JP2019044848A - Drive plate - Google Patents

Abstract

To provide a drive plate improved in performance of flexibility by elastic deformation.SOLUTION: A central portion of a drive plate 1 is provided with a crank shaft mounting hole 14 to be mounted on a crank shaft 2. An outer peripheral portion of the drive plate 1 is provided with a torque converter mounting portion 18 to be mounted on a torque converter 3. The torque converter mounting portion 18 has one end edge 21 and the other end edge 22 extended in parallel at an interval in a circumferential direction. The torque converter mounting portion 18 has an inner edge 23 linearly extended in a direction orthogonal to a radial direction between one end edge 21 and the other end edge 22. Lengths L of one end edge 21 and the other end edge 22 of the torque converter mounting portion 18 are shorter than a radial dimension D of the torque converter mounting portion 18 on a central position between one end edge 21 and the other end edge 22.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a drive plate.

  For example, in a vehicle equipped with an automatic transmission, the power from the engine is input to the automatic transmission via the torque converter, and the power shifted by the automatic transmission is driven via the differential gear (differential) etc. Transmitted to As automatic transmissions, continuously variable transmissions (CVTs) and automatic transmissions (ATs) are widely known.

  The crankshaft of the engine extends towards the automatic transmission, at the tip of which a central part of a substantially disc-shaped drive plate is attached. The outer peripheral portion of the drive plate is connected to a torque converter. Thereby, the crankshaft and the torque converter are connected via the drive plate.

  For example, when the engine is started, the power of the starter is input to the drive plate, and the power is used to rotate the crankshaft integrally with the drive plate to crank the engine. After starting the engine, the drive plate transmits power from the engine to the torque converter.

JP 2001-132817 A

  In addition, the drive plate needs to be elastically deformed so as to absorb engine vibration and the like, and to absorb misalignment (axial misalignment) between the rotational axis of the crankshaft and the rotational axis of the torque converter.

  FIG. 3 is a front view of a conventional drive plate 101. As shown in FIG.

  At a central portion of the drive plate 101, a circular crankshaft mounting portion 102 recessed one step toward the crankshaft side is formed. In the crankshaft mounting portion 102, six crankshaft mounting holes 103 for fastening to the crankshaft with a bolt are formed at equal angular intervals, that is, at 60 ° intervals.

  The outer peripheral portion 104 of the drive plate 101 is recessed one step toward the crankshaft. In the outer peripheral portion 104, a concave torque converter mounting portion 105 is formed at the same position in the circumferential direction as each of the six crankshaft mounting holes 103, and is further recessed one step toward the crankshaft side. The tip end surfaces of bosses (nut portions) provided on the torque converter are in contact with the respective torque converter mounting portions 105. Each torque converter mounting portion 105 is formed with a torque converter mounting hole 106 for fastening to the torque converter with a bolt.

  Each torque converter mounting portion 105 extends radially inward from one end edge 107 and the other end edge 108 extending in parallel at intervals in the circumferential direction and the end edge on the rotation center side of the outer peripheral portion 104. It is convexly curved outward, and is formed in a shape having both ends 107 and an inner end 109 connected to the other end 108. Therefore, the one end edge 107 and the other end edge 108 of each torque converter mounting portion 105 act as a rib which increases the rigidity of the outer peripheral portion 104, which lowers the bending performance due to the elastic deformation of the drive plate.

  An object of the present invention is to provide a drive plate in which the performance of deflection by elastic deformation is improved.

  In order to achieve the above object, a drive plate according to the present invention is a disk-shaped drive plate which connects a crankshaft of an engine and a torque converter, and is mounted on the crankshaft at a central portion surrounding a rotation center. A crankshaft mounting portion for the motor is formed, and an outer peripheral portion radially outward of the crankshaft mounting portion has a concave shape recessed toward one side in the rotation axis direction, and a torque converter mounting portion for mounting to a torque converter Is formed, the torque converter mounting portion has one end and the other end circumferentially spaced apart in parallel, and the lengths of the one end and the other end are the one end and the other end Smaller than the radial dimension of the torque converter mounting at the central position between

  According to this configuration, the crankshaft mounting portion for attachment to the crankshaft is formed at the central portion of the drive plate. A torque converter attachment for attachment to the torque converter is formed on the outer peripheral portion of the drive plate.

  In the configuration shown in FIG. 3, the lengths of one end 107 and the other end 108 of torque converter mounting portion 105 are the diameter of torque converter mounting portion 105 at the central position between one end 107 and the other end 108. Larger than the dimension of the direction. On the other hand, in the configuration of the present invention, the length of one end edge and the other end edge of the torque converter attachment is determined by the radial dimension of the torque converter attachment at the center position between the one end and the other edge. Too small. Therefore, in the configuration of the present invention, compared with the configuration shown in FIG. 3, the one end edge and the other end edge of the torque converter mounting portion act as ribs to lessen the enhancement and the deflection performance by the elastic deformation of the drive plate high.

  Further, in the configuration shown in FIG. 3, since the inner end edge 109 is convexly curved outward in the radial direction, a stress wave is generated when a load due to the shaft offset between the crankshaft and the torque converter is applied to the torque converter mounting portion. It easily propagates along the inner edge 109 toward the one end edge 107 and the other end edge 108, and stress concentration is likely to occur at the connection portion between the inner edge 109 and the one end edge 107 and the other end edge 108.

  Therefore, the torque converter mounting portion has an inner edge extending in a straight line or in a convexly curved shape on the rotation center side between the end on the rotation center side of one end edge and the end on the rotation center side of the other end edge Is preferred.

  In this configuration, when a load due to an offset between the crankshaft and the torque converter is applied to the torque converter mounting portion, the stress wave propagates radially inward from the inner end edge, and the stress wave along the inner end edge And since it is hard to propagate to the other end side, it is possible to suppress the occurrence of stress concentration at the connection portion between the inner end and the one end and the other end.

  According to the present invention, it is possible to improve the deflection performance due to the elastic deformation of the drive plate.

FIG. 1 is a cross-sectional view of a drive plate according to an embodiment of the present invention, showing both a crankshaft and a torque converter. It is a front view of a drive plate. It is a front view of the conventional drive plate.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

<Configuration of Drive Plate>
FIG. 1 is a cross-sectional view of a drive plate 1 according to an embodiment of the present invention, showing both a crankshaft 2 and a torque converter 3. FIG. 2 is a front view of the drive plate 1 (a view from the side of the crankshaft 2). In addition, in FIG. 1, provision of the hatching which shows a cross section is abbreviate | omitted.

  The drive plate 1 is used in a vehicle equipped with an automatic transmission, and connects a crankshaft 2 of the engine and the torque converter 3. The drive plate 1 is formed by plastic working from a metal disk. The drive plate 1 is integrally provided with a disk-shaped main body portion 11 and a ring gear 12 surrounding the outer periphery of the main body portion 11. The outer peripheral end 13 of the main body 11 is bent toward the torque converter 3 to form a flat cylindrical shape, and the ring gear 12 is formed on the outer peripheral surface of the outer peripheral end 13.

  The ring gear 12 may be fixed to the outer peripheral end 13 of the main body 11 by welding, or may be integrally formed with the outer peripheral end 13 by plastic working (rolling) of the outer peripheral end 13.

  At the central portion of the main body portion 11, a circular crankshaft mounting portion 14 recessed one step toward the crankshaft 2 side is formed by drawing. A circular crankshaft insertion hole 15 is formed at the center of the crankshaft mounting portion 14. Further, in the crankshaft mounting portion 14, six circular crankshaft mounting holes 16 are provided at equal angular intervals on the same circumference concentric with the crankshaft insertion hole 15, that is, 60 ° around the crankshaft insertion hole 15. At intervals, they are formed through the crankshaft mounting portion 14.

