DE102019220328A1 - mowing machine - Google Patents

Abstract

The invention is based on a lawnmower (11), in particular an autonomous lawnmower (11), having at least one chassis (45), a motor (15) accommodated in a motor housing (36), and a cutting device (15) that can be driven by the motor (15). 200), further comprising a height adjustment device (16) for displacing the cutting device (200), the motor housing (36) and the motor (15) relative to the chassis (45), at least for setting a working height (h) of the cutting device (200) ), in particular for setting a cutting height (s) of a cutting tool (18) of the cutting device (200), the motor housing (36) having a cover (52) and at least one base body (50), in particular a base body (50) designed as a housing pot It is proposed that the cover (52) is provided to fix the motor (15) on the motor receiving housing (36).

Description

State of the art

Lawn mowers according to the preamble of claim 1 are already known. Such lawnmowers typically have a base body which is designed as a housing pot, to the base of which a motor for driving a cutting device is fastened. A drive shaft of the motor protrudes through the base of the base body to drive a cutting device. A cover is provided for closing the base body and is arranged opposite the base. The base body and cover form a motor housing.

Disclosure of the invention

The invention is based on a lawnmower, in particular an autonomous lawnmower, comprising at least one chassis, a motor accommodated by a motor housing, and a cutting device that can be driven by the motor, further comprising a height adjustment device for moving the cutting device, the motor housing and the motor relative to the chassis , at least for setting a working height of the cutting device, in particular for setting a cutting height of a cutting tool of the cutting device relative to the chassis, the motor housing having a cover and at least one base body, in particular a base body designed as a housing pot.

It is proposed that the cover be provided to fix the motor. The cover fixes the motor on the motor housing. This can improve maintenance accessibility to the engine. The component accommodating the motor - here the cover - typically has a smaller volume, in particular it encloses a smaller volume. The production of a cover can therefore be more favorable and / or the amount of material required for the cover can be lower, in particular than for a base body that accommodates the motor. Furthermore, properties relating to heat transport through the cover and / or heat transport avoidance through the base body can be provided in a simple manner. The cover can be designed in a strength-optimized manner for receiving and / or fixing and / or heat-conducting connection of the motor.

A “lawn mower” is to be understood as a work device for performing work, in particular work in the garden. A lawnmower can also be understood to mean another device that is set up to shorten or prune a lawn, for example a scarifier or the like. A lawnmower can be designed, for example, as a push lawnmower with or without a drive system or as an autonomous lawnmower. For this purpose, the lawnmower typically has wheels which support the chassis from the ground and enable the lawnmower to move over a work surface, in particular with little resistance.

An “autonomous lawnmower” is to be understood here in particular as a device that moves, orients and / or navigates automatically in an area and / or in an environment, in particular after a learning process. The expression “automatically move and / or orient” is intended here to define, in particular, movement, orientation and / or navigation of the device, in particular after a learning process, without human intervention. The autonomous lawnmower is preferably provided to drive over and / or work on a work surface configured as a lawn area and / or a work environment configured as a garden environment.

A “chassis” should in particular be understood to mean a running gear with wheels mounted on it. These can only be provided for rolling and / or partially or completely driven. The chassis can, however, also represent the suspension and / or a frame for other means of locomotion or support that are received thereon, for example articulated arms for a type of locomotion based on walking, one or more rotors for a flying type of locomotion or the like. The chassis can serve as a frame for suspending and / or fixing the means of locomotion and / or other components of the implement, such as for an energy supply, a control or regulation system, a body, for work and locomotion drives and / or the like. In particular, driven wheels for supporting the chassis from the ground are accommodated on the chassis wheels. The chassis of the lawnmower is designed to accommodate the height adjustment device, the motor and the motor housing. At least part of the height adjustment device is firmly connected to the chassis.

A “height adjustment device” can also be understood to mean a height adjustment unit. It is intended to adjust a working height of the lawn mower. It is preferably provided for setting a working height, in particular a cutting height, of the cutting device or a tool received by a tool holder relative to a substrate. A setting can be made manually by an operator, automatically, or manually and implemented mechanically, for example by means of a height adjustment motor. Is preferred Height adjustment device is provided for a tool-free setting of a working height, in particular a cutting height, of a tool received by the tool holder relative to a substrate and / or relative to the chassis. The height adjustment device is set up to move the cutting device together with the motor mounting housing relative to the chassis. The working height is preferably defined by a plane which runs parallel to a subsurface and / or a standing plane of the autonomous working device and in which a lowest point of a tool lies. “Provided” is to be understood in particular as specifically designed and / or equipped. The fact that an object is provided for a specific function is to be understood in particular to mean that the object fulfills and / or executes this specific function in at least one application and / or operating state. The drive unit and / or the motor mounting housing accommodating the drive unit can advantageously be adjusted in height by means of the height adjustment unit. A safety guard, in particular for catching parts of the cutting device that loosens, can also be provided on the motor mounting housing in particular.

It is proposed that the cover be arranged between the cutting device and the motor housing of the motor. The cover is provided for receiving and / or fixing a drive shaft side of a motor housing of the motor. The cover forms, so to speak, the motor flange for receiving and / or fixing the motor. The engine has a motor housing. The motor housing encloses a stator and rotor of the motor. The motor housing has bearings for supporting a drive shaft. The drive shaft is provided for driving, in particular for driving the cutting device directly. The drive shaft protrudes through an opening in the cover or in the motor flange. The drive shaft drives a tool holder or a tool arranged on the tool holder. The tool holder and the tool can form at least parts of the cutting device. The cutting device can be designed, for example, as a cutter bar, as a turntable with at least one knife, as a turntable with at least one knife that can be rotated relative to the turntable and / or the like.

The base body encloses the motor radially with respect to its axis of rotation. The base body encloses the motor axially on one side with respect to its axis of rotation, in particular facing away from the drive shaft side. The base body encloses the motor axially on the side opposite the cover with respect to its axis of rotation. The base body is designed at a distance from the motor housing. An inner contour of the base body is designed at a distance from the outer contour of the motor, in particular at a distance from the motor housing of the motor.

The cover closes the base body, in particular the base body designed as a housing pot. A seal is advantageously arranged between the cover and the base body. The seal can in particular be designed as a static seal, for example by means of a sealing ring or the like. In addition to a wall which axially closes the motor, in particular a wall which closes the motor receiving housing, the cover can also have radial walls. Their axial extent is at least smaller than the axial extent of the radial wall of the base body, in particular of the housing pot. The radial wall can have an essentially cylindrical, square, rectangular shape and / or a mixed shape thereof and / or any other contour that radially surrounds the motor, for example freeform. The radial wall can also be constructed from several wall sections. The radial and axial walls of the base body are advantageously designed in one piece. The base body advantageously has plastic. In particular, the base body is made of plastic. In particular, the base body is formed from a thermally insulating material. The base body can also have an axial wall detachable from the radial wall. These radial and axial walls are advantageously materially connected.

It is proposed that the cover and the base body are formed from different heat-conducting materials, in particular wherein the cover is made from a material with increased thermal conductivity, preferably a thermal conductivity that is many times higher than the thermal conductivity of the base body, in particular the base body from a heat insulating material, in particular heat insulating plastic is formed.

It is proposed that the cover is intended to dissipate heat in the direction of a standing plane of the lawnmower and / or in the direction of the area of the cutting device, in particular in the direction of an air flow caused by the cutting device, in particular in the direction of an air flow caused by a tool and / or a tool holder the cutting device caused air flow.

The cover can be constructed, for example, from a plastic with increased thermal conductivity, a composite material, a metal, in particular at least aluminum-containing metal or the like. The thermal conductivity of the cover or motor flange is preferred in the area of that of aluminum alloys. A heat flow in the The motor housing can thus be steered. Part of the motor housing, in particular the cover or motor flange, can thus serve at least as part of a cooling system. The cover dissipates heat in the direction of the standing plane or in the direction of the tool holder, in particular in the direction of an air flow caused by the tool or the tool holder. The cover is advantageously in direct contact with air or an air stream on an underside of the working device. The air flow is advantageously caused by the work device, in particular a tool holder and / or the tool. The base body or the housing pot is advantageously formed from an at least thermally conductive insulating material, for example plastic, in particular a thermally insulating material and / or plastic. Because the motor housing or the base body and cover have (s) different materials, on the one hand an insulating effect, in particular in the area surrounding the base body, and on the other hand heat conduction, in particular through the cover to the environment, can be provided. The cover or motor flange, which is in particular in contact with the air flow caused by the tool holder and / or the tool, dissipates heat. The base body or the rest of the motor receiving housing or the housing pot, which is typically arranged in the interior of the housing of the working device, is and / or has an at least insulating effect. Only the cover or motor flange made of the material with improved thermal conductivity is advantageous. Targeted heat dissipation can be achieved, in particular in an area where optimal heat dissipation can be expected, in particular through the tool or the tool holder (high air circulation, shaded side of the implement, close to the ground and / or in the area of the moist and / or cool Grass etc.). In addition, heat dissipation through the rest of the motor housing or the base body can at least be reduced. As a result, little heat is given off into the interior of the housing, in particular between the upper and lower housing shells. To a certain extent, insulation is achieved by the base body. A thermal bridge is provided by the cover or motor flange. This avoids overheating of the further electrical or electronic components, for example the computing unit, the accumulator or the like, which are arranged in particular within the housing. Effective heat dissipation from the motor housing, in particular heat caused by the drive unit, is made possible.

