DE102015002858A1 - driving device - Google Patents

Abstract

Disclosed is a driving device 1 with a chassis 2, wherein on the chassis 2 by means of axles 10, 12 front rollers 14, 16 and rear rollers 22, 24 are arranged. According to the invention, the chassis 2 has a footprint 4 for a foot of the driver and is formed from a fiber composite material. Further disclosed is a method for producing a driving device 1 with the steps of inserting a semifinished fiber product into a mold, infiltrating the semi-finished fiber with a matrix system, curing the chassis 2 and demolding the chassis. 2

Description

The invention relates to a driving device with a chassis, which has at least one footprint, wherein on the chassis several roles are arranged by means of axes.

Rides like skateboards and longboards are available in different variants and for different driving techniques. In particular, the driving characteristics of longboards allow it to use because of the larger roles as a means of transport, for example in the city. Longboarding and other related forms of skateboarding are therefore becoming increasingly popular.

Longboards and skateboards have a relatively high weight and in particular a large thickness due to their in multi-layer wood construction, possibly in combination with composite top coats produced chassis (deck) in order to achieve the required stiffness for high bending stresses.

In contrast, the invention has for its object to provide a driving device, which has a high rigidity in bending stress and small thickness and manufacturing technology is easy to manufacture.

This object is achieved by a driving device having the features of patent claim 1. Furthermore, the object is achieved by a method with the steps of claim 9.

The driving device according to the invention has a chassis, wherein front wheels and rear rollers are arranged on the chassis by means of axles. According to the invention, the chassis has a footprint for a foot of the driver and is formed from a fiber composite material. Due to the high rigidity of the fiber composite material, the chassis can be made extremely thin, at least in the area of the footprint. As a result, a low level of the driver is achieved with correspondingly good handling characteristics. The number of items required for the unit is reduced to a minimum. The installation effort is correspondingly low.

To be particularly advantageous, it has been found that the chassis is coreless, integrally formed of a fiber composite material. Preferably, a fiber composite material based on thermoset, in particular epoxide-based is used.

As for the achievable rigidity of the chassis positive, it has been shown that the chassis is formed of a carbon fiber composite material (CFRP).

The chassis is preferably wholly or partially made of a fiber composite material with unidirectional (UD) fiber flow.

It has proven to be advantageous if the chassis of CFK-UD-scrim and / or CFK-UD-fabric is formed. Advantages are a direction-dependent, very high rigidity and strength with low weight. The flexural rigidity is very high. An extremely thin construction is possible. Furthermore, vibration characteristics and fatigue properties are very good.

The fibers preferably extend for the most part in the longitudinal direction of the chassis, i. H. from a stern section to a front section. This is referred to as a unidirectional (UD) layer in which all fibers are oriented in a single direction. Highest rigidity in the bending direction is achieved.

The fibers extend in the region of the front legs and / or the rear legs largely in the direction of the end sections, so that here too an optimum stiffness is achieved for the bending case introduced via the axes.

In the construction according to the invention, a first end portion of the axes may each be positively embedded in the leg. At a second end portion a fastener, such as a self-locking nut or screw, is arranged for fixing the roller. As a result, the number of fasteners is reduced. A direct and therefore very good introduction of force into the chassis is achieved.

• 1. Einlegen eines Faserhalbzeugs, vorzugsweise CFK-UD-Gelege und/oder CFK-UD-Gewebe, in eine Werkzeugform;
• 2. Infiltrieren des Faserhalbzeugs mit einem Matrixsystem, vorzugsweise auf Epoxidbasis;
• 3. Aushärten des Fahrgestells und
• 4. Entformen des Fahrgestells.

An inventively preferred method for producing a chassis for a driving device is carried out with the following steps:

• 1. Inserting a semifinished fiber product, preferably CFRP-UD-scrim and / or CFRP-UD-tissue, into a mold;
• 2. infiltrating the semifinished fiber product with a matrix system, preferably based on epoxy;
• 3. Curing the chassis and
• 4. Removal of the chassis.

The curing is particularly preferably carried out at elevated temperature, so that short cycle times are achieved. For this purpose, the mold can be heated electrically or by fluid flow.

The semi-finished fiber product is preferably placed dry in the mold and infiltrated after the at least largely closing the mold with a matrix system. The infiltration can be carried out by means of a Resin Transfer Molding (RTM) process.

Preferably, a vacuum is applied to the cavity of the mold before and / or during infiltration (vacuum build-up, vacuum pump).

A fiber composite chassis preferably has a thickness in the range from about 3 to 10 mm, preferably from about 4 to 7 mm, at least in the area of the standing surface. The chassis advantageously has a constant thickness in the area of the base.

The thickness of the knuckle is preferably in the range of about 3 to 12 mm, preferably about 4 to 6 mm.

