JPS5823996Y2 - Fan - Google Patents

Description

[Detailed explanation of the idea] This proposal relates to an electric fan with a swinging function.

Conventionally, the power for the oscillation of an electric fan has been extracted by engaging a worm gear with a worm cut into the rear end of the motor shaft, but there have been various problems with the molding of the worm b.

As an improvement on this point, there is a fan oscillation stop device described in Japanese Utility Model Publication No. 51-13248, and a half-toothed device described in Japanese Utility Model Publication No. 50-19092 is available.

The former publication had a complicated structure for preventing rotation between the motor shaft and the worm, and for preventing the polygon from being removed from the motor shaft.

The latter publication has an oil pump drive gear fitted onto the gear shaft with a key, and requires a special member to secure the gear to the shaft.

This proposal was developed in view of the above points, and aims to improve productivity by simplifying the structure by devising a method for forming the worm.

In order to achieve the above object, the present invention uses a non-circular cross-section to prevent rotation between the motor shaft and the worm, and prevents the worm from being removed from the motor shaft by a barrier wall that is the inner surface of the gear support. The structure is such that it is easy to prevent rotation and removal.

An embodiment of the present invention will be described below with reference to the drawings.

1 is the electric motor of the fan, 2 is its rear end bracket,
3 is a gear support part molded in two pieces on the end bracket 2;
4 is pivotally supported by the gear support 3, and inside the gear support 3 is a worm gear 7 that meshes with the worm 6 of the motor shaft 5.
It is also a transmission shaft having at its lower end a pinion 9 that meshes with an oscillating gear 8 pivotally supported on the lower surface of the gear support 3.

The other end of a connecting rod 10, one end of which is connected to the neck piece of the electric fan, is connected to the oscillating gear 8, so that rotation of the oscillating gear 8 causes oscillating motion in parts of the electric motor 1. ing.

Therefore, in the present invention, instead of directly carving a worm on the motor shaft 5 as in the conventional case, a non-circular section 11 as shown in FIG. A sleeve-shaped worm 6 having a blind hole is fitted here in a non-rotatable manner.

A barrier wall 12 is provided on the gear support portion 3 to prevent the worm 6 from coming off.
form.

As for the assembly procedure, as shown in Fig. 3, the worm 6 is placed in the gear support part 3 in advance, and then the rear end of the motor shaft 5 is projected from the inside of the motor 1 and fitted. Furthermore, the thrust load applied to the worm 6 is
It is not impossible for the worm 6 to be received by the motor shaft 5, but in that case it would be necessary to install a new thrust bearing on the barrier wall 12, so the thrust of the worm 6 would always be directed to the left in the figure, that is, toward the front end of the motor shaft 5. It is preferable to select the helical direction and rotational direction of the worm 6 so that the load is received by the front end step portion 13 of the non-circular portion 11 or by the inner surface of the blind hole of the worm 6.

As described above, the electric fan of the present invention has a non-circular part formed at the rear end of the motor shaft and a sleeve-shaped worm fitted therein, so a rolled worm or a synthetic resin worm, which is low in production cost, can be used. As a result, the worm can be formed on the motor shaft more cheaply and in a shorter time than in the case of direct cutting, and since a barrier wall is provided at the gear support section at the rear of the motor to prevent the sleeve-shaped worm from coming out, the gear support section The rear wall serves as a partition wall, and there is no need to provide special fixing means between the worm and the motor shaft as in the past, which also simplifies the production process.

[Brief explanation of the drawing]

The figures show an embodiment of the electric fan of the present invention. Fig. 1 is a sectional view of the main part, Fig. 2 is a sectional view of the motor shaft section taken along the line ■-D in Fig. 1, and Fig. 3 is a worm and the electric motor. FIG. 3 is an explanatory diagram of shaft joining work. 1... Electric motor, 3... Gear support section, 5
...Motor shaft, 6...Sleeve-shaped worm, 7...Worm gear, 8...Obcillating gear, 11...Non Circular cross section, 12...
...A wall.

Claims (1)

[Scope of utility model registration request] In a motor in which an oscillating gear and a worm gear for transmitting rotation to the oscillating gear are attached to a gear support portion formed at the rear of the electric motor,
A non-circular cross section is formed at the rear end of the motor shaft that protrudes from inside the motor, and a sleeve-like worm that meshes with the worm gear is fitted in a non-rotatable manner to the tip of the motor shaft, and a shock is provided to prevent the worm from coming off. A fan with a wall attached to the gear support.