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Hydraulic Marine Gearbox With Integrated Neutral Gear Brake System

Abstract: HYDRAULIC MARINE GEARBOX WITH INTEGRATED NEUTRAL GEAR BRAKE SYSTEM The present invention relates to a hydraulic marine gearbox with an integrated neutral gear brake system, designed to prevent unintended propeller rotation when the gearbox is in neutral gear. The invention comprises a gearbox casing that houses multiple gear pairs and clutch packs, along with a hydraulic brake system integrated within the casing. The hydraulic brake system comprises a hydraulic cylinder block that receives lubricated oil pressure to actuate a brake disc mounted on an output coupling. This brake disc is configured to receive a frictional force from the hydraulic cylinder block, effectively halting propeller rotation. The neutral gear mechanism disengages the engine from the output shaft when in neutral, ensuring seamless operation and smooth transitions between gears. The hydraulic brake system utilizes existing hydraulic circuits within the gearbox, enhancing its functionality without requiring additional components

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Notices, Deadlines & Correspondence

Patent Information

Application #
Filing Date
31 December 2024
Publication Number
12/2025
Publication Type
INA
Invention Field
MECHANICAL ENGINEERING
Status
Email
Parent Application

Applicants

Ghatge Patil Industries Ltd
Uchgaon,Kolhapur-416005 Maharashtra, India

Inventors

1. Vijay Sankpal
Uchgaon, Kolhapur- 416005 Maharashtra, India
2. Rohan Potdar
Uchgaon, Kolhapur- 416005 Maharashtra, India
3. Rahul Patil
Uchgaon, Kolhapur- 416005 Maharashtra, India

Specification

Description:TECHNICAL FIELD
[001] The present invention generally relates to marine propulsion systems, and, more particularly, the present invention relates to a hydraulic marine gearbox with an integrated neutral gear brake system designed to prevent unintended propeller rotation when the gearbox is in neutral gear, thereby enhancing safety and operational efficiency in marine vessels.

BACKGROUND
[002] Marine gearboxes are essential components in fishing and commercial vessels, facilitating transitions between forward, reverse, and neutral gears. A significant issue arises when the gearbox is shifted to neutral, yet the propeller continues to rotate at low output torque. This unintended rotation can lead to fishing net entanglement, causing financial losses due to net damage, and poses safety hazards, including uncontrolled boat movement and potential accidents.
[003] The marine reduction gearbox disclosed in publication number EP0515650, incorporate variably engageable clutches and brakes to manage torque transmission between the prime mover and the propeller shaft. While these systems allow for partial torque transmission and prevent stalling during crash reversal procedures, they do not address the problem of propeller rotation in neutral gear. The focus remains on maintaining power output and operational efficiency rather than controlling residual rotational forces.
[004] The limitations of current marine gearboxes comprise the absence of an integrated mechanism to restrict propeller rotation in neutral gear. This deficiency results in fishing nets becoming entangled in propeller blades, leading to significant financial losses and safety risks. The lack of control over propeller motion in neutral gear increases the likelihood of accidents and injuries due to uncontrolled boat movement.
[005] In view of these challenges, there is a pressing need for a solution that effectively addresses the deficiencies of existing marine gearboxes. The Hydraulic Marine Gearbox with Integrated Neutral Gear Brake System aims to provide a technical solution to ensure safety and operational efficiency by controlling propeller rotation in neutral gear.

