WO2009070019A1 - Method and tyre building drum for building a tyre - Google Patents

Method and tyre building drum for building a tyre Download PDF

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Publication number
WO2009070019A1
WO2009070019A1 PCT/NL2008/050751 NL2008050751W WO2009070019A1 WO 2009070019 A1 WO2009070019 A1 WO 2009070019A1 NL 2008050751 W NL2008050751 W NL 2008050751W WO 2009070019 A1 WO2009070019 A1 WO 2009070019A1
Authority
WO
WIPO (PCT)
Prior art keywords
segment
steering
bead ring
folding arm
tyre
Prior art date
Application number
PCT/NL2008/050751
Other languages
French (fr)
Inventor
Henk-Jan Grolleman
Luuk Van Tienen
Jakob Pieter De Vries
Original Assignee
Vmi Holland B.V.
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=40280720&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2009070019(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from NL2001031A external-priority patent/NL2001031C2/en
Application filed by Vmi Holland B.V. filed Critical Vmi Holland B.V.
Priority to AT08854000T priority Critical patent/ATE553915T1/en
Priority to CN200880117719.6A priority patent/CN101873925B/en
Priority to RU2010120764/05A priority patent/RU2472623C2/en
Priority to JP2010534904A priority patent/JP2011504428A/en
Priority to KR1020107014204A priority patent/KR101418917B1/en
Priority to BRPI0819760 priority patent/BRPI0819760A2/en
Priority to EP08854000A priority patent/EP2217434B1/en
Publication of WO2009070019A1 publication Critical patent/WO2009070019A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/24—Drums
    • B29D30/244—Drums for manufacturing substantially cylindrical tyre components with cores or beads, e.g. carcasses
    • B29D30/246—Drums for the multiple stage building process, i.e. the building-up of the cylindrical carcass is realised on one drum and the toroidal expansion is realised after transferring on another drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
    • B29D2030/3221—Folding over means, e.g. bladders or rigid arms
    • B29D2030/3264—Folding over means, e.g. bladders or rigid arms using radially expandable, contractible mechanical means, e.g. circumferentially spaced arms, spring rollers, cages

