DE102011120259A1 - Rotary valve for refrigerant circuit of combustion engine, has rotary gear box which comprises driven worm having two threads, by which rotor is axially displaceable to adjustment links coupled with rotor in rotatable state - Google Patents

Abstract

The rotary valve (1) has several cross-section adjustment links (2) and a rotary gear box. The rotational angle difference is produced between the cross-section adjustment links. The rotary gear box comprises a driven worm (5) having two threads (11,12), by which the rotor (3) is axially displaceable to a cross section adjustment links that is coupled with the rotor in the rotatable state. The rotor comprises a fixed pin (7) which engages with one of the two threads.

Description

The invention relates to a rotary valve, in particular for a multi-branched coolant circuit of an internal combustion engine, with a plurality of Querschnittsverstellgliedern and a rotation angle difference between the Querschnittsverstellgliedern generating rotary gear.

Rotary valves have Querschnittsverstellglieder in order to set different flow cross sections for different branches of a coolant circuit. For adjusting a volume flow of a liquid or gaseous medium, rotary valves usually have at least one flow opening in the lateral surface of a cross-section adjustment member. Depending on the angular position of the cross-section adjustment is obtained by the interaction with an inlet or a flow for the medium, a flow cross-section whose size is variable. Coolant circuits of internal combustion engines often have a plurality of branches, but the use of one adjustment element per branch requires a large installation space and is expensive.

In the WO 2008/049624 A2 a generic rotary valve is proposed. The rotary valve has a plurality of Querschnittsverstellglieder, which can open or close a flow cross-section individually. For this purpose, the rotary valve on a rotary gear to produce a rotation angle difference between individual Querschnittsverstellgliedern. For example, in two Querschnittsverstellgliedern, each driven by a rotary member, the first is rotated twice as far as the second. As a result, a flow cross-section can be released and another flow cross-section can be partially or completely closed. Although this rotary valve has proven itself in practice, it has the disadvantage that only a rotary valve can be controlled while other rotary valves can only be moved between an open and a closed state, these can thus only be switched.

The invention is therefore based on the object to provide a rotary valve in which a plurality of Querschnittsverstellglieder are continuously adjustable and can be adjusted and adjusted as often in both directions of rotation.

To solve this problem is provided according to the invention in a rotary valve of the type mentioned that the rotary gear has a drivable screw with two threads, by means of which a rotor is axially displaceable to a Querschnittsverstellglied which is rotatable in a state coupled to the rotor.

With the rotary valve according to the invention an angular exact control of any number of Querschnittsverstellglieder is possible with only a single servomotor. The regulation or adjustment of the Querschnittsverstellglieder can be done in both directions and as often. The invention is based on the finding that the worm is rotated by means of a motor, whereby the rotor anfährt a certain Querschnittsverstellglied, with the aid of a labyrinth in the worm, the Querschnittsverstellglied can be adjusted as often and in both directions.

A particularly high reliability in the adjustment results when the rotor has a fixed pin which engages in one of the two threads. In this state, the rotor is coupled to the worm, so that the rotor can be moved axially.

The rotary valve according to the invention can have any number of Querschnittsverstellglieder axially follow one another, so that a runner by means of the screw approach a certain Querschnittsverstellglied and can rotate.

Preferably, the screw of the rotary valve according to the invention may have a first, having interruptions, an axial movement of the rotor enabling thread. The first thread thus serves to guide the rotor during an axial movement. The rotor is moved axially to approach a particular Querschnittsverstellglied, which can then be adjusted.

In the rotary valve according to the invention, it may further be provided that the screw has a second, a reverse movement of the rotor enabling thread. Thus, the second thread serves to return the runner to a starting point.

According to one embodiment of the invention, it may be provided that the rotary valve comprises a housing with an internal toothing, through which the rotor is guided during an axial movement. If the rotor is moved axially by a rotational movement of the worm, it engages in the internal toothing of the housing, so that co-rotation of the rotor is prevented.

A particularly reliable function results in the rotary valve according to the invention, when the rotor has projections on its outer side, which engage in the internal toothing of the housing. However, the projections may be distributed over the outer circumference of the rotor and are adapted in terms of their shape and size to the internal toothing of the housing.

It is also within the scope of the invention if the at least one Querschnittsverstellglied has internal teeth, in which the rotor engages in an adjustment process. It is expedient that the internal toothing of the cross section adjustment member is designed like an internal toothing of the housing. Accordingly, the rotor engages with its outer projections in an axial adjustment in the internal toothing of the housing, when he has reached a desired, to be adjusted Querschnittsverstellglied, engages the rotor with its outside projections in the internal teeth of the approach Querschnittsverstellglieds, so that this be adjusted can to adjust a flow cross section.

In the rotary valve according to the invention, it can also be provided that a thread of the screw has spring-loaded flaps, which allow movement of the pin in one direction and lock in the opposite direction.

Further advantages and details of the invention will be explained below with reference to an embodiment with reference to the drawings. The drawings are schematic representations and show:

1 the essential components of a rotary valve according to the invention in a perspective or sectional view;

2 a screw of the rotary valve according to the invention;

3 a section of the screw on an enlarged scale,

4 the snail and the runner in a perspective view;

5 - 7 start-up and selection of a cross-section adjustment member;

8th + 9 the twisting of a selected cross section adjustment member;

10 + 11 the extension of the pen from the labyrinth; and

12 the rotary valve in a cut view.

1 shows an embodiment of a rotary valve with its essential components. In 1 is the rotary valve 1 In addition, essential components around him are grouped (not to scale) shown in a sectional view. These are Querschnittsverstellglieder 2 , a runner 3 and a housing 4 ,

The rotary valve 1 includes a slug shown cut 5 , which at one end is a wave 6 which can be rotated by an electric motor (not shown) in both directions.

The runner 3 is substantially annular and has on its inside a pin 7 on, in a thread of the slug 5 can intervene. On its outside is the runner 3 with projections 8th provided in an annular toothing 9 on the inside of the case 4 or an annular toothing 10 on the inside of a Querschnittsverstellglieds 2 can intervene. In the illustrated embodiment are within the housing 4 three cross section adjustment members 2 provided axially one behind the other, in principle, however, a rotary valve can have any number of Querschnittsverstellglieder.

If the projections 8th of the runner 3 in engagement with the toothing 9 of the housing 4 are, can the runner 3 whose pen 7 in a thread of the screw 5 engages, by a rotation of the screw 5 axially with respect to the housing 4 to be moved. If the projections 8th of the runner 3 in engagement with the toothing 10 a Querschnittsverstellglieds, the Querschnittsverstellglied 2 by a rotation of the screw 5 by means of the runner 3 to be twisted.

The runner 3 can be axial along the screw 5 to be moved. The "screwing up" by means of a thread of the screw 5 works because of the runner 3 in the teeth 9 in the case 4 is guided. The projections 8th are on the outside of the runner 3 distributed over the circumference and engage in the gearing 10 a Querschnittsverstellglieds and produce a necessary for the rotation positive fit.

2 shows the snail 5 that a first thread 11 and a second thread 12 having. The first thread 11 is for the axial movement of the rotor 3 during the selection of a cross section adjustment member 2 or during the rotation of the selected cross-section adjustment member 2 responsible. This first thread 11 is interrupted at certain points where there is a Querschnittsverstellglied 2 located.

During the adjustment process is the pin 7 of the runner 3 in the first thread 11 , In the 2 shown breaks and steps in the thread 11 allow a rotation of a selected Querschnittsverstellglieds, it is essential that a rotation of a Querschnittsverstellglieds 2 and one with it Control or regulation of a flow cross section in both directions and can be made as often as desired.

The second thread 12 is continuous and is used for the return of the runner 3 needed to the starting point. If the runner 3 at the end of the snail 5 arrived, the pin can 7 of the runner 3 in the second thread 12 transferred and in this second thread 12 to be driven back to the starting point. Accordingly, the second thread 12 no interruptions or the like.

3 shows a section of the snail 5 on an enlarged scale. The first thread 11 the snail 5 has a first flap 13 and a second flap 14 on, each springy on the worm 5 are stored. The two arrows 15 . 16 give the direction of rotation of the flaps 13 . 14 at.

When the pen 7 in the first thread 11 located and the snail 5 is rotated, the pen moves 7 of the runner 3 in the first thread 11 , If the pen 7 against the first flap 13 it will open, leaving the pen 7 continue in the first thread 11 can be moved. The trajectory of the pen 7 is a combination of an axial movement and a movement in the circumferential direction of the screw 5 , As the movement continues, the pen hits 7 against the second flap 14 , this also works spring loaded and leaves the pen 7 happen.

4 shows the snail and the runner in a perspective view. In the illustrated state, the pin is located 7 of the runner 3 in the first thread 11 the snail 5 , at the same time is the runner 3 by means of its projections 8th on the outside in engagement with a Querschnittsverstellglied (not shown). The projections 8th of the runner 3 are in the toothing 10 the corresponding Querschnittsverstellglieds 2 retracted, so that a positive connection is present. In this state, the corresponding Querschnittsverstellglied 2 to be twisted.

In 5 is the start-up and selection of a Querschnittsverstellglieds 2 shown. For clarity, the annular rotor is not shown, only the pin 7 is in 5 shown. The pencil 7 is in the first thread 11 and is moved axially when the worm 5 is rotated by the electric motor. By the movement of the pen 7 will shut up 13 open.

6 is a similar representation of a section of the snail 5 with the first flap 13 and the second flap 14 , A double arrow 17 indicates the area in which the pen 7 of the runner 3 must be moved to select the direction of rotation. It is essential that a selected Querschnittsverstellglied 2 can be rotated arbitrarily far and thus adjusted. A Querschnittsverstellglied can also be rotated several turns in both directions.

