CN109488655B - Piston assembly and design method thereof - Google Patents
Piston assembly and design method thereof Download PDFInfo
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- CN109488655B CN109488655B CN201811504524.9A CN201811504524A CN109488655B CN 109488655 B CN109488655 B CN 109488655B CN 201811504524 A CN201811504524 A CN 201811504524A CN 109488655 B CN109488655 B CN 109488655B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a piston assembly and a design method thereof, wherein a piston and a ring plug are designed into a whole, then the end of the piston plug is further optimized, an outer center (namely an outer conical surface) of the process is added, the position precision requirement of matching two important surfaces is improved, the structural size of a ring groove of the end surface of the large end of the piston is increased, the cutting space is enlarged, the cutting forming process is improved, the weight is reduced, and the weight is reduced by 14.1%; meanwhile, the number of parts is reduced, the production management is simplified, and the manufacturing cost is reduced.
Description
Technical Field
The invention relates to the technical field of hydraulic actuating cylinders, in particular to optimization of structural design of a piston assembly of a hydraulic actuating cylinder.
Background
The assembly shown in figure 1 is an aircraft engine ram. The rodless cavity of the actuator cylinder is communicated with the inner layer cavity of the piston to form an oil path, the rod cavity is communicated with the middle layer of the piston through an inclined hole at the head of the piston to form another oil path, and the oil path is of a double-layer structure at the rod part of the piston. The existing piston with a double-layer inner cavity structure consists of two parts, one part is a piston 1, the other part is a ring plug 2, the ring plug 2 is of a U-shaped structure, the ring plug 2 is assembled in a stepped hole at the large end of the piston 1, and the outer side of the U shape is welded into a piston assembly by adopting a vacuum electron beam; the middle of the piston assembly is provided with a ring groove, the double-oil-way pipe seat assembly 3 is assembled at the later stage and is welded with the U-shaped inner side of the ring plug 2, and a rod cavity oil way is formed in the middle of the piston.
The double-layer piston assembly is designed based on the machining and manufacturing capability of the twenty-first 90 years, for the manufacturing capability at that time, the piston is designed to be a split structure, the inner cavity of a piston part is a stepped hole, the machining and forming of the inner cavity are facilitated, and then the ring plugs are assembled and welded on the rodless ends of the piston to complete the manufacturing of the piston assembly. Firstly, welding deformation causes the finished precision of a single piece to be lost, particularly the relative position precision of excircle phi d1 and phi d2 of a matching surface, allowance is reserved on the two excircle surfaces before welding, welding does not exist because a reference A is occupied by a ring plug, a finish machining process is not easy to implement, the position precision of phi d1 and phi d2 is high, and direct clamping cannot be realized, so that the design of the position precision of phi d2 by phi d1 cannot provide high requirements, and the bounce tolerance of phi d1 to phi d2 is designed to be 0.10 at present; secondly, one more part increases material consumption, production organization and management difficulty and management cost; thirdly, the vacuum electron beam welding process is complex, a welding test needs to be carried out before welding, the penetration rate is checked, welding parameters are determined, and a welding simulation piece needs to be configured when each batch of components are manufactured; fourthly, the position of the welding seam cannot be reasonably provided with a film, the X-ray cannot detect the internal defect of the welding seam, the internal defect of the welding seam cannot be controlled by 100 percent, and hidden danger still exists in later work; fifthly, in order to guarantee welding quality, the cleanness of a welding part needs to be controlled, parts are cleaned before welding and then dried in vacuum, acetone is used for cleaning and waiting for welding during welding, vacuumizing is performed, a welding seam is checked after welding and is unqualified, repair welding is needed, and the like, and sixth, the strength of the welding seam is only 70% of that of a base metal.
Disclosure of Invention
The invention aims to solve the technical problem of providing a piston inner cavity structure and a design method thereof, which improve the manufacturing manufacturability of a component, improve the manufacturing precision of parts, improve the component strength, reduce the number of parts and simplify the production management on the premise of not changing the structural dimension of the welding part between the later stage of a piston component and a double-oil-way pipe seat (namely the structural dimension of the U-shaped inner side of an annular plug) and the strength of the whole component.
A design method of piston inner cavity structure, under the situation that does not change the inside structure size of "U" shape of the former ring end cap, whole assembly intensity, design piston and ring end cap as an organic whole, further optimize afterwards, increase the outer top of the craft, improve and cooperate two important working surfaces Phid 1, Phid 2 position precision design requirements; the size of the ring groove structure of the end face of the large end of the piston is increased, the weight is reduced, and meanwhile, the buffering effect of the end groove in working is not influenced.
A novel inner cavity structure of the piston assembly is formed according to the design method, and comprises an inner conical surface N arranged at the end of the piston plug, an outer conical surface H arranged at the outer side of the end of the piston plug and an outer conical surface F serving as a process center.
The outer conical surface H is a conical surface tangent to the bottom arc D of the U-shaped groove of the optimized front ring plug and the bottom arc C of the end surface ring groove of the piston;
the inner conical surface N is positioned at the position where the non-U-shaped end of the original ring plug is connected with the cylindrical surface of an inner cavity hole phi D2 of the piston;
the outer side of the end of the piston plug is connected with an outer conical surface H through an outer conical surface F serving as a process center;
preferably, the connecting position of the inner conical surface N of the original plug of the piston, which is not a U-shaped end, and the cylindrical surface of the inner cavity hole phi D2 of the piston is rounded, and the taper of the inner conical surface N is 900.
Preferably, the taper of the outer conical surface F of the piston end used as a process center is 600.
Preferably, the junction between the outer conical surface F and the outer conical surface H is rounded.
Compared with the existing actuating cylinder, the invention optimally designs the inner cavity structure of the existing piston assembly, and improves the manufacturing precision of parts under the condition of not changing the assembling and welding structure and strength of the double-oil-way pipe seat assembly at the later stage; the outer center (namely the outer conical surface) of the process is designed, so that the manufacturability of the assembly is improved; the size of the end face ring groove of the piston head is increased, the cutting space is increased, the cutting forming process is improved, the weight is reduced, and the weight is reduced by 14.1%; the number of parts is reduced, the production management is simplified, and the manufacturing cost is reduced.
Drawings
Fig. 1 is a schematic view of the actuator cylinder of the present invention;
FIG. 2 is a schematic view of a piston assembly prior to optimization;
FIG. 3 is a schematic view of an optimized piston assembly of the present invention;
in the figure, 1 is a piston, 2 is a ring plug, 3 is a double-oil-way pipe seat component, phi D4 is the assembly matching surface of the ring plug and the piston, C is the circular groove bottom arc of the ring end face of the piston, D is the circular groove bottom arc of the U-shaped end face of the ring plug, H is an external conical surface tangent to the circular groove bottom arc D of the U-shaped end face of the ring plug and the circular groove bottom arc C of the end face of the piston, F is an external conical surface of a process tip, and N is an internal conical surface of the non-U-shaped end of the ring plug connected with the phi D2 cylindrical surface of an inner cavity hole of the piston.
Detailed Description
The inner cavity structure of the ram of the present invention will be described with reference to the accompanying drawings.
Referring to fig. 2, the piston assembly of the engine nozzle actuator cylinder is formed by assembling and welding a piston 1 and a ring plug 2, wherein the ring plug 2 is U-shaped. The ring plug 2 is assembled in a stepped hole at the large end of the piston 1, and then the U-shaped outer side and the piston 1 are welded into an assembly by adopting vacuum electron beams.
The outer circle of the ring plug 2 is matched with an inner hole of the piston 1, the size is phi 24, the size of a joint at the welding position of the U-shaped outer side of the ring plug 2 is 1mm multiplied by 2mm, the size of a corresponding joint at the position to be welded of the piston 1 is also 1mm multiplied by 2mm, inner cavity holes phi D1 and phi D2 of the piston 1, the size of an inner cavity hole phi D3 of the ring plug 2 is respectively phi 16, phi 18 and phi 14, the size of length L1, L2 and L3 are respectively 7, 85 and 103, and the runout tolerance of the outer circles phi D1 and phi D2 to a reference A, namely the runout tolerance of the axis of the hole phi D4 is 0.10.
In the invention, the piston 1 is designed into an integral structure, as shown in fig. 3, the specific design method is as follows:
1. the piston 1 and the ring plug 2 are designed into a whole and are integrally processed and molded.
2. A conical surface of 900 is arranged by taking a point B adjacent to a cavity hole phi D2 and a phi D4 of the piston 1 as a starting point, and the starting point B is rounded with R2.
3. And (3) making a common tangent line tangent to the bottom arc D of the U-shaped end groove of the original ring plug 2 and the bottom arc C of the end groove of the end surface of the piston 1, and rotating to form a conical surface by taking the axis of the piston 1 as a rotation axis to change the end groove of the ring plug 2 into a solid body.
4. And (3) making a solid cylinder of phi 22, wherein the generatrix of the cylinder is intersected with the common tangent line made in the step (3), the intersection point is E, and the intersection point is rounded R2.
5. The phi 22 cylinder is a reverse 60-degree conical surface, the length of the conical surface is 3.5mm, and the surface roughness Ra value of the conical surface is 0.8 um.
