Attachment assembly and method of assembly

Abstract

The invention relates to a front attachment (30) for a linear drive (10), an ejector tube (40) for a linear drive (10), an attachment assembly (20) formed by the front attachment (30) and the ejector tube (40), a linear drive (10) having the attachment assembly (20), and a method (100) for assembling the attachment assembly (20). The front attachment (30) comprises an attachment body (32) having a first mounting section (A) for attaching an external load to the front attachment (30) and a second mounting section (B) for rotationally mounting the front attachment (30) to the front end (44) of the pusher tube (40).

Description

Technical Field

[0001] The present invention relates to a front attachment for a linear actuator, a push tube for a linear actuator, an attachment assembly formed by the front attachment and the push tube, a linear actuator having the attachment assembly, and a method for assembling the attachment assembly. Background Art

[0002] For moving machine parts or other components, linear actuators are known in the art. Linear units include linear units having a spindle or screw, and a nut that mates with the spindle or screw, such that a rotational movement, for example of a motor shaft, is converted into a linear movement. To transmit this linear movement to a machine part or other component, a push tube is typically attached to the rotationally fixed nut. A front attachment is screwed onto or into the front end of the push tube, the front attachment including a mounting section configured to be mounted to a machine part or other component. While this configuration allows for a direct transfer of force, it can also cause undue strain on the linear unit and even the motor if the machine part or other component is moved externally. Additionally, adjusting the orientation of the front attachment relative to the push tube can be problematic and / or require a great deal of effort, for example in order to effectively mount a machine part or other component to the front attachment.

[0003] Based on this background, the object of the present invention is to improve the mounting of the front attachment to the push tube, in particular to provide a connection between the front attachment and the push tube to facilitate the mounting of a machine part or other component to the front attachment.

[0004] This object is achieved by the front attachment, push tube, attachment assembly, linear actuator and method for assembling the attachment assembly as described in the independent claims.

[0005] Preferred embodiments are defined in the dependent claims and the following description. Summary of the Invention

[0006] According to a first aspect of the present invention, a front attachment for a linear actuator includes an attachment body having a first mounting section for attaching an external load to the front attachment, and a second mounting section for rotatably mounting the front attachment to the front end of a push tube, in particular to the push tube of a linear actuator according to a second aspect of the present invention.

[0007] A front attachment rotatably mounted to a push tube in the sense of the present invention is a front attachment mounted to the push tube in an axially fixed but circumferentially movable manner.

[0008] One aspect of the present invention is based on a method of establishing a mechanical connection between a front attachment and a push tube, which mechanical connection allows the front attachment to rotate relative to the push tube. To this end, the attachment body of the front attachment is configured, i.e., specifically designed and / or shaped and / or prepared, to be rotatably mounted on the push tube. This allows the front attachment to rotate freely relative to the push tube, thus facilitating the mounting of a load (e.g., a machine part or any other component) on the front attachment, regardless of the orientation of the push tube or the associated linear drive relative to the load. In particular, the (rotational) orientation of the front attachment relative to the push tube can be changed without separately affecting the extension length of the linear drive or the push tube.

[0009] Advantageously, the attachment body includes first and second mounting sections. The first mounting section is preferably used for mounting a load on the front attachment, while the second mounting section is preferably used for rotatably mounting the front attachment on the push tube. For example, within the second mounting section, the attachment body can be configured, specifically shaped, to cooperate with the front end of the push tube to establish a rotatable connection. In particular, within the second mounting section, the attachment body can be configured, specifically shaped, to form a bearing with the front end of the push tube. For example, the attachment body can be configured, specifically shaped, to establish a rolling element connection with the front end of the push tube.

[0010] Preferred embodiments of the present invention and further aspects thereof are described below, and each aspect can be combined with each other as needed and with the aspects of the present invention described below, unless explicitly excluded.

[0011] In a preferred embodiment, the attachment body includes an annular groove, which is preferably arranged in the second mounting section and forms a raceway for a plurality of rolling elements. The groove advantageously has a concave form, such as spherical. The rolling elements can be balls, rollers, etc. Preferably, the groove is arranged such that when the front attachment is arranged at the front end of the push tube, it forms a passage for the rolling elements together with a complementary groove in the third mounting section of the push tube. When the rolling elements are inserted between the push tube and the attachment body, the groove can axially fix the attachment body relative to the push tube while still allowing rotational movement with low friction.

