CN107956593B - Dual-motor type variable compression ratio piston - Google Patents
Dual-motor type variable compression ratio piston Download PDFInfo
- Publication number
- CN107956593B CN107956593B CN201711266006.3A CN201711266006A CN107956593B CN 107956593 B CN107956593 B CN 107956593B CN 201711266006 A CN201711266006 A CN 201711266006A CN 107956593 B CN107956593 B CN 107956593B
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- China
- Prior art keywords
- limiting
- piston
- driving gear
- piston skirt
- motor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000006835 compression Effects 0.000 title claims abstract description 34
- 238000007906 compression Methods 0.000 title claims abstract description 34
- 230000005540 biological transmission Effects 0.000 claims abstract description 32
- 230000007704 transition Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a double-motor type variable compression ratio piston, which consists of a piston top, a piston skirt, a first limiting ball, a first limiting hole, a first limiting spring, a first nut, a first driving gear, a first key, a first limiting bolt, a first clamping ring, a limiting groove, a first bearing, a second clamping ring, a first transmission rod, a first motor, a second limiting bolt, a second limiting hole, a second limiting ball, a second limiting spring, a second nut, a second key, a second driving gear, a third clamping ring, a fourth clamping ring, a second bearing, a second transmission rod and a second motor; the first motor and the second motor are fixed on the piston skirt pin seat through bolts, the first driving gear and the second driving gear are respectively arranged on the first driving rod and the second driving rod, the first driving gear and the second driving gear are meshed with gear teeth on the top of the piston, the first motor and the second motor rotate to drive the top of the piston to rotate, and meanwhile the top of the piston moves up and down relative to the piston skirt, so that the compression ratio is increased and reduced.
Description
Technical Field
The invention relates to a piston of an engine for a vehicle, in particular to a double-motor type variable compression ratio piston.
Background
With the development of society, energy reserves are reduced, the environment is more and more severely affected by human activities, and increasingly strict emission regulations place higher demands on engines, wherein compression ratio is an important factor affecting engine economy. The compression ratio of the engine refers to 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 the efficiency of the engine can be effectively improved by increasing the compression ratio. In general, the higher the compression ratio of the engine, the longer the piston working stroke, the more work is done, and the greater the output power. However, excessive compression ratio in gasoline engines can lead to uncontrolled combustion, thereby damaging the engine and being prone to knock when the load is relatively large; the excessive compression ratio in the diesel engine leads to the excessive high pressure of the cylinder of the diesel engine, so that the vibration noise is aggravated, and the impact load born by the moving parts is increased, thereby influencing the working reliability and the service life of the diesel engine. Therefore, it is necessary to employ a variable compression ratio technique according to a variation in engine load.
The variable compression ratio technique can be used:
1. by improving the thermal efficiency of the engine, the economy of the engine is improved.
2. The probability of knocking is reduced, and the stability of engine operation is facilitated.
3. The engine is convenient for miniaturization and light weight design.
4. Is favorable for the full combustion of fuel and improves the emission.
Disclosure of Invention
The invention provides a double-motor type variable compression ratio piston, which solves the technical problems of high manufacturing cost, poor reliability and complex structure in the prior art.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
the invention discloses a double-motor type variable compression ratio piston, which comprises a piston top, a piston skirt, a first limiting ball, a first limiting hole, a first limiting spring, a first nut, a first driving gear, a first key, a first limiting bolt, a first clamping ring, a first limiting groove, a first bearing, a second clamping ring, a first transmission rod, a first motor, a second limiting bolt, a second limiting hole, a second limiting ball, a second limiting spring, a second nut, a second key, a second driving gear, a third clamping ring, a fourth clamping ring, a second bearing, a second transmission rod and a second motor, and is characterized in that:
the first motor is fixed at the bottom of a pin seat of the piston skirt through a bolt, the second motor is fixed at the bottom of the pin seat of the piston skirt through a bolt, the first bearing is embedded at the top end of the pin seat of the piston skirt, the first bearing is in transition fit with the first transmission rod, the second clamping ring is used for fixing the first bearing on the piston skirt, the second bearing is embedded at the top end of the pin seat of the piston skirt, the second bearing is in transition fit with the second transmission rod, the fourth clamping ring is used for fixing the second bearing on the piston skirt, the top of the piston is in threaded connection with the piston skirt, the first driving gear is arranged on the first transmission rod, and the second driving gear is arranged on the second transmission rod.
The driving gear I and the driving rod I are provided with key grooves, the key I is arranged in the key groove between the driving gear I and the driving rod I, a lower side surface of the driving gear is contacted with the clamping ring I, the driving gear I is fixed on the driving rod I by the nut I, the driving gear II and the driving rod II are provided with key grooves, the key II is arranged in the key groove between the driving gear II and the driving rod II, the lower side surface of the driving gear II is contacted with the clamping ring three-phase, the driving gear II is fixed on the driving rod II by the nut II, and the driving gear I and the driving gear II are meshed with the gear teeth on the top of the piston.
The piston skirt pin seat is drilled with a through hole, the transmission rod I is in clearance fit with the piston skirt pin seat through hole, and the transmission rod II is in clearance fit with the piston skirt pin seat through hole.
The piston skirt is provided with a first limit hole and a second limit hole, a first limit ball, a first limit spring and a first limit bolt are arranged in the first limit hole, the first limit bolt is in threaded connection with the piston skirt, the right end of the first limit spring is in contact with the first limit bolt, the left end of the first limit spring is in contact with the first limit ball, the first limit spring has a certain pretightening force, the first limit ball is in point contact with the wall of the limit groove under the elasticity of the first limit spring, the second limit ball, the second limit spring and the second limit bolt are arranged at the limit Kong Erna, the second limit bolt is in threaded connection with the piston skirt, the left end of the second limit spring is in contact with the second limit bolt, the right end of the second limit spring is in contact with the second limit ball, and the second limit ball is in point contact with the wall of the limit groove under the elasticity of the second limit spring.
The first motor and the second motor synchronously rotate, torque is transmitted to the first driving gear and the second driving gear through the first driving rod and the second driving rod, the first driving gear and the second driving gear drive the piston top to coaxially rotate relative to the piston skirt, the piston top is in threaded connection with the piston skirt, the piston top axially moves relative to the piston skirt while coaxially rotating relative to the piston skirt, and therefore the compression ratio is changed.
Compared with the prior art, the invention has the beneficial effects that:
1. the double-motor type variable compression ratio piston only comprises the piston upper body, the piston lower body and two motors, and has the advantages of less number of parts, simple structure and easy installation.
2. According to the double-motor-driven variable compression ratio piston, the top of the piston is additionally arranged at the bottom of the piston pin seat to drive the piston to move so as to change the compression ratio, so that the reliability is high, and the manufacturability is good.
3. According to the double-motor type variable compression ratio piston, the upper part of the piston is driven by the motor to relatively rotate relative to the piston skirt part, and the motor does not bear axial pressure from the top of the piston, so that the normal operation of the motor is ensured, and the working is reliable.
4. The double-motor type variable compression ratio piston only changes the interior of the piston, thereby avoiding changing the cylinder cover and the crankshaft and reducing the design cost.
5. The double-motor type variable compression ratio piston is provided with a limiting device, and is provided with a sliding limiting groove and a limiting ball, so that the upper part and the lower part of the piston are prevented from being separated.
