FR3060632A1 - CLOSE DOOR - Google Patents

Abstract

The present invention relates to a hydraulically dampable door closer which can be mounted in at least one mounting position, comprising a housing having a piston chamber, a piston coupled to a door closer shaft and slidably mounted in the piston chamber in a longitudinal direction, said piston dividing the piston chamber into a damping chamber and a non-pressure chamber, which are each filled or can be filled with a hydraulic fluid, and a channel system flow formed in the housing, which connects the damping chamber to the chamber without pressure. During a closing process, the piston moves towards the damping chamber and as a result hydraulic fluid from the damping chamber passes into the unpressurized chamber through the flow channel system. which dampens the closure. For each mounting position of the door closer, in a closure member sealingly closing the damping chamber (19), in particular a cover, or in an insert optionally inserted by complementary shape in the end opposite the piston of the damping chamber, a discharge opening at the top in the respective mounting position with respect to the piston chamber, in fluid communication with an inlet of the flow channel system, is provided for the liquid hydraulic and / or air from the damping chamber, another exhaust port can at least be provided, the sum of the median angles of all the discharge orifices amounting to 140 ° maximum.

Description

© Publication no .: 3,060,632 (to be used only for reproduction orders)

©) National registration number: 17 01338 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

COURBEVOIE © IntCI ⁸ : E 05 F 3/12 (2017.01), E 05 F 3/00

A1 PATENT APPLICATION

(© Filing date: 15.12.17. © Applicant (s): GEZE GMBH— DE. (30) Priority: 16.12.16 DE 102016225329.8. @ Inventor (s): WORNER BENJAMIN. ©) Date of public availability of the request: 22.06.18 Bulletin 18/25. ©) List of documents cited in the report preliminary research: The latter was not established on the date of publication of the request. (© References to other national documents ® Holder (s): GEZE GMBH. related: ©) Extension request (s): ® Agent (s): DENNEMEYER & ASSOCIATES SA.

104 / DOOR CLOSER.

FR 3 060 632 - A1 (37) The present invention relates to a hydraulically damped door closer which can be mounted in at least one mounting position, comprising a housing provided with a piston chamber, a piston coupled to a door closer shaft and slidably mounted in the piston chamber in a longitudinal direction, said piston dividing the piston chamber into a damping chamber and a pressureless chamber, which are each filled or can be filled with a liquid hydraulic, and a flow channel system formed in the housing, which connects the damping chamber to the pressure-free chamber. During a closing process, the piston moves in the direction of the damping chamber and as a result of which hydraulic fluid coming from the damping chamber passes into the chamber without pressure through the flow channel system, which dampens the closure. For each mounting position of the door closer, in a closing element hermetically closing the damping chamber (19), in particular a cover, or in an insert optionally introduced by complementary shape in the end opposite the piston of the damping chamber, a liquid outlet located at the top in the respective mounting position relative to the piston chamber, in fluid communication with an inlet of the flow channel system, is provided for the liquid hydraulic and / or the air coming from the damping chamber, another evacuation orifice being able to at least be provided, the sum of the median angles of the set of evacuation orifices amounting to 140 ° maximum.

11 39 Air 25 15 13 21 37

Close door

The present invention relates to a door damper with hydraulic damping which can be mounted in at least one mounting position, in particular predefined and / or according to the use, comprising a housing provided with a piston chamber, with a piston coupled to a door closer shaft and slidably mounted in the piston chamber in a longitudinal direction, which divides the piston chamber into a damping chamber and a pressure-free chamber, which are each filled or can be filled with a hydraulic fluid, in particular oil, and a flow channel system formed in the housing, which links the damping chamber to the pressureless chamber, the piston moving, during a closing process, in direction of the damping chamber and as a result of which hydraulic fluid from the damping chamber passes into the chamber without pressure through the flow channel system, which dampens the closure.

Door closers of the type mentioned above are generally known which ensure the automatic closing of a door. The damping of a door closer is effected by a hydraulic system. First a manual or automatic rotary opening movement of the door is transformed into a movement of the piston in the direction of the pressureless chamber, a spring, which acts as an energy accumulator, being prestressed. To close the door, the pre-stressed spring pushes on the piston. To move the piston in the direction of the damping chamber and allow the door to close, the hydraulic fluid, in particular the oil, coming from the damping chamber before the piston, pressurized by the spring, must s '' flow through the flow channel system into the pressure-free chamber after the piston. The flow channel system is generally provided with a throttle valve or a regulating valve which determines the closing damping of the door closer and which can in particular be adjustable.

