Automobile back door handle, automobile back door and automobile

Abstract

The utility model belongs to the technical field of automobile parts, and discloses an automobile back door handle, an automobile back door and an automobile. The automobile back door handle comprises a holding part and connecting parts connected to the two ends of the holding part, the holding part and the connecting parts are of hollow structures communicated with each other, grooves are formed in transition faces where the holding part and the two connecting parts are connected, the grooves are formed by sinking the inner side of the handle towards the hollow structures, the groove close to one connecting part is an air inlet groove, and the groove close to the other connecting part is an air outlet groove. And the other groove is an exhaust groove. The automobile back door handle solves the problem that an automobile back door handle in the prior art has air marks.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts, specifically relating to a car tailgate handle, a car tailgate, and a car. Background Technology

[0002] The structure of a car tailgate handle is typically wide and flat at both ends, and narrow and round in the middle. The wide and flat ends are used to connect to the tailgate and serve as the connecting part, while the narrow and round part in the middle is used by passengers to grip and exert force when opening and closing the door and serves as the gripping part. For reasons such as vehicle weight reduction, car tailgate handles are usually hollow, meaning that both the gripping part and the connecting part are hollow, and the hollow parts of the two are interconnected.

[0003] The injection molding of car tailgate handles usually uses gas-assisted injection molding (referred to as "gas-assisted"), which is a plastic molding technology that forms hollow plastic products by injecting high-pressure inert gas into the molten plastic, thereby reducing material usage, shortening cooling time, and reducing internal stress and warpage of the molded parts.

[0004] When using gas-assisted molding of car tailgate handles, gas is typically injected through an air needle from the end of the mold cavity, specifically the handle connection area. The injected gas is at a relatively high pressure. As the gas flows across the transition surface between the connection area and the grip area, changes in spatial structure and volume cause fluctuations in the high-pressure gas flow, creating turbulence that impacts different parts of the product. After being subjected to varying degrees of turbulent gas flow, air marks eventually form on the surface of the molded handle.

[0005] Products with air bubbles on their surface cannot be delivered to downstream manufacturers. To solve this problem, upstream manufacturers spray paint the product surface to cover the air bubbles and allow delivery. However, this product did not originally need to be painted, and spraying paint increases additional costs, which are incurred for almost every product, undoubtedly placing a significant burden on upstream companies. Utility Model Content

[0006] The present invention aims to provide a car tailgate handle, a car tailgate, and a car, in order to improve the problem of air marks on the existing car tailgate handles.

[0007] To achieve the above objectives, the present invention provides the following technical solution, including a grip portion and connecting portions connected to both ends of the grip portion. The grip portion and the connecting portions are hollow structures that are interconnected. Grooves are provided at the transition surfaces where the grip portion and the two connecting portions are connected. The grooves are formed by the indentation of the handle into the hollow structure from the inside. The groove near one of the connecting portions is an air intake groove, and the other groove is an exhaust groove.

[0008] Furthermore, the bottom of the air intake recess is arc-shaped.

[0009] Furthermore, the bottom of the exhaust groove is a slope, which is inclined towards the inside of the handle along the direction from the grip to the connection.

[0010] Furthermore, both sides of the intake and exhaust grooves are outwardly convex arc surfaces.

[0011] Furthermore, the vertical distance between the inner side of the bottom of the air intake groove and the outer side of the handle is A1, and the vertical distance between the inner side of the handle and the outer side of the handle at the air intake groove is A2. A1 / A2 = 1 / 22-4 / 22.

[0012] Furthermore, the vertical distance between the inner side of the bottom of the exhaust groove and the outer side of the handle is B1, and the vertical distance between the inner side of the handle and the outer side of the handle at the exhaust groove is B2, B1 / B2 = 3 / 22-5 / 22.

[0013] Furthermore, the inner width of both the air intake groove and the exhaust groove is 4 / 26 to 7 / 26 of the handle width.

[0014] Furthermore, the outer side of both the air intake groove and the outer side of the exhaust groove are curvedly transitioned to the bottom surface of the hollow structure of the grip.

[0015] This application also provides a car tailgate including the aforementioned tailgate handle, and a car including the car tailgate.

[0016] The principles and beneficial effects of this application are as follows:

[0017] The applicant has consistently encountered air bubbles on the surface of their car tailgate handles. To meet delivery deadlines, they have had to paint over the surface and cover the air bubbles later, which increases costs. To reduce costs and increase efficiency, the inventors have been trying to solve this problem.

[0018] To optimize product quality, the usual approach for gas-assisted molding is to adjust the parameters of the gas-assisted process, such as the gas injection pressure, gas injection speed, and gas injection time. However, after making related attempts, the inventors were unable to solve the problem of gas marks.

[0019] The inventor analyzed the cause of air marks on the product and concluded that it was due to excessive gas impact during the molding process, as well as changes in the structure and size of the product's grip and connecting parts. Since the product's appearance has standards and cannot be changed arbitrarily, the inventor could only work on the air intake method.

[0020] Following the above line of thought, the inventors made several attempts, such as: ① First, they increased the size of the air inlet to reduce the impact force of the gas under the same air intake volume, but the final molding results were unsatisfactory, and air marks could not be eliminated. ② The inventors then added more air inlets to disperse the impact force of air entering from a single air inlet under the same air intake volume, but the molding results were still unsatisfactory. ③ They changed the direction of the air inlet, allowing the glue to enter from the surface, thus directing the air intake towards the inner side of the product, intending that even if an impact occurred, it would impact the inner side of the product and not form air marks on the outer surface, but the molding results were still unsatisfactory. ④ They moved the position of the air inlet further away, hoping to attenuate the impact force of the gas, but the molding results were still unsatisfactory.

[0021] In addition to the above, the inventors tried various combinations of methods along the same line of thought, but none of them could solve the air mark problem. Later, the inventors realized that since the product's appearance could not be changed, only the A-side of the handle, the side facing the passenger, could not be changed; changing the inner side of the handle, the side connecting the handle to the back door, would not have an impact. Therefore, following this line of thought, and combining it with the flow of gas after entering the mold, the inventors finally came up with the idea of ​​adding a panel at the transition surface on the inner side of the mold near the handle, thus forming a groove on the inner side of the product. This could improve the problem, and by restricting the shape, structure, and dimensional proportions of the groove, the air marks could be made to almost completely disappear, without affecting the product's appearance, strength, etc.

[0022] The inventors analyzed the cause and concluded that in the original design, the strong-impact gas entering the mold would change its flow direction and create turbulence as it passed through the transition surface due to the altered shape and size of the space. This turbulence impacted various surfaces and parts of the pre-molded product, and the magnitude of the impact force was uncontrollable, ultimately leading to air marks after molding. However, by adding a panel at the corresponding position of the transition surface in the mold, and controlling the gas entry point to align with the bottom of the panel, the larger impact force of the gas entering the mold would directly hit the panel, thus buffering the impact. As more gas entered, the initial gas would flow along the panel towards the outer side of the handle, eventually smoothly crossing the panel and entering the grip space. The grip space is now smoother, allowing the gas to flow smoothly along the length of the grip, thereby improving the air mark problem. It is worth noting that the inventors also considered that reducing the impact force here cannot be achieved by reducing the gas injection pressure, because reducing the injection pressure makes it difficult to guarantee the formation of the entire hollow structure of the product. Moreover, while maintaining the same injection rate and injection efficiency, even if the entire product forms a hollow structure, it may collapse. Therefore, the problem can only be solved from a single point, that is, by reducing the instantaneous impact force at a single point.

[0023] During their research, the inventors discovered that adding a groove at the air inlet end already improved the issue of air marks on the handle surface. However, to maintain the overall symmetry of the handle, they considered adding a groove at the exhaust end as well. Further experiments revealed that the groove at the exhaust end, along with adjustments to its size and proportions, could also solve the problem of collapse at the exhaust end. The inventors speculated that during the handle molding process, the gas pressure at the exhaust end weakens due to air leakage, causing the outer surface of the connection at the exhaust end to collapse. Existing technologies address this collapse by increasing the gas pressure holding time, which undoubtedly reduces efficiency and increases time costs. However, by adding a groove at this location—that is, by installing a plate at the corresponding part of the mold—the flow space for the leaking gas is reduced, thereby increasing the gas pressure at this point. This provides stronger support to the outer surface of the connection at the exhaust end, preventing collapse and thus avoiding the need for increased pressure holding time, saving time costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the front structure of the car tailgate handle of this utility model.

[0025] Figure 2 This is a schematic diagram of the reverse side structure of the car tailgate handle of this utility model.

[0026] Figure 3 This is a cross-sectional view of the car tailgate handle of this utility model.

[0027] Figure 4 This is a schematic diagram of the mold structure used to manufacture the automotive tailgate handle of this utility model. Detailed Implementation

[0028] The following detailed description provides further details on specific implementation methods.

[0029] It should be understood that in the description of the specific embodiments, the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and 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 present invention.

[0030] The reference numerals in the accompanying drawings include: exhaust panel 3, intake panel 5, air passage 7, air needle 8, connecting part 9, grip part 10, exhaust groove 11, and intake groove 12.

[0031] This utility model provides a car tailgate handle, such as Figures 1-3The device includes a gripping part 10 and connecting parts 9 integrally formed with both ends of the gripping part 10. The gripping part 10 and the connecting parts 9 at both ends are hollow structures, and the hollow structures of the three are interconnected and formed with gas assistance.

[0032] Grooves are provided at the transition surfaces where the grip portion 10 and the two connecting portions 9 connect. These grooves are formed by the indentation of the inner side of the handle into the hollow structure. The inner side of the groove refers to the side that connects to the tailgate of the car. With this design, the inner side of the handle appears to have a notch at the groove. The groove near one of the connecting portions 9 is an air intake groove, i.e., the right groove in the attached drawing; the other groove is an exhaust groove 11, i.e., the left groove in the attached drawing.

[0033] The bottom of the air inlet groove 12 is arc-shaped, and the panel corresponding to the groove at the mold is also arc-shaped. The bottom of the groove corresponds to the upper part in the attached drawing. The direction of the arc is consistent with the gas flow direction, allowing the incoming gas to pass over the buffer panel and smoothly enter the space corresponding to the grip 10, avoiding air marks. Both sides of the air inlet groove 12 are outwardly convex arc surfaces, meaning they face away from the sides of the groove. One side of the air inlet groove 12 transitions smoothly with the bottom surface of the hollow structure of the grip 10, and this transition is located at the outwardly convex part of the air inlet groove 12. The bottom surface of the hollow structure at this point corresponds to the lower part in the attached drawing. Thus, after the gas enters the space corresponding to the grip 10, it can flow smoothly along the length of the grip 10, ensuring the strength of the handle at this location after molding.

[0034] The vertical distance between the inner bottom of the air intake groove 12 and the outer side of the handle is A1, and the vertical distance between the inner side of the handle and the outer side of the handle at the air intake groove is A2. A1 / A2 = 1 / 22-4 / 22, meaning any value within this range is acceptable, such as 2 / 22. In this embodiment, it is specifically 4 / 22. The inner bottom of the groove here corresponds to... Figure 3 The "center" refers to the top of the recessed cavity structure; the "inner side" of the handle refers to the side closest to the tailgate after the handle is assembled on the car's tailgate; the "outer side" refers to the side furthest from the tailgate after the handle is assembled; the vertical distance is the distance perpendicular to the bottom of the air intake recess. Through experimental verification by the inventors, this proportional limitation allows the air marks on the final handle surface to approach zero. The inner width of the air intake recess 12 is 4 / 26-7 / 26 of the handle width, specifically 5 / 26 in this embodiment. The inner width of the air intake recess here corresponds to the attached... Figure 3 In the middle, the dimension of the groove cavity structure perpendicular to the paper surface is; while the width of the handle is... Figure 3 The dimension perpendicular to the paper surface. This proportional constraint ensures that both ends of the groove are completely filled with solid plastic, without any air bubbles.

[0035] The bottom of the venting groove 11 is sloped, and this slope is inclined towards the inside of the handle along the direction from the grip portion 10 to the connecting portion 9. Therefore, the outer side of the bottom of the venting groove 11, i.e., the upper end face in the attached figure, is also sloped. This design allows gas to smoothly enter the space corresponding to the connecting portion 9 while increasing pressure at this point, and venting occurs near the inside of the handle at the connecting portion 9, avoiding the formation of air marks. Both sides of the venting groove 11 are outwardly convex arc surfaces, where "outward" refers to the direction away from the groove side. One side of the venting groove 11 transitions arc-shaped to the bottom surface of the hollow structure of the grip portion 10, and the arc transition point is located at the outwardly convex part of the venting groove 11. During molding, the gas flows more smoothly and steadily from the space corresponding to the grip portion 10 of the mold over the panel corresponding to the venting groove 11, avoiding gas turbulence. Furthermore, the side of the venting groove 11 that transitions arc-shaped to the bottom surface of the hollow structure also transitions arc-shaped to the bottom slope of the groove, further ensuring smooth and stable gas flow.

[0036] The vertical distance between the inner bottom of the vent groove 11 and the outer side of the handle is B1, and the vertical distance between the inner and outer sides of the handle at the vent groove is B2. B1 / B2 = 3 / 22-5 / 22, specifically 4 / 22 in this embodiment. The specific explanations of B1 and B2 are referenced in A1 and A2, and will not be repeated here. Through experimental verification by the inventors, this proportional limitation effectively prevents the outer surface of the connection 9 from collapsing due to reduced venting pressure. The inner width of the vent groove 11 is 4 / 26-7 / 26 of the handle width, specifically 5 / 26 in this embodiment. The explanation of this width is referenced in the air intake groove, and will not be repeated here. This proportional limitation ensures that both ends of the groove are completely filled with solid plastic, without any air holes.

[0037] In this embodiment, the car tailgate handle is formed using gas-assisted molding, and the specific structure of the mold used is as follows:

[0038] like Figure 4 As shown, the mold cavity includes a gripping part 10 and connecting parts 9 located at both ends of the gripping part 10. The transition surfaces connecting the gripping part 10 and the two connecting parts 9 are provided with plates. The plate near one of the connecting parts 9 is an air inlet plate 5, and the connecting part 9 is an air inlet connecting part 9. The other plate is an exhaust plate 3, and the corresponding other connecting part 9 is an exhaust connecting part 9. An air inlet is provided at the end of the air inlet connecting part 9 near the bottom of the air inlet plate 5, and an exhaust outlet is provided at the end of the exhaust connecting part 9 near the bottom of the exhaust plate 3.

[0039] An air inlet is connected to an air passage 7, and an air needle 8 perpendicular to the axis of the air passage 7 is provided on the side wall of the air passage 7.

[0040] The top of the air intake plate 5 is arc-shaped; the top of the exhaust plate 3 is a slope, which slopes towards the bottom of the exhaust connection 9 along the direction from the gripping part 10 to the exhaust connection 9; both sides of the air intake plate 5 and the exhaust plate 3 are outwardly convex arc surfaces. The vertical distance between the top of the air intake plate 5 and the upper side of the mold cavity is a1, and the vertical distance between the transition surface of the air intake plate 5 and the upper side of the mold cavity is a2, a1 / a2=1 / 22-4 / 22, specifically 4 / 22 in this embodiment; the vertical distance between the top of the exhaust plate 3 and the upper side of the mold cavity is b1, and the vertical distance between the transition surface of the exhaust plate 3 and the upper side of the mold cavity is b2, b1 / b2=3 / 22-5 / 22, specifically 4 / 22 in this embodiment; the width of both the air intake plate 5 and the exhaust plate 3 is 4 / 26-7 / 26 of the width of the mold cavity, specifically 5 / 26.

[0041] During gas-assisted molding, the aforementioned mold is used. When injecting gas, the gas is injected through the gas needle 8, and then passes through the gas channel 7, enters the air inlet connection part 9, then passes over the air inlet panel 5, enters the grip part 10, and finally passes over the exhaust panel 3, enters the exhaust connection part 9, thereby realizing the formation of the hollow structure of the pull handle. As for the various process parameters, the original ones can still be used as appropriate.

[0042] Another embodiment of the present invention provides a car tailgate including the car tailgate handle described above, wherein the car tailgate handle is connected to the car tailgate via two connecting parts 9.

[0043] Another embodiment of the present invention provides a car including the tailgate described in the above embodiments, wherein the tailgate is assembled on the side of the car.

[0044] For those skilled in the art, without departing from the concept of the present utility model, several modifications and improvements can be made, and these should also be considered within the scope of protection of the present utility model. These will not affect the effectiveness of the implementation of the patent or the practicality of the patent.

Claims

1. A car tailgate handle, comprising a gripping portion and connecting portions connected to both ends of the gripping portion, wherein the gripping portion and the connecting portions have interconnected hollow structures, characterized in that: The grip and the transition surface where the two connecting parts are connected are provided with grooves. The grooves are formed by the indentation of the inner side of the handle into the hollow structure. The groove near one of the connecting parts is the air intake groove, and the other groove is the exhaust groove.

2. The car tailgate handle according to claim 1, characterized in that: The bottom of the air intake recess is rounded.

3. A car tailgate handle according to claim 1, characterized in that: The bottom of the vent groove is a slope, which is inclined towards the inside of the handle along the direction from the grip to the connection.

4. A car tailgate handle according to claim 1, characterized in that: Both sides of the air intake groove and the exhaust groove are outwardly convex arc surfaces.

5. A car tailgate handle according to claim 1, characterized in that: The vertical distance between the inner side of the bottom of the air intake groove and the outer side of the handle is A1, and the vertical distance between the inner side of the handle and the outer side of the handle at the air intake groove is A2. A1 / A2 = 1 / 22-4 / 22.

6. A car tailgate handle according to claim 1, characterized in that: The vertical distance between the inner side of the bottom of the exhaust groove and the outer side of the handle is B1, and the vertical distance between the inner side of the handle and the outer side of the handle at the exhaust groove is B2. B1 / B2 = 3 / 22 - 5 / 22.

7. A car tailgate handle according to claim 1, characterized in that: The inner width of both the air intake and exhaust recesses is 4 / 26 to 7 / 26 of the handle width.

8. A car tailgate handle according to claim 4, characterized in that: The outer side of both the air intake groove and the outer side of the exhaust groove transition into the bottom surface of the hollow structure of the grip in an arc shape.

9. A car tailgate, characterized in that: Includes the car tailgate handle as described in any one of claims 1-8.

10. A car, characterized in that: Including the car tailgate as described in claim 9.

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