DE102020118046A1 - Contact assembly for a solenoid valve and pump assembly with such a contact assembly - Google Patents

Abstract

The invention relates to a contact assembly (50) for a solenoid valve, having a wall (72) that separates a wet area from a dry area, and a terminal contact (52) that extends through the wall (72) and a first contact section (54) , has a second contact section (62) and an intermediate sealing section (58), characterized in that a sealing chamber (78) is formed in the wall (72) and that an elastic seal (74) is arranged in the sealing chamber (78), which is elastically prestressed both on the outside on the inner wall of the sealing chamber (78) and on the inside on the sealing section (58) of the connection contact (52). The invention also relates to a pump unit with such a contact assembly.

Description

The invention relates to a contact assembly for a solenoid valve, having a wall separating a wet area from a dry area, and a terminal contact extending through the wall and having a first contact portion, a second contact portion and a sealing portion therebetween. The invention also relates to a pump unit with such a contact assembly.

The pump unit has a pump, a reservoir for hydraulic fluid and at least one solenoid valve and is used to provide hydraulic pressure for actuating an actuator in the drive train of a motor vehicle, in particular a clutch or transmission actuator. With the hydraulic pressure, a clutch can be switched between an open and a closed position or, in the case of a gear actuator, a specific gear stage can be switched.

The solenoid valve can be arranged inside the reservoir so that it is surrounded by hydraulic fluid. In this way it can be protected from corrosion. In addition, the hydraulic fluid can be used to dissipate waste heat generated in the solenoid valve.

The solenoid valve is contacted by means of two connection contacts, which extend from the area in which there is hydraulic fluid (i.e. the wet area) through the wall (usually of the reservoir) into an area in which there is no hydraulic fluid (i.e. the dry area). . It is important for the reliable function of the pump unit that the passage of the connection contact from the wet area to the dry area is reliably sealed over the entire service life of the pump unit.

The area in which the connection contact extends through the wall is usually cast with a casting compound in order to achieve the desired seal in this way. However, it has been found that, despite the casting compound, under certain circumstances hydraulic fluid can get from the wet area into the dry area.

The object of the invention is to improve the sealing between the wet area and the dry area in the area where the connection contact is led through, in particular in such a way that a reliable seal is obtained over the entire service life.

To solve this problem, it is provided according to the invention in a contacting assembly of the type mentioned at the outset that a sealing chamber is formed in the wall and that an elastic seal is arranged in the sealing chamber, which is elastically prestressed both on the outside on the inner wall of the sealing chamber and on the inside on the sealing section of the Connection contact is present. The invention is based on the surprising finding that reliable sealing can be ensured over the entire service life in a technically very simple manner, namely by means of a seal inserted into a sealing chamber under prestress.

According to one embodiment, it is provided that the sealing chamber has a closed inner wall in the circumferential direction. This ensures that the seal is evenly preloaded.

The sealing portion of the terminal preferably has a generally rectangular cross-section with rounded or chamfered corners. Avoiding sharp edges ensures that the seal fits snugly against the sealing portion of the terminal contact.

The seal can have an inner side which is smooth in the longitudinal direction, so that a large surface area of contact is created with the sealing section of the terminal contact. This is advantageous for good sealing.

The seal can have an outer side that is corrugated in the longitudinal direction, so that there are locally areas with increased surface pressure between the seal and the inner wall of the sealing chamber.

According to one embodiment, it is provided that three circumferential ribs are provided on the outside. These rest against the inner wall of the sealing chamber with pre-tension and ensure a total of three separate sealing areas. So even if the hydraulic fluid were to get behind the first circumferential rib, there are still two more ribs available for sealing.

A pressure section can be provided on the connection contact between the sealing section and the contact section located in the wet area, which press-on section protrudes in the radial direction beyond the sealing section. The pressure section serves as a contact surface for the seal, which acts in the axial direction, so that the latter is correctly positioned on the seal section.

The sealing chamber can be designed in such a way that the pressing section bears against the outside of the sealing chamber. This mechanically stabilizes and positions the terminal contact, which ensures that the contact sections are located precisely in the desired position.

A locking section, which is anchored in the wall, can be provided on the connection contact between the contact section lying in the dry area and the sealing section. With the locking section, the terminal can be automatically fixed in the wall without the need for external actions.

According to a technically simple configuration, it can be provided that the locking section has a fir tree structure which is dug into the material of the wall. With the fir tree structure, a form fit with the material of the wall can be achieved simply by pressing the terminal contact into the wall in the axial direction.

The seal is preferably made of hydrogenated acrylonitrile butadiene rubber, so that it has a particularly high temperature resistance.

The seal is preferably compressed by 5% to 10% of its dimensions in the radial direction, so that on the one hand the necessary high pressure forces are achieved both on the inner wall of the sealing chamber and on the sealing section of the connection contact and on the other hand the seal can still be pushed into the sealing chamber.

To solve the above task, a pump unit is also provided for providing hydraulic pressure for actuating an actuator in the drive train of a motor vehicle, in particular a clutch or transmission actuator, with a pump, a reservoir for hydraulic fluid, at least one solenoid valve that is arranged inside the reservoir , so that it is surrounded by hydraulic fluid, and a contacting assembly according to any one of the preceding claims, wherein the wall of the contacting assembly is part of the reservoir and at least two connection contacts are provided, which are used to connect the solenoid valve. With regard to the resulting advantages, reference is made to the explanations above.

• - 1 ein Pumpenaggregat in einer perspektivischen Ansicht;
• - 2 das Pumpenaggregat von 1 in einer perspektivischen Explosionsansicht;
• - 3 das Pumpenaggregat von 1 in einer Seitenansicht;
• - 4 das Pumpenaggregat von 3 in einer ersten Schnittansicht;
• - 5 das Pumpenaggregat von 3 in einer zweiten Schnittansicht;
• - 6 einen Hydraulikschaltplan des Pumpenaggregats;
• - 7 einen bei einer erfindungsgemäßen Kontaktierungsbaugruppe verwendeten Anschlusskontakt mit Dichtung in einer Seitenansicht;
• - 8 den Anschlusskontakt von 7 in einer zweiten Seitenansicht;
• - 9 den Anschlusskontakt von 7 in einer perspektivischen Ansicht;
• - 10 in einer perspektivischen Ansicht den Anschlusskontakt von 9 ohne Dichtung;
• - 11 die beim Anschlusskontakt von 9 verwendete Dichtung in einer perspektivischen Ansicht;
• - 12 in einem Schnitt eine Kontaktierungsbaugruppe mit Anschlusskontakt und Dichtung der 7 bis 11;
• - 13 die Kontaktierungsbaugruppe von 12 mit einem angebrachten Anschlussstecker;
• - 14 eine Draufsicht auf ein Pumpenaggregat mit zwei Magnetventilen;
• - 15 in vergrößerter Ansicht eines der Magnetventile von 14;
• - 16 in vergrößerter Ansicht zwei Anschlusskontakte, die zum Anschließen des Magnetventils von 15 verwendet werden;
• - 17 einen Schnitt entlang der Ebene XVII-XVII von 15;
• - 18 in einer perspektivischen Ansicht eine Baugruppe mit einem Magnetventil und einer Kontaktierungsbaugruppe gemäß einer alternativen Ausführungsform;
• - 19 das Magnetventil und die Kontaktierungsbaugruppe von 18 in einer weiteren perspektivischen Ansicht; und
• - 20 in einer Schnittansicht das Magnetventil und die Kontaktierungsbaugruppe der 18 und 19.

The invention is described below with reference to an embodiment which is illustrated in the accompanying drawings. In these show:

• - 1 a pump unit in a perspective view;
• - 2 the pump unit from 1 in an exploded perspective view;
• - 3 the pump unit from 1 in a side view;
• - 4 the pump unit from 3 in a first sectional view;
• - 5 the pump unit from 3 in a second sectional view;
• - 6 a hydraulic circuit diagram of the pump unit;
• - 7 a terminal contact used in a contacting assembly according to the invention with a seal in a side view;
• - 8th the connection contact of 7 in a second side view;
• - 9 the connection contact of 7 in a perspective view;
• - 10 in a perspective view the terminal contact of 9 without seal;
• - 11 the at the connection contact of 9 seal used in a perspective view;
• - 12 in a section a contacting assembly with connection contact and seal 7 until 11 ;
• - 13 the contacting assembly of 12 with an attached connector plug;
• - 14 a plan view of a pump unit with two solenoid valves;
• - 15 in an enlarged view of one of the solenoid valves from 14 ;
• - 16 in an enlarged view, two connection contacts for connecting the solenoid valve from 15 be used;
• - 17 a section along the plane XVII-XVII of 15 ;
• - 18 in a perspective view, an assembly with a solenoid valve and a contacting assembly according to an alternative embodiment;
• - 19 the solenoid valve and the contacting assembly from 18 in another perspective view; and
• - 20 in a sectional view, the solenoid valve and the contacting assembly of 18 and 19 .

In the 1 until 6 is a pump unit shown, which is used to a hydraulic pressure (and also a flow of hydraulic fluid) that can be converted into an actuation stroke by an actuator in the powertrain of a motor vehicle. With the actuating stroke, for example, a clutch can be closed or opened, or a gear stage of a transmission can be shifted or brought into the neutral position.

The pump unit has as essential components (see in particular the 1 and 2 ) a drive motor 1, a pump 2, control electronics 3, two solenoid valves 4, two pressure sensors 5, which are accommodated in a common housing, and a reservoir 6.

The central component of the pump assembly is a pump housing 7 to which the solenoid valves 4 are attached and to which the reservoir 6 is also attached. The pressure sensors 5 are also attached to the pump housing 7 .

On the opposite side to the reservoir 6 , an electronics housing 8 is attached to the pump housing 7 , which on the one hand accommodates the control electronics 3 and on the other hand contains the stator of the electric motor 1 . A cover 9 is attached to the electronics housing 8, which closes the control electronics 3 and serves to dissipate the heat loss of the control electronics 3 to the environment.

As in the 4 and 5 can be seen, the solenoid valves 4 are arranged within the reservoir 6 .

The electric motor 1 is a brushless electric motor with which the pump 2 is driven.

The pump 2 can be designed as a rotary vane pump with a rotor 10 having a plurality of chambers, in each of which a rotary vane element 14 is arranged. The rotary slide elements 14 are cylindrical rollers. The pump is therefore a roller cell pump.

The cylindrical rollers roll on the inner contour of a stator 16, which defines a variable volume in the circumferential direction. Accordingly, during a rotation of the rotor 10 through 360°, each rotary slide element runs through a sequence of intake area and pressure area twice. Accordingly, the pump has two suction connections S and two pressure outlets D.

Due to the two independent pressure outlets D of the pump 2, the pump assembly also has two mutually independent pressure outlets 20, via which the hydraulic pressure that is generated by the pump assembly to actuate the actuator is provided.

The pump has a symmetrical design, with all the components that are explained below being present for each pressure outlet. For example, when “the” solenoid valve is described below, this applies to both solenoid valves, since there is one for each pressure outlet.

A check valve 22 is arranged downstream of each pressure outlet D of the pump 2 . The check valves 22 have a rubber valve seat.

The inlet 24 of the solenoid valve 4 is located downstream of the outlet of the check valve 22. Depending on the setpoint pressure and the actual pressure measured at the pressure sensor 5, each of the solenoid valves 4 is controlled in such a way that the desired hydraulic pressure is present at the pressure outlet 20 of the pump unit. Excess hydraulic fluid is returned directly to the reservoir 6 through a return line 26 .

The solenoid valves 4 are designed as proportional valves and have a ball as the valve element which, together with the valve seat, ensures that the solenoid valve 4 is leak-free when it is closed.

The reservoir 6 is divided into two chambers 40, 42, with a suction opening which leads to the suction connection S of the pump 2 being arranged in each chamber 40, 42. The division of the internal volume of the reservoir 6 into two separate chambers 40, 42 ensures that if one of the hydraulic circuits has a leak, a certain residual volume is still available in the other hydraulic circuit, with which the non-defective hydraulic circuit can continue to be operated for a certain period of time can.

For example, after receiving a warning about the failure of the first hydraulic circuit, a driver can still drive the vehicle safely into a parking bay or parking space, since, for example, in a dual-clutch transmission, a clutch and the shift stages of the transmission assigned to it are still operational.

In order to divide the reservoir 6 into the two chambers 40, 42, a substantially horizontally extending partition wall 46 can be used, which has a vertically extending end wall 48.

How from the 2 , 4 and 5 known, the solenoid valves 4 are within the front Council container 6 arranged. In each case, a solenoid valve is arranged in a chamber 40, 42.

In order to connect the solenoid valves 4 electrically, a contact assembly 50 is provided for each solenoid valve 4 . This is in the 1-5 only indicated and is subsequently based on the 7 until 17 explained in more detail.

To connect the solenoid valves 4, two connection contacts 52 (see in particular 10 ) used. Each connection contact here has a first contact section 54 , a pressing section 56 , a sealing section 58 , a locking section 60 and a second contact section 62 .

Each connection contact 52 consists of an electrically conductive metal and can, in particular, be stamped and embossed.

The contact sections 54, 62 are designed in such a way that they can be contacted with suitable contact elements. The first contact portion 54 is associated with the solenoid valve 4 and is used with schematically in the 5 , 13 and 17 shown spring contacts 64 to be contacted, which are provided with insulation displacement terminals to connect the winding wire of the coils of the solenoid valves 4. The spring contacts 64 of a solenoid valve 4 can be combined in a solenoid valve connector plug 66 .

The second contact section 62 is intended to be contacted by means of a conventional external connector plug (not shown here) which is inserted into a connector chamber 68 (see in particular Figs 12 and 13 ) can be plugged in.

The anchoring section 60 has a fir tree structure 70, that is to say a plurality of projections lying next to one another, the height of which increases in a press-in direction. Each connection contact 52 is anchored in a passage or a receiving slot of a wall 72 by means of the anchoring section 60 . It is sufficient here to press the connection contact 52 into the wall, so that the fir tree structure digs into the material of the wall and ensures a positive fit there.

The seal portion 58 serves to receive a seal 74 . The sealing section 58 is provided here with a total of four chamfers 75, so that it does not have any sharp corners, but has an octagonal cross section.

Alternatively, the corners can also be rounded, so that a flat cross section is formed with 90° bends instead of the corners or even with two 180° bends instead of the narrow sides.

The seal 74 has a smooth inner side in the longitudinal direction, the cross section of which corresponds to the cross section of the seal section 58 in terms of shape. The dimensions of the inside of the seal 74 are slightly smaller than the dimensions of the seal section 58 so that the seal 74 sits on the seal section 58 with a press fit.

The pressure section 56 is located on the side of the sealing section 58 facing away from the anchoring section 60 and protrudes outwards in a radial direction (relative to the central longitudinal axis of the connection contact 52), so that it has the shape similar to the crossguards of a sword (see Fig 10 ).

Gasket 74 has an outer surface that is longitudinally corrugated. In the exemplary embodiment shown, three ribs 76 running in the circumferential direction are formed as a result.

The seal 74 consists of elastically deformable rubber that has the desired temperature and media resistance. The seal is particularly preferably made of hydrogenated acrylonitrile butadiene rubber (HNBR).

In the 12 , 13 and 17 the terminal contacts 52 are shown mounted in the wall 72 . It can be seen (see in particular the 12 and 13 ) that the seal 74 is resiliently biased in a seal chamber 78 formed in the wall 72 is retained. The seal 74 thus rests firmly with the circumferential ribs 76 on the inner wall of the sealing chamber 78, as a result of which the inside of the seal 74 is also pressed firmly against the sealing section 58 of the terminal contact 52.

The connection contacts 52 are mounted by being pressed into the wall 72 with their anchoring section 60 . In the process, the fir tree structure 70 digs into the material of the wall, so that the connecting contacts 52 latch there in a form-fitting manner.

In the assembled state, the pressure sections 56 lie on the outside of the sealing chamber 78 (see in particular 12 , 13 and 17 ). On the one hand, this ensures that the seal 74 is kept compressed in a controlled manner in the axial direction. Furthermore, the pressing sections 56 serve to stabilize the connection contacts 52 since, in addition to the anchoring section 60, they offer a further mechanical support located at a distance therefrom. the Connection contacts 52 are thus reliably secured against tipping.

In the 18 until 20 a second embodiment is shown. The same reference numerals are used for the components known from the previous embodiment, and reference is made to the above explanations in this respect.

A first difference between the first and the second embodiment is that a separate housing 80 is provided for the solenoid valve 4 in the second embodiment. This housing can be attached to a pump, for example, with a flange 82 and fastening eyes 84 .

The housing 80 surrounds the solenoid valve 4 in such a way that hydraulic fluid flows around it. From the solenoid valve 4, a valve seat 86, a valve tappet 88, an armature 90 and a coil 92 are shown here schematically.

In the second embodiment too, the contacting assembly 50 serves to establish an electrical contact from a wet area (in 20 on the left side of flange 82) to a drying area (on the right side of flange 82).

A further difference from the first embodiment is that the connection contact 52 is not designed in one plane here, but is angled.

The first contact section 54 facing the solenoid valve 4 thus extends parallel to the second contact section 62, but is laterally offset relative to it. The pressing section is implemented here by a transversely extending area 57 which connects the two contact sections 54, 62 to one another. It also serves as an abutment for seal 74.

In the second embodiment, too, the seal 74 is pressed into the contact chamber 78 in a pretensioned state. For this purpose, the connection contact 52 is pressed into the housing 80 together with the preassembled seal 74 in the direction of the arrow P, so that it mechanically latches in the wall 72 . The gasket 74 then provides the desired seal between the wet area and the dry area.

Claims (13)

Contacting assembly (50) for a solenoid valve, having a wall (72) separating a wet area from a dry area, and a terminal contact (52) extending through the wall (72) and a first contact section (54), a second contact section (62) and an intermediate sealing section (58), characterized in that a sealing chamber (78) is formed in the wall (72) and that an elastic seal (74) is arranged in the sealing chamber (78) and is elastically pretensioned both on the outside on the inner wall of the sealing chamber (78) and on the inside on the sealing section (58) of the connection contact (52). Contacting assembly according to claim 1 , characterized in that the sealing chamber (78) has a closed inner wall in the circumferential direction. Contacting assembly according to claim 1 or claim 2 , characterized in that the sealing portion (58) has a generally rectangular cross-section with rounded or chamfered corners. Contacting assembly according to one of the preceding claims, characterized in that the seal (74) has a smooth inner side in the longitudinal direction. Contacting assembly according to one of the preceding claims, in that the seal (74) has a corrugated outer side in the longitudinal direction. Contacting assembly according to claim 5 , characterized in that three circumferential ribs (76) are provided on the outside. Contacting assembly according to one of the preceding claims, that a pressure section (56) is provided between the sealing section (58) and the contact section (54) in the wet area, which protrudes in the radial direction over the sealing section (58). Contacting assembly according to claim 7 , characterized in that the pressing portion (56) rests on the outside of the sealing chamber (78). Contacting assembly according to one of the preceding claims, that between the contact section (62) lying in the dry area and the sealing section a locking section (60) is provided, which is anchored in the wall (72). Contacting assembly according to claim 9 , characterized in that the locking portion (60) has a fir tree structure (70). points, which is buried in the material of the wall (72). Contacting assembly according to one of the preceding claims, characterized in that the seal (74) consists of hydrogenated acrylonitrile butadiene rubber (HNBR). Contacting assembly according to one of the preceding claims, characterized in that the seal (74) is compressed in the radial direction by 5% to 10% of its dimensions. Pump unit for providing hydraulic pressure for actuating an actuator in the drive train of a motor vehicle, in particular a clutch or transmission actuator, with a pump (2), a reservoir (6) for hydraulic fluid, at least one solenoid valve (4) which is inside the reservoir (6) is arranged so that it is surrounded by hydraulic fluid, and a contacting assembly (50) according to any one of the preceding claims, wherein the wall (72) of the contacting assembly (50) is part of the reservoir and at least two connection contacts (52) are provided, which are Connecting the solenoid valve (4) are used.

Images