CN111734623B - Cycloid pump and closed hydraulic system - Google Patents
Cycloid pump and closed hydraulic system Download PDFInfo
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- CN111734623B CN111734623B CN202010610793.4A CN202010610793A CN111734623B CN 111734623 B CN111734623 B CN 111734623B CN 202010610793 A CN202010610793 A CN 202010610793A CN 111734623 B CN111734623 B CN 111734623B
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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
- 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
- F04C2/102—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 the two members rotating simultaneously around their respective axes
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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
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0023—Axial sealings for working fluid
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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
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
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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
- 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
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/084—Toothed wheels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The invention relates to the field of hydraulic systems and discloses a cycloid pump and a closed hydraulic system, wherein the cycloid pump comprises a shell provided with an oil inlet and an oil outlet, an inner rotor, a common rotor and an outer rotor which are rotatably arranged in the shell and are sequentially sleeved from inside to outside; the common rotor is meshed with the outer rotor differential teeth to form an outer pump, and two ends of the outer pump are sealed by the shell to form an outer low-pressure oil suction cavity and an outer high-pressure oil discharge cavity; the common rotor and the inner rotor differential gear are meshed to form an inner pump, and two ends of the inner pump are sealed by the shell to form an inner low-pressure oil suction cavity and an inner high-pressure oil discharge cavity; the oil inlet is communicated with both the outer low-pressure oil suction cavity and the inner low-pressure oil suction cavity, and the oil outlet is communicated with both the outer high-pressure oil discharge cavity and the inner high-pressure oil discharge cavity. The invention merges the oil discharge of the inner pump and the oil discharge of the outer pump and discharges the merged oil through the oil outlet, thereby increasing the displacement of the cycloid pump, and compared with the common cycloid pump with the same displacement, the invention has small volume and weight.
Description
Technical Field
The invention relates to the field of hydraulic systems, in particular to a cycloid pump and a closed hydraulic system.
Background
The cycloid pump adopts an integral equidistant curve of a short-amplitude epicycloid as a tooth profile of an inner rotor, the tooth profile of an outer rotor adopts a conjugate circular arc tooth profile as the tooth profile curve, the tooth number difference between the inner rotor and the outer rotor is 1, the conjugate inner rotor and the conjugate outer rotor are meshed with each other, a closed containing cavity is formed between a front side plate and a rear side plate of the cycloid pump, and the closed containing cavity with the volume change is formed along with the meshing rotation of the inner rotor and the outer rotor so as to realize oil absorption and oil discharge.
The displacement of the common cycloid pump is small; when the ordinary cycloid pump is applied to a closed hydraulic system as an oil supplementing pump, in order to meet the use requirement, the tooth width, the tooth height, the gear tooth number, the gear module and the like of the inner rotor and the outer rotor need to be increased, so that the volume and the weight of the cycloid pump are increased, and the power density of the closed pump is reduced.
Disclosure of Invention
The invention aims to provide a cycloid pump, which can increase the displacement and reduce the weight and the volume of the cycloid pump.
Another object of the present invention is to provide a closed hydraulic system that improves the power density of a closed pump.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cycloid pump comprises a shell provided with an oil inlet and an oil outlet, and an inner rotor, a common rotor and an outer rotor which are rotatably arranged in the shell and are sleeved from inside to outside in sequence;
the public rotor is meshed with the outer rotor differential teeth to form an outer pump, and two ends of the outer pump are sealed by the shell to form an outer low-pressure oil suction cavity and an outer high-pressure oil discharge cavity; the public rotor is meshed with the inner rotor differential teeth to form an inner pump, and two ends of the inner pump are sealed by the shell to form an inner low-pressure oil suction cavity and an inner high-pressure oil discharge cavity;
the oil inlet is communicated with the outer low-pressure oil suction cavity and the inner low-pressure oil suction cavity, and the oil outlet is communicated with the outer high-pressure oil discharge cavity and the inner high-pressure oil discharge cavity.
As a preferred technical scheme of the above-mentioned gerotor pump, the oil inlet is communicated with the outer low-pressure oil suction cavity, and the oil outlet is communicated with the outer high-pressure oil discharge cavity;
the shell is provided with a low-pressure oil duct which is communicated with the outer low-pressure oil suction cavity and the inner low-pressure oil suction cavity, and a high-pressure oil duct which is communicated with the outer high-pressure oil discharge cavity and the inner high-pressure oil discharge cavity.
As a preferable aspect of the above gerotor pump, the low-pressure oil passage includes, provided in the housing:
the inner low-pressure arc-shaped oil passage is communicated with the inner low-pressure oil suction cavity;
the outer low-pressure arc-shaped oil passage is communicated with the outer low-pressure oil suction cavity;
and one end of the low-pressure communicating oil passage is communicated with the inner low-pressure arc-shaped oil passage, and the other end of the low-pressure communicating oil passage is communicated with the outer low-pressure arc-shaped oil passage.
As a preferable technical solution of the above gerotor pump, the high-pressure oil passage includes, provided in the housing:
the inner high-pressure arc-shaped oil passage is communicated with the inner high-pressure oil suction cavity;
the outer high-pressure arc-shaped oil passage is communicated with the outer high-pressure oil suction cavity;
and one end of the high-pressure communicating oil passage is communicated with the inner high-pressure arc-shaped oil passage, and the other end of the high-pressure communicating oil passage is communicated with the outer high-pressure arc-shaped oil passage.
As a preferred embodiment of the above-mentioned gerotor pump, it further comprises a drive shaft connected to said common rotor.
As a preferable technical solution of the above-mentioned gerotor pump, a sealing member is provided between the drive shaft and the common rotor, so that the inner low-pressure oil suction chamber and the inner high-pressure oil discharge chamber at the end of the common rotor connected to the drive shaft are both separated from the outer low-pressure oil suction chamber and the outer high-pressure oil discharge chamber.
As a preferred technical solution of the above-mentioned gerotor pump, the inner rotor is rotatably connected to the housing through a first bearing;
and/or the driving shaft is rotationally connected with the shell through a second bearing;
and/or an eccentric ring connected with the shell is arranged in the shell, and the eccentric ring is sleeved outside the outer rotor, so that the outer rotor can only rotate around the axis of the outer rotor.
As a preferable technical solution of the above-mentioned gerotor pump, the inner wall of the common rotor is provided with inner teeth engaged with the inner rotor, and the outer wall of the common rotor is provided with outer teeth engaged with the outer rotor;
the number of teeth of internal tooth equals the number of teeth +1 of inner rotor, the number of teeth of external tooth equals the number of teeth-1 of outer rotor, the number of teeth of internal tooth equals the number of teeth of outer rotor, the number of teeth of inner rotor equals the number of teeth of external tooth.
In a preferred embodiment of the above-described gerotor pump, a misalignment angle between a start angle of a crest midpoint of any one of the external teeth and a start angle of a root midpoint of the internal tooth adjacent thereto is 2 pi/number of teeth of the outer rotor.
The invention also provides a closed hydraulic system which comprises the cycloid pump.
The invention has the beneficial effects that: the cycloid pump provided by the invention is simple and compact in structure, the oil discharged by the inner pump and the oil discharged by the outer pump are converged and then discharged from the oil outlet, the displacement of the cycloid pump is increased, and compared with a common cycloid pump, the cycloid pump with the same displacement has the advantages that the volume and the weight of the cycloid pump are smaller.
The closed hydraulic system provided by the invention comprises the cycloid pump, and the power density of the closed pump is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Figure 1 is an exploded view of a gerotor pump provided in an embodiment of the present invention;
figure 2 is a cross-sectional view of a gerotor pump provided in an embodiment of the present invention;
FIG. 3 is a schematic view of the meshing of the inner rotor, common rotor and outer rotor provided by an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a rear cover according to an embodiment of the present invention;
FIG. 5 is a first cross-sectional view of a rear cover provided in accordance with an embodiment of the present invention;
FIG. 6 is a second cross-sectional view of the rear cover provided in accordance with an embodiment of the present invention;
FIG. 7 is a schematic structural view of a common rotor provided in accordance with an embodiment of the present invention;
FIG. 8 is a schematic structural view of a drive shaft provided in accordance with an embodiment of the present invention;
fig. 9 is a graph of the relationship between the flow rate of the inner high-pressure oil discharge cavity of the inner pump, the flow rate of the outer high-pressure oil discharge cavity, and the flow rate of the oil outlet of the gerotor pump and the time, provided by the embodiment of the invention.
In the figure:
1. an inner rotor; 11. an oil discharge channel; 2. a common rotor; 21. a slot; 22. internal teeth; 23. an outer tooth; 24. a first mounting hole; 3. an outer rotor;
4. a rear cover; 41. an inner low pressure arc oil passage; 42. an outer low pressure arc oil passage; 43. an inner high-pressure arc oil passage; 44. an outer high pressure arc oil passage; 45. a low pressure communicating oil passage; 46. a high pressure communicating oil passage;
5. a drive shaft; 51. an oil drainage channel; 52. a plug-in part; 53. an internal spline; 54. a second mounting hole; 55. a sealing groove; 6. a first bearing; 7. a second bearing; 8. an eccentric ring.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
As shown in fig. 1 to 3, the present embodiment provides a gerotor pump and a closed hydraulic system, wherein the closed hydraulic system includes a gerotor pump and a closed pump, and the gerotor pump is used for supplying oil to the closed pump to supply oil leakage of the closed hydraulic system.
The cycloid pump comprises a shell provided with an oil inlet and an oil outlet, and an inner rotor 1, a common rotor 2 and an outer rotor 3 which are rotatably arranged in the shell and are sleeved from inside to outside in sequence; the common rotor 2 and the outer rotor 3 are engaged with each other to form an outer pump, and two ends of the outer pump are sealed by a shell to form an outer low-pressure oil suction cavity and an outer high-pressure oil discharge cavity; the common rotor 2 and the inner rotor 1 are engaged with each other to form an inner pump, and two ends of the inner pump are sealed by the shell to form an inner low-pressure oil suction cavity and an inner high-pressure oil discharge cavity; the oil inlet is communicated with both the outer low-pressure oil suction cavity and the inner low-pressure oil suction cavity, and the oil outlet is communicated with both the outer low-pressure oil discharge cavity and the inner high-pressure oil discharge cavity.
Specifically, the oil inlet is communicated with the outer low-pressure oil suction cavity, and the oil outlet is communicated with the outer high-pressure oil discharge cavity; the shell is provided with a low-pressure oil duct which is communicated with the outer low-pressure oil suction cavity and the inner low-pressure oil suction cavity, and a high-pressure oil duct which is communicated with the outer high-pressure oil discharge cavity and the inner high-pressure oil discharge cavity.
In the embodiment, the working oil is introduced into the outer low-pressure oil suction cavity by the oil inlet, part of the working oil is conveyed to the outer high-pressure oil discharge cavity from the outer low-pressure oil suction cavity due to the rotary engagement of the common rotor 2 and the outer rotor 3, part of the working oil in the outer low-pressure oil suction cavity is introduced into the inner low-pressure oil suction cavity, the working oil in the inner low-pressure oil suction cavity is conveyed to the inner high-pressure oil discharge cavity due to the rotary engagement of the common rotor 2 and the inner rotor 1, and the working oil in the inner high-pressure oil discharge cavity converges into the outer high-pressure oil discharge cavity and merges with the working oil in the outer high-pressure oil discharge cavity, and is finally discharged from the oil outlet.
In other embodiments, the oil inlet can be communicated with the inner low-pressure oil suction cavity, and part of the working oil in the inner low-pressure oil suction cavity is distributed to the outer low-pressure oil suction cavity; the oil outlet can be communicated with the inner high-pressure oil discharge cavity, and the working oil in the outer high-pressure oil discharge cavity is converged into the inner high-pressure oil discharge cavity; the oil inlet can also be directly communicated with the inner low-pressure oil suction cavity and the outer low-pressure oil suction cavity at the same time.
The cycloid pump that this embodiment provided is simple, compact, and the oil discharge of with the inner pump is discharged from the oil-out after the oil discharge of outer pump merges, has increased the discharge capacity of cycloid pump, compares ordinary cycloid pump, and the cycloid pump of same discharge capacity, the volume and the weight of cycloid pump are less, have improved the power density of closed pump.
Further, the housing comprises a rear cover 4 and a front cover body which is hermetically connected with the rear cover and encloses a mounting cavity, and the inner rotor 1, the common rotor 2 and the outer rotor 3 are all arranged in the mounting cavity. In this embodiment, for a gerotor pump applied to a closed pump, the front cover body is a rear end cover of the closed pump. In order to ensure the sealing performance between the rear cover 4 and the rear end cover, a sealing ring, such as an O-ring, is arranged between the rear cover 4 and the rear end cover, so as to prevent oil leakage at the connecting position between the rear cover 4 and the rear end cover.
Further, as shown in fig. 4 to 6, the low-pressure oil passage includes an inner low-pressure arc oil passage 41, an outer low-pressure arc oil passage 42, and a low-pressure communication oil passage 45 provided on the rear cover 4, wherein the inner low-pressure arc oil passage 41 is communicated with the inner low-pressure oil suction chamber, the outer low-pressure arc oil passage 42 is communicated with the outer low-pressure oil suction chamber, the outer low-pressure arc oil passage 42 is communicated with the oil inlet, one end of the low-pressure communication oil passage 45 is communicated with the inner low-pressure arc oil passage 41, and the other end is communicated with the outer low-pressure arc oil passage 42. Part of the working oil in the outer low-pressure oil suction cavity sequentially passes through the outer low-pressure arc-shaped oil passage 42, the low-pressure communication oil passage 45, the inner low-pressure arc-shaped oil passage 41 and the inner low-pressure oil suction cavity.
Further, the high-pressure oil ducts include an inner high-pressure arc-shaped oil duct 43, an outer high-pressure arc-shaped oil duct 44 and a high-pressure communication oil duct 46 which are arranged on the rear cover 4, the inner high-pressure arc-shaped oil duct 43 is communicated with the inner high-pressure oil discharge cavity, the outer high-pressure arc-shaped oil duct 44 is communicated with the outer high-pressure oil discharge cavity, one end of the high-pressure communication oil duct 46 is communicated with the inner high-pressure arc-shaped oil duct 43, and the other end of the high-pressure communication oil duct is communicated with the outer high-pressure arc-shaped oil duct 44. The working oil in the inner high-pressure oil discharge cavity sequentially passes through the inner high-pressure arc-shaped oil passage 43, the high-pressure communication oil passage 46 and the outer high-pressure arc-shaped oil passage 44 to be merged with the working oil in the outer high-pressure oil discharge cavity.
Further, as shown in fig. 2, 7 and 8, the common rotor 2 is connected with the driving shaft 5, specifically, one side of the common rotor 2 is provided with a slot 21, one end of the driving shaft 5 is provided with a plug-in part 52, and the plug-in part 52 is in plug-in fit with the slot 21 to realize the positioning between the common rotor 2 and the driving shaft 5. As shown in fig. 1, 5 and 6, the common rotor 2 and the driving shaft 5 are connected by a plurality of fastening members such as screws, bolts, etc. arranged circumferentially, specifically, the bottom wall of the slot 21 is provided with a plurality of first mounting holes 24 arranged circumferentially, the socket part 52 is provided with second mounting holes 54 corresponding to the first mounting holes 24 one by one, the common rotor 2 is connected to the driving shaft 5 by a plurality of fastening members, the driving shaft 5 rotates, the common rotor 2 and the inner rotor 1 are meshed to rotate, and the common rotor 2 and the outer rotor 3 are meshed to rotate at the same time.
The other end of the driving shaft 5 is provided with an internal spline 53, and the internal spline 53 is connected with a closed pump, so that the closed pump and the cycloid pump are driven by the same power source.
The inner rotor 1 is rotatably connected with the rear cover 4 through a first bearing 6, and the driving shaft 5 is rotatably connected with the rear cover through a second bearing 7. Preferably, two second bearings 7 are provided, and two second bearings 7 are provided at both ends of the drive shaft 5. In the present embodiment, the first bearing 6 and the second bearing 7 are both sliding bearings.
Further, an eccentric ring 8 connected with the outer casing is arranged in the outer casing, and the outer rotor 3 is sleeved with the eccentric ring 8, so that the outer rotor 3 can only rotate around the axis of the outer rotor 3. In this embodiment, the eccentric ring 8 and the rear cover 4 are separately arranged, so that the machining precision of the eccentric ring 8 is improved, and the eccentric distance between the eccentric ring 8 and the common rotor 2 is more accurately set. In other embodiments, the eccentric ring 8 and the rear cover 4 may be integrally formed, but this increases the processing cost of the rear cover 4 and reduces the processing precision.
Further, a sealing element is arranged between the driving shaft 5 and the public rotor 2, and is used for separating an inner low-pressure oil suction cavity and an outer low-pressure oil suction cavity at one end, connected with the driving shaft 5, of the public rotor 2 from the inner high-pressure oil discharge cavity and the outer high-pressure oil discharge cavity, so that oil leakage between the inner pump and the outer pump is effectively prevented. Specifically, one end of the insertion portion 52 is provided with a sealing groove 55, a sealing element is arranged in the sealing groove 55, and the sealing element is a sealing ring having a sealing function, such as an O-ring.
Further, a drain passage 51 is provided in the drive shaft 5, and an oil discharge passage 11 communicating with the drain passage 51 is provided in the inner rotor 1. The oil drainage channel 51 is communicated with an oil tank in the closed hydraulic system to prevent local high pressure from occurring in the cycloid pump and carry out pressure relief protection.
Furthermore, the inner wall of the common rotor 2 is provided with inner teeth 22 meshed with the inner rotor 1, and the outer wall of the common rotor 2 is provided with outer teeth 23 meshed with the outer rotor 3; the number of teeth of internal tooth 22 equals the number of teeth +1 of inner rotor 1, and the number of teeth of external tooth 23 equals the number of teeth-1 of outer rotor 3, and the number of teeth of internal tooth 22 equals the number of teeth of outer rotor 3, and the number of teeth of inner rotor 1 equals the number of teeth of external tooth 23.
By adopting the arrangement, the flow pulsation wave crest times and the flow pulsation wave trough times of the inner pump and the outer pump in the same period are ensured to be the same, namely the pulsation frequency is the same.
Further, as shown in FIG. 9, Q Outer cover Is the flow rate of the outer high-pressure oil discharge cavity of the outer pump, Q Inner part Is the flow rate of the inner high-pressure oil discharge cavity of the inner pump, Q Combination of Chinese herbs Is the flow rate of the outlet of the gerotor pump, the crest midpoint of any one of the outer teeth 23 startsThe angle and the root midpoint starting angle of the internal teeth 22 adjacent thereto are offset by an angle of 2 pi/number of teeth of the outer rotor. By adopting the arrangement, the wave crest time point of the outer pump is ensured to coincide with the wave trough time point of the inner pump, the wave trough time point of the outer pump is ensured to coincide with the wave crest time point of the inner pump, and the flow pulsation when the working oil in the inner high-pressure oil discharge cavity and the working oil in the outer high-pressure oil discharge cavity converge can be counteracted to the maximum extent, so that the flow pulsation of the cycloid pump is reduced; and the displacement of the inner pump and the displacement of the outer pump are not interfered with each other.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (6)
1. A cycloid pump is characterized by comprising a shell provided with an oil inlet and an oil outlet, and an inner rotor (1), a common rotor (2) and an outer rotor (3) which are rotatably arranged in the shell and are sleeved from inside to outside in sequence;
the common rotor (2) and the outer rotor (3) are in differential tooth meshing to form an outer pump, and two ends of the outer pump are sealed by the shell to form an outer low-pressure oil suction cavity and an outer high-pressure oil discharge cavity; the common rotor (2) is meshed with the inner rotor (1) in a differential gear manner to form an inner pump, and two ends of the inner pump are sealed by the shell to form an inner low-pressure oil suction cavity and an inner high-pressure oil discharge cavity;
the oil inlet is communicated with both the outer low-pressure oil suction cavity and the inner low-pressure oil suction cavity, and the oil outlet is communicated with both the outer high-pressure oil discharge cavity and the inner high-pressure oil discharge cavity;
the oil inlet is communicated with the outer low-pressure oil suction cavity, and the oil outlet is communicated with the outer high-pressure oil discharge cavity;
the shell is provided with a low-pressure oil duct which communicates the outer low-pressure oil suction cavity with the inner low-pressure oil suction cavity, and a high-pressure oil duct which communicates the outer high-pressure oil discharge cavity with the inner high-pressure oil discharge cavity;
the inner high-pressure oil discharge cavity is communicated with the oil outlet through the outer high-pressure oil discharge cavity, and the oil inlet is communicated with the inner low-pressure oil suction cavity through the outer low-pressure oil suction cavity;
the inner wall of the public rotor (2) is provided with inner teeth (22) meshed with the inner rotor (1), and the outer wall of the public rotor (2) is provided with outer teeth (23) meshed with the outer rotor (3);
the number of teeth of the inner teeth (22) = the number of teeth of the inner rotor (1) +1, the number of teeth of the outer teeth (23) = -1, the number of teeth of the inner teeth (22) equals the number of teeth of the outer rotor (3), the number of teeth of the inner rotor (1) equals the number of teeth of the outer teeth (23), the gerotor pump further comprises a drive shaft (5) connected with the common rotor (2); one side of the public rotor (2) is provided with a slot (21), one end of the driving shaft (5) is provided with an inserting part (52), and the inserting part (52) is inserted and matched with the slot (21) so as to realize the positioning between the public rotor (2) and the driving shaft (5).
2. The gerotor pump of claim 1, wherein the low-pressure gallery includes, on the housing:
an inner low pressure arc oil passage (41) communicated with the inner low pressure oil suction chamber;
an outer low pressure arc oil passage (42) communicating with the outer low pressure suction chamber;
and one end of the low-pressure communication oil passage (45) is communicated with the inner low-pressure arc-shaped oil passage (41), and the other end of the low-pressure communication oil passage is communicated with the outer low-pressure arc-shaped oil passage (42).
3. The gerotor pump of claim 1, wherein the high-pressure gallery includes, on the housing:
an inner high-pressure arc oil passage (43) communicated with the inner high-pressure oil suction cavity;
an outer high pressure arc oil passage (44) communicating with the outer high pressure suction chamber;
and one end of the high-pressure communication oil passage (46) is communicated with the inner high-pressure arc-shaped oil passage (43), and the other end of the high-pressure communication oil passage is communicated with the outer high-pressure arc-shaped oil passage (44).
4. The gerotor pump according to claim 2 or 3, characterized in that a seal is provided between the drive shaft (5) and the common rotor (2) separating the inner low-pressure suction chamber and the inner high-pressure discharge chamber at the end of the common rotor (2) connected to the drive shaft (5) from the outer low-pressure suction chamber and the outer high-pressure discharge chamber.
5. The gerotor pump of claim 1, characterized in that the inner rotor (1) is rotationally connected to the housing by means of a first bearing (6);
and/or the driving shaft (5) is rotationally connected with the shell through a second bearing (7);
and/or an eccentric ring (8) connected with the shell is arranged in the shell, and the eccentric ring (8) is sleeved outside the outer rotor (3) to enable the outer rotor (3) to rotate only around the axis of the outer rotor.
6. Closed hydraulic system, characterized in that it comprises a gerotor pump according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010610793.4A CN111734623B (en) | 2020-06-29 | 2020-06-29 | Cycloid pump and closed hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010610793.4A CN111734623B (en) | 2020-06-29 | 2020-06-29 | Cycloid pump and closed hydraulic system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111734623A CN111734623A (en) | 2020-10-02 |
| CN111734623B true CN111734623B (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010610793.4A Active CN111734623B (en) | 2020-06-29 | 2020-06-29 | Cycloid pump and closed hydraulic system |
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| CN (1) | CN111734623B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003314465A (en) * | 2002-04-22 | 2003-11-06 | Nippon Jii Rotor Kk | Oil pump apparatus |
| JP4028777B2 (en) * | 2002-07-29 | 2007-12-26 | 株式会社山田製作所 | Trochoid pump |
| US8714951B2 (en) * | 2011-08-05 | 2014-05-06 | Ener-G-Rotors, Inc. | Fluid energy transfer device |
| CN203215234U (en) * | 2013-02-22 | 2013-09-25 | 浙江吉利汽车研究院有限公司杭州分公司 | Tri-rotor engine oil pump |
| CN109827059A (en) * | 2019-01-23 | 2019-05-31 | 浙江零跑科技有限公司 | A kind of cycloid gear pump of two-way fuel feeding |
-
2020
- 2020-06-29 CN CN202010610793.4A patent/CN111734623B/en active Active
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| Publication number | Publication date |
|---|---|
| CN111734623A (en) | 2020-10-02 |
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Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee after: WEICHAI POWER Co.,Ltd. Patentee after: Weichai Hydraulic Transmission Co.,Ltd. Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: WEICHAI POWER Co.,Ltd. Patentee before: LINDE HYDRAULICS (CHINA) Co.,Ltd. |