Plastic hollow longitudinal bracket and method for producing such plastic hollow longitudinal bracket

Abstract

The invention relates to a plastic hollow longitudinal bracket (19) which is produced in a fluid internal pressure injection molding process in which, in an injection molding step, a molten injection substance of the plastic can be injected under pressure and heat into a mold cavity (33) of an injection mold (35) and a fluid (G) is introduced into the mold cavity (33) in an internal pressure molding step, the plastic core melted by means of the internal pressure forming step is pushed, more particularly when a hollow channel (23) is formed in the plastic hollow longitudinal support (19). According to the invention, in order to increase the stability of the component, a hollow profile insert part (21) is embedded in the plastic material of the plastic hollow longitudinal support (19), said hollow profile insert part indirectly or directly surrounding the hollow channel (21) in the cross-section in an annular manner.

Description

Technical Field

[0001] The present invention relates to a plastic hollow longitudinal bracket (or plastic hollow long bracket, i.e., ), and a method for manufacturing such a plastic hollow longitudinal support according to claims 4 and 10. Background Art

[0002] A plastic hollow longitudinal support of this type is known from DE 10 2019 209 326 A1, which is manufactured using a fluid internal pressure injection molding process. The process has an injection molding step, in which a molten injection molding material of the plastic can be injected into the cavity of the injection mold under pressure and heat. The injected injection molding material solidifies at the mold surface that limits the cavity, more precisely (or "that is", und zwar) while the internal plastic core (Kunststoffseele) is still molten. In the subsequent internal pressure molding step, the fluid is introduced into the mold cavity, and the molten plastic core is pushed by means of this internal pressure molding step, more precisely, when a hollow channel is formed in the plastic hollow longitudinal support.

[0003] A support for a lining component is known from EP 2 347 920 A1. A mounting support is known from DE 10 2011 112 913 A1. Summary of the invention

[0004] The object of the present invention is to provide a plastic longitudinal hollow carrier, the component stability of which is increased in a simple manner compared to the prior art.

[0005] This object is achieved by the features of claim 1, 4, 5 or 10. Preferred developments of the invention are disclosed in the dependent claims.

[0006] The present invention is based on a plastic hollow longitudinal support, which is manufactured by a fluid internal pressure injection molding process, in which the molten injection material of the plastic can be injected into the cavity of the injection mold under pressure and heat during the injection molding step. The injected injection material solidifies at the mold surface that limits the cavity, more precisely, when the internal plastic core is still molten. In the subsequent internal pressure molding step, the fluid is introduced into the mold cavity, by means of which the molten plastic core is pushed. In this way, a hollow channel is molded in the plastic hollow longitudinal support. According to the characterizing portion of claim 1, in order to improve the component stability of the plastic hollow longitudinal support, a hollow profile insert is additionally embedded in the plastic material. The hollow profile insert indirectly or directly surrounds the hollow channel in a ring shape in the cross section. In this way, the hollow channel in the plastic hollow longitudinal support is additionally reinforced by means of the hollow profile insert, so that load application points such as hinges, flap buffers or gas spring connections can be provided at the plastic hollow longitudinal support.

[0007] In one technical embodiment, the hollow profile insert component can be constructed in one piece or in multiple pieces from a shell-shaped insert base and from an insert transverse element. The shell-shaped insert base has a profile base and profile side walls rising therefrom. The two profile side walls of the insert base can be connected to one another in a force-transmitting manner via an insert transverse element arranged at a distance from the profile base.

[0008] During the injection molding step, the mold cavity and in particular the inner profile space bounded by the hollow profile insert part is completely filled with molten injection molding compound. This is followed by an internal pressure molding step, which completely or partially pushes the plastic core located in the profile space of the hollow profile insert part while molding the hollow channel. In this way, a very strong construction of the plastic hollow longitudinal support is obtained with the aid of the hollow profile insert part.

[0009] Alternatively and / or additionally, the hollow profile insert or any other insert embedded in the plastic material of the plastic hollow longitudinal support can be provided with an additional reinforcement structure, which can prevent deformation of the insert during the injection process and the internal compression molding step.

[0010] For example, the insert part can be a flat plastic or sheet metal part. Preferably, the reinforcement structure can be a press-in which is formed in one piece with the same material in the insert part.

