CZ2006621A3 - Rotating electric apparatus and process for producing such electric apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a rotary electrical apparatus with a low rated voltage, typically less than 100 volts, for a mobile working machine with a housing (1), at least one current guiding element (2) introduced into a housing (1) for supplying and / or removing electrical energy, at least one cable (12) connectable to the current conducting element (2) and the housing (16) to protect the connection between the cable (12) and the current conducting element (2) from external influences, in particular moisture. The device (16) is formed as an elastic sleeve (16) with the first opening (17) and the second opening (18) for protecting the connection between the cable (12) and the current guiding element (2), the first opening (17) being closely guided to the cable (12) and the second opening (18) tightly surrounds the current conducting element (2). In the method of manufacturing the apparatus, the elastic sleeve (16) is formed with a first opening (17) and a second opening (18), wherein the first opening (17) is tightly guided on the cable (12) and the second opening (18) tightly surrounds the element (2). ) for conducting current. Firstly, an elastic sleeve (16) is pushed onto the cable (12), after which the cable (12) is connected to the current guiding element (2) and in the next step the elastic sleeve (16) is pushed onto the current guiding element (2) or onto a cylindrical body (4) surrounding the current conducting element (2).

Description

BACKGROUND OF THE INVENTION The present invention relates to a rotary electrical apparatus having a low rated voltage, preferably less than 100 volts, for a mobile machine with a housing, at least one current conducting element introduced into the housing for supplying and / or dissipating electricity. the current conductor and the device for protecting the connection between the cable and the current conducting element from external influences, in particular from moisture. The invention also relates to a method of manufacturing such a rotary electrical apparatus.

BACKGROUND OF THE INVENTION

Devices of this kind are used, for example, as drive motors in industrial trucks. Batteries with relatively low output voltages, typically between 12 and 100 volts, find use as a power source. Nevertheless, in order to deliver the required power in the range of several kilowatts, a high intensity current of up to several hundred amperes is therefore required. In order to transmit these current intensities, the current-carrying elements, which are usually designed as connecting cables, have a very large cross-sectional area.

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4 4 4 5 4 4

P 2 sizes at least 15 mm, but usually more than 30 mm. Because of their large cross-section, these cables are difficult to lay, can only bend over large arcs and require a lot of space. The routing of the cables into the housing of the electrical apparatus, where they are connected to the respective windings, is therefore particularly difficult.

In the prior art electrical apparatuses, the cables are routed either radially through the housing of the apparatus, where they are connected to the windings, or are connected in a terminal box arranged on the outside of the housing, either by means of elastic through elements which at the same time fulfill the sealing function against dirt and liquids. within which the conduit through the housing in the radial direction is realized by means of special electrically conductive bushings, which are insulated from each other and from the housing. These bushings are again connected to the windings inside the housing. Both variants require high production costs.

In addition, when routing cables, these cables must meet the requirements for use both inside and outside the motor, in particular temperature resistance and resistance to external influences such as chemicals, oils and moisture. In addition, the cables must be bent in curves with small radii, which is very laborious due to their large cross-sections.

When using a terminal box, the terminal box must be tightly closed, which requires additional work steps in addition to screwing the electrically conductive elements. In addition, the mounting volume of the electrical apparatus is noticeably increased with the terminal box, which presents considerable disadvantages when the mounting space in the industrial truck is limited.

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SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a rotary electrical apparatus having a low rated voltage, preferably less than 100 V, for a mobile machine with a housing, at least one current conducting element introduced into the housing for supplying and / or discharging electrical power. connectable to the current-carrying element and the device for protecting the connection between the cable and the current-carrying element from external influences, in particular from moisture, which is simple and which can be produced with minimal assembly costs.

This object is achieved according to the invention in that the device for protecting the connection between the cable and the current carrying element is designed as an elastic sleeve with a first opening and a second opening, the first opening being guided tightly on the cable and the second opening tightly surrounding the current carrying element. A single sleeve can be threaded onto the cable without problems and then, after the cable has been fixed to the current-carrying element, slid onto the element. The expensive and bulky terminal box can be omitted. In particular, laborious screwing of, for example, the lid or the terminal box housing can be dispensed with. The connection cables no longer have to be assembled in the terminal box, so that they can be routed anywhere in the motor housing.

It is expedient if the current-carrying element on the side located inside the motor is connectable to the cable. Thus, a simple connection of the current-carrying element to the winding cable can be provided inside the motor without an additional transmission element.

