Device for machining a disc

Abstract

A device (20) for machining a disk (100) for a safety test comprises a housing (30), positioning means (32) and a planetary gear (40), wherein the planetary gear (40) comprises a sun gear arrangement (50) and a planetary gear arrangement (60), wherein the positioning means (32) are connected to the housing (30) and are designed to enable positioning of the device (20) on a disk (100), wherein the housing (30) has, on the inside, a housing-fixed toothing (34), wherein the sun gear arrangement (50) comprises a drivable sun gear axle (51) with a sun gear (52) and with a first grinding disc (54) at one end (56), wherein the sun gear axle (51) is rotatably mounted relative to the housing (30), wherein the planetary gear arrangement (60) comprises a planetary axle (61) with a planet gear (62) and with a second grinding disc (64) at one end (66),and wherein the planetary gear (62) is in engagement with the sun gear (52) and with the housing-fixed toothing (34) to enable rotation of the planetary gear axis (60) about the sun gear axis (50) upon rotation of the sun gear axis (50).

Description

[0001] The invention relates to a device for processing a pane for a safety test.

[0002] CN 113 928 259 B shows a collision damping device for vehicles.

[0003] FR 3 089 470 B1 shows a motor vehicle with a dashboard that is automatically extended when a pedestrian hits it.

[0004] DE 10 2011 111 237 A1 shows a body with a front cross member, the front edge of which supports a lower edge of the windscreen.

[0005] CH 345 263 A shows a hand-held device for grinding and polishing, in which a gear or a ring with an internal toothing is firmly connected to a device body, on which three toothed satellites can roll.

[0006] DE 44 47 162 A1 shows a device for machining a surface with a grinding or polishing tool, in which a housing is provided with a drive device by means of which the tool can be driven and rotated about its longitudinal axis.

[0007] US 2 854 829 A shows a machining plate that can be connected to a drilling machine via a ball joint.

[0008] It is therefore an object of the invention to provide a new device for processing a pane for a safety test.

[0009] This problem is solved by the subject matter of the independent claim.

[0010] A device for machining a disk for a safety test comprises a housing, positioning means, and a planetary gear mechanism. The planetary gear mechanism comprises a sun gear arrangement and a planetary gear arrangement. The positioning means are connected to the housing and are designed to enable positioning of the device on a disk. The housing has a housing-fixed toothing on its inside. The sun gear arrangement comprises a drivable sun gear axle with a sun gear and a first grinding disc at one end of the sun gear axle. The sun gear axle is rotatably mounted relative to the housing. The planetary gear arrangement comprises a planetary axle with a planetary gear and a second grinding disc at one end of the planet gear axle. The planetary gear is in engagement with the sun gear and the toothing fixed to the housing.to allow the planetary gear axis to rotate around the sun gear axis when the sun gear axis rotates. The device enables the creation of a well-defined and easily reproducible grinding pattern on a wheel.

[0011] According to a preferred embodiment, the sun gear axle extends through the housing, and a crank is provided on the sun gear axle on the outside of the housing. This allows the crank to be actuated from the outside.

[0012] According to a preferred embodiment, the device comprises an electric motor designed to drive the sun gear shaft. The electric motor can be started, for example, by a switch and perform the grinding process according to a predetermined program.

[0013] According to a preferred embodiment, the device comprises a spacer device, wherein the spacer device is designed to create a predetermined distance between the sun gear axis and the planet gear axis. The relative movement is thereby predetermined in a controlled manner.

[0014] According to a preferred embodiment, the positioning means comprise suction cups. Suction cups enable a secure connection to a pane.

[0015] According to a preferred embodiment, the sun gear axle comprises a first sun gear axle section, a second sun gear axle section, and a first spring. The second sun gear axle section encompasses the first grinding disc and is axially displaceable relative to the first sun gear axle section. The first sun gear axle section and the second sun gear axle section are subjected to a force relative to one another by the first spring in order to influence the contact pressure of the first grinding disc on a wheel. This allows the contact pressure to be well defined, resulting in a readily reproducible grinding pattern.

[0016] According to a preferred embodiment, the preload of the first spring is adjustable. The contact pressure can thereby be adjusted.

[0017] According to a preferred embodiment, the planetary gear axle comprises a first planetary gear axle section, a second planetary gear axle section, and a second spring. The second planetary gear axle section encompasses the second grinding disc and is axially displaceable relative to the first planetary gear axle section. The first planetary gear axle section and the second planetary gear axle section are subjected to a force relative to one another by the second spring in order to influence the contact pressure of the second grinding disc on a disk. This allows the contact pressure to be well defined, resulting in a well-reproducible grinding pattern.

[0018] According to a preferred embodiment, the preload of the second spring is adjustable. The contact pressure can thereby be adjusted.

[0019] According to a preferred embodiment, the sun gear axle is designed as a hollow axle and is configured to allow the positioning of the device on a disk to be checked through the hollow axle. Positioning can be greatly facilitated.

[0020] According to a preferred embodiment, the first grinding disc is connected to the sun gear axis via a first ball joint to enable a tilting movement of the first grinding disc and thus an adaptation to the surface of a curved disc.

[0021] According to a preferred embodiment, the second grinding disc is connected to the planetary gear axle via a second ball head joint in order to enable a tilting movement of the second grinding disc and thus an adaptation to the surface of a curved disc.

[0022] According to a preferred embodiment, - the first grinding disc, - the second grinding disc, or - The first sanding pad and the second sanding pad each have a foam layer. This influences the contact pressure.

[0023] According to a preferred embodiment, - the first grinding disc, - the second grinding disc, or - the first sanding disc and the second sanding disc each have an abrasive, the abrasive preferably being sandpaper.

[0024] According to a preferred embodiment, the abrasive is detachably attached to the associated first or second sanding disc, in particular via a hook-and-loop connection. This allows for easy replacement of the abrasive.

[0025] Further details and advantageous developments of the invention will become apparent from the exemplary embodiments described below and illustrated in the drawings, which are in no way to be understood as limiting the invention, as well as from the dependent claims. It is understood that the features mentioned above and those to be explained below can be used not only in the respective combinations specified, but also in other combinations or on their own, without departing from the scope of the present invention. It shows: Fig. 1 in a three-dimensional representation of a device for processing a disc, Fig. 2 in a longitudinal section the device positioned on a disc of Fig. 1, Fig. 3 in a schematic cross-section the device of Fig. 1, Fig. 4 shows a schematic top view of the device of Fig. 1 on a disc, and Fig. 5 in a schematic longitudinal section a grinding disc with an axis.

[0026] In the following, identical or functionally identical parts are provided with the same reference symbols and are usually described only once. The description builds on each figure to avoid unnecessary repetition.

[0027] Fig. 1 shows a device 20 for processing a pane 100 for a safety test.

[0028] The device 20 has a housing 30 and positioning means 32.

[0029] The positioning means 32 are connected to the housing 30 and are designed to enable positioning of the device 20 on the disc 100.

[0030] Preferably, the positioning means 32 comprise suction cups. This allows the device 20 to be temporarily released.

[0031] Preferably, the positioning means 32 are formed entirely or partially as rubber parts or elastic parts. This allows the device 20 to be pressed against the pane, and the high static or sliding friction of the rubber parts prevents lateral displacement of the device 20.

[0032] A crank 58 is provided on an outer side 92 of the housing 30 and enables the manual drive of a sun gear axle 51.

[0033] The sun gear axle 51 is preferably designed as a hollow axle, and the positioning of the device 20 on the glass pane can be checked through an opening 37, as is illustrated by a schematically indicated eye 110.

[0034] Fig. 2 shows a longitudinal section of the device 20 positioned on the disc 100.

[0035] The pane is preferably a glass pane, in particular a laminated glass pane, such as is used as a windscreen or rear window of a vehicle.

[0036] Laminated glass panes have an outer pane, an inner pane and a film between the outer pane and the inner pane.

[0037] The device 20 has a planetary gear 40.

[0038] The planetary gear 40 has a sun gear arrangement 50 and a planet gear arrangement 60.

[0039] The housing 30 has a toothing 34 fixed to the housing on the inner side 91.

[0040] The sun gear assembly 50 has a drivable sun gear axle 51 with a sun gear 52 and a grinding wheel 54 at one end 56. The sun gear axle 51 is rotatably mounted relative to the housing 30.

[0041] The planetary gear arrangement 60 has a planetary axle 61 with a planetary gear 62 and with a grinding disc 64 at one end 66.

[0042] The planetary gear 62 is in engagement with the sun gear 52 and with the housing-fixed toothing 34 in order to enable rotation of the planetary gear axis 60 around the sun gear axis 50 when the sun gear axis 50 rotates.

[0043] The sun gear axis 51 extends through the housing 30, and a crank 58 is provided on the sun gear axis 51 on the outer side 92 of the housing 30.

[0044] Alternatively, the device 20 may comprise a schematically indicated electric motor 59 which is designed to electrically drive the sun gear axle 51.

[0045] The device 20 preferably includes a spacer device 70. The spacer device 70 is designed to establish a predetermined distance between the sun gear axis 51 and the planet gear axis 61. This results in a secure relative position of the individual components. Alternatively, the axial position of the individual components 50, 60 can be fixed, and the radial position is also defined thereby.

[0046] The sun gear axle 51 is preferably designed as a hollow axle and is configured to allow the positioning of the device 20 on the disk 100 to be checked through the hollow axle. For example, a light can be positioned at the desired location inside the vehicle, and the device 20 can be aligned with the light through the hollow axle.

[0047] The device 20 is used to process the window 100 before a crash test.

[0048] To minimize damage in traffic accidents involving pedestrians, the windshield is one of the components of a motor vehicle that requires special attention. Depending on the size of the pedestrian and the vehicle, the head of the injured pedestrian can strike the windshield. The demands placed on a windshield are therefore high. Firstly, the windshield must protect the driver from environmental influences, such as stone chips, during normal operation of the vehicle. The windshield must also be sufficiently stable so that it is not structurally damaged every time it is hit by an object. Furthermore, in the event of an accident, the windshield must break in such a way that no sharp edges are created. Finally, in a pedestrian accident, the windshield must break as precisely and consistently as possible so that it absorbs a high level of kinetic energy to protect the pedestrian.

[0049] Modern windshields made of laminated safety glass offer a high level of comfort and safety. However, if a windshield is already structurally damaged, its crack resistance and rigidity are compromised. In some circumstances, the pre-damaged windshield may barely absorb any kinetic energy in a pedestrian collision, causing the pedestrian's head to strike a vehicle component located beneath the windshield.

[0050] Such a head impact, which represents the most dangerous scenario in a pedestrian accident, is realized in collision tests by grinding the windshield under test. This creates small cracks that pre-damage the windshield structure and lead to a defined failure of the windshield upon impact with a dummy head.

[0051] In practice, the windshield sanding process is currently performed manually by test bench personnel using sandpaper. There are few guidelines and, in particular, no way to ensure that the sanding process is carried out in a defined and repeatable manner.

[0052] During development, the disc 100 is ground with the device 20 for testing, creating microscopically fine cracks in the disc 100. This allows for early and defined breakage of the disc 100 in the event of a collision with the dummy head. Upon impact, the dummy head destroys the disc 100 and subsequently impacts components below the disc 100, particularly the instrument panel. This results in maximum force acting on the dummy head. Through such tests, the shape of the instrument panel can be investigated and improved for better protection in the event of a collision.

[0053] Fig. 3 shows a schematic representation of a cross section through the device 20.

[0054] The central sun gear axis 51 enables a rotation 81 of the grinding disc 54 around the sun gear axis 51 and thus a central grinding of the disk 100. The planetary axis 52 is guided in a circle around the central sun gear axis 51 by the planetary gear 40 as indicated by the arrow 82, and at the same time the grinding disc 64 rotates around the planetary axis 52 as indicated by the arrow 83.

[0055] Fig. 4 shows that the movement of Fig. 3 resulting grinding pattern with a central grinding area 84 and a grinding path 85 moving around the central grinding area 84.

[0056] Fig. 5 shows a detail of the sun gear axis 51. The planet gear axis 61 is preferably constructed accordingly.

[0057] The sun gear axle 51 has a first sun gear axle section 511, a second sun gear axle section 512 and a spring 513, wherein the second sun gear axle section 512 comprises the grinding plate 54 and is axially displaceable relative to the first sun gear axle section 511, and wherein the first sun gear axle section 511 and the second sun gear axle section 512 are acted upon by the spring 513 relative to one another with a force in order to influence a contact pressure of the grinding plate 54 on the disk 100.

[0058] The preload of spring 513 is preferably adjustable. In the exemplary embodiment, a threaded nut 515 that can be adjusted by rotation engages a thread 515 provided on the first sun gear axle section 511, and spring 513 bears against threaded nut 515.

[0059] The grinding disc 54 is connected to the sun gear axle 51 via a ball joint 541 to enable a tilting movement of the first grinding disc 54 and thus an adaptation to the surface of a curved disc 100.

[0060] Accordingly, the planetary gear axle 61 has a first planetary gear axle section 611, a second planetary gear axle section 612 and a spring 613, wherein the second planetary gear axle section 612 comprises the second grinding plate 64 and is axially displaceable relative to the first planetary gear axle section 611, and wherein the first planetary gear axle section 611 and the second planetary gear axle section 612 are acted upon by the spring 613 relative to one another with a force in order to influence a contact pressure of the grinding plate 64 on the disk 100.

[0061] The preload of spring 613 is preferably adjustable. In the exemplary embodiment, a threaded nut 615, which can be adjusted by rotation, engages with a thread 615 provided on the first planetary gear axle section 611, and spring 613 bears against threaded nut 615.

[0062] The grinding disc 64 is connected to the planetary gear axle 61 via a second ball head joint 641 in order to enable a tilting movement of the grinding disc 64 and thus an adaptation to the surface of a curved disc 100.

