MOTOR, PARTICULARLY FOR AN AUTOMOBILE WINDSCREEN WIPER MECHANISM

Abstract

The subject of the invention is a motor, specifically an automobile windscreen wiper mechanism, containing a casing (1,2) which defines an internal space, characterized in that the internal space of the motor is partially limited by a reversibly deforming element (5), preferably an elastic membrane (5), enabling the volume of the internal space to change under the influence of pressure exerted on the casing (1,2).

Claims

1. Motor, specifically for a vehicle windscreen wiper mechanism, containing a casing (1,2), which defines an internal space, characterized in that the motor's internal space is partially limited by a reversibly deforming element (5) enabling the volume of the internal space to be varied under the influence of pressure exerted on the casing (1,2).

2. Motor according to claim 1, characterized in that it contains a transmission casing (2) and a motor casing (1), where the reversibly deforming element (5) is located on the casing of the transmission (2) and/or on the motor casing (1) and/or between the motor casing (1) and the transmission casing (2).

3. Motor according to claim 1 or 2, characterized in that the reversibly deforming element (5) is made of a material that does not allow air through, preferably an elastomer.

4. Motor according to claim 1 or 2 or 3, characterized in that the reversibly deforming element (5) is an elastic membrane (5).

5. Motor according to claim 4, characterized in that it contains a blocking element (6) preventing ingestion of the elastic membrane (5) into the inside of the casing.

6. Motor according to claim 5, characterized in that the blocking element (6) is located on the casing of the transmission (2) and/or on the casing of the motor (1) and/or between the casing of the motor (1) and the casing of the transmission (2).

7. Motor according to any of the preceding claims, characterized in that it contains a rigid part of the casing and a reversibly deforming element (5), preferably an elastic membrane (5) which seals the internal space of the motor and enables the volume of the internal space to be increased by deformation of the reversibly deforming element (5) under the influence of pressure exerted on the casing by gas which is inside it.

8. Motor according to claim 7, characterized in that it contains a blocking element (6) in the form of a tongue (6) fastened to the inside surface of the rigid part of the casing and at least partially located in the inside diameter of the opening in the rigid part of the casing, which is covered by the reversibly deforming element (5) in the form of an elastic membrane (5).

9. Motor according to claim 8, characterized in that in the part which is located in the inside diameter the blocking element (6) possesses openings (7).

10. Windscreen wiper motor according to claim 7 or 8 or 9, characterized in that the reversibly deforming element (5) is an elastic membrane (5) fastened to the cover and/or to the bottom element of the rigid part of the casing of the transmission (2).

11. Motor according to claim 7 or 8 or 9, characterized in that the reversibly deforming element (5) is an elastic membrane (5) fastened inside the rigid part of the casing and attached to the inner surface of the rigid part of the casing and/or to the walls forming the equalizing tank (9) around the opening (8) in the rigid part of the casing, attached to or forming part of the internal surface of the rigid casing.

12. Windscreen wiper motor according to claim 7 or 8 or 9, characterized in that the reversibly deforming element (5) forms a cover for the rigid part of the casing of the transmission (2).

Description

[0020] The invention will now be presented in more detail in favourable examples of its manufacture, with reference to the appended figures, where:

[0021] FIG. 1 shows an electric motor with a transmission system of a prior art system,

[0022] FIG. 2 shows a motor with a casing containing an elastic membrane,

[0023] FIG. 3 shows a motor with an elastic membrane at the moment of a pressure jump,

[0024] FIGS. 4-7 show different variants of location of the elastic membrane on the motor casing and on the transmission casing,

[0025] FIGS. 8-10 show different variants of fastening the elastic membrane to the casing,

[0026] FIGS. 11-12 show the blocking element preventing ingestion of the elastic membrane into the inside of the casing,

[0027] FIG. 13 shows a motor with membrane fastened inside the casing,

[0028] FIG. 14 shows a membrane in the equalizing tank, the walls of the tank being attached to the rigid part of the casing,

[0029] FIG. 15 shows a membrane in an equalizing tank created by the wall and the rigid part of the casing.

[0030] FIG. 1 shows an electric motor with a transmission system of a prior art system.

[0031] FIG. 2 shows a motor for an automobile windscreen wiper mechanism with a transmission cover (2) containing a rigid part and an elastic membrane (5) fastened on the lid of the box casing. During operation the motor heats the air inside the sealed casing system the motor casing and the transmission casing. The air pressure increases and, acting on the casing and the reversibly deforming element (5), causes it to deform, with a resultant enlargement in the volume of gas and a reduction in pressure (FIG. 3). When the motor is switched off and has cooled, the membrane returns to its initial position (FIG. 2).

[0032] FIG. 4 illustrates an example of a version in which two elastic membranes (5) are fastened to the bottom element of the rigid part of the transmission casing (2). This membrane location is favourable in view of the packaging, i.e. membrane operation in this area does not entail a need to design a greater amount of space for the transmission and motor system.

[0033] FIG. 5 and FIG. 6 illustrate sample variants of a motor in which both the transmission casing (2) and the motor casing (1) contain an elastic membrane.

[0034] FIG. 7 illustrates a motor in which the seal between transmission casing (2) and motor casing (1) is an elastic membrane (5).

[0035] FIGS. 8-10 show different variants of fastening of membrane to casing. The membrane may be fastened to the inside (FIG. 8), the outside (FIG. 9) or to both (FIG. 10) surfaces of the rigid part of the transmission casing (2) or the motor casing (1).

[0036] FIG. 11 shows a blocking element (6) preventing ingestion of the elastic membrane (5) into the inside of the casing, in the form of a tongue (6) fastened to the internal surface of the rigid part (1,2) of the casing and partially located in the inside diameter of the opening, which covers the elastic membrane (5). The blocking element (6) may preferably possess openings (7), as illustrated in FIG. 12, facilitating the flow of air in the space between the interior of the casing and the membrane.

[0037] The membrane may also be fastened inside the casing of the transmission (2) and/or the motor (1) (FIGS. 13-15). The membrane may be attached to the inside surface of the rigid part of the casing. Around the opening in the casing (8) an equalizing tank may also be created (9). The walls of the equalizing tank may be attached to the inside surface of the rigid part of the casing (FIG. 14) or may be a part of the casing (FIG. 15). An elastic membrane (5) is fastened to the walls of the equalizing tank (9). As a result of this, movement of the membrane (5) is restricted to a previously set space.

[0038] In another, non-illustrated example, the reversibly deforming element (5) is not a membrane, but a rigid element, which may take at least two positionsconcave (in the direction of the internal space of the motor) and convex, like the caps for jars of the twist-off click type, fitted with an element used to check whether the jar, and especially one containing food products, has been opened (known as a safety button in English). Such an element may be located on the transmission casing (2) or the motor casing (1), or constitute a tongue on the rigid part of the transmission box casing (2).

[0039] The examples shown do not narrow the scope of the required protection down only to motors for an automobile windscreen wiper mechanism. Motors as in the invention may find application in any place where it is best to protect a motor from moisture.