AT528251A1 - Power lift with electric drive unit - Google Patents

Abstract

Power lift for a vehicle, comprising at least a base frame (1) for attaching the power lift to the vehicle, a support and drive unit (2) for carrying and driving an implement, as well as at least one top link (3) and at least one lower link (4), wherein the support and drive unit (2) is articulated to the base frame (1) via top link (3) and lower link (4), wherein the power lift comprises at least one electric drive (5) for driving the implement.

Description

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Ing. Johann Höllwart 1/17 24041P-AT

Power lift with electric drive unit

[0001] The present invention relates to a power lift for a vehicle, and to a vehicle, in particular an electric municipal vehicle, with at least one

such power lifters.

State of the art

[0002] Power lifts are generally known from the prior art. These are used on (commercial) vehicles to lift attachments (work implements), such as sweepers, mowers, cutter bars, mulchers, snow blowers and (snow) plows,

to couple and lift.

[0003] To drive corresponding attachments, in particular sweepers, mowers, cutter bars, mulchers, and snow blowers, the power take-off (PTO) of the respective vehicle is generally used. For this purpose, the attachment is connected to the vehicle's PTO via a driveshaft, thus providing the necessary drive energy. However, this requires certain structural features of the vehicle, particularly in the front and rear areas, and

This therefore represents a limitation regarding vehicle design.

[0004] Furthermore, this type of supplying the implement with drive energy requires a force-transmitting connection between the vehicle and the implement, which must function reliably even when relative movements between the vehicle and the implement are mediated by the power lift. In particular, if these relative movements change the distance between the vehicle's power take-off shaft and the implement's connection point, drive shafts with two universal joints and a thrust joint for longitudinal compensation must be used. However, with increasing articulation angle and increasing torque, the efficiency decreases and wear increases.

Probability of failure of such drive shafts.

[0005] Alternatively, attachments with their own drive can be used. Naturally, such attachments are more expensive than attachments

without its own drive.

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Object of the invention

[0006] The present invention therefore aims to enable a particularly efficient and reliable coupling of an attachment to a commercial vehicle. A further objective is to enable the supply of drive energy to the attachment with high efficiency and essentially independently of any relative movement or working position of the attachment.

The tasks of the invention become apparent from the description.

Description of the invention

[0007] One object of the invention is solved by a power lift for a vehicle, in particular for a commercial vehicle, for example a municipal vehicle, comprising

at least a. a base frame for attaching the power lift to the vehicle,

b. a carrying and drive unit for carrying and driving a

attachment, as well as

c. at least one top link and at least one bottom link, wherein the carrying and drive unit is attached to the top link and bottom link via the top link and bottom link

The base frame is hinged (or: pivotally connected),

wherein the power lift has at least one electric drive to power the

Attachment included.

[0008] Unlike conventional power lifts, the power lift according to the invention therefore includes its own electric drive. The electric drive is mounted on an element of the power lift and is thus an integral part of the power lift. Since the respective implement, which is to be coupled to the vehicle via the power lift, is supplied with drive energy by this electric drive, relative movements between the implement and the vehicle no longer play a role with regard to the supply of drive energy to the implement; it only matters whether and how the relative position of the implement changes with respect to a power take-off shaft of the electric drive of the power lift. In addition, the power lift according to the invention, which can be used as a front and rear power lift, enables the use of such (driven) implements even on vehicles for which there is no corresponding

It has a power take-off.

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[0009] The power lift according to the invention can be used, in particular, as a front power lift for electric vehicles and can be designed for a lifting capacity of up to 1000 kg. The base frame can be a welded construction that serves to absorb and transmit forces. The base frame provides the connection to a vehicle frame and can include supply connections, in particular connections for hydraulics, water, and electricity (implement control, attachments). A working cylinder, for example, a hydraulic cylinder (200 bar), can be provided on the base frame for extending the lower link. The support and drive unit enables the attachment to be mounted on the power lift and the attachment to be supplied with drive energy. It can be designed by a (multi-part, in particular two-part) frame construction, which frame construction is articulated to the base frame via upper and lower links, and on which frame construction the electric drive—or its components, such as the electric motor, gearbox, and motor control—is/are mounted. The support and drive unit may also have (optionally standardized) attachment points for securing the implement to the power lift. The lower link(s) may be rigidly designed and, preferably electro-hydraulically, adjustable or pivotable on the base element to allow height adjustment of the support and drive unit; alternatively or additionally, the lower link may be mounted on the base frame in such a way that the support and drive unit is suspended from the base frame. The lower link(s) may be connected to the base frame and the support and drive unit via ball joints. The top link(s) may be length-adjustable, for example electro-hydraulically, to provide stabilization and position adjustment at a height of the implement determined by the lower link.

to enable the attachment.

