CN215057786U - Steel piston for internal combustion engine - Google Patents
Steel piston for internal combustion engine Download PDFInfo
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- CN215057786U CN215057786U CN202120928186.2U CN202120928186U CN215057786U CN 215057786 U CN215057786 U CN 215057786U CN 202120928186 U CN202120928186 U CN 202120928186U CN 215057786 U CN215057786 U CN 215057786U
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Abstract
The utility model discloses an internal-combustion engine steel piston, including the piston body, the piston body includes piston head, piston skirt be equipped with interior cold oil duct between piston head and the piston skirt, correspond both sides at piston skirt position and be equipped with piston oil inlet, piston oil-out respectively, still include the oil feed drainage tube, the oil feed drainage tube assembles the oil inlet position, and the interior cold oil duct inlet port outside is equipped with the hydraulic fluid port that gathers that the outside opening is big, the inboard opening is little, gathers the hydraulic fluid port and communicates with each other with interior cold oil duct inlet port. The utility model discloses can strengthen the cooling efficiency of cold oil duct in the forged steel piston, reduce piston temperature, reduce oxidation and the coking to cooling machine oil simultaneously, improve the reliability of piston.
Description
Technical Field
The utility model relates to an internal-combustion engine technical field especially relates to an internal-combustion engine steel piston.
Background
With the improvement of the strengthening index of the engine, the power density and the explosion pressure of the engine are higher and higher, and the piston bears higher thermal load and mechanical load. To meet the performance requirements of high load engines, steel pistons are becoming the mainstream design today. Although the forged steel piston has high strength, the temperature of the head is high due to low heat conductivity, and the temperature of the piston is reduced by adopting a large inner cooling oil channel and oscillating engine oil.
The forged steel piston in the prior art only has one inner cooling oil duct and a cylindrical oil inlet hole which are formed by welding a piston head and a skirt, and cooling oil enters the inner cooling oil duct from a piston oil inlet, takes away heat of the piston in a vibration mode and flows out from a piston oil outlet.
The inner cooling oil duct of the large-cylinder-diameter steel piston is designed into a large-volume inner cooling oil duct, the engine rotating speed is relatively low, the coverage rate of the cooling oil in the inner cooling oil chamber is relatively low, the cooling efficiency of the cooling oil to a high-temperature area is relatively low, for a gas engine, a combustion chamber is relatively deep, a fire point is relatively lower, the inner cooling oil duct with a flat and long cross section is generally adopted, and the cooling efficiency of the inner side wall surface and the outer side wall surface of the inner cooling oil duct is relatively low, therefore, the temperature of the piston is increased in different degrees, the inner cooling oil duct is seriously coked, the ageing of engine oil is accelerated, and the risk of piston failure is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a steel piston for an internal combustion engine. The utility model discloses can strengthen the cooling efficiency of cold oil duct in the forged steel piston, reduce piston temperature, reduce oxidation and the coking to cooling machine oil simultaneously, improve the reliability of piston.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the steel piston comprises a piston body, wherein the piston body comprises a piston head and a piston skirt, an inner cooling oil duct is arranged between the piston head and the piston skirt, a piston oil inlet and a piston oil outlet are respectively arranged on two corresponding sides of the piston skirt, the steel piston further comprises an oil inlet drainage tube, the oil inlet drainage tube is assembled to the oil inlet, an oil gathering port with a large outer opening and a small inner opening is arranged on the outer side of an oil inlet hole of the inner cooling oil duct, and the oil gathering port is communicated with the oil inlet hole of the inner cooling oil duct.
The oil inlet is processed with a clamping groove near the inner side, and the end of the drainage tube is provided with a drainage tube lower side clamping jaw matched with the clamping groove.
The upper side surface of the drainage tube is higher than the lower side surface of the internal cooling oil duct.
The lower side surface of the drainage tube is provided with a drainage tube lower side notch, so that the circumferential rigidity is reduced, and the drainage tube is convenient to install and fix at the position of a piston oil inlet.
