Starting device

Patent metadata

Field	Value
Publication number	US-9709127-B2
Application number	US-201314410172-A
Country	US
Kind code	B2
Filing date	Aug 2, 2013
Priority date	Aug 2, 2012
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

In a starting device including a centrifugal-pendulum vibration absorbing device, while lock-up is released, a flow of working oil directed from a lock-up piston side toward a damper mechanism is produced in a clutch engagement chamber. A thrust force in the axial direction directed from the lock-up piston toward the damper mechanism is applied to a weight, of a mass body of the centrifugal-pendulum vibration absorbing device, disposed on the lock-up piston side. A support member of the centrifugal-pendulum vibration absorbing device is provided with weight support protrusions that project in the axial direction of an input shaft of a speed change device toward the weight disposed on the lock-up piston side.

First claim

The invention claimed is:

1. A starting device comprising:
a front cover coupled to a motor of a vehicle;
a pump impeller joined to the front cover;
a turbine runner disposed to face the pump impeller and coupled to an input shaft of a transmission;
a lock-up clutch having a lock-up piston that defines a lock-up chamber together with the front cover;
a damper mechanism including an input element that is coupled to the lock-up piston and that defines a clutch engagement chamber that opposes the lock-up chamber together with the lock-up piston, an output element coupled to the input shaft of the transmission, and a spring disposed between the input element and the output element; and
a centrifugal-pendulum vibration absorbing device disposed in the clutch engagement chamber and coupled to the damper mechanism, wherein:
the lock-up clutch engages and disengages the front cover and the input element of the damper mechanism with and from each other in accordance with a pressure difference between a clutch disengagement pressure supplied to the lock-up chamber and a clutch engagement pressure regulated independently of the clutch disengagement pressure and supplied to the clutch engagement chamber;
a gap that allows a working fluid from the lock-up chamber to flow into the lock-up engagement chamber is formed at a coupling portion between the lock-up piston and the input element;
the damper mechanism is disposed on the turbine runner side with respect to the centrifugal-pendulum vibration absorbing device and the gap;
the centrifugal-pendulum vibration absorbing device includes a support member that is coupled to the damper mechanism and that extends in parallel with a clutch engagement chamber side-surface of the lock-up piston, multiple mass bodies each including two weights that face each other via the support member and that are coupled to each other, and a guide roller that rolls on inner peripheral surfaces of a first notch portion formed in the support member and a weight- side notch portion formed in the weight;
one of the support member and the weight disposed on the lock-up piston side has a protrusion that projects toward the other in an axial direction of the input shaft; and
the support member and the weight disposed on the damper mechanism side do not have another protrusion that projects in the axial direction at a position that is symmetrical with respect to the protrusion about a plane that is orthogonal to an axis of the input shaft and that passes through a center, in a thickness direction, of a portion of the support member interposed between the two weights.

2. The starting device according to claim 1 , wherein
the protrusion is provided on the support member so as to project toward the weight disposed on the lock-up piston side.

3. The starting device according to claim 2 , wherein:
the first notch portion of the support member has a larger opening area than the weight-side notch portion of the weight; and
the protrusion projects toward the weight disposed on the lock-up piston side at a location on a circumferential end portion side of the mass body with respect to the first notch portion.

4. The starting device according to claim 2 , wherein:
two guide rollers are provided for each of the mass bodies, and spaced from each other;
two first notch portions are provided for each of the mass bodies, and disposed symmetrically about a swing center line of the mass body;
a plurality of recessed portions that are depressed toward a center of the support member are formed in the support member so as to interpose the two first notch portions for each of the mass bodies; and
the protrusion projects toward the weight disposed on the lock-up piston side from a location between the first notch portion and the recessed portion.

5. The starting device according to claim 2 , wherein:
two guide rollers are provided for each of the mass bodies, and spaced from each other;
two first notch portions are provided for each of the mass bodies, and disposed symmetrically about a swing center line of the mass body;
a plurality of recessed portions that are depressed toward a center of the support member are formed in the support member so as to interpose the two first notch portions for each of the mass bodies; and
the protrusion projects toward the weight disposed on the lock-up piston side from a location between the first notch portion and the recessed portion.

6. The starting device according to claim 1 , wherein:
the mass bodies each include a coupling member that couples the two weights to each other and that has a cushioning member;
the support member includes a second notch portion that permits movement of the coupling member and that abuts against the cushioning member of the coupling member to determine a swing range of the mass body; and
the protrusion projects toward the weight disposed on the lock-up piston side from a location between the first notch portion and the second notch portion.

7. The starting device according to claim 6 , wherein the protrusion is disposed in closer proximity to the second notch portion than the first notch portion.

8. The starting device according to claim 6 , wherein:
two guide rollers are provided for each of the mass bodies, and spaced from each other;
two coupling members are provided for each of the mass bodies, and positioned on both sides of the two guide rollers;
two first notch portions are provided for each of the mass bodies, and disposed symmetrically about a swing center line of the mass body; and
two second notch portions are provided for each of the mass bodies, and positioned on both sides of the two first notch portions.

9. The starting device according to claim 6 , wherein:
two guide rollers are provided for each of the mass bodies, and spaced from each other;
two coupling members are provided for each of the mass bodies, and positioned on both sides of the two guide rollers;
two first notch portions are provided for each of the mass bodies, and disposed symmetrically about a swing center line of the mass body; and
two second notch portions are provided for each of the mass bodies, and positioned on both sides of the two first notch portions.

Assignees

• Aisin Aw Co

Inventors

• Takikawa Yoshihiro
• Nagae Akihiro
• Maruyama Kazuto

Classifications

• F16H2045/0263

  the damper comprising a pendulum · CPC title

• F16H2045/0294

  Single disk type lock-up clutch, i.e. using a single disc engaged between friction members · CPC title

• F16H2045/0226

  comprising two or more vibration dampers · CPC title

• F16H2045/0205

  two chamber system, i.e. without a separated, closed chamber specially adapted for actuating a lock-up clutch · CPC title

• F16H45/02

  with mechanical clutches for bridging a fluid gearing of the hydrokinetic type (control of torque converter lock-up clutches F16H61/14) · CPC title