Multi-stage spur gear transmission
First Claim
1. A multistage spur-type gearing for small-sized electric motors comprising in combination a gearing housing including an input shaft opening through which a motor shaft can be inserted into the interior of said housing for operating the spur-type gearing with the small electric motor, at least two gear shafts that are held in said gearing housing and extend at a distance from and in parallel with the center axis of said gearing housing, and spur gears of different diameters which are arranged on said gear shafts, at least one of said gear shafts being fixedly held as a gear axle in said gearing housing, and at least two spur gears being fixedly connected to one another and combined to form at least one dual gear set which is rotatably supported on a said gear shaft, said gear shaft (9, 11) being made from a sintered material in a sintering process and substantially containing a ceramic material, and said input shaft opening arranged to be substantially coaxial to the center axis (M) of said gearing housing (2, 3).
1 Assignment
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Accused Products
Abstract
A multistage spur-type gearing for small and miniature electric motors having a gearing housing and at least two gear shafts or axles held in the gearing housing, with spur gears of different diameters arranged on the gear shafts or axles. To achieve an extremely small construction at maximum reduction ratios in comparison with conventional spur-type gearings, at least two spur gears are fixedly connected to one another and combined to form a dual gear set, with the dual gear set rotatably supported on a gear axle made from a hard material, such as ceramics. At least one of the gear shafts should fixedly be held as a gear axle in the housing. An input shaft opening through which a motor shaft projects into the gearings is arranged to be substantially coaxial to the center axis of the gearing housing with which the gear shafts also extend in parallel and at some distance. Such a gearing makes it possible to arrange several reduction stages on one gear axle. Preferably, only two gear shafts or axles are used. Thus, in constructional terms, the present gearing is the smallest one among all conceivable variants of the gearing.
31 Citations
21 Claims
- 1. A multistage spur-type gearing for small-sized electric motors comprising in combination a gearing housing including an input shaft opening through which a motor shaft can be inserted into the interior of said housing for operating the spur-type gearing with the small electric motor, at least two gear shafts that are held in said gearing housing and extend at a distance from and in parallel with the center axis of said gearing housing, and spur gears of different diameters which are arranged on said gear shafts, at least one of said gear shafts being fixedly held as a gear axle in said gearing housing, and at least two spur gears being fixedly connected to one another and combined to form at least one dual gear set which is rotatably supported on a said gear shaft, said gear shaft (9, 11) being made from a sintered material in a sintering process and substantially containing a ceramic material, and said input shaft opening arranged to be substantially coaxial to the center axis (M) of said gearing housing (2, 3).
Specification