High-torque non-friction variable-speed drive

FIELD: mechanical engineering.

SUBSTANCE: invention is designed for stepless change of gear ratio in transmissions at high transmitted power. Proposed variable-speed drive contains input and output shafts, vibratory mechanism set into operation by input shaft with pair of vibratory shafts operating at relative 90° phase shift, flywheels, three-shaft gear differential mechanically coupled with output shaft by carrier and pair of vibration equalizers. Driving shafts of vibration equalizers are vibratory shafts, and driven shafts are shaft of differential gears. Variable-speed drive is furnished with flywheel rigidly connected with shafts of differential gears with inertia moment J applied to said shafts. Inertia moment J is related to moment on carrier Mc according to expression Mc<4Jω2(λ/π)u, where ω is speed on input shaft, λ is swing of vibrations of vibratory shaft and u is gear ratio between vibratory shaft and shaft of differential gear.

EFFECT: improved operating characteristics, simplified design and reduced cost of variable-speed drive.

2 cl, 5 dwg

 

The present invention relates to mechanical engineering and is designed for smooth change of gear ratio transmission machines with a large transmit power.

Known variable speed, in which the time from the input to the output shaft is transmitted through the oscillating mechanism with oscillating shafts, rectifiers oscillations with overrunning clutches and three-shaft differential, and a smooth change of gear ratio is achieved by the change of the amplitude of oscillation of the oscillating shaft [2-6]. The differential provides a high uniformity of rotation of the output shaft of the variator.

Oscillatory mechanisms are divided into dynamic and kinematic. In dynamic oscillatory mechanisms amplitude of oscillations depends on the torque on the output shaft [1, str, Risa], i.e. an automatic change gear ratio of the variator: with increasing moment load output shaft speed decreases and Vice versa. The drawback of such a variable is large unevenness of rotation of the output shaft of the variator. Kinematic oscillatory mechanisms (Cam [2-4] and nicolasnova [5, 6]) is equipped with a mechanism of forced change of the amplitude of oscillations of an oscillatory shaft, allowing changes the gear ratio of the variator. A disadvantage of this type of variable-speed drives one is in the lack of automatic changes of gear ratio and the complexity of the design. In [7] it is shown that in the progressive transmission [2-4] for a fixed amplitude of oscillation of the oscillating shaft from overrunning action of the overrunning changes the speed of the output shaft, but only at relatively low load torques.

Let us assume the prototype is closest to the technical essence and the achieved result, high-torque variable non-friction type [4], containing the input and output shafts, driven from the input shaft oscillating Cam mechanism with a pair of operating with a relative phase shift of 90° an oscillatory shaft, three-shaft gear differential with kinematically rigidly connected with the output shaft planet carrier, and a pair of rectifiers fluctuations, the drive shafts which oscillatory shafts, and driven - shafts of the wheels of the differential, while the oscillating mechanism provided with a mechanism of change gear ratio of the variator for compulsory change of the amplitude of oscillation of the oscillating shaft.

Signs of a well-known mechanism (prototype), coinciding with the claimed invention, the following. Known torque variator non-friction type contains the input and output shafts, driven from the input shaft oscillation mechanism with a pair of operating with a relative phase shift of 90° an oscillatory shaft, three-shaft gear differential with kinematically with is provided with an output shaft planet carrier, and a pair of rectifiers fluctuations, the drive shafts which oscillatory shaft, and the driven - shaft wheel differential.

Known variator has a rather bulky design because of the presence of mechanisms for changing the gear ratio of the variator and the automatic changes of gear ratio due to the overrunning action of the overrunning takes place only at low points on the output shaft, which degrades its performance characteristics.

The purpose of the present invention is to improve performance, simplify and cheapen the construction.

We offer high torque variator non-friction type has the following essential features. It contains the input and output shafts, driven from the input shaft oscillation mechanism with a pair of operating with a relative phase shift of 90° oscillatory shafts, flywheels, three-shaft gear differential with kinematically connected with the output shaft planet carrier, and a pair of rectifiers fluctuations, the drive shafts which oscillatory shafts, and driven - shafts of the wheels of the differential, which is kinematically connected with the flywheels.

These essential features are complemented by the following: flywheels are made to force the variable moment of inertia.

Distinctive features of the prototype characteristic of the invention is the following: the proposed fur the lowland equipped with kinematically connected with the shafts of the wheels of the differential flywheels.

In addition, in the proposed mechanism flywheels are made to force the variable moment of inertia.

Figure 1 is a given circuit design, high-torque variator non-friction type, figure 2 and 3 - speed shaft of the variator, figs.4 and 5 - construction option.

The variator (1) contains mounted in bearings of the housing 1 input 2 and output 3 shafts, operating on the input shaft of the oscillating mechanism 4 with a pair of oscillating shafts 5A and 5b, which rollers rectifiers fluctuations 6A and 6b. Also contains three-shaft gear differential with the shafts of the wheels of the differential 7a and 7b, a planet carrier 8, 9 satellites and the wheels of the differential 10A and 10b. Carrier 8 of the differential is connected by toothed wheels 11 and 12 with the output shaft 3. Slave shafts rectifiers fluctuations are the shafts of the wheels of the differential 7a and 7b that the gear wheels 13 and 14 are connected with flywheels 15A and 15b (JM- moment of inertia of the flywheel). Rectifiers contain a pair of overrunning clutches 16, transmitting from the oscillating shaft 5 through the gears 17 and 18 wheels unidirectional rotation of the shafts of the wheels of the differential gear 7. The output shaft 3 transmits the rotation to the consumer of mechanical energy 19.

The variator works as follows (figure 1). From the input shaft rotating speed ω2driven oscillating mechanism 4, the output sonacotra - oscillatory shafts 5A and 5b are fluctuations λ and rotate with alternating speeds ω5aand ω5bwhile these shafts operate with a relative phase shift of 90° (2), i.e.,

where α - the angle of rotation of the input shaft.

Oscillatory shafts through rectifiers fluctuations 6A and 6b, by overrunning, according to unidirectional rotation of the shafts of the wheels of the differential 7a and 7b, ωandand ωbtheir angular velocity, and the wheels of the differential gear 10 through 9 satellites transmit the rotation of the cage 8, the speed of which is equal to

Drove through gears 11 and 12, rotates the output shaft 3, loaded moment of resistance M3the consumer of mechanical energy 19, the angular velocity of the output shaft (Z - number of teeth of the wheels)

MBand JB- drag torque and moment of inertia reduced to the axis of the carrier. JBbig enough as it depends on the inertia of the consumer. J - moment of inertia reduced to the axis of each shaft of the wheels of the differential gear 7 and mainly depends on the moment of inertia of the flywheel JMthat rotates with the wheel shaft of the differential.

We denote the threshold time

whereu - transmit the offered relation between oscillatory shaft

5 and the wheel shaft of the differential gear 7.

Speed ωandand ωbconsequently, ωBdepend, as follows from (1), the velocity of the oscillating shafts, as well as from the work of the overrunning mode of overtaking. As shown in [7], for variator Cam oscillating mechanism mode overtaking occurs when MB<2 MP. Figure 3 gives the speed of the shafts of the wheels of the differential gear and drove when JB=100J and different moment of resistance MBwhere you can see that the variation of the speed automatically: if MB=0, we have max speed ωB=2ω0and when MB≥2MP- minimum ωB0i.e. the speed is changed without changing the amplitude of oscillations λ oscillating shafts. The range of MIndepends substantially, as follows from (2), moment of inertia JMthe flywheel.

Figs.4 and 5 show a variant of the design of the flywheel, made with a force variable moment of inertia JM. In the slots 20 of the flywheel 15 is installed massive floaters, 21, associated with ear-rings 22 with cuttings 23. The axial displacement of the layers by the handle 24, which causes the radial movement of the sliders 21, therefore, changes the moment of inertia of the flywheel JM. This design greatly extends the operational characteristics of the variable.

The presence of a differential in the proposed design provides a high uniformity of rotation of the output shaft of the variator.

In the proposed variable-speed drive of the oscillating mechanism can be as dynamic[1], and kinematic [2-5]. And kinematic oscillatory mechanisms - Cam or nekurackymi, with a fixed amplitude of oscillations (λ=const) or variable (λ=var), the latter has a greater range of functionality, but is structurally more complex and more expensive.

The reverse of the variator is provided by reverse overrunning.

Sources of information

1. Have. Mechanical stepless transmission non-friction type. - M.: Mashinostroenie, 1977.

2. EN 2169870 C2, F16H 29/08, 14.05.1999 (Bview).

3. EN 2204749 C1, F16H 29/08, 05.11.2001 (Bview).

4. EN 2242654 C2, F16H 29/08, 20.01.2003 (Bview).

5. EN 2179673 C1, F16H 29/08, 03.07.2000 (Bview).

6. EN 2263240 C2, F16H 29/08, 25.11.2003 (Bview).

7. Bview. Fundamentals of dynamics, high-torque variable-speed drives. // Bulletin of engineering. 2004. No. 7. P.16-22.

1. Torque variator non-friction type, containing the input and output shafts, driven from the input shaft oscillation mechanism with a pair of operating with a relative phase shift of 90° an oscillatory shaft, three-shaft gear differential with kinematically connected with the output shaft planet carrier, and a pair of ViPr is Michela fluctuations, the drive shafts are oscillatory shaft, and the driven - shaft wheel differential, characterized in that provided kinematically rigidly connected with the shafts of the wheels of the differential handwheel is given to the shaft moment of inertia J, related to the torque on the driver Minco-relation of Min<4Jω2(λ/π)u,

where ω - the speed of the input shaft;

λ - the amplitude of oscillations of an oscillatory shaft;

u - gear ratio between the oscillating shaft and the wheel shaft of the differential.

2. Torque variator non-friction type according to claim 1, characterized in that the flywheels are made to force the variable moment of inertia J.



 

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