Search

DE-102025109293-B3 - Expansion tank for a motor vehicle fluid circuit

DE102025109293B3DE 102025109293 B3DE102025109293 B3DE 102025109293B3DE-102025109293-B3

Abstract

The invention relates to an expansion tank (1) for a fluid circuit of a motor vehicle, comprising a tank wall (2) enclosing an interior (3) of the expansion tank (1) and a filling opening (4) provided in the tank wall (2) and closable with a lid (5) for filling the expansion tank (1) with a fluid, wherein the filling opening (4) is located on a filling nozzle (6) extending from a base body (7) of the expansion tank (1). The provision includes a filling nozzle (6) having a longitudinal center axis and circumferentially encompassing a screw collar (8) with respect to the longitudinal center axis, the screw collar having a thread (9) on its side facing the filling nozzle (6) in a radial direction with respect to the longitudinal center axis for interaction with a mating thread (19) of the cover (5), wherein a locking pin (14) is displaceably mounted on a side of the screw collar (8) facing away from the filling nozzle (6) in a radial direction with respect to the longitudinal center axis, the locking pin being arranged at a distance from the cover (5) in a release position and engaging the cover (5) in a form-fitting manner in a locking position other than the release position and securing it circumferentially.

Inventors

  • Peter Arndt
  • JENS BRAND

Assignees

  • AUDI AKTIENGESELLSCHAFT

Dates

Publication Date
20260513
Application Date
20250311

Claims (10)

  1. Expansion tank (1) for a fluid circuit of a motor vehicle, comprising a tank wall (2) enclosing an interior (3) of the expansion tank (1) and a filling opening (4) formed in the tank wall (2) and closable with a cover (5) for filling the expansion tank (1) with a fluid, wherein the filling opening (4) is located on a filling nozzle (6) extending from a base body (7) of the expansion tank (1), characterized in that the filling nozzle (6) has a longitudinal central axis and is circumferentially encompassed with respect to the longitudinal central axis by a screw collar (8), which has on its side facing the filling nozzle (6) in a radial direction with respect to the longitudinal central axis a thread (9) for interacting with a mating thread (19) of the cover (5), wherein on a side of the screw collar (8) facing away from the filling nozzle (6) in a radial direction with respect to the longitudinal central axis a locking pin (14) is displaceably mounted, is arranged at a distance from the cover (5) in a release position and engages the cover (5) in a form-fitting manner in a locking position different from the release position and secures it in the circumferential direction.
  2. Expansion tank after Claim 1 , characterized in that the locking pin (14) is arranged in an annular recess (12) which is arranged in a radial direction with respect to the longitudinal center axis between the screw collar (8) and a support collar (10), wherein the support collar (10) surrounds the screw collar (8) in a circumferential direction with respect to the longitudinal center axis.
  3. Expansion tank according to one of the preceding claims, characterized in that the lid (5) has two annular webs (22, 23), of which, when the lid (5) is arranged as intended, a first annular web is arranged adjacent to the screw collar (8) when viewed in the radial direction with respect to the longitudinal center axis, and a second annular web is in overlap with the support collar (10), wherein a locking device of the lid (5) which interacts positively with the locking pin (14) in its locking position is arranged in the radial direction with respect to the longitudinal center axis between the annular webs (22, 23).
  4. Expansion tank according to one of the preceding claims, characterized in that the locking pin (14) is displaceably mounted in an insert part (16) inserted into a recess of the base body (7).
  5. Expansion tank after Claim 4 , characterized in that the insert part (16) has a guide projection (15) provided and designed for the movable bearing of the locking pin (14), which extends through the recess of the base body (7) and extends through the annular recess (12) in axial direction with respect to the longitudinal center axis to at least 50%, at least 75% or at least 90%.
  6. Expansion tank after Claim 4 or 5 , characterized in that a guide chamber (24) is provided in the insert part (16), in which a piston (25) connected to the locking pin (14) in an axial direction The tung is arranged in a way that allows it to be moved relative to the longitudinal center axis.
  7. Expansion tank after Claim 6 , characterized in that the guide chamber (24) is fluidically connected on the one hand to the interior (3) of the expansion tank (1) of the piston (25) and on the other hand to an external environment of the expansion tank (1).
  8. Expansion tank after Claim 7 , characterized in that the insert part (16) projects into the interior (3) of the expansion vessel (1), wherein the guide chamber (24) is closed with a bottom wall attached to the insert part (16) and is fluidically connected to the interior (3) via a pressure equalization opening (26) provided in the bottom wall.
  9. Expansion tank according to one of the preceding claims, characterized in that the locking pin (14) is subjected to a spring force by means of a spring element which pushes the locking pin (14) in the direction of the release position, or that the locking pin (14) is pushed in the direction of the release position exclusively by a weight force acting on it.
  10. Expansion tank after one of the Claims 6 until 8 , characterized in that a wall defining the guide chamber (24) and/or the piston (25) and/or the locking pin (14) are provided with a sliding coating.

Description

The invention relates to an expansion tank for a fluid circuit of a motor vehicle, comprising a tank wall enclosing an interior of the expansion tank and a filling opening formed in the tank wall and closable with a lid for filling the expansion tank with a fluid, wherein the filling opening is located on a filling nozzle extending from a base body of the expansion tank. For example, printed matter is state of the art. DE 102 46 590 A1 This is known. It describes a container with an opening, a lid for closing the opening, and at least one locking device for preventing the lid from opening in the event of overpressure inside the container. The locking device is designed to lock the lid by means of a positive fit. For this purpose, the locking device has at least one slidably mounted locking pin located on the container, which can be inserted into a recess in the lid. The locking pin can be moved into a locked position by means of a piston/cylinder unit and into a released position by means of spring force, with the actuation of the clamping device being controlled by the pressure present inside the container. Specifically, it is provided that the lid can be screwed, in particular screwed, onto a nozzle having an opening, and has a closing element that projects into the nozzle when screwed on, the recess being provided on the circumference of the closing element or extending in the direction of the longitudinal extent of the nozzle. Furthermore, the printed text reveals DE 101 64 669 A1 A screw-on locking device for a cap that can be fitted or is fitted onto a stationary nozzle of a container, in particular a motor vehicle radiator, comprising an outer cap part with a handle element and a locking element connectable to a counter-locking element of the nozzle, and an inner cap part with a valve arrangement preferably configured as a positive/negative pressure combination, wherein an anti-rotation device acts between the outer cap part and the nozzle. It is provided that the anti-rotation device can be actuated by means of a drive controlled by the operating data in the container or by a motor, which is housed in a casing located inside or outside the container near the outer cap part. The printed matter JP S62 - 159 721 A This concerns a cap for a motor vehicle radiator, designed to remove and seal a fluid filler opening located at the top of a radiator. To prevent scalding from splashes of hot coolant, a locking mechanism is proposed that engages when the cap reaches high temperatures. Printed materials are still state-of-the-art. US 3 587 912 A , US 2005 / 0 211 709 A1 and WO 2005 / 073 532 A1 known. The object of the invention is to propose an expansion tank for a fluid circuit of a motor vehicle which has advantages over known expansion tanks, in particular enabling particularly safe handling by a user of the motor vehicle. This is achieved according to the invention with a reservoir for a fluid circuit of a motor vehicle with the features of claim 1. It is provided that the filling nozzle has a longitudinal center axis and is circumferentially encompassed with respect to the longitudinal center axis by a screw collar, which has a thread on its side facing the filling nozzle in the radial direction with respect to the longitudinal center axis for interaction with a mating thread of the lid, wherein a locking pin is displaceably mounted on a side of the screw collar facing away from the filling nozzle in the radial direction with respect to the longitudinal center axis, which is arranged at a distance from the lid in a release position and engages the lid in a form-fitting manner in a locking position other than the release position and secures it in the circumferential direction. Advantageous embodiments with expedient further developments of the invention are specified in the dependent claims. It should be noted that the exemplary embodiments described in the description are not limiting; rather, any variations of the features disclosed in the description, the claims, and the figures are possible. The expansion tank is preferably part of the vehicle's fluid circuit, but can of course also be separate from it, particularly until the expansion tank is installed in or on the fluid circuit and/or the vehicle. The fluid circuit is, for example, a coolant circuit in which the fluid, at least temporarily, is used in the form of a coolant to regulate the temperature of a vehicle. The coolant is circulated in a temperature-controlled device. In addition to the expansion tank, the coolant circuit therefore includes at least the device to be temperature-controlled, but preferably also a coolant radiator and a coolant pump. The coolant radiator serves to cool the coolant, and the coolant pump serves to circulate the coolant. For example, the coolant is supplied by the coolant pump to the device to be temperature-controlled, where the coolant absorbs heat. The coolant is then fed into the coolant radiator, where it re