EP4320011A1

EP4320011A1 - Adjustment assembly for an adjustment drive

Info

Publication number: EP4320011A1
Application number: EP22721003.6A
Authority: EP
Inventors: Jürgen SCHUKALSKI; Andreas DIEMAR; Peter Hausmann; Andreas Deckert; Hans-Jörg Birkefeld; Jochen Hofmann; Renee Dietzel; Kevin HERTHA; Jürgen HERGENRÖDER; Wolfgang Wachter
Original assignee: Brose Fahrzeugteile SE and Co KG
Current assignee: Brose Fahrzeugteile SE and Co KG
Priority date: 2021-04-09
Filing date: 2022-04-06
Publication date: 2024-02-14
Also published as: DE102021203552A1; CN117120297A; WO2022214511A1

Abstract

The invention relates to an adjustment assembly (1) for an adjustment drive of a motor vehicle, comprising a first adjustment part (2) having a first screw thread (202) and a second adjustment part (3) having a second screw thread (32), which is in engagement with the first screw thread (202), wherein at least one of the screw threads (202, 32) has a plastic coating (210, 30). The plastic coating (210, 30) covers more than 50% of the at least one screw thread. The invention also relates to a method for producing an adjustment part (2, 3) having a screw thread (202, 32) for an adjustment assembly.

Description

Adjustment assembly for an adjustment drive

description

The invention relates to an adjustment assembly for an adjustment drive of a motor vehicle according to the preamble of claim 1 and to a method for producing an adjustment part for the adjustment assembly according to claims 19 and 20.

Such an adjustment assembly includes a first adjustment part with a first thread and a second adjustment part with a second thread that engages with the first thread.

Usually, adjustment drives in motor vehicles that have an adjustment assembly according to the invention are used for longitudinal seat adjustment of a motor vehicle seat with an adjustment rail that is longitudinally adjustable relative to a rail fixed to the body. The first adjustment part is usually driven in rotation via external teeth by a drive worm connected to a drive device. The drive force is transmitted from the first adjustment part to the second adjustment part via the engagement of the threads of the first and of the second adjustment part, as a result of which the second adjustment part can be adjusted in a translatory manner. The translatory adjustment of the second adjustment part can bring about an adjustment of the adjustment rail relative to the rail fixed to the body. A spindle nut or a screw wheel is often used for the first adjustment part and a spindle for the second adjustment part. The adjustment assembly should be able to be operated with as little noise as possible during normal operation and should be designed to be able to absorb axial forces that occur, for example, in the event of a crash. It is known that adjustment parts made of plastic can be operated with little noise. However, plastic can be deformed in the event of a crash, so that the adjustment assembly can no longer be used after a crash. It is also known that adjustment parts made of steel can absorb axial forces that occur in the event of a crash. However, such adjustment parts can cause undesirable noises, such as squeaking, during normal operation.

In a spindle drive known from EP 2 396 191 B1, the spindle nut is formed by a hybrid spindle nut. This has a functional part made of plastic arranged in the power flow between the drive worm and the spindle and a strength part made of hard metal, which is designed to divert crash forces from the adjustment rail into the spindle. The functional part and the strength part are here arranged axially next to one another along the thread axis.

In an adjustment device known from WO 2016/150790, plastic has been introduced into the spindle nut to optimize noise. A double-threaded spindle nut has been proposed for this purpose, the first thread of which is made of steel and the second thread of which consists of a plastic, so that steel and plastic are arranged alternately next to one another in the axial direction.

The fact that at least one of the first and second threads has a plastic coating can reduce undesirable noise development during operation of the adjustment assembly and at the same time ensure that the at least one thread is highly resistant in the event of a crash.

In principle, there is a desire among manufacturers to reduce the weight and save installation space in an adjustment assembly. In addition, an adjustment assembly should be simple and inexpensive to produce with dimensions within the required tolerances.

The object of the present invention is to provide an improved adjustment assembly. According to a first aspect of the invention, this object is achieved by an object having the features of claim 1 . Accordingly, the plastic coating covers more than 50% of the at least one thread.

Having more than 50% plastic coverage of the at least one thread eliminates the likelihood of accidental contacts occurring between portions of the threads not covered with a plastic coating. Such undesired secondary contacts can be caused by the adjustment parts tilting relative to one another, which can produce undesired noises such as squeaking.

Tribological properties include, but are not limited to, friction between the first and second adjustment parts, wear of the adjustment assembly, efficiency that can be achieved when operating the adjustment assembly, and the amount of noise generated by the adjustment assembly during operation. Plastic can have lower sliding friction and/or static friction than metal. If the friction between the first and the second adjustment part is reduced, wear and tear on the adjustment assembly as a result of long-term operation can also be reduced. Reduced friction can also mean that less energy has to be used to operate the adjustment assembly, so that greater efficiency can be achieved. If metal adjustment parts are used, it may be necessary to use lubricants to ensure quiet operation. Plastic, on the other hand, can enable low-noise operation even without lubricants.

To improve the tribological properties, it is therefore provided that the plastic coating covers the at least one thread to a percentage of more than 50%. In particular, it can be advantageous for the percentage to be as far above 50% as possible. By covering the at least one thread with the plastic coating, an arrangement can be created on which, radially separated from one another, a functional element to improve the function, namely the plastic coating, and a strength element, namely the at least one thread, for example made of steel, to improve the strength are provided. This is an improvement over the prior art insofar as elements for the function and elements for the strength are known from it, which are axially separated, which is associated with an increased need for installation space. In the case of a radial separation, the adjustment part can be designed to be significantly shorter in its axial length. For example, a first adjustment part designed as a spindle nut is conceivable and possible, which is four to five times shorter than adjustment parts known from the prior art.

In order to create a simple and inexpensive production of the adjustment assembly with dimensions within the desired tolerances, it can be provided that the plastic coating covers the at least one thread to less than 100%. The fact that the plastic covering does not cover the at least one thread 100% can be due to the fact that the adjustment assembly was produced using the method for producing the adjustment assembly according to a second aspect of the invention. The details of the procedure will be discussed further below.

In one configuration, the plastic coating covers the at least one thread almost completely. In particular, the plastic coating can cover the at least one thread except for one revolution, between one and two revolutions, or up to a maximum of two revolutions of the at least one thread. For example, the at least one thread can be more than 80% covered with the plastic coating. A coverage of the at least one thread by the plastic coating can be between 80% and 99%, in particular between 80% and 90% or between 80% and 85%. Such coverings can optimize the tribological properties and at the same time enable simple and inexpensive manufacture. The percentages given can in particular relate to a length of the at least one thread.

The at least one thread can comprise a helically circumferential thread turn. A revolution of 360° along the helical thread is referred to in this text as one revolution of the thread. N revolutions consequently denote a revolution of N times 360° along the helical thread. A lowest point of the thread can be formed by a thread root and a highest point of the thread by a thread crest. The root of the thread and the crest of the thread can be connected via flanks. A shape of the thread root and the thread crest, for example flat or tapering to a point, and of the flank, for example steep or flat, can determine a profile of the at least one thread. A large number of combinations of thread crests, bases and flanks are conceivable and possible. Well-known examples of profiles are, for example, a trapezoidal profile in which the thread root and the thread crest are flat and are connected via sloping flanks that widen the thread in the direction of the thread crest, or a triangular profile in which the thread root and the thread crest are formed in a pointed shape and are also connected via sloping flanks that widen the thread in the direction of the thread crest. In a sectional view of the thread along the thread axis, the two flanks and the associated thread crest together form tooth-like projections, so that thread teeth of the at least one thread can also be mentioned below in order to characterize a profile of the at least one thread.

The fact that the at least one thread is covered by the plastic coating can mean that the thread pitch of the at least one thread is covered by the plastic coating. The plastic coating can therefore extend in particular over the root of the thread, the flanks and the crest of the thread.

In one configuration, the at least one thread has a first section covered by the plastic coating and a second section that is not covered by the plastic coating. In particular, the first and the second section can each be contiguous. The at least one thread can have a length of N turns, for example. The first section can then have a length of N-x turns and the second section can have a length of x turns.

The number N can assume values greater than two, for example 2.50 or 6.75 or 100.00. Thus, N can be greater than 2.00 and up to and including 100.00. Higher values of N are of course also conceivable and possible. The at least one thread can have a number of complete 360° revolutions and a number of fractions of revolutions less than 360°, which can be provided in the case of the at least one thread, in particular on at least one of the ends, and in which the thread turn can optionally be chamfered , to make it easier to engage another thread, for example when screwing in or unscrewing.

The number x can assume values of one or more, for example 1.00 or 1.25 or 1.50 or 1.75 or 2.00. For example, x can be between 1.00 and 4.00 under the condition x/N<0.5. Of course, higher values of x are also conceivable and possible if x/N<0.5 is fulfilled. If necessary, the condition can also be formulated more strictly in order to make the production simple and inexpensive To allow adjustment assembly with dimensions in the desired tolerances. In particular, the condition can be x/N < 0.2 or x/N < 0.15 or x/N < 0.1.

In one embodiment, the second section has an axial length that corresponds to at least one turn of the thread, in particular a maximum of four turns of the thread, of the at least one thread. Equivalently or alternatively to this, the second section has an axial length which is at most 20%, in particular at most 15%, in particular at most 10%, of a total length of the at least one thread. The second section can have an axial length which corresponds at most to twice or more than twice, for example three times or at most four times the distance between two thread crests (adjacent in section) of the at least one thread. The fact that the second section makes up more than one turn of the thread can have the advantage that the adjustment assembly can also be produced simply and precisely when a pitch of the at least one thread is very steep. If the pitch of the at least one thread is shallower, the second portion may be less than two turns of the thread.

The second section can therefore be shorter than two turns. In particular, the second section can have an axial length that corresponds to less than twice the distance between two thread crests of the at least one thread. In one embodiment, the second section has an axial length that corresponds to 1.50 times or 1.75 times or 3.75 times the distance between two thread crests of the at least one thread. With an axial length that corresponds to 1.00 times the distance between two thread crests of the at least one thread, the tribological properties of the at least one thread can be maximized under the condition of simpler, cost-effective production with dimensions in the desired tolerances. With an axial length that corresponds to 1.50 times or 1.75 times or 3.75 times the distance between two thread crests of the at least one thread, a chamfered section can also be included in the second section, so that the at least one thread can be arranged more easily on a mating thread of a receiving body during manufacture. A chamfered portion may mean a portion where adjacent thread crests have different heights. Such a section can be produced by chamfering the at least one thread. When using a chamfered section, manufacture with a negligible limitation of the optimization of the tribological properties.

The second section can be arranged at one of the ends of the at least one thread. In one configuration, the first section is arranged at a first end of the at least one thread. The second portion may be located at a second end of the at least one thread opposite the first end. As a result, an outer element can be molded onto the plastic coating on the first section at the first end, which can be formed in one piece with the plastic coating. In one embodiment, the plastic coating at the second end does not extend to a front side of the at least one thread, so that a gap forms there between a further thread that engages with the at least one thread, the profile of which corresponds to a profile of the plastic coating. In particular, the gap can be just as large as a thickness of the plastic coating. The thickness can be, for example, in a range from 0.1 mm to 0.5 mm, in particular 0.3 mm, and/or 1% to 10%, in particular 5%, of the diameter of the at least one thread.

In one configuration, the plastic coating has a constant thickness. The plastic coating can thus lay skin-like against a profile of the at least one thread. In particular, the plastic coating can follow a contour of the at least one thread. This can mean that the plastic coating covers the circumferential thread turn and in particular also the circumferential thread crest of the at least one thread. The at least one thread can therefore be more than 50% covered by the plastic coating in a continuous section.

In one embodiment, the plastic coating forms the profile of the at least one thread. This can mean that the at least one thread has a profile, for example a trapezoidal profile, which is covered by the plastic coating, with the plastic coating forming a profile that differs from the profile of the at least one thread. The profile that forms the plastic coating can, for example, have wider and/or higher teeth than the profile of the at least one thread. In one embodiment, the profile of the at least one thread forms a thread tooth base for each thread tooth formed by the plastic coating, the plastic coating forming a thread tooth body molded onto the thread tooth base. One Geometric shape of the thread tooth body can differ from that of the tooth root. For example, the root of the thread tooth can be trapezoidal and the body of the thread tooth can be triangular. Thus, the profile of the at least one thread can differ from the profile that forms the plastic device, so that the profile of the at least one thread is shaped or determined by the plastic coating.

In one embodiment, the at least one thread and the plastic coating on the at least one thread have identical and/or different flank angles. The flank angle can be dimensioned to the thread axis. Different flank angles can, for example, achieve better support of a profile formed by the plastic coating on the at least one thread. Likewise, the wear of the at least one thread can be reduced in a more targeted manner through different flank angles. If the at least one thread and the plastic coating on the at least one thread have identical and different flank angles, the flank angles can be identical in at least one section of the at least one thread and different in at least one other section of the at least one thread.

In one configuration, a thickness of the plastic coating varies along the at least one thread. In particular, the thickness of the plastic coating can vary periodically. Such a configuration can differ from a configuration in which the plastic coating has a constant thickness in that the thickness assumes specific values at specific, recurring points of the at least one thread. For example, a thickness of the plastic coating can vary periodically in that it is thicker at the crests and/or roots of the thread than at a flank of the at least one thread. It is also conceivable and possible that the thickness of the plastic coating increases constantly towards one end.

In one embodiment, the plastic coating is thicker on a thread flank of the at least one thread facing a load end of the at least one thread than on a thread flank of the at least one thread facing away from the load end of the at least one thread. This can mean that the plastic layer on one flank of a thread tooth is thicker than on the other flank of the thread tooth. The load end can be one of the ends of the at least one thread. Specifically, the load end is on End of the at least one thread from which a load acts on the at least one thread. For example, this can be a force that causes a vehicle seat to be lifted via the at least one thread in an adjustment assembly. Such an asymmetrical thickness along the thread can make it possible to specifically protect the at least one thread from wear.

