The 1st Period of Chaichefang analysis of Cruze and Civic

2011-10-17 Chengbin Liu 中文版

The 1st Period of Chaichefang analysis of Cruze and Civic

  “The 1st Automobile Deconstruction” event sponsored by chexun.com on Dec. 17, 2011, has attracted wide attention. From Dec. 2012, Chaichefang column will release an issue every month. In each period, two hot-sell batch-manufactured car models that are bought by chexun.com fully at its own expense will be deconstructed. The whole test and deconstruction process will be carried out by experts and professors of Department of Automobile Engineering, Tsinghua University, and the test report of each period will be published . The car models deconstructed in the 1st period of Chachefang are Civic of 9th generation and Cruze. Let’s see the deconstruction results .

The 1st Period of Chaichefang analysis of Cruze and Civic

  Full process of Civic deconstruction

The 1st Period of Chaichefang analysis of Cruze and Civic

  Full process of Cruze deconstruction

 

Civic of 9th generation

Cruze

Displacement

1.8L

1.6L

Model

2012 1.8L EXi manual comfort version

2011 1.6L SL manual version

Gearbox

5-speed manual

5-speed manual

Date of Manufacture

Nov. 2011

Oct. 2011

VIN

LVHFB2548C5006043

LSGPC52U5AF272288

Mileage

452km

262km

MSRP

131,800 yuan

108,900 yuan

Actual Buy Price

126,800 yuan

97, 400 yuan

Prepared by www.chexun.com

  Part 1: Body Structure

  Comparison of Front and Rear Bumpers

  The 1st Period of Chaichefang analysis of Cruze and Civic

Civic’s front bumper adopts a compressible metal structure which can protect pedestrians during collision, but there is no protective material in the bumper shell.

The 1st Period of Chaichefang analysis of Cruze and CivicThe 1st Period of Chaichefang analysis of Cruze and Civic

  Civic’s front bumper of Civic is composed of two layers of iron. In collision, the outer layer of iron will be the first to play a role of deformation and energy absorption and the inner layer has greater thickness and strength than the outer layer. This design enables a gradual absorption of energy in head-on collision so as to reduce the destruction to the car body, but there is no protective material in the bumper shell. Civic’s rear bumper adopts a metal material but the structure is as simple as to have only a beam connecting with the body in a very simple way. When the car encounters a rear-end collision, the buffer effect may not be evident and the impact may directly be transferred to the body, brining danger to the passengers on the back row.

  The 1st Period of Chaichefang analysis of Cruze and Civic

Cruze’s front bumper adopts a steel beam and there is energy-absorbing foam material in the bumper shell, protecting pedestrians in collision to certain extent.

The 1st Period of Chaichefang analysis of Cruze and CivicThe 1st Period of Chaichefang analysis of Cruze and Civic

  Cruze’s front bumper adopts a steel beam, which can absorb energy in impact to reduce the deformation of engine compartment to certain extent. There is energy-absorbing foam material in the bumper shell, which can play a greater role than in Civic case in protecting pedestrians in collision. Cruze’s rear bumper adopts profiled aluminum alloy and is connected with the body in a simple way. Such design can give greater buffer in right read-end collision so as to reduce the injure to the passengers on the back row. But the disadvantage is also very evident as there is hardly an energy-absorbing buffer zone when the care is collided from both left and right sides.

  The expert pointed out that the front bumpers of both Civic and Cruze have an anti-impact steel beam for protecting the car body and moreover, they are of the similar structure. Cruze uses foam material in its bumper shell, which is not considered in Civic. Besides, Cruze has also designed a deformable plastic energy-absorbing bar below the front steel beam, providing a dual protection for pedestrians. It can be said that, in the comparison of this part, Cruze outperforms new Civic.

  Comparison of Wheel Fender Interior

  The 1st Period of Chaichefang analysis of Cruze and Civic

In the interior of Cruze wheel fender, the space between welding points is around 5cm,indicating a not very high density. Other connection points use screws which are easy to break in collision. The body steel panel adopts an energy-absorbing crumple design, which plays a role of deformation and energy absorption in collision.

  The 1st Period of Chaichefang analysis of Cruze and Civic

Civic also adopts the same welding mode, the body rigidity is not very high and the deformation and energy absorption is evident after collision. It is felt that the steel plate is not so thick as that of Cruze.

  Wheel fenders mainly play a role of energy-absorption in collision and therefore, their thickness and strength are not very high. After removing the wheel fenders of these two car models, we saw the car frame structure. The welding points of both cars looked not very dense, with the space between them being about 5cm. The energy absorbing design of the steel plates were very evident. Don’t look down upon these channels on the steel plates: these small energy absorbing zones can play a great role of energy absorption in collision.

  Comparison of A, B and C Columns between Civic and Cruze

The 1st Period of Chaichefang analysis of Cruze and CivicThe 1st Period of Chaichefang analysis of Cruze and Civic

The 1st Period of Chaichefang analysis of Cruze and CivicThe 1st Period of Chaichefang analysis of Cruze and Civic

The 1st Period of Chaichefang analysis of Cruze and CivicThe 1st Period of Chaichefang analysis of Cruze and Civic

  Left:Cruze                Right:Civic

  Remove the decoration plates of A, B and C columns and you will see their interior structure. A, B and C columns are the main part supporting the car structural strength. Therefore, any trace of cheating on workmanship and materials must not exist in these places. From the pictures, you can see the width of these columns and their stamping process meet the requirements. It was felt by touching that the strength of the steel plates in these places were very high. In fact, an accurate conclusion for the definite structure of these columns should be made after further cross-section experiments. However, it is known from visual inspection that the A column of Civic has a three-layered reinforcing structure while B and C columns do not have an interior reinforcing structure. Curze’s B column has an interior reinforcing steel beam structure while it is evident that A and C columns has no any additional structure.

  Comparison of Interior Structures of Doors

The 1st Period of Chaichefang analysis of Cruze and Civic

Cruze’s door panel uses very little sound-proof material, the water-proof plastic is only a very thin layer and the window glass lifter is a dual-support structure. There is a circular anti-impact beam between two steel plates.

The 1st Period of Chaichefang analysis of Cruze and CivicThe 1st Period of Chaichefang analysis of Cruze and Civic

  Cruze’s front door has an anti-impact beam and there are three layers of sealing strips around the door. But the door panel has no special structure and there is no other noise-reducing material in its interior decoration panel, making it hard to depress the noise at high speed . In addition, the waterproof layer in the door panel uses plastic coverage of low cost, and such coverage has to be replaced when the door panel is repaired.

The 1st Period of Chaichefang analysis of Cruze and Civic

Civic’s door panels are rather adequate in terms of sound proofing. The interior decoration panels of doors are covered with large area sound insulation cotton and the waterproof plastic of doors is covered by a layer of sound-absorbing material. The glass lifters adopt a single support structure. The interior of the steel door panels also use a circular anti-impact steel beam.

The 1st Period of Chaichefang analysis of Cruze and CivicThe 1st Period of Chaichefang analysis of Cruze and Civic

  Civic’s door panels are rather adequate in terms of sound proofing. The interior decorative panels of doors are covered on a large area with sound insulation cotton and the waterproof plastic of doors is covered by a layer of sound-absorbing material. The glass lifters adopt a single support . A circular anti-impact steel beam is also used in the interior of the steel door panel. What is worth attention is that the lifting and lowering of window may lead to a slight deformation of the interior decorative panel of door. However, it has little impact on safety.

  ComparisonofSteeringColumns

  The 1st Period of Chaichefang analysis of Cruze and Civic

Cruze’s steering column adopts a partial crumple design and the arrow-pointed part is the deformable zone.

  The 1st Period of Chaichefang analysis of Cruze and Civic

Civic’s steering column is also of crumple design and the advantage of such design is that it can protect driver’s chest and head in collision.

  In serious impact of car, the driver will often lean forward due to a strong stop and the human chest will collide with the steering wheel. In order to reduce the impact on driver’s chest by the impact of steering column. In some cars, the steering column may be designed to crumple into two or three sections when squeezed by external impact so as to disperse the impact transferred to the human body by the steering column, which generally occurs only in a strong impact. Civic adopts a crumple design to reduce the injure of driver’s chest in collision. Such design, though simple, can significantly improve safety. Cruze adopts a partial crumple design and uses partial plastic in its connecting part, which is simple in structure but has no evident role in protecting driver’s chest in collision.

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