CN212004103U

CN212004103U - Engine and balance shaft thereof

Info

Publication number: CN212004103U
Application number: CN202020639018.7U
Authority: CN
Inventors: 王涛远; 尚丹鸽; 孙晓慧
Original assignee: QINGDAO DESHENG MACHINE MANUFACTURE CO Ltd
Current assignee: QINGDAO DESHENG MACHINE MANUFACTURE CO Ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2020-11-24
Anticipated expiration: 2030-04-24

Abstract

The utility model discloses a balance shaft of engine, including balance shaft body (1), balance shaft body (1) has the axle journal, a serial communication port, the outside level and smooth protrusion in middle part of axle journal (2) forms protruding (3), just height (h) of protruding (3) is not more than the deflection of the inside deformation of axle journal (2) atress. Use the utility model provides a balance shaft, because axle journal (2) middle part of balance shaft body (1) has arch (3), so at engine operation in-process, atress in the middle of axle journal (2) can make axle journal (2) profile inwards concave. The deformation of the inward recess enables the profile of the journal (2) to tend to be straight, so that the journal can be better matched with the bearing bush, and the uniform gap between the whole journal (2) and the bearing bush is ensured, thereby reducing the abrasion between the journal (2) and the bearing bush and prolonging the service life of the bearing bush and the balance shaft. The utility model also discloses an engine of having this balanced axle has above-mentioned technological effect equally.

Description

Engine and balance shaft thereof

Technical Field

The utility model relates to a power machinery technical field, more specifically say, relate to a balance shaft of engine, still relate to an engine.

Background

With the development of industrial technology, automobiles, motorcycles and the like become indispensable tools for human life, leisure and entertainment, engines in the automobiles and the motorcycles play a crucial role, and a balance shaft is a key component in the engine, so that the high quality of the balance shaft can ensure the efficient operation of the engine, and the abrasion condition of a shaft neck and a bearing bush of the balance shaft is crucial to the service life of the engine and the safety of the engine.

Referring to fig. 1-2, fig. 1 is a schematic structural diagram of a conventional balance shaft in the prior art; fig. 2 is an enlarged view of the journal profile of fig. 1. In the prior art, the surface of a shaft neck 2 of a balance shaft body 1 is straight, and when an engine runs, the middle of the shaft neck is stressed, so that the contour of the shaft neck is from straight to concave, the abrasion of a bearing bush is aggravated, and the service life of the bearing bush is shortened.

In summary, how to effectively solve the problems of short service life of the bearing bush caused by serious abrasion between the journal of the balance shaft and the bearing bush is a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the first objective of the present invention is to provide a balance shaft of an engine, which can effectively solve the problem that the shaft neck of the balance shaft and the bearing bush are worn and seriously cause the short service life of the bearing bush.

In order to achieve the first object, the present invention provides the following technical solutions:

the balance shaft of the engine comprises a balance shaft body, wherein the balance shaft body is provided with a shaft neck, the middle part of the shaft neck is outwards and smoothly protruded to form a protrusion, and the height of the protrusion is not more than the deformation of the shaft neck which is inwards deformed under the stress.

Preferably, in the balance shaft of the engine described above, the height of the projection is not more than 0.006 mm.

Preferably, in the balance shaft of the engine, the height of the protrusion ranges from 0.002 mm to 0.006 mm.

Preferably, in the balance shaft of the engine, a surface of the protrusion is curved.

Preferably, in the balance shaft of the engine, the height of the protrusion gradually increases from the left and right side edges to the middle.

Preferably, in the balance shaft of the engine, the projection is symmetrical to the left and right about a center line of the journal.

The utility model provides a balance shaft of engine includes the balance shaft body, and the balance shaft body has the axle journal, and the outside level and smooth protrusion in middle part of axle journal forms protrudingly, and bellied highly is not more than the deflection of the inside deformation of axle journal atress.

Use the utility model provides a balance shaft of engine because the axle journal middle part of balance shaft body has the arch, so at engine operation in-process, atress in the middle of the axle journal can make the axle journal profile inwards concave. The inward-concave deformation enables the profile of the journal to tend to be straight, so that the journal can be better matched with the bearing bush, the uniform gap between the whole journal and the bearing bush is ensured, the abrasion between the journal and the bearing bush is reduced, and the service lives of the bearing bush and the balance shaft are prolonged.

In order to achieve the second object, the present invention further provides an engine including any one of the balance shafts. Since the above-mentioned balance shaft has the above-mentioned technical effects, the engine having the balance shaft should also have corresponding technical effects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of a conventional balance shaft in the prior art;

FIG. 2 is an enlarged view of the journal profile of FIG. 1;

fig. 3 is a schematic structural diagram of a balance shaft according to an embodiment of the present invention;

FIG. 4 is an enlarged view of the journal profile of FIG. 3;

FIG. 5 is a schematic view of the journal after being stressed.

The drawings are numbered as follows:

balance shaft body 1, journal 2, protrusion 3, protruding height h.

Detailed Description

The embodiment of the utility model discloses engine and balance shaft thereof to alleviate the wearing and tearing of axle journal and axle bush, increase of service life.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 3-4, fig. 3 is a schematic structural view of a balance shaft according to an embodiment of the present invention; FIG. 4 is an enlarged view of the journal profile of FIG. 3.

In a specific embodiment, the utility model provides a balance shaft of engine includes balance shaft body 1.

When the engine is in operation, the piston moves very quickly and at a very non-uniform rate. When the piston is located at the upper and lower dead center positions, the speed is zero, but the speed at the middle position of the upper and lower dead center positions is highest. Because the piston makes repeated high-speed linear motion in the cylinder, large inertia force is inevitably generated on the piston, the piston pin and the connecting rod. While the counterweights on the connecting rods can effectively balance these inertial forces, only a portion of the moving mass participates in linear motion and another portion participates in rotation. Therefore, the inertia forces other than the top and bottom dead center positions cannot be completely balanced, and the engine vibrates.

To eliminate such vibration, the arrangement of a balance shaft is added. The balance shaft is a shaft which is provided with an eccentric weight and rotates synchronously with the crankshaft, and the engine obtains good balance effect and reduces the vibration of the engine by utilizing the reverse vibration force generated by the eccentric weight. The balance shaft body 1 is a main structure of the balance shaft, and for a specific structure, reference is made to the arrangement of a conventional balance shaft in the prior art, which is not described herein again. The balance shaft body 1 has a shaft neck, and the present application mainly aims at the shaft neck 2 of the balance shaft body 1, and the abrasion of the shaft neck 2 and a bearing bush is reduced through the structural improvement, so the following description focuses on the structure of the shaft neck 2 of the balance shaft body 1.

The middle of the journal 2 protrudes smoothly outward to form a projection 3. It should be noted that the middle portion herein refers to the middle portion of the journal 2 except for the two ends, and is not limited to the center line. The bulge 3 is formed by the shaft neck 2 protruding outwards smoothly, which means that the contour of the shaft neck 2 with the bulge 3 is smooth overall, and the bulge 3 is not provided with edges and corners. Here and in the following, the outer refers to the radial direction outwards of the journal 2.

The height h of the bulge 3 is not larger than the deformation amount of the journal 2 deformed inwards under force, and the contour of the journal 2 is concave inwards due to the force applied to the middle of the journal 2 in the running process of the engine. Through setting up the height h of protruding 3 and being not more than the deflection of 2 atress inward deformation of axle journal, if in the engine operation process, 2 middle atress of axle journal makes axle journal 2 profile indent 0.003mm, then protruding 3 height h is not more than 0.003mm to in the engine operation process, the height that the axle journal 2 profile indent offsets with protruding 3 height h, makes the profile of axle journal 2 more tend to straight. And the height h of the bulge 3 is not more than the deformation of the journal 2 deformed inwards under stress, so that the problem that the journal 2 still has the bulge 3 to aggravate the abrasion with the bearing bush in the running process of the engine is avoided.

As shown in fig. 5, fig. 5 is a schematic structural view of the journal 2 after being stressed. In fig. 5, the broken line shows the profile of the journal 2 before deformation, the solid line shows the profile after deformation, and the arrows show the force direction. It can be seen that by the provision of the projection 3, the middle of the journal 2 is deformed and straightened during engine operation.

To sum up, use the utility model provides a balance shaft of engine because 2 middle parts of the axle journal of balance shaft body 1 have protruding 3, so in engine operation in-process, 2 middle atress of axle journal can make 2 outlines of axle journal by the indent. The inward-concave deformation enables the profile of the journal 2 to tend to be straight, so that the journal 2 can be better matched with the bearing bush, and the uniform gap between the whole journal 2 and the bearing bush is ensured, so that the abrasion between the journal 2 and the bearing bush is reduced, and the service lives of the bearing bush and the balance shaft are prolonged.

Specifically, the height h of the projection 3 is not more than 0.006 mm. Generally speaking, when the engine runs, the middle of the shaft neck 2 is stressed, so that the height of the inward concave fishtail of the shaft neck 2 is 0.006mm, and therefore, the height h of the protrusion 3 is set to be less than or equal to 0.006mm, and the height of the inward concave fishtail of the shaft neck 2 can be well offset in the running process of the engine.

Preferably, the height h of the protrusion 3 is in the range of 0.002-0.006 mm. Of course, for a certain balance shaft, the height h of the projection 3 of the journal 2 should be a certain value, and the value is within the above numerical range. It should be noted that the height h of the projection 3 refers to the distance between the highest point of the projection 3 and the lowest point of the contour of the journal 2.

In the above embodiments, the surface of the protrusion 3 is curved. The curved surface structure has guaranteed that protruding 3 surfaces do not have edges and corners, has avoided edges and corners and axle bush contact to cause the aggravation of wearing and tearing. And through the curved surface arrangement, stress concentration is avoided, and the deformation of the shaft neck 2 is better adapted in the running process of the engine. The shape of the specific curved surface can be set according to the requirement, such as an arc surface.

Further, the height h of the protrusion 3 gradually increases from the left and right side edges to the middle. Since the journal 2 is stressed at an intermediate position during engine operation, the intermediate corresponding amount of deformation of the journal 2 is large. The height h of the protrusion 3 is gradually increased from the edges of the left side and the right side to the middle, so that the deformation of the journal 2 in the running process of an engine can be better counteracted, namely, the position with the larger middle height counteracts the larger inward concave deformation in the middle of the journal 2, and the positions with the smaller heights of the two sides counteract the smaller inward concave deformation of the journal 2.

Specifically, the projection 3 is bilaterally symmetric about the centerline of the journal 2. I.e. the shape of the projection 3 satisfies bilateral symmetry about the centre line of the journal 2. In the running process of the engine, the middle of the journal 2 is stressed, and the inward concave deformation is generally bilaterally symmetrical about the center line, so that the protrusion 3 is correspondingly arranged into a bilaterally symmetrical structure, the journal 2 is stressed and straightened in the middle of the running process of the engine, the uniform gap between the whole journal and the bearing bush is further ensured, the abrasion between the journal and the bearing bush is reduced, and the service lives of the journal 2 and the bearing bush are prolonged.

Based on the balanced axle that provides in the above-mentioned embodiment, the utility model also provides an engine, this engine includes arbitrary balanced axle in the above-mentioned embodiment. Since the engine adopts the balance shaft in the above embodiment, please refer to the above embodiment for the beneficial effect of the engine.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The balance shaft of the engine comprises a balance shaft body (1), wherein the balance shaft body (1) is provided with a shaft neck, and is characterized in that the middle of the shaft neck (2) protrudes outwards smoothly to form a bulge (3), and the height (h) of the bulge (3) is not greater than the deformation of the shaft neck (2) deformed inwards under stress.

2. The balance shaft of the engine according to claim 1, wherein the height (h) of the protrusion (3) is not more than 0.006 mm.

3. The balance shaft of an engine according to claim 1, wherein the height (h) of the protrusion (3) is in the range of 0.002 to 0.006 mm.

4. Balance shaft for an engine according to any of claims 1-3, characterized in that the surface of the protrusion (3) is curved.

5. The balance shaft of an engine according to claim 4, wherein the height (h) of the protrusion (3) is gradually increased from the left and right side edges to the middle.

6. The balance shaft of an engine according to claim 5, wherein the projection (3) is left-right symmetrical about a centerline of the journal (2).

7. An engine comprising a balance shaft according to any of claims 1 to 6.