Design method of car coat rack drawstring

Abstract

The present invention provides a method for designing a drawstring for an automotive coat rack. This method includes projecting the coat rack's mounting structure in the Y direction to determine the tailgate pivot position A and the coat rack pivot position B; determining the drawstring's mounting point position X on the tailgate window frame trim and the drawstring's mounting point Y when the tailgate is closed; analyzing the tailgate closed state to determine #imgabs0# and the tailgate open state to determine #imgabs1#, and then jointly determining the drawstring's length and the location of its connection point with the tailgate window frame trim. This method directly calculates the drawstring's length and its attachment point on the tailgate window frame trim, preventing the drawstring from being compressed by the tailgate's rubber strips during early design. It also ensures that the drawstring remains straight, improving aesthetics.

Description

Technical Field

[0001] The invention relates to the field of automobile manufacturing, and in particular to a design method for a drawstring of an automobile coat rack. Background Art

[0002] Existing automobile coat racks are mostly designed using a three-point design method, that is, when the tailgate and coat rack reach their maximum opening at the same time, two points are selected on the coat rack and the tailgate trim respectively, and then the pull cord is checked to see whether it is compressed by the tailgate rubber strip after the tailgate is closed. In addition, in order to prevent the pull cord from being compressed by the rubber strip, some will make a hole at the fixing point of the coat rack end, and add a weight to the pull cord end. When the tailgate is closed, the pull cord will be pulled downward by the weight to prevent the pull cord from being compressed by the rubber strip due to contraction.

[0003] These design methods all have the following defects: the clothes rack buffer block interferes with the tailgate interior panel and produces powder; the clothes rack panel shakes greatly when the prototype vehicle passes the bad road test; the hanging rope at the tailgate end of the clothes rack panel is easy to fall off; the clothes rack panel shaft is loose; the tailgate rubber strip clamps the clothes rack pull rope and causes water leakage; the clothes rack interferes with the movement of the rear side panel and has wear marks, etc. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for designing a drawstring for a car coat rack. The method directly calculates the length of the drawstring and the fixing point of the drawstring on the tailgate window frame trim. This method can directly avoid the possibility of the drawstring being pressed by the tailgate rubber strip in the early design, and can also keep the drawstring in a straightened state at all times, thereby improving the aesthetics.

[0005] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0006] According to one aspect of the present invention, a method for designing a drawstring for a car coat rack is provided. The method comprises: performing a Y-projection on the mounting structure of the car coat rack to obtain the position A of the tailgate pivot and the position B of the coat rack pivot; determining the position X of the drawstring installation point on the tailgate window frame trim and the position Y of the drawstring installation point on the coat rack when the tailgate is closed; and analyzing the tailgate closed state: deriving the following equation based on the sine and cosine theorems: where l AY is the distance between A and Y, l is the distance between A and X, l0 is the length of the pull cord XY, and γ is the angle value of ∠XAY; analyze the tailgate opening state: when the tailgate window frame trim is opened by the pull cord, point X moves to point X1, and point Y moves to point Y1. According to the sine theorem and cosine theorem, where l AY1is the distance between A and Y1, l is the distance between A and X1, l0 is the length of the rope XY, and γ1 is the angle value of ∠X1AY1; combine (1) and (2) to solve for l and l0.

[0007] According to an embodiment of the present invention, in the analysis of the tailgate closing state, l AY1 The calculation method is: measure the distance l1 between A and B, measure the distance l2 between B and Y, and measure the angle β between the coat rack and the line AB when the tailgate is closed; according to the cosine theorem Find the distance l between A and Y AY .

[0008] According to an embodiment of the present invention, in the analysis of the tailgate closing state, the angle value γ of ∠XAY is calculated as follows: the distance l between A and X is measured, and the angle value of ∠BAY is recorded as δ; the obtained l is AY Substitute into the law of sine Determine the angle δ of ∠BAY. Measure the angle α between the tailgate window frame trim and line AB when the tailgate is closed. Substitute the angle δ of ∠BAY into γ + δ = α to determine the angle γ of ∠XAY.

[0009] According to an embodiment of the present invention, in the analysis of the tailgate opening state, l AY1 The calculation method is as follows: set the maximum opening angle value θ1 of the tailgate window frame trim and the opening angle value θ2 of the coat rack; measure the distance l1 between A and B, measure the distance l2 between B and Y1, and measure the angle β between the coat rack and the line AB when closed; according to the cosine theorem Find the distance l between A and Y1 AY1 .

[0010] According to an embodiment of the present invention, in the analysis of the tailgate opening state, the angle value γ1 of ∠X1AY1 is calculated as follows: the distance l between A and X1 is measured, and the angle value of ∠BAY1 is recorded as δ1; the obtained l is AY1 Substitute into the law of sine Obtain the angle value δ1 of ∠BAY1; measure the angle α between the tailgate window frame trim and the line AB when the tailgate is closed; substitute the angle value δ1 of ∠BAY1 into γ1+δ1=α+θ2 to obtain the angle value γ1 of ∠X1AY1.

[0011] According to an embodiment of the present invention, the position Y where the installation point of the drawstring is located on the coat rack is set at a corner area of the coat rack away from one end of the coat rack rotation axis.

[0012] An embodiment of the present invention has the following advantages or beneficial effects:

[0013] The present invention's automotive coat rack drawstring design method sets the connection point between the drawstring and the coat rack at an angle away from one end of the coat rack's rotating shaft, meeting the respective opening requirements of the tailgate window frame trim and the coat rack. The drawstring length is directly calculated, and the drawstring's fixed point on the tailgate window frame trim is designed. This allows the drawstring to be stretched straight to open and close the tailgate when unloaded, resolving the problem of water leakage caused by excessive drawstring length being compressed by the tailgate beading. The possibility of the drawstring being compressed by the tailgate rubber strip can be directly avoided in the early design phase, and the drawstring can be kept straight at all times, improving its aesthetics. This provides a comprehensive design approach for drawstring design, filling the gap in current theoretical design methods, shortening the design cycle, quickly identifying key design points, and reducing unnecessary trial-and-error adjustment time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings.

[0015] Figure 1 It is a schematic diagram of the Y-axis projection of a method for designing a drawstring for a car coat rack according to an exemplary embodiment.

[0016] Figure 2 1 is a schematic diagram showing the superposition of open and closed states of a tailgate according to a method for designing a drawstring for a car coat rack according to an exemplary embodiment.

[0017] Figure 3 The figure is a schematic diagram showing a tailgate closed state according to a method for designing a drawstring for a car coat rack according to an exemplary embodiment.

[0018] Figure 4 The figure is a schematic diagram showing a tailgate open state according to a method for designing a drawstring for a car coat rack according to an exemplary embodiment.

[0019] Figure 5 The figure is a perspective view of a tailgate in an open state showing a method for designing a drawstring for a car coat rack according to an exemplary embodiment.

[0020] Figure 6 The figure is a perspective view of a tailgate closed state showing a method for designing a drawstring for a car coat rack according to an exemplary embodiment.

[0021] The description of the accompanying drawings is as follows:

[0022] 1. Tailgate hinge; 2. Coat rack; 3. Coat rack hinge; 4. Pull cord; 5. Tailgate window frame trim. DETAILED DESCRIPTION

[0023] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0024] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0025] like Figures 1 to 4 As shown, Figure 1 A schematic diagram of the Y-direction projection of a method for designing a drawstring for a car coat rack provided by the present invention is shown. Figure 2 A schematic diagram showing the superposition of the open and closed states of the tailgate in a method for designing a drawstring for a car coat rack provided by the present invention is shown. Figure 3 A schematic diagram showing a tailgate open state of a method for designing a drawstring for a car coat rack provided by the present invention is shown. Figure 4 A schematic diagram showing a tailgate open state of a method for designing a drawstring for a car coat rack provided by the present invention is shown.

[0026] Figure 5 A three-dimensional diagram showing a tailgate open state of a method for designing a drawstring for a car coat rack provided by the present invention. Figure 6 A three-dimensional diagram showing a tailgate closed state according to a method for designing a drawstring for a car coat rack provided by the present invention.

[0027] The method for designing a car coat rack drawstring according to an embodiment of the present invention includes projecting the mounting structure of the car coat rack 2 in the Y direction to obtain the position A of the tailgate pivot 1 and the position B of the coat rack pivot 3; in the tailgate closed state, the position X of the mounting point of the drawstring 4 on the tailgate window frame trim 5 and the position Y of the mounting point of the drawstring 4 on the coat rack 2; analyzing the tailgate closed state: according to the sine theorem and the cosine theorem, it is obtained where l AY is the distance between A and Y, l is the distance between A and X, l0 is the length of the pull cord 4, and γ is the angle value of ∠XAY; analyze the tailgate opening state: when the tailgate window frame trim 5 drives the coat rack 2 to open through the pull cord 4, point X moves to point X1, and point Y moves to point Y1. According to the sine theorem and cosine theorem, in is the distance between A and Y1, l is the distance between A and X1, l0 is the length of the rope 4, and γ1 is the angle value of ∠X1AY1; combine (1) and (2) to solve l and l0.

