Electro-hydraulic limited slip differential system

Patent metadata

Field	Value
Publication number	US-10753447-B2
Application number	US-201815928688-A
Country	US
Kind code	B2
Filing date	Mar 22, 2018
Priority date	Apr 28, 2016
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

An electro-hydraulic limited slip differential system for a vehicle includes an axle assembly having an axle housing having an aperture formed therein, and an electro-hydraulic limited slip differential assembly disposed within the axle housing. The limited slip differential assembly includes a differential case, a differential gear assembly disposed in the differential case, a clutch assembly having a clutch pack and a clutch actuator assembly, and a hydraulic fitting disposed at least partially within the aperture. The hydraulic fitting is coupled to a hydraulic port of the clutch actuator assembly.

First claim

What is claimed is:

1. A hydraulic control unit (HCU) assembly for an electro-hydraulic limited slip differential system for a vehicle, the HCU assembly comprising:
a support bracket configured to couple to an underbody of the vehicle in a location remote from a live axle assembly of the vehicle; and
an HCU including a combined accumulator and reservoir assembly, a control valve assembly, and a motor and hydraulic pump assembly, the HCU coupled to the support bracket,
wherein the support bracket comprises a base wall and a rear wall, and
wherein the integrated accumulator and reservoir assembly includes a housing having a protrusion extending outwardly therefrom, the protrusion disposed against the support bracket base wall and configured to receive a fastener to couple the housing to the support bracket.

2. The HCU assembly of claim 1 , wherein the integrated accumulator and reservoir assembly and the motor and hydraulic pump assembly are arranged end-to-end such that the HCU extends generally along a first longitudinal axis.

3. The HCU assembly of claim 2 , wherein the first longitudinal axis is substantially parallel to a cross-car axis of the vehicle.

4. The HCU assembly of claim 2 , wherein the integrated accumulator and reservoir assembly extends along a second longitudinal axis, the control valve assembly extends along a third longitudinal axis, and the motor and hydraulic pump assembly extends along a fourth longitudinal axis,
wherein the second, third, and fourth axes are substantially parallel to the first longitudinal axis.

5. A hydraulic control unit (HCU) assembly for an electro-hydraulic limited slip differential system for a vehicle, the HCU assembly comprising:
a support bracket configured to couple to an underbody of the vehicle in a location remote from a live axle assembly of the vehicle; and
an HCU including a combined accumulator and reservoir assembly, a control valve assembly, and a motor and hydraulic pump assembly, the HCU coupled to the support bracket,
wherein the support bracket comprises a base wall and a rear wall, and
wherein the support bracket includes a tab having an aperture, and wherein the integrated accumulator and reservoir assembly includes a housing having a receiving aperture formed therein, the receiving aperture aligned with the tab aperture and configured to receive a fastener to couple the housing to the support bracket, wherein the tab extends from one of the support bracket rear wall and the support bracket base wall, wherein the base wall includes an indentation formed therein and configured to provide clearance to a portion of the HCU, wherein the indentation includes a drain aperture configured to drain fluid accumulating in the indentation.

6. The HCU assembly of claim 5 , wherein the rear wall includes a first surface and an opposite second surface, wherein the rear wall defines a first connecting tab and a second connecting tab each configured to abut against a portion of the vehicle underbody to couple the support bracket to the vehicle.

7. The HCU assembly of claim 6 , further comprising a third connecting tab configured to couple to the HCU, and a fourth connecting tab configured to couple to the portion of the vehicle underbody, wherein the third connecting tab extends outwardly from the first surface, and the fourth connecting tab extends outwardly from the second surface.

8. A hydraulic control unit (HCU) assembly for an electro-hydraulic limited slip differential system for a vehicle, the HCU assembly comprising:
a support bracket configured to couple to an underbody of the vehicle in a location remote from a live axle assembly of the vehicle; and
an HCU including a combined accumulator and reservoir assembly, a control valve assembly, and a motor and hydraulic pump assembly, the HCU coupled to the support bracket,
wherein the support bracket comprises a base wall and a rear wall, and
an insert assembly disposed within a tab aperture and configured to dampen relative movement between the HCU and the support bracket, the insert assembly including an internal sleeve disposed radially within a grommet.

Assignees

• Eaton Corp

Inventors

• Edler Andrew N
• Wadhva Ashish
• St John Brian
• Kawala Kandice
• Graves Randy
• Fisher Daniel P

Classifications

• F16H57/037

  Gearboxes for accommodating differential gearings (rotating cases for differential gearings F16H48/40) · CPC title

• F16H48/27

  using internally-actuatable fluid pressure, e.g. internal pump types · CPC title

• F16H48/22 Primary

  using friction clutches or brakes · CPC title

• F16H48/32

  using fluid pressure actuators · CPC title

• F16H48/38

  Constructional details (the outer casing comprising the differential and supporting input and output shafts F16H57/037) · CPC title