CN218750998U - Lightweight welding aluminum alloy sub vehicle frame - Google Patents

Abstract

The utility model belongs to the technical field of the aluminum alloy sub vehicle frame, a lightweight welding aluminum alloy sub vehicle frame is provided, including front beam, the rear end rail, middle cross beam and longeron, front beam and rear end rail are connected respectively to the front portion and the rear portion of longeron, and the longeron divide into left longeron and right longeron, and the middle cross beam is connected between left longeron and right longeron, is connected with preceding automobile body installing support between front beam and the longeron, has in the front between automobile body installing support and the longeron and guarantees the longeron according to the mode of bending and the transmission release structure of dispersion to sub vehicle frame middle cross beam and back automobile body installing support at the auxiliary vehicle frame in the collision process. The utility model has the advantages of through rational design aluminium alloy and other subassembly welding overlap joint structures, in the lightweight, the whole mode of sub vehicle frame, rigidity, performance index such as intensity and fatigue also can satisfy and be higher than the target demand, sub vehicle frame whole frame is good in the response whole car 100% head-on collision and 25% biasing collision operating mode, satisfies the target requirement.

Description

Lightweight welding aluminum alloy sub vehicle frame

Technical Field

The utility model belongs to the technical field of the aluminum alloy sub vehicle frame, a lightweight welding aluminum alloy sub vehicle frame is related to.

Background

The layout of the front and rear power assemblies of the electric automobile is simpler than that of the power assembly of the traditional fuel vehicle, the overall layout requirement of the auxiliary frame is smoother, the application space is provided for welding the auxiliary frame by using aluminum alloy sections, the aluminum sections have good formability and crumple characteristics, the production efficiency is high, the yield is high, the collision safety structural members such as collision beams, threshold beams, auxiliary frames and the like on the front and rear of the whole vehicle play an important role, the aluminum sections are applied to the auxiliary frame, the collision requirements of the whole vehicle are facilitated, the auxiliary frame is manufactured by integrally casting the auxiliary frame, the production efficiency is low, the development cost is high, and the collision energy absorption effect of the whole vehicle is poorer; and adopt steel sub vehicle frame frock with high costs, and overall structure is heavier than aluminium sub vehicle frame, and size precision is lower, and the overlap joint scheme is complicated to lead to welding seam length longer, is unfavorable for the lightweight demand.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem, be to prior art's current situation, and provide a lightweight welding aluminum alloy sub vehicle frame, through rational design aluminium alloy and other subassembly welding overlap joint structures, in the lightweight, the whole modal of sub vehicle frame, rigidity, performance index such as intensity and fatigue also can satisfy and be higher than the target demand.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a lightweight welding aluminum alloy sub vehicle frame, includes front beam, rear frame member, middle cross beam and longeron, front beam and rear frame member are connected respectively to the front portion and the rear portion of longeron, the longeron divide into left longeron and right longeron, middle cross beam connects between left longeron and right longeron, a serial communication port, front beam and longeron between be connected with the preceding automobile body installing support that is used for the transmission bridge of collision energy, have between preceding automobile body installing support and longeron and guarantee the longeron according to the mode of bending and disperse to sub vehicle frame middle frame member and rear body installing support's transmission release structure at the auxiliary vehicle frame in the collision process.

In the lightweight welded aluminum alloy auxiliary frame, energy-absorbing box mounting brackets are welded on two sides of the front end of the front cross beam, the front vehicle body mounting brackets are respectively connected with the front cross beam and the longitudinal beam, and a vehicle body mounting sleeve is mounted on each front vehicle body mounting bracket.

In the lightweight welded aluminum alloy auxiliary frame, the longitudinal beam is respectively welded with the front cross beam and the rear vehicle body mounting bracket, and the longitudinal beam and the rear vehicle body mounting bracket form a U-shaped lap welding.