Within the chassis, low-cost, high-strength carbon fiber rovings can be processed. Manufacturing technology and optical, it may be advantageous if the upper cover layer and / or the lower cover layer is made of carbon fiber fabric. As a result, an attractive appearance with visible tissue structure is achieved.

In a particularly preferred embodiment of the invention, the chassis has a footprint for a foot of the driver, wherein the footprint is disposed below an axis plane at least one roller axis. As a result, a low level is achieved in spite of good for a good rolling behavior on uneven ground and high speeds necessary large roles. The low-lying footprint also allows a safe level of the driver, which comes close to the natural walking position while walking. The driving device is therefore easy to drive and for a wide circle of users a suitable means of transportation. The locomotion takes place here standing by pushing off with one leg, with one foot is on the floor space (pushing). The surface near the base allows this case even with prolonged driving a largely fatigue-free movement, since the front leg only greatly reduces a stair climbing similar movement performs.

It has proven to be particularly advantageous if the rollers have a diameter of about 75 to 150 mm, preferably from about 90 to 100 mm. Rollers of this size offer an optimal rolling behavior even on uneven ground, such as paved or paved footpaths and cycle paths, pedestrian areas and the like, as well as smaller obstacles such as pebbles etc. The damping properties of larger rollers are also advantageous so that bumps are compensated and the rolling noise is minimized.

Preferably, narrow rolls having a width in the range of about 20 to 50 mm, in particular about 23 mm are used. Such narrow rollers offer low rolling resistance on the one hand and on the other hand, they are less prone to smaller obstacles, such as pebbles, etc. on the road, as they are deflected by the role and not overrun or block the role. With regard to rolling resistance and driving comfort, a round or elliptical uprising cross section of the rollers is particularly advantageous.

The front rollers have a Frontrollendurchmesser and the rear rollers on a rear roller diameter, wherein the two diameters are equal in a preferred embodiment.

In an advantageous embodiment of the invention, the footprint to a Aufstandebene of the rollers, d. H. to a surface to be traveled, a distance X less than about 30 mm.

Particularly preferred is a distance X equal to or possibly less than about 20 mm. For example, with a thickness of the chassis of 5 mm, the ground clearance is 15 mm. This low stand offers agile handling and a particularly safe, comfortable stand for the driver. The roll diameter is in this case preferred variant about 90 mm.

An advantage of the driving device according to the invention lies in the fact that the handling is more dynamic due to the low footprint and compact dimensions with very short wheelbase than the two-wheeled scooters, three-wheel kickboards or skateboards. This is especially true for fast turns and turns.

Due to the low floor space, it is also much easier to drive than other high-floor equipment such as skateboards, longboards or kickboards.

In one embodiment of the invention, the chassis may have a length L in the range of about 180 to 360 mm, preferably from about 220 to 300 mm, since the footprint only has to be designed for a foot length. The central width of the chassis is preferably in the range of about 50 to 120 mm, in particular from about 60 to 80 mm. The driving device is therefore extremely compact to transport. For example, this can be grasped in the middle with one hand. Further, the driving device can be fixed to a carrying bag such as a backpack or the like. For fixation on the carrying case, bands already provided on the driving device for foot fixing can be advantageously used.

The chassis of the driving device according to a preferred embodiment has a Front portion and a rear portion, wherein the front portion at least two front rollers and the rear portion are assigned at least two rear rollers. Due to the four-wheeled running device, a high driving stability is achieved compared to two- or three-wheeled driving devices, such as scooters or kickboards. The tipping risk is largely minimized, so that the driver in the state but also at higher speeds a sure driving feeling is conveyed.

Preferably, the axes of the front rollers and the axles of the rear rollers are arranged in a common plane. The footprint advantageously extends parallel to the contact surface of the rollers, d. H. parallel to a surface to be traveled. When the driver is loaded on the driver's foot, this prevents an undesired tilting of the driver forward or backward, as is the case with a front or rear inclined footprint.

In a preferred embodiment of the driving device, the chassis on a left front leg and a right front leg for attachment of the front rollers by means of a separate axis.

The height of the front legs is according to an embodiment of the invention measured from the underside of the chassis about 30 to 60 mm, preferably about 40 to 50 mm. This makes it possible to attach the front axles at a sufficient height above the floor space.

The length of the front legs, measured in the area of the base, is preferably in the range of about 30 to 60 mm, in particular 40 to 50 mm. A length in this range provides sufficient strength with compact dimensions and low weight.

Advantageously, the chassis in the front view has an approximately U-shaped cross-section consisting of the base, the left front leg and the right front leg. As a result, a compact design with minimal width is achieved in the front area.

The chassis has in a preferred embodiment, a left rear leg and a right rear leg for attachment of the rear wheels by means of a separate axis.

The length of the rear legs measured in the area of the base is preferably in the range of about 30 to 90 mm, in particular 50 to 65 mm. A length in this range provides sufficient strength with compact dimensions and low weight.

The chassis can have an approximately H-shaped basic shape in plan view from above.

Here, the chassis in the rear view has an approximately U-shaped cross-section consisting of the base and the left rear leg and the right rear leg. The area between the front and rear legs is accordingly freely available for the driver's foot. As a result, a compact design with minimum width is also made possible in the rear area.

It has proved to be particularly advantageous if the front legs and / or the rear legs extend at an angle of approximately 90 ° to the standing surface, which is preferably arranged parallel to the ground. The loading direction of the radial ball bearings of the rollers is optimal. This minimizes rolling resistance and wear.

The front legs are preferably arranged in the front end region of the chassis. In particular, the leading edges of the front legs can be flush with the front edge of the stand. Overall, a maximum wheelbase is possible with compact dimensions of the driving device, which leads to a very good driving behavior.

According to a preferred embodiment of the invention, the front and rear rollers with a fixed axis alignment, d. H. not steerable arranged on the chassis. Due to the short wheelbase between front wheels and rear rollers, the ride can be steered without tilting the footprint based on the slip between rollers and roadway by body movements alone and by the impulse of the repulsive rear foot. With the driving device according to the invention can thus also drive tight curve radii. Overall, the design provides agile handling and high stability even when driving straight ahead. The driver has a secure footing, since the base surface, similar to the one used during walking, does not tilt around the longitudinal axis or around the transverse axis.

It has proved to be particularly advantageous if at least one support section with a support surface is provided for the second foot of the driver, wherein the support surface is arranged at least in sections above a rear roller. As a result, an extremely compact design is made possible because the driving device can have a small width. The foot position of the driver here is similar to the natural human parallel state, so that the position is easy to learn and gives a secure feeling. Furthermore, a stable state for the driver is made possible by that the support force acts directly on the rear roller from above. Preferably, the support surface is arranged such that no torque and thus no driving stability impairing tilting moment results when the driver places his rear foot on the support surface. Due to the four-wheeled running device is achieved even when standing with two feet compared to two- or three-wheeled vehicles, such as scooters or kickboards, a high driving stability. The tipping risk is largely minimized, so that the driver in the state but also at higher speeds a sure driving feeling is conveyed.

According to the invention it is particularly preferred if above each rear roller a support portion is formed with a support surface. The driving device preferably has two supporting surfaces. As a result, depending on the preferred first base of the driver, for example, the left foot, the support surface can be used right for the second foot. Accordingly, in a preferred right foot the left support surface can be used for the second foot. The stand can of course be chosen arbitrarily by the driver. The same applies to the choice of left or right Stützfäche. It is essential that no further support surfaces are required. In particular, no support surfaces in the area of the footprint of the first foot are required for the second foot. As a disadvantage, have also been found behind the first foot arranged support surfaces.

In an advantageous embodiment, an end portion of the rear leg extends to the region of the rear roller approximately parallel to the base and forms above the roller from the support surface for the second foot of the driver.

The standing area of the first, front foot and the standing area of the second, rear foot is in this variant offset in height on different levels.

The height of the rear legs is preferably dimensioned such that between the rear roller and the underside of the support portion is a distance of about 4 to 15 mm, so that rubbing is reliably prevented.

The wheelbase between the front rollers and the rear rollers is preferably in the range of about 150 to 350 mm, preferably from about 180 to 240 mm. Such a small wheelbase results in agile handling with compact exterior dimensions.

The front rollers have in a preferred variant to each other at a distance in the range of about 90 to 180 mm, preferably from about 100 to 140 mm. The distance is preferably adjusted with little addition to the rider's front width.

A further embodiment of the driving device is characterized in that the rear rollers have a distance in the range of about 70 to 180 mm, preferably from about 80 to 120 mm to each other. This distance is preferably adjusted with little addition to the shoe heel width of the driver.

According to the invention, it was further recognized that it is advantageous if the distance between the rear rollers is smaller than the distance between the front rollers to each other. The second foot used by the driver as a pulse generator can in this case be moved very close to the side of the driving device and ensures an optimum forward momentum. The risk of wheel contact is minimized. In this case also a normal walking nachempfundener and therefore more pleasant for the driver, safer and reduced fatigue movement is achieved.

The ratio of the distance AF of the front rollers to each other to the wheelbase RS (center distance between front rollers and rear rollers) is preferably about AF / RS = 0.5 to AF / RS = 0.7.

In the rear area, it has proven to be advantageous to provide a rear boundary in the form of a heel support.

