JPS5812199B2 - Swivel wheel device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a swing wheel device for, for example, a traveling industrial machine, a swing jib hoist, or the like.

First, a conventional swing wheel device shown in FIG. 1 will be explained.

The outer ring 1 is attached to the bottom of the rotating body frame 2 with bolts 3 and nuts 4.
An inner ring 5 having inner teeth 5a is fixed on a base frame 6 by a plurality of bolts 7, and steel balls 8 are provided on the same circumference on the fitting surface of the outer ring 1 and the inner ring 5. It is being

Although not shown, the rotating body frame 2 supports a rotating pinion that meshes with internal teeth 5a, so that the rotating body frame 2 is configured to rotate on the base frame 6.

The base frame 6 and the rotating body frame 2 are disassembled and assembled by removing and attaching a large number of bolts 7, which are fastening means for the inner ring 5 and the base frame 6.

It takes a lot of time to remove and install it, and it is troublesome because it requires a tightening torque of more than a certain value at the time of installation.

In order to facilitate this disassembly and assembly, a structure has been proposed in which the inner ring 5 is bolted to the base frame 6 via several clamps, except for the screw holes for the bolts in the inner ring 5, but this is not very effective.

In addition, a plurality of σ lugs are provided protruding from the outer ring, and a U-shaped presser body that can be fitted to each lug is fixed to the frame of the revolving body, and the presser foot is fitted to each lug so that they can be rotated together. A rotating wheel device in which the wheels are pinned along the tangential direction has been disclosed (Japanese Patent Laid-Open No. 125450/1983).

In this device, since there is no radial positioning means for aligning the pin holes, the upper rotating structure must be re-hanged many times to align the pin holes, and as a result,
It takes a lot of time to assemble the crane body.

The present invention is intended to eliminate the above-mentioned drawbacks, and has steel balls interposed between an outer ring fixed to the rotating body frame and an inner ring provided with internal teeth, which is fixed to the inner rotating body frame. In the swivel wheel device, a tapered surface is formed on either the inner or outer periphery of the fixed ring fixed on the basic frame, and the tapered surface of the fixed ring is formed on the skirt portion provided to protrude below the inner ring. form a Z-tapered surface that matches the surface,
Both of the tapered surfaces constitute a mating part that is aligned and low-fitted in a state in which the inner ring is in close contact with each other by simply hanging down the inner ring, and a plurality of pins that radially penetrate the two are attached to the mating part in the close contact state. A hole is drilled and a bottle is removably fitted into the bottle hole so that the two can be separated and connected.

Further, in the present invention, the inner circumferential surface of an annular band along the outer circumference of the skirt portion of the inner ring is applied to the outer end surface of each of the pins, and the annular band is fixed to each pin using a fixture.

Next, one embodiment of the present invention will be explained with reference to FIGS. 2 and 3.

The outer ring 1 is attached to the rotating body frame 2 with bolts 3 and nuts 4, as in the conventional case.

The inner ring 5 is formed with a skirt portion 5b that projects downward, and a tapered surface 5c is provided on the inner peripheral surface of the skirt portion 5b.

A fixed ring body 9 having a tapered surface 9a that matches the tapered surface 5c is attached to the base frame 6 by welding or bolting, and the tapered surface 5c of the skirt portion 5b and the tapered surface 9a of the fixed ring body 9 and are fitted together.

A plurality of pin holes are formed radially in the fitting part between the skirt part 5b and the fixed ring body 9 by simultaneous machining, and pins 10 are arranged in both pin holes at intervals on the same circumference. It's embedded.

An annular band 11 is applied to the outer end surface of each pin 10, and the annular band 11 is connected to each pin 10 by a bolt 12.

The annular band 11 and the bolt 12 prevent the pin 10 from coming off.

A steel ball 8 is provided on the fitting surface between the outer ring 1 and the inner ring 5, as in the conventional case.

When disassembling, loosen the bolts 12, remove the annular band 11, and pull out the pin 10.

As a result, there is nothing connecting the inner ring 5 and the fixed ring 9, and the inner ring 5 can be separated from the outer ring 1 very easily.

When assembling, since tapered surfaces 5c and 9a are provided on the fitting surface between the skirt portion 5b of the inner ring 5 and the fixed ring body 9, the inner ring 5 positioned almost above the fixed ring body 9 is suspended. This will automatically correct misalignment.

Therefore, alignment can be easily performed.

This embodiment shows a configuration in which the tapered surface 5c of the inner ring 5 is in close contact with the tapered surface 9a of the fixed ring 9, and the lower end surface of the skirt portion 5b of the inner ring 5 is in contact with the receiving surface of the fixed ring 9. .

This embodiment would be difficult to machine and therefore more expensive to manufacture.

However, the horizontal load is received by the tapered surfaces 5c and 9a, and the downward load is received by the lower end surface of the skirt portion 5b and the receiving surface of the fixed ring body 9 that is in contact with the lower end surface of the skirt portion 5b.

Therefore, since the pin 10 is not subjected to a downward load of the vertical load generated from the moment load applied to the swing ring, it does not act as an alternating load in the vertical direction and only a unilateral swing load is applied. The diameter can be made smaller, and since the diameter of the pin 10 can be made smaller based on the length of the skirt portion 5b and the height of the fixed ring 9, the overall height can be lowered. There are great advantages that can be achieved.

FIG. 4 shows an embodiment of a normally implemented configuration in which a gap is provided between the lower end surface of the skirt portion 5b and the receiving surface of the fixed ring body 9 opposing thereto for manufacturing reasons. Items with the same reference numerals as in Figure 2 represent the same or equivalent items.

In this embodiment, compared to the embodiment shown in FIG. 2, the contact surface between the skirt portion 5b and the fixed ring body 9 is only a tapered surface,
Manufacturing and machining are easy.

However, the tapered surfaces 5c and 9a are subjected to horizontal and vertical loads, and the pin 10 that connects the inner ring 5 and the fixed ring body 9 is subjected to alternating downward and upward loads, and the diameter of the pin 10 is It is correspondingly larger than the one in Fig. 2, where only the upward load is applied.

In FIG. 5, a tapered surface 5e is provided on the outer periphery of the skirt portion 5b,
This figure shows an embodiment in which a tapered surface 9d is provided on the inner periphery of the fixed ring body 9, and the same reference numerals as in FIGS. 2 and 4 represent the same or equivalent parts.

According to the present invention described above, since the fitting surface portion with the tapered surface is formed on the skirt portion of the inner ring and the fixed ring body, it is possible to easily align the radial direction of the swing ring.

Therefore, the effort required for assembling and disassembling the swing wheel device can be significantly reduced, and the trouble associated with bolt tightening torque during assembly can be eliminated.

In addition, the state upon reassembly can always be the same as the state before disassembly.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing a part of a conventional swing wheel device, FIG. 2 is a cross-sectional side view showing a part of an embodiment of the present invention, and FIG. 3 is a cross-sectional plane of the embodiment of FIG. 4 and 5 are cross-sectional side views showing portions of different embodiments of the invention. 1...Outer ring, 2...Swivel frame,
3... Bolt, 5... Inner ring, 5a...
...Inner tooth, 5b...Skirt part, 5c, 5
d, 5e...Tapered surface, 6...Base frame, 8...Steel ball, 9...Fixed ring body, 9a, 9c, 9d... ...Tapered surface, 10...
... Pin, 11 ... Circular band, 12 ...
·bolt.

Claims (1)

[Scope of Claims] 1. In a swinging wheel device in which a steel ball is interposed between an outer ring fixed to a rotating body frame and an inner ring equipped with internal teeth, the inner circumference of a fixed ring fixed on a basic frame or A tapered surface is formed on one side of the outer periphery, a tapered surface that matches the tapered surface of the fixed ring is formed on a skirt portion provided to protrude below the inner ring, and both tapered surfaces hang down the inner ring. The two constitute a fitting part that is aligned and fitted in close contact with each other, and a plurality of pin holes are drilled radially through the two in the tightly fitted fitting part. A swing wheel device characterized in that a pin is removably fitted so that the two can be separated and connected. 2. In a swing wheel device in which a steel ball is interposed between an outer ring fixed to the swing body frame and an inner ring equipped with inner teeth, a fixed ring fixed to the base frame is attached to either the inner or outer periphery. A tapered surface is formed, and a tapered surface that matches the tapered surface of the fixed ring is formed on a skirt portion provided to protrude downward from the inner ring, and both the tapered surfaces are in close contact with each other simply by hanging the inner ring. A fitting part is formed that is aligned and fitted in a state, and a plurality of pin holes are drilled radially through the two in the fitting part in a close contact state, and a pin is removably fitted into the pin hole. In addition, the inner peripheral surface of an annular band along the outer circumference of the skirt of the inner ring is applied to the outer end surface of each pin, and the annular band is fixed to each pin using a fixture. A rotating wheel device characterized by: