A kind of articulated lever constant velocity universal four-wheel aligner calibration unit

Abstract

This invention discloses a calibration unit for a constant velocity universal four-wheel alignment instrument with a hinged rod, belonging to the field of transportation technology. It includes a unit base, a drive motor mounted on one side of the unit base, a constant velocity rotating seat mounted above the unit base, a kingpin assembly mounted above the constant velocity rotating seat, half-shaft assemblies snapped onto both sides of the kingpin assembly, and angle adjustment assemblies sleeved above the kingpin assembly. Two angle adjustment assemblies are included, each comprising an angle adjustment base, an angle adjustment drive arm, an angle adjustment hinge plate, an angle adjustment kingpin sleeve, and an angle adjustment lever. The upper surface of the unit base is movably connected to the lower surface of the angle adjustment base. The inner side of the angle adjustment base is fitted to one end of the angle adjustment drive arm, and the other end of the angle adjustment drive arm is connected to the angle adjustment lever. The end of the angle adjustment lever away from the angle adjustment drive arm is connected to the angle adjustment hinge plate, and the inner side of the angle adjustment hinge plate is connected to the angle adjustment kingpin sleeve. This invention uses a constant velocity universal joint with a hinged rod, improving measurement accuracy.

Description

Technical Field

[0001] This invention belongs to the field of transportation technology, and in particular relates to a calibration unit for a constant velocity universal four-wheel alignment instrument with articulated rods. Background Technology

[0002] A four-wheel alignment machine is used to test the wheel alignment parameters of a car and compare them with the original factory design parameters, guiding users to make corresponding adjustments to the wheel alignment parameters to meet the original design requirements. Wheel alignment parameters include toe angle, camber angle, kingpin inclination angle, and caster angle. However, as a calibration device, the accuracy of a four-wheel alignment machine is difficult to calibrate during use. Calibration of the kingpin inclination and caster angles is particularly difficult because these parameters cannot be directly measured. Complex mathematical models are required to calculate these indirectly measured parameters, and the calculation process must ignore many relatively minor parameters for practical application, making it difficult to guarantee the accuracy of the test data. Only a qualified four-wheel alignment machine can accurately test the wheel alignment parameters of a car, so the calibration of four-wheel alignment machines is extremely important. Currently, there are three main types of portable four-wheel alignment machine testing devices:

[0003] 1. The integrated vehicle-mounted digital display four-wheel alignment instrument calibration device developed by Changchun Jier Technology Co., Ltd. has the invention patent number ZL200710055868.1 and the utility model patent number ZL 200720094051.0. This device has the following problems in use:

[0004] (1) The kingpin inclination angle and kingpin backclination angle are adjusted by using an arc-shaped guide rail. The arc-shaped guide rail has high machining accuracy, which increases the machining cost.

[0005] (2) Adjusting the kingpin inclination angle by using the lead screw nut increases the weight of the equipment and processing costs of the transmission mechanism;

[0006] (3) The lower end of the simulated kingpin is connected to the kingpin cross shaft. It is a non-constant velocity universal joint, that is, when measuring the kingpin inclination angle, the horizontal rotation angle and the angle through which the kingpin rotates around itself are not equal.

[0007] 2. Ball cage constant velocity universal four-wheel alignment machine inspection table

[0008] Invention Patent No.: ZL202110379943.X

[0009] The device has the following problems during use:

[0010] (1) The device uses a simplified ball cage constant velocity universal joint connection, but the structure of the ball cage universal joint is complex and the processing accuracy is high. If there is a gap between the universal joint structures, it is impossible to achieve constant angular velocity rotation.

[0011] (2) During the zero-point inspection process, the sensor is prone to unstable readings or no readings, which affects the calibration quality of the four-wheel alignment instrument.

[0012] 3. Direct-drive robotic arm type single-wheel kingpin inclination and kingpin caster angle calibration device

[0013] Invention Patent No.: ZL201510166595.2, Utility Model Patent No.: ZL201520212208.X

[0014] The device has a problem where the horizontal rotation angle and the angle through which the kingpin rotates around itself are not the same when measuring the kingpin tilt angle. Summary of the Invention

[0015] The purpose of this invention is to provide a constant velocity universal joint four-wheel alignment instrument calibration unit with a hinged rod, which solves the problem of measurement error caused by the non-uniform velocity of the universal joint during the calibration process of existing four-wheel alignment instrument calibration devices.

[0016] To achieve the above objectives, the present invention provides a calibration unit for a constant velocity universal four-wheel alignment instrument with a hinged rod, comprising a unit base, a drive motor disposed on one side of the unit base, a constant velocity rotating seat disposed above the unit base, a kingpin assembly disposed above the constant velocity rotating seat, a half-shaft assembly snapped onto both sides of the kingpin assembly, and an angle adjustment assembly sleeved above the kingpin assembly. The number of angle adjustment assemblies is two, each comprising an angle adjustment base, an angle adjustment drive arm, an angle adjustment hinge plate, an angle adjustment kingpin sleeve, and an angle adjustment lever. The upper surface of the unit base is movably connected to the lower surface of the angle adjustment base by screws. The inner side of the angle adjustment base is fitted with one end of the angle adjustment drive arm, and the other end of the angle adjustment drive arm is connected to the angle adjustment lever. The end of the angle adjustment lever away from the angle adjustment drive arm is connected to the angle adjustment hinge plate, and the inner side of the angle adjustment hinge plate is connected to the angle adjustment kingpin sleeve.

[0017] Preferably, one end of the constant velocity rotating seat is provided with a constant velocity seat inner spherical surface, and the other end of the constant velocity rotating seat is provided with a constant velocity seat hinge rod insertion hole, a constant velocity seat small shaft protruding above the constant velocity seat hinge rod insertion hole, and a constant velocity seat shaft hole provided above the constant velocity seat small shaft.

[0018] Preferably, an encoder is provided inside the unit seat, and the output shaft of the encoder is inserted inside the constant velocity seat shaft hole.

[0019] Preferably, the master pin assembly includes a master pin rod, master pin side connecting plates disposed on both sides of the master pin rod, a master pin ball head disposed at one end of the master pin rod near the master pin side connecting plate, and a master pin locking plate disposed between the two master pin side connecting plates.

[0020] Preferably, the outer spherical surface of the kingpin ball head is in contact with the inner spherical surface of the constant velocity seat.

[0021] Preferably, the drive motor is located at one end of the adjustment base, and the encoder is located on one side of the adjustment base.

[0022] Therefore, the present invention adopts the above-mentioned structure to provide a hinged rod constant velocity universal joint four-wheel alignment instrument calibration unit. By using a hinged rod constant velocity universal joint structure, it ensures that the angles rotated by both are equal at each point, thereby solving the problem of errors in measuring the kingpin inclination angle in the existing four-wheel alignment instrument calibration device where the horizontal rotation mechanism and the kingpin are connected by a cross universal joint.

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a projection diagram of the calibration unit of the articulated rod constant velocity universal four-wheel alignment instrument of the present invention;

[0025] Figure 2 This is the present invention. Figure 1 AA cross-section view;

[0026] Figure 3 This is the present invention. Figure 1 The right view;

[0027] Figure 4 This is a perspective view of the calibration unit of the articulated rod constant velocity universal four-wheel alignment instrument of the present invention;

[0028] Figure 5 This is a perspective view of the unit base of the present invention;

[0029] Figure 6 This is a perspective view of the unit base of the present invention from another angle;

[0030] Figure 7 This is a projection view of the worm gear of the front pressure plate of the present invention;

[0031] Figure 8 This is the present invention. Figure 7 CC cross-section;

[0032] Figure 9 This is a perspective view of the front beam encoder connecting plate of the present invention;

