KR20140020279A - Resilient sliding contact and method for the production thereof - Google Patents

Abstract

The present invention is a sliding contact portion 4, 14 comprising at least one main body (2, 12), the sliding contact member (1, 11) is disposed on one end of the main body (2, 12), the sliding contact member (1, 11) relates to sliding contacts 4, 14 which are wires, wire fragments or metal balls. According to the invention, the at least one body 2, 12 is made of substantially stainless steel, and in at least some areas a welded auxiliary layer connecting the bodies 2, 12 to the sliding contact members 1, 11 ( 3, 13 are disposed between the bodies 2, 12 and the sliding contact members 1, 11 in at least some areas, and the welded auxiliary layers 3, 13 are coatings of the bodies 2, 12.

Description

Elastic sliding contact part and its manufacturing method {RESILIENT SLIDING CONTACT AND METHOD FOR THE PRODUCTION THEREOF}

The present invention relates to a sliding contact including at least one main body, wherein the sliding contact is disposed on one end of the main body.

The invention also relates to potentiometric sensors, potentiometers, sliding dolly regulators, position sensors, rotary switches, electric motors, generators, wind turbines, slip ring systems, actuators or current collectors with these types of sliding contacts. A method for manufacturing a sliding contact of

Sliding contacts have a wide variety of applications in which electrical current and / or signals are intended to be delivered to moving parts. Sliding contacts of this type are known, for example, from DE 40 20 700 A1. DE 199 13 246 A1 discloses a wiper slider for the transmission of an electrical signal, which is designed as a multi-wire wiper contact. The purpose of many contacts is to ensure that electrical contact is provided from beginning to end.

Sliding contacts made from strips of metal and with contacts on their ends are known from US 5,315,758 A and US 5,416,969 A. Sliding contacts of this type are used, for example, with metallic counter-contacts in potentiometers, position sensors or rotary switches.

DE 20 2004 019 679 U1 and DE 103 59 896 A1 disclose a carbon brush for electric current transfer, in which a layer of carbon is connected to a layer of metal, for example pressed against it.

A general sliding contact with a body made of wire, in which the sliding contact is arranged on one end of the wire, is known from DE 10 2004 028 838 A1. By this means, it is possible to select an inexpensive elastic material for the body of the contact, while the energy-transmitting portion can be composed of other materials that are optimized for energy transfer as sliding contacts. In such contacts, the sliding contacts may be composed of precious metals or precious metal alloys. In this connection it is advantageous that expensive precious metals can be saved because not all spring contacts need to be made of precious metals or precious metal alloys.

Copper-beryllium alloys, which are widely used because of their high conductivity and good elastic properties, are preferred support materials for this purpose. In addition, sliding contacts made of a noble metal or a noble metal-containing alloy can be well connected to the Cu-Be support by welding.

In this respect, it is disadvantageous that welding the sliding contact to the support material may adversely affect the elastic properties of the support or the wire, which determines the elastic properties of the sliding contact. However, due to its harmful environmental effects, beryllium alloys such as beryllium and CuBe ₂ are increasingly being avoided. In addition, the connection between the elastic wire and the sliding contact can deteriorate over time due to different materials and poor connection properties.

Therefore, it is an object of the present invention to overcome the disadvantages of the prior art. In particular, the present invention seeks to provide a stable sliding contact which, if possible, contains no material with harmful environmental influences and which has the desired elastic properties and at the same time provides a reliable sliding contact surface.

It is an object of the present invention that the sliding contacts 1, 11 are balls made of a wire, a piece of wire or a metal, at least one body consisting essentially of stainless steel and a welded auxiliary layer at least in that area. Disposed between the body and the sliding contacts over, connecting the body to the sliding contacts over at least the area, and the welded auxiliary layers 3, 13 are satisfied in that they are a coating of the bodies 2, 12.

Having a welded auxiliary layer ensures that the stainless steel of the body can be connected in a stable manner to sliding contacts that cannot be welded in the same stable manner to stainless steel, which is composed of different materials. By this means, the material of the sliding contact can be freely selected because the welded auxiliary layer forms a stable connection to both the stainless steel and the material of the sliding contact as the intermediate layer. In this regard, according to the present invention, the sliding contact may comprise a noble metal or a noble metal alloy.

The invention may also provide that the welded auxiliary layer connects the body to the sliding contact by a welding process over at least that area.

The present invention can provide that the main body is an elastic wire having a round, oval or angular cross section, preferably an elastic stainless steel wire or an elastic stainless steel spring.

The wire is easy to get If the wire has a round cross section, the wire has a symmetrical elasticity such that the counter-contacting portion may also not be flat.

In this regard, the present invention relates to alloys wherein the metal of the sliding contact comprises copper, nickel and / or precious metals, or precious metals, preferably at least one precious metal, particularly preferably gold, platinum, palladium, silver or It can provide what consists of this alloy.

The metal achieves particularly good contact. The surface of the metal is not easily oxidized so that good conductivity can be ensured at the transition of the sliding contact to the counter-contact.

The invention also provides that the sliding contact is a gold base alloy or a palladium-based alloy, preferably 35 to 44 weight percent palladium, 30 to 38 weight percent silver, 14 to 16 weight percent copper, and platinum, gold and It may be provided that consist of an alloy containing up to 3% by weight of additives comprising zinc.

The alloy is particularly suitable for forming good sliding contact surfaces and can also be well connected to the welded auxiliary layer according to the invention.

Another embodiment of the invention is that the welded auxiliary layer is metallic, preferably comprises gold, palladium, nickel and / or copper, particularly preferably composed of gold, palladium, nickel, copper and / or alloys thereof Can be provided.

The metal can be used to create a particularly stable connection of the sliding contact and the body. The exact composition in this regard depends on the choice of metal and / or material for the sliding contact. In this connection, nickel, copper or alloys thereof are particularly suitable as welded auxiliary layers which, even if the stainless steel surface is slightly oxidized, can still produce a good connection to the stainless steel during welding.

In addition, the present invention can provide that the welded auxiliary layer is preferably a coating of the body, which is applied to the body by roll cladding, sputtering or electroplating.

Having a coating allows the body to not need to be heated strongly while at the same time connecting it to the sliding contact. Heating stainless steel is problematic because it can be annealed to relax its elastic properties, which are important for sliding contacts.

The invention may also provide that the sliding contact is welded to the body by means of a welded auxiliary layer, preferably by resistance welding, spot welding and / or laser welding.

According to another embodiment, the present invention may provide that the body extends in the longitudinal direction and has a thickness of 50 μm to 500 μm and / or the sliding contact has a thickness of 50 μm to 500 μm.

The sliding contact according to the invention can also be characterized in that the welded auxiliary layer has a thickness of 0.05 μm to 10 μm.

A particularly preferred embodiment of the invention may provide that the sliding contacts are multi-wire wiper contacts with a plurality of bodies having an auxiliary layer welded in electrical contact with each other and having sliding contacts disposed thereon. Can be.

Multi-wire contacts are particularly suitable because they allow failure of individual contact sites and can be adapted to the profile of the counter-contact.

The present invention can also provide a counter-contact, wherein the sliding contact contacts the conductive surface, the sliding contact is pressed on the conductive surface of the counter-contact by the spring force of the elastic body, and the counter-contact is counteracted. The sliding contact is movable relative to the sliding contact to wipe the counter-contacting portion when the contact moves.

In this regard, the present invention provides that the counter-contacting part is rotatably supported, such as in a bearing, the surface being rotationally symmetrical, or the surface being flat, and moving on the surface of the counter-contacting part in such a way that the sliding contact is pushed or pulled. It can provide what is possible.

The object of the invention is also met by a potentiometer sensor, potentiometer, slip dolly regulator, position sensor, rotary switch, electric motor, generator, wind turbine, slip ring system, actuator or current collector with a sliding contact of this type.

In this type of component, the contact parts according to the invention can be used particularly effectively.

And finally, the object of the invention is also a method for producing a sliding contact spring of this type, in which the body is coated with a welded auxiliary layer, preferably applied to the body via rolling cladding, sputtering or electroplating, The sliding contact is met by means of a welded auxiliary layer, preferably by means of resistance welding, spot welding and / or laser welding to the body.

The present invention is surprisingly based on the finding that the welded auxiliary layer makes it possible to select those materials without having to pay attention to whether the materials suitable for each of the body and the sliding contact need to be welded together well. In addition, a more stable connection is achieved compared to a connection without welded auxiliary layers. In addition, it is easy to weld the sliding contact onto the body material in the presence of the welded auxiliary layer, for example, when a welded auxiliary layer with a lower melting point is used, it allows lower temperatures to be used. . For example, particularly low melting point alloys (eg eutectic alloys) can be used as the material for the welded auxiliary layer.

The method according to the invention is used to produce a sliding contact having this advantage. In this regard, it is particularly advantageous to first apply a welded auxiliary layer to the body, then to place the sliding contact on the welded auxiliary layer on the body and finally to connect the welded auxiliary layer to the body. Preferably, the connection is created by welding.

