JP2879665B2 - Railcar bogie - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bogie for a railway vehicle, and more particularly, to a structure of a connecting portion between an axle beam of an axle box and a bogie frame in a bogie for a railway vehicle.

[0002]

2. Description of the Related Art In a bogie for a railway vehicle, a mandrel penetrates a fitting hole at a tip end portion of a shaft beam of a shaft box body while both ends are fixed to a bogie frame, and an elastic body has a fitting hole of a shaft beam. And the mandrel, whereby the bogie frame and the axle beam of the axle box are connected to each other while allowing relative displacement therebetween.

[0003] In the conventional bogies for railway vehicles (eg, Patent No. 2
In JP-A-511120, the elastic body is bonded to the annular case and the mandrel so as to prevent slippage between the annular case and the mandrel.

[0004]

In the conventional bogies for railway vehicles, the elastic body is easily damaged due to the adhesion to the shaft beam and the mandrel, and when the elastic body is replaced, the axle box is required. The entire assembly, including the body and the mandrel, needs to be replaced. On the other hand, if the adhesion of the elastic body to the shaft beam and the mandrel is simply omitted, a gap is formed, the elastic body is easily worn, and the life is shortened (for example, see Japanese Patent No. 2511120). Description of the prior art in the column).

An object of the present invention is to provide a bogie for a railway vehicle which overcomes the above problems.

[0006]

A truck for a railway vehicle according to the present invention has the following elements (a) to (d). (A) An axle box (10) including an axle box (22) rotatably supporting an axle (18) and an axle beam (24) extending from the axle box (22). (B) From the axial center It is provided with a pair of diameter change portions (64) that gradually decrease the diameter toward both ends. A fitting hole (28) at the tip of the shaft beam (24).
A mandrel (60) which penetrates through the shaft and is detachably fixed to the bogie frame (46) at the shaft portions (62) at both ends (c) An elastic buffer ring (74) (d) fitted to each diameter changing portion (64) ) The elastic cushioning ring (74) is elastically compressed radially inward by press-fitting the elastic buffering ring (74) into the fitting hole (28).
Annular case (76,
78)

The annular cases (76, 78) are elastically compressed in the radial direction with the press-fit of the shaft beam (24) into the fitting hole (28),
The elastic buffer ring (74) is sandwiched between the mandrel (60) and the annular cases (76, 78). As a result, the elastic buffer ring (74) is integrated with the mandrel (60) and the fitting hole (28) on the inner and outer peripheries, and connects the shaft box (10) and the mandrel (60) to each other while interconnecting the two. Absorb the relative displacement of When replacing the elastic buffer ring (74), pull out the mandrel (60) from the insertion hole (28), remove the annular case (76, 78) from the elastic buffer ring (74), and remove the elastic buffer ring (74). Is released and replaced with a new elastic buffer ring (74). Elastic buffer ring (74)
Is not adhered to the insertion hole (28) of the mandrel (60), the shaft beam (24) or the annular case (76, 78), thereby preventing the occurrence of scratches due to the adhesion and the elastic cushion ring (74) only. Can be replaced and become economical.

According to another bogie for a railway vehicle of the present invention,
The annular case (76, 78) includes a peripheral wall portion (82) covering the mandrel (60) in the radial direction and an end wall portion (84) covering the mandrel (60) in the axial direction.
With the press-fitting of the peripheral wall portion (82) into the fitting insertion hole (28), the end wall portion (84) axially clamps the elastic buffer ring (74) to the diameter changing portion (64). I have.

The annular case (76, 78) is axially integrated with the peripheral wall (82) by press-fitting the peripheral wall (82) into the fitting hole (28), and the end wall (84). ), The elastic buffer ring (74) is pressed against the diameter changing portion (64) of the mandrel (60), and the pinching force of the diameter changing portion (64) between the mandrel (60) and the annular case (76, 78). Enhance.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 5 and 6 are a front view and a plan view of a support structure of the bogie frame 46 to the axle box body 10 in the bogie for a railway vehicle. The axle box body 10 is a holding member that is detachably joined to the axle box body 12 from below by means of the axle box body 12 and bolts 16.
Includes 14 parts. The axle box 10 has an axle box 22 that rotatably supports the axle 18 via a bearing 20, and an axle beam 24 that extends from the axle box 22 in the front-rear direction of the bogie for a railway vehicle. The tip of the shaft beam 24 is an annular portion 26, and a fitting hole 28 is defined on the inner peripheral side of the annular portion 26. The protrusion 30 protrudes upward from the axle box 22 and has a bush 32 fitted therein. The bush retainer 34 is fitted to the convex portion 30 on the upper side of the bush 32, and the bolt 36 is screwed to the top of the convex portion 30 to fix the bush 32 to the convex portion 30 via the bush retainer 34. The anti-vibration rubber 38 and the lower spring seat 40 are fitted to the convex portion 30 in a lower and upper relationship with each other. The upper spring seat 42 is a lower spring seat in the vertical direction.
It faces the bogie frame 46 on the upper surface side while facing the 40. The shaft springs 44 and 45 are contracted between the lower spring seat 40 and the upper spring seat 42 with the center lines thereof aligned with each other inside and outside.
The pair of brackets 48 are welded to the bogie frame 46 so as to sandwich the annular portion 26 of the shaft beam 24 from both left and right sides of the railcar bogie. Each bolt 50 penetrates both ends of the mandrel 60 in the vertical direction from bottom to top, and is screwed to the bracket 48 at the upper end to fix both ends of the mandrel 60 in a separable manner.

