RU2643863C1 - Gear transmission - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to mechanical engineering and can be used in gears lubricated with solid lubricants in powdery dispersed phase. Gear transmission comprises interfaced twin gears, each consisting of a body and a toothed crown with teeth. At the top of each tooth of each wheel, along its width, with an abutment to each face between the top and both lateral surfaces of the tooth and with a fit in the theoretical continuations of the calculated lateral surfaces of the tooth, a row of pyramidal teeth is located, whose height is less than the axial clearance of the transmission. And the teeth of both rows are offset relative to one another in the plan of the tip along its width by half the distance between the tips of these teeth.

EFFECT: ensuring high reliability of operation of the gear transmission.

1 cl, 4 dwg

Description

The invention relates to mechanical engineering, in particular to machine parts, and can be used in gears lubricated with solid lubricants in a powdered dispersed phase.

A gear is known, lubricated with a powder lubricant supplied to the lubrication zone by an aerosol method, containing mating paired gears, each of which consists of a body and a gear ring with teeth installed in a closed case with powder lubricant placed in it and a device for feeding it into lubrication zone - see, for example, “Drozdov Yu.N. et al. Friction and wear under extreme conditions: Reference book / Yu.N. Drozdov, V.G. Pavlov, V.N. Puchkov. - Engineering, 1986. - 224 p.: Ill. - (Fundamentals of machine design) ", p. 131.

The disadvantage of this design of the gear train is that a powdery lubricant lubricating the friction side surfaces of the teeth of the wheels, getting into the base areas of the valleys of the gear rims of the wheels, accumulates in the bases of these cavities and is compacted by rolling the tops of the teeth of the pair of wheels, forming a compacted layer that overlaps the dimensions of the interaxle clearance. Reducing this gap can cause mutual jamming of the mating teeth of the pair of wheels and the failure of these wheels. This reduces the reliability of the gear.

As a prototype taken gear, lubricated with a powdered lubricant supplied to the lubrication zone through a magnetic field. The gear train contains conjugate paired gears made of ferromagnetic material, installed in a closed case made of diamagnetic material, with a magnetically active powder lubricant placed in it, activated by a magnetic field source - see also page 134, Fig. 3.

The disadvantages of the prototype are the same as that of the analogue.

The invention solves the problem of improving the quality of the lubrication process and increasing the reliability of the gear transmission.

To do this, the gear transmission contains paired gears, each of which consists of a body and a gear ring with teeth. Moreover, on the top of each tooth of each wheel, along its width, adjoining each face between the top and both side surfaces of the tooth and inscribing into the theoretical extensions of the calculated side surfaces of the tooth, there are a number of pyramidal shaped teeth, the height of which is less than the axial clearance of the gear. And the teeth of both rows are offset relative to each other in terms of the top along its width by half the distance between the tops of these teeth.

The invention is illustrated by the drawing, which shows: a fragment of the gear transmission - end view (Fig. 1), cuts of the teeth of the gear wheel - side view (Fig. 2 and 3), the tooth view of this wheel is from the side of its top (Fig. 4 )

The drawing shows: gears 1 and 2, wheel bodies - 3 and 4, gears with teeth - 5 and 6, circles 7 and 8 of the tops of gears, circles 9 and 10 of the bases of gears, side surfaces 11 and 12 of tooth 5, top 13 of tooth 5, teeth 14 and 15, theoretical surfaces 16 and 17; axial clearance With transmission; the radius R _{b the} circumference of the vertices of the gear rim of the wheel 1; radius R _{o the} circumference of the bases of the gear rim of the wheel 1; the width of the ring gear wheel 1; the height b of the teeth (14 and 15); ₁ and the width of teeth; thickness a of ₂ teeth; the distance a ₃ between the tips of the teeth; the distance a ₄ from the top of the teeth (14, 15) to the body 4; directions ω ₁ and ω ₂ rotation of the wheels 1 and 2.

The gear transmission consists of paired gears 1 and 2, each of which consists of a body (3 and 4, respectively) and a gear ring with teeth (5 and 6, respectively). The circumference of the tops of the gears of the wheels (1 and 2) is 7 and 8, the circumference of the bases of the gears of the wheels (1 and 2) is 9 and 10. The axial clearance of the transmission is C. The teeth of the gears of both wheels (1 and 2) are made similar to each other . The implementation of the teeth of the wheels is shown on the example of the teeth 5 of the wheel 1. The tooth (5) is inscribed in a circle 7 and 8, the radii of which are R _b and R _o ; lateral surfaces of the tooth 11 and 12; the top of the tooth is 13; the width of the tooth is B. On top of tooth 13, 5, along its width (B), a row of teeth is located adjacent to both faces between tip 13 and tooth flanks 11 and 12 and fit into theoretical extensions 16 and 17 of the calculated lateral surfaces 11 and 12 14 and 15 of a pyramidal shape, the height b of which is less than the value C of the axial clearance of the transmission. The width of the teeth is a ₁ , the thickness of the teeth is a ₂ , the distance between the tops of the teeth is a ₃ . The teeth 14 and 15 of both rows are offset relative to each other in terms of vertices 13 along its width in the magnitude of half the distance and ₃ (a size _3/2) between their tops. From the peaks 14 (15) to the body 4 - the distance a ₄ .

When a gear train operates with lubricating the friction surfaces of the teeth of its gears with solid powder lubricant, this lubricant deposited on the surface of the base of the valleys of the gear rims of the gear wheels (not shown) and forming a layer overlapping the axial clearance C is removed during pairing of the gears during their rotation - by means of teeth 14 and 15, cutting off the settled lubricant and loosening it. Not removed by the teeth, but loosened by them, the lubricant from the zones of the bases of the depressions of the gear crowns self-deletes when the wheels rotate (ω ₁ and ω ₂ ). The offset of the teeth 14 and 15 of both rows of these teeth relative to each other allows you to cut (loosen) the settled lubricant over the entire width (B) of the gear rims, thereby improving the process of removing the settled lubricant (powder).

Compared with the prototype, the proposed gear design allows you to provide the necessary axial clearance between the paired pair of gears of the gear and thereby prevent jamming of the teeth of the mating gears; this increases the reliability of the gear.

Claims (1)

A gear transmission, lubricated mainly with solid lubricant in a powdery dispersed phase, containing mating paired gears, each of which consists of a body and a gear ring with teeth, characterized in that on top of each tooth of each gear wheel, along its width, adjacent to each face between the apex and both lateral surfaces of the tooth and with the inscription into the theoretical continuations of the calculated lateral surfaces of the tooth, a series of pyramidal teeth is located, the height of which is less than the reasons for the axial clearance of the gear transmission, and the teeth of both rows are offset relative to each other in terms of the vertex along its width by half the distance between the vertices of these teeth.

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