A method of optimizing a planetary gear system for continued operation after failure of a planet gear includes providing a planetary gear system and reducing a backup ratio of a planet gear of the planetary gear system by reducing a rim thickness of the planet gear.

In some embodiments, systems and methods are described for a gear contact system configured to support radial, thrust, and moment loads, the system comprising a first gear comprising a first roller having a first roller bearing surface, the first roller bearing surface having a convex curvature defined by a first radius of curvature; and a second gear comprising a second roller having a second roller bearing surface, the second roller bearing surface having a concave curvature defined by a second radius of curvature.

A computer-implemented system is disclosed for producing a design for a rotating machine assembly. It comprises a data module (10) configured for receiving data relating to one or more components of the rotating machine assembly; a user interface module (20 configured for specifying data to be received by the data module and for receiving from a user a type of analysis to be performed on the data; and an analysis module (30) configured for analysing a performance of the rotating machine assembly according to the type of analysis selected and selected features of the data to be used. It further includes a recognition module (40) configured for identifying and selected features of the data be used for the analysis according to the type of analysis selected. It provides an approach for managing and coordinating the data in the design of driveline systems so that the most accurate and informative insight on the driveline's performance is delivered to the engineer at the earliest possible point in the design process, hence product design and optimisation can be carried out as quickly and efficiently as possible. More aspects of product performance are coordinated together and the engineering insight is greater, hence the methodology becomes a platform for making engineering decisions rather than mathematical simulation.

The invention relates to a design method and a manufacturing method of a multi-linkage planetary gear speed changing mechanism and a gear speed changing mechanism, a planetary gear set is designed in a specific calculation mode in combination with different processing and assembling modes, by positioning and assembling the planetary gear set, the limitation of assembly condition of the multi-linkage planetary gear speed changing mechanism is broken through, and the assembled and manufactured multi-linkage planetary gear speed changing mechanism can obtain different speed ratios according to different transmission requirements, so that an application of the multi-linkage planetary gear speed changing mechanism is expanded.

The invention relates to a design method and a manufacturing method of a multi-linkage planetary gear speed changing mechanism and a gear speed changing mechanism, a planetary gear set is designed in a specific calculation mode in combination with different processing and assembling modes, by positioning and assembling the planetary gear set, the limitation of assembly condition of the multi-linkage planetary gear speed changing mechanism is broken through, and the assembled and manufactured multi-linkage planetary gear speed changing mechanism can obtain different speed ratios according to different transmission requirements, so that an application of the multi-linkage planetary gear speed changing mechanism is expanded.

A degree of freedom of a hypoid gear is improved. An instantaneous axis in a relative rotation of a gear axis and a pinion axis, a line of centers, an intersection between the instantaneous axis and the line of centers, and an inclination angle of the instantaneous axis with respect to the rotation axis of the gear are calculated based on a shaft angle, an offset, and a gear ratio of a hypoid gear. Based on these variables, base coordinate systems are determined, and the specifications are calculated using these coordinate systems. For the spiral angles, pitch cone angles, and reference circle radii of the gear and pinion, one of the values for the gear and the pinion is set and a design reference point is calculated. Based on the design reference point and a contact normal of the gear, specifications are calculated. The pitch cone angle of the gear or the pinion can be freely selected.

A method for designing a gearset meeting one or more design targets is described. In particular, the design target is efficiency. Initially, a size and ratio of the gear set is specified. Gear friction coefficients are then calculated, and a value for a design target for the gear set is calculated. One or more of the macro-geometry parameters are modified, and the macro-geometry parameters are chosen such that the advantageous effects of one macro-geometry parameter on the design target counteract any disadvantageous effects of another macro-geometry parameter. In this way, a design for a gearset meeting the one or more design targets is produced. The efficiency calculation includes the effect of a lubricant. Further design targets can include gear noise and gear durability.

A planet gear includes a pin and an annular planet gear rim. The pin has a pin radius. The pin includes a pin outer surface. The annular planet gear rim has an inner radius and an outer radius. The annular planet gear rim includes an inner surface and an outer surface. The inner surface and the pin outer surface define a clearance therebetween. The clearance is greater than 0 when a radial force is applied to the planet gear.

A method for designing a gear train having first and second enmeshed gears includes performing a first analysis with the first and second gears in a first configuration. The first analysis includes determining a first transmission error (TE) characteristic of the first configuration, and providing a first geometric representation of the first TE characteristic. The method also includes performing a second analysis with the first and second gears in a second configuration. The second analysis includes determining a second TE characteristic of the second configuration and providing a second geometric representation of the second TE characteristic. Moreover, the method includes providing a comparison of the first and second TE characteristics by providing a comparison of the first and second geometric representations.

An automatic transmission fluid (ATF) warmer coolant circulation system may include an ATF warmer connected to an engine oil cooler, in which engine coolant is circulated to the ATF warmer to preheat automatic transmission fluid of a transmission below an operation temperature of the ATF warmer.