CN209942938U

CN209942938U - Variable compression ratio piston with built-in speed reduction motor of piston pin

Info

Publication number: CN209942938U
Application number: CN201920459572.4U
Authority: CN
Inventors: 刘茂淳; 王雅菁
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-08
Filing date: 2019-04-08
Publication date: 2020-01-14
Anticipated expiration: 2029-04-08

Abstract

The utility model discloses a variable compression ratio piston with a built-in gear motor of a piston pin, which comprises a piston head, a piston skirt part, a fixing ring, a driven straight gear, a transmission shaft, a driven bevel gear, a driving bevel gear, a piston pin and a motor; the utility model has the beneficial effects that firstly, the utility model adopts JGA20-180B type speed reducing motor to drive, the motor is arranged in the piston pin, and the rotation of the motor around the horizontal axial direction is changed into the translation of the piston head along the axial direction through a group of bevel gears, thereby changing the compression ratio of the engine and improving the economical efficiency and the dynamic property of the engine; secondly, the utility model discloses a gear turns to and the transmission, consequently has the characteristics in the theory of operation is simple and simple to operate, and all driving pieces and driving medium are all installed in the piston simultaneously, consequently external piece influence piston operational environment and then influence piston work efficiency can not appear.

Description

Variable compression ratio piston with built-in speed reduction motor of piston pin

Technical Field

The utility model relates to the technical field of engines, especially, relate to a piston pin embeds gear motor's variable compression ratio piston.

Background

Variable Compression Ratio (Variable Compression Ratio) is a technique for dynamically adjusting the Compression Ratio of an internal combustion engine. Variable compression ratio may improve fuel efficiency under different load conditions. A lower compression ratio is required at high loads, while a high compression ratio is required at low loads. The purpose of the variable compression ratio is to improve the fuel economy of a supercharged engine. In supercharged engines, the compression ratio is lower than in naturally aspirated engines in order to prevent knocking. The thermal efficiency is reduced when the boost pressure is low, which reduces fuel economy. Especially in turbocharged engines, the torque rises very slowly at low compression ratios due to the slow rise in boost. That is, at low engine speeds, the supercharging effect is delayed until the engine accelerates to a certain speed before the supercharging system is effective. To solve this problem, a variable compression ratio is an important method. That is, at a low load condition where the supercharging pressure is low, the compression ratio is raised to the same or more than the compression ratio of the naturally aspirated engine: on the other hand, the compression ratio is appropriately reduced under a high-load condition of high supercharging. In other words, the compression ratio is continuously adjusted as the load changes so that the thermal efficiency can be improved over the entire operating range from low load to high.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

The utility model discloses the technical problem who needs to solve lies in, provides a piston pin built-in gear motor's variable compression ratio piston, thereby can realize that the piston head height realizes variable compression ratio, improves the economic nature and the dynamic property of engine.

2. Technical scheme

In order to realize the purpose, the technical scheme of the utility model is that: a variable compression ratio piston with a built-in speed reducing motor for a piston pin comprises a piston head, a piston skirt, a fixing ring, a driven straight gear, a transmission shaft, a driven bevel gear, a driving bevel gear, a piston pin and a motor; the piston head is sleeved on the upper part of the piston skirt, two key grooves are symmetrically formed in the inner side of the piston head, and two keys matched with the key grooves are symmetrically formed in the inner side of the piston skirt; the fixing ring is a conical ring and is fixedly installed in the center of the top surface of the piston skirt part through a bolt; the lower part of the driven ring is a conical ring, the upper part of the driven ring is a circular ring, and an inner ring of the circular ring is provided with an internal thread; the driven ring is sleeved on the bolt, is positioned between the fixed ring and the piston skirt part, and can rotate around the axis of the driven ring; the driven ring is connected with the piston head through threads; the driven straight gear is connected with the driven bevel gear through a transmission shaft, the piston pin is sleeved on the lower portion of the piston skirt portion, the motor is installed in the piston pin, and the driving bevel gear is installed on the motor output shaft and meshed with the driven bevel gear.

In the variable compression ratio piston of the speed reducing motor with the built-in piston pin, a plurality of mounting holes are uniformly formed in the lower part of the driven ring along the circumferential direction, and steel balls are mounted in the mounting holes; and the bottom surface of the fixing ring and the top surface of the piston skirt are respectively provided with a sliding chute matched with the steel ball.

The piston pin is internally provided with the variable compression ratio piston of the speed reducing motor, wherein the top surface of the skirt part of the piston is provided with a through hole matched with the transmission shaft; and the lower part of the driven ring is provided with a circular through hole matched with the transmission shaft.

The piston pin is internally provided with the variable compression ratio piston of the speed reducing motor, wherein the end part of the piston pin is provided with a groove matched with the transmission shaft.