[0010] According to a preferred embodiment of the invention, the support and drive unit comprises at least one base element and an attachment element detachably connected to the base element. Preferably, the electric drive is mounted on the base element, and the attachment element has mounting points for attaching the attachment to the power lift. The base element and/or the

Add-on elements can be designed in a frame-like form.

[0011] This two-part design of the support and drive unit proves advantageous, on the one hand, with regard to the mounting of the attachment to the power lift; in particular, the attachment element can be optimally designed for this purpose, for example, by having appropriate (standardized) mounting points. On the other hand

The base element can be specially designed to accommodate the electric drive and its

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Components are designed for connecting the upper and lower links, as well as for a user-friendly and detachable connection to the attachment element, adaptable to the specific application and implement used. The base element, which serves to absorb force and torque, can be made of steel and be essentially plate-shaped or have a plate-shaped section. Preferably, several screw points (through holes or threaded holes) can be provided on both sides for height-adjustable attachment of the mounting element (mounting plate) to the base element. This allows for adjustment of the working height of the respective implement. The mounting element can also be made of steel (sheet metal) and be essentially plate-shaped.

be plate-shaped or have a plate-shaped section.

[0012] According to a preferred embodiment of the invention, it is provided that

the fastening points are formed by bolts and/or elongated holes.

[0013] Preferably, the mounting element, which can generally be frame-like, can be reinforced or constructed in the area of the elongated holes (for example, by double sheet metal). Particularly preferably, the mounting element has two bolts on its upper surface for suspending the attachment and two elongated holes in a lower end face, which elongated holes are preferably accessible from one side via an edge region of the mounting element. The combination of corresponding bolts for suspension and elongated holes for fixing the attachment enables a particularly reliable, yet time-saving and safe connection.

Attachment of the attachment to the power lift according to the invention.

[0014] According to a preferred embodiment of the invention, the base element and/or the attachment element comprises or comprise fastening means to secure the attachment element at least in a first position and in a second position

to be solvably connected to the base element.

[0015] This makes it possible to precisely adjust the height of the attachment on the power lift. For example, the attachment can be operated in a first height position when the attachment element is connected to the base element in the first position, and in a second height position, which, viewed in the vertical direction, is higher than the first height position when the attachment element is connected to the base element in the second position. By providing a third and further positions in which the attachment element can be mounted on the base element of the support and drive unit, the height adjustment of the working position of the attachment can be further refined.

The attachment can be adjusted with any desired precision. This allows the power lift to be used for this purpose.

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suitable in conjunction with various attachments and in conjunction with

different vehicles.

[0016] According to a preferred embodiment of the invention, the electric drive comprises an electric motor which drives a power take-off shaft of the power lift. Preferably, the electric motor has a speed range of

It has a speed of 0-1500 revolutions per minute and can be operated in both directions of rotation.

[0017] Because the electric drive of the power lift comprises an electric motor, the power lift according to the invention, or the attachment mounted on it, can be operated extremely quietly. In conjunction with electric commercial vehicles, a particularly high efficiency can also be achieved. Furthermore, electric motors can be designed to be relatively compact, thus enabling a particularly protected housing of the electric motor on the power lift, especially in the area between the support and drive unit and the base frame, surrounded by the upper and lower links. In this way, the electric motor can be protected particularly effectively from

Protect from mechanical damage.

[0018] According to a preferred embodiment of the invention, the power take-off shaft is accessible via a front-side recess of the attachment element in order to

to enable a functional connection with the attachment.

[0019] The power take-off (PTO) shaft serves to supply the mechanical drive energy generated by the drive unit, in particular by the electric motor, to the implement. Because the PTO shaft is located on the same part of the power lift to which the implement itself is attached, a particularly simple, reliable, and efficient power transmission is ensured. The PTO shaft can be arranged completely within the power lift, in particular completely within the support and drive unit, and thus protected from unwanted external forces. The end-face recess, which according to this embodiment is provided in an end face of the support and drive unit (facing the implement during operation), allows easy access to the PTO shaft.

Establishment of the functional connection that mediates the transmission of the drive energy.

[0020] According to a preferred embodiment of the invention, the electric drive comprises a gearbox via which the electric motor is connected.

is mounted on the base element.

[0021] The power delivered via the power take-off shaft can be transferred via the transmission to the

The speed range of the electric motor can be optimized. This is particularly relevant in the case of the invention.

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The preferred speed range of 0-1500 rpm enables particularly efficient operation of the attachment. Furthermore, mounting the gearbox-motor unit on the base element allows for a particularly compact and space-saving arrangement of the electric drive components on the support and

Drive unit.

[0022] According to a preferred embodiment of the invention, the electric motor and the gearbox are provided on a side facing away from the attachment element.

are provided for in the basic element.

[0023] Thus, the electric motor-gearbox unit is located on one side of the base element, while the attachment element—and therefore also the attachment during operation—is located on the other side of the base element. The electric motor-gearbox unit and the attachment element—or also the attachment during operation—are thus separated from each other by the base element. This results in a particularly well-protected housing of the electric drive components, especially since the gearbox and electric motor are better protected from kicked-up soil and stones during operation.

etc. are protected.

[0024] According to a preferred embodiment of the invention, the electric drive includes a motor control unit, which is preferably mounted on the base element. This motor control unit can, in particular, be configured to communicate with control elements of the vehicle and/or the attachment.

communicate.

[0025] This allows for the optimization of the operating state of the attachment, the electric drive of the power lift, and/or the vehicle. By mounting the motor control unit directly on the base element, the susceptibility to failure of the electric drive is significantly reduced, since the motor control unit is thus located in the immediate vicinity of the electric motor and the transmission—i.e., the components of the electric drive to be controlled—which allows the corresponding cable connections to be kept short and at least these, preferably all, components of the electric drive to be housed on the base element, protected from damage.

for example in a common housing.

[0026] According to a preferred embodiment of the invention, the motor control is configured to control the electric drive depending on a

to regulate the vehicle's operating state. The engine control unit can do this.

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be equipped with components of the vehicle, in particular an engine control unit

of the vehicle, to communicate.

[0027] In particular, this makes it possible to operate the attachment depending on the vehicle's driving speed or other operating parameters. For example, a mower or sweeper can be operated at lower power at lower driving speeds, while the power can be increased at higher driving speeds. This embodiment improves

This improves the operating efficiency of the attachment and reduces its wear and tear.

[0028] According to a preferred embodiment of the invention, the motor control unit is configured to regulate the vehicle drive depending on the operating state of the electric drive. For this purpose, the motor control unit can be configured to communicate with components of the vehicle, in particular

to communicate with the vehicle's engine control unit.

[0029] For example, the vehicle's driving speed or other operating parameters can be controlled depending on the power consumption of the attachment. This makes it possible to control the system, including the attachment, the

To operate the power lift and the vehicle as efficiently as possible.

[0030] Furthermore, the motor control of the electric drive also enables fully automatic operation of the attachment, thereby increasing the user-friendliness of the vehicle. However, the electric drive with motor control according to the invention also already provides a basis for the use of attachments in the

A connection was established with autonomous vehicles.

[0031] According to a preferred embodiment of the invention, the base frame includes connections for supplying the attachment, in particular

Hydraulic connections, water connections and/or electrical connections.

[0032] Such connections can be supplied by the vehicle's corresponding supply lines, further increasing user-friendliness. In particular, when coupling the attachment to the vehicle using the power lift, a user (e.g., driver) can make all necessary connections (such as water and electrical connections for a sweeper) without having to interact with vehicle components other than the power lift. All required connections are provided directly on the vehicle lift. This increases handling safety.

and user-friendliness. In addition, appropriate connecting cables can be used to...

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The attachment can be kept relatively short, which increases operational safety.

[0033] According to a preferred embodiment of the invention, it is provided that at least one, preferably all, top links are designed to be length-adjustable.

or are.

