Support mechanism for improving dynamic stiffness of mounting point of rear auxiliary frame of vehicle body and auxiliary frame

Abstract

The utility model provides a support mechanism for improving the dynamic stiffness of a mounting point of a rear auxiliary frame of a vehicle body and the auxiliary frame. The support mechanism comprises a rear longitudinal beam part, a support part, a connecting part and a fixing part, the bracket part is arranged on one side of the rear longitudinal beam part along the radial direction of the rear longitudinal beam part, so that the rear longitudinal beam part is divided into independent mounting parts for mounting other parts; the connecting part penetrates through the rear longitudinal beam part and is fixedly connected with the bracket part on the rear longitudinal beam part; the fixing part is arranged on the other side of the rear longitudinal beam part and located on the opposite side of the support part, and the connecting part is arranged on the fixing part in a pressed mode and penetrates through the rear longitudinal beam part. Through the radial arrangement, the fixing area of the support part and the connecting part and the fixing area of the fixing part and the connecting part can be increased, so that the connecting stability between the connecting part and peripheral components is enhanced, and compared with the axial arrangement, the dynamic stiffness of the mounting point positions of the support part and the fixing part which are arranged in the radial direction is obviously improved; and vibration of the rear auxiliary frame transmitted to the vehicle body is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile dynamic stiffness brackets, and particularly relates to a bracket mechanism and a subframe for improving the dynamic stiffness of a rear subframe installation point of a vehicle body. Background Art

[0002] With the development of the automobile industry, the NVH (noise, vibration, harshness) performance of automobiles has become one of the important factors that affect users' purchase of automobiles. NVH is a system problem of "excitation → transmission → response". All three links are indispensable. Dynamic stiffness is an important parameter control indicator in the transmission link. When the excitation force cannot be reduced, the enhancement of dynamic stiffness is a very important measure. It can not only reduce vibration transmission and improve NVH performance, but also improve ride comfort and fatigue life of body structural parts caused by insufficient dynamic stiffness. However, the dynamic stiffness arrangement of the existing body and rear subframe mounting points is not simple and reasonable enough, so that the vibration of the rear subframe is transmitted to the body, resulting in low NVH performance. Utility Model Content

[0003] In view of the above problems, the utility model proposes a bracket mechanism for improving the inching stiffness of the rear subframe of the vehicle body, comprising:

[0004] Rear longitudinal beam;

[0005] A bracket portion is arranged on one side of the rear longitudinal beam portion along the radial direction of the rear longitudinal beam portion so that the rear longitudinal beam portion is divided into independent mounting portions for mounting other components;

[0006] A connecting portion passing through the rear longitudinal beam portion and fixedly connected to the bracket portion on the rear longitudinal beam portion;

[0007] The fixing portion is arranged on the other side of the rear longitudinal beam portion, the fixing portion is located on the opposite side of the bracket portion, and the connecting portion is pressed on the fixing portion and passes through the rear longitudinal beam portion.

[0008] Optionally, a first mounting groove is provided on the front side of the rear longitudinal beam portion, the bracket portion is arranged in the first mounting groove along the radial direction of the rear longitudinal beam portion, and the connecting portion passes through the other side of the bracket portion into the first mounting groove to be fixedly connected to the bracket portion.

[0009] Optionally, a fixing groove is provided on the bracket portion, and the connecting portion passes through the first installation groove and cooperates with the fixing groove.

[0010] Optionally, a first fixing surface, a second fixing surface and a third fixing surface are provided on the bracket portion, the first fixing surface is located in the fixing groove to be fixedly connected to the connecting portion, the second fixing surface is relatively perpendicular to the first fixing surface to be fixedly connected to the plane of the rear longitudinal beam portion, and the third fixing surface is located on one side of the bracket portion to be fixedly connected to the inner wall of the first mounting groove.

[0011] Optionally, a second mounting groove is provided on the back side of the rear longitudinal beam portion, and the fixing portion is arranged along the radial direction of the rear longitudinal beam portion to separate the second mounting groove.

[0012] Optionally, the rear longitudinal beam portion and the bracket portion are connected by welding points.

[0013] Optionally, the bracket portion and the connecting portion are connected by welding.

[0014] Optionally, the rear longitudinal beam portion and the fixing portion are connected by welding points.

[0015] Optionally, the connecting portion is a stud.

[0016] The utility model also provides a sub-frame, which comprises a bracket mechanism for improving the inching rigidity of the sub-frame installation at the rear of the vehicle body.

[0017] The utility model provides a bracket mechanism for improving the dynamic stiffness of the mounting point of the rear subframe of the vehicle body, wherein the bracket portion and the fixing portion are radially arranged on opposite sides of the rear longitudinal beam portion. The radial arrangement can increase the fixing areas of the bracket portion, the fixing portion and the connecting portion respectively, thereby strengthening the connection stability between the connecting portion and the surrounding components. Moreover, compared with the axial arrangement, the radially arranged bracket portion and the fixing portion have significantly improved mounting point dynamic stiffness, thereby reducing the transmission of vibration of the rear subframe to the vehicle body. Furthermore, the bracket portion and the fixing portion can form a partition on the rear longitudinal beam portion, thereby improving the stability of the rear longitudinal beam portion. In addition, the various arrangements of the mechanism are simple and reasonable.

[0018] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A front schematic diagram of a bracket mechanism for improving the inching stiffness of the rear sub-frame of the vehicle body in an embodiment of the utility model is shown;

[0021] Figure 2 A schematic diagram of the back side of the bracket mechanism for improving the inching stiffness of the rear sub-frame of the vehicle body in the embodiment of the utility model is shown;

[0022] Figure 3 A schematic diagram of the connection portion of a bracket mechanism for improving the inching stiffness of the rear sub-frame of the vehicle body in an embodiment of the utility model is shown.

[0023] In the figure, 1-bracket portion, 2-connecting portion, 3-rear longitudinal beam portion, 4-fixing portion, 31-first mounting groove, 11-fixing groove, 12-first fixing surface, 13-second fixing surface, 14-third fixing surface, 32-second mounting groove. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figure 1 As shown, a bracket mechanism for improving the mounting point dynamic stiffness of the rear subframe of the vehicle body comprises: a rear longitudinal beam portion 3, a bracket portion 1, a connecting portion 2 and a fixing portion 4, wherein the bracket portion 1 is arranged on one side of the rear longitudinal beam portion 3 along the radial direction of the rear longitudinal beam portion 3 so that the rear longitudinal beam portion 3 is divided into independent mounting portions for mounting other components, the connecting portion 2 passes through the rear longitudinal beam portion 3 and is fixedly connected to the bracket portion 1 on the rear longitudinal beam portion 3, the fixing portion 4 is arranged on the other side of the rear longitudinal beam portion 3, the fixing portion 4 is located on the opposite side of the bracket portion 1, and the connecting portion 2 is pressed on the fixing portion 4 and passes through the rear longitudinal beam portion 3. The bracket mechanism of the present application has a simple structure and a reasonable arrangement. Due to the radial arrangement of the bracket portion 1 and the fixing portion 4, the fixing area between each component can be increased, the mounting point dynamic stiffness of the vehicle body and the rear subframe can be effectively improved, the vibration transmission of the rear subframe to the vehicle body can be reduced, and the NVH performance of the vehicle can be improved to strengthen the bracket structure of the mounting point of the rear subframe on the vehicle body side.

[0026] In one embodiment, a first mounting groove 31 is provided on the front side of the rear longitudinal beam portion 3, the bracket portion 1 is arranged in the first mounting groove 31 along the radial direction of the rear longitudinal beam portion 3, and the connecting portion 2 passes through the first mounting groove 31 from the other side of the bracket portion 1 and is fixedly connected to the bracket portion 1. Since the bracket portion 1 is arranged in the first mounting groove 31 along the radial direction of the rear longitudinal beam portion 3, the structure between the longitudinal beam portion and the first mounting groove 31 is more stable, and the fixing area between the connecting portion 2 and the bracket portion 1 and the fixing portion 4 is increased, thereby improving the dynamic stiffness of the mounting point.

