CN209179893U - A kind of piston crank mechanism and engine - Google Patents

Abstract

The utility model discloses a kind of piston crank mechanism and engines, and wherein piston crank mechanism includes piston；Connecting rod ASSY, connecting rod ASSY include the small end of connecting rod for matching with piston pin, the big end for matching with connecting rod bearing shell, and the connecting rod shank of connection small end of connecting rod and big end；It is provided with bushing between small end of connecting rod and piston pin, and bushing is gradually thinned with a thickness of the axial direction along bushing from center to two sides.So set, bushing can be applicable in the deformation of piston pin in the case of high detonation pressure when engine operating temperature increases, guarantee that connecting rod microcephaly is effectively cooperated with piston pin, to further ensure the operation that engine is capable of high efficient and reliable.

Description

A kind of piston connecting rod mechanism and engine

technical field

The utility model relates to the technical field of engines, in particular to a piston connecting rod mechanism and an engine.

Background technique

The piston connecting rod mechanism mainly converts the reciprocating motion of the piston into the rotational motion of the crankshaft, and at the same time converts the force acting on the piston into the output torque of the crankshaft to drive the wheels of the car. The piston connecting rod mechanism is mainly composed of piston, piston ring, piston pin, connecting rod and connecting rod bearing bush.

The connecting rod includes the small end of the connecting rod, the shaft of the connecting rod and the large end of the connecting rod. The small end of the connecting rod is connected to the piston pin through a bush. The small head and the piston pin are locked.

Therefore, how to provide a piston-connecting-rod mechanism that can effectively avoid the locking phenomenon between the piston pin and the small end of the connecting rod, so as to ensure efficient and reliable operation of the engine is a technical problem urgently needed to be solved by those skilled in the art.

Utility model content

In view of this, the purpose of the present utility model is to provide a piston connecting rod mechanism, which can effectively avoid the locking phenomenon between the piston pin and the small end of the connecting rod, thereby ensuring efficient and reliable operation of the engine.

In order to achieve the above object, the utility model provides the following technical solutions:

A piston linkage mechanism, comprising:

piston;

A connecting rod assembly, the connecting rod assembly includes a small end of the connecting rod used to cooperate with the piston pin, a large end of the connecting rod used to cooperate with the connecting rod shoe, and the small end of the connecting rod connected to the connecting rod The connecting rod shaft of the big end of the rod;

A bush is arranged between the small end of the connecting rod and the piston pin, and the thickness of the bush gradually decreases from the center to both sides along the axial direction of the bush.

Preferably, the piston includes a piston top and a piston head, the piston head includes a piston head body, and an outer ring protrusion arranged on the piston head body, and the piston head body and the piston head body The protrusion of the outer ring is an interference fit.

Preferably, the top of the piston is formed by welding.

Preferably, a plurality of internal cooling oil passages are provided on the inner wall of the piston, and the internal cooling oil passages include an oil inlet for the cooling oil to flow in and an oil outlet for the cooling oil to flow out, and The oil inlet is in the shape of a bell mouth.

Preferably, the internal cooling oil passage and the combustion chamber of the engine are profiling designed.

Preferably, the cross section of the connecting rod shaft is rectangular.

Preferably, a lubricating oil passage for lubricating the piston pin and the bushing is also provided on the body of the connecting rod.

An engine, comprising a piston-and-rod mechanism, the piston-and-rod mechanism is the piston-and-rod mechanism described in any one of the above.

It can be seen from the above technical solutions that the piston-and-rod mechanism disclosed in the utility model includes a piston; The large end of the connecting rod matched with the tile, and the connecting rod shaft connecting the small end of the connecting rod and the large end of the connecting rod; a bush is arranged between the small end of the connecting rod and the piston pin, and the thickness of the bush is along the axial direction of the bush. The direction gradually thins from the center to the sides. With such a setting, when the engine operating temperature rises, the bushing can adapt to the deformation of the piston pin under high explosion pressure, ensuring the effective cooperation between the small end of the connecting rod and the piston pin, thereby further ensuring the efficient and reliable operation of the engine.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the accompanying drawings in the following description It is only an embodiment of the utility model, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Figure 1 is a schematic diagram of the overall structure of the piston linkage mechanism disclosed in the embodiment of the present invention;

Fig. 2 is a schematic cross-sectional structure diagram of the piston disclosed in the embodiment of the present invention;

Fig. 3 is a schematic cross-sectional structure diagram of the connecting rod assembly disclosed in the embodiment of the utility model;

Fig. 4 is a schematic cross-sectional structure diagram of the connecting rod shaft disclosed in the embodiment of the present invention;

Fig. 5 is a schematic structural view of the bush disclosed in the embodiment of the utility model.

Among them, the names of the components are as follows:

1-piston, 11-piston top, 12-piston head, 121-piston body, 122-outer ring protrusion, 13-oil inlet hole, 14-oil outlet hole, 2-connecting rod assembly, 21-connecting rod Small end, 22-connecting rod big end, 23-connecting rod shaft, 3-piston pin, 4-liner, 5-internal cooling oil passage, 6-combustion chamber, 7-lubricating oil passage, 8-connecting rod bush.

Detailed ways

In view of this, the core of the present invention is to provide a piston connecting rod mechanism, which can effectively avoid the locking phenomenon between the piston pin and the small end of the connecting rod, thereby ensuring efficient and reliable operation of the engine.

In order to enable those skilled in the art to better understand the solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The piston connecting rod mechanism disclosed in the embodiment of the utility model includes a piston 1; 8 Matching connecting rod big end 22, and connecting rod shaft 23 connecting connecting rod small end 21 and connecting rod big end 22; bushing 4 is arranged between connecting rod small end 21 and piston pin 3, and bushing 4 The thickness gradually decreases from the center to both sides along the axial direction of the bushing 4 . In this way, when the engine operating temperature rises, the bushing 4 can adapt to the deformation of the piston pin under high explosion pressure, so as to ensure the effective cooperation between the small end of the connecting rod and the piston pin, thereby further ensuring the efficient and reliable operation of the engine .

As shown in Figure 2, in the piston connecting rod mechanism disclosed in the embodiment of the utility model, the piston 1 includes a piston top 11 and a piston head 12, and the piston head 12 includes a piston head body 121, and is arranged on the piston head body The outer ring protrusion 122 on 121, and the piston head body 121 and the outer ring protrusion 122 are interference fit. Such setting can further improve the overall rigidity of the piston and further prolong the service life of the piston 1 .

In order to further improve the overall rigidity of the piston 1, the piston top 11 is formed by welding, preferably by laser welding in the embodiment of the present invention.

As shown in Figure 3, in the piston linkage mechanism disclosed in the embodiment of the utility model, a plurality of internal cooling oil passages 5 are provided on the inner wall of the piston 1, and the internal cooling oil passages 5 include oil inlets for cooling oil to flow in. The port 13 and the oil outlet 14 for the cooling oil to flow out, and the oil inlet 13 is bell-shaped, so that the lubricating oil enters from the oil inlet 13, and then gathers at the oil inlet 13 and then passes through the internal cooling oil passage 5. It flows out from the oil outlet 14. Such setting can further improve the targeting efficiency and filling rate of the cooling oil, thereby ensuring the cooling effect of the piston 1.

It should be noted that the internal cooling oil passage 5 and the combustion chamber 6 disclosed in the embodiment of the utility model are designed in a profiling manner, so that the internal cooling oil passage 5 can be made larger, which is more conducive to the flow of cooling oil.

As shown in FIG. 4 , the cross section of the connecting rod shaft 23 is rectangular. With such setting, under the premise of ensuring the strength of the body, a smaller width can be obtained, thereby greatly reducing the risk of interference between connecting rods and cylinder liners, thereby further reducing the height of the whole machine and making the overall layout more compact.

Of course, the connecting rod shaft 23 is also provided with a lubricating oil passage 7 for lubricating the piston pin 3 and the bushing 4, and this lubricating oil passage 7 can lead to the connecting rod small end 21 from the lubricating oil coming out of the oil hole of the crankshaft connecting rod neck. , the bushing 4 and the piston pin 3 can be forced to lubricate, thereby avoiding the occurrence of locking failure between the small end of the connecting rod 21 and the piston pin 3, thereby further ensuring the reliable and efficient operation of the high power density diesel engine.

The embodiment of the utility model also discloses an engine, including a piston connecting rod mechanism, wherein the piston connecting rod mechanism is the piston connecting rod mechanism disclosed in any one of the above embodiments.

Since the engine adopts the piston linkage mechanism, the engine also has the technical advantages of the piston linkage mechanism disclosed in the embodiments of the present invention, and this application document will not repeat it here.

Certainly, the engine disclosed in the embodiment of the present utility model may be a gasoline engine or a diesel engine.

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

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. A piston linkage, characterized in that it comprises: piston (1); The connecting rod assembly (2), the connecting rod assembly (2) includes a connecting rod small end (21) for matching with the piston pin (3), and a connecting rod head (21) for matching with the connecting rod shoe (8) a rod big end (22), and a connecting rod shaft (23) connecting the connecting rod small end (21) and the connecting rod big end (22); A bushing (4) is arranged between the small end of the connecting rod (21) and the piston pin (3), and the thickness of the bushing (4) is along the axial direction of the bushing (4). Tapers gradually from the center to the sides. 2. The piston linkage mechanism according to claim 1, characterized in that, the piston (1) comprises a piston top (11) and a piston head (12), and the piston head (12) comprises a piston head body (121), and the outer ring protrusion (122) arranged on the piston head body (121), and the piston head body (121) and the outer ring protrusion (122) are interference Cooperate. 3. The piston connecting rod mechanism according to claim 2, characterized in that, the piston top (11) is formed by welding. 4. The piston-and-rod mechanism according to claim 1, characterized in that, the inner wall of the piston (1) is provided with a plurality of internal cooling oil passages (5), and the internal cooling oil passages (5) It includes an oil inlet (13) for cooling oil to flow in and an oil outlet (14) for the cooling oil to flow out, and the oil inlet (13) is bell-shaped. 5. The piston-and-rod mechanism according to claim 4, characterized in that, the internal cooling oil passage (5) and the engine combustion chamber (6) are contoured. 6. The piston linkage mechanism according to claim 1, characterized in that, the cross section of the connecting rod shaft (23) is rectangular. 7. The piston linkage mechanism according to claim 1, characterized in that, the connecting rod shaft (23) is also provided with a lubricating oil for lubricating the piston pin (3) and the bushing (4). Oil passage (7). 8. An engine comprising a piston-and-rod mechanism, characterized in that the piston-and-rod mechanism is the piston-and-rod mechanism according to any one of claims 1-7.