Abstract
An automotive hinge assembly adapted to facilitate motion of a closure panel relative to a fixed body structure comprises a door component constructed from two press formed angle brackets structurally connected via a pivot pin and adapted to be mounted to a vehicle closure panel, a body component constructed from two press formed angle brackets structurally connected via a simple formed feature and the pivot pin and adapted to be mounted to a vehicle body structure, such that the pivot pin structurally assembles the two hinge components, facilitates relative rotary motion between them and structurally connects the multiple press formed angle brackets so that the resulting assembly achieves a much higher material efficiency than the prior art with an associated significant cost reduction.
Claims
1. An automotive hinge assembly comprising: a) a door component constructed from two press formed door angle brackets and adapted to be mounted to a vehicular closure panel; b) a body component constructed from two press formed body angle brackets, configured to accept a single pivot bushing and adapted to be mounted to a vehicular body structure; c) a pivot pin configured to structurally connect the press formed door and body angle brackets while holding the door component and body component in structural assembly and facilitating rotary motion between the door component and body component; d) the pivot pin being configured with a central cylindrical pivot surface with a central diameter adapted to allow rotation of the pivot bushing thereabout, and two knurled opposing cylindrical ends each with a diameter less than the central diameter adapted to structurally connect the door component angle brackets by material upset.
2. The automotive hinge assembly of claim 1, wherein the press formed body angle brackets are structurally joined via a semi-shear feature and matching alignment hole using press fitting, welding, bonding, riveting, staking or similar means of material upsetting.
3. The automotive hinge assembly of claim 1, wherein a pair of hinge stop formations are provided in the body angle brackets that are adapted to interact with a pair of hinge stop surfaces provided on the door angle brackets so that the hinge assembly is structurally restrained from rotation at its full open position.
4. The automotive hinge assembly of claim 1, wherein the pivot pin incorporates a tapered feature at a stepped interface between the central cylindrical pivot surface and two opposing cylindrical ends to compensate for thickness tolerances of the body component angle brackets during the assembly process.
5. The automotive hinge of claim 1, wherein the pivot pin is configured to structurally connect the press formed door angle brackets via a pivot bushing, washer and material upset while providing a cantilevered feature to facilitate simple separation and reassembly of the door and body components using a tapered nut and tapered pivot hole arrangement.
6. The automotive hinge of claim 5, wherein a rivet is adapted to provide the hinge stop on the body component while also structurally joining the press formed body angle brackets.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 is an exploded perspective view of a prior art press formed automotive door hinge assembly;
[0020] FIG. 2 is a plan view of a developed flat blank layout associated with the press form stamping of the components of the prior art automotive door hinge assembly of FIG. 1;
[0021] FIG. 3 is a perspective view of a pair of the inventive hinge assemblies in a typical automotive installation;
[0022] FIG. 4 is a perspective view of the inventive hinge assembly;
[0023] FIG. 5 is an exploded perspective view of the inventive hinge assembly;
[0024] FIG. 6 is a partial sectional view of the inventive hinge assembly through the centreline of the pivot pin;
[0025] FIG. 7 is a side view of the pivot pin of the inventive hinge assembly;
[0026] FIG. 8 is an exploded perspective view of the door component of the inventive hinge assembly;
[0027] FIG. 9 is an exploded perspective view of the body component of the inventive hinge assembly;
[0028] FIG. 10 is a plan view of a developed flat blank layout associated with the press form stamping of the components of the inventive hinge assembly;
[0029] FIG. 11 is a side view of an alternative tapered step embodiment of the pivot pin of the inventive hinge assembly;
[0030] FIG. 12 is a side view of an alternative fixed head embodiment of the pivot pin of the inventive hinge assembly;
[0031] FIG. 13 is a perspective view of an alternative lift-off embodiment of the inventive hinge assembly;
[0032] FIG. 14 is a partial sectional view of an alternative lift-off embodiment of the inventive hinge assembly through the centreline of the pivot pin.
DETAILED DESCRIPTION OF THE INVENTION
[0033] Referring to FIGS. 3, 4, 5, and 6, an automotive hinge assembly (30) is substantially constructed from a door component (40) and a body component (60). The door component is configured with a mounting surface (41) and two pivot arms (42). Each pivot arm (42) contains a pivot axis hole (43). The door component (40) is structurally attached to a vehicle closure panel (27) via its mounting surface (41) using bolting, welding, bonding, riveting or similar fastening means. The body component (60) is configured with a mounting surface (61) and a pivot arm (62). The pivot arm (62) contains a pivot axis hole (63). The body component is structurally attached to a vehicle body structure (28) via its mounting surface (61) using bolting, welding, bonding, riveting or similar fastening means. The pivot axis hole (63) of the body component (60) is fitted with a pivot bushing (80) that contains an internal cylindrical bearing surface (81) and two opposing thrust flanges (82). Referring to FIG. 7, a pivot pin (90) is configured with a central cylindrical pivot surface (91) and two knurled opposing cylindrical ends (92) each with a diameter less than the central cylindrical pivot surface diameter. The central cylindrical pivot surface (91) is adapted to freely rotate within the internal cylindrical bearing surface (81) of the pivot bushing and the two knurled opposing cylindrical ends (92) are adapted to be inserted and structurally connected to the door component (40) pivot axis holes (43) via riveting, staking or similar means of material upsetting. In this way the door component (40) and body component (60) are held in structural assembly but are free to rotate relatively to each other.
[0034] Referring to FIG. 8, the door component (40) is constructed from two press formed door angle brackets (46)(47) that are both configured with a mounting surface (41) and a pivot arm (42). The pivot arms (42) each contain a pivot axis hole (43). When the two knurled opposing cylindrical ends (92) of the pivot pin (90) are pressed into the pivot axis holes (43) and structurally attached via riveting, staking or similar means of material upsetting a single unitary door component (40) is created. The pivot pin (40) therefore replaces the structural bridge normally required to create a single, unitary door component significantly reducing the amount of material required and associated cost.
[0035] Referring to FIG. 9, the body component (60) is constructed from two press formed body angle brackets (66)(67) that are both configured with a mounting surface (61) and a pivot arm (62). The pivot arms (62) each contain a pivot axis hole (63). The two body angle brackets (66)(67) are configured so that the two pivot arms (62) are arranged surface to surface and aligned via a semi-shear mating feature (68) fitted within a matching alignment hole (69). When the semi-shear mating feature (68) is structurally connected within the alignment hole (69) via press fitting, welding, bonding, riveting; staking or similar means of material upsetting a single unitary body component (60) is created. The semi-shear mating feature (68) and alignment hole (69) are arranged so that the pivot axis holes (63) are in alignment. The pivot axis hole (63) is fitted with a pivot bushing (80) that contains an internal cylindrical bearing surface (81) and two opposing thrust flanges (82), only one of which is illustrated. In this way the two press formed body angle brackets (66)(67) create a single, unitary body component significantly reducing the amount of material required and associated cost in comparison to a single piece configuration.
[0036] FIG. 10 illustrates the flat blank layout of both the press formed body angle brackets (66a)(67a) and the press formed door angle brackets (46a)(47a) of the present invention as well as the scrap material (58) associated with the stamping process. In comparison with the flat blank layout of the prior art hinge assembly illustrated in FIG. 2 it is evident that the present invention offers superior overall material efficiency and lower scrap content than the prior art configuration.
[0037] In a preferred embodiment of the present invention a pair of hinge stop formations (70) are provided on the pivot arms (62) of the body angle brackets (66)(67) that are adapted to interact with a pair of hinge stop surfaces (50) provided on the pivot arms (42) or the door angle brackets (46)(47). When the door hinge assembly (30) is rotated to its full open position the hinge stop surfaces (50) contact the hinge stop formations (70) and prevent further rotation.
[0038] FIG. 11 illustrates an alternative embodiment of the pivot pin (100) of the present invention that incorporates two opposing cylindrical ends (102) that are configured without knurling. The pivot pin (100) is configured with tapered steps (105) between the larger diameter of the central cylindrical pivot surface (101) and the smaller diameters of two opposing cylindrical ends (102) that allow compensation for a range of body angle bracket material thickness. In the primary embodiment of the present invention the steps are configured to be square and without taper so that the door angle brackets (46)(47) are pressed on to the two knurled opposing cylindrical ends (92) to a fixed distance defined by the steps. Due to the material tolerances associated with the thickness of the two body angle brackets (66)(67) the two opposing thrust flanges (82) of the pivot bushing (80) can be under or over compressed resulting in inadequate structural assembly or poor relative rotational movement. The tapered steps (105) of the alternative embodiment allow the door angle brackets (46)(47) to be pressed onto the taper to a range of distances while allowing the riveting, staking or similar means of material upsetting to occur against a resistive base. The material interference between the two door angle brackets (46)(47) and the tapered steps (105) creates the structural connection between these components. Increased press loading allows the two door angle brackets (46)(47) to be set to a distance that properly compresses the two opposing thrust flanges (82) of the pivot bushing (80) so that adequate structural assembly and correct rotational movement can be achieved.
[0039] FIG. 12 illustrates an alternative embodiment of the pivot pin (110) of the present invention that is configured with a fixed head (116) to facilitate single sided riveting. The pivot pin (110) is configured with a central cylindrical pivot surface (111) and two knurled opposing cylindrical ends (112)(113). The knurled cylindrical end (112) adjacent to the fixed head (116) is of a larger diameter than the central cylindrical pivot surface (111) and the knurled cylindrical end (113) at the opposing end of the pivot pin (110) is of a smaller diameter than the central cylindrical pivot surface diameter. The fixed head (116) is of a larger diameter than the knurled cylindrical ends (112)(113) and the central cylindrical pivot surface (111). In this way the assembly process of the automotive hinge assembly (30) is simplified to a single pivot pin (110) insertion and riveting, staking or similar means of material upsetting of one end. A slight degradation of the structural attachment of the two door angle brackets (46)(47) may occur using this configuration.
[0040] FIGS. 13 and 14 illustrate an alternative embodiment of the present invention in that the pivot pin (190) is configured to facilitate ease of separation of the door component (140) and body component (160). This type of separation and reassembly is required in some vehicle assembly plants and is generally referred to as a lift-off process. Both the door component (140) and body component (160) are constructed in the same manner as the main embodiment of the present invention using two press formed door angle brackets (146)(147) and two press formed body angle brackets (166)(167). However, the pivot pin (190) is configured to be structurally connected to the two door angle brackets (146)(147) through a pivot bushing (180) and washer (184) via riveting, staking or similar means of material upsetting. The end of the pivot pin (190) opposite the washer and material upset is configured with a tapered feature (195) and threaded end (196) adapted to interface with a mating cylindrical pivot axis hole (163) in the body angle brackets (166). When the door component (140) is interleaved over the body component (160) a tapered nut (187) is provided that threads onto the threaded end (196) and interfaces with the mating cylindrical pivot axis hole (163) in the body angle bracket (167) achieving correct structural assembly between the door component (140) and body component (160) while the bushing arrangement assures adequate rotational movement. A stop rivet (170) is adapted to structurally connect the two body angle brackets (166)(167) while also interacting with a hinge stop surface (150) provided on the door angle brackets (146)(147) so that when the door hinge assembly (130) is rotated to its full open position the hinge stop surfaces (150) contact the hinge stop formations (170) and prevent further rotation.
