Engine piston

Abstract

The utility model relates to the technical field of engine pistons, in particular to an engine piston which comprises a piston body, the piston body comprises a top, a head and a skirt, the top, a cylinder cover and a cylinder wall jointly form a combustion chamber, and a first piston groove, a second piston groove and a third piston groove are formed in the periphery of the head. The skirt part is provided with a connecting hole for connecting a piston bolt; piston ring check blocks are arranged in the first piston groove, the second piston groove and the third piston groove and arranged in a staggered mode. A first gas ring, a second gas ring and a combined ring are respectively clamped on the first piston groove, the second piston groove and the third piston groove; the combined ring comprises a detachable ring body, an upper scraping piece, a lower scraping piece and a lining spring, wherein the upper scraping piece and the lower scraping piece are arranged on the upper side and the lower side of the ring body respectively, and the lining spring is arranged in the ring body and used for providing axial elastic force. The problem that a piston ring in a traditional engine piston is troublesome to mount and dismount is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of engine pistons, and discloses an engine piston. BACKGROUND

[0002] The engine piston is a vital component in an automobile engine, is responsible for bearing the pressure of combustion gas and converting the combustion gas into mechanical energy, pushes the crankshaft to rotate and outputs power, and completes the four basic processes of intake, compression, explosion and exhaust when the piston reciprocates in the cylinder.

[0003] Regarding the piston: by the top, the head and the skirt:

[0004] The top: the piston top and the cylinder cover and the cylinder wall jointly constitute a combustion chamber, the shape of which is related to the selected combustion chamber form, and a flat-top piston is mostly used in a gasoline engine, and various pits are often arranged on the piston top of a diesel engine piston to adapt to the formation and combustion requirements of the mixture.

[0005] The head: the piston head is provided with a piston ring, prevents high-temperature and high-pressure combustion gas from entering the crankcase, and prevents oil from entering the combustion chamber. Most of the heat absorbed by the piston top is transmitted to the cylinder through the piston head and then transmitted away through the cooling medium.

[0006] The skirt: the skirt guides the piston to reciprocate in the cylinder and bears the side pressure. Due to the action of the gas pressure in the cylinder and the influence of the temperature, the skirt will produce bending deformation and extrusion deformation.

[0007] The skirt is provided with a connecting hole for connecting a piston pin, and the piston pin is connected with the crankshaft, and the crankshaft is further pushed to rotate.

[0008] The Chinese patent with the publication number CN203420793U discloses a high-efficiency engine piston, which comprises a piston, and a gas ring groove and an oil ring groove are arranged on the piston in the radial direction, and the structural key points are as follows: at least two piston rings are arranged in the gas ring groove, the piston rings are provided with openings, the openings of the adjacent two piston rings are staggered, and piston ring stoppers corresponding to the openings of the piston rings are fixedly arranged in the gas ring groove; in the prior art, the piston head needs to be provided with the piston ring, so as to jointly constitute the combustion chamber with the cylinder cover and the cylinder wall, regarding the piston ring, the gas ring and the oil ring are usually included, and since the piston is usually a column, in order to facilitate the sleeving of the piston ring, the common piston ring is a notched piston ring, so that the sleeving of the piston ring is facilitated, therefore, the piston ring stopper is also arranged in the comparative document to cooperate with the notched piston ring, so that the piston top and the cylinder cover and the cylinder wall jointly constitute the combustion chamber and are airtight.

[0009] However, the current problem is that on the third oil ring, usually a combination ring including the upper wiper, the lower wiper and the spring provided between the upper wiper and the lower wiper, about the installation of the combination ring: the lower wiper to the spring and then to the upper wiper, and the disassembly is the same, it is relatively troublesome, therefore, in view of this, the inventor of an engine piston. Practical new type content

[0010] The utility model discloses a kind of engine pistons, which solves the problem of troublesome installation and disassembly of piston rings in traditional engine pistons.

[0011] To achieve the above object, the utility model provides the following basic scheme:

[0012] An engine piston, comprising a piston body, the piston body comprising a top portion, a head portion and a skirt portion, the top portion, a cylinder head and a cylinder wall jointly forming a combustion chamber, the head portion having a first piston groove, a second piston groove and a third piston groove formed around the head portion, and the skirt portion having a connecting hole formed thereon for connecting a piston pin;

[0013] Piston ring stops are arranged in the first piston groove, the second piston groove and the third piston groove.

[0014] A first gas ring, a second gas ring and a combination ring are respectively clamped on the first piston groove, the second piston groove and the third piston groove.

[0015] The combination ring comprises a detachable ring body, an upper wiper and a lower wiper arranged on the upper side and the lower side, and a spring arranged in the ring body for providing axial elastic force.

[0016] The principle and effect of the basic scheme are as follows:

[0017] 1. Compared with the prior art, the device has a simple structure and a clever design. Generally, the first gas ring, the second gas ring and the combination ring are provided with notches to realize the installation of the first gas ring, the second gas ring and the combination ring. However, in actual operation, it is necessary to manually move the positions of the first gas ring, the second gas ring and the combination ring so that the notch positions do not overlap, thereby improving the airtightness of the top portion, the cylinder head and the cylinder wall jointly forming the combustion chamber. However, the operation is relatively troublesome. Therefore, the device is provided with piston ring stops, which are arranged in the first piston groove, the second piston groove and the third piston groove. Based on the position of the piston ring stops, the first gas ring, the second gas ring and the combination ring are installed, without the need to manually move the positions of the first gas ring, the second gas ring and the combination ring, thereby ensuring the airtightness of the entire device.

[0018] 2. Compared with the prior art, it is well known that the core of the piston is the piston ring. Generally, the piston ring is three, the first two are gas rings, and the last one is an oil ring. Regarding the gas ring: sealing: preventing the gas in the cylinder from entering the oil pan, oil ring: scraping the excess oil on the cylinder, another improvement of the device is that the combination ring includes an upper scraper, a lower scraper, and a spring provided between the upper scraper and the lower scraper. The upper scraper and the lower scraper scrape the excess oil on the cylinder, and the spring provides the axial support force. Since it is an independent three-component, it is installed by first installing the lower scraper, then the spring, and finally the upper scraper. Similarly, it is also manually operated by first installing the upper scraper, then the spring, and finally the lower scraper. It is more troublesome. The device includes a detachable ring body, an upper scraper and a lower scraper provided on the upper side and the lower side, and a spring provided in the ring body for providing an axial spring force. The installation and disassembly of the piston ring in the traditional engine piston are more troublesome. Since it is a detachable ring body, the installation and disassembly steps are changed from three steps to one step, which is more convenient from the perspective of manual operation.

[0019] Further, the included angle of the adjacent piston ring block with the center of the piston body is 120°, and the arrangement position of the piston ring block is not on the same plane of the connecting hole. It can prevent the combustible mixture from leaking out of the opening gap of the piston ring during engine starting, thereby causing the engine to be difficult to start. The piston ring is adjusted in rotation, so that the piston ring openings are staggered at an angle of about 120°. This is also the best method for three piston ring openings.

[0020] Further, the first gas ring is a chromium-plated ring, the second gas ring is an iron-plated ring, and the first gas ring, the second gas ring, and the combination ring are provided with notches, and the size of the notches is equal to the size of the piston ring block. The effect of the piston ring block is strengthened, so that the notches of the first gas ring, the second gas ring, and the combination ring are not on the same plane of the piston hole.

[0021] Further, the first gas ring, the second gas ring, and the combination ring are provided with front face marks, and the front face marks in the combination ring are on the upper side of the ring body. Since the first gas ring, the second gas ring, and the combination ring have front faces and back faces, the front faces need to be upward according to the installation process. Therefore, the front face marks are provided to ensure that the workers do not misinstall.

[0022] Further, the ring body includes an upper ring body and a lower ring body, and the upper ring body and the lower ring body are provided with grooves. The grooves in the upper ring body and the lower ring body form a containing groove for placing the spring. The upper scraper and the lower scraper are respectively fixed to the outer sides of the upper ring body and the lower ring body.

[0023] Further, the upper ring body is provided with a plurality of connecting grooves on the same side of the groove, the lower ring body is provided with a plurality of latches corresponding to the connecting grooves in number and position on the same side of the groove, and the latches and the connecting grooves form a containing groove after combination, so that the detachable connection of the ring body is realized.

[0024] Further, the spring is not in the limit compression position after the containing groove is formed, so that the spring provides certain axial elastic force. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0026] Figure 1 A structure diagram of an engine piston is shown;

[0027] Figure 2 A structure diagram of a combined ring in an engine piston is shown. DETAILED DESCRIPTION

[0028] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects according to the present application will be described in detail below with reference to the drawings and preferred embodiments.

[0029] The reference signs in the drawings of the specification include: piston body 1, piston hole 2, third piston groove 3, second piston groove 4, first piston groove 5, piston ring stopper 6, first air ring 7, second air ring 8, combined ring 9, upper ring body 901, upper scraper 902, groove 903, spring 904, latch 905, lower ring body 906, lower scraper 907.

[0030] The embodiments are as follows: Figure 1 And Figure 2 As shown:

[0031] An engine piston comprises a piston body 1, the piston body 1 comprises a top, a head and a skirt, the top, the cylinder cover and the cylinder wall jointly form a combustion chamber, the head is provided with a first piston groove 5, a second piston groove 4 and a third piston groove 3 around, and the skirt is provided with a connecting hole for connecting a piston latch 905;

[0032] The above is the basic understanding of the existing piston body 1;

[0033] The first piston groove 5, the second piston groove 4 and the third piston groove 3 are provided with piston ring stoppers 6, and the piston ring stoppers 6 are staggered;

[0034] The first piston groove 5, the second piston groove 4 and the third piston groove 3 are provided with the first gas ring 7, the second gas ring 8 and the combined ring 9 respectively;

[0035] Regarding the piston ring stopper 6, since various rings need to be sleeved on the piston body 1 to achieve sealing, the first gas ring 7, the second gas ring 8 and the combined ring 9 need to be sleeved on the piston body 1, but the first gas ring 7, the second gas ring 8 and the combined ring 9 are an integral whole, and since the first gas ring 7, the second gas ring 8 and the combined ring 9 are not elastic materials, it is more troublesome to sleeve them, so the first gas ring 7, the second gas ring 8 and the combined ring 9 are provided with notches to facilitate the connection of the first gas ring 7, the second gas ring 8 and the combined ring 9 with the piston body 1;

[0036] Specifically: since there are sealing problems due to the notches, the positions of the three rings need to be manually adjusted every time so that the notches are not in the same plane;

[0037] This operation is more troublesome:

[0038] Therefore, the device is provided with the piston ring stopper 6, the included angles formed by the adjacent piston ring stoppers 6 with the center of the piston body 1 are all 120°, and the arrangement positions of the piston ring stoppers 6 are all not in the same plane of the connecting holes. This can prevent the combustible mixture from leaking out of the opening gaps of the piston rings during the start of the engine, thereby causing the engine to be not easy to start. The piston rings are rotated and adjusted so that the piston ring openings are staggered at an angle of about 120°, which is also the best method for the three piston ring openings.

[0039] In addition, the first gas ring 7 is a chromium-plated ring, the second gas ring 8 is an iron-plated ring, and the first gas ring 7, the second gas ring 8 and the combined ring 9 are all provided with notches, and the size of the notches is equal to the size of the piston ring stopper 6. The effect of the piston ring stopper 6 is strengthened so that the notches of the first gas ring 7, the second gas ring 8 and the combined ring 9 are not in the same plane of the piston hole 2.

[0040] After being set in this way, there is no problem of moving the position of the piston ring after the piston ring is installed using the piston ring clamp, because the piston ring stopper 6 limits the notches on the first gas ring 7, the second gas ring 8 and the combined ring 9 from being in the same plane;

[0041] The first gas ring 7, the second gas ring 8 and the combined ring 9 are all provided with front face marks, and the front face marks in the combined ring 9 are on the upper side of the ring body. Since the first gas ring 7, the second gas ring 8 and the combined ring 9 all have front faces and back faces, according to the installation process, the front faces need to face upwards, therefore, the front face marks are provided to ensure that the workers do not misinstall.

[0042] Another improvement of the device is that the oil ring, i.e. the combined ring 9, the traditional combined ring 9 includes the upper wiper 902, the lower wiper 907 and the spring 904 arranged between the upper wiper 902 and the lower wiper 907, the upper wiper 902 and the lower wiper 907 wipe off the excess oil on the cylinder, and the spring 904 provides the axial support force. Since it is an independent three-component part, it is installed in the following order: the lower wiper 907 first, the spring 904 second and the upper wiper 902 last. Similarly, it is also disassembled in the following order: the upper wiper 902 first, the spring 904 second and the lower wiper 907 last. Both the installation and disassembly are artificial operations, which are relatively troublesome.

[0043] The device improves the combined ring 9:

[0044] The combined ring 9 includes a detachable ring body, an upper wiper 902 and a lower wiper 907 arranged on the upper side and the lower side, and a spring 904 arranged in the ring body for providing an axial force.

[0045] Specifically:

[0046] The ring body includes an upper ring body 901 and a lower ring body 906, both of which are provided with a recess 903, and the recesses 903 in the upper ring body 901 and the lower ring body 906 form a containing groove for placing the spring 904, and the upper wiper 902 and the lower wiper 907 are respectively fixed to the outer side of the upper ring body 901 and the lower ring body 906.

[0047] The upper ring body 901 is provided with a plurality of connecting grooves on the same side of the recess 903, and the lower ring body 906 is provided with a plurality of insertion pins 905 corresponding in number and position to the connecting grooves on the same side of the recess 903, and the insertion pins 905 and the connecting grooves form a containing groove. The ring body can be detachably connected, and after the containing groove is formed, the spring 904 is not in the extreme compression position. The spring 904 ensures that a certain axial force is provided.

[0048] Specifically:

[0049] The installation and disassembly of the combined ring 9 in the device are simplified: the lower ring body 906 is taken out, the spring 904 is installed, the upper ring body 901 is taken out, the insertion pins 905 are installed based on the position of the connecting grooves to form a ring body, and the upper wiper 902 and the lower wiper 907 are used to ensure the function of the combined ring 9. However, when disassembling, the entire device can be disassembled, which is more convenient and easier than the traditional three-step disassembly.

[0050] Specific implementation process:

[0051] First, take out the piston body 1, then combine the combined ring 9, and then install the combined ring 9, the second gas ring 8 and the first gas ring 7 in sequence using the piston ring clamp;

[0052] Second, if it is disassembly, is the first gas ring 7, second gas ring 8 and combination ring 9 in turn disassembly can.

[0053] The device solves the problem of troublesome installation and disassembly of the piston ring in the conventional engine piston.

[0054] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the technical solution of the present application, and any equivalent embodiments with equivalent changes and modifications are still within the scope of the present application.

Claims

1. An engine piston characterized by: The piston body comprises a top, a head and a skirt, the top and the cylinder head and the cylinder wall jointly form a combustion chamber, the head is provided with a first piston groove, a second piston groove and a third piston groove around, the skirt is provided with a connecting hole for connecting a piston bolt; The first piston groove, the second piston groove and the third piston groove are provided with piston ring blocks, and the piston ring blocks are staggered arranged; The first piston groove, the second piston groove and the third piston groove are respectively provided with a first gas ring, a second gas ring and a combined ring; The combined ring comprises a detachable ring body, upper and lower scraping blades arranged on the upper side and the lower side, and a spring arranged in the ring body for providing axial elastic force.

2. An engine piston as claimed in claim 1, characterized in that The included angles of the adjacent piston ring blocks with the center of the piston body are all 120°, and the arrangement positions of the piston ring blocks are not on the same plane of the connecting hole.

3. An engine piston as claimed in claim 1, characterized in that The first gas ring is a chromium-plated ring, the second gas ring is an iron-plated ring, and the first gas ring, the second gas ring and the combined ring are all provided with notches, and the size of the notches is equal to the size of the piston ring blocks.

4. An engine piston as claimed in claim 3, wherein The first gas ring, the second gas ring and the combined ring are all provided with front face marks, and the front face mark in the combined ring is on the upper side of the ring body.

5. An engine piston according to any one of claims 1-4, characterized in that The ring body comprises an upper ring body and a lower ring body, the upper ring body and the lower ring body are both provided with grooves, the grooves in the upper ring body and the lower ring body form a containing groove, the containing groove is used for placing the spring, and the upper scraping blade and the lower scraping blade are respectively fixed to the outer sides of the upper ring body and the lower ring body.

6. An engine piston as claimed in claim 5, wherein The upper ring body is provided with a plurality of connecting grooves on the same side of the groove, the lower ring body is provided with a plurality of insertion pins corresponding to the connecting grooves in number and position on the same side of the groove, and the insertion pins and the connecting grooves form the containing groove.

7. An engine piston as claimed in claim 6, characterized in that After forming the containing groove, the spring is not at the limit compression position.

Images