JP2001132817A - Damping structure of drive plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the damping structure of a drive plate which can attenuate a cranking sound effectively. SOLUTION: In a drive plate 1, provided a ring gear 1b meshed with a starter motor gear on its outer periphery, for connecting the crank shaft 10 of an engine with a torque converter 20, a damper 6 is arranged between the drive plate 1 and the torque converter 20 and on the intermediate position of the nearly circumferential direction of the bolt tightened part 22 to the torque converter 20 of the drive plate 1. The membrane vibration produced at the cranking time is attenuated and the cranking sound is restrained by the damper 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping structure for a drive plate, and more particularly to a structure for suppressing film vibration of a drive plate which occurs during cranking.

[0002]

2. Description of the Related Art Conventionally, a drive plate has been used to transmit a driving force of an engine to a torque converter of an automatic transmission. That is, the inner diameter portion of the drive plate is bolted to the engine crankshaft, and the outer diameter portion is bolted to the torque converter. And
A ring gear meshing with the starter motor gear is provided on the outer periphery of the drive plate.

The drive plate includes a two-piece drive plate and a one-piece drive plate. 2
The piece-type drive plate has a structure in which a ring gear is welded to an outer peripheral portion of a press-formed plate. In a one-piece type drive plate, a plate portion and a ring gear portion are integrally formed. The one-piece drive plate has a smaller number of parts than the two-piece drive plate, and thus has the advantage of reducing manufacturing costs.

[0004]

When the engine is started (cranking), a ring gear is driven by a starter motor to rotate the drive plate. However, a film vibration is generated by a torque applied to the drive plate at the time of cranking. Therefore, there is a problem that the cranking sound reverberates. This cranking sound is generally
The one-piece drive plate is larger than the two-piece drive plate.

It is an object of the present invention to provide a drive plate damping structure capable of effectively attenuating cranking noise.

[0006]

According to a first aspect of the present invention, a ring gear is provided for connecting a crankshaft of an engine to a torque converter, and a ring gear meshing with a starter motor gear is provided on an outer peripheral portion. In the drive plate, a cushioning member is disposed between the drive plate and the torque converter and substantially at an intermediate position in a circumferential direction of a connection portion between the drive plate and the torque converter. Provide vibration structure.

[0007] In the case of the first aspect of the present invention, the connecting portion of the drive plate with the torque converter (for example, a bolted portion) does not vibrate because the movement is restricted by the torque converter, but it is substantially circumferential. At the intermediate position in the direction, the membrane vibration is most likely to occur, and a cranking sound is easily generated. Therefore, by arranging cushioning material in this part,
The film vibration of the drive plate generated at the time of cranking can be attenuated, and the reverberation of the cranking sound can be suppressed. As the cushioning material, for example, a rubber-like elastic body can be used. The drive plate and the torque converter may be connected by rivets or the like in addition to fastening by bolts.

According to a second aspect of the present invention, there is provided a drive plate for connecting a crankshaft of an engine and a torque converter, and having a ring gear meshing with a starter motor gear on an outer peripheral portion. A slit in a direction substantially perpendicular to the normal direction of the connecting portion of the drive plate, and the opposing slit surfaces are slidable with each other. provide.

According to a second aspect of the present invention, a film is not attenuated by the cushioning material, but a slit is formed in the drive plate. By sliding the slit surfaces in contact with each other, the film vibration is attenuated by the frictional resistance. In this case,
Since a separate component such as a cushioning material is not required, the structure is simplified and the cost can be reduced.

[0010] In the case of the second aspect of the invention, if the membrane vibration is frequently applied, a crack may be generated at the end of the slit due to shear stress. It is desirable to form stress relief holes at both ends. In this case, cracks can be prevented from being generated at the ends of the slits, and the opposing surfaces of the slits are easily moved, so that there is an advantage that the damping effect is increased.

The present invention is applicable to both one-piece drive plates and two-piece drive plates. In particular, in the case of a one-piece drive plate, since there is no welded portion, there is a property that the film vibration of the drive plate generated at the time of cranking is hardly attenuated. However, by applying the present invention, the film vibration is effectively reduced. Can be suppressed.

[0012]

1 to 3 show a first embodiment of a drive plate vibration damping structure according to the present invention. The drive plate 1 of this embodiment is a one-piece drive plate, and includes a plate portion 1a and a ring gear portion 1b integrally formed on the outer periphery thereof. Plate part 1a
A plurality of (six in this embodiment) crankshaft mounting holes 2 for fastening to a crankshaft 10 of an engine with bolts 11 are formed in an inner diameter portion thereof, and a nut portion 21 of a torque converter 20 is formed in an outer peripheral portion. A suitable number of torque converter mounting holes 3 for fastening with bolts 22 (in this embodiment, one
Three at 20 ° intervals). A suitable number (six in this embodiment) of a plurality of rigidity adjusting holes 4 are formed in a substantially intermediate portion of the torque converter mounting hole 3 in the circumferential direction, so that the drive plate 1 has flexibility. Grant,
When the torque converter 20 repeatedly expands and contracts due to a change in internal pressure, it can follow the axial deformation of the torque converter 20.