[0033] Figure 10 This is a perspective view of the drive worm gear of the present invention;

[0034] Figure 11 This is a projection view of the drive motor connection plate of the present invention;

[0035] Figure 12 This is the present invention. Figure 11 BB cross-section;

[0036] Figure 13 This is a perspective view of the constant velocity rotating seat of the present invention;

[0037] Figure 14 This is a projection view of the constant velocity rotating seat of the present invention;

[0038] Figure 15 This is the present invention. Figure 14 The right view;

[0039] Figure 16 This is a perspective view of the drive motor of the present invention;

[0040] Figure 17 This is a perspective view of the encoder of the present invention;

[0041] Figure 18 This is a perspective view of the present invention with a shoulder pin.

[0042] Figure 19 This is a perspective view of the main pin assembly of the present invention;

[0043] Figure 20 This is a perspective view of the constant velocity hinge rod of the present invention;

[0044] Figure 21 This is a perspective view of the half-shaft assembly of the present invention;

[0045] Figure 22 This is a perspective view of the angle adjustment assembly of the present invention;

[0046] Figure 23 This is a perspective view of the angle-adjusting base of the present invention;

[0047] Figure 24 This is a perspective view of the angle-adjusting base of the present invention from another angle;

[0048] Figure 25 This is a perspective view of the angle-adjusting drive arm of the present invention;

[0049] Figure 26 This is a perspective view of the angle-adjusting hinge plate of the present invention;

[0050] Figure 27 This is a perspective view of the angle-adjusting locking nut of the present invention;

[0051] Figure 28 This is a perspective view of the adjusting main pin sleeve of the present invention;

[0052] Figure 29 This is a perspective view of the angle adjustment lever of the present invention;

[0053] Explanation of reference numerals in the attached figures:

[0054] 1. Unit base; 101. Constant velocity mounting hole; 102. Worm mounting hole; 103. Outer side of unit base; 104. Inner side of unit base; 105. Inward tilting connection hole of unit base; 106. Backward tilting connection hole of unit base; 2. Front beam encoder connecting plate; 3. Front beam pressure plate worm gear; 301. Front beam worm gear; 302. Mounting surface of front beam pressure plate worm gear; 4. Drive worm; 5. Drive motor connecting plate; 501. Motor mounting surface; 502. Fixing surface of connecting plate; 6. 1. Constant velocity rotary seat; 601. Inner spherical surface of constant velocity seat; 602. Hinge rod insertion hole of constant velocity seat; 603. Small shaft of constant velocity seat; 604. Shaft hole of constant velocity seat; 7. Kingpin assembly; 701. Kingpin rod; 702. Side connecting plate of kingpin; 703. Hinge rod insertion hole of kingpin; 704. Kingpin ball head; 705. Kingpin locking plate; 8. Constant velocity hinge rod; 801. Constant velocity hinge mating surface; 9. Half shaft assembly; 901. Half shaft locking surface; 902. Side connecting plate of half shaft; 10. 11. Shoulder pin; 12. Encoder; 13. Angle adjustment assembly; 14. Angle adjustment base; 15. Angle adjustment base fixing hole; 16. Angle adjustment encoder connecting plate; 17. Angle adjustment support plate; 18. Angle adjustment side plate; 19. Angle adjustment worm gear mounting hole; 10. Angle adjustment encoder stop; 11. Angle adjustment drive arm; 12. Angle adjustment lever sliding hole; 13. Angle adjustment arm shaft. Holes; 120203, lever arm encoder tightening screw hole; 120204, lever arm worm gear; 1203, angle adjustment hinge plate; 120301, angle adjustment hinge hole; 120302, angle adjustment hinge end plate; 1204, angle adjustment master pin sleeve; 120401, angle adjustment master pin hole; 120402, angle adjustment master pin hinge hole; 1205, angle adjustment lever; 1206, angle adjustment lock nut; 13, drive motor; 14, constant velocity hinge rod pin; 15, hand-tightening screw. Detailed Implementation

[0055] Example

[0056] The following detailed description of embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0057] See Figure 1-4A calibration unit for a constant velocity universal four-wheel alignment instrument with an articulated rod includes a unit base 1, a constant velocity mounting hole 101, a worm gear mounting hole 102, an outer surface 103 of the unit base, an inner surface 104 of the unit base, an inward tilting connection hole 105 of the unit base, a backward tilting connection hole 106 of the unit base, a toe-in encoder connecting plate 2, a toe-in pressure plate worm gear 3, a toe-in worm gear 301, a toe-in pressure plate worm gear mounting surface 302, a drive worm gear 4, a drive motor connecting plate 5, a motor mounting surface 501, a connecting plate fixing surface 502, a constant velocity rotating seat 6, and a constant velocity seat inner ball. Surface 601, constant velocity seat hinge rod insertion hole 602, constant velocity seat small shaft 603, constant velocity seat shaft hole 604, main pin assembly 7, main pin rod 701, main pin side connecting plate 702, main pin hinge rod insertion hole 703, main pin ball head 704, main pin locking plate 705, constant velocity hinge rod 8, constant velocity hinge mating surface 801, half shaft assembly 9, half shaft locking surface 901, half shaft side connecting plate 902, shouldered pin 10, encoder 11, angle adjustment assembly 12, drive motor 13, constant velocity hinge rod pin 14 and hand-tightening screw 15; see reference Figure 5-18 The lower plane of unit seat 1 is placed on the workbench. The constant velocity seat shaft 603 of constant velocity rotating seat 6 is inserted into the constant velocity mounting hole 101. The shoulder end face of the constant velocity seat shaft 603 is in contact with the upper plane of unit seat 1. The mounting surface 302 of the front toe plate worm gear 3 is in contact with the end face of the constant velocity seat shaft 603 and fixed with screws. The drive worm 4 is inserted into the worm gear mounting hole 102 and meshes with the front toe worm gear 301. The shoulder end face of the drive worm 4 is in contact with the inner side surface 104 of the unit seat. The connecting plate of the drive motor connecting plate 5 is connected. The mounting surface 502 is attached to the outer side 103 of the unit base and fixed with screws; the mounting surface of the drive motor 13 is attached to the motor mounting surface 501 and fixed with screws; the output shaft of the drive motor 13 is inserted into the semi-circular hole at one end of the drive worm gear 4; the two sides of the front-beam encoder connecting plate 2 are attached to the inner sides of the two upright plates of the unit base 1 and fixed with screws; the stop of the encoder 11 is attached to the middle hole of the front-beam encoder connecting plate 2 and fixed with screws; the output shaft of the encoder 11 is inserted into the constant velocity seat shaft hole 604 and tightened with screws; see reference. Figure 18-21The outer spherical surface of the main pin ball head 704 of the main pin assembly 7 is fitted to the inner spherical surface 601 of the constant velocity seat. The constant velocity hinge rod 8 is inserted into the hinge rod insertion hole 602 of the constant velocity seat, and another constant velocity hinge rod 8 is inserted into the main pin hinge rod insertion hole 703. The two constant velocity hinge mating surfaces 801 are fitted together. The constant velocity hinge rod pin 14 is inserted into the holes of the two constant velocity hinge mating surfaces 801 and riveted. The other two sets of constant velocity hinge rods 8 are connected in the same way. The two half-shaft side connecting plates 902 of the half-shaft assembly 9 are... The inner side of the two main pin side connecting plates 702 is attached to the outer side of the two main pin side connecting plates 902 and the two shoulder pin shafts 10 are respectively inserted into the holes of the two half shaft side connecting plates 902 and the main pin side connecting plate 702. The shoulder end faces of the two shoulder pin shafts 10 are attached to the outer side of the two half shaft side connecting plates 902. One side of the main pin locking plate 705 is attached to the half shaft locking surface 901. The hand screw 15 is inserted into the arc-shaped elongated hole of the main pin locking plate 705 and screwed into the threaded hole in the middle of the half shaft locking surface 901 to lock it.

[0058] See Figure 22-29The angle adjustment assembly 12 consists of an angle adjustment base 1201, an angle adjustment base fixing hole 120101, an angle adjustment encoder connecting plate 120102, an angle adjustment support upright plate 120103, an angle adjustment side plate 120104, an angle adjustment worm gear mounting hole 120105, an angle adjustment encoder stop 120106, an angle adjustment drive arm 1202, an angle adjustment lever sliding hole 120201, an arm shaft hole 120202, an arm encoder tightening screw hole 120203, an arm worm gear 120204, an angle adjustment hinge plate 1203, and an angle adjustment hinge hole 120102. Composed of an angle-adjusting hinge end plate 120302, an angle-adjusting main pin sleeve 1204, an angle-adjusting main pin hole 120401, an angle-adjusting main pin hinge hole 120402, an angle-adjusting lever 1205, and an angle-adjusting locking nut 1206; the two side planes of the arm worm gear 120204 of the angle-adjusting drive arm 1202 are fitted to the inner side planes of the angle-adjusting encoder connecting plate 120102 and the angle-adjusting support upright plate 120103 of the angle-adjusting base 1201; the stop of another encoder 11 is fitted to the stop of the angle-adjusting encoder 120106 and fixed with screws. The output shaft of encoder 11 is inserted into the middle through hole of angle-adjusting encoder connecting plate 120102, the lever arm shaft hole 120202, and the upper hole of angle-adjusting support plate 120103. A set screw is screwed into the lever arm encoder tightening screw hole 120203 for tightening. Another drive worm gear 4 is inserted into the angle-adjusting worm gear mounting hole 120105 and meshes with the lever arm worm wheel 120204. The fixing surface 502 of another connecting plate is attached to the outer plane of the angle-adjusting side plate 120104 and fixed with screws. The mounting surface of another drive motor 13 is attached to the mounting surface 501 of another motor and fixed with screws. The output shaft of another drive motor 13 is inserted into the semi-circular hole at one end of another drive worm gear 4; the angle adjustment lever 1205 is inserted into the sliding hole 120201 of the angle adjustment lever, and the small shaft at one end of the angle adjustment lever 1205 is inserted into the middle hole of the angle adjustment hinge end plate 120302; the angle adjustment locking nut 1206 is tightened and positioned; the outer end faces of the two angle adjustment main pin hinge holes 120402 of the angle adjustment main pin sleeve 1204 are attached to the inner end faces of the two angle adjustment hinge holes 120301; and the other two shouldered pins 10 are respectively inserted into the two angle adjustment hinge holes 120301 and pressed against the shaft shoulders.

[0059] The two angle adjustment assemblies 12 are identical except for the length of the two angle adjustment drive arms 1202. The lower plane of the angle adjustment base 1201 of one angle adjustment assembly 12 is attached to the upper plane of the unit seat 1. Two screws are inserted into the two angle adjustment base fixing holes 120101 and the unit seat inward tilting connection hole 105 respectively and locked. The main pin 701 is inserted into the angle adjustment main pin hole 120401. The lower plane of the angle adjustment base 1201 of the other angle adjustment assembly 12 is attached to the upper plane of the unit seat 1. Two screws are inserted into the two angle adjustment base fixing holes 120101 and the unit seat backward tilting connection hole 106 respectively and locked. The main pin 701 is inserted into the other angle adjustment main pin hole 120401.

[0060] Specific work process:

[0061] Toe-in and camber angle detection operation method: Install the simulated wheel hub or target plate on the axle end of the half-shaft assembly 9, loosen the hand screw 15 to make the axle of the half-shaft assembly 9 horizontal, and tighten the hand screw 15; operate the corresponding drive motor 13 to rotate the half-shaft assembly 9 to the set angle in the horizontal plane, and compare with the four-wheel alignment instrument reading to calibrate the toe-in angle; operate the kingpin inclination drive motor 13 of the corresponding angle adjustment assembly 12 to rotate the half-shaft assembly 9 in the vertical plane, and compare with the four-wheel alignment instrument reading to calibrate the camber angle.

[0062] Operation method for testing kingpin inclination and caster angles: Operate the drive motors 13 of the two angle adjustment assemblies 12 to make the kingpin rod 701 perpendicular to the horizontal plane, and clear the kingpin inclination angle reading to the zero point; Operate the drive motors 13 of the two angle adjustment assemblies 12 to make the kingpin rod 701 form a set angle in the longitudinal and transverse planes; Loosen the hand screws 15 to make the shaft of the half-shaft assembly 9 horizontal, and tighten the hand screws 15; According to the four-wheel alignment instrument, operate the corresponding drive motors 13 to make the half-shaft assembly 9 rotate to the specified position in the horizontal plane to complete the simulated steering action; The four-wheel alignment instrument can then obtain the measured values ​​of the kingpin inclination and caster angles, compare them with the set values, and complete the calibration of the kingpin inclination and caster angles of the four-wheel alignment instrument.

[0063] Therefore, this invention employs the aforementioned articulated rod constant velocity universal joint four-wheel alignment instrument calibration unit to solve the measurement error problem caused by the non-uniform velocity of the universal joint during the calibration process of existing four-wheel alignment instrument calibration devices. This invention features a reasonable design structure and utilizes an articulated rod constant velocity universal joint connection to ensure that the horizontal rotation mechanism and the kingpin rotate at a constant angular velocity, thereby improving measurement accuracy.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A calibration unit for a constant velocity universal four-wheel alignment instrument with a hinged rod, characterized in that: The device includes a unit base, a drive motor disposed on one side of the unit base, a constant velocity rotating seat disposed above the unit base, a main pin assembly disposed above the constant velocity rotating seat, a half-shaft assembly snapped onto both sides of the main pin assembly, and an angle adjustment assembly sleeved above the main pin assembly. There are two angle adjustment assemblies, each including an angle adjustment base, an angle adjustment drive arm, an angle adjustment hinge plate, an angle adjustment main pin sleeve, and an angle adjustment lever. The upper surface of the unit base is movably connected to the lower surface of the angle adjustment base by screws. The inner side of the angle adjustment base is fitted to one end of the angle adjustment drive arm, and the other end of the angle adjustment drive arm is connected to the angle adjustment lever. The end of the angle adjustment lever away from the angle adjustment drive arm is connected to the angle adjustment hinge plate, and the inner side of the angle adjustment hinge plate is connected to the angle adjustment main pin sleeve. One end of the constant velocity rotating seat is provided with a constant velocity seat inner spherical surface, and the other end of the constant velocity rotating seat is provided with a constant velocity seat hinge rod insertion hole, a constant velocity seat small shaft protruding above the constant velocity seat hinge rod insertion hole, and a constant velocity seat shaft hole provided above the constant velocity seat small shaft. An encoder is provided inside the unit seat, and the output shaft of the encoder is inserted into the shaft hole of the constant velocity seat. The master pin assembly includes a master pin rod, master pin side connecting plates disposed on both sides of the master pin rod, a master pin ball head disposed at one end of the master pin rod near the master pin side connecting plate, and a master pin locking plate disposed between the two master pin side connecting plates. The outer spherical surface of the main pin ball head is in contact with the inner spherical surface of the constant velocity seat.

2. The calibration unit for a constant velocity universal four-wheel alignment instrument with a hinged rod according to claim 1, characterized in that: The drive motor is located at one end of the angle-adjusting base, and the encoder is located on one side of the angle-adjusting base.

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