CN106948966B - Motor-driven variable compression ratio piston - Google Patents
Motor-driven variable compression ratio piston Download PDFInfo
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- CN106948966B CN106948966B CN201710364176.9A CN201710364176A CN106948966B CN 106948966 B CN106948966 B CN 106948966B CN 201710364176 A CN201710364176 A CN 201710364176A CN 106948966 B CN106948966 B CN 106948966B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0015—Multi-part pistons
- F02F3/0023—Multi-part pistons the parts being bolted or screwed together
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/044—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of an adjustable piston length
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a motor-driven variable compression ratio piston, which aims to solve the problems of high manufacturing cost, poor reliability and complex structure in the prior art. The piston is composed of a piston top, a piston skirt part, a first limiting hole, a first limiting ball spring, a first dismounting hole, a first sliding limiting groove, a first limiting bolt, a motor, a second limiting bolt, a second sliding limiting groove, a second dismounting hole, a second limiting spring, a second limiting ball, a second limiting hole, a spline sleeve and a spline groove; the motor is arranged on the central tray of the piston skirt part and fixed by bolts, the rotor of the motor is in interference fit with the spline sleeve, the spline sleeve is inserted into the spline groove, and the piston skirt part is in threaded connection with the top of the piston. The motor rotates to drive the top of the piston to rotate, and meanwhile, the top of the piston moves up and down relative to the skirt of the piston, so that the compression ratio is increased and decreased.
Description
Technical Field
The invention relates to a piston of an engine for a vehicle, in particular to a motor-driven variable compression ratio piston.
Background
With the development of society, energy reserves are reduced, the environment is more and more seriously influenced by human activities, and increasingly strict emission regulations put higher requirements on engines, wherein the compression ratio is an important factor influencing the economy of the engines. The compression ratio of the engine is the ratio of the cylinder volume when the piston moves to the bottom dead center to the cylinder volume when the piston moves to the top dead center, and the performance and efficiency of the engine can be effectively improved by increasing the compression ratio. Generally, the higher the compression ratio of the engine is, the longer the piston power stroke is, the more power is applied, and the larger the output power is. However, an excessive compression ratio in a gasoline engine may cause uncontrollable combustion to damage the engine, and knocking is likely to occur when a load is large; the excessive compression ratio in the diesel engine causes the cylinder pressure of the diesel engine to be too high, so that the vibration noise is aggravated, and the impact load born by a moving part is increased, thereby influencing the working reliability and the service life of the diesel engine. Therefore, it is necessary to adopt the variable compression ratio technique according to the change of the engine load.
With variable compression ratio technology it is possible to:
1. by improving the thermal efficiency of the engine, the economy of the engine is improved.
2. The probability of generating the knocking is reduced, and the stability of the operation of the engine is facilitated.
3. The engine is convenient to be miniaturized and designed in a light weight mode.
4. Is favorable for full combustion of fuel and improves emission.
The invention provides a motor-driven variable compression ratio piston, which aims to solve the technical problems of high manufacturing cost, poor reliability and complex structure in the prior art.
Disclosure of Invention
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
the invention relates to a motor-driven variable compression ratio piston, which comprises a piston top, a piston skirt part, a first limiting hole, a first limiting ball spring, a first dismounting hole, a first sliding limiting groove, a first limiting bolt, a motor, a second limiting bolt, a second sliding limiting groove, a second dismounting hole, a second limiting spring, a second limiting ball, a second limiting hole, a spline sleeve and a spline groove, and is characterized in that:
the motor is placed in the piston skirt portion, and the motor is fixed on the piston skirt portion through the first limiting bolt and the second limiting bolt.
The rotor of motor and spline sleeve interference fit, the inside upper end in piston top is opened there is the spline groove, spline sleeve inserts in the spline groove, spline sleeve and piston top clearance fit.
The motor-driven variable compression ratio piston comprises a piston top and a piston skirt, wherein the piston top is connected with the piston skirt through a trapezoidal section thread, and the piston top and the piston skirt rotate coaxially under the driving of a motor to realize relative up-and-down movement.
The piston skirt part is provided with a first limiting hole and a second limiting hole, a first limiting ball and a first limiting spring are arranged in the first limiting hole, the first limiting ball and the first limiting spring are in sliding connection with the first limiting hole, a second limiting ball and a second limiting spring are arranged in the second limiting hole, and the second limiting ball and the second limiting spring are in sliding connection with the second limiting hole.
