KR20160146073A

KR20160146073A - Balance shaft module

Info

Publication number: KR20160146073A
Application number: KR1020150082667A
Authority: KR
Inventors: 박영신
Original assignee: (주)동보
Priority date: 2015-06-11
Filing date: 2015-06-11
Publication date: 2016-12-21
Also published as: KR101688786B1

Abstract

The present invention relates to a balance shaft module having one or more balance shafts rotated in conjunction with a crankshaft, the shaft housing including a balance shaft and a plurality of holes formed in a bottom surface thereof; A gear housing disposed adjacent to the shaft housing; A gear assembly which is built in the gear housing and is composed of a plurality of mutually mating gears, one gear meshing with a gear formed on the crankshaft and the other gear meshing with the balance shaft; An oil pump installed in the shaft housing for sucking or discharging oil by rotation of the balance shaft; And a plurality of valve caps selectively fitted in the plurality of holes. According to the balance shaft module of the present invention, the oil in the shaft housing can be smoothly discharged, and external oil can be prevented from flowing back into the shaft housing.

Description

Balance shaft module {Balance shaft module}

The present invention relates to a balance shaft module, and more particularly to a balance shaft module having at least one balance shaft that rotates in conjunction with a crankshaft.

In recent years, engine designs that realize low vibration and low noise have been attracting attention, while consumers are seeking comfortable riding comfort of passenger cars.

As described above, in order to improve the characteristics of the NVH (Noise, Vibration, Harshness) of a passenger vehicle, a balance shaft module for canceling a force generated by an unbalanced inertia of the engine is often applied.

The balance shaft module is composed of two unbalanced shafts rotating at a speed twice as fast as the crank to counteract the vertical force generated in the engine and rotating in opposite directions, and a housing for restricting the engine block and the shaft.

Generally, the balance shaft module shares oil of the engine and supplies oil to the inside of the balance shaft module itself, or lubricates the shaft by using an engine oil pump provided in the engine.

In this case, when the oil pump is built in the balance shaft module as described above, it interferes with the lay-out of a plurality of gears interlocked with each other in the balance shaft module, . &Lt; / RTI >

Accordingly, a balance shaft module is proposed in which the layout of gears and other parts housed in the housing is taken into consideration and the utilization of the space can be increased.

Korean Patent Registration No. 10-1311370 discloses a technique related to the balance shaft module as described above. A first housing having a balance shaft therein and a second housing having gears therein, wherein an oil pump is disposed in the first housing, an oil outlet is formed in a lower surface of the first housing, The oil is discharged from the balance shaft module.

However, in the conventional balanced shaft module, there is a possibility that the external oil flows backward through the oil outlet formed in the first housing. As a result, oil that is filled in the balance shaft module due to oil flowing backward can not be discharged and remains.

In addition, in the manufacture of such a balance shaft module, the components to be mounted are assembled so as to secure a flow path of the oil. In this process, it is difficult to match the components while considering the flow path, There is a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a balance shaft module which is smoothly discharged from the inside of a housing and is easy to match between parts to be mounted.

According to an aspect of the present invention, there is provided a balance shaft module including at least one balance shaft that rotates in conjunction with a crankshaft, the balance shaft module including a shaft having a plurality of holes formed therein, housing; A gear housing disposed adjacent to the shaft housing; A gear assembly which is built in the gear housing and is composed of a plurality of mutually mating gears, one gear meshing with a gear formed on the crankshaft and the other gear meshing with the balance shaft; An oil pump installed in the shaft housing for sucking or discharging oil by rotation of the balance shaft; And a plurality of valve caps selectively fitted in the plurality of holes.

The shaft housing may include a lower housing disposed to surround a lower portion of the balance shaft and having a plurality of holes formed therein and an upper housing coupled to an upper end of the lower housing to surround the upper portion of the balance shaft .

The valve cap is preferably made of a synthetic resin material.

The gear assembly may include an intermediate gear meshing with a gear formed on the crankshaft, and a driven gear engaged with the intermediate gear and engaged with the balance shaft.

The balance shaft module is installed in the gear housing through a center of the intermediate gear and is mounted on a rotary shaft of the intermediate gear and has a flow path whose one end is opened toward the shaft housing, And a fixed shaft extending from a surface of the gear housing facing the shaft housing and having a passage formed therein and engaging with the spindle such that the passage is in contact with a passage formed in the spindle.

