JPH0496641A - Pump-integrated motor - Google Patents

Abstract

PURPOSE:To conduct force-feeding of oil through a pump and cooling of a motor simultaneously by housing the motor and pump part in the same case and by causing the oil to pass through the motor part. CONSTITUTION:When power is applied from a commutator 3 to the coil of a rotor 4 via brush 5, a motor part 7 rotates to drive the rotor 13 of a vane pump part 12 on the rotating shaft of the motor part. Then, a vane 14 slides along the inner wall of a case 1 as this rotor 13 rotates to cause oil to flow from an oil inflow port 1a into the case 1 and to pass through the air gap between the rotor 4 of the motor part 7 and a permanent magnet 6 and through the opening of a partition wall 11, and the oil is discharged from an oil outlet port 1b by the vane pump part 12. In this case, because the oil directly returns to the motor part 7, the motor part 7 can be cooled by the oil. Also, because the motor part 7 and the rotor 13 of the vane pump are directly coupled in the same case, the torque can be efficiently transmitted to the vane pump part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pump-integrated motor used in an electro-hydraulic power steering device of a vehicle.

[Conventional technology]

2. Description of the Related Art Conventional electrohydraulic power steering devices use a pump to return oil in a reservoir tank to a power steering mechanism. Such pumps are driven by a motor, and the motor is configured to be cooled by natural air cooling or air cooling by a small fan attached to the motor.

[Problem to be solved by the invention]

However, such conventional electro-hydraulic power steering devices have a drawback in that the motor that drives the pump tends to heat up when the power steering mechanism is frequently used, such as when parking the vehicle in a garage. Conventionally, the motor temperature was detected by a temperature sensor such as a thermistor, and when the temperature exceeded a predetermined temperature, the output level of the motor was lowered to reduce heating of the motor. Therefore, there is a drawback that the power steering mechanism may become unusable under circumstances where it is required.

The present invention was made in view of the problems with the motors used in conventional electro-hydraulic power steering devices, etc., and it is a technology to integrate the motor and the pump so that the motor can be sufficiently cooled. This will be a major issue.

[Means to solve the problem]

The present invention includes a sealed case having an oil inlet and an oil outlet at both ends, a pump installed in the case to guide inflowing oil to the outlet, and a motor connected to the drive shaft of the pump and housed in the case. It is characterized by having the following.

[Effect]

According to the present invention having such characteristics, oil is guided from the inlet to the outlet by the pump by driving the motor in the case. Since oil passes through the case, the motor can be cooled by the oil.

〔Example〕

FIG. 1 is a sectional view showing the configuration of a pump-integrated motor according to an embodiment of the present invention. In this figure, the case 1 has a substantially cylindrical shape, and oil inflow ports 1a and lb are provided on the left and right sides, and bearings 1c and ld that hold the rotating shafts of the motor and pump are provided in a sealed manner in the center. . Now, a commutator 3 and a rotor 4 are attached to the rotating shaft 2 as shown in the figure. As shown in the figure, the rotor 4 has a coil wound around an iron core, and is supplied with power from the commutator 3 via the brush 5. Further, on the inner wall of the case 1 facing the rotor, a permanent magnet 6 is provided in an annular shape as shown in the figure to constitute a motor section 7. Now, in the center of the case l is a partition wall 11 having an opening at the end.
is provided to rotatably hold the central portion of the rotating shaft 2 and to divide the case 1 into a motor section 7 and a vane pump section 12. As shown in a cross-sectional view in FIG. 2, the vane pump section 12 is provided with a cylindrical rotor 13 and a plurality of vanes 14 that slide within notches provided along the circumferential direction of the rotor 13. . The case 1 is configured such that the diameter of the vane pump section increases as shown in the figure, and the amount of protrusion of the vanes 14 is changed by rotation of the rotating shaft 20.

When this pump-integrated motor is used in an electro-hydraulic power steering device, a tank such as a reservoir tank (not shown) is connected to the inlet 1a, and a power steering mechanism is connected to the oil outlet 1b to constantly recirculate the oil. Let them do it.

Next, the operation of this embodiment will be explained. and commutator 3
When the coil of the rotor 4 is energized through the brush 5,
The vane pump section 12 on the rotating shaft of the motor section 7 rotates.
The rotor 13 is driven.

Then, as the rotor 13 rotates, the vanes 14 will slide along the inner wall of the case 1, causing oil to flow into the case 1 from the oil inlet 1a, and the rotor 4 of the motor section 7 and the permanent magnet 6 It passes through the gap between them and the opening in the partition wall 11. The oil is then discharged from the oil outlet ib by the vane pump section 12. In this case, since the oil is directly flowing back into the motor section 7, the motor section 7 can be cooled by the oil. Further, since the motor section 7 and the rotor 13 of the vane pump are directly connected within the same case, rotational force can be efficiently transmitted to the vane pump section 12.

In this embodiment, the pump section connected to the motor section is a vane pump, but it goes without saying that the pump-integrated motor can be constructed using other types of pumps.

[Effects of the Invention] As explained in detail above, according to the present invention, the motor and the pump part are housed in the same case and the oil is passed through the motor part, so that the oil is forced to be pumped by the pump and the motor is cooling can be performed at the same time. Therefore, there is no need to provide the motor itself with a temperature sensor or a mechanism that stops the motor output when the temperature exceeds a predetermined value, and the device can be made smaller and lighter.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a pump-integrated motor according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a vane pump portion thereof. 1・−=−Case l a−−−1 Oil inlet
1b Oil outlet 3-... Commutator 4,130
-Ta 6--Permanent magnet 7--Motor section 11--Partition plate 12-- Vane pump section Vane patent applicant Omron Co., Ltd. agent Patent attorney Yoshiki Okamoto (and 1 others) Fig. 1 --------Ichiju-Sla -------- Oil general population 1b -------- Oil - Minsu mouth 7 -------・Nana-ri-go 12 −・−1−・−Bane “Tsubu Ichi”

Claims (1)

[Claims] (1) A sealed case having an oil inlet and an oil outlet at both ends; a pump provided within the case to guide incoming oil to the outlet; and a pump connected to a drive shaft of the pump and housed within the case. A pump-integrated motor, characterized in that it has a motor.