Solar-assisted motor drive system for distributed mechanical power supply

Abstract

The Company provides a solar-assisted motor drive system for distributed mechanical power supply. The solar-assisted motor drive system (100) integrates a thermally responsive actuator (102a), a crankshaft linkage assembly (104), a torque compound transmission mechanism (106), a torsional vibration isolator (110), and a dual spider differential into a single structural load-transmitting enclosure. The crankshaft linkage assembly is operatively coupled to the thermally responsive actuator and converts reciprocating motion into rotational torque. The torque compound transmission mechanism comprises a multi-stage planetary gear train. A differential torque balance assembly is connected to the output carrier shaft and configured to redistribute the combined torque in response to instantaneous mechanical resistance between multiple distributed load shafts (108a). Solar thermal energy is converted directly into reciprocating motion within the actuator, which is then converted to continuous rotational motion by the crankshaft and flywheel.

Description

[Technical Field]

[0001] This invention relates to a hybrid mechanical drive system that integrates solar thermal energy conversion and electromechanical power transmission. More specifically, it relates to a solar-assisted motor drive system that provides distributed mechanical power to multiple load shafts, achieving real-time torque compounding and dynamic load balancing, suitable for use in rural microgrids, irrigation drives, machining systems, and sustainable distributed power networks. [Background technology]

[0002] Traditional motor-driven mechanical power distribution systems rely heavily on electronic or hydraulic feedback mechanisms to adjust torque and load balance. These systems typically exhibit low energy efficiency, high maintenance costs, and vulnerability to operational failures due to complex sensor and actuator dependencies. Furthermore, efforts to integrate renewable energy sources, particularly solar energy, into these systems have primarily focused on electrical coupling, not mechanical coupling.

[0003] Existing solar-powered mechanical actuators suffer from limited ability to drive distributed loads in real time without electrical buffering or conversion stages and low torque continuity. Therefore, there is a need for a mechanically integrated solar assistance system that integrates solar-powered mechanical torque with traditional motor drives to efficiently balance distributed loads and maintain continuous operation under fluctuating solar radiation.

[0004] The evolution of hybrid powertrain systems has long been driven by the need for improved energy efficiency, reliability, and adaptability in diverse industrial and distributed machinery environments. Traditional mechanical drive systems, powered solely by electric motors or internal combustion engines, have provided the foundation for industrial automation, manufacturing, and transportation for over a century. However, as the global energy system transitions toward sustainability and renewable energy integration, these traditional systems face significant challenges, including energy waste, grid dependency, and inefficient operation under variable load conditions. Particularly in rural and off-grid environments where a stable power supply is unreliable, there is a growing need for systems that can directly integrate renewable energy sources, such as solar photovoltaics, into mechanical drive configurations without the complexities and energy losses inherent in the electrical conversion process.

[0005] Existing mechanical power systems rely heavily on motor-driven shafts, typically configured to transmit torque via belts, gear trains, or hydraulic couplings. While these systems can provide significant mechanical energy, they rely on electrical input derived from fossil fuel-based power generation or battery storage systems. When integrating renewable energy sources such as solar energy, a common approach is photovoltaic (PV) conversion, converting sunlight into electrical energy to charge batteries or drive electric motors. This dual conversion path (solar → electrical, electrical → mechanical) introduces multiple inefficiencies, including conversion losses, inverter inefficiencies, and battery degradation. Cumulative energy losses in these stages typically exceed 20–30%, reducing the overall practicality of solar-assisted drive systems for continuous mechanical applications. Furthermore, these electrically integrated solar systems require complex electronic controllers, sensors, and feedback technologies to synchronize the input source, increasing system costs and maintenance costs due to wear and calibration issues on electronic components.

[0006] To improve upon conventional systems, several hybrid motor technologies have been proposed, including electro-hydraulic hybrid drives and mechanically coupled hybrid gear assemblies. Electro-hydraulic hybrids use electrical energy to drive a hydraulic pump, which in turn moves a mechanical actuator. While these designs can generate high torque, they are limited by the inefficiencies of fluid compression and the need to continuously maintain pressure, which results in heat loss and energy dissipation. Hydraulic systems are also susceptible to leaks, contamination, and maintenance complexities, making them unsuitable for sustained unmanned operation in dusty, remote, or high-temperature environments common in rural energy applications. Furthermore, hydraulic hybrid designs are largely incompatible with solar energy integration because their operating principle relies on pressurized fluid rather than direct thermal or mechanical input.

[0007] Purely mechanical solar energy drives have been investigated as an alternative for directly integrating renewable energy into mechanical systems. These drives typically use thermal expansion materials, shape-memory alloys, or Stirling mechanisms to convert solar heat into mechanical motion. However, these systems have traditionally suffered from issues such as intermittent operation, limited torque capacity, and difficulty synchronizing with motor drive shafts. For example, traditional Stirling engines offer excellent heat-to-work conversion efficiency, but are mechanically complex and difficult to scale up to provide variable torque. Furthermore, their continuous operation requires precise thermal cycle control and pressure regulation, making them difficult to maintain in outdoor solar environments without an active control system. Similarly, shape-memory alloy actuators have low cyclic efficiency, rapid fatigue under repeated expansion-contraction cycles, and limited output power, making them unsuitable for heavy load transmission or distributed mechanical power supply.

[0008] Another type of solar-based system seeks to integrate solar power generation with a brushless DC motor drive, dynamically adjusting the energy input to the motor using a maximum power point tracking (MPPT) circuit. While these solutions offer some degree of automation and control, they rely on sophisticated electronic converters and real-time data acquisition systems. These devices increase the risk of system failure in harsh environmental conditions where temperature, dust, and humidity can degrade electronic components. Additionally, hybrid solar-motor systems require an energy storage element, typically a lithium-ion or lead-acid battery, to smooth out power fluctuations caused by fluctuating solar radiation. Battery-based systems incur additional costs, require regular maintenance, and have a finite lifespan, raising long-term operational costs and environmental waste disposal concerns.

[0009] The problem of torque imbalance in distributed mechanical systems presents additional technical challenges. Many multi-axis systems, such as those used in manufacturing lines, irrigation systems, and agricultural processing units, experience dynamic mechanical load fluctuations between different branches. Traditional designs use electronic torque sensors and motor control techniques to detect and correct load imbalances. These electronic feedback systems have inherently slow mechanical response, are susceptible to signal delays, and rely on a continuous power supply and sensor accuracy. They often fail to maintain synchronized rotation among multiple axes when sudden load changes occur, resulting in vibration, uneven wear, and mechanical inefficiencies. While mechanical differential solutions have met with limited success, they are typically configured for static torque distribution in automotive applications and are not optimized for continuous industrial load balancing, where input torque and output resistance vary independently.

[0010] Existing vibration isolation and torque stabilization systems also have significant limitations. Traditional torque dampers use rubber or viscoelastic materials to absorb torque spikes, but their damping capacity degrades rapidly with increasing temperature and continuous, cyclic stress. Metal-spring couplings offer improved durability but tend to amplify resonant frequencies, especially in systems with multiple dynamic inputs. This resonance can lead to long-term fatigue damage, shaft misalignment, and bearing failure. Furthermore, many of these isolators are designed for single-source drive systems. In hybrid configurations with combined solar and motor torque inputs, traditional isolators cannot dynamically absorb the constantly changing torque ratios between the input sources, resulting in mechanical instability and loss of synchronization.

[0011] The remaining technical challenge is a unified, self-regulating mechanical system that can integrate torque from the solar cell and motor, compensate for dynamic load imbalances, and maintain continuous operation without electronics or an external cooling system. Such a system must achieve this through inherent mechanical coordination utilizing a planetary gear configuration, differential torque distribution, and passive thermal management to achieve a durable, autonomous, and sustainable hybrid drive solution. This lack of a fully integrated solar-assisted mechanical transmission highlights the need for this invention. This invention directly addresses these shortcomings by introducing a solar-assisted motor drive system with real-time mechanical load balancing and structural thermal self-regulation. Summary of the Invention [Problem to be solved by the invention]

[0012] This invention provides a solar-assisted motor drive system that includes a solar-powered mechanical input unit, a crankshaft coupling assembly, a torque-combining planetary gear train, a differential torque balance assembly, and a torsional vibration isolator, all housed within a structural load-transfer enclosure with integrated cooling and lubrication circuits. Solar energy is mechanically harnessed through a thermally responsive actuator. In this actuator, a working medium (e.g., a phase-change fluid or thermally expansive gas) undergoes volumetric expansion when exposed to concentrated solar radiation. This expansion generates reciprocating motion, which is converted into rotational torque through a crankshaft linkage. The generated rotational torque is combined through a planetary gear train that mechanically mixes the solar energy and the torque of the motor drive shaft in a proportional manner, without the need for an electronic power management interface. The combined torque is transferred to a dual-spider differential gear assembly through a torsional vibration isolator, which automatically redistributes the torque according to the resistance of each load shaft, ensuring real-time mechanical load balancing. The entire structure is enclosed within a thermally regulated housing, with finned surfaces for heat dissipation and an integrated impeller pump for lubrication. This ensures sustained mechanical balance and a long service life. The entire structure is housed within a thermally regulated housing, with finned surfaces for heat dissipation and an integrated impeller pump for lubricating oil circulation, ensuring sustained mechanical balance and long-term operational stability.

[0013] The primary objective of this invention is to provide a solar-assisted electric motor drive system that achieves continuous and efficient mechanical power transmission by integrating solar thermal energy and electric motor torque within a unified mechanical framework. This invention overcomes the limitations of conventional hybrid systems by directly coupling solar-generated mechanical motion with electric motor drive torque through a purely mechanical transmission mechanism, eliminating the need for electrical synchronization and complex electronic control units. By employing a thermally responsive actuator, this invention converts solar heat into reciprocating motion, which can be continuously coupled and balanced with motor output through an integrated gear train and differential system. This approach ensures uninterrupted operation even under fluctuating solar radiation and provides consistent, self-regulating mechanical output, suitable for distributed applications such as agricultural systems, small-scale industries, and sustainable mechanical power networks.

[0014] A further object of the present invention is to achieve real-time torque compounding and load sharing using mechanical planetary and differential gear assemblies that can dynamically distribute power among multiple output shafts in response to instantaneous load conditions. Unlike traditional systems that rely on electronic feedback loops or motor speed controllers, the present invention enables automatic torque redistribution through the inherent mechanical behavior of the gear assemblies. This ensures stable angular velocities among multiple distributed loads, reduces mechanical stresses during transient load changes, and prevents uneven torque distribution that can lead to premature component wear and operational instability.

[0015] Another object of the present invention is to provide a means of suppressing torsional vibrations and mechanical resonances within the drive system through a dedicated torsional vibration isolator incorporated between the torque complex and the differential. The isolator is designed to absorb and damp transient torque fluctuations resulting from variable load conditions and asynchronous input torque. By allowing controlled angular displacement and elastic recovery, the isolator ensures smooth torque transmission, improved rotational stability, and extended life of the connected shaft and bearings. This allows the system to achieve a high level of mechanical smoothness and stability without the need for external damping devices or active feedback systems.

[0016] A further objective of the present invention is to maintain thermal balance and mechanical durability during extended operation by incorporating a structurally integrated load-transfer enclosure. This enclosure is designed not only as a protective housing but also as a thermal management component, with a finned exterior surface for natural convection cooling and internal lubrication circulation channels to dissipate heat from friction and solar heating. The structural enclosure also functions as a load-bearing framework that maintains precise shaft alignment and gear mesh integrity, even under thermal expansion and fluctuating torque. By ensuring self-contained thermal regulation and structural rigidity, the present invention minimizes maintenance demands and improves mechanical durability in harsh operating environments.

[0017] Another important objective of the present invention is to provide a distributed power transmission system that can accommodate asynchronous mechanical loads without requiring external power electronics. The system's built-in differential torque balancing mechanism allows multiple load shafts to operate in parallel, with each shaft receiving torque proportional to its instantaneous resistance. This characteristic is particularly advantageous in distributed machine networks with dynamically changing load conditions, such as multiple pumps, mills, and conveyor units operating simultaneously under variable resistance. The system autonomously reallocates torque among these loads, ensuring optimal utilization of available mechanical energy and preventing overloads and stalls in individual branches.

[0018] A further objective of this invention is to provide mechanical and thermal stability through adaptive design of the transmission components and support structure. The shaft and coupling are designed to accommodate thermal expansion without inducing stress or misalignment, and lubrication circulation paths promote uniform temperature distribution throughout the system. The entire configuration is optimized to reduce energy losses due to friction and vibration, thereby achieving superior mechanical efficiency compared to conventional systems employing electric hybrids or hydraulic couplings. [Means for solving the problem]

[0019] To achieve the above object, the present invention provides a solar-assisted motor drive system for distributed mechanical power supply, comprising: a solar-powered mechanical input unit including a thermally responsive actuator configured to generate reciprocating motion through solar-induced expansion of a working medium enclosed within a sealed actuator chamber; a crankshaft coupling assembly operatively connected to the thermally responsive actuator for converting the reciprocating motion into rotational torque; a torque compound transmission mechanism comprising a multi-stage planetary gear train, the gear train having a first input shaft connected to the crankshaft coupling assembly and a second input shaft connected to an electric motor drive shaft, the gear train configured to combine torque from both sources and transmit it through a common output carrier shaft; and a differential torque balance assembly connected to the output carrier shaft, the assembly being configured to distribute the torque between the two sources. a dual spider bevel gear set configured to redistribute combined torque in response to instantaneous mechanical resistance between a plurality of load shafts connected to the solar-powered mechanical input unit; a torsional vibration isolator interposed between the torque composite transmission mechanism and the differential torque balance assembly, the torsional vibration isolator including a spring-damper coupling configured to absorb periodic torque fluctuations and maintain mechanical stability across the load shafts; and a structural load transfer enclosure, housing the torque composite transmission mechanism, the differential torque balance assembly, and the torsional vibration isolator, the enclosure having integral fins and internal lubrication circulation channels to maintain mechanical thermal equilibrium during continuous operation, wherein the thermally responsive actuator of the solar-powered mechanical input unit includes opposed expansion pistons symmetrically arranged on either side of a solar heat absorption plate; The pistons are connected by a common connecting yoke, and thermal expansion of the working medium in each chamber generates balanced reciprocating forces, minimizing lateral vibration and transmitting uniform torque to the crankshaft linkage assembly; and the crankshaft linkage assembly includes a connecting rod connected to the primary crankpin and a flywheel coaxially mounted on the crankshaft, the flywheel sized to store angular momentum during each reciprocating cycle of the actuator. [Effects of the Invention]

[0020] In the solar-assisted motor-drive system for distributed mechanical power supply according to the present invention, solar thermal energy is directly converted into reciprocating motion within the actuator, which is then converted into continuous rotational motion via the crankshaft and flywheel. Rotational torque generated from solar input is combined with torque from the electric motor drive shaft via a planetary gear train to form a unified mechanical output that dynamically adjusts according to the instantaneous torque contribution of each input source. Torsional vibration isolators located between the transmission and differential mitigate cyclic torque fluctuations, and the differential mechanism automatically redistributes torque based on the real-time resistance of the load shaft. The structural enclosure is equipped with integral fins for convection cooling and internal lubrication circulation channels to maintain thermal balance and mechanical durability. [Brief explanation of the drawings]

[0021] These and other features, aspects, and advantages of the present disclosure will be better understood from the following detailed description when read in conjunction with the accompanying drawings, in which like reference symbols represent like parts throughout.

[0022] Figure 1 shows the block diagram of a solar auxiliary motor drive system with real-time load sharing for sustainable distributed power networks. FIG. 2 is a schematic diagram showing a perspective view of a solar auxiliary motor drive system with real-time load sharing for a sustainable distributed power network. Figure 3 is a schematic diagram showing a front view of a solar auxiliary motor drive system with real-time load balancing for a sustainable distributed power network.

[0023] Additionally, those skilled in the art will appreciate that elements in the figures are illustrated for simplicity and may not necessarily be drawn to scale. For example, a flowchart illustrates a method in terms of the most prominent steps involved to help improve understanding of aspects of the present disclosure. Furthermore, with respect to device structure, one or more components of the device may be represented in the drawings by conventional symbols, and the drawings may show only certain details relevant to understanding embodiments of the present disclosure, so as not to obscure the drawings with details that will be readily apparent to one skilled in the art having the benefit of the description herein. DETAILED DESCRIPTION OF THE INVENTION

[0024] For the purposes of promoting an understanding of the principles of the invention, reference will be made to the embodiments illustrated in the drawings and specific language will be used in describing the same, but no limitation on the scope of the invention is intended, it being understood that changes and further modifications in the illustrated systems, and further applications of the principles of the invention shown therein, are within the ordinary skill of one skilled in the art.

[0025] Those skilled in the art will understand that the foregoing general description and the following detailed description are exemplary and explanatory of the invention, but are not intended to be limiting. The use of "in one embodiment," "in another embodiment," or similar phrases throughout this specification means that a particular feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment," "in another embodiment," and similar phrases throughout this specification do not necessarily refer to the same embodiment, although they may.

[0026] The use of "comprises," "comprises," or other similar expressions is intended to be non-exclusive; a process or method containing a list of steps does not include only those steps, but may include other steps not expressly listed or inherent in the process or method. Similarly, the use of "comprises" preceding one or more devices, subsystems, elements, structures, or components does not, unless further constrained, exclude the presence of other devices, subsystems, elements, structures, or components, or additional devices, subsystems, elements, structures, or components.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. The systems, methods, and examples described herein are illustrative only and not intended to be limiting.

[0028] The embodiments herein are described in detail below with reference to the accompanying drawings, in which: As shown in Figure 1, a block diagram of a solar-assisted motor drive system with real-time load balancing for a sustainable distributed power network is shown.

[0029] The system 100 includes: a solar-powered mechanical input unit (102) including a thermally responsive actuator (102a) configured to generate reciprocating motion through solar-induced expansion of a working medium enclosed within a sealed actuator chamber; a crankshaft linkage assembly (104) operatively connected to the actuator and converting the reciprocating motion into rotational torque; a torque-combining mechanism (106) consisting of a multi-stage planetary gear train having a first input shaft connected to the crankshaft linkage assembly and a second input shaft connected to a motor drive main shaft, configured to couple and transmit torque from both power sources via a common output carrier shaft; and a differential torque balance assembly (108) connected to the output carrier shaft. The assembly includes a dual spider bevel gear set configured to redistribute the combined torque in response to instantaneous mechanical resistance between the distributed load shafts (108a); a torsional vibration isolator (110) interposed between the torque composite transmission mechanism and the differential torque balance assembly, the isolator including a spring-damper coupling configured to absorb cyclic torque fluctuations and maintain mechanical stability across the load shafts; a structural load transfer enclosure (112) housing the torque composite transmission mechanism, the differential torque balance assembly, and the torsional vibration isolator, the enclosure having integral fins and internal lubrication circulation channels to maintain mechanical and thermal balance during continuous operation.

[0030] Figure 2 is a schematic diagram showing a perspective view of a solar-assisted motor drive system (shown in Figure 1) with real-time load balancing for a sustainable distributed power network.

[0031] Figure 3 is a schematic diagram showing a front view of a solar-assisted motor drive system (shown in Figure 1) with real-time load balancing for a sustainable distributed power network.

[0032] In one embodiment, the thermally responsive actuator (102a) of the solar-powered mechanical input unit includes opposing expansion pistons symmetrically positioned on either side of a solar heat absorber plate, connected by a common connecting yoke, such that thermal expansion of the working medium in each chamber generates balanced reciprocating forces that transmit uniform torque to the crankshaft linkage with minimal lateral vibration.

[0033] In one embodiment, the crankshaft coupling assembly (104) includes a connecting rod connected to the primary crankpin and a flywheel coaxially mounted on the crankshaft, the flywheel being sized to store angular momentum during each reciprocating cycle of the actuator, thereby converting intermittent solar-driven impulses into continuous rotational motion for supplying to the torque compounding transmission mechanism.

[0034] In one embodiment, the torque compounding mechanism (106) includes a sun gear attached to the sun input shaft, a ring gear driven by the motor drive shaft, and a carrier gear connected to the output carrier shaft, such that the rotational inputs from the sun actuator and the motor are mechanically compounded in a planetary gear set in a continuously variable ratio governed solely by the relative torque contributions of each input source.

[0035] In one embodiment, the differential torque balancer (108) comprises a pair of opposing bevel gears mounted on a cross shaft supported within the spider casing, each bevel gear connected to a corresponding distributed load shaft through a coupling joint. The system operates to automatically redistribute torque in proportion to load changes, minimizing rotational speed differences between the load shafts under asynchronous loading conditions.

[0036] In one embodiment, the torsional vibration isolator (110) includes an inner hub rigidly coupled to an output carrier shaft and an outer housing attached to a differential torque balancer, with an annular elastic element compressed between the hub and housing to allow angular displacement under transient torque pulses and elastic recovery to restore rotational balance once the load change has stabilized.

[0037] In one embodiment, the structural load transfer enclosure (112) is formed as a monoblock housing with spiral surface fins for natural convection cooling and an internal oil gallery connecting the gear train chamber to the differential chamber. A shaft-driven impeller located within the lubrication channel circulates oil through both sections, thereby providing continuous thermal balancing and friction damping.

[0038] In one embodiment, the torque composite transmission mechanism (106) and differential torque balance assembly are supported on self-aligning roller bearings mounted within a structural load transfer enclosure, which maintains the mechanical alignment of the coaxial shafts under differential expansion and fluctuating torque loads, ensuring uniform transmission efficiency and improved mechanical durability.

[0039] In one embodiment, the distributed load shaft (108a) is connected to the differential torque balancer via an expandable shaft coupling with a splined inner sleeve that accommodates axial expansion under thermal variations while eliminating lateral stresses in the torque transmission path. In one embodiment, the structural load transfer enclosure (112) further includes an integral mechanical flywheel directly coupled to the output carrier shaft that acts as a passive kinetic energy storage device to stabilize angular velocity fluctuations resulting from intermittent solar input power.

[0040] This detailed description of the present invention comprehensively describes the functional architecture, component interconnections, and operating mechanism of a solar-assisted motor-drive system with real-time load balancing capabilities for sustainable distributed power networks. The system is designed to operate through the principles of purely mechanical energy conversion and dynamic torque management, combining solar-derived mechanical motion with conventional motor-drive input to generate a stable, continuous, and balanced power output. The invention employs an intelligent yet fully mechanical coordination method similar to that implemented through mechanical interactions, where the coordinated actions of actuators, planetary gear systems, torsional isolators, and differentials harmonize torque, motion, and energy flow over multiple stages.

