JP5002244B2 - Flange structure to which a member that transmits rotational driving force is fixed - Google Patents

Description

  The present invention relates to a flange structure to which a member for transmitting a rotational driving force is fixed, and more particularly to a flange structure in a flange portion such as a power transmission device to which a ring gear is assembled.

Patent Document 1 describes a differential case used for a differential limiting device. In the differential case, a ring gear that meshes with a drive pinion for transmitting a driving force is fixed to a mounting boss portion of the flange portion with a bolt. In this flange portion, the differential case is lightened by thinning the outer diameter side between two mounting bosses adjacent in the circumferential direction.
Japanese Patent Laid-Open No. 62-20722

  By the way, in the flange portion to which the ring gear is fixed, a rotation load is applied to the ring gear fixing portion of the flange portion by the rotation of the ring gear. However, in the flange portion of the differential case as described above, the outer diameter side between two mounting bosses adjacent to each other in the circumferential direction is thinned in order to reduce the weight of the differential case. There were few parts to receive, and the rigidity of the flange part was reduced.

  Accordingly, an object of the present invention is to provide a flange structure to which a member that transmits a rotational driving force that can be reduced in weight while securing rigidity is fixed.

According to a first aspect of the present invention, a flange portion provided on the rotating member, an annular wall portion provided so that the flange portion is located on the inner peripheral side, and an outer peripheral side of the annular wall portion are formed continuously. And projecting toward the outer diameter side, and a plurality of convex wall portions formed at intervals in the circumferential direction, straddling the annular wall portion and each of the plurality of convex wall portions formed. A flange structure having a plurality of holes formed in the axial direction and fixed to a member for transmitting a rotational driving force, wherein the annular wall portion has an outer diameter side from an axial center side of the rotating member. And a rib provided between two holes adjacent to each other in the circumferential direction among the plurality of holes formed in the circumferential direction. The rib includes a first rib and a second rib. consists of a rib, the second rib is formed to protrude on a surface of the first rib, the axis of said rotary member From the axial center of the rotating member to the center of the hole, and the axial wall thickness of the convex wall is determined by the annular wall. The radius from the axial center of the rotating member to the outer peripheral end of the rib is set to be greater than the radius from the axial center of the rotating member to the hole position. It is characterized by that.

Invention of Claim 2 is a flange structure to which the member which transmits the rotational drive force of Claim 1 is fixed, Comprising: The said cyclic | annular wall part is a 1st cyclic | annular wall part located in an inner diameter side, and an outer diameter. And a second annular wall portion provided with the ribs on the side, and the axial thickness of the second annular wall portion is set to be smaller than the axial thickness of the first annular wall portion. It is characterized by being.

The invention according to claim 3 is a flange structure to which the member for transmitting the rotational driving force according to claim 1 or 2 is fixed, and the wall surface of the convex wall portion is formed around the plurality of formed holes. A concave wall surface is formed continuously toward the annular wall portion .

According to a fourth aspect of the present invention, there is provided a flange structure to which the member for transmitting the rotational driving force according to the third aspect is fixed, wherein the rib is formed between the two concave wall surfaces adjacent in the circumferential direction. It is characterized by that.

The invention of claim 5 is a flange structure to which the member for transmitting the rotational driving force according to any one of claims 1 to 4 is fixed, and the rotating member includes two cylindrical members and these Each of the cylindrical members has a flange portion, and each flange portion includes the annular wall portion, the convex wall portion, and the hole portion, and at least one of the flange portions is the rib. characterized in that it comprises a.

The flange structure to which the member for transmitting the rotational driving force according to claim 1 is fixed is effective in reducing the mass around the convex wall portion where the hole portion is formed on the outer diameter side of the flange portion of the rotating member. In addition to reducing the weight, the rigidity of the flange portion can be ensured by providing the rib. Moreover, since the rib is formed by combining the first rib and the second rib, the deformation of the flange portion can be effectively prevented. In addition, by reinforcing the center position of the hole, which is the thinnest in the circumferential direction, at the outer peripheral side end of the annular wall, rigidity is effectively ensured even if rotational drive force is input to or output from the convex wall. can do. Moreover, since the axial thickness of the convex wall portion is set to be thinner than the axial thickness of the annular wall portion, it is possible to more effectively secure the rigidity and reduce the weight of the flange portion. Further, by reinforcing the position of the hole portion that is the thinnest in the circumferential direction with a rib, rigidity can be effectively ensured even if the rotational driving force is input to or output from the convex wall portion.

The flange structure to which the member for transmitting the rotational driving force according to claim 2 is fixed is effective in reducing the mass around the convex wall portion where the hole portion is formed on the outer diameter side of the flange portion of the rotating member. In addition to reducing the weight, the rigidity of the flange portion can be ensured by providing the rib. Further, by providing the first and second annular wall portions having different thicknesses, it is possible to more effectively secure the rigidity and reduce the weight of the flange portion.

