CN202483742U

CN202483742U - Piston

Info

Publication number: CN202483742U
Application number: CN2012200678247U
Authority: CN
Inventors: 余锴; 郭晓瑞; 马文亮; 李慧军; 由毅; 赵福全
Original assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Geely Automobile Research Institute Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Geely Automobile Research Institute Co Ltd
Priority date: 2012-02-28
Filing date: 2012-02-28
Publication date: 2012-10-10
Anticipated expiration: 2022-02-28

Abstract

The utility model provides a piston and belongs to the field of automobile engine components and parts. The piston solves the problems of high mass, low strength and complex structure existing in existing pistons. At least two through holes are arranged on a piston skirt along a direction of a stub shaft, therefore, the piston is capable of effectively reducing the mass of the piston and the friction loss of the piston and an engine, and improving the fuel economy of the engine. Meanwhile, the position of the through holes avoids the main stress direction of a piston pin boss and the strength of the piston is guaranteed. Meanwhile, the structure is simple and reasonable.

Description

A kind of piston

Technical field

The utility model belongs to the motor car engine part field, relates to a kind of piston.

Background technique

Piston is to bear expansive force powerful after the gaseous combustion in the motor car engine and pass to connecting rod through wrist pin and order about one of vital part of crankshaft rotating.During work, piston need bear the heat load after mechanical stress alternation and the gaseous combustion, yet traditional piston mass is bigger, thereby has directly increased the load of wrist pin, connecting rod and bent axle, has also increased the frictional loss between piston and the casing wall simultaneously.

The engine piston of the many spill ports of a kind of skirt section multiple-grooved is disclosed to the problems referred to above China's utility model patents [patent ZL200620039408.0].This engine piston is that some curved annular grooves are set in the piston skirt of former pot type piston body; In some annular grooves, being provided with diameter is the spill port between the 1.0mm to 1.5mm, and this spill port is used to improve the jut that lubricates and be arranged on the piston skirt between piston and the cylinder wall.The circular groove of this device and spill port have reduced the quality of piston, also reduce the area of contact between piston and the casing wall, thereby have reduced the friction between piston and the cylinder wall.But annular groove is arranged on this piston skirt, has so just reduced the intensity of this piston along the cylinder wall direction; The force direction that mainly receives owing to piston pin boss is the vertical piston pin-and-hole axial direction of the diameter along the piston skirt simultaneously, and the spill port of this piston is arranged on the jut of piston skirt, has influenced the intensity of piston.

Summary of the invention

The purpose of the utility model is to have the problems referred to above to existing technology, has proposed a kind of piston, and described piston mass is little and can guarantee its intensity, and is simultaneously simple and reasonable for structure.

The purpose of the utility model can realize through following technical proposal: a kind of piston; What it can axially move back and forth is arranged in the cylinder; Said piston comprises piston crown, piston ring groove and piston skirt; The cross section ovalize of said piston skirt is provided with two through hole at least on the short-axis direction of upper edge, said piston skirt.

This piston is provided with two through hole at least on the piston skirt, effectively reduced the quality of piston, thereby has reduced the frictional loss between piston and the cylinder wall, has improved the fuel economy of motor.Through hole is arranged on the short-axis direction of piston skirt, and what piston pin boss had been avoided in the position of through hole mainly receives force direction, like this can be when alleviating piston mass and do not influence the intensity of piston.

In above-mentioned piston, described piston skirt is provided with the piston pin hole that runs through the piston skirt along short-axis direction.

In above-mentioned piston, the both sides that are arranged on piston pin hole of said through hole symmetry and symmetrical about the central axis of piston.Can when reducing piston mass, keep the original mass distribution of piston like this, avoid causing friction aggravation between piston part and the cylinder wall, shorten the working life of piston because of the change of mass distribution.

In above-mentioned piston, the internal diameter of said through hole is increased by nearly wrist pin nose end to wrist pin nose end far away gradually.Avoid piston pin hole intensity on every side to weaken, influenced the intensity of piston.

In above-mentioned piston, said through hole is rounded, ellipse or rectangle.Be convenient to the processing of piston, practice thrift cost.

In above-mentioned piston, all smooth connections between the inwall of said through hole.Avoid occurring between the through-hole wall that wedge angle, hole or breach cause stress raisers and the anti-fatigue ability that reduces piston.

Compared with prior art, this piston has the following advantages:

1, this piston is provided with two through hole at least on the piston skirt, has effectively reduced the quality of piston, thereby has reduced the frictional loss between piston and the cylinder wall, has improved the fuel economy of motor.

2, short-axis direction is provided with through hole along the piston skirt, and what piston pin boss had been avoided in the position of through hole mainly receives force direction, has guaranteed the intensity of piston.

Description of drawings

Fig. 1 is the partial sectional view of this piston.

Fig. 2 is the side view of this piston.

Among the figure, 10, piston crown; 20, piston ring groove; 30, piston skirt; 31, piston pin hole; 32, through hole.

Embodiment

Below be the specific embodiment of the utility model and combine accompanying drawing, the technological scheme of the utility model is done further to describe, but the utility model is not limited to these embodiments.

See also Fig. 1 and Fig. 2, a kind of piston is arranged on the interior (not shown) of cylinder and can in cylinder, axially moves back and forth, and this piston comprises piston crown 10, piston ring groove 20 and piston skirt 30.The cross section ovalize of

piston skirt

30,30 are provided with the piston pin hole 31 that runs through piston skirt 30 along short-axis direction in the piston skirt.

Said piston skirt 30 is provided with at least two through holes 32 along short-axis direction, but the quantity of through hole 32 can be four, six or eight in actual production.As preferred implementation, through hole 32 quantity of present embodiment are four.Four through holes 32 are arranged on the piston skirt 30, and what piston pin boss had been avoided in the position of through hole 32 mainly receives force direction; Like this can be when alleviating piston mass and do not influence the intensity of piston.The both sides that are arranged on piston pin hole 31 of said four through holes, 32 symmetries and symmetrical about the central axis of piston; Can when alleviating piston mass, keep the original mass distribution of piston like this, avoid causing friction aggravation between piston part and the cylinder wall, thereby shorten the working life of piston because of the change of mass distribution.Said through hole 32 is shaped as internal diameter and is increased gradually by nearly piston pin hole 31 ends to piston pin hole 31 ends far away, and all smooth connections between the inwall of through hole 32; Avoided the weakening of intensity around the piston pin hole 31, influenced the intensity of piston, avoided simultaneously occurring between through hole 32 inwalls that wedge angle, hole or breach cause stress raisers and the anti-fatigue ability that reduces piston.But in actual production, the shape of piston also can be rounded, ellipse or rectangle, is convenient to the moulding of through hole 32 like this, practices thrift cost.

In sum, 30 upper edge short-axis directions are provided with two through hole 32 at least to this piston in the piston skirt.Therefore this piston can effectively reduce the quality of piston, has reduced the frictional loss of piston and motor, has improved the fuel economy of motor; What simultaneously piston pin boss had been avoided in the position of through hole 32 mainly receives force direction, has guaranteed the intensity of piston.

Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from the spirit of the utility model or surmount the defined scope of appended claims.

Although this paper has used terms such as piston crown 10, piston ring groove 20, piston skirt 30, piston pin hole 31, through hole 32 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain the essence of the utility model more easily; It all is contrary with the utility model spirit being construed to any additional restriction to them.

Claims

1. piston; What it can axially move back and forth is arranged in the cylinder; Said piston comprises piston crown (10), piston ring groove (20) and piston skirt (30); The cross section ovalize of said piston skirt (30) is characterized in that, on the short-axis direction of upper edge, said piston skirt (30), is provided with two through hole (32) at least.

2. piston according to claim 1 is characterized in that, described piston skirt (30) are provided with the piston pin hole (31) that runs through piston skirt (30) along short-axis direction.

3. piston according to claim 2 is characterized in that, the both sides that are arranged on piston pin hole (31) of said through hole (32) symmetry and symmetrical about the central axis of piston.

4. according to claim 2 or 3 described pistons, it is characterized in that the internal diameter of said through hole (32) is increased by nearly piston pin hole (31) end to piston pin hole (31) end far away gradually.

5. according to each described piston of claim 1-3, it is characterized in that said through hole (32) is rounded, ellipse or rectangle.

6. according to each described piston among the claim 1-5, it is characterized in that all smooth connections between the inwall of said through hole (32).