Automobile wheel speed measuring device and using method

Abstract

A vehicle wheel speed measuring device, in which a limit rod control mechanism is adsorbed on the hood of the vehicle through a suction cup, and the limit rod can be limited by the control mechanism so that it does not swing with the wheel axis as the rotation axis, and the sensor can be controlled to always be in a relatively static state with the wheel when the wheel is turned, and three suction cups are arranged on the suction cup seat of the limit rod control mechanism, two of which can slide inward and outward to adjust the position, so that the spacing between the three suction cups can avoid the ridges or steps on the hood, and the adsorption is more firm; each tightening claw in the speed measuring device can be synchronously retracted inward, and the arc grooves on the arc plate outside the tightening claw move synchronously towards each other and clamp on the conical head of the wheel hub nut, and the outer end of the elastic plate can be tightly clamped on the conical head of the wheel hub nut, and the axial limiting effect of the conical head and the elastic tightening force of the tightening claw can firmly fix the gripper on the wheel hub nut, thereby ensuring the firmness of the connection of the speed measuring device.

Description

Technical Field

[0001] The invention relates to the field of automobile wheel speed measuring equipment, and in particular to an automobile wheel speed measuring device and a use method thereof. Background Art

[0002] In vehicle road tests, many tests require measuring wheel speed, such as ABS test, TCS test, ESP test, etc. All cars equipped with ABS system can obtain wheel speed through ABS wheel speed sensor. The signal acquisition method is to connect the test circuit in parallel to the signal line of the wheel speed sensor. However, this method adds an external load to the ABS controller. On the one hand, it may cause the ABS system to alarm due to sensor impedance mismatch and exit ABS control; on the other hand, obtaining wheel speed from the external line on the original packaged ABS wiring harness will affect the safety of the ABS system, such as waterproof performance. Therefore, some manufacturers and colleges have developed wheel speed measuring devices that are mounted on the wheel hub, and use the wheel speed measuring devices to measure the wheel speed during road tests separately. However, the wheel speed meter is clamped on the wheel hub nut by a clamp, and then the wheel speed measuring device is connected to the wheel. The clamp of this clamp is sleeved on the outer side of the wheel hub nut, and the clamping force is limited, and it cannot provide strong support for the wheel speed sensor. During the speed measurement of the car, the clamp is prone to loosening, resulting in the whole wheel speed meter falling off. In addition, this clamp has poor versatility and cannot be used for wheel hub nuts of different sizes, and cannot be used for wheel speed measurement of different types of vehicles. In addition, this wheel speed meter can only be used for straight road tests of vehicles. If the wheel needs to turn when performing a curve test, the connecting rod will produce an arc displacement with the vertical line where the rotation center point of the wheel is located as the rotation center line. Under the restriction of the fixing mechanism above the wheel speed meter, it will cause the speed measuring generator and the connecting rod to get stuck or the whole speed measuring device to be pulled off. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a vehicle wheel speed measuring device and a use method thereof.

[0004] The technical solution of the present invention is: a vehicle wheel speed measuring device, the device comprises a limit rod, an encoder, a faceplate, a faceplate connecting mechanism, and a limit rod control mechanism; each wheel hub nut is axially fixedly connected with a faceplate connecting mechanism, the faceplate is fixed between the outer ends of each faceplate connecting mechanism, and the faceplate and the wheel are coaxially arranged;

[0005] The input of the encoder is fixedly connected to the center of the outer end surface of the disc through a coupling. A connecting seat is fixed on the encoder, and the lower end of the limit rod is hinged on the connecting seat so that the limit rod can swing toward the axial direction of the wheel;

[0006] The limit rod control mechanism includes a sliding seat, a hinge seat, a hinge plate, and a suction cup seat. The sliding seat sleeve is covered on the upper part of the limit rod to form a cylindrical pair. The suction cup seat is horizontally arranged and a suction cup is provided on the bottom surface of the suction cup seat. The suction cup is adsorbed on the surface of the hood. One end of the hinge seat is fixedly connected to the upper surface of the suction cup seat. A square slide groove is provided in the hinge seat to form the hinge seat into a U-shaped fork. The sliding surface in the square slide groove is set as a horizontal plane. Long slide holes are provided on both ear plates of the hinge seat, and the two long slide holes face downward; one end of the hinge plate is inserted into the square slide groove of the hinge seat to form a plane pair, and a vertical pin shaft is inserted between the two long slide holes. The vertical pin shaft passes through the circular hole set at the end of the hinge plate to form a rotating pair with the hinge plate. The other end of the hinge plate is fixedly connected or hinged to the sliding seat.

[0007] Preferably, the suction cup seat is in the shape of a triangular plate, and three suction cups are provided on the bottom surface of the suction cup seat, and the three suction cups are all close to the corners of the suction cup seat; a long hole is provided at the center of the two corners of the suction cup seat, and a screw that passes upward through the long hole is provided on the corresponding suction cup, and fastening nuts are provided at both ends of the screw.

[0008] Preferably, the flower disc is a circular disc, and a plurality of long holes are radially arranged on the flower disc, and the angles formed between the long holes are different.

[0009] Preferably, the faceplate connecting mechanism comprises a circular outer sleeve, a circular inner sleeve, and a bolt; one end of the outer sleeve is open, and the other end is provided with an end plate A, the center of the end plate A is provided with a circular hole, the inner sleeve is coaxially sleeved in the outer sleeve, the inner end surface of the inner sleeve is evenly distributed with a plurality of elastic plates along the circumferential direction, a pair of spacers are provided between the elastic plates, and a tightening claw is provided at the inner end of the elastic plate, the tightening claw is located outside the port of the outer sleeve, the outer port of the inner sleeve is provided with an end plate B, the center of the end plate B is provided with a threaded hole, the inner end surface of the faceplate is attached to each end plate A, and the bolt passes through the long hole of the faceplate and the circular hole of the outer sleeve in sequence and is inserted into the threaded hole of the inner sleeve.

[0010] Preferably, the tightening claw head includes an arc plate A and an arc plate B, the arc plate A is connected to the outer end of the elastic plate in an outwardly inclined posture, the outer side surface of the arc plate A corresponds to the inner edge of the outer sleeve port, the outer end surface of the arc plate A is axially provided with an intermediate plate, the arc plate B is connected to the outer end of the intermediate plate and has a symmetrical structure with the arc plate A.

[0011] Preferably, an arc-shaped groove is provided on the end surface of the arc-shaped plate B, and the centerline direction of the arc-shaped groove is consistent with the axial direction of the inner sleeve.

[0012] Preferably, the inner end of the outer sleeve is evenly distributed with a plurality of square notches along the circumferential direction, the length direction of the notches is consistent with the axial direction of the outer sleeve, and arc-shaped tooth plates with the same number as the elastic plates are formed between adjacent notches, the arc-shaped tooth plates are opposite to the elastic plates, and a semicircular clamp is mounted on the inner end of the outer sleeve, a clamp head is provided in the middle of the inner side surface of the semicircular clamp, and the clamp head is matched and inserted into one of the notches; a through hole is provided on one side of the semicircular clamp, and a threaded hole is provided on the arc-shaped tooth plate corresponding to the through hole, and a screw is inserted between the threaded hole and the through hole.

[0013] A method for using the vehicle wheel speed measuring device described above comprises the following steps:

[0014] The first step is to put the long holes on the faceplate on the outer ends of the bolts of each faceplate connection mechanism.

[0015] Then pull out the inner sleeve and put each tightening claw head onto the hub nut. At this time, the tightening claw head will first contact the rounded corner of the outer edge of the hub nut (the outer edge of the hub nut is provided with a rounded corner, the purpose is to facilitate the insertion of the wrench during disassembly). The guiding effect of the rounded corner can make each tightening claw head smoothly enter the side of the hub nut and get stuck into the conical head.

[0016] In the second step, the tightening bolts are used to press the outer sleeve inwards through the faceplate. During this process, the arc plates A of each tightening claw head contact the inner edge of the outer sleeve port. The pressing pressure of the inner edge forces the elastic plate to deform elastically inwards, and each tightening claw head shrinks inwards synchronously. The arc grooves on the outer arc plates of each tightening claw head move toward each other synchronously and clamp on the conical head of the hub nut. At the same time, the inner end of the elastic plate is tightly held on the hexagonal side of the hub nut. The axial limiting effect of the conical head and the elastic tightening force of the tightening claw head can firmly fix the faceplate connection mechanism on the hub nut, and then the faceplate is fixedly connected to the hub nut.

[0017] The third step is to rotate and connect the encoder to the middle of the outer end surface of the faceplate through the coupling, and hinge the lower end of the limit rod and the connecting seat, and cover the sliding seat of the limit rod control mechanism on the upper part of the limit rod;

[0018] Step 4: Adjust the distances between the three suction cups of the limit rod control mechanism to avoid the ridges or steps on the hood, suck the three suction cups tightly onto the hood, and then adjust the fastening nuts on the screws on two of the suction cups to adjust the suction cup seat to a horizontal state. At this time, the plane pair between the hinge seat and the hinge plate is in a horizontal state, and the encoder is limited and will not rotate relative to the wheel.

[0019] The fifth step is to measure the rotation speed of the wheel through a relatively stationary encoder when the wheel is moving forward. When the wheel is turning, the connecting rod will produce an arc displacement with the vertical line where the rotation center of the wheel is located as the rotation center line. At this time, under the action of the plane pair and the rotation pair, the limit rod can pull the hinge plate to rotate around the vertical pin shaft and push and pull the vertical pin shaft to slide along the long hole. Therefore, the control device can be linked with the limit rod to control the limit rod, and the limit rod will not be stuck due to the turning of the wheel.

[0020] The sixth step is that when the hinge plate slides in the square slide groove, the sliding surface horizontally arranged in the plane pair can provide horizontal limit for the hinge plate. Therefore, the hinge plate can limit the limit rod through the sliding seat so that it will not swing with the wheel axis as the rotation axis. When the wheel turns, the sensor can be controlled to always be in a relatively static state with the wheel, so as to realize continuous speed measurement when the wheel turns.

[0021] The beneficial technical effects of the present invention are:

[0022] (1) The limit rod control mechanism of the speed measuring device is attached to the hood of the car through a suction cup.

[0023] A hinge seat is fixed on the suction cup seat of the suction cup, and a hinge plate is connected to the hinge seat to form a plane pair and a rotation pair. When the wheel turns, the connecting rod will produce an arc displacement with the vertical line where the rotation center point of the wheel is located as the rotation center line. At this time, under the action of the plane pair and the rotation pair, the limit rod can pull the hinge plate to rotate with the vertical pin as the center, and can push and pull the vertical pin to slide along the long hole. Therefore, the control device can be linked with the limit rod, and the situation where the limit rod is stuck due to the turning of the wheel will not occur; in addition, the sliding surface horizontally arranged in the plane pair can provide horizontal limit for the hinge plate, so the hinge plate can limit the limit rod through the sliding seat, so that it will not swing with the wheel axis as the rotation axis. When the wheel turns, the sensor can be controlled to always be in a relatively static state with the wheel, so as to achieve continuous speed measurement. It has strong functionality and can be suitable for road speed measurement tests in various forms.

[0024] (2) The suction cup seat of the limit rod control mechanism in the speed measuring device is provided with three suction cups, two of which can slide inward and outward to adjust their positions, so that the spacing between the three suction cups can avoid the ridges or steps on the engine hood, and the adsorption is more secure; and the height of the two suction cups on the bottom of the suction cup can be adjusted by means of screws and fastening nuts, so that the suction cup seat can be adjusted to a horizontal state on the engine hood, avoiding the tilt of the plane pair between the hinge seat and the hinge plate due to the tilt of the suction cup seat, thereby ensuring the limiting effect of the plane pair on the limit rod.

[0025] (3) The faceplate connection mechanism in the speed measuring device includes an inner sleeve and an outer sleeve which are coaxially mounted. A long screw is provided between the outer sleeve and the inner sleeve. The long screw can pull the inner sleeve and the outer sleeve to slide toward each other. During the sliding process, the arc plates on the inner side of each tightening claw contact the inner edge of the port of the outer sleeve. The top pressure of the inner edge forces the elastic plate to deform elastically. Each tightening claw shrinks inward synchronously. The arc grooves on the arc plates on the outer side of the tightening claws move toward each other synchronously and are clamped on the conical head of the hub nut. The outer end of the elastic plate can be clamped on the conical head of the hub nut. The axial limiting effect of the conical head and the elastic tightening force of the tightening claws can firmly fix the gripper on the hub nut and prevent it from loosening, thereby ensuring the safety of the external speed measuring device during the speed measuring process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 is a schematic diagram of the side structure of the present invention (the dotted line in the figure is the rotation center line of the wheel);

[0028] Figure 3 yes Figure 2 A partial enlarged view of

[0029] Figure 4 A schematic diagram of the structure between a wheel and a hub nut in the prior art;

[0030] Figure 5 It is a structural schematic diagram of a hub nut in the prior art;

[0031] Figure 6 The trajectory diagram that will be generated when the limit rod is in a natural state (limit rod is not constrained) when the wheel is turning, where A1 is the trajectory of the limit rod generating an arc displacement with the rotation centerline of the wheel, A1' is the top view of A1, and A2 is the swing trajectory of the limit rod with the axis of the wheel as the rotation axis;

[0032] Figure 7 It is a schematic diagram of the three-dimensional structure between the limit rod control mechanism and the limit rod;

[0033] Figure 8 It is a three-dimensional structural schematic diagram of the limit rod control mechanism;

[0034] Fig. 9 yes Figure 8 Sectional view at B in the middle;

[0035] Fig.10 1. It is a schematic diagram of the structure of the suction cup seat and the suction cup from a top view;

[0036] Fig.11 yes Fig.10 AA section view;

[0037] Fig.12 It is a three-dimensional structural schematic diagram of the faceplate connection mechanism;

[0038] Fig.13 It is a schematic diagram of the main structure of the faceplate connection mechanism;

[0039] Fig.14 yes Fig.13 BB section view;

[0040] Fig.15 yes Fig.13 CC section view;

[0041] Fig.16 It is a structural schematic diagram after the faceplate connection mechanism and the hub nut are fixedly connected;

[0042] Fig.17 It is a three-dimensional structural schematic diagram of the inner sleeve of the present invention;

[0043] Fig.18 It is a schematic diagram of the three-dimensional structure after a semicircular clamp is installed on the faceplate connection mechanism of the present invention;

[0044] Fig.19 It is a three-dimensional structural schematic diagram of a semicircular clamp.

[0045] In the figure, 01. faceplate connection mechanism, 11. outer sleeve, 111. end plate A, 112. round hole, 12. inner sleeve, 121. elastic plate, 122. end plate B, 123. threaded hole, 13. bolt, 14. tightening claw, 141. arc plate A, 142. arc plate B, 143. middle plate, 144. arc groove 02 wheel 21. faceplate, 22. encoder, 221. coupling, 222. connecting seat , 223. input shaft, 23. wheel hub nut, 231. conical head, 232. hexagonal side, 233. fillet, 03. limit rod control mechanism, 31. limit rod, 32. sliding seat, 33. hinge seat, 331. square slide, 332. long slide hole, 34. hinge plate, 341. round hole, 35. suction cup seat, 351. suction cup, 352. long hole, 353. screw, 354. fastening nut, 355. U-shaped seat, 36. vertical pin shaft, 41. notch, 42. arc tooth plate, 43. semicircular clamp, 431. clamp head, 432. screw, 51. wheel hub, 52. wheel hub bolt. DETAILED DESCRIPTION

[0046] Example 1, see the attached specification Figure 1-19, a vehicle wheel speed measuring device, the device includes a limit rod, an encoder, a disc, a disc connecting mechanism, and a limit rod control mechanism; the encoder and the speed measuring generator have the same function, each wheel hub nut is axially fixedly connected with a disc connecting mechanism, the disc is fixed between the outer ends of each disc connecting mechanism, the disc and the wheel are coaxially arranged, and the inner end of the current wheel hub nut is usually provided with a conical head, through which the wheel and the wheel shaft are assisted to align, so as to ensure that the wheel and the wheel shaft are coaxial.

[0047] The input of the encoder is fixedly connected to the center of the outer end surface of the faceplate through a coupling. A connecting seat is fixed on the encoder. The lower end of the limit rod is hinged on the connecting seat so that the limit rod can swing toward the axial direction of the wheel. When the wheel rotates, the encoder can be in a stationary state relative to the wheel under the control of the limit rod. The input shaft of the encoder and the wheel rotate synchronously to measure the speed.

