Static tire wrapping force nonlinear partition fitting method

Abstract

The application discloses a static tire covering force nonlinear partition fitting method, which comprises the following steps: step one, selecting a tire with good appearance quality as a test tire; step two, after the tire is assembled on a rim, the tire is inflated to a test required air pressure, and the tire parking time needs to meet the test requirements; step three, fixing the test tire and the rim combination to a connecting column of a stiffness testing machine; step four, applying a vertical force to the tire at a test required speed, loading the tire to a test required load Fz1, applying a test required load Fz2 of an upward protrusion to the contact part of the tire and the testing machine, and lifting the protrusion device by a distance S; and step five, taking the lifting distance of the protrusion as the horizontal coordinate, taking the load of the protrusion as the vertical coordinate, and drawing a test data scatter plot of the load of the protrusion and the displacement of the protrusion. The application relates to a static tire covering force nonlinear partition fitting method, and has the characteristics of high accuracy, good repeatability and high efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tire mechanical property data processing, and particularly relates to a static tire covering force nonlinear partition fitting method. BACKGROUND

[0002] The automobile tire is one of important components of the automobile, which directly contacts with the road surface and, together with the automobile suspension, mitigates the impact received by the automobile during driving, guarantees good adhesion of the automobile wheel and the road surface, improves the traction, braking and passing of the automobile, and bears the weight of the automobile. The important role of the tire on the automobile is increasingly valued by people. The covering stiffness characteristic of the tire refers to the relationship between the raised load at the tire grounding and the raised displacement under the condition of the specified tire pressure and vertical load. The covering stiffness characteristic reflects the ability of the tire to cover the road surface (i.e., the covering characteristic) and is closely related to the comfort of the tire. However, the current testing method has some problems: 1. low accuracy, poor repeatability and low efficiency. Therefore, it is necessary to design a static tire covering force nonlinear partition fitting method. SUMMARY

[0003] The application aims to provide a static tire covering force nonlinear partition fitting method to solve the above problems and solve the problems mentioned in the background.

[0004] To solve the above problems, the application provides a static tire covering force nonlinear partition fitting method technical scheme:

[0005] A static tire covering force nonlinear partition fitting method comprises the following steps:

[0006] Step one, selecting a tire with good appearance quality as a test tire;

[0007] Step two, after the tire is assembled on the rim, the tire is inflated to the required test air pressure, and the tire parking time meets the test requirements;

[0008] Step three, fixing the test tire and the rim combination to the connecting column of the stiffness testing machine;

[0009] Step four, applying a vertical force to the tire at a test required speed, loading the tire to a test required load Fz1, applying a test required load Fz2 of the upward protrusion to the contact part of the tire and the test table, and lifting the distance S of the protrusion device;

[0010] Step five, taking the lifted distance of the protrusion as the horizontal coordinate and the load of the protrusion as the vertical coordinate to draw a test data scatter plot of the load of the protrusion and the displacement of the protrusion;

[0011] Step 6: Divide the test data scatter plot into zones according to the test load, which are 0%-30%, 30%-60%, 60%-90% of the test load in the loading section and 0%-30%, 30%-60%, 60%-90% of the test load in the unloading section;

[0012] Step 7: Fit the test data of each area with a cubic polynomial. Set the fitting formula as y = ax 3 +bx 2 +cx+d, find the values ​​of constants a, b, and c and derive the cubic polynomial fitting formula to obtain the formula y=3ax 2 +2bx+cSubstitute the values ​​of a, b, and c into it to obtain the value of the covering stiffness;

[0013] Step 8: Fit the obtained coating stiffness values ​​of each zone into a smooth curve.

[0014] Preferably, the stiffness testing machine is fixedly connected with a connecting column, the outer side of the connecting column is slidably connected with a rim, the outer side of the rim is provided with a tire, the interior of the connecting column is provided with a quick-release mechanism, the stiffness testing machine is fixedly connected with a test bench, the interior of the test bench is slidably connected with a protrusion, the test bench is in contact with a mounting seat, the mounting seat is in contact with the protrusion, the interior of the stiffness testing machine is fixedly connected with a hydraulic cylinder, the hydraulic cylinder is fixedly connected to the mounting seat, the interior of the mounting seat is provided with a replacement mechanism, and the protrusion is in contact with the tire.

[0015] Preferably, the quick-release mechanism includes a movable frame, a limit block, a tension spring, and a guide rod. The interior of the connecting column is slidably connected to the movable frame, the limit block is fixedly connected to the movable frame, the tension spring is arranged inside the movable frame, the interior of the connecting column is fixedly connected to the guide rod, and the guide rod is slidably connected to the movable frame to push the movable frame, and the movable frame drives the limit block to move and stretches the tension spring. When the limit block slides into the interior of the connecting column, it pushes the rim. When the rim moves to a predetermined position, the movable frame is released and the tension spring is reset. The tension spring can drive the limit block on the movable frame to slide into the interior of the rim through elastic force, thereby completing the assembly of the rim. Then the hydraulic cylinder is started to drive the protrusion to move, and data is recorded, thereby effectively improving the test efficiency.

[0016] Preferably, the limiting block is slidably connected to the connecting column, and the limiting block is slidably connected to the rim, and the limiting block can limit the rim.

[0017] Preferably, one end of the tension spring is fixedly connected to the connecting column, and the other end of the tension spring is fixedly connected to the movable frame. The tension spring can drive the movable frame to automatically reset through elastic force.

[0018] The cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame, and the cam is fixedly mounted on the support frame.

[0019] Preferably, the pull-down frame contacts the mounting seat, the pull-down frame is slidably connected to the hydraulic cylinder, the limit seat contacts the test bench, the limit seat is slidably connected to the mounting seat and the connecting frame, and the limit seat can limit the protrusion through the connecting frame.

[0020] Preferably, one end of the spring is fixedly connected to the mounting seat, and the other end of the spring is fixedly connected to the limit seat, and the spring can drive the limit seat to automatically reset through elastic force.

[0021] The beneficial effects of the present invention are as follows: the present invention relates to a static tire covering force nonlinear partition fitting method, which has the characteristics of high accuracy, good repeatability, and high efficiency. In specific use, compared with the traditional static tire covering force nonlinear partition fitting method, the static tire covering force nonlinear partition fitting method has the following beneficial effects:

[0022] By fitting the test data of the covering force in each interval with a cubic polynomial, the present invention can fit the test data of the loading and unloading sections into a smooth curve with high precision, which can be used to calculate tire characteristic values, conduct benchmarking analysis, or be used for tire model identification. It has the characteristics of high accuracy, good repeatability, and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and accompanying drawings.

[0024] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0025] Figure 2 For the present invention Figure 1 Front cross-sectional view of

[0026] Figure 3 For the present invention Figure 1 Right side sectional view;

[0027] Figure 4 For the present invention Figure 2 A magnified view of the structure at point A;

[0028] Figure 5 For the present invention Figure 2 A magnified view of the structure at point B;

[0029] Figure 6 For the present invention Figure 4 A top view of the pull-down rack.

[0030] In the figure: 1. Stiffness testing machine; 2. Connecting column; 3. Rim; 4. Tire; 5. Quick release mechanism; 6. Test bench; 7. Bump; 8. Mounting seat; 9. Replacement mechanism; 10. Hydraulic cylinder; 51. Movable frame; 52. Limit block; 53. Tension spring; 54. Guide rod; 91. Pull-down frame; 92. Connecting rod; 93. Limit seat; 94. Connecting frame; 95. Spring; 96. Trapezoidal block. DETAILED DESCRIPTION

[0031] like Figure 1-6 As shown, this specific embodiment adopts the following technical solutions:

[0032] Example:

[0033] A static tire covering force nonlinear partition fitting method includes the following steps:

[0034] Step 1: Select a tire 4 with good appearance quality as the test tire 4;

[0035] Step 2: After the tire 4 is assembled on the rim 3, it is inflated to the test pressure. The tire 4 is parked for a time that meets the test requirements.

