FIELD OF INVENTION
[001] The subject matter in general relates to marine vessel
propulsion system. More particularly, but not exclusively, the subject matter relates
to marine vessel having waterjet propulsion system capable of reversing the rotation
of output shaft to carry out back flushing for debris removal.
BACKGROUND/PRIOR ART OF INVENTION
[002] Background description includes information that may be useful in
understanding the present subject matter. It is not an admission that any of the
information provided herein is prior art or relevant to the presently claimed subject
matter, or that any publication specifically or implicitly referenced is prior art.
[003] Marine vessels have a wide variety of uses for fishing, military and
recreational activities. Various forms of propulsion systems have been used for
propelling the marine vessels over or through the water. One type of propulsion
system comprises a prime mover, such as an engine or a turbine, which converts
energy into a rotation that is transferred to one or more propelling shaft having
blades in contact with the surrounding water. The rotational energy in a propelling
shaft is transferred by contoured surfaces of the blades into hydrodynamic
propelling force or "thrust" which propels the marine vessel. As the propeller blades
push water in one direction, thrust and vessel motion are generated in the opposite
direction. Other marine vessel propulsion systems utilize waterjet propulsion
systems to achieve similar results. In Waterjet propulsion, the thrust produced by a
waterjet is generated from a water flow that is accelerated in between the entrance
at the inlet duct and exit at the nozzle. Such devices include a pump, a water intake
or suction port and an exit or discharge port. Typically, a water inlet port is located
upstream of the pump, the inlet port being positioned beneath the water line. The
water enters through the inlet port and is directed towards the pump in the inlet duct.
The water is then accelerated by the pump out the exhaust outlet port or nozzle thus
propelling the watercraft through the water.
[004] In order to remove the debris in the inlet port, clogging the impeller

automatically, it is required to carry out the back flushing. For back flushing the
water, the impeller shaft has to rotate in reverse direction.
[005] Reference may be made to the following known Patents:
[006] Prior attempts to satisfy the requirement of reversing the output shaft
rotation are disclosed in U.S. Patent No. 5,096,034 where in a pair of friction
clutches are rotatably disposed on the output shaft and are continuously driven in
opposite reverse and forward rotational directions by gears and sprockets-chain
mechanism associated with the input shaft. A double friction cope is helically
splined on the output shaft and moveable toward and away from the friction
clutches for selective frictional engagement with either friction clutch to cause the
output shaft to rotate in either a forward or reverse rotational direction. The double
cone includes a peripheral shifting groove having oppositely inclined side walls
which cooperate with a shifting pin disposed in the groove to disengage the double
cone and the friction clutch.
[007] Referring specifically to FIG. 1, disclosed is the arrangement of
reversing clutch assembly according to the prior art U.S. Patent No. 5,096,034.
Disclosed is a pair of friction clutches (48, 50) rotatably disposed on the output
shaft (20) and are continuously driven in opposite reverse and forward rotational
directions by gears (54, 58) and sprockets (60, 62) associated with the input shaft.
A double friction cope (94) is helically splined on the output shaft (20) and
moveable toward and away from the friction clutches (48, 50) for selective
frictional engagement with either friction clutch (48 or 50) to cause the output shaft
(20) to rotate in either a forward or reverse rotational direction. The double cone
(94) includes a peripheral shifting groove (112) having oppositely inclined side
walls (114) which cooperate with a shifting pin (120 disposed in the groove (112)
to disengage the double cone (94) and the friction clutch (48) or (50). This system
of reversing clutch mechanism has the following disadvantages:
[008] Mechanical shifting lever may subject to wear and tear while actuating
engagement/disengagement.

[009] For same direction of motion as that of the input shaft sprocket chain
mechanism is envisaged, which is noisy and not favourable for very high speed
applications.
[0010] A second such prior art system, disclosed in U.S. Patent No. 4,748,864
for reversing the rotation of output shaft where in a reversing gear assembly
includes a horizontal input shaft, an intermediate shaft which extends parallel with
an inclined output shaft. The input shaft fixedly mounts a cylindrical gear which
meshes with a forward drive conical gear on the output shaft and with a reverse
drive cylindrical gear on the intermediate shaft. Reverse drive gear train further
includes two meshing cylindrical gears on the intermediate and output shafts. The
gears on the output shaft are selectively coupled to this shaft by clutch means.
[0011] Referring specifically to FIG. 2, disclosed is the arrangement of
reversing clutch assembly according to the prior art U.S. Patent No. 4,748,864.
Disclosed is a reversing gear assembly (13) that includes a horizontal input shaft
(15), an intermediate shaft (17) which extends parallel with an inclined output shaft
(16). The input shaft (16 fixedly mounts a cylindrical gear (22) which meshes with
a forward drive conical gear (23) on the output shaft (16) and with a reverse drive
cylindrical gear (25) on the intermediate shaft (17). Reverse drive gear train further
includes two meshing cylindrical gears (26, 24) on the intermediate and output
shafts (17, 16). The gears (23, 24) on the output shaft (16) are selectively coupled
to this shaft by clutch means (32). This system of reverse gear assembly has
following limitations:
[0012] The embodiment suitable for propeller shaft to be positioned is inclined.
[0013] The system involves one cone gear meshes with cylindrical gear for
which manufacturing accuracy and backlash need to be critically controlled for
assembly and smooth operation.
[0014] A third such prior art system, disclosed in U.S. Patent No. 4,679,673
for reversing the rotation of output shaft wherein a reversing clutch assembly

includes three horizontal shafts or input shaft, clutch shaft and intermediate shaft,
and only one inclined shaft or output shaft. Clutch shaft has thereon forward and
backward direction gears which are driven by the input shaft through gear trains
comprising spur gears, and double-acting clutch mechanism for selectively
coupling each of the direction gears to clutch shaft. The conical gearing is disposed
only between clutch shaft and output shaft and thus includes only one conical gear.
[0015] Referring specifically to FIG. 3, disclosed is the arrangement of
reversing clutch assembly according to the prior art U.S. Patent No. 4,679,673.
Disclosed is a reversing clutch assembly that includes horizontal shafts or input
shaft (15), clutch shaft (17) and intermediate shaft (18), and only one inclined shaft
or output shaft (16). Clutch shaft (17) has thereon forward and backward direction
gears (28, 29) which are driven by the input shaft (15) through gear trains
comprising spur gears, and double-acting clutch mechanism (30) for selectively
coupling each of the direction gears (28, 29) to clutch shaft (17). The conical
gearing is disposed only between clutch shaft (17) and output shaft (16) and thus
includes only one conical gear (38). This system also having the limitations as
described for previous prior arts such as wear and tear due to mechanical shifting
and needs high manufacturing accuracies during machining of conical and
cylindrical gears. It also occupies more space by virtue of assembly arrangement of
three differently positioned shaft.
[0016] In view of the above, the present invention has been introduced which
can address the shortcomings of the prior arts and serve the purpose efficiently.
OBJECTS OF THE INVENTION
[0017] In view of the foregoing limitations inherent in the state of the art, some
of the objects of the present disclosure, which at least one embodiment herein
satisfy, are listed herein below.
[0018] It is an object of the present disclosure to provide a waterjet propulsion
system.

[0019] It is another object of the present disclosure to provide a waterjet
propulsion system for rotating output shaft in either direction.
[001] These and other objects and advantages of the present invention will be
apparent to those skilled in the art after a consideration of the following detailed
description taken in conjunction with the accompanying drawings in which a
preferred form of the present invention is illustrated.
SUMMARY OF THE INVENTION
[0020] This summary is provided to introduce concepts related to providing a
waterjet propulsion system for rotating output shaft in either direction. The concepts
are further described below in the detailed description. This summary is not
intended to identify key features or essential features of the claimed subject matter,
nor is it intended to be used to limit the scope of the claimed subject matter.
[0021] The present disclosure relates to a waterjet propulsion system for
rotating output shaft in either direction. The system comprises an input shaft
connected to an engine. An output shaft defines an oil supply port. A main driving
gear is mounted on the input shaft. A main driven gear is mounted on the output
shaft using roller bearings. The main driving gear meshes with the main driven gear.
A primary clutch driver ring and a primary clutch driven ring is provided. A primary
clutch assembly is provided between the primary clutch driver ring and the primary
clutch driven ring. An intermediate hub is connected to the output shaft using a
hydrodynamic bearing. A secondary clutch assembly is provided between the
intermediate hub and a secondary clutch driven housing. A forward driven gear is
in contact with the secondary clutch driven housing and the output shaft. A reverse
driven gear is connected to the intermediate hub using a hydrodynamic bearing. A
synchronizer bush is in contact with the reverse driven gear and the main driven
gear.
[0022] Other objects, features and advantages of the present disclosure will
become apparent from the following detailed description. It should be understood,

however, that the detailed description and the specific examples, while indicating
specific embodiments of the invention, are given by way of illustration only, since
various changes and modifications within the spirit and scope of the invention will
become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0023] While the specification concludes with claims particularly pointing out
and distinctly claiming the subject matter that is regarded as forming the present
subject matter, it is believed that the present disclosure will be better understood
from the following description taken in conjunction with the accompanying
drawings, where like reference numerals designate like structural and other
elements, in which:
[0024] FIG. 1 discloses an arrangement of reversing clutch assembly according
to the prior art U.S. Patent No. 5,096,034;
[0025] FIG. 2 discloses an arrangement of marine reversing gear assembly
according to prior art U.S. Patent No. 4,748,864;
[0026] FIG. 3 discloses an arrangement of marine reversing clutch assembly
according to prior art U.S. Patent No. 4,679,673;
[0027] FIG. 4 discloses a waterjet propulsion system (100) in a marine vessel,
in accordance with an embodiment of the invention; and
[0028] FIG. 5 discloses in detail the waterjet propulsion system (100), in
accordance with an embodiment of the invention.
[0029] The figures depict embodiments of the present subject matter for the
purposes of illustration only. A person skilled in the art will easily recognize from
the following description that alternative embodiments of the structures and
methods illustrated herein may be employed without departing from the principles
of the disclosure described herein.

DETAIL DESCRIPTION OF INVENTION WITH REFERENCE TO THE
DRAWINGS OF THE PREFERRED EMBODIMENTS
[0030] The detailed description of various exemplary embodiments of the
disclosure is described herein with reference to the accompanying drawings. It
should be noted that the embodiments are described herein in such details as to
clearly communicate the disclosure. However, the amount of details provided
herein is not intended to limit the anticipated variations of embodiments; on the
contrary, the intention is to cover all modifications, equivalents, and alternatives
falling within the spirit and scope of the present disclosure as defined by the
appended claims.
[0031] It is also to be understood that various arrangements may be devised
that, although not explicitly described or shown herein, embody the principles of
the present disclosure. Moreover, all statements herein reciting principles, aspects,
and embodiments of the present disclosure, as well as specific examples, are
intended to encompass equivalents thereof.
[0032] The terminology used herein is for the purpose of describing particular
embodiments only and is not intended to be limiting of example embodiments. As
used herein, the singular forms “a”, “an”, and “the” are intended to include the
plural forms as well, unless the context clearly indicates otherwise. It will be further
understood that the terms “comprises”, “comprising”, “includes”, “consisting”
and/or “including” when used herein, specify the presence of stated features,
integers, steps, operations, elements and/or components, but do not preclude the
presence or addition of one or more other features, integers, steps, operations,
elements, components and/or groups thereof.
[0033] It should also be noted that in some alternative implementations, the
functions/acts noted may occur out of the order noted in the figures. For example,
two figures shown in succession may, in fact, be executed concurrently or may
sometimes be executed in the reverse order, depending upon the functionality/acts
involved.

[0034] In addition, the descriptions of "first", "second", “third”, and the like in
the present invention are used for the purpose of description only, and are not to be
construed as indicating or implying their relative importance or implicitly
indicating the number of technical features indicated. Thus, features defining "first"
and "second" may include at least one of the features, either explicitly or implicitly.
[0035] Unless otherwise defined, all terms (including technical and scientific
terms) used herein have the same meaning as commonly understood by one of
ordinary skill in the art to which example embodiments belong. It will be further
understood that terms, e.g., those defined in commonly used dictionaries, should be
interpreted as having a meaning that is consistent with their meaning in the context
of the relevant art and will not be interpreted in an idealized or overly formal sense
unless expressly so defined herein.
[0036] Referring to FIG. 4, disclosed is a waterjet propulsion system (100) in
a marine vessel. It will be understood that the concepts of the present invention is
equally applicable to any type of marine propulsion system in which an output shaft
needs to be rotated in either direction.
[0037] An impeller (6) is connected to the waterjet propulsion system (100).
The impeller (6) sucks the water from an intake grid (8) and raises the dynamic
pressure head and pushes through the exit nozzle (1). The marine vessel propels
forward due to the reaction of leaving high velocity water jet. Along with the water,
debris enters into an intake grid (8) causing clogging of the flow passage which
reduces the water jet velocity. To purge the debris out, the impeller (6) is rotated in
reverse direction intermittently for back flushing. This is done using the waterjet
propulsion system (100).
STRUCTURAL CONFIGURATION OF THE WATERJET PROPULSION
SYSTEM 100
[0038] Referring to FIG. 5, disclosed in detail is the waterjet propulsion system
(100). The waterjet propulsion system (100) comprises an input shaft (32) which

may be connected to an engine transmission of the marine vessel. The power from
the input shaft (32) is transmitted to the output shaft (33) by means of a unique
gearing system.
[0039] In an embodiment, the output shaft (33) defines an oil supply port (24)
for transmitting oil.
[0040] The waterjet propulsion system (100) comprises a main driving gear
(20) and a main driven gear (13). The main driving gear (20) is mounted on the
input shaft (32) and the main driven gear (13) is mounted on the output shaft (33).
The main driven gear (13) is mounted on the output shaft (33) using roller bearings.
The main driving gear (20) is configured to mesh with the main driven gear (13).
[0041] In an embodiment, the main driven gear (13 comprises claws (34 on its
outer surface.
[0042] In an embodiment, with the help of the roller bearings, the main driven
gear (13) is configured to free wheel on the output shaft (33).
[0043] The waterjet propulsion system (100) further comprises a primary
clutch driver ring (14) and a primary clutch driven ring (16).
[0044] In an embodiment, a primary clutch assembly (15) is arranged between
the primary clutch driver ring (14) and the primary clutch driven ring (16). The
primary clutch assembly (15) comprises a spring loaded thrust bearing (19),
wherein the spring loaded thrust bearing (19) is configured to keep the primary
clutch assembly (15) engaged by exerting spring force.
[0045] In an embodiment, the primary clutch assembly (15) is a wet type
multidisc friction clutch.
[0046] The system further comprises an intermediate hub (17), wherein the
intermediate hub (17) is connected to the output shaft (33) using a hydrodynamic
bearing (28). The hydrodynamic bearing (28) is provided within the inner diameter

of the intermediate hub (17).
[0047] The waterjet propulsion system (100) further comprises a reverse driven
gear (26). The reverse driven gear (26) is connected to the intermediate hub (17)
using a hydrodynamic bearing (35). The reverse driven gear (26) is configured to
mate with the claws (34) on the main driven gear (13).
[0048] The waterjet propulsion system (100) further comprises a stopper (27)
connected to the reverse driven gear (26).
[0049] The primary clutch driven ring (16) is connected to the intermediate hub
(17) by means of a splined joint.
[0050] The waterjet propulsion system (100) further comprises a secondary
clutch driven housing (50). In an embodiment, a secondary clutch assembly (18) is
provided between the intermediate hub (17) and the secondary clutch driven
housing (50). The secondary clutch assembly (18) comprises a spring loaded thrust
bearing (30). The spring loaded thrust bearing (30) is configured to keep the
secondary clutch assembly (18) engaged by exerting spring force. When the
secondary clutch assembly (18) is engaged, the intermediate hub (17) and the
secondary clutch driven housing (50) are connected to each other.
[0051] In an embodiment, the secondary clutch assembly (18) is a wet type
multidisc friction clutch.
[0052] The waterjet propulsion system (100) further comprises an intermediate
gear (21) configured to be in contact with the secondary clutch driven housing (50).
The secondary clutch driven housing (50) defines internal gear teeth.
[0053] In an embodiment, the waterjet propulsion system (100) may comprise
a plurality of intermediate gears (21).
[0054] The waterjet propulsion system (100) further comprises a forward
driven gear (22) that may be in contact with the intermediate gear (21) and the

output shaft (33).
[0055] The waterjet propulsion system (100) further comprises a gear carrier
(23 configured to support the intermediate gear (21).
[0056] In an embodiment, the number of intermediate gears may depend on the
torque transmission requirement of the marine vessel.
[0057] The waterjet propulsion system (100) further comprises a synchromesh
gear assembly connected to the output shaft (33). The synchromesh gear assembly
consists of internally and externally splined synchronizer bush (25). The
synchronizer bush (25) is in contact with the reverse driven gear (26).
[0058] The synchronizer bush (25) has internal conical surface which mates
with an external conical surface on the main driven gear (13) when intended to be
pushed for engagement.
[0059] The waterjet propulsion system (100) further comprises a spring loaded
thrust bearing (31 connected to the synchronizer bush (25). The spring loaded thrust
bearing (31) is configured to keep the synchronizer bush (25) disengaged with the
main driven gear (13) by exerting spring force. The stopper (27) ensures
synchronizer bush (25) disengages from the conical surface of the main driven gear
(13) while retracting motion during disengagement.
NORMAL WORKING OF THE WATERJET PROPULSION SYSTEM 100
[0060] During the normal operation of the waterjet propulsion system (100),
the power is transmitted from the engine transmission to the input shaft (32). The
input shaft (32) rotates the main driving gear (20), which in turn rotates the main
driven gear (13). The main driven gear (13) is connected to the primary clutch driver
ring (14) and the primary clutch driver ring (14) remains connected to the primary
clutch driven ring (16). The primary clutch assembly (15) is provided between the
primary clutch driver ring (14) and the primary clutch driven ring (16).

