Positioning tool for steering wheel HOD detection

Abstract

The utility model belongs to steering wheel HOD detection technical field especially relates to a kind of positioning tool for steering wheel HOD detection, solve the technical problem of lack of special positioning contact tool in the steering wheel HOD detection process in prior art, specifically by multiple lower profiling clamps Forming support position in virtual annular, support position is used to support the lower radial end of steering wheel grip ring, so that steering wheel grip ring keeps horizontal posture;Lower pressing device is arranged in upper layer arrangement area, and lower pressing device is connected with lower pressing profiling contact clamp;Lower pressing device makes lower pressing profiling contact clamp move to lower layer clamp direction by driving cylinder, and makes lower pressing profiling contact clamp elastically contact the upper radial end of steering wheel grip ring;This tool can stably support steering wheel grip ring and realize elastic profiling contact, guarantee the accuracy and consistency of HOD detection signal acquisition, while improve the standardization and reliability of HOD detection.

Description

Technical Field

[0001] This utility model belongs to the field of steering wheel HOD detection technology, and in particular relates to a positioning fixture for steering wheel HOD detection. Background Technology

[0002] In the mechanical manufacturing field of HOD testing for automotive steering wheels, existing testing methods lack dedicated contour-following contact testing fixtures, making it impossible to accurately simulate the real tactile sensation, contact posture, and force distribution of a human hand holding the steering wheel rim. Relying solely on a single resistance testing method, the steering wheel is prone to positioning deviation and uneven force during the testing process, resulting in a significant deviation between the test data and the feedback information from actual use by customers. This makes it difficult to meet the high precision requirements of HOD testing for contact simulation, becoming a technical pain point in the industry's standardized HOD testing of steering wheels. Utility Model Content

[0003] In view of this, the present invention aims to provide a positioning fixture for steering wheel HOD detection, which solves the technical problems in the prior art where there is a lack of dedicated positioning contact fixtures in the steering wheel HOD detection process, which makes it impossible to achieve horizontal and stable positioning support for the steering wheel grip ring, and there is no suitable elastic contact structure to simulate the real contact state of a human hand holding the steering wheel grip ring, thus causing distortion of HOD detection results.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A positioning fixture for steering wheel HOD detection, comprising:

[0006] Tooling frame, lower fixture, pressing device, and pressing contour contact fixture;

[0007] The tooling frame has a lower arrangement area and an upper arrangement area;

[0008] The lower clamp is arranged in the lower arrangement area. The lower clamp includes multiple lower contour clamps, which form an annular support position. The support position is used to support the lower radial end of the steering wheel grip, so that the steering wheel grip remains in a horizontal position.

[0009] The pressing device is arranged in the upper arrangement area, and the pressing device is connected to the pressing contour contact fixture;

[0010] The pressing device includes a drive cylinder, which drives the pressing contour contact fixture to move toward the lower fixture and makes the pressing contour contact fixture elastically contact the upper radial end of the steering wheel grip ring.

[0011] Furthermore, the lower contouring fixture is provided in four sets, and the four sets of lower contouring fixtures are connected to the lower contouring fixture base plate and are arranged in a rotationally symmetrical manner with respect to the center of the lower contouring fixture base plate;

[0012] The lower contouring fixture base plate is fixedly connected to the machine frame work plate;

[0013] The frame work plate is arranged horizontally in the lower arrangement area.

[0014] Furthermore, each set of the lower contouring fixtures includes a support block seat and a support block;

[0015] The support block is connected above the support block base, and a support surface with a semi-circular cross-section is formed above the support block.

[0016] Furthermore, the pressing contour contact fixture includes a connecting plate and four sets of pressing contour contact portions;

[0017] The four sets of downward pressing contouring contact parts are located below the connecting plate and are arranged in a rotationally symmetrical manner with respect to the central hole of the connecting plate; the four sets of downward pressing contouring contact parts and the four sets of downward contouring clamps are arranged in a one-to-one correspondence in contact position.

[0018] Furthermore, each set of the downward contouring contact portion includes a contact seat, a contact block, a compression spring, and a guide shaft;

[0019] The contact seat is fixedly connected to the connecting plate, and the contact block is connected to the contact seat through two sets of parallel compression springs; the contact block forms an arc-shaped contact surface that matches the upper radial end of the steering wheel grip ring;

[0020] The guide shaft is located on the inner ring of the compression spring. One end of the guide shaft is connected to the contact block, and the other end passes through the guide hole of the contact seat.

[0021] Furthermore, the pressing device includes a lower moving plate, a fixed plate, and four sets of elastic guiding devices;

[0022] The lower movable plate is fixedly connected to the connecting plate, and the lower movable plate is connected to the fixed plate through four sets of elastic guiding devices.

[0023] Furthermore, it also includes an upper fixing plate and multiple fixed connecting columns;

[0024] The upper fixed plate is arranged above the lower movable plate and is parallel to the lower movable plate;

[0025] The multiple fixed connecting columns fix the frame working plate, the upper fixed plate and the fixed plate.

[0026] Furthermore, a cylinder connection end is fixedly connected to the center of the fixing plate;

[0027] The drive cylinder is mounted on the upper fixed plate, and the output end of the drive cylinder passes through the upper fixed plate and is connected to the cylinder connection end.

[0028] Furthermore, the elastic guiding device includes a guide sleeve, a guide shaft, and an elastic compression spring;

[0029] A set of guide sleeves is provided around the lower movable plate, and the guide shaft is movably disposed within the guide sleeves;

[0030] The lower end of the guide shaft is connected to the fixed plate, and the upper end is provided with a limiting end face;

[0031] The limiting end face and the end of the guide sleeve that protrudes from the lower moving plate are connected by the elastic compression spring.

[0032] Furthermore, the lower movable plate has an insertion space along its side and towards its bottom plane, and the connecting plate is snapped into the insertion space and fixedly connected by fasteners.

[0033] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0034] This fixture provides dedicated positioning and contact contouring for steering wheel HOD testing. It can stably support the steering wheel grip and achieve elastic contouring contact, simulating the real touch and force state of a human hand holding the steering wheel. This ensures the accuracy and consistency of HOD test signal acquisition, while also improving the standardization and reliability of HOD testing. Attached Figure Description

[0035] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0036] In the attached diagram:

[0037] Figure 1 This is a schematic diagram of the overall structure of the positioning fixture for steering wheel HOD detection as described in an embodiment of the present invention;

[0038] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0039] Figure 3 for Figure 2 A partially enlarged schematic diagram of the middle and lower layer fixtures;

[0040] Figure 4 This is a schematic diagram showing the arrangement of the support block seat according to an embodiment of the present utility model;

[0041] Figure 5 This is a schematic diagram of the lower contouring fixture described in an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of the fit between the guide shaft and the guide hole according to an embodiment of the present utility model.

[0043] Explanation of reference numerals in the attached figures:

[0044] 10. Tooling frame; 11. Lower arrangement area; 12. Upper arrangement area; 13. Frame working plate; 14. Fixed connecting column; 20. Lower clamp; 21. Lower contour clamp; 22. Lower contour clamp base plate; 210. Support block seat; 211. Support block; 212. Support surface; 30. Pressing device; 301. Insertion space; 302. Fastener; 31. Lower moving plate; 32. Fixed plate; 320. 33. Cylinder connecting end; 310. Upper fixing plate; 40. Drive cylinder; 41. Pressing contour contact fixture; 42. Connecting plate; 43. Pressing contour contact part; 44. Contact seat; 45. Contact block; 46. Compression spring; 47. Arc-shaped contact surface; 48. Guide shaft; 49. Guide hole; 50. Elastic guide device; 51. Guide sleeve; 52. Guide shaft; 53. Restricting end face; 54. Elastic compression spring. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and do not constitute a limitation thereof.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0047] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0048] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] The present invention aims to provide a positioning fixture for HOD testing of steering wheels, which solves the technical problems in the prior art where there is a lack of dedicated positioning contact fixtures in the HOD testing process of steering wheels, which makes it impossible to achieve horizontal and stable positioning support for the steering wheel grip ring, and there is no suitable elastic contact structure to simulate the real contact state of a human hand holding the steering wheel grip ring, thus causing the HOD testing results to be distorted.

[0051] like Figures 1 to 5 As shown, the positioning fixture for steering wheel HOD detection includes: a fixture frame 10 having a lower arrangement area 11 and an upper arrangement area 12; a lower fixture 20 arranged in the lower arrangement area 11, and the lower fixture 20 including a plurality of lower contouring fixtures 21; the plurality of lower contouring fixtures 21 forming an annular support position, which can be understood as a virtual annulus, the support position being used to support the lower radial end of the steering wheel grip, so that the steering wheel grip maintains a horizontal posture;

[0052] The pressing device 30 is arranged in the upper arrangement area 12. The pressing device 30 is connected to the pressing contour contact jig 40. The pressing device 30 causes the pressing contour contact jig 40 to move towards the lower jig 20 through the driving cylinder 310, and causes the pressing contour contact jig 40 to elastically contact the upper radial end of the steering wheel grip ring.

[0053] In this embodiment, there are four sets of lower contouring clamps 21. The drive cylinder 310 drives the lower contouring contact clamp 40 to move downward at a set speed until it elastically contacts the radial end of the steering wheel grip ring. This simulates the initial contact state when a human hand holds the steering wheel and can correspond to multiple contact points. This provides a horizontal and stable steering wheel positioning basis for HOD detection and ensures that the steering wheel grip ring does not shift or tilt during the detection process.

[0054] In one specific embodiment, such as Figure 2 , Figure 4 As shown, the lower contouring fixture 21 is provided in four sets, and the four sets of lower contouring fixtures 21 are connected to the lower contouring fixture base plate 22. The lower contouring fixture base plate 22 is arranged in a rotationally symmetrical manner at the center.

[0055] The lower contouring fixture base plate 22 is fixedly connected to the machine frame work plate 13;

[0056] The frame work plate 13 is horizontally arranged in the lower arrangement area 11.

[0057] In this embodiment, the center of the frame working plate 13 is the positioning center of the steering wheel grip. Four sets of lower contouring fixtures 21 are respectively arranged in the four quadrants of the frame working plate 13. The included angle between two adjacent sets of lower contouring fixtures 21 is 90°. They are adapted to a conventional car steering wheel grip with a diameter of 380mm and provide four-point support for the lower radial end of the grip, keeping the grip horizontal and avoiding deformation of the grip due to uneven support points. This ensures that the contact signal collected by the sensor during HOD detection is without deviation.

[0058] In one specific embodiment, such as Figure 2 , Figure 4 As shown, each set of lower contour jigs 21 includes: a support block seat 210, on which a support block 211 is connected; a support surface 212 with a semi-circular arc cross-section is constructed above the support block 211.

[0059] The support block seat 210 is fixed to the frame working plate 13 by bolts. The support block 211 is made of a material that matches the feel of the rubber material of the steering wheel grip. The arc of the semi-circular support surface 212 is consistent with the outer arc of the lower radial end of the steering wheel grip, providing a real contact support base for the HOD detection outer area capacitance sensor.

[0060] In one specific embodiment, such as Figure 3 , Figure 5As shown, the pressing contour contact fixture 40 includes: a connecting plate 41 and four sets of pressing contour contact parts 42; the four sets of pressing contour contact parts 42 are disposed below the connecting plate 41 and are arranged in a rotationally symmetrical manner with respect to the central hole of the connecting plate 41; the four sets of pressing contour contact parts 42 are arranged in a one-to-one correspondence with the four sets of pressing contour fixtures 21 in terms of contact orientation.

[0061] The center hole of the connecting plate 41 is coaxial with the center of the steering wheel grip. The four sets of downward contouring contact parts 42 and the four sets of downward contouring clamps 21 are aligned vertically, corresponding to the upper left, upper right, lower left and lower right radial ends of the steering wheel grip respectively. When pressed down, symmetrical contact is achieved between the upper and lower ends of the grip, avoiding deformation of the grip caused by force on one side. This ensures that the sensors at each position of the grip are in a natural state during HOD testing, and that the collected resistance and capacitance signals are true and effective.

[0062] In one specific embodiment, such as Figure 3 , Figure 5 As shown, each set of downward contouring contact parts 42 includes: a contact seat 421, which is fixedly connected to the connecting plate 41; a contact block 422, which is connected to the contact seat 421 by two sets of parallel compression springs 423; and an arc-shaped contact surface 424 that matches the upper radial end of the steering wheel grip is constructed on the contact block 422.

[0063] Each compression spring 423 has a guide shaft 425 on its inner ring; one end of the guide shaft 425 is connected to the contact block 422, and the other end passes through the guide hole 426 of the contact seat 421.

