JPH0340069Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a motor end which is integrally assembled by caulking and fixing the end case to the yoke while the brush holder is temporarily held in the end case. This invention relates to a structure for temporarily holding a brush holder in a case.

[Problems to be solved by the prior art and the invention] Conventionally, a motor is assembled by caulking and fixing the outer periphery of the end case with the brush holder attached to the outer periphery of the yoke opening end. Some motors have this structure, and further have lead wires for wiring necessary for drive control of the motor passed through the end case and the brush holder and wired inside the motor. In this case, it is necessary to attach a grommet for protection and waterproofing at the penetration portion of the wiring lead wire. However, in the past, the grommet was attached to the end case in such a way that it would not come off, and the brush holder was attached integrally to the end case using appropriate fixing means such as rivets, and in this way the brush holder and grommet were attached. Since the attached end case was fixed to the yoke by caulking as described above, a special process for fixing the brush holder to the end case was required during the motor assembly process, which complicated the process. In order to prevent the grommet from falling out, the grommet needs to have a drum shape with both ends having a larger diameter than the insertion hole on the end case side, which makes it difficult to install. ,As a result,
It has the disadvantage of extremely poor workability, and there is a strong demand for improvements in these areas.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a temporary holding structure for a brush holder in an end case of a motor that can eliminate these drawbacks. In the motor, the brush holder is arranged so as to be placed against the inner surface of an end case that is assembled by caulking and fixing the outer peripheral edge to the opening end of the yoke. The yoke to be fixed and the end case are sandwiched between the outer peripheral edges of the end case so as to be integrally assembled, and the lead wire for wiring is passed through the end case and the brush holder. A grommet attached to the wire penetration part is attached to a flange part sandwiched between the end case and the brush holder, and the inner cylindrical surface protrudes from the flange part toward the end case side so that the lead wire is tightly fitted. The grommet is formed into a through hole, and the outer cylindrical surface is integrally formed with a cylindrical protrusion that is inserted in a tight fit into the insertion hole drilled in the end case, and the cylindrical protrusion of the grommet includes: A fitting groove portion opening on the brush holder side is formed between the inner and outer cylindrical surfaces, and the brush holder is formed with a cylindrical protrusion portion facing the end case side that fits tightly into the fitting groove portion. The outer cylindrical surface of the cylindrical protrusion of the grommet is inserted into the insertion hole of the end case in a tight fit, and the cylindrical protrusion of the brush holder is fitted into the fitting groove of the grommet in a tight fit, so that the brush can be removed. This device is characterized in that the holder is temporarily held in the end case via a grommet.

According to the present invention, with this configuration, the brush holder can be temporarily held in the end case using a grommet through which the lead wires are passed, and the grommet itself can be easily attached.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, 1 is a motor yoke, 2 is an end case to be described later, and a motor shaft 3 is rotatably supported on these cover bodies 1 and 2. It is formed on the street. Note that 4 is a bearing.

The end case 2 has a recess 2a in the center thereof into which a bearing 4 that supports the motor shaft 3 is press-fitted.
is formed, and furthermore, a cylindrical portion 2b is formed on the outer peripheral edge.
is formed, and the peripheral edge of this cylindrical portion 2b has a stepped shape with a diameter larger than that of the cylindrical portion 2b, and a caulking margin 2c is formed. The end case 2 can be integrally assembled with the yoke 1 by caulking and fixing it to the outer peripheral edge of the open end of the yoke 1. Furthermore, the end case 2 is provided with a drain hole 2d so as to be located at the lower position when assembled to the main body of a vehicle, etc., and an insertion hole 2e is provided between the drain hole 2d and the recess 2a. A lead wire 9 is inserted therethrough as will be described later, and positioning grooves 2f and 2g are formed at the upper and lower positions.

On the other hand, 6 is a disc-shaped brush holder that is assembled with its outer surface against the inner surface of the end case 2, and its flange-shaped outer peripheral edge is connected to the outside of the yoke and the end case. It is set to a size that can be held between the peripheral edges, and is configured to be integrally assembled with the end case by caulking and fixing the outer peripheral edge of the end case to the yoke opening end. Further, the brush holder 6 used in the present embodiment has a brush 7 and an elastic force 7 that urges the brush 7 in the axial direction on its inner surface.
The brush holder 6 is of a type in which necessary parts such as a pair of left and right holder parts 6a into which the brush holder A is assembled, and a mounting part 6g into which members such as terminals are mounted are integrally molded by molding. , positioning protrusions 6b and 6c are formed vertically to correspond to the drain hole 2d and positioning groove 2f of the end case 2, respectively, and a drain hole 6d is provided in the lower positioning protrusion 6c. has been done. In addition, a flat portion 6f is formed in a step-like manner so as to have a gap with the inner surface of the end case 2 at a portion of the brush holder 6 corresponding to the vicinity of the insertion hole 2e. 2e
At a position corresponding to , a cylindrical protrusion 6e is integrally provided to protrude toward the end case 2 side.

Further, reference numeral 8 denotes a grommet formed of a rubbery elastic body, and the grommet 8 is formed with a flange portion 8c which is held in the gap between the flat portion 6f and the inner surface of the end case 2. In addition, at a position corresponding to the insertion hole 2e,
A cylindrical protrusion 8b is integrally formed toward the end case 2 side. And this cylindrical protrusion 8b
The outer cylindrical surface is designed to be inserted into the insertion hole 2e in a tight fit to provide waterproofing and temporary support, and the inner cylindrical surface is designed for wiring necessary for controlling the drive of the motor. An annular through hole 8d is formed to allow the lead wire 9 to pass through the lead wire 9 in a tight-fitting manner, and is configured to prevent the lead wire 9 from slipping out and to be waterproof.

Moreover, between the inner and outer cylindrical surfaces of the cylindrical protrusion 8b,
A fitting groove 8a is formed which is open on the side of the brush holder 6, and the cylindrical protrusion 6e of the brush holder 6 is tightly fitted into the fitting groove 8a. The grommet 8 can be temporarily supported on the brush holder 6 by fitting in a fitting manner. In addition, in the figure, 8e is a tongue piece for waterproofing.

In the embodiment of the present invention constructed as described above, when the end case 2 is caulked and fixed to the yoke 1, it is not necessary to integrally fix the brush holder 6 to the end case 2, and the brush holder 6 is securely temporarily held by the grommet 8. It can be easily assembled in the assembled state.

That is, the fitting groove 8a of the grommet is tightly fitted into the cylindrical protrusion 6e of the brush holder 6, and the cylindrical protrusion 8b of the grommet 8 is fitted tightly.
By inserting the grommet 8 into the insertion hole 2e of the end case 2 in a tight-fitting manner, the grommet 8 can be inserted into the brush holder 6 and the end case 2.
The brush holder 6 is temporarily held by the end case 2 via the grommet 8. In this case, the flange portion 8c of the grommet 8 is sandwiched between the end case 2 and the brush holder 6, and with the brush holder 6 temporarily held in this way, the end case 2 to the yoke 1 and caulking the caulking allowance 2c, an integral assembly including the brush holder 6 is completed.

In this way, in the present invention, the end case 2 with the brush holder 6 is fixed to the yoke 1 by caulking. While fitting into the fitting groove 8a, the cylindrical protrusion 8b in which the fitting groove 8a is formed is inserted into the insertion hole 2 of the end case 2.
By simply inserting the brush holder 6 through the end case 2, the brush holder 6 can be temporarily held securely in the end bracket 2. Therefore, the regular process of fixing the brush holder 6 to the end case 2 as in the past is completely unnecessary. Assembling can be performed by effectively utilizing the grommet 8, and the work process can be simplified.

Moreover, in this case, the grommet 8 has a structure in which the flange portion 8c is sandwiched between the end case 2 and the brush holder 6 and is securely prevented from coming off. There is no need to form it into a drum shape with a diameter larger than the insertion hole 2e on both sides, and it is sufficient to set it in a tightly fitted state to the extent that it can be temporarily held as described above.
Therefore, it is possible to reliably prevent the grommet 8 from becoming difficult to attach, and it is possible to significantly improve work efficiency.

Furthermore, in this embodiment, the grommet 8 is disposed below the motor, and the drain hole 2d is provided opposite thereto, so that the tongue piece 8e can be easily formed to prevent water from entering through the grommet 8. This structure allows the motor to be constructed so that water can be quickly drained, while effectively protecting the motor from intrusion of rainwater and the like. Furthermore, when the brush holder 6 is caulked and fixed, the positioning protrusions (attachment pieces) 6b and 6c of the brush holder 6 are connected to the yoke 1 and the end case 2.
Since the brush holder 6 is held between the brush holder 6 and the brush holder 6, it is advantageous that even if the brush holder 6 is temporarily held, the brush holder 6 can be reliably assembled without wobbling after being crimped and fixed. In the above embodiment, the positioning protrusions having the function of preventing rattling are arranged in two positions, one above the other, but the number and position are not necessarily limited to this. If the holder part 6a is used as shown in Fig. 6, when molding the brush holder 6, the flow of resin at the holder part will be improved and the occurrence of defects can be greatly reduced. This is preferable because it can increase the strength of the material.

[Operations and Effects] In short, the present invention is constructed as described above, and although the end case with the brush holder is fixed to the yoke by caulking, the brush holder does not have enough space for the lead wire to pass through. The brush holder is temporarily held on the end case side by making effective use of the necessary grommets, and the process of fixing the brush holder to the end case, which was previously necessary, is completely unnecessary, simplifying the work process. That will happen. Moreover, this grommet is assembled with the flange portion sandwiched between the end case and the brush holder, so it is extremely time consuming to assemble the grommet in the traditional way, where the grommet is shaped like a drum and the large diameter portion is used to prevent it from coming out. There is no need to create a configuration that requires heavy work, and it is sufficient to just fit it into the insertion hole and temporarily hold it, which significantly improves the ease of assembling the motor and improves productivity. This will greatly contribute to the

[Brief explanation of the drawing]

The drawings show an embodiment of the temporary holding structure of the brush holder in the end case of the motor according to the present invention, in which Fig. 1 is a cross-sectional perspective view of the main part of the motor, and Fig. 2 A and B show the brush holder. Rear view and vertical sectional view of the end case in a state where it is temporarily held, Figure 3A,
B and C are front views, bottom views, and vertical cross-sectional views of the end case; Figures A, B, and C are front views, rear views, and vertical cross-sectional views of the brush holder; Figures A, B, and C are grommet views. A front view, a bottom view, a sectional view, and FIG. 6 are a rear view of a brush holder showing another embodiment. In the figure, 1 is a yoke, 2 is an end case, 2e is a through hole, 6 is a brush holder, 6e is a cylindrical protrusion, and 8
8a is a fitting groove, 8b is a cylindrical protrusion, and 8c is a flange.

Claims (1)

[Scope of utility model registration request] On the inner surface of the end case, which is assembled by caulking and fixing the outer peripheral edge to the outer peripheral edge of the yoke opening end,
A motor that is arranged so as to fit against the outer surface of a disc-shaped brush holder, which has a holder portion formed on the inner surface for incorporating a brush and a bullet that urges the brush in the axial direction. The outer circumferential edge of the brush holder is set to a size such that it can be held between the outer circumferential edges of the yoke and the end case, and the outer circumferential edge of the end case is fixed to the yoke opening end by caulking. While the configuration is such that it is integrally assembled with the case, when a grommet for protection and waterproofing of the lead wire is attached to the penetration part of the wiring lead wire provided in the end case and the brush holder, the grommet is attached to the end case and the brush holder. A flange part is sandwiched between the brush holder and the flange part, and the inner cylindrical surface becomes a through hole that protrudes toward the end case side and passes through the lead wire in a tight fit, and the outer cylindrical surface becomes the end case side. The grommet is integrally formed with a cylindrical protrusion that is inserted into an insertion hole drilled in the case in a tight-fitting manner, and the cylindrical protrusion of the grommet is provided with an annular fitting groove that opens on the brush holder side from the inside and outside. A cylindrical protrusion is formed between the cylindrical surfaces, and the brush holder has a cylindrical protrusion facing toward the end case that fits tightly into the fitting groove, so that the outer cylindrical surface of the cylindrical protrusion of the grommet By inserting the brush holder into the insertion hole of the end case in a tight fit, and fitting the cylindrical protrusion of the brush holder into the fitting groove of the grommet in a tight fit, the brush holder can be temporarily attached to the end case via the grommet. A structure for temporarily holding a brush holder in an end case of a motor, the structure being configured to hold a brush holder.