JP3752371B2 - Diaphragm spring and clutch cover assembly - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a diaphragm spring of a clutch cover assembly that is mounted on a driving member together with a clutch cover and presses a driven member against the driving member via a pressure plate in conjunction with a release member, and a clutch cover assembly.
[0002]
[Prior art]
  Generally, a clutch device includes a clutch cover assembly for pressing a clutch disk against a flywheel and releasing the pressing. The clutch cover assembly includes a pressure plate for clamping the clutch disc between the flywheel and a diaphragm spring or a coil spring for biasing the pressure plate against the clutch disc. Is housed in a clutch cover fixed to the flywheel.
[0003]
  For example, in a push-type clutch cover assembly, the diaphragm spring has a support portion supported by the clutch cover as a fulcrum, and a pressing portion formed on the outer peripheral side of the support portion presses the pressure plate. Further, the release member abuts on the tip (inner periphery) portion of the lever portion extending from the support portion to the inner periphery side. By moving the release member to the engine side, the pressing portion is pulled up to the transmission side with the support portion as a fulcrum, and the pressure on the pressure plate is released.
[0004]
  In the pull type clutch cover assembly, the diaphragm spring presses the pressure plate with a pressing portion formed on the inner peripheral side of the supporting portion, with the supporting portion supported by the clutch cover as a fulcrum. In addition, the release member abuts on the tip (inner circumference) portion of the lever portion extending from the pressing portion toward the inner circumference side. By moving the release member to the transmission side, the pressing portion is pulled up to the transmission side, and the pressure on the pressure plate is released.
[0005]
[Problems to be solved by the invention]
  In the operation of the clutch device, it is desirable that the on / off operation of the clutch faithfully follows the movement of the release member.
[0006]
  However, in the clutch device using the clutch cover assembly as described above, the elastic deformation of the diaphragm spring is a major factor in the decrease in the followability to the movement of the release member together with the elastic deformation of the clutch cover. That is, when the pressure plate is moved through the diaphragm spring by the movement of the release member, the diaphragm spring and the clutch cover are elastically deformed, so that a time loss occurs between the movement of the release member and the movement of the pressure plate. .
[0007]
  In order to improve the followability of the clutch device against the movement of the release member, in addition to measures such as increasing the plate thickness of the diaphragm spring and the clutch cover, in order to avoid an increase in weight due to an increase in plate thickness, for example, a rib is attached to the diaphragm spring. Measures are taken to increase rigidity by providing An example of the rib 92a of the diaphragm spring 91 is shown in FIGS. The rib 92 a extends in the radial direction at the center portion of the lever portion 92 of the diaphragm spring 91, and the release bearing (release member) 99 is in contact with the inner peripheral side tip portion of the lever portion 92. However, the rib 92a is not formed over the entire radial direction of the lever portion 92, and the tip portion of the lever portion 92 requires a flat portion on which the release bearing 99 abuts. It is left as it is without being processed.
[0008]
  However, higher followability of the clutch device with respect to the movement of the release member is required, and it is desired to reduce the clutch pedal depression force without reducing the conventional followability.
[0009]
  An object of the present invention is to improve the followability of the clutch device with respect to the movement of the release member by improving the rigidity of the lever portion of the diaphragm spring, or without reducing the followability of the clutch device with respect to the movement of the release member. It is to lengthen the part to reduce the release load of the clutch device.
[0010]
[Means for Solving the Problems]
  The diaphragm spring according to claim 1 is mounted on a drive side member together with a clutch cover, and the driven member is interlocked with the release member.,A diaphragm spring of a clutch cover assembly that presses against a drive member via a pressure plate, and includes a support portion, a pressing portion, and a plurality of lever portions. The support portion is supported by the clutch cover. A press part is a part formed in the outer peripheral side of a support part, and presses a pressure plate with respect to a to-be-driven member. The lever portion extends from the support portion to the inner peripheral side, and the inner peripheral side front end portion comes into contact with the release member. A rib is formed on the lever portion. The rib extends in the radial direction continuously to the inner peripheral side tip of the lever portion, and has a width wider than the circumferential width of the inner peripheral side tip. And leverPartIn this case, a flat portion that rises from the portion where the rib is not formed is formed by the formation of the rib, and the release member abuts on the flat portion.