[0064] When the compression spring 42 contacts the grip ring, the compression spring 423 is compressed and generates elastic rebound force, so that the arc-shaped contact surface 424 makes flexible contact with the grip ring, which is equivalent to simulating the elastic touch when a human hand holds a steering wheel. The elastic force of the compression spring is transmitted through the guide shaft 425 to prevent the contact block 422 from shifting, and to ensure that the grip force signal collected by the inner resistance / pressure sensor during HOD detection is consistent with the signal when a real person holds the wheel.

[0065] In one specific embodiment, such as Figure 3 , Figure 5 As shown, the pressing device 30 includes: a lower moving plate 31, which is fixedly connected to the connecting plate 41; the lower moving plate 31 is fixedly connected to the fixed plate 32 through four sets of elastic guide devices 50.

[0066] The lower moving plate 31 is fixed to the connecting plate 41 by bolts. Four sets of elastic guide devices 50 are respectively arranged at the four corners of the lower moving plate 31 and connected to the fixed plate 32. When the pressing device 30 drives the pressing contour contact jig 40 to move, the elastic guide device 50 restricts the movement direction of the lower moving plate 31 to the vertical direction to avoid horizontal deviation and ensure the precise alignment of the pressing contour contact part 42 with the grip ring. At the same time, the elastic buffering effect of the elastic guide device 50 avoids hard contact of the grip ring caused by excessive pressing speed, protects the HOD sensor on the steering wheel grip ring, and ensures that the sensor is not damaged and the signal acquisition is not interfered with during the detection process.

[0067] In one specific embodiment, such as Figure 3 , Figure 5 As shown, it also includes an upper fixed plate 33, which is arranged above the lower movable plate 31 and parallel to the lower movable plate 31; multiple fixed connecting columns 14 fix the frame working plate 13, the upper fixed plate 33 and the fixed plate 32.

[0068] The fixed connecting columns 14 pass through the four ends of the frame working plate 13, the lower moving plate 31 and the upper fixed plate 33 respectively, forming a stable tooling frame to ensure that the relative positions of each component remain unchanged.

[0069] In one specific embodiment, such as Figure 3 , Figure 5 As shown, the center of the fixed plate 32 is fixedly connected to the cylinder connection end 320; the drive cylinder 310 is set on the upper fixed plate 33, and the output end of the drive cylinder 310 passes through the upper fixed plate 33 and is connected to the cylinder connection end 320.

[0070] The cylinder connection end 320 can adjust the output stroke according to the height of the steering wheel grip, so as to achieve elastic contact of grips at different heights. The drive cylinder 310 is linked with the computer program of the HOD detection system. After the grip is positioned, the program controls the cylinder to automatically output the set force value, realize the automation of detection, ensure that the contact force is consistent in each detection, and make the acquisition of capacitance and resistance signals of HOD detection repeatable.

[0071] In one specific embodiment, such as Figure 3 , Figure 5 As shown, the elastic guide device 50 includes: a guide sleeve 51, with a set of guide sleeves 51 respectively arranged around the lower moving plate 31; a guide shaft 52, with a set of movable guide shafts 52 arranged inside each set of guide sleeves 51; the lower end of the guide shaft 52 is connected to the fixing plate 32; a limiting end face 53 is provided at the upper end of the guide shaft 52; the limiting end face 53 and the edge of the guide sleeve 51 extending out of the lower moving plate 31 are connected by an elastic compression spring 54.

[0072] The limiting end face 53 prevents the guide shaft 52 from disengaging from the guide sleeve 51, ensuring the stability of the tooling operation. At the same time, the elastic force of the elastic guide device 50 can offset part of the driving force of the cylinder, keeping the contact force of the grip ring constant and ensuring that the signal collected by the sensor during HOD detection is stable and without fluctuations.

[0073] In one specific embodiment, such as Figure 2 As shown, the lower movable plate 31 has an insertion space 301 along its side and towards its bottom plane. The connecting plate 41 can be inserted into the insertion space 301 and formed a fixed connection by fasteners 302.

