DESC:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patent Rules, 2003
COMPLETE SPECIFICATION
(See sections 10 & rule 13)
1. TITLE OF THE INVENTION
A TEST RIG FOR POWER TAKE OFF (PTO) PERFORMANCE AND ENDURANCE LOAD TEST USING HYDRAULIC LOADING
2. APPLICANT (S)
NAME NATIONALITY ADDRESS
BEML LIMITED IN BEML Soudha, No 23/1, 4th Main S.R. Nagar, Bengaluru- 560027, Karnataka, India.
3. PREAMBLE TO THE DESCRIPTION
COMPLETE SPECIFICATION

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

FIELD OF INVENTION:
[001] The present invention relates to the field of test device for gear box. The present invention in particular relates to a test rig for power take off (PTO) performance and endurance load test using hydraulic loading.
DESCRIPTION OF THE RELATED ART:
[002] The PTO Type B (power take off) unit is fitted on the Main Gear Box (MGB) of Tatra vehicles as an optional attachment as required. The input to PTO Type B is taken from MGB and this unit has two outputs. One output is connected to Hydraulic Pump and other output shaft is used for driving the devices on superstructure like alternator, hydraulic pump etc.
[003] The PTO Type B assembly is mounted on to the test rig using the Fixture and driven by an Electric Motor having adequate capacity for the Torque & Speed requirement. For performance and endurance load testing either by electrical dynamometer or water brake dynamometer separate devices for controlling and indicating is required. However, in this invention Hydraulic loading utilized for loading of device to evaluate the power of the unit developed.
[004] The main advantage of this invention is precise control of load using the loading device with throttle controllers for varying oil pressure and oil flow. The resulted power is calculated using flow meter and pressure gauges.
[005] As per the design of the unit, the test arrangement was designed and arranged to satisfy the conditions of performance testing and load testing on PTO. For testing of the both conditions of the above require to use electrical prime mover with variable frequency drive.
[006] Reference may be made to the following:
[007] Publication No. US6820472 relates to a test rig for testing a power transmission device, having an input shaft, an output shaft and a casing, may include a first assembly having a coupling shaft that is connected by a rigid and coaxial coupler to the output shaft of the power transmission device. A second assembly of the test rig is connected to the input shaft. The casing is mounted on a position-adjustable support, and a controllable adjusting device adjusts the position of the support. The adjusting device adjusts the position of the support so as to apply forces and moments acting along six degrees of freedom of the casing to the casing, and the support and the adjusting device bring the casing into a spatial position such that all the forces and moments likely to be generated on the output shaft are applied to the casing.
[008] The above publication relevant to power transmission device having six degrees of freedom, however present invention PTO is fixed in one position and it is fixed to main gear box of the vehicle having one input and two out puts. one output and input will be in same side, and other output will be opposite to the input.
[009] Publication No. CN207379720 relates to a tractor power take off test detection device, it is including setting up the trench on foundation ground, both ends are equipped with right roller group and left rollers set respectively about the trench, and one is set up respectively by the walking wheel of the front axle of survey tractor and rear axle on right roller group and the left rollers set, be equipped with gear box casing and cluster engine on the domain of tractor, the rear portion of tractor is equipped with the output shaft, the output shaft is in with the setting the first shaft coupling swing joint of the last measuring box of foundation ground, internal five gas tails assay appearance and the moment of torsion detector of being equipped with of detection case, adopting above -mentioned structure, having realized that installation and debugging are simple and convenient, the operation is reliable, effect that can the various indexes of short -term test tractor power take off.
[010] The above invention applicable to ground application and present invention PTO is applicable to vehicle fitment unit using as auxiliary power unit device.
[011] Publication No. CN107884180 relates to a gear box moment test rig comprises a driving device, a to-be-tested device, a monitoring device and a brake device, and is characterized in that the driving device comprises a support; a driving motor is arranged on the support; the driving motor is connected with a primary decelerator; the primary decelerator is connected with the tested device through a transmission shaft; the to-be-tested device comprises a secondary decelerator with the consistent concentricity with the transmission shaft; the monitoring device comprises a torque data acquisition device fixedly mounted with the secondary decelerator; the torque data acquisition device is in same axis connection with the secondary decelerator and a torsion bar; the torque data acquisition device is provided with a sensor; the monitoring device comprises an operation table; the brake device comprises an accelerator; the accelerator comprises an output shaft; and the output shaft is in same axis connection with the brake. The service life of a to-be-tested decelerator under the output torque with a fixed value can be measured, and a torque value which enables the service life of the tested decelerator to be the longest can be obtained accurately.
[012] The above invention applicable to Brake mechanism and present invention is applicable to vehicle fitment unit using as auxiliary power unit device. The power of the unit can be measuring by hydraulic loading by varying oil pressure & oil flow with precision throttle controllers instead of Electrical or Mechanical dynamometer loading.
[013] Publication No. CN103245506 relates to an endurance test device of a hydraulic release bearing, which comprises a rack table, a bedplate, a clutch master cylinder and an air cylinder, wherein the bedplate is arranged at the upper end of the rack table; two chutes are formed in parallel in the bedplate; the clutch master cylinder and the air cylinder are arranged on the back chute side by side; a push rod of the air cylinder is connected with the clutch master cylinder; an L-shaped bracket and a mounting fixture are arranged correspondingly on the other chute; a pressure sensor and a spring fixing seat are mounted on the L-shaped bracket; the hydraulic release bearing to be tested is mounted between one end, equipped with a spring, of the spring fixing seat and the mounting fixture; and one end of the clutch master cylinder is connected an oil inlet of the hydraulic release bearing to be tested through a high-pressure oil pipe. The endurance test device is simple in structure, adopts automatic control, and can perform the endurance test on the hydraulic release bearing uninterruptedly for 24 hours, so that manual labor is reduced, and the detection efficiency is high.
[014] The above invention applicable to hydraulic release braking and present invention is applicable to vehicle fitment unit using as auxiliary power unit device. The power of the unit can be measuring by hydraulic loading by varying oil pressure &oil flow with precision throttle controllers instead of Electrical or Mechanical dynamometer loading.
[015] Publication No. US2013283899 relates to a gearbox test rig is provided for testing first and/or second gearboxes having power ratings of 1 MW or more. The gearbox test rig comprises a first coupler for coupling a low-speed shaft of a first gearbox to a low-speed shaft of a second gearbox such that forces can be transmitted between the low-speed shafts of the first and second gearboxes. The gearbox test rig further comprises a second coupler for coupling a high-speed shaft of the first gearbox to a high-speed shaft of the second gearbox such that forces can be transmitted between the high-speed shafts of the first and second gearboxes, wherein the second coupler comprises a hydraulic rotary actuator for regulating a torque which is applied to the high-speed shafts of the first and second gearboxes. Such a gearbox test rig is particularly useful for testing heavy duty gearboxes, such as those used in wind turbines.
[016] The above invention applicable to wind tunnels and present invention is applicable to vehicle fitment unit using as auxiliary power unit device and it under dynamic load conditions. The power of the unit can be measuring by hydraulic oil pressure and oil flow with precision throttle controllers instead of Electrical or Mechanical dynamometer loading.
[017] Publication No. KR101553166 relates to an apparatus for testing a multi-axis gear box, which is characterized by comprising a test gear boxy having a first output shaft, a second output shaft, and a third output shaft; a dummy gear box including a first input shaft coupled with the first output shaft and forming a first shaft, a second input shaft coupled with the second output shaft and forming a second shaft , and a third input shaft coupled with the third output shaft and forming a third shaft ; a first coupling including a key-lock to form the first shaft; a second coupling including a power-lock to form the second shaft; and a third coupling including a power-lock to form the third shaft.
[018] The above publication relevant to gear box device having multi axes gear box however present invention PTO is fixed in one position to the main gear box having one input and two out puts. one output and input will be in same side, and other output will be opposite to the input.
