A design method for automobile door glass groove

Abstract

The present application relates to the field of automobile sealing technology, and discloses a method for designing a groove of automobile door glass, including the following steps: S1, lip positioning: positioning the outer lip and the inner lip to form a sealing structure; S2, CLD curve: testing the lip CLD curve to determine the compression range; S3, holding force and friction: calculating the total holding force and friction; S4, offset analysis: measuring the interference, CLD value and holding force change when the glass is offset; S5, variation range: measuring the variation range of the interference and CLD values ​​to limit the sealing space; S6, thickness range: determining the glass thickness range according to the interference and CLD values; S7, balance rate: calculating the holding force balance rate and checking the distribution. By accurately positioning the outer lip and the inner lip, and drawing the CLD curve to determine the reasonable compression range, a good sealing effect is maintained between the lip and the glass, thereby effectively reducing the possibility of wind noise and dust entering the car.

Description

Technical Field

[0001] The invention relates to the technical field of automobile sealing, in particular to a method for designing a glass groove of an automobile door. Background Art

[0002] With the rapid development of the automobile industry, the requirements for automobile comfort, sealing and durability are increasing day by day. The automobile door glass groove is an important part of the door sealing system, which is mainly used to isolate wind noise, prevent rain and dust from entering the car, and provide necessary support and sealing effect during the lifting and lowering process of the door glass. In the traditional door glass groove design, rubber or polymer materials are usually used to form a sealing contact with the glass through the outer lip and inner lip.

[0003] However, there are some problems with the existing technology, which cannot meet the increasingly stringent sealing and operation requirements. First, the traditional groove design usually only considers the sealing performance under static conditions, ignoring the sealing adaptability between the lip and the glass during glass offset, thickness change and dynamic operation of the door. Since the compression of the inner and outer lips cannot be effectively adjusted, problems such as increased wind noise and rainwater leakage occur when driving at high speeds, which seriously affects the sealing performance and comfort of the vehicle.

[0004] Secondly, the existing door glass groove design is usually optimized for a specific glass thickness, with poor adaptability and unable to meet the universal requirements of different glass thicknesses or multiple models. This limitation requires the design of each glass thickness and model to be adjusted independently, increasing design and production costs and reducing the versatility and flexibility of the solution.

[0005] Finally, friction is an important design factor in the process of raising and lowering the door glass. The traditional groove design makes it difficult to accurately control the support force and friction of the inner and outer lips, resulting in too much or too little resistance when the glass is raised and lowered. Too much resistance will lead to difficulty in operation, while too little resistance may cause problems with poor sealing. In addition, after a period of use, the glass is prone to changes in friction due to aging or deformation of the lips, further affecting its sliding smoothness and sealing effect. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a method for designing a glass groove for a car door, which solves the problems of unstable sealing performance, poor sliding resistance control and poor durability of the existing glass groove for a car door during glass thickness changes, position displacement and dynamic operation.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for designing a groove of a car door glass comprises the following steps:

[0008] S1. Positioning of outer lip and inner lip: Preliminary positioning of the outer lip and inner lip in the door glass groove to form a basic sealing structure and determine the contact position between the lip and the glass;

[0009] S2. CLD curve drawing: Test and calculate the CLD relationship curves of the outer lip and inner lip under different compression amounts to determine the design compression range of the lip;

[0010] S3. Calculation of holding force and friction force: Based on the compression range determined by the CLD curve, the sum of the holding force of the outer lip and the inner lip is calculated as the total holding force, and the friction force of the glass in the groove is calculated in combination with the friction coefficient;

[0011] S4. Glass offset analysis: When the glass position is offset, measure and calculate the interference of the inner and outer lips, CLD value and the dynamic change of the holding force;

[0012] S5. Determine the variation range of interference and CLD value: Under different glass offsets, measure the variation range of interference and CLD value of inner and outer lips to limit the sealing adaptation space in the design;

[0013] S6. Determine the range of glass thickness variation: Calculate and determine the thickness variation range of the door glass based on the variation range of the interference amount and the CLD value;

[0014] S7. Balance rate calculation: Calculate the balance rate of the holding force of the inner and outer lips, and check the distribution of the holding force on the lips.

