Link system

Abstract

Steering system (1), in particular a steer-by-wire steering system for a motor vehicle, comprising: a steering housing (10); a steering spindle (12, 112, 212, 312, 412) inserted at least partially into the steering housing (10) and rotatably mounted therein; a worm (14, 114, 214, 314, 414) mounted non-rotatably on the steering spindle (12, 112, 212, 312, 412), on whose outer surface (14c, 114c, 214c, 314c, 414c) a spiral groove (16, 116, 216, 316, 416) is formed; a guide pin (18, 118, 218, 318, 418) arranged on the steering housing (10), which is inserted at least partially into the spiral groove (16, 116, 216, 316, 416), wherein the spiral groove (16, 116, 216, 316, 416) of the worm (14, 114, 214, 314, 414) is guideable on the guide pin (18, 118, 218, 318, 418) when the worm (14, 114, 214, 314, 414) rotates due to rotation of the steering spindle (12, 112, 212, 312, 412) and is guided on the guide pin (18, 118, 218, 318, 418) by guidance on the guide pin (18, 118, 218, 318, 418) is axially displaceable, wherein a first end stop (12a, 112a, 212a, 312a, 416a) of the steering spindle (12, 112, 212, 312, 412) is provided at or adjacent to a first end section (16a, 116a, 216a, 316a, 416) of the helical groove (16, 116, 216, 316, 416) in a first direction of rotation (R1) of the steering spindle (12, 112, 212, 312, 412), wherein a first end stop (12a, 112a, 212a, 312a, 412a) of the steering spindle (12, 112, 212, 312, 412) is provided at or adjacent to a second end section (16b, 116b, 216b, 316b, 416b) of the helical groove (16, 116, 216, 316, 416) 216, 316,416) a second end stop (12b, 112b, 212b, 312b, 412b) of the steering spindle (12, 112, 212, 312, 412) is provided in a second direction of rotation (R2) of the steering spindle (12, 112, 212, 312, 412), characterized in that the worm (14, 114) has a substantially radially extending first lug (20, 120) at a first axial end section (14a, 114a) and a substantially radially extending second lug (22, 122) at a second axial end section (14b, 114b), wherein the guide pin (18, 118) is designed to engage the first end stop (12a, 112a) of the steering spindle (12, 112) to strike the first nose (20, 120) and to strike the second nose (22, 122) at the second end stop (12b, 112b) of the steering spindle (12, 112), wherein a stop pin (24) is arranged on the steering housing (10) symmetrically to the guide pin (18) with respect to a central longitudinal axis (L) of the worm (14),wherein the worm (14) has a substantially radially extending third nose (26) at the first axial end section (14a) of the worm (14), symmetrically with respect to the first nose (20) and the central longitudinal axis (L) of the worm (14), and wherein the worm (14) has a substantially radially extending fourth nose (28) at the second axial end section (14b) of the worm (14), symmetrically with respect to the second nose (22) and the central longitudinal axis (L) of the worm (14), the stop pin (24) being configured to abut the third nose (26) at the first end stop (12a) of the steering spindle (12) and to abut the fourth nose (28) at the second end stop (12b) of the steering spindle (12).

Description

[0001] The invention relates to a steering system, in particular a steer-by-wire steering system for a motor vehicle according to the preamble of claim 1. Furthermore, the invention relates to the steering systems according to the preambles of claims 3, 4 and 9. State of the art

[0002] Various concepts regarding the realization of a rotation angle limitation of a steering spindle of a steering system, especially for application within a steer-by-wire steering system, are known within the framework of the prior art.

[0003] DE 100 17 049 A1 discloses a steering device for a motor vehicle, comprising a steering handle connected to it via a steering spindle in rotary connection and a steering gear, wherein the torque connection of the steering spindle to the steering gear can be effected via mechanical, hydraulic, pneumatic or electrical transmission elements depending on the design of the steering device, wherein the steering spindle has axial and / or torsional stops on the low-torque side for limiting the angle of rotation in both directions of rotation and counter-stops are arranged on the housing side.

[0004] The invention is therefore based on the objective of providing an improved steering system, particularly for use in a steer-by-wire steering system, which has improved properties with regard to force action at the end stop and which can itself be operated without hindrance.

[0005] The problem is solved with a steering system, in particular a steer-by-wire steering system for a motor vehicle, having the features of independent claims 1, 3 and 4 and 9. Disclosure of the invention

[0006] The present invention provides a steering system, in particular a steer-by-wire steering system for a motor vehicle, comprising a steering housing, a steering spindle inserted at least partially into the steering housing and rotatably mounted therein, a worm gear mounted non-rotatably on the steering spindle, the outer surface of which has a spiral groove, and a guide pin arranged on the steering housing which is inserted at least partially into the spiral groove, wherein the spiral groove of the worm gear is guided on the guide pin during rotation of the worm gear caused by rotation of the steering spindle and is axially displaceable by being guided on the guide pin, wherein a first end stop of the steering spindle is provided at or adjacent to a first end section of the spiral groove in a first direction of rotation of the steering spindle.and wherein a second end stop of the steering spindle in a second direction of rotation of the steering spindle is provided at or adjacent to a second end section of the spiral groove.

[0007] The worm gear has a substantially radially extending first lug at a first axial end section and a substantially radially extending second lug at a second axial end section, wherein the guide pin is configured to abut the first lug at the first end stop of the steering spindle and to abut the second lug at the second end stop of the steering spindle, and wherein a stop pin is arranged on the steering housing symmetrically to the guide pin with respect to a central longitudinal axis of the worm gear, wherein the worm gear has a substantially radially extending third lug at the first axial end section of the worm gear symmetrically to the first lug with respect to the central longitudinal axis of the worm gear, and wherein the worm gear has a substantially radially extending fourth lug at the second axial end section of the worm gear symmetrically to the second lug with respect to the central longitudinal axis of the worm gear.wherein the stop pin is designed to strike the third lug on the first end stop of the steering spindle and to strike the fourth lug on the second end stop of the steering spindle.

[0008] The present invention further provides a steering system, in particular a steer-by-wire steering system for a motor vehicle, comprising a steering housing, a steering spindle inserted at least partially into the steering housing and rotatably mounted therein, a worm gear mounted non-rotatably on the steering spindle, the outer surface of which has a spiral groove, and a guide pin arranged on the steering housing which is inserted at least partially into the spiral groove, wherein the spiral groove of the worm gear is guided on the guide pin during rotation of the worm gear caused by rotation of the steering spindle and is axially displaceable by being guided on the guide pin, wherein a first end stop of the steering spindle in a first direction of rotation of the steering spindle is provided at or adjacent to a first end section of the spiral groove.and wherein a second end stop of the steering spindle in a second direction of rotation of the steering spindle is provided at or adjacent to a second end section of the spiral groove.

[0009] The worm gear has a substantially radially extending first lug at a first axial end section and a substantially radially extending second lug at a second axial end section, wherein the guide pin is configured to abut the first lug at the first end stop of the steering spindle and to abut the second lug at the second end stop of the steering spindle, and wherein, symmetrically to the guide pin with respect to a central longitudinal axis of the worm gear, a further guide pin, inserted at least partially into the helical groove, is arranged on the steering housing, wherein, symmetrically to the first lug with respect to the central longitudinal axis of the worm gear, the worm gear has a substantially radially extending third lug at the first axial end section of the worm gear.and wherein the worm has, symmetrically to the second nose with respect to the central longitudinal axis of the worm, a substantially radially extending fourth nose at the second axial end section of the worm, wherein the further guide pin is designed to abut the third nose at the first end stop of the steering spindle and to abut the fourth nose at the second end stop of the steering spindle.

