RU2595053C1 - Gear wheel - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used in tooth gears lubricated by plastic lubricants. Gear wheel includes a body, a gear rim with teeth and a pair of end butts with external diameters equal to diameter of the addendum circle, and with inside diameter smaller than diameter of the circle of the teeth bases. Adjustment are made of different thickness in radial plane of the wheel, and have maximum depth in the area of tooth tips and minimum - at tooth root fillets. Thickness taper is one-stage. Butts are secured on the teeth ends and sections of the ends of the body adjacent to the rim. Each butt is composite, consisting of two separate concentric circular butts. Circular butts are different from each other by value of said thickness and adjoin each other along a border of changing their mutual thickness. Butt of less thickness along its outer perimeter is fixed also on the inner perimeter of the second butt, for this purpose it is equipped with annular projection located perpendicular to its outer end.

EFFECT: saving material when making gear wheel.

1 cl, 1 dwg

Description

The invention relates to mechanical engineering, in particular to machine parts, and can be used in heavily loaded gears with large-modular wheels lubricated with plastic lubricants.

A gear wheel is known that contains a body, a ring gear with teeth, and a pair of end ring linings mounted on the ends of the teeth, the outer diameter of the linings is equal to the diameter of the circle of the tops of the teeth, and their inner diameter is larger than the diameter of the circle of the tooth cavities - see, for example, USSR AS No. 1578406 , cl. F16H 55/12, publ. 07/15/90, bull. No. 26. Ring pads connecting the teeth of the wheel, increase their bending strength and help prevent tooth fractures.

The disadvantage of this gear wheel is that when the teeth of the wheel are lubricated with plastic lubricant, this material is displaced from the gearing area of the wheel (from the side surfaces of its teeth) with the twin gear wheel - to the ends of the wheel (through the gaps between the end ring plates and the wheel body ), the lubricant enters the ends of the teeth and the ends of the wheel body. In this case, the displaced lubricant is excluded from the process of lubricating the side (working) surfaces of the teeth of the wheel, this intensifies the processes of wear of the teeth and contributes to the overexpenditure of the lubricant.

As a prototype taken gear design according to the patent for the invention of the Russian Federation No. 2529941, class. F16H 55/12, publ. 10/10/2014, bull. No. 28. Its essence lies in the fact that the gear wheel consists of a body, a gear ring with teeth and a pair of end ring pads mounted on the ends of the teeth and parts of the ends of the body adjacent to the gear ring; the outer diameter of the linings is equal to the diameter of the circumference of the tops of the ring gear; pads are made of varying thickness in the radial plane of the wheel; in the area of the tooth heads, the thickness of the pads is maximum, and in the area of the tooth legs and the wheel body is minimal, and the thickness change is performed in one step. The sections of the pads adjacent to the heads of the teeth and having a large thickness perform a power function, linking the teeth of the wheel to each other and increasing their bending strength. The areas of the linings adjacent to the tooth legs and the wheel body, and having a smaller thickness, perform a sealing function, preventing the lubricant from being displaced from the tooth engagement zone to the wheel ends and localizing the gear engagement zone.

The disadvantage of the prototype is that the end ring pads along the entire width are made whole, while the function of different sections of the pads (along the radius of the wheel) are different: thickened sections of pads mounted on the ends of the tooth heads perform a power function and are subject to stress that experience the teeth of the wheel when they are loaded in the gear. And the remaining sections of the pads (of smaller thickness) are not intended for the perception of loads (they perform only a sealing function, separating the tooth engagement zones - the troughs of the ring gear - from the ends of the wheel). Fulfillment of the integral plates leads to an unjustified overspending of the material used for their manufacture, in particular metal, as a durable material necessary for the manufacture of power sections of the plates.

The invention solves the problem of optimizing the design of the gear wheel.

To this end, the gear wheel consists of a body, a ring gear with teeth and a pair of end plates with an outer diameter equal to the diameter of the circle of the tops of the teeth and with an inner diameter smaller than the diameter of the circle of the base of the teeth, made of different thicknesses in the radial plane of the wheel, having a maximum thickness in the region of the heads teeth and the minimum in the area of the legs of the teeth, in which the change in thickness is performed in one step and which are mounted on the ends of the teeth and on the parts of the ends of the body adjacent to the ring gear. Each pad is made of composite, consisting of two separate concentric annular linings, different from each other in the magnitude of the above thicknesses, adjacent to each other along the border of the change in their mutual thickness; moreover, the lining of smaller thickness along its outer perimeter is also mounted on the inner perimeter of the paired lining, for which it is equipped with an annular protrusion located perpendicular to its outer end.

The invention is illustrated in the drawing, which shows a fragment of a gear wheel - side view in section.

The drawing shows: the body 1 of the wheel, the ring gear with teeth 2, power ring pads 3 and 4, additional ring pads 5 and 6, ring protrusions 7; diameter D _{in the} circumference of the tops of the ring gear; diameter D _{about the} circumference of the bases of the ring gear; width C ₁ power pads; width C ₂ additional pads; inner diameters D _{1 of the} power plates, inner diameters D _{2 of the} additional plates, outer diameters D _{3 of the} annular protrusions.

The gear wheel consists of a body 1 and a ring gear with teeth 2. On the ends of the teeth 2 and on the parts of the ends of the body 1 adjacent to the ring gear, ring end plates are strengthened: in the region of the tooth heads, reinforced ring rings 3 and 4 with thickness C _{1 are} reinforced, having an outer a diameter equal to the diameter D _{in the} circle of the tops of the teeth and the inner diameter D ₁ ; in the area of the tooth legs, additional (sealing) annular overlays 5 and 6 of thickness C ₂ are strengthened, having an outer diameter equal to D ₁ and an inner diameter D ₂ smaller than the diameter D _{about the} circumference of the tooth bases. The pads located at each of the ends of the wheel are also fastened together by means of annular protrusions 7, which are provided with pads of smaller thickness (5 and 6), these protrusions (7) are perpendicular to the outer ends of these pads. With a large size C _{1, the} protrusions 7 may take the form of a flat ring (fastened to the plane of the corresponding lining - 3 and 4 - facing the center of the wheel); and with a small size C ₁ , the protrusions 7 can take the form of a profile ring having a L-shaped cross section (see drawing). Power plates 3 and 4 are made of a material resistant to the effects of loads (metal), additional plates 5 and 6 can be made of plastic.

When the gear is in gear, the teeth of the 2 wheels experience bending loads that can lead to fracture of the teeth. Power ring pads 3 and 4, mounted on the ends of the teeth 2 of the ring gear, connect the teeth of the 2 wheels to each other, thereby increasing the rigidity of the ring gear and the flexural strength of the teeth. Additional pads 5 and 6, localize the zone of gearing of the teeth of the 2 wheels with the teeth of the twin wheels and prevent the displacement of plastic lubricant on the ends of the wheel.

Compared with the prototype, the proposed gear design is the most optimal. It allows you to save material (metal) going to the manufacture of end plates. In addition, this gear design allows you to install additional (sealing) lining (5 and 6) on the wheels, which were originally made only with power lining (3 and 4). And also to improve the quality of lubrication with plastic lubricants when changing the lubricant - from liquid to plastic.

Claims (1)

A gear wheel, mainly coarse-grained, heavily loaded, lubricated with grease, containing a body, a gear rim with teeth, and a pair of end plates with an outer diameter equal to the diameter of the circumference of the tops of the teeth and an inner diameter smaller than the diameter of the circumference of the bases of the teeth, made of different thicknesses in the radial plane of the gear wheels having a maximum thickness in the region of the tooth heads and a minimum in the region of the tooth legs, in which the thickness change is performed in one step and which are mounted on the ends of the teeth and on the parts of the ends of the body adjacent to the ring gear, characterized in that each end plate is made up of two separate concentric annular rings, different from each other in terms of the above thicknesses, adjacent to each other along the boundary of their change mutual thickness; moreover, the annular plate of smaller thickness along its outer perimeter is also mounted on the inner perimeter of the second annular plate, for which it is equipped with an annular protrusion located perpendicular to its outer end.

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