Further, the flow path formed on the spindle may be tapered so that the diameter increases toward the shaft housing side.

It is preferable that the fixed shaft has a tapered inclined surface corresponding to the inclination of the oil passage so that the fixed shaft is press-fitted along the inner surface of the tapered oil passage of the spindle.

According to the balance shaft module of the present invention, the following effects can be obtained.

First, an oil hole is formed on the lower surface of the shaft housing, and a valve cap for selectively opening and closing the hole is provided to smoothly discharge the oil in the shaft housing and prevent the oil from flowing back into the shaft housing .

Second, since the end portion of the flow path formed on the spindle and the end portion of the fixed shaft abutting the end portion are tapered, the spindle and the fixed shaft can easily be matched with each other so that the flow path formed on the spindle and the flow path formed on the fixed shaft communicate with each other And it is possible to reduce the uneven wear occurring when the spindle rotates.

1 is a perspective view showing a state in which an upper housing of a balance shaft module according to the present invention is removed,
2 is a schematic plan view schematically showing a state in which a balance shaft module according to the present invention is engaged with a crankshaft,
3 is a cross-sectional view taken along line AA 'of FIG. 2,
4 is a schematic side view schematically showing the configuration of a balance shaft module according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, at the time of the present application, It should be understood that variations can be made.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic plan view schematically showing a state in which a balance shaft module according to the present invention is engaged with a crankshaft K, FIG. 2 is a schematic plan view showing a state where a balance shaft module according to the present invention is engaged with a crankshaft K, FIG. 3 is a cross-sectional view taken along line AA 'of FIG. 2, and FIG. 4 is a schematic side view schematically showing the configuration of a balance shaft module according to the present invention.

1 to 4, the balance shaft module according to the present invention includes at least one balance shaft S that rotates in conjunction with the crankshaft K of the engine to cancel the vibration of the engine. To this end, And includes a housing 100, a gear housing 200, a gear assembly 300, an oil pump 400 and a valve cap 500. Here, the balance shaft S is preferably composed of two shafts rotating in mutually opposite directions, but is not limited thereto.

The shaft housing 100 includes the balance shaft S and a plurality of holes 100h formed on the bottom surface thereof. At this time, the shaft housing 100 may include a lower housing 110 and an upper housing 120, which are vertically disposed, as shown in FIG. First, the lower housing 110 is disposed to surround the lower portion of the balance shaft S, and a plurality of holes 100h may be formed. Here, the plurality of holes 100h may be selectively opened and closed by selectively inserting a valve cap 500 to be described later. In addition, the upper housing 120 may be disposed to engage with the upper end of the lower housing 110 to surround the upper portion of the balance shaft S. At this time, it is preferable that the balance shaft S disposed in the shaft housing 100 is formed such that pump gears are formed on outer diameters thereof, and the pump gears are mutually engaged.

The gear housing 200 is disposed adjacent to the shaft housing 100. At this time, the gear housing 200 preferably incorporates a gear assembly 300 to be described later. Further, as shown in Fig. 2, gears formed on the crankshaft K can be partially inserted.

The gear assembly 300 is comprised of a plurality of gears that are built in the gear housing 200 and mutually mate with each other. One gear meshes with a gear formed on the crankshaft K, To the balance shaft (S). The gear assembly 300 includes an intermediate gear 310 meshing with a gear formed on the crankshaft K and a driven gear 310 meshing with the intermediate gear 310 and engaged with the balance shaft S, And a gear 320.

At this time, the intermediate gear 310 is rotated by the rotation of the crankshaft K, and the driven gear 320 sequentially rotates to rotate the balance shaft S Is rotated.

3, the balance shaft module may further include a spindle 600 installed on the rotation axis of the intermediate gear 310 through the center of the intermediate gear 310. [ At this time, the spindle 600 is preferably formed with a flow passage having one end opened toward the shaft housing side. 3, the spindle 600 supports the rotation of the intermediate gear 310, and an oil passage, which is opened toward the inside of the gear housing 200, is formed, It is preferable to supply the supplied oil to the intermittent gear 310 or a mounted component in the gear housing 200. [ 3, the flow path formed in the spindle 600 may include a tapered inner surface 601 such that the diameter increases toward the shaft housing 100 side.

The balance shaft module may further include a fixed shaft 700 coupled to one end of the spindle 600 and communicating with the flow path. The fixed shaft 700 extends from a surface of the gear housing 200 facing the shaft housing 100 and has a passage formed therein. The passage is in contact with the passage formed in the spindle 600 To the spindle (600). 3, the fixed shaft 700 has a tapered inclined surface 701 corresponding to the inclination of the oil passage so as to be pressed into the end portion along the inner side surface 601 of the tapered oil passage of the spindle 600, ) Is preferably formed.

When the spindle 600 is assembled to the center of the intermediate gear 310, the inclined surface 701 of the fixed shaft 700 slides on the inner surface 601 of the spindle 600, The end of the shaft 700 can be easily press-fitted into the end of the spindle 600. The spindle 600 and the fixed shaft 700 are easily assembled so that the flow path formed in the spindle 600 and the flow path formed in the fixed shaft 700 can be assembled so as to communicate without any deviation, It is possible to reduce the uneven wear that occurs during the rotation of the rotor 600.

The oil pump 400 is built in the shaft housing 100 and sucks or discharges oil by the rotation of the balance shaft S. As shown in FIG. 3, a plurality of pumping gears P are coupled to an outer diameter of the balance shaft S, and the driven gear 320 rotates to rotate the one balance shaft S, And drives the meshing pumping gear P.

The valve cap 500 is selectively inserted into a plurality of holes 100h formed in the lower surface of the shaft housing. It is preferable that the valve cap 500 is securely inserted into the hole 100h when the engine is operated to prevent oil from flowing outside the balance shaft module. Also, when stopping the operation of the engine and discharging the oil filled in the shaft housing 100, it is preferable to separate the oil from the hole 100h and discharge the oil through the hole 100h as shown in FIG. Do. Also, during replacement of the engine oil, the hole 100h and the valve cap 500 may be separated to discharge the oil remaining in the balance shaft module. The valve cap 500 can prevent oil from flowing back into the shaft housing 100 while smoothly discharging oil from the shaft housing 100. Here, the valve cap may have a handle (not shown) formed at one side thereof with a latching protrusion (not shown) extending over the edge of the hole 100h, and a handle (not shown)

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

K: Crankshaft S: Balance shaft
P: Pumping gear 100: Shaft housing
100h: hole 110: lower housing
120: upper housing 200: gear housing
300: gear assembly 310: intermediate gear
320: driven gear 400: oil pump
500: Valve cap 600: Spindle
601: inner side 700: fixed shaft
701:

Claims

A balance shaft module comprising at least one balance shaft that rotates in conjunction with a crankshaft,
A shaft housing incorporating the balance shaft and having a plurality of holes formed in a lower surface thereof;
A gear housing disposed adjacent to the shaft housing;
A gear assembly which is built in the gear housing and is composed of a plurality of mutually mating gears, one gear meshing with a gear formed on the crankshaft and the other gear meshing with the balance shaft;
An oil pump installed in the shaft housing for sucking or discharging oil by rotation of the balance shaft; And
And a plurality of valve caps selectively fitted in the plurality of holes.

The method according to claim 1,
The shaft housing includes:
A lower housing disposed to surround a lower portion of the balance shaft and having a plurality of holes,
And the upper housing balance shaft module is disposed to engage with an upper end of the lower housing to surround an upper portion of the balance shaft.

The method according to claim 1,
Wherein the valve cap is made of a synthetic resin material.

The method according to claim 1,
The gear assembly includes:
An intermediate gear meshing with the gear formed on the crankshaft,
And a driven gear engaged with the intermediate gear and engaged with the balance shaft.

The method of claim 4,
A spindle which is installed on the rotating shaft of the intermediate gear through the center of the intermediate gear and has a flow path formed therein with one end opened toward the shaft housing;
Further comprising a fixed shaft extending from a surface of the gear housing facing the shaft housing and having a flow path formed therein and engaging with the spindle such that the flow path abuts a flow path formed on the spindle.

The method of claim 5,
And the flow path formed on the spindle is tapered so that the diameter increases toward the shaft housing.

The method of claim 6,
Wherein the fixed shaft has a tapered inclined surface corresponding to an inclination of the flow passage so as to be pushed along an inner surface of a tapered flow path of the spindle at an end thereof.