In one embodiment of the invention, the axes of the rear rollers in the axial direction at a distance in the range of about 10 to 40 mm, preferably about 20 to 30 mm, from a contact surface of the heel support. Here, an optimal adapted to the body's center of gravity driving stability is achieved. A further offset heel of the driver could lead to a tilting of the driving device to the rear.

Nevertheless, the force effect in the area of the rear rollers is greater than in the area of the front wheels, so that an agile steering behavior is achieved due to the weight reduction of the front wheels. Here, the slip of the front rollers for direction changes can be used particularly advantageous.

According to an advantageous embodiment of the chassis is composed of front legs, rear legs and connecting them central area in the side view substantially U-shaped. The result is a compact, lightweight and visually appealing, high-aesthetic design.

Preferably, at least one rear roller, preferably two rear rollers, one with the Assigned foot operated brake device that can be pressed by the user with the foot against a spring action down to thereby rub against the rear rollers and thus to develop a braking effect. The braking device acts coupled, simultaneously on both rear rollers, so that no steering torque is generated. Alternatively, the brake device can act individually on the rear rollers, so that a steering effect is achieved. For example, braking the right-hand rear roller results in steering movement of the vehicle to the right. Accordingly, a braking of the left rear roller leads to a steering movement of the vehicle to the left.

It has proved to be particularly advantageous if a fastening device is provided for a foot of the driver. Here, the arranged on the floor foot of the driver is fixed to the chassis. The application of force to the drive is thereby optimized. Furthermore, the fixed at the foot of the driver driving over obstacles, such as curbs, etc., can be lifted.

In a particularly preferred embodiment of a fastening device, a fastening arrangement is provided, which is fastened in an essentially X-shaped manner on the chassis.

According to a preferred variant of the invention, at least one textile band is provided as a fastening element. These are available in different designs in terms of material and design. Preferably, ribbons having a width of about 20 mm and / or a thickness of about 1.5 to 2 mm are used. These provide sufficient strength and pressure distribution. Alternatively belts can be used.

Preferably, a circumferential band crosses or cross over two bands or two band portions in the region of the back of the foot in the vicinity of the tibial extension. It is particularly advantageous if a first band or a first band section surrounds the foot on the right side starting from the front left, wherein a second band or a second band section from the front right embraces the foot on the left side. As a result, the foot is centered on the stand, fixed to the rear and securely fixed. A first band or a first band section supports the foot on the left side and a second band or a second band section on the right side. In particular, in this solution, the front foot region and the rear foot region or heel region are centered relative to the dimensions of the driving device. The foot is thereby defined in its position on the footprint positioned. An optimal introduction of force for the forward drive but also power pulses for steering movements is given. Another advantage of this arrangement with diagonally from front to rear fastening elements relative to the foot only from left to right cross-attachment devices (Velcro straps, buckles, etc.) is the large force application to the foot. As a result, the pressure distribution without individual pressure points for the driver is pleasant. Also a running similar movement is possible, for example, od to a green area. The like. To overcome.

The fastening elements are preferably fixed in each case in the region of the front axle legs and in the region of the rear section on the chassis. In particular, the fastening elements can be arranged at the rear in the region of the heel support. As a result, the centering effect in the area of the heel is further improved, since the fastening elements at least partially surround and centrally hold the heel area of the foot.

The bands are at least partially elastic in an advantageous embodiment of the driving device. The elasticity improves the uniform and steady concern of the bands on the driver's shoe.

The textile bands may have a front end portion, which is fixed in the region of the front legs, preferably in the transition region front leg to stand surface. The end portions may be connected to the chassis by means of fastening screws.

Alternatively, at least one end portion of the textile bands can be suspended on the chassis. The advantage here is that the assembly of the bands can be done without tools. Furthermore, the positioning can be done flexibly by means of sliding along the chassis suspension elements. This makes it easy to adapt to the driver's foot.

It has proven to be particularly advantageous if a rear section of the fastening elements is arranged in the region of the heel support.

In the region of the heel support, in an embodiment according to the invention, at least one recess, in particular a slot, is provided for the band leadthrough. It is advantageous if two adjacently arranged slots are provided. The slots extend approximately perpendicular and parallel to each other. In the case of a heel support arranged centrally in the rear region, the heel is likewise arranged centrally by means of the fastening arrangement and securely fixed on account of the course of the band.

At least one band may preferably be separable via a closure element. The driver can divide the belt before ascending to the driving device, ascend and then lock again over the lock. This allows in particular a simple rise from the top of the stand. The driver does not have to thread his foot under ribbons, but places his foot on the stand and then locks the straps.

It is therefore particularly advantageous if both bands are each separable via a closure element.

As a closure element advantageously a plug buckle is provided. The band can be fixed to the buckle adjustable. For example, the band is passed on one side of the plug buckle. The driver places his foot on the base of the chassis, puts the buckle elements together and then pulls the straps tight. As a result, the fastening arrangement is adaptable to different shoe sizes and shoe shapes of the driver. Furthermore, the fixing force is adaptable to the needs of the driver.

