RU2102644C1 - Mechanism of accurate rectilinear motion of point - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: mechanism includes main and additional sun wheels, carrier, satellite, additional wheels designed for connection with carrier and for linkage with additional sun wheel. Diameter of satellite exceeds radius of sun wheel. Satellite is mounted on carrier for rotation at speed equal to speed of carrier and opposite relative to it and different relative to additional sun wheel. Points of satellite which are located at distance from its axis equal to amount of eccentricity of carrier perform accurate rectilinear motion. EFFECT: enhanced accuracy of motion. 3 dwg

Description

 The invention relates to the field of engineering, in particular to the creation of an exact rectilinear motion of a point.

 There is a known mechanism for the exact rectilinear movement of a point [1] whose disadvantage is that in order to ensure accurate rectilinear movement of the slider, an additional guide link is necessary, causing a reaction between the slider and the guide link.

 The closest in essence is the planetary mechanism, containing a fixed central wheel, carrier and satellite [2] the disadvantage of which is its limited use in power machines due to the tight connection between the diameter of the satellite and the radius of the carrier, the use of high-strength materials, and in gears wheel correction with small eccentricities drove.

 The purpose of the invention is the expansion of the possibility of using the mechanism in various machines.

при R₃=E получаем ω₁0, т.е. известную схему планетарного механизма.This goal is achieved by the fact that in the proposed device the size of the satellite is increased without changing the eccentricity of the carrier (radius E. /, and the stationary central wheel is made movable and supplemented by an additional central wheel rigidly connected to it, which, through the additional wheel, is rigidly connected to the carrier, and combines their additional wheel with its own support provides the same balance of speeds as in the planetary mechanism, while the contact point of the satellite with the main central wheel schaetsya rotational speed in opposite directions of rotation speed of the carrier and having a value

for R ₃ = E we obtain ω ₁ 0, i.e. known scheme of the planetary mechanism.

В проекциях на оси X-Y это выражение запишется так:
V_Ax=V_Bx+V_ABx; V_Ay=V_By-V_ABy.In FIG. 2 shows that the speed of point A on satellite 3 is composed of vectors of two speeds

In projections on the XY axis, this expression is written as follows:
V _Ax = V _Bx + V _ABx ; V _Ay = V _By -V _ABy .

таким образом должно выполняться равенство ω₃= -ω₂.Point A will make an exact rectilinear motion if V _Ay = 0. This is possible if V _By = -V _ABy . 1 From figure 2 it follows:

thus, the equality ω ₃ = −ω ₂ must be satisfied.

In this case, T. A moves at a speed
V _A = V _Ax = 2EW ₂ • sin (φ ₂ )
or V _A = ω ₂ • OA since OA = 2E • sin (φ ₂ ).

Obviously, Comrade O is the instantaneous center of velocities of all satellite points. For t. C we write
V _C = V _CO = ω ₃ • CO = ω ₃ (R ₃ -E)
or
V _C = ω ₁ R ₁ = ω ₁ (R ₃ + E).

На фиг.3 показаны несколько положений мгновенного центра скоростей т. О и точек A, B, C.Using the condition of the rectilinear motion of t. A ω ₃ = -ω ₂ we obtain the required frequency and direction of rotation of the central wheel 1:

Figure 3 shows several positions of the instantaneous center of velocities of the O. and points A, B, C.

Consequently, point A can move exactly rectilinearly with speed V _A both when the central wheel is stationary and when it is moving, when the satellite has a diameter larger than the radius of wheel 1.

 Figure 1 is an isometric view of the proposed mechanism, consisting of a block of central movable wheels 1-1 ', where 1 is the main central wheel, and 1' is an additional central wheel, and also from the carrier 2 in the block with an additional wheel 4, satellite 3 and additional wheel 5 with a support for connecting the kinematic connection of the wheels 5 and 1 '.

 The mechanism works as follows: when the carrier 2 rotates through the axis with the eccentricity E, the satellite 3 is driven, and through the additional wheel 4 connected rigidly with the carrier, the additional wheel 5 and the additional wheel 1 'specify the angular side speed of the central wheels 1-1'. In this case, the peripheral speed in engagement will be directed opposite to the peripheral speed of the axis of the satellite connected to the carrier, which provides the satellite with such a picture of the linear velocities of its points at which there is an instantaneous center of velocities, and the points that are apart from the satellite axis by eccentricity E moving exactly rectilinearly .

In FIG. Figure 1 shows the speed plan of the points on the links of the mechanism, where V _{is the} speed of the axis of rotation of the satellite, the position of which is determined by the eccentricity of E. Point O is the instantaneous center of velocities of all points on the satellite 3. V _{A is the} speed of point A, which performs exactly rectilinear motion. V _{C is the} speed of point C directed in the opposite direction to create an instantaneous center of velocities 0. V _{D is} the contact speed of wheels 4 and 5, V is _the contact speed of wheels 1 'and 5.

 The proposed solution has novelty, inventive step and industrial applicability.

 The possibility of using the mechanism is expanded by the presence of two shafts 2 and 4 having different rotation speeds, each of which can be a drive shaft.

Из формул видно, что подбором радиусов звеньев можно получить различную частоту вращения вала 5 по сравнению с частотой вращения водила 2.You can use the following calculation formula:

From the formulas it can be seen that by selecting the radii of the links it is possible to obtain a different rotational speed of the shaft 5 in comparison with the rotational speed of the carrier 2.

Claims (1)

 The mechanism of the exact rectilinear movement of a point containing a central wheel, carrier and satellite, characterized in that it is rigidly connected to the main additional central wheel, which is installed in the mechanism with rotation, and additional wheels, of which one is rigidly connected to the carrier, the other is installed on the shaft for communication of the carrier with an additional central wheel, and the satellite is made with a diameter larger than the radius of the central wheel interacting with it, and mounted on the carrier with the possibility rotation with a speed equal to and opposite to the directional speed of the carrier and different from the speed of the additional central wheel, at which the satellite points relative to its axis by the amount of carrier eccentricity have the ability to make precise rectilinear movement.

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