CN108844487B

CN108844487B - Formula car wheel toe-in angle measuring device

Info

Publication number: CN108844487B
Application number: CN201810414987.XA
Authority: CN
Inventors: 乔冠北; 程帅; 王佳杰; 郑荣良
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2018-05-03
Filing date: 2018-05-03
Publication date: 2020-06-09
Anticipated expiration: 2038-05-03
Also published as: CN108844487A

Abstract

The invention discloses a device for measuring a toe-in angle of a wheel of an equation car, which relates to the field of vehicle detection and positioning, and comprises a rack, a wheel fixing base, an automatic positioning and clamping device, a horizontal calibrator, a laser emitter and an adjustable graduated scale with a slide rail; the measuring device is used for installing the wheel fixing base provided with the laser emitter on the tire to be measured, and the automatic positioning device can accurately position the laser emitter at the center of the wheel; the adjustable graduated scale with the slide rail is arranged on a steel pipe at the upper part of the frame leg bin, and the measuring and positioning are carried out for the toe-in angles of the wheels of the formula racing car with different wheel pitches by adjusting the graduated scale on the slide rail. The device can carry out measurement without changing the arrangement form of the suspension, and simultaneously realize the measurement of the toe angle of the wheels of the formula car with different track widths. Compared with the prior art, the invention only measures the wheel of the 1/4 suspension and has the advantages of simple, accurate and efficient measurement process.

Description

Formula car wheel toe-in angle measuring device

Technical Field

The invention relates to the field of vehicle four-wheel positioning parameters, in particular to a device for measuring a toe-in angle of a wheel of an equation car.

Background

With the rapid advance of the automobile industry in China, various racing car sports events are continuously developed and popularized. The Chinese college student formula automobile competition is a formula automobile designing and manufacturing competition participated in by college students in a group. During the design and manufacture of formula cars, the wheel alignment parameters play a crucial role in vehicle handling stability. The wheel alignment parameters include a wheel camber angle, a wheel toe angle, a kingpin caster angle, and a kingpin caster angle.

In order to ensure the stable straight-line running of the automobile, the steering wheel is required to have an automatic aligning function, the aligning function is ensured by the positioning parameters of the steering wheel, and the toe-in angle is one of the positioning parameters. In order to eliminate the adverse effect caused by the camber of the wheel, when the wheel is installed, the central plane of the front wheel of the vehicle is not parallel, and the included angle between the plane of the wheel and the advancing direction of the vehicle body is a toe-in angle. For an equation car focusing on curve performance, the toe angle is usually in the range of 0 ° to 2 °. The toe angle of the wheels can be adjusted by adjusting the length of the tie rod. In order to ensure the driving stability and steering convenience of racing cars and improve the durability of tires in use, the toe angle of racing tires needs to be measured and corrected periodically.

The existing four-wheel aligner is only suitable for common passenger vehicles and commercial vehicles, is large in size, high in price and complex in operation, and is not suitable for formula racing. In the development process of the formula car, the four-wheel positioning parameters of the whole car do not need to be measured and corrected, and only the 1/4 suspension wheel or the 1/2 suspension wheel needs to be corrected.

The invention effectively solves the problems of difficult measurement, inconvenient measurement, higher cost, low efficiency and the like of the toe-in angle of the wheel of the formula car at present.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the device for measuring the toe-in angle of the wheel of the formula racing car, which realizes the quick and accurate measurement of the toe-in angle of the wheel of the formula racing car, further ensures the control stability and the steering portability of the racing car and effectively prevents the negative influence caused by inaccurate wheel positioning.

The invention realizes the technical purpose through the following technical means:

a measuring device for the toe-in angle of a wheel of an equation car comprises a rack, a wheel fixing base, an automatic positioning and clamping device, a laser emitter and an adjustable graduated scale with a slide rail; the frame is arranged on the frame steel pipe; the wheel fixing base is arranged at the center of a wheel; the wheel fixing base is of a U-shaped structure; automatic positioning and clamping devices are arranged at two ends of the wheel fixing base; the automatic positioning device positions and clamps the wheel fixing base at the axial central position of the measured wheel, the laser transmitter is arranged at the central position of the wheel fixing base through a height adjusting rod, and the vertical height of the laser transmitter is adjusted through the height adjusting rod; after the laser transmitter is started, laser beams irradiate the adjustable graduated scale with the slide rail, and the scale value of an irradiation point is the toe-in angle of the wheel.

Furthermore, the first horizontal calibration instrument and the second horizontal calibration instrument are respectively installed on the rack and the wheel fixing base and used for horizontal positioning of the rack and the wheel fixing base, and accuracy of measurement is guaranteed.

Furthermore, the adjustable graduated scale with the slide rail is arranged at the tail end of the rack and used for reading the toe angle of the wheels of the formula racing car with different wheel pitches.

Furthermore, both ends of the frame are positioned and clamped by a positioning pipe and a locking bolt; and the frame is provided with a leveling bolt, and the frame is ensured to be in a horizontal position through the leveling bolt.

Further, the wheel fixing base is placed at 1/4 suspension.

Further, the wheel fixing base limits 5 degrees of freedom of the laser transmitter, and ensures that the laser transmitter is in a correct working position.

Further, the wheel fixing base is positioned and clamped at the radial center position of the measured wheel by the fixing disc and the locking bolt; the automatic positioning and clamping device is provided with a spring resetting mechanism, and the spring resetting mechanism can automatically position and clamp the laser transmitter at the axial center position of the wheel to be measured.

Furthermore, the precision grade of the first horizontal calibrator and the second horizontal calibrator is 0.05 mm/m.

Furthermore, the power of the laser transmitter is 200mW, the energy consumption is low, the light beam is clear, and the recognition rate is high.

Furthermore, the adjustable graduated scale with the slide rail can move left and right along the slide rail, so that the measurement of toe angles in front of the wheels of the formula racing car with different wheel pitches is realized, the adjustable range is wide, and the measurement range is large.

Has the advantages that:

1. the method realizes the quick and accurate measurement of the toe angle of the wheel of the opposite square race car, further ensures the control stability and the steering portability of the race car, and effectively prevents the negative influence caused by inaccurate wheel positioning.

2. The automatic positioning and clamping device is provided with a spring resetting mechanism which can automatically position and clamp the laser transmitter at the axial center position of the wheel to be measured.

3. The height of the machine frame is adjustable, and the machine frame is ensured to be in a horizontal position through the adjusting bolt.

4. The horizontal calibration instrument is arranged on the rack and the wheel fixing base, so that the horizontal positioning of the rack and the wheel fixing base is realized, and the measuring accuracy is ensured.

Drawings

FIG. 1 is a schematic view of the installation position and measurement method of the toe-angle measurement device for the wheels of the formula racing car according to the present invention;

FIG. 2 is a right side view of the wheel securing base and laser transmitter of FIG. 1 in accordance with the present invention;

fig. 3 is a front view of the frame and the adjustable scale with the slide rail of fig. 1 according to the present invention.

The reference numbers are as follows:

the method comprises the following steps of 1-measuring wheels, 2-vehicle frame steel pipes, 3-vehicle wheel fixing bases, 4-automatic positioning and clamping devices, 5-locking bolts, 6-fixing discs, 7-first horizontal proofreading instrument, 8-second horizontal proofreading instrument, 9-laser emitter, 10-height adjusting rod, 11-positioning pipe, 12-locking bolts, 13-height adjusting rod, 14-machine frame and 15-adjustable graduated scale with slide rails.

Detailed Description

For better illustrating the objects and advantages of the present invention, the following detailed description of the present invention is provided by way of example with reference to the accompanying drawings.

The device for measuring the toe-in angle of the wheel of the formula car comprises a rack 14, a wheel fixing base 3, an automatic positioning and clamping device 4, a laser emitter 9 and an adjustable graduated scale 15 with a slide rail; the frame 14 is arranged on the frame steel pipe 2; the wheel fixing base 3 is arranged at the center of a wheel; the wheel fixing base 3 is of a U-shaped structure; the two ends of the wheel fixing base 3 are provided with automatic positioning and clamping devices 4; the automatic positioning device 4 positions and clamps the wheel fixing base 3 at the axial central position of the measured wheel 1, the laser emitter 9 is arranged at the central position of the wheel fixing base 3 through the height adjusting rod 10, and the vertical height of the laser emitter 9 is adjusted through the height adjusting rod 10; after the laser transmitter 9 is started, the laser beam irradiates the adjustable graduated scale 15 with the slide rail, and the scale value of the irradiated point is the toe-in angle of the wheel.

The first horizontal calibration instrument 7 and the second horizontal calibration instrument 8 are respectively installed on the rack 14 and the wheel fixing base 3 and used for horizontal positioning of the rack 14 and the wheel fixing base 3, and accuracy of measurement is guaranteed. The adjustable graduated scale 15 with the slide rail is installed at the tail end of the rack 14 and used for reading the toe angle of the wheels of the formula racing car with different wheel pitches. Both ends of the frame 14 are positioned and clamped by a positioning pipe 11 and a locking bolt 12; and the frame 14 is provided with leveling bolts, and the frame 14 is ensured to be in a horizontal position through the leveling bolts. The wheel securing base 3 is placed at 1/4 suspension. The wheel mounting base 3 limits the 5 degrees of freedom of the laser transmitter 9 to ensure that the laser transmitter 9 is in the correct working position. The wheel fixing base 3 is positioned and clamped at the radial center position of the measured wheel 1 by the fixing disc 6 and the locking bolt 5; the automatic positioning and clamping device 4 is provided with a spring resetting mechanism which can automatically position and clamp the laser transmitter 9 at the axial center position of the wheel to be measured. The accuracy grade of the first horizontal proofreading instrument 7 and the second horizontal proofreading instrument 8 is 0.05 mm/m. The laser transmitter 9 has a power of 200 mW. The adjustable graduated scale 15 with the slide rail can move left and right along the slide rail, and measurement of toe angles of the wheels of the formula racing cars with different wheel pitches is achieved.

Referring to the attached drawing 1, the measuring mechanism comprises a measured wheel 1, a frame steel pipe 2, a wheel fixing base 3, an automatic positioning and clamping device 4, a locking bolt 5, a fixed disc 6, a first level corrector 7, a laser emitter 9, a height adjusting rod 10, a positioning pipe 11, a locking bolt 12, a height adjusting rod 13, a frame 14 and an adjustable graduated scale 15 with a slide rail.

When the locking bolt 12 is used, the locking bolts 12 on two sides are simultaneously rotated in the counterclockwise direction to be screwed to be loosest as shown in the combined drawings 1 and 3; clamping the positioning pipe 11 on the frame steel pipe 2; meanwhile, the locking bolts 12 on the two sides are screwed clockwise until the locking bolts 12 clamp the steel pipes 2 on the upper parts of the frame leg bins, and the frame 14 does not shake obviously; adjusting the height adjusting rod 13 to make the rack 14 at a proper height; the first level corrector 7 is observed to confirm that the housing 14 is in the horizontal position.

The working process is as follows:

when the steering wheel turning device is used, the steering wheel is firstly returned to the central area, and the turning angle of the steering wheel is ensured to be 0 degree; rotating the locking bolt 5 in the anticlockwise direction to screw the fixed disc 6 to be loosest; placing the wheel fixing base 3 on the wheel 1 to be measured, pulling the automatic positioning and clamping device 4 open and clamping the wheel 1 to be measured; at the moment, the wheel fixing base 3 is automatically positioned at the axial center position of the wheel 1 to be measured; simultaneously, the locking bolts 5 on the two sides of the tire are screwed clockwise until the fixed disk 6 slightly clamps the wheel 1 to be measured; observing the second horizontal calibrator 8 to confirm that the wheel fixing base 3 is in a horizontal position; measuring the shortest distance between the height adjusting rod 10 and the center line of the frame and recording as m; opening the laser emitter 9 and adjusting the height adjusting rod 10; the light beam emitted by the laser emitter 9 irradiates the center position of the adjustable graduated scale 15 with the slide rail; aligning the black triangle on the adjustable scale 15 to the number m on the frame 14; and observing the angle value on the adjustable graduated scale 15 with the slide rail, namely the angle of the front toe angle of the wheel to be measured.

The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like within the spirit and principle of the present invention should be included in the scope of the present invention.

While embodiments of the present invention have been shown and described, it will be appreciated that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.

Claims

1. The device for measuring the toe-in angle of the wheel of the formula car is characterized by comprising a rack (14), a wheel fixing base (3), an automatic positioning and clamping device (4), a laser emitter (9) and an adjustable graduated scale (15) with a slide rail; the frame (14) is arranged on the frame steel pipe (2); the wheel fixing base (3) is arranged at the center of a wheel; the wheel fixing base (3) is of a U-shaped structure; automatic positioning and clamping devices (4) are arranged at two ends of the wheel fixing base (3); the automatic positioning and clamping device (4) positions and clamps the wheel fixing base (3) at the axial central position of the measured wheel (1), the laser emitter (9) is arranged at the central position of the wheel fixing base (3) through a height adjusting rod (10), and the vertical height of the laser emitter (9) is adjusted through the height adjusting rod (10); after a laser transmitter (9) is started, a laser beam irradiates an adjustable graduated scale (15) with a slide rail, and the scale value of an irradiated point is the toe-in angle of the wheel; the first horizontal calibrator (7) and the second horizontal calibrator (8) are respectively arranged on the rack (14) and the wheel fixing base (3) and are used for horizontally positioning the rack (14) and the wheel fixing base (3) so as to ensure the accuracy of measurement; the wheel fixing base (3) is positioned and clamped at the radial center position of the measured wheel (1) by the fixing disc (6) and the locking bolt (5); the automatic positioning and clamping device (4) is provided with a spring resetting mechanism, and the spring resetting mechanism can automatically position and clamp the laser transmitter (9) at the axial center position of the wheel to be measured.

2. The device for measuring the toe angle of the wheel of the formula racing car as claimed in claim 1, wherein the adjustable graduated scale (15) with the slide rails is mounted at the tail end of the rack (14) and is used for reading the toe angle of the wheel of the formula racing car with different track pitches.

3. The device for measuring the toe angle of the wheel of the formula racing car as claimed in claim 1, wherein both ends of the frame (14) are positioned and clamped by a positioning tube (11) and a locking bolt (12); and the frame (14) is provided with a leveling bolt, and the frame (14) is ensured to be in a horizontal position through the leveling bolt.

4. The apparatus for measuring toe angle of formula racing wheel of claim 1, wherein the wheel securing base (3) is placed at 1/4 suspension.

5. An apparatus as claimed in claim 1, wherein the wheel mounting base (3) constrains the laser transmitter (9) in 5 degrees of freedom to ensure that the laser transmitter (9) is in the correct operating position.

6. An apparatus as claimed in claim 1, wherein the accuracy of the first horizontal calibrator (7) and the second horizontal calibrator (8) is of the order of 0.05 mm/m.

7. The apparatus for measuring toe angle of formula racing vehicle wheel of claim 1, wherein the power of the laser transmitter (9) is 200 mW.

8. The device for measuring the toe angle of the wheel of the formula racing car as claimed in claim 1, wherein the adjustable graduated scale (15) with the slide rail can move left and right along the slide rail, so that the toe angle of the wheel of the formula racing car with different track pitches can be measured.