OBJECTS OF THE INVENTION
[006] The object of the invention is to provide a hydraulic marine gearbox with an integrated brake system that effectively prevents unintended propeller rotation when the gearbox is in neutral gear, thereby enhancing safety and operational control in marine vessels.
[007] Another object of the invention is to enhance safety by minimizing the risks of accidents and injuries associated with uncontrolled propeller movement, ensuring a safer environment for marine operations.
[008] Yet another object of the invention is to reduce damage to fishing nets and prevent associated financial losses by ensuring complete cessation of propeller rotation in neutral gear, thereby protecting marine equipment and investments.
[009] A further object of the invention is to ensure better operational control of marine vessels by providing a reliable and efficient solution for marine gearboxes that operates effectively under varying power and torque conditions.
[0010] An additional object of the invention is to eliminate uncontrolled propeller rotation by integrating a hydraulic brake system directly into the marine gearbox, ensuring that the propeller halts completely in neutral gear.
[0011] Another object of the invention is to improve operational reliability by ensuring efficient transitions between forward, reverse, and neutral gears without compromising safety, thereby enhancing the overall performance of marine vessels.
[0012] Yet another object of the invention is to provide cost efficiency by reducing financial losses associated with damaged fishing nets and enhancing the longevity of marine equipment through the use of a durable and integrated braking mechanism.
[0013] A further object of the invention is to offer ease of integration with a compact design that allows for seamless installation on various marine vessels without requiring extensive modifications, thereby facilitating widespread adoption and use.

