Portable toe-in measuring device

Abstract

The invention discloses a portable toe-in measuring device which is structurally characterized in that a rim fixture is mounted at the rotating center position of the outer side of a wheel, and a laser transmitter and a laser receiver are mounted on the rim fixture; the laser transmitters are installed on the wheels needing toe-in testing, the wheels needing toe-in testing comprise the left front wheel and the right front wheel, the laser transmitters are installed on the outer sides of the left front wheel and the right front wheel through the rim clamp, and laser beams are adjusted to irradiate the laser receivers in the direction of the rear wheels of the automobile; the laser receivers are installed on the other wheel on the same side as the wheel needing to be tested and comprise the left rear wheel and the right rear wheel, the laser receivers are installed on the outer sides of the left rear wheel and the right rear wheel through the rim clamp, the light receiving faces of the laser receivers are adjusted to face the laser transmitter, and received light position signals are sent to the toe-in displayer; the toe-in display is connected to the laser receivers of the left rear wheel and the right rear wheel in a wireless communication mode and displays the currently measured toe-in value in real time. The method is easy to realize measurement and high in precision.

Description

Technical Field

[0001] The invention belongs to the technical field of wheeled vehicle chassis toe-in measurement and relates to a portable toe-in measurement device. Background Art

[0002] At present, the toe measurement of automobiles mainly includes 3D camera measurement and direct measurement with a toe measuring ruler. The 3D camera measurement method uses a 3D camera to shoot a target plate fixed on the rim, and records the spatial motion trajectory of the calibrated points on the target plate through the rotation of the wheel. The toe value of the vehicle can be obtained intuitively through computer calculation. The toe measuring ruler is a special caliper that directly measures the distance between the front and rear end points of the wheel, and the toe value of the vehicle can be obtained through calculation.

[0003] The toe-in measuring devices currently on the market are mainly 3D cameras and toe-in measuring rulers. The 3D camera measurement method requires a fixed indoor site, and the camera must be calibrated in advance. At the same time, it needs to be used with a lift or turntable to achieve relative movement of the wheels. The measurement speed is fast and the operation is simple. However, it uses many components, and the installation and debugging process is relatively complicated. It is not suitable for mobile use. In addition, the 3D camera is sensitive to strong light when illuminating the target plate, so it is not suitable for outdoor use. The toe-in measuring ruler is small in size and light in weight. However, the operation and use method is relatively complicated, requiring certain training, and the measurement accuracy is low, the measurement speed is slow, and it is not convenient for real-time adjustment, which is difficult to use.

[0004] Due to the harsh operating environment of the automobile chassis, encountering rocks or potholes during racing may cause the vehicle chassis to deform, and various chassis parameters including toe-in will become invalid. Too much toe-in will affect driving stability, while too little toe-in will affect the vehicle's handling. Both too much and too little toe-in will accelerate the wear of the vehicle's tires, seriously affecting driving safety. Summary of the invention

[0005] (I) Purpose of the invention

[0006] The purpose of the present invention is to provide a portable toe-in measuring device for quickly measuring and adjusting the toe-in of a wheeled vehicle in a field environment. When the vehicle deviates in the field, the toe-in can be measured quickly and accurately, so as to facilitate adjusting the toe-in to an appropriate range. At the same time, the portable toe-in measuring device is small in size and light in weight, easy to carry, simple to use, and has strong environmental adaptability.