[0034] In particular, electro-hydraulic length adjustment is conceivable. This allows the working position of the implement, namely with regard to a tilting position, to be set even more precisely via the top link(s). An adjustment of

The working height of the implement can be adjusted via the lower link(s).

[0035] According to a preferred embodiment of the invention, it is provided that

which at least has one lower link

a. a first section, at which first section the lower link

rotatably connected to the carrying and drive unit,

b. a second section, which second section extends tapering from the first section and at which second section the

The lower link is rotatably connected to the base frame, as well as

cC. comprises a third section, which third section extends in a direction transverse to the first section and/or the second section, projects from the first section or the second section, and on which third section the lower link is connected with an actuating element

is connected.

[0036] Thus, the third section, which preferably projects from the second section, can be used as a lever by which the actuating element, such as a hydraulic, pneumatic, or electric cylinder, can rotate the lower link to raise or lower the support and drive unit. This form of the lower link has proven to be particularly ergonomic and at the same time enables a particularly compact design of the power lift. In a two-arm design, according to which the lower link is formed by two arms running parallel to each other and connected by a cross brace, the first section has two receptacles for connecting the lower link to the support and drive unit, and the second section has two receptacles for connecting the lower link to the base frame. This two-arm design enables particularly stable and reliable guidance of the

Carrying and drive unit.

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[0037] In a preferred embodiment, the power lift comprises exactly one

Lower links of the type described above.

[0038] This allows the design of the power lift to be kept particularly simple,

At the same time, high stability and load-bearing capacity must be guaranteed.

[0039] One object of the invention is solved by a vehicle, in particular a municipal vehicle, comprising a front power lift and/or a rear power lift, wherein the front power lift and/or the rear power lift is designed by the power lift according to the invention in one of the embodiments described above.

or are.

[0040] The statements made above in connection with the power lift apply to this vehicle equipped with the power lift according to the invention.

similarly.

Brief description of the characters

[0041] The invention will now be explained in more detail with reference to the drawings. However, the following explanations are not intended to introduce the inventive concept.

To narrow down, let's summarize. It shows:

Fig. 1 shows a schematic representation of the power lift,

Fig. 2 shows another schematic representation of the power lift,

Fig. 3 shows a schematic representation of the basic frame,

Fig. 4 shows a schematic representation of the lower link,

Fig. 5 shows a schematic representation of the carrying and drive unit,

Fig. 6 shows another schematic representation of the carrying and drive unit,

Fig. 7 shows a schematic representation of the basic element of the carrying and

drive unit,

Fig. 8 shows a schematic representation of the attachment element of the support and

drive unit and

Fig. 9 shows another schematic representation of the attachment element of the support and

Drive unit.

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Ways to implement the invention

[0042] In Fig. 1 and Fig. 2, the power lift according to the invention is shown in a

Design variant shown.

[0043] The power lift initially comprises a base frame 1 (see Fig. 3), which serves to attach or mount the power lift to a vehicle, in particular a commercial vehicle, such as a municipal vehicle. A support and drive unit 2 (Figs. 5, 6, 7, 8 and 9) is articulated to the base frame 1 via a lower link 4 (see Fig. 4) and—here—two upper links 3. The support and drive unit 2 serves to support and drive an attachment, such as a sweeper, a cutter bar, a mulcher, or a snow blower. According to the invention, the power lift has at least one electric drive 5, which

electric drive 5 — here — is mounted on the carrying and drive unit 2.

[0044] The base frame 1, which is shown in detail in Fig. 3, comprises a mounting section 19, which serves to mount the base frame 1 to the respective vehicle, and a connection section 20, which has linkage mounts 21 for the top link 3 and the lower link 4. The base frame 1 also has a bracket 22 for an actuating element, which here is designed as a hydraulic cylinder 23 and which serves to actuate the lower link 4. Furthermore, recesses 24 are provided for connections for supplying the implement with electricity, water, or for supplying a hydraulic system.

Attachment provided.

[0045] The lower link 4, which serves to adjust the height of the support and drive unit 2, is shown in detail in Fig. 4. A two-armed version is shown, wherein the lower link 4 is formed by two parallel link arms 26 connected by a crossbar 25. In a first section 16 of the lower link 4, two receptacles are provided for connecting the lower link 4 to the support and drive unit 2; in a second section 17, two receptacles are provided for connecting the lower link 4 to the base frame 1. A third section 18 of the lower link 4, which here projects approximately orthogonally from the second section 17, is used as a lever by which the actuating element, designed here as a hydraulic cylinder 23, can rotate the lower link 4 about the corresponding link receptacle 21 to adjust the height of the support and drive unit.

to raise or lower.

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[0046] Figures 5 and 6 show the support and drive unit 2 in detail. The support and drive unit 2 comprises a base element 6 and an attachment element 7, wherein—here—several through-holes 27 are provided laterally on both the base element 6 and the attachment element 7 for height-adjustable, detachable fastening (e.g., screwing) of the attachment element 7 to the base element 6. Figures 5 and 6 show the support and drive unit 2 in a state in which the base element 6 and the attachment element 7 are assembled in a specific height position; fastening means (e.g., screws) passing through the through-holes 27 are not shown. The base element 6 is shown as a separate component in Figure 7; the attachment element 7 is shown separately in Figures 8 and 9.

shown — namely in a perspective view (Fig. 8) and in a front view (Fig. 9).

[0047] The mounting element 7 has attachment points 8 for attaching the attachment to the power lift. In the illustrated embodiment, these attachment points 8 are formed on the one hand by bolts 9, which project vertically in an upper circumferential region of the mounting element 7; on the other hand, further attachment points 8 are provided in a lower region of an end face of the mounting element 7, formed by elongated holes 10, which are open to a lateral circumferential region of the mounting element 7. In addition, a recess 13 is provided in the end face of the mounting element 7, through which

which recess 13 a power take-off shaft 13 of the power lift is accessible (from the outside).

[0048] The base element 6 (see also Fig. 7) has link receptacles 21 for the two upper links 3 and the lower link 4 on an inner side facing away from the attachment element 7. An electric motor 11 and a gearbox 14 are also mounted on this same inner side, with the power take-off shaft 12 serving to transmit drive energy to the attachment and, for this purpose, protruding from the gearbox 14 and through an opening in the base element 6. In a lateral circumferential area of the

Base element 6 also has a motor control unit 15 for the electric motor 11 mounted on it.

[0049] The functioning of the power lift according to the invention as described above

The described embodiment can be summarized as follows:

[0050] The power lift, which is attached to the vehicle via the base frame 1, is designed to couple and drive an implement. For this purpose, a operative connection is first established—for example, by means of a driveshaft—between the implement and the power take-off shaft 12 of the power lift, in order to supply the implement with drive energy.

To supply. Furthermore, the attachment is mounted onto the [unclear text] using bolts 9.

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Attachment element 7 is suspended and screwed to the attachment element 7 using the elongated holes 10 in order to couple the attachment to the support and drive unit 2 of the power lift. The coupling and the establishment of the functional connection can also be carried out in a single (simultaneous) operation. Prior to this, a height setting of the attachment element 7 on the base element 6 can be adjusted.

A working height of the attachment can be preset.

[0051] To raise and lower the support and drive unit 2 during vehicle operation, the lower link 4 can be rotated around the corresponding linkage mount 21 of the base frame 1 by means of the hydraulic cylinder 23. Corresponding control signals can, for example, originate from the vehicle. In this way, the working height of the attachment can be adjusted during operation. To additionally set a tilting position of the attachment, the length of the top link 3 can be varied—for example, also electro-hydraulically—which tilts the base element 6 of the support and drive unit 2 (from the vertical). Thus, the attachment element 7, which is (detachably) connected to the base element 6, also performs a corresponding tilting movement, which is then applied to the attachment 7.

attached implement transmits.

[0052] Since the drive energy for the attachment comes from the electric drive 5 provided directly on the support and drive unit 2, no relative movements occur between the attachment and the electric motor 11 during operation of the attachment, at least not to a practically relevant extent. This results in highly efficient transmission of drive energy to the attachment, especially since (particularly by adjusting the height using the attachment element 7) the angle of deflection of the shaft or drive shaft used to transmit the drive energy can be kept to a minimum, thus enabling virtually lossless transmission of drive energy to the attachment. Furthermore, extremely reliable coupling of the attachment to the (commercial) vehicle is ensured, since the shaft or drive shaft used to transmit the drive energy can be kept short and guided largely, preferably completely, within the attachment and/or the power lift, thereby reducing its susceptibility to damage from external factors.