Alternatively, at least one hook-and-loop fastener is provided as closure element. This can allow in addition to the divisibility adjustability, so that a simple entry to the floor space and adjusting the holding force is possible.

The fasteners may continue to be suspended from the chassis protruding suspension elements.

The fasteners may alternatively comprise pin-shaped hooking body, which can be inserted in recesses, such as holes in the chassis. A recess matrix may be provided with axially offset holes. As a result, length settings are possible.

Alternatively, strings can be used instead of the bands. Here, the force on the foot is essentially linear.

Other advantageous developments of the invention are part of the further subclaims.

In the following, a preferred embodiment of the invention is explained in more detail with reference to schematic drawings. Show it:

1 a spatial representation of the driving device;

2 a side view of the driving device;

3 a plan view of the driving device;

4 a front view of the driving device;

5 a rear view of the driving device and

6 a view from below of the driving device.

1 shows a driving device according to the invention 1 with a chassis 2 , which is a stand area 4 having. The chassis 2 of the driving device 1 has a front section 6 and a stern section 8th , where the front section 6 about axes 10 . 12 two front wheels 14 . 16 and the stern section 8th about axes 18 . 20 two rear rollers 22 . 24 assigned. The stand area 4 is designed for a foot (not shown) of the driver and below a schematically illustrated axial plane 26 which are the centers of the roller axes 10 . 12 . 18 . 20 span, arranged.

In particular 2 it can be seen which a side view of the driving device 1 out 1 shows, indicates the footprint 4 to a riot level 28 the roles 14 . 16 . 22 . 24 , ie to a surface to be traveled, a distance X of about 20 mm. The thickness t of the chassis is in the range of about 5 mm, so that the ground clearance f is 15 mm. The deep footprint 4 offers an agile driving and a pleasant movement for the driver. The low-lying stand area 4 also allows a safe state of the driver, which comes close to the natural walking position while walking. The driving device 1 is therefore easy to drive and for a wide circle of users a suitable means of transportation. The underground 28 nearby booth 4 allows a largely fatigue-free movement even when driving longer, as the front, on the floor space 4 arranged leg of the driver only greatly reduces a stair climbing similar movement performs.

The front wheels 14 . 16 and stern rollers 22 . 24 have a diameter D of about 90 mm. Rollers of this size offer optimum rollability even on uneven ground, such as walkways, pedestrian areas and the like. The damping properties of larger wheels are also better, so that bumps are compensated and the rolling noise is minimized.

As in 3 is shown, which is a plan view of the driving device 1 out 1 shows, points the chassis 2 in plan view, an approximately H-shaped basic shape.

The width b of the rolls 14 . 16 . 22 . 24 is about 23 mm. Such narrow rollers offer low rolling resistance on the one hand and on the other hand, they are less susceptible to smaller stones on the road, as they are distracted from the role and not be rolled over or block the role. Particularly advantageous here is a round or elliptical contact cross-section q of the rollers 14 . 16 . 22 . 24 (as on the front wheels 14 . 16 shown the rear wheels 22 . 24 are shown only simplified).

Due to the four-wheeled running device 1 is achieved compared to two- or three-wheeled vehicles, such as scooters or kickboards, a high driving stability. The tipping risk is largely minimized, so that the driver in the state but also at higher speeds a sure driving feeling is conveyed.

According to the 1 and 2 are the axes 10 . 12 the front wheels 14 . 16 and the axes 18 . 20 the stern rollers 22 . 24 in a common axis plane 26 arranged. The stand area 4 therefore extends parallel to the uprising level 28 the roles 14 . 16 . 22 . 24 , ie parallel to a surface to be traveled. At the load of the driving device 1 An undesired forward or rearward tilting of the driver is thus prevented over the driver's foot, as is the case with a front or rear inclined footprint.

As in particular in 4 is shown, which is a front view of the driving device 1 out 1 shows, points the chassis 2 a left front leg 30 and a right front leg 32 for fastening the front rollers 14 . 16 each with a separate axis 10 . 12 on. The chassis has in front view an approximately U-shaped cross-section consisting of the base 4 , the left front leg 30 and the right front leg 32 , As a result, a compact design is achieved in the front area adapted to the shoe width of the driver in the forefoot, minimum width.

As 1 shows are the front legs 30 . 32 in the front end of the chassis 2 arranged. leading edge 34 the front leg 30 . 32 close flush with a front side 36 the stand area 4 from. Overall, this is compact dimensions of the driving device 1 a maximum wheelbase possible, which leads to a very good driving behavior. The driver's shoe here can be the footprint 4 tower over to the front.