[0061] The primary clutch assembly (15) and the secondary clutch assembly
(18) may remain engaged by means of spring force exerted by the spring loaded
thrust bearing (19) and the spring loaded thrust bearing (30) for the primary clutch
assembly (15) and the secondary clutch assembly (18) respectively. This connects
the primary clutch driver ring (14) to the primary clutch driven ring (16) and the
intermediate hub (17) to the secondary clutch driven housing (50).
[0062] The intermediate hub (17) free wheels on the output shaft (33) using the
hydrodynamic bearing (28) located at inner diameter. The intermediate hub (17)
also free wheels on the reverse driven gear (26) using the hydrodynamic bearing
(35).
[0063] As discussed above, as the secondary clutch assembly (18) is engaged,
the intermediate hub (17) and housing (50) forms one unit. The housing (50) meshes
with the intermediate gear (21). The intermediate gear (21) in turn meshes with the
forward driven gear (22) keyed to the output shaft (33). Thus, the output shaft (33)
rotates in the forward direction and propels the vessel forward.
REVERSING THE ROTATION OF THE OUTPUT SHAFT 33
[0064] During the normal working condition, the synchromesh gear assembly
is in disengaged position with the output shaft (33).
[0065] During the reverse operation of the waterjet propulsion system (100),
the oil supply pressure is increased. The high pressurized oil passed through the oil
supply port (24) of the output shaft (33) and fills the space between intermediate
hub (17) and synchromesh gear (26) to push them apart axially.
[0066] The intermediate hub (17) moves rightward against the spring force of
the spring loaded thrust bearing (19), causing the primary clutch assembly (15) and
the secondary clutch assembly (18) to disengage. This disengagement of the
primary clutch assembly (15) and the secondary clutch assembly (18) detaches the
forward driven gear (22) from the output shaft (33).

[0067] The synchromesh gear assembly moves leftward against the spring
force of spring loaded thrust bearing (31) causing the conical surfaces on
synchronizer bush (25) and main driving gear (13) to mate. Because of this mating
of the conical surfaces, the speed of the synchronizer bush (25) tends to attain the
speed of the main driving gear (20). The reverse driven gear (26) moves further
under the oil pressure and mates with the claws (34) on the main driven gear (13).
The power transmission now takes place from main driving gear (20), to the main
driven gear (13), to the claws (34), to the reverse driven gear (26) and to the output
shaft (33) with direction reversal. Thus, the output shaft (33) reverses it direction.
[0068] To stop the reverse rotation, the high pressure oil supply in the output
shaft (33) is reduced. This will retract the reverse driven gear (26) to the disengaged
position under the action of spring loaded thrust bearing (31). The stopper (27)
connected to reverse driven gear (26) ensures synchronizer bush (25) is also
disengaged from the conical surface of the main driven gear (13).
TECHNICAL ADVANTAGE
[0069] A waterjet propulsion system, which is Simple.
[0070] A waterjet propulsion system that rotates output shaft in either
direction.
[0071] A waterjet propulsion system serves the purpose efficiently.
[0072] Furthermore, each of the appended claims defines a separate invention,
which for infringement purposes is recognized as including equivalents to the
various elements or limitations specified in the claims. Depending on the context,
all references below to the “invention” may in some cases refer to certain specific
embodiments only. In other cases, it will be recognized that references to the
“invention” will refer to subject matter recited in one or more, but not necessarily
all, of the claims.
[0073] Groupings of alternative elements or embodiments of the invention

disclosed herein are not to be construed as limitations. Each group member can be
referred to and claimed individually or in any combination with other members of
the group or other elements found herein. One or more members of a group can be
included in, or deleted from, a group for reasons of convenience and/or
patentability. When any such inclusion or deletion occurs, the specification is herein
deemed to contain the group as modified thus fulfilling the written description of
all groups used in the appended claims.
[0074] Furthermore, those skilled in the art can appreciate that the terminology
used herein is for the purpose of describing particular embodiments only and is not
intended to be limiting of the present disclosure. It will be appreciated that several
of the above-disclosed and other features and functions, or alternatives thereof, may
be combined into other systems or applications. Various presently unforeseen or
unanticipated alternatives, modifications, variations, or improvements therein may
subsequently be made by those skilled in the art without departing from the scope
of the present disclosure as encompassed by the following claims.
[0075] The claims, as originally presented and as they may be amended,
encompass variations, alternatives, modifications, improvements, equivalents, and
substantial equivalents of the embodiments and teachings disclosed herein,
including those that are presently unforeseen or unappreciated, and that, for
example, may arise from applicants/patentees and others.
[0076] While the foregoing describes various embodiments of the present
disclosure, other and further embodiments of the present disclosure may be devised
without departing from the basic scope thereof. The scope of the present disclosure
is determined by the claims that follow. The present disclosure is not limited to the
described embodiments, versions or examples, which are included to enable a
person having ordinary skill in the art to make and use the invention when combined
with information and knowledge available to the person having ordinary skill in the
art.

WE CLAIM:
1. A waterjet propulsion system (100) for rotating output shaft (33) in either
direction, the system (1) comprising:
an input shaft (32) connected to an engine;
an output shaft (33) defining an oil supply port (24);
a main driving gear (20) is mounted on the input shaft (32);
a main driven gear (13) is mounted on the output shaft (33) using roller
bearings, wherein the main driving gear (20) meshes with the main driven
gear (13);
a primary clutch driver ring (14) and a primary clutch driven ring (16);
a primary clutch assembly (15) is provided between the primary clutch driver
ring (14) and the primary clutch driven ring (16);
an intermediate hub (17) is connected to the output shaft (33) using a
hydrodynamic bearing (28);
a secondary clutch driven housing (50);
a secondary clutch assembly (18) is provided between the intermediate hub
(17) and the secondary clutch driven housing (50);
a forward driven gear (22) in contact with the secondary clutch driven housing
(50) and the output shaft (33);
a reverse driven gear (26) is connected to the intermediate hub (17) using a
hydrodynamic bearing (35); and
a synchronizer bush (25) in contact with the reverse driven gear (26) and the
main driven gear (13).
2. The waterjet propulsion system (100) as claimed in claim 1, wherein the main
driven gear (13) comprises claws (34) on the outer surface, wherein the
reverse driven gear (26) is configured to mate with the claws (34) on the main
driven gear (13), wherein the primary clutch assembly (15) and the secondary
clutch assembly (18) is a wet type multidisc friction clutch.
3. The waterjet propulsion system (100) as claimed in claims 1-2, wherein,

the primary clutch assembly (15) comprises a spring loaded thrust bearing
(19), wherein the spring loaded thrust bearing (19) is configured to keep the
primary clutch assembly (15) engaged by exerting spring force; and
the secondary clutch assembly (18) comprises a spring loaded thrust bearing
(30), wherein the spring loaded thrust bearing (30) is configured to keep the
secondary clutch assembly (18) engaged by exerting spring force.
4. The waterjet propulsion system (100) as claimed in claims 1-3, wherein the
hydrodynamic bearing (28) is provided within the inner diameter of the
intermediate hub (17) for its consistent radial location during operation.
5. The waterjet propulsion system (100) as claimed in claims 1-4, comprising a
stopper (27) connected to the reverse driven gear (26).
6. The waterjet propulsion system (100) as claimed in claims 1-5, wherein the
primary clutch driven ring (16) is connected to the intermediate hub (17) by
means of a splined joint.
7. The waterjet propulsion system (100) as claimed in claims 1-6, comprising
an intermediate gear (21) configured to be in contact with the secondary
clutch driven housing (50), wherein the secondary clutch driven housing (50)
defines internal gear teeth, wherein the forward driven gear (22) is in contact
with the secondary clutch driven housing (50) using the intermediate gear(s)
(21).
8. The waterjet propulsion system (100) as claimed in claims 1-7, comprising a
gear carrier (23) configured for supporting the intermediate gear (21).
9. The waterjet propulsion system (100) as claimed in claims 1-8, wherein the
number of intermediate gear (21) is plurality in number and is dependent on
torque transmission requirement.

10. The waterjet propulsion system (100) as claimed in claims 1-9, comprising:
a synchromesh gear assembly connected to the output shaft (33); and
a spring loaded thrust bearing (31) connected to the synchronizer bush (25),
wherein the spring loaded thrust bearing (31) is configured to keep the
synchronizer bush (25) disengaged with the main driven gear (13) by exerting
spring force.