Abstract: Disclosed herein is a PM type step motor used to move a camera or an optical pickup lens of media related equipment. In the step motor, coupling holes are formed in the central portions of both sides of a casing unit thereof, a bushing is press-fitted or inserted into an associated coupling hole, and a ring member is press-fitted over the outer circumference of the bushing protruding outward from the coupling hole such that the bushing is secured to the casing unit, thus preventing the bushing from becoming separated from the casing unit. The step motor can be freely applied to peripheral device modules of various outer diameters using the ring member.

Abstract: The invention relates to a linear actuator (1), at least including a stator (3) that is placed within a cartridge-like casing (2), a bearing ring (4) with a bearing seat for mounting a rotor (5) with an antifriction bearing (6), a spindle (7) that on its drive side (7.1) is together with the rotor (5) designed as motion transformer to transform the rotary motion into a translatory motion and a flange (9) that closes the casing (2) on the output side (8) of the linear actuator (1), the flange (9) being equipped with an anti-rotation locking device for the spindle output side (7.2) that penetrates the flange (9). According to the invention the cartridge-like casing (2) is provided with several formed bending tongues (10.1, 10.2), whereby in assembled condition first bending tongues (10.1) engage with groove-like recesses (11) of the bearing ring (4) of the antifriction bearing (6) and second bending tongues (10.

Abstract: An electric motor includes an upper housing, a lower housing including a flange for mounting the upper housing thereon and a cone-shaped portion extending away from the flange and the upper housing. The electric motor further includes a stator assembly formed of a first core having a first height and fitted into the upper housing, a rotor assembly rigidly joined to a shaft to rotate therewith in the stator assembly and formed of a second core having a second height, and a hub connected to a lower end of the shaft to rotate therewith in relation to the cone-shaped portion. The hub is configured to secure an operable implement to the electric motor. The second height is greater than the first height.

Abstract: A system for enclosing an instrument, module or other assembly in an explosion-proof housing. The system includes an upper housing portion that includes a first threaded portion and, optionally, a transparent window portion; a lower housing portion that has a second threaded portion that is structured and arranged to cooperate with the first threaded portion to provide a tight, air- and water-tight fit; and an inner mounting assembly for supporting an instrument, module, electrical circuit, electrical device, display device, or other assembly. In pertinent part, the lower housing portion includes integrated bosses that provide horizontal surfaces for supporting the inner mounting assembly and for releasably attaching the inner mounting assembly to the lower housing portion.

Abstract: An electric motor is provided that is configured for operation in hazardous or other hazardous environments. The electric motor includes a housing for a rotor and a stator. The housing includes a pair of end caps and a casing positioned therebetween. The end caps and the casing are held together using internal tie bars extending between and connected to the end caps.

Abstract: A fluid pump assembly is disclosed for performing in a damp environment. A pump member is provided that drives a quantity of fluid. A pump housing encloses the pump member and includes a breather hole for circulating cooling air around the pump member during operation. A cover is provided that substantially covers the breather hole and defines a tortuous path that enables air to circulate through the breather hole while preventing entry of water thereto.

Abstract: A compressor has stator of a motor is installed in a closed container, on two planes normal to the center axis 1a of the container. On each of the planes, the stator is welded to the container at three welding points. This mounting arrangement on two planes with three welding points on each plane minimizes the amount of movement of the stator in the direction of the center axis.

Abstract: An electric motor comprising an annular stator core, a resin molding the stator core, a casing member housing the stator core, wherein the casing member has an opening, and the resin is filled into the opening.

Abstract: A motor includes a motor body and a housing for covering and accommodating the motor body. The housing includes a seat and a cover. The seat has at least one first connecting portion disposed at the circumference of the seat, and the cover has at least one second connecting portion disposed at the circumference of the cover and corresponding to the first connecting portion. The first and second connecting portions are connected by the relative movement of the seat and the cover, so that the seat and the cover can be combined tightly.

Abstract: A power tool has a motor having a stator made by separately forming pole pieces, return path pieces and field coils. The field coils are placed over necks of the pole path pieces and the return path pieces are affixed to the pole pieces. An armature having an outside diameter of at least 0.625 the outside diameter of the stator is placed in the stator. The field coils may be formed so that they extend beyond pole tips of the pole pieces.

Abstract: A motor includes a sleeve supporting a shaft such that an upper end of the shaft protrudes upwardly along an axial direction, a sleeve housing in which an outer diameter portion of the sleeve is inserted and supported, an oil sealing cap covering the sleeve at an opposite side of the sleeve housing, and having a sealing protrusion protruding from a top surface thereof to form a capillary seal of oil between the shaft and the sleeve, and a hub base pressure-fitted and fixed on the upper end of the shaft, and having a hub-base outer diameter portion facing the sealing protrusion and forming a first oil sealing part with the sealing protrusion.

Abstract: A motor assembly includes a housing, a revolving shaft revolvably mounted in the housing, a magnet mounting portion surrounding and rotatable with the revolving shaft, a magnet disposed on the magnet mounting portion, a magnetically inducible core having a plurality of stator poles spaced apart from rotor magnetic poles of the magnet, and a plurality of stator windings wound on the stator poles, respectively. The stator windings are spaced apart from end walls of the housing by axial intervals. A thermally conductive bridging member is disposed to span the axial intervals to conduct heat emanating from the stator windings to the end walls so as to dissipate heat out of the housing.

Abstract: A motor casing, including a hollow motor casing body. The wall of the motor casing body comprises a plurality of brackets and a plurality of grooves which are formed simultaneously by punching the wall of the motor casing body. The plurality of grooves is disposed one close to one of the brackets. One end of each bracket is coupled to the wall of the motor casing body. The motor casing has a simple structure, low cost, and reliable connection and requires less materials compared to conventional motor casings.

Abstract: A heat dissipating fan includes a housing having an air inlet and an air outlet between which an air passageway is formed. A fixed seat is provided in the air passageway and includes first positioning holes. A magnetically conductive first casing includes a first outer wall, a first annular lip extending radially outward from an end of the first outer wall and having second positioning holes aligned with the first positioning holes, and a first support on the other end of the first outer wall. A second casing includes a second outer wall, a second annular lip extending radially outward from an end of the second outer wall and having third positioning holes aligned with the first positioning holes, and a second support on the other end of the second outer wall. Fasteners extend through the first, second and third positioning holes. A motor is mounted in the first and second casings.

Abstract: A method of manufacturing a rotating electrical machine includes: fixing a rotor core to a shaft; assembling a stationary assembly in which a first bearing is fixed to a housing bottom portion of a substantially cylindrical housing member having a closed bottom and in which an annular stator is fixed to an inner circumferential surface of a cylinder portion of the housing member; inserting the rotor core into the stator; fitting an upper portion of the shaft into a second bearing supported by a bearing support member. The method further includes fixing the bearing support member to an upper portion of the housing member; and axially inserting a plurality of rotor magnets into a plurality of axially-extending hole-shaped or groove-shaped magnet holding portions formed in the rotor core, through a magnet insertion hole defined in one of the bearing support member and the housing bottom portion.

Abstract: A temperature protection device for a brushless DC Motor, wherein a thermal fusing type protector is provided at a depression formed on a casing of the plastic-packaged brushless DC Motor. In this way, the thermal fusing type protector can be provided conveniently at a position where the casing temperature is highest after plastic packaging, and if the protector is fused due to high temperature, it can be replaced easily.

Abstract: The invention relates to an electric motor having at least two stators disposed coaxially to each other and a rotor, wherein each stator has 2*n poles, with n=1, 2, 3, . . . , wherein each stator has at least one common coil or winding for all poles, wherein each stator has a first and second partial shell, wherein each partial shell has a shell bottom and n poles, wherein each pole is formed as a tooth extending in axial direction or substantially in axial direction and beginning on the shell bottom, wherein with assembled partial shells of a stator the tooth or the teeth of the first partial shell is or are disposed in alternating manner in circumferential direction with the tooth or the teeth of the second partial shell, and wherein with assembled partial shells or a stator, the at least one coil) or winding is received between the partial shells.

Abstract: A small DC motor includes a motor frame having a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that comprises four sides and connecting portions, each of the connecting portions connecting adjacent two of the four sides and being located inward from a corresponding corner in a quadrangle comprising the four sides; and a magnet having a circumferential surface on an inside thereof and having conformable contact with the motor frame on an outside thereof.

