What is a non fully supported crankshaft in an automobile?

<> fully supported crankshaft.

The number of main journals of the crankshaft is one more than the number of cylinders, that is, there is a main journal on both sides of each connecting rod journal. For example, a six-cylinder engine has seven main journals for the fully supported crankshaft. Four-cylinder engines have fully supported crankshafts with five main journals.

With this kind of support, the strength and stiffness of the crankshaft are relatively good, and the load on the main bearing is reduced, and the wear is reduced. Diesel engines and most gasoline engines.

This form is mostly used. Introduction: The crankshaft is the most important component in the engine. It takes the force from the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine to work. The crankshaft is subjected to the centrifugal force of the rotating mass.

The inertial force of a gas that varies periodically.

The joint action of the reciprocating inertial force makes the crank bearing subject to the action of bending torsional load. Therefore, the crankshaft is required to have sufficient strength and rigidity, and the surface of the journal needs to be wear-resistant, uniform and balanced. There are generally two types of crankshaft support, one is fully supported crankshaft, and the other is non-fully supported crankshaft.

The main journal is the supporting part of the crankshaft, which is supported in the main bearing housing of the crankcase by the main bearing. The number of main bearings depends not only on the number of engine cylinders, but also on how the crankshaft is supported. There are generally two ways to support crankshafts:

One is a fully supported crankshaft and the other is a non-fully supported crankshaft. Fully supported crankshaft: The number of main journals of the crankshaft is one more than the number of cylinders, that is, there is a main journal on both sides of each connecting rod journal.

For example, a six-cylinder engine has seven main journals for the fully supported crankshaft. Four-cylinder engines have fully supported crankshafts with five main journals. With this kind of support, the strength and stiffness of the crankshaft are relatively good, and the load on the main bearing is reduced, and the wear is reduced.

Diesel engines and most gasoline engines mostly use this form. Non-fully supported crankshaft: The number of main journals of the crankshaft is less than or equal to the number of cylinders.

This support method is called non-fully supported crankshaft, although the main bearing load of this support is larger, but the total length of the crankshaft is shortened, so that the overall length of the engine is reduced. Some gasoline engines can use this crankshaft type with a smaller load.

<> according to the number of main journals of the crankshaft, the crankshaft can be divided into two types: fully supported crankshaft and non-fully supported crankshaft; According to its structural form, it can be divided into three types: integral forging, integral casting and combination; According to different materials, it can be divided into two kinds: ductile iron and steel, and the function of the crankshaft is to turn the thrust from the piston connecting rod into a rotating torque, and balance the weight"It is an astronomical term. The copyright of the Chinese translation of the proper noun from the Chinese Astronomical Terminology Examination and Approval Committee, the translation of the entry and the Chinese and English interpretation data are owned by the Astronomical Terminology Committee, which turns the reciprocating linear motion of the piston into a circular rotation of the crankshaft, and then transmits the engine torque to the transmission system through the flywheel; It also drives the engine's valve train and other auxiliary devices.

The number of main journals of automobile crankshaft is less than the number of cylinders or the same as the number of cylinders, and this support method is called non-fully supported crankshaft. Although this support is loaded on the main bearing, the crankshaft is mainly composed of the front end of the crankshaft (or free end), the connecting rod journal, the main journal, the crank, the balance weight, and the rear flange (or power output) of the crankshaft. The front end of the crankshaft is equipped with a crankshaft timing gear, and the rear end is equipped with a flywheel (some engines also have a balance weight).

The number of main journals of the crankshaft is more than the number of cylinders, that is, there is a main journal on both sides of each connecting rod journal. With this support, the strength and stiffness of the crankshaft are better, and the load on the main bearing is reduced, and the wear is reduced. Diesel engines and most gasoline engines mostly use this form.

The fully supported crankshaft of the V-shaped engine can be divided into full-supported slag-bearing crankshafts and non-fully-supported crankshafts according to the support mode of the crankshaft

1. Fully supported crankshaft is called fully supported crankshaft. The total number of main journals (including the main journals at the front and rear ends of the crankshaft) is one more than the number of cylinders in the fully supported crankshaft of an in-line engine, and the crankshaft is not fully supported. In the adjacent two twists asked.

Diesel engines mostly use fully supported crankshafts, and the total number of main journals is one more than half of the number of cylinders. The advantage of a fully supported crankshaft is that it increases the stiffness of the crankshaft and reduces the load on the main bearing.

2. Its disadvantage is that the number of main bearings of the crankshaft is large, and the size of the body is long. In the adjacent two cranks, a main journal is nailed to the crankshaft.

Each cylinder is supported by two support shafts.

Brother also tested the automobile structure, brother built bridges, are you too?

According to the support mode of the crankshaft, the crankshaft can be divided into two types: fully supported crankshaft and non-fully supported crankshaft. zhi

1. Fully supported crankshaft. DAO is located on two adjacent crankshafts, nailing a main journal of the crankshaft, which is called a fully supported crankshaft. The total number of main journals (including the main journals at the front and rear ends of the crankshaft) is one more than the number of cylinders in the fully supported crankshaft of an in-line engine; The V-shaped engine has a fully supported crankshaft, and the total number of main journals is one more than half of the number of cylinders.

The advantage of a fully supported crankshaft is that it increases the stiffness of the crankshaft and reduces the load on the main bearing. Its disadvantage is that the number of main bearings of the crankshaft is large, and the size of the body is long. Diesel engines mostly use fully supported crankshafts.

2. Non-fully supported crankshaft. In the case of two adjacent crankshafts, the crankshaft without one main journal is connected, it is called a non-fully supported crankshaft.

Combination copying.

The main rotating part of the engine, when the connecting rod is attached, can accept the up and down (reciprocating) motion of the connecting rod and turn it into a cyclic (rotating) motion. It is an important part of the engine, and its material is made of carbon structural steel or ductile iron, and has two important parts: the main journal, the connecting rod journal, (and others).

The main journal is installed on the cylinder block, the connecting rod journal is connected with the connecting rod big head hole, and the connecting rod small head hole is connected with the cylinder piston, which is a typical crank slider mechanism. The lubrication of the crankshaft mainly refers to the lubrication of the connecting rod bearing and the crankshaft connecting rod journal and the lubrication of the fixed points at both ends. The rotation of the crankshaft is the power source of the engine.

It is also the source power of the entire mechanical system.

The engine crankshaft is generally fully supported.

It should not be called a support type, it should be called a combined type, and the crankshaft is sandwiched between the main bearing and the body.