CN114183678A - Variable displacement oil pump - Google Patents

Abstract

The invention relates to a variable displacement oil pump, wherein oil flows between a housing and a driving gear of the oil pump, and a driving shaft is sleeved in the driving gear between the shell and the driven gear, the driving shaft penetrates through the shell to be connected with a driving machine, the driving gear and the driven gear are arranged on the adjusting column, the adjusting column is matched with the inner wall of the shell, the adjusting column slides along the inner wall of the shell in the axial direction, so that the driving gear and the driven gear are displaced to be separated from the oil suction cavity and the oil discharge cavity, therefore, the outer wall of the adjusting column can be gradually plugged into the oil suction cavity and the oil discharge cavity, stepped shafts are arranged at two ends of the adjusting column and are inserted into two ends of the shell, a rotatable centrifugal conveying structure is arranged at one end of the adjusting column, the conveyed centrifugal conveying structure is communicated with the oil suction cavity and the oil discharge cavity through a centrifugal oil conveying channel of the shell, and a buffer spring is arranged between the stepped shaft at the other end of the adjusting column and the shell. The invention guarantees torsional strength, and can achieve the purpose of variable displacement without sacrificing strength or rigidity through an eccentric structure.

Description

Variable displacement oil pump

Technical Field

The invention relates to the field of oil pumps, in particular to a variable-displacement oil pump.

Background

When the engine speed is low, the oil discharge is small, lubrication is easy to be insufficient, and when the engine speed is high, the oil discharge is too high, so that power waste is caused. In the prior art, chinese utility model patent publication No. CN203797312U discloses a variable displacement oil pump, which includes a pump body and a pump cover that are matched with each other, the pump body is provided with a working chamber, an adjusting ring is arranged in the working chamber, and the adjusting ring is hinged with the pump body; be equipped with first arch on the adjusting ring excircle, first arch can be along with the adjusting ring along work intracavity wall circumference slip, a bellied circumference side is connected with adjustment mechanism, adjustment mechanism includes two guide rod bolts, guide rod bolt one side tip fixed connection is on the work intracavity wall, the clearance has between guide rod bolt opposite side tip and the first arch, the cover is equipped with first regulating spring and the second regulating spring that length differs on two guide rod bolts respectively, the tip top of first regulating spring is on first arch, the tip of second regulating spring has the space with first arch. It reduces the oil mass through adjusting radial eccentric distance, and it is eccentric to make torsional strength reduce, and the adjustable ring atress is uneven fragile.

Disclosure of Invention

The invention aims to provide a variable displacement oil pump which can guarantee torsional strength and achieve the purpose of variable displacement without sacrificing strength or rigidity through an eccentric structure.

In order to achieve the above object, a variable displacement oil pump is used, in which oil flows between an inner wall of a housing of the oil pump and a drive gear, and a driving shaft is sleeved in the driving gear between the inner wall of the shell and the driven gear, the driving shaft penetrates through the shell to be connected with a driving machine, the driving gear and the driven gear are arranged on the adjusting column, the adjusting column is matched with the inner wall of the shell, the adjusting column slides along the inner wall of the shell in the axial direction, so that the driving gear and the driven gear are displaced to be separated from the oil suction cavity and the oil discharge cavity, therefore, the outer wall of the adjusting column can gradually block the oil suction cavity and the oil discharge cavity, one end of the adjusting column is provided with a stepped shaft inserted into one end of the shell, a rotatable centrifugal conveying structure is arranged in one end part of the adjusting column, the conveyed centrifugal conveying structure is communicated with the oil suction cavity and the oil discharge cavity through a centrifugal oil conveying channel of the shell, and a buffer spring is arranged between the stepped shaft of the adjusting column and the end part of the shell.

The driving shaft is erected in the adjusting columns at two ends of the driving gear through two bearings and moves along with the adjusting columns, and the driven shaft of the driven gear can also be connected in the adjusting columns at two ends of the driven gear through bearings and moves along with the adjusting columns. Thrust bearings may be used to prevent the driving and driven shafts from moving axially.

