CN207960788U - A kind of piston - Google Patents

Abstract

The utility model discloses a piston, which comprises the outer top of the piston, the outer skirt of the piston and the inner pin seat of the piston. The outer pin hole of the piston is arranged on the outer skirt of the piston, and the inner pin hole corresponding to the position of the outer pin hole is arranged on the inner pin seat of the piston. The top is set on the top of the outer skirt of the piston, and the top and side parts of the inner pin seat of the piston are provided with vertical support rings and horizontal support ring ribs. The inner pin seat of the piston is set on the inner cavity of the outer top of the piston and the outer skirt of the piston. The vertical supporting ring is connected with the bottom surface of the inner chamber of the outer top of the piston, and the horizontal supporting ring rib on the inner pin seat of the piston is connected with the side surface of the inner chamber of the outer top of the piston. The piston has the advantages of simple structure, easy manufacture and molding, weight reduction and high strength.

Description

a piston

technical field

The utility model mainly relates to the technical field of internal combustion engines, in particular to a piston.

Background technique

Piston engine technology is advancing with each passing day. Improving engine combustion and explosion pressure has become the most important direction, and the requirements for engine pistons are also increasing. Steel pistons have thus become an important choice for engine technology improvement. However, all-steel pistons are heavy and increase the number of The weight of the rod group also increases the requirements for related parts of the engine, especially the two-stroke engine has a lower manufacturing cost of the four-stroke piston engine. Under the same volume, the volume is small and the power per liter is higher, but the heat load of the piston is higher. Large, there are higher requirements for the heat load capacity and weight of the piston.

In order to meet the requirement of continuously increasing heat load on the piston head, the material of the piston head is basically selected from heat-resistant alloy steel. Steel) skirt structure, double oil chamber all steel structure, double oil chamber steel top aluminum (iron, steel) skirt combination structure, double oil chamber articulated bolt connection structure, etc. There are many patented structures and manufacturing methods in the piston structure industry. Such as: CN201220646167.1 double-cooling oil cavity welded integral forged steel internal combustion engine piston, revealing the forming and manufacturing method of double oil cavity all-steel structure piston, CN200920317459.9 a diesel engine articulated piston, which provides a dual oil cavity articulated piston structure and manufacturing method.

Steel structure pistons can adapt to the requirements of engines with different mechanical loads and thermal loads, but the steel structure pistons in the prior art have the following main shortcomings in the process of manufacture and use, such as: heavy weight of the piston, high manufacturing cost, difficulty in blank forming, The high temperature of the pin seat is likely to cause the piston pin to lock, the welding flash particles to remain, and the process to be complicated.

For example: single oil chamber integral cast steel (iron) structure, heavy piston weight, limited heat dissipation effect of cooling oil passage, high temperature of pin seat will cause high temperature locking failure of piston pin; single oil chamber integral forged steel structure, piston blank forging is difficult Large, heavy piston, difficult to form the cooling oil passage, high temperature of the pin seat will cause high temperature locking failure of the piston pin; single oil chamber hinged steel top aluminum (iron, steel) skirt structure, its mechanical load can withstand compared with the overall The structure should be small, especially the heat transfer path of the articulated pin seat is limited, and the problem of high temperature locking failure of the piston pin caused by the high temperature of the pin seat is difficult to solve, so that the articulated piston is gradually eliminated under the background of engine emission upgrade and engine explosion pressure. The forged steel welded structure piston with double oil cavity is difficult to form, the piston is heavy, and the welding flash particles remain in the cooling oil channel; the process of the double oil cavity steel top aluminum (iron, steel) skirt combination structure piston is complicated and the manufacturing cost is high , The weight of the piston is relatively large; the hinged piston with double oil chambers connected by bolts is made of steel piston head and aluminum alloy skirt, and the piston head is connected by steel top and cast iron pin seat with bolts. The hinged piston structure Complex, bulky, heavy piston weight, lack of reliability.

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a piston with simple structure, easy manufacture and molding, weight reduction and high strength.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A piston, comprising an outer top of the piston, an outer skirt of the piston and an inner pin seat of the piston, the outer skirt of the piston is provided with an outer pin hole, the inner pin seat of the piston is provided with an inner pin hole corresponding to the position of the outer pin hole, the piston The outer top is arranged on the top of the outer skirt of the piston, the top and side parts of the inner pin seat of the piston are provided with vertical support rings and lateral support ring ribs, and the inner pin seat of the piston is arranged on the inner cavity of the outer top of the piston and the outer skirt of the piston, The vertical support ring on the piston inner pin seat is connected with the bottom surface of the piston outer top inner chamber, and the horizontal support ring rib on the piston inner pin seat is connected with the side surface of the piston outer top inner cavity.

