DE2019131A1 - thermostat - Google Patents

Description

DlPL-INQ. DIETER JANDER DR.-INQ. MANFRED BÖNINQ

Patent attorneys delivery address:

reply to:

8MuNCHENeO (BOGENHAUSEN) IBERLINSs (DAHLEM)

KOLBERGER STRASSE 21 HOTTENWEG 15 Telephone: 0811/48 27 04 Telephone: 03 11/76 13 03 Telegrams: Consideration Berlin

216/13306 EN April 14, 1997O

Patent registration of the company

COMEAGNIA ITALIMA. TUBI METAL LOI FLESSIBILI S.p.A. .. Oorso Vercelli 50I Turin / Italy

"Thermostat

It:

The invention relates to a thermostat, in particular for cooling systems of internal combustion engines, with a housing, having a plurality of sections, a first having a first inlet, a second having a second inlet, and

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Poiticktckkonto MMIn Weit 1743 84 Berliner Bank AO., DapoilUnkant 1

DIPL.-INQ. DIETERJANDER DR.-INQ. MANFRED BDNINQ PATENT LAWYERS

a third is in communication with an outlet, and with one connected via radial ribs with a displaceable sleeve Hegel organ, its position as a function of the temperature of the medium flowing through the thermostat against the effect of a return spring between a first end position, in which the inlet to the first section is open and the inlet to the second section is closed, and a second End position in which the inlet to the first section is closed and the inlet to the second section is open, back and forth is movable.

Thermostats of the above type are mainly used in internal combustion engines arranged at the end of a circulation channel which is parallel to the cooler. They are used to get out of the cooler and to mix the cooling liquid coming into the circulation channel in such a way that a favorable one very quickly when the machine is started up Working temperature reached and this is then maintained. The regulating device that responds to the temperature generally occupies such a position in the thermostat housing that the cooling liquid from one inlet substantially perpendicular to the axis of the regulating member and the cooling liquid from the other inlet essentially along the axis of the regulating member flows past this.

A thermostat of the type described above is known, in which the sleeve connected to the control element is only open and Closing one inlet is used while the other inlet is opened and closed by a valve disc leaves. The sleeve and the valve disc are in the "known" design arranged in a cylindrical insert that can be inserted into the valve housing and that of a first chamber formed first section of the thermostat housing from that of

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DIPL.-ING- DIETER JANDER DR.INQ. MANFRED BONINQ PATENT LAWYERS

a second chamber formed second section of the thermostat housing separates when the valve disk is arranged against one at the bottom of the insert, a central first Inlet surrounding valve seat rests. In this design, the sleeve only has the task of being a radial Opening formed in the insert to open or close the second inlet more or less. The known Thermostat is not fully satisfactory for several reasons. One reason is that the sleeve, which is a more sensitive one Regulation allowed as a poppet valve to control only one of the two inlets. Another reason is that the construction of the known thermostat is comparatively complicated with regard to the use of an insert.

The invention is based on the object of a thermostat to create that is particularly simple and, regardless of its simple structure, sensitive and safe regulation the temperature of the medium flowing through it. According to the invention, this object is achieved in that at a thermostat of the type described above, the inlets are formed by radial openings in the thermostat housing and the sleeve is slidably mounted in the latter in such a way that in the first end position it opens the inlet to the first section leaves open while closing the inlet to the second section and in the second end position the inlet to the second section with simultaneous closure of the inlet to the first section releases.

The thermostat according to the invention is extremely simple. He prevents one from running with him equipped internal combustion engine undesirably high temperature fluctuations of the cooling liquid leaving it. By

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DIPL.-INO. DIETER JANDER DR.-ING- MANFRED BONINO <£ U 1% # I O 1 PATENT LAWYERS

the omission of an insert is not just the number of its Reduced individual parts, but also made assembly easier. The simple assembly is beneficial if that Control element by the return spring against an end wall of the thermostat housing formed by a removable cover is pressed.

Because the sleeve is used to control both inlets, it can be used without increasing the external dimensions of the thermostat get a greater length than is the case with the known thermostat. This gives you enlarged Guide surfaces. Another improvement in leadership the sleeve can be achieved in that the radial rip

the
connect perydas control element with the sleeve, protrude into the third section of the thermostat housing and be guided by its wall.

An exemplary embodiment of the invention is explained in more detail below with reference to the accompanying drawing. Show it:

Fig. 1 is a longitudinal section through a thermostat according to the invention}

Fig. 2 shows a section along the line ΙΙ-ΙΓ in Fig. 1 and

Fig. 3 is a perspective view of a detail of the Thermostats according to FIGS. 1 and 2.

The thermostat according to the invention has a housing 1 with two inlets 2 and 3. The inlet 2 can be connected to a circulation channel (not shown) of a cooling system and the inlet 3 be connected to the drain pipe of a cooler. The case

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DIPL. INQ. DIETER JANDER DR.-I NQ. MANFRED BONINQ PATENT LAWYERS

is also provided with an outlet 4 which runs essentially parallel to the longitudinal axis of the inlet 2.

The housing 1 "has a central chamber 20 which is transverse to the Inlet 2 and outlet 4 is arranged. At one end of the Chamber is an annular groove 5 »with the inlet 3 in Connection is, the longitudinal axis of which is slightly inclined with respect to the longitudinal axis of the inlet 2. The chamber 20 with the annular groove 5 will. closed at one end by a cover 6 which is connected to the housing 1 by known means. At the end facing away from the cover 6, a recess 7 is machined into the wall section 9 of the chamber, the inner surface of which was designated 10. The recess is connected to an annular groove 11 which is incorporated into a wall section 8 and communicates with the inlet 2 via a channel 12.

13 is a second chamber, the diameter of which is smaller than the diameter of the chamber 20 to which it adjoins. The chamber 13 is in communication with the outlet 4.

A cylindrical sleeve 15 is slidable back and forth in the Chamber 20 arranged. Their length is so great that they make the recess 7 and the annular groove 11 is completely free when its end 15a. rests against the cover 6 · The sleeve is over radial ribs 16 attached to a central ring 17 which is arranged on the cylinder 18 of a control member. It finds a regulating body more common Type of use, which has a movable part 18a which rests against the cover 6. The ribs 16 protrude in the chamber 13 and are guided by its cylindrical wall 14

A spring 19, which with its one end against the end wall 13a

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DIPL. -INQ. DIETER JANDER DR.-INQ. MANFRED BONlNC fc " lii IO I

PATENT LAWYERS

the chamber 13 rests, is supported at its other end at 21 via a disc, not shown, on the ends of the ribs 16 and presses them together with the control member 18, 18a against the lid 16

The thermostat according to the invention works as follows:

In the position shown in Fig. 1, the connection between the inlet 3 (and the cooler connected to it) and the outlet 4 (and the connected cooling jacket of an internal combustion engine) interrupted. Instead, the coolant flows freely through inlet 2 (i.e. from the circulation passage coming) to outlet 4. If the temperature of the cooling liquid, which enters the thermostat from inlet 2, rises, the control element 18, 18a responds and causes the moving parts 18a to emerge from the cylinder 18. The movement of the part 18a is the unit formed by the sleeve 15, the cylinder 18 and the ribs 16 in Fig. 1 against the effect the spring 19 serving for resetting moves upwards. The movement of the sleeve 15 leads to a closure of the channel 12 or, of the inlet 2 and to interrupt the connection between the inlet 2 and the outlet 4, as soon as the sleeve the Has passed edge 9a (see Fig. 2). With the closing of the channel 12 becomes the passage between the end 15a of the sleeve 15 and the lid 6 opened. Liquid can therefore enter the chamber 20 from the annular groove 5 and via the chamber 13 get to outlet 4. The quantities of liquid entering from inlets 2 and 3 are mixed with one another in chamber 20. The respective end position of the sleeve is determined by the force of the spring 19 and the counterforce exerted by the control element. The spring 19 and the control element 13, 18a must be selected in this way that the optimum working temperature of the internal combustion engine is present in the equilibrium state. If

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DIfL.-INO. DIETER JANDER DR.INQ. MANFRED BON INQ * "

FATE N LAWYERS

the temperature in the chamber falls below the target temperature, the movable part 18 goes back into the cylinder 19 of the regulating member and the sleeve 15 moves back under the action of the spring 19 to the proportion of from the inlet 3 in the To reduce thermostats flowing medium and the proportion of flowing from the inlet 2 through the channel 12 into the chamber Increase coolant.

MB: KK

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Claims (2)

Claims 1. Thermostat, especially for cooling systems of internal combustion engines, with a housing that has several sections of which a first with a first inlet, a second with a second inlet and a third with an outlet is in connection, and with a control member connected to a displaceable sleeve via radial ribs, its position depending on the temperature of the medium flowing through the thermostat against the action of a return spring between a first end position in which the inlet to the first section is open and the inlet to the second section is closed and a second end position in which the inlet to the first section is closed and the inlet to the second section is open, can be moved back and forth, thereby g e - 109810/1382 DIPL.-INQ. DIETER JANDER DR.-INQ. MANFRED! ONING FATE N ADVOCATE lcennzeich.net that the inlets (3 * 4 ·) of radial Openings are formed in the thermostat housing (1) and the sleeve (25) is slidably mounted in the latter in such a way that that in the first end position they open the inlet (3) to the first section while at the same time closing the inlet (4) leaves open to the second section and in the second end position the inlet (4-) to the second section while at the same time Closing the inlet (3) to the first section releases. 2. Thermostat according to claim 1, characterized in that that the control member (18,18a) formed by the return spring (19) against a removable cover (16) The front wall of the thermostat housing (l) is pressed. 3 · Thermostat according to claim 1 or 2, characterized in that the radial ribs (16) which the regulating member Connect (18,18a) with the sleeve (15), protrude into the third section of the thermostat housing (l) and from its wall be guided. 109810/1382