It is proposed that the base body have a ventilation opening and / or an opening for receiving a ventilation device, in particular this being arranged on the side of the base body facing away from the cover.

It is proposed that a support unit is provided at least to support the motor receiving housing receiving the motor, in particular wherein between the support unit and the motor, preferably between the support unit and the motor receiving housing receiving the motor, at least one, preferably several, elastic support and Support element (s) is / are arranged, preferably to support and carry the drive unit relative to the support unit so as to decouple vibrations.

A “support unit” should preferably be understood to mean a unit which is provided to support forces, in particular to support forces of the drive unit and / or the tool holder and / or the tool. This is to be understood in particular as carrying and / or holding forces, for example due to the weight force and / or operating forces of the drive unit and / or tool holder and / or the tool. In regular operation, these can be, for example, acceleration and braking forces of the drive unit, but in particular oscillations or vibrations and / or the like, in particular those of the drive unit and / or the tool holder and / or the tool. It can be forces that are caused, for example, by an imbalance in the tool holder, in particular a tool holder designed as a turntable and / or by the tool or tools fixed to the tool holder, and / or the like. An imbalance can be caused, for example, by manufacturing tolerances of the tools, can occasionally arise in particular on the tool holder due to a heavily worn and / or fallen tool, in particular a plurality of tools, preferably a plurality of tools and / or the like provided on the tool holder. Furthermore, pressure, impact and / or impact forces which act in particular on the tool holder and / or the tool can be supported by the support unit, for example when cutting or incising a hard object. Other forces that act axially, radially and / or in the circumferential direction at least indirectly on the tool holder can also be supported by the support unit. The support unit preferably supports these forces at least indirectly on the chassis. The support unit is preferably designed to be height-adjustable. It is preferably linearly guided via a guide device. The guide device can at least to prevent rotation of the support unit, in particular to prevent rotation of the motor receiving housing connected to the support unit and / or Motor housing of the motor may be provided. The guide device can be provided to avoid play between the support unit and the guide device. The guide device can, for example, guide a sliding seat of the height adjustment unit, in particular a sliding seat formed by the support unit, in particular guide it at least in a rotationally inhibited manner. The guide device advantageously has guide means which are designed to be circumferentially elastic, in particular rotationally inhibiting. They are provided for anti-rotation and axial guidance of at least the motor housing, in particular the motor housing, preferably the sliding seat relative to the chassis around or in the direction of the vertical adjustment axis. They are advantageously designed to be elastically displaceable in the circumferential direction about the height adjustment axis. The sliding seat is linearly displaceable when a rotating body is rotated for height adjustment. The rotating body and the sliding seat advantageously have corresponding threads for this purpose. The sliding seat or the support unit or support device could in principle also be designed to be displaceable differently, for example by a device according to FIG EP3167703 5 , especially reference numerals 30th , 68 , 70 , 28 , 64 , 66 .

An elastic carrying and supporting element is to be understood in particular as a damping element. This can for example be formed from an elastomer, a spring, a foam or the like. The elastic carrying and supporting element is intended to dampen vibrations and oscillations. Furthermore, it carries and supports the drive unit, or the motor mounting housing accommodating the drive unit. “Vibration-decoupling” is to be understood as meaning, in particular, that kinetic energy is converted into heat in the elastic carrying and support element and passed on at least in a damped manner to the support unit or the chassis. In particular, this kinetic energy is absorbed by internal friction in the carrying and supporting element. In particular, a movement and / or vibration of the drive unit and / or the tool holder is at least partially decoupled from a movement and / or vibration of the support unit and / or the chassis.

It is proposed that the support unit is designed to be adjustable in height relative to the chassis, in particular adjustable in height relative to the chassis in a linearly displaceable manner, in particular adjustable in height together with the cutting device, the motor and / or the motor mounting housing.

It is proposed that between the chassis and a support unit for holding and supporting the motor and / or for holding and supporting a motor receiving housing accommodating the motor, guide means for the rotation-inhibiting and axial guidance of the support unit relative to the chassis around or in the vertical adjustment axis are provided, with that or the guide means are designed to be elastically displaceable in the circumferential direction around the height adjustment axis, preferably wherein the guide means are part of a guide device and / or at least one guide element.

It is proposed that the lawnmower comprises a guide device which is formed separately from the chassis and has at least one guide element which, based on a height adjustment axis of the height adjustment device, is designed for at least rotationally inhibiting axial guidance of a support unit or a sliding seat and for at least axially inhibiting rotational guidance of a rotary body of the height adjustment device.

The implement can advantageously be operated more quietly. A noise emission of the working device can thereby be reduced considerably, in particular by several decibels, preferably by> 5db, particularly preferably by> 10db, in particular in contrast to working devices, preferably autonomous lawnmowers, according to the prior art. Unpleasant rattling and / or hitting and / or rattling can be avoided. Such noises can be caused, for example, because the tool holder, in particular the turntable and / or the tool, have an imbalance. Sometimes an imbalance occurs in the tools due to their wear and tear. One of the several tools fastened to the tool holder or the turntable, for example, can suffer wear or breakage and / or be blocked from rotating or locked in a non-rotatable manner and / or lost. The tool holder or the tool can in particular have been damaged by their operation or other things causing an imbalance have occurred. In the delivery state, the working device, in particular the tool holder and / or the tool and / or the cutting device, is typically balanced. In this respect, noise emissions can be optimized over the life and / of the service life of the working device. The tool holder of an autonomous lawnmower can be designed as a turntable with a diameter of 150 to 300 mm, for example. It can rotate with revolutions from 2000 to 4000 revolutions per minute. Several tools, in particular knives, which are preferably rotatable relative to the turntable, can be arranged on their outer circumference. Damage, uneven wear, accumulation of dirt and / or grass, in particular on the tool and / or the tool holder and / or in between, through restriction of movement of the knife, in particular caused by accumulation of dirt and / or grass and / or the like, can cause a Imbalance arise and / or occur. A center of gravity of the cutting device or the tool holder together with the tool is shifted eccentrically with respect to the axis of rotation of the drive unit and / or the tool holder. During operation of the working device, this imbalance can in particular cause periodic displacement of the tool holder and the drive unit connected to it and / or of the motor holder housing which, in particular, holds the motor in a firmly connected manner. As a result of the design, these shifts in the transmission path to the chassis can at least be dampened. Particularly hard contact and / or direct force transmission and / or direct contact of the drive unit, in particular the motor housing housing the drive unit and the support unit and / or the chassis connected to the support unit, is avoided. A vibration decoupling effect is achieved. Hard contact between mechanically force-transmitting components is avoided. In this way, in particular, rattling, hitting and / or other noise emissions can be avoided. Thus, an implement, in particular an autonomous lawnmower, can be operated more quietly and / or in a manner that reduces damage to implement components. This can increase the user-friendliness. Night-time or rest-time operation of the work device can at least be improved or made possible. The acceptance of autonomous lawnmowers in particular can be increased. In particular, a direct transmission of structure-borne noise between the cutting device and / or drive unit and / or the motor mounting housing accommodating the drive unit to the support unit and / or the chassis can be avoided or at least attenuated.

Figure list

Further advantages emerge from the following description of the drawings. In the drawing, an embodiment of at least the invention is shown in several figures. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

• 1 ein Arbeitsgerät in Form eines autonomen Arbeitsgeräts, insbesondere eines autonomen Rasenmähers,
• 2 das Arbeitsgerät in einer schematischen Schnittdarstellung,
• 3 einen Teilausschnitt des Arbeitsgeräts in einer schematischen Explosionsdarstellung ohne Chassis oder Gehäuse,
• 4 ein Schnitt durch den Teilausschnitt in einer Schnittebene C-C gemäß 9,
• 5 ein Schnitt durch den Teilausschnitt in einer Schnittebene D-D gemäß 6,
• 6 eine Seitenansicht auf den Teilausschnitt und eine Schnittdarstellung durch die Schnittebene A-A,
• 7 eine Frontansicht auf den Teilausschnitt und eine Schnittdarstellung durch die Schnittebene B-B in einer ersten Konfiguration bzw. Arbeitshöheneinstellung,
• 8 eine Frontansicht auf den Teilausschnitt und eine Schnittdarstellung durch die Schnittebene B-B in einer zweiten Konfiguration bzw. Arbeitshöheneinstell ung,
• 9 eine Draufsicht auf den Teilausschnitt und einen Verweis auf die Schnittebene C-C nach 4,
• 10 eine perspektivische Einzeldarstellung einer Abstützeinheit bzw. eines Schiebesitzes,
• 11 eine Front- und Rückansicht der Abstützeinheit bzw. des Schiebesitzes nach 10,
• 12 eine perspektivische Einzeldarstellung einer Führungsvorrichtung.

Show it:

• 1 a work device in the form of an autonomous work device, in particular an autonomous lawnmower,
• 2 the working device in a schematic sectional view,
• 3 a partial section of the equipment in a schematic exploded view without chassis or housing,
• 4th a section through the partial section in a section plane CC according to FIG 9 ,
• 5 a section through the partial section in a section plane DD according to FIG 6th ,
• 6th a side view of the partial section and a sectional view through the section plane AA,
• 7th a front view of the partial detail and a sectional view through the cutting plane BB in a first configuration or working height setting,
• 8th a front view of the partial section and a sectional view through the cutting plane BB in a second configuration or working height adjustment,
• 9 a plan view of the partial section and a reference to the cutting plane CC according to 4th ,
• 10 a perspective individual representation of a support unit or a sliding seat,
• 11 a front and rear view of the support unit or the sliding seat according to 10 ,
• 12th a perspective individual representation of a guide device.

1 shows an implement 10 in a perspective schematic representation. It is as an autonomous working device 10 educated. It's called a lawn mower 11 educated. It's as an autonomous lawn mower 11 educated. The working device 10 is intended for processing a lawn. The working device 10 is intended to mow a lawn. Alternatively, the or an alternatively constructed working device could, for example, be provided for scarifying, trimming or the like or designed as such. It could also be designed as a push lawn mower, which is at least manually guided over a work surface, in particular can be pushed at least manually over a work surface. However, it could also be an airworthy or runnable working device (not shown here) on a chassis 45 fixed rotors, articulated arms, other means of locomotion or the like. In principle, it could also be used as a cleaning device with a tool designed as a cleaning tool, which on the tool holder, in particular with its drive unit, is height-adjustable relative to the chassis 45 is received, be formed. According to the embodiment of 1 is the working device 10 intended for autonomous locomotion. The working device 10 has two separately driven rear wheels for autonomous locomotion 38 as well as two freely rotating front wheels 40 on, where in 1 and in the sectional view according to 2 only one rear and one front wheel can be seen is. The basic structure of an autonomous lawnmower should be sufficiently known to the person skilled in the art, which is why details on the wheel drive, the control or regulation, the navigation and / or communication means will not be discussed in greater detail here. In principle, the working device can also have other means of locomotion, for example the aforementioned articulated arms which are attached to a chassis, for example to enable a type of locomotion based on a biped or quadruped. Alternatively, the working device could also be designed to be floating, for example as a drone.

The rear wheels 38 are individually driven by drive units that are not visible any further. They can be controlled individually. This makes the implement maneuverable. The front wheels 40 can be freely rotated horizontally to change an orientation. The movement of the autonomous working device 10 can be from a control or regulation unit 13th controlled or regulated.

2 shows a schematic section longitudinally through the implement 10 or the autonomous lawnmower 11 to 1 or a cut through a comparable tool. The autonomous working device 10 has a housing 34 on. The case 34 is in particular formed by a plastic housing, but can also be at least partially formed from a different material. The case 34 has an upper housing shell 42 and a lower housing shell 44 on. The upper housing shell 42 is with the lower housing shell 44 connected. The lower housing shell 44 forms the chassis 45 of the implement 10 . On the chassis 45 here are the rear and front wheels 38 , 40 recorded. The implement also has 10 a tool holder 12th on. The tool holder 12th is used to hold a tool 18th . The tool 18th is attached to the tool holder 12th attached. The tool holder 12th has a drivable turntable 46 on. The tool 18th will be at the turntable 46 the tool holder 12th attached. The tool 18th form several knives. Three knives are provided here (only two of which are visible), which are attached to the tool holder at regular intervals or angles (every 120 °) 12th are rotatably attached. The tool 18th forms a cutting tool. The tool holder 12th and the tool 18th form at least parts of a cutting device 200 . Of course, a different number of knives or a different configuration of the cutting device is also possible 200 imaginable, for example as a knife bar or the like. Furthermore, the implement 10 a drive unit 14th on. The drive unit 14th is by an engine 15th formed or at least includes this. The motor 15th is designed as an electric motor. The drive unit 14th is a drive for the tool holder 12th or the cutting device 200 intended. The drive unit 14th is a drive of the tool 18th intended. The drive unit 14th has a drive shaft 48 on which one with the turntable 46 the tool holder 12th is rotatably connected. In principle, it could be between the turntable 46 and the drive unit 14th a translation can also be provided, for example by means of a gear, for example in the form of a belt with pulleys of different diameters or the like. A pulley could be on the drive shaft 48 , the other drive pulley can be provided on a separate drive shaft, not shown here, for a tool holder and / or a tool. About the drive shaft 48 and the turntable 46 the tool holder 12th becomes the tool 18th driven. One axis 58 of the engine 15th , or the drive unit 14th or the drive shaft 48 is opposite a vertical - here the axis 59 inclined. The axis 59 is essentially perpendicular to a standing plane 56 of the autonomous working device 10 educated. The axis 59 also forms the height adjustment axis 590 the height adjustment device or the height adjustment unit 16 . The axis 58 the drive unit 14th is perpendicular to a standing plane with respect to a normal 56 or opposite the axis 59 of the autonomous working device 10 typically inclined by 0-10 °, preferably by 3 °. The axis 58 the drive unit 14th forms an axis of rotation of the tool holder 12th . Due to the inclination of the axis 58 can be a drag on the tool 18th while it passed over the grass can be reduced in a known manner. It can be used during operation, in particular during a forward movement of the implement 10 advantageously primarily with a leading edge of the tool 18th get cut.

A motor housing 36 is to accommodate the drive unit 14th or the engine 15th intended. In principle, the motor housing 36 be designed only as a flange receptacle and not be further sealed. The motor 15th would then be simple by means of its motor housing 33 fixed to the flange plate. This is where the drive unit becomes 14th or the engine 15th but advantageous from the motor housing 36 at least partially, in particular completely enclosed, in particular at least partially enclosed in a sealing manner. The motor housing 36 can have a particularly pot-shaped base body 50 and a lid 52 exhibit. The lid 52 is advantageously closer to the stand level 56 arranged as the base body 50 . The lid 52 is adjacent to the tool holder 12th and / or between the engine 15th and the tool holder 12th arranged. The lid 52 is between the cutter 200 and the motor housing 33 of the motor 15th arranged. The lid 52 is adjacent to the stand level 56 , the basic body 50 facing away from or above it. The lid 52 forms a receiving area for receiving the drive unit 14th . It serves as a motor flange, so to speak 35 for the engine 15th . The motor housing 36 is from the lid 52 to one side, especially to the stand level 56 closed. The lid 52 is with the main body 50 connected - screwed here. There is also a sealing element 51 or sealant between the lid 52 and the main body 50 provided, in particular a compression seal or another sealant or the like. The drive unit 14th is tight to the lid 52 or connected to the motor flange. A direct heat conduction from the motor housing 33 on the lid 52 or motor flange 35 is advantageously made possible. There is also a sealing element 53 or sealant between the lid 52 and the drive unit 14th or the engine 15th intended. By the sealing element or elements 51 , 53 moisture can penetrate into the motor housing 36 can be avoided, which serves at least to prevent corrosion, in particular to prevent corrosion of engine components. In one of the lid 52 facing away from the base of the body 50 (here at the top), the basic body 50 a receptacle or an opening for a vent 39 or a vent. The air vent 39 can in particular for air-permeable but at least water-repellent sealing of the motor housing 36 serve. The motor housing 36 can serve to accommodate a cooling system and / or form parts thereof. For example, through the choice of material for the cover 52 and base body 50 as explained below, a heat flow can be directed and a cooling system can be provided. The motor housing 36 has in particular in an upper region of the base body 50 a partly frustoconical basic shape. It is of a cylindrical rotating body 118 surround. In the lid 52 a recess is provided through which the drive shaft 48 from the lid 52 , or the motor flange 35 , or the motor housing 36 is led. In an area of the recess in the cover 52 can be a warehouse 268 for bearing the drive shaft 48 be arranged. A radial seal can also be used 270 be provided, in particular to prevent moisture from penetrating from outside the motor mounting housing 36 at least to complicate at least by the area of the recess. On one of the main bodies 50 remote side of the lid 52 or the motor housing 36 is the tool holder 12th arranged and with the drive shaft 48 connected. The lid 52 or motor flange 35 can be made of a material other than the base body, particularly in terms of thermal conductivity 50 or the housing pot of the motor housing 36 be educated. The motor flange is advantageous 35 made of a material with higher thermal conductivity than the material of the base body 50 formed, for example an increased thermally conductive plastic, composite material, metal, in particular aluminum-containing metal and / or the like. Heat in the motor housing 36 and / or the implement 10 , in particular caused by the engine 15th , can thus be steered. Part of the motor housing 36 , especially the lid 52 or motor flange 35 can thus form at least part of a cooling system. The cover advantageously leads 52 Warmth in the direction of the standing level 56 or in the direction of the tool holder 12th particularly in the direction of an operation of the tool 18th or the tool holder 12th caused air flow. This serves as a kind of cooling air flow for the engine. The lid 52 is in direct contact with air or the air flow on an underside of the working device 10 . The basic body 50 or the housing pot is advantageously formed from an at least thermally conductive insulating material, for example plastic. In that the motor housing 36 or the base body 50 and lid 52 has (s) different materials, an insulating effect on the one hand and a heat dissipation effect on the other hand can be provided. The lid 52 or motor flange, in particular in contact with the through the tool holder 12th and / or the tool 18th caused air flow, dissipates heat. The basic body 50 or the rest of the motor housing 36 that's inside the case 34 is arranged, is and / or has at least an insulating effect. Only the cover can be advantageous 52 or motor flange 35 made of the improved thermally conductive material. In particular, it can be formed from a more stable material than the base body 50 , especially about the engine 15th and / or a safety catch 212 or the like to be able to record safely, in particular non-rotatably. This can save costs, since not the entire motor housing 36 or the base body 50 is designed from thermally conductive and / or more stable material. Targeted heat dissipation is made possible, in particular in an area where, in particular, through the tool 18th , or the tool holder 12th optimal heat dissipation can be expected (high air circulation, shaded side of the implement, close to the ground and / or in the area of the damp and / or cool grass, etc.). In addition, heat can be emitted through the rest of the motor housing 36 or the base body 50 at least be reduced. This means that there is at least little heat from the engine 15th inside the case 34 , in particular between the upper and lower housing shell 42 , 44 submitted. In a sense, is made by the base body 50 of the motor housing 36 achieved isolation. Through the lid 52 or motor flange 35 a thermal bridge is provided. In particular, this can result in overheating of further electrical or electronic components, for example the control and regulation unit 13th and / or an accumulator 17th to Power supply of the lawn mower 11 or the like, can be avoided. Effective heat dissipation from the motor housing 36 in particular by the drive unit 14th generated heat is made possible. A high efficiency of the engine 15th effective cooling can be obtained.

Furthermore, the autonomous working device 10 a height adjustment unit or height adjustment device 16 on. The height adjustment unit 16 is at least for setting a working height h or cutting height s of the cutting device 200 or that of the tool holder 12th added tool 18th intended. It is also used to adjust the height of the drive unit 14th or motor 15th , especially of the drive unit 14th receiving motor housing 36 intended. It includes a rotating body 118 and a sliding seat 204 that are threadedly connected to each other (see description later). The rotating body 118 and the sliding seat 204 are from a guiding device 19th out, in particular comprising the rotating body 118 axial locking and the sliding seat 204 anti-rotation guide elements 19th . The sliding seat 204 forms a support unit 100 or support device for supporting the drive unit 14th or the motor housing 36 out. He is about support and support elements 102 with the motor housing 36 connected. The support unit 100 could in principle also directly with the engine 15th or the motor housing 36 be connected. The height adjustment device 16 could also be configured differently with regard to the height adjustment mechanism (in particular without rotating body), for example according to the figures, in particular 2-5 the EP3167703 . However, it would also be advantageous to provide a support unit and / or guide unit and one / more carrying and support elements in order to decouple the drive unit or the motor mounting housing and / or the tool mounting from the support unit or the chassis.

The height adjustment device 16 is on a recording 103 of the chassis 45 recorded (see below). On the motor housing 36 a protective device is fixed, in particular a safety catch 212 for catching loosening parts of and / or components fixed to the tool holder and / or of cut material or the like. This is together with the motor housing 36 designed to be adjustable in height. A working height h of the tool 18th is the working height relative to the chassis 45 or a permanently connected component of the height adjustment device 16 Are defined. A cutting height s of the implement 10 or the tool 18th is relative to the standing level 56 Are defined. Via the height adjustment unit 16 an operator can set a working height h that he desires. Alternatively, the working height h could also be adjusted automatically, for example by a motorized device. The height adjustment unit 16 is a tool-free setting of the working height h or cutting height of the tool 18th relative to the chassis 45 or relative to the subsurface or the stand level 56 intended. The cutting height s is preferably parallel to the standing plane due to the distance 56 of the autonomous working device 10 running plane defines in which a deepest point of the tool 18th lies. The working height h can be adjusted in stages, but could in principle also be adjusted continuously. The 7th and 8th show different working or cutting heights h, s of the implement 10 or lawn mower 11 , or different states of the height adjustment unit 16 . The cutting height s in 7th is set to the maximum, i.e. the distance from the standing level 56 to the tool 18th is maximum. In 8th For example, the cutting height s is set to a minimum, i.e. the distance from the standing plane 56 to the tool 18th is minimal. For the working height h or the distances from the chassis 45 the reverse is true.

The height adjustment unit 16 comprises several components. In the exemplary embodiment shown, the height adjustment unit comprises 16 at least one actuator 22nd , a rotating body 118 and a sliding seat 204 . A guiding device 19th led the rotating body and the sliding seat 204 relative to the chassis 45 . The actuator 22nd is provided for this purpose in one actuation direction 24 to be moved. The actuator 22nd is provided around the height adjustment axis 590 to be rotated. The actuator 22nd is with the rotating body 118 connected. The actuator 22nd is via a spline 202 with the rotating body 118 torsionally rigidly connected. It could also be a translation between the rotating body 118 and the actuator 22nd be provided, in particular with an alternative actuating element eccentric to the height adjustment axis 590 could be arranged. The rotating body 118 is as a hollow cylindrical rotating body 118 educated. The rotating body 118 is from a sliding seat 204 at least partially surrounded radially. The rotating body 118 and the sliding seat 204 have corresponding threads 206 , 208 on, so that by rotating the rotating body 118 a linear displacement of the sliding seat 204 he follows. The rotating body 118 has an external thread, the sliding fit 204 a corresponding internal thread. The motor housing 36 is inside the hollow cylindrical rotating body 118 relocatable. The sliding seat 204 is as a support unit 100 for the motor housing 36 educated. The sliding seat 204 can be moved axially or linearly along the axis 59 educated. He's by the guiding device 19th anti-rotation in the chassis 45 recorded, in particular locked against rotation about the axis 59 . The guiding device 19th is solid to the chassis 45 connected. The Guide device 19th is at the recording 103 or a guide receiving chamber 62 of the chassis 45 fixed.

The rotating body 118 and the sliding seat 204 or the support unit 100 have corresponding threads 206 , 208 or threaded sections 122 , 124 on. There are multiple threads 206 , 208 intended. In the present embodiment, the thread 206 , 208 four gears. A stroke of the sliding seat can thus be advantageous 204 can be quadrupled per turn compared to a single start thread. In particular, by means of one rotation of the actuating element 22nd or the rotating body 118 the working height h between a maximum value (cf. 8th ) and a minimum value (cf. 7th ) can be adjusted. Consequently, with a relatively small rotary actuation of the actuating element 22nd , or a rotation of the rotating body 118 , a relatively large stroke of the support unit 100 or the sliding seat 204 be achieved. With one turn of the rotating body 118 the working height h between the maximum value and the minimum value can advantageously be adjusted by less than 360 °. In the present case, this corresponds to a cutting height s between 20 and 60 mm. The cutting height s can be indicated by a display means 214 (see. 9 ) can be indexed to a user. In the rotating body 118 or a ring section 116 of the rotating body 118 Corresponding figures are attached, which can be read through a viewing window (not shown here). The threads 206 , 208 or threaded sections 122 , 124 are designed like a trapezoidal thread. The threads 206 , 208 or the threaded sections 122 , 124 are at least partially self-locking. Unintentional lowering of the support unit 100 inside the chassis 45 can thereby at least partially be avoided.