The inner diameter of the drainage tube is not less than the diameter of the piston oil inlet hole.
And a drainage tube mounting hole matched with the oil inlet drainage tube is formed in the position where the oil inlet is communicated with the inner cooling oil duct, and the drainage tube mounting hole is assembled with the oil inlet drainage tube after reaming treatment.
The oil gathering port is in a horn mouth shape or a conical shape.
An inner cooling oil duct spacer is arranged in the inner cooling oil duct, the inner cooling oil duct is divided into an upper inner cooling oil duct and a lower inner cooling oil duct through the inner cooling oil duct spacer, a piston inner cooling oil duct inner side positioning step and a piston inner cooling oil duct outer side positioning step for fixing the inner cooling oil duct spacer are respectively arranged on the inner cooling oil duct, and the inner side and the outer side of the inner cooling oil duct spacer are respectively matched with the piston inner cooling oil duct inner side positioning step and the piston inner cooling oil duct outer side positioning step.
Interior cold oil duct spacer includes the spacer body, corresponds both sides and is equipped with the spacer oil-out respectively on the spacer body, is equipped with spacer outside location step, spacer inboard location step on the spacer body respectively, still is equipped with the drainage tube on the spacer body, and on the inboard location step face of inner cold oil duct was assembled to spacer inboard location step face, the assembly of inner cold oil duct outside location step and spacer outside location step face.
The piston head and the piston skirt are welded into an integral structure.
The invention has the beneficial effects that:
1. the utility model discloses a steel piston is equipped with the drainage tube in the oil feed hole position, plays the effect of carrying and preventing the refluence to the machine oil that gets into in the cold oil duct, according to interior cold oil duct shape demand, is equipped with interior cold oil duct spacer cooperation drainage tube and uses, two-layer interior cold oil duct about making interior cold oil duct form, has promoted the rate of coverage of cold oil duct efficiency and increase machine oil to interior cold oil duct wall in the coolant oil gets into, has promoted the cooling efficiency of interior cold oil duct to the piston.
2. And a first drainage tube mounting hole matched with the oil inlet drainage tube is formed in the position where the oil inlet is communicated with the inner cooling oil duct, and the first drainage tube mounting hole is assembled with the oil inlet drainage tube after being subjected to reaming treatment. Preventing circumferential rotation of the drainage tube.
3. The spacer oil outlet is respectively arranged on two corresponding sides of the spacer body, the spacer outer side positioning step and the spacer inner side positioning step are respectively arranged on the spacer body, a drainage tube mounting hole II used for connecting an oil inlet drainage tube is further formed in the spacer body, the spacer inner side positioning step surface is assembled on the inner side positioning step surface of the inner cooling oil duct, the inner cooling oil duct outer side positioning step and the spacer outer side positioning step surface are assembled, and fixing of the inner cooling oil duct spacer can be reliably realized.
4. A clamping groove is processed at the position, close to the inner side, of the oil inlet hole, and a clamping jaw matched with the clamping groove is arranged at the end part of the drainage tube. The drainage tube is firmly installed and fixed at the position of the oil inlet of the inner cooling oil duct.
5. Because the side of the drainage tube is higher than the lower side surface of the inner cooling oil duct, the backflow prevention effect of engine oil can be achieved, the engine oil can vibrate in the inner cooling oil duct, heat in the piston can be taken away, and the engine oil can flow out through the oil outlet of the piston, so that the cooling effect is improved.
6. Through be in the drainage tube downside is equipped with drainage tube downside breach, makes it reduce circumference rigidity, installs more easily.
7. The inner diameter of the drainage pipe is not smaller than the diameter of the oil inlet hole of the piston, and cooling oil can enter the inner cooling oil duct more smoothly.
Drawings
FIG. 1 is a schematic sectional view of an assembled inner cooling oil duct spacer and a steel piston body.
FIG. 2 is a schematic structural view of a steel piston body according to the present invention.
