CN110146306B - Rolling resistance testing device and rolling resistance testing method - Google Patents
Rolling resistance testing device and rolling resistance testing method Download PDFInfo
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- CN110146306B CN110146306B CN201910528988.1A CN201910528988A CN110146306B CN 110146306 B CN110146306 B CN 110146306B CN 201910528988 A CN201910528988 A CN 201910528988A CN 110146306 B CN110146306 B CN 110146306B
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- 238000012360 testing method Methods 0.000 title claims abstract description 134
- 238000005096 rolling process Methods 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 claims description 27
- 230000003071 parasitic effect Effects 0.000 claims description 17
- 238000000926 separation method Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- DOSMHBDKKKMIEF-UHFFFAOYSA-N 2-[3-(diethylamino)-6-diethylazaniumylidenexanthen-9-yl]-5-[3-[3-[4-(1-methylindol-3-yl)-2,5-dioxopyrrol-3-yl]indol-1-yl]propylsulfamoyl]benzenesulfonate Chemical compound C1=CC(=[N+](CC)CC)C=C2OC3=CC(N(CC)CC)=CC=C3C(C=3C(=CC(=CC=3)S(=O)(=O)NCCCN3C4=CC=CC=C4C(C=4C(NC(=O)C=4C=4C5=CC=CC=C5N(C)C=4)=O)=C3)S([O-])(=O)=O)=C21 DOSMHBDKKKMIEF-UHFFFAOYSA-N 0.000 description 22
- 230000000694 effects Effects 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- 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
- G01M17/02—Tyres
- G01M17/022—Tyres the tyre co-operating with rotatable rolls
Abstract
The invention provides a rolling resistance testing device and a rolling resistance testing method, wherein the rolling resistance testing device comprises a rim, a tire load loading device, a rotary drum and a rotary drum driving device; the circumference of the rotary drum is used for contacting with the outer edge of the tire to simulate the road surface; the rotary drum driving device is connected with a supporting shaft of the rotary drum to drive the rotary drum to rotate; a torque sensor is arranged between the support shaft and the rotary drum driving device; the torque sensor is used for measuring the input torque of the rotary drum; the rim is used for being mounted on the inner edge of the tire to support the tire; the tire load loading device comprises a rotating shaft, and a rim is arranged at the end part of the rotating shaft through a rim clamp; the tire load loading device is used for pushing the rim towards the direction where the rotary drum is located so as to simulate the load of the tire. The device can test the rolling resistance of the tires of the non-motor vehicles such as bicycles, mopeds and the like, and fills the industry blank. The accuracy of the test is improved by adopting a professional rim clamp.
Description
Technical Field
The present invention relates to a tire testing device, and more particularly, to a rolling resistance testing device and a rolling resistance testing method.
Background
Tires are important components on vehicles, and acting forces between the whole vehicle and the ground are transmitted through the tires. The mechanical properties of the tire are the basis for analyzing and designing the performance of the vehicle, and have important influences on the safety, the operation stability, the smoothness and other performances of the vehicle. The tire mechanical property test bed is one of key equipment for tire property modeling, whole vehicle modeling, integration, adjustment and development, can realize various running conditions of tires, can measure motion parameters of six degrees of freedom and the relation between the motion parameters and the ground multi-component force, and is a key data source for vehicle dynamics simulation design.
For bicycles, the rolling resistance of the tire is a critical parameter affecting the riding experience of the vehicle, and for mopeds, the rolling resistance of the tire is a critical parameter for the consumption of electrical energy. Therefore, before developing and producing each batch of tires for vehicles, tire samples are produced, and then simulated road driving tests, such as a driving speed test, a endurance test, etc., are performed on the samples to ensure the riding comfort and safety of the vehicles.
Currently, the rolling resistance test is mainly performed on a tire for an automobile, and the tire is performed on a tire testing machine, and the structure of the testing machine comprises: the rotary drum is supported on the tester body and driven by the driving device, and a rim shaft for supporting a rim of a vehicle, the circumferential surface of the rotary drum is a simulated road surface, an output shaft of the driving device and a supporting shaft of the rotary drum are arranged on the same axis, and a torque sensor is arranged between the two shafts. When testing, the tyre is firstly arranged on the rim, the circumferential surface of the tyre is leaned against the circumferential surface of the rotary drum, the rim shaft is pushed to make the tyre lean against the simulated road surface on which the rotary drum rotates, a certain pressure is applied, the rotary drum is driven to rotate, the tyre rolls on the simulated road surface due to friction force, at the moment, the torque sensor displays the driving torque, and the rolling resistance of the tyre is obtained through conversion. However, the rims of motor vehicles and non-motor vehicles are quite different, and therefore, tires for bicycles cannot be directly tested with existing tire testing machines. In addition, the use environments of the tires for the motor vehicle and the tires for the non-motor vehicle are not completely the same, the motor vehicle is generally a pneumatic tire, and the shared bicycle mainly adopts a non-pneumatic solid tire at present, so that the test method and the test condition of the performance of the tire for the shared bicycle cannot directly take care of the non-motor tire.
In addition, the existing equipment is motor vehicle tire rolling resistance detection equipment, and a rotating shaft on the equipment drives a hub to rotate (the hub has no rotating bearing) so as to drive the tire to rotate. But test the bicycle hub with the bearing, the rotation friction increases the bearing friction, and the test precision is affected.
Disclosure of Invention
The invention aims to provide a rolling resistance testing device and a rolling resistance testing method according to the defects of the prior art.
The invention is realized by the following technical scheme:
a rolling resistance testing device for testing rolling resistance of a tire of a non-motor vehicle, the rolling resistance testing device comprising a rim, a tire load loading device, and a rim clamp:
the rim is used for being mounted on the inner edge of the tire; a shaft hole is formed in the rotation axis of the rim;
the rim clamp is used for fixing the rim on a rotating shaft of the tire load loading device; the rim clamp comprises a center shaft substitute and two clamping plates; the two clamping plates are oppositely arranged at two sides of the rim; the first end of the middle shaft substitute piece is provided with a limiting part, and the second end of the middle shaft substitute piece passes through the clamping plate and the shaft hole and is coaxially and fixedly connected with the rotating shaft, so that one clamping plate is abutted against the end part of the rotating shaft, and the other clamping plate is tightly attached to the rim under the pushing of the limiting part, thereby realizing the clamping of the rim.
The invention is further improved in that bearing accommodating parts are arranged at two ends of the shaft hole; and a bearing substitute is arranged on one side, attached to the rim, of the clamping plate, and the bearing substitute is accommodated in the bearing accommodating part.
The invention further improves that the clamping plate is provided with a through hole for the middle shaft substitute to pass through, and the diameter of the limiting part of the middle shaft substitute is larger than that of the through hole of the clamping plate.
The invention further improves that the rolling resistance testing device also comprises a rotary drum and a rotary drum driving device, wherein the circumferential surface of the rotary drum is used for being contacted with the outer edge of the tire to simulate the road surface; the rotary drum driving device is connected with a supporting shaft of the rotary drum to drive the rotary drum to rotate; a torque sensor is arranged between the support shaft and the rotary drum driving device; the torque sensor is used for measuring the input torque of the rotary drum; the tire load loading device is used for pushing the rim so that the tire on the rim acts on the circumferential surface of the rotary drum to simulate the load of the tire.
The rolling resistance testing device is further improved by further comprising a control module, wherein the control module is electrically connected with the tire load loading device, the rotary drum driving device and the torque sensor respectively.
A further development of the invention consists in that the rotation axis of the tyre load applying device is arranged in parallel with the support axis of the drum.
A further improvement of the present invention is that the rim comprises a unitary rim.
The invention also relates to a rolling resistance testing method by using the rolling resistance testing device, which comprises the following steps:
(1) Mounting the tire on a rim, and fixedly mounting the rim on the end of a rotating shaft of the tire load loading device through a rim clamp;
(2) Driving the drum to rotate so that the drum acts on the tire to drive the rim to rotate, and measuring the input torque T of the drum under the condition of preset parameters;
(3) Measuring parasitic loss resistance F of the rolling resistance testing device p1 ；
(4) Calculating the rolling resistance F of said tyre under the condition of predetermined parameters r The method comprises the steps of carrying out a first treatment on the surface of the Rolling resistance F r The calculation formula of (2) is as follows:
F r ＝T/R-F p1
wherein F is r T is the input torque of the drum, R is the radius of the drum, F is the rolling resistance of the tire p1 And (3) the additional loss resistance of the rolling resistance testing device.