The rotating body 118 is axial in the direction of the axis 59 held axially displacement inhibited. He's by the guiding device 19th or the guide elements 20th rotatable in the circumferential direction and axially blocked. The support unit 100 is locked against rotation but can be moved lengthways. She is through the guiding device 19th or the guide elements 20th axially displaceable and guided and / or received in a rotationally inhibited manner in the circumferential direction. One rotation of the rotating body 118 causes a linear displacement of the support unit 100 , in particular lowering or raising the support unit 100 . With the support unit 100 the motor housing connected to it also rises and falls 36 , or the drive unit 36 and cutting device 200 . The guiding device 19th decouples the height adjustment device, in particular due to its specific design 16 , but in particular the support unit and / or the drive unit connected to it 14th and cutting device 200 at least in part, from the chassis 45 . The height adjustment unit 16 is in a recording 103 of the chassis 45 recorded. The recording 103 is here in one piece with the chassis 45 educated. The recording 103 forms a guide receiving chamber 62 from or surrounds them. The lead receiving chamber 62 extends from an underside of the implement 10 toward a top of the implement 10 . The lead receiving chamber 62 extends normal or perpendicular to the standing plane 56 of the implement 10 . It extends along the axis 59 . The lead receiving chamber 62 is at least to the bottom of the chassis 45 open to. The lead receiving chamber 62 is at least to accommodate the guide device 19th intended. The guiding device 19th has guide elements 20th or records them. There are two guiding elements 20th provided, which are arranged opposite one another. In relation to the axis 59 are they positioned opposite each other. They extend in the direction of the axis 59 . They also surround the drive unit 14th , the motor housing 36 , the rotating body 118 and / or the sliding seat 204 radially, in particular in an angular range of greater than 45 °, here between 45 ° and 180 °. The two guide elements 20th are intended to be fixed to the guide receiving chamber 62 to be included. In the lower, the standing level 56 close area by means of form-fit elements 218 , in the upper area by means of screw connections of which only the screw holes here 220 you can see. Other forms of connection are also possible. The guiding elements 20th wise guide means 600 in particular guide profiles 60 on. These are used for linear guidance or, in particular, for the rotation-inhibiting axial guidance of the sliding seat 204 or the support unit 100 . The linear guidance takes place in the direction of the axis 59 . Furthermore, the guide profiles prevent 60 essentially a rotation of the support unit 100 around the axis 59 , they inhibit rotation, but allow this in a small range, for example a few degrees or tenths of a degree. The guide profiles 60 are designed to be elastic at least to a limited extent. The guide profiles 60 are circumferentially around the axis 59 designed to be elastically displaceable. They act on the support unit 100 or the sliding seat 204 anti-rotation. They have a dampening effect. This allows rotational forces of the support unit 100 damped on the guide device 19th and finally on the chassis 45 be transmitted. The guide profiles 60 access corresponding guide profiles 61 or guide grooves of the support unit 100 . The guide profiles are advantageous 60 , 61 designed to each other in such a way that contact is ensured between them and / or there is at least a slight bias. For example, an external distance between the walls of the guide profile 60 be minimally larger than an inner distance of the corresponding Guide profile 61 . By a radial approach of the support unit 100 to the guide device 19th can spread the guide profiles 60 take place, in particular through the partially cylindrical outer surface 221 the support unit 100 (see esp. 3 and 10 ). The guide profiles 61 the sliding seat 204 or the support unit are advantageously designed essentially not to be circumferentially elastic, but at least essentially to be circumferentially rigid. They advantageously have lubricants, in particular several protruding sliding projections 222 on. There are also alternatives for generating a preload between the guide profiles 60 , 61 the support unit 100 and the guide device 19th are conceivable. In this way, play between the components can be avoided. Noise is generated and / or transmitted by the at least circumferentially elastic design of the guide means 600 or guide profiles at least reduced or dampened. The corresponding guide profiles 60 , 61 are essentially parallel to one another, in particular as bodies aligned parallel to one another, in particular surfaces, preferably sliding bodies or surfaces. They overlap radially. The two guide profiles 60 on a guide element 20th are aligned essentially parallel to one another. You are on the guide element 20th formed circumferentially elastic and radially elastic. They are connected to the guide element in the manner of a strap. They are advantageous over an angle bent by 90 ° 224 near the transition area to the rest of the guide element 20th tied up. At least one of the guide elements 20th a latching means, in particular a latching spring, is also provided for this purpose 226 (see. 3 ) in a locking device receptacle 228 to record. The locking means is provided in locking recesses 230 (in 4th not visible in more detail) on the circumferential surface of the rotating body 118 , especially the swivel seat 110 are arranged to grab. This enables a segment-wise or defined locking rotation of the rotating body 118 or the height adjustment device 16 to be provided. They also serve to prevent the rotating body from turning 118 .

Between the chassis 45 and the motor housing 33 of the motor 15th , especially between the chassis 45 and the motor housing 36 , preferably between the chassis 45 and the support unit 100 or the sliding seat 204 for holding and carrying the motor 15th and / or the motor housing 36 , are means of leadership 600 for anti-rotation and axial guidance of at least the motor housing 36 , especially the motor housing 36 , preferably the support unit 100 or the sliding seat 204 relative to the chassis 45 , around or in the direction of the vertical adjustment axis 26th provided, wherein the guide means or means 600 in the circumferential direction around the height adjustment axis 590 are designed to be elastically displaceable. The guide means 600 are transverse to, in particular radially to the height adjustment axis 590 designed to be elastically displaceable. They have an elastic, but anti-rotation effect. They enable low-friction axial sliding parallel to the height adjustment axis 590 . They have a dampening effect on the transmission of vibrations and / or noise. The guide means 600 are part of the guide device 19th or the guide elements 20th . They are particularly useful as guide profiles 60 and / or sliding surfaces and / or guide rail, in particular sliding guide rail. The guide means 600 are designed like tabs and / or on the guide device 19th or the guide elements 20th Tied like a strap, in particular in one piece with the guide elements 20th educated. On the motor housing, motor housing (not provided here) or sliding seat 204 are at least one, preferably several, corresponding in the circumferential direction and / or in the radial direction relative to the height adjustment axis 590 in particular non-elastically displaceable guide means 610 , in particular corresponding guide profiles 61 intended.

The guiding elements 20th also have radially elastic form-fitting elements 105 on. These are as a tab 106 educated. You or the tab 106 is / are parallel to the direction of the axis 59 on the guide element 20th tied up. You or the tab 106 is / are integral with the respective guide element 20th educated. You or the tab 106 is / are connected to one of four sides, in particular so that it is designed to be pivotable about the connection area. The flap is on the other three sides 106 through recesses or grooves 107 from the rest of the guide element 20th separated or exempted. The tab 106 is intended for this in relation to the axis 59 to be elastically displaceable at least in the radial direction. The tab 106 the support unit is provided for this purpose 100 play-free relative to the guide device 19th or the guide element 20th to be positioned and / or at least to be centered radially - especially with higher loads. The tab 106 serves to provide elastic support for the support unit 100 , especially radial to the axis 59 . The radially elastic form-fit elements 105 can absorb overload forces and / or dampen vibrations. You can define the spacing of at least part of the guide element 20th from the support unit 100 serve. In particular, a base of the guide element that is connected to the chassis 45 connected is. The radially elastic form-fit element 105 or the tab 106 can serve to dampen vibrations. The tab 106 can have an axial extension in the direction of the axis 59 which corresponds to at least a maximum displaceability or the degree of height adjustability. The support unit 100 can have an appendage 210 (see. 3 , 5 , 10 or 11 ) which is provided on the tab 106 to strike or to lie against. The tab 106 has a groove for it 108 on that is in the direction of the axis 59 extends. The groove 108 is to the axis 59 formed concave. As a result, the support unit is at least partially centered 100 especially in the radial and / or circumferential direction around the axis 59 enables.

Dir guide device 19th can also be used for the particularly elastically axially inhibiting rotary guidance of the rotary body 118 the height adjustment device 16 be provided, in particular for the elastically axially locking rotary guide of the sliding seat 204 rotating body 118 . The guide elements point in the upper area 20th a swivel seat 110 on. The swivel seat 110 is as a round groove 111 educated. The round groove 111 the axis also extends in the radial and circumferential directions 59 . The swivel seat 110 has elastic axial interlocking elements 112 , especially pre-tensioned tabs 114 on. The tabs 114 are in the direction of the axis 59 elastically displaceable. They are provided with a ring section 116 of the rotating body to be positioned free of play. Nevertheless, they are intended to rotate the ring section 116 in the swivel seat 110 to enable. They serve to dampen vibrations and / or avoid noise emissions. The ring section 116 is in particular integral with the rotating body 118 educated. The rotating body 118 , especially the ring section 116 of the rotating body 118 , is provided for this in the swivel seat 110 preferably to rotate with little friction. The rotating body 118 especially rotates smoothly. A game of the rotating body in the direction of the axis 59 is preferably at least due to the elastic axial form-locking elements 112 , or tabs 114 reduced. One could also say that the elastic mount of the rotating body 118 by axially elastically displaceable guide means 216 , in particular designed as elastic axial form-fitting elements 112 , especially tabs 114 or the like. (see esp. 9 and 12th )

The rotating body 118 has a substantially hollow cylindrical section. This surrounds the motor housing 36 at least partially. It extends perpendicular to the standing plane 56 and is for actuators 22nd towards at least essentially closed. To a certain extent, it has a pot-shaped shape. He is to the side of the stand level 56 open. He points the thread 206 or the threaded sections 122 on. These are on a lateral surface of the rotating body 118 arranged, in particular the outer circumferential surface, so to speak as an external thread. The rotating body 118 is provided around the axis 59 to be rotated. This can be done by motor or manually. In the exemplary embodiment shown, this is the actuating element 22nd intended. The actuator 22nd can move in the direction of actuation 24 be actuated - here rotated in the circumferential direction. The actuator 22nd is with the rotating body 118 releasably connected, here via a spline 202 . A screw 232 serves to axially secure the actuating element 22nd to the rotating body 118 . A masking agent 234 at least the cover of the screw 232 .