FIG. 3 is a schematic diagram of the inner cooling gallery spacer structure of the present invention.
FIG. 4 is a sectional view of the inner cooling gallery spacer structure of the present invention.
FIG. 5 is a sectional view of the inner cooling gallery spacer structure of the present invention.
FIG. 6 is a schematic cross-sectional view of the assembled inner cooling gallery spacer and steel piston body of the present invention.
FIG. 7 is a schematic structural view of a steel piston body according to the present invention.
FIG. 8 is a schematic view of the inner cooling gallery spacer structure of the present invention.
Fig. 9 is a sectional view showing the structure of the inner cooling gallery partition according to the present invention.
Fig. 10 is a sectional view showing the structure of the inner cooling gallery partition according to the present invention.
FIG. 11 is a schematic view of the draft tube and steel piston assembly.
Description of reference numerals:
1-a piston body, 11-a piston head, 12-a piston skirt, 13-an oil inlet, 14-an oil outlet, 15-an upper-layer inner cooling oil duct, 16-a lower-layer inner cooling oil duct, 17-an oil gathering bell mouth, 18-a piston inner cooling oil duct inner side positioning step and 19-a piston inner cooling oil duct outer side positioning step;
2-inner cooling oil duct spacer, 21-oil inlet drainage tube, 22-spacer oil outlet, 23-spacer, 24-spacer outer side positioning step and 25-spacer inner side positioning step;
3-a piston body, 31-a piston head, 32-a piston skirt, 33-an oil inlet, 34-an oil outlet, 35-an upper-layer inner cooling oil channel, 36-a lower-layer inner cooling oil channel, 37-an oil gathering bell mouth, 38-a piston inner cooling oil channel inner side positioning step and 39-a piston inner cooling oil channel outer side positioning step;
4-inner cooling oil duct spacer, 41-oil inlet drainage tube, 42-spacer oil outlet, 43-spacer, 44-spacer outer side positioning step and 45-spacer inner side positioning step;
51-piston head, 52-piston skirt, 53-lower side surface of inner cooling oil channel, 54-oil inlet hole of inner cooling oil channel, 55-oil gathering bell mouth, 56-clamping groove and 57-inner cooling oil channel;
6-drainage tube, 61-inner hole of drainage tube, 62-wall of drainage tube, 63-lower notch of drainage tube, 64-lower jaw of drainage tube and 65-upper side surface of drainage tube.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments.
Example 1
A steel piston of an internal combustion engine comprises a piston head 51 and a piston skirt 52, wherein the piston head 51 and the piston skirt 52 are integrated in a welding mode, a closed circumferential inner cooling oil channel 57 is formed inside the piston head 51 and the piston skirt 52, the inner cooling oil channel 57 is communicated with an oil inlet hole 54 of the inner cooling oil channel, and a bell-mouth-shaped or cone-hole-shaped oil gathering port 55 with a large outer opening and a small inner opening is arranged outside the oil inlet hole 54 of the inner cooling oil channel. The oil collecting port 55 is communicated with the oil inlet hole 54 of the inner cooling oil passage. Before welding the piston body, firstly, the internal cooling oil chamber part at the head part of the piston and the internal cooling oil passage part at the skirt part of the piston are respectively processed, and an oil inlet 54 of the internal cooling oil passage at the skirt part of the piston is processed.
A clamping groove 56 is machined at the position, close to the inner side, of the oil inlet hole 54 of the inner cooling oil channel, a drainage tube lower side clamping claw 64 matched with the clamping groove 56 is arranged at the end part of the drainage tube, and the drainage tube is assembled and fixed to the position of the oil inlet hole of the piston through the matching of the clamping groove 56 and the drainage tube lower side clamping claw 64. The drainage tube lower side claw 64 is fixed at the position of the piston oil inlet hole clamping groove 56 by punching deformation, and finally the piston head 51 and the skirt 52 are welded into a whole.
