Automobile roof front cross beam and fixing structure thereof

Abstract

The utility model relates to the technical field of automobile parts, in particular to an automobile ceiling front cross beam and a fixing structure thereof, which comprises a cross beam body, two edges of the cross beam body in the length direction are respectively provided with an outer flange and an inner flange, the middle position of the inner flange is provided with a fracture, and the left end and the right end of the cross beam body are respectively provided with a positioning hole. According to the automobile ceiling front beam, the fracture is formed in the middle of the inner flanging, and the first lightening hole, the second lightening hole, the third lightening hole and the like are formed in the proper positions of the surface of the beam body, so that a traditional automobile ceiling front beam structure is reasonably optimized and improved, and it is guaranteed that the automobile ceiling front beam meets the requirements for strength and safety attributes; the problem of NVH caused by modal frequency coupling between the ceiling front cross beam and the front windshield is avoided, the NVH level of the whole vehicle is improved, meanwhile, compared with a traditional ceiling front cross beam, the weight of the ceiling front cross beam structure is reduced by about 15%, the cost is reduced by about 10% through the first lightening holes, and therefore weight reduction and cost reduction of the whole vehicle are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile parts, and particularly relates to an automobile roof front cross beam and a fixing structure thereof. BACKGROUND

[0002] The roof front cross beam is an indispensable part in automobile production and manufacturing, and is a connecting bridge between the front windshield and the roof, and it also has a potential impact on the overall NVH performance of the vehicle.

[0003] Chinese patent CN218536867U provides a roof front cross beam structure and a vehicle. In order to improve the quietness and comfort of the vehicle, a reinforcing plate is added to the roof front cross beam to improve the overall strength of the roof front cross beam structure and reduce the vibration response sensitivity, thereby achieving the effect of reducing the vibration response at this position. However, this structure optimization scheme not only increases the weight of the vehicle, but also increases the development cost of the sample vehicle; Chinese patent CN217320517U provides a roof front cross beam structure and a vehicle. The roof front cross beam upper plate is extended in the front-rear direction of the vehicle to form a hollow channel structure with the roof front cross beam upper plate, and a reinforcing plate is used to connect the roof front cross beam upper plate and the lower plate to form a cavity structure, thereby improving the dynamic stiffness of the roof front cross beam and the NVH performance of the vehicle. However, this structure optimization scheme involves many parts, and the specific implementation is still relatively complicated.

[0004] In summary, the existing roof front cross beam structure of the vehicle is optimized for safety attributes, strength attributes, or the need to reduce vibration response sensitivity, but to some extent, there is an increase in cost and weight. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of automobile roof front cross beam and its fixed structure, solve the technical problem that the roof front cross beam structure is optimized for safety attributes, strength attributes or the need to reduce vibration response sensitivity in prior art, to some extent, there is an increase in cost and weight.

[0006] In view of the above problems, the technical scheme provided by the utility model is as follows:

[0007] A roof front cross beam of a vehicle, comprising a cross beam body, the two edges of the cross beam body in the length direction are respectively provided with an outer turning edge and an inner turning edge, a fracture is arranged at the middle position of the inner turning edge, positioning holes are arranged at the left and right ends of the cross beam body, and first, second and third weight reduction holes are further arranged on the cross beam body.

[0008] Further, an installation groove is arranged at the middle position of the cross beam body, and two groups of reading lamp mounting holes are arranged in the installation groove.

[0009] Further, the two sides of the mounting groove of the cross beam body are provided with bosses, and the bosses are provided with roof fixing holes.

[0010] Further, the first weight-reducing holes are arranged in the middle of the mounting groove, the second weight-reducing holes are arranged between the mounting groove and one of the bosses, and the third weight-reducing holes are arranged between the mounting groove and the other of the bosses.

[0011] Further, the cross beam body is an arc-shaped strip structure formed integrally, and the two ends of the cross beam body are matched with mounting plates fixed on the outer plate of the roof of the automobile.

[0012] Further, the two ends of the cross beam body are provided with buckle holes matched with buckles on the mounting plates.

[0013] Further, the first weight-reducing holes, the second weight-reducing holes and the third weight-reducing holes are quadrilateral structures, and the first weight-reducing holes, the second weight-reducing holes and the third weight-reducing holes are formed by continuous stamping.

[0014] Further, the cross beam body is made of aluminum alloy, and the thickness of the cross beam body is not less than 3mm.

[0015] The utility model also provides a fixing structure which comprises the automobile roof front cross beam.

[0016] Compared with the prior art, the utility model has the beneficial effects that: the traditional automobile roof front cross beam structure is reasonably optimized and improved by the fracture arranged in the middle of the inward flanging and the first weight-reducing holes, the second weight-reducing holes and the third weight-reducing holes arranged at appropriate positions on the surface of the cross beam body, the automobile roof front cross beam meets the requirements of strength and safety, the NVH problem caused by the modal frequency coupling between the roof front cross beam and the front windshield is avoided, the NVH level of the whole vehicle is improved, and the roof front cross beam structure is reduced by about 15% and the cost is reduced by about 10% of the first weight-reducing holes compared with the traditional roof front cross beam, so that the weight and cost of the whole vehicle are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can be obtained without creative labor on the basis of the drawings.

[0018] Figure 1The structure schematic diagram of the utility model;

[0019] Figure 2 The objective data bottom test curve diagram is;

[0020] Figure 3 The modal vibration mode schematic diagram of the front roof crossbeam, the front windshield and the roof is;

[0021] Figure 4 The utility model and original state roof front crossbeam original point frequency response simulation result contrast curve diagram is;

[0022] Figure 5 The utility model and original state roof front crossbeam original point frequency response simulation result contrast curve diagram is;

[0023] Figure 6 The utility model and original state roof front crossbeam original point frequency response simulation result contrast curve diagram is;

[0024] Figure 7 The utility model and original state roof front crossbeam original point frequency response simulation result contrast curve diagram is.

[0025] In the drawing: 1, crossbeam body; 2, outer turning edge; 3, inner turning edge; 4, fracture; 5, installation groove; 6, reading lamp installation hole; 7, boss; 8, roof fixing hole; 9, positioning hole; 10, first weight-reducing hole; 11, second weight-reducing hole; 12, third weight-reducing hole; 13, hasp hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantage of the utility model embodiment clearer, the following will combine the drawings in the utility model embodiment, and the technical scheme in the utility model embodiment is clearly and completely described, obviously, the described embodiment is a part of the utility model, instead of all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the protection scope of the utility model.

[0027] Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the protection scope of the utility model.

[0028] Please refer to Figure 1The application discloses a front roof crossbeam of a car, which comprises a crossbeam body 1, wherein the crossbeam body 1 is an integrally-formed arc-shaped strip structure, the two ends of the crossbeam body 1 are matched with mounting plates fixedly mounted on an outer plate of a roof of the car, the two edges of the crossbeam body 1 in the length direction are respectively provided with an outer turning edge 2 and an inner turning edge 3, the middle position of the inner turning edge 3 is provided with a break 4, compared with the original front roof crossbeam structure of the car, only the two ends of the inner turning edge 3 are reserved, when the crossbeam body 1 is fixedly mounted on the outer plate of the roof of the car through the mounting plates at the two ends, the inner turning edge 3 only contacts the edges of the mounting plates at the two ends of the crossbeam body 1, and the inner turning edge 3 no longer contacts the outer plate of the roof of the car, so that the joint between the inner turning edge 3 and the outer plate of the roof of the car does not need to be sealed and connected through structural glue, the middle position of the crossbeam body 1 is provided with a mounting groove 5, two groups of reading lamp mounting holes 6 are arranged in the mounting groove 5, the reading lamp mounting holes 6 can be used for positioning and mounting reading lamps of the car, the two sides of the crossbeam body 1, at the positions of the mounting groove 5, are both provided with a boss 7, the boss 7 is provided with a roof fixing hole 8, which is used for positioning and mounting an interior roof of the car, the left and right ends of the crossbeam body 1 are both provided with a positioning hole 9, and the crossbeam body 1 is further provided with a first weight-reducing hole 10, a second weight-reducing hole 11 and a third weight-reducing hole 12, wherein the first weight-reducing hole 10 is arranged at the middle position of the mounting groove 5, the second weight-reducing hole 11 is arranged between one group of the bosses 7 and the mounting groove 5, and the third weight-reducing hole 12 is arranged between two groups of the bosses 7 and the positioning holes 9.

