JPS597610Y2 - Nut's rotation stopper - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to preventing rotation of a nut, and more particularly, to preventing rotation of a nut screwed onto the end of the final reduction shaft of a tracked vehicle.

Conventionally, for example, as shown in Fig. 1, the detent of the nut }c screwed onto the shaft end threaded portion b' of the final reduction shaft b of the final reduction gear a is a detent punched by press as shown in Fig. 2. Watsusha d
is tightened with a nut C to the bearing holder e that is in contact with the inner ring f' of the bearing f, and at the same time tighten the anti-rotation washer d.
is bent and abutted against nut C to prevent rotation.

However, with this structure, the detent washer d is a press punched product, so there may be some sagging (0.1 to 0.3 mm).
In other words, it has a slightly uneven waveform deformed portion.

For this reason, even if nut C is tightened to the specified torque, the detent washer d does not come into close contact with the fixed side e, but only partially, so a concentrated load acts on that part (the sagging part), and this concentrated load This part gradually wears away during operation, causing play in the bearing holder e and causing accidents such as the inner ring f' of the bearing f slipping or the nut C loosening.

The present invention was developed in view of the above circumstances, and its purpose is to provide a nut rotation prevention device that can reliably prevent the nut from loosening over a long period of time.

Embodiments of the present invention will be described below with reference to FIG. 3 and subsequent figures.

One end of the final reduction shaft 3 rotatably supported within the final reduction gear case 1 via a bearing 2 penetrates the cylindrical shape 4 and protrudes to the outside, and a threaded portion 5 is cut into the shaft end. At the same time, a cutout groove 9 that is open to the circumferential surface is cut out.

Then, a cylindrical bearing holder 6 is fitted to the final reduction shaft 3 via a key 7, and one end surface 6a of the cylindrical bearing holder 6 is connected to the bearing holder 2.
It abuts against the inner ring 2a and is pressed against the stepped portion 3a.

Reference numeral 8 denotes a nut, which is screwed onto the threaded portion 5 so that its inner end surface 8a tightens and fixes the bearing holder 6, and the nut 8 has a groove 1 on its circumferential surface for hooking a spanner.
A large number of 0's are cut out at intervals, and the outer end surface 8b
Eight screw holes 11 are drilled at 45-degree intervals.

Reference numeral 12 denotes a rotation stopper plate, which is a thick annular plate, on the inner periphery of which tongue pieces 13 are integrally formed, and ten bolt holes 14 are drilled in the circumferential direction concentrically with the screw holes 11. be.

The arrangement of the ten bolt holes 14 is such that the l-th bolt hole 14 is located at a position offset by 2 degrees with respect to the center line 13a of the tongue piece 13.
a, and 14b...14e are sequentially arranged and drilled at equal intervals of 40° from the first bolt hole position,
Then, the sixth bolt hole 14f is connected to the first bolt hole 14a.
The holes are perforated at 180°, that is, at opposing positions.

Furthermore, 14 g bolt holes are provided at 40° intervals from the sixth bolt hole.
......14 j is perforated.

This arrangement creates 10 bolt holes 14a...
...14j are arranged and perforated at opposing positions, respectively.

The anti-rotation plate 12 is aligned with the outer end surface 8b of the nut 8, and the tongue piece 13 is fitted into the notch groove 9.
The nuts are rotated so that two of the bolt holes 14 at opposite positions are aligned with one of the threaded holes 11 of the nut 8 by a minimum amount, and then a pair of bolts 15, 15 are attached. It is tightened and fixed.

In aligning the rotation stopper plate 12 and the nut 8, the present invention pays special attention to minimize the amount of adjustment.The details are explained in FIG. 4. The maximum deflection angle when the nut 8 is tightened is 22+°.

Further, the maximum deviation angle between the nut 8 and the rotation stopper plate 12 is 5°.

In order to match this amount of deviation, a bolt hole 14a is drilled at a position deviated by 2-}° with respect to the tongue piece 13 of the detent plate 12, and by aligning the front side and the upside down state, the above-mentioned It becomes possible to adjust the angle by 5 degrees, and the adjustment can be achieved by simply moving the nut 8 within 2+ degrees.

Reference numeral 16 is a stopper for the bolt 15, and is made of a half-moon-shaped plate, with two bolts 15, 15 at each end.
Bolt holes 16a and 16b are drilled at 180° positions concentrically with the screw hole 11 of the nut 8 in accordance with the opposing tightening positions.

After aligning with the rotation stopper plate 12, they are tightened together, and the respective edges are bent to abut against the head of the bolt to prevent the bolt from loosening.

Further, 17 is a cap that protects and covers the nut 8,
It is tightened and fixed to the cylindrical body 4 with bolts 18.

Since the tongue piece 13 of the anti-rotation plate 12, which is fastened to the nut 8 with the bolt 15, fits into the notch 9 cut into the threaded part 5, the nut 8 does not loosen and is securely prevented from rotating. can.

In addition, since the rotation stopper plate 12 is machined into a thick annular plate, the end surface that comes into contact with the outer end surface 8b of the nut 8 is smooth and does not sag.

Therefore, the anti-rotation plate 12 and the outer end surface 8b of the nut 8 can be brought into close contact with each other, so that there is no partial contact and no concentrated load is applied, and the load is applied uniformly to the entire surface, so there is no wear even after long-term use. This prevents the nut 8 from loosening and the bearing presser 6 from rattling.

In particular, since the tightening bolts 15 are always tightened at opposing positions of 180 degrees, they are securely tightened and will not loosen over a long period of time.

Since the present invention is constructed as described above, the anti-rotation plate 12 is in the shape of a thick plate and has the tongue piece 13 that fits into the notch groove 9 cut in the threaded part 5, so there is no need to bend it. nut 8
The end surface that contacts the outer end surface 8b of the nut 8 can be made into a smooth surface without sagging by machining, and the outer end surface 8b of the nut 8 can be densely grown.

Therefore, loosening of the nut 8 can be prevented for a long period of time.

In addition, since a plurality of screw holes 11 of the nut 8 and bolt holes 14 of the detent plate 12 are provided in a specific positional relationship, the nut 8 can be rotated at a minute angle by turning the detent plate 12 upside down and fitting it. Screw hole 1 just by rotating
1 and the screw hole 14 can be matched.

Therefore, no matter what tightening angle position the nut 8 is in, the rotation stopper plate 12 can be easily and quickly tightened and fixed to the nut 8, and the assembly work can be speeded up.

Also, since it is only necessary to cut one notch groove 9 into the threaded part 5,
The processing is easy, and the strength of the threaded portion 5 is not reduced.

In addition, the rotation prevention plate 12 is a thick annular plate that reliably contacts the entire circumference of the nut 8, and the rotation prevention plate 12 is tightened by a pair of bolts 15 facing each other in the diametrical direction. The rotation plate 12 is securely and firmly tightened and fixed to the nut 8 in a stable state, and does not loosen even when the tongue piece 13 receives a rotational force, and performs a loosening prevention function for a long period of time.

In addition, since there is only one notch groove 9 and one tongue piece 13, it is only necessary to attach the rotation prevention plate 12 by fitting the tongue piece 13 into the notch groove 9, making the installation work simple and easy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional example, Fig. 2 is a partially enlarged sectional view thereof, Fig. 3 is an overall sectional view showing an embodiment of the present invention, Fig. 4 is a front view as seen from IV, and Fig. 5 is a sectional view of the conventional example. FIG. 6 is a front view of the nut, FIG. 6 is a front view of the stopper plate, and FIG. 7 is a front view of the bolt stopper. 3 is the shaft, 5 is the screw part, 9 is the notch, 11 is the screw hole, 12
13 is a tongue piece, 14 is a bolt hole, and 15 is a bolt.

Claims (1)

[Scope of utility model registration request] To prevent rotation of the nut 8 screwed onto the threaded portion 5 of the shaft 3, one notch groove 9 is cut in the threaded portion 5, and
The anti-rotation plate 12, which is a thick annular plate having one tongue piece 13 that fits into the notch groove 9, is fitted into the threaded portion 5, and the bolt 15 of the anti-rotation plate 12 is inserted into the screw of the nut 8 from the bolt {L14. Screw the anti-rotation plate 12 into the hole 11 with the nut 8
At the same time, the screw holes 11 of the nut 8 are perforated at equal intervals in the circumferential direction, or the rotation prevention plate 1 is fixed.
2 bolt holes 14 in the circumferential direction 14a to 14j
and the first to fifth bolt holes 14a to 14e are 4
0 degree interval, 5th bolt hole 14 e and 6th bolt hole 14
f and 20 degrees apart, 6th to 10th bolt holes 14 f to 1
4j at 40 degree intervals, the tenth bolt hole 14j and the first bolt hole 14a at 20 degree intervals, and the tongue piece 1
3 from the center of the first bolt hole 14 a to the second bolt hole 14
The anti-rotation plate 12 is provided at a position shifted by 25 degrees toward the b side, and is fixed by tightening a pair of bolts 15 into the screw holes 11 through a pair of bolt holes 14 facing each other in the diametrical direction. Prevents rotation of the nut.