TYRE BUILDING DRUM FOR BUILDING AN UNVULCANISED TYRE

• US 20100122775A1
• Filed: 05/20/2009
• Published: 05/20/2010
• Est. Priority Date: 05/22/2008
• Status: Active Grant

• Current Assignee: VMI Holland B.V (TKH Group NV)
• Original Assignee: VMI Holland B.V (TKH Group NV)
• Inventors: SLOTS, Antonie, DE GRAAF, Martin, MULDER, Gerrit
• Granted Patent: US 8,770,251 B2
• Time in Patent Office: Days
• US Class Current: 156/415
• CPC Class Codes: B29D 2030/3257 using pressing rollers
• CPC Class Codes: B29D 2030/3264 using radially expandable, contractible mechanical means, e.g. circumferentially spaced arms, spring rollers, cages
• CPC Class Codes: B29D 30/32 Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores

Abstract

Tyre building drum having a drum shaft and two drum halves arranged around the drum shaft. In the drum shaft one threaded spindle is arranged. On either side of the centre of the tyre building drum a driving nut is arranged on the spindle. Each driving nut is fixedly connected to the drum half in question via a connection part. Each drum half has a folding arm unit that is connected to the drum half in question so as to swing. The folding arm unit is movable in axial direction of the tyre building drum. Each drum half further has a bead ring core clamping unit intended for supporting and clamping a bead ring core. The bead ring core clamping unit is arranged on a cylindrical part. The cylindrical part is provided with a cylinder slot for accommodating the connection part and with a locking mechanism. The locking mechanism can be brought into engagement with the drum shaft. At engagement of the locking mechanism in the drum shaft the folding arm unit can be moved with respect to the cylindrical part in axial direction of the tyre building drum.

Claims

1. Tyre building drum (1) for building an unvulcanised tyre using rubber tyre components, wherein the tyre building drum comprises a central drum shaft (4) and two drum halves (5, 6) arranged at least almost substantially symmetrical with respect to the centre (3) of the tyre building drum (1) and around the drum shaft (4), characterised in that in the drum shaft (4) one threaded spindle (7) is arranged, wherein on either side of the centre (3) of the tyre building drum (1) the thread has an equal-sized pitch yet in opposite direction, wherein on either side of the centre (3) of the tyre building drum (1) a driving nut (8) is arranged on the spindle (7), wherein each driving nut (8) is fixedly connected to the drum half (5) in question via a connection part (8), wherein the drum shaft (4) is provided with a drum shaft slot (10) for accommodating the connection part (9), wherein both drum halves (5, 6) are movable in axial direction of the tyre building drum (1),

wherein each drum half (5, 6) comprises a folding arm unit (11) with folding arms (12), that are connected to the drum half (5) in question so as to swing, wherein the folding arm unit (11) is movable in axial direction of the tyre building drum (1), wherein each drum half (5, 6) further comprises a bead ring core clamping unit (15), intended for supporting and clamping a bead ring core (16), wherein the bead ring core clamping unit (15) is arranged on a cylindrical part (17) arranged around the drum shaft (4), wherein the cylindrical part (17) is provided with a cylinder slot (18) for accommodating the connection part (9) and with a locking mechanism (19), wherein the locking mechanism (19) can be brought into and out of engagement with the drum shaft (4), wherein at engagement of the locking mechanism (19) in the drum shaft (4) the folding arm unit (11) can be moved with respect to the cylindrical part (17) in axial direction of the tyre building drum (1).

2. Tyre building drum (1) according to claim 1, characterised in that locking mechanism (19) comprises a piston part (20) that can be pneumatically activated, which piston part (20) is provided with piston part teeth (20a), wherein the drum shaft (4) is provided with drum shaft teeth (21), wherein the piston part teeth (20a) can be brought into engagement with the drum shaft teeth (21).

3. Tyre building drum (1) according to claim 1, characterised in that the locking mechanism (19) is placed shifted in circumferential direction with respect to the cylinder slot (18).

4. Tyre building drum (1) according to claim 1, characterised in that the cylindrical part (17) comprises a piston chamber (22) in which a piston (23) can be moved, which piston (23) is fixedly connected to the folding arm unit (11).

5. Tyre building drum (1) according to claim 1, characterised in that each drum half (5, 6) comprises a unit (24) that can be pneumatically activated for radially moving the bead ring core clamping unit (15).

6. Tyre building drum (1) according to claim 1, characterised in that each drum half (5, 6) comprises a casing cover part (25) that is axially movable with respect to the cylindrical part (17), which casing cover part (25) forms an at least substantially closed casing surface for supporting rubber components and at the circumference is provided with recesses (26) for accommodating the folding arms (12) and letting them through.

7. Tyre building drum (1) according to claim 6, characterised in that the casing cover part (25) is provided with a vacuum device for retaining rubber components on the casing cover part (25).

8. Tyre building drum (1) according to claim 6, characterised in that the bead ring core clamping unit (15) comprises a shoulder part (27) for supporting a bead core (16), which shoulder part (27) is mechanically connected to the casing cover part (25) by a mechanical connection (28).

9. Tyre building drum (1) according to claim 1, characterised in that the spindle (7) is driven by a servomotor.