Drive-by-wire chassis tire rotation angle measuring device

Abstract

The invention belongs to the technical field of intelligent driving vehicle parts, and discloses a drive-by-wire chassis tire rotation angle measuring device, which comprises a fixing mechanism, a measuring mechanism and an angle adjusting mechanism, and is characterized in that the fixing mechanism comprises a rotating handle, an adjusting gear, a gear ring, a pinion, a ball screw, a fixing frame, a clamping jaw, a cover plate, a dial and a rear cover plate; and the firm clamping of the tire rim is realized. The measuring mechanism utilizes a horizontal rotating bracket, a clamping device, a laser pen and a spring, and ensures that the laser pen emits a light beam in the horizontal direction by adjusting the angle of the horizontal rotating bracket; the angle adjusting mechanism adjusts the emission angle of the laser pen by rotating the horizontal rotating support and adjusts the direction according to the dial. In addition, the device further comprises a displacement measuring device which is used for measuring the left-right moving distance of the irradiation point of the laser pen on the measuring plane in real time and calculating the rotating angles of the left wheel and the right wheel through a trigonometric function, and the measuring device provides an accurate data basis for debugging of intelligent driving.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent driving vehicle parts, and in particular relates to a device for measuring the tire turning angle of an intelligent driving wire-controlled chassis. Background Art

[0002] As electric vehicle driverless and intelligent driving technologies are booming, the market demand for diversified and customized driverless drive-by-wire chassis is exploding. As one of the core elements of intelligent driving control systems, chassis steering wheel angle feedback is crucial for accurate measurement. Each vehicle model must have actual test data that corresponds to the steering gear angle input and steering wheel angle output. However, the measurement equipment currently on the market is not fully compatible with existing drive-by-wire chassis. The specifications of drive-by-wire chassis range from 500kg, 1000kg, 2000kg, and 3000kg according to the load capacity. The vehicle specifications span a wide range, and customized special equipment costs tens of thousands or even hundreds of thousands of yuan. A special test space must be preset, which cannot meet current needs. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the background technology, and provides a measuring device for measuring the tire turning angle of an unmanned drive-by-wire chassis. The technical solution adopted is: a wire-controlled chassis tire turning angle measuring device, the measuring device is divided into symmetrical components installed on left and right wheels, each component includes a fixing mechanism, an angle adjustment mechanism and a measuring mechanism; the fixing mechanism is used to fix the measuring device on the rim, the angle adjustment mechanism connects the fixing mechanism and the measuring mechanism, and the angle adjustment mechanism includes a spirit level and an angle-adjustable connecting piece.

[0004] Further, the fixing mechanism includes a rotating handle, an adjusting gear, a gear ring, a pinion, a ball screw, a fixing frame, a clamping claw, a cover plate, a dial and a rear cover plate; the adjusting gear is arranged at the end of the rotating handle and meshes with the gear ring, the gear ring further drives the pinion to rotate, the ball screw is fixedly connected to the middle of the pinion through an internal threaded tube, and the clamping claw is adjusted by rotating the rotating handle to be firmly clamped on the tire rim;

[0005] Furthermore, the measuring mechanism includes a horizontal rotating bracket, a clamping device and a laser pen. Cylindrical pins are arranged at both ends of the horizontal rotating bracket. The cylindrical pins are connected to springs. The horizontal rotating bracket is rotated to drive the cylindrical pins therein to rotate. The cylindrical pins are stuck in the raised ring on the inner side of the cover plate to form resistance, and the emission angle of the laser pen is adjusted by rotating the horizontal rotating bracket.

[0006] Furthermore, the claw is clamped on the edge of the rim, and the rotating handle is adjusted according to the rim diameter to drive the adjusting gear to rotate, thereby driving the gear ring to rotate, and the gear ring drives the pinion to rotate, thereby driving the ball screw to move up and down, and then driving the claw to move until the claw is firmly clamped on the tire rim.

[0007] Furthermore, a clamping device fixes the laser pen on a horizontal rotating bracket, and adjusts the angle of the horizontal rotating bracket until the bubble of the level is in a center position, ensuring that the light beam emitted by the laser pen is in a horizontal direction.

[0008] The measuring mechanism is mainly composed of a laser pen and a displacement measuring device. The beam emitted by the laser pen is irradiated on the preset measuring plane. When the input angle command is sent to the wire-controlled chassis, the steering wheel rotates, and the irradiation point of the laser pen moves left and right. The displacement measuring device can accurately measure the moving distance. Through the vertical distance between the preset measuring point and the laser pen and the measured left and right moving distance of the irradiation point, the turning angle of the left and right steering wheels can be calculated according to the Pythagorean theorem of triangles.

[0009] The tire angle measuring device of the present invention can conveniently and quickly measure the tire angles of wheels with different diameters accurately, providing a reliable measurement method for automobile research and development, manufacturing, and performance testing, and providing basic data for intelligent driving of vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a front view of a wire-controlled chassis tire turning angle measuring device disclosed in the present invention;

[0011] Figure 2 It is a rear view of a wire-controlled chassis tire turning angle measuring device disclosed in the present invention;

[0012] Figure 3 It is a front view of an angle adjustment mechanism of a wire-controlled chassis tire angle measuring device disclosed in the present invention;

[0013] Figure 4 It is a front view of a fixing mechanism of a wire-controlled chassis tire angle measuring device disclosed in the present invention;

[0014] Figure 5 It is a partial cross-sectional view of a measuring mechanism of a wire-controlled chassis tire turning angle measuring device disclosed in the present invention;

[0015] Figure 6 It is a schematic diagram of the internal structure of a wire-controlled chassis tire angle measurement device disclosed in the present invention;

[0016] Figure 7It is a cross-sectional schematic diagram of the connection structure between the gear ring and the cover plate of a wire-controlled chassis tire angle measuring device disclosed in the present invention;

[0017] Figure 8 It is a schematic diagram of a measurement method of a wire-controlled chassis tire angle measurement device disclosed in the present invention.

[0018] Figure numerals: 1. rotating handle; 2. adjusting gear; 3. gear ring; 4. pinion; 5. ball screw; 6. fixing frame; 7. claw; 8. horizontal rotating bracket; 9. cylindrical pin; 10. clamping device; 11. laser pen; 12. cover plate; 13. dial; 14. rear cover plate; 15. spring; 16. ball. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1-Figure 5 As shown, the present invention discloses a wire-controlled chassis tire angle measuring device, including a fixing mechanism, a measuring mechanism and an angle adjustment mechanism: the fixing mechanism includes a rotating handle 1, a gear ring 3, an adjusting gear 2 and a pinion 4 meshing with the gear ring 3, a ball screw 5, a fixing frame 6, a claw 7, a cover plate 12, a dial 13, and a rear cover plate 14; the measuring mechanism includes a horizontal rotating bracket 8, a cylindrical pin 9, a clamping device 10, a laser pen 11, and a spring 15; the adjusting gear 2 is arranged at the end of the rotating handle 1, and the external threaded tube of the ball screw 5 is fixedly connected to the middle of the pinion 4. Figure 7 As shown, the outer circumference of the gear ring 3 is provided with balls 16 , and the gear ring 3 is rotatably connected in the cover plate 12 through the balls 16 .

[0021] Method of using the fixing mechanism: clamp the claw 7 on the edge of the rim, adjust the rotating handle 1 according to the rim diameter to drive the adjusting gear 2 to rotate; then drive the gear ring 3 to rotate; the gear ring 3 drives the pinion 4 to rotate, thereby driving the ball screw 5 to move up and down, and then the movement drives the claw 7 to move until the claw 7 is firmly clamped on the tire rim.

[0022] like Figure 6 As shown, in the whole measuring device, three pinions 4, three ball screws 5 and three claws 7 are provided, and the angle between them is 120°. The gear parameters of the three pinions 4 are the same as those of the gear ring 3, and the three ball screws 5 are also of the same size. When the gear ring 3 rotates, the moving speed and moving distance of the three claws 7 are also the same, so as to ensure that the disc and the rim are concentric.

[0023] V-shaped grooves are provided on both sides of the claw 7 so that the claw 7 will not rotate when sliding in the fixed frame 6 under the power of the ball screw 5, so that the claw 7 moves stably. Cylindrical pins 9 are provided at both ends of the horizontal rotating bracket 8, and the cylindrical pins 9 are connected to the spring 15. The horizontal rotating bracket 8 is rotated to drive the cylindrical pins 9 therein to rotate. The cylindrical pins 9 are stuck in the raised ring on the inner side of the cover plate 12 to form resistance, so that the angle adjustment mechanism is kept in the preset position and the direction is adjusted according to the dial 13.

[0024] Method of using the measuring mechanism: fix the laser pen 11 with the clamping device 10, adjust the angle of the horizontal rotating bracket 8 until the bubble of the level is in the center position, and ensure that the light beam emitted by the laser pen 11 is horizontal.

[0025] The measurement method of this device is as follows Figure 7 As shown, park the vehicle with a white or light-colored wall in front of it, so that the front axle of the vehicle is parallel to the wall, and the distance between the vehicle and the wall is as large as possible, preferably more than 5 meters, to improve measurement accuracy.

[0026] The measuring device is clamped on the rims of the left and right wheels respectively, and the laser pen 11 is turned on to mark the position points of the left and right wheels when not turning. The irradiation point of the laser pen 11 moves left and right on the measuring plane, and the displacement measuring device measures the moving distance in real time. Assuming that the vertical distance L between the measuring point and the laser pen 11 is a known fixed value, which is determined during the installation and debugging of the device, the measured left and right moving distances of the irradiation point are L1 and L2, and a steering request is sent to the wire-controlled chassis. The turning angle is increased from a small angle and arithmetic progression, for example, from the steering angle of 50°, 100°, 150°, etc., until the maximum turning angle requirement, and the distance between the landing point of the laser pen 11 and the 0 point is recorded under each turning angle, and the left and right wheel turning angles are calculated by trigonometric functions. The above data are recorded to form the data of the steering angle input and the steering wheel angle output of the measured vehicle, providing accurate data for the debugging of intelligent driving.

[0027] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A wire-controlled chassis tire angle measuring device, characterized in that: The measuring device is divided into symmetrical parts installed on the left and right wheels, each of which includes a fixing mechanism, an angle adjustment mechanism and a measuring mechanism; the fixing mechanism is used to fix the measuring device on the rim, the angle adjustment mechanism connects the fixing mechanism and the measuring mechanism, and the angle adjustment mechanism includes a spirit level and a connecting piece with an adjustable angle.

2. The device for measuring the tire angle of a chassis controlled by wire according to claim 1, characterized in that: The fixing mechanism comprises a rotating handle (1), an adjusting gear (2), a gear ring (3), a pinion (4), a ball screw (5), a fixing frame (6), a clamping claw (7), a cover plate (12), a dial (13) and a rear cover plate (14); the adjusting gear (2) is arranged at the end of the rotating handle (1) and meshes with the gear ring (3); the gear ring (3) further drives the pinion (4) to rotate; the ball screw (5) is fixedly connected to the middle of the pinion (4) through an internal threaded tube; and the clamping claw (7) is adjusted by rotating the rotating handle (1) so as to be firmly clamped on the tire rim.

3. The device for measuring the tire angle of a chassis controlled by wire according to claim 1, characterized in that: The measuring mechanism comprises a horizontal rotating bracket (8), a clamping device (10) and a laser pen (11). Cylindrical pins (9) are arranged at both ends of the horizontal rotating bracket (8). The cylindrical pins (9) are connected to springs (15). The horizontal rotating bracket (8) is rotated to drive the cylindrical pins (9) therein to rotate. The cylindrical pins (9) are clamped into the raised ring on the inner side of the cover plate (12) to form resistance, so that the angle adjustment mechanism is maintained at a preset position and the direction is adjusted according to the dial (13); and the emission angle of the laser pen (11) is adjusted by rotating the horizontal rotating bracket (8).

4. The device for measuring the tire angle of a chassis controlled by wire according to claim 2, characterized in that: The clamping claw (7) is clamped on the edge of the wheel rim, and the rotating handle (1) is adjusted according to the wheel rim diameter to drive the adjusting gear (2) to rotate, thereby driving the gear ring (3) to rotate, and the gear ring (3) drives the pinion (4) to rotate, thereby driving the ball screw (5) to move up and down, thereby driving the clamping claw (7) to move until the clamping claw (7) is firmly clamped on the tire rim.

5. The device for measuring the tire angle of a chassis controlled by wire according to claim 3, characterized in that: The clamping device (10) fixes the laser pen (11) on the horizontal rotating bracket (8), and adjusts the angle of the horizontal rotating bracket (8) until the bubble of the level is in the center position, ensuring that the light beam emitted by the laser pen (11) is in the horizontal direction.

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