[0029] Objective data investigation test is carried out for the high gear acceleration 1400rpm booming problem of a pickup truck (as shown in Figure 2 The test results show that the front roof crossbeam and the front windshield vibration are related to the booming noise in the car. The modal data of the front roof crossbeam, the front windshield and the roof are tested (as shown in Figure 3 The objective test data show that the front windshield and the front roof crossbeam have modal coupling at 48Hz. It is judged that the booming noise in the car is caused by the engine excitation transmission during the acceleration process, which causes the modal coupling resonance of the front windshield and the roof. Therefore, the traditional front roof crossbeam structure of the car is optimized according to the above test results. Compared with the traditional structure, the first weight-reducing hole 10, the second weight-reducing hole 11 and the third weight-reducing hole 12 are arranged at appropriate positions on the crossbeam body 1. In addition, the break 4 at the middle position of the inner turning edge 3 makes the inner turning edge 3 only reserve the two ends. When the crossbeam body 1 is fixedly mounted on the outer plate of the roof of the car through the mounting plates at the two ends, the inner turning edge 3 only contacts the edges of the mounting plates at the two ends of the crossbeam body 1, and the inner turning edge 3 no longer contacts the outer plate of the roof of the car, thereby avoiding the contact noise between the two. At the same time, the joint between the inner turning edge 3 and the outer plate of the roof of the car does not need to be sealed and connected through structural glue. After the structure is optimized, the simulation verification and experimental verification of the frequency response results of the front roof crossbeam are compared (as shown inFigure 4 As shown in the figure), the top front beam original point frequency response is reduced by about 7Hz (44Hz→37Hz) compared with the original state frequency, and the frequency response sensitivity is basically the same. According to the comparison of the top front beam original point frequency response test results, it can be obtained (as shown in the figure) Figure 5 As shown in the figure), the top front beam structure is shifted by about 10Hz (46.51→36.34Hz) compared with the original state top front beam original point frequency response; the actual road verification result can be obtained (as shown in the figure) Figure 6 、 7 As shown in the figure), the second-order noise in the vehicle is optimized by about 10dB compared with the original state, and the second-order vibration of the front windshield and the top front beam is optimized by about 60%. Therefore, the above technical improvement not only ensures that the automobile top front beam meets the requirements of strength and safety properties, but also avoids the NVH problem caused by the modal frequency coupling between the top front beam and the front windshield, improves the NVH level of the whole vehicle, and reduces the weight and cost of the whole vehicle by about 15% and 10% respectively due to the setting of the first weight reduction hole 10, the second weight reduction hole 11, the third weight reduction hole 12 and the fracture 4. Therefore, it is beneficial to the weight reduction and cost reduction of the whole vehicle.

[0030] Further, please refer to Figure 1 The buckle holes 13 are provided at both ends of the beam body 1, which are matched with the buckles on the mounting plate. When the mounting plate is fixed on both sides of the automobile roof by screws, the two ends of the beam body 1 can be buckled on the mounting plate through the buckle holes 13, so as to fix the beam body 1.

[0031] Further, please refer to Figure 1 The first weight reduction hole 10, the second weight reduction hole 11 and the third weight reduction hole 12 are all quadrilateral structures, and the first weight reduction hole 10, the second weight reduction hole 11 and the third weight reduction hole 12 are formed by continuous stamping, so that the forming quality is stable and suitable for batch production mode.

[0032] Further, the beam body 1 is made of aluminum alloy, so that the beam body 1 has the characteristics of high strength and light weight. The thickness of the beam body 1 is not less than 3mm, which ensures the strength performance of the beam body 1 and prevents it from being deformed.

[0033] The utility model also provides a kind of fixed structure, including above-mentioned automobile roof front beam.

[0034] The above is only preferred embodiment of the utility model, and is not used to limit the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An automobile roof front crossbeam, comprising a crossbeam body (1), two edges of the crossbeam body (1) in length direction are respectively provided with an outer turning edge (2) and an inner turning edge (3), a middle position of the inner turning edge (3) is provided with a fracture (4), both left and right end positions of the crossbeam body (1) are provided with positioning holes (9), and the crossbeam body (1) is further provided with a first weight-reducing hole (10), a second weight-reducing hole (11) and a third weight-reducing hole (12).

2. The automobile headliner front cross beam according to claim 1, characterized in that, A middle position of the crossbeam body (1) is provided with a mounting groove (5), and the mounting groove (5) is internally provided with two groups of reading lamp mounting holes (6).

3. The automotive headliner cross-car beam of claim 2, wherein, Both sides of the crossbeam body (1) located at the mounting groove (5) are provided with bosses (7), and the bosses (7) are provided with roof fixing holes (8).

4. The automotive headliner cross-car beam of claim 3, wherein, The first weight-reducing hole (10) is arranged in the middle position of the mounting groove (5), the second weight-reducing hole (11) is arranged between one group of the bosses (7) and the mounting groove (5), and the third weight-reducing hole (12) is arranged between two groups of the bosses (7) and the positioning holes (9).

5. The automotive headliner cross-car beam of claim 1, wherein, The crossbeam body (1) is an integral forming arc-shaped strip structure, and the two end profiles of the crossbeam body (1) are matched with mounting plates fixed on the outer plate of the automobile roof.

6. The automotive headliner cross-car beam of claim 1, wherein, The two ends of the crossbeam body (1) are provided with buckle holes (13) matched with buckles on the mounting plate.

7. The automotive headliner cross-car beam of claim 1, wherein, The first weight-reducing hole (10), the second weight-reducing hole (11) and the third weight-reducing hole (12) are all quadrilateral structures, and the first weight-reducing hole (10), the second weight-reducing hole (11) and the third weight-reducing hole (12) are formed by continuous stamping.

8. The automotive headliner cross-car beam of claim 1, wherein, The crossbeam body (1) is made of aluminum alloy, and the thickness of the crossbeam body (1) is not less than 3mm.

9. A fixing structure characterized by comprising: The automobile roof front crossbeam according to any one of claims 1-8.

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