Automobile hub, fixing piece for measuring precision of annular structure and fixing method of fixing piece
Through the combination of designing pre-testing parts and fixtures, the accurate determination of the true roundness of the automobile wheel hub is achieved, the axis offset error caused by traditional fixtures is solved, and the measurement accuracy is improved.
Patent Information
- Application Number
- CN202510553463.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2025-07-11
AI Technical Summary
When fixing the car wheel hub, traditional fixtures rely on the tester's empiricality to determine whether the end surface of the wheel hub is perpendicular to the detection axis, and there is a lack of accurate determination standards, resulting in the detection results including axis offset errors, which affects the accuracy of the measurement structure.
A car hub fixing member is designed, including a pre-detection member and a fixing member. The pre-detection member is visually observed and judged by the naked eye by referring to the marking sheet. The fixing member performs multi-point positioning at both ends of the axial ends to eliminate the axis inclination caused by single-ended positioning, and uses geometric symmetry to offset the offset error.
It improves the accuracy of the measurement of the true roundness of the car wheel hub, truly reflects the true roundness, eliminates the problem of axis inclination caused by single-ended positioning, and ensures the accuracy of the detection results.
Smart Images
Figure CN120292982A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of automotive part detection, and specifically provides an automotive wheel hub, a fixing member for measuring the precision of an annular structure, and a fixing method thereof. Background Art
[0002] As an important part of a vehicle, an automotive wheel hub is mainly manufactured by casting and forging. It not only bears the weight of the vehicle but also is directly related to the vehicle's performance, endurance, safety, and aesthetics. The true roundness of an automotive wheel hub is an important indicator for measuring the shape precision of the wheel hub. It reflects the deviation degree between the actual contour of the wheel hub and an ideal circle. The definition of true roundness: The true roundness of a wheel hub refers to the radial offset between the actual contour of the wheel hub and an ideal circle, that is, the difference between the maximum radius and the minimum radius under the same center. True roundness deviation will cause problems such as vehicle vibration, deviation, and steering wheel vibration during driving. Especially at high speeds, these phenomena will be more obvious. Therefore, the quality of true roundness directly affects the driving stability, comfort of the vehicle, and the service life of the tire and suspension system. So generally, before assembling an automotive wheel hub, it is necessary to measure its true roundness.
[0003] For the true roundness detection of an automotive wheel hub, the appearance observation method can be used, that is, in a static state, carefully check whether there are obvious deformations, bumps, or scratches on the surface of the wheel hub. If the surface of the wheel hub is uneven, with local depressions or protrusions, it may mean that the wheel hub has become out of round. This method is suitable for preliminarily judging whether there are obvious deformations on the wheel hub. If there are slight deformations in the automotive wheel hub, then the appearance observation method may not be able to determine whether the wheel hub will affect the driving stability, comfort, and service life of the suspension system of the vehicle.
[0004] Then it is necessary to accurately detect the true roundness with the help of a detection instrument under dynamic conditions. When traditional fixtures fix and clamp the wheel hub, it depends on the experience of the detection master to judge whether the end face of the wheel hub is perpendicular to the detection axis. There is no accurate judgment standard. Once the phenomenon that the end face of the wheel hub is not perpendicular to the detection axis occurs, the detection result contains an axis offset error and cannot truly reflect the true roundness, thereby affecting the accuracy of the measurement result. Summary of the Invention
[0005] The purpose of the present invention is to provide an automotive wheel hub, a fixing member for measuring the precision of an annular structure, and a fixing method thereof to solve the problems raised in the above background art.
[0006] To achieve the above purpose, the present invention provides the following technical solution: An automotive wheel hub includes a wheel hub, the wheel hub having a rim, a central seat provided with an axle hole, and a plurality of spokes connecting between the rim and the central seat. A pre-detection piece detachably arranged on the end face of the central seat, the pre-detection piece having an end panel in contact with the end face of the central seat and a reference marking piece capable of making an annular movement trajectory with the central seat as the rotation center; A notch is provided on the side wall of the reference marking piece facing the rim, and scale lines distributed along the radial direction of the wheel hub are provided at the edge position of the side wall of the reference marking piece opposite to the notch. The reference marking piece moves around the edge of the rim for one circle to predict whether there is a position change of the scale line relative to the side wall of the rim edge.
[0007] In a further embodiment, a plurality of bolt holes arranged in an annular structure are pre-opened on the end face of the central seat, and an insertion end for tightly inserting into the bolt holes is provided on the side wall of the end panel.
[0008] In a further embodiment, an annular ring is rotatably sleeved on the outer wall of the radial direction of the end panel, a support rod is fixed on the outer wall of the radial direction of the annular ring, and the end of the support rod is fixedly connected with the reference marking piece.
[0009] In a further embodiment, a C-shaped elastic structure is provided at one end of the support rod close to the reference marking piece, and the elastic force of the C-shaped elastic structure pulls the reference marking piece towards the end face piece in real time.
[0010] A fixing piece for measuring the accuracy of a ring structure, used for fixing the above-mentioned automobile wheel hub, including a base, two support seats detachably installed on the base, and a cylindrical block fixed on the upper end face of the support seat; A fixed guide sleeve is fixed on the end face of one of the cylindrical blocks, and a movable guide sleeve is adjustably provided on the end face of the other cylindrical block, and the distance between the movable guide sleeve and the fixed guide sleeve is adjustable; Adjusting rings are provided at the ends of the fixed guide sleeve and the movable guide sleeve, and a plurality of positioning rods capable of sliding and adjusting along the radial direction of the adjusting ring are inserted into the radial side walls of the adjusting rings; The two adjusting rings enter from the two axial ends of the axle hole, and the positioning rods extend out along the radial direction of the adjusting ring and tightly abut against the inner walls of the two axial ends of the axle hole, and multi-point support and limit are carried out at both ends of the axle hole for correcting whether the end face of the axle hole and the detection axis are vertically distributed.
[0011] In a further embodiment, a through hole is axially opened in the movable guide sleeve, both axial ends of the through hole are of a reduced structure, and the middle is of an enlarged structure. A threaded hole is axially provided in one of the cylindrical blocks, and a threaded adjusting rod penetrates through the through hole. One end of the threaded adjusting rod is connected to the threaded hole and extends out from both axial ends of the threaded hole; The adjusting ring installed at the end of the movable guide sleeve is provided with at least two positioning rods. Both ends of the positioning rods are provided with spherical enlarged ends. There is an expanding gap between the ends of the two positioning rods located inside the adjusting ring. The other end of the threaded adjusting rod is a spherical structure and can pass through the expanding gap to adjust the positioning rods along the radial direction of the adjusting ring. A prolonging rod capable of passing through the expanding gap is fixedly connected to the spherical structure of the threaded adjusting rod. The end of the prolonging rod extends out from the shrinking structure and is fixedly connected with a front protruding block. The front protruding block enters the adjusting ring installed at the end of the fixed guide sleeve and adjusts the positioning rods along the radial direction of the adjusting ring through the expanding gap.
[0012] In a further embodiment, the fixed guide sleeve and the movable guide sleeve are coaxially distributed. Limiting pieces are fixedly arranged at the edge of the ends of the fixed guide sleeve and the movable guide sleeve. When the adjusting ring is inserted into the end of the axle hole, the limiting pieces are parallelly abutted against the side wall of the end of the axle hole.
[0013] In a further embodiment, a limiting disc located inside the expanding structure is fixedly arranged on the outer wall of one end of the threaded adjusting rod close to the spherical structure. A first spring is sleeved on the outer wall of the threaded adjusting rod. One end of the first spring is fixedly connected with the limiting disc, and the other end is fixedly connected with the inner wall of one end close to the adjusting disc inside the expanding structure.
[0014] In a further embodiment, it further includes a transmission member. The transmission member includes a flipping counterweight rod rotatably installed at the edge position of the end of one of the cylindrical blocks. A T-shaped pull rod is slidably inserted into the end of the flipping counterweight rod. The end of the T-shaped pull rod is rotationally connected with a power rod along the transverse direction. The end of the power rod is rotationally connected with a rolling transmission wheel. The rolling transmission wheel can roll on the surface of the fixed hub rim to provide rotational power.
[0015] A fixing method for the accuracy determination of the annular structure of an automotive wheel hub includes the following steps: A1. Place the wheel hub in the gap between the two adjusting rings. Then, axially adjust the threaded adjusting rod. The threaded adjusting rod drives the movable guide sleeve to adjust and feed towards the fixed guide sleeve until the two adjusting rings are inserted into the axle hole of the center seat of the wheel hub from both axial ends. A2. Then, continue to rotate the threaded adjusting rod. The threaded adjusting rod continues to adjust and feed. The front protruding block enters the adjusting ring installed at the end of the fixed guide sleeve and adjusts the positioning rods along the radial direction of the adjusting ring through the expanding gap. The positioning rods extend along the radial direction of the adjusting ring and tightly abut against the inner wall of one axial end of the axle hole. A3. At the same time, the spherical structure of the threaded adjusting rod can pass through the expanding gap to adjust the other inner wall of the positioning rods along the radial direction of the adjusting ring. Thus, the positioning rods radially arranged on the two adjusting rings respectively perform multi-point support and limit at both ends of the axle hole.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: When the automobile wheel hub of the present invention is subject to factory quality inspection, the true roundness can be visually observed and judged through the equipped pre-detection piece. Subsequently, by using the fixing piece to position the axial ends of the axle hole of the center seat, the problem of axis inclination caused by single-end positioning can be eliminated. By applying positioning constraints simultaneously at both axial ends of the axle hole, the offset error of single-end positioning can be offset by geometric symmetry, improving the measurement accuracy of true roundness and truly reflecting the true roundness. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a schematic structural diagram of the wheel hub main body of the present invention; Figure 2 is a schematic exploded structural diagram of the wheel hub and the pre-detection piece of the present invention; Figure 3 is a schematic structural diagram of a further improvement of the pre-detection piece of the present invention; Figure 4 is a schematic main body structural diagram of the fixing piece of the present invention; Figure 5 is a sectional view of the assembled structure of the moving guide sleeve, the threaded adjusting rod and the push block of the present invention; Figure 6 of the present invention Figure 5 is an enlarged view of the structure at A in; Figure 7 is a schematic assembled structural diagram of the fixed guide sleeve and the limit piece of the present invention; Figure 8 is a schematic exploded partial structural diagram of the base, the fastening bolt and the fastening block of the present invention; Figure 9 is a schematic assembled structural diagram of one of the support seats and the transmission member of the present invention; Figure 10 is a sectional view of the side view structure of the transmission member of the present invention; Figure 11 is a schematic diagram of the flipping adjustment of the transmission member of the present invention.
[0018] In the figure: 1. Base; 11. Support beam; 12. Inverted T-shaped adjustment groove; 2. Support seat; 21. Fastening bolt; 22. Fastening block; 3. Cylindrical block; 4. Fixed guide sleeve; 5. Moving guide sleeve; 51. Threaded adjusting rod; 52. Front protruding block; 53. Extension rod; 54. Limit disc; 6. Limit piece; 61. Adjusting ring; 62. Positioning rod; 7. Wheel hub; 71. Ring; 72. End panel; 73. Insertion end; 74. Support rod; 75. Reference marking piece; 8. Flipping counterweight rod; 81. T-shaped pull rod; 82. Power rod; 83. Rolling transmission wheel. DETAILED DESCRIPTION OF THE INVENTION
[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0020] Embodiment. This embodiment provides an automobile wheel hub, including a wheel hub 7, as Figure 1 and Figure 2 shown. The wheel hub 7 has a rim, a central seat provided with an axle hole, and a plurality of spokes connecting between the rim and the central seat.
[0021] It also discloses a pre-detection piece detachably arranged on the end face of the central seat. The pre-detection piece has an end panel 72 in contact with the end face of the central seat and a reference marking piece 75 capable of making a circular motion trajectory with the central seat as the rotation center. Specifically, as Figure 2 and Figure 3 shown, an annular ring 71 is rotatably sleeved on the outer wall of the radial direction of the end panel 72. A support rod 74 is fixed on the outer wall of the radial direction of the annular ring 71. The end of the support rod 74 is fixedly connected to the reference marking piece 75. At the same time, a plurality of bolt holes arranged in an annular structure are pre-opened on the end face of the central seat, and an insertion end 73 for tightly inserting into the bolt hole is provided on the side wall of the end panel 72.
[0022] When assembling the pre-detection piece and the central seat, a plurality of insertion ends 73 (at least 2, 3 or 5 insertion ends 73) are tightly inserted into the corresponding bolt holes of the central seat. Here, the tip position of the insertion end 73 is set as a spherical structure or a reduced structure to facilitate insertion into the bolt hole. As the insertion end 73 is continuously inserted, finally, when the end panel 72 contacts the end face of the central seat, stop further insertion. At the same time, the notch of the reference marking piece 75 is attached to the side wall of the rim edge of the wheel hub 7. A notch is provided on the side wall of the reference marking piece 75 facing the rim, and scale lines distributed along the radial direction of the wheel hub 7 are provided at the edge position of the side wall of the reference marking piece 75 opposite to the notch. When the wheel hub 7 is subject to factory quality inspection, the true roundness is visually judged through the equipped pre-detection piece. As Figure 1 shown, at this time, the reference marking piece 75 is located at the highest position of the wheel hub 7. Move the reference marking piece 75 along the edge of the rim for one circle. During the movement of the reference marking piece 75, roll the wheel hub 7 on a relatively flat ground synchronously to avoid the reference marking piece 75 touching the ground and avoid blocking the observation line of sight, affecting the tester's observation of the position of the side wall of the rim edge of the wheel hub 7 relative to the scale line.
[0023] For example, if the rim edge sidewall cannot remain at the same horizontal height as the zero scale line of the scale line during one revolution of the reference marker piece 75 relative to the hub 7, then it is predicted that the hub 7 has obvious deformation.
[0024] If the rim edge sidewall remains at the same horizontal height as the zero scale line of the scale line during one revolution of the reference marker piece 75 relative to the hub 7, then it is predicted that the hub 7 has no obvious deformation. Subsequently, the insertion end 73 is pulled out from the bolt hole, and the pre-detection part can be separated from the hub 7. Then, the true roundness of the hub 7 is precisely detected.
[0025] As Figure 3 shown, further, in this embodiment, one end of the support rod 74 close to the reference marker piece 75 is provided with a C-shaped elastic structure, and the elastic force of the C-shaped elastic structure pulls the reference marker piece 75 towards the end face piece in real time. The first purpose of this move is to make the inner wall of the notch of the reference marker piece 75 closely fit on the rim edge sidewall of the hub 7. During the circular motion trajectory of the reference marker piece 75, it is possible to avoid the problem of low detection accuracy caused by the reference marker piece 75 jumping during its own movement. The advantage of this is that it is possible to design only one pre-detection part to match different sizes of hubs 7 for pre-detection operations.
