CN113324013A

CN113324013A - Transmission housing unit and transmission unit

Info

Publication number: CN113324013A
Application number: CN202110212552.9A
Authority: CN
Inventors: 建·杨; 马克思·施温
Original assignee: Nedec Electric Motors And Drives Germany Ltd
Current assignee: Nedec Electric Motors And Drives Germany Ltd
Priority date: 2020-02-28
Filing date: 2021-02-25
Publication date: 2021-08-31
Also published as: DE102020105411A1

Abstract

The invention relates to a gear housing unit which can accommodate at least a part of a shaft (4) or a wheel (3) arranged on the shaft (4) and has a housing body (5, 6) having an elastic polymer element (10) for axial clearance compensation between the shaft (4) or the wheel (3) and the housing body (5, 6) and a stop disk (9), characterized in that a clamping screw (12) is arranged rotatably in the thread of the housing body (5, 6), the column base of which is supported at the stop disk (9) and can be moved in the axial direction of the shaft (4) by rotation of the clamping screw (12). The invention also relates to a gear unit (1) having a gear housing unit, a shaft (4) projecting into the gear housing unit, and a wheel (3) arranged on the shaft (4) in the gear housing unit.

Description

Transmission housing unit and transmission unit

Technical Field

The invention relates to a gear housing unit which can accommodate at least a part of a shaft or a wheel arranged on the shaft and has a housing body with elements for axial play compensation between the shaft or the wheel and the housing body. The invention also relates to a gear unit having a gear housing unit.

Background

DE 102008043904 a1 discloses a device for supporting a linear drive with two screws, the linear drive comprising a motor at a gear having a gear housing. The gear housing has a cylindrical sleeve in which the worm wheel is radially supported. The axial support is realized by means of a bearing race, wherein a wave spring for gap compensation is arranged between the sleeve and the bearing race. Two openings at the transmission housing form bolt receiving portions. 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 apart from the outside of the gear housing and therefore the bearing section outside the gear housing is arranged as a bearing for the linear drive.

DE 102011077584 a1 discloses an adjusting device comprising a spindle and a worm wheel, wherein the worm wheel is coupled to a drive unit via an external toothing. The worm wheel has an internal thread which meshes with the external thread of the spindle and a housing which accommodates the worm wheel, wherein the housing is formed in two parts from 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 for clearance compensation at the worm gear. The spring element is located between the worm gear and the first axial bearing surface of the housing.

WO 2018215010 a1 discloses a servo drive for a motor vehicle, which has a housing consisting of a housing shell and a housing cover, and an electric drive, by means of which an actuating element (stellmitel) can be moved. The adjusting means is moved via a spindle drive, wherein the spindle is held in the bearing receptacle under pretensioning. The pretensioning is generated by means of a spring element inserted into the housing. The spring element is clamped between the projections of the ribs of the housing and the axial end of the worm wheel acts on the spring element.

Disclosure of Invention

The object of the invention is to provide an improved transmission housing unit which can accommodate at least a part of a shaft or a wheel arranged on the shaft and has a housing body with elements for axial play compensation between the shaft or the wheel and the housing body. In particular, the invention is intended to make it possible to achieve simple assembly of the transmission housing unit and satisfactory axial play compensation when using commercially available elastic polymer elements. It is also an object of the invention to provide an improved transmission unit with a transmission housing unit.

In the following, any reference to one (whether by the definite article or not), two or another number of items is understood not to exclude the presence of other such items, unless the contrary is indicated. Reference signs in all claims shall not be construed as limiting but shall only improve the legibility of the claims.

This object is achieved by the transmission housing unit described below. The gear housing unit can accommodate at least a part of the shaft or of the wheel supported on the 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. A clamping screw is rotatably arranged in the thread of the housing body, a column bottom of the clamping screw is supported at the stop disk, and the column bottom of the clamping screw is movable in the axial direction of the shaft by rotation of the clamping screw.

The invention is also based on the recognition that, for example, when the wheel is a worm wheel of a worm gear, considerable forces can act axially on the elastic polymer element of a gear housing unit of this type. In this case, in order to effectively limit the axial gap, an elastic polymer element having a high elastic constant must be used. However, when the elastic polymer element has to be pretensioned and the assembly worker or the assembly robot cannot apply a force or only with difficulty to overcome the necessary pretensioning force of the elastic polymer element, the assembly of such a transmission housing unit with the shaft into a transmission unit can be difficult.

