SU959215A1 - Portable electric machine with double insulation - Google Patents

Description

This invention relates to mechanical engineering, in particular, to the construction of double-insulated electric hand-held and portable machines, for example, tampers.

Electric machines with double insulation are those machines which, in addition to the main insulation, which ensures the operation of the machine and provides the operator with basic protection against electric shock, also have additional insulation that protects the operator in case of damage to the main insulation.

A known double-insulated, handheld electric machine containing an engine, the additional insulation of which is provided by an insulating sleeve on the shaft, and a seal in the form of annular projections and grooves that are mutually sortable with a certain gap is used to prevent the transfer from the gearbox to the engine.

The disadvantage of these seals is the laboriousness of the manufacture of individual parts, and the assembly on the rotating children and the fixed case.

Closest to the invention is a double-insulated non-portable electric machine, comprising a gearbox, including a housing and a gear, and an electric motor connected to the gearbox body, having a shaft shaft, a drive gear that meshes with the gear wheel and is connected to the shaft 10. p by means of an insulating material sleeve which fills the gap between the gear and the shaft of the cortex C 2).

The disadvantage of this design is that the protective disk, placed between the internal parts of the gearbox and the engine, does not provide reliable protection from the fall of the gear lubricant inside the 2Q engine. In addition, the protective disk is laborious to manufacture and install.

The purpose of the invention is to increase operational reliability by improving electrical safety.

The goal is achieved

Claims (2)

25 by the fact that the drive gear is made with radial holes communicating with the gap and filled with insulating material, and the sleeve has an integral profile flange with an end lug made at the same time, and the gearbox housing is made with a groove in which the end lug is located. The profile flange provides a reliable construction of the machine. As required, double insulation is required, since the leakage path from the gearbox to the engine is more fully blocked. Figure 1 shows the drive of an electric machine with double insulation, a longitudinal section; Fig. 2 shows a gear drive along radial holes, a cross section in Fig. 3 shows a variant of the design with a fan on the drive gear. The double insulated electric machine contains an electric motor case 1 with a protective casing 2. In case 1, a shaft 3 of a core rotates, it is connected with driving gear 4, and a sleeve 5 of insulating material fills the gap between connecting parts. The reducer b has a housing 7, adjoining the motor housing 1 in which there is a lubricant 8. The driving gear 4 has radial holes 9 communicating with a gap filled with insulating material of the sleeve 5, and the profile flange 10 with an end lug 11 is integral with with the sleeve, the end-face annular protrusion of the profile 10 fold 10 enters the ring groove 12 of the gear housing. The formation of a profile flange by an end ring protrusion during the formation of an insulating sleeve ensures low labor intensity and: the preparation of this part, simplifies assembly and eliminates the possibility of improper fit of the profile flange on the shaft. In another embodiment of FIG. 3B, the radio holes 9 in the drive gear 4 are shifted along the shaft axis to the end face adjacent to the gearbox in order to accommodate the fan 13 necessary for cooling the drive gear 4 of the insulated engine 3. Electric insulator with double insulation works as follows. The shaft 3 of the engine 1 through the drive gear 4 leads to the movement of the operating mechanism of a manual or portable electric machine. When the machine is in operation, it is provided double insulator of the operator from electric shock. Moreover, the additional insulation over the core is ensured by the fact that the shaft 3 and the drive gear 4 are interconnected by an insulating layer 5. The reliability of this additional insulation is increased due to more complete protection of the engine from lubricant from the gearbox, because The profile flange 10 is located on the end of the protrusion 11, which fits into the annular groove of the housing 12. In addition, the proposed design does not allow the replacement of the part by providing double insulation with any random part that increases the reliability of the electric bezgtasnoy work. The use of the proposed con-. Structures for driving hand-held and portable machines, for example in tampers, will provide an economic effect by increasing electrical safety, as the operator's labor productivity increases due to simplified maintenance and operation (there is no need for a DEP, a defrosting device and grounding, in addition, reliability Double Insulation. Formula of the Invention An electric portable machine with double insulation, containing a gearbox, including a body and a gear, and the accessions to the body motor, having a shaft core, a drive gear that meshes with the gear of the gearbox and is connected to the shaft of the shaft by means of a sleeve of insulating material that fills the gap between the gear and the shaft of the core, that, in order to increase operational reliability, the gear is made with radial holes communicating with said gap and filled with insulating material, and the sleeve is provided with a flange with an end protrusion and the gearbox housing is made with a groove in which p Aligned protrusion. Sources of information taken into account in e, expertise 1. Patent of Germany 1915713, cl. 21 d 47, 1974. 2. The patent of Germany 1110740, cl. 21 d 46, 1968.