CN213478919U

CN213478919U - 20 jar V type engine crankshaft

Info

Publication number: CN213478919U
Application number: CN202021335491.2U
Authority: CN
Inventors: 苏怀林; 张�雄; 蔚兴建; 韦容华; 包毅; 覃星念
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2021-06-18
Anticipated expiration: 2030-07-09

Abstract

The utility model relates to an engine field, in particular to 20 jar V type engine crankshaft, including the crank throw and the main journal of connecting adjacent crank throw, along free end to flywheel end direction projection, follow clockwise according to 72 angles in proper order increase progressively and arrange: the first crank throw, the third crank throw, the fifth crank throw, the second crank throw and the fourth crank throw; the middle transverse section of the main journal between the fifth crank throw and the sixth crank throw is defined as a central plane, the first crank throw and the tenth crank throw, the third crank throw and the eighth crank throw, the fifth crank throw and the sixth crank throw, the second crank throw and the ninth crank throw, and the fourth crank throw and the seventh crank throw are arranged in mirror symmetry with respect to the central plane. The utility model discloses a crank throw arrange the form and the ignition sequence adjustment, reduce bent axle torsional vibration, reduce bent axle front end torsional vibration stress, the torsional vibration is effectual.

Description

20 jar V type engine crankshaft

Technical Field

The utility model relates to an engine field, in particular to 20 jar V type engine crankshaft.

Background

At present, the number of cylinders of a 20-cylinder V-shaped engine is large, 10 crank throws are arranged on a crankshaft of the engine, the crank throw orientation, the ignition sequence and the oil passage arrangement can be divided into a plurality of structures, and the torsional vibration effects of crankshafts with different structures are different. The existing 20-cylinder engine has the defects that the strength of a crankshaft is poor, the torsional vibration amplitude borne by the crankshaft is large, the crankshaft cannot bear large explosion pressure, the strength performance of the crankshaft is poor, the oil supply capacity is poor, an oil passage is difficult to arrange and difficult to process, and the strength of the crankshaft is easily reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a 20 jar V type engine crankshaft, through the arrangement form and the ignition order adjustment of crank throw, reduce bent axle torsional vibration, reduce bent axle front end torsional vibration stress, the torsional vibration is effectual.

A20-cylinder V-shaped engine crankshaft comprises cranks and main journals connected with the adjacent cranks, wherein each crank comprises a connecting rod journal and a crank arm, each main journal and each connecting rod journal are provided with oil ducts, the oil ducts are connected with two oil ports, two ends of the crankshaft are respectively a free end and a flywheel end, and a first crank, a second crank, a third crank, a fourth crank, a fifth crank, a sixth crank, a seventh crank, an eighth crank, a ninth crank and a tenth crank are sequentially arranged from the free end to the flywheel end; similarly, the numbers of the main journals are also sequentially arranged into a first gear to a tenth gear from the free end to the flywheel end, projected along the direction from the free end to the flywheel end, and sequentially arranged in an increasing manner according to an angle of 72 degrees along the clockwise direction: the first bell crank, the third bell crank, the fifth bell crank, the second bell crank and the fourth bell crank; the middle transverse section of the main journal between the fifth crank throw and the sixth crank throw is defined as a central plane, namely the middle transverse section of the main journal of the sixth gear, the first crank throw and the tenth crank throw are arranged in mirror symmetry with respect to the central plane, the third crank throw and the eighth crank throw are arranged in mirror symmetry with respect to the central plane, the fifth crank throw and the sixth crank throw are arranged in mirror symmetry with respect to the central plane, the second crank throw and the ninth crank throw are arranged in mirror symmetry with respect to the central plane, and the fourth crank throw and the seventh crank throw are arranged in mirror symmetry with respect to the central plane; the included angle between the connecting line of the center of one oil port on the connecting rod journal and the circle center of the cross section of the corresponding connecting rod journal and the plane formed by the axis of the connecting rod journal and the axis of the crankshaft is 60-80 degrees. The utility model discloses a reasonable crank throw arrangement form, CAE analysis result show, the torsional vibration of the engine of adopting this bent axle is effectual, has reduced bent axle front end torsional vibration stress, and it is undulant to reduce flywheel end rotational speed, and the engine operates steadily, and shock attenuation and noise reduction are effectual. The oil film thickness of the connecting rod journal can be maintained in a reasonable interval, the lubrication is good, and the reliability is high.

Preferably, when the first crank throw is located at the top dead center position, an included angle between a connecting line of centers of the two oil ports of the main journal of the first gear and the vertical direction is 55-75 degrees, and an included angle between a connecting line of centers of the two oil ports of the main journal of the eleventh gear and the vertical direction is 55-75 degrees. The opening angle of the oil port is obtained according to an axis locus diagram and a bearing load distribution diagram calculated by CAE, and the calculation shows that the lubricating effect is the best in the angle range.

Preferably, when the first crank throw is positioned at the top dead center position, an included angle between a connecting line of centers of the two oil ports of the main journal of the second gear and the vertical direction is-80 to-60 degrees, an included angle between a connecting line of centers of the two oil ports of the main journal of the third gear and the vertical direction is-50 to-30 degrees, and an included angle between a connecting line of centers of the two oil ports of the main journal of the fourth gear and the vertical direction is-20 to 0 degrees. The opening angle of the oil ports, namely the included angle between the connecting line of the centers of the two oil ports of the main journal and the vertical direction, is obtained according to an axis locus diagram and a bearing load distribution diagram calculated by CAE, and the calculation shows that the lubricating effect is the best in the angle range. The opening angle of the oil passage is obtained according to an axis locus diagram and a bearing load distribution diagram calculated by CAE, and the range is as shown in the following table.

Main journal numbering	Range (°)
		First gear	35±10
Second gear	-70±10
		Third gear	-40±10
Fourth gear	-10±10
		Fifth gear	25±10
Seventh gear	50±10
		Eighth gear	5±10
Ninth gear	-25±10
		Tenth gear	-65±10
Eleventh gear	35±10

The outer side of the crank arm is provided with a threaded hole. The screw hole is located and keeps away from one side of connecting rod axle journal, the screw hole be used for installing the balancing piece, the balancing piece is fan-shaped structure, adopts detachable structure installation balancing piece, can select suitable balancing piece according to actual demand, the suitability is stronger.

The utility model has the advantages that:

1. the included angle of the crank throw is reasonably designed, so that the torsional vibration of the crankshaft is reduced, the torsional vibration stress at the front end of the crankshaft is reduced, and the rotation speed fluctuation at the flywheel end is reduced; the torsional vibration effect is good, the balance weight of the balance block can be reduced, and the weight of the engine is reduced.

2. Adopt detachable structure installation balancing piece, can select suitable balancing piece according to actual demand, the suitability is stronger.

3. Through the optimized design of the structures of the oil ducts on the main journal and the connecting rod journal, the inclination angle is optimized, the thickness of an oil film between the crankshaft and the bearing bush can be maintained in a reasonable interval, the lubrication is good, and the reliability is high.

Drawings

Fig. 1 is a schematic structural diagram of a 20-cylinder V-type engine crankshaft according to the present invention.

Fig. 2 is a view of the top view of fig. 1 rotated 90 counterclockwise.

Fig. 3 is a sectional structure view of the oil passage of the connecting rod journal according to the present invention.

Fig. 4 is a sectional view taken along a line a-a in fig. 1.

Fig. 5 is a sectional view taken along line B-B in fig. 1.

Fig. 6 is a sectional view taken along line C-C in fig. 1.

Fig. 7 is a sectional view taken along line D-D in fig. 1.

