CN202431386U

CN202431386U - Diesel engine piston

Info

Publication number: CN202431386U
Application number: CN2011204897075U
Authority: CN
Inventors: 杨英; 展靖华; 张五金
Original assignee: CNR Dalian Locomotive Research Institute Co Ltd
Current assignee: CRRC Dalian Institute Co Ltd; Dalian CRRC Zetong Machinery Co Ltd
Priority date: 2011-11-30
Filing date: 2011-11-30
Publication date: 2012-09-12
Anticipated expiration: 2021-11-30

Abstract

The utility model discloses a diesel engine piston, which comprises a piston head and a piston skirt, wherein the piston head and the piston skirt are mutually connected and are connected through a screw bolt, the piston head is a steel piston head, the piston skirt is made of nodular cast iron, the outer circle diameter of the piston is 340mm, the center height of the piston is 240 to 280mm and is preferably 262.5mm, and the fire shore height of the piston is 50 to 90mm and is preferably 62mm. The diesel engine piston can bear the highest bursting pressure reaching 20MPa, the bursting pressure improvement requirement of a diesel engine is met, and in addition, the integral structure of the piston is more compact.

Description

Diesel engine piston

Technical field

The utility model relates to the piston technical field, relates in particular to a kind of diesel engine piston

Background technique

In the prior art; Diesel engine piston whole spheroidal graphite cast iron piston or the dual-gripper steel toe iron skirt combined pistons of using more; Along with the reinforcement degree of diesel engine is increasingly high; Particularly diesel engine high strengthen, when pressure of explosion reaches 20MPa, strength deficiency, distortion went beyond the limit when above-mentioned piston used, and can not satisfy the requirement that pressure of explosion reaches the high-power highly-intensified diesel engine of 20MPa.

The model utility content

The technical problem that the utility model solved provides a kind of diesel engine piston that bears explosive force up to 20MPa.

The technological scheme that the utility model adopts is that diesel engine piston comprises interconnective piston head and piston skirt; Piston head is connected through bolt with piston skirt; Said piston head is the steel piston head, and piston skirt is processed by spheroidal graphite cast iron, and the outside diameter of piston is 340mm; The centre height is 240-280mm, and the firepower bank height of piston is 50-90mm.

The piston head bottom is provided with at least two tapped blind holes; Corresponding position, piston skirt top is provided with through hole; Be connected through stud bolt between piston head and the piston skirt, an end of stud bolt screws in the blind hole on the piston head, and the other end passes through hole and through nut check.

The quantity of bolt and through hole, blind hole is at least 4 groups, and becomes rectangle or square symmetry to arrange along piston axis; On the same horizontal plane, piston has two orthogonal axis of symmetry, is first to cross centerline hole with adjacent two through hole circle center line connectings, and first crosses centerline hole and apart 60mm-75mm parallel with axis of symmetry wherein; With first to cross two perpendicular through hole circle center line connectings of centerline hole be second to cross centerline hole, second to cross centerline hole parallel with another axis of symmetry, apart 75mm-60mm.

The bottom of piston head is distributed with the cooling blind hole, and the quantity of cooling blind hole is 25-30, and the diameter of cooling blind hole is 20mm-25mm, and the angle of cooling blind hole axis and piston vertical axis is 15 °-25 °.

The beneficial effect of the utility model piston is; The utility model piston is through steel piston head and spheroidal graphite cast iron piston skirt bolt; And cooperate accurate piston head combustion-chamber shape, distinctive cooling chamber, piston ring groove layout, bolt position to arrange; Make this model utility diesel engine piston on piston basis in the past, mechanical property and structural all is improved, and has satisfied on piston basis in the past the requirement that improves pressure of explosion; This practical novel piston technological scheme maximum explosive pressure can reach 20MPa, and the piston overall structure is compact more.

Description of drawings

Fig. 1 is the sectional view of the diesel engine piston of the utility model along axis

Fig. 2 is the plan view of the diesel engine piston of the utility model

Fig. 3 is the worm's eye view of piston head of the diesel engine piston of the utility model

Be labeled as among the figure: 1-nut, 2-elastic sleeve, 3-piston skirt, 4-bolt; Cold house in the 5-piston head, 6-piston head, 7-piston vertical axis; The outer cold house's cooling of 8-blind hole, 9-piston skirt top oilhole, the 10-first piston axis of symmetry; The 11-second piston axis of symmetry, 12-first crosses centerline hole, and 13-second crosses centerline hole.

Embodiment

The diesel engine piston of the utility model is mainly used in high-powered medium-speed diesel engines, and the compression ratio of this novel diesel machine piston is between 12: 1～15: 1, and stroke is 420～480mm.Piston outside diameter is 340mm, and piston head 5 is connected through bolt 4 with piston skirt 3, and said piston head 5 is the steel piston head, and piston skirt 3 is processed by spheroidal graphite cast iron, and the high H of centre is 240-280mm, and the firepower bank height h of piston is 50-90mm.Piston pin hole is positioned at piston skirt 3 middle parts, and wherein, the high H of centre is the distances of piston head 5 tops to piston pin hole axis 10, and firepower bank height h is the distances of piston head 5 tops to the first road piston gas ring top edge.

