Showing papers by "Saab Automobile AB published in 1991"

High-strength, thin-walled single piece catheters

Abstract: An integral, single-piece, high-strength, thin-walled, inflatable catheter is disclosed. The catheter has one end partially or entirely closed, and is at least uniaxially oriented along its entire length. The method and apparatus for making the catheter is also disclosed. The catheters of this invention have a calculated radial tensile strength of about 10,000 psi or greater at every point along the catheter.

Dilatation balloon fabricated from low molecular weight polymers

Abstract: A low molecular weight, flexible, biaxially oriented, dilatation catheter balloon comprising oriented polyethylene terephthalate, and having a calculated radial tensile strength of greater than about 25,000 psi.

Operation of servo devices for driving a motor vehicle - control, arrangement and method

Abstract: A steering wheel (11) is fitted with a control (13) which, when operated in mutually independent control directions (41-45), controls the acceleration and deceleration of the vehicle, as well as upward and downward gear changing, and activates one of a number of cruise control functions. The control (13) may preferably be mounted immediately adjacent to the steering wheel rim (15) on the upper side of a wheel spoke (12), so that it may readily be operated by the driver's thumb without the necessity of releasing the grip on the wheel. Thus, the control incorporates all of the most essential driving control functions. The control according to the present invention encourages the driver to select, at an early stage, those accelerator and gear-change parameters which are most advantageous to economic driving or are most suited to the prevailing traffic conditions, the control actions required involving a minimum of manual movements. The present invention also relates to an arrangement and a method of controlling servo devices for the driving of a motor vehicle, utilizing the control (13) mounted on the steering wheel.

Suspension system with improved resonance damping and a method for regulating the suspension system

Abstract: A suspension system for motor vehicles is disposed between body (1) and wheel (2) and is provided with a damper (4) with integrated resonance dampers (40, 48) for improved insulation of transmission of road unevenness to the body. The resonance damper is formed in that the casing (40) of the damper (4) forms a moving mass m 40 between the body (1) and the wheel (2), the casing being connected to the wheel via a spring (48) harmonized with the mass m 40 . The pistons (41, 42) of the damper are connected via piston rods (43, 44, respectively) to the body (1) and the wheel (2), respectively. By a fixed adaptively regulated flow between the chambers (5--7) formed in the damper (4) in response to parameters dependent upon the oscillation cycle, there will be obtained improved insulation primarily in those resonance ranges which are typical for suspension systems for motor vehicles,

Quiet check valve for pulsating flow.

Abstract: A check valve (4) with spherical, spring-loaded valve head (25) is used for pulsating flows, especially in a fuel injection system for Otto engines. As a result of low flow resistance, such check valves have had a tendency to cause noise when the valve head (25) strikes down against the valve seat (11) during pulsating of the flow caused by selective opening of the fuel injection nozzles. The valve head (25) is designed with a flange (7) downstream of the valve seat (11), and this flange (7) interacts with a narrow boring (13) during the first part of the opening stroke. Consequently, a secondary throttling (12) is formed, in addition to the primary throttling between the valve head (25) and the valve seat (11), which contributes to the valve head being forced away at a distance from the valve seat. During the movement of the valve head towards the seat, the flange first comes down into the boring (13), as a result of which the continued movement of the valve head towards the seat is damped by the volume of fluid which lies between flange (7) and seat (11), as a result of which noise is prevented from occurring.

Combustion engine with variable compression ratio

Abstract: An internal combustion engine (10) is designed with a cylinder section (11) which is pivoted on a crankcase section (13) to provide different compression ratios. The crankcase section (13) is provided with raised lateral walls (21, 22, 24, 25) with upper surfaces (82-85), which lie in the same plane and thereby allow simple assembly of a seal (34) between the cylinder section (11) and crankcase section (13). The lateral walls (21, 22, 24, 25) also enable auxiliary devices for the engine to be easily secured without having to allow for the mobility of the cylinder section (11) relative to the crankcase section (13).

Front part for motor vehicle.

Abstract: Avant-corps pour vehicule automobile, constitue de deux longerons lateraux (7), de deux longerons centraux (9) et d'un faux-châssis (3). Forehearth for a motor vehicle, comprising two lateral longitudinal members (7) of two central longitudinal members (9) and a subframe (3). Ledit avant-corps comprend egalement deux montants (11, 13) reliant les longerons lateraux (7) aux longerons centraux (9) ainsi que les longerons centraux (9) a des longerons qui font partie du faux-châssis (3). Said forehearth also comprises two uprights (11, 13) connecting the side bars (7) to the central longitudinal members (9) and the central frame plates (9) of the side members which form part of the subframe (3). Cette configuration permet a l'avant-corps d'avoir une division des forces dans trois sens par l'intermediaire des montants (11, 13). This configuration allows the front building to have a division of power in three senses through the uprights (11, 13). On peut ainsi obtenir une tres bonne stabilite et une tres bonne absorption d'energie lors des collisions. One can achieve a very good stability and excellent energy absorption during collisions.

A distributor device for a ventilation system in a vehicle

Abstract: L'invention se rapporte a systeme de ventilation (1) pour vehicules equipes d'un distributeur (4) servant a distribuer l'air de ventilation vers differentes buses de ventilation (5-10) situees dans l'habitacle du vehicule. The invention relates to the ventilation system (1) for vehicles with a distributor (4) for distributing ventilation air to different ventilation nozzles (5-10) located in the vehicle cabin. Le distributeur (4) comporte un ventilateur cylindrique (12) tourillonne rotatif dans un logement (11) et presentant une surface de boitier (36) et des parois terminales (37) dans lesquelles sont menagees des ouvertures (13a, 13b, 14) qui cooperent avec des conduits de sortie (25-30), lesquels sont disposes dans la surface circonferentielle et les parois du logement. The distributor (4) comprises a cylindrical fan (12) rotatably journalled in a housing (11) and having a housing surface (36) and end walls (37) in which are formed openings (13a, 13b, 14) cooperate with outlet conduits (25-30) which are arranged in the circumferential surface and the housing walls. Ainsi, la rotation du ventilateur permet de reguler le flux d'air vers les differents conduits de sortie. Thus, rotation of the fan is used to regulate the air flow to the various outlet ducts. Des lors que le logement et le ventilateur comportent chacun au moins une ouverture qui s'etend a la fois sur la paroi terminale et la surface circonferentielle, un conduit de sortie peut etre realise avec une faible etendue dans le sens de la circonference, permettant ainsi des chutes de pression extremement basses, de sorte qu'il est possible de prevoir une pluralite de configurations de conduits de sortie dans un seul distributeur compact. Since the housing and the fan each have at least one opening which extends to both the end wall and the circumferential surface, an outlet duct may be formed with a small size in the circumferential direction, thus allowing extremely low pressure drops, so it is possible to provide a plurality of outlet ducts configurations in one compact machine.

Push-on gripper plate for use with rock bolts

Abstract: A push-on gripper plate for use in securement of a mesh screening means on the protruding, threaded, end portion of a rock bolt inserted into a rock face is disclosed. The gripper plate has a generally planar base portion adapted to overlie the mesh screening means and a central opening in the base portion having two or more leg portions positioned on the perimeter of the opening and inclined upwardly, inwardly toward the center of said opening above the plane of the base portion. A plurality of tab portions are positioned on the perimeter of said opening in alternating arrangement with said leg portions, the tab portions being inclined upwardly, inwardly toward the center of the central opening above the plane defined by the base portion.

Gearbox for motor vehicle

Abstract: Une boite de vitesses mecanique, a vitesses etagees, comprend une pluralite de paires de pignons (25-34) qui cooperent et sont disposees sur un arbre d'entree (19) et un arbre de sortie (22) et un premier arbre lateral (24). A mechanical gearbox, to stepped speeds, includes a plurality of gear pairs (25-34) which cooperate and are arranged on an input shaft (19) and an output shaft (22) and a first lateral shaft ( 24). Les paires de pignons peuvent etre engrenees selectivement afin de donner differents rapports de vitesse. The pairs of gears can be meshed selectively to provide different gear ratios. En outre, la boite de vitesses comprend un pignon (39) dispose sur un deuxieme arbre lateral (40), qui est utilise a la fois pour creer une marche arriere et pour transmettre une force d'entrainement au premier arbre lateral (24). In addition, the gearbox comprises a gear (39) disposed on a second side shaft (40), which is used both to create a back and to transmit a driving force to the first side shaft (24). La boite de vitesses peut ainsi etre concue avec un faible encombrement axial, meme lorsque la boite comporte de nombreuses vitesses etagees. The gearbox can be designed with a low axial space, even when the box has many storied speeds.

Internal combustion engine with variable compression, provided with reinforcements of the crankcase section

Abstract: An internal combustion engine with variable compression which includes a cylinder receiving section which is tiltably mounted to a crankcase section (4) of the engine, and a crankshaft (12) which is mounted in the crankcase section via crankshaft bearings (90) arranged in the lower region of the crankcase section (4). The crankshaft bearings incorporate bearing caps (102) which constitute continuous stiffening transverse connecting elements between the lower later parts (103,106) of the crankcase section. These transversely connecting bearing caps rest at their outer ends (108, 110) against internal surface areas in the lower lateral parts (104, 106) of the crankcase section on both sides of the engine. The bearing caps (12) are secured in the crankcase section (40) not only by means of vertical crankshaft bearing screws (112, 114) but also by means of screwed joints (166, 118, 120) which connect the lower lateral parts to the outer ends (108, 110) of the bearing caps.

Device for winding and unwinding a wire.

Abstract: A device for winding and unwinding a wire, such as a relatively thin electric cable is described. It comprises a winding element (1) suitably in the form of a drum and a wire guidance means (4) which is rotatable relative to the winding element (1) and axially movable in relation to same. The device is characterized particularly in that the circumference of the winding element (1), speed of rotation and axial speed are so adjusted mutually and to the diameter of the wire that the wire on winding is wound up on the winding element (1) by means of the wire guidance means (4), rotation by rotation repetitively, from the surface of the winding element (1) up to a maximum radial extension.

Fuel system for an internal combustion engine

Abstract: In a fuel system for an internal combustion engine (2), a fuel pump (3) is placed in a fuel chamber (6) in a fuel tank (5). Fuel is transferred from the fuel tank (5) to the fuel chamber (6) by means of an ejector (9) which is driven by a fuel flow in a return line (8) which is connected to a forward line (4) from the fuel pump (3) and via which return line fuel can return to the fuel chamber without passing the engine.

A microprocessor with Ada real time support

Abstract: BACKGROUND. Efficient use of Ada in real time applications has been hindered by a number of factors, some inherent in the language itself, others caused by deficiencies in compiler implementations. Often the recourse of programmers and system implementers has been to use a subset of Ada, in particular excluding the tasking constructs of the language, replacing those with a non-Ada real time executive.

Transient radiation response of VLSI circuits: shadowing effects and pulse widths dependence in laser measurements

Abstract: Transient radiation responses on VLSI-circuits of various complexities were studied for different pulse widths using both laser and accelerator sources. The shadowing effects of the incident laser light due to the metallization were also investigated. The results were in good agreement with the results from the accelerator measurements. The transmission studies show that the metal cover at the most sensitive latch-up areas on the circuits compared to the reference circuit IDT 6116 follows the VdG/laser ratio latch-up threshold values well. The large divergence (>or=20%) from 1.0 for some circuits' VdG/laser-ratio indicates, however, that the use of only one calibration circuit for radiation assessment with a laser is unsatisfactory. The big difference in metal cover and complexity between circuits requires the use of a reference circuit with similar metal coverage as the circuit under test. >

Belt transmission in an internal combustion engine for accessory device driving.

