GB2167832A - Leaf springs - Google Patents

Leaf springs Download PDF

Info

Publication number
GB2167832A
GB2167832A GB08527985A GB8527985A GB2167832A GB 2167832 A GB2167832 A GB 2167832A GB 08527985 A GB08527985 A GB 08527985A GB 8527985 A GB8527985 A GB 8527985A GB 2167832 A GB2167832 A GB 2167832A
Authority
GB
United Kingdom
Prior art keywords
spring
end portion
clamping member
deformed
extending transversely
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB08527985A
Other versions
GB8527985D0 (en
GB2167832B (en
Inventor
Graham Hemmings
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GKN Technology Ltd
Original Assignee
GKN Technology Ltd
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 GKN Technology Ltd filed Critical GKN Technology Ltd
Publication of GB8527985D0 publication Critical patent/GB8527985D0/en
Publication of GB2167832A publication Critical patent/GB2167832A/en
Application granted granted Critical
Publication of GB2167832B publication Critical patent/GB2167832B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/02—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only
    • B60G11/10—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only characterised by means specially adapted for attaching the spring to axle or sprung part of the vehicle
    • B60G11/12—Links, pins, or bushes
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/366—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers made of fibre-reinforced plastics, i.e. characterised by their special construction from such materials
    • F16F1/368—Leaf springs
    • F16F1/3683—Attachments or mountings therefor
    • F16F1/3686—End mountings

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Springs (AREA)

Abstract

A leaf spring of composite, fibre reinforced plastics, material has an end fitting comprising an attachment member 14 lying in a recess 12 extending transversely of the end portion 11 of the spring, and a clamping member 15 extending around the end portion 11 and secured to the spring at 17 adjacent the end portion, wherein the clamping member 15 is deformed to interfit with the end portion 11 of the spring to take up production tolerances and assist in preventing relative movement. The clamping member may be pressed as at 18 into engagement with a depression 13 extending transversely of the end portion of the spring. Alternatively or in addition a side portion of the clamping member may be deformed as at 20 to engage an edge of the spring end portion. <IMAGE>

Description

SPECIFICATION Securing components to leaf springs of composite material This invention relates to lear springs made of composite, fibre reinforced plastics, material.
More particularly, the invention relates to an end fitting for such a spring, whereby a component may be secured to an end of such a spring.
Our European Patent Application Publication Number 0070122 discloses a leaf spring of composite material, with an end fitting comprising an attachment member lying within a recess extending transversely of the spring and defined by an end portion of the spring, and a clamping member extending around said attachment member and end portion of the spring and secured to the spring adjacent said end portion, to hold said attachment member in said recess. The attachment member may comprise a hollow tubular element or a metalrubber-metal bush to receive a mounting bolt.
The clamping member may be secured to the spring by, for example, a strap extending transversely around the spring and clamping member.
One characteristic of such an end fitting is that for security the attachment member must be tightly held within the recess in the end portion of the spring. This is assisted if the attachment member is itself secured, e.g. by welding, to the clamping member, but it is still necessary that the clamping member tightly embraces he end of the spring so that no relative movement therebetween is possible.
This is dependent on accurate maintenance of dimensional tolerances in production. It is the object of the present invention to provide an end fitting which is less exacting in this requirement.
According to the present invention, we provide a leaf spring of composite, fibre reinforced plastics material, having an end fitting comprising an attachment member lying within a recess extending transversely of the spring and defined by an end portion of the spring, and a clamping member extending around said attachment member and end portion of the spring and secured to the spring adjacent said end portion to hold said attachment member in said recess, wherein said clamping member includes at least one portion deformed to interfit with said end portion of the spring.
The end portion of the spring may be provided with at least one depression extending transversely thereof, into which the clamping member is deformed by a pressing operation.
Such deformation of the clamping member is advantageous, firstly because it takes up production tolerances to ensure that the clamping member fits tightly around the end portion of the spring and the attachment member. In addition, deformation of the clamping member to engage a depression in the spring assists in resisting relative movement between the clamping member and spring end portion.
As an alternative or additional mode of deformation of said clamping member, a side portion thereof may be deformed to engage an edge of said end portion of the spring.
Such engagement helps prevent relative movement between the clamping member and spring.
The invention will now be described by way of example with reference to the accompanying drawings, of which: Figure 1 is a side view of a spring. end fitting according to the invention; Figure 2 is a section on line 2-2 of Fig. 1.
Referring firstly to Fig. 1 of the drawings, there is shown part of a leaf spring 10 of composite, fibre reinforced plastics, material.
An end portion of the spring is indicated at 11, shaped to define a part cylindrical recess 12 extending transversely thereof. The end portion of the spring is formed to this shape in manufacture of the spring by a mould in which heat and pressure are applied to an assembly of fibres and plastics resin, to cure the resin and form the spring. On its surface opposite the recess 12, the end portion of the spring is formed, also in the moulding process, with a shallow depression 13 extending transversely thereof.
An attachment member 14 in the form of a hollow cylindrical bush lies in the recess 12 in the end portion of the spring. A clamping member 15 of sheet metal, e.g. steel, embraces the attachment member and end portion of the spring, and the free ends 16 of the clamping member lie against upper and lower surfaces of the spring adjacent its end portion. They are held to the spring by a strap 17 extending transversely around them and the spring. The strap may be secured by welding or deformation thereof.
According to the present invention, the clamping member 15 is deformed by a pressing operation, to enter the depression 13 in the spring end portion as indicated at 18. This pressing operation would be carried out by a suitably shaped press tool, after the clamping member is fitted and secured by strap 17.
The effect of this is to ensure that the end portion of the spring and attachment member 14 are tightly embraced by the clamping member, by taking up production tolerances.
Further, the inter-fitting between the portion 18 of the clamping member and the depression 13 in the spring end portion assists these parts against becoming displaced relative to one another.
If desired, more than one depression may be provided in the spring end portion, and the clamping member deformed by pressing into each such depression. As an alternative to the forming of such depression or depressions in the moulding process of spring manufacture, it would be possible to cut, e.g. by a suitable machine tool, the end portion of the spring to provide such formations.
A further possibility of deformation of the clamping member 15, which may be used alternatively or in addition to that above described, is shown particularly in Fig. 2 of the drawings. Here part of the end portion 11 of the spring is shown in section, and it will be noted that it has a rounded edge 19. The side of the clamping member 15 has a pressed out tag 20 which engages the edge 19 of the spring end portion. This helps resist relative lateral displacement between the clamping member and spring end portion.
Deformation of the clamping member as indicated at 20 may be carried out before or subsequent to assembly of the clamping member with the spring to form the end fitting assembly.