[0026] This embodiment also discloses a fixing part for measuring the accuracy of a ring structure, which is used to fix an automobile hub, as Figure 4 and Figure 8 shown, including a base 1, two support seats 2 detachably installed on the base 1, and a cylindrical block 3 fixed on the upper end face of the support seat 2; two inverted T-shaped adjustment grooves 12 are opened on the upper end face of the base 1, and at the same time, two support beams 11 located between the two inverted T-shaped adjustment grooves 12 are arranged on the upper end face of the base 1. The two support seats 2 are distributed in parallel on the upper end faces of the two support beams 11. At the same time, an installation hole is opened on the bottom wall of the support seat 2, and a fastening bolt 21 is inserted into the installation hole. The bottom end of the fastening bolt 21 passes through the installation hole and enters the corresponding inverted T-shaped adjustment groove 12 and is threadedly connected with a fastening block 22 of an inverted T-shaped structure. The fastening block 22 is slidably clamped with the inverted T-shaped adjustment groove 12. When the bottom end of the fastening bolt 21 is tightly threadedly connected with the fastening block 22, that is, when the fastening bolt 21 cannot be rotated any further, at this time, the top wall of the fastening block 22 can be tightly pressed against the inner top wall of the inverted T-shaped adjustment groove 12. In this way, the support seat 2 can be stably installed on the upper end faces of the two support beams 11 and is not prone to lateral sliding and position change.
[0027] One end face of one of the cylindrical blocks 3 is fixedly provided with a fixed guide sleeve 4, and the end face of the other cylindrical block 3 is adjustably provided with a movable guide sleeve 5. The distance between the movable guide sleeve 5 and the fixed guide sleeve 4 is adjustable; adjustment rings 61 are provided at the ends of both the fixed guide sleeve 4 and the movable guide sleeve 5, and a plurality of positioning rods 62 capable of sliding and adjusting along the radial direction of the adjustment ring 61 are inserted into the radial side walls of the adjustment rings 61.
[0028] Specifically, as Figure 5 and Figure 6 shown, the movable guide sleeve 5 is axially provided with a through hole. Both axial ends of the through hole are of reduced structures, and the middle is of an enlarged structure. One of the cylindrical blocks 3 is axially provided with a threaded hole, and a threaded adjusting rod 51 passes through the through hole. One end of the threaded adjusting rod 51 is connected to the threaded hole and extends from both axial ends of the threaded hole.
[0029] At the same time, the adjustment ring 61 installed at the end of the movable guide sleeve 5 is provided with at least two positioning rods 62. Both ends of the positioning rods 62 are provided with spherical enlarged ends. As Figure 6 shown, the positioning rods 62 together with the spherical enlarged ends located outside the adjustment ring 61 can be retracted and embedded into the surface wall of the adjustment ring 61, so as not to affect the smooth insertion of the adjustment ring 61 into the end of the axle hole of the wheel hub. At the same time, there is an expansion gap between one ends of the two positioning rods 62 located inside the adjustment ring 61. The size of the expansion gap is as Figure 7 shown as L. The other end of the threaded adjusting rod 51 is of a spherical surface structure and can pass through the expansion gap, and can adjust the positioning rods 62 along the radial direction of the adjustment ring 61. A prolongation rod 53 that can pass through the expansion gap is fixedly connected to the spherical surface structure of the threaded adjusting rod 51. The end of the prolongation rod 53 extends out from the reduced structure and is fixedly connected with a front protruding block 52. The front protruding block 52 enters the adjustment ring 61 installed at the end of the fixed guide sleeve 4, and adjusts the positioning rods 62 along the radial direction of the adjustment ring 61 through the expansion gap. During this process, the positioning rods 62 that can be radially inserted into the two adjustment rings 61 can be pushed out along the radial direction for multi-point constraint on both axial ends of the axle hole of the center seat of the wheel hub 7. Since both ends of the positioning rods 62 are provided with spherical enlarged ends, the front protruding block 52 or the spherical surface structure can slide along the outer wall of the spherical enlarged end and push the spherical enlarged end together with the positioning rods 62 to adjust along the radial direction.
[0030] The specific constraint operation is to place the wheel hub 7 in the gap between the two adjustment rings 61, and then axially adjust the threaded adjusting rod 51. The threaded adjusting rod 51 drives the movable guide sleeve 5 to adjust and feed towards the fixed guide sleeve 4 until the two adjustment rings 61 are inserted into both axial ends of the axle hole of the center seat of the wheel hub 7.
[0031] Subsequently, continue to rotate the threaded adjusting rod 51. The threaded adjusting rod 51 continues to feed and adjust. The front protruding block 52 enters the adjusting ring 61 installed at the end of the fixed guide sleeve 4, and through the expansion gap, the positioning rod 62 is adjusted along the radial direction of the adjusting ring 61. The positioning rod 62 extends along the radial direction of the adjusting ring 61 and tightly abuts against the inner wall at one axial end of the axle hole. At the same time, the spherical structure of the threaded adjusting rod 51 can pass through the expansion gap to adjust the other inner wall of the positioning rod 62 along the radial direction of the adjusting ring 61. Thus, the positioning rods 62 radially arranged on the two adjusting rings 61 respectively perform multi-point support and limit at both ends of the axle hole. By using the method of positioning at both axial ends of the axle hole, the problem of axis inclination caused by single-end positioning can be eliminated. By applying positioning constraints simultaneously at both axial ends of the axle hole and using geometric symmetry to offset the offset error of single-end positioning, the perpendicular distribution of the axle hole end face and the detection axis can be ensured, thereby improving the accuracy of the roundness detection in the later stage.
[0032] And, as Figure 4 shown, the fixed guide sleeve 4 and the movable guide sleeve 5 are coaxially distributed. Limiting pieces 6 are fixed at the end edges of both the fixed guide sleeve 4 and the movable guide sleeve 5. When the adjusting ring 61 is inserted into the end of the axle hole, the limiting pieces 6 are parallel to and abut against the side wall at the end of the axle hole, so as to use the two limiting pieces 6 to abut against both axial end faces of the axle hole to prevent the hub 7 from slipping laterally and affecting the roundness detection.
[0033] In the above structure, as Figure 5 shown, a limiting disc 54 located inside the enlarged structure is fixed on the outer wall of one end of the threaded adjusting rod 51 close to the spherical structure. A first spring is sleeved on the outer wall of the threaded adjusting rod 51. One end of the first spring is fixedly connected to the limiting disc 54, and the other end is fixedly connected to the inner wall of one end of the enlarged structure close to the adjusting disc. By using the elastic force of the first spring, the movable guide sleeve can be quickly moved closer to the fixed guide sleeve 4.
[0034] It also includes a transmission member, such as Figure 9 、 Figure 10 and Figure 11As shown, the transmission member includes a flip counterweight rod 8 rotatably mounted at the edge position of one of the columnar blocks, a T-type pull rod 81 is slidably inserted at the end of the flip counterweight rod 8, and the end of the T-type pull rod 81 is connected to a power rod 82 along the lateral rotation, and the end of the power rod 82 is rotatably connected to a rolling transmission wheel 83. A motor can be installed at one end of the power rod 82 close to the T-type pull rod 81, and the output end of the motor passes through the T-type pull rod 81 and is connected to the power rod 82 to provide rolling power for the rolling transmission wheel 83. Then, by flipping around the rotation position between the flip counterweight rod 8 and the columnar block 3, the T-type pull rod 81 and the power rod 82 can be used as a linkage to roll the rolling transmission wheel 83 on the surface wall of the fixed wheel hub 7 to provide rotational power, thereby providing power for the rolling detection of the true roundness of the wheel hub 7. Of course, it is also possible to detect by manually moving the wheel hub 7 to roll. At the same time, the T-type pull rod 81 can slide relative to the flip counterweight rod 8 to adjust the relative position of the rolling transmission wheel 82, so as to transmit the wheel hub 7 of different sizes.
[0035] In summary, the present invention utilizes a fixing member to position the two axial ends of the axle hole of the center seat. Positioning at both ends can eliminate the problem of axis inclination caused by single-end positioning, improve the accuracy of roundness measurement, and truly reflect the roundness.
[0036] The present invention also discloses a fixing method for measuring the precision of the annular structure of an automobile wheel hub, and the fixing member for measuring the precision of the annular structure comprises the following steps: A1. Place the wheel hub 7 in the gap between the two adjustment rings 61, then axially adjust the threaded adjustment rod 51, which drives the movable guide sleeve 5 to adjust and feed toward the fixed guide sleeve 4 until the two adjustment rings 61 are inserted from the axial ends of the center seat axle hole of the wheel hub 7; A2. Then continue to rotate the threaded adjustment rod 51, the threaded adjustment rod 51 continues to be fed and adjusted, the forward protrusion 52 enters the adjustment ring 61 installed at the end of the fixed guide sleeve 4, and adjusts the positioning rod 62 along the radial direction of the adjustment ring 61 through the expansion gap, and the positioning rod 62 extends along the radial direction of the adjustment ring 61 and tightly abuts against the inner wall of one axial end of the axle hole; A3. At the same time, the spherical structure of the threaded adjustment rod 51 can pass through the expansion gap, and the positioning rod 62 is adjusted along the radial direction of the adjustment ring 61. At this point, the two adjustment rings 61 are radially arranged with positioning rods 62 to perform multi-point support and limit at both ends of the axle hole.
[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An automobile wheel hub, characterized in that, Comprising: A wheel hub (7), the wheel hub (7) having a rim, a central seat provided with an axle hole, and a plurality of spokes connecting the rim and the central seat; A pre-detection member detachably arranged on the end face of the central seat, the pre-detection member having an end panel (72) in contact with the end face of the central seat and a reference marking piece (75) capable of making an annular movement trajectory with the central seat as the rotation center; A notch is provided on the side wall of the reference marking piece (75) facing the rim, scale lines are provided at the position of the side wall edge of the reference marking piece (75) opposite to the notch and distributed along the radial direction of the wheel hub (7). The reference marking piece (75) moves around the edge of the rim for one circle to predict whether there is a position change of the scale line relative to the side wall of the rim edge.
2. The automotive wheel according to claim 1, characterized in that, A plurality of bolt holes arranged in an annular structure are pre-opened on the end face of the central seat, and an insertion end (73) for tightly inserting into the bolt holes is provided on the side wall of the end panel (72).
3. The automotive wheel according to claim 1, characterized in that, An annular ring (71) is rotatably sleeved on the outer wall of the radial direction of the end panel (72), a support rod (74) is fixed on the outer wall of the radial direction of the annular ring (71), and the end of the support rod (74) is fixedly connected with the reference marking piece (75).
4. The automotive wheel according to claim 1, wherein, One end of the support rod (74) close to the reference marking piece (75) is provided with a C-shaped elastic structure, and the elastic force of the C-shaped elastic structure pulls the reference marking piece (75) towards the end face piece in real time.
5. A fixture for measuring the accuracy of a ring structure, which is used to fix an automotive wheel hub (7) according to any one of claims 1-4, characterized in that, Comprising a base (1), two support seats (2) detachably installed on the base (1), and a cylindrical block (3) fixed on the upper end face of the support seats (2); A fixed guide sleeve (4) is fixed on the end face of one of the cylindrical blocks (3), and a movable guide sleeve (5) is adjustably arranged on the end face of the other cylindrical block (3), and the distance between the movable guide sleeve (5) and the fixed guide sleeve (4) is adjustable; Adjusting rings (61) are provided at the ends of the fixed guide sleeve (4) and the movable guide sleeve (5), and a plurality of positioning rods (62) capable of sliding and adjusting along the radial direction of the adjusting ring (61) are inserted into the radial side walls of the adjusting rings (61); The two adjusting rings (61) enter from the axial two ends of the axle hole, and the positioning rods (62) extend out along the radial direction of the adjusting ring (61) and tightly abut against the inner walls of the axial two ends of the axle hole, and multi-point support and limit are carried out at both ends of the axle hole to correct whether the end face of the axle hole and the detection axis are vertically distributed.
