CN115180022A - Hollow front auxiliary frame with collision energy absorption structure - Google Patents

Abstract

The invention discloses a hollow front sub-frame with a collision energy-absorbing structure, comprising: a sub-frame body welding assembly, a sub-collision beam welding assembly and a rear cross beam, the sub-frame body welding assembly having a sub-frame body welding assembly The groove structure of the frame body is used to guide the collision and collapse; the auxiliary anti-collision beam welding assembly is connected with the sub-frame body welding assembly; the rear cross beam is connected with the sub-frame body welding assembly ; Compared with the welded sub-frame, the auxiliary anti-collision beam can be disassembled separately, which reduces the maintenance cost of the user; compared with the cast aluminum sub-frame, the welding + assembly process can produce larger size and specification samples; Compared with the popular frame-type sub-frame, the anti-collision beam of the sub-frame and the design of weak links on the sub-frame body are added with two layers of collision safety function design. Evenly share the body force, improve the collision safety of the whole vehicle, and reduce the amount of leg intrusion.

Description

A hollow front subframe with a collision energy-absorbing structure

technical field

The invention belongs to the technical field of automobile chassis, and in particular relates to a hollow front subframe with a collision energy-absorbing structure.

Background technique

The front subframe is a very important component in the chassis parts system. It mainly connects parts such as the body, engine mount and suspension, which can reduce the transmission of vibration and noise from the road surface to the body. The front subframe increases the stiffness of the suspension for better durability and comfort throughout the vehicle. In addition, in the field of automotive chassis technology, the safety and reliability of the front sub-frame will be directly related to the safety of driving and pedestrians. Therefore, the front subframe must have sufficient rigidity to resist deformation during a collision, so as to improve the energy absorption effect during a collision.

In terms of process form, the most popular ones on the market are welded sub-frame, cast aluminum sub-frame, cast aluminum + aluminum profile welded sub-frame; welded sub-frame includes steel plate punching and welding sub-frame, aluminum profile tailor-welded sub-frame Subframes have the disadvantages of long production preparation cycle, large tooling cost, poor reliability of welding seams, and are not conducive to the modular development of multiple models; in addition, the steel plate punching and welding subframes have high weight and are difficult to lighten Quantification; the cast aluminum subframe is subject to the limitations of casting equipment and processes, it cannot produce large-sized subframes, and it cannot carry out the modular development of multiple models; although the cast aluminum + aluminum profile welded subframe is lightweight , modular, short cycle advantages, but higher requirements for the welding position, welding seam stress.

In terms of structure, the most popular ones on the market are Yuanbao-type subframes and full-frame subframes; since Yuanbao-type subframes do not contain any collision energy-absorbing device, the collision of the whole vehicle is more dependent on the body. Its safety is poor; the most popular full-frame subframes on the market are collision structures with only energy-absorbing boxes and crushing longitudinal beams, and no anti-collision beam structure. In the process of positive collision and offset collision , only plays the role of energy absorption and collapse, can not evenly share the body force, its safety needs to be improved.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a hollow front sub-frame with a collision energy absorbing structure to solve the above-mentioned problems in the background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: a hollow front subframe with a collision energy-absorbing structure, comprising:

a sub-frame body welding assembly, the sub-frame body welding assembly having a sub-frame body groove structure for guiding collision collapse;

A secondary anti-collision beam welding assembly, the secondary anti-collision beam welding assembly is connected with the sub-frame body welding assembly;

The rear cross beam is connected with the welding assembly of the subframe body.

Further, the welding assembly of the subframe body includes a left casting body, a right casting body and a profile front beam; both ends of the profile front beam are respectively connected with the left casting body and the right casting body; the left casting body And the right casting body is cast from hollow aluminum alloy.

Further, the welding assembly of the subframe body also includes a left front steering gear installation point, a left rear steering gear installation point and a right steering gear installation point, and the subframe body groove structure is arranged on the left front steering gear installation point. point to the rear adjacent to the right front steering gear mounting point.

Further, both the left casting body and the right casting body are provided with a lining plate; the lining plate is matched with the front beam of the profile material with a small gap, and the two ends of the lining plate and the front beam of the profile material are respectively connected with the left casting plate. The backing plate of the body and the right casting body are connected by welding.

Further, the left casting body and the right casting body are both processed from casting blanks; the left casting body and the right casting body are both provided with stepped welding mating surfaces, and the stepped welding mating surfaces include a first stepped surface and the second stepped surface, the distance between the first stepped surface and the second stepped surface is d, the distance between the second stepped surface and the lining plate is e, and the front beam of the profile is connected to the lining plate. The wall thickness of the connection port is f; the casting blank has a casting deformation of the blank, wherein d≥the casting deformation of the blank, and e≥f.

Further, the left casting body is provided with a left front control arm installation point, a left rear control arm installation point, a left front body installation point, a left rear body installation point, a left rear suspension installation point, a left auxiliary anti-collision beam installation point and a left Rear cross member mounting point; the right casting body is provided with a right front control arm mounting point, a right rear control arm mounting point, a right front body mounting point, a right rear body mounting point, a right rear suspension mounting point, a right auxiliary anti-collision beam mounting point and a right a rear beam installation point; the profile front beam is provided with a front suspension installation point, and the powertrain suspension bracket is arranged on the front suspension installation point; it also includes a stabilizer bar, the stabilizer bar and the rear The cross beam is jointly arranged on the left rear cross beam installation point and the right rear cross beam installation point.

Further, the auxiliary anti-collision beam welding assembly includes:

front crash beam;

an energy-absorbing box, the front anti-collision beam is connected to the energy-absorbing box by welding;

The connecting end plate is connected with the energy absorbing box by welding.

Further, the rear beam is a concave structure with a low middle and high ends in the Z direction, and the distance between the two ends and the middle in the Z direction is a; the rear beam is provided with a through rib in the Y direction, and the through rib is convex. The starting height is b; where, b<a.

Further, the rear beam is a concave structure with a low middle and high ends in the X direction, and the distance between the two ends and the middle in the Z direction is a concave offset of c.

Further, the rear beam has a concave offset c in the X direction, and is assembled by rotating 180° along the Z axis, so as to avoid the role of gearboxes of different sizes.

Compared with the prior art, the beneficial effects of the present invention are: compared with the traditional steel plate sub-frame, the application of aluminum alloy reduces the overall weight of the sub-frame assembly by about 30-40%; Compared with the welded sub-frame, the prefabricated sub-frame assembly reduces the product production period from 6 months to 3 months; compared with the welded sub-frame, the auxiliary anti-collision beam can be disassembled separately, reducing user maintenance costs; compared with cast aluminum Compared with the subframe, the welding + assembly process can produce larger-sized samples; compared with the popular frame-type subframe on the market, the anti-collision beam of the subframe and the weak links in the design of the subframe body are added. The multi-layer collision safety function design, under the premise of meeting the energy absorption collapse of frontal collision and offset collision, evenly shares the body force, improves the collision safety of the whole vehicle, and reduces the amount of leg intrusion.

Description of drawings

1 is a schematic exploded view of a hollow front sub-frame structure with a collision energy-absorbing structure in an embodiment;

2 is a schematic exploded schematic diagram of a subframe body welding assembly structure in an embodiment;

Fig. 3 is the bottom view of the subframe body welding assembly structure in the embodiment;

Fig. 4 is the schematic exploded schematic diagram of the welding assembly of the auxiliary anti-collision beam in the embodiment;

5 is a schematic diagram of the rear beam structure in the embodiment;

6 is a schematic structural diagram of another rear beam in the embodiment;

7 is a schematic diagram of the groove structure of the sub-frame body in the embodiment;

Fig. 8 is the A-A sectional view in Fig. 3 in the embodiment;

FIG. 9 is an enlarged schematic structural diagram of part B of FIG. 8 in an embodiment.

