Wear-Resistant Stable Precision Large Alloy Steel Bevel Gear Wheel
Overview
| Model | Alloy Steel Stable Gear Wheel |
| Type | Round/Worm gear/bevel/Non-round /Rac Plastic stainless steel |
| Tooth shape | spur/bevel/curve/double gear |
| Production type | Casting/cutting/rolling/sintered gear |
| Wrapped | wooden box |
Application scope
| textile, agriculture, mining, food, oil and other transmission
machinery |
| Hardness | hardening |
| MOQ | ≥100 pieces |
product introduce
| Name | Wear-Resistant Stable Precision Large Alloy Steel Bevel Gear Wheel |
| Machining module | 0.2-10 |
| Materials: | stee45#l, 40CR, Easy car iron (1214#), brass, tin bronze,
POM(Sisteel), PVD, PVDFl, imported nylon, stainless steel 303#,
stainless steel 304#, aluminum 606#, aluminum 6063# |
Surface treatment: blackening, | high frequency, carburizing and quenching, surface nitriding, etc |
| Processing equipment: | CNC lathes, automatic lathes, general lathes, hobbing machine, gear
shaper, gear milling machine, shaving machine, milling machine,
grinding machine, wire cutting, etc |
| Processing technology | hobbing, gear, shaving, milling teeth |
| |
The basic introduction of gears
Gear; A mechanical component with teeth on the rim that can
continuously engage to transfer motion and power is a mechanical
component with teeth that can mesh with each other. The diameter of
the big gear is twice that of the small one. If the big gear does
not move, how many times does the pinion revolve around the big
one? Conversely, if the pinion does not move, how many times does
the big pinion revolve around the pinion? The big gear does not
move, the small gear along the big gear revolution one week, the
small gear rotation one week; When the pinion does not move, the
big gear rotates once around the pinion, and the big gear rotates
once and a half, i.e., once at 240°, once and a half at 360°, two
times at 480°, and three times at 720°.
Gear is a mechanical part with teeth that can mesh with each other.
It is widely used in mechanical transmission and the whole
mechanical field. Modern gear technology has reached: gear modulus
0.004 ~ 100 mm; Gear diameter from 1 mm to 150 meters; Transmission
power up to 100,000 kilowatts; Speed up to hundreds of thousands of
RPM; The highest circumferential speed is 300 m/s.
Structure classification
Generally there are tooth, tooth groove, end face, surface, tooth
top circle, tooth root circle, base circle, indexing circle.
tooth
The tooth, referred to as tooth, is each convex part on the gear
used for meshing. These convex parts are generally arranged
radially, and the teeth on the matching gear are in contact with
each other, so that the gear can keep meshing operation.
The cogging
Is the space between two adjacent teeth on a gear; The end face is
a plane perpendicular to the axis of a cylindrical gear or worm.
End face
Is the plane at each end of the gear.
Method of surface
Refers to the plane perpendicular to the tooth line.
Addendum circle
The circle at the top of the tooth.
Dedendum circle
It's the circle at the bottom of the trough.
Base circle
The generating line that forms the involute as a pure rolling
circle.
Dividing the circle
It is a reference circle for calculating the gear geometry in the
end face
Role of gears
Gear is a mechanical part with teeth that can mesh with each other.
The application of gear in transmission appeared very early. At the
end of the 19th century, the development of the principle of tooth
cutting method and the use of this principle of tooth cutting
special machine tools and tools have appeared, with the development
of production, the smoothness of gear operation by attention. The
role of gear is to transfer the rotation of one shaft to another
shaft, but also to achieve deceleration, increase, change and
reverse action.
The main parameters
The number of teeth Z
Closed gear transmission generally has a high speed. In order to
improve the smoothness of transmission and reduce the impact
vibration, it is better to have more teeth. The number of teeth of
pinion is z1=20~40. Open-type (semi-open-type) gear transmission,
because the tooth is mainly wear failure, in order to make the gear
is not too small, so the pinion should not choose too many teeth,
generally desirable Z1 =17~20.
Spiral Angle
Beta & gt; 0 is left-handed;
Beta & lt; 0 for a right-handed
pitch
Pn = PTCOS β(subscripts n and t denote normal and end face marks
respectively)
The modulus
Modulus refers to the ratio of the pitch p between the same tooth
profile of two adjacent wheels and PI (m= P/PI), in millimeter.
Modulus is one of the most basic parameters of modular gear. The
modulus of spur, helical and bevel gears can be referred to the
standard modulus series table (GB/T 1357-1987).
Mn = mtcos beta
M = p/PI
The circumference of the gear indexing circle is πd=z P
Module m is a basic parameter that determines the gear size. If the
modulus of a gear with the same number of teeth is large, its size
is also large.
Pressure Angle
Alpha rb = rcos alpha = 1/2 mzcos alpha
At the tangent point P of two gears' pitch circles, the acute Angle
between the common normal of the two tooth profile curves (i.e. the
force direction of tooth profile) and the common tangent of the two
pitch circles (i.e. the instantaneous motion direction at point P)
is called the pressure Angle, also known as the engagement Angle.
For a single gear, it is the tooth Angle. The pressure Angle of
standard gear is generally 20 ". In some cases, α=14.5°, 15°,
22.50° and 25° are also used.
Measure the diameter of a circle
d=m*z
Center distance
a=1/2*m(z1+z2)
Correct engagement condition
M1 = m2, alpha 1 = alpha 2, beta 1 = beta 2
To avoid root cutting, z1≥17 should be taken for the standard ruler
cylindrical gear with α=20o. Z2 = u · z1.
Top height coefficient and top clearance coefficient
- a and C * * h
When two gears engage, the top of one gear always enters the root
of the other gear. In order to prevent thermal expansion and
storage of lubricating oil space, the root is required to be higher
than the top of the tooth. The top height coefficient and top
clearance coefficient are introduced.
Normal tooth: H * A =1; C*=0.25 short tooth: h*a =0.8; C * = 0.3
Classification is introduced
Gears can be classified according to tooth shape, gear shape, tooth
line shape, tooth surface and manufacturing method.
Gear tooth profile includes tooth profile curve, pressure Angle,
tooth height and displacement. Involute gears are relatively easy
to manufacture, so in modern gears, involute gears account for the
absolute majority, while cycloid gears and arc gears are rarely
used.
In the aspect of pressure Angle, the bearing capacity of gear with
small pressure Angle is small. While high pressure Angle gear,
although the bearing capacity is higher, but in the case of the
same transmission torque bearing load increases, so it is only used
in special circumstances. The tooth height of the gear has been
standardized, and the standard tooth height is generally used. The
advantages of gear shift are more, has been throughout all kinds of
mechanical equipment.
In addition, gear can also be divided into cylindrical gear, bevel
gear, non-circular gear, rack, worm and worm gear according to its
shape; According to the shape of tooth line is divided into spur
gear, helical gear, herringbone gear, curve gear; According to the
tooth surface is divided into outer gear, inner gear; According to
the manufacturing method, it can be divided into casting gear,
cutting gear, rolling gear, sintering gear and so on.
Gear manufacturing materials and heat treatment process have great
influence on the bearing capacity, size and weight of gear. Before
the 1950s, gears used carbon steel, alloy steel was used in the
1960s, and surface hardened steel was used in the 1970s. According
to hardness, tooth surface can be divided into soft tooth surface
and hard tooth surface.
Soft tooth surface gear bearing capacity is low, but relatively
easy to manufacture, good running, more used for transmission size
and weight without strict restrictions, as well as small production
of general machinery. Because the load of small gear is heavier,
the hardness of small gear tooth surface is generally higher than
that of big gear in order to make the working life of big and small
gear roughly equal.
Hard surface gear bearing capacity is high, it is in the gear after
cutting, and then quenching, surface quenching or carburizing
quenching treatment, in order to improve hardness. But in the heat
treatment, the gear will inevitably produce deformation, so after
the heat treatment must be grinding, grinding or fine cutting, in
order to eliminate the error caused by deformation, improve the
precision of gear.
