CN117616204A

CN117616204A - Hydraulic pump

Info

Publication number: CN117616204A
Application number: CN202280046958.7A
Authority: CN
Inventors: S·马福德
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2021-06-30
Filing date: 2022-06-30
Publication date: 2024-02-27
Also published as: WO2023275313A1; DE102021206865A1

Abstract

The invention relates to a hydraulic pump (100), in particular a water pump, comprising a pump housing (110) having an axial bearing receptacle (130), comprising a bearing screw (112) and comprising a bearing (114), which is supported on the bearing screw (112), wherein a thrust piece (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 projection (400 a, 400b, 400 c) for fastening the thrust plate (200), and that the thrust plate (200) is constructed from ceramic.

Description

Hydraulic pump

Technical Field

The present invention relates to a hydraulic pump.

Background

It is known to construct hydraulic pumps, for example water pumps, by means of rotatable rotors. It is also known to arrange a thrust piece in the region of the axial bearing receptacle of the housing of such a pump, which thrust piece serves as a counterpart (gegenlaufphtner) for the movable bearing bush. Thrust plates known from the prior art are typically produced as stamped bends and generally have elastic spring elements for positive connection with the pump housing. Typically, stamped bends of this type are made of stainless steel. However, it has been demonstrated that thrust plates made of stainless steel are subject to wear, which limits the useful life of conventional pumps.

Hydraulic pumps are known in motor vehicles for charge air cooling, battery cooling, controller cooling and for other cooling cycles.

Disclosure of Invention

THE ADVANTAGES OF THE PRESENT INVENTION

The object of the invention is to provide a hydraulic pump with an increased service life. This object is achieved by a liquid pump having the features of claim 1. Preferred embodiments are given in the dependent claims.

The invention is based on a hydraulic pump, in particular a water pump, having a pump housing with a bearing bolt and having a bearing, the pump housing having an axial bearing receptacle, the bearing being supported on the bearing bolt, wherein a thrust piece is arranged between the axial bearing receptacle of the pump housing and the bearing. It is proposed that the axial bearing receptacle has at least one projection for fastening a thrust plate, and that the thrust plate is constructed from ceramic.

The thrust plate according to the invention, which is made of ceramic, can be pressed into the pump housing particularly easily by means of the projections at the axial bearing receptacles and additionally prevents corrosion from forming in a particularly advantageous manner in the case of pure application to water. Therefore, the use of an Inhibitor (Inhibitor) in this type of hydraulic pump can be omitted. In addition, ceramics have a particularly high hardness, whereby thrust plates constructed from these materials are only subjected to very little wear. By virtue of the locally plastic deformation of the projection and the contact surface, the contact surface is prevented from twisting when the rotor is started, so that additional expensive solutions for preventing rotation, for example, flattening of the ceramic bearing bolts, can be dispensed with. The thrust piece does not protrude beyond the contour of the axial bearing receptacle in the radial direction and therefore does not protrude into the flow-through region of the suction connection piece. In this way, the hydraulic power of the pump can be advantageously improved.

Advantageous developments and improvements of the features specified in the independent claims are achieved by the measures recited in the dependent claims.

According to an advantageous embodiment of the invention, the thrust plate and the axial bearing receptacle have a central through opening, through which the bearing bolt extends in the axial direction. Preferably, the central through opening has substantially the same diameter as the central opening of the axial bearing accommodation. Preferably, the bearing bolt protrudes through the through opening into the dome of the axial bearing receptacle.

An advantageous embodiment of the invention provides that the axial bearing receptacle has an end face. Preferably, the axial bearing receptacle is suspended in the pump housing via a tab. Preferably, the axial bearing receptacle is arranged in the suction connection of the pump housing. Particularly preferably, the axial bearing receptacle is arranged centrally in the suction connection piece. Preferably, the axial bearing receptacle has a planar end face. Preferably, the axial bearing receptacle is constructed as an injection-molded part made of plastic. Preferably, the end face has a circular contour.

In an advantageous embodiment of the invention, the end face of the axial bearing receptacle has a substantially planar bottom face, wherein the at least one projection extends in the axial direction from the bottom face of the end face. In this way, the thrust plate can lie on the floor surface in a particularly rollover-proof manner over a large area, so that bearing tolerances can be particularly advantageously complied with. The at least one projection protrudes beyond the plane of the bottom surface in the axial direction, wherein the projection is accommodated completely through the recess in the thrust plate and does not protrude beyond the contour of the thrust plate.

In an advantageous embodiment of the invention, the at least one projection of the axial bearing receptacle is configured in an arcuate manner and is preferably arranged radially inside, in particular flush with the through-opening. Preferably, the projections are dimensioned such that, when the pump housing is assembled, they are minimally elastically deformed inwardly into the through opening. Thus, a force-locking connection is produced between the axial bearing receptacle of the pump housing and the thrust plate. The shearing forces exerted by the rotor on the thrust plate when the rotor starts to operate can be absorbed particularly advantageously by the force-locking connection between the thrust plate and the projection, and thus torsion of the thrust plate can be prevented advantageously. Due to the circular arc shape of the projections, these projections can advantageously provide receptacles for bearing bolts.

An advantageous embodiment of the invention provides that the axial bearing receptacle has at least two, in particular at least three, projections which are arranged in a particularly evenly distributed manner on the circumference. Preferably, all projections are configured congruently, in particular coincident, with one another.

Preferably, the thrust plate has a receiving portion, in particular a substantially annular groove, for receiving the at least one projection. Preferably, the receptacle is arranged radially inwardly at the thrust plate. Preferably, the receptacle adjoins the through opening. Preferably, the receptacle corresponds substantially in height and/or width and/or contour to the height or width or contour of the projection. Preferably, the thrust plate is constructed in such a way that it is pressed by means of the projection.

In an advantageous embodiment of the invention, the thrust plate is located against the bottom surface of the end face of the axial bearing receptacle and substantially covers the projection at least partially, preferably completely, in the radial direction. Preferably, the circumferential collar is located with its cover surface flat on the bottom surface of the end face of the axial bearing receptacle. In this way, the forces of the bearing part can be transmitted in an optimal manner into the axial bearing receptacle and can be set with tolerance accuracy.

In an advantageous embodiment of the invention, the thrust plate has a circumferential flange which extends substantially in the axial direction, wherein the flange forms the receptacle. Preferably, both the cover surface of the circumferential collar and the end-side bottom surface of the axial bearing receptacle extend substantially flat in the axial direction. Preferably, the thrust plate bears at least 50%, preferably 60%, particularly preferably essentially 70% in contact with the bottom face of the end face of the axial bearing receptacle. Preferably, the circumferential flange is arranged entirely along the circumference. In the assembled state, the encircling flange extends substantially in the axial direction. In the region of the circumferential flange, the thrust piece has a greater height than in the region of the receptacle. Thus, the thrust plate has a step formed by the encircling flange. Preferably, the circumferential flange is arranged radially outside. Preferably, the circumferential flange is flush with the end face of the axial bearing receptacle in the radial direction. Preferably, the end face of the axial bearing receptacle is of substantially annular design. Preferably, the outer diameter of the circumferential flange corresponds substantially to the outer diameter of the end face of the axial bearing receptacle. This type of thrust plate has the following advantages: the thrust plate can be particularly easy to assemble and at the same time can advantageously reduce undesired flow effects in the suction connection of the pump.

According to a particularly preferred embodiment of the invention, the circumferential flange has a press-in surface for contacting the at least one projection. Preferably, the press-in surface is arranged on the radially inner wall of the circumferential flange. According to a preferred embodiment of the invention, the pressing surface extends over the entire circumference of the circumferential collar. However, it is also conceivable for the pressing surfaces to be arranged only in sections distributed over the circumference. A particularly preferred embodiment of the invention provides that the pressing surface is configured as a structured surface. A particularly preferred embodiment of the invention provides that the pressing surfaces are configured in a corrugated and/or groove-shaped manner. However, other surface structures, such as defined grid structures, can also be considered. Preferably, the pressing surface has a groove. It is particularly preferred that the grooves extend substantially in the axial direction. Structured surfaces, in particular grooves on the surface, lead to plastic deformations on the contact surface facing away. The material creeps (kriechen) when the thrust plate is pressed and forms a positive connection which faces.

According to a further advantageous embodiment of the invention, the circumferential flange has an insertion bevel for the insertion of the projection. The insertion bevel is arranged at the radially inner edge of the circumferential collar. By means of the lead-in chamfer, the projection can be pressed into the thrust piece.