  An annular outer peripheral portion 17 along the outer peripheral end 13 of the main body portion 11 is recessed by one step toward the crankshaft 2 by drawing. A recessed torque converter mounting portion 18 is formed on the outer peripheral portion 17 at the same position in the circumferential direction as each of the six crankshaft mounting holes 16 and is further recessed one step toward the crankshaft 2 side. Each torque converter mounting portion 18 is formed with a circular torque converter mounting hole 19 penetrating the torque converter mounting portion 18.

  The torque converter mounting portion 18 has one end edge 21 and the other end edge 22 extending in parallel at intervals in the circumferential direction. Further, the torque converter mounting portion 18 is connected between the one end 21 and the other end 22 to the inner end 23 extending linearly in the direction orthogonal to the radial direction, the one end 21 and the inner end 23. Connected to the first arc-shaped edge 24 convexly curved to the outside of the torque converter mounting portion 18, the other end 22 and the inner edge 23, and convexly curved to the outside of the torque converter mounting portion 18 And an arc-shaped second arc-shaped end 25. Thereby, the length L of the one end edge 21 and the other end edge 22 is determined by the radial position of the torque converter mounting portion 18 at the center position between the one end edge 21 and the other end edge 22, ie, the center of the inner end edge 23. It is smaller than the dimension D.

  A circular first lightening hole 26 for reducing the weight of the drive plate 1 is provided at each position in the middle of the torque converter mounting portion 18 adjacent in the circumferential direction with the outer peripheral portion 17 and the annular portion 27 on the rotation center side. It is formed across the level difference that

  Further, in the annular portion 27 between the crankshaft mounting portion 14 and the outer peripheral portion 17, each position between the crankshaft mounting hole 16 and the torque converter mounting hole 19 formed at the same position in the circumferential direction is A second lightening hole 51 consisting of an elongated hole is formed. The second lightening hole 51 has an inner end edge 52 extending in a convexly curved manner on the rotation center side (radially inner side), and an outer end extending linearly at a position radially outward with respect to the inner end edge 52. The edge 53, an end of the inner edge 52 connected to one end of the inner edge 52 and one end of the outer edge 53, and an arc-shaped one edge 54 convexly curved outward of the second lightening hole 51; The other end and the other end of the outer end edge 53 have an arc-shaped other end edge 55 that is convexly curved outward of the second lightening hole 51.

<Mounting of drive plate>
The crankshaft 2 has a flange portion 32 projecting radially outward from the entire circumference on the base end side of the substantially cylindrical tip portion 31. Screw holes 33 are formed in the flange portion 32 at positions respectively corresponding to the six crankshaft mounting holes 16 of the drive plate 1.

  The tip end portion 31 of the crankshaft 2 is inserted into the crankshaft insertion hole 15 of the drive plate 1, and the torque of the bolt 34 is in a state where the flange portion 32 of the crankshaft 2 abuts on the crankshaft attachment portion 14 of the drive plate 1. The drive plate 1 is fixed to the crankshaft 2 by being screwed into the screw hole 33 through the crankshaft mounting portion 14 from the converter 3 side.

  The torque converter 3 includes a front cover 41 at an end on the crankshaft 2 side. Bosses 42 are provided on the surface of the front cover 41 on the side of the crankshaft 2 at positions corresponding to the six torque converter mounting holes 19 of the drive plate 1. The boss 42 has a configuration in which the inner peripheral surface of a cylindrical member is threaded, and is fixed to the front cover 41 by welding.

  With the torque converter mounting portion 18 of the drive plate 1 in contact with the tip end surface of the boss 42, the drive plate 1 is torque converter by screwing the bolt 43 from the drive plate 1 side through the torque converter mounting hole 19 into the boss 42 It is fixed to 3.

  With the drive plate 1 fixed to the crankshaft 2 and the torque converter 3 respectively, the power of the starter is input to the ring gear 12 of the drive plate 1 when starting the engine, whereby the crankshaft 2 is integrated with the drive plate 1. Rotates to crank the engine. After the start of the engine, drive plate 1 transmits power from the engine to torque converter 3. Further, the drive plate 1 is bent by elastic deformation to absorb engine vibrations and the like, and to absorb deviation (axial deviation) between the rotational axis of the crankshaft 2 and the rotational axis of the torque converter 3.

<Function effect>
As described above, the crankshaft mounting portion 14 for attachment to the crankshaft 2 is formed at the central portion of the drive plate 1. A torque converter mounting portion 18 for attachment to the torque converter 3 is formed on the outer peripheral portion 17 of the drive plate 1.

  In the configuration shown in FIG. 3, the lengths of one end 107 and the other end 108 of torque converter mounting portion 105 are the diameter of torque converter mounting portion 105 at the central position between one end 107 and the other end 108. Larger than the dimension of the direction.

  On the other hand, in the configuration shown in FIG. 2, the length L of one end 21 and the other end 22 of the torque converter mounting portion 18 is a torque converter at a central position between the one end 21 and the other end 22. It is smaller than the radial dimension D of the mounting portion 18. Therefore, in the configuration shown in FIG. 2, compared with the configuration shown in FIG. 3, the increase by the one end 21 and the other end 22 of the torque converter mounting portion 18 acting as ribs is small, and the elasticity of the drive plate 1 is High deflection performance due to deformation.

  Further, in the configuration shown in FIG. 3, since the inner end edge 109 is convexly curved outward in the radial direction, a stress wave is generated when a load due to the shaft offset between the crankshaft and the torque converter is applied to the torque converter mounting portion 18 Tends to propagate along the inner edge 109 toward the one end edge 107 and the other end edge 108, and a stress concentration is likely to occur at the connection portion between the inner edge 109 and the one end edge 107 and the other end edge 108.

  On the other hand, the torque converter mounting portion 18 has an inner end edge 23 linearly extending between the end on the rotation center side of the one end edge 21 and the end on the rotation center side of the other end edge 22.

  In this configuration, when a load due to an offset between the crankshaft 2 and the torque converter 3 is applied to the torque converter mounting portion 18, the stress wave propagates radially inward from the inner end edge 23 and the stress wave becomes the inner end edge 23. Since it is difficult to propagate along one end edge 21 side and the other end edge 22 side, the vicinity of the 1st circular edge 24 which is the connection portion of the inner edge 23 and the one end edge 21 and the inner edge 23 and the other edge It is possible to suppress the occurrence of stress concentration in the vicinity of the second arcuate edge 25 which is a connecting portion with the edge 22.

  And since the strength of the drive plate 1 is increased by the relaxation of the stress concentration, the size of the first lightening hole 26 and the second lightening hole 51 can be increased accordingly, and the weight reduction of the drive plate 1 can be achieved. .

<Modification>
As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form.

  For example, although the inner end edge 23 of the torque converter mounting portion 18 linearly extends in the direction orthogonal to the radial direction, it may extend in an arc shape which is convexly curved inward in the radial direction.

  The number of crankshaft insertion holes 15 is not limited to six, and may be set arbitrarily, and may be two to five, or seven or more. However, it is preferable that the crankshaft insertion holes 15 be formed at equal angular intervals on the same circumference regardless of the number thereof.

  Similarly, the number of torque converter mounting holes 19 is not limited to six, and may be set arbitrarily, may be two to five, or seven or more.

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

1: Drive plate 2: Crankshaft 3: Torque converter 14: Crankshaft mounting portion 17: Outer peripheral portion 18: Torque converter mounting portion 21: One end edge 22: Other end edge 23: Inner end edge D: Dimension L: Length

Claims (1)

A disk-like drive plate connecting a crankshaft of an engine and a torque converter,
A crankshaft attachment for attachment to the crankshaft is formed at a central portion surrounding a rotation center,
The outer peripheral portion radially outward of the crankshaft mounting portion has a concave shape which is recessed on one side in the rotational axis direction, and a torque converter mounting portion for mounting on the torque converter is formed.
The torque converter mounting portion has one end edge and the other end edge extending in parallel at circumferentially spaced intervals,
A drive plate having a length of the one end edge and the other end edge smaller than a radial dimension of the torque converter attachment at a central position between the one end edge and the other end edge.

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