[019] Publication No. CN105510030 relates to an engineering machinery gearbox inclining test system and a test method thereof. The system comprises a test table and a test unit installed on the board of the test table. The system further comprises a control unit, a test table supporting body and a test table inclination drive unit. The lower end of the test table is connected to the top end of the test table supporting body in a rotating mode. The test table inclination drive unit comprises one or more hydraulic drive mechanisms. The top ends of drive parts of the hydraulic drive mechanisms are connected with the test table. The control unit controls the hydraulic drive mechanisms to operate to drive the test table to rotate on the test table supporting body, and therefore the board of the test table is inclined. A conventional line-shaped test table is structurally improved, and the test table can incline according to needs in the gearbox testing process, so that actual working conditions such as climbing and side swaying are simulated, and multi-angle and multi-state inclination state performance tests of the gearbox and reliability rests under the inclination state are achieved.
[020] The above publication relevant to gear box device having inclination test bench system to the test table, however present invention is fixed in one position to the main gear box having one input and two out puts. one output and input will be in same side, and other output will be opposite to the input.
[021] Publication No. KR101255679 relates to a torque generating device and a torque control system controlling the same are provided to install a plurality of actuators in the torque generating device, thereby easily controlling the actuators at higher precision. A torque generating device comprises a gearbox, a jig, and a plurality of actuators. The gearbox includes one or more gears interlocked with a driving shaft connected to the torque generating device. The jig supports the gear box. One end and the other end of the actuator are respectively hinge-connected to the jig and the gearbox, thereby applying torque to the gearbox.
[022] Reference may be made to an article entitled “Design of a mechanical power circulation test rig for a wind turbine gearbox” by Geun-Ho Lee, Young-Jun Park, Ju-Seok Nam, Joo-Young Oh and Jeong-Gil Kim; Appl. Sci. 2020, 10(9), 3240; 25 March 2020 talks about the mechanical power circulation test rig for a wind turbine gearbox with a power rating of 5.8 MW or less. The test rig consists of an electric motor, two auxiliary gearboxes, a torque-applying device, lubrication systems, cooling systems, and control systems. The torque generating device consists of a planetary gearbox and a hydraulic control system and is used to apply the desired torque to the test gearbox. The hydraulic control system applies the torque on the ring gear of the planetary gearbox. The gears and bearings of the two auxiliary gearboxes and planetary gearboxes met the design criteria for a safety factor of over 1.2 and a bearing life of 30,000 h. In addition, the master and slave gearboxes were connected to the test rig to verify whether the torque-applying device had applied variable torque in real-time during the test. The device was only able to induce a variable torque of up to 45.2 kN-m due to the limitation of the rated torque of the master and slave gearboxes. The test rig can test not only efficiency, vibration, and noise but also durability and overloading.
[023] The above publication relevant to power transmission device having multi axes gear box however present invention is fixed in one position to the main gear box having one input and two out puts. one output and input will be in same side, and other output will be opposite to the input.
[024] In order to overcome above listed prior art, the present invention aims to provide a test rig for power take off (PTO) performance and endurance load test using hydraulic loading.
OBJECTS OF THE INVENTION:
[025] The principal object of the present invention is to provide a test rig for power take off (PTO) performance and endurance load test using hydraulic loading.
[026] Another object of the present invention is to provide a test rig for power take off (PTO) performance and endurance load test providing precise control of load using the loading device by hydraulically.
[027] Yet another object of the present invention is to provide a method of testing of PTO gear box can be used whose input and two output sides and one output are on the same side and the other output will be other side and it can be used for smaller range of products and power range limits.
SUMMARY:
[028] The present invention relates to the test rig for power take off (PTO) performance and endurance load test using hydraulic loading. Refer figure 1
1. The system comprises Input driving motor (2), motor driving speeds with adjustable variable frequency drive (1) for increasing and decreasing speeds, the motor has start, stop and with emergency stop provisions (3).
2. The Torque sensor (5) for measurement of Input torque and the speed connected in between the motor and other side to PTO (15) under testing.
3. From the motor, propeller shafts (4) connecting in between the motor to Torque sensor. The propeller shafts connecting in between the Torque sensor to PTO. With suitable adaption plates for matching to PTO and torque sensors and driving units (6) connecting from PTO output shaft to hydraulic pump (7) (for loading).