[0011]
  In the conventional diaphragm spring, a rib is formed so as to swell the central portion of the lever portion, but no rib is formed over the entire radial direction of the lever portion. In particular, since the front end portion of the lever portion requires a flat portion on which the release member abuts, it is left flat without being processed such as rib formation.
[0012]
  In the present invention, the rib is formed so as to continue to the tip on the inner peripheral side of the lever portion, and the release member is brought into contact with the portion of the lever portion that is raised by the formation of the rib. By forming the rib up to the tip on the inner peripheral side of the lever in this way, the bending rigidity of the lever can be set larger than that of a conventional diaphragm spring having the same structure. Accordingly, the amount of elastic deformation per unit load of the lever portion is reduced, the time loss of the movement of the pressing portion of the diaphragm spring with respect to the movement of the release member is reduced, and the followability of the clutch device to the movement of the release member is improved. Moreover, even if the lever part of the diaphragm spring is lengthened, it is possible to ensure the same bending rigidity, so that the lever ratio can be increased without reducing the followability of the clutch device to the movement of the release member. The release load of the clutch device can be reduced and the clutch pedal depression force can be reduced.
[0013]
  The rib formed on the lever portion may be a rib whose top is a flat surface or a rib whose cross section is an arch shape. However, even in the case of forming a rib having a cross section in an arch shape, it is desirable that the surface that the release member contacts is a flat surface..
[0014]
  The diaphragm spring according to claim 2 is a diaphragm spring of a clutch cover assembly that is attached to a driving member together with a clutch cover and presses a driven member against the driving member via a pressure plate in conjunction with the release member. And it is provided with a support part, a press part, and a plurality of lever parts. The support portion is supported by the clutch cover. The pressing portion is a portion formed on the outer peripheral side of the support portion, and presses the pressure plate against the driven member. Each of the plurality of lever portions has an inner peripheral lever portion and an outer peripheral lever portion, and extends from the support portion to the inner peripheral side. The inner peripheral side tip of the inner peripheral lever portion of the lever portion contacts the release member. The outer peripheral lever portion of the lever portion connects the outer peripheral end of the inner peripheral lever portion of the lever portion and the support portion, and the circumferential width is larger than the circumferential width of the outer peripheral end of the inner peripheral lever portion of the lever portion. Is too narrow. Of the inner peripheral lever portion of the lever portion, both ends in the circumferential direction are bent. In addition, the lever portion is formed with a rib that extends in a radial direction continuously to the inner circumferential end of the lever portion and has a width wider than the circumferential width of the inner circumferential tip. And leverPartIn this case, a flat portion raised from the portion where the rib is not formed is formed by the formation of the rib, and the release member abuts on the flat portion.
[0015]
In general, the lever portion of the diaphragm spring includes an outer lever portion that is narrow in the circumferential direction to avoid interference with a support mechanism that supports the diaphragm spring on the clutch cover, and an inner lever side from the outer lever portion. It is often composed of an inner peripheral lever portion that extends. In such a structure, since the inner circumferential lever portion is set to have a wide circumferential width within a range not interfering with other adjacent inner circumferential lever portions, the circumference of the outer circumferential portion of the inner circumferential lever portion is inevitably set. The width in the direction is larger than the circumferential width of the outer peripheral lever portion.
[0016]
In the conventional diaphragm spring having such a structure, the rigidity of the outer peripheral portion of the inner peripheral lever portion that is wider than the circumferential width of the outer peripheral lever portion is improved. There is no particular idea to make it happen.
[0017]
Therefore, in the invention described in the present claim, the inner circumferential lever portion is processed so as to bend both ends in the circumferential direction. For this reason, the bending rigidity of a lever part can be set largely compared with the conventional diaphragm spring which is the same in other structures. Accordingly, the amount of elastic deformation per unit load of the lever portion is reduced, the time loss of the movement of the pressing portion of the diaphragm spring with respect to the movement of the release member is reduced, and the followability of the clutch device to the movement of the release member is improved. Moreover, even if the lever part of the diaphragm spring is lengthened, it is possible to ensure the same bending rigidity, so that the lever ratio can be increased without reducing the followability of the clutch device to the movement of the release member. The release load of the clutch device can be reduced and the clutch pedal depression force can be reduced.
[0018]
  The diaphragm spring according to claim 3 is a diaphragm spring of a clutch cover assembly which is attached to a driving member together with a clutch cover and presses a driven member against the driving member via a pressure plate in conjunction with the release member. And it is provided with a support part, a press part, and a plurality of lever parts. The support portion is supported by the clutch cover. A pressing part is a part formed in the inner peripheral side of a support part, and presses a pressure plate with respect to a to-be-driven member. The lever portion extends from the pressing portion toward the inner peripheral side, and the inner peripheral side front end portion comes into contact with the release member. A rib is formed on the lever portion. The rib extends in the radial direction continuously to the inner circumferential side tip of the lever portion and has a width wider than the circumferential width of the inner circumferential side tip. And leverPartIn this case, a flat portion raised from the portion where the rib is not formed is formed by the formation of the rib, and the release member abuts on the flat portion.
[0019]
  In the conventional diaphragm spring, a rib is formed so as to swell the central portion of the lever portion, but no rib is formed over the entire radial direction of the lever portion. In particular, since the front end portion of the lever portion requires a flat portion on which the release member abuts, it is left flat without being processed such as rib formation.
[0020]
  In the present invention, the rib is formed so as to continue to the tip on the inner peripheral side of the lever portion, and the release member is brought into contact with the portion of the lever portion that is raised by the formation of the rib. By forming the rib up to the tip on the inner peripheral side of the lever in this way, the bending rigidity of the lever can be set larger than that of a conventional diaphragm spring having the same structure. Accordingly, the amount of elastic deformation per unit load of the lever portion is reduced, the time loss of the movement of the pressing portion of the diaphragm spring with respect to the movement of the release member is reduced, and the followability of the clutch device to the movement of the release member is improved. Moreover, even if the lever part of the diaphragm spring is lengthened, it is possible to ensure the same bending rigidity, so that the lever ratio can be increased without reducing the followability of the clutch device to the movement of the release member. The release load of the clutch device can be reduced and the clutch pedal depression force can be reduced.
[0021]
  The rib formed on the lever portion may be a rib whose top is a flat surface or a rib whose cross section is an arch shape. However, even in the case of forming a rib having a cross section in an arch shape, it is desirable that the surface with which the release member is in contact is a flat surface..
[0022]
  The diaphragm spring according to claim 4 is a diaphragm spring of a clutch cover assembly which is attached to a driving member together with a clutch cover and presses a driven member against the driving member via a pressure plate in conjunction with the release member. And it is provided with a support part, a press part, and a plurality of lever parts. The support portion is supported by the clutch cover. The pressing portion is a portion formed on the inner peripheral side of the support portion, and presses the pressure plate against the driven member. Each of the plurality of lever portions has an inner peripheral lever portion and an outer peripheral lever portion, and extends from the pressing portion to the inner peripheral side. The inner peripheral side tip of the inner peripheral lever portion of the lever portion contacts the release member. The outer peripheral lever portion of the lever portion connects the outer peripheral end of the inner peripheral lever portion of the lever portion and the support portion, and the circumferential width is larger than the circumferential width of the outer peripheral end of the inner peripheral lever portion of the lever portion. Is too narrow. Of the inner peripheral lever portion of the lever portion, both ends in the circumferential direction are bent. In addition, the lever portion is formed with a rib that extends in a radial direction continuously to the inner circumferential end of the lever portion and has a width wider than the circumferential width of the inner circumferential tip. And leverPartIn this case, a flat portion raised from the portion where the rib is not formed is formed by the formation of the rib, and the release member abuts on the flat portion.
[0023]
  Claim5The clutch cover assembly described in 1 is a clutch cover assembly for pressing or releasing the driven member against the driving member, and includes a clutch cover, a pressure plate, and a diaphragm spring. The clutch cover is fixed to the drive member. The pressure plate is disposed on the inner peripheral side of the clutch cover, is not rotatable relative to the clutch cover, and is movable in the axis OO direction. Diaphragm spring from claim 14And is supported by a clutch cover.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
  [First Embodiment]
  The clutch cover assembly 1 shown in FIG. 1 presses the friction member 51 of the clutch disk assembly (driven member) against the flywheel (driving member) 50 to connect the clutch, or releases the pressing to disconnect the clutch. It is one of the main assemblies which constitute the clutch device for this purpose. A clutch cover assembly 1 shown in FIG. 1 is for a push-type clutch device, and mainly includes a clutch cover 2, a pressure plate 3, and a diaphragm spring 4.