[0041] The system features a thermally responsive actuator that serves as the primary interface between the solar energy and mechanical subsystems. The actuator consists of two sealed expansion chambers symmetrically surrounding a solar heat absorber plate. Each chamber contains a working medium, such as metal vapor, a thermally expansive gas, or a phase-change fluid. When the absorber plate is exposed to sunlight, the medium undergoes volumetric expansion, resulting in equal and opposite piston displacement. This symmetric actuation is functionally equivalent to balanced actuation, where a linear force on one side of the actuator is mechanically counterbalanced by an equal force on the other side, eliminating lateral vibration and maintaining structural equilibrium. The pistons are connected via a connecting yoke, transmitting net reciprocating power to a crankshaft, where the reciprocating motion is converted to rotary motion by a crank-rod conversion mechanism.

[0042] The crankshaft assembly provides a mechanical implementation of time-averaging technology. The angular momentum of a flywheel attached to the crankshaft stores kinetic energy with each reciprocating cycle and releases it during low-impulse intervals, effectively smoothing out torque fluctuations. This operation is similar to digital signal filtering technology, where transient peaks and valleys in torque are mechanically integrated to produce a continuous rotational output. The inertia of the flywheel thus acts as a mechanical low-pass filter, maintaining rotational stability and ensuring a continuous energy supply from an inherently intermittent solar source.

[0043] Rotational motion from the crankshaft is transferred to a multi-stage planetary gear train, which functions as a torque compounding mechanism. In this assembly, the sun gear is connected to the sun-driven crankshaft, and the ring gear is driven by the electric motor shaft. The planetary gears located between the two perform the equivalent of a mechanical adaptive blending technique. The relative torque contributions from the sun and motor inputs are dynamically compounded in real time based on the instantaneous mechanical conditions. When the sun torque is high, the planet carrier makes proportional adjustments to increase the energy transfer from the sun gear. When the sun torque is low, the motor-driven ring gear compensates by providing a higher torque share. This proportional adjustment is driven purely by mechanical feedback between the meshed gears, without electronic control, and is continuous and autonomous. The compound torque output from the planetary gear system is transmitted through a torsional vibration isolator before distribution to the load shaft. This isolator incorporates an inner hub attached to the carrier shaft and an outer casing connected to the differential, with an elastic annular element positioned between them. The isolator's operation mimics feedback damping techniques for controlling mechanical vibrations. When the system experiences a transient torque surge or sudden load change, the elastic elements absorb excess energy through controlled angular displacement. Once the imbalance subsides, the stored elastic energy is gradually released, restoring rotational equilibrium. This cyclical absorption-release process mimics proportional-integral feedback control techniques, whereby a mechanical system continuously monitors its energy state and adjusts its rotational stiffness to maintain dynamic stability.

[0044] After torque stabilization, the energy is transferred to a dual-spider bevel gear differential, which distributes the load in real time among multiple distributed load shafts. The differential operates through a set of opposing bevel gears connected to the output shaft, each driven through a coupling joint capable of angular and axial displacement. The differential's technical function can be described as a self-balancing distribution process that automatically distributes torque based on the instantaneous mechanical resistance of the output shaft. As resistance increases on a load shaft, the bevel gears fine-tune within the spider casing, redistributing proportionally higher torque to that shaft while reducing torque on the shaft with lower resistance. This self-adjusting redistribution is continuous and instantaneous, ensuring synchronous speed control and preventing mechanical lag and overload. The entire operation is driven by internal kinematic balance and does not require sensors or control circuits. This is essentially the mechanical analog of real-time adaptive resource allocation techniques that achieve load balancing through continuous dynamic feedback within the gear network.

[0045] Distributed torque transmission is further enhanced by the use of an expandable shaft coupling with a splined inner sleeve to accommodate axial expansion under thermal fluctuations. This construction ensures no lateral stress or misalignment occurs, even during long-term operation or temperature fluctuations. The shaft is supported on a self-aligning roller bearing installed within the housing, providing precise coaxial alignment and reducing friction losses. These mechanical improvements collectively contribute to a comprehensive technology that is self-maintaining and structurally self-aligning, ensuring long-term operational stability without the need for external calibration or adjustment.

[0046] The entire assembly is housed within a one-piece load-transfer enclosure that serves dual mechanical and thermal regulation functions. The enclosure's exterior features spiral fins to maximize heat dissipation through natural convection, while its interior contains lubrication passages that interconnect the planetary and differential gear chambers. Shaft-driven impellers located within these passages circulate the lubricant across the interior surfaces. This circulation process follows a closed-loop thermodynamic feedback pattern: as temperature increases, oil viscosity decreases, increasing flow through the passages and improving heat dissipation efficiency. This self-compensating mechanism acts as a passive fluid dynamic thermal control technique, maintaining optimal lubrication and temperature balance even during long periods of continuous operation. It also prevents misalignment and lubricant degradation due to thermal expansion.

[0047] The integrated operation of the actuator, transmission, isolator, and differential assemblies creates a multi-stage mechanical technology for energy conversion, torque synthesis, and load balancing. Each subsystem performs a specific functional step corresponding to a technological process. The actuator performs the conversion of solar energy to mechanical energy through thermal expansion and compression cycles, while the crankshaft and flywheel perform transient energy integration to smooth torque delivery. The planetary gear system provides adaptive torque synthesis based on dynamic input balancing, the vibration isolator provides damping and balance restoration through elastic feedback, and the differential achieves real-time load balancing through proportional torque redistribution. Together, these subsystems form a continuous, closed-loop mechanical computational cycle that senses, processes, and responds to dynamic energy and load variations solely through physical interaction, not electronic or computational control.

[0048] During steady-state operation, the system maintains mechanical equilibrium, dynamically balancing torque from both the solar and motor inputs. Each distributed load shaft receives torque proportional to its real-time resistance. As solar intensity increases, the actuator torque output increases, and the planetary gear train readjusts the torque distribution ratio, automatically reducing the motor input share. Conversely, when solar irradiance decreases, the planetary gear train maintains output continuity by increasing the torque ratio from the motor-driven ring gear. This self-adjusting mechanical behavior effectively runs adaptive optimization routines without the need for any program logic or sensors.

[0049] The present invention provides a purely mechanical implementation of energy optimization and distribution technology that is entirely driven by interdependent mechanical responses rather than electronic controls. Dynamic torque blending, vibration suppression, load synchronization, and thermal stabilization are achieved within a unified structural framework. The result is a self-balancing, energy-efficient, minimal-maintenance hybrid drive system capable of delivering continuous power under a wide variety of environmental and operating conditions.

[0050] The solar-powered mechanical input unit includes a thermally responsive actuator with two opposing expansion pistons symmetrically positioned on either side of a solar heat absorber. The actuator chamber is sealed and filled with a thermally expansive working medium. When exposed to concentrated solar heat, the medium's volumetric expansion displaces the pistons in equal and opposite directions. The pistons are connected via a common yoke, converting the bidirectional displacement into linear reciprocating motion. This balanced arrangement minimizes lateral vibration and ensures symmetric load distribution to the connecting crankshaft. The reciprocating motion generated by the actuator is transmitted to a crankshaft linkage. A connecting rod is attached to the primary crankpin, which is coupled to a flywheel coaxially positioned on the crankshaft. The flywheel accumulates angular momentum with each reciprocating cycle, effectively converting intermittent solar impulses into continuous rotational motion. This smoothed rotational torque is supplied to a torque-combining transmission mechanism.

[0051] The torque compound transmission mechanism consists of a multi-stage planetary gear train with a sun gear connected to the input sun shaft, a ring gear driven by the electric motor drive shaft, and a carrier gear connected to a common output carrier shaft. The planetary arrangement allows for continuous mechanical torque mixing proportional to the instantaneous torque contributions of the sun input and the electric motor input. The mechanism operates purely based on differential torque balance without any clutches or electronic controls. The planetary gear train is enclosed in an oil-lubricated chamber for smooth operation and minimal wear. The output carrier shaft from the planetary gear train is connected to a dual spider bevel gear differential. The differential consists of a pair of opposing bevel gears mounted on a cross shaft within the spider casing. Each bevel gear is connected to a corresponding distributed load shaft through a coupling joint. If the load resistance varies between the output shafts, the bevel gear set automatically redistributes torque and mechanically compensates for the speed difference. This ensures synchronous rotation and stable torque transmission even under asynchronous loads.

[0052] A torsional vibration isolator is interposed between the torque compound mechanism and the differential. It includes an inner hub rigidly connected to the carrier shaft and an outer housing attached to the differential casing. An annular, resilient elastomeric element, acting as a spring damper, is positioned between the hub and housing. This element allows limited angular displacement under transient torque fluctuations, absorbing shock and restoring equilibrium as the torque stabilizes. This improves the isolator's mechanical durability and reduces resonance fatigue. The system components are mounted within a one-piece cast housing that serves as a structural load-transfer enclosure. The enclosure features spiral surface fins to enhance natural convection cooling and incorporates internal lubrication channels connecting the gear train and differential sections. A shaft-mounted impeller circulates oil through these channels, providing both lubrication and heat equalization. The enclosure also features an inspection port and an oil reservoir, ensuring easy maintenance and sustained cooling of the mechanical assembly during continuous operation. To accommodate axial expansion due to temperature changes, the distributed load shaft utilizes an expansion coupling with a splined sleeve. The main rotating components within the enclosure are supported on self-aligning roller bearings to ensure alignment of the coaxial shafts under varying torque loads. Additionally, an integral flywheel mounted directly on the output carrier shaft acts as a passive kinetic energy storage device, smoothing out angular velocity fluctuations caused by intermittent solar input.

[0053] The described solar-assisted motor drive system is particularly suited for applications requiring continuous mechanical power output with minimal electrical power dependency. Such applications include agricultural irrigation drives, decentralized milling and processing units, rural power transmission systems, and hybrid mechanical microgrids. The system's ability to mechanically couple solar and electric torques and redistribute loads without the need for electronic controllers significantly increases durability, operational autonomy, and sustainability.

[0054] The drawings and the foregoing description illustrate exemplary embodiments. Those skilled in the art will understand that one or more of the described elements may be combined into a single functional element. Alternatively, certain elements may be divided into multiple functional elements. Elements of one embodiment may be added to another embodiment. For example, the order of processes described herein may be changed and is not limited to the methods described herein. Furthermore, the operations in the flow diagrams need not necessarily be implemented in the order shown, and not all operations need necessarily be performed. Furthermore, operations that are independent of other operations may be performed in parallel with other operations. The scope of the embodiments is in no way limited by these specific examples. Numerous variations are possible, including differences in structure, dimensions, use of materials, and the like, whether or not explicitly described in the specification. The scope of the embodiments is at least as broad as that given by the following claims.

[0055] Although advantages, other benefits, and solutions to problems have been described above with respect to particular embodiments, these advantages, benefits, solutions to problems, and elements that may provide or facilitate any advantage, benefit, or solution should not be construed as required, necessary, or essential features or elements of any claim or all claims.

Claims

1. 1. A solar-assisted motor drive system for distributed mechanical power supply, comprising: a solar-powered mechanical input unit including a thermally responsive actuator configured to generate reciprocating motion through solar-heated expansion of a working medium enclosed within a sealed actuator chamber; a crankshaft coupling assembly operatively connected to said thermally responsive actuator for converting reciprocating motion into rotational torque; a compound torque transmission mechanism comprising a multi-stage planetary gear train having a first input shaft connected to said crankshaft coupling assembly and a second input shaft connected to an electric motor drive shaft, said gear train configured to combine and transmit torque from both sources through a common output carrier shaft; a differential torque balance assembly connected to the output carrier shaft, said assembly including a dual spider bevel gear set configured to redistribute combined torque in response to instantaneous mechanical resistance between the distributed load shafts; a torsional vibration isolator interposed between the torque composite transmission mechanism and the differential torque balance assembly, the torsional vibration isolator including a spring-damper coupling configured to absorb cyclic torque fluctuations and maintain mechanical stability across the load shaft; and a structural load transfer enclosure, housing said torque composite transfer mechanism, said differential torque balance assembly, and said torsional vibration isolator, the enclosure being provided with integral fins and internal lubrication circulation channels to maintain mechanical and thermal equilibrium during continuous operation; wherein the thermal responsive actuator of the solar-powered mechanical input unit includes opposing expansion pistons symmetrically arranged on both sides of a solar heat absorption plate, the pistons are connected by a common connecting yoke, and the thermal expansion of the working medium in each chamber generates a balanced reciprocating force, minimizes lateral vibration, and transmits a uniform torque to the crankshaft connecting device; The crankshaft linkage assembly also includes a connecting rod connected to the primary crankpin and a flywheel coaxially mounted on the crankshaft, the flywheel being sized to store angular momentum during each reciprocating cycle of the actuator.

2. 2. The solar-assisted motor drive system of claim 1, the torque compounding transmission mechanism includes a sun gear mounted on a solar input shaft, a ring gear driven by a motor-driven primary shaft, and a carrier gear connected to an output carrier shaft, configured such that rotational inputs from the solar actuator and the motor are mechanically compounded within a planetary gear set in a continuously variable ratio governed solely by the relative torque contributions of each input source; Here, the differential torque balance assembly includes a pair of opposing bevel gears mounted on a cross shaft supported within a spider casing, each bevel gear connected to a respective distributed load shaft via a coupling joint, the assembly operating to automatically redistribute torque in proportion to load changes and minimize rotational speed differences between the load shafts under asynchronous load conditions.

3. 2. The solar-assisted motor drive system of claim 1, The torsional vibration isolator includes an inner hub rigidly coupled to an output carrier shaft and an outer housing attached to a differential torque balancer, with an annular elastic element compressed between the inner hub and housing to allow angular displacement under transient torque pulses and restore rotational balance through elastic recovery once the load fluctuations have stabilized.

Images