Device for detecting position degree of bearing of protective tube of steering column

Abstract

A steering column protection tube bearing position degree detection device relates to a detection device in the automobile part processing field, and comprises a positioning mechanism and a detection mechanism installed on the positioning mechanism, the detection mechanism comprises a gauge body, a detection block, an upper fixing sleeve and a dial indicator; the dial indicator is installed at the upper end of the upper fixing sleeve through a dial indicator fixing seat, the lower end of the upper fixing sleeve is connected with the gauge body, a detection groove is formed in the middle of the gauge body, the detection block is installed in the detection groove and hinged to the gauge body through a pin shaft III, and a spherical protrusion is arranged at the lower end of the detection block and makes contact with the inner hole wall of a bearing to be detected. The top end face of the detection block is in contact with the measuring end of the dial indicator through a transmission rod I penetrating through the gauge body and a transmission rod II penetrating through the dial indicator fixing seat in sequence, and the lower end of the gauge body is installed on the positioning mechanism. The device can detect the coaxiality of the inner diameter of the steering column protection tube and the bearing, and has the characteristics of high production efficiency, high precision, reliable performance, convenience in quality control and high universality.

Description

Technical Field

[0001] The invention relates to a detection device in the field of automobile parts processing, in particular to a steering column guard tube bearing position detection device. Background Art

[0002] Electronic power steering systems are now widely used in the new energy vehicle industry. These systems primarily consist of a steering column assembly, steering shaft assembly, torsion sensor, servo motor, and electronic control unit, each of which plays a key role. The steering column assembly plays a crucial role in transmitting steering torque, integrating sensor functions, providing support and positioning, and connecting the power steering motor. The steering column guard tube bearing within the steering column assembly plays a crucial role in the vehicle's steering system. Its proper operation is crucial for ensuring driving control and safety. This bearing fits tightly with the steering shaft, requiring high coaxiality. However, commercially available internal micrometers can only measure the internal diameter, not the coaxiality between the bearing and the internal diameter of the steering column guard tube. Existing manufacturers typically perform random product inspections using three-dimensional coordinate measurement (CMM), a labor-intensive and inefficient method. This method can easily lead to substandard products entering the market, impacting vehicle performance. Furthermore, CMM is inefficient and struggles to meet market production demands. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a steering column guard tube bearing position detection device to detect the coaxiality between the inner diameter of the steering column guard tube and the bearing and improve production efficiency.

[0004] The technical solution to solve the above technical problems is: a steering column guard tube bearing position detection device, including a positioning mechanism and a detection mechanism installed on the positioning mechanism, the detection mechanism includes a gauge body, a detection block, an upper fixed sleeve, and a dial indicator; the dial indicator is installed on the upper end of the upper fixed sleeve through a dial indicator fixing seat, and the lower end of the upper fixed sleeve is connected to the gauge body. A detection groove is opened in the middle of the gauge body, and the detection block is installed in the detection groove. The detection block is hinged to the gauge body through a pin shaft III, and a spherical protrusion is provided at the lower end of the detection block. The spherical protrusion contacts the inner hole wall of the bearing to be tested, and the top end face of the detection block contacts the measuring end of the dial indicator through a transmission rod I passing through the gauge body and a transmission rod II passing through the dial indicator fixing seat in sequence. The lower end of the gauge body is installed on the positioning mechanism.

[0005] A further technical solution of the present invention is: the inner hole of the upper fixing sleeve and the outer cylindrical surface of the lower end of the dial indicator fixing seat are rotatably connected through a bearing; the dial indicator fixing seat is also equipped with guide sleeves II at the upper and lower ends of its transmission rod passing through hole II, and the gauge body is equipped with a guide sleeve I at the upper end of its transmission rod passing through hole I.

[0006] A further technical solution of the present invention is that the dial end of the dial indicator is mounted on the dial indicator outer fixing seat, the measuring end of the dial indicator is mounted on the upper end of the dial indicator fixing seat through the dial indicator fixing piece, and is locked by the dial indicator locking piece.

[0007] A further technical solution of the present invention is: the positioning mechanism includes a lower mounting seat, a sliding sleeve, a connecting rod, and an upper fixed seat, the upper fixed seat and the lower mounting seat are respectively provided with pin holes along the horizontal direction, the connecting rod is a variable cross-section structure with a thick middle and thin ends, the upper fixed seat and the lower mounting seat are respectively connected to the connecting rod by pin I and pin II passing through the pin holes; the sliding sleeves are also respectively installed between the upper fixed seat, the lower mounting seat and the middle section of the connecting rod, and a linear spring is installed between the sliding sleeve and the end face of the middle section of the connecting rod, and elastic positioning components for cooperating with the inner hole wall of the steering column guard tube are respectively installed on the outer circumference of the sliding sleeve adjacent to the upper fixed seat and the lower mounting seat.

[0008] A further technical solution of the present invention is: the elastic positioning assembly includes a retainer and a steel ball, the retainer is respectively installed on the outer circumference of the sliding sleeve and the upper fixed seat and the outer circumference of the sliding sleeve and the lower mounting seat, and the steel ball is installed on the retainer.

[0009] A further technical solution of the present invention is: the detection device also includes a calibration mechanism, which includes a calibration sleeve I and a calibration sleeve II. The calibration sleeve II is fixed to the upper end of the calibration sleeve I. The inner hole of the calibration sleeve I is matched with the outer circle of the lower mounting seat, the sliding sleeve, the middle section of the connecting rod, and the lower end of the upper fixed seat from bottom to top, and the calibration sleeve II is matched with the outer circle of the upper end of the upper fixed seat.

[0010] A further technical solution of the present invention is: the detection device also includes a base, the base includes a bottom plate, a detection mechanism mounting seat I, a detection mechanism mounting seat II, and anchor columns; the bottom plate is fixed to the ground through the anchor columns, the detection mechanism mounting seat I and the lower mounting seat are respectively fixed on the bottom plate, the detection mechanism mounting seat II is fixed on the detection mechanism mounting seat I, and the inner holes of the detection mechanism mounting seat I and the detection mechanism mounting seat II respectively cooperate with the lower end of the gauge body when not detected.

[0011] A further technical solution of the present invention is: the base also includes a calibration mechanism storage seat, which is fixed on the bottom plate and cooperates with the lower end of the calibration sleeve I.

[0012] A further technical solution of the present invention is that the base further includes limiting columns, which are installed on both sides of the lower mounting seat.

[0013] Due to the above structure, the steering column guard tube bearing position detection device of the present invention has the following beneficial effects compared with the prior art: 1. Can detect the coaxiality between the inner diameter of the steering column guard tube and the bearing The present invention includes a positioning mechanism and a detection mechanism installed on the positioning mechanism, wherein the detection mechanism includes a gauge body, a detection block, an upper fixed sleeve, and a dial indicator; the dial indicator is installed on the upper end of the upper fixed sleeve through a dial indicator fixing seat, and the lower end of the upper fixed sleeve is connected to the gauge body. A detection groove is opened in the middle of the gauge body, and a detection block is installed in the detection groove. The detection block is hinged to the gauge body through a pin shaft III, and a spherical protrusion is provided at the lower end of the detection block. The spherical protrusion contacts the inner hole wall of the bearing to be tested, and the top end face of the detection block contacts the measuring end of the dial indicator through a transmission rod I passing through the gauge body and a transmission rod II passing through the dial indicator fixing seat in sequence. Therefore, the detection mechanism of the present invention uses the lever principle to convert the X-direction displacement into the Z-direction position, that is, when the detection block rotates with the gauge body, the spherical protrusion of the detection block begins to detect the circumferential surface of the inner hole wall of the bearing to be tested. When there is a jump, the pin shaft III located on the detection block is used as the rotation origin, and the upper end of the detection block will rise or fall, and be transmitted to the dial indicator through the transmission rod I and the transmission rod II. In this way, the dial indicator can read the Z-direction displacement, which is the coaxiality between the inner diameter of the steering column guard tube and the bearing. The coaxiality is half of the position. A reading within 0.25 mm can meet the requirements, thereby solving the problem that the dial indicator cannot measure the bearing position.

[0014] 2. High production efficiency During detection, the present invention only needs to rotate the gauge body to read the coaxiality between the inner diameter of the steering column guard tube and the bearing through the dial indicator. The operation is very convenient and the production efficiency can be greatly improved.

[0015] 3. High precision The positioning mechanism of the present invention has elastic positioning assemblies mounted on the outer circumferences adjacent to the upper and lower mounting seats, each of which is designed to engage with the inner wall of the steering column guard tube. The elastic positioning assemblies include a retaining frame and steel balls. The present invention utilizes two rows of elastic positioning assemblies, one above the other, to position the workpiece and prevent it from wobbling. Furthermore, linear springs are installed between the upper and lower sleeves and the end faces of the middle section of the connecting rod, allowing the sleeves to move up and down during assembly. This allows the steel balls to contract, resulting in a range within which the positioning diameter can vary. This results in higher positioning accuracy for the elastic positioning assemblies, preventing them from loosening and significantly improving the accuracy of the inspection fixture.

[0016] In addition, the present invention also includes a calibration mechanism, which includes a calibration sleeve I and a calibration sleeve II, wherein the calibration sleeve I is used to simulate the sliding fit between the inner hole of the steering column guard tube and the positioning mechanism through the hole axis; and then the dial indicator is reset to zero by contacting the calibration sleeve II with the detection block to achieve the purpose of calibration, and the coaxiality of the calibration mechanism reaches within 0.02 mm.

[0017] 4. Reliable performance The present invention adopts an upper and lower row of steel ball telescopic structures to position the workpiece to prevent the workpiece from shaking. In addition, a linear spring is installed between the sliding sleeves at the upper and lower ends and the end face of the middle section of the connecting rod, so that the sliding sleeve can move up and down during the assembly process of the present invention. In this way, the steel balls can shrink, causing the positioning diameter to change within a certain range, thereby playing a better positioning role, and will not scratch the product, avoiding the risk of the workpiece scratching the inner wall of the part during the assembly process.

[0018] 5. Facilitate product quality control During detection, the present invention converts radial displacement into axial displacement through the principle of a lever mechanism, and reads the specific value of the axial displacement through a dial indicator, which makes it easier to control product quality.

[0019] 6. High versatility This invention uses a retractable elastic positioning component with steel balls to enable products with different inner diameters of steering column guard tubes to share the same inspection fixture, meeting the requirements of platformization and having high versatility.