As a further improvement of the above technical solution:

An annular oil chamber and a central oil chamber communicating with each other are formed between the outer top of the piston, the vertical support ring and the transverse support ring rib, and the central oil chamber and the annular oil chamber are located on the inner and outer sides of the vertical support ring. The vertical support ring is arranged as an inverted trumpet-shaped structure with a large top and a small bottom.

The vertical support ring is threadedly connected with the bottom surface of the inner cavity of the outer top of the piston.

The transverse support ring rib is welded to the side of the inner cavity of the outer top of the piston.

The annular oil chamber is provided with an oil inlet hole and an oil outlet hole respectively located on both sides of the inner pin hole, and the inner pin seat of the piston is provided with a central oil hole connecting the central oil chamber and the inner cavity of the inner pin seat of the piston.

The inner pin seat of the piston is also provided with a pin seat oil hole communicating with the central oil chamber and the inner pin hole.

The vertical support ring is provided with a communication oil hole connecting the central oil chamber and the annular oil chamber.

Oil escape holes located on both sides of the inner pin hole are also opened on the annular oil chamber.

An elastic sealing ring is arranged between the outer top of the piston and the outer skirt of the piston.

The outer top of the piston and the inner pin seat of the piston are made of steel, and the outer skirt of the piston is made of aluminum.

Compared with the prior art, the utility model has the advantages of:

The piston of the utility model comprises the outer top of the piston, the outer skirt of the piston and the inner pin seat of the piston, the outer pin hole of the piston is provided on the outer skirt of the piston, the inner pin hole corresponding to the position of the outer pin hole is arranged on the inner pin seat of the piston, and the outer top of the piston is arranged on The top of the outer skirt of the piston, the top and side parts of the inner pin seat of the piston are provided with vertical support rings and horizontal support ring ribs, the inner pin seat of the piston is arranged in the inner cavity of the outer top of the piston and the outer skirt of the piston, and the vertical support on the inner pin seat of the piston The ring is connected with the bottom surface of the inner cavity of the outer top of the piston, and the transverse support ring rib on the inner pin seat of the piston is connected with the side surface of the inner cavity of the outer top of the piston. Compared with the traditional structure, the piston adopts a three-piece combined structure, which is convenient for structural strengthening according to the design requirements. The structure is simple. While reducing the difficulty of blank forming, it is important to reduce the weight of the piston, which is conducive to reducing the movement load; The support ring can transmit the combustion pressure to the inner pin seat of the piston, which improves the strength; the horizontal support ring rib forms an external connection with the outer top of the piston, and the inner and outer two connecting structures fully ensure that the outer top of the piston and the inner pin seat of the piston are in the ring. The connection part is in effective steel contact; the outer top of the piston is connected with the inner pin seat of the piston to form the piston head, and the piston head and the outer skirt of the piston are hingedly connected by the piston pin, which is reliable in connection and eliminates the high temperature of the inner pin seat of the piston, which is beneficial to the piston head. The structure is simplified, the difficulty of the manufacturing process is reduced, and the manufacturing cost is saved.

Description of drawings

Fig. 1 is a schematic diagram of a partial cross-sectional structure in the main direction of the present invention.

Fig. 2 is a side sectional structural schematic diagram of the utility model.

Fig. 3 is a schematic cross-sectional structure schematic diagram of the main direction of the outer top of the piston in the utility model.

Fig. 4 is a schematic cross-sectional structure schematic diagram of the main direction of the inner pin seat of the piston in the utility model.

Fig. 5 is a schematic diagram of a lateral partial cross-sectional structure of the inner pin seat of the piston in the utility model.

Fig. 6 is a schematic cross-sectional structure schematic diagram of the outer skirt of the piston in the utility model in the main direction.

Each label in the figure means:

1. Piston outer top; 2. Piston outer skirt; 21. Outer pin hole; 3. Piston inner pin seat; 31. Inner pin hole; 32. Vertical support ring; 321. Connecting oil hole; 33. Horizontal support ring rib; 34 , center oil hole; 35, pin seat oil hole; 4, annular oil cavity; 41, oil inlet hole; 42, oil outlet hole; 43, escape oil hole; 5, center oil cavity; 6, elastic sealing ring.

