Assembly positioning tool and positioning method based on nacelle four-bar linkage

Abstract

The application discloses a kind of based on hood four-bar linkage hinge assembly positioning tool and its positioning method.The based on hood four-bar linkage hinge assembly positioning tool includes two positioning supports for being installed in the two sides of hood four-bar linkage hinge, positioning support includes positioning frame, fuselage positioning component and hinge positioning component, hinge positioning component includes main positioning pin, auxiliary positioning pin, for positioning hinge movable page Z direction top end face top end limiting baffle and for positioning hinge fixed page Z direction bottom end face bottom end limiting baffle, top end limiting baffle is attached with the Z direction positioning surface of hinge movable page, bottom end limiting baffle is attached with the Z direction positioning surface of hinge fixed page.The based on hood four-bar linkage hinge assembly positioning tool presented by the application, the Y direction and Z direction positioning of hood hinge are determined by overall positioning on vehicle body, can prevent the swing of hood and solve the size problem of matching of hood and surrounding exterior trim part.

Description

Technical Field

[0001] This invention relates to the field of automotive engineering technology, and in particular to an assembly positioning fixture and positioning method based on a four-bar linkage for the engine hood. Background Technology

[0002] With the rapid development of the automotive industry and the rapid improvement of automobile manufacturing standards, the appearance quality of automobiles is receiving increasing attention. The appearance quality of the front face of the car is an important aspect of this, and the front hood hinge is a crucial factor affecting the appearance quality of this area.

[0003] The car hood is connected to the vehicle body via hood hinges mounted on both sides. These hinges act as the hood's rotation axis when it opens and closes relative to the body, and their position affects the clearance and surface differences between the hood and the fenders, front bumper, and headlights. Currently, the hood hinges are typically self-positioned on the body before being secured with fasteners. This method of positioning the hood hinges cannot guarantee accurate placement on the body. When the hood rotates after being connected to the two hinges, it can wobble, causing deviations in the clearance and surface differences between the hood and its matching parts when closed relative to the body. This affects overall production efficiency and first-pass yield, increasing rework labor costs. Summary of the Invention

[0004] The main objective of this invention is to provide an assembly positioning fixture and its positioning method based on a four-bar linkage of a machine cover, which aims to improve the positioning accuracy of the four-bar linkage of the machine cover.

[0005] To achieve the above objectives, the present invention provides an assembly positioning fixture based on a four-bar linkage of a hood, comprising two positioning brackets for mounting on both sides of the four-bar linkage of the hood. Each positioning bracket includes a positioning frame and a fuselage positioning assembly and a hinge positioning assembly mounted on the positioning frame. The hinge positioning assembly includes a main positioning pin for positioning the main positioning hole of the hinge movable page, a secondary positioning pin for positioning the secondary positioning hole of the hinge movable page, a top limiting baffle for positioning the top surface of the hinge movable page in the Z direction, and a bottom limiting baffle for positioning the bottom surface of the hinge fixed page in the Z direction. The top limiting baffle is fitted with the Z-direction positioning surface of the hinge movable page, and the bottom limiting baffle is fitted with the Z-direction positioning surface of the hinge fixed page.

[0006] Preferably, the fuselage positioning mechanism includes a main fuselage positioning pin and a secondary fuselage positioning pin, wherein the axis of the main fuselage positioning pin is aligned with the X-direction and the axis of the secondary fuselage positioning pin is aligned with the Z-direction.

[0007] Preferably, the fuselage positioning mechanism further includes a Z-direction limiting baffle for limiting its Z-direction movement relative to the fuselage and a Y-direction limiting baffle for limiting its Y-direction movement relative to the fuselage.

[0008] Preferably, the fuselage positioning mechanism further includes a Y-axis auxiliary clamping mechanism for fixing the positioning frame to the fuselage in the Y direction.

[0009] Preferably, the axes of the main locating pin and the secondary locating pin are aligned with the Z-direction.

[0010] Preferably, a magnet is installed on the top limiting baffle.

[0011] Preferably, at least two top limiting baffles are provided, with the two top limiting baffles located on both sides of the main positioning pin.

[0012] Preferably, the positioning frame includes a right-angled trapezoidal frame at the top and a right-angled triangular frame at the bottom.

[0013] Preferably, the assembly positioning fixture based on the four-bar hinge of the hood further includes a handle mounted on the positioning frame.

[0014] This invention further proposes a positioning method based on the above-mentioned assembly positioning fixture based on the four-bar hinge of the machine cover, comprising the following steps: The assembly positioning fixture is fixed to the machine body using the machine body positioning components; By inserting the main positioning hole and the secondary positioning hole of the hinge movable page of the four-link hinge into the main positioning pin and the secondary positioning pin of the assembly positioning fixture respectively, the hinge movable page is positioned by fitting the top limiting baffle with the Z-direction positioning surface of the hinge movable page. The hinge fixing plate is positioned by fitting the bottom limiting baffle with the Z-direction positioning surface of the hinge fixing plate of the four-link hinge, and the hinge fixing plate is fixedly connected to the body by fasteners passing through the positioning holes on the hinge fixing plate. After disassembling and assembling the positioning fixture, fasteners are used to fix the hinge movable page to the machine cover by passing through the main positioning hole and the secondary positioning hole on the hinge movable page.

[0015] The assembly positioning fixture based on the four-bar hinge of the hood proposed in this invention first positions the assembly positioning fixture on the vehicle body using a body positioning component. Then, the four-bar hinge of the hood is positioned on the positioning frame using a main positioning pin, a secondary positioning pin, a top limiting baffle, and a bottom limiting baffle. Finally, with manual assistance, a torque gun is used to fasten the hinge fixing page in the Y direction to the vehicle body using bolts. In this way, the assembly fixture determines the Y and Z direction positioning of the hood hinge by its overall positioning on the vehicle body, which can prevent the hood from swinging and solve the size problem of matching the hood with surrounding exterior parts. At the same time, this assembly positioning fixture has the advantages of simple structure, small size, low cost, high precision, faster operation cycle, low labor intensity, and good consistency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a structure based on a four-bar linkage in the hood; Figure 2 for Figure 1 The diagram shows the mechanical mathematical model of the four-bar linkage of the hood. Figure 3 This is a schematic diagram of the assembly and positioning fixture based on the four-bar hinge of the machine cover according to the present invention. Figure 4 This is a schematic diagram of the positioning bracket in the assembly positioning fixture based on the four-bar hinge of the machine cover of the present invention. Figure 5 A schematic diagram of the four-bar linkage of the hood from one perspective; Figure 6 This is a structural schematic diagram of the four-bar linkage of the hood from another perspective. Figure 7 This is a schematic diagram of the fuselage and hood structure used in conjunction with the assembly and positioning fixture based on the four-bar hinge of the hood in this invention.

[0017] In the diagram, 1-Fuselage main positioning pin, 2-Fuselage secondary positioning pin, 3-Z-direction limiting baffle, 4-Y-direction limiting baffle, 5-Y-direction auxiliary clamping mechanism, 6-Main positioning pin, 7-Secondary positioning pin, 8-First top limiting baffle, 9-Second top limiting baffle, 10-Bottom limiting baffle, 11-Hinge movable page main positioning hole, 12-Hinge movable page secondary positioning hole, 13-Hinge fixed page first Y-direction fastening hole, 14-Hinge fixed page second Y-direction fastening hole, 15-Side panel main positioning hole, 16-Y-direction auxiliary clamping mechanism positioning surface, 17-Body side panel Y-direction positioning surface, 18-Hinge fixed page mounting surface, 19-Front suspension upper fender Z-direction fastening bracket surface, 20-Front suspension secondary positioning hole.

[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] It should be noted that in the description of this invention, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] This invention proposes an assembly positioning fixture based on a four-bar linkage of the machine cover.

[0022] like Figure 1 , Figure 5 and Figure 6 As shown, the four-bar hinge of the hood includes a fixed hinge plate for connecting to the vehicle body and a movable hinge plate for connecting to the hood. Both the fixed and movable hinge plates have side fixing plates. The front and rear ends of the fixed hinge plate have mounting holes for fixing the hood hinge to the vehicle body (a first Y-direction fastening hole 13 and a second Y-direction fastening hole 14, respectively). The movable hinge plate has an upper flange perpendicular to the side fixing plate, and the flange has positioning and mounting holes for positioning the hood (a main positioning hole 11 and a secondary positioning hole 12, respectively). The four-bar hinge of the hood is fastened to the vehicle body in the Y direction through two round holes. When the Z-direction positioning surface of the four-bar hinge of the hood fluctuates, it will affect the gap and surface difference between the hood and the front bumper. The following mathematical model can be established through analysis.

[0023] like Figure 2 As shown: ab is the distance between the two fastening holes of the hinge fixing page (designed to be about 100mm), bc is the distance from the positioning hole of the hinge fixing page to the mating surface of the front cover and the front bumper (designed to be about 900mm), bb´ is the Z-axis undulation dimension of the hinge, and cc´ is the Z-axis undulation dimension of the mating surface of the front cover and the front bumper. According to Figure 2 From the mathematical trigonometric relationships, we can know that:

[0024] bb´:cc´=ab:ac (where ac=ab+bc). Based on the distance between the hinge fixing page positioning holes and the hood's outline dimensions, bb´:cc´≈1:10. That is, when bb´ deviates by 0.5mm, the matching position of the front cover and front bumper outline is affected by approximately 5mm. Therefore, ensuring the Z-axis positioning of the hinge fixing page positioning holes can improve the positional matching degree between the front cover and front bumper outline. Therefore, the key point of the assembly positioning fixture based on the hood's four-bar hinge proposed in this invention is to ensure the installation accuracy of the positioning holes in the Z-axis direction.

[0025] In this preferred embodiment, refer to Figures 3 to 7 An assembly positioning fixture based on a four-bar linkage of a hood includes two positioning brackets (one positioning bracket for mounting a four-bar linkage) for mounting on both sides of the four-bar linkage of the hood. Each positioning bracket includes a positioning frame, a fuselage positioning assembly, and a hinge positioning assembly mounted on the positioning frame. The hinge positioning assembly includes a main positioning pin 6 for positioning the main positioning hole 11 of the hinge movable page, a secondary positioning pin 7 for positioning the secondary positioning hole 12 of the hinge movable page, a top limiting baffle for positioning the top surface of the hinge movable page in the Z direction, and a bottom limiting baffle for positioning the bottom surface of the hinge fixed page in the Z direction. The top limiting baffle is fitted with the Z-direction positioning surface of the hinge movable page, and the bottom limiting baffle is fitted with the Z-direction positioning surface of the hinge fixed page.

[0026] Both the fuselage positioning assembly and the hinge positioning assembly are detachably connected to the positioning frame via fasteners, thereby facilitating the adjustment of the installation position of the fuselage positioning assembly and the hinge positioning assembly.

[0027] In this embodiment, the fuselage positioning mechanism includes a main fuselage positioning pin 1 and a secondary fuselage positioning pin 2. The axis of the main fuselage positioning pin 1 is aligned with the X-axis, and the axis of the secondary fuselage positioning pin 2 is aligned with the Z-axis. The fuselage and the four-bar linkage are both based on the same coordinate system, the direction of which is shown below. Figure 3 and Figure 4 As shown.

[0028] Furthermore, referring to Figure 4 The fuselage positioning mechanism also includes a Z-direction limiting baffle 3 for limiting its Z-direction movement relative to the fuselage and a Y-direction limiting baffle 4 for limiting its Y-direction movement relative to the fuselage. The Z-direction limiting baffle 3 and the Y-direction limiting baffle 4 have positioning surfaces for positioning the corresponding parts.

[0029] Furthermore, referring to Figure 4The fuselage positioning mechanism also includes a Y-axis auxiliary clamping mechanism 5 for fixing the positioning frame to the fuselage in the Y direction. Both positioning brackets are equipped with the Y-axis auxiliary clamping mechanism 5, thereby securely clamping the fuselage positioning mechanism to the fuselage in the Y direction. The Y-axis auxiliary clamping mechanism 5 can be a common clamping device in the prior art, as long as it can clamp the fuselage positioning mechanism; this invention does not limit its application.

[0030] Specifically, the axes of the main positioning pin 6 and the secondary positioning pin 7 are both flush with the Z-axis. Furthermore, a magnet is installed on the top limiting baffle, which can stably magnetically connect with the Z-axis top surface of the hinge's movable page to achieve a tight fit and ensure the Z-axis positioning accuracy of the four-bar hinge of the machine cover.

[0031] In this embodiment, at least two top limiting baffles are provided, and the two top limiting baffles are located on both sides of the main positioning pin 6. Figure 3 and Figure 4 Taking a device with two top limit baffles as an example, namely the first top limit baffle 8 and the second top limit baffle 9.

[0032] In this embodiment, the positioning frame includes a right-angled trapezoidal frame at the top and a right-angled triangular frame at the bottom. The positioning frame with this structure has the advantage of structural stability.

[0033] Furthermore, this assembly positioning fixture based on the four-bar linkage of the hood also includes a handle mounted on the positioning frame.

[0034] The assembly and positioning fixture based on the four-bar hinge of the hood operates as follows: First, the assembly positioning fixture is fixed to the vehicle body: the main positioning pin 1 of the body is fixed to the main positioning hole 15 of the side of the vehicle body, the secondary positioning pin 2 of the body is fixed to the secondary positioning hole 20 of the front suspension arm of the vehicle body, the Z-direction limiting baffle 3 of the fixture is fitted with the Z-direction fastening bracket surface 19 of the upper fender of the front suspension arm, the Y-direction limiting baffle 4 and the Y-direction auxiliary clamping mechanism 5 of the fixture are positioned on the side of the vehicle body, and the Y-direction limiting baffle 4 is fitted with the Y-direction positioning surface 17 of the side of the vehicle body. The main positioning hole 11 and the secondary positioning hole 12 on the hinge movable page are connected to the main positioning pin 6 and the secondary positioning pin 7 of the assembly positioning fixture, respectively. The Z-direction positioning of the hinge movable page is ensured by the strong magnet contained in the top limiting baffle. The Z-direction positioning surface of the hinge fixed page is fitted with the bottom limiting baffle of the overall fixture, thereby completing the positioning of the four-bar hinge of the machine cover (at this time, the four-bar hinge of the machine cover is in a tightened state, and its Z-direction positioning restricts the movement of the hinge movable page relative to the hinge fixed page). By passing bolts through the first Y-direction fastening hole 13 and the second Y-direction fastening hole 14 on the hinge fixing page, the engine cover hinge fixing page is fixed to the vehicle body by using a fixed torque wrench. Open the Y-axis auxiliary clamping mechanism 5 of the assembly positioning fixture, remove the assembly positioning fixture and place it on the fixture template; The hinge movable page is fixedly connected to the machine cover by fasteners passing through the main positioning hole 11 and the secondary positioning hole 12 on the hinge movable page.

[0035] The assembly positioning fixture based on the four-bar hinge of the hood proposed in this invention first positions the assembly positioning fixture on the vehicle body using the body positioning component. Then, the four-bar hinge of the hood is positioned on the positioning frame by the main positioning pin 6, the secondary positioning pin 7, the top limiting baffle, and the bottom limiting baffle. Finally, with manual assistance, a torque gun is used to fasten the hinge fixing page in the Y direction to the vehicle body with bolts. In this way, the assembly fixture determines the Y and Z direction positioning of the hood hinge by the overall positioning on the vehicle body, which can prevent the hood from swinging and solve the size problem of matching the hood with the surrounding exterior parts. At the same time, this assembly positioning fixture has the advantages of simple structure, small size, low cost, high precision, faster operation cycle, low labor intensity, and good consistency.

[0036] The present invention further proposes a positioning method for an assembly positioning fixture based on a four-bar linkage of the hood.

[0037] In this preferred embodiment, a positioning method based on the above-described assembly positioning fixture using a four-bar linkage for the machine hood includes the following steps: Step S10: Fix the assembly positioning fixture to the machine body using the machine body positioning assembly; Step S20: The hinge movable page is positioned by inserting the main positioning hole 11 and the secondary positioning hole of the hinge four-bar linkage into the main positioning pin 6 and the secondary positioning pin 7 of the assembly positioning fixture, respectively, and by setting the top limiting baffle to fit against the Z-direction positioning surface of the hinge movable page. Step S30: The hinge fixing plate is positioned by fitting the bottom limiting baffle with the Z-direction positioning surface of the hinge fixing plate of the four-link hinge, and the hinge fixing plate is fixedly connected to the body by fasteners passing through the positioning holes on the hinge fixing plate. Step S40: After disassembling and assembling the positioning fixture, the hinge movable page is fixedly connected to the machine cover by fasteners passing through the main positioning hole and the secondary positioning hole on the hinge movable page.

[0038] The positioning method proposed in this invention can achieve precise positioning of the hood hinge in the Y and Z directions, thereby effectively preventing the hood from swinging and solving the size problem of matching the hood with the surrounding exterior parts. At the same time, this positioning method is simple to operate and has high positioning accuracy.

[0039] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An assembly positioning fixture based on a four-bar linkage of a machine hood, characterized in that, This includes two positioning brackets for mounting on both sides of the four-bar linkage of the hood. Each positioning bracket includes a positioning frame, a fuselage positioning assembly, and a hinge positioning assembly mounted on the positioning frame. The hinge positioning assembly includes a main positioning pin for positioning the main positioning hole of the hinge movable page, a secondary positioning pin for positioning the secondary positioning hole of the hinge movable page, a top limiting baffle for positioning the top surface of the hinge movable page in the Z direction, and a bottom limiting baffle for positioning the bottom surface of the hinge fixed page in the Z direction. The top limiting baffle is fitted with the Z-direction positioning surface of the hinge movable page, and the bottom limiting baffle is fitted with the Z-direction positioning surface of the hinge fixed page. The body positioning assembly includes a main body positioning pin and a secondary body positioning pin. The axis of the main body positioning pin is flush with the X-direction, and the axis of the secondary body positioning pin is flush with the Z-direction. The body positioning assembly also includes a Z-direction limiting baffle for limiting its Z-direction movement relative to the body and a Y-direction limiting baffle for limiting its Y-direction movement relative to the body. A magnet is installed on the top limiting baffle. At least two top limiting baffles are provided, and the two top limiting baffles are located on both sides of the main positioning pin.

2. The assembly positioning fixture based on the four-bar hinge of the hood as described in claim 1, characterized in that, The fuselage positioning assembly also includes a Y-axis auxiliary clamping mechanism for fixing the positioning frame to the fuselage in the Y direction.

3. The assembly positioning fixture based on the four-bar hinge of the hood as described in claim 1, characterized in that, The axes of the main locating pin and the auxiliary locating pin are aligned with the Z-direction.

4. The assembly positioning fixture based on the four-bar hinge of the hood as described in claim 1, characterized in that, The positioning frame includes a right-angled trapezoidal frame at the top and a right-angled triangular frame at the bottom.

5. The assembly positioning fixture based on the four-bar hinge of the hood as described in any one of claims 1 to 4, characterized in that, It also includes handles mounted on the positioning frame.

6. A positioning method based on the assembly positioning fixture based on the four-bar linkage of the machine hood as described in any one of claims 1 to 5, characterized in that, Includes the following steps: The assembly positioning fixture is fixed to the machine body using the machine body positioning components; By inserting the main positioning hole and the secondary positioning hole of the hinge movable page of the four-link hinge into the main positioning pin and the secondary positioning pin of the assembly positioning fixture respectively, the hinge movable page is positioned by fitting the top limiting baffle with the Z-direction positioning surface of the hinge movable page. The hinge fixing plate is positioned by fitting the bottom limiting baffle with the Z-direction positioning surface of the hinge fixing plate of the four-link hinge, and the hinge fixing plate is fixedly connected to the body by fasteners passing through the positioning holes on the hinge fixing plate. After disassembling and assembling the positioning fixture, fasteners are used to fix the hinge movable page to the machine cover by passing through the main positioning hole and the secondary positioning hole on the hinge movable page.

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