Automatic multiple speed transmission based on stepped planetary gear train

FIELD: transport.

SUBSTANCE: automatic multiple speed transmission based on a stepped planetary gear train includes input and output shafts. The input shaft has a stepped planetary gear train and reverse planetary gear mounted thereon. The output shaft has driven gears and centrifugal governor mounted thereon. The stepped planetary gear train contains several sun gears fixedly connected to the input shaft and integrated into a train with several sets of pinions mounted on the common carrier block and rotating around the gears. The annulus gears of the stepped planetary gear train are installed so that they can freely rotate on the input shaft. There are two driving gears located on each end of the carrier block, out of which two are connected to the carrier block in a fixed manner and the other two are connected to the carrier block through forward friction clutches. The driving gears are engaged with respective forward driven gears on the output shaft. The outer collars of one-way clutches and the drive portion of the friction clutches have permanent magnets installed and lock slots provided thereon. The planetary gear casing and the driven portion of the friction clutches contain rotation speed sensors and locks; the outer collar of a one-way clutch is fixed by a lock that is controlled by the control unit based on speed sensor parameters transmitted to it.

EFFECT: higher efficiency and smaller size of a multiple speed transmission; reduced power losses as required to maintain pressure in the hydraulic system.

5 dwg

 

The device relates to mechanical transmissions and can be used in automobile and tractor industry.

Multi-stage gearbox changes gears based on the speed planetary unit 1 consists of the input and output shafts. On the input shaft mounted speed planetary gear unit 16 and the planetary gear reverse gear - 15. On the output shaft installed slave gears: 4 - a gear wheel of the first-fourth transfer; 5 - the fifth-eighth; 9 - ninth-twelfth, 11 gear thirteenth-sixteenth transmission, 14 - slave gear reverse gear, a rotary knob (not shown).

Gears 4, 5, 9 are connected with the output shaft through the one-way clutch 2, 3, 7, respectively. A gear wheel 11 mounted on the output shaft on the hub 10 freely, and is connected with the shaft through a friction clutch - 12, equipped with a mechanism of rigid fixation. Pressure plate of the friction clutch 12 has an extra feature of the brake drum and is covered by a brake band brake - 13.

Slave gear reverse gear mounted on the output shaft through the one-way clutch Assembly.

Speed planetary unit, figure 2, is mounted on the input shaft 1 and includes a planetary reduction gear consisting of a Central unit gears - 12, rigidly is connected to the input shaft, block took 11 sets of satellites 10, the annular gear wheel 4 mounted with the possibility of free rotation. On the outer surface of the ring gears installed one-way clutch - 8. The outer ring of the one-way clutches - 8 are slotted for mounted in the housing clamps - 7, and cover the brake line 6. The brake bands - 9 cover directly to the external surface of the annular gear wheel 4.

To determine when it is safe fixation of the outer ring one-way clutch is the speed sensor ring gear - 5.

The block led - 11 at both ends has two gears, which is leading to the first-fourth - 2; fifth-eighth - 3; ninth-twelfth 13th thirteenth to sixteenth - 14, transmission. Gears - 2 and a - 14 are connected with the block drove hard. Gears - 3 and a - 11 are associated with the unit drove through friction clutches 15 and 18, respectively, hydraulically activated and equipped with latches - 17.

Possible device locking mechanism of the outer ring one-way clutch stage planetary unit shown in figure 3.

The numbers mark:

1 - outer ring one-way clutch with slots for latch; 2 - ring with permanent magnets; 3 - spring return lock; 4 release; 5 - brake band; 6 - speed sensor rotation the outer ring one-way clutch; 7 - damper.

The possible workings of rigid fixing of the friction clutch shown in figure 4.

The numbers mark:

1 - shaft; 2 - leading part of the clutch with recessed latches; 3 - wheel discs; 4 - driven disks; 5 - pressure disc; 6 - latches; 7 - driven part of the clutch; 8 - return spring; 9 - sensor relative speed; 10 - permanent magnets.

Detailed device of the planetary gear reverse gear is shown in figure 5.

The numbers mark:

1 - ring gear; 2 - a leading gear; 3 - one-way clutch; 4 - brake band.

Presently known automatic transmission on the basis of planetary systems Simpson, RAVINIA. In addition to them similar in operating principle of the device described in patent RU 2104427 C1 and EN 2131956 C1. But these devices have the following disadvantages, which are free from patent protection device:

1. Large dimensions as main parts, friction clutches in particular, and aggregations. Used in the patented device the principle of rigid fixing of the friction clutches and external gear wheels of the planetary gear reduces the number, size, and wear of the friction surfaces used in the patented device, the layout allows you to use each of the four driven gears in four different to what Minasian changes and torque transfer.

2. The need to maintain high pressure in the hydraulic drive, which leads to significant power losses. The principle of rigid fixation allows after switching to reduce the pressure in the hydraulic system control.

3. A relatively small number of gears and the inability to create the basis of more simple (cheap) structures. The patented design of the device allows you to create a lineup of cheaper semi-automatic transmissions, when hydroporinae clutch gears replaced traditional mechanical spline, and a planetary speed unit acts as an automatic demultiplier.

The principle of multi-stage automatic gearbox changes gear based on speed planetary unit.

The principle of the stepped planetary unit.

Shown in figure 2 speed planetary unit, in this case, has four stages: three step-down, and one straight.