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 to Fig. 6 have shown a kind of embodiment of piston of the present invention, comprise piston outer top 1, piston outer skirt 2 and piston inner pin seat 3, be provided with outer pin hole 21 on the piston outer skirt 2, piston inner pin seat 3 is provided with an inner pin hole 31 corresponding to the position of the outer pin hole 21, the outer top of the piston 1 is set on the top of the outer skirt 2 of the piston, and the top and side parts of the inner pin seat 3 of the piston are provided with a vertical support ring 32 and a lateral support ring rib 33, Piston inner pin seat 3 is arranged in the inner cavity of piston outer top 1 and piston outer skirt 2, the vertical support ring 32 on piston inner pin seat 3 is connected with the bottom surface of piston outer top 1 inner cavity, and the lateral support on piston inner pin seat 3 The ring rib 33 is connected with the side of the inner cavity of the piston outer top 1 . Compared with the traditional structure, the piston adopts a three-piece combined structure, which is convenient for structural strengthening according to the design requirements. The structure is simple. While reducing the difficulty of blank forming, it is important to reduce the weight of the piston, which is conducive to reducing the movement load; The support ring 32 can transmit the combustion pressure to the inner pin seat 3 of the piston, which improves the strength; the lateral support ring rib 33 forms an external connection with the outer top 1 of the piston, and the inner and outer two connecting structures fully ensure that the outer top 1 of the piston is connected to the piston. The piston inner pin seat 3 is in effective steel contact at the annular joint; the piston outer top 1 and the piston inner pin seat 3 are connected to form the piston head, and the piston head and the piston outer skirt 2 are hingedly connected by the piston pin, which is reliable and eliminates the piston inner pin The high temperature of the seat is beneficial to simplify the structure of the piston head, reduce the difficulty of the manufacturing process, and save the manufacturing cost.

In this embodiment, an annular oil chamber 4 and a central oil chamber 5 communicating with each other are formed between the outer top of the piston 1 and the vertical support ring 32 and the transverse support ring rib 33, and the central oil chamber 5 and the annular oil chamber 4 are located on the vertical support. On the inner and outer sides of the ring 32, the vertical support ring 32 is arranged in an inverted trumpet-like structure with a large top and a small bottom. The piston adopts a double oil chamber structure, which increases the heat dissipation area and effectively reduces the heat load on the top of the piston; the vertical support ring 32 communicates with the annular oil chamber 4 and the central oil chamber 5, which is conducive to the flow of lubricating oil, reduces weight and reduces heat from Transmission from the outer top of the piston 1 to the inner pin seat 3 of the piston; the explosive pressure of the outer top 1 of the piston can be transmitted to the inner pin seat 3 of the piston; the small head of the vertical support ring 32 leans against the inner pin seat 3 of the piston to transmit the gas pressure of the head; The large head of the vertical support ring 32 is in rigid contact with the outer top 1 of the live piston to bear the top pressure. Especially for a piston with a double oil chamber structure with insufficient structural volume (limited height) of the piston head, the small head structure of the vertical support ring 32 can enlarge the volume of the annular oil chamber.

In this embodiment, the vertical support ring 32 is threadedly connected with the bottom surface of the inner cavity of the outer top 1 of the piston. The vertical support ring 32 and the piston outer top 1 form an internal connection, that is, the vertical support ring 32 and the piston outer top 1 are connected by threads (or brazing), which is simple and reliable.

In this embodiment, the lateral support ring rib 33 is welded to the side of the inner cavity of the piston outer top 1 . Welding connection is used here, on the one hand, the horizontal connection is beneficial to welding positioning, and on the other hand, welding is a fixed connection, which further improves the stability.

In this embodiment, the annular oil chamber 4 is provided with an oil inlet hole 41 and an oil outlet hole 42 respectively located on both sides of the inner pin hole 31, and the inner pin seat 3 of the piston is opened with a hole connecting the central oil chamber 5 and the inner cavity of the inner pin seat 3 of the piston. Center oil hole 34. The change of the combined oil outlet mode formed by the oil inlet hole 41, the oil outlet hole 42 and the central oil hole 34 ensures that the inner pin seat 3 of the piston, the outer pin hole 21 and the inner pin hole 31 are fully cooled, and the heat load on the inner pin seat 3 of the piston is reduced , Eliminate the high-temperature locking problem of the outer pin hole 21 and the inner pin hole 31.

In this embodiment, the inner pin seat 3 of the piston is also provided with a pin seat oil hole 35 communicating with the central oil chamber 5 and the inner pin hole 31 . The pin seat oil hole 35 is conducive to the flow of lubricating oil, reduces weight and reduces the heat transfer from the outer top 1 of the piston to the inner pin seat 3 of the piston. The change of the combined oil discharge method formed by 35 ensures that the inner pin seat 3 of the piston, the outer pin hole 21 and the inner pin hole 31 are fully cooled, reduces the thermal load on the inner pin seat 3 of the piston, and eliminates the problem of high temperature locking of the outer pin hole 21 and the inner pin hole 31 .

In this embodiment, the vertical supporting ring 32 is provided with a communicating oil hole 321 communicating with the central oil chamber 5 and the annular oil chamber 4 . In this structure, the vertical support ring 32 can transmit the combustion pressure to the piston inner pin seat 3, and the structure of the vertical support ring 32 and the communicating oil hole 341 is conducive to the flow of lubricating oil, reducing weight and reducing heat from the outer top of the piston to the piston. Passing of the inner pin seat 3.

In this embodiment, the annular oil chamber 4 is also provided with oil escape holes 43 located on both sides of the inner pin hole 31 . The setting of the oil escape hole 43 further ensures that the inner pin seat 3 of the piston, the outer pin hole 21 and the inner pin hole 31 are fully cooled, reduces the thermal load on the inner pin seat 3 of the piston, and eliminates the problem of high temperature locking of the outer pin hole 21 and the inner pin hole 31.

In this embodiment, an elastic sealing ring 6 is provided between the piston outer top 1 and the piston outer skirt 2 . Piston outer skirt 2 and piston outer top 1 adjacent end processing installs the semi-circular groove of high temperature resistant O-shaped elastic sealing ring 6, guarantees that lubricating oil does not inhale the intake and exhaust ports of the external cylinder liner.

In this embodiment, the piston outer top 1 and the piston inner pin seat 3 are made of steel, and the piston outer skirt 2 is made of aluminum. This arrangement has a simple structure, and while reducing the difficulty of blank forming, it is important to reduce the weight of the piston, which is beneficial to the reduction of the motion load.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present utility model, can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the utility model, or modify it into an equivalent change, etc. effective example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. A piston, characterized in that it includes the outer top of the piston (1), the outer skirt of the piston (2) and the inner pin seat (3) of the piston, and the outer pin hole (21) is arranged on the outer skirt of the piston (2) , the piston inner pin seat (3) is provided with an inner pin hole (31) corresponding to the position of the outer pin hole (21), the outer top of the piston (1) is set on the top of the outer skirt (2) of the piston, and the inner pin of the piston The top and side parts of the seat (3) are provided with a vertical support ring (32) and a transverse support ring rib (33), and the piston inner pin seat (3) is arranged on the outer top of the piston (1) and the outer skirt of the piston (2) The inner cavity of the piston inner pin seat (3) is connected with the vertical support ring (32) on the bottom surface of the piston outer top (1) inner cavity, and the horizontal support ring rib (33) on the piston inner pin seat (3) is connected with the piston outer Top (1) side connection to lumen. 2. The piston according to claim 1, characterized in that an annular oil chamber (4) communicating with each other is formed between the outer top of the piston (1) and the vertical support ring (32) and the transverse support ring rib (33). ) and the central oil chamber (5), the central oil chamber (5) and the annular oil chamber (4) are located on the inner and outer sides of the vertical support ring (32), and the vertical support ring (32) is set to be upward Large and small inverted trumpet-shaped structure. 3. The piston according to claim 2, characterized in that: the vertical support ring (32) is threadedly connected with the bottom surface of the inner cavity of the piston outer top (1). 4. The piston according to claim 3, characterized in that: the lateral support ring rib (33) is welded to the side of the inner cavity of the outer crown (1) of the piston. 5. The piston according to any one of claims 2 to 4, characterized in that: the annular oil chamber (4) is provided with oil inlet holes (41) and An oil outlet hole (42), and a central oil hole (34) connecting the central oil chamber (5) and the inner cavity of the piston inner pin seat (3) is provided on the piston inner pin seat (3). 6 . The piston according to claim 5 , characterized in that: the inner pin seat ( 3 ) of the piston is further provided with a pin seat oil hole ( 35 ) connecting the central oil chamber ( 5 ) and the inner pin hole ( 31 ). 7. The piston according to claim 6, characterized in that: the vertical support ring (32) is provided with a communication oil hole (321) connecting the central oil chamber (5) and the annular oil chamber (4). 8. The piston according to claim 7, characterized in that: the annular oil chamber (4) is also provided with oil escape holes (43) located on both sides of the inner pin hole (31). 9. The piston according to any one of claims 1 to 4, characterized in that an elastic sealing ring (6) is provided between the piston outer top (1) and the piston outer skirt (2). 10. The piston according to any one of claims 1 to 4, characterized in that: the outer top of the piston (1) and the inner pin seat (3) of the piston are made of steel, and the outer skirt of the piston (2 ) is set to Aluminum material.