Friction engaging device

Patent metadata

Field	Value
Publication number	US-11226015-B2
Application number	US-202016810006-A
Country	US
Kind code	B2
Filing date	Mar 5, 2020
Priority date	May 28, 2019
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

The present disclosure provides a wet friction engaging device. The device includes a plate group engaged with two connecting members and including two groups of friction plates housed in a plate housing chamber and alternately arranged in an axial direction with surfaces facing each other. The plate group is switched between an engaged state in which the friction plates are in close contact with each other, and a disengaged state in which the friction plates are separable from each other. End plates at respective ends of the plate group are kept at a larger distance in the axial direction after a switch to the disengaged state than in the engaged state.

First claim

The invention claimed is:

1. A wet friction engaging device for switching transmission of power to be output to a rotary shaft, the device comprising:
two connecting members, each having an opposed surface facing an opposed surface of the other connecting member in a radial direction with a plate housing chamber interposed therebetween, the chamber being supplied with lubricating oil;
a plate group engaged with the connecting members and including two groups of friction plates housed in the plate housing chamber and alternately arranged in an axial direction with surfaces facing each other; and
a piston moving forward from one side in the axial direction toward the plate group to apply a pressing force to the plate group, wherein
the plate group is switched between an engaged state in which the friction plates are in close contact with each other upon application of the pressing force, and a disengaged state in which the friction plates are separable from each other upon release of the pressing force,
a distance between end plates at respective ends of the plate group in the axial direction in the disengaged state is larger than a distance between end plates at respective ends of the plate group in the axial direction in the engaged state,
one of the end plates is a movable end plate movable in the axial direction together with the piston, and the other is a stationary end plate immovable in the axial direction,
the opposed surface of one of the connecting members has slide recesses extending in the axial direction and having closed ends on a side closer to the piston,
each of the friction plates of one of the groups has slide projections to be fitted into the slide recesses from a side away from the piston so as to be slidable,
the slide recesses include a movement regulator at a part away from the piston, and
the movement regulator restricts sliding of one of the friction plates of the one of the groups, which is fitted last, toward the piston to define the stationary end plate and blocks sliding on a side of the stationary end plate closer to the piston.

2. The friction engaging device of claim 1 , wherein
the movable end plate is integral with the piston through welding or integral molding.

3. The friction engaging device of claim 2 , further comprising:
a ring groove in one of the connecting members; and
a snap ring to be fitted into the ring groove and coming into contact with one of the friction plates of one of the groups, wherein
the snap ring receives the one of the friction plates to restrict movement of the one of the friction plates to the side away from the piston.

4. The friction engaging device of claim 1 , further comprising:
a ring groove in one of the connecting members; and
a snap ring to be fitted into the ring groove and coming into contact with one of the friction plates of one of the groups, wherein
the snap ring receives the one of the friction plates to restrict movement of the one of the friction plates to the side away from the piston.

5. A wet friction engaging device for switching transmission of power to be output to a rotary shaft, the device comprising:
two connecting members, each having an opposed surface facing an opposed surface of the other connecting member in a radial direction with a plate housing chamber interposed therebetween, the chamber being supplied with lubricating oil;
a plate group engaged with the connecting members and including two groups of friction plates housed in the plate housing chamber and alternately arranged in an axial direction with surfaces facing each other; and
a piston moving forward from one side in the axial direction toward the plate group to apply a pressing force to the plate group, wherein
the plate group is switched between an engaged state in which the friction plates are in close contact with each other upon application of the pressing force, and a disengaged state in which the friction plates are separable from each other upon release of the pressing force,
a distance between end plates at respective ends of the plate group in the axial direction in the disengaged state is larger than a distance between end plates at respective ends of the plate group in the axial direction in the engaged states,
one of the end plates is a movable end plate movable in the axial direction together with the piston, and the other is a stationary end plate immovable in the axial direction,
the opposed surface of one of the connecting members has slide recesses extending in the axial direction and having closed ends on a side closer to the piston,
each of the friction plates of one of the groups has slide projections to be fitted into the slide recesses from a side away from the piston so as to be slidable,
the slide recesses include a movement regulator at a part away from the piston, and
the movement regulator restricts sliding of one of the friction plates of the one of the groups, which is fitted last, toward the piston to define the stationary end plate, the device further comprising:
a ring groove in one of the connecting member, and
a snap ring to be fitted into the ring groove and coming into contact with one of the friction plates of one of the groups, wherein
the snap ring receives the one of the friction plates to restrict movement of the one of the friction plates to the side away from the piston.

6. The friction engaging device of claim 5 , wherein the movable end plate is integral with the piston through welding or integral molding.

Assignees

• Mazda Motor

Inventors

• Ebisumoto Hirofumi
• Sori Tsukasa
• Tamegai Hitoshi

Classifications

• F16D25/12

  Details not specific to one of the before-mentioned types · CPC title

• F16D13/69

  Arrangements for spreading lamellae in the released state · CPC title

• F16D13/68

  Attachments of plates or lamellae to their supports {(one or more discs connected to the linings transmitting torque to one or more discs connected to the hub by helical springs in windows in the discs, i.e. rotary vibration dampers F16F15/12)} · CPC title

• F16D25/02

  with means for actuating or keeping engaged by a force derived at least partially from one of the shafts to be connected · CPC title

• F16D13/70

  Pressure members, e.g. pressure plates, for clutch-plates or lamellae; Guiding arrangements for pressure members {(clutch flywheels comprising two or more masses with a rotational damper F16F15/12)} · CPC title