Electric-motor-driven hydraulic pump actuator

Abstract

The application relates to an electric-motor-driven hydraulic pump actuator (1) having two planar housing bodies (3, 4) which are tightly interconnected with the interposition of an intermediate plate (5) in order to constitute a housing (2), in which a drive shaft (9) is rotatably mounted, wherein the intermediate plate (5) has three layers and consists of a base plate (52) and a first and a second outer plate (51, 53), each adjoining one of the two main surfaces of the base plate (52). In order to improve the electric-motor-driven hydraulic pump actuator (1) in terms of function and / or production, a bearing device (15) for the drive shaft (9) is secured in one (3) of the housing bodies (3, 4) by means of the intermediate plate (5).

Description

[0001] Electrically driven hydraulic pump actuator

[0002] The invention relates to an electrically driven hydraulic pump actuator with two plate-like housing bodies which are tightly connected to each other by means of an intermediate sheet to form a housing in which a drive shaft is rotatably mounted.

[0003] German patent application DE 10 2010 054 250 A1 discloses a hydraulic control system with a control plate arrangement and a hydraulic pumping device for pumping a hydraulic medium, wherein the hydraulic pumping device is integrated into the control plate arrangement, wherein a first hydraulic pump is integrated into a first control plate of the control plate arrangement, wherein a second hydraulic pump is integrated into a second control plate of the control plate arrangement, wherein the two hydraulic pumps are driven by a common pump shaft, wherein an intermediate plate is arranged between the two control plates through which a pillow block extends from the first to the second control plate.

[0004] German patent application DE 10 2005 058 843 A1 discloses an intermediate plate for an electrohydraulic control device, wherein the control device has a control housing with at least two control housing parts provided with fluid channels, between which the intermediate plate is arranged and creates connections between fluid channels of the control housing parts via passages provided at least in certain areas, and the control housing is provided with at least one electrically actuated valve, wherein the intermediate plate is designed to fix the valve to the control housing.

[0005] From DE 10 2014 210 301 A1, a multi-layered intermediate sheet is known for a control system with at least two channel-carrying components and an intermediate sheet arranged between the two channel-carrying components. The intermediate sheet itself has at least a base sheet and an outer sheet as the active layer. A plurality of fluid passage openings and a plurality of passage openings for fasteners extend through the entire intermediate sheet. The fluid passage openings connect channels of one channel-carrying component with channels of the other channel-carrying component, thus enabling the transfer of control medium from a channel of one channel-carrying component to a channel of the other channel-carrying component.To seal the channels of the channel-carrying component opposite the at least one outer sheet from each other and to the outside, the outer sheet has at least one multi-branched corrugation system that ensures the macro-sealing of the channels. In addition, the at least one intermediate sheet is coated in sections, at least on its surface directly opposite the channel-carrying component, to ensure or improve the micro-sealing.

[0006] The object of the invention is to functionally and / or technically improve an electrically driven hydraulic pump actuator with two plate-like housing bodies forming hydraulic control housing parts, which are tightly connected to each other by means of an intermediate sheet to form a housing in which a drive shaft is rotatably mounted.

[0007] The problem with an electrically driven hydraulic pump actuator, comprising two plate-like housing bodies tightly connected by an intermediate plate to form a housing in which a drive shaft is rotatably mounted, is solved by securing a bearing arrangement for the drive shaft in one of the housing bodies using the intermediate plate. The intermediate plate is constructed in three layers, consisting of a base plate and a first and a second outer plate, each adjoining one of the two main surfaces of the base plate. The plate-like housing bodies are preferably designed as plates and are then also referred to as housing plates. An electric motor is arranged in one of the plate-like housing bodies, providing the electric drive for the hydraulic pump actuator.A hydraulic pump is arranged in the other housing body, driven by the electric motor via the drive shaft. The intermediate plate serves a sealing function between the two plate-like housing bodies. Furthermore, the intermediate plate advantageously has connecting openings that allow the passage of hydraulic fluid. The intermediate plate also advantageously serves to implement at least one valve function. In addition to its sealing function and other known functions of the multifunctional intermediate plate, the claimed intermediate plate is advantageously used to secure the bearing assembly for the drive shaft in the housing body. The bearing assembly is preferably secured by the intermediate plate in an axial direction. The term "axial" refers to an axis of rotation of the drive shaft. Axial means in the direction of or parallel to the axis of rotation of the drive shaft.The bearing assembly preferably comprises a fixed bearing and a floating bearing. The intermediate plate advantageously secures the fixed bearing of the bearing assembly axially. The intermediate plate provides a space-saving and cost-effective solution for securing the bearing assembly.

[0008] A preferred embodiment of the electrically driven hydraulic pump actuator is characterized in that the intermediate plate exerts an axial clamping force on the bearing assembly for the drive shaft in the housing body. The bearing assembly is advantageously arranged in a recess in the housing body. The bearing assembly, in particular the fixed bearing of the bearing assembly, is supported on one side facing away from the intermediate plate by both the drive shaft and the housing body. The axial clamping force is applied to the other side of the bearing assembly by the intermediate plate. For this purpose, a corresponding overlap is provided between the bearing assembly, in particular an outer bearing ring of the fixed bearing, and the intermediate plate, which preferably provides the clamping force for bearing retention by means of a spring action.

[0009] Another preferred embodiment of the electrically driven hydraulic pump actuator is characterized in that the second outer plate of the intermediate plate comprises at least one preload area which is spring-loaded against the bearing assembly in the housing body. The preload area can be configured differently on the intermediate plate. The essential feature of the preload area is that it comprises at least one intermediate plate section with which the second outer plate of the intermediate plate is spring-loaded against the bearing assembly. A particularly preferred embodiment of the electrically driven hydraulic pump actuator is characterized in that the preload area of ​​the intermediate plate comprises at least one projecting bead in the second outer plate which is formed in the circumferential region of a through-hole in the intermediate plate through which the drive shaft extends.One or more beads can be provided, arranged radially or concentrically around the circumference of a through hole. The arrangement of the bead(s) can ensure uniform preloading of the bearing assembly.

[0010] Another preferred embodiment of the electrically driven hydraulic pump actuator is characterized in that the bearing arrangement is designed as a fixed bearing, which is combined in the housing body with a floating bearing for the drive shaft. This type of bearing arrangement is known per se. The essential feature is that the fixed bearing is axially secured to the intermediate plate. This eliminates the need to press the fixed bearing into the housing body or to secure it with a retaining ring.

[0011] Another preferred embodiment of the electrically driven hydraulic pump actuator is characterized in that a rotor of the electric motor drive is arranged in the housing body on the drive shaft between the fixed bearing and the floating bearing. This creates a stable bearing for the electric motor drive of the hydraulic pump actuator. The rotor is rotatably arranged within a stator of an electric motor in a manner known per se, and the stator, together with the rotor, forms an electric motor.

[0012] Another preferred embodiment of the electrically driven hydraulic pump actuator is characterized in that an end of the drive shaft, projecting from the housing body through the intermediate plate into the other housing body, drives a hydraulic pump in the other housing body. The hydraulic pump serves to provide hydraulic pressure. Thus, the electrically driven hydraulic pump actuator can advantageously be used, for example, in a transmission control and / or clutch control system. Another preferred embodiment of the electrically driven hydraulic pump actuator is characterized in that the housing body is made of a housing material that has a significantly different coefficient of thermal expansion than the shaft material from which the drive shaft is made. The drive shaft is, for example, made of steel.The housing body is made of an aluminum material, for example. By using the intermediate plate described above to secure the bearing assembly, the otherwise necessary increased bearing clearance during installation of the bearing assembly can be avoided. This reduces manufacturing costs.

[0013] Another preferred embodiment of the electrically driven hydraulic pump actuator is characterized in that the hydraulic pump in the other housing body is designed as an external gear pump. The external gear pump comprises, in a manner known per se, a pump chamber in which two pump wheels mesh with each other.

[0014] Another preferred embodiment of the electrically driven hydraulic pump actuator is characterized in that the bearing assembly is designed as a rolling bearing with an outer ring against which the intermediate plate is axially preloaded with its preload area. Both the fixed bearing and the floating bearing are preferably designed as rolling bearings. The intermediate plate is axially preloaded with its preload area against the outer ring of the fixed bearing. This advantageously eliminates the need for a retaining ring for axially securing the fixed bearing.

[0015] The invention further relates to an intermediate plate for a previously described electrically driven hydraulic pump actuator. The intermediate plate is available separately.

[0016] Further advantages, features and details of the invention will become apparent from the following description, in which various exemplary embodiments are described in detail with reference to the drawing. Figure 1 shows an electrically driven hydraulic pump actuator with two plate-like housing bodies, which are tightly connected to each other by means of an intermediate sheet, with a rotatably mounted drive shaft in longitudinal section through the drive shaft;

[0017] Figure 2 shows an enlarged section of Figure 1 with a bearing device for the drive shaft;

[0018] Figure 3 shows a sectional view of a three-layer intermediate sheet; and

[0019] Figure 4 shows a top view of the intermediate plate.

