Vehicle axle connect and disconnect system

Patent metadata

Field	Value
Publication number	US-9868351-B2
Application number	US-201615171481-A
Country	US
Kind code	B2
Filing date	Jun 2, 2016
Priority date	Jun 2, 2016
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

An electronic self-locking connect and disconnect system for vehicles. The system includes a motor which turns a gear that meshes with a ring gear contained within a housing. The ring gear meshes with a lead screw thread on an outer surface of a lead screw. When the motor is activated the ring gear rotates the lead screw thread which selectively engages or disengages the clutch. A groove extends on the outer surface of and transverse to the lead screw thread. A pin extends radially inward from an inner surface of the housing till part of the pin is located within the groove. When the pin contacts a radial wall of the groove it prevents further rotation of the lead screw which prevents the stub shaft from axially moving beyond predetermined points. A spring and a sliding collar may be utilized to accommodate full motor travel regardless of the clutch state.

First claim

What is claimed is:

1. A vehicle connect and disconnect system, comprising:
a stub shaft having a first end portion, a second end portion, a middle portion and an outer surface;
wherein said outer surface of said first end portion of said stub shaft has a first bushing having a first end, a second end, an inner surface and an outer surface;
wherein said first bushing is connected to said outer surface of said first end portion of said stub shaft;
wherein said second end portion of said stub shaft has a plurality of clutch teeth;
wherein axially inboard from said plurality of clutch teeth on said second end portion of said stub shaft is a second bushing having a first end, a second end, an inner surface and an outer surface;

a first shaft having a first end portion, a second end portion and an outer surface;
wherein at least a portion of said first shaft is connected to said stub shaft;

a second shaft having a first end portion and a second end portion;
wherein said first end portion of said second shaft has a plurality of clutch teeth that are complementary to said plurality of clutch teeth on said second end portion of said stub shaft;
wherein said plurality of clutch teeth on said first end portion of said second shaft are selectively engagable with said plurality of clutch teeth on said second end portion of said stub shaft;

a lead screw having an inner surface and an outer surface;
wherein said inner surface and said outer surface of said lead screw defines a hollow portion therein;
wherein at least a portion of said stub shaft is disposed within said hollow portion of said lead screw;
wherein said lead screw selectively engages said stub shaft;
wherein said outer surface of said lead screw has a lead screw thread;

wherein a groove extends into said outer surface of said lead screw;
a housing having a first end portion, a second end portion, a middle portion, an inner surface and an outer surface;
wherein said inner surface and said outer surface of said housing defines a hollow portion therein;
wherein said inner surface of said housing has a recessed portion defining a pin housing;
wherein said housing at least partially surrounds said lead screw and said stub shaft;

a pin having a first end portion and a second end portion;
wherein at least a portion of said first end portion of said pin is mounted for rotation within at least one bearing disposed within said pin housing;
wherein at least a portion of said second end portion of said pin is located within said groove;

a ring gear having an inner surface and an outer surface;
wherein said inner surface of said ring gear is meshingly engaged with said lead screw thread on said outer surface of said lead screw to selectively rotate said lead screw; and
wherein said outer surface of said ring gear is drivingly connected to a motor.

2. The vehicle connect and disconnect system of claim 1 , wherein said first end portion of said first shaft is connected to a source of rotational power is selected from the group consisting of: an engine, a differential, a transmission, a transfer case, a propeller shaft, an axle half shaft, a power transfer unit or a drive shaft.

3. The vehicle connect and disconnect system of claim 1 , wherein said stub shaft has a first position and a second position;
wherein at said first position said plurality of clutch teeth on said second end portion of said stub shaft are not meshingly engaged with said plurality of clutch teeth on said first end portion of said second shaft defining a gap therebetween; and
wherein at said second position said plurality of clutch teeth on said second end portion of said stub shaft are meshingly engaged with said plurality of clutch teeth on said first end portion of said second shaft.

4. The vehicle connect and disconnect system of claim 1 , further comprising at least one retention washer having a first end, a second end, an inner surface and an outer surface;
wherein said at least one retention washer is disposed between said second end of said first bushing and a first end of said lead screw; and
wherein said at least one retention washer prevents said lead screw from axially moving off said stub shaft.

5. The vehicle connect and disconnect system of claim 1 , wherein at least a portion of said outer surface of said second end portion of said stub shaft has a larger diameter than said outer surface of said first end portion and said middle portion of said stub shaft.

6. The vehicle connect and disconnect system of claim 1 , wherein said first shaft further comprises a plurality of splines circumferentially extending from said outer surface of said second end portion of said first shaft;
wherein said inner surface of said stub shaft further comprises a plurality of splines circumferentially extending from said inner surface of said stub shaft; and
wherein said plurality of splines extending from said inner surface of said stub shaft are complementary to and mesh with said plurality of splines on said outer surface of said second end portion of said first shaft.

7. The vehicle connect and disconnect system of claim 1 , wherein said housing further comprises an opening;
wherein said opening extends from said outer surface of said housing to said inner surface of said housing; and
wherein said ring gear is disposed radially inward from said opening in said housing.

8. The vehicle connect and disconnect system of claim 1 , further comprising a third shaft having a first end portion and a second end portion;
wherein said second shaft further comprises an inner surface and an outer surface;
wherein said inner surface and said outer surface of said second shaft defines a hollow portion therein;
wherein at least a portion of said first end portion of said third shaft extends into said hollow portion of said second shaft; and
wherein said outer surface of said third shaft is connected to said inner surface of said second shaft.

9. The vehicle connect and disconnect system of claim 1 , further comprises at least one additional bushing having a first end, a second end, an inner surface and an outer surface;
wherein said inner surface and said outer surface of said at least one additional bushing defines a hollow portion therein; and
wherein said at least one additional bushing is disposed between said inner surface of said lead screw and said outer surface of said stub shaft.

10. The vehicle connect and disconnect system of claim 1 , further comprising a sliding collar having a first end, a second end, an inner surface and an outer surface;
wherein said inner surface and said outer surface of said sliding collar defines a hollow portion therein; and
wherein said sliding collar is disposed between said inner surface of said lead screw and said outer surface of said stub shaft.

11. The vehicle connect and disconnect system of claim 10 , wherein said sliding collar further includes a channel that is cut into said outer surface of said sliding collar; and
wherein said channel extends circumferentially along said outer surface of said sliding collar.

12. The vehicle connect and disconnect system according to claim 10 or 11 , further comprising a lead screw collar having a first end, a second end, a first side and a second side;
wherein said lead screw collar circumferentially extends radially inward from said inner surface of said lead screw; and
wherein said second end of said lead screw collar at least partially extends into said channel in said outer surface of said sliding collar.

13. The vehicle connect and disconnect system of claim 12 , further comprises a first spring and a secon

Assignees

• Dana Automotive Systems Group

Inventors

• Cooper Kenneth E

Classifications

• F16D11/14 Primary

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

• F16D28/00

  Electrically-actuated clutches (arrangements for synchronisation F16D23/02; clutches actuated directly by means of an electromagnet F16D27/00; automatic clutches F16D43/00 - F16D45/00; external control F16D48/00) · CPC title

• B60B35/16

  Axle housings · CPC title

• F16D2023/123

  Clutch actuation by cams, ramps or ball-screw mechanisms · CPC title

• B60K23/08 Primary

  for changing number of driven wheels {, for switching from driving one axle to driving two or more axles (B60K17/3515 takes precedence)} · CPC title