[0048] The limit rod control mechanism includes a sliding seat, a hinge seat, a hinge plate, and a suction cup seat. The sliding seat sleeve is mounted on the upper part of the limit rod to form a cylindrical pair. The suction cup seat is horizontally arranged and a suction cup is arranged on the bottom surface of the suction cup seat. The suction cup is adsorbed on the surface of the engine hood. One end of the hinge seat is fixedly connected to the upper surface of the suction cup seat. A square slide groove is arranged in the hinge seat to form the hinge seat into a U-shaped fork. The sliding surface in the square slide groove is set as a horizontal plane. Long sliding holes are arranged on both ear plates of the hinge seat, and the two long sliding holes face downwards. One end of the hinge plate is inserted into the square slide groove of the hinge seat to form a plane pair. The sliding surface arranged horizontally in the plane pair can slide against the hinge The chain plate provides horizontal limit, so the hinge plate can limit the limit rod through the sliding seat so that it will not swing with the wheel axis as the rotation axis. A vertical pin is inserted between the two long sliding holes. The vertical pin passes through the circular hole set at the end of the hinge plate to form a rotating pair with the hinge plate. The rotating pair and the above-mentioned plane pair enable the limit rod to pull the hinge plate to rotate around the vertical pin as the center, and can push and pull the vertical pin to slide along the long hole. Therefore, the control device can be linked with the limit rod, and the limit rod will not be stuck due to steering. The other end of the hinge plate is fixedly connected or hinged to the sliding seat.

[0049] The hood of a car is usually tilted toward the front of the car, and ridges and steps are usually set on the hood. Therefore, the suction cup seat is in the shape of a triangular plate, and three suction cups are set on the bottom of the suction cup seat. The three suction cups are close to the corners of the suction cup seat. The spacing between the three suction cups can avoid the ridges or steps on the hood, and the adsorption is more secure; a long hole is set toward the center at the two corners of the suction cup seat, and a screw rod passing through the long hole upward is set on the corresponding suction cup, and fastening nuts are set at both ends of the screw rod. The height of the two suction cups on the bottom of the suction cup can be adjusted by the screw rod and the fastening nut, so the suction cup seat can be adjusted to a horizontal state on the hood.

[0050] The faceplate is a circular plate, and a plurality of long holes are radially arranged on the faceplate. The angles formed between the long holes are different, so that the long holes can be adapted to vehicles of different models and sizes.

[0051] The hinge plate and the sliding seat are hinged so that the sliding seat can swing up and down at the end of the hinge plate. The hinged connection adds a degree of freedom between the hinge plate and the sliding seat, which improves the flexibility between the hinge plate, the sliding seat and the limit rod, and the linkage between the entire device is smoother. A U-shaped seat is provided at the center of the upper surface of the suction cup seat, and the hinge seat is fixed in the U-shaped seat by bolts. The U-shaped seat is provided to reserve installation space for the hinge seat, and is also convenient for installation and removal between the hinge seat and the suction cup seat. The limit rod is set as a circular hollow rod, which is conducive to reducing the overall weight of the limit rod control device.

[0052] The faceplate connection mechanism comprises a circular outer sleeve, a circular inner sleeve and a bolt; one end of the outer sleeve is open and the other end is provided with an end plate A, a circular hole is provided in the center of the end plate A, the inner sleeve is coaxially sleeved in the outer sleeve, a plurality of elastic plates are evenly distributed on the inner end surface of the inner sleeve along the circumferential direction, a pair of intervals are provided between the elastic plates, and a tightening claw is provided at the inner end of the elastic plate, the tightening claw is located on the outside of the port of the outer sleeve, an end plate B is provided on the outer port of the inner sleeve, a threaded hole is provided in the center of the end plate B, the inner end surface of the faceplate is attached to each end plate A, the bolt passes through the long hole of the faceplate and the circular hole of the outer sleeve in turn and is inserted into the threaded hole of the inner sleeve, a sliding pair is formed between the bolt and the through hole, when the bolt is rotated, the bolt can pull the inner sleeve through the threaded hole and can press the outer sleeve to drive the inner sleeve and the outer sleeve to slide toward each other.

[0053] At present, most of the connection methods between the hub nut and the wheel hub are as shown in the figure of the specification. Figure 5 As shown, a conical surface is provided on the outer edge of the bolt hole of the wheel hub. After the wheel hub nut and the wheel hub bolt are tightened, the conical head of the wheel hub nut is inserted into the conical surface, which plays the effect of centering the wheel hub.