[0011] In another alternative embodiment, the insert part can be constructed from at least two individual segments, which are joined together at a flange connection. In the flange connection, the joining flanges of the two individual segments overlap each other to form a strong double-walled structure of the component. Preferably, the flange connection can form a reinforcement structure.

[0012] The reinforcement structure can extend beyond the base section of the insert element by the profile height. It is expedient for the installation space if the reinforcement structure extends into the hollow channel, so that the outer dimensions of the plastic hollow longitudinal support are not affected by the reinforcement structure.

[0013] In another embodiment variant, the insert part can be associated with a separate additional element, which forms a reinforcement structure. The additional element can be connected to the insert part base section at the joint. In addition, the additional element can be raised.

[0014] In one technical implementation, the plastic hollow longitudinal support can be a component of a rear flap inner part, which is covered by a rear flap outer part to prevent it from being seen. The rear flap inner part and the rear flap outer part together form the rear flap (Heckklappe, sometimes called tailgate) of the vehicle, wherein the rear flap inner part provides a rear flap structure that carries loads, and rear flap components such as hinges, flap buffers or gas spring connections are provided at the rear flap structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0016] in:

[0017] Figure 1 and 2 A view of the rear clamshell of the vehicle is shown respectively;

[0018] Figures 3 to 11 The figures respectively show a view of a hollow plastic longitudinal support which is a component of the rear flap inner part. DETAILED DESCRIPTION

[0019] exist Figure 1 In the figure, a two-track vehicle with a rear flap 1 is shown in a view from the rear of the vehicle. The rear flap 1 closes the loading space at the rear of the vehicle and is hinged at the top of the vehicle via a rear flap hinge (not shown) to the rear roof transverse support of the vehicle. Figure 2 As can be seen, the rear flap 1 is constructed of a rear flap inner part 3 inside the vehicle and a rear flap outer part 5 outside the vehicle. The rear flap inner part 3 forms a rear flap structure that bears loads and is covered by the rear flap outer part 5 outside the vehicle to prevent it from being seen. Figure 2In the embodiment, the rear flap outer part 5 is connected to the rear flap inner part 3 via an adhesive 7. Both the rear flap inner part 3 and the rear flap outer part 5 are manufactured as plastic injection molded parts. In addition, the rear flap inner part 3 and the rear flap outer part 5 are basically implemented in the same way as the structure disclosed in DE 10 2019 209 326 A1. That is, both the rear flap inner part 3 and the rear flap outer part 5 surround the rear window 17 in a closed frame-like manner, wherein a rear windshield flange 15 ( Figure 2 ), the rear windshield 17 is supported on the rear windshield flange.

[0020] The core of the present invention lies in the special design of the rear flap inner part 2. Similar to DE 102019 209 326A1, the rear flap inner part 3 has a plastic longitudinal hollow bracket 19 with a hollow channel 23 as a reinforcement structure. The plastic longitudinal hollow bracket 19 extends around the rear windshield 17 in the frame peripheral direction (continuously or with interruptions) and is Figure 2 Shown in cross section.

[0021] As from Figure 2 As can be seen in the figure, the plastic hollow longitudinal support 19 has a hollow profile insert part 21, which is at least partially embedded in the plastic material 20 of the plastic hollow longitudinal support 19. The hollow profile insert part 21 surrounds the hollow channel 23 of the plastic hollow longitudinal support 19 in a circular manner in cross section. The inner side of the hollow profile insert part 21 that delimits the hollow channel 23 is covered with the plastic material 20, which directly delimits the hollow channel 23.

[0022] according to Figure 2 Or 3, the hollow profile insert part 21 is constructed in two parts from a shell-shaped insert base body 25 and from an insert transverse element 27. Both the shell-shaped insert part 39 and the insert transverse element 27 are realized, for example, as flat, profiled sheet metal parts.

[0023] The shell-shaped insert base 25 has a profile base 29 and profile side walls 31 rising therefrom. The insert transverse element 27 is joined to the two profile side walls 31 of the insert base 25 at a joining point 28 (e.g. by welding), so that the two profile side walls 31 are connected to each other in a force-transmitting manner via the insert transverse element 27. Figure 2 A reinforcing rib 22 made of plastic material 20 is injection-molded onto the upper side of the inserted transverse element 27 .

