202101-25

BMW plans to streamline product portfolio and increase profit margins

According to reports, BMW Chief Financial Officer Nicolas Peter said that as the global economy recovers, BMW hopes to restore operating margins to pre-epidemic levels, but the large investment in electric vehicles means that the company will have to simplify its model portfolio .

202101-20

Causes of Piston Partial Cylinder Failure

The main reasons for piston bias are as follows

202101-18

What is the crankcase? Introduction to the crankcase

The lower part of the cylinder block where the crankshaft is installed is called the crankcase.

202101-13

Three layout features of the engine

The engine can be said to be the most important part of a car, and its layout has a major impact on the performance of the car.

202101-11

Chip shortage, Toyota, Ford and other auto companies have cut production

On January 8, Ford, Toyota, Fiat Chrysler Automobiles and Nissan Motors all stated that due to insufficient supply of semiconductor components, they will reduce vehicle production this month. In addition, Honda Motor also said that its car production in Japan will also be affected by semiconductor shortages.

202101-06

what is the difference between a large piston short stroke engine and a small piston large stroke engine?

For cylinders of the same displacement, what is the difference between a large piston short stroke engine and a small piston large stroke engine? This is a very important issue in the engine design stage, which is the ratio of the piston stroke to the piston diameter, also called the stroke-diameter ratio.

202101-04

Features of wet cylinder liner

The characteristic of the wet cylinder liner is that its outer surface is in direct contact with the coolant. In addition, it is thicker than the dry cylinder liner.

202012-30

Features of dry cylinder liners

The characteristic of the dry cylinder liner is that the outer surface of the cylinder liner does not contact the coolant.

202012-28

Closing a factory, Honda cuts India's automotive production capacity by 40%

According to foreign media reports, Honda Motor will cut India's four-wheel vehicle production by 40% and close a manufacturing plant.

202012-23

Disadvantages of turbochargers

Turbocharging Turbocharging can indeed increase the power of the engine, but it has many shortcomings, the most obvious of which is the lag in power output response. Let’s take a look at the working principle of turbocharging.

202012-21

The sealing mechanism of the gas ring

The piston ring has a notch and is not a circular ring in the free state. Its outer dimension is larger than the inner diameter of the cylinder. Therefore, after it is installed in the cylinder together with the piston, it generates elastic force and clings to the cylinder wall.

202012-18

V8 engine-difference in crankshaft

There are two different types of V8 engines depending on the crankshaft.

202012-14

Crankshaft wear reduction measures

When assembling the crankshaft of a diesel engine, every step must be precise. Before installing the crankshaft, clean the crankshaft and clean the crankshaft oil passage with high-pressure air.

202012-10

How will the powertrain advance through the comprehensive transformation of the automotive industry?

It is understood that with the continuous improvement of automobile energy-saving technology, the current average fuel consumption of new passenger cars in China continues to decline, and it is close to the target value of 5L per 100 kilometers in 2020. At present, a large number of high compression ratios (12-13) + Miller cycle have been applied.

202012-08

Dual Variable Valve Timing

D-VVT engine is the continuation and development of VVT, it solves the technical problems that VVT engine cannot overcome.

202012-02

The role and type of oil ring

The function of the oil ring is to evenly distribute the lubricating oil splashing on the cylinder wall when the piston moves up, which is beneficial to the lubrication of the piston, piston ring and cylinder wall;

202011-30

Piston blank forming method

The most common production method for aluminum piston blanks is the metal mold gravity casting method.

202011-25

The U.S. develops a rapid test method to evaluate the corrosion of cars protected by graphene

For automobiles, airplanes and ships, trace graphene barriers can provide decades of protection against oxygen corrosion, but how to evaluate its effectiveness has always been a challenge.

202011-23

Measurement of crankshaft clearance

The measurement of crankshaft clearance includes axial clearance measurement and main bearing radial clearance measurement.

202011-18

Piston and connecting rod assembly

Assembly operation: Apply oil to the piston pin, piston pin seat hole, and connecting rod small end bushing..

202011-16

Cylinder head assembly

Assemble the cylinder head, any repairman and driver can do it. But why is it found that the cylinder head is deformed or...

202011-11

The problem of automobile information security is becoming more serious

According to the 2020 "Automotive Information Security Report" previously released by Upstream Security, from 2016 to January 2020..

202011-09

Precautions for the use of chain guides

The chain guide has ultra-high molecular weight (molecular weight is usually over 1.5 million) polyethylene varieties.

202011-04

Piston and piston ring fault diagnosis and troubleshooting

The fit between the piston and the cylinder wall clearance is directly related to the engine's maintenance quality and service life.

202011-02

Crankshaft inspection methods and requirements of engineering cranes

Crankshaft maintenance methods and requirements of engineering cranes: