CN103033372A - Wheel traction and adhesion property testing device with slip ratio controllable - Google Patents

Abstract

Disclosed is a wheel traction and adhesion property testing device with slip ratio controllable. A trolley which is provided with a to-be-tested wheel is connected on a sliding support, and the sliding support moves along a track. An engine drives a wheel axle to enable the wheel to rotate with certain revolving speed. A driving chain wheel which is installed on the wheel axle and rotates synchronously together with the wheel drives a driven chain wheel to rotate. The driven chain wheel drives a drum shaft to rotate so as to drive a coaxial mooring line winding drum to release a traction mooring line, and the release rate of the mooring line is the forward linear speed of the wheel. A difference is reserved between instantaneous speed of the wheel at an earth point and the release rate of the mooring line, and the speed difference determines the slip ratio of the wheel. An adjusting chain wheel pair can change the speed difference of a rotation linear speed and the forward linear speed of the wheel.

Description

The wheel traction that a kind of slippage rate is controlled and adhesion property proving installation

Technical field

The present invention relates to a kind of can mandatory control wheel slip rate and test wheel (comprising tire, impeller, crawler belt, paddy field wheel) under specific slippage rate state traction and the device of adhesion property, be the quantitative specific slippage rate and the traction that can provide and the test platform of adhesive ability Relations Among that under the soft terrain condition, occur of dissimilar wheels.

Background technology

At present, be used for that wheel under indoor and the field condition adheres to and the equipment of hauling ability test and evaluation is mainly realized in the mode that tractor or towing vehicle articulate tested wheel, keep constant wheel slip rate but this type of test macro is difficult under the larger outdoor soft terrain state of Spatial Variability, thereby the dynamic change of the draw bar load of surveying for accurate description has brought difficulty.For the intrinsic spatial variability state of the physical-mechanical properties of field condition soft terrain, when carrying out the wheel performance test, need to adopt the method for the constant slippage rate of control, can obtain like this vehicle adhering to and tractive force performance performance and performance at specific slippage rate state.

Summary of the invention

In order to realize in the test process the accurate control to the wheel slip rate, the invention provides a kind of the adjusting controls the vehicle slippage rate and keeps the constant device of slippage rate, thereby it is invariable to maintain in the test process predefined wheel slip rate, guarantees that the wheel that test macro can obtain under this slippage rate condition adheres to and tractive force performance performance.

The technical solution adopted for the present invention to solve the technical problems is: tested wheel is installed on the test chassis, the test chassis through chain connection to travelling carriage, travelling carriage slides along horizontal rail, and the control of wheel slip rate is realized by the acting in conjunction of engine and pull-cord.Engine rotates via the speed reduction unit tire on the drive wheels, one group drive sprocket and the tire coaxial with tire rotate synchronously, another group driven sprocket is installed on the drum shaft, drive sprocket set is rotated by chain drive driven chain wheels, same rotating shaft at the driven chain wheels is provided with a cable reel, cable reel and driven chain wheels synchronous rotating are moving, and the rotation of cable reel discharges hawser wound thereon, thereby control test chassis moves ahead with specific speed.The test chassis that cable reel the discharges hawser control linear velocity of advancing drives wheel with engine via speed reduction unit have a difference between the rotational line speed that earth point forms, and this difference is exactly the wheel slip rate of controlling.The adjustment of slippage rate realizes by the syntagmatic that changes between drive sprocket set and the driven chain wheels.

Advantage of the present invention is, the velocity of rotation control of wheel is overlapped winding machines by two respectively with the pace control of wheel, the velocity of rotation of wheel is by engine and speed reduction unit control, and the pace of wheel is controlled by cable reel, but two cover control gears are realized via the cooperation between the auxiliary chain wheel group between tire axle and the spool shaft again, can regulate slippage rate and keep slippage rate constant in a test process by the mated condition of adjusting chain wheel set.

Description of drawings

The present invention is further described below in conjunction with accompanying drawing.

Fig. 1 is the front view of invention.

Among the figure: 1. guide rail, 2. wheel, 3. chassis, 4. travelling carriage, 6. pulling force sensor, 10. wheel box, 13. rail bracketses, 16. articulated linkage, 17. engines.

Fig. 2 is vertical view of the present invention (not containing vehicle body).

Among the figure: 1. guide rail, 2. wheel, 4. travelling carriage, 5. pull-cord, 6. pulling force sensor, 7. drive sprocket set, 8. driven chain wheels, 9. cable reel, 11. chains, 12. belt pulleys, 14, tire axle, 15. spool shaft, 16. articulated linkage.

Embodiment:

Accompanying drawing discloses concrete structure of the invention process and use-pattern thereof without limitation, and the invention will be further described below in conjunction with accompanying drawing.By Fig. 1 and Fig. 2 as seen: the present invention includes horizontal guide rail (1), travelling carriage (4) along the guide rail slip, be connected to the test chassis (3) on the travelling carriage (4), be installed in test wheel (2) and engine (17) and wheel box (10) on the chassis, one group of drive sprocket (7) rotates synchronously with wheel (2), another group driven sprocket (8) is installed on the spool shaft (15), spool shaft (15) drives cable reel (9) and rotates, decontrol pull-cord (5), order test chassis (3) is advanced forward, wheel (2) is decontroled the linear velocity of hawser (5) greater than cable reel (9) in the rotational line speed of earth point, the difference of two speed is exactly the movement velocity that transfers of wheel, this speed different adjustment by the driven chain wheels (8) on the drive sprocket set (7) on the tire axle (14) and the spool shaft (15) of trackslipping.

Because pull-cord (5) is connected on the rail brackets (13) via a pulling force sensor (6), the tractive force of wheel performance can be by power sensor (6) sensing.

Engine (17) on the chassis in test process (3) drives vehicle wheel rotation via wheel box (10) and the belt pulley (12) that is installed on the axletree (14), cable reel (9) is decontroled pull-cord (5) makes chassis move forward, guide rail (1) plays guide effect with travelling carriage (4), order test chassis is along the guide rail traveling priority, the articulated linkage (16) that connects chassis allows chassis suitably to rotate around pin joint, satisfies the good contact of wheel and ground in the test process.

When testing, at first set the slippage rate of wheel, select corresponding drive sprocket and driven sprocket according to slippage rate, the turning radius of slippage rate, the wheel turning radius, the cable reel turning radius and drive sprocket and driven sprocket satisfies following relation:

Formula:

$s=\frac{v1-v2}{v1}=1-\frac{\mathrm{<figure-callout\; id="4"\; label="r"\; filenames="HSA00000586793200011.png,HSA00000586793200021.png"\; state="\{\{state\}\}">r</figure-callout>}4*r2}{r1*r3}$

Wherein s is slippage rate.

v ₁Be tire earth point linear velocity.

v ₂For hawser is decontroled speed.

r ₁Be the wheel turning radius.

r ₂Be the drive sprocket turning radius.

r ₃The turning radius for driven sprocket.

r ₄Be the cable reel turning radius.

Claims (5)

1. the present invention relates to a kind of wheel of controlling under the slippage rate condition adheres to and the hauling ability proving installation, comprise horizontal guide rail, travelling carriage along the guide rail slip, be connected to the test chassis on the travelling carriage, be installed in test wheel and engine and wheel box on the chassis, be installed in one group of drive sprocket on the tire axle, be installed in the spool shaft on the test chassis, one group of driven sprocket on the spool shaft and cable reel, the pull-cord that is wound on the cable reel is connected on the rail brackets via a pulling force sensor.

2. the wheel under the control slippage rate condition according to claim 1 adheres to and the hauling ability proving installation, and the slippage rate control that it is characterized in that wheel is by the acting in conjunction realization along two actions of movement of guide rail direction of the chassis of the rotational motion of wheel and pull-cord control.

3. wheel slip rate control according to claim 2, it is characterized in that engine is via the belt wheel on the wheel box driving axletree, make wheel with fixing rotational speed, the drive sprocket set that is installed on the axletree drives the driven chain wheels rotation that is installed on the spool shaft, driven sprocket drives the cable reel coaxial with it and rotates, relieving is wound on the hawser on the cable reel, and the speed that hawser unclasps is exactly the speed that the test chassis advances along guide rail.

4. the array mode of drive sprocket set according to claim 3 and driven chain wheels is adjustable, according to the selected corresponding chain wheel pair of the slippage rate of test request, thereby guarantees that slippage rate remains unchanged in the wheel for testing process.

5. wheel according to claim 1 adheres to and the hauling ability proving installation, the pull-cord that it is characterized in that being wound on the cable reel is connected on the track support by a pulling force sensor, pulling force sensor is connected on the test computer, and the draw bar load of wheel for testing process can show and storage for test computer.

Images