DESC:FORM 2


THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003


COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
HYBRID STABILIZER SYSTEM FOR HEAVY DUTY TRUCK TO STABILIZE
RECOIL FORCES

Applicant:
BEML Limited
A company Incorporated in India under the Companies Act, 1956
Having address:
BEML Soudha, 23/1, 4th Main, Sampangirama Nagar,
Bengaluru - 560 027, Karnataka, India

The following specification particularly describes the invention and the manner in which it is to be performed.

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present invention claims priority from Indian patent application numbered IN 202041022806 filed on 30th May 2020.
TECHNICAL FIELD
[002] The present subject matter relates to hybrid stabilizer system for heavy duty truck, and more specifically it relates to hybrid stabilizer system to sustain recoil forces of a weapon system mounted on a vehicle.
BACKGROUND
[003] The emerging trend in today's battlefield is to employ a rapid deployment force, which is lighter more lethal and less dependent on logistic tails. A highly agile and capable force must be sufficiently versatile to sustain a high operating tempo and defeat the opponent with minimum losses. They must then quickly re-position, re-focus end execute subsequent missions against an opponent by employing asymmetric means. Vehicles mounted with weapon system play a very important role in the real competent world with tactical mobility in actual field conditions. Mobility is normally associated with getting the equipment to the site. The mounted weapon system are placed on a heavy duty truck for tactical mobility.
[004] Hydraulically operated Stabilizer system is integrated on the base vehicle exclusively to withstand and dissipate the huge dynamic recoil forces. Efficient utilization of hydraulic power facilitated to operate stabilizer hydraulics with required anchorage, recovery winch hydraulics within the powerline capacity limits. The stabilizer needs to be designed considering the structural space, hydraulic parameters, weapon recoil forces, terrain operation, powering of stabilizer hydraulic system from main engine, in case of main engine failure the stabilizer hydraulic system also to be powered from auxiliary power pack. Therefore, there is a need for state of art hybrid stabilizer for a mounted weapon system on a heavy duty truck.
OBJECTS OF THE INVENTION
[005] Main object of the present invention is to provide a heavy duty truck with hybrid stabilizer to sustain recoil forces while operating a weapon system.
[006] Another object of the present invention is that the stabilizer can be raised during transportation position and when stabilizer is in deployed mode position it acts as balancing and supporting medium for mounted weapon system.
SUMMARY
[007] Before the present system and method are described, it is to be understood that this application is not limited to the particular machine or an apparatus, and methodologies described, as there can be multiple possible embodiments that are not expressly illustrated in the present disclosure. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related to, hybrid stabilizer system for heavy duty truck, and more specifically it relates to hybrid stabilizer system to sustain recoil forces of a weapon system mounted on a vehicle and the aspects are further elaborated below in the detailed description. This summary is not intended to identify essential features of the proposed subject matter nor is it intended for use in determining or limiting the scope of the proposed subject matter.
In present implementation, hybrid stabilizer system has been worked out considering the operational difficulties of resisting the weapon recoil forces, vehicle space and performance capabilities. This system will facilitate empowering and improving the productivity of vehicles with mounted weapon system, the life of hydraulic aggregates which will result in reducing the machine down time which will further help to increase the machine productivity.
BRIEF DESCRIPTION OF THE DRAWINGS
[008] The foregoing summary, as well as the following detailed description of embodiments, is better understood when read in conjunction with the appended drawing. For the purpose of illustrating the disclosure, there is shown in the present document example constructions of the disclosure, however, the disclosure is not limited to the specific methods and apparatus disclosed in the document and the drawing:
[009] The detailed description is described with reference to the accompanying figure. In the figure, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawing to refer like features and components.
[010] Figure 1a illustrates side view of heavy duty truck with stabilizer on rear side in stowed position.
[011] Figure 1b illustrates side view of heavy duty truck with stabilizer on rear side in working position.
[012] Figure 2 illustrates an isometric view of a support structure of stabilizer.
[013] Figure 3 illustrates an isometric view of a hydraulic tank and its connection.
[014] Figure 4 illustrates assembly of main pump of stabilizer system.
[015] Figure 5 illustrates assembly of auxiliary pump of stabilizer system.
[016] Figure 6 illustrates load sensing control block for stabilizer system