In foretell lightweight welding aluminum alloy sub vehicle frame, the rear cross beam be bayonet butt joint with being connected of back automobile body installing support, the longeron on be provided with middle automobile body installing support and preceding lower swing arm support, middle automobile body installing support pass through U type overlap joint and longeron concatenation welding, preceding lower swing arm support passes through U type overlap joint and longeron welding of Z direction.

In foretell lightweight welding aluminum alloy sub vehicle frame, the cross-section of longeron be the style of calligraphy of a day, the front end of longeron seted up U type groove, transmission release structure is including setting up at the punching press book groove of longeron rear end bottom and setting at the circular port at longeron rear end top, the punching press book groove be the V style of calligraphy.

In the above-mentioned lightweight welded aluminum alloy subframe, the cross-section of the stringer has a first cross-section and a second cross-section, the circular hole penetrates through the upper portion of the first cross-section and the upper portion of the second cross-section, the stamping folding groove is located at the bottom of the second cross-section, and the circular hole is located right above the stamping folding groove.

In the lightweight welded aluminum alloy auxiliary frame, the U-shaped groove and the middle cross beam are provided with the steering engine press-riveting sleeve.

In the lightweight welded aluminum alloy auxiliary frame, the energy absorption box mounting bracket is connected to the front part of the front cross beam, one end of the longitudinal beam is connected to the rear part of the front cross beam, the vehicle body mounting bracket is connected to the rear part of the front cross beam and the side part of the longitudinal beam, and a cross beam reinforcing bracket is connected between the middle cross beam and the longitudinal beam.

In foretell lightweight welding aluminum alloy sub vehicle frame, the cross-section of automobile body installing support be the style of calligraphy of chinese character ri, the automobile body installing support have first cavity and second cavity, have preceding ladder overlap joint mouth between the front portion of first cavity and the front portion of second cavity, the rear portion of first cavity and the rear portion of second cavity between have the back ladder overlap joint mouth, back ladder overlap joint mouth be located by U type groove, have first overlap joint between the rear portion of first cavity and the longeron and weld the connection face, first overlap joint weld the connection face and be located the first cross-section lateral part of longeron, the rear portion of second cavity and longeron between have the second overlap joint weld the connection face, the second overlap joint weld the connection face and be located the lateral part of the second cross-section of longeron.

In foretell lightweight welding aluminum alloy sub vehicle frame, the front beam be the arc, the front beam has three cavity structures, is provided with middle strengthening rib in three cavity structures.

Compared with the prior art, the utility model has the advantages of:

1. through rational design aluminium alloy and other subassembly welding overlap joint structures, in the lightweight, sub vehicle frame whole mode, rigidity, performance index such as intensity and fatigue also can satisfy and be higher than the target demand, extrude the overlap joint relation and the connection structure of section bar each other through the adjustment aluminum alloy, each installation hard spot of rational arrangement, sub vehicle frame whole frame is good in dealing with whole car 100% head-on collision and 25% offset collision operating mode, satisfies the target requirement.

2. The longitudinal beam effectively avoids the envelope of a steering machine and a sheath in a mode of machining a U-shaped groove, and the process cost of avoiding the punched groove is reduced;

3. the U-shaped groove structure at the front end of the longitudinal beam is matched with the V-shaped stamping folding groove at the bottom of the rear end of the longitudinal beam and the circular induced collapse characteristic at the top of the rear end of the longitudinal beam, so that the deformation form of the longitudinal beam reaches a bending mode in the collision process of the auxiliary frame, a power assembly and a front cabin high-pressure casting part are effectively protected, the after-sale maintenance cost is reduced, and the vehicle safety is improved.

4. Thin-walled aluminum profile accessible section bar wall thickness adjustment is extruded to front beam, longeron, preceding automobile body installing support etc. satisfies sub vehicle frame performance demand under the different load conditions, and the flexibility is high, and the advantage of the energy-absorbing of collapsing of full play extrusion section bar satisfies sub vehicle frame and puts in order the car collision requirement, and the security is high, utilizes section bar yields height, and size precision is high, and production efficiency is high, has reduced product development and manufacturing cost.

