JPS584262Y2 - shaft mounting device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a shaft mounting device suitable for use in dial devices such as radio receivers, and in particular allows the shaft to be easily and reliably mounted to the cabinet without rattling, and also enables backlash-free transmission. The purpose is to

The conventional method for installing a tuning shaft in a dial device is to insert the shaft through a bearing provided in a cabinet and use a retaining ring of an E IJ song to prevent the shaft from being removed.

However, with this type of method, the shaft is supported at one point or at one point, so it is difficult to increase the stability of the support, and rattling occurs especially between the shaft and the cabinet.Moreover, special tools are required to install the retaining ring. However, due to the fact that it takes a long time to install, it is difficult to expect a stable installation condition.

Therefore, in view of these conventional drawbacks, the present invention provides a shaft mounting device that has a simple configuration, is easy to install, and can achieve stable installation and smooth operation. An example will be explained based on the drawings.

Figure 1 is an exploded perspective view, Figure 2 is an enlarged view of the main parts, and Figure 3 is a cross-sectional view. 1 is a cylindrical geared drive member formed by molding synthetic resin, and 2 is a drive member with a cylindrical gear. The gear part 3 is a cylindrical part.

A plurality of slits 4 are provided on the outer periphery of the cylindrical portion 3 to provide elasticity to the cylindrical portion 3.

Further, a protrusion 5 is provided on the inner surface (shaft insertion surface) of the cylindrical portion 3.

A spring 6 is fitted into the cylindrical portion 3 and is used as an elastic suppressor of the slip mechanism.

Reference numeral 7 denotes a tuning shaft which has a cut groove 8 at a position opposite to the projection 5 and a cylindrical projection 9 at its tip.

Reference numeral 10 denotes a cabinet, and a hole 11 for passing a tuning shaft is provided in the side surface of the cabinet.

Here, the outer diameter of the cylindrical portion 3 of the driving member 10 is formed to be smaller than the diameter of the hole 11.

Further, a boss 12 on the cabinet provided opposite to the hole 11 has a circular recess 13 at a position opposite to the protrusion 9 at the tip of the shaft.

That is, the hole 11 in the side surface of the cabinet 10 and the recess 13 provided in the boss inside the same cabinet serve as the shaft 70 bearing part.

A crown gear 14 meshes with the gear portion 2 of the drive member 1.

15 is a support shaft, and a screw 16 is attached to the crown gear 14.

A compression coil spring 17 is used to press the crown gear 14 into contact with the gear portion 2 of the drive member 1, and is inserted between the EJ ring 18 attached to the lower end of the support shaft 15 and the lower surface of the boss 12. There is.

Reference numeral 19 denotes a tuning knob fixed to the end of the shaft 7 protruding from the cabinet 10.

Further, a dial rope is wound around the pulley portion 14a of the crown gear 14, and the rotation of the crown gear 14 drives a dial pointer and a tuning variable capacitor (both not shown).

In the above embodiment, when inserting the tuning shaft 7 through the geared drive member 1 and attaching it to the cabinet 10,
The cylindrical portion 30 provided with the slit 4 of the driving member 1 is opened using elasticity, so that the protruding portion 5 is formed into the cut groove 8 of the shaft 7.
I get stuck in it.

Further, the spring 6 for the slip mechanism is configured to cause frictional engagement between the inner surface of the cylindrical portion 3 and the outer surface of the shaft 7, and is further configured to prevent the protrusion 5 from coming off the groove 8 due to the spring force. ing.

Further, since the outer diameter of the cylindrical portion 3 of the driving member 10 is made larger than the diameter of the shaft penetration hole 11 on the side surface of the cabinet, the shaft 7 can be attached to the cabinet 10 while preventing the tuning shaft T from coming off from the cabinet 10. be able to.

Therefore, no member is required to prevent the E IJ song from being removed.

In addition, since the shaft 7 is supported by the boss 12 of the integrally molded cabinet and the holes 1102 on the side, the shaft 7 will not shake against the cabinet.
Shirt 1f 0 rotation can be done very smoothly.

On the other hand, the crown gear 14 is engaged with the gear part 2 so as to be pressed against it by the elastic force of the spring 1T.

Therefore, backlash caused by this meshing portion can be reduced, and in combination with the shaft support structure described above, smooth and correct rotational force can be transmitted from the shaft 7 to the crown gear 14.

As is clear from the above embodiments, according to the shaft mounting device of the present invention, a slit is formed on the outer periphery of the cylindrical driving member, and a protrusion is formed on the inner surface of the cylindrical driving member. When inserting the shaft into the drive member, the drive member and shaft can be integrated in a state of frictional engagement by fitting the protrusion into the cut groove of the shaft, and the diameter of the hole in the cabinet (shaft diameter By increasing the outer diameter of the drive member (approximately equal to ), it is possible to prevent the shaft from being pulled out on the inner surface of the cabinet around this hole, which greatly reduces the work involved in installing the shaft compared to conventional configurations. It can be simplified to

Moreover, the shaft is rotatably supported in two places: a boss molded into the same cabinet and a hole on the side, so there is no rattling between the shaft and the cabinet, and smooth rotation can be achieved. .

Further, the crown gear is press-fitted to the gear portion of the drive member by the force of the second spring, and there is little backlash, making it possible to obtain a smooth and stable rotational state.

As described above, the present invention can simplify the structure, improve workability, and provide a shaft mounting device that can operate smoothly and reliably.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention, FIG. 2 is an enlarged perspective view of a main part of a driving member in this embodiment, and FIG. 3 is a sectional view of this embodiment. DESCRIPTION OF SYMBOLS 1... Drive member with gear, 3... Cylindrical part, 4... Slit, 5... Projection, 6
... Spring, 7 ... Tuning shaft, 8 ... Cut groove, 9 ... Cylindrical convex portion, 10 ... Cabinet, 11・・・・・・
・Bearing hole, 12...Boss, 13...
・Cylindrical recess, 14...Crown gear, 15
...Spindle, 17...Spring.

Claims (1)

[Scope of utility model registration request] A cabinet is provided with both a shaft through hole and a bearing part for receiving the tip of the shaft, and a cylindrical cabinet having a plurality of slits in the longitudinal direction of the outer circumference at one end and a gear part at the other end, and has a protrusion on its inner surface. a shaft that is inserted into the drive member, has a distal end supported by the bearing portion, is supported by the shaft through hole of the cabinet, and has a kerf with which a protrusion of the drive member is engaged; , a first spring that elastically presses the slit portion of the drive member through which the shaft is inserted; a support shaft inserted through another hole provided in the bearing portion; a crown gear mounted and engaged with a gear portion of the drive member;
a second spring that is inserted between the other end of the support shaft and the bearing section and presses the crown gear against the gear section; A shaft mounting device characterized in that the shaft is prevented from being pulled out between the end of the drive member and the inner surface of the cabinet around the periphery of the shaft through hole.