CN118066113A - Electronic oil pump and electric drive system - Google Patents
Electronic oil pump and electric drive system Download PDFInfo
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- CN118066113A CN118066113A CN202410375820.2A CN202410375820A CN118066113A CN 118066113 A CN118066113 A CN 118066113A CN 202410375820 A CN202410375820 A CN 202410375820A CN 118066113 A CN118066113 A CN 118066113A
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- rotating shaft
- pump
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- 238000005086 pumping Methods 0.000 claims abstract description 102
- 230000001603 reducing effect Effects 0.000 claims abstract description 47
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 230000009471 action Effects 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 33
- 239000006223 plastic coating Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 11
- 238000005096 rolling process Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 abstract description 13
- 239000003921 oil Substances 0.000 description 363
- 238000012545 processing Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000010349 pulsation Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0096—Heating; Cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/50—Bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/60—Shafts
- F04C2240/603—Shafts with internal channels for fluid distribution, e.g. hollow shaft
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rotary Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The invention discloses an electronic oil pump and an electric driving system, which are characterized in that a control structure cavity, a motor structure cavity and an oil pumping structure cavity are axially and sequentially connected, an oil circulation cavity is formed in the motor structure cavity, and a rotating shaft through groove and an oil discharging channel which are communicated with the oil circulation cavity are arranged on the oil pumping structure cavity and correspond to a high-pressure area and a low-pressure area of an oil pumping cavity respectively; the rotating shaft of the motor structural cavity is positioned at two ends, the first end is positioned in the control structural cavity or the motor structural cavity, the second end is positioned in the rotating shaft through groove, the rotating shaft is in sliding connection with the rotating shaft through groove, a sliding gap between the rotating shaft and the rotating shaft is used as an oil inlet pressure reducing channel, oil in a high-pressure area can be pressed into the oil inlet pressure reducing channel under pressure and jet into the oil circulation cavity to be mixed with internal oil, and oil in the oil circulation cavity can be pumped out through an oil discharging channel under the action of low pressure in a low-pressure area to form oil circulation, so that oil circulation cooling is realized on heat in the control structural cavity and the motor structural cavity.
Description
Technical Field
The invention belongs to the technical field of oil pumps, and particularly relates to an electronic oil pump and an electric drive system.
Background
The automobile industry rapidly develops, and along with the development of automobile performance towards safer, more reliable, more stable, full-automatic intelligent and environment-friendly energy-saving directions, the electronic oil pump is widely applied to an automobile lubricating system and a cooling system, and can well meet the market requirements.
The bearings at the two ends in the electronic oil pump bear different loads, and the radial load born by one end of the oil pump assembly close to the load is larger, so that the electronic oil pump is more easily worn, and the service life of the electronic oil pump is influenced.
To this problem, current solution is for adopting slide bearing to replace antifriction bearing at both ends to bear radial load, for example, in patent CN115306730A, adopt slide bearing seat to realize the connection of rotor and oil pump subassembly, avoid a plurality of problems that oil blanket ageing and wearing and tearing brought from the source, through setting up the interior flow duct, allow oil in the pump oil process to follow oil pump subassembly region inflow motor region, oil can lubricate and heat transfer slide bearing seat, motor stator and the nearby region of controller to optimize the whole service environment of electronic oil pump, prolong the life of oil pump subassembly, promote the reliability of oil pump subassembly.
However, in this solution, the sliding bearing is provided only at one end, and is designed for a long bearing, and there are several drawbacks: 1. the rotor has poor positioning operation stability and low NVH performance and pressure pulsation performance; 2. the bearable radial load is low, and the method is difficult to be suitable for high-power scenes; 3. the sliding bearing designed by the long bearing relates to deep hole processing, has high requirements on processing equipment and has high manufacturing cost; 4. the sliding gap between the inner ring and the outer ring of the sliding bearing has the requirement that the sliding gap cannot be too large, and the long bearing design can produce a labyrinth seal-like effect, so that oil in the oil pump assembly area is difficult to flow into the motor area from the sliding gap.
Disclosure of Invention
In order to solve the problems in the above scheme, the invention provides an electronic oil pump and an electric driving system, which have the following technical scheme:
The invention provides an electronic oil pump, comprising:
A motor structural cavity;
The control structure cavity is connected with the first end of the motor structure cavity in the axial direction;
The oil pumping structure cavity is connected to the second end of the motor structure cavity in the axial direction and is matched with the motor structure cavity and/or the control structure cavity to form an oil circulation cavity positioned in the motor structure cavity; the oil pumping cavity in the oil pumping structure cavity is divided into a high-pressure area and a low-pressure area, and a rotating shaft through groove for communicating the high-pressure area with the oil circulating cavity and an oil discharging channel for communicating the low-pressure area with the oil circulating cavity are arranged on the oil pumping structure cavity;
The rotating shaft is arranged on a rotor of the motor structure cavity, a first end of the rotating shaft is rotationally or slidingly connected with the control structure cavity or the motor structure cavity, and a second end of the rotating shaft is slidingly connected with the rotating shaft through groove and extends into the oil pumping cavity to be connected with a volume pump assembly of the oil pumping structure cavity;
wherein, the sliding gap between the rotating shaft and the rotating shaft through groove is configured as an oil inlet pressure reducing channel;
The oil in the high-pressure area is depressurized through the oil inlet depressurization channel under the action of high pressure and is injected into and mixed with the oil in the oil circulation cavity, the oil in the oil circulation cavity is pumped out through the oil discharge channel under the action of low pressure in the low-pressure area, the oil inlet flow in the oil inlet depressurization channel is configured to be smaller than the oil outlet flow in the oil discharge channel, and the oil in the oil circulation cavity and the external oil form a circulation.
