Front auxiliary frame and automobile

Abstract

The utility model provides a front auxiliary frame and an automobile, the front auxiliary frame is applied to a rear-drive automobile type, and the front auxiliary frame comprises a front auxiliary frame front section and a front auxiliary frame rear section; the front auxiliary frame front section comprises a transverse pipe, a straight pipe and an inverted-C-shaped bent pipe. Front section connecting holes connected with the front portion of a longitudinal beam are formed in the two ends of the transverse pipe, the middle of the transverse pipe is fixedly connected with the middle of the bent pipe through a first connecting support, the left end of the bent pipe is fixedly connected with the left end of the straight pipe through a second connecting support, and the right end of the bent pipe is fixedly connected with the right end of the straight pipe through a third connecting support. A fourth connecting support is arranged on the front side edge of the front auxiliary frame rear section. The front auxiliary frame front section is detachably connected to the front auxiliary frame rear section through matching of the second connecting support, the third connecting support and the fourth connecting support. According to the utility model, under the condition that the collision reaches the standard, the weight is reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of automobile frames, and in particular relates to a front auxiliary frame and an automobile. Background Art

[0002] As the main carrier of cabin components, the front subframe can provide a mounting base for other parts and is an important component of the front cabin. In the development of new energy vehicles, front-wheel drive and rear-wheel drive models are both common power system layouts. The motor or internal combustion engine of the front-wheel drive model will be stably fixed to the front subframe and the longitudinal beam. During the collision, the power system will transmit part of the force through the front subframe to the lower body to ensure that the intrusion of the front wall into the passenger compartment is controlled within a certain range. The cabin of the rear-wheel drive model has no electric drive. During the collision, the longitudinal beam will collapse too much, causing the front wall to move back too much, affecting the safety of the driver and passengers, and causing the problem of non-compliance with the collision standard. For example, CN202923715U discloses a front subframe of an automobile and a corresponding automobile, in which the front subframe is π-shaped. While ensuring the fastening of the assembly parts, a lightweight design scheme is used to reduce costs, but if it is used in a rear-wheel drive model, there will be a problem of non-compliance with the collision standard.

[0003] CN213199896U discloses a front subframe of a vehicle, which includes a detachably connected front subframe section and a rear subframe section; the front subframe section is constructed with a front section body connection part, an anti-collision beam connection part located at the front side of the front subframe section, and two front motor suspension mounting parts located at both ends of the vehicle width direction; the rear subframe section is constructed with a steering gear mounting part and a rear section body connection part, and a rear motor suspension mounting part arranged in a triangle with the two front motor suspension mounting parts. Although this vehicle front subframe adopts a segmented structure, its main body volume and size are large and heavy, and it is only suitable for front-wheel drive models. If used in rear-wheel drive models, there will be a problem of excess performance (redundancy), which will increase the cost of the whole vehicle. Utility Model Content

[0004] The utility model aims to provide a front auxiliary frame and a car, which are suitable for rear-drive models and can reduce weight and cost while ensuring that the collision meets the standards.

[0005] The front subframe described in the utility model is applied to rear-wheel drive vehicles, and includes a front subframe front section and a front subframe rear section. The front subframe front section includes a transverse tube, a straight tube and an inverted C-shaped curved tube. Front section connecting holes connected to the front part of the longitudinal beam are provided at both ends of the transverse tube, the middle part of the transverse tube is fixedly connected to the middle part of the curved tube through a first connecting bracket, the left end of the curved tube is fixedly connected to the left end of the straight tube through a second connecting bracket, and the right end of the curved tube is fixedly connected to the right end of the straight tube through a third connecting bracket. A fourth connecting bracket is provided on the front side of the front subframe rear section. The front subframe front section is detachably connected to the front subframe rear section through the cooperation of the second connecting bracket, the third connecting bracket and the fourth connecting bracket.

[0006] Preferably, the first connecting bracket is an integrally formed sheet metal part, the middle part of the first connecting bracket has a reinforcing rib extending in the front-to-back direction, and both ends of the first connecting bracket have reinforcing flanges bent inward. The front edge of the first connecting bracket is welded to the middle part of the outer wall of the transverse tube, and the rear edge of the first connecting bracket is welded to the middle part of the outer wall of the curved tube. The reinforcing rib and the reinforcing flange both increase the strength and rigidity of the first connecting bracket.

[0007] Preferably, there are two first connecting brackets, which are arranged at intervals relative to each other, and the front edges of the two first connecting brackets are welded to the middle of the outer wall of the transverse tube, and the rear edges of the two first connecting brackets are welded to the middle of the outer wall of the curved tube. The two first connecting brackets are used to connect the transverse tube and the curved tube, and the connection is more secure.

[0008] Preferably, the second connecting bracket and the third connecting bracket are symmetrical about the Y axis (that is, the second connecting bracket and the third connecting bracket are symmetrical on the left and right). The second connecting bracket is a box-shaped structure, which is composed of a bent first connecting plate and a bent second connecting plate through overlapping and flanging welding on the front and rear sides. The front wall of the second connecting bracket has a first connecting hole for the bent pipe, the rear wall has a second connecting hole for the bent pipe, and the right wall has a straight pipe connecting hole. The left end of the bent pipe passes through the first connecting hole for the bent pipe and the second connecting hole for the bent pipe, and is welded to the hole wall of the first connecting hole for the bent pipe and the hole wall of the second connecting hole for the bent pipe. The left end of the straight pipe extends into the straight pipe connecting hole and is welded to the hole wall of the straight pipe connecting hole. The second connecting bracket and the third connecting bracket are used to realize the connection between the bent pipe and the straight pipe, and the connection is more firm.

[0009] Preferably, the upper wall and the lower wall of the second connecting bracket are provided with a bracket left connecting hole, and the upper wall and the lower wall of the third connecting bracket are provided with a bracket right connecting hole. There are two fourth connecting brackets, and the cross section is U-shaped. The two fourth connecting brackets are respectively welded to the left end and the right end of the front side of the rear section of the front sub-frame, and the fourth connecting bracket is provided with a front section mounting hole. The second connecting bracket is inserted into one fourth connecting bracket (i.e., welded to the left end of the front side of the rear section of the front sub-frame), and the bolt passes through the front section mounting hole, the left connecting hole of the bracket and is screwed with the nut, so as to realize the screw connection between the second connecting bracket and the fourth connecting bracket. The third connecting bracket is inserted into another fourth connecting bracket (i.e., welded to the right end of the front side of the rear section of the front sub-frame), and the bolt passes through the front section mounting hole, the right connecting hole of the bracket and is screwed with the nut, so as to realize the screw connection between the third connecting bracket and the fourth connecting bracket. Through the screw connection between the second connecting bracket and the fourth connecting bracket and the screw connection between the third connecting bracket and the fourth connecting bracket, the front section of the front sub-frame is screwed to the rear section of the front sub-frame.

[0010] Preferably, the cross section of the transverse tube is square, the cross section of the curved tube is circular, and the cross section of the straight tube is circular. The cross section of the transverse tube with a square cross section is more conducive to the connection with the front part of the longitudinal beam.

[0011] Preferably, two bracket mounting seats are welded on the straight pipe at intervals, and each bracket mounting seat is provided with a first mounting hole of a compressor vibration damping bracket. A second mounting hole of a compressor vibration damping bracket is provided on the rear section of the front sub-frame, and the second mounting hole of the compressor vibration damping bracket and the two first mounting holes of the compressor vibration damping bracket form a triangular distribution. The electric compressor will generate vibration during operation, and vibration isolation can be achieved by using a compressor vibration damping bracket (the compressor vibration damping bracket is used to install the electric compressor). The compressor vibration damping bracket is installed on the front sub-frame through the second mounting hole of the compressor vibration damping bracket and the two first mounting holes of the compressor vibration damping bracket, thereby ensuring stability.

[0012] Preferably, two steering gear mounting holes are provided at intervals on the rear section of the front subframe, and the two steering gear mounting holes are located on the same horizontal line. The two steering gear mounting holes are used to realize the installation of the steering gear on the front subframe. A first rear section connecting hole connected to the rear of the longitudinal beam is provided on the front left bracket and the front right bracket of the rear section of the front subframe. A second rear section connecting hole connected to the rear of the longitudinal beam is provided on the rear left mounting seat and the rear right mounting seat of the rear section of the front subframe. The connection with the rear of the longitudinal beam is realized by using the two first rear section connecting holes and the two second rear section connecting holes, thereby ensuring the firmness of the connection.

[0013] Preferably, a left first mounting hole for a left swing arm and two left mounting holes for a stabilizer bar are provided on the rear left mounting seat of the rear section of the front sub-frame, a left second mounting hole for a left swing arm is provided on the fourth connecting bracket welded to the left end of the front side of the rear section of the front sub-frame, and the axis of the first mounting hole for the left swing arm is perpendicular to the axis of the second mounting hole for the left swing arm. A right first mounting hole for a right swing arm and two right mounting holes for a stabilizer bar are provided on the rear right mounting seat of the rear section of the front sub-frame, a right second mounting hole for a right swing arm is provided on the fourth connecting bracket welded to the right end of the front side of the rear section of the front sub-frame, and the axis of the first mounting hole for the right swing arm is perpendicular to the axis of the second mounting hole for the right swing arm. The left mounting hole for the stabilizer bar and the right mounting hole for the stabilizer bar are used to realize the installation of the stabilizer bar on the front sub-frame. The left swing arm is installed on the front sub-frame through the first mounting hole for the left swing arm and the second mounting hole for the left swing arm, and the axis of the first mounting hole for the left swing arm is perpendicular to the axis of the second mounting hole for the left swing arm, which plays a limiting role in the movement of the left swing arm. The right swing arm is installed on the front subframe through the first mounting hole of the right swing arm and the second mounting hole of the right swing arm. The axis of the first mounting hole of the right swing arm is perpendicular to the axis of the second mounting hole of the right swing arm, which limits the movement of the right swing arm.

[0014] The automobile of the utility model comprises the above-mentioned front auxiliary frame.

[0015] The utility model has the following effects:

[0016] (1) The transverse tube and the curved tube are connected by a first connecting bracket, and the curved tube and the straight tube are connected by a second connecting bracket and a third connecting bracket, thereby forming a front section of the front subframe. Compared with the front section of the front subframe used in front-wheel drive vehicles, the overall weight is lighter and the cost is lower, which can reduce mold costs, make it easier for workers to assemble, improve assembly efficiency, and avoid the problem of excess performance.

[0017] (2) During a collision, the front section of the front subframe can absorb part of the collision energy. The two ends of the cross tube of the front section of the front subframe are connected to the front part of the longitudinal beam, which can effectively guide the conduction of force during the collision, meet the collision requirements (i.e., ensure that the collision meets the standards), and ensure the safety of passengers.

[0018] (3) The front section of the front subframe is detachably connected to the rear section of the front subframe. The front section of the front subframe is easy to replace, which can ensure platformization, reduce the state of parts, and reduce development costs, maintenance costs and management costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the front subframe in an embodiment of the utility model.

[0020] Figure 2 It is a schematic structural diagram of the front section of the front subframe in an embodiment of the utility model.

[0021] Figure 3It is an axonometric view of the front section of the front subframe in the embodiment of the utility model.

[0022] Figure 4 It is a structural schematic diagram of the first connecting bracket in an embodiment of the utility model.

[0023] Figure 5 It is a front view of the second connecting bracket in the embodiment of the utility model.

[0024] Figure 6 It is a top view of the second connecting bracket in the embodiment of the utility model.

[0025] Figure 7 It is a right side view of the second connecting bracket in the embodiment of the utility model.

[0026] Figure 8 It is a schematic structural diagram of the rear section of the front subframe in an embodiment of the utility model.

[0027] Fig. 9 It is a schematic structural diagram of the front subframe after the compressor vibration reduction bracket, stabilizer bar, steering gear, left swing arm and right swing arm are installed in the embodiment of the utility model.

[0028] Fig.10 This is an axonometric view of the front subframe after the compressor vibration reduction bracket, stabilizer bar, steering gear, left swing arm and right swing arm are installed in the embodiment of the utility model.

[0029] In the figure, 1-front section of the front subframe, 2-rear section of the front subframe, 3-compressor vibration damping bracket, 4-electric compressor, 5-steering gear, 6-left swing arm, 7-right swing arm, 8-stabilizer bar, 9-swing arm fastening bolt, 11-cross pipe, 12-bend pipe, 13-straight pipe, 14-first connecting bracket, 15-second connecting bracket, 16-third connecting bracket, 21-fourth connecting bracket, 22-second mounting hole of compressor vibration damping bracket, 23-steering gear mounting hole, 24-first connecting hole of the rear section, 25-second connecting hole of the rear section, 26 -first mounting hole of left swing arm, 27-left mounting hole of stabilizer bar, 28-first mounting hole of right swing arm, 29-right mounting hole of stabilizer bar, 111-front section connecting hole, 131-bracket mounting seat, 132-first mounting hole of compressor vibration reduction bracket, 141-reinforcement rib, 142-reinforcement flange, 143-positioning hole, 151-first connecting plate, 152-second connecting plate, 153-first connecting hole of bent pipe, 154-second connecting hole of bent pipe, 155-straight pipe connecting hole, 156-left connecting hole of bracket, 211-front section mounting hole. DETAILED DESCRIPTION

[0030] In order to more thoroughly understand the features and technical contents of the embodiments of the present invention, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of the present invention. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0032] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0033] It should also be pointed out that the terms "first\second\third\fourth" involved in the embodiments of the present utility model are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0034] like Figures 1 to 10 As shown, the front subframe in the embodiment of the utility model is applied to a rear-wheel drive vehicle. The front subframe includes a front subframe front section 1 and a front subframe rear section 2, and the front subframe is a left-right symmetrical structure as a whole.

[0035] The front section 1 of the front subframe includes a transverse tube 11, a straight tube 13 and an inverted C-shaped curved tube 12. Front section connection holes 111 connected to the front part of the longitudinal beam are provided at both ends of the transverse tube 11, the middle part of the transverse tube 11 is fixedly connected to the middle part of the inverted C-shaped curved tube 12 through a first connecting bracket 14, the left end of the inverted C-shaped curved tube 12 is fixedly connected to the left end of the straight tube 13 through a second connecting bracket 15, and the right end of the inverted C-shaped curved tube 12 is fixedly connected to the right end of the straight tube 13 through a third connecting bracket 16.

[0036] In some embodiments, the cross section of the transverse tube 11 is square (ie, the transverse tube 11 is a square tube), the cross section of the curved tube 12 is circular (ie, the curved tube 12 is a curved circular tube), and the cross section of the straight tube 13 is circular (ie, the straight tube 13 is a straight circular tube).

[0037] In some embodiments, the first connecting bracket 14 is an integrally formed sheet metal part, the middle part of the first connecting bracket 14 has a reinforcing rib 141 extending in the front-to-back direction, the two ends of the first connecting bracket 14 have reinforcing flanges 142 bent inward, the front edge of the first connecting bracket 14 is welded to the middle part of the outer wall of the transverse tube 11, and the rear edge of the first connecting bracket 14 is welded to the middle part of the outer wall of the inverted C-shaped curved tube 12. As an example, there are two reinforcing ribs 141, and the two reinforcing ribs 141 are spaced apart. In some embodiments, the first connecting bracket 14 is also provided with two positioning holes 143 for positioning the first connecting bracket 14 when being welded to the transverse tube 11 and the inverted C-shaped curved tube 12.

[0038] In some embodiments, there are two first connecting brackets 14, the two first connecting brackets 14 are arranged relatively spaced apart, the front edges of the two first connecting brackets 14 are welded to the middle of the outer wall of the cross tube 11, and the rear edges of the two first connecting brackets 14 are welded to the middle of the outer wall of the inverted C-shaped curved tube 12.

[0039] In some embodiments, the second connecting bracket 15 and the third connecting bracket 16 are symmetrical about the Y axis (i.e., the second connecting bracket 15 and the third connecting bracket 16 are symmetrical on the left and right). The second connecting bracket 15 is a box-shaped structure, which is composed of a bent first connecting plate 151 and a bent second connecting plate 152 through overlapping flange welding on the front and rear sides. The front wall of the second connecting bracket 15 has a first connecting hole 153 for an elbow, the rear wall of the second connecting bracket 15 has a second connecting hole 154 for an elbow, and the right wall of the second connecting bracket 15 has a straight pipe connecting hole 155. The left end of the inverted C-shaped elbow 12 passes through the first connecting hole 153 for an elbow and the second connecting hole 154 for an elbow, and is welded to the hole wall of the first connecting hole 153 for an elbow and the hole wall of the second connecting hole 154 for an elbow. The left end of the straight pipe 13 extends into the straight pipe connecting hole 155 and is welded to the hole wall of the straight pipe connecting hole 155. Similarly, the welding method of the third connecting bracket 16 and the right end of the straight pipe 13 is similar, and will not be repeated here.

[0040] The upper wall and the lower wall of the second connecting bracket 15 are provided with two bracket left connecting holes 156, and the upper wall and the lower wall of the third connecting bracket 16 are provided with two bracket right connecting holes. A fourth connecting bracket 21 is welded to the left end of the front side of the rear section 2 of the front sub-frame, and a fourth connecting bracket 21 is welded to the right end of the front side of the rear section 2 of the front sub-frame. The cross section of the fourth connecting bracket 21 is U-shaped, and each fourth connecting bracket 21 is provided with two front section mounting holes 211. The second connecting bracket 15 is inserted into the fourth connecting bracket 21 welded to the left end of the front side of the rear section 2 of the front sub-frame, and the bolt passes through the front section mounting hole 211 and the bracket left connecting hole 156 and is screwed with the nut. The third connecting bracket 16 is inserted into the fourth connecting bracket 21 welded to the right end of the front side of the rear section 2 of the front sub-frame, and the bolt passes through the front section mounting hole 211 and the bracket right connecting hole and is screwed with the nut, so that the front sub-frame front section 1 is screwed to the front sub-frame rear section 2.

[0041] In some embodiments, two bracket mounting seats 131 are welded on the straight pipe 13 at intervals, and each bracket mounting seat 131 is provided with a compressor vibration damping bracket first mounting hole 132. A compressor vibration damping bracket second mounting hole 22 is provided on the rear section 2 of the front subframe, and the compressor vibration damping bracket second mounting hole 22 and the two compressor vibration damping bracket first mounting holes 132 form a triangular distribution. The compressor vibration damping bracket second mounting hole 22 and the two compressor vibration damping bracket first mounting holes 132 provide mounting points for the compressor vibration damping bracket 3, and the compressor vibration damping bracket 3 is used to mount the electric compressor 4.

[0042] In some embodiments, two steering gear mounting holes 23 are spaced apart on the rear section 2 of the front subframe. The two steering gear mounting holes 23 are located on the same horizontal line. The two steering gear mounting holes 23 provide mounting points for the steering gear 5 .

[0043] In some embodiments, a first rear section connection hole 24 connected to the rear of the longitudinal beam is respectively formed on the front left bracket and the front right bracket of the rear section 2 of the front subframe. A second rear section connection hole 25 connected to the rear of the longitudinal beam is respectively formed on the rear left mounting seat and the rear right mounting seat of the rear section 2 of the front subframe. The connection with the rear of the longitudinal beam is realized by using two first rear section connection holes 24 and two second rear section connection holes 25.

[0044] In some embodiments, a left swing arm first mounting hole 26 and two stabilizer bar left mounting holes 27 are provided on the rear left mounting seat of the front sub-frame rear section 2, a left swing arm second mounting hole is provided on the fourth connecting bracket 21 welded to the left end of the front side of the front sub-frame rear section 2, and the axis of the left swing arm first mounting hole 26 is perpendicular to the axis of the left swing arm second mounting hole. A right swing arm first mounting hole 28 and two stabilizer bar right mounting holes 29 are provided on the rear right mounting seat of the front sub-frame rear section 2, a right swing arm second mounting hole is provided on the fourth connecting bracket 21 welded to the right end of the front side of the front sub-frame rear section 2, and the axis of the right swing arm first mounting hole 28 is perpendicular to the axis of the right swing arm second mounting hole. The left swing arm first mounting hole 26 and the left swing arm second mounting hole provide mounting points for the left swing arm 6, and the right swing arm first mounting hole 28 and the right swing arm second mounting hole provide mounting points for the right swing arm 7. The two left stabilizer bar mounting holes 27 and the two right stabilizer bar mounting holes 29 provide mounting points for the stabilizer bar 8 .