In the figure: 1-crank, 101-first crank, 102-second crank, 103-third crank, 104-fourth crank, 105-fifth crank, 106-sixth crank, 107-seventh crank, 108-eighth crank, 109-ninth crank, 1010-tenth crank, 2-main journal, 3-free end, 4-flywheel end, 5-crank arm, 501-threaded hole, 6-connecting rod journal and 7-oil channel.

Detailed Description

The invention will be further explained with reference to the drawings and the detailed description below:

example 1:

as shown in fig. 1 to 3, a 20-cylinder V-shaped engine crankshaft comprises crank throws 1 and main journals 2 connecting adjacent crank throws 1, wherein each crank throw 1 comprises a connecting rod journal 6 and a crank arm 5, each main journal 2 and each connecting rod journal 6 are provided with an oil duct 7, the oil ducts 7 are connected with two oil ports, two ends of the crankshaft are respectively a free end 3 and a flywheel end 4, the free end 3 to the flywheel end 4 are sequentially provided with a first crank throw 101, a second crank throw 102, a third crank throw 103, a fourth crank throw 104, a fifth crank throw 105, a sixth crank throw 106, a seventh crank throw 107, an eighth crank throw 108, a ninth crank throw 109 and a tenth crank throw 1010, and projected along the direction from the free end 3 to the flywheel end 4, and sequentially arranged in a clockwise increasing manner according to an angle of 72 degrees: the first bell crank 101, the third bell crank 103, the fifth bell crank 105, the second bell crank 102 and the fourth bell crank 104; the middle transverse section of the main journal 2 between the fifth crank throw 105 and the sixth crank throw 106 is defined as a central plane, i.e., the middle transverse section of the main journal 2 of the sixth gear, i.e., the F-F section shown in fig. 1, the first crank throw 101 and the tenth crank throw 1010 are arranged in mirror symmetry about the central plane, the third crank throw 103 and the eighth crank throw 108 are arranged in mirror symmetry about the central plane, the fifth crank throw 105 and the sixth crank throw 106 are arranged in mirror symmetry about the central plane, the second crank throw 102 and the ninth crank throw 109 are arranged in mirror symmetry about the central plane, and the fourth crank throw 104 and the seventh crank throw 107 are arranged in mirror symmetry about the central plane;

as shown in fig. 3, an angle α, which is 60 °, is formed between a connecting line between the center of one of the oil ports on the connecting rod journal 6 and the center of the cross section of the corresponding connecting rod journal 6 and a plane formed by the axis of the connecting rod journal 6 and the axis of the crankshaft.

Adopt two bent axle assembly on the engine, follow the free end 3 extremely 4 direction projections of flywheel end, the ignition order of engine is: the left side first cylinder, the right side first cylinder, the left side four cylinder, the right side four cylinder, the left side nine cylinder, the right side nine cylinder, the left side six cylinder, the right side six cylinder, the left side eight cylinder, the right side eight cylinder, the left side ten cylinder, the right side ten cylinder, the left side seven cylinder, the right side seven cylinder, the left side two cylinder, the right side two cylinder, the left side five cylinder, the right side five cylinder, the left side three cylinder and the right side three cylinder. The engine is unevenly ignited, the ignition interval angle between two adjacent cylinders is 60 degrees, for example, between the first cylinder on the left and the first cylinder on the right, between the seventh cylinder on the left and the seventh cylinder on the right, and the rest ignition interval angles are 12 degrees, for example, between the first cylinder on the right and the seventh cylinder on the left, and between the 7 th cylinder on the right and the second cylinder on the left, and the crankshaft rotates for two circles for 720 degrees to finish one round of ignition.

Example 2:

this example differs from example 1 only in that: the included angle between the connecting line of the center of one oil port on the connecting rod journal 6 and the circle center of the cross section of the corresponding connecting rod journal 6 and the plane formed by the axis of the connecting rod journal 6 and the axis of the crankshaft is 80 degrees.

