JP6006862B2 - Multi-disc transmission - Google Patents

Description

  The present invention relates to a multi-disc transmission.

  In JP2010-53995A, a primary disk provided on the input shaft and a secondary disk provided on the output shaft are partially overlapped to provide a disk overlap area, and both disks are sandwiched between a pair of pressing rollers in this area. A multi-disc transmission that transmits the rotation of an input shaft to an output shaft by bringing them into contact is disclosed.

  In a multi-disc transmission, a shift is realized by changing a position where a pair of pressing rollers sandwich both discs. That is, if the position between the two disks is close to the input shaft, the gear ratio changes to the low side (large gear ratio side), and if close to the output shaft, the gear ratio changes to the high side (low gear ratio side). .

  In the multi-disc transmission, the pressing roller brings the primary disc and the secondary disc into contact with each other, and transmits torque by the frictional force generated at the contact portion. Therefore, if a portion other than the torque transmission contact portion that should be contacted comes into contact, there is a problem that the torque transmission efficiency is reduced due to frictional resistance.

  The present invention has been made in view of such a technical problem, and an object thereof is to suppress a decrease in torque transmission efficiency due to frictional resistance.

According to an aspect of the present invention, there is provided a multi-disc transmission, an input shaft to which rotation from a power source is input, an output shaft disposed in parallel to the input shaft, and the input shaft. A primary disk, a secondary disk provided on the output shaft and having a disk overlapping area overlapping the primary disk, and a pair of pressing rollers disposed on both sides of the primary disk and the secondary disk in the disk overlapping area A shift actuator that moves the pair of pressing rollers between the input shaft and the output shaft, and a pressing mechanism that presses the pair of pressing rollers against the primary disk and the secondary disk, At least one of the primary disk and the secondary disk is plural While being configured in a disc disposed across the other, disposed at a position away from the primary disk and axial center plane perpendicular to as the output shaft of the output shaft in all disks of the secondary disk A multi-disc transmission is provided that has a greater warpage in a direction away from the orthogonal plane as the disc is more.

FIG. 1 is an overall schematic view of a vehicle equipped with a multi-disc transmission. FIG. 2 is a view of the multi-disc transmission as viewed from the engine side. FIG. 3 is a bottom view of FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 6 is a diagram showing a disk overlap area. FIG. 7 is a diagram illustrating a state where a torque transmission contact portion is formed in the VII-VII cross section of FIG. 6.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an overall schematic view of a vehicle including a multi-disc transmission according to an embodiment of the present invention.

  The vehicle 1 includes an engine 2 as a power source, a multi-disc transmission (hereinafter referred to as a transmission) 3, left and right drive shafts 4 and 5, and left and right drive wheels 6 and 7.

  The transmission 3 includes a transmission case 9, an input shaft 10, a primary disk 11, a secondary disk 12, a pressing mechanism 13, an output shaft 14, a dry start clutch 15, a reverse gear 16, and a reverse idler gear. 17, an output gear 18, a synchronization mechanism 19, a final gear 20, and a differential gear unit 21.

  The input shaft 10 and the output shaft 14 are arranged in parallel and are rotatably supported by the transmission case 9.

  FIG. 2 is a view of the transmission 3 as viewed from the engine 2 side. FIG. 3 is a bottom view of FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. In addition, about drawing after FIG. 2, a part of member is abbreviate | omitted for description.

  The primary disk 11 is configured by arranging two circular disks 11 a in the axial direction of the input shaft 10 and attaching them to the input shaft 10, and rotates integrally with the input shaft 10. A spacer 22 is provided between the two disks 11 a, and the two disks 11 a are arranged at a predetermined interval in the axial direction of the input shaft 10 by the spacer 22. The primary disk 11 is arranged so that the outer peripheral end of the disk 11 a is close to the output shaft 14. The primary disk 11 rotates with the input shaft 10 in the direction of the arrow in FIG. The primary disk 11 is a disk formed so that the outer peripheral side is warped over the entire circumference. The shape of the primary disk 11 will be described in detail later.

