JP2996566B2 - Bent leaf spring and damper disk using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved leaf spring, and more particularly to a curved leaf spring suitable for a clutch disk of an automobile. Further, the present invention provides a damper device using a curved leaf spring.
Disc.

[0002]

2. Description of the Related Art Generally, in a clutch disk assembly, an input member (clutch plate or the like) to which torque from the engine can be input and an output member (spline) for outputting torque to the output shaft. Hub and the like) are elastically connected in the rotational direction by a torsion spring. The torsion spring is usually formed by a coil spring, and absorbs torque fluctuation by expansion and contraction.

At this time, it is necessary to reduce the torsional stiffness of the coil spring in order to absorb a torque fluctuation under a low load. Generally, to reduce the torsional rigidity of the coil spring, the wire diameter of the coil may be reduced. However, when the wire diameter is reduced, the torque transmission capacity decreases. Therefore, the coil diameter of the coil spring is increased to reduce the rigidity while maintaining the torque transmission capacity. For this reason, the volume occupied by the coil spring increases, which hinders downsizing of the clutch disk assembly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bent leaf spring suitable for a clutch disk or the like, which enables a reduction in width while maintaining a low spring rigidity .
To provide a latch disk .

[0005]

Means for Solving the Problems] undulated plate spring according to claim 1, respectively a ring portion and a pair of lever Yusuke
A plurality of spring elements . The ring portion has a ring opening portion approaching each other with a gap. The pair of levers are formed integrally with the ring portion, and extend from the ring-opening portion to the opposite side of the ring portion with the ring-opening portion interposed therebetween such that the distance between the levers gradually increases. Then, the plurality of spring elements are compressed in series.
The levers are connected to each other so that they can be retracted.
When an external force is applied in a direction in which the pair of levers approach each other, the ring portion and the pair of levers can be elastically deformed with the ring opening portion abutting on each other as a fulcrum.

According to a second aspect of the present invention, a plurality of spring elements each having a ring portion and a pair of levers are provided.
It is equipped with a. The rings have ring openings that abut each other. The pair of levers are formed integrally with the ring portion, and extend from the ring-opening portion to the opposite side of the ring portion with the ring-opening portion interposed therebetween such that the distance between the levers gradually increases. And multiple
Number of spring elements leverage each other so that they can be compressed in series.
When the pair of levers receives an external force in a direction approaching each other, the ring portion and the pair of levers can be elastically deformed with the ring opening portion as a fulcrum.

According to a third aspect of the present invention, there is provided the curved leaf spring according to the first or second aspect, wherein the ring-opening portion of the ring portion has a curved surface portion which is convex on the opposite side. When the pair of levers elastically deform to approach each other, the fulcrum position on the curved surface moves in a direction away from the ring. The damper disk according to claim 4 is an engine
The input side plate member that can be connected to the side member and the output shaft
Output side member to be connected, input side plate member and output side portion
And a bent leaf spring for elastically connecting the
I have. The bent leaf spring has a ring and a pair of levers.
The that have each comprise a plurality of spring elements having the. Rin
The ring portion has a ring-opening portion approaching each other with a gap. 1
The pair of levers are formed integrally with the ring, and from the ring opening
The distance between the ring and the ring
It extends to gradually spread. And multiple
The levers are connected so that the spring elements can be compressed in series.
And a pair of levers move outward in a direction to approach each other.
When force is applied, the ring is
And the pair of levers can be elastically deformed.
You.

[0008] The damper disk according to the fifth aspect is characterized in that
Input side plate member that can be connected to the engine side member, and output
The output side member connected to the shaft and the input side plate member
Bent leaf spring that elastically connects the force side member in the rotational direction
And The bent leaf spring is paired with the ring part.
And a plurality of spring elements each having a bar
You. The ring portions have ring opening portions that abut each other. One pair
The lever is formed integrally with the ring, and opens from the ring opening
The distance between each other is opposite to the ring part across the part
It extends so that it spreads. And several springs
The levers are connected so that the elements can be compressed in series.
External force in the direction where the pair of levers approach each other.
When received, the ring and a pair of levers are
Can elastically deform.

[0009]

The bent leaf spring according to claim 1 and the bent spring according to claim 4 are provided.
In the bent leaf spring used for the described damper disk, when an external force acts on a pair of levers in a direction in which they approach each other, the levers are displaced, and a bending moment is applied to a ring portion connected to the levers. Is added. When the lever is displaced and the ring opening of the ring abuts, the ring opening becomes a fulcrum. As a result, the stress around the ring opening increases and the stress at the top of the ring decreases significantly. In addition, when the lever is elastically deformed with the ring opening as a fulcrum, not only the lever but also the ring is elastically deformed, thereby applying stress to the ring. In this way, the stress distribution becomes uniform. In addition, since a gap is secured in the ring opening portion of the ring portion, when the bent leaf spring is compressed, the ring portion flexes around the vertex of the ring portion until the gap of the ring opening portion disappears, resulting in low rigidity. When the gap between the ring-opening portions is eliminated, the lever bends with the ring-opening portion as a fulcrum thereafter to obtain high rigidity characteristics.

A bent leaf spring according to claim 2 and a claim
Bent plate used for the damper disk described in 5
In the spring , when an external force acts on a pair of levers in a direction in which they approach each other, the levers are elastically deformed, and a bending moment is also applied to a ring portion connected to the levers. Since the ring opening becomes the fulcrum when the lever is displaced, the stress around the ring opening increases and the stress at the top of the ring decreases. Moreover, since the lever and the ring portion are elastically deformed, the stress distribution becomes uniform.

In the bent leaf spring according to the third aspect, the ring-opening portion has a curved surface portion, and a position in the curved surface portion becomes a fulcrum when the pair of levers is elastically deformed. And 1
When the pair of levers elastically deform in a direction approaching each other, the fulcrum position moves in a direction away from the ring portion. As a result, when the external force increases, the arm length of the lever decreases correspondingly, and the rigidity increases.

[0012]

1 to 3 show a clutch disk assembly according to an embodiment of the present invention. In the figure, OO
Is the center line. A spline hub 1 that can be connected to an output shaft (not shown) is disposed at the center of the clutch disk assembly. The spline hub 1 has a spline hole 1a that meshes with an outer spline portion of an output shaft (not shown).
At the center. Also, the spline hub 1 has
A flange portion 2 protruding to the outer peripheral side is integrally formed. As shown in FIG. 3, two protrusions 2a are formed on the outer periphery of the flange 2 at opposing positions. Step portions 2b are formed on both sides of the flange portion 2 in a circumferential shape, and O-rings 3 as sealing mechanisms are arranged on both step portions 2b. A plurality of long holes 2c penetrating the flange 2 in the axial direction and extending in the circumferential direction on the inner peripheral side of the step portion 2b.
Are formed at predetermined intervals.

A generally disk-shaped retaining plate 4 and a clutch plate 5 are arranged on the outer peripheral side of the spline hub 1. A plurality of stop pin holes 4a, 5a are formed at predetermined intervals in the retaining plate 4 and the clutch plate 5, and these two plates 4, 5 are formed.
Are mounted on the flange 2 by stop pins 6 inserted into the holes 4a, 5a and the elongated hole 2c of the flange 2.
Each of the plates 4 and 5 is rotatable relative to the flange 2 in a range where the elongated hole 2c is formed.

A bent portion 4 for fixing the O-ring 3 with the step portion 2b is provided on the inner peripheral portion of each of the plates 4 and 5.
b, 5b are formed. Further, a bent portion 4c that is bent toward the clutch plate 5 is formed on the outer peripheral portion of the retaining plate 4. The bent portion 4c is fixed to the outer peripheral portion of the clutch plate 5 by a rivet 8 together with the clutch disk. As shown in FIG. 3, a locking portion 4 d formed by drawing so as to protrude inward is formed corresponding to the projection 2 a of the flange 2 at two opposing positions in the bent portion 4 c. ing.

With such a configuration, the spline hub 1
The retaining plate 4 and the clutch plate 5 arranged on both side surfaces of the liquid crystal chamber together with the flange 2 form an annular liquid chamber 10, which is sealed by the O-ring 3. The liquid chamber 10 includes a projection 2a and a locking portion 4d.
And is divided into two semicircular arc-shaped chambers.

