RU2223189C2 - Car bogie side frame axle box cover plate - Google Patents

Abstract

FIELD: railway transport. SUBSTANCE: invention relates to methods of making and restoration of load-bearing parts of freight cars with support surfaces operating under sliding friction conditions at high contact stresses. Proposed axle box cover plate is made of metal with wear resistance properties to shape of side frame support surface over axle box. Cover plate is trapezoidal, being made solid or provided with hole in middle part. Laps adjoin beveled sides of cover plate for bending behind contour of over axle box surface. Length of lap is not less than thickness of horizontal over axle box wall of part. Laps are made either solid or provided with recesses. Trapezoidal tabs adjoin the laps for bending onto rear side of side frame. EFFECT: improved serviceability of side frames and their repairability in zones of support surfaces of axle box apertures. 2 ex, 6 dwg

Description

 The invention relates to railway rolling stock, in particular to the manufacture and restoration of load-bearing parts of freight cars with supporting surfaces operating under sliding friction at high contact stresses.

 Known is the sliding support of the friction vibration damper of a freight car truck according to the patent of the Russian Federation 2069630 (Bulletin 33, 1996 [1], in which an intermediate gasket is made between two mutually moving elements to one of them, made in the form of a rubbing surface of an aluminum alloy with a wear-resistant coating.

 The disadvantage of this technical solution is the high cost of manufacturing and labor when installing gaskets on the supporting surfaces of the bearing parts.

 Known wear-resistant strip, made in the form of naduksovy bearing surface of the side frame and reinforced by welding along the contour of this surface ("Heavy Engineering" 10, 2000, p.32) [2].

 The disadvantage of this technical solution is the need to weld the lining to the supporting surface of the side frame with long welds near areas experiencing high cyclic and shock loads, stresses from which often coincide in sign with thermal stresses from welding and, when combined with them, reduce the operational reliability of the part . Welding also reduces the maintainability of the part upon receipt of repair.

 The aim of the invention is to improve the health of the side frames and their maintainability in the areas of the supporting surfaces of the axle box openings.

 The essence of the invention lies in the fact that for a lining made of sheet metal with wear-resistant properties in the form of a supporting surface of the axle box opening of the side frame and fixed to the side walls of the latter, the working plane is a trapezoidal solid plate or with a hole in the middle part that does not interact with contact the axlebox surfaces, with overlaps on both chamfered sides, designed to be bent beyond the contour of the part above the box, with a length of at least 0.5 of the lining length and width less than the thickness of the horizontal oversized wall of the part, made in the longitudinal direction solid or with recesses adjacent to the petals of a trapezoidal shape, designed to grasp the horizontal oversized wall when the petals are bent behind its back and abut against beveled faces belonging to different petals and located on one side overlays for at least one of the vertical stiffeners on the I-section of the end part of the part, and beveled edges belonging to different petals and located on the other side of the lining, into the vertical walls of the part at the transition from the I-section to the box section, while the minimum thickness of the lining is determined taking into account the stiffness required in the process of fixing the lining and maintaining the shape of the latter during operation, but not less than the standard wear of the supporting surface at which the part is subject to repair.

 The significance of the distinguishing features is confirmed by the following.

 1) The length of the inlets for bending beyond the contour of the supporting surface should be at least 0.5 of the length of the lining, and the width should be at least the thickness of the horizontal over-slide wall of the part in order to provide the necessary rigidity when fixing the lining and maintaining the shape during operation, which is confirmed by strength tests.

 2) The presence of trapezoidal petals adjacent to the lining inlets is necessary to prevent displacement during operation of the part relative to the supporting surface of the part due to their bending beyond the rear side of the horizontal over-axle wall and abutment by beveled edges to at least one of the stiffeners on the I-section of the end parts and into vertical walls at the transition section of the latter to the box section.

 3) The minimum thickness of the lining, determined by the amount of regulatory wear, is necessary, in addition to ensuring rigidity, also to maintain the lining's performance between the planned receipts for repairs.

 Examples of specific performance overlays.

 Example 1

 Figure 1 shows an embodiment of the over-slip lining of the side frame of the carriage model 18-100, and figure 2 shows the side frame with the lining mounted. Figure 3 shows the same in section along aa in figure 2; in FIG. 4 is the same, in section along BB in FIG. 2, and in FIG. 5 is the same, in section along BB in FIG. 2.

 The overlay 1 is made of sheet metal with increased wear-resistant properties compared to the metal of the side frame, including made of metal with a wear-resistant coating. It has a working surface bounded by dashed lines I (Fig. 1) and flaps 2 in the longitudinal direction on both sides (behind dashed lines I), designed to bend them beyond the contour of the supporting surface, to one edge of which are adjacent the dashed lines II trapezoidal shape 5, which serve to grasp the horizontal over-box wall for its rear side on the I-beam section of the end part of the part.

 When placing the lining on the naduksovoy surface of the side frame (figure 2) the boundaries of the working surface of the lining must coincide with the contour naduksovoy surface of the part, and the petals 5 after bending abut at least one face in the vertical stiffening ribs 6 on the I-section of its upper belt ( figure 5). The fixing of the lining and fixing the position in the horizontal and vertical planes during operation are ensured by pressing the lugs 2 against the side walls of the part 3 (Fig. 3) and bending the petals 5 over the over-box wall 4 (Fig. 4) at the transition section of the box section of the end part of the part to the I-beam section between the stiffeners 6 and the oval wall 7 (figure 5). The lining thickness is 6 mm.

 Example 2

 Figure 6 shows another embodiment of the lining with a central hole on a portion of its plane that does not interact with the contact surfaces of the axle box and recesses in the middle part of the inlets, which is advisable from the point of view of reducing the metal consumption of the lining and access to control the over-slip wall of the part upon receipt of repair . According to the results of strength tests, it was found that the length of the inlets in the presence of recesses should be not less than half the length of the lining, and the thickness necessary to maintain its shape under working loads, not less than the normative wear of the overbox bearing surface of the side frame when the part is received for repair.

Sources of information
1. Slide bearing friction damper. RF patent 2069630 (Bulletin 33, 1996).

 2. Pranov A.A., Shenaurin A.A. Complex modernization of a biaxial model 18-100 trolley // Heavy engineering. 10, 2000, p. 32.

Claims (1)

The over-slip pad of the side frame of the wagon carriage made of sheet metal with wear-resistant properties in the form of the supporting surface of the axle box opening of the part and fixed to the side walls of the latter, characterized in that the working plane of the pad is a trapezoidal solid plate or with a hole in the middle part that does not interact with contact surfaces of the axlebox, with flaps on both chamfered sides, designed to be bent beyond the contour of the superbook surface of the side frame, at least 0.5 the length of the lining and a width of at least the thickness of the horizontal over-box wall of the part, made in the longitudinal direction solid or with recesses adjacent to the petals of a trapezoidal shape, intended to grasp the horizontal over-box wall when bending the petals by its back side and abut against beveled edges belonging to different petals and located on one side of the lining, at least in one of the vertical stiffeners on the I-section of the end part of the part, and beveled faces, belonging heaping different petals and located on the other side of the lining, into the vertical walls of the part at the transition from the I-beam to the box section, while the minimum thickness of the lining is determined taking into account the stiffness required in the process of fixing the lining and maintaining the shape of the latter during operation, but not less than the standard wear of the supporting surface at which the part is subject to repair.

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