Sensor mounting for a sensor for object detection

A sensor mounting for a sensor for object detection includes a housing for the sensor, a holder on which the housing is pivotably held, an adjusting device for an angular orientation of the housing and an angular gear mechanism for controlling the adjusting device. The angular gear mechanism includes a drive wheel and a driven wheel, the drive wheel being connected to an engagement contour for the transmission of torque to the drive wheel, and a gear mechanism housing of the angular gear mechanism being set up so as to permit mounting of the drive wheel at different sides of the angular gear mechanism.

CROSS REFERENCE TO RELATED APPLICATION

The present application is the national stage entry of International Patent Application No. PCT/EP2012/056410, filed on Apr. 10, 2012, which claims priority to Application No. DE 10 2011 077 255.3, filed in the Federal Republic of Germany on Jun. 9, 2011.

FIELD OF INVENTION

The present invention relates to a sensor mounting for a sensor for object detection, in particular for a radar sensor. In particular, the present invention relates to a sensor mounting for a sensor for object detection for motor vehicles, in particular for driver assistance systems. In addition, the present invention relates to a sensor unit having a sensor mounting, and to an assembly kit for a sensor mounting.

BACKGROUND INFORMATION

Radar sensors are used in motor vehicles for distance measurement and/or speed measurement of objects. For example, driver assistance systems are known in the form of travel speed regulators for motor vehicles having a radar system for locating a vehicle traveling in front and for measuring the distance therefrom. Such a distance regulating system is also referred to as an ACC system (Adaptive Cruise Control).

In order to ensure the proper functioning of radar sensors, after being mounted in the vehicle they must be oriented toward the roadway, or toward the desired region of detection, within specified limits. For example, for a radar sensor for a system for adaptive travel speed regulation, standardly an orientation of a main direction of radiation of the radar sensor at a precisely defined angle to the vehicle longitudinal axis is required, for example parallel to the vehicle longitudinal axis. Through such an orientation, it is possible to compensate, for example, manufacturing-related tolerances of the mechanical components of the radar sensor, as well as tolerances in the fastening to the motor vehicle.

For a radar sensor for object detection, in particular an orientation or adjustment of an angle of inclination of a main direction of radiation of the radar sensor is important. This angle is also referred to as elevation.

Adjusting devices are known for adjusting a radar sensor in the vertical direction, i.e., with regard to the elevation angle, in which an adjusting screw can be used to modify the angle of inclination of the radar sensor.

SUMMARY

In known adjusting devices for motor vehicle radar sensors, in which an adjustment takes place via a rotational movement of an adjusting screw, in order to make the adjustment this screw must be accessible at the location of installation in the motor vehicle. This accessibility must correspondingly be provided in the construction of the radar sensor and/or in the design of the area in which it is installed. For different installation situations, therefore, it may be necessary to redesign a radar sensor or its mounting device.

An object of the present invention is to create a sensor mounting having an adjusting device for a sensor for object detection that enables different adjustment designs.

The object is achieved by a sensor mounting for a sensor for object detection having a housing for the sensor, a holder on which the housing is pivotably held, an adjusting device for an angular orientation of the housing, and an angular gear mechanism for controlling the adjusting device, the angular gear mechanism having a drive wheel and a driven wheel, the drive wheel being connected to an engagement contour for the transmission of torque to the drive wheel, and a gear mechanism housing of the angular gear mechanism being set up so as to permit installation of the drive wheel at different sides of the angular gear mechanism.

In this way, in a situation of installation having a specified orientation of the sensor housing, it is easy to provide the possibility of adjustment at the corresponding side by installing the drive wheel at one of the different sides. A particular advantage of this adjustment design is that an adjustment of the sensor at a desired side can be provided without making constructive changes to the components of the sensor mounting.

Preferably, the drive wheel can be mounted at a plurality of positions, angle-offset from one another, on the circumference of the driven wheel. In this way, in particular in the case of an angular gear mechanism having a drive wheel and driven wheel a mounting of the drive wheel at various circumferential positions of the driven wheel can be provided in a particularly easy manner.

In particular, the gear mechanism housing can permit a mounting of the drive wheel at different sides of the angular gear mechanism, in each case in a position in which the drive wheel stands in engagement with the driven wheel and the engagement contour is situated on an outer side of the gear mechanism housing. In this way, the engagement contour can be situated on the corresponding side so as to be accessible.

Preferably, the gear mechanism housing has a first housing part and a second housing part, and the drive wheel is situated between the first housing part and the second housing part. In this way, for example the drive wheel can be situated at the desired side during installation of the gear mechanism housing in a particularly simple manner. The second housing part is for example connected to the holder via the first housing part. The first housing part is for example connected to the holder.

Preferably, the gear mechanism housing forms a bearing for the drive wheel, particularly preferably a sliding bearing. For example, the first housing part and/or the second housing part can have at least one receptacle for bearing the drive wheel.

Preferably, the second housing part has a receptacle for bearing the drive wheel, and a gear mechanism housing is set up so as to permit an installation of the second housing part with receptacle positioned at different sides of the angular gear mechanism. For example, the second housing part can be capable of being mounted on the first housing part in various positions in which the receptacle is positioned at, in each case, different sides of the angular gear mechanism. Thus, for example the first housing part can be situated in a specified position relative to the holder, while for example the second housing part permits an adaptation of the gear mechanism housing to the different installation positions of the drive wheel.

Preferably, the angular gear mechanism is a bevel gear mechanism. Particularly preferably, the drive wheel and the driven wheel are meshed bevel gears. In this way, a particularly precise transmission of torque can take place.

In a preferred exemplary embodiment, the adjusting device has a rotatable disk that can be controlled by the angular gear mechanism, the disk having a guide link running in a spiral shape in which there engages a radially movable pin. This enables a large gear reduction, as well as self-locking of the adjusting device. Moreover, it is particularly advantageous that in a very small space the rotational movement of the driven wheel can be converted into a radial movement of the pin. For example, the pin works together with the guide link such that when the rotation of the disk forces a relative movement between the disk and the pin, the pin is controlled in the radial direction.

The disk can for example be connected to the driven wheel, in particular connected in one piece. For example, a first side of the disk can have the guide link, and a second side of the disk can form the driven wheel.

The pin is preferably coupled to the housing. For example, the pin is situated on the housing. For example, the pin can be connected fixedly to the housing.

In addition, the object is achieved by an assembly kit for a sensor mounting of the type described, in which the drive wheel can be mounted at different sides of the angular gear mechanism. In particular, preferably the drive wheel can be mounted at different sides of the angular gear mechanism in each case in a position in which it stands in engagement with the driven wheel, and the engagement contour is situated on an outer side of the gear mechanism housing. The assembly kit can for example include the drive wheel and the above-named second housing part, the drive wheel being capable of being mounted between a first housing part and the second housing part of the gear mechanism housing.

In the following, a preferred exemplary embodiment of the present invention is explained in more detail with reference to the accompanying drawings.

DETAILED DESCRIPTION

FIG. 1shows a sensor unit having a sensor mounting10and a radar sensor12that has a housing14. Radar sensor12is a radar sensor for a driver assistance system of a motor vehicle, in particular for a driving speed regulator.

Sensor housing14is pivotably suspended, by pins16, on a holder18of sensor mounting10. Holder18forms a frame that runs around housing14. The frame has side parts that are connected to one another above and/or under the housing, and on which sensor housing14is suspended. In the front view shown inFIG. 1, the main direction of radiation of radar sensor12runs out from the plane of the drawing. Housing14is pivotable about a horizontal transverse axis A. At the location of installation in a motor vehicle, the sensor mounting is mounted on the motor vehicle by fastening holder18to the motor vehicle, for example using fastening devices20, situated on holder18, in the form of fastening clips.

When radar sensor12situated in housing14pivots about pivot axis A, the angle of inclination of the main direction of radiation of the radar sensor changes relative to the horizontal. In order to adjust this angular orientation, sensor mounting10has an adjusting device22that is controlled via an angular gear mechanism24.

Adjusting device22includes a pin26that stands out from housing14at a side of housing14, and is fixedly connected thereto. Pin26extends in a direction that is transverse to pivot axis A of housing14and transverse to the main direction of radiation of radar sensor12. In the vertical direction, pin26is situated at a distance from pivot axis A.

Adjusting device22further includes a rotatably mounted disk28that is rotatable about an axis of rotation running transverse to the main direction of radiation of radar sensor12and to pivot axis A of housing14. On a side facing pin26, disk28has a guide link30, running in the shape of a spiral, for pin26, as shown schematically inFIG. 2. Pin26engages without play in guide link30. In this way, when disk28is motionless, the position of pin26is defined, so that the angular orientation of housing14about its pivot axis is defined, and thus the main direction of radiation of radar sensor12has a particular angular position relative to the horizontal. When disk28is rotated into a different position, pin26guided in guide link30then moves into a different radial position relative to disk28, and at the same time pivots housing14about its pivot axis. This is because pin26is movable only in the radial direction relative to disk28, due to the suspension of housing14on holder18.

Thus, pin26works together with guide link30such that when there is a relative movement, forced by rotation of disk28, between disk28and pin26, pin26is controlled in the radial direction and housing14is pivoted about its pivot axis. Pin26, guide link30, and the suspension of housing14on holder18thus form a mechanism for converting a rotational movement of disk28into a pivot movement of housing14about a horizontal pivot axis. Due to the spiral-shaped course of guide link30, there results a strong gear reduction as well as self-locking of the adjusting device. This enables a fine adjustment of the inclination of the main direction of radiation of radar sensor12.

On the side facing away from pin26, disk28forms a gear in the form of a bevel gear of angular gear mechanism24. The bevel gear represents a driven wheel32of angular gear mechanism24. Driven wheel32works together with a second bevel gear that forms a drive wheel34of angular gear mechanism24. Intermeshed drive and driven wheels34,32have axes that stand at an angle of 90° to one another. The diameter of driven wheel32is greater than the diameter of drive wheel34, so that a further gear reduction results. Drive wheel34is mounted rotatably on a side wall of a gear mechanism housing36.

An axial pin38of drive wheel34has an engagement contour40for the immediate transmission of torque to drive wheel34. Engagement contour40is free at a side of gear mechanism housing36. Engagement contour40is for example an insertion attachment for a screwdriver or screw wrench. Engagement contour40can for example include an inner hexagonal profile.

Driven wheel32is also mounted rotatably on gear mechanism housing36. Drive wheel34and driven wheel32mesh with one another and form a gear mechanism without play, in the form of a bevel gear mechanism.

By rotating drive wheel34, for example using a screwdriver, driven wheel32is at the same time rotated with disk28, so that pin26is moved radially and housing14is pivoted.

A locking hook41A situated on a flexible arm is situated alongside disk28, and lies against the circumferential edge of disk28. Locking hook41A is connected to gear mechanism housing36via the arm. Disk28has locking indentations41B on its circumference, at regular intervals. Locking indentations41B permit locking hooks41A to lock in. For example, a rotation of driven wheel32, and thus of disk28, from one locking indentation41B to the next corresponds in each case to a pivoting of the housing by 0.5°. Thus, the locking device formed by locking hook41A and locking indentations41B brings about a perceptible locking of the angular gear mechanism at angular orientations of the housing spaced at regular angular intervals of 0.5°. The locking device situated on the driven wheel enables a “blind” adjustment to be carried out. Such a locking device can also be situated on the drive wheel or at a different location of the angular gear mechanism.

As described in the following, gear mechanism housing36is set up to permit a mounting of drive wheel34on different sides of angular gear mechanism24.

Gear mechanism housing36has a first housing part36A and a second housing part36B. First housing part36A is fixedly connected to holder18, and forms a bearing for driven wheel32. Second housing part36B forms a cap of the gear mechanism housing and can be placed onto first housing part36A. It is then connected to holder18via first housing part36A.

FIG. 3schematically shows drive wheel34and first and second housing parts36A,36B, before installation. For example, an assembly kit for sensor mounting10can include second housing part36B, detached from first housing part36A or detachably connected thereto. Second housing part36B can be mounted on first housing part36A for example using fastening devices42,44in the form of locking devices.FIG. 3schematically shows locking dogs42and corresponding engagement contours44that work together therewith. For example, second housing part36B can be clipped onto first housing part36A.

In the mounted position shown inFIG. 1, second housing part36B is detachably connected to first housing part36A by fastening devices42,44. Here, drive wheel34is situated between first and second housing parts36A,36B. First housing part36A has, at four positions offset by angles of 90°, receptacles46for mounting drive wheel34at four different sides of the gear mechanism housing. In this way, drive wheel34can be mounted at the corresponding positions offset by 90° on the circumference of driven wheel32. InFIG. 1, drive wheel34is mounted on a left side, and alternative mounting positions are shown in broken lines.

In the described example, second housing part36B has only a single receptacle48for bearing drive wheel34. Receptacles46,48each for example form a half bearing shell for an axial pin of drive wheel34. At the other sides, second housing part36B is provided with tongues50that, when mounted on first housing part36A, close receptacles46, which are not required. Depending on the desired position of drive wheel34, second housing part36B is mounted on first housing part36A in a correspondingly oriented position. In this way, gear mechanism housing36is set up to permit a mounting of second housing part36B with receptacle48positioned at different sides of angular gear mechanism24. By correspondingly mounting the angular gear mechanism, the sensor mounting can be configured for example so that it can be adjusted from the left, from the right, from the front, or from the rear.

In addition, an axial pin52of driven wheel32is connected to an engagement contour54for the immediate transmission of torque to driven wheel32. Second housing part36B has an opening56through which axial pin52is led, so that engagement contour54is free. In the position shown inFIG. 1, an adjustment from below is thus additionally enabled, by transmitting a torque directly to driven wheel32via engagement contour54.

In the described adjustment design, an adjustment of sensor12is therefore possible from various sides without requiring constructive modifications. Rather, using the same components, during the installation of the sensor mounting it can be determined at which side the engagement contour for torque transmission is to be made accessible. Good adjustability results from the self-locking and gear reduction of the adjusting device and angular gear mechanism.