BMW 3: Introduction
The automatic transmission GA8P75HZ of the G20 PHEV, which is based on the
transmission
introduced in the F07 at the end of 2009 (GA8HP70Z), is also manufactured by ZF.
If you have already taken part in the training for the 2nd generation of BMW
ActiveHybrid vehicles, you
will already be familiar with the GA8P70HZ transmission used there. The
structure of the automatic
transmission GA8P75HZ of the G20 PHEV is similar.
GA8P75HZ transmission
Structure and function
Overview
In order to satisfy the requirements of a Plug-in Hybrid Electric Vehicle,
the automatic transmission
was adapted. For this purpose, some existing components have been modified or
replaced with
other components. A part of the damping system was also extracted from the
transmission area and
connected to the combustion engine as a dual-mass flywheel with integrated
centrifugal pendulum.
The connection to the transmission is effected via a spline.
As a result of the larger electrical machine and the additional torsional
vibration damper, the housing of
the GA8P75HZ transmission was extended by 30 mm in comparison to the GA8P70HZ
transmission.
The hybrid area in the GA8P75HZ transmission can be divided into 5 components:
- Dual-mass flywheel
- Additional torsional vibration damper
- Separation clutch
- Electric motor
- Electrical transmission oil pump for supplying oil pressure
when transmission input shaft is idle.
Like on the GA8P70HZ transmission, the multidisc brake B is also reinforced
in the GA8P75HZ
transmission by increasing the diameter and number of discs and is equipped with
actively controllable
transmission oil cooling. This is necessary as, in addition to its function as a
shift element, it must also
enable the vehicle to start-up and crawl.
GA8P75HZ transmission
- Dual-mass flywheel (including torsional vibration damper
and centrifugal pendulum)
- Additional torsional vibration damper
- Separation clutch
- Electric motor
- Multidisc brake B
- Electrical transmission oil pump
The transmission power flow of the GA8P75HZ transmission shows how the new
components have
been integrated in the automatic transmission.
Schematic structure of the GA8P75HZ transmission
- Torsional vibration damper
- Centrifugal pendulum
- Additional torsional vibration damper
- Electric motor
- Gear set 1
- Gear set 2
- Gear set 3
- Gear set 4
- Mechanical transmission oil pump
- Multidisc brake A
- Multidisc brake B
- Multidisc clutch C
- Multidisc clutch D
- Multidisc clutch E
K0. Separation clutch
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In order to reduce fuel consumption and CO2 emissions, high-charged engines
are used, the number
of cylinders is reduced and the drivable speeds are lowered.
However, with these measures the torsion
Brakes and clutches are described as shift elements which make possible the
shifting and changing
of all gears. Like in the GA8HP70Z transmission, the following shift elements
are also used in the
G
The basic functions of the oil circuit of the GA8P75HZ transmission
correspond to those of the
GA8HP70Z transmission. The oil has the following tasks:
Lubrication
Control of the shift elements
Co
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Opening
Press onto the cover.
Closing
Pull the cover on the handle bar back.
Storage compartment in
the rear center console
With the corresponding equipment, the back of
the center console contains a storage compartment.
Center armrest, front
General information
A storage compartment is located in
Concept
The integrated Universal Remote Control in the
interior mirror can operate up to 3 functions of
remote-controlled systems such as garage door
drives, barriers, or lighting systems.
General information
The Integrated Universal Remote Control replaces
up to 3 different hand-held transmitters.