  The secondary disk 12 includes a center disk 12a and two side disks 12b provided facing both sides of the center disk 12a. The secondary disk 12 is configured by arranging a center disk 12 a and a side disk 12 b in the axial direction of the output shaft 14 and attaching to the output shaft 14, and rotates integrally with the output shaft 14. A spacer 23 is provided between the center disk 12a and the side disk 12b, and the center disk 12a and the side disk 12b are arranged with a predetermined distance in the axial direction of the output shaft 14 by the spacer 23. The secondary disk 12 is arranged so that the outer peripheral end of the center disk 12 a and the outer peripheral end of the side disk 12 b are close to the input shaft 10. The secondary disk 12 is a disk formed so that the outer peripheral side is warped over the entire circumference. The shape of the secondary disk 12 will be described in detail later.

  The disk 11a of the primary disk 11 is disposed between the center disk 12a of the secondary disk 12 and the side disk 12b. The primary disk 11 and the secondary disk 12 form a disk overlap region where a part of the disk overlaps between the input shaft 10 and the output shaft 14.

  In the disk overlapping area, a gap is formed between the disk 11a of the primary disk 11 and the center disk 12a in a state where the pressing force by the pressing mechanism 13 described in detail below does not act.

  On the other hand, in the situation where the pressing force by the pressing mechanism 13 is applied, the primary disk 11 and the secondary disk 12 are elastically deformed and contacted to form a torque transmission contact portion. In the transmission 3, the transmission of rotation from the input shaft 10 to the output shaft 14 is realized by forming a torque transmission contact portion between the primary disk 11 and the secondary disk 12. The axis connection line O is a line that connects the axis of the input shaft 10 and the axis of the output shaft 14 and is orthogonal to the input shaft 10 and the output shaft 14. The torque transmission contact portion will be described later in detail.

  The pressing mechanism 13 includes a pair of pressing roller mechanisms 30, a pair of disk clamp mechanisms 31, a pressing force adjusting mechanism 32, and a first actuator 33.

  The first actuator 33 moves the pressing roller mechanism 30 along the axis connection line O.

  The first actuator 33 includes an electric motor 34, a ball screw mechanism 35, and a bracket 37.

  One end of the ball screw mechanism 35 is coupled to the rotating shaft of the electric motor 34 and rotates in the forward direction or the reverse direction depending on the rotating direction of the rotating shaft of the electric motor 34. The ball screw mechanism 35 is extended in the direction of the axis connection line O.

  When the ball screw mechanism 35 rotates, the bracket 37 moves along the axial direction of the ball screw mechanism 35, that is, the direction of the axial center connection line O according to the rotation of the ball screw mechanism 35. The bracket 37 is formed with a tapered surface 37a on the surface on the engine 2 side, the distance from the ball screw mechanism 35 becomes shorter toward the electric motor 34 side. When the bracket 37 is reciprocated by the electric motor 34, a push rod (not shown) that follows a tapered surface 37a like a so-called cam follower is reciprocated, and the release lever of the dry start clutch 15 is driven by the push rod. The clutch is engaged and released.

  The bracket 37 is connected to the second support portion 44 and the roller follower support block 48 of the pressing roller mechanism 30 via a first shaft 38 that extends in the direction of the axis connection line O. When the ball screw mechanism 35 is rotated by the electric motor 34, the bracket 37 moves back and forth along the direction of the axis connection line O according to the rotation direction of the ball screw mechanism 35, and the pressing roller mechanism 30 moves to the bracket 37 and the first. It is integrated with the shaft 38 and moves back and forth along the direction of the axis connection line O.

  5 is a cross-sectional view taken along the line VV in FIG.

  The pressing roller mechanism 30 includes a pressing roller 40, a holding portion 41, a pressing roller shaft 42, a first support portion 43, a second support portion 44, a support block 46, and a first roller follower 47.

  The pair of pressing roller mechanisms 30 are disposed on both sides of the primary disk 11 and the secondary disk 12 and are attached to the guide block 49. The guide block 49 is slidably supported by two guide shafts 51 provided between the two guide shaft blocks 50 attached to the transmission case 9 and extending in the direction of the axis connection line O. In other words, the pressing roller mechanism 30 is slidably supported by the guide shaft 51 via the guide block 49, moves in the direction of the axis connection line O by the first actuator 33, and transmits torque to a position corresponding to the target gear ratio. A contact portion is formed.

  The pressing roller shaft 42 extends in a direction intersecting with the direction of the axis connection line O, one end portion 42 a is supported by the first support portion 43, and the other end portion 42 b is supported by the second support portion 44. Is done. The pressing roller shaft 42 has a spherical end portion 42 b supported by the second support portion 44. A holding portion 41 that supports the pressing roller 40 is attached to the pressing roller shaft 42 between the first support portion 43 and the second support portion 44.

  The first support portion 43 is rotatably supported by the guide block 49 via a rotation shaft 52 provided in parallel with the guide shaft 51. The first support portion 43 supports one end portion 42 a of the pressing roller shaft 42 via the needle bearing 53.

  The second support portion 44 supports the other end portion 42 b of the pressing roller shaft 42 via the support block 46 and the needle bearing 54. A bush 55 having a spherical tip 55a is provided between the second support portion 44 and the support block 46 in the axial direction of the input shaft 10, and a gap is provided between the second support portion 44 and the support block 46. Is formed. The gap in the axial direction of the input shaft 10 is positioned closer to the primary disk 11 than the bush 55, and the tip 55 a of the bush 55 contacts the support block 46. The second support portion 44 is connected to the end portion of the second shaft 56 that extends in the direction of the axis connection line O and the direction orthogonal to the axial direction of the input shaft 10 and to which the first roller follower 47 is attached. The second support portion 44 moves in the axial direction of the input shaft 10 by a pressing force applied to the first roller follower 47. According to the movement of the second support portion 44 in the axial direction of the input shaft 10, the first support portion 43 and the holding portion 41 that supports the pressing roller 40 rotate about the rotation shaft 52.

  The first support portion 43 is provided so as to form a gap between the needle bearing 53 and the pressing roller shaft 42 in the direction of the axis connection line O. The end portion 42 b of the pressing roller shaft 42 supported by the second support portion 44 has a spherical shape, and the end portion 42 b is in contact with the needle bearing 54. Accordingly, the pressing roller shaft 42 is supported by the first support portion 43 and the second support portion 44 so as to be rotatable and tiltable with respect to the direction of the axis connection line O.

  The holding portion 41 is provided between the first support portion 43 and the second support portion 44 and is attached to the pressing roller shaft 42. The holding portion 41 rotates and tilts integrally with the pressing roller shaft 42.

  A first shaft portion 57 is fixed to the holding portion 41. When the pressing roller shaft 42 is in a direction perpendicular to the axial center connection line O when viewed from the axial direction of the input shaft 10, the first shaft portion 57 coincides with the axial center connection line O. Further, the first shaft portion 57 is provided so that the first shaft portion 57 inclines with respect to the disk surface in FIG.

  The pressing roller 40 is rotatably supported by the first shaft portion 57.

  The pressing roller 40 contacts the side disk 12b in the disk overlapping region, and rotates around the first shaft portion 57. When the pressing force transmitted through the first roller follower 47 increases, the pressing roller 40 elastically deforms the disks 11 and 12 to form a torque transmission contact portion.

  The urging force of the springs 60 of the urging portions 45 a and 45 b acts on the pressing roller 40 via the holding portion 41.

  As shown in FIG. 5, in the first roller follower 47, a second shaft 56 connected to the second support portion 44 is inserted into the inner peripheral hole 47a, and the front clamp arm 67 and the rear clamp arm 68 on the side of the disks 11, 12 are arranged. Rolls in contact with the side surfaces 67a and 68a.

  The end of the second shaft 56 opposite to the end connected to the second support portion 44 is inserted into a hole 48 a formed in the roller follower support block 48. The hole 48 a is an oval-shaped hole formed along the axial direction of the input shaft 10. The roller follower support block 48 supports the second shaft 56 slidably in the axial direction of the input shaft 10 along the hole 48a. The roller follower support block 48 is connected to the bracket 37 via a first shaft 38 extending in the direction of the axis connection line O, and moves in the direction of the axis connection line O according to the movement of the bracket 37.

  The disc clamp mechanism 31 includes an arm shaft 65, a front clamp arm 67, and a rear clamp arm 68.

  The arm shaft 65 is a columnar member that extends in a direction perpendicular to the axis connection line O and the input shaft 10. The arm shaft 65 is provided so as to be orthogonal to the input shaft 10 and to overlap the center of the primary disk 11 in the axial direction of the input shaft 10 as shown in FIG.

