With regard to the gear meshing overlap coefficient, the gear to gear meshing clearance

The condition of continuous gear transmission is that the overlap coefficient is greater than or equal to one, that is, the actual meshing line of the grain tooth should be greater than or equal to the base section (law section) of the gear.

As long as it is greater than or equal to one, there must be a tooth in the meshing state.

Less than a moment, when the previous gear tooth is out of mesh, the latter wheel tooth does not enter the mesh, so that the transmission is interrupted, and the impact between the gear teeth is caused when re-entering the mesh, which affects the transmission stability.

Theoretically, when equal to one, the previous tooth has just been out of mesh, and the next tooth has just been in a meshing state.

When the overlap coefficient is greater than 1 and less than 2, the first tooth is meshed, and the next tooth is also meshed.

When the overlap coefficient is equal to 2, the first tooth has just been out of mesh, and the third tooth has just entered the meshing state.

It's not that there are two rounds of tooth meshing when it's an integer.

Because the engineering takes into account the license and assembly error of the gear, the overlap coefficient is generally taken.

The overlap coefficient is not always changing, it is calculated by the formula, the overlap coefficient is 1, that is, only after a pair of teeth completes the meshing, the other pair of gear teeth begins to enter the meshing state, so that there is an intermittent gear transmission and the transmission is unstable; If the overlap coefficient is 2, it means that there are 2 pairs of teeth entering the meshing state at the same time, so that the gear will be stuck.

In summary, the overlap coefficient of the gear is calculated between 1 and 2. Sometimes, however, in order to juxtapose the coefficients neatly, it can also be considered to be 2. (However, the actual overlap coefficient of the gears is not 2, just for the purpose of calculation and checking).

The meshing clearance between gears refers to the clearance or spacing when the tooth surfaces of the gears are in contact. This clearance is set to ensure that the gears can run smoothly.

The size of the mesh gap is determined according to the design requirements of the gear and the application used. In general, the meshing gap should be as small as possible to ensure the efficiency and accuracy of the gear when transmitting power. However, a certain level of clearance is necessary to take into account factors such as thermal expansion, lubrication, etc., during the manufacture and installation of the wheel.

The setting of the mesh gap involves the geometric parameters of the gear, including the modulus, tooth thickness, number of teeth, etc. Normally, designers will select the appropriate engagement gap based on specific application needs and realities. In engineering, there are empirical formulas to refer to, but best practices still need to be supported by experience and real-world testing.

It should be pointed out that too large or too small a mesh gap can cause problems with the gearing. Excessive clearance may lead to excessive vibration and noise, reducing transmission efficiency and accuracy; Gaps that are too small can lead to excessive friction and wear of gears, exacerbating wear and tear on equipment and shortening its service life.

Therefore, in order to ensure the normal operation and service life of the gear collision group, it is recommended to follow the relevant standards and specifications in the specific design, and test and optimize according to the actual situation. <>

The basic meshing parameters of gears include modulus, pressure angle, number of teeth, tooth profile and meshing angle. Among them, the modulus is an important parameter of the gear, which is used to describe the number of gear teeth and the basic parameter of the meshing between gears and gears, which is usually expressed by m. The larger the modulus, the larger the contact area of the gear during meshing, and the greater the power transferred.

The size of the module is generally determined by the working conditions and requirements of the gear drive.

Another important parameter is the pressure angle. The pressure angle is the angle between the tooth profile of a spur or helical gear and the axis of the gear, which is usually expressed by . The magnitude of the pressure angle affects the smoothness and noise of the gear mesh.

In general, the greater the pressure angle, the better the meshing smoothness of the gear, but the more difficult it is to manufacture.

The number of teeth is one of the important parameters of gears. It directly affects the meshing conditions and transmission ratios of the gears. The more the number of teeth, the larger the gear, the better the meshing conditions, and the smaller the transmission ratio. However, the increase in the number of teeth will also lead to the loss of gear material and the increase in manufacturing costs.

Tooth profile is one of the important parameters of gears, which determines the meshing form and meshing conditions between gears. There are two main types of tooth profiles: geometric tooth profiles and solid tooth profiles. The geometric tooth profile refers to the constituent line shape of the gear tooth profile, and the solid tooth profile refers to the physical shape of the gear tooth profile.

Different tooth profile shapes determine the different characteristics of the gear.

The meshing angle is also one of the important parameters of the gear, which is the angle between the tooth surface and the tooth top of the gear. The size of the engagement angle determines the contact conditions during gear meshing, which directly affects the performance and service life of the gear transmission. The size of the meshing angle should be selected according to the specific situation, generally between 20 degrees and 30 degrees.

To sum up, the basic meshing parameters of gears include modulus, pressure angle, number of teeth, tooth profile and meshing angle, etc., and the size and selection of these references should be determined according to the working conditions and requirements of gear transmission. <>

The calculation of the coincidence degree is the ratio of the actual meshing line to the normal tooth pitch, and the =[z1(tan a1-tan')z2(tanαa2-tanα'2) z1, z2 is the number of teeth; a1 and a2 are the pressure angles of the tooth top circle'is the meshing angle. )。If it is a helical gear, in addition to this end face coincidence degree, there is also an axial coincidence degree =bsin (m) (b is the tooth width and durability, is the helix angle, and m is the normal modulus).

It shows that the actual length of the meshing line has 2 base circle pitches, and the decimal part indicates that there are 25% more base circle pitches. Therefore, 25% of the time the gear is meshed with 3 teeth and 75% of the time with 2 teeth.

1. Two gears that are occluded to each other, the tooth ratio is 3:2, if the large gear has 48 teeth, the pinion has (32) teeth.

2. Two gears that are in occlusion with each other, if the ratio of the number of teeth of the large and small gears is 5:4, the large gear should rotate 100 times, and the small gear should rotate (125) turns.

3. The diameter of the front wheel of a bicycle is, and it is ( ) meters forward in one turn.

When the gears are meshed outward, the rack with the greatest degree of overlap is the rack. When the gear is meshed internally, the degree of overlap is the largest when the drum tooth is connected. In doing harmonic transmission, there is half of the tooth meshing.

Therefore, there is no range of coincidence of gear meshing, which can be selected according to needs. Answer:

The degree of coincidence can be equal to sixteen. Hehe.

"The number of teeth is 20,60, the pressure angle is 20,m=2" – if, this is a standard spur gear, the degree of coincidence is calculated.

Generally, the degree of overlap is around the right, which can meet the use.

Is there a range of coincidence of gear meshing" - spur tooth external gear, the degree of coincidence will not be greater than 2; The coincidence degree of helical gears (external gears) is generally greater than 2, and the maximum can be about 4.

Can it be equal to sixteen" - impossible.

In the manual, the formula for calculating the degree of coincidence of spur gears is available. The formula is long.

If you ask within a base circle tooth distance, the time ratio between the two is the high-step answer, and if you only ask the time ratio alone, it is a double tooth and a single tooth.

This dude, you can't stop talking nonsense!! Divide it to double teeth.

The proportion of two-tooth engagement (time) is 30%, and the proportion of single-tooth engagement (time) is 70%.