[0015] Preferably, in step S2, the CLD curve is used to describe the clamping force of the outer lip and the inner lip under different compression amounts, and the calculation formula of the CLD value is:

[0016]

[0017] Where F is the clamping force of the lip and L is the length of the lip.

[0018] Preferably, in step S2, the design compression range of the lip is determined by a CLD curve, and the CLD value range is determined according to the glass thickness and design requirements.

[0019] Preferably, in step S3, the holding force is calculated by the following formula:

[0020] F total =F o +F i

[0021] where F o is the CLD value of the outer lip, F i is the CLD value of the inner lip.

[0022] Preferably, in step S3, the friction force is calculated by the following formula:

[0023] F 摩擦 =F total ×μ

[0024] Where μ is the friction coefficient between the glass and the inner and outer lips.

[0025] Preferably, in the step S4, the interference amount of the inner and outer lips is determined by setting the offset of the glass and measuring the change in the contact position of the glass with the inner and outer lips after the offset to determine the increase or decrease of the interference amount;

[0026] The CLD value of the inner and outer lips is calculated by re-measuring the compression of the inner and outer lips under the set glass offset, and determining the corresponding clamping force through the CLD curve to calculate the new CLD value;

[0027] The following variation of the inner and outer lip holding forces is used to calculate a new holding force according to the CLD values ​​of the inner and outer lips after the offset, so as to confirm the clamping state of the glass at the offset position.

[0028] Preferably, in step S5, the variation range of the interference amount of the inner and outer lips is calculated by the following steps:

[0029] S11, initial interference measurement: determine by detecting the distance between the contact position between the glass and the lip;

[0030] S12, offset position interference measurement: offset the glass to the set offset position and remeasure the distance between the inner and outer lips and the contact position of the glass, so as to determine the interference amount after offset;

[0031] S13. Calculate the variation range of the inner and outer lip interference values, that is, the maximum and minimum interference values ​​at different glass positions, through the interference value data at the initial position and the offset position.

[0032] Preferably, in step S5, the CLD value variation range is calculated by the following steps:

[0033] S21. Initial CLD value measurement: At the initial position of the glass, the CLD value at the initial position is determined by measuring the compression of the inner and outer lips and combining the CLD curve;

[0034] S22, CLD value measurement at offset position: offset the glass to different set positions, re-measure the compression of the lip, and calculate the CLD value of each offset position with reference to the CLD curve;

[0035] S23. Calculation of the variation range of the CLD value: Compare the CLD value data of the initial position and the offset position, and calculate the variation range of the CLD value, that is, the maximum and minimum CLD values ​​at different glass positions.

[0036] Preferably, in step S6, the variable range of the thickness of the door glass is specifically calculated by the following steps:

[0037] S31, measuring the interference amount of the inner and outer lips at different offset positions and the corresponding CLD value variation range;

[0038] S32, selecting a glass thickness range that meets the design CLD value requirements according to the measured interference amount and CLD value range;

[0039] S33. By comparing the adaptability of glasses of different thicknesses within the range of interference and CLD values, the maximum thickness and minimum thickness of the door glass are determined, thereby limiting the thickness variation range of the glass.

[0040] Preferably, in step S7, the balance rate C is calculated by the following formula:

[0041]

[0042] Among them, F i is the support force of the inner lip, F o The design target of the balance ratio C is close to 1 for the support force of the outer lip.

[0043] The present invention provides a method for designing a groove for a car door glass. It has the following beneficial effects:

[0044] 1. The present invention accurately locates the outer lip and the inner lip and draws the CLD curve to determine a reasonable compression range, so as to maintain a good sealing effect between the lip and the glass. Even when the glass is offset, the interference amount of the inner and outer lips and the dynamic change analysis of the CLD value can ensure that the sealing is not affected, thereby effectively reducing the possibility of wind noise, dust and moisture entering the vehicle, and significantly improving the sealing performance of the vehicle.