[0045] When assembling the left swing arm 6, a swing arm fastening bolt 9 passes through the first mounting hole 26 of the left swing arm and the connecting hole on the left swing arm 6 and is screwed to the nut, and a swing arm fastening bolt 9 passes through the second mounting hole of the left swing arm and the connecting hole on the left swing arm 6 and is screwed to the nut, thereby installing the left swing arm 6 on the front subframe.

[0046] When assembling the right swing arm 7, a swing arm fastening bolt 9 passes through the first mounting hole 28 of the right swing arm and the connecting hole on the right swing arm 7 and is screwed to the nut, and a swing arm fastening bolt 9 passes through the second mounting hole of the right swing arm and the connecting hole on the right swing arm 7 and is screwed to the nut, thereby installing the right swing arm 7 on the front subframe.

[0047] The electric compressor 4 is installed on the compressor vibration damping bracket 3. The electric compressor 4 and the compressor vibration damping bracket 3 are assembled as an electric compressor assembly. Three bolts pass through the second mounting hole 22 of the compressor vibration damping bracket, the two first mounting holes 132 of the compressor vibration damping bracket and the connecting holes on the compressor vibration damping bracket 3 respectively and are screwed with nuts, thereby installing the electric compressor assembly on the front subframe.

[0048] When assembling the steering gear 5, two bolts are respectively passed through the two steering gear mounting holes 23 and the connecting holes on the steering gear 5 and are screwed with nuts, so that the steering gear 5 is mounted on the front subframe.

[0049] When assembling the stabilizer bar 8, two bolts are respectively passed through the two left stabilizer bar mounting holes 27 and the connecting holes on the stabilizer bar 8 and are screwed together with nuts, and two bolts are respectively passed through the two right stabilizer bar mounting holes 29 and the connecting holes on the stabilizer bar 8 and are screwed together with nuts, thereby installing the stabilizer bar 8 on the front subframe.

[0050] An embodiment of the utility model further provides a car, which is a rear-wheel drive car and includes the above-mentioned front subframe.

[0051] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention.

Claims

1. A front subframe, applied to a rear-wheel drive vehicle, characterized in that: The invention comprises a front subframe front section (1) and a front subframe rear section (2); the front subframe front section (1) comprises a transverse tube (11), a straight tube (13) and an inverted C-shaped curved tube (12); both ends of the transverse tube (11) are provided with front section connecting holes (111) connected to the front part of the longitudinal beam; the middle part of the transverse tube (11) is fixedly connected to the middle part of the curved tube (12) through a first connecting bracket (14); the left end of the curved tube (12) is fixedly connected to the left end of the straight tube (13) through a second connecting bracket (15); the right end of the curved tube (12) is fixedly connected to the right end of the straight tube (13) through a third connecting bracket (16); a fourth connecting bracket (21) is provided on the front side of the front subframe rear section (2); the front subframe front section (1) is detachably connected to the front subframe rear section (2) through the cooperation of the second connecting bracket (15), the third connecting bracket (16) and the fourth connecting bracket (21).

2. The front subframe according to claim 1, characterized in that: The first connecting bracket (14) is an integrally formed sheet metal part, the middle portion of the first connecting bracket (14) has a reinforcing rib (141) extending in the front-rear direction, both ends of the first connecting bracket (14) have reinforcing flanges (142) bent inwardly, the front edge of the first connecting bracket (14) is welded to the middle portion of the outer wall of the transverse tube (11), and the rear edge of the first connecting bracket (14) is welded to the middle portion of the outer wall of the curved tube (12).

