CN106885665B - Comprehensive test bed for leaf spring suspension system - Google Patents

Abstract

The invention specifically relates to a comprehensive test bench for a leaf spring suspension system with diversified measurement functions and easy operation. The test bench includes the tested part system, clamping system, torque loading and measuring system, rotation angle measuring system, rear axle locking system, AC motor protection system, torque loading and measuring system, vertical loading system, and vertical displacement measuring system . The test bench can accurately measure the longitudinal angle steel degree and radial stiffness of the leaf spring suspension system, and can also perform dynamic tests on the leaf spring suspension system, and can also be used as a test bench for the matching of the leaf spring suspension system and the axle. , It is also possible to connect the leaf spring suspension system with the axle to conduct the torsional rigidity test of the axle housing; this test bench can carry out multiple tests separately, and the operation steps of each test are easy to operate and have strong practicability.

Description

A Comprehensive Test Bench for Leaf Spring Suspension System

technical field

The invention relates to the field of automobile leaf spring suspension tests, in particular to a comprehensive test bench for leaf spring suspension systems.

Background technique

Currently, rigs for measuring leaf spring stiffness are limited to radial stiffness. When testing the radial stiffness of the leaf spring, the leaf spring assembly is generally installed on the test bench, and one end of the leaf spring is fixed to the bench by a pin shaft to ensure its degree of freedom of rotation. The other end is connected with the sliding trolley through the pin shaft to ensure that it can rotate around the pin shaft and move automatically along the length direction. A load is applied to the leaf spring saddle bolt so that its radial stiffness can be measured. However, there is no test bench for measuring the longitudinal angle steel degree, radial stiffness and matching of leaf springs, swing lugs and axles of leaf spring suspension systems (systems including pendulum lugs and roll lugs).

The stiffness of the leaf spring suspension system is closely related to the bias frequency of the vehicle. During the start and deceleration stages of the vehicle, the longitudinal angle stiffness of the leaf spring suspension system is very important to the comfort of the vehicle. In addition, in the running process of the car, it is the leaf spring suspension system that actually works. However, there is still a lack of relevant test benches for the matching of the leaf spring suspension system. At the same time, most of the stiffness tests of the axle housing are aimed at the bending stiffness and strength, and there is still a lack of test benches for the torsional rigidity of the axle housing. So there is an urgent need for a test bench to measure the longitudinal angular stiffness, radial stiffness, axle or axle housing torsional stiffness, and strength test bench of the steel leaf spring suspension system.

Contents of the invention

The object of the present invention is to provide a comprehensive test bench for a leaf spring suspension system with diversified measurement functions and easy operation.

In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a comprehensive test bench for leaf spring suspension system. Dovetail groove, the tested part system is set at the upper center of the base, and the tested part system includes a horizontally arranged H-shaped frame. ear, the ear seat of the front ear is connected to the first adjustment piece, the ear seat of the rear ear is connected to the second adjustment piece, and the first adjustment piece and the second adjustment piece are respectively connected to the frame. form a detachable connection; the front lugs and rear lugs respectively form a detachable connection with the swing lugs and roll lugs provided at both ends of the main spring of the leaf spring; the main spring of the leaf spring and the auxiliary spring of the leaf spring arranged above it Set in the inverted U-shaped saddle bolt, the threaded rod part at the lower end of the saddle bolt forms a detachable connection with the axle housings on both sides of the axle. Connection, the inner side of the hub of the wheel is equipped with a brake, and the brake is fixed on the axle housing of the axle through bolt connection;

The four corners of the lower end surface of the frame are respectively connected to a mounting plate, and the mounting plate is respectively connected with the vertical loading system and the vertical displacement measurement system arranged below it to form a detachable connection. The vertical loading system, the vertical displacement measurement system and the base form a detachable connection between;

The outer surface of the wheel hub of the wheel forms a detachable connection with the clamping system. The clamping system includes a horizontally placed cylindrical connector, and a connecting flange provided on one end surface of the connector forms a Detachable connection, the connecting flange provided on the other end face of the cylindrical connector is connected with one end face of the power transmission gear;

The connecting flange of the cylindrical connector close to the end of the power transmission gear also forms a detachable connection with the front-end mounting plate in the angle measurement system. The front-end mounting plate is connected to one end of the transmission rod, and the other end of the transmission rod It is connected to the rotating part provided in the angle sensor housing, the housing of the angle sensor is connected to one end face of the rear end mounting plate, and the other end end face of the rear end mounting plate is connected to the vertical side of the vertically placed I-shaped fixing plate, The upper end surface of the fixed plate forms a detachable connection with the bottom surface of the horizontal beam of the gantry frame, and the lower end surface of the fixed plate forms a detachable connection with the bottom frame. The respective lower parts of the two legs of the gantry frame are opposite to each other. The two sides of the two sides are respectively connected with the vertical side of a right-angle plate by bolts, and the horizontal plane of the right-angle plate is fixed on the auxiliary support plate by bolts, and the auxiliary support plate and the base form a detachable connection;