[0036] Step 3: Fix the test tire 4 and rim 3 assembly to the connecting column 2 of the stiffness testing machine 1;

[0037] Step 4: Apply a vertical force to the tire 4 at the speed required by the test, loading it to the required load Fz1. Apply the required load Fz2 to the upward protrusion 7 at the contact point between the tire 4 and the test bench 6, and raise the protrusion 7 by a distance S.

[0038] Step 5: Draw a scatter plot of the test data of the bump 7 load and the bump 7 displacement, with the distance the bump 7 is raised as the horizontal coordinate and the load of the bump 7 as the vertical coordinate;

[0039] Step 6: Divide the test data scatter plot into zones according to the test load, which are 0%-30%, 30%-60%, 60%-90% of the test load in the loading section and 0%-30%, 30%-60%, 60%-90% of the test load in the unloading section;

[0040] Step 7: Fit the test data of each area with a cubic polynomial. Set the fitting formula as y = ax 3 +bx 2 +cx+d, find the values ​​of constants a, b, and c and derive the cubic polynomial fitting formula to obtain the formula y=3ax 2 +2bx+cSubstitute the values ​​of a, b, and c into it to obtain the value of the covering stiffness;

[0041] Step 8: Fit the obtained coating stiffness values ​​of each zone into a smooth curve.

[0042] Among them, the stiffness testing machine 1 is fixedly connected to a connecting column 2, the outer side of the connecting column 2 is slidably connected to a rim 3, the outer side of the rim 3 is provided with a tire 4, the stiffness testing machine 1 is fixedly connected to a test bench 6, the inside of the test bench 6 is slidably connected to a bump 7, the test bench 6 is in contact with a mounting seat 8, the mounting seat 8 is in contact with the bump 7, the inside of the stiffness testing machine 1 is fixedly connected to a hydraulic cylinder 10, the hydraulic cylinder 10 is fixedly connected to the mounting seat 8, and the bump 7 is in contact with the tire 4.

[0043] The interior of the connecting column 2 is provided with a quick release mechanism 5, which includes a movable frame 51, a limit block 52, a tension spring 53, and a guide rod 54. The interior of the connecting column 2 is slidably connected to the movable frame 51, the limit block 52 is fixedly connected to the movable frame 51, and a tension spring 53 is provided inside the movable frame 51. The interior of the connecting column 2 is fixedly connected to the guide rod 54, and the guide rod 54 is slidably connected to the movable frame 51, pushing the movable frame 51, and the movable frame 51 drives the limit block 52 to move and stretches the tension spring 53. When the limit block 52 slides into the interior of the connecting column 2, it pushes the rim 3. When the rim 3 moves to a predetermined position, Loosen the movable frame 51 and the tension spring 53 resets. The tension spring 53 can drive the limit block 52 on the movable frame 51 to slide into the inside of the rim 3 through elastic force, and the assembly of the rim 3 can be completed. Then start the hydraulic cylinder 10 to drive the protrusion 7 to move and record the data, which can effectively improve the test efficiency. The limit block 52 is slidingly connected to the connecting column 2, and the limit block 52 is slidingly connected to the rim 3. The limit block 52 can limit the rim 3. One end of the tension spring 53 is fixedly connected to the connecting column 2, and the other end of the tension spring 53 is fixedly connected to the movable frame 51. The tension spring 53 can drive the movable frame 51 to automatically reset through elastic force.

[0044] Among them, the interior of the mounting seat 8 is provided with a replacement mechanism 9, and the replacement mechanism 9 includes a lower pull-up frame 91, a connecting rod 92, a limit seat 93, a connecting frame 94, a spring 95, and a trapezoidal block 96. The interior of the mounting seat 8 is slidably connected with a connecting rod 92, one end of the connecting rod 92 is fixedly connected to the lower pull-up frame 91, and the other end of the connecting rod 92 is fixedly connected to the limit seat 93. The outer side of the protrusion 7 is fixedly connected to a connecting frame 94, and a spring 95 is provided on the outer side of the connecting rod 92. The outer side of the protrusion 7 is fixedly connected to a trapezoidal block 96, and the trapezoidal block 96 is slidably connected to the mounting seat 8. The connecting frame 94 is slidably connected to the mounting seat 8, and the output end of the hydraulic cylinder 10 is recovered so that when the protrusion 7 is separated from the test bench 6, the hydraulic cylinder 10 is stopped, and then the lower pull-up frame 91 is pulled. The lower pull-up frame 91 drives the limit seat 93 to move through the connecting rod 92, and When the spring 95 is compressed, the limit seat 93 is disengaged from the connecting frame 94, and the protrusion 7 can slide down from the mounting seat 8, and then the trapezoidal block 96 on the new protrusion 7 can slide into the inside of the mounting seat 8. After sliding to the predetermined position, the lower pull-up frame 91 is released, and the spring 95 can drive the limit seat 93 to slide into the inside of the connecting frame 94 through the elastic force, so that the replacement can be completed conveniently. The lower pull-up frame 91 contacts the mounting seat 8, and the lower pull-up frame 91 is slidably connected to the hydraulic cylinder 10. The limit seat 93 contacts the test bench 6, and the limit seat 93 is slidably connected to the mounting seat 8 and the connecting frame 94. The limit seat 93 can limit the protrusion 7 through the connecting frame 94. One end of the spring 95 is fixedly connected to the mounting seat 8, and the other end of the spring 95 is fixedly connected to the limit seat 93. The spring 95 can automatically reset the limit seat 93 through the elastic force.

[0045] The use state of the present invention is as follows: when in use, after the tire 4 and the rim 3 are combined, the rim 3 is put on the outside of the connecting column 2, and then the movable frame 51 is pushed. The movable frame 51 drives the limit block 52 to move and stretches the tension spring 53. When the limit block 52 slides into the interior of the connecting column 2, the rim 3 is pushed. When the rim 3 moves to a predetermined position, the movable frame 51 is released and the tension spring 53 is reset. The tension spring 53 can drive the limit block 52 on the movable frame 51 to slide into the interior of the rim 3 through elastic force, and the assembly of the rim 3 is completed. Then, the hydraulic cylinder 10 is started to drive the protrusion 7 to move, and the data is recorded, thereby effectively improving the test efficiency.

[0046] When it is necessary to replace the bump 7 of other shapes, recycle the output end of the hydraulic cylinder 10, so that the bump 7 is separated from the test bench 6, stop the hydraulic cylinder 10, and then pull the lower pull-down frame 91. The lower pull-down frame 91 drives the limit seat 93 to move through the connecting rod 92 and compresses the spring 95. When the limit seat 93 is separated from the connecting frame 94, the bump 7 can be slid off the mounting seat 8, and then the trapezoidal block 96 on the new bump 7 can be slid into the inside of the mounting seat 8. After sliding to the predetermined position, release the lower pull-down frame 91, and the spring 95 can drive the limit seat 93 to slide into the inside of the connecting frame 94 through elastic force, so that the replacement can be completed conveniently.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A static tire covering force nonlinear partition fitting method, comprising the following steps: Step 1: Select a tire (4) with good appearance quality as a test tire (4); Step 2: After the tire (4) is assembled on the rim (3), it is inflated to the pressure required by the test, and the parking time of the tire (4) must meet the test requirements; Step 3: Fix the test tire (4) and rim (3) assembly to the connecting column (2) of the stiffness testing machine (1); Step 4: Apply a vertical force to the tire (4) at a speed required by the test, loading it to the load Fz1 required by the test, apply the test required load Fz2 of the upward convex block (7) at the contact point between the tire (4) and the test bench (6), and raise the convex block (7) by a distance S; Step 5: Using the distance the bump (7) is lifted as the horizontal coordinate and the load of the bump (7) as the vertical coordinate, a scatter plot of the test data of the bump (7) load and the bump (7) displacement is drawn; Step 6: Divide the test data scatter plot into zones according to the test load, which are 0%-30%, 30%-60%, 60%-90% of the test load in the loading section and 0%-30%, 30%-60%, 60%-90% of the test load in the unloading section; Step 7: Fit the test data of each area with a cubic polynomial. Set the fitting formula as y = ax 3 +bx 2 +cx+d, find the values ​​of constants a, b, and c and derive the cubic polynomial fitting formula to obtain the formula y=3ax 2 +2bx+cSubstitute the values ​​of a, b, and c into it to obtain the value of the covering stiffness; Step 8: Fit the obtained coating stiffness values ​​of each zone into a smooth curve.