[0045] 2. The present invention determines the variable range of glass thickness by analyzing the interference of the inner and outer lips and the variation range of the CLD value, thereby ensuring that glasses of different thicknesses can achieve a stable sealing effect during the installation process. This flexibility enables the design to adapt to the glass thickness requirements of different vehicle models, reduces limitations in the design and production process, and improves the versatility and applicability of the solution.

[0046] 3. The present invention ensures that the glass can slide smoothly and unhindered in the groove by calculating the support force and friction force of the outer lip and the inner lip. Under the premise of ensuring that the glass and the lip remain sealed, this method controls the friction force within a reasonable range to avoid difficulties in lifting and lowering the glass due to excessive friction or poor sealing due to too small friction. This design significantly improves the sliding smoothness of the car door glass and enhances the user experience.

[0047] 4. The present invention ensures that the clamping forces of the two are evenly distributed by calculating the balance rate of the holding forces of the inner and outer lips, thereby avoiding structural deformation and wear problems caused by uneven force on the lips. The balanced distribution of holding forces not only improves the long-term stability of the seal, but also extends the service life of the groove structure and improves the overall durability of the sealing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a flow chart of the steps of the present invention;

[0049] Figure 2 A flow chart of the steps for calculating the variation range of the interference amount of the inner and outer lips of the present invention;

[0050] Figure 3 This is a flow chart of the steps for calculating the CLD value variation range of the present invention;

[0051] Figure 4 A flow chart of the steps for calculating the variable range of thickness of the door glass of the present invention;

[0052] Figure 5 It is a data curve schematic diagram of the present invention;

[0053] Figure 6 It is a schematic diagram of the data change curve of the present invention. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Embodiment 1:

[0056] Please refer to the attached Figure 1 -Attached Figure 4 The embodiment of the present invention provides a method for designing a groove of a car door glass, comprising the following steps:

[0057] S1. Positioning of outer lip and inner lip: Preliminary positioning of the outer lip and inner lip in the door glass groove to form a basic sealing structure and determine the contact position between the lip and the glass;

[0058] S2. CLD curve drawing: Test and calculate the CLD relationship curves of the outer lip and inner lip under different compression amounts to determine the design compression range of the lip;

[0059] S3. Calculation of holding force and friction force: Based on the compression range determined by the CLD curve, the sum of the holding force of the outer lip and the inner lip is calculated as the total holding force, and the friction force of the glass in the groove is calculated in combination with the friction coefficient;

[0060] S4. Glass offset analysis: When the glass position is offset, measure and calculate the interference of the inner and outer lips, CLD value and the dynamic change of the holding force;

[0061] S5. Determine the variation range of interference and CLD value: Under different glass offsets, measure the variation range of interference and CLD value of inner and outer lips to limit the sealing adaptation space in the design;

[0062] S6. Determine the range of glass thickness variation: Calculate and determine the thickness variation range of the door glass based on the variation range of the interference amount and the CLD value;

[0063] S7, balance rate calculation: calculate the balance rate of the holding force of the inner and outer lips, and check the distribution of the holding force of the lips;

[0064] In step S2, the CLD curve is used to describe the clamping force of the outer lip and inner lip under different compression amounts. The calculation formula of the CLD value is:

[0065]

[0066] Where F is the clamping force of the lip, and L is the length of the lip;

[0067] In step S2, the design compression range of the lip is determined by the CLD curve, and the CLD value range is determined according to the glass thickness and design requirements;

[0068] In step S3, the friction force is calculated by the following formula:

[0069] F 摩擦 =F total ×μ

[0070] Where μ is the friction coefficient between the glass and the inner and outer lips;

[0071] In step S4, the interference amount of the inner and outer lips is determined by setting the offset of the glass and measuring the change in the contact position of the glass with the inner and outer lips after the offset to determine the increase or decrease of the interference amount;

[0072] The CLD value of the inner and outer lips is calculated by re-measuring the compression of the inner and outer lips under the set glass offset, and determining the corresponding clamping force through the CLD curve to calculate the new CLD value;

[0073] The following variation of the inner and outer lip holding force is used to calculate the new holding force according to the CLD value of the inner and outer lips after the offset, so as to confirm the clamping state of the glass at the offset position;

[0074] In step S5, the variation range of the interference amount of the inner and outer lips is calculated by the following steps:

[0075] S11, initial interference measurement: determine by detecting the distance between the contact position between the glass and the lip;

[0076] S12, offset position interference measurement: offset the glass to the set offset position and remeasure the distance between the inner and outer lips and the contact position of the glass, so as to determine the interference amount after offset;

[0077] S13, calculating the variation range of the inner and outer lip interference values, that is, the maximum and minimum interference values ​​at different glass positions, through the interference value data at the initial position and the offset position;

[0078] In step S5, the CLD value variation range is calculated by the following steps:

[0079] S21. Initial CLD value measurement: At the initial position of the glass, the CLD value at the initial position is determined by measuring the compression of the inner and outer lips and combining the CLD curve;

[0080] S22, CLD value measurement at offset position: offset the glass to different set positions, re-measure the compression of the lip, and calculate the CLD value of each offset position with reference to the CLD curve;

[0081] S23, CLD value variation range calculation: Compare the CLD value data of the initial position and the offset position, and calculate the variation range of the CLD value, that is, the maximum and minimum CLD values ​​at different glass positions;

[0082] In step S6, the variable range of the thickness of the door glass is calculated specifically by the following steps:

[0083] S31, measuring the interference amount of the inner and outer lips at different offset positions and the corresponding CLD value variation range;

[0084] S32, selecting a glass thickness range that meets the design CLD value requirements according to the measured interference amount and CLD value range;

[0085] S33, by comparing the adaptation of glasses of different thicknesses within the range of interference and CLD values, determining the maximum thickness and minimum thickness of the door glass, and thus limiting the thickness variation range of the glass;

[0086] In step S7, the balance rate C is calculated by the following formula:

[0087]

[0088] Among them, F i is the support force of the inner lip, Fo The design target of the balance ratio C is close to 1 for the support force of the outer lip.

[0089] Specifically, a series of steps are used to achieve stable sealing and smooth operation of the door glass in different positions. First, the basic sealing structure is formed by positioning the outer lip and the inner lip, and ensuring good contact between the lip and the glass, laying the foundation for subsequent steps.

[0090] Next, the CLD curves of the outer lip and the inner lip are drawn to describe the clamping force of the lip under different compression amounts, thereby determining the design compression range of the lip so that effective sealing can still be guaranteed under different glass thicknesses and positions.

[0091] Afterwards, the total holding force is obtained by calculating the sum of the holding forces of the outer lip and the inner lip, and the friction force of the glass in the groove is calculated in combination with the friction coefficient, thereby ensuring that the glass can maintain sealing during the sliding process and will not cause operational difficulties due to excessive friction.

[0092] When the glass is offset, the change in sealing performance can be evaluated in real time by analyzing the change in the offset to the inner and outer lip interference, CLD value and holding force. By further calculating the change range of interference and CLD value, the sealing adaptation space in the design is limited to ensure the sealing stability in different positions.

[0093] Based on the above measurement data, this method can also calculate and determine the variable range of the door glass thickness, so as to meet the installation requirements of glass with different thicknesses. In addition, the calculation of the balance rate ensures that the support force of the inner and outer lips is evenly distributed, which helps to improve the stability and durability of the sealing structure.

[0094] Please refer to the attached Figure 5 -Attached Figure 6 Embodiment 2: Design method of automobile door glass groove based on 4mm glass

[0095] Background:

[0096] This embodiment takes 4 mm thick glass as an example to demonstrate how to determine the design parameters of the inner and outer lips, including interference, CLD value, holding force and friction, etc., through the automobile door glass groove design method, and calculate the variable range of glass thickness.

[0097] Positioning of outer and inner lips

[0098] First, the outer lip and inner lip are initially positioned in the door glass groove to form a contact sealing structure with the 4mm thick glass. The outer lip and inner lip are in contact with the outer and inner sides of the glass respectively to provide sealing and support.

[0099] CLD curve drawing:

[0100] According to the measurement results, the CLD curves of the inner and outer lips are drawn, that is, the CLD relationship curves under different compression amounts, to determine the design compression range of the lip.

[0101] Outer lip compression: When the compression is 2.5mm, the CLD value is 4.5N.

[0102] Inner lip compression: When the compression is 3.5mm, the CLD value is also 4.5N.

[0103] The initial CLD values ​​of the inner and outer lips are obtained as 4.5N respectively.

[0104] Calculation of holding force:

[0105] Using the compression range determined by the CLD curve, the sum of the holding forces of the outer lip and the inner lip is calculated as the total holding force.

[0106] F total =F o +F i =4.5N+4.5N

[0107] Friction calculation:

[0108] When the total holding force is known, the friction force of the glass is calculated in combination with the friction coefficient μ=0.3\mu=0.3μ=0.3 to ensure that the glass slides smoothly in the groove.

[0109] F 摩擦 =F total ×μ=9×0.3=2.7

[0110] Glass offset analysis:

[0111] Assuming that the glass may shift during use, for example, shifting inward by 0.5 mm and 0.25 mm, the interference of the inner and outer lips, the CLD value, and the dynamic change of the holding force are calculated.

[0112] When the glass is offset by 0.5 mm:

[0113] Inner lip interference: 4mm, CLD value rises to 16N.

[0114] Outer lip interference: 2mm, CLD value rises to 2.8N.

[0115] The total support force is:

[0116] F 偏移 =16+2.8=18.8N

[0117] When the glass is offset by 0.25mm:

[0118] Inner lip interference: 3.75mm, CLD value is 6N.

[0119] Outer lip interference: 2.25mm, CLD value is 3.5N.

[0120] The total support force is:

[0121] F 偏移 =6+3.5=9.5N

[0122] Determination of glass thickness variation range:

[0123] By analyzing the variation range of interference and CLD values, the variable range of glass thickness is determined. For different glass thicknesses, the adaptation of interference and CLD values ​​within the design range is measured.

[0124] In this embodiment, the interference value varies in a range of 2 mm to 4 mm, and the CLD value varies in a range of 5N to 11N.

[0125] By comparison, it was found that the variable range of glass thickness is 2.0mm to 4.4mm, to ensure that glass of different thicknesses can be effectively sealed in the groove.

[0126] Balance rate calculation:

[0127] Calculate the balance ratio of the inner and outer lips to ensure even distribution of clamping force.

[0128]

[0129] The balance rate is 1, indicating that the holding force of the inner and outer lips is evenly distributed, meeting the design requirements.

[0130] in conclusion:

[0131] This embodiment uses specific calculations for 4mm thick glass to demonstrate how to use "a method for designing a groove for automobile door glass" to determine the interference amount, CLD value, holding force and friction force of the inner and outer lips, and thereby deduce the variable range of glass thickness.

[0132] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for designing a groove of a car door glass, characterized in that: The following steps are involved: S1. Positioning of outer lip and inner lip: Preliminary positioning of the outer lip and inner lip in the door glass groove to form a basic sealing structure and determine the contact position between the lip and the glass; S2. CLD curve drawing: Test and calculate the CLD relationship curves of the outer lip and inner lip under different compression amounts to determine the design compression range of the lip; S3. Calculation of holding force and friction force: Based on the compression range determined by the CLD curve, the sum of the holding force of the outer lip and the inner lip is calculated as the total holding force, and the friction force of the glass in the groove is calculated in combination with the friction coefficient; S4. Glass offset analysis: When the glass position is offset, measure and calculate the interference of the inner and outer lips, CLD value and the dynamic change of the holding force; S5. Determine the variation range of interference and CLD value: Under different glass offsets, measure the variation range of interference and CLD value of inner and outer lips to limit the sealing adaptation space in the design; S6. Determine the range of glass thickness variation: Calculate and determine the thickness variation range of the door glass based on the variation range of the interference amount and the CLD value; S7. Balance rate calculation: Calculate the balance rate of the holding force of the inner and outer lips, and check the distribution of the holding force on the lips.