Abstract: An electric motor/generator cooling mechanism is presented. The cooling mechanism includes a hollow cooling jacket having an inner and outer coaxial surface, where the inner surface defines a generally cylindric cavity for receiving a stator in heat transference contact with the inner surface, and the outer surface has a cast spiral groove section with jogged cooling passages. The disclosure includes an outer case having one or more inlet ports, an outlet port, and a vent for purging air, cooling fluid flowingly encased between the cooling jacket and the outer case, flowing through the jogged cooling passages, and a flanged end surface on an end of the outer case for boltingly connecting the cooling jacket to the outer case.

Abstract: The present invention relates to a motor cover including: a first cover formed at one side with a housing coupling unit that is coupled with a motor housing; a second cover coupled to the other side of the first cover; and alignment units formed at the first and second covers to prevent a twist between the two covers by aligning an assembly position when the first cover and the second covers are assembled, and a motor including the motor cover, whereby a twist can be prevented when the motor cover is assembled and a dimensional accuracy can be enhanced.

Abstract: A new motor assembly uses a switch module to facilitate the assembly of an electric motor. The switch module can be prefabricated, and is connected to a terminal block on the motor by plug and socket connectors on the terminal block and on a terminal end of the module. The switch module is pre-wired with a power inlet and a switch, eliminating the need for a worker on the motor assembly line to make difficult electrical connections to a traditional terminal block. The switch is arranged in a switch housing that fits within an extension on the motor housing. An interior support wall on the housing fits within a channel between the switch housing and the rest of the switch module, helping to hold the assembly in position. The power inlet is positioned laterally outward from the terminal end and laterally inward of the switch.

Abstract: A motor shield covered on a motor of a drainage device over a cooling vane is disclosed to include a shield body having an arched portion and a straight portion, a guide wall disposed in the shield body and having an arched segment and a straight segment connected to the straight portion of the shield body, an airflow zone defined in the shield body in an interference relationship relative to the cooling vane and surrounded by the arched segment and straight segment of the guide wall and the arched portion and straight portion of the shield body, horizontally extending air outlets and vertically extending air outlets respectively located on the arched portion and straight portion of the shield body, and air inlets located on the periphery of the shield body. During rotation of the cooling vane, a flow of air is induced to carry heat out of the shield body through the vertically and horizontally extending air outlets efficiently.

Abstract: An electric rotating machine includes a casing having a through-hole and a drain member for draining water from the casing. The drain member has a mounting portion that includes hooks each having a proximal part and a distal part. The proximal part extends in the penetration direction of the through-hole. The distal part has a distal end that makes up an insertion end. The mounting portion is mounted to the through-hole by inserting the hooks into the through-hole from the insertion ends. The proximal parts of the hooks have flexibility so as to flex in a flexural direction perpendicular to the penetration direction during the insertion of the hooks into the through-hole. Each of the hooks also has a protrusion that protrudes from the outer surface of the proximal part toward the inner wall of the through-hole to restrict movement of the hook with respect to the through-hole.

Abstract: An electric motorcycle includes an electric motor for generating a traveling driving force, a battery for supplying electricity to the electric motor, and a case member for accommodating the electric motor and the battery therein. The battery includes a plurality of battery modules, which are disposed in the case member at positions forward of and above of the electric motor. Such arrangement of the electric motor and the battery in the case member helps to centralize mass in a vehicle body of the motorcycle, as well as simplifying assembly of the motorcycle.

Abstract: An oil-cooled motor/generator for an automotive powertrain located outside of the transmission is provided, such as a BAS motor/generator. The motor/generator may have a stator, a rotor circumscribed by the stator, and a motor shaft on which the rotor is mounted for rotation. A housing assembly may surround the stator and the rotor, with a bearing positioned between the housing assembly and the motor shaft. A flow control member may at least partially circumscribe the rotor axially adjacent the stator. A bearing retainer may be positioned axially adjacent the bearing. A rotor end ring may be axially adjacent the rotor. The housing assembly may have an inlet configured to receive cooling oil. The housing assembly, the flow control member, the bearing retainer and the rotor end ring may be configured to distribute the cooling oil from the inlet to cool the stator, the rotor and the bearing.

