Inner cooling oil cavity, oil cooling piston and engine

Abstract

The utility model discloses an inner cooling oil chamber, oil cooling piston and engine, including: inner cooling oil chamber body, including oil chamber body lower part and oil chamber body upper part, oil chamber body upper part at least includes first vortex area and second vortex area, first vortex area is closer to piston center than second vortex area, and the first vortex area is closer to piston center than second vortex area. The second vortex region is closer to the piston ring groove than the first vortex region. Engine oil is sprayed into the oil inlet channel through an engine oil pump and enters the inner cooling oil cavity body through the oil inlet channel. Along with rapid and high-frequency up-and-down movement of the piston, engine oil continuously collides with the upper wall face and the lower wall face of the inner cooling oil cavity body under the action of inertia force, part of the engine oil impacts the first vortex area to form a first vortex, and part of the engine oil impacts the second vortex area to form a second vortex. The contact area of engine oil and the inner cooling oil cavity body is increased, the flowing speed of the engine oil in the vortex area is higher, a better cooling effect is generated, the temperature of a piston can be more effectively reduced, and the phenomenon that the engine oil in the inner cooling oil cavity is coked is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine, more specifically, relate to an inner cooling oil cavity, oil cooling piston and engine. BACKGROUND

[0002] At present, the temperature cooling of the internal combustion engine piston is mainly by the oil in the inner cooling oil cavity of the piston to take away the heat, the oil flows in the inner cooling oil cavity, and the heat of the piston combustion chamber and the ring groove is taken away by the way of heat conduction, therefore, the flow speed of the oil in the inner cooling oil cavity of the piston has an important influence on the cooling performance of the piston.

[0003] With higher demand for the performance indicators such as power of the internal combustion engine, the in-cylinder combustion environment becomes more demanding, the in-cylinder pressure, combustion temperature and other values increase, the thermal load increases, in order to ensure the normal operation of the internal combustion engine, avoid the coking of the oil in the inner cooling oil cavity and the ring groove, cause the problems such as abnormal temperature of the piston, carbon deposition and ring group movement stagnation, higher requirements are put forward for the heat dissipation capacity of the piston in the operation process.

[0004] Therefore, how to improve the flow speed of the oil in the inner cooling oil cavity to take away more heat and avoid the problems such as high temperature of the piston, coking of the oil in the inner cooling oil cavity and carbon deposition in the ring groove is a problem to be solved by the person skilled in the art. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims at providing an inner cooling oil cavity to improve the flow speed of the oil in the inner cooling oil cavity, take away more heat, and avoid the problems such as high temperature of the piston, coking of the oil in the inner cooling oil cavity and carbon deposition in the ring groove;

[0006] Another purpose of the utility model is to provide an oil cooling piston and an engine with the above-mentioned inner cooling oil cavity.

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] An inner cooling oil cavity comprises:

[0009] The inner cooling oil cavity body comprises an oil cavity body lower part and an oil cavity body upper part, the oil cavity body upper part comprises at least a first vortex area and a second vortex area, the first vortex area is closer to the piston center than the second vortex area, and the second vortex area is closer to the piston ring groove than the first vortex area;

[0010] The oil inlet channel and the oil return channel are both communicated with the oil cavity body lower part.

[0011] Optionally, in the above-mentioned inner cooling oil cavity, the bottom of the oil cavity body lower part forms a third vortex area.

[0012] Optionally, in the inner cooling oil cavity, the side wall of the first vortex area away from the second vortex area is a first vortex forming side wall;

[0013] the side wall of the second vortex area away from the first vortex area is a second vortex forming side wall;

[0014] the first vortex forming side wall and the second vortex forming side wall are both curved surfaces, and the first vortex forming side wall extends towards the second vortex forming side wall, and the second vortex forming side wall extends towards the first vortex forming side wall.

[0015] Optionally, in the inner cooling oil cavity, the vortex rotation direction of the third vortex area is the same as that of the first vortex area.

[0016] Optionally, in the inner cooling oil cavity, the first vortex area and the second vortex area are connected by a transition inner wall curved surface, and the transition inner wall curved surface protrudes towards the bottom of the lower part of the oil cavity body.

[0017] The first vortex area and the second vortex area are both connected to the transition inner wall curved surface through a rounded corner transition.

[0018] Optionally, in the inner cooling oil cavity, the oil inlet of the oil inlet channel is a tapered port, and the hole diameter gradually decreases from the end away from the inner cooling oil cavity body to the end close to the inner cooling oil cavity body.

[0019] Optionally, in the inner cooling oil cavity, the oil inlet channel and the oil return channel are symmetrically arranged along the center line of the inner cooling oil cavity body.

[0020] The oil inlet channel corresponds to the main push side of the piston, and the oil return channel corresponds to the secondary push side of the piston.

[0021] The inner cooling oil cavity provided by the utility model has the first vortex area and the second vortex area designed on the upper part of the oil cavity body, the first vortex area is close to the center of the piston, and the second vortex area is close to the ring groove of the piston. The oil is sprayed into the oil inlet channel by the oil pump, and then enters the inner cooling oil cavity body. With the rapid and high-frequency up-down movement of the piston, the oil continuously collides with the upper wall surface and the lower wall surface of the inner cooling oil cavity body under the action of inertial force, part of the oil impacts the first vortex area to form a first vortex, and part of the oil impacts the second vortex area to form a second vortex, thereby increasing the contact area of the oil and the inner cooling oil cavity body, the flow speed of the oil in the vortex area is greater, a better cooling effect is generated, the temperature of the piston can be effectively reduced, and the coking phenomenon of the oil in the inner cooling oil cavity is reduced.

[0022] An oil-cooled piston comprises a piston body and an inner oil cooling cavity formed in the piston body, the inner oil cooling cavity being as claimed in any one of the preceding claims.

[0023] The oil inlet of the oil inlet channel corresponds to the oil nozzle.

[0024] Optionally, in the oil-cooled piston described above, the inner oil cooling cavity body is coaxially arranged with the piston body.

[0025] The oil-cooled piston provided by the utility model has all the technical effects of the inner oil cooling cavity, which will not be described herein again.

[0026] An engine comprises the oil-cooled piston as described above.

[0027] The engine provided by the utility model has all the technical effects of the oil-cooled piston, which will not be described herein again. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0029] Figure 1 A sectional view of the oil-cooled piston disclosed by the embodiments of the utility model in one section;

[0030] Figure 2 A sectional view of the oil-cooled piston disclosed by the embodiments of the utility model in another section;

[0031] Figure 3 For Figure 2 A local enlarged view of the area A in the middle;

[0032] Figure 4 A structure schematic view of the inner oil cooling cavity disclosed by the embodiments of the utility model;

[0033] Figure 5 A contour view of the inner oil cooling cavity body disclosed by the embodiments of the utility model.

[0034] The meanings of various reference signs in the drawings are as follows:

[0035] 100 - oil inlet channel; 101 - conical port;

[0036] 200 - oil return channel;

[0037] 300 - inner cooling oil cavity body; 301 - lower part of oil cavity body; 302 - first vortex area; 3021 - first vortex forming side wall; 303 - second vortex area; 3031 - second vortex forming side wall; 304 - recess;

[0038] 400 - piston body. DETAILED DESCRIPTION

[0039] The core of the utility model lies in providing an inner cooling oil cavity, an oil-cooled piston and an engine to improve the flow speed of the engine oil in the inner cooling oil cavity, to take away more heat, to avoid high temperature of the piston, coking of the engine oil in the inner cooling oil cavity and carbon deposition in the ring groove and other problems.

[0040] Hereinafter, the embodiments will be described with reference to the drawings. In addition, the embodiments shown below do not have any limiting effect on the utility model content recited in the claims. In addition, the entire content of the configuration represented in the following embodiments is not limited to being necessary as a solution to the utility model recited in the claims. It should be noted that, for the convenience of description, only the parts related to the utility model are shown in the drawings. In the case of no conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0041] As shown in Figure 1 and Figure 4 The inner cooling oil cavity disclosed in the utility model embodiment is used for being opened on the piston body 400 to pass in the engine oil to cool the piston body 400. The inner cooling oil cavity comprises an inner cooling oil cavity body 300, an oil inlet channel 100 and an oil return channel 200.

[0042] As shown in Figures 2-5 The inner cooling oil cavity body 300 comprises an oil cavity body lower part 301 and an oil cavity body upper part, and the oil cavity body upper part at least comprises a first vortex area 302 and a second vortex area 303, and the first vortex area 302 and the second vortex area 303 are all convex to the direction away from the oil cavity body lower part 301, that is, extending upwards. In order to be able to form two vortex areas (that is, the first vortex area 302 and the second vortex area 303), a recessed part 304 is arranged downwards in the oil cavity body upper part, and the oil cavity body upper part is divided into two parts through the recessed part 304 to form the first vortex area 302 and the second vortex area 303 respectively. It should be noted that the recessed part 304 is formed by the convexity of the solid part of the piston body 400 to the direction of the inner cooling oil cavity body 300.

[0043] The first vortex area 302 is closer to the center of the piston than the second vortex area 303, and the second vortex area 303 is closer to the piston ring groove than the first vortex area 302, that is, the first vortex area 302 is closer to the inner side of the piston body 400, and the second vortex area 303 is closer to the outer side of the piston body 400.

[0044] The inner cooling oil cavity disclosed in the embodiment of the utility model, the first vortex area 302 and the second vortex area 303 are designed on the lower part 301 of the oil cavity body, and the first vortex area 302 is closer to the center of the piston, and the second vortex area 303 is closer to the piston ring groove. The oil is sprayed into the oil inlet channel 100 by the oil pump, and enters the inner cooling oil cavity body 300 from the oil inlet channel 100. With the rapid and high-frequency up-and-down movement of the piston, the oil continuously collides with the upper wall and the lower wall of the inner cooling oil cavity body 300 under the action of inertial force, part of the oil impacts the first vortex area 302 to form a first vortex, and part of the oil impacts the second vortex area 303 to form a second vortex, which increases the contact area of the oil and the inner cooling oil cavity, and the oil flow speed in the vortex area is larger, which produces a better cooling effect, can more effectively reduce the temperature of the piston, and reduces the coking phenomenon of the oil in the inner cooling oil cavity.

[0045] Further, the bottom of the lower part 301 of the oil cavity body forms a third vortex area. Those skilled in the art can understand that, whether it is the first vortex area 302, the second vortex area 303 or the third vortex area, the reason why the vortex can be formed in the area is that the wall surface of the area is a curved surface, and the oil flows along the curved surface and is guided by the curved surface to form a vortex.

[0046] Specifically, the side wall of the first vortex area 302 away from the second vortex area 303 is a first vortex forming side wall 3021, and correspondingly, the side wall of the second vortex area 303 away from the first vortex area 302 is a second vortex forming side wall 3031. The first vortex forming side wall 3021 and the second vortex forming side wall 3031 are both curved surfaces.

[0047] In order to ensure that the oil can flow along the first vortex forming side wall 3021 and the second vortex forming side wall 3031, the first vortex forming side wall 3021 should be curved towards the second vortex area 303, and the second vortex forming side wall 3031 should be curved towards the first vortex area 302, the first vortex forming side wall extends towards the second vortex forming side wall, and the second vortex forming side wall extends towards the first vortex forming side wall.

[0048] In this embodiment, the third vortex zone has the same vortex rotation direction as the first vortex zone 302. The oil beam enters the inner cooling oil cavity body through the oil inlet channel 100. With the rapid and high-frequency up-and-down movement of the piston, the oil continuously collides with the upper wall and the lower wall of the inner cooling oil cavity body 300 under the action of inertial force. Part of the oil contacts the lower wall of the inner cooling oil cavity body, forming a third vortex in the first rotation direction, accelerating the flow speed of the oil. Another part of the oil impacts the first vortex zone 302 at the upper part of the inner cooling oil cavity body 300, flows along the first vortex formation side wall 3021 to form a first vortex in the first rotation direction. Since the directions of the two first vortexes and the third vortex are the same, the flow speed of the oil is superimposed on each other, increasing the flow speed of the oil close to the side wall of the piston center, producing a better cooling effect, effectively reducing the temperature of the piston, and reducing the coking phenomenon of the oil in the inner cooling oil cavity.

[0049] Further, the first vortex zone 302 and the second vortex zone 303 are connected by a transition inner wall curve, that is, the inner wall surface of the recess 304 is a curved surface. The transition inner wall curve protrudes towards the bottom of the lower part 301 of the oil cavity body. The first vortex zone 302 and the second vortex zone 303 are both connected to the transition inner wall curve by a rounded corner transition, reducing the resistance of the oil flowing along the inner wall and improving the flow speed.

[0050] In order to ensure that the oil beam can be better injected into the oil inlet channel 100, in this embodiment, the oil inlet of the oil inlet channel 100 is designed as a tapered port 101. The diameter of the tapered port 101 gradually decreases from the end far away from the inner cooling oil cavity body 300 to the end close to the inner cooling oil cavity body 300. The oil nozzle port is located below the tapered port 101. Since the large-diameter end of the tapered port 101 is arranged towards the oil nozzle port, the oil nozzle port can more easily inject the oil beam into the oil inlet channel 100 through the tapered port 101 and into the inner cooling oil cavity body 300 through the oil inlet channel 100 to participate in the cooling of the piston body 400.

[0051] Further, in this embodiment, the oil inlet channel 100 can be arranged at a position corresponding to the main thrust side of the piston, and the oil return channel 200 can be arranged at a position corresponding to the auxiliary thrust side of the piston. Since the main thrust side is the exhaust end, the temperature of the exhaust end is higher than that of the intake end. Therefore, by distributing the oil inlet channel 100 on the main thrust side and the oil return channel 200 on the auxiliary thrust side, the lower-temperature oil can be sprayed on the high-temperature area of the main thrust side, which helps to better reduce the temperature of the piston.

[0052] The utility model discloses an oil cooling piston, comprising piston body 400 and the inner cooling oil cavity of setting on piston body 400, and the inner cooling oil cavity is the inner cooling oil cavity disclosed in the above embodiment, wherein the oil inlet of oil inlet channel 100 corresponds with the oil nozzle.

[0053] The oil cooling piston disclosed by the utility model has the above-mentioned inner cooling oil cavity, and therefore has all the technical effects of the above-mentioned inner cooling oil cavity, which will not be repeated here.

[0054] The utility model discloses an engine, which comprises the oil cooling piston disclosed in the above embodiment. The engine oil cooling piston provided by the utility model has the above-mentioned oil cooling piston, and therefore has all the technical effects of the above-mentioned oil cooling piston, which will not be repeated here.

[0055] As shown in the present application and claims, unless the context clearly indicates otherwise, "one", "a", "an" and / or "the" do not refer to the singular, but can also include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The element defined by the phrase "comprising a" does not exclude the presence of another identical element in the process, method, product or device comprising the element.

[0056] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection, etc. should be understood broadly, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0057] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0058] The principle and implementation mode of the utility model are described by using specific examples in the present application. The above embodiment is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principle of the utility model, some improvements and modifications can be made to the utility model, and these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. An internal oil cooling cavity characterized by, include: The inner cooling oil cavity body (300) comprises a lower portion (301) of the oil cavity body and an upper portion of the oil cavity body, wherein the upper portion of the oil cavity body comprises at least a first vortex area (302) and a second vortex area (303), wherein the first vortex area (302) is closer to the piston center than the second vortex area (303), and the second vortex area (303) is closer to the piston ring groove than the first vortex area (302); An oil inlet channel (100) and an oil return channel (200), both of which are in communication with the lower portion (301) of the oil chamber body.

2. The internal coolant gallery of claim 1, wherein A third vortex zone is formed at the bottom of the lower portion (301) of the oil chamber body.

3. The internal coolant gallery of claim 2, wherein, A side wall of the first vortex region (302) that is away from the second vortex region (303) is a first vortex-forming side wall (3021); The side wall of the second vortex region (303) away from the first vortex region (302) is a second vortex forming side wall (3031); The first vortex-forming sidewall (3021) and the second vortex-forming sidewall (3031) are both curved surfaces, and the first vortex-forming sidewall (3021) extends in the direction of the second vortex-forming sidewall (3031), and the second vortex-forming sidewall (3031) extends in the direction of the first vortex-forming sidewall (3021).

4. The internal coolant gallery of claim 3 wherein, The vortex rotation direction of the third vortex zone is the same as the vortex rotation direction of the first vortex zone (302).

5. The internal coolant oil gallery of claim 3 wherein, The first vortex zone (302) and the second vortex zone (303) are connected via a transition inner wall curved surface, and the transition inner wall curved surface protrudes toward the bottom of the lower portion (301) of the oil chamber body; The first eddy current zone (302) and the second eddy current zone (303) are transitioned to the transition inner wall curved surface through fillet transition.

6. An internal oil gallery as claimed in any one of claims 1 to 5, wherein The oil inlet of the oil inlet channel (100) is a tapered opening (101), and the aperture of the tapered opening (101) gradually decreases in a direction from an end away from the inner cooling oil cavity body (300) to an end close to the inner cooling oil cavity body (300).

7. The inner cooling oil gallery of claim 6, wherein, The oil inlet channel (100) and the oil return channel (200) are symmetrically arranged along the center line of the inner cooling oil cavity body (300); The oil inlet channel (100) corresponds to the main thrust side of the piston, and the oil return channel (200) corresponds to the auxiliary thrust side of the piston.

8. An oil-cooled piston characterized by It comprises a piston body (400) and an internal cooling oil cavity opened on the piston body (400), wherein the internal cooling oil cavity is the internal cooling oil cavity according to any one of claims 1 to 7; The oil inlet of the oil inlet channel (100) corresponds to the oil injection nozzle.

9. The oil-cooled piston of claim 8 wherein, The inner cooling oil cavity body (300) and the piston body (400) are coaxially arranged.

10. An engine characterized by, Comprising the oil-cooled piston as claimed in claim 8 or 9.

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