6. The double-motor type variable compression ratio piston provided by the invention has two motors, and is high in driving power and stable in operation.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a full cross-sectional view of a dual motor variable compression ratio piston assembly in accordance with the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a partial enlarged view at B in FIG. 1;
FIG. 4 is an enlarged view of a portion of FIG. 1 at C;
FIG. 5 is a full cross-sectional view of an assembled view of a dual motor variable compression ratio piston in accordance with the present invention;
FIG. 6 is a front cross-sectional view of the piston crown of the present invention;
FIG. 7 is a bottom view of the top of the piston of the present invention;
FIG. 8 is a full cross-sectional view of a piston skirt of the present invention;
FIG. 9 is a full cross-sectional view of a side view of the piston skirt of the present invention;
FIG. 10 is a top view of the piston skirt of the present invention;
in the figure: 1. the piston top, the piston skirt, the limiting ball, the limiting hole, the limiting spring, the nut, the driving gear, the key, the limiting bolt, the clamping ring, the limiting groove, the bearing, the clamping ring, the transmission rod, the motor comprises a motor I, a limit bolt II, a limit hole II, a limit ball II, a limit spring II, a limit nut II, a key II, a drive gear II, a snap ring III, a snap ring IV, a bearing II, a drive rod II and a motor II.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
as shown in fig. 1, the piston top 1 is connected with the piston skirt 2 through threads, the first motor 15 and the second motor 27 are connected on a pin seat of the piston skirt 2 through bolts, the first transmission rod 14 and the second transmission rod 26 penetrate through holes on the pin seat of the piston skirt 2, the first bearing 12 is embedded in the piston skirt, the first bearing 12 plays a role in supporting the first transmission rod 14, the second bearing 25 plays a role in supporting the second transmission rod 26, the first driving gear 7 is mounted on the first transmission rod 14, the second driving gear 22 is mounted on the second transmission rod 26, and the first driving gear 7 and the second driving gear 22 are meshed with an internal gear ring structure of the piston top 1.
As shown in fig. 1 and 2, a first limit bolt 9, a first limit spring 5 and a first limit ball 3 are arranged in a first limit hole 4, one half of the first limit ball 3 is arranged in a limit groove 11, the other half of the first limit ball is arranged in the first limit hole 4, the first limit spring 5 has a certain pretightening force, the first limit spring 5 applies an elastic force to the first limit ball 3, and the wall surface of the limit groove 11 applies a supporting force to the first limit ball 3 and the elastic force applied to the first limit ball 3 is balanced; the installation modes of the second limit bolt 16, the second limit spring 19 and the second limit ball 18 are identical to the installation modes of the first limit bolt 9, the first limit spring 5 and the first limit ball 3 respectively.
As shown in fig. 1 and 3, the first bearing 12 is embedded in the pin seat of the piston skirt 2 to support the first transmission rod 14, the second clamping ring 13 fixes the first bearing 12 on the pin seat of the piston skirt 2, the first driving gear 7 is arranged on the first transmission rod 14, the first key 8 is arranged between the first driving gear 7 and the first transmission rod 14 to prevent the first driving gear 7 and the first transmission rod 14 from rotating axially, the first clamping ring 10 and the first nut 6 fix the first driving gear 7 on the first transmission rod 14, and the first driving gear 7 is meshed with the top 1 of the piston; the installation modes of the bearing II 25, the transmission rod II 26, the clamping ring III 23, the clamping ring IV 24, the driving gear II 22, the key II 21 and the nut II 20 are identical to the installation modes of the bearing I12, the transmission rod I14, the clamping ring I10, the clamping ring II 13, the driving gear I7, the key I8 and the nut I6 respectively.
As shown in fig. 1, 4 and 5, the pin boss of the piston skirt 2 is square in cross section, and the motor one 15 is fixed on the pin boss of the piston skirt 2 by two bolts, and the mounting manner of the motor two 27 is exactly the same as that of the motor one 15.
As shown in fig. 6 and 7, the piston top 1 has an outer wall and an inner wall, the outer side of the outer wall of the piston top 1 is provided with a piston ring, the inner side of the outer wall of the piston top 1 is provided with threads, the outer side of the inner wall of the piston top 1 is provided with gear teeth, and the inner side of the inner wall of the piston top 1 is provided with a limit groove.
As shown in fig. 8, 9 and 10, the piston skirt 2 is threaded, the piston skirt 2 is in threaded connection with the piston top 1, the piston skirt 2 is provided with a first limiting hole 4 and a second limiting hole 17, the top of the pin seat of the piston skirt 2 is provided with a circular groove for placing the first bearing 12 and the second bearing 25, and the bottom of the pin seat of the piston skirt 2 is provided with a bolt hole for fixing the first motor 15 and the second motor 27.
As shown in fig. 1, when the engine needs a large compression ratio, the first motor 15 and the second motor 27 synchronously rotate, torque is respectively transmitted to the first driving gear 7 and the second driving gear 22 through the first driving rod 14 and the second driving rod 26, the first driving gear 7 and the second driving gear 22 drive the piston top 1 to coaxially rotate relative to the piston skirt 2, the piston top 1 moves upwards relative to the piston skirt 2, the compression ratio is increased, when the piston top 1 moves upwards to a certain distance, the lower end of a limit groove 11 in the piston top 1 contacts a limit ball 3 and a limit ball 18, and at the moment, the piston top 1 cannot continuously move upwards relative to the piston skirt 2, and the compression ratio is maximum; when the engine needs small compression ratio, the motor I15 and the motor II 27 synchronously rotate reversely, the piston top 1 rotates relative to the piston skirt 2, the piston top 1 moves downwards relative to the piston skirt 2, and the compression ratio is small. The cylinder pressure generated by the severe combustion acts on the top end of the piston top 1, and the combustion pressure can not forcedly push the piston top 1 to move relative to the piston skirt 2 due to the self-locking property of the inner screw of the piston top 1, so that the compression ratio of the engine is kept in a constant state; in the process of disassembling the piston top 1 and the piston skirt 2, the first limit bolt 9 and the second limit bolt 16 are disassembled, and the first limit spring 5, the first limit ball 3, the second limit ball 18 and the second limit spring 19 are taken out to finish disassembly.
Claims (2)
1. The double-motor type variable compression ratio piston is characterized by comprising a piston top (1), a piston skirt (2), a first limiting ball (3), a first limiting hole (4), a first limiting spring (5), a first nut (6), a first driving gear (7), a first key (8), a first limiting bolt (9), a first clamping ring (10), a limiting groove (11), a first bearing (12), a second clamping ring (13), a first transmission rod (14), a first motor (15), a second limiting bolt (16), a second limiting hole (17), a second limiting ball (18), a second limiting spring (19), a second nut (20), a second key (21), a second driving gear (22), a third clamping ring (23), a fourth clamping ring (24), a second bearing (25), a second transmission rod (26) and a second motor (27);
the piston skirt (2) is provided with a first limiting hole (4) and a second limiting hole (17), a first limiting ball (3), a first limiting spring (5) and a first limiting bolt (9) are arranged in the first limiting hole (4), the first limiting bolt (9) is in threaded connection with the piston skirt (2), the right end of the first limiting spring (5) is in contact with the first limiting bolt (9), the left end of the first limiting spring (5) is in contact with the first limiting ball (3), the first limiting spring (5) has a certain pretightening force, the first limiting ball (3) is in point contact with the wall of a limiting groove (11) under the elasticity of the first limiting spring (5), the second limiting ball (18), the second limiting spring (19) and the second limiting bolt (16) are arranged in the second limiting hole (18), the second limiting bolt (16) is in threaded connection with the piston skirt (2), the left end of the second limiting spring (19) is in contact with the second limiting bolt (16), the right end of the second limiting spring (19) is in contact with the second limiting ball (18), and the second limiting spring (19) has a certain pretightening force, and the second limiting ball (19) is in contact with the wall of the limiting groove (11);
the motor I (15) is fixed at the bottom of a pin seat of the piston skirt (2) through a bolt, the motor II (27) is fixed at the bottom of the pin seat of the piston skirt (2) through a bolt, the bearing I (12) is embedded at the top end of the pin seat of the piston skirt (2), the bearing I (12) is in transition fit with the transmission rod I (14), the clamping ring II (13) is used for fixing the bearing I (12) on the piston skirt (2), the bearing II (25) is embedded at the top end of the pin seat of the piston skirt (2), the bearing II (25) is in transition fit with the transmission rod II (26), the clamping ring IV (24) is used for fixing the bearing II (25) on the piston skirt (2), the piston top (1) is in threaded connection with the piston skirt (2), the driving gear I (7) is arranged on the transmission rod I (14), and the driving gear II (22) is arranged on the transmission rod II (26);
the driving gear I (7) and the driving rod I (14) are provided with key grooves, the key I (8) is arranged in the key groove between the driving gear I (7) and the driving rod I (14), the lower side surface of the driving gear I (7) is contacted with the clamping ring I (10), the driving gear I (7) is fixed on the driving rod I (14) by the nut I (6), the driving gear II (22) and the driving rod II (26) are provided with key grooves, the key II (21) is arranged in the key groove between the driving gear II (22) and the driving rod II (26), the lower side surface of the driving gear II (22) is contacted with the clamping ring III (23), the driving gear II (22) is fixed on the driving rod II (26), and the driving gear I (7), the driving gear II (22) are meshed with the upper gear teeth of the piston top (1);
the motor I (15) and the motor II (27) synchronously rotate, torque is transmitted to the driving gear I (7) and the driving gear II (22) through the driving rod I (14) and the driving rod II (26), the driving gear I (7) and the driving gear II (22) drive the piston top (1) to coaxially rotate relative to the piston skirt (2), the piston top (1) is in threaded connection with the piston skirt (2), and the piston top (1) axially moves relative to the piston skirt (2) while the piston top (1) coaxially rotates relative to the piston skirt (2), so that the compression ratio is changed.
2. A dual-motor variable compression ratio piston as claimed in claim 1, wherein the piston skirt (2) pin boss is bored with a through hole, the transmission rod one (14) is in clearance fit with the piston skirt (2) pin boss through hole, and the transmission rod two (26) is in clearance fit with the piston skirt (2) pin boss through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711266006.3A CN107956593B (en) | 2017-12-05 | 2017-12-05 | Dual-motor type variable compression ratio piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711266006.3A CN107956593B (en) | 2017-12-05 | 2017-12-05 | Dual-motor type variable compression ratio piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107956593A CN107956593A (en) | 2018-04-24 |
| CN107956593B true CN107956593B (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711266006.3A Active CN107956593B (en) | 2017-12-05 | 2017-12-05 | Dual-motor type variable compression ratio piston |
Country Status (1)
| Country | Link |
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| CN (1) | CN107956593B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102628023B1 (en) * | 2019-10-31 | 2024-01-19 | 삼성중공업 주식회사 | Seperatable piston head |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2029169A (en) * | 1932-06-13 | 1936-01-28 | Hironaka Yasusaburo | Internal combustion engine |
| US4031868A (en) * | 1975-09-10 | 1977-06-28 | Teledyne Industries, Inc. | Variable compression ratio piston |
| US5179916A (en) * | 1990-12-22 | 1993-01-19 | Mtu Motoren- Und Turbinen-Union, Friedrichshafen | Piston with a rotatable piston top |
| CN105370417A (en) * | 2015-12-07 | 2016-03-02 | 吉林大学 | Piston with variable lift compression ratio |
| CN106948966A (en) * | 2017-05-22 | 2017-07-14 | 吉林大学 | A kind of motor-driven variable-compression-ratio piston |
| CN207500011U (en) * | 2017-12-05 | 2018-06-15 | 吉林大学 | A kind of double motor type variable-compression-ratio piston |
-
2017
- 2017-12-05 CN CN201711266006.3A patent/CN107956593B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2029169A (en) * | 1932-06-13 | 1936-01-28 | Hironaka Yasusaburo | Internal combustion engine |
| US4031868A (en) * | 1975-09-10 | 1977-06-28 | Teledyne Industries, Inc. | Variable compression ratio piston |
| US5179916A (en) * | 1990-12-22 | 1993-01-19 | Mtu Motoren- Und Turbinen-Union, Friedrichshafen | Piston with a rotatable piston top |
| CN105370417A (en) * | 2015-12-07 | 2016-03-02 | 吉林大学 | Piston with variable lift compression ratio |
| CN106948966A (en) * | 2017-05-22 | 2017-07-14 | 吉林大学 | A kind of motor-driven variable-compression-ratio piston |
| CN207500011U (en) * | 2017-12-05 | 2018-06-15 | 吉林大学 | A kind of double motor type variable-compression-ratio piston |
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| Publication number | Publication date |
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| CN107956593A (en) | 2018-04-24 |
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