In the flange structure to which the member for transmitting the rotational driving force of claim 3 is fixed, the annular wall portion can be reduced in weight by the concave wall surface. Moreover, since the concave wall surface is formed toward the annular wall portion continuously with the wall surface of the convex wall portion, the rib can be formed simultaneously with the formation of the concave wall surface.

In the flange structure to which the member for transmitting the rotational driving force of claim 4 is fixed, the rib is formed between two concave wall surfaces adjacent to each other in the circumferential direction, so that the rib is formed simultaneously with the formation of the concave wall surface. Can do.

In the flange structure to which the member that transmits the rotational driving force of claim 5 is fixed, each flange portion includes an annular wall portion, a convex wall portion, and a hole portion, even if the rotation member is a divided structure. When any one of the flange portions is provided with a rib, it is possible to ensure optimal weight reduction and rigidity.

  The embodiment will be described with reference to FIGS. In the present embodiment, a description will be given of the flange structure of the flange portion 1 to which a ring gear (a member that transmits rotational driving force) that meshes with a drive pinion for transmitting driving force is fixed.

  The flange structure of the present embodiment is provided on the cover 3 (rotating member) and is located on the flange portion 1 having the first wall portion 5 and the second wall portion 7 and on the inner peripheral side of the flange portion 1. An annular wall portion 9 provided on the outer peripheral side of the first wall portion 5 and a plurality of convex wall portions that protrude toward the outer diameter side and are spaced apart in the circumferential direction. 11 and a plurality of hole portions 13 formed in the axial direction across the annular wall portion 9 and each of the plurality of convex wall portions 11 formed. The annular wall portion 9 has two hole portions 13 and 13 adjacent to each other in the circumferential direction among the plurality of hole portions 13 formed in the circumferential direction from the axial center side of the cover 3 toward the outer diameter side. The rib 15 provided between the two is provided.

  As shown in FIGS. 1-3, the differential case 101 is comprised from the case main body 103 and the cover 3 (two cylindrical members) as a rotation member. The case main body 103 includes an accommodating portion 105, a boss portion 107, and a flange portion 109. The accommodating portion 105 accommodates a differential mechanism 119 including a pinion shaft 111, a pinion gear 113, side gears 115 and 117, and a differential limiting mechanism 123 including a multi-plate clutch 121 that limits the differential of the differential mechanism 119. . The outer peripheral side of the boss portion 107 is supported by a differential carrier (not shown) via a bearing (not shown). An axle (not shown) is inserted on the inner peripheral side of the boss 107 and is splined to the side gear 117. The flange portion 109 includes an annular wall portion 125, a convex wall portion 127, and a hole portion 129. The annular wall portion 125 is provided so as to be located on the inner peripheral side of the flange portion 109. A plurality of the convex wall portions 127 protrude toward the outer diameter side of the annular wall portion 125 and are formed at intervals in the circumferential direction. A plurality of hole portions 129 are formed in the axial direction across the annular wall portion 125 and each of the plurality of formed convex wall portions 127. A bolt (not shown) for fixing a ring gear (not shown) that meshes with a drive pinion (not shown) for transmitting a driving force in a state where the cover 3 is assembled to the case main body 103 is inserted into the hole portion 129 and the differential case. A rotational driving force is transmitted to 101.

  The cover 3 includes a boss portion 17 and a flange portion 1. The outer peripheral side of the boss portion 17 is supported by the differential carrier via a bearing (not shown). Further, an axle (not shown) is inserted into the inner peripheral side of the boss portion 17, and the rotational driving force that is splined to the side gear 115 and input to the flange portion 1 is output to the axle side.

  The flange portion 1 includes a first wall portion 5, a second wall portion 7, an annular wall portion 9, a convex wall portion 11, and a hole portion 13. The first wall portion 5 is a wall surface on the side where the boss portion 17 is formed in the flange portion 1. The second wall portion 7 is an assembly surface on the side where the flange portion 1 is assembled to the flange portion 109 of the case main body 103.

  The annular wall portion 9 is provided so as to be located on the inner peripheral side of the flange portion 1. The annular wall portion 9 is composed of a first annular wall portion 19 and a second annular wall portion 21. The first annular wall portion 19 is located closest to the inner diameter side in the flange portion 1. The second annular wall portion 21 is located on the outer diameter side of the first annular wall portion 19. The axial thickness W2 of the second annular wall portion 21 is set to be thinner than the axial thickness W1 of the first annular wall portion 19.

