Helical Gear PM Parts
The helix angle is a characteristic unique to helical gears and does not exist in spur gears, that is, spur gears. Generally speaking, the helix angle of the helical gear we usually refer to refers to the helix angle on the indexing cylindrical surface. The larger the helix angle, the greater the degree of overlap, which is more conducive to smooth motion and noise reduction. Everything has two sides.
Product Description
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Helical gear PM Parts |
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Item |
Material |
Production Process |
Sintering Temperature |
Mold |
Custom |
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Helical gear |
440c |
Powder metallurgy sintering |
1550°C |
To be customized |
Yes |
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Chemical composition |
C: 0.95～1.20 Si: ≤1.00 Mn: ≤1.00 S : ≤0.030 P : ≤0.035 Cr: 16.00～18.00 Ni: allowed to contain ≤0.60 |
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Available Materials |
Low carbon stainless steel, titanium alloy (Ti, TC4), copper alloy, tungsten alloy, hard alloy, high temperature alloy (718, 713) |
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There are many types of gear transmission, among which the efficiency of the helical spur gear is very high, for example, the transmission efficiency of the spur gear is lower than that of the helical spur gear. The helical spur gear is the same as the spur gear mechanism. The helical spur gear can use the method of reducing the center distance a to improve the load capacity of the transmission and can be used in high-speed operation. The helical gear reducer is a novel reduction transmission device. The helical gear reducer is small in size, light in weight, and economical.
Basic parameters
1. Helix angle: It refers to the angle between the teeth of the helical gear and the axis.
The helix angle is a characteristic unique to helical gears and does not exist in spur gears, that is, spur gears. Generally speaking, the helix angle of the helical gear we usually refer to refers to the helix angle on the indexing cylindrical surface. The larger the helix angle, the greater the degree of overlap, which is more conducive to smooth motion and noise reduction. Everything has two sides. Although increasing the helix angle brings many advantages, the axial force generated during work also increases, so The size of Helical gear PM Parts should depend on the quality requirements and processing accuracy of the work, generally take 8-25, if there are special requirements for noise, you can take a larger value according to the situation.
Distinguishing the direction of rotation of the helix: First, we make the gear axis vertical, if the height on the right side of the helix is right-handed; otherwise, the height on the left side of the helix is left-handed.
2. End face and normal face parameters:
End face: the plane perpendicular to the gear axis, the parameters on the end face are generally subscripted with t;
Normal surface: the plane perpendicular to the helix, the parameters on the normal surface are usually subscripted with n.
(1) Pitch and modulus: =t=π
(2) Pressure angle: Generally, the parameters in the legal plane are standard parameters.
a. Correct meshing conditions: the helix angles must be equal in size and opposite in direction. The legal surface modulus m and the legal surface pressure angle are required to be equal respectively.
b. Calculation of geometric dimensions: The calculation formula of spur gears can be directly applied to the end face of helical gears in the calculation because a pair of helical gears is equivalent to a pair of spur gears on the end plane.
Advantages and disadvantages
Advantage:
(1) Good meshing performance: The meshing process between the teeth of helical cylindrical gears is an excessive process, and the force on the teeth is also gradually from small to large, and then from large to small; helical gears are suitable for high speed, Overload situation.
(2) High degree of coincidence: The increase of the degree of coincidence increases the load-carrying capacity of the gear. Thereby prolonging the life of the gear. The degree of coincidence mainly depends on the meshing time, while the helical gear has a long meshing time and a large contact area, which reduces the stress. And make the transmission stable, and increase its economy.
(3) Compact structure: The smaller the minimum number of teeth, the more compact the structure.
Disadvantages and corrections:
Herringbone gears are more troublesome to manufacture.
Axial force components are detrimental to gear drives, increasing friction between devices and making them susceptible to wear or damage. The main disadvantage of helical gears is the axial component force generated when the gears mesh. The axial force is caused by the helix angle, and the greater the helix angle, the greater the axial force. In order not to make the helical gear produce excessive axial force, it is generally taken as =8~15 during design.
The herringbone gear can reduce the influence of the axial force component, but the manufacture of the herringbone gear is more troublesome. Uneconomical .
Helical gear transmission is composed of two helical gears meshing together.
Purpose: to transmit the motion between two phases in space.
Features
(1) The helical direction can change the center distance and transmission ratio;
(2) The steering can be changed by the change of the spiral rotation;
(3) fast wear;
(4) point contact;
(5) The axial force is small.
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