JPH09210132A - Damper mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease frictional resistance produced by sliding a bent leaf spring with an outer wall. SOLUTION: A flywheel assembly comprises a first flywheel, a second flywheel, and an arc chamber therebetween. A plurality of leaf springs 18 is plied and disposed in the arc chamber in a form of waves. A spring receiving sliders 30 comprises a pad 31 disposed between a plurality of bent leaf springs 18, and a sliding member 32 which supports outer ring 21 adjacent to the leaf spring 31 and slidably contacts to the outer wall of the arc chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper mechanism, and more particularly to a damper mechanism using a bent leaf spring.

[0002]

2. Description of the Related Art In a vehicle, for example, a damper mechanism is provided between a member on the engine side and a member on the transmission side to absorb fluctuations in engine torque. The damper mechanism is incorporated in a clutch disk assembly, a flywheel assembly, and the like. The damper mechanism includes an input-side member and an output-side member that can rotate relative to each other, a coil spring arranged to limit the rotation of both members when they rotate relative to each other, and friction or friction when both members rotate relative to each other. And a hysteresis torque generating mechanism that generates viscous resistance.

Such a damper mechanism requires a large space in the circumferential direction and the axial direction due to the structure of the coil spring constituting the damper mechanism. Therefore, it becomes difficult to incorporate the above-described damper mechanism into a front-wheel drive vehicle in which the space in the axial direction is particularly limited.
The damper mechanism disclosed in Japanese Patent Laid-Open No. 6-174011 uses a bent leaf spring instead of the coil spring, thus achieving space saving. The bent leaf spring is
It is a member formed by bending a plate member having a certain width into a wave shape. The bent leaf spring is arranged in an arcuate chamber formed by the input side member and the output side member, and transmits torque from the input side member to the output side member. When the torsional vibration is transmitted to the input side member, the bending leaf spring is compressed, and the fluid filled in the arcuate chamber flows between the bending leaf spring and the wall surface of the arcuate chamber to generate viscous resistance. To do. As a result, the torsional vibration is attenuated.

[0004]

Generally, in a damper mechanism, it is better to reduce the hysteresis torque caused by friction (or viscous resistance) for a small torsional vibration generated in a practical range of engine speed to reduce the vibration. effective. In the conventional damper mechanism using the bent leaf spring, as the bent leaf spring is compressed, the bent portion on the outer peripheral side of the bent leaf spring protrudes radially outward and slides on the outer peripheral wall of the arcuate chamber. The friction generated at this time increases as the twist angle increases. In particular, the friction is large because the entire bent leaf spring moves to the outer peripheral side due to the centrifugal force. Due to such friction, it is not possible to sufficiently damp small vibrations generated in the practical range of engine speed.

An object of the present invention is to reduce the frictional resistance caused by the sliding motion of the curved leaf spring and the outer peripheral wall.

[0006]

A damper mechanism according to a first aspect of the present invention includes a first rotating member, a second rotating member, a plurality of bent leaf springs, and a spring bearing slider. The second rotating member forms an arcuate chamber with the first rotating member. A plurality of bent leaf springs are arranged in the arcuate chamber and are bent in a wave shape. The spring bearing slider includes a spring bearing portion arranged between a plurality of curved leaf springs, and a sliding portion that supports an outer peripheral bent portion of the curved leaf spring that is adjacent thereto and that slidably abuts an outer peripheral wall of the arcuate chamber. Have.

When the torsional vibration is transmitted to the first rotary member, the first rotary member and the second rotary member periodically rotate relative to each other and are compressed in the circumferential direction of the plurality of bent leaf springs. The compressed leaf spring tries to push outward in the radial direction during compression, but the slider is in contact with the outer peripheral wall of the arcuate chamber, so that the curved leaf spring is unlikely to move radially outward. As a result, the friction generated between the bent leaf spring and the outer peripheral wall of the arcuate chamber is reduced. In particular, since the spring bearing slider is arranged between the two bent leaf springs, the contact area between the sliding portion and the outer peripheral wall of the arcuate chamber can be increased. As a result, the surface pressure is reduced and wear of the slider is reduced.

In the damper mechanism according to the second aspect, the sliding portion extends from the radially outer portion of the spring receiving portion to both sides in the circumferential direction, and supports the outer peripheral side bent portion of the adjacent bent leaf spring. In the damper mechanism according to the third aspect, the spring receiving portion supports the outer peripheral side bent portion and the inner peripheral side bent portion of the bent leaf spring. Therefore, the inner and outer peripheral portions of the plurality of bent leaf springs are uniformly compressed.

In the damper mechanism according to the fourth aspect, the arcuate chamber is filled with fluid, and the viscous resistance generating chamber is formed by the bent leaf spring, the wall of the arcuate chamber and the spring bearing slider. When the first rotating member and the second rotating member rotate relative to each other, the bent leaf spring is compressed in the circumferential direction, and the viscous resistance generating chamber is reduced. As a result, the fluid flows from the viscous resistance generation chamber to the outside, and viscous resistance is generated. Here, since the gap between the spring bearing slider and the outer peripheral wall of the arcuate chamber is long in the circumferential direction, the viscous resistance increases.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment FIGS. 1 to 3 show a flywheel assembly in which a damper mechanism according to a first embodiment of the present invention is adopted.
In FIG. 1, O-O is the axis of rotation of the flywheel assembly.

This flywheel assembly mainly comprises a first flywheel 1 fixed to a crankshaft (not shown) on the engine side, and a second flywheel rotatably supported by the first flywheel 1 via a bearing 2. It has a wheel 3 and a bent leaf spring 18 consisting of a plurality of split bent leaf springs 18a, 18b, 18c arranged between both flywheels.

The first flywheel 1 is arranged so as to face the input plate 6 and a disc-shaped input plate 6 disposed on a side face of the hub 5 on the engine side. The counter plate 7 and the annular first flywheel body 8 fixed to the outer peripheral portion of the input plate 6. The hub 5 and the input plate 6 are fixed to a crankshaft (not shown) by bolts 9 and washer plates 10. The inner race of the bearing 2 is fixed to the outer periphery of the hub 5. An outer peripheral tubular portion 7a extending toward the engine is formed on the outer periphery of the facing plate 7, and the outer peripheral tubular portion 7a is formed by the first flywheel main body 8
Of the input plate 6 and the inner peripheral portion of the first flywheel body 8 are welded to the outer peripheral portion of the input plate 6. A ring gear 11 is fixed to the outer periphery of the first flywheel body 8.

The second flywheel 3 includes an output plate 1
2, an annular second flywheel main body 13, and a disk-shaped intermediate plate 14 disposed between the output plate 12 and the second flywheel main body 13.
These are connected by a plurality of rivets 15. The output plate 12 includes a tubular portion 12a that abuts the outer peripheral surface of the outer race of the bearing 2, an annular portion 12b that extends inward from the engine-side tip of the bearing portion 2 and abuts the engine-side end surface of the outer race of the bearing 2, and a tubular portion. It is composed of a mounting flange portion 12c extending from the transmission side end of 12a to the outer peripheral side and to which the rivet 15 is fixed. And FIG.
As shown in enlarged form, a seal member 16 is arranged between the outer peripheral portion of the mounting flange portion 12c and the inner peripheral portion of the counter plate 7 to seal the both. The inner peripheral portion of the intermediate plate 14 is in contact with the transmission-side end surface of the outer race of the bearing 2.

A clutch disc 4 can be frictionally engaged with the second flywheel body 13. The input plate 6, the counter plate 7, and the output plate 12 described above form an annular chamber 17. A viscous fluid such as grease is housed inside the annular chamber 17. Further, as shown in FIG. 1, the outer peripheral portion of the counter plate 7 is formed with locking portions 7b projecting toward the inner peripheral side at two locations facing each other in the radial direction. Further, on the outer peripheral portion of the cylindrical portion 12a of the output plate 12, two locking portions 12d projecting toward the outer peripheral side are formed facing the locking portion 7b. These locking parts 7
The annular chamber 17 is divided by b and 12d into a pair of semicircular arcuate chambers. The viscous fluid can flow between the two arcuate chambers 17. The plurality of bent leaf springs 18 are
It is arranged in each of the arcuate chambers.

The bent leaf spring 18 arranged in the arcuate chamber will be described in detail with reference to FIGS. 3 and 4. As shown in the figure, the bending leaf spring 18 includes three divided bending leaf springs 18.
a, 18b, 18c. Split bending leaf spring 18a
Spring receiving sliders 30 are respectively arranged between and 18b and between 18b and 18c.

Each of the bent leaf springs 18a, 18b, 18c extends in a state in which a leaf member having a predetermined width is bent in a wavy shape, and a plurality of spring elements including ring portions 21 and 22 and a lever portion 23 are connected in series. It is connected to.
The outer peripheral side ring portion 21 and the inner peripheral side ring portion 22 are arranged in a zigzag shape, and opposite sides have end portions 21a and 22a, respectively. The end portions 21a and 22a each have a small gap in the circumferential direction. The respective end portions 21a and 22a are connected to the end portions of the opposing ring portions by a lever portion 23. When viewed from the ring portions 21, 22 side, the lever portion 23 extends so as to open to both sides. Both ring parts 21, 22 are
It has a variable cross section in which the thickness gradually decreases from the end portions 21a, 22a toward the central portion, and the rigidity is lower than that of the lever portion 23. The outer peripheral side ring portion 21 has a larger diameter than the inner peripheral side ring portion 22. Split bent leaf springs 18a, 18b, 18c
Both ends of the lever have a lever portion 23 that is half the length of the others.

Split bent leaf springs 18a, 18b, 18c
Is approximately equal to the width of the annular chamber 17, and the radial length is shorter than the length of the annular chamber 17. The spring bearing slider 30 is
It is composed of a spring receiving portion 31 and a sliding portion 32. The spring receiving portion 31 has substantially the same radial length as the annular chamber 17.
The side walls on both sides in the circumferential direction of the spring receiving portion 31 are curved inward at the middle portion in the radial direction. The inner peripheral side of the spring receiving portion 31 is in contact with the inner peripheral side ring portions 22 on both sides. Spring receiving part 31
The outer peripheral side of the outer peripheral side is the outer peripheral side ring portion 21 and both end portions 2 thereof.
It abuts on the tip of the lever portion 23 having a half length extending from 1a. In this way, the spring receiving portion 31 is connected to the outer ring portion 2
1 and the inner ring portion 22 are in contact with each other, the bent leaf spring 18 is uniformly compressed on the inner and outer circumferences. The sliding portion 32 extends in the axial direction from the outer peripheral portion of the spring receiving portion 31. The outer peripheral side of the sliding portion 32 is configured to be slidable in the circumferential direction on the outer peripheral tubular portion 7a of the arcuate chamber. The sliding portion 32 immovably supports the outer peripheral portions of the outer peripheral ring portions 21 on both sides in the circumferential direction.

Since the spring bearing slider 30 is arranged between the curved leaf spring 18 and the outer peripheral tubular portion 7a in this manner, the outer peripheral tubular portion 7a and the outer peripheral ring portion 21 of the curved leaf spring 18 are arranged between them. A gap S ₁ is secured in the space. As a result, it is difficult for the outer peripheral side ring portion 21 to slide on the outer peripheral tubular portion 7a when the bending leaf spring 18 is compressed. The outer peripheral tubular portion 7a is coated with Teflon, and the slider 30 uses a member having a small friction coefficient with the outer peripheral tubular portion 7a. As a result, less friction occurs between the outer peripheral tubular portion 7a and the spring bearing slider 30.

In each arcuate chamber, a spring bearing slider 30,
The viscous resistance generating chamber 1 is formed by the outer peripheral tubular portion 7a, the split bending leaf spring 18b, the input plate 6 and the side wall of the counter plate 7.
7A are formed. That is, the viscous resistance generation chamber 17
A is a space radially sandwiched between the split bending leaf spring 18b and the outer peripheral tubular portion 7a, and axially sandwiched between the input plate 6 and the counter plate 7, and two spring receiving sliders in the circumferential direction. It is closed by 30.

The outer peripheral ring portions 21 at both ends in the circumferential direction of the split bent leaf springs 18a and 18c abut on the engaging portion 7b, and the inner ring portions 22 at both ends in the circumferential direction engage the engaging portion 12d.
Is in contact with Next, the operation will be described. The torque transmitted from the crankshaft on the engine side to the first flywheel 1 is transmitted to the bending leaf spring 18 via the engagement portion 7b of the input plate 6 and the counter plate 7, and further from the bending leaf spring 18 to the output plate 12. Locking part 12
It is transmitted to the second flywheel 3 via d.

When a torsional vibration is input to the flywheel assembly, the first flywheel 1 and the second flywheel 3 cyclically rotate relative to each other, and the bending leaf spring 18 is compressed in the circumferential direction. It Then, the opening angle of each lever portion 23 becomes small, and the ring portions 21 and 2 of the bent leaf spring 18 are made.
The ring portions 21 and 22 and the lever portion 23 bend in the same direction with the outer peripheral portion of 2 as a fulcrum. At this time, the torsional rigidity is low.

As the relative angle increases, the ring portion 21,
The end portions 21a and 22a of 22 contact with each other, and thereafter, the ring portions 21 and 22 are flexibly deformed with the end portions 21a and 22a as fulcrums. At this time, the torsional rigidity is high. When the first flywheel 1 and the second flywheel 3 rotate relative to each other, the viscous resistance generation chamber 17A is compressed, and the fluid flows from there between the bent leaf spring 18 and the side walls of the plates 6 and 7 and the spring bearing slider 30. It flows through between the outer peripheral tubular portion 7a. At this time, viscous resistance is generated, and the torsional vibration is damped. In particular, since the spring bearing slider 30 extends in the circumferential direction and the gap between the spring bearing slider 30 and the outer peripheral tubular portion 7a is long in the circumferential direction, a larger viscous resistance is generated.

When the bending leaf spring 18 is compressed, the respective elements tend to push outward in the radial direction. Further, the entire bent leaf spring 18 tends to move radially outward due to the centrifugal force. However, since the bending leaf spring 18 is restricted from moving by the spring receiving slider 30, it is difficult for the bending leaf spring 18 to come into contact with or slide on the outer peripheral tubular portion 7a. for that reason,
Friction between the two is reduced. As a result, the minute vibrations generated in the engine engine speed range are sufficiently damped with the characteristics of low rigidity and low resistance.

Further, since the spring bearing slider 30 is arranged between the divided bent leaf springs 18a, 18b, 18c, the sliding area with the outer peripheral tubular portion 7a is increased. As a result, the surface pressure is reduced and wear of the spring bearing slider 30 is reduced. Further, the coefficient of friction between the slider 30 and the outer peripheral tubular portion 7a becomes stable. By dividing the bent leaf spring into three divided bent leaf springs 18a, 18b, 18c, the divided bent leaf springs 18a, 18b, 18c having different shapes and characteristics are used to optimize the overall characteristics. it can.

The damper mechanism may be used in devices other than the flywheel assembly. For example, it can be adopted in a lockup device for a clutch disc assembly or a torque converter. The shape, structure, and number of divisions of the bent leaf spring 18 are not limited to those in the above embodiment. In addition, the spring receiving slider 30
The shape, structure, and number of are not limited to those in the above embodiment.

[0026]

In the damper mechanism according to the present invention, when a plurality of bent leaf springs are compressed in the circumferential direction, they tend to push outward in the radial direction, but the slider is in contact with the outer peripheral wall of the arcuate chamber. Therefore, it is difficult for the bent leaf spring to move radially outward. As a result, the friction generated between the bent leaf spring and the outer peripheral wall of the arcuate chamber is reduced. In particular, since the spring bearing slider is arranged between the two bent leaf springs, the contact area between the sliding portion and the outer peripheral wall of the arcuate chamber can be increased. As a result, the surface pressure is reduced and wear of the slider is reduced.

When the spring receiving portion supports the outer peripheral side bent portion and the inner peripheral side bent portion of the bent leaf spring, the inner and outer circumference portions of the plurality of bent leaf springs are uniformly compressed. When the viscous resistance generating chamber is formed, the gap between the spring bearing slider and the outer peripheral wall of the arcuate chamber becomes long in the circumferential direction, and the viscous resistance increases.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a flywheel assembly that employs an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1;

FIG. 3 is a schematic front view of a bent leaf spring arranged in an arcuate chamber.

FIG. 4 is a partially enlarged view of FIG. 3;

[Explanation of Codes] 1 First flywheel 3 Second flywheel 6 Input plate 7 Opposing plate 7a Outer peripheral tubular portion 17 Annular chamber 17A Viscous resistance generating chamber 18 Bending leaf spring 21 Outer peripheral side ring portion 22 Inner peripheral side ring portion 23 Lever part 30 Spring receiving slider 31 Spring receiving part 32 Sliding part

Claims (4)

[Claims] 1. A first rotating member, a second rotating member forming an arcuate chamber between the first rotating member, and a plurality of bent leaf springs arranged in the arcuate chamber and bent in a wave shape. A spring receiving portion arranged between the plurality of bent leaf springs,
A damper mechanism, comprising: a spring bearing slider having a sliding portion that supports an adjacent outer peripheral bent portion of the bent leaf spring and that slidably abuts on an outer peripheral wall of the arcuate chamber. 2. The damper mechanism according to claim 1, wherein the sliding portion extends from the radially outer portion of the spring receiving portion to both sides in the circumferential direction and supports an outer peripheral side bent portion of an adjacent bent leaf spring. . 3. The damper mechanism according to claim 1, wherein the spring receiving portion supports an outer peripheral side bent portion and an inner peripheral side bent portion of the bent leaf spring. 4. A fluid is filled in the arc chamber,
4. The damper mechanism according to claim 1, wherein the viscous resistance generating chamber is formed by the curved leaf spring, the wall of the arcuate chamber, and the spring bearing slider.