Additionally or alternatively, a thickness of the plastic coating can vary periodically in that the plastic coating forms a profile whose flanks have a pitch angle that is flatter than a pitch angle of the flanks of the at least one thread. As a result, the tribological properties of the at least one thread can be improved by the plastic coating, while at the same time a planar support of the plastic profile can be realized via the flanks of the at least one thread in the event of a crash or under another high load. A surface pressure on the plastic coating can be minimized in this way, so that the plastic profile is not subjected to bending stress under load.

One configuration of the at least one thread and the plastic coating that realizes these advantages consists in providing, as described above, that the at least one thread is a trapezoidal thread and the plastic coating on the at least one thread forms a plastic thread with a triangular profile.

In one embodiment, the at least one thread has a first profile shape on a first profile section and a second profile shape on a second profile section, which differs from the first profile shape. The different profile shapes can be optimized for different functions. For example, it is conceivable and possible to provide different profile shapes on the first section. Likewise, the profile shapes of the first and the second section of the at least one thread can differ.

In one embodiment, the at least one thread is single-start. In particular, the first or the second thread can be single-start. It is preferred that the first and second threads are single-start, because installation space can be saved by providing as few thread turns as possible. In principle, however, several thread turns of a multiple thread can also be covered by the plastic coating to more than 50% and possibly less than 100% if such an adjustment assembly is desired. In one embodiment, the first adjustment part is a spindle nut and the second adjustment part is a spindle. The spindle nut can engage the second thread of the spindle via the first thread in order to adjust the spindle. A rotation of the spindle nut can cause a translatory adjustment of the spindle. During normal operation, rotational forces can act between the first and the second adjustment part along the direction of rotation of the first adjustment part, which forces are caused by friction between the threads. In the case of adjustment parts known from the prior art, the rotational forces can be increased by tilting relative to one another. In addition, an axial force can act on the second adjustment part along the thread axis, causing the translational adjustment of the second adjustment part. In particular, the rotational forces can cause unwanted noise, which can be suppressed by the plastic coating arranged between the threads. In a section of the at least one thread in which there is no plastic coating, accidental tilting of the adjustment parts relative to one another can result in rotational forces, whereby the probability of occurrence can be minimized by covering a section of the at least one thread with the plastic coating is as large as possible. Since the coating of the at least one thread with plastic enables a shortened design of the adjustment part, rotational forces are optionally additionally minimized because the probability of accidental tilting decreases as the length of the adjustment part decreases. The deflection forces would then have to be very large because the adjustment part is shortened as a lever arm. In addition, the shorter design also reduces the likelihood of the first and second adjustment parts becoming jammed.

In one embodiment, the first and/or the second adjustment part consists of metal, in particular steel or brass. The first and the second adjusting part can be a steel nut and a steel spindle. In principle, it is desirable to provide a material for the first and the second adjustment part that is suitable for absorbing high loads, such as crash forces. Of course, a material made of particularly hard plastic can also be provided for this.

In one configuration, the at least one thread has at least one recess. The at least one recess can be elongate along a thread axis of the at least one thread. The at least one recess can be a slit extending along a thread axis through the circumferential thread of the form at least one thread. The thread turn of the at least one thread can be interrupted at the at least one recess. This means that the at least one thread can be incomplete in order to realize the at least one recess. The at least one recess can also be formed by defects of any shape in the at least one thread, which are designed so that plastic melt can penetrate into them. Additionally or alternatively, at least one recess can be provided, which extends radially to the thread axis in the at least one thread. It is conceivable and possible, for example, for the at least one recess to be formed by a depression formed radially to the thread axis in the at least one thread.

The at least one recess can be filled with plastic. The same plastic that was used to produce the plastic coating can be used to fill the at least one recess. In other words, the plastic coating and the filling of the at least one recess can be formed in one piece. The section of the plastic coating that fills the at least one recess can form a holding element that is molded onto the plastic coating and via which the plastic coating is held in a form-fitting manner on the at least one thread. This can enable the plastic coating to better withstand torsional forces that could cause twisting relative to the at least one thread during operation of the adjustment assembly, so that the plastic coating is held on the at least one thread in a twist-proof manner. It can be advantageous to provide a plurality of recesses, optionally of different shapes, which are optionally arranged at a regular spacing around the circumference of the at least one thread, so that the forces acting on the plastic coating can be optimally dissipated.

Additionally or alternatively, the at least one thread can have an uneven surface topography, in particular flaws and/or roughness, so that there is at least a partial form fit between the at least one thread and the plastic coating. Due to the uneven surface topography, the plastic coating can more easily enter into an at least partial form fit with the at least one thread, because the plastic melt used to produce the plastic coating can penetrate into micro-depressions or flaws in the surface. To achieve an uneven surface topography, the surface of the at least one thread can be roughened. To roughen the surface, it can be treated with laser structuring, for example. It is also conceivable and possible that the surface is additionally or alternatively activated with a plasma or with a primer in order to enable a material bond with the plastic coating. To improve the connection between the at least one thread and the plastic coating, both at least one recess and a roughened surface can be provided.

In one embodiment, at least one of the adjustment parts has an outer element that is formed in one piece with the plastic coating of the at least one thread. In particular, the first adjustment part can have such an outer element. If the first adjustment part is a spindle nut, for example, an adjustment part body of the first adjustment part can be a steel insert and the outer element can be a plastic encapsulation of the steel insert.

The outer element can be molded onto the plastic coating. For this purpose, the outer element can be arranged on an end face of the at least one thread. There may be a seamless transition between the plastic coating and the outer element.

In one embodiment, the outer element is formed from a different material than the plastic coating. The plastic coating can then be bonded to the outer element. For example, the plastic of the plastic coating can flow into a plastic of the outer element. A mixing section is also conceivable and possible between the plastic coating and the outer element, in which the plastic of the plastic coating and the plastic of the outer element are mixed with one another in sections.

In one embodiment, the plastic coating and the outer element are formed from the same material. Polyoxymethylene (POM), for example, can be provided for the plastic coating, so that it can be advantageous to also form the outer element from POM. Alternatively, polyamide (PA) can also be provided for the plastic coating.

Regardless of whether the same or different plastic materials are used for the outer element and the plastic coating, the outer Element and the plastic coating are injected together in one step using an injection molding process. This can make the production of the at least one adjustment part simpler and more cost-effective and at the same time ensure a seamless transition from the outer element to the plastic coating.

A mechanical interface can be formed on the outer element, which can be used, for example, to introduce an adjustment force into the at least one adjustment part. In the case of the first adjustment part, external teeth can be formed on the outer element, for example. In addition, the outer element can also be used to create a form fit between the adjustment part body and a plastic body that is formed by the outer element and the plastic coating together. For this purpose, the outer element can be positively connected, for example, to a projection of the adjustment part body. This can be brought about, for example, by reaching behind the projection and/or by means of circumferential teeth which are arranged on the projection and with which the outer element is in engagement.

According to a second aspect of the invention, the object is also achieved by a method for producing an adjustment part for an adjustment assembly. The adjustment assembly can in particular be an adjustment assembly according to the first aspect of the invention. The implementation of the procedure includes the following steps.

In a first step, the adjustment part is provided with a thread. This can be, for example, a spindle nut with an internal thread or a spindle with an external thread.

In a second step, a receiving body is provided. The receiving body has a counter-thread. The mating thread has a holding section which is designed so that the thread on it can engage in the mating thread. The counter-thread and in particular its holding section can therefore be suitable for holding the adjustment part on the receiving body via the thread. To hold the adjustment part on the receiving body, the holding section can be designed in such a way that there is no play between the mating thread and the thread. The thread can therefore preferably be held firmly in a defined position on the holding section. The statements made above in connection with a length of the second section of the at least one thread apply to the length of the holding section. Especially the holding section can have an axial length which corresponds to at least one revolution of the thread, in particular a maximum of four revolutions of the thread, of the at least one thread. Equivalently or alternatively, the holding section can have an axial length which is at most 20%, in particular at most 15%, in particular at most 10%, of a total length of the mating thread. The holding section can also be shorter than two revolutions and in particular have a length that corresponds to the distance between two thread crests of the mating thread. For holding in a defined position, it can be of particular importance that the holding section is designed in such a way that it is ensured that the adjustment part is held firmly on the receiving body. For example, in the case of a steep thread pitch of the mating thread, the holding section can be several revolutions long.

The mating thread also has a gap section whose radius differs from the radius of the holding section. In particular, the radius of the gap section can be smaller in the case of an external thread as the mating thread and larger in the case of an internal thread as the mating thread than the radius of the holding section. Additionally or alternatively, its flank width can be different from a flank width of the holding section. In particular, the flank width of the gap section can be narrower than the flank width of the holding section. In other words, the gap section can differ from the holding section in that it is pulled back into the mating thread relative to the holding section, so that the adjustment part can only be held via the thread on the gap section of the receiving body with a certain amount of play. The mating thread can therefore be designed on the gap section to hold the adjustment part loosely, or be designed to allow the adjustment part to be arranged loosely thereon.

In a third step, the adjustment part is arranged on the receiving body, so that the adjustment part is held on the holding section and a gap is formed in the gap section. The gap can be formed in that the radius of the gap section is different from the radius of the holding section. To arrange it on the receiving body, the adjustment part can be screwed onto or into the receiving body until the adjustment part reaches an end position, for example on a stop or a contact surface of the receiving body. As a result, it can be turned on or off tightly. The holding section can be arranged downstream of the gap section along an arrangement direction of the adjustment part on the receiving body. The receiving body can be arranged in a rotationally fixed manner. The receiving body is preferably a part of a tool for producing an adjustment part, in particular a detachable part. It can be permanently mounted. The adjustment part can be arranged, for example, by turning the adjustment part into the receiving body. Arranging by screwing in can be suitable for a receiving body with an internal thread and an adjustment part with an external thread, such as a spindle. Alternatively, the adjustment part can be arranged by screwing the adjustment part onto the receiving body. A twist-on arrangement may be suitable for a female body with an external thread. For example, such a receiving body can have a free-standing thread core onto which the adjustment part, in particular a spindle nut, is screwed.

By holding the adjustment part on the holding section in a defined position, the gap that can result from the play between the adjustment part and the counter-thread on the gap section can be well defined. In particular, the gap can be rotationally symmetrical to a thread axis of the adjustment part.

In a fourth step, plastic is introduced into the gap. The plastic can be introduced in such a way that the gap is completely filled with plastic. At least one recess that may be present on the thread of the adjustment part can also be filled in this way. Likewise, all thread turns of the thread, which are arranged on the gap section of the mating thread, are covered with plastic. A section of the thread of the adjusting part arranged on the gap section can form a first section as described above. Since the adjusting part is held without play on the holding section of the mating thread via another second section of the thread, as described above, the second section cannot be covered with plastic, so that the plastic coating covers the thread by more than 50% but less than 100%. covered. After the adjustment part has been removed from the receiving body, the second section can be removed from the adjustment part, for example by grinding.

Holding the adjustment part on the holding section of the mating thread enables the adjustment part for the adjustment assembly to be produced easily and inexpensively, with the desired dimensions of the plastic coating being able to be achieved within the required tolerances in particular through the well-defined gap. The production of the adjustment part with the aid of the receiving body also makes it possible, in particular, to achieve a desired shape of the plastic coating in a simple manner by forming the profile of the mating thread. Because of the profile of the mating thread, it can be possible to configure the shape of the gap and thus the plastic coating as desired.

In addition, at the same time as the plastic is introduced into the gap, an outer element of the adjustment part can optionally be formed with external teeth. A plastic melt can be particularly suitable for introducing plastic into the gap. The plastic melt can be used to fill the gap. The liquid plastic can flow around the thread and also flow into at least one recess that may be present.

The plastic can be introduced into the gap along a direction parallel to a thread axis of the thread. This can mean that the plastic is introduced into the gap, for example, along the pitch of the thread, but also over the tips of the thread. The plastic, in particular the plastic melt, can be free to spread out in the gap along a lateral surface of the thread.

In one embodiment, the plastic is introduced into the gap over the entire circumference of the thread. In other words, the plastic can be introduced into the gap from any direction. The plastic is preferably introduced into the gap from all directions, over the entire circumference of the thread, because production can take place particularly quickly in this way.

An injection molding process can be particularly suitable for such a process.

In one embodiment, the adjustment part is aligned axially and/or rotationally via the flank width when it is arranged on the receiving body via a contact surface of the receiving body. The axial orientation of the adjustment part can include an axial screwing-in or screwing-in depth of the adjustment part. In principle, the axial alignment can be ensured via an (internal) stop by the thread itself, in that the adjustment part is screwed onto the receiving body up to one end of the thread or screwed into the receiving body. However, the axial alignment of the adjustment part can also be defined via the contact surface of the receiving body. For this purpose, the adjustment part can have a projection projecting in a plane perpendicular to the thread axis. The contact surface can be designed in such a way that the projection hits it when the adjustment part is arranged on the receiving body. In addition to the consequent forced axial alignment of the adjustment part, a radial alignment of the adjustment part can also be made possible via the contact surface. It is therefore also conceivable and possible for the adjustment part to be held on the receiving body with play on the holding section, because the radial alignment is already produced simply by the interaction of the projection with the contact surface. Of course, the adjustment part can also be held on the holding section without play in order to improve the radial alignment.

The rotational alignment of the adjustment part can be made possible by a predetermined number of rotations that are required to arrange the adjustment part on the receiving body in the desired position. This can be realized in that the flank width is designed to narrow the thread in such a way that the adjustment part can be screwed to the receiving body in a block.

The method can be used to produce an adjustment part for an adjustment assembly according to the first aspect of the invention.

The idea on which the invention is based is to be explained in more detail below with reference to the exemplary embodiments illustrated in the figures. Show it:

Fig. 1 is a sectional view of a conventional adjustment part with a

adjustment part body made of steel;

2 shows a sectional view of a conventional adjustment part with an adjustment part body made of steel and an external thread made of plastic;

3 shows a sectional view of an adjustment assembly with a plastic coating; 4 shows a sectional view of an adjustment assembly with a first adjustment part with a first thread, which has a first and a second section;

Fig. 5 is a detailed view of an adjustment assembly with a

plastic coating and an outer element;

6 shows a sectional view of a thread with a plastic coating;

7 shows a first adjustment part with a first thread with three recesses;

8A shows a side view of a first adjusting part with external teeth;

FIG. 8B shows a sectional view of the first adjusting part along the sectional plane in FIG. 8A;

9 shows a section of a method for producing an adjustment part with an external thread; and

10 shows a section of a method for producing an adjustment part with an internal thread.

Fig. 1 shows a conventional first adjustment part 2, which is designed as a spindle nut. The first adjustment part 2 comprises a first adjustment part body 20 which is designed as a strength part. In the present case, the strength part is a metal nut with a metal thread as the first thread 202. The first thread 202 is an internal thread which is designed to engage with the external thread of a second adjusting part 3, for example a spindle. An outer element 21 made of plastic is molded onto the first adjustment part body 20 . The outer element 21 has external teeth 211 . The external toothing 211 is designed to be in engagement with a drive worm. Although the metal thread of such a first adjustment part 2 can absorb high axial forces, such as can occur in the event of a crash, for example, because the metal thread provides sufficient strength, undesirable noises, such as squeaking, can occur during normal operation if the metal thread is insufficiently lubricated, for example is. Fig. 2 shows another embodiment of a conventional first adjustment part 2. The first adjustment part 2 comprises a first adjustment part body 20, a first thread 202, which consists of metal and is designed to engage with a second thread of a second adjustment part 3, and an outer member 21 molded onto the first adjuster body 20 . In addition to the exemplary embodiment illustrated in FIG. 1 , the outer element 21 includes an external thread 212 which is designed as an internal thread and is also designed to engage with a second adjustment part 3 . The first and external threads 202, 212 are juxtaposed along a common thread axis G . A radius of the first thread 202 is larger than a radius of the outer thread 212, so that the second adjustment part 3 has play relative to the first thread 202 during normal operation. Under certain circumstances, unwanted noises can thereby be avoided during normal operation if the first adjustment part 2 does not tilt too much relative to the second adjustment part 3 . The second adjusting part 3 engages with the external thread 212 during normal operation. So it has no play to the outer thread 212 . The outer thread 212 is made of plastic. Therefore, the second adjustment part 3 can be adjusted with less friction and thus less wear, higher efficiency and smoother running. Under load and in particular in the event of a crash, an axial force acts on the second adjustment part 3 along the thread axis G, which causes the outer thread 212 to be deformed and the second adjustment part 3 to engage with the first thread 202 . The first thread 202 thus supports the second adjustment part 3 .

Such a first adjustment part 2 can improve the tribological properties, but under certain circumstances has the disadvantage that along the thread axis G a relatively large installation space is required by the threads 202, 212 arranged next to one another. There is also the possibility of accidental contact between the second adjustment part 2 and the first thread 202 during normal operation, so that undesired noises cannot be ruled out with absolute certainty.

3 shows an exemplary embodiment of an adjustment assembly 1 according to the present invention. The adjustment assembly 1 comprises a first adjustment part 2 with a first thread 202 and a second adjustment part 3 with a second thread 32. The second thread 32 is in engagement with the first thread 202. In the present case, the first adjustment part 2 is a single-threaded spindle nut which has a first adjustment part body 20 made of metal, in particular steel. In principle, the first adjustment part 2 can, of course, also have multiple threads and/or consist of a different material that provides sufficient strength. The first thread 202 is designed trapezoidal, which has the advantage of high strength against forces occurring in the event of a crash, although other shapes are of course also conceivable and possible. In this exemplary embodiment, the first thread 202 is an internal thread of the spindle nut.

The second adjusting part 3 is a spindle. The second adjustment part includes a second thread 32 in the form of a trapezoidal external thread shown as an example. The second adjustment part 3 is arranged coaxially to the first adjustment part 2 and can be longitudinally adjusted, for example, by rotating the (for example stationary) first adjustment part 2 along the common thread axis G.

In addition, the first thread 202 has a plastic coating 210 . The plastic coating 210 completely covers the section of the first thread 202 shown. It forms a skin-like layer of constant thickness D covering the first thread 202 . In principle, of course, the second thread 32 can also be additionally or alternatively coated with plastic. The arrangement of a plastic coating 210, 30 between the first and the second thread 202, 32 improves the tribological properties during normal operation. The plastic coating 210 is supported by the underlying first thread 202 . As a result, at high loads, when the second adjustment part 3 is loaded against the first adjustment part 2 along the common thread axis G, there is no bending stress on the plastic. The plastic layer only has to transmit compressive forces, whereby the surface pressure is influenced by the thread geometry, the thread tooth height, the diameter and the thread length.

The first adjusting part 2 also has an outer element 21 which is formed in one piece with the plastic coating 210 of the first thread 202 . The outer element 21 and the plastic coating 210 form a coherent plastic body that almost completely covers the first thread 202 and also extends over an outer area of the first adjustment part 2 . External teeth 211 are also formed on the outer element 21 . The external toothing 211 is designed so that a drive worm of an adjusting gear can engage in the external toothing 211 via the first adjusting part 2 for adjusting the second adjusting part 3 . The outer element 21 engages behind an annular projection 206 of the first adjustment part 2. As a result, the plastic coating 210 is held on the first adjustment part 2 via the outer element 21 in a form-fitting manner. Such a form fit can be provided in addition to or as an alternative to the at least one recess 205 described below or a roughened surface of the at least one thread 202, 32.

4 shows a further exemplary embodiment of an adjustment assembly 1 with a first adjustment part 2 with a first thread 202 and a second adjustment part 3 with a second thread 32 which engages with the first thread 202 . The first thread 202 has a plastic coating 210 that almost completely covers the first thread 202 . That is, the first thread 202 is more than 50% and less than 100% covered. Specifically, the first thread 202 is between 80% and 85% covered with plastic. The thread has six turns, five of which are covered with plastic, so that the coverage corresponds to approx. 83.3%. The first thread 202 has a first section covered by the plastic coating 210 and a second section that is not covered by the plastic coating 210 . The plastic coating 210 is arranged on the first section between the first and the second adjustment part 2, 3, so that the first and the second thread 202, 32 on the first section engage with one another without play. A gap S' is formed at the second portion. The first thread 202 is spaced apart from the second thread 32 by the gap S'. Therefore, the first and second threads 202, 32 on the second section have play with each other. The occurrence of undesired noises can nevertheless be ruled out with a high degree of certainty because the second adjustment part 3 is held on the first section so that it cannot tilt and because the second section is very short relative to the first section. Specifically, the length ratio between the first and second sections is 5 to 1.

The second section has a length along the thread axis G which corresponds to the distance A between two adjacent thread crests 203, 203'. This corresponds to a section of a thread turn 204 of the first thread 202 which covers at least 360°, ie a full circumference of the first thread 202 once. This is one revolution of the first thread 202. In principle, the second section can be longer than the distance A between two adjacent thread crests 203, 203'. The first section, on the other hand, has a length that corresponds to more than four times the distance A between two adjacent thread crests 203, 203'. Specifically, the length of the first Section five times A. In principle, the first section can be shorter or longer than four times the distance A between two thread crests 203, 203'. In particular, the length of the first section is independent of a length of the second section as long as the second section has a length of x turns for a number of N revolutions of the first thread 202 and the condition x/N<0.5 is met. The first section forms a continuous section of the first thread 202 over which the plastic coating 210 extends.

The first section is located at one end of the first thread 202 and the second section is located at the other end of the first thread 202 . An outer element 21 is molded onto the first section. The outer element 21 forms a continuous plastic body with the plastic coating 210, as has already been described in connection with FIG.

5 shows a detailed view of an adjustment assembly 1. It can be seen from this that the plastic coating 210 has a constant thickness D. In particular, the thickness D of the plastic coating 210 at a thread crest of the first thread 202 is the same as at a thread root of the first thread 202. The plastic coating 210 thus reproduces the profile of the first thread 202. The first thread 202 is trapezoidal, so that the plastic coating 210 also has a trapezoidal profile. However, the profile that forms the plastic coating 210 is wider and higher than the profile of the first thread 202. Thus, in effect, the profile of the first thread 202 is formed by the plastic coating 210 of the first thread 202, even though the plastic coating 210 is the profile of the first thread 202 simulates.

The plastic coating 210 can be used to cover the profile of the first (or also the second) thread 202, 32 with any desired profile and to shape it in this way. As a result, the plastic coating 210 can shape the profile of the thread 202, 32. An exemplary embodiment variant for the thread 202 is shown in FIG. It also applies to the thread 32 by way of example. FIG. 6 shows a thread 202 with a plastic coating 210 whose thickness D varies periodically along an axial direction of the thread 202 . The thread 202 has a trapezoidal profile, the flanks of which enclose angles b1 and b2 to the axis G of the thread. The profile of the thread 202 is covered by the plastic coating 210, which is triangular in shape and whose threads include flank angles a1 and a2 to the thread axis G. The first flank angle a1 of the plastic coating 210 is identical to the second flank angle a2 of plastic coating 210. The first flank angle b1 of thread 202 is identical to the second flank angle b2 of thread 202. The identical flank angles a1 and a2 of plastic coating 210 are different from the identical flank angles b1 and b2 of thread 202 , namely larger (a1, a2 > b1, b2). In principle, the flank angles a1, a2, b1, b2 can also be identical (a1, a2=b1, b2). The function of the trapezoidal profile of the thread 202 can be seen here in that its flanks support the plastic coating 210 in the event of a crash. This can prevent the plastic thread from yielding to the crash forces and/or being plastically deformed and no longer able to run after the crash. With such a thread 202, the advantages of a metal thread that imparts strength can be combined with a plastic thread that has good tribological properties.

The trapezoidal profile is only shown as an example. In principle, the first and second flank angles a1, a2 of the plastic coating 210 can be different (a1<>a2). For example, the first flank angle a1 can be steeper than the second flank angle a2 in order, for example, to enable better protection against wear on one side. Likewise, the first and the second flank angle b1, b2 of the first (or of the second) thread 202, 32 can be different (b1<>b2) in order to enable better support of the plastic coating 210. It is therefore possible to realize asymmetrical thread tooth forms both for the plastic coating 210 and for the first and/or the second thread 202, 32 by selecting the flank angle.

In principle, a plastic coating 210 of any shape can be arranged on any profile shape of the thread 202 . In particular, it is also conceivable and possible for the thread 202 to have a first profile shape on a first profile section and a second profile shape on a second profile section, which differs from the first profile shape. This can be realized, for example, by different flank shapes, with a first flank shape being optimized for normal operation and a second flank shape for supporting the plastic thread in the event of a crash. The plastic coating 210 can form a profile which is symmetrical or asymmetrical on the thread teeth of the underlying threads 202,32. An asymmetric profile can be used to provide better wear protection for directional loads. 7 shows a first adjustment part 2 with a first adjustment part body 20. The first adjustment part body 20 has a first thread 202, which is designed as an internal thread. The thread 202 has three recesses 205 which are intended to be filled with plastic. In principle, any number of recesses 205 can be provided. The recesses 205 extend like a corridor along a thread axis G of the first thread 202 from one end of the thread 202 to the other end of the thread 202 . The recesses 205 form interruptions in the threads. This is realized in that the thread crests 203, 203' are removed down to the root of the thread. A width of the recesses 205 corresponds in each case to 10° of the thread circumference. The recesses 205 are evenly distributed along the circumference of the first thread 202 . In principle, a large number of recesses 205 are conceivable and possible, which can each have widths that correspond to angular segments of the thread circumference between 1° and 30°. Likewise, other arrangements and shapes of recesses 205 are conceivable and possible, such as a recess 205 that extends radially to the thread axis G into the first thread 202 .

The first adjusting part body 20 has an annular projection 206 formed thereon. The annular projection 206 has a peripheral surface forming a jacket, on which a toothing 207 is arranged. The teeth 207 have elongate teeth, which extend parallel to a thread axis G of the first thread 202 of the first adjustment part 2 .

8A shows the first adjustment part 2 with an outer element molded onto the first adjustment part body 20 . The outer element 21 is preferably injection molded together with the plastic coating 210 . The outer element 21 has an external toothing 211 which is designed as a helical toothing. In principle, the external toothing 211 can be of any desired design, in particular a straight toothing is also conceivable and possible.

8B shows a section through the first adjusting part 2 shown in FIG. 8A along the sectional plane E drawn therein. The first thread 202 has a plastic coating 210 that fills two recesses 205 on the first thread 202 . At the location of the recesses 205, the plastic coating 210 supplements the interrupted threads. This is realized in that the plastic coating 210 at the Recesses 205 forms a profile that corresponds to the profile of the first thread 202 with plastic coating 210 away from the recesses 205. The first thread 202 thus has a plastic coating 210 which forms a continuous thread profile, the thread profile being supported by the first thread 202 in sections.

The outer element 21 is arranged circumferentially on the projection 206 of the first adjustment part body 20 . A toothing 207 of the projection 206 of the first adjustment part body 20 engages in the outer element 21 along a circumferential direction. The teeth 207 of the projection 206 and the recesses 205 can be provided together on the first adjustment part 2 . However, each of the features may be provided independently of the other.

When using the first adjustment part 2 in an adjustment assembly 1 for adjusting, for example, an adjustment drive in a motor vehicle, it may be necessary to create a flow of force between the external teeth 211 and the plastic coating 210 . For this purpose, the outer element 21 must be arranged on the adjustment part body 20 in a rotationally fixed manner. This means that the outer element 21 must take the first adjustment part body 20 with it when it is driven, for example by a drive worm. For this purpose, inter alia, the toothing 207 can be provided on the projection 206 , which establishes a form fit between the outer element 21 and the first adjustment part body 20 . In addition, the outer element 21 can be formed in one piece with the plastic coating 210, so that a direct flow of forces between the plastic coating 210 and the external toothing 211 is produced. Furthermore, the recesses 205 ensure that a flow of force between the adjusting part body 20, which is driven via the external toothing 211, and the plastic coating 210 is ensured. Due to the recesses 205, the plastic coating 210 is arranged on the first adjustment part body 20 in a rotationally fixed manner.

In order to ensure a form fit between the first thread 202 and the plastic coating 210, a surface of the first thread 202 can have an uneven surface topography in addition or as an alternative to the provision of recesses 205. Likewise, combinations of recesses 205 with different shapes are conceivable and possible.

Fig. 9 shows a section of a method for producing an adjustment part 3 for an adjustment assembly 1. The method can in particular be a Act injection molding process with which the plastic coating 30 and optionally an outer element can be produced. The adjustment part 3 has a thread 32 which is designed as an external thread. The method is carried out with the receiving body 4 shown, which has a mating thread 40 for the thread 32 of the adjustment part 3 . The mating thread 40 has a holding section 401 which is designed so that the thread 32 of the adjustment part 3 can engage in the mating thread 40 thereon. The thread 32 and the mating thread 40 on the holding section 401 are designed to match one another. The adjustment part 3 can therefore be held on the receiving body 4 without play via the counter-thread 40 by being screwed into the holding section in a block.

In addition, the mating thread 40 has a gap section 402 . In the present case, the radius R' of the gap section 402 is greater than the radius R of the holding section 401 and a flank width B' of the thread on the gap section 402 is narrower than a flank width B of the thread on the holding section 401. Thread 32 and mating thread 40 therefore also fit on the gap section 402 in each other, but play with each other. The holding section 401 is arranged behind the gap section 402 along a direction of screwing into the mating thread 40 . It closes the mating thread 40 in this direction to such an extent that a stop for the adjustment part 3 is formed, onto which the adjustment part 3 can be screwed as a block.

The receiving body 4 can be arranged in a fixed manner. For example, the receiving body 4 can be arranged on a tool for plastic injection molding. The adjustment part 3 is arranged on the receiving body 4 by being screwed into the receiving body 4 . For this purpose, it is screwed onto a block until it is fixed axially on the holding section 401 . By being fixed to the holding section 401 , the adjustment part 3 is positioned radially symmetrically to the thread axis G of the receiving body 4 . In order to enable the axial fixation, the holding section 401 must have a length that corresponds at least to the distance between two crests of the thread 32 of the adjustment part 3 . In other words, the holding section 401 should be designed in such a way that the adjustment part 3 has to complete at least one rotation in order to be screwed into the holding section 401 . The threads of conventional threads are chamfered to allow better initial engagement with a mating thread 40 during threading. Such a chamfer can account for up to three quarters of a revolution of a thread. If the holding section 401 is chamfered, it may be advantageous to provide a holding section 401 with a length that is at least 1.5 times the distance between two crests of the thread Thread 32 of the adjustment part 3 corresponds. The fixation on the holding section 401 makes it possible to ensure that the gap S at the gap section 402 is formed radially symmetrically within the required tolerance.

Then in the gap S plastic 30 is introduced. The plastic 30 can be introduced, for example, by filling the gap S with plastic melt. The plastic is introduced into the gap S along the circumference of the thread 32 . This is represented by the plastic mass 30 penetrating parallel to the thread axis G in the direction of the holding section 401 . In this case, the plastic is introduced over the entire circumference of the thread 32 . Due to the defined formation of the gap S by fixing it to the holding section 401, it is in particular not necessary to introduce the plastic along a thread or from a narrowly defined, predetermined direction, so that a quick, simple and cost-effective production is possible.

The shape of the gap S can be adjusted via the design of the gap section 402, so that a plastic coating with a desired profile can be produced using the method described.

The method described in connection with FIG. 9 is particularly suitable for producing a plastic coating 30 on the thread 32 of a spindle.

10 shows a step in a method for producing an adjustment part 2 for an adjustment assembly 1, the adjustment part 2 having a thread 202 which is designed as an internal thread. The method is carried out with the receiving body 4 shown, which has a mating thread 40 for the thread 202 of the adjustment part 2, which is designed as an external thread. In particular, the receiving body 4 comprises a thread core on which the external thread is arranged. The mating thread 40 has a retaining portion 401 and a splitting portion 402 as defined above. The radius R' of the gap section 402 is presently smaller than the radius R of the holding section 401 and a flank width B' of the thread on the gap section 402 is narrower than a flank width B of the thread on the holding section 401. Therefore, thread 202 and mating thread 40 fit as in connection with 9 described at the gap section 402 into one another, but have play with one another. The adjusting part body 20 is arranged on the receiving body 4 by being screwed onto the receiving body 4 . For this purpose, it is screwed onto a block until it is fixed axially on the holding section 401 . Here, too, the adjustment part 2 is positioned radially symmetrically to the thread axis G of the receiving body 4 as described in connection with FIG. 9 by being fixed to the holding section 401 . The holding section 401 must meet the same requirements as described in connection with FIG. 9 . In addition, a contact surface C is provided on the receiving body 4, which interacts with a projection 206 of the adjustment part body 20 that projects in a plane perpendicular to the thread axis G in such a way that it provides a stop against which the adjustment part body 20 strikes when it is screwed onto the receiving body 4 . The adjustment part 20 is fixed axially and radially on the receiving body 4 through the interaction of the contact surface C and the projection 206 .

The plastic is introduced into the gap S in the same way as described in connection with FIG.

Simultaneously with the introduction of the plastic into the gap S, the outer element 21 of the adjustment part 2 shown in FIG. 10 can be formed. It engages behind the projection 206, as described in connection with FIG. 3, up to the contact surface C on which the projection 206 bears. In principle, different projections can be provided on the adjustment part 2 for the interaction with the contact surface C and for the shapes of the outer element 21 . The simultaneous molding of the outer element 21 makes it possible to produce the plastic coating 210 on the adjustment part 2 and the outer element 21 in one process step, whereby costs can be saved and the production efficiency can be increased. If it should be necessary, the plastic coating 210 can be produced from a first plastic and the outer element 21 from a second plastic in one process step. In the case of production in one method step, it can be ensured that the first plastic and the second plastic are bonded to one another.

