CN115046664B - Chassis dynamometer with adjustable single-roller four-wheel-drive wheelbase - Google Patents
Chassis dynamometer with adjustable single-roller four-wheel-drive wheelbase Download PDFInfo
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- CN115046664B CN115046664B CN202210978864.5A CN202210978864A CN115046664B CN 115046664 B CN115046664 B CN 115046664B CN 202210978864 A CN202210978864 A CN 202210978864A CN 115046664 B CN115046664 B CN 115046664B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- Chemical & Material Sciences (AREA)
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- Combustion & Propulsion (AREA)
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The utility model provides a single cylinder four wheel drive wheel base adjustable chassis dynamometer, sets up in the pit for the output of detection vehicle, the chassis dynamometer is including removing rotary drum group and fixed rotary drum group, fixed rotary drum group fixes the bottom at the pit, fixed rotary drum group fixed connection is in the bottom of pit, it sets up the offside at fixed rotary drum group to remove rotary drum group, it removes the guide rail to be provided with rotary drum group between the bottom of removal rotary drum group and pit, through rotary drum group remove guide rail sliding connection in the pit, be provided with rotary drum group axle base adjusting device between removal rotary drum group and the fixed rotary drum group, rotary drum group axle base adjusting device also fixes in the pit bottom, rotary drum group axle base adjusting device is connected with removal rotary drum group, rotary drum group axle base adjusting device can drag removal rotary drum group and slide along group removal guide rail for the interval between control removal rotary drum group and the fixed rotary drum group is tested to satisfy different axle base experimental vehicles.
Description
Technical Field
The invention relates to the field of inspection tables of chassis dynamometers, in particular to a chassis dynamometer with an adjustable single-roller four-drive wheel base.
Background
The chassis dynamometer is a detection device mainly used for a vehicle chassis output power experiment, a road resistance simulation experiment and a vehicle emission experiment under different operating conditions.
At present, most of domestic chassis dynamometer adopt a double-drum mode, and a four-wheel drive chassis dynamometer detection device suitable for different wheelbases is disclosed in a novel faithful application patent CN207540795U, namely the double-drum mode is adopted. When the double-drum mode chassis dynamometer is used for vehicle detection, each wheel of the vehicle has two contact supporting points in the experimental process, the power loss is large in the detection process, and the output power of the chassis or the accurate road resistance simulation cannot be measured with high accuracy.
Moreover, the dynamometer in the double-drum mode has large power loss, so that the data fluctuation is large during the low-speed chassis output power experiment, the detection requirement cannot be met, and the low-speed chassis power detection cannot be realized; in the vehicle speed measurement, the highest vehicle speed of a road surface cannot be truly simulated due to power loss, and the detected data can deviate from the actual performance of the vehicle.
Disclosure of Invention
In order to solve the problems, the invention provides a chassis dynamometer with an adjustable single-roller four-wheel drive wheelbase.
The technical scheme of the invention is as follows:
the chassis dynamometer with the adjustable single-roller four-wheel drive wheelbase is arranged in a pit and used for detecting the output power of a vehicle, and comprises a movable rotary drum group and a fixed rotary drum group, wherein the fixed rotary drum group is fixed at the bottom of the pit, the fixed rotary drum group is fixedly connected at the bottom of the pit, the movable rotary drum group is arranged at the opposite side of the fixed rotary drum group, a rotary drum group movable guide rail is arranged between the movable rotary drum group and the bottom of the pit and is connected in the pit in a sliding manner through the rotary drum group movable guide rail, a rotary drum group wheelbase adjusting device is arranged between the movable rotary drum group and the fixed rotary drum group and is also fixed at the bottom of the pit, the rotary drum group wheelbase adjusting device is connected with the movable rotary drum group, and can drag the movable rotary drum group to slide along the movable guide rail of the rotary drum group for controlling the distance between the movable rotary drum group and the fixed rotary drum group so as to meet the experiment of experimental vehicles with different wheelbases.
