JP2010236629A - Torque limiter mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque limiter mechanism capable of suppressing the lowering of limiter torque by suppressing the attachment of foreign matters and oil to friction engagement surfaces. <P>SOLUTION: The torque limiter mechanism 20 to limit the transmission of excessive torque from an internal combustion engine to a transmission belongs to a torque variation absorbing mechanism 10 installed between an output shaft 1 of the internal combustion engine and an input shaft 3 of the transmission, and the torque variation absorbing mechanism further includes a damper 36 to absorb a torque variation generated between the engine and the transmission. In addition, a shield member 27 is attached to a disc 35 which is located inside the friction engagement surfaces 21A and 22A and the friction engagement surfaces 25A and 26A and outside the damper 36, wherein a cover plate 21 and a limiter plate 22 have friction engagement surfaces, respectively, and friction members 25 and 26 having respective friction engagement surfaces are pinched and held by the plates 21 and 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a torque limiter mechanism that is disposed between a drive source and a transmission and restricts an excessive torque from being transmitted from the drive source to the transmission.

  Conventionally, such torque limiter mechanisms disclosed in Patent Documents 1 and 2 have been disclosed. Such a torque limiter mechanism is provided, for example, in the torque fluctuation absorbing mechanism 50 shown in FIG. The torque fluctuation absorbing mechanism 50 is disposed in a power transmission system between a flywheel 2 attached to the output shaft 1 of the internal combustion engine so as to be integrally rotatable and an input shaft 3 of the transmission, and at the outer periphery thereof. Bolts are fixed to the flywheel 2. The torque fluctuation absorbing mechanism 50 includes the above-described torque limiter mechanism 51 that limits transmission of excessive torque, and a damper that is provided on the inner peripheral side of the torque fluctuation mechanism 50 and absorbs torque fluctuation generated between the drive source and the transmission. And a member 52.

  The torque limiter mechanism 51 is fixed to the friction member 54 fixed to both surfaces of the outer peripheral portion of the disk 53 connected to the transmission, the cover plate 55 and the limiter plate 56 that sandwich the friction member 54, and the flywheel 2. The support plate 57 is arranged between the limiter plate 56 and the support plate 57 and presses the limiter plate 56 away from the support plate 57. The cover plate 55 is bolted to the flywheel 2 together with the support plate 57.

  With this configuration, when the transmission torque between the flywheel 2 side and the input shaft 3 side is equal to or less than a predetermined value, the torque of the flywheel 2 is transmitted to the input shaft 3 via the torque limiter mechanism 51 and the damper member 52. Is done. On the other hand, the transmission torque exceeds a predetermined value (limiter torque), so that the rotational torque of the plates 55 and 56 (flywheel 2) is applied to the friction engagement surface between the plates 55 and 56 and the friction member 54. When the holding force of the friction member 54 is exceeded, the friction member 54 rotates relative to the plates 55 and 56, and excessive torque transmission to the input shaft 3 is suppressed.

JP 2003-194095 A JP 2007-218346 A

  Here, when foreign matter or oil scatters from the peripheral members with respect to the torque limiter mechanism 51 described above, and such foreign matter or oil adheres to the friction engagement surface described above, the friction coefficient μ on the friction engagement surface decreases. Such a problem may occur. When the friction coefficient μ decreases in this way, the friction member 54 rotates relative to the plates 55 and 56 even when the transmission torque is less than a predetermined value, and the limiter torque decreases. There are concerns about the occurrence of inconvenience.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a torque limiter mechanism capable of suppressing a decrease in limiter torque by suppressing adhesion of foreign matter, oil, or the like to the friction engagement surface. Is to provide.

In the following, means for achieving the above object and its effects are described.
The invention according to claim 1 is provided on the outer peripheral side of a damper member that absorbs torque fluctuation generated between the drive source and the transmission and between the drive source and the transmission. A friction engagement surface of a first rotating body that is drivingly connected to the drive shaft and rotates integrally with the drive shaft, and a friction engagement surface of a friction member fixed to a second rotation body connected to the input shaft of the transmission. And the torque of the driving source is transmitted to the transmission, and when a transmission torque of a predetermined value or more is generated between the driving source and the transmission, In a torque limiter mechanism that restricts excessive torque from being transmitted from the drive source to the transmission due to relative rotation of the friction member with respect to a friction engagement surface, friction engagement of the first rotating body is achieved. Inside the surface and the friction engagement surface of the second rotating body It is summarized as the shielding member to the second rotating member at the outer side of the side and the damper member is attached.

