Stepless transmission

FIELD: mechanical engineering, namely, stepless mechanical transmissions, possible use in drives of various mechanisms and machines for stepless adjustment of speed of rotation of working organs from zero to given value.

SUBSTANCE: driving element of stepless transmission is made in form of resilient coil, capable of changing step by means of control mechanism. Resilient coil is represented by a split collar 6, positioned between barrel of driving shaft and external cylindrical bushing of control mechanism. Stepless transmission also contains adder of movements, made in form of toothed transmission, driven link of which is held on driven shaft 16, and driving links are kinematically connected through sleeves and driven element, made in form of at least two spring-loaded pushers 19,20, with split collar 6.

EFFECT: expanded functional capabilities of stepless transmission, ensures smooth change of speed and possible setting of zero speed, and also ensured continuous movement of driven element.

4 cl, 15 dwg

 

The invention relates to the field of engineering, namely to a continuously variable mechanical transmission, and can be used in drives of various machines and mechanisms for stepless regulation of speed of rotation of the working bodies from zero to a predetermined value.

Known continuously variable transmission containing a drive shaft associated with the leading element made in the form of a rotating helical spring, one end of which is stationary in the axial direction, and the second end of the spring is connected with a control mechanism that allows you to stretch or compress the spring, thereby to change the turn-to-turn distance, i.e. the step of spring. As the slave element is a rod placed between the coils of the spring perpendicular to its axis. During the rotation of the spring clutch element is moved along the axis of the spring at the rate specified step spring [1].

A disadvantage of the known continuously variable transmission is limited in its application due to the inability to provide the slave element zero speed and continuity of its movement.

The present invention is the increased functionality of the continuously variable transmission by providing not only a smooth speed changes, but also the possibility of installing a zero speed and continuity of movement of the slave ale the NTA.

This task is solved in that a continuously variable transmission that contains a drive shaft associated with the leading element made in the form of an elastic loop with the ability to change it step by means of the control mechanism includes a helical gear, the shaft of which is connected through an adjusting nut and a bearing with an adjusting element and a driven element, which interacts with an elastic coil, includes the additional adder movements made in the form of a gear transmission, the slave element which is fixed on the driven shaft, and leading the links kinematically connected through a clutch and a driven element with an elastic coil, a drive shaft provided with a cylindrical glass, inside of which is placed the adjusting element of the control mechanism made in the form of inner and outer cylindrical sleeves coaxially mounted on the control shaft with the possibility of relative rotation and axial movement, while the elastic coil is made in the form of a split ring, is placed between the cylindrical Cup drive shaft and an outer cylindrical sleeve of the control mechanism and pivotally connected with the said sleeve, and a driven element is designed as at least two spring-loaded to the split ring pushers, kinematically connected to the adder movements with the output shaft.

Each of the t is lately fitted with a toothed rack, interacting with the corresponding driving member adder movements, and pivotally connected by means of a spherical head with anti-friction thrust bearing in contact with the split ring.

Clutch adder movements made in the form of overrunning placed inside the leading elements of the gearing or coupling couplings, installed on the leading links of gear and kinematically associated with the management of the profile curve performed on a cylindrical Cup drive shaft.

1 shows a continuously variable transmission, the General view in section, in the closed position of the ends of the split ring (zero-step loop). Figure 2 - the same, in the fully extended position of the ends of the split ring (maximum step loop). Figure 3 - the same, the section a-a in figure 1. Figure 4 shows the kinematic diagram of a continuously variable transmission (version adder movements with overrunning clutches). Figure 5 shows the drive mechanism coupling the coupling adder movements, cross-section b-B in figure 3. Figure 6 shows a General view of the outer cylindrical sleeve. Figure 7 is the same, the section b-b In Fig.6. On Fig shows a General view of the guide of the adjusting nuts. Figure 9 is the same, the section G-G Fig. Figure 10 shows a fragment of the scan profile curve of a cylindrical Cup drive shaft. Figure 11 shows a General view of the RA is carved rings. On Fig the same, top view. On Fig is the same, the section d-D on Fig. On Fig is the same, the section e-E on Fig. On Fig shows a circuit with coupling sleeves adder movements.

