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CN-121994286-A - Sensor and method for mounting a sensor unit in a sensor housing of such a sensor

CN121994286ACN 121994286 ACN121994286 ACN 121994286ACN-121994286-A

Abstract

In a sensor having a tubular sensor housing (100) and having a sensor unit (200) fastenable in the interior of the sensor housing (100), the sensor unit (200) is fastenable in the sensor housing (100) axially immovably by means of a clasp (400), which is positionable on a sensor package (210), and which finally rests in a clasp receptacle produced between the sensor package (210) and the sensor housing (100) when the sensor unit (200) is mounted in the sensor housing (100).

Inventors

  • Antal Jan Ullrich

Assignees

  • 巴鲁夫公司

Dates

Publication Date
20260508
Application Date
20251105
Priority Date
20241105

Claims (12)

  1. 1. A sensor having a tubular sensor housing (100) and having a sensor unit (200) which can be fastened in the interior of the sensor housing (100), characterized in that, The sensor unit (200) is axially immovably fastenable in the sensor housing (100) by means of a clasp (400), which is positionable on a sensor package (210), and which finally rests in a clasp receptacle generated between the sensor package (210) and the sensor housing (100) when the sensor unit (200) is mounted in the sensor housing (100).
  2. 2. The sensor according to claim 1, characterized in that the sensor is sealed by means of an O-ring (300) which finally rests in an O-ring receptacle generated between the sensor package (210) of the sensor unit (200) and the sensor housing (100) when the sensor unit (200) is mounted in the sensor housing (100).
  3. 3. The sensor according to claim 1 or 2, characterized in that the sensor housing (100) has an edge (130) protruding radially inwards, and in that the sensor package (210) of the sensor unit (200) has a step (230) protruding radially outwards, such that when the sensor unit (200) is mounted in the sensor housing (100), the edge (130) and the step (230) are spaced apart in a predefinable manner in a radial direction of the sensor housing (100), and thereby an annular circumferential cavity forming the O-ring receptacle is created.
  4. 4. A sensor according to claim 3, characterized in that the spacing between the edge (130) and the step (230) is predefined according to the material properties, in particular the elasticity, of the O-ring (300).
  5. 5. The sensor of claim 1, wherein the sensor housing (100) has an annular circumferential first groove (140) at a predefined location in the inner wall, and wherein the sensor package (210) of the sensor unit (200) has an annular circumferential second groove (240) positioned such that the first groove (140) opposes the second groove (240) when the sensor unit (200) is mounted in the sensor housing (100), and the annular circumferential cavity thus created forms the clasp receptacle.
  6. 6. The sensor according to claim 1, characterized in that the snap ring (400) has a frustoconical chamfer (410, 420) in and/or against the pushing direction (R), wherein the axis of the at least one frustoconical chamfer (410, 420) coincides with the axis of the sensor housing (100).
  7. 7. The sensor according to one of the preceding claims, characterized in that the retaining ring (400) is composed of plastic or metal.
  8. 8. The sensor according to one of the preceding claims, characterized in that the sensor package (210) has a truncated cone chamfer (250) pointing towards the interior of the sensor housing (100) in the pushing direction (R), wherein an axis of the truncated cone chamfer (250) coincides with the axis of the sensor housing (100).
  9. 9. The sensor according to one of the preceding claims, characterized in that the sensor housing (100) has a chamfer (150) on its end face opening.
  10. 10. Method for mounting a sensor unit (200) in a sensor housing (100) of a sensor according to one of claims 1 to 9, characterized by the following steps: -mounting a grommet (400) in the annular circumferential second groove of the sensor package (210); -pushing the sensor unit (200) into the interior of the tubular sensor housing (100) until the clasp (400) expands into the annular circumferential first groove (140) in the inner wall of the sensor housing (100).
  11. 11. Method for mounting a sensor unit (200) in a sensor housing (100) of a sensor according to one of claims 1 to 9, characterized by the following steps: -mounting a grommet (400) in the annular circumferential first groove in the inner wall of the sensor housing (100); -pushing the sensor unit (200) into the interior of the tubular sensor housing (100) until finally resting in the annular circumferential second groove of the sensor package (210).
  12. 12. The method according to claim 10 or 11, characterized in that the O-ring is mounted on the outwardly protruding step of the sensor package (210) before or after mounting the grommet (400) in the annular circumferential second groove of the sensor package (210) or in the annular circumferential first groove in the inner wall of the sensor housing (100), such that the O-ring is deformed to create a seal when the sensor unit (200) is pushed into the sensor housing (100), and finally rests in the O-ring receptacle created between the sensor package (210) and the sensor housing (100) after the grommet (400) has been positioned in the grommet receptacle.

