JP2004028271A - Flywheel assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enlarge the coil diameter of a coil spring for use in a flywheel assembly, or to improve a disposition efficiency of the coil spring. <P>SOLUTION: This flywheel assembly 10 for transmitting a torque from a crankshaft 2 of an engine is provided with an input side rotating member 21, an output side rotating member 22 (including a flywheel 7), a plurality of arc coil springs 23, and a wire ring 24. A torque is input from the crankshaft 2 to the input side rotating member 21. The output side rotating member 22 is disposed relatively rotatably with the input side rotating member 21. The plurality of arc coil springs 23 are disposed in the rotating direction between the input side rotating member 21 and the output side rotating member 22 and, when the both are relatively rotated, the springs 23 are compressed between them in the rotating direction. The wire ring 24 is a member for allowing the movement of the plurality of arc coil springs 23 in the rotating direction while limiting their movement in the other directions, supported to, at least, one of the input side rotating member 21 and the output side rotating member 22, and penetrates through the plurality of arc coil springs 23. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flywheel assembly, and particularly to a flywheel assembly in which an output-side rotating member is connected to a crankshaft of an engine via an arc-shaped coil spring.
[0002]
[Prior art]
A flywheel is mounted on a crankshaft of the engine in order to absorb vibrations caused by combustion fluctuations of the engine. Further, a clutch device is provided on the transmission side of the flywheel in the axial direction. The clutch device includes a clutch disk assembly connected to an input shaft of a transmission, and a clutch cover assembly for urging a frictional connection of the clutch disk assembly to a flywheel. The clutch disk assembly has a damper mechanism for absorbing and attenuating torsional vibration. The damper mechanism has an elastic member such as a coil spring arranged to be compressed in the rotation direction.
[0003]
On the other hand, a structure in which a damper mechanism is provided between a flywheel and a crankshaft instead of a clutch disk assembly is also known. In this case, the flywheel is located on the output side of the vibration system bounded by the coil spring, and the inertia on the output side is larger than before. As a result, the resonance speed can be set to be equal to or lower than the idle speed, and a large damping performance can be realized. As described above, a structure configured by combining the flywheel and the damper mechanism is a flywheel assembly.
[0004]
[Problems to be solved by the invention]
The damper mechanism of the flywheel assembly mainly has a coil spring. The coil spring extends in the rotational direction, and an arc-type coil spring extending in an arc shape has been used for widening the torsional angle and reducing rigidity. Further, in such a coil spring, it is required to further improve the performance so that torsional vibration can be sufficiently absorbed and attenuated in response to a torque fluctuation from the engine. Specifically, it is desired to increase the coil diameter of the coil spring for further lowering the rigidity.
[0005]
However, the conventional flywheel assembly cannot increase the coil diameter of the coil spring. Specifically, both sides in the radial direction of the coil spring are supported by a retaining plate. Further, a cylindrical portion is provided on an outer peripheral edge of the retaining plate, which is disposed on an outer periphery of the retaining plate and supports a load from a coil spring that moves due to centrifugal force or deflection. As described above, since the member for supporting the coil spring is provided outside the coil spring, the coil diameter of the coil spring cannot be sufficiently increased in a predetermined space.
[0006]
An object of the present invention is to make it possible to increase the coil diameter of a coil spring used in a flywheel assembly, that is, to increase the arrangement efficiency of the coil spring.
[0007]
[Means for Solving the Problems]
The flywheel assembly according to claim 1 is for transmitting torque from a crankshaft of an engine, and includes an input-side rotating member, an output-side rotating member, a plurality of arc-shaped coil springs, and an annular member. And Torque is input to the input side rotation member from the crankshaft. The output-side rotating member is arranged to be rotatable relative to the input-side rotating member, and includes a flywheel. The plurality of arc-shaped coil springs are arranged between the rotation direction of the input-side rotation member and the output-side rotation member, and are compressed in the rotation direction between them when they rotate relative to each other. The annular member is a member for restricting movement of the plurality of arc-shaped coil springs in the other direction while allowing movement in the rotation direction, and is supported by at least one of the input-side rotation member and the output-side rotation member. Through the arc-shaped coil spring.
[0008]
In this flywheel assembly, torque from the crankshaft of the engine is transmitted in the order of the input side rotating member, the plurality of coil springs, and the output side rotating member. When combustion fluctuations from the engine are input to the flywheel assembly, the input-side rotating member and the output-side rotating member rotate relative to each other, and a plurality of coil springs move in the rotational direction along the annular member during the rotation. Compressed. Thereby, the torsional vibration is absorbed and attenuated.
