GB2134469A

GB2134469A - Mounting bogie axleboxes

Info

Publication number: GB2134469A
Application number: GB08332220A
Authority: GB
Inventors: Gerd Potel; Theodor Hammen
Original assignee: MAN Maschinenfabrik Augsburg Nuernberg AG
Current assignee: MAN AG
Priority date: 1982-12-02
Filing date: 1983-12-02
Publication date: 1984-08-15
Also published as: GB8332220D0; ZA838940B; FR2537075A1; GB2134469B; ES275899U; BR8306754A; DE3244545A1; ES275899Y

Abstract

A longitudinally-extending leaf- spring link (1) is connected at one end to a bogie side sill and at its other end to an axlebox housing (2) by means of a pin (3). The pin (3) is supported via a rubber sleeve in an eye of the link (1). In order to reduce wear the rubber sleeve is bonded to the pin (3) to prevent rotation and is also bonded to a bush press fitted in the eye. Each end of the pin (3) is provided with flats non-rotatably engaging a corresponding recess (9) in the housing (2) and has a bore (7c) receiving a screw (5a) securing the pin to the housing. <IMAGE>

Description

SPECIFICATION A bogie frame having an axlebox guiding system This invention relates to a bogie having an axlebox guiding system in which an axlebox housing is connected by means of links positioned horizontally in a fore-and-aft direction to a bogie side sill.

It is known to connect an axlebox housing to a bogie frame by means of leaf-spring links attached to a side still of the bogie frame by means of a serrated joint, whereas the axlebox housing is connected to the link by means of a hinge joint. In order to prevent wear, the hinge joint is provided with a rubber element which is directly bonded to a bush a press-fit in an eye of the link. On its inner side, the rubber element is provided with a bonded metal bush which projects somewhat beyond the rubber element at both ends, the metal bush accommodating a cylindrical pin which, at its both ends, extends through holes of a bracket, this bracket providing the connection to the axlebox housing.

In order to prevent the metal bush from turning on the pin, the latter is formed with a collar at one end, which, in the installed position, contacts one end face of the metal bush. The other end of the pin is formed with a thread onto which a nut is screwed which is pressed via an intermediate element onto the other end face of the metal bush, so that friction prevents turning of the pin and metal bush. It has been found in practice, however, that friction is insufficient in the long run and that, as a result of primary spring deflection, relative rotation takes place between the pin and metal bush, and this causes wear and fretting corrosion.

An object of this invention is to provide a bogie frame having an axlebox guiding system in which relative rotation between the pin and link is avoided and, at the same time, the physical design is simplified.

The invention provides a bogie frame having an axlebox guiding system comprising a link extending in the direction of travel of the bogie and being attached at one end to a side sill of the bogie and at the other end via an eye to a support member of an axlebox housing by means of a pin, wherein the pin projects through a resilient sleeve and is nonrotationally bonded thereto, the resilient sleeve being bonded to the inside of a bush press-fitted in the eye at the said other end of the link, the pin having shaped ends engaging correspondingly-shaped portions of the support member so as to prevent rotation of the pin, fastening means passing through bores at the ends of the pin and engaging aligned bores in the shaped portions of the support member for fastening the pin thereto.

Due to the direct bonding of the rubber element to the pin, relative rotation of the two parts is positively prevented and, consequently, freedom from wear is achieved. Fretting corrosion is also inherently prevented.

Embodiments of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a partial section taken along the line I-I of Fig. 3, Figure 2 is an enlarged elevation of a pin with flats and a hole for the fastening screw of the embodiment of Fig. 1, Figure 3 is an elevation of an axlebox housing with a leaf-spring link fitted to the bracket and a primary spring arranged over the centre of the bearing, and Figure 4 is an elevation of an axlebox housing with a leaf-spring link fitted to the bracket and one of two existing primary springs shown.

In Fig. 1, a leaf-spring link 1 is attached to an axlebox housing 2 by means of a pin 3, which projects through an eye 4 of the leafspring link 1. The ends of the pin 3 are attached by means of screws 5a and Sb to a bracket 6, which has a U-shaped end to accommodate the eye 4 of the link. The bracket 6 forms an integral casting together with the axlebox housing 2.

In addition to the force-locking connection by the screws 5a, 5b, the pin 3 is connected in a form-locking manner to the side arms 6a, 6b of the bracket 6. To this end, the ends of the pin 3 are provided with flats 7a, 7b, which register in the side arms 6a and 6b respectively (Fig. 2). In the sectioned part of Fig. 1, a rubber element 8 can be seen which is directly bonded onto the pin 3, whereas the connection of the rubber element 8 to the eye of the link 4 is in a conventional manner by means of a bush 4a, which is a press-fit in the eye to prevent rotation, whereby sliding movements between the rubber element 8 and the pin 3, and hence resulting wear, are obviated.

In Fig. 2, the pin 3 is shown in an end elevation. The pin 3 is provided at its both ends with flats 7a, 7b and, moreover, it is also penetrated at its ends by the holes 7c.

Fig. 3 shows the pin 3 in the installed position. The pin 3 is placed in a recess 9 in the side arm 6b, which provides a formlocking joint and, consequently, a fixed connection to the axlebox housing 2. In addition, the screw 5a is inserted in a blind hole 10 in the side arm 6a to provide a force-locking connection, the screw 5a projecting through a hole 7c in the pin 3.

Compared with constructions in which the leaf-spring link 1 is secured by means of pins that penetrate the side arms 6a, 6b through holes, the construction according to the invention offers the advantage that the rubber element can be directly bonded to the pin 3 to prevent rotation relative to the latter, whereby freedom from wear can be warranted over an extended period of time.

Fig. 3 shows a typical embodiment where the leaf-spring link is secured to an axlebox housing 2 having a primary spring arranged over the axle centre. While the primary spring itself has been omitted in the drawing, part of the spring seat 11 which, as the bracket 6, is integrally cast with the axlebox housing 2 can be seen.

An embodiment in which the leaf-spring link 1 is secured to the axlebox housing 2 where two primary springs are provided is shown in Fig. 4. In this case, the bracket 6 required for securing the spring leaf link 1 and the spring seat 11 are formed as an integral member. The attachment of the spring leaf link 1 via the eye 4 and the pin 3 formed with flats 7a, 7b is the same as that described with reference to Figs. 1 to 3.

Claims

1. A bogie frame having an axlebox guiding system comprising a link extending in the direction of travel of the bogie and being attached at one end to a side sill of the bogie and at the other end via an eye to a support member of an axlebox housing by means of a pin, wherein the pin projects through a resilient sleeve and is non-rotationally bonded thereto, the resilient sleeve being bonded to the inside of a bush press-fitted in the eye at the said other end of the link, the pin having shaped ends engaging correspondinglyshaped portions of the support member so as to prevent rotation of the pin, fastening means passing through bores at the ends of the pin and engaging aligned bores in the shaped portions of the support member for fastening the pin thereto.

2. A bogie frame as claimed in claim 1, wherein the shaped-ends of the pin are provided with flats.

3. A bogie frame as claimed in claim 1 or 2, wherein the fastening means comprises threaded bolts in threaded engagements with blind bores in the shaped portions of the support member.

4. A bogie frame as claimed in any one of claims 1 to 3, wherein the support member is shaped as a bracket cast integrally with the axlebox housing.

5. A bogie frame having an axlebox guiding system substantially as herein described with reference to the accompanying drawing.

6. A rail vehicle having a bogie frame as claimed in any one of the preceding claims.