SUMMARY
[0014] This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in limiting the scope of the claimed subject matter.
[0015] Embodiments of the present invention provide a marine gearbox comprising a hydraulic brake system integrated to halt the rotation of a propeller when the gearbox is in neutral gear. This integration ensures immediate cessation of propeller movement, enhancing safety during marine operations. The hydraulic brake system is actuated by lubricated oil pressure, which applies a frictional force to a brake disc mounted on the output coupling, effectively stopping the propeller rotation. This feature minimizes the risk of damage to the gearbox and propeller by preventing inadvertent rotation when the vessel is stationary, thereby improving the longevity of the marine propulsion system.
[0016] The design offers several advantages, including enhanced durability, ensuring that the components of the marine gearbox can withstand wear and tear over time, leading to a longer lifespan. The construction allows for efficient production processes that can reduce costs and improve scalability. The integration of the hydraulic brake system facilitates effective transfer of hydraulic pressure for reliable braking performance. The overall design contributes to stability, ensuring that the gearbox operates smoothly and consistently under various conditions without compromising performance. Additionally, the incorporation of flexible components allows for adaptability in design and functionality to meet diverse marine applications and requirements.
[0017] In accordance with an embodiment of the present invention, the gearbox further comprises a hydraulic brake system being actuated by lubricated oil pressure. Utilizing lubricated oil pressure to actuate the hydraulic brake system simplifies the design by using existing hydraulic circuits, reducing the need for additional components and potential points of failure. The use of lubricated oil pressure ensures consistent brake system performance, as the lubrication reduces wear and tear on the hydraulic components, leading to lower maintenance requirements and costs.
[0018] In accordance with an embodiment of the present invention, the gearbox further comprises a brake system including a brake disc mounted on the output coupling. The inclusion of a brake disc mounted on the output coupling allows for direct and efficient transfer of braking force to the propeller shaft, resulting in quicker and more reliable stopping of the propeller. This configuration facilitates easier access and maintenance of the brake system components, as they are located at the output coupling, which is a more accessible area of the gearbox.
[0019] In accordance with an embodiment of the present invention, the gearbox further comprises a brake disc that does not affect gear operations in forward or reverse gears. The design of the brake disc ensures that it does not interfere with gear operations in either forward or reverse gears, maintaining optimal propulsion efficiency and performance during navigation. By not affecting gear operations, the brake disc reduces the likelihood of mechanical stress and wear on the gearbox components, thereby enhancing the overall reliability and service life of the marine propulsion system.
[0020] In accordance with an embodiment of the present invention, the gearbox further comprises a brake disc designed to provide efficient braking without compromising durability. The brake disc is engineered to provide efficient braking, which translates to reduced stopping distances and improved control over the vessel's movement, particularly in emergency situations. The design focus on durability ensures that the brake disc can withstand the harsh marine environment and frequent usage without significant degradation, leading to reduced downtime and lower replacement costs over the lifespan of the gearbox.
[0021] In accordance with an embodiment of the present invention, the gearbox further comprises a neutral gear mechanism that disengages the engine from the output shaft in neutral gear. The inclusion of a neutral gear mechanism enhances safety by allowing the operator to disengage the engine from the output shaft, thereby preventing accidental propeller movement when the vessel is stationary or during engine start-up. The neutral gear mechanism provides a means for the operator to seamlessly transition between gears, contributing to smoother operation and reduced wear on the engine and transmission components.
[0022] In accordance with an embodiment of the present invention, the marine gearbox is integrated within a compact gearbox casing designed to accommodate the hydraulic brake system and other components. The compact gearbox casing design optimizes space utilization within the vessel's engine compartment, allowing for more efficient use of space and potentially reducing the overall size of the marine vessel. By integrating the hydraulic brake system within the same casing, the design simplifies the assembly process and reduces the number of separate components, which can enhance reliability and reduce maintenance requirements.
[0023] In accordance with an embodiment of the present invention, the marine gearbox is manufactured using casting, forging, and machining processes to ensure quality and performance. The use of casting, forging, and machining processes in manufacturing ensures that the gearbox components have high structural integrity and are capable of withstanding the harsh marine environment, leading to a longer service life. These manufacturing processes allow for precision in the creation of gearbox components, which can result in improved fit and finish, tighter tolerances, and ultimately, better overall performance of the gearbox.
