News Column

Researchers Submit Patent Application, "Setting Device, Particularly a Motor Vehicle Parking Brake", for Approval

September 10, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Deutloff, Norbert (Thungersheim, DE); Kraft, Ekkehard (Retzstadt, DE); Roos, Stephan (Wertheim, DE); Sauer, Armin (Arnstein, DE), filed on February 13, 2014, was made available online on August 28, 2014.

No assignee for this patent application has been made.

News editors obtained the following quote from the background information supplied by the inventors: "An actuation mechanism for a brake with a brake cable which can be operated by an actuator via a spindle shaft and with a force sensor for determining the mechanical loading of the brake cable on application of the brake is known from DE 101 02 685 A1, in which the mechanical load on the brake cable via the actuator, decoupled from the brake cable, can be determined. The force sensor contains a spring screw arranged axially between the brake side end of the spindle shaft and a housing accommodating the actuation mechanism, of which the change in length on actuation of the spindle shaft to apply the brake is measured by a Hall chip within the spring screw and serves as a measure for the force exerted on the brake cable when the brake is applied."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "According to the object of the present invention, using a mechanism of the type described above as its starting point, a setting device is to be created which stands out by virtue of its compact design and makes it possible in a simple manner also to measure the brake cable force when the brake is released, especially if blocking occurs.

"The aforementioned object can be achieved by a setting device comprising a setting unit featuring a remotely-operated drive, a telescopic device movable axially in a housing or similar in a longitudinal axis of the setting unit, containing a hollow shaft and a spindle shaft connected to it in a manner that enables it to rotate and advance and actuate a brake cable, a non-rotating axially movable connection between the remotely-operated drive and the hollow shaft, and an axial advancing support between the hollow shaft on the one side and the housing on the other side via at least one elastic element stationary relative to the spindle shaft and the brake cable and arranged in parallel in the direction of hollow shaft loaded axially by the advancing support and thereby axially deformable.

"The object can also be achieved by a motor vehicle parking brake, comprising a drive unit featuring a remotely-operated drive, a telescopic device movable axially in a housing or similar in a longitudinal axis of the setting unit, containing a hollow shaft and a spindle shaft connected to it in a manner that enables it to rotate and advance and actuate a brake cable, a non-rotating axially advanceable connection between the remotely-operated drive and the hollow shaft, and an axially advancing support between the hollow shaft on the one side and the housing one the other side via at least elastic element stationary relative to the spindle shaft and the brake cable during a drive into the release position of the brake of an axially loaded and thereby axially longitudinally deformable elastic element.

"A setting device may further comprise an electric motor for the remotely-operated drive and/or a transmission between the remotely-operated drive and the hollow shaft. A setting device may further comprise an intermediate gear wheel between a drive gear element of the remotely-operated drive and a drive gear wheel of the hollow shaft; and an axial movement option between the intermediate gear wheel and the meshing drive gear wheel of the hollow shaft at least to the extent of the operational stroke distance of the at least one elastic element. The at least one elastic element can be used as a correspondingly axially moved force sensor emitter for its longitudinal deformation for the axial advancing force acting from the motorized drive via the hollow shaft on the spindle shaft. A setting device may further comprise a force sensor receiver which is stationary relative to the spindle shaft and the brake cable and assigned to the force sensor emitter and which can be in the form of a Hall chip assigned to the magnetic force sensor emitter. A setting device may further comprise an arrangement of the force sensor receiver as an integrated part of a control unit of the setting unit, which can be accommodated by a fixed circuit board. The control unit can be arranged in the area of the telescopic device. The at least one elastic element can be embodied as a spring screw. The at least one elastic element can be arranged or embodied as a spring screw surrounding the hollow shaft concentric to the hollow shaft or the spindle shaft especially in its opposite direction of rotational advance. The at least one elastic element can be embodied as a compression spring element. At least one elastic element can be embodied as a tension spring element. The at least one elastic element can be used as a force sensor emitter for determining the brake application force of a motor vehicle parking brake. The at least one elastic element can be used as a force sensor emitter for determining the brake release force of a motor vehicle parking brake. A first elastic element can be loaded axially by advancing support for an axial advancing movement of the telescopic device, on application of a motor vehicle parking brake; and a second elastic element can be loaded axially in the other axial direction of movement of the telescopic device by advancing support, on release of a motor vehicle parking brake. A setting device may further comprise a different elasticity constant of the first elastic element by comparison with the elasticity constant of the second elastic element. A setting device may further comprise a loading of the second elastic element after previous unloading of the first elastic element. A setting device may further comprise a zero point detection between the transition of the unloading of the first elastic element on the one hand and the loading of the second elastic element on the other hand. A setting device may further comprise an arrangement of the second elastic element axially before or after the first elastic element. A setting device may further comprise a concentric arrangement in relation to each other of the first elastic element and of the second elastic element. A setting device may further comprise an embodiment of the at least one elastic element as a pressure compression element, with different compression spring constants by comparison with the tension spring element constant.

"The arrangement of the elastic element in the area of the hollow shaft, especially in the form of a spring screw concentrically surrounding the hollow shaft and the spindle shaft, allows a compact design, in particular an axial design, to be easily achieved.

"By embodying the at least one elastic element both as a compression spring element and also as a tension spring element, a force measurement and thereby brake cable monitoring is advantageously made possible both on application and also on release of the brake; In accordance with an advantageous embodiment of the invention, it is possible to separate the application force measurement from the release force measurement while retaining a compact design by using two spring screws arranged concentrically to each other. A further separation option while retaining a compact design is advantageously possible by arranging the second elastic element in the space to be kept free for the lifting movement of the spindle shaft, with the end of the spindle shaft being able to penetrate into the interior of the elastic element embodied as the spring screw.

"The parallel, especially concentric, compact and simple design provided by the arrangement of the at least one elastic element can be even further refined by a force sensor receiver assigned to the force sensor emitter moved on axial deformation of the support being able to be fixed or contacted in the vicinity of the telescopic device, e.g. integrated on a shared circuit board, without the need for longer lines laid to provide flexibility.

BRIEF DESCRIPTION OF THE DRAWINGS

"The invention as well as further advantageous embodiments in accordance with features of the subclaims are explained in more detail below with reference to schematic exemplary embodiments in the drawing; The Figures show:

"FIG. 1 an inventive setting device in a perspective axial part longitudinal section;

"FIG. 2 the setting device shown in FIG. 1 with the control unit and force sensor unit removed for the sake of clarity;

"FIGS. 3, 4 the setting device according to FIG. 1 with the brake cable applying the brake in an overall axial longitudinal section and in an enlarged section in the force sensor area;

"FIGS. 5, 6 the setting device according to FIGS. 3, 4 with the brake cable released in an overall axial longitudinal cross section and in an enlarged section in the force sensor area;

"FIGS. 7, 8 the setting device according to FIG. 1 in the brake setting with a first elastic element for brake application sensing and second elastic element supported axially to it for brake release sensing in an overall axial longitudinal cross section and in an enlarged section in the force sensor area;

"FIGS. 9, 10 the setting device according to FIGS. 7, 8 with a brake cable blocked on attempted release in an overall axial longitudinal cross section and in an enlarged section in the force sensor area;

"FIGS. 11, 12 the setting device to FIG. 1 in the brake setting with a first elastic element for brake application sensing and a second elastic element concentric with it for brake release sensing in an overall axial longitudinal cross section and in an enlarged section in the force sensor area;

"FIGS. 13, 14 the setting device according to FIGS. 11, 12 with a brake cable blocked on attempted release in an overall axial longitudinal cross section and in an enlarged section in the force sensor area;

"FIGS. 15, 16 the setting device in accordance with FIG. 1 with a single elastic element for brake release sensing with the brake cable applied in an overall axial longitudinal cross section and in an enlarged section in the force sensor area;

"FIGS. 17, 18 the setting device in accordance with FIGS. 15, 16 with the brake cable blocked on attempted release in an overall axial longitudinal cross section and in an enlarged section in the force sensor area."

For additional information on this patent application, see: Deutloff, Norbert; Kraft, Ekkehard; Roos, Stephan; Sauer, Armin. Setting Device, Particularly a Motor Vehicle Parking Brake. Filed February 13, 2014 and posted August 28, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=6501&p=131&f=G&l=50&d=PG01&S1=20140821.PD.&OS=PD/20140821&RS=PD/20140821

Keywords for this news article include: Circuit Board, Electronics, Patents.

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Source: Electronics Newsweekly


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