Procedure for continuously variable translation of motion and facility for implementation of this procedure

FIELD: machine building.

SUBSTANCE: facility for continuously variable translation of motion consists of case, of driving shaft with drive pinion, of carrier, of converting mechanism, of driven shaft and of mechanism adjusting gear ratio. The drive pinion engages intermediary gears arranged along circumference. The intermediary gears transfer rotation via converting mechanisms and differentials installed between them to a tooth gear of internal engagement connected with the case and the driven shaft. Also uniform rotating motion of the driving shaft is converted into two separate, but equal by module continuous motions containing sections with accelerated and retarded motions. Further continuous motions are combined. Notably, uniform rotating motion transmitted to the driven shaft is resultant. Gear ratio between the driving and driven shafts is adjusted by phase shift of two separate continuous motions.

EFFECT: simplification of mechanism control and increased service life of transmission.

4 cl, 16 dwg

 

The invention relates to the field of engineering. In particular, the stepless transmission of motion, which provides smooth and continuous change of the force and kinematic ratio.

It is known that transmission that provides smooth, stepless change of the angular velocity of the driven shaft at a constant angular velocity of the host, referred to as variable-speed drives (Two "machine Parts", "Higher school", Moscow, 1973, p.45). The variators are classified into several major types: frontal cone, ball, ring, shoes, tore etc. In all these progressive movement from one shaft to another is transmitted by friction induced between the working surfaces of the rotating rollers, such transmissions are called friction. For example, in the front variator master and slave rollers touch each other. When you change the touch point of the slave rink relative to the center of rotation of the leading rink, increases (decreases) the circumference of a circle described by the point of rotating the driven roller. When this changes, the angular velocity of the driven shaft. Friction variable-speed drives have several advantages: simplicity of construction and cheapness of manufacture, smooth and noiseless operation, the possibility of stepless speed regulation; g-rollers p is occulsive, preventing the drive mechanism from damage. At the same time all the above types of friction variator inherent disadvantages: volatility ratios due to slippage rollers, the limited transmit power (10-20 kW), large loads on their shafts and bearings (bearings), relatively low efficiency, the wear of the working surfaces of the rollers and heating. Therefore, in the mechanical power transmission based on the friction variable-speed drives, are rarely used.

In addition to the friction gear in mechanical engineering apply belt and chain variators. The main structural elements of the chain variator are two pairs of sliding gear cones and an endless chain with sliding plates. Such a variable transmit power up to 75 kW, when the peripheral speed of 6-9 m/s the efficiency of the variator depending on the gear ratio changes in the range of 0.85-0.95. The greatest range of variation of the gear ratio is equal to 7. The disadvantage of the variator is the low reliability of belt and chain, which limits the transmitted power.

The closest technical solution of the present invention are pulsed continuously variable transmission that can be selected as a prototype. In particular, the known pulse automatic transmission (Vfemale "Mechanical impulse transmission, Mos is VA, Mechanical engineering, 1978, p.71). The transmission includes a drive shaft with a leading gear wheel, around which revolve the intermediate gears that are located in engagement. When the rotation of the intermediate gear report impulses cage, leading him into an oscillatory motion. Further movement in a certain way is transmitted through the mechanism of a free motion (USDA) slave shaft. The mechanism that converts the rotary motion of the drive shaft of the transmission in the oscillatory motion of the link rigidly connected to the driving member of the Ministry of agriculture, called transformative mechanism.

According to this principle works not only this transmission, but all pulsed continuously variable transmission. In pulsed continuously variable transmission unlike other types of transmission energy is not continuously, but in the form of periodic pulses. Typically, the rotary motion of the drive shaft in these programs is converted into an oscillatory motion, which with the help of USDA again transformed into rotational motion, but the driven shaft. Mechanism built according to this principle, you can send very large energy, but at the same time is a significant drawback: the rotation of the driven shaft is intermittent, which limits their use only in special mechanisms. For example, are used in drives podocyturia machines, presses, conveyors, feeders, etc. this mechanism cannot be used in the transmission of the vehicle as a variator for varying the speed of movement.

From the literature it is also known (Niegocin, Mggiste "Handbook of elementary physics", publishing house "Nauka", Moscow, 1966), that the movement for equal periods of time, the speed changes by the same amount, called ravnomernym. The value measured by the change in velocity per unit time is called acceleration. Acceleration can be positive (accelerated motion) and negative (slow motion). Uniform is called the movement, at which point in any equal intervals of time passes equal distances.

The technical problem solved by the invention is the development of a continuously variable gear transmission (CVT), which could be applied in the transmission of the vehicle or other mechanism for smooth and continuous change in force and kinematic ratios. This simplifies the control mechanism (e.g., car), allows you to get close to the ideal traction-speed characteristic, to increase the service life of the transmission by reducing dynamic loads, to improve the patency of the car.

The technical problem is solved by the fact that in transformative mechanism of the uniform rotary motion of the drive shaft is converted into two separate, but equal modulo continuous motion, containing areas with fast and slow movements, then continuous movement formed. When this resultant will be uniform rotational motion transmitted to driven shaft. Gear ratio between the master and the slave shaft is governed by the phase shift of two separate continuous movements.

Explain the principle of superposition for example. Suppose we have two rotating element connected in a certain way. One element rotates fast, the other slow. The resultant of the addition of the two accelerations is a constant (see table 1).

Table 1
Accelerated motion12345678
Slow motion87654321
99999999

Now move fast and slow motion are out of phase relative to each other. When this resultant will also uniform motion (constant value), but different in magnitude (see table 2).

Table 2
Accelerated motion12345678
Slow motion15141312111098
The resulting movement16161616 16161616

Device for the stepless change of transmission ("CVT") is shown in the drawings.

Figure 1 and 2 shows a view of the variator exploded detail, explaining its structure and relative positions of the main Assembly units and composite parts.

Figure 3 and 4 shows a drawing of the variator assembled (front and back).

Figure 5 and 6 shows the design of the drive element (front and back).

7 and 8 shows the structure of a driving element (front and back).

Figure 9 shows the Assembly drawing of the master and slave elements.

Figure 10 and 11 shows the Assembly drawing conversion mechanism (front and back).

On Fig the design of the differential.

On Fig shows a drawing of the mechanism of change of gear ratio.

On Fig a diagram explaining the movement took on corrective groove.

On Fig and 16 shows graphs of the result of continuous motion from changes in the phase of rotation of the eccentric pairs.

The variator consists of a housing 1 with the driven shaft 2 and the gear of the internal gear 3. Clip 4 and 5 represent a body of rotation with holes 6, in which the bearings are installed torque is to be around their axes leading 7 and led 8 elements. Every two clamps 4 and 5 are rigidly interconnected and are transforming mechanism. The holes 6 in the interconnected clips are eccentric relative to each other, because therein the driving and the driven elements connected movably in a certain way, also posted eccentric and are eccentric pair. In transforming the eccentric mechanism couples may be 3 or more. The proposed construction of four of them.

The leading element, the surface of which is made diametrical groove 9, provided with the intermediate gear 10 and placed in the bearing. On the surface of the slave element is made of a curved adjustment slot 11 and the radial groove 12. A driven element provided with a bevel gear 13 and is also placed in the bearing 14.

Master and slave element (eccentric pair) are connected as follows (see Figure 9): in the diametrical groove 9 of a driving element slidably mounted to the slider 16 with a hole and corrective planet carrier 17, and the radial groove 12 of the slave element adjustably mounted basic carrier 15. The main carrier 15 is a hole (position not defined) of the slide 16. Drove 17 of the RAM included in the adjustment groove 11 of the slave element and slides along it. Because the axis of rotation of the master and the slave element are eccentric, that is the main carrier 15 during rotation of the driven element around its axis is coming and moves away from the axis of a uniformly rotating a driving element, causes fast and slow movements of the slave element and, accordingly, the bevel gear 13. The main carrier associated with the slider 16 moves along its diametrical groove 9. Each eccentric couple in transforming mechanism is separated relative to each other at an angle of 360°/n, where n is the number of eccentric pairs).

As a result of such complex movements of the driven element makes the alternating movement of the bearing sinusoidal in nature. And we, in accordance with the above described principle of superposition of movements necessary to a driven element did not sinusoidal, and uniformly accelerated and ravnoznachen movement. In order to cause movement of the driven element to the desired and intended corrective groove 11. Corrective groove plays a role as the "rectifier" ascending and descending branches of the sinusoidal oscillation, as can be seen from the graphs on Fig and 16. A method of constructing a curve adjustment groove not shown. The shape of the curve is calculated individually for each variable, based on embodied technical characteristics, but also depends on the design dimensions of the parts included in separate units.

The differential 18 is designed for removal superimposed on each other fast and slow motion driven eccentric elements couples the conversions the existing mechanisms and the transfer of these movements through the gear of the internal gear 3 slave shaft 2. Differentials (4 pieces) are placed between transformative mechanisms and are with them in mechanical engagement. Differential (Fig) includes a segment gear 19, within which is mounted a separator 20 with satellites (bevel gears) 21. The satellites are in engagement with the bevel gear 13 driven elements of both transformative mechanisms. Axle separators with two sides are in depressions made on the ends of the bevel gears 13, giving the possibility to rotate the differential around its axis. Simultaneously with the gear of the internal gear 3 is in contact only one segment gear 19. That is, the gear 3 rotates the segment gears alternately, providing continuous rotation of the output shaft 2.

