KR100747872B1 - Oil pump of an auto transmission - Google Patents

Abstract

An oil pump of an automatic transmission is provided to prevent cavitation or pulsation and reduce noise and vibration by discharging residual oil through an air chamber to an outlet. A housing(2) includes a pump room, an inlet, and an outlet. A driving gear and a driven gear are mounted into the pump room. The inlet and the outlet of the housing are used for receiving and discharging oil. A cover(4) is used for sealing the pump room. The cover includes a lockup clutch release oil inlet and a lockup clutch release oil outlet. The lockup clutch release oil inlet and the lockup clutch release oil outlet separated from a lockup clutch release flow path. An air chamber is formed at the housing in order to reduce a pulsating effect in an operating process of a lockup clutch and an oil discharging process.

Description

Oil Pump for Automatic Transmission {OIL PUMP OF AN AUTO TRANSMISSION}

1 is an exploded perspective view showing an oil pump for a general automatic transmission;

2 is an internal perspective view of an oil pump for an automatic transmission provided with an air chamber for pulsation reduction according to an embodiment of the present invention.

3 is a front view showing a coupling state of the housing and the cover,

4 is a front view of FIG. 3 with the housing removed;

5 is a front view showing the back of the housing,

6 is a cross-sectional view taken along the section A-A of FIG. 3,

FIG. 7 is a cross-sectional view taken along the section B-B of FIG. 3.

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

2: housing 4: cover

5: drive gear 6: drive hub

7: driven gear 10: oil pump

12: entrance 14: exit

20: air chamber 32: inlet

34: outlet

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump for an automatic transmission of an automobile, and more particularly, by separating a lockup clutch release flow path and securing a pulsation reducing air chamber in a housing in an oil pump during operation of a lockup clutch and at the time of oil discharge. The present invention relates to an oil pump for an automatic transmission that can reduce pulsation generated.

As is well known, the transmission of the vehicle increases or decreases the rotational force of the engine according to the change of the driving condition of the vehicle, and also has a reverse device for reversing the vehicle. It is classified as an automatic transmission in which automatic shifting is performed.

 The automatic transmission is equipped with a hydraulic transmission to automatically drive or release the kick-down sub brake, front and rear clutch, and end clutch according to the driving speed of the vehicle, the load of the engine, and the position of the shift lever.

The hydraulic transmission sends oil pressure generated from the oil pump to the regulator valve, shift, control valve, manual valve, and pressure regulating valve to operate each clutch and brake.

Such a transmission is driven by torque of a torque converter which works together when the engine is driven. The torque converter is coupled to a pump impeller fixed to the crank shaft of the engine and rotates together when the engine is operated, and coupled to the input shaft of the transmission by a spline. It is composed of a turbine disposed opposite the impeller, and a stator positioned between the pump impeller and the turbine to change the flow of oil.

In the above-described torque converter, when the engine starts to operate, the oil pump rotates to circulate oil to supply oil to each part of the automatic transmission. The oil pump is installed at one side of the torque converter in the transmission case. It consists of a structure that works simultaneously with the pump impeller.

That is, as shown in Figure 1, the conventional oil pump 1 is provided with a pump chamber therein, the housing 2, the drive gear and driven gear is seated therein, and the cover 4 for sealing the pump chamber is coupled Will be done.

The inlet and outlet of the oil inlet and outlet are formed in the housing 2 on the opposite side. In this state, the drive gear 5 is driven by a drive hub 6 connected to the impeller of the torque converter. It rotates with the driven gear 7 to pressurize the oil at the inlet to the outlet side.

However, in the section in which the gear teeth 8 of the drive gear 5 and the driven gear 7 are separated, the oil entering through the inlet causes a volume change, which causes cavitation or pulsation to occur. As well as the oil pump is a high pressure generated by the hydraulic control device is unstable, causing a problem that interferes with the smooth running of the vehicle.

In addition, since the pulsation acts as a major problem factor when the lock-up clutch operates, such a pulsation reduction is urgently desired.

The present invention has been made to solve the above problems and desires, the object of which is to generate a pulsation-reducing air chamber in the housing in the oil pump by separating the lock-up clutch release flow path occurs during operation of the lock-up clutch and discharge of oil It is to provide an oil pump of an automatic transmission that can reduce the pulsation phenomenon.

In order to achieve the above object, the present invention provides an oil pump for an automatic transmission, in which a pump chamber is provided, in which a drive gear and a driven gear are mounted, as well as a housing in which an inlet and an outlet through which oil is introduced and discharged are formed, and the pump chamber is sealed. In the oil pump for automatic transmission, which is composed of a combination of a cover, the lock-up clutch is prevented in order to prevent the pulsation phenomenon occurring when the oil is discharged when the lock-up clutch is operated and when no crescent is installed in the oil pump. The lock-up clutch release oil separated from the release flow path is provided with an inlet and an outlet in the cover, characterized in that the air chamber is formed in the housing so as to communicate with the outlet of the cover.