Drawings

FIG. 1 is a schematic view of the overall structure of the lightweight welded aluminum alloy subframe;

FIG. 2 is a schematic structural view of the present side member, front cross member and vehicle body after mounting the bracket;

FIG. 3 is a schematic perspective view of a longitudinal beam of the lightweight welded aluminum alloy subframe;

FIG. 4 is a schematic cross-sectional structural view of a stringer of the present lightweight welded aluminum alloy subframe;

FIG. 5 is a perspective view of the front cross member;

fig. 6 is a schematic structural view of the lower swing arm support.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "horizontal", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the invention.

In the figure, a front cross member 100; a rear cross member 200; a middle cross member 300; a left stringer 400; a right stringer 500; a left crash box mounting bracket 600; a right crash box mounting bracket 700; a left front body mount bracket 800; a right front body mount bracket 900; a left rear body mount bracket 1000; a right rear vehicle body mounting bracket 1001; a left front sleeve 1002 of the steering gear; a steering engine right front sleeve 1003; a steering rear sleeve 1004; a U-shaped groove 1005; punching a folded groove 1006; a first cross-section 1007; a second cross-section 1008; a middle stiffener 1009; a front step lap joint 1010; a rear step lap joint 1011; a first lap weld joint face 1012; a second lap weld joint surface 1013; left cross member reinforcement bracket 1014; a right beam reinforcing bracket 1015; a left center body mount bracket 1016; a right mid-body mounting bracket 1017; a left front lower swing arm support 1018; a right front lower swing arm bracket 1019; a circular hole 1020; a vehicle body mount bushing 1021.

As shown in fig. 1, the lightweight welded aluminum alloy subframe comprises a front cross beam 100, a rear cross beam 200, a middle cross beam 300 and longitudinal beams, wherein the front part and the rear part of each longitudinal beam are respectively connected with the front cross beam 100 and the rear cross beam 200, the longitudinal beams are divided into a left longitudinal beam 400 and a right longitudinal beam 500, the middle cross beam 300 is connected between the left longitudinal beam 400 and the right longitudinal beam 500, a front vehicle body mounting bracket for transmitting collision energy is connected between the front cross beam 100 and the longitudinal beams, and a transmission release structure which ensures that the longitudinal beams are scattered to the middle cross beam 300 of the subframe and the rear vehicle body mounting bracket according to a bending mode in the collision process of the subframe is arranged between the front vehicle body mounting bracket and the longitudinal beams.