6. The fixture for measuring the accuracy of the ring structure according to claim 5, characterized in that, A through hole is axially opened in the movable guide sleeve (5), both axial ends of the through hole are of a reduced structure, and the middle is of an enlarged structure. A threaded hole is axially provided in one of the cylindrical blocks (3), and a threaded adjusting rod (51) penetrates through the through hole. One end of the threaded adjusting rod (51) is connected to the threaded hole and extends out from both axial ends of the threaded hole; The adjusting ring (61) installed at the end of the movable guide sleeve (5) is provided with at least two positioning rods (62). Both ends of the positioning rods (62) are provided with spherical enlarged ends, and an expansion gap is provided between one ends of the two positioning rods (62) located inside the adjusting ring (61). The other end of the threaded adjusting rod (51) is of a spherical structure and can pass through the expansion gap to adjust the positioning rods (62) along the radial direction of the adjusting ring (61); A spherical structure of the threaded adjusting rod (51) is fixedly connected with an extension rod (53) capable of passing through the expansion gap. An end of the extension rod (53) extends out of the reduced structure and is fixedly connected with a front protruding block (52). The front protruding block (52) enters an adjusting ring (61) installed at an end of the fixed guide sleeve (4), and the positioning rod (62) is adjusted along the radial direction of the adjusting ring (61) through the expansion gap.
7. The fixture for measuring the accuracy of the ring structure according to claim 5, characterized in that, The fixed guide sleeve (4) and the moving guide sleeve (5) are coaxially distributed. Limiting pieces (6) are fixedly arranged at the edge of the end of the fixed guide sleeve (4) and the moving guide sleeve (5). When the adjusting ring (61) is inserted into the end of the axle hole, the limiting pieces (6) are parallelly abutted against the side wall of the end of the axle hole.
8. The fixture for ring structure precision measurement according to claim 6, wherein, A limiting disc (54) located in the enlarged structure is fixedly arranged on an outer wall of one end of the threaded adjusting rod (51) close to the spherical structure. A first spring is sleeved on the outer wall of the threaded adjusting rod (51). One end of the first spring is fixedly connected with the limiting disc (54), and the other end is fixedly connected with an inner wall of one end close to the adjusting disc in the enlarged structure.
9. The fixture for measuring the accuracy of a ring structure according to claim 5, characterized in that, It further includes a transmission member. The transmission member includes a flipping counterweight rod (8) rotatably installed at an edge position of an end of one of the cylindrical blocks. A T-shaped pull rod (81) is slidably inserted into an end of the flipping counterweight rod (8). An end of the T-shaped pull rod (81) is rotatably connected with a power rod (82) along the transverse direction. An end of the power rod (82) is rotatably connected with a rolling transmission wheel (83). The rolling transmission wheel (83) can roll on the surface of the rim of the fixed hub (7) to provide rotational power.
10. A fixing method for measuring the accuracy of the annular structure of an automobile wheel hub. The fixing member for measuring the accuracy of the annular structure according to claim 5, characterized in that, It includes the following steps: A1. Place the hub (7) in the gap between the two adjusting rings (61), and then axially adjust the threaded adjusting rod (51). The threaded adjusting rod (51) drives the moving guide sleeve (5) to adjust and feed towards the fixed guide sleeve (4) until the two adjusting rings (61) are inserted into the axle hole at both axial ends of the central seat of the hub (7). A2. Then continue to rotate the threaded adjusting rod (51). The threaded adjusting rod (51) continues to adjust and feed. The front protruding block (52) enters the adjusting ring (61) installed at the end of the fixed guide sleeve (4), and the positioning rod (62) is adjusted along the radial direction of the adjusting ring (61) through the expansion gap. The positioning rod (62) extends out along the radial direction of the adjusting ring (61) and tightly abuts against an inner wall at one axial end of the axle hole. A3. At the same time, the spherical structure of the threaded adjusting rod (51) can pass through the expansion gap to adjust the other inner wall of the positioning rod (62) along the radial direction of the adjusting ring (61). Thus, the positioning rods (62) radially arranged on the two adjusting rings (61) respectively perform multi-point support and limitation at both ends of the axle hole.