A further improvement of the invention consists in mounting the tyre on the rim before measuring the tyre and in placing it for more than 24 hours in an environment at a temperature of 25±3 ℃.
A further improvement of the invention is that said parameter conditions comprise a test speed and/or a test load of said tyre.
A further improvement of the present invention is that,
the tire comprises a bicycle inflation-free tire, and the parameter conditions adopted when the bicycle inflation-free tire is tested comprise: the test speed is 15-25Km/h, and the test load is 60-75Kg;
the tire comprises a booster vehicle inflation-free tire, and when the booster vehicle inflation-free tire is tested, the parameter conditions adopted comprise: the test speed is 20-40Km/h, and the test load is 60-85Kg.
The invention further improves that the input torque T of the rotary drum under the condition of the preset parameters is measured, and the method specifically comprises the following steps:
(1) Applying a predetermined test load to the tire using a tire load loading device; the rotating speed of the rotary drum is regulated through a rotary drum driving device, so that the rotating speed of the tire reaches a preset test speed;
(2) Driving the tire and the rim to continuously rotate for a preset time so as to simulate the temperature rising running process of the tire;
(3) The input torque T of the drum is measured with steady conditions of the parameters.
A further improvement of the invention is to drive the tire and rim into rotation for a predetermined period of time greater than or equal to 30 minutes.
A further development of the invention consists in measuring the parasitic loss resistance F of the rolling resistance test device by means of a separation method p1 Measuring the parasitic loss resistance F of the rolling resistance test device p1 The method specifically comprises the following steps:
(1) Maintaining the rotational speed of the drum, reducing the test load of the tire to a separation limit load so that the contact surface of the tire and the drum maintains the same linear velocity; to prevent the tire from slipping;
(2) Measuring input torque T of the drum t ，
(3) Calculating the parasitic loss resistance F of the rolling resistance testing device p1 The calculation formula is as follows:
F p1 ＝T t /R
wherein F is p1 For additional loss resistance of the rolling resistance testing device, T t To test the input torque of the drum during the loss of resistance of the accessory, R is the radius of the drum.
A further improvement of the invention is that the separation limit load is 50N-100N.
The beneficial effects of the invention are as follows: the rolling resistance of the non-motor vehicle tires such as bicycles, moped and the like can be tested, and the industry blank is filled. The accuracy of the test is improved by adopting a professional rim clamp.
Drawings
FIG. 1 is a side view of a rolling resistance testing device;
FIG. 2 is a top view of the rolling resistance testing device;
FIG. 3 is a perspective view of a rim clamp;
fig. 4 is a schematic diagram of a control system of the rolling resistance testing device.
Description of the reference numerals:
the tire load device comprises a rim 1, a tire load device 2, a rotating drum 3, a rotating drum 4, a rotating drum driving device 5, a circumferential surface 6, a supporting shaft 7, a torque sensor 8, a rotating shaft 9, a rim clamp 10, a center shaft substitute 11, a clamping plate 12, a bearing substitute 13, a limiting part 14, a thread structure 15 and a control module 16.
Detailed Description
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Examples: as shown in fig. 1 and 2, an embodiment of the present invention includes a rolling resistance testing device for testing rolling resistance of a non-motor vehicle tire. The rolling resistance testing device comprises a rim 1, a tire load loading device 2, a rotary drum 3 and a rotary drum driving device 4.
The drum 3 has a cylindrical shape, and its circumferential surface 5 is adapted to contact the outer edge of the tire 6 to simulate a road surface. During the test, the outer edge of the tire 6 is attached to the circumferential surface 5 of the drum 3, and the tire 6 and the rim 1 can be rotated by driving the drum 3 to rotate.
The drum driving device 4 is connected with a supporting shaft 7 of the drum 3, and the drum driving device 4 is used for driving the drum 3 to rotate so as to simulate the running process. A torque sensor (not shown in the figure) is arranged between the support shaft 7 and the drum driving device 4; the torque sensor 8 is used to measure the input torque of the drum 3.
