CN113125166A - Installation structure and installation method of rotating hub tension and compression sensor of chassis dynamometer - Google Patents
Installation structure and installation method of rotating hub tension and compression sensor of chassis dynamometer Download PDFInfo
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- CN113125166A CN113125166A CN202110196996.8A CN202110196996A CN113125166A CN 113125166 A CN113125166 A CN 113125166A CN 202110196996 A CN202110196996 A CN 202110196996A CN 113125166 A CN113125166 A CN 113125166A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/26—Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload
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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
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/025—Test-benches with rotational drive means and loading means; Load or drive simulation
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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
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/027—Test-benches with force-applying means, e.g. loading of drive shafts along several directions
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Abstract
The invention discloses a mounting structure and a mounting method of a tension and compression sensor of a rotating hub of a chassis dynamometer, wherein the mounting structure comprises a support frame, a transmission shaft and the rotating hub; the transmission shaft is sleeved with a driving assembly, a shell of the driving assembly is connected with the transmission shaft through a first transmission bearing, and a bearing assembly is connected between the shell and the supporting frame; a plurality of mounting plates are axially arranged on the outer circumference of the shell, and a pull seat is arranged on at least one mounting plate; the pull seat is movably connected with a pull rod assembly, the other end of the pull rod assembly is connected with a tension and compression sensor, the tension and compression sensor is arranged on an installation frame, and the installation frame is fixedly arranged on the support frame; the central axis of the tension and compression sensor is perpendicular to the central axis of the transmission shaft; this mounting structure is simple compact, easily preparation and installation, can effectually acquire the atress condition of transmission shaft.
Description
Technical Field
The invention relates to the technical field of dynamometers, in particular to a structure and a method for mounting a tension and compression sensor of a rotating hub of a chassis dynamometer.
Background
The chassis dynamometer is an indoor bench test device for testing the performances of dynamic property, multi-working-condition emission indexes, fuel indexes, pure electric endurance mileage and the like of automobiles and engineering vehicles, the chassis dynamometer simulates a road surface through a roller, calculates a road simulation equation and simulates with a loading device, so that the accurate simulation of each working condition of the automobiles and the engineering vehicles is realized, and the chassis dynamometer can be used for loading debugging of the automobiles and the engineering vehicles and diagnosing faults of the vehicles under a load condition; the chassis dynamometer has the advantages of convenient use and reliable performance, and is not influenced by external conditions. On the premise of not disassembling the automobile, the service performance of each system and component of the automobile can be accurately and quickly detected. The chassis dynamometer can be used for both automobile scientific experiments and maintenance detection.
As disclosed in the chinese utility model patent (publication No. CN208568127U) in 2019, a permanent magnet synchronous motor driven chassis dynamometer includes a base, a spindle, an encoder, a torque measurer and a rotor hub, the spindle is fixedly mounted on the base through a bearing; the rotating hub is fixed on the main shaft, the main shaft provides resistance by a permanent magnet synchronous motor, and the permanent magnet synchronous motor comprises a rotating shaft, a shell, a stator assembly and a rotor assembly; the stator assembly is fixedly arranged on the shell and provides a rotating resistance magnetic field for the rotor assembly; the rotor assembly with permanent magnetic property is fixedly arranged on the rotating shaft and corresponds to the stator assembly; the torque measurer is arranged between the main shaft and the rotating shaft and used for measuring the rotating torque between the shafts; the encoder is used for measuring the rotating speed and the rotating angle of the rotating shaft. The dynamometer can be used for dynamometer tests of vehicles in multiple environments, but the axial size is large, the occupied axial space is large, particularly, in order to obtain the torque of a transmission shaft, a torque measurer is arranged between two shafts, the axial size is greatly increased, and the dynamometer tests of multiple wheels of a large truck can occupy a very large underground space.
Disclosure of Invention
The invention aims to provide a mounting structure and a mounting method of a rotary hub tension-compression sensor of a chassis dynamometer, aiming at the problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a mounting structure of a rotary hub tension and compression sensor of a chassis dynamometer comprises a supporting frame, wherein a transmission shaft is arranged on the supporting frame, and one end of the transmission shaft extends out of the supporting frame and is connected with a rotary hub; a driving assembly is sleeved at a position, above the supporting frame, of the transmission shaft, a shell of the driving assembly is connected with the transmission shaft through a first transmission bearing, and a bearing assembly is connected between the shell and the supporting frame; a plurality of mounting plates are axially arranged on the outer circumference of the shell, and a pull seat is arranged on at least one mounting plate; the pull seat is movably connected with a pull rod assembly, the other end of the pull rod assembly is connected with a tension and compression sensor, the tension and compression sensor is arranged on an installation frame, and the installation frame is fixedly arranged on the support frame; and the central axis of the tension and compression sensor is perpendicular to the central axis of the transmission shaft.
This draw and press sensor mounting structure sets up ingeniously, the rational utilization the support frame the transmission shaft with mounted position relation between the drive assembly, compact will draw and press the sensor setting to be close to near drive assembly has reduced the space and has taken up, need not set up complicated connection structure, also need not extra extension the length of transmission shaft is in order to connect draw and press the sensor, can not be right the motion of transmission shaft produces the interference the transmission shaft with drive assembly normal operating's in-process, the relevant operation of dynamometer test all can be accomplished.
Generally, the arrangement of a rotating hub, a transmission shaft, a motor and the like of the chassis dynamometer occupies a larger space, and the chassis dynamometer in the application adopts a compact design, so that the axial size and the circumferential size are reduced as much as possible; this draw pressure sensor mounting structure is fine adaptation this kind of compact design.
In addition, the tension and compression sensor is not directly connected with and acts on the transmission shaft, but is connected with the shell through the pull rod assembly and the pull seat so as to indirectly obtain tension and compression acting force of the transmission shaft, and data such as power, torque and the like are obtained through conversion; the transmission shaft and the driving assembly are connected together, the transmission shaft and the driving assembly are not in direct contact with the support frame (and the mounting seat), the bearing assembly is connected with the support frame, the driving assembly and the transmission shaft can rotate freely, but because the base, the pull rod assembly, the pull pressure sensor and the mounting frame are arranged, when the transmission shaft rotates, the base and the pull rod assembly can pull and fix the casing, so that the casing overcomes the defect that the casing follows the rotation of the transmission shaft to obtain the torque of the casing, and the torque of the transmission shaft is obtained through the conversion of the relation between acting force and reacting force. That is to say the drive assembly cover is established on the transmission shaft, accomplish whole the installation of transmission shaft and commentaries on classics hub through the bearing assembly that sets up on the drive assembly.
Further, the pull seat comprises a first vertical connecting plate, the first vertical connecting plate is in threaded connection with the mounting plate, one surface, away from the mounting plate, of the first vertical connecting plate is provided with a pair of second vertical connecting plates which are arranged in parallel, the pair of second vertical connecting plates are perpendicular to the first vertical connecting plate and form a vertical opening, and the pair of second vertical connecting plates are connected with the pull rod assembly through a pin shaft; the pin shaft horizontally penetrates through the pair of second vertical connecting plates and is respectively provided with a pin shaft end cover at the end part, and a locking bolt is externally screwed on the pin shaft end cover.
The pull seat adopting the structure is simple in structure and easy to manufacture, can be horizontally arranged on the outer circumference of the shell, and transmits the pulling pressure on the shell to the pull rod assembly which is vertically arranged; the pull seat can ensure the connection stability and reduce the loss and distortion of stress so as to ensure the accuracy of measurement; the purpose of the pull seat is to transmit horizontal (radial) force to the pull-press sensor which is vertically arranged; the vertical opening is convenient for the installation of the pull rod assembly, and the pin shaft, the pin shaft end cover and the locking bolt are arranged, so that the mounting and dismounting are convenient, and a stable fastening structure can be formed. The first vertical connecting plate may have a maximum dimension of no more than 360 mm.
Furthermore, a reinforcing plate is connected between the pair of second vertical connecting plates in a staggered manner and at the end part of the pull rod assembly, and the reinforcing plate is also connected with the first vertical connecting plate; an inclined rib plate is arranged between the outer side of at least one second vertical connecting plate and the first vertical connecting plate. The reinforcing plate and the inclined rib plate can enhance the connection strength and improve the stability.
Furthermore, the pull rod assembly comprises a pull rod nut, one end of the pull rod nut is provided with a first horizontal through hole, and the first horizontal through hole is used for being connected with the pull seat; the other end of the pull rod nut is provided with a vertical screw hole, the vertical screw hole is connected with a double-headed screw, and the other end of the double-headed screw is connected with the tension and compression sensor; the both ends of double-end screw rod are equipped with lock nut respectively, lock nut with between the pull rod nut or with draw and be equipped with spring washer and plain washer between the pressure sensor in proper order.
The pull rod nut plays a role in carrying transition, stress of the pull seat is transmitted to the double-threaded screw, the pull rod nut can move relative to the pull seat when not fastened, when the positions of the pull seat and the machine shell are adjusted, namely the pull seat is positioned at an angle of 180 degrees horizontally on the machine shell, and the pull rod nut basically cannot move relative to the pull seat after the pull rod nut is fastened; the pull rod nut is a steel structural part made of 40Cr materials, so that better stress performance can be realized, and the overall length of the pull rod assembly can be within 500mm (for a power measuring platform with the length exceeding ten meters relative to a rotating hub with the diameter of several meters).
The setting of double-end screw can be vertical spiro union simultaneously connect draw-bar nut with draw the pressure sensor, lock nut plays the fastening effect, spring washer with the fine setting of flat packing ring is convenient for to keep the symmetry at both ends.
Furthermore, the pull rod nut is strip-shaped, and the end part of the pull rod nut, which is provided with the first horizontal through hole, is of a semicircular structure, so that the pull rod nut can move conveniently at a vertical opening in the pull seat; the axis of the first horizontal through hole is parallel to the axis of the semicircular structure and is respectively perpendicular to the axis of the vertical screw hole, and the vertical screw hole is arranged in the middle of the semicircular structure, so that the stress is more balanced; the middle size of double-end screw is greater than the size at both ends and is equipped with a plurality of rectangle planes on the outer circumference in middle part, the use tool centre gripping of being convenient for double-end screw installs, draw the axis that presses the sensor with double-end screw's the coaxial setting of axis.
Further, the mounting bracket sets up the side of support frame, the mounting bracket includes the horizontal mounting board and sets up a pair of inclined support board of horizontal mounting board below, the horizontal mounting board with inclined support board all welds on the lateral wall of support frame. After the tension and compression sensor is fixed, the tension and compression sensor can acquire the stress of the whole machine shell and the driving assembly of the machine shell.
Furthermore, the supporting frame is of a plate frame structure and comprises a base plate, a pair of parallel side plates are arranged on two sides of the base plate, the side plates are multi-stage ladder-shaped plates, the mounting frame is mounted on the outer sides of the side plates, the size of the upper parts of the side plates is smaller than that of the lower parts of the side plates, the side plates in the shape can increase the supporting area of the lower part, reduce the occupied space of the upper part, enable the connection of the parts above to be more compact, enable the center to fall in the plane where the center line of the base plate is located, and have better stability; the side plate structure comprises a side plate and is characterized in that a plurality of arc supporting plates are arranged between the side plate, mounting seats are arranged on the arc supporting plates and are of semicircular groove structures, the two axial ends of each mounting seat are connected and mounted with a shell of the driving assembly through bearing assemblies respectively, and the two sides of the outer circumference of each mounting seat, which are close to the side plate, are both arranged to be of planar structures and are abutted to the inner sides of the side plates tightly. The outer circumference of the mounting seat is provided with a groove at the step part close to the side plate, and the groove can be used for connecting and mounting the pull seat
The outer arc-shaped supporting plate is just flush with the outer end face of the mounting seat, the middle part of the mounting seat supported by the inner arc-shaped supporting plate is just close to the end part of the rotating hub, and the rotation of the rotating hub can not be influenced by the support; and the inner side and the outer side are provided with inclined rib plates to improve the connection strength.
Further, the driving assembly is a permanent magnet synchronous motor, the permanent magnet synchronous motor comprises a rotor assembly and a stator assembly, the rotor assembly is sleeved and fixed on the transmission shaft, and the stator assembly is arranged and installed inside the casing; the casing comprises an annular casing and casing end covers in threaded connection with two ends of the annular casing, an axial flange structure is arranged in the middle of each casing end cover, each flange structure is provided with a stepped inner hole and a stepped outer peripheral surface, each flange structure is sleeved and abutted on the corresponding transmission shaft, the first transmission bearing is arranged between each stepped inner hole and the corresponding transmission shaft, and the bearing assembly is sleeved on each stepped outer peripheral surface; and a circle of annular groove is formed in the outer circumference of the annular shell, and the annular groove is clamped and screwed with the mounting plate at an interval of 90 degrees.
The permanent magnet synchronous motor is adopted for driving, so that a large-torque output environment can be provided, meanwhile, the response speed is high, the rotating speed is easy to control, the structure is compact, and the permanent magnet synchronous motor can be directly arranged on the transmission shaft to drive the transmission shaft to rotate so as to drive the rotating hub to rotate; that is to say, the rotor assembly is installed on the transmission shaft, and the stator assembly is installed on the casing, and through the relationship between the acting force and the reacting force, the force of the casing against the rotation is substantially the same as the force of the transmission shaft against the rotation, so that the tension and compression sensor is fixed and connected with the casing to indirectly acquire the stress or torque of the transmission shaft.
Further, the bearing assembly comprises a main bearing sleeved on the casing, the main bearing is installed on an installation seat on the supporting frame, bearing end covers are respectively arranged on the inner side and the outer side of the installation seat, a bearing pressing plate is further connected between the bearing end covers in a threaded manner, the bearing pressing plate is arched, and two ends of the bearing pressing plate are respectively connected to the installation seat in a threaded manner; the bearing assemblies are provided as a pair. The bearing pressing plate is arranged to fix the bearing end cover and the main bearing on the mounting seat, so that axial and circumferential shaking of the bearing end cover and the main bearing is reduced, and the bearing pressing plate is convenient to mount and dismount.
Further, the mounting method of the mounting structure of the tension and compression sensor of the rotating hub of the chassis dynamometer comprises the steps of mounting a driving assembly on a transmission shaft connected with the rotating hub, wherein the transmission shaft and the driving assembly are mounted on a mounting seat together through a bearing assembly, and the mounting seat is arranged on a supporting frame; the lateral wall of support frame passes through the mounting bracket installation and draws pressure sensor and makes the axis that draws pressure sensor is perpendicular to the axis of transmission shaft, draw and press the last vertical pull rod subassembly that is connected with of sensor, pull rod subassembly is through drawing the seat to connect and fix drive assembly's casing.