Abstract: La presente invention consiste a monter dans un moteur a combustion interne une transmission par courroie (23) pour l'entrainement d'un dispositif accessoire (26). The present invention consists in mounting in an internal combustion engine by a transmission belt (23) for driving an accessory device (26). Dans ce montage, des elements deflecteurs (27, 28) sont disposes de sorte que la courroie d'entrainement (24) servant a entrainer le montage vienne appuyer par exemple contre la roue libre (16) du moteur. In this arrangement, the deflector elements (27, 28) are arranged so that the drive belt (24) for driving the support assembly comes for example against the free wheel (16) of the engine. Les elements deflecteurs (27, 28) sont disposes de sorte que la zone (32) delimitee par la courroie d'entrainement (24) se situe a l'exterieur de la zone qui renferme l'axe de rotation (31) de la roue libre (16). The deflector elements (27, 28) are arranged so that the area (32) delimited by the drive belt (24) lies outside the area which includes the axis of rotation (31) of the wheel free (16). Etant donne que, de ce fait, la courroie d'entrainement (24) peut etre montee sans croiser obligatoirement l'axe de rotation (31), une telle transmission par courroie (23) peut simplement etre installee a l'arriere du moteur, ce qui permet de reduire l'etendue axiale du moteur. Since, therefore, the drive belt (24) can be mounted without necessarily cross the axis of rotation (31), such a transmission belt (23) may simply be installed in the rear of the engine, which reduces the motor axial extent.

Optimum choice of anamorphic ratio and boost filter parameters for a SPRITE-based infrared sensor

Abstract: The ringing in the impulse response for a SPRITE based thermal imager is analyzed. The optimum choice of anamorphic ratio and boost filter parameters is derived under a constraint for maximum ringing in the impulse response. It appears that the optimum value for the anamorphic ratio is about 1.4 and that it is optimal to have a boost that gives the maximally allowed percentage of ringing.

Internal combustion engine with variable compression, provided with reinforcements of the crankcase section in the region of the main bearings.

Abstract: In-line engine with variable compression, comprising a cylinder receiving section which is tiltably mounted in the crankcase section (4) of the engine, in which the crankshaft is mounted by means of crankshaft bearings (90) arranged in the lower region of the crankcase section (4). The crankshaft bearings incorporate bearing caps (102) which constitute continuous stiffening transverse connecting elements between the lower lateral parts (104, 106) of the crankcase section. These transversely connecting bearing caps rest at their outer ends (108, 110) against internal surface areas in the lower lateral parts (104, 106) of the crankcase section on both sides of the engine. The bearing caps are secured in the crankcase section (4) not only by means of vertical crankshaft bearing screws (112, 114) but also by means of screwed joints (166, 118, 120) which connect the lower lateral parts to the outer ends (108, 110) of the bearing caps.

Hypersonic Leeside Delta-Wing-Flow Computations Using Centered Schemes

Abstract: In recent years research investigations have enhanced considerably our knowledge about the flow over the leeside of a delta wing in low and transonic speeds. But we still know relatively little about the corresponding flow in hypersonic speed. The flow here is very near to vacuum, and the extent of vortical flow structures, if any, is not generally known. The purpose of this work is to study the leeside flow over a thick blunt- edged delta wing of 70° sweep at M ∞ = 7.15 and α = 30° by means of numerical simulations using the Euler and Navier- Stokes equations.

Hinge,in particular for a vehicle door

Abstract: A hinge (4) for a vehicle door (1) has two hinge halves (5, 6) which are pivotably connected, where the hinge half (6) intended for fixed assembly to the vehicle is separable and has a pin part (8) intended for a hinge pin (7) and a post part (9) intended for a door post (2) The hinge pin (7) has a downwardly directed free end (11) which can be axially introduced into an attachment (12) on the post part (9) The pin part (8) and post part (9) can be joined to or released from each other while the hinge pin (11) is situated in the attachment (12) and holds the vehicle door hung