EP2021548A1

EP2021548A1 - Corrugated clearing bar

Info

Publication number: EP2021548A1
Application number: EP07724959A
Authority: EP
Inventors: Jürgen Thomas
Original assignee: Gummi Kueper GmbH and Co KG
Current assignee: Kueper GmbH and Co KG
Priority date: 2006-05-11
Filing date: 2007-05-08
Publication date: 2009-02-11
Anticipated expiration: 2027-05-08
Also published as: ES2421178T3; PL2021548T3; ES2421178T9; DE102006021910A1; CA2660809C; EP2021548B9; AT11589U3; US7905035B2; EP2021548B1; AT11589U2; WO2007131663A1; CA2660809A1; US20090320332A1

Abstract

The present invention lies in the field of clearing bars (3) for the clearing blade (1) of a snow plough, which clearing bars are defined at least partially in cross section by a curved contour (10). They are based on the object of avoiding undesirable swirling of snow within the clearing blade (1). The invention is based on the finding that the snow is swirled on parts (7) of the fastening means (5) for fastening the clearing bar (3) to the clearing blade (1). To solve this problem, a design of the contour (10) that is optimized dynamically in terms of flow is described.

Description

Corrugated scraper

The present invention relates to a clearing blade for the snow blade of a snow plow, which is provided at its end facing away from the clearing road with a substantially planar attachment neck, which is intended to be grasped by fasteners and fixed to the plow blade, wherein at least parts of Fasteners rise in the direction of travel out of the plane of the attachment neck and wherein the cross section of the scraper is bounded at least in the region of the fastening means of a curved contour passing through an off-plane vertex between road and attachment neck.

Such a scraper from the utility model DE 81 29 044 U1 and the patent DE 44 04 969 B4 of the same Applicant is known.

The scraper is a wearing part, which is attached to the road-side end of the plow blade of a snow plow. The scraper is pressed onto the asphalt, scrapes the snow off the road and directs it into the plow blade, which pushes the collected snow to the side.

A conventional scraper blade according to the prior art is shown in FIG. 1. The curved clearing blade 1 of a snowplow is guided in the direction of travel F along the road 2. At the street-side, lower end of the plow blade 1, a scraper blade 3 is mounted, with which the plow blade 1 presses against the road 2. At its upper end, the scraper bar 3 has a substantially planar attachment neck 4, with which the scraper blade 3 on the plow blade 1 is attached. The attachment takes place with the aid of fastening means 5, which grip the scraper in the region of the fastening neck 4 and fix it on the plow blade 1. The fastening means 5 are usually screws (as shown in Figure 1 and DE 81 29 044 U1) or clamping claws, which grip the scraper over a large area and press against the lower end of the plow blade 1. Klemmpratzen shows the DE 30 38 121 A1. In addition, special fasteners are known, for example from DE 101 47 393 A1 of the same Applicant.

When advancing in the direction of travel F, the scraper blade 3 releases snow 6 lying on the road 2 and guides it upwards in the direction of the curved plow blade 1. Particularly in the case of fast clearance rides on highways, which are carried out at over 40 km / h, it occurs not inconsiderable snow turbulences in the ploughshare, whose foothills reach the windshield of the clearing vehicle and can clog them with snow. The driver's view is considerably limited. In the patent literature, some publications are known, which deal with the keeping away of the resulting in the plow blade snow vortex from the windshield. As an example, US 5,309,653 and DE 299 01 383 U1 are mentioned here.

Both documents describe a large expenditure on equipment to curb the effects of snow whirling caused in the ploughshare. They do not recognize and treat the root cause of the problem. This can be seen in the parts of the fastener that stand out from the plane of the attachment neck out. These parts - in Figure 1, the screw head 7 - represent a flow resistance on the otherwise planning scraper 3. The recorded snow 6 is swirled immediately below the screw head 7 in a swirling zone 8, so that sets in the plow blade 1 a highly turbulent snow flow, their foothills enforce the windshield, if no suitable interception devices are provided here.

Even if in particular screw heads occupy only a small proportion of the total width of a scraper, investigations by the applicant show that even these small flow resistances on the Transition between scraper and plow blade exert significant negative impact on the snow flow within the plow blade. When using the Klemmpratzen this problem occurs even more unpleasant. The said applies not only to Räumleisten with a completely flat front, as in the example shown in Figure 1, but also for Räumleisten with a curved contour on the cross section, as known from DE 81 29 044 U1 or DE 44 04 969 B4 are. As long as the contour is curved in the manner disclosed therein, the snow flow is also conducted past the fastening means, which is why turbulences also occur here.

From the German utility model DE 1 959 940 U1 a dozer blade with a scraper of a resilient material is known. The scraper has out of use a flat, cuboid shape, in the clearing operation, it is pressed by the plow blade against the road, where it deforms greatly. In the deformed state, its cross section is partially delimited by a curved contour, which merges into a linear section in a protruding corner point. The corner results from the edge between the front and narrow side of the undeformed scraper. The flow of snow tears uncontrollably through the unsteady transition of the linear section into the curved contour, so that the snow here is diffused in a diffuse manner. In addition, the corner is comparatively far away from the protruding part of the fastener, so that the snow flow is again destroyed after Umwirbelπ the corner by the fastener.

In DE 296 22 102 U1, the aim is to arrange the fastening means as far as possible on the back of the scraper in order to counteract the upward flow of snow masses as little resistance as possible. This does not succeed completely, since in the proposed solution there clamping screws are required, the head is still flowing around the snow masses. Incidentally, it is also not mentioned that flow resistances lead to obstructive turbulence in and above the plow blade. In WO 95/23894 A1, a snow plow is described, the scraper blade is pivotally mounted in the ploughshare. The scraper itself is flat and without any protruding parts of a fastener connected to a support plate, possibly by gluing, welding or vulcanization. A flexible, curved in the clearing operation rubber cloths closes the range of movement of the scraper blade in the plow blade. In the absence of protruding parts of an undisturbed runoff of snow from the scraper is expected in the shield. But this is bought with incompatibility of the scraper with conventional plows. In addition, the replacement of this scraper for wear due to their cohesive connection with the articulated storage is significantly more complex.

In view of the prior art, the present invention seeks to further develop the scraper blade for the snow blade of a snowplow so that a turbulent flow within the ploughshare is largely avoided, thus obstructing snowdrifts in the windshield of the clearing vehicle without additional equipment To avoid effort. Furthermore, the desired scraper instead of a conventional scraper to existing snowploughs without additional effort to be mounted in the same way.

The solution to this problem is based on the realization that turbulence due to flow resistance on protruding parts of the mounting center! be caused in the transition region between scraper blade and plow blade. It is proposed structurally to design the scraper flow-dynamically in such a way that the blasting snow flow flows as laminar as possible past the protruding parts of the fastening means.

This is achieved with a scraper blade of the type mentioned above in which the tangent to the contour at the apex is aligned parallel to the plane of the fastening neck and where the tangent to the contour in a neighboring point of the apex located between the road and the vertex is the plane pierces the fastening neck. The present invention is based on the basic idea of optimizing the scraper flow dynamics, so that Schneeverwirbelungen not even arise. For this purpose, the curved contour is modified so that its tangent at the apex is aligned parallel to the plane of the fastening neck. Further, the curved contour is to be designed so that in a neighboring point of the vertex, which is located below the same, a non-parallel to the plane of the fastening neck tangent clings to the contour. The tangent in the neighboring point points past the protruding part. In this way, the contour of the scraper blade receives a kind of "wave profile." The snow flowing along the scraper blade dissolves in the vicinity of the neighboring point, flows largely laminarly over the protruding parts of the fastener and is collected in the plow blade locked out.

In essence, the invention is concerned with the shape of the cross section of the scraper. The inventively designed cross-section has the following geometric features: it is at least partially bounded by a curved contour. This curved contour goes through one

Vertex. The vertex is outside the plane of the

Attachment neck of the scraper. In the vertex exactly one tangent hugs the curved contour. This tangent runs parallel to the plane, that is, the tangent at the vertex has no common

Point with the plane. Immediately adjacent to the vertex, the curved contour passes through a neighboring point. This is between street and

Vertex. In the neighboring point exactly one tangent hugs the curved contour. The tangent through the neighboring point pierces the

Plane, that is, the tangent in the neighboring point has exactly one common point with the plane.

The wave profile according to the invention need not be maintained over the entire length of the scraping. It is sufficient in principle to provide it only in the field of fasteners. However, the geometry of the scraping becomes more complex, the contour changes over the length, it creates different cross-sections. In the interest of manufacturing costs It is therefore advisable to maintain the contour according to the invention over the entire length of the scraping.

The shielding effect of the vertex is particularly effective when the apex is as close as possible to the protruding part of the fastener. Geometrically, this is achieved when the soldering point of the apex in the plane has a smaller distance to the protruding part of the fastener than to the intersection of the plane with the road. The distances mentioned are each measured as measured within the plane. As the scraper wears, the vertex "wanders" toward the road, the distance between the vertex and the intersection decreases over the life of the scraper, so that the wear limit of the scraper bar is reached when the distance from the vertex to the road is smaller than to the protruding one Part.

The turbulence-free flow of snow in the ploughshear also has a positive effect on the evacuation: The sliding behavior of the scraper is improved, the snow is thrown by the wavy profile a little in the direction of travel and loosened by the wind and therefore flows better in the ploughshare from the side. The clearance is thereby reduced, the power requirement of the clearing vehicle decreases.

o This effect is particularly effective when the vertex is in front of the plane, or even better, in front of the parts of the attachment means that are out of the plane of the attachment neck. In principle, it is possible to arrange the apex also behind the plane of the fastening neck, in this case, the contour 5 has a convex curvature at the apex, but then the snow flow must be above the vertex in the direction of travel The design of the invention according to claims 2 and 3, on the other hand, provides a concave contour in the region of the apex, which is much more favorable in terms of flow dynamics. As mentioned above, a scraper is a wearing part that wears at its street-side end. In known in the prior art scraper - see. Figure 1 and DE 81 29 044 U1 - is provided in the entire wear area of the scraper a constant footprint. With the curved contour according to the invention a variable thickness of the scraper in the direction of travel is accompanied by the wear area, which leads to uneven wear. To compensate for this, it is proposed to make the contour linear below the vertex. To compensate for a wavy contour on the front, it is also possible to provide on the back of the contour a sole point, the tangent of which is aligned parallel to the plane of the fastening neck.

The aerodynamically optimized scraper is preferably made of rubber. Since the rubber surface is too soft for the abrasive snow flow, it is recommended to reinforce the contour of the scraper at least in sections with steel. It is then a so-called sandwich scraper made of rubber and steel.

Conveniently, a hard material body is embedded in the rubber. This hard body slows the wear of the scraper on the road. The hard material body may optionally be embodied as a ceramic molded body or as a hard metal core surrounded by a steel shell. The ceramic molded body has the advantage that it can be produced by a sintering process, which allows a great deal of freedom in terms of the contour of the molded body. Thus, it is possible to let the contour of the molding run parallel to the contour of the scraper, whereby the proportion of ceramic in the wear surface always remains constant. The sintering process of the carbide core does not allow this, so it must be made with a linear contour. A flow-dynamically not optimized scraper with hard metal core describes the applicant in its published patent application DE 10 2004 029 165 A1.

As an alternative to rubber or sandwich designs, the invention can also be implemented as a solid steel scraper. The present invention will now be explained in more detail by means of exemplary embodiments. For this show:

Fig. 1: Conventional scraper in cross section

(State of the art);

5 Fig. 2: scraper strip according to the invention in cross section;

Fig. 2x: Enlargement of Figure 2 in the area of

Apex;

Fig. 3: flow behavior of the scraper from lo Figure 2;

Fig. 4: second embodiment of a scraper strip according to the invention in cross section.

The inventive scraper 3 shown in Figure 2 is fixed instead of a conventional scraper on the street-side end of a plow blade 1 with i5 help of existing fasteners 5 on the mounting neck 4. Seen from the front, the planar mounting neck 4 extends within an imaginary plane 9. Due to the principle, parts 7 of the fastening means 5 protrude in the direction of travel F from the plane 9

2o out to grab the mounting neck 4 and can fix. In Figure 2, the fastener is designed as a simple screw. The part 7, which rises out of the plane 9, is the screw head 7. Nevertheless, parts of a clamping claw or a special attachment could protrude.

The cross-section of the scraper 3 shown in FIG. 2 is delimited by a contour which comprises curved and linear sections. The contour is designed almost over its entire circumference as a curved contour 10, only in the region of the plane 9 of the fastening neck 4 and at its street-side end, the curved contour 10 by linear sections

30 11a, 11 b replaced, which will be explained later in more detail. The curvature of the Curved contour 10 can be described mathematically with the aid of tangents, which in each case conform to the contour 10 at one point.

Between road 2 and mounting neck 4, the curved contour 10 has a vertex 12; the associated tangent 13 extends here parallel to the plane 9 of the attachment neck 4. Immediately below the apex 12, in the direction of the road 2, is a neighboring point 14 whose tangent 15 pierces the plane 9 in a puncture point 16 below the apex 12. The neighboring point 14 is located at an infinitesimal distance below the apex 12. Since this is graphically barely representable and the puncture point 16 would be very far outside the drawing area, the neighboring point 14 is shown a bit further down shifted. In the embodiment shown, the contour 10 is concavely curved at the apex. In a convex curvature in the context of the invention, the puncture point 16 would be above the apex 12.

Corresponding to the concave curvature is the vertex 12 in the embodiment of Figure 1 seen in the direction of travel in front of the imaginary plane 9. His vertical distance to the plane 9 is chosen so large that it projects beyond the protruding from the plane 9 parts 7. By felling the solder from the apex 12 to the plane 9, the imaginary soldering point 120 is found. The distance of the soldering point 120 to the screw head 7 is smaller in the plane 9 than the distance of the soldering point 120 to the imaginary intersection 160 of the plane 9 the road 2. By this constellation, the screw head 7 is comparatively close to the vertex.

In its region near the road, the scraper 3 has two linear sections 11a, 11b, a first 11a approximately transversely to the direction of travel F, a second 11b parallel to the asphalt surface of the road 2. The first linear region 11a extends over the preferred wear region h of the scraper. It serves to scrape the snow from the road and to promote towards the curvature in the area of the apex 12. The second linear Area 11b serves as a footprint of the scraper 2 and is constantly sanded.

On the back of the scraper 3, its contour 10 passes through a sole point 17, the tangent 171 of which also runs parallel to the plane 9 of the neck region 4. From the second linear section 11b to the sole point 17, the contour 10 describes a curvature which ensures an approximately constant axial thickness of the scraping strip 3 over the preferred wear region h, so that the wear is as uniform as possible. It is also possible to drive the scraper blade 3 beyond the preferred wear area h, in extreme cases to the roadside approach of the mounting collar 4. However, the effect according to the invention is lost as soon as the scraper blade 3 is worn beyond the apex 12.

The Räumleiste 3 consists in its interior of rubber, which is reinforced on the contour with vulcanised steel (not shown). In the wear region h, a hard material body 18 is embedded whose contour runs essentially parallel to the contour 10 of the scraper blade 3 in this region. The green compact of a ceramic hard material body can be shaped accordingly and then sintered. The hard material body 18 may extend over the entire length of the Räumleiste 3 or it may be a plurality of columnar

Hard material be side by side embedded in the scraper 3.

