Drive device for moving a closure element of a motor vehicle

Abstract

Drive device for moving a closure element of a motor vehicle relative to a main body, comprising an outer tube with a longitudinal axis, which is connected to the main body, an inner element, which is arranged in the outer tube and is connected to the closure element, a helical compression spring, which is arranged between the inner element and the outer tube, and an inner guide element, which is arranged between the inner element and the outer tube and is axially fixed to the inner element, for inner guiding of the inner guide end. The inner element is extendable from the outer tube along the longitudinal axis. When the inner element is pulled out of the outer tube, the helical compression spring is compressed against the spring tension. The drive device comprises an outer guide element, which is arranged between the outer tube and the helical compression spring and is axially fixed to the outer tube, for outer guiding of the outer guide end of the helical compression spring opposite the outer guide end. In at least one movement state of the inner element relative to the outer tube, the outer guide end is guided exclusively by the outer guide element and the inner guide end is guided exclusively by the inner guide element.

Description

TECHNICAL FIELD

[0001] The present invention relates to a drive device for moving a closure element of a motor vehicle. BACKGROUND

[0002] Contradictory designs of spindle drives (equipped with helical compression spring-loaded tension load spindle drives) tend to produce noise in the spring guide system. This effect is amplified when springs with a higher spring force are used. In addition, this effect depends on wear.

[0003] Contradictory designs of spindle drives are known, for example, from the patent publications DE 10 2017 117 993 A1, DE 10 2018 121 033 A1, DE 10 2012 100 220 A1, EP 2 199 513 A1 and WO 2019 / 007583 A1, which are characterized as follows:

[0004] The spindle drive is subjected to tensile loading. The design includes the use of a helical compression spring, wherein the direction of action of the spring force is reversed using two coupling elements. The outer coupling element is referred to as the spring housing tube or outer tube and has a guide bushing as a terminal, which is directly connected to the spring housing tube. The guide bushing serves to transmit the spring force to the spring housing tube.

[0005] The inner coupling element is referred to as the spring guide or inner guide element and passes completely through the helical compression spring and indirectly transmits the spring force to the ball seat for connecting the spindle drive to the motor vehicle body.

[0006] According to the design of the spindle drive, the helical compression spring is guided completely and exclusively by the inner spring guide or by the inner spring guide and the spring housing tube (DE 10 2012 221 645 A1).

[0007] Compared to systems with tension spring spindle drives, which, like the spindle drive, are subjected to tensile loading, the contradictory spindle drive can be manufactured with a smaller outer diameter and a lighter weight. However, for this the spindle drive must accept a greater overall length.

[0008] Test results show that the contradictory system is susceptible to noise produced in the spring guide system. This effect is amplified with increasing spring force.

[0009] Even with the help of customary optimization attempts (different greases or different surface structures of the guide), the noise cannot be eliminated. SUMMARY

[0010] It is an object of the present invention to provide a cost-effective drive for moving a closure element of a motor vehicle, which works more quietly and wears less than known spindle drives according to the prior art.

[0011] The drive according to the invention solves the technical problem.

[0012] The invention relates to a drive for moving a closure element, in particular a door or a luggage compartment cover, of a motor vehicle, in particular a passenger car, relative to a main body of the motor vehicle.

[0013] The drive comprises an outer tube having a longitudinal axis for connection to the main body or the closure element and an inner element at least partially arranged in the outer tube for connection to the other of the main body and the closure element. The connection can be realized, for example, by ball sockets connected to each of the outer tube and the inner element, which are connected to ball head pins complementary to ball sockets on the main body and the closure element.

[0014] The outer tube and / or the inner element can be substantially cylindrical in shape. The inner element can be hollow or filled. The inner element is preferably arranged coaxially to the longitudinal axis.

[0015] The drive comprises a helical compression spring arranged radially between the inner element and the outer tube relative to the longitudinal axis and an inner guide element arranged radially between the inner element and the helical compression spring relative to the longitudinal axis and axially fixed to the inner element for inner guiding of an inner guide end of the helical compression spring along the longitudinal axis.

[0016] Two components are axially fixed to each other if they are fixed at least against axial displacement relative to each other along the longitudinal axis. In any case, the components can be rotated relative to each other about the longitudinal axis.

[0017] The inner element is telescopically extendable out of the outer tube along the longitudinal axis. By this displacement of the inner element relative to the outer tube, the drive is able to drive a movement of the closure element relative to the main body.

[0018] The helical compression spring is clamped between the inner element and the outer tube in such a way that the helical compression spring is compressed against the spring tension of the helical compression spring when the inner element is pulled out of the outer tube.

[0019] If the drive is connected to the main body and the closure element in such a way that the inner element is pulled out of the outer tube during a closing movement of the closure element, the spring tension of the helical compression spring thus drives or supports the opening movement of the closure element, for example against the weight of the closure element.

[0020] The drive device can comprise an electromechanical drive unit for displacing the inner element along the longitudinal axis relative to the outer tube. The drive unit can comprise, inter alia, an electric motor and a threaded spindle driven thereby. In this case, the drive device is a spindle drive according to the above-mentioned contradiction.

[0021] The drive device comprises an outer guide element which is arranged radially between the outer tube and the helical compression spring relative to the longitudinal axis and is axially fixed to the outer tube for the outer guidance of the outer guide end of the helical compression spring along the longitudinal axis opposite the inner guide end along the longitudinal axis.

[0022] The terms "end" and "end portion" refer to the end of a component along the longitudinal axis.

[0023] The outer guide end of the helical compression spring is preferably supported on the outer tube along the longitudinal axis, in particular via the outer guide element. The inner guide end of the helical compression spring is preferably supported on the inner element along the longitudinal axis, in particular via the inner guide element.

[0024] If the ends of the helical compression spring are supported by guide elements on the outer tube and / or the inner element, the resulting advantage is that the guide elements can be axially fixed to the outer tube and / or the inner element by the spring force of the helical compression spring.

[0025] In at least one movement state of the inner element relative to the outer tube, the outer guide end of the helical compression spring is guided only by the outer guide element, and in said at least one movement state, the inner guide end of the helical compression spring is guided only by the inner guide element. In particular, in said at least one movement state, the outer guide end is not guided by the inner guide element, and the inner guide end is not guided by the outer guide element.

[0026] As a result of the outer guide end of the helical compression spring being supported by the outer guide element, the relative speed of the helical compression spring relative to the outer guide element increases from the outer guide end to the inner guide end of the helical compression spring when the inner element is moved relative to the outer tube. The minimum relative speed between the helical compression spring and the outer guide element is therefore at the outer guide end of the helical compression spring.

[0027] As a result, the relative speed of the helical compression spring relative to the inner guide element increases from the inner guide end to the outer guide end of the helical compression spring when the inner element is moved relative to the outer tube, since the inner guide end is supported by the inner guide element. The minimum relative speed between the helical compression spring and the inner guide element is therefore at the inner guide end of the helical compression spring.

[0028] The fact that the outer guiding end of the helical compression spring is guided only by the outer guiding element and the inner guiding end of the helical compression spring is guided only by the inner guiding element, compared to both ends being guided by the outer guiding element and / or both ends being guided by the inner guiding element, achieves a lower relative speed between the end of the helical compression spring and the guiding element.

[0029] The lower relative speed between the end of the helical compression spring and the guiding element compared to previously known drive systems leads to a lower frictional power, which leads to a lower noise generation and wear.

[0030] Since the lateral force transmitted from the helical compression spring to the guiding element is proportional to the axial force acting on the helical compression spring, the reduced frictional power according to the invention is particularly advantageous for drive devices that have to exert high axial forces, for example to drive heavy tailgates of luxury cars.

[0031] The reduced frictional power of the drive device can also have the effect that, by appropriate material selection and design of the guiding element, the lubrication of the contact surfaces of the helical compression spring and the guiding element with grease or oil can be reduced or even completely dispensed with.

[0032] As a result, a leakage of oil or grease from the drive device is less likely to occur or even completely ruled out. Thus, the risk of pollution of the environment or the user of the drive device is minimized.

[0033] Compared to the prior art, the elements around the helical compression spring, the outer guiding element and the outer tube, fulfill their functions independently of one another. What is customary in the prior art is either a plastic sleeve, which fulfills both the guiding task for the helical compression spring and the support task for the drive device, or a steel tube, which either fulfills only the support task or both the guiding and support tasks.

[0034] Since, according to the invention, the outer tube and the outer guiding element are divided, the outer tube and the outer guiding element can be optimized independently of one another for different tasks. For example, the outer tube can be designed to have high mechanical stability for the support task. The outer guiding element can be designed to have a low friction coefficient with the helical compression spring for the guiding task.

[0035] The division into an outer tube and an outer guiding element is particularly advantageous for drive devices that have to exert high forces, since a sufficient mechanical stability and a sufficiently low friction coefficient cannot be achieved with a single material at reasonable costs.

[0036] However, additional components lead to additional costs, for example for part production, injection molding tools, storage and logistics. Another difficulty when using a drive device in a motor vehicle with additional components is the additional risk of components colliding with each other, for example when driving over cobblestones or rough terrain, since new contact points are created between the components.

[0037] The outer guide end of the helical compression spring is preferably guided only by the outer guide element in any state of movement of the inner element relative to the outer tube. In particular, the outer guide end is not guided by the inner guide element in any state of movement.

[0038] The inner guide end of the helical compression spring is preferably guided only by the inner guide element in any state of movement of the inner element relative to the outer tube. In particular, the inner guide end is not guided by the outer guide element in any state of movement.

[0039] The guide element length of the outer guide element and / or the inner guide element along the longitudinal axis is preferably 30% to 80%, preferably 50% to 70%, more preferably 50% or 60%, of the spring length of the helical compression spring along the longitudinal axis in a state in which the inner element is retracted most into the outer tube along the longitudinal axis.

[0040] The partial length of the outer guide end and / or the inner guide end of the helical compression spring along the longitudinal axis is preferably 30% to 70%, preferably 40% to 60%, more preferably 50%, of the spring length of the helical compression spring along the longitudinal axis in a state in which the inner element is retracted most into the outer tube along the longitudinal axis.

[0041] In the state of maximum retraction of the inner element, the helical compression spring is subjected to a lower pressure load along the longitudinal axis than in the state in which the inner element extends further out of the outer tube. In particular, in the state of maximum retraction of the inner element, the helical compression spring can be essentially free of tensile or compressive load along the longitudinal axis, so that the length of the helical compression spring in this state corresponds to the rest length of the helical compression spring.

[0042] Tests have shown that the above values for the guide element length and the partial length result in a particularly strong reduction in the frictional power between the helical compression spring and the guide elements.

[0043] The two guide elements are preferably designed such that, in the state of maximum retraction of the inner element, the helical compression spring is guided on only one side (inner side or outer side) to a large extent.

[0044] It has been found that the highest load between the helical compression spring and the guide elements occurs at both ends of the spring. The spring guide on one side reduces the relative speed between the spring end and the respective guide element. This brings advantages to the energizing behavior of the spring, which reduces the noise and reduces the wear of the drive device.

[0045] Therefore, the two guide elements are preferably designed such that the spring ends are guided from only one side (inner or outer side) even in the fully compressed state of the helical compression spring when the inner element is maximally extended from the outer tube.

[0046] In at least one state of movement of the inner element relative to the outer tube, preferably in any state of movement, the inner element is preferably radially spaced apart from the outer guide end of the helical compression spring by an inner distance relative to the longitudinal axis.

[0047] In at least one state of movement of the inner element relative to the outer tube, preferably in any state of movement, the outer tube is preferably radially spaced apart from the inner guide end of the helical compression spring by an outer distance relative to the longitudinal axis.

[0048] The inner distance and / or the outer distance ensure that the ends of the helical compression spring do not come into contact with the inner element and / or the outer tube, which would lead to increased friction, increased wear and increased noise.

[0049] In at least one state of movement of the inner element relative to the outer tube, preferably in any state of movement, the outer guide end of the helical compression spring preferably has an outer guide gap relative to the longitudinal axis radially.

[0050] The inner diameter of the outer guide element is preferably chosen such that there is a small outer guide gap even in the most unfavorable position, in particular when the helical compression spring is maximally compressed due to the inner element being maximally extended from the outer tube, resulting in a slight expansion of the outer diameter of the helical compression spring.

