RU2390678C1 - Gear - Google Patents

Abstract

FIELD: machine building. ^ SUBSTANCE: gear consists of pair of conjugated tooth wheels. Volumes of recesses between teeth of each wheel of the gear, not occupied with teeth of conjugated wheel at engagement, are filled with insertions secured in recesses and made out of flexible material, for example rubber. Minimal gaps are left between the insertions and tops of teeth of the conjugated wheel. ^ EFFECT: optimisation of lubrication mode and reduced consumption of lubricant. ^ 2 dwg

Description

The invention relates to mechanical engineering, namely to machine parts, and can be used in open gears.

A gear is known, including a pair of mating gears (see, for example, “P. Guzenkov. Machine Details: Textbook for Universities, 4th ed., Rev. - M.: Higher School, 1986, 359 pp. , ill., p. 154).

The disadvantage of this design is that the grease deposited on the working surfaces of the teeth, during transmission, is displaced from there by the mating teeth of the wheels, in particular into the cavities between the teeth, and is not involved in the further friction of the teeth.

As a prototype taken gear design, including a pair of mating gears - see "V. Zapletokhin The design of parts of mechanical devices: a reference. - L .: Engineering, Leningrad Branch, 1990, 669 p., Ill., P. 427.

The disadvantage of this design is that when lubricating the gear with a grease, this material is displaced by the mating teeth of the wheels from the working surfaces of the teeth, in particular into the cavities between the teeth, and is not involved in the process of friction of the teeth, which worsens the friction process. In addition, as the modulus (m) of the gears increases, the size of the depressions between the teeth also increases, which leads to an increase in the amount of lubricant displaced into these depressions. So, for example, with a module m = 100, the radial clearance between the mating teeth is

c = (0.25 / 0.4) m,

take the coefficient 0.4:

s = 0.4 · 100 = 40 (mm)

(see Ivanov M.N. Machine details: a textbook for engineering specialties of universities, 4th ed., rev. - M.: Higher School, 1984, 336 pp., ill., p. 99).

With large diameters of the wheels and a large width of the gear rims, the volumes determined by the magnitude of the radial clearances between the teeth of the wheels and the width of their rims are significant. So, for example, with m = 100, this volume for one wheel as a whole will be:

V = s · b · s · n (mm),

where c is the size of the end gap;

b is the width of the crown;

s is the width of the depression;

n is the number of depressions.

- Number of depressions (number of teeth z):

z = D · π / t,

where D is the diameter of the wheel;

t is the pitch of engagement,

t = πm

- cavity width (tentatively):

s = πm / 4

- crown width

b = ψ

where ψ is the coefficient of tooth length,

(ψ = 6/37, take ψ = 10)

With a wheel diameter of 6000 mm and m = 100:

t = 3.14 · 100 = 314 (mm)

z = 6003.14 / 314 = 60

s = 3.14 · 100/4 = 78.5 (mm),

b = 10 · 100 = 1000 (mm),

then

V = 0.04 · 1.0 · 0.0785 · 60 = 0.188 (m ³ )

This leads to a significant overspending of the lubricant, which is spent on filling the cavities between the teeth of the wheels.

The invention solves the problem of optimizing the lubrication mode and reducing the consumption of lubricant.

For this purpose, the gear includes a pair of mating gears, and the volume of the depressions between the teeth of each wheel, not occupied by the gear teeth of the mating wheel, is filled with reinforced inserts made of an elastic material, such as rubber.

The invention is illustrated by drawings, which depict a pair of mating gears (figure 1) and a fragment of gearing (figure 2).

A gear transmission consists of a pair of mating gears 1 and 2 with gears with teeth 3 and 4. Between the diameter of the tops of the teeth of one wheel (D _ver ) and the diameter of the depressions of the other wheel (D _VP ) there is a radial clearance (C). The volumes of the hollows of each wheel over the entire width of the rims of the wheels, not occupied by the mating teeth of the other wheel, are filled with inserts 5 reinforced in them, the inserts are made of elastic material, for example rubber, and minimal gaps (Δ) are made between the inserts and the tops of the teeth of the mating wheel to prevent their contact in the process of engagement of the teeth of both wheels.

This gear works as follows.

When the mating wheels are engaged, the teeth (3) of one wheel (1) enter the depressions between the teeth (2) of the other wheel (4), displacing the previously applied lubricant from the engagement zone, including the zones of depressions adjacent to the bodies of the wheels 1 and 2. The presence of inserts 5 does not allow the lubricant to accumulate in the cavities between the teeth and to be excluded from the process of friction between the teeth. The presence of a minimum clearance (Δ) between the tops of the teeth of one wheel and the inserts of the other wheel does not allow them to engage during gear operation, and the implementation of inserts made of elastic material allows wheels 1 and 2 to change the center distance between them, for example, with defects in wheel mounting on shafts or with changes in clearances during transmission operation.

Claims (1)

A gear transmission, mainly coarse-grained, lubricated with a grease, including a pair of mating gears, characterized in that the volumes of the depressions between the teeth of each wheel, which are not occupied by the teeth of the mating gear, are filled with inserts made of elastic material, such as rubber, reinforced in them and between the inserts and the tops of the teeth of the mating wheel made the minimum gaps.

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