Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1987-02-05
1989-02-07
Braun, Leslie A.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
74 8915, 74425, 248429, F16H 116, B60N 102, B60N 108
Patent
active
048023744
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device controlling the displacement of an element in relation to a base, a device of the kind comprising a motor having a shaft provided at one end with a worm, or an equivalent part, capable of driving a nut-wheel whose axis is orthogonal to the direction of the shaft of the motor, the worm and nut-wheel unit forming part of a reduction gear whilst a screw of similar, cooperates with the nut of the nut-wheel, provision being moreover made for displacement guidance means between the base and the element.
The invention concerns more particularly, because it is in this case that its application seems to have the greatest advantage, but not exclusively so, a device for controlling the displacements of the elements of a motor vehicle, in particular, of a seat of this vehicle.
Many solutions have hitherto been proposed for such a control. However, the transmission of the rotational motion between the shaft of the motor and the nut-wheel poses problems. It is in particular desirable that the reduction gear comprising the worm and the nut-wheel should be of small size and simple and fast to assemble. It is, moreover, desired, to compensate for the deviations inherent in all manufacture of the relative geometrical positions of the components of the device.
In the text below, the term nut-wheel, or quite simply, wheel will be used interchangeably (for the purpose of simplification) to designate the same element.
The devices of the kind defined above have the advantage of immobility of the worm in rotation around its axis in relation to the element to be displaced, which simplifies the mounting of the worm. Moreover, the transmission of the forces between the nut-wheel and the screw engaged in the nut is effected under favourable conditions over the whole periphery of the screw.
The purpose of the invention is above all to make the devices of the kind defined above in such a way that they should meet the various practical requirements better than heretofore and in particular, that the reduction gear should be of small size and easy and fast to assemble. Preferably the invention aims to absorb the deviations related to the manufacturing tolerances, in the relative geometrical positions of the various components of the device, in relation to the element, in particular between the element and the motor during the displacement of the said element.
In accordance with the invention, a device for controlling the displacement of an element in relation to a base, of the kind defined above, is characterized in that the reduction gear comprises a stirrup comprising two orthogonal intersecting cylindrical sleeves, the internal space of these sleeves communicating via an opening corresponding to the intersection, one of these sleeves being capable of accommodating the nut wheel, whilst the worm is accommodated in a tube connected to the motor casing which comprises a window corresponding to the intersection of the sleeves on its cylindrical wall at one end intended to be engaged in the second sleeve of the stirrup, so that, for the assembly of the reduction gear, the above mentioned end of the tube is fitted in the said second sleeve of the stirrup for the above mentioned window to come to be opposite the above mentioned opening and for the threads of the worm projecting through the said window to be able to mesh with the nut-wheel which is fitted in the first sleeve mounted between two sides comprising holes for the passing of the screw.
In the case of an element guided by two substantially parallel slides, transversely interspaced from each other, the motor is disposed between these two slides and comprises two shaft outputs orientated substantially orthogonally to the slides, the motor being situated nearer one of the slides than the other and the tube, of shorter length, situated between the motor and the nearer slide, is integral with the motor casing.
The two sides which the stirrup sleeve is mounted which is intended to accommodate the nut-wheel, are preferably the two sides of a forked end fixe
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Hamelin Rene-Louis
Wattier Maurice F.
Anchell Scott
Braun Leslie A.
Equipments Automobiles Marchal
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