It is mainly used to install the pipes and accessories of the brake system and clutch system.
5. Front wall upper assembly
The front wall upper assembly includes left/right hinge base mounting plate big assembly, front wall upper
front cover big assembly, VIN number mounting plate, and front wall upper rear cover big assembly etc.
It forms a high-stiffness frame structure together with the engine compartment assembly and the front wall
lower plate assembly. It can generate strong resistant to the transverse collision and rolling deformation. It can also
separate the engine compartment form the cabin, preventing the odor entering into the cabin. Consequently, it can
isolate the noise, heat and vibration.(2) Floor Assembly The floor assembly is the base work of the main structure. It is a key component that connects various
assemblies and carries the load. The vehicle performance is subject to its strength and stiffness. For the floor
assembly, see the Fig. 5-3.
The floor assembly includes front floor assembly and rear floor assembly. The front floor mid-block goes
through a ridgy channel in longitudinal direction. It can increase the longitudinal rigidity together with the lower
floor longitudinal beam. The space below under the channel is used to install various parts and components, such
as transmission gearshift rod, parking brake cable, discharge pipe with three-way catalytic converter etc. In the
cabin, there is carpet and muffle pad. The floor frame structure is made up of front floor left/right frame, front floor
main plate assembly, front floor mid-bridge assembly, rear frame assembly, rear floor rear block assembly, rear
floor mid-block assembly and longitudinal beam etc. These parts and components provide strong and reliable carry
capacity and ensure that the vehicle meets the strict driving requirement on the body.Fig. 5-3 Floor Assembly
1. Front floor left/right frame 2. Front floor main plate assembly 3. Longitudinal beam rear block 4. Rear frame assembly
5. Rear floor rear block assembly 6. Rear floor mid-block assembly 7. Front floor mid-bridge assemblySurvey -Body Structure7-371
2
133
5
6
(2) Front FenderFront fender plays a role in front wheel apron and rotect person safty.And at the same tirne,if also woork as vehicle
styling parts.
For the match relationship between the front fender & engine hood and the front door, see Fig. 5-9.Fig. 5-9 Front Fender related to surrounding parts
A) With Engine Hood (4mm¡À1mm)
B) With Front Door (5mm¡À1mm)(3) Door Assembly Doors have LH/RH front door and rear door.
The door uses hinge gemel with limiting device, which is an open structure.
The door includes door outside plate, door inside plate, bumper and hinge reinforced plate etc.
The door has a complex structure, which is a movable component on the body. It helps the passengers get on/
off the vehicle and form an enclosed cabin with the main structure and the relevant parts. Meanwhile, the doors
are used frequently, so there is high requirement on their reliability and durability.
The outside/inside plate is molded by one complete steel sheet, which can improve the stiffness and precision.
In order to improve the safety when the vehicle is collided from the side, four doors are equipped with door
bumpers.
As shown in Fig. 5-10 and Fig. 5-11, the door assembly is made up of outside plate assembly and inside plate
assembly.Fig. 5-10 Front Door
1. Front door inner panel 2. Left front door inner reinforced panel 3. Front door window opper rail 4. Door lock reinforced panel
5. Left front door inner plate cross beam 6. Front door outer panel 7. Door bumper assembly
8. Front door upper hinge assembly 9. Front door lower hinge assembly 10. Hinge reinforced panel assemblySurvey -Body Structure7-7Engine hood
Front fenderFront door
Front fenderA
B12345678910
Fig. 5-11 Rear Door
1. Rear door inner panel 2. Rear door inner lock mounting panel 3. Rear door glass rail 4. Rear inner plate cross beam
5. Rear door outer panel 6. Door bumper assembly 7. Rear door lower hinge assembly
8. Rear door upper hinge assembly 9. Rear door inner plate hinge reinforced panel(3) Luggage Compartment Cover Assembly As shown in Fig. 5-12, the luggage compartment cover assembly includes luggage compartment cover outside
plate, luggage compartment cover inside plate, luggage compartment cover hinge mounting plate, and luggage
compartment cover lock core mounting plate etc. Fig. 5-12 Luggage Compartment Cover
1. Hinge torsion spring 2. Hinge mounting panel 3. Luggage compartment cover hinge
4. Luggage compartment cover inside panel 5. Luggage compartment cover outside panel
6. Luggage compartment cover lock core mounting panel1234568
79
1Survey -Body Structure7-8
Chapter 2 Body RepairSection 1 Body Damage Forms and requirements For RepairI. Damage Type The damage type includes deformation, crack, rust-through, water leakage, dust leakage and the like caused
by collision, overload, fatigue, and corrosion.