The cylindrical clamp in the rear axle locking system is arranged near the outer surface of the connecting piece, and the described rear axle locking system also includes clamps arranged on the cylindrical clamp, and there is a gap of 1mm between the clamping clamp and the outer surface of the connecting piece. -2mm gap; the clamp is sequentially connected with the dowel rod and the electromagnetic brake, the cylindrical clamp and the electromagnetic brake are installed on the bracket, and the bottom of the bracket forms a detachable connection with the chassis;

The power transmission gear meshes with the second transmission pinion in the torque loading and measuring system, the torque loading and measuring system includes a loading motor, the base of the loading motor is installed on the mobile base plate; the output end of the loading motor Connect the plum blossom coupling and the input end of the torque sensor in turn, and the output end of the torque sensor connects the plum blossom coupling and the rotating shaft of the first transmission pinion in turn, the first transmission pinion meshes with the first transmission bull gear, and the first transmission bull gear The first planetary gear set, the second planetary gear set, and the second transmission pinion are connected in sequence. The first planetary gear set includes a first sun gear that is coaxially arranged with the rotation shaft of the first transmission bull gear and rotates together. A first planetary carrier is arranged on the outside of a sun gear, and a first planetary gear is sleeved on the first planetary carrier, and the first planetary gear meshes with the first sun gear and the first ring gear respectively; the first planetary carrier and the second planetary The rotating shaft of the second sun gear in the gear set rotates together; the second planetary carrier is arranged outside the second sun gear, and the second planetary gear is sleeved on the second planetary carrier, and the second planetary gear is respectively connected with the second sun gear and the second gear ring meshing; the rotating shaft of the second planet carrier and the second transmission pinion rotate together;

The rotating shaft of the first transmission bull gear and the rotating shaft of the second transmission pinion are respectively installed in the through holes provided on the two ends of the reduction mechanism casing, the reduction mechanism casing and the base angle are welded, and the base angle is fixed on the mobile through bolt connection. On the bottom plate; there is a rectangular hole on the side of the reduction mechanism box;

The outer surface of the first ring gear of the first row of planetary gear sets and the outer surface of the second ring gear of the second row of planetary gear sets are respectively in contact with the inner surface of an annular braking band in the protection system; The protection system also includes a direct-acting electromagnetic brake. The two ends of the brake band form a ring shape with a gap in the inner cavity of the reduction mechanism box. The two ends of the brake band extend The rectangular small hole set on the side of the deceleration mechanism box is connected with the brake shoe installed on the electromagnetic brake. The brake shoe can push the brake band to move, so that the brake band is closely attached to the first ring gear and the second ring gear respectively. connected into a whole;

The electromagnetic brake is installed on the rectangular frame, and the lower end of the rectangular frame is connected with the mobile base plate in the evacuation system through bolts; the evacuation system also includes slide rails arranged at corresponding positions on the base, and the slide rails are arranged near the slide rails in parallel with it. The lead screw, the slide rail and the two longitudinal beams of the frame are arranged perpendicular to each other; the sliding block adapted to it is installed on the slide rail, and the bottom surface of the moving bottom plate is fixedly connected with the upper surface of the sliding block; the side of the sliding block It is also fixedly connected with the guide block installed on the leading screw, one end of the leading screw is connected with the plum blossom coupling and the stepping motor in turn, the other end is installed on the slide rail through the bearing, and the base of the stepping motor is installed on the slide rail.

Preferably, the vertical loading system includes a vertically arranged worm, the upper end of the worm is sequentially connected to the first upper backing plate and the mounting plate by bolts, and the lower end of the worm is sequentially connected to the first lower backing plate and the base by bolts, The lower bottom surface of the first upper backing plate is provided with a worm wheel engaged with the worm, and the worm wheel is connected with the driving motor arranged on the lower bottom surface of the first upper backing plate.

Preferably, the vertical displacement measurement system includes a vertically arranged linear displacement sensor, the lower end of the displacement sensor is connected with the second lower backing plate and the base through bolts in turn, and the upper end of the displacement sensor is connected with the push rod and the second upper backing plate in turn. , The mounting plate constitutes a detachable connection.

Preferably, the number of teeth of the first pinion gear is 20, the number of teeth of the first large gear is 60, the number of teeth of the second pinion gear is 100, and the number of teeth of the power transmission gear is 150; the number of teeth of the first sun gear and the second sun gear 14, the number of teeth of the first planetary gear and the second planetary gear is 42, the number of teeth of the first ring gear and the second ring gear is 98; The modulus is 2.5, the pressure angle is 20°, and the thickness is 30mm.

Preferably, the inner diameter of the plum blossom coupling is 18mm, the outer diameter is 40mm, and the maximum torque is 60N×m; the loading motor is a 220V three-phase AC motor with a rated power of 7KW, and the measuring range of the torque sensor is 0- 100N×m.

According to any one of the above-mentioned leaf spring suspension system comprehensive test benches, the test method includes installation, calibration, and measurement; in the measurement steps, when the angle signal collected by the angle sensor remains unchanged or decreases, It means that the torque provided by the loading motor is insufficient, causing the main spring of the leaf spring to rebound. At this time, reduce the braking force on the electromagnetic brake to make the first planetary gear set idling to protect the loading motor.

The comprehensive test bench of the leaf spring suspension system includes the following systems: the system to be tested, the clamping system, the torque loading and measuring system, the rotation angle measuring system, the rear axle locking system, the AC motor protection system, the torque loading and measuring system system, evacuation system, vertical loading system, vertical displacement measurement system.

When testing the longitudinal angular stiffness of the leaf spring suspension system, the loading system in the vertical direction acts as a fixed frame, and the vertical displacement measurement system is withdrawn. First, the torque is provided by the AC motor in the torque loading and measuring system. After passing through the torque sensor and the deceleration mechanism, the leaf spring suspension system fixed by the clamping system is twisted through gear meshing. The torsion angle of the leaf spring suspension system is measured with a rotation angle measuring system. When twisted to a specified angle, the locking system locks the cylindrical connecting piece that follows the twist of the leaf spring suspension system to prevent the leaf spring from rebounding. Then turn off the AC motor, loosen the braking band in the torque loading and measuring system, let the first planetary gear set, the first planetary gear in the second planetary gear set, and the second planetary gear rotate on their own, and release the leaf spring to apply the load on the torque frame. stress on the system. At the same time, use the evacuation system to evacuate the torque loading and measuring system to prevent damage to the loading system when the leaf spring rebounds. Then release the locking system to allow the leaf spring suspension system to rotate freely after twisting. During the entire test process, the torque sensor measures the torque of the AC motor, and calculates the torque applied to the leaf spring suspension system after conversion of the transmission ratio. The angle sensor measures the torsion angle of the leaf spring suspension system and the free torsion attenuation after the locking system is released. Through the data on the torque sensor and angle sensor, the longitudinal angular stiffness of the leaf spring suspension system and the leaf spring's passing through can be calculated. Torsion frequency after torsion release.

When measuring the radial stiffness of the leaf spring suspension system, the withdrawal torque loads and measures the system and the locking system, and the loading system in the vertical direction plays a loading role. First, use the cylindrical connector in the clamping system to fix the vertical displacement of the rear axle, and then use the stepper motors installed at the four corners of the frame to work synchronously at a fixed speed and a fixed pulse frequency, and apply torque to the worm to push The frame moves up. At the same time, because of the one-way transmission characteristic of the worm gear mechanism, the stepper motor can be protected. During the test, the displacement sensor measures the vertical displacement of the leaf spring suspension system, and the radial stiffness of the leaf spring suspension system can be measured by calculating the torque of the stepping motor from the moment-frequency characteristic curve of the stepping motor.

When performing the torsional rigidity or strength test of the axle housing, the torque loading method is the same as that for the longitudinal angular stiffness test of the leaf spring suspension system. Withdraw the leaf spring suspension system, H-shaped frame, tires, vertical loading system and vertical displacement measurement system, and at the same time evacuate the torque loading and measurement system on the right side, leaving only the clamping system on the right side. Secure the rear axle first on the right with the clamping system. Afterwards, the torque is provided by the AC motor in the torque loading and measuring system. After passing through the torque sensor and the reduction mechanism, the axle housing fixed by the clamping system is twisted through gear meshing. Calculate the torsional strength and stiffness of the axle housing through the data of the torque sensor, angle sensor and strain gauge.

The beneficial effects of the present invention are: the test bench can test the steel plate composed of the main spring of the leaf spring and the lifting lugs and pendulum lugs respectively provided at both ends thereof, the secondary spring of the leaf spring and the lifting lugs and pendulum lugs respectively provided at both ends thereof, and the frame The spring suspension system can accurately measure the longitudinal angle stiffness and radial stiffness. At the same time, it can conduct dynamic tests on the leaf spring suspension system, and can also be used as a test bench for matching the leaf spring suspension system with the axle. The leaf spring suspension system is connected with the axle, and the torsional rigidity test of the axle housing is carried out; this test bench can carry out multiple tests separately, and the operation steps of each test are easy to operate and have strong practicability.

Description of drawings

Figure 1 is an exploded axonometric view of the comprehensive test bench for longitudinal angular stiffness or radial stiffness tests;

Figure 2 is a schematic diagram of the system structure of the tested piece;

Figure 3 is a schematic structural diagram of the clamping system;

Fig. 4 is a schematic structural diagram of the torque loading and measuring system;

Fig. 5 is a schematic diagram of the partial structure of the torque loading and measuring system;

Figure 6 is an axonometric view of the evacuation system;

Fig. 7 is a schematic structural diagram of the vertical loading system and the vertical displacement measurement system;

Figure 8 is a schematic diagram of the axle housing torsion test performed on the comprehensive test bench;

Figure 9 is a schematic diagram of the location of the strain gauges.

Detailed ways

The leaf spring suspension system described in this application includes: a leaf spring main spring 103 and its two ends respectively provided with pendulum lugs and roll lugs, leaf spring secondary spring 106 and its two ends respectively provided with pendulum lugs and roll lugs, front Lifting lug 211, rear lifting lug 210, frame 208;

A kind of leaf spring suspension system comprehensive test bench as shown in Fig. 1-Fig. The DUT system 1 is set at the upper central position, and the DUT system 1 includes a horizontally arranged H-shaped frame 208, and the front lifting lugs 211 and the rear lifting lugs 210 are respectively set on the outer sides of the two longitudinal beams of the frame 208. The ear seat of the front ear 211 is connected with the first adjustment piece 213, the ear seat of the rear ear 210 is connected with the second adjustment piece 212, and the first adjustment piece 213 and the second adjustment piece 212 are connected with the first adjustment piece 212 respectively. A detachable connection is formed between the frames 208, which can be a bolt-type detachable connection, a buckle-type detachable connection, or an adhesive-type detachable connection; the front lifting lug 211, the rear lifting lug 210 and the pendulum lug 104 and the rolling lug arranged at the two ends of the leaf spring main spring 103 respectively form a detachable connection; In the saddle bolt 105, the threaded rod part at the lower end of the saddle bolt 105 forms a detachable connection with the axle housings on both sides of the axle 102, and the axle shafts arranged in the axle housings on the left and right sides of the axle 102 are respectively connected to a wheel 101 by bolts. , the inner side of the hub of the wheel 101 is provided with a brake, and the brake is fixed on the axle housing of the axle 102 through bolt connection;

The four corner points of the lower end surface of the frame 208 are respectively connected with a mounting plate 209, and the mounting plate 209 forms a detachable connection with the vertical loading system 8 and the vertical displacement measurement system 9 arranged below it respectively. The vertical loading system 8, A detachable connection is formed between the vertical displacement measuring system 9 and the base 214;

The outer surface of the hub of the wheel 101 forms a detachable connection with the clamping system 2. The clamping system 2 includes a horizontally placed cylindrical connector 205, and a connecting flange 206 provided on one end of the connector 205 is connected to the The outer surface of the wheel hub of the wheel 101 forms a detachable connection, and the connecting flange 206 provided on the other end surface of the connecting piece 205 is connected to one end surface of the power transmission gear 207;

The connecting flange 206 of the cylindrical connector 205 near the end of the power transmission gear 207 also forms a detachable connection with the front-end mounting plate 404 in the angle measurement system 4, and the front-end mounting plate 404 is connected to one end of the transmission rod 402 Connection, the other end of the transmission rod 402 is connected with the rotating part provided in the housing of the angle sensor 403, the housing of the angle sensor 403 is connected with the rear end face mounting plate 401, the rear end face mounting plate 401 is connected with the vertically placed I-shaped fixed plate The vertical side of 204 is connected, the upper end surface of the fixed plate 204 forms a detachable connection with the horizontal beam bottom surface of the gantry frame 201, and the lower end surface of the fixed plate 204 forms a detachable connection with the base 214. The gantry The opposite two sides of the lower parts of the two legs of the frame 201 are respectively connected with the vertical side of a right-angle plate 203 by bolts. 214 constitutes a detachable connection;

The cylindrical clamp 505 in the rear axle locking system 5 is arranged near the outer surface of the connecting piece 205, and the described rear axle locking system 5 also includes a clamp 501 arranged on the cylindrical clamp 505, and the clamping clamp 501 and the connecting piece There is a 1mm-2mm gap between the outer surfaces of 205; the clamp 501 is connected with the dowel bar 504 and the electromagnetic brake 502 in turn, and the cylindrical clamp 505 and the electromagnetic brake 502 are installed on the bracket 503, and the bottom of the bracket 503 form a detachable connection with the base 214;

The power transmission gear 207 meshes with the second transmission pinion 307 in the torque loading and measuring system 3, the torque loading and measuring system 3 includes a loading motor 301, and the base of the loading motor 301 is installed on the mobile base plate 701; The output end of the loading motor 301 is connected to the quincunx coupling 302 and the input end of the torque sensor 303 in turn, and the output end of the torque sensor 303 is connected to the quincunx coupling 302 and the rotating shaft of the first transmission pinion 304 in turn, and the first transmission pinion 304 meshes with the first transmission bull gear 305, and the first transmission bull gear 305 is sequentially connected to the first planetary gear set, the second planetary gear set, and the second transmission pinion 307, and the first planetary gear set includes the The rotating shaft of the big gear 305 is set coaxially and co-rotates with the first sun gear 311, the first planet carrier 312 is arranged outside the first sun gear 311, the first planet gear 310 is sleeved on the first planet carrier 312, and the first planet gear 310 Mesh with the first sun gear 311 and the first ring gear 313 respectively; the rotation shaft of the first planet carrier 312 and the second sun gear 316 in the second planetary gear set rotate together; the outer side of the second sun gear 316 is provided with a second The planet carrier 317, the second planet carrier 317 is sleeved with the second planetary gear, and the second planetary wheel meshes with the second sun gear 316 and the second ring gear 306 respectively; the second planet carrier 317 and the second transmission pinion The rotating shafts of 307 rotate together;

The rotating shaft of the first transmission bull gear 305 and the rotating shaft of the second transmission pinion 307 are respectively installed in the through holes provided on both ends of the reduction mechanism casing 308, the reduction mechanism casing 308 and the base angle 309 are welded, and the base angle 309 It is fixed on the mobile base plate 701 through bolt connection; a rectangular small hole 314 is opened on the side of the reduction mechanism box 308;

The outer surface of the first ring gear 313 of the first row of planetary gear sets, the outer surface of the second ring gear 306 of the second row of planetary gear sets are respectively connected to the outer surface of an annular braking band 603 in the protection system 6 The inner surface is in contact; the protection system 6 also includes a direct-acting electromagnetic brake 601, and the two ends of the braking band 603 form a ring shape with a gap in the inner cavity of the reduction mechanism box 308, making The two ends of the moving belt 603 protrude from the rectangular aperture 314 provided on the side of the reduction mechanism casing 308 and are connected with the brake shoe 602 installed on the electromagnetic brake 601. The brake shoe 602 can push the brake belt 603 to move, so that the brake The belt 603 is closely attached to and connected with the first ring gear 313 and the second ring gear 306 respectively;

The electromagnetic brake 601 is installed on the rectangular frame 604, and the lower end of the rectangular frame 604 is connected with the mobile base plate 701 in the evacuation system 7 through bolts; the evacuation system 7 also includes slide rails arranged at corresponding positions on the base 214 704, the lead screw 702 parallel to it is set near the slide rail 704, and the two longitudinal beams of the slide rail 704 and the frame 208 are arranged perpendicular to each other; It is fixedly connected with the upper surface of the slider 708; the side of the slider 708 is also fixedly connected with the guide block 706 installed on the lead screw 702, and one end of the lead screw 702 is connected with the plum blossom coupling 705 and the stepper motor 703 in turn, The other end is installed on the slide rail 704 through a bearing, and the base of the stepping motor 703 is installed on the slide rail 704 .

The vertical loading system 8 includes a vertically arranged worm 802, the upper end of the worm 802 is connected with the first upper backing plate 804 and the mounting plate 209 by bolts successively, and the lower end of the worm 802 is connected with the first lower backing plate 801 and the base successively. 214 are connected by bolts, the lower bottom surface of the first upper backing plate 804 is provided with a worm wheel 805 meshed with the worm 802, and the worm wheel 805 is connected with the drive motor arranged on the lower bottom surface of the first upper backing plate 804.

The vertical displacement measurement system 9 includes a vertical linear displacement sensor 902, the lower end of the displacement sensor 902 is connected with the second lower backing plate 901 and the base 214 by bolts, and the upper end of the displacement sensor 902 is connected with the push rod 903, the first The second upper backing plate 904 and the mounting plate 209 form a detachable connection.

A better embodiment is: the number of teeth of the first pinion 304 is 20, the number of teeth of the first large gear 305 is 60, the number of teeth of the second pinion 307 is 100, and the number of teeth of the power transmission gear 207 is 150; The number of teeth of the sun gear 311 and the second sun gear 316 is 14, the number of teeth of the first planetary gear 310 is 42, the number of teeth of the first ring gear 313 and the second ring gear 306 is 98; the first small gear 304 and the first large gear The modulus of 305, the second pinion 307, and the power transmission gear 207 are all 2.5, the pressure angle is 20°, and the thickness is 30mm.

A better embodiment is: the inner diameter of the plum blossom coupling 302 is 18mm, the outer diameter is 40mm, and the maximum torque is 60N×m; the loading motor 301 is a 220V three-phase AC motor with a rated power of 7KW, and the torque The measuring range of the sensor 403 is 0-100N×m.

The test method of the test bench includes installation, calibration, and measurement; in the measurement step, when the angle signal collected by the angle sensor 403 remains unchanged or decreases, it means that the torque provided by the loading motor 301 is insufficient, resulting in the main force of the leaf spring. The spring 103 is about to rebound, and at this moment, the braking force on the electromagnetic brake 601 is reduced, so that the first planetary gear set is idling to protect the loading motor 301 .

Described test bench can carry out following test respectively:

Longitudinal angular stiffness test of the leaf spring suspension system: firstly, the tested part system 1, clamping system 2, torque loading and measuring system 3, rotation angle measuring system 4, rear axle locking system 5, AC motor protection system 6, evacuation System 7, vertical loading system 8 and vertical displacement measuring system 9 are connected according to the connection relationship described in claim 1, and vertical loading system 8 plays the effect of fixing H-shaped frame 208; Open AC motor protection system 6, make The first ring gear 313 in the first planetary gear set and the second ring gear 306 in the second planetary gear set are locked by the braking band 603 . Then turn on the loading motor 301, which drives the quincunx coupling 302 and the torque sensor 303 to rotate in turn, and the output shaft of the torque sensor 303 drives the first transmission pinion 304, the first transmission bull gear 305, and the first sun gear through the quincunx coupling 302 in turn. 311, the first planetary carrier 312, the second sun gear 316, the second planetary carrier 317, the second transmission pinion 307, the power transmission gear 207, and the connector 205 rotate, and the connector 205 drives the leaf spring main spring 103 and the leaf spring auxiliary spring 106 to reverse.

When the leaf spring main spring 103 and the leaf spring auxiliary spring 106 are twisted to the set angle, the electromagnetic brake 502 acts to lock the cylindrical connector 205, and simultaneously closes the loading motor 301, and reduces the braking force of the brake caliper 602, The two sets of planetary gear sets in the torque loading and measuring system 3 are idling, and the torsion force exerted by the leaf spring main spring 103 and the leaf spring secondary spring 106 on the second transmission pinion 307 is released. Then start the stepping motor 703, drive the mobile base plate 701 to drive the torque loading and measuring system 3 to move, so that the second transmission pinion 307 and the power transmission gear 207 are disengaged; after that, the electromagnetic brake 502 is released to release the locking of the connector 205 state, at this moment, the axle 102 and the connector 205 will twist back and forth under the rebound effect of the leaf spring main spring 103 and the leaf spring secondary spring 106.

During the test, by measuring the values of the torque sensor 303 and the angle sensor 403, it is possible to calculate the leaf spring main spring 103 and the swing lugs and roll lugs respectively provided at both ends of the leaf spring, the leaf spring secondary spring 106 and the positions respectively provided at both ends. The longitudinal angular stiffness of the leaf spring suspension system composed of pendulum lugs and roll lugs and the torsional frequency of the entire DUT system 02 after torsion release.

Radial stiffness test of leaf spring suspension system: pull out torque loading and measuring system 3, pull out system 7; start the driving motor connected to worm wheel 805 in vertical loading system 8, the rotation of worm wheel 805 drives worm 802 to reciprocate up and down, and the frame The drive motors in the 4 vertical loading systems 8 connected by 208 work synchronously at a fixed pulse frequency; the leaf spring suspension system undergoes vertical displacement, and the displacement sensor 902 collects the vertical displacement parameters of the leaf spring suspension system, and the vertical displacement The radial stiffness of the leaf spring suspension system is calculated from the parameters and the torque-frequency characteristic curve of the drive motor.

Dynamic characteristic test of the leaf spring suspension system: the connection mode and loading method of each part of the test bench are consistent with the radial stiffness test of the leaf spring suspension system, and the test only needs to apply loads of different amplitudes through the drive motor in the vertical loading system 8 , through the data of the displacement sensor 902 and the torque-frequency characteristic curve of the drive motor, the dynamic stiffness change of the suspension system at different amplitudes is calculated.

Axle case torsional rigidity test: As shown in Figure 8, the outer hubs of the wheels 101 on both sides of the axle 102 are respectively connected to the connector 205, the rotation angle measurement system 4, and the clamping system 2 in sequence, and the two connectors 205 One of them is connected to the torque loading and measuring system 3, and the other connecting piece 205 is disconnected from the torque loading and measuring system 3; according to the positions a1-a12 in Fig. 9, stick 12 pressure points on the axle housing of the axle 102 in sequence. Strain gauges, start the loading motor 301 , and the axle housing of the axle 102 is twisted under the action of the torque loading and measuring system 3 . Record the data of the torque sensor 303 , the angle sensor 403 , and the pressure strain gauge to calculate the strength and stiffness of the axle housing of the axle 102 .

