DE2810000A1 - FLEXIBLE TRANSMISSION LINK FOR GEAR AND PROCESS FOR THEIR PRODUCTION - Google Patents

Description

ROL 5

ROLTRA SpA
Milan / Italy

Flexible transmission link for gears and processes for their manufacture

Addition to P 26 37 437.8-12

The invention relates to a method for producing a flexible transmission member / in particular for gearboxes, in which this transmission member with a further gear member, limited by the mutual freedom of movement of the two transmission elements to convert a rotary movement into a linear movement interacts or vice versa, namely a process in which a metal wire with generally circular

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shaped cross-section to form a helical spring, from which at least a portion is designed so that the successive Coils lie against each other laterally, and that this part of the helical spring with a certain Provides pressure bias, according to claim 1 of patent application P 26 37 437.8-12.

The invention also relates to a flexible transmission link of the type referred to, which is essentially designed as a cylindrical spring which is helically wound from a metal wire with a generally circular cross-section, at least a portion of which consists of turns which are compressed to form a winding package that each pair of adjacent turns of this set of turns lies against one another in the unloaded state under a certain axial pressure, which is different from 0, according to claim 2 of patent application P 26 37 437.8-12.

The present additional invention is based on the task of improving the method described in the main application in such a way that that a flexible transmission member is obtained, which is particularly suitable for connection with a recirculating ball nut is suitable in a helical gear.

The object of the invention also includes the provision of a flexible manufactured according to the desired method Transmission link.

In terms of the method, the object is achieved according to the invention in that, in the context of the method, the method described at the outset Art in a further process step the outer surface of at least this part of the coil spring with a helical groove that has the same slope as the laterally abutting turns and an essentially semicircular cross-section.

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This groove serves as a helical drainage path for the balls of the screw gear.

In a preferred embodiment of the method according to the invention a first and a second half of the substantially semicircular cross-section of the helical Groove in each case on the flanks of two successive, one to the other adjacent turns formed.

According to the invention, the corresponding flexible transmission member is characterized in that at least on the outer surface a helical groove is provided in this sub-area of turns pressed against one another to form a set of turns, deoren slope corresponds to the slope of the turns, and which has a substantially semicircular cross-section, each of which has a first and a second half on the flanks of adjacent, laterally adjacent turns are trained.

In a further embodiment of the invention, the method concludes another step in which the inside of the helical spring at least in this sub-area with an im essentially cylindrical inner surface is provided by the inner cross-sectional halves of the turns of this sub-area essentially removed.

The flexible transmission link produced in this way is particularly suitable for being provided with a cylindrical core, and consists of a winding section at least in the partial area of windings which is compressed to form a winding package Ribbon profile wound into a screw and having a substantially rectangular cross-section, radially extending from its outer surface Ridge protrudes, which runs along the entire strip profile and a groove on each of its flanks facing away from one another having a curved cross-section, each of these

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Grooves together with the opposite groove the adjacent turn forms a groove of semicircular cross-section. The following are two embodiments of the Invention with reference to the accompanying drawings in more detail described. They represent:

FIG. 1 shows the partially sectioned view of a flexible transmission link according to the main application;

FIG. 2 shows the partially sectioned view of the flexible transmission member in a first according to the invention Execution;

Figure 3 is a corresponding view of an inventive Transmission link in a further embodiment.

The flexible transmission member 1 shown in FIG the main patent consists of a helically wound spring made of a metal wire of substantially circular shape Cross-section is wound into turns 2, which are pressed against one another to form a winding package that one running along its outer surface / helical Anger 3 has a constant slope.

If the flexible transmission member 1 with a (not shown) Recirculating ball nut of a screw gear is combined, the helical groove 3 can be used as an inner drainage path for the gear balls (not shown) serve.

For this purpose, however, it is more advantageous to look to the outside to provide a groove with a substantially semicircular cross-section on the facing side of the wire forming the windings 2, which can either be arranged in the middle of the turns 2, but preferably between two adjacent ones Turns is formed in which the groove 3 of the transmission member is enlarged according to the main application.

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Figure 2 shows a flexible transmission member according to the invention Execution which can be obtained from the transmission member 1 in that one on each side flank of the Groove 3 of the latter each provides a half 5 of a helical groove 6 which is a substantially semicircular Has cross section.

In Figure 3, a flexible transmission member 7 is shown, which is particularly suitable for receiving a (not shown) cylindrical core. The transmission member 7 can obtained from the transmission member 4 by essentially removing the inner cross-sectional halves of the turns 2, so that the transmission element in the end consists of a strip profile 8 wound into a cylindrical screw of essentially rectangular cross-section, the inner surface 9 of which forms a cylindrical inner surface of the flexible transmission member 7. The band has a profile on its outer surface 8 a ridge 10 extending over its entire length, which has a groove 11 of curved on each of its lateral flanks Has cross section. The opposing grooves 11 of two adjacent turns 2 form together each have a groove 12 of substantially semicircular cross-section, which has a helical drainage path for forms a plurality of gear balls (not shown).

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Claims (4)

Ü8 1QQ0G ROL 5 Dr. Joachim Rasper Patent Attorney Wiesbaden H3 '3 η Tel. 56 28 47 ROLTRA S.p.A. Milan / Italy Flexible transmission link for gears and process for their production Addendum to P 26 37 437.8-12 patent claims; 1. A method for producing a flexible transmission member, in particular for transmissions in which this transmission member with a further gear member, limited by the mutual range of motion of the two transmission members ^ cooperates to convert a rotary movement into a linear movement or vice versa, namely a method, in which a metal wire with a generally circular cross-section is wound into a helical spring, at least one of which a sub-area is designed so that the successive turns lie against one another laterally, and that this sub-area 809837/0871 area of the helical spring provided with a certain compressive bias, according to claim 1 of patent application " P 26 37 437.8-12, characterized in that the outer surface is at least this in a further process step Part of the coil spring is provided with a helical groove (6, 12) that has the same slope as the side has contiguous turns (2) and a substantially semicircular cross-section. 2. The method according to claim 1, characterized in that a first half (5, 11) and a second half (5, 11) of the im essential semicircular cross-section of the helical groove (6, 12) each on the flanks of two successive, contiguous turns (2) are formed. 3. The method according to claim 1 or 2, characterized in that the inside of the helical spring at least in this partial area in a further process step is provided with an essentially cylindrical inner surface (9) by the inner cross-sectional halves of the turns (2) of this sub-area are essentially removed. 4. Flexible transmission link, especially for gearboxes, in which this transmission link with a further gear link, limited by the mutual freedom of movement of the two Transmission elements) to convert a rotary movement into a linear movement or vice versa, which in the is formed essentially as a cylindrical spring, which is helically formed from a metal wire of generally circular Cross-section is wound, and in which at least a partial area consists of turns which are compressed to form a winding package that each pair of adjacent Windings of this winding package in the unloaded state under a certain axial pressure on each other, which of 0 is different, according to claims 2 to 7 of the patent application 809837/0878 "P 25 3/7 43" 7.S-13, dadimeh marked, / aülaJJ on the outside surface at least this'! 6 ,, 125) -yorgeseiheiQ is, äexen Sibeigmng «dear slope ■ dex ^ Windtang ((2) enitsprienifc, rm. Öie one in essence ihalb-Hareisfoxjaigen ^; Qner; SElinil: tfc 5, transmission link after 4, made; make a Yerfakren according to itosprnclh 2, which is marked: that at least the windings pressed together in a tindmngspalket | 2) on a band profile ΐ <8 ^, which is sunk into a hinge, from the essentially clear outer surface, form a radial clan of its outer surface (WI aaervarstent ^ which runs along the entire strip profile and on each of its flanks facing away from one another has a cooling it 13 with a curved cross-section; each; this outer length | 11J together with the opposite extension i1l $ of the adjacent winding {2) a hat Ji6, 12 | of semicircular cross-section. 809837/0878