The working principle of the drainage tube is that in the operation process of the piston, cooling engine oil enters the drainage tube 6 through the oil gathering bell mouth 55 and the oil inlet 54 of the inner cooling oil duct, and then enters the inner cooling oil duct 57 through the inner hole 61 of the drainage tube.
The upper side surface 65 of the draft tube is higher than the lower side surface 53 of the internal cooling oil passage. The upper side surface 65 of the drainage tube is higher than the lower side surface 53 of the inner cooling oil duct, so that the backflow prevention effect of engine oil can be achieved, the engine oil can vibrate in the inner cooling oil duct and take away heat in the piston, and the engine oil can flow out through the oil outlet of the piston, so that the cooling effect is improved.
The lower side surface of the drainage tube is provided with a drainage tube lower side notch 63, so that the circumferential rigidity of the position is reduced, the clamping jaw 64 is easier to bend and deform, and the drainage tube 2 is convenient to install and fix at the position of the piston oil inlet.
The inner diameter of the drainage tube 6 is not less than the diameter of the oil inlet of the piston, the thickness of the drainage tube wall 62 is adjusted according to the diameter of the cylinder of the piston and is generally 0.5mm-2mm, the lower side of the drainage tube is provided with a claw, the number of gaps at the lower side of the drainage tube is determined according to the thickness of the drainage tube wall 62, and the thicker the drainage tube is, the larger the number of the gaps can be properly increased.
The structure of the embodiment 1 is characterized in that the cavity of the inner cooling oil duct is small, and the drainage tube is assembled and fixed at the position of the oil inlet hole of the piston, namely, the drainage tube of the inner cooling oil duct only has the function of preventing cooling oil which enters the inner cooling oil duct from flowing back from the position of the oil inlet of the piston.
Certainly, according to the shape requirement of the inner cooling oil duct, an inner cooling oil duct spacer is arranged to be matched with the drainage tube for use, so that the inner cooling oil duct forms an upper inner cooling oil duct and a lower inner cooling oil duct, the efficiency of cooling oil entering the inner cooling oil duct is improved, the coverage rate of engine oil on the wall surface of the inner cooling oil duct is increased, and the cooling efficiency of the inner cooling oil duct on the piston is improved.
Example 2
An internal combustion engine steel piston with an oil inlet drainage structure and an inner cooling oil duct partition is shown in figures 1-5, and the inner cooling oil duct is a flat and long inner cooling oil duct steel piston. The piston comprises a piston body 1 and an inner cooling oil channel spacer 2, wherein the piston body 1 comprises a piston head 11 and a piston skirt 12, and the piston head 11 and the piston skirt 12 are welded into an integral structure; an inner cooling oil duct 16 is arranged between the piston head 11 and the piston skirt 12, a piston oil inlet 13 and a piston oil outlet 14 are respectively arranged on two corresponding sides of the piston skirt 12, an oil inlet drainage tube 21 is assembled at the position of the oil inlet 13, the inner cooling oil duct 16 is divided into an upper inner cooling oil duct 15 and a lower inner cooling oil duct 16 through an inner cooling oil duct partition 2, an inner piston cooling oil duct inner side positioning step 18 and an outer piston cooling oil duct outer side positioning step 19 for fixing the inner cooling oil duct partition 2 are respectively arranged on the inner cooling oil duct 16, and the inner side and the outer side of the inner cooling oil duct partition 2 are respectively matched with the inner piston cooling oil duct inner side positioning step 18 and the outer piston cooling oil duct outer side positioning step 19.
And a drainage tube mounting hole matched with the oil inlet drainage tube 21 is formed in the position where the piston oil inlet 13 is communicated with the inner cooling oil duct, and the drainage tube mounting hole is subjected to reaming treatment and is used for being assembled with the oil inlet drainage tube 21.
