RU2779801C2 - Spike, its case, and installation method, as well as clutch device - Google Patents

Abstract

FIELD: tire industry.

SUBSTANCE: lateral periphery (P) of first head (110) of case (100) of a spike contains at least one deepened part (113). Lateral width (L) of deepened part (113) is from 5 to 10% of a circumference of lateral periphery (P) of first head (110). Depth (D_p) of deepened part (113) is from 15 to 50% of lateral width (L) of deepened part (113), and this is deepened part (113).

EFFECT: increase in the reliability of attachment of spikes in a tire and efficiency of grip on the road surface.

19 cl, 7 dwg, 1 tbl

Description

FIELD OF TECHNOLOGY TO WHICH THE INVENTION RELATES

[0001] The present invention relates to clutch devices. In particular, the invention relates to winter tires. More specifically, the invention relates to a body of an anti-skid stud, an anti-skid stud, a clutch device and a method for installing an anti-skid stud according to the preambles of claims 1, 17, 18 and 20, respectively.

BACKGROUND OF THE INVENTION

[0002] Grip devices such as pneumatic vehicle tires, shoes, Nordic walking poles, etc. are typically equipped with anti-skid studs to improve traction on slippery surfaces. Thus, anti-skid studs are very common in winter tires for vehicles, and the tread of these tires is specially designed to have stud holes to accommodate such anti-skid studs. Also, it is common practice to have a non-rotationally shaped pin or pin designed to engage in the ground, and to install it in a specific orientation relative to the axis of rotation of the tire in order to maximize traction. The design principle behind this orientation is that the pin engages with the ground along its longest dimension. Due to this need to orient the studs relative to the axis of rotation of the tire, the installation of the studs is a difficult task because the studs themselves are quite small. FI 114692 B discloses a special installation tool to facilitate automatic installation, which has been designed to fit the particular shape of the bottom flange of the stud body. The bottom flange has a rotationally non-symmetrical shape to create a rigid contact area for gripping the inserter. Because the stud pin is aligned to a certain extent with the shape of the bottom flange, pin orientation is possible using the shape of the flange as a guide. Thus, the orientation is more accurate because the landmark is larger than the pin.

[0003] US 2016/0311267 A1, on the other hand, discloses a bottom flange having four chamfered corners connected by four wide and shallow concave sides.

[0004] However, there is a need to be able to accurately orient the pins on the studs while minimizing the size of the stud receiving hole, or at least to develop an effective alternative to existing solutions for equipping clutch devices with anti-skid studs.

DISCLOSURE OF THE INVENTION

[0005] In an innovative approach, a solution is provided by a stud body that includes a rotationally non-symmetrical first head at one end of the body, the first head having a height along the first elongated dimension of the body. The housing also includes a second head at the opposite end of the housing along the first extended dimension of the housing. The lateral periphery of the first head contains at least one recessed part. The recessed portion has a smaller diameter compared to the maximum diameter of the first head, the difference in diameter determining the depth of the recess. The recessed part extends along the height of the first head along the first elongated dimension of the body and acts on the lateral periphery of the first head along the lateral width when viewed perpendicular to the first elongated dimension. The lateral width of the recessed part is from 5 to 10% of the circumference of the lateral periphery of the first head. The depth of the recess is 15 to 50% of the side width of the recess, and this is the recess.

[0006] The stud can be made with such a body and a pin extending from any end of the body, such as a bowl, with this pin installed in a predetermined orientation relative to the recess of the bottom flange.

[0007] In addition, the clutch device can be manufactured using such a pin installed inside the receiving recesses of the engagement surface of the specified clutch device.

[0008] In addition, a method of installing such a spike inside the friction surface of the clutch device is provided. In this method, the presence of a clutch device is provided, having a tread part equipped with a hole for a stud. The stud is grasped by the lower flange by means of an automatic gripping device containing a main elongated component parallel to the main elongated size of the body, and the gripping device engages a recessed part passing along the height of the lower flange on its lateral periphery, with at least partial immersion in order to fix the angular orientation of the stud regarding the gripper. The stud is oriented into the correct orientation by using the recess as an orientation indicator and is inserted into the stud hole.

[0009] More specifically, the invention is characterized by the characterizing part of the independent claims of the appended claims.

[0010] Significant benefits are achieved with the present solution. The recessed part facilitates easy orientation of the hard metal pin. Due to the fact that the recesses may be quite narrow and shallow, the bottom flange may have a generally circular cross-section, while the receiving opening on the tire may be small. In addition, the recessed portion is designed to fit with only three gripper fingers, requiring less space in the tenon hole compared to four fingers. Additionally, by careful selection of the shape and size of the recessed portion, the torque resistance, that is, the ability to resist rotation about the central axis of the stud, can be greatly improved.

[0011] Additional advantages are described in connection with particular embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Some embodiments are described below in more detail with reference to the accompanying drawings, in which:

in fig. 1 is a side view of a stud body according to at least some embodiments of the present invention;

in fig. 2 shows a bottom view of the stud body of FIG. one;

in fig. 3 is a bottom view of a stud body according to other embodiments of the present invention;

in fig. 4 is a side view of a stud body according to additional other embodiments of the present invention;

in fig. 5 is a bottom view of the stud body of FIG. four; and

in fig. 6 shows a schematic representation of the geometric relationship between the recess and the rest of the first head of the stud body, as viewed from below.

IMPLEMENTATION OF THE INVENTION

[0013] FIG. 1 is a side view of a stud body 100 according to the first illustrative embodiment. As used herein, the term "stud" refers to an anti-skid insert used to improve the grip of various traction devices such as tires, traction control mats, shoes, Nordic walking poles, etc., on slippery surfaces. As can be seen, housing 100 has an elongated shape that is lightened or "simplistic" to facilitate insertion of a clutch device, such as a tire, into the grip surface. The body 100 is elongated along a longitudinal axis, which can be defined as the dimension along which the body 100 is most extended. This dimension is called the first extended dimension A, which will serve to define the axis across which the hull cross-sectional shapes will be considered.

[0014] The body 100 has three main parts, namely the first head 110 at one end of the body 100, the second head 130 at the opposite end of the body 100 along the first extended dimension A, and the intermediate part 120 connecting the first head 110 and the second head 130. In the shown example, the first head 110 is the bottom flange of the housing 100 and the second head 130 is the top. The first head 110 has the largest diameter among the parts and has a transitional part, which may be a chamfer, rounding, or a combination thereof, connecting the side surface of the head 110 with the end surface 112. The second head 130 has a smaller diameter than the first head 110. The side surface of the second head 130 transitions to end surface 132 via a transition, which may be a chamfer, rounding, or a combination of both. Intermediate portion 120 has the smallest diameter of the three parts and has four transition members 121, 122, 132, 124 from first head 110 to intermediate portion 120 and from intermediate portion 120 to second head 130. The specific body 100 shown in FIG. 1 is also rotationally non-symmetrical with respect to the first longitudinal axis A. In other words, the first head 110 has a rotationally non-symmetrical cross-sectional shape in a plane perpendicular to the main elongated dimension A. Although the second head 130 and/or the intermediate portion 120 may be rotationally symmetrical with respect to of the first longitudinal axis A, the first head 110 is not due to the recessed portion 113 or the parts 113 making the cross-sectional shape of the first head 110 not round.

[0015] FIG. 2 showing the housing 100 from below, the recesses 113 located on the first head 110 are more clearly shown. The recessed portions 113 act on the lateral surface at a certain circumferential distance, ie they have a certain width and up to a certain radial depth, which is discussed separately below. In the example shown, there are three recessed portions 113 equally spaced along the lateral periphery of the first head 110. Alternatively, the spacing may be unequal. The recessed portion 113 has a concave cross-sectional shape that can be described as resembling a U.

[0016] The embodiment of FIG. 1, 2 can be modified. In FIG. 3 shows a modification of the embodiment of FIG. 2. In FIG. 3, the side surface of the first head 110 has only one recessed portion 113 instead of three. Of course, two recessed parts can be provided in a similar manner. Additionally or alternatively, the side surface of the first head 110 has a flat section 114, that is, a chamfer, as viewed along the longitudinal axis of the body. The flat section 114 provides a manufacturing advantage in that it provides a home orientation for the body. By means of the flat section 114, the body can be oriented with respect to the production plant's coordinate system, while the tenon orientation can be fixed with respect to the reference system. When the position and orientation of the stud are known, the stud can be correctly oriented with respect to the body in the same reference system, i.e. the production machine's coordinate system. Now that the pin is in a certain relative orientation with respect to the body of the stud, the stud can be properly installed inside the tire with the pin properly oriented with respect to the direction of rotation of the tire.

[0017] FIG. 4 shows another option. Housing 100 has a general structure generally similar to that shown in FIG. 1, except for the shape of the recessed portions 113. Accordingly, the body 100 has a wide first head 110 acting as a flange, a narrower second head 130 acting as a top, and a narrowest intermediate portion 120 connecting the two heads through adapters 121- 124. In FIG. 5 shows more clearly the shape of the recesses 113. As can be seen, in general, the U-shaped recesses 113 of FIG. 2 have been replaced as a whole with V-shaped recesses so that the sides of the recesses are straight. The lower part of the recess 113 is rounded.

[0018] With reference to FIG. 1-5, it becomes clear that the number and shape of recessed sections 113 can vary greatly. Preferably, however, the recessed portion 113 is shaped such that the body 100 can be gripped by the gripping device at least partially submerged. This means that the recess 113 is shaped to accommodate the "fingers" of the gripper so that the "fingers" contact the body 100 along the contour of the recess 113. It is also understood that the structure can be rotated in the sense that the first head 110 can be used as the top and the second head 130 as the bottom flange. In addition, the narrow neck intermediate portion 120 may be omitted, making the body 100 somewhat uniform in diameter, or the intermediate portion may have the same diameter as the first or second head, with the other head having a larger or smaller diameter than the other. .

[0019] Referring now to the dimensions of the recessed portions 113 in more detail, referring to FIG. 6, 7, which are schematic simplifications of the variants of FIG. 5, in which the first head contains only one recessed portion 113. In FIG. 6, the lower part of the recessed portion 113 is sharp, while in FIG. 7, the lower part of the recessed portion 113 is rounded. However, explanations of the geometric relationships between the recessed portion and the first head shown in FIG. 6, 7 are applicable to all embodiments described in this document.

[0020] FIG. 6 shows a recessed portion 113 having a pointed V-shaped cross section as viewed along the longitudinal axis of the housing. In this case, the cross-sectional shape of the first head 110 is generally circular despite the recessed portion 113. In other words, the lateral periphery P has an equal maximum radius r _max measured from the center, i. from the origin or pole O, outside the recess 113. Here, the center refers to the point of intersection of two arbitrary lines drawn along the largest diameter of the first head 110, denoted as D _max . The largest diameter D _max gives the maximum radius r _max according to the equation D _max = 2⋅r _max , which in turn gives the circle according to the equation 2⋅π⋅r _max . In this context, the circumference is obtained from the largest diameter of the first head. On the other hand, the area is the length of the arc of the recessed part across the polar azimuth formed between the two. The center is not the center of mass of the first head 110 because there is no material in the recessed portion 113 compared to the section having the largest diameter D _max . The recess 113 acts on the lateral periphery P along a length L, which can be considered as the "width" of the recess 113 as viewed from the body 100. Thus, the recess 113 is a reduced diameter lateral section of the lateral periphery P. In the example shown, recess 113 is symmetrical in that the minimum diameter is at the center of recess 113.

[0021] In FIG. 6, the radius and thus the diameter of the first head 110 decreases linearly from the maximum value r _max to the minimum value r _min and increases again to the maximum value r _max , giving the sides of the recess a straight shape. Non-linear changes are also possible to impart curvature to the sides of the recess. In FIG. 6, the minimum diameter of the first head 110 is located at the bottom of the recessed portion 113 and is indicated as r _min . The difference between the minimum diameter at the bottom of the recess 113 and the maximum diameter outside the recess is the depth D _p of the recess. It should also be noted that the contour sections of the recessed portion 113 extend at an oblique angle with respect to the radius of the cross section. The same applies to the example of FIG. 7 and is true for all embodiments shown. More specifically, the recess 113 is defined by a contour extending from the point of maximum diameter D _max to the point of minimum diameter D _min at the bottom of the recess 113 at an angle that is not a right angle with respect to the tangent at said maximum diameter point. This means that the outline of the recessed portion 113 may be a pointed V-shape, a rounded V-shape, a U-shape, a C-shape, or any other shape in which the outline is not at right angles to the edge tangent between a recessed part and a part having a maximum diameter.

[0022] FIG. 6, 7 shows the nature of the recessed portion 113 in polar coordinates. In these drawings, the angle α at which the recess 113 acts on the first head 110 defines the polar region S of the recess 113 as a function of the radius of the first head 110 outside the region of the recess 113. In this context, the term "region" refers to the peripheral or circumferential length the area of influence of the recessed portion 113. In other words, the azimuth angle α is formed between the two maximum radii r _max limiting the recessed portion 113 to each other. The origin or pole O is located at the intersection of two imaginary lines D _max diameter drawn across the cross section with the largest diameter. It may be located approximately in the center of the cross section of the recessed portion 113 as viewed along the longitudinal axis of the housing 100, provided that the recessed portions 113 are relatively small. As indicated above, the lateral periphery P is deepened in width, which can be considered as an area S in the polar coordinate system. To arrive at this definition, assume that the nearest maximum radius point r _max on the right side of the recess 113 forms the first measurement point, while the point of the nearest maximum radius r _max on the left side of the recess 113 of the recess forms the second measurement point. In the polar coordinate system, the opening angle of the recess 113 is the polar azimuthal angle α between the first and second measurement points when the nearest maximum radii r _max outside the recess 113 determine the radial extent. Accordingly, the polar azimuthal region S of the recessed portion 113 is the difference in polar angle between the first and second measurement points along the maximum radius r _max .

[0023] It has been found that the shape of the recessed portion 113 is significant to how the stud body 100 can resist rotation about the first extended dimension A, that is, about the longitudinal axis of the body 100 according to the illustrated embodiments. Several physical simulations and tests of the Nokian Hakkapeliitta 7 tire were prepared to study torque resistance. It was not at all obvious which shape would provide the best results. The test results are shown in Table 1.

Table 1: Simulation and testing results. # A B C [%] D[°] E [%] F [%] one 0 N/A 0 0 0 100 2 one wide deep U 15.7 56.6 25 90.9 3 one narrow, deep beveled U 8.9 32.2 46 91.6 four 3 narrow, deep beveled U 9.2 33.0 45 95.8 5 one radial deep U 8.1 29.3 fifty 104.6 6 3 radial deep U 8.2 29.3 fifty 90.2 7 one radial shallow U 6.8 24.7 47 107.4 eight 3 radial shallow U 6.9 24.7 47 105.6 9 one wide deep U 10.7 38.4 42 94.7 ten 3 wide deep U 10.7 38.5 41 111.9 eleven one narrow shallow U 7.7 27.7 39 123.2 12 3 narrow shallow U 7.7 27.8 39 118.2 13 one narrow, deep V 10.8 38.7 44 107.4 fourteen 3 narrow, deep V 10.8 38.8 44 101.1 fifteen one narrow shallow V 7.5 27.1 36 113.0 16 3 narrow shallow V 7.5 27 36 128.1 17 6 narrow shallow V with one beveled section with a maximum diameter 6.0 21.7 45 113 eighteen 7 narrow shallow V with two beveled sections with a maximum diameter 9.1 32.8 thirty 108.9 19 3 narrow shallow V with one beveled section with a maximum diameter 17.1 61.5 16 112.3

where:

# - test number,

A is the number of recessed parts,

B - the shape of recessed parts,

C - the proportion of the area L of one recessed part 113 relative to the circumference of the first head 110,

D - azimuth angle α of one recessed part 113,

E is the ratio between the depth D _p and the area L of the recessed part (D _p /L), and

F is the change in torque resistance.

[0024] It is concluded that the improvement in torque resistance is achieved with relatively narrow and shallow recessed portions that preferably do not have "straight" walls, i.e. that do not extend radially from the periphery of the first head towards the center. It was also concluded that the addition of recessed parts had little or no effect on the torque resistance. With regard to the lateral width L of the recessed portion 113, it has been found that improvements are achieved when the width L is 5 to 10% of the circumference of the lateral periphery P of the first head 110. However, the best results were obtained at 7-8%. With regard to the depth D _p of the recessed portion 113, an improvement in torque resistance was achieved when the depth D _p of the recessed portion 113 was 15 to 50% of the side width L. However, the best results were obtained at 30 to 40%. When viewed in polar coordinates, improvements were achieved when the azimuth angle α was chosen between 25 and 30 degrees. A preferred sub-range of the azimuth angle α is from 26 to 29 degrees, in particular from 27 to 28 degrees.

[0025] The stud body described above can be used as a base for an anti-skid insert that also includes a pin at either end. The pin may be a hard cermet or other material that is more wear resistant than the body. The pin is preferably located on the second head so that the first head can act as a bottom flange. According to such an embodiment, preferably the lower flange has a larger diameter than the second head so that the stud can be gripped from the side by a gripping device extending along the first extended dimension of the stud.

[0026] Such a stud may preferably be inserted into the stud receiving hole of a clutch device such as a tire. First, a stud hole is made in the grip surface of the tire, which may contain a tread pattern. The stud is inserted by gripping the stud by the bottom flange by means of an automatic gripping device having a main longitudinal component parallel to the main elongated body dimension. An example of this would be gripping fingers parallel to the first elongated body dimension. Upon gripping, the gripping device engages the recessed portion with at least partial immersion so as to fix the angular orientation of the stud relative to the gripping device. Since the orientation of the pin is at a certain angle to the location of the recessed portion, the orientation of the pin can be determined by a gripping device located at a particular angle to the first elongated dimension of the body of the stud. In other words, the recessed portion may assist in orienting the stud in a preferred orientation with respect to the rolling surface of the tire. Since the recessed portion acts as an orientation indicator, the stud can provide the maximum friction available between it and the driving surface.

[0027] It should be understood that the disclosed embodiments of the invention are not limited to the specific structures, process steps, or materials disclosed herein, but are extended to their equivalents, which can be used by a person skilled in the art. It should also be understood that the terminology used herein is used only to describe specific embodiments and is not intended to be limiting.

[0028] As used herein, reference to one embodiment or embodiment means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention. Thus, the expressions "in one embodiment" or "in an embodiment" in various places in this specification do not necessarily refer to the same embodiment. When referring to a numerical value using an expression such as "approximately" or "essentially", the exact numerical value is also disclosed.

[0029] The plurality of elements, structural elements, composite elements and/or materials used can be presented for convenience in a general list. However, these lists should be understood as if each element of the list is identified individually as a separate and unique element. Thus, no individual element of such a list should be considered de facto equivalent to any other element of the same list merely by virtue of their representation in the general group, unless otherwise indicated. Additionally, various embodiments and an example of the present invention may be mentioned herein along with alternatives to its various components. It should be understood that such embodiments, examples, and alternatives are not to be considered actual equivalents of each other, but as separate and independent embodiments of the present invention.

[0030] In addition, the features, structures, or characteristics described may be combined in any suitable manner in one or more embodiments. This description provides numerous specific details, such as examples of lengths, widths, shapes, etc., to facilitate a thorough understanding of the embodiments of the invention. However, one of ordinary skill in the art will appreciate that the invention may be practiced without one or more specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail in order to avoid obscuring aspects of the invention.

[0031] Although the above examples illustrate the principles of the present invention in one or more specific applications, one skilled in the art will appreciate that numerous modifications to form, use, and implementation details can be made without inventive skill and without departing from the principles and concepts of the invention. Accordingly, the invention is intended to be limited only by the following claims.

[0032] The verbs "comprise" and "include" are used in this document as loose restrictions, not excluding or requiring the presence of also not listed features. The features listed in the dependent claims may be freely combined, unless expressly stated otherwise. In addition, it should be understood that the use of the singular in this document does not exclude the plural.

LIST OF REFERENCES

room part room part 100 frame 131 transitional part 110 first head 123 end surface 111 transitional part A first extended dimension 112 end surface _Dp depth 113 deepening _Dmax maximum diameter 114 chamfer L region 120 intermediate part O origin 121 transition element P lateral periphery 122 transition element _rmax maximum radius 123 transition element _rmin minimum radius 124 transition element α corner 130 second head

Link List

FI 114692 B

US 2016/0311267 A1.

Claims (36)

1. The body (100) of the stud for the friction surface of the clutch device, containing: - a rotationally asymmetric first head (110) at one end of the body (100), wherein the first head (110) has a height along the first extended dimension (A) of the body (100), while the lateral periphery (P) of the first head (110) contains at least one recessed part (113), which: has a smaller diameter compared to the maximum diameter of the first head (110), the difference in diameter determining the depth (D) of the recess (133), passes along the height of the first head (110) along the first extended dimension (A) of the body (100), and the recessed part (113) acts on the lateral periphery (P) of the first head (110) along the lateral width (L) when viewed perpendicular to the first extended dimension (A), and along the polar region (S) when viewed along the first extended dimension (A), and - the second head (130) at the opposite end of the body (100) along the first extended dimension (A), characterized in that: - the polar region (S) of the recessed part (113) is from 5 to 8% of the circumference of the lateral periphery (P) of the first head (110), while - the depth (D _p ) of the recessed part (113) is from 30 to 50% of the polar region (S) of the recessed part (113). 2. The body (100) of the stud according to claim. 1, characterized in that the first extended dimension of the body (100) is the main extended dimension along which the body (100) has the greatest extent. 3. The body (100) of the stud according to claim 2, characterized in that the first head (110) is the lower flange. 4. The stud body (100) according to claim 2 or 3, characterized in that the second head (130) is a bowl. 5. Housing (100) spike according to any one of paragraphs. 1-4, characterized in that the lateral periphery (P) of the first head (110) is the outermost circumference from the center of the first head (110). 6. Housing (100) spike according to any one of paragraphs. 1-5, characterized in that the first head (110) in cross section along the first extended dimension (A) has a shape based on a circle containing one or more recessed parts (113) made along the periphery located at a distance from each other. 7. Housing (100) spike according to any one of paragraphs. 1-6, characterized in that the body (100) contains an intermediate part (120) connecting the first head (110) with the second head (130) along the first extended dimension (A), while the intermediate part (120) is smaller in cross section than the first head (110), or the second head (130), or both heads. 8. Housing (100) spike according to any one of paragraphs. 1-7, characterized in that the recessed part (113) acts on the side of the first head (110) between two adjacent points of maximum diameter (D _max ) of the first head (110). 9. The body (100) of the stud according to claim 8, characterized in that the recessed part (113) is formed by a contour extending from the point of maximum diameter (D _max ) to the point of minimum diameter (D _min ) on the lower part of the recessed part (113) under an oblique angle from the tangent at the specified point of the maximum diameter of the first head (110), when viewed in cross section along the first extended dimension. 10. Housing (100) spike according to any one of paragraphs. 1-9, characterized in that the polar region (S) of the recess (113) is from 7 to 8% of the circumference of the lateral periphery (P) of the first head (110). 11. Housing (100) spike according to any one of paragraphs. 1-10, characterized in that the depth (D) of the recessed part (113) is from 30 to 40% of the polar region (S) of the recessed part (113). 12. Housing (100) spike according to any one of paragraphs. 1-11, characterized in that the recessed part (113) passes through the polar region (S), along which the recessed part (113) acts on the lateral periphery (P) of the first head (110) between the two nearest adjacent polar maximum radii (r _max ) in the cross section of the first head (110) along the first extended dimension of the body (100), wherein the polar azimuth angle (α) of the recess (113) is from 25 to 30 degrees. 13. The body (100) of the stud according to claim 12, characterized in that the polar azimuth angle (α) of the recessed part (113) is from 26 to 29 degrees, preferably from 27 to 28 degrees. 14. Housing (100) spike according to any one of paragraphs. 1-13, characterized in that the housing (100) contains no more than three such recesses (133), preferably one or three. 15. Housing (100) spike according to any one of paragraphs. 1-14, characterized in that the side surface of the first head (110) has a flat section (114) when viewed along the longitudinal axis of the housing (100). 16. A spike containing: - housing (100) according to any one of paragraphs. 1-15, and - a pin extending from the bowl, the pin being mounted in a predetermined orientation relative to the recess of the bottom flange. 17. A clutch device, such as a pneumatic tire of a vehicle, for engaging with the ground during movement, the clutch device comprising: - frame, - a tread part located on the frame and made with the possibility of contact with the ground, while the tread part contains a tread pattern equipped with grooves for studs, and - a plurality of studs installed inside the recesses of the engagement surface, characterized in that the studs contain housings according to any one of paragraphs. 1-15. 18. The clutch device according to claim 17, characterized in that the spike is made according to claim 16. 19. The method of installing the stud according to claim 16 inside the friction surface of the clutch device, and the method includes the steps of: - provide the presence of a clutch device with a tread part equipped with a hole for a stud, - the tongue is captured by the lower flange by means of an automatic gripping device containing the main elongated component parallel to the main elongated size of the body, and the gripping device engages the recessed part passing along the height of the lower flange on its lateral periphery, at least partially immersed, in order to fix the angular orientation the spike relative to the gripper, - orient the tenon to obtain the correct orientation by using the dimple as an orientation indicator, - insert the spike into the hole for the spike.

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