Torque from the input shaft through the block solar gear wheel 12 is transmitted to the satellites 10, satellites rotate with the block carrier 11 and rotate the ring gear 4 mounted with one-way clutches 8. This position is neutral, because torque will not come.

Podnimaemsya in the hydraulic system, control gear and using the brake bands 6 stop the outer ring one-way clutch 8, and with the release of the 7 block rigidly relative to the body, then reduce the pressure in the hydraulic system. One-way clutch 8 is blocked and stops the ring gear of the first stage of the stepped planetary unit. The satellites of the first stage begin to rotate on the axes of the block was taken and since the ring gear is stopped, the satellites start moving inside of him, pulling the block carrier 11. The rest of the ring wheel remains free and rotate with the block and drove satellites following steps.

To move to a higher level in the above way stop following the annular gear wheel. Because it works in tandem with more than the previous one, the sun gear, the power led will spin faster, pulling satellites and the ring gear of the previous and subsequent stages. The outer ring one-way clutch of the previous stage will remain locked, and the one-way clutch is unlocked. The transition to the lower level is in the reverse order. The engine braking mode is carried out using the brake bands 9, stopping directly to the annular gear wheel 4 running at this point level.

Rigid fixation of the outer ring one-way clutch is made using the latch is 4 (figure 3). This happens as follows:

Rotating relative to the housing, the permanent magnet 2 mounted on the outer ring of the one-way clutch are in close proximity speed sensor 6, causing him to electromagnetic impulse is transmitted to the control unit. In the strength and frequency of the pulse it is possible to judge the speed of rotation of the ring relative to the housing. And when the speed will decrease to safe small, the control unit will give the command to release the pin and rigid fixation of the outer ring one-way clutch 8. In this case, the control algorithm retainer can be of three types:

passive, when the system waits until the speed of rotation of the outer ring one-way clutch will fall under the action of friction forces itself;

active when the system acts on the engine to reduce torque for immediate reduction of the speed of rotation of the outer ring one-way clutch;

conditionally active when the system is preset time waiting, when the speed of rotation of the outer ring one-way clutch will fall under the action of friction forces itself, and if not, then the effect on the engine to reduce the torque.

Direct step is included as follows:

Block carrier 11 with the friction clutch 19 with tabs 17, is connected with the input shaft. The speed of rotation of the lock carrier and the input shaft is aligned.

The procedure and the algorithm of operation of the friction clutch with the same procedure and algorithm belt brakes planetary speed unit: raising the pressure in the hydraulic system controls include a friction clutch. By relative movement of the permanent magnets 10 (figure 4)defined by the non-driving part of the clutch 2 of the shaft 1 relative to the sensor 9 to the driven part of the clutch 7 is determined by the time when the relative speed of rotation of the driving part and driven relatively becomes safe for rigid fixation, the sleeve is fixed by means of clamps 6, after which the pressure in the hydraulic system control is reduced to the minimum at which it is engine braking.

Torque from the unit carrier of the planetary speed unit through one of the pairs of gears 2 (2) - 4 (figure 1); 3 (2) - 5 (1); 13 (2) - 9 (1); 14 (2) - 14 (figure 1), one-way clutch 1, 3, 7, friction clutch 12 is transmitted to the driven shaft. Each of these gear pairs changes the torque that corresponds to your ratio.

Thus, the torque coming from the stage planetary unit can have four different values, and the driven shaft it can be transmitted through four different ratio, the gear pair.

Reverse gear (5) is as follows. When Tumanny brake tapes planetary speed unit with the brake bands 4 stop carrier of the planetary gear reverse gear. Torque is rigidly mounted on the input shaft sun gear through satellites is transmitted to the ring gear, changing its direction. Further through the one-way clutch 3 is transmitted to the wheel 1 with a ring gear 2 and further - to the slave gear wheel on the output shaft.

Multi-stage automatic gearbox changes gear based on speed planetary unit has an input shaft, which has a planetary gear, ring gear which has one-way clutches, brake bands, leading gears, friction clutches enable run forward gear, planetary gear reverse gear; an output shaft, which through the one-way clutch mounted driven gear gear run forward and a follower gear of the reverse gear, a friction clutch activate the engine brake and hydraulic control system, characterized in that the planetary gear is made in the form of stepped planetary unit and has a few Sunny gear wheels rigidly connected with the input shaft and the joint block, which rotate several sets of satellites that are installed on a common block carrier, the ring gear is installed with the possibility of free rotation on the input the Alu, leading gears are located at both ends of the block took two, two of whom were associated with the block drove hard, and the two are connected with the unit drove through a friction clutch inclusion programs move forward, hydraulically activated and equipped with clamps, and are in engagement with the respective driven gears gears move forward output shaft, one of which is installed on the output shaft on the hub freely, and is connected with the shaft through a friction clutch, the outer rings of the one-way clutches mounted on the annular gear wheels, and the leading part of the friction clutches mounted permanent magnets and made slits for release and in the case of the planetary gear unit and driven parts of the friction clutch set the speed sensors and the latches and rigid fixing of the outer ring one-way clutch is made using the latch, controlled by the control unit according to the parameters of the speed sensor is transmitted to the control unit.



 

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10 cl, 4 dwg

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2 dwg

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EFFECT: reduced wear of disks, increased transmitted power and improved repairability of clutch.

2 dwg

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