[0025]
  The clutch cover 2 is a substantially dish-shaped plate member, and an outer peripheral portion thereof is fixed to the flywheel 50 by, for example, a bolt. A large-diameter hole is formed at the center of the clutch cover 2. A plurality of tags 2 a are provided in the circumferential direction on the inner peripheral portion of the clutch cover 2, and the tags 2 a are bent toward the flywheel 50 (left side in FIG. 1, hereinafter referred to as the engine side). The tip 2b of the tag 2a is bent radially outward after the wire ring 20, the diaphragm spring 4 and the wire ring 21 are assembled. In this way, the tag 2a supports the diaphragm spring 4.
[0026]
  The pressure plate 3 is an annular member having a pressing surface 3 a formed on the side facing the flywheel 50. Between the pressing surface 3a and the flywheel 50, a friction member 51 of the clutch disk assembly is disposed. Further, the pressure plate 3 is formed with a protruding portion 3b that protrudes in the direction of the axis OO on the side opposite to the pressing surface 3a. The pressure plate 3 has a plurality of connecting protrusions 3 c protruding to the outer peripheral side, and one end of the strap plate 6 is fixed to the connecting protrusion 3 c by a rivet 7. The strap plate 6 extends in the tangential direction of the pressure plate 3, and the other end is fixed to the clutch cover 2. That is, the pressure plate 3 is attached to the clutch cover 2 so as not to rotate relative to the clutch cover 2 and to be movable in the axis OO direction. The pressure plate 3 is urged away from the flywheel 50 by the urging force of the strap plate 6.
[0027]
  The diaphragm spring 4 is a disk-shaped member disposed between the pressure plate 3 and the clutch cover 2, and is supported by the clutch cover 2. The diaphragm spring 4 includes a pressing portion 11, a support portion 12 on the inner peripheral side of the pressing portion 11, and a plurality of lever portions 13 that extend radially inward from the support portion 12. Further, the diaphragm spring 4 has a slit between the lever portions 13, and a substantially trapezoidal hole 4a is formed in the outer peripheral portion of these slits.
[0028]
  The outer peripheral part of the press part 11 is contact | abutting to the protrusion part 3b of the pressure plate 3 (refer FIG. 1).
[0029]
  The support portion 12 is supported by the tag 2 a of the clutch cover 2 via the wirings 20 and 21.
[0030]
  The lever portion 13 includes an outer peripheral lever portion 13a on the outer peripheral side and an inner peripheral lever portion 13b on the inner peripheral side, and a rib 13c is formed in the central portion in the circumferential direction over the outer peripheral lever portion 13a and the inner peripheral lever portion 13b. Has been.
[0031]
  The outer peripheral lever portion 13 a is a portion sandwiched between adjacent holes 4 a in the lever portion 13 and is adjacent to the support portion 12.
[0032]
  The inner circumferential lever portion 13b is a portion of the lever portion 13 that extends from the outer circumferential lever portion 13a to the inner circumferential side, and the width becomes narrower toward the tip. The distal end portion (inner circumferential end portion) of the inner circumferential lever portion 13b is the distal end portion 13e, and the release member 52 contacts the distal end portion 13e.
[0033]
  The rib 13c is formed at a substantially central portion in the circumferential direction of the outer peripheral lever portion 13a and the inner peripheral lever portion 13b, and extends in the radial direction. The circumferential width of the rib 13c is slightly smaller than the circumferential width of the outer lever 13a.
[0034]
  As shown in FIGS. 3 and 4, the distal end portion 13 e includes an outer peripheral lever portion 13 a in which the ribs 13 are not formed and an inner peripheral lever portion 13 b in which the ribs 13 are not formed and the shaft OO. The position of the direction is on the raised portion 13d.
[0035]
  Thus, here, the raised portion 13 d of the rib 13 c continues to the inner peripheral end of the lever portion 13.
[0036]
  The wire ring 20, the inner peripheral portion of the pressing portion 11 of the diaphragm spring 4, and the wire ring 21 are sandwiched between the tip portion 2 b of the tag 2 a and the inner peripheral portion of the clutch cover 2. Thereby, the diaphragm spring 4 is supported by the clutch cover 2.
[0037]
  Next, the operation of the clutch cover assembly 1 will be described.
  In the clutch cover assembly 1, the clutch cover assembly 1 presses the friction member 51 of the clutch disk assembly between the pressure plate 3 and the flywheel 50 by the diaphragm spring 4. As a result, the flywheel 50 and the friction member 51 are pressed against each other, and torque from the flywheel 50 is transmitted to the clutch disc assembly. When releasing this pressure at the time of release, the distal end of the lever portion 13 of the diaphragm spring 4 is moved to the engine side by the release member 52, and the outer peripheral portion of the pressing portion 11 of the diaphragm spring 4 is opposite to the engine side with the wire ring 21 as a fulcrum. To the side (right side of FIG. 1, hereinafter referred to as transmission side). Then, the pressure plate 3 also moves to the transmission side by the urging force of the strap plate 6. As a result, the friction member 51 of the clutch disc assembly that is sandwiched between the flywheel 50 and the flywheel 50 and the pressure plate 3 is separated from and connected to the flywheel 50, and the transmission of torque is cut off.
[0038]
  In the conventional diaphragm spring, a rib is formed so as to raise the central portion of the lever portion, but no rib is formed over the entire radial direction of the lever portion. In particular, since the front end portion of the lever portion requires a flat portion on which the release member abuts, it is left flat without being processed such as rib formation.
[0039]
  In the diaphragm spring 4 of the present embodiment, the rib 13c is formed so as to continue to the inner peripheral side tip of the lever portion 13, and the release member 52 is brought into contact with the tip portion 13e on the raised portion 13d raised by the formation of the rib 13c. ing. Thereby, the bending rigidity of the lever part 13 is large compared with the conventional diaphragm spring which is the same in other structures.
[0040]
  Therefore, the amount of bending deformation per unit load of the lever portion 13 is reduced, the time loss of the movement of the pressing portion 11 of the diaphragm spring 4 with respect to the movement of the release member 52 is reduced, and the followability of the clutch device to the movement of the release member 52 is reduced. improves.
[0041]
  Further, even if the lever portion 13 of the diaphragm spring 4 is lengthened, it is possible to ensure the same bending rigidity, so that the lever ratio is increased without reducing the followability of the clutch device with respect to the movement of the release member 52. Therefore, the release load of the clutch device can be reduced, and the depression force of the clutch pedal can be reduced.
[0042]
  Here, the rib 13c having a flat top is formed on the lever portion 13 (see FIG. 5), but a rib having an arched cross section may be formed instead of the rib 13c. However, even in the case of forming the rib having a cross section in the arch shape, it is desirable that the surface with which the release member 52 abuts is a flat surface.
[0043]
  [Reference example 1]
  This exampleIn the first embodiment, the diaphragm spring 4 shown in FIGS. 6 to 8 is employed instead of the diaphragm spring 4 shown in FIGS. 3 to 5 of the first embodiment. In the following description, the same reference numerals as those in the first embodiment denote the same or similar members.
[0044]
  This exampleThe diaphragm spring 4 includes a pressing portion 11, a support portion 12 on the inner peripheral side of the pressing portion 11, and a plurality of lever portions 13 extending radially inward from the support portion 12. Further, the diaphragm spring 4 has a slit between the lever portions 13, and a substantially trapezoidal hole 4a is formed in the outer peripheral portion of these slits.
[0045]
  The lever portion 13 includes an outer peripheral lever portion 13a on the outer peripheral side and an inner peripheral lever portion 13b on the inner peripheral side, and has a shape in which both end portions in the circumferential direction are bent.
[0046]
  The outer peripheral lever portion 13 a is a portion sandwiched between adjacent holes 4 a in the lever portion 13 and is adjacent to the support portion 12.
[0047]
  The inner circumferential lever portion 13b is a portion of the lever portion 13 that extends from the outer circumferential lever portion 13a to the inner circumferential side, and the width becomes narrower toward the tip. The release member 52 abuts on the tip portion (inner peripheral end portion) of the inner peripheral lever portion 13b. The circumferential width of the outer peripheral portion of the inner peripheral lever portion 13b is larger than the circumferential width of the outer peripheral lever portion 13a. Both end portions in the circumferential direction of the outer peripheral portion of the inner peripheral lever portion 13b are bent as shown in FIGS. 7 and 8, whereby two bent portions 13f are formed in each inner peripheral lever portion 13b. Will be.
[0048]
  About another structure, it is the same as that of 1st Embodiment. In the conventional diaphragm spring, no particular device for improving the rigidity is provided for a portion of the outer peripheral portion of the inner peripheral lever portion that is wider than the circumferential width of the outer peripheral lever portion.
[0049]
  This exampleIn the diaphragm spring 4, the inner peripheral lever portion 13 b is processed so as to bend both end portions in the circumferential direction to form a bent portion 13 f. For this reason, the bending rigidity of the inner periphery lever part 13b becomes large compared with the conventional diaphragm spring in which another structure is the same. Therefore, the amount of bending deformation per unit load of the lever portion 13 is reduced, the time loss of the movement of the pressing portion 11 of the diaphragm spring 4 with respect to the movement of the release member 52 is reduced, and the followability of the clutch device to the movement of the release member 52 is reduced. improves.
[0050]
  [No.2Embodiment]
  In the present embodiment, the diaphragm spring 4 shown in FIGS.Reference example 1The diaphragm spring 4 in which the bent portion 13f employed in the diaphragm spring 4 shown in FIGS. 6 to 8 is further formed is employed. The diaphragm spring 4 of this embodiment is shown in FIGS.
[0051]
  The lever portion 13 of the diaphragm spring 4 of the present embodiment is formed with a bent portion 13f in addition to the rib 13c, as shown in FIGS. As a result, the firstEmbodiment or Reference Example 1The bending rigidity of the lever part 13 is larger than that of the lever part 13.
[0052]
  [No.3Embodiment] The above firstAnd secondThe diaphragm spring described in the embodiment is used in the clutch cover assembly 1 for a push-type clutch device. The present invention in which a rib 13c and a bent portion 13f are formed on a lever portion 13 is a pull-type clutch. It can also be employed for a clutch cover assembly for a device. In the following description, the same reference numerals as those in the first embodiment denote the same or similar members.
[0053]
  A clutch cover assembly 31 shown in FIG. 12 is for a pull-type clutch device, and mainly includes a clutch cover 2, a pressure plate 3, and a diaphragm spring 8.
[0054]
  The clutch cover 2 is a substantially dish-shaped plate member, and an outer peripheral portion thereof is fixed to the flywheel 50 by, for example, a bolt.
[0055]
  The pressure plate 3 is an annular member having a pressing surface 3 a formed on the side facing the flywheel 50. The pressure plate 3 has a protruding portion 3b that protrudes in the direction of the axis OO on the side opposite to the pressing surface 3a.
[0056]
  The diaphragm spring 8 is a disk-shaped member disposed between the pressure plate 3 and the clutch cover 2, and is supported by the clutch cover 2 via a wire ring 40. The diaphragm spring 8 includes a support portion 81, a pressing portion 82 on the inner peripheral side of the support portion 81, and a plurality of lever portions 13 that extend radially inward from the pressing portion 82. Further, the diaphragm spring 8 has a slit between the lever portions 13, and a substantially trapezoidal hole 4a is formed in the outer peripheral portion of these slits.
[0057]
  The support portion 81 is supported by the clutch cover 2 via the wiring 40 (see FIG. 12), and movement to the transmission side is restricted.
[0058]
  The pressing portion 82 has a surface on the engine side in contact with the protruding portion 3 b of the pressure plate 3, and a surface on the transmission side in contact with the tip of the clip 41. The clip 41 is fixed to the pressure plate 3 by bolts 42 and restricts relative movement of the pressing portion 82 of the diaphragm spring 8 and the pressure plate 3 along the axis OO direction.
[0059]
  About the structure of the lever part 13, it is the same as that of 1st Embodiment. However, in the first embodiment, the release member 52 is in contact with the distal end portion 13e from the transmission side, whereas in the present embodiment, the release member 53 is in contact with the distal end portion 13e from the engine side. About another structure, it is the same as that of 1st Embodiment.
[0060]
  Next, the operation of the clutch cover assembly 31 will be described.
  In the clutch engaged state, the clutch cover assembly 31 presses the friction member 51 of the clutch disk assembly between the pressure plate 3 and the flywheel 50 by the diaphragm spring 8. As a result, the flywheel 50 and the friction member 51 are pressed against each other, and torque from the flywheel 50 is transmitted to the clutch disc assembly. When releasing the pressure at the time of release, the tip of the lever portion 13 of the diaphragm spring 8 is moved to the transmission side by the release member 53, and the pressing portion 82 of the diaphragm spring 8 is moved to the transmission side with the wire ring 40 as a fulcrum. Then, it is pulled by the clip 41 and the pressure plate 3 also moves to the transmission side. As a result, the friction member 51 of the clutch disc assembly that is sandwiched between the flywheel 50 and the flywheel 50 and the pressure plate 3 is separated from and connected to the flywheel 50, and the transmission of torque is cut off.
[0061]
  About the effect by having formed the rib 13c in the diaphragm spring 8 as described in this embodiment, it is the same as that of 1st Embodiment.
[0062]
  [Reference example 2]
  Above3Instead of the lever portion 13 of the diaphragm spring 8 shown in FIGS. 12 and 13 of the embodiment, the structure of the lever portion 13 as shown in FIGS. 6 to 8 may be employed. The structure of the lever portion 13 is as described above.Reference example 1It is the same.
[0063]
  This exampleHowever, since both ends of the inner circumferential lever portion 13b are bent so as to form a bent portion 13f, the inner circumference of the inner circumferential lever portion 13b is similar to that of a conventional diaphragm spring having the same structure. The bending rigidity of the lever portion 13b is increased. Therefore, the amount of bending deformation per unit load of the lever portion 13 is reduced, the time loss of the movement of the pressing portion 11 of the diaphragm spring 4 with respect to the movement of the release member 53 is reduced, and the clutch device can follow the movement of the release member 53. improves.
[0064]
  [No.4Embodiment]
  Above3Instead of the lever portion 13 of the diaphragm spring 8 shown in FIGS. 12 and 13 of the embodiment, a structure of the lever portion 13 as shown in FIGS. 9 to 11 may be employed. The structure of the lever portion 13 is as described above.2This is the same as the embodiment.
[0065]
  In the lever portion 13 of the present embodiment, a bent portion 13f is formed in addition to the rib 13c. by this, YoThe bending rigidity of the lever portion 13 is increased.
[0066]
【The invention's effect】
  In the present invention, the rib of the lever portion is formed so as to continue to the tip on the inner peripheral side, orIn conjunction with thisSince the rigidity of the lever portion is enhanced by bending both circumferential end portions of the inner peripheral lever portion of the lever portion, the followability of the clutch device to the movement of the release member is improved, or the clutch device to the movement of the release member The release load of the clutch device can be reduced by elongating the lever portion without reducing the followability of the clutch device.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a clutch device including a clutch cover assembly according to a first embodiment of the present invention.
FIG. 2 is a plan view of a diaphragm spring according to the first embodiment.
FIG. 3 is a partially enlarged view of the diaphragm spring of the first embodiment.
4 is a view taken along arrow IV-IV in FIG. 3;
5 is a VV cross-sectional view of FIG.
[Fig. 6]Reference example 1The partial enlarged view of a diaphragm spring.
7 is a view taken along arrow VII-VII in FIG. 6;
8 is a cross-sectional view taken along the line VIII-VIII in FIG.
FIG. 92The elements on larger scale of the diaphragm spring of embodiment.
10 is a view taken in the direction of arrows XX in FIG. 9;
11 is a sectional view taken along line XI-XI in FIG.
FIG. 12 shows the first of the present invention.3The longitudinal cross-sectional view of the clutch apparatus containing the clutch cover assembly by embodiment.
FIG. 133The elements on larger scale of the diaphragm spring of embodiment.
FIG. 14 is a partially enlarged view of a conventional diaphragm spring.
15 is an XV-XV arrow view of FIG.
16 is a cross-sectional view taken along XVI-XVI in FIG.
[Explanation of symbols]
1 Clutch cover assembly
2 Clutch cover
3 Pressure plate
4,8 Diaphragm spring
11, 82 Press part
12, 81 support part
13 Lever part
13a Peripheral lever part
13b Inner lever part
13c rib
13f bent part
50 Flywheel (drive member)
51 Clutch disc (driven member)
52,53 Release members

Claims (5)

A diaphragm spring of a clutch cover assembly that is mounted on a driving member together with a clutch cover and presses a driven member against the driving member via a pressure plate in conjunction with the release member,
A support portion supported by the clutch cover;
A pressing portion that is formed on an outer peripheral side of the support portion and presses the pressure plate against the driven member;
A plurality of lever portions extending from the support portion to the inner peripheral side, the inner peripheral side tip portion contacting the release member;
With
The lever portion is formed with a rib that extends in a radial direction continuously to the inner circumferential end of the lever portion and has a width wider than a circumferential width of the inner circumferential tip.
Said lever portion, said planar portion raised from the portion which is not formed of the rib by forming ribs is formed, the release member abuts on the planar portion,
Diaphragm spring. A diaphragm spring of a clutch cover assembly that is mounted on a driving member together with a clutch cover and presses a driven member against the driving member via a pressure plate in conjunction with the release member,
A support portion supported by the clutch cover;
A pressing portion that is formed on an outer peripheral side of the support portion and presses the pressure plate against the driven member;
An inner circumferential lever portion with an inner circumferential end abutting against the release member, and a circumferential width narrower than a circumferential width of an outer circumferential end of the inner circumferential lever portion, the inner circumferential lever portion A plurality of lever portions having an outer peripheral lever portion connecting an outer peripheral end and the support portion, and extending from the support portion to an inner peripheral side;
With
Both end portions in the circumferential direction of the inner peripheral lever portion of the lever portion are bent, and the lever portion extends in the radial direction continuously to the inner peripheral side tip of the lever portion and the inner peripheral side tip portion Ribs having a width wider than the width in the circumferential direction are formed,
Said lever portion, said planar portion raised from the portion which is not formed of the rib by forming ribs is formed, the release member abuts on the planar portion,
Diaphragm spring. A diaphragm spring of a clutch cover assembly that is mounted on a driving member together with a clutch cover and presses a driven member against the driving member via a pressure plate in conjunction with the release member,
A support portion supported by the clutch cover;
A pressing portion that is formed on the inner peripheral side of the support portion and presses the pressure plate against the driven member;
A plurality of lever portions extending from the pressing portion to the inner peripheral side, the inner peripheral side front end portion being in contact with the release member;
With
Of the inner circumferential lever portion of the lever portion, both ends in the circumferential direction are bent,
The lever portion is formed with a rib that extends in a radial direction continuously to the inner circumferential end of the lever portion and has a width wider than a circumferential width of the inner circumferential tip.
Said lever portion, said planar portion raised from the portion which is not formed of the rib by forming ribs is formed, the release member abuts on the planar portion,
Diaphragm spring. A diaphragm spring of a clutch cover assembly that is mounted on a driving member together with a clutch cover and presses a driven member against the driving member via a pressure plate in conjunction with the release member,
A support portion supported by the clutch cover;
A pressing portion that is formed on the inner peripheral side of the support portion and presses the pressure plate against the driven member;
An inner circumferential lever portion with an inner circumferential end abutting against the release member, and a circumferential width narrower than a circumferential width of an outer circumferential end of the inner circumferential lever portion, the inner circumferential lever portion A plurality of lever portions having an outer peripheral lever portion connecting an outer peripheral end and the support portion, and extending from the pressing portion toward an inner peripheral side;
With
Of the inner circumferential lever portion of the lever portion, both ends in the circumferential direction are bent,
The lever portion is formed with a rib that extends in a radial direction continuously to the inner circumferential end of the lever portion and has a width wider than a circumferential width of the inner circumferential tip.
Said lever portion, said planar portion raised from the portion which is not formed of the rib by forming ribs is formed, the release member abuts on the planar portion,
Diaphragm spring. A clutch cover assembly for pressing or releasing the driven member against the driving member,
A clutch cover fixed to the drive member;
A pressure plate disposed on the inner peripheral side of the clutch cover so as not to rotate relative to the clutch cover and to be movable in the axial direction;
The diaphragm spring according to any one of claims 1 to 4, which is supported by the clutch cover;
A clutch cover assembly comprising:

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