The piston pin is internally provided with a partition plate which divides an inner cavity of the piston pin into a mounting cavity and a transmission cavity; the motor is installed in the installation cavity, and a motor output shaft penetrates through the partition plate to be connected with the driving bevel gear located in the transmission cavity.

The variable compression ratio piston of the speed reducing motor with the built-in piston pin is characterized in that a wire bundle hole is formed in the bottom of the mounting cavity.

In the above variable compression ratio piston of the speed reducing motor with the built-in piston pin, the lower part of the transmission shaft extends radially outwards to form a limiting part, and the top surface of the limiting part is in contact with the inner wall of the transmission cavity.

The piston pin is internally provided with the variable compression ratio piston of the speed reducing motor, wherein the motor is a JGA20-180B type speed reducing motor.

3. To sum up the above

To sum up, the beneficial effects of the utility model reside in that:

(1) the utility model adopts JGA20-180B type speed reducing motor to drive, the motor is arranged in the piston pin, the rotation of the motor around the horizontal axial direction is changed into the translation of the piston head along the axial direction through a group of bevel gears, thereby changing the compression ratio of the engine and improving the economy and the dynamic property of the engine;

(2) the utility model discloses a gear turns to and the transmission, consequently has the characteristics in the theory of operation is simple and simple to operate, and all driving pieces and driving medium are all installed in the piston simultaneously, consequently external piece influence piston operational environment and then influence piston work efficiency can not appear.

Drawings

Fig. 1 is a side sectional view of a variable compression ratio piston of a speed reduction motor built in a piston pin according to the present invention.

Fig. 2 is a front sectional view of the variable compression ratio piston of the speed reduction motor built in the piston pin of the present invention.

Fig. 3 is an explosion structure diagram of the variable compression ratio piston of the speed reducing motor built in the piston pin of the invention.

Fig. 4 is a schematic structural view of a variable compression ratio piston head of the speed reduction motor built in the piston pin according to the present invention.

Fig. 5 is a schematic structural view of the variable compression ratio piston driven ring of the speed reducing motor with the built-in piston pin according to the present invention.

Fig. 6 is a schematic structural view of the variable compression ratio piston pin of the speed reduction motor built in the piston pin according to the present invention.

Detailed Description

The embodiments of the present invention will be further explained with reference to the drawings.

Referring to fig. 1 to 6, a variable compression ratio piston of a speed reduction motor with a built-in piston pin comprises a piston head 1, a piston skirt 2, a fixing ring 3, a driven ring 4, a driven straight gear 5, a transmission shaft 6, a driven bevel gear 7, a driving bevel gear 8, a piston pin 9 and a motor 10; the piston head 1 is sleeved on the upper part of the piston skirt 2, two key grooves 101 are symmetrically formed in the inner side of the piston head 1, and two keys 102 matched with the key grooves 101 are symmetrically formed in the inner side of the piston skirt 2; the fixing ring 3 is a conical ring and is fixedly arranged in the center of the top surface of the piston skirt part 2 through a bolt 11; the lower part of the driven ring 4 is a conical ring, the upper part of the driven ring is a circular ring, and an inner ring of the circular ring is provided with an internal thread 401; the driven ring 4 is sleeved on the bolt 11, is positioned between the fixed ring 3 and the piston skirt 2, and can rotate around the axis of the driven ring; the driven ring 4 is connected with the piston head 1 through threads; driven straight gear 5 passes through transmission shaft 6 with driven bevel gear 7 and is connected, piston pin 9 suit is in 2 lower parts of piston skirt portion, the motor 10 is installed in piston pin 9, initiative bevel gear 8 is installed on the motor output shaft 10, and with driven bevel gear 7 meshes.

A plurality of mounting holes 402 are uniformly formed in the lower part of the driven ring 4 along the circumferential direction, and steel balls 12 are mounted in the mounting holes 402; the bottom surface of the fixing ring 3 and the top surface of the piston skirt 2 are respectively provided with a sliding groove 13 matched with the steel ball 12, and the steel ball 12 is used for reducing the resistance of the driven ring 4 during rotation.

The top surface of the piston skirt part 2 is provided with a through hole 201 matched with the transmission shaft 6; the lower part of the driven ring 4 is provided with an annular through hole 403 matched with the transmission shaft 6, the end part of the piston pin 9 is provided with a groove 901 matched with the transmission shaft 6, and the transmission shaft 6 respectively penetrates through the groove 901, the annular through hole 403 and the through hole 201 to be connected with the driven bevel gear 7 and the driven straight gear 5.

A partition 902 is arranged in the piston pin 9 and divides the inner cavity of the piston pin 9 into a mounting cavity 100 and a transmission cavity 200; the motor 10 is installed in the installation cavity 100, and the output shaft of the motor 10 passes through the partition 902 to be connected with the drive bevel gear 8 in the transmission cavity 200.

A wire harness hole 903 is formed in the bottom of the installation cavity 100, and a control wire harness of the motor 10 enters the installation cavity 100 through the wire harness hole 903 and is fixed through a clamp spring through the control wire harness.

