Starter Motors and Generators
Bosch starter motors – the power packs
in miniature for reliable engine start
Starter motors: reliable, light and compact
Bosch starter motors for passenger cars are available
in a wide variety of series and sizes, and are successfully employed worldwide in an enormous variety of
vehicles with gasoline and diesel engines. To increase
their efficiency and performance, Bosch has constantly
been improving the key starter motor components,
making them ever smaller. Our series C, R, and S
starter motors have convincing performances of up to
2.5 kW, combining reliable operation and a long
lifetime with low weight and compact design. The minimal space requirements of these reduction-gear
starter motors offer additional design freedom for
vehicle developers.
Output up to 2.5 kW
Product description
Further development work on the permanent magnets
Bosch starter motors stand for high performance,
enabled the starter motor to be designed for output
long life, outstanding quality, and reliability. Our
powers up to 2.5 kW. This is appropriate for gasoline
product portfolio comprises a wide range of
engines with displacements in excess of 6.2 liters and
innovative starter motors for passenger cars.
for diesel engines up to 4.0 liters.
Robust, technologically mature solutions for gaso­
line and diesel engines which fulfill the require-
Advantages of Bosch starter motors:
ments of vehicle manufactures and offer the best
▶ Lower fuel consumption thanks to reduced weight
possible starting reliability – even in the toughest
▶ High torques for high power outputs
of conditions. Thanks to their lightweight, com-
▶Reliable operation throughout the vehicle’s
pact design, our starter motors help to reduce
service life
fuel consumption and emissions, while their
▶ Quiet operation
small size gives automotive engineers additional
▶ Maintenance-free
design freedom. Based on these reduction-gear
▶ Low installation-space requirements
starter motors we offer starting solutions to
▶ Reliable functioning even at very low temperatures
match every kind of passenger car – with a high
▶ Corrosion-resistant
power-to-weight ratio and the highest build quality.
In addition to these conventional starter motors,
Bosch supplies efficient start-stop starter motors
for especially economical and environmentallyfriendly start-stop systems.
Starter Motors and Generators | Bosch starter motors – the power packs in miniature for reliable engine start
Innovative design: for universal use
Start-stop starter motors:
Bosch start-stop starter motors offer a wide range of
lower fuel consumption, fewer emissions
functions and performance. They are suited to use in
Ideally, conventional starter motors can contribute
a variety of vehicles, gasoline or diesel, manual or auto­
toward small reductions in fuel consumption and
matic. Due to their compact dimensions, they are as
emissions via lightweight construction. But start-stop
easy to install in the vehicle as a conventional starter
starter motors from Bosch reduce both CO₂ output
motor.
and fuel consumption in real urban traffic by up to
15 % – and thanks to their robust construction, they
Robust technology: for a vehicles entire life
last a whole vehicle life. Our experience in series utili-
The number of starting operations performed by the
zation impressively confirms this.
starter motor, its lifetime in other words, has been
considerably increased for this special application.
The operating principle behind start-stop systems is
Greater design strength has enabled the starter
as simple as it is efficient: when the vehicle comes to
motor to survive the more frequent starts throughout
a stand and providing the battery charge is adequate,
the lifetime of the vehicle without suffering damage.
the combustion engine is switched off and automati-
The following measures have been undertaken:
cally restarted when needed by releasing the brake
pedal. So when traffic comes to a stop, in jams or at
▶Strengthening of bearings subjected to heavy
a red light, for instance, no fuel is consumed nor any
loading
CO₂ emitted. And noise emissions also drop to zero.
▶Further improved planetary gear
▶Use of strengthened pinion-engaging mechanics
▶Optimization of commutator system
Application
Conventional starter motor type
Output
class
Gasoline
Diesel
0.8 kW
~ 1.2 l
—
1.0 kW
~ 1.6 l
~ 1.2 l
Type
C60
Start-stop starter motor type
Diameter
(mm, ⌀ D)
Length
(mm, L)
Weight
(kg)
Type
Diameter
(mm, ⌀ D)
Length
(mm, L)
Weight
(kg)
61
142
1.9
—
—
—
—
61
149
2.0
SC60-L
61
161
2.2
1.2 kW
~ 2.0 l
~ 1.4 l
61
158
2.2
SC70-S
70
166
2.8
1.4 kW
~ 3.0 l
~ 1.6 l
70
170
2.9
SC70-M
70
170
2.9
1.7 kW
~ 4.0 l
~ 2.0 l
70
180
3.1
SC70-L
70
180
3.1
2.2 kW
~ 6.2 l
~ 3.0 l
R74-E
74
183
3.5
S74-E+
74
183
3.5
2.5 kW
—
~ 4.0 l
R78-M
78
188
4.3
S78-M
78
188
4.3
C70
⌀ (D1)
(A)
⌀ (D2)
Main dimensions – Start-stop starter motor SC70-M
(L)
Robert Bosch GmbH
Starter Motors and Generators
Postfach 30 02 40
70442 Stuttgart
Germany
www.bosch-mobility-solutions.com
Printed in Germany
292000P1G6-C/CCA2-201508-En
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