JPH08291827A - Damper mechanism - Google Patents

Abstract

PURPOSE: To lower the rigidity and enlarge the twist angle in a damper mechanism using bent leaf springs. CONSTITUTION: A fly wheel assembly comprises a first fly wheel, a second fly wheel, a first bent leaf spring 31, a second bent leaf spring 32, and a coupling member 33. The second bent leaf spring 32 is arranged in the side of the first bent leaf spring 31. The coupling member 33 is provided with an arc plate part extending between the first bent leaf spring 31 and the second bent leaf spring 32, a first abutment 34 which extends from the rotation reverse side end of the arc plate part and abuts on the circumferential outside of the rotation reverse side end of the first bent leaf spring, and a second abutment 35 which extends from the rotation side end of the arc plate part and abuts on the circumferential outside of the rotation side end of the second bent leaf spring 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper mechanism which employs a bent leaf spring.

[0002]

2. Description of the Related Art Generally, in a damper disk assembly, an input side member capable of inputting torque from the engine side and an output side member for transmitting torque to an output side shaft are elastically elastic in a rotational direction by elastic members. It is connected. That is, the elastic member is arranged between the input-side member and the output-side member, and is compressed while hindering relative rotation of both members when they rotate relative to each other. When a torsional vibration is input to the damper disk assembly from the engine side, the elastic member repeatedly expands and contracts in the circumferential direction to absorb the torsional vibration. A coil spring is usually used as the elastic member, but a bent leaf spring is used in the damper disk assembly disclosed in Japanese Patent Laid-Open No. 6-137341. Since the bending leaf spring has a large elastic energy in a unit volume, the width dimension of the spring can be reduced while sufficiently securing the torque transmission capacity. In addition, the bent leaf spring provides low stiffness and a wide twist angle.

[0003]

In the above-mentioned conventional damper disk assembly, the rigidity of the bent leaf spring is not sufficiently low, and the twist angle is not sufficiently wide.
Therefore, the torsional vibration may not be attenuated. An object of the present invention is to reduce the rigidity and widen the twist angle in a damper mechanism that uses a bent leaf spring.

[0004]

A damper mechanism according to a first aspect of the present invention includes a first rotating member, a second rotating member, a first bent leaf spring, a second bent leaf spring, and a connecting member. Second
The rotating member forms an arcuate chamber with the first rotating member. The first bent leaf spring is arranged in the arcuate chamber, and one circumferential direction outer side of one end in the rotation direction contacts the first rotation member. The second bent leaf spring is arranged laterally of the first bent leaf spring in the arcuate chamber,
The other end in the circumferential direction of the other end in the rotation direction comes into contact with the second rotation member. The connecting member has an arc-shaped plate portion, a first contact portion, and a second contact portion. The arcuate plate portion extends between the first bent leaf spring and the second bent leaf spring. The first contact portion extends from the other end of the arc-shaped plate portion in the rotational direction and abuts on the outer side in the circumferential direction of the other end of the first curved plate spring in the rotational direction. The second contact portion extends from one end of the arc-shaped plate portion in the rotational direction and abuts on the outer side in the circumferential direction of one end of the second curved plate spring in the rotational direction.

A damper mechanism according to a second aspect of the present invention includes a first rotating member, a second rotating member, a pair of first bent leaf springs, a pair of second bent leaf springs, and a pair of connecting members. There is.
The second rotating member forms a pair of arcuate chambers with the second rotating member. The pair of first bent leaf springs are respectively arranged in the pair of arcuate chambers, and one circumferential direction outer side of one end in the rotation direction contacts the first rotation member. The pair of second bent leaf springs are respectively arranged laterally of the first bent leaf springs in the arcuate chamber, and the circumferential outer side of the other end in the rotation direction abuts the first rotation member. Each of the pair of connecting members has an arc-shaped plate portion, a first contact portion, and a second contact portion. The arcuate plate portion extends between the first bent leaf spring and the second bent leaf spring. The first contact portion extends from the other end of the arc-shaped plate portion in the rotational direction and abuts on the outer side in the circumferential direction of the other end of the first curved plate spring in the rotational direction. The second contact portion extends from one end of the arc-shaped plate portion in the rotational direction and abuts on the outer side in the circumferential direction of one end of the second curved plate spring in the rotational direction.

In the damper mechanism of the third aspect, the pair of connecting members are connected to each other so as to rotate integrally.

[0007]

In the damper mechanism according to the first aspect, when the first rotating member rotates, the torque is transmitted to the second rotating member via the first bending leaf spring, the connecting member and the second bending leaf spring. . When the torsional vibration is transmitted to the first rotating member,
The first rotating member and the second rotating member rotate relative to each other through the first bent leaf spring, the connecting member, and the second bent leaf spring.
At this time, the first bent leaf spring and the second bent leaf spring repeatedly expand and contract in the circumferential direction. Here, since the first bent leaf spring and the second bent leaf spring are connected in series in the circumferential direction, the rigidity is reduced and the twist angle is widened, and the torsional vibration damping characteristics are improved. To do.

According to the damper mechanism of the second aspect, the first
When the rotating member rotates, the torque is transmitted to the second rotating member via the pair of first bending leaf springs, the pair of connecting members, and the pair of second bending leaf springs. When the torsional vibration is input to the first rotating member, the first rotating member moves the first rotating member through the pair of first bending leaf springs, the pair of second bending leaf springs, and the pair of connecting members. It rotates relative to the two rotating members. At this time,
The first bent leaf spring and the second bent leaf spring repeatedly expand and contract in the circumferential direction. Here, since the first bending leaf spring and the second bending leaf spring are connected in series in each arcuate chamber, the rigidity is reduced and the twisting angle is widened, and the torsional vibration damping characteristic is improved. .

In the damper mechanism according to the third aspect of the present invention, since the pair of connecting members are connected to each other so as to rotate integrally, centrifugal forces acting on each other are balanced, and the outward movement in the radial direction is restricted. ing. As a result, the connecting member is less likely to frictionally slide on the outer peripheral wall of the arcuate chamber or the like, and unnecessary frictional resistance is unlikely to occur.

[0010]

1 and 2 show a flywheel assembly for a vehicle which employs a damper mechanism according to an embodiment of the present invention. In FIG. 1, OO is the rotation axis of the flywheel assembly, and in FIG. 2, the R ₁ direction is the rotation direction of the flywheel assembly. Although not shown in FIG.
The engine is located to the left of the, and the clutch disc and transmission are located to the right.

This flywheel assembly is mainly rotatably supported by a first flywheel 1 via a bearing 2 and a first flywheel 1 fixed to a crankshaft (not shown) on the engine side. 2nd flywheel 3
And first and second curved leaf springs 31 and 32 for transmitting torque between both flywheels. The first flywheel 1 includes a hub 5 arranged in the center and a hub 5
Disk-shaped input plate 6 arranged on the side surface on the engine side, a disk-shaped counter plate 7 arranged so as to face the input plate 6, and an annular shape fixed to the outer peripheral portions of the plates 6 and 7. And the first flywheel body 8 of FIG. The inner peripheral portions of the hub 5 and the input plate 6 are fixed to a crankshaft (not shown) by bolts 9 and washer plates 10. The outer peripheral portion of the opposed plate 7 is an outer peripheral tubular portion 7a protruding toward the engine side. The outer peripheral tubular portion 7a is inserted into the inner peripheral portion of the first flywheel body 8, and the tip end thereof is the outer peripheral portion of the input plate 6. And is welded to the inner circumference of the first flywheel body 8. 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 disc-shaped intermediate plate 14 arranged between the output plate 12 and the second flywheel main body 13,
These members are connected to each other by a plurality of rivets 15. The output plate 12 is composed of an inner peripheral side supporting portion 12a supported by the bearing 2 and a mounting flange portion 12b extending from the supporting portion 12a to the outer peripheral side. The support portion 12a is in contact with the engine-side surface and the outer peripheral surface of the bearing 2. Outer peripheral portion of the mounting flange portion 12b and the facing plate 7
A seal member (not shown) for sealing the both is disposed between the inner peripheral portion and the inner peripheral portion. The inner peripheral portion of the intermediate plate 14 is in contact with the surface of the bearing 2 on the transmission side. The second flywheel body 13 has a friction surface 13a on which the friction facing 4 of the clutch disc can be frictionally engaged.
Are formed.

The annular fluid chamber 17 is formed by the input plate 6, the counter plate 7 and the output plate 12 described above.
Is configured. A viscous fluid such as grease is stored in the fluid chamber 17. Further, on the outer peripheral portion of the support portion 12a of the output plate 12, the locking portion 1 protruding toward the outer peripheral side
2c is formed. Further, a locking portion 12d that protrudes toward the outer peripheral side is formed at a position that faces the locking portion 12c in the radial direction. The locking portion 12c is arranged on the transmission side in the fluid chamber 17, and the locking portion 12d is arranged on the engine side. The locking portion 1 is attached to the outer peripheral tubular portion 7a.
A locking portion 7b protruding inward is formed at a position corresponding to 2c. Further, on the outer peripheral portion of the input plate 6, a locking portion 6a protruding toward the fluid chamber 17 side is formed at a position facing the locking portion 12d in the radial direction. The locking portion 7b is arranged on the transmission side in the fluid chamber 17, and the locking portion 6a is arranged on the engine side. With such a configuration, the annular fluid chamber is divided into a pair of arcuate chambers. The viscous fluid can move back and forth between the pair of arcuate chambers. The first and second bent leaf springs 31, 32 are arranged in this arcuate chamber.

