阅读说明：本技术 减重曲轴及其发动机 (Weight-reduced crankshaft and engine thereof ) 是由 黄第云 沈捷 于 2020-06-30 设计创作，主要内容包括：本发明公开了一种减重曲轴,涉及发动机,主要解决的是现有曲轴重量大、惯量大,导致发动机运动件的机械效率损失大的技术问题,本发明包括曲轴本体,所述曲轴本体的连杆轴颈内设有第一减重孔,所述曲轴本体的主轴颈内设有第二减重孔,所述曲轴本体的平衡块内设有第三减重孔。本发明还公开了一种应用上述减重曲轴的发动机。本发明通过设置第一减重孔、第二减重孔、第三减重孔,曲轴减重后,惯量较小,运动件旋转惯量大大降低后,发动机的转速可以做得更高,机械效率提高,机油耗减小。(The invention discloses a weight-reducing crankshaft, relates to an engine and mainly solves the technical problem that the mechanical efficiency loss of an engine moving part is large due to the fact that the existing crankshaft is heavy in weight and large in inertia. The invention also discloses an engine using the weight-reduced crankshaft. By arranging the first lightening hole, the second lightening hole and the third lightening hole, after the crankshaft is lightened, the inertia is smaller, after the rotary inertia of a moving part is greatly reduced, the rotating speed of the engine can be higher, the mechanical efficiency is improved, and the oil consumption is reduced.)

1. A weight-reducing crankshaft comprises a crankshaft body (1), and is characterized in that a first weight-reducing hole (3) is formed in a connecting rod journal (2) of the crankshaft body (1), a second weight-reducing hole (5) is formed in a main journal (4) of the crankshaft body (1), and a third weight-reducing hole (7) is formed in a balance block (6) of the crankshaft body (1).

2. A weight-reduced crankshaft according to claim 1, characterized in that the first weight-reduction hole (3) penetrates through both ends of the connecting rod journal (2), and the first weight-reduction hole (3) has a structure with a large middle part and small ends.

3. A weight-reduced crankshaft according to claim 2, characterized in that both ends of the first weight-reduction hole (3) are rounded to the middle by a first circular arc.

4. The weight-reducing crankshaft as claimed in claim 3, characterized in that the maximum diameter of the first weight-reducing hole (3) is less than 0.4-0.5 times of the diameter of the connecting rod journal (2), the radius of the first arc is 3-5 times of the maximum diameter of the first weight-reducing hole (3), the distance from the center line of the middle part of the first weight-reducing hole (3) to the side of the end part of the first weight-reducing hole (3) close to the main journal (4) is 0.2-0.3 times of the maximum diameter of the first weight-reducing hole (3), and the two end ports of the first weight-reducing hole (3) are respectively provided with a first radius (8).

5. A weight-reducing crankshaft according to claim 1, characterized in that the second weight-reducing holes (5) penetrate through both ends of the main journal (4), and the second weight-reducing holes (5) are of a structure with a large middle part and small ends.

6. A weight-reduced crankshaft according to claim 5, characterized in that the two ends of the second weight-reduction hole (5) are rounded to the middle by a second circular arc.

7. The weight-reducing crankshaft as claimed in claim 6, characterized in that the maximum diameter of the second weight-reducing hole (5) is less than 0.4-0.5 times the diameter of the main journal (4), the radius of the second arc is 3-5 times the maximum diameter of the second weight-reducing hole (5), the center line of the second weight-reducing hole (5) coincides with the axial line of the main journal (4), and the two end ports of the second weight-reducing hole (5) are respectively provided with a second radius.

8. The weight-reduced crankshaft as claimed in claim 1, wherein the third lightening holes (7) penetrate through two ends of the balancing weight (6), the third lightening holes (7) are in the structure of circular arc holes, the inner radius of the circular arc holes is larger than the radius of the machined boss of the main journal (4), and the difference of the outer radius minus the inner radius of the circular arc holes is 0.3-0.6 times of the radius minus the inner radius of the balancing weight (6).

9. A weight-reducing crankshaft according to claim 1, characterized in that a reinforcing sleeve is provided in the second weight-reducing hole (5).

10. An engine comprising a reduced weight crankshaft as claimed in any one of claims 1 to 9.

Technical Field

The present invention relates to engines, and more particularly, to a weight-reduced crankshaft and an engine thereof.

Background

The crankshaft is the most important component in the engine. It takes the force from the connecting rod and converts it into torque to be output by the crankshaft and drive other accessories on the engine. The crankshaft is subjected to the combined action of centrifugal force of the rotating mass, gas inertia force of periodic variation and reciprocating inertia force, so that the crankshaft is subjected to the action of bending and twisting load.

The existing crankshaft is generally a solid crankshaft, and has large weight and inertia, so that the mechanical efficiency loss of a moving part of an engine is large, and the oil consumption is also large.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned disadvantages of the prior art, and an object of the present invention is to provide a weight-reduced crankshaft that can reduce loss of mechanical efficiency.

The second purpose of the invention is to provide an engine which can reduce the loss of mechanical efficiency.

In order to achieve the first purpose, the invention provides a weight-reducing crankshaft which comprises a crankshaft body, wherein a first weight-reducing hole is formed in a connecting rod journal of the crankshaft body, a second weight-reducing hole is formed in a main journal of the crankshaft body, and a third weight-reducing hole is formed in a balance block of the crankshaft body.

As a further improvement, the first lightening holes penetrate through two ends of the connecting rod shaft neck, and the first lightening holes are of a structure with a large middle part and small two ends.

Furthermore, two ends of the first lightening hole are smoothly transited to the middle part through a first arc.

Further, the maximum diameter of the first lightening hole is smaller than 0.4-0.5 time of the diameter of the connecting rod journal, the radius of the first arc is 3-5 times of the maximum diameter of the first lightening hole, the distance from the center line of the middle of the first lightening hole to one side, close to the main journal, of the end part of the first lightening hole is 0.2-0.3 time of the maximum diameter of the first lightening hole, and first rounding is respectively arranged at two end ports of the first lightening hole.

Furthermore, the second lightening holes penetrate through two ends of the main journal, and the second lightening holes are of a structure with a large middle part and small two ends.

Furthermore, two ends of the second lightening hole are smoothly transited to the middle part through a second arc.

Further, the maximum diameter of the second lightening hole is smaller than 0.4-0.5 times of the diameter of the main journal, the radius of the second arc is 3-5 times of the maximum diameter of the second lightening hole, the center line of the second lightening hole is overlapped with the axial lead of the main journal, and second rounding circles are respectively arranged at two end ports of the second lightening hole.

Furthermore, the third lightening holes penetrate through two ends of the balance block, each third lightening hole is in an arc hole structure, the inner radius of each arc hole is larger than the radius of the processing boss of the main journal, and the difference between the outer radius and the inner radius of each arc hole is 0.3-0.6 times of the difference between the radius and the inner radius of the balance block.

Further, a reinforcing sleeve is arranged in the second lightening hole.

In order to achieve the second object, the present invention provides an engine including the above weight-reduced crankshaft.

Advantageous effects

Compared with the prior art, the invention has the advantages that: according to the invention, the first lightening hole is arranged on the connecting rod journal, the second lightening hole is arranged on the main journal, and the third lightening hole is arranged on the balance block, so that after the crankshaft is lightened, the inertia is smaller, after the rotary inertia of a moving part is greatly reduced, the rotating speed of the engine can be higher, the mechanical efficiency is improved, and the oil consumption is reduced.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a left side view of the present invention;

FIG. 3 is a schematic perspective view of the present invention;

FIG. 4 is a schematic view of a first lightening hole according to the present invention;

fig. 5 is a schematic structural view of a third lightening hole in the invention.

Wherein: 1-crankshaft body, 2-connecting rod journal, 3-first lightening hole, 4-main journal, 5-second lightening hole, 6-balance block, 7-third lightening hole and 8-first rounding.

Detailed Description

The invention will be further described with reference to specific embodiments shown in the drawings.

Referring to fig. 1-5, a weight-reducing crankshaft comprises a crankshaft body 1, a first weight-reducing hole 3 is arranged in a connecting rod journal 2 of the crankshaft body 1, a second weight-reducing hole 5 is arranged in a main journal 4 of the crankshaft body 1, and a third weight-reducing hole 7 is arranged in a balance weight 6 of the crankshaft body 1.

The first lightening holes 3 penetrate through two ends of the connecting rod journal 2, the first lightening holes 3 are of a structure with a large middle part and small two ends, and two ends of the first lightening holes 3 are smoothly transited to the middle part through the first circular arc, so that the stress uniformity of the connecting rod journal 2 is facilitated. The maximum diameter D1 of the first lightening hole 3 is less than 0.4-0.5 times of the diameter of the connecting rod journal 2, namely D1< 0.4-0.5 times of the diameter of the connecting rod journal 2; the radius R2 of the first circular arc is 3-5 times of the maximum diameter D1 of the first lightening hole 3, namely R2 is 3-5X D1; the distance H from the center line of the middle part of the first lightening hole 3 to one side of the end part of the first lightening hole 3 close to the main journal 4 is 0.2-0.3 times of the maximum diameter D1 of the first lightening hole 3, namely H is 0.2-0.3X D1; the working strength of the connecting rod journal 2 can be ensured and the weight can be sufficiently reduced. The ports at two ends of the first lightening hole 3 are respectively provided with a first radius 8, so that stress concentration can be reduced, and the radius R1 of the first radius 8 is 5-10 mm. The first lightening hole 3 and the axis of the connecting rod journal 2 are eccentrically arranged, and the first lightening hole 3 is positioned on one side far away from the main journal 4, so that the connecting strength between the connecting rod journal 2 and the main journal 4 can be ensured.

The structure of the second lightening hole 5 is similar to that of the first lightening hole 3, the second lightening hole 5 penetrates through two ends of the main journal 4, the second lightening hole 5 is large in the middle and small in the two ends, and the two ends of the second lightening hole 5 are smoothly transited to the middle through a second arc, so that the stress uniformity of the main journal 4 is facilitated. The maximum diameter of the second lightening hole 5 is smaller than 0.4-0.5 time of the diameter of the main journal 4, the radius of the second arc is 3-5 times of the maximum diameter of the second lightening hole 5, the center line of the second lightening hole 5 is overlapped with the axial lead of the main journal 4, second rounding portions are respectively arranged at two end ports of the second lightening hole 5, and the radius of the second rounding portions is 5-10 mm.

The third lightening holes 7 penetrate through two ends of the balance weight 6, the third lightening holes 7 are in an arc hole structure, the inner radius R3 of each arc hole is larger than the radius of a processing boss of the main journal 4, the difference between the outer radius R4 and the inner radius R3 of each arc hole is 0.3-0.6 times of the difference between the radius R0 and the inner radius R3 of the balance weight 6, namely R4-R3 are 0.3-0.6 (R0-R3), the adjustment is specifically required according to the crankshaft balance rate, and the central angle of each arc hole is 100-120 degrees.

The weight-reducing crankshaft is made of cast iron materials, the reinforcing sleeve is arranged in the second weight-reducing hole 5, the rigidity and the strength of the main journal 4 can be enhanced, the punched reinforcing sleeve and the sand core are manufactured during casting, the reinforcing sleeve can be reserved in the second weight-reducing hole 5 during casting, and the reinforcing sleeve can be a steel sleeve.

An engine comprising the weight-reduced crankshaft described above.

The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.