Piston for automatic transmission

A technology for automatic transmissions and pistons, which is applied in fluid-driven clutches, mechanical-driven clutches, and non-mechanical-driven clutches, etc., and can solve problems such as mutual frictional contact, decreased durability of pistons and frictional engagement elements, and increased power loss in automatic transmissions. Achieve the effects of reducing stress, improving durability, and improving operating efficiency
CN1993565AInactive Publication Date: 2007-07-04TOYOTA JIDOSHA KK +1
1 Cites 6 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TOYOTA JIDOSHA KK
Publication Date
2007-07-04
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A piston (18; 80) for an automatic transmission (8), including a first piston member (46) forming a cylindrical portion and a second piston member (48; 82) forming a bottom portion, wherein the first piston member has a plurality of engaging grooves (76) having a radial surface (76a) extending in a radial direction of the first piston member, and the second piston member (48; 82) has a plurality of elongate claws (70) having a free end portion and a fixed end portion, and being bent in an axial direction of the second piston member such that the free end portion is spaced from the fixed end portion in the axial direction toward an open end of the piston, each elongate claw having a first engaging lug (72) which is held in engagement with the corresponding engaging groove and in pressing contact with the radial end face of the corresponding engaging groove.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention generally relates to pistons operable to force frictional engagement elements of a clutch or brake provided in an automatic transmission against each other to place the clutch or brake in an engaged state. Background technique

[0002] A known automatic transmission includes clutches and brakes each provided with friction engaging elements in the form of a plurality of friction plates so that the automatic transmission automatically shifts gears by selectively engaging and disengaging the clutches and brakes. Each clutch or brake is placed into engagement by pistons forcing the frictional engagement elements against each other. JP-9-32919A discloses an example of such a piston consisting of two parts, a first piston part forming a cylindrical portion of the piston and a second piston part forming a bottom of the piston. In the piston disclosed in JP-9-32919A, the first piston part (cylindrical part) has a slit, and the second pis...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More