Chisel holder

Translation of description of equivalent WO 2006056269 A1

p0001toolholders

p0002The invention relates to a toolholder for a road milling machine or the like having a base portion which carries a retaining shoulder, said Hal¬ teansatz a chisel receiver, and wherein in the tool feed direction of the chisel holder is connected to the base part before the holding projection is a projection.

p0003Such a toolholder is known from DE 43 22 401 C2. The Mei¬ ßelhalter is provided with a plug-in projection, with which he is held replaceable in a plug receptacle of a base body. The Basis¬ a body mounted on the outer periphery of a Fräswalzenrohres. The plug-in shoulder of the chisel holder is integrally connected to a base member. The base bears on the plug-in projection side facing away from a Hal¬ teansatz. The holding lug is provided with a hole into which a shank chisel can be used in a known manner. For example, DE 37 01 905 C1 of example a possible installation situation.

p0004The retaining shoulder of the chisel holder is provided with a cylindrical portion in the circumferential, groove-like depressions formed as Verschleißmar- markings are introduced. In the field in the tool-feeding direction before the holding extension, the base part on a skirt-shaped projection which covers an area of ​​the base body, in which the plug-in receptacle is introduced for the plug-in projection. For this portion of the base body is protected. There are known in the art also toolholders, which are without a base body fastened directly be¬ on the milling roller tube.

p0005The above toolholders come on road milling machines, but also on kindred earth working machines such Bodenstabili- niser, mining equipment, etc. are used. Depending on the unit of Beschaffen¬ to prepare the substrate changes the Leistungsaufnah¬ me the machine. It turns out that layered-coverings that tend when dicing to form scholl like chips, the Werk¬ convincing oppose a high resistance. For example, do such chip forms the cutting of asphalt, where between the outer layer (usually about 4 cm thick) and the binder course ungenü¬ gender bonding exists.

p0006The object of the invention to provide a toolholder of the type mentioned, with the cutting power of a road milling machine or the like can be improved.

p0007This object is achieved in that the base part has a cher as Spanbre¬ formed connecting portion an¬ formed on the base member and extending starting from the retaining shoulder at least partially over the projection. With the chip breaker, the resulting chips, especially larger floes can be effectively cut. Thus the cutting resistance to the Mei¬ reduced opposes ßelhalter the milled material, resulting in a reduction of power consumption.

p0008In this way, an improvement in engine efficiency can be achieved.

p0009It has also shown that the connection of the retaining extension brings improved tool rigidity to the Vor¬ jump by the connecting portion. This is particularly advantageous when exposed retaining lugs and / or cracks Vor¬ positive and leads to an increase in the service life.

p0010According to a preferred configuration of the invention it is provided that extends the connection portion in the tool-feeding direction. In this way, a cutting geometry that the milled material low Eindring¬ resistance opposes.

p0011A conceivable variant of the invention may be such that the Verbindungs¬ section forms a ridge portion that the holding lug has a cantilevered over the Basis¬ part end section and that the transverse to Vorschu- bein direction extending web width is smaller than the dimension of the end portion in this direction.

p0012A further variant of the invention is characterized in that the end portion of the retaining extension has a bore designed as a pick receptacle, that the end portion of a ring around the central longitudinal axis of the having chisel receiver circumferential support surface that the bearing surface radially outward up to the dimensional constraints of a cylindrical portion of the end portion extends and that the connecting portion set back in the axial direction relative to the bearing surface of the retaining shoulder is attached.

p0013The cylindrical portion of the retaining extension forms a wear zone, as described in principle in DE 199 02 766.8-24. The disclosure of this document is made in this regard to the subject of the present document.

p0014The cylindrical bearing surface, the head of a shank chisel interposition of a wear-protection disk is supported. The wear-protection disk extends at least up to the size limitations of the support surface. Thus, a wear system is provided. During tool use, the wear protection plate rotates on the support surface and the area's zylindri¬ operates continuously. By the recessed arrangement of Ver¬ bonding portion of the retaining shoulder is stabilized, however, this system does not impair Verschlei߬.