[0027] In one embodiment, a fixing groove 11 is provided on the bracket portion 1, and the connecting portion 2 passes through the first mounting groove 31 and cooperates with the fixing groove 11. The fixing groove 11 can cooperate and fix with the bracket portion 1, so that the fixation between them is tighter, and the fixing area between them is indirectly increased, thereby increasing the fixing strength.

[0028] like Figure 3 As shown, in one embodiment, a first fixing surface 12, a second fixing surface 13 and a third fixing surface 14 are provided on the bracket portion 1, the first fixing surface 12 is located in the fixing groove 11 to be fixedly connected with the connecting portion 2, the second fixing surface 13 is relatively perpendicular to the first fixing surface 12 to be fixedly connected with the plane of the rear longitudinal beam portion 3, and the third fixing surface 14 is located on one side of the bracket portion 1 to be fixedly connected with the inner wall of the first mounting groove 31. By fixing the bracket portion 1 and the connecting portion 2 with each fixing surface, the fixing area between the components is increased, thereby increasing the fixing strength between the rear longitudinal beam portion 3 and the bracket portion 1, supporting the local structure of the rear sub-frame mounting point, and thus effectively improving the dynamic stiffness of the rear sub-frame mounting point on the vehicle body side, especially in the Z-direction dynamic stiffness.

[0029] like Figure 2 As shown, in one embodiment, a second mounting groove 32 is provided on the back of the rear longitudinal beam 3, and the fixing portion 4 is arranged along the radial direction of the rear longitudinal beam 3 to partition the second mounting groove 32. According to the vibration transmission path, for the dynamic stiffness of the rear longitudinal beam 3 installation point, the Z-direction dynamic stiffness index is more important; by radially arranging the rear sub-frame fixing portion 4, on the one hand, the fixing surface between the fixing portion 4 and the rear longitudinal beam 3 installation connection portion 2 is increased, and on the other hand, a partition is formed between the radially arranged fixing portion 4 and the rear longitudinal beam 3, supporting the local structure of the installation point of the rear longitudinal beam 3, thereby effectively improving the dynamic stiffness of the rear sub-frame installation point on the vehicle body side, especially in the Z-direction dynamic stiffness.

[0030] In one embodiment, the rear longitudinal beam portion 3 and the bracket portion 1 are connected by welding points. It should be noted that the welding point connection between the rear longitudinal beam portion 3 and the bracket portion 1 is achieved by welding with the second fixing surface 13 and the third fixing surface 14 on the bracket portion 1, thereby increasing the welding area and making the fixing structure between the rear longitudinal beam portion 3 and the bracket portion 1 more stable. In addition, the bracket portion 1 and the connecting portion 2 are connected by welding. Specifically, the first fixing surface 12 in the fixing groove 11 is welded to the connecting portion 2, which can also improve the structural stability therebetween.

[0031] In one embodiment, the rear longitudinal beam portion 3 and the fixing portion 4 are connected by welding points. It should be noted that the arrangement of the bracket portion 1 and the fixing portion 4 must satisfy the convenience of welding between the bracket welding surface and the rear longitudinal beam portion 3. The sub-frame mounting connection portion 2 and the bracket portion 1 are connected by welding to maintain verticality with the longitudinal beam. The arrangement requirements of the bracket portion 1 are relatively few, which effectively increases the feasibility of the arrangement. In addition, the radial cross-section of the bracket portion 1 and the fixing portion 4 is smaller than the axial cross-section. Under the condition of the same material thickness, the structure with a smaller design area will be lighter. Therefore, the radially arranged bracket portion 1 is lighter than the axially arranged bracket (or the longitudinally arranged bracket portion 1 is lighter than the transversely arranged bracket), which effectively reduces the cost of materials.