Specifically, energy-absorbing box mounting brackets are welded on two sides of the front end of the front cross beam 100, the energy-absorbing box mounting brackets are divided into a left energy-absorbing box mounting bracket 600 and a right energy-absorbing box mounting bracket 700, the left energy-absorbing box mounting bracket 600 and the right energy-absorbing box mounting bracket 700 are fixed on two sides of the front end of the front cross beam 100 of the subframe in a welding mode, the front vehicle body mounting bracket is used as a transmission bridge of collision energy and is respectively connected with the front cross beam 100 and a longitudinal beam, the front vehicle body mounting bracket is divided into a left front vehicle body mounting bracket 800 and a right front vehicle body mounting bracket 900, a vehicle body mounting sleeve 1021 is mounted on the front vehicle body mounting bracket, the longitudinal beam is respectively welded with the front cross beam 100 and a rear vehicle body mounting bracket, the longitudinal beam and the rear vehicle body mounting bracket form a U-shaped lap joint, the rear vehicle body mounting bracket is also divided into a left rear vehicle body mounting bracket 1000 and a right rear vehicle body mounting bracket 1001, so that the length of a weld joint is prolonged and the weld strength of the region is improved, the fatigue risk is reduced, the U-shaped groove 1005 and the middle cross beam 300 are provided with steering engine press riveting sleeves, the steering engine press riveting sleeves of the U-shaped groove 1005 are divided into a steering engine left front sleeve 1002 and a steering engine right front sleeve 1003, the steering engine left front sleeve 1002 and the steering engine right front sleeve 1003 are respectively fixed on the left longitudinal beam 400 and the right longitudinal beam 500 through a cold connecting press riveting mode and are used as mounting supports of the steering engine, the steering engine rear sleeve 1004 is fixed inside the middle cross beam 300 through a two-point or four-point press riveting mode in a sub-part stage, the scheme adopts a cold connecting process, the welding deformation can be reduced, the connection between the rear cross beam 200 and a rear vehicle body mounting bracket is optimized as plug-in butt joint, the structural strength and the rigidity are improved, the longitudinal beams are provided with a middle vehicle body mounting bracket and a front lower swing arm bracket, the middle vehicle body mounting bracket is divided into a left middle vehicle body mounting bracket 1016 and a right middle vehicle body mounting bracket 1017, preceding lower swing arm support divide into lower swing arm support 1018 before left and lower swing arm support 1019 before the right side, middle automobile body installing support passes through U type overlap joint and longeron splice welding, improve preceding lower swing arm Z of sub vehicle frame and to dynamic rigidity, satisfy whole car NVH requirement, as optimizing, as shown in fig. 6, preceding lower swing arm support passes through U type overlap joint and longeron welding to Z, reduce like this and break away from the risk in the whole car collision operating mode in the swing arm support fracture, can furthest's satisfied vehicle safety demand in the vehicle collision operating mode.

As shown in fig. 3 and 4, the longitudinal beam is formed by extrusion molding of aluminum alloy, the cross section of the longitudinal beam is in a shape of Chinese character ri, the wall thickness dimension range of the longitudinal beam is +/-2 mm, the length and width dimension range of the cross section is +/-15 mm, the development requirements of the longitudinal beam of various auxiliary frames can be met, the front end of the longitudinal beam is provided with a U-shaped groove 1005, the U-shaped groove 1005 is mainly used for avoiding a gap of a steering engine, the problem of riveting a sleeve between the longitudinal beam and the steering engine is solved, the biggest innovation of the patent is that a transmission release structure which is matched with the U-shaped groove 1005 and ensures that the longitudinal beam is in a bending mode in the collision process of the auxiliary frame is arranged at the rear end of the longitudinal beam, collision energy is transmitted to the longitudinal beam to be absorbed and transmitted when the whole auxiliary frame is collided, the transmission release structure is mainly utilized to release energy, so that the deformation form of the longitudinal beam reaches the bending mode in the collision process of the auxiliary frame, and the power assembly and front cabin high-pressure casting parts are effectively protected, the after-sale maintenance cost is reduced, the vehicle safety is improved, the transmission releasing structure comprises a stamping folding groove 1006 arranged at the bottom of the rear end of the longitudinal beam and a circular hole 1020 arranged at the top of the rear end of the longitudinal beam, the stamping folding groove 1006 is in a V shape, the cross section of the longitudinal beam is provided with a first cross section 1007 and a second cross section 1008, the circular hole 1020 penetrates through the upper part of the first cross section 1007 and the upper part of the second cross section 1008, the stamping folding groove 1006 is arranged at the bottom of the second cross section 1008, the circular hole 1020 is arranged right above the stamping folding groove 1006 as a further optimization, a U-shaped groove 1005 is arranged on the first cross section 1007, a steering gear riveting sleeve is arranged on the U-shaped groove 1005, the collision energy generated in the collision process of the auxiliary frame is transmitted to the longitudinal beam, due to the existence of the U-shaped groove 1005, the whole longitudinal beam can be in an upward folding state, and due to the existence of the circular hole 1020 and the stamping folding groove 1006 in the V shape, circular port 1020 and punching press folding groove 1006 are equivalent to the induced breach of collapsing like this, just will produce downward this state at punching press folding groove 1006 department with energy induction, make this auxiliary frame reach the mode of bending in the positive 100% rigid wall collision operating mode like this, and the mode of collapsing of collision satisfies whole car requirement, satisfies whole car and bends the mode demand to auxiliary frame collision.

Here, in the longitudinal beam in fig. 3, a front cross beam 100, a vehicle body mounting bracket and an energy absorption box mounting bracket are arranged at the front part of the longitudinal beam, as shown in fig. 5, the front cross beam 100 is integrally arc-shaped, the front cross beam 100 is mainly designed through a three-cavity structure, the arrangement of a middle reinforcing rib 1009 plays an important role in the transmission of collision energy, the wall thickness size range of the front cross beam 100 is ± 1mm, the length and width size range of a cavity is ± 10mm, the angle variation range is ± 10 °, various sub-frame performance development requirements can be met, the energy absorption box mounting bracket is connected at the front part of the front cross beam 100, one end of the longitudinal beam is connected at the rear part of the front cross beam 100, and the vehicle body mounting bracket is connected at the rear part of the front cross beam 100 and the side part of the longitudinal beam, wherein the energy absorption box mounting bracket is used for mounting the energy absorption box, the vehicle body mounting bracket plays a role of a collision energy transmission bridge, collision energy is dispersed to the sub-frame middle cross beam 300 and the rear mounting bracket through the energy absorption box mounting bracket, so as to meet the requirements of a bending mode.

The cross section of the vehicle body mounting bracket is in a shape of Chinese character 'ri', the vehicle body mounting bracket is provided with a first cavity and a second cavity, a front step overlapping opening 1010 is arranged between the front part of the first cavity and the front part of the second cavity, a rear step overlapping opening 1011 is arranged between the rear part of the first cavity and the rear part of the second cavity, the rear step overlapping opening 1011 is positioned beside the U-shaped groove 1005, the problem of height difference connection of a gap position of the U-shaped groove 1005 of the front cross beam 100 and the longitudinal beam can be solved through the front step overlapping opening 1010 and the rear step overlapping opening 1011, a first overlapping welding connection surface 1012 is arranged between the rear part of the first cavity and the longitudinal beam, and the first overlapping welding connection surface 1012 is positioned on the side part of a first cross section 1007 of the longitudinal beam, a second lap welding connecting surface 1013 is arranged between the rear part of the second cavity and the longitudinal beam, the second lap welding connecting surface 1013 is positioned at the side part of the second cross section 1008 of the longitudinal beam, on one hand, collision energy can be better transmitted to the longitudinal beam for transmission and absorption through the first lap welding connecting surface 1012 and the second lap welding connecting surface 1013, on the other hand, lap welding consisting of two surfaces is formed, the length of a welding seam is prolonged, the welding strength of the area is improved, and the fatigue risk is reduced, a beam reinforcing bracket is connected between the middle beam 300 and the longitudinal beam, the beam reinforcing bracket is divided into a left beam reinforcing bracket 1014 and a right beam reinforcing bracket 1015, the beam reinforcing bracket is welded in an angle lap joint mode, and stress support in 25% small offset collision of the auxiliary frame can be provided; the performance indexes of the whole frame structure in all aspects meet the requirements of the whole vehicle, the welding and lapping structure is stable and reliable,

and the front cross beam 100, the longitudinal beam, the vehicle body mounting bracket and the like can extrude thin-wall aluminum profiles through the thickness adjustment of the profiles, the performance requirements of the auxiliary frame under different load conditions are met, the flexibility is high, the advantages of crumpling and energy absorption of the extruded profiles are fully exerted, the collision requirements of the auxiliary frame on the whole vehicle are met, the safety is high, the yield of the utilized profiles is high, the size precision is high, the production efficiency is high, and the product development and production cost is reduced.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein will be apparent to those skilled in the art without departing from the scope and spirit of the invention as defined in the accompanying claims.

