JP6027840B2 - Carrier plate in planetary gear mechanism carrier - Google Patents

Description

  The present invention relates to a carrier plate constituting a carrier of a planetary gear mechanism used for an automobile transmission or the like.

  As a carrier of a planetary gear mechanism used for an automobile transmission or the like, there is a carrier composed of a carrier base and a carrier plate. The carrier plate is provided with legs that are spaced at equal intervals in the circumferential direction, and the legs are welded and fixed to the carrier base. Therefore, a space part that is spaced apart in the circumferential direction is formed between the opposed surfaces of the carrier plate and the carrier base, and this space part constitutes a pinion gear storage part. There is a press-molded product made from a metal plate as the carrier plate. In this case, the plate consists of a disk-shaped portion that becomes the base of the carrier plate by pressing and a radially extending portion that becomes the leg of the carrier plate. The intermediate material is punched out, and the radial portion of the intermediate material is press-bended to form a leg. Since it is difficult to make the base plane at the transition from the leg by bending as it is, a notch is provided on the peripheral surface at the transition part to the radially extending part in the intermediate material so as to block the influence of the bending process. (Patent Document 1).

  There is also a carrier plate made of a sintered product (Patent Document 2). In the case of a sintered carrier plate, the leg portion connecting the base portion to the carrier base is configured to have a considerably large dimension not only in the circumferential direction but also in the radial direction so as to have sufficient rigidity.

JP-A-8-300084 JP-A-7-208585 Japanese Patent Application No. 2011-099503

  The presence of a notch as a press-formed product inevitably causes a decrease in bending rigidity in the circumferential direction.In relation to the required specifications such as torque increase, the size of the leg in the circumferential direction is increased, If measures are taken to increase rigidity by increasing the wall thickness, there is a problem that the pinion gear cannot be stored in the layout if it is the same size, and it may be necessary to increase the size and the weight will increase. The demand for space saving and weight reduction cannot be met.

  In addition, there is a press-molded product in which a step is formed on the carrier plate at the connection portion with the leg (Patent Document 3), and ribs facing in the circumferential direction are formed by the step, which is small but excellent in strength. However, in the case of press working, there is a problem that it is difficult to obtain a drawing allowance for obtaining a step having a necessary height, and it is difficult to reduce the size.

  On the other hand, in the case of a sintered product, there is no problem in terms of rigidity, but the cost is a considerable disadvantage compared to a pressed product.

  The present invention has been made in view of the above-mentioned problems, and has high rigidity substantially equal to that of a sintered product while maintaining the thickness and leg width of the plate material despite being a press-formed product from the plate material. The purpose is to realize.

According to the present invention, there is provided a carrier plate that is a press-formed product of a plate material that is fixed to a carrier base and constitutes a carrier of a planetary gear mechanism, and a plurality of carrier plates are installed at a distance from a base portion in a circumferential direction. , and a leg portion which is bent toward the carrier base at the peripheral edge of the base portion, the base has a recess toward the carrier base side connection portion between the leg portion, the recess in the circumferential direction A pair of side wall surfaces opposed to each other at a distance and a bottom wall surface connecting the pair of side wall surfaces, and the leg portion is lowered on the carrier base side with respect to the general surface of the base portion, extending from the outer end portion, and said bottom wall is real up to the connection portion between the leg portion in the radially outward at the base than the downward bent portion relative to the base generally face in the radial direction inner side of said base It extends at a predetermined inclination angle, each of said pair of side wall surfaces facing in circumferentially spaced carrier plate which forms a substantially triangular shape is provided.

  The base may be configured to be connected to the leg while substantially maintaining the outer diameter. That is, there is no notch or substantially no notch between the base and the leg.

  And in the carrier plate press molding method of the present invention, an intermediate material consisting of a disk-shaped part that becomes the base part of the carrier plate by pressing and a radially extending part that becomes the leg part of the carrier plate is obtained from the plate material. The carrier plate is formed by cut-molding and press-molding a concave portion at a connection portion with a radially extending portion at the outer peripheral portion of the disk-shaped portion in the intermediate material, and then press-bending the extended portion of the intermediate material extending from the concave portion. To form.

  By pressing the recess in the extension of the leg on the outer periphery of the base of the carrier plate, the circumferentially spaced triangular side walls forming the recess become ribs, and the leg is the bottom wall of the recess The rigidity of the carrier plate in the circumferential direction can be increased in combination with the configuration extending from. Therefore, even if the wall thickness is reduced or the width of the legs is reduced, the required rigidity can be ensured, the degree of freedom in layout of pinion gears and the like is increased, and the possibility of application to many vehicle types is expanded. This can reduce the weight of the parts.

  In addition, the concave part consists of a circumferentially spaced side wall and a bottom wall bent from the base part to the carrier base side, so there is little drawing allowance in the press work, and the press work is easy, and a triangular rib is required. It is possible to ensure a sufficient strength.

FIG. 1 is a perspective view of a planetary gear carrier having a carrier plate according to the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a plan view of an intermediate material which is a press product for obtaining the carrier plate of FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3, and shows steps (a), (b), and (c) when the carrier plate in FIG. 1 is pressed from an intermediate material.

  The planetary gear carrier of the present invention is used for an automatic transmission of an automobile, etc. FIG. 1 is a perspective view showing an example thereof. The carrier for planetary gears includes a carrier base 10 and a carrier plate 12, and the carrier base 10 and the carrier plate 12 are formed by pressing from a plate material having a predetermined thickness, and are integrated as a carrier by joining such as welding. The carrier base 10 includes a center hole 10 'through which a center axis (not shown) of the planetary gear mechanism is inserted at the center, and a tooth portion 10-1 is formed on the outer periphery. The carrier of this embodiment is of a type in which the teeth 10-1 on the outer periphery of the carrier base 10 are engaged with the internal teeth (splines) of a clutch drum (not shown) provided on the outer side, but the present invention is of this type. Of course, the present invention can also be applied to a carrier base itself having a drum shape with an outer peripheral portion projecting into a cylindrical shape. The carrier plate 12 includes a center hole 12 ′, and includes a base portion 14 as an annular disk and three leg portions 16 bent from the outer peripheral surface of the base portion 14 toward the carrier base 10. At a position facing the three leg portions 16, the carrier base 10 forms three arcuate holes 20, corresponding leg portions 16 are inserted into the respective arcuate holes 20, and the insertion portions are welded. The carrier base and the carrier plate are assembled as a carrier. In this assembled state, the space between the carrier base 10 and the carrier plate 12 is divided into three spaces in the circumferential direction by the three leg portions 16, and each space serves as a storage space for a pinion gear (not shown). The pinion gear is pivotally supported between the carrier base 10 and the carrier plate 12. In this embodiment, the pinion gear has a so-called double gear configuration, and a pinion gear in the form of a helical gear that meshes with each other is mounted in each pinion gear storage space. Therefore, the carrier base 10 and the carrier plate 12 are opposed to each other. Two pinion shaft support holes are provided for each pinion gear storage space, such as 10A, 12A; 10B, 12B. The pinion support shafts are inserted and supported by the pinion shaft support holes 10A, 12A; 10B, 12B formed in the carrier base 10 and the carrier plate 12. In this embodiment, the center holes 10 ′ and 12 ′ of the carrier base 10 and the carrier plate 12 are flawless holes, and the center axis (not shown) is freely inserted. It goes without saying that the present invention is naturally applicable to a type in which a single-sided or double-sided boss part having splines formed on the inner periphery or outer peripheral part is integrally formed at the center of the carrier plate and is spline-fitted with the central shaft. Nor.

  According to the present invention, as shown in FIG. 1, the base portion 14 of the carrier plate 12 has the concave portion 18 toward the carrier base 10 at a portion close to the outer peripheral portion. That is, each concave portion 18 is located at a connection portion between the base portion 14 and the leg portion 16. By providing the recesses 18, the leg portions 16 are extended toward the carrier base 10 from the portions that are stepped down from the general surface of the base portion 14. In this embodiment in which three legs 16 are provided, three recesses 18 are provided at intervals in the circumferential direction. Each concave portion 18 starts from a portion somewhat close to the central hole 12 in the base portion 14 of the carrier plate 12 in the radial direction and extends from the general surface of the base portion 14 to the outer peripheral portion, and is continuous with the leg portion 16. . The concave portion 18 has a bottom wall surface 18A that is linearly inclined from the general surface of the base portion 14 toward the carrier base 10 at a substantially constant angle (see also FIG. 2 for the inclination of the bottom wall surface 18A), and a circle across the bottom surface 18A. Each of the leg portions 16 extends from the outer peripheral end portion of the bottom wall surface 18A of the corresponding concave portion 18 without being notched and without changing its width. Has been. As shown in FIGS. 1 and 2, the circumferentially opposed side wall surfaces 18B-1 and 18B-2 are substantially triangular as viewed from the front. In the present invention, the recess 18 that connects the base portion 14 and the leg portion 16 includes the triangular side wall surfaces 18B-1 and 18B-2 facing each other in the circumferential direction, and the triangular side wall surfaces 18B-1 and 18B. -2 and is composed of a bottom wall surface 18A that is inclined directly from the base portion 14 toward the carrier base 10, and in this configuration, the triangular side wall surfaces 18B-1 and 18B-2 serve as reinforcing ribs. Thus, the circumferential rigidity of the carrier plate 12 can be increased. In addition, the inclined structure of the bottom wall surface 18A is easy to press-form from a blank because a drawing allowance during press working from a plate material described later is small, and triangular side wall surfaces 18B-1 and 18B-2. Therefore, it is easy to secure the necessary rigidity.

  In the carrier plate 12 of this embodiment, the base portion 14 is connected to the leg portion 16 through the recess 18 while maintaining the outer periphery thereof, and is not provided with a notch portion in the carrier plate of the conventional press product, but for the purpose of improving the efficiency of the bending process. It is possible to provide a small notch at the base of the leg.

  Next, the press forming method of the carrier plate 12 according to the present invention will be described. A steel plate as a raw material has a predetermined thickness, and a disc-shaped portion serving as a base portion of the carrier plate from the steel plate as shown in FIG. 30 and a radially extending portion 32 serving as a leg portion of the carrier plate, and an intermediate material having an opening 34 serving as a center hole 12 'of the carrier plate 12 at the center is pressed (see FIG. 4 (a)). reference).

  As a next step, a concave portion is press-formed by press at a connection portion with a radially extending portion 32 in the outer peripheral portion of the disc-like portion 30 in the intermediate material. In FIG. 3, the contour shape from the upper surface of the concave portion to which the two-dot chain line 36 should be attached is shown, while FIG. 4 (b) shows the state after press molding of the concave portion 36, and each in the concave portion 18 of the carrier plate 12 as a product. Then, the bottom wall surface portion 36A and the side wall surface portion 36B to be the bottom wall surface 18A and the triangular side wall surface 18B-1 (and 18B-2) are formed.

  Then, after forming the recess 36B, the intermediate material extending portion 32 extending from the bottom wall surface portion 36A of the recess is press-bended so that the outer diameter surface is flush (the portion after press bending is shown in FIG. Show) Thereby, the carrier plate 12 of this invention is obtained.

  In the present invention, the base part of the leg portion extending from the support plate (the part shown by p in FIG. 3 as the material before the bending process) is slightly cut out (from the carrier plate as the product) from the viewpoint of easy bending. A size that does not substantially affect the rigidity in the circumferential direction), which is also included in the present invention.

  In the carrier plate of the present invention, the rigidity in the circumferential direction can be increased by providing the concave portion 18 by press molding at the connection portion with the leg portion 16 at the outer peripheral portion of the base portion 12 of the carrier plate. That is, circumferential torque is applied to the carrier 12 from the pinion gear, and for this circumferential torque, a pair of side wall surfaces 18B-1 spaced apart in the circumferential direction constituting the recess 18 by press working and The structure connected to the leg portion 16 without interruption through 18B-2 functions as a tension, which contributes to an increase in rigidity. In the present invention, since the side wall surfaces 18B-1 and 18B-2 have a triangular shape, the degree of increase in rigidity is small compared to the shape of Patent Document 3, but the bottom surface is straight, so that when the press bending from the blank is performed. This is advantageous in terms of manufacturing technology in that the drawing allowance is small and there is no hindrance to press molding of a recess having a required depth.

DESCRIPTION OF SYMBOLS 10 ... Carrier base 12 ... Carrier plate 14 ... Base 16 of carrier plate ... Leg 18 of carrier plate ... Recess 18A of carrier plate ... Bottom wall surface of recess
18B-1, 18B-2... Side walls 30 facing the circumferential direction in the recesses... Intermediate material for forming the carrier plate of the present invention from a plate material

Claims (2)

A carrier plate that is a press-formed product of a plate material that is fixed to a carrier base and constitutes a carrier of a planetary gear mechanism, wherein a plurality of carrier plates are installed at intervals in the circumferential direction, and an outer peripheral edge of the base portion A pair of leg portions bent toward the carrier base, the base portion having a concave portion toward the carrier base side at a connecting portion with the leg portion, and the concave portion spaced apart from each other in the circumferential direction. And a bottom wall surface connecting the pair of side wall surfaces, and the leg portion extends from the outer peripheral side end portion of the bottom wall surface of the concave portion by lowering the height to the carrier base side with respect to the general surface of the base portion. issued, and said bottom wall is substantially constant inclination angle up to the connection portion between the leg portion in the radially outward at the base than the downward bent portion relative to the base generally face in the radial direction inner side of said base Extending and each of said pair of side wall surfaces facing in circumferentially spaced substantially a carrier plate which forms a triangular shape. 2. The carrier plate according to claim 1 , wherein the base portion is connected to the leg portion while substantially maintaining an outer diameter thereof.

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