For this purpose, it is desirable that the damping chamber be free of air bubbles. If there is air in the damping chamber, the air is first compressed during a closing process. Since the piston during compression of the air is not subject to any damping, the door loses after opening first a few degrees in the closing direction before damping takes place. The corresponding angle is designated as the sag angle. This angle should be kept as small as possible to ensure comfortable and safe passage of the door. When the door closer is filled with hydraulic fluid, however, air bubbles often remain.

Document DE 10 2014 212 357 B3 describes a flow channel system which comprises a control channel which, in a predefined mounting position, opens into an upper part in the damping chamber. Since trapped air eventually accumulates in the damping chamber, the enclosed air, after installation and before commissioning, can pass from the damping chamber into the chamber without pressure as a result of several actuations of the door closer, and will no longer lead to a collapse of the door and therefore will no longer interfere. When in the predefined mounting position, another control channel is formed in the housing in the lower area of the pressure chamber, a corresponding air exhaust can be ensured even when the door closer is turned 180 °. However, the costs associated with drilling the control channels in the housing are comparatively high.

The objective of the present invention is to provide a door closer of the type mentioned above which avoids the problem of sagging of the door due to the air trapped in the damping chamber and which can be manufactured at low cost. .

This object is achieved by a door closer having the characteristics indicated in claim 1 and characterized in that in particular in a closing element hermetically closing the damping chamber, in particular a cover, or in an insert optionally introduced by complementa3060632 rity of shape in the opposite end of the piston of the damping chamber, for each mounting position of the door closer, an evacuation orifice located at the top relative to the piston chamber in the respective mounting position , in fluid communication with an inlet orifice of the flow channel system, is provided for the hydraulic liquid and / or the air coming from the damping chamber, another evacuation orifice being able to at least be provided, the sum of the median angles of all the discharge orifices amounting to a maximum of 140 °.

According to the invention, it is therefore not necessary to provide control channels in the housing, the transfer of air from the damping chamber into the pressure-free chamber being effected either by the element of closure present anyway for the damping chamber, in particular by a cover, either by an optional insert which can be mounted in the area of the closing element and which can be made, for example, of plastics material. For this purpose, there is provided in the closing element or in the optional insert, which can also be omitted, for each predefined or conforming mounting position of the door closer, a discharge opening arranged in the upper zone of the damping chamber which is in particular in fluid communication respectively with the channel system. Preferably the channel system includes a flow channel extending in the longitudinal direction of the door closer.

The mounting position of the door closer is in particular an orientation of the door closer. One or two mounting positions can be provided. In principle, it is also possible to provide more than two predefined or user-friendly mounting positions. The median angle is also referred to as the center angle. In a sectional view of the door closer perpendicular to the longitudinal direction of the door closer, the longitudinal direction of the door closer is represented by a midpoint and the respective exhaust port is delimited by two limiting points. The respective median angle is the angle which is formed between a first connecting line from the center to the first limiting point and a second connecting line from the center to the second limiting point of the orifice. respective evacuation. An inlet port for the flow channel system is an opening for the flow channel system to open into the piston chamber. Preferably, the flow channel system includes exactly one inlet. In principle, however, it is also possible to provide several inlet openings.

In addition to the outlet openings which, in a predefined or conforming mounting position, face upwards and which are hereinafter designated as discharge openings assigned respectively to an mounting position, one or more other openings may be provided. which in a respective mounting position are not facing upwards and which are hereinafter referred to as other discharge ports. The one or more other evacuation orifices are however optional, which means that they can, in a particularly preferred manner, be omitted.

The sum of the median angles of all the evacuation orifices, in other words including the median angles of one or more other evacuation orifices, as far as they are provided, amounting to a maximum of 140 ° , which means that the proportion of exhaust orifices on the total circumference is significantly less than 50% (= 180 °), it is possible to obtain at least almost complete transfer of the air trapped in the damping chamber via the flow channel system to the pressureless chamber. The volume flow of hydraulic fluid is such that flow velocities and pressure distributions which can ensure reliable transfer of trapped air to the pressure-free chamber occur. In particular, there can thus be a sufficient suction effect to transport the enclosed air from the top to the bottom. Downward transport is particularly necessary when the flow channel system or at least part of it is arranged lower than the outlet in the respective mounting position. When there are two discharge orifices which, with respect to the longitudinal direction, are opposite one another and respectively are arranged at the top in a predefined or conforming mounting position, this is the case for at minus one of the two discharge ports. For higher proportions, this is not possible or to a too small extent. In the case where there is only one discharge orifice, and it is a discharge orifice assigned to a mounting position, the sum of the median angles consists only of a sum element, that is to say the median angle of a single discharge orifice.

