Control method and control device for dog clutch

Patent metadata

Field	Value
Publication number	US-9835209-B2
Application number	US-201715397185-A
Country	US
Kind code	B2
Filing date	Jan 3, 2017
Priority date	Jan 13, 2016
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A dog clutch includes: a first rotational member; a second rotational member; a clutch member; an electromagnetic coil; and a position detecting portion. A control method for the dog clutch, includes: supplying an exciting current to the electromagnetic coil when the clutch member is moved from the non-connecting position toward the connecting position; and promptly reducing the exciting current when the position detecting portion detects that the clutch member has moved to the connecting position.

First claim

What is claimed is:

1. A control method for a dog clutch, the dog clutch including:
a first rotational member;
a second rotational member placed rotatable relative to the first rotational member around a common rotating axis;
a clutch member restricted from rotating relative to the first rotational member, the clutch member having meshing teeth meshing with the second rotational member, the clutch member being movable between a connecting position where the meshing teeth mesh with the second rotational member and a non-connecting position where the meshing teeth do not mesh with the second rotational member;
an electromagnetic coil configured to generate a magnetic force to move the clutch member from the non-connecting position toward the connecting position; and
a position detecting portion configured to detect a position of the clutch member,
the control method comprising:
supplying an exciting current to the electromagnetic coil when the clutch member is moved from the non-connecting position to the connecting position; and
promptly reducing the exciting current when the position detecting portion detects that the clutch member has moved to the connecting position.

2. The control method according to claim 1 , wherein
when the position detecting portion detects that the clutch member has moved to the connecting position, the exciting current is gradually reduced.

3. The control method according to claim 1 , wherein
the exciting current is reduced before a position where the clutch member moves closest to the second rotational member.

4. The control method according to claim 1 , wherein
a tooth flank of the meshing tooth of the clutch member is inclined in a rotation direction so as to generate a meshing reaction force for pressing the clutch member toward the non-connecting position side due to a torque transmitted between the first rotational member and the second rotational member.

5. The control method according to claim 4 , wherein:
the dog clutch includes a cam mechanism configured to generate a cam thrust to move the clutch member to the connecting position by a relative rotation between the clutch member and the first rotational member; and
when it is determined that the cam mechanism is in a state where the cam mechanism generates the cam thrust, the exciting current is reduced.

6. The control method according to claim 5 , wherein:
the cam thrust is larger than the meshing reaction force.

7. A control device for a dog clutch, the dog clutch including:
a first rotational member;
a second rotational member placed rotatable relative to the first rotational member around a common rotating axis;
a clutch member restricted from rotating relative to the first rotational member, the clutch member having meshing teeth meshing with the second rotational member, the clutch member being movable between a connecting position where the meshing teeth mesh with the second rotational member and a non-connecting position where the meshing teeth do not mesh with the second rotational member;
an electromagnetic coil configured to generate a magnetic force to move the clutch member from the non-connecting position toward the connecting position;
a position detecting portion configured to detect a position of the clutch member,
the control device comprising an ECU, wherein:
when the clutch member is moved from the non-connecting position toward the connecting position, the ECU is configured to supply an exciting current to the electromagnetic coil; and
when the position detecting portion detects that the clutch member has moved to the connecting position, the ECU is configured to promptly reduce the exciting current.

Assignees

• Jtekt Corp

Inventors

• Onitake Minoru
• Kamitani Yasunori

Classifications

• F16H48/34

  using electromagnetic or electric actuators · CPC title

• F16D2027/002

  Electric or electronic circuits relating to actuation of electromagnetic clutches · CPC title

• F16D2011/008

  characterised by the form of the teeth forming the inter-engaging parts; Details of shape or structure of these teeth · CPC title

• F16D27/108

  with axially movable clutching members · CPC title

• F16D11/14

  with clutching members movable only axially (F16D11/02, F16D11/08 take precedence) · CPC title