Automotive seat support slider

Abstract

A slider (1) for a motor vehicle seat support mounted on a metal rail (2) and lockable in different positions along a sliding direction (25), the slider (1) comprising an extended base part (3) and an extended upper part (4), said base part (3) and said upper part (4) being connected by a narrowed part (13), the base part (3) comprising two lateral guide parts (5, 5') with guide projections (6, 6') pointing towards the upper part (4) and forming, together with said narrowed part (13), a groove (12) on each side, the slider (1) essentially consisting of fibre reinforced polyamide.

Description

[Technical field]

[0001] The present invention relates to a slider (often referred to as an upper rail) for an automobile seat support, and to a method of making such an upper rail, as well as a method of using such an upper rail. [Background technology]

[0002] The car seat is slidably mounted on the chassis so that it can adapt its position to the size of the driver. For this purpose, there are provided metal rails (lower rails) fixedly attached to the floor of the passenger area and arranged essentially along the direction of travel, and upper slide rails or sliders attached to the car seat and suitable and adapted to slide within these lower metal rails. An actuator is provided for manually unlocking and locking the sliders, by means of which the car seat can be fixed in the desired position, the corresponding locking usually being performed by a foam closure.

[0003] DE 3522773 A1 discloses a vehicle seat having two base rails attached to a floor section of the vehicle and two upper rails attached to a seat assembly and connected to seat cords attached thereto. Each base rail and each upper rail has a first and a second flange extending therefrom. The first flange of the base rail is provided with a bearing, in each case made of plastic or nylon. The first flange of the upper rail receives the first flange of the base rail to form a U-shape for receiving the bearing. The second flanges of the base rail and the upper rail have complementary cross-sectional shapes. When the upper rail is subjected to a certain force via the seat cords, the second flange of the base rail and the flange of the upper rail abut against each other, so that the upper rail is held interconnected with the lower rail.

[0004] U.S. Patent No. 4,274,293 discloses a mechanism using a drive block with mounting lugs on both transverse sides of the block for mounting in slots on opposite sides of a C-shaped bracket. The bracket slot is T-shaped, with the body of the T receiving the mounting lugs as a passageway into a circular T-head opening. By rotating the block 90 degrees, the lugs fit into the circular opening and are held in place. Each lug has a necked-down section that passes through a slotted opening in the bracket. Each lug has an enlarged head that extends outward from the bracket side to prevent the bracket side from spreading in response to impact forces acting on the seat track. The block has a central threaded opening that receives a lead screw that drives the seat track in response to rotation of the lead screw. The bracket is secured to the seat track and the drive block is inserted into the bracket and rotated into position to engage the lead screw.

[0005] EP 1 731 352 A1 discloses a method for longitudinal movement of a seat by sliding an upper rail, permanently joined to the underside of the seat, along a lower rail, fixed to the floor of the vehicle. Both rails are provided with lateral boundaries that are bent to engage with each other. One of the joining areas is provided with a sliding unit assembled from a number of spherical elements. A wedge-shaped, plastic support element is positioned along one side of the bottom of the lower rail to prevent the seat from tilting backwards or to the side when pulled to the front or rearmost position.

[0006] US Patent Publication No. 2010067999 relates to a fastener assembly having a rail and a fastener device that can be installed on a transportation vehicle, characterized in that the rail head is coated with an alumina layer having a polytetrafluoroethylene seal, and at least a portion of the fastener device that contacts the rail head is made of metal coated with a polymer layer. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] DE 3522773 A1 [Patent Document 2] U.S. Pat. No. 4,274,293 [Patent Document 3] European Patent Publication No. 1731352 [Patent Document 4] US Patent Publication No. 2010067999 Summary of the Invention

[0008] It is an object of the present invention to provide an improved design of an upper rail or slider for an automobile seat support. The terms "upper rail" and "slider" are to be understood as synonyms herein.

[0009] In particular, the invention relates to a slider according to claim 1. What is proposed is a slider for a car seat support that can be locked in different positions along the sliding direction and that can be mounted on a metal rail, also called the lower metal rail.

[0010] According to the invention, a slider comprises an enlarged base portion and an enlarged upper portion, said base portion and said upper portion being connected by a narrowed portion.

[0011] Furthermore, the base portion according to the invention preferably comprises two lateral guide portions with guide projections pointing upwards towards the upper portion and, together with the narrowed portion, form a groove on each side.

[0012] Further according to the invention, the slider consists essentially of fiber-reinforced polyamide, preferably endless fiber-reinforced polyamide.

[0013] The new design proposed provides the necessary stability, even in unexpected and highly stressed situations. The slider, despite being made of thermoplastic fiber reinforced or endless fiber reinforced polyamide material, has sufficient strain at break properties and allows all the same functions as a metal rail (lower rail), but offers lighter weight and easier handling, as well as easier manufacturing and assembly. The slider according to the invention is particularly low friction and low noise.

[0014] According to a first preferred embodiment, the base part, in an intermediate region along the sliding direction, comprises at least one through-opening which is penetrated by at least one tooth of at least one locking lever.

[0015] Preferably, a window is disposed above said intermediate region, the window defining a transverse through opening allowing the passage of a corresponding metal lever for fixing the slider in a particular desired position.

[0016] More preferably, there are no lateral guide portions in the intermediate region.

[0017] Preferably, the through opening is provided with a metal sleeve, preferably having a wall thickness in the range of 0.5-5 mm, preferably in the range of 1.0-3 mm, more preferably the metal of the sleeve is selected from the group consisting of iron and its alloys, in particular steel, preferably stainless steel.

[0018] In particular, a metal sleeve fitted inside a corresponding opening in a thermoplastic fibre reinforced polyamide material can achieve the required mechanical properties.

[0019] According to yet another preferred embodiment, said grooves have a transverse width (a4) in the range of 2 to 10 mm, preferably in the range of 4 to 8 mm.

[0020] The slider according to the invention is preferably characterized in that said groove has an at least partially rounded bottom. In fact, it has been found that in order to obtain a high mechanical stability, the shape of the groove when using thermoplastic fiber-reinforced polyamide materials can be important. A rounded shape can contribute significantly to the stability.

[0021] Preferably, the rounded base has a radius R in the range of 1 to 5 mm, preferably in the range of 1 to 3 mm.

[0022] Preferably, the shape of the rounded bottom is rounded at the transition from said narrowed portion having a larger radius R and forms with the inner surface of the respective guide protrusion a sharp or essentially sharp edge or a more rounded transition with a smaller radius, the smaller radius being preferably in the range of 0.1 to 1 mm, more preferably in the range of 0.2 to 0.7 mm.

[0023] More preferably, said upper part comprises at least one cutout for a retaining pin, preferably a metal retaining pin made of iron ore and its alloys, in particular steel or stainless steel, which is oriented essentially along the sliding direction and below said retaining pin there is a passage opening with a rounded lower surface in the lower part. As well as in the specific situation with thermoplastic fiber-reinforced polyamide materials for the slider, this rounded bottom shape contributes significantly to the stability under mechanical load.

[0024] The rounded lower surface at the base essentially preferably forms a semi-cylindrical surface having a horizontal axis essentially perpendicular to the sliding direction.

[0025] The diameter d1 of the rounded lower surface is preferably in the range of 10 to 40 mm, more preferably in the range of 20 to 30 mm.

[0026] As regards dimensions, particularly in the context of using glass fiber reinforced thermoplastic polyamide material for the slider, they are preferably as follows: The transverse width a1 of the narrowed portion is selected to be in the range of 10 to 20 mm, preferably in the range of 12 to 16 mm, and / or the transverse width a5 of the guide protrusion is selected to be in the range of 5 to 15 mm, preferably in the range of 7.5 to 12 mm, and / or the height a7 of the guide protrusion is selected to be in the range of 15 to 30 mm, preferably in the range of 20 to 30 mm, and / or the height a6 of the groove is selected to be in the range of 4 to 12 mm, preferably in the range of 7 to 11 mm, and / or the total transverse width w of the bottom is selected to be in the range of 30 to 60 mm, preferably in the range of 40 to 50 mm.

[0027] The narrowed portion as viewed in cross section is preferably essentially conical in shape and expands to a proportionate width, and the upper surface as viewed in cross section is preferably rounded with a radius in the range 10-30 mm, preferably 15-25 mm.

[0028] More preferably, the slider comprises or essentially consists of a (glass) fiber-reinforced blend (A) of an aliphatic polyamide (A1) and at least one partially aromatic thermoplastic polyamide (A2), or a mixture of aromatic thermoplastic polyamides (A2), which may preferably be partially aromatic thermoplastic amorphous polyamides.

[0029] Preferably, the polyamide mixture (A) is (A1) 65 to 85 parts by weight of an aliphatic polyamide, preferably one having a glass transition temperature, measured on the unmodified material according to ISO 11357-2:2020, of greater than 70° C., preferably selected from the group consisting of PA6, PA66, PA66 / 6, PA610 and mixtures thereof; (A2) 15 to 35 parts by weight of an amorphous polyamide, (A2-1) 60 to 100 parts by weight, preferably 60 to 80 parts by weight, particularly preferably 60 to 65 parts by weight or 67 parts by weight of polyamide units derived from isophthalic acid and hexamethylenediamine (1,6-hexanediamine) in a substantially equimolar ratio; (A2-2) 0 to 40 parts by weight, preferably 20 to 40 parts by weight, more preferably 30 to 35 parts by weight or 33 parts by weight of a polyamide unit derived from terephthalic acid and hexamethylenediamine in a substantially equimolar ratio; An amorphous polyamide consisting of; It consists of: The parts by weight of components (A2-1) and (A2-2) together give 100 total parts by weight of polyamide 6I / 6T (A2), and the parts by weight of components (A1) and (A2) together give 100 total parts by weight of polyamide mixture (A).

[0030] Regarding the total amount of materials, preferably, the polyamide mixture (A) is added in a proportion of 60 to 30% by weight, and fiber (B), preferably glass fiber, is added in a range of 40 to 70% by weight, preferably 45 to 65% by weight, and additive (C) is added in a proportion of 0 to 5% by weight, preferably 0.1 to 2% by weight, if necessary, and the total amount of materials of the slider is given by the sum of (A) to (C).

[0031] The additives may be selected from the group consisting of: polyamides different from (A); UV stabilizers; heat stabilizers; flame retardants, free radical scavengers, processing aids; anti-inclusion agents; lubricants; mold release agents (including metal stearates and metal montanates), where the metals are preferably selected from the group consisting of magnesium, calcium, mineral oils and fatty acid amides; plasticizers; impact modifiers; fillers and / or agglomerates; optical brighteners; dyes and mixtures thereof, where the fillers and / or agglomerates are preferably nanoscale, and / or selected from the group of minerals including glass beads, carbon black, graphite, titanium dioxide, calcium carbonate and barium sulfate.

[0032] Preferably, the fiber reinforcement is an endless or long fiber reinforcement and the number average length of the fibers in the upper rail / slider is greater than 0.5 mm, preferably greater than 0.7 mm, more preferably in the range 0.5-5 mm, more preferably in the range 0.7-3 mm.

[0033] The fiber reinforcement is typically a carbon fiber or glass fiber reinforcement, preferably a glass fiber reinforcement selected from the group consisting of E-glass, ECR-glass, M-glass, S-glass, C-glass, or combinations thereof.

[0034] If the endless or long fibers are glass fibers, they preferably consist of fibers with a diameter in the range of 10 to 25 μm, preferably 11 to 18 μm. If the endless or long fibers are carbon fibers, they preferably consist of fibers with a diameter in the range of 3 to 12 μm, preferably 4 to 10 μm.