The ignition sequence of the engine is: the left side first cylinder, the right side first cylinder, the left side seven cylinder, the right side seven cylinder, the left side two cylinder, the right side two cylinder, the left side six cylinder, the right side six cylinder, the left side three cylinder, the right side three cylinder, the left side ten cylinder, the right side ten cylinder, the left side four cylinder, the right side four cylinder, the left side nine cylinder, the right side nine cylinder, the left side five cylinder, the right side five cylinder, the left side eight cylinder, the right side eight cylinder. The engine is unevenly ignited, and the ignition interval angle between two adjacent cylinders is 60 degrees, such as between a left first cylinder and a right first cylinder, and between a left seventh cylinder and a right seventh cylinder; the rest ignition interval angles are 12 degrees, for example, between the first cylinder on the right and the seventh cylinder on the left and between the 7 th cylinder on the right and the second cylinder on the left, the crankshaft rotates for two circles for 720 degrees to finish one-time ignition.

Example 3:

as shown in fig. 1 to 2, a 20-cylinder V-shaped engine crankshaft comprises crank throws 1 and main journals 2 connecting adjacent crank throws 1, wherein each crank throw 1 comprises a connecting rod journal 6 and a crank arm 5, each main journal 2 and each connecting rod journal 6 are provided with an oil duct 7, the oil ducts 7 are connected with two oil ports, two ends of the crankshaft are respectively a free end 3 and a flywheel end 4, the free end 3 to the flywheel end 4 are sequentially provided with a first crank throw 101, a second crank throw 102, a third crank throw 103, a fourth crank throw 104, a fifth crank throw 105, a sixth crank throw 106, a seventh crank throw 107, an eighth crank throw 108, a ninth crank throw 109 and a tenth crank throw 1010, and projected along the direction from the free end 3 to the flywheel end 4, and sequentially arranged in a clockwise increasing manner according to an angle of 72 degrees: the first bell crank 101, the third bell crank 103, the fifth bell crank 105, the second bell crank 102 and the fourth bell crank 104; the middle transverse section of the main journal 2 between the fifth crank throw 105 and the sixth crank throw 106 is defined as a central plane, that is, the middle transverse section of the main journal 2 of the sixth gear is defined as a central plane, the first crank throw 101 and the tenth crank throw 1010 are arranged in mirror symmetry with respect to the central plane, the third crank throw 103 and the eighth crank throw 108 are arranged in mirror symmetry with respect to the central plane, the fifth crank throw 105 and the sixth crank throw 106 are arranged in mirror symmetry with respect to the central plane, the second crank throw 102 and the ninth crank throw 109 are arranged in mirror symmetry with respect to the central plane, and the fourth crank throw 104 and the seventh crank throw 107 are arranged in mirror symmetry with respect to the central plane.

As shown in fig. 3, an angle α is formed between a connecting line between the center of one of the oil ports on the connecting rod journal 6 and the center of the cross section of the corresponding connecting rod journal 6 and a plane formed by the axis of the connecting rod journal 6 and the axis of the crankshaft, and the angle α is 70 °.

As shown in fig. 4, when the first bell crank 1 is located at the top dead center position, an angle between a connecting line of centers of the two oil ports of the main journal 2 of the first gear and the vertical direction is 55 °, and an angle between a connecting line of centers of the two oil ports of the main journal 2 of the eleventh gear and the vertical direction is 55 °.

As shown in fig. 5, an included angle between a connecting line of centers of the two oil ports of the main journal 2 of the second gear and the vertical direction is an angle β in the drawing, and the size is-80 °.

As shown in fig. 6, an included angle between a connecting line of centers of the two oil ports of the main journal 2 of the third gear and the vertical direction is an angle β in the drawing, and the size is-50 °.

As shown in fig. 7, an included angle between a connecting line of centers of the two oil ports of the main journal 2 of the fourth gear and the vertical direction is an angle β in the drawing, and the size is-20 °.

As shown in fig. 1, a threaded hole 501 is formed in the outer side of the crank arm 5, and is located on the side away from the connecting rod journal, and the threaded hole is used for installing a balance weight, and the balance weight is in a fan-shaped structure.

Example 4:

this embodiment differs from embodiment 3 described above in that: when the first crank throw 1 is positioned at the top dead center position, an included angle between a connecting line of centers of two oil ports of the main journal 2 of the first gear and the vertical direction is 75 degrees, an included angle between a connecting line of centers of two oil ports of the main journal 2 of the eleventh gear and the vertical direction is 75 degrees, an included angle between a connecting line of centers of two oil ports of the main journal 2 of the second gear and the vertical direction is-60 degrees, an included angle between a connecting line of centers of two oil ports of the main journal 2 of the third gear and the vertical direction is-30 degrees, and a connecting line of centers of two oil ports of the main journal 2 of the fourth gear is overlapped with the vertical direction, namely the included angle is 0.

Claims

1. The utility model provides a 20 jar V type engine crankshaft, includes crank throw (1) and main journal (2) of connecting adjacent crank throw (1), crank throw (1) includes connecting rod journal (6) and crank arm (5), every main journal (2) and every all be provided with oil duct (7) on connecting rod journal (6), oil duct (7) are connected with two hydraulic fluid ports, and the both ends of bent axle are free end (3) and flywheel end (4) respectively, free end (3) are equipped with first crank throw (101), second crank throw (102), third crank throw (103), fourth crank throw (104), fifth crank throw (105), sixth crank throw (106), seventh crank throw (107), eighth crank throw (108), ninth crank throw (109), tenth crank throw (1010) in proper order to flywheel end (4), its characterized in that: the projection from the free end (3) to the flywheel end (4) is sequentially arranged in an increasing manner along the clockwise direction according to an angle of 72 degrees: the first bell crank (101), the third bell crank (103), the fifth bell crank (105), the second bell crank (102) and the fourth bell crank (104); an intermediate transverse cross-section of the main journal (2) between the fifth throw (105) and the sixth throw (106) is defined as a central plane, the first throw (101) and the tenth throw (1010) are arranged mirror-symmetrically with respect to the central plane, the third throw (103) and the eighth throw (108) are arranged mirror-symmetrically with respect to the central plane, the fifth throw (105) and the sixth throw (106) are arranged mirror-symmetrically with respect to the central plane, the second throw (102) and the ninth throw (109) are arranged mirror-symmetrically with respect to the central plane, and the fourth throw (104) and the seventh throw (107) are arranged mirror-symmetrically with respect to the central plane; the included angle between the connecting line of the center of one oil port on the connecting rod journal (6) and the circle center of the cross section of the corresponding connecting rod journal (6) and the plane formed by the axis of the connecting rod journal (6) and the axis of the crankshaft is 60-80 degrees.

2. A 20-cylinder V-type engine crankshaft according to claim 1, characterized in that: when the first crank throw (1) is located at the top dead center position, an included angle between a connecting line of centers of the two oil ports of the main journal (2) of the first gear and the vertical direction is 55-75 degrees, and an included angle between a connecting line of centers of the two oil ports of the main journal (2) of the eleventh gear and the vertical direction is 55-75 degrees.

3. A 20-cylinder V-type engine crankshaft according to claim 1 or 2, characterized in that: when the first crank throw (1) is positioned at the top dead center position, an included angle between the connecting line of the centers of the two oil ports of the main journal (2) of the second gear and the vertical direction is-80 to-60 degrees, an included angle between the connecting line of the centers of the two oil ports of the main journal (2) of the third gear and the vertical direction is-50 to-30 degrees, and an included angle between the connecting line of the centers of the two oil ports of the main journal (2) of the fourth gear and the vertical direction is-20 to 0 degrees.

4. A 20-cylinder V-type engine crankshaft according to claim 1 or 2, characterized in that: and a threaded hole (501) is formed in the outer side of the crank arm (5).