CN108343706B

CN108343706B - Balance shaft and engine

Info

Publication number: CN108343706B
Application number: CN201710057043.7A
Authority: CN
Inventors: 魏云腾; 冯贝贝; 胡洪涛
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2017-01-22
Filing date: 2017-01-22
Publication date: 2020-01-31
Anticipated expiration: 2037-01-22
Also published as: CN108343706A

Abstract

The invention provides balance shafts and an engine, wherein each balance shaft comprises an installation shell, two side journals and a balance block, wherein the two side journals are respectively installed at the two axial ends of the installation shell, and the balance block is connected at the radial outer side of the installation shell and is adjustable in radial position relative to the installation shell.

Description

Balance shaft and engine

Technical Field

The invention relates to the technical field of vehicles, in particular to balance shafts and an engine with the same.

Background

The second-order reciprocating inertia force generated by the reciprocating motion of the piston group of the four-cylinder engine is unbalanced due to the particularity of a self-balancing system. In order to reduce engine vibration and noise, a balance shaft needs to be provided. The balance shaft is driven by the crankshaft to rotate. The balance shaft generates centrifugal force due to the fact that the mass center deviates from the rotation center in the rotation process, and the centrifugal force and the second-order reciprocating inertia force of the engine are mutually offset, and therefore vibration and noise of the engine are reduced.

The balance shafts of four-cylinder engines are composed of a front journal, a balance block and a rear journal, wherein the balance amount of the balance block is constant, the balance amount requirement of the series engines can not be met, and the balance shafts can not be generalized.

Disclosure of Invention

In view of the above, the present invention aims to provide kinds of balance shafts to solve the problem of poor versatility of the balance shafts.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

balance shafts comprise an installation shell, two side journals and balance weights, wherein the two side journals are respectively installed at the two axial ends of the installation shell, and the balance weights are connected to the radial outer side of the installation shell and are adjustable in radial position relative to the installation shell.

, the balance shaft further includes a driving member disposed inside the mounting housing, a connecting rod assembly disposed between the driving member and the balance weight, and the driving member drives the balance weight to move radially through the connecting rod assembly.

, the linkage assembly includes a link, a second link and a third link, the link is connected to the counterweight and extends radially, the link passes through a wall of the mounting housing, the third link is connected to the drive shaft of the driver, and the second link is rotatably connected between the link and the third link.

, the mounting shell is provided with a through hole for the connecting rod to pass through, and the vertical distances from the through hole to the two axial ends of the mounting shell are the same.

, the th connecting rod is in clearance fit with the through hole.

, the drive shaft of the drive member extends in the axial direction of the mounting housing, and the third link is perpendicular to the drive shaft.

, the drive shaft and the third link are body forming members.

, the counterweight has an umbrella-shaped cross section.

, the mounting housing is an interference fit with the side journal.

Compared with the prior art, the balance shaft has the following advantages:

according to the balance shaft disclosed by the invention, after the radial position of the balance weight relative to the mounting shell is adjusted, the distance from the balance weight to the center of mass is changed, accordingly, the centrifugal force generated by the balance weight can be changed, and the balance weight of the balance shaft is changed, so that the balance shaft can adapt to different engines by adjusting the position of the balance weight. In addition, the balance shaft can adjust the balance amount of the balance block according to different engine vibrations, so that the engine vibrations can be reduced, and the comfort of the vehicle can be improved.

Another objective of the invention is to propose engines.

an engine including the balance shaft.

The engine and the balance shaft have the same advantages relative to the prior art, and the detailed description is omitted.

Drawings

The accompanying drawings, which form a part hereof , are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, an illustrative embodiment of the invention and the description of the invention for purposes of explanation and not limitation, of the invention, wherein:

fig. 1 is a schematic structural diagram of a balance shaft according to an embodiment of the present invention;

FIG. 2 is an exploded view of a balance shaft according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a fitting relationship of the balance shaft according to the embodiment of the present invention.

Description of reference numerals:

a balance shaft 100;

mounting the housing 10; a through hole 11;

a side journal 20; a balance weight 30;

a drive member 40; a drive shaft 41;

a connecting rod assembly 50, a th connecting rod 51, a second connecting rod 52, a third connecting rod 53;

a pin 60.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The balance shaft 100 according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 3 in conjunction with the embodiment, and the balance shaft 100 is applied to an engine.

As shown in fig. 1 to 3, a balance shaft 100 according to an embodiment of the present invention may include: the housing 10, the side journals 20 and the counterweight 30 are mounted.

As shown in fig. 2, the mounting housing 10 may have a cylindrical structure with a hollow interior, and both ends of the mounting housing 10 in the axial direction may be open. The two side journals 20 are provided, and the two side journals 20 are respectively mounted at both axial ends of the mounting case 10. Preferably, the mounting housing 10 and the two side journals 20 may be interference fit. The interference fit of the side journal 20 and the mounting housing 10 ensures the reliability of the fit therebetween.

The weight 30 is attached to the radially outer side of the mounting case 10, and the radial position of the weight 30 with respect to the mounting case 10 can be adjusted. It will be appreciated that, when the radial position of the balance weight 30 is adjusted relative to the mounting housing 10, the distance from the balance weight 30 to the center of mass will change, and accordingly, the centrifugal force generated by the balance weight 30 may change, and the balance weight of the balance shaft 100 may change, so that the balance shaft 100 may be adapted to different engines by adjusting the position of the balance weight 30. In addition, the balance shaft 100 can adjust the balance amount of the balance weight 30 according to the difference of the engine vibration, so that the engine vibration can be reduced, and the comfort of the vehicle can be improved.

According to preferred embodiments of the present invention, as shown in fig. 2-3, the balance shaft 100 may further include a driving member 40, the driving member 40 is disposed inside the mounting housing 10, a connecting rod assembly 50 is disposed between the driving member 40 and the balance weight 30, and the driving member 40 drives the balance weight 30 to move radially through the connecting rod assembly 50. it should be noted that, since the driving member 40 is disposed inside the mounting housing 10 and the balance weight 30 is disposed radially outside the mounting housing 10, the connecting rod assembly 50 needs to penetrate the wall of the mounting housing 10 without any doubt.

The driving member 40 can be used as a driving member to actively adjust the radial position of the balance shaft 100, so that the radial position of the balance shaft 100 can be more flexibly arranged and is more convenient to change, the vibration of the engine can be better improved, and the engine can be better suitable for different engines.

Alternatively, the driving member 40 may be a driving motor capable of rotating forward and backward, so that the driving motor may drive the balance weight 30 to move in a radial direction away from the mounting case 10 and in a radial direction close to the mounting case 10.

Alternatively , the drive member 40 may be an electromagnetic hydraulic system that controls fluid flow via electromagnetic energy to move the counterweight 30 radially to change the amount of counterweight 30.

further, as shown in FIGS. 2 and 3, the linkage assembly 50 includes a link 51, a second link 52 and a third link 53, the link 51 being connected to the counterweight 30 and the link 51 extending radially such that the link 51 moves the counterweight 30 radially, the link 51 passes through the wall of the mounting housing 10, the third link 53 is connected to the drive shaft 41 of the actuator 40, and the second link 52 is rotatably connected between the link 51 and the third link 53, whereby the drive shaft 41 of the actuator 40 moves the counterweight 30 radially via the third link 53, the second link 52 and the link 51.

As shown in fig. 3, the connecting ends of the second link 52 and the th link 51 may be provided with a pin 60, the pin 60 includes a large-diameter shaft and a small-diameter shaft, the small-diameter shaft penetrates through the ends of the second link 52 and the th link 51, the small-diameter shaft is in interference fit with the end of the th link 51, the small-diameter shaft is in clearance fit with the end of the second link 52, and the large-diameter shaft abuts against the lateral position of the second link 52, so that the second link 52 may rotate relative to the th link 51, and the connection reliability of the th link 51 and the second link 52 is relatively good.

The connecting ends of the second connecting rod 52 and the third connecting rod 53 can be provided with a pin 60, the pin 60 comprises a large-diameter shaft and a small-diameter shaft, the small-diameter shaft penetrates through the end parts of the second connecting rod 52 and the third connecting rod 53, the small-diameter shaft is in interference fit with the end part of the third connecting rod 53, the small-diameter shaft is in clearance fit with the end part of the second connecting rod 52, the large-diameter shaft abuts against the lateral position of the second connecting rod 52, so that the second connecting rod 52 can rotate relative to the third connecting rod 53, and the connection reliability of the third connecting rod 53 and the second connecting rod 52 is good.

Alternatively, as shown in fig. 3, the mounting housing 10 is provided with a through hole 11 for passing the th link 51 therethrough, and the vertical distances from the through hole 11 to both axial ends of the mounting housing 10 may be the same, by providing the through hole 11, the freedom of radial movement of the th link 51 may be ensured, and the through hole 11 may function to guide the th link 51 to move radially to at least degree.

Preferably, as shown in FIG. 3, the th link 51 may be in clearance fit with the through hole 11. the th link 51 and the through hole 11 in clearance fit may prevent the through hole 11 from interfering with the radial movement of the th link 51, thereby making it possible to make the radial movement of the balance weight 30 reliable and accurate.

Alternatively, the driving shaft 41 of the driving member 40 extends along the axial direction of the mounting housing 10, and the third connecting rod 53 is perpendicular to the driving shaft 41. that is, the driving member 40 can rotate to drive the balance weight 30 to move radially, so that the balance shaft 100 can be made reliable in structure and stable in operation.

Preferably, the driving shaft 41 and the third link 53 may be formed by bodies, the bodies of the driving shaft 41 and the third link 53 have simple design and low manufacturing cost, and the assembling process can be reduced, and the assembling efficiency of the balance shaft 100 can be improved.

Alternatively, as shown in FIG. 3, the counterweight 30 is umbrella shaped in cross-section. The weight of the umbrella-shaped balance weight 30 is more concentrated, so that the balance weight of the balance weight 30 can be better changed.

The engine according to the embodiment of the present invention includes the balance shaft 100 of the above embodiment.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1, balance shaft (100), comprising:

a mounting case (10);

two side journals (20), wherein the two side journals (20) are respectively installed at two axial ends of the installation shell (10);

a balance weight (30), wherein the balance weight (30) is connected to the radial outer side of the mounting shell (10) and is adjustable in radial position relative to the mounting shell (10);

the driving piece (40) is arranged inside the mounting shell (10), a connecting rod assembly (50) is arranged between the driving piece (40) and the balance block (30), and the driving piece (40) drives the balance block (30) to move radially through the connecting rod assembly (50);

the link assembly (50) includes a th link (51), a second link (52) and a third link (53), the th link (51) is connected to the balance weight (30) and extends in a radial direction, the th link (51) passes through a wall of the mounting case (10), the third link (53) is connected to a driving shaft (41) of the driving member (40), and the second link (52) is rotatably connected between the th link (51) and the third link (53).

2. The balance shaft (100) according to claim 1, wherein the mounting housing (10) is provided with a through hole (11) for the th connecting rod (51) to pass through, and the vertical distances from the through hole (11) to the two axial ends of the mounting housing (10) are the same.

3. The balance shaft (100) of claim 2 wherein said th link (51) is a clearance fit with said through hole (11).

4. The balance shaft (100) of claim 1 wherein the drive shaft (41) of the drive member (40) extends in an axial direction of the mounting housing (10), the third link (53) being perpendicular to the drive shaft (41).

5. The balance shaft (100) according to claim 4, wherein the drive shaft (41) and the third link (53) are -body formed pieces.

6. The balance shaft (100) of any of claims 1-5, wherein the balance weight (30) is umbrella shaped in cross-section.

7. The balance shaft (100) of any of claims 1-5 wherein the mounting housing (10) is an interference fit with the side journal (20).

An engine of , characterized in that it comprises a balance shaft (100) according to any of of claims 1-7.