Description

Sensor and method for mounting a sensor unit in a sensor housing of such a sensor Technical Field The invention relates to a sensor of the type as claimed in claim 1. The subject of the invention is also a method for mounting a sensor unit in a sensor housing of such a sensor. Background Modern sensors and in particular microsensors have electronic circuits for evaluating sensor signals, setting sensor parameters, etc. The electronic circuit and the actual sensor element are very often arranged in a very small, usually cylindrical housing. These housings often have external threads so that they can be mounted like screws in machine parts, housings, etc. With the known sensor, the electronic circuit and the sensor element, which is usually embedded in a sensor package, for example of a thermosetting material, are fastened in the interior of the tubular housing, for example by means of adhesive bonding or by means of a suitable flange. However, adhesives or fillers, such as resins, foams, etc., are often dangerous, not very environmentally friendly or even toxic materials. Furthermore, they are difficult to handle, especially when transportation, storage, filling, curing time/temperature etc. are involved. Another fastening option known from the prior art is flanging. However, this requires special tools, flanging punches, presses, etc. Furthermore, tubular sensor housings are susceptible to damage under this type of fastening method. A sensor known from the prior art is for example found in DE 20 2013 007 756 U1. The present invention solves the problem of overcoming the aforementioned drawbacks and of providing a sensor that is easy to install quickly and also resistant to external influences and in particular waterproof. Disclosure of Invention The sensor according to the invention has the advantage of being easy and quick to install, while being resistant to external environmental influences and in particular effectively preventing water from entering the interior of the sensor housing. For this purpose, it is proposed according to the invention that the sensor unit can be secured in the sensor housing in an axially fixed manner by means of a snap ring which can be positioned on the sensor element and which, when the sensor unit is installed in the sensor housing, finally rests in a snap ring receptacle produced between the sensor unit and the sensor housing. This fastening method allows for very quick and at the same time accurate installation. According to an advantageous aspect of the invention, it is proposed that the sensor is sealed by means of an O-ring which finally rests in an O-ring receptacle created between the sensor package of the sensor unit and the sensor housing when the sensor unit is mounted in the sensor housing. Thereby, the entire sensor is sealed. The sensor element is embedded in the sensor package and is thus protected from external influences. Due to the O-ring between the sensor package, the sensor unit and the sensor housing, the ingress of substances, in particular water, into the interior of the sensor housing is effectively prevented. In order that the mounting of the O-ring to produce the sealing described above can be carried out simultaneously with the mounting of the sensor unit in the sensor housing, a very advantageous aspect of the invention proposes that the sensor housing has a radially inwardly protruding rim and that the sensor package of the sensor unit has a radially outwardly protruding step, so that when the sensor unit is mounted in the sensor housing the rim and the step can be spaced apart in a predefinable manner in the radial direction of the sensor housing and thereby produce an annular circumferential cavity forming the O-ring receptacle. The rim and the step position the O-ring in the O-ring receptacle during mounting of the sensor unit to the sensor housing by means of a snap ring, as will be described in more detail below. In this case, it is particularly advantageous to provide that the distance between the edge and the step can be predefined on the basis of the material properties of the O-ring, in particular the elasticity. The O-ring serves a dual function. Which is responsible for the watertight sealing of the connection and also provides the connection with an elastic pre-tension. In this case, the O-ring receptacle is configured such that the O-ring is compressed at least in the axial direction, i.e. parallel to the axis of the tubular sensor housing or in both the axial and radial directions. An advantageous aspect of the invention proposes that the sensor housing has an annular circumferential first groove at a predefined position in its inner wall and that the sensor package of the sensor unit has an annular circumferential second groove, which second groove is positioned such that the first groove is opposite the second groove when the sensor unit is mounted in the sensor housing, and that the annular circumferential cavity thus produced f