Where is the balancer shaft in What is the balancer shaft used for?

Above the tires of the car. Balanced head axle technology is a widely used technology in motorcycle engines, its structure is simple and practical, can effectively reduce the vibration of the whole vehicle of the motorcycle, improve the comfort of driving.

Balance shafts can be divided into two types: single balance shaft and double balance shaft. As the name suggests, the single balancer shaft uses a single balancer shaft and utilizes a gear drive.

way to carry out the work, through the crankshaft.

The rotation drives the fixed balancer shaft drive gear, the balancer shaft driven gear and the balancer shaft. The single balancer shaft can balance the first-order vibration, which accounts for a considerable proportion of the total vibration, so that the vibration of the engine can be significantly improved.

The principle of engine vibration.

When the engine is in working condition, the piston moves very fast and unevenly. When the piston is in the top and bottom dead center position, its velocity is zero, but the speed is highest in the middle of the top and bottom dead center. Since the piston makes repeated high-speed linear motion in the cylinder, it will inevitably generate large inertial forces on the piston, piston pins and connecting rods.

While the counterweight on the connecting rod effectively balances these inertial forces, only one part of the moving mass is involved in linear motion and the other part is involved in rotation. Therefore, except for the top and bottom dead center positions, other inertial forces cannot fully reach the equilibrium state, and the engine vibrates at this time.

The function of the balance shaft: to make the engine work more smoothly and smoothly. Here's an introduction to the balance shaft:

1.Introduction: Balance shaft technology is a widely used technology in the engine, the structure is simple and practical, which can effectively alleviate the vibration of the whole vehicle of the motorcycle and improve the comfort of driving.

2.Classification: There are two types of balance shaft methods used in the engine: double balance shaft and single balance shaft.

The single balancer shaft works by using the gear transmission mode, and drives the fixed balancer shaft drive gear, the balancer shaft driven gear and the balancer shaft through the rotation of the crankshaft; The double balance shaft adopts a chain drive mode to drive the two balance shafts to rotate.

The balancer shaft can improve the smooth operation of the engine. Many mountain engines are fitted with a balancer shaft, and some have more than one balancer shaft.

The cylinder of the automobile engine has only one stroke to do work, and the other three strokes need to rely on inertia, so the power output of the engine is not smooth enough, so the engineer invented the balance shaft.

Many three-cylinder engines have a balancer shaft.

The three-cylinder engine is not as comfortable as the four-cylinder engine due to its structure. In order to improve the ride comfort of the three-cylinder engine, engineers installed a balancer shaft on the three-cylinder engine.

The balancer shaft is not only used in three-cylinder engines, but also in many large-displacement multi-cylinder luxury cars, which can improve the quietness and driving quality of the car.

The balance shaft is connected to the crankshaft, which can reduce the vibration and noise of the engine.

A balancer shaft is an axle with some counterweights on it. When the engine is running, the balance shaft also operates, which compensates for some of the vibrations.

In fact, the ride comfort of the three-cylinder engine used in the new car is very good, and the car with the three-cylinder engine does not feel noticeable jitter and noisy treble in the car.

The three-cylinder engine can only feel noticeable shaking at the moment of starting, which greatly affects comfort.

Engineers are also using various technical means to improve the ride comfort of the three-cylinder engine.

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Balancer shaft technology is a simple and very practical engine technology, which can effectively reduce the vibration of the whole vehicle, improve the driving comfort, and make the engine work more smoothly and smoothly.

The balancer shaft makes the engine work more smoothly and smoothly. Balancer shaft technology is a simple and very practical engine technology, which can effectively reduce the vibration of the whole vehicle and improve the driving comfort.

The role of the balance shaftMake the engine work more smoothly and smoothly.

The principle of vibration of the engineDuring the duty cycle of the engine, the piston moves very fast and at a very uneven speed. At the top and bottom dead center position, the speed of the piston is zero, while the speed reaches its highest in the middle of the top dead center. Due to the repeated high-speed linear motion of the piston in the cylinder, a large inertia force must be generated on the piston, piston pin and connecting rod.

The counterweight configured on the connecting rod can effectively balance these inertial forces. But the counterweight on the connecting rod only has one part of the moving mass that participates in linear motion and the other part that participates in rotation. In addition to the top and bottom dead center positions, various inertial forces cannot be perfectly balanced, causing the engine to vibrate.

When the piston moves up and down every time, the engine will vibrate once, up and down, so the vibration frequency of the engine is related to the speed of the engine. In the theory of vibration, multiple harmonic vibrations are often used to describe the vibration of the engine, in which the vibration frequency and the engine speed are the same is called the first-order vibration, and the frequency is twice the engine speed Sun Xiyin is called the second-order vibration, and so on, there are also third-order and fourth-order vibrations. However, the higher the vibration frequency, the smaller the amplitude, and the above 2nd order is negligible.

Its first-order vibration accounts for more than 70% of the entire vibration and is the main vibration.

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When repairing a single-cylinder diesel engine, it is necessary to pay attention to eliminating the cause of the breakage of the balance shaft. The causes of the breakage of the balance shaft are summarized as follows:

a) Loose bearings. The so-called balance shaft bearing is loose, and the common reasons for abnormal wear of the seat hole are poor engine balance, inflexible operation of the flow bearing, excessive coaxiality of the seat hole at both ends of the balance shaft, and excessive axial clearance of the balance shaft. As the wear of the housing bore increases, the running balance bearing is subjected to excessive shock loads, resulting in the breakage of the balance shaft.

b) Misassembly. In the process of disassembly and maintenance of diesel engine, sometimes the balance shaft is installed incorrectly, such as the timing mark is installed incorrectly when installing the timing gear. At this time, the balance shaft not only cannot play a balancing role, but will cause greater vibration, resulting in the fracture of the balance shaft.

3) Poor gear meshing. The balance of the axis of the balance shaft gear and the gear meshed with it is out of tolerance, and the meshing gear is stuck in the transmission process, so that the balance shaft is subjected to periodic bending stress, resulting in fatigue fracture of the balance shaft.

1. Double balance shaft mode:

The double balance shaft adopts a chain drive mode to drive two balance shafts to rotate, one of which is the same speed as the engine, which can eliminate the first-order vibration of the engine; The other balancer shaft rotates twice the speed of the engine, which can eliminate the second-order vibration of the engine and achieve the ideal damping effect. The double balancer shaft method is more complex, costly, and occupies a large space in the engine, which is generally used on large-displacement motorcycles.

There is also a double balance shaft arrangement, that is, the two balance shafts are arranged symmetrically with the center line of the cylinder, the direction of rotation is opposite, and the speed is the same as the crankshaft speed, so as to balance the first-order reciprocating inertia force of the engine. For example, the balancer shaft on the 276Q engine is arranged as above.

2. Single balance shaft mode:

The single balance shaft adopts a single balance shaft, which works by gear transmission, and drives the fixed balance shaft to drive the gear through the rotation of the crankshaft - > the balance shaft driven gear - > balance shaft. Single balance can balance the first-order vibration, which accounts for a considerable proportion of the entire vibration, and can significantly improve the vibration of the engine. Due to the simple structure of the single balancer shaft and the small space it occupies, it is widely used in single-cylinder and small-displacement engines.

The switch inlet and outlet valves, as well as the oil state, has a balance shaft is a push rod transmission, and no balance shaft is a chain drive.

It is a critical vibration that occurs when the engine is working.

To put it bluntly, it's about reducing vibrations.