  The front clamp arm 67 is a plate-like member having an approximately L shape as shown in FIG. The front clamp arm 67 is rotatably supported on the arm shaft 65 on one end side. At the other end of the front clamp arm 67, an engaging portion 72 of a pressing force adjusting mechanism 32 described later is formed. As shown in FIG. 5, the front clamp arm 67 is in contact with the first roller follower 47 at the side surface 67 a (the surface forming the thickness of the plate member) on the side of the disks 11 and 12.

  The rear clamp arm 68 is a plate-like member having an approximately L shape as shown in FIG. The rear clamp arm 68 is rotatably supported on the arm shaft 65 on one end side. The other end of the rear clamp arm 68 is connected to a case 70 of a pressing force adjusting mechanism 32 described later. As shown in FIG. 5, the side surface 68 a (the surface forming the thickness of the plate-like member) of the rear clamp arm 68 contacts the first roller follower 47.

  The front clamp arm 67 and the rear clamp arm 68 are rotated about the arm shaft 65 by the pressing force generated by the pressing force adjusting mechanism 32, and the pressing force is applied to the holding portion 41 by sandwiching the pair of pressing roller mechanisms 30. A pressing force is applied from the pressing roller 40 to the primary disk 11 and the secondary disk 12.

  As shown in FIG. 3, the pressing force adjusting mechanism 32 includes a case 70, a second shaft portion 71, an engaging portion 72, a rotating portion 73, a compression spring 74, and a second actuator (not shown). Is provided.

  The case 70 is connected to the end of the rear clamp arm 68. The case 70 accommodates a part of the rotating part 73, and the second shaft part 71 is attached thereto.

  The second shaft portion 71 is a columnar member parallel to the arm shaft 65, and supports the rotating portion 73 in a rotatable manner.

  The engaging portion 72 is formed at the end portion of the front clamp arm 67, and extends from the end portion toward the rear clamp arm 68, and the second shaft portion extends from the end portion of the connecting portion 75 on the rear clamp arm 68 side. And a curved surface portion 76 extending so as to surround 71. The curved surface portion 76 has an arc-shaped outer peripheral wall with the second shaft portion 71 as the center. The second roller follower 79 of the rotating portion 73 comes into contact with the outer peripheral wall of the curved surface portion 76 and rolls.

  The rotating unit 73 includes a rotating body 77, a rotation transmission block 78, and a second roller follower 79. The rotating body 77 includes a first body 80 and a second body 81.

  The first body 80 is a substantially U-shaped member extending so as to sandwich the second shaft portion 71. The first body 80 abuts on the outer peripheral wall of the second shaft portion 71 and is supported by the second shaft portion 71 so as to be rotatable and slidable. The first body 80 includes a stopper 82 that supports one end of the compression spring 74 at the end on the open side.

  The rotation transmission block 78 is supported by the second shaft portion 71 so that the second shaft portion 71 passes therethrough and is rotatable. The rotation transmission block 78 supports the end of the compression spring 74 opposite to the end supported by the stopper 82.

  The first body 80 and the second body 81 are joined, and the second roller follower 79 is attached to the second body 81.

  The rotating body 77 is always urged in the direction from the second shaft portion 71 toward the stopper 82 by the restoring force of the compression spring 74. However, the second body 81 located on the opposite side to the compression spring 74 with respect to the second shaft portion 71 abuts on the rotation transmission block 78, and the rotation body 77 moves from the second shaft portion 71 toward the compression spring 74. Is regulated.

  The second roller follower 79 rolls in contact with the arc-shaped outer peripheral wall of the curved surface portion 76. The second roller follower 79 rotates the second shaft portion 71 integrally with the rotary body 77 by the second actuator, and is always biased toward the second shaft portion 71 by the compression spring 74.

  The pressing force adjusting mechanism 32 rotates the second roller follower 79 about the second shaft portion 71, thereby causing the compression spring 74 to urge the second roller follower 79 toward the second shaft portion 71. Change direction. Thereby, the force which pushes the front clamp arm 67 to the rear clamp arm 68 side, ie, the pressing force which clamps a pair of pressing roller mechanism 30, is changed.

  Next, the torque transmission contact portion will be described.

  FIG. 6 is a diagram showing a disk overlap area. FIG. 7 is a diagram showing a state where a torque transmission contact portion is formed in the VII-VII cross section of FIG. 6.

  As described above, the primary disk 11 and the secondary disk 12 are disks formed so that the outer peripheral side is warped over the entire circumference. Examples of the shape in which the outer peripheral side is warped over the entire circumference include a mortar shape and a mountain shape.

  As shown in FIG. 6, the disk 11a and the side disk 12b are arranged in a direction in which the outer peripheral side is separated from the center disk 12a.

  Further, the primary disk 11 and the secondary disk 12 are set so that the warpage increases as the disk is arranged on the outer side. It should be noted that the center disk 12a is flat, and the state in which the center disk 12a is a flat disk is also included in the state where the warpage is larger as the disk disposed on the outer side.

  In the transmission 3, when a pressing force by the pressing mechanism 13 is applied, the primary disk 11 and the secondary disk 12 are elastically deformed to come into contact with each other, and a torque transmission contact portion is formed. At this time, as shown in FIG. 7, the disc 11a and the side disc 12b are bent in the direction away from the center disc 12a at both outer peripheral sides in the direction orthogonal to the axial connection line O.

  Since the amount of bending of the disk increases as the warpage of the disk increases, the amount of bending of the side disk 12b becomes larger than the amount of bending of the disk 11a. As a result, the gaps between the disks in the direction orthogonal to the axis connection line O are larger than the state where the pressing force by the pressing mechanism 13 is not applied.

  As the phase of the disk approaches the direction of the axis connection line O, the gap between the disks decreases, and the disks 11 and 12 come into contact with each other in the direction of the axis connection line O. That is, the disks 11 and 12 are in contact only in the direction of the axis connection line O, and the other parts are not in contact.

  Further, since the disk 11a and the side disk 12b are bent in a mountain shape having a ridge line in the direction of the axis connection line O, the ridge line portions of the disk 11a and the side disk 12b are straight in the direction of the axis connection line O. To form a contact portion. Therefore, portions other than the torque transmission contact portion also come into contact with each other, but the contact surface pressure is small and the generated frictional force is small except for the torque transmission contact portion where the pressing roller 40 presses the disks 11 and 12. Further, the frictional force can be further reduced by reducing the surface roughness of the disks 11 and 12. Accordingly, it is possible to suppress a decrease in torque transmission efficiency due to contact with parts other than the torque transmission contact portion.

  According to the above aspect, when the pressing roller 40 is brought into contact with the primary disk 11 and the secondary disk 12, the outer peripheral sides of the disk 11a and the side disk 12b in the direction orthogonal to the direction of the axis connection line O are center disk 12a. Deflection in a direction away from At this time, as the warpage of the disk is larger, the disk is bent more greatly. In the direction of the shaft connecting line O, portions other than the torque transmission contact portion also contact, but the contact surface pressure is low and the generated frictional force is small except for the torque transmission contact portion where the pressing roller 40 presses the disks 11 and 12. . Therefore, a decrease in torque transmission efficiency due to frictional resistance can be suppressed.

  The embodiment of the present invention has been described above, but the above embodiment is merely one example of application of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. is not.

  For example, in the above embodiment, the two disks 11a and the two side disks 12b are provided. However, the side disk 12b may not be provided, and the disk 11a is further provided outside the side disk 12b. It is good also as a structure.

  This application claims the priority based on Japanese Patent Application No. 2013-045327 for which it applied to Japan Patent Office on March 7, 2013, and all the content of this application is integrated in this specification by reference.

Claims (1)

A multi-disc transmission,
An input shaft to which rotation from a power source is input;
An output shaft disposed parallel to the input shaft;
A primary disk provided on the input shaft;
A secondary disk provided on the output shaft and having a disk overlap area overlapping the primary disk;
A pair of pressing rollers disposed on both sides of the primary disk and the secondary disk in the disk overlapping region;
A speed change actuator that moves the pair of pressing rollers between the input shaft and the output shaft;
A pressing mechanism that presses the pair of pressing rollers against the primary disk and the secondary disk, and
At least one of the primary disk and the secondary disk is composed of a plurality of disks and arranged with the other interposed therebetween, and passes through the center in the axial direction of the output shaft in all the disks of the primary disk and the secondary disk. A multi-disc transmission in which a disc disposed at a position away from a surface orthogonal to the output shaft has a greater warpage in a direction away from the orthogonal surface .

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