[0063] The sanding plate 54 and / or the sanding plate 64 preferably have a foam layer 542 or 642, respectively. This allows the angle of an abrasive 543 or 643 to be adjusted to the surface of the disk 100.

[0064] Abrasives 543 and 643 preferably comprise sandpaper. The backing need not be made of paper, but can also be made of plastic.

[0065] Preferably, the abrasives 543, 643 are detachably attached to the associated sanding disc 54, 64, in particular via a hook-and-loop connection or a bayonet closure.

[0066] Naturally, numerous variations and modifications are possible within the scope of the present invention.

Claims

[1] Device (20) for processing a disc (100) for a safety test, wherein the device (20) comprises a housing (30), positioning means (32) and a planetary gear (40), wherein the planetary gear (40) comprises a sun gear arrangement (50) and a planetary gear arrangement (60), wherein the positioning means (32) are connected to the housing (30) and are designed to enable positioning of the device (20) on a disc (100), wherein the housing (30) has a housing-fixed toothing (34) on the inside, wherein the sun gear arrangement (50) has a drivable sun gear axle (51) with a sun gear (52) and with a first grinding plate (54) at a sun gear axle end (56), wherein the sun gear axle (51) is rotatably mounted relative to the housing (30), wherein the planetary gear arrangement (60) has a planetary axle (61) with a planetary gear (62) and with a second grinding plate (64) at a planetary gear axle end (66), wherein the planetary gear (62) is in engagement with the sun gear (52) and with the housing-fixed toothing (34) in order to enable rotation of the planetary gear axis (60) about the sun gear axis (50) upon rotation of the sun gear axis (50). [2] Device (20) according to claim 1, in which the sun gear axis (51) extends through the housing (30), and in which a crank (58) is provided on the sun gear axis (51) on the outer side (92) of the housing (30). [3] Device (20) according to claim 1, which comprises an electric motor (59), which electric motor (59) is designed to drive the sun gear axle (51). [4] Device (20) according to one of the preceding claims, which has a spacer device (70), wherein the spacer device (70) is designed to effect a predetermined distance between the sun gear axis (51) and the planet gear axis (61). [5] Device (20) according to one of the preceding claims, in which the positioning means (32) comprise suction cups. [6] Device (20) according to one of the preceding claims, in which the sun gear axle (51) has a first sun gear axle section (511), a second sun gear axle section (512) and a first spring (513), wherein the second sun gear axle section (512) comprises the first grinding plate (54) and is axially displaceable relative to the first sun gear axle section (511), and wherein the first sun gear axle section (511) and the second sun gear axle section (512) are acted upon by the first spring (513) relative to one another with a force in order to influence a contact pressure of the first grinding plate (54) on a disk (100). [7] Device (20) according to claim 6, wherein the preload of the first spring (513) is adjustable. [8] Device (20) according to one of the preceding claims, in which the planetary gear axle (61) has a first planetary gear axle section (611), a second planetary gear axle section (612) and a second spring (613), wherein the second planetary gear axle section (612) comprises the second grinding plate (64) and is axially displaceable relative to the first planetary gear axle section (611), and wherein the first planetary gear axle section (611) and the second planetary gear axle section (612) are acted upon by the second spring (613) relative to one another with a force in order to influence a contact pressure of the second grinding plate (64) on a disk (100). [9] Device (20) according to claim 8, wherein the preload of the second spring (613) is adjustable. [10] Device (20) according to one of the preceding claims, in which the sun gear axle (51) is designed as a hollow axle and is adapted to enable a check of the positioning of the device (20) on a disc (100) through the hollow axle. [11] Device (20) according to one of the preceding claims, in which the first grinding plate (54) is connected to the sun gear axis (51) via a first ball joint (541) in order to enable a tilting movement of the first grinding plate (54) and thus an adaptation to the surface of a curved disc (100). [12] Device (20) according to one of the preceding claims, in which the second grinding plate (64) is connected to the planetary gear axle (61) via a second ball joint (641) in order to enable a tilting movement of the second grinding plate (64) and thus an adaptation to the surface of a curved disc (100). [13] Device (20) according to one of the preceding claims, in which - the first grinding disc (54), - the second grinding disc (64), or - the first sanding plate (54) and the second sanding plate (64) each have a foam layer (542; 642). [14] Device (20) according to one of the preceding claims, in which - the first grinding disc (54), - the second grinding disc (64), or - the first grinding plate (54) and the second grinding plate (64) each have an abrasive (543; 643), wherein the abrasive (543; 643) is preferably sandpaper. [15] Device (20) according to claim 14, wherein the abrasive means (543; 643) is detachably attached to the associated first or second grinding plate (54; 64), in particular via a hook and loop connection.

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