JP2016164008A - Truck for railway vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a truck for a railway vehicle including axle-box suspensions which enable reduction of the number of components and assembly work hours.SOLUTION: A truck for a railway vehicle includes: a truck frame 12; a wheel set comprising wheels and an axle; axle box bodies which hold the wheel set so that the wheel set may roll; and axle spring gears 14, each of which connects the truck frame 12 to the axle box body. Each axle spring gear 14 comprises: an upper component configured to contact with the truck frame; a lower component placed on the axle box body; and an elastic body which connects the upper component with the lower component and has an elastic function acting in a vertical direction. The upper component, the elastic body, and the lower component are integrally molded by cutting work.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a shaft box support device that elastically supports a wheel box that includes a wheel and an axle so that the wheel shaft can roll, and more particularly to a shaft spring device that constitutes the shaft box support device.

  The railcar bogie includes a bogie frame including side beams spaced along the rail direction and a cross beam provided along the sleeper direction and connecting a central beam in the longitudinal direction of the side beam, and both ends of the axle and the axle. A wheel shaft comprising two wheels provided in the section, a shaft box body that holds the wheel shaft in a rollable manner and a bearing, and a rail car axle box support device (hereinafter referred to as a shaft box) that elastically supports the shaft box body. It is composed of a support device).

  The axle box support device is an apparatus that elastically connects (supports) the axle box body that holds the wheel shaft so as to be able to roll so as to follow the irregularity of the track. Conventionally, the axle box support device includes an elastic body and a spring cap that is provided at an upper end portion of the elastic body (a shaft spring formed of a coil spring or the like) and that is in contact with both longitudinal end portions of the side beams of the carriage frame. Was composed. The axle box support device is softly supported in the vertical direction of the axle box body to allow a large displacement, and is rigidly supported in the front / rear and left / right directions of the axle box body to allow a small displacement.

  Patent Document 1 discloses a configuration in which a horizontal spring constant of a shaft spring device constituting a shaft box support device can be arbitrarily set at low cost. In this shaft spring device, an intermediate rigid cylinder and an elastic layer are used as an axial center between a main shaft and an outer cylinder (part corresponding to a spring cap) having the same or substantially the same axis center, and these are concentric. Alternatively, it is configured by interposing elastic portions formed by alternately laminating in the inner and outer diameter directions in a substantially concentric state.

JP 2011-163560 A

  The shaft spring device disclosed in Patent Document 1 can elastically support the shaft box body in the vertical direction and the horizontal direction with respect to the carriage frame without requiring a mold for newly manufacturing rubber parts. . Furthermore, in the horizontal direction, a small spring constant and a large spring constant can be realized regardless of the front-rear direction or the left-right direction. There is a merit that it can realize the final movement that works well.

  However, between the main shaft (upper shaft spring seat) that contacts the axle box, the outer cylinder or rod-shaped portion (lower shaft spring seat) that contacts the carriage frame, and the main shaft and the outer cylinder or rod-shaped portion. There is a problem to be solved in that it is necessary to provide a rubber laminate to be arranged, the number of parts is large, and the number of assembling steps when assembling these parts is reduced. The objective of this invention is providing the trolley | bogie for rail vehicles provided with the axle box support apparatus which can reduce a number of parts and an assembly man-hour.

In order to solve the above-described problems, the present invention provides a bogie frame, a wheel shaft including a wheel and an axle,
A railcar bogie comprising a shaft box that holds the wheel shaft so that it can roll, and a shaft spring device that connects the bogie frame and the shaft box body, the shaft spring device being in contact with the bogie frame. The upper part, the elastic body, and the lower part are composed of a part, a lower part placed on the axle box, and an elastic body that connects the upper part and the lower part and has an elastic function in the vertical direction. Are integrally formed by machining.

  ADVANTAGE OF THE INVENTION According to this invention, the bogie for rail vehicles provided with the axle box support apparatus which can reduce a number of parts and an assembly man-hour can be provided.

FIG. 1 is a front view (partial cross-sectional view) of a railway vehicle bogie having an axial beam type axle box support device. FIG. 2 is a vertical sectional view of the shaft spring device provided in the shaft box support device shown in FIG. 1. FIG. 3 is a front view (partial cross-sectional view) of a railcar bogie having a wing-type axle box support device. FIG. 4 is a vertical sectional view of a shaft spring device provided in the wing-type shaft box support device.

  FIG. 1 is a front view (partially sectional view) of a railcar bogie having a shaft beam type axle box support device. The railcar bogie is composed of a pair of side beams 12 spaced apart in the rail direction, and horizontal beams (not shown) that connect the center portions of the side beams in the rail direction and are arranged along the sleeper direction. A wheel frame 3 composed of a wheel and an axle, and a shaft beam type shaft box support device 5 including a shaft box body 11 that holds the wheel shaft 3 in a rollable manner.

  The shaft beam type shaft box support device 5 includes a shaft beam 10 having one end portion elastically connected to the lower portion of the side beam 12 and extending in the horizontal direction, and a shaft box body provided at the other end portion of the shaft beam 10. 11 and an axial spring device 14 that is provided between the upper portion of the axle box 11 and both ends of the side beam 11 and that mainly allows vertical displacement.

  Both ends of the side beam 12 in the rail direction are provided with spring cap portions 13 provided with holes in the vertical direction, and the upper end portions of the shaft spring device 14 are fitted and positioned in the holes of the spring cap portions 13. Is done. A damper 9 is provided at the other end of the shaft box body 11 of the shaft beam type shaft box support device 5 to absorb vertical vibrations of the shaft beam type shaft box support device 5.

  FIG. 2 is a vertical sectional view of the shaft spring device provided in the shaft box support device shown in FIG. 1. The shaft spring device 14 has a cylindrical shape with a vertical axis, and is provided on a cylindrical convex portion inserted into the spring cap portion 13 and at a lower end of the convex portion, and abuts against a lower surface of the spring cap portion 13. An upper portion 14a having a flange, an elastic portion 14c obtained by processing a spiral opening groove in a cylinder to obtain an elastic function, and a lower portion having a cylindrical curved seating surface that is in contact with the upper portion of the axle box body 11 and protrudes upward 14b.

  The entire shaft spring device 14 extending from the upper portion 14a to the elastic portion 14c and the lower portion 14b is integrally formed by cutting, and the shaft around the range from the upper portion 14a to the elastic portion 14c is hollow. A screw hole 80 for fixing the upper portion 14 a of the shaft spring device 14 to the spring cap portion 13 of the side beam 12 is provided in the flange that contacts the spring cap portion 13 of the upper portion 14 a. A cylindrical screw seat 82 protruding upward from the central portion of the lower portion 14 b is integrally formed, and a screw groove 84 is machined on the inner surface of the cylindrical screw seat 82.

  A height adjusting spacer may be inserted between the lower surface of the lower portion 14b of the shaft spring device 14 and the upper surface of the shaft box 11 so that the left and right wheels 3 of the wheel shaft bear the weight of the vehicle substantially evenly. . In order to facilitate this height adjustment work, the bolt 16 that engages with the screw seat 82 of the lower part 14b is opened to the upper part 14a so that the elastic part 14c of the shaft spring device 14 can be held in the compressed state in the vertical direction. The function as an elastic body of the shaft spring device 14 can be suppressed by inserting from the portion.

  Conventionally, a shaft spring device that is composed of three parts, that is, a shaft spring seat upper part, a shaft spring (coil spring, etc.) and a shaft spring seat lower part, is integrated into a single part by the above-described structure. 14 can be replaced. For this reason, the man-hour for manufacturing the bogie for rail vehicles, and the maintenance man-hour at the time of bearing replacement | exchange can be reduced.

  Furthermore, in the contact portion between the upper end portion of the shaft spring and the shaft spring seat upper portion, and the contact portion between the lower end portion of the shaft spring and the shaft spring seat lower portion, the terminal portion of the coil spring is the upper portion of the shaft spring seat and the shaft spring. In some cases, the seat lower part locally abuts, and the abutting part locally wears out. Since the shaft spring device 14 having the above configuration is an integrally molded product by cutting, it is applied to the shaft spring or the shaft spring seat, which is generated when the contact surface of the shaft spring seat mounting surface is not uniformly contacted like the coil spring. The effect of the highly accurate spring function can be obtained.