[0032] In one embodiment, the connection part 2 is a stud. It should be noted that the main purpose of the bracket part 1 is to form a partition on the rear longitudinal beam part 3 on the one hand, and to increase the contact surface between the rear subframe mounting studs and the rear longitudinal beam part 3 on the other hand, so there is less demand for the bracket part 1, the bracket part 1 is simply designed, and the feasibility of the process is effectively improved.

[0033] The utility model also provides a sub-frame, including a bracket mechanism for improving the stiffness of the sub-frame installation point at the rear of the vehicle body. By changing the installation position of the bracket mechanism at the sub-frame installation point at the rear of the vehicle body and changing its own structure, the stiffness of the mechanism is improved, that is, the overall stiffness of the sub-frame is improved.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bracket mechanism for improving the inching stiffness of the rear subframe of a vehicle body, characterized in that: include: rear longitudinal beam portion (3); A bracket portion (1) is arranged on one side of the rear longitudinal beam portion (3) along the radial direction of the rear longitudinal beam portion (3), so that the rear longitudinal beam portion (3) is divided into independent mounting portions for mounting other components; A connecting portion (2) passes through the rear longitudinal beam portion (3) and is fixedly connected to the bracket portion (1) on the rear longitudinal beam portion (3); A fixing portion (4), wherein the fixing portion (4) is arranged on the other side of the rear longitudinal beam portion (3), the fixing portion (4) is located on the opposite side of the bracket portion (1), and the connecting portion (2) is pressed onto the fixing portion (4) and passes through the rear longitudinal beam portion (3).

2. The bracket mechanism for improving the inching stiffness of the rear subframe of the vehicle body according to claim 1, characterized in that: A first mounting groove (31) is provided on the front side of the rear longitudinal beam portion (3); the bracket portion (1) is arranged in the first mounting groove (31) along the radial direction of the rear longitudinal beam portion (3); and the connecting portion (2) passes through the first mounting groove (31) from the other side of the bracket portion (1) to be fixedly connected to the bracket portion (1).

3. The bracket mechanism for improving the inching stiffness of the rear subframe of the vehicle body according to claim 2, characterized in that: A fixing groove (11) is provided on the bracket portion (1), and the connecting portion (2) passes through the first installation groove (31) and cooperates with the fixing groove (11).

4. The bracket mechanism for improving the inching stiffness of the rear subframe of the vehicle body according to claim 3, characterized in that: The bracket portion (1) is provided with a first fixing surface (12), a second fixing surface (13) and a third fixing surface (14); the first fixing surface (12) is located in the fixing groove (11) to be fixedly connected to the connecting portion (2); the second fixing surface (13) is relatively perpendicular to the first fixing surface (12) to be fixedly connected to the plane of the rear longitudinal beam portion (3); and the third fixing surface (14) is located on one side of the bracket portion (1) to be fixedly connected to the inner wall of the first mounting groove (31).

5. The bracket mechanism for improving the inching stiffness of the rear subframe of the vehicle body according to claim 1, characterized in that: A second mounting groove (32) is provided on the back side of the rear longitudinal beam portion (3), and the fixing portion (4) is arranged along the radial direction of the rear longitudinal beam portion (3) to separate the second mounting groove (32).

6. The bracket mechanism for improving the inching stiffness of the rear subframe of the vehicle body according to claim 1, characterized in that: The rear longitudinal beam portion (3) and the bracket portion (1) are connected by welding points.

7. The bracket mechanism for improving the inching stiffness of the rear subframe of the vehicle body according to claim 1, characterized in that: The bracket part (1) and the connecting part (2) are connected by welding.

8. The bracket mechanism for improving the inching stiffness of the rear subframe of the vehicle body according to claim 1, characterized in that: The rear longitudinal beam portion (3) and the fixing portion (4) are connected by welding points.

9. The bracket mechanism for improving the inching stiffness of the rear subframe of the vehicle body according to claim 1, characterized in that: The connecting portion (2) is a stud.

10. A subframe, characterized in that: The invention comprises a bracket mechanism for improving the inching stiffness of the rear subframe of the vehicle body as described in any one of claims 1 to 9.

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