CN212272338U

CN212272338U - Variable displacement oil pump slide block control mechanism

Info

Publication number: CN212272338U
Application number: CN202021275401.5U
Authority: CN
Inventors: 刘伟丰; 许仲秋; 刘光明; 佘笑梅
Original assignee: Hunan Oil Pump Co Ltd
Current assignee: Hunan Oil Pump Co Ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-01-01
Anticipated expiration: 2030-07-03

Abstract

A sliding block control mechanism of a variable displacement oil pump relates to the technical field of variable displacement oil pumps and comprises a sliding block arranged in a rotor cavity and a pilot valve connected to one side of the rotor cavity, wherein a sliding block arm is fixedly connected to one side of the sliding block, the pilot valve comprises a valve hole and a movable valve core arranged in the valve hole, the valve hole comprises a front valve hole part, a middle valve hole part and a rear valve hole part, the valve core is positioned between the front valve hole part and the middle valve hole part and separates the front valve hole part from the middle valve hole part, a first oil inlet hole is formed in the middle valve hole part, a compression spring is arranged in the front valve hole part, the front end and the rear end of the compression spring are respectively abutted against the front end of the valve hole and the valve core, the valve core is fixedly connected with a connecting rod, and the front end of the connecting rod penetrates through the front. The utility model discloses utilize the connecting rod to promote the slider swing to accelerate control reaction time, reduce the design degree of difficulty and simplify seal structure.

Description

Variable displacement oil pump slide block control mechanism

Technical Field

The utility model relates to a variable displacement oil pump technical field especially indicates a variable displacement oil pump slider control mechanism.

Background

With the increasing development of the energy-saving and emission-reducing technology of automobiles, the variable-displacement oil pump is widely applied to the lubricating system of the internal combustion engine. The existing variable displacement oil pump is generally provided with a movable slide block in an oil cavity, and feedback oil enters the feedback oil cavity to push the slide block to swing so as to change the displacement of the pump. The slider control method has the disadvantages that long reaction time is needed from the time when feedback oil enters the feedback oil cavity to the time when the slider is pushed to swing, a complicated sealing structure is needed to be designed in order to prevent the oil in the feedback oil cavity from entering the rotor cavity, and moreover, because a spring is needed to be arranged on one side of the slider to abut against the slider, the specification of the corresponding elastic coefficient required by the slider is troublesome to calculate.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a variable discharge capacity oil pump slider control mechanism utilizes the connecting rod to promote the slider swing to accelerate control reaction time, reduce the design degree of difficulty and simplify seal structure.

In order to solve the technical problem, the utility model discloses a following technical scheme: a displacement-variable oil pump slide block control mechanism comprises a slide block arranged in a rotor cavity and a pilot valve connected to one side of the rotor cavity, wherein one side of the slide block is fixedly connected with a slide block arm, the pilot valve comprises a valve hole and a movable valve core arranged in the valve hole, the valve hole comprises a front valve hole part, a middle valve hole part and a rear valve hole part, the valve core is positioned between the front valve hole part and the middle valve hole part and separates the front valve hole part from the middle valve hole part, the middle valve hole part is provided with a first oil inlet, a compression spring is arranged in the front valve hole part, the front end and the rear end of the compression spring are respectively abutted against the front end of the valve hole and the valve core, the valve core is fixedly connected with a connecting rod, the front end of the connecting rod penetrates through the front end of the valve hole and is movably connected with a slide block arm, and the compression spring can push the valve core so, the engine oil entering from the first oil inlet can push the valve core, so that the connecting rod pushes the slider arm and drives the slider to swing to change the displacement.

Furthermore, the rear valve hole part is provided with a plug and a bushing installed at the front end of the plug, the front end of the bushing is provided with a jack, and the rear end of the connecting rod penetrates through the valve core and is inserted into the jack.

The rear part of the bush is provided with a second oil inlet which is controlled to be opened and closed by an electromagnetic valve, the second oil inlet is communicated with the jack, and engine oil entering from the second oil inlet can enter the jack and push the connecting rod from the rear end of the connecting rod.

Furthermore, a sliding groove is formed in the sliding block arm, a transmission pin capable of sliding along the sliding groove is arranged in the sliding groove, and one end of the transmission pin extends out of the sliding groove and is movably connected with the connecting rod.

Furthermore, the front end of the connecting rod is provided with a mounting hole for sleeving the transmission pin, the outer wall surface of the transmission pin is provided with a limiting bulge for preventing the transmission pin from being separated from the connecting rod, and the limiting bulge is positioned between the chute notch and the connecting rod.

Preferably, the limiting protrusion is of a snap ring-shaped structure annularly arranged on the outer wall of the connecting rod.

More preferably, the front end of the connecting rod is provided with a connecting part with a rectangular longitudinal section, the thickness of the connecting part is smaller than the diameter of the connecting rod, and the mounting hole is formed in the connecting part.

The utility model discloses a theory of operation is: when the engine oil gradually enters from the first oil inlet hole of the pilot valve, the valve core can be pushed to move towards the front end of the valve hole, and then the connecting rod can push the sliding block arm forwards, so that the sliding block swings, and the displacement of the engine oil pump is changed.

Compare traditional structure and utilize feedback oil to get into the feedback oil pocket and promote the slider swing, through the utility model discloses a control mechanism drives the slider swing and can accelerate control reaction time to because one side of slider arm need not to set up spring, opposite side again and also need not to set up the feedback oil pocket again, this makes the design degree of difficulty of variable displacement oil pump obviously reduce, and seal structure also can be effectively simplified.

Drawings

Fig. 1 is a schematic cross-sectional view of the overall structure in an embodiment of the present invention;

FIG. 2 is a partial structural view of an embodiment;

fig. 3 is a schematic cross-sectional view of the structure at a-a in fig. 1.

The reference signs are:

1-slide block 1 a-slide block arm 2-pilot valve

2a front valve hole part 2b, middle valve hole part 2c and rear valve hole part

3-valve core 4-compression spring 5-connecting rod

5 a-connecting part 6-sliding groove 7-driving pin

7 a-limit bulge 8 a-first oil inlet hole 8 b-second oil inlet hole

9-plug 10-bush 11-jack.

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.

It should be noted that, in the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, in the present disclosure, unless explicitly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. The terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element 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.

As shown in fig. 1-3, a variable displacement oil pump slide block control mechanism comprises a slide block 1 arranged in a rotor cavity and a pilot valve 2 connected to one side of the rotor cavity, one side of the slide block 1 is fixedly connected with a slide block arm 1a, the pilot valve 2 comprises a valve hole and a movable valve core 3 arranged in the valve hole, the valve hole comprises a front valve hole part 2a, a middle valve hole part 2b and a rear valve hole part 2c, the valve core 3 is positioned between the front valve hole part 2a and the middle valve hole part 2b and separates the front valve hole part 2a from the middle valve hole part 2b, the middle valve hole part 2a is provided with a first oil inlet 8a, a compression spring 4 is arranged in the front valve hole part 2a, the front end and the rear end of the compression spring 4 are respectively abutted against the front end of the valve hole and the valve core 3, the valve core 3 is fixedly connected with a connecting rod 5, the front end of the connecting rod 5 passes through the, the compression spring 4 can push the valve core 3 to enable the connecting rod 5 to drive the sliding block arm 1a to push against the inner wall of the rotor cavity, the engine oil entering from the first oil inlet hole 8a can push the valve core 3, and then the connecting rod 5 pushes the sliding block arm 1a and drives the sliding block 1 to swing to achieve displacement change.

After the variable-displacement oil pump slide block control mechanism provided by the embodiment is applied to the variable-displacement oil pump, the traditional mode that feedback oil enters the feedback oil cavity to drive the slide block to swing can be replaced, and a better effect can be obtained. Specifically, when the displacement of the variable displacement oil pump is not required to be changed in normal operation, because excessive engine oil cannot enter the middle valve hole part 2b, the valve core 3 can move towards the rear end of the valve hole under the action of the elastic force of the compression spring 4, and the connecting rod 5 drives the slider arm 1a to abut against the inner wall surface of the oil cavity of the pump body, when the displacement is required to be changed, the system oil pressure changes, more engine oil can enter the first oil inlet hole 8a from the external feedback oil channel and gush into the middle valve hole part 2b so as to push the valve core 3 to move towards the front end of the valve hole, so that the compression spring 4 is further compressed, meanwhile, the connecting rod 5 pushes the slider arm 1a forwards, the slider 1 swings, and the displacement of the oil pump is changed. Compare traditional structure and utilize feedback oil to get into the feedback oil pocket and promote the slider swing, through the utility model discloses a control mechanism drives the swing of slider 1 and can accelerate control reaction time to because one side of slider arm 1a need not to set up spring, opposite side again and also need not to set up the feedback oil pocket again, this makes the design degree of difficulty of variable displacement oil pump obviously reduce, and seal structure also can be effectively simplified.