Preferably, the median angle of each discharge opening is a maximum of 70 °. When two exhaust ports are provided, the sum of the median angles again rises to a maximum of 140 °. If, for example, four discharge ports are provided, the median angle of each discharge port is preferably 35 ° maximum. Preferably the sum of the median angles of all of the evacuation orifices amounts to a maximum of 70 °, preferably a maximum of 35 ° and / or the median angle of the respective evacuation orifice rises maximum 35 °, preferably 20 ° maximum. For these values, the air trapped in the damping chamber can be transferred more quickly to the pressureless chamber, in particular by means of a smaller number of door closer actuations before commissioning.

According to an improvement made to the invention, there is only one discharge orifice for each mounting position, which means that no other evacuation orifice is provided. In total, at most four discharge orifices are provided, in particular two evacuation orifices assigned respectively to a predefined or conforming mounting position and two other evacuation orifices. In principle we can also provide another number of evacuation openings.

One can in particular provide exactly two mounting positions, the affected discharge orifices of which are arranged opposite one another with respect to the longitudinal direction. For the two mounting positions of this type, the door closer can for example be mounted as a door closer located at the top or optionally as a floor door closer, or one can choose between a mon3060632 floor and a head mounting, or between a mounting on the hinge side or on the side opposite the hinges of a door, or between a mounting on a door opening to the right or to the left.

Preferably, the two discharge orifices are in fluid connection by at least one connecting channel with the same inlet orifice of the flow channel system and / or are both in fluid connection. Thus it is possible to reduce the number of channels in the flow channel system. If the inlet of the flow channel system is at the bottom, the enclosed air can be transported via the connecting channel from the top to the bottom.

The inlet can be arranged in the vertical direction between the two discharge ports. The inlet can be arranged in the center or offset between the two discharge ports. According to another improvement, the inlet orifice can be arranged at the height of one of the two evacuation orifices.

According to an improvement, the insert is designed as a discoid element which is fitted into the piston chamber, ie the connecting channel being formed by a groove formed on the outer circumference of the insert and by the inner wall of the piston. It is also possible that the closure element has a cylindrical end piece which is housed hermetically in the piston chamber, the connecting channel being formed by a groove formed on the outer circumference of the end piece and by the inner wall of the piston chamber. Or the insert and the closing element are placed one against the other hermetically, an external groove being formed in the contact area between the insert and the closing element, the connecting channel being formed by the outer groove and through the inner wall of the piston chamber.

The connecting channel can also be formed as a particularly straight passage in the insert formed in particular as a discoid element or in the closure element, or the insert can be formed as a tube-shaped element and the channel connection from inside the tube.

The closure element and / or the insert may be provided with a filter element for cleaning the hydraulic fluid circulating in the flow channel system. This is particularly advantageous when the hydraulic fluid is contaminated, for example by the friction generated when the piston moves in the piston chamber. The filter element can protect a throttle valve usually located in the flow channel system from possible impurities so that the operating capabilities of the throttle valve are not limited.

For example, the filter element may be discoid and be inserted into a filter housing of the insert. The filter housing can then be formed by an external annular contiguous element, peripheral on the bottom of the insert, the respective evacuation orifice passing through the bottom of the insert in the longitudinal direction and a radial orifice passing through the element. annular joint being provided for each mounting position of the door closer.

Improvements of the present invention are also mentioned in the dependent claims, in the description and in the drawings.

Non-limiting embodiments of the invention are shown in the drawing and are then described.

In the drawings, respectively in schematic representation,

FIG. 1 is a door closer according to the present invention in accordance with a first embodiment,

FIG. 2 is a door closer according to the present invention in accordance with a second embodiment,

Figure 3 is a part of a door closer according to the present invention in accordance with a third embodiment, Figure 4 is a door closer according to the present invention in accordance with a fourth embodiment, Figure 5 is a door closer according to the present invention in accordance with a fifth embodiment, Figure 6 is a door closer according to the present invention in accordance with a sixth embodiment, Figure 7 is a door closer according to the present invention in accordance with a seventh embodiment, and Figure 8 is a sectional view of a door closer according to the present invention comprising a closure member or an insert having four discharge ports.

