Drive belt
AssigneeVan Doorne's Transmissie B.V.
InventorsPaulus Maria Smeets, Wilhelmus Peter Catharina Peters, Johannes Hendrikus Lith
Life of this patent
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Abstract
A drive belt for use in a continuously variable transmission includes a plurality of transverse elements carried by at least one endless carrier with at least one endless band, received in a receiving shot provided for the band in the element, the slot allowing relative axial play Pa between the element and the band relative to the predominant longitudinal direction of the belt, wherein the axial play is of a value between 0.2 and 0.95 times the maximum amount of misalignment defined for the belt, indicated in maximum amount of lateral displacement.
Claims18
Drive belt (6) for use in a continuously variable transmission with a driving shaft (AP) and a driven shaft (As), each shaft being provided with a pulley (3;
- 5) having two sheaves (9, 10) with a pulley surface (21), whereby the pulley surfaces (21) of the two pulleys (3;
- 5) are mutually oriented at an angle thereby defining a V-shaped groove, said drive belt (6) comprising a plurality of transverse elements (8) carried by at least one endless
- carrier (7a, 7b) comprising at least one endless band, received in a receiving slot (18, 15, 13, 17) provided for said band in said element (8), the slot (18, 15, 13, 17) allowing relative axial play (Pa) between said element (8) and said band relative to the predominant longitudinal direction of the belt (6), characterized in that the axial play (Pa) is of a value between 0.2 and 0.95 times the maximum amount of misalignment defined for the belt (6), indicated in amount of lateral displacement (S) determined by a skewing formula:
- S := D 2 π L · ( E - 1 E + 1 ) 2 · tan ( α )
- wherein:
- D is a diameter of a curved run of the drive belt (6) when contacting the pulley surfaces (21) of the pulleys (3;
- 5) at unity transmission ratio (E=1) L is a perpendicular distance between the driving shaft A and the driven shaft As;
- E is the transmission ratio of the transmission;
- and
- α is half the angle of the V-shaped groove defined by the pulley surfaces (21).
Variator set comprising a pair of pulleys (5) and a drive belt (6) for mounting between said pulleys (5), each of the pair of pulleys (3;
- 5) having two sheaves (9, 10) with a pulley surface (21), whereby the pulley surfaces (21) of the two pulleys (3;
- 5) are mutually oriented at an angle thereby defining a V-shaped groove, said drive belt (6) comprising a plurality of transverse elements (8) carried by at least one endless carrier (7a, 7B) comprising at least one endless band, received in a receiving slot (18, 15, 13, 17) provided for said band in said element (8), the slot (18, 15, 13, 17) allowing relative axial play (Pa) between said element (8) and said band relative to the predominant longitudinal direction of the belt (6), characterized in that the axial play (Pa) is of a value between 0.2 and 0.95 times the maximum amount of misalignment defined for the belt (6), indicated in amount of lateral displacement (S) determined by a skewing formula:
- S := D 2 π L · ( E - 1 E + 1 ) 2 · tan ( α )
- wherein:
- D is a diameter of a curved run of the drive belt (6) when contacting the pulley surfaces (21) of the pulleys (3;
- 5) at unity transmission ratio (E=1) L is a perpendicular distance between the driving shaft Ap and the driven shaft As;
- E is the transmission ratio of the transmission;
- and
- α is half the angle of the V-shaped groove defined by the pulley surfaces (21).
Transmission comprising a drive belt (6), a driving shaft (Ap) and a driven shaft (As), each shaft being provided with a pulley (3;
- 5) having two sheaves (9, 10) with a pulley surface (21), whereby the pulley surfaces (21) of the two pulleys (3;
- 5) are mutually oriented at an angle thereby defining a V-shaped groove, said drive belt (6) comprising a plurality of transverse elements (8) carried by at least one endless carrier (7a, 7B) comprising at least one endless band, received in a receiving slot (18, 15, 13, 17) provided for said band in said element (8), the slot (18, 15, 13, 17) allowing relative axial play (Pa) between said element (8) and said band relative to the predominant longitudinal direction of the belt (6), characterized in that the axial play (Pa) is of a value between 0.2 and 0.95 times the maximum amount of misalignment defined for the belt (6), indicated in amount of lateral displacement (S) determined by a skewing formula:
- S := D 2 π L · ( E - 1 E + 1 ) 2 · tan ( α )
- wherein:
- D is a diameter of a curved run of the drive belt (6) when contacting the pulley surfaces (21) of the pulleys (3;
- 5) at unity transmission ratio (E=1) L is a perpendicular distance between the driving shaft Ap and the driven shaft As;
- E is the transmission ratio of the transmission;
- and
- α is half the angle of the V-shaped groove defined by the pulley surfaces (21).
Dependencies are inferred from the claim text.