p0015To ensure a continuous chip deflection it can be inventively provided that the connecting section on both sides has the web portion chip guide surfaces which diverge starting from the land portion toward the Ba¬ sisteil back and that the connecting portion is connected via a fillet-shaped transition portions at the holding extension. An optimization of the blade geometry of the bit holder results from the fact that the base part in the area of ​​the projection is laterally limited by two oblique surfaces which are mutually arranged arrow-shaped an¬ in the tool-feed direction and that the connecting portion and the inclined surface terminating in a front end portion of the projection. The front earthly realm forms a tapered portion of the ground allows particularly at grobspanigem Fräsunter¬ a good chip removal.

p0016The service life of the chisel holder can be optimized so that the coupling portion Verbin¬ is cured and / or that on the connecting portion mindes¬ least one hard material element is applied. The hard material element can beispielswei¬ se a carbide are used.

p0017A good chip-breaking geometry results from the fact that the Verbindungs¬ section having a tapered or rounded cutting form.

p0018The invention is illustrated below with reference to an embodiment shown in the drawings. Show it:

p0019FIG. 1 shows a chisel holder, in a perspective front view and

p0020FIG. 2 the bit holder according to FIG. 1 in side view and

p0021FIG. 3 in side view a tool combination with the in FIGS. 1 and Fig. 2 shown toolholders and ei¬ NEN base body and a mounted in the toolholder round shank bit Fig. 1 shows a toolholder with a base part 10. The base part 10 has a support part with a downwardly facing support face 11. The support member is in the feed direction in a projection 15 on. Here, the protrusion 15 at an angle to the support member.

p0022In the transition region of the support member for projection 15 a projecting downward insertion projection 12 is formed on the base part tenth With the plug-in projection 12 of the chisel holder can be inserted into a plug receptacle of a base body 50th In the female socket of the plug-in projection 12 can then be tightened.

p0023Front-centering 13 and a rear tensioning shown in Fig. 2 surface 12.1 of the plug-in projection 12 serve as support. When assembled, the chisel holder is supported with its support surface 11 onto a surface of the base body Gegen¬ 50th The projection 15 covers a shoulder 51 of the base body 50 and protects this so before the attack of wear abgetrage¬ NEN milled material. To the base part 10 of the chisel holder, a holding projection 30 is integrally formed via a connecting portion 35th The connecting portion 35 may also have a truncated cone-shaped or groove-shaped geometry. At its end remote the connection portion 35 of the retaining lug 30 runs in a cantilever cylindrical end section 34 of. In this final section 34 two concentrically around a introduced into the retaining shoulder 30 hole (chisel receiver 31) are circumferential wear marks rotates 34.1 einge¬. The scuff marks 34.1 thus form groove-shaped depressions which the cylindrical end portion 34 final bearing surface 33 are arranged behind one. As can be seen FIG. 3, a Rundschaft¬ can chisel 40 is inserted with its shank portion into the chisel receptacle 31. The round shank bit instructs the stem portion followed by a chisel head 41 which carries a chisel tip made of hard material. The chisel head 41 rests under Zwi¬ rule location of a wear-protection disk 42 on the bearing surface 33 of the ridge 30 from Halte¬.

p0024As FIG. 2 clearly shows, forms the retaining shoulder 30 between the cylindrical end portion 34 and the rounding section 35 a central connecting part 34.2. This is connected in one piece by means of a connecting portion 20 of the projection 15th

p0025The connecting portion 20 extends starting from the connecting part 34.2 in the tool-feeding direction. It comprises a flattened land portion 21, the GES 15 merges via inclined clamping surfaces 22 in the side surfaces 19 of the Vorsprun¬. The connecting portion 20 runs continuously in direction to a front end portion of the projection 15 from back.

p0026Two protrusion 15 laterally defining inclined surfaces 14 also run out in this area, so that the inclined surfaces 14 results in an arrow-shaped contour to the connecting section 20 and.

p0027The projection 15 is finished in the end region by means of a Verrundungsüberganges sixteenth The inclined surfaces 14 close over fillet transitions 17, the side surfaces 19 to. The connecting portion 20 is, for reasons of optimizing the tension on the one hand and drainage to the improved voltage other hand, with rounded transition portions 18,23 of the lug 30 Halte¬ connected.