[0009]
In this flywheel assembly, since the annular member penetrates through the plurality of coil springs, there is no need to arrange a member for supporting the coil spring outside the coil spring. As a result, it is possible to improve the performance by increasing the coil diameter of the plurality of coil springs.
According to a second aspect of the present invention, there is provided a flywheel assembly according to the first aspect, wherein at least one of the input-side rotating member and the output-side rotating member abuts on an end of the arc-shaped coil spring and supports the annular member. have.
[0010]
In this flywheel assembly, the support portion has a torque transmitting function by contacting the end of the arc-shaped coil spring. Further, the support portion has a function of supporting the annular member. Since the supporting portion has a plurality of functions, the number of components is reduced, and the structure is simplified.
In the flywheel assembly according to the third aspect, in the first aspect, the input-side rotating member has a first support portion in contact with an end of the arc-shaped coil spring, and the output-side rotating member has the arc-shaped coil. The spring has a second support portion that comes into contact with an end of the spring.
[0011]
In this flywheel assembly, since the plurality of arc-shaped coil springs are supported by the annular member, the first support portion and the second support portion need only support the ends of the arc-shaped coil springs. As a result, the first support portion and the second support portion have a simple structure and can be reduced in size.
In the flywheel assembly according to the fourth aspect, in the third aspect, one of the first support portion and the second support portion abuts only on the radially outer side of the end of the elastic member.
[0012]
In this flywheel assembly, since there is a support portion that abuts only on the radially outer side of the end of the arcuate coil spring, when the arcuate coil spring is compressed, it buckles (the center of the arcuate coil spring is radially outward. Projecting into a bent state). As a result, wear caused by interference between the arc-shaped coil spring and the wiring is reduced.
[0013]
According to a fifth aspect of the present invention, in the flywheel assembly according to the third or fourth aspect, the first support portion abuts and supports the annular member from one side in the radial direction, and the second support portion radially opposes the annular member. It is in contact with and supported from the side.
In this flywheel assembly, the annular member is radially supported by both the first support and the second support. For this reason, the structure and work for assembling the annular member to the support portion are simplified.
[0014]
In the flywheel assembly according to the sixth aspect, in the fifth aspect, the first support portion and the second support portion have a semicircular cross section along the circular cross section of the annular member. In this flywheel assembly, since the first support portion and the second support portion have a cross section along the cross section of the annular member, the support of the annular member is reliable.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
(1) Configuration
{Circle around (1)} Overall structure The clutch device 1 as an embodiment of the present invention shown in FIGS. 1 and 2 mainly includes a drive plate 4, a damper mechanism 6, a flywheel 7, a clutch cover assembly 8, And a clutch disk assembly 9. The clutch device 1 can be handled as one module in which members other than the drive plate 4 are combined. The flywheel assembly 10 is configured by a combination of the damper mechanism 6 and the flywheel 7.
[0016]
An engine (not shown) is arranged on the left side of FIG. 1, and a transmission (not shown) is arranged on the right side. The clutch device 1 is a device for interrupting torque between the crankshaft 2 on the engine side and the input shaft 3 on the transmission side.
The drive plate 4 is a disk-shaped plate member having a center hole formed therein, and is a member for transmitting torque from the crankshaft 2 to the flywheel 7 and the clutch cover assembly 8 via the damper mechanism 6. The inner peripheral portion of the drive plate 4 is fixed to the crankshaft 2 of the engine by pins 12 and bolts (not shown). The drive plate 4 is made of sheet metal and has high rigidity in the rotation direction but low rigidity in the bending direction.
[0017]
The flywheel 7 is an annular and disk-shaped member. The flywheel 7 has a friction surface 7a on the transmission side in the axial direction.
(2) Damper mechanism The damper mechanism 6 is a mechanism for absorbing and attenuating torsional vibration. The damper mechanism 6 includes an input-side rotating member 21, an output-side rotating member 22, a plurality of arc-shaped coil springs 23, And a wiring 24.
[0018]
a) Input-side rotating member The input-side rotating member 21 constitutes an input-side member of the damper mechanism 6, and includes a first plate 26 and a plurality of first brackets 27. The first plate 26 is an annular and disk-shaped sheet metal, a ring gear is provided on an outer peripheral portion, and a plurality of nuts 30 are provided on the engine side in the axial direction. The outer periphery of the drive plate 4 is fixed to the nut 30 via a bolt 29. The first bracket 27 is a member fixed to the first plate 26 at a plurality of positions (three positions) in the circumferential direction, and supports the end of the coil spring 23 in the rotation direction and supports the wiring 24. It is. Each first bracket 27 is composed of a fixed portion 27a and a support portion 27b extending from the radially inner end to the transmission side in the axial direction. The fixing portion 27 a is a flat plate portion, abuts against the inner peripheral portion of the first plate 26 from the engine side in the axial direction, and is fixed to the inner peripheral portion of the first plate 26 by a plurality of rivets 31. The support portion 27b has a curved portion 27c that is bent so as to protrude radially outward at an intermediate portion in the axial direction. The curved portion 27c has a substantially semicircular cross section.
[0019]
b) Output-side rotating member The output-side rotating member 22 constitutes an output-side member of the damper mechanism 6, and includes a part of the second plate 32 and a plurality of second brackets 33. The second plate 32 is a disk-shaped and annular member, and mainly includes a first disk-shaped portion 35, a cylindrical portion 36 extending from the outer peripheral edge to the transmission side in the axial direction, and a distal end to the inner peripheral side. And a second disc-shaped portion 37 extending to the right side. The cylindrical portion 35 a formed on the inner peripheral edge of the first disk-shaped portion 35 is rotatably supported by the crankshaft 2 via a rolling bearing 39. Further, the tip of the shaft 3 on the engine side in the axial direction is rotatably supported by the cylindrical portion 35 a via a bush 40. The first disc-shaped portion 35 has an annular spring support portion 35b that is recessed toward the transmission in the axial direction at a radially intermediate portion. Further, an outer peripheral portion 35c of the first disk-shaped portion 35 has a flat shape, and the flywheel 7 is fixed to a side surface of the transmission in the axial direction by a plurality of rivets 45. The tubular portion 36 covers the outer peripheral side of the flywheel 7, and further extends toward the axial transmission.
[0020]
The second bracket 33 is a member fixed to the first disc-shaped portion 35 of the second plate 32 at a plurality of places (three places) in the circumferential direction, supports the end of the coil spring 23 in the rotation direction, and This is a member for supporting the wiring 24. Each second bracket 33 is composed of a fixing portion 33a and a support portion 33b extending from the radially inner end to the transmission side in the axial direction. The fixing portion 33a is a flat plate portion, abuts against the inner peripheral portion of the first disc-shaped portion 35 of the second plate 32 from the transmission side in the axial direction, and is formed by a plurality of rivets 38 on the inner peripheral portion of the second plate 32. Fixed to. The support portion 33b has a curved portion 33c that is bent radially outward and inward at the axially intermediate portion. The curved portion 33c has a substantially semicircular cross section. The support portion 33b of the second bracket 33 extends from the second plate 32 toward the engine in the axial direction through a notch 35d formed in the first disk-shaped portion 35 of the second plate 32. The second bracket 33 is arranged corresponding to the first bracket 27, and the support portion 33b of the second bracket 33 is arranged close to the inside of the support portion 27b of the first bracket 27 in the radial direction. As a result, a space having a circular cross section is formed by the concave portions of the curved portion 27c of the first bracket 27 and the curved portion 33c of the second bracket 33.
[0021]
c) Wiring The wiring 24 is an annular member arranged between the concave portions of the curved portion 27c of the first bracket 27 and the curved portion 33c of the second bracket 33. That is, the wiring 24 is supported by the first bracket 27 and the second bracket 33. The wiring 24 is an annular member extending inside each of the coil springs 23 and supporting them so as to be movable only in the rotational direction.
[0022]
d) Coil spring The coil spring 23 forms an elastic member that is compressed in the rotation direction of the damper mechanism 6. The coil spring 23 is a plurality of members arranged side by side in the circumferential direction, and is arranged so as to extend in an arc shape in the circumferential direction. The coil spring 23 is an arc spring having a rotation direction angle of about 100 degrees, and is preferably in a range of 60 to 160 degrees. Further, in this embodiment, the coil spring 23 is a parent-child type including a combination of large and small springs, and includes a large coil spring 23a and a small coil spring 23b. The small coil spring 23b is arranged in the large coil spring 23a, and has a smaller coil diameter and a smaller wire diameter than the large coil spring 23a. The above-described wiring 24 is arranged inside the coil spring 23, specifically, inside the small coil spring 23b. As a result, the coil spring 23 is supported by the wiring 24 so that the coil spring 23 can move in the rotational direction along the wiring 24, but cannot move in other directions.
