A simplified calculation method for door sealing force

Abstract

The present invention discloses a simplified calculation method for the sealing force of a vehicle door. The method comprises the steps of determining input calculation conditions in a design phase, defining the position of the center of mass of a vehicle door strip, calculating the force at the center of mass of the vehicle door sealing strip, and simply calculating the sealing force of the vehicle door. According to the difference in force or position, the vehicle door sealing strip or the door opening sealing strip is divided into different force areas, the center of mass of each section of the sealing strip is determined, the force at the center of mass position is calculated according to the unit ballast of different sections analyzed by CAE, and the theoretically required closing force F at the handle position is determined according to the principle of moment balance. The method has the characteristics of simple calculation, high success rate, and relatively accurate calculation results.

Description

Technical Field

[0001] The invention relates to the field of automobile technology, and in particular to a simplified calculation method for the sealing force of a vehicle door. Background Art

[0002] The car door is one of the movable parts of the car and is a part that is used very frequently by passengers. The car glass is installed in the door frame of the car door. There is no car glass on the side of the door frame close to the B-pillar where the door frame meets the car glass. The door frame at this position overlaps the frame, and there is a connection angle between the waistline of the door frame and the B-pillar of the car body. A door opening strip is set at the corner to form a sealing structure.

[0003] The car door sealing system includes the car door, the body side and the sealing strip. The sealing strip is installed along the sheet metal stop of the body side, and the cross section around the door opening is consistent. The front side of the car door is connected and fixed to the body side through a hinge. When the car door rotates around the hinge axis, the inner panel of the door contacts the hollow bubble tube of the sealing strip and gradually compresses the bubble tube of the sealing strip, generating pressure between the two. In the design process of a new car model, the design of the sealing strip and the calculation of the sealing force of the car door are often difficult links. The previous calculation method is often segmented integration and then accumulation. The calculation method is complicated and prone to errors. It is difficult for people with a poor foundation in mathematical theory and requires repeated calculations, which troubles many designers. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention conceives a simplified calculation method for the vehicle door sealing force, which uses the torque balance method to calculate the operating force at the position of the vehicle door outer opening handle, namely the vehicle door sealing force, thereby simplifying the calculation method, optimizing the calculation speed and shortening the design cycle.

[0005] The technical solution adopted to realize the present invention is: a simplified calculation method for the sealing force of a vehicle door, characterized in that it comprises the following steps:

[0006] 1) Determine the input calculation conditions in the design phase:

[0007] According to the theoretical position of the door hinge axis, the door side panel, CAS or the position of the external opening handle, the theoretical ballast of the door sealing strip, door opening sealing strip and lower sealing strip section is determined respectively as the input calculation conditions in the design stage;

[0008] 2) Define the center of mass of the door strip:

[0009] According to the different forces or positions of the door sealing strip, the door opening sealing strip and the lower sealing strip, they are divided into different force-bearing areas. A force point is selected in each force-bearing area, and this force point is regarded as the centroid position of this section of the sealing strip. The centroid of the door strip at each position is defined respectively;

[0010] 3) Calculation of the center of mass force of the door sealing strip:

[0011] According to the actual position of the door hinge, determine the position of the hinge axis. According to the unit ballast of different sections analyzed by CAE, calculate the force at each center of mass position confirmed in step 2). Assume that the force Pi is Fi.

[0012] Then Fi=L i长 *F s

[0013] Where: L i长 is the length of the sealing strip at point Pi, F s Ballast for sealing strip per unit length;

[0014] 4) Simple calculation of door sealing force

[0015] According to the torque balance principle,

[0016]

[0017] F is the theoretical door closing force required for the handle position, i.e., the door sealing force; Li is the distance from the set center of mass to the door hinge axis; and L is the distance from the handle force application point to the door hinge axis;

[0018]

[0019] Further, in the step 2), the door strip centroids are defined as 9 positions, namely P1, P2, P3, P4, P5, P6, P7, P8, and P9.

