RU2426023C2 - Gear - Google Patents

Gear Download PDF

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Publication number
RU2426023C2
RU2426023C2 RU2009131223/11A RU2009131223A RU2426023C2 RU 2426023 C2 RU2426023 C2 RU 2426023C2 RU 2009131223/11 A RU2009131223/11 A RU 2009131223/11A RU 2009131223 A RU2009131223 A RU 2009131223A RU 2426023 C2 RU2426023 C2 RU 2426023C2
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RU
Russia
Prior art keywords
tooth
teeth
radius
curvature
wheel
Prior art date
Application number
RU2009131223/11A
Other languages
Russian (ru)
Other versions
RU2009131223A (en
Inventor
Игорь Евгеньевич Филимонов (RU)
Игорь Евгеньевич Филимонов
Павел Андреевич Прокудин (RU)
Павел Андреевич Прокудин
Original Assignee
Государственное образовательное учреждение высшего профессионального образования Уральский государственный технический университет - УПИ имени первого Президента России Б.Н. Ельцина
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Application filed by Государственное образовательное учреждение высшего профессионального образования Уральский государственный технический университет - УПИ имени первого Президента России Б.Н. Ельцина filed Critical Государственное образовательное учреждение высшего профессионального образования Уральский государственный технический университет - УПИ имени первого Президента России Б.Н. Ельцина
Priority to RU2009131223/11A priority Critical patent/RU2426023C2/en
Publication of RU2009131223A publication Critical patent/RU2009131223A/en
Application granted granted Critical
Publication of RU2426023C2 publication Critical patent/RU2426023C2/en

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Abstract

FIELD: machine building.
SUBSTANCE: gear consists of driving and driven tooth spiral wheels. Teeth of the driving wheel do not have dedendums. The teeth of the driven wheel are formed with recesses. At end cross section of wheels radius R of curvature of addendum of the driving wheel is constant and is equal to constant radius of curvature of the conjugated to it recess of the driven wheel. In normal cross section the tooth of the driving wheel has a profile of half of ellipse with radial arrangement of its bigger axis.
EFFECT: maximum allowed load capacity.
5 dwg

Description

The gear transmission can be used in mechanical engineering, in particular, as a helical gear with gearing, providing the maximum possible load capacity. Known transmission G.P. Grebenyuk [1], adopted for the prototype, in which the teeth are made with heads and interdental cavities, and in the cross section of the wheels the radius of curvature of the tooth head is equal to the radius of curvature of the interdental cavity mating with it. The increase in the load capacity of the helical gear (figure 1) to the maximum possible compared with the prototype is provided by reducing the height of the tooth due to the exclusion of the tooth legs. In this case, in a gear transmission containing the driving and driven gears, the teeth of the driving wheel are made by heads, the teeth of the driven wheel are formed by troughs. In the end section, the tooth of the drive wheel is outlined by an arc of a circle R, i.e. has a constant radius of curvature at any point. The tooth gearing of the driving wheel occurs with the surface of the depression of the driven wheel, which in the end section is outlined by an arc of a circle of the same radius, and has a rounding at the edges. The gear wheels are helical. In a normal section, the tooth profile of the drive wheel is in the form of an ellipse with a radial arrangement of the larger axis of the ellipse.
The semimajor axis a (Fig. 2) is the height of the tooth head and therefore the value is constant, then the semimajor axis is determined from the dependence of the ratio of the axes of the ellipse on the angle of inclination of the teeth to the axis of the wheels α. In engagement, it is assumed that the radius R is numerically equal to the height of the tooth head, i.e. a = R.
Since DE = b (Figs. 3, 4 and 5), hence DF = cosα = 2a: 2b = a: b. Accordingly, a: b = cosα. This relation is valid for any angle α.
With the same angle of inclination of the teeth α of the driving and driven wheels, the rotation of the driving wheel leads to the engagement of the convex tooth surface of the driving wheel with the concave surface of the cavity of the driven wheel, providing the rotation of the latter. The line of contact of the surfaces of the profiles of the wheels represents a quarter of a circle of radius R, which during the gearing-rolling process moves along the width of the wheels. If the driving and driven wheels have different angles of inclination of the teeth α 1 ≠ α 2 , then the engagement is accompanied by an additional sliding profiles on each other.
When the gear pair is rotated, the instantaneous contact of the tooth and the cavity moves along the axis of rotation until the next tooth of the drive wheel engages with the next cavity of the driven wheel. The maximum contact of the tooth and the cavity is provided at any moment of rotation of the wheel.
In this case, the width of the gearing is determined by the necessary overlap coefficient depending on the pitch and the angle of inclination of the teeth.
By reducing the angle of inclination of the teeth in the helical gear to an acceptable minimum, at the same time, it is possible to achieve the maximum possible increase in the contact spot of the teeth and troughs with the positive feature that this contact spot is evenly distributed over the entire height of the contacting teeth, since the radius of curvature of the tooth of the drive wheel is equal to the radius the curvature of the hollow cavity over the entire surface. To eliminate possible jamming from heating during gear operation, guaranteed clearances are provided, which are taken into account in the calculation formulas.
In addition, due to good lubrication conditions, the proposed gear transmission has increased wear resistance of the teeth and reduced friction losses in gearing.
Since the radius of curvature of the tooth along the entire profile does not change, this eliminates the presence of stress concentrators and contributes to the durability of the mechanism.
The source of information
1. RU 2057267 C1 (Grebenyuk Gennady Petrovich), 03/27/1996.

Claims (1)

  1. A gear transmission containing the driving and driven gear helical gears, in which the teeth of the driving wheel are made by heads and the driven wheel are formed by troughs, while in the end cross-section of the wheels, the radius of curvature of the tooth head of the driving wheel is constant and equal to the constant radius of curvature of the driven wheel cavity mating with it , and in a normal section, the tooth has a profile of half an ellipse with a radial arrangement of its larger axis.
RU2009131223/11A 2009-08-17 2009-08-17 Gear RU2426023C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2009131223/11A RU2426023C2 (en) 2009-08-17 2009-08-17 Gear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2009131223/11A RU2426023C2 (en) 2009-08-17 2009-08-17 Gear

Publications (2)

Publication Number Publication Date
RU2009131223A RU2009131223A (en) 2011-02-27
RU2426023C2 true RU2426023C2 (en) 2011-08-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
RU2009131223/11A RU2426023C2 (en) 2009-08-17 2009-08-17 Gear

Country Status (1)

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RU (1) RU2426023C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU170915U1 (en) * 2016-09-15 2017-05-15 Акционерное общество "Научно-производственная фирма "Микран" Gear

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU170915U1 (en) * 2016-09-15 2017-05-15 Акционерное общество "Научно-производственная фирма "Микран" Gear

Also Published As

Publication number Publication date
RU2009131223A (en) 2011-02-27

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MM4A The patent is invalid due to non-payment of fees

Effective date: 20120818