JPH02103564U - - Google Patents

Description

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the main parts of an example of an automatic transmission to which this invention is applied, Figure 2 is a cross-sectional view showing a part of the clutch, especially the drum, which is disassembled, and Figure 3 is a cross-sectional view of this invention. FIG. 4 is a partial sectional view schematically showing an example of a conventional automatic transmission clutch. 20... Clutch, 21... Automatic transmission, 26... Hollow shaft portion, 27... Clutch drum, 28... First cylindrical member, 29... Second cylindrical member, 30... Fitting hole, 31
...Boss part, 32... Small diameter cylindrical part, 33, 43... Side wall part, 34... Groove, 35, 36... Supply/discharge hole, 37... First
Piston, 42...Large diameter cylindrical portion, 44...Second piston, 45...Gap, 47...Sliding surface, 50...Outer peripheral hub, 51, 56, 57, 58...Friction plate.

Claims (1)

[Scope of Claim for Utility Model Registration] A friction plate is fitted on the inner circumferential side of a clutch drum rotatably fitted to the outer periphery of a shaft member in a non-rotatable manner with respect to the clutch drum, and the friction plate is Two pistons that move back and forth are disposed on the inner circumferential side of the clutch drum so that at least a portion thereof overlaps each other in the axial direction, and pressurized fluid is supplied to the back side of each piston opposite to the friction plate.
In an automatic transmission clutch in which a discharge hole is formed in a fitting portion of the clutch drum to the shaft member, the clutch drum has a boss portion fitting to the outer periphery of the shaft member and a boss portion of the boss portion. A side wall projecting outward in the radial direction at one end, a small-diameter cylindrical portion formed parallel to the boss at the outer peripheral end of the side wall, and with the outer peripheral surface as a sliding surface along the axial direction, and the boss. a first cylindrical member having two supply/discharge holes formed on both sides sandwiching the side wall portion in the axial direction and opening on both the inner and outer periphery of the boss portion; and a cylindrical portion into which the friction plate is fitted. A large-diameter cylindrical part that is integral and has a larger diameter than the small-diameter cylindrical part, and one of the supply and discharge holes that is integrated with the large-diameter cylindrical part and between the side wall part and the end of the small-diameter cylindrical part. a second cylindrical member having a second side wall portion attached to the outer circumferential surface of the end portion of the boss portion with a gap communicating with the hole, and the first of the two pistons A piston is provided on the outer circumferential side of the small diameter cylindrical portion so as to slide along the outer circumferential surface of the small diameter cylindrical portion by fluid pressure supplied from the one supply/discharge hole through the gap, and a second The piston is provided on the outer circumferential side of the boss portion so as to slide along the outer circumferential surface of the boss portion by fluid pressure supplied from the other one of the supply/discharge holes. Structure of clutch for automatic transmission.