2. A method for designing a groove for a car door glass according to claim 1, characterized in that: In the S2 step, the CLD curve is used to describe the clamping force of the outer lip and the inner lip under different compression amounts. The calculation formula of the CLD value is: Where F is the clamping force of the lip and L is the length of the lip.

3. A method for designing a groove for a car door glass according to claim 1, characterized in that: In the step S2, the design compression range of the lip is determined by the CLD curve, and the CLD value range is determined according to the glass thickness and design requirements.

4. A method for designing a groove for a car door glass according to claim 1, characterized in that: In step S3, the holding force is calculated by the following formula: F total =F o +F i Among them, F o is the CLD value of the outer lip, F i is the CLD value of the inner lip.

5. The method for designing a groove for a car door glass according to claim 1, characterized in that: In step S3, the friction force is calculated by the following formula: F 摩擦 =F total ×μ Where μ is the friction coefficient between the glass and the inner and outer lips.

6. A method for designing a groove for a car door glass according to claim 1, characterized in that: In the step S4, the interference amount of the inner and outer lips is determined by setting the offset of the glass and measuring the change in the contact position of the glass with the inner and outer lips after the offset to determine the increase or decrease of the interference amount; The CLD value of the inner and outer lips is calculated by re-measuring the compression of the inner and outer lips under the set glass offset, and determining the corresponding clamping force through the CLD curve to calculate the new CLD value; The following variation of the inner and outer lip holding forces is used to calculate a new holding force according to the CLD values ​​of the inner and outer lips after the offset, so as to confirm the clamping state of the glass at the offset position.

7. A method for designing a groove for a car door glass according to claim 1, characterized in that: In step S5, the variation range of the interference amount of the inner and outer lips is calculated by the following steps: S11, initial interference measurement: determine by detecting the distance between the contact position between the glass and the lip; S12, offset position interference measurement: offset the glass to the set offset position and remeasure the distance between the inner and outer lips and the contact position of the glass, so as to determine the interference amount after offset; S13. Calculate the variation range of the inner and outer lip interference values, that is, the maximum and minimum interference values ​​at different glass positions, through the interference value data at the initial position and the offset position.

8. The method for designing a groove for a car door glass according to claim 1, characterized in that: In step S5, the CLD value variation range is calculated by the following steps: S21. Initial CLD value measurement: At the initial position of the glass, the CLD value at the initial position is determined by measuring the compression of the inner and outer lips and combining the CLD curve; S22, CLD value measurement at offset position: offset the glass to different set positions, re-measure the compression of the lip, and calculate the CLD value of each offset position with reference to the CLD curve; S23. Calculation of the variation range of the CLD value: Compare the CLD value data of the initial position and the offset position, and calculate the variation range of the CLD value, that is, the maximum and minimum CLD values ​​at different glass positions.

9. A method for designing a groove for a car door glass according to claim 1, characterized in that: In step S6, the variable range of the thickness of the door glass is calculated specifically by the following steps: S31, measuring the interference amount of the inner and outer lips at different offset positions and the corresponding CLD value variation range; S32, selecting a glass thickness range that meets the design CLD value requirements according to the measured interference amount and CLD value range; S33. By comparing the adaptability of glasses of different thicknesses within the range of interference and CLD values, the maximum thickness and minimum thickness of the door glass are determined, thereby limiting the thickness variation range of the glass.

10. The method for designing a groove of a car door glass according to claim 1, characterized in that: In step S7, the balance rate C is calculated by the following formula: Among them, F i is the support force of the inner lip, F o The design target of the balance ratio C is close to 1 for the support force of the outer lip.

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