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It is particularly advantageous if the current guiding element on the side located inside the motor and / or outside the motor is designed as a threaded pin. Conventional cable lugs with annular lug can be attached to one threaded bolt and can be secured with a nut. The transmission of high currents is thus ensured by simple means.

In a further preferred embodiment of the invention, the current guiding element on the side located inside the motor and / or outside the motor is in the form of a threaded sleeve. Cables provided with a conventional ring lug with an annular loop can be fastened by means of a screw which is inserted through the annular loop and screwed into the thread. The transmission of high currents is thus ensured by simple means.

It is preferred that the current guiding element be oriented approximately radially with respect to the motor housing. This provides a compact and simple design.

It is particularly preferred that the through directions of the openings of the elastic sleeve are oriented approximately at right angles to each other. This provides a particularly simple and safe construction. The cable can be run parallel to the longitudinal axis of the motor so that a compact design is achieved. By disposing the openings at an angle to one another, the sheathing along the cable and / or the current guiding element is reliably prevented.

It is expedient if the current guiding element is surrounded by an approximately cylindrical body of electrically insulating material. This protects the current guiding element and facilitates the assembly of the elastic sleeve.

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It is particularly preferred that the approximately cylindrical body has at least one raceway. The elastic sleeve may be introduced into the groove by reinforcing at the second opening that closely surrounds the current guiding element so that the elastic sleeve is securely engaged and a good seal to the environment is ensured.

Furthermore, it is particularly advantageous if the current guiding element is arranged, preferably embedded, on a plate of electrically insulating material. The plate is simple to manufacture and can be easily inserted and sealed in a hole in the housing of the rotary electrical apparatus. A plurality of current guiding elements may be provided on the plate.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages and details of the invention will be explained in more detail below with reference to the embodiment shown in the drawing.

The figure shows a current guiding element 2 according to the invention for supplying and / or dissipating electrical energy introduced into the housing 1 of the rotary electrical apparatus.

DETAILED DESCRIPTION OF THE INVENTION

The current guiding element 2 is essentially designed as a threaded sleeve 2 and is attached to the connecting plate 3 of an electrically insulating material, preferably of plastic. For this purpose, a holding cylinder 4 is poured on the connecting plate 3 in the region of the threaded sleeve 2, which tightly surrounds and stabilizes

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• ¹ · ·· ·· second threaded sleeve gasket 5 also prevents the penetration of liquids or particles. The threaded sleeve 2 is secured against rotation by its shape, for example in that its outer contour is hexagonal, but in any case removes rotational symmetry about the central center axis A

The terminal plate 3 is fixed to the housing 1 of the rotary electrical apparatus by means of screws 6, the seal 7 preventing liquids and / or particles from entering the housing 1. Inside the rotary electrical apparatus, a cable 9 provided with a cable lug 8 is connected to the threaded sleeve 2 by means of a screw 10 and a lock washer 11, which is in electrical connection with the winding of the rotary electrical apparatus (not shown). This type of attachment allows the transmission of strong currents, since there is a sufficiently large cross-section to transfer current from the threaded sleeve 2 to the cable 9. On the side of the threaded sleeve 2 which lies outside the motor is also via a cable lug 13, screw 14 and lock washer 15 a connecting cable 12 is fastened to the threaded sleeve 2. The connection between the connecting cable 12 and the threaded sleeve 2 surrounds the elastic sleeve 16, the first opening 17 of which tightly surrounds the connecting cable 12 and whose second bore 18 also tightly surrounds the threaded sleeve 2. In addition, the holding roller 4 has a raceway 19 into which the elastic sleeve 16 engages with a bead 20 and is thus firmly secured there. The cylindrical shape of the holding cylinder 4 is particularly advantageous in that it allows the simple shaping of the elastic sleeve 16 as well as the simple threading of the elastic sleeve 16 onto the holding roller 4. In addition, the connecting cable 12 can be arranged in any rotational position with respect to the central axis A without changing components. Especially good sealing effects are achieved by the elastic sleeve 16, since it abuts both

89591a.rtf to the sides 21 of the holding cylinder 4, and by its bending 22 to the manifold plate 3.

The production of the rotary electrical device according to the invention is then carried out by first fastening one or more cables 9 to the terminal plate 3 with the threaded sleeves 2 already mounted, for example by means of encapsulated threaded sleeves 2. 1 motor. When mounting the connection cable 12, the elastic sleeve 16 is first slid onto the connection cable 12, with the cable lug 13 still lying loose. Then, the cable lug 13 is fastened to the threaded sleeve 2 by means of a screw 14 and then the elastic sleeve 16 is pulled over the holding cylinder 4 so that the bead 20 lies in its groove 19 over its entire circumference.

Of course, other embodiments of the invention are possible. For example, instead of a threaded sleeve 2, a pin can be provided as a current guiding element with an external thread on one or both sides, to which the cable lugs 8, 13 can be screwed by means of nuts. In such a case, a cylindrical body of insulating material which surrounds the pin may serve as the lower contact point for the cable lug 8, 13, but the offset region of the pin may also be possible.

Of course, the attachment of the cables 9, 12 can also be carried out by other prior art devices, such as clamping devices. The materials used are governed by the requirements of the particular case. For the elastic sleeve 16, for example, a rubber or a sufficiently elastic polymeric material is suitable.

The threaded sleeve 2 may be in the example shown

89591a.rtf is embedded in a mounting plate 3 or holding cylinder 4 formed thereon. However, other prior art fastening methods are possible which allow fastening which they are tight and secure against twisting, eg screwing or gluing.

Represented by:

Dr. Miloš Všetečka v.r.

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JUDr. Milos Všetečka advocate

120 00 Prague 2, Halkova 2

Claims (12)

PATENT CLAIMS Rotating electrical apparatus of low rated voltage, preferably less than 100 V, for a mobile working machine with a housing (1), at least one current-carrying element (2) introduced into the housing (1) for supplying and / or dissipating electric power , by at least one cable (12) connectable to the current conducting element (2) and to the device (16) for protecting the connection between the cable (12) and the current conducting element (2) from external influences, particularly moisture, characterized in that the device (16) for protecting the connection between the cable (12) and the current conducting element (2) is formed as an elastic housing (16) with a first opening (17) and a second opening (18), the first opening (17) being closely guided on the cable (12) and the second opening (18) closely surrounds the current guiding element (2). Rotary electrical apparatus according to claim 1, characterized in that the current guiding element (2) can be connected to the cable (9) on the side located inside the motor. Rotary electrical apparatus according to claim 1 or 2, characterized in that the current guiding element (2) is designed as a threaded pin on the side located inside the motor and / or outside the motor. Rotary electrical apparatus according to one of Claims 1 to 3, characterized in that the current guiding element (2) is designed as a threaded sleeve (2) on the side located inside the motor and / or outside the motor. 16 89591a.rtf Rotary electrical apparatus according to one of Claims 1 to 4, characterized in that the current guiding element (2) is oriented approximately radially with respect to the motor housing (1). Rotary device according to any one of claims 1 to 5, characterized in that the through directions of the openings (17, 18) of the elastic housing (16) are oriented approximately at right angles to each other. ARE VUC1 Rotary electrical apparatus according to any one of claims 1 to 6, characterized in that the current guiding element (2) is surrounded by an approximately cylindrical body (4) of electrically insulating material. Rotary electrical apparatus according to any one of claims 1 to 7, characterized in that the approximately cylindrical body (4) has at least one raceway (19). Rotary electrical apparatus according to one of Claims 1 to 8, characterized in that the current guiding element (2) is arranged, preferably cast, on a plate (3) of electrically insulating material. Rotary electrical apparatus according to any one of claims 1 to 9, characterized in that the current guiding element (2) is surrounded by a seal (5). A method of manufacturing a rotary electrical apparatus of low rated voltage, typically less than 100 V, for a mobile machine with a housing (1), at least one current-carrying element (2) introduced into the housing (1) for supplying 16 89591a.rtf and / or the dissipation of electrical power, by at least one cable (12) connectable to the current guiding element (2) and the elastic housing (16) to protect the connection between the cable (12) and the current guiding element (2) from external the elastic sleeve (16) being formed with a first opening (17) and a second opening (18), the first opening (17) being tightly guided on the cable (12) and the second opening (18) tightly surrounding the element (2) for conducting current, characterized in that the elastic sleeve (16) is first slid onto the cable (12), then the cable (12) is connected to the current-carrying element (2) and in the next step the elastic sleeve (16) ) onto a current guiding element (2) or onto a cylindrical body (4) surrounding the current guiding element (2).