JP3462594B2 - Bent leaf spring and damper disk assembly - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bent leaf spring and a damper disk assembly employing the bent leaf spring.

[0002]

2. Description of the Related Art Generally, in a damper disk assembly, an input member (clutch plate or the like) capable of inputting torque from the engine side and an output side member (spline hub or the like) for outputting torque to an output side shaft are The elastic members are elastically coupled in the rotational direction. That is, the elastic member is elastically deformable in the circumferential direction between the input side member and the output side member. When torsional vibration is input to the damper disk assembly, the elastic member repeatedly expands and contracts in the circumferential direction to absorb torque fluctuations. Usually, a coil spring is used as the elastic member.
Bending leaf springs are used in the damper disk assembly disclosed in Japanese Patent Laid-Open No. Since the bending leaf spring has a large elastic energy occupying a unit volume, the width dimension of the spring can be reduced while sufficiently securing the torque transmission capacity.

[0003]

Since the conventional bent leaf spring is made of a single plate material, it is difficult to process and the manufacturing cost is high. For example, in order to form a bent leaf spring, it is necessary to bend the plate material in the direction of expansion and contraction of the spring, but bending the entire plate material requires a large load, which makes the machine large. Further, when it is necessary to form a thick portion and a thin portion on the plate material, it is necessary to form a uniform plate material into a corrugated shape. Also in this case, when the plate material is composed of one member, the load becomes large and the machine for processing becomes large.

An object of the present invention is to facilitate the processing of a bent leaf spring and reduce the manufacturing cost.

[0005]

A bent leaf spring according to one aspect of the present invention comprises a plurality of plate ring members and a plurality of plate lever members. The plurality of plate-shaped ring members are arranged in a staggered manner and have ring-opening portions. The plurality of plate-shaped lever members are detachably engaged with one ends of the ring-opening portions of the opposed plate-shaped ring members so that the plate-shaped ring members are connected in series.

It is preferable that the ring-opening portions of the opposed plate-shaped ring members face the opposite sides. The thickness of the plate ring member is preferably thinner than that of the plate lever member. A damper disk assembly according to another aspect of the present invention includes an input side plate, an output side hub, a fluid chamber, and a bent leaf spring. The output hub is arranged on the inner peripheral side of the input plate. The fluid chamber is formed between the input side plate and the output side hub. The bent leaf spring is arranged in an arc shape in the fluid chamber and is for transmitting torque from the input side plate to the output side hub. The bent leaf spring is composed of a plurality of plate-shaped ring members and a plurality of plate-shaped lever members. The plurality of plate-shaped ring members are arranged in a staggered manner and have ring-opening portions.
The plurality of plate-shaped lever members are detachably engaged with one ends of the ring-opening portions of the opposed plate-shaped ring members so that the plate-shaped ring members are connected in series.

[0007]

In the bent leaf spring according to the aspect of the present invention, when an external force acts on the plate lever member, a bending moment is applied to the plate ring member engaging with the plate lever member. As a result, each plate-shaped ring member is flexibly deformed to store elastic energy. Since the plate-shaped ring member and the plate-shaped lever member are separate members, when manufacturing this bent plate spring, it is not a single plate member but a plate member that becomes each plate-shaped ring member and each plate-shaped lever member. It may be processed such as bending. As a result, the processing becomes easy and the manufacturing cost is reduced.

When the ring-opening portions of the opposing plate-shaped ring members face the opposite side, the dimension of the plate-shaped lever member in the extending direction becomes short. When the thickness of the plate-shaped ring member is smaller than the thickness of the plate-shaped lever member, the amount of flexural deformation of the plate-shaped ring member increases. In this way, when the thickness of the plate-shaped ring member and the thickness of the plate-shaped lever member are made different, it was necessary to form a uniform plate member into a corrugated shape in the past, but in the present invention, a plurality of laminated members are formed. Each may be formed into a waveform.
Therefore, the processing is facilitated and the manufacturing cost is reduced.

In a damper disk assembly according to another aspect of the present invention, when torque is input to the input side plate,
The torque is transmitted to the output hub via the bent leaf spring. When the torsional vibration is input to the input side plate, the input side plate and the output side hub continue to rotate relative to each other, and the bending leaf spring repeats expansion and contraction between both members. Then, the viscous fluid in the fluid chamber flows through the gap between the bent leaf spring and the other member to generate a predetermined viscous resistance. As a result, the torsional vibration is damped.

[0010]

1 to 3 show a clutch disc assembly 100 to which an embodiment of the present invention is applied. OO in FIG. 1 is the rotation axis of the clutch disc assembly 100. At the center of the clutch disc assembly 100, a spline hub 1 connected to an input shaft (not shown) of the transmission is arranged. The spline hub 1 mainly has a spline hole 1a that engages with an outer peripheral spline portion of an input shaft (not shown). In addition, the spline hub 1 has an annular flange portion 2 projecting to the outer peripheral side.
Are integrally formed. As shown in FIG. 3, two protrusions 2a are formed on the outer periphery of the flange 2 at positions that face each other in the radial direction. Circumferentially formed step portions 2b are formed on both side surfaces of the flange portion 2, and O-rings 3 as seal mechanisms are arranged on the both step portions 2b, respectively. On the inner peripheral side of the step portion 2b, a plurality of elongated holes 2c penetrating the flange portion 2 in the axial direction and extending in the circumferential direction are formed at predetermined intervals in the circumferential direction.

On the outer peripheral side of the spline hub 1, a generally disc-shaped retaining plate 4 and a clutch plate 5 are arranged. A plurality of stop pin holes 4a, 5a are formed at predetermined intervals at the inner peripheral ends of both plates 4, 5, and the plates 4, 5 are provided in the holes 4a, 5a and the long hole 2c of the flange portion 2, respectively. It is attached to the flange portion 2 by the inserted stop pin 6. In addition, each plate 4, 5
Can be relatively rotated with respect to the flange portion 2 within a range where the long hole 2c is formed.

Further, annular bent portions 4b and 5b for fixing the O-ring 3 are formed on the inner peripheral portions of the plates 4 and 5, respectively. In addition, retaining plate 4
The outer periphery of the bent portion 4 that bends toward the clutch plate 5 side
c is formed. The bent portion 4c is fixed to the outer peripheral portion of the clutch plate 5 by the rivet 8 together with the cushioning plate 13. Further, in the bent portion 4c, locking portions 4d recessed toward the inner peripheral side are formed at two locations facing each other in the radial direction so as to correspond to the protruding portions 2a of the flange portion 2. The friction facings 7 are fixed on both sides of the cushioning plate 13.

With the above-mentioned structure, the retaining plate 4 and the clutch plate 5 arranged on both sides of the spline hub 1 form an annular liquid chamber 10 together with the flange 2. The liquid chamber 10 is filled with damper oil 11 having a predetermined viscosity. The liquid chamber 10 is sealed by an O-ring 3. Liquid chamber 1
A pair of bent leaf springs 12 is arranged in the zero position. The bent leaf springs 12 are arranged in a semicircular shape and can bend at wide angles. As shown in detail in FIG. 4, each bent leaf spring 12 includes a plurality of ring members 20 and a plurality of ring members 20.
It is composed of a lever member 21 that connects the members in series. The plurality of ring members 20 are arranged in a zigzag pattern in one direction, which reduces the radial dimension of the bent leaf spring 12. The ring member 20 in each row has an opening portion 23 facing the opposite side with respect to the opposing row. The lever member 21 has locking portions 21 a at both ends, and the locking portions 21 a are engaged with the ring opening portion 23 of the ring member 20. The ring member 20 is thinner than the lever member 21.

In the liquid chamber 10, a bent leaf spring 12
Forms a predetermined gap with the retaining plate 4, the clutch plate 5 and the flange portion 2. Next, the operation will be described. When the friction facing 7 is connected to a flywheel (not shown), torque is input to the clutch plate 5 and the retaining plate 4. This torque is applied to the retaining portion 4 of the retaining plate 4.
It is transmitted from d to the curved leaf spring 12, further transmitted to the spline hub 1 via the flange portion 2, and finally output to the input shaft of the transmission.

When the torsional vibration is input to the clutch disc assembly 100, the plates 4 and 5 which are the input side members and the spline hub 1 which is the output side member rotate relative to each other, and the bending leaf spring 12 is formed between them. Repeats expansion and contraction. At this time,
The damper oil 11 contained in the liquid chamber 10 passes through the gap formed between the bent leaf spring 12 and another member. As a result, the flow of the damper oil 11 is throttled,
Viscous resistance occurs according to the cross-sectional area of the gap. The torsional vibration is damped by the elastic deformation of the bent leaf spring 12 and the viscous resistance of the damper oil 11 described above. Also,
In this example, since the bent leaf spring 12 having a wide angle is used, the bending margin, that is, the twist angle can be widened. As a result, the characteristics of low rigidity and wide torsion angle are effective in damping torsional vibration.

Next, the operation when the bending leaf spring 12 is compressed will be described. When the bending leaf spring 12 is compressed, the lever member 21 is displaced and a bending moment acts on the ring member 20. Then, the plurality of ring members 20 are flexibly deformed to disperse and store elastic energy. Since the ring member 20 is thinner and less rigid than the lever member 21, the amount of deformation of the ring member 20 is large. Since the lever member 21 has high rigidity, the amount of deflection is small. Since the bent leaf spring 12 has a particularly small width dimension, elastic energy stored in a unit volume is larger than that of a conventional coil spring.

Further, the damper oil 11 in the liquid chamber 10
In order to lubricate the bent leaf spring 12, each plate 4, 5, and the flange portion 2, the bent leaf spring 12 smoothly expands and contracts, and wear of each member is prevented. As described above, in this embodiment, by using the bent leaf spring 12, the width dimension in the axial direction can be reduced while maintaining the spring rigidity as low as that of the conventional coil spring, so that the clutch disc assembly 100 can be obtained. The axial dimension of can be made sufficiently small.

Further, since the ring portion and the lever portion are composed of different members, the bending leaf spring 12 can be easily processed. That is, it is not necessary to form the bent leaf spring 12 from a continuous and integral plate material. Therefore, it is not necessary to upsize the machine. Furthermore, when it is desired to change the thickness of the bent leaf spring 12 between the ring member and the lever member, it is only necessary to facilitate the plate materials having different thicknesses, and it is not necessary to form the corrugated member into a uniform member as in the conventional case.
As a result, the processing is facilitated and the manufacturing cost is reduced.

[0019]

In the bent leaf spring according to one aspect of the present invention, the plate-shaped ring member and the plate-shaped lever member are different members, so that when manufacturing the bent leaf spring, it is not a single plate material. The plate material that becomes each plate-shaped ring member and each plate-shaped lever member may be bent or otherwise processed. As a result, the processing becomes easy and the manufacturing cost is reduced.

When the ring-opening portions of the opposed plate-shaped ring members face the opposite side, the dimension of the plate-shaped lever member in the extending direction becomes short. When the thickness of the plate-shaped ring member is smaller than the thickness of the plate-shaped lever member, the amount of flexural deformation of the plate-shaped ring member increases. In this way, when the thickness of the plate-shaped ring member and the thickness of the plate-shaped lever member are made different, it was necessary to form a uniform plate member into a corrugated shape in the past, but in the present invention, a plurality of laminated members are formed. Each may be formed into a waveform.
Therefore, the processing is facilitated and the manufacturing cost is reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a clutch disc assembly according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a partially cutaway II arrow view of FIG. 1.

FIG. 4 is a front partial view of a bent leaf spring.

[Explanation of symbols]

1 spline hub 2 Flange part 4 Retaining plate 5 clutch plate 10 Liquid chamber 12 Bending leaf spring 20 Ring member 21 Lever member 23 Opening part

Continuation of the front page (56) Reference JP-A-6-137341 (JP, A) Actually open 6-67946 (JP, U) Actually open 63-18619 (JP, U) Actually open 61-159280 (JP , U) Utsukai 52-125671 (JP, U) Japanese Patent Publication 42-20889 (JP, B1) U.S. Patent Publication 48-19685 (JP, Y1) US Patent 2775105 (US, A) US Patent 4252302 (US, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16D 11/00-23/14 F16F 15/121 F16F 15/133 F16F 1/00-6/00

Claims (6)

(57) [Claims] 1. A plurality of plate-shaped ring members that are arranged in a zigzag pattern and that have ring-opening portions, and the opening of the plate-shaped ring members that face each other so that the plate-shaped ring member is connected in series. A bent leaf spring, comprising a plurality of plate-shaped lever members that are detachably engaged with one ends of the ring portions. 2. The bent leaf spring according to claim 1, wherein the ring-opening portions of the plate-shaped ring members facing each other face the opposite side. 3. The bent leaf spring according to claim 1, wherein the plate-shaped ring member has a thickness smaller than that of the plate-shaped lever member. 4. An input side plate, an output side hub arranged on the inner peripheral side of the input side plate, a fluid chamber formed between the input side plate and the output side hub, and the fluid chamber. A curved leaf spring for transmitting torque from the input side plate to the output side hub, wherein the bent leaf springs are arranged in a staggered manner and have a plurality of plate shapes. A ring member, and a plurality of plate-shaped lever members releasably engaged with one ends of the ring-opening portions of the plate-shaped ring members facing each other so that the plate-shaped ring members are connected in series, Damper disk assembly. 5. The damper disk assembly according to claim 4, wherein the ring-opening portions of the plate-shaped ring members facing each other face the opposite side. 6. The damper disk assembly according to claim 4, wherein the plate ring member has a thickness smaller than that of the plate lever member.