The lower part of the transmission shaft 6 extends outwards in the radial direction to form a limiting part 601, the top surface of the limiting part 601 is in contact with the inner wall of the transmission cavity 200, and the limiting part 601 is used for limiting the axial freedom degree of the transmission shaft 6 and preventing the transmission shaft from moving in the axial direction.

The motor 10 is a JGA20-180B type speed reduction motor.

The using method comprises the following steps: when the motor operates, torque is transmitted to the driven ring 4 through the driving bevel gear 8, the driven bevel gear 7, the transmission shaft 6 and the driven straight gear 5, so that the driven ring 4 axially rotates along the piston skirt 2, and at the moment, the resistance of rotation of the driven ring 4 is small due to the action of the steel balls 12. When the driven ring 4 rotates, the threads matched with the outer side of the driven ring and the inner side of the piston head 1 enable the piston head 1 to move axially relative to the piston skirt 2, so that the overall height of the piston is changed, and the compression ratio of the engine is changed. When the engine is in a small load, the motor 10 rotates positively to drive the piston head 1 to move upwards relative to the fixed ring 3 and the piston skirt 2, so that the overall height of the piston is increased, and the compression ratio is increased; when the engine is under a large load, the motor 10 rotates reversely to drive the piston head 1 to move downwards relative to the fixed ring 3 and the piston skirt 2, the overall height of the piston is reduced, and the compression ratio is reduced.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the content of the present invention or the direct or indirect application attached to the technical field of other related products are included in the patent protection scope of the present invention.

Claims

1. The variable compression ratio piston of the speed reducing motor with the built-in piston pin is characterized in that: the piston comprises a piston head (1), a piston skirt (2), a fixing ring (3), a driven ring (4), a driven straight gear (5), a transmission shaft (6), a driven bevel gear (7), a driving bevel gear (8), a piston pin (9) and a motor (10); the piston head (1) is sleeved on the upper part of the piston skirt part (2), two key grooves (101) are symmetrically formed in the inner side of the piston head (1), and two keys (102) matched with the key grooves (101) are symmetrically formed in the inner side of the piston skirt part (2); the fixing ring (3) is a conical ring and is fixedly arranged in the center of the top surface of the piston skirt part (2) through a bolt (11); the lower part of the driven ring (4) is a conical ring, the upper part of the driven ring is a circular ring, and an inner ring of the circular ring is provided with an internal thread (401); the driven ring (4) is sleeved on the bolt (11), is positioned between the fixed ring (3) and the piston skirt part (2), and can rotate around the axis of the driven ring; the driven ring (4) is connected with the piston head (1) through threads; driven straight gear (5) are connected through transmission shaft (6) with driven bevel gear (7), piston pin (9) suit is in piston skirt portion (2) lower part, install motor (10) in piston pin (9), install initiative bevel gear (8) on the output shaft of motor (10), and with driven bevel gear (7) meshing.

2. The variable compression ratio piston of a reduction motor with a built-in piston pin according to claim 1, wherein: a plurality of mounting holes (402) are uniformly formed in the lower part of the driven ring (4) along the circumferential direction, and steel balls (12) are mounted in the mounting holes (402); and the bottom surface of the fixing ring (3) and the top surface of the piston skirt part (2) are respectively provided with a sliding chute (13) matched with the steel ball (12).

3. The variable compression ratio piston of a reduction motor with a built-in piston pin according to claim 1, wherein: the top surface of the piston skirt part (2) is provided with a through hole (201) matched with the transmission shaft (6); and a circular through hole (403) matched with the transmission shaft (6) is formed in the lower part of the driven ring (4).

4. The variable compression ratio piston of a reduction motor with a built-in piston pin according to claim 1, wherein: the end part of the piston pin (9) is provided with a groove (901) matched with the transmission shaft (6).

5. The variable compression ratio piston of a reduction motor with a built-in piston pin according to claim 1, wherein: a partition plate (902) is arranged in the piston pin (9) and divides the inner cavity of the piston pin (9) into a mounting cavity (100) and a transmission cavity (200); the motor (10) is installed in the installation cavity (100), and an output shaft of the motor (10) penetrates through the partition plate (902) to be connected with a driving bevel gear (8) located in the transmission cavity (200).

6. The variable compression ratio piston of a reduction motor with a built-in piston pin according to claim 5, wherein: the bottom of the mounting cavity (100) is provided with a wire harness hole (903).

7. The variable compression ratio piston of a reduction motor with a built-in piston pin according to claim 5, wherein: the lower part of the transmission shaft (6) extends outwards along the radial direction to form a limiting part (601), and the top surface of the limiting part (601) is in contact with the inner wall of the transmission cavity (200).

8. The variable compression ratio piston of a reduction motor with a built-in piston pin according to claim 1, wherein: the motor (10) is a JGA20-180B type speed reducing motor.