The flow behavior of the scraper strip according to the invention from FIG. 2 is shown in FIG. The snow 6 lying on the road 2 is released from the first linear section 11 a and accelerated in the direction of the apex 12. Since the contour of the scraper blade behind the apex 12 lowers in the direction of the fastening neck 4, the snow stream 19 retains its flow direction parallel to the plane 9 and flows past the protruding parts 7 of the fastening 5 without being swirled there. In the plow blade 1, he is directed accordingly to the side. From the linear portion 11a to the attachment neck 4, the corrugated portion of the contour forms a streamlined projection in the region of the apex 12 in which "Snow shadows" are the protruding parts 7 of the fastener 5. A swirling or cumming of the snow is thus effectively avoided.

FIG. 4 shows a second embodiment of the scraper blade according to the invention.

This is largely symmetrical and, in the preferred wear region h, has a particularly long linear section 11a in which a hard material body 18 surrounds one of a steel jacket 20

Carbide core 21 is located. Because the contour of the carbide core is not arbitrary

Freeform surface can assume its contour is substantially linear and extends parallel to the linear portion 11a in the preferred wear area h.

Claims

claims

1. scraper (3) for the plow blade (1) of a snow plow, which is provided at its the road to be cleared (2) facing away from the end with a substantially planar mounting neck (4), which is intended by fastening means (5) and to be fixed to the plow blade (1), wherein at least parts (7) of the attachment means (5) rise out of the plane (9) of the attachment neck (4) in the direction of travel (F) and the cross-section of the scraper blade (3) at least in the region of the fastening means (5) at least partially bounded by a curved contour (10) passing between the road (2) and mounting neck (4) lying outside the plane (9) vertex (12), characterized in that the tangent (13) is aligned at the curved contour (10) at the vertex (12) parallel to the plane (9) of the attachment neck (4), and that the tangent (15) at the curved contour (10) in a neighboring point (12). 14) of the apex (12), which lies between the road (2) and vertex (12) penetrates the plane (9) of the fastening neck (4).

2. scraper (3) according to claim 1, characterized in that the apex (12) in the plane (9) has a soldering point (120), wherein the within the plane (9) measured distance of this Lotpunkts (120) to the projecting Part (7) of the fastening means (5) is smaller than the measured within the plane (9) distance of the Lotpunkts (120) to the intersection (160) of the plane (9) with the road (2).

3. scraper (3) according to claim 1 or 2, characterized in that the apex (12) in front of the plane (9) of the fastening neck (4).

4. scraper bar (3) according to claim 3, characterized in that the apex (12) in front of the parts (7) of the fastening means (5).

5. scraper (3) according to any one of the preceding claims, characterized in that the cross section of the scraper (3) between the curved contour (10) and the road (2) by a linear portion (11 a) is bounded.

6. scraper (3) according to any one of the preceding claims, characterized in that the contour (10) between the fastening neck (4) and road (2) behind a plane (9) of the fastening neck (4) located sole point (17) passes through wherein the tangent (171) on the contour (10) in the sole point (17) is aligned parallel to the plane (9) of the fastening neck (4).

7. Scraper (3) according to one of the preceding claims, characterized in that the scraper strip (13) consists at least partially of rubber.

8. scraper (3) according to claim 7, characterized in that the contour (10) of the scraper bar (3) is at least partially reinforced with steel.

9. scraper strip (3) according to claim 7 or 8, characterized in that in the rubber at least one hard material body (18) is embedded.

10. Scraper (3) according to claim 9, characterized in that it is in the hard material body (18) is a ceramic molded body whose contour is parallel to the contour (10) of the scraper (3).

11. Scraper (3) according to claim 9, characterized in that it is in the hard material body (18) surrounded by a steel shell (20) hard metal core (21).

12. scraper (3) according to one of claims 1 to 6, characterized in that the scraper bar (13) consists of steel.