4. The hydraulic pump (7) for loading of output shaft, input torque (8) indicating instrument, Pressure and Flow indicator instrument (8) with pressure relief valves (9) (safety valves) in between the main pump and hydraulic reservoir and in between in built pump (in PTO) and Hydraulic reservoir (10).
5. The cables connecting between the torque sensor and digital indicator and Cables connecting between flow & pressure indicators through indicators for loading pump and for in-built pump (11).
6. Oil chiller unit (13) was provided for cooling the oil during continuous running of endurance load testing.
7. Air Compressor (12) was provided for continuous engagement of PTO gears to mating for required speed to rotation.
8. Throttle controllers (14) are provided for loading and for precise control of load on hydraulic pumps though which apply load on the output shaft of the PTO (15) and for PTO inbuilt pump (11) for conducting performance load and endurance load testing.
BREIF DESCRIPTION OF THE INVENTION
[029] It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments.
[030] The following figures shows the arrangement of testing for the invention in detail-
[031] Figure 1 shows line diagram of testing arrangement of PTO Type B unit for Performance load testing and endurance load testing product;
[032] Figure 2 shows flowchart for performance load testing and endurance load testing/ product according to the present invention;
[033] Figure 3 shows the pictorial image of the product PTO Type B taken for invention.
[034] Figure 4 show testing arrangement for the conducting load testing and endurance load testing for the invention.
DETAILED DESCRIPTION OF THE INVENTION:
[035] The present invention relates to the test rig for power take off (PTO) performance and endurance load test using hydraulic loading. Refer figure 1-
1. The system comprises Input driving motor (2), motor driving speeds with adjustable variable frequency drive (1) for increasing and decreasing speeds, the motor has start, stop and with emergency stop provisions (3).
2. The Torque sensor (5) for measurement of Input torque and the speed connected in between the motor and other side to PTO (15) under testing.
3. From the motor with propeller shafts (4) connecting in between the motor to Torque sensor. The propeller shafts connecting in between the Torque sensor to PTO. With suitable adaption plates for matching to PTO and torque sensors and driving units (6) connecting from PTO output shaft to hydraulic pump (7) (for loading).
4. The hydraulic pump (7) for loading of output shaft, input torque (8) indicating instrument, Pressure and Flow indicator instrument (8) with pressure relief valves (9) (safety valves) in between the main pump and hydraulic reservoir and in between in built pump (in PTO) and Hydraulic reservoir (10).
5. The cables connecting between the torque sensor and digital indicator and Cables connecting between flow & pressure indicators through indicators for loading pump and for in-built pump (11).
6. Oil chiller unit (13) was provided for cooling the oil during continuous running of endurance load testing.
7. Air Compressor (12) was provided for continuous engagement of PTO gears to mating for required speed to rotation.
8. Throttle controllers (14) are provided for loading of hydraulic pumps though which apply load on the output shaft of the PTO (15) and for PTO inbuilt pump (11) for conducting performance load and endurance load testing.
[036] Testing system includes the following:
[037] Refer figure 1-
1. Motor (2) and Motor driving device (Variable frequency device consisting of speed increasing and decreasing device, start and stop device, emergency device (1 &3)
