Mounting structure for vehicle head-up display device, instrument cross beam component and method

Abstract

The invention discloses a mounting structure for a vehicle head-up display device, an instrument cross beam component and a method, solves the problems that an HUD mounting bracket in the prior art is unfavorable for a whole vehicle steering mode and cannot stably support the head-up display device, and has the beneficial effects of ensuring the vehicle steering mode and stably supporting the head-up display device. According to the specific scheme, the installation structure for the vehicle head-up display device comprises an installation support which is of an integrated structure, the installation support is provided with a supporting groove to support the head-up display device, the supporting groove is attached to the lower half section of the head-up display device, the installation support is provided with a plurality of open holes, and the open holes are communicated with the supporting groove to facilitate signal transmission; a connecting edge is arranged on the side portion of the supporting groove of the mounting support, the connecting edge can make contact with the head-up display device so that a fastener can conveniently connect the connecting edge with the head-up display device, one side of the mounting support can be connected with a cab front bin, and the other side of the mounting support is connected with a main pipe beam.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a mounting structure, an instrument cross beam component and a method for a vehicle head-up display device. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] With the advancement and development of vehicles, the vehicle-mounted head-up display HUD technology has become relatively common. HUD uses the principle of optical reflection to project navigation, vehicle speed, tire pressure and other information onto the front windshield, making it easy for car owners to quickly understand the basic information of the vehicle and improve driving safety.

[0004] In the prior art, the HUD mounting structure is installed on the sheet metal bracket of the instrument cross beam, which has high requirements on dimensional accuracy. In addition, the HUD mounting bracket is welded together by multiple welding brackets. Figure 1 As shown, such mounting bracket usually includes a first mounting bar 1, a second mounting bar 2, a first U-shaped frame 3 is arranged on the first mounting bar, the second mounting bar 2 supports the second U-shaped frame 4, and a middle support frame 6 is also arranged between the first mounting bar and the second mounting bar. A mounting portion 5 is arranged on one side of the middle support frame 6 for connection with the front compartment of the cab. The middle support frame is also used for connection with the steering column. Obviously, there is a problem of complex structure. The mounting bars on both sides of the HUD mounting bracket are installed separately, which leads to that the installation extreme difference of the mounting bars on both sides cannot be guaranteed, the dimensional accuracy cannot be controlled, and it is easy to cause the problem of projection onto the windshield deviating from the line of sight area; on the other hand, the middle support frame is integrated with the connection with the front compartment of the cab and the steering column, but the middle support frame and the HUD mounting bracket are separate modules, and there is no connection between the front compartment of the cab, the steering column and the HUD mounting bracket. During the steering process of the vehicle, the mounting bracket is easily separated from the steering mechanism, which is not conducive to ensuring the steering mode of the whole vehicle and is easy to resonate with the engine.

[0005] In addition, the prior art discloses a HUD bracket structure in which both sides of the HUD bracket are connected as one, but the structure does not take into account the connection between the HUD bracket and the steering column, and still cannot effectively ensure the steering mode of the entire vehicle. Moreover, the HUD bracket is a flat structure, which only provides simple support for the HUD from the bottom, and the support stability of the head-up display device is poor, and the HUD is prone to collision with other components after installation. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide a mounting structure for a vehicle head-up display device, which can meet the installation accuracy of the head-up display device and the steering mode of the entire vehicle to meet the effect of crush energy absorption.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A mounting structure for a vehicle head-up display device includes a mounting bracket, which is an integrated structure. The mounting bracket is provided with a support groove to support the head-up display device, the support groove is fitted with the lower half of the head-up display device, the mounting bracket is provided with a plurality of openings, the openings are connected with the support groove for signal transmission, the mounting bracket is provided with a connecting edge on the side of the support groove, the connecting edge can contact the head-up display device so that a fastener can connect the connecting edge to the head-up display device, one side of the mounting bracket can be connected to a front compartment of a cab, the other side of the mounting bracket is connected to a main beam, and the bottom of the mounting bracket can be connected to a steering column.

[0009] In the mounting structure for a vehicle head-up display device as described above, a plurality of through holes are arranged at the bottom of the mounting bracket to cooperate with the head-up display device so that the through holes of the mounting bracket can collapse and absorb energy when the vehicle collides. The arrangement of the through holes also optimizes the mounting bracket. When the vehicle collides, stress is preferentially concentrated at the through holes to cause fracture failure, thereby improving the crushing and energy absorption effect of the mounting bracket, thereby avoiding stress transmission to the steering column, and avoiding the steering wheel at the steering column from causing secondary damage to the driver.

[0010] In the mounting structure for a vehicle head-up display device as described above, the bottom of the mounting bracket is provided with two through holes, the two through holes are arranged at a distance, and the area of ​​one through hole is larger than the area of ​​the other through hole.

[0011] As described above, in a mounting structure for a vehicle head-up display device, the connecting edge includes a first connecting edge and a second connecting edge, the first connecting edge is connected to the upper side of the main beam, the position where the second connecting edge is connected to the main beam is lower than the position where the first connecting edge is connected to the main beam, the second connecting edge is bent, and the middle part of the second connecting edge is protruded upward, so that the first connecting edge and the second connecting edge can be effectively fitted with the head-up display device, ensuring the stable connection of the mounting bracket to the head-up display device.

[0012] In the mounting structure for a vehicle head-up display device as described above, a waist-shaped hole is provided on the second connecting edge, the waist-shaped hole is provided close to the main beam, and the waist-shaped hole is located above the vehicle air-conditioning mounting hole. The waist-shaped hole optimizes the second connecting edge and facilitates the staff to peek into the air-conditioning mounting hole below. On the instrument subassembly line, the staff can confirm whether there is a certain mounting point of the air-conditioning fastened, and confirm whether the head-up display device is completely fitted on the mounting surface of the instrument cross beam.

[0013] As described above, in a mounting structure for a vehicle head-up display device, a side of the mounting bracket used for connecting with the front compartment of the cab is provided with reinforcing ribs to improve the structural strength, the side of the mounting bracket close to the main beam is an inclined side, the inclined side of the mounting bracket is connected to the bottom of the mounting bracket at an obtuse angle, and one end of the inclined side is bent and arranged to be welded to the main beam.

[0014] As described above, in the mounting structure for a vehicle head-up display device, taking into account the bottom structure of the head-up display device, the bottom of the mounting bracket is connected to the side of the mounting bracket close to the front compartment of the cab at an obtuse angle, a column connecting bracket is welded to the bottom of the mounting bracket to connect to the steering column, and a notch is set in the middle of the inclined side of the mounting bracket, and the column connecting bracket is exposed from the notch.

[0015] As described above, a mounting structure for a vehicle head-up display device, the mounting bracket is used to set a front compartment connecting bracket on the side connected to the front compartment of the cab, the front compartment connecting bracket is set at least two places, the front compartment connecting bracket includes a door-type frame, a threaded hole is set in the middle of the door-type frame, support frames are respectively set on both sides of the door-type frame, and the two sides of the door-type frame and the support frames are respectively fixedly connected to the mounting bracket.

[0016] In a second aspect, the present invention further provides a vehicle instrument cross beam component, comprising the above-mentioned mounting structure for a vehicle head-up display device.

[0017] In a third aspect, the present invention further provides a method for installing a mounting structure for a vehicle head-up display device, comprising the following contents:

[0018] The mounting bracket is integrally manufactured, a support groove is formed during the manufacturing process of the mounting bracket, and a plurality of openings are formed by punching the mounting bracket;

[0019] Connect one side of the mounting bracket to the front compartment connecting bracket, and connect the other side of the mounting bracket to the main beam.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1) The present invention provides the above-mentioned mounting structure, and a supporting groove is provided on the mounting bracket. The supporting groove can support the head-up display device, and the supporting groove fits with the lower half of the head-up display device, thereby ensuring that the mounting bracket stably supports the head-up display device and avoids collision problems between the head-up display device and other components. Combined with the setting of the connecting edge, the head-up display device and the mounting bracket can be reliably connected. The integrated mounting bracket ensures the installation accuracy of the head-up display device. The mounting bracket can be connected to the front compartment of the cab and the steering column, so that the mounting bracket is connected to the front compartment of the cab, the steering column and the main beam, and can be connected as a unified whole, which is beneficial to improving the steering mode of the whole vehicle.

[0022] 2) In the present invention, a through hole is provided at the bottom of the mounting bracket, so that the HUD can be set through the through hole. In addition, the setting of the through hole can optimize the structure of the mounting bracket. When the vehicle collides, stress is concentrated at the through hole first to produce fracture failure, thereby improving the effect of the mounting bracket's collapse and energy absorption, thereby avoiding stress transmission to the steering column, avoiding the steering wheel at the steering column from causing secondary damage to the driver, and improving the safety performance of the vehicle. Like the opening, it also plays a role in signal transmission shielding, is beneficial to heat dissipation and plays a role in weight reduction.

[0023] 3) The mounting bracket structure of the present invention is reasonably arranged. The mounting bracket is provided with an inclined side, and a notch is provided on the inclined side. The pipe column connecting bracket can be exposed from the notch. The notch is also provided to prioritize stress concentration and produce fracture failure. The side bend setting of one side of the mounting bracket also optimizes the overall structure. Under the premise of meeting the modal requirements, it will prioritize collapse in the event of a collision to improve safety. Moreover, the inclined side bend is provided to be welded and connected to the main pipe beam, and then cooperates with the connection between the first connecting edge and the second connecting edge end and the main pipe beam, thereby ensuring the connection strength between the mounting bracket and the main pipe beam.

[0024] 4) In the present invention, a front compartment connecting bracket is arranged on one side of the mounting bracket for connection with the front compartment of the cab, the front compartment connecting bracket has a reasonable structure, and a column connecting bracket is arranged at the bottom of the mounting bracket to ensure smooth connection between the mounting bracket and the steering column. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 Schematic diagram of a HUD mounting bracket in the prior art.

[0027] Figure 2 It is a schematic diagram of the cooperation between a mounting structure for a vehicle head-up display device and a main pipe beam according to one or more embodiments of the present invention.

[0028] Figure 3 It is a schematic diagram of a mounting structure for a vehicle head-up display device according to one or more embodiments of the present invention.

[0029] Figure 4 1 is a top view of a mounting structure for a vehicle head-up display device according to one or more embodiments of the present invention.

[0030] Figure 5 It is a schematic diagram of a mounting structure for a vehicle head-up display device according to one or more embodiments of the present invention, in which a front compartment connecting bracket and a column connecting bracket are arranged.

[0031] Figure 6 The present invention is a steering mode simulation result when a mounting structure for a vehicle head-up display device is applied to a vehicle according to one or more embodiments of the present invention. Figure 1 .

[0032] Figure 7 The present invention is a steering mode simulation result when a mounting structure for a vehicle head-up display device is applied to a vehicle according to one or more embodiments of the present invention. Figure 2 .

[0033] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0034] Among them: 1. first mounting bar, 2. second mounting bar, 3. first U-shaped frame, 4. second U-shaped frame, 5. mounting part, 6. middle support frame, 7. mounting bracket, 8. front compartment connecting bracket, 9. main beam, 10. pipe column connecting bracket, 11. opening, 12. first connecting edge, 13. second connecting edge, 14. second through hole, 15. first through hole, 16. waist-shaped hole, 17. reinforcing rib, 18. supporting groove, 19. notch, 20. door frame, 21. supporting frame. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0037] As introduced in the background technology, the HUD mounting bracket in the prior art has the problem that it is not conducive to the steering mode of the whole vehicle and cannot stably support the head-up display device. In order to solve the above technical problems, the present invention proposes a mounting structure for a vehicle head-up display device.

[0038] Embodiment 1

[0039] In a typical embodiment of the present invention, reference is made to Figure 2As shown, a mounting structure for a vehicle head-up display device includes a mounting bracket 7, which is an integrated structure. The mounting bracket 7 is provided with a support groove to support the head-up display device, so that the mounting bracket as a whole is a box-type structure, and the support groove 18 is in contact with the lower half of the head-up display device. The mounting bracket 7 is provided with a plurality of openings 11, and the openings 11 are connected with the support groove 18 to facilitate signal transmission. The mounting bracket 7 is provided with a connecting edge on the side of the support groove 18, and the connecting edge can contact with the head-up display device so that the fastener can connect the connecting edge with the head-up display device. One side of the mounting bracket 7 can be connected to the front compartment of the cab, and the other side of the mounting bracket is connected to the main beam 9 in the instrument beam, and the bottom of the mounting bracket 7 can be connected to the steering column.

[0040] refer to Figure 3 and Figure 5 As shown, considering the bottom side structure of the head-up display device, the mounting bracket 7 includes a bottom of the mounting bracket, and the side of the mounting bracket 7 close to the main beam is a sloped side. The mounting bracket also includes a side wall, and the side wall connects the sloped side and the connection side of the mounting bracket with the front compartment of the cab. The opening 11 is provided at the bottom, the sloped side, the side wall and the connection side of the mounting bracket with the front compartment of the cab. The setting of the opening facilitates the anti-shielding effect of signal transmission when the head-up display device is working, is beneficial to heat dissipation and plays a role in weight reduction.

[0041] It is easy to understand that the inclined side of the mounting bracket 7 is connected to the bottom of the mounting bracket 7 at an obtuse angle, one end of the inclined side is bent upward to be welded to the main beam 9, and the bottom of the mounting bracket is also connected to the side of the mounting bracket close to the front compartment of the cab at an obtuse angle. A column connecting bracket 10 is welded to the bottom of the mounting bracket 7 to be connected to the steering column. A notch 19 is set in the middle of the inclined side of the mounting bracket, and the length of the notch 19 is smaller than the length of the inclined side. The notch has a set width, and the column connecting bracket is exposed from the notch. The width of the notch is smaller than the width of the column connecting bracket. The setting of the notch also prioritizes stress concentration to produce fracture failure, thereby improving safety.

[0042] Specifically, the column connecting bracket 10 includes a connecting bottom plate, the width of the connecting bottom plate is greater than the width of the notch, the connecting bottom plate is welded to the bottom of the mounting bracket, a connecting hole is arranged at the connecting bottom plate, and the connecting hole at the connecting bottom plate can be exposed from the notch at the inclined side of the mounting bracket, and two connecting ear plates are arranged on one side of the connecting bottom plate away from the main pipe beam, and the connection with the steering column is realized through the two connecting ear plates;

[0043] refer to Figure 5As shown, the mounting bracket 7 is used to set a front compartment connecting bracket on the side connected to the front compartment of the cab, and the front compartment connecting bracket 8 is set at two locations, and the two front compartment connecting brackets 8 are set at a distance, and the front compartment connecting bracket 8 includes a door frame 20, a threaded hole is set in the middle of the door frame 20, and support frames 21 are respectively set on both sides of the door frame 20, and the two sides of the door frame 20 and the support frames are respectively welded to the mounting bracket 7.

[0044] In some examples, both sides of the portal frame 20 and the support frame may be flat plates or inclined plates, and the bottom side of the portal frame and the bottom side of the support frame 21 may be bent to increase the contact area with the mounting bracket to ensure the connection strength.

[0045] It should be noted that, considering that a protruding block is provided on the bottom side of the HUD, a plurality of through holes are provided at the bottom of the mounting bracket 7, and the protruding block of the HUD is provided through the through holes. In addition, when a vehicle collides, the through holes of the mounting bracket collapse and absorb energy. The provision of the through holes also optimizes the mounting bracket. When a vehicle collides, stress is preferentially concentrated at the through holes to cause fracture failure, thereby improving the collapse and energy absorption effect of the mounting bracket, thereby avoiding stress transmission to the steering column, and avoiding the steering wheel at the steering column from causing secondary damage to the driver.