The welded auxiliary layer differs in two ways to form a sliding contact so that the elastic properties of the stainless steel and the contacting properties of the sliding contacts, in particular of the sliding contacts formed of precious metals, can be combined without the electrical or mechanical load bearing capability of the sliding contacts. Enable the connection of materials.

Exemplary embodiments of the present invention are described below based on three figures showing a schematic drawing without limiting the invention.

According to the present invention, a stable sliding contact is provided which, if possible, contains no material having harmful environmental influences and which has the desired elastic properties and at the same time provides a reliable sliding contact surface.

1 shows a schematic view of a configuration for producing a sliding contact according to the invention.
2 shows a schematic view of a sliding contact according to the invention.
3 shows a schematic view of an alternative sliding contact according to the invention.

1 shows a schematic cross sectional or side view of a configuration for producing a sliding contact according to the invention. The sliding contact 1 and / or the wiper wire 1 are provided to be fixed to the main body 2 in the form of an elongated stainless steel spring having a rectangular cross section in which a welded auxiliary layer 3 is disposed thereon.

The body 2 is made of chrome-nickel stainless steel with elastic properties as suitable for spring contacts. The sliding contact 1 is preferably a gold-based alloy, preferably containing 35 to 44% by weight of palladium, 33 to 38% by weight of silver, 14 to 16% by weight of copper, and platinum, gold and zinc. It consists of a palladium-based alloy containing up to 3% by weight of additives. Preferably, nickel can be used as the welded auxiliary layer 3 because nickel can be well connected to Cr-Ni stainless steel or well connected to the sliding contact 1. In the boundary region, the welded auxiliary layer 3 is fused to the body 2 and the sliding contact 1. Thus, the welded auxiliary layer is not solder in the true sense of the term.

The welded auxiliary layer 3 is applied on the jacket surface of the body 2 at the side. For easier handling, it may be convenient to coat the entire surface of the body 2 with a welded auxiliary layer 3.

1, the welded auxiliary layer 3 is provided only on one side of the body 2. If instead FIG. 3 is considered a cross sectional view, the welded auxiliary layer 3 may also extend to the lateral surface of the body 2, which is located in the image plane. For ease of handling of the coated body 2, it may be advantageous that it is coated with the auxiliary layer 3 welded on all sides.

FIG. 2 shows a schematic sectional or side view of the assembled sliding contact 4 composed of the sliding contact 1 according to FIG. 1 and the body 3 coated with a welded auxiliary layer 3. For this purpose, a sliding contact 1 is arranged on the welded auxiliary layer 3 of the body 2. Subsequently, the sliding contact 1 is welded to the main body 2 at at least one point by two electrodes (not shown) contacting the upper surface of the sliding contact 1 and the bottom surface of the main body 2. In this connection, the welded auxiliary layer 3, already firmly connected to the body 2, is partially melted and connected to the sliding contact 1. Alternatively, different welding methods can be used to connect the sliding contact 1 to the body 2.

The finished sliding contact 4 can then be used as a collector and / or transmitter of current and / or electrical signals from and / or to a counter-contact (not shown). For this purpose, the sliding contact 4 is pressed on the counter-contacting part via the spring force of the body 2. Thus, the sliding contact 4 can be used for potentiometer sensors, potentiometers, slip dolly regulators, position sensors, rotary switches, electric motors, generators, wind turbines, slip ring systems, actuators, current collectors and other devices.

3 shows a schematic cross sectional or side view of an alternate sliding contact 14. The sliding contact 14 comprises a ball-shaped sliding contact 11, a body 12, and a welded auxiliary layer 13. The welded auxiliary layer 13 is disposed on the front surface of the main body 12 (right side of the main body 12 in FIG. 3), and connects the sliding contact 11 to the main body 12. The diameter of the sliding contact 11 is larger than the diameter of the body 12 so that it can be pressed on the surface of the counter-contacting portion (not shown) which is oriented parallel to the body 12. In order to take advantage of the elastic properties of the body 12, the surface of the counter-contacting portion is not oriented perpendicular to the body 12, preferably the tangent of the axis of symmetry of the cylindrical body 12 and the curved surface of the counter-contacting portion. Or at an angle of 0 ° to 80 ° between the flat surfaces. For example, in the case of a cylindrical counter-contact that is supported as in a bearing so that it can be rotated relative to the sliding contact 14, a curved counter-contact surface is formed, wherein the cylinder jacket surface of the counter-contact is formed. Is the surface on which the sliding contact 11 wipes during the rotation of the counter-contact.

The features of the invention disclosed in the preceding description and the claims, the drawings, and the exemplary embodiments may be essential to the implementation of various embodiments of the invention, alone or in any combination thereof.

1, 11: sliding contact / wiper wire
2, 12: main body / stainless steel spring
3. 13: welded auxiliary layer
4, 14: sliding contact

Claims (14)

As the sliding contact parts 4 and 14 including at least one main body 2 and 12, the sliding contacts 1 and 11 are disposed on one end of the main body 2 and 12, and the sliding contact 1, 11), in the sliding contact portions 4 and 14, which are a wire, a piece of wire or a ball made of metal,
At least one body 2, 12 consists essentially of stainless steel, with welded auxiliary layers 3, 13 between the body 2, 12 and the sliding contacts 1, 11 at least over the area. Arranged, connecting the bodies 2, 12 to the sliding contacts 1, 11 over at least the area, wherein the welded auxiliary layers 3, 13 are a coating of the bodies 2, 12. Sliding contact (4, 14). The method of claim 1,
The main body 2, 12 is a resilient wire having a round, oval or angular cross section, preferably a sliding contact 4, 14, which is an elastic stainless steel wire or an elastic stainless steel spring. 3. The method according to claim 1 or 2,
The metals of the sliding contacts 1, 11 comprise copper, nickel and / or precious metals, or alloys containing precious metals, preferably at least one precious metal, particularly preferably gold, platinum, palladium, silver or alloys thereof Sliding contact portion (4, 14), characterized in that consisting of. 11. A method according to any one of the preceding claims,
The sliding contacts 1, 11 comprise a gold-based alloy or a palladium-based alloy, preferably 35-44 wt% palladium, 30-38 wt% silver, 14-16 wt% copper, and platinum, gold and zinc. A sliding contact (4, 14), characterized in that it consists of an alloy containing up to 3% by weight of an additive. 11. A method according to any one of the preceding claims,
The welded auxiliary layers 3, 13 are metallic, preferably comprising gold, palladium, nickel and / or copper, and particularly preferably composed of gold, palladium, nickel, copper and / or alloys thereof. Sliding contact portions 4 and 14. 11. A method according to any one of the preceding claims,
The welded contact layers 4, 14 are characterized in that the welded auxiliary layers 3, 13 are applied to the bodies 2, 12 by rolling cladding, sputtering or electroplating. 11. A method according to any one of the preceding claims,
The sliding contact 1, 11 is characterized in that it is welded to the bodies 2, 12 by means of the welded auxiliary layers 3, 13, preferably by resistance welding, spot welding and / or laser welding. Contacts 4, 14. 11. A method according to any one of the preceding claims,
The main body 2, 12 extends in the longitudinal direction and has a thickness of 50 μm to 500 μm, and / or the sliding contact 1, 11 has a thickness of 50 μm to 500 μm, and the sliding contact 4, 14). 11. A method according to any one of the preceding claims,
The sliding contact (4, 14), characterized in that the welded auxiliary layer has a thickness of 0.05 [mu] m to 10 [mu] m. 11. A method according to any one of the preceding claims,
The sliding contacts 4, 14 have a plurality of bodies 2, 12 with sliding contacts 1, 11 with the auxiliary layers 3, 13 in electrical contact with and welded thereon and disposed thereon. Sliding contact (4, 14), characterized in that it is a multi-wire wiper contact. 11. A method according to any one of the preceding claims,
A counter-contact is provided, the sliding contacts 1 and 11 contact the conductive surface, and the sliding contacts 1 and 11 are contacted by the spring force of the elastic bodies 2 and 12 to the conductive surface of the counter-contact. A sliding contact, characterized in that the sliding contact (1, 11) is movable relative to the sliding contact (1, 11) so that the sliding contact (1, 11) wipes the relative-contacting portion when the relative-contacting portion moves. 4, 14). 12. The method of claim 11,
The counter-contacting part is rotatably supported as in a bearing, the surface is rotationally symmetrical, or the surface is flat, and the sliding contact is movable on the surface of the counter-contacting part in a pushing or pulling manner. Contacts 4, 14. Potentiometer, potentiometer, sliding dolly regulator, position sensor, rotary switch, electric motor, generator, wind turbine, slip ring system, actuator or current collector with sliding contacts 4, 14 according to any of the preceding claims. . A method for producing a sliding contact according to any one of claims 1 to 13,
The body is coated with a welded auxiliary layer and is preferably applied to the body via rolling cladding, sputtering or electroplating, and the sliding contact is welded by the welded auxiliary layer, preferably resistance welding, spot welding and / or laser A sliding contact manufacturing method, characterized in that welded to the body by welding.

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