Continuously variable transmission (1, 2) includes a housing 1, in which the bearing is mounted stationary in the axial direction of the drive shaft 2, provided with a cylindrical glass 3. On the outer surface of the Cup 3 is made, for example, the annular flange 4, having the shape of the profile curve on the arc of a circle, the smaller 180° (figure 10). In the Cup 3 perpendicular to its axis still has the finger 5 (installed during Assembly of the device), which is fixed to the split ring 6 made in the form, for example, hollow ring of rectangular profile (Fig, 14). On the outer cylindrical surface of the ring 6 is perpendicular to its axis is made the opening 7 in which is placed the finger 5 of the Cup 3. On the inner cylindrical surface of the ring 6 are diametrically located holes 8, 9, the axis of which is perpendicular to the axis of the hole 7. At one end of the split ring 6 is made angular slice (4, 11), providing the movement of the ends of the ring 6 at the opposite side without touching each other. Inside the Cup 3 is coaxially mounted inner 10 and 11 outer cylindrical sleeve with the possibility of relative rotation and oevag the move. Sleeve 10 and 11 respectively provided with fingers 12, 13, permanently installed perpendicular to their axes and inserted with a clearance into the corresponding holes 8, 9 split ring 6. The ring 6 is placed between the bushing 11 and the Cup 3. On the outer sleeve 11 is made of a rectangular opening 14 for the passage of the finger 12 of the sleeve 10 and relative rotation and axial movement of the sleeves 10, 11 when the opening ends of the split ring 6.

Continuously variable transmission includes an adder movements (Fig.1-3), made in the form of a gear transmission, the slave gear wheel 15 which is fixed on the driven shaft 16 and kinematically connected with the leading toothed wheels 17, 18, arranged diametrically relative to the axis of the shaft 2.

As the drive element continuously variable transmission are the pushers 19, 20 (1, 2)located diametrically relative to the axis of the drive shaft 2 and disposed between the glass 3 and the sleeve 11 with the possibility of reciprocating movement in guides 21, 22 of the housing 1. The pushers 19, 20 are equipped with racks 23, 24, which is in constant mesh respectively with the gear wheels 17, 18. The upper ends of the plungers 19, 20 are bent at an angle of 90° to their axis and connected respectively with springs 25, 26, fixed to the body 1. The lower ends of the plungers 19, 20 pivotally connected by means, for example, spherical nd the set of 27, 28 with anti-friction thrust bearings 29, 30 mounted slidable on the surface of the split ring 6.

The control mechanism continuously variable transmission includes a screw gear shaft 31 which is mounted a coaxial drive shaft 2 with reversible rotation and provided with separate sections on the left and right-hand thread, which are, respectively, the adjusting nut 32, 33 can be moved in guides 34, 35 of the housing 1 along the axis of the shaft 31. Nuts 32, 33 coupled respectively through bearings 36, 37 with cylindrical bushings 10, 11.

In the embodiment, adder movements with coupling couplings leading gears 17, 18 fixedly mounted respectively on the shafts 38, 39 mounted for rotation on the bearings of the housing 1 (Fig 3). On the shafts 38, 39 with the possibility of free rotation and immobile in the axial direction is set accordingly toothed gear 40, 41, performed at the same time with them tapered coupling coupling halves 42, 43, cone coupling half-coupling 44, 45 mounted on the keyed connection with the possibility of axial movement, Belleville springs 46, 47, freely placed between the gears 40, 41 and the coupling 44, 45, cone washers 48, 49, installed with the possibility of free rotation and axial movement, cone washers 50, 51 mounted is with the possibility of free rotation and immobile in the axial direction. Gears 40, 41 are in constant mesh with the driven gear wheel 15.

Continuously variable transmission includes a mechanism to automatically control the operation of coupling sleeves with leashes 52 (figure 5, second leash not shown)placed between the inner surface of the housing 1 and the outer cylindrical surface of the Cup 3 of the shaft 2 and located diametrically opposite each other with the possibility of reciprocating movement along the slots 53 (second groove not shown)made on the inner side surface of the housing 1. Each of the leads 52 contains installed on their axes with the possibility of free rotation of the rollers 54, 55, placed on both sides of the flange 4 of a cylindrical Cup 3 with the ability to copy the profile curve of the flange 4 when the rotation shaft 2. Fork clutch 56, 57 pivotally connected by leads 52 and is made in the form of wedges with side cuts at an angle equal to the angle of the conical washers 48-51 (3, 5), which allows to provide a linear contact them with cone washers 48-51 in the moment of switching on the coupling sleeves.

Continuously variable transmission operates as follows.