Interior cold oil duct spacer 2 includes spacer body 23, corresponds both sides and is equipped with spacer oil-out 22 respectively on the spacer body 23, is equipped with spacer outside location step 24, spacer inboard location step 25 on the spacer body 23 respectively, still is equipped with the drainage tube 21 that is used for connecting the oil inlet on the spacer body 23, and drainage tube 21 upside exceeds spacer body 23, and on the inboard location step 25 face of spacer assembled the inboard location step 18 face of interior cold oil duct, the assembly of the 24 face of the outside location step 19 and spacer outside location step of interior cold oil duct.
The inner cooling oil passage partition 2 is installed before the piston 11 and the piston skirt 12 are welded. Before welding, an upper-layer inner cooling oil duct 15, a lower-layer inner cooling oil duct 16, an inner side positioning step 18 of the inner cooling oil duct of the piston, an outer side positioning step 19 of the inner cooling oil duct of the piston, a piston oil inlet 13 and a piston oil outlet 14 are processed. After the machining is finished, firstly, the inner cooling oil channel partition 2 is assembled on the piston skirt 12, the surface of the inner side positioning step 25 of the partition is assembled on the surface of the inner side positioning step 18 of the inner cooling oil channel, the oil inlet drainage tube 21 is assembled at the position of the oil inlet 13, the piston head 11 and the piston skirt 12 are assembled, the outer side positioning step 19 of the inner cooling oil channel is assembled with the surface of the outer side positioning step 24 of the partition, and the piston head 11 and the piston skirt 12 are welded after the assembly is finished.
Example 3
An internal combustion engine steel piston with an oil inlet drainage and an internal cooling oil passage partition is shown in figures 6-10, and the internal cooling oil passage is a large-cavity internal cooling oil passage steel piston. The piston comprises a piston body 3 and an inner cooling oil channel spacer 4, wherein the piston body 3 comprises a piston head 31 and a piston skirt 32, and the piston head 31 and the piston skirt 32 are welded into an integral structure; an inner cooling oil duct 16 is arranged between the piston head 31 and the piston skirt 32, a piston oil inlet 33 and a piston oil outlet 34 are respectively arranged on two corresponding sides of the piston skirt 32, an oil inlet drainage tube 41 is assembled at the position of the oil inlet 33, the inner cooling oil duct 36 is divided into an upper inner cooling oil duct 35 and a lower inner cooling oil duct 36 through an inner cooling oil duct partition 4, an inner side positioning step 38 of the inner cooling oil duct of the piston and an outer side positioning step 39 of the inner cooling oil duct of the piston for fixing the inner cooling oil duct partition 4 are respectively arranged on the inner cooling oil duct 36, and the inner side and the outer side of the inner cooling oil duct partition 4 are respectively matched with the inner side positioning step 38 of the inner cooling oil duct of the piston and the outer side positioning step 39 of the inner cooling oil duct of the piston.
And a drainage tube mounting hole matched with the oil inlet drainage tube 41 is formed in the position where the piston oil inlet 33 is communicated with the inner cooling oil channel, and the drainage tube mounting hole is subjected to reaming treatment and is used for being assembled with the oil inlet drainage tube 41.
Interior cold oil duct spacer 4 includes spacer body 43, corresponds both sides and is equipped with spacer oil-out 42 respectively on spacer body 43, is equipped with spacer outside location step 44, spacer inboard location step 45 on spacer body 43 respectively, still is equipped with the drainage tube 41 that is used for connecting the oil inlet on spacer body 43, and on the inboard location step 38 face of interior cold oil duct was assembled to spacer inboard location step 45 face, interior cold oil duct outside location step 39 and spacer outside location step 44 face assembly.
The inner-cooling gallery partition 4 is installed before the piston 31 and the piston skirt 32 are welded. Before welding, the upper-layer inner cooling oil duct 35, the lower-layer inner cooling oil duct 36, the inner side positioning step 38 of the inner cooling oil duct of the piston, the outer side positioning step 39 of the inner cooling oil duct of the piston, the piston oil inlet 33 and the piston oil outlet 34 are processed. After the machining is finished, firstly, the inner cooling oil channel partition 4 is assembled on the piston skirt 32, the surface of the inner side positioning step 45 of the partition is assembled on the surface of the inner side positioning step 38 of the inner cooling oil channel, the oil inlet drainage tube 41 is assembled at the position of the oil inlet 33, the piston head 31 and the piston skirt 32 are assembled, wherein the surface of the outer side positioning step 39 of the inner cooling oil channel is assembled with the surface of the outer side positioning step 44 of the partition, and the piston head 31 and the piston skirt 32 are welded after the assembly is finished.
In the embodiment 2 and the embodiment 3, fig. 1 and fig. 6 are two pistons with different structures, and the piston is characterized in that the inner cooling oil passage in the steel piston in fig. 1 is flat and long, the cavity of the steel piston in fig. 6 is larger, and the inner cooling oil passage is larger, and an inner cooling oil passage spacer and a drainage tube are added on the basis of the existing inner cooling oil passage in the steel piston, the inner cooling oil passage spacer and the drainage tube can be integrated and assembled on the piston, wherein the inner cooling oil passage spacer plays a role of dividing the inner cooling oil passage to form an upper inner cooling oil passage and a lower inner cooling oil passage, so that when the inner cooling oil oscillates in the inner cooling oil passage, the upper inner cooling oil passage and the lower inner cooling oil passage are synchronously cooled, the coverage rate of the cooling oil on the wall surface of the inner cooling oil passage is improved, the cooling efficiency of the inner cooling oil passage is improved, and the drainage tube plays a role of conveying the cooling oil passage to the upper inner cooling oil passage of the piston and preventing the cooling oil from flowing back.
The utility model discloses a basic structure shape and rationale, it uses in piston head and skirt welded forming's steel piston, this use still can other various changes and improvement, contain and withhold the interior cold oil duct spacer of welding mode assembly through drain tube structure and piston head and piston skirt, the shape of spacer can be adjusted according to interior cold oil duct cooling demand, the interior cold oil duct of piston head and piston skirt is used for assembling the position of spacer, do not confine to step face and groove, the mounted position is adjusted according to piston structure and welding seam position. The scope of protection of the present invention is defined by the structural form, the assembly form and the operation principle thereof.
The inner cooling oil duct spacer and the drainage tube are arranged, the overall structure shape of the inner cooling oil duct spacer is determined according to the overall structure of a piston and the shape of the inner cooling oil duct, the cross section of the inner cooling oil duct spacer is generally large circular arc, the spacer can be of a whole-circle single-piece type or a half-piece combined type, the drainage tube is provided with the cooling oil drainage tube, the inner diameter of the drainage tube is not smaller than the diameter of an oil inlet of the piston, the position of an oil outlet on the spacer is determined according to the position of an oil outlet of the piston, the deflection angle between the oil outlet on the spacer and the oil outlet of the piston is larger than 30 degrees, and the number of the oil outlets on the spacer is determined according to the oil inlet amount.
Inner cooling oil duct spacers can be properly added on the flat and long inner cooling oil duct and the large cavity inner cooling oil duct to separate the inner cooling oil duct from the middle to form an upper inner cooling oil duct and a lower inner cooling oil duct, so that the drainage tube conveys cooling oil to a high-temperature region of the piston, the working principle is that cooling engine oil is efficiently conveyed to an upper-layer inner cooling oil channel of the piston from an oil inlet of the piston through a drainage tube, and the drainage tube is higher than the ground of the upper layer internal cooling oil channel to prevent the backflow of cooling oil, and simultaneously the cooling oil firstly cools the top surface of the piston and the high-temperature area of the throat part of the combustion chamber, and finally, the cooling oil flows out from the oil outlet of the lower-layer internal cooling oil duct of the piston, so that the upper layer and the lower layer of the internal cooling oil duct are synchronously cooled, the coverage rate of the cooling oil on the internal cooling oil duct is realized, and the cooling effect on the piston is greatly improved.
In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the present invention, but do not require the present invention to be constructed or operated in a specific orientation, and therefore, cannot be construed as limiting the present invention. The terms "connected" and "connected" in the present invention are to be understood in a broad sense, and may be connected or detachably connected, for example; the terms may be directly connected or indirectly connected through intermediate components, and specific meanings of the terms may be understood as specific conditions by those skilled in the art.
The foregoing is a preferred embodiment of the present invention, and the description of the specific embodiments is only for better understanding of the idea of the present invention. To those skilled in the art, many modifications and equivalents may be made in accordance with the principles of the present invention and are deemed to fall within the scope of the invention.
Claims (10)
1. The steel piston of the internal combustion engine comprises a piston body, wherein the piston body comprises a piston head and a piston skirt, an inner cooling oil duct is arranged between the piston head and the piston skirt, a piston oil inlet and a piston oil outlet are respectively arranged on two corresponding sides of the piston skirt, and the steel piston is characterized by further comprising an oil inlet drainage tube, the oil inlet drainage tube is assembled to the oil inlet, an oil gathering port with a large outer opening and a small inner opening is arranged on the outer side of an oil inlet hole of the inner cooling oil duct, and the oil gathering port is communicated with the oil inlet hole of the inner cooling oil duct.
2. The steel piston of internal combustion engine as claimed in claim, wherein a slot is formed near the inner side of the oil inlet, and a jaw at the lower side of the drainage tube is arranged at the end of the drainage tube and is matched with the slot.
3. The internal combustion engine steel piston of claim 1, wherein the upper side of the draft tube is higher than the lower side of the internal cooling oil gallery.
4. The internal combustion engine steel piston of claim 1, wherein the draft tube underside is provided with a draft tube underside notch.
5. The internal combustion engine steel piston of claim 1, wherein the inner diameter of the draft tube is not less than the diameter of the piston inlet hole.
6. The internal combustion engine steel piston of claim 1, wherein a drainage tube mounting hole matched with the oil inlet drainage tube is formed at a position where the oil inlet is communicated with the inner cooling oil passage, and the drainage tube mounting hole is assembled with the oil inlet drainage tube after being subjected to reaming treatment.
7. The internal combustion engine steel piston of claim 1, wherein the oil gathering port is flared or conical.
8. The internal combustion engine steel piston as set forth in claim 1, wherein the inner cooling oil passage is provided with an inner cooling oil passage partition which is divided into an upper inner cooling oil passage and a lower inner cooling oil passage by the inner cooling oil passage partition, the inner cooling oil passage is provided with an inner positioning step for fixing the inner cooling oil passage partition, the outer cooling oil passage is provided with an outer positioning step for fixing the inner cooling oil passage partition, and the inner side and the outer side of the inner cooling oil passage partition are respectively matched with the inner positioning step for the inner cooling oil passage of the piston and the outer positioning step for the inner cooling oil passage of the piston.
9. The internal combustion engine steel piston of claim 8, wherein the inner cooling gallery spacer includes a spacer body having spacer oil outlets on respective sides thereof, spacer outer and inner positioning steps on the spacer body, and a drain tube on the spacer body, the spacer inner positioning step being fitted to the inner cooling gallery inner positioning step, the inner cooling gallery outer positioning step being fitted to the spacer outer positioning step.
10. The internal combustion engine steel piston of claim 1, wherein the piston head and the piston skirt are welded together as a unitary structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120928186.2U CN215057786U (en) | 2021-04-30 | 2021-04-30 | Steel piston for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120928186.2U CN215057786U (en) | 2021-04-30 | 2021-04-30 | Steel piston for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215057786U true CN215057786U (en) | 2021-12-07 |
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ID=79108182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120928186.2U Active CN215057786U (en) | 2021-04-30 | 2021-04-30 | Steel piston for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215057786U (en) |
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2021
- 2021-04-30 CN CN202120928186.2U patent/CN215057786U/en active Active
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