Mechanical combustion-engine-driven fluid pump

Patent metadata

Field	Value
Publication number	US-9976606-B2
Application number	US-201214422701-A
Country	US
Kind code	B2
Filing date	Aug 23, 2012
Priority date	Aug 23, 2012
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A mechanical combustion-engine-driven fluid pump includes an input shaft driven by a combustion engine, a pumping unit comprising a pump rotor, and a clutch arranged between the input shaft and the pump rotor. The clutch comprises an input clutch body, an output clutch body, an electroconductive element, a permanent magnet element, and an actuator. The clutch transfers a rotation of the input clutch body to the output clutch body in an engaged clutch state. The closed clutch liquid gap is formed between the input clutch body and the output clutch body, and is filled with a magneto-rheological clutch liquid. The electroconductive element co-rotates with the output clutch body. The permanent magnet element co-rotates with the input clutch body and is shiftable between an engaged position and a disengaged position. The actuator moves the permanent magnet element between the engaged position and the disengaged position.

First claim

What is claimed is:

1. A mechanical combustion-engine-driven fluid pump comprising:
an input shaft configured to be directly driven by a combustion engine;
a pumping unit comprising a pump rotor; and
a clutch provided as a combined magneto-rheological and eddy-current clutch arranged between the input shaft and the pump rotor, the clutch comprising,
an input clutch body,
an output clutch body, the clutch being configured to transfer a rotation of the input clutch body to the output clutch body in an engaged clutch state,
a closed clutch liquid gap formed between the input clutch body and the output clutch body, the closed clutch liquid gap being filled with a magneto-rheological clutch liquid,
an electroconductive element configured to co-rotate with the output clutch body,
a permanent magnet element configured to co-rotate with the input clutch body and to be shiftable between,
an engaged position where a magnetic field of the permanent magnet element penetrates the closed clutch liquid gap with a high magnetic flux and the permanent magnet element is in a position which is close to the electroconductive element, and
a disengaged position where the magnetic field of the permanent magnet element in the closed clutch liquid gap is less than in the engaged position, and the permanent magnet element is in a position which is remote from the electroconductive element, and

an actuator configured to move the permanent magnet element between the engaged position and the disengaged position,

wherein,
the permanent magnet element does not contact the magneto-rheological clutch liquid.

2. The mechanical combustion-engine-driven fluid pump as recited in claim 1 , wherein the permanent magnet element is provided so as to be shiftable in an axial direction.

3. The mechanical combustion-engine-driven fluid pump as recited in claim 1 , wherein,
the input clutch body comprises an input clutch body axial guide,
the permanent magnet element comprises a shift body which comprises a permanent magnet body which comprises a permanent magnet body axial guide, and
the permanent magnet body axial guide is configured to interact with the input clutch body axial guide.

4. The mechanical combustion-engine-driven fluid pump as recited in claim 1 , wherein the electroconductive element is provided as a part of the output clutch body.

5. The mechanical combustion-engine-driven fluid pump as recited in claim 1 , wherein,
the input clutch body and the output clutch body are each configured to have a cup-shape so that the closed clutch liquid gap is provided as a cup-shaped gap defining a cup-shaped cavity between the input clutch body and the output clutch body, and
the permanent magnet element, in the engaged position, is positioned inside the cup-shaped cavity.

6. The mechanical combustion-engine-driven fluid pump recited in claim 1 , wherein the clutch is provided as a multi-disc clutch comprising at least two radial input disks and at least two radial output disks, the at least two radial input disks and the at least two radial output disks defining radial clutch liquid gaps therebetween.

7. The mechanical combustion-engine-driven fluid pump recited in claim 6 , wherein,
the at least two radial input disks are ferromagnetic, and
the at least two radial output disks are provided as electroconductive elements.

8. The mechanical combustion-engine-driven fluid pump as recited in claim 6 , wherein the at least two radial output disks each comprise an opening.

9. The mechanical combustion-engine-driven fluid pump as recited in claim 1 , further comprising a pretension element which is configured to pretension the permanent magnet element into the engaged position.

10. The mechanical combustion-engine-driven fluid pump as recited in claim 1 , wherein the actuator is an electromagnetic actuator.

11. The mechanical combustion-engine-driven fluid pump as recited in claim 1 , wherein the actuator is a vacuum actuator.

Assignees

• Squarcini Raffaele
• Bartalesi Elisa
• Armenio Giacomo
• Bucchi Francesco
• Rizzo Rocco
• Musolino Antonio
• Forte Paola
• Frendo Francesco
• Franceschini Alessandro
• Pierburg Pump Technology Gmbh

Inventors

• Squarcini Raffaele
• Bartalesi Elisa
• Armenio Giacomo
• Bucchi Francesco
• Rizzo Rocco
• Musolino Antonio
• Forte Paola
• Frendo Francesco
• Franceschini Alessandro

Classifications

• F16D37/02 Primary

  the particles being magnetisable · CPC title

• F04B17/05

  driven by internal-combustion engines · CPC title

• F16D27/01

  with permanent magnets · CPC title

• F16D2037/004

  characterised by multiple substantially axial gaps in which the fluid or medium consisting of small particles is arranged · CPC title

• F16D37/008

  the particles being carried by a fluid, to vary viscosity when subjected to electric change, i.e. electro-rheological or smart fluids (composition of such fluids C10M171/001) · CPC title