[0012] In another preferred embodiment, the attachment body includes a recess for receiving the front end of the push tube, which recess is advantageously cylindrical. The recess can be formed as a cavity. Preferably, an annular groove is formed in the inner (circumferential) surface of the recess. This recess allows the push tube and the attachment body to axially overlap. Thus, the rolling elements can be radially arranged between the push tube and the attachment body or the inner surface, respectively.

[0013] Preferably, the inner surface of the recess defines the second mounting section.

[0014] Alternatively, an annular groove may be formed on the outer (circumferential) surface of the attachment body. Thus, at least a portion of the outer surface may define a second mounting section. To this end, the attachment body may even include a dedicated projection, advantageously cylindrical, for insertion into the front end of the (hollow) push tube. Thus, the outer surface of the projection defines the second mounting section.

[0015] In another preferred embodiment, the attachment body includes a through-hole, advantageously radial, for inserting rolling elements when the front attachment is rotatably mounted to the front end of the push tube. The through-hole preferably connects the outer surface of the attachment body to the second mounting section, in particular to the inner surface of the recess, such as an annular groove. The through-hole may facilitate quick and reliable assembly, i.e., mounting the front attachment to the push tube. Furthermore, by providing a through-hole in the attachment body, the rolling elements can be arranged between the front attachment and the push tube even if the attachment body is a single piece, i.e., formed as a single unit.

[0016] In another preferred embodiment, a closure is provided for closing the through-hole when the front attachment is rotatably mounted to the front end of the push tube. The closure may be a lid, a plug, a screw plug, etc. When the front attachment is mounted to the push tube, the closure can fix the rolling elements within the rolling element channel.

[0017] In another preferred embodiment, the attachment body includes a ventilation duct leading to the second mounting section. Preferably, the ventilation duct connects the outer surface of the attachment body to the second mounting section, in particular to the inner surface of the recess, such as an annular groove. The ventilation duct allows air or pressure compensation within the second mounting section, respectively. Thus, the ventilation duct can facilitate the insertion of the rolling elements into the through-hole, respectively, into the rolling element channel formed between the push tube and the attachment body.

[0018] In another preferred embodiment, a sealing element is provided for sealing the ventilation duct when the front attachment is rotatably mounted to the front end of the push tube. The sealing element may be a sealing screw that can be screwed into the internal thread of the ventilation duct. With the aid of the sealing element, the second mounting section or the rolling element channel formed between the push tube and the attachment body can be protected from contamination, e.g., by particulate matter such as dust and / or fluid.

[0019] In another preferred embodiment, an O-ring is provided for sealing the second mounting section when the front attachment is rotatably mounted to the front end of the push tube. Preferably, the O-ring is arranged within an annular sealing groove of the attachment body. The O-ring or the sealing groove is advantageously arranged within the second mounting section or axially adjacent to the second mounting section, in particular axially adjacent to the annular groove of the attachment body. Providing such an O-ring can help prevent contamination of the bearing formed by the push tube and the front attachment.

[0020] According to a second aspect of the present invention, the push tube for a linear drive comprises a tube body having a third mounting zone for rotatably mounting a front attachment (in particular according to the first aspect of the present invention) to the front end of the push tube. This allows the front attachment to rotate freely relative to the push tube, thus facilitating the mounting of a load to the front attachment, regardless of the orientation of the push tube or the associated linear drive relative to the load. In particular, the (rotational) orientation of the front attachment relative to the push tube can be changed without separately affecting the extension length of the linear drive or the push tube.

[0021] Preferably, within the third mounting section, the tube body is configured and in particular shaped to cooperate with a second mounting section of the front attachment, thereby establishing a rotatable connection. In particular, within the third mounting section, the tube body can be configured and in particular shaped to form a bearing with the front attachment. For example, the tube body can be configured and in particular shaped to establish a rolling element connection with the front attachment.

[0022] In a preferred embodiment, the tube body comprises an annular groove, preferably arranged in the third mounting section, forming a raceway for a plurality of rolling elements. The groove advantageously has a concave form, for example spherical. Preferably, the groove is arranged such that when the front attachment is arranged at the front end of the push tube, it forms a passage for the rolling elements together with a complementary groove in the second mounting section of the front attachment. When the rolling elements are arranged radially between the front attachment and the tube body, the groove can axially fix the front attachment relative to the push tube while still allowing rotational movement with low friction.