The rim 1 is intended to be mounted on the inner edge of a tyre 6 to support the tyre 6. The tire load loading device 2 comprises a rotating shaft 9, and a rim 1 is mounted at the end part of the rotating shaft 9 through a rim clamp 10; the tire load loading device 2 is used to push the rim 1 in the direction of the drum 3 to simulate the load of the tire 6. The rotating shaft 9 of the tyre load loading device 2 is parallel to the supporting shaft 7 of the rotary drum 3, and when the tyre load loading device 2 applies a load to the tyre, the tyre load loading device 2 pushes the rotating shaft 9 to translate towards the rotary drum 3, so that the outer edge of the tyre 6 is tightly attached to the circumferential surface of the rotary drum 3. In one embodiment, the rim 1 is an integral rim with better accuracy to avoid adverse effects on test results due to uneven tension of the spokes of the spoke rim.
During the test, after the rotation speed of the drum 3 is constant, the input torque of the drum 3 depends on the resistance of the rotation of the tyre 6 and the resistance of the parasitic losses of the respective additional components during the rotation of the rim 1. The rims of existing non-motor vehicles (bicycles, electric vehicles) must cooperate with bearings to effect rotation. The existing non-motor vehicle bearing is limited by factors such as processing cost, the additional loss resistance caused by rotation is unstable, and if the existing rim and bearing are directly used for testing, the additional loss resistance of the additional component can be greatly fluctuated, so that the testing result is inaccurate.
In this embodiment, the rim 1 is clamped and mounted on the end of the rotating shaft 9 of the tire load loading device 2 by the rim clamp 10, which makes the rim 1 unable to rotate freely, and the parasitic loss resistance of the additional components during the test is mainly the rotation resistance of the rotating shaft 9. As special equipment, the resistance and the friction coefficient of the rotating shaft 9 can be effectively controlled in the design and manufacturing processes, so that the rotating resistance of the rotating shaft 9 is smaller in value and the friction coefficient is more stable.
As shown in fig. 1 and 3, the rim clamp 10 includes a bottom bracket substitute 11 and two clamping plates 12. Two clamping plates 12 are oppositely arranged at two sides of the center of the rim 1 for clamping the rim 1. The clamping plate 12 is circular, and a through hole for the middle shaft substitute 11 to pass through is formed in the center of the clamping plate. The rotating axis of the rim 1 is provided with a shaft hole for the middle shaft substitute 11 to pass through, and the two ends of the shaft hole are provided with bearing accommodating parts; the side of the clamping plate 12 that is in contact with the rim 1 is provided with an annular bearing substitute 13, the bearing substitute 13 being accommodated in the bearing receptacle in order to prevent the rim 1 from loosening in its radial direction.
The bottom bracket substitute 11 has a rod shape, one end of which is provided with a limiting portion 14 for pushing the clamping plate 12, and the other end of which is provided with a screw structure 15. The diameter of the limiting part 14 of the middle shaft substitute 11 is larger than the diameter of the through hole of the clamping plate 12; the side surface of the limiting part 14 is provided with anti-skid patterns.
The end of the central shaft substitute 11 provided with the screw structure 15 passes through the clamping plate 12 and the rim 1 and is coaxially connected with the rotating shaft 9 of the tire load loading device 2. The end face of the rotating shaft 9 is provided with a bolt hole, and the middle shaft substitute 11 can be screwed into the bolt hole by rotating the limiting part 14 of the middle shaft substitute 11, so that the middle shaft substitute 11 is fixedly connected with the rotating shaft 9. In the process of fastening connection, one clamping plate 12 is abutted against the end part of the rotating shaft 9, and the other clamping plate 12 is tightly attached to the rim 1 under the pushing of the limiting part 14, so that the two clamping plates 12 clamp the rim.
As shown in fig. 1 and 4, the rolling resistance testing device of the present embodiment further includes a control module 16, where the control module 16 is electrically connected to the tire load loading device 2, the drum driving device 4, and the torque sensor 8, respectively. The control module 16 is used for controlling the drum driving device 4 and the tire load loading device 2. The drum driving device 4 drives the drum 3 to rotate according to a preset rotating speed under the control of the control module 16; the tire load loading device 2 is used to apply a predetermined test load to the tire 6 under the control of the control module 16.