The body damage is not merely caused by the huge force. As some parts (such as door etc.) are damaged, the
vehicle stays in an abnormal status, which also can cause damage. In most cases, the bend and torsion is caused
by huge local load in the impact or turnover accident.
Typical Body Damage:
1. Front Center Collision (Fig. 5-13)Fig. 5-13 Front Center CollisionBody Repair -Body Damage Forms and requirements For Repair7-9 For the damage caused by the collision on the front center, it usually makes the engine compartment front part
and the engine hood left/right side extend inwards so the following positions shall be checked:
a. Ambience of the left/right assembling position of the hood plate
b. Ambience of the joints of the front cross beam and the left/right longitudinal beam
2. Front External Force or Left External Force (Fig. 5-14)Fig. 5-14 Front External Force or Left External Force As shown in Fig. 5-14, when the front is pressed or the left side end is acted by the external force, the external
force will spread to around the front suspension mounting position from the left/right side of the hood, so
deformation occurs easily in this position.
II. General Repair Principle1. Precaution
(a) Vehicle Protection
In the welding process, make sure to protect the paint, windshield,
seat and carpet with heat-resistant and fireproof covering.
(b) Safety Measures
(1)When pulling the body or crossbeam with drawing device, do
not stand at the position in the same line of the drawing cable,
and make sure to use safe drawing cable.
(2)Before repairing, make sure to check whether there is any
leakage. In case of any hole, remove it immediately.
(3)When welding near to the oil tank, make sure to remove the
oil tank first, and block the oil pipe.
(c) Protective Article
In the repairing process, make sure to wear uniforms, helmet and
safety shoes. In addition, according to the different work types,
wear proper gloves, welding mask, goggle, earplug, face cover,
and dust respirator etc. Wear the protective devices properly as
the table below.Body Repair -Body Damage Forms and requirements For Repair7-11Seat covering Windshield
coveringWrongWrongItem
Dust Respirator
Mask
Goggles
Safety Shoes
Welded Goggle
Earplug
Welded Mask
Welded Gloves Code
A
B
C
D
E
F
G
H
5. Base Anti-rust Processing
Impact-proof Coat
In order to avoid corrosion and protect the body from being damaged by bouncing stone on the road, a layer
of impact-proof coat is applied on the door threshold plate, arc area and balancing plate etc.
Tips: There are two types of painting: impact-resistant coat on the electrophoresis primer or on the surface paint
according to different types and painting positions. (See Fig.5-22)7-15IV. Repair Requirement 1. As the body is an integral structure and the steel plates used are not thick, special attention shall be paid to
reinforce the parts acted in the reshaping process in the plate work processing. For the parts that burden the stress
intensively, measures shall be taken to lower the local stress.
2. After the plate work processing, note to apply the antirust primer on the inside and outside surfaces to avoid
corrosion.
3. In the body repair process, repair the old parts; or remove the parts with serious defects and order new parts
from the manufacturer.
4. When making body reshaping or parts welding, make sure that all main control points of the body are within
the specified scope in the design.
5. The strength and serviceability of the repaired body shall not be lower than those of the new vehicle.
6. The outside decoration of the repaired body shall meet the requirements by the new vehicle body and the
drivers in various aspects, such as modern aesthetics and ergonomics etc. (b) Apply primer
In order to prevent rust and protect the body steel plate from
being damaged by the bouncing stone, sufficient primer is
applied onto the body base and inner wheel cup.
(c) Apply antirust (wax)
In order to prevent the painting part from rusting, sufficient
antirust is applied on the engine cover, door inner corner, hinge
ambiance, or in the inside welding part of the box section
structures such as side beam, body post.Fig. 5-22 Apply the impact-proof coat on the surface paint
Impact-proof coat
Surface paint
Intermediate primer
Electrophoresis primer
Steel sheet Apply the impact-proof coat on the electrophoresis primer
Surface paint
Intermediate primer
Impact-proof coat
Electrophoresis primer
Steel sheetBody Repair -Body Damage Forms and requirements For Repair