[0007] (II) Technical solution

[0008] In order to solve the above technical problems, the present invention provides a portable toe-in measuring device, which comprises: a rim fixture, a laser transmitter, a laser receiver, and a toe-in display; the rim fixture is installed at the rotation center position of the outer side of the wheel, and has a positioning hole on it, which is used to install the laser transmitter and the laser receiver on the vehicle; the laser transmitter is installed on the wheel to be tested for toe-in, the wheel to be tested for toe-in is selected from the left front wheel and the right front wheel, the laser transmitter is installed on the outer side of the left front wheel and the right front wheel through the rim fixture, and the laser beam is adjusted to shine toward the laser receiver in the direction of the rear wheel of the vehicle; the laser receiver is installed on the other wheel on the same side of the wheel to be tested, which is the left rear wheel and the right rear wheel, the laser receiver is installed on the outer side of the left rear wheel and the right rear wheel through the rim fixture, the light-receiving surface of the laser receiver is adjusted to face the laser transmitter, and the received light position signal is sent to the toe-in display; the toe-in display is connected to the laser receivers of the left rear wheel and the right rear wheel by wireless communication, and the currently measured toe-in value is displayed in real time.

[0009] The toe-in display is held by the user, and the user adjusts the toe-in value to a suitable range according to the prompt.

[0010] The axis of the positioning hole of the rim fixture is located at the rotation center of the wheel, and the axis is perpendicular to the diameter direction of the wheel.

[0011] The specifications of the rim fixture are matched with the wheel size, and are locked by the original tire fixing bolts. The light emitted by the laser transmitter is parallel to the rim.

[0012] Among them, the laser transmitter is installed on the rim fixture through a connecting rod. The laser uses a visible light wavelength, refracts a line of laser through a prism, and is powered by a rechargeable battery.

[0013] Among them, the laser receiver uses a one-dimensional PSD photoelectric sensor, and the laser receiver is installed on the rear wheel rim with a rim fixture. The photosensitive surface is perpendicular to the rim and faces the laser transmitter. It is used to receive the laser beam emitted by the wheel under test and detect the position of the beam.

[0014] The laser receiver is powered by a rechargeable battery and uses Zigbee wireless communication to communicate with the front beam display.

[0015] Among them, the toe-in display displays the currently measured toe-in value in real time on the screen.

[0016] The laser receiver is powered by a rechargeable battery and uses Zigbee wireless communication to communicate with the laser receiver.

[0017] Among them, when measuring the toe, the distance between the center points of the rear ends of the left and right tires of the front wheels is b, the distance between the center points of the front ends of the left and right tires of the front wheels is a, and the toe value of the front wheels is ba. When the difference is positive, it is positive toe, otherwise it is negative toe.

[0018] (III) Beneficial effects

[0019] In the above technical solution, in order to ensure portability and enable non-professional maintenance personnel to quickly and accurately measure and adjust the toe-in of special vehicles in the field, a quick-install rim bracket is used; the laser transmitter emits a line laser in the visible band to facilitate quick alignment of the laser receiver; all electrical components use rechargeable batteries; wireless communication is used between components; and the toe-in measurement value is displayed on the screen in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a measurement principle diagram of the present invention.

[0021] Figure 2 It is a structural diagram of the wheel rim fixture of the present invention.

[0022] Figure 3 This is a schematic diagram of the installation of the laser receiver of the present invention.

[0023] Figure 4 It is a schematic diagram of the front beam display of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.

[0025] Reference Figures 1 to 4 As shown, the portable toe-in measuring device of this embodiment includes a rim fixture, a laser transmitter, a laser receiver, and a toe-in display; the rim fixture is installed at the rotation center position of the outer side of the wheel, and has a positioning hole on it, which is used to install the laser transmitter and the laser receiver on the vehicle; the laser transmitter is installed on the wheel to be tested for toe-in, and the wheels to be tested for toe-in are selected from the left front wheel and the right front wheel, and the laser transmitter is installed on the outer side of the left front wheel and the right front wheel through the rim fixture, and the laser beam is adjusted to shine on the laser receiver in the direction of the rear wheel of the vehicle; the laser receiver is installed on the other wheel on the same side of the wheel to be tested, which is the left rear wheel and the right rear wheel, and the laser receiver is installed on the outer side of the left rear wheel and the right rear wheel through the rim fixture, and the light-receiving surface of the laser receiver is adjusted to face the laser transmitter, and the received light position signal is sent to the toe-in display; the toe-in display is connected to the laser receivers of the left rear wheel and the right rear wheel using wireless communication, and displays the currently measured toe-in value in real time.

[0026] The toe-in display is held by the user, and the user adjusts the toe-in value to a suitable range according to the prompts.

[0027] The axis of the locating hole of the rim fixture is located at the rotation center of the wheel, and the axis is perpendicular to the diameter direction of the wheel.

[0028] The measurement principle of the toe-in measurement device of this embodiment is:

[0029] Toe-in is the difference between the center point of the rear end of the tire and the center point of the front end of the tire when looking down from the top of the vehicle. If the difference is positive, it is positive toe-in, otherwise it is negative toe-in. Figure 1 The figure shows the position of the tires on a certain car chassis. The distance between the center points of the rear ends of the left and right front tires is b, and the distance between the center points of the front ends of the left and right front tires is a. By definition, the toe value of the front wheel is ba.

[0030] The center point of the left front wheel of the vehicle is A', and the laser is emitted toward the rear wheel. Point C' is the center point of the rear end of the left front tire. A'C' is the radius of the left front wheel center pointing backward. A'B' is drawn backwards parallel to the vehicle axis from A', and it intersects with the perpendicular line C'B' starting from C' and perpendicular to the center line of the vehicle at point B'; point M' is the center point of the front end of the left front tire, N', A', and B' are on the same straight line parallel to the vehicle axis, and M'N' is perpendicular to the vehicle axis; it can be obtained that triangle A'B'C' is congruent to triangle A'N'M', and it can be obtained:

[0031] M'N'=B'C'

[0032] The sum of the vertical distance M'N' between the center point of the front end of the left front tire and the center of the tire and the vertical distance B'C' between the center point of the rear end of the left front tire and the center of the tire is equal to half of the front wheel toe value, that is, (ba) / 2, so:

[0033] B'C'=(ba) / 4

[0034] A laser transmitter is fixed outside the center of the left front wheel of the vehicle. The laser emission point is A, and AA' is the distance from the laser emission point to the center of the left front wheel. Affected by the structures such as the rim fixture and tire thickness, a triangle ABC is constructed with A as the starting point, which is congruent with triangle A'B'C'. AB is parallel to the vehicle axis, and ray AC is parallel to A'C'. AC is the direction of laser emission. A laser receiver is installed outside the center of the left rear wheel. Ray AC is irradiated onto the plane of the laser receiver to obtain the intersection E; the intersection of ray AB and the laser receiving plane is D, and D' is the center point of the left rear wheel. DD'=AA', and the position of point D on the laser receiver can be located. The distance DE between the intersection E of the light and the laser receiver and the intersection D of the parallel line of the vehicle and the laser receiver is measured. The length of BC can be calculated from similar triangles ABC and ADE:

[0035]

[0036] Among them, AC = A'C', which is the tire radius; AD is approximately equal to the wheelbase of the front and rear wheels of the vehicle, and DE is the value that needs to be measured. The toe value of the wheel can be calculated according to the formula.

[0037] In order to quickly fix, the specifications of the rim fixture are matched with the wheel size, and the original tire fixing bolts are used and quickly locked with the handle. The hole in the center of the rim fixture is used to install the laser transmitter and laser receiver. After installation, ensure that the light emitted by the laser transmitter is parallel to the rim. The specific implementation plan is as follows Figure 2 The four locking hand screws are opposite to the mounting bolts of the tire and are fixed to the outside of the rim after being tightened. The center mounting hole can be used to install the laser transmitter or laser receiver.

[0038] The laser transmitter is installed on the wheel rim fixture through a connecting rod. To facilitate manual alignment, the laser uses a visible light wavelength and refracts a line of laser through a prism. It is powered by a rechargeable battery and is not bound by a power cord when in use.

[0039] The laser receiver uses a one-dimensional PSD photoelectric sensor, which is a non-divided device that can convert the position of the light spot on the photosensitive surface into an electrical signal. When the light beam hits the photosensitive surface of the PSD, a current will flow between different electrodes on the same surface. This phenomenon that the voltage or current changes with the position of the light spot is the lateral photoelectric effect of the semiconductor. Use a rim fixture to install the laser receiver on the rear wheel rim. The photosensitive surface is perpendicular to the rim and faces the laser transmitter. It is used to receive the laser beam emitted by the wheel being tested and detect the position of the beam. The laser receiver is powered by a rechargeable battery and uses Zigbee wireless communication to communicate with the toe display. There is no cable restraint when using it.

[0040] The beam-on display can receive the signal from the laser receiver, calculate the current measured beam-on value, and display it on the screen in real time, so that the personnel can adjust the beam-on value according to the screen display value. The laser receiver is powered by a rechargeable battery and communicates with the laser receiver using Zigbee wireless communication, so there is no cable restraint when using it.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A portable toe-in measurement device, characterized in that: include: Rim fixture, laser transmitter, laser receiver, toe-in display; the rim fixture is installed at the rotation center of the outer side of the wheel, and has a positioning hole for installing the laser transmitter and laser receiver on the vehicle; the laser transmitter is installed on the wheel to be tested for toe, which is the left front wheel and the right front wheel. The laser transmitter is installed on the outer side of the left front wheel and the right front wheel through the rim fixture, and the laser receiver is adjusted to shine the laser beam towards the rear wheel of the vehicle; the laser receiver is installed on the other wheel on the same side of the wheel to be tested, which is the left rear wheel and the right rear wheel. The laser receiver is installed on the outer side of the left rear wheel and the right rear wheel through the rim fixture, and the light-receiving surface of the laser receiver is adjusted to face the laser transmitter, and the received light position signal is sent to the toe-in display; the toe-in display is connected to the laser receivers of the left rear wheel and the right rear wheel using wireless communication, and displays the currently measured toe value in real time.

2. The portable toe-in measurement device according to claim 1, characterized in that: The toe-in display is held by the user, and the user adjusts the toe-in value to a suitable range according to the prompts.

3. The portable toe-in measurement device according to claim 2, characterized in that: The axis of the locating hole of the rim fixture is located at the rotation center of the wheel, and the axis is perpendicular to the diameter direction of the wheel.

4. The portable toe-in measurement device according to claim 3, characterized in that: The specifications of the rim fixture are matched with the wheel size and locked by the original tire fixing bolts. The light emitted by the laser transmitter is parallel to the rim.

5. The portable toe-in measurement device according to claim 4, characterized in that: The laser transmitter is installed on the rim fixture through a connecting rod. The laser uses a visible light wavelength, refracts a line of laser through a prism, and is powered by a rechargeable battery.

6. The portable toe-in measurement device according to claim 5, characterized in that: The laser receiver uses a one-dimensional PSD photoelectric sensor. The laser receiver is installed on the rear wheel rim using a rim fixture. The photosensitive surface is perpendicular to the rim and faces the laser transmitter. It is used to receive the laser beam emitted by the wheel being tested and detect the position of the beam.

7. The portable toe-in measurement device according to claim 6, characterized in that: The laser receiver is powered by a rechargeable battery and uses Zigbee wireless communication to communicate with the front beam display.

8. The portable toe-in measurement device according to claim 7, characterized in that: The toe-in display shows the currently measured toe-in value in real time on the screen.

9. The portable toe-in measurement device according to claim 8, characterized in that: The laser receiver is powered by a rechargeable battery and uses Zigbee wireless communication to communicate with the laser receiver.

10. The portable toe-in measurement device according to claim 9, characterized in that: When measuring toe-in, the distance between the center points of the rear ends of the left and right front tires is b, and the distance between the center points of the front ends of the left and right front tires is a. The toe-in value of the front wheels is ba. When the difference is positive, it is positive toe-in, otherwise it is negative toe-in.

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