Fixing structure for reducing deformation of inner gear ring and design method

Abstract

The invention relates to the technical field of gear boxes, in particular to a fixing structure for reducing deformation of an inner gear ring and a design method. The fixing structure comprises an inner gear ring and a fixing piece. The outer ring side of the inner gear ring is provided with a plurality of tooth grooves which are evenly distributed. A mounting groove used for mounting the inner gear ring is formed in the fixing piece, and a plurality of limiting teeth matched with the tooth grooves in a one-to-one correspondence mode are arranged in the mounting groove. In the working process, the planet wheel is meshed with the inner side of the inner gear ring, and the planet wheel generates acting force in the meshing direction of the planet wheel on the inner gear ring, so that the inner gear ring has the tendency of deforming in the acting force direction. Due to the fact that the tooth grooves are formed in the outer ring side of the gear ring, the limiting teeth corresponding to the tooth grooves are arranged on the fixing piece, the limiting teeth generate counter-acting force on the inner gear ring through the tooth grooves, part of acting force borne by the inner gear ring and applied by the planet gear is counteracted through the counter-acting force, and therefore deformation generated in the working process of the inner gear ring is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gear boxes, and in particular to a fixing structure and a design method for reducing deformation of an inner gear ring. Background Art

[0002] At present, the wind power industry is developing rapidly, and high-power-density compact wind power gearbox units have become the mainstream design in the industry.

[0003] The gearbox for wind power is mainly a planetary transmission structure. When the gearbox is running, meshing force will be generated between the gears. Due to the large size of the ring gear and the high flexibility of the structure, the ring gear will produce "petal-like" deformation when the planetary gear meshes. The connection between the inner ring gear and the box body is generally a combination of bolts and pins. Although the pins can offset some of the shear force generated by the meshing of the gears, the ring gear will still produce a large deformation, which will affect the service life of the ring gear. Summary of the invention

[0004] In view of the above-mentioned defects, the technical problem to be solved by the present invention is to provide a fixing structure and a design method for reducing the deformation of the inner gear ring. The fixing structure can reduce the deformation of the gear ring and increase the service life of the gear ring.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a fixing structure for reducing deformation of an inner gear ring, comprising an inner gear ring and a fixing member;

[0007] The outer ring side of the inner gear ring is provided with a plurality of tooth grooves evenly distributed;

[0008] The fixing member is provided with a mounting groove for mounting the inner gear ring, and the mounting groove is provided with a plurality of limiting teeth which match the gear grooves one by one.

[0009] By adopting the above solution, during the working process, the planetary gear meshes with the inner side of the inner gear ring, and the planetary gear generates a force on the inner gear ring along the meshing direction thereof, so that the inner gear ring has a tendency to deform along the force direction. Since the outer ring side of the gear ring is provided with a tooth groove, the fixing member is provided with a limiting tooth corresponding to the tooth groove, and the limiting tooth generates a reaction force on the inner gear ring through the tooth groove, and the deformation of the inner gear ring is limited by the limiting tooth, thereby effectively reducing the deformation of the inner gear ring during the working process.

[0010] The present invention is further configured such that the tooth groove includes two side walls and a bottom wall, the side walls are provided with a plurality of limiting grooves, and the tooth surface of the limiting tooth is provided with a plurality of protrusions that match the limiting grooves on the corresponding side one by one. Since the protrusions on the tooth surface of the limiting tooth are inserted into the corresponding limiting grooves, all the protrusions interact with the corresponding limiting grooves to increase the contact area, so that the limiting tooth can provide a uniformly distributed reaction force for the side walls of the limiting groove, further reducing the deformation of the inner gear ring.

[0011] The present invention is further configured such that there is a gap between the limiting tooth and the corresponding tooth groove. Since there is a gap between the limiting tooth and the corresponding tooth groove, when the inner gear ring is subjected to the force of the planetary gear, the position of the action point between the limiting tooth and the corresponding tooth groove changes, so that the deformation of the gear ring along the tangential direction is further reduced.

[0012] The present invention is further configured such that the limiting groove is an arc-shaped groove. Since the cross section of the limiting groove is an arc-shaped groove, that is, the limiting groove is an arc-shaped groove, a larger contact area can be provided between the limiting groove and the corresponding protrusion, thereby improving the uniformity of load distribution.

[0013] The present invention is further configured such that the part between two adjacent limiting grooves is raised to form an arc-shaped convex surface, and the part of the tooth surface of the limiting tooth located between the two protruding parts is a concave surface matching the convex surface. The convex surface and the concave surface cooperate to increase the contact area, thereby further ensuring uniform load distribution.

[0014] The present invention is further configured such that the convex surface is smoothly connected to the adjacent limiting groove.

[0015] The present invention is further configured to further include a fixing ring, the fixing member is fixedly connected to the fixing ring by bolts, and the fixing member and the fixing ring clamp the inner gear ring together. The inner gear ring is fixed to the fixing member by the fixing ring and the bolts, further limiting the deformation of the inner gear ring.

[0016] On the other hand, the present invention also provides a design method of a fixing structure for reducing deformation of an inner gear ring, comprising the following steps:

[0017] S1: constructing a model of the inner gear ring, a fixing member and a planetary gear meshing with the inner gear ring, obtaining a meshing line distribution of a pair of meshing teeth of the inner gear ring and the planetary gear within a meshing range, and determining a meshing entry line and a meshing exit line;

[0018] S2: Take the intersection of the planetary gear's pitch circle and the tooth surface on the gear meshing side as point C, draw a circle D with point C as the center, and the intersection of the meshing line passing through point C and the outer circle of the inner gear ring as point H, and circle D passes through point H;

[0019] S3: Each meshing line intersects with circle D. A circle D1 is constructed with the arc length center of the circle D intercepted by two adjacent meshing lines as the center. The diameter of circle D1 is equal to the distance between the intersection points of the two adjacent meshing lines and circle D.

[0020] S4: draw an arc segment L with point C as the arc center, the arc segment L coincides with a portion of each circle D1, and the first end of the arc segment L is located on the meshing line;

[0021] S5: The arc segment L as a whole is translated along the meshing line through the first end until the first end is located on the outer circle of the inner gear ring, thereby obtaining the arc segment La;

[0022] S6: With the line connecting point H and the center of the inner gear ring as the mirror line, the arc segment La is mirrored to obtain the arc segment Lb, the first ends of La and Lb are both located on the outer circle of the inner gear ring, the second ends of La and Lb are connected by the line segment Lc, and the tooth groove is formed by cutting along the axial direction of the inner gear ring with La, Lb and Lc as the contour lines.

[0023] By adopting the above scheme, since the force along the meshing line direction applied to the teeth of the inner gear ring can be transmitted to the limiting teeth through the tooth grooves, the reaction force of the tooth grooves of the limiting teeth mainly reacts to the tooth grooves along the meshing line direction, thereby achieving the effect of reducing the deformation of the inner gear ring.

[0024] The present invention is further configured such that the arc line segment La in step S4 includes concave arc segments corresponding one to one with the circle D1, the concave arc segments overlap on the corresponding circle D1, and the two concave arc segments are connected by a connecting segment. The concave arc segments can form a limiting groove on the side wall of the tooth groove when the inner gear ring is cut along the axial direction of the inner gear ring with La and Lb as the contour in step S6.

[0025] The present invention is further configured such that there is a gap between the limiting tooth and the corresponding tooth groove, and the average roundness deformation of the inner gear ring and the average roundness deformation of the fixing part during the meshing process between the inner gear ring and the planetary gear are obtained, and the difference between the average roundness deformation of the inner gear ring and the fixing part is used as the gap between the limiting tooth and the corresponding tooth groove.

[0026] In summary, the fixing structure and design method for reducing deformation of the inner gear ring provided by the present invention have at least the following beneficial effects:

[0027] 1. The limiting teeth generate a reaction force on the inner gear ring through the tooth grooves, and the reaction force balances the force applied by the planetary gear to the inner gear ring, thereby reducing the deformation of the inner gear ring during operation.

[0028] 2. The service life of the inner gear ring is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without expending any novel work.

[0030] Figure 1 is a schematic diagram of the structure of the fixing structure in the present invention (in which the fixing ring is hidden);

[0031] Figure 2 It is a structural schematic diagram of a fixing member in the fixing structure of the present invention;

[0032] Figure 3 yes Figure 2 A-1 in the middle is an enlarged view;

[0033] Figure 4 It is a schematic diagram of the structure of the inner gear ring and the planetary gear in the present invention;

[0034] Figure 5 yes Figure 4 A-2 in the middle is an enlarged view;

[0035] Figure 6 It is a schematic diagram of the structure in which the inner gear ring, the fixing member and the fixing ring are fixedly connected by bolts in the present invention;

[0036] Figure 7 It is a schematic diagram of the structure of the inner gear ring and the planetary gear in the present invention;

[0037] Figure 8 yes Figure 7 A-3 in the middle is an enlarged view;

[0038] Fig. 9 is a schematic diagram of the roundness deformation of the inner gear ring in the present invention;

[0039] Fig.10 It is a structural schematic diagram of the fixing member in the present invention.

[0040] The reference numerals include: inner gear ring 1, fixing part 2, tooth groove 3, mounting groove 4, limiting tooth 5, side wall 6, bottom wall 7, limiting groove 8, protrusion 9, convex surface 10, concave surface 11, fixing ring 12, bolt 13, meshing line 14, meshing entry line 15, meshing exit line 16, planetary gear 17. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, Figure 1-10 The present invention is further described in detail with specific implementation modes.

[0042] See also Figure 1-10 , this embodiment provides a fixing structure for reducing the deformation of the inner gear ring, and the fixing structure includes a fixing member 2 and an inner gear ring 1. Among them, a plurality of evenly distributed tooth grooves 3 are provided on the outer ring side of the inner gear ring 1, and the tooth grooves 3 are evenly distributed along the circumferential direction, and the tooth grooves 3 pass through the inner gear ring 1 along the axial direction. A mounting groove 4 for mounting the inner gear ring 1 is provided on the fixing member 2, and a plurality of limiting teeth 5 that match the tooth grooves 3 one by one are provided in the mounting groove 4. The limiting teeth 5 are inserted into the corresponding tooth grooves 3. Among them, the fixing member 2 can be a housing of a gear box, or it can be a fixing seat connected to the housing of the gear box and used to mount the inner gear ring 1.

[0043] By adopting the above scheme, during assembly, the inner gear ring 1 is inserted into the installation groove 4 along the axial direction, and the limiting teeth 5 are inserted into the corresponding tooth grooves 3 along the axial direction. During operation, the planetary gear 17 meshes with the inner side of the inner gear ring 1, and the planetary gear 17 generates a force on the inner gear ring 1 along the direction of its meshing line 14, so that the inner gear ring 1 has a tendency to deform along the direction of the force. Since the outer ring side of the gear ring is provided with tooth grooves 3, the fixing member 2 is provided with limiting teeth 5 corresponding to the tooth grooves 3, and the limiting teeth 5 generate a reaction force on the inner gear ring 1 through the tooth grooves 3, and the reaction force offsets the part of the force applied by the planetary gear 17 to the inner gear ring 1, thereby reducing the deformation of the inner gear ring 1 during operation.

[0044] Specifically, the tooth groove 3 includes two side walls 6 and a bottom wall 7, and the side walls 6 are provided with a plurality of limiting grooves 8, and the limiting grooves 8 axially penetrate the inner gear ring 1. The tooth surface of the limiting tooth 5 is provided with a plurality of protrusions 9 that match the limiting grooves 8 on the corresponding side one by one, and the protrusions 9 are inserted into the corresponding limiting grooves 8.

[0045] In this embodiment, the limiting groove 8 is preferably an arc-shaped groove, the cross section of the limiting groove 8 is an arc-shaped, and the end surface of the protrusion 9 is an arc-shaped shape that matches the shape of the limiting groove 8. Since the cross section of the limiting groove 8 is an arc-shaped, that is, the limiting groove 8 is an arc-shaped groove, a larger contact area can be provided between the limiting groove 8 and the corresponding protrusion 9, thereby improving the uniformity of load distribution.

[0046] The part between two adjacent limiting grooves 8 on the inner gear ring 1 is raised to form an arcuate convex surface 10, and the part of the tooth surface of the limiting tooth 5 between the two protrusions 9 is an arcuate concave surface 11 matching the convex surface 10. The convex surface 10 is smoothly connected to the adjacent limiting grooves 8.

[0047] In order to further limit the deformation of the inner gear ring 1, preferably, there is a gap between the limiting tooth 5 and the corresponding tooth groove 3. Correspondingly, there is a gap between the protrusion 9 and the corresponding limiting groove 8. When the inner gear ring 1 is subjected to the force of the planetary gear 17, the position of the action point between the limiting tooth 5 and the corresponding tooth groove 3 changes, and correspondingly, the position of the action point between the protrusion 9 and the corresponding limiting groove 8 changes, so that the deformation of the inner gear ring 1 along the tangential direction is further reduced.

[0048] In order to enhance the stability of the connection between the inner gear ring 1 and the fixing member 2, a fixing ring 12 is further included. The fixing member 2 is fixedly connected to the fixing ring 12 by bolts 13. The bolts 13 penetrate the inner gear ring 1 along the axial direction of the inner gear ring 1. The fixing member 2 and the fixing ring 12 clamp the inner gear ring 1 together. During assembly, the inner gear ring 1 is first axially installed into the installation groove 4, and the bolts 13 pass through the through holes on the inner gear ring 1 and are threadedly connected to the threaded holes on the fixing ring 12.

[0049] On the other hand, based on the same inventive concept, the present invention also provides a design method for a fixing structure for reducing deformation of an inner gear ring, comprising the following steps:

[0050] S1: constructing a model of the inner gear ring 1, the fixing member 2 and the planetary gear 17 meshing with the inner gear ring 1, obtaining the distribution of the meshing line 14 of one pair of meshing teeth of the inner gear ring 1 and the planetary gear 17 within the meshing range, and determining the meshing line 15 and the meshing out line 16;

[0051] S2: The intersection of the pitch circle of the planetary gear 17 and the tooth surface on the meshing side of the gear teeth is point C, and a circle D is drawn with point C as the center. The intersection of the meshing line 14 passing through point C and the outer circle of the inner gear ring 1 is point H, and the circle D passes through point H;

[0052] S3: Each meshing line 14 intersects with the circle D, and a circle D1 is drawn with the arc length center of the circle D intercepted by two adjacent meshing lines 14 as the center, and the diameter of the circle D1 is equal to the distance between the intersection points of the two adjacent meshing lines 14 and the circle D;

[0053] S4: draw an arc segment L with point C as the arc center, the arc segment L coincides with a portion of each circle D1, and the first end of the arc segment L is located on the meshing line 16;

[0054] S5: The arc segment L as a whole is translated along the meshing line 16 in step S1 through the first end until the first end is located on the outer circle of the inner gear ring 1, thereby obtaining the arc segment La; in order to avoid an acute angle being formed at the intersection of the inner gear ring 1 and the outer circle, the intersection of the arc segment La and the outer circle of the inner gear ring 1 is chamfered.

[0055] S6: With the line connecting point H and the center O of the inner gear ring 1 as the mirror line, the arc segment La is mirrored to obtain the arc segment Lb. The first ends of La and Lb are both located on the outer circle of the inner gear ring 1. The second ends of La and Lb are connected by the line segment Lc. With La, Lb and Lc as the contour lines, a tooth groove 3 is cut along the axial direction of the inner gear ring 1. The remaining tooth grooves 3 are designed and formed by the above method. In order to meet the structural strength, there is a certain spacing between adjacent tooth grooves 3. Among them, the spacing Li between Lc and the tooth root of the inner gear ring 1 should meet the design requirements to avoid affecting the working performance of the tooth part of the internal gear. Among them, La and Lb form the two side walls 6 of the tooth groove 3, and Lc forms the bottom wall 7 of the tooth groove 3.

[0056] By adopting the above scheme, since the force along the meshing line 14 exerted on the teeth of the inner ring gear 1 can be transmitted to the limiting tooth 5 through the tooth groove 3, the reaction force of the limiting tooth 5 on the tooth groove 3 mainly reacts to the tooth groove 3 along the direction of the meshing line 14, thereby achieving the effect of reducing the deformation of the inner ring gear 1.

[0057] The arc segment L in step S4 includes concave arc segments corresponding to the circle D1 one by one, the concave arc segments overlap on the corresponding circle D1, and the two concave arc segments are connected by a connecting segment. The concave arc segments can form a limiting groove 8 on the side wall 6 of the tooth groove 3 when the inner gear ring 1 is cut along the axial direction of the inner gear ring 1 with La and Lb as the contour in step S6. The connecting segment is preferably an arc convex outward, and the connecting segment and the concave arc segment are connected in sequence so that the arc segment La is wavy as a whole.

[0058] In order to reduce the deformation of the inner gear ring 1, there is a gap between the limiting tooth 5 and the corresponding tooth groove 3, and the average roundness deformation of the inner gear ring 1 and the average roundness deformation of the fixing member 2 during the meshing process between the inner gear ring 1 and the planetary gear 17 are obtained. That is, during the operation of the inner gear ring 1, the average roundness deformation of the inner gear ring 1 and the average roundness deformation of the fixing member 2 are caused by the meshing force of the planetary gear 17. For the roundness deformation of the inner gear ring 1, please refer to Fig. 9 Specifically, the difference between the average roundness deformation of the inner gear ring 1 and the fixing member 2 is used as the gap between the limit tooth 5 and the corresponding tooth groove 3. The average roundness deformation can be obtained by finite element analysis or by measuring the fixing member 2 and the inner gear ring 1.

[0059] It should be noted that the words indicating direction in this article, such as up and down, are all based on Figure 1 The setting of the direction is only for the convenience of description and has no other specific meaning.

[0060] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0061] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A fixing structure for reducing deformation of an inner gear ring, characterized in that: It comprises an inner gear ring (1) and a fixing member (2); The outer ring side of the inner gear ring (1) is provided with a plurality of tooth grooves (3) which are evenly distributed; The fixing member (2) is provided with a mounting groove (4) for mounting the inner gear ring (1), and the mounting groove (4) is provided with a plurality of limiting teeth (5) which are matched one-to-one with the tooth grooves (3).

2. A fixing structure for reducing deformation of an inner gear ring as claimed in claim 1, characterized in that: The tooth groove (3) comprises two side walls (6) and a bottom wall (7), the side walls (6) are provided with a plurality of limiting grooves (8), and the tooth surface of the limiting tooth (5) is provided with a plurality of protrusions (9) which match the limiting grooves (8) on the corresponding side in a one-to-one correspondence.

3. A fixing structure for reducing deformation of an inner gear ring as claimed in claim 2, characterized in that: There is a gap between the limiting tooth (5) and the corresponding tooth groove (3).

4. A fixing structure for reducing deformation of an inner gear ring as claimed in claim 2 or 3, characterized in that: The limiting groove (8) is an arc-shaped groove.

5. A fixing structure for reducing deformation of an inner gear ring as claimed in claim 4, characterized in that: The portion between two adjacent limiting grooves (8) is raised to form an arc-shaped convex surface (10), and the portion of the tooth surface of the limiting tooth (5) located between the two protruding portions (9) is a concave surface (11) matching the convex surface (10).

6. A fixing structure for reducing deformation of an inner gear ring as claimed in claim 5, characterized in that: The convex surface (10) is smoothly connected to the adjacent limiting groove (8).

7. A fixing structure for reducing deformation of an inner gear ring as claimed in claim 1, characterized in that: It also comprises a fixing ring (12), the fixing member (2) is fixedly connected to the fixing ring (12) via bolts (13), and the fixing member (2) and the fixing ring (12) together clamp the inner gear ring (1).

8. A method for designing a fixing structure for reducing deformation of an inner gear ring according to any one of claims 1 to 7, characterized in that: The following steps are included: S1: constructing models of the inner gear ring (1), the fixing member (2), and the planetary gear (17) meshing with the inner gear ring (1), obtaining the distribution of the meshing line (14) of a pair of meshing teeth of the inner gear ring (1) and the planetary gear (17) within the meshing range, and determining the meshing line (15) and the meshing out line (16); S2: The intersection of the pitch circle of the planetary gear (17) and the tooth surface on the meshing side of the gear teeth is taken as point C, and a circle D is drawn with point C as the center. The intersection of the meshing line (14) passing through point C and the outer circle of the inner gear ring (1) is taken as point H, and the circle D passes through point H; S3: Each meshing line (14) intersects with the circle D, and a circle D1 is drawn with the arc length center of the circle D intercepted by two adjacent meshing lines (14) as the center, and the diameter of the circle D1 is equal to the distance between the intersection points of the two adjacent meshing lines (14) and the circle D; S4: draw an arc segment L with point C as the arc center, the arc segment L coincides with a portion of each circle D1, and the first end of the arc segment L is located on the meshing line (16); S5: The arc segment L as a whole is translated along the meshing line (16) through the first end until the first end is located on the outer circle of the inner gear ring (1), thereby obtaining an arc segment La; S6: With the line connecting point H and the center of the inner gear ring (1) as the mirror line, the arc segment La is mirrored to obtain the arc segment Lb, the first ends of La and Lb are both located on the outer circle of the inner gear ring (1), the second ends of La and Lb are connected by the line segment Lc, and the tooth groove (3) is formed by cutting along the axial direction of the inner gear ring (1) with La, Lb and Lc as the contour lines.

9. A design method for a fixing structure for reducing deformation of an inner gear ring as claimed in claim 8, characterized in that: The arc segment La in step S4 includes concave arc segments corresponding one to one with the circle D1, the concave arc segments overlap on the corresponding circle D1, and the two concave arc segments are connected by a connecting segment. The concave arc segments can form a limiting groove (8) on the side wall (6) of the tooth groove (3) when the inner gear ring (1) is cut along the axial direction of the inner gear ring (1) with La and Lb as the contour in step S6.

10. A design method for a fixing structure for reducing deformation of an inner gear ring as claimed in claim 8, characterized in that: There is a gap between the limiting tooth (5) and the corresponding tooth groove (3), and the average circular deformation of the inner gear ring (1) and the average circular deformation of the fixing member (2) during the meshing process between the inner gear ring (1) and the planetary gear (17) are obtained, and the difference between the average circular deformation of the inner gear ring (1) and the fixing member (2) is used as the gap between the limiting tooth (5) and the corresponding tooth groove (3).

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