JPS5845500Y2 - Motor spark absorption element mounting structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for attaching a spark absorbing element such as a varistor or a capacitor to a commutator.

Generally, a plurality of spark absorbing elements as described above are connected in a ring shape by conductive ring plates, and have commutator terminals projecting radially from the commutator pieces of the commutator, and connecting terminals extending inward from the conductive ring plates. Although a method of connecting the commutator terminals and the connecting terminals by soldering is often adopted, it is difficult to position the commutator terminals and the connecting terminals during the soldering work.

In order to solve the above problems, the following was developed.

(However, this is not publicly known) In other words, as shown in FIGS. 1 and 2, a groove opening provided on the outer periphery of the commutator insulating base A,
A positioning portion consisting of a positioning protrusion that projects inward from the spark absorbing ring body (E) which connects the spark absorbing element (C) in an annular manner with a conductive ring plate (2) and that fits into the recessed groove opening is provided, and the positioning portion is positioned by the positioning portion. After that, the commutator terminal T and the connecting terminal T were connected by soldering.

However, when the positioning protrusion is fitted into the recessed groove opening without any gaps, a situation arises in which the fitting is forced due to variations in the dimensions of the parts, and in this case, the connection between the spark absorbing element C and the conductive ring plate 2 is interrupted. A large load is applied to the conductive ring plate 2, causing problems such as the deformation of the conductive ring plate 2, or the joint of the spark absorbing element 3 coming off, so a slight gap should be provided between the recessed groove opening and the positioning piece so that the positioning piece is fitted loosely. Furthermore, due to space constraints, the depth of the groove opening cannot be made deep, which results in the problem that the positioning and fixing cannot be performed with high precision, causing the spark absorbing ring body to tilt or come off during soldering work. Particularly when soldering is performed using an automatic machine, many soldering defects occur.

The present invention was developed in view of the above problems, and its purpose is to position and fix the commutator and spark absorbing ring without applying a large load to the spark absorbing element and the conductive ring plate. To improve accuracy and reduce soldering defects such as tilting or coming off of a spark absorbing ring during soldering work.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 5.

1 is a commutator, and a commutator piece 3 divided into three parts is attached to the outer periphery of a small-diameter cylindrical part of a stepped cylindrical insulating base 2, and commutator terminals 4 are extended radially from the commutator piece 3. It's out.

Further, three grooves 5 are formed on the outer periphery of the stepped portion of the insulating base 2.

Reference numeral 6 denotes a spark absorbing ring body in which three spark absorbing elements 7 are connected in a ring shape by three conductive ring plates 8.

Connecting terminals 9 connecting to the commutator terminals 4 are extended inward from the center of each of the ring plates 8, and the commutator A positioning protrusion 10 that loosely fits into the groove 5 of the insulating base 2 with a slight gap in the circumferential and axial directions, a locking claw 11 that presses against the outer periphery of the insulating base 2, and a locking claw 11 that extends into the ring body. It's out.

The width of the groove 5 of the commutator insulating base 2 is made smaller than the width of the positioning protrusion 10 of the spark absorbing ring 6, and the width of the locking pawl 11 of the spark absorbing ring 6 is made narrower. The elastic modulus is made small to facilitate deformation during press-fitting, thereby reducing the load applied to the joint between the spark absorbing element 7 and the conductive ring plate 8.

Therefore, when attaching the spark absorbing ring 6 to the commutator 1,
A positioning protrusion 1 of the spark absorbing ring 6 is placed in the groove 5 of the insulating base 2.
0 to align the connection terminal 9 of the spark absorption ring 6 and the commutator terminal 4 in the circumferential and radial directions, and press the locking pawl 11 against the insulating base 2 to close the spark absorption ring. body 6
is temporarily fixed to the commutator 1, and then the two are connected by soldering.

In the above embodiment, the locking pawl 11 is provided on the spark absorbing ring 6, but it may be provided on the commutator insulating base 2 instead.

As described above, the present invention aligns the commutator terminals and the connecting terminals by loosely fitting the concave groove formed on the commutator insulating base and the protrusion formed on the conductive ring plate, and also achieves commutator insulation. A locking claw, which is an elastic locking member, is provided to protrude from one of the base and the conductive ring plate and is pressed against the other to connect the commutator terminal and the connecting terminal. This prevents a large load from being applied to the spark absorbing element and the conductive ring plate, preventing the conductive ring plate from deforming or coming off at the joint, and also prevents spark absorption during soldering work. Since the ring body does not come off or tilt, it has the effect of improving workability and reducing soldering defects, and is particularly effective for soldering work using automatic machines.

[Brief explanation of the drawing]

Figure 1 is a front view of the conventional example, and Figure 2 is the A- in Figure 1.
A sectional view, FIG. 3 is a front view showing an embodiment of the present invention, FIG. 4 is a BB sectional view in FIG. 3, and FIG. 5 is a C-C sectional view in FIG. 3. It is. DESCRIPTION OF SYMBOLS 1... Commutator, 2... Insulating base, 4... Commutator terminal, 5... Concave groove, 7... Spark absorption element, 8... Conductive ring plate, 9... - Connecting terminal, 10... positioning protrusion, 11... locking claw.

Claims (1)

[Claims for Utility Model Registration] A plurality of spark absorbing elements connected in an annular manner by a conductive ring plate and disposed concentrically around the outer periphery of a commutator, and a connection protruding inward from the conductive ring plate. In a mounting structure for a spark absorbing element of a motor in which a terminal and a commutator terminal protruding outward from a commutator are connected, a groove is formed on the outer periphery of an insulating base of the commutator, and a groove is formed in the outer circumference of the insulating base of the commutator. A projecting piece is formed on the conductive ring plate to be loosely fitted through a slight gap. A locking claw, which is an elastic locking member, is provided to protrude from one of the insulating base and the conductive ring plate of the commutator, and the tip of the locking claw is connected to the commutator base and the conductive ring plate. A mounting structure for a spark absorbing element of a motor, characterized in that the element is pressed against the other side of the element.