CN111537245B - Comprehensive testing system and testing method for fatigue resistance, load resistance and bump resistance of electric vehicle - Google Patents
Comprehensive testing system and testing method for fatigue resistance, load resistance and bump resistance of electric vehicle Download PDFInfo
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- CN111537245B CN111537245B CN202010381916.1A CN202010381916A CN111537245B CN 111537245 B CN111537245 B CN 111537245B CN 202010381916 A CN202010381916 A CN 202010381916A CN 111537245 B CN111537245 B CN 111537245B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/06—Steering behaviour; Rolling behaviour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a comprehensive testing system for fatigue resistance, load resistance and bump resistance of an electric vehicle, which comprises a comprehensive experiment platform, wherein an electric tricycle testing machine is arranged on the comprehensive experiment platform; the electric tricycle testing machine comprises a frame, a front wheel and a pair of rear wheels; a pair of bumpy road section simulators are symmetrically arranged on the left and right sides of the comprehensive experiment platform, and are respectively a left bumpy road section simulator and a right bumpy road section simulator; the height difference between the rotating shaft of the bump machine and the rotating shaft of the road surface simulation roller is in a changing state in real time, so that the heights of bump ridges at the upper end of the bump machine are different when the bump machine rotates to be vertical to the horizontal plane every time, the bump strength of the electric tricycle testing machine is dynamically changed all the time in the process of performing the endurance test, the true bump road section is simulated to the maximum extent, and the limitation of the periodic endurance test of single bump strength is avoided.
Description
Technical Field
The invention belongs to the field of testing of three-wheeled electric vehicles.
Background
The tester of the three-wheeled electric vehicle needs to load the bumping effect when carrying out the durability test, the existing bumping effect can only realize the periodic bumping with single intensity, and the bumping intensity in the actual driving process is dynamic change, so the periodic bumping effect with single intensity can not completely simulate the bumping effect in the actual driving process.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a comprehensive testing system and a testing method for fatigue resistance, load resistance and bump resistance of an electric vehicle with dynamically changed bump strength.
The technical scheme is as follows: in order to achieve the purpose, the comprehensive testing system for fatigue resistance, load resistance and bump resistance of the electric vehicle comprises a comprehensive experiment platform, wherein an electric tricycle testing machine is arranged on the comprehensive experiment platform;
the electric tricycle testing machine comprises a frame, a front wheel and a pair of rear wheels;
a pair of bumpy road section simulators are symmetrically arranged on the left and right sides of the comprehensive experiment platform, and are respectively a left bumpy road section simulator and a right bumpy road section simulator; the pair of rear wheels are respectively a left rear wheel and a right rear wheel;
the left rear wheel is in rolling fit with the left bumpy road section simulator, and the right rear wheel is in rolling fit with the right bumpy road section simulator.
Furthermore, a load water tank is fixedly arranged on a frame of the electric tricycle testing machine, and the electric tricycle testing machine also comprises a water inlet hose and a water outlet hose which are communicated with the load water tank; the water inlet hose and the water outlet hose are both provided with water pumps; the water inlet hose can guide water into the load water tank, and the water outlet hose can pump water in the load water tank, so that the weight of the load water tank is changed.
Further, a front wheel clamp is further arranged on the comprehensive experiment platform and stably clamps a front wheel of the electric tricycle testing machine;
further, the front wheel clamp comprises a left hydraulic cylinder and a right hydraulic cylinder which are horizontally and bilaterally symmetrical; the left and right sides of the front wheel are tightly jacked by the left clamping piece and the right clamping piece respectively.
Further, the bumpy road segment simulator comprises a left motor support and a right motor support which are bilaterally symmetrical; a horizontal left roller motor and a horizontal right roller motor are fixedly arranged on the left motor bracket and the right motor bracket respectively; a road surface simulation roller is coaxially arranged between the left roller motor and the right roller motor; a left output shaft of the left roller motor and a right output shaft of the right roller motor are respectively connected to the road surface simulation roller coaxially, and the left roller motor and the right roller motor jointly drive the road surface simulation roller to rotate; the rear wheel is matched with the outer friction surface of the road surface simulation roller in a rolling way.
Furthermore, a bump device chute is arranged on the road surface simulation drum, the length direction of the bump device chute is parallel to the axis direction of the road surface simulation drum, the bump device chute is communicated along the radial direction of the road surface simulation drum, the cylindrical road surface simulation drum is divided into a left semicircular drum and a right semicircular drum which are bilaterally symmetrical by the bump device chute, and the end part of the left semicircular drum is integrally connected with the end part of the right semicircular drum by a fixed connecting piece; the tail ends of the left output shaft and the right output shaft are fixedly connected to the fixed connecting pieces at two ends of the road surface simulation roller with the same axle center respectively;
a bump is arranged in the bump sliding groove in a sliding mode and can slide along the radial direction of the road simulation roller.
