FR2691220A1 - Fixture to permit changing of packing of bearing without interrupting its operation - includes body in which are mounted two fittings forming primary and secondary bearings between them - Google Patents

Abstract

The unit is made up of a body of a bearing (1) in which are mounted two packings (22) and (11) that form between them the primary bearing and the secondary bearing. The main bearing is made in a way that it is able to be dismantled without interrupting the functional articulation. When it is dismounted the loads that it normally takes are automatically taken by the secondary bearing. A system of jacks (10) are provided to assist in the removal and refitting the intermediary piece (14) which supports the packing of the primary bearing. Use/Advantage - For the refitting of a packing to a trunnion bearing of large mechanical assemblies where the operation can be carried out without interrupting its function.

Description

 The present invention relates to a device for allowing the change of the lining of a bearing without interrupting its operation.

 Traditionally, during the replacement of the lining of a bearing, the journal no longer rests on any lining, which no longer allows it to pivot while supporting the loads which are intended for it (lining is understood to be any part such as a friction ring, bearing or any other known element, which can replace it).

 The device according to the invention overcomes this drawback. It indeed has, according to a first characteristic, a bearing body in which two linings, one main, the other secondary, are mounted on the same axis forming what will be called a main bearing and a secondary bearing. the lining of the main bearing may be mounted inside an intermediate piece which, according to its particular embodiment, will generally be of conical external shape so that it will suffice during disassembly, for a slight axial displacement of this part so that the loads supported by the main bearing are automatically transferred to the secondary bearing. Also, during reassembly, the conical outer shape of this piece will allow a progressive and automatic recentering of the tourbillon.

According to particular embodiments:
An axial stop, of the appropriate type, and capable of supporting the axial thrust of the pin, may be interposed between the face forming the end of the pin and an opposite bearing face. This stop, or the element which will support it, may be adjustable so as to precisely adjust its axial position.

 This articulation will generally be opposed to a second articulation of the same kind and symmetrical, which will cause the axial thrusts of the assembly to be supported, according to their direction of thrust, by one or the other of the axial stops contained in each of the opposite bearings.

 The linings of the main bearing, of the secondary bearing as well as of the axial stop may be made up, one and the other, of one or more elements of the kind: simple friction ring or with ball joint, bearing with or without internal cage and exterior, or any other known element which can replace it.

 The secondary bearing will generally be smaller than the main bearing, its purpose being to temporarily replace the main bearing.

 The radial operating clearance, between the lining of the secondary bearing and the bearing on which it is articulated will generally be greater than the clearance between the lining of the main bearing and its own bearing.

 The bearing body as well as the intermediate piece may be equipped with anchoring points allowing the fixing of jacks or any other system, helping to assemble and disassemble these elements.

 The intermediate piece can be fixed to the bearing body by screws. The penetration of the intermediate piece into the bearing body, as well as the adjustment of the axial stop, can be adjusted with shims.

 According to a first variant, the trunnion can be mounted inside a sleeve, which will have a cylindrical end which, coming out of its housing, will constitute the bearing on which the lining of the secondary bearing can be articulated. In this case, the end of the sleeve with the secondary lining hinged on it will form the secondary bearing.

 According to a second variant, the cylindrical part on which the lining of the secondary bearing can be articulated, will be constituted by a cylindrical part forming a body with the part which inserts the pin. In this case, too, the cylindrical part with the lining of the secondary bearing hinged on it, will form the secondary bearing.

 These two variants, described above, are intended to be able to disassemble the pin at the same time as changing the lining of the main bearing; the pin no longer constituting, in this case, the element on which the secondary bearing will temporarily articulate.

The trunnion and, according to a variant, the sheath that can receive it, can be maintained in their respective housings by all kinds of appropriate fastening elements;
Alternatively, the constituent parts of the joint and particularly the bearing surfaces of the seals and seals, may be covered with a filler metal which will resist corrosion, will improve the hardness and the friction qualities of these say litters.

The accompanying drawings illustrate the invention:
Figure 1 shows in section, the device according to the invention;
Figure 2 shows in section the device when the main bearing is being dismantled;
Figure 3 shows in section a variant showing the secondary bearing hinged on the end of a sleeve.

 Figure 4 shows in section, a variant showing the secondary bearing articulated on a part replacing the role played by the external part of the sleeve.

 With reference to these drawings, the device comprises a bearing (1) having, at one of its ends and concentric with its axis, a housing (2) of conical shape, opening towards the outside on a face (3) perpendicular to the axis.

This face (3) can be pierced with a series of threaded holes (4). The other end of the bearing comprises a housing (5), concentric with the axis, opening at the other end of the bearing, on a face (6) perpendicular to the axis. A housing (7) can be executed in the bearing in order to receive a seal (8). The outer part of the bearing may have on its periphery anchoring ears (9) allowing the fixing of jacks (10) which will be temporarily mounted. The bearing (I) will generally be constructed of steel.

 Inside the housing (5) will be mounted a bearing lining (11) which may, depending on the version, consist of a single cylindrical piece, one end of which will fit into the housing, and the other end, which will have a larger diameter, will form a collar which will rest on the face (6) of the bearing and which will have its other parallel face, spaced from the bearing face (12) by a clearance. According to another version, the lining bearing (11) may be formed of two separate parts, one consisting of a ring which will be fully fitted into its housing (5), the other consisting of a washer mounted around the pin and interposed with a clearance between the faces (6) and (12). According to the two versions described above, this lining (11) (composed of one or two elements) will be constructed of materials offering good friction qualities and resistance to corrosion.

 According to a third version not shown, the bearing lining (11) may be made up of known rolling elements of the bushing or needle or roller bearing type. In this case, a sealing device must be provided between the faces (6) and (12) and around the said lining.

 The intermediate piece (14) which mounts in the housing (2) will have at one of its ends, an outer part of conical shape corresponding to the housing (2). Its other end may consist of a cylindrical part, of a larger diameter, forming a collar in which will be drilled holes (15) which will receive screws (16) which will be screwed into the threaded holes (4). The collar, designated above, will be defined by its faces (17) and (18) perpendicular to its axis.

 Thickness shims (35) making it possible to adjust the penetration of the intermediate piece (14) in its housing (2), may be interposed between the faces (17) and (3) of said pieces.

 The interior of the part (14) will have a housing (19) concentric with its conical outer part, opening at one end and may end at the other end with a shoulder (20). The other end of the part (14) may be provided with a housing (24) concentric with its axis, and opening onto the face (18). Anchoring ears (21) may be located on the periphery of the part (I4), they will allow the fixing of the jacks (10) which by their other end may already be fixed to the anchoring points (9).

 In the housing (19) of the intermediate piece (14) will be mounted a bearing lining (22) (23). This packing may, depending on the version, be made either in one piece, or, as shown, of several elements forming a ball joint. This lining may, according to another version not shown, consist of a rolling element of known type. This gasket can be kept in place in its housing (19) by a fixing element which can be, for example, as illustrated, a washer (25) fixed by screws (26) and which will maintain an axial pressure on the gasket (or its external part (23).

 In the housing (24) of the intermediate piece (14), can be mounted a stop support (27), which can be constituted by a cylindrical part which will be fitted in the housing (24), The other end being constituted by a collar with a larger outside diameter. Between said flange and the face (18) of the part (14) may be inserted shims of thickness (28) which will allow to adjust the axial position of the support (27). The support (27) and the shims (28) can be maintained by screws (29).

 An axial stop (30) (31) can be fixed in the axis of this support (27), it can be composed, depending on the variants, of a single friction piece, or of several elements, as illustrated. It may also consist of known rolling elements. According to its version, this stop can be held in place, on its support (27), by fixing elements such as screws (32).

 The pin (33) may constitute the scope of the main bearing as well as of the secondary bearing as illustrated by Figures 1 and 2. It may, according to a variant constitute only the scope of the main bearing; the secondary bearing resting either on the end of a sleeve (37) or on a cylindrical part (38) of the hub, as illustrated by FIGS. 3 and 4

Claims (9)

 1) Device for allowing the change of the lining of a bearing, without interrupting its operation, characterized in that it comprises a bearing body (1) inside which two independent seals (22) and ( 11) forming what will be called a main bearing and a secondary bearing.  2) Device according to claim 1 characterized in that the secondary bearing will be able to temporarily support the loads normally applied to the main bearing.  3) Device according to claims 1 or 2 or characterized in that the intermediate piece (14) has a conical outer shape so that when disassembled, a small axial movement is sufficient for the loads initially supported by the main bearing to be transferred on the secondary bearing, as illustrated in Figure 2.  4) Device according to any one of the above claims characterized in that during the mountain of the intermediate part (14) which contains the lining of the main bearing, the conical shape of said part will cause its axial movement to center progressively and automatically the journal.  5) Device according to any one of the above claims characterized in that a stop (30) can be placed at the end of the pin (33) and in its axis, supporting the axial thrusts applied to the joint.  6) Device according to any one of claims 1 to 4, characterized in that the intermediate part (14) and the bearing body (1) may have anchor points (21) and (9) which will allow the fixing cylinders (10) for axially displacing said intermediate piece in order to take it out of its housing (2) and to put it there again.  7) Device according to any one of the above claims characterized in that adjustment shims (35) interposed between the face (3) of the bearing body (1) and the face (17) of the intermediate piece (14 ) may allow the penetration of said intermediate piece to be adjusted in the bearing body.  8) Device according to any one of the above claims characterized in that adjustment shims (28) interposed between the face (18) of the part (14) and the face (36) of the part (27) may allow to adjust the axial clearance of the stop (30).  9) Device according to any one of the above claims characterized in that the lining of the secondary bearing, according to a variant, may be articulated on a part formed either by the end of a sheath (35) or else on a cylindrical part (36) formed in the hub (34). This variant allows the secondary bearing to be able to articulate while the pin is disassembled, as illustrated in FIGS. 3 and 4.