[0054] Therefore, the tightening claws include an arc plate A and an arc plate B. The arc plate A is connected to the outer end of the elastic plate in an outwardly inclined posture. The outer side surface of the arc plate A corresponds to the inner edge of the outer sleeve port. The outer end surface of the arc plate A is axially provided with an intermediate plate. The arc plate B is connected to the outer end of the intermediate plate and has a symmetrical structure with the arc plate A. During the sliding process of the inner sleeve and the outer sleeve toward each other, the arc plate A of each tightening claw contacts the inner edge of the outer sleeve port, and the inner edge slides inward to press the arc plate A, forcing the elastic plate to deform elastically inward, and each tightening claw simultaneously shrinks inward and clamps on the conical head of the hub nut.

[0055] An arc groove is provided on the end face of the arc plate B, and the centerline direction of the arc groove is consistent with the axial direction of the inner sleeve. The arc groove is used to be sleeved on the conical head of the hub nut, which can increase the clamping force of each tightening claw on the conical head of the hub nut; the length of the inner sleeve is smaller than the length of the outer sleeve, so there can be sliding space for the inner sleeve in the outer sleeve.

[0056] The inner end portion of the outer sleeve is evenly distributed with a plurality of square notches along the circumferential direction, the length direction of the notches is consistent with the axial direction of the outer sleeve, and arc-shaped tooth plates with the same number as the elastic plates are formed between adjacent notches, the arc-shaped tooth plates are opposite to the elastic plates, and a semicircular clamp is sleeved on the inner end portion of the outer sleeve, and a clamp head is provided in the middle of the inner side surface of the semicircular clamp, and the clamp head is matched and clamped into one of the notches; when the bolt is tightened, the inner sleeve will rotate accordingly, which is not conducive to quickly pulling the inner sleeve to move to tighten the clamping claw head. At the same time, when the hub nut gripper is connected to the hub nut for speed measurement, the gravity of the speed measuring device itself will also cause the outer sleeve to rotate relative to the inner sleeve, affecting the accuracy of the speed measurement, and the clamp head of the clamp is clamped in the notch to play a limiting role to prevent the inner sleeve and the outer sleeve from rotating relative to each other.

[0057] A through hole is provided on one side of the semicircular clamp, and a threaded hole is provided on the arc-shaped toothed plate corresponding to the through hole. A screw is inserted between the threaded hole and the through hole, and the semicircular clamp is fixed to the outer sleeve by the screw to ensure the limiting effect of the clamp head.

[0058] Example 2, see the attached specification Figure 1-19 A method for using the vehicle wheel speed measuring device according to the first embodiment comprises the following steps:

[0059] The first step is to put the long holes on the faceplate on the outer ends of the bolts of each faceplate connection mechanism.

[0060] Then pull out the inner sleeve and put each tightening claw head onto the hub nut. At this time, the tightening claw head will first contact the rounded corner of the outer edge of the hub nut (the outer edge of the hub nut is provided with a rounded corner, the purpose is to facilitate the insertion of the wrench during disassembly). The guiding effect of the rounded corner can make each tightening claw head smoothly enter the side of the hub nut and get stuck into the conical head.

[0061] In the second step, the tightening bolts are used to press the outer sleeve inwards through the faceplate. During this process, the arc plates A of each tightening claw head contact the inner edge of the outer sleeve port. The pressing pressure of the inner edge forces the elastic plate to deform elastically inwards, and each tightening claw head shrinks inwards synchronously. The arc grooves on the outer arc plates of each tightening claw head move toward each other synchronously and clamp on the conical head of the hub nut. At the same time, the inner end of the elastic plate is tightly held on the hexagonal side of the hub nut. The axial limiting effect of the conical head and the elastic tightening force of the tightening claw head can firmly fix the faceplate connection mechanism on the hub nut, and then the faceplate is fixedly connected to the hub nut.

[0062] The third step is to rotate and connect the encoder to the middle of the outer end surface of the faceplate through the coupling, and hinge the lower end of the limit rod and the connecting seat, and cover the sliding seat of the limit rod control mechanism on the upper part of the limit rod;

[0063] Step 4: Adjust the distances between the three suction cups of the limit rod control mechanism to avoid the ridges or steps on the hood, suck the three suction cups tightly onto the hood, and then adjust the fastening nuts on the screws on two of the suction cups to adjust the suction cup seat to a horizontal state. At this time, the plane pair between the hinge seat and the hinge plate is in a horizontal state, and the encoder is limited and will not rotate relative to the wheel.

[0064] The fifth step is to measure the rotation speed of the wheel through a relatively stationary encoder when the wheel is moving forward. When the wheel is turning, the connecting rod will produce an arc displacement with the vertical line where the rotation center of the wheel is located as the rotation center line. At this time, under the action of the plane pair and the rotation pair, the limit rod can pull the hinge plate to rotate around the vertical pin shaft and push and pull the vertical pin shaft to slide along the long hole. Therefore, the control device can be linked with the limit rod to control the limit rod, and the limit rod will not be stuck due to the turning of the wheel.

[0065] The sixth step is that when the hinge plate slides in the square slide groove, the sliding surface horizontally arranged in the plane pair can provide horizontal limit for the hinge plate. Therefore, the hinge plate can limit the limit rod through the sliding seat so that it will not swing with the wheel axis as the rotation axis. When the wheel turns, the sensor can be controlled to always be in a relatively static state with the wheel, so as to realize continuous speed measurement when the wheel turns.

Claims

1. A vehicle wheel speed measuring device, characterized in that: The device includes a limit rod, an encoder, a faceplate, a faceplate connecting mechanism, and a limit rod control mechanism; each hub nut is axially fixedly connected with a faceplate connecting mechanism, the faceplate is fixed between the outer ends of each faceplate connecting mechanism, and the faceplate and the wheel are coaxially arranged; The input of the encoder is fixedly connected to the center of the outer end surface of the disc through a coupling. A connecting seat is fixed on the encoder, and the lower end of the limit rod is hinged on the connecting seat so that the limit rod can swing toward the axial direction of the wheel; The limit rod control mechanism includes a sliding seat, a hinge seat, a hinge plate, and a suction cup seat. The sliding seat sleeve is covered on the upper part of the limit rod to form a cylindrical pair. The suction cup seat is horizontally arranged and a suction cup is provided on the bottom surface of the suction cup seat. The suction cup is adsorbed on the surface of the hood. One end of the hinge seat is fixedly connected to the upper surface of the suction cup seat. A square slide groove is provided in the hinge seat to form the hinge seat into a U-shaped fork. The sliding surface in the square slide groove is set as a horizontal plane. Long slide holes are provided on both ear plates of the hinge seat, and the two long slide holes face downward; one end of the hinge plate is inserted into the square slide groove of the hinge seat to form a plane pair, and a vertical pin shaft is inserted between the two long slide holes. The vertical pin shaft passes through the circular hole set at the end of the hinge plate to form a rotating pair with the hinge plate. The other end of the hinge plate is fixedly connected or hinged to the sliding seat.

2. The vehicle wheel speed measuring device according to claim 1, characterized in that: The suction cup seat is in the shape of a triangular plate, and three suction cups are arranged on the bottom surface of the suction cup seat, and the three suction cups are all close to the corners of the suction cup seat; a long hole is arranged toward the center at the two corners of the suction cup seat, and a screw rod passing through the long hole upward is arranged on the corresponding suction cup, and fastening nuts are arranged at both ends of the screw rod.

3. The vehicle wheel speed measuring device according to claim 1, characterized in that: The flower disc is a circular disc, and a plurality of long holes are arranged in the radial direction on the flower disc, and the angles formed between the long holes are different.

4. The vehicle wheel speed measuring device according to claim 3 is characterized in that: The faceplate connection mechanism comprises a circular outer sleeve, a circular inner sleeve and a bolt; one end of the outer sleeve is open and the other end is provided with an end plate A, a circular hole is provided in the center of the end plate A, the inner sleeve is coaxially sleeved in the outer sleeve, a plurality of elastic plates are evenly distributed on the inner end surface of the inner sleeve along the circumferential direction, a pair of spacers are provided between the elastic plates, and a tightening claw is provided at the inner end of the elastic plate, the tightening claw is located on the outside of the port of the outer sleeve, an end plate B is provided on the outer port of the inner sleeve, a threaded hole is provided in the center of the end plate B, the inner end surface of the faceplate is attached to each end plate A, and the bolt passes through the long hole of the faceplate and the circular hole of the outer sleeve in turn and is inserted into the threaded hole of the inner sleeve.

5. The vehicle wheel speed measuring device according to claim 4, characterized in that: The tightening claw head includes an arc plate A and an arc plate B. The arc plate A is connected to the outer end of the elastic plate in an outwardly inclined posture. The outer side surface of the arc plate A corresponds to the inner edge of the outer sleeve port. The outer end surface of the arc plate A is axially provided with an intermediate plate. The arc plate B is connected to the outer end of the intermediate plate and has a symmetrical structure with the arc plate A.

6. The vehicle wheel speed measuring device according to claim 5, characterized in that: The end surface of the arc plate B is provided with an arc groove, and the center line direction of the arc groove is consistent with the axial direction of the inner sleeve.

7. The vehicle wheel speed measuring device according to claim 4, characterized in that: The inner end of the outer sleeve is evenly distributed with a plurality of square notches along the circumferential direction, the length direction of the notches is consistent with the axial direction of the outer sleeve, and arc-shaped tooth plates with the same number as the elastic plates are formed between adjacent notches, the arc-shaped tooth plates are directly opposite to the elastic plates, and a semicircular clamp is sleeved on the inner end of the outer sleeve, a clamping head is provided in the middle of the inner side surface of the semicircular clamp, and the clamping head is matched and inserted into one of the notches; a through hole is provided on one side of the semicircular clamp, and a threaded hole is provided on the arc-shaped tooth plate corresponding to the through hole, and a screw is inserted between the threaded hole and the through hole.

8. A method for using a vehicle wheel speed measuring device according to any one of claims 1 to 7, characterized in that The steps include: The first step is to put the long holes on the faceplate on the outer ends of the bolts of each faceplate connection mechanism, then pull out the inner sleeve and put its tightening claws on the hub nut. At this time, the tightening claws will first contact the rounded corners of the outer edge of the hub nut. The outer edge of the hub nut is provided with rounded corners to facilitate the insertion of a wrench during disassembly. The guiding effect of the rounded corners can enable each tightening claw to smoothly enter the side of the hub nut and snap into the conical head. In the second step, the tightening bolts are used to press the outer sleeve inwards through the faceplate. During this process, the arc plates A of each tightening claw head contact the inner edge of the outer sleeve port. The pressing pressure of the inner edge forces the elastic plate to deform elastically inwards, and each tightening claw head shrinks inwards synchronously. The arc grooves on the outer arc plates of each tightening claw head move toward each other synchronously and clamp on the conical head of the hub nut. At the same time, the inner end of the elastic plate is tightly held on the hexagonal side of the hub nut. The axial limiting effect of the conical head and the elastic tightening force of the tightening claw head can firmly fix the faceplate connection mechanism on the hub nut, and then the faceplate is fixedly connected to the hub nut. The third step is to rotate and connect the encoder to the middle of the outer end surface of the faceplate through the coupling, and hinge the lower end of the limit rod and the connecting seat, and cover the sliding seat of the limit rod control mechanism on the upper part of the limit rod; Step 4: Adjust the distances between the three suction cups of the limit rod control mechanism to avoid the ridges or steps on the hood, suck the three suction cups tightly onto the hood, and then adjust the fastening nuts on the screws on two of the suction cups to adjust the suction cup seat to a horizontal state. At this time, the plane pair between the hinge seat and the hinge plate is in a horizontal state, and the encoder is limited and will not rotate relative to the wheel. The fifth step is to measure the rotation speed of the wheel through a relatively stationary encoder when the wheel is moving forward. When the wheel is turning, the connecting rod will produce an arc displacement with the vertical line where the rotation center of the wheel is located as the rotation center line. At this time, under the action of the plane pair and the rotation pair, the limit rod can pull the hinge plate to rotate around the vertical pin shaft and push and pull the vertical pin shaft to slide along the long hole. Therefore, the control device can be linked with the limit rod to control the limit rod, and the limit rod will not be stuck due to the turning of the wheel. The sixth step is that when the hinge plate slides in the square slide groove, the sliding surface horizontally arranged in the plane pair can provide horizontal limit for the hinge plate. Therefore, the hinge plate can limit the limit rod through the sliding seat so that it will not swing with the wheel axis as the rotation axis. When the wheel turns, the sensor can be controlled to always be in a relatively static state with the wheel, so as to realize continuous speed measurement when the wheel turns.

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