An appropriate number (three in this embodiment, three at 120 ° intervals) of buffer material mounting holes 5 are formed in the plate portion 1a of the drive plate 1 at circumferentially intermediate positions of the torque converter mounting holes 3. As shown in FIG. 3, a head 6a of a cushioning material 6 made of elastic rubber is inserted into this mounting hole 5 to prevent it from falling off. The body 6b of the cushioning member 6 is sandwiched between the drive plate 1 and the torque converter 20, and is bent from the two-dot chain line state to the solid line state by fastening the bolt 22, thereby damping the membrane vibration of the drive plate 1. It has become.

When the engine is started, the ring gear 1b is driven by the starter motor to rotate the drive plate 1, but a torque applied to the drive plate 1 generates a film vibration, and a cranking sound is generated due to the film vibration. . In particular, the portion between the bolted portions vibrates most. However, since the cushioning member 6 is disposed between the portion of the drive plate 1 having the largest amplitude and the torque converter 20, the film vibration is attenuated by the cushioning member 6, and the cranking noise can be suppressed.

FIGS. 4 and 5 show a second embodiment of the drive plate vibration damping structure according to the present invention. The drive plate 1 of this embodiment is also a one-piece drive plate,
The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. In this embodiment, to attenuate the membrane vibration,
Instead of attaching the cushioning material 6 to the drive plate 1, an appropriate number of slits 7 (three at intervals of 120 ° in this embodiment) are formed at intermediate positions in the circumferential direction of the torque converter mounting hole 3 in the drive plate 1. Shearing is performed in a direction perpendicular to the line direction so that the opposing slit surfaces 7a can slide on each other. Stress relaxation holes 8 are formed at both ends of the slit 7 in the length direction to prevent cracks at both ends of the slit 7. In this embodiment, the slit 7 is linear, but may be curved in the circumferential direction.

In this embodiment, when the film 7 of the drive plate 1 generated at the time of cranking causes the slit 7 to be interposed and the portions on both sides thereof to be relatively displaced, the slit surface 7
By making the a slidingly contact each other, the film vibration can be attenuated by the frictional resistance. The sliding direction of the slit surface 7a can be considered to be both the circumferential direction and the plate thickness direction depending on the form of the film vibration. In either case, the effect of suppressing the cranking noise is obtained. Further, by forming the stress relaxation holes 8 at both ends of the slit 7, cracks can be prevented from being generated at both ends of the slit 7, and the slit surface 7a is easily displaced, so that the film vibration can be more effectively attenuated. Can be.

In the first and second embodiments, the cushioning material 6 and the slit 7 are mounted or formed on substantially the same circumference as the torque converter mounting hole 3. However, the number is not limited to three. In any case, it is desirable to provide the drive plate at a position where the amplitude of the membrane vibration is largest.

[0018]

As is apparent from the above description, claim 1
According to the invention described in (1), since the cushioning member is arranged between the drive plate and the torque converter and substantially at the intermediate position in the circumferential direction of the connection portion of the drive plate with the torque converter, the drive generated at the time of cranking The membrane vibration of the plate can be attenuated by the buffer material, and the reverberation of the cranking sound can be suppressed. According to the second aspect of the present invention, the slit is formed at a substantially middle position in the circumferential direction of the connecting portion of the drive plate with the torque converter, the slit is formed in a direction perpendicular to the normal direction, and the slit surface facing the slit surface is formed. Are slidable with each other, the film vibration generated during cranking can be attenuated by the frictional resistance of the slit surface, and the reverberation of the cranking sound can be suppressed.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment of a drive plate vibration damping structure according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of a portion B in FIG. 2;

FIG. 4 is a front view of a second embodiment of the drive plate vibration damping structure according to the present invention.

FIG. 5 is an enlarged view of a portion C in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive plate 1a Plate part 1b Ring gear part 2 Crankshaft mounting hole 3 Torque converter mounting hole 5 Buffer material mounting hole 6 Buffer material 7 Slit 7a Slit surface 8 Stress relief hole 10 Crankshaft 20 Torque converter

Claims (3)

[Claims] 1. A drive plate which connects a crankshaft of an engine and a torque converter, and has a ring gear provided on an outer peripheral portion thereof for meshing with a starter motor gear, the drive plate being provided between the drive plate and the torque converter,
A damping structure for a drive plate, wherein a cushioning material is disposed at a substantially middle position in a circumferential direction of a connection portion of the drive plate with the torque converter. 2. A drive plate which connects a crankshaft of an engine to a torque converter and has a ring gear provided on an outer peripheral portion thereof for meshing with a starter motor gear. A drive plate vibration damping structure, characterized in that a slit is formed at a position and in a direction perpendicular to the normal direction of the slit, and opposing slit surfaces can slide on each other. 3. The vibration damping structure for a drive plate according to claim 2, wherein stress relaxation holes are formed at both ends in the length direction of said slit.