Hydraulic pump

Abstract

The invention relates to a hydraulic pump (100), in particular a water pump, having a pump housing (110) having a bearing bolt (112) and having a bearing (114), the pump housing having an axial bearing receptacle (130), the bearing being supported on the bearing bolt (112), wherein a thrust plate (200) is arranged between the axial bearing receptacle (130) of the pump housing (110) and the bearing (114). It is proposed that the axial bearing receptacle (130) has at least one protrusion (400a, 400b, 400c) for fastening the thrust plate (200) and that the thrust plate (200) is constructed from ceramic.

Description

Technical Field

[0001] This invention relates to a hydraulic pump. Background Technology

[0002] Hydraulic pumps, such as water pumps, are known to be constructed using a rotatable rotor. It is also known that thrust washers are arranged in the axial bearing housing region of such pump housings, serving as mating parts for movable bearing bushings. Thrust washers known in the prior art are typically manufactured as stamped bends and usually have an elastic spring element for locking into the shape of the pump housing. Typically, this type of stamped bend is made of stainless steel. However, it has been shown that thrust washers made of stainless steel are susceptible to wear, which limits the service life of conventional pumps.

[0003] Hydraulic pumps are known to be used in motor vehicles for pressurized air cooling, battery cooling, controller cooling, and other cooling cycles. Summary of the Invention

[0004] Advantages of the present invention

[0005] The objective of this invention is to provide a hydraulic pump with an increased service life. This objective is achieved by a liquid pump having the features of claim 1. Preferred extensions are given in the dependent claims.

[0006] This invention relates to a hydraulic pump, particularly a water pump, having a pump housing, bearing bolts, and a bearing. The pump housing has an axial bearing housing, and the bearing is supported on the bearing bolts. A thrust washer is arranged between the axial bearing housing and the bearing. The axial bearing housing has at least one protrusion for securing the thrust washer, and the thrust washer is made of ceramic.

[0007] The ceramic thrust washer according to the invention can be pressed into the pump housing particularly easily by means of a protrusion at the axial bearing housing, and additionally, in a particularly advantageous manner, prevents corrosion in pure water applications. Therefore, the use of an inhibitor in this type of hydraulic pump can be eliminated. Furthermore, ceramic has particularly high hardness, thus the thrust washer constructed from these materials experiences very little wear. The localized plastic deformation faced by the protrusion and the thrust washer, with particularly simple means, prevents the torsion of the thrust washer at the start of rotor operation, eliminating the need for additional, expensive anti-rotation solutions, such as flattening the ceramic bearing bolts. The thrust washer does not protrude radially beyond the contour of the axial bearing housing, and therefore does not extend into the flow area of ​​the suction pipe. In this way, the hydraulic power of the pump can be advantageously improved.

[0008] Advantageous extensions and improvements to the features given in the independent claim are obtained by means of measures enumerated in the dependent claims.

[0009] According to an advantageous extension of the invention, the thrust washer and axial bearing housing have a central through opening through which a bearing bolt extends axially. Preferably, the central through opening has substantially the same diameter as the central opening of the axial bearing housing. Preferably, the bearing bolt extends through the through opening into the dome of the axial bearing housing.

[0010] In an advantageous extension of the invention, the axial bearing housing has an end face. Preferably, the axial bearing housing is suspended in the pump housing via a tab. Preferably, the axial bearing housing is arranged in the suction port of the pump housing. Particularly preferably, the axial bearing housing is centrally located at the center of the suction port. Preferably, the axial bearing housing has a flat end face. Preferably, the axial bearing housing is constructed as an injection-molded part made of plastic. Preferably, the end face has an annular profile.

[0011] In an advantageous embodiment of the invention, the end face of the axial bearing housing has a substantially flat bottom surface, wherein at least one protrusion extends axially from the bottom surface of the end face. In this way, the thrust washer can be laid flat on the bottom surface with a large area, particularly preventing tipping, thus enabling particularly advantageous compliance with bearing tolerances. At least one protrusion extends axially beyond the plane of the bottom surface, wherein the protrusion is completely received within the thrust washer by a recess and does not extend beyond the contour of the thrust washer.

[0012] In an advantageous extension of the invention, at least one protrusion of the axial bearing housing is constructed in an arcuate shape and is preferably arranged radially inward, particularly flush with the through opening. Preferably, the protrusion is sized such that it elastically deforms inward into the through opening to a minimum during pump housing assembly. This creates a force-locking connection between the axial bearing housing and the thrust plate in the pump housing. The shear force exerted on the thrust plate by the rotor during rotor start-up is particularly advantageously absorbed by the force-locking connection between the thrust plate and the protrusion, and thus advantageously prevents torsion of the thrust plate. Due to the arcuate shape of the protrusion, it advantageously provides a receiving portion for the bearing bolts.

[0013] An advantageous extension of the invention provides that the axial bearing housing has at least two, and particularly at least three, protrusions, which are arranged particularly evenly around the periphery. Preferably, all the protrusions are constructed to be congruent to each other, and particularly to overlap.

[0014] Preferably, the thrust plate has a receiving portion, particularly a substantially annular groove, for receiving the at least one protrusion. Preferably, the receiving portion is arranged radially inward at the thrust plate. Preferably, the receiving portion is adjacent to a through opening. Preferably, the receiving portion substantially corresponds in height and / or width and / or profile to the height or width or profile of the protrusion. Preferably, the thrust plate is constructed by means of compression by means of the protrusion.

[0015] In an advantageous extension of the invention, the thrust plate rests against the bottom surface of the end face of the axial bearing housing, and the thrust plate substantially, at least partially, and preferably completely, covers the protrusion radially. Preferably, the surrounding flange lies flat on the bottom surface of the end side of the axial bearing housing by means of its cover surface. In this way, the force of the bearing portion can be optimally transmitted to the axial bearing housing, and the bearing portion can be adjusted with tolerance precision.

[0016] In an advantageous extension of the invention, the thrust plate has a surrounding flange extending substantially axially, wherein the flange constitutes the receiving portion. Preferably, not only the cover surface of the surrounding flange but also the bottom surface of the end face of the axial bearing receiving portion extends substantially flat axially. Preferably, the thrust plate abuts against the bottom surface of the end face of the axial bearing receiving portion at least 50%, preferably 60%, particularly preferably substantially 70% in contact. Preferably, the surrounding flange is arranged entirely along the periphery. In the assembled state, the surrounding flange extends substantially axially. In the region of the surrounding flange, the thrust plate has a greater height than in the region of the receiving portion. Therefore, the thrust plate has steps formed by the surrounding flange. Preferably, the surrounding flange is arranged radially outward. Preferably, the surrounding flange is flush with the end face of the axial bearing receiving portion radially. Preferably, the end face of the axial bearing receiving portion is substantially annularly constructed. Preferably, the outer diameter of the surrounding flange substantially corresponds to the outer diameter of the end face of the axial bearing receiving portion. This type of thrust washer has the following advantages: it is particularly easy to assemble and at the same time can advantageously reduce undesirable flow effects in the pump's suction line.

[0017] According to a particularly preferred embodiment of the invention, the surrounding flange has a press-fit surface for contacting at least one protrusion. Preferably, the press-fit surface is arranged on the radially inward inner wall of the surrounding flange. According to a preferred extension of the invention, the press-fit surface extends over the entire periphery of the surrounding flange. However, it is also conceivable that the press-fit surface is arranged only sectionally on the periphery. According to a particularly preferred embodiment of the invention, the press-fit surface is configured as a structured surface. According to a particularly preferred embodiment of the invention, the press-fit surface is corrugated and / or grooved. However, other surface structures, such as defined grid structures, are also conceivable. Preferably, the press-fit surface has grooves. Particularly preferably, the grooves extend substantially in the axial direction. The structured surface, especially the grooves at the surface, leads to plastic deformation at the contact surface of the action surfaces. The material creeps when the thrust plate is compressed, and a shape-locking connection is formed between the action surfaces.

[0018] According to another advantageous extension of the invention, the surrounding flange has a guide ramp for guiding the protrusion. This guide ramp is located at a radially inward edge of the surrounding flange. This guide ramp allows the protrusion to be pressed into the thrust plate.

[0019] According to an advantageous extension of the invention, the protrusion is integrally constructed with the axial bearing receiving portion. Preferably, the protrusion is constructed as a resilient spring tongue made of plastic.

[0020] According to a particularly preferred embodiment of the invention, an elastic sheet is arranged between the axial bearing housing and the thrust plate. Advantageously, this elastic sheet can compensate for tolerances and corner precision of the support surface of the axial bearing housing. This advantageously allows the thrust plate to be constructed of ceramic. Consequently, the service life of the hydraulic pump is advantageously increased. For this purpose, the elastic sheet is constructed as a rubber pad. Advantageously, the elastic sheet constructed as a rubber pad has advantageous elastic properties and can compensate for manufacturing tolerances in the area of ​​the axial bearing housing of the hydraulic pump housing. Attached Figure Description

[0021] The invention will now be described in more detail with reference to the accompanying drawings. As shown herein:

[0022] Figure 1 A cross-section of the pump casing according to the first embodiment of the water pump,

[0023] Figure 2a Perspective view of pump housing components.

[0024] Figure 2b Figure 2a The enlarged segment in the video,

[0025] Figure 3a A perspective view of a thrust plate according to one embodiment,

[0026] Figure 3b Figure 3a The enlarged segment in the video,

[0027] Figure 4 An enlarged view of the axial bearing housing with assembled thrust plates. Detailed Implementation

[0028] Figure 1 A cross-section of a portion of the pump housing 110 of the hydraulic pump 100 is shown. For example, the hydraulic pump 100 can be configured to pump water. For example, the hydraulic pump 100 can be used as an auxiliary water pump in a motor vehicle. As a supplementary water pump, the hydraulic pump 100 can be used to cool booster air, the controller's battery, or other components of the motor vehicle.

[0029] Pump housing 110 has an axial bearing housing 130, which is configured to accommodate... Figure 1 The bearing bolt is not shown. This axial bolt then extends axially 140 into the axial bearing housing 130. A bearing, such as a bearing bushing, is supported on the bearing bolt and rotates about the bearing bolt during operation of the hydraulic pump 100. The axial bearing housing 130 has an end face 131 oriented in the direction of the rotating bearing. To prevent wear on the end face 131 of the axial bearing housing 130, a thrust washer 200 is arranged between the end face 131 and the bearing. A particularly advantageous extension is provided with an elastic plate 300 arranged between the axial bearing housing 130 and the first thrust washer 200, which compensates for manufacturing tolerances at the corner of the support surface 131 of the axial bearing housing 130 of the pump housing 110. Preferably, the elastic plate 300 is also constructed substantially in annular shape.

[0030] Figure 2a This is a perspective view of a portion of the pump housing 110 of the hydraulic pump 100 in the region of the axial bearing housing 130 before the thrust washer is assembled. The axial bearing housing 130 of the pump housing 110 of the hydraulic pump 100 has a first protrusion 400a, a second protrusion 400b, and a third protrusion 400c. Figure 2b Show Figure 2aThe enlarged section is shown in Figure 2. Protrusions 400a, 400b, and 400c are securely connected to the axial bearing housing 130. In the assembled state, protrusions 400a, 400b, and 400c engage with the housing 260 of the thrust plate 200. It is also possible to provide fewer than three protrusions 400a, 400b, and 400c, or a larger number of protrusions 400a, 400b, and 400c. As clearly shown in Figure 2, the end face 131 of the axial bearing housing 130 has a substantially flat bottom surface 132. The bottom surface 132 extends substantially in the radial direction. Protrusions 400a, 400b, and 400c extend from the bottom surface 132, i.e., the protrusions extend beyond the bottom surface 132 in the axial direction 140. The protrusions 400a, 400b, and 400c have axial heights 410a, 410b, and 410c, respectively, relative to the bottom surface 132. In the assembled state, the thrust plate 200 and the surrounding flange 250 lie flat on the bottom surface 132 with virtually no gap.

[0031] According to the present invention Figure 2b In the embodiment shown, protrusions 400a, 400b, and 400c are arranged equidistantly from each other at the inner periphery of the end face. Protrusions 400a, 400b, and 400c extend substantially along the axial direction 140. According to the invention... Figure 2a In the embodiment shown, the protrusions 400a, 400b, and 400c are constructed in an arcuate shape. The radius of the arcuate protrusions 400a, 400b, and 400c preferably corresponds to the diameter of the central through opening 210 of the substantially annular axial bearing housing 130. Preferably, the protrusions 400a, 400b, and 400c are radially flush with the axial bearing housing 130.

[0032] The axial bearing housing 130 is connected to the pump housing 110 via tabs 500a, 500b, and 500c. Tabs 500a, 500b, and 500c pass through the flow area of ​​the pump in both the radial and axial directions. The tabs are preferably injection-molded and are preferably arranged as a single piece in the pump housing 110. Tabs 500a, 500b, and 500c are preferably arranged equidistantly in the axial bearing housing 130. According to the embodiment shown in FIG. 2 of the invention, three tabs 500a, 500b, and 500c are provided. According to a particularly preferred embodiment of the invention, protrusions 400a, 400b, and 400c are arranged circumferentially in the region of tabs 500a, 500b, and 500c. Alternatively, protrusions 400a, 400b, and 400c may be arranged radially outward at the end face 131 of the axial bearing receiving portion 130, particularly in the extensions of the tabs 500a, 500b, and 500c. Protrusions 400a, 400b, and 400c preferably cover the area between 20° and 40° of the periphery.

[0033] Figure 3a A perspective view of the thrust plate 200 is shown. The thrust plate 200 is constructed in a substantially annular disc shape, or rather, as a short hollow cylinder. Therefore, the thrust plate 200 has a generally annular first cover surface 220 and a second cover surface 230 opposite to the first cover surface 220. The second cover surface 230 corresponds to the thrust surface 201. The outer periphery of the thrust plate 200 is formed by an outer surface 240. The thrust plate 200 has a central through opening 210 about its axis. The through opening 210 is preferably constructed as a through bore. The thrust plate 200 is constructed of a ceramic material.

[0034] The thrust plate 200 has a surrounding flange 250. This surrounding flange 250 is arranged radially outward at the periphery of the thrust plate 200. The radially outer wall of the surrounding flange 250 is constructed as part of the outer surface 240. The surrounding flange 250 protrudes beyond the face of the thrust plate 200 in the axial direction 140. The surrounding flange 250 surrounds the receiving portion 260. According to the invention... Figure 3a In the embodiment shown, the receiving portion 260 is arranged radially inward at the thrust plate 200 and includes a through opening 210. Therefore, the thrust plate 200 has a substantially annular shape with stepped sections located radially inward.

[0035] In the assembled state, protrusions 400a, 400b, and 400c are located in the receiving portion 260. Preferably, protrusions 400a, 400b, and 400c are sized such that, during pump housing assembly, these protrusions undergo minimal inward elastic deformation into the through opening 210. Therefore, a force-locked connection is created between the axial bearing receiving portion 130 of the pump housing 110 and the thrust plate 200. Consequently, the shear force exerted by the rotor on the thrust plate 200 is significantly below the force-locked connection between the pump housing 110 and the thrust plate 200, thus advantageously preventing torsion of the thrust plate.

[0036] The surrounding flange 250 has a press-in surface 270. The press-in surface 270 is the inner surface of the surrounding flange 250 facing the bearing bolt. According to the invention... Figure 3a In the embodiment shown, the press-in surface 270 is structurally constructed. Figure 3b Show Figure 3b Enlarged segments within. For example... Figure 3bAs shown, the press-fit surface 270 has grooves 280. The grooves 280 have a plurality of slots 290. Preferably, the grooves 280 have more than 360 slots 290 in the circumferential direction. Preferably, the slots 290 of the grooves 280 extend in the axial direction 140, making the thrust plate 200 particularly easy to assemble and simultaneously preventing the thrust plate 200 from twisting in the circumferential direction due to corresponding shear forces during rotor startup. It is also possible that the press-fit surface 270 is only structurally segmented. It is also possible that protrusions 400a, 400b, 400c are added here or alternatively have corresponding structural portions. The structured surface, especially the grooves 280 on the surface, causes plastic deformation at the contact surface of the action surface. The material creeps when the thrust plate is pressed, and a shape-locking connection is formed on the action surface.

[0037] According to the present invention Figure 3a In the embodiment shown, the surrounding flange 250 has an inlet ramp 310 at its radially inward, surrounding edge. The inlet ramp 310 allows the protrusions 400a, 400b, 400c to be guided into the receiving portion 260. The receiving portion 260 is substantially annularly constructed. Preferably, the receiving portion 260 has an axial height 320, which substantially corresponds to the axial heights 410a, 410b, 410c of the protrusions 400a, 400b, 400c. Preferably, the inlet ramp 310 has an angle between 60° and 30°, preferably between 50° and 40°, and particularly preferably 45°.

[0038] Figure 4 A segment of a pump housing with an assembled thrust plate 200 is shown. According to the embodiment shown in FIG. 5 of the invention, the outer surface 240 of the thrust plate 200 is radially flush with the end face 131 of the axial bearing housing 130. Therefore, the outer diameter of the thrust plate 200 substantially corresponds to the outer diameter of the end face 131 of the axial bearing housing 130. Preferably, the diameter of the central through opening 210 of the thrust plate 200 substantially corresponds to the diameter of the through opening on the end face 131 of the axial bearing housing 130. Preferably, the diameter of the central through opening 210 of the thrust plate 200 substantially corresponds to the outer diameter of the bearing bolt. Therefore, the thrust plate 200 completely covers the end face 131 of the axial bearing housing 130. As shown in FIG. 5, the thrust plate 200 overlaps the protrusions 400a, 400b, and 400c radially. The thrust plate 200 is constructed substantially flat on the thrust surface 201 opposite to the housing 260.

Claims

1. A hydraulic pump (100) having a pump housing (110), bearing bolts (112), and a bearing (114), the pump housing having an axial bearing housing (130), the bearing being supported on the bearing bolts (112), wherein, A thrust plate (200) is arranged between the axial bearing housing (130) of the pump housing (110) and the bearing (114), characterized in that the axial bearing housing (130) has at least one protrusion (400a, 400b, 400c) for fastening the thrust plate (200), and the thrust plate (200) is made of ceramic, wherein the thrust plate (200) has a surrounding flange (250) extending substantially in the axial direction, wherein the flange (250) is configured to accommodate the protrusion (400a, 400b, 400c) (260), and wherein the surrounding flange (250) has a press-fit surface (270) for contacting the at least one protrusion (400a, 400b, 400c).

2. The hydraulic pump (100) according to claim 1, characterized in that, The hydraulic pump (100) is a water pump.

3. The hydraulic pump (100) according to claim 1, characterized in that, The thrust plate (200) and the axial bearing housing (130) have a central through opening (210), through which the bearing bolt (112) extends in the axial direction (140) through the central through opening (210).

4. The hydraulic pump (100) according to any one of claims 1 to 3, characterized in that, The axial bearing housing (130) has an end face (131) which extends substantially in the radial direction.

5. The hydraulic pump (100) according to claim 4, characterized in that, The end face (131) is circularly annular.

6. The hydraulic pump (100) according to any one of claims 1 to 3, characterized in that, The end face (131) of the axial bearing housing (130) has a substantially flat bottom surface (132), wherein at least one protrusion (400a, 400b, 400c) extends from the bottom surface (132) of the end face (131) in the axial direction (140).

7. The hydraulic pump (100) according to claim 3, characterized in that, At least one protrusion (400a, 400b, 400c) of the axial bearing housing (130) is constructed in an arcuate shape.

8. The hydraulic pump (100) according to claim 7, characterized in that, At least one protrusion (400a, 400b, 400c) of the axial bearing housing (130) is arranged radially inward.

9. The hydraulic pump (100) according to claim 8, characterized in that, At least one protrusion (400a, 400b, 400c) of the axial bearing housing (130) is arranged flush with the central through opening (210).

10. The hydraulic pump (100) according to any one of claims 1 to 3, characterized in that, The axial bearing housing (130) has at least two protrusions (400a, 400b, 400c) arranged at the periphery.

11. The hydraulic pump (100) according to claim 10, characterized in that, The axial bearing housing (130) has at least three protrusions (400a, 400b, 400c).

12. The hydraulic pump (100) according to claim 10, characterized in that, The protrusions (400a, 400b, 400c) are evenly distributed around the perimeter.

13. The hydraulic pump (100) according to any one of claims 1 to 3, characterized in that, The thrust plate (200) has a receiving portion (260) for the at least one protrusion (400a, 400b, 400c).

14. The hydraulic pump (100) according to any one of claims 1 to 3, characterized in that, The thrust plate (200) is compressed by means of the protrusions (400a, 400b, 400c).

15. The hydraulic pump (100) according to any one of claims 1 to 3, characterized in that, The thrust plate (200) abuts against the bottom surface (132) of the end face (131) of the axial bearing housing (130) and substantially at least partially covers the protrusions (400a, 400b, 400c) in the radial direction.

16. The hydraulic pump (100) according to claim 15, characterized in that, The thrust plate (200) completely covers the protrusions (400a, 400b, 400c) in the radial direction.

17. The hydraulic pump (100) according to any one of claims 1 to 3, characterized in that, The pressed surface (270) is at least partially constructed as a structured surface (280, 290).

18. The hydraulic pump (100) according to claim 17, characterized in that, The pressed surface (270) is at least partially constructed as a grooved surface (280, 290).

19. The hydraulic pump (100) according to any one of claims 1 to 3, characterized in that, The surrounding flange (250) has an inlet ramp (310) for inleting the protrusions (400a, 400b, 400c).

20. The hydraulic pump (100) according to any one of claims 1 to 3, characterized in that, The protrusions (400a, 400b, 400c) are integrally constructed with the axial bearing receiving portion (130).

21. The hydraulic pump (100) according to claim 20, characterized in that, The thrust plate (200) rests against the axial bearing housing (130) with virtually no gap.

22. The hydraulic pump (100) according to claim 21, characterized in that, The thrust plate (200) is tightly attached to the axial bearing housing (130).

23. The hydraulic pump (100) according to any one of claims 1 to 3, characterized in that, An elastic sheet (300) is arranged between the axial bearing housing (130) and the thrust plate (200).

24. The hydraulic pump (100) according to claim 23, characterized in that, The elastic sheet (300) is constructed as a rubber pad.

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