According to the electronic oil pump, the first end of the rotating shaft is connected with the control structure cavity or the motor structure cavity through the sliding bearing or the rolling bearing.
The invention discloses an electronic oil pump, wherein a motor structure cavity comprises a stator plastic-coated body and a rotor;
The two ends of the stator plastic coating body in the axial direction are respectively connected with the control structure cavity and the oil pumping structure cavity in a sealing way; the rotor is positioned in the middle cavity of the stator plastic coating body.
The invention discloses an electronic oil pump, wherein a motor structure cavity comprises a shell, a stator and a rotor;
The two ends of the shell in the axial direction are respectively connected with the control structure cavity and the oil pumping structure cavity in a sealing way; the stator is fixed in the inner cavity of the shell, and the rotor is positioned in the middle cavity formed by the stator.
The electronic oil pump provided by the invention is characterized in that the oil pumping structure cavity comprises an oil pumping structure bearing seat, an oil pumping shell and the volumetric pump component;
The first side of the oil pumping structure bearing seat is connected with the motor structure cavity in a sealing way, and the second side of the oil pumping structure bearing seat is matched with the oil pumping shell to form the oil pumping cavity; the rotating shaft through groove is formed in the oil pumping structure bearing seat, and the oil liquid discharge channel is an oil outlet through hole formed in the oil pumping structure bearing seat;
the positive displacement pump component is arranged in the pump oil cavity and separates the rest space of the pump oil cavity into the high-pressure area and the low-pressure area;
The rotating shaft is connected with the rotating shaft through groove in a sliding mode and is connected with the driving part of the volumetric pump assembly.
The second side of the bearing seat of the oil pumping structure is provided with a high-pressure oil liquid concave cavity and a low-pressure oil liquid concave cavity which respectively correspond to the high-pressure area and the low-pressure area;
And a first oil liquid channel is arranged between the high-pressure oil liquid concave cavity and the rotating shaft through groove.
The electronic oil pump sets the direction of the second end of the rotating shaft towards the first end of the rotating shaft as a first direction;
A second oil liquid channel is arranged in the rotating shaft through groove, the starting point of the second oil liquid channel is positioned at the second side of the oil pumping structure bearing seat, and the ending point of the second oil liquid channel is positioned in the first direction of the starting point of the second oil liquid channel; the inner ring surface of the rotating shaft through groove between the termination point of the second oil liquid channel and the first side of the oil pumping structure bearing seat is a pressure reducing surface, and a gap formed between the pressure reducing surface and the rotating shaft is the oil inlet pressure reducing channel.
According to the electronic oil pump, the second oil liquid channel is a plurality of axial grooves which are arranged around the inner ring surface of the rotating shaft through groove at intervals or thread-shaped grooves which are formed in the inner ring surface of the rotating shaft through groove.
According to the electronic oil pump, at least one middle oil storage cavity is formed in the inner ring surface of the rotating shaft through groove.
According to the electronic oil pump, the middle oil storage cavity is the annular concave cavity, the inner ring surface of the annular concave cavity separating the rotating shaft through groove is a plurality of pressure reducing surfaces, and gaps formed between each pressure reducing surface and the rotating shaft are all the oil inlet pressure reducing channels.
According to the electronic oil pump, the rotating shaft through groove is machined and formed in the bearing seat of the oil pumping structure;
Or the rotating shaft through groove is an inner ring surface of the bearing bush arranged on the bearing seat of the oil pumping structure.
The electronic oil pump comprises an internal gear and an external gear, wherein the external gear is movably arranged in an oil pumping cavity, and the internal gear is arranged at the second end of the rotating shaft and meshed with an annular gear of the external gear.
According to the electronic oil pump, the control structure cavity or the motor structure cavity is provided with the magnetic cake accommodating cavity for enabling the first end of the rotating shaft to extend in, and the control structure cavity or the motor structure cavity is provided with the blind area oil liquid guiding channel which is communicated with the magnetic cake accommodating cavity and the oil liquid circulating cavity.
An electric drive system of the present invention includes the electronic oil pump described in any one of the above.
By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:
1. According to the embodiment of the invention, the control structure cavity, the motor structure cavity and the oil pumping structure cavity are sequentially connected in the axial direction, an oil circulation cavity is formed in the motor structure cavity, and the oil pumping structure cavity is provided with the rotating shaft through groove communicated with the oil circulation cavity and the oil discharging channel, so that the oil pumping structure cavity corresponds to a high-pressure area and a low-pressure area of the oil pumping cavity respectively; the rotating shaft of the motor structural cavity is positioned at two ends, the first end is positioned in the control structural cavity or the motor structural cavity, the second end is positioned in the rotating shaft through groove, the rotating shaft is in sliding connection with the rotating shaft through groove, a sliding gap between the rotating shaft and the rotating shaft is used as an oil inlet pressure reducing channel, oil in a high-pressure area can be pressed into the oil inlet pressure reducing channel under pressure and jet into the oil circulation cavity to be mixed with internal oil, and oil in the oil circulation cavity can be pumped out through an oil discharging channel under the action of low pressure in a low-pressure area to form oil circulation, so that oil circulation cooling is realized on heat in the control structural cavity and the motor structural cavity. The pivot of this embodiment adopts both ends location, and rotor location operation is more steady, possesses good NVH performance and pressure pulsation performance, and in addition, bearable radial load is bigger, is applicable to high-power demand, has abnormal wear back at the second end of pivot under the extreme case, and first end can effectively correct axle pivoted stability.
Meanwhile, the two ends are adopted for positioning, namely, the two-section short bearing is adopted, so that the processing cost is more advantageous, and the requirements on processing equipment are also reduced. And the form of the sliding bearing with shorter length is formed at the through groove of the rotating shaft, and the length of the oil inlet pressure reducing channel can be set according to the requirement, so that the problem that oil is difficult to enter the oil circulation cavity due to overlong sliding gap length can be effectively avoided, the lubricating effect of the sliding bearing is ensured, and meanwhile, the oil inlet flow is maintained, so that the cooling effect on the control structure cavity and the motor structure cavity is ensured.
2. According to the embodiment of the invention, the first end of the rotating shaft is connected with the motor structure cavity or the control structure cavity through the rolling bearing or the sliding bearing, and the sliding bearing is arranged between the second end of the rotating shaft and the rotating shaft through groove, namely, at least one end of the rotating shaft is arranged as the sliding bearing; compared with the rolling bearing design on the market, the manufacturing precision and the part size precision are lower, the rolling bearing has higher requirements on the machining precision of the part, especially for the assembly end, as one end of the upper and lower ball bearing design naturally exists as blind assembly, the assembly difficulty and the requirements are extremely high, and the rolling bearing cost is several times of the sliding bearing structural design cost;
3. In one embodiment of the invention, the oil is configured to be injected into the oil circulation cavity from the sliding gap between the rotating shaft and the rotating shaft through groove to be mixed with the oil therein for cooling, and the oil does not need to be guided to flow and cool along a specific direction, so that the oil outlet through hole of the embodiment can be arranged on the bearing seat of the oil pumping structure, negative pressure is provided by the negative pressure area of the oil pumping cavity to pump the oil to realize circulation, and the manufacturing cost of the rotating shaft and the manufacturing cost of the oil outlet channel can be greatly saved instead of the conventional scheme that the rotating shaft is arranged as a hollow shaft to serve as the oil outlet channel.
Drawings
Fig. 1 is a cross-sectional view of an electronic oil pump of the present invention;
fig. 2 is another cross-sectional view of the electronic oil pump of the present invention;
FIG. 3 is a cross-sectional view showing an oil through hole in another form of shaft positioning of the electronic oil pump of the present invention;
FIG. 4 is a cross-sectional view of another form of shaft positioning of the electronic oil pump of the present invention;
FIG. 5 is a schematic view of a bearing housing of an oil pump structure of an electronic oil pump according to the present invention;
FIG. 6 is a cross-sectional view of a bearing housing of an oil pumping structure of an electronic oil pump of the present invention;
FIG. 7 is a cross-sectional view of the pumping chamber of the electronic oil pump of the present invention;
FIG. 8 is a schematic diagram of the connection of the spindle of the electronic oil pump of the present invention to the positive displacement pump assembly;
FIG. 9 is a cross-sectional view of the shaft of the electronic oil pump of the present invention connected to a positive displacement pump assembly;
fig. 10 is a schematic diagram of an oil circulation path of the electronic oil pump according to the present invention.
Reference numerals illustrate: 1. a motor structural cavity; 101. a rotor; 102. a stator plastic coating body; 103. a housing; 2. controlling the structural cavity; 3. an oil pumping structural cavity; 301. bearing seat of oil pumping structure; 3011. the rotating shaft is communicated with the groove; 3012. a high pressure oil liquid concave cavity; 3013. a low pressure oil recess cavity; 3014. an oil outlet through hole; 3015. the first oil liquid channel; 3016. a second oil passage; 3017; an intermediate oil storage chamber; 302. a pump oil housing; 303. an internal gear; 304. an external gear; 4. a rotating shaft; 401. a circlip; 402. a flat structure; 5. a graphite bearing; 6: an oil circulation cavity.
Detailed Description
The invention provides an electronic oil pump and an electric drive system, which are further described in detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims.
Referring to fig. 1 and 10, in one embodiment, an electronic oil pump includes a motor structural chamber 1, a control structural chamber 2, an oil pumping structural chamber 3, and a rotating shaft 4.
The control-structure chamber 2 is connected to a first end of the motor-structure chamber 1 in the axial direction. The oil pumping structure cavity 3 is connected to the second end of the motor structure cavity 1 in the axial direction and forms an oil circulation cavity 6 positioned in the motor structure cavity 1 in cooperation with the motor structure cavity 1 and/or the control structure cavity 2. The oil pumping cavity in the oil pumping structure cavity 3 is divided into a high-pressure area and a low-pressure area, and the oil pumping structure cavity 3 is provided with a rotating shaft through groove 3011 for communicating the high-pressure area with the oil circulating cavity 6 and an oil discharging channel for communicating the low-pressure area with the oil circulating cavity 6;
the rotating shaft 4 is installed on the rotor 101 of the motor structural cavity 1, the first end of the rotating shaft 4 is rotatably or slidably connected with the control structural cavity 2 or the motor structural cavity 1, and the second end of the rotating shaft 4 is slidably connected with the rotating shaft through groove 3011 and extends into the oil pumping cavity to be connected with the volume pump assembly of the oil pumping structural cavity 3. The sliding gap between the rotating shaft 4 and the rotating shaft through groove 3011 is an oil inlet pressure reducing channel.
The control structural cavity 2 is connected with external electric energy and outputs the electric energy to the motor structural cavity 1, the driving rotor 101 and the rotating shaft 4 rotate and transmit power to the volumetric pump assembly together with the rotating shaft 4, and the volumetric pump assembly forms the high-pressure area and the low-pressure area in the pump oil cavity in a capacity-changing mode. The oil in the high-pressure area is injected into and mixed with the oil in the oil circulation cavity 6 at a preset pressure after being depressurized through the oil inlet depressurization channel under the action of high pressure; under the action of the pressure difference between the low pressure in the low pressure area and the pressure in the oil circulation cavity 6, the oil in the oil circulation cavity 6 is pumped out through the oil discharge channel, and the oil inlet flow in the oil inlet pressure reducing channel is set to be smaller than the oil outlet flow in the oil discharge channel, so that the oil circulation cavity 6 is always kept in a state full of oil, namely, the oil in the oil circulation cavity 6 and the oil pumped in from the outside form circulation. Therefore, the external oil pumped by the oil pumping structure cavity 3 can be led out in a leakage-like manner to lubricate and cool, namely, the sliding bearing formed between the rotating shaft 4 and the rotating shaft through groove 3011 is lubricated, and the cooling is to pump and pump the external oil into the oil circulation cavity 6 respectively to form circulation, and the circulating oil takes away the heat in the electronic oil pump.
While the specific leakage amount (i.e., the circulation flow rate in the oil circulation chamber 6, which may be substantially equivalent to the oil discharge flow rate at the oil discharge passage) may be determined according to the cooling amount required for the motor structural chamber 1 and the control structural chamber 2 as a whole.
According to the embodiment, a control structure cavity 2, a motor structure cavity 1 and an oil pumping structure cavity 3 which are axially and sequentially connected are arranged, an oil circulation cavity 6 is formed in the motor structure cavity 1, a rotating shaft through groove 3011 and an oil discharging channel which are communicated with the oil circulation cavity 6 are arranged on the oil pumping structure cavity 3, and the rotating shaft through groove 3011 and the oil discharging channel correspond to a high-pressure area and a low-pressure area of an oil pumping cavity respectively; the rotating shaft 4 of the motor structural cavity 1 is set to be positioned at two ends, the first end is positioned in the control structural cavity 2 or the motor structural cavity 1, the second end is positioned in the rotating shaft through groove 3011, the rotating shaft 4 is connected with the rotating shaft through groove 3011 in a sliding mode, a sliding gap between the rotating shaft 4 and the rotating shaft through groove 3011 is used as an oil inlet pressure reducing channel, oil in a high-pressure area can be pressed into the oil inlet pressure reducing channel under pressure and is sprayed into the oil circulation cavity 6 to be mixed with internal oil, and the oil in the oil circulation cavity 6 can be pumped out through an oil discharging channel under the action of low pressure in a low-pressure area to form oil circulation, so that oil circulation cooling is carried out on heat in the control structural cavity 2 and the motor structural cavity 1. The pivot 4 of this embodiment adopts both ends location, and rotor 101 location operation is more steady, possesses good NVH performance and pressure pulsation performance, and in addition, bearable radial load is bigger, is applicable to the high-power demand, and there is unusual wearing and tearing back at the second end of pivot 4 under extreme conditions, and first end can effectively correct axle pivoted stability.
Meanwhile, the two ends are adopted for positioning, namely, the two-section short bearing is adopted, so that the processing cost is more advantageous, and the requirements on processing equipment are also reduced. And, the pivot leads to the form of the shorter slide bearing of groove 3011 department formation length, can set up the length of oil feed decompression passageway according to the demand, therefore can effectively avoid leading to the problem that fluid is difficult to get into fluid circulation chamber 6 because of slip clearance length overlength, when guaranteeing the lubrication effect of slide bearing department, maintain the oil feed flow to guarantee the cooling effect to control structure chamber 2 and motor structure chamber 1.
The specific structure of the electronic oil pump of this embodiment is further described below:
In the present embodiment, the first end of the rotating shaft 4 is connected to the control structure chamber 2 or the motor structure chamber 1 through a sliding bearing or a rolling bearing. Referring to fig. 2, it is usual to connect the control structure chamber 2 by means of a sliding bearing or rolling bearing, i.e. the surface of the control structure chamber 2 facing the motor structure chamber 1 is provided with a recess or annular protrusion, to mount the corresponding bearing for connection to the first end of the shaft 4. The sliding bearing can be a graphite bearing 5, and has good wear resistance and processing characteristics.
In the solution that the first end of the rotating shaft 4 is connected to the motor structural cavity 1 through a sliding bearing or a rolling bearing, the stator in the motor structural cavity 1 needs to be set to be a stator plastic-coated body 102 formed by plastic coating, and the stator plastic-coated body 102 is set to be in a through hole or similar to a blind hole, see fig. 4, the through hole is used as an outer ring mounting hole of the sliding bearing or the rolling bearing, see fig. 3, the blind hole is formed by opening one side of the stator plastic-coated body 102 facing the oil pumping structural cavity 3, one side facing the control structural cavity 2 is in a solid structure, and the concave or annular bulge is formed on the solid structure, so that the corresponding bearing is mounted.
In this embodiment, the structure of the motor structural cavity 1 can be divided into two types to match different connection modes, and the first structure is that the motor structural cavity 1 includes a housing 103, a stator and a rotor 101. The two ends of the outer shell 103 in the axial direction are respectively connected with the control structure cavity 2 and the oil pumping structure cavity 3 in a sealing way, the stator is fixed in the inner cavity of the outer shell 103, and the rotor 101 is positioned in the middle cavity formed by the stator. This assembly is based on the housing 103, and the remaining components are assembled to the housing 103, respectively.
While the second structure may be that the motor structural cavity 1 comprises a stator casing 102 and a rotor 101. The two ends of the stator plastic coating body 102 in the axial direction are respectively connected with the control structure cavity 2 and the oil pumping structure cavity 3 in a sealing way, and the rotor 101 is positioned in the middle cavity of the stator plastic coating body 102. Specifically, the control structural cavity 2 and the oil pumping structural cavity 3 can be respectively mounted on the inner ring surface or the outer ring surface of the stator plastic coating body 102 in an interference fit or sealing ring mode, and the shell can be omitted or the shell is only adopted to carry out wrapping protection on the whole formed by the three structural cavities. Meanwhile, if the inner cavity of the stator plastic coating body 102 is set to axially penetrate, and the inner ring surface of the stator plastic coating body 102 is used as an assembly surface corresponding to two structural cavities, the aim of reducing accumulated errors can be achieved relative to the scheme that each structural cavity is arranged on the shell 103, the coaxiality between the rotor 101 and the stator is further improved while the assembly difficulty is reduced, so that an air gap between the rotor 101 and the stator can be effectively ensured, and the rotation stability of the rotor 101 is effectively ensured.
Referring to fig. 5-7, in the present embodiment, the pumping arrangement chamber 3 may specifically include a pumping arrangement bearing housing 301, a pumping housing 302, and a volumetric pump assembly.
The first side of the oil pumping structure bearing seat 301 is connected to the motor structure cavity 1 in a sealing manner (that is, an assembly protrusion corresponding to the inner ring surface of the stator plastic coating body 102/the inner ring surface of the shell can be formed on the first side of the oil pumping structure bearing seat 301, connection and sealing are realized in an interference fit manner), the second side of the oil pumping structure bearing seat 301 is engaged with the oil pumping shell 302 and is matched with the oil pumping cavity (the two can be connected in an interference fit manner, that is, a corresponding assembly structure is formed on the second side of the oil pumping structure bearing seat 301 and the oil pumping shell 302, and connection is realized through matching of the inner ring surface and the outer ring surface). The rotary shaft through groove 3011 is disposed on the oil pumping structure bearing seat 301, and the oil discharging channel can be called an oil discharging through hole 3014 disposed on the oil pumping structure bearing seat 301.
The volumetric pump assembly is arranged in the pump oil cavity, and the volume of the two sides of the rest space of the pump oil cavity is compressed and increased to separate the rest space of the pump oil cavity into a high-pressure area and a low-pressure area which are positioned on the two sides. The second end of the rotating shaft 4 is slidably connected to the rotating shaft through groove 3011 and extends into the pump oil cavity to be connected with the driving component of the volumetric pump assembly.
The second side of the bearing seat 301 of the oil pumping structure may be provided with a high-pressure oil liquid concave chamber 3012 and a low-pressure oil liquid concave chamber 3013 corresponding to the high-pressure area and the low-pressure area respectively (i.e. the volumetric pump assembly compresses the volume at the position of the active component to compress the oil liquid at the position to the high-pressure oil liquid concave chamber 3012 to form high pressure, and forms a certain negative pressure at the side of the volumetric pump assembly facing away from the bearing seat 301 of the oil pumping structure to suck external oil liquid, and in the same way, the active component expands the volume at the position of the active component to form negative pressure at the position of the low-pressure oil liquid concave chamber 3013). In order to ensure that the high-pressure oil in the high-pressure oil recess 3012 can smoothly flow to the rotating shaft through groove 3011, a first oil channel 3015 is arranged between the high-pressure oil recess 3012 and the rotating shaft through groove 3011, and the cross-sectional area of the first oil channel 3015 needs to meet the requirement that the oil flow can be allowed to reach the circulation flow required in the oil circulation cavity 6 under the oil pressure; of course, on the premise of meeting the requirement of the oil flow, the first oil passage 3015 may be used as a depressurizing passage, for example, a plurality of small-area passages are formed to be combined.
Further, the first oil passage 3015 may be configured as an elongated through slot directly formed on the second side of the bearing seat 301 of the oil pumping structure, or may be configured as a combination of a plurality of through slots, where the path of the through slot may be a straight line, a curve, or an irregular pattern, which is not specifically limited herein. For example, a plurality of through grooves can be formed, the head ends of the through grooves are communicated with the high-pressure oil liquid concave cavity 3012, and the tail ends of the through grooves are respectively arranged on the circumferential surface of the rotating shaft through groove 3011 at intervals along the circumferential direction, so that the rotating shaft through groove 3011 can uniformly feed oil in the circumferential direction.
The direction of the second end of the rotating shaft 4 toward the first end of the rotating shaft 4 is set as the first direction. In this embodiment, a second oil channel 3016 is formed in the through groove 3011 of the rotating shaft, a start point of the second oil channel 3016 is located on a second side of the bearing seat 301 of the oil pumping structure, and an end point of the second oil channel 3016 is located in a first direction of the start point of the second oil channel 3016, that is, an extending direction of the second oil channel 3016 is axial. The inner ring surface of the rotating shaft through groove 3011 between the termination point of the second oil channel 3016 and the first side of the bearing seat 301 of the oil pumping structure is a pressure reducing surface, and a gap formed between the pressure reducing surface and the rotating shaft 4 is an oil inlet pressure reducing channel (because the cross-sectional area of the axial section of the inner ring surface of the rotating shaft through groove 3011 where the second oil channel 3016 is located is enlarged, the pressure reducing effect is weakened, and thus the design can not be performed as a pressure reducing surface, the main purpose of the arrangement of the second oil channel 3016 is to ensure the oil inlet amount, and meanwhile, the required length of the pressure reducing surface can be obtained according to the adjustment of the extending length of the second oil channel 3016 in the axial direction).
Further, the second oil channel 3016 may be a plurality of axial slots (i.e. three to four axial slots extending along the axial direction may be disposed on the inner ring surface of the rotating shaft through slot 3011) arranged at intervals around the inner ring surface of the rotating shaft through slot 3011, or a thread slot (the thread slot may be machined by turning or tapping) formed on the inner ring surface of the rotating shaft through slot 3011. Of course, in other embodiments, the second oil passage 3016 is not limited to the two types described above, and is not specifically limited herein.
In this embodiment, in order to prevent the oil from being difficult to pass due to the overlong length of the single oil inlet pressure reducing channel, at least one intermediate oil storage cavity 3017 may be formed on the inner ring surface of the rotating shaft through groove 3011 as an intermediate oil storage space.
The middle oil storage cavity 3017 can be an annular concave cavity, the annular concave cavity can separate an inner ring surface of the rotating shaft through groove 3011 into a plurality of independent pressure reducing surfaces, gaps formed between each pressure reducing surface and the rotating shaft 4 are oil inlet pressure reducing channels, namely a plurality of spaced oil inlet pressure reducing channels are formed, and an annular concave cavity for temporarily storing oil is formed between every two adjacent oil inlet pressure reducing channels.
In this embodiment, in order to ensure that the oil outlet flow rate meets the requirement, and because the low pressure formed by the volumetric pump assembly in the low pressure oil recess 3013 is substantially stable, the oil outlet flow rate can be adjusted by controlling the cross-sectional area of the oil outlet through hole 3014.
In this embodiment, in order to enable the flow rate of the oil injected into the oil circulation cavity 6 to meet the circulation requirement, and to ensure that the injection rate of the oil injected into the oil circulation cavity 6 can meet the mixing effect with the original oil in the oil circulation cavity 6.
In this embodiment, the oil flow rate required for the oil circulation is Q (the oil flow rate is the same at the first oil passage 3015, the second oil passage 3016, the oil inlet pressure reducing passage, and the oil outlet through hole 3014). And, the pressure P 1 in the high pressure area and the pressure P 2 in the low pressure area are substantially constant, so that during the circulation process, a certain pressure difference is generated when the oil flows through the first oil channel 3015, the second oil channel 3016, the oil inlet pressure reducing channel and the oil outlet through hole 3014, the partial pressure difference can be set and distributed between P 1 and P 2, the pressure difference Δp 3 of the oil inlet pressure reducing channel mainly aims at pressure reduction, the value of the pressure difference Δp 1、ΔP2、ΔP4 formed at the first oil channel 3015, the second oil channel 3016 and the oil outlet through hole 3014 is mainly based on the pressure loss generated by the oil in the corresponding channels, and the value of the pressure difference Δp 1、ΔP2、ΔP4 is small.
Based on the above-mentioned Q, Δp 3, specific dimensional parameters of the oil inlet pressure reducing channel (similar to concentric annular gap) can be obtained, namely, the relation between the outer diameter, inner diameter and length in radial direction of the oil inlet pressure reducing channel, wherein the outer diameter and inner diameter need to be set close to the dimension of the rotating shaft 4 (i.e. within a reasonable range based on the diameter of the rotating shaft 4); and the specific value ranges of the outer diameter, the inner diameter and the length in the radial direction of the oil inlet pressure reducing channel can be obtained based on Q and the area of the oil inlet pressure reducing channel according to the oil injection speed V required by the oil injection into the oil circulation cavity 6.
And, based on Q and Δp 1、ΔP2、ΔP4, the size parameters of the first oil passage 3015, the second oil passage 3016, and the oil outlet through hole 3014 can be calculated, and the size parameters of the first oil passage include the cross-sectional area and the length of the passage (the ratio of the cross-sectional area to the length of the passage is proportional to the oil flow, and the ratio of the cross-sectional area to the length of the passage is inversely proportional to the pressure difference). Wherein the first oil passage 3015 may approximate rectangular tubing, and the second oil passage 3016 and the oil outlet through-holes 3014 may approximate circular tubing.
Therefore, for the electronic oil pump with the power of 120W-350W, based on the pressure of a high-pressure area, the pressure of a low-pressure area, the cooling requirement, the size limitation of the rotating shaft 4 and other parts, the external diameter of the pressure reducing channel can be 10.03-10.045mm, the internal diameter can be 10-10.007mm, and the radial length can be 12.88-12.93mm, so that the required pressure reducing requirement, oil jet speed and circulation flow can be met.
Likewise, for an electronic oil pump with power of 120W-350W, the cross-sectional area of the first oil channel 3015 can be 11-11.05mm 2 based on the pressure of the high-pressure area, the pressure of the low-pressure area, the cooling requirement, the size limitation of the rotating shaft 4 and other components, and the length of the first oil channel 3015 can be 5.5-6mm; the cross-sectional area of the second oil passage 3016 may range from 2.83 mm to 3.46mm 2, the number of the second oil passages may be 4, and the length of the second oil passage 3016 may range from 5.5 mm to 6mm.
In this embodiment, the rotary shaft through groove 3011 may be directly machined and formed on the oil pumping structure bearing seat 301, but this solution requires structural strength and wear resistance of the oil pumping structure bearing seat 301, and may be die-cast by using powder metallurgy material (specifically, may be iron-based powder).
In other embodiments, in order to save material cost, the through groove 3011 of the rotating shaft may be an inner ring surface of a bearing bush mounted on the bearing block 301 of the oil pumping structure, that is, the bearing block 301 of the oil pumping structure may be produced by using conventional materials, and the bearing block 301 of the oil pumping structure may be provided with a bearing bush mounting hole coaxial with the through groove 3011 of the rotating shaft, and the bearing bush may be mounted in the bearing bush mounting hole in an interference fit manner.
Referring to fig. 8 and 9, in this embodiment, the volumetric pump assembly may specifically be a gear pump, including an inner gear 303 and an outer gear 304, where the outer gear 304 is movably disposed in the pumping chamber, and the inner gear 303 is mounted at the second end of the rotating shaft 4 and engaged with an inner gear ring of the outer gear 304. The internal gear 303 drives the external gear 304 to rotate under the action of the rotating shaft 4, the rotating external gear 304 rotates in the oil pumping cavity, and the volume change is realized through the engagement and separation between the internal gear and the external gear, so that the pumping in and pumping out of oil liquid are realized.
The second end of the rotating shaft 4 may be configured as a stepped shaft, the internal gear 303 may be connected to a small diameter section of the stepped shaft through a flat structure 402, so as to realize circumferential rotation limitation, and an elastic retainer ring 401 may be configured to cooperate with a step surface of the stepped shaft to realize axial limitation of the internal gear 303. Further, the flat connection between the inner gear 303 and the small-diameter section can be set to be in clearance fit, so that the gap at the flat connection position can be further obtained outside the bearing gap at the sliding bearing position of the inner gear 303, higher fault tolerance is achieved, and the situation that the inner gear 303 is possibly blocked due to the fact that impurities are mixed in oil is avoided.
In this embodiment, since the first end of the rotating shaft 4 needs to be provided with a magnetic cake, the control structural cavity 2 or the motor structural cavity 1 is provided with a magnetic cake accommodating cavity for enabling the first end of the rotating shaft 4 to extend into, and the oil in the oil circulation cavity 6 easily forms a blind area after entering the magnetic cake accommodating cavity, and the blind area and a control board (e.g., ECU) in the control structural cavity 2 basically belong to direct heat transfer, and the oil in the blind area easily changes quality under the condition of high temperature, thereby affecting the rotation or sliding at the first end of the rotating shaft 4; therefore, in this embodiment, the control structural cavity 2 or the motor structural cavity 1 is provided with a blind area oil guiding channel which is communicated with the magnetic cake accommodating cavity and the oil circulating cavity 6, so that the oil entering the magnetic cake accommodating cavity can enter the oil circulating cavity 6 again for circulation through the blind area oil guiding channel.
Example two
The present embodiment provides an electric drive system including the electronic oil pump in the first embodiment. The electronic oil pump is characterized in that a control structure cavity 2, a motor structure cavity 1 and an oil pumping structure cavity 3 which are axially and sequentially connected are arranged, an oil circulation cavity 6 is formed in the motor structure cavity 1, a rotating shaft through groove 3011 and an oil discharging channel which are communicated with the oil circulation cavity 6 are arranged on the oil pumping structure cavity 3, and the rotating shaft through groove 3011 and the oil discharging channel correspond to a high-pressure area and a low-pressure area of an oil pumping cavity respectively; the rotating shaft 4 of the motor structural cavity 1 is set to be positioned at two ends, the first end is positioned in the control structural cavity 2 or the motor structural cavity 1, the second end is positioned in the rotating shaft through groove 3011, the rotating shaft 4 is connected with the rotating shaft through groove 3011 in a sliding mode, a sliding gap between the rotating shaft 4 and the rotating shaft through groove 3011 is used as an oil inlet pressure reducing channel, oil in a high-pressure area can be pressed into the oil inlet pressure reducing channel under pressure and is sprayed into the oil circulation cavity 6 to be mixed with internal oil, and the oil in the oil circulation cavity 6 can be pumped out through an oil discharging channel under the action of low pressure in a low-pressure area to form oil circulation, so that oil circulation cooling is carried out on heat in the control structural cavity 2 and the motor structural cavity 1. The pivot 4 adopts both ends location, and rotor 101 location operation is more steady, possesses good NVH performance and pressure pulsation performance, and in addition, bearable radial load is bigger, is applicable to high-power demand, has abnormal abrasion back at the second end of pivot 4 under the extreme case, and first end can effectively correct axle pivoted stability.
Meanwhile, the two ends are adopted for positioning, namely, the two-section short bearing is adopted, so that the processing cost is more advantageous, and the requirements on processing equipment are also reduced. And, the pivot leads to the form of the shorter slide bearing of groove 3011 department formation length, can set up the length of oil feed decompression passageway according to the demand, therefore can effectively avoid leading to the problem that fluid is difficult to get into fluid circulation chamber 6 because of slip clearance length overlength, when guaranteeing the lubrication effect of slide bearing department, maintain the oil feed flow to guarantee the cooling effect to the interior heating element of electronic oil pump.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.
Claims (14)
1. An electronic oil pump, characterized by comprising:
A motor structural cavity;
The control structure cavity is connected with the first end of the motor structure cavity in the axial direction;
The oil pumping structure cavity is connected to the second end of the motor structure cavity in the axial direction and is matched with the motor structure cavity and/or the control structure cavity to form an oil circulation cavity positioned in the motor structure cavity; the oil pumping cavity in the oil pumping structure cavity is divided into a high-pressure area and a low-pressure area, and a rotating shaft through groove for communicating the high-pressure area with the oil circulating cavity and an oil discharging channel for communicating the low-pressure area with the oil circulating cavity are arranged on the oil pumping structure cavity;
The rotating shaft is arranged on a rotor of the motor structure cavity, a first end of the rotating shaft is rotationally or slidingly connected with the control structure cavity or the motor structure cavity, and a second end of the rotating shaft is slidingly connected with the rotating shaft through groove and extends into the oil pumping cavity to be connected with a volume pump assembly of the oil pumping structure cavity;
wherein, the sliding gap between the rotating shaft and the rotating shaft through groove is configured as an oil inlet pressure reducing channel;
The oil in the high-pressure area is depressurized through the oil inlet depressurization channel under the action of high pressure and is injected into and mixed with the oil in the oil circulation cavity, the oil in the oil circulation cavity is pumped out through the oil discharge channel under the action of low pressure in the low-pressure area, the oil inlet flow in the oil inlet depressurization channel is configured to be smaller than the oil outlet flow in the oil discharge channel, and the oil in the oil circulation cavity and the external oil form a circulation.
2. The electronic oil pump of claim 1, wherein the first end of the shaft is connected to the control structure chamber or the motor structure chamber by a sliding bearing or a rolling bearing.
3. The electronic oil pump of claim 1, wherein the motor structural cavity comprises a stator casing and the rotor;
The two ends of the stator plastic coating body in the axial direction are respectively connected with the control structure cavity and the oil pumping structure cavity in a sealing way; the rotor is positioned in the middle cavity of the stator plastic coating body.
4. The electronic oil pump of claim 1, wherein the motor structural cavity comprises a housing, a stator, and the rotor;
The two ends of the shell in the axial direction are respectively connected with the control structure cavity and the oil pumping structure cavity in a sealing way; the stator is fixed in the inner cavity of the shell, and the rotor is positioned in the middle cavity formed by the stator.
5. The electronic oil pump of claim 1, wherein the pumping structure cavity comprises a pumping structure bearing housing, a pumping shell, the volumetric pump assembly;
The first side of the oil pumping structure bearing seat is connected with the motor structure cavity in a sealing way, and the second side of the oil pumping structure bearing seat is matched with the oil pumping shell to form the oil pumping cavity; the rotating shaft through groove is formed in the oil pumping structure bearing seat, and the oil liquid discharge channel is an oil outlet through hole formed in the oil pumping structure bearing seat;
the positive displacement pump component is arranged in the pump oil cavity and separates the rest space of the pump oil cavity into the high-pressure area and the low-pressure area;
The rotating shaft is connected with the rotating shaft through groove in a sliding mode and is connected with the driving part of the volumetric pump assembly.
6. The electronic oil pump of claim 5, wherein a high pressure oil liquid concave cavity and a low pressure oil liquid concave cavity corresponding to the high pressure area and the low pressure area respectively are formed on the second side of the oil pumping structure bearing seat;
And a first oil liquid channel is arranged between the high-pressure oil liquid concave cavity and the rotating shaft through groove.
7. The electronic oil pump of claim 5, wherein a direction of the second end of the rotating shaft toward the first end of the rotating shaft is set to be a first direction;
A second oil liquid channel is arranged in the rotating shaft through groove, the starting point of the second oil liquid channel is positioned at the second side of the oil pumping structure bearing seat, and the ending point of the second oil liquid channel is positioned in the first direction of the starting point of the second oil liquid channel; the inner ring surface of the rotating shaft through groove between the termination point of the second oil liquid channel and the first side of the oil pumping structure bearing seat is a pressure reducing surface, and a gap formed between the pressure reducing surface and the rotating shaft is the oil inlet pressure reducing channel.
8. The electronic oil pump of claim 7, wherein the second oil channel is a plurality of axial slots arranged at intervals around the inner ring surface of the rotating shaft through slot or a thread-shaped slot arranged on the inner ring surface of the rotating shaft through slot.
9. The electronic oil pump of claim 5, wherein the inner ring surface of the rotating shaft through groove is provided with at least one middle oil storage cavity.
10. The electronic oil pump of claim 9, wherein the intermediate oil storage cavity is an annular recessed cavity, an inner ring surface of the annular recessed cavity separating the rotating shaft through groove is a plurality of pressure reducing surfaces, and a gap formed between each pressure reducing surface and the rotating shaft is the oil inlet pressure reducing channel.
11. The electronic oil pump of claim 5, wherein the shaft is machined into the oil pumping structure bearing block;
Or the rotating shaft through groove is an inner ring surface of the bearing bush arranged on the bearing seat of the oil pumping structure.
12. The electronic oil pump of claim 5 wherein the volumetric pump assembly includes an inner gear and an outer gear, the outer gear movably disposed within the pump oil chamber, the inner gear mounted to the second end of the shaft and meshed with the inner gear ring of the outer gear.
13. The electronic oil pump of claim 1, wherein the control structure cavity or the motor structure cavity is provided with a magnetic cake accommodating cavity for enabling the first end of the rotating shaft to extend in, and the control structure cavity or the motor structure cavity is provided with a dead zone oil guiding channel which is communicated with the magnetic cake accommodating cavity and the oil circulation cavity.
14. An electric drive system comprising the electronic oil pump according to any one of claims 1 to 15.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2023103379540 | 2023-03-31 | ||
| CN202310337954.0A CN116181645A (en) | 2023-03-31 | 2023-03-31 | Electronic oil pump and electric drive system |
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| CN118066113A true CN118066113A (en) | 2024-05-24 |
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| CN202310337954.0A Pending CN116181645A (en) | 2023-03-31 | 2023-03-31 | Electronic oil pump and electric drive system |
| CN202410375820.2A Pending CN118066113A (en) | 2023-03-31 | 2024-03-29 | Electronic oil pump and electric drive system |
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| CN202310337954.0A Pending CN116181645A (en) | 2023-03-31 | 2023-03-31 | Electronic oil pump and electric drive system |
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| CN118998043A (en) * | 2024-10-25 | 2024-11-22 | 杭州安衡迅科技有限公司 | Hydraulic drive device |
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