The chassis dynamometer with the adjustable single-roller four-wheel-drive wheelbase comprises a moving rotary drum group and a fixed rotary drum group, wherein the moving rotary drum group and the fixed rotary drum group are respectively composed of a rotary roller group rack and a power detection unit, the power detection unit comprises a rotary roller shaft and a torque motor, the rotary roller shaft is transversely and rotatably connected to the rotary roller group rack, two ends of the rotary roller shaft are respectively and rotatably connected with a rotary roller, the moving rotary drum group and the fixed rotary drum group are of single-roller structures, only one contact point is arranged on a wheel of a detected vehicle, compared with a double-roller mode, the running state of the vehicle on the road surface can be simulated more truly, the rotary rollers are arranged below corresponding wheels, the rotary rollers are in contact connection with corresponding wheels, the rotary roller shafts are rotatably connected with rotors of the torque motors, when the output power of the vehicle is detected, the wheels are in contact with the rotary rollers to drive the rotary rollers to rotate, the rotary rollers further drive the rotary roller shafts to rotate, finally the torque motors to absorb the rotary power transmitted by the rotary roller shafts, the torque sensors and the speed sensors to calculate the real-time output power of the vehicle chassis, and different resistances are loaded to simulate the running experiment of the vehicle;
the chassis dynamometer machine is characterized in that a set of wheel aligning and positioning device is arranged around each rotating roller, the wheels are pushed to each rotating roller through the wheel aligning and positioning devices, each wheel aligning and positioning device comprises two sets of rotary drum devices, the two sets of rotary drum devices are bilaterally symmetrical with the circle center of the rotating roller, the rotary drum devices are identical in structure and comprise telescopic cylinders, positioning plates and positioning rollers, the positioning plates are attached to the surfaces of the rotating rollers and can slide up and down along the surfaces of the rotating rollers, the positioning rollers are rotatably connected to the upper end edges of the positioning plates and are in contact connection with the wheels of vehicles, friction is small, and good guidance is achieved.
Further, the locating plate includes arc board and location engaging lug, the shape of arc board is arc, and the cross-section that rotates the cylinder with corresponding is same centre of a circle, makes arc board can be circular motion around the rotation cylinder that corresponds, the upper end edge rotation of arc board is connected with the registration roller, the perpendicular downside edge of connecting at the arc board of location engaging lug, wheel alignment positioner still includes the guide seat, the guide seat sets up the both sides at the arc board, the guide seat is provided with the guiding groove towards one side of arc board, and opposite side fixed connection is in the roller set frame, the shape of guiding groove cooperatees with the marginal shape of arc board, the guide seat can provide the support for the locating plate, makes the arc board of locating plate can follow the guiding groove and carry out circular motion around rotating the cylinder.
The edge of the two sides of the arc plate part is provided with a plurality of vertical guide bearings and horizontal guide bearings, the rotation axes of the vertical guide bearings and the horizontal guide bearings are perpendicular to each other, the vertical guide bearings are in contact connection with the upper surface and the lower surface of the inner side of the guide groove, the vertical guide bearings can reduce the friction force between the arc plate part and the upper surface and the lower surface of the guide groove, the upper surface and the lower surface of the arc plate part are prevented from being in direct contact with the guide groove, the horizontal guide bearings are in contact connection with the side surface of the inner side of the guide groove, the vertical guide bearings can reduce the friction force between the arc plate part and the upper side surface and the lower side surface of the guide groove, and the edge of the arc plate part is prevented from being in direct contact with the inner side surface of the guide groove.
In order to carry out timely braking, every to the rotary drum the inboard of rotary drum all is provided with a set of arresting gear, arresting gear includes brake pedestal, lifting gasbag, crane and brake shoe, brake pedestal fixed connection is in the rotary roll group frame, brake shoe fixed connection is on the upper surface of crane, the shape of brake shoe cooperatees with the inboard shape of rotary drum, the lifting gasbag sets up between crane and brake pedestal, crane and brake pedestal elastic connection, the lifting gasbag has the brake air pump through the pipe connection.
The low-speed rotary drum driving device is arranged in the rotary roller group rack and comprises a driving motor, the driving motor is fixedly installed in the rotary roller group rack, and an output shaft of the driving motor is connected with the rotary roller shaft through a chain so as to adjust the position of the vehicle to be detected on the chassis dynamometer and ensure the safety of the detection process.
The roller group frame is fixedly connected with a speed measuring assembly, the speed measuring assembly comprises a speed sensor, the speed sensor is arranged at one end of the roller shaft and is coaxially connected with the roller shaft, and the speed measuring assembly can measure the instantaneous rotating speed of the roller shaft.
The roller set frame is also internally provided with a force sensor assembly, one end of the force sensor assembly is rotationally connected with the roller set frame, the other end of the force sensor assembly is rotationally connected with a shell of the torque motor, and the force sensor assembly is used for detecting the reverse disengaging force of the torque motor.
And one side of the fixed rotary drum group, which faces the movable rotary drum group, is provided with a distance sensor, and the distance sensor is used for detecting the distance between the movable rotary drum group and the fixed rotary drum group in the pit.
Compared with the prior art, the invention has the following beneficial effects:
1. the chassis dynamometer with the adjustable single-roller four-wheel-drive wheelbase has the advantages that a movable rotary drum group and a fixed rotary drum group of the chassis dynamometer are respectively provided with 2 rotary rollers, and the total number of the rotary rollers is four, so that the power on four wheels of one vehicle can be detected simultaneously, and a detection experiment can be carried out on four-wheel-drive vehicles;
2. according to the chassis dynamometer with the adjustable single-roller four-wheel-drive wheelbase, a wheelbase adjusting device of the drum set is arranged between a movable drum set and a fixed drum set of the chassis dynamometer, so that the distance between the movable drum set and the fixed drum set can be adjusted, and the chassis dynamometer can be applied to detection of vehicles with different wheelbases;
3. compared with a double-drum mode of a traditional dynamometer, the chassis dynamometer with the single-drum four-wheel-drive wheelbase adjustable adopts a single-drum structure, can simulate the running condition of a vehicle on a road more truly, has lower power loss and is more accurate in power detection of the vehicle;
4. the chassis dynamometer with the adjustable single-roller four-wheel-drive wheelbase is provided with the group of wheel alignment positioning devices around each rotating roller, and is used for pushing a vehicle of a tested vehicle to be right above the rotating roller to be in contact with the rotating roller before formal power test is started.
Drawings
The aspects and advantages of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
In the drawings:
FIG. 1 is a schematic structural diagram of a chassis dynamometer with an adjustable single-roller four-wheel drive wheelbase in embodiment 1;
fig. 2 is a schematic view of an internal structure of the chassis dynamometer described in embodiment 1;
FIG. 3 is a schematic view of the structure of the moving drum set in embodiment 1;
FIG. 4 is a schematic structural view of the fixed drum set in example 1;
FIG. 5 is a schematic structural view of the braking apparatus according to embodiment 1;
FIG. 6 is a side view of the braking apparatus according to embodiment 1;
fig. 7 is a schematic structural view of the positioning plate in embodiment 1;
FIG. 8 is a side view of the positioning plate of embodiment 1;
the components represented by the reference numerals in the figures are:
