CN205370782U - Engine piston - Google Patents
Engine piston Download PDFInfo
- Publication number
- CN205370782U CN205370782U CN201620012337.9U CN201620012337U CN205370782U CN 205370782 U CN205370782 U CN 205370782U CN 201620012337 U CN201620012337 U CN 201620012337U CN 205370782 U CN205370782 U CN 205370782U
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- piston
- pin
- boss
- engine
- piston pin
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Abstract
The utility model belongs to the engine field, concretely relates to engine piston. Engine piston includes piston boss and piston pin stopping ring groove, the piston boss uses the piston pin hole axis for demarcating, and upper and lower two parts are hierarchic structure, and the wide lower part in upper portion is narrow, piston pin stopping ring groove outside pinhole diameter is greater than the inboard. Engine piston makes the piston boss can obtain bigger loaded area to adapt to bigger detonation pressure requirement, and piston pin stopping ring groove outside pinhole diameter is greater than the inboard can realize the assembly of piston pin normal atmospheric temperature.
Description
Technical field
This utility model belongs to engine art, is specifically related to a kind of engine piston.
Background technology
Existing piston boss generally adopts flat shape pin structure or wedge pin holder structure, and piston pin hole adopts the structure that in circlip groove, outside diameter is identical.The combustion-gas pressure that piston bears passes to piston pin by piston boss, and then passes to connecting rod to promote bent axle to rotate.Because of the raising day by day that emission performance, dynamic property, economy etc. require, combustion-gas pressure is also increasing, and supercharged diesel engine detonation pressure may be up to 20MPa, and the ability that piston bears detonation pressure it is also proposed higher requirement.
The piston of each material has the key seat of correspondence than pressure limit value, when key seat ratio is when pressing more than limit value, arises that the catastrophe failures such as key seat cracking.By formula " key seat is than pressure=gas force/key seat pressure-bearing projected area " it can be seen that when gas force one timing key seat pressure-bearing projected area is more big, key seat is more less than pressure (load that unit key seat bearing area bears, unit is MPa).But need during design piston boss to consider small end of connecting rod and connecting rob bushing intensity simultaneously, and to ensure to have between piston boss and small end of connecting rod enough safety clearances, so key seat pressure-bearing projected area can not arbitrarily strengthen.For obtaining more excellent emission performance, dynamic property, economy, diesel engine detonation pressure constantly increases, and the key seat of original flat shape key seat and wedge shape key seat aluminium recovery has exceeded limit value than pressure, it is impossible to meet instructions for use.For meeting complete machine reinforcing degree, can only adopt and add the scheme such as copper sheathing or steel pistons at aluminium recovery pin-and-hole, but this will bring significantly cost to increase.It addition, piston is little with piston pin fit clearance, room temperature state is difficult to assemble；Before assembling piston pin, piston need to being heated, efficiency of assembling is low and easily causes gudgeon pin bore, top land and skirt section and collides with.
Utility model content
For solving the above-mentioned problems in the prior art, this utility model provides a kind of engine piston so that piston boss can obtain bigger loaded area, thus adapting to more produce shockingly pressure request, and realizes the assembling of piston pin room temperature.
Technical solutions of the utility model are as follows:
A kind of engine piston, including piston boss and retaining ring for piston pin groove, described piston boss is with piston pin hole axis for boundary, and upper and lower two parts are hierarchic structure, and width bottom, top is narrow；Outside described retaining ring for piston pin groove, pin-and-hole diameter is more than inner side.
Outside described retaining ring for piston pin groove, the relation of pin-and-hole diameter of phi B and inner side pin-and-hole diameter of phi A is Φ B=Φ A+ (0.1mm～0.3mm).
Described piston boss bottom span is more than small end of connecting rod bottom width.