[0020] The technical features of a steering column guard tube bearing position detection device of the present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 : A schematic diagram of the three-dimensional structure of a steering column guard tube bearing position detection device of the present invention, Figure 2 : A front sectional view of a steering column guard tube bearing position detection device of the present invention with a workpiece to be measured installed, Figure 3 : Figure 2 Left view of Figure 4 : Figure 2 A top view of Figure 5 : Figure 4 AA cross-sectional view; Figure 6 : A schematic diagram of the three-dimensional structure of a steering column guard tube bearing position detection device according to the present invention, which is equipped with a workpiece to be measured and does not include a calibration mechanism. Figure 7 : A schematic diagram of the three-dimensional structure of a steering column guard tube bearing position detection device of the present invention without a calibration mechanism, Figure 8 : Figure 9 Right view, Figure 9 : The main view of the gauge body in Example 1, Figure 10 : Figure 9 BB cross-sectional view, Figure 11 : Figure 9 CC cross-sectional view, Figure 12 : Schematic diagram of the three-dimensional structure of the gauge body in Example 1; Figure 13 : The main view of the detection block in Example 1, Figure 14 : Figure 13 Left view of; In the above drawings, the descriptions of the reference numerals are as follows: Positioning mechanism, 11- lower mounting seat, 12- retaining frame, 13- sliding sleeve, 14- connecting rod, 15-upper fixed seat, 16-pin shaft I, 17-pin shaft II, 18-steel ball, 19-linear spring; Detection mechanism, 21- gauge body, 2101- detection groove, 22- detection block, 221- spherical protrusion, 23-pin shaft III, 24-transmission rod I, 25-upper fixed sleeve, 26-guide sleeve I, 27-dial indicator fixed seat, 28-guide sleeve II, 29-bearing fixed sleeve 29, 210-transmission rod II, 211-external fixed sealing plate, 212- dial indicator fixing piece, 213- dial indicator locking piece, 214- dial indicator external fixing seat, 215- dial indicator, 216-deep groove ball bearing; 3-calibration mechanism, 31-calibration sleeve I, 32-calibration sleeve II, 4-base, 41-bottom plate, 42-detection mechanism mounting seat I, 43-detection mechanism mounting seat II, 44-limiting column, 45-Calibration mechanism storage seat, 46-foot column, 5-steering column protective tube, 51-bearing workpiece. DETAILED DESCRIPTION Example 1

[0022] A device for detecting the position of a steering column guard tube bearing comprises a positioning mechanism 1, a detection mechanism 2, a calibration mechanism, and a base, wherein: The positioning mechanism 1 includes a lower mounting seat 11, a sliding sleeve 13, a connecting rod 14, and an upper fixed seat 15. The upper fixed seat 15 and the lower mounting seat 11 are respectively provided with a pin hole in the transverse direction. The connecting rod 14 is a variable cross-section structure with a thick middle and thin ends. The upper fixed seat 15 and the lower mounting seat 11 are respectively connected to the connecting rod 14 by a pin I 16 and a pin II 17 passing through the pin hole; the sliding sleeve 13 is also installed between the middle section of the upper fixed seat 15, the lower mounting seat 11 and the connecting rod 14, and a linear spring 19 is installed between the sliding sleeve 13 and the end surface of the middle section of the connecting rod 14. Elastic positioning assemblies for engaging with the inner wall of the steering column guard tube are mounted on the outer circumferences of the sleeve adjacent to the upper fixing seat 15 and the lower mounting seat 11. The elastic positioning assemblies include a retainer 12 and a steel ball 18. The retainer 12 is mounted on the outer circumferences of the sleeve and the upper fixing seat 15, and the outer circumference of the sleeve and the lower mounting seat 11, respectively. The steel ball 18 is mounted on the retainer 12. The present invention uses two rows of elastic positioning assemblies, one above the other, to position the workpiece, preventing it from shaking. Furthermore, a linear spring allows the sleeve to move up and down during assembly, and the steel ball can shrink, resulting in a range within which the positioning diameter can vary. This improves the positioning accuracy of the elastic positioning assemblies and prevents scratching the workpiece.

[0023] The detection mechanism 2 includes a gauge body 21, a detection block 22, an upper fixed sleeve 25, and a dial indicator 215; the dial indicator 215 is installed on the upper end of the upper fixed sleeve 25 through the dial indicator fixing seat 27, and the lower end of the upper fixed sleeve 25 is connected to the gauge body 21. A detection groove 2101 is opened in the middle of the gauge body 21, and the detection block 22 is installed in the detection groove 2101. The detection block 22 is hinged to the gauge body 21 through the pin shaft III 23, and the lower end of the detection block 22 is provided with a spherical protrusion 221, which contacts the inner hole wall of the bearing to be tested. The top end face of the detection block 22 contacts the measuring end of the dial indicator 215 through the transmission rod I 24 passing through the gauge body 21 and the transmission rod II 210 passing through the dial indicator fixing seat 27 in sequence. The lower end of the gauge body 21 is installed on the upper fixed seat 15 of the positioning mechanism 1.

[0024] The inner hole of the upper fixing sleeve 25 and the outer cylindrical surface of the lower end of the dial indicator fixing seat 27 are rotatably connected through two deep groove ball bearings 216, and a bearing fixing sleeve 29 is installed between the two deep groove ball bearings 216; the dial indicator fixing seat 27 is also equipped with guide sleeves II 28 at the upper and lower ends of its transmission rod passing through hole II, and the gauge body 21 is equipped with a guide sleeve I 26 at the upper end of its transmission rod passing through hole I.

[0025] The dial end of the dial indicator 215 is installed on the dial indicator external fixing seat 214, and the detection end of the dial indicator 215 is installed with an external fixed sealing plate 211. The measuring end of the dial indicator 215 is installed on the upper end of the dial indicator fixing seat 27 through the dial indicator fixing piece 212 and locked by the dial indicator locking piece 213.

[0026] The calibration mechanism 3 includes a calibration sleeve I 31 and a calibration sleeve II 32. The calibration sleeve II 32 is fixed to the upper end of the calibration sleeve I 31. The inner hole of the calibration sleeve I 31 matches with the outer circle of the lower mounting seat 11, the sliding sleeve 13, the middle section of the connecting rod 14, and the lower end of the upper fixed seat 15 from bottom to top. The calibration sleeve II 32 matches with the outer circle of the upper end of the upper fixed seat 15.

[0027] The base 4 includes a bottom plate 41, a detection mechanism mounting seat I42, a detection mechanism mounting seat II43, a limiting column 44, a calibration mechanism storage seat 45, and a ground column 46; the bottom plate 41 is fixed to the ground through the ground column 46, the detection mechanism mounting seat I42, the calibration mechanism storage seat 45, and the lower mounting seat 11 are respectively fixed on the bottom plate 41, and the detection mechanism mounting seat II43 is fixed on the detection mechanism mounting seat I42. The inner holes of the detection mechanism mounting seat I42 and the detection mechanism mounting seat II43 are respectively matched with the lower end of the gauge body 21 when not tested; the calibration mechanism storage seat 45 is matched with the lower end of the calibration sleeve I; the limiting column 44 is installed on both sides of the lower mounting seat 11.

[0028] The method of using the present invention: First, place the calibration mechanism 3 into the positioning mechanism 1, then install the detection mechanism 2 into the positioning mechanism 1, calibrate the dial indicator of the detection mechanism 2 to zero, take out the calibration mechanism 2 and install the workpiece to be inspected (steering column guard tube) into the positioning mechanism 1, and rotate the gauge body 21 of the detection mechanism 2 to detect the position between the steering column guard tube bearing 51 and the inner diameter of the steering column guard tube 5.

Claims

1. A device for detecting the position of a steering column guard tube bearing, characterized in that: The invention comprises a positioning mechanism (1), a detection mechanism (2) mounted on the positioning mechanism (1), wherein the detection mechanism (2) comprises a gauge body (21), a detection block (22), an upper fixed sleeve (25), and a dial indicator (215); the dial indicator (215) is mounted on the upper end of the upper fixed sleeve (25) via a dial indicator fixing seat (27), the lower end of the upper fixed sleeve (25) is connected to the gauge body (21), a detection groove (2101) is opened in the middle of the gauge body (21), and the detection block is mounted in the detection groove (2101) (22), the detection block (22) is hinged to the gauge body (21) through the pin shaft III (23), the lower end of the detection block (22) is provided with a spherical protrusion (221), the spherical protrusion (221) contacts the inner hole wall of the bearing to be tested, the top end face of the detection block (22) contacts the measuring end of the dial indicator (215) through the transmission rod I (24) passing through the gauge body (21) and the transmission rod II (210) passing through the dial indicator fixing seat (27), and the lower end of the gauge body (21) is mounted on the positioning mechanism (1).

2. The device for detecting the position of a steering column guard tube bearing according to claim 1, characterized in that: The inner hole of the upper fixing sleeve (25) and the outer cylindrical surface of the lower end of the dial indicator fixing seat (27) are rotatably connected through a bearing; the dial indicator fixing seat (27) is also provided with guide sleeves II (28) at the upper and lower ends of the transmission rod through the hole II, and the gauge body (21) is provided with a guide sleeve I (26) at the upper end of the transmission rod through the hole I.

3. The device for detecting the position of a steering column guard tube bearing according to claim 1, characterized in that: The dial end of the dial indicator (215) is mounted on the dial indicator outer fixing seat (214), and the measuring end of the dial indicator (215) is mounted on the upper end of the dial indicator fixing seat (27) through the dial indicator fixing member (212) and locked by the dial indicator locking member (213).

4. The device for detecting the position of a steering column guard tube bearing according to claim 1, characterized in that: The positioning mechanism comprises a lower mounting seat (11), a sliding sleeve (13), a connecting rod (14), and an upper fixed seat (15). The upper fixed seat (15) and the lower mounting seat (11) are respectively provided with a pin hole in the transverse direction. The connecting rod (14) is a variable cross-section structure with a thick middle and thin ends. The upper fixed seat (15) and the lower mounting seat (11) are respectively connected to the connecting rod (14) through a pin I (16) and a pin II (17) passing through the pin hole. The sliding sleeve (13) is also respectively installed between the middle section of the upper fixed seat (15), the lower mounting seat (11) and the connecting rod (14), and a linear spring (19) is installed between the sliding sleeve (13) and the end face of the middle section of the connecting rod (14). Elastic positioning components for cooperating with the inner hole wall of the steering column guard tube are respectively installed on the outer circumferences of the sliding sleeve adjacent to the upper fixed seat (15) and the lower mounting seat (11).

5. The device for detecting the position of a steering column guard tube bearing according to claim 1, characterized in that: The elastic positioning assembly comprises a retainer (12) and a steel ball (18). The retainer (12) is respectively mounted on the outer circumference of the sliding sleeve and the upper fixed seat (15) and the outer circumference of the sliding sleeve (13) and the lower mounting seat (11). The steel ball (18) is mounted on the retainer (12).

6. The device for detecting the position of a steering column guard tube bearing according to claim 4, characterized in that: The detection device also includes a calibration mechanism (3), which includes a calibration sleeve I (31) and a calibration sleeve II (32). The calibration sleeve II (32) is fixed to the upper end of the calibration sleeve I (31). The inner hole of the calibration sleeve I (31) matches with the outer circles of the lower mounting seat (11), the sliding sleeve (13), the middle section of the connecting rod (14), and the lower end of the upper fixed seat (15) from bottom to top, and the calibration sleeve II (32) matches with the outer circle of the upper end of the upper fixed seat (15).

7. The device for detecting the position of a steering column guard tube bearing according to claim 6, characterized in that: The detection device also includes a base (4), the base (4) including a bottom plate (41), a detection mechanism mounting seat I (42), a detection mechanism mounting seat II (43), and a ground column (46); the bottom plate (41) is fixed to the ground through the ground column (46), the detection mechanism mounting seat I (42) and the lower mounting seat (11) are respectively fixed on the bottom plate (41), and the detection mechanism mounting seat II (43) is fixed on the detection mechanism mounting seat I (42), and the inner holes of the detection mechanism mounting seat I (42) and the detection mechanism mounting seat II (43) are respectively matched with the lower end of the gauge body (21) when not being detected.

8. The device for detecting the position of a steering column guard tube bearing according to claim 7, characterized in that: The base (4) further comprises a calibration mechanism storage seat (45), which is fixed on the bottom plate (41) and matches the lower end of the calibration sleeve I.

9. The device for detecting the position of a steering column guard tube bearing according to claim 7, characterized in that: The base (4) further comprises a limiting column (44), which is mounted on both sides of the lower mounting seat (11).

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