DE102020105411A1 - Gear housing unit with polymer element and clamping screw for axial play compensation - Google Patents

Abstract

A gear housing unit which can accommodate at least part of a shaft (4) or a wheel (3) arranged on a shaft (4) and which has a housing body (5, 6) with an elastic polymer element (10) to compensate for axial play between the shaft (4 ) or the wheel (3) and the housing body (5, 6). The gear unit also has a thrust washer (9), on one side of which part of the shaft (4) or of the wheel (3) can be supported and the other side of which is supported on the elastic polymer element (10). The housing body (5, 6) has a stop (12) against which the thrust washer (9) can strike when compression of the elastic polymer element (10) has reached a predetermined level. In addition, a gear unit (1) with the gear housing unit, a shaft (4) protruding into the gear housing unit and a wheel (3) arranged on the shaft (4) within the gear housing unit.

Description

Field of invention

The invention relates to a transmission housing unit which can accommodate at least part of a shaft or a wheel arranged on a shaft and which has a housing body with an element for compensating axial play between the shaft or the wheel and the housing base body. The invention also relates to a gear unit with the gear housing unit.

Background of the invention

the end DE 102008043904 A1 a device for mounting a linear drive by means of two bolts is known, the linear drive comprising a motor on a gear with a gear housing. The gear housing has a cylindrical jacket tube in which a worm wheel is mounted radially. The axial bearing is carried out by means of a bearing washer, with a corrugated spring between the jacket tube and the bearing washer to compensate for play. Two openings on the gear housing form a bolt seat. The bolts each have a fastening section for fastening the bolt in the bolt receptacle in such a way that the bolt head is spaced from the outside of the gear housing and thus the bearing section is arranged outside the gear housing as a bearing for the linear drive.

DE 102011077584 A1 discloses an adjustment device comprising a threaded spindle and a worm wheel, the worm wheel being coupled to a drive unit via an external toothing. The worm wheel has an internal thread which meshes with an external thread of the threaded spindle, and a housing in which the worm wheel is received, the housing being formed in two parts with a first housing part and a second housing part. The housing has two axial bearing surfaces and two radial bearing surfaces. A conical spring element is used on the worm wheel to compensate for play. It lies between the worm wheel and the first axial bearing surface of the housing.

From the WO 2018215010 A1 an actuator for a motor vehicle is known, which has a housing made of a housing shell and a housing cover and an electric drive, by means of which an actuating means can be moved. The adjusting means is moved via a spindle drive, the spindle being held under pretension in a bearing receptacle. The preload is generated by means of a spring element inserted into the housing. The spring element is clamped between elevations of a rib of the housing, and the axial end of the worm wheel engages this spring element.

The problem underlying the invention

The invention is based on the object of providing an improved transmission housing unit which can accommodate at least part of a shaft or a wheel arranged on a shaft and which has a housing body with an element for axial play compensation between the shaft or the wheel and the housing base body. In particular, the invention is intended to make it possible, when using the elastic polymer elements that are customary on the market, to enable a satisfactory axial play compensation and simple assembly of the gear housing unit. The invention is also based on the object of providing an improved transmission unit with the transmission housing unit.

Solution according to the invention

In the following, in the absence of any indication to the contrary, any reference to one (including indefinite and definite articles), two or any other number of objects is to be understood in such a way that the presence of further such objects is not excluded. The reference symbols in all claims do not have a restrictive effect, but are only intended to improve their readability.

The object is achieved by a gear housing unit with the features of claim 1. The gear housing unit can accommodate at least part of a shaft or a wheel arranged on a shaft and has a housing body with an elastic polymer element for axial play compensation between the shaft or the wheel and the Housing body on. In a thread of the housing body, a clamping screw, the shaft base of which is supported on the thrust washer, is rotatably arranged and the shaft base of the clamping screw can be moved in the axial direction of the shaft by turning the clamping screw.

The invention is based, inter alia, on the knowledge that a considerable force can act in the axial direction on the elastic polymer element of a generic transmission housing unit, e.g. B. when the wheel is a worm gear of a worm gear. In such cases, an elastic polymer element with a high spring constant must be used to effectively limit the axial play. However, the assembly of such a gear housing unit with the shaft to form a gear unit can be difficult when the elastic polymer element is prestressed must be and the fitter or assembly robot can not or only with difficulty apply the force to overcome the necessary pretensioning force of the elastic polymer element.

With the tensioning screw according to the invention, the elastic polymer element can be pre-tensioned or further pre-tensioned even after the gear unit has been assembled, namely by turning the tensioning screw in such a way that the shaft base of the tensioning screw is moved in the direction of the interior of the gear housing unit. In this way, the gear unit can advantageously also be assembled in the case of an elastic polymer element with a high spring constant. The elastic polymer element is not pretensioned during assembly, but only after assembly, or the elastic polymer element is only partially pretensioned during assembly and is further pretensioned after assembly.

The invention encompasses both embodiments in which the gear housing unit completely accommodates the shaft or the wheel, as well as those embodiments in which it only partially accommodates the shaft or the wheel, for example only a portion of the shaft or the wheel. The invention includes both embodiments in which the clamping screw is supported directly on the thrust washer and those in which it is supported indirectly via another element on the thrust washer.

In the context of the present invention, an “elastic polymer” is an elastically deformable plastic, also referred to as an “elastomer”. An elastic polymer element within the meaning of the present invention consists predominantly, that is to say more than 50%, preferably more than 90%, particularly preferably more than 99% or even completely, of one or more elastic polymers. The elastic polymer element can be reinforced in one or more directions by fibers, for example glass or carbon fibers.

An “axial play compensation” in the sense of the invention is a limitation of the play of the shaft and / or the wheel in the direction of the shaft axis. Particularly preferably, the wheel or the shaft or a part thereof runs against the thrust washer, but the invention also includes embodiments of the invention in which the clamping screw runs against the thrust washer. In the context of the present invention, “start up” means that the shaft or the wheel or the part thereof or the elastic polymer element or the stop can be supported on the thrust washer in the axial direction, but the shaft and / or the wheel continue to move around its own Axis can rotate.

The object of the invention is also achieved by a gear unit according to claim 15. The gear unit comprises a shaft protruding into the gear housing unit and a wheel arranged within the gear housing unit.

Preferred embodiments of the invention

Advantageous training and further developments, which can be used individually or in combination with one another, are the subject matter of the dependent claims and the following description.

The preferred housing body has a thread, and the shaft of the clamping screw preferably has a matching mating thread, so that the clamping screw can be turned in the thread in order to be moved in the axial direction of the shaft.

In a preferred transmission housing unit, part of the shaft or the wheel can be supported on the thrust washer, particularly preferably the part of the shaft or the wheel can bear against the thrust washer.

The preferred housing body has a housing base body and a housing cover. The housing cover can advantageously facilitate the assembly of the gear housing unit and the gear unit. The housing cover can advantageously, together with a housing base body of the transmission housing unit, protect the components arranged therein from mechanical damage or contamination. The housing base body and the housing cover are preferably formed from the same material. The preferred material of the housing body, the housing base body and / or the housing cover is plastic. Preferred plastics are polyamides and glass fiber reinforced plastics, e.g. B. PA66 GF50. The plastic material can advantageously enable a particularly simple and / or inexpensive manufacture of the housing body.

The clamping screw is preferably arranged in a thread of the housing cover of the housing body. The preferred material of the clamping screw is plastic. Preferred plastics are polyamides and glass fiber reinforced plastics, e.g. B. PA66 GF50. The clamping screw is preferably formed from the same material as the gear housing or the housing cover. An achievable advantage of the plastic material can be that the clamping screw has its own spring elasticity. As a result, the stop can yield somewhat in the event of high forces acting axially on it and thus prevent damage to the gear unit.

In the preferred gear unit, the elastic polymer element is pretensioned directly or indirectly against a thrust washer. This thrust washer can either be the thrust washer on which the clamping screw is also supported, or another thrust washer, preferably on the opposite side of the housing. The elastic polymer element of a preferred gear unit is supported on its side facing away from the thrust washer on the housing body or on part of the shaft or the wheel arranged on the shaft; the elastic polymer element is therefore preferably preloaded between the thrust washer on the one hand and the housing body or wheel or shaft on the other.

The housing body of the gear housing unit preferably has a through hole through which the shaft extends. In this way, the shaft can protrude into the gear housing unit. In a preferred embodiment of the invention, the housing body has two such through holes, so that the shaft can protrude on both sides from the housing body and thus from the gear housing unit; in other words, the shaft can protrude through the housing body. For this purpose, the through holes are advantageously located at opposite ends of the housing body. Particularly preferably, the housing base body and the housing cover each have a through hole through which the shaft can extend.

In a preferred embodiment of the invention, the clamping screw has a through hole through which the shaft extends. The preferred through hole extends along the axis of the shaft of the clamping screw. In other words, the preferred clamping screw is designed as a hollow cylinder, the mating thread being located on the outside of the cylinder. In this embodiment of the invention, the bottom of the shaft of the clamping screw is designed as a ring through which the shaft runs, and this ring is supported, directly or indirectly, on the thrust washer. The preferred clamping screw sits coaxially with at least one of the through holes of the housing, so that the shaft, by running through the through hole of the clamping screw, also runs through the through hole of the housing in which the clamping screw is seated.

The preferred clamping screw does not have a head. Particularly preferably, the clamping screw has a thread extending over essentially the entire length of the outer bolt surface.

On the side facing outward with respect to the housing, the clamping screw is provided with one or more slots or projections to which a tool can be attached in order to turn the clamping screw. Two diametrically opposite slots are particularly preferably provided. The preferred clamping screw is permanently connected to the housing cover.

The preferred thrust washer on which the shaft base is supported is ring-shaped, the shaft running through the hole in the annular thrust washer; it is preferably stationary relative to the rotating wheel, that is, the wheel runs against the thrust washer. The preferred thrust washer on which the elastic polymer element is supported is ring-shaped, the shaft running through the hole in the thrust washer; she preferably runs with the bike.

A preferred thrust washer is preferably essentially perpendicular to the axial direction of the shaft or of the wheel. a preferred thrust washer comprises or consists of metal, preferably steel, for example material 1.4310 according to DIN EN10088-3. The surface of a preferred thrust washer is at least in the area in which another object, preferably a part of the wheel, runs against the thrust washer, or the gear housing unit, with a friction-optimized, preferably a chrome surface. As a result, the friction between the wheel and the thrust washer can advantageously be reduced. In one version, the entire thrust washer is chrome-plated. A preferred thrust washer comprises steel, particularly preferably chrome-plated steel. In a further possible embodiment, the thrust washer comprises or consists of a non-metallic material, preferably ceramic, for example zirconium oxide.

In a preferred embodiment of the invention, the elastic polymer element is ring-shaped. The shaft axis preferably runs through the hole of the annular elastic polymer element. The elastic polymer element is preferably arranged in a groove, e.g. a groove of the wheel, a thrust washer or the housing body, particularly preferably the housing cover. The elastic polymer element is preferably essentially perpendicular to the axial direction of the shaft or of the wheel. It is an achievable advantage of this embodiment of the invention that the elastic polymer element can be supported on opposite sides of the shaft axis or evenly spaced all around on the thrust washer. In this way, one-sided component loading can advantageously be counteracted.

The preferred transmission housing unit has, at least in the relaxed state of the elastic polymer element, one or more free spaces in which the elastic polymer element is / are can evade through deformation when it yields elastically to the thrust washer. This embodiment of the invention is based on the knowledge of the inventors that the use of elastic polymer elements, especially in comparison to conventional metal springs, can simplify the construction of the gear housing unit according to the invention and the gear unit according to the invention because it gives the designer more leeway in the design of cavities in which the elastic polymer element can evade by deformation when it yields elastically to the thrust washer.

The or at least one of the free spaces, particularly preferably all free spaces, is or are arranged such that the elastic polymer element can deflect into the free space by deformation in a direction essentially perpendicular to the axial direction of the shaft when it yields elastically to the thrust washer. However, the invention also includes embodiments in which the polymer element can, alternatively or additionally, yield into the free space in one direction essentially in the axial direction of the shaft when it yields elastically to the thrust washer. In one embodiment of the invention, this free space or these free spaces are formed by the elastic polymer forming the space between the elements on which it is supported, e.g. B. the thrust washer and the wheel, not completely filled.

Alternatively or additionally, the thrust washer has, in the area in which it is supported on the elastic polymer element, the or at least one of the free spaces, particularly preferably all the free spaces, into which the elastic polymer element can deform when it yields elastically to the thrust washer . A sloping free space can be formed, for example, by a notch in a surface in the area in which the thrust washer is supported on the elastic polymer element. The notch is preferably annular; several, preferably ring-shaped notches can also be provided. The notch can have a V-shaped or rectangular cross-section, for example. Alternatively or additionally, the free space or at least one of the free spaces or all free spaces can be formed by a sloping design, for example a bevel, of the edge of the thrust washer.

The shape of the polymer element and of the free space (s) can determine the force-displacement characteristic of the elastic polymer element. In a preferred embodiment of the invention, the polymer element and the free space (s) are set up and arranged in such a way that the elastic polymer element has a force-displacement characteristic that is at least partially non-linear. In this context, “at least in sections” means that the force-displacement characteristic is non-linear in at least one section. In other words, the spring constant of the polymer element is not constant in this section or these sections, but varies with increasing compression of the polymer element. In a particularly preferred embodiment of the invention, the spring constant increases with increasing compression of the polymer element. The slope of the force-displacement characteristic, that is to say its mathematical first derivation, is preferably positive and monotonically increasing.

In a preferred embodiment of the invention, the elastic polymer element can essentially completely fill the free space or spaces during operation of the gear unit in such a way that it can essentially no longer yield elastically; this case, too, is subsumed under the case of a non-linear force-displacement characteristic in the context of the present invention. The embodiment of the invention makes use of the effect that an elastic polymer hardens when it no longer has any more space available into which it can move through deformation. The fact that the elastic polymer element can “essentially” no longer give way elastically means that the spring constant of the polymer element is at least doubled, particularly preferably at least fivefold, particularly preferably at the moment the space or spaces are filled, compared to the spring constant shortly before filling at least tenfold. This takes into account in particular that, for structural reasons, for example to simplify the design, the free space is not necessarily completely closed or cannot be completely filled.

A suitable polymer of the elastic polymer element is, for example, Delrin 100 NC010. The spring constant of the elastic polymer element should, on the one hand, have a certain minimum size in order to effect sufficient compensation for play. The spring constant is preferably greater than 10 N / mm (Newtons per millimeter), particularly preferably greater than 20 N / mm, particularly preferably even greater than 50 N / mm.

On the other hand, the spring constant of the elastic polymer element should not exceed a certain maximum value so that the gear unit can be easily assembled. The spring constant is preferably less than 750 N / mm, particularly preferably less than 500 N / mm, particularly preferably even less than 100 N / mm, in the pretensioned state after assembly of the gear unit but without additional axial loading.

In the case of the preferred transmission housing unit, the housing base body and the housing cover can be fastened to one another by means of threaded screws. Preferably at least two, particularly preferably at least 3, threaded screws are provided. The housing cover preferably has through holes through which the threaded screws can protrude. The housing base preferably has holes into which the threads of the threaded screws can be screwed in order to fasten the housing cover to the threaded base.

The transmission housing unit is preferably developed into a transmission unit which, in addition to the transmission housing unit, has a shaft protruding into the transmission housing unit and a wheel arranged on the shaft within the transmission housing unit. The wheel is preferably designed as a worm wheel which, particularly preferably, meshes with a worm that can be driven by an electric motor.

Figure list

Further advantageous configurations are described in more detail below with reference to several exemplary embodiments shown in the drawings, to which the invention is not limited, however.

• 1 eine perspektivische Explosionsansicht der erfindungsgemäßen Getriebeeinheit mit einer erfindungsgemäßen Getriebegehäuseeinheit; und
• 2 eine Querschnittsansicht der Getriebeeinheit der 1.
• 3 in Querschnittsansicht des elastischen Ausweichens elastischer Polymerelemente in einen durch einen Vorsprung modifizierten Freiraum.

It shows schematically:

• 1 a perspective exploded view of the gear unit according to the invention with a gear housing unit according to the invention; and
• 2 a cross-sectional view of the gear unit of FIG 1 .
• 3 a cross-sectional view of the elastic evasion of elastic polymer elements into a free space modified by a projection.

Detailed description of embodiments of the invention

In the following description of preferred embodiments of the present invention, the same reference symbols designate the same or comparable components. If there are several identical components, only one is usually provided with a reference number.

In the 1 and 2 illustrated gear unit 1 consists essentially of a gear housing unit, one of a flange 2 attachable electric motor 14th drivable drive shaft 15th , a worm gear mounted within the gear housing unit, of which in particular the worm wheel 3 is shown, and an output shaft projecting through the transmission housing unit 4th of the worm gear.

The output shaft 4th is designed in the present embodiment as a spindle and can be used in particular to adjust moving parts in motor vehicles. The output shaft 4th represents a shaft in the sense of the present invention. The axis of the drive shaft 15th is to the axis of the output shaft 4th essentially offset by 90 °.

The gear housing unit is formed by a housing body consisting of a housing base body 5 and a housing cover 6th , both made of plastic, inside a space for the worm gear. The housing body 5 and the housing cover 6th are connected to one another via four threaded screws (not shown). The housing cover 6th four through holes, and in the housing body 5 there are four corresponding holes into which the threads of the threaded screws can be screwed. In the present embodiment, the worm gear is made up of one on the drive shaft 15th trained snail 16 formed with the worm wheel 3 combs. The worm wheel 3 is on the output shaft 4th arranged and transmits the movement of the screw 16 on the output shaft designed as a spindle 4th . The axial play of the worm wheel 3 is to be compensated for by the measures described in more detail below.

The housing body 5 of the housing body has a to the outer diameter of the output shaft 4th matched through hole 8th on. The housing cover has a similar feature 6th one with the through hole 8th of the housing body 5 Corresponding through hole so that the output shaft 4th the gear housing unit can protrude through and can be stored in it in such a way that it protrudes from the gear housing unit on both sides.

Between the worm wheel 3 and the housing cover 6th there is a thrust washer 9 on one side of which is part of the worm wheel 3 supports. The thrust washer 9 does not turn with the worm wheel 3 with, but is stationary relative to this, that is, the worm wheel 3 runs against the thrust washer 9 at. The thrust washer 9 is made of steel that is coated with chrome to reduce the friction of the worm wheel 3 on the thrust washer 9 to reduce. The shaft base is supported on the other side 18th a turnbuckle 12th on the thrust washer 9 away.

The through hole of the housing cover 6th is with an internal thread 19th equipped to which the external thread 20th the tensioning screw 12th forms the mating thread, so that the clamping screw 12th in the housing cover 6th is rotatable, and by rotating in the axial direction of the output shaft 4th can be moved. The mating thread 20th extends essentially over the entire length of the outside of the clamping screw 12th . The clamping screw is designed as a hollow cylinder, and the output shaft 4th penetrates the interior of the hollow cylinder.

The tension screw 12th has no head. At the end of the turnbuckle 12th that is the end with which the tensioning screw 12th on the thrust washer 9 supported, opposite, there is a pair of diametrically opposite slots 21 . Here a tool can be attached to the clamping screw 12th to turn.

The gear housing unit also has an annular resilient polymer element 10 to compensate for axial play. The elastic polymer element 10 relies on that of the tensioning screw 12th remote side of the worm wheel 4th away. This is what the worm wheel 4th an attachment plate on this side 11 on which the elastic polymer element 10 can be reliably applied. In order not to slip, the elastic polymer element sits 10 partly in a flat annular groove in the contact plate 11 . The other side of the elastic polymer element 10 is supported by another thrust washer 13th which are in turn on the housing body 5 supported by being on an inner wall of the housing body 5 starts up. Attachment plate 11 , elastic polymer element 10 and the other thrust washer 13th are ring-shaped. They are essentially perpendicular to the output shaft 4th arranged, and the output shaft 4th runs through the inside of the ring.

In the 3a until 3f is a through an annular protrusion 22nd modified free space 21 shown. The consequence of the 3a until 3c shows how a polymer element 10 with a round cross-section and the consequence of 3a until 3c like a polymer element 10 with a rectangular cross-section deforms while the thrust washer 13th the attachment plate 11 approaching. The lead 22nd has the consequence that the spring constant of the polymer element 10 when it reaches the protrusion by deformation, it increases. In this way it is achieved that the force-displacement characteristic of the polymer element 10 becomes steeper at this point.

For assembling the gear unit 1 becomes, among other things, the tensioning screw 12th into the through hole of the housing cover 6th partially screwed in. In addition, the elastic polymer element 10 and the thrust washers 13th and 9 on the worm wheel 3 put on and the worm wheel 3 into the through opening 7th of the housing cover 6th used. Then the case cover 6th with the housing body 5 against the force of the elastic polymer element 10 pressed together and the two components are screwed together with the threaded screws. This is the elastic polymer element 10 preloaded and compressed to a small extent.

In the subsequent assembly step, a tool is attached to the pair of slots 17th the tensioning screw 12th attached to rotate them in such a way that they are in the axial direction of the output shaft 4th moved towards the inside of the gearbox housing. This becomes the elastic polymer element 10 further biased.

The worm wheel 3 is in operation of the gear unit by the force of the elastic polymer element 10 in the direction of the housing body 5 pressed where the other thrust washer 13th is arranged. Depending on the direction of travel of the gear, this force is increased, which leads to a further compression of the elastic polymer element 10 leads, or the gearbox generates an opposing force, that is, a force that the worm wheel 3 in the direction of the housing cover 6th against the clamping screw 12th urges.

After the gear unit has been installed 1 becomes the tensioning screw 12th screwed in to a predetermined amount. This can preferably be done using a force displacement measurement. After the preload of the system has been set to the correct value for the operation of the gear unit, the tensioning screw 12th secure against rotation with respect to the housing cover 6th fixed. This can be done, for example, by thermal methods (in particular fusing, for example by means of a hot stamp, or welding, for example by means of a laser, to the housing cover), chemical methods (in particular gluing to the housing cover) or mechanical methods (in particular adjustment with the housing cover).

The features disclosed in the above description, the claims and the drawings can be important both individually and in any combination for the implementation of the invention in its various embodiments.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 102008043904 A1 [0002]
• DE 102011077584 A1 [0003]
• WO 2018215010 A1 [0004]

Claims (17)

Gear housing unit which can accommodate at least part of a shaft (4) or a wheel (3) arranged on a shaft (4) and which has a housing body (5, 6) with an elastic polymer element (10) to compensate for axial play between the shaft (4) or the wheel (3) and the housing body (5, 6), characterized in that a clamping screw (12), the shaft bottom of which is supported on the thrust washer (9), is rotatably arranged in a thread of the housing body (5, 6) and the bottom of the shaft of the clamping screw can be moved in the axial direction of the shaft (4) by turning the clamping screw (12). Gear housing unit according to Claim 1 , characterized in that part of the shaft (4) or of the wheel (3) can be supported on the thrust washer (9). Gear housing unit according to Claim 1 or 2 , characterized in that the housing body (5, 6) has a housing base body (5) and a housing cover (6). Gear housing unit according to Claim 3 , characterized in that the clamping screw (12) is arranged in a thread of the housing cover (6). Gear housing unit according to one of the preceding claims, characterized in that the clamping screw (12) comprises plastic. Gear housing unit according to one of the preceding claims, characterized in that the elastic polymer element (10) is ring-shaped. Gearbox housing unit according to one of the preceding claims, characterized in that the elastic polymer element (10) is supported on a thrust washer which is supported on the housing body (5, 6). Gearbox housing unit according to one of the preceding claims, characterized in that the elastic polymer element (10) is supported on a part of the shaft (4) or the wheel (3). Gearbox housing unit according to one of the preceding claims, characterized in that, at least in the relaxed state of the elastic polymer element (10), it has at least one free space (13) into which the elastic polymer element (10) can evade by deformation when it touches the thrust washer (9) yields elastically. Gear housing unit according to Claim 9 , characterized in that the free space (21) is arranged in such a way that the elastic polymer element (10) can escape into the free space (13) by deformation in a direction essentially perpendicular to the axial direction of the shaft when it is elastic against the thrust washer (9) gives way. Gear housing unit according to Claim 9 or 10 , characterized in that the polymer element (10) of the at least one free space (21) is set up in such a way that the elastic polymer element (10) has a force-displacement characteristic that is at least partially non-linear. Gearbox housing unit according to one of the preceding claims, characterized in that the clamping screw (12) has a through hole (7) through which the shaft (4) extends. Gearbox housing unit according to one of the preceding claims, characterized in that the housing base body (5) and the housing cover (6) can be fastened to one another by means of threaded screws. Gearbox housing unit according to one of the preceding claims, characterized in that the clamping screw (12) is permanently connected to the housing cover (6). Gear unit (1) with a gear housing unit according to one of the preceding claims, a shaft 4 protruding into the gear housing unit and a wheel (3) arranged on the shaft (4) within the gear housing unit. Gear unit (1) Claim 15 , characterized in that the elastic polymer element (10) is pretensioned against the thrust washer (9). Gear unit (1) Claim 15 or 16 , characterized in that the wheel (3) is designed as a worm wheel which meshes with a worm that can be driven by an electric motor.

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