[0051] In at least one state of movement of the inner element relative to the outer tube, preferably in any state of movement, the inner guide end of the helical compression spring preferably has an inner guide gap relative to the longitudinal axis radially.

[0052] The outer diameter of the inner guide element is preferably chosen such that there is a small inner guide gap even in the most unfavorable position, in particular if the helical compression spring is relaxed due to the inner element being maximally inserted into the outer tube.

[0053] The inner guide gap and / or the outer guide gap reduce the friction between the helical compression spring and the guide elements and reduce the risk of the helical compression spring jamming with the guide elements.

[0054] The outer guiding element preferably comprises a plurality of elastic compensation elements, preferably ribs, on the side facing the outer tube, for biasing on the outer tube and / or for tolerance compensation of the outer tube.

[0055] The inner guiding element preferably comprises a plurality of elastic compensation elements, preferably ribs, on the side facing the inner element, for biasing on the inner element and / or for tolerance compensation of the inner element.

[0056] The compensation elements allow a force-locked fixing of the guiding elements, in particular against displacement along the longitudinal axis, so that the guiding elements remain at the desired position required for the desired guiding of the helical compression spring. Furthermore, the compensation elements reduce the manufacturing precision required for the guiding elements, so that they can be manufactured faster and / or more economically.

[0057] The inner guiding element is for example essentially cylindrical and / or arranged coaxially to the longitudinal axis. The inner guiding element can be hollow or filled.

[0058] The inner guiding element preferably comprises a support element, preferably a protrusion radially away from the longitudinal axis, to support the inner guiding end of the helical compression spring along the longitudinal axis. By means of the support element, the helical compression spring can support itself firmly on the inner guiding element without additional components.

[0059] The outer guiding element is for example essentially cylindrical and / or arranged coaxially to the longitudinal axis.

[0060] The outer guiding element preferably comprises a centering element, preferably a cone radially towards the longitudinal axis, to center the inner element in the outer guiding element. The centering element simplifies the assembly of the drive device. Furthermore, the centering element can serve as a support element to support the outer guiding end of the helical compression spring along the longitudinal axis. By means of the centering element, the helical compression spring can thus support itself firmly on the outer guiding element without additional components.

[0061] The outer guiding element can comprise a plurality of elastic clamping elements, in particular a plurality of elastic arms pointing towards the longitudinal axis, for clamping the inner element in the outer guiding element.

[0062] The outer guiding element and / or the inner guiding element preferably comprises or consists of at least one plastic, preferably a low-friction and / or self-lubricating plastic, particularly preferably polyamide, polyoxymethylene, polycarbonate or polytetrafluoroethylene. Guiding elements made of plastic are inexpensive and lightweight and have good self-lubricating and dry-running properties.

[0063] The outer guiding element and / or the inner guiding element preferably has a low excitation surface for the helical compression spring on the side facing the helical compression spring.

[0064] The outer tube and / or the inner element preferably comprises or consists of metal, preferably steel. The outer tube or the inner element can be cost-effectively manufactured in a metal having high mechanical stability.

[0065] The helical compression spring preferably comprises or consists of metal, preferably steel, more preferably spring steel. The helical compression spring can be cost-effectively manufactured in a metal having high mechanical stability. Preferably, the helical compression spring comprises a corrosion protection.

[0066] The helical compression spring preferably comprises a plastic flocking to reduce the friction on the outer guiding element and / or the inner guiding element. The plastic flocking also reduces the wear and noise of the drive device.

[0067] The plastic flocking is particularly preferably impregnated with a dry lubricant. The dry lubricant reduces the friction between the helical compression spring and the guiding elements.

[0068] The outer guiding element and / or the inner guiding element preferably has a plurality of grooves, in particular perforations, radial to the longitudinal axis. The grooves can reduce the material requirement and the weight of the guiding elements without significantly impairing the guiding effect. Furthermore, the grooves can serve as reservoirs for retaining lubricant to reduce the friction between the helical compression spring and the outer guiding element and / or the inner guiding element.

[0069] The outer guiding element and / or the inner guiding element is designed, for example, as a grid. The grid can provide sufficient mechanical stability and guiding effect with particularly low material requirement, but can only be manufactured with great effort, for example by injection molding. BRIEF DESCRIPTION OF DRAWINGS

[0070] Further advantages, objects and characteristics of the present application will be explained on the basis of the following description and the attached drawings, in which an exemplary object of the present application is introduced. Features which are essentially identical in the drawings can be denoted by the same reference signs, so that these features do not have to be marked and explained in all of the drawings.

[0071] figure 1 A schematic longitudinal section of a drive device in the prior art is shown along the longitudinal axis.

[0072] figure 2 A schematic longitudinal section of a drive device according to the present application is shown along the longitudinal axis. DETAILED DESCRIPTION

[0073] figure 1

[0074] figure 1 A schematic longitudinal section of a drive device 100 in the prior art is shown along the longitudinal axis.

[0075] The drive device 100 is designed for moving a closure element of a motor vehicle relative to a body of the motor vehicle. The drive device 100 comprises an outer tube 110 for connecting to the body having a longitudinal axis L and an inner element 120 arranged partially in the outer tube 110 for connecting to the closure element, for example via an inner connecting element 128, in particular a ball socket, connected to one end of the inner element 120.

[0076] The outer tube 110 and the inner element 120 are for example each substantially hollow cylindrical. The outer tube 110 and the inner element 120 are for example arranged coaxially with the longitudinal axis L.

[0077] The drive device 100 comprises a helical compression spring 130 arranged radially between the inner element 120 and the outer tube 110 relative to the longitudinal axis L and an inner guide element 122 arranged radially between the inner element 120 and the helical compression spring 130 relative to the longitudinal axis L and axially fixed to the inner element 120 for internally guiding the helical compression spring 130 along the longitudinal axis L.

[0078] The inner element 120 is telescopically extendable along the longitudinal axis L from the outer tube 110 such that the closure element connected to the inner element 120 is movable relative to the body connected to the outer tube 110.

[0079] The helical compression spring 130 is clamped between the inner guide element 122 and the outer tube 120 in such a way that the helical compression spring 130 is compressed against the spring tension of the helical compression spring 130 when the inner element 120 is pulled out of the outer tube 110.

[0080] The inner guide element 122 comprises a support element 126, for example a protrusion radially away from the longitudinal axis L, to support the helical compression spring 130 along the longitudinal axis L.

[0081] The drive device 100 comprises for example an electromechanical drive unit 140 for displacing the inner element 120 along the longitudinal axis relative to the outer tube 110. The drive unit 140 can comprise in particular an electric motor and a threaded spindle driven thereby such that the drive device 100 is a spindle drive according to the contradiction design.

[0082] The drive unit 140 can be connected to the outer tube 110 for example opposite the inner connecting element 128 of the outer tube 110 and to the body via an outer connecting element 118, for example via a further ball socket.

[0083] The graph above the drive device 100 shows a schematic curve of the velocity v of the helical compression spring 130 relative to the inner guide element 122 as a function of the distance x from the end of the helical compression spring 130 facing the inner connection element 128 along the longitudinal axis L, when the inner element 120 is pulled out of the outer tube with a pull-out velocity vi.

[0084] At the end of the helical compression spring 130 facing the connection element 128 (at x = 0), the velocity v of the helical compression spring 130 corresponds to the pull-out velocity vi. With increasing distance x, the velocity v linearly decreases to 0 at the other end of the helical compression spring 130, where the helical compression spring 130 is supported on the support element 126 of the inner guide element 122.

[0085] figure 2

[0086] figure 2 A schematic longitudinal section of the drive device 100 according to the application along the longitudinal axis L is shown.

[0087] In contrast to the prior art shown in figure 1 The inner guide element 122 is designed for the inner guidance of only the inner guide end 132 of the helical compression spring 130.

[0088] figure 2 The drive device 100 shown in comprises an outer guide element 111 arranged radially with respect to the longitudinal axis L between the outer tube 110 and the helical compression spring 130 and axially fixed to the outer tube 110 for the outer guidance of the outer guide end 132 of the helical compression spring 130 (opposite to the outer guide end 131 along the longitudinal axis L) along the longitudinal axis L.

[0089] The helical compression spring 130 is clamped between the inner guide element 122 and the outer guide element 111 in such a way that the helical compression spring 130 is compressed against the spring tension of the helical compression spring 130 when the inner element 120 is pulled out of the outer tube 110.

[0090] The outer guide end 131 of the helical compression spring 130 is supported on the outer guide element 111 along the longitudinal axis L, in particular on the centering element 117 of the outer guide element 111.

[0091] The inner guide end 132 of the helical compression spring 130 is supported on the inner guide element 122 along the longitudinal axis L, in particular on the support element 126 of the inner guide element 122.

[0092] The outer guiding end portion 131 of the helical compression spring 130 is guided only by the outer guiding element 111 in at least one movement state of the inner element 120 relative to the outer tube 110, and the inner guiding end portion 132 of the helical compression spring 130 is guided only by the inner guiding element 122 in the at least one movement state.

[0093] The guiding element lengths of the outer guiding element 111 and the inner guiding element 122 along the longitudinal axis L are, for example, 50% to 60% of the spring length of the helical compression spring 130 in a state in which the helical compression spring 130 is retracted to the greatest extent into the outer tube 110 along the longitudinal axis L, respectively, as shown in figure 2

[0094] As a result, the outer guiding end portion 131 and the inner guiding end portion 132 of the helical compression spring 130 are each guided only on one side (inner side or outer side). The middle portion 133 of the helical compression spring 130, which is located between the two end portions 131, 132, can be guided on both sides (outer side and inner side).

[0095] The graph above the drive device 100 shows a schematic curve of the speed v of the helical compression spring 130 relative to the inner guiding element 122 and the outer guiding element 111 as a function of the distance x along the longitudinal axis L from the end of the helical compression spring 130 facing the inner connecting element 128 when the inner element 120 is pulled out of the outer tube at a pull-out speed vi.

[0096] The speed v is shown as a solid line in the region in which the respective guiding element 111, 122 guides the helical compression spring 130 and as a dashed line in the region in which the respective guiding element 111, 122 does not guide the helical compression spring.

[0097] Only the outer guiding end portion 131 of the helical compression spring 130 facing the connecting element 128 is guided by the outer guiding element 111. The speed v at the end of the helical compression spring 130 facing the connecting element 128 (at x = 0), in which the helical compression spring 130 bears on the centering element 117 of the inner guiding element 122, is 0 and increases linearly with increasing distance x to the middle portion 133.

[0098] The inner guiding end portion 132 of the helical compression spring 130, which follows the middle portion 133 at increasing distance x, is not guided by the outer guiding element 111 but by the inner guiding element 122. The further increase in the speed v (dashed line) with further increasing distance x is therefore independent of the function of the drive device 100.

[0099] ​The relative velocity v (solid line) of the inner guiding end 132 of the helical compression spring 130 with respect to the inner guiding element 122 as shown decreases linearly with increasing distance x at the end of the helical compression spring 130 to zero, wherein the helical compression spring 130 is supported on the support element 126 of the inner guiding element 122. figure 1

[0100] Thus, the velocity v (solid line) of the helical compression spring 130 with respect to the respective guiding guide element 111, 122 in connection with the function of the drive device 100 is far below the pull-out velocity vl along the entire helical compression spring 130.

[0101] Compared to the prior art, the lower velocity v reduces wear and noise.

[0102] List of reference signs

[0103] ​

Claims

1. Drive device (100) for moving a closure element of a motor vehicle relative to a main body of the motor vehicle, comprising a. an outer tube (110) with a longitudinal axis (L) for connecting to the main body or to the closure element, b. an inner element (120) arranged at least partially in the outer tube (110) for connecting to the other one of the main body and the closure element, c. a helical compression spring (130) arranged radially between the inner element (120) and the outer tube (110) relative to the longitudinal axis (L), and d. an inner guide element (122) arranged radially between the inner element (120) and the helical compression spring (130) relative to the longitudinal axis (L) and axially fixed to the inner element (120) for inner guiding of an inner guide end (132) of the helical compression spring (130) along the longitudinal axis (L), e. wherein the inner element (120) is telescopically extendable along the longitudinal axis (L) from the outer tube (110), and f. wherein the helical compression spring (130) is clamped between the inner element (120) and the outer tube (110) in such a way that the helical compression spring (130) is compressed against a spring tension of the helical compression spring (130) during an extension movement of the inner element (120) from the outer tube (110), characterized in that g. an outer guide element (111) is arranged radially between the outer tube (110) and the helical compression spring (130) relative to the longitudinal axis (L) and axially fixed to the outer tube (110) for outer guiding of an outer guide end (131) of the helical compression spring (130) along the longitudinal axis (L) opposite to the inner guide end (132), h. wherein the outer guide end (131) of the helical compression spring (130) is guided only by the outer guide element (111) in at least one movement state of the inner element (120) relative to the outer tube (110), and i. wherein the inner guide end (132) of the helical compression spring (130) is guided only by the inner guide element (122) in the at least one movement state.

2. Drive device (100) according to claim 1, characterized in that a. the outer guide end (131) of the helical compression spring (130) is guided only by the outer guide element (111) in any movement state of the inner element (120) relative to the outer tube (110), and / or b. the inner guide end (132) of the helical compression spring (130) is guided only by the inner guide element (122) in any movement state of the inner element (120) relative to the outer tube (110).

3. Drive device (100) according to claim 1, characterized in that ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The guide element length of the outer guide element (111) and / or of the inner guide element (122) along the longitudinal axis (L) is 40% to 80% of the spring length of the helical compression spring (130) in the state in which the inner element (120) is retracted to the greatest extent into the outer tube (110) along the longitudinal axis (L).

4. The drive device (100) according to claim 1, characterized in that The partial length of the outer guide end (131) and / or of the inner guide end (132) of the helical compression spring (130) along the longitudinal axis (L) in the state in which the inner element (120) is retracted to the greatest extent into the outer tube (110) along the longitudinal axis (L) is 30% to 70% of the spring length of the helical compression spring (130) along the longitudinal axis (L).

5. The drive device (100) according to claim 1, characterized in that a. the inner element (120) is radially spaced apart from the outer guide end (131) of the helical compression spring (130) with respect to the longitudinal axis (L) by an inner distance in the at least one movement state of the inner element (120) relative to the outer tube (110), and / or b. the outer tube (110) is radially spaced apart from the inner guide end (132) of the helical compression spring (130) with respect to the longitudinal axis (L) by an outer distance in the at least one movement state of the inner element (120) relative to the outer tube (110).

6. The drive device (100) according to claim 1, characterized in that a. the outer guide end (131) of the helical compression spring (130) has a radial outer guide clearance with respect to the longitudinal axis (L) in the at least one movement state of the inner element (120) relative to the outer tube (110), and / or b. the inner guide end (132) of the helical compression spring (130) has a radial inner guide clearance with respect to the longitudinal axis (L) in the at least one movement state of the inner element (120) relative to the outer tube (110).

7. The drive device (100) according to claim 1, characterized in that a. the outer guide element (111) comprises a plurality of elastic compensation elements on the side facing the outer tube (110) for biasing against the outer tube (110) and / or for tolerance compensation of the outer tube (110), and / or b. the inner guide element (122) comprises a plurality of elastic compensation elements on the side facing the inner element (120) for biasing against the inner element (120) and / or for tolerance compensation of the inner element (120).

8. The drive device (100) according to claim 1, characterized in that a. the inner guide element (122) is substantially cylindrical and / or arranged coaxially with the longitudinal axis (L), b. wherein the inner guide element (122) comprises a support element (126) for supporting the inner guide end (132) of the helical compression spring (130) along the longitudinal axis (L).

9. Drive device (100) according to claim 1, characterized in that a. the outer guide element (111) is essentially hollow-cylindrical and / or arranged coaxially to the longitudinal axis (L), b. wherein the outer guide element (111) comprises a centering element (117) for centering the inner element (120) in the outer guide element (111).

10. Drive device (100) according to claim 1, characterized in that the outer guide element (111) and / or the inner guide element (122) comprise a low-friction and / or self-lubricating plastic.

11. Drive device (100) according to claim 1, characterized in that the outer tube (110) and / or the inner element (120) comprise or consist of metal.

12. Drive device (100) according to claim 1, characterized in that the helical compression spring (130) comprises or consists of metal.

13. Drive device (100) according to claim 1, characterized in that the outer guide element (111) and / or the inner guide element (122) have a plurality of grooves radial to the longitudinal axis (L).

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