  The convex wall portion 11 is continuously formed on the outer peripheral side of the first wall portion 5, protrudes from the outer peripheral side end portion 23 of the second annular wall portion 21 toward the outer diameter side, and is spaced in the circumferential direction. A plurality are formed. The axial thickness W3 of the convex wall portion 11 is set to be thinner than the axial thickness W2 of the second annular wall portion 21. Further, the convex wall portion 11 has the same thickness as the axial thickness W3 of the convex wall portion 11, and is continuous with the wall surface of the convex wall portion 11 toward the second annular wall portion 21. Is formed. The axial thickness W1 of the first annular wall portion 19, the axial thickness W2 of the second annular wall portion 21, and the axial thickness W3 of the convex wall portion 11 are removed from the inner diameter side of the flange portion 1. Although the thickness is gradually reduced toward the radial side, the thickness may be continuously reduced from the inner diameter side to the outer diameter side of the flange portion 1.

  A plurality of hole portions 13 are formed along the axial direction at the center of the annular portion formed by the convex wall portion 11 and the concave wall surface 25. A bolt for fixing a ring gear that meshes with a drive pinion for transmitting a driving force in a state where the cover 3 is assembled to the case main body 103 is inserted into the hole portion 13. Further, the radius R1 from the axis of the cover 3 to the outer peripheral side end 23 of the second annular wall portion 21 is set to be equal to or larger than the radius R2 from the axis of the cover 3 to the center of the hole 13.

  In such a flange portion 1, between the two hole portions 13, 13 adjacent to each other in the circumferential direction among the plurality of hole portions 13 formed in the circumferential direction, from the axial center side of the cover 3 toward the outer diameter side. Ribs 15 are provided.

  The rib 15 includes a first rib 27 and a second rib 29. The first rib 27 is provided on the outer diameter side of the second annular wall portion 21 so as to be continuous with the wall surface of the second annular wall portion 21 and adjacent to the concave wall surface 25. The second rib 29 is formed to protrude on the surface of the first rib 27. The second ribs 29 are formed radially from the first annular wall portion 19 toward the outer peripheral side end portion 23 of the second annular wall portion 21. Further, the radius R1 from the axis of the cover 3 to the outer peripheral end 23 of the first and second ribs 27 and 29 is set to be equal to or greater than the radius R3 from the axis of the cover 3 to the hole 13 position. . Thus, the 1st, 2nd ribs 27 and 29 are formed between the two concave wall surfaces 25 and 25 adjacent to the circumferential direction.

  The second ribs 29 do not have to be formed in a radial shape, and may have a radial shape (spiral shape) that is inclined in the rotational direction. Further, the rib 15 may be provided not on the flange portion 1 of the cover 3 but on the flange portion 109 of the case main body 103. The radius from the axial center of the cover 3 to the outer peripheral side end of the rib 15 and the radius from the axial center of the cover 3 to the outer peripheral side end 23 of the second annular wall portion 21 are set as R1. The radius from the axial center of 3 to the outer peripheral side end of the rib 15 is not limited to this, and may be set to a radius R3 or more from the axial center of the cover 3 to the hole 13 position.

  In such a flange structure, the mass around the convex wall portion 11 in which the hole portion 13 is formed on the outer diameter side of the flange portion 1 of the cover 3 is reduced and the weight is effectively reduced, and the rib 15 is provided. By providing, the rigidity of the flange part 1 is securable.

  Further, since the axial thickness W3 of the convex wall portion 11 is set to be thinner than the axial thicknesses W1 and W2 of the first and second annular wall portions 19 and 21, the rigidity of the flange portion 1 can be ensured. Weight reduction can be performed more effectively.

  Furthermore, since the rib 15 is formed by combining the first rib 27 and the second rib 29, the deformation of the flange portion 1 can be effectively prevented.

  Further, by providing the first and second annular wall portions 19 and 21 having different thicknesses, it is possible to more effectively secure the rigidity and reduce the weight of the flange portion 1.

  Further, the center position of the hole 13 that is the thinnest in the circumferential direction is reinforced by the outer peripheral end 23 of the second annular wall 21 so that the rotational driving force is input to and output from the convex wall 11. Can also effectively ensure rigidity.

  Further, by reinforcing the position of the hole 13 that is the thinnest in the circumferential direction with the first and second ribs 27 and 29, the rigidity can be effectively increased even if the rotational driving force is input to and output from the convex wall 11. Can be secured.

  Furthermore, since the concave wall surface 25 is formed on the second annular wall portion 21, the annular wall portion 9 can be reduced in weight by the concave wall surface 25.

  Further, since the first rib 27 is formed between the two concave wall surfaces 25, 25 adjacent in the circumferential direction, the first rib 27 can be formed simultaneously with the formation of the concave wall surface 25.

