JPH0644288Y2 - Bearing holding structure for motor side plates - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a bearing holding structure for a motor side plate having a circuit pattern on one surface.

(Prior Art) A motor having a motor side plate in which a motor control circuit is integrally formed on one surface is known in order to reduce the size and thickness of the motor. As the motor side plate, phenol or glass is used. A printed wiring board with a synthetic resin such as epoxy as the core or a metal core printed wiring board with a metal as the core, such as an iron plate, is mainly used, but as a side plate that has the advantages of both these printed wiring boards, A metal pattern plate formed in a circuit pattern shape is fixed to one surface of a resin plate to form a wiring board, and necessary circuit components are connected to the metal pattern board of this wiring board and one end of a motor shaft is supported. A motor side plate having a bottomed bearing holding portion has been proposed (for example, Japanese Patent Application No. 60-113).
271 (Japanese Patent Laid-Open No. 61-273147).

In the above-mentioned side plate which itself constitutes the circuit wiring board, in order to connect the lead terminal of the circuit component to the metal pattern plate, the above-mentioned circuit component is arranged on the surface opposite to the metal pattern side of the side plate, The lead terminal is guided through the metal pattern plate through the small holes provided in the substrate, the surface of the metal pattern plate is immersed in the melting solder bath, and the lead terminal is soldered to the metal pattern plate.

Further, as a bearing holding structure for a side plate for a motor, there is known a structure having a vent hole for communicating the bottom surface of a bottomed bearing with the outside of the side plate (for example, Japanese Utility Model Publication No. 56-12378).

(Problems to be solved by the invention) When the oil-impregnated bearing is press-fitted into the bottomed bearing holding part formed on the side plate and the shaft end of the motor shaft is fitted into this bearing, the bottom part of the bearing holding part is in an airtight state. Becomes Therefore, when a temperature change occurs in the oil-impregnated bearing portion due to the operation of the motor, especially when the temperature rises, the oil pressure in the oil-impregnated bearing exudes to the outside due to the pressure increase of air under the airtight state. There's a problem. As a means for solving this problem, the conventional bearing holding structure having the above-mentioned ventilation hole is effective, but since the above-mentioned ventilation hole communicates the bottom surface of the bearing with the outside of the side plate, as described above, When the circuit pattern is soldered by immersing the surface of the metal pattern plate in a molten solder bath, there arises a problem that solder, some or flux enters the bearing through the ventilation hole.

(Means for Solving the Problems) One surface of the side plate having the circuit pattern and the other surface of the side plate having the bearing holding recess are blocked by the bottom of the bearing holding recess and the bearing holding is performed. At least one ventilation groove is provided between the bottom surface of the bearing recess and the inner surface of the side plate when the side plate is mounted on the motor between the circumferential surface of the bearing and the bearing holding recess.

(Advantageous Effects) According to the present invention, the circuit pattern and the bearing holding recess are formed on the motor side plate by the structure in which the bottom surface of the bearing holding recess is used to block between one surface of the motor side plate and the bearing. Since the one surface and the other surface are independently separated, it is possible to prevent the intrusion of dust or the like into the bearing when the circuit pattern is soldered.

Further, by providing at least one ventilation groove that connects the bottom portion of the bearing holding recess and the other surface between the peripheral surface of the bearing and the bearing holding recess, the inside of the bearing holding recess is constantly ventilated. It is avoided that the airtight state is caused and the adverse effect due to the blocking structure on the bearing fitted in the bearing holding recess is prevented. That is, it is possible to prevent the bearing oil from seeping out to the outside due to the temperature change of the bearing portion, and to eliminate the adverse effect on the circuit pattern.

(Embodiment) In FIG. 1, a side plate 1 of a motor is a synthetic resin plate 2,
A metal pattern 3 is mounted on the outer surface of the resin plate 2 by insert molding, and is fitted and fixed to one end surface of the motor case 4. The metal pattern 3 is
It is made of a metal plate such as steel or copper, and is formed in a circuit pattern shape to form a motor control circuit, as shown in FIG.

On the inner side surface of the side plate 1 (upper surface in FIG. 1), an integrated circuit 5, which is a circuit component required for a motor control circuit, a capacitor 6, and other resistors are arranged, and lead terminals 5a and 6a of those components are arranged. The metal pattern 3 is guided to the alligator through the small holes 7 formed in the side plate 1 and soldered to the metal pattern to form a control circuit. In FIG. 1, reference numeral 8 indicates a brush whose base is fixed to the side plate 1,
The end of the commutator (not shown) provided on the motor shaft 9 is brought into contact with the commutator.

The oil-impregnated bearing 10 of the motor shaft 9 is fitted and fixed in a bearing holding recess 11 formed in the center of the inner surface of the side plate 3. A ventilation groove 12 is formed on the inner peripheral surface of the bearing holding recess 11 as shown in FIG.
The bottom portion 11a of the bearing holding recess 11 communicates with the inner side surface of the side plate 1.

The ventilation groove 12 prevents the bearing from being blocked by the motor shaft and sealing the small space formed at the shaft end of the motor shaft.

The ventilation groove may be provided on the bearing instead of providing it on the inner peripheral surface of the bearing holding recess. Fig. 4 shows the bearing 40 with ventilation grooves
An example in which 42 is provided is shown.

As shown in FIG. 5, the bearing holding recess is formed by the bearing holding hole 51a formed in the side plate 51 and the metal pattern 53, and the bearing holding structure in which the end surface of the motor shaft 59 is received by the metal pattern 53 is adopted. The radial groove on the far end of the bearing 50
A ventilation groove can be formed by 52 and the groove 54 provided on the inner peripheral surface of the hole 51a.

The form of the ventilation groove in the present invention is not limited to the above embodiment. For example, a bearing having relatively flat knurls on its peripheral surface can be press-fitted into the bearing holding recess of the side plate, and the grooves of the flat knurls can be used as ventilation grooves.

[Brief description of drawings]

FIG. 1 is a sectional view of a side plate for a motor showing an embodiment of the present invention, FIG. 2 is a plan view showing a metal pattern, FIG. 3 is an exploded perspective view of a bearing portion of FIG. 1, and FIG. FIG. 5 is a perspective view showing a ventilation grooved bearing, and FIG. 5 is a sectional view showing another embodiment of the present invention. 1 ... Motor side plate, 11, 51a ... Bearing holding recess, 11a
…… Bottom, 12,42,52,54 …… Ventilation groove.

Claims (1)

[Scope of utility model registration request] 1. A circuit pattern for connecting circuit components constituting a motor control circuit is provided on one surface, and a bearing holding recess for a motor is provided on the other surface, and an oil-impregnated bearing is provided in the bearing holding recess. At least one of the fitted motor side plates that blocks the oil-impregnated bearing from one surface by the bottom of the bearing holding recess and connects the bottom of the bearing holding recess and the other surface. A bearing holding structure in which two ventilation grooves are provided between the peripheral surface of the oil-impregnated bearing and the bearing holding recess.