We all know that the chassis consists of four major systems: transmission, driving, steering, and braking. It is an important part of the entire vehicle, with many parts and wide distribution. So we're having trouble judging.

Why the chassis rang

Under normal circumstances, there are roughly the following types of reasons for the different sounding of the chassis:

1) Interference between parts and components

Possible causes: Interactions between the two components due to impact or the installation of other equipment.

Solution: Interference between components can only be achieved through orthopaedic repair or replacement of related components.

2, bolt or nut loose

Possible reasons:

A, long-term in the road where the road conditions are relatively poor, the bolt naturally loosens;

B, improper demolition and installation of the bolt damage;

C, the tightening moment is not enough or the bolt specification is not correct.

Solution: Fasten or replace bolts and nuts.

3, transmission shaft cardan failure

Possible causes: Dust-proof cover rupture or oil spill caused by failure to repair in time

Solution: replace new drive shaft cardan

4, the head of each ball, suspension, connection support damage caused by different sounds

Possible causes: malfunctions caused by loose ball heads or broken rubber liners after prolonged use

Solution: replace new ball heads or support pads

5, brake system noise

Possible reasons:

A, brake pad, brake clamp or bracket loose;

B, brake plate or brake disc failure;

Solution: check whether the braking system is loose, and whether the brake plate and brake disc have abnormal wear.

6, hub bearings ring

At a certain speed, there is a "buzzing" sound and it increases with the increase in speed.

Possible causes: mostly due to hub bearing ablation.

Solution: Replace new hub bearings. (Both sides are recommended to be replaced at the same time)

7, tire noise

Possible reasons:

A, tire itself problem

Abnormal tire wear

Solution: Check the tire for abnormal wear and tear, check if the chassis is loose and improperly assembled, etc.. If not, it is the tire itself.

8, transmission noise

Possible causes: Internal gear wear or less oil

Solution: First check whether the transmission lubricant is sufficient, if there is no external failure, can only be unpacked inspection.

9, clutch noise

一般为踩下离合踏板后会有异响

可能原因：分离轴承少油磨损所致

解决办法：更换新的分离轴承

异响产生的范围

>>1、打方向时底盘异响

一般查看是不是外球笼坏了或者拉杆球头活动量过大。

>>2、踩刹车或离合器踏板时异响

踩刹车时异响，如果是很刺耳的声音首先应检查刹车片是否磨到底了，再检查刹车盘是否光滑平整；如果是哐当响，则检查刹车机构是否出现松动，下摆臂球头是否坏了。

When stepping on the clutch, it is usually a separate bearing that is broken and needs to be replaced in time.

3, overspeed belt chassis noise

This is the most commonly encountered, and the range involved is also more extensive. It is generally the interference between parts, bolt nut loosening and shock absorber damage without oil.

4, change the signal when changing gear

If the gear change is different, first should check whether the clutch is stepped to the end, whether the cable adjustment is appropriate, whether the clutch is completely separated, otherwise it is likely that the Synchronizer inside the transmission is broken.

5, speed when the chassis ring

Generally, a part screw is loose or the rubber bracket is damaged. There are common damage to the engine leg and damage to the transmission leg.

6, travel different sounds

More common is damage to hub bearings, as well as tire noise.

Method of Inspection

For the chassis ring, I personally summed up a method is: listen, shake, look and change

Listen: the general part of the hearing noise;

Shake: Shake parts to see if it is loose;

Look: see if there are traces of friction or collision on the parts;

Change: If there is no direction, it can only be replaced with a replacement method, replacement of suspected parts, to reduce the scope of the failure.

The above introduction is a specific fault diagnosis method, telling everyone to encounter the chassis to "how to do." But in order to satisfy some of our more inquisitive partners, we want to tell him "why," so we have a systematic knowledge of the principle of sorting the chassis. The careful little friend may have noticed that we have already had several more issues of the "chassis" article. This issue is about the "car bridge" section.

Bridge.

&; Gt; &; Gt; 1, what is the bridge?

The axle(also known as the axle) is connected to the frame(or load-bearing body) through a suspension and the wheels are installed at both ends.

The other value is that the sub-frame can be seen as the skeleton of the front and rear axle and is part of the front and rear axle. The sub-frame is not a complete frame, but it supports the front and rear axle and the suspension bracket.

2, the role of the bridge

The role of the bridge is to bear the load of the car and maintain the normal movement of the car on the road.

Note: It is the suspension, not the bridge, that transmits the force and torque between the frame and the wheel.

3, classification of vehicles and bridges

We call it the front bridge and the back bridge.

According to the different driving methods, the bridge is also divided into four types: steering bridge, driving bridge, steering drive bridge and support bridge.

&; Gt; Steering bridge

The steering bridge refers to the bridge that undertakes the steering task.

Note: The general car is the front bridge to undertake the steering task. The front and rear bridges of the four-wheel steering car are all steering bridges.

Drive Bridge

The drive bridge refers to the mechanism that transmits the speed and torque from the transmission and then passes them to the drive wheel.

Steering drive bridge

The steering drive bridge refers to the mechanism that not only undertakes the steering task but also undertakes to transfer power to the drive wheel.

Support Bridge

The support bridge refers to an institution that neither undertakes the steering task nor undertakes the transmission of power to the drive wheel.

The front-drive front bridge is a steering drive bridge, and the rear bridge is a support bridge; Front and rear drive, front bridge for the steering bridge, rear bridge for the driving bridge.

The most common faults of the bridge are deformation and fracture, and some faults caused by displacement wear. Everyone should check the gap between chassis connectors or buffers if there is a problem. For example, the main pin gap is too loose or the buffer glue of the lateral stability bar brings different sounds.