CN115095519A - Swing type variable displacement oil pump - Google Patents

Swing type variable displacement oil pump Download PDF

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Publication number
CN115095519A
CN115095519A CN202210789798.7A CN202210789798A CN115095519A CN 115095519 A CN115095519 A CN 115095519A CN 202210789798 A CN202210789798 A CN 202210789798A CN 115095519 A CN115095519 A CN 115095519A
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CN
China
Prior art keywords
variable
cavity
oil pump
spring
rotating pin
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Granted
Application number
CN202210789798.7A
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Chinese (zh)
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CN115095519B (en
Inventor
胥美姣
曾欢翔
许仲秋
刘光明
佘笑梅
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Hunan Meihu Intelligent Manufacturing Co.,Ltd.
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Hunan Oil Pump Co Ltd
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Priority to CN202210789798.7A priority Critical patent/CN115095519B/en
Publication of CN115095519A publication Critical patent/CN115095519A/en
Application granted granted Critical
Publication of CN115095519B publication Critical patent/CN115095519B/en
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Classifications

    • 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
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/356—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
    • F04C2/3562—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0238—Rotary pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0246—Adjustable pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

The invention provides a swing type variable displacement oil pump which comprises a pump body, wherein the pump body is provided with a cavity for accommodating a variable slider, a variable spring and a rotating pin; a pressure feedback cavity is formed between the inner side wall of the cavity of the pump body and the outer wall of one side of the variable sliding block; the right end surface of the variable spring is in contact fit with the variable sliding block, and the left end surface of the variable spring is in contact fit with the inner side wall of the cavity of the pump body; the variable slider can swing left and right in the cavity of the pump body around the rotating pin under the action of oil pressure in the variable spring or the pressure feedback cavity; a rotor cavity for accommodating an oil pump rotor assembly is arranged in the middle of the variable sliding block; the distance from the center of the right end face of the variable spring to the axis of the rotating pin is close to the distance from the center of the rotor cavity to the axis of the rotating pin. By adopting the technical scheme, under the condition of the same eccentric change of the variable sliding block, the amount of compression required by the variable spring is greatly reduced, so that the pumping pressure of the variable oil pump is not greatly increased on the premise of not changing the PWM value.

Description

Swing type variable displacement oil pump
Technical Field
The invention relates to a lubricating system of an internal combustion engine, in particular to a swing type variable displacement oil pump.
Background
The oscillating variable displacement oil pump generally comprises a pump body, a variable sliding block, a variable spring and a pressure feedback cavity, pressure oil from a main oil duct or an outlet of the pump enters the pressure feedback cavity through an oil path to guide the oil, an electro-hydraulic proportional valve is arranged to control the on-off of the oil path and the opening of a valve port, the pressure oil enters the pressure feedback cavity through the electro-hydraulic proportional valve and acts on the variable sliding block, when the pressure of the pressure oil reaches a set pressure value, the variable sliding block can be pushed to overcome the pretightening force of the variable spring to perform eccentric movement, and therefore the displacement output of the oil pump is reduced.
Fig. 1 is a rotation speed characteristic diagram of a variable displacement oil pump using an electro-hydraulic proportional valve, in which 10 pressure curves with different PWM ratios are plotted, and when the oil pump reaches a variable, the pressure curve of the PWM, especially the pressure curve close to 100% PWM, is gradually increased as the rotation speed of the oil pump is increased, at this time, an ECU is required to adjust the PWM, and the adjustment requires time to react, and a situation that the pressure does not meet the current requirement microscopically occurs.
The reason for this pressure curve to trend upward is:
1) when the duty ratio of the electro-hydraulic proportional valve is 100% PWM or approaches to 100% PWM, the port P and the port A of the proportional valve are completely communicated, the output pressure is not controlled, and the curve is completely determined by a variable spring;
2) considering the suppression of pressure fluctuation, the stiffness range of the variable spring is 6-10N/mm, the spring is more difficult to compress the spring to the rear, and larger pressure is needed, so that the rising trend is generated.
The ideal speed characteristic diagram is shown in fig. 2, and the pressure curves of different PWM ratios are all straight, which indicates that the pressure output is relatively smooth.
Disclosure of Invention
The invention aims to solve the technical problem of providing a swing type variable displacement oil pump with stable pressure output.
In order to solve the technical problem, the technical scheme of the invention about the proportional valve is as follows: a swing type variable displacement oil pump comprises a pump body, wherein a cavity is formed in the pump body and used for containing a variable sliding block, a variable spring and a rotating pin; a pressure feedback cavity is formed between the inner side wall of the cavity of the pump body and the outer wall of one side of the variable sliding block; the right end surface of the variable spring is in contact fit with the variable sliding block, and the left end surface of the variable spring is in contact fit with the inner side wall of the cavity of the pump body; the variable slider can swing left and right in the cavity of the pump body around the rotating pin under the action of oil pressure in the variable spring or the pressure feedback cavity; a rotor cavity for accommodating an oil pump rotor assembly is arranged in the middle of the variable slide block; the distance from the center of the right end face of the variable spring to the axis of the rotating pin is close to the distance from the center of the rotor cavity to the axis of the rotating pin.
As a preferred technical scheme, the distance from the center of the right end face of the variable spring to the axis of the rotating pin is less than or equal to the distance from the center of the rotor cavity to the axis of the rotating pin.
In one embodiment, the center of the right end face of the variable spring and the center of the rotor cavity are both positioned on the same circumferential line with the axis of the rotating pin as the center.
Further, the side of the variable slider participating in forming the pressure feedback cavity is provided with a convex part extending away from the rotating pin.
Preferably, the oil pump is a vane pump.
In one embodiment, the outer side of the convex part of the variable sliding block is provided with a groove which penetrates through the upper end surface and the lower end surface of the variable sliding block, a rubber rod and a sealing strip are installed in the groove, and the sealing strip is used for sealing the pressure feedback cavity.
According to the invention, by changing the mounting position of the variable spring, even if the distance from the center of the right end face of the variable spring to the axis of the rotating pin is close to the distance from the center of the rotor cavity to the axis of the rotating pin, the required compression amount of the variable spring is greatly reduced under the condition that the variable slide block is subjected to the same eccentric change, so that the pumping pressure after the oil pump is changed can not be greatly increased under the condition that the PWM value is not changed, and the PWM regulating quantity of the ECU can be reduced.
Drawings
FIG. 1 is a diagram of the rotation speed characteristics of an oil pump using an electro-hydraulic proportional valve;
FIG. 2 is a diagram illustrating the rotation speed characteristics of an ideal engine oil pump;
FIG. 3 is a schematic diagram of a conventional oil pump;
FIG. 4 is a schematic diagram of an oil pump structure according to an embodiment of the present invention;
FIG. 5 is a graph comparing pressure curves in examples of the present invention;
the reference signs are:
1-pump body 2-variable slide block 3-variable spring
4-rotating pin 5-pressure feedback chamber.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those 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, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or interconnected between two elements, directly or indirectly through intervening media, and the specific meaning of the terms may be understood by those skilled in the art according to their specific situation.
As shown in fig. 3, the conventional swing type variable displacement oil pump includes a pump body 1, a variable slider 2, a variable spring 3, a rotary pin 4, and a pressure feedback cavity 5, wherein the variable slider 2 can swing around the rotary pin 4, the variable spring 3 is disposed at a position far away from the rotary pin 4, the right end surface of the variable spring 3 is in contact fit with the variable slider 4, and the left end surface is in contact fit with the inner side wall of a cavity of the pump body. When the pressure oil in the pressure feedback cavity 5 reaches a set pressure value, the variable slider 4 can be pushed to deflect towards the variable spring 3, the variable spring 3 is compressed, the variable spring 3 is arranged at a position far away from the rotating pin 4, the variable spring 3 needs to be compressed by a large amount, the spring is difficult to compress at the back, and a larger oil pressure is needed, so that the output pressure of the oil pump is forced to generate an ascending trend. In fig. 3, a circumferential line a is a swing locus of the variable slider, a circumferential line B is a swing locus of the variable spring, and a radius of the circumferential line B is much larger than that of the circumferential line a.
As shown in fig. 4, the preferred embodiment of the present invention is: a swing type variable displacement oil pump is a vane pump and comprises a pump body 1, wherein a cavity is formed in the pump body 1 and used for accommodating a variable sliding block 2, a variable spring 3 and a rotating pin 4; a pressure feedback cavity 5 is formed between the inner side wall of the cavity of the pump body 1 and the outer wall of one side of the variable slide block 2; the right end surface of the variable spring 3 is in contact fit with the variable sliding block 2, and the left end surface of the variable spring is in contact fit with the inner side wall of the cavity of the pump body 1; the variable slider 2 can swing left and right in the cavity of the pump body 1 around the rotating pin 4 under the action of oil pressure in the variable spring 3 or the pressure feedback cavity 5; the middle part of the variable slide block 2 is provided with a rotor cavity for accommodating an oil pump rotor assembly; the distance from the center of the right end face of the variable spring 3 to the axis of the rotating pin 4 is less than or equal to the distance from the center of the rotor cavity to the axis of the rotating pin 4; the optimal scheme is as follows: the center of the right end face of the variable spring 3 and the center of the rotor cavity are both positioned on the same circumferential line A which takes the axle center of the rotating pin 4 as the center of a circle.
As shown in fig. 4, the side of the variable slider 2 participating in forming the pressure feedback cavity 5 is provided with a convex part extending in a direction away from the rotating pin 4, the outer side of the convex part of the variable slider 2 is provided with a groove penetrating through the upper end surface and the lower end surface of the variable slider 2, and a rubber rod and a sealing strip are installed in the groove and used for sealing the pressure feedback cavity 5.
In the embodiment, by changing the installation position of the variable spring 3, even if the distance from the center of the right end face of the variable spring 3 to the axis of the rotating pin 4 is close to the distance from the center of the rotor cavity to the axis of the rotating pin 4, the amount of compression required by the variable spring 3 can be greatly reduced under the condition that the variable slide block 2 has the same eccentricity change, so that the pumping pressure of the variable oil pump can not be greatly increased under the premise that the PWM value is not changed, and the PWM regulating quantity of the ECU can be reduced. Fig. 5 shows two comparisons between a pressure curve a of the conventional oil pump and a pressure curve B of the oil pump of the present embodiment, where the rising gradient of the pressure curve B is gentler than that of the pressure curve a, which means that the pressure change is smaller, and the adjustment range is narrowed.
The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.
Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.

Claims (6)

1. The oscillating variable displacement oil pump comprises a pump body (1), wherein the pump body (1) is provided with a cavity for accommodating a variable slider (2), a variable spring (3) and a rotary pin (4), a pressure feedback cavity (5) is formed between the inner side wall of the cavity of the pump body (1) and the outer wall of one side of the variable slider (2), the right end surface of the variable spring (3) is in contact fit with the variable slider (2), the left end surface of the variable spring is in contact fit with the inner side wall of the cavity of the pump body (1), the variable slider (2) can perform left-right deflection in the cavity of the pump body (1) around the rotary pin (4) under the action of oil pressure in the variable spring (3) or the pressure feedback cavity (5), and the middle of the variable slider (2) is provided with a rotor cavity for accommodating an oil pump rotor assembly, and the oscillating variable displacement oil pump is characterized in that: the distance from the center of the right end face of the variable spring (3) to the axis of the rotating pin (4) is close to the distance from the center of the rotor cavity to the axis of the rotating pin (4).
2. The oscillating variable displacement oil pump of claim 1, wherein: the distance from the center of the right end face of the variable spring (3) to the axis of the rotating pin (4) is less than or equal to the distance from the center of the rotor cavity to the axis of the rotating pin (4).
3. The oscillating variable displacement oil pump of claim 1 or 2, wherein: the center of the right end face of the variable spring (3) and the center of the rotor cavity are both positioned on the same circumferential line with the axis of the rotating pin (4) as the center of a circle.
4. The oscillating variable displacement oil pump of claim 1 or 2, wherein: the side of the variable slider (2) participating in forming the pressure feedback cavity (5) is provided with a convex part extending in the direction away from the rotating pin (4).
5. The oscillating variable displacement oil pump of claim 1 or 2, wherein: the oil pump is a vane pump.
6. The oscillating variable displacement oil pump of claim 4, wherein: the outer side of the convex part of the variable sliding block (2) is provided with a groove which penetrates through the upper end surface and the lower end surface of the variable sliding block (2), a rubber rod and a sealing strip are installed in the groove, and the sealing strip is used for sealing the pressure feedback cavity (5).
CN202210789798.7A 2022-07-06 2022-07-06 Oscillating variable displacement oil pump Active CN115095519B (en)

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CN202210789798.7A CN115095519B (en) 2022-07-06 2022-07-06 Oscillating variable displacement oil pump

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CN202210789798.7A CN115095519B (en) 2022-07-06 2022-07-06 Oscillating variable displacement oil pump

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CN115095519A true CN115095519A (en) 2022-09-23
CN115095519B CN115095519B (en) 2024-04-16

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10205461A (en) * 1997-01-20 1998-08-04 Nachi Fujikoshi Corp Variable discharge amount vane pump
CN101268279A (en) * 2005-07-29 2008-09-17 Miba烧结控股有限及两合公司 Vane-cell pump
CN102095068A (en) * 2010-11-13 2011-06-15 湖南机油泵股份有限公司 Variable rotor oil pump regulated and controlled by wave wheel
CN103335202A (en) * 2013-07-28 2013-10-02 湖南机油泵股份有限公司 Main pump of mechanical valve-controlled double-cavity variable-displacement vane type oil pump
US20130309113A1 (en) * 2012-05-18 2013-11-21 Magna Powertrain Inc. Multiple Stage Passive Variable Displacement Vane Pump
CN203656545U (en) * 2013-10-16 2014-06-18 宁波圣龙汽车动力***股份有限公司 Oil pump displacement regulation device
CN213870261U (en) * 2020-12-16 2021-08-03 湖南机油泵股份有限公司 Variable displacement vane pump capable of suppressing interference

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10205461A (en) * 1997-01-20 1998-08-04 Nachi Fujikoshi Corp Variable discharge amount vane pump
CN101268279A (en) * 2005-07-29 2008-09-17 Miba烧结控股有限及两合公司 Vane-cell pump
CN102095068A (en) * 2010-11-13 2011-06-15 湖南机油泵股份有限公司 Variable rotor oil pump regulated and controlled by wave wheel
US20130309113A1 (en) * 2012-05-18 2013-11-21 Magna Powertrain Inc. Multiple Stage Passive Variable Displacement Vane Pump
CN103335202A (en) * 2013-07-28 2013-10-02 湖南机油泵股份有限公司 Main pump of mechanical valve-controlled double-cavity variable-displacement vane type oil pump
CN203656545U (en) * 2013-10-16 2014-06-18 宁波圣龙汽车动力***股份有限公司 Oil pump displacement regulation device
CN213870261U (en) * 2020-12-16 2021-08-03 湖南机油泵股份有限公司 Variable displacement vane pump capable of suppressing interference

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Address after: No.69 Hengyue North Road, Chengguan Town, Hengdong County, Hengyang City, Hunan Province

Patentee after: Hunan Meihu Intelligent Manufacturing Co.,Ltd.

Country or region after: China

Address before: No.69 Hengyue North Road, Chengguan Town, Hengdong County, Hengyang City, Hunan Province

Patentee before: Hunan Oil Pump Co.,Ltd.

Country or region before: China