During the rotation of the drive shaft 2 (Fig 1, 2) clockwise rotate together with the split ring 6, the inner 10 and 11 outer cylindrical sleeve. In position when the working surface of the split ring 6 RA is Medina in the plane perpendicular to the axis of the shaft 2 (the ends of the split ring 6 are closed), the pushers 19, 20 fixed and, accordingly, at this point in time, the speed of the driven shaft 15 is equal to zero

When the rotation shaft 31 (Fig 1, 2) nuts 32, 33 welling up on the threads of the shaft 31 with left and right thread and move along the guide grooves 34, 35 in opposite directions along the axis of the shaft 2. Nuts 32, 33 by means of bearings 36, 37 impinges on the cylindrical sleeve 10, 11 and move them in opposite directions along the axis of the shaft 2. Bushings 10, 11 with the fingers 12, 13 bred the ends of the split ring 6 at a specified distance from each other, thus forming one turn of the screw, the step which changes when the rotation shaft 31 from zero to a predetermined value. The angular cut of the split ring 6 (4, 11) when increasing the step loop from zero provides the movement of the ends of the ring 6 in opposite directions along the axis of the shaft 2 without touching them to each other. Rotation of the split ring 6 in such position forces the plungers 19, 20 to perform a reciprocating motion along the axis of the shaft 2 and the thrust bearings 29, 30 copying a profile of the working surface of the split ring 6. When moving, for example, the pusher 19 up (figure 2, 3) into the slots of the guide 21 is stretched spring 25 and the toothed rack 23 rotates counterclockwise are with her in mesh Veda is its gear wheel 17, which when the overrunning clutch or coupling the clutch stroke through the shaft 38 rotates in the same direction as the gear 41. Gear 41 causes the clockwise rotation being in engagement with her slave gear 15 and the driven shaft 16. At the end of a coil split ring 6 overrunning clutch or coupling clutch is turned off (idling), and the plunger 19 under the action of the spring 25 is lowered at the beginning of round split rings 6.

At the same time, the plunger 20 also moves upward in the guide slots 22, stretched the spring 26 and the toothed rack 24 rotates counterclockwise which it engages the drive sprocket 18, which when the overrunning clutch or coupling the clutch stroke through the shaft 39 rotates the gear 42 counterclockwise. Gear 42 causes the rotation clockwise in engagement with her slave gear 15 and the driven shaft 16. At the end of a coil split ring 6 overrunning clutch or coupling clutch is turned off (idling), and the pusher 20 under the action of the spring 26 is lowered at the beginning of round split rings 6. Upon further rotation of the drive shaft 2 and the process repeats.

Overrunning clutch or coupling couplings remain enabled for each of the pushers 19, 20 turns on the arc length of the circumference of the flange 4 of a cylindrical Cup 3 of the shaft 2 over 180� that allows you to override the working movements of the pushers 19, 20 and thereby ensure continuity of rotation of the driven shaft 16 (Fig). Thus, each revolution of the drive shaft 2, the total size of the working strokes of the plungers 19, 20 is equal to the full step coil fixed shaft 31 at this time.

The mechanism of automatic control coupling clutch continuously variable transmission operates as follows.

When the rotation shaft 2, the rollers 54, 55 of the lead 52 is moved along the flange 4 of a cylindrical Cup 3 of the shaft 2 by copying the profile curve (Fig 3, 5, 10). This leash 52 moves along the groove 53 of the housing 1 down and together with a fork clutch 56. Cone washers 48, 50 reteplase, and the cone half-coupling 44 under the action of the Belleville springs 46 is moved to the key on the shaft 38 and is removed from the coupling with the coupling half 42 of the gear 41. The transmission of torque to the gear 41 and then to the driven shaft 16 is stopped, the clutch is turned off. This action takes place before the end of the round split rings 6 and depends on the arc length of the profile curve of the flange 4 of a cylindrical Cup 3 of the shaft 2, which in this area must be less than 90°. Upon further rotation of the shaft 2, the rollers 54, 55 leash 52 continue to copy the profile curve of the flange 4, and the lead 52 is moved along the groove 53 up. The plug 56 of the clutch at the same time, C is goes into the gap between the washers 48, 50 and through the cone washers 48 moves the cone half-coupling 44 to the coupling half 42 of the gear 41, compressing the Belleville spring 46. Coupling 44 and 42 are inserted in the coupling between them, and the gear 41 transmits torque to the driven shaft 16 through a gear wheel 15. The clutch is enabled. This action takes place at the beginning of the round split rings 6 and also depends on the arc length of the profile curve of the flange 4 of a cylindrical Cup 3 of the shaft 2, which in this area must be less than 90°. The same thing happens when you turn on/off the coupling of the coupling on the shaft 39 of a leading gear wheel 18. The bearings are arranged on the shafts 38, 39, provide coupling clutch is in the on state with minimal friction losses. Enabling and disabling coupling couplings synchronized with the working and idle strokes of the plungers 19, 20 at the relevant mutual placement of split ring 6 on the cylindrical glass 3 of the shaft 2 and the profile curve of the flange 4 of a cylindrical Cup 3 of the shaft 2 (Fig).

Continuously variable transmission (figure 4) in the embodiment, adder movements with overrunning clutch works the same way. The only difference lies in the fact that the overrunning clutch is built into leading gear wheels 17, 18 and off respectively when the pushers 19, 20 at the end of round split rings 6.

Thus, the security is provided not only a smooth change in speed, but the ability to adjust the transmission from zero up to the maximum speed, as well as the continuity of rotation of the drive component that extends the functionality of the continuously variable transmission.

Sources of information

1. As the USSR №118904, CL 21g, 101,47b, 29, 47h, 3, publ. 25.03.1959. Bull. No. 7 (prototype).

1. Continuously variable transmission containing a drive shaft associated with the leading element made in the form of an elastic loop with the ability to change it step by means of the control mechanism includes a helical gear, the shaft of which is connected through an adjusting nut and a bearing with an adjusting element and a driven element, which interacts with an elastic coil, characterized in that it includes the additional adder movements made in the form of a gear transmission, the slave element which is fixed on the driven shaft, and leading the links kinematically connected through a clutch and a driven element with an elastic coil, a drive shaft provided with a cylindrical glass, inside of which is placed the adjusting element control mechanism made in the form of inner and outer cylindrical sleeves coaxially mounted on the control shaft with the possibility of relative rotation and axial movement, while the elastic coil is made in the form of a split ring, is placed between the cylindrical stakana the drive shaft and an outer cylindrical sleeve of the control mechanism and pivotally connected to the said sleeves, and the slave element is designed as at least two spring-loaded to the split ring pushers, kinematically connected to the adder movements with the output shaft.

2. Continuously variable transmission according to claim 1, characterized in that each of the pushers fitted with a toothed rack, which interacts with a corresponding driving member adder movements.

3. Continuously variable transmission according to claim 1 or 2, characterized in that each of the pushers pivotally connected by means of a spherical head with anti-friction thrust bearing in contact with the split ring.

4. Continuously variable transmission according to claim 1, characterized in that the coupling adder movements made in the form of coupling couplings, installed on the leading links of gear and kinematically associated with the management of the profile curve performed on a cylindrical Cup drive shaft, or in the form of overrunning placed inside the leading elements of the gearing.



 

Same patents:

FIELD: mechanical engineering, namely, stepless mechanical transmissions, possible use in drives of various mechanisms and machines for stepless adjustment of speed of rotation of working organs from zero to given value.

SUBSTANCE: driving element of stepless transmission is made in form of resilient coil, capable of changing step by means of control mechanism. Resilient coil is represented by a split collar 6, positioned between barrel of driving shaft and external cylindrical bushing of control mechanism. Stepless transmission also contains adder of movements, made in form of toothed transmission, driven link of which is held on driven shaft 16, and driving links are kinematically connected through sleeves and driven element, made in form of at least two spring-loaded pushers 19,20, with split collar 6.

EFFECT: expanded functional capabilities of stepless transmission, ensures smooth change of speed and possible setting of zero speed, and also ensured continuous movement of driven element.

4 cl, 15 dwg

FIELD: transport.

SUBSTANCE: invention relates to bicycle with reciprocating pedals. Pedal 23 is fitted on pusher 21 provided with gear 20. Spring-loaded rack 16 has teeth on its both sides to engage with overrunning coupling 13, 14 and gear 20. Extra rack 22 is a stationary element. Gear 20 interacts with stationary rack teeth and those of spring-loaded rack 16. In pedal downward travel, spring-loaded rack stroke is doubled due to addition of two motions. Pusher translation with gear 20 and rotation driven by engagement od gear 20 with fixed rack 22.

EFFECT: increased speed.

3 cl, 4 dwg

Up!