JPH07259925A - Device for reducing torsional vibration - Google Patents

Abstract

PURPOSE:To prevent generation of the noise such as the booming noise by eliminating the direct contact of a drive plate with a driven plate when the thrust works on the driven plate, and when the drive plate is tilted. CONSTITUTION:A driven plate 6 is interposed between drive plates 5a, 5b and the drive plates 5a, 5b are connected to the driven plate 6 in an elastic manner in the turning direction. A thrust ring 27 is interposed between the driven plate 6 and the inside margin part in the radial direction of one drive plate 5a. A thrust plate 28 is interposed between the driven plate 6 and the outside margin part in the radial direction of the other drive plate 5b. The thrust working on the driven plate 6 is supported through the thrust ring 27, and the tilting of the drive plates 5a, 5b is received through the thrust plate 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsional vibration reducing device used in a power transmission section between an engine of an automobile and a torque converter.

[0002]

2. Description of the Related Art As a torsional vibration reducing device of this type, a driven plate connected to a torque converter side is interposed between a pair of drive plates connected to an engine side, and a drive plate and a driven plate are provided. There is a structure in which a torsion spring is elastically coupled in the rotating direction to reduce the torsional vibration of the power transmission system by the vibration absorbing action of the torsion spring.

However, in this torsional vibration reducing device, since the drive plate and the driven plate are elastically coupled by the torsion spring, the thrust acting on the driven plate (thrust due to the increase in the internal pressure of the torque converter). .) Or the tilting of the drive plate due to the bending vibration of the crankshaft causes the drive plate and the driven plate to come into direct contact with each other, and the large friction generated at that time may cause noise such as muffled noise. Therefore, as a countermeasure to this,
Conventionally, a low-friction material is interposed between the driven plate and the edge portion of each drive plate in the radial direction to prevent friction due to direct contact between the drive plate and the driven plate.

It should be noted that this similar technique is disclosed in, for example, Japanese Utility Model Laid-Open No.
It is disclosed in Japanese Patent No. 144146.

[0005]

However, in the above-mentioned conventional torsional vibration reducing device, since the low friction material is interposed between the driven plate and the edge portions of the drive plates on the radially inner side, When a thrust force is applied to the driven plate, it is strong in strength through a low friction material (because it is directly connected to the crankshaft), but it will be reliably supported near the center of the drive plate. When the drive plate tilts due to bending vibration, the low friction material is placed near the center of the drive plate and driven plate, so the tilt of the drive plate cannot be sufficiently suppressed and the crankshaft bends. When the vibration becomes large, it is possible that the drive plate and the driven plate may come into direct contact with each other.

Therefore, the present invention reliably prevents direct contact between the drive plate and the driven plate when thrust is applied to the driven plate and when the drive plate tilts, and noise such as muffled noise is generated. The present invention seeks to provide a torsional vibration reduction device that does not have a torsional vibration.

[0007]

As a means for solving the above-mentioned problems, the present invention is connected to the torque converter side between a pair of drive plates whose inner edges in the radial direction are connected to the engine side. The driven plate is interposed, and both drive plates and the driven plate are elastically connected in the rotating direction, and a low friction material for preventing direct contact between the drive plate and the driven plate is provided. In the torsional vibration reduction device that is interposed, the first low-friction material is interposed between the driven plate and the radially inner edge of the drive plate near the engine, while the second low-friction material is The driven plate and the drive plate near the torque converter are interposed between the outer edges in the radial direction.

[0008]

When the thrust of the torque converter acts on the driven plate, the thrust is supported by the edge of the drive plate that is strong in strength in the radial direction through the first low friction material, and the driven plate acts on the drive plate. There is no direct contact.

Further, when the drive plate tilts due to bending vibration on the engine side, the tilting is received by both drive plates through the first low friction material and the second low friction material. At this time, since the second low-friction material is between the outer edges of the drive plate and the driven plate in the radial direction, it is possible to more reliably receive the tilt of the drive plate, and thus the drive plate directly contacts the driven plate. There is nothing to do.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS.

The drawing shows an example in which a torsional vibration reducing device 4 according to the present invention is used in a connecting portion between a crankshaft 1 of an engine and a converter cover 3 of a torque converter 2. Reference numerals 5a and 5b in FIG. The drive plate has an edge portion on the inner side in the direction connected to the end surface of the crankshaft 1, and 6 is a driven plate having an edge portion on the outer side in the radial direction connected to the end surface of the converter cover 3.

The drive plates 5a and 5b are formed into a substantially disc shape by press molding, and the radially inner edge portion thereof is joined to the crankshaft 1 by a bolt 7 in a superposed state, and the radially outer edge portion thereof. They are coupled by a stop pin 8 in a state where they are axially separated from each other by a predetermined distance.
A ring gear 9 meshed with a pinion (not shown) of the starter motor is welded to the outer peripheral end of the one drive plate 5a, and the radially inner edge of the other drive plate 5b is An annular retainer plate 10 and a spring material 11 such as a disc spring for urging the retainer plate 10 in the axial direction are attached. The retainer plate 10 has a plurality of claws 12 extending in the axial direction on the outer periphery thereof.
The claw 12 is inserted into a locking hole 13 formed in the other drive plate 5b so as to be movable in the axial direction, and thereby is locked to the drive plate 5b so as to be integrally rotatable.

On the other hand, the driven plate 6 is formed of a relatively thick plate material into a substantially disk shape, is disposed so as to be relatively rotatable between the drive plates 5a and 5b, and penetrates the drive plate 5b. Multiple bolts 1
It is joined to the end surface of the converter cover 3 by 4. At the outer edge of the driven plate 6 in the radial direction,
A stopper hole 15 into which the stop pin 8 is inserted is formed, and the contact between the stop pin 8 and the stopper hole 15 regulates the relative rotation angle of the drive plates 5a, 5b and the driven plate 6. . Also,
A plurality of windows 16 are formed in the driven plate 6 along the circumferential direction, and a pair of nested torsion springs 17, 17 are interposed in series in each of these windows 16. An annular idler 18 is interposed between the driven plate 6 and the drive plates 5a and 5b so as to be rotatable relative to the two, and a plurality of protrusions 19 formed on the idler 18 are provided. Is interposed between the torsion springs 17, 17 in each window 16 so that both torsion springs 17, 17 act in series along the circumferential direction.

A drive piece 20 is riveted to the one drive plate 5a so as to correspond to an end portion of each window 16 of the driven plate 6, and the other drive plate 5b is provided with each of the driven plates 6. Window 1
6 has a similar window 21 formed therein, and when the drive plates 5a, 5b and the driven plate 6 are assembled, the torsion spring 17,
The end of 17 contacts the drive piece 20 and the window 21. Therefore, the drive plate 5
The a and 5b and the driven plate 6 are elastically connected via a torsion spring 17 in the rotating direction.
A plurality of elongated holes 22 corresponding to the bolts 14 are formed in the drive plates 5a and 5b, and when the drive plates 5a and 5b and the driven plate 6 are relatively rotated, the heads of the bolts 14 and the converter cover 3 side. Screwing projection 2
3 does not interfere with the drive plates 5a and 5b.

Further, the driven plate 6 is formed with a plurality of elongated holes 24 along the circumferential direction, and the axial end faces of the elongated holes 24 are frictionally contacted with the drive plate 5a and the retainer plate 10. A friction block 25 having a high friction coefficient is loosely inserted so as to be movable in the circumferential direction. A cushioning member 26 such as a rubber material having two layers of a low-rigidity portion and a high-rigidity portion is attached to both ends of each long hole 24.
When the drive plates 5a and 5b and the driven plate 6 rotate relative to each other, the cushioning member 26 is pushed by the friction block 25 while being crushed by the friction block 25. Therefore, the friction block 25
Is a drive plate 5a, 5b and a driven plate 6
Drive relative to the set angle, drive plate 5a
Slides between the retainer plate 10 and the retainer plate 10 to generate a friction damping force.

By the way, a thrust ring 27 as a first low-friction material is interposed between the driven plate 6 and one of the drive plates 5a (close to the engine) on the inner side in the radial direction. A plurality of thrust plates 28 serving as a second low friction material are provided between the radially outer edges of the other drive plate 5b (close to the torque converter 2). Of these, the thrust ring 27 includes the driven plate 6 and the drive plate 5.
The thrust plate 28 is fitted on the radially outer edge of the drive plate 5b by latching pawls 28a so as to be evenly distributed in the circumferential direction, although it is slidable between both plates 6 and 5a. The flat surfaces 28b of the drive plates 5a and 5b are in sliding contact with the driven plate 6 when the drive plates 5a and 5b are tilted.

In the figure, 29 is a pump impeller integrally formed with the converter cover 3, 30 is a turbine hub spline-fitted to an output shaft (not shown), 31
Is a turbine runner connected to the turbine hub 30 at a position facing the pump impeller 29, and 32 is a lock-up piston that directly connects the converter cover 3 and the turbine hub 30 due to a change in hydraulic pressure in the converter cover 3.

Since the torsional vibration reducing device 4 is constructed as described above, the driving torque of the engine is that of the torque converter 2 from the crankshaft 1 through the drive plates 5a and 5b, the torsion spring 17, and the driven plate 6 in this order. It is transmitted to the converter cover 3. At this time, the torsional vibration of the power transmission system is reduced by the torsional vibration reduction device 4 as follows.