It should be noted that, in the above-mentioned embodiment, the front end of the valve hole is provided with a through hole for the front end of the connecting rod 5 to pass through, the through hole and the connecting rod 5 can be in clearance fit, and a sealing structure is not required to be provided, so that the front side of the slider arm 1a (the oil inlet chamber of the oil pump), the rear side of the slider arm 1a, the gap between the through hole and the connecting rod 5, and the front valve hole portion 2a are communicated with each other, which can provide a lubricating effect for the movement of the connecting rod 5 in the through hole on one hand, and on the other hand, those skilled in the art should know that the amount of oil leaking from the gap between the through hole and the connecting rod 5 to the front valve hole portion 2a is not large in practice, and the amount of oil will return to the pump body oil chamber again after the spool 3 moves forward.

Further, the rear valve hole 2c in the above embodiment is provided with the plug 9 and the bushing 10 installed at the front end of the plug 9, the front end of the bushing 10 is provided with the insertion hole 11, the rear end of the connecting rod 5 penetrates through the valve core 3 and is inserted into the insertion hole 11, and the presence of the insertion hole 11 can further improve the positioning and guiding functions of the connecting rod 5, so that the operation of the control mechanism is more stable and smooth.

On the basis of the above, a second oil inlet 8b controlled to be opened and closed by an electromagnetic valve may be further provided at the rear portion of the liner 10, the second oil inlet 8b communicates with the insertion hole 11, so that the oil entering from the second oil inlet 8b may enter the insertion hole 11 and push the connecting rod 5 from the rear end of the connecting rod 5, and the control mechanism may be applied to a two-stage variable displacement oil pump by providing the second oil inlet 8b controlled to be opened and closed by the electromagnetic valve. The specific working principle is that the first oil inlet 8a and the external feedback oil duct are normally open, the second oil inlet 8b can be opened and closed under the control of an electromagnetic valve, when low-pressure-level variable is required, the second oil inlet 8b is opened, at the moment, both the first oil inlet 8a and the second oil inlet 8b can be filled with oil, so that the acting area of the oil is the largest (the total area of the annular rear end surface of the valve core 3 and the rear end surface of the connecting rod 5), when the pressure reaches a set value, namely the force borne by the whole formed by the valve core 3 and the connecting rod 5 is larger than the pressure of the compression spring 4, the valve core 3 and the connecting rod 5 move towards the front end of the valve hole, and then the connecting rod 5 pushes the slider arm 1a to realize the swing of the slider 1, so as to achieve the purpose; when high pressure level variable is required, the second oil inlet 8b is closed, only the first oil inlet 8a can feed oil at the moment, so that the acting area of oil is only the area size of the annular rear end surface of the valve core 3 (the acting area of oil pressure becomes smaller relative to the acting area of oil pressure during low pressure level variable), and when the pressure reaches the highest pressure value, the oil can push the valve core 3 to move towards the front end of the valve hole, so that the connecting rod 5 pushes the sliding block arm 1a to swing to realize the sliding block 1, and the purpose of changing the displacement of the oil pump is achieved.

It should be understood by those skilled in the art that the method for controlling the opening and closing of the second oil inlet 8b by the solenoid valve is a conventional technical means in the prior art, and thus the structure of the solenoid valve is not specifically described and defined.

Further, the sliding groove 6 has been seted up on the slider arm 1a, be equipped with in the sliding groove 6 and follow the gliding drive pin 7 of sliding groove 6, the one end of drive pin 7 from the sliding groove 6 in toward stretching out and with connecting rod 5 swing joint, because the motion of connecting rod 5 is the reciprocating motion of rectilinear direction, and the activity of slider 1 is then the wobbling mode, consequently through setting up sliding groove 6, can make the reciprocating motion of connecting rod 5 easily promote drive pin 7 and remove along sliding groove 6, and then drive the swing of slider 1.

On the basis, the height of the sliding block arm 1a can be designed to be smaller than that of the sliding block 1 (the height of the sliding block 1 is defined in the axis direction of the sliding block 1), so that the sliding groove 6 can be directly arranged on the upper end face of the sliding block arm 1a, and the connecting rod 5 can conveniently straighten the upper part of the sliding block arm 1a for assembly connection.

Preferably, the connecting rod 5 and the driving pin 7 may have a specific connecting structure, wherein a mounting hole for housing the driving pin 7 is formed at the front end of the connecting rod 5, and a limiting protrusion 7a for preventing the driving pin 7 from being separated from the connecting rod 5 is formed on the outer wall surface of the driving pin 7, the limiting protrusion 7a is located between the notch of the sliding groove 6 and the connecting rod 5, and the limiting protrusion 7a is a snap ring-shaped structure annularly arranged on the outer wall of the connecting rod 5.

More preferably, as shown in fig. 3, the front end of the link 5 is provided with a connecting portion 5a having a rectangular longitudinal section, the thickness of the connecting portion 5a is smaller than the diameter of the link 5, and the mounting hole is formed in the connecting portion 5a, so that the connecting portion 5a can be designed to make the structure of the connecting portion between the link 5 and the slider arm 1a more compact.

In addition, in order to assemble the control mechanism conveniently, the connecting rod 5 can be designed into a front rod part and a rear rod part which are detachably connected, the front rod part is connected with the driving pin 7 and then penetrates into the valve hole backwards, the valve core 3 can be fixed on the rear rod part, and then the rear rod part is installed from the rear end of the valve hole and is in threaded connection with the front rod part.

The above-mentioned embodiment is the utility model discloses the implementation scheme of preferred, in addition, the utility model discloses can also realize by other modes, any obvious replacement is all within the protection scope of the utility model under the prerequisite that does not deviate from this technical scheme design.

In order to make it easier for those skilled in the art to understand the improvement of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and in order to clarify, some other elements have been omitted from this document, those skilled in the art should recognize that these omitted elements may also constitute the content of the present invention.

Claims

1. A variable displacement oil pump slide block control mechanism comprises a slide block (1) arranged in a rotor cavity and a pilot valve (2) connected to one side of the rotor cavity, and is characterized in that: one side of the sliding block (1) is fixedly connected with a sliding block arm (1 a), the pilot valve (2) comprises a valve hole and a movable valve core (3) arranged in the valve hole, the valve hole comprises a front valve hole part (2 a), a middle valve hole part (2 b) and a rear valve hole part (2 c), the valve core (3) is positioned between the front valve hole part (2 a) and the middle valve hole part (2 b) and separates the front valve hole part (2 a) and the middle valve hole part (2 b), the middle valve hole part (2 b) is provided with a first oil inlet (8 a), a compression spring (4) is arranged in the front valve hole part (2 a), the front end and the rear end of the compression spring (4) are respectively abutted against the front end of the valve hole and the valve core (3), the valve core (3) is fixedly connected with a connecting rod (5), and the front end of the connecting rod (5) penetrates through the front end of the valve hole and is movably connected with the sliding block arm, the compression spring (4) can push the valve core (3) to enable the connecting rod (5) to drive the sliding block arm (1 a) to push against the inner wall of the rotor cavity, engine oil entering from the first oil inlet hole (8 a) can push the valve core (3), and then the connecting rod (5) pushes the sliding block arm (1 a) and drives the sliding block (1) to swing to achieve displacement change.

2. The variable displacement oil pump slider control mechanism of claim 1, wherein: the rear valve hole part (2 c) is provided with a plug (9) and a bushing (10) installed at the front end of the plug (9), the front end of the bushing (10) is provided with an insertion hole (11), and the rear end of the connecting rod (5) penetrates through the valve core (3) and is inserted into the insertion hole (11).

3. The variable displacement oil pump slider control mechanism of claim 2, wherein: and a second oil inlet hole (8 b) controlled to be opened and closed by an electromagnetic valve is formed in the rear part of the bush (10), the second oil inlet hole (8 b) is communicated with the jack (11), and engine oil entering from the second oil inlet hole (8 b) can enter the jack (11) and push the connecting rod (5) from the rear end of the connecting rod (5).

4. The variable displacement oil pump slider control mechanism of claim 1, wherein: the slider arm (1 a) is provided with a sliding groove (6), the sliding groove (6) is internally provided with a transmission pin (7) capable of sliding along the sliding groove (6), and one end of the transmission pin (7) extends out of the sliding groove (6) and is movably connected with the connecting rod (5).

5. The variable displacement oil pump slider control mechanism of claim 4, wherein: the mounting hole that is used for entangling drive pin (7) is seted up to the front end of connecting rod (5), be equipped with on the outer wall of drive pin (7) and be used for preventing its spacing arch (7 a) that break away from with connecting rod (5), spacing arch (7 a) are located between spout (6) notch and connecting rod (5).

6. The variable displacement oil pump slider control mechanism of claim 5, wherein: the limiting bulge (7 a) is of a clamping ring structure which is annularly arranged on the outer wall of the connecting rod (5).

7. The variable displacement oil pump slider control mechanism of claim 6, wherein: the front end of the connecting rod (5) is provided with a section of connecting part (5 a) with a rectangular longitudinal section, the thickness of the connecting part (5 a) is smaller than the diameter of the connecting rod (5), and the mounting hole is formed in the connecting part (5 a).