The root department of the internal screw thread in piston top mill and has milled first slip spacing groove, the spacing groove that the second slides, first slip spacing groove, the spacing groove cross section that the second slides are the rectangle, first slip spacing groove, the spacing groove that the second slides is the arc and with root surface smooth transition along the root surface, the degree of depth of first slip spacing groove, the spacing groove that the second slides reduces along the root surface gradually, it has first dismantlement hole to bore at the piston top, the second dismantlement hole communicates with each other with first slip spacing groove, the spacing groove that the second slides respectively.
Compared with the prior art, the invention has the beneficial effects that:
1. the motor-driven variable compression ratio piston only consists of an upper body and a lower body of the piston, the upper body and the lower body of the piston are in threaded connection, and the motor-driven variable compression ratio piston is simple in structure and easy to install.
2. The motor-driven variable compression ratio piston changes the compression ratio by additionally arranging the motor mechanism in the piston, and has high reliability and good manufacturability.
3. According to the motor-driven variable compression ratio piston, the piston main body is driven by the motor to rotate relative to the piston skirt, and the pressure of the cylinder cannot be transmitted to the motor due to the self-locking effect of the threads, so that the normal operation of the motor is ensured, and the work is reliable.
4. The motor-driven variable compression ratio piston only changes the interior of the piston, avoids the change of a cylinder cover and a crankshaft, and reduces the design cost.
5. The motor-driven variable compression ratio piston is provided with a limiting device, and a sliding limiting groove and a limiting ball are arranged to prevent the upper part and the lower part of the piston from separating.
6. The motor-driven variable compression ratio piston provided by the invention is provided with the limiting device, the skirt part of the piston is provided with the dismounting hole, the dismounting can be realized by utilizing the thimble, and the maintenance and the part replacement are easy.
Drawings
The invention is further described with reference to the accompanying drawings in which:
FIG. 1 is a full sectional view of an assembly drawing of an electric motor-driven variable compression ratio piston according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
FIG. 4 is a front cross-sectional view of the piston crown of the present invention;
FIG. 5 is a D-D projection view of a front cross-sectional view of the piston crown of the present invention;
FIG. 6 is an enlarged partial view at C of FIG. 5;
FIG. 7 is a front cross-sectional view of the piston skirt of the present invention;
FIG. 8 is a side elevational view, in full section, of the skirt portion of the piston of the present invention;
FIG. 9 is a top view of the piston skirt of the present invention;
FIG. 10 is a front view of the motor of the present invention;
FIG. 11 is a top view of the motor of the present invention;
FIG. 12 is a front cross-sectional view of the spline sleeve of the present invention;
FIG. 13 is a bottom plan view of the splined sleeve of the present invention;
in the figure: 1. the piston comprises a piston top, 2 parts of a piston skirt, 3 parts of a first limiting hole, 4 parts of a first limiting ball, 5 parts of a first limiting spring, 6 parts of a first dismounting hole, 7 parts of a first sliding limiting groove, 8 parts of a first limiting bolt, 9 parts of a motor, 10 parts of a second limiting bolt, 11 parts of a second sliding limiting groove, 12 parts of a second dismounting hole, 13 parts of a second limiting spring, 14 parts of a second limiting ball, 15 parts of a second limiting hole, 16 parts of a spline sleeve and 17 parts of a spline groove.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
as shown in fig. 1, a motor 9 is placed in a circular tray inside a piston skirt 2, the motor 9 is fixed on the circular tray inside the piston skirt 2 by a first limit bolt 8 and a second limit bolt 10, a rotor of the motor 9 is in interference fit connection with a spline sleeve 16, a spline groove 17 is formed in the upper end inside a piston top 1, the spline sleeve 16 is in clearance fit with the spline groove 17, and the piston top 1 is in threaded connection with the piston skirt 2 through a trapezoidal section; the piston skirt 2 is provided with a first limiting hole 3 and a second limiting hole 15, a first limiting ball 4 and a first limiting spring 5 are arranged in the first limiting hole 3, the first limiting ball 4 and the first limiting spring 5 are in sliding connection with the first limiting hole 3, a second limiting ball 14 and a second limiting spring 13 are arranged in the second limiting hole 15, the second limiting ball 14 and the second limiting spring 13 are in sliding connection with the second limiting hole 15, and the piston top 1 is provided with a first dismounting hole 6, a first sliding limiting groove 7, a second dismounting hole 12 and a second sliding limiting groove 11.
As shown in fig. 1 and 2, the piston skirt 2 is provided with a first limiting hole 3 and a second limiting hole 15, the first limiting ball 4 and the first limiting spring 5 are installed in the first limiting hole 3, the first limiting ball 4 and the first limiting spring 5 are slidably connected with the first limiting hole 3, and the connection relationship between the second limiting ball 14 and the second limiting spring 13 and the second limiting hole 15 is completely the same as the connection relationship between the first limiting ball 4 and the first limiting spring 5 and the first limiting hole 3.
As shown in fig. 1 and 3, the piston top 1 is provided with a first dismounting hole 6, a first sliding limiting groove 7, a second dismounting hole 12 and a second sliding limiting groove 11.
As shown in fig. 1, 3, 4, 5 and 6, the inner side of the piston top 1 is a trapezoidal section internal thread, the top end of the inner part of the piston top 1 is provided with a spline groove 17, the first sliding limiting groove 7 is arranged at the tooth root of the internal thread of the piston top 1, the section of the first sliding limiting groove 7 is rectangular, the first sliding limiting groove 7 is arc-shaped along the tooth root surface and gradually reduces the depth along the clockwise direction, the shape and the size of the second sliding limiting groove 11 are completely the same as those of the first sliding limiting groove 7, the first sliding limiting groove 7 and the second sliding limiting groove 11 are symmetrical about the central axis of the piston top 1, the first dismounting hole 6 is arranged at the lower end of the piston top 1, the first dismounting hole 6 is communicated with the first sliding limiting groove 7, and the second dismounting hole 12 and the first dismounting hole 6 are symmetrical about the central axis of the piston top 1.
As shown in fig. 1, 7, 8 and 9, the piston skirt 2 is provided with a first limiting hole 3 and a second limiting hole 15, a circular tray is arranged in the middle inside the piston skirt 2, the tray is provided with a circular groove, and two threaded holes are formed inside the groove.
As shown in fig. 1, 10 and 11, the motor 9 is cylindrical, the cross section of the rotor of the motor is arc-shaped, the upper end of the motor 9 is a disk, and two bolt holes are formed in the disk.
As shown in fig. 1, 12 and 13, the outside of the spline sleeve 16 is a spline, the inside of the spline sleeve 16 is hollow with an arcuate section, the outside of the spline sleeve 16 is in clearance fit with the spline groove 17, and the inner hole of the spline sleeve 16 is in interference fit with the rotor of the motor 9.
As shown in fig. 1, when the engine needs a large compression ratio, the motor 9 rotates, torque is applied to the piston top 1 through the spline sleeve 16, the piston top 1 and the piston skirt 2 rotate relatively, the piston top 1 moves upward relative to the piston skirt, the compression ratio is increased, when the piston top 1 moves upward to a certain distance, the first limit ball 4 enters the first sliding limit groove 7 under the elastic force of the first limit spring 5, the second limit ball 14 enters the second sliding limit groove 15 under the elastic force of the second limit spring 13, at this time, the piston top 1 cannot move upward relative to the piston skirt 2 continuously, and the compression ratio reaches the maximum; when the engine needs a small compression ratio, the motor 9 rotates reversely, the piston top 1 and the piston skirt 2 rotate relatively, the piston top 1 moves downwards relative to the piston skirt 2, and the compression ratio is reduced. The cylinder pressure generated by violent combustion acts on the top end of the piston top 1, and because of the self-locking property of the internal screw of the piston top 1, the combustion pressure can not forcibly push the piston top 1 to move relative to the piston skirt 2, and the compression ratio of the engine is kept in a constant state at the moment, and the motor 9 does not need to rotate; in the process of disassembling the piston top 1 and the piston skirt part 2, the first limiting ball 4 can enter the first sliding limiting groove 7 under the elastic action of the first limiting spring 5, the second limiting ball 14 can enter the second sliding limiting groove 15 under the elastic action of the second limiting spring 13, and at the moment, the disassembly can be completed only by ejecting the first limiting ball 4 and the second limiting ball 14 into the first limiting hole 3 and the second limiting hole 15 respectively by using ejector pins with the diameters smaller than the diameters of the first disassembling hole 6 and the second disassembling hole 12.