Compared with the prior art, the invention has the beneficial effects that: 1. the tension and compression sensor mounting structure is ingenious in arrangement, reasonable and compact in structure, space occupation is reduced, a complex connecting structure is not needed, the length of the transmission shaft is not needed to be lengthened additionally, movement interference is less, and the test is simple and high in accuracy; 2. the tension and compression sensor is not directly connected with and acts on the transmission shaft, but is connected with the shell through the pull rod assembly and the pull seat so as to indirectly acquire tension and compression acting force of the transmission shaft, and data such as power, torque and the like are obtained through conversion, so that the aim of simplifying the whole structure is fulfilled; 3. the pull seat with the structure is simple in structure and easy to manufacture, can be horizontally arranged on the outer circumference of the shell, and transmits the pulling pressure borne by the shell to the vertically arranged pull rod assembly, the double-headed screw rod can be vertically connected with the pull rod nut and the pulling pressure sensor in a screwed mode at the same time, and the pull rod nut plays a role in bearing transition and transmits the stress of the pull seat to the double-headed screw rod; 4. the permanent magnet synchronous motor is adopted for driving, the output environment of large torque can be provided, meanwhile, the response speed is high, the rotating speed is easy to control, the structure is compact, the rotor assembly is installed on the transmission shaft, the stator assembly is installed on the shell, and the tension and compression sensor is fixed and connected with the shell to indirectly acquire the stress or the torque of the transmission shaft through the relation between acting force and reacting force.
Drawings
FIG. 1 is a general schematic view of a mounting structure of a rotary hub tension-compression sensor of a chassis dynamometer according to the present invention;
FIG. 2 is a schematic perspective view of a pull seat and a pull rod assembly of the installation structure of a rotating hub pull-press sensor of a chassis dynamometer according to the present invention;
FIG. 3 is a schematic view of a partial cross-sectional view of a pull seat and a pull rod assembly of a mounting structure of a rotating hub pull-press sensor of a chassis dynamometer according to the present invention;
FIG. 4 is a schematic structural diagram of a tie rod nut of the installation structure of a tension and compression sensor of a rotating hub of a chassis dynamometer;
FIG. 5 is a schematic view of a partial cross-section of a mounting structure of a tension and compression sensor of a rotating hub of a chassis dynamometer according to the present invention;
FIG. 6 is a schematic diagram of a half-section three-dimensional structure of a mounting structure of a tension-compression sensor of a rotating hub of a chassis dynamometer, according to the present invention;
FIG. 7 is a first schematic structural diagram of a housing end cover of a mounting structure of a tension and compression sensor of a rotating hub of a chassis dynamometer according to the present invention;
FIG. 8 is a second schematic structural view of a case end cover of the mounting structure of a tension and compression sensor of a rotating hub of a chassis dynamometer according to the present invention;
FIG. 9 is a schematic view of the overall mounting of the chassis dynamometer of the present invention;
in the figure: 1. a support frame; 101. a substrate; 102. a side plate; 103. an arc-shaped support plate; 2. a drive shaft; 3. rotating the hub; 4. a housing; 401. an annular housing; 402. a housing end cap; 403. mounting a plate; 5. a bearing assembly; 501. a main bearing; 502. a bearing end cap; 503. a bearing pressure plate; 6. pulling a base; 601. a first vertical connecting plate; 602. a second vertical connecting plate; 603. a pin shaft; 604. a pin shaft end cover; 605. locking the bolt; 606. a reinforcing plate; 607. an inclined rib plate; 7. a drawbar assembly; 701. a draw rod nut; 7011. a first horizontal through hole; 7012. a vertical screw hole; 702. a double-ended screw; 703. locking the nut; 704. a spring washer; 705. a flat washer; 706. a rectangular plane; 8. a tension and compression sensor; 9. a mounting frame; 10. a mounting seat; 11. a first drive bearing; 12. a flange structure; 1201. a stepped inner bore; 1202. a stepped outer peripheral surface.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, a mounting structure of a rotating hub tension and compression sensor of a chassis dynamometer comprises a support frame 1, wherein a transmission shaft 2 is arranged on the support frame 1, and one end of the transmission shaft 2 extends out of the support frame 1 and is connected with a rotating hub 3; a driving assembly is sleeved at a position, above the support frame 1, of the transmission shaft 2, a shell 4 of the driving assembly is connected with the transmission shaft 2 through a first transmission bearing, and a bearing assembly 5 is connected between the shell 4 and the support frame 1; a plurality of mounting plates 403 are axially arranged on the outer circumference of the casing 4, wherein a pull seat 6 is mounted on one mounting plate 403; the pull seat 6 is movably connected with a pull rod assembly 7, the other end of the pull rod assembly 7 is connected with a tension and compression sensor 8, the tension and compression sensor 8 is arranged on an installation frame 9, and the installation frame 9 is fixedly arranged on the support frame 1; and the central axis of the tension and compression sensor 8 is perpendicular to the central axis of the transmission shaft 2.
