JPH05131801A - Wheel and axle for rolling stock - Google Patents

Abstract

PURPOSE:To correctly position wheels to a carriage frame without using a special tool by providing a projection to the pressedly fitting part of each wheel so that the wheel can be abutted on the wheel seat end part of the axle. CONSTITUTION:Two wheels 1 are pressedly fitted in the wheel seats 3 provided on an axle 2. On the axle end side of a wheel boss 8 that has been provided for pressedly fitting the wheel 1, a positioning projection 4 having a positioning surface 5 that is parallel to the back surface 6 of the wheel flange is provided. In this case, the dimensions C, E1, and E2 of the axle 2 are previously accurately machined in a single state, and also the dimension D of the wheel 1 is accurately machined in a single state. Thus, when the wheels 1 are pressedly fitted in the axle 2, so long as each wheel is pressedly inserted until the positioning projection 4 is brought into closely contact with the positioning surface, the wheels 1 can be pressedly fitted in the correctly parted positions to the axle 2, even if the positioning and measurement by means of any tool is not carried out, and the dimensions A1, A2 as well as the dimension B can be maintained to be sufficiently accurate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle for a railway vehicle, and more particularly to an axle for an railway vehicle used at high speed.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a conventional railway vehicle wheel axle. In the conventional example, the wheel 18 was press-fitted and positioned with respect to the axle 19 by a cylindrical press-fitting surface having no protrusion or recess.

For this reason, the positioning of the wheel 18 when press-fitting it into the axle 19 is performed by securing the dimension B between the flange back surfaces 6 of the wheel 18 by means of a jig provided separately. If it is only the relative relationship with, it suffices to strictly control only the B dimension in this way.
However, in such conventional management, the dimensions A1 and A2 between the end surface of the axle 19 and the flange back surface 6 of the wheel 18 are used.
There was a problem in that there was no choice but to make a big difference depending on the variations.

That is, when the wheel shaft is positioned with respect to the bogie, the wheel shaft is not positioned with respect to the bogie on the bogie side with reference to the flange back surface of the wheel, and the end surface of the axle on which the journal bearing is mounted is Since they are mounted with reference to each other, the difference between the above-described dimensions A1 and A2 immediately appears as a positioning error of the wheel flange back surface with respect to the carriage.

In order to prevent such a problem, in the assembly of the conventional high-speed bogie, the position of the wheel flange back surface was marked on the surface plate, and the wheel shaft was placed in the correct position and fixed to the bogie frame.

The details are shown in FIGS. FIG. 8 shows 1
It shows a state in which the wheels 18 and axles 19 for the carriage are arranged at the correct positions with respect to the rail 21. In this state, the wheels 18
The contact point 22 where the rail and the rail 21 contact is an accurate rectangular ABC
Shape D. A specific procedure for measuring dimensions is A-
Check that the dimension between C and the dimension between B and D are equal and within the specified tolerance, and that the difference between the dimension between A and D and the dimension between B and C (diagonal dimension difference) is within the specified value. There is.

On the other hand, the bogie frame 24 to which these wheel shafts are attached is precisely machined after welding and assembling, and the scribe marks centers I, J, K and L corresponding to the centers of the respective axle boxes are sufficient for the wheels 18 and the rails 21. It is within the accuracy required for the contact points A, B, C, D.

However, the dimensional accuracy of A1 and A2 shown in FIG.
When the axle box 20 is positioned with respect to the bogie frame 24 via the axle rubber 30 on the basis of the machining surface of No. 4, there is a problem that the wheel 18 is not correctly arranged on the rail 21.

In order to solve this point, when the bogie is assembled, the wheel axle incorporating the axle box 20 and the axle rubber 30 is correctly positioned on the surface plate 31 as shown in FIG. After that, the bogie frame 24 suspended by the rope 26 is put down on the bobbin frame 24, and the shaft spring seat 27 and the shaft rubber upper seat 29 provided on the bogie frame 24 are connected by bolts 28 to assemble them.

The contact surfaces of the shaft spring seat 27 and the rubber upper seat 29 are machined to each other, and bolt holes and the like can be assembled so as to absorb the assembly tolerance (difference between A1 and A2 dimensions) of the wheel shaft. There is a margin. The adjusting screw 33 of the wheel positioning seat 32 is used for fine adjustment when the wheel shaft is correctly positioned on the surface plate.

In order to assemble the bogie by the above steps,
When assembling, a wheel positioning jig is required. Further, even when the trolley in use is disassembled for some reason, it is necessary to carry it to the place where the jig is and assemble it when reassembling.

[0012]

In the above-mentioned prior art, the dimensional accuracy of the wheel axle is not sufficiently secured, and a jig for that purpose is required when the bogie is assembled.

An object of the present invention is to improve the positioning accuracy of the wheel shaft with respect to the bogie frame so that the wheel shaft can be correctly positioned with respect to the bogie frame without using a special jig. That is, the assembling accuracy of the wheel set itself is increased without using a special jig.

[0014]

As means for achieving the above object, the present invention provides a positioning effect by providing a protrusion on a wheel press-fitting portion and contacting it with a wheel seat end portion provided on an axle. is there.