[0074] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A positioning fixture for steering wheel HOD detection, characterized in that, include: Tooling frame (10), lower fixture (20), pressing device (30) and pressing contour contact fixture (40); The tooling frame (10) has a lower arrangement area (11) and an upper arrangement area (12). The lower clamp (20) is arranged in the lower arrangement area (11). The lower clamp (20) includes a plurality of lower contour clamps (21). The plurality of lower contour clamps (21) form an annular support position. The support position is used to support the lower radial end of the steering wheel grip, so that the steering wheel grip maintains a horizontal posture. The pressing device (30) is arranged in the upper arrangement area (12), and the pressing device (30) is connected to the pressing contour contact fixture (40); The pressing device (30) includes a drive cylinder (310) for driving the pressing contour contact jig (40) toward the lower jig (20) and causing the pressing contour contact jig (40) to elastically contact the upper radial end of the steering wheel grip.

2. The positioning fixture for steering wheel HOD detection according to claim 1, characterized in that, The lower contouring fixture (21) is provided in four sets, and the four sets of lower contouring fixtures (21) are connected to the lower contouring fixture base plate (22) and are arranged in a rotationally symmetrical manner with respect to the center of the lower contouring fixture base plate (22). The lower contour jig base plate (22) is fixedly connected to the machine frame work plate (13); The frame work plate (13) is horizontally arranged in the lower arrangement area (11).

3. The positioning fixture for steering wheel HOD detection according to claim 2, characterized in that, Each set of lower contour jigs (21) includes a support block seat (210) and a support block (211); The support block (211) is connected above the support block seat (210), and a support surface (212) with a semi-circular arc cross-section is formed above the support block (211).

4. The positioning fixture for steering wheel HOD detection according to claim 3, characterized in that, The pressing contour contact fixture (40) includes a connecting plate (41) and four sets of pressing contour contact parts (42). The four sets of downward pressing contoured contact parts (42) are disposed below the connecting plate (41) and are arranged in a rotationally symmetrical manner with respect to the central hole of the connecting plate (41); The four sets of downward contouring contact parts (42) and the four sets of downward contouring clamps (21) are arranged in a one-to-one correspondence in contact position.

5. The positioning fixture for steering wheel HOD detection according to claim 4, characterized in that, Each set of the downward contouring contact portion (42) includes a contact seat (421), a contact block (422), a compression spring (423), and a guide shaft (425); The contact seat (421) is fixedly connected to the connecting plate (41), and the contact block (422) is connected to the contact seat (421) through two sets of parallel compression springs (423); the contact block (422) forms an arc-shaped contact surface (424) that matches the upper radial end of the steering wheel grip. The guide shaft (425) is located in the inner ring of the compression spring (423). One end of the guide shaft (425) is connected to the contact block (422), and the other end passes through the guide hole (426) of the contact seat (421).

6. The positioning fixture for steering wheel HOD detection according to claim 4, characterized in that, The pressing device (30) includes a lower moving plate (31), a fixed plate (32), and four sets of elastic guiding devices (50); The lower moving plate (31) is fixedly connected to the connecting plate (41), and the lower moving plate (31) is connected to the fixed plate (32) through four sets of elastic guiding devices (50).

7. The positioning fixture for steering wheel HOD detection according to claim 6, characterized in that, It also includes an upper fixing plate (33) and multiple fixing connecting columns (14); The upper fixed plate (33) is arranged above the lower movable plate (31) and parallel to the lower movable plate (31); Multiple fixed connecting columns (14) fix the frame working plate (13), the upper fixed plate (33) and the fixed plate (32) in a fixed connection.

8. The positioning fixture for steering wheel HOD detection according to claim 7, characterized in that, A cylinder connection end (320) is fixedly connected to the center of the fixed plate (32); The drive cylinder (310) is located on the upper fixed plate (33), and the output end of the drive cylinder (310) passes through the upper fixed plate (33) and is connected to the cylinder connection end (320).

9. The positioning fixture for steering wheel HOD detection according to claim 6, characterized in that, The elastic guiding device (50) includes a guide sleeve (51), a guide shaft (52), and an elastic compression spring (54). A set of guide sleeves (51) are provided around the lower moving plate (31), and the guide shaft (52) is movably disposed in the guide sleeves (51); The lower end of the guide shaft (52) is connected to the fixed plate (32), and the upper end is provided with a limiting end face (53). The limiting end face (53) and the end of the guide sleeve (51) that protrudes from the lower moving plate (31) are connected by the elastic compression spring (54).

10. The positioning fixture for steering wheel HOD detection according to claim 6, characterized in that, The lower movable plate (31) has an insertion space (301) along its side and towards its bottom plane. The connecting plate (41) is snapped into the insertion space (301) and fixedly connected by fasteners (302).

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