EP2292844B1 - Cutter for generating a road marking and road marking - Google Patents

Description

The invention relates to a cutting body for producing a lane marking with a rotatable about a rotation axis rotary body, which can accommodate a plurality of cutting elements interchangeable, which determine a cutting curve.

From the US 6,547,484 B2 a road milling machine with a cutting body is known, which has a Fräswalzenrohr as a rotary body. The roll surface is barrel-shaped and convex in the direction of the axis of rotation. It picks up chisel holders in which chisels can be exchanged. The bits are equipped with carbide tips, which serve as cutting elements. Corresponding to the convex curvature of the roller surface, the carbide tips form a convex cutting curve in the direction of the axis of rotation of the milling roller tube. This convex cutting curve results during the rotation of the rotating body. When the rotating cutting body towards the machined Road surface is delivered, then the chisel cut a recess from the road. Corresponding to the convex curvature of the cutting curve, a concave trough is generated transversely to the longitudinal extent of the roadway. Due to the circular cross-section of the body of revolution, the recess has a concave shape even in the longitudinal direction. To produce a lane marking, a plurality of depressions are milled from one another at equal pitch into the lane. The road marking thus forms a desired geometric unevenness in the road. When rolling over with a vehicle tire, noises and vibrations occur, which are perceived by the driver and signal him, for example, leaving the road.

The lane markings thus have the function and task of delivering an acoustic and haptic warning signal. However, this noise source is sometimes disturbed by the environment adjacent to the roadway. Another disadvantage of the known road markings results when driving over a two-wheeler. The two-wheeler is laterally offset, which can then trigger dangerous steering corrections for the driver. If rainwater accumulates in the depressions, then the driving situation of the bicycle may become unstable.

In the US 3,554,606 For example, a cutting body for producing a lane marking is known. In this case, a rotary body is used which has a plurality of cutting elements. The cutting elements are formed by diamond particles which are mounted on a contoured surface of the rotating body. The rotary body forms a cutting curve with the cutting elements. The cutting curve is formed by four convex elevations and three concave transition sections. The concave transition sections go over between the convex elevations in this. This known cutting body can be set during the use of tools in rotational movement and placed on the road surface to be processed. The cutting bodies grind into the road surface. The rotational movement is superimposed by a linear movement that runs parallel to the road surface. Thus, linear depressions can be introduced into the roadway. These linear depressions serve for picking up color so that, for example, lane side markings can be generated. Due to the grinding technique used, the depressions in the road surface can only be created with a low penetration depth.

Cutting bodies are also known from the prior art with which road markings can be cut into the road surface. The US 2004/0005190 A1 shows such an arrangement. Here, interchangeable cutting teeth are mounted on a cylindrical cutting roller. The cutting teeth are positioned in a predetermined arrangement to each other. The cutting roller can be set in rotary motion. The roller rotating device is associated with a lifting device which periodically raises and lowers the cutting roller. During operation, the lifting and lowering movement is superimposed on a linear movement of the construction machine vehicle along the roadway direction. As a result, a cutting movement is generated, wherein each cutting tooth lifts a comma-shaped chip from the road surface. This results in substantially part-circular recesses in the road surface. Such recesses are unsuitable for use as Rüttelstreifen. Rüttelstreifen form voluminous geometric irregularities in the roadway. When rolling over with a vehicle tire, noises and vibrations occur, which are perceived by the driver and signal him, for example, leaving the road. The road markings according to the D2 create sharp-edged transitions between the road surface and the lane marking. These jagged transitions move a bicycle when driving sideways, which can cause the driver then dangerous steering corrections. In addition, a relatively large amount of water accumulates in the depressions, which further destabilizes the driving situation of the two-wheeled vehicle. A disadvantage has also been found that a relatively strong noise when driving over, which is sometimes perceived as disturbing in the adjoining the road environment.

From the US 2004/0166774 A1 a similar arrangement is known. In this case, a plurality of cutting tools are circumferentially fixed on a cutting wheel. The cutting wheel is lowered at periodic intervals on the road surface and produces here a milling.

It is an object of the invention to provide a cutting body with which lane markings can be produced with improved user characteristics.

This object is achieved with the features of claim 1. Accordingly, it is provided that the cutting curve forms a concave cutting region in the direction of the axis of rotation, and that in each case a concave cutting region adjoins the convex cutting region on both sides.

With the cutting body according to the invention depressions can be milled for road markings, in which the road surface is continuously transferred over the convex portion in the concave bottom. This has the advantage that the tire of a vehicle passes more gently into the depression. As a result, a reduction of the noise is achieved, but still sufficient sound level and in particular a sufficient haptic warning signal for generating attention in the driver arises.

The geometry of the lane marking also allows for a problem-free driving over a two-wheeler and that a nuisance in the driver's side is reduced. In addition, with the convex portion of the recess, the volume formed by the recess is reduced. Thus, less water can collect in it, which significantly reduces the risk of the instability of a two-wheeler on wet roads.

According to a preferred embodiment variant of the cutting body, it may be provided that at least one of the concave cutting regions terminates at the end facing away from the convex cutting region in an end region parallel to the axis of rotation. In this way, the well becomes more harmonic Transition to the road surface generated, which resists particularly robust mechanical stresses.

If it is provided that the radius of the convex cutting region is between 200 mm and 400 mm, and / or that the radius of the concave cutting region is between 400 mm and 800 mm, then corresponding geometries arise on the depression, which with reduced influence on the Tire guide cause sufficient noise.

A conceivable embodiment of the invention is such that the rotary body has a mounting surface, are mounted on the tool holder, which can receive the cutting elements replaceable, that the mounting surface has a convex cutting portion associated with the convex mounting portion and the concave cutting portion associated concave mounting portion. With such a rotary body, the cutting curve can be generated in a simple manner using the same bit holder and cutting elements.

A cutting body according to the invention can be characterized in that a fastening flange is arranged in the hollow region enclosed by the rotational body and that the fastening flange is coupled to the rotational body at the inner wall section assigned to the convex cutting region. The fastening flange is thus fixed in the strength-optimized manner in the thickened section of the rotational body formed by the convex cutting region.

Road markings in the form of depressions can be produced with the cutting bodies according to the invention, the depressions having two lateral longitudinal walls extending in the longitudinal direction of the road, which extend into a floor area, the depressions being bounded by two transverse walls running transversely to the roadway direction, a convex area being at least one the longitudinal walls is transferred to a concave area of the floor and / or wherein the convex portion of at least one of the side walls in the road surface is transferred. In this way, depressions that affect the side guide of the wheel little.

It is also conceivable that the transverse walls have a concave area, which is indirectly or directly transferred to the road surface. Then arises when hitting the wheel on the transverse wall a sufficiently high sound pressure. The recesses may be spaced from each other in the same pitch grid to form the lane marking or it is conceivable that the individual recesses adjoin one another directly.

Figur 1

einen Vertikalschnitt durch eine Fahrbahn und einen Schneidkörper,

Figur 2

einen Vertikalschnitt durch eine Fahrbahn,

Figuren 3 und 4

in schematischer Darstellung verschiedene Fahrbahn markierungen,

Figur 5a

einen Schneidkörper gemäß dem Stand der Technik in schematischer Seitenansicht,

Figuren 5b und 5c

eine Fahrbahnmarkierung, gefertigt mit einem Schneidkörper gem. Figur 5a,

Figur 6a

einen Schneidkörper gemäß dem Stand der Technik in schematischer Seitenansicht,

Figuren 6b und 6c

eine Fahrbahnmarkierung, gefertigt mit einem Schneidkörper gem. Figur 6a,

Figur 7a

den erfindungsgemäßen Schneidkörper gem. Figur 1 in schematischer Seitenansicht

Figuren 7b und 7c

eine Fahrbahnmarkierung, gefertigt mit einem Schneidkörper gem. Figur 7a,

Figur 8

die Kontur der Fahrbahnmarkierung gem. Figur 6b bzw. 6c in einem Koordinatensystem,

Figur 9

die 1. Ableitung der sich aus Figur 8 ergebenden Kurve,

Figur 10

die Kontur der Fahrbahnmarkierung gem. Figur 7b bzw. 7c in einem Koordinatensystem und

Figur 11

die 1. Ableitung der sich aus Figur 10 ergebenden Kurve.

The invention will be explained in more detail below with reference to the embodiment shown in the drawings. Show it:

FIG. 1

a vertical section through a roadway and a cutting body,

FIG. 2

a vertical section through a roadway,

FIGS. 3 and 4

in a schematic representation different road markings,

FIG. 5a

a cutting body according to the prior art in a schematic side view,

FIGS. 5b and 5c

a road marking, manufactured with a cutting body gem. FIG. 5a .

FIG. 6a

a cutting body according to the prior art in a schematic side view,

Figures 6b and 6c

a road marking, manufactured with a cutting body gem. FIG. 6a .

Figure 7a

the cutting body according to the invention. FIG. 1 in a schematic side view

FIGS. 7b and 7c

a road marking, manufactured with a cutting body gem. Figure 7a .

FIG. 8

the contour of the lane marking gem. FIG. 6b or 6c in a coordinate system,

FIG. 9

the 1st derivative of the FIG. 8 resulting curve,

FIG. 10

the contour of the lane marking gem. FIG. 7b or 7c in a coordinate system and

FIG. 11

the 1st derivative of the FIG. 10 resulting curve.

FIG. 1 shows a cutting body having a roller-shaped rotary body 10. The rotary body 10 is tubular and has a cylindrical inner receptacle which is formed by the jacket of the rotary body 10. In the inner receptacle, a mounting flange 11 is arranged with fastening receptacles 12, to which the output shaft of a drive train can be flanged.

The jacket of the rotary body 10 forms a support member 13 with a barrel-shaped circumferential mounting surface 14. The mounting surface 14 is composed of a central convex mounting portion 14.2 and two laterally adjoining thereto concave mounting portions 14.1 together. The concave fastening sections 14.1 pass directly into the convex fastening section 14.2. On the two mounting portions 14.1 and 14.2 chisel holder changing systems, consisting of a base part and a replaceable fastened thereto bit holder 20, mounted. Here are the basic parts with the Fastening sections 14.1, 14.2 welded. The base parts are offset from one another in the circumferential direction, so that clearing and loading turns result, which run helically on the fastening sections 14.1, 14.2.

Also conceivable is an embodiment of the invention, in which the bit holders 20 are welded directly onto the fastening sections 14.1, 14.2, so that base parts can be dispensed with. The chisel holder 20 have chisel recordings in which chisel 21, preferably round shank chisel, can be exchangeably received. The chisels 21 are equipped with cutting elements which define a cutting curve 15 when the rotation body 10 rotates about the axis of rotation R. The cutting curve 15 forms a kind of envelope.

As the FIG. 1 illustrates the cutting curve 15 according to the configuration of the mounting portions 14.1, 14.2 a convex cutting area 15.2 and laterally adjoining concave cutting areas 15.1. The radius R _{2 of} the convex cutting portion 15.2 is preferably between 200 mm and 400 mm, in the present case R ₂ = 300 mm. The radius R _{1 of} the concave cutting areas 15.1 is preferably between 400 mm and 800 mm. Thus, for example, the particularly preferred ratio R ₁ : R ₂ of about 2: 1 can be set.

With the cutting body, lane markings, consisting of depressions 31 arranged in a row one behind the other, can be cut into the carriageway 30.

The resulting geometry of the recess 31 is in FIG. 2 shown enlarged. As can be seen from this drawing, the depression 31 has, complementary to the cutting curve 15, a concave bottom 31.2 transversely to the roadway longitudinal direction, from which two convex longitudinal walls 31.1 rise on both sides. The longitudinal walls 31.1 merge into the roadway surface 32. The transversely extending to the roadway longitudinal extent transverse walls 31.3 are concave according to the roll circumference.

In the FIGS. 3 to 8 various design variants of road markings are shown, which are each formed of juxtaposed recesses 31. In this case, the depressions 31 are produced by cutting bodies which, in principle, conform to the construction FIG. 1 correspond.

FIG. 3 shows an embodiment variant in which the cutting body delivered perpendicular to the road surface 32 and after the cutting body has reached its lowest feed position is reset again before it is offset by the desired pitch in the roadway longitudinal direction, etc.

FIG. 4 shows one too FIG. 3 changed approach. In this case, the cutting body is not reset above the level of the road surface 32, but continuously delivered during the feed movement along the roadway longitudinal direction to the deepest delivery position and returned to the level of the road surface, so that the recesses 31 are lined up directly. In this case, the feed and reset movement can be coordinated with the feed motion in such a way that also produce an alternating arrangement of convex and concave curved portions of the recess in the roadway longitudinal direction. It can thereby be achieved that each individual depression of the series of recesses receives a similar curve in the longitudinal section, as the cross section.

FIG. 5a shows a cutting body 10 according to the prior art, which generates with its chisels 21 a cylindrical envelope. Accordingly, can be with this cutting body 10 road markings 31 milled with partially cylindrical geometry, such as FIG. 5b shows. That the FIG. 5b taken enlarged detail acc. FIG. 5c shows that results in this road markings 31 a sharp 90 ° transition between the road surface 32 and the subsequent longitudinal wall 31.1.

FIG. 6a shows a further cutting body 10 according to the prior art (for example according to the US 6,547,484 B2 ). The chisels 21 produce a convex Cutting curve. This results in this cutting body 10 road markings 31 in FIG. 6b shown form.

FIG. 6c shows one of FIG. 6b taken detail. It can be seen that the transition from the road surface 32 in the longitudinal side walls 31.1 relative to the variant according to FIGS. 5b and 5c is significantly flattened, but still forms a relatively steep transition.

Figure 7a shows for improved comparison the cutting body 10 gem. FIG. 1 ,

FIG. 7b circa FIG. 2 and FIG. 7c shows that FIG. 7b Enlarged detail with Vllc. It can be clearly seen that according to the invention an improved transition between the road surface 32 and the longitudinal wall 31.1 can be designed. This advantage is based on the FIGS. 8 to 11 further clarified. In FIG. 8 is the gem. FIG. 6b resulting contour of the lane marking 31 drawn as a curve in a coordinate system.

FIG. 10 shows analogously the curve of the pavement marking acc. FIG. 7b ,

If you now form these curves (acc. FIGS. 8 and 10 ) the first derivative, so the curves acc. FIGS. 9 and 11 , It becomes clear that a continuous transition from the roadway surface 32 into the longitudinal wall 31.1 can be realized with the road marking 31 according to the invention, and this road marking 31 follows in its gradient course a sinusoidal curve.

In contrast, illustrates the FIG. 9 the unsteady transition between the road surface 32 and the longitudinal side wall 31.1.

Claims (8)

1. Cutting body for producing a road marking, comprising a rotational body (10) which can be rotated about an axis of rotation (R) and which can interchangeably receive a plurality of cutting elements (21) which define a cutting curve (15) which forms a convex cutting region (15.2) in the direction of the axis of rotation (R), characterized in that the convex cutting region (15.2) is adjoined on both sides by a respective concave cutting region (15.1).
2. Cutting body according to Claim 1, characterized in that, at the end facing away from the convex cutting region (15.2) and relative to the axis of rotation, the cutting curve (15) has a slope which approaches zero or has there a substantially axis-parallel profile.
3. Cutting body according to Claim 1 or 2, characterized in that the cutting curve, or the individual regions of the cutting curve, follow a real function, in particular a trigonometric function.
4. Cutting body according to one of Claims 1 to 3, characterized in that the radius (R₂) of the convex cutting region (15.2) is between 200 mm and 400 mm.
5. Cutting body according to one of Claims 1 to 4, characterized in that the radius (R₁) of the concave cutting region (15.1) is between 400 mm and 800 mm.
6. Cutting body according to one of Claims 1 to 5, characterized in that the rotational body (10) has a fastening surface (14) on which there are fastened tool holders (20) which can interchangeably receive the cutting elements (21), and in that the fastening surface (14) has a convex fastening portion (14.2) assigned to the convex cutting region (15.2) and a concave fastening portion (14.1) assigned to the concave cutting region (15.1).
7. Cutting body according to one of Claims 1 to 6, characterized in that the rotational body (10) is designed in the form of a roller.
8. Cutting body according to Claim 6, characterized in that a fastening flange (11) is arranged in the hollow region enclosed by the rotational body (10) and in that the fastening flange (11) is coupled to the rotational body (10) in the inner wall portion assigned to the convex cutting region (15.2).

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