[0020] The beneficial effects of the simplified calculation method of the vehicle door sealing force of the present invention are as follows:

[0021] A simplified calculation method for the sealing force of a vehicle door. In the design stage of a vehicle door, according to different forces or positions, a vehicle door sealing strip or a door opening sealing strip is divided into different force-bearing areas. A force point is selected in each force-bearing area, and this force point is regarded as the centroid of each section of the sealing strip. According to the unit ballast of different sections analyzed by CAE, the force magnitude at the centroid position is calculated. According to the principle of moment balance, the theoretical closing force F required for the handle position is determined. The method has the characteristics of simple calculation, high success rate and relatively accurate calculation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an input condition diagram of a simplified calculation method for the sealing force of a vehicle door;

[0023] Figure 2 It is the door opening seal ballast input diagram;

[0024] Figure 3 It is the ballast input diagram of each position of the door opening seal strip;

[0025] Figure 4It is a schematic diagram of the position of the door hinge axis;

[0026] Figure 5 It is a schematic diagram of the centroid position of the door opening sealing strip;

[0027] Figure 6 This is a schematic diagram of the force calculation of the center of mass of the door sealing strip; DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-6 The present invention is further described in detail with reference to the specific embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] A simplified calculation method for the sealing force of a vehicle door comprises the following steps:

[0030] Determine the input calculation conditions in the design phase: refer to the attached Figure 1 As shown, according to the theoretical position of the door hinge axis, the door side panel, CAS or the position of the external opening handle, the theoretical ballast of the door sealing strip, the door opening sealing strip and the lower sealing strip section are determined respectively as the input calculation conditions in the design stage;

[0031] Define the center of mass position of the door strip: refer to the attached Figure 5 As shown, according to the different forces or positions of the door sealing strip, the door opening sealing strip and the lower sealing strip, they are divided into different force areas, a force point is selected in each force area, and this force point is regarded as the centroid position of this section of the sealing strip, and each position is defined respectively. The centroid of the door strip is defined as 9 positions, namely P1, P2, P3, P4, P5, P6, P7, P8, and P9;

[0032] Calculation of the center force of the door seal: refer to the attached Figure 4 As shown in the figure, according to the actual position of the door hinge, the hinge axis position is determined, and according to the unit load of different sections analyzed by CAE, as shown in the attached figure. Figure 2 , 3 As shown, calculate the force at each center of mass position, assuming that the force Pi is Fi, then Fi = L i长 *F s Where: L i长 is the length of the sealing strip at point Pi, F s Ballast for sealing strip per unit length;

[0033] Simple calculation of door sealing force: Based on the principle of moment balance, as shown in the attached Figure 6 As shown,

[0034]

[0035] F is the theoretical door closing force required for the handle position, i.e., the door sealing force; Li is the distance from the set center of mass to the door hinge axis; and L is the distance from the handle force application point to the door hinge axis;

[0036]

[0037] By comparing the actual measured values ​​with the calculated values, as shown in Table 1, the theoretical closing force F required for the handle position is determined, and the calculated result is relatively accurate.

[0038] Table 1: Comparison of actual measured values ​​and calculated values

[0039] Design value Measurements deviation Door seals 89.54613664 109 25％ Door opening strip 84.11657108 95 12.5％ total 173.6627077 20 17％

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A simplified calculation method for door sealing force, characterized in that: It includes the following steps: 1) Determine the input calculation conditions in the design phase: According to the theoretical position of the door hinge axis, the door side panel, CAS or the position of the external opening handle, the theoretical ballast of the door sealing strip, door opening sealing strip and lower sealing strip section is determined respectively as the input calculation conditions in the design stage; 2) Define the center of mass of the door strip: According to the different forces or positions of the door sealing strip, the door opening sealing strip and the lower sealing strip, they are divided into different force-bearing areas, a force-bearing point is selected in each force-bearing area, and the force-bearing point is regarded as the centroid position of this section of the door strip, and the centroid positions of the door strips at various positions are defined in the different force-bearing areas; 3) Calculation of the force at the center of mass of the door strip: According to the actual position of the door hinge, determine the position of the hinge axis. According to the unit ballast of different sections analyzed by CAE, calculate the force at the center of mass of the door strip at each position confirmed in step 2). Assume that the force Pi is Fi. Fi=L i长 ×F s Where: L i长 is the length of the door strip at point Pi, F s is the ballast load per unit length of door strip section; 4) Simple calculation of door sealing force: According to the torque balance principle, F is the theoretical door closing force required for the handle position, that is, the door sealing force, Li is the distance from the set center of mass to the door hinge axis, and L is the distance from the handle force application point to the door hinge axis.

2. A simplified calculation method for door sealing force according to claim 1, characterized in that In the step 2), the centroid positions of the door strips are defined as 9 positions, namely P1, P2, P3, P4, P5, P6, P7, P8, and P9.

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