Claims (3)

1. A comprehensive test bed for a leaf spring suspension system comprises a base (214), wherein a plurality of dovetail grooves which are parallel to each other and used for mounting bolts are formed in the upper surface of the base (214), a tested part system (1) is arranged at the center above the base (214), the tested part system (1) comprises an H-shaped frame (208) which is horizontally arranged, front lifting lugs (211) and rear lifting lugs (210) are respectively arranged on the side edges of the outer sides of two longitudinal beams of the H-shaped frame (208), the lug seat of each front lifting lug (211) is connected with a first adjusting piece (213), the lug seat of each rear lifting lug (210) is connected with a second adjusting piece (212), and the first adjusting piece (213) and the second adjusting piece (212) are detachably connected with the frame (208); the front lifting lug (211) and the rear lifting lug (210) are detachably connected with a swing lug (104) and a rolling lug which are arranged at two ends of the steel plate spring main spring (103) respectively; the steel plate spring main spring (103) and the steel plate spring auxiliary spring (106) arranged above the steel plate spring main spring are sleeved in an inverted U-shaped riding bolt (105), a threaded rod part at the lower end of the riding Ma Luoshuan (105) and axle housings on two sides of an axle (102) form detachable connection, half shafts arranged in the axle housings on the left side and the right side of the axle (102) are respectively connected with a wheel (101) through a bolt, a brake is arranged on the inner side of a hub of the wheel (101), and the brake is fixedly connected on the axle housing of the axle (102) through a bolt; the method is characterized in that: 4 corner points of the lower end face of the frame (208) are respectively connected with a mounting plate (209), the mounting plate (209) is detachably connected with a vertical loading system (8) and a vertical displacement measuring system (9) which are arranged below the mounting plate, and the vertical loading system (8), the vertical displacement measuring system (9) and the base (214) are detachably connected;

the outer side face of a hub of the wheel (101) is detachably connected with the clamping system (2), the clamping system (2) comprises a horizontally placed cylindrical connecting piece (205), a connecting flange (206) arranged on one end face of the connecting piece (205) is detachably connected with the outer side face of the hub of the wheel (101), and a connecting flange (206) arranged on the other end face of the cylindrical connecting piece (205) is connected with one end face of the force transmission gear (207);

the connecting flange (206) at one end of the cylindrical connecting piece (205) close to the force transmission gear (207) is also detachably connected with a front end face mounting plate (404) in the angle measuring system (4), the front end face mounting plate (404) is connected with one end of a transmission rod (402), the other end of the transmission rod (402) is connected with a rotating part arranged in a shell of an angle sensor (403), the shell of the angle sensor (403) is connected with one end face of a rear end face mounting plate (401), the other end face of the rear end face mounting plate (401) is connected with a vertical side face of a vertically placed I-shaped fixing plate (204), the upper end face of the fixing plate (204) is detachably connected with the bottom face of a horizontal beam of the portal frame (201), the lower end face of the fixing plate (204) is detachably connected with a base (214), two side faces opposite to the lower parts of two support legs of the portal frame (201) are respectively connected with the vertical side face of a right-angle plate (203) through bolts, the horizontal plane of the right-angle plate (203) is fixed on the auxiliary support plate (202) through bolts, and the auxiliary support plate (202) is detachably connected with the base (214);

a cylindrical clamp (505) in the rear axle locking system (5) is arranged near the outer side surface of the connecting piece (205), the rear axle locking system (5) further comprises a clamp (501) arranged on the cylindrical clamp (505), and a gap of 1mm-2mm is formed between the clamp (501) and the outer side surface of the connecting piece (205); the clamp (501) is sequentially connected with a dowel bar (504) and an electromagnetic brake (502), the cylindrical clamp (505) and the electromagnetic brake (502) are installed on a support (503), and the bottom of the support (503) is detachably connected with a chassis (214);

the force transmission gear (207) is meshed with a second transmission pinion (307) in the torque loading and measuring system (3), the torque loading and measuring system (3) comprises a loading motor (301), and the base of the loading motor (301) is installed on a movable bottom plate (701); the output end of the loading motor (301) is sequentially connected with the input ends of a plum blossom coupling (302) and a torque sensor (303), the output end of the torque sensor (303) is sequentially connected with rotating shafts of the plum blossom coupling (302) and a first transmission pinion (304), the first transmission pinion (304) is meshed with a first transmission big gear (305), the first transmission big gear (305) is sequentially connected with a first planetary gear set, a second planetary gear set and a second transmission pinion (307), the first planetary gear set comprises a first sun gear (311) which is coaxially arranged with the rotating shaft of the first transmission big gear (305) and rotates together, a first planet carrier (312) is arranged on the outer side of the first sun gear (311), the first planet gear (310) is sleeved on the first planet carrier (312), and the first planet gear (310) is respectively meshed with the first sun gear (311) and a first gear ring (313); the rotating shaft of the first planet carrier (312) and the rotating shaft of a second sun gear (316) in the second planetary gear set rotate together; a second planet carrier (317) is arranged on the outer side of the second sun gear (316), a second planet gear (318) is sleeved on the second planet carrier (317), and the second planet gear (318) is meshed with the second sun gear (316) and the second gear ring (306) respectively; the rotating shafts of the second planet carrier (317) and the second transmission pinion (307) rotate together;

a rotating shaft of the first transmission large gear (305) and a rotating shaft of the second transmission small gear (307) are respectively installed in through holes arranged on two end faces of the reduction mechanism box body (308), the reduction mechanism box body (308) is welded with a base angle (309), and the base angle (309) is fixedly connected to the movable bottom plate (701) through bolts; a rectangular small hole (314) is formed in the side surface of the speed reducing mechanism box body (308);

the outer side surface of a first gear ring (313) of the first planetary gear set and the outer side surface of a second gear ring (306) of the second planetary gear set are respectively contacted with the inner side surface of a circular ring-shaped brake belt (603) in the protection system (6); the protection system (6) further comprises a direct-acting electromagnetic brake (601), two ends of the brake belt (603) form a circular ring shape with a notch in an inner cavity of the speed reducing mechanism box body (308), two ends of the brake belt (603) extend out of rectangular small holes (314) formed in the side face of the speed reducing mechanism box body (308) and are connected with brake shoes (602) mounted on the electromagnetic brake (601), and the brake shoes (602) can push the brake belt (603) to move, so that the brake belt (603) is respectively attached to the first gear ring (313) and the second gear ring (306) and is connected into a whole;

the electromagnetic brake (601) is installed on a rectangular frame (604), and the lower end of the rectangular frame (604) is connected with a movable bottom plate (701) in the evacuation system (7) through a bolt; the evacuation system (7) further comprises a sliding rail (704) arranged at a corresponding position on the base (214), a lead screw (702) parallel to the sliding rail (704) is arranged near the sliding rail (704), and the sliding rail (704) and two longitudinal beams of the frame (208) are arranged perpendicular to each other; a sliding block (708) matched with the sliding rail (704) is installed on the sliding rail (704), the bottom surface of a movable bottom plate (701) is fixedly connected with the sliding block (708) and the upper surface of a guide block (706), the guide block (706) is in threaded fit with a lead screw (702), one end of the lead screw (702) is sequentially connected with a quincuncial coupling (705) and a stepping motor (703), the other end of the lead screw is installed on the sliding rail (704) through a bearing, and a base of the stepping motor (703) is installed on the sliding rail (704);

the comprehensive test bed for the steel plate spring suspension system performs a test method, wherein the test method comprises the steps of installation, correction and measurement; in the measuring step of the test method, when an angle signal acquired by an angle sensor (403) is maintained unchanged or reduced, the torque provided by a loading motor (301) is insufficient, so that a leaf spring main spring (103) is about to rebound, and the braking force on an electromagnetic brake (601) is reduced, so that the first planetary gear set idle rotation protects the loading motor (301);

the vertical loading system (8) comprises a vertically arranged worm (802), the upper end of the worm (802) is sequentially connected with a first upper base plate (804) and a mounting plate (209) through bolts, the lower end of the worm (802) is sequentially connected with a first lower base plate (801) and a base (214) through bolts, a worm wheel (805) meshed with the worm (802) is arranged on the lower bottom surface of the first upper base plate (804), and the worm wheel (805) is connected with a driving motor arranged on the lower bottom surface of the first upper base plate (804);

the vertical displacement measurement system (9) comprises a vertically arranged linear displacement sensor (902), the lower end of the displacement sensor (902) is sequentially connected with a second lower backing plate (901) and a base (214) through bolts, and the upper end of the displacement sensor (902) is sequentially connected with a push rod (903), a second upper backing plate (904) and a mounting plate (209) in a detachable mode.

2. The integrated test stand for a leaf spring suspension system according to claim 1, characterized in that: the number of teeth of the first transmission small gear (304) is 20, the number of teeth of the first transmission big gear (305) is 60, the number of teeth of the second small gear (307) is 100, and the number of teeth of the force transmission gear (207) is 150; the number of teeth of the first sun gear (311) and the second sun gear (316) is 14, the number of teeth of the first planet gear (310) and the second planet gear (318) is 42, and the number of teeth of the first gear ring (313) and the second gear ring (306) is 98; the modulus of the first transmission small gear (304), the first transmission big gear (305), the second small gear (307) and the force transmission gear (207) is 2.5, the pressure angle is 20 degrees, and the thickness is 30mm.

3. The integrated test stand for a leaf spring suspension system according to claim 1, characterized in that: the inner diameter of the plum coupling (302) is 18mm, the outer diameter of the plum coupling is 40mm, and the maximum torque is 60 N.m; the loading motor (301) is a 220V three-phase alternating current motor with rated power of 7KW, and the measuring range of the torque sensor (403) is 0-100 N.m.

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