As shown in fig. 1 to 3, an embodiment of the present invention further includes a rolling resistance testing method involving the rolling resistance testing device described above, the method including the steps of:
(1) Mounting the tire 6 to the rim 1, and fixedly mounting the rim 1 to an end of the rotating shaft 9 of the tire load applying device 2 by a rim clamp 10; before the tire 6 is measured, the tire 6 needs to be mounted on the rim 1 in advance and parked for more than 24 hours at the temperature of 25+/-3 ℃ so as to balance the temperature of the tire 6 everywhere;
(2) Driving the drum 3 in rotation so that the drum 3 acts on the tyre 6 to drive the rim 1 and the tyre 6 in rotation, measuring the input torque T of the drum 3 under predetermined parameters;
(3) Measuring parasitic loss resistance F of rolling resistance test device p1 The method comprises the steps of carrying out a first treatment on the surface of the Parasitic loss resistance F p1 Measuring by adopting a separation method;
(4) Calculating the rolling resistance F of the tire 6 under predetermined parameter conditions r . Rolling resistance F r The formula of (2) is as follows:
F r ＝T/R-F pl
wherein:
F r the rolling resistance of the tire 6 is in newtons (N);
t is the input torque of the rotary drum 3, and the unit is the Oryza sativa (N.m);
r is the radius of the rotary drum 3, and the unit is meter (m);
fp1 is the parasitic loss resistance of the rolling resistance test device.
The parameter conditions include the test speed of the tire 6, the test load of the tire 6, and the ambient temperature. In this embodiment, the test speed of the tire 6 is adjusted by the rotation speed of the drum 3, and the test speed is the linear speed of the circumferential surface of the drum 3. The range of the test speed is 50% -100% of the national standard speed range of the tire. The test load of the tire 6 is provided by the tire load loading device 2, and the value range of the test load is 80% -130% of the national standard recommended load; in the test process, the actual demand load can be adopted for testing.
In the process of selecting the parameter conditions, the parameter conditions are determined according to the type of the tire 6. When the tire 6 is a bicycle inflation-free tire, the test speed is 15-25Km/h, and the test load is 60-75Kg; in a preferred embodiment, the test speed is selected to be 20Km/h and the test load is selected to be 75Kg. When the tire 6 is a non-pneumatic tire of the booster vehicle, the test speed is selected to be 20-40Km/h, and the test load is 60-85Kg; in a preferred embodiment, the test speed is selected to be 40Km/h and the test load is selected to be 65Kg.
The measuring of the input torque T of the drum 3 under predetermined parameters comprises in particular the following steps:
(2.1) applying a predetermined test load to the tire 6 using the tire load loading device 2; and the rotating speed of the rotary drum 3 is regulated by the rotary drum driving device 4 so that the rotating speed of the tyre 6 reaches a preset test speed;
(2.2) driving the tire 6 and the rim 1 to continuously rotate for a preset time to simulate the temperature rising running process of the tire 6, wherein the process needs to be continued for more than 30 minutes to stabilize the temperature of the tire, and meanwhile, the drum driving device 4 continuously adjusts the input torque of the drum in the process to stabilize the rotating speed of the drum 3;
(2.3) the input torque T of the drum 3 is measured with the respective parameter conditions stable.
In the step (2.2), the temperature rising running process of the simulated tire 6 needs to last for more than 30 minutes, and if the temperature rising running process continues to be too short, the performance of the tire 6 is unstable; if the temperature rise driving process continues too long, the test efficiency is too low. Thus, in one embodiment, the warming travel process lasts for 10min-30min. As shown in table-1, the rolling resistance test data of test numbers 7 to 14 were fluctuated more, and the rolling resistance test data of test numbers 15 to 26 were stabilized more. As can be seen from the data in Table-1, the test data are more stable when the temperature-rising running process is continued for more than 30 minutes. Furthermore, it can be seen from the data of Table-1 that the use of an integral rim results in a more stable measurement result than a spoke-type rim.
Table-1 test data of rolling resistance for different heating driving durations
In the present embodiment, separation is employedBy measuring parasitic loss resistance F p1 . The separation method refers to reducing the test load of the tire 6 to an energy loss value per unit travel distance measured when the energy loss of the tire 6 is brought close to zero while maintaining the tire 6 rolling at the test speed without slipping. Measuring parasitic loss resistance F p1 In order to make the rolling resistance of the tyre negligible, the test load of the tyre 6 should be reduced as much as possible so that the test tyre 6 remains rotating at the same speed as the drum 3, while both do not slip. Measuring parasitic loss resistance F of rolling resistance test device p1 The method specifically comprises the following steps:
(3.1) maintaining the rotational speed of the drum 3 and the tire 6 unchanged, reducing the test load of the tire 6 to the separation limit load so that the contact surface of the tire 6 and the drum 3 maintains the same linear velocity; the value range of the separation limit load is 50N to 100N; in a preferred embodiment, the split limit load takes a value of 100N;
(3.2) measuring input Torque T of Drum 3 t ，
(3.3) calculating the parasitic loss resistance F of the Rolling resistance test device p1 The calculation formula is as follows:
F p1 ＝T t /R
wherein:
F p1 an additional loss resistance in newtons (N) for the rolling resistance testing device;
T t the input torque of the rotary drum is measured in the process of measuring the loss resistance of accessories, wherein the unit is the cow meter (N.m);
r is the radius of the drum in meters (m).
In the process of measuring the input torque T of the drum 3, it is necessary to measure the laboratory temperature T amb Since the laboratory temperature is within 25.+ -. 3 ℃, it is necessary to calculate the rolling resistance F r And (5) performing correction. The correction formula is as follows:
F r25 ＝F r [1+Kt(t amb -25)]
wherein:
F r25 for the purpose of markingRolling resistance of the tire at quasi-ambient temperature (25 ℃) in newtons (N);
F r to be at laboratory ambient temperature (t amb ) Lower tire rolling resistance in newtons (N);
t amb is the actual temperature of the laboratory in degrees celsius (°c);
kt is the temperature correction coefficient of the rolling resistance of the tire, and Kt is 0.01.
After the rolling resistance of the tire 6 is corrected, the rolling resistance coefficient of the tire can be calculated from this, and the calculation formula is as follows:
C r25 ＝F r25 /L m
wherein:
C r25 the rolling resistance coefficient of the test tire at standard ambient temperature (25 ℃) is expressed in units of newtons/kilonewtons (N/kN);
F r25 rolling resistance of the tire at standard ambient temperature (25 ℃) is in newtons (N);
L m the tire test load is in newtons (N).
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (15)
1. A rolling resistance testing device for testing rolling resistance of a tire of a non-motor vehicle, the rolling resistance testing device comprising a rim, a tire load loading device, and a rim clamp:
the rim is used for being mounted on the inner edge of the tire; a shaft hole is formed in the rotation axis of the rim;
the rim clamp is used for fixing the rim on a rotating shaft of the tire load loading device so that the rim cannot rotate freely; the rim clamp comprises a center shaft substitute and two clamping plates; the two clamping plates are oppositely arranged at two sides of the rim; the middle shaft substitute is rod-shaped; the first end of the middle shaft substitute piece is provided with a limiting part, and the second end of the middle shaft substitute piece passes through the clamping plate and the shaft hole and is coaxially and fixedly connected with the rotating shaft, so that one clamping plate is abutted against the end part of the rotating shaft, and the other clamping plate is tightly attached to the rim under the pushing of the limiting part, thereby realizing the clamping of the rim.
2. The rolling resistance testing device according to claim 1, wherein bearing accommodating portions are provided at both ends of the shaft hole; and a bearing substitute is arranged on one side, attached to the rim, of the clamping plate, and the bearing substitute is accommodated in the bearing accommodating part.
3. The rolling resistance testing device according to claim 1, wherein the clamping plate is provided with a through hole for the middle shaft substitute to pass through, and the diameter of the limiting part of the middle shaft substitute is larger than the diameter of the through hole of the clamping plate.
4. A rolling resistance testing device according to claim 1, further comprising a drum, the circumferential surface of which is adapted to contact the outer rim of the tyre to simulate a road surface, and drum driving means; the rotary drum driving device is connected with a supporting shaft of the rotary drum to drive the rotary drum to rotate; a torque sensor is arranged between the support shaft and the rotary drum driving device; the torque sensor is used for measuring the input torque of the rotary drum; the tire load loading device is used for pushing the rim so that the tire on the rim acts on the circumferential surface of the rotary drum to simulate the load of the tire.
5. The rolling resistance testing device according to claim 4, further comprising a control module electrically connected to the tire load loading device, the drum driving device, and the torque sensor, respectively.
6. A rolling resistance testing device according to claim 4, wherein said rotary shaft of said tire loading device is disposed in parallel with a support shaft of said drum.
7. A rolling resistance testing device according to claim 1, wherein the rim comprises an integral rim.
8. A rolling resistance testing method involving the rolling resistance testing device according to any one of claims 1 to 7, comprising the steps of:
(1) Mounting the tire on a rim, and fixedly mounting the rim on the end of a rotating shaft of the tire load loading device through a rim clamp;
(2) Driving the drum to rotate so that the drum acts on the tire to drive the rim to rotate, and measuring the input torque T of the drum under the condition of preset parameters;
(3) Measuring parasitic loss resistance F of the rolling resistance testing device p1 ；
(4) Calculating the rolling resistance F of said tyre under the condition of predetermined parameters r The method comprises the steps of carrying out a first treatment on the surface of the Rolling resistance F r The calculation formula of (2) is as follows:
F r ＝T/R-F p1
wherein F is r T is the input torque of the drum, R is the radius of the drum, F is the rolling resistance of the tire p1 And (3) the additional loss resistance of the rolling resistance testing device.
9. A rolling resistance testing method according to claim 8, wherein said tire is mounted on said rim prior to measuring said tire and is left for more than 24 hours in an environment of 25±3 ℃.
10. A method of testing rolling resistance according to claim 8, wherein said parameter conditions include a test speed and/or a test load of said tyre.
11. A rolling resistance testing method according to claim 10, wherein,
the tire comprises a bicycle inflation-free tire, and the parameter conditions adopted when the bicycle inflation-free tire is tested comprise: the test speed is 15-25Km/h, and the test load is 60-75Kg;
the tire comprises a booster vehicle inflation-free tire, and when the booster vehicle inflation-free tire is tested, the parameter conditions adopted comprise: the test speed is 20-40Km/h, and the test load is 60-85Kg.
12. A method of testing rolling resistance according to claim 10, characterized in that the measuring of the input torque T of the drum under predetermined parameters comprises in particular the steps of:
(1) Applying a predetermined test load to the tire using a tire load loading device; the rotating speed of the rotary drum is regulated through a rotary drum driving device, so that the rotating speed of the tire reaches a preset test speed;
(2) Driving the tire and the rim to continuously rotate for a preset time so as to simulate the temperature rising running process of the tire;
(3) The input torque T of the drum is measured with steady conditions of the parameters.
13. The method of claim 12, wherein the tire and rim are driven to rotate for a predetermined period of time greater than or equal to 30 minutes.
14. The method for testing rolling resistance according to claim 12, wherein the parasitic loss resistance of the rolling resistance testing device is measured by a separation methodF p1 Measuring the parasitic loss resistance F of the rolling resistance test device p1 The method specifically comprises the following steps:
(1) Maintaining the rotational speed of the drum, reducing the test load of the tire to a separation limit load so that the contact surface of the tire and the drum maintains the same linear velocity;
(2) Measuring input torque T of the drum t ，
(3) Calculating the parasitic loss resistance F of the rolling resistance testing device p1 The calculation formula is as follows:
F p1 ＝T t /R
wherein F is p1 For additional loss resistance of the rolling resistance testing device, T t To test the input torque of the drum during the loss of resistance of the accessory, R is the radius of the drum.
15. The method of claim 14, wherein the separation limit load is 50N-100N.
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| CN114112360A (en) * | 2021-11-24 | 2022-03-01 | 惠州市德赛西威汽车电子股份有限公司 | Rolling and pull rod durability testing device and using method |
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