Wherein, piston boss supporting region (pin-and-hole top) width is very big, can obtain maximum loaded area, make piston can farthest meet high detonation pressure requirement.Small end of connecting rod and piston minimum clearance occur in piston pin hole near axis, and this utility model scheme has transitioned to minimum at piston pin hole axis place span, it is ensured that with the gap of small end of connecting rod.Piston boss bottom span is big compared with top, for reserving sufficient space bottom small end of connecting rod, can ensure connecting rob bushing bearing capacity simultaneously.After complete machine detonation pressure and connecting rob bushing bearing capacity are determined, bottom small end of connecting rod, Breadth Maximum also will be determined.For ensure piston, connecting rod properly functioning, need enough gaps between piston and small end of connecting rod, namely piston boss bottom span should be greater than small end of connecting rod bottom width.
Compared with prior art, this utility model has the technique effect of following excellence:
(1) bottom piston boss, span is certain, the stepped piston key seat top span that the utility model proposes can be accomplished minimum, namely notch cuttype key seat piston is compared with existing flat shape key seat piston and wedge shape key seat piston, both can ensure that piston was not interfered with small end of connecting rod, piston boss is made again to obtain bigger loaded area, thus adapting to more produce pressure request shockingly, it is possible to increase the scope of application of conventional aluminium piston.
(2) outside the retaining ring for piston pin groove that the utility model proposes, pin-and-hole diameter is more than the structure of inner side, outside circlip groove, pin-and-hole diameter is big, piston pin easily assembles, and piston pin is fitted into pin-and-hole inside back-up ring and play the guiding role, namely this utility model can under minimum change, realize room temperature assembling piston pin, improve efficiency of assembling.
Accompanying drawing explanation
Fig. 1 is notch cuttype key seat piston described in the utility model.
In figure, each accompanying drawing is labeled as: 1-piston boss, 2-piston pin hole, 3-retaining ring for piston pin groove.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described further:
As it is shown in figure 1, a kind of engine piston, including piston boss 1 and retaining ring for piston pin groove 3, described piston boss 1 is with piston pin hole 2 axis for boundary, and upper and lower two parts are hierarchic structure, and width bottom, top is narrow；Outside described retaining ring for piston pin groove 3, pin-and-hole diameter is more than inner side.The relation of described retaining ring for piston pin groove 3 outside diameter Φ B and inside diameter Φ A is Φ B=Φ A+ (0.1mm～0.3mm).Described piston boss 1 bottom span is more than small end of connecting rod bottom width.
Certainly, foregoing is only preferred embodiment of the present utility model, it is impossible to be considered for limiting scope of embodiments of the present utility model.This utility model is also not limited to the example above, and those skilled in the art are made impartial change and improvement etc. in essential scope of the present utility model, all should belong in patent covering scope of the present utility model.
Claims (3)
1. an engine piston, including piston boss (1) and retaining ring for piston pin groove (3), it is characterised in that described piston boss (1) is with piston pin hole (2) axis for boundary, upper and lower two parts are hierarchic structure, and width bottom, top is narrow；Described retaining ring for piston pin groove (3) outside pin-and-hole diameter is more than inner side.
2. engine piston according to claim 1, it is characterised in that the relation of described retaining ring for piston pin groove (3) outside pin-and-hole diameter of phi B and inner side pin-and-hole diameter of phi A is Φ B=Φ A+ (0.1mm～0.3mm).
3. engine piston according to claim 1, it is characterised in that described piston boss (1) bottom span is more than small end of connecting rod bottom width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620012337.9U CN205370782U (en) | 2016-01-08 | 2016-01-08 | Engine piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620012337.9U CN205370782U (en) | 2016-01-08 | 2016-01-08 | Engine piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205370782U true CN205370782U (en) | 2016-07-06 |
Family
ID=56275125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620012337.9U Active CN205370782U (en) | 2016-01-08 | 2016-01-08 | Engine piston |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205370782U (en) |
-
2016
- 2016-01-08 CN CN201620012337.9U patent/CN205370782U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |