EP4242378A1 - Arbre de fraisage pour une fraise à neige, en particulier une fraise arrière d'une dameuse - Google Patents

Arbre de fraisage pour une fraise à neige, en particulier une fraise arrière d'une dameuse Download PDF

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Publication number
EP4242378A1
EP4242378A1 EP23158113.3A EP23158113A EP4242378A1 EP 4242378 A1 EP4242378 A1 EP 4242378A1 EP 23158113 A EP23158113 A EP 23158113A EP 4242378 A1 EP4242378 A1 EP 4242378A1
Authority
EP
European Patent Office
Prior art keywords
milling
tooth
shaft
rotation
cutting tip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23158113.3A
Other languages
German (de)
English (en)
Inventor
Andreas Behmüller
Claudius Henger
Sven HOLZAPFEL
Daniel Hartmann
Martin Mangold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kassbohrer Gelandefahrzeug AG
Kaessbohrer Gelaendefahrzeug AG
Original Assignee
Kassbohrer Gelandefahrzeug AG
Kaessbohrer Gelaendefahrzeug AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kassbohrer Gelandefahrzeug AG, Kaessbohrer Gelaendefahrzeug AG filed Critical Kassbohrer Gelandefahrzeug AG
Publication of EP4242378A1 publication Critical patent/EP4242378A1/fr
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H4/00—Working on surfaces of snow or ice in order to make them suitable for traffic or sporting purposes, e.g. by compacting snow
    • E01H4/02—Working on surfaces of snow or ice in order to make them suitable for traffic or sporting purposes, e.g. by compacting snow for sporting purposes, e.g. preparation of ski trails; Construction of artificial surfacings for snow or ice sports ; Trails specially adapted for on-the-snow vehicles, e.g. devices adapted for ski-trails

Definitions

  • the invention relates to a cutter shaft for a snow blower, in particular a rear cutter of a snow groomer, with a plurality of cutter teeth arranged distributed over a circumference of a shaft shell of the cutter shaft, each cutter tooth being provided with two tooth humps spaced apart from one another in the direction of rotation of the cutter shaft.
  • the invention also relates to a rear cutter for a snow groomer with such a cutter shaft and a snow groomer with such a rear cutter.
  • Such a cutter shaft for a rear cutter of a snow groomer is from the DE 10 2013 204 723 A1 known.
  • the known milling shaft is rotatably mounted in a rear milling machine of the snow groomer and has a shaft casing on which a large number of milling teeth are arranged distributed over its circumference and length.
  • Each milling tooth is provided with two tooth cusps, each of which is part of a tooth head.
  • Each tooth head is supported by two support webs on the shaft surface of the milling shaft.
  • the two support webs are arranged axially offset from one another when viewed in the longitudinal direction of the milling shaft and have front flanks, each of which is provided with a cutting function.
  • the object of the invention is to create a milling shaft, a rear milling machine and a snow groomer of the type mentioned at the outset, which enable the achievement of a fine-grained processed snow surface.
  • each tooth hump is provided with a cutting tip, the two cutting tips of each milling tooth in the direction of rotation relative to an axis of rotation of the milling shaft by a circumferential angle from a range between 20 ° and 40 °, preferably by 30 ° , are arranged offset from one another, and that a front cutting tip, viewed radially, has a distance to the shaft shell that is at least 5 mm smaller than the rear cutting tip of each milling tooth.
  • the milling shaft according to the invention enables particularly fine-grained shredding of chunks of snow and ice.
  • the milling shaft according to the invention is preferably used in a rear milling machine of a snow groomer.
  • the milling work is evenly distributed between the two cutting tips of each milling tooth during operation of the milling shaft.
  • the height difference between the front and the back Cutting tip is preferably between 5 mm and 10 mm.
  • a particularly advantageous milling tooth geometry provides for a height difference of 7.5 mm.
  • the two cutting tips of each milling tooth are also spaced apart from one another in the circumferential direction, ie in the direction of rotation of the milling shaft, over a relatively large circumferential angle, which is selected from a range between 20° and 40°.
  • the circumferential angle ie the angle of rotation between two radials to the axis of rotation of the milling shaft, which each touch a front tip of the respective cutting tip, is 30°.
  • the relatively large distance in the direction of rotation between the two cutting tips of the two tooth cusps of each milling tooth enables the rear cutting tip of the rear tooth cusps to have already covered a sufficient circumferential path during rotation of the milling shaft before it comes to a snow that has already been processed by the respective front cutting tip. or hits chunks of ice.
  • the chunk of snow or ice that has already been processed by the front cutting tip is further shredded by the rear cutting tip of each milling tooth.
  • the preferred height difference between the lower front cutting tip and the higher rear cutting tip of each milling tooth of at least 5 mm is based on a usual machining depth of a milling shaft of a rear milling machine of a snow groomer of approximately 20 mm. This achieves an at least largely uniform distribution of the milling work on each front and rear cutting tip of each milling tooth.
  • the combination of the features described results in a double cutting or separating function for each cutter tooth for corresponding chunks of snow or ice.
  • the provision of cutting edges in the area of the cutting tips enables cutting and cutting functions at a greater radial distance from the shaft shell than in the previously described prior art.
  • the milling shaft therefore enables good snow surface processing at a lower processing depth than in the prior art, which has cutting edges in the area of the support webs below the tooth cusps.
  • both cutting tips each have a front cutting edge, which is inclined forward in the direction of rotation by an angle of at least 20 ° relative to a radial cutting the axis of rotation of the milling shaft.
  • both the front cutting tip and the rear cutting tip are each provided with a front cutting edge in the direction of rotation, which are each inclined forward in the direction of rotation relative to a corresponding radial. This results in a steep angle of the cutting edges in the direction of rotation, which results in a real, knife-like cutting effect for each cutting edge of each of the two cutting tips of each milling tooth.
  • the front cutting edge of the front cutting tip is inclined forward at a smaller angle relative to the radial intersecting the axis of rotation than the front cutting edge of the rear cutting tip relative to the corresponding radial.
  • a front cutting edge of the cutting tip of the rear tooth cusp is aligned steeper than the front cutting edge of the cutting tip of the front tooth cusp.
  • both cutting tips of each milling tooth are supported by a common tooth base, which is firmly connected to the shaft shell, the tooth base having a continuous support web on the shaft shell over an entire length of the milling tooth - viewed in the direction of rotation.
  • the milling teeth are preferably made of a steel alloy and welded to a surface of the shaft shell. Both the tooth base and the two tooth cusps with their cutting tips are aligned in one plane with respect to one another, so that a plate-shaped component results for the respective milling tooth, which is preferably produced by punching and then grinding the cutting edges.
  • the tooth base has at least one recess positioned radially above the support web.
  • the recess serves to reduce weight. Since this is formed radially above the continuous lower edge of the tooth base, i.e. the continuous support web, in the respective milling tooth, the stability of the connection of the milling tooth to the shaft shell is not affected by this recess.
  • the recess is preferably achieved by a suitable punching in the plate-shaped component of the milling tooth.
  • a snow groomer P according to Fig. 1 is intended for the maintenance and design of snow terrain, especially in a ski area.
  • the snow groomer P is provided at the rear with a rear equipment carrier, on which a rear tiller HF is detachably arranged and is also hydraulically connected to a working hydraulic system of the snow groomer P.
  • the rear milling machine HF is provided with at least one milling shaft 1, on the cylindrical shaft shell of which a large number of milling teeth 3 are arranged distributed in the direction of rotation and in the longitudinal direction of the milling shaft 1.
  • the milling teeth 3 are firmly connected to a surface of the shaft shell 2 of the milling shaft 1.
  • the milling teeth 3 are made of a steel alloy and are materially connected to the surface of the shaft shell 2 by welding. All milling teeth 3 are designed identically to one another as plate-shaped and one-piece bodies which are aligned parallel to one another in radial planes to an axis of rotation D of the milling shaft 1. Each milling tooth 3 has - seen in the direction of rotation R - a front tooth cusps 5 and a rear tooth cusps 6 spaced apart in the direction of rotation. Based on Fig. 3 the direction of rotation R is shown in relation to a direction of travel F of the snow groomer P, which corresponds to a towing direction of the rear tiller HF.
  • the two tooth cusps 5 and 6 are supported by a tooth base 4, which is together with the Tooth cusps 5 and 6 form a one-piece, plate-shaped body and are provided with a support web 7 towards the shaft shell 2.
  • both the front tooth cusp 5 and the rear tooth cusp 6 are each provided with a cutting tip that is curved forward in the direction of rotation R.
  • the front cutting tip of the front tooth cusp 5 is positioned at a smaller radial distance from a surface of the shaft shell 2 of the milling shaft 1 than the cutting tip of the rear tooth cusp 6.
  • Corresponding partial circle lines T 1 and T 2 which are connected to the front cutting tip and to the rear cutting tip, respectively are created, show a corresponding height difference A ( Fig. 4 ). This height difference A is 7.5 mm in the exemplary embodiment shown.
  • a snow surface S is indicated and a processing depth of each milling tooth 3 is shown with the rear milling machine HF in milling mode. It is clearly visible that the front cutting tip of the front tooth cusp 5 is already immersed in the snow surface S via the pitch circle line T1 . It can also be seen that the rear cutting tip of the rear tooth cusp 6, which is 7.5 mm deeper, causes an additional partial circle line T 2 that goes deeper into the snow surface S.
  • a front tip of the cutting tip of the front tooth cusp 5 is offset by an angle ⁇ in the direction of rotation to a front tip of the cutting tip of the rear tooth cusp 6.
  • This circumferential angle ⁇ is 30 ° in the illustrated embodiment. In other embodiments of the invention, this circumferential angle ⁇ is between 20° and 40°.
  • the circumferential angle ⁇ is illustrated by a first radial Rd 1 , which is applied to the front tip of the cutting tip of the front tooth cusp 5 and intersects the axis of rotation D of the milling shaft 1, and by a further radial Rd 2 , which also intersects the axis of rotation D and to which Front tip of the rear cutting tip of the rear tooth cusp 6 is applied.
  • both cutting tips of the front tooth cusp 5 and the rear tooth cusp 6 are curved forward in the direction of rotation. Both cutting tips each have a front cutting edge 9, 10.
  • a front cutting edge 9 of the cutting tip of the front tooth cusp 5 is aligned at an angle ⁇ to a radial Rd 3 , which is designed as an acute angle of at least 20° and a maximum of 40°.
  • the angle ⁇ is 23°.
  • the rear cutting tip of the rear tooth cusp 6 also has a front cutting edge 10, which is aligned at an acute angle ⁇ to a radial Rd 4 .
  • the front cutting edge 10 of the rear tooth cusp 6 is aligned somewhat steeper than the front one Cutting edge 9 of the front tooth cusp 5.
  • the angle ⁇ is 25° and is therefore also in the advantageous range between 20° and 40°.
  • the milling tooth 3 has a continuous lower edge in the direction of rotation over the entire length of the milling tooth 3 seen in the direction of rotation, which forms a support web 7.
  • This support web 7 rests flatly on the surface of the shaft casing 2 of the milling shaft 1 with its entire, circular arc-shaped underside and is cohesively connected to the surface of the shaft casing 2.
  • the milling tooth 3 is finally provided with a recess 8, which is positioned at a radial distance above the support web 7 and is essentially triangular in shape, approximately parallel to an outer contour of the front tooth cusp 5.
  • the recess 8 is formed as a passage in the form of a punched out and is used for Weight reduction of the milling tooth 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Milling Processes (AREA)
  • Adjustment And Processing Of Grains (AREA)
EP23158113.3A 2022-03-10 2023-02-23 Arbre de fraisage pour une fraise à neige, en particulier une fraise arrière d'une dameuse Pending EP4242378A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022202430.3A DE102022202430B4 (de) 2022-03-10 2022-03-10 Fräswelle für eine Schneefräse, insbesondere eine Heckfräse einer Pistenraupe

Publications (1)

Publication Number Publication Date
EP4242378A1 true EP4242378A1 (fr) 2023-09-13

Family

ID=85381375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23158113.3A Pending EP4242378A1 (fr) 2022-03-10 2023-02-23 Arbre de fraisage pour une fraise à neige, en particulier une fraise arrière d'une dameuse

Country Status (2)

Country Link
EP (1) EP4242378A1 (fr)
DE (1) DE102022202430B4 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5581914A (en) * 1995-11-21 1996-12-10 Lmc Operating Corp. Snow cutting tooth for rotating cutter bar of ski slope tiller
DE102013204723A1 (de) 2013-03-18 2014-09-18 Kässbohrer Geländefahrzeug AG Fräswelle für eine Heckfräse einer Pistenraupe
CN113216066A (zh) * 2021-04-21 2021-08-06 河北宣工机械发展有限责任公司 一种能够提高打雪效率的压雪车打雪齿
EP4183929A1 (fr) * 2021-11-23 2023-05-24 PRINOTH S.p.A. Dent pour fraise à neige et fraise à neige pour la réalisation de pistes de ski

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020215706A1 (de) 2020-12-11 2022-06-15 Kässbohrer Geländefahrzeug Aktiengesellschaft Fräswelle für eine Heckfräse einer Pistenraupe und Heckfräse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5581914A (en) * 1995-11-21 1996-12-10 Lmc Operating Corp. Snow cutting tooth for rotating cutter bar of ski slope tiller
DE102013204723A1 (de) 2013-03-18 2014-09-18 Kässbohrer Geländefahrzeug AG Fräswelle für eine Heckfräse einer Pistenraupe
CN113216066A (zh) * 2021-04-21 2021-08-06 河北宣工机械发展有限责任公司 一种能够提高打雪效率的压雪车打雪齿
EP4183929A1 (fr) * 2021-11-23 2023-05-24 PRINOTH S.p.A. Dent pour fraise à neige et fraise à neige pour la réalisation de pistes de ski

Also Published As

Publication number Publication date
DE102022202430A1 (de) 2023-09-14
DE102022202430B4 (de) 2024-08-22

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