The structure of the gear type oil pump is characterized in that the rotation of the driving gear and the driven gear causes the oil in the oil suction cavity to flow through the main oil duct formed by the gap between the gear and the shell and then flow into the oil discharge cavity, different from the prior art, when the oil pressure in the oil pump is too large, the adjusting column extrudes the buffer spring to form axial movement, so that the driving gear and the driven gear can be driven to separate from the oil suction cavity and the oil discharge cavity, the outer wall of the adjusting column is sealed to block the main oil duct which is the oil suction cavity and the oil discharge cavity, so that the driving gear and the driven gear can not suck oil any more, at the moment, the centrifugal conveying structure is started to rotate, after the centrifugal oil conveying channel is communicated with the centrifugal conveying structure, an auxiliary oil duct is formed, the oil can be continuously conveyed by the centrifugal conveying structure, the inner diameter of the centrifugal oil conveying channel and the oil storage capacity of the centrifugal conveying structure are adjusted, the amount of the conveyed oil can be reduced, and the oil pressure in the oil pump is reduced, after the oil pressure in the oil pump is reduced, the buffer spring enables the driving gear and the driven gear to return to the original positions to continue to convey oil by using the main oil duct.

As a further improvement of the variable displacement oil pump, the centrifugal oil conveying channel comprises a first centrifugal oil channel adjacent to the oil suction cavity, and the first centrifugal oil channel is communicated with the oil suction cavity through a second centrifugal oil channel axially extending along the adjusting column.

By adopting the structure, the first centrifugal oil channel is radial, the second centrifugal oil channel is axial, and the engine oil enters the radial first centrifugal oil channel along the axial second centrifugal oil channel.

As a further improvement of the variable displacement oil pump, the centrifugal conveying structure comprises a radial groove, the radial groove extends into the first centrifugal oil duct, an opening communicated with the second centrifugal oil duct is formed in the radial groove, the radial groove is formed in the edge part of the centrifugal wheel in the radial direction, the centrifugal wheel is driven by a centrifugal shaft, after the centrifugal wheel rotates, engine oil flowing into the radial groove is conveyed to the oil discharge cavity through centrifugal force, and the centrifugal shaft penetrates through the adjusting column and the shell to be connected with the motor.

By adopting the structure, the radial groove can store the engine oil, the position of the engine oil close to the oil suction cavity is transferred to the position close to the oil discharge cavity by rotating, and then the engine oil is thrown out by centrifugal force to finish the centrifugal conveying of the engine oil. The radial groove can be provided with a centrifugal hole along the circumferential side surface of the centrifugal wheel in the radial direction, the centrifugal hole is sealed in the bottom wall of the first centrifugal oil channel, and when the radial groove is close to the oil discharge cavity, the radial groove is communicated with a corresponding channel for oil transportation. The radial groove can be provided with an inclined plane, so that the engine oil can be more conveniently thrown out of the centrifugal wheel through centrifugal force, such as a sharp groove, a triangular groove or a trapezoidal groove, and the inclined plane angle which is beneficial to the form of engine oil discharge can be arranged.

As a further improvement of the variable displacement oil pump, the centrifugal wheel is annular, trapezoidal grooves are uniformly distributed on the inner peripheral surface of the centrifugal wheel at intervals, each trapezoidal groove is provided with two opposite inclined surfaces and two opposite straight surfaces, the opposite inclined surfaces extend towards the outer diameter of the centrifugal wheel in the radial direction and approach each other, a butting wheel is fixedly connected to the centrifugal shaft to be butted with the centrifugal wheel, telescopic trapezoidal blocks are uniformly arranged on the outer peripheral surface of the butting wheel and are matched with the trapezoidal grooves, the telescopic trapezoidal blocks can contract and move towards the containing grooves circumferentially distributed on the butting wheel in the radial direction of the butting wheel, a telescopic spring is arranged between the bottom of the containing groove and the butting wheel, and the butting wheel is rotatably connected to the adjusting column.

By adopting the structure, the centrifugal wheel is limited by the first centrifugal oil duct to not move axially when rotating, the butt joint wheel can be in butt joint with the centrifugal wheel when moving axially along with the adjusting column, when in butt joint, the telescopic trapezoidal block on the butt joint wheel extends into the trapezoidal groove of the centrifugal wheel, when rotating, the telescopic trapezoidal block contacts with a straight surface in the circumferential direction to drive the centrifugal wheel to rotate, and when moving axially, the telescopic trapezoidal block contacts with an inclined surface to slide out of the trapezoidal groove, the centrifugal wheel is influenced by friction force and can be stopped gradually, the state of the adjusting column is convenient to respond, and real-time adjustment of oil pressure is facilitated, and the telescopic trapezoidal block can pop out of the accommodating groove by the telescopic spring so as to be inserted into the trapezoidal groove and can be allowed to retract so as to move out of the trapezoidal groove.

As a further improvement of the variable displacement oil pump, the centrifugal shaft comprises a first centrifugal shaft body and a second centrifugal shaft body, one end of the first centrifugal shaft body penetrates through the adjusting column and the shell in a sliding mode to be connected with the motor, the other end of the first centrifugal shaft body can axially and slidably extend into the second centrifugal shaft body to be fixedly sleeved with the pinion, the pinion is matched with a tooth cavity in one end of the second centrifugal shaft body, the tooth cavity is longer than the pinion in axial length, the second centrifugal shaft body is connected with the adjusting column through a bearing, and the bearing enables the second centrifugal shaft body and the adjusting column to rotate relatively but not to move axially relatively.

Adopt such structure motor to make first centrifugal axle body rotate to drive second centrifugal axle body and rotate, the pinion can make axial relative movement in the tooth chamber, thereby adjusts the post along with oil pressure and buffer spring's effect, and during axial displacement, axial displacement can not take place for first centrifugal axle body, thereby the influence is sealed, further promotes sealed effect.

As a further improvement of the variable displacement oil pump, a circle of first sealing ring is arranged on the peripheral surface of the centrifugal wheel, and a circle of second sealing ring is also arranged on the joint part of the shell and the centrifugal wheel.

With this structure, the oil can be prevented from leaking in the radial direction of the centrifugal wheel.

As a further improvement of the variable displacement oil pump, the oil discharge cavity is communicated with a first oil pressure cavity, the first oil pressure cavity is formed by a space between an oil pressure groove in the shell and a radial ring on the adjusting column, the oil pressure groove is slidably connected with the radial ring, and the radial ring is provided with a corresponding liquid seal to prevent the oil leakage of the oil pressure groove.

When the structure is adopted, when the oil pressure at the oil discharge cavity is high, the adjusting column can axially move through the oil pressure, so that the oil discharge cavity and the oil suction cavity are gradually blocked.

As a further improvement of the variable displacement oil pump, the oil suction cavity is communicated with a second oil pressure cavity, and the second oil pressure cavity is formed by a space between the other oil pressure groove of the shell and a radial ring on the adjusting column.

By adopting the structure, when the pressure of the oil suction cavity is high, the adjusting column can axially move through the oil pressure, so that the oil discharge cavity and the oil suction cavity are gradually blocked.

As a further improvement of the variable displacement oil pump, oil pressure sensors are arranged in the first oil pressure cavity and the second oil pressure cavity, and the oil pressure sensors are electrically connected with the motor.

The motor can be controlled by the oil pressure sensor to drive the centrifugal wheel to work so as to convey lubricating oil, so that electric energy can be saved, and the motor does not need to be started all the time.

As a further improvement of the variable displacement oil pump, two oil pressure lugs are arranged on the radial ring and respectively extend into the first oil pressure cavity and the second oil pressure cavity to clamp an oil pressure groove, and the oil pressure sensor is arranged on the oil pressure lugs.