According to the present invention, by separating the lock-up clutch release flow path to create air damping by utilizing the housing in the oil pump to reduce the pulsation during the operation of the lock-up clutch, to secure a space by the air chamber It has a pulsation-reducing effect including bubbles generated in the flow path as a zoom.

DETAILED DESCRIPTION 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. In the drawings, the same components as in the prior art are denoted by the same reference numerals, and detailed description thereof is omitted for convenience.

Figure 2 shows the interior of the oil pump for automatic transmission provided with a pulsation reduction air chamber according to an embodiment of the present invention, Figure 3 shows a coupling state of the housing and the cover, Figure 4 is the housing is removed 5 shows a rear surface of the housing, and FIGS. 6 and 7 are cross-sectional views taken along the section AA and the section BB of FIG. 3, respectively.

As shown, the oil pump for an automatic transmission according to an embodiment of the present invention is an oil pump 10 is not provided with a crescent, the drive gear 5 in the housing 2 of the oil pump as in the prior art The driven gear 7 is seated in an inscribed state. In addition, the housing 2 is provided with an inlet 12 and an outlet 14 to allow the inflow and outflow of oil.

In addition, the oil pump 10 of the present application, as can be seen from Figure 4, when the oil is transferred through the inlet 12 and discharged to the outlet 14, starvation of the drive gear 5 and driven gear 7 Inlet 32 and outlet 34 of the lockup clutch release flow path separated from the lockup clutch release flow path in order to minimize the volume change occurring in the section where the teeth 8 are opened or to minimize the pulsation generated when the lockup clutch is operated. 6 and 7, four air chambers 20 are formed in the housing 2 so as to be in communication with the outlet 34 so that the lock up clutch may be operated or The pulsation phenomenon generated at the time of discharge is reduced.

That is, according to the present invention, when the lock-up clutch operates, the lock-up clutch release oil is air-damped in the space of the air chamber provided in the oil pump to reduce pulsation, including bubbles generated in the flow path, or the drive gear 5 and driven gear The cavitation of the oil generated in the space between (7) is transmitted to the outlet 14 of the housing 2 through the air chamber 20, thereby acting to attenuate noise or vibration.

Looking in more detail the operation of the oil pump for an automatic transmission of the present invention configured as described above are as follows.

First, when the oil pump according to the present invention starts to operate and oil is introduced into the housing 2 through the inlet 12, the oil is transferred through the space between the drive gear 5 and the driven gear 7. Lose.

In this state, the oil transported through the drive gear 5 and the driven gear 7 is changed to the maximum in the space of the highest point where the gap between the gears is maximized, and the volume change of the oil in this space. The cavitation or pulsation phenomenon according to the present invention, in which the volume change of the oil is transmitted to the outlet 14 through the space of the air chamber 20 provided in the housing 2 to prevent the occurrence of such cavitation or pulsation Substantially suppressed.

That is, according to the present invention, a part of the lock-up clutch release flow path is separated to communicate with the air chamber provided in the housing of the oil pump, and configured to be delivered to the outlet 14 through the space of the air chamber 20, thereby operating the lock-up clutch. The generated pulsation reduces the pulsation generated by air damping in the space of the air chamber, and prevents the volume change of oil generated in the space part, so that the hydraulic control device can maintain a stable state even when the oil pump is at high pressure. Will be.

As described above, the oil pump for automatic transmission according to the present invention is formed by providing a space of the air chamber in the housing, which is a pulsation generated during the operation of the lock-up clutch by air damping in the air chamber, and is generated during the oil transfer The excess oil flows through the air chamber to the outlet by the amount of change in volume, thereby preventing cavitation or pulsation and substantially minimizing the generated noise and vibration.

The oil pump for an automatic transmission according to a preferred embodiment of the present invention as described above is not limited to the above embodiment, and the invention without departing from the gist of the present invention as claimed in the following claims. Anyone with ordinary knowledge in this field will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims (2)

In the pump chamber is provided with a drive gear and driven gear seated therein, the inlet and outlet of the oil inlet and outlet is formed, and the oil pump for automatic transmission comprising a combination of a cover for sealing the pump chamber, The inlet and outlet of the lock-up clutch release oil separated from the lock-up clutch release flow path are provided on the cover, and an air chamber is formed in the housing so as to communicate with the outlet. Oil pump for automatic transmission that can reduce the The method of claim 1, The oil pump is an oil pump for an automatic transmission, characterized in that applied when the crescent is not installed.

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