Claims (10)

1. The utility model provides a lightweight welding aluminum alloy sub vehicle frame, includes front beam, rear frame member, middle cross beam and longeron, front beam and rear frame member are connected respectively to the front portion and the rear portion of longeron, the longeron divide into left longeron and right longeron, middle cross beam connects between left longeron and right longeron, a serial communication port, front beam and longeron between be connected with the preceding automobile body installing support that is used for the transmission bridge of collision energy, have between preceding automobile body installing support and longeron and guarantee the longeron according to the mode of bending and disperse to sub vehicle frame middle frame member and rear body installing support's transmission release structure at the auxiliary vehicle frame in the collision process.

2. The lightweight welded aluminum alloy subframe according to claim 1, wherein energy-absorbing box mounting brackets are welded to both sides of the front end of the front cross beam, the front body mounting brackets are respectively connected with the front cross beam and the longitudinal beam, and a body mounting sleeve is mounted on each front body mounting bracket.

3. The lightweight welded aluminum alloy subframe according to claim 1 or 2, wherein the side members are welded to the front cross member and the rear body mounting bracket, respectively, and the side members and the rear body mounting bracket are welded together in a U-shaped lap joint.

4. The lightweight welded aluminum alloy subframe according to claim 3, wherein the rear cross member is connected to the rear body mount bracket in a plug-in butt joint manner, the side member is provided with a center body mount bracket and a front lower swing arm bracket, the center body mount bracket is welded to the side member by a U-lap joint, and the front lower swing arm bracket is welded to the side member by a Z-direction U-lap joint.

5. The lightweight welded aluminum alloy auxiliary frame as claimed in claim 1, wherein the cross section of the longitudinal beam is a rectangular shape, the front end of the longitudinal beam is provided with a U-shaped groove, the transmission release structure comprises a stamped folded groove formed in the bottom of the rear end of the longitudinal beam and a circular hole formed in the top of the rear end of the longitudinal beam, and the stamped folded groove is V-shaped.

6. The lightweight welded aluminum alloy subframe according to claim 5, wherein the cross section of the side member has a first cross section and a second cross section, the circular hole penetrates through an upper portion of the first cross section and an upper portion of the second cross section, the stamped folded groove is located at a bottom of the second cross section, and the circular hole is located directly above the stamped folded groove.

7. The lightweight welded aluminum alloy subframe as claimed in claim 5, wherein the U-shaped groove and the middle cross beam are provided with steering gear rivet pressing sleeves.

8. The lightweight welded aluminum alloy subframe according to claim 2, wherein the crash box mounting bracket is connected to a front portion of the front cross member, one end of the side member is connected to a rear portion of the front cross member, the body mounting bracket is connected to a rear portion of the front cross member and side portions of the side member, and a cross member reinforcing bracket is connected between the middle cross member and the side member.

9. The lightweight welded aluminum alloy subframe according to claim 8, wherein the body mount bracket has a cross-section in a shape of a Chinese character 'ri', the body mount bracket has a first cavity and a second cavity, a front step overlapping opening is provided between a front portion of the first cavity and a front portion of the second cavity, a rear step overlapping opening is provided between a rear portion of the first cavity and a rear portion of the second cavity, the rear step overlapping opening is located beside the U-shaped groove, a first lap-welded joint surface is provided between the rear portion of the first cavity and the side member, the first lap-welded joint surface is located on a side portion of the first cross-section of the side member, a second lap-welded joint surface is provided between the rear portion of the second cavity and the side member, and the second lap-welded joint surface is located on a side portion of the second cross-section of the side member.

10. The lightweight welded aluminum alloy subframe as set forth in claim 1, wherein said front cross member is curved, and has a three-cavity structure with intermediate ribs disposed therein.

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