CN105620552B - A kind of connection structure of fore sub frame and engine mounting - Google Patents

Abstract

The invention discloses a connection structure between a front sub-frame and an engine suspension, comprising an upper plate of a sub-frame, a lower plate of a sub-frame, and an upper plate of a sub-frame and a lower plate of a sub-frame engine mount, the lower plate of the sub-frame is provided with a bolt through hole vertically upward through the engine mount and the upper plate of the sub-frame, and the bolt through hole is pierced from bottom to top to protrude from the bottom to the top. The fastening bolt of the bolt through hole of the upper plate of the sub-frame, the lower side of the lower plate of the sub-frame is provided with a protective ring surrounding the bolt head of the fastening bolt, and the protective ring includes a The plates are connected to form a cylindrical upright ring, and the lower edge of the upright ring is bent and extended inwardly to form a transverse reinforcement ring, so that the cross section of the protection ring is L-shaped. The invention has a simple structure and can effectively protect the vehicle from scratching and colliding with the bolt heads connecting the engine mount and the front sub-frame when the vehicle is moving forward or backward, thereby improving the safety performance of the vehicle during driving.

Description

A connection structure between front subframe and engine mount

technical field

The invention relates to the vehicle body structure, in particular to a connection structure between the front auxiliary frame and the engine suspension.

Background technique

The front sub-frame of the car is used as an intermediate transition connection part in the load-bearing body to provide support for the engine, and disperse and transmit the impact force from the ground and the engine to the body. The engine suspension is connected to the front sub-frame by bolts from bottom to top. Between the subframe upper plate and the subframe lower plate of the frame. For example, a "front 1 frame assembly structure" disclosed in Chinese patent literature, its announcement number is CN203601381U, includes the front sub-frame body, and the front sub-frame body includes the upper half shell of the body and the lower half shell of the body , the upper half shell of the body is fixedly connected with the lower half shell of the body, and one side of the front sub-frame body is provided with an engine suspension bracket for supporting the engine suspension system, and the front two ends of the front sub-frame body are hingedly connected with The front mounting arm and the rear two hinges are connected with the body mounting plate, and the engine suspension bracket effectively supports the engine suspension system.

However, the existing connection structure between the front sub-frame and the engine mount has the following defects: since the ground clearance of the rear mount of the engine is relatively small, when the vehicle is moving forward or backward, the exposed parts under the lower plate of the sub-frame The bolt heads connecting the engine mount and the front subframe are easily scratched and collided by the protrusions on the ground. If the bolts are light, the bolts will be displaced and loose. In severe cases, the bolt holes of the front subframe will even be torn, causing the vehicle to The bridge breaks, bringing great safety hazards to vehicles and passengers.

"A front sub-frame with an anti-collision structure" disclosed in the Chinese patent literature, its publication number is CN103640629A, is provided with a horizontal and transverse anti-collision beam in front of the front beam; The left energy-absorbing box, the right energy-absorbing box, and the anti-collision beam are connected with the front beam through the left energy-absorbing box and the right energy-absorbing box. With the above technical solution, although the huge impact energy generated by the collision can be consumed between the anti-collision beam and the energy-absorbing box, the collision deformation of the front beam of the front sub-frame can be reduced, and the handling and safety of the car can be improved. The main function of the anti-collision beam in the scheme is to absorb the impact force from the frontal collision, so it is a positive anti-collision protection for the entire front sub-frame, but it cannot effectively protect the engine mount from the protrusions on the ground. The lateral scraping and collision of the bolt heads of the front subframe, and the scratching and collision of the ground protrusions on the bolt heads connecting the engine mount and the front subframe when reversing, and the above-mentioned protective structure is also complicated in structure. , The problem of high cost.

Contents of the invention

The purpose of the present invention is to solve the problem that the fastening bolts in the existing connection structure between the front subframe and the engine mount are easily scratched and damaged by the protrusions on the ground, thereby causing potential safety hazards to the vehicle and passengers. Provides a connection structure between the front subframe and the engine mount with a simple structure, which can effectively protect the vehicle from scratching and colliding with the bolt heads connecting the engine mount and the front subframe when the vehicle is moving forward or backward. It is beneficial to improve the safety performance of the vehicle during driving.

In order to achieve the above object, the present invention adopts the following technical solutions:

A connection structure between a front subframe and an engine mount, comprising a subframe and an engine mount (3) connected to the subframe through fastening bolts, characterized in that the lower plate of the subframe A protection ring (6) surrounding the bolt head of the fastening bolt (4) is provided on the lower side.

In the prior art, people usually only consider the anti-collision protection in the event of an accidental collision while the vehicle is running, including the protection of the occupants, the protection of pedestrians and the protection of some important parts of the vehicle, but no one has paid attention to it During the running of the vehicle, the fastening bolts of the front subframe and the engine mount may be subject to bumps and scratches from raised objects on the ground, which may cause problems to the safety of the vehicle. In the connection structure between the front sub-frame and the engine suspension of the present invention, an annular protective ring is arranged on the lower side of the sub-frame, thereby enclosing the exposed part of the fastening bolts in the protective ring, so as to form a good protection for the fastening bolts. Protection, effectively avoiding the risk of the fastening bolts being displaced and loosened when they are hit by bumps on the ground, or even tearing the bolt holes of the front subframe and causing the axle to break.

Preferably, the subframe includes an upper panel (1) of the subframe and a lower panel (2) of the subframe, and the engine mount (3) is arranged on the upper panel (1) of the subframe and the lower panel of the subframe (2). Between the subframe lower plates (2), the fastening bolts (4) pass through the subframe and the engine mount (3) from bottom to top.

The upper plate of the subframe and the lower plate of the subframe sandwich the engine mount, which is beneficial to the protection of the engine mount and the balance of the force.

Preferably, the protective ring (6) includes an upright ring (61) connected to the sub-frame lower plate (2), the lower edge of the upright ring (61) is bent inward and extends to form a transverse reinforcement ring (62 ), so that the cross-section of the protection ring (6) is L-shaped.

When the upright ring of the protection ring is impacted by a lateral collision, the transverse reinforcing ring can play a good role in reinforcing and supporting the upright ring to avoid oblique damage to the upright ring.

Preferably, the upper edge of the upright ring (61) is bent and extended outward to form a transverse connecting ring (63), and the sub-frame lower plate (2) is provided with an upward inner Concave truncated conical depression (22), the upright ring (61) and the reinforcement ring (62) are connected by a transition rounded corner.

The transverse connecting ring can not only increase the connection strength with the lower plate of the sub-frame, but also act as a reinforcing ring, which can further improve the impact resistance of the protective ring. The frustum-shaped depression makes the lower plate of the subframe form a concave-convex structure at the fastening bolts, which is beneficial to improve its strength and rigidity, and on the other hand, it is beneficial to reduce the height of the upright ring, thereby improving its impact resistance.

As a preference, the upper end of the fastening bolt protruding from the upper plate of the sub-frame is threadedly connected with a square fastening nut, and the upper plate of the sub-frame is provided with a limit cover surrounding the fastening nut, The inner cavity of the limit cover is adapted to the shape of the fastening nut, the position limit cover is provided with a bolt through hole corresponding to the fastening bolt, and one side of the limit cover is opened.

The limit cover can prevent the rotation of the square fastening nut, thereby facilitating the connection of the fastening nut and preventing the fastening nut from loosening by itself. Because one side of the limit cover is open, during installation, the fastening nut can be inserted into the limit cover from the open side of the limit cover, and then connected with the fastening bolt, so the installation and replacement of the fastening nut is convenient.

Preferably, the upright ring is cylindrical, and a detachable protective cover is sheathed on the outside of the upright ring.

The protective cover and the upright ring can be threaded, which can not only protect the bolt head of the fastening bolt from the impact of the ground protrusion in the vertical direction, but also facilitate the disassembly and assembly of the fastening bolt. At the same time, it is equivalent to increasing the wall thickness of the upright ring. It is beneficial to further improve the anti-collision strength of the protective ring.

As a preference, on the lower side of the lower plate of the sub-frame located at the front and rear sides of the protective ring, opposite protective slides are provided, and the protective slide includes a slanted slide plate, and the end of the slanted slide plate away from the protective ring is connected to the sub-frame. The lower plate is connected, and the other end of the slanted slide plate close to the protective ring is inclined downward, and a support plate is connected between the lower edge of the inclined slide plate and the lower plate of the sub-frame, so that the slanted slide plate, the support A deformation cavity is formed between the plate and the lower plate of the sub-frame, and elastic blocks are filled in the deformation cavity.

When the vehicle is driving in the forward and reverse directions, the bumps on the ground will first collide with the oblique slide plate on the front side of the protective ring in the direction of travel, and the impact force at this time will be relatively small in the normal direction of the inclined slide plate. , especially, the deformation cavity formed by the inclined slide plate, the support plate and the lower plate of the sub-frame is filled with elastic blocks made of rubber, which can effectively absorb the collision energy, so the inclined slide plate is not easy to sag and deform, thus effectively Protect the protective ring and fastening bolts from bumping and scratching of raised objects on the ground.

Preferably, the support plate includes a support outer plate and a support inner plate arranged side by side and abutted together, the support inner plate is curved outward from the deformation cavity in an arc shape, and the outer support plate located outside the support inner plate The supporting outer plate is curved in an arc shape toward one side of the deformation cavity, and the axes of the arc-shaped bent supporting inner plate and the supporting outer plate are parallel to the lower plate of the sub-frame.

The arc-shaped curved support outer plate and support inner plate have extremely high compressive strength, because the arc shape of the support outer plate and support inner plate is opposite and close together, so when the inclined slide plate is subjected to extrusion force and When it is transferred to the support plate, the arc-shaped and curved support inner plate will protrude and deform outward, while the same arc-shaped and curved support outer plate will protrude and deform to the side of the support inner plate, that is to say, the support outer plate at this time The arc-shaped curved surfaces that are close to each other with the supporting inner plate are supported by each other, and the force on the supporting outer plate and the supporting inner plate is changed from pure bending stress to the pressure on the arc-shaped convex surface. Therefore, the support of the supporting plate can be greatly improved. High strength and rigidity to avoid damage to the protective landslide.

Preferably, the supporting inner plate and the supporting outer plate have the same thickness, and the radius of the arc-shaped curved supporting outer plate is smaller than the radius of the arc-shaped curved supporting inner plate.

Since the radius of the support outer plate with the same thickness is smaller than the radius of the support inner plate, the support outer plate has a higher compressive strength than the support inner plate, thereby ensuring that the support plate only It will be bent and deformed toward one side of the deformation cavity, and the elastic block in the deformation cavity can well support the support plate and absorb collision energy, thereby helping to further improve the anti-collision effect of protecting landslides.

Therefore, the present invention has the following beneficial effects: the structure is simple, and it can effectively protect the vehicle from scratching and colliding with the ground protrusions on the bolt heads connecting the engine mount and the front sub-frame when the vehicle is moving forward or backward, thereby helping to improve the safety of the vehicle during driving. safety performance.

Description of drawings

Fig. 1 is a kind of structural representation of the present invention.

Fig. 2 is a schematic diagram of the connection structure between the lower plate of the subframe and the protective ring.

Fig. 3 is a schematic diagram of the exploded structure of the protective landslide.

In the figure: 1, sub-frame upper plate 2, sub-frame lower plate 21, bolt through hole 22, conical depression 23, cutout 24, lap piece 3, engine mount 4, fastening bolt 41, fastening nut 5. Limiting cover 51, bolt hole 52, opening 6, protective ring 61, upright ring 62, reinforcing ring 63, connecting ring 64, protective cover 7, protective slide 71, inclined slide plate 711, baffle plate 712, lap joint 72. Support plate 721, support outer plate 722, support inner plate 73, deformation cavity.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, a connection structure between a front subframe and an engine mount includes a subframe and an engine mount 3, the subframe includes an upper plate 1 of the subframe, a lower plate 2 of the subframe, and the engine mount Setting 3 is arranged between the subframe upper plate 1 and the subframe lower plate 2, and the subframe upper plate 1 and the subframe lower plate 2 are made of sheet metal parts. The lower plate 2 of the sub-frame is provided with a bolt through hole 21 that vertically penetrates the engine mount 3 and the upper plate 1 of the sub-frame vertically upwards, and the fastening bolt 4 is passed through the bolt through hole 21 from bottom to top, and the fastening bolt 4 is fastened. The upper end of the bolt 4 protrudes from the bolt through hole 21 of the upper plate 1 of the sub-frame, and the upper end of the fastening bolt 4 protrudes from the upper plate 1 of the sub-frame and is threadedly connected with a square fastening nut 41, thereby connecting the engine suspension 3 to the front The subframes are connected, and the bolt heads at the bottom of the fastening bolts 4 are exposed outside the lower surface of the lower plate 2 of the subframe.

In order to facilitate the assembly of the fastening bolt 4, we can set a square limit cover 5 surrounding the fastening nut 41 on the sub-frame upper plate 1, the inner cavity of the limit cover 5 is suitable for the shape of the fastening nut 41 Matching, and the bolt through hole 51 is provided at the place corresponding to the fastening bolt on the top surface of the limit cover 5, and one side of the limit cover is opened to form an opening 52 at the same time. When installing, the fastening nut 41 can be inserted laterally into the limit cover 5 from the opening 52 of the limit cover 5, and then the fastening bolt 4 can be passed through the subframe lower plate 2, engine suspension from bottom to top. Place 3 and the bolt through hole 21 of the sub-frame upper plate 1, and fit with the fastening nut 41, and now turn the fastening bolt 4 to be threaded with the fastening nut 41. Since the fastening nut 41 is positioned by the limit cover 5, we only need to tighten the fastening bolt 4 to realize the reliable connection between the fastening bolt 4 and the fastening nut 41, and the upper end of the fastening bolt 4 passes through the limit. The bolt hole 51 on the top surface of the bit cover 5 is convenient for installation and replacement of the fastening nut 41 .

In addition, we need to set a protective ring 6 on the lower side of the sub-frame lower plate 2, the protective ring 6 includes a cylindrical upright ring 61, the upright ring 61 surrounds the bolt head of the fastening bolt 4, that is to say, the upright ring 61 is coaxial with fastening bolt 4 . The upper edge of the upright ring 61 is welded on the lower plate 2 of the sub-frame, and the suspended lower edge of the upright ring 61 is bent and extended inwardly to form a transverse reinforcement ring 62, so that the cross section of the protective ring 6 is L-shaped. In this way, the bolt heads of the fastening bolts 4 are surrounded by the protective ring 6. When the vehicle is moving forward or reversing, the protective ring 6 forms a good protection for the fastening bolts 4, which can avoid the damage caused by the bolt heads of the fastening bolts 4. When bumped by bumps on the ground, the bolt holes of the front sub-frame will be displaced and loosened, or even torn. And the transverse reinforcing ring 62 can play a good role in strengthening and supporting, avoiding the oblique damage of the upright ring 61 when being subjected to lateral collision and scraping. It can be understood that the height of the upright ring 61 should be greater than the height of the bolt head of the fastening bolt 4 above the lower side of the subframe lower plate 2, that is to say, the lower surface of the bolt head of the fastening bolt 4 should be higher than the protective The reinforcing ring 62 of the ring 6, and the upright ring 61 and the reinforcing ring 62 can be connected through a transition fillet, so as to increase the strength of the bend.

In addition, we can also set an upward and inwardly concave frustum-shaped depression 22 at the bolt through-hole 21 on the lower plate of the sub-frame. Located in the frustum-shaped depression 22 , correspondingly, we can reduce the height of the upright ring 61 , which is beneficial to improve the impact resistance of the protective ring 6 . And on the upper edge of the upright ring 61, a connecting ring 63 integrally formed by bending outwards and extending laterally is provided. The connecting ring 63 is bonded and welded on the sub-frame lower plate 2 near the conical depression 22, thereby increasing the protective ring 6 and The connection strength of the lower panel 2 of the subframe.

Further, we can also sleeve a protective cover 64 outside the cylindrical upright ring 61 , and the protective cover is threadedly connected with the upright ring 61 . In this way, the protective cover 64 can block the opening of the protective ring 6 to protect the bolt heads of the fastening bolts 4 from being impacted by protruding objects on the ground in the vertical direction. When we unscrew the protective cover 64 , the fastening bolt 4 can be easily disassembled, which is beneficial to further improve the anti-collision strength of the protective ring 6 .

In order to ensure the completeness and effectiveness of the protective ring 6, we can also set the protective landslides 7 respectively on the front and rear sides of the protective ring 6 on the lower side of the sub-frame lower plate 2, and the two protective landslides 7 are arranged oppositely. The protective landslide 7 includes an inclined slide plate 71, the end of the inclined slide plate 71 away from the protective ring 6 is connected to the lower plate 2 of the sub-frame, the other end of the inclined slide plate 71 close to the protective ring 6 is inclined downward, and the lower end edge of the inclined slide plate 71 is inclined downward. A support plate 72 is connected with the lower plate 2 of the sub-frame, thereby forming a deformation cavity 73 between the inclined slide plate 71, the support plate 72 and the lower plate 2 of the sub-frame, and the protective slide 7 is approximately A stable triangular structure. When the vehicle is running forward or reversing, the higher protrusions on the ground will first collide with the inclined slide plate 71 inclined at the protective landslide 7 on the front side of the protective ring 6 in the direction of travel. The component force in the linear direction will be relatively small, that is to say, the frontal impact force on the inclined sliding board 71 will be relatively small, therefore, the inclined sliding board 71 has a high scratching and collision strength against the raised objects on the ground. In addition, we can also fill the deformation cavity 73 with an elastic block 8 made of rubber. The elastic block 8 can effectively absorb the collision energy, so the inclined slide plate 71 is not easy to dent and deform, thereby effectively protecting the protective ring 6 and the fastening bolts. 4 Protected from collisions and scratches from raised objects on the ground. In particular, as shown in Figure 3, we can also integrally set the baffle plate 711 extending toward the lower side of the sub-frame lower plate 2 and welded together on both side edges of the inclined slide plate 71, and the baffle plate 711 is connected with the supporting inner plate at the same time. 722 are connected as a whole, so that the deformation cavity 73 forms a closed cavity, that is to say, the volume of the deformation cavity 73 will not increase, and like this, the compressive strength of the elastic block 8 in the deformation cavity 73 will be significantly Increase. In addition, we can form a rectangular slit 23 by die-cutting at the junction of the sub-frame lower plate 2 and the inclined slide plate 71, and extend downwards on the slit 23 away from the edge of the fastening bolt 4 to form an overlapping piece 24 The inclination angle of the overlapping piece 24 is the same as the inclination angle of the slanted slide plate 71, and one end of the slanted slide plate 71 connected to the lower plate 2 of the sub-frame passes through the cutout 23 and then bends and extends to form abutment against the upper side of the lower plate 2 of the sub-frame The overlapping portion 712 of the subframe is welded together with the upper side of the subframe lower plate 2, while the lapping piece 24 of the subframe lower plate is welded together with the inclined slide plate 71, thereby significantly increasing The connection strength between the inclined slide plate 71 and the lower plate 2 of the sub-frame facilitates the positioning of the inclined slide plate 71 on the lower plate 2 of the sub-frame.

In order to improve the compressive strength of the support plate 72, the support plate 72 includes a support outer plate 721 and a support inner plate 722 arranged side by side and attached together, the support outer plate 721 is connected with the inclined slide plate 71, and the support inner plate 722 is self-deformed. The cavity 73 is curved outward in an arc shape, and the support outer plate 721 located on the outside of the support inner plate 722 is bent in an arc shape toward the deformation cavity 73, and the arc-shaped curved support inner plate 722 and support outer plate 721 The axis is parallel to the sub-frame lower plate 2, that is, the arc-shaped protrusions in the middle of the arc-shaped curved support outer plate 721 and the support inner plate 722 are relatively abutted together. The curved support outer plate 721 and the support inner plate 722 have extremely high compressive strength in the lateral convex direction. The inner plate 722 will protrude and deform outwards, and the supporting outer plate 721 that is also curved in an arc will protrude and deform toward the supporting inner plate 722. The arc-shaped curved surfaces leaning against each other support each other, and the stress of the supporting outer plate 721 and the supporting inner plate 722 changes from pure bending stress to the pressure on the arc-shaped convex surface. Therefore, the strength and strength of the supporting plate 72 can be greatly improved. Rigidity, avoids the damage of protective landslide 7. Further, the support inner plate 722 and the support outer plate 721 have the same thickness, so that the two have substantially the same bending strength; and the radius of the arc-shaped curved support outer plate 721 is smaller than the arc-shaped curved support inner plate 722 , so that the supporting outer plate 721 has higher compressive strength in the lateral convex direction. That is to say, when the protective landslide 7 is subjected to the bumping and scraping of the protruding objects on the ground, it can be ensured that the support plate 72 can only be bent and deformed to the deformation cavity 73 one side, and the elastic block 8 in the deformation cavity 73 can support the support plate. 72 plays a good role in supporting and absorbing collision energy, thereby helping to further improve the anti-collision effect of the protective landslide 7 .

Claims (7)

1. A connection structure between a front subframe and an engine mount, comprising a subframe and an engine mount (3) connected to the subframe through fastening bolts (4), characterized in that the subframe The frame includes a subframe upper plate (1) and a subframe lower plate (2). The lower side of the subframe lower plate is provided with a protective ring (6) surrounding the bolt heads of the fastening bolts (4). ), the engine mount (3) is arranged between the subframe upper plate (1) and the subframe lower plate (2), and the fastening bolts (4) are penetrated from bottom to top The subframe and engine suspension (3), the protection ring (6) includes an upright ring (61) connected to the subframe lower plate (2), the lower edge of the upright ring (61) faces inward A transverse reinforcement ring (62) is formed by bending and extending, so that the cross section of the protection ring (6) is L-shaped. 2. The connection structure between the front subframe and the engine suspension according to claim 1, characterized in that, the upper edge of the upright ring (61) is bent outwards and extends to form a transverse connection ring (63) , the sub-frame lower plate (2) is provided with an upwardly concave conical depression (22) in the connecting ring (63), between the upright ring (61) and the reinforcing ring (62) connected by a transition fillet. 3. The connection structure between the front sub-frame and the engine mount according to claim 1, characterized in that the fastening bolt (4) protrudes from the upper end of the sub-frame upper plate (1) and A square fastening nut (41) is threaded, the subframe upper plate (1) is provided with a limit cover (5) surrounding the fastening nut (41), the limit cover (5) The inner cavity of the inner cavity is adapted to the shape of the fastening nut (41), the limit cover (5) is provided with a bolt through hole (51) corresponding to the fastening bolt (4), and the limit cover (5 ) is provided with an opening (52) on one side. 4. The connection structure between the front subframe and the engine mount according to claim 1, characterized in that the upright ring (61) is cylindrical, and the outer side of the upright ring (61) is sleeved with Removable guard (64). 5. A connection structure between the front subframe and the engine suspension according to claim 1 or 2 or 3 or 4, characterized in that the protection ring ( 6) There are opposite protective landslides (7) on the front and rear sides, the protective landslide (7) includes a slanted slide (71), and the end of the slanted slide (71) away from the protective ring (6) is connected with the auxiliary vehicle The frame lower plate (2) is connected, and the end of the inclined slide plate (71) close to the protective ring (6) is inclined downward, and the lower end edge of the inclined slide plate (71) is connected with the lower plate of the subframe ( 2) A support plate (72) is connected between them, so that a deformation cavity (73) is formed between the inclined slide plate (71), the support plate (72) and the sub-frame lower plate (2), and the deformation cavity (73) is filled with elastic blocks (8). 6. The connection structure between the front sub-frame and the engine suspension according to claim 5, characterized in that, the support plate (72) includes support outer plates (721) and The supporting inner plate (722), the supporting inner plate (722) is curved outward from the deformation cavity (73), and the supporting outer plate (721) located outside the supporting inner plate (722) Then the side of the deformation cavity (73) is curved in an arc shape, and the axes of the arc-shaped curved support inner plate (722) and support outer plate (721) are parallel to the subframe lower plate (2). 7. The connection structure between the front sub-frame and the engine mount according to claim 6, characterized in that the support inner plate (722) and the support outer plate (721) have the same thickness, and the arc The radius of the curved support outer plate (721) is smaller than the radius of the arc-shaped curved support inner plate (722).