[0035] Preferably, the slider or the slider material has a heat distortion temperature HDT-A (1.8 MPa) of at least 200°C, preferably at least 240°C, preferably in the range 240-260°C, and / or with 50% or more by weight glass fiber reinforcement a heat distortion temperature HDT-C (8 MPa) of at least 190°C, preferably at least 200°C, preferably in the range 210-230°C.

[0036] The present invention further relates to a method for producing a slider according to any of the previous claims, produced by an injection moulding or injection compression moulding process starting from long fibre reinforced pellets having a length in the range of 3-25 mm, preferably 4-12 mm.

[0037] The invention also relates to a motor vehicle equipped with at least one such slider. Further embodiments of the invention are defined in the dependent claims.

[0038] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the following drawings are for illustrating the preferred embodiments of the present invention and are not intended to limit the present invention. [Brief description of the drawings]

[0039] [Figure 1] 1 shows a rail and slider for a car seat in a perspective view. [Diagram 2] 2A) a cross-sectional view perpendicular to the sliding direction of the slider according to FIG. 1 and b) a bottom view with dimensions. [Diagram 3] a) Slider with enlarged view of the middle area for locking, b) general principle of the form closure lock, and c) side view of the cutout without the metal pin. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0040] Figure 1 shows a perspective view of a slider 1 and a metal rail 2. In figure 2a) a longitudinal section perpendicular to the sliding direction 25 is shown and in b) a detail of the foot section of the slider with dimensions is shown.

[0041] The slider 1 comprises a base part 3 and an upper part 4, each extending along a sliding direction 25. The slider 1 slides in a metal rail 2. The slider is made of a glass-fiber reinforced thermoplastic amorphous polyamide material.

[0042] The base part 3 comprises, in the upward direction, two lateral guide parts 5, each of which is provided with a guide projection 6. Between these guide projections 6, a slot 12 is formed, the outer surface of which is bounded by the inner surface 29 of the respective projection 6 and by a narrowed part 13 located between the base part 3 and the proportional part 4. Above the narrowed part 13, the proportional part widens in a conical part 28, reaching the final width of the widened part 14, the upper surface 29 of which is rounded. The widened part essentially defines an upper axis 15, along which the retaining pin 17 is also arranged.

[0043] At one end of the slider 1, a cutout 16 from the top is provided in which a retaining pin 17 is mounted in a direction substantially parallel to the sliding direction. The retaining pin is provided for fixing the actual seat structure to the slider. Below the retaining pin 17, a passage opening 18 is provided.

[0044] In the middle portion of the slider 1 there is a window 26 which provides a through opening between the flared portion 14 and the base portion 3, which themselves extend essentially along the entire length of the slider, the function of which will be explained in more detail below.

[0045] As can be seen in Figure 2a, the metal rail 2 typically has a bottom 8 followed by two side walls 9 and then an inwardly facing horizontal portion 10, at the inner end of which there is in this case a downward portion 11, which passes through and engages with the above-mentioned slot 12 in the slider. Typically, the metal rail is manufactured in a stamping and forming process from a flat metal starting material.

[0046] The bottom surface 7 of the base part 3 slides on the upper surface of the bottom 8 of the metal rail. As mentioned above, the downwardly facing part 11 of the metal rail engages in a slot 12 between the narrowed part 13 and the guide projection. The slot 12 has a particular shape in order to provide maximum stability, i.e. it has a rounded bottom 27, which is asymmetric in the sense that it is smoothly rounded at the transition from the narrowed part 13 to the bottom, but transitions with an essentially sharp edge at the transition to the inner surface 30 of the guide projection 6. In fact, said shape has significantly improved the mechanical stability, especially when long glass fiber reinforced polyamide is used as the material of the slider.

[0047] The mechanism for locking the slider in a certain position, or the basic elements of said mechanism, are shown in figures 3a) and b). In the middle part of the slider, the aforementioned window 26 is provided. Below said window, the base part 3 does not have lateral guide parts, in other words the guide parts 5 are interrupted in the region of the window 26. In this middle region, the base part 3 is therefore narrower than in the end regions of the slider. In said narrow part, i.e. the locking section 19 of the slider, through-openings 20 are provided which penetrate transversely through the locking section 19. To ensure sufficient stability under load when using long-fiber-reinforced polyamide material for the slider, these openings 20 are provided with metal sleeves 21 mounted thereon. This increases the mechanical stability in the situation shown in figure 3b, i.e. when the teeth 23 of the locking lever 22, which are arranged in the region of the window 26, penetrate the openings 20 and engage with corresponding recesses in the metal rail.

[0048] Another important factor for achieving sufficient stability when using long fiber reinforced polyamide material for the slider is shown in figure 3c: it has been found to be beneficial to achieve sufficient mechanical stability if the passage opening 18 comprises a rounded lower surface 24, essentially given by a semi-cylindrical surface having an axis transverse to the sliding direction 25.

[0049] The materials of the slider are shown in Table 1. The slider was manufactured by injection molding and subsequent insertion of a metal sleeve 21 and a retaining pin. The slider was able to withstand conventional testing and no failure occurred under high loads when using corresponding designs.

[0050] Table 1: Compositions and properties of materials B1 to B4 used in the manufacture of sliders JPEG2025510805000002.jpg109158

[0051] The polyamide materials used were as follows: PA66 (A1) Polyamide 66 having a melting temperature of 260°C, measured on the unconditioned material according to ISO 11357-2:2020, and a relative viscosity of 1.8 at 20°C, measured in m-cresol at a concentration of 0.5% according to ISO 307 (2019). PA 6I / 6T (A2) Polyamide 6I / 6T containing 6I and 6T blocks in a ratio of 2:1, with a glass transition temperature of 125°C measured on the unconditioned material according to ISO 11357-2:2020 and a relative viscosity of 1.48 at 20°C measured in m-cresol at a concentration of 0.5% according to ISO 307.

[0052] The molding compositions having compositions B1 to B4 in Table 1 were prepared by mixing the polyamide blend A (components A1 and A2) with further additives (component C) and mixing and melting in a twin screw extruder before being transferred to an impregnation unit and contacted with preheated continuous filament glass fibres (GF roving 17 μm and GF roving 12 μm, continuous filament glass fibres).

[0053] Specifically, the pultrusion process proceeded as follows: Components A1, A2 and C were metered into the feed zone of a twin-screw extruder with a screw diameter of 40 mm. The components were then mixed while increasing the temperature profile from 270 °C to 340 °C. The extruder, tightly connected to the impregnation unit, conveyed the melt directly to the impregnation unit, where it impregnated the glass fibres preheated to 180 °C to 220 °C. The continuous glass fibres (1200 tex for 12 μm fibres and 2400 tex for 17 μm fibres) were passed through the impregnation zone at a speed of 8 to 15 meters per minute and passed through a heating zone at 340 to 400 °C. The strands thus impregnated were cut to lengths of 10 mm after cooling in water. After pelletization and drying at 110° C. for 24 hours, the pellet properties were measured and test specimens were prepared.

[0054] The test samples were produced on an Arburg Allrounder injection molding machine with the cylinder temperature set at 250°C to 350°C and the screw peripheral speed set at 15 m / min. The mold temperature was set at 80°C to 130°C. The following test samples were measured according to the following standards:

[0055] The tensile modulus was measured according to ISO 527 at a pulling speed of 1 mm / min, the yield stress, the ultimate tensile strength and the tensile strain at break were measured using ISO tensile test specimens (standard: ISO / CD 3167, type Al, 170x20 / 10x4 mm. The tensile modulus, the ultimate tensile strength and the tensile strain at break were measured perpendicular to the processing direction according to the above test.

[0056] The impact resistance and notched impact resistance were determined according to ISO 179 on ISO test specimens, standard: ISO / CD 3167, type B1, 80x10x4mm, at a temperature of 23°C.

[0057] The heat deflection temperature was measured according to ISO 75 (2013) using ISO impact test specimens of 80x10x4 mm in the form HDT A (1.8 MPa) and HDTC (8 MPa). [Explanation of symbols]

[0058] 1 Slider / Upper Rail 2 Metal / Lower Rail 3. Base part of 1 4. Upper part of 1 5 Side guide part 6 Guide protrusion 7 Bottom 8 bottom 9 side wall 10 horizontal part 11 Downward part 12 grooves 13 Stenosis 14 Enlarged section 15 Upper shaft 16 Cut-out 17 Retaining pin 18 Passage opening 19 Rock Section 20 Through opening 21 Metal sleeve 22 Lock lever 23 22 teeth 24 16 rounded underside 25 Slide direction 26 Windows 27 12 rounded bottom 28 Cone part 29 4 top Inside of 30 6 31 13 horizontal width A2 12 inner height A3 12 inner width A4 12 full width a5 6 width A6 12 total height a7 3 height b1 19 cross section d1 24 diameter R Radius w Total transverse width at bottom

Claims

1. A slider (1) for a vehicle seat support, mounted on a metal rail (2) and lockable in different positions along a sliding direction (25), comprising: The slider (1) comprises an expanded base portion (3) and an expanded upper portion (4), the base portion (3) and the upper portion (4) being connected by a narrowed portion (13), The base part (3) comprises two lateral guide parts (5, 5') with guide projections (6, 6') facing upwards towards the upper part (4) and, together with the narrowed part (13), form a groove (12) on each side, the slider (1) consisting essentially of fibre-reinforced polyamide.

2. said base part (3) comprises, in an intermediate region (19) along said sliding direction (25), at least one through opening (20) penetrated by at least one tooth (23) of at least one locking lever (22); 2. The slider (1) according to claim 1, wherein preferably a window (26) is arranged above the intermediate region (19) and / or preferably no lateral guide portions (5, 5') are present in the intermediate region (19).

3. The slider (1) according to claim 2, wherein the through opening (20) is provided with a metal sleeve (21) having a wall thickness preferably in the range of 0.5 to 5 mm, preferably in the range of 1.0 to 3 mm, further preferably the metal of the sleeve (21) is selected from the group consisting of iron and its alloys, in particular steel, preferably stainless steel.

4. Slider (1) according to any one of the preceding claims, wherein the groove (12) has a transverse width (a4) in the range of 2 to 10 mm, preferably in the range of 4 to 8 mm.

5. The groove (12) has an at least partially rounded bottom (27); Preferably, it has a radius (R) in the range of 1 to 5 mm, preferably in the range of 1 to 3 mm; And / or the shape of the preferably rounded bottom (27) is rounded at the transition from the narrowed portion (13) having a large radius (R) and forms a sharp edge or rounded transition with the inner surface (28) of the respective guide projection (6, 6') having a small radius, said small radius being preferably in the range of 0.1 to 1 mm, more preferably in the range of 0.2 to 0.7 mm.

6. 6. The slider (1) according to claim 1, wherein the upper part (4) comprises at least one cut-out (16) of a retaining pin (17), preferably a metal retaining pin made of iron ore and its alloys, in particular steel or stainless steel, said retaining pin (17) being oriented essentially along the sliding direction (25), below which there is a passage opening (18) with a rounded lower surface (24) towards the lower part (3), preferably said rounded lower surface (24) at the bottom forming substantially a semi-cylindrical surface with a horizontal axis essentially perpendicular to the sliding direction (25).

7. Slider (1) according to claim 6 or 7, wherein the diameter (d1) of the rounded lower surface (24) is in the range of 10 to 40 mm, preferably in the range of 20 to 30 mm.

8. the transverse width (a1) of said narrowed portion (13) is in the range of 10 to 20 mm, preferably in the range of 12 to 16 mm; and / or the lateral width (a5) of the guide projection (6) is in the range of 5 to 15 mm, preferably in the range of 7.5 to 12 mm; and / or the height (a7) of the guide protrusion (6) is in the range of 15 to 30 mm, preferably in the range of 20 to 30 mm; and / or the height (a6) of the groove (12) is in the range of 4 to 12 mm, preferably in the range of 7 to 11 mm; And / or a slider (1) according to any one of the preceding claims, wherein the total transverse width of the bottom (w) is in the range of 30 to 60 mm, preferably in the range of 40 to 50 mm.

9. A slider according to any one of claims 1 to 8, wherein the shape widens from the narrowed portion (13) in cross-section to a proportionate width in an essentially conical portion (28), preferably the upper surface (29) in cross-section is rounded, preferably with a radius in the range of 10 to 30 mm, preferably 15 to 25 mm.

10. said slider consisting essentially of a fiber-reinforced blend (A) of an aliphatic polyamide (A1) and a partially aromatic thermoplastic polyamide (A2); The polyamide blend (A) preferably comprises: (A1) 65 to 85 parts by weight of a partially crystalline aliphatic polyamide, preferably having a glass transition temperature, measured on the unmodified material according to ISO 11357-2:2020, of greater than 70° C., preferably selected from the group consisting of PA6, PA66, PA66 / 6, PA610 and mixtures thereof; (A2) 15 to 35 parts by weight of an amorphous partially aromatic polyamide, (A2_1) 60 to 100 parts by weight, preferably 60 to 80 parts by weight, particularly preferably 60 to 65 parts by weight or 67 parts by weight of polyamide units derived from isophthalic acid and hexamethylenediamine (1,6-hexanediamine) in a substantially equimolar ratio; (A2_2) 0 to 40 parts by weight, preferably 20 to 40 parts by weight, more preferably 30 to 35 parts by weight or 33 parts by weight of polyamide units derived from terephthalic acid in a substantially equimolar combination with hexamethylenediamine, An amorphous partially aromatic polyamide comprising: It consists of: The parts by weight of components (A2_1) and (A2_2) together give 100 total parts by weight of amorphous partially aromatic polyamide (A2), and the parts by weight of components (A1) and (A2) together give 100 total parts by weight of polyamide mixture (A), Preferably, said polyamide blend (A) contains fibers (B), preferably glass fibers, in the range of 40-70% by weight, preferably 45-65% by weight, and further preferably contains additive (C) in the range of 0-5% by weight, preferably 0.1-2% by weight, the total material of said slider being given by the sum of (A)-(C); A slider according to any one of claims 1 to 9.

11. the fibre reinforcement is an endless or long fibre reinforcement, the number average length of the fibres in the slider being greater than 0.5 mm, preferably greater than 0.7 mm, more preferably in the range of 0.5 to 5 mm, more preferably in the range of 0.7 to 3 mm; and / or the glass fibre reinforcement is made up of fibres with a diameter in the range of 10 to 25 μm, preferably in the range of 11 to 18 μm, and / or the carbon fibre reinforcement is made up of fibres with a diameter in the range of 3 to 12 μm, preferably in the range of 4 to 10 μm, 11. A slider according to claim 1, wherein the fibre reinforcement is a carbon fibre or glass fibre reinforcement, preferably selected from the group consisting of A-glass, C-glass, D-glass, E-glass, ECR-glass, M-glass, S-glass, R-glass or combinations thereof.

12. 12. A slider according to any one of claims 1 to 11, wherein the slider has a heat deflection temperature HDT-A of at least 200°C, preferably at least 240°C, preferably in the range of 240-260°C, and / or in each case 50 wt.-% of the glass fibre reinforcement a heat deflection temperature HDT-C of at least 190°C, preferably at least 200°C, preferably in the range of 210-230°C.

13. A method for manufacturing a slider according to any one of claims 1 to 12, wherein the slider is manufactured in an injection moulding process from long fibre reinforced pellets with a length in the range of 3 to 25 mm, preferably 4 to 12 mm.

14. A vehicle comprising a slider according to any one of claims 1 to 12.

15. Use of a slider according to any one of claims 1 to 14 as a slider for an automobile seat.

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