Hydraulic car jack

Abstract

The invention relates to a hydraulically actuated vehicle jack (1), comprising a lifting support (3) which can be pivoted about a horizontal axis (2) and moved from a lower starting position (A) into an upwardly pivoted lifting position (H), a support plate (5) arranged on the lifting support (3) for supporting a part of a vehicle to be lifted, a hydraulic cylinder (4), the actuation of which causes a pivoting movement of the lifting support (3), a pump unit (6) for actuating the hydraulic cylinder (4), and at least one rolling element (9) for rolling the vehicle jack (1) to a desired work site for lifting a vehicle, wherein the vehicle jack (1) has a rigid base structure (10) which rests on the ground (U) at the work site when a vehicle is being lifted and prevents lateral movements of the vehicle jack (1).

Description

[0001] The present invention relates to a hydraulically operated car jack according to the preamble of claim 1. This car jack comprises a lifting support pivotable about a horizontal axis, which can be moved from a lower starting position into an upwardly pivoted lifting position for lifting a vehicle, and a support region arranged on the lifting support, in particular a support plate for supporting a part of a vehicle to be lifted, such as the body, the chassis, or the frame structure of the vehicle. Furthermore, the car jack comprises a hydraulic cylinder with a cylinder housing and a piston slidably received therein and connected to a piston rod, wherein the hydraulic cylinder or the piston rod is operatively connected to the lifting support in such a way that actuation of the hydraulic cylinder, i.e., displacement of the piston and thus of the piston rod relative to the cylinder housing, causes a pivoting movement of the lifting support.In addition, the jack comprises a pump unit hydraulically connected to the hydraulic cylinder for actuating the hydraulic cylinder, as well as at least one rolling element, for example a pair of rollers or a roller, over which the jack can be driven or rolled to a desired work location for lifting a vehicle.

[0002] Such hydraulically operated jacks are commonly used for the controlled raising and lowering of a vehicle, such as a passenger car or motorhome. They are used in both private and commercial settings, particularly when changing vehicle wheels.

[0003] The trolley jack design is particularly widespread, as it offers increased maneuverability thanks to multiple rolling elements, some of which can also pivot around a vertical axis. For maneuvering, trolley jacks typically feature an elongated operating lever that, in addition to its function as a steering lever, can also serve as a pump lever for operating a hydraulic cylinder and a connected jack support. Such a hydraulic trolley jack is known, for example, from DE 10 2019 121 343 B3.

[0004] From DE 20 2007 002 358 U1, a hydraulically operated trolley jack is known in which the operating lever can also be pivoted to one side about a vertical pivot axis in order to enable use even in confined spaces.

[0005] A hydraulic trolley jack with a double piston pump is known from DE 20 2009 018 187 U1.

[0006] Since the support plate or support area located at the free end of the jack support moves in a circular arc when the jack support is pivoted upwards, the entire jack performs a lateral compensating movement during the jack support's lifting movement, causing the jack to roll to one side in its longitudinal direction on its rolling elements. This lateral forward or backward movement of the jack can compromise safety when lifting a vehicle.

[0007] The object of the present invention is to provide a structurally simple hydraulically operated car jack of the type mentioned above, which is easy to handle despite its compact design and offers increased safety.

[0008] This object is achieved according to the invention by a hydraulically operated car jack according to claim 1. Advantageous embodiments and expedient further developments of the invention emerge from the dependent claims.

[0009] The solution according to the invention provides that the jack has a rigid base structure that rests on the ground when raising and lowering a vehicle at the work site. This rigid base structure reliably prevents lateral movement of the jack relative to the ground in all directions during the lifting movement. This rigid base structure of the jack remains immobile on the ground throughout the entire lifting process.

[0010] A significant advantage is that, due to the elimination of lateral compensating movement, the jack offers significantly greater safety when lifting a vehicle.

