JP2002165401A - Blower motor for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower motor for a vehicle, which can prevent generation of rust in a bearing due to droplets of water infiltrating into the housing. SOLUTION: In this blower motor 1 for vehicle, sometimes water droplets W are sucked in with air by rotating a fan 25 when the outside air is introduced and in the case of dewing. The water droplets W enters a receiving part 2a from an air hole 24 in its opening part side, but a drain hole 2e is provided, under a rotary shaft in the bottom part of the receiving part 2a, so that this water droplet W coming is transmitted along an inner side surface of a yoke 13 and discharged to the outside of the motor from the drain hole 2e.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a blower motor for a vehicle.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional vehicle blower motor 11 provided in a vehicle air conditioner. Motor holder 12
Has a bottomed cylindrical housing portion 12a, and a flange portion 12b extending radially outward below the opening of the housing portion 12a. A cylindrical yoke 13 is fitted on the inner peripheral surface of the housing portion 12a, and a magnet 14 is fixed to the inner peripheral surface of the yoke 13. A bearing recess 12c is formed in the center of the bottom of the housing portion 12a.
The metal bearing 15 is assembled to c. An armature 16 is rotatably housed inside the magnet 14. The base end of the rotating shaft 17 of the armature 16 is rotatably supported by the metal bearing 15. The armature 16 is provided with a commutator 18 on the side of the opening of the housing portion 12a.

A cover 1 is provided at the opening of the housing 12a.
9 is attached. A brush holder 20 is supported on the inner surface of the cover 19 via a floating rubber 21, and the holder 20 holds a brush 22 that slides on the commutator 18. At the center of the cover 19, a metal bearing 23 for rotatably supporting a portion on the tip end side of the rotary shaft 17 is attached. Further, the cover 19 is provided with a plurality of ventilation holes 24 between the cover 19 and the opening of the housing portion 12a in order to enhance heat dissipation in the motor 11. A sirocco-type fan 25 is disposed on the upper surface 12d side of the flange portion 12b, and the fan 25 is integrally rotatably connected to a tip end of the rotary shaft 17 protruding from the cover 19.

[0004] When the fan 25 rotates, air is sucked from the upper portion of the fan 25 to generate an airflow from the outer periphery of the fan 25 to the outside, and the air is sent into the vehicle interior by the airflow.

[0005]

However, when introducing outside air or when dew condensation occurs, water droplets W may be mixed with air in some cases. When such water droplets W adhere to the upper surface 12d of the flange portion 12b, a negative pressure is applied to the central portion (the rotating shaft 17 side) of the rotating fan 25, so that the water droplets W are drawn to the central portion. Depending on the water drop W
Is the side wall 12 of the housing portion 12a above the flange portion 12b.
In some cases, the vehicle may get over the inside of the motor 11 (the inside of the accommodating portion 12a) through the vent hole 24 of the opening portion after getting over e.

Then, the motor interior 11 (the housing 12a
The water droplets W that have entered the inner part) travel along the inner peripheral surface of the yoke 13 and the bottom of the housing part 12a and accumulate at the bottom of the bearing recess 12c, which is the lowest part of the housing part 12a. Metal bearing 15 to be assembled
And the base end of the rotating shaft 17 and the like. If the bearing 15 rusts, there is a possibility that abnormal noise is generated, the rotation shaft 17 becomes difficult to rotate, the loss of driving force increases, and the rotation shaft 17 does not rotate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a vehicle blower motor capable of preventing rust on a bearing portion from being generated by water droplets entering a housing. Is to provide.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a base end of a rotary shaft to which a fan is fixed at a front end is formed at a center of a bottom of a bottomed cylindrical housing. A vehicular air blower motor rotatably supported by bearings disposed in the housing, and having a ventilation hole on the opening side of the housing while rotating the rotation shaft by driving the motor to rotate the fan. Is characterized in that a drain hole is provided below the rotating shaft.

According to a second aspect of the present invention, the base of the rotary shaft to which the fan is fixed at the distal end is rotatably supported by a bearing disposed at the center of the bottom of the bottomed cylindrical housing. A blower motor for a vehicle having a ventilation hole on an opening side of a housing while rotating a rotation shaft by driving to rotate a fan, wherein a drain pipe is provided below the rotation shaft at a bottom of the housing. It is characterized by being provided.

[0010] The invention described in claim 3 is the invention according to claim 1 or 2.
The ventilating motor for a vehicle according to the above, wherein the axis of the drain hole or the drain pipe is provided substantially coaxially with the rotating shaft. According to a fourth aspect of the present invention, in the vehicle blower motor according to the second or third aspect, the drainage pipe is provided vertically below the rotary shaft.

According to the first aspect of the present invention, the vehicle blower motor may draw in water droplets together with air by the rotation of the fan when the outside air is introduced or when dew condensation occurs. The water droplets may enter the housing from the ventilation hole, but since the bottom of the housing has a water drain hole below the rotating shaft,
The infiltrating water droplets travel along the inner surface of the housing and are drained to the outside of the motor from the drain holes. For this reason, it is possible to prevent water droplets from adhering to the bearing portion, and it is possible to prevent generation of rust on the bearing portion.

According to the second aspect of the present invention, the drain pipe is provided below the rotary shaft at the bottom of the housing. Therefore, it is possible to reliably prevent water droplets from adhering to the bearing portion, and further, it is possible to guide the drainage direction by an extension pipe (not shown). Therefore, it is possible to reliably prevent rust from being generated in the bearing portion without water droplets remaining near the bearing portion.

According to the third aspect of the present invention, since the axis of the drain hole or the drain pipe is provided substantially coaxially with the rotating shaft, water droplets do not collect at the corners of the motor housing. Through the tapered part at the bottom of the housing,
Drainage can be reliably performed. According to the fourth aspect of the present invention, since the drainage pipe is provided vertically below the rotary shaft, the drainage can be reliably performed even if the motor is slightly inclined.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. For convenience of explanation, FIG.
The same components as those described above are denoted by the same reference numerals, and the description thereof is partially omitted.

FIG. 1 shows a vehicle blower motor 1 of the present embodiment provided in a vehicle air conditioner. The motor holder 2 constituting the housing includes a cylindrical bottomed housing portion 2a and a flange portion 2b extending radially outward below the opening of the housing portion 2a. A bearing recess 2c is formed at the center of the bottom of the housing 2a, and the metal bearing 1 rotatably supports the base end of the rotating shaft 17 in the bearing recess 2c.
5 are assembled. Below the housing 2a of the motor case, particularly vertically below the rotating shaft 17,
e is provided, and the bearing recess 2c and the drainage pipe 2e are connected by a conical tapered surface 2d.

Here, when introducing outside air or when dew condensation occurs, the water droplets W may be mixed with the air as described above. When such water droplets W adhere to the upper surface 2f of the flange portion 2b, the center side of the rotating fan 25 (the rotating shaft 1).
7) becomes negative pressure, the water W
In some cases, the water droplet W may get over the side wall 2g of the housing portion 2a above the flange portion 2b and enter the inside of the motor 1 (the inside of the housing portion 2a) from the ventilation hole 24 of the opening.

In this embodiment, the inside of the motor 1 (the housing 2
The water droplets W that have entered (a) travel down the inner peripheral surface of the yoke 13 constituting the housing and descend as they are to the tapered housing bottom 2d. Then, the water droplet W is applied to the rotating shaft 17.
And drained from the drain pipe 2e. Therefore, since the water droplets W can be prevented from accumulating in the bearing recess 2c, rusting of the metal bearing 15 and the base end of the rotating shaft 17 and the like is prevented.

As described above, according to the present embodiment,
It has the following effects. (1) Since the vehicle blower motor 1 may draw the water droplets W together with the air by the rotation of the fan 25 when the outside air is introduced or when dew condensation occurs, the ventilation holes 24 on the opening side of the housing 2a.
Although the water droplet W may enter the housing portion 2a from below, in the present embodiment, a drain is provided below the rotating shaft 17 at the bottom of the housing portion 2a, and the water droplet W that has entered the motor case is drained as it is. Therefore, it is possible to prevent water from accumulating in the bearing recess 2c and prevent water droplets W from adhering to the bearing 15 portion, thereby preventing rust from occurring in the bearing 15 portion. Therefore, the rust causes abnormal noise from the bearing 15 portion, the rotation of the rotating shaft 17 becomes difficult, and the loss of the driving force increases.
Can completely be rusted to prevent the rotation shaft 17 from rotating.

(2) Since the groove 2d is formed integrally with the bottom of the housing portion 2a and the groove 2d is used as a water droplet reservoir, the water droplet reservoir can be made easy and inexpensive. (4) The groove 2d is accommodated in the accommodation portion 2.
Since the groove 2d is formed in a rectangular shape along the axial direction of a, the shape of the groove 2d is simplified, and the groove 2d can be formed easily and inexpensively.

Incidentally, the embodiment of the present invention may be modified as follows. In the above embodiment, the drainage pipe is formed integrally below the motor case, but may be provided separately. Alternatively, a drainage pipe may be provided simply by forming an opening without providing a drainage pipe outside the motor case.

In the above embodiment, the metal bearing 15 (slide bearing) is used, but another bearing may be used. For example, a ball bearing may be used.

In the above embodiment, the motor holder 2 is shown in FIG.
However, the present invention is not limited to this. For example, although the housing 2a has a cylindrical shape with a bottom, it may be simply a cylindrical shape with a bottom. Further, a waterproof wall may be further provided upright on the outer peripheral side of the side wall 2g. Further, it is not necessary to particularly provide these waterproof walls.

Although the vehicle blower motor 1 of the above embodiment is a DC motor, it may be a motor other than a DC motor, for example, a brushless motor.

[0024]

As described in detail above, according to the present invention,
It is possible to provide a vehicle blower motor that can prevent rust on a bearing portion from being generated by water droplets that have entered the housing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vehicle blower motor of the present embodiment.

FIG. 2 is a cross-sectional view of a conventional vehicle blower motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ventilation motor for vehicles, 2 ... Motor holder which comprises a housing, 2b ... Flange part, 2g ... Side wall as a waterproof wall, 2d ... Tapered part, 13 ... Yoke which comprises a housing, 15 ... Metal bearing as a bearing, 17 ... rotating shaft, 2
4 ... vent, 25 ... fan.

Claims (4)

[Claims] 1. A base end portion of a rotating shaft to which a fan is fixed at a tip end portion is rotatably supported by a bearing disposed at the center of the bottom of a bottomed cylindrical housing, and the rotating shaft is rotated by driving a motor. A blower motor for a vehicle having a ventilation hole on an opening side of a housing, wherein a drain hole is provided at a bottom of the housing below the rotation shaft. Ventilation motor for vehicles. 2. A base end of a rotating shaft to which a fan is fixed at a tip end is rotatably supported by a bearing disposed at the center of the bottom of a bottomed cylindrical housing, and the rotating shaft is rotated by driving a motor. A blower motor for a vehicle having a ventilation hole on an opening side of a housing while rotating a fan, wherein a drain pipe is provided below the rotation shaft at a bottom of the housing. Ventilation motor for vehicles. 3. The vehicle blower motor according to claim 1, wherein an axis of the drain hole or the drain pipe is provided substantially coaxially with the rotating shaft. Blow motor. 4. The vehicle blower motor according to claim 2, wherein the drainage pipe is provided vertically below the rotary shaft.