2. Torque transducer (5) for measuring input torque and speed of PTO.
3. Driving device between motor and torque transducer, i.e., Propeller shaft (4)
4. Driving device between torque transducer and PTO, i.e., Propeller shaft (4)
5. Torque and speed digital indicator (for measuring torque and speed)
6. Cables for connecting between torque transducer and digital indicator
7. Driving device between PTO output shaft and load device, i.e., Propeller shaft (6).
8. Air compressor (12) connected to PTO for proper gear engagement
9. Oil chillier unit (13) for cooling of oil
10. Hydraulic reservoir or over head tank (10) for storing of oil (working fluid for load testing)
11. Throttle controllers (14) for precise control of load for hydraulic pump and for inbuilt pump to PTO
12. Pressure relief valves (9) for safe guard of test rig.
[038] The loading device consists of the following:
1. Pump mounted on bracket
2. Over head tank or hydraulic reservoir (height shall be 1 meter
above suction port)
3. Suction pipe between pump and overhead tank
4. Delivery pipe to overhead tank through flow meter having flow and pressure pickups, relief valve (a safety device) and loading valve (gate valve)
5. Flow and pressure digital indicator
6. Flow meter reads the flow rate and pressure transducer provides pressure through digital indicator.
[039] The formula for the calculation of output power =
(Flow X Pressure)/600 in kW
[040] Where Flow is in lpm; Pressure in bar
[041] The PTO Type B (power take off) unit is fitted on the Main Gear Box (MGB) of vehicles as an optional attachment as required. The input to PTO Type B is taken from MGB and this unit has two outputs. One output is connected to Hydraulic Pump and other output shaft is used for driving the devices on superstructure like alternator, hydraulic pump etc. The assembly is mounted on to the test rig using the fixture and driven by an electric motor having adequate capacity for the torque & speed requirement. For performance and endurance load testing either by electrical dynamometer or water brake dynamometer separate devices for controlling and indicating is required.
[042] The invention provides precise control of load using the loading device. The resulted power is calculated using flowmeter and pressure gauges. The invention provides testing of PTO (Power take off) used in vehicles as an auxiliary unit. The unit is having input and output shafts and it requires performance test evaluation and endurance load testing at rated load conditions.
[043] The Loading device consists of PTO output shaft loading Pump mounted on bracket, over head tank (height shall be 1 meter above suction), suction pipe between pump and overhead tank for both main pump and for in-built pump, delivery pipe to overhead tank through flow meter having flow and pressure pickups, relief valve (a safety device) and loading valve (gate valve), flow and pressure digital indicator and flowmeter reads the flow rate and pressure transducer provides pressure through digital indicator.
[044] Motor drives the PTO through propeller shaft and torque transducer. As input rotates, the output also rotates as it is a gear drive. As output shaft starts rotating, the pump also rotates and starts sucking the oil from overhead tank and delivers the oil to the overhead tank through flow meter, relief valve and loading valve. The flow and pressure digital indicator starts showing the flow and pressure in the delivery line.
[045] When loading valve is rotated in clock wise direction manually, it slowly obstructs the flow of oil coming from delivery pipe. This will create in increase in the pressure which in turn demands more driving torque of total test system. The motor will supply required power through PTO to the pump. Thus, the PTO is subjected to load and deliver the power from motor to pump. The loading valve is major playing role here. The flow and pressure values will be utilized for calculating power. The input power from motor to PTO is measured using digital indicator of torque transducer. In addition to that Input from the prime over also can be calculated from the input torque sensor.
[046] The actuation of output shaft of the PTO and in built pump will be engages along with input shaft with a aid of the external air supply through Air reservoir. At a time both can be engage and also individually also can be engaged with proper air ports by supplying air pressure at the rate of 8 kg/cm².
[047] The oil cooler connected the delivery side of the main pump and in built pump to the PTO & after cooling the oil will be sent back to the hydraulic reservoir. Since the pressure build up and flow variations will be caused with the viscosity index of the oil used in the system. To maintain the oil temperature to the required limits and proper results oil cooler provided in the circuit.
[048] The present inventions used for testing of power take off assembly (PTO) which was having input and output shafts at the same side and also in-built pump also. The present invention serves that the input will drive both the output shaft and in-built pump. The input and output are in same side however the loading doing by hydraulically using throttle controller by varying pressure and flow in a precise loading pattern.
[049] The test arrangement requires hydraulic fluid (oil as working medium) receives from the same hydraulic oil reservoir for the both the output shaft loading and also for in-built pump loading. At the same time both output drives can be loaded with required rated load conditions.
[050] The system involves for loading of any product either with dynamometer or electrically or mechanically possible. This is compact in design and useful for smaller products.
[051] The PTO gear box is an optional unit using in TATRA vehicles having one input and two outputs. The input will be connected to the Main Gear box unit (MGB) in the vehicle. The input and one output shaft was located at the same side in the casing using for driving the devices on super structures like Alternator, hydraulic pump etc. The other output shaft end was located opposite to the input shaft in the same casing and connected hydraulic pump which was in built for loading and unloading of structures.
[052] Instead of loading of the device by conventional methods using by Mechanical or Electrical dynamometer, the hydraulic loading was chosen. The products those having compact in size and not able to mount by regular conventional load testing, this method of hydraulic loading is the preferable and best method. With relevant test fixtures and mounting methods the Hydraulic load testing and also endurance testing for the specified test hours can be executed easily. This method of adaptation of hydraulic loading avoids back to back arrangements of products.
[053] The loading of the PTO at a time for output shaft and for hydraulic pump was done simultaneously by hydraulic oil pressure with precision throttle controllers at output shaft side and at hydraulic pump side. These precision throttle controller controls and varies the oil flow and pressure as per required.
[054] With the empherical formula for power as
(Flow X Pressure)/ 600 in kW
[055] where, Flow is in lpm; Pressure in bar
[056] The power can be estimated as per the required standards.
[057] The input power of the product can also be identified by fixing torque sensor in line and in between of Prime mover and product under load testing.
[058] The formula for calculation of input power:
2*3.14*N*T kW
60 *1000
[059] Where N= input speed of the Prime mover;
[060] T= Torque in Nm (measured by Torque sensor/ Torque Transducer)
[061] Thus the customized rig provides for evaluating the power characteristics of device before usage in equipments and similar products can be used for evaluation of performance and also endurance testing with this test rig.
[062] In addition to this the test rig provides with relief valves connected in line with main supply line to the output shaft loading which provides safety for the excess of pressure building than the rated one by allowing extra oil to the tank (oil reservoir) and safe guarding to the unit under testing and also the test rig.
[063] Motor drives the PTO through propeller shaft and torque transducer. As input rotates, the output also rotates as it is a gear drive. As output shaft starts rotating, the pump also rotates and start sucking the oil from overhead tank and deliver the oil to the overhead tank through flowmeter, relief valve and loading valve. The flow and pressure digital indicator starts showing the flow and pressure in the delivery line.
[064] When loading valve is rotated in clock wise direction manually, it slowly obstructs the flow of oil coming from delivery pipe. This will create in increase in the pressure which in turn demands more driving torque of total test system. The motor will supply required power through PTO to the pump. Thus, the PTO is subjected to load and deliver the power from motor to pump. The loading valve is major playing role here. The flow and pressure values will be utilized for calculating power. The input power from motor to PTO is measured using digital indicator of torque transducer.
[065] The present invention used for testing of Power take off assembly (PTO) which was having input and output shafts at the same side and also in-built pump (for special application) also. The present invention serves that the input will drive both the output shaft and in-built pump. The test arrangement was such a way that which requires hydraulic fluid (oil as working medium) receives from the same hydraulic oil reservoir for the both the output shaft loading and also for in-built pump loading. At the same time both output drives can be loaded with required rated load conditions.
[066] The advantage of this loading device is fine control through loading device. The power is calculated using flow and power rating readings which is very precise.
[067] Numerous modifications and adaptations of the system of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the true spirit and scope of this invention.
,CLAIMS:WE CLAIM:
1. A test rig for power take off (PTO) performance and endurance load test using hydraulic loading comprises (refer figure 1)-
a) Input driving motor (2), wherein motor driving speeds with adjustable variable frequency drive for increasing and decreasing speeds, the motor has start, stop and with emergency stop provisions (2,3),
b) Torque sensor (5) for measurement of Input torque and the speed from the motor and propeller shafts (4) connecting in between the motor to Torque sensor, propeller shafts connecting in between the Torque sensor to PTO with suitable adaption plates for matching PTO torque sensors,
c) Driving units (6) connecting from PTO output shaft to hydraulic pump (for hydraulic loading),
d) Hydraulic pump (7) for loading of output shaft, input torque indicating instrument,
e) Pressure and Flow indicator instrument (8),
f) Pressure relief valves (9) (safety valves) in between the main pump and hydraulic reservoir and in between in built pump (in PTO) and hydraulic reservoir,
g) Cables connecting between the torque sensor and digital indicator and Cables connecting between flow & pressure indicators through indicators for loading pump and for in-built pump,
h) Air compressor (12) connected to PTO for proper gear engagement,
i) Oil chillier unit (13) for cooling of oil,
j) Hydraulic reservoir or over head tank (10) for storing of oil (working fluid for load testing),
k) Throttle controllers (14) for precise control of load for hydraulic pump and for inbuilt pump to PTO.
2. The invention provides precise control of load using the loading device. The resulted power is calculated using flowmeter and pressure gauges. The invention provides testing of PTO (Power take off) used in vehicles as an auxiliary unit. The unit is having input and output shafts and it requires performance test evaluation and endurance load testing at rated load conditions.
3. The test rig for power take off (PTO) performance and endurance load test, as claimed in claim 1, wherein the PTO Type B (power take off) unit is fitted on the Main Gear Box (MGB) of vehicles as an optional attachment as required. The input to PTO Type B is taken from MGB and this unit has two outputs. One output is connected to Hydraulic Pump and other output shaft is used for driving the devices on superstructure like alternator, hydraulic pump etc. The assembly is mounted on to the test rig using the fixture and driven by an electric motor having adequate capacity for the torque & speed requirement. For performance and endurance load testing either by electrical dynamometer or water brake dynamometer separate devices for controlling and indicating is required.
4. The test rig for power take off (PTO) performance and endurance load test, as claimed in claim 1, wherein the loading device consists of PTO output shaft loading Pump mounted on bracket, over head tank (height shall be 1 meter above suction), suction pipe between pump and overhead tank for both main pump and for in-built pump, delivery pipe to overhead tank through flowmeter having flow and pressure pickups, relief valve (a safety device) and loading valve (gate valve), flow and pressure digital indicator and flowmeter reads the flow rate and pressure transducer provides pressure through digital indicator.
5. The test rig for power take off (PTO) performance and endurance load test, as claimed in claim 1, wherein as input rotates, the output also rotates as it is a gear drive, as output shaft starts rotating, the pump also rotates and starts sucking the oil from overhead tank and delivers the oil to the overhead tank through flow meter, relief valve and loading valve and the flow and pressure digital indicator starts showing the flow and pressure in the delivery line.
6. The test rig for power take off (PTO) performance and endurance load test, as claimed in claim 1, wherein when loading valve is rotated in clock wise direction manually, it slowly obstructs the flow of oil coming from delivery pipe which increases the pressure which in turn demands more driving torque of total test system and motor will supply required power through PTO to the pump which is subjected to load and deliver the power from motor to pump.
7. The test rig for power take off (PTO) performance and endurance load test, as claimed in claim 1, wherein actuation of output shaft of the PTO and in built pump is engaged along with input shaft with an aid of the external air supply through Air reservoir and at a time both can be engage and also individually can be engaged with proper air ports by supplying air pressure at the rate of 8 kg/cm².
8. The test rig for power take off (PTO) performance and endurance load test, as claimed in claim 1, wherein the oil cooler connected the delivery side of the main pump and in built pump to the PTO & after cooling the oil will be sent back to the hydraulic reservoir and since the pressure build up and flow variations will be caused with the viscosity index of the oil used in the system. To maintain the oil temperature to the required limits and proper results oil cooler provided in the circuit.
9. The test rig for power take off (PTO) performance and endurance load test, as claimed in claim 1, wherein PTO gear box have one input and two outputs consist of input connected to the Main Gear box unit (MGB) and input and one output shaft was located at the same side in the casing using for driving the devices on super structures and the other output shaft end was located opposite to the input shaft in the same casing and connected hydraulic pump which was in built for loading and unloading of structures.
10. The test rig for power take off (PTO) performance and endurance load test, as claimed in claim 1, wherein the loading of the PTO at a time for output shaft and for hydraulic pump was done simultaneously by hydraulic oil pressure with precision throttle controllers at output shaft side and at hydraulic pump side and these precision throttle controller controls and varies the oil flow and pressure as per required.