[0024] In accordance with an embodiment of the present invention, a method of preventing unintended propeller movement in marine vessels comprises integrating a hydraulic brake system within a gearbox to halt propeller rotation in neutral gear. Integrating a hydraulic brake system within the gearbox to halt propeller rotation in neutral gear significantly increases safety by preventing unintended propeller movement, which could lead to injury or damage to the vessel. The hydraulic brake system provides immediate response to operator inputs, ensuring that the propeller can be quickly and effectively stopped, when necessary, thus offering greater control over the vessel's movements.
[0025] In accordance with an embodiment of the present invention, the method further comprises testing the hydraulic brake system for proper actuation and efficient braking in neutral gear. Testing the hydraulic brake system for proper actuation ensures that the system is reliable and will perform as expected in critical situations, providing peace of mind to the operator and enhancing the safety of the vessel. Efficient braking in neutral gear as a result of thorough testing translates to reduced mechanical stress on the gearbox and propeller shaft, which can contribute to lower maintenance costs and extended equipment lifespan.
[0026] The present disclosure pertains to a hydraulic marine gearbox (100) featuring an integrated neutral gear brake system. This system comprises a gearbox casing (101) designed to contain multiple gear pairs (102) and clutch packs (103). Additionally, it incorporates a hydraulic brake system (104) embedded within the gearbox casing (101), utilizing a hydraulic cylinder block (105) that can accept lubricated oil pressure.
[0027] The design may also encompass a brake disc (106) affixed to an output coupling (107), which is intended to receive a frictional force from the hydraulic cylinder block (105) to stop the rotation of the propeller. Furthermore, there exists a neutral gear mechanism (108) that disengages the engine (109) from the output shaft (110) when the gearbox is set to neutral. In certain embodiments, the hydraulic brake system (104) is activated by lubricated oil pressure when the gearbox is shifted to neutral, which applies a frictional force to the brake disc (106) to avert any unintended propeller motion.
[0028] The brake disc (106) is constructed from materials adept at enduring harsh marine conditions and repetitive use. The gearbox casing (101) is optimally designed to hold all components within a small form factor. In some cases, the hydraulic brake system (104) is configured for seamless operation within the gearbox. Moreover, the neutral gear mechanism (108) allows for smooth transitions among forward, reverse, and neutral gear settings.
[0029] In certain configurations, the hydraulic cylinder block (105) is designed to exert the frictional force on the brake disc (106) exclusively when the gearbox is in neutral. The brake disc (106) is connected to the output coupling (107) for a direct and efficient transfer of braking power to the propeller shaft. The hydraulic brake system (104) may also make use of existing hydraulic circuits within the gearbox, with components potentially manufactured through casting, forging, and machining methods for optimal quality and performance.
[0030] Additionally, the present disclosure comprises a method for preventing unintentional propeller rotation in a marine vessel, which entails shifting a hydraulic marine gearbox (100) into neutral gear, engaging a hydraulic brake system (104) with lubricated oil pressure, applying a frictional force on a brake disc (106) mounted to an output coupling (107), and halting propeller rotation by disengaging the engine (109) from the output shaft (110) via the neutral gear mechanism (108).
[0031] In some embodiments, the hydraulic brake system (104) is integrated within the gearbox casing (101) for consistent operation. The marine gearbox (100) is designed with a hydraulic brake system (104) to stop propeller rotation when in neutral gear, actuated by lubricated oil pressure, and features a brake disc (106) mounted on an output coupling (107). The configuration ensures that the brake disc (106) does not interfere with the functioning of the gearbox in forward or reverse settings. The design of the brake disc (106) is aimed at providing effective braking without sacrificing durability. The marine gearbox (100) may thus comprise a neutral gear mechanism (108) that decouples the engine (109) from the output shaft (110) in neutral gear, all housed within a compact gearbox casing (101) that accommodates both the hydraulic brake system (104) and other components.
[0032] The marine gearbox (100) claims to utilize manufacturing techniques like casting, forging, and machining to guarantee functional integrity. The methods described herein also encompass approaches to prevent unwanted propeller movement in marine vessels, including the implementation of the hydraulic brake system (104) within a gearbox (100) to halt propeller rotation while in neutral gear, along with testing procedures to verify the brake system's effectiveness during neutral gear operation.

BRIEF DESCRIPTION OF DRAWINGS
[0033] The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identify the figure in which the reference number first appears. The same numbers are used throughout the drawings to refer like features and components.
[0034] Figure 1a, is a block diagram illustrating a hydraulic marine gearbox, in accordance with an exemplary embodiment of the present disclosure;
[0035] Figure 1b, illustrates a hydraulic marine gearbox in accordance with an exemplary embodiment of the present disclosure; and
[0036] Figure 2, is a flowchart illustrating a method for preventing unintended propeller rotation in a marine vessel in accordance with an exemplary embodiment of the present disclosure.

DETAILED DESCRIPTION
[0037] Some embodiments of the present disclosure, illustrating all its features, will now be discussed in detail. It must also be noted that as used herein and in the appended claims, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise.
[0038] The present invention relates to a hydraulic marine gearbox with an integrated brake system, designed to halt the rotation of a propeller when the gearbox is in neutral gear. This invention addresses the need for enhanced safety and operational control in marine vessels by preventing unintended propeller movement. The integration of a hydraulic brake system within the gearbox ensures immediate cessation of propeller rotation, thereby minimizing risks of accidents and damage to marine equipment.
[0039] The invention comprises a hydraulic brake system actuated by lubricated oil pressure, which applies a frictional force to a brake disc mounted on the output coupling. This system is seamlessly integrated within a compact gearbox casing, which houses gear pairs, clutch packs, and the brake mechanism. The neutral gear mechanism disengages the engine from the output shaft, ensuring that power transmission to the propeller is halted when the gearbox is in neutral gear. The novelty of the invention lies in its ability to eliminate uncontrolled propeller rotation, thereby enhancing safety and operational reliability.
[0040] In one embodiment, the hydraulic brake system comprises a hydraulic cylinder block configured to receive lubricated oil pressure. The hydraulic cylinder block is designed to apply a frictional force to the brake disc, effectively halting the propeller rotation. The brake disc is mounted on the output coupling, allowing for direct and efficient transfer of braking force to the propeller shaft. The brake disc is constructed from materials capable of withstanding the harsh marine environment and frequent usage, ensuring durability and longevity.
[0041] The gearbox casing is designed to accommodate all components within a compact structure, optimizing space utilization within the vessel's engine compartment. The casing is manufactured using casting, forging, and machining processes, ensuring high structural integrity and performance. The hydraulic brake system operates seamlessly with the gearbox, utilizing existing hydraulic circuits to reduce the need for additional components and potential points of failure.
[0042] The neutral gear mechanism facilitates smooth transitions between forward, reverse, and neutral gears. When the gearbox is shifted to neutral gear, the hydraulic brake system is actuated by the lubricated oil pressure, applying the frictional force to the brake disc to prevent unintended propeller rotation. This mechanism enhances safety by allowing the operator to disengage the engine from the output shaft, preventing accidental propeller movement when the vessel is stationary or during engine start-up.
[0043] In an embodiment of the present invention, the brake disc is designed to provide efficient braking without compromising durability. The design focus on durability ensures that the brake disc can withstand the harsh marine environment and frequent usage without significant degradation, leading to reduced downtime and lower replacement costs over the lifespan of the gearbox. The brake disc does not affect gear operations in forward or reverse gears, maintaining optimal propulsion efficiency and performance during navigation.
[0044] The present disclosure encompasses a hydraulic marine gearbox equipped with a built-in neutral gear brake system. This gearbox features a casing that houses various gear pairs and clutch assemblies. It also integrates a hydraulic brake system within the casing, comprising a hydraulic cylinder block that operates using lubricated oil pressure.
[0045] Additionally, the design may comprise a brake disc mounted on an output coupling, allowing it to receive a frictional force from the hydraulic cylinder block to stop the propeller from rotating. A neutral gear mechanism is also part of the design, which serves to disengage the engine from the output shaft when the gearbox is in neutral. In certain configurations, the hydraulic brake system engages via lubricated oil pressure when the gearbox is shifted into neutral, thus applying frictional force to the brake disc and preventing any unintended propeller movement.
[0046] The brake disc may be fabricated from materials specifically designed to endure the challenging conditions of a marine environment and frequent use. Moreover, the gearbox casing is designed to house all components within a compact form factor.
[0047] In particular embodiments, the hydraulic brake system functions in harmony with the gearbox. The neutral gear mechanism allows for smooth transitions between forward, reverse, and neutral positions. Additionally, the hydraulic cylinder block is capable of applying frictional force to the brake disc only when the gearbox is set to neutral.
[0048] The brake disc is positioned on the output coupling, enabling efficient and direct transfer of braking force to the propeller shaft. The hydraulic brake system may utilize the existing hydraulic circuits within the gearbox. Moreover, the components may be produced through casting, forging, and machining techniques to ensure durability and performance.
[0049] The present disclosure also comprises a method for preventing unintended propeller rotation in a marine vessel. This method comprises shifting the hydraulic marine gearbox into neutral, activating the hydraulic brake system through lubricated oil pressure, applying frictional force to a brake disc on the output coupling, and stopping propeller rotation by disengaging the engine from the output shaft using the neutral gear mechanism. The hydraulic brake system is seamlessly integrated within the gearbox casing, coordinating with other components effectively.
[0050] Furthermore, the marine gearbox incorporates a hydraulic brake system that halts propeller rotation when in neutral gear. This system can be activated by lubricated oil pressure and incorporates a brake disc mounted on the output coupling, which does not interfere with gear operations in either forward or reverse gears while providing efficient braking without sacrificing durability.
[0051] The marine gearbox is designed with a neutral gear mechanism that disengages the engine from the output shaft in neutral, all within a compact gearbox casing that accommodates the hydraulic brake system and its components. The construction employs techniques such as casting, forging, and machining to ensure high quality and reliable performance. Lastly, the method may involve integrating the hydraulic brake system within a gearbox to prevent unintended propeller movement in marine vessels, which comprises testing the hydraulic brake system for effective actuation and efficient performance while in neutral gear.
[0052] This present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate corresponding parts in the various figures. These reference numbers are shown in bracket in the following description below:
• Hydraulic Marine Gearbox (100)
• Gearbox Casing (101)
• Plurality Of Gear Pairs (102)
• Clutch Packs (103)
• Hydraulic Brake System (104)
• Hydraulic Cylinder Block (105)
• Brake Disc (106)
• Output Coupling (107)
• Neutral Gear Mechanism (108)
• Engine (109)
• Output Shaft (110)
[0053] The block diagram illustrated in Figure 1 outlines the structure of a hydraulic marine gearbox 100, featuring various innovative elements according to certain embodiments of this disclosure. This hydraulic marine gearbox 100 may encompass multiple or one or more gear pairs (102) and clutch assemblies (103), alongside an integrated hydraulic brake system (104) within the gearbox casing (101). It also comprises a neutral gear mechanism (108), which is designed to disengage the engine (109) from the output shaft (110) when the gearbox 100 is set to neutral gear. The system integrates a brake disc (106) that is affixed to an output coupling (107), configured to receive a frictional force from the hydraulic cylinder block (105) to stop the rotation of the propeller.
[0054] The hydraulic brake system (104) is engineered to utilize lubricated oil pressure to activate the braking mechanism when the gearbox 100 is shifted into neutral, thereby applying a frictional force to the brake disc (106) and preventing any unintended propeller movement. The brake disc (106) is constructed from materials suitable for enduring harsh marine conditions and frequent operation. Additionally, the gearbox casing (101) is designed to house all components within a compact framework.
[0055] In certain embodiments, the hydraulic brake system (104) operates in harmony with the gearbox 100. The neutral gear mechanism (108) ensures seamless transitions among forward, reverse, and neutral gear states. The hydraulic cylinder block (105) is designed to exert the frictional force on the brake disc (106) exclusively when the gearbox 100 is in neutral. Furthermore, the brake disc (106) is attached to the output coupling (107) to facilitate an efficient transfer of braking force to the propeller shaft. The hydraulic brake system (104) leverages existing hydraulic circuits within the gearbox 100, and the components of the gearbox may be produced through casting, forging, and machining techniques.
[0056] In another exemplary aspect of the present disclosure the hydraulic brake system (104) may be actuated by lubricated oil pressure. In some embodiments, the brake system may comprise a brake disc (106) mounted on the output coupling (107). In some embodiments, the brake disc (106) does not affect gear operations in forward or reverse gears. In some embodiments, the brake disc (106) may be designed to provide efficient braking without compromising durability. In some embodiments, integrated within a compact gearbox casing (101) designed to accommodate the hydraulic brake system (104) and other components. In some embodiments, manufactured using casting, forging, and machining processes to ensure quality and performance.
[0057] Figure 2 illustrates a flowchart outlining a method designed to prevent accidental rotation of the propeller in a marine vessel, according to certain embodiments of the disclosed invention. Initially, at step 210, the process involves shifting the hydraulic marine gearbox (100) into neutral. Following this, at step 220, a hydraulic brake system (104) is activated utilizing pressurized lubricated oil. Step 230 entails the application of a frictional force onto a brake disc (106) that is affixed to an output coupling (107). At step 240, the method involves stopping the propeller's movement by disengaging the engine (109) from the output shaft (110) utilizing a neutral gear mechanism (108). The hydraulic brake system (104) is integrated within the gearbox casing (101), allowing for seamless operation alongside the gearbox. In addition, at step 250, the method comprises further integration of the hydraulic brake system (104) within the gearbox (100) to effectively halt propeller rotation while the gearbox is in neutral.
[0058] The advantage of the present disclosure, discloses eliminating uncontrolled propeller motion, enhancing operational safety and reliability, and reducing financial losses from damaged fishing nets. The integration of the hydraulic brake system provides a robust and efficient marine gearbox solution, ensuring better operational control of marine vessels under varying power and torque conditions. The compact design allows for seamless installation on various marine vessels without extensive modifications, contributing to cost efficiency and ease of integration.
[0059] The foregoing objects of the invention are accomplished and the problems and shortcomings associated with prior art techniques and approaches are overcome by the present invention described in the present embodiment. Detailed descriptions of the preferred embodiment are provided herein; however, it is to be understood that the present invention may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching one skilled in the art to employ the present invention in virtually any appropriately detailed system, structure, or matter. The embodiments of the invention as described above and the methods disclosed herein will suggest further modification and alterations to those skilled in the art. Such further modifications and alterations may be made without departing from the scope of the invention. , Claims:We claim:

1. A hydraulic marine gearbox (100) with an integrated neutral gear brake system, comprising:
a gearbox casing (101) configured to house one or more of gear pairs (102), and a clutch packs (103);
a hydraulic brake system (104) integrated within the gearbox casing (101), the hydraulic brake system comprising a hydraulic cylinder block (105) configured to receive lubricated oil pressure;
a brake disc (106) mounted on an output coupling (107), the brake disc configured to receive a frictional force from the hydraulic cylinder block (105) to halt propeller rotation; and
a neutral gear mechanism (108) configured to disengage an engine (109) from an output shaft (110) when the gearbox is in neutral gear;
wherein the hydraulic brake system (104) is actuated by the lubricated oil pressure when the gearbox is shifted to neutral gear, applying the frictional force to the brake disc (106) to prevent unintended propeller rotation.

2. The hydraulic marine gearbox (100) as claimed in claim 1, wherein the brake disc (106) is constructed from materials capable of withstanding a harsh marine environment and frequent usage.
3. The hydraulic marine gearbox (100) as claimed in claim 1, wherein the gearbox casing (101) is designed to accommodate all components within a compact structure.
4. The hydraulic marine gearbox (100) as claimed in claim 1, wherein the hydraulic brake system (104) is configured to operate seamlessly with the gearbox.
5. The hydraulic marine gearbox (100) as claimed in claim 1, wherein the neutral gear mechanism (108) facilitates smooth transitions between forward, reverse, and neutral gears.
6. The hydraulic marine gearbox (100) as claimed in claim 1, wherein the hydraulic cylinder block (105) is configured to apply the frictional force to the brake disc (106) only when the gearbox is in neutral gear.
7. The hydraulic marine gearbox (100) as claimed in claim 1, wherein the brake disc (106) is mounted on the output coupling (107) to allow direct and efficient transfer of braking force to a propeller shaft.
8. The hydraulic marine gearbox (100) as claimed in claim 1, wherein the hydraulic brake system (104) utilizes existing hydraulic circuits within the gearbox.
9. The hydraulic marine gearbox (100) as claimed in claim 1, wherein the gearbox components are manufactured using casting, forging, and machining processes.
10. A method for preventing unintended propeller rotation in a marine vessel, comprising:
Shifting 210 a hydraulic marine gearbox (100) to neutral gear;
actuating 220 a hydraulic brake system (104) using lubricated oil pressure;
applying 230 a frictional force to a brake disc (106) mounted on an output coupling (107); and
halting 240 propeller rotation by disengaging an engine (109) from an output shaft (110) through a neutral gear mechanism (108);
wherein the hydraulic brake system (104) is integrated within the gearbox casing (101) and operates seamlessly with the gearbox.
11. The method as claimed in claim 10, comprises integrating the hydraulic brake system (104) within the gearbox (100) to effectively halt propeller rotation while the gearbox is in neutral

Dated this on 30th day of December, 2024

Prafulla Wange
(Agent for the applicant)
(IN/PA-2058)

Documents

Application Documents

# Name Date
1 202421104964-PROOF OF RIGHT [31-12-2024(online)].pdf 2024-12-31
2 202421104964-POWER OF AUTHORITY [31-12-2024(online)].pdf 2024-12-31
3 202421104964-FORM 1 [31-12-2024(online)].pdf 2024-12-31
4 202421104964-DRAWINGS [31-12-2024(online)].pdf 2024-12-31
5 202421104964-COMPLETE SPECIFICATION [31-12-2024(online)].pdf 2024-12-31
6 Abstract1.jpg 2025-02-19
7 202421104964-FORM-9 [17-03-2025(online)].pdf 2025-03-17
8 202421104964-FORM 18 [17-03-2025(online)].pdf 2025-03-17