The mechanism of change of gear ratio is designed to regulate the speed of rotation of the output shaft at a constant speed of rotation of the input shaft. The mechanism of change of gear ratio includes a hollow sleeve 22 in which one end is made screw-thread 23, and the other end is made straight slots 24. In the sleeve with one end inserted shaft 25 with straight slots. From the other end inserted into the sleeve shaft 26 with the screw cutting, simultaneously performing the role of the driving shaft of the variator. Between the helical cuts to reduce friction inserted the ariki. The sleeve is inserted into the housing 27 with the pinion 28 of the first conversion mechanism meshing with the intermediate gear 10 of the leading elements of the first conversion mechanism. From the other end of the shaft 25 is equipped with the gear 29 of the second conversion mechanism, also meshing with the intermediate gear 10 of the leading elements of the second transforming element.

Its final drive ratio is changed by the extension (moves) sleeve 22 along the drive shaft 26. The reciprocating movement of the sleeve can be carried out, for example, the creation of a cavity And the housing 27 of the hydraulic pressure, the clamping sleeve. In this case, the sleeve 22 plays the role of the piston. When this scroll shafts 25 and 26, through which the associated wheel gear 28 and 29 rotate gear 10 transformative mechanisms, thereby providing a phase shift of rapid and slow motions. Accordingly, the changing speed of the output shaft 2.

The range of change of gear ratio D of the variator is determined by the displacement angle α eccentric pairs and depends on the number of eccentric pairs in a transformative mechanism. On Fig and 16 shows that the upper and lower limit gear ratio depends on the angle of shift of one eccentric relative to another pair. Changing the size of the area of the uniform is viginia.

The variator works as follows:

During the rotation of the drive shaft 26, the rotary motion through the gear 28 and a is transmitted to the intermediate gear 10 leading elements 7, which in turn rotated the driven elements 8. This led elements right away rotate rapidly and right away slow. Bevel gear 13 driven elements of both transformative mechanisms rotate the satellites 21 and the segmental gear 19. At the segmental gear overlaying continuous movements obtained at the output of the two conversion mechanisms. The resulting continuous folding motion is uniform motion. Eat the resulting motion with a segmental gear is through the gear of the internal gear 3 and is transmitted to the driven shaft 2.

1. The way stepless change of transmission, in which a uniform rotational movement of the drive shaft is transmitted to the driven shaft through a transforming mechanism, characterized in that transformative mechanism of the uniform rotary motion of the drive shaft is converted into two separate but equal modulo continuous motion, containing areas with fast and slow movements, then continuous movement formed, thus resulting will be uniform rotational movement is s, passed on the driven shaft, and the gear ratio between the master and the slave shaft is governed by the phase shift of two separate continuous movements.

2. Device for the stepless change transmission comprising a housing, a drive shaft with a pinion which engages with placed around the circumference of the intermediate gears, carrier, transforming mechanism, a driven shaft, mechanism for regulating the transmission ratio, characterized in that the intermediate gear transmits rotation through transformative mechanisms and placed between the differential gear wheel internal gear associated with the housing and driven shaft.

3. Device for the stepless change transmission according to claim 2, characterized in that the transforming mechanism consists of two rigidly interconnected cages, in which the circumference of the holes, which are rotating around their axes eccentric pair consisting of leading and trailing elements, and on the surface of each secondary element is made of a curved adjustment slot and a radial groove, along which moves a set in the main carrier, and provided with a bevel gear, and on the surface of each host item made diametrical groove in which movably installed on the Zun with corrective planet carrier, when this adjustment has led slider leading element is included in a curved adjustment slot of the slave element, and the main led drive element enters the opening in the slider of the leading element and the axis of rotation of the slave and the master elements are displaced relative to each other, forming eccentricity.

4. Device for the stepless change transmission according to claim 2, characterized in that the mechanism regulating the ratio consists of two shafts, the ends of which is screw cut and straight slots included in the cavity of the hollow sleeve, which on one hand made screw thread, and on the other hand made the straight slots, and adjusting the gear ratio between the master and slave shafts is effected by rotation of the eccentric pairs of one conversion mechanism relative to the eccentric pairs other conversion mechanism, and the rotation of the eccentric pairs is carried out by moving the hollow sleeve along the shaft with the screw cutting.



 

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FIELD: machine building.

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Gearbox // 2313709

FIELD: transport engineering; vehicle transmissions.

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FIELD: mechanical engineering.

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39 cl, 15 dwg

Drive (versions) // 2278309

FIELD: mechanical engineering; devices for control of rotational speed of working member shaft.

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5 cl, 3 dwg

FIELD: mechanical engineering.

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2 dwg

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