[0028] Among them, after comparing and analyzing the coat rack 2 and the four-bar linkage, the overall motion state conforms to the four-bar linkage motion mechanism. Therefore, we abstract and simplify the mechanism of the coat rack 2 and project the installation structure of the coat rack 2 in the Y direction, that is, project it in the left and right directions of the car to obtain a schematic diagram of the four-bar linkage mechanism. Since the connection position of the pull rope 4 and the coat rack 2 has been determined, it is only necessary to determine the length of the pull rope 4 and the connection position of the pull rope 4 and the tailgate window frame trim 5. By analyzing the state when the tailgate is closed, the tailgate shaft 1 is at position A, the coat rack shaft 3 is at position B, the connection point of the pull rope 4 and the tailgate window frame trim 5 is at X, and the connection point of the pull rope 4 and the coat rack 2 is at Y. Connect AB, BY, YX and XA respectively, where XY is the length of the pull rope 4. Connect AY. In △AXY, the sine theorem and cosine theorem are used to obtain equation (1): Let's analyze the state of the tailgate when it is open. When the tailgate is closed and fully opened, the position A of the tailgate shaft 1 and the position B of the coat rack shaft 3 remain unchanged. The connection point between the pull rope 4 and the tailgate window frame trim 5 changes from X to X1, and the connection point between the pull rope 4 and the coat rack 2 changes from Y to Y1. Connect AB, BY1, Y1X1 and X1A respectively, where X1Y1 is the length l0 of the pull rope 4. Connect AY1. In △AX1Y1, the sine theorem and cosine theorem give equation (2): Combining equations (1) and (2), we only need to get l AY 、 , γ and γ1 to obtain the values of l and l0.

[0029] In a preferred embodiment of the present invention, in the analysis of the tailgate closing state, l AY The calculation method is as follows: measure the distance l1 between A and B, measure the distance l2 between B and Y, and measure the angle β between the coat rack 2 and the line AB when the tailgate is closed; according to the cosine theorem Find the distance l between A and Y AY .

[0030] like Figures 1 to 3 、 Figure 6As shown, when the tailgate is closed, the tailgate pivot 1 is at position A, the coat rack pivot 3 is at position B, the connection point between the pull cord 4 and the tailgate window frame trim 5 is at position X, and the connection point between the pull cord 4 and the coat rack 2 is at position Y. Connect AB, BY, YX, and XA respectively, where XY is the length l0 of the pull cord 4. Connect AY, where the distance between AB is l1 and the distance between BY is l2. In △ABY, when the tailgate is closed, the angle between the coat rack 2 and the line AB is ∠ABY = β. According to the cosine theorem, Since l1 and l2 are necessary conditions to be achieved in the design, that is, they are known numbers, after measuring the distance between AB and BY, we can get l by inserting them into the above cosine theorem formula. AY .

[0031] In a preferred embodiment of the present invention, in the analysis of the tailgate closing state, the angle value γ of ∠XAY is calculated as follows: the distance l between A and X is measured, and the angle value of ∠BAY is recorded as δ; the obtained l is AY Substitute into the law of sine Obtain the angle δ of ∠BAY; measure the angle α between the tailgate window frame trim 5 and the line AB when the tailgate is closed; substitute the angle δ of ∠BAY into γ+δ=α to obtain the angle γ of ∠XAY.

[0032] like Figures 1 to 3 、 Figure 6 As shown, in △ABY, the distance of BY is known to be l2, and according to the sine theorem The angle between the coat rack 2 and the line AB when closed, that is, ∠ABY=β, is also known. The obtained l AY Substituting the sine theorem, the angle value δ of ∠BAY can be obtained. Since ∠BAY+∠XAY=∠BAX, that is, γ+δ=α, where ∠BAX=α is the known maximum opening of the tailgate window frame trim 5, the angle value γ of ∠XAY can be obtained.

[0033] In a preferred embodiment of the present invention, in the analysis of the tailgate opening state, The calculation method is as follows: set the maximum opening angle value θ1 of the tailgate window frame trim 5 and the opening angle value θ2 of the coat rack 2; measure the distance l1 between A and B, measure the distance l2 between B and Y1, and measure the angle β between the coat rack 2 and the line AB when closed; according to the cosine theorem Find the distance between A and Y1 .

[0034] like Figure 1 and Figure 2 、 Figure 4 、 Figure 5As shown, after the tailgate is opened, the position A of the tailgate shaft 1 and the position B of the coat rack shaft 3 remain unchanged. The connection point of the pull rope 4 and the tailgate window frame trim 5 is at X1, and the connection point of the pull rope 4 and the coat rack 2 is at Y1. Connect AB, BY1, Y1X1 and X1A respectively, where X1Y1 is the length l0 of the pull rope 4, BY=BY1=l2, XY=X1Y1=l0, AX=AX1=l, connect AY1, where the distance AB is l1, the distance BY is l2, l1 and l2 remain unchanged, which is the necessary condition to be achieved in the design, that is, the known number, θ2 is the required opening of the coat rack 2 in the design condition, in △ABY1, according to the cosine theorem Measure the distance between AB and BY1 and then enter it into the above cosine theorem formula to get .

[0035] In a preferred embodiment of the present invention, in the analysis of the tailgate opening state, the angle value γ1 of ∠X1AY1 is calculated as follows: the distance l between A and X1 is measured, and the angle value of ∠BAY1 is recorded as δ1; Substitute into the law of sine Obtain the angle value δ1 of ∠BAY1; measure the angle α between the tailgate window frame trim 5 and the line AB when the tailgate is closed; substitute the angle value δ1 of ∠BAY1 into γ1+δ1=α+θ2 to obtain the angle value γ1 of ∠X1AY1.

[0036] like Figure 1 and Figure 2 、 Figure 4 、 Figure 5 As shown, in △ABY1, the distance of BY1 is known to be l2, and according to the sine theorem The angle between the coat rack 2 and the line AB when the tailgate is open is also known, that is, ∠ABY1=β-θ2, and the obtained Substituting the sine theorem, the angle value δ1 of ∠BAY1 can be obtained. Since ∠XAY1∠BAY1=∠BAX1, that is, γ1+δ1=α+θ2, where ∠BAX1=α+θ2 is the known maximum angle between the tailgate window frame trim panel 5 and AB after opening, the angle value γ1 of ∠XAY can be obtained.

[0037] In a preferred embodiment of the present invention, the installation point Y of the drawstring 4 on the coat rack 2 is set at a corner area of the coat rack 2 away from the coat rack rotation axis 3.

[0038] like Figures 1 to 6As shown, when the tailgate is open, the drawstring 4 pulls up the coat rack 2 trim. According to the abuse test requirement 4.10.2 of the general global test standard GMW14580-2007 "Load Compartment Cover," a 5kg weight must be placed at the center of the rear edge of the coat rack 2 trim. When the tailgate is closed, no significant damage should be observed to the relevant components. Mechanical theory indicates that the closer the lower end of the drawstring 4 is to the rear of the coat rack 2, the less tension it will experience, and the better the mechanical properties. To balance aesthetics and spatial convenience, the drawstring 4 is mounted on the coat rack 2 at a corner area on the coat rack 2 away from position B where the coat rack's rotating shaft 3 is located.

[0039] Actual vehicle verification shows that the distance l1 = 462 mm between the coat rack shaft 3 and the tailgate shaft 1, the length l2 = 247 mm from the coat rack shaft 3 to the connection point Y of the pull rope 4 and the coat rack 2, the angle α = 18° between the tailgate window frame trim 5 and the AB line when in the closed state, the angle β = 140° between the coat rack 2 and the AB line when in the closed state, the maximum opening θ1 = 66° of the tailgate window frame trim 5, and the rotation angle θ2 = 60° of the coat rack 2; the design method of the present invention can be used to directly calculate the length l0 = 391 mm of the pull rope 4 and the distance l = 280 mm from the connection point of the pull rope 4 and the tailgate window frame trim 5 to the tailgate shaft 1.

[0040] The present invention's automobile coat rack drawstring design method sets the connection point between the drawstring 4 and the coat rack 2 at an angle away from one end of the coat rack's rotating shaft 3, meeting the respective opening requirements of the tailgate window frame trim 5 and the coat rack 2. The drawstring 4's length is directly calculated, and the drawstring 4's fixing point on the tailgate window frame trim 5 is designed. This allows the drawstring 4 to be stretched out to open and close the tailgate when unloaded, resolving the problem of water leakage caused by the drawstring 4 being compressed by the tailgate beading due to its excessive length. The possibility of the drawstring 4 being compressed by the tailgate beading can be directly avoided in the early design phase, and the drawstring 4 can be kept straight at all times, improving the aesthetics. This provides a complete design approach for the drawstring 4, filling the gap currently lacking a theoretical design method, shortening the design cycle, quickly identifying key design points, and reducing unnecessary trial-and-error adjustment time.

[0041] In the embodiments of the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art will understand the specific meanings of these terms in the embodiments of the present invention based on specific circumstances.

[0042] In the description of the embodiments of the present invention, it should be understood that the terms "upper" and "lower" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0043] Throughout this specification, terms such as "one embodiment" and "a preferred embodiment" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0044] The above is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible in the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for designing a drawstring for a car coat rack, characterized in that: include: Project the mounting structure of the automobile coat rack (2) in the Y direction to obtain the position A of the tailgate shaft (1) and the position B of the coat rack shaft (3); The drawstring (4) is designed to be fixed at a point X on the tailgate window frame panel (5), and the position Y where the drawstring (4) is installed on the coat rack (2) is set at an angle area of the coat rack (2) away from one end of the coat rack rotation axis (3), so as to meet the respective opening requirements of the tailgate window frame panel and the coat rack; In the tailgate closed state, the installation point of the pull cord (4) on the tailgate window frame trim (5) is at position X, and the installation point of the pull cord (4) on the coat rack (2) is at position Y; Analyze the tailgate closing state: According to the sine theorem and cosine theorem, where l AY is the distance between A and Y, l is the distance between A and X, l0 is the length of the rope (4)XY, and γ is the angle value of ∠XAY; Analysis of the tailgate opening state: When the tailgate window frame panel (5) drives the coat rack (2) to open through the pull rope (4), point X moves to point X1, and point Y moves to point Y1. According to the sine theorem and the cosine theorem, where l AY1 is the distance between A and Y1, l is the distance between A and X1, l0 is the length of the rope (4)XY, and γ1 is the angle value of ∠X1AY1; Combining (1) and (2), we can obtain l and l0.

2. The method for designing a drawstring for a car coat rack according to claim 1, characterized in that: In the analysis of the tailgate closing state, AY The calculation method is: Measure the distance l1 between A and B, measure the distance l2 between B and Y, and measure the angle β between the coat rack (2) and the line AB when the tailgate is closed; According to the law of cosines Find the distance l between A and Y AY .

3. The method for designing a drawstring for a car coat rack according to claim 2, characterized in that: In the analysis of the tailgate closing state, the angle value γ of ∠XAY is calculated as follows: Measure the distance l between A and X, and record the angle value of ∠BAY as δ; The obtained l AY Substitute into the law of sine Calculate the angle δ of ∠BAY; Measure the included angle α between the tailgate window frame trim (5) and the line AB when the tailgate is closed; Substitute the angle value δ of ∠BAY into γ+δ=α to obtain the angle value γ of ∠XAY.

4. The method for designing a drawstring for a car coat rack according to claim 1, characterized in that: In the analysis of the tailgate opening state, AY1 The calculation method is: Setting the maximum opening angle value θ1 of the tailgate window frame trim (5) and the opening angle value θ2 of the coat rack (2); Measure the distance l1 between A and B, measure the distance l2 between B and Y1, and measure the angle β between the coat rack (2) and the line AB when in the closed state; According to the law of cosines Find the distance l between A and Y1 AY1 .

5. The method for designing a drawstring for a car coat rack according to claim 4, characterized in that: In the analysis of the tailgate opening state, the angle value γ1 of ∠X1AY1 is calculated as follows: Measure the distance l between A and X1, and record the angle value of ∠BAY1 as δ1; The obtained l AY1 Substitute into the law of sine Obtain the angle value δ1 of ∠BAY1; Measure the included angle α between the tailgate window frame trim (5) and the line AB when the tailgate is closed; Substitute the angle value δ1 of ∠BAY1 into γ1+δ1=α+θ2 to obtain the angle value γ1 of ∠X1AY1.

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