CN218717156U - Piston and engine - Google Patents

Abstract

The utility model belongs to the automobile field especially relates to a piston and engine. The piston includes a piston head and a piston skirt. The piston skirt extends inwards from the axial inner end of the piston head along the axial direction, and a piston pin seat used for installing a pin shaft is arranged on the peripheral wall of the piston skirt; the piston head and the piston skirt enclose to form a piston cavity with an opening at the bottom, and a reinforcing rib structure is arranged on the inner wall of the piston cavity. In the piston provided by the embodiment, the reinforcing rib structure is arranged on the inner wall of the piston cavity of the piston, so that the wall thickness of the piston can be further reduced on the premise of ensuring the structural strength and rigidity of the piston, and the aim of light weight design is fulfilled.

Description

Piston and engine

Technical Field

The utility model belongs to the automobile field especially relates to a piston and engine.

Background

The piston of automobile engine is one of the main fittings in the engine, and it forms a piston group together with piston ring, piston pin, etc. and forms a combustion chamber together with cylinder cover, etc. to bear the gas acting force and transmit the power to the crankshaft through piston pin and connecting rod, so as to complete the working process of internal combustion engine.

When the vehicle normally runs, fuel is combusted in the cylinder to push the piston to reciprocate, and partial energy generated by fuel combustion is converted into kinetic energy required by the piston. It can be understood that piston weight is one of the main factors influencing the kinetic energy required by the piston and the inertial resistance of the piston, and the reduction of piston weight is of great significance to improve the performance of the engine. At present, the piston is mainly in two types of light weight, namely material optimization and structure optimization, and the main mode of the current structure optimization is to arrange a groove on the piston to achieve the purpose of weight reduction, but the piston is limited by limited structural space, and the effect of weight reduction through the groove is limited.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem provided by the prior art, the utility model provides a piston and engine, this piston is equipped with strengthening rib structure, through the wall thickness of attenuate piston in order to reach the lightweight purpose.

The utility model discloses a first aspect provides a piston, and this piston includes:

a piston head; and

the piston skirt extends inwards from the axial inner end of the piston head along the axial direction, and a piston pin seat used for installing a pin shaft is arranged on the peripheral wall of the piston skirt;

the piston head and the piston skirt enclose to form a piston cavity with an opening at the bottom, and a reinforcing rib structure is arranged on the inner wall of the piston cavity.

Optionally, the reinforcing rib structure is a mesh structure formed by a plurality of intersecting ribs.

Optionally, a plurality of ribs are distributed over the inner wall of the piston cavity.

Optionally, the piston is provided with a weight-reducing structure, and the weight-reducing structure comprises a plurality of weight-reducing inner grooves symmetrically arranged on two radial sides of the piston pin seat.

Optionally, the weight-reducing internal recess includes an oil return port disposed on an axially inner end edge of the piston head.

Optionally, the circumferential wall of the piston head is provided with a plurality of piston ring grooves arranged in parallel and at intervals along the axial direction, and the oil return port is communicated with the piston ring groove at the innermost end in the axial direction.

Optionally, the weight-reducing inner recess comprises a first recess provided at an axially inner end of the piston head, the first recess communicating with the oil return port.

Optionally, the weight-reducing inner grooves comprise second grooves disposed on the outside of the side walls of the piston pin boss.

Optionally, the weight-reducing inner recess further comprises a third recess disposed at an axially inner end of the piston head, the third recess being disposed adjacent the second recess.

A second aspect of the present invention provides an engine comprising a piston as described above.

The present invention provides a piston head for a piston, which is used for sealing to prevent blow-by, and a skirt portion of the piston serves to guide and bear lateral pressure. Particularly, the inner wall of the piston cavity of the piston is provided with the reinforcing rib structure, so that the wall thickness of the piston can be further reduced on the premise of ensuring the structural strength and rigidity of the piston, and the purpose of reducing weight is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a cross-sectional view of a piston provided in accordance with one embodiment of the present invention;

fig. 2 is a cross-sectional view of a piston provided in accordance with another embodiment of the present invention;

fig. 3 is a schematic view of a piston provided in accordance with one embodiment of the present invention;

fig. 4 is a schematic view of a piston provided in accordance with another embodiment of the present invention;

FIG. 5 is a front view of the piston of FIG. 3;

FIG. 6 is a cross-sectional view of the piston of FIG. 4 at A;

fig. 7 is a cross-sectional view of the piston of fig. 4 at B.

Reference numerals

10. A piston head; 11. a piston ring groove; 12. an oil return port; 13. a first groove; 14. a third groove;

20. a piston skirt; 21. a piston pin boss; 211. a second groove; 212. a piston pin bore;

30. a piston cavity; 31. and (4) ribs.

Detailed Description

In order to make the above and other features and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings. It is understood that the specific embodiments described herein are for purposes of illustration only and are not intended to be limiting.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship 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 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.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As mentioned above, the prior art has a technical solution of providing a recess on a piston structure to reduce weight, but because the space of the piston is limited, the effect of reducing weight can be achieved by the technical solution. In view of this, the utility model aims at providing a novel piston, be equipped with the strengthening rib structure on the internal perisporium of this piston chamber 30, under the effect of strengthening rib structure, can further reduce the wall thickness of this piston, reduce weight when guaranteeing the structural strength and the rigidity of this piston so, reach the lightweight purpose.

Fig. 1 is a cross-sectional view of a piston provided in accordance with one embodiment of the present invention. Fig. 2 is a cross-sectional view of a piston provided in accordance with another embodiment of the present invention. As shown in fig. 1 to 2, a first aspect of the present invention provides a piston including a piston head 10 and a piston skirt 20. The piston skirt 20 extends axially inwardly from the axially inner end of the piston head 10 and is provided on the peripheral wall with a piston pin seat 21 for mounting a pin shaft. The piston head 10 and the piston skirt 20 are enclosed to form a piston cavity 30 with an opening at the bottom, and a reinforcing rib structure is arranged on the inner wall of the piston cavity 30.

Specifically, the piston operates under severe conditions of high temperature, high pressure, altitude, poor lubrication, etc., in which the piston head 10 serves to prevent high temperature, high pressure gas from being blown into the crankcase, and piston rings are generally coaxially mounted on the piston head 10 to prevent the blow-by. The piston skirt 20 guides the piston to reciprocate in the cylinder and receives the side pressure generated by the inner wall of the cylinder, the piston pin seat 21 is further provided on the peripheral wall of the piston skirt 20, and the piston pin seat 21 is provided with a piston pin hole 212. It can be understood that the piston head 10 and the piston skirt 20 enclose a piston cavity 30, a crankshaft connecting rod connected with the crankshaft can extend into the piston cavity 30 through a bottom opening of the piston cavity 30, and a piston pin penetrates through the piston pin hole 212 to realize the pivotal connection of the piston and the connecting rod. In particular, in the present embodiment, the inner wall of the piston cavity 30 is provided with a rib structure, so that the wall thickness of the piston can be further reduced on the premise of ensuring the structural strength and rigidity of the piston, thereby achieving the purpose of reducing weight.

Further, the rib structure is a net structure composed of a plurality of intersecting ribs 31. In other words, the circumferential wall of the piston chamber 30 is provided with a plurality of ribs 31, and the ribs 31 are crossed with each other to form the rib structure. In the embodiment shown in fig. 1, the plurality of ribs 31 are arranged only on the axially inner end wall of the piston head 10. In the embodiment shown in fig. 2, the plurality of ribs 31 are disposed only on the inner circumferential wall of the piston skirt 20. It can be seen that the arrangement position of the ribs 31 can be adjusted as required. Of course, the wall thickness of the piston can be reduced, and the density of the net structure formed by the ribs 31 can be adjusted to ensure the structural strength and rigidity.

Preferably, a plurality of ribs 31 are distributed over the inner wall of the piston chamber 30. In other words, the ribs 31 are distributed over the axial inner end wall of the piston head 10 and the inner peripheral wall of the piston skirt 20, so that the whole piston has good structural strength and rigidity, and good bearing capacity of the piston is guaranteed. In this embodiment, because the inner wall of the piston cavity 30 is full of ribs, the wall thickness of the piston can be reduced by even about 20%, and the weight reduction effect is obvious.

Fig. 3 is a schematic view of a piston provided according to one embodiment of the present invention. Fig. 4 is a schematic view of a piston provided according to another embodiment of the present invention. As shown in fig. 3 and 4, in the embodiment of the present invention, the piston is provided with a weight reduction structure, and the weight reduction structure includes a plurality of weight reduction inner grooves symmetrically arranged on both sides of the piston pin boss 21 in the radial direction.

In particular, in the embodiment, the piston is provided with the reinforcing rib structure, and the weight reduction inner groove is arranged to achieve the purpose of further reducing weight. Of course, the weight-reducing inner grooves may reduce the structural strength and rigidity of the piston, but the adverse effects caused by the weight-reducing inner grooves can be reduced by adjusting the reinforcing rib structure (such as the density degree of the net-shaped structural ribs 31) so as to ensure that the structural strength and rigidity of the piston are qualified.

In the embodiment shown in fig. 3 and 4, the piston skirt 20 has a kidney-like radial cross-section, and the piston pin bosses 21 are radially disposed to project from the straight wall sections of the piston skirt 20. Naturally, the weight-reducing inner grooves are symmetrically arranged on the two radial sides of the piston pin seat 21, so that the gravity center of the piston is ensured to be positioned at the axial lead of the piston, and eccentric wear is not easy to generate in the reciprocating movement process of the piston in the cylinder.

As shown in fig. 3 and 5, further, the weight-reduced inner recess includes oil return ports 12 provided on an axially inner end edge of the piston head 10. It should be noted that the oil return port 12 does not extend through the entire piston head 10 in order to avoid blow-by, and the oil return port 12 can, of course, serve to reduce the weight of the piston.

As mentioned earlier, the piston head 10 is coaxially mounted with piston rings to prevent blow-by, and accordingly, the circumferential wall of the piston head 10 is provided with a plurality of piston ring grooves 11 arranged in parallel at intervals in the axial direction, the piston ring grooves 11 being used for mounting piston rings, one of the main functions of which is to prevent blow-by. Wherein, the oil return port 12 is communicated with the piston ring groove 11 positioned at the innermost end in the axial direction.

Specifically, the combustion chamber is a high-temperature and high-pressure environment, a large amount of lubricating oil cannot exist in the combustion chamber, the piston ring located at the innermost end in the axial direction is an oil ring at present, the oil ring can scrape the lubricating oil on the inner wall of the combustion chamber, the lubricating oil further flows out of the oil return opening 12 to a crankcase, and the oil return opening 12 not only plays a role in reducing weight, but also plays a role in an oil return opening.

Fig. 6 is a cross-sectional view of the piston of fig. 4 at a. Fig. 7 is a cross-sectional view of the piston of fig. 4 at B. In the embodiment shown in fig. 6 and 7, the number of the piston ring grooves 11 is 3, the axially innermost piston ring groove 11 is used for mounting an oil ring, and the other two piston ring grooves 11 are used for mounting an air ring, and mainly play a role in preventing blow-by. The number of the piston ring grooves 11 and the order of the piston ring mounting are not limited to the illustrated embodiment.

Since the oil return opening 12 is located at the edge of the piston head 10, the size of the oil return opening 12 should not be too large in order to ensure sealability, and thus the weight reduction through the oil return opening 12 is limited. In order to further reduce the weight of the piston, the piston lightening inner grooves include a first groove 13 provided at the axially inner end of the piston head 10, the first groove 13 communicating with the oil return port 12.

In the present embodiment, the first groove 13 is provided at the axially inner end of the piston head 10 to further reduce the weight of the piston, and in order to achieve a greater weight reduction effect, the opening of the first groove 13 is larger in size, and even communicates with the oil return port 12 without interfering with the piston pin boss 21 as much as possible. In the embodiment shown in fig. 4, the shape of the first groove 13 is triangle-like, the number of the first grooves 13 and the number of the oil return openings 12 are four, and two first grooves 13 and two oil return openings 12 on one radial side of the piston skirt 20 are symmetrically arranged on two sides of the piston pin boss 21. Of course, the shape of the first groove 13 is not limited to the illustrated embodiment, and may be adjusted according to the installation space of the piston.