  Further, even if the differential case 101 has a divided structure composed of the cover 3 and the case main body 103, the flange portions 1 and 109 have the annular wall portions 9 and 125, the convex wall portions 11 and 127, and the hole portions 13 and 129, respectively. , And at least one of the flange portions 1 and 109 includes the ribs 15, it is possible to achieve optimal weight reduction and rigidity.

  In the present embodiment, the rotational driving force is input to the differential case 101. However, the present invention is not limited to this, and the rotational driving force may be output from the differential case 101. In this case as well, the flange structure of the present embodiment is used. By applying, the rigidity of the flange portion can be ensured and the weight can be reduced.

  In addition, in the design represented by the drawings from FIG. 4 to FIG. 13 in relation to the present embodiment, the part indicated by a solid line is a part that is about to receive design registration as a partial design. The alternate long and short dash line is a line that indicates only the boundary between the part that is to receive design registration as a partial design and other parts.

It is sectional drawing of the differential case which accommodated the differential mechanism and differential limiting mechanism of one Embodiment. It is sectional drawing of the cover of one Embodiment. It is a front view of the cover of one Embodiment. It is a front view of a differential case. It is a bottom view of a differential case. It is a left view of a differential case. It is a right view of a differential case. It is a top view of a differential case. It is a rear view of a differential case. It is a reference drawing which shows the principal part cutting location of a differential case. It is sectional drawing of a cover. It is a reference drawing which shows the cutting | disconnection location of a differential case. FIG. 13 is a sectional view taken along the line B-C-D-E-F-G-H in FIG. 12.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Flange part 1,109 ... Flange part 3 ... Cover 5 ... 1st wall part 7 ... 2nd wall part 9,125 ... Annular wall part 11 ... Convex wall part 11,127 ... Convex wall part 13,129 ... Hole 15 ... Rib 19 ... First annular wall 21 ... Second annular wall 23 ... Outer end of second annular wall 25 ... Concave wall 27 ... First rib 29 ... Second rib DESCRIPTION OF SYMBOLS 101 ... Differential case 103 ... Case main body R1 ... Radius from cover axial center to outer peripheral side end of second annular wall (rib) R2 ... Radius from cover axial center to hole center R3 ... Cover axis Radius from core to hole position W1... Axial thickness of first annular wall W2... Axial thickness of second annular wall W3... Axial thickness of convex wall

Claims (5)

A flange portion provided on the rotating member, an annular wall portion provided so as to be positioned on the inner peripheral side, and formed continuously on the outer peripheral side of the annular wall portion, and directed toward the outer diameter side A plurality of convex wall portions that protrude and protrude in the circumferential direction, and are formed in the axial direction across the annular wall portion and each of the plurality of convex wall portions. And a flange structure to which a member for transmitting a rotational driving force provided with a hole is fixed,
The annular wall portion is provided between two holes adjacent in the circumferential direction among the plurality of holes formed in the circumferential direction from the axial center side to the outer diameter side of the rotating member. Provided ribs,
The rib includes a first rib and a second rib, and the second rib is formed so as to protrude on the surface of the first rib ,
The radius from the axis of the rotating member to the outer peripheral side end of the annular wall is set to be greater than or equal to the radius from the axis of the rotating member to the center of the hole,
The axial thickness of the convex wall is set thinner than the axial thickness of the annular wall,
A radius from the axis of the rotating member to the outer peripheral end of the rib is set to be greater than or equal to a radius from the axis of the rotating member to the hole position. A flange structure to which members are fixed. A flange structure to which a member for transmitting a rotational driving force according to claim 1 is fixed,
The annular wall portion includes a first annular wall portion located on the inner diameter side, and a second annular wall portion provided on the outer diameter side and provided with the rib. A flange structure to which a member for transmitting a rotational driving force is fixed, wherein an axial thickness is set to be thinner than an axial thickness of the first annular wall portion. A flange structure to which a member for transmitting a rotational driving force according to claim 1 or 2 is fixed,
A member for transmitting a rotational driving force is characterized in that a concave wall surface is formed around the plurality of formed hole portions toward the annular wall portion continuously with the wall surface of the convex wall portion. Fixed flange structure. A flange structure to which a member for transmitting a rotational driving force according to claim 3 is fixed,
The said rib is formed between the two said concave wall surfaces adjacent to the circumferential direction, The flange structure to which the member which transmits the rotational drive force fixed is fixed. A flange structure to which a member for transmitting a rotational driving force according to any one of claims 1 to 4 is fixed,
The rotating member has two cylindrical members and flange portions formed on each of the cylindrical members, and each flange portion includes the annular wall portion, the convex wall portion, and the hole portion. A flange structure to which a member for transmitting a rotational driving force is fixed, wherein at least one of the flange portions includes the rib .

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