WO2004065837A1 - Hydraulic connections - Google Patents

Hydraulic connections Download PDF

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Publication number
WO2004065837A1
WO2004065837A1 PCT/IB2004/000140 IB2004000140W WO2004065837A1 WO 2004065837 A1 WO2004065837 A1 WO 2004065837A1 IB 2004000140 W IB2004000140 W IB 2004000140W WO 2004065837 A1 WO2004065837 A1 WO 2004065837A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
component
bore
hydraulic
plastics
Prior art date
Application number
PCT/IB2004/000140
Other languages
French (fr)
Inventor
Frederick Leger
Original Assignee
Automotive Products France S.A.
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 Automotive Products France S.A. filed Critical Automotive Products France S.A.
Priority to DE112004000154T priority Critical patent/DE112004000154T5/en
Publication of WO2004065837A1 publication Critical patent/WO2004065837A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/16—Screw-threaded joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/12—Details not specific to one of the before-mentioned types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/24—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with parts screwed directly on or into the hose
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/088—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a split elastic ring
    • F16L37/0885—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a split elastic ring with access to the split elastic ring from a radial or tangential opening in the coupling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D2048/0224—Details of conduits, connectors or the adaptors therefor specially adapted for clutch control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
    • F16D25/088—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member the line of action of the fluid-actuated members being distinctly separate from the axis of rotation

Definitions

  • This invention relates to hydraulic connections and in particular to connections between a hydraulic component such as a master cylinder, slave cylinder, damper connector or accumulator and plastics piping in a hydraulic circuit for the operation of a vehicle function such as a vehicle clutch.
  • a hydraulic component such as a master cylinder, slave cylinder, damper connector or accumulator and plastics piping in a hydraulic circuit for the operation of a vehicle function such as a vehicle clutch.
  • the component may be, for example, an end fitting or other hydraulic component such as a valve housing, cylinder body, part of a hydraulic connector or damper casing.
  • an end fitting or other hydraulic component such as a valve housing, cylinder body, part of a hydraulic connector or damper casing.
  • T-connectors, quick connectors or angled connectors can be connected with plastics piping using the present invention.
  • the component may be formed from glass reinforced plastic (eg Pa 6.6 GF 20) and the pipe may be formed from nylon (eg, Nylon 12).
  • glass reinforced plastic eg Pa 6.6 GF 20
  • nylon eg, Nylon 12
  • the component could be made from metal eg, aluminium.
  • the invention also provides a hydraulic circuit which includes one or more components connected with plastics piping by the above screwing method.
  • FIG. 1 is a schematic diagram of a vehicle clutch actuation system which includes several hydraulic connections according to the present invention:
  • Figure 2 shows on an enlarged scale a plan view of part of a hydraulic connection according to the present invention:
  • Figure 3 is an end view in the direction of C of Fig 2;
  • Figure 4 is a section on the line B-B of figure 3;
  • Figure 5 is a sectional view on the line A-A of figure 2 showing the connection used to connect a master cylinder to the system of Figure 1 , and
  • Figure 6 shows part of the arrangement shown in figure 5 on a larger scale.
  • FIG 1 this shows a clutch actuating system in which a master cylinder 10 operated by a pedal 11 is connected via plastic piping 12a, 12b with a slave cylinder 13 which operates a clutch release bearing 14 via a lever 15 which is pivoted at 16 on a clutch housing 17.
  • the release bearing 14 operates a belleville clutch clamping spring 18, which is shown diagrammatically in figure 1.
  • the master cylinder 10 is connected to a system reservoir 19 in the conventional manner and the slave cylinder 13 is mounted on the clutch housing 17 via a bracket 20.
  • the clutch is disengaged by depressing pedal 11 which expels fluid from the master cylinder 10 into slave cylinder 13 via piping 12a, 12b to pivot the lever 15 clockwise about pivot 16 and thus displace the clutch release bearing 14 to the left as in figure 1 to disengage the clutch.
  • the master cylinder 10 is connected with the piping section 12a via a connection part of which is shown in figure 5.
  • the plastics pipe 12a is screwed into a quick connect coupler portion 21 which is itself held captive in the other half 22 of the quick connect coupling which is formed integrally with master cylinder 10 by a generally U shaped wire connector 23 which engages slots 24 formed in the master cylinder and a circumferentially extending groove 25 in the quick connect coupler portion 21.
  • the present invention is concerned with the manner in which the plastics pipe 12a is connected with the connector portion 21. This connection is achieved by providing the coupler portion 21 with a tapering internal screw thread 26 into which the pipe 12a is screwed.
  • the coupler portion 21 is formed from a glass reinforced plastics material such as Pa 6.6 GF 20 which is harder than the material of which the plastic piping 12 is formed which is typically Nylon 12.
  • the thread 26 tapers from left to right with the entry root diameter ER being greater than the exit root diameter XR and the entry crest diameter EC being greater than the exit crest diameter XC.
  • ER is 8.16mm in diameter
  • XR is typically 7.56mm in diameter.
  • typical values for EC are 7.6mm and for XC 6.6mm.
  • the length of the bore is 16 mm and the external diameter of pipe 12a is 7.86 mm ⁇ 0.3 mm.
  • the internal bore 27 of connector portion 21 also tapers from left to right so that the radius of the bore tapers at an angle of approximately 1 °.
  • the quick connect portion 21 is provided with external generally hexagonal drive formations 28 formed thereon which are used to grip the quick connect portion and rotate this relative to the pipe 12a as the two components are connected.
  • a similar connection 21, 22 is provided between the slave cylinder-13 and-the piping 12b as indicated in figure 1.
  • the system is designed to be assembled in two halves, the first half comprising the master cylinder 10 and pipe portion 12a and the second half comprising the slave cylinder 13 and the pipe portion 12b. These two portions of the system are themselves connected by a connector arrangement 21a, 22a which is basically the same as that previously described with reference to figure 5.
  • a connector arrangement 21a, 22a which is basically the same as that previously described with reference to figure 5.
  • the piping portion 12b is screwed into the connector portion 21a as previously described with reference to figure 5 and the piping portion 12a is screwed into the second portion 22b of the connector which is internally threaded with a thread similar to the thread 26 described above.
  • piping 12a and connector portion 22a can be mounted on the vehicle chassis and the portion of the system comprising the slave cylinder 13 , piping 12b and quick connect portion 21a can be mounted on the vehicle engine which is subsequently lowered into the vehicle engine compartment.
  • the two halves of the system can be connected by introducing connector portion 21a into connector portion 22a to complete the system.
  • the system may be fitted without fluid (ie dry) or could be fitted with each half of the system pre-filled with hydraulic fluid and the connector portions 21a and 22b including valving preventing escape of the fluid from each respective half of the system until the two systems halves are joined.
  • Such a quick connect arrangement is well known and described for example in US Patent 4624290 or 4607670.
  • the present invention can be used to connect plastic piping to any component in a hydraulic circuit.
  • a hydraulic damper, quick connector or accumulator can be connected into the piping using a screw thread connection in accordance with the invention.
  • the component which is connected to the plastics piping, which is harder than the piping, may in certain circumstances be formed from metal such as aluminium.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

A method of connecting a hydraulic component (21) to a plastics hydraulic pipe (12a, 12b) by forming the component from a harder material than the pipe with an internally screwed bore (25) for reception of the pipe, the screw thread (26) formed in the bore being of a tapering form with the internal diameter of the bore decreasing with distance from the open end of bore, and screwing the component (21) onto the pipe (12a, 12b) with the component forming a complementary thread on the outside of the pipe as the component is screwed on. The method is particularly suitable for connecting a component such as a pipe end fitting, a pipe connector, a valve housing, a cylinder body or a damper casing formed from glass reinforced plastic or metal with a pipe formed from plastics material.

Description

HYDRAULIC CONNECTIONS
This invention relates to hydraulic connections and in particular to connections between a hydraulic component such as a master cylinder, slave cylinder, damper connector or accumulator and plastics piping in a hydraulic circuit for the operation of a vehicle function such as a vehicle clutch.
It is an object of the present invention to provide a method of connecting a hydraulic component to a plastics hydraulic pipe which is simple and cheap to carry out.
Thus according to the present invention there is provided a method of connecting a hydraulic component to a plastics hydraulic pipe comprising:-
- forming the component from a harder material than the pipe with an internally screwed bore for reception of the pipe, the screw thread formed in the bore being of a tapering form with the internal diameter of the bore decreasing with distance from the open end of bore, and
- screwing the component onto the pipe with the component forming a complementary thread on the outside of the pipe as the component is screwed on.
The component may be, for example, an end fitting or other hydraulic component such as a valve housing, cylinder body, part of a hydraulic connector or damper casing. For example, T-connectors, quick connectors or angled connectors can be connected with plastics piping using the present invention.
The component may be formed from glass reinforced plastic (eg Pa 6.6 GF 20) and the pipe may be formed from nylon (eg, Nylon 12).
The component could be made from metal eg, aluminium. The invention also provides a hydraulic circuit which includes one or more components connected with plastics piping by the above screwing method.
The present invention will now be described, by way of example only, with reference to the accompanying drawings in which:
Figure 1 is a schematic diagram of a vehicle clutch actuation system which includes several hydraulic connections according to the present invention:
Figure 2 shows on an enlarged scale a plan view of part of a hydraulic connection according to the present invention:
Figure 3 is an end view in the direction of C of Fig 2;
Figure 4 is a section on the line B-B of figure 3;
Figure 5 is a sectional view on the line A-A of figure 2 showing the connection used to connect a master cylinder to the system of Figure 1 , and
Figure 6 shows part of the arrangement shown in figure 5 on a larger scale.
Referring now to figure 1 , this shows a clutch actuating system in which a master cylinder 10 operated by a pedal 11 is connected via plastic piping 12a, 12b with a slave cylinder 13 which operates a clutch release bearing 14 via a lever 15 which is pivoted at 16 on a clutch housing 17. As is conventional the release bearing 14 operates a belleville clutch clamping spring 18, which is shown diagrammatically in figure 1.
The master cylinder 10 is connected to a system reservoir 19 in the conventional manner and the slave cylinder 13 is mounted on the clutch housing 17 via a bracket 20. The clutch is disengaged by depressing pedal 11 which expels fluid from the master cylinder 10 into slave cylinder 13 via piping 12a, 12b to pivot the lever 15 clockwise about pivot 16 and thus displace the clutch release bearing 14 to the left as in figure 1 to disengage the clutch.
In accordance with the present invention the master cylinder 10 is connected with the piping section 12a via a connection part of which is shown in figure 5. In this arrangement the plastics pipe 12a is screwed into a quick connect coupler portion 21 which is itself held captive in the other half 22 of the quick connect coupling which is formed integrally with master cylinder 10 by a generally U shaped wire connector 23 which engages slots 24 formed in the master cylinder and a circumferentially extending groove 25 in the quick connect coupler portion 21.
The present invention is concerned with the manner in which the plastics pipe 12a is connected with the connector portion 21. This connection is achieved by providing the coupler portion 21 with a tapering internal screw thread 26 into which the pipe 12a is screwed.
The coupler portion 21 is formed from a glass reinforced plastics material such as Pa 6.6 GF 20 which is harder than the material of which the plastic piping 12 is formed which is typically Nylon 12.
Details of the thread 26 are shown on a larger scale in figure 6. As can be seen the thread tapers from left to right with the entry root diameter ER being greater than the exit root diameter XR and the entry crest diameter EC being greater than the exit crest diameter XC. In a typical example, ER is 8.16mm in diameter and XR is typically 7.56mm in diameter. Similarly typical values for EC are 7.6mm and for XC 6.6mm. Typically the length of the bore is 16 mm and the external diameter of pipe 12a is 7.86 mm ± 0.3 mm. As can clearly be seen from figures 4, 5 and 6 the internal bore 27 of connector portion 21 also tapers from left to right so that the radius of the bore tapers at an angle of approximately 1 °. This enables the moulding cores used to form the quick attach component 21 to be easily withdrawn from the components to the left as viewed in the above referred to figures. The quick connect portion 21 is provided with external generally hexagonal drive formations 28 formed thereon which are used to grip the quick connect portion and rotate this relative to the pipe 12a as the two components are connected.
As will be appreciated rotation of the connector portion 21 relative to the pipe 12a results in deformation of the softer pipe 12a into a corresponding external screw thread formation which seals the connection between the pipe and the connector portion 21. The connector portion 21 is sealed within the connector portion 22 formed integrally with master cylinder 10 by an "O" ring seal 29.
A similar connection 21, 22 is provided between the slave cylinder-13 and-the piping 12b as indicated in figure 1.
The system is designed to be assembled in two halves, the first half comprising the master cylinder 10 and pipe portion 12a and the second half comprising the slave cylinder 13 and the pipe portion 12b. These two portions of the system are themselves connected by a connector arrangement 21a, 22a which is basically the same as that previously described with reference to figure 5. In this arrangement the piping portion 12b is screwed into the connector portion 21a as previously described with reference to figure 5 and the piping portion 12a is screwed into the second portion 22b of the connector which is internally threaded with a thread similar to the thread 26 described above.
In such an arrangement the portion of the system comprising the master cylinder 10, piping 12a and connector portion 22a can be mounted on the vehicle chassis and the portion of the system comprising the slave cylinder 13 , piping 12b and quick connect portion 21a can be mounted on the vehicle engine which is subsequently lowered into the vehicle engine compartment. After the mounting of the engine in the engine compartment the two halves of the system can be connected by introducing connector portion 21a into connector portion 22a to complete the system. The system may be fitted without fluid (ie dry) or could be fitted with each half of the system pre-filled with hydraulic fluid and the connector portions 21a and 22b including valving preventing escape of the fluid from each respective half of the system until the two systems halves are joined. Such a quick connect arrangement is well known and described for example in US Patent 4624290 or 4607670.
As will be appreciated the present invention can be used to connect plastic piping to any component in a hydraulic circuit. For example, a hydraulic damper, quick connector or accumulator can be connected into the piping using a screw thread connection in accordance with the invention. Also, the component which is connected to the plastics piping, which is harder than the piping, may in certain circumstances be formed from metal such as aluminium.

Claims

1. a method of connecting a hydraulic component to a plastics hydraulic pipe comprising:-
- forming the component from a harder material than the pipe with an internally screwed bore for reception of the pipe, the screw thread formed in the bore being of a tapering form with the internal diameter of the bore decreasing with distance from the open end of bore, and
- screwing the component onto the pipe with the component forming a complementary thread on the outside of the pipe as the component is screwed on.
2. A method according to claim 1 in which the hydraulic component comprises a pipe end fitting, a pipe connector, a valve housing, a cylinder body or a damper casing.
3. A method according to claim 1 or 2 in which the component is formed from glass reinforced plastic and the pipe is formed from nylon.
4. A method according to claim 1 or 2 in which the component is made from a metal.
5. A hydraulic circuit which includes one or more components connected with plastics piping by a method according to any one of claims 1 to 4.
6. A clutch actuator connected with plastics piping by a method according to any one of claims 1 to 4.
PCT/IB2004/000140 2003-01-23 2004-01-15 Hydraulic connections WO2004065837A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112004000154T DE112004000154T5 (en) 2003-01-23 2004-01-15 Hydraulic connections

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0301517.9A GB0301517D0 (en) 2003-01-23 2003-01-23 Hydraulic connections
GB0301517.9 2003-01-23

Publications (1)

Publication Number Publication Date
WO2004065837A1 true WO2004065837A1 (en) 2004-08-05

Family

ID=9951633

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2004/000140 WO2004065837A1 (en) 2003-01-23 2004-01-15 Hydraulic connections

Country Status (3)

Country Link
DE (1) DE112004000154T5 (en)
GB (1) GB0301517D0 (en)
WO (1) WO2004065837A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3027636A1 (en) * 2014-10-22 2016-04-29 Peugeot Citroen Automobiles Sa PIPE FOR HYDRAULIC CLUTCH CONTROL COMPRISING A PLASTIC PIPE AND A FLEXIBLE PIPE

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB772208A (en) * 1955-02-10 1957-04-10 Cecil George Lemon Improvements in and relating to clamping rings for tubing
US3964772A (en) * 1969-04-24 1976-06-22 Ideal Industries, Inc. Connector for flexible metallic conduit and method
US4607670A (en) * 1983-11-28 1986-08-26 Automotive Products Plc Modular prefilled hydraulic control apparatus
US4624290A (en) * 1983-11-28 1986-11-25 Automotive Products Plc Prefilled hydraulic control apparatus for motor vehicle
EP0472056A1 (en) * 1990-08-21 1992-02-26 Thermconcept Produkte für Heizung und Sanitär GmbH & Co. Jointing element for pipes
US6364368B1 (en) * 1999-10-20 2002-04-02 Marion D. Kilgore Internal flush coupling for composite coiled tubing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB772208A (en) * 1955-02-10 1957-04-10 Cecil George Lemon Improvements in and relating to clamping rings for tubing
US3964772A (en) * 1969-04-24 1976-06-22 Ideal Industries, Inc. Connector for flexible metallic conduit and method
US4607670A (en) * 1983-11-28 1986-08-26 Automotive Products Plc Modular prefilled hydraulic control apparatus
US4624290A (en) * 1983-11-28 1986-11-25 Automotive Products Plc Prefilled hydraulic control apparatus for motor vehicle
EP0472056A1 (en) * 1990-08-21 1992-02-26 Thermconcept Produkte für Heizung und Sanitär GmbH & Co. Jointing element for pipes
US6364368B1 (en) * 1999-10-20 2002-04-02 Marion D. Kilgore Internal flush coupling for composite coiled tubing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3027636A1 (en) * 2014-10-22 2016-04-29 Peugeot Citroen Automobiles Sa PIPE FOR HYDRAULIC CLUTCH CONTROL COMPRISING A PLASTIC PIPE AND A FLEXIBLE PIPE

Also Published As

Publication number Publication date
DE112004000154T5 (en) 2007-01-18
GB0301517D0 (en) 2003-02-19

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