In the picture: 1. Subframe body welding assembly; 2. Secondary anti-collision beam welding assembly; 3. Rear beam; 4.; 11. Left casting body; 12. Right casting body; 13. Profile front beam; 21 , front anti-collision beam; 22, energy absorbing box; 23, connecting end plate; 31, penetration ribs; 110, ; 111, installation point of left front control arm; 112, installation point of left rear control arm; 113, installation point of left front body; 114. Installation point of left rear body; 115. Installation point of left rear suspension; 116. Installation point of left auxiliary anti-collision beam; 117. Installation point of left rear cross beam; 118. Installation point of left front steering gear; 119. Installation of left rear steering gear 121, right front control arm installation point; 122, right rear control arm installation point; 123, right front body installation point; 124, right rear body installation point; 125, right rear suspension installation point; 126, right auxiliary crash beam Installation point; 127, installation point of right rear cross member; 128, installation point of right steering gear; 131, installation point of front suspension.

Detailed ways

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. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, unless otherwise stated, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer" The orientation or positional relationship indicated by , "front end", "rear end", "head", "tail", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, not An indication or implication that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, is not to be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection. Ground connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Please refer to the accompanying drawings in the description, the present invention provides a technical solution: a hollow front subframe with a collision energy-absorbing structure, comprising:

A sub-frame body welding assembly 1, the sub-frame body welding assembly 1 has a sub-frame body groove structure 110 for guiding collision collapse;

A secondary anti-collision beam welding assembly 2, the auxiliary anti-collision beam welding assembly 2 is connected with the sub-frame body welding assembly 1;

The rear cross beam 3 is connected with the welding assembly 1 of the subframe body.

In the above embodiment, the welding assembly 2 of the auxiliary anti-collision beam and the welding assembly 1 of the sub-frame body are added, and the weak link sub-frame body groove structure 110 is added. Under the premise of collision absorption and collapse, the force of the body is evenly shared, which improves the collision safety of the whole vehicle and reduces the amount of leg intrusion.

Preferably, the auxiliary anti-collision beam welding assembly 2 is screwed to the sub-frame body welding assembly 1 through three left and right bolts 5; the rear cross beam 3 is then welded to the sub-frame body through two left and right bolts 6 . 1. Screw connection; on the subframe body welding assembly 1, it is screwed with the powertrain suspension bracket 4 through two bolts 7.

Optionally, the subframe body welding assembly 1 includes a left casting body 11, a right casting body 12 and a profile front beam 13; both ends of the profile front beam 13 are respectively connected to the left casting body 11 and the right casting body. 12 is connected; the left casting body 11 and the right casting body 12 are both cast from hollow aluminum alloys.

In the above embodiment, preferably the left casting body 11, the right casting body 12 and the profile front beam 13 are connected by welding. This reduces the requirements for casting equipment, and also helps to alleviate the deformation problem that the opening formed by the welding assembly 1 of the sub-frame body is a "U"-shaped sub-frame casting.

Optionally, the sub-frame body welding assembly 1 further includes a left front steering gear mounting point 118, a left rear steering gear mounting point 119 and a right steering gear mounting point 128, and the sub-frame body groove structure 110 is provided in the The left front steering gear mounting point 118 and the right steering gear mounting point 128 are adjacent to the rear.

In the above embodiment, on the basis of the traditional subframe, the auxiliary anti-collision beam welding assembly 2 is added to share the force of the body anti-collision beam, so as to increase the safety of the whole vehicle in frontal collision and offset collision; and the auxiliary anti-collision beam is added. The collision beam is relatively low from the ground, which can protect the intrusion generated when colliding with a low-height opponent car. For example, an SUV with high ground clearance collides with a car with low ground clearance. The traditional body collision beam is higher, and when intercepting a car, The car has a greater impact on the SUV chassis, and is more likely to generate intrusion, causing damage to the driver's legs; further, the sub-frame body groove structure 110 is designed with a partially weakened "U"-shaped groove structure, and its function is to Guide the collision and collapse. After the failure of the more serious frontal collision or offset collision auxiliary anti-collision beam assembly, the structure collapses and deforms and even breaks, further reducing the intrusion of the cab.

Optionally, both the left casting body 11 and the right casting body 12 are provided with a lining plate; the lining plate fits with the profile front beam 13 with a small gap, and the lining plate and the two ends of the profile front beam 13 are respectively The lining plates of the left casting body 11 and the right casting body 12 are connected by welding.

In the above embodiment, the function is to satisfy the positioning of the beam in the X and Z directions, and to ensure the height of the effective welding seam.

Optionally, the left casting body 11 and the right casting body 12 are both processed from casting blanks; the left casting body 11 and the right casting body 12 are both provided with stepped welding mating surfaces, and the stepped welding mating surfaces It includes a first stepped surface and a second stepped surface. The distance between the first stepped surface and the second stepped surface is d, and the distance between the second stepped surface and the lining plate is e. The wall thickness of the connecting port connected by the lining plate is f; the casting blank has a casting deformation amount of the blank, wherein, d≥the casting deformation amount of the blank, and e≥f.

In the above embodiment, machining the stepped welding mating surface means firstly machining the first stepped surface with the machining amount d from the cast blank surface, and then machining the second stepped surface with the machining amount e. The first step machine addition d ≥ the blank casting deformation, and the second step machine addition e≥ the profile wall thickness f, the purpose is to solve the problem of insufficient weld height due to casting deformation, so as to increase the process from Weld strength.

Optionally, the left casting body 11 is provided with a left front control arm installation point 111 , a left rear control arm installation point 112 , a left front body installation point 113 , a left rear body installation point 114 , a left rear suspension installation point 115 , and a left auxiliary Anti-collision beam installation point 116 and left rear cross member installation point 117; right casting body 12 is provided with right front control arm installation point 121, right rear control arm installation point 122, right front body installation point 123, right rear body installation point 124, right rear Suspension installation point 125, right auxiliary anti-collision beam installation point 126 and right rear cross beam installation point 127; the profile front cross beam 13 is provided with a front suspension installation point 131, and the powertrain suspension bracket 4 is arranged on the The front suspension installation point 131 also includes a stabilizer bar, the stabilizer bar and the rear cross member are jointly arranged on the left rear cross member installation point 117 and the right rear cross member installation point 127 .

Optionally, the secondary anti-collision beam welding assembly 2 includes: a front anti-collision beam 21, an energy absorbing box 22 and a connecting end plate 23, and the front anti-collision beam 21 is welded to the energy absorbing box 22. Connection; the connection end plate 23 is connected to the energy absorbing box 22 by welding.

Optionally, the rear beam 3 is a concave structure with a low middle and high ends in the Z direction, and the distance between the two ends and the middle in the Z direction is a; the rear beam 3 is provided with a through rib 31 in the Y direction, so The height of the protrusion of the penetrating rib 31 is b; wherein, b<a.

In the above-mentioned embodiment, preferably, the rear beam 3 is stamped from a steel plate or an aluminum alloy plate. In order to avoid the engine and the gearbox, its Z direction as a whole presents a “concave” bend with a middle bottom and high ends at both ends. a; and the through ribs 31 distributed along the Y direction are designed, the amount of bulge is b, and b<a, the purpose of designing the through ribs 31 is to increase the Z-direction stiffness and X-direction strength of the beam; The purpose is to solve the shortcoming of the open "U"-shaped subframe and the low stiffness in the Y direction. Compared with welding large-section aluminum profiles or integral casting beams, it can take up less space and make more space for the engine and gearbox.

Optionally, the rear beam 3 is a concave structure with a low middle and high ends in the X direction, and the distance between its two ends and the middle in the X direction is a concave offset of c, that is, the left end of the rear beam 3 is connected. The distance between the center line and the center line connecting the right end installation point and the center line of the rear cross member 3 in the X direction is c.

Optionally, the rear beam 3 has a concave offset c in the X direction, and is assembled by rotating 180° along the Z axis, so as to avoid the role of gearboxes of different sizes.

In the above embodiment, the X-direction also presents a "concave" bend with a middle bottom and high ends at both ends, and the offset is c.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. The utility model provides a hollow front auxiliary frame of area collision energy-absorbing structure which characterized in that includes:

the auxiliary frame body welding assembly (1) is provided with an auxiliary frame body groove structure (110) and used for guiding collision collapse;

the auxiliary anti-collision beam welding assembly (2) is connected with the auxiliary frame body welding assembly (1);

the rear cross beam (3), the rear cross beam (3) with sub vehicle frame body welding assembly (1) is connected.