1. a pit; 2. moving the rotary drum set; 21. an extension plate; 22. a drum set moving guide rail; 3. fixing the rotary drum set; 4. a turning roll group frame; 5. a power detection unit; 51. a roller shaft; 52. a torque motor; 53. rotating the drum; 6. a rotary drum group shaft distance adjusting device; 61. an adjusting cylinder; 62. a distance sensor; 7. a wheel alignment positioning device; 71. a drum device; 72. a telescopic cylinder; 73. positioning a plate; 74. a positioning roller; 75. an arc plate portion; 76. positioning the connecting lug; 77. a guide seat; 771. a guide groove; 772. a vertical guide bearing; 773. a horizontal guide bearing; 8. a braking device; 81. a brake pad base; 82. lifting the air bag; 83. a lifting frame; 84. a brake shoe; 9. a low-speed drum drive; 91. a drive motor; 10. a speed measuring component; 101. a rotational speed sensor; 11. a force sensor assembly.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1-8, the chassis dynamometer with an adjustable single-roller four-drive wheel base is arranged in a pit 1 and used for detecting output power of a vehicle, and includes a moving drum set 2 and a fixed drum set 3, the fixed drum set 3 is fixed at the bottom of the pit 1, the fixed drum set 3 is fixedly connected at the bottom of the pit 1, the moving drum set 2 is arranged at the opposite side of the fixed drum set 3, a drum set moving guide rail 22 is arranged between the moving drum set 2 and the bottom of the pit 1 and is slidably connected in the pit 1 through the drum set moving guide rail 22, a drum set wheel base adjusting device 6 is arranged between the moving drum set 2 and the fixed drum set 3, the drum set wheel base adjusting device 6 is also fixed at the bottom of the pit 1, the drum set wheel base adjusting device 6 is connected with the moving drum set 2, and the drum set wheel base adjusting device 6 can drag the moving drum set 2 to slide along the drum set moving guide rail 22 and is used for controlling the distance between the moving drum set 2 and the fixed drum set 3 so as to meet the requirements of different wheel base experiments.
Preferably, extension plates 21 are arranged on the side facing the fixed drum group 3 and the side facing the edge of the pit 1 above the moving drum group 2, the extension plate 21 facing the fixed drum group 3 is connected with the upper surface of the fixed drum group 3 in a sliding manner, the extension plate 21 facing the edge of the pit 1 is connected with the upper surface of the edge of the pit 1 in a sliding manner, so that the vehicle can normally and stably run above the chassis dynamometer,
referring to fig. 2-5, the moving drum set 2 and the fixed drum set 3 are both composed of a roller set frame 4 and a power detection unit 5, the power detection unit 5 includes a roller shaft 51 and a torque motor 52, the roller shaft 51 is transversely and rotatably connected to the roller set frame 4, two ends of the roller shaft 51 are respectively and rotatably connected to a rotating drum 53, the moving drum set 2 and the fixed drum set 3 are both of a single-drum structure, and have only one contact point with a wheel of a vehicle to be detected, compared with a double-drum mode, the state of vehicle road running can be simulated more truly, the vehicle power loss is smaller in the detection process, the detection value is more accurate, the rotating drum 53 is arranged below the corresponding wheel, the rotating drum 53 is in contact with the corresponding wheel, the roller shaft 51 is rotatably connected with a rotor of the torque motor 52, when the output power of the vehicle is detected, the wheel is in contact with the rotating drum 53, the rotating drum 53 drives the rotating drum 51 to rotate, and finally the torque motor 52 absorbs the rotating power transmitted by the roller shaft 51, and the speed sensor, and calculates the running resistance of the vehicle through real-time loading experiments to simulate a road running chassis;
preferably, the rotating drum set axial distance adjusting device 6 comprises an adjusting cylinder 61, the adjusting cylinder 61 is transversely installed at the bottom of the pit 1 and fixed at the bottom of the pit 1 through bolts, an extension rod of the adjusting cylinder is connected with the rotating drum set frame 4 of the movable rotating drum set 2, and the center distance of the rotating drum set 2 and the rotating drum shaft 51 of the fixed rotating drum set 3 can be moved through the extension and retraction of the adjusting cylinder 61, so as to meet the detection requirements of vehicles with different axial distances.
Further, a distance sensor 62 is arranged on one side of the fixed drum group 3 facing the movable drum group 2, and the distance sensor 62 is used for detecting the distance between the movable drum group 2 and the fixed drum group 3 in the pit 1, so that the drum group axis distance adjusting device 6 can correctly adjust the distance between the movable drum group 2 and the fixed drum group 3, and the chassis dynamometer can adapt to vehicles with different axis distances for carrying out experiments.
