JP2015197208A - Multiplate friction engagement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiplate friction engagement device which can improve heat resistance while suppressing an increase of a length of an axial line direction.SOLUTION: In a multiplate friction engagement device 1 in which a plurality of separators 10 and a plurality of friction plates 20 are alternately arranged, a plurality of the separators 10 have contact parts CA contacting with the friction plates 20 in a state that the separators 10 and the friction plates 20 are friction-engaged with each other, and non-contacting parts NCA1, NCA2 not contacting with the friction plates 20. The separators 10b, 10c and 10d located between the separators 10a, 10e at both ends have salient parts 11 which are salient to an axial line direction at the non-contact part NCA1. A thickness along the axial line direction of a portion including the salient part 11c of the separator 10c located at a center part is equal to or thicker than a thickness along the axial line direction of a portion including the salient parts 11b, 11d of the separators 10b, 10d located at an end part side rather than the center part.

Description

  The present invention relates to a multi-plate friction engagement device in which a plurality of separators and a plurality of core plates are alternately arranged.

  A multi-plate friction engagement device such as a clutch or a brake that frictionally engages with a pressing force of a piston is used in the automatic transmission. As a document disclosing a conventional multi-plate friction engagement device, for example, Japanese Patent Application Laid-Open No. 2008-138821 (Patent Document 1) is cited.

  The multi-plate friction engagement device disclosed in Patent Document 1 is configured by alternately arranging a friction plate having a lining attached to one side of a core plate and a plurality of separators, and the core plate along the axial direction. Is thinner than the separator.

  Since the core plate is always rotating, heat dissipation by the lubricating oil is good, and even when it is pressed by a piston or the like and a local high surface pressure is generated, it can be dispersed by rotation. . For this reason, the core plate is advantageous for heat dissipation. By increasing the thickness of the separator while reducing the thickness of the core plate, the heat capacity of the separator can be increased while suppressing an increase in the axial length (pack length) of the multi-plate frictional engagement device. Thereby, the heat resistance as the whole multi-plate friction engagement device can be improved.

JP 2008-138821 A

  However, in the multi-plate friction engagement device disclosed in Patent Document 1, in the specification that requires space saving, it cannot be said that the increase in the length in the axial direction is still sufficiently suppressed. It is in. In the multi-plate friction engagement device disclosed in Patent Document 1, since the separator is generally thicker than the core plate, the length in the axial direction increases.

  The present invention has been made in view of the above problems, and an object of the present invention is a multi-plate friction engagement device capable of improving heat resistance while suppressing an increase in length in the axial direction. Is to provide.

  This multi-plate friction engagement device is a multi-plate in which a plurality of separators and a plurality of friction plates that are rotatable about a rotation axis and are movable along the axial direction of the rotation shaft are alternately arranged. A plate friction engagement device, wherein the separator includes a contact portion that contacts the friction plate in a state where the separator and the friction plate are moved along the axial direction and frictionally engaged with each other. And a non-contact portion that does not contact the friction plate. The separator located between the separators at both ends of the plurality of separators has a protruding portion that protrudes in the axial direction at the non-contact portion. The thickness along the axial direction of the portion including the protruding portion of the separator located in the central portion is in the axial direction of the portion including the protruding portion of the separator positioned closer to the end than the central portion. The thickness is equal to or greater than the thickness along.

  In addition, the separator located in the central portion refers to a single separator at the center when the number of the plurality of separators is an odd number, and the two separators closest to the center when the number of the plurality of separators is an even number. Point to.

  As described above, it is possible to suppress an increase in the thickness of the contact portion that contributes to the pack length by providing the protrusion only in the non-contact portion where the separator and the friction plate do not contact. Even when the thickness of the contact portion is not increased, the heat capacity of the separator can be increased by providing the protruding portion. For this reason, by having the said structure, heat resistance can be improved, suppressing the increase in pack length.

  ADVANTAGE OF THE INVENTION According to this invention, the multi-plate friction engagement apparatus which can improve heat resistance can be provided, suppressing the increase in the length of an axial direction.

1 is a schematic sectional view showing a multi-plate friction engagement device according to Embodiment 1. FIG. It is a top view of the separator along the II-II line shown in FIG. 6 is a schematic cross-sectional view showing a multi-plate friction engagement device according to Embodiment 2. FIG. It is a top view of the separator along the IV-IV line shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional view showing a multi-plate friction engagement device according to the present embodiment. FIG. 1 shows a state in which a plurality of separators and a plurality of friction plates are frictionally engaged. FIG. 2 is a plan view of the separator along the line II-II shown in FIG. With reference to FIG. 1 and FIG. 2, the multi-plate frictional engagement device according to the present embodiment will be described.

  The multi-plate friction engagement device 1 includes a plurality of separators 10 and a plurality of friction plates 20. The plurality of separators 10 and the plurality of friction plates 20 are alternately arranged. The plurality of separators 10 and the plurality of friction plates 20 are provided so as to be rotatable about the rotation axis C and to be movable along the axial direction of the rotation axis C. The plurality of separators 10 and the plurality of friction plates 20 are provided in a gap formed between the tubular portion 40 and a tubular hub 50 that is rotatable relative to the tubular portion 40. . The cylindrical part 40 supports these so that the some separator 10 can move along an axial direction. The hub 50 supports the plurality of friction plates 20 so as to be movable along the axial direction.

  The plurality of friction plates 20 include a ring-shaped core plate 21 and a friction member 22. A friction member 22 is attached to both main surfaces of the core plate 21. As the friction member 22, a general wet friction member such as a sintered alloy system, a carbon system, a cork system, or a paper system is used. A spline internal tooth portion is provided on the inner peripheral side of the core plate 21. The spline internal teeth of the core plate 21 are provided so as to be able to fit into the spline groove 51 provided on the outer periphery of the hub 50. The spline groove 51 of the hub 50 extends along the axial direction. Thereby, the plurality of friction plates 20 can move along the axial direction. Further, the plurality of friction plates 20 can rotate around the rotation axis together with the hub 50.

  The some separator 10 contains the spline external tooth part 12 (refer FIG. 2) provided in the outer peripheral side. The spline outer tooth portion 12 is provided so as to be able to fit into a spline groove portion 41 provided on the inner peripheral surface of the cylindrical portion 40. The spline groove portion 41 extends along the axial direction. Thereby, the some separator 10 can move along an axial direction. Further, the plurality of separators 10 can be rotated around the rotation axis integrally with the cylindrical portion 40.

  The plurality of separators 10 include a contact part CA and non-contact parts NCA1 and NCA2. The contact portion CA is a portion where the separator 10 contacts the friction plate 20 in a state where the plurality of separators 10 and the plurality of friction plates 20 are moved in the axial direction and are frictionally engaged. The non-contact portions NCA1 and NCA2 are portions where the separator 10 does not contact the friction plate 20 when the plurality of separators 10 and the plurality of friction plates 20 are moved along the axial direction and are frictionally engaged. The non-contact portion NCA1 is located on the radially outer side of the separator 10 with respect to the contact portion CA, and the non-contact portion NCA2 is located on the radially inner side of the separator 10 with respect to the contact portion CA.

  Separators 10b, 10c, and 10d located between separators 10a and 10e located at both ends of the plurality of separators 10 include projecting portions 11b, 11c, and 11d that project in the axial direction. The protrusions 11b, 11c, and 11d protrude from both main surfaces aligned in the axial direction of the separator 10. Each of the protruding portions 11b, 11c, and 11d is a part of the spline external tooth portion 12, and is provided in the non-contact portion NCA1.

  The separator 10a located at one end has a substantially constant thickness L1 along the axial direction from the outer peripheral side to the inner peripheral side (from the non-contact portion NCA1 to NCA2). Separators 10b, 10c, and 10d located between separators 10a and 10e located at both ends have a substantially constant thickness L1 from the contact portion CA to the non-contact portion NCA2. That is, the thicknesses of the portions where the protrusions 11 are not provided in the separators 10b, 10c, and 10d are equal.

  The portion including the protruding portion 11c of the separator 10c located at the center has a thickness L3 along the axial direction. The portions including the projecting portions 11b and 11d of the separators 10b and 10d located on the end side from the center portion have a thickness L2 along the axial direction.

  The thickness L1 is smaller than the thickness L2 and the thickness L3, and the thickness L3 is equal to or greater than the thickness L2. That is, the thickness L3 along the axial direction of the portion including the protruding portion 11c of the separator 10c located in the central portion is a portion including the protruding portions 11b and 11d of the separators 10b and 10d positioned on the end side from the central portion. The thickness is equal to or greater than the thickness L2 along the axial direction. These thicknesses L1, L2, and L3 satisfy the relationship of L1 <L2 ≦ L3.

  The thickness L1 is preferably equal to the thickness along the axial direction of the core plate 21, and is preferably smaller than the thickness of the core plate 21. By making the thickness L1 smaller than the thickness of the core plate 21, the length along the axial direction of the multi-plate friction engagement device 1 can be shortened.

  The thickness of the separator 10e located at the other end is adjusted in order to absorb variations in the thickness of the separator 10 and the friction plate 20 stacked in the axial direction when the multi-plate friction engagement device 1 is assembled.

  The plurality of separators 10 and the plurality of friction plates 20 move by a predetermined distance or more along the axial direction from one end side to the other end side on the side opposite to the friction plate 20 when viewed from the separator 10e located at the other end. Movement restricting means (not shown) for restricting the movement is provided. For example, a snap ring (not shown) is used as the movement restricting means. The snap ring is fitted into a groove portion (not shown) provided on the inner peripheral surface of the cylindrical portion 40 so that the axial movement is impossible.

  The plurality of separators 10 and the plurality of friction plates 20 are pinched between the pressing member 60 and the above-described movement restricting unit by being pushed toward the separator 10 e by the pressing member 60 from the released state separated from each other. As a result, the plurality of separators 10 and the plurality of friction plates 20 are frictionally engaged via the friction member 22, and the rotation of the hub 50 is braked. On the other hand, when the pressing by the pressing member 60 is released, the frictional engagement is released. Thereby, the some separator 10 and the some friction plate 20 move along an axial direction so that it may leave | separate from a movement control means. By releasing the frictional engagement, the hub 50 can rotate relative to the tubular portion 40.

  In a state where the plurality of separators 10 and the plurality of friction plates 20 are frictionally engaged, the pressure is more likely to be concentrated at the center than at both ends of the multi-plate friction engagement device 1. As a result, the frictional force acting on the separator 10c located at the center is larger than the frictional force acting on the separators 10a, 10e located at both ends. For this reason, the amount of heat transferred to the separator 10c located at the center is larger than the amount of heat transferred to the separators 10a and 10e located at both ends.

  Here, since the separators 10b, 10c, and 10d have the protruding portions 11 protruding in the axial direction, their heat capacities are increased as compared with the separator 10a located at one end. For this reason, by absorbing and storing heat generated by friction, the temperature of the friction portion can be lowered and heat resistance can be improved.

  Further, when the thickness L3 is larger than the thickness L2, the heat capacity of the separator 10c to which a large amount of heat is transmitted can be further increased. For this reason, it can suppress that a temperature difference arises between several separators 10. FIG.

  Furthermore, by providing the protrusion 11 only in the non-contact part NCA1 where the separator 10 and the friction plate 20 do not contact, it is possible to suppress an increase in the thickness of the contact part that contributes to the pack length. Thus, the multi-plate friction engagement device 1 according to the present embodiment can improve heat resistance while suppressing an increase in the length in the axial direction.

(Embodiment 2)
FIG. 3 is a schematic cross-sectional view showing the multi-plate friction engagement device according to the second embodiment. 4 is a plan view of the separator taken along line IV-IV shown in FIG. With reference to FIG. 3 and FIG. 4, the multi-plate friction engagement device 1A according to the present embodiment will be described.

  When compared with the multi-plate friction engagement device 1 according to the first embodiment, the multi-plate friction engagement device 1A protrudes into the configuration of the protrusion 11 provided in the non-contact portion NCA1 and the non-contact portion NCA2. The difference is that the portion 13 is provided. Other configurations are substantially the same.

  Separator 10b, 10d contains protrusion part 11b, 11d which protrudes from the main surface located in the side far from separator 10c located in a center part. Separator 10c located in the central part includes protrusion 11c. The protruding portion 11c is provided so as to be close to the main surface on the side where the protruding portions 11 of the separators 10b and 10d adjacent to the separator 10c are not provided. The protruding portions 11c are provided so as to protrude from both main surfaces of the separators 10c arranged along the axial direction.

  The thickness L3 of the separator 10c in the portion including the protruding portion 11c of the separator 10c located in the center is equal to the separator 10b, 10d in the portion including the protruding portions 11b and 11d of the separators 10b and 10d positioned on the end side from the center. Greater than the thickness L2.

  Separator 10b, 10c, 10d contains protrusion part 13b, 13c, 13d provided in non-contact part NCA2. The protruding portions 13b, 13c, and 13d are provided so as to protrude from both main surfaces of the separators 10b, 10c, and 10d. In addition, the protrusion part 13 may protrude only from the main surface of the one side of separator 10b, 10c, 10d.

  The thicknesses L4 of the separators 10b, 10c, 10d including the protrusions 13b, 13c, 13d are provided to be equal to each other. In addition, these thickness may be provided so that it may differ. For example, the thickness of the separator 10c including the protrusion 13c may be larger than the thickness of the separators 10b and 10d including the protrusions 13b and 13d.

  Thus, by providing the protrusion 13 in the non-contact part NCA2, in the present embodiment, compared to the first embodiment, the separators 10b, 10c, which are located between the separators 10a, 10e located at both ends, The heat capacity of 10d can be further increased. For this reason, in this Embodiment, the effect equivalent to or more than Embodiment 1 is acquired.

  In the first and second embodiments described above, it is further preferable that the thickness of the separator 10 in the portion including the protruding portion 11 gradually increases from the end portion side to the central portion. In this case, the heat capacity of the separator 10 can be increased according to the amount of frictional heat. For this reason, the temperature between separators can be made uniform and the operation of the multi-plate friction engagement device can be made more stable.

  In Embodiment 1 and 2 mentioned above, although the case where the protrusion part 11 comprised a part of spline tooth was illustrated and demonstrated, it is not limited to this, You may be provided in parts other than a spline tooth. . Further, the shape of the protruding portion 11 can be appropriately changed as long as the movement of the separator 10 and the friction plate 20 in the axial direction and the rotation around the rotation axis are not hindered.

  In the first and second embodiments described above, the case where the number of the plurality of separators 10 is 5 and the number of the plurality of friction plates 20 is 4 has been described as an example. can do.

  Although the embodiments of the present invention have been described above, the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all modifications within the scope.

  1, 1A Multi-plate friction engagement device 10, 10a, 10b, 10c, 10d, 10e Separator, 11, 11b, 11c, 11d Protruding part, 12 Spline external tooth part, 13, 13b, 13c, 13d Protruding part, 20 Friction plate, 21 core plate, 22 friction member, 40 cylindrical part, 41 spline groove part, 50 hub, 51 spline groove part, 60 pressing member.

Claims (1)

A multi-plate friction engagement device in which a plurality of separators and a plurality of friction plates, which are rotatable about a rotation axis and movable along the axial direction of the rotation axis, are alternately arranged,
The plurality of separators include a contact portion that contacts the friction plate and a non-contact portion that does not contact the friction plate in a state where the separator and the friction plate move along the axial direction and are frictionally engaged. Have
The separator located between the separators at both ends of the plurality of separators has a protruding portion protruding in the axial direction in the non-contact portion,
The thickness along the axial direction of the portion including the protruding portion of the separator located in the central portion is in the axial direction of the portion including the protruding portion of the separator positioned closer to the end side than the central portion. A multi-plate frictional engagement device provided with a thickness equal to or greater than the thickness along.

Images