JPH036302Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a pulley mounting structure for a washing machine in which a pulley is mounted on the rotating shaft of a rotor blade.

[Conventional technology]

The washing machine generates water flow in the washing tank by rotating rotary blades installed at the bottom of the washing tank. In such a washing machine, as shown in FIG. 3, a rotating shaft 1 having rotary blades 7 attached to its upper end projects downward through a cylindrical bearing 5 attached to the lower surface of the bottom of a washing tank 4. Washable motor (not shown)
A pulley 2 that decelerates and transmits the rotation is fixed.

The bearing 5 is fastened to the bottom of the washing tank 4 with a bearing nut 6.

Further, the rotation of the washing motor is transmitted to the pulley 2 by a V-belt 8.

Then, as shown in FIG. 4, a screw hole 1b into which the mounting screw 3 is screwed is bored in the lower part of the rotating shaft 1, perpendicular to the axial direction, and the boss part 2 of the pulley 2
In a, a round hole 2c through which the rotating shaft 1 passes vertically is bored vertically, and a through hole 2b through which the mounting bolt 3 passes is bored horizontally at right angles to the round hole 2c.

Then, insert the lower part of the rotating shaft 1 into the round hole 2c,
A mounting bolt 3 is screwed into the screw hole 1b through the through hole 2b and is tightened and fixed.

[Problem that the invention attempts to solve]

In the conventional fixing structure of the pulley 2 using the mounting bolt 3, tensile stress caused by tightening and shear stress caused by the torque transmitted to the pulley 2 act on the threaded valley of the mounting bolt 3, resulting in stress concentration. Therefore, bolts made of general steel may cause damage during operation of the washing motor, and to withstand this, it is necessary to increase the diameter of the rotating shaft 1 as much as possible and the diameter of the mounting bolt 3, or to use bolts made of chrome-molybdenum steel, etc. The strength had to be increased by using special steel mounting bolts, which resulted in extremely high costs.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
By reducing the stress acting on the mounting bolts, the mounting bolts remain strong and durable, and
To provide a pulley mounting structure for a washer that reduces the cost by reducing the diameters of the mounting bolts and the rotating shaft of a rotor blade, and using general steel as the material of the mounting bolts, and that also has good installation workability. There is a particular thing.

[Means for solving problems]

In order to achieve the above object, the present invention forms the lower end of the rotating shaft of the rotor blade into a prismatic body with a tapered shape that tapers downward and a horizontally long cross section, and also has a horizontal screw hole in the prismatic body. On the other hand, a tapered square hole that matches the prismatic body and a threaded through hole perpendicular to the prismatic hole are provided in the lower part of the boss part of the pulley, and the prismatic body of the rotating shaft is inserted and fitted into the square hole. , and a mounting bolt is inserted into the screw through hole on the pulley side and the screw hole on the rotating shaft and tightened.

[Effect]

According to the present invention, since the prismatic body at the lower end of the rotating shaft receives most of the torque transmitted from the motor, only a small torque is applied to the mounting bolt, and the mounting bolt moves the pulley in the thrust direction of the rotating shaft. The main role is to support the

In addition, the holes in the prismatic body of the rotating shaft and the boss part of the pulley are tapered, so the rotating shaft and the pulley boss part fit together smoothly, and the rotating shaft and pulley are tightly fitted together. As a result, torque is transmitted reliably without any play.

In addition, since the prismatic body and the hole in the pulley have the same shape and are elongated in cross section, the screw through hole in the pulley and the screw hole in the rotating shaft necessarily match in the same direction, improving the installation workability.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a longitudinal sectional front view showing the main parts of the pulley mounting structure of the washing machine of the present invention, Fig. 2 is an exploded perspective view of the same, and the same components as Figs. 3 and 4 showing the conventional example refer to the same reference. The symbols are attached.

In the figure, reference numeral 1 is a rotary shaft that protrudes from the bottom of the washing tank by attaching rotary blades (not shown) installed at the bottom of the washing tank (not shown). It passes through a stuck bearing (not shown).

The lower end of the rotating shaft 1 has a rectangular prism 1 whose cross section is, for example, an elongated rectangle in which the vertical width A is larger than the horizontal width B.
A, and its side surfaces were sloped to form a tapered shape that narrowed downward as a whole. In addition, the prismatic body 1
a does not necessarily have to be a square, but a modified hexagon,
Other polygons other than octagon may also be used.

Further, a horizontal screw hole 1b is bored in the square prism 1a so as to be perpendicular to the axial direction. It is desirable that this screw hole 1b be provided parallel to the longer width A of the rectangular prism 1a.

On the other hand, the rotary shaft 1 is attached to the boss portion 2a of the pulley 2.
A tapered square hole 2d matching the square prism 1a was provided, and a screw through hole 2b into which the mounting bolt 3 was inserted was laterally bored perpendicular to this hole.

In this way, in order to fix the pulley 2 to the rotating shaft 1, first fix the square prism 1a at the lower end of the rotating shaft 1.
is inserted into the square hole 2d of the pulley 2 and fitted, and the mounting bolt 3 is passed through the threaded through hole 2b of the pulley 2 and further screwed into the threaded hole 1b of the rotation shaft 1 to be tightened and fixed.

Furthermore, as is clear from what has been said above,
When attaching the pulley 2 to the square prism 1a of the rotating shaft 1, since the square prism 1a and the square hole 2d of the pulley 2 are of the same shape, by matching them, the screw through hole 2b of the pulley 2 and Since it necessarily matches the screw hole 1b of the rotating shaft 1, incorrect installation can be prevented and workability for installing the pulley 2 can be improved.

Next, regarding the operation, when the washing motor is in operation, the rotation of the washing motor is transmitted to the pulley 2 via the V-belt, and the rotational torque is transmitted to the boss portion 2a via the square prism 1a of the rotating shaft 1. The torque is transmitted to the lower square hole 2d, and this portion receives the torque applied to the mounting bolt 3 in a distributed manner.

The connection between the rotating shaft 1 and the pulley 2 is facilitated by the square prism 1a of the rotating shaft and the tapered horizontal cross-section of the square hole 2d of the pulley 2, ensuring reliable torque transmission without any play. It is something to do.

[Effect of idea]

As mentioned above, in the pulley mounting structure of the washing machine of the present invention, most of the torque from the washing motor is received by the prismatic body at the lower end of the rotating shaft, and only a small torque is applied to the mounting bolt. Therefore, the diameter of the rotating shaft can be made small. In addition, the mounting bolts can be made of inexpensive general steel, and the cost reduction effect is extremely large.

In this way, the pulley mounting structure is strong and reliable, and has excellent assembly workability such as easy positioning, and ensures reliable torque transmission without any play between the rotating shaft and the pulley. It is something.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of the main parts showing one embodiment of the pulley mounting structure of the washing machine of the present invention, Fig. 2 is an exploded perspective view of the same main parts, and Fig. 3 is a longitudinal sectional front view showing the conventional pulley mounting structure. FIG. 4 is a longitudinal sectional front view of the main parts of the same. 1...Rotating shaft, 1a...square prism, 1b...screw hole, 2...pulley, 2a...boss part, 2b...
...screw through hole, 2c...round hole, 2d...square hole,
3...Mounting bolt, 4...Washing tank, 5...Bearing, 6...Bearing nut, 7...Rotary blade, 8...V
belt.

Claims (1)

[Scope of utility model registration request] The lower end of the rotating shaft of the rotor blade is formed into a prismatic body with a tapered shape that narrows downward and a horizontally long cross section,
Further, a horizontal screw hole is drilled in the prismatic body, and a tapered square hole that matches the prismatic body and a screw through hole orthogonal to the tapered square hole are provided in the lower part of the boss part of the pulley. A pulley mounting structure for a washing machine, characterized in that a prismatic body of a rotating shaft is inserted and fitted, and a mounting bolt is inserted and tightened through a screw through hole on the pulley side and a screw hole on the rotating shaft.