6. Taking the excircle Φ d2 of the piston as a reference, marking as G, designing the runout of the Φ d1 to the excircle Φ d2 to be 0.05, and marking:
Claims (3)
1. piston assembly comprising a piston (1), characterized in that: an inner conical surface N is arranged at the plug end of the piston (1), and an outer conical surface H and an outer conical surface F serving as a process tip are arranged on the outer side of the plug end of the piston (1);
the inner conical surface N is positioned at the connecting part of the non-U-shaped end of the ring plug (2) and the cylindrical surface of an inner cavity hole phi D2 of the piston;
the outer conical surface H is an outer conical surface tangent to a groove bottom arc D at the U-shaped end of the ring plug (2) and a groove bottom arc C of the end face ring groove of the piston (1), and one end of the outer conical surface H is connected with an outer conical surface F serving as a process tip;
one end of the inner conical surface N is provided with a radius, the radius is positioned at the connecting part of the non-U-shaped end of the ring plug (2) and the cylindrical surface of the inner cavity hole phi D2 of the piston, and the taper of the inner conical surface N is 900；
The junction of the outer conical surface H tangent to the circular arc D at the bottom of the U-shaped end groove of the ring plug (2) and the circular arc C at the bottom of the circular groove at the end surface of the piston (1) and the outer conical surface F serving as the process tip is provided with a radius;
the taper of the outer conical surface F of the plug end of the piston (1) as a process center is 600。
2. The design method of the piston assembly comprises a piston (1) and a ring plug (2), wherein the piston (1) comprises an inner cavity hole phi D2, an excircle phi D1 and an excircle phi D2 of the piston (1), a groove bottom arc C is arranged on an end surface ring groove at one end of the piston (1), a groove bottom arc D is arranged on an end surface ring groove at the end surface of the ring plug (2), and the ring plug (2) is provided with an inner cavity hole phi D3, and is characterized in that: the piston (1) and the ring plug (2) are of an integral structure, a 90-degree conical surface is arranged by taking a transition point of an inner cavity hole phi D2 of the piston (1) and an inner cavity hole phi D3 of the ring plug (2) as a starting point, and the starting point is rounded;
a common tangent of a groove bottom arc D of the ring groove on the end surface of the ring plug (2) and a groove bottom arc C of the ring groove on the end surface of the piston (1) is taken as a generatrix, and the axis of the piston (1) is taken as an axis to generate a revolving body;
and (3) defining the jumping value of the outer circle phi d1 of the piston (1) relative to the outer circle phi d2 by taking the outer circle phi d2 of the piston (1) as a reference.
3. The method of designing a piston assembly of claim 2, wherein: one end of the revolving body is provided with a cone which is coaxial and connected with the revolving body, and the taper of the cone is 600。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811504524.9A CN109488655B (en) | 2018-12-10 | 2018-12-10 | Piston assembly and design method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811504524.9A CN109488655B (en) | 2018-12-10 | 2018-12-10 | Piston assembly and design method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN109488655A CN109488655A (en) | 2019-03-19 |
| CN109488655B true CN109488655B (en) | 2020-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811504524.9A Active CN109488655B (en) | 2018-12-10 | 2018-12-10 | Piston assembly and design method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202250452U (en) * | 2011-08-29 | 2012-05-30 | 杭州华春汽车活塞有限公司 | Double-trapezoid-shaped piston with inlaid ring |
| CN106736692A (en) * | 2016-12-23 | 2017-05-31 | 贵州黎阳航空动力有限公司 | One kind manufacture engine driveshaft multi-grab |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202250446U (en) * | 2011-08-29 | 2012-05-30 | 杭州华春汽车活塞有限公司 | Integral piston with inner chamber |
| CN202250444U (en) * | 2011-08-29 | 2012-05-30 | 杭州华春汽车活塞有限公司 | Piston of internal combustion engine |
| NO342225B1 (en) * | 2016-03-16 | 2018-04-16 | Kepp Tech As | Device for protection against leakage from seals between a cylinder housing and a piston rod |
| WO2018038282A1 (en) * | 2016-08-23 | 2018-03-01 | 볼보 컨스트럭션 이큅먼트 에이비 | Hydraulic cylinder device |
| CN108637612B (en) * | 2018-05-16 | 2020-12-22 | 遵义市遵云制冷配件有限公司 | Machining process of piston for aero-engine |
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2018
- 2018-12-10 CN CN201811504524.9A patent/CN109488655B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202250452U (en) * | 2011-08-29 | 2012-05-30 | 杭州华春汽车活塞有限公司 | Double-trapezoid-shaped piston with inlaid ring |
| CN106736692A (en) * | 2016-12-23 | 2017-05-31 | 贵州黎阳航空动力有限公司 | One kind manufacture engine driveshaft multi-grab |
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| Publication number | Publication date |
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| CN109488655A (en) | 2019-03-19 |
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