JPS624717Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a blade reversing device for a reversible fan that can reverse the direction of air blowing by changing the angle of the blade.

BACKGROUND TECHNOLOGY A reversible fan is known as a fan used in the cooling system of an internal combustion engine, in which the direction of air blowing can be reversed by changing the angle of the blades. A blade reversing device was adopted. That is, the base end of the blade shaft c is inserted into the cylindrical part b provided around the hub a, and the retaining ring e is inserted into the small diameter part d formed at the base end of the blade shaft c. At the same time, the protrusion f protruding from the outer periphery of the retaining ring e is engaged with one notch g of the cylindrical part b, so that the angle of the blade h attached to the blade shaft c is kept constant. It is maintained so that When changing the angle of the blade h from the position shown by the solid line in Figure 2 to the position shown by the broken line, push the blade shaft c against the spring and tighten the retaining ring e.
is pushed out from the cylindrical part b, and in this state, the blade shaft c is rotated until the protrusion f of the retaining ring e matches the other notch i, then the retaining ring e is accommodated in the cylindrical part b again and the blade is removed. h as a broken line (see Figure 2)
Configured to hold at an angle.

Problems that the invention aims to solve However, in a reversible fan that uses the above-mentioned reversing device, when used for a long period of time, mud and rust may build up in the notch e' of the retaining ring e, as shown in Figure 3. The deposits tend to accumulate, and if the blade h is reversed in this state, the retaining ring e rides on the deposits and is damaged. Furthermore, with the conventional retaining ring e, if excessive force is applied and the gap between the open parts expands, the blade h
There was also a problem where the retaining ring e fell off from the blade shaft c and was lost when the blade was reversed.

This invention was made for the purpose of improving this problem.

Means and operation for solving the problem A plurality of cylindrical parts are formed at equal intervals on the outer periphery of the hub, and a blade shaft having a blade at the tip is rotatably inserted into these cylindrical parts. The base end is locked by a retaining ring having protrusions on the outer periphery that can be selectively engaged with a plurality of notches formed in the cylindrical part 2, and the retaining ring and the seat surface of the cylindrical part are interposed between the retaining ring and the seat surface of the cylindrical part. A lock plate large enough to cover the seat surface is attached to the seat, and the claws folded out from the lock plate are locked to the retaining ring so that they can rotate together, thereby preventing deposits from forming in the notch of the retaining ring. To provide a blade reversing device for a reversible fan, which is provided with a locking plate that prevents the retaining ring from being damaged by riding on soil and sand, and also prevents the retaining ring from falling off the blade shaft.
A reversible fan blade reversing device designed to prevent the retaining ring from being damaged or lost.

Embodiment This invention will be described in detail with an embodiment shown in FIG. A proximal end side of a blade shaft 4 having a blade 3 attached to the distal end thereof is inserted into the portion 2 against a spring 10. For example, a rectangular small diameter portion 4a is formed on the base end side of the blade shaft 4, and a retaining ring 5 is inserted into this small diameter portion 4a from a direction perpendicular to the axis.

The retaining ring 5 has a notch 5a that can be fitted into the small diameter portion 4a, and a protrusion 5b that can be selectively engaged with the two notches 2a and 2b formed in the cylindrical portion 2 on the outer periphery. At the same time, a lock plate 6 is installed above the retaining ring 5 from below the blade shaft 4.
is inserted. The lock plate 6 is a disc large enough to cover the seat surface 2c of the cylindrical portion 2, and is provided so as to be in close contact with the upper surface of the retaining ring 5. The lock plate 6 is provided at the tip of a claw body 6a that is folded up from the outer periphery. is locked to the outer peripheral edge of the retaining ring 5 near the protrusion 5b, so that it can rotate together with the retaining ring 5.

Effects of the invention As detailed above, this invention prevents dirt, rust, etc. from accumulating in the notch of the retaining ring because the locking plate installed above the retaining ring closes the seat surface of the cylindrical part when in use. Even if the blade shaft is pushed against the spring and the blade is reversed, the accumulated dirt and rust will move together with the retaining ring, so there is no risk of the retaining ring being damaged by the deposits, and the lock plate This improves the fit between the retaining ring and the cylindrical portion, so the machining accuracy of the retaining ring may be lower than that of conventional retaining rings, making it easy to manufacture and inexpensive. Furthermore, when the retaining ring is pushed out from the cylindrical portion and the blade is reversed, the lock plate prevents the retaining ring from falling off, thereby preventing loss of the retaining ring.

[Brief explanation of the drawing]

1 to 3 are explanatory views of the conventional device, FIG. 4 is a front view showing an embodiment of the invention, FIG. 5 is a sectional view of the same, and FIG. 6 is an exploded perspective view of the main parts. 1 is a hub, 2 is a cylindrical part, 2a and 2b are notches,
2c is a seat surface, 3 is a blade, 4 is a blade shaft, 5 is a retaining ring, 5b is a protrusion, 6 is a lock plate, and 6a is a claw body.

Claims (1)

[Scope of utility model registration request] A plurality of cylindrical parts 2 are formed at equal intervals on the outer periphery of the hub 1, and a blade shaft 4 having a blade 3 at the tip is rotatably inserted into these cylindrical parts 2, so that the base end of the blade shaft 4 is rotated. A retaining ring 5 having protrusions 5b selectively engageable with the plurality of notches 2a and 2b formed in the cylindrical portion 2 is engaged with the retaining ring 5 on the outer periphery, and the retaining ring 5 and the seating surface of the cylindrical portion 2 are engaged with each other. 2c, there is a lock plate 6 large enough to cover the seat surface 2c.
This is a blade reversing device for a reversible fan, in which a claw body 6a folded up from a lock plate 6 is locked to a retaining ring 5 so that they can rotate together.