The concave piece of oil pressure can increase the atress, and the oil pressure concentrates on in the concave part for radial ring atress is more obvious, makes the regulation post when the oil pressure is high, takes place axial displacement faster, with the reduction oil mass, adjusts the oil pressure.

The invention can ensure torsional strength and can achieve the purpose of variable displacement without sacrificing strength or rigidity through an eccentric structure. The variable-displacement oil pump can optimize the oil displacement according to the oil pressure requirement and the friction requirement, so that the aim of accurately controlling a lubricating system is fulfilled, and meanwhile, the power loss of the oil pump is reduced. The oil quantity of the main oil duct is changed through the axial movement of the adjusting column, so that the discharge capacity of the oil pump is changed, when the pressure of feedback oil reaches a variable set value, the spring is compressed, the adjusting column moves axially, the oil quantity of the main oil duct is reduced in the operation process of the oil pump, so that the flow of the oil pump is reduced, and meanwhile, the limit of oil quantity reduction is guaranteed through the centrifugal conveying structure, so that the oil supplementing effect is achieved; when the pressure of the feedback engine oil is reduced, the spring gradually returns to enable the adjusting column to return.

Drawings

Fig. 1 is a sectional structure diagram of the present embodiment.

Fig. 2 is an exploded view of the shell of the present embodiment.

FIG. 3 is a schematic view of a centrifugal shaft structure.

FIG. 4 is a schematic view of an oil pressure groove structure.

Fig. 5 is a sectional structure diagram in a centrifugal oil transportation state.

Reference numerals: 1. an oil pump; 2. a housing; 3. an oil pressure projection; 4. a driving gear; 5. a driven gear; 6. an adjustment column; 7. a drive shaft; 8. an oil suction cavity; 9. an oil discharge cavity; 10. a stepped shaft; 11. a centrifugal conveying structure; 12. a centrifugal oil transfer channel; 13. a first centrifugal oil passage; 14. a radial slot; 15. a centrifugal wheel; 16. a centrifugal shaft; 17. a motor; 18. an inner peripheral surface; 19. a trapezoidal groove; 20. a docking wheel; 21. a telescopic trapezoidal block; 22. accommodating grooves; 23. a tension spring; 24. a first centrifugal shaft body; 25. a driver; 26. a second centrifugal shaft body; 27. a pinion gear; 28. a tooth chamber; 29. a bearing; 30. a first seal ring; 31. a second seal ring; 32. a first oil pressure chamber; 33. a second oil pressure chamber; 34. a radial ring; 35. an oil pressure sensor; 36. an oil pressure tank; 37. a buffer spring; 38. a second centrifugal oil gallery.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope 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; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; 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.

As shown in fig. 1-5, a variable displacement oil pump, wherein the oil flows between the inner wall of the housing 2 and the driving gear 4 of the oil pump 1, and between the inner wall of the housing 2 and the driven gear 5, the driving gear 4 is sleeved with the driving shaft 7, the driving shaft 7 penetrates the housing 2 and is connected with the driving machine 25, the driving gear 4 and the driven gear 5 are mounted on the adjusting column 6, the adjusting column 6 is adapted to the inner wall of the housing 2, the adjusting column 6 slides axially along the inner wall of the housing 2, so that the driving gear 4 and the driven gear 5 are displaced to separate from the oil suction chamber 8 and the oil discharge chamber 9, so that the outer wall of the adjusting column 6 can gradually block the oil suction chamber 8 and the oil discharge chamber 9, one end of the adjusting column 6 is provided with a stepped shaft 10 inserted into one end of the housing 2, a rotatable centrifugal conveying structure 11 is arranged in one end of the adjusting column 6, the conveyed centrifugal conveying structure 11 communicates the oil suction chamber 8 and the oil discharge chamber 9 through a centrifugal oil conveying passage 12 in the housing 2, a buffer spring 37 is arranged between the stepped shaft 10 of the adjusting column 6 and the end part of the shell 2.

In this embodiment, in the structure of the gear-type oil pump, the rotation of the driving gear 4 and the driven gear 5 causes the oil in the oil suction chamber 8 to flow through the main oil passage formed by the gap between the gear and the housing 2 and then flow into the oil discharge chamber, unlike the prior art, when the oil pressure in the oil pump is too high, the adjusting column 6 presses the buffer spring 37 to move axially, so as to drive the driving gear 4 and the driven gear 5 to separate from the oil suction chamber 8 and the oil discharge chamber 9, so that the outer wall of the adjusting column 6 blocks the main oil passage which is the oil suction chamber 8 and the oil discharge chamber 9, so that the driving gear 4 and the driven gear 5 can not suck oil any more, at this time, the centrifugal conveying structure 11 is started to rotate, after the centrifugal oil conveying channel 12 is communicated with the centrifugal conveying structure 11, the centrifugal conveying structure 11 can continue to convey oil, and adjust the inner diameter of the centrifugal oil conveying channel and the oil storage capacity of the centrifugal conveying structure 11, the amount of the oil to be transported can be reduced, so that the oil pressure in the oil pump is reduced, and after the oil pressure in the oil pump is reduced, the driving gear 4 and the driven gear 5 return to the original positions by the buffer spring 37 to continue transporting oil by the main oil gallery. The oil delivery volume of the centrifugal channel is less than that of the main oil gallery, and the oil delivery channel can be changed in size and centrifugal speed, so that the purpose of variable displacement is further achieved.

In the present embodiment, the centrifugal oil delivery channel 12 comprises a first centrifugal oil channel 13 adjacent to the oil suction chamber 8, and the first centrifugal oil channel 13 communicates with the oil suction chamber 8 via a second centrifugal oil channel 38 extending axially along the adjustment post 6.

With this structure, the first centrifugal oil passage 13 is radial, the second centrifugal oil passage 38 is axial, and the engine oil enters the radial first centrifugal oil passage 13 along the axial second centrifugal oil passage 38.

In this embodiment, the centrifugal conveying structure 11 includes a radial groove 14, the radial groove 14 extends into the first centrifugal oil channel 13, the radial groove 14 is opened to communicate with the second centrifugal oil channel 38, the radial groove 14 is disposed on a radial edge portion of the centrifugal wheel 15, the centrifugal wheel 15 is driven by the centrifugal shaft 16, the centrifugal shaft 16 rotates to transport the engine oil flowing into the radial groove 14 to the oil discharge cavity 9 by centrifugal force, and the centrifugal shaft 16 passes through the adjusting column 6 and the housing 2 to connect with the motor 17.

By adopting the structure, the radial groove 14 can store the engine oil, the position of the engine oil close to the oil suction cavity 8 is transferred to the position close to the oil discharge cavity 9 by rotating, and then the engine oil is thrown out by centrifugal force to finish the centrifugal conveying of the engine oil. The radial groove 14 may be provided with a centrifugal hole along a circumferential side surface of the centrifugal wheel 15 in the radial direction, the centrifugal hole is closed in a bottom wall of the first centrifugal oil passage 13, and when the radial groove is close to the oil discharge chamber 9, the radial groove is communicated with a corresponding passage for oil transportation.

In this embodiment, the centrifugal wheel 15 is annular, trapezoidal grooves 19 are uniformly distributed on an inner peripheral surface 18 of the centrifugal wheel at intervals, each trapezoidal groove 19 has two opposite inclined surfaces and two opposite straight surfaces, the opposite inclined surfaces extend outward from the centrifugal wheel 15 in the radial direction and approach each other, a docking wheel 20 is fixedly connected to the centrifugal shaft 16 to dock the centrifugal wheel 15, telescopic trapezoidal blocks 21 are uniformly arranged on the outer peripheral surface of the docking wheel 20, the telescopic trapezoidal blocks 21 are matched with the trapezoidal grooves 19, the telescopic trapezoidal blocks 21 can radially contract and move towards accommodating grooves 22 circumferentially distributed on the docking wheel 20 along the docking wheel 20, a telescopic spring 23 is arranged between the bottom of the accommodating grooves 22 and the docking wheel 20, and the docking wheel 20 is rotatably connected to the adjusting column 6.