In an embodiment of the present invention, to further reduce the weight of the piston, the weight-reducing inner recess includes a second recess 211 provided on the outer side of the side wall of the piston pin boss 21. Further, the weight-reduced inner recess further includes a third recess 14 provided at the axially inner end of the piston head 10, the third recess 14 being provided adjacent to the second recess 211. Specifically, due to the avoidance of the second groove 211, a third groove 14 can be machined at the axially inner end of the piston head 10 to further reduce the weight of the piston.

As shown in fig. 4, the third groove 14 is an elliptical groove, and the shape of the third groove 14 is not limited thereto, and may be, for example, any one of a circular groove, a kidney-shaped groove, and a polygonal groove. As shown in fig. 3 to 5, in the illustrated embodiment, the weight-reducing inner grooves substantially fill the area between the axially inner end of the piston head 10 and the piston skirt 20, and are symmetrically arranged on both radial sides of the pin boss 21, ensuring balance of the piston.

In an embodiment of the invention, the piston is provided as an integral part, preferably as an aluminum casting. It should be noted that in the embodiment shown in fig. 3 and 4, the piston skirt 20 is provided with a fillet transition near the peripheral walls of the first groove 13 and the second groove 211, and the transition is natural, so that the piston is not easy to crack.

To sum up, in the piston provided by the utility model, be equipped with the strengthening rib structure on the inner wall of piston chamber 30, guaranteed the structural strength and the prerequisite of rigidity of this piston, can reduce the wall thickness of this piston to reach lightweight purpose, further, set up on this piston and subtract heavy inner groovy (set up oil return opening and grooving) in order to reach further weight reduction purpose.

In a second aspect the invention provides an engine comprising a piston as described above. Since the engine includes the above-described piston, it is obvious that all the effects by the above-described piston are obtained, and a description thereof will not be repeated.

It is of course understood that the engine also comprises other components interacting with the piston or independent of the piston, such as parts of the cylinder head, crankcase, crankshaft connecting rod, crankshaft, etc., which are not described in detail herein, since they do not relate to the main inventive concept of the present invention.

Further, it should be understood by those skilled in the art that all or some of the sub-modules involved in the product provided by the embodiments of the present invention may be combined or replaced by fusion, simple change, mutual transformation, etc., such as the placement and moving positions of the components; or the products formed by the components are integrally arranged; or a detachable design; any combined component can be combined into a device/apparatus/system with a specific function, and the device/apparatus/system is used to replace the corresponding component of the present invention, which also falls into the protection scope of the present invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A piston, comprising:

a piston head (10); and

a piston skirt (20) which extends inwards from the axial inner end of the piston head (10) along the axial direction and is provided with a piston pin seat (21) for mounting a pin shaft on the peripheral wall;

the piston comprises a piston head (10) and a piston skirt portion (20), wherein the piston head and the piston skirt portion enclose to form a piston cavity (30) with an opening at the bottom, and a reinforcing rib structure is arranged on the inner wall of the piston cavity (30).

2. Piston according to claim 1, characterized in that the rib structure is a net structure of a plurality of intersecting ribs (31).

3. Piston according to claim 2, characterized in that a plurality of said ribs (31) are distributed over the inner wall of said piston chamber (30).

4. Piston according to claim 1, characterized in that it is provided with weight-reducing structures comprising a plurality of weight-reducing inner grooves arranged symmetrically on both radial sides of the pin boss (21).

5. Piston according to claim 4, characterized in that said weight-reduced internal recess comprises an oil return opening (12) provided on an axially inner end edge of said piston head (10).

6. The piston according to claim 5, characterized in that the peripheral wall of the piston head (10) is provided with a plurality of piston ring grooves (11) arranged axially in parallel at intervals, and the oil return port (12) communicates with the piston ring groove (11) located at the axially innermost end.

7. Piston according to claim 5, characterized in that said weight-reducing internal recess comprises a first recess (13) provided at an axially inner end of said piston head (10), said first recess (13) communicating with said oil return port (12).

8. Piston according to claim 4, characterized in that the weight-reduced inner recess comprises a second recess (211) provided on the outside of the side wall of the piston pin boss (21).

9. The piston of claim 8, wherein said weight-reduced internal recess further comprises a third recess (14) disposed at an axially inner end of said piston head (10), said third recess (14) being disposed adjacent said second recess (211).

10. An engine, characterized in that it comprises a piston according to any one of claims 1 to 9.

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