Leonardus LAUWERS / Cornelis
Near 100% efficient, compact, fast, shiftable
under full load, 7x higher starting torque.
Nieuwe Voorthuizerweg 13a
3862 RV Nijkerk
L. Lauwers: +31 6 54 29 04 44
J. Bosch: +31 6 25 21 41 34
SmeshGear is an high speedshift gearbox that shifts gear under
full load, without loss of energy
SmeshGear is a basic transmission that is compact, fast, and
shiftable under full-load . Changing gears takes less than
0.001157 seconds with continuous output power! SmeshGear operates
SmeshGear provides a selectable, additional (higher or lower)
speed-ratio on a rotating shaft. The original performance remains
what it was, virtually 100%. The additional speed-ratio has yields
greater than 98%.
It makes no difference whether the direction of rotation is left,
right, or variable.
No matter where the power comes from, where it goes, or even if it
varies: SmeshGear processes it flawlessly.
SmeshGear is patented worldwide. A gearbox that combines the many
benefits of existing transmissions, without the disadvantages!
Fail-safe and well proven.
With the same (electric) motor: SmeshGear provides these
• A much wider range of speeds
• Less energy is used, enhancing the range and/or top speed.
Mechanical translation keeps the motor operating in the optimal
• An up to seven times higher starting torque possible.
• The rpm range is much larger. The motor remains in its ideal rpm
• An up to seven times higher breakout force is possible.
• It can provide rapid movement in some applications (e.g. it can
quickly raise and lower a crane, when it is not loaded, saving
• SmeshGear can function as a gear coupling, i.e. start/run
without load. With the same total performance SmeshGear permits:
• An up to 40% smaller electric motor
• An up to 40% greater range, due to higher electrical efficiency
• A much smaller electrical and electronic infrastructure
• Smaller change, start-up and operational currents, as well as
higher machine efficiency, especially for operations with many
starts and stops
• An electric motor to maintain its power band at high speed.
Yield increases of 25% and more are easily possible for SmeshGear
COMPACT TRANSMISSION COMPRISING A PLANETARY GEAR SET
[ PDF ]
Inventor(s): LAUWERS LEONARDUS / GIJSBERTUS CORNELIS
Also published as: WO2009145616 // NL2001629 // JP5539334
A transmission has a housing and two input/output shafts. Inside
the housing is a planetary gear set with three rotatable members
which are connected to the housing and the two input/output
shafts. Inside the housing is a clutch which can connect two out
of three of the rotatable members. When the clutch is closed the
input/output shafts are connected together one to one. The
pressure plate of the clutch is connected to a brake disc of a
brake system that is connected to one of the rotatable members.
When the brake system is closed the input/output shafts are
connected via the planetary gear set. The transmission further
includes a lever which can move the brake disc in axial direction
and can thus open the clutch during operation.
FIELD OF THE INVENTION
 The invention relates to a transmission comprising a first
input/output shaft, a second input/output shaft, a planetary gear
set comprising three rotatable members of which a first rotatable
member is connected to the first input/output shaft and a second
rotatable member is connected to the second input/output shaft,
which transmission further includes a clutch having a first clutch
portion which is connected to one of the rotatable members, a
second clutch portion which is connected to another one of the
rotatable members and is axially movable relative to the first
clutch portion, and an axially movable pressure plate, and which
transmission includes a brake with a brake disc that is fixedly
attached to the pressure plate and at least one brake pad fixedly
connected to the firm object in the direction of rotation of the
brake disc and movably connected to the firm object in axial
direction of the brake disc, the brake disc being movably
connected in axial direction to a third one of the rotatable
members and being fixedly connected in the direction of rotation
to a third one of the rotatable members.
STATE OF THE ART
 A transmission of this type is known from FR-A-1.134.821.
This known transmission has a gear reduction between the two
input/output shafts determined by the indirect couplingS if the
brake is closed and a direct coupling between the two input/output
shafts if the clutch is closed. When the brake is closed the
clutch is opened at the same time, so that the two can never be
closed together. The known transmission takes up relatively much
space. In addition, with the known transmission it is impossible
to switch during operation because then the transmission utilizes
two gears and is consequently blocked.
SUMMARY OF THE INVENTION
 It is an object of the invention to provide a transmission
of the type set out in the opening paragraph which is more compact
than the known transmission. For this purpose the transmission
according to the invention is characterised in that the
transmission includes a housing in which the planetary gear set
and the clutch are arranged while the third rotatable member is
attached to the housing. As a result, a compact construction is
obtained. Since the housing can be sealed in a simple manner by
means of sealing rings between the input/output shafts and the
housing, the planetary gear set can be lubricated in a simple
manner and/or the clutch can be arranged as a wet plate clutch. In
addition, the oil baths of various mutually coupled transmissions
can be coupled to each other in a simple manner.
 An embodiment of the brake disc according to the invention
is characterised in that the brake disc is situated at a distance
from an axial side of the housing, while a brake disc side turned
away from the housing forms a braking surface that cooperates with
the brake pad and the other axial side of the housing forms a
further braking surface, and the brake includes a further brake
pad that cooperates with the further braking surface. In
consequence, a robust construction of the brake is obtained that
requires little additional space.
 A further embodiment of the brake disc according to the
invention is characterised in that the transmission comprises
disengaging means which are capable of axially displacing the
brake disc and thus pushing away the pressure plate of the clutch
portions and opening up the clutch. As a result, the transmission
can also be transited to a state where the two input/output shafts
 Yet a further embodiment of the brake disc according to the
invention is characterised in that the disengaging means comprise
a lever that is rotatable around a pivot which is bearing-mounted
on the housing, one end of which lever can be operated and the
other end is bearing-mounted on the brake disc. As a result of
this construction the two input/output shafts can be disengaged
even during operation.
BRIEF DESCRIPTION OF THE DRAWINGS
 The following description relating to the appended
drawings, the whole given by way of non-limiting example of the
transmission according to the invention, will provide better
understanding of how the invention can be realised, in which:
 FIG. 1 shows a first embodiment of the transmission
according to the invention;
 FIG. 2 shows a second embodiment of the transmission
according to the invention; and
 FIG. 3 shows a third embodiment of the transmission
according to the invention.
DETAILED DESCRIPTION OF THE DRAWINGS
 FIG. 1 shows a sectional view of a first embodiment of the
transmission according to the invention. The transmission 1
comprises a housing 3 and two input/output shafts 5, 7, while in a
bore in the first end of the first input/output shaft 5 is
arranged a shaft head-end attached to the end of the second
input/output shaft 7. Inside the housing 3 there is located a
planetary gear set 9 having three rotatable members which are
formed by a sun gear 11, a planet gear support 13 with planet
gears 14 thereon, and an annulus gear 15. The sun gear 11 is
connected to the first input/output shaft 5, the planet gear
support 13 is connected to the second input/output shaft 7, and
the annulus gear 15 is rigidly connected to the housing 3.
 The housing further accommodates a clutch 17 of which a
first clutch portion 19 is connected by means of the housing 3 to
the annulus gear 15, and a second clutch portion 21 is connected
by means of the second input/output shaft 7 to the planet gear
support 13. The first clutch portion 19 is constituted by a wheel
attached to the housing and a further wheel axially movable
relative to the housing and fixed to the housing in the direction
of rotation. The second clutch portion 21 is constituted by two
clutch discs which are axially movable relative to the second
input/output shaft and are fixedly attached to the second
input/output shaft 7 in the direction of rotation. One of the
clutch discs is present between the two wheels of the first clutch
portion 19 and the other clutch disc is present between the
movable disc and an axially movable pressure plate 23 of the
clutch. This pressure plate 23 is pressed down by springs 25 and
presses the clutch plates and wheels together.
 The transmission 1 further includes a brake 27 with a brake
disc 29 and two brake pads 31 and 33 connected to the firm object.
The brake disc 29 is present at a distance beside an axial side of
the housing 3 and fixedly fitted to the pressure plate 23 by means
of rods 35. The brake pads 31, 33 can be pushed against a side 39
of the brake disc 29 and a side 41 of the housing 3 by means of a
hydraulic cylinder 37. These sides 39 and 41 then constitute
braking surfaces. The brake disc is movable in axial direction and
is fixedly fitted to the annulus gear 15 in the direction of
 The transmission 1 further includes disengaging means 43
which are capable of moving the brake disc 29 in axial direction
and thus pushing away the pressure plate 23 of the clutch means 19
and 21 and opening up the clutch 17. These disengaging means 43
have a lever 45 which can rotate around a pivot 47 which is
bearing-mounted on the housing 3. The free end 49 of the lever can
be operated and the other end 51 is bearing-mounted on the brake
disc 29. The lever 45 does not rotate relative to the firm object
and can thus be operated in a simple manner during functioning
while this lever, via the brake plate 29, pushes the pressure
plate 23 away from the two clutch portions 19 and 21 against the
force of the springs 25 and thus opens up the clutch 17.
 FIGS. 2 and 3 show two further embodiments of the
transmission according to the invention, where the planetary gear
set 9 is connected to the housing 3 and to the two input/output
shafts 5 and 7 in a different manner. In the transmission 53 shown
in FIG. 2 the sun gear 11 is fitted to the housing 3, the planet
gear support 13 is connected to the first input/output shaft 5 and
the annulus gear 15 is connected to the second input/output shaft
7. In the transmission 55 shown in FIG. 3 the sun gear 11 is
fitted to the first input/output shaft 5, the planet gear support
13 is fitted to the housing and the annulus gear 15 is connected
to the second input/output shaft 7.
 Albeit the invention has been described in the foregoing
with reference to the drawings, it should be pointed out that the
invention is not by any manner or means restricted to the
embodiment shown in the drawings. The invention also extends over
any embodiment deviating from the embodiment shown in the drawing
Figures within the spirit and scope defined by the claims. For
example, by adapting the construction the brake pads 31 and 33 can
be arranged in an electrically adjustable manner in lieu of a
hydraulically adjustable manner.
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