The elastic polymer element can also be pretensioned or further pretensioned after assembly of the gear unit by means of the clamping screw according to the invention, more precisely by turning the clamping screw such that the column base of the clamping screw is moved in the direction of the interior of the gear unit housing unit. The transmission unit can therefore advantageously be assembled even in the case of elastic polymer elements having a high elastic constant. The elastic polymer element is not prestressed during assembly but only after assembly, or the elastic polymer element is prestressed to a lesser extent during assembly and is prestressed further after assembly.

The invention comprises the following steps: an embodiment in which the transmission housing unit completely houses the shaft or wheel; the gear housing unit only partially accommodates an embodiment of the shaft or wheel, for example only one section of the shaft or wheel. The invention comprises the following steps: an embodiment in which the clamping screw is supported directly at the stop disk; an embodiment in which the clamping screw is supported at the stop disk indirectly via a further element.

According to the invention, an "elastic polymer" is an elastically deformable plastic, also referred to as "elastomer". The elastic polymer element according to the invention is predominantly, i.e. up to more than 50%, preferably up to more than 90%, particularly preferably up to more than 99% or even completely composed of one or more elastic polymers. The elastic polymer element may be reinforced in one or more directions by fibres, such as glass fibres or carbon fibres.

"axial clearance compensation" according to the invention means that the clearance of the shaft and/or the wheel is limited in the axial direction of the shaft. Particularly preferably, the wheel or the shaft or a part thereof is stopped at the stop disk, but the invention also includes embodiments in which the clamping screw is stopped at the stop disk. By "stop" according to the invention is meant that the shaft or wheel or a part thereof or the elastic polymer element or the stop can be supported axially at the stop disk, but the shaft and/or wheel can continue to rotate about its axis here.

The object of the invention is also achieved by the transmission unit described below. The gear unit comprises a shaft projecting into the gear housing unit and a wheel arranged within the gear housing unit.

The dependent claims and the following description describe advantageous embodiments and refinements which can be used individually or in combination with one another.

The preferred housing body has threads and the post of the clamp screw preferably has matching mating threads so that the clamp screw can be rotated in the threads for axial movement along the shaft.

In a preferred gear housing unit, a part of the shaft or wheel can be supported at the stop disk, particularly preferably the part of the shaft or wheel can be stopped at the stop disk.

The preferred housing body includes a housing base and a housing cover. Advantageously, the housing cover can facilitate the assembly of the gear housing unit and the gear unit. Advantageously, the housing cover can be used together with the housing base of the gear housing unit to protect the components arranged therein from mechanical damage or contamination. Preferably, the housing base and the housing cover are formed from the same material. A preferred material for the housing body, the housing base and/or the housing cover is plastic. Preferred plastics are polyamide and glass fibre reinforced plastics, for example PA66 GF 50. Advantageously, the housing body can be produced from a plastic material in a particularly simple and/or inexpensive manner.

Preferably, the clamping screw is arranged in a thread of the housing cover of the housing body. The preferred material for the clamping screw is plastic. Preferred plastics are polyamide and glass fibre reinforced plastics, for example PA66 GF 50. Preferably, the clamping screw is formed from the same material as the gear housing or housing cover. An achievable advantage of the plastic material may be that the clamping screw has an inherent elasticity. In this way, the stop can be slightly bent in the event of a high force acting axially on the stop and damage to the gear unit is thereby prevented.

In a preferred transmission unit, the elastic polymer element is directly or indirectly prestressed against the stop disk. The stop disk can be a stop disk on which the clamping screw is also supported, or another stop disk, preferably on the opposite side of the housing. The elastic polymer element of the preferred transmission unit is supported at its side facing away from the stop disk at the housing body or at a part of the shaft or of a wheel arranged on the shaft, so that the elastic polymer element is preferably pretensioned between the stop disk on the one side and the housing body or the wheel or the shaft on the other side.

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 from the housing body and thus from the transmission housing unit on both sides; in other words, the shaft may pass 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-opening 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 post of the clamping screw. In other words, the preferred clamping screw is designed as a hollow cylinder, wherein a mating thread is provided on the outside of the cylinder. In this embodiment of the invention, the column base of the clamping screw is designed as a ring through which the shaft extends and which is supported directly or indirectly at the stop disk. The preferred clamping screw is coaxial with at least one of the through-holes of the housing, so that the shaft also extends through the through-hole of the housing in which the clamping screw is arranged in such a way that it extends through the through-hole of the clamping screw.

The preferred clamping screw has no head. Particularly preferably, the clamping screw has a thread extending over substantially the entire length of the outer surface of the bolt.

On the side directed outwards with reference to the housing, the clamping screw is provided with one or more slots or projections onto which a tool can be placed in order to turn the clamping screw. It is particularly preferred to provide two oppositely opposed slots. The clamping screw is preferably connected to the housing cover in a non-releasable manner.

The stop disk at the bottom of the preferred support column is annular, wherein the shaft extends through the hole of the annular stop disk; the stop disk is preferably stationary relative to the rotating wheel, which means that the wheel stops at the stop disk. The preferred stop disc supporting the resilient polymeric member is annular, with the shaft extending through the aperture of the stop disc; the stop disc preferably runs together with the wheel.

The preferred stop disc is preferably substantially perpendicular to the axial direction of the shaft or wheel. Preferred stop discs comprise or are made of metal, preferably steel, for example material 1.4310 according to DIN EN 10088-3. The outer surface of the preferred stop disk is equipped with a friction-optimized, preferably chrome-outer surface at least in the region in which another object, preferably a part of the wheel, comes to a stop at the stop disk, or the transmission housing unit is equipped with a friction-optimized, preferably chrome-outer surface. Friction between the wheel and the stop disk can thereby advantageously be reduced. In one embodiment, the entire stopper disk is chrome plated. Preferred stop discs comprise steel, particularly preferably chrome-plated steel. In another possible embodiment, the stop disk comprises or is made of a non-metallic material, preferably a ceramic, such as zirconia.

In a preferred embodiment of the invention, the elastic polymer element is ring-shaped. Preferably, the axis of the shaft extends through the bore of the annular resilient polymeric element. Preferably, the elastic polymer element is arranged in a groove, for example a wheel, a stop disc or a groove of the housing body, particularly preferably of the housing cover. The elastic polymer element is preferably substantially perpendicular to the axial direction of the shaft or wheel. An achievable advantage of this embodiment of the invention is that the elastic polymer element can be supported on opposite sides of the axis of the shaft or completely (rundium) in a uniformly spaced manner on the stop disk. Advantageously, in this way, unilateral component loads can be overcome.

The preferred gear housing unit has one or more free spaces at least in the relaxed state of the elastic polymer element, into which the elastic polymer element can be transferred by deformation when the elastic polymer element elastically yields to the stop disk. The described embodiments of the invention are also based on the recognition of the inventors that the use of an elastic polymer element makes it possible to simplify the construction of the transmission housing unit according to the invention and of the transmission unit according to the invention, in particular in comparison with conventional metal springs, since this construction leaves more room for the designer when designing a cavity into which the elastic polymer element can be transferred by deformation when it elastically yields to the stop disk.

The free space or at least one of the free spaces, particularly preferably all of the free spaces, is arranged such that the elastic polymer element can be transferred into the free space in a direction substantially perpendicular to the axial direction of the shaft by deformation when the elastic polymer element elastically yields to the stop disc. The invention also includes embodiments in which the polymer element can be displaced into the free space alternatively or additionally in a direction substantially axial to the shaft when the polymer element elastically yields to the stop disk. In one embodiment of the invention, the free space or free spaces are formed in such a way that the elastic polymer does not completely fill the intermediate space between the element on which the elastic polymer is supported, for example the stop disc, and the wheel.

Alternatively or additionally, the stop disk has, in its region supported on the elastic polymer element, at least one, particularly preferably all, of said free spaces or said free spaces, into which the elastic polymer element can be transferred by deformation when it elastically yields to the stop disk. Such a free space can be formed, for example, by a recess in the face in the region of the stop disk bearing against the elastic polymer element. The recess is preferably annular; a plurality of, preferably annular, recesses may also be provided. The recess may for example have a V-shaped or rectangular cross-section. Alternatively or additionally, the free space or at least one or all of the free spaces can be formed by an inclined design (ausfuhrung), for example a chamfer, of the edge of the stop disk.