  Conventionally, the lower surface of the lower part of the shaft spring device that constitutes the shaft spring device and is disposed below the shaft spring has been formed horizontally. On the other hand, the upper surface of the shaft box body has a built-in bearing that holds the end of the cylindrical axle so that it can roll. Needed connecting parts to do. The shaft spring device 14 according to the present invention does not require a connecting component by forming the shape of the lower surface of the lower portion 14b into a convex cylindrical shape. For this reason, it is possible to reduce the manufacturing cost associated with the reduction in the number of parts and to promote weight reduction by omitting the connection parts.

  FIG. 3 is a front view (partial cross-sectional view) of a railcar bogie having a wing-type axle box support device, and FIG. 4 is a vertical sectional view of an axial spring device provided in the wing-type axle box support device. is there.

  The wing-type axle box support device 6 is an axle box support device provided with an axle spring device 24 at the front and rear of the axle box body 22 in the rail direction, and is a component corresponding to the axle beam 10 constituting the axle beam type axle box support device 5. Not equipped. The shape and function of the shaft spring device 24 provided in the wing type shaft box support device 6 are basically the same as those of the shaft spring device 14 provided in the shaft beam type shaft box support device 5.

  The wing-type shaft box body 22 includes a shaft box body that holds a shaft box with a built-in bearing and extends from the shaft box in the rail direction, and a pair of shaft springs that are mounted on the upper surface of the extension portion 22a. The device 24 is configured. The upper part 24a of the shaft spring device 24 is brought into contact with the lower surface of the side beam 12 forming the carriage frame to support the load of the carriage. Therefore, as shown in FIG. 4, the lower surface of the lower portion 24b of the shaft spring device 24 provided in the wing-type shaft box support device 6 is formed substantially horizontally.

  Since the shaft spring device 24 provided in the wing-type shaft box support device 6 is integrally formed by cutting similarly to the shaft spring device 14, manufacturing and maintenance man-hours associated with the reduction in the number of parts can be reduced. Furthermore, the bias of the shaft spring load that occurs when the contact surface of the shaft spring seat mounting surface, which is observed when the coil spring is selected as the shaft spring, does not come into contact with the entire circumference is eliminated, and a highly accurate spring function is obtained. Can do.

DESCRIPTION OF SYMBOLS 3 ... Wheel 5 ... Axle beam type axle box support device 9 ... Damper 10 ... Axle beam 11, 22 ... Axle box body 12 ... Side beam (cart frame)
13 ... Spring cap parts 14, 24 ... Axial spring device 14a, 24a ... Upper part (Axial spring device)
14b, 24b ... Lower part (shaft spring device) 14c, 24c ... Elastic part 15, 16 ... Bolt 22a ... Extension part 80 ... Screw hole 82 ... Screw seat 84 ... Screw part

Claims (3)

Bogie frame,
An axle consisting of a wheel and an axle,
A shaft box that holds the wheel shaft in a rollable manner;
An axial spring device connecting the bogie frame and the axle box body;
In a railway vehicle carriage comprising:
The shaft spring device is
An upper part that contacts the bogie frame;
A lower part placed on the axle box,
An elastic body that connects the upper part and the lower part and has an elastic function in the vertical direction;
Consists of
A carriage for a railway vehicle, wherein the upper part, the elastic body, and the lower part are integrally formed. In the railcar bogie described in claim 1,
The shaft spring device is incorporated in the shaft beam type shaft box support device,
A bogie for a railway vehicle, wherein the lower surface of the lower part is formed as an upwardly convex arcuate surface. In the railcar bogie described in claim 1,
The axle box body has an extending portion extending along the rail direction before and after the axle box body,
The axle spring device is incorporated in a wing-type axle box support device provided in a pair between the extending portion and the carriage frame.

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