2. The static tire covering force nonlinear partition fitting method according to claim 1, characterized in that: The stiffness testing machine (1) is fixedly connected to a connecting column (2), the outer side of the connecting column (2) is slidably connected to a rim (3), the outer side of the rim (3) is provided with a tire (4), the interior of the connecting column (2) is provided with a quick release mechanism (5), the stiffness testing machine (1) is fixedly connected to a test bench (6), the interior of the test bench (6) is slidably connected to a protrusion (7), the test bench (6) is in contact with a mounting seat (8), the mounting seat (8) is in contact with the protrusion (7), the interior of the stiffness testing machine (1) is fixedly connected to a hydraulic cylinder (10), the hydraulic cylinder (10) is fixedly connected to the mounting seat (8), the interior of the mounting seat (8) is provided with a replacement mechanism (9), and the protrusion (7) is in contact with the tire (4).

3. The static tire covering force nonlinear partition fitting method according to claim 2, characterized in that: The quick-release mechanism (5) comprises a movable frame (51), a limit block (52), a tension spring (53), and a guide rod (54); the interior of the connecting column (2) is slidably connected to the movable frame (51); the limit block (52) is fixedly connected to the movable frame (51); the interior of the movable frame (51) is provided with a tension spring (53); the interior of the connecting column (2) is fixedly connected to the guide rod (54); the guide rod (54) is slidably connected to the movable frame (51).

4. The static tire covering force nonlinear partition fitting method according to claim 3, characterized in that: The limiting block (52) is slidably connected to the connecting column (2), and the limiting block (52) is slidably connected to the rim (3).

5. The static tire covering force nonlinear partition fitting method according to claim 3, characterized in that: One end of the tension spring (53) is fixedly connected to the connecting column (2), and the other end of the tension spring (53) is fixedly connected to the movable frame (51).

6. The static tire covering force nonlinear partition fitting method according to claim 2, characterized in that: The replacement mechanism (9) includes a pull-down frame (91), a connecting rod (92), a limiting seat (93), a connecting frame (94), a spring (95), and a trapezoidal block (96). The interior of the mounting seat (8) is slidably connected to the connecting rod (92). One end of the connecting rod (92) is fixedly connected to the pull-down frame (91). The other end of the connecting rod (92) is fixedly connected to the limiting seat (93). The outer side of the protrusion (7) is fixedly connected to the connecting frame (94). The outer side of the connecting rod (92) is provided with a spring (95). The outer side of the protrusion (7) is fixedly connected to the trapezoidal block (96). The trapezoidal block (96) is slidably connected to the mounting seat (8), and the connecting frame (94) is slidably connected to the mounting seat (8).

7. The static tire covering force nonlinear partition fitting method according to claim 6, characterized in that: The pull-down frame (91) contacts the mounting seat (8), the pull-down frame (91) is slidably connected to the hydraulic cylinder (10), the limit seat (93) contacts the test bench (6), and the limit seat (93) is slidably connected to the mounting seat (8) and the connecting frame (94).

8. The static tire covering force nonlinear partition fitting method according to claim 6, characterized in that: One end of the spring (95) is fixedly connected to the mounting seat (8), and the other end of the spring (95) is fixedly connected to the limiting seat (93).

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