CN210139896U - Sealed auxiliary frame with inner support reinforcing plate - Google Patents

Abstract

The utility model relates to an automobile parts manufacturing and designing field specifically is a sealed sub vehicle frame of interior support reinforcing plate. The main body of the bent U-shaped reinforcing plate and the separation opening extending out of the middle of the bent U-shaped reinforcing plate enable the inner cavity of the whole auxiliary frame to form at least 3 closed independent separated cavities, and internal cavity stress structures of the auxiliary frame are controlled respectively, so that the rigidity, the torsional rigidity and the torsional resistance of the whole auxiliary frame are enhanced through the internal supporting capacity and the surface stress. The utility model provides a sealed sub vehicle frame of interior support reinforcing plate, includes frame assembly upper plate, frame assembly hypoplastron, and frame assembly upper plate, frame assembly hypoplastron lower cover close and form the hollow cavity structure in inside and set up out the assembly inner chamber, the assembly inner chamber sets up upper arc pressure-bearing support and lower arc pressure-bearing support, upper arc pressure-bearing support and lower arc pressure-bearing support top are connected on frame assembly upper plate, and the bottom is connected on frame assembly hypoplastron, and upper arc pressure-bearing support and lower arc pressure-bearing support parallel arrangement or mirror symmetry set up.

Description

Sealed auxiliary frame with inner support reinforcing plate

Technical Field

The utility model relates to an automobile parts manufacturing and designing field specifically is a sealed sub vehicle frame of interior support reinforcing plate.

Background

Due to the rapid development of automobiles, automobiles are an important vehicle for people to go out, and people pay more and more attention to the comfort, the operation stability and the safety of the automobiles. The pollution of the automobile exhaust to the environment is more and more strictly controlled by the nation.

The front auxiliary frame is used as an important part of an automobile chassis and is mainly used for mounting other parts such as an engine, a swing arm, a stabilizer bar, a steering gear and the like to form a component to be connected with an automobile body and a suspension system, and the up-and-down vibration of the engine is separated from vibration and noise through the front auxiliary frame when the automobile runs, so that the vibration transmitted to the inside of the automobile by the engine is greatly weakened, the noise is reduced, and the comfort of the whole automobile is improved. Therefore, the design of the subframe is an important part of the overall design of the automobile. This novel preceding sub vehicle frame is through continuous structural modification and various performance analysis, when making present preceding sub vehicle frame satisfy each item performance, can also realize the lightweight and fall the cost.

The conventional auxiliary frame of the automobile is mainly formed by punching and expanding a steel plate and generally comprises an upper plate and a lower plate, the upper plate and the lower plate are symmetrically spliced by utilizing the side plates of the auxiliary frame, the joint of the two side plates is welded to form a hollow cavity box structural member, the inner part of a cavity is reinforced by adopting a plurality of single side plates to strengthen a weak part, a suspension part is reinforced by a bowl-shaped structure, the upper plate is provided with a part connected with an automobile body and other structural members, the bearing capacity and the bending resistance of the auxiliary frame are very limited according to the common knowledge of mechanics, in addition, the auxiliary frame has more structural members, more forming processes are complicated, the working procedures are repeated, the production efficiency is reduced, the production cost of the auxiliary frame is relatively increased when the conventional auxiliary frame is used for loading heavy automobile types, because the weight of the automobile body is larger, and when the automobile runs on bumpy roads, the auxiliary frame is easy to crack and the like, so that potential safety hazards are brought to passengers, and the auxiliary frame with higher sealing degree and strong hanging capacity is needed.

Disclosure of Invention

The utility model provides an aim at provides the not enough of overcoming prior art, provide a sealed sub vehicle frame of interior support reinforcing plate, the main part that utilizes crooked U-shaped reinforcing plate and the part mouth that the centre extends make the inside cavity of whole sub vehicle frame form 3 at least confined cavities of separating alone, thereby control own inside cavity stress structure separately, thereby the Y that has strengthened whole sub vehicle frame to rigidity, torsional rigidity and torsional capacity for strengthening inside support ability and surface stress's differentiation ability.

The utility model discloses a realize through following technical scheme: the utility model provides a sealed sub vehicle frame of interior support reinforcing plate, includes frame assembly upper plate, frame assembly hypoplastron, and frame assembly upper plate, frame assembly hypoplastron lower cover close and form the hollow cavity structure in inside and set up out the assembly inner chamber, the assembly inner chamber sets up upper arc pressure-bearing support and lower arc pressure-bearing support, upper arc pressure-bearing support and lower arc pressure-bearing support top are connected on frame assembly upper plate, and the bottom is connected on frame assembly hypoplastron, and upper arc pressure-bearing support and lower arc pressure-bearing support parallel arrangement or mirror symmetry set up.

Preferably, a device box with a groove body structure or an arc-shaped cover body structure is arranged at the upper side of the lower plate of the frame assembly, the upper arc pressure-bearing support is divided into two parts by the device box, the left side of the device box is provided with a left upper support, and the right side of the device box is provided with a right upper support.

Preferably, a support stud is further arranged in the middle of the left upper support or the right upper support, and the left upper support and the right upper support are wound or lean against the support stud laterally.

Preferably, the top parts of the two sides of the lower plate of the frame assembly are also provided with a goat's horn tube, the head ends of the upper left support and the upper right support are connected with the device box, and the tail ends of the upper left support and the upper right support are connected with the root part of the goat's horn tube.

The lower plate of the frame assembly is preferably provided with a raised stress strip seat in the shape and position matched with the upper arc pressure-bearing support and the lower arc pressure-bearing support; the shape and the position of the upper plate of the frame assembly matched with the upper arc pressure-bearing support and the lower arc pressure-bearing support are correspondingly and concavely provided with side retaining grooves, and the outer walls of the side retaining grooves are attached to the front side of the upper arc pressure-bearing support and the rear side of the lower arc pressure-bearing support and are abutted to the support buckle.

Preferably, the head end and the tail end of the lower arc pressure-bearing support are provided with lower supporting screw tubes, the lower supporting screw tubes extend obliquely to form side supporting frames, and the lower arc pressure-bearing support and the side supporting frames arranged on the two sides of the lower arc pressure-bearing support form an I-shaped supporting structure.

Preferably, the frame assembly lower plate comprises a main body part and a frame mounting part arranged on the lower side of the main body part; the shape of the main body part and the shape and the position of the upper plate of the frame assembly, which are covered downwards, are coincided, the frame mounting part extends to be exposed at the lower corner part of the two coincided parts, and the frame mounting frame is arranged on the frame mounting part.

Preferably, the openings at the two sides of the upper plate of the frame assembly are provided with side grooves, and side baffle supporting plates are arranged in the side grooves.

Preferably, the front ends of the two sides of the upper plate of the frame assembly are tilted forwards to form a goat horn plate, a goat horn installation notch is formed in the goat horn plate matched with the goat horn pipe, and a swing arm cover plate is arranged in front of the goat horn installation notch.

As preferred the goat's horn board that frame assembly hypoplastron both sides front end matches the frame assembly upper plate sets up swing arm installation board, sets up the swing arm installing support on the swing arm installation board, and swing arm installing support top is closed the fastening by the swing arm cover plate lid.

Preferably, the swing arm mounting bracket comprises a bracket cover body, an upper side wall plate, a bottom side wall plate and a middle side wall plate, the swing arm mounting bracket is of a three-side box body structure with outer walls shaped at the top, the left side and the right side, the lower end of the swing arm mounting bracket is mounted on the lower plate of the frame assembly, the bottom of the swing arm mounting bracket is sealed, an opening is formed in the outer side of the swing arm mounting bracket, the bottom side wall plate is folded towards the inside of the box cavity, and the middle side.

Compared with the prior art, the utility model discloses the beneficial effect who has is: the utility model solves the problems existing in the prior art, such as heavy weight of the auxiliary frame, easy deformation in welding, abnormal sound, low material utilization rate, difficult processing technique, low production efficiency, high manufacturing cost, and the like; the utility model discloses the creation possess curb plate and upper and lower cover close closed expert type sub vehicle frame, main box structure frame synthetic gradually adopts punching press welded closed structure, by two about the casing with control the shrouding and constitute. The reasonable arc pressure-bearing support that has arranged the polylith as the punching press reinforcing plate utilization inside can effectual decomposition sub vehicle frame bear the stress, and eliminate stress concentration. The two ends are provided with a left and a right rear vehicle body mounting brackets, a left and a right goat's horn, a left and a right swing arm front mounting brackets and a plurality of reinforcing plates inside; the structure for reinforcing the stress of the inner cavity and the bearing capacity is realized through the reinforcing plate; the utility model discloses a foretell question has been solved to preceding sub vehicle frame, and can also satisfy all performance requirements, has better economic benefits and stronger market competition for follow-up acquisition. The front mounting point of the swing arm adopts a separated semi-box-shaped bracket. The control of welding size is facilitated, the welding process is simplified, and the material utilization rate of the upper shell is improved. The auxiliary frame rear vehicle body mounting point, this structural upper surface is by a stamping structure, can adjust energy-conserving messenger this auxiliary frame and two types of motorcycle types mutually. And the welding procedures are reduced, and the control of the welding size is facilitated. The upper plate reinforcing rib characteristic of the opening of the swing arm rear mounting point can effectively prevent the cracking risk when the opening is stressed. The engine suspension box structure is formed by a half-bowl-shaped stamping part, and the structure strengthens the strength and the rigidity of a suspension part.

Drawings

Fig. 1 is an overall structural view.

Fig. 2 is a perspective view of the whole explosion.

FIG. 3 is a view of the internal lumen of the integrated side dissection assembly.

FIG. 4 is a view of the mounting of the lower plate of the frame assembly and its accompanying structure.

FIG. 5 is a top view of the frame assembly.

Fig. 6 is a multi-section structure view of the pressure-bearing frame.

FIG. 7 is an exploded view of the lower plate mounting of the frame assembly.

FIG. 8 is a diagram of a swing arm mounting rack, a horn tube, and a vehicle body mounting bracket for mounting the lower plate of the frame assembly.

FIG. 9 is a side view of the vehicle body mounting bracket mounting.

Fig. 10 is a structural plan view of the vehicle body mounting bracket and its mounting portion.

Detailed Description

The structure of the utility model is further explained by combining with the attached drawings, the utility model solves the problems existing in the prior art, such as heavy weight of the auxiliary frame, easy deformation during welding, abnormal sound, low material utilization rate, difficult processing technology, low production efficiency, high manufacturing cost, and the like;

it should be noted that the terms "front", "back", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the inside and outside of the housing, if describing the housing cavity structure, the geometric center of the invention or a particular component thereof.

The method is realized by the following implementation method: as shown in figure 2, the closed auxiliary frame for the inner support reinforcing plate comprises a frame assembly upper plate (1) and a frame assembly lower plate (2), wherein the front edge and the rear edge of the frame assembly upper plate (1) are downwards bent, the frame assembly lower plate (2) is of a planar sheet plate arrangement structure, the frame assembly lower plate (2) downwards forms a cover-shaped structure, the frame assembly upper plate (1) and the frame assembly lower plate (2) are covered up and down to form a hollow cavity structure, so that an integrally coherent assembly inner cavity (3) can be formed, in the prior art, the upper part and the lower part are generally of a structure which is symmetrically bent along the edge direction to be spliced and then welded into a whole, as shown in figure 4, on the frame assembly lower plate (2), the auxiliary frame is an I-shaped structure with the width at two sides and the middle part gradually retracted, therefore, in order to match the structure, the arc support is generally arranged to achieve the effect of uniformly dispersing the force as much as possible, the lower plate (2) of the frame assembly is provided with an arc opening facing upwards, an arc opening facing downwards, namely the upper arc pressure-bearing support (4) and the lower arc pressure-bearing support (5) are arranged in parallel or in mirror symmetry, and stress bar seats (10) are oppositely arranged on the surface of the lower plate (2) of the frame assembly, then the inner cavity (3) of the assembly is provided with the upper arc pressure-bearing support (4) and the lower arc pressure-bearing support (5), the upper arc pressure-bearing support (4) and the lower arc pressure-bearing support (5) are of a plate-shaped structure arranged according to the stress bar seats arranged on the arcs, as shown in figure 2, the top is bent or compressed to form and provided with welding pipes or welding bars, and further, if the strength of the upper arc pressure-bearing support (4) and the lower arc pressure-bearing, but weight exceeds standard, as shown in the figure the condition sets up the lightening hole of fretwork just can, go up arc pressure-bearing support (4) and lower arc pressure-bearing support (5) top welded connection on frame assembly upper plate (1), the bottom is connected on frame assembly hypoplastron (2), frame assembly hypoplastron (2) welding is on stress strip seat (10), the corresponding position of putting on frame assembly upper plate (1) also sets up this kind and corresponds stress strip seat (10) that sets up out from frame assembly upper plate (1) upper outer wall is recessed, so have two benefits, 1 has carried out the fixed point with the position that upper arc pressure-bearing support (4) and lower arc pressure-bearing support (5) set up, help the welder or welding robot carry out quick location, and extrude from top to bottom, the result can be compacter after the lid closes, the condition that the top can not reach the top can not appear. The side plate and the upper cover and the lower cover are closed to form the closed through type auxiliary frame, a box structure frame is mainly gradually synthesized, a stamping and welding closed structure is adopted, and the auxiliary frame is composed of an upper shell, a lower shell, a left sealing plate and a right sealing plate. The reasonable arc pressure-bearing support that has arranged the polylith as the punching press reinforcing plate utilization inside, the stress that can effectual decomposition sub vehicle frame bore, and the stress concentration of eliminating, central authorities divide into 4 strip frame cavity structures, but the assembly inner chamber of all open connections of head and the tail, when carrying out stress analysis and test, very even distribution of stress is on each piece of central authorities of whole frame, the fine whole dispersion of stress and the pressure-bearing effect of doing well.