Definitions

  • the invention relates to a method for building an unvulcanised tyre using tyre components of rubber, in which method a tyre building drum is used having a longitudinal axis and provided with two bead ring segments placed around the longitudinal axis and spaced apart from each other, wherein each bead ring segment is intended for supporting a bead ring core, with means for radially expanding a part of the tyre components placed between the ring segments, wherein the tyre building drum comprises a set of axially extending folding arms on each side outside of the bead ring segments, wherein each folding arm is provided with a first end oriented to the bead ring segment in question and provided with a roller element for directly contacting a tyre component, and wherein each folding arm at a second end facing away from the bead ring segment in question is connected via a swivel axle to a longitudinally slidable annular folding arm segment placed around the longitudinal axis, wherein
  • roller elements of the sets of arms form an at least substantially closed ring, which when the folding arms move towards the bead ring segments fold the part of the tyre components situated outside of the bead ring segments, below also called the outer tyre components, over the bead ring core and press it against the bead ring core and against the part of the tyre components situated within the bead ring segments, below also called the inner tyre components.
  • the roller elements form undesirable imprints in the tyre when certain types of tyre components are used.
  • the method comprises the step of designing the tyre building drum such that the means for axially and radially moving each set of folding arms comprise a longitudinally slidable annular steering segment which is provided with a sloping steering surface which in axial direction of a bead ring segment in question slopes to the outside in the direction away from the longitudinal axis, wherein each folding arm is provided with a steering element situated between both ends of the folding arm which steering element can be made to abut the steering surface, and wherein the annular steering segment is provided with a stop for an annular folding arm segment, wherein the annular folding arm segment is situated between the annular steering segment in question and the bead ring segment in question, wherein in the first position of the folding arms the stop of the annular steering segment is situated spaced apart from the annular folding arm segment, and in that the method comprises the step of choosing the mutual distances such considered in axial direction between a bead ring segment, the first end and the steering element of a folding
  • the steering element Due to the use of the steering element, that may be designed as a cam, a roller or another form of a cam follower that is known per se, the steering element provides as it were an extra rotation point for the folding arm. Said extra rotation point when engaged by the sloping steering surface becomes an extra point of application of forces, as a result of which, depending on the size of the slope of the steering surface, the axial force exerted by the roller element on the outer tyre components, also called side wall, is considerably reduced as a result of which the risk of imprints is strongly reduced and may even be completely absent.
  • An additional advantage of said extra point of rotation i.e.
  • the steering element is that it ensures that during the first part of folding the swivel axle is able to move freely, as a result of which the roller element is free to follow the contour of the outer tyre components, which is advantageous in case of outer tyre components provided with a thickening.
  • a tyre building drum having a so-called annular bladder which is arranged on the outer sides around the folding arms.
  • the size of the slope and the mutual distance between the relevant elements should be chosen such that the folding arm in the first part of folding tensions the bladder so that the bladder presses the outer tyre components against the bead ring core. In the first part of folding the roller elements therefore do not press the outer tyre components directly against the inner tyre components.
  • the method further comprises the step of designing the tyre building drum such that the roller element and the steering element of a folding arm in the first position of the folding arm are situated at least substantially at the same radial distance from the longitudinal axis.
  • the method further comprises the step of designing the tyre building drum such that in the first position of the folding arm the swivel axle of the folding arm is situated at a shorter radial distance from the longitudinal axis than the roller element and the steering element are.
  • the method comprises the step of choosing the size of the slope of the steering surface such that when moving the steering segment towards the bead ring segment a desired axial pressure on the tyre components is realised.
  • the steeper the slope of the steering surface the larger the axial component of the force exerted on the outer tyre components by the roller element.
  • the invention furthermore relates to a tyre building drum having a longitudinal axis and provided with two bead ring segments placed around the longitudinal axis and spaced apart from each other, wherein each bead ring segment is intended for supporting a bead ring core, with means for radially expanding a part of the tyre components placed between the ring segments, wherein the tyre building drum comprises a set of axially extending folding arms on each side outside of the bead ring segments, wherein each folding arm is provided with a first end oriented to the bead ring segment in question and provided with a roller element, and wherein each folding arm at a second end facing away from the bead ring segment in question is connected via a swivel axle to a longitudinally slidable annular folding arm segment placed around the longitudinal axis, wherein the tyre building drum is furthermore provided with means for axially and radially moving each set of arms from a first position, in which the roller elements
  • the roller element and the steering element of a folding arm in the first position of the folding arm are situated at least substantially at the same radial distance from the longitudinal axis.
  • the swivel axle of the folding arm is situated at a shorter radial distance from the longitudinal axis than the roller element and the steering element are.
  • Figure 1 shows a schematic cross-section of a part of a tyre building drum for building an unvulcanised tyre wherein the folding arms are in the first, the inactive, position, and
  • Figure 2 shows a schematic cross-section of a part of a tyre building drum for building an unvulcanised tyre wherein the folding arms are in a position in which the outer tyre components are pressed against the bead ring core.
  • the invention among others relates to a method for building an unvulcanised tyre using tyre components of rubber, such as for instance known from EP-B1 -1 .272.338.
  • a tyre building drum 1 is used of which in figures 1 and 2 only the upper right part is shown.
  • the other parts, as known, are designed symmetrical with respect to said part.
  • the tyre building drum 1 has a longitudinal axis 2 and is provided with two bead ring segments 3 (of which one is shown in the figures), which are placed around the longitudinal axis 2 and are spaced apart from each other. Each bead ring segment 3 is intended for supporting a bead ring core 4 optionally provided with a filling strip 5.
  • the tyre building drum 1 further comprises means that are known per se and not shown in the figures, for radially expanding a part of the tyre components 6 placed between the bead ring segments 3.
  • the tyre building drum 1 On each side outside of the bead ring segments 3 the tyre building drum 1 comprises a set of axially extending folding arms 7 (of which one is shown in the figures). Each folding arm 7 is provided with a first end oriented towards the bead ring segment 3 in question and provided with a roller element 8 able to directly contact a tyre component. Each folding arm 7 furthermore at a second end facing away from the bead ring segment 3 in question has a swivel axle 9 with which said folding arm 7 is connected to a longitudinally slidable annular folding arm segment 10 placed around the longitudinal axis 2.
  • the tyre building drum 1 is furthermore provided with means for axially and radially moving each set of arms 7 from a first (inactive) position (shown in figure 1 ) in which the roller elements 8 of the set of arms 7 form an at least substantially closed ring, to a second position (shown in figure 2) for pressing a part 1 1 of the tyre components placed outside of the bead ring segments 3 against the expanded part 6 of the tyre components placed within the bead ring segments 3.
  • the outer part 1 1 of the tyre components contains a thickening, such as for instance used in tyres intended for off-the- road use.
  • the movement of the arms towards the bead ring segments may for instance, and as known per se, be realised by for instance pneumatic drives or comparable drives.
  • each set of folding arms 7 comprises a longitudinally slidable annular steering segment 1 2 that is provided with sloping steering surface 1 3 which in axial direction of a bead ring segment 3 in question slopes to the outside in the direction away from the longitudinal axis 2.
  • each folding arm 7 is provided with a steering element 14 situated between both ends of the folding arm 7, which steering element can be made to abut the steering surface 13. Due to the use of the steering element 14, that may be designed as a cam, a roller or another form of a cam follower that is known per se, the steering element 14 provides as it were an extra rotation point for the folding arm 7.
  • the steering element 14 is that it ensures that during the first part of folding the swivel axle 9 is able to move freely, as a result of which the roller element 8 is free to follow the contour of the outer tyre components 1 1 , which is advantageous in case of outer tyre components provided with a thickening.
  • the annular steering segment 12 is furthermore provided with a stop 15 (a stop surface in the embodiment shown) for an annular folding arm segment 10.
  • the annular folding arm segment 10 is in this case situated between the annular steering segment 12 in question (its stop surface 1 5) and the bead ring segment 3 in question.
  • the stop 15 of the annular steering segment 1 2 is spaced apart from the annular folding arm segment 10.
  • the mutual distances considered in axial direction between a bead ring segment 3, the first end (8) and the steering element 14 of a folding arm 7 in question are chosen such that from the situation in which the folding arms 7 are in the first position (as shown in figure 1 ) at movement of the steering segment 12 towards the bead ring segment 3, the steering surface 13 will come to abut the steering element 14 so that the roller element 8 is moved from the first position.
  • the size of the slope of the steering surface 13 defines the size of the axial force exerted on the tyre components by the roller element 8 when the steering segment 12 moves to the bead ring segment 3.
  • the size of said axial force can therefore be adjusted to a desired axial pressure.
  • roller element 8 and the steering element 13 of a folding arm 7 in the first position (shown in figure 1 ) of the folding arm 7, are situated at at least substantially the same radial distance from the longitudinal axis 2.
  • a proper, reproducible distribution of the force exerted on the tyre components by the roller element 8 is achieved.
  • the swivel axle 9 of the folding arm 7 is situated at a shorter radial distance from the longitudinal axis 2 than the roller element 8 and the steering element 13 are.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Tyre Moulding (AREA)

Abstract

When building an unvulcanised tyre from tyre components using a tyre building drum (1), the mutual distances considered in axial direction between a bead ring segment (3), a first end and a steering element (14) of a folding arm (7) in question are chosen such that at: movement of a steering element (12) towards the bead ring segment (3) a steering surface (13) comes to abut the steering element (14) so that a roller element (8) can be moved from a first position, after which the roller element presses an outer part of the tyre components against a bead ring core to be placed on the bead ring segment while simultaneously the roller element moves away from the longitudinal axis, wherein the steering element moves along the steering surface until the stop of the annular steering segment abuts an annular folding arm segment, after which the folding arm swivels about a swivel axle (9) and the steering element comes to lie apart from the steering surface.

Description

Method and tyre building drum for building a tyre
BACKGROUND OF THE INVENTION
The invention relates to a method for building an unvulcanised tyre using tyre components of rubber, in which method a tyre building drum is used having a longitudinal axis and provided with two bead ring segments placed around the longitudinal axis and spaced apart from each other, wherein each bead ring segment is intended for supporting a bead ring core, with means for radially expanding a part of the tyre components placed between the ring segments, wherein the tyre building drum comprises a set of axially extending folding arms on each side outside of the bead ring segments, wherein each folding arm is provided with a first end oriented to the bead ring segment in question and provided with a roller element for directly contacting a tyre component, and wherein each folding arm at a second end facing away from the bead ring segment in question is connected via a swivel axle to a longitudinally slidable annular folding arm segment placed around the longitudinal axis, wherein the tyre building drum is furthermore provided with means for axially and radially moving each set of arms from a first position, in which the roller elements of the set of arms form an at least substantially closed ring, to a second position, for pressing a part of the tyre components placed outside of the bead ring segments against the expanded part of the tyre components placed within the bead ring segments.
Such a method is known from EP-B1 -1 .272.338. In the method described therein the roller elements of the sets of arms form an at least substantially closed ring, which when the folding arms move towards the bead ring segments fold the part of the tyre components situated outside of the bead ring segments, below also called the outer tyre components, over the bead ring core and press it against the bead ring core and against the part of the tyre components situated within the bead ring segments, below also called the inner tyre components. Although the known method functions adequately in general, the roller elements form undesirable imprints in the tyre when certain types of tyre components are used. Said imprints arise because the roller elements that are in direct contact with the tyre components exert too high a force on the tyre components. Particularly in case of tyres having a thickening in the outer tyre components, such as among others off-the-road tyres, there is a risk of said undesirable imprints arising.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method for building a tyre, wherein despite the use of roller elements that contact the tyre components directly it is prevented that imprints arise in the tyre components.
According to the invention this object is achieved because the method comprises the step of designing the tyre building drum such that the means for axially and radially moving each set of folding arms comprise a longitudinally slidable annular steering segment which is provided with a sloping steering surface which in axial direction of a bead ring segment in question slopes to the outside in the direction away from the longitudinal axis, wherein each folding arm is provided with a steering element situated between both ends of the folding arm which steering element can be made to abut the steering surface, and wherein the annular steering segment is provided with a stop for an annular folding arm segment, wherein the annular folding arm segment is situated between the annular steering segment in question and the bead ring segment in question, wherein in the first position of the folding arms the stop of the annular steering segment is situated spaced apart from the annular folding arm segment, and in that the method comprises the step of choosing the mutual distances such considered in axial direction between a bead ring segment, the first end and the steering element of a folding arm in question, that from the situation in which the folding arms are in the first position when moving the steering segment towards the bead ring segment, the steering surface will come to abut the steering element so that the roller element is moveable from the first position, after which at further movement of the steering segment towards the bead ring segment the roller element at the first end of the folding arm presses the part of the tyre components outside of the bead ring segments against a bead ring core to be placed on the bead ring segment while simultaneously the roller element moves away from the longitudinal axis, wherein the steering element moves along the steering surface until the stop of the annular steering segment comes to abut the annular folding arm segment, after which the folding arm swivels about the swivel axle and the steering element comes to lie apart from the steering surface. Due to the use of the steering element, that may be designed as a cam, a roller or another form of a cam follower that is known per se, the steering element provides as it were an extra rotation point for the folding arm. Said extra rotation point when engaged by the sloping steering surface becomes an extra point of application of forces, as a result of which, depending on the size of the slope of the steering surface, the axial force exerted by the roller element on the outer tyre components, also called side wall, is considerably reduced as a result of which the risk of imprints is strongly reduced and may even be completely absent. An additional advantage of said extra point of rotation, i.e. the steering element, is that it ensures that during the first part of folding the swivel axle is able to move freely, as a result of which the roller element is free to follow the contour of the outer tyre components, which is advantageous in case of outer tyre components provided with a thickening.
Please note that the use of an extra steering element and a steering surface is known per se from US-A-3.887.423. In the method described in said document, however, a tyre building drum is used having a so-called annular bladder which is arranged on the outer sides around the folding arms. The size of the slope and the mutual distance between the relevant elements, however, should be chosen such that the folding arm in the first part of folding tensions the bladder so that the bladder presses the outer tyre components against the bead ring core. In the first part of folding the roller elements therefore do not press the outer tyre components directly against the inner tyre components. By using such a bladder the creation of imprints is prevented. Not until the bead ring core has been passed during the folding arms moving to the inside, do the roller elements press the bladder against the central part of the inner tyre components. Indeed because it is the bladder and not the roller elements themselves, that press the outer tyre components against the bead ring core, the method described in US-A-3.887.423 may in some case not be optimal for folding and pressing the outer tyre components against the bead ring core. The techniques described in EP-B1 -1 .272.338 and US-A- 3.887.423 therefore are totally different.
In an advantageous embodiment of a method according to the invention the method further comprises the step of designing the tyre building drum such that the roller element and the steering element of a folding arm in the first position of the folding arm are situated at least substantially at the same radial distance from the longitudinal axis. In this way a better and reproducible distribution of the forces exerted on the outer tyre components by the roller element can be realised. An even better distribution can be achieved when the method further comprises the step of designing the tyre building drum such that in the first position of the folding arm the swivel axle of the folding arm is situated at a shorter radial distance from the longitudinal axis than the roller element and the steering element are.
In a further advantageous embodiment of a method according to the invention the method comprises the step of choosing the size of the slope of the steering surface such that when moving the steering segment towards the bead ring segment a desired axial pressure on the tyre components is realised. The steeper the slope of the steering surface, the larger the axial component of the force exerted on the outer tyre components by the roller element. By choosing the size of the slope of the steering surface it is therefore possible to realise a specific pressure force for specific tyre components. It is also possible to use a steering surface having a varying slope angle size to realise a certain development of the pressure force. The invention furthermore relates to a tyre building drum having a longitudinal axis and provided with two bead ring segments placed around the longitudinal axis and spaced apart from each other, wherein each bead ring segment is intended for supporting a bead ring core, with means for radially expanding a part of the tyre components placed between the ring segments, wherein the tyre building drum comprises a set of axially extending folding arms on each side outside of the bead ring segments, wherein each folding arm is provided with a first end oriented to the bead ring segment in question and provided with a roller element, and wherein each folding arm at a second end facing away from the bead ring segment in question is connected via a swivel axle to a longitudinally slidable annular folding arm segment placed around the longitudinal axis, wherein the tyre building drum is furthermore provided with means for axially and radially moving each set of arms from a first position, in which the roller elements of the set of arms form an at least substantially closed ring, to a second position, for pressing a part of the tyre components placed outside of the bead ring segments against the expanded part of the tyre components placed within the bead ring segments, wherein the means for axially and radially moving each set of arms comprise a longitudinally slidable annular steering segment provided with a sloping steering surface which in axial direction of a bead ring segment in question slopes to the outside in the direction away from the longitudinal axis, wherein each folding arm is provided with a steering element situated between both ends of the folding arm which steering element can be made to abut the steering surface, and wherein the annular steering segment is provided with a stop for an annular folding arm segment, wherein the annular folding arm segment is situated between the annular steering segment in question and the bead ring segment in question, wherein in the first position of the folding arms the stop of the annular steering segment is situated spaced apart from the annular folding arm segment, wherein the mutual distances considered in axial direction between a bead ring segment, the first end and the steering element of a folding arm in question have such a size that the method according to the invention can be carried out.
In an advantageous embodiment of a tyre building drum according to the invention the roller element and the steering element of a folding arm in the first position of the folding arm are situated at least substantially at the same radial distance from the longitudinal axis. In that case it is furthermore advantageous when in the first position of the folding arm the swivel axle of the folding arm is situated at a shorter radial distance from the longitudinal axis than the roller element and the steering element are.
SHORT DESCRIPTION OF THE DRAWINGS
The invention will be elucidated on the basis of a number of exemplary embodiments shown in the attached drawings, in which:
Figure 1 shows a schematic cross-section of a part of a tyre building drum for building an unvulcanised tyre wherein the folding arms are in the first, the inactive, position, and
Figure 2 shows a schematic cross-section of a part of a tyre building drum for building an unvulcanised tyre wherein the folding arms are in a position in which the outer tyre components are pressed against the bead ring core.
DETAILED DESCRIPTION OF THE DRAWINGS
The invention among others relates to a method for building an unvulcanised tyre using tyre components of rubber, such as for instance known from EP-B1 -1 .272.338.
In the method a tyre building drum 1 is used of which in figures 1 and 2 only the upper right part is shown. The other parts, as known, are designed symmetrical with respect to said part.
The tyre building drum 1 has a longitudinal axis 2 and is provided with two bead ring segments 3 (of which one is shown in the figures), which are placed around the longitudinal axis 2 and are spaced apart from each other. Each bead ring segment 3 is intended for supporting a bead ring core 4 optionally provided with a filling strip 5. The tyre building drum 1 further comprises means that are known per se and not shown in the figures, for radially expanding a part of the tyre components 6 placed between the bead ring segments 3.
On each side outside of the bead ring segments 3 the tyre building drum 1 comprises a set of axially extending folding arms 7 (of which one is shown in the figures). Each folding arm 7 is provided with a first end oriented towards the bead ring segment 3 in question and provided with a roller element 8 able to directly contact a tyre component. Each folding arm 7 furthermore at a second end facing away from the bead ring segment 3 in question has a swivel axle 9 with which said folding arm 7 is connected to a longitudinally slidable annular folding arm segment 10 placed around the longitudinal axis 2.
The tyre building drum 1 is furthermore provided with means for axially and radially moving each set of arms 7 from a first (inactive) position (shown in figure 1 ) in which the roller elements 8 of the set of arms 7 form an at least substantially closed ring, to a second position (shown in figure 2) for pressing a part 1 1 of the tyre components placed outside of the bead ring segments 3 against the expanded part 6 of the tyre components placed within the bead ring segments 3. In the embodiment shown the outer part 1 1 of the tyre components contains a thickening, such as for instance used in tyres intended for off-the- road use. The movement of the arms towards the bead ring segments may for instance, and as known per se, be realised by for instance pneumatic drives or comparable drives.
The tyre building drum 1 is and has furthermore been designed such that the means for axially and radially moving each set of folding arms 7 comprises a longitudinally slidable annular steering segment 1 2 that is provided with sloping steering surface 1 3 which in axial direction of a bead ring segment 3 in question slopes to the outside in the direction away from the longitudinal axis 2. Moreover each folding arm 7 is provided with a steering element 14 situated between both ends of the folding arm 7, which steering element can be made to abut the steering surface 13. Due to the use of the steering element 14, that may be designed as a cam, a roller or another form of a cam follower that is known per se, the steering element 14 provides as it were an extra rotation point for the folding arm 7. Said extra rotation point when engaged by the sloping steering surface 14 becomes an extra point of application of forces, as a result of which, depending on the size of the slope of the steering surface 14, the axial force exerted by the roller element 8 on the outer tyre components 1 1 , also called side wall, is considerably reduced as a result of which the risk of undesired imprints on the tyre components is strongly reduced and may even be completely absent. An additional advantage of said extra point of rotation, i.e. the steering element 14, is that it ensures that during the first part of folding the swivel axle 9 is able to move freely, as a result of which the roller element 8 is free to follow the contour of the outer tyre components 1 1 , which is advantageous in case of outer tyre components provided with a thickening.
The annular steering segment 12 is furthermore provided with a stop 15 (a stop surface in the embodiment shown) for an annular folding arm segment 10. The annular folding arm segment 10 is in this case situated between the annular steering segment 12 in question (its stop surface 1 5) and the bead ring segment 3 in question.
In the first position of the folding arms 7 (as shown in figure 1 ) the stop 15 of the annular steering segment 1 2 is spaced apart from the annular folding arm segment 10. The mutual distances considered in axial direction between a bead ring segment 3, the first end (8) and the steering element 14 of a folding arm 7 in question are chosen such that from the situation in which the folding arms 7 are in the first position (as shown in figure 1 ) at movement of the steering segment 12 towards the bead ring segment 3, the steering surface 13 will come to abut the steering element 14 so that the roller element 8 is moved from the first position. At further movement of the steering segment 1 2 towards the bead ring segment 3 the roller element 8 at the first end of the folding arm 7 presses the part 1 1 of the tyre components outside of the bead ring segments 3 against a bead ring core 4, 5 placed on the bead ring segment 3, while simultaneously moving the roller element 8 away from the longitudinal axis 2. Here the steering element 14 moves along the steering surface 13 until the abutment 15 of the annular steering segment 12 comes to abut the annular folding arm segment 10, after which the folding arm 7 swivels about the swivel axle 9 and the steering element 14 comes to lie apart from the steering surface 13. In figure 2 the situation is shown in which the steering element 14 just about contacts the steering surface 13. In this way the outer part 1 1 of the tyre components is pressed against the bead ring core 4, 5 by the roller element 8 from the start.
As indicated by the force arrows in figure 1 , the size of the slope of the steering surface 13 defines the size of the axial force exerted on the tyre components by the roller element 8 when the steering segment 12 moves to the bead ring segment 3. By choosing the size of the slope of the steering surface 13, the size of said axial force can therefore be adjusted to a desired axial pressure.
In the embodiment shown the roller element 8 and the steering element 13 of a folding arm 7 in the first position (shown in figure 1 ) of the folding arm 7, are situated at at least substantially the same radial distance from the longitudinal axis 2. As a result a proper, reproducible distribution of the force exerted on the tyre components by the roller element 8, is achieved. It is furthermore advantageous that in said first position of the folding arm the swivel axle 9 of the folding arm 7 is situated at a shorter radial distance from the longitudinal axis 2 than the roller element 8 and the steering element 13 are.
The above description is included to illustrate the operation of preferred embodiments of the invention and not to limit the scope of the invention. Starting from the above explanation many variations that fall within the spirit and scope of the present invention, particularly as defined in the attached claims, will be evident to an expert.
(octrooi/183832/PCTP183832A des AS/NG 3389)

Claims

Claims
1 . Method for building an unvulcanised tyre using tyre components of rubber, in which method a tyre building drum is used having a longitudinal axis and provided with two bead ring segments placed around the longitudinal axis and spaced apart from each other, wherein each bead ring segment is intended for supporting a bead ring core, with means for radially expanding a part of the tyre components placed between the ring segments, wherein the tyre building drum comprises a set of axially extending folding arms on each side outside of the bead ring segments, wherein each folding arm is provided with a first end oriented to the bead ring segment in question and provided with a roller element for directly contacting a tyre component, and wherein each folding arm at a second end facing away from the bead ring segment in question is connected via a swivel axle to a longitudinally slidable annular folding arm segment placed around the longitudinal axis, wherein the tyre building drum is furthermore provided with means for axially and radially moving each set of arms from a first position, in which the roller elements of the set of arms form an at least substantially closed ring, to a second position, for pressing a part of the tyre components placed outside of the bead ring segments against the expanded part of the tyre components placed within the bead ring segments, characterised in that the method comprises the step of designing the tyre building drum such that the means for axially and radially moving each set of folding arms comprise a longitudinally slidable annular steering segment which is provided with a sloping steering surface which in axial direction of a bead ring segment in question slopes to the outside in the direction away from the longitudinal axis, wherein each folding arm is provided with a steering element situated between both ends of the folding arm which steering element can be made to abut the steering surface, and wherein the annular steering segment is provided with a stop for an annular folding arm segment, wherein the annular folding arm segment is situated between the annular steering segment in question and the bead ring segment in question, wherein in the first position of the folding arms the stop of the annular steering segment is situated spaced apart from the annular folding arm segment, and in that the method comprises the step of choosing the mutual distances such considered in axial direction between a bead ring segment, the first end and the steering element of a folding arm in question, that from the situation in which the folding arms are in the first position when moving the steering segment towards the bead ring segment, the steering surface will come to abut the steering element so that the roller element is moveable from the first position, after which at further movement of the steering segment towards the bead ring segment the roller element at the first end of the folding arm presses the part of the tyre components outside of the bead ring segments against a bead ring core to be placed on the bead ring segment while simultaneously the roller element moves away from the longitudinal axis, wherein the steering element moves along the steering surface until the stop of the annular steering segment comes to abut the annular folding arm segment, after which the folding arm swivels about the swivel axle and the steering element comes to lie apart from the steering surface.
2. Method according to claim 1 , characterised in that the method further comprises the step of designing the tyre building drum such that the roller element and the steering element of a folding arm in the first position of the folding arm are situated at least substantially at the same radial distance from the longitudinal axis.
3. Method according to claim 2, characterised in that the method further comprises the step of designing the tyre building drum such that in the first position of the folding arm the swivel axle of the folding arm is situated at a shorter radial distance from the longitudinal axis than the roller element and the steering element are.
4. Method according to any one of the preceding claims, characterised in that the method comprises the step of choosing the size of the slope of the steering surface such that when moving the steering segment towards the bead ring segment a desired axial pressure on the tyre components is realised.
5. Tyre building drum having a longitudinal axis and provided with two bead ring segments placed around the longitudinal axis and spaced apart from each other, wherein each bead ring segment is intended for supporting a bead ring core, with means for radially expanding a part of the tyre components placed between the ring segments, wherein the tyre building drum comprises a set of axially extending folding arms on each side outside of the bead ring segments, wherein each folding arm is provided with a first end oriented to the bead ring segment in question and provided with a roller element, and wherein each folding arm at a second end facing away from the bead ring segment in question is connected via a swivel axle to a longitudinally slidable annular folding arm segment placed around the longitudinal axis, wherein the tyre building drum is furthermore provided with means for axially and radially moving each set of arms from a first position, in which the roller elements of the set of arms form an at least substantially closed ring, to a second position, for pressing a part of the tyre components placed outside of the bead ring segments against the expanded part of the tyre components placed within the bead ring segments, wherein the means for axially and radially moving each set of arms comprise a longitudinally slidable annular steering segment provided with a sloping steering surface which in axial direction of a bead ring segment in question slopes to the outside in the direction away from the longitudinal axis, wherein each folding arm is provided with a steering element situated between both ends of the folding arm which steering element can be made to abut the steering surface, and wherein the annular steering segment is provided with a stop for an annular folding arm segment, wherein the annular folding arm segment is situated between the annular steering segment in question and the bead ring segment in question, wherein in the first position of the folding arms the stop of the annular steering segment is situated spaced apart from the annular folding arm segment, wherein the mutual distances considered in axial direction between a bead ring segment, the first end and the steering element of a folding arm in question have such a size that the method according to claim 1 can be carried out.
6. Tyre building drum according to claim 5, characterised in that the roller element and the steering element of a folding arm in the first position of the folding arm are situated at least substantially at the same radial distance from the longitudinal axis.
7. Tyre building drum according to claim 6, characterised in that in the first position of the folding arm the swivel axle of the folding arm is situated at a shorter radial distance from the longitudinal axis than the roller element and the steering element are.
PCT/NL2008/050751 2007-11-26 2008-11-26 Method and tyre building drum for building a tyre WO2009070019A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AT08854000T ATE553915T1 (en) 2007-11-26 2008-11-26 METHOD FOR MAKING TIRE AND DRUM THEREOF.
CN200880117719.6A CN101873925B (en) 2007-11-26 2008-11-26 Method and tyre building drum for building a tyre
RU2010120764/05A RU2472623C2 (en) 2007-11-26 2008-11-26 Method and drum for tire assembly
JP2010534904A JP2011504428A (en) 2007-11-26 2008-11-26 Tire assembling method and tire assembling drum
KR1020107014204A KR101418917B1 (en) 2007-11-26 2008-11-26 Method and tyre building drum for building a tyre
BRPI0819760 BRPI0819760A2 (en) 2007-11-26 2008-11-26 Tire construction method and drum for tire construction
EP08854000A EP2217434B1 (en) 2007-11-26 2008-11-26 Method of building tyres and drum therefor.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US429107P 2007-11-26 2007-11-26
US61/004,291 2007-11-26
NL2001031A NL2001031C2 (en) 2007-11-26 2007-11-26 Method of manufacturing unvulcanized tire, involves moving roller element to press tire components on core placed on bead ring segment, and moving steering element until steering segment contacts folding arm segment of molding drum
NL2001031 2007-11-26

Publications (1)

Publication Number Publication Date
WO2009070019A1 true WO2009070019A1 (en) 2009-06-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2008/050751 WO2009070019A1 (en) 2007-11-26 2008-11-26 Method and tyre building drum for building a tyre

Country Status (8)

Country Link
EP (1) EP2217434B1 (en)
JP (1) JP2011504428A (en)
KR (1) KR101418917B1 (en)
CN (1) CN101873925B (en)
AT (1) ATE553915T1 (en)
BR (1) BRPI0819760A2 (en)
RU (1) RU2472623C2 (en)
WO (1) WO2009070019A1 (en)

Cited By (6)

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CN102076490A (en) * 2009-08-13 2011-05-25 Vmi荷兰公司 Tyre building drum for building an unvulcanised tyre
WO2011069699A1 (en) * 2009-12-09 2011-06-16 Continental Reifen Deutschland Gmbh Device for turning up a tyre-building part on a tyre-building drum using a roller lever
WO2012156135A1 (en) * 2011-05-18 2012-11-22 Continental Reifen Deutschland Gmbh Method for producing a vehicle tire
EP2674288A1 (en) * 2012-06-14 2013-12-18 Continental Reifen Deutschland GmbH Method for making a vehicle tyre
WO2017198975A1 (en) * 2016-05-20 2017-11-23 Compagnie Generale Des Etablissements Michelin Folding-up system for manufacturing green tyres
CN110740856A (en) * 2017-06-19 2020-01-31 株式会社普利司通 Tire forming device and tire manufacturing method

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NL2009373C2 (en) * 2012-08-28 2014-03-03 Vmi Holland Bv Device for providing a bead.
DE112014006423T5 (en) * 2014-02-28 2016-12-08 Fuji Seiko Co., Ltd. Wulsteinheit-assembly device
WO2015145356A1 (en) * 2014-03-24 2015-10-01 Marangoni Meccanica S.P.A. Tyre carcass building drum and operating method of said tyre carcass building drum

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US3887423A (en) * 1966-02-25 1975-06-03 Nrm Corp Tire building machine
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US4362592A (en) * 1981-04-09 1982-12-07 The B. F. Goodrich Company Ply turn-up means in a tire building machine
EP0808707A2 (en) * 1996-05-21 1997-11-26 Mitsubishi Heavy Industries, Ltd. Tyre building drum having a turn-up device
US20060180263A1 (en) * 2003-02-07 2006-08-17 Yutaka Takasuka Method and device for folding back tire structure member
EP1800846A1 (en) * 2004-09-28 2007-06-27 Bridgestone Corporation Tire molding apparatus with folding mechanism and method of folding in molding tire

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102076490A (en) * 2009-08-13 2011-05-25 Vmi荷兰公司 Tyre building drum for building an unvulcanised tyre
WO2011069699A1 (en) * 2009-12-09 2011-06-16 Continental Reifen Deutschland Gmbh Device for turning up a tyre-building part on a tyre-building drum using a roller lever
WO2012156135A1 (en) * 2011-05-18 2012-11-22 Continental Reifen Deutschland Gmbh Method for producing a vehicle tire
EP2674288A1 (en) * 2012-06-14 2013-12-18 Continental Reifen Deutschland GmbH Method for making a vehicle tyre
WO2017198975A1 (en) * 2016-05-20 2017-11-23 Compagnie Generale Des Etablissements Michelin Folding-up system for manufacturing green tyres
FR3051389A1 (en) * 2016-05-20 2017-11-24 Michelin & Cie RETROSSING INSTALLATION FOR THE MANUFACTURE OF PNEUMATIC BRAKE
CN110740856A (en) * 2017-06-19 2020-01-31 株式会社普利司通 Tire forming device and tire manufacturing method

Also Published As

Publication number Publication date
CN101873925A (en) 2010-10-27
CN101873925B (en) 2012-12-26
JP2011504428A (en) 2011-02-10
BRPI0819760A2 (en) 2015-05-05
EP2217434A1 (en) 2010-08-18
ATE553915T1 (en) 2012-05-15
RU2010120764A (en) 2012-01-10
KR20100108538A (en) 2010-10-07
KR101418917B1 (en) 2014-07-15
RU2472623C2 (en) 2013-01-20
EP2217434B1 (en) 2012-04-18

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