Metal working – Method of mechanical manufacture – Gear making
Reexamination Certificate
2000-10-03
2003-10-07
Echols, P. W. (Department: 3726)
Metal working
Method of mechanical manufacture
Gear making
C029S893200
Reexamination Certificate
active
06629369
ABSTRACT:
The invention relates to a process for the assembling of a gear unit, in particular one with the features from the generic term of claim 1.
Gear units are known in a large number of executions. These can be executed as
a) mechanical gear units
b) hydrodynamic-mechanical compound gear units.
Hydrodynamic-mechanical compound gear units are known, for example, from the following publications;
Buksch, M: ZF-five gear automatic gear systems for passenger automobiles, VDI report 878 (1991@
Nitescu, G.: Four-gear planetary gear for passenger motor vehicles with the hydrodynamic torque converter in the power branching, Automobilindustrie (1985) 5, pages 597-601
Klement, W.: The development of the DIWA gear system, Verkehr und Technik (1987) 7, pages 301-303
The gear construction units which have either only purely mechanical transmission components or else consist of a combination of a hydrodynamic converter or of a hydrodynamic coupling with a downstream mechanical gear set have as a rule a housing which is adapted, in respect to its inner contour, to the formation and tying of the individual gear elements onto the housing, and have, as a rule, inner insets which undesirably reduce the inside diameter. For example, one gear system obtainable on the market uses a threading on six rods or bars distributed at equal intervals about the circumference of the inner contour, with the aim of a very simple assembling of the components or gear elements. The individual rods ensure the gear elements against twisting in circumferential direction. The arrangement of the six bars, as viewed in circumferential direction of the gear unit, with constant spacing between two adjacent bars, as well as the number of these bars, however, considerably reduce the inside diameter of the gear since essentially the upper has in installation position reduce the construction height and therewith the possibly usable planetary diameter. The gear interior space, with respect to the present outside dimensions of the gear, cannot be used optimally for the gear elements. From the publication U.S. Pat. No. 3,475,992 there is known an execution of a compound gear component, in which individual elements, for example the pump execution, the input shaft, are preassembled outside of the gear housing and then installed from the left into the housing. The remaining gear components, such as distributor gear, bridging coupling, planetary wheel gear are then introduced individually into the housing from the right side of the housing. Some of the elements, such as braking elements, couplings, are borne there on guide elements, and these guide elements in correspondence to the introduction from the left or the right side are executed in several parts and corresponding partitions are borne between them. Also, the guide elements are supported on the end zones of the housing, i.e. on the housing cover. This means that with corresponding bearing of actuating elements axial forces are transferrable onto the housing cover, for which reason the gear component cannot be separately tested in advance without the housing cover.
Underlying the invention, therefore, is the problem of creating a process for the assembling of a gear component in which, besides a simple assembling, it is also ensured that with external prescribed installation dimensions there can be achieved as great as possible an inside diameter of the gear component. Further, emphasis is to be placed on a reduction of the constructive and manufacturing technical expenditure as well as on a minimizing of the requisite number of parts.
The solution of the problem according to the invention is characterized by the features of claim 1. Advantageous developments are described in the subclaims.
The gear component, which comprises a gear housing and a substantially cylindrical interior space, has at least two bar-form elements for the tying-on of gear elements either in radial direction or in circumferential direction. The bar-form guide elements extend there essentially over a range in which the gear elements provided for the typing-on are arranged. The bar-form guide elements are allocated to the cylindrical interior space and arranged in a zone outside of this, the allocation taking place in such manner that the bar-form guide elements are provided outside of a zone which, as viewed in installation position of the gear system, corresponds to the greatest dimension of the interior space of the gear unit, in height direction. According to the invention the individual gear elements are threaded successively from one housing side onto the guide elements and brought into their installation position in the gear housing.
Preferably none of the guide elements is arranged in installation position above the greatest dimensioning in height direction of the interior space in the gear housing, but in the formerly material-intensive zones of the gear housing with substantial quadrilateral gear exterior contour with cylindrical inner space.
With the solution according to the invention accordingly the inside diameter or the inside contour of the gear housing can be made appreciably larger with installation measurements that remain the same for the gear unit and (sc. the space needed for) the assembling, as well as the interchangeability of the individual gear elements in axial direction can be reduced. Through the guidance of the bar-form guide elements in the recesses that are connected with the cylindrical interior space the cylindrical inner space can be completely used by the gear elements in respect to their radial extent. For example with the execution of the gear elements as a lamellar coupling, the area describable by the cross section surface of the interior space can be used completely as a friction surface. Since the bar-form guide elements do not collide with the interior space, also the other rotating gear elements, for example planetary wheel sets, can be designed in such manner that the entire interior space is completely utilized in radial direction. This leads to the result that through the diameter increase with equal construction length a greater torque can be transmitted. It is possible to dispense with additional interior insets for the bearing, which reduce the diameter of the interior space. The suspension on the bar-form guide elements prevents twisting of the individual gear elements in circumferential direction.
Compulsorily required for the guidance are only two bar-form elements; there are required at most four and preferably four bar-form guide elements are used. The arrangement occurs in this case, as viewed in the cross section of the gear housing, in the comer zones, which (cross section) is describable by the section size between the cylindrical interior space and a theoretically generatable quadrilateral, preferably the quadrate Q
theoretic
with a side dimension greater or equal to the diameter of the interior space, the theoretically generatable quadrate Q
theoretic
and the interior space having identical axes of symmetry. In this case especially with a rectangular housing with cylindrical interior space the material-intensive comer zones are used for the reception of the guide elements. The guide elements there are conducted in recesses which are connected with the cylindrical interior space. Preferably, however, the arrangement of the guide elements always occurs symmetrically. This offers the advantage that the manufacturing expenditure for the gear elements and the gear housing can be minimized as can also the assembling expenditure, since it is not necessary to heed how the individual recesses or the passage openings on the gear elements must be formed for the reception of the guide elements. Also the housing base body with the recesses can be manufactured independently from the later actual installation position.
As gear elements there can be regarded, for example, braking arrangements in the form of lamellar brakes, partitions, actuating elements for braking or coupling arrangements, for example in the form of pistons, lamellae carriers or the lik
Körner Tillmann
Schieder Achim Paul
Baker & Daniels
Echols P. W.
Voith Turbo GmbH & Co. KG
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