CN218287880U - Fixed connection device of lightweight aluminum alloy front longitudinal beam and automobile front longitudinal beam - Google Patents

Abstract

The utility model belongs to the technical field of the car, concretely relates to fixed connection device and car front longitudinal of longeron before lightweight aluminum alloy, include: the aluminum base is used for being welded on the aluminum alloy front longitudinal beam; and the steel thread insert is fixedly assembled with the aluminum base, and a threaded hole for mounting a bolt is formed in the steel thread insert. The utility model discloses cut apart into two parts with traditional connecting device, one of them part is aluminium system structure, this part structure be used for with the aluminum alloy front longitudinal beam weld in real time, and another part is the steel structure, this part structure is used for forming the screw hole, realize and other automobile body annexs between be connected, adopt mechanical type assembly between the above-mentioned two part structures, both realized the lightweight design of front longitudinal beam, guaranteed the joint strength between front longitudinal beam and other annexs again, improved life.

Description

Fixed connection device of lightweight aluminum alloy front longitudinal beam and automobile front longitudinal beam

Technical Field

The utility model belongs to the technical field of the car, concretely relates to fixed connection device and car front longitudinal of lightweight aluminum alloy front longitudinal.

Background

Lightweight is a main direction design direction of the current electric intelligent automobile, and the front longitudinal beam of the automobile body is also made of traditional steel steering aluminum. The body longitudinal beam is positioned at the front end of the automobile and is used for bearing a motor suspension system and connecting a front axle of a chassis, and is a main force transmission area of frontal collision and directly related to the safety performance of the automobile. The traditional vehicle body longitudinal beam is generally formed by welding high-strength steel plates, a steel threaded sleeve is welded on the inner wall of the traditional vehicle body longitudinal beam, and the chassis and a vehicle body are connected together through bolts. In the lightweight design process, the material with the longeron is changed into lighter aluminium alloy usually, however, this makes original steel screw sleeve unable with the welding of aluminium alloy longeron, no longer is applicable to the structure of aluminium alloy front longitudinal.

In order to fix a chassis front axle system, a steel threaded sleeve is usually changed into a pure aluminum threaded sleeve in the current design, so that the welding problem of the threaded sleeve can be solved, but because the hardness of an aluminum material is not as high as that of steel, a longer thread meshing length is needed to share load, the processing difficulty of the internal thread of the sleeve is greatly increased, the verticality requirement of the internal thread in the tapping process can not be guaranteed, the precision of the thread is influenced, the friction coefficient is dispersed, the torque is poor, and the chassis cannot be installed on a vehicle body in a qualified mode.

Except that the processing degree of difficulty of internal thread itself is big, the pure aluminium screw sleeve is also very big with longeron section bar welding degree of difficulty, because the length of pure aluminium sleeve, is the telescopic fifty-six times of steel usually, the non-uniformity that the welding leads to has further aggravated the straightness problem of hanging down, and this produces very big influence to the bolt tightening torque.

Further, a pure aluminum sleeve is inferior in maintainability, and repeated removal and tightening adversely affects the thread accuracy due to the soft material property of the aluminum material, and therefore, the number of times of removal is generally required to be not more than 5 for the threaded connection of aluminum.

SUMMERY OF THE UTILITY MODEL

In view of the above prior art's shortcoming, the utility model aims to provide a longeron before fixed connection device and car of longeron before lightweight aluminum alloy can enough guarantee the reliable welding of connecting piece and front longitudinal, has good threaded connection intensity again.

In order to achieve the above objects and other related objects, the present invention provides a fixed connection device for a lightweight aluminum alloy front longitudinal beam, including:

the aluminum base is used for being welded on the aluminum alloy front longitudinal beam;

and the steel thread insert is fixedly assembled with the aluminum base, and a threaded hole for mounting a bolt is formed in the steel thread insert.

In an optional embodiment of the utility model, be equipped with the mounting groove on the aluminium system base, steel screw thread inserts interference fit in the mounting groove.

In an optional embodiment of the present invention, a first limiting portion for preventing the steel threaded insert and the aluminum base from rotating relatively is disposed between the steel threaded insert and the aluminum base.

In an optional embodiment of the present invention, the first limiting portion includes a flange having a non-circular outer contour and provided on an outer peripheral surface of the steel threaded insert, and a limiting groove provided on the aluminum base and conforming to the outer contour of the flange.

In an optional embodiment of the present invention, the aluminum base is provided with a through hole coaxial with the threaded hole and running through the aluminum base, and the through hole is connected with the mounting groove as a whole.

In an optional embodiment of the present invention, a second limiting portion for limiting the relative movement between the steel threaded insert and the aluminum base along the circumferential direction is disposed between the steel threaded insert and the aluminum base.

In an optional embodiment of the present invention, the second limiting portion includes the mounting groove and a step portion provided between the through holes, and one end of the steel thread insert is abutted against the step portion.

In an optional embodiment of the present invention, the diameter of the through hole is larger than the diameter of the threaded hole.

In an optional embodiment of the present invention, a flange portion protruding outward in a radial direction is provided on an outer peripheral surface of one side of the aluminum base facing away from the mounting groove.

In order to achieve the above objects and other related objects, the present invention also provides a front longitudinal beam for an automobile, including a front longitudinal beam body made of an extruded aluminum alloy profile, and a fixed connection device of the lightweight aluminum alloy front longitudinal beam, wherein the aluminum base is welded to the surface or the inner side of the front longitudinal beam body.

The technical effects of the utility model reside in that:

the utility model discloses cut apart into two parts with traditional connecting device, one of them part is aluminium system structure, this part structure be used for with the aluminum alloy front longitudinal beam weld in real time, and another part is the steel structure, this part structure is used for forming the screw hole, realize and other automobile body annexs between be connected, adopt mechanical type assembly between the above-mentioned two part structures, both realized the lightweight design of front longitudinal beam, guaranteed the joint strength between front longitudinal beam and other annexs again, improved life.

The utility model discloses can effectively solve the not enough problem of aluminium system screw sleeve's screw thread precision, effectively improve internal screw thread morpheme size, ensure the screw in meshing that interior external screw thread can be smooth.

The flange part can increase the welding area on one hand, improves welding reliability, and on the other hand can disperse load, prevents the local deformation of front longitudinal.

The welding seam between the aluminum base and the front longitudinal beam body cannot be subjected to the action of tensile force and shearing force, and the phenomenon of welding failure between the aluminum base and the front longitudinal beam body is avoided.

Drawings

Fig. 1 is a perspective view of a fixed connection device provided by an embodiment of the present invention;

fig. 2 is a perspective view of a connection state of the fixed connection device and the front longitudinal beam provided by the embodiment of the present invention;

fig. 3 is a sectional view and a partial enlarged view of a fixed connection device provided by an embodiment of the present invention in a state of being connected to a front side member;

fig. 4 is a top view of an assembled state of a steel threaded insert and an aluminum base provided by an embodiment of the present invention;

FIG. 5 is a top view of an alternative embodiment of the present invention providing an assembled state of a steel threaded insert and an aluminum base;

fig. 6 is a top view of a steel threaded insert assembled with an aluminum base in accordance with another alternative embodiment of the present invention;

fig. 7 is a top view of a steel threaded insert assembled with an aluminum base according to yet another alternative embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and proportion of each component may be changed arbitrarily in actual implementation, and the layout of the components may be more complicated.

Referring to fig. 1-7, the technical solution of the present invention will be described in detail below with reference to an aluminum alloy front longitudinal beam structure. It is understood that the front longitudinal member is one of the main structural members of the vehicle body, which can be, on the one hand, a mounting carrier for the front attachment of the vehicle body, for example, a radiator cross member, a front axle, etc., and, on the other hand, is also one of the important safety structures of the vehicle body, which will be subjected to high impact loads when the vehicle is involved in a frontal collision, and therefore is generally integrated with a corresponding energy absorbing structure. In combination of the above two points, the front side member must be equipped with a safe and reliable connecting device to connect the front side member with other accessories. For example fixed connection device, this fixed connection device welds as an organic wholely with the front longitudinal, other automobile body annexes such as vehicle bottom dish, front axle etc. can install through the bolt fixed connection device is last.

Referring to fig. 1-3, an automobile front longitudinal beam includes a front longitudinal beam body 30 made of an extruded aluminum alloy profile, and a fixing and connecting device, where the fixing and connecting device includes an aluminum base 10 and a steel threaded insert 20, the aluminum base 10 is welded on the surface or inside of the front longitudinal beam body 30, the steel threaded insert 20 is fixedly assembled with the aluminum base 10, and a threaded hole 21 for installing a bolt is formed in the steel threaded insert 20.

It can be understood that longeron can realize automobile body lightweight design before the aluminum alloy, and steel connecting device's joint strength and life are far above aluminium system connecting device, however aluminium system front longitudinal can't directly weld with the steel part, for this reason, the utility model discloses cut apart into two parts with traditional connecting device, one of them part is aluminium system structure, this part structure be used for with aluminium alloy front longitudinal real-time welding, and another part is the steel structure, this part structure is used for forming screw hole 21, realize and other automobile body annex between be connected, adopt mechanical type assembly between the above-mentioned two parts structure, both realized front longitudinal's lightweight design, guaranteed the joint strength between front longitudinal and other annex again, improved life.

Referring to fig. 1, in an embodiment, an installation groove 11 is formed on the aluminum base 10, and the steel threaded insert 20 is interference-fitted in the installation groove 11, in this embodiment, the installation groove 11 is a cylindrical groove, but actually, the installation groove 11 may also be designed in other shapes, for example, it may be a waist-shaped groove, a rectangular groove, etc., and the installation groove 11 is a cylindrical groove in this embodiment, which is beneficial to processing and reduces manufacturing cost. In a specific example, the steel threaded insert 20 may be made of, for example, 40Cr medium carbon alloy steel, and may be repeatedly used in an infinite number of times, so as to effectively solve the problem of insufficient maintainability of the aluminum threaded sleeve.

It can be understood that the utility model discloses can effectively solve the not enough problem of aluminium system thread bush's screw thread precision, the utility model discloses a steel thread inserts 20 effective length is shorter, for example can be 18mm, impresses technology through the interference, impresses steel thread inserts 20 in aluminium system base 10, and the straightness tolerance of hanging down can be controlled within 0.08mm, satisfies the 0.15mm of designing requirement completely, has effectively improved internal screw thread form and position size, ensures the screw in meshing that interior external screw thread can be smooth.

Referring to fig. 4-7, in an embodiment, a first limiting portion for preventing the steel threaded insert 20 and the aluminum base 10 from rotating relative to each other is disposed between the two; the first limiting part comprises a flange 22 with a non-circular outer contour, which is arranged on the outer peripheral surface of the steel threaded insert 20, and a limiting groove 12 which is arranged on the aluminum base 10 and is consistent with the outer contour of the flange 22. Referring to fig. 4, in an embodiment, the outer profile of the flange 22 may be, for example, a hexagon, and it should be noted that the flange 22 may also be other rotation-stopping structures, such as an ellipse as shown in fig. 5, a flat key as shown in fig. 6, or an eccentric circle as shown in fig. 7. It can be understood that the first limiting portion can prevent the steel threaded insert 20 and the aluminum base 10 from rotating relatively, and prevent the steel threaded insert 20 from slipping during the process of connecting the bolt.

Referring to fig. 1-3, in an embodiment, a through hole 13 is disposed on the aluminum base 10 and is coaxial with the threaded hole 21 and penetrates through the aluminum base 10, and the through hole 13 is integrally connected to the mounting groove 11; a second limiting part for limiting the relative movement of the steel threaded insert 20 and the aluminum base 10 along the circumferential direction is arranged between the two; the second limiting part comprises a step part 14 arranged between the mounting groove 11 and the through hole 13, and one end of the steel threaded insert 20 is abutted against the step part 14; the aperture of the through hole 13 is larger than the major diameter of the threaded hole 21; the outer peripheral surface of the aluminum base 10 on the side back to the mounting groove 11 is provided with a flange part 15 which protrudes outwards along the radial direction.

It can be understood that when the fixed connecting device is welded with the front side rail body 30, the steel threaded insert 20 is located at the end far away from the front side rail body 30, and at this time, the flange part 15 acts on the front side rail body 30, so that the flange part 15 can increase the welding area and improve the welding reliability, and can disperse the load and prevent the local deformation of the front side rail. The through holes 13 form channels for bolts to pass through, when the front longitudinal beam body 30 is connected with other vehicle body accessories, the bolts firstly pass through the accessories, then the bolts pass through the beam wall of the front longitudinal beam body 30, and finally the bolts are connected into the threaded holes 21 through the through holes 13, at the moment, the steel threaded insert 20 transmits pressure to the aluminum base 10 through the second limiting part, and the aluminum base 10 transmits the pressure to the front longitudinal beam body 30, so that the welding seam between the aluminum base 10 and the front longitudinal beam body 30 cannot be subjected to the tensile force and the shearing force, and the phenomenon of welding failure between the aluminum base 10 and the front longitudinal beam body 30 is avoided.

To sum up, the utility model discloses cut apart into two parts with traditional connecting device, one of them part is the aluminium system structure, this part structure be used for with the aluminum alloy front longitudinal beam real-time welding, and another part is the steel structure, this part structure is used for forming screw hole 21, realize and other automobile body annexs between be connected, adopt mechanical type assembly between the above-mentioned two part structures, both realized the lightweight design of front longitudinal beam, guaranteed the joint strength between front longitudinal beam and other annexs again, improved life.

The utility model discloses can effectively solve the not enough problem of aluminium system screw sleeve's screw thread precision, effectively improve internal screw thread morpheme size, ensure the screw in meshing that interior external screw thread can be smooth.

The flange portion 15 can increase the welding area and improve the welding reliability, and can disperse the load and prevent the local deformation of the front side member.

The welding seam between the aluminum base 10 and the front longitudinal beam body 30 is not subjected to the action of tensile force and shearing force, so that the phenomenon of welding failure between the aluminum base 10 and the front longitudinal beam body 30 is avoided.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

In the description herein, numerous specific details are provided, such as examples of components and/or methods, to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that an embodiment of the invention can be practiced without one or more of the specific details, or with other apparatus, systems, assemblies, methods, components, materials, parts, and/or the like. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Reference throughout this specification to "one embodiment," "an embodiment," or "particular embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention, and not necessarily in all embodiments. Thus, appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined in any suitable manner with one or more other embodiments. It is to be understood that other variations and modifications of the embodiments of the invention described and illustrated herein are possible in light of the teachings herein and are to be considered as part of the spirit and scope of the present invention.

It will also be appreciated that one or more of the elements shown in the figures can also be implemented in a more separated or integrated manner, or even removed for inoperability in some circumstances or provided for usefulness in accordance with a particular application.

Additionally, any labeled arrows in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise specifically noted. Further, as used herein, the term "or" is generally intended to mean "and/or" unless otherwise indicated. Combinations of components or steps will also be considered as being noted where terminology is foreseen as rendering the ability to separate or combine is unclear.

As used in the description herein and throughout the claims that follow, "a," "an," and "the" include plural references unless otherwise indicated. Also, as used in the description herein and throughout the claims that follow, the meaning of "in \8230; includes" in 8230; and "on \8230; unless otherwise indicated.

The above description of illustrated embodiments of the invention, including what is described in the abstract, is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. While specific embodiments of, and examples for, the invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention, as those skilled in the relevant art will recognize and appreciate. As noted, these modifications may be made to the present invention in light of the foregoing description of illustrated embodiments of the invention and are to be included within the spirit and scope of the present invention.

The system and method have been described herein in general terms as providing details to facilitate the understanding of the invention. Furthermore, various specific details have been given to provide a general understanding of the embodiments of the invention. One skilled in the relevant art will recognize, however, that an embodiment of the invention can be practiced without one or more of the specific details, or with other apparatus, systems, assemblies, methods, components, materials, parts, and/or the like. In other instances, well-known structures, materials, and/or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Thus, although the present invention has been described herein with reference to particular embodiments thereof, freedom of modification, various changes and substitutions are also within the foregoing disclosure, and it should be understood that in some instances some features of the present invention will be employed without a corresponding use of other features without departing from the scope and spirit of the present invention as set forth. Accordingly, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the present invention. It is intended that the invention not be limited to the particular terms used in following claims and/or to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the invention is to be determined solely by the appended claims.

Claims (10)

1. The utility model provides a fixed connection device of longeron before lightweight aluminum alloy which characterized in that includes:

the aluminum base is used for being welded on the aluminum alloy front longitudinal beam;

and the steel thread insert is fixedly assembled with the aluminum base, and a threaded hole for mounting a bolt is formed in the steel thread insert.

2. The fixed connection device for the front longitudinal beam made of the light-weight aluminum alloy according to claim 1, wherein an installation groove is formed in the aluminum base, and the steel threaded insert is in interference fit with the installation groove.

3. The fixed connection device of the lightweight aluminum alloy front side member according to claim 1, wherein a first limiting portion for preventing relative rotation between the steel threaded insert and the aluminum base is provided between the steel threaded insert and the aluminum base.

4. The fixed connection device of the lightweight aluminum alloy front side member according to claim 3, wherein the first limiting portion includes a flange having a non-circular outer contour provided on an outer peripheral surface of the steel threaded insert, and a stopper groove provided on the aluminum base in conformity with an outer contour of the flange.

5. The fixed connection device of the lightweight aluminum alloy front side member according to claim 2, wherein a through hole is provided in the aluminum base, the through hole is coaxial with the threaded hole and penetrates through the aluminum base, and the through hole and the mounting groove are integrally connected.

6. The fixed connection device for the lightweight aluminum alloy front side member as recited in claim 5, wherein a second limiting portion for limiting relative movement between the steel threaded insert and the aluminum base in a circumferential direction is provided between the steel threaded insert and the aluminum base.

7. The fixed connection device of the lightweight aluminum alloy front side member as recited in claim 6, wherein the second limiting portion includes a step portion provided between the mounting groove and the through hole, and one end of the steel threaded insert abuts against the step portion.

8. The fixed connection device of the lightweight aluminum alloy front side member according to claim 5, wherein the diameter of the through hole is larger than the major diameter of the threaded hole.

9. The fixed connection device of the front longitudinal beam made of light-weight aluminum alloy as claimed in claim 2, wherein a flange portion is provided on an outer peripheral surface of the aluminum base on a side facing away from the mounting groove, the flange portion projecting radially outward.

10. An automobile front longitudinal beam, characterized by comprising a front longitudinal beam body made of extruded aluminum alloy section bars and the fixed connection device of the lightweight aluminum alloy front longitudinal beam, as claimed in any one of claims 1 to 9, wherein the aluminum base plate is welded on the surface or the inner side of the front longitudinal beam body.

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