Before the power detection of the whole vehicle is carried out by the traditional dynamometer, the wheels of the vehicle need to be moved above the rotating rollers to enable the wheels to be in contact with the top ends of the rotating rollers, then the power detection of the whole vehicle can be formally started after the vehicle is fixed by using binding bands, the process is complicated, and the whole detection work efficiency is not high, so that the chassis dynamometer is provided with a group of wheel aligning and positioning devices 7 around each rotating roller 53, referring to fig. 4, the wheels are pushed to the top ends of each rotating roller 53 by using the wheel aligning and positioning devices 7, each group of wheel aligning and positioning devices 7 comprises two groups of rotating drum devices 71, the two groups of rotating drum devices 71 are bilaterally symmetrical by the circle center of the rotating roller 53, the two groups of rotating drum devices 71 have the same structure, the rotary drum device 71 comprises a telescopic cylinder 72, a positioning plate 73 and positioning rollers 74, the positioning plate 73 is attached to the surface of the rotary drum 53 and can slide up and down along the surface of the rotary drum 53, the positioning rollers 74 are rotatably connected to the edge of the upper end of the positioning plate 73 and are in contact connection with wheels of a vehicle, friction is small, good guidance performance is achieved, the telescopic cylinder 72 is rotatably connected in the rotary drum set rack 4, an extension rod of the telescopic cylinder 72 is rotatably connected with the lower end of the positioning plate 73, and the telescopic cylinders 72 of the two groups of rotary drum devices 71 can drive the respective positioning plate 73 to do circular motion around the corresponding rotary drum 53, so that the wheels of the detected vehicle are ensured to be in contact with the top end of the rotary drum 53 in the detection process, wheel positioning is completed, and the accuracy of detected data is ensured.
Further, referring to fig. 7 and 8, the positioning plate 73 includes an arc plate portion 75 and a positioning connection lug 76, the arc plate portion 75 is arc-shaped, and is concentric with the cross section of the corresponding rotating drum 53, so that the arc plate portion 75 can make circular motion around the corresponding rotating drum 53, the upper end edge of the arc plate portion 75 is rotatably connected with a positioning roller 74, the positioning roller 74 can push the wheel of the vehicle to be measured, which is in contact with the positioning roller 74, under the push of the arc plate portion 75, so that the wheel of the vehicle to be measured is in contact with the square of the rotating drum 53, the positioning connection lug 76 is vertically connected to the lower side edge of the arc plate portion 75, the wheel straightening and positioning device 7 further includes guide seats 77, the guide seats 77 are disposed on both sides of the arc plate portion 75, one side of the guide seats 77 facing the arc plate portion 75 is provided with a guide groove 771, the other side of the guide seats is fixedly connected to the rotating drum set frame 4, the shape of the guide groove 771 is matched with the edge shape of the arc plate portion 75, the guide seat 77 can provide support for the positioning plate 73, so that the guide groove 73 can make circular motion around the rotating drum 53.
The edges of the two sides of the arc plate portion 75 are provided with a plurality of vertical guide bearings 772 and horizontal guide bearings 773, the rotation axes of the vertical guide bearings 772 and the horizontal guide bearings 773 are perpendicular to each other, the vertical guide bearings 772 are in contact connection with the upper surface and the lower surface of the inner side of the guide groove 771, the vertical guide bearings 772 can reduce the friction force between the arc plate portion 75 and the upper surface and the lower surface of the guide groove 771, the upper surface and the lower surface of the arc plate portion 75 are prevented from being in direct contact with the guide groove 771, the horizontal guide bearings 773 are in contact connection with the side surface of the inner side of the guide groove 771, the vertical guide bearings 772 can reduce the friction force between the arc plate portion 75 and the upper side surface and the lower side surface of the guide groove 771, the edge of the arc plate portion 75 is prevented from being in direct contact with the side surface of the inner side of the guide groove 771, the telescopic cylinder 72 can more easily push the positioning plate 73 to slide in the guide groove 771, the friction loss of the positioning plate 73 is reduced, and the service life of the wheel-straightening positioning device 7 is prolonged.
In order to brake the rotating drum 53 in time, referring to fig. 4-6, each of the inner sides of the rotating drum 53 is provided with a set of brake devices 8, each brake device 8 includes a brake pedestal 81, a lifting air bag 82, a lifting frame 83 and a brake shoe 84, the brake pedestal 81 is fixedly connected to the roller set frame 4, the brake shoe 84 is movably connected to the upper surface of the lifting frame 83, preferably, the lower surface of the brake shoe 84 is provided with a movable connecting lug, the brake shoe 84 is rotatably connected to the upper surface of the lifting frame 83 through the movable connecting lug, so that when the brake shoe 84 is contacted and stopped with the inner side surface of the rotating drum 53, the brake shoe 84 forms a soft connection with the lifting frame 83 to buffer the impact force of a part of braking and stopping, the shape of the brake shoe 84 is matched with the inner side shape of the rotating drum 53, so that the brake shoe 84 can be more attached to the inner side of the rotating drum 53, the lifting air bag 82 is arranged between the lifting frame 83 and the brake pedestal 81, the lifting frame 83 is elastically connected with the brake pedestal 81, the lifting air bag 82 is connected with a brake air pump through a pipeline, when the rotary drum 53 needs to be braked, the brake air pump starts to inflate the lifting air bag 82, the volume of the lifting air bag 82 is increased, the lifting height is increased, the brake shoe 84 on the lifting frame 83 is in contact with the inner side surface of the rotary drum 53 through the lifting frame 83, the rotary drum 53 is enabled to gradually stop rotating under the action of friction force with the brake shoe 84, and when a vehicle enters, the brake shoe 84 is controlled to prop against the inner side of the rotary drum 53, the rotary drum 53 is prevented from rolling after being contacted with the wheel, when the wheel of the vehicle entering and exiting equipment to be detected is in the state on the rotary drum 53, the vehicle is ensured to normally pass through, and the detection process is in a loosening state, and enabling the chassis dynamometer to work normally.
Preferably, the lower surface of the lifting frame 83 is provided with a plurality of positioning pins which vertically penetrate through the brake pedestal 81 downwards, the tail end of each positioning pin is provided with a locking nut, a return spring surrounding the positioning pin is arranged between the locking nut and the lower surface of the brake pedestal 81, when the brake device 8 executes once braking action, the return spring can push the positioning pin downwards, so that the brake shoe 84 falls back to the default height, contacts the brake state, avoids the brake shoe 84 and the inner side of the rotary drum 53 from always being in the contact state, generates unnecessary abrasion, and further influences the detection precision of the chassis dynamometer on the vehicle power.
The low-speed rotary drum driving device 9 is arranged in the rotary roller group rack 4, the low-speed rotary drum driving device 9 comprises a driving motor 91, the driving motor 91 is fixedly installed in the rotary roller group rack 4, an output shaft of the driving motor 91 is connected with the rotary roller shaft 51 through a chain, the driving motor 91 can drive the rotary roller shaft 51 to rotate through active driving, the rotary rollers 53 at two ends of the rotary roller shaft 51 are driven to rotate together in a plain mode, the position of a detected vehicle on the chassis dynamometer is finely adjusted, and safety of a detection process is guaranteed.
The speed measuring assembly 10 is further fixedly connected to the roller set rack 4, referring to fig. 3, the speed measuring assembly 10 includes a speed sensor 101, the speed sensor 101 is disposed at one end of the roller shaft 51 and is coaxially connected with the roller shaft 51, the speed measuring assembly 10 can measure an instantaneous speed n (unit is R/s) of the roller shaft 51, where R represents several circles and s represents time unit second, and then the instantaneous speed v of the vehicle to be measured in the simulated driving state can be obtained by matching a formula v =2 pi R n, where pi represents a circumferential rate and R is a radius of the rotating roller 53.