According to 4 the height hf is the front leg 30 . 32 measured from a bottom 38 of the chassis 2 about 45 mm. This is an attachment of the front axles 10 . 12 at a sufficient height above the stand area 4 possible.

As 3 it can be seen that the length lf is the front leg 30 . 32 measured in the area of the stand area 4 in the range of about 45 mm. A length lf in this range provides sufficient strength with compact dimensions and low weight.

5 shows a rear view of the driving device 1 out 1 , according to which the chassis 2 also a left rear leg 40 and a right rear leg 42 for fixing the rear wheels 22 . 24 each with a separate axis 18 . 20 having. The chassis 2 has in the rear view an approximately U-shaped cross-section consisting of the base 4 , the left rear leg 40 and the right rear leg 42 on. The area between the front and rear legs is accordingly freely available for the driver's foot. As a result, a compact design with minimum width is also made possible in the rear area. The width is adapted to the shoe width in the heel area.

How out 4 it can be seen extending front legs 30 . 32 and rear legs 40 . 42 at an angle of about 90 ° to the base 4 , which is arranged parallel to the ground. The loading direction of the radial ball bearings, not shown, of the rollers is optimal here. This minimizes rolling resistance and wear.

The front and rear legs are connected to the floor area with a radius optimized for the introduction of force.

In particular 3 shows are the front and rear wheels 14 . 16 . 22 . 24 with a fixed axis alignment, ie not steerable on the chassis 2 arranged. Due to the short wheelbase RS between the front wheels 14 . 16 and the stern rollers 22 . 24 can the driving device 1 without inclination of the stand surface 4 based on the slip between rollers and roadway by body movements alone and by the impulse of the repulsive rear foot are directed. With the driving device according to the invention 1 can thus also drive tight curve radii. Overall, the design provides agile handling and high stability even when driving straight ahead. The driver has a secure footing, as the footprint 4 similar to the usual during walking surface in the state and when driving neither about the longitudinal axis nor about the transverse axis tends. The outer dimensions are minimal despite large roll diameter.

For the second foot of the driver are support sections 44 . 46 with support surfaces 48 . 50 provided, the support surfaces 48 . 50 in the middle above the rear rollers 22 . 24 are arranged. In each case, an end section extends 51 of the rear leg 40 . 42 after the area of the stern roller 22 . 24 offset in height approximately parallel to the base 4 and forms the support surface above the roller 48 . 50 for the second foot of the driver. This will an extremely compact design allows, as the driving device 1 may have a small width. The foot position of the driver here is similar to the natural human parallel state, so that the position is easy to learn and gives a secure feeling. Furthermore, a stable state for the driver is made possible by the fact that the support force directly from above the rear roller 22 . 24 acts. Preferably, the support surface 48 . 50 arranged such that no torque and thus no driving stability impairing tipping moment results when the driver has his rear foot on the support surface 48 . 50 provides. Due to the four-wheeled running device 1 is also achieved when standing with two feet compared to two- or three-wheeled driving equipment, such as scooters or kickboards, a high driving stability. The tipping risk is largely minimized, so that the driver in the state but also at higher speeds a sure driving feeling is conveyed.

As a result, depending on the preferred first base of the driver, for example, the left foot, the support surface 48 be used right for the second foot. Accordingly, in a preferred right foot, the left support surface 50 be used for the second foot. The stand can of course be chosen arbitrarily by the driver. The same applies to the choice of the left or right support surface 48 . 50 ,

According to 5 is the height hh of the rear legs 40 . 42 is sized such that between the rear rollers 22 . 24 and the bottom 52 of the support section 44 . 46 a distance of about 5 mm, so that a rubbing is reliably prevented.

As in particular in the 1 and 3 shown is for the on the stand area 4 positioned foot of the driver a fastening device 54 provided by means of which on the stand 4 arranged foot of the driver on the chassis 2 can be fixed. The force on the driving device 1 is thereby optimized. Furthermore, the fixed at the foot of the driver driving 1 be lifted above obstacles, such as curbs, etc.

As a fastening device 54 is a mounting arrangement 56 provided, which is substantially X-shaped on the chassis 2 is attached. As fasteners 58 textile tapes are provided with a width of about 20 mm and a thickness of about 1.5 mm.

Here a circulating band crosses over 58 near the back of the foot near the tibia. A first band section 60 Circumcircles from the front left beginning the foot on the right, with a second band section 62 starting from the front right, the foot on the left embraces. This will make the foot on the stand area 4 centered on both sides, fixed backwards and securely fixed. In particular, in this solution, the front foot area and the rear foot area or heel area relative to the dimensions of the driving device 1 centered. The direction of travel is thereby optimally adjusted based on the Fußlängsachse. The foot is thus defined in its position on the floor space 4 positioned. An optimal introduction of force for the forward drive but also for power pulses during steering movements is given. Another advantage of this arrangement with diagonally from front to back extending tape sections 60 . 62 compared to the foot only from left to right cross-fasteners according to the prior art, the large force application to the foot. As a result, the pressure distribution takes place without individual pressure points.

