rOOOnARRANGEMEN^T OF A PIN IN A BORE AND PROCESS FOR POSITIONING AND SECURING THE PIN IN THE BORE
[0002]
[0003]
[0004] The invention concerns an arrangement of a pin in a bore according to the
preamble of patent clainji 1 as well as a process for positioning and securing the
pin according to the preamble of patent claim 8.
[0005]
[0006] Introducing pins, in particular planetary gear pins or rivet pins (for
maintaining a spacing) irito the bore of guide disks, and fixing these In place with the disks is known iji connection with planetary carriers of planetary transmissions, Planetar^ pins have longitudinal and transverse bore, via which the bearing points of th^ planetary gears are supplied with oil. The planetary pins must therefore bei aligned in their angular position with regard to the direction of rotation of the planetary carrier before they are fixed in place. Corrugations are therefore provided in the bore of the planetary carrier, Into which the material of thejplanetary pin can be fixed as protection against torsion. A disadvantage of this is( that the Inclination and offset of the bore axis may be changed in this way. ^he alignment of the pins takes place with a known method by means of an iassembly device which engages in the central oil bore and aligns the planetarjy pin. This method is only possible with large pin diameters, but not with Small bore diameters,
[0007] EP 1 214 536 81 jdiscloses a planetary carrier consisting of two parallel
arranged guide disks and spacers, which connect these by way of a rivet pin. The rivet pins have jourrjials at their front faces which are inserted Into bore of the guide disks and are finally secured. The material of the journal is pressed thereby radially outwardly and over the edge of the bore. The rivet pin is seated thereafter firmly within the bore and Is fixed in an axial as well as a tangential direction. Planetary pin^ having oil bores—such as those mentioned above—

are fixed in place in a sinjiilar way with the guide dislcs. It is disadvantageous in this connection that the ijnaterial of the planetary pins is relatively hard and can therefore only be fixed iri place with a corresponding use of force.
[0008]
[0009] It is an object of ttjie Invention to create a possibility for aligning the pin in
the bore and a simplified!, less expensive means of preventing torsion of the pin with respect to the disk In an arrangement of the initially mentioned type. It is also an object of the invention to make available a process for positioning and securing the pin againstitorsion.
[0010] This object is atjtained by means of the features of patent claim 1.
Advantageous embodirrjents are disclosed in the dependent claims.
[0011] According to th^ invention, the pin is provided with at least one
indentation, preferably 4 groove, on its front face. The groove runs preferably in the direction of a dianjieter through the center point of the front face, that is, diametrically. The mate|rial of the disk, that is, the bore edge, is fixed in place into the outer, diametridally opposite regions of the groove, so that a positive locking between the piiji and the disk, that is, a securing against torsion, is produced. The groove according to the invention allows also bringing the pin into a desired angular pcisition by means of rotation with the aid of a suitable tool before fixing it in place, \Vhich is also possible with the tiniest diameters. The pin
i
can thus be twisted likel a screw with slotted head by means of a screwdriver. After being fixed in placg, which is carried out by means of a suitable stamp to be advanced in axial dirjection, there is no further need for deburring, since the front face of the pin enijls flush with the outer surface of the disk, or is slightly recessed with respect to the outer surface of the disk. Producing the groove into the front face of the pir^ is accomplished with only little expense. The groove located in the front fac$ according to the invention fulfills thus two functions, namely, on the one hajid, the possibility of the positioning, and on the other hand, the possibility of| the protection against torsion by fixing. Instead of a groove arranged diamejrlcally, two grooves arranged at right angles, or several grooves arranged, fore)j:ample, in starshape, for example, can also be provided.

Providing these recesse^ or shapes on the front face of the pin is also possible and included within the jscope of the invention, which in turn makes possible engaging a tool therein Ifor the purpose of twisting it, and, on the other hand, pressing the material of the adjacent bore edge therein when being fixed in place.
[0012] The invention is ()articularly advantageous for planetary pins having oil
bores in the form of lorjgitudinal and transversal bores, since these must be aligned with respect to the planetary carrier or its guide disks before being fixed in their angular positioih. It is advantageous when fixing the pins that the relatively soft material of the planetary earner or the guide disk is pressed into the front-face groove ofjthe planetary bolt. The relatively hard material of the planetary pin is not fixed. The pin can thus be hardened throughout.
[0013] The object of thei invention is also achieved by means of a process with
the features of patent cl^im 8, wherein a pin with front-face groove Is aligned in the bores after being inserted into the bore or the planetary carrier, and is then fixed in place, which is parried out by axially directing a stamp. Fixing the pin requires less use of for4e due to the relatively soft material; lower deformation forces, which have a leaser effect on a transversal position or limitation of the planetary bolt axes, arei achieved in this way. Fixing the pin in place does not cause burr to be formec^, which would then have to be eliminated.
[001^]
[0015] An embodjiment of the invention is represented in the drawing and
will be described in morje detail below, wherein:
[0016] Fig. 1 shows a crfoss section of a pin in a bore;
[0017] Fig. 2a shows a partial section through the pin according to Fig, 1;
[0018] Fig. 2b shows a partial section of the pin; and
[0019] Fig. 2c shows a j^lan view, that is, the front face of the bolt.
[0020]
[0021] Fig. 1 shows a partially represented planetary pin 1, which is arranged in
a bore 2 of a likewise ^Dnly partially represented guide disk 3 of a planetary

carrier, which is not represented. The planetary pin 1 has a longitudinal axis 1a and a front face 1 b, whicjh is approximately flush with the outer surface 3a of the guide disk 3 before fin^l assembly. A longitudinal bore 4 is coaxial with the longitudinal axis 1a and a transverse bore 5 for supplying oil to bearing points of the planetary gears, ^vhich are not shown, are arranged in the planetary pin 1. A groove 6, whicli is penetrated by the longitudinal bore 4 and runs transversely to the longjitudinal axis la, is incorporated into the front face 1b. The arrangement represented to the left of the longitudinal axis 1 a in the drawing shows the planetary pini 1 in its initial position; the arrangement represented to the right of the longitudirial axis 1 a in the drawing shows the planetary pin 1 after being fixed in place by means of a fixing tool configured as a stamp 7. The stamp 7 has a front face 7a configured approximately in the shape of a truncated cone, and is fed in direction of the longitudinal axis la, that is, it presses, on the one hand, against an edjge region 3b of the guide disk 3 that surrounds the bore 2 and, on the other hancjj, on the front face 1b, which is repositioned by means of the feeding motion of the stamp 7, 7a. The material of the guide disk 3 is pushed at the same tim^ out of the edge region 3b into the front-face groove 6, as shown in the drawing. In this way a positive locking connection is produced between the planetary pin 1 and the guide disk 3, so that the planetary pin 1 is secured against torsion I and is also fixed in axial direction. The pin 1 can be adjusted around the longitudinal axis 1a before being fixed in place by means of a tool, which is not depicted and which engages in the longitudinal groove 6 from the front face, that ib, which can be brought into a desired angular position. The previously describeiJ fixing follows.
[0022] Figs. 2a, 2b and l2c show the planetary pin 1 according to Fig. 1 as a
single part, but only partiblly, in longitudinal section (Fig. 2a), elevated view (Fig. 2b), and plan view (Fig. 2c). The same reference numerals are utilized for parts identical to those seen in Fig. 1. Fig. 2b shows the profile of the longitudinal groove 6, which has an approximately U-shaped configuration. Fig. 2c shows the diametrical arrangen|ent of the front-face groove 6, that is, it runs in direction of a diameter and is thu^ penetrated by the longitudinal bore 4. Figs. 2b and 2c

[0023]

show a bevel 8 on the f^ont face of the planetary pin 1, by means of which the assembly is facilitated, i
The invention isineither limited to the planetary pin nor to the above-represented embodiment, but rather deviations or other embodiments are conceivable, which fulfill the functions according to the invention that reside, on the one hand, in an atjJjustability of the pin and, on the other hand, in the subsequent protection against torsion. It Is particularly important In this connection that the material of the disk or bore edge to be fixed In place, that Is, plastically deformed, and not the material of the planetary bolt, as is the case in the state of the art. the material of the disk is as a rule softer in these arrangements, while the pin, in particular the planetary pin, Is made in general of harder material or is tjiardened after it is manufactured. It is also possible to conceive alternative recfesses or shapes over the periphery or the front face of the pin, in which the material of the bore edge can flow inward from outside when being fixed in placp.

Reference Characters
1 Planetary pin
1a Longitudinal axis
1b Front face
2 Bore
3 Guide washer
3a Outer side
3b Edge region
4 Longitudinal bore
5 Transversal bore
6 Front-face groove
7 Stamp
7a Front region
8 Bevel

Patent Claims
1. An arrangement of a pin (1) in a bore (2) of a disl<: (3), in particular a planetary pin (1) in a guifie disk (3) of a planetary carrier, wherein the pin (1) is secured against torsion jjy being fixed in place with the disk (3), characterized in that the pin (1) has at ibast one recess (6) in its front face, into which material (3b) of the disk (3) can be fixed.
2. The arrangement of claim 1, characterized in that the at least one recess (6) is configured ^s a groove.
3. The arrangement of claim 2, characterized in that the groove (6) runs diametrically on the front face of the pin (1},
4. The arrangement of claim 2 or 3, characterized in that the groove (6) has an approximately U-lshaped cross section.
5. The arrangement of one of the claims 1 to 4, characterized in that the pin (1) has a longitudinal bore (4) and at least one transversal bore (5), which extends through the longitudinal bore (4).
6. The arrangement of claim 5, characterized in that the longitudinal bore (4) passes through the frbnt-face groove (6).
7. The arrangemeint of one of the claims 1 to 6, characterized in that the front face (1 b) of the pin (|l) ends flush with the outer surface (3a) of the disk (3).
8. A process for pbsitioning and securing a pin (1) in a bore (2) against torsion with an arrangement according to one of the claims 1 to 6, characterized in that

the pin (1) is introduced into the bore (2),
aligned with reference to its position by engaging a tool in the front-face
recess (6), and/oi^
fixed in its positloh by fixing the edge region (3b) of the bore (2).