According to an advantageous embodiment of the invention, the projection is formed integrally with the axial bearing receptacle. Preferably, the projection is configured as a resilient spring tongue made of plastic.

According to a particularly preferred embodiment of the invention, a spring plate is arranged between the axial bearing receptacle and the thrust plate. Advantageously, tolerances and corner accuracy (winkelengenauisg key) of the bearing surface of the axial bearing receptacle can be compensated for by the spring plate. This advantageously allows the thrust plate to be constructed from ceramic. Thereby, the service life of the hydraulic pump is advantageously increased. Expediently, the elastic sheet is constructed as a rubber pad. The elastic piece, which is configured as a rubber pad, advantageously has an advantageous elastic behavior and can compensate for manufacturing tolerances in the region of the axial bearing receptacle of the pump housing of the hydraulic pump.

Drawings

The invention will now be described in more detail with reference to the accompanying drawings. Here, it is shown that:

figure 1 is a cross-section of a pump housing of a water pump according to a first embodiment,

figure 2a is a schematic perspective view of a pump housing part,

the enlarged segment in figure 2 b-figure 2a,

figure 3a is a schematic perspective view of a thrust plate according to one embodiment,

the enlarged segment in figure 3 b-3 a,

fig. 4 is an enlarged view of the axial bearing receptacle with the thrust plate assembled.

Detailed Description

Fig. 1 shows a cross section of a part of a pump housing 110 of a hydraulic pump 100. For example, the hydraulic pump 100 can be provided for pumping water. For example, the hydraulic pump 100 can be used as an additional water pump in a motor vehicle. As a make-up water pump, the hydraulic pump 100 can be used to cool charge air, a battery of a controller, or other components of the motor vehicle.

The pump housing 110 has an axial bearing receptacle 130, which is provided for receiving a bearing bolt, which is not shown in fig. 1. Then, the axial bolt extends into the axial bearing receptacle 130 in the axial direction 140. A bearing, for example a bearing bush, is supported on the bearing bolt, around which the bearing rotates during operation of the hydraulic pump 100. The axial bearing receptacle 130 has an end face 131 which is oriented in the direction of the rotating bearing. In order to avoid wear of the end face 131 of the axial bearing receptacle 130, a thrust plate 200 is arranged between the end face 131 and the bearing. A particularly advantageous embodiment provides that a spring plate 300 is arranged between the axial bearing insert 130 and the first thrust plate 200, which spring plate serves to compensate for manufacturing-related tolerances of the corners (winkeligkey) of the bearing surface 131 of the axial bearing insert 130 of the pump housing 110. Preferably, the elastic sheet 300 is also substantially circular in sheet-like configuration.

Fig. 2a shows a perspective view of a part of the pump housing 110 of the hydraulic pump 100 in the region of the axial bearing receptacle 130 before the thrust plate is assembled. The axial bearing housing 130 of the pump housing 110 of the hydraulic pump 100 has a first projection 400a, a second projection 400b, and a third projection 400c. Fig. 2b shows an enlarged fragment of fig. 2 a. The projections 400a, 400b, 400c are firmly connected with the axial bearing housing 130. In the assembled state, the projections 400a, 400b, 400c engage into the receptacles 260 of the thrust plate 200. Fewer than three projections 400a, 400b, 400c or a greater number of projections 400a, 400b, 400c can also be provided. As best shown in fig. 2, the end face 131 of the axial bearing receiver 130 has a substantially planar bottom surface 132. The bottom surface 132 extends in a substantially radial direction. The projections 400a, 400b, 400c extend from the bottom surface 132, i.e. they extend beyond the bottom surface 132 in the axial direction 140. The projections 400a, 400b, 400c have axial heights 410a, 410b, 410c, respectively, relative to the bottom surface 132. In the assembled state, the thrust plate 200, together with the circumferential flange 250, lies essentially free of play on the bottom surface 132.

According to the embodiment of the invention shown in fig. 2b, the projections 400a, 400b, 400c are arranged equidistant from each other at the inner periphery of the end face. The projections 400a, 400b, 400c extend substantially along the axial direction 140. According to the embodiment of the invention shown in fig. 2a, the projections 400a, 400b, 400c are embodied in the shape of circular segments. The radius of the arcuate projections 400a, 400b, 400c preferably corresponds here to the diameter of the central through opening 210 of the substantially annular axial bearing receptacle 130. Preferably, the projections 400a, 400b, 400c are radially flush with the axial bearing housing 130.

The axial bearing receptacle 130 is connected to the pump housing 110 via webs 500a, 500b, 500c. Tabs 500a, 500b, 500c pass through the flow-through region of the pump in radial and axial directions. The webs are preferably formed as injection molded parts and are preferably arranged in one piece on the pump housing 110. The webs 500a, 500b, 500c are preferably arranged equidistantly at the axial bearing receptacle 130. According to the embodiment of the invention shown in fig. 2, three webs 500a, 500b, 500c are provided. According to a particularly preferred embodiment of the invention, the projections 400a, 400b, 400c are arranged in the circumferential direction in the region of the webs 500a, 500b, 500c. It is also conceivable for the projections 400a, 400b, 400c to be arranged radially outwardly on the end face 131 of the axial bearing receptacle 130, in particular in the extension of the webs 500a, 500b, 500c. The projections 400a, 400b, 400c preferably cover between 20 ° and 40 ° of the circumference.

Fig. 3a shows a schematic perspective view of a thrust plate 200. The thrust plate 200 is essentially of annular disk-shaped design or is of short hollow cylinder design. Thus, the thrust plate 200 has a generally annular first facing 220 and a second facing 230 opposite the first facing 220. The second facing surface 230 corresponds to the thrust surface 201. The outer periphery of the thrust plate 200 is formed by an outer side surface 240. Centered about the axis of the thrust plate 200, the thrust plate 200 has a through opening 210 in the center. The through-opening 210 is preferably configured as a through-drilled hole. The thrust plate 200 is constructed of a ceramic material.

The thrust plate 200 has a surrounding flange 250. The circumferential flange 250 is arranged radially outwardly at the periphery of the thrust plate 200. The radially outer wall of the encircling flange 250 is configured as part of the outer side surface 240. The circumferential flange 250 protrudes beyond the face of the thrust plate 200 in the axial direction 140. The surrounding flange 250 surrounds the receptacle 260. According to the embodiment of the invention shown in fig. 3a, the receptacle 260 is arranged radially inward at the thrust plate 200 and comprises a through opening 210. Thus, the thrust plate 200 has a substantially annular shape with steps located radially inward.

In the assembled state, the projections 400a, 400b, 400c are located in the receiving portion 260. Preferably, the projections 400a, 400b, 400c are dimensioned such that they are minimally elastically deformed inwardly into the through opening 210 when the pump housing is assembled. Thus, a force-locking connection is produced between the axial bearing receptacle 130 of the pump housing 110 and the thrust plate 200. The shearing forces exerted by the rotor on the thrust plate 200 are thus located significantly below the force-locking connection between the pump housing 110 and the thrust plate 200, so that a torsion of the thrust plate can advantageously be prevented.

The surrounding flange 250 has a press-in surface 270. The press-in surface 270 is the inner surface of the encircling flange 250 facing the bearing bolt. According to the embodiment of the invention shown in fig. 3a, the press-in surface 270 is structured. Fig. 3b shows an enlarged fragment of fig. 3 b. As shown in fig. 3b, the press-in surface 270 has grooves 280. The groove 280 has a plurality of grooves 290. Preferably, the corrugations 280 have a number of grooves 290 in the circumferential direction that is greater than 360. Preferably, the grooves 290 of the grooves 280 extend in the axial direction 140, so that the thrust plate 200 can be assembled particularly easily and at the same time can prevent the thrust plate 200 from twisting in the circumferential direction due to corresponding shearing forces when the rotor starts to run. It is also conceivable that the press-in surface 270 is structured only in sections. It is also conceivable for the projections 400a, 400b, 400c to additionally or alternatively have corresponding structuring. Structured surfaces, in particular grooves 280 at the surface, lead to plastic deformations at the contact surface facing towards each other. The material creeps during the pressing of the thrust plate and forms a positive connection that faces.

According to the embodiment of the invention shown in fig. 3a, the circumferential flange 250 has a lead-in bevel 310 at its radially inner circumferential edge. The introduction slope 310 can introduce the protruding portions 400a, 400b, 400c into the accommodating portion 260. The receptacle 260 is substantially annular in shape. Preferably, the receiving portion 260 has an axial height 320 that substantially corresponds to the axial heights 410a, 410b, 410c of the projections 400a, 400b, 400c. Preferably, the lead-in chamfer 310 has an angle of between 60 ° and 30 °, preferably between 50 and 40, particularly preferably 45 °.

Fig. 4 shows a fragment of a pump housing with an assembled thrust plate 200. According to the embodiment of the invention shown in fig. 5, the outer side surface 240 of the thrust plate 200 is radially flush with the end face 131 of the axial bearing receptacle 130. Thus, the outer diameter of the thrust plate 200 substantially corresponds to the outer diameter of the end face 131 of the axial bearing receptacle 130. Preferably, the diameter of the central through opening 210 of the thrust plate 200 substantially corresponds to the diameter of the through opening 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 outer diameter of the bearing bolt. Thus, 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 radially overlaps the projections 400a, 400b, 400c. The thrust plate 200 is formed substantially flat on the thrust surface 201 facing away from the receptacle 260.

Claims

1. Hydraulic pump (100), in particular a water pump, having a pump housing (110) with a bearing screw (112) and having a bearing (114) with an axial bearing receptacle (130) which is supported on the bearing screw (112), wherein a thrust piece (200) is arranged between the axial bearing receptacle (130) of the pump housing (110) and the bearing (114), characterized in that the axial bearing receptacle (130) has at least one projection (400 a, 400b, 400 c) for fastening the thrust piece (200), and in that the thrust piece (200) is constructed from ceramic.

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

3. The hydraulic pump (100) according to any one of the preceding claims, characterized in that the axial bearing receptacle (130) has an end face (131), wherein the end face (131) extends substantially in a radial direction and is preferably configured in the shape of a ring.

4. The hydraulic pump (100) according to any one of the preceding claims, wherein the end face (131) of the axial bearing receptacle (130) has a substantially flat bottom face (132), wherein the at least one projection (400 a, 400b, 400 c) extends from the bottom face (132) of the end face (131) in the axial direction (140).

5. The hydraulic pump (100) according to any one of the preceding claims, characterized in that at least one projection (400 a, 400b, 400 c) of the axial bearing receptacle (130) is configured arcuately and is preferably arranged radially inwardly, in particular flush with the through opening (210).

6. The hydraulic pump (100) according to any one of the preceding claims, characterized in that the axial bearing receptacle (130) has at least two, in particular at least three, projections (400 a, 400b, 400 c), which are arranged in particular uniformly distributed at the periphery.

7. The hydraulic pump (100) according to any one of the preceding claims, characterized in that the thrust plate (200) has a receptacle (260) for the at least one projection (400 a, 400b, 400 c).

8. The hydraulic pump (100) according to any of the preceding claims, characterized in that the thrust plate (200) is pressed by means of the projections (400 a, 400b, 400 c).

9. The hydraulic pump (100) according to any of the preceding claims, characterized in that the thrust plate (200) abuts at a bottom surface (132) of an end surface (131) of the axial bearing receptacle (130) and substantially covers the projections (400 a, 400b, 400 c) at least partially, preferably completely, in the radial direction.

10. The hydraulic pump (100) according to any one of the preceding claims, characterized in that the thrust plate (200) has a circumferential flange (250) which extends substantially in the axial direction, wherein the flange (250) is configured for the accommodation (260) of the projection (400 a, 400b, 400 c).

11. The hydraulic pump (100) according to any one of the preceding claims, characterized in that the circumferential flange (250) has a press-in surface (270) for contacting the at least one projection (400 a, 400b, 400 c), wherein preferably the press-in surface (270) is at least partially configured as a structured, in particular grooved, surface (280, 290).

12. The hydraulic pump (100) according to any of the preceding claims, characterized in that the surrounding flange (250) has an introduction slope (310) for introducing the projections (400 a, 400b, 400 c).

13. The hydraulic pump (100) according to any one of the preceding claims, wherein the projections (400 a, 400b, 400 c) are integrally constructed with the axial bearing receptacle (130), and wherein preferably the thrust plate (200) abuts substantially without play, preferably tightly, at the axial bearing receptacle (130).

14. The hydraulic pump (100) according to any one of the preceding claims, characterized in that an elastic sheet (300) is arranged between the axial bearing accommodation (130) and the thrust sheet (200), wherein the elastic sheet (300) is preferably configured as a rubber pad.