The force applied is extremely low.

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1 Base frame 2 Carrying and drive unit

3 top links

4 lower links

5 electric drive 6 base element

7 Add-on element

8 attachment points

9 bolts 10 slotted hole 11 electric motor

12 PTO

13 recess

14 gearboxes

15 Motor control 16 First section 17 Second section 18 Third section 19 Assembly section 20 Connection section 21 Handlebar mount 22 Bracket

23 Hydraulic cylinders 24 Recesses 25 Cross brace

26 handlebar arm

27 Through hole

Reference symbol list

24041P-AT

Claims (1)

15 20 25 Ing. Johann Höllwart 14/17 24041P-AT 1. Patent claims Power lift for a vehicle, comprising at least a. a base frame (1) for attaching the power lift to the vehicle, b. a carrying and drive unit (2) for carrying and driving a attachment, as well as C. at least one top link (3) and at least one lower link (4), wherein the carrying and drive unit (2) is connected via top link (3) and lower link (4) is attached to the base frame (1), wherein the power lift has at least one electric drive (5) to drive the Attachment included. Power lift according to claim 1, characterized in that the support and drive unit (2) comprises at least one base element (6) and an attachment element (7) detachably connected to the base element (6), wherein the electric drive (5) is mounted on the base element (6) and wherein the attachment element (7) has attachment points (8) for attaching the attachment to the power lift. exhibits. Power lift according to claim 2, characterized in that the attachment points (8) are formed by bolts (9) and/or elongated holes (10). Power lift according to one of claims 2 or 3, characterized in that the base element (6) and/or the attachment element (7) comprises fastening means to secure the attachment element (7) at least in a first position and in a to connect the second position solvably with the base element (6). Power lift according to one of claims 1 to 4, characterized in that the electric drive (5) comprises an electric motor (11) which electric motor (11) drives a power take-off shaft (12) of the power lift. Power lift according to claim 5, characterized in that the power take-off shaft (12) is accessible via an end-face recess (13) of the attachment element (7) in order to To enable a functional connection with the attachment. 15 20 25 30 Ing. Johann Höllwart 15/17 24041P-AT 10. 11. 12. 13. 14. Power lift according to one of claims 5 or 6, characterized in that the electric drive (5) comprises a transmission (14) via which transmission (14) the electric motor (11) is mounted on the base element (6). Power lift according to claim 7, characterized in that the electric motor (11) and the gearbox (14) are located on a side of the attachment element (7) facing away from the attachment element. basic element (6) are provided. Power lift according to one of claims 1 to 8, characterized in that the electric drive (5) comprises a motor control (15) which motor control (15) is preferably mounted on the base element (6). Power lift according to claim 9, characterized in that the motor control (15) is configured to control the electric drive (5) depending on a To regulate the vehicle's operating condition. Power lift according to one of claims 9 or 10, characterized in that the motor control (15) is configured to drive the vehicle in to control the dependence of an operating state of the electric drive (5). Power lift according to one of claims 1 to 11, characterized in that the base frame (1) includes connections for supplying the attachment, in particular hydraulic connections, water connections and/or electrical connections. Power lift according to one of claims 1 to 12, characterized in that at least one, preferably all, top links (3) are length-adjustable trained(s). Power lift according to one of claims 1 to 13, characterized in that the at least one lower link (4) at least a. a first section (16), at which first section (16) the The lower link (4) is rotatably connected to the carrying and drive unit (2), b. a second section (17), which second section (17) extends tapering from the first section (16) and on which second section (17) the lower link (4) is rotatably connected to the base frame (1), as well as cC. includes a third section (18), which third section (18) is divided into a perpendicular to the first section (16) and/or to the second section (17) extending in the direction from which the lower link (4) extends from the first section (16) or from the second section (17) and at which third section (18) the lower link (4) is connected with an actuating element, in particular with a hydraulic cylinder (23), is connected. 5 15. Vehicle, in particular municipal vehicle, comprising a front linkage and/or a rear linkage, wherein the front linkage and/or the rear linkage is designed by the linkage according to one of claims 1 to 14 is or are.