The support unit 100 or the sliding seat 204 shows the thread 208 or the threaded sections 124 on. These are designed as internal threads. The threaded sections 124 the support unit 100 are provided with the threaded sections 122 of the rotating body 118 to be threadedly connected. The rotating body 118 a movement of the support unit is provided for this purpose in the event of rotation 100 to drift. The support unit 100 becomes when the rotating body is rotated 118 axially displaced. The support unit 100 can thereby in the direction of the axis 59 or the height adjustment axis 590 be axially displaced. By turning the rotating body 118 there is a linear displacement of the sliding seat 204 .

The support unit 100 or the sliding seat 204 is made up of two half-shells 99 , 101 structured, but could also be structured differently. The support unit 100 is to support the drive unit 14th , in particular to support the drive unit 14th receiving motor housing 36 intended. The support unit 100 is together with the drive unit 14th and the tool holder 12th height adjustable. The support unit 100 is in particular linearly adjustable in height relative to the chassis 45 educated. Between the support unit 100 and the drive unit 14th , especially between the support unit 100 and the drive unit 14th receiving motor housing 36 , are at least one, preferably several, elastic carrying and supporting elements 102 arranged. They are provided around the drive unit 14th relative to the support unit 100 Support and carry vibration decoupling. A support is to be understood as a support in all three spatial directions via the support and support elements 102 takes place - i.e. radially, axially and in the circumferential direction. The carrying and supporting elements 102 are in particular provided around the drive unit 14th receiving motor housing 36 relative to the support unit 100 Support and carry vibration decoupling, especially in the transmission path to the chassis 45 to generate a vibration decoupling (cf. in particular 3 , 4th and 5 ) or improve. The drive unit 14th or that the drive unit 14th receiving motor housing 36 and the tool holder 12th are at least in regular operation of the implement 10 exclusively via the load-bearing and support elements 102 supported and carried or held. They are supported against the chassis 45 . You are propped up versus relative to the chassis 45 height-adjustable support unit 100 . They are supported against other components of the height adjustment unit in a vibration-decoupling manner 16 , especially the rotating body 118 and / or the guide device 19th .

4th and 5 show the support and support elements in section CC and DD 102 in a sectional view. The carrying and supporting elements 102 are block-shaped, in particular cuboid. According to 5 they are at regular intervals or angles, especially around the axis 59 , arranged to each other. There are four support and support elements 102 which are each arranged at a distance of 90 ° from one another are visible. It is, so to speak, a supporting and supporting element in each quadrant 102 arranged. You are in one plane 126 arranged. For the elastic bearing and support elements 102 are multiple recording devices 134 , 135 on which the drive unit 14th receiving motor housing 36 and on the support unit 100 intended. The recording devices 134 are used as stop surfaces 136 , 138 , 140 , 142 radial to the axis 59 and in the circumferential direction or tangentially around the axis 59 intended. The stop surfaces 138 , 142 are, especially in the case of adjacent receiving devices in the circumferential direction 134 , in opposite circumferential directions 25th through bars 144 , 146 supported. The carrying and supporting element (s) 102 and the receiving devices 134 for the elastic bearing and support element (s) 102 In adjacent quadrants, forces in opposite circumferential directions are preferably provided for this purpose 25th around the height adjustment axis 590 to support. The recording devices 134 can be shaped in such a way that they optimize geometrical moments of inertia for forces in the circumferential direction 25th are formed, for example by webs and transverse webs, for example, in the circumferential direction 25th extend.

In one level 128 parallel to the plane 126 (see. 4th ) are also four bearing and support elements 102 arranged. The carrying and supporting elements 102 which in the plane 128 are arranged are axially in an end region of the motor housing 33 arranged. The motor housing is also in this area 33 from the motor housing 36 recorded. An outer contour 130 of the drive unit 14th receiving motor housing 36 is of an inner contour 132 the support unit 100 spaced by the support and support elements 102 . A minimum distance is achieved between these components, so to speak. This serves to avoid direct vibration transmission and / or coupling. There is a vibration-decoupling effect at least during regular operation of the implement. This means that the implement is / are at least in regular operation 10 the drive unit 14th and / or the tool holder 12th and / or the drive unit 14th receiving motor housing 36 , exclusively via the elastic bearing and support element (s) 102 on the support unit 100 or the sliding seat 204 held or worn.

The elastic support and support element (s) 102 and / or the drive unit 14th and / or the drive unit 14th receiving motor housing 36 and / or the support unit 100 are designed, the drive unit 14th relative to the support unit 100 in an axial direction along the height adjustment axis 590 , radially to this and / or in the circumferential direction to this, preferably in opposite circumferential directions to this. The support unit 100 is made up of two half-shells 99 , 101 built up, the elastic support and support elements when connecting, especially when screwing 102 can compress. This pre-stresses them. With increased effort, an additional displacement of the motor mounting housing 36 relative to the support unit 100 respectively.

It is suggested that the overload protection means 148 (see esp. 4th and 5 ), especially form-fit means 152 , for example slings 154 are provided. In particular, corresponding lifting accessories 154 , 156 , 158 , 160 are where the drive unit 14th receiving motor housing 36 and the support unit 100 intended. In this way, loads that exceed a threshold value can be absorbed and / or cushioned. They are provided for this purpose when a maximum desired deformation of the elastic bearing and support elements is reached 102 to get into engagement. You can at least partially bypass the forces by bypassing the elastic support and support elements 102 from the tool 18th , the tool holder 12th , the drive unit 14th and / or the motor housing 36 on the support unit 100 and / or the chassis 45 transfer. They are used to protect against normal operation of the work equipment 10 excessive loads provided. The overload protection means 148 are designed in particular as axially, radially and / or tangentially form-closing means - relative to the axis 59 or the height adjustment axis 590 . For example, one or more on the motor housing 36 and the support unit 100 ribs formed in the axial-radial direction and / or transversely thereto in the tangential-radial direction may be provided. The form-locking elements, for example ribs, overlap in such a way that a movement in the axial, radial and / or tangential direction or circumferential direction 25th is blocked by this when shifting accordingly. Furthermore is 5 it can be seen that the motor housing 36 the drive unit 14th especially the engine 15th surrounds completely radially. The motor housing 33 is radial in relation to the axis 59 all-round at a distance from the motor housing 36 . Also the motor housing 36 is radially and axially spaced from the support element on all sides 100 educated.

The 10 and 11 it can be seen that the thread 208 the sliding seat 204 or the support unit 100 at least two threaded sections 236 , 238 having. One thread section 236 is an elastically displaceable threaded section 236 , preferably a radially and / or axially elastic to the thread axis and to the further thread section 238 displaceable thread section 236 . The thread axis is identical to the axis here 59 or the height adjustment axis 590 educated. The threaded section 236 comprises means opposite to the further threaded section 238 a thread tooth width b1 of the one thread portion 236 increase and / or a thread width gl of the one thread section 236 decrease and / or an offset in the slope P1 of the threaded sections 236 , 238 cause to each other. The thread tooth width b2 of the further thread section 238 is opposite the thread tooth width b1 of the one thread section 236 thus smaller and / or a thread pitch g2 larger. One thread section is used for elastic displaceability 236 in particular on a bracket that can be moved elastically radially to the thread axis 240 recorded. The thread 208 thus has at least one thread turn with at least two thread turn sections 236 , 238 on, the one thread portion 236 , in particular the one elastically displaceable thread section 236 , another slope P1 and / or has a different flank width b1 than the further thread section 238 or its slope P2 and / or flank width b2 (compare, for example, also an enlarged view 7th and 8th ).

The thread 208 has at least two threaded sections 236 , 238 based on the helical line of the thread 208 in the circumferential direction 25th adjoin each other, with a thread flank 242 , in particular a thread flank surface, preferably a thread tooth flank of the one relative to the further thread section 238 in relation to the helix 244 and / or the thread axis has an axial offset a1 and / or an offset a1 normal to the helical line. The thread tooth width b1 and / or flank width b1 and / or head width k1 of the one thread section 236 is larger than that of the further threaded section 238 .

So the mean here is a thread flank 242 with a different slope P1 and / or a different flank width b1 and / or a different tooth tip width k1 than that of the further thread section 238 - or their slope P2 , Flank width b2 and / or tooth tip width k2. The agent can also have a thread flank 242 , in particular a thread flank surface, preferably a thread tooth flank which is relative to the further thread section 238 an axial offset a1 and / or an offset normal to the helix 244 of the thread. Here, too, the means can have a larger thread tooth width and / or flank width b1 and / or a smaller thread turn width gl or thread tooth gap of the one thread section 236 compared to the thread tooth width b2 or flank width b2 or thread pitch width g2 or thread tooth gap of the further thread section 238 be. The thread flank 242 but can also be designed as a single flank and opposite the further threaded section 236 have an offset al.

As a result, axial play (cf. esp. 2 , 7th and 8th and see esp. BZ 246 , 248 ) the thread 206 , 208 are at least reduced to one another and / or shifted on one side. A game 246 can be narrowed down in a defined manner or shifted to an advantageous side. In the area of one thread section 236 it is advantageous on both thread or tooth flanks 242 , 243 eliminated. The tooth width or flank width b1 narrows and / or fills completely and / or on both flank sides the tooth gap width or the flank spacing of the thread 206 or the thread pitch of the thread 206 of the rotating body 118 out. Nevertheless, twisting of the thread with at least reduced backlash is possible 206 , 208 to each other still possible. On the one hand because of the threaded section 236 radially elastically displaceable to the threaded section 238 or the thread 206 of the rotating body is received and / or on the other hand, because the flanks due to the particular axial clearance 249 (see. 7th , 8th , 10 ) are axially elastic to each other. Say the tooth flanks 242 , 243 of a threaded tooth can be displaced relative to one another, in particular are designed to be displaceable relative to one another, in particular elastically displaceable relative to one another, preferably pretensioned apart. This can also or additionally be achieved by between the tooth flanks 242 , 243 of the thread tooth 252 a material notch 254 is provided. The means could at least also be a surface, in particular a sliding surface, in particular a surface which acts on the same tooth flank and which narrows a thread width. This would then not be a complete thread tooth 252 , but only one edge, e.g. the edge 242 or a body with the same effect is required.

A noise development or a rattling of the threads with respect to one another, in particular on uneven terrain and / or in the case of an unbalanced cutting device, can be advantageous 200 be avoided. Including that the one thread section 236 another slope P1 and / or other thread tooth width b1 (or flank width) or thread width gl (or thread tooth gap) is not to be understood as a tolerance and / or wear deviation. Rather, these deviations are selected or specified in the design. The flank widths b1 to b2 differ in terms of identical flank diameters. The entire elastically displaceable thread section preferably has 236 another in particular another constant slope P1 and / or flank width b1 than the further thread section 238 . But it could also at least partially have a different slope P1 and / or have a different flank width b1 than the further thread section 238 .

The threaded sections 236 , 238 are in particular along a helical line of the thread 208 and / or along the circumferential direction 25th of the thread 208 formed adjacent to one another. Between the threaded sections 236 , 238 is a groove 256 intended. The groove 256 surrounds one thread section 236 advantageous on three sides, so that one thread section 236 on a tab 240 or only on one side of the thread 208 or the sliding seat 204 or the support unit 100 is connected. The tab is, in particular, like a torsion bar on the sliding seat 204 fixed. The threaded section that can be elastically displaced radially to the thread axis 236 is about a stretch in the circumferential direction 25th to the thread axis extending section 264 on one thread 208 the sliding seat 204 tied up. The section 264 is designed as a circumferential web and / or torsion bar. The elastically displaceable threaded section 236 is on the radially elastically displaceable bracket 240 is added, in particular at one on the section 264 or circumferential web and / or torsion bar attached strap 240 , in particular recorded at a free end 266 the tab 240 , preferably spaced from the section 264 recorded, in particular spaced apart by at least one pitch P1 , P2 to the section 264 recorded. The section 264 and / or the tab 240 is / are at a distal end 258 of the thread 208 the sliding seat 204 fixed.

This results in an elastic displacement of the one threaded section 236 possible in radial direction relative to the thread axis. In connection with the notch 254 but it is also an elastic displacement of the flanks 242 , 243 possible to each other. In the circumferential direction 25th adjacent is intended to mean adjacent in the circumferential direction of the same thread turn. For illustration purposes can 7th and 8th reference another thread for this purpose. Further threaded sections advantageously extend 238 in both circumferential directions 25th starting from the elastically displaceable threaded section 236 . A helical line is, in particular, the gradient line or main gradient line or tooth flank line at a constant flank diameter and / or at the head of the thread 208 to understand. Under an incline P1 , P2 (single thread) should also be understood in this context and for the sake of simplicity as a division (multiple thread). By the aforementioned features of the one threaded section 236 can advantageously at least partially prevent the rotating body from rotating 118 to the sliding seat 204 be achieved.

One thread section 236 advantageously takes a game partially 246 between the threads 206 , 208 or between internal and external threads at least in the area of the one thread section 236 . As a result, that is advantageous but only one flank 242 , in particular thread flank or thread tooth flank of one thread section 236 axially offset al is thereby a game 250 on a flank side of the further threaded section 238 or the other threads between the threads 206 , 208 taken in total. On the axially opposite flank side 248 (see. 7th ) there is a defined, in particular constant, game 248 before that advantageous only in the case of displacement, in particular under particular load circumstances of the one thread section 236 , is reduced. This game 248 or lack of play 250 is due to the other thread sections 238 , in particular also further threads. Through the one threaded section 236 become the corresponding thread 206 , 208 thus shifted in such a way that at least one flank of the external and internal thread or of the sliding seat 204 and the rotating body 118 , rest against each other without play. The corresponding threads are advantageous 206 , 208 displaced by the flank offset a1 or the increased flank width b1 in such a way that at least one thread flank 260 of the adjoining further thread section 238 of the thread 208 and two thread flanks 242 , 243 of the one threaded section 236 backlash-free on the mating thread 206 issue. In principle, the aforementioned features with regard to the threaded sections 236 , 238 also on the thread 206 of the rotating body 118 be provided, in particular on the external thread.

The 2 shows an autonomous lawnmower having at least one chassis 45 , an engine 15th and one from the engine 15th drivable cutting device 200 , further comprising a height adjustment device 16 at least to a displacement of the cutting device 200 and the engine 15th relative to the chassis 45 , at least for setting a working height h of the cutting device 200 , in particular for setting a cutting height s of a cutting tool 18th the cutting device 200 . The height adjustment device 16 comprises a hollow cylindrical rotating body 118 and one of the hollow cylindrical rotating body 118 surrounding sliding seat 204 , the corresponding thread 206 , 208 have so that by a rotation of the rotating body 118 around the height adjustment axis 590 a linear displacement of the sliding seat 204 he follows. The thread 208 the sliding seat 204 has an at least elastically displaceable threaded section 236 on. This is elastic radially to or from the axis of rotation (axis 59 ) of the rotating body 118 displaceable thread section 236 . It's on a tab 240 elastically displaceable recorded. The elastically displaceable threaded section 236 has advantageous in with the rotating body 118 unconnected state has essentially the same core diameter as the rest of the thread 208 or the thread sections adjacent in the circumferential direction 238 on.

The motor 15th and / or the motor housing 36 are inside the rotating body 118 designed to be displaceable, in particular adjustable in height and / or radially, axially and at least slightly displaceable in the circumferential direction in order to ensure vibration-decoupling spacing. The sliding seat 204 is with the engine 15th or motor housing 36 designed to be displaceable together. The sliding seat 204 is inhibited from rotation, in particular inhibited from rotation about a height adjustment axis 590 educated. This is the axial guide devices 19th intended. This also forms a swivel seat 110 for the rotating body 118 out. Via form-fit elements 112 is the swivel seat 110 axially inhibited, elastically slightly displaceable. Via form-fit elements on the guide device 19th and the sliding seat 204 , in particular corresponding guide means 600 , 601 or guide profiles 60 , 61 , is the rotating body 118 added slightly circumferentially elastically torsion-inhibited. The guiding device 19th , especially the guide elements 20th advantageously form an additional component between the chassis 45 , the rotating body 118 and the sliding seat 204 to at least add the cutting device 200 and / or the engine 15th or the drive unit 14th Vibration decoupling and / or vibration dampening on the lawn mower 11 or chassis 45 to record. The guiding device 19th or guide elements 20th are solid to the chassis 45 connected. In particular, with their guide means, they provide at least parts of a somewhat floating mounting of the cutting device 200 and the engine 15th or the drive unit 14th and / or the height adjustment device 16 ready. The sliding seat 204 is radially inhibited from rotation by the guide device 19th .

The cutting device 200 , the motor 15th , the motor housing 36 and the sliding seat 204 are designed to be axially displaceable together. They can be moved by the height adjustment device 16 , or by turning the rotating body 118 the sliding seat 204 drives. The sliding seat 204 serves as a support device or support unit 100 for the drive unit 14th or the engine 15th and / or the engine 15th receiving motor housing 36 so that at least the cutting and reaction forces of the cutting device 200 and driving forces of the drive unit 14th via the support and support elements 102 on the sliding seat 204 be transmitted.

The motor 15th and / or the motor housing 36 are inside the rotating body 118 displaceably arranged. The rotating body 118 surrounds the engine 15th and / or the motor housing 36 at least partially, essentially completely radially. The sliding seat 204 is at least indirectly via the support and support elements 102 with the engine 15th or motor housing 36 and the cutting device 200 attached to the drive shaft 48 of the motor 15th is fixed, connected. They are designed to be displaceable together. They are designed to be anti-rotation.