The textile band 58 has front end sections 64 , which are in the area of the front legs 30 . 32 in the transitional front leg 30 . 32 to floor space 4 are fixed. The end sections 64 are with the chassis 2 by means of fastening screws (not shown).

In the area of a heel support provided in the rear area 66 are two slot-shaped recesses 68 . 70 intended for tape feedthrough. The adjacent slots 68 . 70 extend approximately perpendicular and parallel to each other. Due to the heel support arranged centrally in the rear area 66 is the heel by means of the fastening arrangement 56 also arranged centrally and securely fixed due to the band profile. As a result, the centering effect in the area of the heel is further improved, since the fastening element 58 the heel area of the foot at least partially surrounds and fixed in the middle.

The axes 18 . 20 the stern rollers 22 . 24 have a distance Y in the axial direction (see 3 ) in the range of about 25 mm from a contact surface 74 the heel support 66 on. Here, an optimal adapted to the body's center of gravity driving stability is achieved. A further offset heel of the driver could lead to a tilting of the driving device to the rear. Nevertheless, the force effect in the area of the rear rollers 22 . 24 larger than in the area of the front wheels 14 . 16 , so due to the weight reduction of the front wheels 14 . 16 an agile steering behavior is achieved. This may be the slippage of the front wheels 14 . 16 be used particularly advantageous for changes in direction.

The ribbon 58 is about two as buckles 72 (please refer 3 ) formed closure elements separable. The driver can do the tape 58 before getting on the driving device 1 share, ascend and then over the clasp again 72 lock. This allows in particular a simple rise from the top of the stand 4 , The driver does not have to thread his foot under ribbons, but places his foot on the stand 4 and then locks the band 58 ,

The ribbon 58 is on the buckles 72 Fixed adjustable on one side. For this is the tape 58 each on one side of the plug buckle 72 passed through (not shown). The driver puts his foot to the application of the driving device 1 on the stand area 4 of the chassis 2 , inserts in each case the two buckle elements of the buckles 72 together and then pulls the passed-through tape ends firmly. This is the mounting arrangement 56 adaptable to different shoe sizes and shoe shapes of the driver. Furthermore, the fixing force is adaptable to the needs of the driver.

In the illustrated embodiment of the driving device 1 the wheelbase RS is between the front wheels 14 . 16 and the stern rollers 22 . 24 about 200 mm. According to 4 assign the front wheels 14 . 16 each other a distance AF in the range of about 120 mm. The stern rollers 22 . 24 are spaced from each other by a distance AH of about 100 mm. The second foot used by the driver as a pulse generator can be very close to the side of the drive 1 be moved along and ensures an optimal forward momentum. The risk of wheel contact is minimized. This is a normal walking inspired and therefore more pleasant for the driver, safer and reduced fatigue movement achieved.

The ratio of the distance AF of the front wheels 14 . 16 to each other to the wheelbase RS (center distance between front rollers and rear rollers) is about AF / RS = 0.6.

How out 6 it can be seen which is a bottom view of the driving device 1 out 1 shows, has the chassis 2 a length L in the range of about 240 mm. The central average width B of the chassis 2 is in the range of about 80 mm. The driving device 1 is therefore extremely compact to transport. For example, this can be grasped in the middle with one hand. Furthermore, the driving device 1 on a carrying bag, such as a backpack od. Like. Be fixed. For fixation on the carrying case, the band already provided on the driving device for foot fixing can be advantageously used.

The chassis 2 is formed according to the invention of a fiber composite material. Due to the high rigidity of the fiber composite material is the chassis 2 extremely thin. As a result, a particularly low level of the driver is achieved with correspondingly good handling characteristics. The number of items required for the unit is reduced to a minimum. The installation effort is correspondingly low.

The chassis 2 is coreless, integrally formed from the fiber composite material. Preferably, a fiber composite material based on thermoset, in particular epoxide-based is used.

As regards the achievable rigidity of the chassis 2 positive it has been shown when the chassis is made of a carbon fiber composite material (CFRP). The chassis 2 preferably consists wholly or partly of a fiber composite material with unidirectional (UD) fiber profile. Advantages are a direction-dependent, very high rigidity and strength with low weight. The flexural rigidity is very high. An extremely thin construction is possible. Furthermore, vibration characteristics and fatigue properties are very good.

The carbon fibers extend for the most part in the longitudinal direction of the chassis, ie from the rear section 8th to the front section 6 out. Highest rigidity in the bending direction is achieved.

In the area of the front legs 30 . 32 and the rear leg 40 . 42 For the most part, the carbon fibers extend toward the end portions 51 out, so here too one for the over the axes 10 . 12 . 18 . 20 initiated flexure optimum rigidity is achieved.

• 1. Einlegen des auf Kohlenstofffasern basierenden Faserhalbzeugs in eine Werkzeugform,
• 2. Infiltrieren des Faserhalbzeugs mit einem Matrixsystem auf Epoxidbasis,
• 3. Aushärten des Fahrgestells 2 und
• 4. Entformen des Fahrgestells 2.

The production of the chassis 2 takes place with the steps:

• 1. inserting the carbon fiber-based semifinished fiber product into a tool mold,
• 2. infiltrating the semifinished fiber product with an epoxy-based matrix system,
• 3. Hardening of the chassis 2 and
• 4. Removal of the chassis 2 ,

The semi-finished fiber is placed dry in the tool mold and infiltrated after the at least largely closing the mold with the matrix system. For this purpose, a vacuum is applied to the cavity of the mold before and during infiltration by means of a vacuum pump.

The curing takes place at elevated temperature, so that short cycle times are achieved. For this purpose, the mold is heated electrically by means of embedded resistor.

The finished fiber composite chassis 2 has a thickness of about 5 mm. The thickness of the knuckle 30 . 32 . 40 . 42 is also about 5 mm.

In an alternative embodiment, only the marginal layers of the chassis are 2 made of carbon fiber composite material. The middle region is made of a different material, preferably made of glass fiber reinforced plastic. As a result, a more cost-effective structure is achieved. However, the thickness of the chassis and thus the height of the stand here are slightly larger with the same rigidity.

Disclosed is a driving device 1 with a chassis 2 , being attached to the chassis 2 by means of axes 10 . 12 front wheels 14 . 16 and stern rollers 22 . 24 are arranged. According to the invention, the chassis 2 a stand space 4 for a foot of the driver and is formed of a fiber composite material. Further disclosed is a method for manufacturing a driving device 1 with the steps of inserting a semi-finished fiber into a tool mold, infiltrating the semi-finished fiber with a matrix system, hardening of the chassis 2 and demoulding the chassis 2 ,

LIST OF REFERENCE NUMBERS

1

driving device

2

chassis

4

footprint

6

front section

8th

tail section

10

axis

12

axis

14

left front roller

16

right front role

18

axis

20

axis

22

left rear roller

24

right rear roller

26

axis plane

28

standing plane

30

left front leg

32

right front leg

34

leading edge

36

front

38

bottom

40

left rear leg

42

right rear leg

44

right support section

46

left support section

48

right support surface

50

left support surface

51

end

52

bottom

54

fastening device

56

mounting assembly

58

Fastening element (band)

60

first band section

62

second band section

64

front end section

66

heel support

68

recess

70

recess

72

buckle

74

contact surface

Claims (10)

Driving device ( 1 ) with a chassis ( 2 ), wherein on the chassis ( 2 ) by means of axes ( 10 . 12 ) Front rollers ( 14 . 16 ) and rear rollers ( 22 . 24 ) are arranged, characterized in that the chassis ( 2 ) a stand area ( 4 ) for a foot of the driver and is formed of a fiber composite material. A driving device according to claim 1, wherein the chassis ( 2 ) coreless, integrally formed of a fiber composite material. Driving device according to claim 1 or 2, wherein the chassis ( 2 ) is formed of a carbon fiber composite material. Driving device according to one of the preceding claims, wherein the fibers of the composite material at least largely in the longitudinal direction of the chassis ( 2 ). Driving device according to one of the preceding claims, wherein the fibers in the region of front legs ( 30 . 32 ) and / or rear legs ( 40 . 42 ) mostly in the direction of free end sections ( 51 ) extend the legs out. Driving device according to one of the preceding claims, wherein a first end portion of the axles ( 10 . 12 . 18 . 20 ) in each case form-fitting in the leg ( 30 . 32 . 40 . 42 ) is embedded. Driving device according to one of the preceding claims, wherein the chassis ( 2 ) has a thickness in the range of about 3 to 12 mm, preferably about 4 to 6 mm. Driving device according to one of the preceding claims, wherein at least one rear leg ( 40 . 42 ) a support section ( 44 . 46 ) with a support surface ( 48 . 50 ) having. Method for producing a driving device ( 1 ), with a chassis ( 2 ) at least with the following steps: A. inserting a semifinished fiber product into a tool mold; B. infiltrating the semifinished fiber product with a matrix system, preferably epoxy-based; C. Hardening of the chassis ( 2 ) and D. demoulding the chassis ( 2 ). The method of claim 9 wherein the infiltration is by a resin transfer molding process.

Images