Two-wheeled vehicle frame rigidity testing tool and method

Abstract

The present application relates to a kind of two-wheeled vehicle frame rigidity test tool and method tool, including head tube limiting module, front limiting module, rear limiting module, head tube limiting module, front limiting module, rear limiting module will be tested frame three points collinear positioning, head tube limiting module is for load position.Testing rigidity method, including frame torsion test method, frame longitudinal tensile test method, frame longitudinal thrust test method, all by the load to be tested frame, obtain several groups of frame deformation value, take the mean of several groups of deformation value, calculate frame torsional stiffness=torque / deformation value, frame torsional stiffness is compared with standard value, frame torsional stiffness greater than or equal to standard value 10% for qualified frame;The present application solves the constraint mode and fixed mode of frame rigidity test working condition, so that the standard of frame rigidity test is unified;Frame rigidity test value has unified working condition, and parameter value has comparability.

Description

Technical Field

[0001] This invention relates to the field of two-wheeled vehicle stiffness testing technology, and in particular to a two-wheeled vehicle frame stiffness testing fixture and method. Background Technology

[0002] Currently, the safety and handling of electric two-wheeled vehicles are receiving increasing attention, and the requirements for the rigidity of the vehicle's core component, the frame, are becoming more and more apparent.

[0003] Currently, commonly used frame stiffness testing methods in the industry include static stiffness testing and dynamic stiffness testing. Static testing includes vertical stiffness testing and torsional stiffness testing, while dynamic stiffness testing includes free modal testing and operational modal testing. Different countries and manufacturers have different standards for these tests. Companies usually combine standard tests with custom operating condition simulations, resulting in a lack of unified standards and reasonable testing methods for frame stiffness testing in the electric two-wheeler industry. This leads to a lack of unified evaluation of frame stiffness quality and low standards. Summary of the Invention

[0004] In response to the shortcomings of the existing production technology, the applicant provides a two-wheeled vehicle frame stiffness testing fixture and method that meets the requirement of unified frame stiffness testing method rules and provides the general fixture required for the method.

[0005] The technical solution adopted in this invention is as follows:

[0006] A two-wheeled vehicle frame stiffness testing fixture includes a head tube limiting module, a front limiting module, and a rear limiting module. The head tube limiting module, the front limiting module, and the rear limiting module position the frame to be tested at three collinear points. The head tube limiting module is the load application position.

[0007] As a further improvement to the above technical solution:

[0008] The head tube limiting module includes a longitudinal tie rod that passes through the head tube of the vehicle frame to be tested, is coaxial with the head tube, and is fastened to the vehicle frame to be tested.

[0009] The front limiting module includes a front base as a reference and a clamping plate for holding the vehicle frame to be tested, with the clamping plate being securely connected to the front base.

[0010] The rear limiting module includes a rear base as a reference, a rear clamp for holding the test frame, and a rear flat fork shaft that passes through the test frame, the rear clamp, and the rear base.

[0011] The longitudinal tie rod is provided with at least two load application points, denoted as force point A and force point B, and a deformation distance is reserved between force point A and force point B.

[0012] Of the two load application points, the one with the higher longitudinal height has a pre-reserved deformation distance between it and the top of the longitudinal tie rod.

[0013] A method for testing the stiffness of a two-wheeled vehicle frame using a frame stiffness testing fixture includes a frame torsion test method, a frame longitudinal tension test method, and a frame longitudinal thrust test method.

[0014] The above methods all involve applying a load to the test frame, obtaining several sets of frame deformation values, and then taking the average of these deformation values ​​to calculate the frame torsional stiffness: torque / deformation value.

[0015] The frame torsional stiffness is compared with the standard value. A frame with a torsional stiffness greater than or equal to 10% of the standard value is considered a qualified frame.

[0016] As a further improvement to the above technical solution:

[0017] The steps for the frame torsion test are as follows: apply a load perpendicular to the frame at point A on one side of the frame, obtain the frame deformation value, and after obtaining the average value of multiple sets of tests, calculate the frame torsional stiffness = torque / deformation value.

[0018] The steps for longitudinal tensile testing of the frame are as follows: apply a load to the front of the frame at the stress point B, obtain the frame deformation value, and after obtaining the average value of multiple sets of tests, calculate the frame torsional stiffness = torque / deformation value.

[0019] The steps for the longitudinal thrust test of the frame are as follows: apply a load to the rear of the frame at the force point B, obtain the frame deformation value, and after obtaining the average value of multiple sets of tests, calculate the frame torsional stiffness = torque / deformation value.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention addresses the constraints and fixing methods in vehicle frame stiffness testing, thereby standardizing the testing process. Vehicle frame stiffness test values ​​are derived under uniform conditions, ensuring comparability of parameter values.

[0022] The stiffness testing bench structure proposed in this invention is simple in structure and low in manufacturing cost; moreover, it is easy to operate and saves testing personnel's operating time.

[0023] The frame stiffness test value is fed back to the overall riding and handling of the bicycle, increasing the bicycle's selling points and added value. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structural tooling of this application.

[0025] Figure 2 This is a rear view of the tooling used in this application.