  According to the said structure, the shielding member is attached to the 2nd rotary body in an inner peripheral side rather than the friction engagement surface of a 1st rotary body, and a friction engagement surface of a 2nd rotary body, and an outer peripheral side rather than a damper member. Therefore, it is possible to suppress the scattering of foreign matter and oil with respect to the friction engagement surface, and it is possible to suppress the adhesion of such foreign matter and oil to the friction engagement surface. Therefore, when the transmission torque between the drive source and the transmission is less than the predetermined value, it is possible to suppress the relative rotation of the friction member, and it is possible to suppress the limiter torque from being lowered. become.

1 is a sectional view showing a torque fluctuation absorbing mechanism to which the torque limiter mechanism according to an embodiment of the present invention is applied and a peripheral configuration thereof; FIG. The enlarged view which shows the inside of the dashed-dotted line of FIG. Sectional drawing which shows the torque fluctuation absorption mechanism to which the conventional limiter mechanism was applied.

  Hereinafter, an embodiment embodying a torque limiter mechanism according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a cross-sectional view of a torque fluctuation absorbing mechanism 10 to which a torque limiter mechanism 20 according to the present invention is applied and its peripheral configuration. A torque fluctuation absorbing mechanism 10 shown in FIG. 1 is disposed between a flywheel 2 attached to an output shaft 1 of an internal combustion engine (drive source) so as to be integrally rotatable and an input shaft 3 of the transmission, The outer peripheral part is fixed to the flywheel 2 by bolts 4 arranged at predetermined angles.

  A disc-shaped hub 30 is provided at the center of the torque fluctuation absorbing mechanism 10. The hub 30 includes a boss portion 30A extending in the axial direction at the central portion thereof, and a disk-shaped plate portion 30B integrally formed with the boss portion 30A on the outer peripheral side thereof. A spline is formed on the inner peripheral surface of the boss portion 30A, and the hub 30 and the input shaft 3 rotate together by engaging the spline and the spline formed on the outer peripheral surface of the input shaft 3. To do.

  A first side plate 31 and a second side plate 32 are respectively provided on both axial sides of the plate portion 30B of the hub 30. These side plates 31 and 32 are formed by rivets 34 at predetermined angles on the outer peripheral portion thereof. They are fixed to each other. And the damper member 36 comprised by the coil spring is arrange | positioned at the hole respectively formed in the position corresponding to every predetermined angle of these hub 30 and the side plates 31 and 32. As shown in FIG. The damper member 36 transmits the rotational torque on the flywheel 2 side to the input shaft 3 side while absorbing torque fluctuation generated between the internal combustion engine and the transmission.

  Between the hub 30 and the first side plate 31 and between the hub 30 and the second side plate 32 on the outer peripheral side of the boss portion 30A, between the hub 30 and the side plates 31, 32. Hysteresis mechanisms 33 for generating hysteresis are respectively provided.

  Further, a substantially annular disk 35 is provided on the outer periphery side of the damper member 36 in the hub 30 and the side plates 31 and 32. The disc 35 is fixed by the rivets 34 after the inner periphery thereof is sandwiched between the side plates 31 and 32. This disk 35 corresponds to a second rotating body connected to the input shaft 3 of the transmission.

Next, the torque limiter mechanism 20 in this embodiment will be described with reference to FIG.
The torque limiter mechanism 20 includes a friction member 25 fixed to the internal combustion engine side surface at the outer peripheral portion of the disk 35 and a friction member 26 fixed to the transmission side surface. The pair of friction members 25 and 26 is sandwiched between a pair of plates such as a cover plate 21 that is in contact with the friction member 26 side and fixed to the flywheel 2 with bolts 4 and a limiter plate 22 that is in contact with the friction member 25 side. The The cover plate 21 and the limiter plate 22 correspond to a first rotating body that is drivingly connected to the output shaft 1 and rotates integrally with the output shaft 1.

  A disc spring 24 is disposed between the support plate 23 fixed to the flywheel 2 together with the cover plate 21 and the limiter plate 22 to press the limiter plate 22 away from the support plate 23. Yes. With this configuration, when the transmission torque between the internal combustion engine and the transmission is equal to or less than the predetermined value α, the frictional engagement surface 21A of the cover plate 21 and the frictional engagement surface 26A of the friction member 26 are pressed against each other, and the limiter plate The frictional engagement surface 22A of 22 and the frictional engagement surface 25A of the friction member 25 are pressed against each other. The predetermined value α (limiter torque) corresponding to the maximum torque transmitted from the internal combustion engine to the transmission is the urging force of the disc spring 24 and the friction coefficient at the friction engagement surfaces 21A, 22A, 25A, and 26A. μ and the working diameter (limiter torque = spring biasing force × friction coefficient μ × working diameter).

  Further, a pair of shielding members 27 formed in a disk shape are provided on the disk 35 on the inner peripheral side of the friction engagement surfaces 21A, 22A, 25A, and 26A and on the outer peripheral side of the damper member 36. Attached to both sides in the axial direction and fixed by rivets 28.

  The shielding member 27 extends along the disk 35 on the inner peripheral side thereof, and has an annular portion 27A having a through portion through which the rivet 28 penetrates, and extends so as to be separated from the disk 35 toward the outer peripheral side on the outer peripheral side thereof. And an arc portion 27B provided. More specifically, the arc portion 27B is formed such that the cross-sectional shape along the axial direction (the shape shown in FIG. 2) is a substantially arc shape, and the inner side of the outer end portion on the cover plate 21 side and the disc 35 The distance Da along the axial direction is formed to be larger than the distance Db between the outer surface of the cover plate 21 and the disk 35 along the axial direction. Similarly, the distance Dc along the axial direction between the inner side of the outer end on the limiter plate 22 side and the disk 35 in the arc portion 27B is along the axial direction between the outer surface of the limiter plate 22 and the disk 35. It is formed so as to be larger than the distance Dd.

  The torque limiter mechanism 20 in the present embodiment includes the above-described cover plate 21, limiter plate 22, support plate 23, disc spring 24, friction members 25 and 26, a disk 35, a pair of shielding members 27, a rivet 28, and the like. Configured.

Next, operations of the torque fluctuation absorbing mechanism 10 and the torque limiter mechanism 20 configured as described above will be described.
When the flywheel 2 rotates with the rotation of the output shaft 1 of the internal combustion engine, this rotational torque is transmitted to the disk 35 via the torque limiter mechanism 20. Specifically, when the transmission torque between the flywheel 2 side and the input shaft 3 side is equal to or smaller than a predetermined value α (limiter torque), the friction members 25 and 26 are held by the cover plate 21 and the limiter plate 22. As a result, the friction engagement surface 25A of the friction member 25 and the friction engagement surface 22A of the limiter plate 22 are pressed against each other, and the friction engagement surface 26A of the friction member 26 and the friction engagement surface 21A of the cover plate 21 are pressed against each other. The As a result, the friction members 25 and 26 together with the cover plate 21 and the limiter plate 22 rotate around the axis, whereby the rotational force of the output shaft 1 is transmitted to the disk 35.

  On the other hand, when the transmission torque between the flywheel 2 side and the input shaft 3 side reaches a predetermined value α (limiter torque), the rotational torque of the flywheel 2, that is, the rotational torque of the cover plate 21 and the limiter plate 22, The holding force along the rotational direction of the friction members 25 and 26 by the plates 21 and 22 is reached. When the transmission torque exceeds a predetermined value α (limiter torque), the friction members 25 and 26 rotate relative to the plates 21 and 22, and transmission of rotational torque exceeding the predetermined value α is limited. Is done. Thereby, transmission of excessive torque from the internal combustion engine to the transmission is restricted, and transmission of excessive torque to the input shaft 3 is suppressed.

  When the rotational torque of the output shaft 1 is thus transmitted to the disk 35, this rotational torque is transmitted to the input shaft 3 via the side plates 31, 32, the damper member 36, the hysteresis mechanism 33, and the hub 30.

Here, in the present embodiment, since the above-described torque limiter mechanism 20 is provided with the shielding member 27, the following operational effects can be achieved.
(1) Since the shielding member 27 is attached to the disk 35 on the inner peripheral side with respect to the friction engagement surfaces 21A, 22A, 25A, and 26A and on the outer peripheral side with respect to the damper member 36, the friction engagement surfaces 21A from the peripheral members. , 22A, 25A, and 26A can be separated along the shielding member 27, and the foreign matter and oil can adhere to the frictional engagement surfaces 21A, 22A, 25A, and 26A. Can be suppressed. Therefore, it is possible to suppress a decrease in the friction coefficient μ on the friction engagement surfaces 21A, 22A, 25A, and 26A due to adhesion of foreign matter, oil, or the like. Thereby, when the transmission torque between the internal combustion engine and the transmission is less than a predetermined value α (limiter torque), the friction members 25 and 26 are prevented from rotating relative to the cover plate 21 and the limiter plate 22. Will be able to. That is, it is possible to suppress the limiter torque from being lowered in the torque limiter mechanism 20, and the limiter torque can be stably maintained.

