CONTACT PIN, CARRIER PLATE AND ELECTRICAL MACHINE

Description

[0001] The invention relates to a contact pin for an electrical machine, in which at least a first component longitudinal section and a second component longitudinal section are provided.

[0002] Particularly in automotive electronics, it is often necessary to integrate devices with control electronics into an engine, transmission, etc., in order to maximize the use of limited installation space and keep cable runs short. Interface components such as contact pins, etc., are subjected to high stresses.

[0003] WO 2018 / 114349 A1, for example, is known from the prior art, which discloses an electrical machine with a cooling device. A connector is connected to a carrier plate. However, it is not clear to what extent this connector is designed to withstand loads with regard to possible relative movements between the connector and any devices connected to it.

[0004] Furthermore, US 2017 / 0200704 A1 shows a semiconductor device with multilayer carrier plates and contact pins which have sections with low stiffness.

[0005] DE 10 2017 218 182 A1 discloses an electrically conductive contact element in which a wave-shaped deformation section is arranged between a first contact section and a second contact section.

[0006] US 2009 / 0108688 A1 describes a connection structure for connecting an electrical device to a power supply unit. The connection structure comprises a connecting means with a deformable portion for compensating for misalignment between the power supply unit and a busbar.

[0007] Furthermore, DE 10 2012 223 431 A1 shows a housing for an electrical machine with plug contacts which have meander-shaped sections.

[0008] The invention is based on the object of providing a contact pin which is highly suitable for locally different mechanical and / or thermal loads.

[0009] According to the invention, this object is achieved with a contact pin of the type mentioned at the outset, in which the second component longitudinal section is tapered in the direction of its longitudinal axis and has a plurality of recesses, whereby the first component longitudinal section has a greater rigidity than the second component longitudinal section.

[0010] This results in minimal contact zone wear between the contact pin and the components or devices connected to it, while also providing favorable assembly properties. The first longitudinal component section of the contact pin is designed to be rigid, allowing it to be pressed into a carrier plate, for example.

[0011] The second component longitudinal section of the contact pin is less stiff than the first component longitudinal section and can deform elastically depending on the loads acting on it (e.g. mechanical loads due to relative movements between components connected to the contact pin or thermal loads due to heat transfer from the connected components to the contact pin).

[0012] Depending on the type of load, the greater stiffness of the first longitudinal component section or the lower stiffness of the second longitudinal component section can be, for example, flexural stiffness and / or torsional stiffness, etc. A low stiffness of the second component section is achieved by having the majority of recesses. A low stiffness of the second component section can also be achieved, for example, by having multiple, counter-directional curves and / or multiple slots, etc.

[0013] Fig. 1 shows an exemplary embodiment of an electrical machine according to the invention in a sectional view.

[0014] A control or regulation unit designed as an electronic controller 5 has a carrier plate 3 which, completely encapsulated by a thermally conductive potting compound 2 made of polyurethane, is arranged in a first housing 8 which is made of glass fiber reinforced polyamide.

[0015] Provided on the carrier plate 3 are a first assembly element 11, which is designed as a pressure sensor, as well as a second assembly element 12, a third assembly element 13, and a fourth assembly element 14, which are encased in the potting compound 2. The first assembly element 11 is arranged on a bottom side 15 of the carrier plate 3, while the second assembly element 12, the third assembly element 13, and the fourth assembly element 14 are arranged on a top side 16 of the carrier plate 3. The carrier plate 3 is thus equipped on both sides.

[0016] The first housing 8 and the support plate 3 are cylindrical. The first housing 8 is closed at the front by an inserted plate 10. The plate 10 is clamped to the first housing 8.

[0017] The potting compound 2 completely fills a housing interior formed by the first housing 8 and the plate 10. The polyurethane of the potting compound 2 has a Shore A hardness in the range between 48 and 53, a thermal conductivity of 0.97 W / mK, and a glass transition temperature of approximately -60 °C. The electric machine can therefore be used in a wide temperature range.

[0018] A polyurethane version of the potting compound 2 is a favorable solution. However, according to the invention, it is also conceivable to form the potting compound 2 from silicone with a Shore A hardness in the range between 45 and 55, thereby achieving properties of the potting compound 2 comparable to those of the polyurethane version.

[0019] In the area of ​​the upper side 16 of the carrier plate 3, a first contact pin 6 designed as a first silver contact pin is connected to the carrier plate 3 and protrudes from the first housing 8. Via this first contact pin 6 and in Fig. 1 Further contact pins, not visible, which are also designed as silver contact pins, are connected to the carrier plate 3 in the area of ​​the upper side 16 and protrude from the first housing 8, the carrier plate 3 is connected to a power supply, not shown.

[0020] In the area of ​​the underside 15 of the carrier plate 3, a second contact pin 7 designed as a second silver contact pin and Fig. 1 Not visible, further contact pins designed as additional silver contact pins are connected to the carrier plate 3.

[0021] The controller 5 is connected to a motor 17 of a fluidic actuator 1 designed as a hydraulic actuator via the second contact pin 7 and the further contact pins arranged in the area of ​​the underside 15 of the carrier plate 3.

[0022] The controller 5 is connected to the actuator 1 via a clamp connection. However, according to the invention, it is also conceivable to provide screw connections between the controller 5 and the actuator 1.

[0023] The first contact pin 6, the second contact pin 7 and the other contact pins are partially encased by the potting compound 2.

[0024] A first conducting path 18 is provided between the second contact pin 7 and the motor 17, and further conducting paths (not visible) are provided between the further contacts arranged in the area of ​​the underside 15 of the carrier plate 3.

[0025] The first line path 18 and the further line paths are arranged within the actuator 1, in a ring part 19 of the actuator 1. Cables running between the controller 5 and the actuator 1 are not required.

[0026] The actuator 1 or its ring part 19 is connected flush to the control or regulation unit or is flush with the first housing 8.

[0027] The motor 17 is designed as a brushless DC electric motor with an annular stator 20 and a rotor 21. The stator 20 is provided in the annular part 19 of the actuator 1. The rotor 21, which is rotatably but immovably mounted in the actuator 1, is driven via the stator 20 and its connection to the controller 5.

[0028] Rotational movements of the rotor 21 are transmitted to a spindle-shaped section of a piston rod 22, whereby the piston rod 22 and a piston 23 connected to it perform translational movements in the direction of a longitudinal axis 24.

[0029] The piston rod 22 and the piston 23 are provided in a cylinder 25 of the actuator 1, which is enclosed by the ring part 19. The piston rod 22 is mounted and guided in the cylinder 25 via a bearing (not shown), so that it can perform rotational and translational movements.

[0030] A first seal, also not shown, is provided between the piston rod 22 and the cylinder 25 to prevent moisture and particles, etc., from penetrating into the cylinder 25.

[0031] A chamber 4, formed by the movable piston 23 and the cylinder 25, is filled with a hydraulic fluid. The cylinder 25 therefore functions as a second housing 9 with respect to this hydraulic fluid.

[0032] The chamber 4 or the second housing 9 is directly adjacent to the plate 10 of the controller 5. The control or regulation unit contacts the chamber 4 in the area of ​​the potting compound 2.

[0033] As a result, heat transferred from the carrier plate 3 or the first assembly element 11, the second assembly element 12, the third assembly element 13 and / or the fourth assembly element 14 into the potting compound 2 is dissipated from the potting compound 2 via the plate 10 into the chamber 4, i.e. to the hydraulic fluid.

[0034] According to the invention, it is also possible to dispense with the plate 10, whereby the casting compound 2 is directly adjacent to the chamber 4.

[0035] The chamber 4 is connected via a first hydraulic line 26 to a hydraulic tank (not shown), ie is supplied with hydraulic fluid via this hydraulic tank.

[0036] Chamber 4 is connected to a motor vehicle's hydraulic telescopic shock absorber (also not shown) via a second hydraulic line 27. The damping effect of the telescopic shock absorber is adjusted by means of the piston 23 or the pressure of the hydraulic fluid. For this purpose, the pressure in chamber 4 is continuously measured by means of the pressure sensor or the first component 11, whose measuring probe extends into chamber 4.

[0037] A second seal (not shown) is provided between the first assembly element 11 and the cylinder 25 to prevent wetting of the potting compound 2 with hydraulic fluid.

[0038] The controller 5 continuously compares the measured pressure with a defined target pressure. Based on a difference between the measured pressure and the target pressure, the controller 5 controls the motor 17 via appropriate voltage inputs to the stator 20. This means that the motor 17 is switched on or off, or a speed of the rotor 21 is adjusted in order to achieve or maintain the target pressure in the hydraulic fluid or in the telescopic shock absorber by means of appropriate piston positions and movements.

[0039] Designing actuator 1 as a hydraulic actuator is a cost-effective solution. However, according to the invention, it is also conceivable to design actuator 1, for example, as a pneumatic actuator and use it to adjust brake cylinder pressures in a bogie brake of a rail vehicle.

[0040] Furthermore, it is conceivable that the control or regulating unit could be used not as a controller 5, but as a control unit, i.e., without measuring a variable to be controlled by means of a sensor or without this variable having a feedback effect on a manipulated variable. For example, the control unit could be used in a hydraulic clamping device.

[0041] In this context, it is also conceivable that the control or regulation unit could be designed as an electronic control unit (ECU).

[0042] The second contact pin 7 is connected via a Fig. 2 and Fig. 3 shown first component longitudinal section 28 with the carrier plate 3 and via a second component longitudinal section , also in Fig. 2 and Fig. 3 visible, immediately adjacent third component longitudinal section 30, which in Fig. 2 and Fig. 3 is shown, connected to the ring part 19 of the actuator 1, i.e., to a component of the electrical machine different from the support plate 3. The first component longitudinal section 28 has a greater rigidity than the second component longitudinal section 29.

[0043] According to the invention, it is also conceivable that the second component longitudinal section 29 is connected to the ring part 19.

[0044] In Fig. 2 a first exemplary embodiment of a contact pin according to the invention is shown, which can also be used in Fig. 1 shown (as second contact pin 7). This contact pin has a first component longitudinal section 28, a second component longitudinal section 29, and a third component longitudinal section 30, which are aligned in the direction of a longitudinal axis 31.

[0045] The first component longitudinal section 28 has a greater stiffness than the second component longitudinal section 29. This greater stiffness is both a bending stiffness and a torsional stiffness.

[0046] The fact that the second longitudinal section 29 of the component is tapered in the direction of the longitudinal axis 31 and its longitudinal axis 31, respectively, and is curved in several opposite directions, contributes to advantageous elastic component behavior and stiffness behavior. A first bend 34 and further bends are provided, each of which is bent by 90° and 180°, respectively, with respect to a Fig. 2 projecting vertical axis 32 of the second component longitudinal section 29 are curved.

[0047] Furthermore, in order to improve the elastic properties of the contact pin, a first recess 35 and further recesses, ie a plurality of recesses, are provided in the second component longitudinal section 29 in the direction of its vertical axis 32.

[0048] Furthermore, the second component longitudinal section 29 is designed with multiple slots, ie a first slot 36 and further slots are provided in the direction of a transverse axis 33 of the second component longitudinal section 29.

[0049] The first component longitudinal section 28 is directly connected to the second component longitudinal section 29 and is designed as a plug, which is inserted into a Fig. 1 shown carrier plate 3 is pressed in.

[0050] The third component longitudinal section 30 directly adjoins the second component longitudinal section 29, is partly cuboid-shaped and has partly bevelled edges. The contact pin is connected to a Fig. 1 shown ring part 19 of an actuator 1.

[0051] Fig. 3 shows a second exemplary embodiment of a contact pin according to the invention. This contact pin is similar to the first exemplary embodiment of a contact pin according to the invention shown in Fig. 2 Therefore, in Fig. 3 largely the same reference symbols as in Fig. 2 used.

[0052] In contrast to Fig. 2 A second longitudinal component section 29 of the contact pin has no pronounced curvatures or bends on its outer sides. This simplifies manufacturing. List of designations

[0053] 1 Actuator 2 Potting compound 3 Support plate 4 Chamber 5 Controller 6 First contact pin 7 Second contact pin 8 First housing 9 Second housing 10 Plate 11 First assembly element 12 Second assembly element 13 Third assembly element 14 Fourth assembly element 15 Bottom 16 Top 17 Motor 18 First line path 19 Ring part 20 Stator 21 Rotor 22 Piston rod 23 Piston 24 Longitudinal axis 25 Cylinder 26 First hydraulic line 27 Second hydraulic line 28 First component longitudinal section 29 Second component longitudinal section 30 Third component longitudinal section 31 Longitudinal axis 32 Vertical axis 33 Transverse axis 34 First bend 35 First recess 36 First slot

Claims

1. Contact pin for an electric machine, in which at least one first component longitudinal portion (28) and one second component longitudinal portion (29) are provided, characterized in that the second component longitudinal portion (29) is embodied in a manner narrowing in the direction of its longitudinal axis (31) and has a plurality of recesses, as a result of which the first component longitudinal portion (28), which is in the form of a two-pin plug, has greater flexural rigidity and at the same time greater torsional rigidity than the second component longitudinal portion (29).

2. Contact pin according to Claim 1, characterized in that the greater rigidity is greater flexural rigidity.

3. Contact pin according to Claim 1 or 2, characterized in that the greater rigidity is torsional rigidity.

4. Contact pin according to one of Claims 1 to 3, characterized in that the second component portion (29) is embodied in a manner bent multiply in opposite directions.

5. Contact pin according to one of Claims 1 to 4, characterized in that the second component portion (29) is embodied in a multiply slotted manner.

6. Contact pin according to one of Claims 1 to 5, characterized in that the first component longitudinal portion (28) is connectable to a support plate (3) of an electric machine.

7. Contact pin according to one of Claims 1 to 6, characterized in that the second component longitudinal portion (29) or a third component longitudinal portion (30) adjoining the second component longitudinal portion (29) is connectable to a component, other than the support plate (3), of the electric machine.

8. Support plate having at least one contact pin according to one of Claims 1 to 7.

9. Electric machine having at least one contact pin according to one of Claims 1 to 7.