[0023]
The edge of the end of the coil spring 23 in the rotation direction is supported by the first bracket 27 and the second bracket 33. More specifically, the edge of the end of the coil spring 23 in the rotation direction is connected to the rotation edge (cross section) of the support portion 27b of the first bracket 27 and the rotation edge (cross section) of the support portion 33b of the second bracket 33. On the other hand, it is in contact with the rotating direction. The large coil spring 23a is in contact with the cross section of each of the support portions 27b and 33b except for the curved portions 27c and 33c, and the small coil spring 23b is in contact with the cross section of the curved portions 27c and 33c of each of the support portions 27b and 33b. . As described above, the first bracket 27 supports the radially outer portion of the coil spring 23, and the second bracket 33 supports the radially inner portion of the coil spring 23.
[0024]
e) Friction generating mechanism The damper mechanism 6 further has a friction generating mechanism 47 for generating a frictional resistance when the input side rotating member 21 and the output side rotating member 22 rotate relative to each other. The friction generating mechanism 47 is functionally disposed so as to function in parallel with the coil spring 23. Specifically, the friction generating mechanism 47 includes a plurality of wiring plates, and includes a first disk-shaped second plate 32. It is arranged between the outer peripheral portion 35 c of the portion 35 and the flywheel 7.
[0025]
(3) Clutch cover assembly The clutch cover assembly 8 mainly includes a part of the second plate 32, the pressure plate 14, the wiring 16, and the diaphragm spring 17. The pressure plate 14 is an annular member, and is disposed on the inner transmission side of the cylindrical portion 36 of the second plate 32 on the axial transmission side of the flywheel 7. The pressure plate 14 has a pressing surface 14 a facing the friction surface 7 a of the flywheel 7. The pressure plate 14 has a plurality of arc-shaped protrusions 14b formed on a surface of the pressure plate 14 opposite to the pressing surface 14a. The pressure plate 14 is fixed to the second plate 32 so as to be relatively non-rotatable by a plurality of strap plates 18 extending in an arc shape.
[0026]
The diaphragm spring 17 is a disk-shaped member disposed between the pressure plate 14 and the second disk-shaped portion 37 of the second plate 32, and has an annular elastic portion 17a and an inner peripheral side from the elastic portion 17a. And a plurality of extending lever portions 17b.
A plurality of stud pins (not shown) fixed to the inner peripheral portion of the second disk-shaped portion 37 extend through the hole of the diaphragm spring 17 toward the pressure plate 14. The wiring 16 supported by the stud pins supports the elastic portion 17a of the diaphragm spring 17 on the engine side in the axial direction.
[0027]
The second disk-shaped portion 37 has a plurality of arc-shaped protrusions 37 a formed corresponding to the wiring 16. The protruding portion 37a protrudes toward the engine in the axial direction, and is in contact with the inner peripheral edge of the elastic portion 17a of the diaphragm spring 17 from the transmission side in the axial direction.
(4) Clutch disc assembly The clutch disc assembly 9 has a friction facing 41 disposed between the friction surface 7a of the flywheel 7 and the pressing surface 14a of the pressure plate 14. The friction facing 41 is fixed to the hub 43 via a disk-shaped and annular plate 42. A transmission input shaft 3 extending from the transmission side is spline-engaged with a center hole of the hub 43.
[0028]
(2) Operation In this flywheel assembly 10, torque from the crankshaft 2 of the engine is transmitted in the order of the input-side rotating member 21, the plurality of coil springs 23, and the output-side rotating member 22. When combustion fluctuations from the engine are input to the flywheel assembly 10, the input-side rotating member 21 and the output-side rotating member 22 rotate relative to each other, and the plurality of coil springs 23 rotate in the rotational direction along the wiring 24 therebetween. Compressed while moving to. Thereby, the torsional vibration is absorbed and attenuated.
[0029]
The twisting operation of the damper mechanism 6 of the flywheel assembly 10 will be described more specifically. The input side rotation member 21 is fixed to another member, and the output side rotation member 22 is twisted to one side in the rotation direction. Then, the second bracket 33 moves away from the corresponding first bracket 27 in the rotation direction, and pushes the end of the coil spring 23 in the rotation direction. The coil spring 23 is compressed in the rotation direction along the wiring 24. That is, one end of the coil spring 23 is supported by the first bracket 27, and the other end is supported by the second bracket 33.
[0030]
(3) Operational Effect As described above, the coil spring 23 supports the coil spring 23 outside the coil spring 23 because the wire ring 24 which is a member for restricting the movement of the coil spring 23 passes therethrough. It is not necessary to arrange members for the purpose. As a result, the performance can be improved by increasing the coil diameter of the plurality of coil springs 23.
[0031]
Further, the other members do not require a special structure for supporting the coil spring 23, so that the structure is simplified and can be reduced. For example, since the first and second brackets 27 and 33 only need to support the coil spring 23, the first and second brackets 27 and 33 need not be annular, and are configured as a plurality of small members. Therefore, space saving and weight saving can be achieved.
[0032]
Further, the first and second brackets 27 and 32 have a torque transmitting function by contacting the ends of the coil spring 23. Further, the first and second brackets 27 and 32 have a function of supporting the wiring 24. As described above, since the first and second brackets 27 and 32 have a plurality of functions, the number of parts is reduced and the structure is simplified.
[0033]
Since the first bracket 27 abuts only on the radially outer side of the end of the coil spring 23, when the coil spring 23 is compressed, it buckles (the center of the arcuate coil spring projects radially outward and is bent. State). As a result, wear caused by interference between the coil spring 23 and the wiring 24 is reduced.
[0034]
The first bracket 27 is in contact with and supports the wiring 24 from one side in the radial direction, and the second bracket 33 is in contact with and supports the wiring 24 from the opposite side in the radial direction. Thus, the wiring 24 is supported by both the first bracket 27 and the second bracket 33 in the radial direction. Therefore, the structure and work for assembling the wiring 24 to the first and second brackets 27 and 33 are simplified.
[0035]
Further, the first bracket 27 and the second bracket 33 have a semicircular cross section along the circular cross section of the wiring 24. Thus, since the first bracket 27 and the second bracket 33 have a cross section along the cross section of the wiring 24, the support of the wiring 24 is reliable.
The present invention is not limited to the above embodiment, and various changes or modifications can be made without departing from the scope of the present invention.
[0036]
For example, in a flywheel assembly to which the present invention is applied, the clutch device may not be a modular type.
[0037]
【The invention's effect】
In the flywheel assembly according to the present invention, since the annular member penetrates through the plurality of coil springs, there is no need to arrange a member for supporting the coil spring outside the coil spring. As a result, it is possible to improve the performance by increasing the coil diameter of the plurality of coil springs.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a clutch device as one embodiment of the present invention.
FIG. 2 is a plan view of a damper mechanism of the clutch device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Clutch device 2 Crankshaft 6 Damper mechanism 7 Flywheel 8 Clutch cover assembly 9 Clutch disk assembly 10 Flywheel assembly 21 Input side rotating member 22 Output side rotating member 23 Coil spring 24 Wiring (annular member)
26 drive plate 27 first bracket (first support)
32 cover plate 33 second bracket (second support portion)

Claims (6)

A flywheel assembly for transmitting torque from an engine crankshaft,
An input-side rotating member to which torque is input from the crankshaft;
An output-side rotating member including a flywheel, which is disposed so as to be relatively rotatable on the input-side rotating member,
A plurality of arc-shaped coil springs arranged between the input side rotating member and the output side rotating member in the rotation direction, and compressed in the rotation direction between the two when the two rotate relatively,
A member for restricting movement of the plurality of arc-shaped coil springs in the other direction while allowing movement in the rotation direction, and supported by at least one of the input-side rotating member and the output-side rotating member. An annular member penetrating through the inside of the arc-shaped coil spring;
Flywheel assembly with. 2. The fly according to claim 1, wherein at least one of the input-side rotating member and the output-side rotating member abuts on an end of the arc-shaped coil spring and has a support portion for supporting the annular member. 3. Wheel assembly. The input-side rotating member has a first support portion in contact with an end of the arc-shaped coil spring,
2. The flywheel assembly according to claim 1, wherein the output-side rotating member has a second support that contacts an end of the arc-shaped coil spring. 3. The flywheel assembly according to claim 3, wherein one of the first support portion and the second support portion abuts only on a radially outer side of an end of the arc-shaped coil spring. 5. The said 1st support part is contacting and supporting the said annular member from one side in the radial direction, The said 2nd support part is contacting and supporting the said annular member from the radially opposite side. 4. The flywheel assembly according to claim 1. The flywheel assembly according to claim 5, wherein the first support portion and the second support portion have a semicircular cross-section along a circular cross-section of the annular member.

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