JPH02219447A - Armature for starter - Google Patents

Abstract

PURPOSE:To reduce the size and the weight by forming a plurality of blades on the core plates at the opposite sides of the inner circumference of coil and circulating the air by varying the direction of the blade while furthermore making a vent axially through the core at the position of the blade thereby cooling the bag space section, the interior of the core, commutator, and the like. CONSTITUTION:A plurality of blades 12 are formed at positions closer to the inner circumferential side than the slots to be buried with the coil 5 of a core plate 13 at the opposite ends of the core 4. Rised hole section serves as an air inlet/outlet and the air is circulated by varying the direction of the blades. A vent communicated to the side of a commutator insulator 6 is made through the core 4 sandwiched by the core plates 13 at the opposite ends. By such arrangement, the bag space 14, the interior of the core 4, the commutator 7, and the like can be cooled, and the size and the weight can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starter for starting an engine, and particularly to an armature suitable for improving cooling.

[Conventional technology]

As described in Japanese Patent Application Laid-open No. 60-121940, in the conventional device, after winding is completed, a claw that matches the shape of the cooling fan is inserted into the tee portion between the slots at both ends of the core plate on the outer periphery of the coil. It was formed in one direction. On the other hand, in the one described in JP-A-56-31349, ventilation holes are provided in the commutator and the inner peripheral part of the core, and cooling is performed by external ventilation, and no blades are formed at both ends of the core.

[Problems to be Solved by the Invention] The above conventional technology causes teeth between the coils, which easily damage the coils, and the cooling fans are arranged close to each other, making it difficult to obtain a reasonable air volume. First, it only disturbed the air around the outer periphery of the core, and the inside of the core could not be cooled.

Other conventional technologies have a structure in which air is discharged from the commutator through the inside of the core to the outside using a cooling fan mounted on the shaft, resulting in problems such as a long shaft length and high cost. there were.

The purpose of the present invention is to eliminate damage to the coil and to cool the bag space by rationally formed blades on both sides of the core.
The purpose is to cool the inside of the core, commutator, etc., thereby reducing size, weight, and cost.

[Means to solve the problem]

The above purpose is to form a plurality of blades located on the inner peripheral side of the coil before winding them around the core plates on both sides, and to change the direction of the blades to effectively circulate air. This is achieved by providing axial ventilation holes in the core where the blades are located.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a partial sectional view of the starter. yoke 1
Permanent magnets 2 corresponding to the number of poles are arranged inside the yoke 1, and a shaft 3 is rotatably supported by a bearing 9 fixed to the end of the yoke 1. A core 4 is stacked on the shaft 3, and a plurality of coils 5 are arranged around the outer periphery. The insulator 6 and the commutator piece 7 are integrally fixed to the shaft 3. A brush 8 is provided on the sliding portion of the commutator 7 to feed an external current to the coil 5.

The core plates 13 at both ends of the core 4 will be explained with reference to FIG. A plurality of blades 12 are formed on the inner peripheral side of the slot 15 in which the coil 5 is buried, and the raised holes serve as air inlets and outlets. FIG. 3 shows an axial cross section of the ventilation hole 11 formed in the core 4 in the first developed view. A ventilation hole 14 communicating from the opposite side to the commutator insulator 6 side is formed in the core 4 sandwiched between the core plates 13 at both ends. When the armature rotates in the direction of the arrow in FIG. 3, air flows in the direction of the arrow due to the action of the blades 12, which are arranged in alternating directions.

The coil 5 and commutator 7 are connected, and varnish 10 is filled to fill the gap between the coils 5. Therefore, a bag space 14 is formed in a space surrounded by the core plate 13, commutator insulator 6, coil 5, and shaft 3. This bag space 14
The temperature inside the commutator 7 becomes high during operation, which promotes an increase in the temperature of the commutator 7. The air in this bag space 14 is discharged to the opposite side, and relatively low temperature air is sent in from the opposite side instead. Since it flows while cooling the inner wall of the ventilation hole 11, an effective cooling effect can be obtained.

Even if the cores and plates 13 on both sides are installed incorrectly during assembly, the direction of air flow will not change.

FIG. 4 shows another embodiment in which the blades 12 are oriented every second, and the air flows in adjacent ventilation holes 11 in the same direction. In any case, the direction of air flow should be approximately half to the left and the other half to the right.
There is no need to restrict the ventilation direction based on location.

5 and 6 show the shape of the blades of other embodiments, in which the blades 16 have a structure in which the outer peripheral part is connected to the core plate 13 and the inner peripheral part is separated, and the blades 17 are formed in the inner and outer peripheral parts. Both have a structure in which they are connected to the core plate 13 and punched out. Further, in FIG. 7, a blade 18 made of a material different from that of the core plate 13 is attached by welding, crimping, etc. in consideration of rusting of the blade. The hole 18a is an air inlet/outlet. The core plate 131 blades 12, 16, 17, and 18 may be made of resin or other insulating plates in consideration of rust prevention and weight reduction.

FIG. 8 shows a case where air holes 19 are provided in the insulator 6 of the commutator, and air flows in the direction of the arrow shown in FIG. 9, making cooling more effective.

〔Effect of the invention〕

According to the present invention, since the blades 12 are formed on the inner peripheral side of the coil 15 before the winding operation, there is no damage to the coil 5, and the blades 12 on both the left and right sides face each other, and the blades 12 on the left and right sides are connected. Since the air hole 11 is provided, an effective air flow is formed,
This has the effect of cooling the inside of the core 4 and at the same time cooling the inside of the bag space 14, thereby suppressing the rise in temperature of the commutator 7 and the brush 8.

This makes it possible to reduce the size and weight, and has the effect of improving reliability and extending life.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of the main part of a starter according to an embodiment of the present invention, FIG. 2 is a partial perspective view of a core plate, and FIG.
Figure 4 is a developed view corresponding to the V-V cross section of another embodiment, and Figures 5, 6, and 7 show examples showing blades of other shapes. FIG. 8 is a cross-sectional view of the main part of the starter of another embodiment in which air holes are provided in the inner circumferential portion of the commutator, and FIG. 9 is a developed cross-sectional view taken along the line -■ in FIG. 8. DESCRIPTION OF SYMBOLS 10... Varnish, 11... Ventilation hole, 12... Feather, 13... Core plate, 14... Bag space, 16
, 17° 18...Blade, 19...Air hole. Agent Patent Attorney Katsutoshi Ogawa - Trial Attorney □、'・-I昂゛ にFig. 4X Fig. 7/lf /3(L Fig. 6 Fig. 8

Claims (1)

[Claims] 1. In an armature in which a plurality of coils are arranged on the outer periphery of an armature core of a starter for starting an engine, ventilation holes are provided in the axial direction inside the coils, and the cores on both sides of the core are provided with ventilation holes in the axial direction. An armature for a starter, characterized in that blades are formed in the plate where the ventilation holes are located. 2. In claim 1, the direction of the blades formed on one side of the core plate is such that approximately half of the blades are oriented in a direction in which air is taken into the ventilation holes by rotation of the armature, and the remaining blades are An armature for a starter, characterized in that the blades are oriented in a direction in which air is discharged from the ventilation holes, and the blades of the core plate on the opposite side are oriented in opposite directions to the directions described above. 3. The starter armature according to claim 1, wherein the blades are formed by punching out the core plate. 4. The starter armature according to claim 1, wherein the blades are attached from a material different from that of the core plate. 5. The starter armature according to claim 1, wherein the core plate and the blades are made of resin other than metal or other insulating plate. 6. In claim 1, 1 on the inner circumference of the commutator.
A starter armature characterized by having more than one air hole. 7. In claim 1, the direction of the blade is
An armature for a starter, characterized in that the armature is formed in a direction in which air flows axially toward the commutator side.