SIDE BEARING

Abstract

A side bearing for freight bogies of railway transport comprising a base, a plate, a cap, and a resilient element. The base has an annular protruding element, a centering protruding element, and two lateral protruding elements. The lateral protruding elements have J-shaped recesses. The plate has an annular protruding element with lugs, and an aperture for receiving the cap. The cap has an annular protruding element and a centering protruding element. A central opening is provided in the body of the resilient element for positioning on the protruding elements of the base and cap. The annular protruding element of the plate is telescopically mounted inside the annular protruding element of the base, and the cap is mounted inside the aperture of the plate. The lugs of the annular protruding element snap into the J-shaped recesses of the lateral protruding elements.

Claims

1. A side bearing comprising: a base having an annular protrusion, a centering protrusion and two lateral protruding parts; a plate arranged above the base and having an annular protrusion, the plate being telescopically connected to the annular protrusion of the base and having a hole in an upper part of the plate, the hole being made with a gap from an inner surface of the annular protrusion of the plate; a cover having a cylindrical or conical shape, the cover having a flat upper surface to interact with a car body, an annular protrusion in a lower part and a centering protrusion on a flat lower surface, the cover being arranged inside the plate with the annular protrusion such that an inner lower horizontal surface of the plate is in contact with the upper surface of the annular radial protrusion of the cover; an elastically deformable elastomeric element arranged in a cavity formed by the base with the annular protrusion, the plate with the annular protrusion and the cover in their working assembly, and provided with a central through hole provided along a direction of its compression; wherein the centering protrusion of the base and the centering protrusion of the plate are arranged in the central through hole of the elastically deformable elastomeric element; each lateral protruding part of the annular protrusion of the base is provided with one J-shaped recess including a vertical through recess, a horizontal sectoral recess and a vertical constraining recess, the vertical through recess having two vertical constraining surfaces, the vertical constraining recess having a stop surface in the upper part and two vertical constraining surfaces; the plate is provided on the outer surface of the annular protrusion in the lower part and has two guiding protrusions, each of which is provided with two vertical constraining surfaces and a stop surface in the upper part, the stop surface of each of the guiding protrusions on the annular protrusion of the plate interacting with the stop surface of the corresponding vertical constraining recess in the annular protrusion of the base; there is a technological gap between the vertical constraining surfaces of each of the guiding protrusions on the annular protrusion of the plate and the vertical constraining surfaces of the corresponding vertical constraining recess in the annular protrusion of the base; when the side bearing is in a complete closure state, an extreme upper point of the guiding protrusion on the annular protrusion of the plate is arranged above an extreme upper point of the horizontal sectoral recess, thereby eliminating the possibility of rotating the plate relative to the base and preventing the side bearing from being spontaneously disassembled.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The invention is illustrated in the drawings, in which:

[0011] FIG. 1 shows a side bearing;

[0012] FIG. 2 shows a section taken along line A-A in FIG. 1;

[0013] FIG. 3 shows a section taken along line B-B in FIG. 1;

[0014] FIG. 4 shows a section taken along line C-C in FIG. 1;

[0015] FIG. 5 shows a sectional view of a housing of the side bearing;

[0016] FIG. 6 shows the housing of the side bearing;

[0017] FIG. 7 shows a plate of the side bearing.

DETAILED DESCRIPTION OF THE INVENTION

[0018] A side bearing comprises a base 1, a plate 2, a cover 3, an elastically deformable elastomeric element 4, and an axis 5.

[0019] The base 1 is provided with an annular protrusion 6, an upper surface 7 on the upper part of the annular protrusion 6, a centering protrusion 8, and two lateral protruding parts 9. Each lateral protruding part 9 is provided with one J-shaped recess 10 including a vertical through recess 11, horizontal sectoral recess 12 and one vertical constraining recess 13. The vertical through recess has two vertical constraining surfaces 14. The vertical constraining recess has a stop surface 15 in its upper part and two vertical constraining surfaces 16.

[0020] The plate 2 has a cylindrical or conical shape and is provided with an annular protrusion 17 in its lower part, a lower surface 18 and a hole 19 in its upper part. The hole 19 is made with a gap from an inner surface 20 of the annular protrusion 17 of the plate, so that an inner lower horizontal surface 21 is formed between the inner surface 20 of the annular protrusion 17 and the hole 19. The plate 2 is provided on the outer surface 22 of the annular protrusion 17 in the lower part, with at least two guiding protrusions 23 each provided with two vertical constraining surfaces 24 and a stop surface 25 in the upper part of the guiding protrusion 23. Moreover, the plate 2 has a flat upper surface 26 configured to interact with a car body.

[0021] The cover 3 is provided with an upper horizontal surface 27, a lower horizontal surface 28, a centering protrusion 29 arranged on the axis 6 and formed on the lower horizontal surface 28, an annular radial protrusion 30, an inner cylindrical surface 31, an outer cylindrical surface 32 on the annular radial protrusion 30, and an upper stop surface 33 on the annular radial protrusion 30.

[0022] The elastically deformable elastomeric element 4 is preferably provided with a central through hole 34 on the axis 6 along the direction of its compression, so that the centering protrusion 8 of the base 1 and the centering protrusion 18 of the plate 2 are arranged inside the central hole 34. The elastically deformable elastomeric element 4 is further provided with an upper surface 35 and a lower surface 36 and is arranged in a cavity formed by the base 1 with the annular protrusion 6, the plate 2 with the annular protrusion 17 and the lower horizontal surface 28 of the cover 3 in their working assembly.

[0023] The stop surface 25 of each guiding protrusion 23 on the annular protrusion 17 of the plate 2 interacts with the stop surface 15 of the corresponding vertical constraining recess 13 in the lateral protruding portion 9 of the annular protrusion 6 of the base 1. There is a technological gap between the vertical constraining surfaces 24 of each guiding protrusion 23 on the annular protrusion 17 of the plate 2 and the vertical constraining surfaces 16 of the corresponding vertical constraining recess 13 in the lateral protruding portion 9 of the annular protrusion 6 of the base 1. When the side bearing is in a complete closure state, an extreme upper point 37 of the guiding protrusion 23 on the annular protrusion 17 of the plate 2 is arranged above an extreme upper point 38 of the horizontal sectoral recess 12, thereby avoiding the possibility of rotating the plate 2 relative to the base 1 and spontaneously disassembling the side bearing.

[0024] In a preferred embodiment, the annular protrusion 17 of the plate 2 is arranged inside the annular protrusion 6 of the base 1.

[0025] In a preferred embodiment, the cover 3 is arranged inside the plate 2 with the annular protrusion 17 so that the lower horizontal surface 21 of the plate 2 is in contact with the upper stop surface 33 of the annular radial protrusion 30 of the cover 3. There is a technological gap between the outer cylindrical surface 32 of the annular radial protrusion 30 of the cover 3 and the annular protrusion 17 of the plate 2. There is a technological gap between the inner cylindrical surface 31 of the cover 3 and the hole 19 of the plate 2, the gap substantially providing the rotation of the cover 3 relative to the plate 2, thereby resulting in more uniform wear of the upper horizontal surface 27 of the cover 3 that is in contact with the car body and, consequently, increasing the lifespan of the side bearing.

INDUSTRIAL APPLICABILITY

[0026] The sequence of assembling the side bearing is as follows.

[0027] The elastically deformable elastomeric element 4 is installed in the cavity formed by the base 1 and the annular protrusion 6. Then, the cover 3 is installed, whereafter the plate 2 is installed such that the annular protrusion 17 of the plate 2 is arranged inside the annular protrusion 6 of the base 1. The cover 3 is arranged inside the plate 2 with the annular protrusion 17 such that the lower horizontal surface 21 of the plate 2 is in contact with the upper stop surface 33 of the annular radial protrusion 30 of the cover 3. The technological gap is provided between the outer cylindrical surface 32 of the annular radial protrusion 30 of the cover 3 and the annular protrusion 17 of the plate 2. Being provided between the inner cylindrical surface 31 of the cover 3 and the hole 19 of the plate 2, the technological gap substantially provides the rotation of the cover 3 relative to the plate 2. Further, the elastically deformable elastomeric element 4 is pressed by applying an external load via the plate 2 and the cover 3 onto the heat insulator 5 such that the guiding protrusions 23 move inside the vertical constraining recess of the “T”-shaped recess 10 to the position at which the extreme upper point 37 of the guiding protrusion 23 on the annular protrusion 17 of the plate 2 is arranged below the extreme upper point 38 of the horizontal sectoral recess 12. The flat upper surface 26 of the plate 2 and the upper horizontal surface 27 of cover 3 are arranged below the upper surface 7 of the annular protrusion 6 of the base 1. Next, the plate 2 with the annular protrusion 17 is rotated around the axis 5 relative to the base 1 with the annular protrusion 6 to the position where the guiding protrusions 23 on the annular protrusion 17 of the plate 2 are inside the vertical constraining recesses 15. After that, the external load is removed from the cover 3 and plate 2. The plate 2, the cover 3, and the elastically deformable elastomeric element 4 move to the extreme working position, while the stop surface 25 of each guiding protrusion 23 on the annular protrusion 17 of the plate 2 interacts with the stop surface 15 of the corresponding vertical constraining recess 13 in the lateral protruding part 9 of the annular protrusion 6 of the base 1. The technological gap is provided between the vertical constraining surfaces 24 of each guiding protrusion 23 on the annular protrusion 17 of the plate 2 and the vertical constraining surfaces 16 of the corresponding vertical constraining recess 13 in the lateral protruding portion 9 of the annular protrusion 6 of the base 1.

[0028] The side bearing operates as follows.

[0029] When a dynamic load is applied to the cover 3, the force is transmitted to the elastically deformable elastomeric element 4, which is installed in the cavity without the possibility of axial displacement and has contact with the cover 3 and the base 1. The annular protrusion 17 of the plate 2 moves along the axis 6 due to the fact that the guiding protrusions 23 move inside the vertical constraining recess 13, the J-shaped recess 10 such that the extreme upper point 37 of the guiding protrusion 23 on the annular protrusion 17 of the plate 2 is arranged, during the operation of the side bearing, above the upper extreme point 38 of the horizontal sectoral recess 12 of the lateral protruding part 9 of the annular protrusion 6 of the base 1. The technological gap is provided between the vertical constraining surfaces 24 of each guiding protrusion 23 on the annular protrusion 17 of the plate 2 and the vertical constraining surfaces 16 of the corresponding vertical constraining recess 13 in the lateral protruding part 9 of the annular protrusion 6 of the base 1. The elastically deformable elastomeric element 4 is centered on the axis by arranging the centering protrusion 29 of the cover 3 and the centering protrusion 8 of the base 1 in the central through hole 34 of the elastically deformable elastomeric element 4. In this case, the cover 3 is arranged inside the plate 2 with the annular protrusion 17 such that the lower horizontal surface 21 of the plate 2 is in contact with the upper stop surface 33 of the annular radial protrusion 30 of the cover 3. The technological gap is provided between the outer cylindrical surface 32 and the annular protrusion 17 of the plate 2. Being provided between the inner cylindrical surface 31 of the cover 3 and the hole 19 of the plate 2, the technological gap substantially provides the rotation of the cover 3 relative to the plate 2, thereby resulting in more uniform wear of the upper horizontal surface 27 of the cover 3.