As shown in fig. 4, as the preferred upper side position of the frame assembly lower plate (2) is provided with an apparatus box (29) with a groove structure or an arc cover structure, the prior art generally directly shapes the frame assembly upper plate (1) to form an apparatus box, and then the apparatus box is spliced with the frame assembly lower plate (2), the structure can increase the manufacturing process requirements, the invention is improved by directly hollowing out the part of the frame assembly upper plate (1) where the apparatus box needs to be installed, and then independently manufacturing 1 apparatus box (29), so that the apparatus box can be directly spliced into the apparatus box groove (32), and the apparatus box is more flexible than the prior art; meanwhile, the upper arc pressure-bearing support (4) is subjected to relevant structural changes, as shown in the lower bottom of fig. 6, the upper arc pressure-bearing support (4) is divided into two parts after being installed by the device box (29), the left side of the device box (29) is provided with the upper left support (6), the right side of the device box is provided with the upper right support (7), and the upper left support (6) and the upper right support (7) are integrally welded with the device box (29) (welded on the outer wall of the side face of the device box), so that the supporting force is coherent with the device box. The device box is arranged laterally independently and is provided with a left upper support and a right upper support which have special structures, and the supports can be used for carrying out cohesion and strengthening fastening action on the side surfaces.

As shown in fig. 4, preferably, a support stud (8) is further disposed at the middle position of the left upper support (6) or the right upper support (7), and the left upper support (6) and the right upper support (7) are wound or laterally leaned on the support stud (8). The structure is arranged around and outside the support stud (8) as shown in the figure, so that the side stress and the bottom firmness of the support stud (8) can be enhanced, and the diagonal support capability can be enhanced.

As shown in fig. 4 and 9, preferably, the top parts of the two sides of the frame assembly lower plate (2) are further provided with a goat's horn tube (9), the head ends of the left upper bracket (6) and the right upper bracket (7) are connected with the device box (29), and the tail ends of the left upper bracket and the right upper bracket are connected with the root part of the goat's horn tube (9). Therefore, the horn tubes can be used as independent connecting and supporting structures and can be replaced by horn tubes with different requirements at will, and structural welding configuration is only needed according to the figure 9.

The specific structure of the arc pressure-bearing support is that a raised stress strip seat (10) is arranged in the shape and position of the lower frame assembly plate (2) matched with the upper arc pressure-bearing support (4) and the lower arc pressure-bearing support (5); the frame assembly upper plate (1) is matched with the upper arc pressure-bearing support (4) and the lower arc pressure-bearing support (5) and is correspondingly and concavely provided with a side retaining groove (11), and the outer wall of the side retaining groove (11) is attached to the front side of the upper arc pressure-bearing support (4) and the rear side of the lower arc pressure-bearing support (5) and is abutted to the buckling. The trapezoidal structure can resist the front or pressure bearing bracket at the rear part, and the structure can enhance the thrust from the front and rapidly transmit the stress.

