DE202020102768U1 - Electrical support rod of a motor vehicle tailgate - Google Patents

Abstract

Electrical support rod of a motor vehicle tailgate, characterized in that the electrical support rod comprises a lead screw (1), a lead screw sleeve (2), a lead screw nut (3), a spring (4), an inner sleeve (5), an outer sleeve (6), comprises an upper ball socket assembly (7), a lower ball socket assembly (8), an electric motor assembly (9) and a spring support tube (11), one end on which the electric motor assembly is located being defined as the direction above, with an output side of the electric motor assembly drives the upper end of the lead screw (1) and the lower end of the lead screw (1) is connected to the lead screw nut (3), the lead screw nut (3) being fixedly attached to the upper end of the lead screw sleeve (2), both the lower The end of the lead screw sleeve (2) and the lower end of the inner sleeve (5) are firmly connected to the lower ball socket assembly, with the spring support tube (11) on the outer circumference of the lead screw sleeve ( 2) pushed on, the spring (4) pushed onto the outer circumference of the spring support tube (11), the inner sleeve (5) pushed onto the outer circumference of the spring (4) and the outer sleeve (6) pushed onto the outer circumference of the inner sleeve (5) and along the axial direction of the inner sleeve (5) is movable, the upper end of the outer sleeve (6) being fixedly connected to the upper ball socket assembly (7), the upper end surface of the spring support tube (11) having an upper limiting section (111) and the outer sleeve (6) is provided with a first limiting section (61) matched to the upper limiting section (111), the upper limiting section (111) and the first limiting section (61) forming a first anti-rotation structure by interaction with one another and by the interaction of the upper limiting section ( 111) and the first limiting section (61) secure the spring support tube (11) and the electric motor assembly (9) against rotation in the circumferential direction The inner wall surface of the spring support tube (11) is provided with a plurality of axially arranged limiting grooves (112) and the upper region of the inner sleeve (5) is provided with a projecting strip (51) matched to the limiting groove (112), the limiting groove (112) and the protruding bar, by interacting with one another, form a second anti-rotation structure and, by means of the interaction of the protruding bar and the limiting groove (112), the spring support tube (11) and the inner sleeve (5) can be secured against rotation in the circumferential direction, the upper end the lead screw (1) has a circumferential groove into which a sealing ring (10) is inserted, the sealing ring (10) and the electric motor assembly (9) being sealed off from one another, with the housing on the output side of the electric motor assembly (9) and a step the outer sleeve (6) a sealing washer (12) is provided through which the housing of the output side (6) of the El Electric motor assembly (9) and the outer sleeve (6) are sealed from one another, the lower region of the inner sleeve (5) being provided with four first water outlet bores (52) and the first water outlet bores (52) being through the wall of the inner sleeve (5 ) through holes, while the area of the outer sleeve (6) under the electric motor assembly (9) has four second water outlet holes (62) and the second water outlet holes (62) are through holes through the wall of the outer sleeve (6).

Description

TECHNICAL AREA

The present teachings relate to the field of automotive accessories, in particular an electrical support rod of a motor vehicle tailgate.

STATE OF THE ART

At the moment more and more motor vehicles are using automatically opening and closing tailgates, so that customers place higher demands on aesthetics and practicality.

In the case of an electrical support rod, one end is usually attached to a body by the interaction of a ball head with a ball socket assembly, and the other end is attached to a tailgate. The housing of an electric motor assembly is attached to an outer sleeve. An output side of the electric motor assembly rotates a lead screw, which is finally used to extend or retract the electric support rod. When starting the electric motor assembly and when the ball head and the ball socket assembly work together, there is a gap and the electric motor assembly generates a counterforce, so that the inner sleeve, which is firmly connected to a lead screw nut, can rotate along with it, which affects the stability of the electric support rod, and on the other hand over time the parts inside the electric support rod are easily damaged and strong vibration is caused when starting, which affects the stability and thus the user experience.

Furthermore, when the door is closed, the outer sleeve section of the electrical support rod is at the top and the inner sleeve section is at the bottom, so that generally no water penetrates into the electrical support rod. However, in the event of persistent rain or car washing, water inevitably penetrates the interior of the electric support rod even when the tailgate is closed. In addition, when the tailgate is open, when washing the car, the inner sleeve section is at the top and the outer sleeve section is at the bottom, and in this case water penetrates into the outer sleeve more easily through the gap at the junction of the inner and outer sleeves. If the water is not drained in time, the electric motor assembly and other drive parts could easily be damaged, which would affect the performance of the electric support rod.

CONTENT OF THE PRESENT TEACHING

To overcome the above disadvantages, the present teachings are based on the object of providing an electric support rod of a motor vehicle tailgate, which effectively improves the anti-rotation result of the electric motor assembly and facilitates the smooth discharge of the water penetrating into the interior of the support rod, which ensures the performance stability of the electrical components Support rod ensures.

According to the present teachings, the object is achieved by the following configuration: An electrical support rod of a motor vehicle tailgate is provided, which has a lead screw, a lead screw sleeve, a lead screw nut, a spring, an inner sleeve, an outer sleeve, an upper ball socket assembly, a lower ball socket assembly , an electric motor assembly and a spring support tube, one end at which the electric motor assembly is located being defined as the direction above, an output side of the electric motor assembly driving the upper end of the lead screw and the lower end of the lead screw being connected to the lead screw nut, wherein the lead screw nut is fixedly attached to the upper end of the lead screw sleeve, both the lower end of the lead screw sleeve and the lower end of the inner sleeve being firmly connected to the lower ball socket assembly, the spring support tube being pushed onto the outer circumference of the lead screw sleeve , the spring is pushed onto the outer circumference of the spring support tube, the inner sleeve is pushed onto the outer circumference of the spring and the outer sleeve is pushed onto the outer circumference of the inner sleeve and is movable along the axial direction of the inner sleeve, the upper end of the outer sleeve being firmly connected to the upper ball socket assembly , wherein the upper end surface of the spring support tube has an upper limiting section and the outer sleeve is provided with a first limiting section which is matched to the upper limiting section, the upper limiting section and the first limiting section forming a first rotation-securing structure by interaction with one another and by the interaction of the upper limiting section and the can be secured against rotation in the circumferential direction, the inner wall surface of the spring support tube with a plurality of axially arranged boundary grooves and the upper region of the inner sleeve is provided with a protruding ledge matched to the limiting groove, the limiting groove and the protruding ledge forming a second anti-rotation structure by interaction with one another and by the interaction of the protruding ledge and the limiting groove, the spring support tube and the inner sleeve can be secured against rotation in the circumferential direction, the upper end of the lead screw having a circumferential groove in which a sealing ring is installed, the sealing ring and the electric motor assembly being sealed to one another, with the housing on the output side the electric motor assembly and a step of the outer sleeve, a sealing washer is provided, through which the housing of the output side of the electric motor assembly and the outer sleeve are sealed from one another, the lower region of the inner sleeve being provided with four first water outlet bores and the first water outlet bores being through the wall of the inner sleeve are through bores, while the area of the outer sleeve under the electric motor assembly has four second water outlet bores and the second water outlet bores are passages running through the wall of the outer sleeve bores.

According to the present teachings, the task is solved by the following further development: The connection point between the upper ball socket assembly or the lower ball socket assembly and a ball head is defined as a ball head connection section, the ball head connection section being a recess matched to the ball head , wherein the recess is provided with several oil storage recesses for storing oil.

It is further provided that both the upper delimitation section and the first delimitation section are a delimitation section which is formed by indentations and bulges which are arranged circumferentially and at a distance from one another.

It is also provided that the lower end of the inner sleeve is connected to the lower ball socket assembly by riveting.

It is further provided that each of the ball head connection sections is provided with four oil storage recesses, which are arranged at a uniform distance from one another on the ball head connection section.

It is further provided that the upper end of the outer sleeve is connected to the upper ball socket assembly by laser welding.

It is further provided that both the first water outlet bores and the second water outlet bores have a diameter of 2.5 to 3.5 mm.

It is further provided that the upper ball socket assembly is connected to a body via the ball head.

It is also provided that the lower ball socket assembly is connected to a tailgate via the ball head.

The present teachings are advantageously characterized in that the present teachings include a lead screw, a lead screw nut, a spring, an inner sleeve, an outer sleeve, an upper ball socket assembly, a lower ball socket assembly, a spring support tube and an electric motor assembly. The upper end surface of the spring support tube has an upper limiting section and the interaction of the upper limiting section and a first limiting section of the outer sleeve means that the spring supporting tube and the electric motor assembly can be secured against rotation in the circumferential direction. The inner wall surface of the spring support tube is provided with a plurality of axially arranged limiting grooves and the upper region of the inner sleeve is provided with a protruding ledge which is matched to the limiting groove. The spring support tube and the inner sleeve can be secured against rotation in the circumferential direction by the interaction of the projecting strip and the limiting groove. It is therefore achieved in the present teachings that, on the one hand, rotation of the electric motor assembly relative to the electric support rod is prevented, and thus the stability of the support rod system is increased, while, on the other hand, no strong vibration and displacement of the electric support rod is caused when the lead screw is driven by the electric motor assembly, which the smooth movement of the support rod up and down is improved. Furthermore, the lower area of the inner sleeve is provided with four first water outlet bores and the area of the outer sleeve located under the electric motor assembly has four second water outlet bores, so that the electric support rod delivers a good water drainage result according to the present teachings and that in rainy weather as well as when washing the car resulting water can be drained off in good time, thereby impairing the function of individual parts as a result of excessive moisture within the support rod over a long period of time and extending the service life of the support rod. The interaction of the sealing washer and the sealing ring prevents the water remaining in the outer sleeve from penetrating into the interior of the electric motor assembly.

Furthermore, the ball head connecting portion of the lower and upper ball socket assemblies is in the present teachings as formed a recess matched to the ball head, which is provided with several oil storage recesses for storing oil, so that when the support rod is connected to the body and the tailgate via the ball head according to the present teachings, the oil stored in the oil storage recess can lubricate the ball head, making it easy to move when opening or closing the tailgate is improved.

In addition, in the present teachings, the lower end of the inner sleeve is connected to the lower ball socket assembly by riveting, whereas, in contrast to the usual connection of the two components by screwing in the present teachings, due to the riveting of the inner sleeve and the lower ball socket assembly, even with long-term use or with heavy use Vibration of the motor vehicle the loosening of the connection of the inner sleeve and the lower ball socket assembly is prevented, which ensures improved safety performance.

In addition, in the present teachings, both the first water outlet holes and the second water outlet holes can have a diameter of 2.5 to 3.5 mm, so that the diameter is appropriately dimensioned. If the diameter is too large, dust and contaminants easily penetrate into the interior of the electric support rod, which deteriorates the performance of the electric support rod over time, while if the diameter is too small, an insufficient water drainage result will be caused, which will also impair the performance of the electrical support rod over time .

Figure list

• 1 eine Außenansicht gemäß den vorliegenden Lehren;
• 2 eine schematische strukturelle Explosionsansicht der vorliegenden Lehren;
• 3 eine vergrößerte Teilansicht der Stelle A gemäß 2;
• 4 eine vergrößerte Teilansicht der Stelle B gemäß 2;
• 5 eine Schnittansicht einer ersten Drehsicherungsstruktur gemäß den vorliegenden Lehren;
• 6 eine radiale Schnittansicht einer Innenhülse gemäß den vorliegenden Lehren;
• 7 eine schematische Strukturansicht einer oberen Kugelpfannenbaugruppe gemäß den vorliegenden Lehren;
• 8 eine axiale Schnittansicht der vorliegenden Lehren; und
• 9 eine vergrößerte Teilansicht der Stelle C gemäß 8.

Show it:

• 1 an exterior view according to the present teachings;
• 2nd an exploded schematic structural view of the present teachings;
• 3rd an enlarged partial view of location A according 2nd ;
• 4th an enlarged partial view of point B according to 2nd ;
• 5 a sectional view of a first anti-rotation structure according to the present teachings;
• 6 a radial sectional view of an inner sleeve according to the present teachings;
• 7 a schematic structural view of an upper ball cup assembly according to the present teachings;
• 8th an axial sectional view of the present teachings; and
• 9 an enlarged partial view of location C according to 8th .

• 1 - Leitspindel, 2 - Leitspindelhülse, 3 - Leitspindelmutter, 4 - Feder, 5 - Innenhülse, 51 - hervorstehende Leiste, 52 - erste Wasseraustrittsbohrung, 6 - Außenhülse, 61 - erster Begrenzungsabschnitt, 62 - zweite Wasserauslassbohrung, 7 - obere Kugelpfannenbaugruppe, 71 - Kugelkopf-Verbindungsabschnitt, 711 - Ölspeichersaussparung, 8 - untere Kugelpfannenbaugruppe, 9 - Elektromotorbaugruppe, 10 - Dichtring, 11 - Federstützrohr, 111 - oberer Begrenzungsabschnitt, 112 - Begrenzungsnut, 12 - Dichtscheibe

The reference symbols stand for the following parts:

• 1 - lead screw, 2 - lead screw sleeve, 3 - lead screw nut, 4 - spring, 5 - inner sleeve, 51 - protruding ledge, 52 - first water outlet hole, 6 - outer sleeve, 61 - first limiting section, 62 - second water outlet hole, 7 - upper ball socket assembly, 71 - Ball head connecting section, 711 - Oil reservoir recess, 8 - lower ball socket assembly, 9 - electric motor assembly, 10 - sealing ring, 11 - spring support tube, 111 - upper limiting section, 112 - limiting groove, 12 - sealing washer

DETAILED DESCRIPTION

The following exemplary embodiment serves to explain the present teachings without restricting the scope of the teachings. Modifications or substitutions of procedures, steps or conditions of the teaching, which are carried out without deviating from the basic idea and essence of the present teaching, fall within the scope of protection of the teaching.

Exemplary embodiment: How to look 1 to 9 results, an electrical support rod of a motor vehicle tailgate comprises a lead screw 1 , a lead screw sleeve 2nd , a lead screw nut 3rd , a feather 4th , an inner sleeve 5 , an outer sleeve 6 , an upper ball socket assembly 7 , a lower ball socket assembly 8th , an electric motor assembly 9 and a spring support tube 11 . One end where the electric motor assembly is located is defined as the upward direction. An output side of the electric motor assembly drives the upper end of the lead screw and the lower end of the lead screw is connected to the lead screw nut, the lead screw nut being fixedly attached to the upper end of the lead screw sleeve. Both the lower end of the lead screw sleeve and the lower end of the inner sleeve are firmly connected to the lower ball socket assembly. The spring support tube is pushed onto the outer circumference of the lead screw sleeve, the spring is pushed onto the outer circumference of the spring support tube, the inner sleeve is pushed onto the outer circumference of the spring and the outer sleeve is pushed onto the outer circumference of the inner sleeve and is movable along the axial direction of the inner sleeve. The upper end of the outer sleeve is firmly connected to the upper ball socket assembly.

The upper end surface of the spring support tube has an upper boundary portion 111 on and the outer sleeve is with a first boundary portion matched to the upper boundary portion 61 Mistake. The upper limiting section and the first limiting section, by interacting with one another, form a first anti-rotation structure and through the interaction of the upper limiting section and the first limiting section, the spring support tube and the electric motor assembly can be secured against rotation in the circumferential direction.

The inner wall surface of the spring support tube is provided with a plurality of axially arranged limiting grooves 112 is provided and the upper area of the inner sleeve is provided with a protruding bar which is matched to the limiting groove 51 Mistake. The limiting groove and the protruding bar form a second anti-rotation structure by interaction with one another, and the spring support tube and the inner sleeve can be secured against rotation in the circumferential direction by the interaction of the protruding bar and the limiting groove. In the present embodiment, both the above ledge and the restriction groove are provided in three groups, but are not limited thereto.

The upper end of the lead screw has a circumferential groove in which a sealing ring 10th is used, the sealing ring and the electric motor assembly being sealed to one another.

There is a sealing washer between the housing of the output side of the electric motor assembly and a step of the outer sleeve 12th provided by which the housing of the output side of the electric motor assembly and the outer sleeve are sealed from one another.

Due to the interaction of the sealing ring and the sealing washer, the housing on the one hand and the upper end of the lead screw and the outer sleeve on the other hand are sealed in the axial direction, so that even if there is any moisture remaining in the outer sleeve, it does not penetrate into the interior of the electric motor assembly, which means the environment in which it is used Lifetime of the electrical assembly can be ensured.

The lower area of the inner sleeve has four first water outlet holes 52 provided and the first water outlet holes are through holes running through the wall of the inner sleeve, while the area of the outer sleeve located under the electric motor assembly is four second water outlet holes 62 and the second water outlet holes are through holes running through the wall of the outer sleeve. In the present exemplary embodiment, the four first water outlet bores are arranged at an even distance from one another along the circumferential direction of the inner sleeve, while the four second water outlet bores are arranged at an even distance from one another along the circumferential direction of the outer sleeve.

In the present exemplary embodiment, the connection point between the upper ball socket assembly or the lower ball socket assembly and a ball head is a ball head connecting section 71 Defined, wherein the ball head connecting section is a recess matched to the ball head, the recess having a plurality of oil storage recesses 711 is provided for storing oil.

In the present exemplary embodiment it is provided that both the upper delimitation section and the first delimitation section are a delimitation section which is formed by indentations and bulges which are arranged circumferentially and spaced apart from one another.

In the present exemplary embodiment, it is provided that the lower end of the inner sleeve is connected to the lower ball socket assembly by riveting. A conventional inner sleeve is screwed to the lower ball socket assembly, while in the present teachings the two components are connected to one another by riveting. Thus, even with long-term use or with strong vibration of the motor vehicle, the loosening of the connection point of the inner sleeve and the lower ball socket assembly is prevented, which ensures improved safety performance.

In the present exemplary embodiment, it is provided that each of the ball-head connection sections is provided with four oil storage recesses, which are arranged on the ball-head connection section evenly spaced apart from one another.

In the present exemplary embodiment it is provided that the upper end of the outer sleeve is connected to the upper ball socket assembly by laser welding.

In the present exemplary embodiment, it is provided that both the first water outlet bores and the second water outlet bores have a diameter of 2.5 to 3.5 mm. The diameter is therefore appropriately dimensioned. If the diameter is too large, dust and contaminants easily penetrate into the interior of the electric support rod, which deteriorates the performance of the electric support rod over time, while if the diameter is too small, an insufficient water drainage result will be caused, which will also impair the performance of the electrical support rod over time . In the present exemplary embodiment, it is provided that both the first water outlet bores and the water outlet bores have a diameter of 3 mm. It is understood that the following structure can be used for the first water outlet bores and the second water outlet bores: Both the inner wall of the inner sleeve at the locations assigned to the first water outlet bore and the inner wall of the outer sleeve at the locations assigned to the second water outlet bores are each provided with a dust filter screen (not shown). The dust filter sieve is a sieve that allows water to pass through, but no major impurities or particles. For example, a metallic 120-mesh filter screen is conceivable, but there is no restriction here as long as the above task can be accomplished.

The upper ball socket assembly is connected to a body via the ball head.

The lower ball socket assembly is connected to a tailgate via the ball head.

• Das Arbeitsprinzip der elektrischen Stützstange einer Kraftfahrzeug-Heckklappe ist Stand der Technik, weshalb eine ausführliche Beschreibung entfällt. Es sei beispielsweise auf die chinesische Gebrauchsmusterschrift „Balancier-Stützstange einer Kraftfahrzeug-Heckklappe“ mit der Nummer ZL 201821340318.4 verwiesen. In dem vorliegenden Ausführungsbeispiel ist zwischen der Feder und der Leitspindelhülse zusätzlich ein Federstützrohr vorgesehen und das obere Ende des Federstützrohrs und die Außenhülse werden über die erste Drehsicherungsstruktur gegen Drehung in Umfangsrichtung gesichert, während die Innenwandfläche des Federstützrohrs und die Leitspindelhülse über die zweite Drehsicherungsstruktur gegen Drehung in Umfangsrichtung gesichert werden. Die Ausgangsseite der Elektromotorbaugruppe treibt über eine Wellenkupplung die Leitspindel drehend an, und diese Drehung wird durch die Leitspindelmutter in eine geradlinige relative Bewegung der Innenhülse umgewandelt, womit das Ein- bzw. Ausfahren der Elektrische Stützstange verwirklicht wird. Unter Einwirkung des Federstützrohrs treibt die Antriebskraft der Elektromotorbaugruppe die Leitspindel lediglich drehend an. Die Schwingung des Elektromotorkörpers, die beim Starten der Elektromotorbaugruppe durch eine Gegenkraft, die sich aus der Drehung der Elektromotorwelle und der Drehung des Elektromotorkörpers (der Elektromotorkörper ist mit der Außenhülse fest verbunden) ergibt, verursacht wird, wird dann durch die Drehsicherung des oberen Endes des Federstützrohrs und der Außenhülse in Umfangsrichtung sowie die Drehsicherung des unteren Endes und der Leitspindelhülse in Umfangsrichtung ausgeglichen.

The principle of operation and the procedure of the present teachings are as follows:

• The principle of operation of the electrical support rod of a motor vehicle tailgate is state of the art, which is why a detailed description is omitted. For example, reference is made to the Chinese utility model "Balancing support rod of a motor vehicle tailgate" with the number ZL 201821340318.4. In the present exemplary embodiment, a spring support tube is additionally provided between the spring and the lead screw sleeve, and the upper end of the spring support tube and the outer sleeve are secured against rotation in the circumferential direction via the first anti-rotation structure, while the inner wall surface of the spring support tube and the lead screw sleeve against rotation in Circumferential direction are secured. The output side of the electric motor assembly rotates the lead screw via a shaft coupling, and this rotation is converted by the lead screw nut into a straight relative movement of the inner sleeve, thereby realizing the extension and retraction of the electric support rod. Under the action of the spring support tube, the driving force of the electric motor assembly only drives the lead screw in a rotating manner. The vibration of the electric motor body, which is caused by a counterforce resulting from the rotation of the electric motor shaft and the rotation of the electric motor body (the electric motor body is fixedly connected to the outer sleeve) when starting the electric motor assembly, is then caused by the anti-rotation device of the upper end of the Compensated spring support tube and the outer sleeve in the circumferential direction and the rotation lock of the lower end and the lead screw sleeve in the circumferential direction.

In other words, when the electric motor assembly is started, a strong oscillation or rotation of the electric support rod and the entire electric motor assembly is prevented by the first anti-rotation structure and the inner wall surfaces of the spring support tube and the lead screw sleeve are fixed relative to one another in the circumferential direction, which only allows axial movement of the lead screw sleeve, but circumferential rotation is prevented. Thus, a strong vibration or displacement of the electrical support rod is avoided during the entire operation of the electrical support rod, which ensures improved smooth movement of the support rod up and down.

The lower area of the inner sleeve is provided with four first water outlet bores and the area of the outer sleeve located under the electric motor assembly has four second water outlet bores. When the tailgate is closed, the outer sleeve section is at the top and the inner sleeve section is at the bottom, and water that penetrates into the interior of the electric support rod during persistent rain or when washing the car is drained off via the first water outlet bores of the inner sleeve. When the tailgate is open, the outer sleeve section is at the bottom and the inner sleeve section is at the top, and water which penetrates into the interior of the electrical support rod when washing the car is drained off via the second water outlet holes in the outer sleeve.

It goes without saying that the above exemplary embodiment merely represents an example in favor of a clear description, without restricting the invention.

Claims (9)

Electrical support rod of a motor vehicle tailgate, characterized in that the electrical support rod comprises a lead screw (1), a lead screw sleeve (2), a lead screw nut (3), a spring (4), an inner sleeve (5), an outer sleeve (6), an upper ball socket assembly (7), a lower ball socket assembly (8), an electric motor assembly (9) and a spring support tube (11), one end at which the Electric motor assembly is defined as the direction above, an output side of the electric motor assembly drives the upper end of the lead screw (1) and the lower end of the lead screw (1) is connected to the lead screw nut (3), the lead screw nut (3) being firmly attached the upper end of the lead screw sleeve (2), wherein both the lower end of the lead screw sleeve (2) and the lower end of the inner sleeve (5) are fixedly connected to the lower ball socket assembly, the spring support tube (11) on the outer circumference of the lead screw sleeve (2) pushed on, the spring (4) pushed onto the outer circumference of the spring support tube (11), the inner sleeve (5) pushed onto the outer circumference of the spring (4) and the outer sleeve (6) pushed onto the outer circumference of the inner sleeve (5) and is movable along the axial direction of the inner sleeve (5), the upper end of the outer sleeve (6) being fixedly connected to the upper ball socket assembly (7), the upper end surface of the spring support tube (11) has an upper boundary section (111) and the outer sleeve (6) is provided with a first boundary section (61) matched to the upper boundary section (111), the upper boundary section (111) and the first boundary section (61) form a first anti-rotation structure by interaction and by the interaction of the upper boundary section (111) and the first boundary section (61) the spring support tube (11) and the electric motor assembly (9) can be secured against rotation in the circumferential direction, the inner wall surface of the spring support tube (11 ) is provided with a plurality of axially arranged limiting grooves (112) and the upper region of the inner sleeve (5) is provided with a projecting bar (51) which is matched to the limiting groove (112), the limiting groove (112) and the projecting bar interacting with one another form second anti-rotation structure and by the Zusa interaction of the protruding ledge and the limiting groove (112), the spring support tube (11) and the inner sleeve (5) can be secured against rotation in the circumferential direction, the upper end of the lead screw (1) having a circumferential groove into which a sealing ring (10) is used, the sealing ring (10) and the electric motor assembly (9) being sealed to one another, a sealing washer (12) being provided between the housing of the output side of the electric motor assembly (9) and a step of the outer sleeve (6) through which the housing the output side (6) of the electric motor assembly (9) and the outer sleeve (6) are sealed off from one another, the lower region of the inner sleeve (5) being provided with four first water outlet bores (52) and the first water outlet bores (52) being through the wall of the inner sleeve (5) runs through holes, while the area of the outer sleeve (6) located under the electric motor assembly (9) has four second water outlets bores (62) and the second water outlet bores (62) are through bores running through the wall of the outer sleeve (6). Electric support rod of a motor vehicle tailgate after Claim 1 , characterized in that the connection point between the upper ball socket assembly (7) or the lower ball socket assembly (8) and a ball head is defined as a ball head connecting section (71), the ball head connecting section (71) being one on the Ball head matched recess, the recess being provided with a plurality of oil storage recesses (711) for storing oil. Electric support rod of a motor vehicle tailgate after Claim 1 , characterized in that both the upper boundary section (111) and the first boundary section (61) are a boundary section which is formed by indentations and bulges which are arranged circumferentially and spaced apart from one another. Electric support rod of a motor vehicle tailgate after Claim 1 , characterized in that the lower end of the inner sleeve (5) is connected to the lower ball socket assembly (8) by riveting. Electric support rod of a motor vehicle tailgate after Claim 2 , characterized in that each ball head connecting section (71) is provided with four oil storage recesses, which are arranged evenly spaced from one another on the ball head connecting section (71). Electric support rod of a motor vehicle tailgate after Claim 1 , characterized in that the upper end of the outer sleeve (6) is connected by laser welding to the upper ball socket assembly (7). Electric support rod of a motor vehicle tailgate after Claim 1 , characterized in that both the first water outlet bores (52) and the second water outlet bores (62) have a diameter of 2.5 to 3.5 mm. Electric support rod of a motor vehicle tailgate after Claim 1 , characterized in that the upper ball socket assembly (7) is connected to a body via the ball head. Electric support rod of a motor vehicle tailgate after Claim 1 , characterized in that the lower ball socket assembly (8) is connected to a tailgate via the ball head.

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