This draw and press sensor mounting structure sets up ingeniously, rational utilization support frame 1 the transmission shaft 2 with mounted position relation between the drive assembly, compact will draw and press sensor 8 to set up near drive assembly has reduced the space and has occupied, need not set up complicated connection structure, also need not extra extension the length of transmission shaft is in order to connect draw and press the sensor, can not be right the motion of transmission shaft produces the interference the transmission shaft with drive assembly normal operating's in-process all can accomplish the relevant operation of dynamometer test.
The tension and compression sensor 8 is not directly connected with and acts on the transmission shaft 2, but is connected with the machine shell 4 through the pull rod assembly 7 and the pull seat 6 so as to indirectly obtain tension and compression acting force of the transmission shaft 2, data such as power, torque and the like are obtained through conversion, and the diameter of the machine shell 4, the horizontal distance between the pull seat 6 and the transmission shaft 2 and the length of the pull rod assembly are determined; specifically, the transmission shaft 2 and the driving assembly are connected together, the transmission shaft 2 and the driving assembly do not directly contact with the support frame 1 (and the mounting base 10), they are connected with the support frame 1 (and the mounting base 10) through the bearing assembly 5, the driving assembly and the transmission shaft 2 can rotate freely, but due to the arrangement of the pull seat 6 and the pull rod assembly 7, the pull pressure sensor 8 and the mounting frame 9, when the transmission shaft 2 rotates, the pull seat 6 and the pull rod assembly 7 can pull and fix the casing 4, so that the torque of the casing 4 is obtained by overcoming the rotation of the following transmission shaft 2 from the casing 4, and the torque of the transmission shaft 2 is obtained by converting the relation between the acting force and the reaction force. That is to say, the driving component is sleeved on the transmission shaft 2, and the whole transmission shaft and the rotating hub are installed through the bearing component arranged on the driving component.
Further, as shown in fig. 2 and 3, the pull seat 6 includes a first vertical connecting plate 601, the first vertical connecting plate 601 is screwed on the mounting plate 403, a pair of second vertical connecting plates 602 arranged in parallel is disposed on a surface of the first vertical connecting plate 601 away from the mounting plate 403, the pair of second vertical connecting plates 602 is perpendicular to the first vertical connecting plate 601 and forms a vertical opening, and the pair of second vertical connecting plates 602 is connected to the pull rod assembly 7 through a pin 603; the pin 603 horizontally penetrates through the pair of second vertical connecting plates 602, pin end covers 604 are respectively arranged at the end parts of the pin 603, and locking bolts 605 are externally screwed on the pin end covers 604.
The pull seat adopting the structure has simple structure and easy manufacture, can be horizontally arranged on the outer circumference of the shell 4, and transmits the pulling pressure on the shell 4 to the pull rod assembly 7 which is vertically arranged; the pull seat 6 can ensure the connection stability and reduce the loss and distortion of stress so as to ensure the accuracy of measurement; the purpose of the pull seat 6 is to transmit horizontal (radial) force to the pull-press sensor 8 which is vertically arranged; the installation of the pull rod assembly 7 is facilitated due to the arrangement of the vertical opening, and the pin shaft 603, the pin shaft end cover 604 and the locking bolt 605 are arranged, so that the mounting and dismounting are convenient, and a stable fastening structure can be formed. The maximum length dimension of the first vertical connecting plate 601 is 360 mm.
Further, a reinforcing plate 606 is connected between the pair of second vertical connecting plates 602 at the end part staggered with the pull rod assembly 7, and the reinforcing plate 606 is also connected with the first vertical connecting plate 601; an inclined rib plate 607 is arranged between the outer side of at least one second vertical connecting plate 602 and the first vertical connecting plate 601. The reinforcing plate 606 and the inclined rib plate 607 can enhance the connection strength and improve the stability.
Further, as shown in fig. 4, the pull rod assembly 7 includes a pull rod nut 701, one end of the pull rod nut 701 is provided with a first horizontal through hole 7011, and the first horizontal through hole 7011 is used for connecting with the pin 603; the other end of the pull rod nut 701 is provided with a vertical screw hole 7012, the vertical screw hole 7012 is connected with a double-threaded screw 702, and the other end of the double-threaded screw 702 is connected with the tension and compression sensor 8; two ends of the double-end screw 702 are respectively sleeved with a locking nut 703, and a spring washer 704 and a flat washer 705 are sequentially arranged between the locking nut 703 and the pull rod nut 701 and between the pull pressure sensor 8.