The elastically displaceable threaded section 236 can be moved relative to the thread 208 the sliding seat 204 or to further thread sections 238 of the thread 208 educated. In addition, the elastically displaceable threaded section is 236 displaceable relative to the thread 206 of the rotating body 118 educated. The elastically displaceable threaded section 236 is integral with the thread 208 and / or the sliding seat 204 educated. The elastically displaceable threaded section 236 has a thread tooth width b1 which is larger and / or a thread tooth gap g1 which is smaller than the thread tooth width b2 or thread tooth gap g2 of further thread sections 238 of the thread 208 the sliding seat 204 . There are two elastically displaceable threaded sections 236 on with respect to the thread axis or the height adjustment axis 590 opposite sides provided. They engage in different threads of the thread 206 of the rotating body 118 . This in particular causes the threads to wedge 206 , 208 not to each other. The elastically displaceable threaded section or sections 236 have a thread tooth width b1 which is at least essentially the thread tooth gap of a thread turn of the rotating body 118 corresponds to. As a result, at least partially in a threaded section of the rotating body 118 Advantageously, a thread play can be reduced or eliminated in the entire thread. Due to the elastic displaceability, the threaded section 236 however, they are at least displaced or forced out radially outwards, in particular by a rotation of the rotating body 118 and sliding seat 204 to enable. In addition, the flanks 242 or tooth flanks of the elastically displaceable thread section 236 can also be designed to be elastically displaceable with respect to one another, so that the flank width b1 or the tooth width can be reduced in an elastically flexible manner when a force is applied. At least through the elastic displaceability of the / of the elastically displaceable threaded sections 236 and / or elastically displaceable flanks 242 , 243 is therefore still a rotation of the thread 206 , 208 of rotating body 118 and sliding seat 204 possible. This can also result in self-locking of the thread 206 , 208 of rotating body 118 and sliding seat 204 can be improved and / or a self-locking effect of the thread designed as a trapezoidal thread 206 , 208 be reinforced. Unintentional adjustment of the height of the height adjustment device 16 can also be avoided in this way. Even if the thread is worn 206 , 208 on rotating body 118 and / or sliding seat 204 , the elastically displaceable threaded section 236 occasionally compensate for this wear and tear. The elastically displaceable threaded section 236 could also be designed to be biased radially inward.

The elastically displaceable threaded section 236 is in the area of one of the motor receiving area of the sliding seat 204 , or to the area where the load-bearing and support elements 102 are arranged, distally arranged end 258 the sliding seat 204 arranged, in particular in the region of a distal third of the thread 206 the sliding seat 204 . This allows the elastically displaceable threaded section 236 Over the entire intended height adjustment distance in engagement with the rotating body 118 remain. It can thus be achieved that the elastically displaceable threaded section 236 In engagement with the thread over the entire height adjustment path 206 of the rotating body 118 stands. In that the elastically displaceable threaded section 236 on the sliding seat 204 , in particular arranged in this area, are not a plurality of axially offset, elastically displaceable threaded sections 236 on the sliding seat 204 required. In particular from the enlarged view in 7th and 8th also shows that one, based on the height adjustment axis 590 lower flank 260 of the thread 208 the sliding seat 204 on an upper flank 262 of the thread 206 of the rotating body 118 is present. The wider thread tooth 252 of the particularly elastically displaceable threaded section 236 is thus arranged offset in this way (cf. 11 ), here in particular by means of an offset al along the height adjustment axis 590 up that thread 208 with a lower flank 260 of the thread 208 on the thread 206 of the rotating body 118 is present. This is advantageous because it also reduces the gravity of the cutting device 200 and / or the drive unit 14th and / or the motor housing 36 the sliding seat 204 would tend to shift in that direction. In order to overcome the play, it is therefore also necessary to overcome the weight of these components. Due to the arrangement and / or design of the thread tooth on the bracket 240 which are relatively stiff in the direction of the height adjustment axis 590 is formed, is an axial displacement of the elastically displaceable threaded portion 236 at least made more difficult. Radial displacement requires less resistance. As a result, the tab is axially and not in the circumferential direction on the sliding seat 204 or on the thread 208 is fixed or fastened on one side, your flexibility in the axial direction is low or the arrangement is axially relatively stiff.

A game between the rotating body can be advantageous 118 and sliding seat 204 at least be avoided or eliminated. The elastically displaceable threaded section 236 can be provided for damping, in particular for damping vibrations. Vibrations of the cutting unit or cutting device 200 and / or the engine 15th , especially in the transmission path to the chassis 45 and / or housing 34 can be dampened. The noise emission of the lawn mower 11 can be reduced. Noise development, in particular rattling noises or the like, can be avoided. In particular, there is radial or axial play between the rotating body 118 and sliding seat 204 reduced or prevented. A rotation lock can be achieved. The rotation inhibition can, however, be overcome in the event of an intention to actuate, so that a force to be used for height adjustment remains relatively small. It is an inexpensive means of avoiding vibrations or noise.

The sliding seat 204 is also linearly displaceable on the outer surface of the rotating body 118 recorded or on its thread 206 . On the engine 15th in particular sealingly accommodating motor housing 36 is with the sliding seat 204 connected in such a way that the motor housing 36 inside the cylindrical rotating body 118 is received, in particular within an inner cylindrical lateral surface of the rotating body 118 , in particular linearly displaceable together with the sliding seat 204 . The rotating body 118 has an external thread and the sliding seat 204 an internal thread, in particular around on the outer circumferential surface of the rotating body 118 to be included in a linearly displaceable manner. This allows a very compact design of the height adjustment device 16 and / or the motor housing 36 and / or the lawn mower 11 be achieved. It becomes a the engine 15th sealed construction allows. A vibration-damping construction is made possible.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 3167703 [0016, 0028]

Claims (10)

Lawn mower (11), in particular autonomous lawn mower (11), having at least one chassis (45), a motor (15) accommodated by a motor housing (36), and a cutting device (200) which can be driven by the motor (15), further comprising a Height adjustment device (16) for displacing the cutting device (200), the motor housing (36) and the motor (15) relative to the chassis (45), at least for setting a working height (h) of the cutting device (200), in particular for setting a cutting height (s) of a cutting tool (18) of the cutting device (200), the motor housing (36) having a cover (52) and at least one base body (50), in particular a base body (50) designed as a housing pot, characterized in that the cover (52) is provided to fix the motor (15) on the motor receiving housing (36). Lawn mower (11) at least after Claim 1 , characterized in that the cover (52) is arranged between the cutting device (200) and a motor housing (33) of the motor (15) Lawn mower (11) at least according to one of the preceding claims, characterized in that the cover (52) is provided for receiving and / or fixing a drive shaft side of a motor housing (33) of the motor (15). Lawn mower (11) at least according to one of the preceding claims, characterized in that the cover (52) and the base body (50) are formed from different heat-conducting materials, in particular wherein the cover (52) is formed from a material with increased thermal conductivity, preferably a thermal conductivity that is many times higher than the thermal conductivity of the base body (50), in particular wherein the base body (50) is formed from a thermally insulating material, in particular thermally insulating plastic. Lawn mower (11) at least according to one of the preceding claims, characterized in that the cover (52) is provided for heat in the direction of a standing plane (56) of the lawn mower (11) and / or in the direction of the area of the cutting device (200), preferably directly in particular in the direction of an air flow caused by the cutting device (200), in particular in the direction of an air flow caused by a tool (18) and / or a tool holder (12) of the cutting device (200). Lawn mower (11) at least according to one of the preceding claims, characterized in that the base body (50) has a ventilation opening and / or an opening for receiving a vent (39), in particular this on the side of the base body facing away from the cover (52) (50), or is arranged at the bottom. Lawn mower (11) at least according to one of the preceding claims, characterized in that between a support unit (100) and the motor housing (36) accommodating the motor (15), at least one, preferably several elastic support and support element (s) (102) is / are arranged, preferably in order to support and carry the motor (15) relative to the support unit (100) in a vibration-decoupling manner. Lawn mower (11) at least after Claim 7 that the support unit (100) is designed to be height-adjustable relative to the chassis (45), in particular linearly displaceable in height relative to the chassis (45), in particular height-adjustable at least together with the cutting device (200), the motor (15) and / or the motor receiving housing (36) ). Lawn mower (11) at least according to one of the preceding claims, characterized in that between the chassis (45) and a support unit (100) for holding and supporting the motor and / or for holding and supporting a motor housing (36 ), Guide means (600) are provided for the rotation-inhibiting and axial guidance of the support unit (100) relative to the chassis (45) around or in the direction of the height adjustment, the guide means (600) being elastic in the circumferential direction (25) around the height adjustment axis (590) are designed to be displaceable, preferably wherein the guide means (600) are part of a guide device (19) and / or at least one guide element (20). Lawn mower (11) at least according to one of the preceding claims, characterized in that the lawn mower (11) comprises a guide device (19) which is formed separately from the chassis (45) and has at least one guide element (20) which, in relation to a height adjustment axis (590) the height adjustment device (19) is designed for at least rotation-inhibiting axial guidance of a support unit (100) or a sliding seat (204) and for at least axially inhibiting rotation guidance of a rotary body (118) of the height-adjustment device.

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