Planet Carrier Output Shaft PM Sintered Part
The invention of the planetary automatic transmission has made the operation of the car more convenient and labor-saving, and the comfort has also been greatly improved. The locked central differential and the variable power distribution of the front and rear axles increase the passability of the car, and the greatest credit comes from the mysterious planetary gear mechanism.
Product Introduction
|
Planet carrier output shaft PM sintered part |
||||||
|
Item |
Material |
Production Process |
Sintering Temperature |
Mold |
Custom |
|
|
Planet carrier output shaft |
40cr ni |
Powder metallurgy |
1280℃ |
To be customized |
Yes |
|
|
Chemical composition |
quality score（%）： Cr：0.45～0.75 Ni：1.00～1.40
|
|||||
|
Available Materials |
Low carbon stainless steel, titanium alloy (Ti, TC4), copper alloy, tungsten alloy, hard alloy, high temperature alloy (718, 713) |
|||||
Product advantages
|
Smoothness |
Dimensional accuracy |
Product density |
Appearance treatment |
Appropriate weight |
|
Roughness 1～5μm |
（±0.1%～±0.5%） |
92～95% |
Mirror reflection |
0.03g～400g） |
|
Mechanical properties |
Tensile strength (σb/MPa): ≥980 Yield point (σs/MPa): ≥785 Elongation after break (δ5/%): ≥10 Reduction of area (ψ/%): ≥45 Impact absorption energy (Aku2/J): ≥55 Brinell hardness (HBS100/3000) (annealed or high temperature tempered state): ≤241 |
|||
|
Heat treatment |
40CrNi belongs to hypoeutectoid steel, which is completely austenitized after heating at 860°C. When it is cooled by normalizing, proeutectoid ferrite is precipitated, and then austenite transforms into pearlite-like structure (lamellar). Due to the fast cooling rate and the small spacing of pearlite sheets, it is easy to obtain sorbite or troostite structures (both of which belong to pearlite in a broad sense). Therefore, the structure is ferrite + pearlite |
|||
Planet carrier output shaft PM sintered part working principle
The invention of the planetary automatic transmission has made the operation of the car more convenient and labor-saving, and the comfort has also been greatly improved. The locked central differential and the variable power distribution of the front and rear axles increase the passability of the car, and the greatest credit comes from the mysterious planetary gear mechanism.For most friends who love cars, this little thing is both magical and complicated, and it is difficult to understand it thoroughly. Today, Zhongwei Precision will give you a brief introduction to the basic principles of automotive machinery technology enthusiasts. Please correct me for any deficiencies.
The planetary gear mechanism is the most important mechanical transmission part in the transmission. In the Torsen differential, it is the most important locking and front and rear axle torque distribution mechanism. To master the working principle, you must first master the power transmission method of the single-row planetary gear mechanism.
▌Basic structure and working principle:
The basic structure of a single-row planetary gear mechanism is shown in the figure:
The basic structure of the single-row planetary gear mechanism is compared with the physical picture as shown in the figure:
The structure of the single planetary gear is composed of a sun gear, a ring gear, a planet carrier and planetary gears supported on the planet carrier.
The sun gear is located in the center of the whole mechanism just like the sun, the planet gears mesh with the sun gear, and the internal tooth design of the ring gear allows the ring gear to mesh with the planet gears on the planet carrier. Usually there are 3-6 planetary gears (there are four planetary gears in the above figure) symmetrically and evenly installed on the needle bearings of the planetary carrier through needle bearings. When the planetary gear mechanism is working, in addition to the rotation around its own axis, the planetary gear can also revolve around the sun gear at the same time, and the planet carrier also rotates around the sun gear. Since the sun gear and the planetary gear are externally meshed, the rotation directions of the two are opposite. of. The planetary gear and the ring gear are internally meshed. The direction of rotation is the same for both. The sun gear, the ring gear, the planet carrier and the planet gear are usually referred to as the four basic elements.
According to the basic principle of gear transmission: the large gear drives the small gear to increase speed, and the small gear drives the large gear to reduce speed. The rotation of the internal mesh is the same, and the rotation of the external mesh is opposite. Every time a gear is added, the direction changes once, according to this basic principle.
before analysis. Assume that the active element rotates clockwise.
(1) The planetary carrier is active, the ring gear is driven, and the sun gear is fixed to form a state of increasing speed in the same direction. The planetary carrier with the largest number of teeth drives the ring gear with a smaller number of teeth to rotate, and the speed increases. Because it is internal meshing, it forms the same direction. In the speed-up state, that is to say, the planetary carrier rotates clockwise, and the ring gear must also rotate clockwise, and the speed increases.
(2) The planet carrier is active, the sun gear is driven, and the ring gear is fixed to form a state of increasing speed in the same direction. The planet carrier with the largest number of teeth drives the sun gear with the smallest number of teeth to rotate, and the speed increases the most. Because it is internally meshed, it forms the same direction. state of acceleration.
(3) The sun gear is active, the planet carrier is driven, and the ring gear is fixed to form a deceleration state in the same direction. The sun gear with the least number of teeth drives the planet carrier with the largest number of teeth to rotate, and the speed decreases the most. Because it is internal meshing, it forms a deceleration in the same direction. state.
(4) The sun gear is active, the ring gear is driven, and the planetary carrier is fixed to form a reverse deceleration state. The sun gear with the least number of teeth drives the ring gear with more teeth to rotate, and the speed decreases. Because of the fixed planetary carrier, the planetary gear is the idler gear , so a reverse deceleration state is formed.
▌The role of the planetary gear mechanism in the AT gearbox:
AT gearbox is one of the most reliable and smoothest transmission gearboxes, even the speed king in our mind (Nissan GTR) also uses AT gearbox. The planetary gear mechanism is behind all the glory. The electronic control system plus the AT gearbox (planetary gear mechanism) realizes faster upshifts and downshifts.
Gear D1 The sun gear is active, the planetary carrier is passive, and the ring gear does not move.
In gear D2, the sun gear does not move, the planet carrier is passive, and the ring gear is active.
In gear D3 (overdrive), the sun gear does not move, the planetary carrier is active, and the ring gear is passive.
In R gear, the sun gear is active in reverse gear, the planetary carrier does not move, and the ring gear is passive.
N gear When all moving parts are free, the transmission is in neutral.
▌The role of the planetary gear mechanism in the middle of the differential:
Kandi mentioned in the introduction of the Audi Torsen differential in the last issue that when the Torsen differential evolved from the A-type to the C-type at the beginning, the form of the three-spoke worm gear has been replaced by a planetary gear mechanism. , so as to solve the shortcoming that it can only be matched with an automatic transmission, and realize that it can be matched with any gearbox, which greatly increases the practicality and reliability of the Torsen differential. According to the needs of driving conditions, it can output up to 60% of the driving force to the front axle, or 80% of the driving force to the rear axle.
The principle of the C-type Torsen differential is to use a planetary gear structure, which together with the sun gear, ring gear and friction disc form the entire differential structure. When the speeds of the ring gear and the sun gear are not equal, the planetary gears are forced to produce an autorotation, which in turn causes axial relative motion with the ring gear or the sun gear. The pressure of the axial movement exerts pressure on the friction discs installed in the device, creating internal friction, thus restricting the relative movement, which restricts the movement of the slipping drive shaft, thereby increasing the torque of the non-slipping drive shaft.
▌The middle is the precise summary:
The application of the planetary gear mechanism in the car is mainly in the automatic transmission and the differential. The very simple structure realizes the complex transmission and locking functions, making the control of the car easier. Some people say that there are only two types of differentials in cars, one is the Audi quattro four-wheel drive system (Torsen differential), and the other is other differentials. The extremely high praise for the Torsen differential comes from the introduction of the planetary gear mechanism into the Torsen differential. In fact, through Kandy’s explanation, you can see that the principle of the planetary gear mechanism is not complicated, just like Akimi The lever principle that De wants to move the earth is just a fulcrum and a rod, and the planetary gear structure is only a purely mechanical structure, and there are only a few gears in the middle. The ingenious design of the engineers endows it with very powerful functions, which play a vital role in the entire transmission process.
Metal Injection Molding Process
Detection Systems
Send Inquiry