Further, the bump is of a long plate structure, and the plate surface of the long plate structure of the bump is in sliding fit with the inner wall surface of the bump chute; the length direction of the long plate structure of the jounce apparatus is parallel to the axial direction of the road surface simulation drum, and the width direction of the long plate structure of the jounce apparatus is parallel to the radial direction of the road surface simulation drum; two long edges of the long plate structure of the jounce device are jounce ridges; when the bump device slides along the radial direction of the road surface simulation roller, the distance between the bump ridge and the axis of the road surface simulation roller changes;
a left inner rotating ring body is sleeved outside the left output shaft, the inner diameter of the left inner rotating ring body is larger than the outer diameter of the left output shaft, and a left rotating shaft constraint outer ring is sleeved on the outer ring of the left inner rotating ring body through a left bearing in a rotating and rotating manner with the same axis; the axis of the left rotating shaft constraint outer ring is superposed with the orthographic projection of the axis of the left output shaft on the horizontal plane; the left rotating shaft constraint outer ring can do lifting movement, so that the height difference between the axis of the left rotating shaft constraint outer ring and the axis of the left output shaft is changed; the left end of the long plate structure of the jounce apparatus is fixedly connected with the side part of the left inner rotating ring body through two left connecting columns;
a right inner rotating ring body is sleeved outside the right output shaft, the inner diameter of the right inner rotating ring body is larger than the outer diameter of the right output shaft, and a right rotating shaft constraint outer ring is sleeved on the outer ring of the right inner rotating ring body through a right bearing in a rotating and rotating manner with the same axis; the axis of the right rotating shaft constraint outer ring is superposed with the orthographic projection of the axis of the right output shaft on the horizontal plane; the right rotating shaft constraint outer ring can do lifting motion, so that the height difference between the axis of the right rotating shaft constraint outer ring and the axis of the right output shaft is changed; the right end of the long plate structure of the jounce apparatus is fixedly connected with the side part of the right internal rotation ring body through two right connecting columns;
the left rotating shaft constraint outer ring and the right rotating shaft constraint outer ring are always in the coaxial state.
Furthermore, a horizontal lifter bracket is fixed between the lower end of the left motor bracket and the lower end of the right motor bracket; the left hydraulic lifter and the right hydraulic lifter are fixedly arranged on the lifter bracket in a bilateral symmetry manner; the tail end of a left hydraulic lifting rod of the left hydraulic lifter is fixedly connected with the outer ring of the left rotating shaft constraint outer ring, and the tail end of a right hydraulic lifting rod of the right hydraulic lifter is fixedly connected with the outer ring of the right rotating shaft constraint outer ring; the left hydraulic lifter and the right hydraulic lifter can control the left rotating shaft constraint outer ring and the right rotating shaft constraint outer ring to synchronously lift, so that the left rotating shaft constraint outer ring and the right rotating shaft constraint outer ring are always in a coaxial state.
Furthermore, the inner diameters of the left inner rotating ring body and the right inner rotating ring body are D, the outer diameters of the left output shaft and the right output shaft are D, and the requirement that D is smaller than 2D is met.
Further, a testing method of the comprehensive testing system for fatigue resistance, load resistance and bump resistance of the electric vehicle.
The tooling method comprises the following steps: placing the electric tricycle testing machine on a comprehensive experiment platform, and then enabling a left rear wheel to be in rolling fit with a left bumpy road section simulator and enabling a right rear wheel to be in rolling fit with a right bumpy road section simulator; particularly, the lowest end of a rear wheel is pressed against the highest end of a corresponding road surface simulation roller, so that the wheel surface of the rear wheel is in rolling fit with the outer friction surface of the corresponding road surface simulation roller; then simultaneously starting the left hydraulic cylinder and the right hydraulic cylinder to enable the left side and the right side of the front wheel to be tightly pressed by the left clamping sheet and the right clamping sheet respectively, so that the front wheel is stably fixed, and the tool of the electric tricycle testing machine is completed;
the load change method comprises the following steps: the water inlet hose guides water to the load water tank, so that the weight of the load water tank is increased, the load of the electric tricycle testing machine is improved, the water in the load water tank is pumped out by the water outlet hose, the weight of the load water tank is reduced, and the load of the electric tricycle testing machine is reduced;
the dynamic simulation method of the bumpy road section comprises the following steps: starting and operating the electro-tricycle testing machine at a preset power, so as to drive the rear wheels to continuously rotate at the preset power; the rotation of the rear wheel can drive the road surface simulation roller to rotate under the action of rolling friction force, so that the linear velocity of the rear wheel is the same as that of the road surface simulation roller; meanwhile, the left roller motor and the right roller motor apply a resistance torque opposite to the rotation direction to the road surface simulation roller through the left output shaft and the right output shaft, so that the road surface simulation roller forms a stable rotation resistance to the rear wheel, and the rolling friction resistance to the rear wheel when the tricycle is simulated to run is realized;
the road surface simulation drum can drive the bump in the bump chute to rotate along with the rotation of the road surface simulation drum in the process of rotating along the axis of the road surface simulation drum, the rotation speed of the bump is always the same as that of the road surface simulation drum, but the rotation shafts of the bump and the road surface simulation drum are not consistent, the rotation shaft of the road surface simulation drum is always overlapped with the axes of the left output shaft/the right output shaft, the rotation shaft of the bump is always overlapped with the axes of the left rotation shaft constraint outer ring/the right rotation shaft constraint outer ring under the constraint of the left rotation shaft constraint outer ring and the right rotation shaft constraint outer ring, when the rotation shaft of the bump is higher than the height of the road surface simulation drum, the bump ridge at the upper end of the bump is higher than the height of the highest position of the road surface simulation drum every time when the bump rotates to be vertical to the horizontal plane, so that the bump ridge of the bump is upwards pushed up for one time by the rear wheel, the one-time bumping state of the electro-tricycle testing machine is caused, the bumping strength is in positive correlation with the height of a bumping ridge, and the two times of states vertical to the horizontal plane exist in one 360-degree rotation period of the bump, so that the two times of bumping can be caused every time the road surface simulation roller rotates one circle;
in the continuous rotation process of the road surface simulation drum, the left hydraulic lifter and the right hydraulic lifter are synchronously controlled, the left rotating shaft constraint outer ring and the right rotating shaft constraint outer ring synchronously do lifting motion, the rotating shaft of the bump machine is made to do preset lifting motion, the height difference between the rotating shaft of the bump machine and the rotating shaft of the road surface simulation drum is made to be in a change state in real time, the bump machine rotates to be perpendicular to the horizontal plane at every time, the heights of bumps on the upper ends of the bump machine are different, the bump strength of the electric tricycle testing machine in the process of performing durability testing is dynamically changed all the time, the true bump road section is simulated to the maximum extent, and limitation of periodic durability testing of single bump strength is avoided.
Has the advantages that: the height difference between the rotating shaft of the bump machine and the rotating shaft of the road surface simulation roller is in a changing state in real time, so that the heights of bump ridges at the upper end of the bump machine are different when the bump machine rotates to be vertical to the horizontal plane every time, the bump strength of the electric tricycle testing machine is dynamically changed all the time in the process of performing the endurance test, the true bump road section is simulated to the maximum extent, and the limitation of the periodic endurance test of single bump strength is avoided.
Drawings
FIG. 1 is a schematic view of an overall first structure of the test system;
FIG. 2 is a schematic overall second perspective view of the test system;
FIG. 3 is a schematic diagram of the two rear wheels in cooperation with two bump road simulator;
FIG. 4 is a schematic view of a single rear wheel in cooperation with a corresponding bump road simulator (the rear wheel being lifted by a bump ridge of a bump);
FIG. 5 is a front view of FIG. 4;
FIG. 6 is a cross-sectional view of the bumpy road segment simulator taken along the axial direction;
FIG. 7 is a schematic view showing the fitting of the rear wheel to the rear wheel shown in FIG. 6 (the rear wheel being lifted by the bump ridges of the bump);
FIG. 8 is a schematic diagram of a bumpy road simulator;
FIG. 9 is a first cross-sectional view of FIG. 8;
FIG. 10 is a second cross-sectional view of FIG. 8;
FIG. 11 is a schematic structural view of a road surface simulation roller;
FIG. 12 is a cross-sectional view of FIG. 11;
FIG. 13 is a schematic view of the structure of a jounce apparatus.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The comprehensive fatigue, load and bump resistance testing system for the electric vehicle shown in the attached drawings 1 to 13 comprises a comprehensive experiment platform 19, wherein an electric tricycle testing machine 50 is arranged on the comprehensive experiment platform 19; the electric tricycle testing machine 50 includes a frame 23, a front wheel 31, and a pair of rear wheels 16;
a pair of bumpy road section simulators 18 are symmetrically arranged on the comprehensive experiment platform 19 in the left-right direction, and the pair of bumpy road section simulators 18 are a left bumpy road section simulator 18.1 and a right bumpy road section simulator 18.2 respectively; the pair of rear wheels 16 are respectively a left rear wheel 16.1 and a right rear wheel 16.2;
the left rear wheel 16.1 is in rolling engagement with a left jounce road section simulator 18.1 and the right rear wheel 16.2 is in rolling engagement with a right jounce road section simulator 18.2.
The frame 23 of the electric tricycle testing machine 50 is fixedly provided with a load water tank 20, and further comprises a water inlet hose 20 and a water outlet hose 22 which are communicated with the load water tank 20; water pumps are respectively arranged on the water inlet hose 20 and the water outlet hose 22; the inlet hose 20 can introduce water into the load tank 20 and the outlet hose 22 can draw water out of the load tank 20, thereby achieving a change in the weight of the load tank 20.
