FR2517018A3 - Casing for right angle drive gear - has two identical pressure cast halves with housings for shaft bearings - Google Patents

Abstract

The gear case is pressure cast from a light alloy in two identical halves (1a,b). The finish achieved in the casting process is such that no further machining of the castings is necessary. Each half casing incorporates half housings (5) for the shaft bearings. The half-casings also incorporate half housings (7) for the right angle shaft. Two half holes (12), threaded, for the screwed plug (13), are also included as are the holes (9,11) for the clamping bolts and bushes (3) for the mounting bolts.

Description

 The present invention relates to a corner gear housing.

 It is known that casings, or booters, intended for gears, in particular angle gears, generally comprise a body and its cover, which are both cast from materials of the cast iron type. Such a casing also defines support seats for drive shafts, these seats being arranged to receive bearings.

 The formation of these bearing seats requires a machining operation, after the casting operation, this machining obviously increasing the cost of the final product.

In addition, difficulties are frequently encountered when assembling conventional gear housings.
The invention aims to remedy the drawbacks encountered in the prior art by providing, in particular, a corner gear housing which can be more conveniently manufactured and assembled.

 The invention also aims to provide a corner gear housing which is of a simple design, a flexible application, while being functional and of a relatively low cost price.

 These objects are achieved according to the invention, using a corner gear housing, characterized in that it comprises two corresponding half-shells having a conf: substantially parallelepipedic configuration, each half-shell defining , on two opposite sides, a pair of semi-circular bearings or bearings and, on a side orthogonal to said opposite sides, a half of a sleeve, said semi-circular bearings and said sleeve forming a seat arranged to receive bearings for the shafts transmitting the angle gear, and further defining, in its corner areas, through housings extending orthogonally to the base of the half-shell and serving to receive threaded fixing members.

 Other advantages and characteristics of the invention will be highlighted, in the following description, given by way of nonlimiting example, with reference to the single appended drawing which is a perspective view of the housing conforming to the ion. vention.

 Referring to the single figure, it can be seen that the angle gear housing shown essentially comprises two half-shells 1a, 1b which are identical and preferably formed from a light alloy cast under pressure. The half-shells la, lb have a substantially parallelepipedal configuration comprising rounded outer corners.

 In the corner areas of each half-shell, and orthogonally to its base 2, are formed respective tubular parts 3 which define housings used to receive threaded members intended to mount the gear housing on a machine.

 On the two opposite ribs of a half-shell, two bearing surfaces or semi-circular supports 4 are formed which project slightly outwards. The semi-circular bearings 4 constitute seat halves for bearings of an associated drive shaft. On the inner surfaces of the sleeve halves 6 are formed annular shoulders 5 for said bearings.

 On a side located between those which are provided with the bearings or supports 4, there is provided a half-sleeve 6, which serves to form a seat for the bearings of another shaft of the angle transmission mechanism. In addition, are formed on the inner surface of the half-sleeve 6, annular recesses 7 intended to receive said bearings.

 On the side of the semi-circular bearings 4 and of each sleeve half 6, respective pairs of bosses 8 are formed through which holes 9 are formed, the axes of which are orthogonal to the base 2 of a half-shell. The bosses 8 start from the surface plane corresponding to the half-shells, extending over a distance substantially equal to half of a tubular part 3; the bosses 8 have rounded external contours up to a cylindrical part coaxial with the holes 9.

 Near the end of the half-sleeve 6, two extensions 10 are provided which start from the corresponding surface of the half-shell, in the same way as the bosses 8.

The extensions 10 include through holes 11.

 The holes 9 and 11 constitute housings for threaded members intended to assemble the two half-shells la, lb with each other.

 On the edge of the wall which is directed towards the sleeve 6, there is provided, in a central position, a semicircular threaded recess 12 which constitutes half of a housing intended to receive a nozzle 13 screwed in position. An annular seal 15 is arranged so as to establish a seal around said end piece 13.

 Pairs of ribs 15, 16, having the shape of a triangular gusset, are also provided respectively longitudinally with respect to the semi-circular bearings 4 and to the sleeve 6.

 As shown in the description given above, the angle gear housing according to the invention is obtained by assembling two identical parts. The semi-circular bearings 4 and the sleeve half 6 actually form tubular seats for the bearings of the transmission shafts. It should be noted, in particular, that these seats are produced in a pre-defined condition already during the casting of the half-shells, so that they require no further machining.

 It should be noted that the two half-shells die-cast 1a, 1b have been designed so that, during deburring and sandblasting carried out after the die-casting operation, no further treatment or machining on machine tools is necessary for their use. It should be noted that, in addition to the characteristics and profiles defined above, all the walls of the housing have a substantially constant thickness and the ribs already described 15 and 16 are provided so as to minimize the deformations which would normally occur otherwise during the casting process.

 The arrangement of the assembly bolts which are engaged in the holes 9, 11 and the profile of the casing, which is sectioned in a separation plane so as to form two half-shells, also make it possible to remarkably remove the deformations , unavoidable during die casting, when the two half-shells are assembled with each other, because the flat contact surfaces are tightly applied without play on their contact edges.

 Also, it should be noted that the casing is extremely simple to assemble in a short time since it suffices to fix together the two half-shells la, lb by means of the threaded fixing members provided, after the components have been put in place. of the angle gear inside the housing.

 In putting the invention into practice, it is possible to choose at will the materials, the shapes and the dimensions according to the envisaged application. In addition, all the details of the invention may be replaced by other technically equivalent ones.

Claims (4)

 1. Angle gear housing, characterized in that it comprises two corresponding half-shells (la, lb) having a substantially parallelepiped configuration, each half-shell defining, on two opposite sides, a pair of bearings or supports ( 4) semi-circular and, on a side orthogonal to said opposite sides, one half of a sleeve (6), said semi-circular bearings (4) and said sleeve (6) forming a seat arranged to receive bearings from the shafts of transmission, and further defining, in its corner areas, through housings (9, 11) extending orthogonally relative to the base of said half-shell (la, lb) and serving to receive threaded fixing members.  2. Housing according to claim 1, characterized in that said through housings (9, 11) serving to receive threaded fixing members comprise drilled bosses (8) which are formed in pairs on the sides of said semi-circular bearings ( 4) and said sleeve half (6) and which extend from the flat application surface of said half-shells (la, lb).  3. Housing according to claim 1, characterized in that it comprises in the corner areas of each half-shell (la, lb) tubular parts (3) whose axes are orthogonal to the base (2) of a half -shell (la, lb), and holes for receiving threaded members for fixing the casing to a machine.  4. Housing according to claim 1, characterized in that, on one side of the half-shell (la, lb) which is directed towards said sleeve half (6), there is provided in the edge area of that -ci, a semicircular threaded recess (12) constituting one half of a housing in which a threaded end piece (13) is screwed.