover, left
- Cylinder tonneau cover, right
- Cylinder trunk lid, left
- Cylinder trunk lid, right
- Hydraulic pump
- Splitter box, hydraulic hoses
The hydraulic system consists of:
- hydraulic pump
- 4 hydraulic valves
- 11 hydraulic cylinders
- 1 Splitter box
All hydraulic cylinders are dual-acting cylinders with single-sided piston rod. The hoses are attached with quick-release couplings.
The hydraulic cylinders operate the various roof functions independently and in pairs.
Hydraulic fluid is distributed from the splitter box to the hydraulic cylinders for the tonneau cover and the cargo compartment.
Only used hydraulic oil intended for this hydraulic system.
Hydraulic unit
- Electric motor that drives the hydraulic pump
- Housing
- Fluid reservoir
- Relief valve
- Lock for relief valve
- Electrically operated hydraulic valve (x4)
- Cable for release of relief valve lock
- Hydraulic hoses
The hydraulic unit is located in the cargo compartment underneath the ski hatch. The convertible roof module (CRM) regulates the electric motor that drives the hydraulic pump clockwise or counterclockwise. The direction of rotation depends on the sequence/position of the roof during opening/closing.
The housing contains ducts through which the fluid passes to/from the hydraulic pump, to/from the four electrically controlled hydraulic valves, to/from the hydraulic cylinders and to/from the fluid reservoir.
The four hydraulic valves are integrated in the hydraulic unit and are directly connected to the convertible roof module (CRM). The various positions of the hydraulic cylinders (and thereby the positions of the roof sections) are regulated by opening/closing the valves in different patterns.
The relief valve releases pressure in the system when it is lifted. The ducts with pressure are then connected to the return ducts, whereby system pressure drops. Before the valve can be lifted, the lock (5) must first release the valve. This is done by pulling the cable. The handle of the cable is located under the rear seat cushion.
The roof should be closed when relieving fluid pressure so that the roof does not collapse.
The hydraulic hoses are fitted in the housing with O-rings as seals. The hoses are secured with a screw. The hoses and housing have numbering to facilitate identification.
The hydraulic unit is enclosed by a casing to reduce noise from the pump.
Hydraulic cylinders
- Lock cylinder, front roof
- Roof cylinder, left
- Roof cylinder, right
- Main cylinder, left
- Main cylinder, right
- Lock cylinder rear roof, left
- Lock cylinder rear roof, right
- Cylinder tonneau cover, left
- Cylinder tonneau cover, right
- Cylinder trunk lid, left
- Cylinder trunk lid, right
- Hydraulic pump
- Splitter box hydraulic hoses
A = Open
B = Closed
All hydraulic cylinders are double acting cylinders with single side pistons. The piston/cylinder diameter, stroke length and mounting differ depending on task.
Roof cylinders
The two roof cylinders open/close the front roof section. In addition, the roof cylinders lock the front roof section to the center roof section and the center roof section to the rear section.
The locking sequence is carried out after the roof closes and the unlocking sequence occurs before the roof starts to open.
Locking occurs by the lugs on the hydraulic piston engaging in a cut-out on the locking mechanism plate. This causes the catches to follow the piston movement, where the front roof section locks into the center roof section. A ball joint is secured to the plate, opposite the catches. A push rod is connected to the ball joint. When the locking mechanism's plate moves, the push rod also moves (as do the catches). The push rod then engages in the lock housing for the rear roof section whereupon the center roof section is locked to the rear roof section.
The sequence is reversed when unlocking. i. e. the roof sections are first released and then the front roof sections opens.
The lock cylinders for the front roof section, lock cylinders and cylinders cover panel.
These cylinders move on bearings at both the cylinder and piston through ball joints. The design means that the load on these cylinders is relatively small.
Master cylinders
The master cylinders close/open the center roof section directly via the main link arms and the rear roof section indirectly via its link arms.
The movement and geometry of the link system when opening and closing the roof, cause the pistons to move elliptically. The master cylinders are suspended to prevent breaks and stresses.
Cylinders, trunk lid
The cylinders for the trunk lid are exposed to relatively large forces and are therefore strongly dimensioned. The cylinders move on bearings via bolts at both the piston and cylinder.
Connection of the hydraulic hoses to the pump
F1 - F4 = hydraulic valves.
Connection of the hydraulic hoses to the splitter box