Claims (2)
1. A motor-driven variable compression ratio piston is characterized by comprising a piston top (1), a piston skirt part (2), a first limiting hole (3), a first limiting ball (4), a first limiting spring (5), a first dismounting hole (6), a first sliding limiting groove (7), a first limiting bolt (8), a motor (9), a second limiting bolt (10), a second sliding limiting groove (11), a second dismounting hole (12), a second limiting spring (13), a second limiting ball (14), a second limiting hole (15), a spline sleeve (16) and a spline groove (17), wherein the piston top (1) is in threaded connection with the piston skirt part (2) through a trapezoidal section, the piston top (1) and the piston skirt part (2) coaxially rotate under the driving of the motor (9) to realize relative up-down movement, the piston skirt part (2) is provided with the first limiting hole (3) and the second limiting hole (15), the first limiting ball (4) and the first limiting spring (5) are arranged in the first limiting hole (3), the second limiting ball (14) is in the second limiting hole (13), the first limiting ball (4) and the second limiting spring (13), the piston comprises a second limiting ball (14), a second limiting spring (13) and a second limiting hole (15) which are in sliding connection, a first sliding limiting groove (7) and a second sliding limiting groove (11) are milled at the root of an internal thread of the piston top (1), a first dismounting hole (6) is drilled in the piston top (1), a second dismounting hole (12) is respectively communicated with the first sliding limiting groove (7) and the second sliding limiting groove (11), a motor (9) is placed in a piston skirt portion (2), the motor (9) is fixed on the piston skirt portion (2) through the first limiting bolt (8) and the second limiting bolt (10), a rotor of the motor (9) is in interference fit with a spline sleeve (16), the spline groove (17) is formed in the upper end of the interior of the piston top (1), the spline sleeve (16) is inserted into the spline groove (17), and the spline sleeve (16) is in clearance fit with the piston top (1).
2. An electric motor driven variable compression ratio piston according to claim 1, characterized in that the first sliding limiting groove (7) and the second sliding limiting groove (11) are rectangular in cross section, the first sliding limiting groove (7) and the second sliding limiting groove (11) are arc-shaped along the tooth root surface and smoothly transition with the tooth root surface, and the depths of the first sliding limiting groove (7) and the second sliding limiting groove (11) are gradually reduced along the tooth root surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710364176.9A CN106948966B (en) | 2017-05-22 | 2017-05-22 | Motor-driven variable compression ratio piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710364176.9A CN106948966B (en) | 2017-05-22 | 2017-05-22 | Motor-driven variable compression ratio piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106948966A CN106948966A (en) | 2017-07-14 |
| CN106948966B true CN106948966B (en) | 2023-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710364176.9A Active CN106948966B (en) | 2017-05-22 | 2017-05-22 | Motor-driven variable compression ratio piston |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107956593B (en) * | 2017-12-05 | 2023-11-17 | 吉林大学 | Dual-motor type variable compression ratio piston |
| CN108757206B (en) * | 2018-05-14 | 2020-05-08 | 重庆长安汽车股份有限公司 | Variable compression ratio piston and variable compression ratio engine |
| CN114198212A (en) * | 2021-11-29 | 2022-03-18 | 马义礼 | Compression ratio adjustable internal combustion engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10304685A1 (en) * | 2003-02-05 | 2004-08-26 | Forschungsinstitut für Kraftfahrwesen und Fahrzeugmotoren | Automotive piston engine has two-part piston with upper section and lower section separate by helical springs and travel limiting bolts |
| CN203009064U (en) * | 2012-08-18 | 2013-06-19 | 唐明龙 | Self-pumping compression ratio adjustable engine piston |
| JP2015007387A (en) * | 2013-06-25 | 2015-01-15 | 三菱自動車工業株式会社 | Piston of internal combustion engine and assembling method for the piston |
| CN105370417A (en) * | 2015-12-07 | 2016-03-02 | 吉林大学 | Piston with variable lift compression ratio |
| CN205315119U (en) * | 2016-01-20 | 2016-06-15 | 吉林大学 | Variable compression compares piston |
-
2017
- 2017-05-22 CN CN201710364176.9A patent/CN106948966B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10304685A1 (en) * | 2003-02-05 | 2004-08-26 | Forschungsinstitut für Kraftfahrwesen und Fahrzeugmotoren | Automotive piston engine has two-part piston with upper section and lower section separate by helical springs and travel limiting bolts |
| CN203009064U (en) * | 2012-08-18 | 2013-06-19 | 唐明龙 | Self-pumping compression ratio adjustable engine piston |
| JP2015007387A (en) * | 2013-06-25 | 2015-01-15 | 三菱自動車工業株式会社 | Piston of internal combustion engine and assembling method for the piston |
| CN105370417A (en) * | 2015-12-07 | 2016-03-02 | 吉林大学 | Piston with variable lift compression ratio |
| CN205315119U (en) * | 2016-01-20 | 2016-06-15 | 吉林大学 | Variable compression compares piston |
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| Publication number | Publication date |
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| CN106948966A (en) | 2017-07-14 |
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