As shown in fig. 6 and 7, preferably, the head end and the tail end of the lower arc pressure-bearing support (5) are provided with lower supporting screw tubes (12), the lower supporting screw tubes (12) are also provided with side supporting frames (13) in an obliquely extending manner, and the lower arc pressure-bearing support (5) and the side supporting frames (13) arranged on two sides of the lower arc pressure-bearing support form an i-shaped supporting structure. The arc pressure-bearing support can be divided into a plurality of ends by the winding structure, each section is connected with the vertical pipe body structure, the vertical pipe body structure can be reinforced, and the two stress structures on the side surfaces are further divided again to form another supporting cavity structure.

As shown in fig. 6 and 7, the frame assembly lower plate (2) preferably comprises a main body part (14) and a frame mounting part (15) arranged below the main body part (14); the shape of the main body part (14) and the shape and the position of the upper plate (1) of the frame assembly which covers downwards are overlapped, the frame mounting part (15) extends and is exposed at the lower corner part (16) of the frame mounting part and the frame assembly which are overlapped, and a frame mounting frame (17) is arranged on the frame mounting part (15). For the installation of the frame, the invention can independently make an extension body structure, can be spliced and matched by combining the layout structure, and can also be used for matching different vehicle types by replacing other structural forms.

Preferably, side grooves (18) are formed in openings on two sides of the frame assembly upper plate (1), and side baffle support plates (19) are installed in the side grooves (18). In the prior art, a cover body is generally required to be additionally arranged, and the cover body is directly bent to directly form a cavity.

Preferably, the front ends of the two sides of the upper plate (1) of the frame assembly are tilted forwards to form a goat horn plate (20), the goat horn plate (20) is provided with a goat horn installation notch (21) matched with the goat horn pipe, and a swing arm cover plate (22) is arranged in front of the goat horn installation notch (21). The structure here, i.e. the situation shown in the front left of fig. 2, will press directly onto the swing arm mounting bracket (24), strengthening the welding effect of the swing arm mounting bracket (24).

Preferably, the front ends of the two sides of the frame assembly lower plate (2) are matched with the horn plate (20) of the frame assembly upper plate (1) to form swing arm mounting plates (23), swing arm mounting supports (24) are arranged on the swing arm mounting plates (23), and the tops of the swing arm mounting supports (24) are covered and fastened by swing arm cover plates (22). The structure is mainly matched with the upper part, so that the two structures are mutually clamped.

Preferably, the swing arm mounting support (24) comprises a support cover body (25), an upper side wall plate (26), a bottom side wall plate (27), a middle side wall plate (28) and a lateral bottom connecting plate (32), the swing arm mounting support (24) is of a three-face box structure with outer walls shaped on the top, the left side and the right side, the lower end of the swing arm mounting support is mounted on the frame assembly lower plate (2), the bottom of the swing arm mounting support is sealed, an opening is formed in the outer side of the swing arm mounting support, the bottom side wall plate (27) is folded towards the inside of a box cavity, the middle side wall plate (28) is wound on a claw tube after being folded, and the lateral bottom connecting plate (32) and the top surface. The structure can further strengthen firmness under the condition of welding, and although the front end supporting capacity is low, the stress can extend backwards due to the clamping structure, so that the overall data is improved.

Preferably, both sides of the frame assembly upper plate (1) are of an open structure, side sealing plates (30) are arranged for sealing, the top of each side sealing plate (30) is connected to the frame assembly upper plate (1), and the bottom of each side sealing plate is connected to the frame assembly lower plate (2).

Preferably, the tail ends of the tops of the two sides of the frame assembly upper plate (1) are bent downwards and connected to the frame assembly lower plate (2), the distance between the side surface sealing plates (30) and the plate part bent downwards of the frame assembly upper plate (1) is at least 10cm, and the frame assembly upper plate (1) are mutually covered to form a backwards-arranged return cavity (31). The cavity is formed by combining and splicing the structure naturally, two layers of welding are not needed in the prior art, and the outer edge of the cavity is also propped against the main body by the outer wall of the inner side of the swing arm mounting bracket (24), so that the positioning is easy and the displacement phenomenon after welding can not occur.

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

Claims (10)

1. The utility model provides an interior closed sub vehicle frame of support reinforcing plate which characterized by: the upper and lower covers of the upper and lower frame assembly plates are closed to form an inner hollow cavity structure, an assembly inner cavity is formed, an upper arc pressure-bearing support and a lower arc pressure-bearing support are arranged in the assembly inner cavity, the top of the upper arc pressure-bearing support and the top of the lower arc pressure-bearing support are connected to the upper frame assembly plate, the bottom of the upper arc pressure-bearing support and the bottom of the lower arc pressure-bearing support are connected to the lower frame assembly plate, and the upper arc pressure-bearing support and the lower arc pressure-bearing support are arranged in parallel or in mirror symmetry.

2. The enclosed subframe for internal support stiffeners of claim 1, wherein: the upper side of the lower plate of the frame assembly is provided with a device box with a groove body structure or an arc-shaped cover body structure, the upper arc pressure-bearing support is divided into two parts by the device box, the left side of the device box is provided with an upper left support, and the right side of the device box is provided with an upper right support.

3. The enclosed subframe for internal support stiffener of claim 1 or 2 further comprising: the top parts of the two sides of the lower plate of the frame assembly are also provided with a goat's horn tube, the head ends of the upper left support and the upper right support are connected with the device box, and the tail ends of the upper left support and the upper right support are connected with the root part of the goat's horn tube.

4. The enclosed subframe for internal support stiffeners of claim 1, wherein: the lower plate of the frame assembly is provided with a raised stress strip seat matched with the shapes and positions of the upper arc pressure-bearing support and the lower arc pressure-bearing support; the shape and the position of the upper plate of the frame assembly matched with the upper arc pressure-bearing support and the lower arc pressure-bearing support are correspondingly and concavely provided with side retaining grooves, and the outer walls of the side retaining grooves are attached to the front side of the upper arc pressure-bearing support and the rear side of the lower arc pressure-bearing support and are abutted to the support buckle.

5. The enclosed subframe for internal support stiffeners of claim 2, wherein: and a support stud is further arranged in the middle of the upper left support or the upper right support, and the upper left support and the upper right support are wound or lean against the support stud laterally.

6. The enclosed subframe for internal support stiffeners of claim 1 or 4, wherein: the head end and the tail end of the lower arc pressure-bearing support are provided with lower supporting screw tubes, the lower supporting screw tubes extend obliquely to form side supporting frames, and the lower arc pressure-bearing support and the side supporting frames arranged on the two sides of the lower arc pressure-bearing support form an I-shaped supporting structure.

7. The enclosed subframe for internal support stiffeners of claim 1 or 4, wherein: the frame assembly lower plate comprises a main body part and a frame mounting part arranged on the lower side of the main body part; the main part shape and the shape, the position coincidence that the frame assembly upper plate closed to the lower lid, the frame installation department extends and exposes in both coincident lower corners, sets up the frame mounting bracket on the frame installation department, frame assembly upper plate both sides opening sets up the side groove, installs the side in the side groove and keeps off the backup pad.

8. The enclosed subframe for internal support stiffeners of claim 1 or 4, wherein: frame assembly upper plate both sides front end perk forward and set up the goat's horn board, and the goat's horn board matches goat's horn pipe and sets up the goat's horn and installs the scarce groove, and the goat's horn is installed and is lacked groove the place ahead and set up the swing arm cover plate.

9. The enclosed subframe for internal support stiffeners of claim 1 or 4, wherein: the front ends of the two sides of the lower plate of the frame assembly are matched with the horn plates of the upper plate of the frame assembly to form swing arm mounting plates, swing arm mounting supports are arranged on the swing arm mounting plates, and the tops of the swing arm mounting supports are covered and fastened by swing arm cover plates.

10. The enclosed subframe for internal support stiffeners of claim 9, wherein: the swing arm mounting bracket comprises a bracket cover body, an upper side wall plate, a bottom side wall plate and a middle side wall plate, the swing arm mounting bracket is of a three-side box body structure with outer walls shaped at the top, the left side and the right side, the lower end of the swing arm mounting bracket is mounted on the lower plate of the frame assembly, the bottom of the swing arm mounting bracket is sealed, an opening is formed in the outer side of the swing arm mounting bracket, the bottom side wall plate is folded towards the inside of the box cavity, and the middle side.

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