The comprehensive experiment platform 19 is also provided with a front wheel clamp, and the front wheel clamp stably clamps the front wheel 31 of the electric tricycle testing machine 50;
the front wheel clamp comprises a left hydraulic cylinder 32.1 and a right hydraulic cylinder 32.2 which are horizontal and symmetrical left and right; the end of the left push rod 33.1 of the left hydraulic cylinder 32.1 is fixedly connected with a left clamping piece 34.1, the end of the right push rod of the right hydraulic cylinder 32.2 is fixedly connected with a right clamping piece 34.2, and the left side and the right side of the front wheel 31 are tightly pressed by the left clamping piece 34.1 and the right clamping piece 34.2 respectively.
The bumpy road simulator 18.1 comprises a left motor bracket 3.1 and a right motor bracket 3.2 which are bilaterally symmetrical; a horizontal left roller motor 13.1 and a horizontal right roller motor 13.2 are respectively and fixedly arranged on the left motor bracket 3.1 and the right motor bracket 3.2; a road surface simulation roller 5 is coaxially arranged between the left roller motor 13.1 and the right roller motor 13.2; a left output shaft 8.1 of a left roller motor 13.1 and a right output shaft 8.2 of a right roller motor 13.2 are coaxially connected to the road surface simulation roller 5 respectively, and the left roller motor 13.1 and the right roller motor 13.2 jointly drive the road surface simulation roller 5 to rotate; the rear wheel 16 is in rolling engagement with the outer friction surface 05 of the road surface simulating drum 5.
The road surface simulation drum 5 is provided with a bump device chute 15, the length direction of the bump device chute 15 is parallel to the axis direction of the road surface simulation drum 5, the bump device chute 15 penetrates along the radial direction of the road surface simulation drum 5, the cylindrical road surface simulation drum 5 is divided into a left semicircular drum 5.1 and a right semicircular drum 5.2 which are symmetrical left and right by the bump device chute 15, and the end part of the left semicircular drum 5.1 is integrally connected with the end part of the right semicircular drum 5.2 by a fixed connecting piece 24; the tail ends of the left output shaft 8.1 and the right output shaft 8.2 are fixedly connected to the fixed connecting pieces 24 at the two ends of the road surface simulation roller 5 coaxially;
the jounce apparatus 6 is slidably disposed in the jounce apparatus sliding groove 15, and the jounce apparatus 6 can slide in the radial direction of the road simulation drum 5.
The bump 6 is of a long plate structure, and the plate surface of the long plate structure of the bump 6 is in sliding fit with the inner wall surface of the bump chute 15; the length direction of the long plate structure of the bump machine 6 is parallel to the axial direction of the road surface simulation roller 5, and the width direction of the long plate structure of the bump machine 6 is parallel to the radial direction of the road surface simulation roller 5; the two long sides of the long plate structure of the bump 6 are bump ridges 6.1; when the bump 6 slides along the radial direction of the road surface simulation roller 5, the distance between the bump ridge 6.1 and the axis of the road surface simulation roller 5 changes;
a left inner rotating ring body 10.1 is sleeved outside the left output shaft 8.1, the inner diameter of the left inner rotating ring body 10.1 is larger than the outer diameter of the left output shaft 8.1, and a left rotating shaft constraint outer ring 11.1 is sleeved on the outer ring of the left inner rotating ring body 10.1 in a coaxial rotating and rotating mode through a left bearing 9.1; the orthographic projection of the axis of the left rotating shaft constraint outer ring 11.1 and the axis of the left output shaft 8.1 on the horizontal plane is superposed; the left rotating shaft constraint outer ring 11.1 can do lifting movement, so that the height difference between the axis of the left rotating shaft constraint outer ring 11.1 and the axis of the left output shaft 8.1 is changed; the left end of the long plate structure of the jounce apparatus 6 is fixedly connected with the side part of the left inner rotating ring body 10.1 through two left connecting columns 12.1;
a right inner rotating ring body 10.2 is sleeved outside the right output shaft 8.2, the inner diameter of the right inner rotating ring body 10.2 is larger than the outer diameter of the right output shaft 8.2, and a right rotating shaft constraint outer ring 11.2 is sleeved on the outer ring of the right inner rotating ring body 10.2 in a coaxial rotating and rotating mode through a right bearing 9.2; the orthographic projection of the axis of the right rotating shaft constraint outer ring 11.2 and the axis of the right output shaft 8.2 on the horizontal plane is superposed; the right rotating shaft constraint outer ring 11.2 can do lifting movement, so that the height difference between the axis of the right rotating shaft constraint outer ring 11.2 and the axis of the right output shaft 8.2 is changed; the right end of the long plate structure of the jounce apparatus 6 is fixedly connected with the side part of the right internal rotating ring body 10.2 through two right connecting columns 12.2;
the left rotating shaft constraint outer ring 11.1 and the right rotating shaft constraint outer ring 11.2 are always in a coaxial state.
A horizontal lifter bracket 2 is fixed between the lower end of the left motor bracket 3.1 and the lower end of the right motor bracket 3.2; a left hydraulic lifter 1.1 and a right hydraulic lifter 1.2 are symmetrically and fixedly arranged on the lifter bracket 2; the tail end of a left hydraulic lifting rod 4.1 of the left hydraulic lifter 1.1 is fixedly connected with the outer ring of the left rotating shaft restraint outer ring 11.1, and the tail end of a right hydraulic lifting rod 4.2 of the right hydraulic lifter 1.2 is fixedly connected with the outer ring of the right rotating shaft restraint outer ring 11.2; the left hydraulic lifter 1.1 and the right hydraulic lifter 1.2 can control the left rotating shaft constraint outer ring 11.1 and the right rotating shaft constraint outer ring 11.2 to synchronously lift, so that the left rotating shaft constraint outer ring 11.1 and the right rotating shaft constraint outer ring 11.2 are always in a coaxial state.
The inner diameters of the left inner rotating ring body 10.1 and the right inner rotating ring body 10.2 are D, the outer diameters of the left output shaft 8.1 and the right output shaft 8.2 are D, and the requirement that D is smaller than 2D is met. The height difference between the rotating shaft of the jounce apparatus 6 and the rotating shaft of the road surface simulation roller 5 has a large enough variation range, so that the jounce intensity of the tricycle has a sufficient variation range.
The testing method and the working principle of the comprehensive fatigue, load and bump resistance testing system of the electric vehicle are as follows:
the tooling method comprises the following steps: the electro-tricycle testing machine 50 is placed on the comprehensive experiment platform 19, and then the left rear wheel 16.1 is in rolling fit with the left bumpy road section simulator 18.1, and the right rear wheel 16.2 is in rolling fit with the right bumpy road section simulator 18.2; specifically, the lowest end of the rear wheel 16 is pressed against the highest end of the corresponding road surface simulation roller 5, so that the wheel surface of the rear wheel 16 is in rolling fit with the outer friction surface 05 of the corresponding road surface simulation roller 5; then, the left hydraulic cylinder 32.1 and the right hydraulic cylinder 32.2 are started simultaneously, so that the left side and the right side of the front wheel 31 are tightly pressed by the left clamping sheet 34.1 and the right clamping sheet 34.2 respectively, the front wheel 31 is stably fixed, and the tool of the electric tricycle testing machine 50 is completed;
the load change method comprises the following steps: the water inlet hose 20 guides water to the load water tank 20, so that the weight of the load water tank 20 is increased, the load of the electric tricycle testing machine 50 is improved, the water in the load water tank 20 is pumped out by the water outlet hose 22, the weight of the load water tank 20 is reduced, and the load of the electric tricycle testing machine 50 is reduced;
the dynamic simulation method of the bumpy road section comprises the following steps: starting and operating the electro-tricycle testing machine 50 at a predetermined power, thereby driving the rear wheels 16 to continuously rotate at a predetermined power; the rotation of the rear wheel 16 drives the road surface simulation roller 5 to rotate under the action of rolling friction force, so that the linear velocity of the rear wheel 16 is the same as that of the road surface simulation roller 5; meanwhile, the left roller motor 13.1 and the right roller motor 13.2 apply a resistance torque opposite to the rotation direction to the road surface simulation roller 5 through the left output shaft 8.1 and the right output shaft 8.2, so that the road surface simulation roller 5 forms a stable rotation resistance to the rear wheel 16, and the rolling friction resistance of the road surface simulation roller to the rear wheel 16 when the tricycle is simulated to run is realized;
the road surface simulation roller 5 can drive the bump machine 6 in the bump machine sliding groove 15 to follow the rotation in the process of rotating along the axis of the road surface simulation roller 5, and the rotating speed of the bump machine 6 is always the same as that of the road surface simulation roller 5, but the rotating shafts of the bump machine 6 and the road surface simulation roller 5 are not consistent, the rotating shaft of the road surface simulation roller 5 is always coincident with the axis of the left output shaft 8.1/the right output shaft 8.2, and under the constraint of the left rotating shaft constraint outer ring 11.1 and the right rotating shaft constraint outer ring 11.2, the rotating shaft of the bump machine 6 is always coincident with the axis of the left rotating shaft constraint outer ring 11.1/the right rotating shaft constraint outer ring 11.2, when the rotating shaft of the bump machine 6 is higher than the height of the road surface simulation roller 5, when the bump machine 6 rotates to be vertical to the horizontal plane each time, the bump ridge 6.1 at the upper end of the bump machine 6 is higher than the height of the highest position of the road surface simulation roller 5, therefore, the bumping ridge 6.1 at the upper end of the bumping device 6 jacks up the rear wheel 16 once, so that a one-time bumping state of the electric tricycle testing machine 50 is caused, the bumping strength is in positive correlation with the height of the bumping ridge 6.1, and a state vertical to the horizontal plane is caused twice in a 360-degree rotation period of the bumping device 6, so that twice bumping can be caused every time the road surface simulation roller 5 rotates one circle;
in the continuous rotation process of the road surface simulation roller 5, the left hydraulic lifter 1.1 and the right hydraulic lifter 1.2 are synchronously controlled, the left rotating shaft constraint outer ring 11.1 and the right rotating shaft constraint outer ring 11.2 synchronously do lifting motion, so that the rotating shaft of the jounce device 6 does preset lifting motion, the height difference between the rotating shaft of the jounce device 6 and the rotating shaft of the road surface simulation roller 5 is in a changing state in real time, and the heights of the jounce ridges 6.1 at the upper end of the jounce device 6 are different when the jounce device 6 rotates to be vertical to the horizontal plane every time, so that the jounce strength borne by the electric tricycle 50 in the endurance test process is dynamically changed all the time, the true jounce road section is simulated to the maximum extent, and the limitation of the periodic endurance test of single jounce strength is avoided.
The above is only a preferred embodiment of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (5)
1. Electric motor car is able to bear or endure fatigue, load and anti comprehensive test system that jolts, its characterized in that: the device comprises a comprehensive experiment platform (19), wherein an electric tricycle testing machine (50) is arranged on the comprehensive experiment platform (19);
the electric tricycle testing machine (50) comprises a frame (23), a front wheel (31) and a pair of rear wheels (16);
a pair of bumpy road section simulators (18) are symmetrically arranged on the left and right of the comprehensive experiment platform (19), and the pair of bumpy road section simulators (18) are a left bumpy road section simulator (18.1) and a right bumpy road section simulator (18.2) respectively; the pair of rear wheels (16) are respectively a left rear wheel (16.1) and a right rear wheel (16.2);
the left rear wheel (16.1) is in rolling fit with the left bump road section simulator (18.1), and the right rear wheel (16.2) is in rolling fit with the right bump road section simulator (18.2);
a load water tank (20) is fixedly arranged on a frame (23) of the electric tricycle testing machine (50), and the electric tricycle testing machine also comprises a water inlet hose (21) and a water outlet hose (22) which are communicated with the load water tank (20); water pumps are respectively arranged on the water inlet hose (21) and the water outlet hose (22); the water inlet hose (21) can guide water into the load water tank (20), and the water outlet hose (22) can pump water out of the load water tank (20), so that the weight of the load water tank (20) can be changed;
the comprehensive experiment platform (19) is also provided with a front wheel clamp, and the front wheel clamp stably clamps a front wheel (31) of the electric tricycle testing machine (50);
the front wheel clamp comprises a left hydraulic cylinder (32.1) and a right hydraulic cylinder (32.2) which are horizontal and symmetrical left and right; the tail end of a left push rod (33.1) of the left hydraulic cylinder (32.1) is fixedly connected with a left clamping piece (34.1), the tail end of a right push rod of the right hydraulic cylinder (32.2) is fixedly connected with a right clamping piece (34.2), and the left side and the right side of the front wheel (31) are tightly pressed by the left clamping piece (34.1) and the right clamping piece (34.2) respectively;
the bumpy road simulator (18) comprises a left motor support (3.1) and a right motor support (3.2) which are bilaterally symmetrical; a horizontal left roller motor (13.1) and a horizontal right roller motor (13.2) are respectively and fixedly arranged on the left motor bracket (3.1) and the right motor bracket (3.2); a road surface simulation roller (5) is coaxially arranged between the left roller motor (13.1) and the right roller motor (13.2); a left output shaft (8.1) of the left roller motor (13.1) and a right output shaft (8.2) of the right roller motor (13.2) are respectively coaxially connected to the road surface simulation roller (5), and the left roller motor (13.1) and the right roller motor (13.2) jointly drive the road surface simulation roller (5) to rotate; the rear wheel (16) is matched with an external friction surface (05) of the road surface simulation roller (5) in a rolling way;
the road surface simulation drum (5) is provided with a bumping device sliding chute (15), the length direction of the bumping device sliding chute (15) is parallel to the axis direction of the road surface simulation drum (5), the bumping device sliding chute (15) is communicated along the radial direction of the road surface simulation drum (5), the cylindrical road surface simulation drum (5) is divided into a left semicircular drum (5.1) and a right semicircular drum (5.2) which are bilaterally symmetrical by the bumping device sliding chute (15), and the end part of the left semicircular drum (5.1) is integrally connected with the end part of the right semicircular drum (5.2) through a fixed connecting piece (24); the tail ends of the left output shaft (8.1) and the right output shaft (8.2) are respectively and coaxially fixedly connected to fixed connecting pieces (24) at two ends of the road surface simulation roller (5);
the jounce device (6) is arranged in the jounce device sliding groove (15) in a sliding mode, and the jounce device (6) can slide along the radial direction of the road surface simulation roller (5).
