Joints and connections – Interfitted members – Lugged member – rotary engagement
Reexamination Certificate
2000-10-05
2001-11-27
Browne, Lynne H. (Department: 3629)
Joints and connections
Interfitted members
Lugged member, rotary engagement
C285S376000
Reexamination Certificate
active
06322284
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns an arrangement for the fixing, to a body structure element of a motor vehicle, of a hydraulic control cylinder.
2. Description of the Related Art
The invention concerns more precisely an arrangement for the fixing, to a body structure element of a motor vehicle, of a hydraulic control cylinder with a tubular axial shape overall, notably for controlling a clutch or brakes on the vehicle, of the type in which the control cylinder is movable between a position of mounting in the body structure element of the vehicle, and a position of locking with respect to the body structure element of the vehicle in which it is immobilised with respect to the body structure element of the vehicle by immobilisation means, of the type in which means of immobilising it with respect to translation along the axis of the cylinder include, from front to rear, an abutment surface which extends transversely from a main body of the cylinder, axial elastic means, a wall fixed to the body structure element which has in it an orifice, and at least one bracket, which extends transversely from the main body, which, on mounting, passes through a complementary cutout extending radially from the orifice, the bracket allowing the translational immobilisation of the body with respect to the vehicle body when a rotation of the body about its axis brings it from its mounting position to its locking position and effects the gripping of the wall between the abutment surface, the elastic means and the bracket.
Many examples of arrangements for fixing a hydraulic control cylinder with a tubular axial shape overall to a body structure element of a motor vehicle are known.
First of all conventional arrangements are known, in which the control cylinder is fixed directly to a bulkhead on the vehicle, for example by studs, screws or nuts.
The arrangements of this type have the advantage of using control cylinders which are simple in shape, and therefore inexpensive to produce by casting.
However, these mountings are constraining, the mounting of a control cylinder of the abovementioned type requiring good coaxiality of the anchoring points on the control cylinder and the holes in the bulkhead.
To resolve this drawback, mountings of the type previously described have been conceived, often referred to as “bayonet” mountings, which allow a rapid mounting or demounting of the control cylinder in the body structure element in the vehicle, notably the vehicle bulkhead.
The document GB-B-2.163.475 describes an arrangement of this type in which the control cylinder has three brackets which simultaneously effect the translational immobilisation and the rotational immobilisation of the control cylinder.
To this end, the control cylinder has a U-shaped elastic pin which is slipped radially onto two parallel countersinks on the cylinder body, which is in abutment on a front face of the support and in abutment on a rear face of a radial collar on the body of the control cylinder. The control cylinder also has three brackets uniformly distributed angularly, whose front faces have teeth which are intended to cooperate with notches on a rear face of the support, when the elastic pin axially acts on the body of the control cylinder.
This arrangement has the drawback of requiring a suitable angular positioning of the teeth on the cylinder opposite the notches in the support, which makes mounting tricky.
In addition, the particular shape of the brackets requires a mould with a particularly complex shape and an expensive casting process, the surface state of the teeth being necessary to a good positioning of the control cylinder with respect to the vehicle bulkhead.
SUMMARY OF THE INVENTION
To remedy this drawback, the invention proposes a control cylinder arrangement in which the means of translational immobilisation and the means of rotational immobilisation are independent of each other.
To this end, the invention proposes an arrangement of the type described previously, characterised in that means of rotationally immobilising the body with respect to the wall include a dish, which is fixed with respect to rotation to the body, which is interposed between the axial elastic means and the wall, and which has at least one stud which extends axially through the orifice in the wall in order to come into abutment against the wall when the body is brought in rotation from its mounting position to its locking position, and include at least one tooth, fixed with respect to rotation to the body, which extends axially at the edge of the body in order to bite into the wall when the body is brought in rotation from its mounting position to its locking position, and to immobilise the body in the locking position.
According to other characteristics of the invention:
the body has at its periphery at least one bracket, which is associated with a complementary cutout in the orifice, the dish has a cylindrical shape overall, and has a rear transverse wall, which has a circular orifice and a cutout, identical to that in the body, to enable it to be mounted on the body,
the dish has a rectilinear ridge arranged tangentially to the edge of its circular orifice, and which is intended to cooperate with a complementary flat, arranged on the periphery of the body, to fix the dish to the body with respect to rotation,
the stud is arranged on a rear face of the rear transverse wall of the dish, at the edge of a substantially radial ridge on the cutout,
the dish is produced by moulding from a plastics material,
the dish is produced by pressing from a metal sheet,
the stud is formed by an axial fold in the sheet metal of the dish and is oriented towards the rear,
the tooth extends from a front face of the bracket on the body,
the tooth is carried by the rear face of the rear transverse wall of the dish,
the tooth is formed by an axial fold in the metal sheet of the dish, which is arranged at the edge of the cutout, and which is oriented towards the rear,
the abutment surface of the body forms part of a radial annular collar,
the elastic means include an elastic washer which bears on a rear face of the collar and on a front internal face of the dish,
the dish is able to slide on the body between two extreme positions, a first front position in which the front internal face of the dish is acted on by the elastic washer, and a second rear abutment position in which a radial protrusion, carried by an internal wall of the dish, extends in the direction of the axis of the cylinder in order to immobilise the dish nesting on the collar,
the wall is carried by a support which is arranged opposite an opening formed in the body structure element, and has two lugs with holes at their ends, which enable the support to be mounted on the body structure element by screwing,
the body has at its periphery at least two brackets of different shapes, uniformly distributed, which are associated with at least two complementary cutouts in the orifice, to allow angular location of the body when it is inserted in the orifice,
the rectilinear ridge connects together two consecutive cutouts in their area of junction with the orifice.
REFERENCES:
patent: 815627 (1906-03-01), Oldham
patent: 1507230 (1924-09-01), Claflin
patent: 2155640 (1939-04-01), Bruce
patent: 2638258 (1953-05-01), Churchill
patent: 3232644 (1966-02-01), Pfeifer et al.
patent: 3427552 (1969-02-01), Sauer et al.
patent: 4893426 (1990-01-01), Bixler
patent: 6058804 (2000-05-01), Chang
patent: 17691 (1906-01-01), None
patent: 2163475 (1988-05-01), None
Bonardo Sandro
Rey Frederic
Villata Gino
Bochna David E.
Browne Lynne H.
Liniak Berenato Longacre & White
Valeo
LandOfFree
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