Motowheel

FIELD: transport.

SUBSTANCE: invention relates to vehicles and may be used in open space at extreme temperatures. Motowheel comprises case, motor and planetary reduction gear. Every planet pinion is made up of three wheels (8a, 8b, 9) fitted on common axle and coupled by elastically pre-strained elastically-compliant shafts 10. Outer surface of motor rotor 3 accommodates bushing 4 with ring element 5 that has cylindrical outer friction working surface interacting with outer friction working surface of central wheel 9 of each planet pinion. Motor stator 2 is arranged inside rotor 3. Motowheel case consists of two parts 6, 7, one part 6 is rigidly coupled with stator 2 while another one 7 may rotate. Inner surfaces of case parts are furnished with ring elements (11a, 11b) with inner friction working surfaces interacting with mating outer working surfaces of planet pinions (8a, 8b).

EFFECT: increased specific power output, possibility of operation in open space at temperatures approximating to 450 K.

4 cl, 5 dwg

 

The invention relates to a device movements and can be used to actuate various devices operating in the open space and extreme temperature conditions.

Known motor-wheel, containing an electric motor, planetary reducer in the form 2K-N-mechanism and the wheel hub [1].

A significant drawback of the known motor-wheel is the limit 1500÷2500 rpm maximum rotation speed of the motor, due to occur at high speeds, considerable dynamic components of the load in the mesh, and a small gear ratio that is implemented in a single stage planetary gearbox. Together, this leads to large weight and size parameters of the motor-wheel. In addition, due to the need to create good conditions lubrication of a significant number of heavily loaded friction pairings, this design cannot be used in the open space.

Known the closest in technical essence to the present invention is selected as a prototype electric motor-wheel [2], comprising a housing, a motor and planetary gearbox with zvocnim gearing comprising rigidly connected with the stator of the motor carrier with the Cam is new shafts, on the neck are placed epicycloids satellites introduced in engagement with the last zamochnoe wheel mounted through bearings on the driver, and the wheel hub, the motor-wheel is provided with a Central shaft-gear rigidly connected to the rotor of the electric motor, mounted in bearings caps were taken and brought into engagement with the involute satellites located on indigenous shakes eccentric shaft, and includes an overrunning clutch, the inner sprocket which is performed on part of the outer surface zivotnogo wheel, outer ring combined with the wheel hub, the rollers are located in the slots of the separator, the friction associated with the planet carrier, and between zvocnim wheel and the wheel hub is located bearings.

A significant disadvantage of this technical solution are:

- limited value 60÷80 gear ratio that is implemented in a single stage planetary gearbox, low power density (kW/kg) motor-wheel, due to limited 150÷200 rad/s the speed of the motor and a considerable mass of the gearbox, which together narrows the scope of its application in devices with high requirements for weight and size parameters, for example, working in aerospace technology;

- the inability to work in the open space is at temperatures exceeding 350-370 K, associated with the need to create good conditions lubrication of a significant number of heavily loaded friction pairs of this design.

The objective of the invention is to increase the power density of the motor-wheels and expand the functionality of its use in extreme temperature conditions (up To 450) and the open space.

This objective is achieved in that in the motor-wheel, comprising a housing, an electric motor with a rotor having an outer cylindrical surface, and the stator and planetary gearing comprising at least three satellites are installed evenly spaced around the circumference, with the possibility of rotation around its axis in the circumferential direction, the wheel is installed with the possibility of interaction with satellites, according to the technical solution of each of the satellites is made in the form of three installed on one axis and interconnected pre elastically deformed prohibitative shafts of the wheels with outer friction work surfaces and on the outer surface of the rotor placed narashima connected with the sleeve annular element having a cylindrical outer friction surface, installed with the possibility of interaction with the outer friction surface of the middle wheel of each of the cate the LTL, the stator of the electric motor housed within the rotor, the housing of the motor-wheel is made of two parts, one of which is rigidly connected with the stator, and the other mounted for rotation, while their inner surfaces are narashima associated ring elements with internal friction work surfaces, mounted for engagement with mating outer friction work surfaces placed on the ends of the wheels of each of the satellites, thus the value of δ (mm) pre elastic deformation prohibitative shafts of each of the satellites is

where T is the maximum torque generated by the motor-wheel, N·m;

L is the length provopoulos shaft satellites, mm;

E - modulus material provopoulos shaft satellites, MPa;

d - diameter provopoulos shaft satellites, mm;

- estimated mean value of the diameters of the internal friction of the working surfaces of the ring elements, respectively, the fixed and movable parts of the body, determined from the design parameters of the motor-wheel, mm;

f is the coefficient of sliding friction in the frictional connection of the working surfaces of the wheels of satellite and ring elements the building is a and the rotor hub;

n - number of satellites.