7 is a similar representation as 6 , in addition to the runner 3 is shown. An arrow 18 indicates the direction of rotation of the screw 5 at. If the snail 5 twisted in this direction, the pin touches 7 the closed flap 13 in the first thread 11 the snail 5 , The flap 13 can not be opened in this direction, accordingly, the runner 3 rotated, thereby simultaneously the Querschnittsverstellglied 2 is turned.

8th shows the twisting of the selected cross section adjustment member 2 in the other direction. If the snail 5 now in the by an arrow 19 reversed direction is turned on, the pin hits 7 of the runner 3 on the closed second flap 14 which simply folds back in this direction of rotation. The pushed back second flap 14 causes the pen 7 in the in 8th shown position of the first thread 11 leads, in this end section can be the pen 7 do not move, accordingly, the runner 3 and thus the selected cross-section adjustment member 2 twisted. The second flap 14 closes in the illustrated direction of rotation of the worm thus the output for the pen 7 and makes a required wall in this area, which is the pen 7 leads.

In 9 is by a double arrow 20 shown that the runner 3 and thus the selected cross-section adjustment member 2 can be controlled as often as required in both directions of rotation. If the pen 7 on the second flap 14 meets, it is opened, accordingly, the corresponding Querschnittsverstellglied 2 to be twisted.

10 shows the extension of the pin from the labyrinth of the first thread and the continuation of the runner. If the snail 5 in the direction of the arrow 18 is turned, the pin hits 7 of the runner 3 the second door 14 , At this point, the rotation of the worm 5 stopped by the electric motor.

11 shows the extension of the pen from the labyrinth and the continuation of the runner. So that another Querschnittsverstellglied can be selected for an adjustment, the pin 7 from the labyrinth of the first thread 11 exit.

If the snail 5 through the electric motor into the other, through the arrow 19 specified Direction is turned, the pin can 7 of the runner 3 extend out of the labyrinth, now takes the first thread 11 and is moved axially.

12 shows the rotary valve 1 in a cut view. The snail 5 is by an electric motor 20 driven. The return of the runner is done by the pin 7 in the second thread 12 convicted and "screwed down" in this. The runner 3 who in 12 is not shown for reasons of clarity, is located either with a toothing 10 in a Querschnittsverstellglied or a toothing 9 in the case 4 engaged. When the pen 7 in the "wave-shaped" area of the first thread 11 is located, the runner leads 3 a lifting movement. The gearing 10 a Querschnittsverstellglieds 2 must therefore be designed so that the runner 3 always in mesh with the teeth 10 is, so that an adjustment in the circumferential direction can take place.

The rotary valve described has the advantage that any number of Querschnittsverstellglieder can be controlled, each Querschnittsverstellglied can be controlled in both directions. Each Querschnittsverstellglied is as often rotated in both directions, it remains in the respective labyrinth until it is extended by a scheme. All Querschnittsverstellglieder can be driven by a single electric motor, this only has to apply the moment for adjusting a single Querschnittsverstellglieds. The rotary valve described requires only a single water seal against the electric motor and is characterized by a simple assembly. The individual Querschnittsverstellglieder are the same parts.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• WO 2008/049624 A2 [0003]

Claims (8)

Rotary valve, in particular for a multi-branched coolant circuit of an internal combustion engine, with a plurality of cross-section adjustment members and a rotation angle difference between the Querschnittsverstellgliedern generating rotary gear, characterized in that the rotary gear a drivable screw ( 5 ) with two threads ( 11 . 12 ), by means of which a runner ( 3 ) axially to a Querschnittsverstellglied ( 2 ) is displaceable in one with the runner ( 3 ) Coupled state is rotatable. Rotary valve according to claim 1, characterized in that the rotor ( 3 ) a fixed pin ( 7 ), in one of the two threads ( 11 . 12 ) intervenes. Rotary valve according to claim 1 or 2, characterized in that the screw ( 5 ) has a first interruptions, an axial movement of the rotor ( 3 ) enabling thread ( 11 ) having. Rotary slide according to one of the preceding claims, characterized in that the screw ( 5 ) a second, a reverse movement of the rotor enabling thread ( 12 ) having. Rotary valve according to one of the preceding claims, characterized in that it comprises a housing ( 4 ) with an internal toothing ( 9 ), by which the runner ( 3 ) is guided during an axial movement. Rotary valve according to claim 5, characterized in that the rotor ( 3 ) on its outside projections ( 8th ), which in the internal toothing ( 9 ) of the housing ( 4 ) intervene. Rotary slide according to claim 6, characterized in that the Querschnittsverstellglied ( 2 ) an internal toothing ( 10 ) into which the runner ( 3 ) engages in an adjustment process. Rotary slide according to one of claims 2 to 5, characterized in that a thread ( 11 ) of the snail ( 5 ) spring-loaded flaps ( 13 . 14 ), which movement of the pen ( 7 ) in one direction and lock in the opposite direction.

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