Instrument panel mounting bracket, steering supporting structure and vehicle
By designing the dashboard installation bracket, using the support arms and connectors to lock the preset position of the dashboard in three directions of the vehicle, the gap surface difference caused by the dashboard being separated from the preset position is solved, and the stability and connection strength of the dashboard are improved.
Patent Information
- Application Number
- CN202421984330.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-15
AI Technical Summary
The gap surface difference caused by the instrument panel leaving the preset position affects the aesthetics of the vehicle's internal space and the passenger's riding experience.
A dashboard mounting bracket is designed, including a bracket body and three support arms. The support arms extend in the Z, X and Y directions of the vehicle, and a connecting piece is provided on the support arms to connect to the dashboard to ensure the preset position of the instrument panel in three directions.
Effectively lock the instrument panel in the preset position to avoid displacement due to gravity or vibration, improve the connection strength and load transfer capability between the instrument panel and the installation bracket, and solve the problem of gap surface difference.
Smart Images

Figure CN223014741U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the technical field of vehicle parts, and particularly to an instrument panel mounting bracket, a steering support structure and a vehicle. Background Art
[0002] With the continuous development of automobiles, consumers' requirements for the interior styling of automobiles have increased year by year. Therefore, once the relevant structures inside the automobile are not assembled to the preset positions, it will affect the aesthetics of the interior space of the vehicle and the riding experience of passengers.
[0003] As shown in the Figure 1 attached figure, in order to avoid interference between the door and the instrument panel, a safety gap is usually provided between the door and the instrument panel. However, since the distance between the side of the instrument panel close to the driver's seat and the cross tube in the steering support structure is relatively far, that is, the support strength at this position is relatively weak, so this position is prone to collapse, which in turn leads to the problem of clearance surface difference between the instrument panel and the door. Summary of the Utility Model
[0004] In view of this, the embodiments of the present application provide an instrument panel mounting bracket, a steering support structure and a vehicle to solve the problem of clearance surface difference caused by the instrument panel deviating from the preset position.
[0005] In order to achieve the above object, the technical solution of the embodiments of the present application is realized as follows:
[0006] In a first aspect, the embodiments of the present application provide an instrument panel mounting bracket, including:
[0007] A bracket body and a first arm, a second arm and a third arm provided on the bracket body. The first arm and the second arm extend in two opposite directions along the Z direction of the vehicle, the third arm extends along the X direction of the vehicle. A first mounting hole is provided at the free end of the first arm, a second mounting hole is provided at the free end of the second arm, and a third mounting hole is provided at the free end of the third arm. The bracket body is adapted to be connected to the instrument panel through a plurality of connecting pieces passing through the first mounting hole, the second mounting hole (1021) and the third mounting hole.
[0008] The dashboard mounting bracket provided by the embodiment of the present application can stably lock the dashboard at a preset position in the vehicle Z direction and X direction by making the first arm and the second arm extend in two opposite directions along the vehicle Z direction, making the third arm extend along the vehicle X direction, and arranging connectors connected to the dashboard on the three arms, effectively solving the problem of the gap surface difference between the dashboard and the door caused by the displacement of the dashboard position. In addition, since connectors are provided on all three arms, not only can the connection strength between the dashboard and the dashboard mounting bracket be improved, but also the load can be effectively dispersed and transmitted, improving the stability and load-bearing capacity of the mounting bracket. Thus, by adopting the above-mentioned dashboard mounting bracket, the possibility of the dashboard being displaced due to its own gravity or external vibration can be effectively avoided.
[0009] In a possible implementation manner of the present application, transition arcs that are concave inward are formed at the joints of the first arm and the second arm with the third arm.
[0010] In a possible implementation manner of the present application, a cross-tube mounting portion is further provided on the bracket body, and the cross-tube mounting portion is disposed opposite to the third arm.
[0011] In a possible implementation manner of the present application, reinforcing ribs are provided on the surface of the bracket body, and one end of the reinforcing rib is connected to the cross-tube mounting portion.