That is, while the relative rotation angle between the drive plates 5a, 5b and the driven plate 6 is smaller than the set angle, the torsional vibration is reduced by the vibration absorbing action of the torsion spring 17, and the drive plates 5a, 5b.
When the relative rotation angle between 5b and the driven plate 6 becomes a set angle or more, in addition to the vibration absorbing action of the torsion spring 17, the friction damping action due to the sliding of the friction block 25 works, and the torsional vibration is reduced by both actions. Will be done.

On the other hand, when the internal pressure of the torque converter 2 is increased during the operation of the engine, an axial thrust acts on the converter cover 3, and this thrust acts on the driven plate 6 via the bolts 14. The edge of the plate 6 on the radially inner side is pressed against the thrust ring 27, and at this time, the thrust is supported in the vicinity of the central portion of the drive plate 5a while causing sliding with the thrust ring 27. Therefore, at this time, drive plate 5
The driven plates 6 do not come into direct contact with a and 5b. Here, the drive plate 5a is formed of a relatively thin plate material, but the thrust is close to the joint with the crankshaft 1 and is strong in strength.
Since the driven plate 6 is supported in the vicinity of the center thereof, there is no fear that the drive plate 5a will be deformed even if a large thrust acts on the driven plate 6.

When the drive plates 5a and 5b are tilted back and forth in the axial direction due to bending vibration of the crankshaft 1, one drive plate 5a is in sliding contact with the thrust ring 27 and the other drive plate 5b is the thrust plate 28. The drive plate 5a, 5b is tilted by the driven plate 6 via the thrust ring 27 and the thrust plate 28. At this time, since the thrust plate 28 is interposed between the radially outer edges of the driven plate 6 and the drive plate 5b, the tilting of the drive plates 5a and 5b is ensured even when the tilting force is large. Therefore, the drive plates 5a and 5b and the driven plate 6 do not come into direct contact with each other.

The embodiments of the present invention are not limited to those described above. For example, in the embodiments shown in FIGS.
Although the plate-shaped thrust ring 27 is used, as shown in FIG. 3, a thrust ring 36 having a boss 35 is used,
The boss 35 may be fitted into the inner peripheral hole 6a of the driven plate 6 so as to prevent the driven plate 6 from being displaced in the radial direction. As shown in FIG. A thrust ball bearing 37 may be used, and an annular plate 38 that supports the thrust ball bearing 37 may be attached to the radially outer edge of the drive plate 5b.
As shown in FIG. 5, a thrust roller bearing 39 may be used as the second low friction material. Further, the thrust ball bearing 37 used as the second low friction material is shown in FIGS.
Alternatively, a simple structure in which a ball 40 that receives a thrust load is rotatably held by a resin plate 41 having a small friction coefficient may be used, as shown in FIG.

[0023]

As described above, according to the present invention, the first low-friction material is interposed between the driven plate and the edge of the drive plate near the engine on the radially inner side, while the second low-friction material is provided. Is interposed between the driven plate and the radially outer edge of the drive plate near the torque converter, and when the thrust of the torque converter acts on the driven plate, the thrust is passed through the first low-friction material for strength. The driven plate is supported by the inner edge of the driven plate in the radial direction, and when the drive plate tilts, the tilt is mainly received by the outer edge of the driven plate through the second low friction material. In either case, direct contact between the drive plate and the driven plate can be reliably prevented. Therefore, according to the present invention,
It is possible to reliably prevent the occurrence of muffled noise due to the direct contact between the drive plate and the driven plate.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 2 showing an embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing the same embodiment.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a sectional view showing another embodiment of the present invention.

FIG. 6 is a sectional view showing another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing the same embodiment.

[Explanation of symbols]

 2 ... Torque converter, 5a, 5b ... Drive plate, 6 ... Driven plate, 27 ... Thrust ring (first low friction material), 28 ... Thrust plate (second low friction material).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taku Murasugi 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (1)

[Claims] 1. A driven plate coupled to the torque converter side is interposed between a pair of drive plates whose radially inner edges are coupled to the engine side, and both drive plates and the driven plate rotate. In a torsional vibration reducing device, which is elastically connected in a direction, a low friction material is interposed between a drive plate and a driven plate to prevent direct contact between the two plates.
While interposing the low friction material of between between the driven plate and the inner edge of the drive plate near the engine in the radial direction,
A torsional vibration reduction device, wherein a second low friction material is interposed between the driven plate and a drive plate near the torque converter between the outer edges in the radial direction.