[0024] Follow the steps below Figures 3 to 7 Describes a method for manufacturing Figure 2 The method of the plastic hollow longitudinal support 19 shown in FIG. Therefore, firstly according to Figure 3A hollow profile insert component 21 is provided. The hollow profile insert component 21 is inserted in the insertion step ( Figure 4 ) is inserted into the mold cavity 33 of the injection mold 35. Then the injection molding step ( Figure 5 ), in which the mold cavity 33 and in particular also the profile space 37 ( Figure 3 or 4) completely filled with molten injection molding material 38. In the subsequent process development, the internal pressure molding step ( Figure 6 ), in which the gas filling G is introduced into the mold cavity 33 under pressure. As a result, the still molten plastic core in the profile space 37 of the hollow profile insert 21 is at least partially pushed out while forming the hollow channel 23. After the hardening of the injection molding compound 38, a demolding step is performed, in which the finished plastic hollow longitudinal bracket 19 ( Figure 7 ).

[0025] The following is in accordance with Figures 8 to 11 A plastic hollow longitudinal support 19 according to another embodiment is described. Figure 8 2 shows a plastic hollow longitudinal support 19 with a hollow channel 23, in which an insert component 39 is also embedded in the plastic material 20 of the plastic hollow longitudinal support in order to increase the component stability of the plastic hollow longitudinal support 19. The shell-shaped insert component 39 is connected to the hollow longitudinal support 19 according to the embodiment of the present invention. Figures 2 to 7 The insert base 25 is shaped substantially identically, namely with a profile base 29 and profile side walls 31 rising therefrom.

[0026] As from Figure 8 As can be seen, the insert 39 has an indentation 41 in the region of the hollow channel 23. This indentation serves as a reinforcement structure, by means of which deformation of the insert 39 can be prevented during the internal pressure forming step. Figure 8 In the embodiment of the present invention, the press-in portion 41 is formed in one piece and of a uniform material in the profile base 29 of the shell-shaped insert part 39 .

[0027] Alternatively, in Fig. 9 In the embodiment, the insert part 39 is constructed of two individual segments 43, which are firmly connected to each other at the flange connection F (for example, by welding). At the flange connection F, the joint flanges 44 of the two individual segments 43 overlap each other while forming a strong double-walled structure of the component. In addition, the joint flange 44 is bent upward at a right angle from the profile bottom 29. In this case, the flange connection F forms a reinforcement structure, by means of which deformation of the insert part 39 is prevented during the internal pressure molding step.

[0028] As from Figure 8 and Fig. 9 As further shown in FIG. 1 , the press-fit portion 41 or the flange connection F extends into the hollow channel 23 by the profile height h. In this way, despite the press-fit portion 41 or the flange connection F, the outer dimensions of the plastic hollow longitudinal support 19 remain unchanged.

[0029] exist Fig.10 In the embodiment shown in FIG, a separate additional element 47 is associated with the insert part 39. The additional element 47 is connected to the insert part 39 at the joint 49 and forms a reinforcement structure together with the profile bottom 29 of the insert part 39, by means of which deformation of the insert part 39 is prevented during the internal pressure forming step. Fig.10 In the embodiment shown in FIG. 2 , the additional element 47 protrudes between two joining locations 49 by a profile height h in the direction of the hollow channel 23 .

[0030] exist Fig.11 In Fig. 9 As in the example, the insert part 39 is constructed from two individual segments 43, which are firmly connected to each other at a flange connection F (for example, by welding). At the flange connection F, the joining flanges 44 of the two individual segments 43 overlap each other, forming a strong double-walled structure of the component. In this case, the flange connection F forms a reinforcement structure, by means of which deformation of the insert part 39 is prevented during the internal pressure molding step. Fig. 9 Different, in Fig.11 In the embodiment shown in FIG. 2 , the joining flange 44 is not bent upright from the profile base 29 , but rather the joining flange is located together with the profile base in a horizontal plane.

[0031] Reference Numbers List

[0032] 1 Rear flap

[0033] 3 Rear flap inner parts

[0034] 5 Rear cover outer parts

[0035] 7 Adhesives

[0036] 15 Rear windshield flange

[0037] 17 Rear windshield

[0038] 19 Plastic longitudinal hollow bracket

[0039] 20 Plastic Materials

[0040] 21 Hollow profile inserts

[0041] 22 Reinforcement

[0042] 23 Hollow Channel

[0043] 25 Insertion matrix

[0044] 27 Inserting transverse elements

[0045] 28 Joint

[0046] 29 Profile bottom

[0047] 31 Profile side wall

[0048] 33 mold cavity

[0049] 35 Injection mold

[0050] 37 Profile Space

[0051] 38 Injection molding material

[0052] 39 Insert parts

[0053] 41 Press-fit section

[0054] 43 single segments

[0055] 44 Joint flange

[0056] 47 Add-ons

[0057] 49 Joint

[0058] F Flange connection

[0059] H profile height

[0060] G Gas filling

Claims

1. A plastic hollow longitudinal support (19), which is manufactured by a fluid internal pressure injection molding process, in which in the injection molding step, a molten injection molding material (38) of a plastic (20) can be injected into a mold cavity (33) of an injection mold (35) under pressure and heat, and in the internal pressure molding step, a fluid (G) is introduced into the mold cavity (33), by means of which a still molten plastic core is pushed, more precisely, a hollow channel (23) is molded in the plastic hollow longitudinal support (19), characterized in that In order to increase component stability, a hollow profile insert (21) is embedded in the plastic material (20) of the plastic hollow longitudinal support (19), which indirectly or directly surrounds the hollow channel (21) in a circular shape in cross section.

2. The plastic hollow longitudinal bracket according to claim 1, characterized in that: The hollow profile insert part (21) is constructed in one piece or in multiple pieces, and in particular the hollow profile insert part (21) is constructed in at least two pieces from a shell-shaped insert base (25) with a profile bottom (29) and profile side walls (31) rising from the profile bottom, and from an insert transverse element (27) which connects the two profile side walls (31) of the insert base (25) to one another in a force-transmitting manner.

3. The plastic hollow longitudinal support according to claim 1 or 2, characterized in that: In the injection molding step, the mold cavity (33), in particular the profile space (37) limited by the hollow profile insert part (21), is completely filled with molten injection molding material, and in the subsequent internal pressure molding step, the plastic core located in the profile space (37) of the hollow profile insert part (21) is completely or partially pushed out while forming the hollow channel (23).

4. A method for producing a plastic hollow longitudinal support (19) according to any one of the preceding claims.

5. A plastic hollow longitudinal support (19), in particular according to any one of the preceding claims, which is manufactured by a fluid internal pressure injection molding process, in which in the injection molding step, the molten injection material (38) of the plastic (20) can be injected into the mold cavity (33) of the injection mold (35) under pressure and heat, and in the internal pressure molding step, the fluid (G) is introduced into the mold cavity (33), by means of which the molten plastic core is pushed, more precisely, when a hollow channel (23) is molded in the plastic hollow longitudinal support (19), characterized in that In order to improve the stability of the component, an insert component (39) is embedded in the plastic material (20) of the plastic hollow longitudinal bracket (19), and the insert component (39) has a reinforcement structure (41; 47; F) in the area of ​​the hollow channel (23), by means of which deformation of the insert component (39) can be prevented during the injection process and the internal pressure molding step.

6. The plastic hollow longitudinal support according to claim 5, characterized in that: The reinforcement is a press-in (41) which is formed in one piece with a single material component in the insert (39) and / or the insert (39) is a flat plastic or sheet metal component.

7. The plastic hollow longitudinal support according to claim 6, characterized in that: The insert part (39) is constructed from at least two individual segments (43), which are connected to each other at a flange connection (F), at which the joining flanges (44) of the two individual segments (43) overlap to form a strong double-walled structure of the component, and the flange connection (F) forms the reinforcement structure (41).

8. The plastic hollow longitudinal support according to claim 5, characterized in that: The reinforcement structure (41; 47; F) protrudes from the insert part (39) by a profile height (h) and / or the reinforcement structure (41) protrudes into the hollow channel (23).

9. The plastic hollow longitudinal support according to claim 5, characterized in that: The reinforcement structure has an additional element (47) which is connected to the insert part (39) at a joining point (49), and in particular the additional element (47) is raised by a profile height (h) between the joining points (49).

10. A method for producing a plastic hollow longitudinal support (19) according to any one of claims 5 to 9.

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