Claims (4)

1. A leaf spring of composite, fibre reinforced plastics material, having an end fitting comprising an attachment member lying within a recess extending transversely of the spring and defined by an end portion of the spring, and a clamping member extending around said attachment member and end portion of the spring and secured to the spring adjacent said end portion to hold said attachment member in said recess, wherein said clamping member includes at least one portion deformed to interfit with said end portion of the spring.
2. A leaf spring according to Claim 1 wherein said end portion of the spring is provided with at least one depression extending transversely thereof, into which the clamping member is deformed by a pressing operation.
3. A leaf spring according to Claim 1 or Claim 2 wherein said clamping member includes at least one side portion deformed to engage an edge of said spring end portion.
4. A leaf spring substantially as hereinbefore described with reference to the accompanying drawings.
GB08527985A 1984-11-29 1985-11-13 Leaf springs Expired GB2167832B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB848430109A GB8430109D0 (en) 1984-11-29 1984-11-29 Securing components

Publications (3)

Publication Number Publication Date
GB8527985D0 GB8527985D0 (en) 1985-12-18
GB2167832A true GB2167832A (en) 1986-06-04
GB2167832B GB2167832B (en) 1988-03-30

Family

ID=10570440

Family Applications (2)

Application Number Title Priority Date Filing Date
GB848430109A Pending GB8430109D0 (en) 1984-11-29 1984-11-29 Securing components
GB08527985A Expired GB2167832B (en) 1984-11-29 1985-11-13 Leaf springs

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB848430109A Pending GB8430109D0 (en) 1984-11-29 1984-11-29 Securing components

Country Status (2)

Country Link
JP (1) JPS61130637A (en)
GB (2) GB8430109D0 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0405307A1 (en) * 1989-06-27 1991-01-02 BASF Aktiengesellschaft Leaf spring of fibre composite material
US6995169B2 (en) 1999-11-19 2006-02-07 Reckitt Benckiser Healthcare (Uk) Limited Analgesic compositions containing buprenorphine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070122A1 (en) * 1981-07-15 1983-01-19 Gkn Technology Limited Leaf springs of composite material
EP0132074A1 (en) * 1983-07-16 1985-01-23 Gkn Technology Limited Leaf springs of composite material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070122A1 (en) * 1981-07-15 1983-01-19 Gkn Technology Limited Leaf springs of composite material
EP0132074A1 (en) * 1983-07-16 1985-01-23 Gkn Technology Limited Leaf springs of composite material
WO1985000643A1 (en) * 1983-07-16 1985-02-14 Gkn Technology Limited Leaf springs of composite material
GB2152628A (en) * 1983-07-16 1985-08-07 Gkn Technology Ltd Leaf springs of composite material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NOTE: EP A1 0132074 GB A 2152628 AND WO A1 8500643 ARE EQUIVALENT *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0405307A1 (en) * 1989-06-27 1991-01-02 BASF Aktiengesellschaft Leaf spring of fibre composite material
US6995169B2 (en) 1999-11-19 2006-02-07 Reckitt Benckiser Healthcare (Uk) Limited Analgesic compositions containing buprenorphine

Also Published As

Publication number Publication date
GB8527985D0 (en) 1985-12-18
JPS61130637A (en) 1986-06-18
GB2167832B (en) 1988-03-30
GB8430109D0 (en) 1985-01-09

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee