EP0320705A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Breaker belt structure in pneumatic tires for vehicle wheels
Assignee: Pirelli and C SpA
•
Filing: 1988-12-01
•
Granted: —
•
Expires: 2008-12-01
Abstract
Abstract The invention relates to a breaker belt structure to be used in pneumatic tires, in particular in those of the radial carcass type. The structure comprises a radially outer strip of circumferentially arranged cords (61), preferably but not exclusively made of textile material, as polyamide or aromatic polyamide, and two felted layers (62), (63), situated in a radially inner position, which comprise an elastomeric or plastomeric supporting material and a reinforcing filler of aramide pulp oriented along a preferred direction which is inclined with respect to the circumferential direction, the preferred directions of orientation in the two felted layers being preferably inclined symmetrically to each other at an angle of 45° with respect to said circumferential direction.
Inventors
- 👤 Ornella Polvara
- 👤 Alessandro Volpi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 01:07
CPC Classifications
B; B60; B60C; B60C9/00; B60C9/18; B60C9/1821; B60C9/20; B60C9/22; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10765; Y10T152/10792
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A pneumatic tire for vehicle wheels which comprises a radial carcass (1), a tread band (5) provided with a raised pattern on its surface coming into contact with the ground and situated on the carcass top, sidewalls (2) and beads (3) for the anchorage of the tire on a corresponding assembling rim, and a breaker belt structure (6) sandwiched between the tread band and the carcass, the tire being characterized in that said breaker belt structure comprises at least one strip of rubberized fabric reinforced with longitudinal cords (61) and at least two layers (62),(63) of elastomeric or plastomeric material filled with aramide pulp, oriented in each layer along a preferred direction, with respect to the tire mid-circumferential plane, which has an opposite sense with respect to that of the other layer.
Claim 2
Dependent Claim
132 words
A pneumatic tire for vehicle wheels which comprises a radial carcass (1), a tread band (5) provided with a raised pattern on its surface coming into contact with the ground and situated on the carcass top, sidewalls (2) and beads (3) for the anchorage of the tire on a corresponding assembling rim, and a breaker belt structure (6) sandwiched between the tread band and the carcass, the tire being characterized in that said breaker belt structure comprises at least one strip of rubberized fabric reinforced with longitudinal cords (61) and at least two layers (62),(63) of elastomeric or plastomeric material filled with aramide pulp, oriented in each layer along a preferred direction, with respect to the tire mid-circumferential plane, which has an opposite sense with respect to that of the other layer.
Claim 3
Dependent Claim
33 words
A pneumatic tire as in CLAIM 1, characterized in that said structure comprises two felted layers (62),-(63) arranged radially at the same side with respect to said strip of cords at 0` .
Claim 4
Dependent Claim
34 words
A pneumatic tire as in CLAIM 1, characterized in that said breaker belt structure comprises two felted layers (62),(63) respectively arranged at opposite sides with respect to said strip of cords at 0` .
Claim 5
Dependent Claim
33 words
A pneumatic tire as in CLAIM 1, characterized in that said strips (64),(65) of rubberized fabric reinforced with longitudinally arranged cords are at least two, each embedded into one of said felted layers.
Claim 6
Dependent Claim
32 words
A pneumatic tire as in CLAIM 1, characterized in that the preferred orientation of the aramide pulp in the layers ranges between 20 and 70 with resepct to the tire mid-circumferential direction.
Claim 7
Dependent Claim
25 words
A pneumatic tire as in CLAIM 4, characterized in that said preferred orientation is symmetrical in the two layers with respect to said circumferential direction.
Claim 8
Dependent Claim
31 words
A pneumatic tire as in CLAIM 1, characterized in that the value of concentration of the aramide pulp in said layers ranges between 1 and 20 parts on 100 rubber parts.
Claim 9
Dependent Claim
23 words
A pneumatic tire as in CLAIM 1, characterized in that said breaker belt structure comprises felted layers (62), (63), (65) of different thickness.
Claim 10
Dependent Claim
41 words
A pneumatic tire as in CLAIM 1, characterized in that the elastomeric or plastomeric material supporting said felted layers has a dynamic modulus not lower than 8 Mpa and, at the same time, a tan delta value not higher than 0.5.
Claim 11
Dependent Claim
21 words
A pneumatic tire as in CLAIM 1, characterized in that the reinforcing cords in said strip are made of aromatic polyamide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.