Figure 1 shows a part of a housing 11 of a hydraulic door closer that can be mounted on a door according to a first embodiment in a longitudinal section. In the door closer housing 11 is formed a piston chamber 13 filled with a hydraulic liquid, in particular oil, in which a piston 15 is mounted sliding in a longitudinal direction 17. The piston chamber 13 is divided by the piston 15 in a damping chamber 19 and a pressure-free chamber 21 through which extends a piston rod 23 connected to the piston 15. The piston rod 23 is connected by a transmission mechanism for example a rack mechanism , to a door closer shaft not shown. In the pressure-free chamber 21 is mounted a spring, not shown, putting the piston 15 under pressure.

When the door is opened, the rotary opening movement of the door is transformed by the above-mentioned door closer shaft and by the piston rod 23 into a linear movement of the piston 15. More precisely, the piston 15 is pushed in the direction of the pressure-free chamber 21, hydraulic fluid coming from the pressure-free chamber 21 flowing, for volume compensation. via a non-return valve 25 formed in the piston 15 to the damping chamber 19. The above-mentioned spring is thus prestressed so that the energy thus stored can be used to close the door. When the door closes, the piston 15 moves in the direction of the damping chamber 19, hydraulic fluid coming from the damping chamber 19 returning to the pressureless chamber 21 via a flow channel system 27 formed in the housing 11 and connecting together by fluid connection the pressureless chamber 21 and the damping chamber 19. In the flow channel system 27, including a flow hole 29 extending radially in the longitudinal direction 17 and a flow hole 31 extending in the longitudinal direction 17 are shown, is mounted an adjustable throttle valve which determines the closing damping of the hydraulic door closer. The drain hole 29 thus opens by means of an inlet opening 33 in the damping chamber 19.

The door closer shown in Figure 1 can be mounted exactly in two different conforming mounting positions. The first mounting position, in which the inlet orifice 33 is arranged in the lower region of the piston chamber 13 and the two flow holes 29, 31 are arranged in the lower region of the housing 11, is shown in Figure 1. The second mounting position not shown is rotated 180 ° in the longitudinal direction 17 relative to the first mounting position shown in Figure 1, as is provided for example for mounting the door closer of your choice on a leaf or in height on a frame.

When the piston chamber 13 is filled with hydraulic fluid, it sometimes happens that a certain amount of air is trapped in the damping chamber 19. This is not desirable because, during a closing process, the Air bubbles cause the door to close without damping a few degrees first before hydraulic damping takes place. In order to be able to remove from the damping chamber 19 the enclosed air which has accumulated at the top in the damping chamber 19, a discoid insert 37 made of plastic is introduced by complementarity of form in the damping chamber 19 directly before a cover 35 hermetically closing the damping chamber 19, which for example is shown in relation to the embodiment according to FIG. 4. The insert 37 is also represented in an individual representation on the right in FIG. 1.

The insert 37 has on its end located at the top in the middle an evacuation orifice 39 assigned to the first mounting position for the hydraulic fluid and the enclosed air. The affected evacuation orifice 39 is connected by fluid connection via a connection channel 41 extending perpendicularly downwards in the form of a passage in the insert 35 to the inlet orifice 33 located on the the lower end of the insert 35 and thus to the flow channel system 27 formed in the lower zone of the housing 11, so that on this path indicated by arrows the enclosed air can be transferred by several successive actuations of the shutter - door - although the inlet 33 and the flow channel system 27 are arranged in the lower part - in the pressure-free chamber 21, where it will no longer have a negative effect on the damping of closing.

In addition, there is also provided on the lower end of the insert 35 and thus at the level of the inlet orifice 33 an assigned outlet orifice 39 ', which is arranged opposite the outlet orifice 39 assigned to the longitudinal direction 17 and assigned to the second mounting position, i.e. which, in the second mounting position, in other words when the door closer is turned 180 ° in the longitudinal direction 17 relative to Figure 1, is arranged at the top. The affected discharge port 39 'also opens into the connecting channel 41 and is thus connected to the (same) inlet port 33. The connecting channel 41 also connects the two discharge ports 39, 39' assigned respectively to an installation position. In the second mounting position, the air enclosed in the damping chamber 19 can be easily transported by the flow channel system 27 located at the top by means of the corresponding inlet port 33.