[0026] Figure 3This is a schematic diagram of the rear clamp in this application.

[0027] The components include: 1. Frame; 2. Longitudinal tie rod; 3. Front base; 4. Clamping plate; 5. Rear base; 6. Rear clamp; 7. Rear swingarm axle. Detailed Implementation

[0028] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0029] like Figures 1-3 As shown, the two-wheeled vehicle frame 1 stiffness testing fixture of this embodiment includes a head tube limiting module, a front limiting module, and a rear limiting module. The head tube limiting module, the front limiting module, and the rear limiting module position the three points of the frame 1 to be tested collinearly, and the head tube limiting module is the load application position.

[0030] The head tube limiting module includes a longitudinal tie rod 2, which passes through the head tube of the test frame 1, is coaxial with the head tube, and is fastened to the test frame 1.

[0031] The front limiting module includes a front base 3 as a reference and a clamping plate 4 for holding the test frame 1. The clamping plate 4 is fastened to the front base 3.

[0032] The rear limiting module includes a rear base 5 as a reference, a rear clamp 6 for holding the test frame 1, and a rear flat fork shaft 7 that passes through the test frame 1, the rear clamp 6, and the rear base 5.

[0033] The longitudinal tie rod 2 has at least two load application points, denoted as force point A and force point B, with a pre-reserved deformation distance between force point A and force point B.

[0034] Of the two load application points, the one with the higher longitudinal height has a pre-reserved deformation distance between it and the top of the longitudinal tie rod 2.

[0035] The method for testing the stiffness of a two-wheeled vehicle frame 1 using a stiffness testing fixture in this embodiment includes a frame 1 torsion test method, a frame 1 longitudinal tensile test method, and a frame 1 longitudinal thrust test method.

[0036] The above methods all involve applying a load to the test frame 1, obtaining several sets of deformation values ​​for the frame 1, and then taking the average of these deformation values ​​to calculate the torsional stiffness of the frame 1 as: torque / deformation value.

[0037] Comparing the torsional stiffness of frame 1 with the standard value, a frame 1 with a torsional stiffness greater than or equal to 10% of the standard value is considered a qualified frame 1.

[0038] The steps for the torsion test of frame 1 are as follows: apply a load perpendicular to frame 1 at point A on one side of frame 1, obtain the deformation value of frame 1, and after obtaining the average value of multiple sets of tests, calculate the torsional stiffness of frame 1 = torque / deformation value.

[0039] The steps for longitudinal tensile testing of frame 1 are as follows: apply a load to the front of frame 1 at the stress point B, obtain the deformation value of frame 1, and after obtaining the average value of multiple sets of tests, calculate the torsional stiffness of frame 1 = torque / deformation value.

[0040] The steps for the longitudinal thrust test of frame 1 are as follows: apply a load to the rear of frame 1 at the force point B, obtain the deformation value of frame 1, and after obtaining the average value of multiple test sets, calculate the torsional stiffness of frame 1 = torque / deformation value.

[0041] The specific structure and testing process of this application are as follows:

[0042] The purpose of this application is to provide a test method and tooling for obtaining the stiffness test value of the frame 1 from a uniform working condition, with comparable parameter values. The frame 1 to be tested is positioned at three points, and the whole vehicle is in an upright state when it is in the test state.

[0043] like Figure 1 As shown, the tooling includes a head tube limiting module, a front limiting module, and a rear limiting module.

[0044] The head tube limiting module uses a longitudinal tie rod 2, which is coaxially set with the head tube. The longitudinal tie rod 2 passes through the head tube, and subsequent force points are set on the longitudinal tie rod 2, which are respectively denoted as force point A and force point B.

[0045] The front limiting module has a front base 3 and a clamping plate 4 that is fastened to the front base 3. The clamping plate 4 is used to clamp the front of the frame 1 corresponding to the position of the frame 1 to be tested.

[0046] The rear limiting module has a rear base 5 and a rear clamp 6 that is fastened to the rear base 5. The rear swingarm shaft 7 passes through the rear clamp 6, the frame to be tested 1, and the rear base 5 to fix the three together.

[0047] When clamping the frame 1 to be tested, place the frame 1 horizontally on the front base 3 and the rear base 5, use the rear flat fork shaft 7 to fix the frame 1 to the rear clamp 6, and then install it on the rear base 5; use fixing bolts to fix the frame 1 and the clamp 4 to the front base 3; the longitudinal tie rod 2 passes through the head tube of the frame 1 and is fixed with bolts.

[0048] This application proposes three test methods for frame stiffness testing, namely:

[0049] 1. Frame torsion test method

[0050] 2. Longitudinal tensile test method for frame 1

[0051] 3. Test method for longitudinal thrust of frame 1;

[0052] By comparing the stiffness values ​​of frame 1 with the standard values ​​obtained through these three testing methods, the rationality of the stiffness of frame 1 can be judged. The following description uses a frame 1 as an example to illustrate the stiffness test.

[0053] In the three testing methods of this application, the frame 1 is fixed in the same way. The frame 1 is arranged on the front base 3 and the rear base 5. The front part is fixed with bolts to fasten the clamp 4 to the base 3. The rear part is fixed with the rear flat fork axle 7 to fix the frame 1 and the rear clamp 6 to the rear base 54.

[0054] The initial width of the rear clamp 65 can be expanded to a larger size by adjusting the bushing, making it suitable for rear clamps 6 of different frames 1. The function of adjusting the bushing to adjust the width is a function of existing components and will not be described in detail in this application.

[0055] like Figure 3 As shown, the horizontal distance from the front fixing plate 4 to the center point C of the hole below the head tube of the frame 1 is 220mm-240mm; the endpoint value of 220mm and 240mm can be selected, or the middle value of 230mm, 225mm and 235mm can be selected; to meet the positioning of the rear clamp 6 and the front fixing plate 4 of the frame 1 during the test, and to meet the testing between different frames 1.

[0056] The two load application points on the longitudinal tie rod 2 are force application points A and B. The distance between the two points is 380mm-420mm. The endpoint values ​​can be 380mm and 420mm, or the intermediate values ​​can be 390mm, 400mm and 410mm. The distance from the upper point, i.e., point A, to the top of the longitudinal tie rod 2 is 430mm-470mm. The endpoint values ​​can be 430mm and 470mm, or the intermediate values ​​can be 440mm, 450mm and 460mm.

[0057] Three testing methods for determining load points through stiffness testing are as follows:

[0058] Test Method 1: Frame 1 Torsional Test. Apply a load F1 (200N~500N) to the left at the force point A on the right side of the frame 1 and obtain the deformation value (a, mm) of the frame 1.

[0059] Test Method 2: Longitudinal Tensile Test of Frame 1. Apply a load F2 (200N~500N) to the front of the frame 1 at the stress point B of the frame 1 and obtain the deformation value (b, mm) of the frame 1.

[0060] Test method 3: Longitudinal thrust test of frame 1. Apply a load F3 (200N~500N) to the rear of frame 1 at the stress point B of frame 1 and obtain the deformation value (c, mm) of frame 1.

[0061] Test method 1: Test 3 sets of frame 1 deformation values ​​under the same F1, and record them as a value. Take the average of the 3 sets of a values ​​as a1 (average value of frame 1 deformation), that is, frame 1 torsion P1 = F1 / a1. Compare P1 with the standard value of frame 1 torsional stiffness P0. If it is not lower than 10%, it is considered qualified. Otherwise, the stiffness of frame 1 needs to be improved.

[0062] Test method 2 tests the longitudinal stiffness P2 of frame 1, and test method 3 tests the longitudinal stiffness P3 of frame 1 in the same way as test method 1.

[0063] The results of the three test methods showed that P1, P2, and P3 were all qualified, indicating that the stiffness of frame 1 is qualified.

[0064] The conventional approach is to apply torque to the frame 1, and the torsional stiffness is calculated as torque / torsional angle. This application replaces the torsional angle factor with the deformation value to obtain the torsional stiffness, and the calculation formula is changed to torsional stiffness = torque / deformation value. Since measuring the torsional angle is difficult and prone to deviation, measuring the deformation value is more intuitive and convenient, and the tooling required for deformation value measurement is also simpler, as described above. Therefore, the advantages of this application are: more accurate measurement, simpler structure, and significantly reduced difficulty in multi-point measurement.

[0065] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A fixture for testing the stiffness of a two-wheeled vehicle frame, characterized in that: The system includes a head tube limiting module, a front limiting module, and a rear limiting module. These three modules position the test frame (1) collinearly. The head tube limiting module is the load application position. The head tube limiting module includes a longitudinal tie rod (2), which passes through the head tube of the test frame (1), is coaxial with the head tube, and is fastened to the test frame (1). The front limiting module includes a front base (3) as a reference and a clamping plate (4) for clamping the test frame (1), with the clamping plate (4) being fastened to the front base (3). The rear limiting module includes a rear base (5) as a reference, a rear clamp (6) for clamping the test frame (1), and a rear flat fork shaft (7) that passes through the test frame (1), the rear clamp (6), and the rear base (5). The longitudinal tie rod (2) is provided with at least two load application points, denoted as force point A and force point B, and a deformation distance is reserved between force point A and force point B; The tooling is used to test the stiffness, including frame (1) torsion test, frame (1) longitudinal tension test and frame (1) longitudinal thrust test: the frame (1) torsion test applies a load perpendicular to the frame (1) at the force point A on one side of the frame (1), the frame (1) longitudinal tension test applies a load to the front of the frame (1) at the force point B, and the frame (1) longitudinal thrust test applies a load to the rear of the frame (1) at the force point B; the above tests are all conducted by applying a load to the frame (1) to be tested, obtaining several sets of frame (1) deformation values, taking the average of several sets of deformation values, and calculating the frame (1) torsional stiffness = torque / deformation value. The frame (1) torsional stiffness is compared with the standard value. The frame (1) torsional stiffness is considered qualified if it is greater than or equal to 10% of the standard value.

2. The two-wheeled vehicle frame stiffness testing fixture as described in claim 1, characterized in that: Of the two load application points, the one with the higher longitudinal height has a pre-reserved deformation distance between it and the top of the longitudinal tie rod (2).

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