JPH0376412A - gear bearing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a bearing device for a gear used in a dial drive device of a radio receiver or the like.

BACKGROUND OF THE INVENTION In recent years, there has been a trend toward lower prices for all products, including home appliances, and there has been a demand for products to be significantly lower in cost. To this end, efforts are being made to rationalize and simplify the internal structure of products.

Hereinafter, a conventional gear bearing device will be described with reference to the drawings.

Figures 3 and 4 show a dial drive device, which is an example of a conventional gear bearing device.
The figure is a sectional view of the device assembled into a product. In each figure, 1 is a diamond knob, 2 is a bearing for the diamond knob, and is integrally formed with the chassis 3. 4 is a pointer hook, 6 is a pointer provided integrally with the pointer rack, 6 is a rack guide, 7 is a pointer guide, 8 is a small diameter external gear that meshes with the internal gear 9, and 10 is integrated with the internal gear 9. A hollow external gear, 11 a pointer rack drive gear, 12 a variable capacitor drive gear, 13 a variable capacitor, 14 a printed circuit board, 16
16 is the front cabinet, and 16 is the rear cabinet.

The operation of the dial driving device configured as described above will be described below.

First, when the dial knob 1 is rotated in a certain direction, the rotation is transmitted to the internal gear 9 that meshes with the small diameter external gear 8 that is integrally molded on the dial knob 1. Variable capacitor adjustment shaft 1 via gear 1°
The rotation is transmitted to the rectifier drive gear 12 fixed at 3, and any receiving frequency can be selected. At the same time, the pointer rack 4 meshing with the second small-diameter external gear 11 provided on the dial knob 1 moves along the rack guide 6 in the same direction as the rotation direction of the knob, and the pointer provided at the tip of the pointer rack moves. 5 moves along the pointer guide 7.

Problems to be Solved by the Invention However, the above configuration requires a separate part for the bearing that holds the dial knob, which has the problem of increasing the number of man-hours for product assembly and increasing costs. was. -! In addition, because the bearing of the dial knob and the bearing of the internal gear are separate, it is difficult to obtain accurate center distance, and the tuning operation feels rough.The backlash of the gear is large, and the dial knob However, there was a problem in that the tracking accuracy of tuning with respect to the operation of is reduced.

The present invention solves the above-mentioned problems, and provides a gear bearing device that eliminates the need for a bearing component for an external gear that meshes with an internal gear, and that has high gear meshing accuracy.

Means for Solving the Problems In order to solve the above problems, the gear bearing device of the present invention has the following features:
One side of the rotating shaft with a small-diameter external gear is supported by a rib integrally molded into the cabinet and a bearing groove that is concentric with the gear provided on the internal gear, and the other bearing is installed in the cabinet. The cabinet is provided with a protrusion that prevents the internal gear from deflecting in order to regulate the thrust direction of the rotating shaft by means of a recess.

Effect The present invention improves the accuracy of the distance between the rotation centers of the small-diameter external gear and the rotation center of the internal gear with the above-described configuration, and at the same time, connects the rotating shaft with the small-diameter external gear to a separate bearing component. There is no need for the shaft to be supported by the shaft, and the configuration can be simplified.

EXAMPLE Hereinafter, an example of the gear bearing device of the present invention will be described with reference to the drawings.

1 and 2 show a dial driving device according to an embodiment of the present invention. In each figure, 21 is a dial knob, 2
2 is a small-diameter external gear that meshes with the internal gear 28; 23 is a dial knob rotating shaft; 24 is a rack drive gear; 26 is a recess for the bearing of the dial knob 21; 26 is a second dial knob rotating shaft; An internal gear, 29 is an arc-shaped bearing groove concentric with the gear provided on the inner surface of the internal gear on the gear 28 side, 3o is an external gear integrally molded with the internal gear 27, and 31 is a variable capacitor adjustment. A variable capacitor drive gear coupled to a shaft 34, 32 a pointer rack, 33 a front cabinet,
36 is a printed wiring board, 36 is a rear cabinet, 37
is a pair of ribs for bearings integrally molded into the rear cabinet,
38 is a projection integrally molded on the rear cabinet, and has a bearing groove 28 provided on the gear-side inner surface of the internal gear 27 opposite to the external surface of the internal gear 2, and a small-diameter external gear 22. It is constructed with a small gap as long as the fitting length of the rotating shaft 23.

The operation of the gear bearing device configured as described above will be described below.

First, when the dial knob 21 is rotated in a certain arbitrary direction, the rotation is transmitted to the pointer rack 32 and the internal gear 27 via the small-diameter external gear 22 and the rack drive gear 24 integrally molded on the dial knob 21. The external gear 3° integrally formed with the internal gear also rotates, and an arbitrary reception frequency can be selected via the variable condenser drive gear 31 fastened to the adjustment shaft of the variable condenser 34.

Here, one end of the dial knob 21 is connected to the front cabinet 3.
3, the dial knob rotation shaft 23-
A is fitted and received. Moreover, the other is the internal gear 2
The rotary shaft 23-b at the other end of the dial knob 21 is fitted into the arc-shaped bearing groove 29 provided on the side surface of the gear side of the dial knob 21, thereby regulating the position of the dial μ knob 210 in the radial direction relative to the internal gear 27 at the center of rotation. In order to control the position of the internal gear 27 in the circumferential direction, the second rotating shaft 26 of the dial knob 21 is molded integrally with the rear cabinet 36 or sandwiched between ribs 37. In addition, internal gear 2
7 bends toward the rear cabinet side, and the rear cabinet 36
A protrusion 38 is provided on.

Effects of the Invention As described above, according to the present invention, there is no need for a separate bearing component for a rotating shaft having a small-diameter external gear, and it is possible to reduce assembly man-hours and material costs. You can try to bring it down. In addition, since the rotating shaft with the small-diameter external gear is supported by fitting into the bearing groove on the internal gear side, the accuracy of the distance between the two gears is improved, resulting in stable and smooth rotation. Not only is it possible to transmit the rotation, but also it is possible to improve the followability of the frequency change with respect to the rotation of the dial knob □.

[Brief explanation of drawings]

1 and 2 are an exploded perspective view and an assembled sectional view of a dial drive device that is an example of a gear bearing device of the present invention, and FIGS. 3 and 4 are an example of a conventional gear bearing device. FIG. 2 is a drive system diagram and an assembled sectional view of a dial drive device. 21...Dial knob, 27...Internal gear, 29...Bearing groove, 23.26...
...Rotating shaft, 37...Bearing rib, 38...
··protrusion.

Claims (1)

[Claims] An arc-shaped bearing groove provided on the inner surface on the gear side of the internal gear so as to be concentric with the gear, and a rotating shaft having a gear that meshes with the internal gear is received in the radial direction with respect to the internal gear, and the rotation A rib provided on the cabinet so as to restrict the shaft in the circumferential direction with respect to the internal gear, and a rib provided on the cabinet so as to face the other outer surface of the internal gear, and a rib provided on the cabinet so as to restrict the shaft in the circumferential direction with respect to the internal gear, and a rib provided on the cabinet so as to oppose the other outer surface of the internal gear, and a rib provided on the cabinet so as to restrict the shaft in the circumferential direction with respect to the internal gear. A gear bearing device comprising: a protrusion that prevents the rotating shaft from being dislocated due to deflection of the internal gear with a gap smaller than the fitting length.