JP2559983Y2 - Oil pump support structure - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an oil pump,
More specifically, the oil connected to the torque converter
The present invention relates to a pump support structure.

[0002]

2. Description of the Related Art As is well known, in a fluid coupling used for an automatic transmission of an automobile, an oil pump is provided integrally with a pump impeller, and oil discharged from the oil pump is applied to the fluid coupling.
The operation of the clutch of the provided lock-up mechanism is controlled. Figure 4 shows a torque converter TC in the vicinity of the structure having an oil pump described above,
In the figure, an oil pump A is, for example, a front oil pump using an internal gear type structure. Then, the drive gear B in the oil pump A is adapted to be rotated by engaging the drive hub D of the pump impeller C integrally, specifically, the outer peripheral surface shape and the drive hub D The inner peripheral surface shape of the drive gear B on the side of the oil pump A is a combination of a parallel surface and opposing circular arc surfaces located at both ends of the parallel surface .
It has a shape and is set so that rotation can be stopped by a parallel surface.

On the other hand, a metal bush F is disposed beside an engaging portion between the drive hub D and the drive gear B.
Inside the step formed on the drive gear B on the side opposite to the set side
The seal ring E inserted around the outer periphery of the drive hub D
And between them. The seal ring E is, Torukuko
The oil that sets the pressure when the damper clutch (not shown) of the inverter TC is directly connected is on the inner peripheral side of the drive hub D.
To prevent leakage to a portion other than the damper clutch operating oil passage L formed at the bottom . Further, a metal bush F for supporting the drive hub D while allowing it to rotate is disposed between the drive hub D and the pump body A1 of the oil pump A. For the metal bush F, the drive gear B and the pump body A1
A small amount of high-pressure oil leaking from between is supplied for lubrication.

In general, the pressure on the discharge port side of the oil pump A is higher than that on the suction port side.
Are pressed radially inward. Then, for example, when a high pressure such as a pressure at which the damper clutch is directly connected is required, the discharge pressure from the oil pump A further increases, so that the above-described pressing force also increases. This force is applied to the metal bush F via the drive hub D. However, when the discharge pressure is high, the surface pressure of the metal bush F becomes excessive, which may cause uneven wear and seizure. .

[0005] In order to solve the above problems,
In place of the metal bush, a structure is proposed in which a needle bearing having a structure that does not cause uneven wear is arranged, and the seal ring E is discarded and an oil seal is arranged in the axial side of the needle bearing instead. Have been. That is, in the above-described structure, as shown in FIG. 5, the shaft support portion G provided between the inner peripheral surface of the pump body A1 and the outer peripheral surface of the drive hub D is constituted by the needle bearing H. A ring-shaped oil seal K made of a fluororesin is disposed as a seal portion J on one end face in the axial direction of H, that is, on the end face opposite to the dust seal I in the case of the drawing, so that uneven wear does not occur. The oil leaked from the discharge side of the oil pump A without providing a seal ring in the drive gear B
And the hydraulic oil of the damper clutch is applied to the outer peripheral surface of the drive hub D.
The seal is performed when flowing along .

[0006]

[Problems to be Solved by the Invention] However, in the case where the bearing and the oil seal structure as described above are provided in the same place, the bearing of the drive gear is not provided.
Of the oil from the side of the needle to the needle bearing H
The oil that flows is blocked by the oil seal K.
This oil is used in the drive gear and
Flows into the damper clutch working oil passage through the clearance of the Eve hub
Only depending on the leak pressure and the flow rate , the pressure of the accumulated oil in that range may increase. Therefore, when the pressure of oil accumulated in this range increases, the drive gear
B is located at one axial end surface of this gear, and in FIG.
Pressed against the reaction support indicated by R, reacting
Drive gear facing the wall of the support AR
The sliding surface between the other end of B and the reaction support AR
There is a risk of wear .

An object of the present invention is to prevent wear of a drive gear in an oil pump when a needle bearing and an oil seal are provided at the same position.

