A symmetrical tangent three-arc full-section martensitic structure layer groove variable pitch bearing

Abstract

The present invention discloses a symmetrical tangent three-arc full-section martensitic tissue layer groove variable pitch bearing, comprising a bearing inner ring, a symmetrical tangent three-arc full-section martensitic tissue layer groove, a steel ball, a bearing outer ring, a retaining frame and a sealing ring; the symmetrical tangent three-arc full-section martensitic tissue layer groove of the bearing is in the shape of three sections of symmetrical tangent arcs, and the full section of the symmetrical tangent three-arc groove is a uniform martensitic tissue layer after material modification. A symmetrical tangent three-arc full-section martensitic tissue layer groove is provided on the inner diameter of the bearing outer ring, and a symmetrical tangent three-arc full-section martensitic tissue layer groove is provided on the outer diameter of the bearing inner ring. The present invention has the advantages of significantly improving the structural strength of the bearing ring, improving the fracture resistance of the bearing ring, and eliminating the phenomenon of the bearing ring being fractured.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine pitch bearings, in particular to a symmetrical tangent three-arc full-section martensitic structure layer groove pitch bearing. Background Art

[0002] The wind turbine variable pitch bearing with symmetrical tangent three-arc full-section quenching groove refers to: the wind turbine generator set includes a wind rotor and a generator; the wind rotor contains blades, a hub, reinforcements, etc.; it has the functions of blades rotating under wind power to generate electricity and the generator head rotating. The wind power source consists of a wind turbine generator set, a tower supporting the generator set, a battery charging controller, an inverter, an unloader, a grid-connected controller, a battery pack, etc. The variable pitch bearing is a special bearing for wind turbine bearings, which has a harsh operating environment, high maintenance costs, and requires a long life.

[0003] The existing wind turbine bearing grooves are two traditional symmetrical arc grooves, and the groove-shaped oil grooves are used to separate the two grooves at the intersection of the two arcs. This structure will cause the quenching layer of the groove to form two independent and unconnected quenching layers. The quenching layer has no help and support for the structural strength of the bearing. At the same time, the part where the groove-shaped oil grooves separate the two grooves provides structural conditions for the occurrence of stress concentration. Summary of the invention

[0004] The object of the present invention is to provide a symmetrical tangent three-arc full-section martensitic structure layer groove variable pitch bearing to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a symmetrical tangent three-arc full-section martensitic structure layer groove variable pitch bearing, comprising a wind turbine variable pitch bearing, a bearing inner ring, a steel ball, a symmetrical tangent three-arc full-section martensitic structure layer groove, a bearing outer ring, a sealing ring, and a retaining frame; the symmetrical tangent three-arc full-section martensitic structure layer groove of the bearing is in the shape of three sections of symmetrical tangent arcs, and the full section of the symmetrical tangent three-arc groove is treated by material modification to be a uniform martensitic structure layer;

[0006] The inner diameter of the bearing outer ring is provided with symmetrical tangent three-arc full-section martensitic structure layer grooves, and the outer diameter of the bearing inner ring is provided with symmetrical tangent three-arc full-section martensitic structure layer grooves;

[0007] The outer diameter groove surface of the inner ring of the bearing with symmetrical tangent three-arc full-section martensitic tissue layer grooves is installed with steel balls, a retainer and a bearing outer ring with symmetrical tangent three-arc full-section martensitic tissue layer grooves; the outer ring groove of the bearing with symmetrical tangent three-arc full-section martensitic tissue layer grooves and the inner ring groove of the bearing with symmetrical tangent three-arc full-section martensitic tissue layer grooves are matched in size to form an annular ball track, so that the steel balls and the retainer rotate around in the annular ball track formed by the outer ring groove of the bearing with symmetrical tangent three-arc full-section martensitic tissue layer grooves and the inner ring groove of the bearing with symmetrical tangent three-arc full-section martensitic tissue layer grooves;

[0008] The outer ring groove of the bearing and the inner ring groove of the bearing with double rows of symmetrically tangent three-arc full-section martensitic structure layer grooves form two rows of annular ballways, and the steel balls and retainers are distributed in annular shapes in the annular ballways;

[0009] The end face of the bearing inner ring of the bearing with symmetrically tangent three-arc full-section martensitic structure layer grooves is equipped with a sealing ring, and the size of the sealing ring is adapted to the size of the end face sealing groove of the bearing inner ring with symmetrically tangent three-arc full-section martensitic structure layer grooves and is in close contact with the inner diameter sealing groove of the bearing outer ring with symmetrically tangent three-arc full-section martensitic structure layer grooves;

[0010] The end face of the bearing outer ring of the bearing with symmetrically tangent three-arc full-section martensitic structure layer grooves is equipped with a sealing ring, and the size of the sealing ring is adapted to the size of the end face sealing groove of the bearing outer ring with symmetrically tangent three-arc full-section martensitic structure layer grooves and is in close contact with the outer diameter sealing groove of the bearing inner ring with symmetrically tangent three-arc full-section martensitic structure layer grooves;

[0011] The annular ball track formed by the bearing outer ring groove with symmetrical tangent three-arc full-section martensitic structure layer grooves and the bearing inner ring groove with symmetrical tangent three-arc full-section martensitic structure layer grooves is filled with grease.

[0012] Preferably, the outer ring groove of the bearing with symmetrical tangent three-arc full-section martensitic structure layer grooves and the inner ring groove of the bearing with symmetrical tangent three-arc full-section martensitic structure layer grooves are matched in size to form an annular ball track, so that the steel ball and the retaining frame rotate along the annular ball track formed by the outer ring groove of the bearing with symmetrical tangent three-arc full-section martensitic structure layer grooves and the inner ring groove of the bearing with symmetrical tangent three-arc full-section martensitic structure layer grooves.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention replaces the symmetrical two-arc groove with a symmetrical tangent three-arc full-section martensitic structure layer groove at the groove position of the bearing ring, and cancels the groove-shaped oil groove that separates the symmetrical two-arc groove from the symmetrical groove. This structure makes the quenching layer of the entire groove form an integral groove quenching layer, strengthens the structural strength of the bearing ring, and at the same time, because the groove-shaped oil groove is cancelled, the structural condition for generating stress concentration phenomenon at the position where the groove-shaped oil groove separates the two grooves is eliminated, and the structural strength of the bearing ring is further improved. This structure can significantly improve the structural strength of the bearing ring, improve the anti-fracture ability of the bearing ring, and basically eliminate the phenomenon of bearing ring fracture. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0016] Figure 2 It is a side structural schematic diagram of the present invention.

[0017] In the figure: 1. Inner ring of bearing; 2. Steel ball; 3. Full cross-section martensitic groove of three symmetrically tangent arcs; 4. Outer ring of bearing; 5. Sealing ring; 6. Cage; DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] See also Figure 1 to Figure 2 , an embodiment provided by the present invention: the present invention provides the following technical solutions: a symmetrical tangent three-arc full-section martensitic structure layer groove variable pitch bearing, comprising a wind turbine variable pitch bearing, a bearing inner ring 1, a steel ball 2, a symmetrical tangent three-arc full-section martensitic structure layer groove 3, a bearing outer ring 4, a sealing ring 5, and a retaining frame 6; the symmetrical tangent three-arc full-section martensitic structure layer groove 3 of the bearing is in the shape of three sections of symmetrical tangent arcs, and the full section of the symmetrical tangent three-arc groove is modified into a uniform martensitic structure layer. A symmetrical tangent three-arc full-section martensitic structure layer groove 3 is provided on the inner diameter of the bearing outer ring 4, and a symmetrical tangent three-arc full-section martensitic structure layer groove 3 is provided on the outer diameter of the bearing inner ring 1.

[0022] The outer diameter groove surface of the bearing inner ring 1 of the bearing with symmetrical tangent three-arc full-section martensitic structure layer grooves 3 is installed with steel balls 2, a retaining frame 6 and a bearing outer ring 4 with symmetrical tangent three-arc full-section martensitic structure layer grooves 3; the grooves of the bearing outer ring 4 with symmetrical tangent three-arc full-section martensitic structure layer grooves 3 and the grooves of the bearing inner ring 1 with symmetrical tangent three-arc full-section martensitic structure layer grooves 3 are adapted to each other in size to form an annular ball track, so that the steel balls 2 and the retaining frame 6 rotate around along the annular ball track formed by the grooves of the bearing outer ring 4 with symmetrical tangent three-arc full-section martensitic structure layer grooves 3 and the grooves of the bearing inner ring 1 with symmetrical tangent three-arc full-section martensitic structure layer grooves 3.

[0023] The bearing has a double row of bearing outer ring 4 grooves with symmetrical tangent three-arc full-section martensitic structure layer grooves 3 and a bearing inner ring 1 groove with double row of symmetrical tangent three-arc full-section martensitic structure layer grooves 3 to form two rows of annular ball tracks, and the steel balls 2 and retaining frames 6 are distributed in annular form in the annular ball tracks; the end face of the bearing inner ring 1 with symmetrical tangent three-arc full-section martensitic structure layer grooves is installed with a sealing ring 5, and the size of the sealing ring 5 is adapted to the size of the end face sealing groove of the bearing inner ring 1 with symmetrical tangent three-arc full-section martensitic structure layer grooves 3 and is in close contact with the inner diameter sealing groove of the bearing outer ring 4 with symmetrical tangent three-arc full-section martensitic structure layer grooves.

[0024] A sealing ring 5 is installed on the end face of the bearing outer ring 4 of the bearing with symmetrically tangent three-arc full-section martensitic structure layer groove 3, and the size of the sealing ring 5 is adapted to the size of the end face sealing groove of the bearing outer ring 4 of the bearing with symmetrically tangent three-arc full-section martensitic structure layer groove 3 and is in close contact with the outer diameter sealing groove of the bearing inner ring with symmetrically tangent three-arc full-section martensitic structure layer groove 3; the annular ball track formed by the bearing outer ring groove with symmetrically tangent three-arc full-section martensitic structure layer groove 3 and the bearing inner ring 1 groove with symmetrically tangent three-arc full-section martensitic structure layer groove 3 is filled with grease.

[0025] A symmetrical tangent three-arc full-section martensitic structure layer groove 3 is formed at the groove position of the bearing ring to replace the symmetrical two-arc groove, and the groove-shaped oil groove that divides the symmetrical two-arc groove is eliminated. This structure enables the quenching layer of the entire groove to form an integral groove quenching layer, thereby strengthening the structural strength of the bearing ring. At the same time, since the groove-shaped oil groove is eliminated, the structural condition for generating stress concentration phenomenon at the position where the groove-shaped oil groove divides the two grooves is eliminated, thereby further improving the structural strength of the bearing ring.

[0026] This structure makes the quenching layer of the entire channel form an integral channel quenching layer, strengthens the structural strength of the bearing ring, and at the same time, because the groove-shaped oil groove is eliminated, the structural condition that produces stress concentration phenomenon at the part where the groove-shaped oil groove separates the two channels is eliminated, and further improves the structural strength of the bearing ring. This structure can significantly improve the structural strength of the bearing ring, improve the anti-fracture ability of the bearing ring, and basically eliminate the phenomenon of bearing ring fracture.

[0027] Working principle: By making a symmetrical tangent three-arc full-section martensitic structure layer channel at the position of the bearing ring channel to replace the symmetrical two-arc channel, the groove-shaped oil channel that separates the two channels is eliminated. This structure makes the quenching layer of the entire channel form an integral channel quenching layer, strengthening the structural strength of the bearing ring. At the same time, since the groove-shaped oil channel is eliminated, the structural condition for the stress concentration phenomenon at the position where the groove-shaped oil channel separates the two channels is eliminated, and the structural strength of the bearing ring is further improved. This structure can significantly improve the structural strength of the bearing ring, improve the anti-fracture ability of the bearing ring, and basically eliminate the phenomenon of bearing ring fracture.

[0028] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A symmetrical tangent three-arc full-section martensitic structure layer groove variable pitch bearing, comprising a wind turbine variable pitch bearing, a bearing inner ring (1), a steel ball (2), a symmetrical tangent three-arc full-section martensitic structure layer groove (3), a bearing outer ring (4), a sealing ring (5) and a retaining frame (6), characterized in that: The shape of the symmetrical tangent three-arc full-section martensitic structure layer channel (3) of the wind turbine variable pitch bearing is three sections of symmetrical tangent arcs, and the full section of the symmetrical tangent three-arc full-section martensitic structure layer channel (3) is processed by material modification to form a uniform martensitic structure layer; A symmetrical tangent three-arc full-section martensitic structure layer groove (3) is provided on the inner diameter of the bearing outer ring (4); a symmetrical tangent three-arc full-section martensitic structure layer groove (3) is provided on the outer diameter of the bearing inner ring (1); The outer diameter groove surface of the bearing inner ring (1) is provided with a steel ball (2), a retainer (6) and a bearing outer ring (4) with a symmetrical tangent three-arc full-section martensitic structure layer groove (3), and the groove of the bearing outer ring (4) with a symmetrical tangent three-arc full-section martensitic structure layer groove (3) and the groove of the bearing inner ring (1) with a symmetrical tangent three-arc full-section martensitic structure layer groove (3) are matched in size, so that the steel ball (2) and the retainer (6) are rotated in an annular ball track formed by the groove of the bearing outer ring (4) with a symmetrical tangent three-arc full-section martensitic structure layer groove (3) and the groove of the bearing inner ring (1) with a symmetrical tangent three-arc full-section martensitic structure layer groove (3); The wind turbine variable pitch bearing comprises two rows of annular ball tracks formed by a double row of grooves on the outer ring (4) of the bearing with symmetrically tangent three-arc full-section martensitic structure layer grooves (3) and a double row of grooves on the inner ring (1) of the bearing with symmetrically tangent three-arc full-section martensitic structure layer grooves (3). The bearing inner ring (1) with the symmetrically tangent three-arc full-section martensitic structure layer groove (3) is provided with a sealing ring (5) installed on the end face thereof, and the size of the sealing ring (5) is adapted to the size of the end face sealing groove of the bearing inner ring (1) with the symmetrically tangent three-arc full-section martensitic structure layer groove (3) and is in close contact with the inner diameter sealing groove of the bearing outer ring (4) with the symmetrically tangent three-arc full-section martensitic structure layer groove (3); The end face of the bearing outer ring (4) of the bearing with the symmetrically tangent three-arc full-section martensitic structure layer groove (3) is equipped with a sealing ring (5), and the size of the sealing ring (5) is adapted to the size of the end face sealing groove of the bearing outer ring (4) of the bearing with the symmetrically tangent three-arc full-section martensitic structure layer groove (3) and is in close contact with the outer diameter sealing groove of the bearing inner ring (1) with the symmetrically tangent three-arc full-section martensitic structure layer groove (3).

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