[0020] Figures 1 and 2 show a longitudinal section of an electrically driven hydraulic pump actuator 1. The electrically driven hydraulic pump actuator 1 comprises a housing 2. The housing 2 includes two plate-like housing bodies 3, 4, which are also referred to as housing plates 3, 4. Between the two housing bodies 3, 4, an intermediate plate 5 is shown, comprising the individual layers of base plate 52 and outer plates 51, 53 arranged on both sides of the base plate 52.

[0021] An electric motor 6 with a rotor 7, which is rotatable in a stator 8, is arranged in the housing body 3. The rotor 7 is mounted on a drive shaft 9. The electric motor 6 with the rotor 7 and the stator 8, together with the drive shaft 9, forms an electric motor drive 10 for the hydraulic pump actuator 1.

[0022] The drive shaft 9 is rotatably mounted in the housing body 3 by means of a fixed bearing 11 and a floating bearing 12. The rotor 7 is arranged on the drive shaft 9 between the fixed bearing 11 and the floating bearing 12.

[0023] The fixed bearing 11 and the floating bearing 12 form a bearing arrangement 15 for the drive shaft 9 in the housing body 3. On a side facing away from the intermediate plate 5, connections 17, 18 for at least one stator winding 16 of the stator 8 of the electric motor 6 are provided on the housing body 3. Channels and valves are provided in the housing body 3 (not shown in Figures 1 and 2). Therefore, the housing body 3 is also referred to as the valve plate 13. A hydraulic pump 20 is arranged in the housing body 4. Therefore, the housing body 4 is also referred to as the pump plate 14.

[0024] The drive shaft 9 projects with one end 29 into the housing body 4 to drive the hydraulic pump 20. The intermediate plate 5 includes a through-hole 19 through which the drive shaft 9 extends.

[0025] The hydraulic pump 20 is designed as an external gear pump with a gear 21 and a gear 22. The gears 21 and 22 are rotatably mounted in the housing 4, for example, via pillow block bearings. The gear 21 is non-rotatably connected to the end 29 of the drive shaft 9 by a coupling device 24. Therefore, the gear 21 is also referred to as the driven gear 21. The gear 22 is driven by the gear 21 and is therefore referred to as the driven gear 22.

[0026] The two gears 21, 22 are associated with an axial plate 23 in a manner known per se. The axial plate 23 is arranged axially between the gears 21, 22 and the intermediate plate 5. The drive shaft 9 also extends through the axial plate 23.

[0027] The two housing bodies 3 and 4 are made of aluminum. The drive shaft 9 is made of steel. The different materials of the housing bodies 3 and 4 and the drive shaft 9 have different coefficients of thermal expansion. Therefore, the intermediate plate 5 is advantageously used for bearing fixation.

[0028] The fixed bearing 11 is designed as a rolling bearing with an inner ring 25 and an outer ring 26. Rolling elements 27 are arranged between the inner ring 25 and the outer ring 26. The intermediate plate 5 includes a preload area 28 in the region of the through-hole 19, which serves to axially fix the outer ring 26 of the fixed bearing 11. The intermediate plate 5 also performs a sealing function between the two housing bodies 3, 4. For this purpose, the intermediate plate 5 consists of a base plate 52, a first outer plate 51, and a second outer plate 53. Both outer plates 51, 53 each have grooves 31, 32, which serve to seal channels in components 3, 4 adjacent to the intermediate plate 5. Additionally, a groove 33 is provided as a preload groove, which rests against the outer ring 26 of the fixed bearing 11 and clamps it against the housing body 3 and thus secures it.Furthermore, the intermediate plate includes 5 openings and / or through-holes that allow the passage of hydraulic fluid. The intermediate plate also serves to represent at least one valve function.

[0029] The intermediate plate 5 is particularly advantageously used for bearing securing of the bearing assembly 15 by means of the preload bead 33 in the second outer plate 53. This eliminates the need for an additional retaining ring.

[0030] Figure 3 shows a simplified and enlarged view of the intermediate plate 5. It can be seen that the intermediate plate 5 consists of a base plate 52, a first outer plate 51, and a second outer plate 53. The individual parts of the intermediate plate are usually pressed or crimped together, or joined in another suitable manner. Both outer plates 51 and 53 each have beads 31 and 32 projecting from their outer surfaces, which serve to seal channels in components adjacent to the intermediate plate. Finally, a fluid passage opening 54 is provided, which connects channels in the adjacent components.

[0031] Figure 4 shows an intermediate plate 5 in a top view, with the outer plate 53 on top. This outer plate has beads 31 for sealing channels in an adjacent component and is provided with the through-hole 19 through which the drive shaft 9 (not shown) extends. A prestressing bead 33 is arranged concentrically around the circumference of the through-hole 19, thus forming the prestressing area 28. It is understood that an arrangement of the prestressing bead 53 other than the concentric one is also possible, for example, circular arcs or several, preferably more than three, prestressing beads arranged radially around the through-hole 19 at uniform intervals. Furthermore, fluid passage openings 54 are provided in the intermediate plate 5 for fluidically connecting channels in the components adjacent to the intermediate plate 5 on both sides, such as housing bodies 3 and 4.Further openings, shown here without reference numerals, can serve to connect, in particular screw together, the housing bodies with an intermediate sheet metal panel and / or to center the individual components, for example by means of dowel pins.

[0032] Figures 2 and 4 show that the preload area 28 of the intermediate plate 5 includes a concentric preload bead 33, which has similar dimensions and can be manufactured in the same operation as the beads 31, 32. The preload bead 33 rests against the outer ring 26 of the fixed bearing 11 in such a way that an axial clamping force is exerted on the outer ring 26 of the fixed bearing 11 from left to right, as shown in Figures 1 and 2. On the other side, the outer ring 26 is supported in the housing body 3. The inner ring 25 is, for example, pressed onto a shoulder of the drive shaft 9.

[0033] List of reference symbols for electrically driven hydraulic pump actuators: Housing, Housing body, Housing body, Intermediate plate, First outer plate, Base plate, Second outer plate, Fluid passage opening, Electric motor, Rotor, Stator, Drive shaft, Electromotive drive, Fixed bearing, Floating bearing, Valve plate, Pump plate, Bearing assembly, Stator winding, Connection, Connection, Through hole, Hydraulic pump, Gear, Gear, Axial plate, Coupling assembly, Inner ring, Outer ring, Rolling element, Preload area, End, Bead, Bead, Preload bead

Claims

Patent claims 1. Electrically driven hydraulic pump actuator (1) with two plate-like housing bodies (3, 4) which are tightly connected to each other by means of an intermediate sheet (5) to form a housing (2) in which a drive shaft (9) is rotatably mounted, wherein the intermediate sheet (5) is constructed in three layers and consists of a base sheet (52) and a first and a second outer sheets (51, 53) each adjoining one of the two main surfaces of the base sheet (52), characterized in that a bearing arrangement (15) for the drive shaft (9) is secured in one of the housing bodies (3, 4) by means of the intermediate sheet (5).

2. Electrically driven hydraulic pump actuator according to claim 1, characterized in that the intermediate plate (5) exerts an axial clamping force on the bearing device (15) for the drive shaft (9) in the housing body (3).

3. Electrically driven hydraulic pump actuator according to claim 2, characterized in that the second outer sheet (53) of the intermediate sheet (5) comprises at least one preload area (28) which is spring-loaded against the bearing device (15) in the housing body (3).

4. Electrically driven hydraulic pump actuator according to claim 3, characterized in that the preload area (28) of the intermediate sheet (5) comprises at least one projecting preload bead (33) in the second outer sheet (53), which is formed in the circumferential area of ​​a through-hole (19) of the intermediate sheet (5), through which through-hole (19) the drive shaft (9) extends.

5. Electrically driven hydraulic pump actuator according to one of the preceding claims, characterized in that the bearing assembly- tung (15) is designed as a fixed bearing (11) which is combined in the housing body (3) with a floating bearing (12) for the drive shaft (9).

6. Electrically driven hydraulic pump actuator according to claim 5, characterized in that a rotor (7) of the electric motor drive (10) is arranged in the housing body (3) on the drive shaft (9) between the fixed bearing (11) and the floating bearing (12).

7. Electrically driven hydraulic pump actuator according to one of the preceding claims, characterized in that an end (29) of the drive shaft (9) projecting from the housing body (3) through the intermediate plate (5) into the other housing body (4) drives a hydraulic pump (20) in the other housing body (4).

8. Electrically driven hydraulic pump actuator according to one of the preceding claims, characterized in that the housing body (3) is formed from a housing material which has a significantly different thermal expansion than the shaft material from which the drive shaft (9) is formed.

9. Electrically driven hydraulic pump actuator according to one of the preceding claims, characterized in that the bearing device (15) is designed as a rolling bearing with an outer ring (26) against which the intermediate plate (5) is axially preloaded with its preload area (28).

10. Intermediate plate (5) for an electrically driven hydraulic pump actuator (1 ) according to one of the preceding claims.

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