2. The hollow front subframe with a collision energy absorption structure according to claim 1, wherein the subframe body welding assembly (1) comprises a left casting body (11), a right casting body (12) and a section front cross beam (13); two ends of the section bar front beam (13) are respectively connected with the left casting body (11) and the right casting body (12); the left casting body (11) and the right casting body (12) are both cast by hollow aluminum alloy.

3. The hollow front subframe with the crash energy absorbing structure according to claim 1, wherein the subframe body welding assembly (1) further comprises a left front steering gear mounting point (118), a left rear steering gear mounting point (119) and a right steering gear mounting point (128), and the subframe body groove structure (110) is disposed behind the left front steering gear mounting point (118) and the right steering gear mounting point (128) adjacent to each other.

4. The hollow front subframe with a crash energy absorbing structure according to claim 2, wherein the left cast body (11) and the right cast body (12) are provided with lining plates; the liner plate with little clearance fit of section bar front beam (13), the liner plate with section bar front beam (13) both ends respectively with left side casting body (11) and right side casting body (12) the liner plate is connected through the welding mode.

5. The hollow front subframe with the collision energy absorption structure according to claim 4, wherein the left cast body (11) and the right cast body (12) are both machined from cast blanks; the left casting body (11) and the right casting body (12) are both provided with stepped welding matching surfaces, each stepped welding matching surface comprises a first step surface and a second step surface, the distance between each first step surface and each second step surface is d, the distance between each second step surface and a lining plate is e, and the wall thickness of a connecting port for connecting the front section beam (13) and the lining plate is f; the casting blank has blank casting deformation, wherein d is more than or equal to the blank casting deformation, and e is more than or equal to f.

6. The hollow front subframe with a collision energy absorption structure according to claim 2, wherein the left cast body (11) is provided with a left front control arm mounting point (111), a left rear control arm mounting point (112), a left front body mounting point (113), a left rear body mounting point (114), a left rear suspension mounting point (115), a left sub impact beam mounting point (116), and a left rear cross beam mounting point (117); the right casting body (12) is provided with a right front control arm mounting point (121), a right rear control arm mounting point (122), a right front vehicle body mounting point (123), a right rear vehicle body mounting point (124), a right rear suspension mounting point (125), a right auxiliary anti-collision beam mounting point (126) and a right rear cross beam mounting point (127); the profile front cross beam (13) is provided with a front suspension mounting point (131), and the power assembly suspension bracket (4) is arranged on the front suspension mounting point (131); the stabilizer bar and the rear cross beam are jointly arranged on the right rear cross beam mounting point (117) and the right rear cross beam mounting point (127).

7. The hollow front subframe with a crash energy absorbing structure according to claim 1, wherein said secondary impact beam welding assembly (2) comprises:

a front impact beam (21);

the front anti-collision beam (21) is connected with the energy absorption box (22) in a welding mode;

the connecting end plate (23) is connected with the energy absorption box (22) in a welding mode.

8. The hollow front subframe with a collision energy absorption structure as claimed in claim 1, wherein the rear cross beam (3) is of a concave structure with a low middle part and two high ends in the Z direction, and the distance between the two ends and the middle part in the Z direction is a; the rear cross beam (3) is provided with a through rib (31) in the Y direction, and the protruding height of the through rib (31) is b; wherein b is less than a.

9. The hollow front subframe with a crash energy absorbing structure according to claim 8, characterized in that the rear cross member (3) has a concave structure with a middle lower part and two higher parts in the X direction, and the concave offset of the two ends from the middle part is a distance c in the Z direction.

10. The hollow front subframe with a crash energy absorbing structure according to claim 9, characterized in that the rear cross member (3) has a concave offset c in the X-direction, and is assembled by rotating 180 ° along the Z-axis to achieve the effect of avoiding gearboxes of different sizes.

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