3. The front subframe according to claim 2, characterized in that: There are two first connecting brackets (14), which are arranged at a relative interval, the front edges of the two first connecting brackets (14) are welded to the middle of the outer wall of the transverse tube (11), and the rear edges of the two first connecting brackets (14) are welded to the middle of the outer wall of the curved tube (12).

4. The front subframe according to claim 1, characterized in that: The second connecting bracket (15) and the third connecting bracket (16) are symmetrical about the Y axis; the second connecting bracket (15) is a box-shaped structure, and is formed by a bent first connecting plate (151) and a bent second connecting plate (152) welded by overlapping flanges at the front and rear sides; the front wall of the second connecting bracket (15) has a first curved pipe connecting hole (153), the rear wall has a second curved pipe connecting hole (154), and the right wall has a straight pipe connecting hole (155); the left end of the curved pipe (12) passes through the first curved pipe connecting hole (153) and the second curved pipe connecting hole (154), and is welded to the hole wall of the first curved pipe connecting hole (153) and the hole wall of the second curved pipe connecting hole (154); the left end of the straight pipe (13) extends into the straight pipe connecting hole (155) and is welded to the hole wall of the straight pipe connecting hole (155).

5. The front subframe according to claim 4, characterized in that: The upper wall and the lower wall of the second connecting bracket (15) are both provided with a bracket left connecting hole (156), and the upper wall and the lower wall of the third connecting bracket (16) are both provided with a bracket right connecting hole correspondingly; there are two fourth connecting brackets (21), and the cross section is U-shaped, the two fourth connecting brackets (21) are respectively welded to the front side left end and the front side right end of the rear section (2) of the front sub-frame, and the fourth connecting bracket (21) is provided with a front section mounting hole (211); the second connecting bracket (15) is inserted into one fourth connecting bracket (21), the bolt passes through the front section mounting hole (211), the bracket left connecting hole (156) and is screwed with a nut, and the third connecting bracket (16) is inserted into another fourth connecting bracket (21), the bolt passes through the front section mounting hole (211), the bracket right connecting hole and is screwed with a nut.

6. The front subframe according to any one of claims 1 to 5, characterized in that: The cross section of the transverse tube (11) is square, the cross section of the curved tube (12) is circular, and the cross section of the straight tube (13) is circular.

7. The front subframe according to claim 5, characterized in that: Two bracket mounting seats (131) are welded at intervals on the straight pipe (13), and each bracket mounting seat (131) is provided with a compressor vibration reduction bracket first mounting hole (132); a compressor vibration reduction bracket second mounting hole (22) is provided on the rear section (2) of the front sub-frame, and the compressor vibration reduction bracket second mounting hole (22) and the two compressor vibration reduction bracket first mounting holes (132) form a triangular distribution.

8. The front subframe according to claim 5, characterized in that: Two steering gear mounting holes (23) are provided at intervals on the rear section (2) of the front sub-frame, and the two steering gear mounting holes (23) are located on the same horizontal line; a first rear section connecting hole (24) connected to the rear of the longitudinal beam is provided on the front left bracket and the front right bracket of the rear section (2) of the front sub-frame; and a second rear section connecting hole (25) connected to the rear of the longitudinal beam is provided on the rear left mounting seat and the rear right mounting seat of the rear section (2) of the front sub-frame.

9. The front subframe according to claim 8, characterized in that: A left swing arm first mounting hole (26) and two stabilizer bar left mounting holes (27) are formed on the rear left mounting seat of the rear section (2) of the front sub-frame, and a left swing arm second mounting hole is formed on the fourth connecting bracket (21) welded to the left end of the front side of the rear section (2) of the front sub-frame, wherein the axis of the left swing arm first mounting hole (26) is perpendicular to the axis of the left swing arm second mounting hole; A right swing arm first mounting hole (28) and two stabilizer bar right mounting holes (29) are formed on the rear right mounting seat of the rear section (2) of the front sub-frame, and a right swing arm second mounting hole is formed on the fourth connecting bracket (21) welded to the right end of the front side of the rear section (2) of the front sub-frame, wherein the axis of the right swing arm first mounting hole (28) is perpendicular to the axis of the right swing arm second mounting hole.

10. An automobile, characterized in that: It comprises the front subframe as claimed in any one of claims 1 to 9.

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