The first bent leaf spring 31, the second bent leaf spring 32 and the connecting member 33 are paired, respectively.
It is arranged separately in a pair of arcuate chambers. Here, only the configuration inside one arcuate chamber will be described in detail. FIG.
As shown in FIG. 3, the first and second bent leaf springs 31 and 32 are configured by bending a plate member having a constant width into a wavy shape. To be more specific, a plurality of ring portions 20 and a lever portion 21 are provided. The spring elements are connected in series.

The plurality of ring portions 20 are annular bodies having substantially the same diameter, and a predetermined gap S ₁ is secured between adjacent ring portions 20 in a free state. The inside of the ring portion 20 is an open ring portion 23, and the open ring portion 23 has a gap S ₂ in the free state and the set state.
Lever portions 21 extend outward from both sides of each. The lever portions 21 extend so as to widen their distances toward the outside, and are continuous with one of the lever portions 21 of the opposing ring portions 20.

Width of the first and second bent leaf springs 31, 32
Is less than half of the fluid chamber 17, and the radial length is
Shorter than chamber 17 length. The first bending plate is in each arc chamber.
The spring 31 and the second bent leaf spring 32 are arranged side by side in the axial direction.
Is placed. First bent leaf spring 31 and second bent leaf spring
A connecting member 33 is arranged between the ridge 32 and the ridge 32. Communicating
The body portion of the binding member 33 extends in the circumferential direction, and
Prevents contact between the leaf spring 31 and the second bent leaf spring 32
are doing. As shown in detail in FIG.
₂A first contact portion 34 is formed on the side. First contact part
34 is a lock extending from the main body to the transmission side
R from the tip of the locking portion 34a and the locking portion 34a ₁Bend to the side
Both of the bent portion 34b and the locking portion 34a in the radial direction
And a support portion 34c formed on the. This first hit
R of the first bent leaf spring 31 is attached to the contact portion 34.₂The side edge is locked
Have been. Specifically, R of the first bent leaf spring 31₂~ side
The end portion is in contact with the locking portion 34a, and the bent portion 34b
The axial movement is restricted by the support portion 34c.
Therefore, the movement in the radial direction is restricted. Of the connecting member 33
R₁A second contact portion 35 similar to the first contact portion 34 is provided on the side end portion.
Are formed. The second contact portion 35 has a second bending plate.
Ne 32 R₁The side end is locked. Second contact portion 35
Is bent in the same manner as the first contact portion 34 with the locking portion 35a.
It has a portion 35b and a support portion 35c.

At the end of the first bent leaf spring 31 on the R ₁ side,
The locking portion 12c is in contact with the inner peripheral side and the locking portion 7b is in contact with the outer peripheral side. At the end of the second bent leaf spring 32 on the R ₂ side, the engaging portion 12 d abuts on the inner peripheral side and the engaging portion 6 on the outer peripheral side.
a is in contact. Also in the other arcuate chamber, the first bent leaf spring 31, the second bent leaf spring 32, and the connecting member 33.
However, they are arranged so as to be line-symmetrical to the above-mentioned configuration in the arcuate chamber. That is, the first contact portions 34 are close to each other, and the contact portions 35 are close to each other on the opposite side.

Next, the operation will be described. The torque input to the first flywheel 1 from the crankshaft on the engine side is transmitted to the first bent leaf spring 31 via the input plate 6 and the counter plate 7, and the connecting member 3
The output plate 12 through the third and second bent leaf springs 32.
And is output to the second flywheel 3.

When a torsional vibration is input to the flywheel assembly, the first bent leaf spring 31 and the second bent leaf spring 32 repeatedly expand and contract, and the first and second bent leaf springs 31, 32 and the fluid flow. A viscous fluid passes between the chamber 17 and the viscous resistance generated at that time to damp the torsional vibration.
When the bent leaf springs 31 and 32 are compressed, each lever portion 2
The opening angle of 1 becomes small, and a bending moment acts on the ring portion 20. At this time, the lever portion 21 bends around the ring opening portion 23 as a fulcrum. The bending moment is evenly distributed in the longitudinal direction in the lever portion 21, and elastic energy is dispersed and stored in the plurality of ring portions 20.