[0008]

SUMMARY OF THE INVENTION In order to solve this object, the present invention provides a drive gear which is driven by a drive hub integrally connected to a pump of a fluid coupling, and a pump body which houses the drive gear. An oil pump comprising: a bearing disposed between an outer peripheral surface of the drive hub and an inner peripheral surface of the pump body for rotatably supporting the drive hub; and an oil pump disposed on the fluid coupling side of the bearing. And a communication member that connects the bearing side of the drive gear and the opposite side of the bearing to at least one of the drive hub and the drive gear on the opposite side of the seal member with the bearing interposed therebetween. It is characterized in that a part is formed.

[0009]

According to the present invention, oil leaking from the oil pump by an oil seal are provided side by side with the needle bearing is sealed a high pressure et lest
In addition, the oil is
At least one of the damper clubs
Flow to the side of the oil passage.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of an embodiment of the present invention will be described below with reference to FIGS. 1 to 3, FIG.
The same components as those shown in FIG.
More shown. The present embodiment is characterized in that the needle bearing H and the oil seal K are disposed on the drive gear B accommodated in the oil pump and / or the drive hub D connected to the drive gear B. Oil flow to the damper clutch working oil passage L side
In that a communication section is provided. That is, in the case of this embodiment, a communication portion is provided in both the drive gear B and the drive hub D. In this case, the drive gear B side has an inner periphery of the drive gear B as shown in FIG. In the engaging portion B1 provided on the surface, communication portions B2 are provided at a plurality of positions in the circumferential direction by semicircular grooves formed to penetrate in the axial direction. Drive hub D
On the side, a plurality of semicircular portions are formed at positions corresponding to the communication portion B2 on the drive gear D side in the circumferential direction in the outer peripheral portion corresponding to the shape of the engaging portion B1 formed on the drive gear B or independently. The drain portion D1 constituted by the groove is provided.

Since the present embodiment has the above structure,
Drive gear B and the drive hub D are housed in the oil pump A, as indicated by a broken line in FIG. 3, Dora
Needle bearing H and oil seal of eve gear B
K side and damper clutch operating oil passage L side
Is formed. Therefore, drive gear B
Needle bearing H and oil seal K are arranged from
High pressure oil leaking to the side where
Drive gear on the damper clutch working oil passage side to prevent
Communication parts B2 and D1 of the hub B and the drive hub D (FIG.
2), and the left and right pressures on the side of the drive gear are balanced.

[0012]

As described above, according to the present invention, in the structure in which the oil seal is provided between the drive hub and the pump body, the oil seal is disposed on at least one of the drive hub and the drive gear in the pump. The drive gear and the same place where the oil sump is formed
A communication part is provided to communicate with the other side,
Pressure on the oil sump side increases, and the drive gear
To prevent it from being pushed to the opposite side
it can. Therefore, when the side of the drive gear is pressed,
Drive Gear and Oil Pump Body Sliding Surface Wear
Is eliminated.

[Brief description of the drawings]

1 is a front view of the components used in supporting lifting structure of the oil pump according to the present invention embodiment.

FIG. 2 is a front view of another component used in the support structure shown in FIG.

FIG. 3 is a schematic configuration diagram of a support structure of the oil pump according to the embodiment.

FIG. 4 is a schematic configuration diagram showing a main part of a torque converter having a support structure in a conventional oil pump.

FIG. 5 is a schematic configuration diagram for explaining a structure proposed to solve a problem in the support structure shown in FIG. 4;

[Explanation of symbols]

 A Oil pump A1 Pump body A2 Oil discharge path B Drive gear B1 Engagement part B2 Drain part C Pump impeller D Drive hub D1 Drain part H Needle bearing I Shaft support part J Seal part K Oil seal

Claims (1)

(57) [Scope of request for utility model registration] 1. An oil pump comprising: a drive gear rotatably driven by a drive hub integrally connected to a pump of a fluid coupling; and a pump body accommodating the drive gear. A bearing disposed between the inner peripheral surface of the pump body and rotatably supporting the drive hub; and a seal member disposed on the fluid coupling side of the bearing , the seal sandwiching the bearing. A support structure for an oil pump, wherein a communication portion that connects the bearing side of the drive gear and the opposite side of the bearing is formed on at least one of the drive hub and the drive gear on a side opposite to the member.