2. The electric vehicle fatigue, load and bump resistance comprehensive test system according to claim 1, characterized in that: the bump (6) is of a long plate structure, and the plate surface of the long plate structure of the bump (6) is in sliding fit with the inner wall surface of the bump sliding groove (15); the length direction of the long plate structure of the jounce apparatus (6) is parallel to the axial direction of the road surface simulation roller (5), and the width direction of the long plate structure of the jounce apparatus (6) is parallel to the radial direction of the road surface simulation roller (5); the two long sides of the long plate structure of the jounce apparatus (6) are jounce ridges (6.1); when the bump (6) slides along the radial direction of the road surface simulation roller (5), the distance between the bump ridge (6.1) and the axis of the road surface simulation roller (5) changes;
a left inner rotating ring body (10.1) is sleeved outside the left output shaft (8.1), the inner diameter of the left inner rotating ring body (10.1) is larger than the outer diameter of the left output shaft (8.1), and a left rotating shaft constraint outer ring (11.1) is sleeved on the outer ring of the left inner rotating ring body (10.1) in a coaxial rotating and rotating mode through a left bearing (9.1); the axis of the left rotating shaft constraint outer ring (11.1) is superposed with the orthographic projection of the axis of the left output shaft (8.1) on the horizontal plane; the left rotating shaft constraint outer ring (11.1) can do lifting movement, so that the height difference between the axis of the left rotating shaft constraint outer ring (11.1) and the axis of the left output shaft (8.1) is changed; the left end of the long plate structure of the jounce apparatus (6) is fixedly connected with the side part of the left inner rotating ring body (10.1) through two left connecting columns (12.1);
a right inner rotating ring body (10.2) is sleeved outside the right output shaft (8.2), the inner diameter of the right inner rotating ring body (10.2) is larger than the outer diameter of the right output shaft (8.2), and a right rotating shaft constraint outer ring (11.2) is sleeved on the outer ring of the right inner rotating ring body (10.2) in a coaxial rotating and rotating mode through a right bearing (9.2); the axis of the right rotating shaft constraint outer ring (11.2) is superposed with the orthographic projection of the axis of the right output shaft (8.2) on the horizontal plane; the right rotating shaft constraint outer ring (11.2) can do lifting movement, so that the height difference between the axis of the right rotating shaft constraint outer ring (11.2) and the axis of the right output shaft (8.2) is changed; the right end of the long plate structure of the jounce apparatus (6) is fixedly connected with the side part of the right inner rotating ring body (10.2) through two right connecting columns (12.2);
the left rotating shaft constraint outer ring (11.1) and the right rotating shaft constraint outer ring (11.2) are always in the coaxial state.
3. The electric vehicle fatigue, load and bump resistance comprehensive test system according to claim 2, characterized in that: a horizontal lifter bracket (2) is fixed between the lower end of the left motor bracket (3.1) and the lower end of the right motor bracket (3.2); a left hydraulic lifter (1.1) and a right hydraulic lifter (1.2) are symmetrically and fixedly arranged on the lifter support (2) from left to right; the tail end of a left hydraulic lifting rod (4.1) of the left hydraulic lifter (1.1) is fixedly connected with the outer ring of the left rotating shaft constraint outer ring (11.1), and the tail end of a right hydraulic lifting rod (4.2) of the right hydraulic lifter (1.2) is fixedly connected with the outer ring of the right rotating shaft constraint outer ring (11.2); the left hydraulic lifter (1.1) and the right hydraulic lifter (1.2) can control the left rotating shaft constraint outer ring (11.1) and the right rotating shaft constraint outer ring (11.2) to synchronously lift, so that the left rotating shaft constraint outer ring (11.1) and the right rotating shaft constraint outer ring (11.2) are always in a coaxial state.
4. The electric vehicle fatigue, load and bump resistance comprehensive test system according to claim 3, characterized in that: the inner diameters of the left inner rotating ring body (10.1) and the right inner rotating ring body (10.2) are D, and the outer diameters of the left output shaft (8.1) and the right output shaft (8.2) are D, so that the requirement that 2D is less than D is met.
5. The testing method of the comprehensive fatigue, load and bump resistance testing system for the electric vehicle as claimed in claim 4, wherein the testing method comprises the following steps:
the tooling method comprises the following steps: the testing machine (50) of the electric tricycle is placed on a comprehensive experiment platform (19), then a left rear wheel (16.1) is in rolling fit with a left bumpy road section simulator (18.1), and a right rear wheel (16.2) is in rolling fit with a right bumpy road section simulator (18.2); particularly, the lowest end of a rear wheel (16) is pressed against the highest end of the corresponding road surface simulation roller (5), and the wheel surface of the rear wheel (16) is matched with the outer friction surface (05) of the corresponding road surface simulation roller (5) in a rolling way; then simultaneously starting a left hydraulic cylinder (32.1) and a right hydraulic cylinder (32.2) to enable the left side and the right side of the front wheel (31) to be tightly pressed by a left clamping sheet (34.1) and a right clamping sheet (34.2) respectively, so that the front wheel (31) is stably fixed, and the tool for the electric tricycle testing machine (50) is completed;
the load change method comprises the following steps: the water inlet hose (21) guides water to the load water tank (20), so that the weight of the load water tank (20) is increased, the load of the electric tricycle testing machine (50) is improved, the water in the load water tank (20) is pumped out by the water outlet hose (22), the weight of the load water tank (20) is reduced, and the load of the electric tricycle testing machine (50) is reduced;
the dynamic simulation method of the bumpy road section comprises the following steps: starting and operating the electro-tricycle testing machine (50) with a predetermined power, thereby driving the rear wheels (16) to rotate continuously with a predetermined power; the rotation of the rear wheel (16) drives the road surface simulation roller (5) to rotate under the action of rolling friction force, so that the linear velocity of the rear wheel (16) is the same as that of the road surface simulation roller (5); meanwhile, the left roller motor (13.1) and the right roller motor (13.2) apply a resistance torque opposite to the rotation direction to the road surface simulation roller (5) through the left output shaft (8.1) and the right output shaft (8.2), so that the road surface simulation roller (5) forms a stable rotation resistance to the rear wheel (16), and the rolling friction resistance to the rear wheel (16) during running of the simulated tricycle is realized;
the road surface simulation roller (5) can drive the bump device (6) in the bump device sliding groove (15) to rotate along the axis of the road surface simulation roller (5) in the process of rotating along the axis of the road surface simulation roller, the rotating speed of the bump device (6) is always the same as that of the road surface simulation roller (5), but the rotating shafts of the bump device (6) and the road surface simulation roller (5) are not consistent, the rotating shaft of the road surface simulation roller (5) is always overlapped with the axes of a left output shaft (8.1)/a right output shaft (8.2), the rotating shaft of the bump device (6) is always overlapped with the axes of a left rotating shaft constraint outer ring (11.1)/a right rotating shaft constraint outer ring (11.2) under the constraint of the left rotating shaft constraint outer ring (11.1) and the right rotating shaft constraint outer ring (11.2), when the rotating shaft of the bump device (6) is higher than the height of the road surface simulation roller (5), the bump device (6) rotates to be vertical to the horizontal plane each time, the bumping ridge (6.1) at the upper end of the bumping device (6) is higher than the highest position of the road surface simulation drum (5), so that the bumping ridge (6.1) at the upper end of the bumping device (6) jacks up the rear wheel (16) for one time, a one-time bumping state of the electric tricycle testing machine (50) is caused, the bumping strength is positively correlated with the height of the bumping ridge (6.1), and a 360-degree rotation period of the bumping device (6) has two times of states vertical to the horizontal plane, so that two times of bumping can be caused when the road surface simulation drum (5) rotates for one circle;
in the process of continuous rotation of the road surface simulation roller (5), synchronously controlling a left hydraulic lifter (1.1) and a right hydraulic lifter (1.2) to enable a left rotating shaft constraint outer ring (11.1) and a right rotating shaft constraint outer ring (11.2) to synchronously do lifting motion, thereby enabling a rotating shaft of a jounce device (6) to do preset lifting motion, so that the height difference between the rotating shaft of the bump machine (6) and the rotating shaft of the road surface simulation roller (5) is in a changing state in real time, when the bump machine (6) rotates to be vertical to the horizontal plane each time, the heights of the bumping ridges (6.1) at the upper ends of the bumping devices (6) are different, so that the bumping strength of the electro-tricycle testing machine (50) in the endurance test process is dynamically changed all the time, therefore, the real bumpy road section can be simulated to the maximum extent, and the limitation of periodic durability test of single bump strength is avoided.
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| CN113758667B (en) * | 2021-09-06 | 2022-05-03 | 江西应用技术职业学院 | Electric drive assembly testing arrangement |
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| CN2556625Y (en) * | 2002-07-30 | 2003-06-18 | 重庆宗申技术开发研究有限公司 | Copression interference detector for motorcycle |
| CN106706336B (en) * | 2016-12-22 | 2023-12-22 | 江苏金彭集团有限公司 | Integrated vibration test platform for electric vehicle |
| CN107806974A (en) * | 2017-12-08 | 2018-03-16 | 孙健春 | A kind of spacing fastener of protected tyre bounce |
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Denomination of invention: A Comprehensive Testing System and Method for Fatigue, Load, and Bump Resistance of Electric Vehicles Effective date of registration: 20230914 Granted publication date: 20220104 Pledgee: WUXI BRANCH, INDUSTRIAL BANK CO.,LTD. Pledgor: Jiangsu Anwa Technology Co.,Ltd. Registration number: Y2023980056532 |