[0015]

[Operation] If the wheel seat end of the axle is machined with high precision and the space between the wheel flange back surface and the protrusion provided in the wheel press-fitting hole is precisely machined, a special jig can be used. Even if it is not necessary, an accurate wheel axle can be obtained simply by assembling the wheel axle.

[0016]

FIG. 1 shows an embodiment of the present invention. 2 is shown in FIG.
It is an enlarged view of the press-fitting part in FIG.

The two wheels 1 are press-fitted into a wheel seat 3 provided on the axle 2. Wheel boss 8 provided for press-fitting the wheel 1
A positioning protrusion 4 having a positioning surface 5 parallel to the wheel flange back surface 6 is provided on the axle end side of the.

In this embodiment, the axle 2 is precisely machined in the C, E1, and E2 dimensions, and the wheel 1 is also individually machined in the D dimension with precision. When the wheel 1 is press-fitted, the wheel 1 is press-fitted to the axle 2 in the proper distribution position by press-fitting until the positioning protrusion 4 comes into close contact with the positioning surface without any positioning or measurement by a jig. Not to mention A1, A2
The dimensions are maintained with sufficient accuracy.

Generally, the press-fitted portion of the wheel into the axle is the most strict condition in terms of axle strength, and fatigue cracks sometimes occur in the axle at the wheel press-fitted portion. However, in this embodiment, no notch or groove is formed in the press-fitted portion of the wheel, and therefore, the fatigue strength of the axle is not adversely affected.

Another embodiment of the present invention is shown in FIG. In this embodiment, the tapered surface 10 is provided instead of the vertical surface provided at the wheel seat end, and the position of the wheel is determined by this surface, and the effect is the same as in the previous embodiment.

Another embodiment of the present invention is shown in FIG. In the present embodiment, the flange 1 provided on the wheel boss 11 part
2 is fixed to the wheel boss 11 with a bolt 13 and can be removed by loosening the bolt 13, which has an effect that the present invention can be applied even when there is no space.

5 and 6 show still another embodiment, and FIG. 5 shows a case where a wheel seat provided on the axle 15 is provided with a step. The effect is the same as the other embodiments.

FIG. 6 shows an embodiment in which a notch 17 is provided on a protrusion provided on the wheel boss 16. As a result, the weight of the wheel can be reduced, but the effect is the same as the other embodiments.

[0024]

The following effects can be expected by applying the present invention.

1. The wheels are accurately positioned with respect to the axles, eliminating the need for a special assembly jig when attaching the axles to the bogie.

2. In high-speed trucks, the positioning accuracy of the wheels is improved and the running performance is improved.

3. It does not adversely affect the strength of the press-fitted portion of the wheel into the axle.

4. When the wheel press-fitting work is performed, it is not necessary to press-fit the wheel while measuring the dimension between the flange backs, and the work becomes easier.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of the press-fitting portion of FIG.

FIG. 3 is an enlarged view of a press-fitting portion showing another embodiment of the present invention.

FIG. 4 is an enlarged view of a press-fitting portion showing another embodiment of the present invention.

FIG. 5 is an enlarged view of a press-fitting portion showing still another embodiment of the present invention.

FIG. 6 is an enlarged view of a press-fitting portion showing still another embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing an embodiment according to the prior art.

FIG. 8 is a plan view showing a wheel axle in a conventional bogie assembly method.

FIG. 9 is a plan view showing a bogie frame in a bogie assembly method according to a conventional technique.

FIG. 10 is a side view showing a method of assembling a bogie according to a conventional technique.

[Explanation of symbols]

1 ... Wheel, 2 ... Axle, 3 ... Wheel seat, 4 ... Wheel positioning protrusion, 5 ... Positioning surface, 6 ... Flange back surface, 7 ... Wheel flange, 8 ... Wheel boss, 9 ... Wheel tread surface, 10 ... Tapered surface, 11 ... Wheel boss, 12 ... Flange, 13 ... Bolt, 14 ... Wheel boss, 15 ... Axle, 16 ... Wheel boss, 1
7 ... Notch.

Claims (4)

[Claims] 1. A wheelset for a railroad vehicle, wherein a wheelset of a wheelset for a railroad vehicle having a fixed axle is press-fitted into an axle of the wheel, wherein a projection is provided on an inner diameter portion of the wheel for press-fitting the axle on the side opposite to the flange. 2. The wheelset for a railcar according to claim 1, wherein a surface of a projection provided in a wheel axle press-fitting hole of the wheel is closely contacted with the axle by a tapered surface. .. 3. The wheelset for a railway vehicle according to claim 1 or 2, wherein the projection provided in the axle press-fitting hole of the wheel is attachable / detachable by a fastening means separately provided to the wheel boss. And axles for railway vehicles. 4. A flange having a plane parallel to a wheel flange back surface is provided in an inner diameter portion of a wheel axle press-fitting hole of a wheeled vehicle for a railway vehicle having a fixed axle into an axle, the inner diameter portion being opposite to the flange side of the wheel axle press-fitting hole. A wheel axle for a rail vehicle, wherein the parallel flange is in close contact with an end surface of a wheel press-fitting wheel seat provided on the axle.