Machine element or mechanism – Elements – Gear casings
Reexamination Certificate
2000-08-16
2002-08-20
Luong, Vinh T. (Department: 3682)
Machine element or mechanism
Elements
Gear casings
C074S372000, C074S371000
Reexamination Certificate
active
06435057
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a gear constructional unit in particular with an essentially cylindrical interior space and bar form guide elements for mounting gear elements.
2. Description of the Related Art
Gear constructional units are known in a large number of executions. These can be executed as
a) a mechanical gear component
b) a hydrodynamic-mechanical compound gear component.
Hydrodynamic-mechanical compound gear components are known, for example, from the following publications:
Buksch, M: ZF five-gear automatic gears for passenger cars, VDI report 878 (1991)
Mitescko, G: Four-gear planetary gears for passenger cars with the hydrodynamic torque converter in the power branch, Automobilindustrie (1995) 5, pages 597-602
Klement, W.: The development of the DIWA gears, Verkehr und Technik (1997) 7, pages 301-303
Gear components 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 in respect to its inner contour is adapted to the shape of the individual gear elements and to their connection to the housing and they have, as a rule, interior insets which undesirably reduce the inside diameter. For example, one known gear uses a threading of the gear elements onto six rods which are allocated to the interior space of the gear circumferentially at uniform intervals. This makes possible, to be sure, a very simple assembling of the components or gear elements, but the arrangement of the six bars in circumferential direction with constant spacing between two bars, as well as the number of these rods considerably reduces the inside diameter of the gear system, since the upper bars in installation position determine the structural height and therewith also the possible usable planetary diameter.
Underlying the invention, therefore, is the problem of creating a possibility for the formation of gear components, especially gear housings, with which in firmly prescribed installation as high as possible torques can be transmitted. In detail, there, emphasis is to be given to a reduction of the constructive and above all of the manufacturing technical expenditure as well as a minimizing of the required number of components.
BRIEF SUMMARY OF THE INVENTION
According to the invention the gear component, which comprises a gear housing and has a substantially cylindrical interior space, has at least two bar-form elements for the tying-on of gear elements in radial direction with respect to the gear axis, or in peripheral direction. The bar-form guide elements extend there essentially over a range in which there are arranged the gear elements provided for the tying-on. The bar-form guide elements are assigned to the cylindrical interior space and are arranged outside of this, in which the allocation occurs in such manner that the bar-form guide elements are provided outside of a zone which, as viewed in installation position of the gear, corresponds to the greatest dimension of the interior space in elevation direction of the gear component.
This means that none of the guide elements is arranged in installation position above the greatest dimension of the interior space in elevation direction, in the gear housing, but rather they are in the zones formerly more intensive in material for the gear housing, with an essentially quadrangular gear external contour with cylindrical interior space.
Under a further aspect of the invention there occurs there an arrangement of the bar-form guide elements with respect to the cylindrical interior space in a zone which is bounded by the installation position
Under a further aspect of the invention there occurs there an arrangement of the bar-form guide elements with respect to the cylindrical interior space in a zone which is bounded by the minimal and maximal dimensions of the cylindrical interior space. This means that there does not occur an arrangement directly above the greatest dimension in elevation direction, or underneath the lowest dimension of the cylindrical interior space in elevation direction, on the symmetry line of the cylindrical interior space running in elevation direction, as viewed in installation position. This offers the advantage that the housing builds relatively in elevation direction and therefore does justice optimally to the increasingly raised demands on the utilization of the available construction space.
With the solution according to the invention, therefore, the inside diameter or the inside contour of the gear housing can be made noticeably greater with constant installation measures for the gear component. By the guidance of the bar-form guide elements in the recesses which are connected with the cylindrical interior space, the cylindrical interior space can be utilized completely by the gear elements in respect to their radial extent. For example, with execution of the gear elements as a lamellar coupling the surface describable by the cross section surface of the interior space can serve more completely as possibly usable friction surface. Since the bar-form guide elements do not collide with the interior space, the other rotating gear elements, for example planetary wheel sets, can also be laid out in such manner that the entire interior space is completely utilized in radial direction. This leads to the result that because of the diameter increase with the same construction length, a greater torque can be transferred. 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 a twisting of the individual gear elements in circumferential direction and, in addition, limits the movability in radial direction with respect to the gear axis.
Compulsorily required are only two bar-form elements; at most four are required and preferably four bar-form guide elements are set in. The arrangement occurs in this case, as viewed in the cross section of the gear housing, in the corners zones, which (cross section) is describable by the section amount between the cylindrical interior space and a theoretically generatable square Q
theoretical
with a side dimension greater than or equal to the diameter of the interior space, the theoretically generatable square Q
theoretical
and the interior space having identical axes of symmetry. In this case, especially with a rectangular housing with cylindrical interior space, the material-intensive corner zones are used for the reception of the guide elements. The guide elements are guided there in recesses that are connected with the cylindrical interior space. Preferably the arrangement of the guide elements, however, occurs always symmetrically. This offers the advantage that the production expenditure for the gear elements and the gear housing can be minimize, as can also the assembling expenditure, since it is not necessary to take care of how the individual recesses or the passage openings on the gear elements have to be formed for the reception of the guide elements. Furthermore, the hosing base body can be made with the recesses independently of the latter actual installation position.
As gear elements there can be regarded, for example, brake arrangements in the form of lamellar brakes, partitions, actuating elements for braking or coupling devices, for example in the form of cylinders, pistons or cylinder-piston units, lamellae carriers or the like.
The bar-form elements preferably have over their axial extent, a like or constant diameter. This offers the advantage that the assembling can take place independently from the installation direction of the bar-form elements. There is conceivable also, depending on the formation of the total gear component, the use of bar-form elements with different diameter over the axial extent. In this case, however, as a rule, an assembling will occur as a rule from two sides.
By bar-form elements there are meant t
Korner Tillmann
Schieder Achim Paul
Baker & Daniels
Luong Vinh T.
Voith Turbo GmbH & Co. KG
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