The torsional characteristics in this case are determined by the torsional rigidity of the first and second curved leaf springs 31, 32. That is, in the small torsion angle range having the gap S ₂ between the ring-opening portions 23, the first and second bent leaf springs 3
The ring portion 20 and the lever portion 21 bend in the same direction with the outer peripheral portions of the ring portions 1 and 32 as fulcrums, and the torsional rigidity is small at this time. When the twist angle increases, the gap S ₂ becomes 0, and elastic energy is stored in the ring portion 20 with the ring-opening portion 23 as a fulcrum, so that the torsional rigidity increases.

In this embodiment, the first bent leaf spring 31 and the second bent leaf spring 32 are connected in series via a connecting member 33. Therefore, the rigidity of the whole is lower than in the past, and a wider twist angle than in the past can be obtained. As a result,
Torsional vibration damping characteristics are improved. Second Embodiment A pair of connecting members 33 shown in FIG.
It is fixed by. Therefore, the pair of connecting members 33
Rotates together. As a result, even if centrifugal force acts on the connecting member 33, the connecting member 33 is restricted from moving radially outward. That is, the connecting member 33 is the outer cylindrical portion 7a.
Hard to come into contact with. Therefore, frictional resistance is unlikely to occur between them.

[0022]

In the damper mechanism according to the first aspect of the present invention, since the first bent leaf spring and the second bent leaf spring are connected in series in the circumferential direction, the rigidity is reduced and the twist angle is wide. As a result, the torsional vibration damping characteristics are improved. In the damper mechanism according to claim 2, since the first bent leaf spring and the second bent leaf spring are connected in series in each arcuate chamber,
The lowering of rigidity and widening of the twisting angle are promoted, and the torsional vibration damping characteristics are improved.

In the damper mechanism according to the third aspect of the present invention, since the pair of connecting members are connected to each other so as to rotate integrally, the centrifugal forces acting on each other are balanced and the outward movement in the radial direction is restricted. ing. As a result, the connecting member is less likely to frictionally slide on the outer peripheral wall of the arcuate chamber or the like, and unnecessary frictional resistance is unlikely to occur.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a flywheel assembly according to a first embodiment of the present invention.

FIG. 2 is a partial cross-section II arrow view of FIG.

FIG. 3 is a partial front view of a bent leaf spring.

FIG. 4 is a schematic perspective view showing the arrangement of a bent leaf spring and a connecting member.

FIG. 5 is a plan view of a pair of connecting members according to the second embodiment.

[Explanation of symbols]

 1 1st Flywheel 3 2nd Flywheel 17 Fluid chamber 31 1st bending leaf spring 32 2nd bending leaf spring 33 Connecting member 34 1st contact part 35 2nd contact part

Claims (3)

[Claims] 1. A first rotating member, a second rotating member that forms an arcuate chamber together with the first rotating member, and the first rotating member is disposed inside the arcuate chamber and has a circumferential outer side at one end in the rotational direction as the first rotating member. A first bent leaf spring which abuts, and a second bent leaf spring which is disposed laterally of the first bent leaf spring in the arcuate chamber and whose outer circumferential side at the other end in the rotational direction abuts the second rotary member. An arc-shaped plate portion extending between the first bent leaf spring and the second bent leaf spring, and a circumferential direction of the arc-shaped plate portion extending from the other end in the rotation direction of the arc-shaped plate portion and the other end in the rotation direction of the first bent leaf spring. A connecting member having a first contact portion that contacts the outside and a second contact portion that extends from one end in the rotation direction of the arc-shaped plate portion and contacts the outside in the circumferential direction of one end in the rotation direction of the second bent leaf spring. And a damper mechanism. 2. A first rotating member, and a second rotating member that forms a pair of arcuate chambers together with the first rotating member.
A rotating member; a pair of first bending leaf springs respectively arranged in the pair of arcuate chambers, and one circumferential direction outer side of one end of the rotating direction abuts on the first rotating member; and the first bending member in the arcuate chambers. A pair of second bent leaf springs, which are respectively arranged on the lateral sides of the leaf springs, and in which the second rotating member abuts on the outer side in the circumferential direction at the other end in the rotation direction, the first bent leaf spring and the second bent leaf spring An arc-shaped plate portion extending between the arc-shaped plate portion and a first contact portion that extends from the other end of the arc-shaped plate portion in the rotational direction and abuts on the outer circumferential side of the other end of the first curved plate spring in the rotational direction. A pair of connecting members having a second contact portion that extends from one end of the plate portion in the rotational direction and abuts on the outer side of one end of the second curved leaf spring in the rotational direction in the circumferential direction. 3. The damper mechanism according to claim 2, wherein the pair of connecting members are connected to each other so as to rotate integrally.