[0011] The jack according to the invention is simple in design, inexpensive to manufacture, and easy to handle. Furthermore, it features a very compact construction, with a particularly low height in the lowered starting position, allowing the jack to be used even on very low-slung vehicles. Nevertheless, the jack can also achieve great lifting heights.

[0012] It is particularly advantageous if the jack support has a support area located at an end region of the jack support remote from or facing away from the support plate, and which can be displaced on or at the floor structure along a guideway. Advantageously, a horizontal axis is located in the support area, around which the jack support can be pivoted up and down.

[0013] It is also particularly advantageous if the car jack has at least one connecting strut, which is pivotally connected, on the one hand, to a first pivot point located on the floor structure and directly or indirectly firmly connected thereto, and, on the other hand, to a second pivot point located between the support plate and the support area in a central region on the jack support and directly or indirectly firmly connected thereto. For the purposes of the present patent application, the articulation of a first element to a second element means that the two elements are pivotally connected to one another, whereby the pivotal connection can be implemented directly or indirectly via interposed elements.

[0014] It is also particularly advantageous if the at least one rolling element is arranged and mounted on the support area of ​​the lifting support and if, in the lower starting position of the lifting support, it projects laterally beyond the ground structure. In this way, the at least one rolling element can be brought into contact with the ground when the car jack is lifted at the end area opposite the rolling element, preferably using a handle provided for this purpose. In this way, the car jack, which has been lifted on one side, can be easily moved and rolled to a desired work location for lifting a vehicle. As soon as the car jack is put down at the work location again, the at least one rolling element loses its contact with the ground, so that the car jack rests immovably on the ground via its rigid base structure.

[0015] It is particularly advantageous if the at least one rolling element rolls on the upper side of the floor structure when the jack is pivoted up into a lifting position, with the upper side of the floor structure thus forming a straight guide track for the support area of ​​the jack. In this way, the at least one rolling element can perform two functions at once: firstly, it enables the jack to roll to a desired work location before a vehicle is lifted, and secondly, when the jack is in operation and lifting a vehicle, it guides the support area of ​​the jack along the guide track formed by the upper side of the floor structure. During the lifting process, the support forces exerted by the lifted vehicle on the jack are transferred to the ground via the floor structure. Lateral transverse forces acting laterally during the lifting process can also be absorbed by the guide track.

[0016] According to a particularly preferred embodiment of the invention, the hydraulic cylinder is rigidly connected to the floor structure. The cylinder housing is immobile and positionally stable, i.e., it is attached to the floor structure in a manner that prevents rotation, pivoting, or translation. This results in a particularly simple construction. In this case, the first pivot point of the connecting strut can advantageously be arranged on a pivot element that is integrally formed with the cylinder housing or on a pivot element that is firmly connected to the cylinder housing.

[0017] It is particularly advantageous if the longitudinal direction of the hydraulic cylinder, which is defined by the longitudinal direction of the piston rod of the hydraulic cylinder, is aligned along the linear guideway for the support area of ​​the jack support or parallel to this guideway. The hydraulic cylinder preferably extends parallel to the top side of the floor structure so that the piston rod can be retracted and extended parallel to the top side of the floor structure. The hydraulic cylinder is thus arranged horizontally and remains unchanged in this horizontal orientation even during the lifting process.

[0018] According to a particularly preferred embodiment of the invention, it is provided that the hydraulic cylinder is designed to be double-acting and the free end of the piston rod is articulated on the support region of the lifting support, preferably on the axis of the at least one rolling element.

[0019] The lifting support can advantageously be raised from the lower starting position into an upwardly pivoted lifting position by retracting the piston rod into the cylinder housing and can be lowered from an upwardly pivoted lifting position into the lower starting position by extending the piston rod from the cylinder housing.

[0020] It is particularly advantageous if at least one check valve or safety valve is integrated into the hydraulic cylinder or a connected valve block, preventing the piston rod from accidentally extending from the hydraulic cylinder. This prevents the jack from accidentally lowering from an upwardly pivoted lifting position to the lower starting position.

[0021] According to a particularly preferred embodiment of the invention, a locking element is arranged on the support area of ​​the jack support, preferably in the region of the axis of the at least one rolling element. This locking element can interact positively with locking catches or with a rack structure formed on the floor structure. This provides additional mechanical security against unintentional lowering of the jack support.

[0022] It is particularly advantageous if the locking element is pressed against the locking detents or the rack structure by a spring load, and if it can be disengaged from the locking detents or the rack structure by a release element, preferably a Bowden cable or an electromagnetic actuator, thus allowing the jack to pivot downwards into its original position. The locking element can preferably be formed by a spring-loaded pawl.

[0023] According to another particularly preferred embodiment of the invention, the lifting support is formed by two lifting arms located on either side of the hydraulic cylinder, which are rigidly connected to each other, i.e., not movable relative to each other, and thus can only be moved together. The hydraulic cylinder is thus located between the two lifting arms.

[0024] It is particularly advantageous if the car jack also has two connecting struts located on both sides next to the hydraulic cylinder, which are each pivotably connected on the one hand to a first pivot point located on the floor structure and directly or indirectly firmly connected thereto, and on the other hand to a second pivot point located on one of the two lifting arms and directly or indirectly firmly connected thereto.

[0025] A particularly compact design of the jack can be achieved by forming the base structure with a plate that forms a common or separate guideway on its upper side for each rolling element.

[0026] According to a particularly preferred embodiment of the invention, the car jack comprises a parallel arm or two parallel arms each assigned to a lifting arm, which is or are articulated on the one hand in the region of its free end to the piston rod and on the other hand to the support plate in such a way that the parallel arm or the parallel arms together with the lifting support or with the two lifting arms forming the lifting support form or form a parallelogram arrangement in a manner known per se and thus hold or hold the support plate parallel to the ground structure, preferably horizontally aligned, at any lifting height.

[0027] According to a further particularly preferred embodiment of the invention, it is provided that the jack comprises an electric motor by which the pump unit for actuating the hydraulic cylinder can be driven.

[0028] Advantageously, at least one preferably replaceable battery can be arranged on the jack to supply energy to the electric motor.

[0029] It is also particularly advantageous if the pump unit is a reversing unit driven by an electric motor. This eliminates the need for directional control valves to control the hydraulic cylinder.

[0030] It is particularly advantageous if the reversing unit is positioned directly next to the hydraulic cylinder and connected directly to the hydraulic cylinder or to a valve block connected to the hydraulic cylinder without any hoses or pipes. This eliminates the need for additional hydraulic lines, which could pose a risk of damage or leaks, and results in a particularly compact, simple, and safe design.

[0031] According to a particularly preferred embodiment of the invention, the jack comprises a control unit electrically connected to the electric motor, by which the electric motor can be controlled to operate the jack. The control unit, in turn, can advantageously be connected to a control panel comprising operating elements such as switches, via which the jack can be manually operated.

[0032] It is particularly advantageous if the control unit is connected to a receiver via which the jack can be operated remotely using a control unit, either wired or wirelessly.

[0033] The present invention further relates to an arrangement of two or more jacks of the latter type, in which the control units of the individual jacks are connected to each other via cable or wirelessly via radio or WLAN. The control units of the jacks can thus communicate with each other.

[0034] In such an arrangement of at least two jacks, it is particularly advantageous if the control unit of one of the jacks, which acts as the master jack, is connected to a receiver via which all jacks can be remotely controlled, either wired or wirelessly, using a control unit. The other jacks act as slave jacks.

[0035] According to a particularly preferred embodiment of this arrangement of at least two car jacks, the control unit of the master car jack is connected to at least one inclination sensor that can be detachably attached to a vehicle to be lifted. All of the interconnected jacks are controlled via the control unit of the master car jack based on the data available from the at least one inclination sensor to achieve a desired alignment or leveling of the vehicle. The at least one inclination sensor supplies data on the current inclination of the vehicle to the control unit of the master car jack, which uses this data to determine corresponding data for controlling the other jacks to achieve a desired alignment or leveling of the vehicle.In an arrangement of three or four jacks, the control unit of the master jack can advantageously be connected to two tilt sensors, which can be removably attached to a vehicle to be lifted at an angle of preferably 90° to each other. A method that can be advantageously used in this case is described, for example, in patent DE 10 2019 002 237 B4.

[0036] Further advantages and features of the invention will become apparent from the following description and the embodiment shown in the drawings.

[0037] They show: Fig. 1: a perspective view of a car jack according to the invention from a first direction, Fig. 2: a perspective view of the jack from Fig. 1 from a second direction, Fig. 3: a side view of the jack from Fig. 1 from direction I in Fig. 1, Fig. 4: a side view of the jack from Fig. 1 from direction II in Fig. 2, Fig. 5: a side view of the jack from Fig. 4 in the lower starting position, Fig. 6: an enlarged sectional view of the locking element in the locking position, and Fig. 7: the locking element from Fig. 6 in the release position.

[0038] The hydraulically operated jack 1 shown in the figures is used for the selective raising and controlled lowering of a section of a vehicle, such as a passenger car or mobile home. Depending on its size, it can also be used for larger vehicles such as buses or trucks.

[0039] The jack 1 comprises a lifting support 3 which can be pivoted about a horizontal axis 2 and which is moved by means of a hydraulic cylinder 4 from a lower starting position A ( Fig. 5) into an upper lifting position H ( Fig. 1 to 4) can be pivoted upwards. At the upper end of the jack support 3 in the lifting position H, a support plate 5 is hinged, which forms the contact point for the part of the vehicle to be lifted, which part can be formed, for example, by part of the chassis or part of the frame structure of the vehicle. To actuate the hydraulic cylinder 4 and thus also to actuate the jack support 3 operatively connected thereto, a pump unit 6 is provided on the vehicle jack 1 which is hydraulically connected to the hydraulic cylinder 4 and, in the exemplary embodiment shown here, is formed by a reversing unit driven by an electric motor 7 connected to a control unit not shown in detail here. Depending on the direction of rotation of the electric motor 7, the jack support 3 can thus be raised to the lifting position H or lowered to the starting position A.As an alternative to a reversible hydraulic unit, a non-reversible hydraulic unit can also be used, which is connected to corresponding control valves, which can then also be operated by the control unit.

[0040] In the illustrated embodiment, the lifting support 3 consists of two lifting arms 3a, which are arranged on either side of the hydraulic cylinder 4 and each comprise a lower partial arm 3b and an upper partial arm 3c. The two approximately equally long partial arms 3b and 3c are arranged laterally offset from one another and are connected to one another in a rotationally fixed manner centrally via a connecting element 3d with an approximately semicircular cross-section.

[0041] At the lower end of the lifting support 3 in the lifting position H, which is opposite the support plate 5, a support area 8 forms. A rolling element 9, formed here by two rollers 9a, is mounted in this support area 8. The two rollers 9a, or the rolling element 9 formed by them, is mounted on the axis 2, which firmly connects the two lifting arms 3a to one another and simultaneously forms the horizontal axis 2 about which the lifting support 3 can be pivoted.

[0042] According to the invention, the car jack 1 comprises a rigid base structure 10, which here is formed by an elongated base plate 10a. When the car jack 1 is used, i.e. when raising and lowering a vehicle, this base structure 10 rests flat on the ground U at the work site, so that lateral movements of the car jack 1 relative to the ground in all directions are reliably excluded due to the frictional forces acting between the base structure 10 and the ground U during use. By means of a suitably roughened surface structure on the underside of the base structure 10, the frictional forces preventing lateral movement of the car jack 1 and thus also the operational reliability of the car jack 1 can be further increased. The base structure 10 of the car jack 1 remains immobile on the ground U during the entire lifting process.

[0043] On the upper side of the base plate 10a forming the rigid floor structure 10, there is a housing 11, which houses, among other components, the pump unit 6 and the electric motor 7, as well as a control unit controlling the electric motor 7 and a replaceable battery for supplying power to the electric motor 7 and the control unit. The entire jack 1 thus forms a self-contained unit that can be motorized without additional power connections such as hydraulic, pneumatic, or electrical lines.

[0044] Furthermore, the double-acting hydraulic cylinder 4, here designed as a double-acting cylinder, is rigidly and immovably mounted with its cylinder housing on top of the base plate 10a. The base of the cylinder housing opposite the piston rod 12, which contains the two pressure ports of the hydraulic cylinder 4 and a safety valve, extends into the housing 11. In the housing 11, the base of the hydraulic cylinder 4 is located directly next to the reversing unit forming the pump unit 6, where the latter is connected directly to the pressure ports of the hydraulic cylinder 4 or to a valve block of the hydraulic cylinder 4 without any intermediate hoses or pipes.

[0045] At the end of the base plate 10a facing away from the housing 11, two guide tracks 13 are formed on the upper side, in and on each of which a roller 9a of the rolling element 9 can roll. The two guide tracks 13 are separated from one another by a ladder-shaped rack structure 14 located between them. When rolling, the two rollers 9a of the rolling element 9 are guided in and on the two guide tracks 13. At the same time, the rollers 9a also support the support area 8 of the lifting support 3, so that the weight forces acting when lifting a vehicle are absorbed by the rollers 9a of the rolling element 9 and the floor structure 10 from the ground U. The two lifting arms 3a are firmly connected to one another by the axle 2, which is arranged in the section of the lower partial arms 3b forming the support area 8.

[0046] In addition, on the top side of the base plate 10a, on both sides of the hydraulic cylinder 4, there is a fixed first pivot point 15 for each connecting strut 16. Two connecting struts 16 are provided, each pivoted at one end to one of the two first pivot points 15 and at the other end via a second pivot point 17 to an approximately central region of the two lifting arms 3a. The two second pivot points 17 are located on an axis 18, via which the two lifting arms 3a are also connected to one another. The axis 18 is surrounded on both sides by one of the two connecting elements 3d, which respectively connect the two partial arms 3b and 3c of the two lifting arms 3a.

[0047] The piston rod 12 of the hydraulic cylinder 4 extends parallel to the two guideways 13. The free end of the piston rod 12 is connected to the axle 2 by means of a bearing bush 19 formed thereon, on which the two rollers 9a are also mounted. When the piston rod 12 is in its maximum extended position, the lifting support 3 is in the lower starting position A ( Fig. 5). As the piston rod 12 is increasingly retracted into the housing of the hydraulic cylinder 4, which is immovably connected to the floor structure 10, the support area 8 of the lifting support 3 increasingly approaches the housing of the hydraulic cylinder 4 as the rollers 9a roll on the guideways 13, whereby the leverage effect of the two connecting struts 16 results in an increasing uprighting of the lifting support 3 toward the upper lifting position H. The support plate 5 thereby performs an at least almost exactly vertical lifting movement.

[0048] Since an additional parallel arm 20 is arranged parallel to each of the two lifting arms 3a, the support plate 5 always remains in its horizontal orientation throughout the entire lifting movement. The parallel arms 20 are articulated on the piston rod 12 at a distance from the axis 2 in the area of ​​the free end of the piston rod 12, and on the other hand, they are articulated on the support plate 5 at an equal distance from the support plate 5's bearing on the lifting support 3. Thus, the two parallel arms 20, together with the two lifting arms 3a, each form a parallelogram arrangement that keeps the support plate 5 aligned parallel to the base plate 10a at every lifting height.

[0049] As an additional safety device to prevent the lifting support 3 from being lowered inadvertently, a pivotably mounted locking element 21 is arranged at the free end of the piston rod 12. In the illustrated embodiment, it is designed as a pawl with a locking lug 22, which is pressed into the gaps 14a of the rack structure 14 by a spring element (not shown in detail), such as a leg spring, in a form-fitting manner, in order to block any unintentional movement of the support area 8 away from the housing of the hydraulic cylinder and thus any unintentional lowering of the lifting support 3. Alternatively, the locking element 21 can also be arranged on the support area 8 of the lifting support 3.

[0050] However, to enable the desired lowering of the lifting support 3, a release element (not shown here) is also provided, by which the locking lug 22 can be pivoted out of the gaps in the rack structure 14 against the spring load, thus enabling an unblocked movement of the support area 8 in the direction causing the lowering of the lifting support 3. The release element can be formed mechanically, for example, by a Bowden cable guided from the housing 11 via the axis 18 or, preferably, by an electromagnetic actuator.

[0051] As long as the support 3 is in the lower starting position A ( Fig.5), the two rollers 9a extend beyond the end of the base plate 10a, where they are freely rotatable. In this way, the rollers 9a can be brought into contact with the ground U by lifting the opposite side of the jack 1, which can preferably be done via a handle 23 arranged on the base plate 10a or on the housing 11, so that the jack, raised on one side, can be easily moved and rolled to a desired location for lifting a vehicle. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2019 121 343 B3

[0003] DE 20 2007 002 358 U1

[0004] DE 20 2009 018 187 U1

[0005] DE 10 2019 002 237 B4

[0035]

Claims

[1] Hydraulically operated jack (1), comprising - a lifting support (3) that can be pivoted about a horizontal axis (2) and moved from a lower starting position (A) to an upwardly pivoted lifting position (H), - a support plate (5) arranged on the lifting support (3) for supporting a part of a vehicle to be lifted, - a hydraulic cylinder (4) whose actuation causes a pivoting movement of the lifting support (3), - a pump unit (6) for actuating the hydraulic cylinder (4), - at least one rolling element (9) for rolling the jack (1) to a work location desired for lifting a vehicle, characterized by , that the jack (1) has a rigid base structure (10) which rests on the ground (U) when lifting a vehicle at the work site and prevents lateral movements of the jack (1). [2] Car jack (1) according to claim 1, characterized by, that the lifting support (3) has a support area (8) facing away from the support plate (5), which can be moved on or along the floor structure (10) along a guide track (13). [3] Jack (1) according to claim 2, characterized by that it has at least one connecting strut (16) which is pivotably connected on the one hand to a first pivot point (15) located on the ground structure (10) and on the other hand to a second pivot point (17) located between the support plate (5) and the support area (8) on the lifting support (3). [4] Jack (1) according to claim 2 or 3, characterized by , that at least one rolling element (9) is mounted on the support area (8) of the lifting support (3) and extends laterally beyond the floor structure (10) in the lower starting position (A) of the lifting support (3). [5] Jack (1) according to claim 4, characterized by, that the at least one rolling element (9) rolls on the upper surface of the floor structure (10) forming the guide track (13) when the lifting support (3) is swung upwards. [6] Car jack (1) according to any of the preceding claims, characterized by , that the cylinder housing of the hydraulic cylinder (4) is rigidly connected to the floor structure (10). [7] Jack (1) according to claims 2 and 6, characterized by , that the guide track (13) for the support area (8) of the lifting support (3) is designed to be straight and the piston rod (12) of the hydraulic cylinder (4) is aligned along the guide track (13) or parallel to it. [8] Jack (1) according to claim 7, characterized by , that the hydraulic cylinder (4) is designed to be double-acting, and that the free end of the piston rod (12) is articulated to the support area (8) of the lifting support (3), preferably to the axis (2) of the at least one rolling element (9), on the lifting support (3). [9] Jack (1) according to claim 8, characterized by , that the lifting support (3) can be moved from the lower starting position (A) to an upwardly pivoted lifting position (H) by retracting the piston rod (12) into the cylinder housing, and that the lifting support (3) can be moved from an upwardly pivoted lifting position (H) to the lower starting position (A) by extending the piston rod (12) out of the cylinder housing. [10] Jack (1) according to claim 9, characterized by , that at least one shut-off valve or safety valve is integrated into the hydraulic cylinder (4) or into a valve block connected to the hydraulic cylinder (4) which prevents the piston rod (12) from being unintentionally extended out of the hydraulic cylinder (4). [11] Car jack (1) according to any of the preceding claims, characterized by, that a locking element (21) is arranged on the support area (8) of the lifting support (3), preferably in the area of ​​the axis (2) of the at least one roller element (9), which can interact positively with locking detents (14a) provided on the floor structure (10). [12] Jack (1) according to claim 11, characterized by , that the locking element (21) is spring-loaded and pressed against the locking detents (14a), and that it can be disengaged from the locking detents (14a) by a release element, preferably by a Bowden cable or by an electromagnetic actuator. [13] Car jack (1) according to any of the preceding claims, characterized by , that the lifting support (3) is formed by two lifting arms (3a) located on both sides next to the hydraulic cylinder (4), which are firmly connected to each other. [14] Jack (1) according to claim 13, characterized by, that it has two connecting struts (16) located on both sides next to the hydraulic cylinder (4), each of which is pivotably connected on one side to a first pivot point (15) located on the floor structure (10) and on the other side to a second pivot point (17) located on a lifting arm (3a). [15] Car jack (1) according to any of the preceding claims, characterized by , that the floor structure (10) is formed by a floor plate (10a) which forms a guide track (13) on its upper side for each roller element (9). [16] Car jack (1) according to any of the preceding claims, characterized by that it comprises at least one parallel arm (20) which is articulated to the piston rod (12) and to the support plate (5) in such a way that it forms a parallelogram arrangement with the lifting support (3) and keeps the support plate (5) aligned parallel to the floor structure (10) at every lifting height. [17] Car jack (1) according to any of the preceding claims, characterized by, that it includes an electric motor (7) by which the pump unit (6) can be driven. [18] Jack (1) according to claim 17, characterized by , that it comprises at least one preferably replaceable battery for supplying energy to the electric motor (7). [19] Jack (1) according to claim 17 or 18, characterized by , that the pump unit (6) is formed by a reversing unit. [20] Jack (1) according to claim 19, characterized by , that the reversing unit is arranged directly next to the hydraulic cylinder (4) and is connected without cables directly to the hydraulic cylinder (4) or to a valve block of the hydraulic cylinder (4). [21] Jack (1) according to any one of claims 17 to 20, characterized by , that it includes a control unit connected to the electric motor (7) by which the electric motor (7) can be controlled to operate the jack (1). [22] Jack (1) according to claim 21, characterized by, that the control unit is connected to a receiver via which the jack (1) can be operated remotely by means of a control unit, either wired or wirelessly. [23] Arrangement of at least two jacks (1) according to claim 21 or 22, characterized by , that the control units of the jacks (1) are connected to each other via a cable or wirelessly via radio or WLAN. [24] Arrangement of at least two jacks (1) according to claim 23, characterized by , that the control unit of one of the jacks (1), which acts as the master jack, is connected to a receiver, via which all jacks (1) can be operated remotely by means of a control unit, either wired or wirelessly. [25] Arrangement of at least two jacks (1) according to claim 24, characterized by, that the control unit of the master jack is connected to at least one tilt sensor which can be detachably attached to a vehicle to be lifted, wherein all jacks (1) can be controlled via the control unit of the master jack to achieve a desired alignment or leveling of the vehicle on the basis of the data obtainable from the at least one tilt sensor.

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