The pull rod nut 701 plays a role in carrying transition, stress of the pull seat 6 is transmitted to the double-threaded screw 702, the pull rod nut 701 can move relative to the pull seat 6 when not fastened, when the positions of the pull seat 6 and the machine shell 4 are adjusted, namely the pull seat 6 is positioned at an angle of 180 degrees of the horizontal position of the machine shell 4, and at the moment, after the pull rod nut 701 is fastened, the pull rod nut 701 basically cannot move relative to the pull seat 6; the pull rod nut 701 is a steel structural member made of 40Cr materials, so that better stress performance can be achieved, and the overall length of the pull rod assembly 7 can be within 500mm (for a dynamometer platform with the length exceeding ten meters relative to a rotating hub with the diameter of several meters).
The double-threaded screw 702 can be vertically screwed with the pull rod nut 701 and the tension and compression sensor 8 at the same time, the locking nut 703 plays a fastening role, and the spring washer 704 and the flat washer 705 are arranged to facilitate fine adjustment so as to keep the two ends symmetrical.
Furthermore, the pull rod nut 701 is strip-shaped, and the end part of the pull rod nut 701, which is provided with the first horizontal through hole 7011, is of a semicircular structure, so that the pull rod nut can move conveniently at a vertical opening in the pull seat 6; the axis of the first horizontal through hole 7011 is coincident with the axis of the semicircular structure and is respectively perpendicular to the axis of the vertical screw hole 7012, and the vertical screw hole 7012 is arranged in the middle of the semicircular structure, so that stress is more balanced; the middle size of double-end screw 702 is greater than the size at both ends and is equipped with a plurality of rectangle planes 706 on the outer circumference in middle part, is convenient for use instrument centre gripping double-end screw 702 carries out the wrench movement and adjusts, draw pressure sensor 8's axis with double-end screw 702's coaxial setting of axis.
Further, mounting bracket 9 sets up the side of support frame 1, mounting bracket 9 includes the horizontal installation board and sets up a pair of inclined support board of horizontal installation board below, the horizontal installation board with inclined support board all welds on the lateral wall of support frame 1. After the tension and compression sensor 8 is fixed, the tension and compression sensor 8 can acquire the stress of the whole machine shell and the driving component thereof.
Further, as shown in fig. 6 and 7, the supporting frame 1 is a plate frame structure, and includes a base plate 101, a pair of parallel side plates 102 are disposed on two sides of the base plate 101, the side plates 102 are multi-stage ladder-shaped plates, the mounting frame 9 is mounted on an outer side of one of the side plates 102, an upper dimension of the side plate 102 is smaller than a lower dimension of the side plate 102, and by using the side plate with such a shape, a supporting area below can be increased, an occupied space above can be reduced, connection of components above can be more compact, a center of the side plate falls in a plane where a centerline of the base plate 101 is located, and stability is better; a plurality of arc-shaped supporting plates 103 are arranged between the pair of side plates 102, mounting seats 10 are arranged on the arc-shaped supporting plates 103, the mounting seats 10 are in semicircular groove-shaped structures, two axial ends of each mounting seat 10 are respectively connected with a shell 4 for mounting the driving assembly through the bearing assembly 5, and two sides of the outer circumference of each mounting seat 10, which are close to the side plates 102, are both provided with plane structures and are tightly abutted to the inner sides of the side plates 102. The outer circumference of the mounting seat 10 is provided with a groove at the step part close to the side plate 102, and the groove can be used for connecting and mounting the pulling seat
The outer arc-shaped support plate 103 is just flush with the outer end face of the mounting seat 10, the middle part of the mounting seat 10 supported by the inner arc-shaped support plate 103 is just close to the end part of the rotating hub 3, and the rotation of the rotating hub 3 can not be influenced by the support; and the inner side and the outer side are provided with inclined rib plates to improve the connection strength.
Further, as shown in fig. 7 and 8, the driving assembly is a permanent magnet synchronous motor, the permanent magnet synchronous motor includes a rotor assembly and a stator assembly, the rotor assembly is sleeved and fixed on the transmission shaft 2, and the stator assembly is arranged and installed inside the casing 4; the casing 4 comprises an annular casing 401 and casing end covers 402 screwed at two ends of the annular casing 401, an axial flange structure 12 is arranged in the middle of each casing end cover 402, each flange structure 12 is provided with a stepped inner hole 1201 and a stepped outer peripheral surface 1202, the flange structures 12 are sleeved and abutted on the transmission shaft 2, the first transmission bearing 11 is arranged between the stepped inner hole 1201 and the transmission shaft 2, and the bearing assembly 5 is sleeved on the stepped outer peripheral surface 1202; a ring of annular grooves are formed in the outer circumference of the annular shell 401, and the mounting plate 403 is clamped and screwed in the annular grooves at intervals of 90 degrees.