As shown in Figure 1, the utility model 340mm bore diesel engine piston comprises the piston head 5 of steel and the piston skirt 3 that spheroidal graphite cast iron is processed, and this piston head 5 can link together through a plurality of bolts with piston skirt 3.

The bolt 4 that connects piston head 5 and piston skirt 3 is a stud bolt; And piston head 5 bottoms are provided with tapped blind hole; The blind hole shape that is centrosymmetric is distributed in piston head 5 bottoms, and the head of piston skirt 3 is provided with through hole, and is suitable with blind hole; Rectangular or the square symmetry of through hole is distributed in the top of the piston skirt 3 of spheroidal graphite cast iron, and stud bolt, blind hole are corresponding with the number and the position of through hole.One of bolt 4 is terminated in the blind hole, and the other end passes through hole and fixes through nut 1 bolt.For reducing, impacts on the head that makes nut 1 and spheroidal graphite cast iron piston skirt 3; Prevent thread looseness; One elastic sleeve 2 is set between each bolt 4 and the spheroidal graphite cast iron piston skirt 3; And outside the elastic sleeve 2 cover bolts 4, two ends are clamped by nut 1 and piston skirt 3, thereby the bolt of realization piston head 5 and piston skirt 3 is with fixing.

In practical application, the preferred 262.5mm of the high H of this instance centre, the preferred 62mm of piston junk height h.

In conjunction with Fig. 2; Piston head 5 is connected through four bolts 4 with piston skirt 3; And four through holes of the piston skirt 3 of four blind holes of corresponding piston head 5 and spheroidal graphite cast iron respectively, said bolt 4 and through hole, blind hole are filled in the axis of symmetry 11 along the first plug axis of symmetry 10, second of living and are uniformly distributed with; In the plane at Fig. 2 place, be the first mistake centerline hole 12 with adjacent two through hole circle center line connectings, two perpendicular through hole circle center line connectings are the second mistake centerline hole 13; It is parallel that the second piston axis of symmetry 11 and second is crossed centerline hole 13, and size S is 60mm-75mm; It is parallel that the second piston axis of symmetry 11 and first is crossed centerline hole 12, and size L is 75mm-60mm.

The cooling blind hole 8 of the piston head 5 of the utility model 340mm bore diesel engine piston is the inclined hole of certain diameter; With piston vertical axis 7 angles be sharp angle; The value of α is 15 °-25 °; At first oil pump arrives connecting rod and wrist pin with the oil delivery in the oil sump; Get into the outer cold house of piston head 5 and piston skirt 3 and cooling blind hole 8 formations then through the oil inlet hole on the spheroidal graphite cast iron piston skirt 3, part machine oil oilhole 9 gets into cold house 6 in piston skirt 3 tops and the piston head simultaneously, because the violent to-and-fro motion of piston; Machine oil is taken away the heat that combustion gas pass to piston in inside and outside cooling chamber vibration cooling, and machine oil returns oil sump through the big spill port in the center on the piston skirt 3 then.Fig. 3 is the worm's eye view of this piston head 5, the even or non-uniform Distribution in blind 8 holes of a plurality of coolings, and cooling blind hole 8 diameters are between φ 20mm-φ 25mm.

The diesel engine piston of the 340mm cylinder diameter of the utility model; Distributing rationally of structure that is connected with the spheroidal graphite cast iron piston skirt through said steel piston head and each several part dimensional parameters; Having solved in the past, piston bears heat load and the low technological deficiency of pressure of explosion; Reach at pressure of explosion under the situation of 20MPa, the reliability and the durability of the diesel engine piston of the utility model all satisfy the demands.

Claims

1. diesel engine piston; Comprise interconnective piston head and piston skirt, it is characterized in that: piston head is connected through bolt with piston skirt, and said piston head is the steel piston head; Piston skirt is processed by spheroidal graphite cast iron; The outside diameter of piston is 340mm, and the centre height is 240-280mm, and the firepower bank height of piston is 50-90mm.

2. diesel engine piston as claimed in claim 1; It is characterized in that: the piston head bottom is provided with at least two tapped blind holes; Corresponding position, piston skirt top is provided with through hole; Be connected through stud bolt between piston head and the piston skirt, an end of stud bolt screws in the blind hole on the piston head, and the other end passes through hole and through nut check.

3. diesel engine piston as claimed in claim 2 is characterized in that: the quantity of said bolt and through hole, blind hole is at least 4 groups, and becomes rectangle or square symmetry to arrange along piston axis; On the same horizontal plane, piston has two orthogonal axis of symmetry, is first to cross centerline hole with adjacent two through hole circle center line connectings, and first crosses centerline hole and apart 60mm-75mm parallel with axis of symmetry wherein; With first to cross two perpendicular through hole circle center line connectings of centerline hole be second to cross centerline hole, second to cross centerline hole parallel with another axis of symmetry, apart 75mm-60mm.

4. diesel engine piston as claimed in claim 1; It is characterized in that: the bottom of said piston head is distributed with the cooling blind hole; The quantity of cooling blind hole is 25-30, and the diameter of cooling blind hole is 20mm-25mm, and the angle of cooling blind hole axis and piston vertical axis is 15 °-25 °.