The shape of the polymer element and the one or more free spaces may determine the force versus stroke characteristic of the elastic polymer element. In a preferred embodiment of the invention, the polymer element and the one or more free spaces are configured and arranged such that the elastic polymer element has an at least partially non-linear force-travel characteristic curve. By "at least partially" is meant that the force/stroke characteristic is non-linear in at least one section. In other words, the elastic constant of the polymer element is not constant in the at least one section, 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 polymeric element. Preferably, the slope of the force-travel characteristic curve, i.e. the mathematical first derivative thereof, increases monotonically in the positive direction.

In a preferred embodiment of the invention, the elastic polymer element can substantially completely fill one or more free spaces during operation of the transmission unit, so that the elastic polymer element can substantially no longer be elastically displaced; this is also included in the case of non-linear force/travel characteristic curves in the sense of the present invention. The design according to the invention makes use of the effect that the elastic polymer hardens when no space is available anymore for the elastic polymer to continue to be displaced by deformation. The elastic polymer element being "substantially" unable to further elastically transfer means that the elastic constant of the polymer element at the moment of filling up the free space or free spaces is at least doubled, particularly preferably at least five times, particularly preferably at least ten times, compared to the elastic constant immediately before filling up. It is thereby particularly conceivable that for structural reasons, for example to simplify the construction, the free space does not have to be completely enclosed or can be filled.

A suitable polymer for the elastic polymer element is for example Delrin 100NC 010. The elastic constant of the elastic polymer element should on the one hand have a certain minimum value in order to achieve a sufficient gap compensation. Preferably, the spring constant is greater than 10N/mm (newtons per millimeter), particularly preferably greater than 20N/mm, particularly preferably even greater than 50N/mm.

On the other hand, the elastic constant of the elastic polymer element should not exceed a certain maximum value in order to be able to assemble the transmission unit in a simple manner. Preferably, the spring constant in the pretensioned state after assembly of the transmission unit, but without additional axial load, is less than 750N/mm, particularly preferably less than 500N/mm, particularly preferably even less than 100N/mm.

In a preferred gear 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 three, threaded screws are provided. The housing cover preferably has a through-hole through which a threaded screw can pass. The housing base preferably has bores into which the threads of a threaded screw can be screwed in each case in order to fasten the housing cover to the threaded base.

The gear housing unit is preferably designed as a gear unit which, in addition to the gear housing unit, also has a shaft which projects into the gear housing unit and a wheel which is arranged on the shaft within the gear housing unit. The wheel is preferably designed as a worm wheel, which particularly preferably meshes with a worm which can be driven by a motor.

Drawings

Further advantageous embodiments are described in detail below with reference to a plurality of exemplary embodiments shown in the drawings, to which, however, the invention is not restricted.

Schematically shown in the drawings:

fig. 1 shows a perspective exploded view of a transmission unit according to the invention with a transmission housing unit according to the invention; and

fig. 2 shows a cross-sectional view of the transmission unit of fig. 1.

Fig. 3a to 3f show cross-sectional views of an elastic polymer element elastically transferred to a free space altered by a protrusion.

Detailed Description

In the following description of the preferred embodiments of the present invention, identical or similar components are denoted by the same reference numerals. In the case of a plurality of identical components, usually only one component is provided with a reference numeral.

The gear unit 1 shown in fig. 1 and 2 essentially comprises a gear housing unit, a drive shaft 15 which can be driven by an electric motor 14 which can be built on the flange 2, a worm gear (in which the worm wheel 3 is shown) which is mounted in the gear housing unit, and an output shaft 4 of the worm gear which passes through the gear housing unit.

The output shaft 4 is designed in the present exemplary embodiment as a screw and can be used in particular for adjusting movable components in a motor vehicle. The output shaft 4 is a shaft in the sense of the present invention. The axis of the drive shaft 15 is offset by substantially 90 ° with respect to the axis of the output shaft 4.

The transmission housing unit forms an accommodation space for the worm gear transmission in its interior by means of a housing body consisting of a housing base body 5 and a housing cover 6, which are both made of plastic. The housing base 5 and the housing cover 6 are connected to each other via four threaded screws (not shown). For this purpose, the housing cover 6 has four through-openings and there are four corresponding openings in the housing base 5 into which the threads of the threaded screws can be screwed. The worm gear mechanism is formed in the present embodiment by a worm 16 which is formed on the drive shaft 15 and meshes with the worm wheel 3. The worm wheel 3 is arranged at the output shaft 4 and transmits the movement of the worm 16 to the output shaft 4, which is designed as a lead screw. The axial play of the worm wheel 3 is compensated for by measures which are described in more detail below.

The housing base 5 of the housing body has a through hole 8 matching the outer diameter of the output shaft 4. In a similar manner, the housing cover 6 has a through-opening corresponding to the through-opening 8 of the housing base body 5, so that the output shaft 4 can be passed through the gear housing unit and can be mounted therein in such a way that it projects to both sides from the gear housing unit.

A stop disk 9 is arranged between the worm wheel 3 and the housing cover 6, a part of the worm wheel 3 being supported on one side of said stop disk. The stop disk 9 does not rotate with the worm wheel 3 but is stationary relative to the worm wheel, which means that the worm wheel 3 stops at the stop disk 9. The stop disk 9 is made of steel coated with chromium in order to reduce the friction of the worm wheel 3 at the stop disk 9. The column base 18 of the clamping screw 12 is supported on the other side at the stop disk 9.

The through-hole of the housing cover 6 is equipped with an internal thread 19, against which an external thread 20 of the clamping screw 12 forms a counter-thread, so that the clamping screw 12 can be rotated in the housing cover 6 and by rotation can be moved in the axial direction of the output shaft 4. The counter thread 20 extends substantially over the entire length of the outer side of the clamping screw 12. The clamping screw is designed as a hollow cylinder and the output shaft 4 passes through the interior of the hollow cylinder.

The clamping screw 12 has no head. A pair of oppositely situated slots 17 is provided at the end of the clamping screw 12 opposite the end with which the clamping screw 12 is supported at the stop disk 9. A tool may be used to turn the clamping screw 12.

The gear housing unit also has an annular elastic polymer element 10 for axial play compensation. The elastic polymer element 10 is supported on the side of the worm wheel 4 facing away from the clamping screw 12. For this purpose, the worm wheel 4 has a support plate 11 on the side, against which the elastic polymer element 10 can be reliably placed. In order not to slip off, the elastic polymer element 10 is partly located in a shallow flat annular groove of the support plate 11. The other side of the elastic polymer element 10 is supported on a further stop disk 13, which is supported by its stop on the inner wall of the housing base body 5 and in turn on the housing base body 5. The support plate 11, the elastic polymer element 10 and the further stop disk 13 are of annular design. They are arranged substantially perpendicularly to the output shaft 4, and the output shaft 4 accordingly extends through the ring interior.

Fig. 3a to 3f show the free space 21 modified by the annular projection 22. The sequence of fig. 3a to 3c shows how a polymer element 10 with a circular cross section is deformed during the approach of the stop disc 13 to the support plate 11, while the sequence of fig. 3d to 3f shows how a polymer element 10 with a rectangular cross section is deformed during the approach of the stop disc 13 to the support plate 11. The projections 22 are such that the spring constant of the polymer element 10 increases when the polymer element reaches the projections by deformation. In this way, it is achieved that the force-travel characteristic curve of the polymer element 10 becomes steeper at this point.

In particular, to assemble the gear unit 1, the clamping screw 12 is screwed partially into the through hole of the housing cover 6. Furthermore, the elastic polymer element 10 and the

stop disks

13 and 9 are placed on the worm wheel 3 and the worm wheel 3 is inserted into the opening of the housing cover 6

7 (c). The housing cover 6 is then pressed together with the housing base body 5 against the force of the elastic polymer element 10 and the two components are screwed together with threaded screws. The elastic polymer element 10 is thereby pretensioned to a lesser extent and compressed.

In the next assembly step, a tool is placed onto the pair of slots 17 of the clamping screw 12 in order to turn the clamping screw in such a way that it moves in the direction of the inside of the transmission housing in the axial direction of the output shaft 4. Thereby causing the elastic polymer element 10 to be further pre-tensioned.

During operation of the gear unit, the worm wheel 3 is pressed by the force of the elastic polymer element 10 in the direction of the housing base body 5 at the location of the other stop disk 13. Depending on the direction of operation of the gear, the force is also intensified, which causes a further compression of the elastic polymer element 10, or the gear generates an opposite force, i.e. a force pushing the worm wheel 3 against the clamping screw 12 in the direction of the housing cover 6.

After the assembly of the gear unit 1 has been completed, the clamping screw 12 is screwed in to a predetermined extent. This can preferably be achieved via force travel measurements. After the pretension of the system has been adjusted to a value that is appropriate for the operation of the gear unit, the clamping screw 12 is fixed in a rotationally fixed manner relative to the housing cover 6. This can be achieved, for example, by thermal methods (in particular welding to the housing cover, for example by hot stamping, or welding to the housing cover, for example by laser), chemical methods (in particular gluing to the housing cover), or mechanical methods (in particular locking to the housing cover (vertellen)).

It is important for the invention to be implemented in different embodiments that the features disclosed in the above description, the claims and the drawings can be used both individually and in any combination.

Claims

1. A transmission housing unit which can accommodate at least a part of a shaft (4) or a wheel (3) arranged on the shaft (4) and has a housing body (5, 6) with an elastic polymer element (10) for axial clearance compensation between the shaft (4) or the wheel (3) and the housing body (5, 6) and a stop disk (9), characterized in that a clamping screw (12) is arranged rotatably in the thread of the housing body (5, 6), the base of which is supported at the stop disk (9) and which can be moved in the axial direction of the shaft (4) by rotation of the clamping screw (12).

2. Transmission housing unit according to claim 1, characterized in that a part of the shaft (4) or the wheel (3) can be supported at the stop disc (9).

3. Transmission housing unit according to claim 1 or 2, characterized in that the housing body (5, 6) comprises a housing base body (5) and a housing cover (6).

4. Transmission housing unit according to claim 3, characterized in that the clamping screw (12) is arranged in a thread of the housing cover (6).

5. Transmission housing unit according to any one of the preceding claims, characterized in that the clamping screw (12) comprises plastic.

6. Transmission housing unit according to any of the preceding claims, characterized in that the elastic polymer element (10) is ring-shaped.

7. Transmission housing unit according to any one of the preceding claims, characterized in that the elastic polymer element (10) is supported at a stop disc which is supported at the housing body (5, 6).

8. Transmission housing unit according to any one of the preceding claims, characterized in that the elastic polymer element (10) is supported at a part of the shaft (4) or of the wheel (3).

9. Transmission housing unit according to one of the preceding claims, characterized in that the transmission housing unit has at least one free space (21) at least in the relaxed state of the elastic polymer element (10), into which the elastic polymer element (10) can be transferred by deformation when it elastically yields to the stop disc (9).

10. Transmission housing unit according to claim 9, characterized in that the free space (21) is arranged such that the elastic polymer element (10) can be transferred into the free space (21) by deformation in a direction substantially perpendicular to the axial direction of the shaft when the elastic polymer element elastically yielding to the stop disc (9).

11. Transmission housing unit according to claim 9 or 10, characterized in that the elastic polymer element (10) or the at least one free space (21) is configured such that the elastic polymer element (10) has an at least partially non-linear force-travel characteristic curve.

12. Transmission housing unit according to any one of the preceding claims, characterized in that the clamping screw (12) has a through hole (7) through which the shaft (4) extends.

13. Transmission housing unit according to one of the preceding claims, characterized in that the housing base body (5) and the housing cover (6) can be fixed to each other by means of threaded screws.

14. Transmission housing unit according to one of the preceding claims, characterized in that the clamping screw (12) is connected in a non-releasable manner with the housing cover (6).

15. A transmission unit (1) having a transmission housing unit according to any one of the preceding claims, a shaft (4) projecting into the transmission housing unit and a wheel (3) arranged on the shaft (4) within the transmission housing unit.

16. Drive unit (1) according to claim 15, characterized in that the elastic polymer element (10) is pretensioned against the stop disc (9).

17. Drive unit (1) according to claim 15 or 16, characterized in that the wheel (3) is configured as a worm wheel which meshes with a worm which can be driven by an electric motor.