The permanent magnet synchronous motor is adopted for driving, so that a large-torque output environment can be provided, meanwhile, the response speed is high, the rotating speed is easy to control, the structure is compact, and the permanent magnet synchronous motor can be directly arranged on the transmission shaft 2 to drive the transmission shaft 2 to rotate so as to drive the rotating hub 3 to rotate; that is, the rotor assembly is installed on the transmission shaft 2, and the stator assembly is installed on the casing 4, and through the relationship between the acting force and the reacting force, the force of the casing against rotation is substantially the same as the force of the transmission shaft against rotation, so that the tension and compression sensor is fixed and connected with the casing to indirectly acquire the stress or torque of the transmission shaft.
Further, the bearing assembly 5 includes a main bearing 501 sleeved on the casing end cover 402, the main bearing 501 is installed on the installation seat 10 on the support frame 1, and bearing end covers 502 are respectively arranged on the inner side and the outer side of the installation seat, a bearing pressing plate 503 is further screwed between a pair of the bearing end covers 502, the bearing pressing plate 503 is arc-shaped, and two ends of the bearing pressing plate 503 are respectively screwed on the installation seat 10; the bearing assemblies are provided as a pair. The bearing pressure plate 503 is arranged to fix the bearing end cover 502 and the main bearing 501 on the mounting seat 10, so as to reduce the axial and circumferential shake thereof, and facilitate mounting and dismounting.
Example two:
the embodiment provides an installation method of a mounting structure of a tension and compression sensor of a rotating hub of a chassis dynamometer, which comprises the steps of installing a driving assembly on a transmission shaft 2 connected with the rotating hub 3, installing the transmission shaft 2 and the driving assembly on an installation seat 10 together through a bearing assembly 5, and arranging the installation seat 10 on a support frame 1; the lateral wall of support frame 1 passes through mounting bracket 9 installation and draws pressure sensor 8 and makes the axis that draws pressure sensor 8 is perpendicular to the axis of transmission shaft 2, draw and press the vertical pull rod subassembly 7 that is connected with on the sensor 8, pull rod subassembly 7 is connected and is fixed through drawing seat 6 drive assembly's casing 4.
The installation method is simple and effective, the compact design of the structure of the rotary hub and the transmission shaft of the whole dynamometer can be maintained, the installation process can be synchronously carried out in the installation process of the rotary hub, and the tension and compression sensors arranged on the side edges are easy to maintain and connect circuits.
Example three:
this example provides a state of use of the chassis dynamometer in an example embodiment.
As shown in fig. 9, two groups of four rotating hubs 3 are arranged in parallel in a dynamometer platform, the dynamometer platform is arranged in a pit, the upper surface of the dynamometer platform is flush with the ground, and the rotating hubs 3 only expose a part of circular arc above the ground for a vehicle to run on the rotating hubs 3 for performing a dynamometer test; the tension and compression sensors are all located in the underground part, in the test process, people do not need to frequently go down a pit, and the detection data obtained by the tension and compression sensors can be directly obtained through an upper computer.
Generally, the arrangement of a rotating hub, a transmission shaft, a motor and the like of the chassis dynamometer occupies a larger space, but the chassis dynamometer in the application adopts a compact design, so that the axial size and the circumferential size are reduced as much as possible, and the volume of a pit is reduced as much as possible when a vehicle test can be carried out; the mounting structure of the tension and compression sensor is well adapted to the compact design, and the length of the transmission shaft cannot be additionally increased.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A mounting structure of a pull-press sensor of a rotating hub of a chassis dynamometer is characterized by comprising a support frame, wherein a transmission shaft is arranged on the support frame, and one end of the transmission shaft extends out of the support frame and is connected with the rotating hub; a driving assembly is sleeved at a position, above the supporting frame, of the transmission shaft, a shell of the driving assembly is connected with the transmission shaft through a first transmission bearing, and a bearing assembly is connected between the shell and the supporting frame; a plurality of mounting plates are axially arranged on the outer circumference of the shell, and a pull seat is arranged on at least one mounting plate; the pull seat is movably connected with a pull rod assembly, the other end of the pull rod assembly is connected with a tension and compression sensor, the tension and compression sensor is arranged on an installation frame, and the installation frame is fixedly arranged on the support frame; and the central axis of the tension and compression sensor is perpendicular to the central axis of the transmission shaft.
2. The chassis dynamometer rotating hub tension-compression sensor mounting structure of claim 1, wherein the tension seat comprises a first vertical connecting plate, the first vertical connecting plate is in threaded connection with the mounting plate, one side of the first vertical connecting plate, which is far away from the mounting plate, is provided with a pair of second vertical connecting plates which are arranged in parallel, the pair of second vertical connecting plates are arranged perpendicular to the first vertical connecting plate and form a vertical opening, and the pair of second vertical connecting plates are connected with the pull rod assembly through a pin shaft; the pin shaft horizontally penetrates through the pair of second vertical connecting plates and is respectively provided with a pin shaft end cover at the end part, and a locking bolt is externally screwed on the pin shaft end cover.
3. The chassis dynamometer rotating hub tension and compression sensor mounting structure of claim 2, wherein a stiffener plate is connected between a pair of the second vertical connection plates at an end offset from the drawbar assembly, the stiffener plate also being connected to the first vertical connection plate; an inclined rib plate is arranged between the outer side of at least one second vertical connecting plate and the first vertical connecting plate.
4. The chassis dynamometer rotating hub tension-compression sensor mounting structure of claim 1, wherein the tie rod assembly includes a tie rod nut, one end of the tie rod nut is provided with a first horizontal through hole, and the first horizontal through hole is used for connecting with the pull seat; the other end of the pull rod nut is provided with a vertical screw hole, the vertical screw hole is connected with a double-headed screw, and the other end of the double-headed screw is connected with the tension and compression sensor; the both ends of double-end screw rod are equipped with lock nut respectively, lock nut with between the pull rod nut or with draw and be equipped with spring washer and plain washer between the pressure sensor in proper order.
5. The chassis dynamometer rotating hub tension-compression sensor mounting structure of claim 4, wherein the tie nut is elongated, and the end of the tie nut having the first horizontal through hole is semi-circular; the axis of the first horizontal through hole is parallel to the axis of the semicircular structure and is respectively perpendicular to the axis of the vertical screw hole, and the vertical screw hole is arranged in the middle; the middle size of the double-end screw is larger than the sizes of the two ends, the outer circumference of the middle is provided with a plurality of rectangular planes, and the central axis of the tension and compression sensor and the central axis of the double-end screw are coaxially arranged.
6. The chassis dynamometer rotating hub tension and compression sensor mounting structure of claim 1, wherein the mounting bracket is disposed at a side of the support frame, the mounting bracket includes a horizontal mounting plate and a pair of inclined support plates disposed below the horizontal mounting plate, and the horizontal mounting plate and the inclined support plates are both welded to a side wall of the support frame.
7. The chassis dynamometer rotating hub tension-compression sensor mounting structure of claim 1, wherein the supporting frame is a plate frame structure and comprises a base plate, a pair of parallel side plates are arranged on two sides of the base plate, the side plates are multi-stage step ladder-shaped plates, and the mounting frame is mounted on the outer sides of the side plates; the side plate structure comprises a side plate and is characterized in that a plurality of arc supporting plates are arranged between the side plate, mounting seats are arranged on the arc supporting plates and are of semicircular groove structures, the two axial ends of each mounting seat are connected and mounted with a shell of the driving assembly through bearing assemblies respectively, and the two sides of the outer circumference of each mounting seat, which are close to the side plate, are both arranged to be of planar structures and are abutted to the inner sides of the side plates tightly.
8. The chassis dynamometer rotating hub tension-compression sensor mounting structure of claim 1, wherein the driving assembly is a permanent magnet synchronous motor, the permanent magnet synchronous motor includes a rotor assembly and a stator assembly, the rotor assembly is sleeved and fixed on the transmission shaft, and the stator assembly is arranged and mounted inside the casing; the casing comprises an annular casing and casing end covers in threaded connection with two ends of the annular casing, an axial flange structure is arranged in the middle of each casing end cover, each flange structure is provided with a stepped inner hole and a stepped outer peripheral surface, each flange structure is sleeved and abutted on the corresponding transmission shaft, the first transmission bearing is arranged between each stepped inner hole and the corresponding transmission shaft, and the bearing assembly is sleeved on each stepped outer peripheral surface; and a circle of annular groove is formed in the outer circumference of the annular shell, and the annular groove is clamped and screwed with the mounting plate at an interval of 90 degrees.
9. The structure for mounting a rotating hub tension and compression sensor of a chassis dynamometer according to claim 1 or 8, wherein the bearing assembly includes a main bearing sleeved on the casing, the main bearing is mounted on a mounting seat on the supporting frame and is provided with bearing end covers respectively at the inner side and the outer side, a bearing pressure plate is further screwed between the bearing end covers, the bearing pressure plate is arc-shaped, and both ends of the bearing pressure plate are respectively screwed on the mounting seat; the bearing assemblies are provided as a pair.
10. A method for mounting a mounting structure of a rotating hub tension and compression sensor of a chassis dynamometer according to claim 1, wherein the mounting method includes mounting a driving component on a driving shaft connected with the rotating hub, the driving shaft and the driving component are mounted on a mounting seat together through a bearing assembly, and the mounting seat is arranged on a supporting frame; the lateral wall of support frame passes through the mounting bracket installation and draws pressure sensor and makes the axis that draws pressure sensor is perpendicular to the axis of transmission shaft, draw and press the last vertical pull rod subassembly that is connected with of sensor, pull rod subassembly is through drawing the seat to connect and fix drive assembly's casing.
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| CN202110196996.8A CN113125166B (en) | 2021-02-22 | 2021-02-22 | Mounting structure and mounting method of chassis dynamometer rotating hub tension-compression sensor |
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| CN202110196996.8A CN113125166B (en) | 2021-02-22 | 2021-02-22 | Mounting structure and mounting method of chassis dynamometer rotating hub tension-compression sensor |
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| CN113125166B (en) | 2023-04-28 |
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