JPH0631353U - Terminal fixed structure - Google Patents

Abstract

(57) [Summary] [Purpose] Even when the dimensions of the insulator change due to changes in temperature and humidity, the screws that prevent the terminals from being fixed are prevented from loosening, and a stable terminal fixing structure is obtained. [Structure] A terminal fixing structure for fixing a terminal 3 to an electric motor stator 1 or the like via an insulator 2. The insulator 2 is provided with a stepped through hole 5 having a small diameter in the middle, the stud 7 is fitted into the large diameter portion 5a on one side of the through hole 5, and the screw 6 is inserted from the large diameter portion 5b on the other side of the through hole 5. Then, the stud 7 is fixed to the insulator 2, and the terminal 3 is attached to the surface of the stud 7 opposite to the insulator 2.
Screwed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a terminal fixing structure formed on an insulator such as a stator of an electric motor.

[0002]

[Prior art]

 In an electric motor or the like, a terminal for relaying a drive coil or other internal circuit and an external circuit may be fixed on an insulator of a stator. Hereinafter, a conventional terminal fixing structure will be described with reference to the drawings. In FIG. 4, an insulator 22 is attached to the upper surface of a stator core 21 formed by stacking a plurality of core elements. A hole 25 is formed from the upper surface of the insulator 22, and the through hole formed in the terminal 23 is overlapped with the hole 25. The hole 25 and the through hole of the terminal 23 are overlapped with each other. A self-tapping screw 26 is inserted through a washer 30. By tightening the screw 26, the terminal 23 is fixed to the insulator 22 by the head of the screw 26 via the washer 30.

Further, as another terminal fixing structure, there is one as shown in FIG. In FIG. 5, the insulator 22 is formed with a hole 25 composed of a small diameter portion 25b and a large diameter portion 25a connected to the lower end thereof so as to vertically penetrate the insulator 22. A terminal 23 and a washer 30 are stacked in this order on the upper surface of the insulator 22, and a screw 36 is inserted through the washer 30, the hole of the terminal 23 and the hole 25, and the screw 36 protruding into the large diameter portion 25a is inserted. A nut 27 is screwed onto the tip of the. The nut 27 is fitted in the large diameter portion 25a. By screwing the screw 36 into the nut 27 in the large-diameter portion 25a, the terminal 23 is pressed and fixed to the insulator 22 side by the head of the screw 36.

[0004]

In any of the conventional examples described above, the insulator 22 in which the terminal 23 is fixed by the screw 26 is made of resin. Therefore, the portion of the insulator 22 to which the terminal 23 is fixed is likely to cause a dimensional change due to an environmental change such as temperature and humidity or a change over time. When the dimensional change occurs, the fixing screw 26 loosens, so that stable fixing cannot be maintained.

The present invention has been made to solve the above problems, and prevents the loosening of the screw of the terminal fixing portion caused by the dimensional change of the insulator to obtain a stable terminal fixing structure. The purpose is to

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a stepped through hole having a small diameter in the middle of the insulator in the fixing part for fixing the terminal to the stator of the electric motor through the insulator. Fit the stud to the large diameter part on one side, insert a screw from the large diameter part on the other side of the through hole to fix the stud to the insulator, and screw the terminal to the surface of the stud opposite to the insulator. It is characterized by having stopped.

[0007]

[Action]

 Insert the stud into one large diameter part of the stepped through hole whose both ends are large by sandwiching the middle small diameter part in the insulator, and screw the screw inserted in the other large diameter part into the stud. By doing so, the stud is fixed. The terminal is fixed to the surface of the stud opposite to the insulator by screws or nuts.

[0008]

【Example】

 An embodiment of a terminal fixing structure according to the present invention will be described below with reference to the drawings. In FIG. 1, an insulator 2 is formed on the upper surface of a stator core 1 formed by laminating a plurality of core bodies. The through hole 5 is formed in the insulator 2 from the upper surface to the lower surface. The through hole 5 has a stepped shape in which a large diameter portion 5a, 5b is formed on the upper surface side and the lower surface side of the central small diameter portion 5c. A screw 6 is inserted through a washer 11 into the large diameter portion 5b below the through hole 5. The tip of the screw 6 penetrates the small-diameter portion 5c of the stepped through hole 5 and is screwed into a screw hole formed in the lower portion of the stud 7. By screwing in the screw 6, the stud 7 is pressed and fixed to the through hole 5 of the insulator 2 on the side of the small diameter portion 5c.

A stud 7 is inserted into the large diameter portion 5 a of the through hole 5 on the side opposite to the insulator 2. The stud 7 has a cylindrical shape, and a male screw 8 is integrally formed on the upper portion thereof. The terminal 3 and the washer 10 are fitted to the male screw 8 in this order from the bottom, and the nut 9 is screwed into the male screw 8. By screwing the nut 9 into the screw 8 and tightening it, the terminal 3 is pressed and fixed to the stud 7 side by the nut 9 via the washer 10.

The fixing structure of the terminal 3 as described above is not a structure in which the terminal 3 is directly fixed to the insulator 2, but is a structure in which the terminal 3 is fixed to the stud 7 fixed to the insulator 2. Therefore, the dimensional change of the insulator 2 does not affect the fixed portion of the terminal 3 at all. Moreover, since the screw 8 for fixing the terminal 3 is directly formed on the stud 7, the terminal 8 can be stably fixed without being loosened.

In the above embodiment, the terminal 3 is fixed by the male screw 8 and the nut 9 formed on the upper portion of the stud 7, but the present invention is limited to such a fixing structure. Instead, for example, the structure shown in FIG. 2 may be used. In FIG. 2, a through hole 5 is formed in the insulator 2 fixed to the upper surface of the stator core 1 from the upper surface to the lower surface. Similar to the example of FIG. 1, the through hole 5 has a stepped shape with large diameter portions 5a and 5b on the upper surface side and the lower surface side across the small diameter portion 5c at the center. The stud 7 fitted to the upper large diameter portion 5a is formed with a screw hole 13 penetrating vertically, and the terminal 3 is screwed on the upper side of the screw hole 13, that is, on the side opposite to the insulator 2. Is fixed by. The stud 7 is inserted into the large diameter portion 5a of the insulator 2, and is fixed by screwing the screw 6 from the large diameter portion 5b side to the lower portion of the screw hole 13 via the washer 11. Also in this embodiment, the terminal 3 is not directly attached to the insulator 2, but is fixed to the stud 7 fixed to the insulator 2, so that The fixed portion of the terminal 3 is not affected by the dimensional change caused by the environmental change and the aging change. Therefore, it is possible to maintain stable fixing of the terminal 3 without loosening the screw 12 or the like.

FIG. 3 shows another embodiment of the terminal fixing structure. In FIG. 3, the stud 7 fitted in the large diameter portion 5a on the upper side of the stepped through hole 5 formed in the insulator 2 is formed with a screw hole 7a penetrating vertically. The long screw 16 is screwed into the screw hole 7a of the stud 7 from the large diameter portion 5b on the lower side of the through hole 5 through the small diameter portion 5c, and the stud 7 is fixed to the insulator 2. The tip of the long screw 16 projects from the upper surface of the stud 7, and the terminal 3 and the washer 10 are fitted to the tip of the screw 16 in this order. There is. Also in this embodiment, since the terminal 3 is not directly attached to the insulator 2 but is fixed on the insulator 2 via the stud 7, the influence of the bending of the insulator 2 is prevented by the fixing portion of the terminal 3. Never receive.

[0013]

[Effect of device]

 According to the present invention, the insulator is provided with a stepped through hole having a small diameter in the middle, the stud is fitted to the large diameter portion on one side of the through hole, and the screw is inserted from the large diameter portion on the other side of the through hole. Since the stud is fixed to the insulator and the terminal is screwed to the surface of the stud opposite to the insulator, the terminal is fixed at the terminal fixing part even if the insulator dimensions change due to temperature change or humidity change. Since there is no dimensional change, the screws do not loosen and it is possible to maintain a stable terminal fixing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a terminal fixing structure according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the terminal fixing structure.

FIG. 3 is a sectional view showing still another embodiment of the terminal fixing structure.

FIG. 4 is a cross-sectional view showing an example of a conventional terminal fixing structure.

FIG. 5 is a sectional view showing another example of the terminal fixing structure.

[Explanation of symbols]

 1 Stator 2 Insulator 3 Terminal 4 Fixing part 5 Through hole 5a Large diameter part 5b Large diameter part 5c Small diameter part 6 Screw part 7 Stud

Claims (1)

[Scope of utility model registration request] 1. A fixing portion for fixing a terminal to an electric motor stator or the like via an insulator, wherein an insulator is provided with a stepped through hole having a small diameter in the middle, and a stud is fitted to a large diameter portion on one side of the through hole. A terminal fixing structure in which a screw is inserted from the large diameter part on the other side of the through hole to fix the stud to the insulator, and the terminal is screwed to the surface of the stud opposite to the insulator.