In the door closer of Figure 2, the connecting channel 41 is formed by a groove 57 formed on the outer circumference of the insert 37 (right in the individual representation) and by the inner wall of the piston chamber 13 , in particular from the damping chamber 19. In this embodiment, the hydraulic fluid and the possibly trapped air are transported in the groove 57 along a circular path (see the corresponding arrows) towards the orifice. inlet 33 of the flow channel system 27 and through the latter into the pressure-free chamber 21. As can be seen in FIG. 2, the inlet orifice 33 in this embodiment is arranged vertically, offset between the two discharge orifices 39, 39 ′ assigned. In principle, the inlet 33 and the flow channel system 27 can be provided in the circumferential direction in any position.

The discoid insert 37 shown in FIG. 2 can also be fitted with a filter 45, in particular a discoid filter, intended for cleaning the hydraulic fluid circulating in the flow channel system (see FIG. 3). Thus it is possible to protect a throttle valve arranged in the flow channel system against for example the impurities generated by friction during the movement of the piston 15 in the piston chamber 13. For this purpose, the insert 37 may include a filter housing 47 into which the filter 45 is introduced. The filter housing 47 is formed by an annular external contiguous element 51 on a bottom 49 of the insert 37. The two discharge orifices 39, 39 ' affected respectively cross in the longitudinal direction 17 the bottom 49 of the insert 37 and each of the two discharge orifices 39, 39 'affected is assigned to a radial orifice 53, 53' respectively passing through the annular contiguous element 51.

In addition, the connecting channel 41 can be provided in the form of a groove also at another location. For example, the insert 37 and the cover 37 can be placed one against the other hermetically, the groove 57 being formed as an outer groove in the contact zone between the insert 37 and the cover 35, as is shown in Figure 4. Or the cover 35 may include a cylindrical tip 43 which fits tightly into the piston chamber 13. The groove 57 can then be formed on the outer circumference of the tip 43 of the cover 35, like this is shown in Figure 5.

According to another embodiment, the connecting channel 41 can, as in FIG. 1, be formed as a straight passage, in particular a median passage, in the cover 35 (see FIG. 6). In addition, it is also possible to envisage an embodiment in which the insert 37 is formed like a tube and the connecting channel like the inside of the tube (see FIG. 7). In this case, the two affected discharge orifices 39, 39 ’can be formed in the form of split tube ends.

In principle, it is also possible to provide one or more other discharge orifices which are not assigned to any mounting position so that they are oriented upwards in the respective predefined or conforming mounting position. In FIG. 8 we see two other evacuation orifices 55, 55 ’in addition to the two evacuation orifices 39, 39’ affected.

It is essential for the present invention that the sum of the median angles a of the set of evacuation orifices 39, 39 ', 55, 55' amounts to a maximum of 140 °, in other words the proportion of the evacuation orifices 39, 39 ', 55, 55' on the total circumference of the piston chamber 13 or the damping chamber 19 is much less than 50%. Thus it can be guaranteed that a sufficient suction effect can be generated to also transport from the top down the enclosed air which accumulates at the top in the damping chamber 19 in the corresponding mounting position of the door closer. In general, it is thus possible to obtain flow and pressure ratios which allow reliable transfer of the enclosed air from the damping chamber 19 to the pressure-free chamber 21. This effect can then be obtained from a specific way when the sum of the median angles amounts to a maximum of 70 °, preferably a maximum of 35 ° and / or when the median angle has an outlet 39, 39 ', 55, 55' respective amounts to a maximum of 70 °, preferably a maximum of 35 °, preferably a maximum of 20 °.

The door closer according to the present invention allows the air trapped in the damping chamber to be reliably transferred into the chamber without pressure in order to avoid the problem of sagging of the door. At the same time, the door closer can be manufactured inexpensively.