[017] Figure 7 illustrates counterbalance valve, which will facilitate load holding of stabilizer.
[018] Figure 8 illustrates the testing of a hydraulic system.
[019] Figure 9 illustrates block diagram of stabilizer hydraulic system in embodiment of the present invention.
[020] The figure depicts various embodiments of the present disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following discussion that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION
[021] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising", “having”, and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. Although any systems and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, systems and methods are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[022] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure is not intended to be limited to the embodiments illustrated, but is to be accorded the widest scope consistent with the principles and features described herein.
[023] The present subject matter discloses a heavy duty truck (100) with hybrid stabilizer (120) to sustain recoil forces while operating a mounted weapon system. The objective is to develop a compact hybrid stabilizer(120) meeting the adverse operating conditions within the available constrained space, international cleanliness requirements, in accordance with an embodiment of the present invention.
[024] Stabilizer (120) is hydraulically actuated with the help of two hydraulic cylinders (124). Stabilizer hydraulic system is operated in open cycle configuration. The hydraulic system is incorporated with load sensing variable displacement pumps, proportional control valves & filtration systems to actuate, control and drive the individual operations. Stabilizer system is equipped with hydraulic actuators coupled with load holding valves.
[025] Stabilizer (120) is designed to be operated in two positions. In transportation mode, stabilizer will be raised up to provide sufficient departure angle to enable the vehicle to negotiate terrains in transit. In deployed mode, stabilizer is positioned so as to provide sufficient anchorage to balance and support the complete mounted weapon system (110). The shock loads generated from the weapon recoil is transferred to the trunnion eye. Kinematics of the stabilizer (120) is designed so to ensure the load path from the trunnion to the ground.
[026] Stabilizer structure (122) has been designed considering the weapon recoil forces, linkage kinematics, vehicle space availability, vehicle operational requirements and ensure vehicle equilibrium during weapon firing for various orientations of weapon barrel, stabilizer (120) will be hydraulically actuated using two hydraulic cylinders (124) in controlled manner with the help of counterbalance valve (180) - load holding valves.
[027] Counterbalance valve (180) will facilitate load holding during stabilizer deployed and transportation condition. Every actuator is equipped with counterbalance valves (180) to ensure load holding feature. They provide the much required support to lift the vehicle (100) above the ground and ensure the rear axle tyres are lifted during firing and ensure outrigger structure provides load path to dissipate the recoil forces to ground in accordance with an embodiment of the present invention. Telescopic legs to ensure adjustable leg length based on the depth of soil penetration to provide much required anchorage in loose soil.
[028] Hydraulic system is equipped with load sensing valve (170) to ensure operation of multiple open cycle aggregates hydraulically powered by auxiliary power source.
[029] In case of failure of vehicle engine, stabilizer hydraulics is designed to be powered alternately from auxiliary power pack.
[030] This invention describes design of hybrid stabilizer (120) for mounted weapon system (110) project on heavy duty truck (100) and the system parameters are experimentally measured bench marked with the theoretical values upon successful full load operation of mounted weapon system.
[031] Figure 1 (a & b) illustrates a functional block diagram depicting operation kinematics of stabilizer: Provide definite load path to dissipate the weapon recoil forces to ground. Actuator hinge points located so as to facilitate load path and ensure actuation of stabilizer (deploy / retract). Optimum utilization of space and weight. Ensure vehicle equilibrium during weapon firing for various orientations of weapon barrel, in accordance with an embodiment of the present invention.
[032] Figure 2 illustrates stabilizer structure (122) is of fabricated design, positioning and sizing of stabilizer hinges so as to provide definite support for the structure, telescopic legs to ensure adjustable leg length based on the depth of soil penetration to provide much required anchorage in loose soil, in accordance with an embodiment of the present invention.
[033] Figure 3 illustrates hydraulic tank (140) is equipped with return line filters with clog indicators, suction strainers, gauges for monitoring the oil temperature, oil level (or sight gauge). Facility for carrying out maintenance operations. Bottom gradients with drain ports. Breathing cum filling arrangement in accordance with an embodiment of the present invention.
[034] Figure 4 illustrates main pump (150), flow rate: 155 liters per minute, working pressure:200 bar, variable pump with axial piston, swash plate design for hydrostatic drives in open circuit. The flow is proportional to the drive speed and the displacement. Suitable built in pump output control device equipped with pressure & flow control, in accordance with an embodiment of the present invention.
[035] Figure 5 illustrates assembly auxiliary pump (160), flow rate: 73 liters per minute, working pressure: 200 bar, variable pump with axial piston, swash plate design for hydrostatic drives in open circuit. The flow is proportional to the drive speed and the displacement. Suitable built in pump output control device equipped with pressure & flow control in accordance with an embodiment of the present invention.
[036] Figure 6 illustrates load sensing control block (170), directional valves are proportional valves that can be operated according to the load-sensing principle. Built in pressure relief valve to control the position of the main spool with internal pilot oil supply. Built in pressure compensator to compensate pressure changes at the actuators or at the pump. Control valve is of compact design with internal LS unloading. Spools are equipped with pressure compensator for flow rates up to 150 l/min input flow from the pumps. Control valve is of sandwich plate design. Control valve bank is equipped with five spools, inlet element, end element variable pump with axial piston, swash plate design for hydrostatic drives in open circuit in accordance with an embodiment of the present invention.
[037] Figure 7 Counterbalance valve (180), counterbalance valve (180) will facilitate load holding during stabilizer deployed and transportation condition. Stabilizer structure is equipped with stabilizer cylinders for deployment. Every actuator is equipped with counterbalance valves (180) to ensure load-holding feature. They provide the much-required support to lift the vehicle above the ground and ensure the rear axle tyres are lifted during firing and ensure outrigger structure provides load path to dissipate the recoil forces to ground in accordance with an embodiment of the present invention.
[038] Figure 8 illustrates integration, testing (190) and commissioning of hydraulic system. Individual system performance was benchmarked with the design requirements in accordance with an embodiment of the present invention.
REFERENCE NUMERALS
Element Description Reference Numeral
Heavy Duty Truck 100
Mounted weapon system 110
Stabilizer 120
Stabilizer structure 122
Stabilizer cylinder 124
Hydraulic Tank 140
Main Pump 150
Auxiliary Pump 160
Load sensing valve 170
Counterbalance valve 180
Testing Rig 190
,CLAIMS:1. A hybrid stabilizer system (120) for heavy duty truck (100) to stabilize recoil forces comprises;
atleast one stabilizer structure (122) configured with telescopic legs to stabilize recoil forces,
atleast one stabilizer cylinder (124),
atleast one pump (150) configured to actuate the stabilizer (120),
atleast one hydraulic tank (140) configured to store hydraulic fluid and
atleast one counterbalance valve (180) configured to hold load and
mounted weapon system (110).

2. The hybrid stabilizer system (120) for heavy duty truck (100) to stabilize recoil forces as claimed in claim 1, wherein said stabilizer (120) is configured to transfer the load path of recoil forces from the trunnion to the ground.
3. The hybrid stabilizer system (120) for heavy duty truck (100) to stabilize recoil forces as claimed in claim 1, wherein said stabilizer (120) is configured to be raised during transportation mode and configured to provide anchorage to balance and support the mounted weapon system in deployed mode.
4. The hybrid stabilizer system (120) for heavy duty truck (100) to stabilize recoil forces as claimed in claim 1, wherein said counterbalance valve (180) is configured to facilitate the holding of load during stabilizer deployed and transportation mode.
5. The hybrid stabilizer system (120) for heavy duty truck (100) to stabilize recoil forces as claimed in claim 1, wherein said hydraulic tank (140) is equipped with return line filters with clog indicators, suction strainers, gauges for monitoring the oil temperature and oil level.
6. The hybrid stabilizer system (120) for heavy duty truck (100) to stabilize recoil forces as claimed in claim 1, wherein said stabilizer structure (122) is configured from fabrication, by positioning and sizing of stabilizer hinges with telescopic legs to provide anchorage in loose soil.
7. The hybrid stabilizer system (120) for heavy duty truck (100) to stabilize recoil forces as claimed in claim 1, wherein said counterbalance valves (180) are configured to provide the support to lift the vehicle (100) and the rear axle tyres above the ground during firing to dissipate the recoil forces to ground.
8. The hybrid stabilizer system (120) for heavy duty truck (100) to stabilize recoil forces as claimed in claim 1, wherein said load sensing valve (170) is configured to operate the hydraulic systems by auxiliary power source.
9. The hybrid stabilizer system (120) for heavy duty truck (100) to stabilize recoil forces as claimed in claim 1, wherein said main pump (150) and auxiliary pump (160) are variable pump with axial piston configured with working pressure of 200 bar and flow rate of 155 liters per minute and 73 liters per minute respectively.
10. The hybrid stabilizer system (120) for heavy duty truck (100) to stabilize recoil forces as claimed in claim 1, wherein said hydraulic stabilizer (120) is configured to be powered alternately from auxiliary power pack on failure of vehicle engine.