CN207049384U

CN207049384U - Pressure limiting valve

Info

Publication number: CN207049384U
Application number: CN201721029438.8U
Authority: CN
Inventors: 许仲秋; 刘小江
Original assignee: Hunan Oil Pump Co Ltd
Current assignee: Hunan Oil Pump Co Ltd
Priority date: 2017-08-17
Filing date: 2017-08-17
Publication date: 2018-02-27
Anticipated expiration: 2027-08-17

Abstract

The utility model provides a kind of pressure limiting valve, it is related to engine lubrication system field, it includes offering the valve body of valve pocket, plunger and spring in valve pocket, the spring one end connection plunger, the other end are fixed on valve pocket bottom, oil inlet and oil-out are offered on the valve body, the plunger is provided with big round platform towards the end face of oil inlet, and the big round platform is provided with small round platform.The utility model can slow down impulsive force of the fluid to plunger, reduce the pressure oscillation of fluid around plunger, reduce operating noise, its stable performance, service life length.

Description

Pressure limiting valve

Technical field

Engine lubrication system is the utility model is related to, especially a kind of pressure limiting valve of engine oil pump.

Background technology

One of pressure limiting valve, the parts as engine oil pump lubricating system, it can maintain the steady of oil pressure in main oil gallery Fixed, when high engine speeds operate, the oil pressure of main oil gallery is higher than needed for engine during the oil pressure of fluid, and pressure limiting valve will be opened, A part of fluid of main oil gallery is let out toward oil sump, so as to reduce the oil pressure of access to engine oil duct, remains normal in main oil gallery Oil pressure, conversely, when the engine operates with a low speed, pressure limiting valve can be closed.

Pressure limiting valve is typically mounted on the pump housing of lubricating oil pump, and in the prior art, pressure limiting valve is mainly plunger type pressure limiting valve, As shown in figure 1, pressure limiting valve includes valve body 1, plunger 2 and spring 3, plunger 2 by the hydraulic coupling of main oil gallery and the elastic force of spring 3, by Both power determine the motion of plunger 2, so as to carry out pressure release to main oil gallery.However, the pressure limiting valve of this type, its end of plunger 2 Face is the horizontal plane of a finishing（Main oil gallery can be exported and blocked）, pressure limiting valve is during unlatching and closing, from main oil gallery Fluid only produce powerful impulsive force between the end face of plunger 2, and the end face of plunger 2 does not have any buffer structure, therefore should The pressure oscillation of the end face fluid of pressure limiting valve plunger 2 can be larger, and this can not only bring noise, and easily pressure limiting valve is produced rolling It is dynamic, the performance of pressure limiting valve is influenceed, will also influence the service life of pressure limiting valve for a long time.

Utility model content

Technical problem to be solved in the utility model, which is to provide a kind of pressure limiting valve, can slow down impulsive force of the fluid to plunger, Reduce the pressure oscillation of fluid around plunger, reduce operating noise, its stable performance, service life length.

To achieve these goals, the utility model adopts the following technical scheme that：Pressure limiting valve, including offer the valve of valve pocket Body, plunger and spring in valve pocket, the spring one end connection plunger, the other end are fixed on valve pocket bottom, the valve body On offer oil inlet and oil-out, the plunger is provided with big round platform towards the end face of oil inlet, and the big round platform is provided with Small round platform.

Further, the diameter difference of the plunger end face and big round platform is 0.5mm and the diameter difference of small round platform is 12mm, The discrepancy in elevation of the plunger and big round platform is 47mm and the discrepancy in elevation of small round platform is 50mm.

Further, the plunger is the tubular structure of one end open, and the valve pocket bottom is further fixed on closure, institute State spring one end be located in plunger, other end connection closure.

Further, in addition to regulating bolt and cover plate, the cover plate are arranged on body base, and the regulating bolt is passed through Cover plate and both threaded connections are worn, and the end of the regulating bolt contacts with closure, head end is located at outside cover plate, the sealing The position covered in valve pocket is adjustable.

Preferably, sealing gasket is provided between the cover plate and valve body, and is provided between the closure and valve pocket side wall O-shaped Circle, the sealing gasket and O-ring can prevent the fluid in valve body from leaking.

The beneficial effects of the utility model are：A kind of this pressure limiting valve, its plunger end face are provided with big round platform and small round platform, Such a structure can make pressure limiting valve either during opening or closing, and oil inlet fluid is first to contact small round platform, big Round platform, then be plunger end face, as a whole, the contact surface of fluid and plunger increases successively, effectively reduces fluid and plunger Between instantaneous cushion effect, compared with prior art, fluid is easier smoothly to flow through from plunger surface, thus can greatly reduce Pressure oscillation herein, operating noise is reduced, and pressure limiting valve can be avoided to shake, ensure the normal use of pressure limiting valve, improved Its service life, and the pressure limiting valve, when opening, the also function with secondary draining can further improve engine oil The stability of pressure.

Brief description of the drawings

Fig. 1 is the profile of the pressure limiting valve of prior art；

Fig. 2 is the sectional view of pressure limiting valve in off position in the utility model embodiment；

Fig. 3 is sectional view of the pressure limiting valve in the utility model embodiment in opening；

Fig. 4 is the profile of plunger in the utility model embodiment；

Fig. 5 is the dimensional structure diagram of plunger in the utility model embodiment.

Reference is：

1 --- valve body 101 --- valve pocket 2 --- plunger

201 --- big round platform 202 --- small round platform 3 --- springs

4 --- closure 5 --- regulating bolt 6 --- cover plates

7 --- sealing gasket 8 --- O-rings.

Embodiment

For the ease of the understanding of those skilled in the art, the utility model is made with reference to embodiment and accompanying drawing further Explanation, the content that embodiment refers to not to restriction of the present utility model.

In description of the present utility model, it is to be understood that term " on ", " under ", "front", "rear", "left", "right", The orientation or position relationship of the instruction such as " vertical ", " level ", " top ", " bottom ", " interior ", " outer " be based on orientation shown in the drawings or Position relationship, it is for only for ease of description the utility model and simplifies description, rather than indicates or imply signified device or member Part must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.

, it is necessary to which explanation, unless otherwise prescribed and is limited, term " installation ", " phase in description of the present utility model Even ", " connection " should be interpreted broadly, for example, it may be mechanical connection or the company of electrical connection or two element internals It is logical, can be joined directly together, can also be indirectly connected by intermediary, for the ordinary skill in the art, can To understand the concrete meaning of the term as the case may be.

As shown in Figure 2-5, a kind of pressure limiting valve, including offer the valve body 1 of valve pocket 101 and the plunger in valve pocket 101 2 with spring 3, open up one and main oil gallery at the top of the valve body 1（Either pump discharge）The oil inlet of connection, valve body 1 Side opens up an oil-out（The oil-out can be connected with the oil duct towards oil sump, or the fluid of the oil-out is let out toward hair In the transmission system of motivation）, the one end of spring 3 connection plunger 2, the other end are fixedly mounted on the bottom of valve pocket 101, the plunger 2 are provided with big round platform 201 towards the end face of oil inlet, and big round platform 201 is provided with small round platform 202, the big round platform 201 and roundlet The side of platform 202 is in arc line shaped, and big round platform 201, small round platform 202 and the center overlapping of axles of the three of plunger 2, the plunger 2 It is equal with the diameter of valve pocket 101 in the diameter of the top of valve pocket 101 and the end face of plunger 2.

The pressure limiting valve that above-mentioned embodiment provides, the original state being assemblied in lubricating oil pump（Namely state when closing）Such as Shown in Fig. 2, plunger 2 blocks oil inlet, the fluid of oil inlet can be prevented to be flowed out from oil-out, with carrying for engine speed Height, the oil pressure of oil inlet gradually increase, and when the hydraulic coupling of fluid is more than the elastic force of pressure limiting valve inner spring 3, plunger 2 is transported downwards It is dynamic, also it is not very high due to just starting oil pressure, spring 3 is compressed in small distance, therefore plunger 2 only moves down one section of very little Distance, and now, the fluid of oil inlet forms first time draining from the gap outflow between big round platform 201 and valve pocket 101, Play a part of finely tuning oil pressure, then the hydraulic coupling of main oil gallery further increases, and plunger 2 moves further downward, when reaching most During high hydraulic coupling, as shown in Figure 3（The state that pressure limiting valve is opened）, plunger 2 open completely oil inlet lead to oil-out passage, soon Speed unloading fluid more than needed, makes engine oil pressure be no more than the maximum of setting, plays safeguard protection effect；And the closing of pressure limiting valve Process is：When starting rotating speed to reduce, plunger 2 moves up under the rebound effect of spring 3, now, at first with oil inlet fluid Contact is small round platform 202, next to that big round platform 201 and the end face of plunger 2.As can be seen here, the present embodiment provide pressure limiting valve without By being during unlatching or closing, oil inlet fluid is first to contact small round platform 202, big round platform 201, then is plunger 2 End face, as a whole, the contact surface of fluid and plunger 2 increase successively, effectively reduce instantaneous slow between fluid and plunger 2 Impulse force, compared with prior art, fluid are easier smoothly to flow through from the surface of plunger 2, thus can greatly reduce pressure herein Fluctuation, operating noise is reduced, and pressure limiting valve can be avoided to shake, ensured the normal use of pressure limiting valve, improve its service life, And from the foregoing, the pressure limiting valve that provides of the present embodiment when opening, the also function with secondary draining can be further Improve the stability of engine oil pressure.

Further, as shown in figure 4, a diameter of 30mm of the end face of the plunger 2, a height of 51mm, the big round platform 201 it is straight Footpath is 29.5mm, a height of 4mm, a diameter of 18mm, a height of 1mm of the small round platform 202, from calculating, big round platform 201 and post The diameter difference for filling in 2 end faces is 0.5mm, discrepancy in elevation 47mm, and the end face of plunger 2 and the inwall blind-mate of valve body 1, namely big round platform 201 with a width of 0.25mm, a height of 4mm in the gap of the inwall of valve body 1, learnt by experiment, when big round platform 201 and the inwall of valve body 1 it Between gap size when being 0.25mm*4mm, fine setting effect of the pressure limiting valve to main oil gallery oil pressure is more apparent；And the small diameter of round platform 202 Should be moderate with high size, it is too big or too it is small do not have significantly reduce resistance effect, herein, small round platform 202 it is straight Footpath is 18mm, a height of 1mm is optimal case.

In the manufacturing process of pressure limiting valve, because the profile of spring 3 is irregular and the space of valve pocket 101 is smaller, by spring 3 The technique being directly installed in valve pocket 101 can be more difficult, therefore in order to solve the problems, such as to install inconvenience, further, such as Fig. 2 ~ Fig. 5 Shown, the pressure limiting valve also includes closure 4, first spring 3 is arranged on closure 4, then closure 4 is arranged on into valve pocket 101 Bottom, because closure 4 is regular texture, therefore the technique being fixed in inside valve pocket 101 is simpler, can take welding or The various ways such as interference fit, secondly, the plunger 2 are the tubular structure of one end open, and the top of the spring 3 is located at plunger In 2.

Further, as shown in Figures 2 and 3, the pressure limiting valve also includes regulating bolt 5 and cover plate 6（Herein also can use and valve The valve of the bottom thread of chamber 101 connection is stifled to substitute cover plate 6）, the regulating bolt 5 can be hex bolts and be configured with nut, described Cover plate 6 is arranged on the bottom of valve body 1, and the regulating bolt 5 runs through cover plate 6 and both threaded connections, and the end of the regulating bolt 5 End contacts with closure 4（It is not attached to）, head end be located at outside cover plate 6, position of the closure 4 in valve pocket 101 is adjustable.Typically In the case of, before pressure limiting valve dispatches from the factory, staff will set position of the closure 4 in valve pocket 101 by regulating bolt 5 Put, when regulating bolt 5 turns clockwise, regulating bolt 5 promotes closure 4 to overcome the elastic force of spring 3 with respect to valve body 1 together It is moved to the left, spring 3 is compressed, and the elastic force increase of spring 3, when 5 rotate counterclockwise of regulating bolt, regulating bolt 5 is with respect to valve Body 1 moves right, and closure 4 also moves right under the elastic force effect of spring 3, close while regulating bolt 5 is stopped the rotation Capping 4 also stops movement, and now, spring 3 is upheld, and the elastic force of spring 3 reduces, it can be seen that, the position of closure 4 is different, bullet Initial elastic force namely difference when spring 3 dispatches from the factory, but if pressure limiting valve needs to change the situation of the elastic force of spring 3, work at work Personnel can also be turned regulating bolt 5 by scene and solve problems, be brought not consequently, it is possible to eliminate dismounting pressure limiting valve Just.

Preferably, as shown in Figures 2 and 3, sealing gasket 7 is set between the cover plate 6 and valve body 1, and described close O-ring 8 is set between capping 4 and the side wall of valve pocket 101, and the sealing gasket 7 and O-ring 8 can be prevented outside the fluid in valve body 1 Let out.

Above-described embodiment is the preferable implementation of the utility model, and in addition, the utility model can be with other sides Formula is realized, any on the premise of the technical program design is not departed from obviously to replace in protection model of the present utility model Within enclosing.

In order to allow those of ordinary skill in the art more easily understand the utility model relative to prior art improvement it Place, some accompanying drawings of the present utility model and description have been simplified, and for the sake of clarity, present specification is omitted one A little other elements, those of ordinary skill in the art should be aware that these elements omitted also may make up in of the present utility model Hold.

Claims

1. a kind of pressure limiting valve, including offer valve pocket（101）Valve body（1）, located at valve pocket（101）Interior plunger（2）And spring （3）, the spring（3）One end connects plunger（2）, the other end be fixed on valve pocket（101）Bottom, the valve body（1）On offer Oil inlet and oil-out, it is characterised in that：The plunger（2）Big round platform is provided with towards the end face of oil inlet（201）, it is described big Round platform（201）It is provided with small round platform（202）.

2. pressure limiting valve according to claim 1, it is characterised in that：The plunger（2）End face and big round platform（201）Diameter Difference is 0.5mm and small round platform（202）Diameter difference be 12mm, the plunger（2）With big round platform（201）The discrepancy in elevation for 47mm, with Small round platform（202）The discrepancy in elevation be 50mm.

3. pressure limiting valve according to claim 2, it is characterised in that：The plunger（2）For the tubular structure of one end open, institute State valve pocket（101）Bottom is further fixed on closure（4）, the spring（3）One end is located at plunger（2）Interior, other end connection sealing Lid（4）.

4. pressure limiting valve according to claim 3, it is characterised in that：Also include regulating bolt（5）And cover plate（6）, the lid Plate（6）Installed in valve body（1）Bottom, the regulating bolt（5）Through cover plate（6）And both threaded connections, and the regulation spiral shell Bolt（5）End and closure（4）Contact, head end are located at cover plate（6）Outside, the closure（4）In valve pocket（101）Interior position It is adjustable.

5. pressure limiting valve according to claim 4, it is characterised in that：The cover plate（6）With valve body（1）Between be provided with sealing gasket （7）, and the closure（4）With valve pocket（101）O-ring is provided between side wall（8）, the sealing gasket（7）And O-ring（8） Valve body can be prevented（1）Interior fluid leaks.