[0023] In another preferred embodiment, the annular groove is formed on the outer (circumferential) surface of the push tube. Thus, the rolling elements can be inserted or arranged radially respectively between the attachment body and the outer surface of the tube body or the push tube. Preferably, at least a part of the outer surface defines the third mounting section.

[0024] Alternatively, the annular groove is formed on the inner surface of the (hollow) push tube. In this case, the groove can cooperate with a complementary groove on the outer surface of the front attachment at least indirectly (e.g., via a plurality of rolling elements). At least a part of the inner surface of the push tube can thus define the third mounting section.

[0025] If the third mounting section is arranged on the inner surface, the tube body can comprise the above-mentioned through holes and / or ventilation ducts in combination with the front attachment. Similarly, the push tube can be provided with a closure for closing the through holes and / or a sealing element for sealing the ventilation ducts. The above-mentioned technical effects and advantages apply accordingly here.

[0026] According to a third aspect of the invention, an attachment assembly for a linear drive includes a push tube according to the second aspect of the invention and a front attachment according to the first aspect of the invention. This allows the front attachment to rotate freely relative to the push tube, thus facilitating the mounting of a load onto the front attachment, regardless of the orientation of the push tube or the associated linear drive relative to the load. In particular, the (rotational) orientation of the front attachment relative to the push tube can be changed without respectively affecting the extended length of the linear drive or the push tube.

[0027] According to a fourth aspect of the invention, a linear drive includes an attachment assembly according to the third aspect of the invention. The linear drive can be used in a particularly flexible manner since its orientation can be independent of the orientation of the mounting point on the load. The front attachment of the attachment assembly can be easily adapted to the required (rotational) orientation without affecting the extended length of the linear drive.

[0028] According to a fifth aspect of the invention, a method of assembling an attachment assembly (in particular according to the fourth aspect of the invention) includes i) arranging a front attachment (in particular according to the first aspect of the invention) and a push tube (in particular according to the second aspect of the invention) such that a second mounting section of an attachment body of the front attachment is axially aligned with a third mounting section of a tube body of the push tube, and ii) radially arranging a plurality of rolling elements between the push tube in the third mounting section and the front attachment in the second mounting section.

[0029] An axially aligned arrangement of the second and third mounting sections in the sense of the present invention is preferably an arrangement defined by an axial overlap of the second and third mounting sections. In particular, it can be an arrangement in which the second mounting section can cooperate with the third mounting section at least indirectly (e.g., via a plurality of rolling elements). For example, it can be an arrangement in which the second mounting section faces the third mounting section, preferably such that an annular groove of the attachment body and a corresponding annular groove of the tube body form a rolling element channel.

[0030] Assembling the attachment assembly in the above manner can greatly facilitate the assembly while providing independence of the rotational orientation of the front attachment relative to the push tube.

[0031] In a preferred embodiment, the rolling elements are inserted into a through hole of the attachment body, which is advantageously a radial through hole. Alternatively, the rolling elements are inserted into a through hole of the tube body, which is advantageously a radial through hole. Preferably, upon insertion, the rolling elements are guided through the through hole into a rolling element channel formed between the attachment body and the tube body within the second or third mounting section, respectively.

[0032] Preferably, after inserting the rolling elements, the through hole is closed, for example, by inserting a screw plug into the through hole. In this way, the rolling elements can be fixed in the rolling element channel.

[0033] In another preferred embodiment, after the rolling elements are arranged in the rolling element channels, the ventilation ducts leading to the rolling element channels are sealed. The ventilation ducts are formed radially between the attachment body and the pipe body by arranging a front attachment (e.g., in a predetermined manner) at the push tube. The ventilation ducts are preferably sealed by screwing a sealing screw into the internal thread of the ventilation duct. By sealing the ventilation ducts, the rolling element channels can be protected from contamination.