  (2) Since a simple member such as the shielding member 27 is attached to the disk 35, an effect of suppressing the decrease in the limiter torque can be obtained. Therefore, the torque limiter mechanism 20 having such an effect can be easily realized.

  (3) The shielding member 27 is a member provided on the outer peripheral side (friction members 25, 26, plates 21, 22, etc.) or a member provided on the inner peripheral side (side plates 31, 32, damper member 36). Etc.) without contact. Therefore, it is possible to obtain an effect of suppressing the decrease in the limiter torque while suppressing an increase in vehicle noise and vibration due to the arrangement of the shielding member 27.

  (4) The shielding member 27 is provided on the inner peripheral side of the friction engagement surfaces 21A, 22A, 25A, and 26A. Therefore, foreign matter, oil, or the like scattered from the inner peripheral side to the outer peripheral side with the generation of centrifugal force during engine operation can be separated from the friction engagement surfaces 21A, 22A, 25A, and 26A along the shielding member 27. . Therefore, it is possible to efficiently suppress foreign matters, oil, and the like from adhering to the friction engagement surfaces 21A, 22A, 25A, and 26A during engine operation.

  (5) The shielding member 27 is formed in a disk shape, and is continuously disposed in the vicinity of the friction engagement surfaces 21A, 22A, 25A, and 26A. Therefore, when the engine is stopped, foreign matter or oil falling from above the torque limiter mechanism 20 also follows the shielding member 27 from the frictional engagement surfaces 21A, 22A, 25A, 26A arranged below the shielding member 27. Can be separated. Therefore, even when the engine is stopped, adhesion of foreign matter, oil, or the like to the friction engagement surfaces 21A, 22A, 25A, and 26A can be suppressed.

(Other embodiments)
The torque limiter mechanism according to the present invention is not limited to the configuration exemplified in the above embodiment, and can be implemented in the following form, for example, which is appropriately modified from the embodiment.

  The shape of the shielding member 27 shown in the above embodiment is an example, and the shape is appropriately changed as long as it is a shape that can suppress adhesion of foreign matter, oil, and the like to the friction engagement surfaces 21A, 22A, 25A, and 26A. be able to. Specifically, the shape of the shielding member 27 is such that the distance along the axial direction between the outer side of the outer end portion on the cover plate 21 (limiter plate 22) side and the disk 35 is the inner side of the cover plate 21 (limiter plate 22). By setting so as to be larger than the distance along the axial direction between the surface and the disk 35, it is possible to suppress adhesion of foreign matter, oil, etc. to the friction engagement surfaces 21A, 22A, 25A, 26A. Become.

  DESCRIPTION OF SYMBOLS 1 ... Output shaft (drive shaft), 2 ... Flywheel, 3 ... Input shaft, 4 ... Bolt, 10, 50 ... Torque fluctuation absorption mechanism, 20, 51 ... Torque limiter mechanism, 21, 55 ... Cover plate (1st rotation) Body), 21A, 22A, 25A, 26A ... friction engagement surface, 22, 56 ... limiter plate (first rotating body), 23, 57 ... support plate, 24, 58 ... disc spring, 25, 26, 54 ... friction 27, shielding member, 27A, circular portion, 27B, arc portion, 28, 34, rivet, 30, hub, 30A, boss portion, 30B, plate portion, 31 first side plate, 32 second side. Plate, 33 ... Hysteresis mechanism, 35, 53 ... Disc (second rotating body), 36, 52 ... Damper member.

Claims (1)

Provided between the drive source and the transmission, on the outer peripheral side of a damper member that absorbs torque fluctuations generated between the drive source and the transmission, and is driven and connected to the drive shaft of the drive source. The friction engagement surface of the first rotating body that rotates integrally with the shaft and the friction engagement surface of the friction member that is fixed to the second rotation body that is coupled to the input shaft of the transmission are in pressure contact with each other in the axial direction. When the torque of the driving source is transmitted to the transmission and a transmission torque of a predetermined value or more is generated between the driving source and the transmission, the friction with respect to the friction engagement surface of the first rotating body is generated. In a torque limiter mechanism that restricts excessive torque from being transmitted from the drive source to the transmission due to relative rotation of the members,
A shielding member is attached to the second rotating body on the inner peripheral side of the friction engagement surface of the first rotating body and the friction engaging surface of the second rotating body and on the outer peripheral side of the damper member. A featured torque limiter mechanism.

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