The roller group frame 4 is also provided with a force sensor assembly 11, one end of the force sensor assembly 11 is rotatably connected with the roller group frame 4, and the other end of the force sensor assembly 11 is rotatably connected with a shell of the torque motor 52. When the wheel of vehicle is driving and is rotating cylinder 53 and rotate, whole power detecting element 5 can bear certain anti-power of taking off, and when the power of vehicle was too high, anti-power of taking off was too big, power detecting element 5 probably breaks away from the damage from runner group frame 4, still seriously threatens staff on every side, force sensor subassembly 11's setting can detect anti-power of taking off, if anti-power of taking off is too big, the staff can in time brake and stop by survey vehicle and rotating cylinder 53, avoids power detecting element 5 to break away from the staff around the whole chassis dynamometer harm of damage from runner group frame 4.
Further, a chassis dynamometer machine of single-roller four-wheel drive wheel base adjustable still includes the control unit, adjusting cylinder 61, distance sensor 62, wheel alignment positioner 7, arresting gear 8, torque motor 52, driving motor 91, speed measuring component 10 and force sensor subassembly 11 all are connected with the control unit communication, and the staff can realize through controlling the control unit all dynamometer work of chassis dynamometer machine realizes the detection control of vehicle, convenient and fast more.
Claims (10)
1. The chassis dynamometer with the adjustable single-roller four-wheel drive wheelbase is arranged in a pit (1), and is characterized in that the chassis dynamometer comprises a movable rotary drum group (2) and a fixed rotary drum group (3), the fixed rotary drum group (3) is fixedly connected to the bottom of the pit (1), the movable rotary drum group (2) is arranged on the opposite side of the fixed rotary drum group (3) and is slidably connected to the bottom of the pit (1), a rotary drum group wheelbase adjusting device (6) is arranged between the movable rotary drum group (2) and the fixed rotary drum group (3), the rotary drum group wheelbase adjusting device (6) is also fixed to the bottom of the pit (1), the rotary drum group wheelbase adjusting device (6) is connected with the movable rotary drum group (2), and the rotary drum group wheelbase adjusting device (6) can drag the movable rotary drum group (2) to slide and is used for controlling the distance between the movable rotary drum group (2) and the fixed rotary drum group (3);
the movable rotary drum set (2) and the fixed rotary drum set (3) are both composed of a rotary drum set rack (4) and a power detection unit (5), the power detection unit (5) comprises a rotary drum shaft (51) and a torque motor (52), two ends of the rotary drum shaft (51) are respectively and rotatably connected with a rotary drum (53), and the rotary drum shaft (51) is rotatably connected with a rotor of the torque motor (52);
a low-speed rotary drum driving device (9) is arranged in the rotary roller group rack (4), the low-speed rotary drum driving device (9) comprises a driving motor (91), and an output shaft of the driving motor (91) is connected with a rotary roller shaft (51) through a chain;
each rotating roller (53) is provided with a group of braking devices (8) on the inner side, each braking device (8) comprises a lifting frame (83) and a braking shoe (84), each braking shoe (84) is movably connected to the upper surface of each lifting frame (83) and is in flexible connection with each lifting frame (83), and the shape of each braking shoe (84) is matched with the shape of the inner side of each rotating roller (53).
2. The chassis dynamometer with adjustable single-roller four-wheel-drive wheelbase according to claim 1, characterized in that the rotating roller shaft (51) is transversely and rotatably connected to the rotating roller group rack (4), the rotating rollers (53) are arranged below corresponding wheels, and the rotating rollers (53) are in contact connection with the corresponding wheels.
3. The chassis dynamometer with the adjustable single-roller four-wheel drive wheelbase according to claim 2, wherein a set of wheel alignment positioning devices (7) is arranged around each rotating roller (53), each set of wheel alignment positioning devices (7) comprises two sets of drum devices (71), the two sets of drum devices (71) are bilaterally symmetric around the center of the rotating roller (53), the two sets of drum devices (71) are identical in structure, each drum device (71) comprises a telescopic cylinder (72), a positioning plate (73) and a positioning roller (74), the positioning plate (73) is arranged to be attached to the surface of the rotating roller (53) and can slide up and down along the surface of the rotating roller (53), the positioning roller (74) is rotatably connected to the upper end edge of the positioning plate (73) and is in contact with the wheels of the vehicle, the telescopic cylinder (72) is rotatably connected to the roller set frame (4), an extension rod of the telescopic cylinder (72) is rotatably connected to the lower end of the positioning plate (73), and the telescopic cylinder (72) can drive the positioning plate (73) to slide up and down along the surface of the rotating roller (53).
4. The chassis dynamometer with the adjustable single-roller four-wheel-drive wheelbase according to claim 3, wherein the positioning plate (73) comprises an arc plate portion (75) and a positioning connecting lug (76), the arc plate portion (75) is arc-shaped and concentric with the cross section of the corresponding rotary roller (53), a positioning roller (74) is rotatably connected to the upper end edge of the arc plate portion (75), the positioning connecting lug (76) is vertically connected to the lower side edge of the arc plate portion (75) and rotatably connected with an extension rod of the telescopic cylinder (72), the wheel straightening and positioning device (7) further comprises guide seats (77), the guide seats (77) are arranged on two sides of the arc plate portion (75), a guide groove (771) is formed in one side, facing the arc plate portion (75), of each guide seat (77) is fixedly connected to the rotary roller set rack (4) on the other side, and the shape of each guide groove (771) is matched with the shape of the edge of the arc plate portion (75).
5. The chassis dynamometer with the adjustable one-roller four-wheel-drive wheelbase according to claim 4, wherein a plurality of vertical guide bearings (772) and horizontal guide bearings (773) are arranged on two side edges of the arc plate portion (75), the rotation axes of the vertical guide bearings (772) and the horizontal guide bearings (773) are perpendicular to each other, the vertical guide bearings (772) are in contact connection with the upper surface and the lower surface of the inner side of the guide groove (771), and the horizontal guide bearings (773) are in contact connection with the side surfaces of the inner side of the guide groove (771).
6. The chassis dynamometer machine with the adjustable single-roller four-wheel-drive wheelbase according to claim 2, wherein the braking device (8) further comprises a braking pedestal (81) and a lifting air bag (82), the braking pedestal (81) is fixedly connected to the roller group rack (4), the lifting air bag (82) is arranged between a lifting frame (83) and the braking pedestal (81), the lifting frame (83) is elastically connected with the braking pedestal (81), and the lifting air bag (82) is connected with a braking air pump through a pipeline.
7. The chassis dynamometer with adjustable single-roller four-wheel-drive wheelbase according to claim 2, wherein the driving motor (91) is fixedly installed in the roller group rack (4).
8. The chassis dynamometer with the adjustable single-roller four-wheel drive wheelbase as claimed in claim 2, wherein a speed measurement component (10) is further fixedly connected to the roller group rack (4), the speed measurement component (10) comprises a rotation speed sensor (101), and the rotation speed sensor (101) is arranged at one end of the roller shaft (51) and is coaxially connected with the roller shaft (51).
9. The chassis dynamometer with the adjustable single-roller four-wheel drive wheelbase as claimed in claim 2, wherein a force sensor assembly (11) is further arranged in the roller group rack (4), one end of the force sensor assembly (11) is rotatably connected with the roller group rack (4), and the other end of the force sensor assembly (11) is rotatably connected with a shell of a torque motor (52).
10. The chassis dynamometer with adjustable single-roller four-wheel-drive wheelbase according to claim 1, characterized in that a distance sensor (62) is arranged on one side of the fixed drum set (3) facing the moving drum set (2).
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