阅读说明：本技术 副车架安装结构 (Auxiliary frame mounting structure ) 是由 柳世浩 金容圭 宋时哲 姜承玟 朴成植 崔锡镐 金苔显 南基城 李民帝 朴相彦 于 2018-11-16 设计创作，主要内容包括：本发明提供了一种副车架安装结构。具体地,所述副车架安装结构包括：外管,其安装在车身上；以及内管,其插入并且联接到所述外管并且当预定大小或更大的冲击载荷传递到所述内管时,所述内管从外管脱离。防转动结构防止内管与外管之间的相对转动。副车架紧固至内管以通过外管支撑车身,从而通过副车架稳定地支撑车身,并且在碰撞期间将副车架从车身脱离。(The invention provides an auxiliary frame mounting structure. Specifically, the subframe mounting structure includes: an outer tube mounted on the vehicle body; and an inner pipe inserted and coupled to the outer pipe and disengaged from the outer pipe when an impact load of a predetermined magnitude or more is transmitted to the inner pipe. The anti-rotation structure prevents relative rotation between the inner tube and the outer tube. The subframe is fastened to the inner tube to support the vehicle body through the outer tube, thereby stably supporting the vehicle body through the subframe and disengaging the subframe from the vehicle body during a collision.)

1. A subframe mounting structure comprising:

an outer tube mounted on the vehicle body; and

an inner pipe inserted and coupled to the outer pipe and disengaged from the outer pipe when an impact load of a predetermined magnitude or more is transmitted to the inner pipe;

wherein a subframe is fastened to the inner pipe to support a vehicle body through the outer pipe.

2. The subframe mounting structure according to claim 1, further comprising:

and an anti-rotation structure which prevents relative rotation between the inner tube and the outer tube.

3. The subframe mounting structure according to claim 2, wherein the rotation preventing structure includes:

a rotation prevention coupling part having a polygonal shape formed on an inner circumferential surface of the outer tube; and

a nut portion formed in a polygonal shape on an outer circumferential surface of the inner pipe to be coupled to the rotation preventing coupling portion.

4. The subframe mounting structure of claim 3, wherein the outer tube comprises:

a pipe body in which a hole penetrating from a first side of the pipe body to a second side of the pipe body is formed;

wherein the rotation prevention coupling part is formed on an inner circumferential surface of the pipe body.

5. The subframe mounting structure of claim 3, wherein the inner tube comprises:

a pipe body in which a hole penetrating from a first side of the pipe body to a second side of the pipe body is formed; and

a nut portion formed on an outer circumferential surface of the pipe body and formed in a polygonal shape corresponding to the rotation preventing coupling portion of the outer pipe.

6. The subframe mounting structure of claim 4, wherein the polygonal shape of each of the outer tube and the inner tube is a hexagonal shape.

7. The subframe mounting structure of claim 3, further comprising:

a critical load disengaging structure that disengages the inner pipe from the outer pipe when a load of a predetermined magnitude or greater is applied to the inner pipe.

8. The subframe mounting structure of claim 7, wherein the critical load decoupling structure comprises:

an inclined support formed on the outer tube; and

and an engaging portion formed on the inner tube to be forcibly expanded to be adjacent to the inclined support portion.

9. The subframe mounting structure of claim 8, wherein the outer tube comprises:

a pipe body in which a hole penetrating from a first side of the pipe body to a second side of the pipe body is formed;

wherein the inclined support forming part is arranged at the upper part of the pipe body;

the rotation prevention coupling part is formed at a lower portion of the tube body.

10. The subframe mounting structure of claim 8, wherein the inner tube comprises:

a tube body in which a hole penetrating from a first side of the tube body to a second side of the tube body is formed,

wherein the nut part is formed at a lower portion of the pipe body;

the engaging portion is formed at an upper portion of the pipe body.

11. The subframe mounting structure of claim 1, wherein an outer peripheral surface of the inner tube is provided with a polymer coating.

12. The subframe mounting structure according to claim 11, wherein a notch groove or one or more notch portions is formed in an outer surface of the nut portion.

13. The subframe mounting structure according to claim 11, wherein a thickness of the engaging portion is smaller than a thickness of the nut portion.

14. The subframe mounting structure according to claim 1, wherein an assembly bolt that passes through a subframe is fastened to the inner tube.

Technical Field

The present invention relates to a subframe mounting structure, and more particularly, to a subframe mounting structure that allows a subframe to be separated from a vehicle body when an impact load of a predetermined magnitude or more is transmitted to the subframe.

Background

Generally, a subframe of a vehicle is mounted on a lower portion of a vehicle body, specifically, a lower portion of a side member of the vehicle body to support an engine, a transmission, and the like, and a chassis component is mounted on the subframe and supported by the subframe. When an impact load is transmitted from the vehicle body to the subframe during a vehicle collision, the subframe is appropriately detached from the vehicle body to prevent the engine, transmission, etc. from being pushed toward the interior of the vehicle, thereby improving the collision safety of vehicle passengers.

According to the prior art, when the subframe is mounted on the vehicle body and an impact load of a predetermined magnitude or more is transmitted to the subframe mounting bushing, the subframe is separated from the vehicle body at the time of the bushing detachment, or when an impact load of a predetermined magnitude or more is transmitted to the subframe mounting bolt, the subframe is separated from the vehicle body at the time of the detachment of the portion of the subframe mounting bolt mounted on the vehicle body from the vehicle body. However, the detachment structure of the bushing or the detachment structure of the subframe mounting bolt according to the prior art has disadvantages in that costs are increased and partial damage of the vehicle body occurs.

The above information disclosed in this section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person skilled in the art.

Disclosure of Invention

The present invention provides a subframe mounting structure capable of improving collision safety by separating a subframe from a vehicle body when an impact load of a predetermined size or more is transmitted to a sub-frame portion of the vehicle body, which can be commonly applied regardless of the type of vehicle, and which reduces costs without causing damage to the vehicle body.

An exemplary embodiment of the present invention provides a subframe mounting structure, which may include: an outer tube mounted on the vehicle body; an inner pipe inserted and coupled to the outer pipe and disengaged from the outer pipe when an impact load of a predetermined magnitude or more is transmitted to the inner pipe; and an anti-rotation structure that prevents relative rotation between the inner pipe and the outer pipe, wherein the subframe may be fastened to the inner pipe to support the vehicle body through the outer pipe.

The rotation preventing structure may include: a rotation prevention coupling part having a polygonal shape formed on an inner circumferential surface of the outer tube; and a nut portion formed in a polygonal shape on an outer circumferential surface of the inner pipe to be coupled to the rotation preventing coupling portion. The outer tube may include: a pipe body in which a hole penetrating from a first side of the pipe body to a second side of the pipe body is formed; and the rotation prevention coupling part is formed on an inner circumferential surface of the pipe body. The inner tube may include: a pipe body in which a hole penetrating from a first side of the pipe body to a second side of the pipe body is formed; a nut portion formed on an outer circumferential surface of the pipe body and formed in a polygonal shape corresponding to the rotation preventing coupling portion of the outer pipe. Each polygonal shape of the outer tube and the inner tube may be a hexagonal shape.

The subframe mounting structure may further include: a critical load disengaging structure that disengages the inner pipe from the outer pipe when a load of a predetermined magnitude or greater is applied to the inner pipe. The critical load disengaging structure may include: an inclined support portion formed on the outer tube; and an engaging portion formed on the inner tube to be forcibly expanded in diameter and to be in close contact with the inclined support portion.

The outer tube may include: a pipe body in which a hole penetrating from a first side of the pipe body to a second side of the pipe body is formed; the inclined support part is formed at the upper part of the pipe body; the rotation prevention coupling part is formed at a lower portion of the tube body. The inner tube may include: a pipe body in which a hole penetrating from a first side of the pipe body to a second side of the pipe body is formed; the nut part is formed at the lower part of the pipe body; the engaging portion is formed at an upper portion of the pipe body.

The outer peripheral surface of the inner tube may include a polymer coating. A notch groove or one or more notch portions may be formed at an outer surface of the nut portion. The thickness of the engaging portion may be smaller than the thickness of the nut portion. Assembly bolts passing through the subframe may be fastened to the inner pipe.

According to an exemplary embodiment of the present invention, in the subframe mounting structure, the outer tube may be mounted on the vehicle body, and the subframe may be mounted on the vehicle body by the inner tube (which is detachably coupled to the outer tube) and the mounting bolt (which is fastened to the inner tube). Therefore, when a load impact load of a predetermined load or more is transmitted to the subframe, the inner tube can be detached from the outer tube to guide the detachment of the subframe from the vehicle body, so that the collision safety of the vehicle can be improved.

When the coupling rigidity of the inner pipe and the outer pipe is appropriately adjusted, since the collision breaking rigidity of the subframe can be adjusted, the subframe mounting structure can be universally applied to all types of vehicles, and the cost thereof can also be reduced. Since the sub-frame does not cause damage to the vehicle body when detached from the vehicle body, repair and maintenance costs of the vehicle can be reduced, and since the sub-frame can be stably supported on the vehicle body, durability of the vehicle and performance of noise, vibration, and harshness (NVH) can be improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention. In the figure:

fig. 1 is a perspective view of a subframe to which a mounting structure according to an exemplary embodiment of the present invention is applied;

FIG. 2 is a sectional view of a subframe mounting structure according to an exemplary embodiment of the invention;

FIG. 3 is a perspective view of an outer tube of the subframe mounting structure according to the exemplary embodiment of the invention;

FIGS. 4A and 4B show front and top views of an inner tube of a subframe mounting structure according to an exemplary embodiment of the invention;

FIG. 5 is a sectional view of a preliminarily assembled state of inner and outer pipes of the subframe mounting structure according to the exemplary embodiment of the invention;

FIG. 6 is a sectional view of the fully assembled state of the inner and outer tubes of the subframe mounting structure according to the exemplary embodiment of the invention;

fig. 7A and 7B are sectional views showing modifications of an inner tube according to an exemplary embodiment of the present invention;

fig. 8 is a sectional view illustrating a case where the subframe is detached from the vehicle body when an impact load is transmitted to the subframe mounting structure according to the exemplary embodiment of the present invention in a state where the subframe is mounted on the vehicle body.

Description of the reference numerals:

a: a rear mounting portion;

1: an auxiliary frame;

10: a vehicle body;

20: an outer tube;

21: an aperture;

22: a pipe body;

23: an anti-rotation coupling portion;

24: a support portion;

25: an inclined support portion;

30: an inner tube;

31: an aperture;

32: a pipe body;

33: a nut portion;

34: an extension portion;

35: a fastening part;

40: assembling the bolts;

50: a bushing;

60: a stamping device;

70: and (3) coating a polymer.

Detailed Description

It should be understood that the term "vehicle" or "vehicular" or other similar terms as used herein generally includes motor vehicles, such as passenger automobiles including Sport Utility Vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including a variety of boats, ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., fuels derived from non-petroleum sources).

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, values, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, values, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Unless specifically stated or otherwise apparent from the context, the term "about" as used herein is understood to be within the normal tolerance of the art, e.g., within 2 standard deviations on average. "about" can be understood to be within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of the stated value. Unless otherwise clear from the context, all numbers provided herein are modified by the term "about".

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, a subframe 1 to which a subframe mounting structure according to an exemplary embodiment of the present invention is applied may include a lateral frame 2, two longitudinal frames 3, and a mounting plate 4, the lateral frames 2 extending in a width direction of a vehicle; the longitudinal frame 3 is coupled to both end portions of the lateral frame 2 and extends in the length direction of the vehicle; the mounting plate 4 has a plate shape, and two longitudinal frames 3 are coupled to the mounting plate 4, respectively.

In addition, an inner space S of a substantially quadrangular shape may be divided by the lateral frames 2, the two longitudinal frames 3, and the mounting plate 4. The front mounting portions B mounted on the vehicle body may be mounted to the front portions of the two longitudinal frames 3, and the rear mounting portions a mounted on the vehicle body on the left and right sides in the width direction of the vehicle may be arranged on the mounting plate 4. The mounting structure according to the exemplary embodiment of the present invention may be particularly applied to the rear mounting portion a.

Referring to fig. 2, the subframe 1 may be detachably fastened to the vehicle body 10 by a mounting structure according to an exemplary embodiment of the present invention. The mounting structure according to an exemplary embodiment of the present invention may include an outer tube 20, an inner tube 30, and a mounting bolt 40, the outer tube 20 being fixedly coupled to a vehicle body 10; the inner tube 30 is detachably coupled to the outer tube 20; the mounting bolt 40 passes through the subframe 1 and is fastened to the inner pipe 30. The bushing 50 may be inserted and coupled to the outer circumference of the mounting bolt 40. The vehicle body 10 may include a mounting boss 11, and the outer tube 20 may be inserted into the mounting boss 11 and fixedly coupled to the mounting boss 11 by a method such as welding.

Referring to fig. 3 to 5, the outer tube 20 may include a tube body 22, wherein the hole 21 may penetrate from a first side of the outer tube 20 to a second side of the outer tube 20. The inner side of the tube body 22 may include an anti-rotation coupling portion 23 of a polygonal shape (preferably, a hexagonal shape), a support portion 24, and an inclined support portion 25, the support portion 24 extending from the anti-rotation coupling portion 23; the inclined support portion 25 is inclined from the inner diameter direction to the outer diameter direction. The inner diameter of the support portion 24 may be smaller than the inner diameter of the rotation prevention coupling portion 23 and the inner diameter of the inclined support portion 25.

Referring to fig. 4A-4B and 5, the inner tube 30 may include a tube body 32, a nut portion 33, an extension portion 34, and a catching portion 35; in said tubular body 32, a hole 31 may penetrate from a first side of the inner tube 30 to a second side of the inner tube 30; the nut portion 33 is formed on the outer peripheral surface of the pipe body 32, is formed in a polygonal shape (for example, a hexagonal shape corresponding to the shape of the rotation preventing coupling portion 23 of the outer pipe 20), and is forcibly inserted into the rotation preventing coupling portion 23; the extension portion 34 extends from the nut portion 33 and is inserted into the support portion 24 of the outer tube 20; the engaging portions 35 are inserted and coupled to the outer tube 20, and then forcibly expanded in diameter by the punching means 60 (as shown in fig. 6), and are respectively brought into close contact (e.g., abutting contact) with the inclined supports 25 of the outer tube 20.

A threaded portion may be formed on an inner circumferential surface of the nut portion 33 to fasten the assembly bolt 40 to the nut portion 33. The thickness of the engaging portion 35 may be smaller than the thickness of the nut portion 33 and the thickness of the extending portion 34, and therefore, the engaging portion 35 may have a structure in which the rigidity of the engaging portion 35 is weaker than the rigidity of the nut portion 33 and the rigidity of the extending portion 34.

The anti-rotation coupling portion 23 of the outer tube 20 and the nut portion 33 of the inner tube 30 may form an anti-rotation structure that prevents relative rotation. The engaging portion 35 of the inner tube 30 and the inclined support portion 25 of the outer tube 20 may form a critical load releasing structure. When the inner pipe 30 is inserted and coupled to the hole 21 of the outer pipe 20, the polymer coating 70 may be disposed on the outer circumferential surface of the inner pipe 30 to prevent foreign substances, such as moisture, from flowing between the inner pipe 30 and the hole 21 to corrode the inner pipe 30 and the hole 21.

Meanwhile, since the load of the forced compression can be adjusted by changing the shape of the nut portion 33, as shown in fig. 7A, the notch groove 331 may be formed by cutting the middle portion of the nut portion 33 to reduce the forced compression area, or the notch portion 332 may be formed by cutting the upper and lower portions of the nut portion 33 to reduce the forced compression area, in addition to the middle portion of the nut portion 33, as shown in fig. 7B. Therefore, the load of the forcible pressing force can be reduced and the manufacturing spread can also be absorbed. An inner material (e.g., foam) may be inserted into the cutout groove 331 or the cutout portion 332 to fill the empty space thereof.

Referring to fig. 8, when the inner pipe 30 is forcibly inserted into the outer pipe 20 to assemble the subframe 1 with the vehicle body 10, the nut portion 33 of the inner pipe 30 may be pressed into the rotation preventing coupling portion 23 of the outer pipe 20, and thus, the subframe 1 may be prevented from being detached from the vehicle body 10. In addition, due to the shape of the nut portion 33 and the shape of the anti-rotation coupling portion 23 (i.e., the shape characteristics of the nut portion 33 and the anti-rotation coupling portion 23 that are in face-to-face contact with each other), the inner tube 30 may be coupled to the outer tube 20 to prevent rotation relative to the outer tube 20.

In this state, when the engaging portion 35 of the inner tube 30 is expanded in diameter using the press device 60, since the engaging portion 35 is supported while abutting against the inclined support portion 25 of the outer tube 20, when the inner tube 30 is forcibly coupled to the outer tube 20, relative rotation and axial disengagement can be prevented. Subsequently, when the assembly bolts 40 are assembled to pass through the subframe 1 and are further screwed with the threaded portions formed on the inner peripheral surfaces of the nut portions 33 of the outer pipe 30, the subframe 1 can be stably fastened and supported with respect to the vehicle body 10 by the inner pipe 30 and the outer pipe 20.

When the subframe 1 is mounted on the vehicle body 10 (for example, the side member in the mounting structure according to the example embodiment of the invention as described above), when a collision occurs and the impact of the collision is transmitted to the mounting structure through the subframe 1, the snap-fit portion 35 of the inner pipe 30 (which is the portion of the mounting structure having the weakest rigidity) receives the impact load and can be disengaged from the outer pipe 20, while the enlarged diameter portion of the outer pipe 20 can be reduced. Therefore, the subframe 1 can also be detached from the vehicle body 10, thereby improving the collision safety of the vehicle.

Since the thickness of the engaging portion 35 can be appropriately adjusted and the subframe 1 is detached from the vehicle body 10 only when an impact load of a predetermined magnitude or more is transmitted to the subframe 1 when supporting the vehicle body during vehicle running, the detachment rigidity of the subframe 1 can be designed more easily; the subframe mounting structure of the present invention can be generally applied to all types of vehicles regardless of the type of the subframe, and also can improve the rigidity and durability of the vehicle by a stable vehicle body supported by the subframe.

As described above, although the present invention has been described with reference to the exemplary embodiments and the accompanying drawings, it will be understood by those skilled in the art that the present invention is not limited thereto, but various modifications and changes may be made without departing from the scope defined in the claims and their equivalents.