List of reference numbers

Housing

Piston chamber

Piston

Longitudinal direction

Damping chamber

Pressure-free room

Piston rod 25 Non-return valve

Flow channel system 29 Flow hole

Drain hole

Entrance hole

Lid

Insert

Evacuation port affected

39 'Evacuation port affected

Link channel

Cylindrical tip

Filtered

Filter housing

Background

Annular joint element

Radial hole

53 ’Radial hole

Other outlet

55 ’Other drain

Middle Angle Groove

Claims (6)

Claims Hydraulically damped door closer which can be mounted in at least one mounting position, comprising a housing (11) comprising a piston chamber (13), a piston (15) coupled to a door closer shaft and slidably mounted in the piston chamber (13) in a longitudinal direction (17), said piston dividing the piston chamber (13) into a damping chamber (19) and a pressure chamber (21) which are filled or can be filled with '' a hydraulic fluid, and a flow channel system (27) formed in the housing (11) which connects together the damping chamber (19) and the pressureless chamber (21), the piston (15) moving , during a closing process, in the direction of the damping chamber (19) and as a result of which hydraulic fluid from the damping chamber (19) passes into the pressureless chamber (21) through the flow channel system (27), which dampens the process of closing, characterized in that for each mounting position of the door closer, in a closing element (35) hermetically closing the damping chamber (19), in particular a cover, or in an insert (37) optionally introduced by shape complementarity in the opposite end to the piston (15) of the damping chamber (19), a discharge orifice (39, 39 ') being at the top in the respective mounting position with respect to the piston (13), in fluid communication with an inlet orifice (33) of the flow channel system (27) is provided for the hydraulic liquid and / or the air coming from the damping chamber (19), at least one other discharge orifice (55, 55 ') can be provided, the sum of the median angles (a) of all the discharge orifices (39, 39', 55, 55 ') amounting to 140 ° to the maximum. 2. Door closer according to claim 1, 5 characterized in that the respective median angle (a) of the discharge orifice (39, 39 ’, 55, 55’) rises to a maximum of 70 °. 3. Door closer according to claim 1 or 2, 10 characterized in that the sum of the median angles (a) of the set of discharge orifices (39, 39 ', 55, 55') amounts to a maximum of 70 °, preferably a maximum of 35 ° and / or the median angle (a) of the respective discharge orifice (39, 39 ', 55, 55') is 35 ° maximum, preferably 20 ° maximum. 4. Door closer according to at least one of the preceding claims, characterized in that only one discharge orifice (39, 39 ') is provided for each mounting position and / or a maximum of four orifices in total. evacuation (39, 20 39 ’, 55, 55’) are planned. 5. Door closer according to at least one of the preceding claims, characterized in that two mounting positions are provided, including the discharge orifices (39, 25 39 ’) affected are arranged opposite one another with respect to the longitudinal direction (17). 6. Door closer according to claim 5, characterized in that the two discharge orifices (39, 39 ') are in fluid connection with one another and / or with the same inlet orifice (33 ) of the flow channel system (27) via at least one connecting channel (41). Door closer according to claim 5 or 6, characterized in that the inlet orifice (33) is arranged vertically between the two discharge orifices (39, 39 ') and / or at the height of one of the two discharge orifices (39, 39 '). Door closer according to claim 6 or 7, characterized in that the insert (37) is formed as a discoid element which is fitted into the piston chamber (13), the connecting channel (41) being formed by a groove (57) formed on the outer circumference of the insert (37) and by the inner wall of the piston chamber (13), and / or the closure element (35) comprising a cylindrical end piece (43) which is fitted hermetically into the piston chamber (13), the connecting channel (41) being formed by a groove (57) formed on the outer circumference of the end piece (43) and by the interior wall of the piston chamber ( 13) and / or the insert (37) and the closing element (35) are placed one against the other hermetically, an external groove (57) being formed in the zone of contact between the insert (37 ) and the closure element (35), the connecting channel (41) being formed by the external groove (57) and by the wall inside the piston chamber (13). Door closer according to claim 6 or 7, characterized in that the connecting channel (41) is formed as a passage in the insert (37) formed in particular as a discoid element or in the closing element (35) . Door closer according to claim 6 or 7, characterized in that the insert (37) is formed as a tube-shaped element and the connecting channel (41) from the inside of the tube. 5 11. Door closer according to at least one of the preceding claims, characterized in that the closing element (35) and / or the insert (37) is provided with a filter element (45) intended to clean the hydraulic fluid flowing in the flow channel system (27). 12. Door closer according to claim 11, characterized in that the filter element (45) is discoid and is inserted into a housing (47) for filtering the insert (37). 13. A door closer according to claim 12, characterized in that the filter housing (47) is formed by an annular contiguous element (51) peripheral exterior, formed on a bottom (49) of the insert (37), l 'orifice 20 respective discharge (39, 39 ') passing in the longitudinal direction the bottom (49) of the insert (37) and a radial orifice (53) passing through the annular joint element (51) being provided for each position of mounting the door closer.