CZ248499A3 - Double-sided, transmission belt and pulley for engagement with such belt - Google Patents

Abstract

A belt of a plurality of longitudinally extending transverse directions with alternating ribs (14,20) and grooves (16,22), with ribs (14,20) have the same pitch on both sides of the belt. Grooves (16,22) on opposite sides of the belt are mutually opposite in the transverse direction by half the pitch.

Description

Technical field

The present invention relates to double-sided, multi-ribbed drive belts and pulleys for cooperating with these belts.

BACKGROUND OF THE INVENTION

Double-sided, multi-ribbed drive belts are already well known. For example, US Patent Nos. 4,773,895 and 5,507,699 disclose such belts. These belts have ribs on each side of the pulling element that either have the same pitch with grooves on opposite sides aligned across the pulling element or have an uneven pitch. Particularly in the case of ribs with 15 equal pitches and with aligned grooves, there may be an increased tendency for the grooves to split from front to back.

The essence of the invention,

According to the present invention, a two-sided, multi-ribbed drive belt is provided having a primary side with a plurality of longitudinally extending transversely spaced alternating ribs and grooves, the ribs having a distance between their center points with a pitch P; a secondary side 25 with a plurality of longitudinally extending, alternating inner ribs and grooves spaced laterally, the inner ribs having a distance between their center points with a pitch P equal to the rib pitch P on the primary side; a layer of longitudinally extending tension members between the primary side and the secondary side; with the grooves on the secondary side of the secondary side.

9 are transversely displaced across the layer of pull members relative to the grooves on the primary side by a distance P / 2. According to the invention there is also provided a pulley having an outer circumferential ribbed surface with a plurality of circumferentially mounted and axially alternating inner protrusions and flat surfaces and a pair of outer surfaces, wherein the distance between the tips of the inner protrusions is equal to the P pitch. In another embodiment of the pulley, the distance between the outermost outer projections and the outer surface is P / 2. According to the invention, a combination of a pulley and a belt formed according to the present invention is also provided.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a perspective view of a primary side of one embodiment of a belt according to the present invention;

Giant. 2 is a cross-sectional view of the belt taken along line 2-2 of FIG. 1;

Giant. 3 is a perspective view of a secondary side of another embodiment of a belt according to the present invention;

Giant. 4 is a longitudinal sectional view of the belt taken along line 4-4 of FIG. 3;

Giant. 5 is a half-sectional view of a pulley according to the present invention;

Giant. 6 is a cross-sectional view of a third embodiment of a belt according to the present invention.

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EXAMPLES OF EMBODIMENTS OF THE INVENTION

Giant. 1 shows a two-sided, multi-ribbed drive belt, generally designated as belt 10. The belt 10 has a primary side 12 and a secondary side 18. The primary side 12 has a plurality of longitudinally extending, alternating ribs 14 and grooves 16 longitudinally spaced, the ribs 14 having a distance between their center points with a P pitch. longitudinally extending, alternating internal ribs 20 and grooves 22 spaced apart laterally. The inner ribs 20 of the secondary side 18 have a distance between their center points with a P pitch. The belt 10 has a layer of longitudinally extending pulling elements 24 located between the primary side 12 and the secondary side 18. The grooves 22 on the secondary side 18 are displaced laterally over the pulling element 24 relative to the grooves 16 on the primary side 12 by a distance P / 2.

The belt 10 further has a pair of outer ribs 21 on the secondary side 18. Depending on the number of inner ribs 20 on the secondary side 18, the outer ribs 21 have a width W equal to 1.5.P or P / 2. The belt 10 may further comprise a transverse reinforcement layer 26 which may be positioned either between the primary side 12 and the pulling member 24 or between the pulling member 24 and the secondary side 18. It is also contemplated that this transverse reinforcing layer 26 could be positioned on on both sides of the pulling member 2.4, although this embodiment is not shown.

A preferred embodiment is a belt in which transverse grooves 28 are provided on the primary side 12, which are oriented in a manner other than perpendicular to the longitudinal side.

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The direction of the belt 10 so that any transverse grooves 28 immediately adjacent the longitudinal ribs 14 are offset from each other in the longitudinal direction by a distance of 10% to 50% of the distance between grooves in the longitudinal direction. It is also contemplated that the transverse grooves 28 could be located on the secondary side 18. FIG. 3 and 4 illustrate an embodiment of a belt without transverse grooves 28.

Of course, the depths of the grooves 16 on the primary side 12 and the grooves 22 on the secondary side 18 may be the same or different. In addition, the distances from the pulling member 24 to the grooves 16 on the primary side 12 and to the grooves 22 on the secondary side 18 may be the same or different.

In one preferred embodiment of the invention, the grooves 22 on the secondary side 18 are shallower in depth than the grooves 16 on the primary side 12 and the pulling member 24 is displaced towards the grooves 22 on the secondary side 18. This allows the use of smaller pulleys on the primary side 12 of the belt 10 without switching the secondary side 18, which helps to maximize the life of the belt 10. Of course, the opposite approach can be used, if desired, to use smaller pulleys on the secondary side 18.

A better understanding of the meaning of the transverse grooves 28 may be found in US Patent No. 5,382,198, the disclosure of which is incorporated herein by reference.

Giant. 5 illustrates a pulley 29 of the present invention that is complementary to the secondary side of the belt and has an outer circumferential ribbed surface with a plurality of circumferentially mounted and axially alternating inner protrusions 30; and

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44 flat surfaces 32 and a pair of outer surfaces 34. The distance between the tips of the inner lugs 30 is the same as the pitch P and the distance between the outer inner lugs 30 and the outer surfaces 34 is 1.5P for engaging the ribs and grooves for the belt embodiment illustrated in Figures 1 to 4. As illustrated in FIG. 6, the pulley would have additional inner protrusions 36 (shown in broken lines) and a smaller flat surface 38 between the outer protrusion 36 and the outer surface 34.

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Pulleys for the primary belt side are pulleys of the type commonly used with existing multi-ribbed belts as specified by SAE (Society of Automotive Engineers).

The belt of the present invention is illustrated in 15 drawings as elastomeric. Elastomers can be used by any of those known to be suitable for use in such belts, such as polychloroprene, polyurethane, NBR, IRR, IR, SBR, CSM, EPDM, other thermosets, thermoplastic elastomers, and other polymeric compounds. .

The tensile element layer 24 of this belt can be made of any suitable material and using any suitable technique known in the art. Preferably, the tensile element layer 24 is made of spirally wound, load-bearing cords having individual threads arranged in a substantially equidistant relationship across the belt body. These cords can be made of fiberglass, carbon fiber, steel, polyester, high tenacity man-made silk or polyaramide.

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The belt of the present invention need not be used with the secondary side pulley of the invention, this belt can also be used where the secondary side of the belt is in contact with the flat pulley.

While certain representative embodiments and details have been described and illustrated herein for purposes of illustration of the present invention, it should be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described without departing from the spirit or scope of the invention.

Represented by:

Claims (12)

PATENT CLAIMS A two-sided, multi-ribbed drive belt (10) having a primary side (12) with a plurality of longitudinally extending transversely extending alternating ribs (14) and grooves (16), said ribs (14) having a distance between their central points with P pitch; a secondary side (18) with a plurality of longitudinally extending, alternating internal ribs (20) and grooves (22) extending laterally, said internal ribs (20) having a distance between their center points with a pitch P equal to the pitch P of the ribs (14) ) on the primary side (12); a layer of longitudinally extending tension members (24) between the primary side (12) and the secondary side (18), characterized in that the grooves (22) on the secondary side (18) are transversely displaced over the layer of tension members (24) relative to grooves (16) on the primary side (12) by a distance P / 2. The belt (10) of claim 1, further comprising a pair of outer ribs (21) on the secondary side. Belt (10) according to claim 2, characterized in that the outer ribs (21) have a width (W) equal to 1,5.P. Belt (10) according to claim 2, characterized in that the external ribs (21) have a width (W) equal to 0,5.P. The belt (10) of claim 1, further comprising a transverse reinforcement layer (26) between the tension members (24) and the ribs (14) on the primary side (12). * 4 ♦ 44 · · ♦ ♦ 44 44 44 4 444 4 449 444 4 4 4 4 4 4 4994 94 44 44 44 44 The belt (10) of claim 1, further comprising a transverse reinforcement layer (26) between the tension members (24) and the ribs (20) on the secondary side (18). The belt (10) of claim 1, further comprising transverse grooves (28) on the secondary side (18) that are oriented other than perpendicular to the longitudinal direction of the belt (10) such that any transverse grooves (28) are provided. 28) immediately adjacent the longitudinal ribs (20) are offset from each other in the longitudinal direction by a distance of 10% to 50% of the distance between the grooves (28) in the longitudinal direction. The belt (10) of claim 1, further comprising transverse grooves (28) on the primary side (12) that are oriented other than perpendicular to the longitudinal direction of the belt (10) such that any transverse grooves (28) are oriented. 28) immediately adjacent to the longitudinal ribs (14) are offset from each other in the longitudinal direction by a distance of 10% to 50% of the distance between the grooves (28) in the longitudinal direction. A pulley (29) for cooperating with a double-sided, multi-ribbed drive belt (10) as defined in claims 1 to 8, having an outer circumferential ribbed surface with a plurality of circumferentially mounted and axially alternating inner protrusions (30) and flat surfaces (32); a pair of outer surfaces (34), the distance between the tips of the inner protrusions (30) being the same as the pitch P, characterized in that the distance between the outer inner protrusions (30) and the outer surfaces (34) is 1.5 P. A pulley (29) for cooperating with a double-sided, multi-ribbed drive belt (10) as defined in claims 1 to 44 44 4 4 4 4 · 4 (• 4 4 1 4445 «4 · 4 44 4 444 4 4 4 • 4 4 4 4 4 4 4 4 « 8 having an outer circumferential ribbed surface with a plurality of circumferentially mounted and axially alternating inner protrusions (30) and flat surfaces (32) and a pair of outer surfaces (34), wherein the distance between the tips of the inner protrusions (30) is the same as P characterized in that the distance between the outermost inner protrusions (30) and the outer surfaces (34) is P / 2. A combination of a two-sided, multi-ribbed drive belt (10) and a pulley (29) on the secondary side to cooperate with the belt (10), wherein the belt (10) has a primary side (12), secondary side (18) and supported tension members (24); wherein the primary side (12) has a plurality of longitudinally extending, transversely spaced alternating ribs (14) and grooves (16), the ribs (14) having a width between the grooves (16) equal to the pitch P; wherein the secondary side (18) has a plurality of longitudinally extending, transversely spaced, alternating internal ribs (20) and grooves (22), said internal ribs (20) having a width between their center points equal to a pitch P that is the same as rib spacing P (14) on the primary side (12); and a pair of outer ribs (21); the pulley (29) on the secondary side having an outer circumferential ribbed surface comprising a plurality of circumferentially mounted and axially alternating inner protrusions (30) and flat surfaces (32), and wherein the distance between the tips of the inner protrusions (30) is equal to the pitch P, characterized in that the pairs of outer ribs (21) on the secondary side (18) of the belt (10) have a width of 1.5.P; »· ♦ ♦ · · ·« «« «« «« «« «« «« «« · · · · The grooves (22) on the secondary side (18) are also transversely displaced across the layer of tension elements (24) relative to the grooves (16). on the primary side (12) by a distance P / 2; and the pulley (29) on the secondary side has a pair of outer 5 surfaces (34) and a distance between the extreme inner protrusions (30) and these outer surfaces (34) is 1.5.P. A combination of a two-sided, multi-ribbed drive belt (10) and a pulley (29) on the secondary side to cooperate with the belt (10), wherein the belt (10) has a primary side (12), secondary side (18) and supported tension members (24); wherein the primary side (12) has a plurality of longitudinally extending, transversely spaced, alternating ribs (14) and grooves (16), the ribs (14) having a width 15 between the grooves (16) equal to the pitch P; wherein the secondary side (18) has a plurality of longitudinally extending, transversely spaced, alternating inner ribs (20) and grooves (22) and a pair of outer ribs (21), the inner ribs (20) having a width between their center points equal to a pitch P which is the same as the spacing P of the ribs (14) on the primary side (12) and wherein the outer ribs (21) have widths P / 2; the pulley (29) on the secondary side having an outer circumferential ribbed surface comprising a plurality of circumferentially mounted and axially alternating inner protrusions (30) and flat surfaces (32), and wherein the distance between the tips of the inner protrusions (30) is equal to the P pitch; characterized in that the grooves (22) on the secondary side (18) are displaced in the transverse direction over the layer of tension elements (24) with respect to • 99 «9 9 99 99 99 99 9 99 9 9 99 9 9 99 9 9 · 9 «9 9 9999 999 9 9 9 9 9 9 9999 99 99 99 99 99 grooves (16) on the primary side (12) by a distance P / 2; and the pulley (29) on the secondary side has a pair of outer surfaces (34) and the distance between the extreme inner projections (30) and these outer surfaces (34) is P / 2.