By adopting the structure, the centrifugal wheel 15 is limited by the first centrifugal oil channel 13 to be incapable of axially moving when rotating, the butt joint wheel 20 can be in butt joint with the centrifugal wheel 15 when axially moving along with the adjusting column 6, the telescopic trapezoidal block 21 on the butt joint wheel 20 extends into the trapezoidal groove 19 of the centrifugal wheel 15 when in butt joint, the telescopic trapezoidal block 21 is in contact with a straight surface in the circumferential direction when rotating, the centrifugal wheel 15 can be driven to rotate, and the telescopic trapezoidal block 21 can slide out of the trapezoidal groove 19 when being in contact with an inclined surface when the adjusting column 6 axially moves, the centrifugal wheel 15 is influenced by friction force and can be gradually stopped, the state of the adjusting column is conveniently responded, the real-time adjustment of oil pressure is facilitated, the telescopic spring 23 enables the telescopic trapezoidal block 21 to pop out of the accommodating groove 22 so as to be inserted into the trapezoidal groove 19, and the telescopic trapezoidal block 21 can be allowed to retract so as to be moved out of the trapezoidal groove 19.

In this embodiment, the centrifugal shaft 16 includes a first centrifugal shaft body 24 and a second centrifugal shaft body 26, one end of the first centrifugal shaft body 24 slidably passes through the adjusting column 6 and the housing 2 to connect with the motor 17, the other end of the first centrifugal shaft body 24 axially slidably extends into the second centrifugal shaft body 26 to fixedly sleeve a pinion 27, the pinion 27 is adapted to a tooth cavity 28 in one end of the second centrifugal shaft body 26, the tooth cavity 28 is longer than the pinion 27 in the axial direction, the second centrifugal shaft body 26 is connected with the adjusting column 6 through a bearing 29, and the bearing 29 enables the second centrifugal shaft body 26 to rotate relative to the adjusting column 6 without relative axial movement.

By adopting the structure, the motor 17 enables the first centrifugal shaft body 24 to rotate so as to drive the second centrifugal shaft body 26 to rotate, the pinion 27 can move axially and relatively in the tooth cavity 28, so that the adjusting column 6 can move axially along with the oil pressure and the buffer spring 37, and when the centrifugal shaft moves axially, the first centrifugal shaft body 24 cannot move axially, so that the sealing effect is influenced, and the sealing effect is further improved.

In this embodiment, a circle of the first sealing ring 30 is disposed on the outer peripheral surface of the centrifugal wheel 15, and a circle of the second sealing ring 31 is also disposed on the portion of the housing 2 attached to the centrifugal wheel 15.

With this structure, the oil can be prevented from leaking in the radial direction of the centrifugal wheel 15.

In this embodiment, the oil discharge chamber 9 is communicated with a first oil pressure chamber 32, the first oil pressure chamber 32 is formed by a space between an oil pressure groove 36 in the housing 2 and a radial ring 34 on the adjusting column 6, the oil pressure groove 36 is slidably connected to the radial ring 34, if a corresponding slot is formed on the radial ring 34 to extend the oil supply pressure groove 16, the oil pressure groove 16 is extended, the radial ring 34 drives the adjusting column 6 to press the buffer spring 37, so that the centrifugal wheel 15 can rotate to start centrifugal oil transportation, and a corresponding liquid seal is formed on the radial ring 34 to prevent oil leakage from the oil pressure groove 36.

When the structure is adopted, when the oil pressure at the oil discharge cavity 9 is high, the adjusting column 6 can axially move through the oil pressure, so that the oil discharge cavity 9 and the oil suction cavity 8 are gradually blocked.

In the present embodiment, the oil suction chamber 8 communicates with a second hydraulic chamber 33, and the second hydraulic chamber 33 is formed by a space between the other hydraulic groove 36 of the housing 2 and the radial ring 34 of the adjustment column 6.

With such a structure, when the pressure of the oil suction cavity 8 is high, the adjusting column 6 can axially move through the oil pressure, so that the oil discharge cavity 9 and the oil suction cavity 8 are gradually blocked.

In the present embodiment, a hydraulic sensor 35 is disposed between the first hydraulic chamber 32 and the second hydraulic chamber 33, and the hydraulic sensor 35 is electrically connected to the motor 17.

The motor 17 can be controlled by the oil pressure sensor 5 to drive the centrifugal wheel 15 to work so as to convey lubricating oil, so that electric energy can be saved, and the motor 17 does not need to be started all the time.

In this embodiment, two hydraulic pockets 3 are provided on the radial ring 34, which extend into the first hydraulic chamber 32 and the second hydraulic chamber 33, respectively, to press the hydraulic grooves 36, and the hydraulic sensor 35 is provided on the hydraulic projection 3.

The concave piece 3 of oil pressure can increase the atress, and the oil pressure concentrates on in the concave part for radial ring 34 atress is more obvious, makes and adjusts post 6 when the oil pressure is high, takes place axial displacement faster, with the reduction oil mass, adjusts the oil pressure.

As shown in fig. 5, during centrifugal oil transportation, the driving/driven wheel moves out of the oil suction cavity 6 and the oil discharge cavity 9, the adjusting column 6 blocks the oil suction cavity 6 and the oil discharge cavity 9, the engine oil of the driving/driven wheel can be stored in the shell and the adjusting column 6, a corresponding liquid seal can be arranged between the whole body of the adjusting column 6 and the shell to improve the oil storage effect, after the oil pressure is reduced, the driving/driven wheel is communicated with the oil suction cavity 6 and the oil discharge cavity 9 again, and the stored engine oil can achieve the effect of supplying oil in time.

The invention can ensure torsional strength and can achieve the purpose of variable displacement without sacrificing strength or rigidity through an eccentric structure.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.

Claims (10)

1. A variable displacement oil pump, wherein the engine oil flows between the inner wall of a shell (2) and a driving gear (4) of the oil pump (1) and between the inner wall of the shell (2) and a driven gear (5), the driving gear (4) is sleeved with a driving shaft (7), the driving shaft (7) penetrates out of the shell (2) to be connected with a driving machine (25), the variable displacement oil pump is characterized in that the driving gear (4) and the driven gear (5) are mounted on an adjusting column (6), the adjusting column (6) is matched with the inner wall of the shell (2), the adjusting column (6) axially slides along the inner wall of the shell (2) to enable the driving gear (4) and the driven gear (5) to displace so as to be separated from an oil suction cavity (8) and an oil discharge cavity (9), so that the outer wall of the adjusting column (6) can gradually block the oil suction cavity (8) and the oil discharge cavity (9), one end of the adjusting column (6) is provided with a stepped shaft (10) which is inserted into one end of the shell (2), a rotatable centrifugal conveying structure (11) is arranged in one end of the adjusting column (6), the conveyed centrifugal conveying structure (11) is communicated with the oil suction cavity (8) and the oil discharge cavity (9) through a centrifugal oil conveying channel (12) in the shell (2), and a buffer spring (37) is arranged between a stepped shaft (10) of the adjusting column (6) and the end of the shell (2).

2. A variable displacement oil pump according to claim 1, characterized in that the centrifugal oil feed passage (12) comprises a first centrifugal oil channel (13) adjacent to the oil suction chamber (8), the first centrifugal oil channel (13) communicating with the oil suction chamber (8) via a second centrifugal oil channel (38) extending axially along the adjustment post (6).

3. The variable displacement oil pump according to claim 2, wherein the centrifugal conveying structure (11) comprises a radial groove (14), the radial groove (14) extends into the first centrifugal oil channel (13), an opening is formed in the radial groove (14) and is communicated with the second centrifugal oil channel (38), the radial groove (14) is formed in the edge portion of the centrifugal wheel (15) in the radial direction, the centrifugal wheel (15) is driven by the centrifugal shaft (16), the centrifugal shaft (16) is rotated to enable the oil flowing into the radial groove (14) to be conveyed to the oil discharge cavity (9) through centrifugal force, and the centrifugal shaft (16) penetrates through the adjusting column (6) and the shell (2) to be connected with the motor (17).

4. The variable displacement oil pump according to claim 3, wherein the centrifugal wheel (15) is annular, trapezoidal grooves (19) are uniformly distributed on an inner circumferential surface (18) of the centrifugal wheel at intervals, the trapezoidal grooves (19) have two opposite inclined surfaces and two opposite straight surfaces, the opposite inclined surfaces extend towards the outer diameter of the centrifugal wheel (15) and approach each other, a butt-joint wheel (20) is fixedly connected to the centrifugal shaft (16) to be in butt joint with the centrifugal wheel (15), telescopic trapezoidal blocks (21) are uniformly arranged on the outer circumferential surface of the butt-joint wheel (20), the telescopic trapezoidal blocks (21) are matched with the trapezoidal grooves (19), the telescopic trapezoidal blocks (21) can radially contract towards accommodating grooves (22) circumferentially distributed on the butt-joint wheel (20) along the radial direction of the butt-joint wheel (20), and a telescopic spring (23) is arranged between the bottom of the accommodating grooves (22) and the butt-joint wheel (20), the docking wheel (20) is rotatably connected to the adjusting column (6).

5. The variable displacement oil pump of claim 4, characterized in that the centrifugal shaft (16) includes a first centrifugal shaft body (24) and a second centrifugal shaft body (26), one end of the first centrifugal shaft body (24) penetrates through the shell (2) in a sliding manner to be connected with the motor (17), the other end of the first centrifugal shaft body (24) can axially and slidably extend into the second centrifugal shaft body (26) to be fixedly sleeved with a pinion (27), the pinion (27) is matched with a tooth cavity (28) in one end of the second centrifugal shaft body (26), the tooth cavity (28) is longer than the pinion (27) in axial length, the second centrifugal shaft body (26) is connected with the adjusting column (6) through a bearing (29), and the bearing (29) enables the second centrifugal shaft body (26) to rotate relative to the adjusting column (6) but does not move axially relative to the adjusting column.

6. The oil pump of claim 5, characterized in that the centrifugal wheel (15) is provided with a first sealing ring (30) on its outer circumference, and the housing (2) is provided with a second sealing ring (31) on its portion abutting against the centrifugal wheel (15).

7. A variable displacement oil pump according to claim 6, characterised in that the oil discharge chamber (9) communicates with a first oil pressure chamber (32), the first oil pressure chamber (32) being formed by a space between an oil pressure groove (36) in the housing (2) and a radial ring (34) on the adjustment post (6), the oil pressure groove (36) slidably connecting the radial ring (34).

8. A variable displacement oil pump according to claim 7, characterised in that the oil suction chamber (8) communicates with a second oil pressure chamber (33), the second oil pressure chamber (33) being formed by the space between an oil pressure groove (36) of the housing (2) and a radial ring (34) on the adjustment column (6).

9. A variable displacement oil pump according to claim 8, characterised in that an oil pressure sensor (35) is provided in both the first oil pressure chamber (32) and the second oil pressure chamber (33), the oil pressure sensor (35) being electrically connected to the electric motor (17).

10. A variable displacement oil pump according to claim 9, characterised in that the radial ring (34) is provided with two oil pressure bumps (3) extending into the first oil pressure chamber (32) and the second oil pressure chamber (33), respectively, the oil pressure sensor (35) being provided on the oil pressure bumps (3).

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