FIG. 4 is an exploded view of the mandrel 60 and its assembled parts. The mandrel 60 has shaft portions 62 at both ends in the axial direction. The flange 66 is formed at the center of the mandrel 60 in the axial direction.
On both sides of the shaft through a tapered portion 64 that gradually decreases in diameter toward the end
Continue to 62. A flat portion 68 perpendicular to the radial direction of the mandrel 60 and a flat portion 70 non-parallel to the flat portion 68 are formed on the periphery of each shaft portion 62. Plane parts 68 and 70 are shaft parts
When the shaft 62 is fitted into the fitting hole of the bracket 48, the shaft 62 is positioned in the circumferential direction. The through hole 72 is formed in the shaft portion 62,
The bolt 50 (FIG. 5) is inserted. Each rubber buffer ring 74
Is fitted to the tapered portion 64. The annular cases 76 and 78 are made of steel, and a rubber cushioning ring is provided from outside the mandrel 60 in the axial direction.
A peripheral wall portion 82 and an end wall portion 84 that cover the outer peripheral side and the axially outer side of the rubber buffer ring 74 are provided over the rubber buffer ring 74, respectively.

FIGS. 2 and 3 are a partial sectional view showing the assembled state of the mandrel 60 and its assembled product as viewed from the front and an axial view. The outer diameter of the annular case 78 is slightly larger than the outer diameter of the annular case 76, and the annular cases 76 and 78 receive the rubber buffer rings 74 on the inside and fit the peripheral edges on the tip side to each other. Rubber cushion ring 74
6, 78 and the mandrel 60 are compressed so as to be sandwiched between the tapered portion 64 and the annular cases 76, 78.

FIG. 1 shows the assembled part of FIG.
FIG. 26 is a view showing a state in which the fitting holes 28 are assembled in 26. Annular case 7
6, 78 are press-fitted into the fitting hole 28, and at this time, although being made of steel, the peripheral wall 82 is almost elastically compressed within a range of substantially elastic deformation, and is engaged with the fitting hole 28 on the outer peripheral surface of the peripheral wall 82. State. The annular cases 76 and 78 further compress the rubber buffer ring 74 in the radial direction and the axial direction on the inner surface side of the peripheral wall portion 82 and the end wall portion 84, respectively.
Between the tapered portion 64 and the annular case 76.
The press-fitting and engagement of the annular cases 76 and 78 into the fitting holes 28 prevents the annular cases 76 and 78 from being removed from the shaft beam 24 during operation of the railway vehicle. The retaining ring 80
It is detachably fixed to the entrance side of the fitting hole 28, and the fitting hole
The ring cases 76 and 78 are securely prevented from coming off from the hole 28.

When replacing the rubber buffer ring 74, the retaining ring 80 is removed from the fitting hole 28 and a large operating force is applied.
The annular cases 76 and 78 are removed from the fitting holes 28 and further removed from the rubber buffer ring 74. As a result, the rubber buffer ring 74 is released from the clamping pressure, and then the rubber buffer ring 74 is removed from the mandrel 60 and replaced with a new one.

[Brief description of the drawings]

FIG. 1 is a view showing a state where the assembled product of FIG. 2 is assembled in a fitting hole of an annular portion of a shaft beam.

FIG. 2 is a partial cross-sectional view showing an assembled state of a mandrel and an assembled product thereof from a front direction.

FIG. 3 is a diagram showing an assembled state of a mandrel and an assembled product thereof as viewed from an axial direction.

FIG. 4 is an exploded view of the mandrel and its assembled product.

FIG. 5 is a front view of a supporting structure of a bogie frame to a shaft box in a bogie for a railway vehicle.

FIG. 6 is a plan view of a support structure of a bogie frame to a shaft box in a bogie for a railway vehicle.

[Explanation of symbols]

 Reference Signs List 10 axle box 18 axle 22 axle box 24 axle beam 28 fitting hole (fitting insertion hole) 46 bogie frame 60 mandrel 62 shaft portion 64 taper portion (diameter change portion) 74 rubber buffer ring (elastic buffer ring) 76, 78 Annular case 82 Peripheral wall 84 End wall

Claims (2)

(57) [Claims] 1. An axle box body (10) comprising an axle box (22) for rotatably supporting an axle (18) and an axle beam (24) extending from the axle box (22). b) a pair of diameter change portions (64) that gradually decrease in diameter from the center in the axial direction toward both ends, the pair of shafts having both ends passing through the insertion holes (56, 76) at the tip of the shaft beam (24); A mandrel (60) that is detachably fixed to the bogie frame (46) at the part (62),
(C) an elastic cushioning ring (74) fitted to each of the diameter change portions (64);
And (d) covering the elastic buffer ring (74) with the fitting hole (2
8) an annular case (76, 78) that is elastically compressed radially inward by press-fitting to put the elastic buffer ring (74) between the diameter-changing portion (64) and the elastic buffer ring (74). A bogie for railway vehicles. The annular case (76, 78) is provided with the mandrel (6, 78).
0), a peripheral wall portion (82) covering the outside in the radial direction, and an end wall portion (84) covering the outside in the axial direction of the mandrel (60), and the fitting hole (28)
The elastic cushioning ring (74) is axially clamped to the diameter changing portion (64) by the end wall portion (84) with the press-fitting of the peripheral wall portion (82) into the peripheral wall portion (82). The bogie for a railway vehicle according to claim 1.