DE102021118576A1 - Clamping sleeve and a method for its manufacture - Google Patents

Abstract

A collet for receiving and storing a sensor (105) in a bore (102) is disclosed. The bore (102) is defined in a radial and an axial direction. The clamping sleeve comprises a sleeve body (110) for receiving the sensor (105), the sleeve body (110) having at least one roughened area (120) with increased surface roughness on a surface (115) in order to hold the clamping sleeve together with the sensor ( 105) in the bore (102).

Description

The present invention relates to a ferrule and a method of making the same, and more particularly to a ferrule having barbs for improved fixation in receptacles (e.g. bores).

Clamping sleeves are used when installing speed sensors in trucks, for example. When using conventional clamping sleeves, a high level of force must be exerted, for example to insert the speed sensor and hold it in a bore together with the clamping sleeve. A conventional ferrule is, for example, in EP3281019B1 discloses that in this conventional ferrule spring tongues are provided which are slightly raised, rounded or flattened to allow for easier installation.

5A illustrates the problem when inserting a sensor 105 into a conventional clamping sleeve 520. The clamping sleeve 520 comprises spring tongues 522 and 523, as well as contact surfaces 524. The spring tongues 522 and 523 press the sensor 105 downwards with an insertion force F1 (see tilting force F2 in the adjacent force parallelogram).Since the bearing surface 524 is not exactly opposite, there is a tilting angle 510 which is not equal to zero and presses the sensor 105 against another bearing surface 524. As a result, the insertion force F1 has to be increased by an amplifying force F4 in order to bring the sensor 105 from the tilted position into the horizontal position (tilt angle 510 equal to zero). The resulting insertion force F3 causes sensor 105 to be aligned.

5B shows the insertion force as a function of the path, the force having a first force peak 501 and a second force peak 502. The first force peak 501 is the force required to overcome a spring force of the first spring tongue 522 . After this has taken place, the insertion force drops, only to then increase again significantly--when it hits the further support surface 524--because of the additional static friction. Since the spring force of the second spring tongue 523 presses the sensor 105 downwards (see 5A ), the static friction increases significantly and the second force peak 502 exceeds the first force peak 501. This pronounced excessive force is a disadvantage of conventional clamping sleeves. If the sensor 105 is completely installed, the displacement force on the force plateau is 503, which corresponds to the application in the field. The sensor 105 is mounted and can be displaced in the axial direction via a force (greater than the plateau force 503).

In order to facilitate installation of the sensor 105 in the clamping sleeve 520, the ends of the spring tongue 522 can be rounded off (see the above-mentioned prior art), but it can then happen that the static friction of the sensor 105 in the clamping sleeve is higher than the static friction between the collet 520 and the bore. Unfortunately, this then leads to the clamping sleeve 520 being pushed out of the receiving bore together with the sensor 105 under certain circumstances. A reliable hold of the sensor 105 and proper functioning of the clamping sleeve cannot always be guaranteed. This is because the rounded ends of the spring tongues no longer serve as an abutment and there is therefore a risk of the clamping sleeve being pushed out of the bore.

Thus, there is a need for alternative designs to allow for easy installation with improved retention of the sleeve in a bore.

At least part of the above problems are solved by a ferrule according to claim 1 and a method for its manufacture according to claim 10. The dependent claims define further advantageous embodiments of the subject matter of the independent claims.

The present invention relates to a collet for receiving and supporting a sensor in a bore. The bore defines a radial and an axial direction. The clamping sleeve comprises a sleeve body for receiving the sensor, the sleeve body having at least one roughened area (with an increased surface roughness) on one surface. This ensures, for example, that the clamping sleeve is held together with the sensor in the bore. The surface with increased surface roughness faces the inner surface of the bore after insertion of the ferrule into the bore.

Optionally, the at least one roughened area includes one or more of the following shapes: a rib, a groove, a herringbone pattern, a barb, a ratchet shape, a zigzag shape, a V-shape, an II-shape, or a combination thereof. Barbs can also be formed on the forms mentioned in order to fix the clamping sleeve in the bore. A person skilled in the art understands a barb to be a structure that hardly impedes insertion but prevents or at least makes it difficult to reverse movement.

Optionally, the at least one roughened area includes a first roughened area and/or a second roughened area. The first roughened area can extend in the axial direction along a continuous web. Openings or recesses or spring elements can be provided in the clamping sleeve on both sides of the web. The second roughened area may extend in a circumferential direction.

Advantageously, the roughened areas are therefore arranged as profiles in such a way that they enable easy installation of the sleeve, but when they are pushed out they engage or dig into the surface of the hole in such a way that it is reliably prevented from being pushed out. A design in which the area between exemplary spring elements is used is particularly advantageous, although the exemplary embodiments should not be restricted to this. According to further exemplary embodiments, a radially circumferential surface is also used in order to form the roughened areas there.

Optionally, the sleeve body includes a plurality of guide elements that extend radially inward and are designed to prevent the sensor from tilting when it is inserted into the clamping sleeve. The guide elements provide support points or support rails, for example, in order to guide the sensor.

Optionally, the guide elements include at least one of the following: an axially extending indentation, an indentation, a radially inwardly bent tab, a guide bar. If the sleeve body has a C-shape, a tab can be formed in an edge region or on a recess edge in order to provide guidance for the sensor when it is inserted into the clamping sleeve, with the tab being able to extend at least partially in the axial direction.

Optionally, the guide members include barbs, the barbs extending radially outward to block withdrawal of the collet from the bore.

The bore may have an axially extending groove and the sleeve body may have a C-shape in a cross section perpendicular to the axial direction such that opposite edge portions of the sleeve body form an axial gap. Optionally, the sleeve body is bent radially inwards and then outwards in the circumferential direction in the edge region in order to form a radial projection. The projection can then engage in the groove and provide an anti-twist device.

The sleeve body optionally comprises at least one spring tongue which has a free end and a fastening end. The attachment end establishes the attachment to the sleeve body, while the free end can be oscillated against a spring force, so that the spring tongue supports the sensor against the bore, exerting the spring force, and supports it in a displaceable manner when the clamping sleeve together with the sensor is at least partially in the bore located.

Optionally, the sleeve body comprises at least one stamping burr, which extends radially inwards or radially outwards from a bore surface after the sleeve body has been inserted into the bore. The punching burr can be formed on the spring tongue or on another edge (e.g. on a recess, on the gap, etc.). The various punching burrs can all point in the same direction or also point in different directions.

• - Bereitstellen eines Hülsenkörpers;
• - Umformen des Hülsenkörpers in eine zylindrische Form zur Aufnahme und Lagerung des Sensors in der Bohrung; und
• - Ausbilden zumindest eines aufgerauten Bereiches auf einer Oberfläche des Hülsenkörpers, um einen Halt der Klemmhülse zusammen mit dem Sensor in der Bohrung zu sichern.

Embodiments also relate to a method for producing a collet that can be inserted into a bore. The bore again defines a radial direction and an axial direction. The procedure includes:

• - Providing a sleeve body;
• - Forming the sleeve body into a cylindrical shape for receiving and storing the sensor in the bore; and
• - Forming at least one roughened area on a surface of the sleeve body in order to secure a hold of the collet together with the sensor in the bore.

The at least one roughened area therefore faces the bore or an inner surface after the clamping sleeve has been inserted.

The forming step can be performed before or after the forming step. In principle, a list of procedural steps does not imply any order. All steps can be performed in any order, as long as a particular order is not mandatory for a desired result.

Optionally, forming the at least one roughened area includes at least one of the following steps: stamping, embossing, notching, scoring, incomplete machining.

Embodiments overcome at least some of the disadvantages of conventional collets by preventing the collet from slipping out of the bore by roughening a radially outer surface. The roughening takes place towards the bore and thus increases the static friction between the collet and an inner wall of the bore.

• 1A,1 B zeigen eine Klemmhülse gemäß einem Ausführungsbeispiel der vorliegenden Erfindung.
• 2A zeigt weitere Details der aufgerauten Bereiche der Klemmhülse gemäß Ausführungsbeispielen.
• 2B zeigt weitere Details der Führungselemente der Klemmhülse gemäß Ausführungsbeispielen.
• 3 zeigt eine Querschnittsansicht der Klemmhülse mit einem Sensor zur Veranschaulichung der Führungselemente aus der 2B.
• 4 zeigt ein schematisches Flussdiagramm für ein Verfahren zur Herstellung der Klemmhülse gemäß Ausführungsbeispielen.
• 5A,5B veranschaulicht Nachteile von konventionellen Klemmhülsen.

The embodiments of the present invention will be better understood from the following detailed description and the accompanying drawings of the various embodiments, which, however, should not be taken to limit the disclosure to the specific embodiments, but are for explanation and understanding only.

• 1A , 1 B show a ferrule according to an embodiment of the present invention.
• 2A shows further details of the roughened areas of the clamping sleeve according to exemplary embodiments.
• 2 B shows further details of the guide elements of the clamping sleeve according to exemplary embodiments.
• 3 shows a cross-sectional view of the collet with a sensor to illustrate the guide elements of FIG 2 B .
• 4 shows a schematic flow diagram for a method for producing the clamping sleeve according to exemplary embodiments.
• 5A , 5B illustrates disadvantages of conventional ferrules.

1A FIG. 1 shows a collet which is designed to receive a sensor 105 in a bore 102 and to store it there. The bore 102 defines a radial direction and an axial direction perpendicular thereto, which runs along a longitudinal extension of the collet. According to exemplary embodiments, the sensor 105 is guided when it is inserted into the clamping sleeve in such a way that—in contrast to conventional clamping sleeves (see 5 ) - no non-zero tilt angle 510 can arise. The structural features that achieve this are described in detail below.

1B shows further details of the clamping sleeve according to exemplary embodiments. The clamping sleeve comprises a sleeve body 110 for receiving the sensor 105, the sleeve body 110 having at least one roughened area 120 with increased surface roughness on a surface 115. The surface 115 is a radially outer surface that faces the bore 102 after insertion of the ferrule so that the roughened area 120 enhances the retention of the ferrule with the sensor 105 in the bore 102 .

In the exemplary embodiment shown, the sleeve body 110 comprises a plurality of spring tongues 130 which each have a free end 132 and a fastening end 134 . The attachment end 134 attaches to the sleeve body 110 and the free end 132 is swingable against a spring force. When the clamping sleeve is at least partially in the bore 102 together with the sensor 105, the spring tongue 130 supports the sensor 105 against the bore 102 by exerting the spring force. The spring tongue 130 is curved so that the sensor 105 is mounted in a displaceable manner.

In addition, the sleeve body 110 includes stops 140 on an axial end of the clamping sleeve, which on the one hand prevent further insertion of the clamping sleeve into the bore 102 . On the other hand, the stops 140 can also offer an optional anti-twist protection. For example, the stops 140 may be received by a recess in the bore 102 such that the collet is not rotatable within the bore 102 after insertion.

2A 12 shows further exemplary embodiments for the roughened areas 120, which include, for example, a first roughened area 121 and a second roughened area. The first roughened area 121 extends, for example, along a continuous web in the axial direction. The second roughened portion 122 is formed along a circumferential direction of the sleeve body 110 .

In the embodiment shown, the first roughened area 121 comprises a herringbone shape (sequence of connected V-shapes) followed by a parallel shape (sequence of vertical || elements). The V-shapes can point in both directions (cf. e.g 1 B and 2A ) and connected to their tips (see 1B ) to form the herringbone pattern. This makes it more difficult for the clamping sleeve to twist after it has been inserted into the bore 102 .

The second roughened portion 122 may be circumferentially formed at a distal end (first inserted into the bore 102). Different forms can also be used here. In the 2A two parallel grooves are shown. However, other shapes can also be formed. Both the first roughened area 121 and the second roughened area can be formed by one or more of the following shapes: ribs, grooves (full or partially formed), fish tackle, barb, zigzag, V-shape, II-shape, ratchet- shape, zigzag shape.

2 B shows embodiments for the sleeve body 110 with a plurality of guide elements 112. The guide elements 112 extend radially inwards and are designed to prevent the sensor 105 from tilting when it is inserted into the To prevent collet or to give the sensor 105 a guide during insertion. The guide elements 112 form various support points or support rails which overcome the problem of the conventional clamping sleeves tilting.

In the embodiment shown, the guide members 112 include: barbs 113, an axially extending notch 114, one or more indentations 116, radially inwardly bent tabs 118 (not shown inwardly bent in the figure). The axially extending notch 114 is designed, for example, as a double profile with a guide strip and the barbs 113 and increases the static friction in the bore 102. It goes without saying that not all the shapes shown are present in other exemplary embodiments.

The impressions 116 can be formed locally at various positions and extend radially inward from the sleeve body 110 in order to provide support points for the sensor 105 used. The embossings 116 offer the advantage that the limited support points reduce the insertion force. According to exemplary embodiments, further barbs 113 can be formed on an edge region of the impressions 116, which support the holding of the sleeve body 110 in the bore 102.

The optional barbs 113 are designed, for example, in such a way that although they do not represent a great deal of resistance when the clamping sleeve is pushed into the bore 102 , they do make it more difficult for the clamping sleeve to be pushed out of the bore 102 .

The sleeve body 110 may include open areas 119 (e.g., cutouts) that may be formed to include tabs. According to exemplary embodiments, these tabs 118 will be bent or folded inwards to provide further guidance for the sensor 105 during installation.

The sleeve body 110 is formed, for example, as a C-shape with two opposing edges 125 (or edges), wherein at least one edge 125 of the ferrule can be bent circumferentially inward and then outward again to form the notch 114 and another guide to ensure when installing the sensor. This is described in more detail below.

3 12 shows a cross-sectional view through the sleeve body 110 with a sensor 105 arranged in the middle. The sleeve body 110 has a C-shape such that a gap 117 separates opposite edges 125 of the sleeve body 110 and extends axially. Along the edge 125, the notch 114 is formed in the 2 B was only shown schematically. Barbs 113 may be formed directly at the end of rim 125 (eg, by incomplete machining).

The notch 114 thus guides the sensor 105 when it is inserted into the clamping sleeve and prevents the sensor 105 from tilting, which is caused by the spring tongues 130, which press the sensor 105 radially inwards (in the 3 two spring tongues 130 are shown). Also shows the 3 the impressions 116, which also extend radially inwards, but cannot prevent tilting since they are only formed locally.

According to exemplary embodiments, the notch 114 is designed as a ridge, which in some cases can also be designed to be lower than the impressions 116 as support points. In particular, the web can be formed between the support points and the ends 125 of the C-shaped opening of the collet. According to further exemplary embodiments, it is also possible for a half S-shape to be formed at the end 125, i.e. the sleeve body 110 is bent several times and bent inwards again at the end.

Optionally, the end 125 can also project radially beyond the sleeve body 110 and engage in a groove in the bore 102 . This offers an additional anti-rotation device, which can be formed by the stops 140 in addition to or instead of an anti-rotation device. This is particularly advantageous for sensors 105 that must be inserted in a predetermined orientation in order to function correctly (which should not twist). These are, for example, sensors such as direction-dependent Hall elements, which are to be exposed according to their reading direction. For passive (non-directional) speed sensors, a standard ferrule with no engagement in a groove (the end of the ferrule body does not protrude beyond the radius) would be preferable.

Likewise, according to further exemplary embodiments, existing contours of the clamping sleeve can be bent in such a way that they support the optimal insertion axis in the axial direction of the sensor (such as the above-mentioned tabs 118).

• - Bereitstellen S110 eines Hülsenkörpers 110 zur Aufnahme des Sensors 105; und
• - Ausbilden S120 zumindest eines aufgerauten Bereiches 120 mit erhöhter Oberflächenrauheit auf einer Oberfläche 115 des Hülsenkörpers 110.

4 shows a schematic flow diagram for a method for producing the clamping sleeve according to exemplary embodiments. The procedure includes the steps:

• - Providing S110 a sleeve body 110 for receiving the sensor 105; and
• - Forming S120 of at least one roughened area 120 with increased surface roughness on a surface 115 of the sleeve body 110.

Before or after the forming step S120, the sleeve body 110 can also be reshaped S115 into a cylindrical shape. After the clamping sleeve has been inserted, the surface faces an inner wall of the bore 102 so that the at least one roughened area 120 ensures that the clamping sleeve is held together with the sensor 105 in the bore 102 .

Optionally, forming the at least one roughened area 120 can include at least one of the following steps: stamping, embossing, notching, scoring, incomplete machining.

The guide elements 112 can be formed by bending or folding over.

According to further exemplary embodiments, the guide elements 112 can also be designed as lever elements (e.g. the spring tongues 130) or support elements (e.g. the impressions 116) on the clamping sleeve in such a way that central guidance of the sensor 105 is achieved during installation in the clamping sleeve. However, as long as the lifting elements or support elements are only provided in a specific position, there is a risk that—as with conventional clamping sleeves—a certain tilting in the direction of the contact points 116 on the opposite side of the spring tongue 130 occurs when the sensor is pushed in. This complicates the installation of the sensor 105 in the hole 102 (see discussion of 5 ).

Exemplary embodiments avoid such tilting by the guide elements 112, which can be produced, for example, by folding over the (axial) clamping sleeve opening (see notch 114) or folding over an existing design element (e.g. a tab). As a result, further support elements or an axial web can be provided as a guide element 112 .

According to exemplary embodiments, the clamping sleeve is also prevented from being pushed out in that the spring tongue 130 of the clamping sleeve is formed counter to the insertion direction of the sleeve. In addition, a punching direction of the material can also be selected in such a way that the punching direction extends radially outwards and thus towards the contact surface of the bore 102 . In this way, it is possible for a microscopically small punching burr of the spring tongue 130 to engage in the conversion of the bore 102 and thus secure the clamping sleeve from being pushed out.

• Ausführungsbeispiele verringern die Installationskraft und maximieren gleichzeitig die Haftreibung in der Bohrung 102, was bei konventionellen Klemmhülse nicht erreichbar ist. Hierzu dienen die aufgerauten Bereiche 120 an verschiedenen Stellen des Hülsenkörpers 110. Weiterhin wird die Einführung durch Führungselemente (z.B. der Steg oder Einkerbung 114) erleichtert, da ein Verkippen des Sensors 105 beim Einführen zuverlässig verhindert wird.

Embodiments also offer the following advantages:

• Embodiments reduce the installation force while maximizing stiction in the bore 102, which is not achievable with conventional ferrules. The roughened areas 120 at various points of the sleeve body 110 serve for this purpose. Furthermore, the introduction is facilitated by guide elements (eg the web or notch 114), since tilting of the sensor 105 during introduction is reliably prevented.

• - die Federkonstante (maßgeblich für die Funktion),
• - ein Federlager (z.B. wenn die Federzunge beidseitig befestigt ist),
• - Verkippung des Sensors 105 und der damit verbundenen erhöhte Kraftaufwand.

With conventional ferrules, the following factors lead to the undesirable increase in force (see 5B ):

• - the spring constant (decisive for the function),
• - a spring bearing (e.g. if the spring tongue is attached on both sides),
• - Tilting of the sensor 105 and the associated increased effort.

Exemplary embodiments thus represent improvements that facilitate the installation of the sensor in the ferrule without having to redesign the spring constant or the spring bearing of the ferrule.

In addition to the function of easier installation of the sensor 105, reliable protection against twisting of the clamping sleeve can be achieved in a simple manner. For this purpose, the V-shape, which extends axially on an edge of the sleeve body 110, protrudes beyond the radius of the clamping sleeve and engages in a groove in the bore 102.

The features of the invention disclosed in the description, in the claims and in the figures can be essential for the implementation of the invention both individually and in any combination.

Reference List

102

drilling

105

sensor

110

sleeve body

112

guiding elements

113

barb

114

axially extending notch(s)

115

Surface of sleeve body (facing radially outward)

116

imprint(s)

117

gap

118

bent tab

119

open area

120,121,122

roughened area(s)

125

Edges in the circumferential direction, first anti-twist device

130

spring tongue(s)

132

free end(s)

134

attachment end(s)

140

Stop, second anti-twist device

501, 502

force peak(s)

503

power plateau

510

tilt angle

520

Conventional collet

522, 523

spring tongue(s)

524

bearing surfaces

F1, F2, F3, F4

insertion forces

S110, S115, S120

Process steps for the production of the clamping sleeve

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 3281019 B1 [0002]

Claims (11)

Clamping sleeve for receiving and mounting a sensor (105) in a bore (102), the bore (102) defining a radial and an axial direction, characterized by a sleeve body (110) for receiving the sensor (105), the sleeve body ( 110) has at least one roughened area (120) on a surface (115). collet after claim 1 , characterized in that the at least one roughened area (120) comprises one or more of the following shapes: a rib, a groove, a herringbone pattern, a barb, a ratchet shape, a zigzag shape, a V-shape, a II -shape or a combination thereof. Clamping sleeve according to one of the preceding claims, characterized in that the at least one roughened area (120) has a first roughened area (121) and a second roughened area (121), the first roughened area (121) extending in the axial direction along a continuous web extends and the second roughened areas (122) extends in a circumferential direction. Clamping sleeve according to one of the preceding claims, characterized in that the sleeve body (110) has a plurality of guide elements (112) which extend radially inwards and are designed to prevent the sensor (105) from tilting when it is inserted into the clamping sleeve. collet after claim 4 characterized in that the guide elements (112) comprise one or more of the following: an axially extending indentation (114), an indentation (116), a radially inwardly bent tab (118). collet after claim 4 or claim 5 , characterized in that the guide elements (112) have barbs (113), the barbs (113) extending radially outwardly to block withdrawal of the collet from the bore (102). Clamping sleeve according to one of the preceding claims, wherein the bore (102) has an axially extending groove and the sleeve body (110) has a C-shape in a cross section perpendicular to the axial direction, so that opposite edge regions (125) of the sleeve body (110) have a form an axial gap (117), characterized in that the sleeve body (110) in the edge region (125) is bent inwards in the circumferential direction and then outwards in order to form a radial projection and thus engage in the groove and provide anti-twist protection . Clamping sleeve according to one of the preceding claims, characterized in that the sleeve body (110) has at least one spring tongue (130) which has a free end (132) and a fastening end (134), the fastening end (134) being attached to the sleeve body (110 ) is fixed and the free end (132) can be oscillated against a spring force, so that the spring tongue (130) supports and displaceably supports the sensor (105) against the bore (102) when the spring force is exerted when the clamping sleeve moves together with the Sensor (105) is at least partially in the bore (102). collet after claim 8 , characterized in that the sleeve body (110) has at least one stamping burr, which after the insertion of the sleeve body (110) into the bore (102) extends radially inwards or outwards from a bore surface. A method of manufacturing a collet insertable into a bore (102), the bore (102) defining a radial direction and an axial direction, characterized by providing (S110) a collet body (110); Reshaping (S115) of the sleeve body (110) into a cylindrical shape for receiving and supporting the sensor (105) in the bore (102); and forming (S130) at least one roughened area (120) on a surface (115) of the sleeve body (110) to ensure retention of the collet together with the sensor (105) in the bore (102). procedure after claim 10 , characterized in that the formation of the at least one roughened area (120) comprises at least one of the following steps: stamping, embossing, notching, scoring, incomplete machining.

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