Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K5/00—Casings, cabinets or drawers for electric apparatus
  • H05K5/06—Hermetically-sealed casings
  • H05K5/063—Hermetically-sealed casings sealed by a labyrinth structure provided at the joining parts
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T74/00—Machine element or mechanism
  • Y10T74/21—Elements
  • Y10T74/2186—Gear casings

Definitions

• the invention relates to a housing according to the type of the main claim.
• a housing according to the type of the main claim.
• it can happen that due to the different coefficient of thermal expansion and temperature changes, a gap is formed between the two housing parts, through which moisture penetrates into the cavity. If there are electrical devices in it, for example, this can lead to malfunctions.
• the housing according to the invention with the characterizing features of the main claim has the advantage that the housing cavity is always properly sealed to the outside, so that no malfunctions occur due to the penetration of liquid.
• the housing 10 according to FIG. 1 consists of a hollow-cylindrical inner housing part 11 and a hollow-cylindrical outer housing part 12 that surrounds it, which together form a cavity 13, which does not show devices.
• the inner housing part 11 consists of a relatively hard material such as metal, ceramic or a very hard plastic, the outer housing part made of a much softer material, eg. B. Thermoplastic. As a result of this selection of materials, both parts have a very different thermal expansion coefficient.
• the housing outer part 12 is produced, for example, by injection molding.
• the former expands more than the housing inner part 11 when heated in its longitudinal direction.
• the annular beads 16, 17 also expand more in the axial direction than the annular grooves 14, 15.
• the annular beads brace against the annular grooves in such a way that a practically hermetic seal of the cavity 13 is formed towards the outside. Moisture cannot therefore penetrate into the cavity 13 from the outside.
• the outer housing part from the harder material with the lower thermal expansion and instead the inner housing part 11 from the softer material with the higher thermal expansion coefficient.
• the effect is basically the same.
• the exemplary embodiment according to FIG. 2 differs from that according to FIG. 1 only in that an annular groove 20 is in turn formed on the inner housing part 11 A near one end face, an annular bead 21 near the other end face, while an annular bead on the outer housing part 12A on one side 22, on the other side an annular groove 23 is formed, with the annular bead and the annular groove interlocking again.
• the materials are again the same as described above, so that, in principle, the same sealing effect again results for the ring grooves or ring beads due to different thermal expansion of the two materials.
• the cross sections of the ring grooves and ring beads are again rectangular.
• two ring grooves which are close to one another and not designated further, are formed near the end face and on the outer circumference of the inner housing part 113, two annular beads on the inner circumference of the outer housing part 123, which again fit into the annular grooves. Ring beads and ring grooves in turn have a rectangular or square cross section as in the previous exemplary embodiments.
• the effect is increased as in the previously described embodiments.

Landscapes

• Engineering & Computer Science (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Casings For Electric Apparatus (AREA)
• Connection Of Plates (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6261490

Family Applications (1)

Country Status (5)

Families Citing this family (15)

Citations (4)

Family Cites Families (8)

• 1985
  • 1985-02-02 DE DE19853503558 patent/DE3503558A1/de not_active Withdrawn
• 1986
  • 1986-01-22 JP JP61500803A patent/JPS62501599A/ja active Granted
  • 1986-01-22 EP EP86900739A patent/EP0211019B1/de not_active Expired
  • 1986-01-22 WO PCT/DE1986/000019 patent/WO1986004768A1/de not_active Ceased
  • 1986-01-22 DE DE8686900739T patent/DE3662740D1/de not_active Expired
• 1988
  • 1988-01-12 US US07/143,446 patent/US4788885A/en not_active Expired - Lifetime

Patent Citations (4)

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