Abstract: A radiator for power generator coil, which is composed of a housing, a front cover, a rotating axle, a plurality of fan blades and a coil disk; wherein the coil disk is provided interiorly with a coil set, and provided at the periphery with flanges; the peripheral wall inside of the front cover is provided with grooves, thereby said flanges of the coil disk can be fastened into the front cover and disposed between the housing and the front cover; the rotating axle goes through a front rotating disk provided with a plurality of magnets, the coil disk interiorly provided with coil set, and then a rear rotating disk provided with a plurality of magnets; the rotating axle has a step, the periphery of which is provided with at least one groove, whereas the periphery of the coil disk has many openings; thus by way of the grooves and openings, the heat occurred during operation of the power generator can be guided and dispersed into air current.

Abstract: A cast end shield for an electrical machine, said end shield supporting a bearing that supports the rotor, and said end shield having an opening in the middle. In the radial direction from the centre of the shield, there is an inner rim limited by the opening, an intermediate rim connected to the inner rim and an outer rim connected to the intermediate rim. The intermediate rim has at least one substantially waved reinforcement structure, and within the reinforcement structure, the valleys of the waves are substantially in the radial direction.

Abstract: An electric motor for use in an electric vehicle, the electric motor includes: an inner housing which holds a stator; and an outer housing which defines a space through which cooling water is caused to flow between the inner housing and itself. The inner housing and the outer housing are connected by a plurality of columns disposed in the space.

Abstract: There are provided a motor capable of preventing scratches from occurring on an outer surface of a rotor case thereof, a method for manufacturing the same, and an optical disk drive using the same. The motor includes a shaft rotatably inserted into a bearing assembly; and a rotor case fixedly fastened to the shaft and rotating together with the shaft, wherein the rotor case is provided with a chamfered part along the outer peripheral edge of the bottom surface thereof. The rotor case includes a rotor hub fastened to anone end of the shaft; an extending part extending in an outer-diameter direction from the rotor hub; and a vertical extending part formed to be vertically extended downwardly in a shaft direction from anthe outer peripheral edge of the extending part and having the chamfered part formed on the bottom end surface thereof.

Abstract: A method of making a pump (10) including a polymeric pump housing (12) and a drive shaft (14) mounted for rotation in a bearing (16), the bearing (16) having on an exterior surface at least one engagement formation (44), —the method including the step of molding the pump housing (12) around the bearing (16) such that the housing (12) co-operates with the engagement formation (44) to restrict movement of the bearing (16) with respect to the housing (12).

Abstract: A generator housing includes a top portion, a plurality of side portions, and a base portion. The top, sides, and base portions are connected to form an enclosure, such that a generator can be housed inside the enclosure. The top and side portions include an air and exhaust flow structure that facilitates cooling of a generator maintained inside the housing, that provides a sound attenuation function, and that releases exhaust created by a generator. At least one of the side portions and the top portion may be opened and closed to provide access inside the housing. The base portion includes a structure that facilitates installation and transport.

Abstract: Disclosed herein is a linear vibrator. The linear vibrator includes a casing defining an internal space. A vibratory unit is accommodated in the casing to vibrate up and down. A spring is mounted at an upper circumferential end thereof to an upper surface of the casing and secured at a lower end thereof to an upper portion of the vibratory unit, thus elastically supporting the vibratory unit. An annular locking ring has a larger outer diameter than an outer diameter of the vibratory unit and an outer diameter of the spring so that the upper circumferential end of the spring is locked to the casing through press-fitting. A bracket supports the casing and the vibratory unit, with a circuit board being mounted on the bracket.

Abstract: An impeller and at least a portion of a cooperating peripheral volute may be integrated are integrally injection molded with, concentric outer rotor and inner stator assemblies, respectively, to achieve a low profile precision impeller mechanism based on an improved brushless D.C. motor with low length to diameter ratio and suitable for use in a variety of other applications. A rotating cap has an inner circumference which is molded about an outer ferromagnetic back ring that in turn supports a rotor magnet having a number of poles of alternating polarity and separated by a relatively small cylindrical air gap from a fixed stator assembly. The fixed stator assembly is integrally molded into a base housing having a bearing support that extends upwardly through the center of the stator assembly and that is rotatably coupled to a rotating shaft that extends downwardly from the center of the rotating cap.

Abstract: The production costs of electrical machines are to be reduced. To this end, it should be possible to use standard transmitters for different axis heights of the electrical machine. The invention therefore provides a transmitter cover for an electrical machine, having a pot-like hood (11) for mounting on the electrical machine and for covering a transmitter, wherein the hood (11) has a central axis. The transmitter cover also has a mounting ring (10) which engages on the hood (11) in an interlocking manner. As a result, the hood (11) is pressed against the electrical machine in the axial direction when the mounting ring (10) is fixed to the electrical machine. This can prevent fastening screws (13) colliding with other fastening screws on the motor, this possibly being the case when only the hood (11) is used to cover the transmitter.

Abstract: An electric motor has a rotor, a stator encompassing the rotor, at least one bearing bracket, and a rotor cover. The rotor cover has at least one cover cap extending from the bearing bracket to at least the front face of the stator, which faces the bearing bracket. The invention also relates to a rotor cover for an inner rotor motor, having at least one cover cap and cover fins adjoining the cover cap. The cover cap has a tapering portion from the side where the cover fins are mounted. The cover fins have a length corresponding to at least half of the length of the stator of the electric motor.

Abstract: In a motor, a motor case includes a first case and a second case separable from each other in a direction of an axis of a rotation shaft of a rotor. The first case and the second case each have cut-away portions extending parallel to the axis from a separation edge (open side edge) thereof. The separation edges of the first and second cases each have abutment portions not formed with the cut-away portions, and the abutment portions of the first case respectively abut against the abutment portions of the second case. The cut-away portions cooperatively define a plurality of windows disposed in a periphery of the motor case. The stator has a plurality of bulges projecting radially outward from a peripheral surface thereof in association with the windows.

Abstract: A motor which can be mounted in an endoscope probe without bending an electric power supply wire in an endoscope probe body, and an endoscope probe using the motor are provided. The motor includes a magnet, a field coil, a housing, an electric power supply wire, and a shaft. A lead wire from the field coil is connected to the electric power supply wire. A cutout is provided in a housing end, and the electric power supply wire is received along the cutout and led out to the outside of the motor in the direction in which a shaft projects. When the motor is mounted in the endoscope probe, the motor is placed in the endoscope probe body so that the shaft projects in the direction opposite to the direction of the front end of the endoscope probe, and the electric power supply wire, which is led out to the outside of the motor, is routed along the longitudinal direction of the endoscope probe.

Abstract: Disclosed herein is a blower motor assembly for a vehicle. The blower motor assembly comprises an armature assembly, a motor body, a magnet, an upper case, and a lower case. The armature assembly comprises a rotatable armature shaft with an armature. The motor body is an open cylinder that houses the armature assembly. The magnet is installed between the motor body and the armature assembly. The upper case has a through-hole which permits the armature shaft to projects outward through. The lower case is coupled to the upper case. The motor body is installed in an internal space defined by the coupled upper and lower cases. The motor body is fixed in a correspondingly-shaped hollow portion defined by a wall of a motor body fixing portion formed in the lower case. The magnet is fixed to a magnet fixing portion formed in the lower case.

Abstract: An electric motor assembly including a stator assembly and a rotor assembly extending through the stator assembly. A first end cap is located adjacent to a first end of the stator assembly and includes a bearing insert supporting a first end bearing for receiving an end of a rotor shaft. A second end cap is located adjacent to a second end of the stator assembly. An endbell is formed separately from the second end cap and is positioned within the second end cap. The endbell supports a bearing for a second end of the rotor shaft. An overmold material extends through the stator assembly.

Abstract: There is provided a vehicle AC generator in which the contact face of at least one of a pair of cases that make contact with the respective axis-direction end faces of a stator core is provided with a cooling air path that connects the outer circumferential surface of a coil end portion with the outer circumferential surface of the stator core and has an opening in the axis direction at the outer circumferential surface of the stator core so that the coolability of the coil end portions of the stator coil is raised, and the amount of cooling air is increased so that the overall coolability of the AC generator is improved.

Abstract: The invention relates to an electronically commutated electric machine (1), comprising a stator housing (3) which receives a stator (4) in a stator chamber (13) and which delimits a rotor chamber (14) receiving a rotor. According to the invention, the stator housing (3) comprises a main housing (31) and a cover (9), wherein an elastic sealing element (8) is arranged between the main housing (31) and cover (9) and extends into the inside of the stator housing (3) with at least one radial region (30) and forms a tolerance compensating element (19) acting on the stator (4).

Abstract: An alternator for generating electric power is mounted on an automotive vehicle. The alternator includes a housing, a stator fixed in the housing, a rotor driven by an engine of the automotive vehicle, and electric components such as a brush holder. The brush holder is mounted on a rear surface of a rear frame constituting the housing and is covered with a rear cover fixed to the rear frame. The rear cover includes a surrounding wall covering the brush device to prevent water from reaching a brush area. The surrounding wall is composed of plural partial walls having respective radiuses from a rotational axis of the rotor. The surrounding wall may be continuously made by the partial walls. Alternatively, openings for draining water may be formed in the partial walls positioned downward of the rotational axis of the rotor.

Abstract: A connector arrangement is provided for supplying electric power to a three-phase motor to produce motor operation in either a delta mode or a star mode, use being made of modular units that are removably mounted within a chamber contained in an outer frame that is secured to the motor housing. A power supply module arranged within the chamber includes a main receptacle containing a stack of terminal blocks having bus bars that transmit to the motor windings three-phase power that is supplied either by external power supply lines that extend into the chamber though openings contained in the side walls of the outer frame, or from an inverter arranged externally of the outer frame. Auxiliary receptacles are removably connected with the external surface of the main receptacle for monitoring the operating condition of the motor, or for controlling a motor operation, such as braking.

Abstract: A downhole electric motor device has a longitudinally extending tubular housing; a stator part deployed within the tubular housing; a stator coil winding looped through the stator part with an end turn having an apex; and a connecting device connecting between at least one of the coil windings and an end of the housing adjacent to an end of the stator part, thereby supporting the coil winding.

Abstract: An electric motor is described that includes a mid-shield, a chassis, and a motor control unit configured to be mounted to the chassis. The chassis includes a plurality of clinches formed proximate a first end of the chassis and configured to provide axial positioning of the mid-shield with respect to the chassis.

Abstract: A stator position adjustment method for a motor drive device that includes a motor case, a rotor shaft supported by the motor case in order to rotate a rotor inside the motor case, and a stator disposed at an outer circumference of the rotor concentrically with the rotor and having a configuration in which the stator is tightened and secured to the motor case by a tightening unit that tightens the stator along a rotor axis. The method includes the steps of setting a first tolerance range as a maximum tolerance range of a stator axis in which a first gap is formed between an outer circumference surface of the stator and an inner circumference surface of the motor case; measuring a position of the stator axis; and adjusting the position of the stator axis within the first tolerance range based on a measured position of the stator axis.

Abstract: A method for assembling an electric motor of the type having a stator unit (5) and a rotary unit (6) housed in a containment compartment (2a) delimited by a casing (2), includes exposing the compartment (2a) to a different pressure relative to the outside environment and checking for the passage of fluid between the outside environment and the compartment (2a) in order to test the motor (1) hermetic seal.

Abstract: A base for a heat-dissipating fan motor includes a plate member made of metal, a coupling barrel made of plastic, and an outer case made of plastic. The plate member is formed with at least one positioning leg and at least one air inlet hole. The plate member has a motor-confronting side, and the positioning leg extends inclinedly and protrudes from the motor-confronting side. The coupling barrel is adapted for coupling with the heat-dissipating fan motor, and has a closed-barrel end that has the positioning leg embedded therein, and an open-barrel end opposite to the closed barrel end. The outer case is connected to the plate member, cooperates with the coupling barrel to form a motor-receiving space, and is formed with an air outlet hole.

Abstract: Provided is an automotive alternator having structure for preventing entry and discharging of foreign matters irrespective of a posture of a brush unit, to thereby allow normalization of the brush unit. The brush unit of the automotive alternator includes a slip ring, a brush, a brush holder, and a slip ring cover coaxially spaced from the slip ring and having an inner peripheral surface surrounding substantially an entire periphery of the slip ring. The inner peripheral surface of the slip ring cover has a tapered surface increasing in diameter from a first end on the frame side toward a second end having a fully-open opening. The fully-open opening is sealed by a sealing member that forms a labyrinth seal with the second end.

Abstract: The invention relates to an electrical machine, particularly an alternating current generator, that can be designed as a three-phase alternator, for example, having—preferably electrical—components that are protected from access, wherein to this end there is a protective cap (47) fastened by means of at least one snap region (103), wherein the snap region (103) has a snap-in hook (92) having a snap-in hook root (106), wherein there is a bending region (109) between the snap-in hook (92) and the snap-in hook root (106), wherein the bending region (109) has a cambered surface (112, 115).