A damper oil having a predetermined viscosity is accommodated in the liquid chamber 10. Inside the liquid chamber 10, a pair of bent leaf springs 12 are provided inside the two arc-shaped chambers.
Are arranged respectively. The bent leaf spring 12 is shown in FIG.
As shown in FIG. 2, a plurality of spring elements formed by integrally forming a ring portion 20 and a pair of lever portions 21 are connected in series so as to be compressible. In this embodiment, each of the spring elements of the bent leaf spring 12 is formed by alternately bending an integral elongated plate into a wave shape. And between the ring part 20 and a pair of lever parts 21 (ring opening part) is a curved surface part which becomes convex toward the opposite side. The bent leaf spring 12 thus formed is
Each arc-shaped chamber is arranged so as to extend in an arc shape and is elastically deformable in a circumferential direction.

In such a configuration, a plurality of ring portions 20 are arranged on the opposite sides. Each ring part 20
Are annular bodies having substantially the same diameter, and each of the adjacent ring portions 20
A gap .delta.1 of a predetermined length is provided between them. The ring portion 20 has a ring opening portion 23 formed inside, and the ring opening portion 23
Are in close contact with each other in the set state, and the lever portions 21 extend outward from both sides of the ring opening portion 23, that is, extend from the ring opening portion 23 to the opposite side with the ring opening portion 23 interposed therebetween.

The lever portions 21 extend so that the distance between the lever portions 21 increases outward, and are continuous with one of the ring opening portions 23 of the opposed ring portion 20. In other words, the ring opening portions 23 of the ring portions 20 connected to each other.
Are arranged so as to face each other and are shifted in the circumferential direction. The ring portions 20 at both ends in the circumferential direction are
And the locking portion 4d. A plurality of fluid filling spaces 11 filled with, for example, damper oil having a predetermined viscosity are formed between each of the portions extending toward the inner peripheral side of the bent leaf spring 12 and the outer peripheral wall and the side wall of the liquid chamber 10. .
That is, as is clear from FIG. 3, each outer ring portion 20 comes into contact with the inner peripheral surface of the bent portion 4c and
This prevents the damper oil from moving between each other. As shown in FIG. 1, the axial end face of the bent leaf spring 12 and the liquid chamber 10
A small choke gap C is formed between the side wall (clutch plate 5 and retaining plate 4).

Next, the operation will be described. Torque is transmitted to the clutch plate 5 and the retaining plate 4 via the friction facings 7. The transmitted torque is transmitted from the locking portion 4d of the retaining plate 4 to the bent leaf spring 12. The torque transmitted to the bent leaf spring 12 is transmitted from the spline hub 1 to an output shaft (not shown) via the flange portion 2.

When torsional vibration is input to the clutch disk assembly 1 due to engine torque fluctuations, the plates 4, 5 and the spline hub 1 rotate periodically. When the bent leaf spring 12 is compressed, each lever 21
Is deformed by external force. That is, the opening angle of each lever portion 21 becomes small, and a bending moment acts on the ring portion 20. At this time, the lever portion 21 bends about the ring opening portion 23 as a fulcrum. Since the ring portion 20 is also elastically deformed, elastic energy is dispersed and stored in the plurality of ring portions 20. In addition, since the bent leaf spring 12 has a particularly small width, the elastic energy stored in a unit volume is larger than that of a conventional coil spring.
Ring opening portion 2 of ring portion 20 when lever portion 21 is displaced
Since the fulcrum 3 serves as a fulcrum, the stress around the ring opening portion 23 increases, and the stress at the apex of the ring portion 20 is significantly reduced. In this way, the stress of each spring element becomes more uniform.

Further, since a portion between the ring portion 20 and the lever portion 21 has a curved surface protruding toward the opposite side,
The fulcrum moves in a direction away from the ring part 20 with the deformation of the lever part 21. Thereby, the arm length of the lever portion 21 is shortened, and the rigidity is increased. As described above, when the torsional angle between the plates 4 and 5 and the spline hub 1 increases, the rigidity increases, so that the torque transmission capacity can be increased while absorbing the torsional vibration.

When the bent leaf spring 12 is compressed, the damper oil filled in the plurality of viscous fluid filling spaces 11 is formed by the choke formed between the retaining plate 4 and the clutch plate 5 and the bent leaf spring 12. It passes through the gap C. Thereby, the flow of the damper oil is restricted, and a predetermined viscous damping force is generated. Thereby, a hysteresis torque corresponding to the cross-sectional area of the gap is obtained.

Further, the damper oil lubricates each member in the viscous fluid filling space 11, so that the compression operation of the curved leaf spring 12 can be smooth and wear of each member can be prevented. As described above, in the present embodiment, the bent leaf spring 12
By using, the width dimension in the axial direction can be reduced while maintaining the same low spring stiffness as the conventional coil spring, so that the axial dimension of the clutch disk assembly can be reduced.

In particular, in this clutch disk assembly, a spring function and a viscous resistance function are realized by a simple structure in which the bent leaf spring 12 is simply disposed in the liquid chamber 10. Conventionally, a friction generating mechanism composed of a coil spring and a plurality of plates had to be separately provided, which resulted in a complicated and large structure. In addition, the bent leaf spring 12 is a member that extends long in the circumferential direction and can increase the bending allowance, that is, the torsion angle, and is thus effective in absorbing torque fluctuation.

[Other Embodiments] (a) In the above embodiment, the ring opening portion 23 of the bent leaf spring 12 is configured to be in close contact at the time of setting. However, as shown in FIG. May be formed in the gap. In this case, when the bent leaf spring 25 is compressed, the opening angle of each lever portion 21 decreases, and a bending moment acts on the ring portion 20. At this time, first, until the gap δ2 of the ring-opening portion 23 becomes “0”, a low-rigidity torsional characteristic is observed due to the rigidity of the ring portion 20. When the compression is further continued, the lever portion 21 bends with the ring opening portion 23 as a fulcrum, and a relatively high rigidity torsional characteristic is obtained. Thereby, a two-stage torsional characteristic can be obtained.

(B) In the above embodiment, both ends in the circumferential direction of the bent leaf spring 12 are configured to abut on the locking portion 4d of the retaining plate 4 by the ring portion 20, but FIG. 6 and FIG. As shown, the contact portions 22 may be formed at the distal ends of the lever portions 21 disposed at both ends of the bent leaf spring 26. The contact portion 22 is formed by bending the distal end portion of the lever portion 21 in a U-shape, and is located on the outer peripheral side (upward in the drawing) from the center line SS in the height direction of the bent leaf spring 26. It is formed offset.

On the other hand, the locking portion 4 of the retaining plate 4
“e” is formed such that the tip is located up to the center of the bent leaf spring 26 in the height direction. For this reason, the contact part 22 contacts the locking part 4e. Therefore, even when the curved leaf spring 26 is arranged in an arc shape in the liquid chamber 10 and compressed, the outer peripheral side wall of the curved leaf spring 26 is not pressed against the outer peripheral wall of the retaining plate 4.

(C) In the above embodiment, the thickness of the bent leaf spring 12 is made uniform. However, as shown in FIG. 8, the thickness d may be freely changed in the longitudinal direction. Thereby, the bending stress on the bent leaf spring 27 becomes uniform,
A large bending displacement can be obtained. (D) In the above embodiment, the cross section of the bent leaf spring 12 is formed in a rectangular shape. However, as shown in FIG. In this case, the width dimension of the middle portion in the height direction of the bent leaf spring 28, which exerts the smallest bending stress, is minimized. Thereby, the bending stress generated in the expanded and contracted state becomes uniform in the height direction, and the weight can be reduced.

(E) In the above embodiment, the plurality of ring portions 20 of the bent leaf spring 12 have substantially the same shape.
As shown in FIG. 10, annular bodies 30 and 31 having different diameters may be formed. In this case, the amount of dispersion of elastic energy can be adjusted at the outer peripheral portion and the inner peripheral portion of the bent leaf spring 29. (F) In the above embodiment, the fluid filling space 11 for generating the hysteresis torque by viscous damping is formed,
Although the liquid is sealed therein, the hysteresis torque may be generated by a conventionally used friction material or the like. In this case, the fluid filling space 11 and the liquid become unnecessary.

[0030]

In the bent leaf spring according to the present invention, when the pair of levers is displaced, the ring opening portion of the ring portion serves as a fulcrum, and the lever and the ring portion are elastically deformed. In addition, the stress at the top of the ring portion is significantly reduced. For this reason, the stress distribution becomes uniform.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a damper disk according to an embodiment of the present invention.

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

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

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

FIG. 5 is a view of another embodiment corresponding to FIG. 4;

FIG. 6 is a view of still another embodiment corresponding to FIG. 4;

7 is a partially enlarged view of the same embodiment as FIG. 6 corresponding to FIG. 3;

FIG. 8 is a view showing still another embodiment corresponding to FIG. 4;

FIG. 9 is a side view of a bent leaf spring according to still another embodiment.

FIG. 10 is a view of still another embodiment corresponding to FIG. 4;

[Explanation of symbols]

 12, 25, 26, 27, 28, 29 Bent leaf spring 20, 30, 31 Ring part 21 Lever part 23 Ring opening part

Continued on the front page (56) References Japanese Utility Model Sho 61-42187 (JP, U) Japanese Utility Model Sho 55-115440 (JP, U) Japanese Utility Model Sho 62-202529 (JP, U) Japanese Patent Publication No. 37-12099 (JP) , B1) Patent 172658 (JP, C1)

Claims (5)

(57) [Claims] A ring having a ring-opening portion approaching to each other with a gap therebetween; and a ring formed integrally with the ring, and from the ring-opening to a side opposite to the ring with the ring-opening interposed therebetween. each a pair of levers extending as distance therebetween widens gradually, the Te comprises a plurality of spring elements having said plurality of spring elements each other so as to be compressed in series
When the pair of levers receives an external force in a direction in which the levers approach each other, the ring portion and the pair of levers can be elastically deformed with the ring opening portion abutting on each other as a fulcrum. Is a bent leaf spring. 2. A ring portion having an open ring portion that abuts with each other; and a space formed integrally with the ring portion and spaced from the open ring portion toward the opposite side of the ring portion with the open ring portion interposed therebetween. A plurality of levers , each of which has a pair of levers extending so as to gradually expand , said plurality of spring elements each other being serially compressible with each other.
Are connected, and when the pair of levers receives an external force in a direction approaching each other, the ring portion and the pair of levers can be elastically deformed with the ring opening portion as a fulcrum. Bent leaf spring. 3. The ring-opening portion of the ring portion has a curved surface portion that is convex on the opposite side, and when the pair of levers elastically deform so as to approach each other, the curved surface portion. The bent leaf spring according to claim 1 or 2, wherein the fulcrum position in (1) moves in a direction away from the ring portion. 4. An input side play connectable to an engine side member.
G member, An output member connected to the output shaft; The input side plate member and the output side member are elastically
Sexually coupled bent leaf springs, The bent leaf spring includes: A ring portion having a ring opening portion approaching each other with a gap
When, The ring is formed integrally with the ring, and the ring is opened from the ring opening.
The distance between each other toward the opposite side of the ring from the ring
A pair of levers extending so as to gradually spread, Comprising a plurality of spring elements each having The plurality of spring elements are mutually connected so as to be compressible in series.
Are connected, The pair of levers receives an external force in a direction approaching each other
And the ring with the ring opening portion abutting on each other as a fulcrum.
The part and the pair of levers are capable of elastic deformation. Damper disk. 5. An input side play connectable to an engine side member.
G member, An output member connected to the output shaft; The input side plate member and the output side member are elastically
Sexually coupled bent leaf springs, The bent leaf spring includes: A ring portion having a ring opening portion abutting on each other, The ring is formed integrally with the ring, and the ring is opened from the ring opening.
The distance between each other toward the opposite side of the ring from the ring
A pair of levers extending so as to gradually spread, Comprising a plurality of spring elements each having The plurality of spring elements are mutually connected so as to be compressible in series.
Are connected, The pair of levers receives an external force in a direction approaching each other
And the ring portion and the pair of lenses with the ring opening portion as a fulcrum.
The bar is capable of elastic deformation, Damper disk.