JPH07167073A - Vacuum pump for vehicle - Google Patents

Abstract

PURPOSE:To relieve the load of a vacuum pump even when lubricating oil resides in a gear box and to maintain the functions of an oil pump on the engine side and a lubrication system in a normal state. CONSTITUTION:In addition to a first delivery port 1c through which sucked lubricating oil is discharged to a gear box 7, a second discharge port 1e through which an oil pan 8 and an oil hose are intercommunicated is formed. Even when lubricating oil resides in the gear box 7, sucked lubricating oil is returned directly to the oil pan 8 through the second delivery port 1e.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum pump used for a vacuum booster of a vehicle brake braking device.

[0002]

2. Description of the Related Art Conventionally, a vacuum pump shown in FIG. 2 has been known as a vacuum pump used in a vacuum booster of a vehicle brake braking device. This vacuum pump includes a casing 1 which forms an operating space therein, and a shaft 3 which penetrates the operating space and is rotatably supported by the casing 1 via a bearing 2.
The casing 1 includes: a gear 4 fixed to one end of the shaft 3; a rotor 5 fixed to the central portion of the shaft 3; and a plurality of vanes 6 rotatably held by the rotor 5 in the radial direction. Is an air inlet 1a for sucking air from the vacuum booster, an oil inlet 1b for introducing lubricating oil,
A discharge port 1c for discharging the sucked air and the lubricating oil is provided.

In this vacuum pump, a vacuum pump drive gear housed in an engine gear box 7 and a gear 4 are meshed with each other and mounted on the gear box 7, and driven by the driving force of the engine via the drive gear. It Then, the lubricating oil (engine oil) that lubricates the gears in the gear box 7 is discharged to the oil pan and then pressure-fed from the oil pan by the oil pump in the engine so that the lubricating oil (engine oil) is discharged from the oil introduction port 1b to the discharge port 1c of the vacuum pump. After that, it is configured to be circulated by being discharged to the gear box 7.

[0004]

However, since the oil flow rate into the gear box 7 increases at the time of high rotation in which the pumping flow rate from the oil pump increases, a vacuum pump is particularly attached to the lower portion of the gear box 7. If there is, the lubricating oil will stay near the vacuum pump, and the internal pressure of the vacuum pump will rise, which may cause a high load. Further, when the oil discharge path from the gear box 7 to the oil pan is narrow and oil stays in the gear box 7, the function of the oil pump,
There is also a possibility that the function of each engine lubrication unit may be degraded.

The present invention has been devised in view of the above problems, and can reduce the load on the vacuum pump and maintain the functions of the engine-side oil pump and the lubricating system even when lubricating oil stays in the gearbox. It is an issue to be solved.

[0006]

A vehicle vacuum pump according to the present invention which solves the above-mentioned problems is driven through a gear housed in a gear box for transmitting the driving force of a vehicle engine, and an oil pan is used to remove oil. In a vehicle vacuum pump that introduces the lubricating oil for gear lubrication pumped by a pump and discharges the lubricating oil to the gear box, communicates with the oil pan via a pipe, and sucks the lubricating oil It is characterized by having a discharge port for discharging directly to the oil pan.

[0007]

Since the vacuum pump of the present invention has the discharge port that communicates with the oil pan via the pipe, the introduced lubricating oil can be discharged to both the gear box and the oil pan. As a result, even if the lubricating oil stays in the gear box and becomes difficult to be discharged to the gear box, the lubricating oil is returned directly from the discharge port to the oil pan, so that the load on the vacuum pump is reduced and The functions of the oil pump and the lubrication system of each part of the engine are maintained normally.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional side view showing a vacuum pump according to this embodiment. The vacuum pump of the present embodiment is a vane pump having the same basic structure as the conventional vacuum pump shown in FIG. 2, and common members will be described with the same reference numerals.

This vacuum pump includes a casing 1, a shaft 3 supported by the casing 1 via a bearing 2, a gear 4 fixed to one end of the shaft 3, and a rotor 5 fixed to the central portion of the shaft 3. And a plurality of vanes 6 held by the rotor 5. In addition to the air intake port 1a, the oil introduction port 1b for introducing the lubricating oil, and the first discharge port 1c for discharging the air and the lubricating oil to the gear box 7, the casing 1 is provided with the air and the lubricating oil directly in the oil pan. A second discharge port (discharge port according to the invention) 1d for discharging to 8 is provided. Second outlet 1d
A pipe 1e that connects one end of the oil hose 9 is attached to the.

In the vacuum pump of the present embodiment having the above-mentioned structure, the drive gear for the vacuum pump housed in the gear box 7 of the engine and the gear 4 are meshed with each other and attached to the gear box 7 for use. It The air inlet 1a is connected to the vacuum booster, the oil inlet 1b is connected to the discharge side of the oil pump, and the pipe 1e of the second outlet 1d and the pipe 8a attached to the oil pan 8 are connected to each other. Both ends of the oil hose 9 are connected to each other.

When the vacuum pump is driven through the drive gear by the operation of the engine, the air on the vacuum booster side is sucked from the air suction port 1a and is pumped from the oil pan 8 by the oil pump. Lubricating oil is introduced through the oil introduction port 1b. The sucked air and lubricating oil are discharged through the first discharge port 1c and the second discharge port 1d.
Is discharged to the gear box 7 and the oil pan 8. As a result, the path through which the first discharge port 1c discharges the gear box 7 and returns to the oil pan 8 and the second discharge port 1d.
Two circulation paths, that is, a path from which the oil pan 8 directly returns to the oil pan 8 are formed.

At this time, if the lubricating oil stays in the gear box 7 and is difficult to be discharged from the first discharge port 1c to the gear box 7, the lubricating oil is directly supplied to the oil pan 8 mainly through the second discharge port 1d. Is discharged. Therefore,
Even if the lubricating oil stays near the vacuum pump in the gear box 7, the lubricating oil is discharged from the second discharge port 1d to the oil pan 8, so that the vane 6 of the vacuum pump is not heavily loaded. In addition, even when the lubricating oil stays in the entire gear box 7, the negative pressure of the vacuum pump is used to discharge the lubricating oil from the second discharge port 1d, so that the function of the oil pump on the engine side and other lubricating parts is improved. Is maintained normally.

As described above, since the vacuum pump of this embodiment has the second discharge port 1d for directly discharging the lubricating oil to the oil pan 8, even when the lubricating oil stays in the gear box 7, for example. The load on the vacuum pump can be reduced, and the functions of the oil pump and the lubricating system on the engine side can be normally maintained. In addition, the second provided on the casing 1
The pipe that connects the discharge port 1d and the oil pan 8 is not limited to the oil hose 9 and may be any pipe that connects the two.

Although the above embodiment is an example in which a vane pump is used as the vacuum pump, the present invention can be applied to various other vacuum pumps.

[0015]

Since the vacuum pump of the present invention has a discharge port which communicates with the oil pan through a pipe and discharges the sucked lubricating oil directly to the oil pan, when the lubricating oil stays in the gear box. In addition, the load on the vacuum pump can be reduced, and the functions of the oil pump and the lubricating system on the engine side can be maintained normally.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing a vacuum pump according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional vacuum pump.

[Explanation of symbols]

1 ... Casing 1a ... Air inlet 1b ... Oil inlet 1c ... First outlet 1d ... Second outlet 1e ... Pipe 2 ... Bearing 3 ... Shaft 4 ... Gear 5 ... Rotor 6 ... Vane 7 ... Gear box 8 ... Oil Pan 8a ... Pipe 9 ... Oil hose

Claims (1)

[Claims] 1. Lubricating oil for gear lubrication, which is driven by a gear housed in a gear box for transmitting a driving force of a vehicle engine and is pressure-fed by an oil pump from an oil pan, is introduced, A vehicle vacuum pump that discharges oil to the gear box, characterized by having a discharge port that communicates with the oil pan through a pipe and that directly discharges the sucked lubricating oil to the oil pan. pump.