[0046] In this embodiment, reference Figure 4 As shown, two through holes are provided at the bottom of the mounting bracket 7, which also play a role in heat dissipation. The two through holes are set at a distance, wherein the area of ​​the first through hole 15, i.e., the through hole near the waist-shaped hole, is larger than the area of ​​the second through hole 14, and the two through holes are located on both sides of the column connection bracket;

[0047] In some other examples, two through holes are provided at the bottom of the mounting bracket 7 , and the two through holes are provided with a distance between them, and the area of ​​one of the through holes is larger than the area of ​​the other through hole.

[0048] It can be understood that a reinforcing rib 17 is provided on one side of the mounting bracket 7 for connection with the front compartment of the cab to improve the structural strength. The reinforcing rib 17 can be provided at two locations, and the two reinforcing ribs 17 are set at a distance. The reinforcing rib 17 can be a reinforcing plate, and the reinforcing rib 17 is integrally formed with the mounting bracket, or the reinforcing rib is welded to the outer side of the mounting bracket at a later stage.

[0049] In this embodiment, reference Figure 5As shown, the connecting edge of the mounting bracket 7 is connected to the side wall, and the connecting edge is formed by folding the top of the side wall. The connecting edge includes a first connecting edge 12 and a second connecting edge 13. The first connecting edge 12 is a flat plate, and the first connecting edge 12 is bent downward toward one side of the main beam. The first connecting edge is welded to the upper side of the main beam, and the position where the second connecting edge 13 is connected to the main beam is lower than the connection position of the first connecting edge with the main beam. The second connecting edge 13 is bent, and the middle part of the second connecting edge 13 is protruded upward, so that the first connecting edge 12 and the second connecting edge 13 can be effectively fitted with the head-up display device, thereby ensuring the stable connection of the mounting bracket to the head-up display device, and the bent second connecting edge 13 is optimized to facilitate priority collapse when the vehicle collides, thereby ensuring the safety of the vehicle.

[0050] In addition, a waist-shaped hole 16 is provided on the second connecting edge 13. The waist-shaped hole 16 is provided close to the main beam 9. The waist-shaped hole is located above the vehicle air-conditioning mounting hole. The waist-shaped hole optimizes the second connecting edge and allows the staff to peek into the air-conditioning mounting hole below. On the instrument subassembly line, the staff can confirm whether there is a certain installation point for fastening the air conditioner and whether the head-up display device is completely attached to the mounting surface of the instrument cross beam.

[0051] The integrated mounting bracket provided in this embodiment ensures the mounting accuracy of the head-up display device. The mounting bracket can be connected to the front compartment of the cab and the steering column, so that the mounting bracket is connected to the front compartment of the cab, the steering column and the main beam, and can be connected as a unified whole, which is conducive to improving the steering mode of the whole vehicle. Figure 6 and Figure 7 As shown, through existing software simulation analysis, using the installation structure provided in this embodiment, the vehicle's up and down steering mode is 42.5HZ, and the left and right steering mode is 40HZ, which is higher than the standard requirement of 35HZ; in addition, the mounting bracket is provided with a support groove, which can support the head-up display device, and the support groove is fitted with the lower half of the head-up display device, thereby ensuring that the mounting bracket stably supports the head-up display device and avoiding collision problems between the head-up display device and other components.

[0052] Embodiment 2

[0053] This embodiment also provides a vehicle instrument cross beam component, including a mounting structure for a vehicle head-up display device as described in Embodiment 1, that is, a mounting bracket is welded to the main beam in the vehicle instrument cross beam, so that the mounting bracket, the front compartment of the cab, the steering column and the main beam form a whole.

[0054] Embodiment 3

[0055] This embodiment also provides a method for installing a mounting structure for a vehicle head-up display device, including the following contents:

[0056] The mounting bracket is manufactured by an integrated mold forming method, so that the mounting bracket is an integrated component, a support groove is formed during the manufacturing process of the mounting bracket, and the mounting bracket is punched to form a plurality of openings;

[0057] A front compartment connecting bracket is welded on one side of the mounting bracket, a pipe column connecting bracket is arranged at the bottom of the mounting bracket, and the inclined side, the first connecting edge and the second connecting edge of the mounting bracket are welded and connected to the main pipe beam.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mounting structure for a vehicle head-up display device, characterized in that: The mounting bracket includes a mounting bracket, which is an integrated structure. The mounting bracket is provided with a support groove to support the head-up display device. The support groove is fitted with the lower half of the head-up display device. The mounting bracket is provided with multiple openings, which are connected with the support groove to facilitate signal transmission. The mounting bracket is provided with a connecting edge on the side of the support groove. The connecting edge can contact the head-up display device so that a fastener can connect the connecting edge to the head-up display device. One side of the mounting bracket can be connected to the front compartment of the cab, and the other side of the mounting bracket is connected to the main beam. The bottom of the mounting bracket can be connected to the steering column.

2. The mounting structure for a vehicle head-up display device according to claim 1, characterized in that: A plurality of through holes are arranged at the bottom of the mounting bracket to cooperate with the head-up display device, so that the through holes of the mounting bracket can collapse and absorb energy when the vehicle collides.

3. The mounting structure for a vehicle head-up display device according to claim 2, characterized in that: The bottom of the mounting bracket is provided with two through holes, the two through holes are arranged at a distance from each other, and the area of ​​one through hole is larger than the area of ​​the other through hole.

4. The mounting structure for a vehicle head-up display device according to claim 1, characterized in that: The connecting edge includes a first connecting edge and a second connecting edge, the first connecting edge is connected to the upper side of the main beam, the position where the second connecting edge is connected to the main beam is lower than the position where the first connecting edge is connected to the main beam, the second connecting edge is bent, and the middle part of the second connecting edge protrudes upward.

5. The mounting structure for a vehicle head-up display device according to claim 4, characterized in that: The second connecting edge is provided with a waist-shaped hole, the waist-shaped hole is arranged close to the main pipe beam, and the waist-shaped hole is located above the vehicle air conditioner installation hole.

6. The mounting structure for a vehicle head-up display device according to claim 1, characterized in that: The side of the mounting bracket used for connecting with the front compartment of the cab is provided with reinforcing ribs to improve the structural strength. The side of the mounting bracket close to the main beam is an inclined side. The inclined side of the mounting bracket is connected to the bottom of the mounting bracket at an obtuse angle. One end of the inclined side is bent and arranged to be welded to the main beam.

7. The mounting structure for a vehicle head-up display device according to claim 6, characterized in that: The bottom of the mounting bracket is also connected at an obtuse angle to the side of the mounting bracket close to the front compartment of the cab. A column connecting bracket is welded to the bottom of the mounting bracket to connect to the steering column. A notch is set in the middle of the inclined side of the mounting bracket, and the column connecting bracket is exposed from the notch.

8. The mounting structure for a vehicle head-up display device according to claim 1, characterized in that: The mounting bracket is used to set a front compartment connecting bracket on the side connected to the front compartment of the cab, and the front compartment connecting bracket is set at least two places. The front compartment connecting bracket includes a door-type frame, a threaded hole is set in the middle of the door-type frame, and support frames are respectively set on both sides of the door-type frame. The two sides of the door-type frame and the support frames are respectively fixedly connected to the mounting bracket.

9. A vehicle instrument cross beam component, characterized in that: A mounting structure for a vehicle head-up display device comprising any one of claims 1-8.

10. The method for installing a mounting structure for a vehicle head-up display device according to claim 8, characterized in that: It includes the following: The mounting bracket is integrally manufactured, a support groove is formed during the manufacturing process of the mounting bracket, and a plurality of openings are formed by punching the mounting bracket; Connect one side of the mounting bracket to the front compartment connecting bracket, and connect the other side of the mounting bracket to the main beam.

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