CN218882371U

CN218882371U - Engine piston

Info

Publication number: CN218882371U
Application number: CN202222803337.9U
Authority: CN
Inventors: 张全洪
Original assignee: Zhongshan Shengtai Auto Parts Co ltd
Current assignee: Zhongshan Shengtai Auto Parts Co ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-04-18
Anticipated expiration: 2032-10-24

Abstract

The utility model discloses an engine piston, including the piston skirt, be provided with the piston key seat on the relative both sides of piston skirt, be provided with the pinhole that communicates with the inner chamber of piston skirt on the piston key seat, it has the copper bush to inlay in the pinhole, and the hole of copper bush is used for installing the piston pin. The utility model discloses when using, the pinhole of installation piston pin is regarded as to the hole through the copper bush, has also replaced the pinhole of piston pin seat through the hole of copper bush, because the wearability of copper bush is better, so the piston pin uses the wearing and tearing that can avoid the pinhole effectively with the hole cooperation of copper bush, promotes the life of piston.

Description

Engine piston

Technical Field

The utility model relates to an engine parts technical field especially relates to an engine piston.

Background

The piston is the core component of the engine and directly affects the performance and service life of the engine. The basic structure of the piston can be divided into a piston top, a piston head and a piston skirt. The shape of the piston top directly determines the structure of the combustion chamber and the combustion performance of the engine; the piston head is used for bearing gas pressure, preventing gas leakage and transferring heat to the cylinder wall through the piston ring; the piston skirt is used for guiding the piston to do reciprocating motion in the cylinder and bearing the side pressure of the cylinder body, piston pin bosses are arranged on two opposite side walls of the piston skirt, pin holes communicated with the inner cavity of the piston skirt are formed in the piston pin bosses, piston pins are used for installing piston pins, and the piston pins are used for enabling the connecting rods to be in driving connection with the crankshaft to drive the piston to do reciprocating motion up and down in a combustion chamber of the cylinder. However, in the existing piston structure, the two opposite ends of the piston are directly installed in the two pin holes, and because the piston drives the connecting rod through the cam, the connecting rod drives the piston to reciprocate up and down through the piston pin, so in the working process of the piston, the piston pin and the inner wall of the pin hole can generate friction, the pin hole can be seriously worn under long-term use, the aperture of the pin hole is increased, the matching use of the pin hole and the piston pin is influenced, and even the pin boss of the piston can be damaged, so that the whole piston is scrapped.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model aims to provide an engine piston, its wearing and tearing that can avoid the pinhole effectively promote the life of piston.

The purpose of the utility model is realized by adopting the following technical scheme:

the engine piston comprises a piston skirt, wherein piston pin bosses are arranged on two opposite sides of the piston skirt, pin holes communicated with an inner cavity of the piston skirt are formed in the piston pin bosses, copper bushings are embedded in the pin holes, and inner holes of the copper bushings are used for installing piston pins.

Furthermore, the edges of the two ends of the pin hole are provided with guide structures, and the guide structures are used for guiding the copper bush to be embedded into the pin hole.

Further, the piston still includes piston head and piston crown, the piston head is connected piston crown and piston skirt, be provided with a plurality of gas ring grooves along its circumference on the outer wall of piston head, be close to the piston crown the inner chamber cover of gas ring groove is equipped with wear-resisting ring, be provided with the ring channel along its circumference on the outer wall of wear-resisting ring.

Furthermore, a concave part is also arranged on the outer wall of the piston skirt.

Further, a first reinforcing part is arranged in the concave part and used for reinforcing the rigidity of the concave part.

Further, the piston crown, the piston head, and the piston skirt are integrally formed.

Furthermore, an oil ring groove is further arranged on the outer wall of the piston head and is located between the gas ring groove and the piston skirt.

Further, a second reinforcing portion for reinforcing rigidity of the piston crown is provided on an inner side of the piston crown.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses a pinhole of copper bush's hole as the installation piston pin, the pinhole that has also replaced the piston pin boss through copper bush's hole, because copper bush's wearability is better, consequently the wearing and tearing that can avoid the pinhole effectively are used in the hole cooperation of piston pin and copper bush, promote the life of piston.

Drawings

Fig. 1 is a schematic perspective view of an engine piston according to the present invention;

FIG. 2 is a schematic perspective view of the embodiment relating to the connection of the piston crown, the piston head and the piston skirt;

FIG. 3 is a schematic structural view of an embodiment relating to a wear ring;

FIG. 4 is a front view of an embodiment involving the connection of a piston crown, a piston head, and a piston skirt;

FIG. 5 isbase:Sub>A sectional view taken along line A-A.

In the figure: 10. a piston skirt; 101. a piston pin boss; 1011. a pin hole; 1012. a guide structure; 102. a recessed portion; 11. a piston head; 110. a first gas ring groove; 111. a second gas ring groove; 112. an oil ring groove; 12. a piston top; 121. a second reinforcement portion; 20. a copper bush; 30. a wear ring; 301. an annular groove.

Detailed Description

In the following, the present invention is described with priority in conjunction with the accompanying drawings and the detailed description, and it should be noted that, in the premise of no conflict, the embodiments or technical features described below may be arbitrarily combined to form a new embodiment.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top", "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, and 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 present invention.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

The implementation mode is as follows:

referring to fig. 1 to 5, the present invention shows an engine piston, which includes a piston skirt 10, piston pin bosses 101 are disposed on opposite sides of the piston skirt 10, pin holes 1011 communicating with an inner cavity of the piston skirt 10 are disposed on the piston pin bosses 101, copper bushings 20 are embedded in the pin holes 1011, and inner holes of the copper bushings 20 are used for mounting piston pins (not shown). The utility model discloses a piston is when using, and the pinhole through copper bush 20's hole as the installation piston pin, the pinhole that has also replaced piston pin seat 101 through copper bush 20's hole, because copper bush 20's wearability is better, so the piston pin uses the wearing and tearing that can avoid the pinhole effectively with copper bush 20's hole cooperation, has increased copper bush 20's hole and the wear resistance of piston pin, promotes the life of piston.

In this embodiment, the both end edges of the pin hole are provided with guide structures 1012 for guiding the insertion of the copper bush 20 into the pin hole. Specifically, the guide 1012 is a chamfered structure provided at both end edges of the pin hole.

In this embodiment, the piston further includes a piston head 11 and a piston crown 12, the piston head 11 connects the piston crown 12 and the piston skirt 10, wherein the piston crown 12, the piston head 11 and the piston skirt 10 are integrally formed, that is, the integral piston is made of forged aluminum alloy, which is convenient for processing and reduces the production cost. A plurality of air ring grooves are formed in the outer wall of the piston head 11 along the circumferential direction of the piston head; the outer wall of the piston head 11 is also provided with an oil ring groove 112, and the oil ring groove 112 is located between the gas ring groove and the piston skirt 10. As will be appreciated by those skilled in the art, an engine piston typically has three ring grooves, two gas ring grooves and one oil ring groove 112, and the gas ring is installed in the gas ring groove and mainly plays a role in sealing to prevent gas leakage in the combustion chamber; an oil ring is arranged in the oil ring groove 112 and mainly plays a role in oil scraping. That is, it can be understood that the piston is provided with a sealing effect and a lubricating effect by the gas ring groove and the oil ring groove 112.

Wherein, the gas ring groove that is closest to the piston crown 12 is first gas ring groove 110, the gas ring groove that is located between oil ring groove 112 and first gas ring groove 110 is second gas ring groove 111, because the temperature that the combustion chamber of piston crown 12 and cylinder contacted is higher, consequently, lead to the temperature of first gas ring groove 110 to be higher than the temperature of second gas ring groove 111 and oil ring groove 112, because the piston carries out reciprocating motion from top to bottom in the cylinder in the in-process of work again, and the hardness of the gas ring of installation is harder in the first gas ring groove 110, consequently the piston is in-process of work, the gas ring in first gas ring groove 110 damages this first gas ring groove 110 easily, thereby lead to the wearing and tearing of first gas ring groove 110 comparatively serious. In contrast, the wear-resistant ring 30 is sleeved in the first annular groove 110, and the wear-resistant ring 30 protects the first annular groove 110 from being worn. Specifically, the wear-resistant ring 30 is made of a nickel-iron material, a top end surface of the wear-resistant ring 30 is attached to a top end surface in the first gas ring groove 110, and a lower end surface of the wear-resistant ring 30 is attached to a bottom end surface in the first gas ring groove 110. Of course, the annular groove 301 is provided on the outer wall of the wear-resistant ring 30 along the circumferential direction thereof, and the annular groove 301 is used for installing the gas ring, that is, the annular groove 301 on the wear-resistant ring 30 replaces the first gas ring groove 110 for installing the gas ring, so that the wear resistance of the annular groove 301 can be effectively improved, and the first gas ring groove 110 is protected from wear.

In this embodiment, the outer wall of the piston skirt 10 is further provided with a recessed portion 102, the recessed portion 102 reduces the contact surface between the piston skirt 10 and the cylinder, so as to reduce friction between the piston and the cylinder body, and also reduce the consumable material of the product, reduce the weight of the product, and save the cost. Further, the recess portion 102 is provided with a first reinforcing portion (not shown) by which the rigidity of the recess portion is reinforced. In addition, the second reinforcement portion 121 is provided on the inner side of the piston crown 12, and the rigidity of the piston crown 12 is reinforced by the second reinforcement portion 121, thereby preventing the piston crown 12 from being cracked during operation.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. The engine piston comprises a piston skirt (10), wherein piston pin bosses (101) are arranged on two opposite sides of the piston skirt (10), pin holes (1011) communicated with an inner cavity of the piston skirt (10) are formed in the piston pin bosses (101), and the engine piston is characterized in that copper bushings (20) are embedded in the pin holes (1011), and inner holes of the copper bushings (20) are used for installing piston pins.

2. The engine piston of claim 1, characterized in that, the piston further comprises a piston head (11) and a piston top (12), the piston head (11) connects the piston top (12) and the piston skirt (10), a plurality of gas ring grooves are arranged on the outer wall of the piston head (11) along the circumferential direction, a wear-resistant ring (30) is sleeved on the inner cavity of the gas ring groove close to the piston top (12), and an annular groove (301) is arranged on the outer wall of the wear-resistant ring (30) along the circumferential direction.

3. An engine piston according to claim 1, characterized in that the edges of the two ends of the pin hole (1011) are provided with guiding structures (1012) for guiding the copper bush (20) to be inserted into the pin hole (1011).

4. An engine piston according to claim 1, characterized in that the outer wall of the piston skirt (10) is further provided with a recess (102).

5. An engine piston according to claim 4, characterized in that a first reinforcement is provided in the recess (102), said first reinforcement being adapted to reinforce the rigidity of the recess (102).

6. An engine piston according to claim 2, characterized in that the piston crown (12), the piston head (11) and the piston skirt (10) are formed in one piece.

7. An engine piston according to claim 2, characterized in that the outer wall of the piston head (11) is further provided with an oil ring groove (112), and the oil ring groove (112) is located between the gas ring groove and the piston skirt (10).

8. An engine piston according to claim 2, characterized in that the inner side of the piston crown (12) is provided with a second reinforcement (121) for reinforcing the rigidity of the piston crown (12).