JP2010236608A - Drive plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cranking sound of a drive plate generated at engine start. <P>SOLUTION: A press fit margin 30 for use when press-fitting a plate part 1a in a ring gear 1b is provided by forming the outer peripheral diameter of the plate part 1a slightly larger than the inner peripheral diameter of the ring gear 1b, the plate part 1a is press-fitted in the ring gear 1b to a position where the end of a rim 24 coincides with a side surface of the ring gear 1b, and the plate part 1a and the ring gear 1b are welded 6 at a plurality of welds 6. When engine starts, although torque is transmitted to the ring gear 1b from a starter motor and the ring gear 1 vibrates, an inner peripheral portion of the ring gear 1b and an outer peripheral portion of the plate part 1a rub with each other and vibration caused in the ring gear 1b is damped. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drive plate, and more particularly to a drive plate that can reduce cranking noise.

  Conventionally, a drive plate is used to transmit engine driving force to a torque converter of an automatic transmission. The drive plate is configured by welding a ring gear having a gear formed on the outer periphery to the outer periphery of a disk-shaped plate portion. An inner diameter portion of the plate portion of the drive plate is fastened to the crankshaft of the engine with bolts, and an outer diameter portion of the plate portion is fastened to the case of the torque converter with bolts. And the ring gear welded to the outer peripheral part of the drive plate is provided so that it may mesh with a starter motor gear. When starting the engine (cranking), the pinion gear of the starter motor is engaged with the ring gear and driven to rotate the drive plate. However, there is a problem that a cranking sound is generated by vibration caused by torque applied to the drive plate during cranking.

  Therefore, in a flywheel with a ring gear, which is directly connected to the crankshaft and provided with a ring gear engaged with and driven by the pinion gear of the starter, an uneven portion provided on the outer periphery of the flywheel and an uneven portion provided on the inner periphery of the ring gear Has been engaged through a predetermined space portion, and an elastic member is inserted into the space portion, whereby a flywheel with a ring gear that reduces vibration transmission to the flywheel during engagement has been proposed (for example, Patent Document 1). reference).

JP 2002-295589 A

  However, in the flywheel of Patent Document 1, since it is necessary to insert an elastic member, it is necessary to consider the durability of the elastic member, and there is a problem that the manufacturing cost is increased. Furthermore, in the case of a structure in which a ring gear is welded to the outer peripheral portion of the plate portion like a drive plate, it is difficult to apply the technique of Patent Document 1.

  Further, as shown in FIG. 7, since it is difficult to obtain the accuracy of the inner peripheral diameter of the ring gear portion 1b, when the ring gear portion 1b is welded to the outer peripheral portion of the plate portion 1a with a plurality of welded portions 6, the welded portion 6 A gap (clearance) 7 is generated between the welded portion 6 and the welded portion 6. If this clearance 7 is generated, there is a problem that the plate portion 1a and the ring gear portion 1b vibrate during cranking, thereby worsening the cranking sound. In particular, as shown in the result of the hammering test of the drive plate in FIG. 8, when the clearance is large (A) and the clearance is small (B), it can be seen that the cranking sound is worsened as the clearance is larger. . 8A and 8B, impulse inputs are at the same level, and the vertical axis is a comparison of acceleration levels divided by a predetermined acceleration value.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a drive plate that can reduce the cranking sound of the drive plate that is generated when the engine is started.

  In order to achieve the above object, a drive plate according to the present invention is a drive plate in which an outer peripheral portion of a plate portion and a ring gear meshing with a starter motor gear are welded by a plurality of weld portions, the weld portion and the weld portion. A portion for attenuating vibration caused when the starter motor meshes with the ring gear by friction between the plate portion and the ring gear is provided.

  According to the drive plate of the present invention, the vibration when the starter motor meshes with the ring gear between the welded portion where the outer peripheral portion of the plate portion and the ring gear are welded and the welded portion is attenuated by the friction between the plate portion and the ring gear. By providing the portion to be damped, the vibration generated in the ring gear during cranking is attenuated by the friction between the ring gear and the plate portion, and the cranking sound can be reduced.

  In the present invention, the outer peripheral diameter of the plate portion is made larger than the inner peripheral diameter of the ring gear, and the plate portion is press-fitted into the ring gear and then welded by the welded portion, or the outer peripheral portion of the plate portion or the ring gear. The inner peripheral portion of the ring portion is tapered, and the plate portion is press-fitted into the ring gear and then welded by the welded portion, or the outer peripheral portion of the plate portion or the inner peripheral portion of the ring gear is easily deformed in the radial direction. Then, after the plate portion is press-fitted into the ring gear, a portion that attenuates vibration by friction can be provided by welding at the welded portion.

  The plate part and the ring gear are made by press-fitting the plate part into the ring gear by making the outer peripheral diameter of the plate part larger than the inner peripheral diameter of the ring gear or by tapering the outer peripheral part of the plate part or the inner peripheral part of the ring gear. There can be provided a portion for attenuating vibration by friction between the plate portion and the ring gear without causing a clearance therebetween. In addition, by making the outer peripheral portion of the plate portion or the inner peripheral portion of the ring gear into an uneven shape that is easily deformed in the radial direction, it is possible to absorb fluctuations in the accuracy of the outer peripheral diameter of the plate portion and the inner peripheral diameter of the ring gear.

  As described above, according to the drive plate of the present invention, the effect that the cranking sound of the drive plate generated when the engine is started can be reduced by friction can be obtained.

It is sectional drawing at the time of connecting with the (A) top view and (B) crankshaft and torque converter of the drive plate of this Embodiment. It is a figure for demonstrating press injection of the plate part to the ring gear part of the drive plate of 1st Embodiment. It is a figure for demonstrating press injection of the plate part to the ring gear part of the drive plate of 2nd Embodiment. It is a figure for demonstrating press injection of the plate part to the ring gear part of the drive plate of the modification of 2nd Embodiment. It is a figure for demonstrating press injection of the plate part to the ring gear part of the drive plate of 3rd Embodiment. It is a figure for demonstrating the press injection of the plate part to the ring gear part of the drive plate of the modification of 3rd Embodiment. It is a figure for demonstrating the clearance which arises when ring gear welding is carried out to the outer peripheral part of a plate part. It is an image figure which shows the hammering test result of a drive plate in case (A) clearance is large and (B) clearance is small.

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

  FIG. 1 shows a first embodiment of a drive plate of the present invention. The drive plate 1 is a two-piece drive plate, and is composed of a plate portion 1a formed in a disk shape and a ring gear portion 1b welded to the outer peripheral portion of the plate portion 1a. A plurality of crankshaft mounting holes 2 for fastening with bolts 11 to the crankshaft 10 of the engine are formed in the vicinity of the inner diameter portion of the plate portion 1a (a total of six in this embodiment). In the vicinity of the outer peripheral portion, a plurality of torque converter mounting holes 3 for fastening with the bolts 22 to the mounting portion 21 of the torque converter 20 are formed along the circumferential direction (three in total in this embodiment at intervals of 120 °). Has been. The plate portion 1a is formed with a plurality of stiffness adjusting holes 4 (6 in total in this embodiment) between the torque converter mounting holes 3 adjacent in the circumferential direction along the circumferential direction. . As a result, the drive plate is made flexible so that it can follow the axial deformation of the torque converter 20 when the torque converter 20 repeats expansion and contraction due to changes in internal pressure.

  As shown in FIG. 2B, a rim portion 24 for welding the ring gear portion 1b is formed on the outer peripheral portion of the plate portion 1a. The outer peripheral diameter of the plate portion 1a is formed slightly larger than the inner peripheral diameter of the ring gear portion 1b, and a press-fitting allowance 30 for press-fitting the plate portion 1a into the ring gear portion 1b is provided. Thus, the press-fitting allowance 30 is provided, and the plate portion 1a is press-fitted into the ring gear portion 1b until the tip of the rim portion 24 coincides with the side surface of the ring gear portion 1b, and the plate portion 1a and the ring gear portion are welded at a plurality of locations. 1b is welded. The number of welded parts can be several at regular intervals in the circumferential direction, for example, the same part as the welded part 6 shown in FIG. Since the plate portion 1a is press-fitted into the ring gear portion 1b, no clearance is generated between the welded portion 6 and the welded portion 6.

  When the engine is started, torque is transmitted from the starter motor to the ring gear portion 1b, and the ring gear portion 1b vibrates. Between the welded portion 6 and the welded portion 6, the inner peripheral portion of the ring gear portion 1b and the outer periphery of the plate portion 1a. The vibration generated in the ring gear portion 1b is attenuated by rubbing with the portion, so that the cranking sound can be reduced.

  Next, a second embodiment of the drive plate of the present invention will be described. In addition, about the structure same as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 3B, a rim portion 24 for welding the ring gear portion 1b is formed on the outer peripheral portion of the plate portion 1a so as to be tapered outward in the radial direction of the plate portion 1a. ing. The taper-shaped angle is set such that the outer peripheral diameter at the distal end portion 24a of the rim portion 24 of the plate portion 1a is slightly larger than the inner peripheral diameter of the ring gear portion 1b. Thus, the rim portion 24 is tapered, and the plate portion 1a is press-fitted into the ring gear portion 1b until the tip of the rim portion 24 coincides with the side surface of the ring gear portion 1b. The part 1b is welded. Since the plate portion 1a is press-fitted into the ring gear portion 1b, no clearance is generated between the welded portion 6 and the welded portion 6.

  When the engine is started, torque is transmitted from the starter motor to the ring gear portion 1b, and the ring gear portion 1b vibrates. However, the ring gear portion 1b between the welded portion 6 and the welded portion 6 is the same as in the first embodiment. Since the inner peripheral portion of the plate and the outer peripheral portion of the plate portion 1a rub against each other, the vibration generated in the ring gear portion 1b is attenuated, so that the cranking sound can be reduced. Further, by making the rim portion 24 tapered, the accuracy control of the outer peripheral diameter of the plate portion 1a with respect to the inner peripheral diameter of the ring gear portion 1b can be relaxed, and further, due to variations in the outer peripheral diameter of the plate portion 1a, By press-fitting, it is possible to prevent excessive stress from being applied to the ring gear portion 1b and the plate portion 1a.

  As a modification of the second embodiment, as shown in FIG. 4, the inner peripheral portion of the ring gear portion 1b may be tapered. In this case, the taper angle is set such that the outer peripheral diameter of the corner portion 24b of the rim portion 24 of the plate portion 1a is slightly larger than the inner peripheral diameter of the long side surface side of the ring gear portion 1b.

  Note that the second embodiment may be configured to provide a press-fitting allowance as in the first embodiment.

  Next, a third embodiment of the drive plate of the present invention will be described. In addition, about the structure same as 1st and 2nd embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  Generally, since the inner peripheral surface of the ring gear portion 1b is heat-treated after processing, it is difficult to obtain the accuracy of the inner peripheral diameter of the ring gear portion 1b. For this reason, when the outer peripheral surface of the plate portion 1a is a substantially perfect circle, there is a possibility that a large clearance is locally generated at a location where the distortion after the heat treatment of the ring gear portion 1b is large.

  Therefore, in the third embodiment, as shown in FIG. 5, the rim portion 24 is formed in an uneven shape that is easily deformed in the radial direction of the plate portion 1a. A press-fitting allowance 30 is provided between the plate portion 1a and the ring gear portion 1b, as in the first embodiment. In this way, the rim portion 24 is formed in an uneven shape, and the plate portion 1a is press-fitted into the ring gear portion 1b until the tip of the rim portion 24 coincides with the side surface of the ring gear portion 1b. And the ring gear portion 1b are welded. The distortion of the ring gear portion 1b is absorbed by the radial deformation of the concavo-convex shape of the rim portion 24, and no large clearance is locally generated.

  By making the rim portion 24 uneven, a slight clearance is generated between the plate portion 1a and the ring gear portion 1b. However, a plate portion for attenuating vibration generated in the ring gear portion 1b during cranking by friction. If the contact portion between 1a and the ring gear portion 1b can be secured, it is not necessary to completely eliminate the clearance.

  When the engine is started, torque is transmitted from the starter motor to the ring gear portion 1b and the ring gear portion 1b vibrates. Between the welded portion 6 and the welded portion 6, the inner peripheral portion of the ring gear portion 1b and the rim of the plate portion 1a. Since the vibration generated in the ring gear portion 1b is attenuated by rubbing against the convex portion of the portion 24, the cranking sound can be reduced.

  As a modification of the third embodiment, as shown in FIG. 6, the inner peripheral portion of the ring gear portion 1b may have an uneven shape.

  Also in the third embodiment, the inner peripheral surface of the rim portion 24 or the ring gear portion 1b may be tapered as in the second embodiment.

  In the third embodiment, as shown in FIGS. 5 and 6, the concavo-convex shape is corrugated, but by deforming in the radial direction, the inner peripheral diameter of the ring gear part or the outer peripheral diameter of the plate part Any shape can be used as long as it can absorb the accuracy fluctuation.

  In the first to third embodiments, the case where the plate portion is pressed into the ring gear portion to provide a portion for attenuating vibration due to friction between the plate portion and the ring gear portion has been described. In addition, a friction material may be fixed to a corresponding portion between one of the welded portions of the ring gear portion and the welded portion by sticking or welding, and the plate portion and the ring gear portion may be assembled.

1 Drive Plate 1a Plate 1b Ring Gear 6 Welded 30 Press-fit

Claims (4)

A drive plate in which a peripheral portion of the plate portion and a ring gear meshing with the starter motor gear are welded by a plurality of weld portions,
The drive plate which provided the part which attenuates the vibration at the time of a starter motor meshing | engaging with the said ring gear by the friction with the said plate part and the said ring gear between the said weld parts.   The drive plate according to claim 1, wherein an outer peripheral diameter of the plate portion is made larger than an inner peripheral diameter of the ring gear, and the plate portion is press-fitted into the ring gear and then welded at the welded portion.   The drive plate according to claim 1 or 2, wherein an outer peripheral portion of the plate portion or an inner peripheral portion of the ring gear is tapered, and the plate portion is press-fitted into the ring gear and then welded by the welded portion.   The outer peripheral part of the said plate part or the inner peripheral part of the said ring gear is made into the uneven | corrugated shape which is easy to deform | transform into a radial direction, The said plate part is press-fitted in the said ring gear, and it welded by the said welding part. The drive plate according to 1.

Images