KR20090064097A - Balance shaft module equipped with oil pump - Google Patents

Abstract

A balance shaft module with an oil pump is provided to prevent aeration in which the air is mixed in the oil because the air included in the oil is exhausted through the second relief flow path. A balance shaft module with an oil pump comprises an inlet port(105), an outlet port(110) and a pump housing(100) with a pumping space formed between the inlet port and outlet port. A relief space(124) is formed between the pumping space and outlet port. In the relief space, a first relief flow path(115) is formed toward the pumping space. In the inner side of the top of the relief space, a second relief flow path(200) opened upwards is formed. In the lateral side of the relief space, a third relief flow path(205) opened outward is formed.

Description

Balance shaft module with oil pump {BALANCE SHAFT MODULE EQUIPPED WITH OIL PUMP}

The present invention relates to a balance shaft module having an oil pump, and a balance shaft module having an oil pump having an improved relief structure.

Balance shaft modules are applied to large four-cylinder or small six-cylinder engines. The balance shaft module may be installed at the top of the crankshaft, or may be installed at the bottom of the crankshaft adjacent to the oil pan at the bottom of the engine.

The balance shaft module is composed of two shafts parallel to each other, one shaft is provided with a drive sprocket. This drive sprocket is connected to the crankshaft by gear or chain.

In addition, the two shafts are connected to each other by gears, which rotate in opposite directions by the gears. An oil pump for pumping oil using the gears is mounted to the balance shaft module.

On the other hand, a relief line is formed in the oil pump provided in the balance shaft module, and has a structure in which oil is returned or discharged to the oil pan through the relief line.

However, since the rotation speed of the oil pump is high, a lot of aeration and cavitation phenomena occur. The cavitation phenomenon further increases when oil having an aeration phenomenon is returned to the oil pump. Therefore, the efficiency of the oil pump may be lowered and the housing or the rotor may be damaged.

The present invention provides a balanced shaft module having an oil pump having improved relief structure and reduced cavitation and aeration.

In the present embodiment, the balance shaft module having an oil pump includes a pump housing having an inlet and an outlet, and a pumping space formed between the inlet and the outlet, and a relief space between the pumping space and the outlet. A first relief flow path is formed from the relief space to the pumping space, and a second relief flow path is formed at an upper end of the relief space to an upper portion of the pump housing, and is opened outwardly from the relief space side. A third relief flow path is formed, and oil and air are discharged through the second relief flow path and the third relief flow path.

In addition, two meshing gears may be disposed in the pumping space, and the gears may rotate to pump oil from the inlet to the outlet.

The gears may also include a first gear mounted to the first balance shaft and a second gear mounted to the second balance shaft and circumscribed with the first gear.

In addition, the movable member is arranged in the relief space and moves in accordance with the pressure of the oil supplied from the pumping space to open and close the first relief flow path, the support member for supporting one side of the movable member and the other of the movable member elastically It may include a supporting spring.

In addition, an oil flow path is formed in the movable member, and the oil supplied from the pumping space may pass through the movable member to move to the second relief passage and the third relief passage.

As described above, according to the embodiment of the present invention, the cavitation and aeration phenomenon by the oil pump is reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

Hereinafter, with reference to the accompanying drawings, a balance shaft module having an oil pump according to an embodiment of the present invention will be described in detail.

2 is a cross-sectional view of a balance shaft module having an oil pump according to an embodiment of the present invention.

Referring to FIG. 2, the balance shaft module having an oil pump includes a pump housing 100.

An inlet 105 through which oil is introduced is formed at the lower right side of the pump housing 100. The oil entering through the inlet 105 enters the pumping space 102 formed in the pump housing 100.

In the pumping space 102, a first gear 120a and a second gear 120b which are external to each other are disposed. The first gear 120a is rotated by a first balance shaft (not shown), and the second gear 120b is rotated by a second balance shaft (not shown).

The oil pumped by the first gear 120a and the second gear 120b is supplied to the components of the engine through the outlet 110 formed at the left side of the pump housing 100.

As shown in FIG. 2, a relief space 124 is formed between the outlet 110 and the pumping space 102. The relief space 124 is provided with a spring 135, a moving member 130 and a support member 125.

The movable member 130 is provided on the supporting member 125, and the spring 135 elastically supports the movable member 130 in the direction of the supporting member 125.

When the pressure of the oil exiting the flow passage 122 in the pumping space 102 is greater than or equal to the reference value, the moving member 130 moves upward while compressing the spring 135.

A first relief flow path 115 is formed between the relief space 124 and the pumping space 102. When the movable member 130 moves upward while compressing the spring 135, oil is returned through the first relief flow path 115.

Therefore, the oil discharged through the outlet 110 has a pressure equal to or less than the set reference value.

In the present embodiment, the relief space 124 further includes a second relief flow path 200 and a third relief flow path 205.

The second relief flow path 200 is formed in an upper direction on an inner upper surface of the relief space 124. Air contained in oil is discharged through the second relief flow path 200. Therefore, it is possible to prevent aeration phenomenon in which air is mixed with oil.

In addition, in the present embodiment, when the first gear 120a and the second gear 120b rotate at a high speed (12000 to 14000 rpm), a cavitation phenomenon may occur, but as described above, in the relief space 124 By forming the second relief flow path 200, the air contained in the oil may be removed to reduce the cavitation phenomenon.

A flow path 210 is formed in the movable member 130 disposed in the relief space 124. The oil may easily move to the first relief flow path 115 and the second relief flow path 200 through the flow path 210.

Referring to FIG. 1, a third relief passage 205 is further formed in the relief space 124. The third relief flow passage 205 is formed in the lateral direction at the inner side of the relief space 124.

The second relief flow path 200 and the third relief flow path 205 are both formed to open to the outside of the pump housing 100. In addition, the oil discharged through the second relief flow path 200 and the third relief flow path 205 may be sprinkled on a separate engine part (for example, a piston).

Although the embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

1 is a cross-sectional view of a balance shaft module having an oil pump according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: pump housing

110: moving member

115: first relief euro

120: gear

125: support member

135: spring

200: second relief euro

205: third relief euro

Claims (6)

In the balance shaft module provided with an oil pump, An inlet and an outlet, the pump housing having a pumping space formed between the inlet and the outlet; A relief space is formed between the pumping space and the outlet, A first relief flow path is formed from the relief space to the pumping space; A second relief flow path is opened at an inner upper end of the relief space to an upper portion of the pump housing; A third relief flow path is opened to the outside in the relief space side, A balance shaft module having an oil pump through which the oil and air are discharged through the second relief channel and the third relief channel. According to claim 1, Two balancing gears are disposed in the pumping space, the balance shaft module having an oil pump for pumping oil from the inlet to the outlet while the gear rotates. The method of claim 2, The gears, A first gear mounted to the first balance shaft; And A second gear mounted to a second balance shaft and external to the first gear; Balanced shaft module having an oil pump comprising a. According to claim 1, A moving member disposed in the relief space to open and close the first relief flow path while moving according to the pressure of oil supplied from the pumping space; A support member for supporting one side of the movable member; And A spring for elastically supporting the other side of the moving member; Balanced shaft module having an oil pump comprising a. The method of claim 4, wherein Balanced shaft module having an oil pump is formed in the moving member flow path for oil flow. The method of claim 4, wherein The balance shaft module having an oil pump to move the oil supplied from the pumping space to the second relief passage and the third relief passage through the moving member.

Images