[0034] The above-described characteristics, features, and advantages of the present invention, as well as the ways to achieve them, will be described in more detail in the following exemplary description in conjunction with the accompanying drawings. Where appropriate, the same reference numerals are used for the same or corresponding elements of the present invention in the figures. The examples are used to explain the present invention and do not limit the present invention to the combinations of features indicated therein, even in terms of functional features. Furthermore, any features disclosed in the above description and the following examples can be considered separately and appropriately combined with the features of any of the above embodiments and their further aspects. In particular, each of the features described above and below can be considered alone or in combination with other features among the described features, and combined with the front attachment according to the first aspect of the present invention, the push tube according to the second aspect of the present invention, the attachment assembly according to the third aspect of the present invention, the linear drive according to the fourth aspect of the present invention, and the method according to the fifth aspect of the present invention. Description of the Drawings

[0035] At least partially schematically shown in the drawings are:

[0036] Figure 1 An example of a linear drive;

[0037] Figure 2 An example of an attachment assembly in an axial cross-section;

[0038] Figure 3 For Figure 2 a radial cross-section of the attachment assembly in;

[0039] Figure 4 An example of a method for assembling the attachment assembly. Detailed Description of the Invention

[0040] Figure 1 An example of the linear drive 10 is shown. The linear drive 10 includes a linear unit 12 for converting the rotational movement of a motor shaft (not shown) of, for example, a motor 14 into a linear movement. The linear unit 12 includes a main shaft 12a that cooperates with a nut 12b, and the main shaft 12a is operatively coupled to the motor via a gear 16. The linear unit 12 is arranged within a housing 18. In Figure 1 the figures, the components (or their parts) arranged within the housing 18 are shown in dashed lines.

[0041] In addition, the linear drive 10 includes an attachment assembly 20, which includes a front attachment 30 and a push tube 40. The push tube 40 is fixedly attached to the nut 12b. The front end 44 of the push tube 40 protrudes from the housing 18. The front attachment 30 is rotatably mounted to the push tube 40 at the front end 44, that is, it is mounted in a manner that allows the front attachment 30 to rotate relative to the push tube 40 about the longitudinal axis L of the push tube 40, as indicated by the double-headed arrow.

[0042] The front attachment 30 includes an attachment body 32. In a first mounting section A, the attachment body 32 is configured to mount an external load (e.g., a machine part) to the front attachment 30. In this example, the first mounting section A is formed by an eyelet. The front attachment 30 is rotatable relative to the push tube 40, thereby allowing the first mounting section A (e.g., the eyelet) to be aligned with a corresponding mounting point of the external load without reorienting the linear drive 10.

[0043] Figure 2 An example of an axial cross-section of the attachment assembly 20 is shown. The attachment assembly 20 includes a front attachment 30 having an attachment body 32 and a push tube 40 having a tube body 42. The attachment body 32 includes a second mounting section B for rotatably mounting the attachment body 32 to the front end 44 of the push tube 40. Similarly, the tube body 42 includes a third mounting section C for rotatably mounting the front attachment 30 to the front end 44 of the push tube 40.

[0044] The attachment body 32 and the tube 42 each include an annular groove 36, 46 within the respective mounting sections B, C. In the shown mounted state of the front attachment 30 and the push tube 40, that is, in the assembled state of the attachment assembly 20, in which the front attachment 30 is rotatably mounted to the push tube 40, the mounting sections B, C are arranged opposite to each other such that the annular grooves 36, 46 form a rolling element channel 22. A plurality of rolling elements 24 are arranged within the rolling element channel 22, thereby allowing relative rotation of the front attachment 30 and the push tube 40 while axially fixing the front attachment 30 to the push tube 40.

[0045] The attachment body 32 includes a through hole 34 that connects the outer circumferential surface 32a of the attachment body 32 to the second mounting section B. In particular, the through hole 34 leads to the rolling element channel 22, thereby allowing the rolling elements 24 to be inserted into the rolling element channel 22 when the front attachment 30 and the push tube 40 are arranged in corresponding relation to each other.

[0046] In order to fix the rolling elements 24 within the rolling element channel 22, the through hole 34 is preferably closed by a closure 50 (e.g., a screw plug). In this example, the screw plug is screwed into the internal thread 34a of the through hole 34.

[0047] The attachment body 32 further includes a ventilation duct 52 that connects the outer surface 32a of the attachment body 32 to the second mounting section B. In particular, similar to the through-hole 34, the ventilation duct 52 leads to the rolling element channel 22, thereby respectively allowing air or pressure compensation within the rolling element channel 22. This significantly facilitates the insertion of the rolling elements 24 into the rolling element channel 22.

[0048] The ventilation duct 52 can be sealed by a sealing element 54 (e.g., a sealing screw). In this example, the sealing screw is screwed into the internal thread 52a of the ventilation duct 52.

[0049] To protect the rolling element channel 22 from contamination, an O-ring 56 is arranged in the annular sealing groove 58 of the attachment body 32. Advantageously, the annular sealing groove 58 is axially adjacent to the annular groove 36.

[0050] In Figure 2 In the illustrated example, the second mounting section B or the annular groove 36 of the attachment body 32 is respectively formed on the inner circumferential surface 32b of the recess 38 of the attachment body 32. The recess 38 is preferably formed by an axial cavity within the attachment body 32. Accordingly, the third mounting section C or the annular groove 46 of the tube body 42 is respectively arranged on the outer surface 42a of the push tube 40.

[0051] In the illustrated mounted state, the attachment body 32 is pulled through the front end 44 of the push tube 40, particularly the third mounting section C. In particular, the front attachment 30 is arranged such that the attachment body 32 at least partially overlaps the front end 44 of the push tube 40 in the axial direction.

[0052] Of course, a complementary configuration of the attachment assembly 20 can also be envisaged. In the said complementary configuration, the second mounting section B or the annular groove 36 is respectively formed on the outer surface 32a of the attachment body 32. Accordingly, the third mounting section C or the annular groove 46 is respectively formed on the inner surface 42b of the (hollow) push tube 40. Of course, in this case, the outer diameter of the attachment body 32 in the second mounting section B must be smaller than the inner diameter of the push tube 40 such that at least a part of the attachment body 32 can be inserted into the front end 44 of the push tube 40.

[0053] Figure 3 Shown is Figure 1 a radial cross-section of the attachment assembly 20. The push tube 40 and the front attachment 30 are coaxially aligned such that the attachment body 32 at least partially axially (i.e., in a direction perpendicular to the plane of the drawing) overlaps the tube body 40.

[0054] A plurality of rolling elements 24 are circumferentially arranged around the tube body 42 within the rolling element channel 22 formed between the outer surface 42a of the push tube 40 and the inner surface 32b of the front attachment 30.

[0055] As Figure 3 shown, when the closure member 50 completely closes the through-hole 34, the tip 50a of the closure member 50 is substantially flush with at least a portion of the inner surface 32b of the attachment member body 32 in the second mounting section. Specifically, the tip 50a may be substantially flush with the bottom of the annular groove in the attachment member body 32. This allows the rolling elements 24 to roll unhindered within the rolling element channel 22.

[0056] In a similar manner, when the ventilation duct 52 is completely sealed, the tip 54a of the sealing element 54 is substantially flush with at least a portion of the inner surface 32b in the second mounting section. Specifically, the tip 54a may be substantially flush with the bottom of the annular groove in the attachment member body 32.

[0057] Figure 4 An example of a method 100 for assembling an attachment assembly for a linear actuator is shown. In method step S1, the front attachment member and the push tube are arranged such that the second mounting section of the attachment member body of the front attachment member is axially aligned with the third mounting section of the tube body of the push tube. Preferably, at least a portion of the attachment member body is pulled through the front end of the push tube such that the front end is received by the complementary recess of the attachment member body. In this arrangement, the second mounting section preferably faces the third mounting section such that a rolling element channel is formed between the tube body and the attachment member body, for example, by annular grooves respectively provided in the second and third mounting sections.

[0058] In method step S2, a plurality of rolling elements are arranged radially between the push tube in the third mounting section and the front attachment member in the second mounting section. The rolling elements are particularly arranged within the rolling element channel. For this purpose, the rolling elements are preferably inserted into a through-hole in the attachment member body that connects the outer surface of the front attachment member to the rolling element channel.

[0059] In method step S3, the through-hole is closed, for example, by a corresponding closure member. For example, a screw plug may be inserted into the through-hole.

[0060] In addition, in method step S3, the ventilation duct and the rolling element channel may be sealed, for example, by corresponding sealing elements. For example, a sealing screw may be screwed into the internal thread of the ventilation duct.

[0061] List of reference numerals

[0062] 10 Linear actuator

[0063] 12 Linear unit

[0064] 12a Spindle

[0065] 12b Nut

[0066] 14 Electric motor

[0067] 16 Gear

[0068] 18 Housing

[0069] 20 Attachment assembly

[0070] 22 Channel

[0071] 24 Rolling element

[0072] 30 Front attachment

[0073] 32 Attachment body

[0074] 32a Outer surface

[0075] 32b Inner surface

[0076] 34 Through-hole

[0077] 34a Thread

[0078] 36 Groove

[0079] 38 Recess

[0080] 40 Pusher tube

[0081] 42 Tube body

[0082] 42a Outer surface

[0083] 42b Inner surface

[0084] 44 Front end

[0085] 46 Groove

[0086] 50 Closer

[0087] 50a Tip

[0088] 52 Air duct

[0089] 52a Internal thread

[0090] 54 Sealing element

[0091] 54a Tip

[0092] 56 O-ring

[0093] 58 Sealing groove

[0094] 100 Method

[0095] S1 Arrange the pusher tube and the front attachment

[0096] S2 Arrange the rolling elements

[0097] S3 Close the through-hole and / or the ventilation duct

[0098] A first installation section

[0099] B second installation section

[0100] C third installation section

[0101] Axis L

Claims

1. A front attachment (30) for a linear actuator (10), comprising an attachment body (32), the attachment body including: A first mounting section (A) for attaching an external load to the front attachment (30), and A second mounting section (B) for rotatably mounting the front attachment (30) to the front end (44) of a push tube (40), in particular to the front end (44) of the push tube (40) of a linear actuator (10) according to any one of claims 9 or 10.

2. The front attachment (30) according to claim 1, wherein, The attachment body (32) includes an annular groove (36) that forms a raceway for a plurality of rolling elements (24).

3. The front attachment (30) according to claim 2, wherein, The attachment body (32) includes a recess (38) for receiving the front end (44) of the push tube (40), and the annular groove (36) is formed on the inner surface (32b) of the recess (38).

4. The front attachment (30) according to any one of the preceding claims, wherein, The attachment body (32) includes a through hole (34) for the insertion of the rolling elements (24) when the front attachment (30) is rotatably mounted to the front end (44) of the push tube (40).

5. The front attachment (30) according to claim 4, including a closure (50) for closing the through hole (34) when the front attachment (30) is rotatably mounted to the front end (44) of the push tube (40).

6. The front attachment (30) according to any one of the preceding claims, wherein, The attachment body (32) includes a ventilation duct (52) leading to the second mounting section (B).

7. The front attachment (30) according to claim 6, including a sealing element (54) for sealing the ventilation duct (52) when the front attachment (30) is rotatably mounted to the front end (44) of the push tube (40).

8. The front attachment (30) according to any one of the preceding claims, including an O-ring (56) for sealing the second mounting section (B) when the front attachment (30) is rotatably mounted to the front end (44) of the push tube (40).

9. A push tube (40) for a linear actuator (10), comprising a tube body (42), the tube body comprising: A third mounting section (C) for rotatably mounting the front attachment (30) to the front end (44) of the push tube (40), in particular the front attachment (30) according to any one of the preceding claims.

10. The push tube (40) according to claim 9, wherein, The tube body (42) includes an annular groove (46) that forms a raceway for a plurality of rolling elements (24).

11. The push tube (40) according to claim 10, wherein, The annular groove (46) is formed on the outer surface (42a) of the push tube (40).

12. An attachment assembly (20) for a linear actuator (10), comprising a push tube (40) according to any one of claims 9 to 11 and a front attachment (30) according to any one of claims 1 to 8, the front attachment (30) being rotatably mounted to the push tube (40).

13. A linear actuator (10), including the attachment assembly (20) according to claim 12.

14. A method (100) for assembling an attachment assembly (20), in particular according to claim 12, including: Arrange (S1) a front attachment (30), in particular a front attachment (30) according to any one of claims 1 to 8, and a push tube (40), in particular a push tube (40) according to any one of claims 9 to 11, such that a second mounting section (B) of an attachment body (32) of the front attachment (30) is axially aligned with a third mounting section (C) of a tube body (42) of the push tube (40), and radially arrange (S2) a plurality of rolling elements (24) between the push tube (40) in the third mounting section (C) and the front attachment (30) in the second mounting section (B).

15. The method (100) according to claim 14, wherein, Insert (S2) the rolling elements (24) into through-holes (34) of the attachment body (32), and seal (S3) the through-holes (34) after insertion of the rolling elements (24).

16. The method (100) according to claim 14 or 15, wherein, By arranging (S1) the front attachment (30) and the push tube (40), a rolling element channel (22) is formed radially between the attachment body (32) and the tube body (42), and after the rolling element channel (22) has been arranged (S2) within the rolling element channel (22), seal (S3) a ventilation duct (52) leading to the rolling element channel (22).

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