WO2008093178A3 - An improved friction screw mechanism - Google Patents

An improved friction screw mechanism Download PDF

Info

Publication number
WO2008093178A3
WO2008093178A3 PCT/IB2007/055284 IB2007055284W WO2008093178A3 WO 2008093178 A3 WO2008093178 A3 WO 2008093178A3 IB 2007055284 W IB2007055284 W IB 2007055284W WO 2008093178 A3 WO2008093178 A3 WO 2008093178A3
Authority
WO
WIPO (PCT)
Prior art keywords
screw
flanks
threads
screw nut
nut
Prior art date
Application number
PCT/IB2007/055284
Other languages
French (fr)
Other versions
WO2008093178A2 (en
Inventor
Emmanuel Eyraud
Daniele Volpiano
Original Assignee
Skf Ab
Emmanuel Eyraud
Daniele Volpiano
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Skf Ab, Emmanuel Eyraud, Daniele Volpiano filed Critical Skf Ab
Publication of WO2008093178A2 publication Critical patent/WO2008093178A2/en
Publication of WO2008093178A3 publication Critical patent/WO2008093178A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/04—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting mechanically
    • B60T11/046—Using cables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/02—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with mechanical assistance or drive

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transmission Devices (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)

Abstract

A friction screw mechanism (20) for a linear electromechanical actuator comprises a rotatable screw nut (21) and a translatable output screw (22). The screw and the screw nut have threads with respective first facing flanks (21a, 22a) which engage against each other when the mechanism is operated so as to impart to the screw (22) a translatory movement which produces a traction force (F1), and respective second facing flanks (21b, 22b) arranged on the other sides of the threads. The screw mechanism has, associated therewith, a resilient part (40, 140) able to exert on the screw or on the screw nut (21, 22) a thrust (F2) which moves axially the first flanks (21a) of the screw nut (21) away from the first flanks (22a) of the screw (22) and at the same time moves towards each other the second flanks (21b, 22b) of the threads. This relative movement of the screw and screw nut allows the lubricating grease situated at the interface between the threads to flow onto the first flanks, which work under load, and to areas where lubrication is of vital importance for the working life and efficiency of the mechanism.
PCT/IB2007/055284 2007-01-30 2007-12-21 An improved friction screw mechanism WO2008093178A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2007A000064 2007-01-30
ITTO20070064 ITTO20070064A1 (en) 2007-01-30 2007-01-30 SCREW MECHANISM WITH PERFECT FRICTION.

Publications (2)

Publication Number Publication Date
WO2008093178A2 WO2008093178A2 (en) 2008-08-07
WO2008093178A3 true WO2008093178A3 (en) 2008-09-25

Family

ID=39531341

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/055284 WO2008093178A2 (en) 2007-01-30 2007-12-21 An improved friction screw mechanism

Country Status (2)

Country Link
IT (1) ITTO20070064A1 (en)
WO (1) WO2008093178A2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3303261A1 (en) * 1983-02-01 1984-08-02 Bengel, Brigitte, 7148 Remseck Device for transmitting longitudinal movements in a flexible or stiff guide sleeve
EP0236546A2 (en) * 1986-03-14 1987-09-16 FIAT AUTO S.p.A. A flexible transmission device, particularly for control devices

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3303261A1 (en) * 1983-02-01 1984-08-02 Bengel, Brigitte, 7148 Remseck Device for transmitting longitudinal movements in a flexible or stiff guide sleeve
EP0236546A2 (en) * 1986-03-14 1987-09-16 FIAT AUTO S.p.A. A flexible transmission device, particularly for control devices

Also Published As

Publication number Publication date
WO2008093178A2 (en) 2008-08-07
ITTO20070064A1 (en) 2008-07-31

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