CN218407590U - Piston cooling nozzle valve structure and engine - Google Patents

Abstract

The utility model discloses a piston cooling nozzle valve structure and an engine, which solve the problems of small flow, sensitive response and large oil pressure loss in the working process of the existing nozzle valve structure and comprise a valve sleeve, a valve core and a rebound piece; the valve sleeve is provided with three sections of stepped holes and is also provided with a liquid inlet and a liquid outlet; the valve core is inserted in the valve sleeve and provided with three sections of stepped shafts, an annular groove is formed in the first shaft section along the circumferential direction to form a first transition cavity with the hole wall of the first hole section, a second transition cavity is further arranged on the valve sleeve and is connected with the jacking area of the end face of the second shaft section and communicated with the first transition cavity, and the peripheral surface of the third shaft section blocks the liquid outlet; one end of the rebound piece is fixed relative to the valve sleeve, and the other end of the rebound piece is matched with the valve core to keep the position of the valve core inserted in the valve sleeve; and in the projection of the valve core in the length direction, the jacking area is not overlapped with the first transition cavity. The utility model discloses during the use, the oil pressure loss is littleer, the liquid measure is bigger, the response is sensitive.

Description

Piston cooling nozzle valve structure and engine

Technical Field

The utility model relates to an engine cooling, lubricated technical field particularly, relate to a piston cooling nozzle valve structure and engine.

Background

Along with the continuous promotion of the dynamic property and the fuel economy of engine, the upgrading innovation that engine technical field does not stop, the load that the engine bore is bigger and bigger for the heat load that the piston bore is also increasing constantly, so for the stability and the reliability of guaranteeing engine operation, need in time and effectual cooling to the piston.

At present, the mainstream mode for reducing the heat load of the piston is to spray engine oil to cool the piston by adopting a piston cooling nozzle arranged on a main oil gallery of a cylinder block, and the action of spraying the engine oil by the piston cooling nozzle is controlled by a piston cooling nozzle valve.

The opening oil pressure value of the piston cooling nozzle valve controls the connection and disconnection of the main oil duct of the cylinder block and the oil duct of the piston cooling nozzle, so that the action of the piston cooling nozzle for injecting engine oil to the piston is controlled; however, when the engine oil flows through the piston cooling nozzle valve, oil pressure loss can be caused, and excessive oil pressure loss can cause insufficient oil pressure at the piston cooling nozzle, so that the engine oil cannot be effectively cooled due to the inability of engine oil injection; meanwhile, the opening of the piston cooling nozzle valve has a response time, and the too long response time can cause the untimely oil injection of the piston cooling nozzle, so that the cooling effect on the piston is reduced; at present, the requirement on piston cooling is higher and higher, and a piston cooling nozzle valve with larger oil flow, smaller oil pressure loss and quicker response time is needed to be arranged through a valve body, so that when the piston cooling nozzle valve is opened, engine oil sprayed by a piston cooling nozzle can meet the increasingly severe cooling requirement on an engine piston.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that how reduce the oil pressure loss that causes when machine oil flows through piston cooling nozzle valve and increase fluid flow, promote response rate that the nozzle valve was opened in order to guarantee the operational reliability and the stability of engine piston, aim at provides a piston cooling nozzle valve structure and engine.

The utility model discloses a following technical scheme realizes:

in a first aspect, the present invention provides a piston cooling nozzle valve structure, including:

the valve sleeve is provided with a first hole section, a second hole section and a third hole section, the cross-sectional areas of which are sequentially increased, and the valve sleeve is also provided with a liquid inlet and a liquid outlet;

the valve core is inserted in the valve sleeve and provided with a first shaft section, a second shaft section and a third shaft section, the cross section area of the first shaft section is sequentially increased, an annular groove connected with the end face of the second shaft section is formed in the first shaft section along the circumferential direction so as to form a first transition cavity communicated with the liquid inlet with the hole wall of the first hole section, a second transition cavity is further arranged on the valve sleeve and connected with a jacking area of the end face of the second shaft section and communicated with the first transition cavity, and the liquid outlet is blocked by the circumferential surface of the third shaft section;

one end of the rebound piece is relatively fixed with the valve sleeve, and the other end of the rebound piece is matched with the valve core to keep the position of the valve core inserted in the valve sleeve;

and in the projection of the valve core in the length direction, the jacking area is not overlapped with the first transition cavity.

In some possible embodiments, the bore bottom surface of the second bore section is a wedge surface facing the spool to form a second transition cavity with the second shaft section end surface.

In some possible embodiments, the spool is configured as a stepped circular shaft.

In some possible embodiments, the resilient member is a spring.

In some possible embodiments, a matching convex shaft is arranged on the end of the valve core, and the spring is sleeved on the matching convex shaft.

In some possible embodiments, the valve comprises a driving mechanism connected with the valve sleeve, and the driving mechanism is used for driving the valve core to move in the valve sleeve.

In some possible embodiments, the driving mechanism is an electromagnetic solenoid, wherein a core rod of the electromagnetic solenoid moves in a direction parallel to or coincident with a length direction of the valve core.

In some possible embodiments, a transition groove is disposed in the third bore section and surrounds the third shaft section, and the transition groove is in communication with the liquid outlet.

A second aspect of the present invention provides an engine, including any one of the above piston cooling nozzle valve structures, wherein, the inlet on the valve barrel communicates with the engine cylinder block main oil gallery, and the outlet on the valve barrel communicates with the piston cooling nozzle oil gallery of the engine.

A third aspect of the present invention provides a piston cooling nozzle valve structure, comprising:

the valve sleeve is provided with a first hole section, a second hole section and a third hole section, the cross-sectional areas of which are sequentially increased, and the valve sleeve is also provided with a liquid inlet and a liquid outlet;

the valve core is inserted in the valve sleeve and provided with a first shaft section, a second shaft section and a third shaft section, the cross section area of the first shaft section is sequentially increased, an annular groove connected with the end face of the second shaft section is formed in the first shaft section along the circumferential direction so as to form a third transition cavity communicated with the liquid inlet together with the hole wall of the first hole section, the end face of the second shaft section is a wedge face, the wedge face faces the valve core, and the peripheral surface of the third shaft section seals the liquid outlet;

and one end of the rebound piece is relatively fixed with the valve sleeve, and the other end of the rebound piece is matched with the valve core so as to keep the position of the valve core inserted in the valve sleeve.

In a fourth aspect, the present invention provides an engine, including a piston cooling nozzle valve structure, wherein the piston cooling nozzle valve structure includes:

the valve sleeve is provided with a first hole section, a second hole section and a third hole section, the cross-sectional areas of which are sequentially increased, and the valve sleeve is also provided with a liquid inlet and a liquid outlet;

the valve core is inserted in the valve sleeve and provided with a first shaft section, a second shaft section and a third shaft section, the cross section area of the first shaft section is sequentially increased, an annular groove connected with the end face of the second shaft section is formed in the first shaft section along the circumferential direction so as to form a third transition cavity communicated with the liquid inlet with the hole wall of the first hole section, the end face of the second shaft section is a wedge face, the wedge face faces the valve core, and the peripheral surface of the third shaft section blocks the liquid outlet;

one end of the rebound piece is relatively fixed with the valve sleeve, and the other end of the rebound piece is matched with the valve core to keep the position of the valve core inserted in the valve sleeve;

the liquid inlet on the valve sleeve is communicated with the main oil duct of the engine cylinder body, and the liquid outlet on the valve sleeve is communicated with the piston cooling nozzle oil duct of the engine.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

the embodiment of the utility model provides a pair of piston cooling nozzle valve structure and engine, through the setting of third shaft section, after fluid got into third hole section, the effect face area of fluid on the case suddenly increased, and the case can the quick response action in order to open the liquid outlet under the pressure effect of fluid, guarantees that piston cooling nozzle has the machine oil of great liquid measure in the stage of initial oil spout to can reduce the oil pressure loss.

Drawings

In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic longitudinal sectional structure view of a piston cooling nozzle valve structure provided in an installation state according to an embodiment of the present invention;

fig. 2 is a schematic view of a valve sleeve structure provided in an embodiment of the present invention;

fig. 3 is a schematic view of a valve core structure provided in an embodiment of the present invention;

fig. 4 is a schematic structural view of a piston cooling nozzle valve when the valve core is located at an initial position according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a piston cooling nozzle valve when a liquid inlet and a liquid outlet are communicated by a valve core provided by the embodiment of the invention;

fig. 6 is a schematic structural view of a piston cooling nozzle valve when the valve core returns to the initial position according to an embodiment of the present invention;

fig. 7 is a partial schematic structural view of another piston cooling nozzle valve structure according to an embodiment of the present invention;

FIG. 8 is a schematic diagram showing the relationship between the oil pressure in the main oil gallery of the cylinder block and the oil flow rate through the valve body;

fig. 9 is a diagram illustrating a relationship between a cylinder block main gallery oil pressure and a piston cooling nozzle gallery oil pressure.

Reference numbers and corresponding part names in the drawings:

1-a valve sleeve, 2-a valve core, 3-a rebound part, 4-a driving mechanism and 5-a cylinder body;

11-a first hole section, 12-a second hole section, 13-a third hole section, 14-a liquid inlet, 15-a liquid outlet;

21-a first shaft section, 22-a second shaft section, 23-a third shaft section, 24-an end face of the second shaft section, 25-an end face of the third shaft section, 26-an annular groove and 27-a convex shaft;

51-cylinder block main oil gallery, 52-piston cooling nozzle oil gallery.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.

Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or examples are included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "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 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 therefore, should not be construed as limiting the scope of the present invention.

In a first aspect, as shown in fig. 1 to 3, an embodiment of the present invention provides a piston cooling nozzle valve structure, which includes a valve sleeve 1, a valve core 2 and a resilient member 3; the valve sleeve 1 is provided with a first hole section 11, a second hole section 12 and a third hole section 13 with sequentially increased cross-sectional areas, and the valve sleeve 1 is also provided with a liquid inlet 14 and a liquid outlet 15; the valve core 2 is inserted in the valve sleeve 1 and is provided with a first shaft section 21, a second shaft section 22 and a third shaft section 23, the cross section areas of the first shaft section 21, the second shaft section 22 and the third shaft section 23 are sequentially increased, an annular groove 26 connected with an end face 24 of the second shaft section is formed in the first shaft section 21 along the circumferential direction so as to form a first transition cavity communicated with the liquid inlet 14 together with the hole wall of the first hole section 11, a second transition cavity is further arranged on the valve sleeve 1 and is connected with a jacking area of the end face 24 of the second shaft section and communicated with the first transition cavity, and the peripheral surface of the third shaft section 23 blocks the liquid outlet 15; one end of the rebound piece 3 is fixed relative to the valve sleeve 1, and the other end of the rebound piece is matched with the valve core 2 to keep the position of the valve core 2 inserted in the valve sleeve 1; wherein, on the projection of the valve core 2 in the length direction, the jacking area is not coincident with the first transition cavity.

In the embodiment of the present application, the first hole section 11, the second hole section 12 and the third hole section 13 in the valve housing 1 are straight holes, the liquid inlet 14 on the valve housing 1 is communicated with the first hole section 11, and the liquid outlet 15 is communicated with the third hole section 13. The cross-sectional shapes of the first, second and third bore sections 11, 12, 13 may be the same or different, as long as the cross-sectional area size relationship is ensured. In a possible embodiment, the first hole section 11, the second hole section 12 and the third hole section 13 have the same cross-sectional shape and are all set to be circular, so that on one hand, the processing difficulty is reduced, and on the other hand, the valve sleeve 1 and the valve core 2 are ensured to have better relative mobility and sealing performance after being matched. Before the annular groove 26 is formed, the first shaft section 21 is in surface-to-surface contact with the first bore section 11 in the circumferential direction, after the annular groove 26 is formed, the valve element 2 and the valve housing 1 form a first transition chamber which is sealed relative to each other, and the second shaft section 22 and the third shaft section 23 are in surface-to-surface contact with the second bore section 12 and the third bore section 13 in the circumferential direction, respectively.

In this embodiment, the deformation amount of the resilient member 3 should be at least greater than the maximum distance between the third shaft end 25 and the liquid outlet 15, and the liquid inlet 14 should still be communicated with the first transition cavity when the third shaft end 25 passes through the liquid outlet 15.

In the embodiment of the application, the first transition cavity and the second transition cavity can form an integral cavity; instead of forming an integral chamber, the first transition chamber and the second transition chamber may be connected by providing an oil passage in the valve housing 1. For example, a groove is formed in the bottom surface of the second bore section 12 to serve as a second transition chamber, which facilitates the contact of the second bore section end surface 24 when the second bore section end surface 24 is in contact with the bottom of the second bore section 12, and the second transition chamber and the first transition chamber communicate with each other by providing an oil passage in the valve sleeve 1. Certainly, in the implementation process, the first transition cavity and the second transition cavity are preferably set to be an integral cavity to reduce the processing difficulty of the valve sleeve 1, and meanwhile, engine oil is enabled to enter the second transition cavity more quickly; for example, in one possible embodiment, the bottom surface of the second bore section 12 is a wedge surface facing the valve element 2 to form a second transition chamber with the second bore section end surface 24, and the edge of the wedge surface may contact either the second bore section end surface 24 or the edge of the second bore section end surface 24.

In the embodiment of the present application, the acting force of the rebound component 3 to keep the valve core 2 in the valve sleeve 1 can be a pushing force or a pulling force. For maintenance, in a possible embodiment, the resilient member 3 holds the position of the valve element 2 in the valve housing 1 by pushing force, and specifically, the resilient member 3 is located in the third hole section 13, one end of the resilient member 3 is fixed relative to the valve housing 1, and the other end of the resilient member 3 cooperates with the valve element 2 to provide the pushing force for the valve element 2 so that the position of the valve element 2 in the valve housing 1 is held.

In the embodiment of the present application, the resilient member 3 and the valve housing 1 may be directly connected to each other, or may be fixed to each other through an intermediate connecting member. In a possible embodiment, the spring-back member 3 is connected to the valve housing 1 via a drive mechanism 4. The drive means 4 has a free end which, when free, can act on the valve element 2 to move the valve element 2 in the valve housing 1.

In a possible embodiment, the drive mechanism 4 may be configured as an electromagnetic solenoid, wherein the core rod of the electromagnetic solenoid serves as the movable end of the drive mechanism 4. When the electromagnetic solenoid acts on the valve core 2, the motion is sensitive, so that the valve core 2 can be ensured to move sensitively.

In this application embodiment, for the convenience of making, resilience piece 3 can be configured into the spring to set up protruding axle 27 on third axle section terminal surface 25, a spring pot head is established on protruding axle 27, and the other pot head of spring is established on actuating mechanism 4, and the maintenance work in later stage can be convenient for to such mounting means.

At the moment when the engine oil enters the liquid outlet 15, since the engine oil is released, the pressure of the engine oil acting on the end surface 25 of the third shaft section may not be uniform, and at this time, the valve element 2 may bear a certain pressure in the radial direction, which may affect the motion stability of the valve element 2, therefore, in some possible embodiments, a transition groove surrounding the third shaft section 23 may be disposed in the third hole section 13, and the transition groove is communicated with the liquid outlet 15.

The working principle is as follows: the description will be given taking as an example a configuration in which the hole bottom surface of the second hole section 12 is provided as a wedge surface and the edge of the wedge surface is in contact with the edge of the second shaft section end surface 24. The diameter of the first shaft section 21 on the valve core 2 is d1, the diameter of the second shaft section 22 is d2, and the diameter of the third shaft section 23 is d3. In the initial state, the effective acting area of the engine oil in the axial direction of the valve element 2 is Δ S1, where Δ

After the engine oil enters the third bore section 13, the effective active area of the engine oil in the axial direction of the valve element 2 is Δ S2, wherein

As shown in fig. 4, when the initial spring force of the spring acting on the valve core 2 is F1 (the stiffness of the spring is K), the oil pressure value of the cylinder block main oil gallery 51 is less than or equal to P0 (P0 is the minimum oil pressure required for pushing the valve core 2 to move), the valve core 2 is at the initial position of completely disconnecting the liquid inlet 14 from the liquid outlet 15, that is, the liquid outlet 15 is blocked by the circumferential surface of the third shaft section 23, the distance from the groove wall of the annular groove 26 on the first shaft section 21 away from the second shaft section 22 to the liquid inlet 14 is L, and the distance from the end surface 25 of the third shaft section to the liquid outlet 15 is also L; when the oil pressure is P0, only the groove wall of the annular groove 26 and the second axial end surface 24 receive the oil pressure, and the oil pressure applied to the valve element 2 is F0= P0 × Δ S1, and F0= F1.

When the oil pressure value of the cylinder block main oil gallery 51 reaches P1 (P1 is an opening pressure value of the piston cooling nozzle valve), the valve element 2 compresses the spring and moves by a distance of L1 with respect to the initial position, at this time, the third shaft section end surface 25 of the valve element 2 is about to receive the oil pressure, only the groove wall of the annular groove 26 and the second shaft section end surface 24 receive the oil pressure at the moment before the oil pressure acts on the third shaft section end surface 25, the hydraulic pressure of the oil acting on the valve element 2 is F2= P1 Δ S1, the spring force generated by the spring is F3= F1+ K L1, and F2= F3; when the third shaft section end face 25 bears the oil pressure, the groove wall of the annular groove 26, the second shaft section end face 24 and the third shaft section end face 25 all bear the oil pressure, so that the hydraulic pressure of the engine oil acting on the valve element 2 is instantly increased to F4= P1 × Δ S2, the spring force is still F3, and the valve element 2 can rapidly move to compress the spring due to the sudden increase of the hydraulic pressure; as shown in fig. 5, the distance moved by the compression spring of the valve core 2 is L2, where L2= L-L1, so that the annular groove 26 is away from the groove wall of the second shaft section 22 to the position of the liquid inlet 14, the end surface 25 of the third shaft section reaches the position of the liquid outlet 15, and the liquid inlet 14 and the liquid outlet 15 are completely communicated through the annular groove 26 on the valve core 2, where the spring force is F5= F3+ K L2= F1+ K L, and F4= F5.

As shown in fig. 6, the maximum operating oil pressure of the cylinder block main gallery 51 is P2, the hydraulic pressure generated at this time is F6= P2 Δ S2, the electromagnetic force generated when the electromagnetic solenoid is energized is F7, and F7+ F1 ≧ F6; therefore, the valve core 2 can be forcibly pushed to move to a position where the liquid inlet 14 and the liquid outlet 15 can be completely disconnected under the action of electromagnetic force, and the piston cooling nozzle valve is forcibly closed.

According to the piston cooling nozzle valve structure, the grading control of the piston cooling nozzle valve can be realized through the matching design of the spring force generated by the spring, the hydraulic pressure generated by the oil pressure of the cylinder body main oil duct 51, the multi-stage step hole structure of the valve sleeve 1 and the multi-stage step structure of the valve core 2, so that the oil passing through the valve body after the piston cooling nozzle valve is opened meets the use requirements of larger flow, smaller oil pressure loss and quicker opening response speed.

The matching design relation is as follows:

F0＝P0*△S1；

F0＝F1；

F2＝P1*△S1；

F3＝F1+K*L1；

F2＝F3；

F4＝P1*△S2；

F5＝F1+K*L；

F4＝F5；

F6＝P1*△S2；

F7+F1≥F6；

the symbols of the above relation have the following meanings:

delta S1 is the effective area of the annular groove 26 of the valve core 2 far away from the groove wall of the second shaft section 22 and the end face 24 of the second shaft section under the action of oil pressure.

Delta S2 is the effective area of the annular groove 26 of the valve core 2 far away from the groove wall of the second shaft section 22, the end face 24 of the second shaft section and the end face 25 of the third shaft section when bearing the oil pressure.

P0-minimum oil pressure required to move the poppet 2.

P1-opening oil pressure of the piston cooling nozzle valve.

K is the spring rate.

L-the distance the valve element 2 can move in the valve sleeve 1.

L1 — the distance the oil pressure is about to act on the third shaft section end face 25, the valve element 2 moves in the valve sleeve 1.

P2 — maximum working oil pressure value of the cylinder block main oil passage 51.

F1-initial spring force.

F2 — hydraulic pressure acting on the valve element 2 (when the cylinder block main oil gallery 51 reaches the opening pressure value, the third shaft section end face 25 is not yet acting).

F3-the spring force acting on the spool 2 (when the spring is pushed by the spool 2 to compress the distance L1).

F4 — hydraulic pressure acting on the valve element 2 (when the cylinder block main oil gallery 51 reaches the opening pressure value, the third shaft section end face 25 has already been acted on).

F5-the spring force acting on the spool 2 (when the spring is pushed by the spool 2 to compress the distance L).

F6 — hydraulic pressure acting on the spool 2 (when the cylinder block main gallery 51 reaches the maximum operating oil pressure value).

F7-electromagnetic force generated by electrifying the electromagnetic solenoid.

Fig. 8 shows the relationship between the cylinder block main gallery 51 oil pressure and the oil flow rate through the valve body; in fig. 8, the comparative example is such that the third shaft section 23 and the third bore section 13 are not provided with respect to the valve housing 1 of the above-described embodiment; as can be seen from fig. 8, the piston cooling nozzle valve structure of the embodiment of the present application has a larger flow rate than the piston cooling nozzle valve structure of the comparative example, with the same oil pressure in the block main oil gallery 51.

Fig. 9 shows the relationship between the cylinder block main oil passage 51 oil pressure and the piston cooling nozzle oil passage 52 oil pressure; in fig. 9, the comparative example is such that the third shaft section 23 and the third bore section 13 are not provided with respect to the valve housing 1 of the above-described embodiment; as can be seen from fig. 9, the piston cooling nozzle valve structure of the embodiment of the present application has less oil pressure loss than the piston cooling nozzle valve structure of the comparative example, after the piston cooling nozzle valve opening piston cooling nozzle oil passage 52 has oil pressure.

In a second aspect, the present invention provides an engine, including any one of the above piston cooling nozzle valve structures, wherein, inlet 14 on the valve housing 1 communicates with the engine cylinder block main oil gallery 51, and outlet 15 on the valve housing 1 communicates with the piston cooling nozzle oil gallery 52 of the engine.

In a third aspect, the present invention provides a piston cooling nozzle valve structure, which comprises a valve housing 1, a valve core 2 and a resilient member 3; the valve sleeve 1 is provided with a first hole section 11, a second hole section 12 and a third hole section 13 with sequentially increased cross-sectional areas, and the valve sleeve 1 is also provided with a liquid inlet 14 and a liquid outlet 15; the valve core 2 is inserted in the valve sleeve 1 and is provided with a first shaft section 21, a second shaft section 22 and a third shaft section 23, the cross-sectional areas of which are sequentially increased, an annular groove 26 connected with an end surface 24 of the second shaft section is formed on the first shaft section 21 along the circumferential direction so as to form a third transition cavity communicated with the liquid inlet 14 with the hole wall of the first hole section 11, the end surface 24 of the second shaft section is a wedge surface facing the valve core 2, and the peripheral surface of the third shaft section 23 seals the liquid outlet 15; one end of the resilient member 3 is fixed relative to the valve housing 1, and the other end thereof cooperates with the valve core 2 to maintain the position of the valve core 2 inserted in the valve housing 1.

It can be understood that, as shown in fig. 7, unlike the piston cooling nozzle valve structure described above, in the present embodiment, the bottom surface of the third hole section 13 in the piston cooling nozzle valve structure described above is changed into a wedge surface, the second shaft section end surface 24 is a wedge surface, and the second shaft section end surface 24 faces the valve core 2 when the second shaft section end surface 24 is a wedge surface.

In a fourth aspect, the present invention provides an engine, comprising a piston cooling nozzle valve structure, wherein the piston cooling nozzle valve structure comprises a valve sleeve 1, a valve core 2 and a rebound component 3; the valve sleeve 1 is provided with a first hole section 11, a second hole section 12 and a third hole section 13 with sequentially increased cross-sectional areas, and the valve sleeve 1 is also provided with a liquid inlet 14 and a liquid outlet 15; the valve core 2 is inserted in the valve sleeve 1 and is provided with a first shaft section 21, a second shaft section 22 and a third shaft section 23, the cross-sectional areas of which are sequentially increased, an annular groove 26 connected with an end surface 24 of the second shaft section is formed on the first shaft section 21 along the circumferential direction so as to form a third transition cavity communicated with the liquid inlet 14 with the hole wall of the first hole section 11, the end surface 24 of the second shaft section is a wedge surface facing the valve core 2, and the peripheral surface of the third shaft section 23 blocks the liquid outlet 15; one end of the rebound part 3 is fixed relative to the valve sleeve 1, and the other end of the rebound part is matched with the valve core 2 to keep the position of the valve core 2 inserted in the valve sleeve 1; the liquid inlet 14 of the valve sleeve 1 is communicated with the main oil passage 51 of the engine cylinder body, and the liquid outlet 15 of the valve sleeve 1 is communicated with the piston cooling nozzle oil passage 52 of the engine.

The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A piston cooling nozzle valve structure, comprising:

the valve sleeve (1) is provided with a first hole section (11), a second hole section (12) and a third hole section (13) which are sequentially increased in cross-sectional area, and a liquid inlet (14) and a liquid outlet (15) are formed in the valve sleeve (1);

the valve core (2) is inserted into the valve sleeve (1) and provided with a first shaft section (21), a second shaft section (22) and a third shaft section (23) which are sequentially increased in cross-sectional area, an annular groove (26) connected with an end face (24) of the second shaft section is formed in the first shaft section (21) along the circumferential direction so as to form a first transition cavity communicated with the liquid inlet (14) with a hole wall of the first hole section (11), a second transition cavity is further arranged on the valve sleeve (1), the second transition cavity is connected with a jacking area of the end face (24) of the second shaft section and communicated with the first transition cavity, and the peripheral surface of the third shaft section (23) blocks the liquid outlet (15);

one end of the rebound piece (3) is fixed relative to the valve sleeve (1), and the other end of the rebound piece is matched with the valve core (2) to keep the position of the valve core (2) inserted in the valve sleeve (1);

wherein, on the projection of the valve core (2) in the length direction, the jacking area is not overlapped with the first transition cavity.

2. Piston-cooled nozzle valve arrangement according to claim 1, characterised in that the bore bottom surface of the second bore section (12) is a wedge surface facing the spool (2) to form a second transition chamber with the second shaft section end surface (24).

3. Piston cooling nozzle valve arrangement according to claim 1, characterized in that the spool (2) is configured as a stepped circular shaft.

4. Piston cooling nozzle valve arrangement according to claim 1, characterized in that the resilient member (3) is a spring.

5. Piston cooling nozzle valve structure according to claim 4, characterized in that the end of the valve core (2) is provided with a mating protruding shaft (27), and the spring is sleeved on the mating protruding shaft (27).

6. Piston cooling nozzle valve arrangement according to claim 1, characterized in that it further comprises a drive mechanism (4) connected to the valve housing (1), the drive mechanism (4) being adapted to move the valve element (2) within the valve housing (1).

7. Piston cooling nozzle valve arrangement according to claim 6, characterized in that the drive mechanism (4) is an electromagnetic solenoid, wherein the direction of movement of the plunger of the electromagnetic solenoid is parallel or coincides with the length direction of the valve spool (2).

8. A piston-cooled nozzle valve arrangement according to claim 1, characterised in that a transition groove is provided in the third bore section (13) around the third shaft section (23), which transition groove communicates with the liquid outlet (15).

9. A piston cooling nozzle valve structure, comprising:

the valve sleeve (1) is provided with a first hole section (11), a second hole section (12) and a third hole section (13) which are sequentially increased in cross-sectional area, and a liquid inlet (14) and a liquid outlet (15) are formed in the valve sleeve (1);

the valve core (2) is inserted into the valve sleeve (1) and provided with a first shaft section (21), a second shaft section (22) and a third shaft section (23), the cross-sectional areas of the first shaft section (21) are sequentially increased, an annular groove (26) connected with the end face (24) of the second shaft section is formed in the first shaft section (21) along the circumferential direction so as to form a third transition cavity communicated with the liquid inlet (14) with the hole wall of the first hole section (11), the end face (24) of the second shaft section is a wedge face, the wedge face faces towards the valve core (2), and the circumferential face of the third shaft section (23) blocks the liquid outlet (15);

and one end of the rebound piece (3) is relatively fixed with the valve sleeve (1), and the other end of the rebound piece is matched with the valve core (2) to keep the position of the valve core (2) inserted in the valve sleeve (1).

10. An engine comprising a piston cooling nozzle valve arrangement according to any one of claims 1 to 8, wherein the fluid inlet (14) of the valve housing (1) is in communication with the engine block main oil gallery (51) and the fluid outlet (15) of the valve housing (1) is in communication with the engine piston cooling nozzle oil gallery (52).

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