In the motor-wheel wheels of each of the satellites is made with barrel-shaped outer surface, return them to the inner surfaces of the ring elements of the body - torroidalnom and prohibitative shafts of each of the satellites is made of diameter d, we choose the ratio

where [σ] is the allowable stress in bending prohibitative shafts satellites, MPa,

at the same time on each part of the body has at least two annular element with internal friction work surfaces, each of which is mounted for engagement with the wheels of at least three satellites.

The proposed technical solution, increasing the power density and the ability to use the motor-wheel in extreme temperature conditions (up To 450) and the open space is achieved by the following:

the transmission of torque from the engine to the rotating part of the body is not engaged, as by frictional engagement of the respective working surfaces of the wheels satellites and ring elements;

- the position of the axis of the rotor is fixed relative to the axis of the stator in the space directly satellites, prohibitative shafts which will prefix is Ino provideversion, that allows you to exclude from the design of the bearings, radial and circumferential clearances and clearances and together to provide a high smooth functioning of interacting elements that in combination with the use of lightweight aluminum alloy in the manufacture of bushings, wheels satellites, housing and ring elements allows to increase the engine speed up to 8-20 thousand revolutions per minute and to reduce its weight and dimensions of 4-5 or more times, and the design can be used not only 3, but significantly more (6-18) the number of satellites that together can improve specific (kW/kg) the power of the motor-wheel.

- placement of the rotor of the electric motor inside rigidly associated sleeve, and placing the stator inside the rotating rotor allows to reduce the radial size of the structure while increasing the efficiency of magnetic fields;

- perform located on the ends of the satellite wheels with a barrel-shaped outer surface, and return them to the internal working surfaces of the ring elements of the toroidal housing allows you to provide valid contact pressure at smaller radii and dimensions of the wheels of the satellite and the housing, and ensuring the rational values of the radii r and R (r is the radius of the sphere, which in Isani" adjacent to the ends of the wheel satellites, R is the radius of curvature of the ring elements on the housing in axial section of the motor-wheel, R>r) allows you to save the gear ratio when the deformation axes and the associated shifts of the interacting elements of the transmission, and as an additional effect is achieved reliable fastening of the movable components of the system relative to each other in the axial direction.

Dependence to determine preliminary values of elastic deformation δ prohibitative shafts satellites obtained using well-known relations (see, for example, darks AV, Spiro G.S. Resistance materials: Textbook. for technology. higher education institutions. - 5th ed., revised and enlarged extra - M.: Higher. HQ., 1989. - 624 S.; SCR-270).

Prohibitative shafts satellites can be considered as a cantilever (on the middle wheel of the satellite) of a beam with a circular cross section of diameter d, loaded at the end by the concentrated load P, causing its deformation by the amount δ, where

Because value is the largest bending stresses in all prohibitative shafts satellites can be determined from the dependencies

where W is the moment resistance of the cross section provopoulos shaft satellites

the terms and conditions of strength and provision given force pressing the working surface is th

where J is the moment of inertia of circular cross section prohibitative shafts satellites, J≈0,05d4mm4;

E - the modulus of elasticity of the material prohibitative shafts satellites, MPa.

Figure 1 shows the motor-wheel; figure 2 is an enlarged view of the zone of interaction of the wheels of the satellites with the annular body and the rotor hub; figure 3 - electric motor-wheel with two annular elements on each of the housing parts; 4 and 5 - section respectively A-a and B-B figure 3.

The motor-wheel contains (1) axis 1 associated with the base (not shown), which narashima secure the stator 2 electrodevices. The rotor 3 is made in the form of a hollow cylinder, within which is placed the stator 2. The rotor 3 is placed narashima connected with the sleeve 4 with the annular element 5. The annular element 5 has a cylindrical outer friction working surface (not shown) with a diameter of DB.

The housing of the motor-wheel consists of two parts, one of which 6 is rigidly connected to the axle 1, and the other 7 mounted for rotation. Each of the satellites transmission (figure 1) is made in the form of three located on the same axis wheels:

- wheels 8A and 8b located on the ends of a satellite with a barrel (fit spherical surface the diameter d T) exterior friction surfaces;

- medium wheel 9 that is installed with the possibility of interaction with pre-loading normal to the surface of contact with the outer cylindrical friction surface of the ring element 5 due to the elastic deformation prohibitative shaft 10;

- rigidly connecting the wheel 9 with wheels 8A and 8b prohibitative shaft 10, having a length L, diameter d and made for example of spring steel.

On the inner surface parts 6 and 7 the body is placed a ring elements 11a and 11b having an inner friction surfaces, toroidal profile of these surfaces are made with a radius large 0,5dTin axial cross section, and mounted for engagement with the outer friction work surfaces, respectively, of the wheels 8A and 8b with pre-loading normal to the contact surface.

Internal friction working surface (not shown) of annular elements 11a and 11b of the outer friction surfaces (not shown) of the wheels 8A, 8b, 9 and the annular element 5 have a coefficient of friction f≥0,6 provided, for example, coating Al2O3thickness of 70÷100 μm, formed, for example, the anode-cathode microarc processing on the housing parts 6 and 7, the wheels 8A, 8b, 9 and annular ele is ante 5, made of aluminum alloys.

The toroidal surface of annular elements 11a and 11b have a maximum diameter of DK1. and DK2, the value of which is determined on the following basis.

When the rotation of the rotor 3 and rigidly connected therewith, the sleeve 4 and the annular element 5 with a diameter of DBon one revolution of the engine speed N with diameter dCmedium wheel 9 of each of the satellites and each satellite in General is

When the arc lengths l on the surface of diameter DK1associated with axis 1 fixed part of the body 6 and on the surface of diameter DK2associated with the output shaft of the movable part of the housing 7, is described by a line contact is placed at the ends of the satellite wheels respectively 11 and 11b, are

The angle γ of rotation (in radians) movable in the circumferential direction of the part 7 of the housing relative to the axis 1 motor-wheel is equal to

Since the gear ratio u is

or

Because

Taking into account expressions (15) and (17) the value of DKIcan be determined from the ratio

Here (subject to requirements to minimize size)

Preliminary elastic deformation (prohibitative shaft 10 satellites, providing required for transmission of torque, the contact force of the friction of the working surfaces of the ring elements 5, 11a, and 11b, respectively, of the wheels 8A, 8b, 9 to each other, each of the satellites is provided by determining the values of DK1and DK2from dependencies (16), (17), providing elastic deformation prohibitative shaft 10 by the value 8 (see figure 1). Displacement along the radius of the diameters DK1and DK2(see figure 2) surface area of the wheels 8A, 8b and the corresponding rings 11a and 11b arising from radial deformation prohibitative shaft 10 is so low that it practically does not change gear ratio. The movable part 7 of the housing is rigidly connected to the output shaft 12.

The motor-wheel is provided with a separator 13 made of antifriction material having an annular shape. In holes (not shown) of the separators 13 are radial gap axis 14 of the wheels 8A and 8b (axis 14 can be made in one piece with prohibitative shafts 10).

If necessary, increase the reliability of radial and settling the th base of the movable part 7 of the housing through the creation of additional radial bearings on the housing parts 6 and 7 can be performed in at least two offset value Δ relative to each other in the axial direction the ring element 11a111a2(part 6 of the body) and 11b1, 11b2(on movable in the circumferential direction of the part 7 of the housing)having an inner friction surfaces (figure 3).

In this case, in the motor-wheel is an additional group of at least three evenly spaced around the circumference of the satellites, the wheels of which 8A2and 8b2mounted for engagement with the respective annular elements 11a2, 11b2and the average wheel 9" - with the annular element 5. Working friction surfaces of the ring elements 11a1and 11b1interact with working friction surfaces respectively of the wheels 8a1and 8b1the main group of satellites. The average wheel 9' (Fig 3) communicates with the annular element 5. Primary and secondary groups of satellites are shifted relative to each other in the axial direction by the amount Δ (when creating three or more groups of annular elements increases the number of response groups of satellites). Each group consists of at least three evenly spaced around the circumference of the satellites that are installed so that each subsequent satellite was shifted in the axial direction relative to the value of Δ (Fig.3-5).

Transfers are done with eruditionem numbers u=500÷1000. Eyeliner supply reels (not shown) of the stator 2 through a hole (not shown) in the axis 1. Sleeve 4, the wheels 8A, 8b, 9, part 6 and 7 of the casing and the annular elements 11a and 11b of the motor-wheels are made of light, such as aluminum, alloys.

An example of the calculation of the parameters d, δ, DK1and DK2.

Source data: dC=dT=10 mm; DB=50 mm (determined by the design parameters of the engine); u=500 (determined by the number ratio of the required number of turns on the output and engine speed); T=80 N·m; L=20 mm; E=2,1·105MPa (material prohibitative shaft - spring steel); f=0,9 (coefficient of sliding friction in the joints friction work surfaces with oxidability on satellites and ring elements bushing carrier and housing); n=3; [σ]=600 MPa (estimated resource 10000 hours).

Then:

When calculating accepted DK1<DK2(2) for rotation of the rotor 3 and the output shaft 12 in one direction (otherwise, the rotor 3 and the output shaft 12 will rotate in opposite directions).

The motor-wheel is as follows.

BP is the communication speed ω 1of the rotor 3, which is created by the stator 2 of the motor is transmitted through the frictional coupling ring element 5 and the wheel 9 on prohibitative shafts 10. From prohibitative shaft 10 of each of the satellites, the rotation is transmitted to the wheels 8A, 8b. Wheels 8A and 8b due to frictional contact respectively with annular elements 11a and 11b, objetivas on their inner friction surfaces without sliding the difference in the diameters of annular elements 11a and 11b, rotate the movable part 7 of the housing with angular velocity ω21/u direct u>0) or reverse (u<0) the rotation of the rotor 3 direction. Same is the design of the motor-wheel, shown in figure 3. The presence of several ring elements (11a111a2and 11b1, 11b2) provides reliable fixation of the movable part 7 of the body when exposed to an external radial loads (not shown).

The use of the described construction the motor-wheel allows you to increase compared to existing 2-3 times more power density and to provide the possibility of working in the open space at temperatures up to 450 K.

1. Rudenko V.N. Planetary and wave transmission. Album designs. - M: mechanical engineering, 1980, p.87, the sheet 54. 2. Ibid, p.88, sheet 55, the scheme "a". (71).

2. Patent RU No. 2098694, CL IPC616H 1/32.

1. The motor-wheel, comprising a housing, an electric motor with a rotor having an outer cylindrical surface, and the stator and planetary gearing comprising at least three satellites are installed evenly spaced around the circumference, with the possibility of rotation around its axis in the circumferential direction, the wheel is installed with the possibility of interaction with satellites, wherein each satellite is made in the form of three installed on one axis and interconnected pre elastically deformed prohibitative shafts of the wheels with outer friction work surfaces and on the outer surface of the rotor placed narashima connected with the sleeve with the annular element having a cylindrical outer friction working surface, installed with the possibility of interaction with the outer friction surface of the middle wheel of each of the satellites, the stator of the electric motor housed within the rotor, the housing of the motor-wheel is made of two parts, one of which is rigidly connected with the stator, and the other mounted for rotation, while their inner surfaces are narashima associated ring elements with internal friction work surfaces, mounted for engagement with cvetnymi outer friction work surfaces placed on the ends of the wheels of each of the satellites, thus the value of δ (mm) pre elastic deformation prohibitative shafts of each of the satellites is

where T is the maximum torque generated by the motor-wheel, Nm;
L is the length provopoulos shaft satellites, mm;
E - modulus material provopoulos shaft satellites, MPa;
d - diameter provopoulos shaft satellites, mm;
- estimated mean value of the diameters of the internal friction of the working surfaces of the ring elements, respectively, the fixed and movable parts of the body, determined from the design parameters of the motor-wheel, mm;
f is the coefficient of sliding friction in the frictional connection of the working surfaces of the wheels of the satellite and the orbital elements of the housing and a rotor hub;
n - number of satellites.

2. The motor-wheel according to claim 1, characterized in that the wheel of each of the satellites is made with barrel-shaped outer surface, and return them to the inner surfaces of the ring elements of the body - torroidalnom.

3. The motor-wheel according to claim 1 or 2, characterized in that prohibitative shafts of each of the satellites is made of diameter d, we choose the ratio

where [σ] is the allowable stress in bending prohibitative shafts is atellites, MPa.

4. The motor-wheel according to claim 1 or 2, characterized in that each part of the body has at least two annular element with internal friction work surfaces, each of which is mounted for engagement with the wheels of at least three satellites.



 

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Electric motor // 2248657

FIELD: electrical engineering; gearless drives primarily used for vehicles.

SUBSTANCE: proposed motor has circular stator core with permanent magnets symmetrically disposed on its outer and inner surfaces over its circumference in alternating polarity and through core thickness in opposing polarity; it also has double-section rotor one of whose sections encloses stator and functions as external section while other section is disposed inside stator and functions as internal section. In addition motor has commutator-type current distributor and current collector both mounted for contacting commutator-type distributor segments and are connected to area of electromagnets of mentioned rotor sections.

EFFECT: enhanced motor torque.

3 cl, 2 dwg

Electric motor // 2248657

FIELD: electrical engineering; gearless drives primarily used for vehicles.

SUBSTANCE: proposed motor has circular stator core with permanent magnets symmetrically disposed on its outer and inner surfaces over its circumference in alternating polarity and through core thickness in opposing polarity; it also has double-section rotor one of whose sections encloses stator and functions as external section while other section is disposed inside stator and functions as internal section. In addition motor has commutator-type current distributor and current collector both mounted for contacting commutator-type distributor segments and are connected to area of electromagnets of mentioned rotor sections.

EFFECT: enhanced motor torque.

3 cl, 2 dwg

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