[0012] In a second aspect, the embodiment of the present application provides a steering support structure, including:
[0013] A cross-tube, both ends of which are adapted to be connected to the vehicle frame main body;
[0014] At least one of the above-mentioned dashboard mounting brackets, and each bracket body is disposed on the cross-tube.
[0015] For the steering support structure provided by the embodiment of the present application, after installing at least one of the above-mentioned dashboard mounting brackets on the cross-tube, not only can the position of the dashboard in the vehicle Z direction and X direction be effectively limited, but also the support strength on the side of the dashboard far from the cross-tube can be indirectly enhanced, avoiding the situation of collapse. In addition, since the cross-tube in the steering support structure extends along the vehicle Y direction, by adjusting the position of the dashboard mounting bracket on the cross-tube, the position of the dashboard in the vehicle Y direction can be limited. Thus, by adopting the above-mentioned steering support structure, not only can the dashboard be accurately locked at the preset position, but also the problem of the gap surface difference between the dashboard and the door can be effectively prevented.
[0016] In a possible implementation manner of the present application, the number of the bracket bodies is two, and the two bracket bodies are respectively disposed at the ends of the cross-tube close to the vehicle frame main body.
[0017] In a third aspect, an embodiment of the present application provides a vehicle, including:
[0018] A frame body;
[0019] The above-mentioned steering support structure, with both ends of the cross tube respectively connected to the frame body;
[0020] An instrument panel, which is installed on the instrument panel mounting bracket through the connecting member.
[0021] For the vehicle provided by the embodiment of the present application, by setting the above-mentioned steering support structure on the frame body and installing the instrument panel on the instrument panel mounting bracket in the above-mentioned steering support structure, the position of the instrument panel can be locked in three directions (X direction / Y direction / Z direction) of the vehicle, reducing the probability of the instrument panel shifting in position during the subsequent use of the vehicle, and avoiding the problem of clearance surface difference between the instrument panel and the door.
[0022] In a possible implementation manner of the present application, the instrument panel mounting bracket has a first side surface and a second side surface arranged opposite to each other, and the first side surface is in contact with the instrument panel.
[0023] In a possible implementation manner of the present application, the connecting member includes a nut plate and a stud provided on the nut plate. The nut plate is attached to the second side surface and is connected to the instrument panel through a plurality of the studs respectively passing through the first mounting hole, the second mounting hole, and the third mounting hole.
[0024] In a possible implementation manner of the present application, flanges bent towards the second side surface are respectively provided on the circumferences of the first arm, the second arm, and the third arm. Description of the Drawings
[0025] Figure 1 It is a schematic structural diagram of a door and an instrument panel provided by an embodiment of the present application;
[0026] Figure 2 It is a schematic structural diagram of an instrument panel mounting bracket provided by an embodiment of the present application;
[0027] Figure 3 It is an assembly schematic diagram of the instrument panel mounting bracket and the cross tube provided by an embodiment of the present application;
[0028] Figure 4 It is a schematic structural diagram of a steering support structure provided by an embodiment of the present application;
[0029] Figure 5 It is an assembly schematic diagram of the instrument panel mounting bracket and the cross tube provided by an embodiment of the present application.
[0030] Reference Signs:
[0031] 1. Bracket body; 101. First arm; 1011. First mounting hole; 102. Second arm; 1021. Second mounting hole; 103. Third arm; 1031. Third mounting hole; 104. Transition arc; 105. Mounting part; 106. Reinforcing rib; 107. First side; 108. Second side; 109. Flange; 2. Connector; 201. Nut plate; 202. Stud
[0032] 100. Steering support structure; 1001. Instrument panel mounting bracket; 1002. Horizontal pipe
[0033] 200. Instrument panel; 300. Door Specific embodiments
[0034] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will further describe the specific technical solutions of the present application in detail with reference to the accompanying drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.
[0035] In the embodiments of the present application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.
[0036] In addition, in the embodiments of the present application, orientation terms such as "upper", "lower", "left" and "right" are defined relative to the orientation in which the components in the drawings are schematically placed. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, and they may change correspondingly according to the change of the orientation in which the components in the drawings are placed.
[0037] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" may be fixedly connected, may be detachably connected, or may be integrated; it may be directly connected, or may be indirectly connected through an intermediate medium.
[0038] In the embodiments of the present application, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising that element.
[0039] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.
[0040] In view of the problem of the gap surface difference caused by the instrument panel deviating from the preset position, the embodiments of the present application provide an instrument panel mounting bracket, a steering support structure and a vehicle.
[0041] The following is combined with Figures 1 to 5 , to describe the embodiments of the present application.
[0042] In a first aspect, as Figures 2 to 5 shown, the embodiments of the present application provide an instrument panel mounting bracket 1001, comprising: a bracket body 1 and a first arm 101, a second arm 102 and a third arm 103 provided on the bracket body 1. The first arm 101 and the second arm 102 extend in two opposite directions along the Z direction of the vehicle, the third arm 103 extends along the X direction of the vehicle. A first mounting hole 1011 is provided at the free end of the first arm 101, a second mounting hole 1021 is provided at the free end of the second arm 102, and a third mounting hole 1031 is provided at the free end of the third arm 103. The bracket body 1 is adapted to be connected to the instrument panel 200 through a plurality of connectors 2 passing through the first mounting hole 1011, the second mounting hole 1021 and the third mounting hole 1031.
[0043] It should be noted that in this embodiment, the Z direction of the vehicle refers to the height direction of the vehicle, and the X direction of the vehicle refers to the length direction of the vehicle. Among them, the directions shown in Figure 3 are used to represent the height direction and the length direction of the vehicle. In addition, the connection manner of the three connectors 2 to the first arm 101, the second arm 102 and the third arm 103 can be, but is not limited to, welding or bonding, as long as the instrument panel 200 can be fixed on the bracket body 1. The specific connection manner is not limited to the above-listed solutions. Secondly, as Figure 5As shown, the positions of the three connectors 2 on the first arm 101, the second arm 102, and the third arm 103 can be adjusted on-site during assembly using jigs according to actual assembly requirements. In this way, the versatility of the instrument panel mounting bracket 1001 can be improved, and problems such as extended assembly cycles and increased assembly costs caused by mold repair of the bracket can be avoided.
[0044] It should be added that the free ends of the first arm 101, the second arm 102, and the third arm 103 are the ends of the first arm 101, the second arm 102, and the third arm 103 that are far from the bracket body 1. In addition, the number of connectors 2 in this embodiment can be, but is not limited to, three, four, five, or six, and specific adjustments can be made according to actual assembly requirements. The present application does not make specific limitations in this regard.
[0045] The instrument panel mounting bracket 1001 provided by the embodiment of the present application can stably lock the instrument panel 200 at a preset position in the vehicle Z-direction and X-direction by extending the first arm 101 and the second arm 102 in two opposite directions along the vehicle Z-direction, extending the third arm 103 along the vehicle X-direction, and setting connectors 2 connected to the instrument panel 200 on the three arms, effectively solving the problem of the gap surface difference between the instrument panel 200 and the door 300 caused by the position offset of the instrument panel 200. In addition, since connectors 2 are provided on all three arms, not only can the connection strength between the instrument panel 200 and the instrument panel mounting bracket 1001 be improved, but also the load can be effectively dispersed and transmitted, improving the stability and load-bearing capacity of the mounting bracket. It can be seen that by adopting the above-mentioned instrument panel mounting bracket 1001, the possibility of the instrument panel 200 being displaced due to its own gravity or external vibration can be effectively avoided.
[0046] In some embodiments of the present application, such as Figure 2 and Figure 3 As shown, concave transition arcs 104 are formed at the joints of the first arm 101 and the second arm 102 with the third arm 103. Compared with right-angle connection, the concave transition arc 104 can smoothly transition the stress, making the stress distribution more uniform, thereby improving the load-bearing capacity and durability of the instrument panel mounting bracket 1001.
[0047] To improve the connection stability between the instrument panel mounting bracket 1001 and the cross tube 1002 in the steering support structure 100 during subsequent installation, in some embodiments of the present application, such as Figure 2 and Figure 3As shown, a horizontal pipe mounting portion 105 adapted to the shape of the horizontal pipe 1002 is further provided on the support body 1, and the horizontal pipe mounting portion 105 is disposed opposite to the third support arm 103. With such a setting, it is possible to ensure a tight fit between the support body 1 and the horizontal pipe 1002, reduce the possibility of displacement of the two when subjected to impact or vibration, that is, it is possible to prevent the position of the instrument panel 200 in the Y direction of the vehicle from changing.
[0048] It should be noted that in this embodiment, the Y direction of the vehicle refers to the width direction of the vehicle, and at the same time, the direction shown in Figure 3 is used to represent the width direction of the vehicle.
[0049] In order to improve the structural strength of the instrument panel mounting bracket 1001 itself, as Figure 2 and Figure 3 shown, in some embodiments of the present application, the first support arm 101, the second support arm 102, and the third support arm 103 are integrally formed with the support body 1, and a reinforcing rib 106 connected to the horizontal pipe mounting portion 105 is provided on the surface of the support body 1.
[0050] Second, as Figure 3 and Figure 4 shown, an embodiment of the present application further provides a steering support structure 100, including: a horizontal pipe 1002 and an instrument panel mounting bracket 1001. Specifically, both ends of the horizontal pipe 1002 are adapted to be connected to the vehicle frame body; the support body 1 in at least one of the above-mentioned instrument panel mounting brackets 1001 is disposed on the horizontal pipe 1002.
[0051] After installing at least one of the above-mentioned instrument panel mounting brackets 1001 on the horizontal pipe 1002, the steering support structure 100 provided by the embodiment of the present application can not only effectively limit the position of the instrument panel 200 in the Z direction and the X direction of the vehicle, but also indirectly enhance the support strength for the side of the instrument panel 200 away from the horizontal pipe 1002, and avoid the situation of collapse. In addition, since the horizontal pipe 1002 in the steering support structure 100 extends along the Y direction of the vehicle, the position of the instrument panel 200 in the Y direction of the vehicle can be limited by adjusting the position of the instrument panel mounting bracket 1001 on the horizontal pipe 1002. It can be seen that by adopting the above-mentioned steering support structure 100, not only can the instrument panel 200 be accurately locked at the preset position, but also the problem of clearance surface difference between the instrument panel 200 and the vehicle door 300 can be effectively prevented.
[0052] In some embodiments of the present application, as Figure 4As shown, the number of the bracket bodies 1 is two, and the two bracket bodies 1 are respectively arranged at the end of the cross tube 1002 close to the vehicle frame body. It can be understood that when assembling the instrument panel 200 through the two bracket bodies, on the one hand, the two ends of the instrument panel 200 close to the vehicle door 300 can be evenly stressed, avoiding deformation of the instrument panel 200; on the other hand, the two ends of the instrument panel 200 close to the vehicle door 300 can be locked at the preset positions, ensuring that there is no problem of clearance surface difference between the instrument panel 200 and the left and right vehicle doors 300.
[0053] In order to provide sufficient supporting force for the side of the instrument panel 200 far from the cross tube 1002, as Figures 2 to 4 shown, in some embodiments of the present application, the third mounting hole 1031 on the third arm 103 is located at the end of the third arm 103 far from the vehicle steering support structure 100. With such a setting, on the one hand, the instrument panel 200 can be firmly connected to the third arm 103, ensuring that the side of the instrument panel 200 far from the cross tube 1002 can obtain effective support; on the other hand, the position of the instrument panel 200 in the vehicle X direction can be locked, avoiding its deviation from the preset position.
[0054] Thirdly, as Figure 1 and Figure 4 shown, the embodiments of the present application also provide a vehicle, including: a vehicle frame body, the above-mentioned steering support structure 100 and the instrument panel 200. Specifically, the two ends of the cross tube 1002 in the above-mentioned steering support structure 100 are respectively connected to the vehicle frame body; the instrument panel 200 is installed on the instrument panel mounting bracket 1001 through the connecting piece 2.
[0055] For the vehicle provided by the embodiments of the present application, by arranging the above-mentioned steering support structure 100 on the vehicle frame body and installing the instrument panel 200 on the instrument panel mounting bracket 1001 in the above-mentioned steering support structure 100, the position of the instrument panel 200 can be locked in three directions (X direction / Y direction / Z direction) of the vehicle, reducing the probability of the instrument panel 200 shifting in position during the subsequent use of the vehicle, and avoiding the problem of clearance surface difference between the instrument panel 200 and the door 300.
[0056] It should be noted that the vehicle in the present application may refer to large vehicles, small vehicles, special vehicles, etc. Exemplarily, classified by vehicle type, the vehicle in the present application may be a sedan model, an off-road vehicle model, a multi-purpose vehicle (MPV) model or other vehicle models. For a vehicle, generally, wheels, a power source, and a transmission system arranged between the wheels and the power source are provided. The transmission system can transmit the power provided by the power source to the wheels, making the wheels rotate, so as to drive the vehicle to travel.
[0057] It should be noted that in the embodiments of the present application, the type of the power source of the vehicle is not limited. Exemplarily, for a fuel vehicle, the power source may refer to a fuel engine such as a gasoline engine or a diesel engine; for an electric vehicle, the power source may refer to an electric motor; for a hybrid vehicle, the power source may refer to an engine or an electric motor; for a vehicle powered by other means, the power source may refer to a device that generates power.
[0058] In some embodiments of the present application, such as Figure 2 and Figure 3 shown, the instrument panel mounting bracket 1001 has a first side surface 107 and a second side surface 108 which are oppositely arranged. The first side surface 107 is in contact with the instrument panel 200, which can improve the connection stability after the instrument panel 200 and the instrument panel mounting bracket 1001 are installed. This stability helps to reduce loosening or displacement caused by vibration, bump or other external forces, and ensures that the instrument panel 200 and the components mounted thereon are not damaged. It can be understood that the first side surface 107 is the side of the instrument panel mounting bracket 1001 close to the vehicle door.
[0059] Since the instrument panel 200 needs to abut against the first side surface 107 of the instrument panel mounting bracket 1001, in order to avoid affecting the fitting degree between the instrument panel 200 and the instrument panel mounting bracket 1001 due to the connecting member 2 on the bracket body. In some embodiments of the present application, such as Figure 2 and Figure 3 shown, the connecting member 2 includes a nut plate 201 and a stud 202 provided on the nut plate 201. The nut plate 201 is attached to the second side surface 108 and is connected to the instrument panel 200 through a plurality of studs 202 respectively passing through the first mounting hole 1011, the second mounting hole 1021 and the third mounting hole 1031. In addition, by providing the stud 202 on the nut plate 201 and allowing the stud 202 to pass through the corresponding mounting hole, the staff can align the positioning hole on the instrument panel 200 with the corresponding mounting hole by using the stud 202 in a relatively short time, improving the efficiency of installation positioning. Secondly, after the stud 202 is passed through the positioning hole of the instrument panel 200, the self-weight of the instrument panel 200 will be dispersed to the stud 202, so the labor intensity of the staff can be reduced.
[0060] Furthermore, to avoid excessive interference between the studs 202 and the instrument panel 200 during installation, studs 202 can be first installed on some of the nut plates 201. In this way, on the one hand, the probability of damage to the instrument panel 200 or the studs 202 caused by interference between the studs 202 and the instrument panel 200 during the assembly process can be reduced; on the other hand, the self-weight of the instrument panel 200 can be evenly distributed to multiple studs 202, reducing the probability of damage to a single bolt. In addition, after passing multiple studs 202 through the corresponding positioning holes on the instrument panel 200, rotation of the instrument panel 200 during installation can be avoided, reducing the assembly difficulty and improving the efficiency of installation and positioning. Further, keeping the studs 202 perpendicular to the nut plates 201 can not only reduce the assembly difficulty between the studs 202 and the nut plates 201, but also evenly distribute the force at the connection between the studs 202 and the nut plates 201, avoiding stress concentration.
[0061] It can be understood that after passing the studs 202 through the corresponding positioning holes on the instrument panel 200, fasteners such as nuts or bolts that are adapted to the studs 202 need to be selected to connect with the studs 202, so as to ensure that the instrument panel 200 can be stably connected to the instrument panel mounting bracket 1001.
[0062] In some embodiments of the present application, as Figure 2 and Figure 3 shown, flanges 109 that are bent toward the second side surface 108 are respectively provided on the circumferences of the first arm 101, the second arm 102, and the third arm 103. With such a setting, the structural strength and rigidity of the arms can be improved, indirectly improving the stability and reliability of the entire instrument panel mounting bracket 1001.
[0063] The serial numbers of the embodiments of the present application above are only for description and do not represent the superiority or inferiority of the embodiments. The above are only the preferred embodiments of the present application, and thus do not limit the patent scope of the present application. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.
Claims
1. A dashboard mounting bracket, characterized in that: include: A bracket body (1) and a first arm (101), a second arm (102) and a third arm (103) arranged on the bracket body (1); the first arm (101) and the second arm (102) extend in two opposite directions along the Z direction of a vehicle; the third arm (103) extends along the X direction of the vehicle; a first mounting hole (1011) is provided at the free end of the first arm (101); a second mounting hole (1021) is provided at the free end of the second arm (102); a third mounting hole (1031) is provided at the free end of the third arm (103); the bracket body (1) is suitable for being connected to an instrument panel (200) by passing through a plurality of connecting members (2) arranged in the first mounting hole (1011), the second mounting hole (1021) and the third mounting hole (1031).
2. The instrument panel mounting bracket according to claim 1, characterized in that: The connections between the first support arm (101), the second support arm (102) and the third support arm (103) all form an inwardly concave transition arc (104).
3. The instrument panel mounting bracket according to claim 1, characterized in that: The support body (1) is also provided with a transverse tube mounting portion (105), and the transverse tube mounting portion (105) is arranged opposite to the third support arm (103).
4. The instrument panel mounting bracket according to claim 3, characterized in that: A reinforcing rib (106) is provided on the surface of the bracket body (1), and one end of the reinforcing rib (106) is connected to the cross tube mounting portion (105).
5. A steering support structure, characterized in that: include: A transverse tube (1002), both ends of which are suitable for connection with the frame body of the vehicle; At least one instrument panel mounting bracket (1001) according to any one of claims 1 to 4, each bracket body (1) being arranged on the cross tube (1002).
6. The steering support structure according to claim 5, characterized in that: The number of the bracket bodies (1) is two, and the two bracket bodies (1) are respectively arranged at the end of the cross tube (1002) close to the frame body.
7. A vehicle, characterized in that: include: Frame body; The steering support structure (100) according to claim 5 or 6, wherein both ends of the cross tube (1002) are respectively connected to the frame body; The instrument panel (200) is mounted on the instrument panel mounting bracket (1001) via the connecting member (2).
8. The vehicle according to claim 7, characterized in that The instrument panel mounting bracket (1001) has a first side surface (107) and a second side surface (108) that are arranged opposite to each other, and the first side surface (107) is in contact with the instrument panel (200).
9. The vehicle according to claim 8, characterized in that The connecting member (2) comprises a nut plate (201) and a stud (202) arranged on the nut plate (201); the nut plate (201) is attached to the second side surface (108) and connected to the instrument panel (200) via a plurality of studs (202) respectively passing through the first mounting hole (1011), the second mounting hole (1021) and the third mounting hole (1031).
10. The vehicle according to claim 8, characterized in that The first support arm (101), the second support arm (102) and the third support arm (103) are respectively provided with flanges (109) bent toward the second side surface (108) on their circumferential sides.