The method described in connection with FIG. 10 is particularly suitable for producing a plastic coating 210 on the thread 202 of a spindle nut. Reference List

1 adjustment assembly

2 first adjustment part

20 first adjustment part body

202 first thread

203, 203' thread crests

204 thread pitch

205 recess

206 projection 207 toothing 21 outer element 210 plastic coating 211 external toothing 212 external thread

3 second adjustment part

30 plastic coating

31 second adjustment part body

32 second thread

4 receiving bodies

40 counter thread

401 holding section

402 gap section

A distance

B, B' flank width

C contact surface

D thickness

E cutting plane

G threaded axis

R, R' radius

S, S' gap a1, a2, b1, b2 flank angle

Claims

Expectations

1. adjustment assembly (1) for an adjustment drive of a motor vehicle, with

- A first adjusting part (2) with a first thread (202) and

- A second adjustment part (3) with a second thread (32) which is in engagement with the first thread (202), wherein

- At least one of the threads (202, 32) has a plastic coating (210, 30), characterized in that the plastic coating (210, 30) covers the at least one thread (202, 32) by more than 50%.

2. adjustment assembly (1) according to claim 1, characterized in that the first and / or the second thread (202, 32) is single-start.

3. adjustment assembly (1) according to any one of claims 1 or 2, characterized in that the first and / or the second adjustment part (2, 3) consists of metal.

4. adjustment assembly (1) according to any one of claims 1 to 3, characterized in that the first adjustment part (2) is a spindle nut and the second adjustment part (3) is a spindle.

5. adjustment assembly (1) according to any one of the preceding claims, characterized in that the plastic coating (210, 30) covers the at least one thread (202, 32) to less than 100%.

6. Adjustment assembly (1) according to one of the preceding claims, characterized in that the at least one thread (202, 32) has a first section covered by the plastic coating (210, 30) and a second section which is not covered by the plastic coating (210 , 30) is covered.

7. Adjustment assembly (1) according to Claim 6, characterized in that the second section has an axial length which corresponds to at least one revolution of the thread, in particular a maximum of four revolutions of the thread, of the at least one thread (202, 32) and/or that the second section a has an axial length which is at most 20%, in particular at most 15%, in particular at most 10%, of a total length of the at least one thread (202, 32).

8. adjustment assembly (1) according to any one of claims 6 or 7, characterized in that the second section is arranged at one of the ends of the at least one thread (202, 32).

9. Adjustment assembly (1) according to one of the preceding claims, characterized in that the plastic coating (210, 30) on a load end of the at least one thread (202, 32) facing thread flank of the at least one thread (202, 32) has a greater thickness (D) has a thread flank of the at least one thread (202, 32) facing away from the load end of the at least one thread (202, 32).

10. adjustment assembly (1) according to any one of the preceding claims, characterized in that a thickness (D) of the plastic coating (210, 30) varies periodically along the at least one thread (202).

11. adjustment assembly (1) according to any one of claims 1 to 8, characterized in that the plastic coating (210, 30) has a constant thickness (D).

12. adjustment assembly (1) according to any one of the preceding claims, characterized in that the plastic coating (210, 30) forms a profile of the at least one thread (202, 32).

13. Adjustment assembly (1) according to one of the preceding claims, characterized in that the at least one thread (202, 32) has a first profile shape on a first profile section and a second profile shape on a second profile section, which is different from the first profile shape.

14. adjustment assembly (1) according to any one of the preceding claims, characterized in that the at least one thread (202, 32) and the

Plastic coating (210, 30) on the at least one thread (202, 32) have identical and/or different flank angles (a1, a2, b1, b2).

15. adjustment assembly (1) according to any one of the preceding claims, characterized in that the at least one thread (202, 32) at least one Has a recess (205) that is filled with plastic and/or has an uneven surface topography, in particular defects and/or roughness, so that between the at least one thread (202, 32) and the plastic coating (210, 30) there is at least partially a there is a positive fit.

16. Adjustment assembly (1) according to claim 15, characterized in that the at least one recess (205) extends longitudinally along a thread axis (G) of the at least one thread (202, 32) and/or the at least one recess (205) extends radially the thread axis (G) extends in the at least one thread (202, 32).

17. adjustment assembly (1) according to any one of the preceding claims, characterized in that at least one of the adjustment parts (2, 3) has an outer element (21) which is integrally formed with the plastic coating (210, 30).

18 adjustment assembly (1) according to claim 17, characterized in that the outer element (21) and the plastic coating (210, 30) with a

Injection molding process were injected together in one step, so that the outer element (23) merges seamlessly into the plastic coating (210, 30).

19. A method for producing an adjustment part (2, 3) with a thread (202, 32) for an adjustment assembly (1), comprising the steps:

- Providing the adjustment part (2, 3) with the thread (202, 32),

- Providing a receiving body (4) with a mating thread (40), which has a holding section (401) which is designed so that the thread (202, 32) thereon can engage in the mating thread (40), and a gap section (402) having a radius (R') different from the radius (R) of the holding portion (401), and

- Arranging the adjustment part (2, 3) on the receiving body (4) so that the adjustment part (2, 3) is held on the holding section (401) and a gap (S) is formed on the gap section (402), characterized in that that plastic is introduced into the gap (S).

20. A method for producing an adjustment part (2, 3) with a thread (202, 32) for an adjustment assembly (1), in particular according to claim 19, comprising the steps:

- Providing the adjustment part (2, 3) with the thread (202, 32),

- Providing a receiving body (4) with a mating thread (40), which has a holding section (401) which is designed so that the thread (202, 32) thereon can engage in the mating thread (40), and a gap section (402) has whose flank width (B') is different from the flank width (B) of the holding section (401), and

21. The method according to any one of claims 19 and 20, characterized in that the plastic is introduced into the gap (S) along a direction parallel to a thread axis (G) of the thread (202, 32).

22. The method according to any one of claims 19 to 21, characterized in that the plastic is introduced into the gap (S) over the entire circumference of the thread (202, 32).

23. The method according to any one of claims 19 to 22, characterized in that the introduction of the plastic takes place by filling the gap (S) with plastic melt.

24. The method according to any one of claims 19 to 23, characterized in that the arrangement of the adjustment part (2, 3) on the receiving body (4) by turning the adjustment part (2, 3) in or out.

25. The method according to any one of claims 19 to 24, characterized in that simultaneously with the introduction of the plastic into the gap (S), an outer element (21) of the adjustment part (2, 3) is formed.

26. The method according to any one of claims 19 to 25, characterized in that the adjustment part (2, 3) is axially aligned when being arranged on the receiving body (4) via a contact surface (C) of the receiving body (4) and/or that the adjusting part (2, 3) when being arranged on the receiving body (4) via the Flank width (B) is rotationally aligned.