[0010] The present invention furthermore provides a steering system, in particular a steer-by-wire steering system for a motor vehicle, comprising a steering housing, a steering spindle inserted at least partially into the steering housing and rotatably mounted therein, a worm gear mounted non-rotatably on the steering spindle, the outer surface of which has a spiral groove formed, a guide pin arranged on the steering housing which is inserted at least partially into the spiral groove, wherein the spiral groove of the worm gear is guided on the guide pin during rotation of the worm gear caused by rotation of the steering spindle and is axially displaceable by being guided on the guide pin, wherein a first end stop of the steering spindle in a first direction of rotation of the steering spindle is provided at or adjacent to a first end section of the spiral groove.and wherein a second end stop of the steering spindle in a second direction of rotation of the steering spindle is provided at or adjacent to a second end section of the spiral groove.

[0011] The worm gear has a first lug extending substantially radially at a first axial end section. Furthermore, the worm gear has a second lug extending substantially radially at the first axial end section, symmetrically to the first lug with respect to the central longitudinal axis of the worm gear. A first stop pin is arranged on the steering housing symmetrically to the guide pin with respect to the central longitudinal axis of the worm gear. A second stop pin is arranged on the steering housing axially offset from the guide pin, and a third stop pin is arranged on the steering housing axially offset from the first stop pin.

[0012] The present invention further provides a steering system, in particular a steer-by-wire steering system for a motor vehicle, comprising a steering housing, a steering spindle inserted at least partially into the steering housing and rotatably mounted therein, a worm gear mounted non-rotatably on the steering housing and axially displaceable, wherein the worm gear has a cylindrical opening along its central longitudinal axis into which the steering spindle is inserted, wherein a spiral groove is formed on an inner surface of the cylindrical opening of the worm gear, and a guide pin arranged on the steering spindle which is inserted at least partially into the spiral groove, wherein the worm gear is axially movable by the spiral groove on the guide pin when the guide pin rotates due to rotation of the steering spindle.wherein a first end stop of the steering spindle in a first direction of rotation of the steering spindle is provided at or adjacent to a first end section of the helical groove, and wherein a second end stop of the steering spindle in a second direction of rotation of the steering spindle is provided at or adjacent to a second end section of the helical groove.

[0013] One aspect of the present invention is to advantageously provide end stops at the end sections of the groove by providing the worm, which is rotationally fixed to the steering spindle, with a groove in which the guide pin is movable. This reduces the possibility of self-locking of the components. Furthermore, lower forces are exerted by each stop in the circumferential direction, thus preventing jamming at the end stop. Providing the worm with the spiral groove also eliminates the need for complex machining of the steering spindle, resulting in more cost-effective manufacturing. Additionally, the required installation space can be reduced because the thread pitch of the spiral groove can be adapted to specific requirements.

[0014] Furthermore, the guide pin is advantageously movable along the spiral groove from a first end stop to a second end stop as the worm rotates. Due to the symmetrical arrangement of the stop pin relative to the guide pin, a lateral force-free stop is thus advantageously achieved at the respective lugs.

[0015] The use of two guide pins advantageously enables even improved guidance or lateral force-free guidance of the screw along the guide pins.

[0016] In a further embodiment, the respective end stop is advantageously formed by the pins fixed to the housing, i.e., the guide pin and the three stop pins, wherein the worm is moved axially when it is rotated until the respective lugs of the worm strike the corresponding pins.

[0017] Advantageous embodiments and further developments are described in the dependent claims and in the description with reference to the figures.

[0018] According to a further preferred embodiment, the stop pin is designed to strike the third nose simultaneously with the strike of the guide pin on the first nose, and wherein the stop pin is designed to strike the fourth nose simultaneously with the strike of the guide pin on the second nose.

[0019] Due to the simultaneous stop action, lateral forces at the stop can be advantageously avoided, thus preventing bending of the steering spindle. This also allows for the use of a smaller steering spindle and smaller bearings.

[0020] According to a further preferred embodiment, the nose and the further nose of the worm gear are arranged such that at the first end stop of the steering spindle, the nose abuts the guide pin and the further nose simultaneously abuts the first stop pin, and wherein at the second end stop of the steering spindle, the nose abuts the second stop pin and the further nose simultaneously abuts the third stop pin, wherein the nose is axially movable between the guide pin and the second stop pin and the further nose is axially movable between the first stop pin and the third stop pin.

[0021] This advantageously allows for a transverse force-free stop of the worm's noses against the respective housing-fixed pins.

[0022] According to a further preferred embodiment, the at least one guide pin is designed with a stepped profile, comprising a first section with a larger diameter and a second section with a smaller diameter, wherein the first section with the larger diameter is connected to the housing, and wherein the second section with the smaller diameter is inserted into the helical groove of the screw. Thus, the groove can advantageously be dimensioned to have a smaller width.

[0023] Because the thinner part of the pin runs in the spiral groove and the thicker part collides with the lugs, only the thicker part needs to be reinforced with material or made with more volume.

[0024] According to a further preferred embodiment, the guide pin is connected to the steering housing or integrally formed with the steering housing, wherein the worm has an opening formed along its central longitudinal axis for receiving the steering spindle, wherein guide elements are arranged in the longitudinal direction of the opening, on which the worm can be linearly displaced on the steering spindle.

[0025] Depending on systemic or structural requirements, the pin(s) can thus be attached to the steering housing in a suitable manner or be integrally formed with it.

[0026] According to a further preferred embodiment, the worm gear is connected to the steering spindle by a rotary damper, wherein the rotary damper comprises a first damping element arranged on the steering spindle and rotationally fixed to the steering spindle, the first damping element being made of an elastic material, preferably an elastomer, and having external teeth, and wherein the rotary damper comprises a second damping element arranged on an inner circumference of the worm gear and rotationally fixed to the worm gear, the second damping element being made of an elastic material, preferably an elastomer, and having internal teeth, the external teeth of the first damping element being in engagement with the internal teeth of the second damping element. Thus, for example, a vibration that may result from the stop or...The force is dampened so that it is not transmitted to the steering wheel of the motor vehicle.

[0027] According to a further preferred embodiment, the screw has a first nose extending substantially radially at a first axial end section and a second nose extending substantially radially at a second axial end section, wherein the guide pin is designed to strike the first nose at the first end stop of the steering spindle and to strike the second nose at the second end stop of the steering spindle.

[0028] The guide pin is thus advantageously movable from a first end stop to the second end stop when the worm is rotated along the spiral groove.

[0029] According to a further preferred embodiment, a stop pin is arranged on the steering spindle symmetrically to the guide pin with respect to a central longitudinal axis of the worm, wherein the worm has a substantially radially extending third nose symmetrically to the first nose with respect to the central longitudinal axis of the worm at the first axial end section of the worm, and wherein the worm has a substantially radially extending fourth nose symmetrically to the second nose with respect to the central longitudinal axis of the worm at the second axial end section of the worm, wherein the stop pin is designed to abut the third nose at the first end stop of the steering spindle and to abut the fourth nose at the second end stop of the steering spindle.

[0030] Due to the symmetrical arrangement of the stop pin to the guide pin, a lateral force-free stop is advantageously achieved at the respective noses.

[0031] According to a further preferred embodiment, the spiral groove is designed such that the screw can be linearly displaced when the screw is rotated, with the slope of the spiral groove being greater at the respective end sections.

[0032] This saves installation space. Furthermore, the pins are quickly pulled out of the path of the guides. Afterwards, they move very little until just before the other stop. Since the worm gear only moves significantly near the end stop, the interaction between the steering spindle / worm gear and the housing is reduced to a minimum under normal operating conditions, resulting in acoustic and tactile advantages.

[0033] According to a further preferred embodiment, the screw is made of metal, in particular aluminum, or of plastic, and the noses are made of metal, in particular aluminum, or of plastic, in particular preferably at least partially of elastomer, as fiber-reinforced plastic, or as a plastic-encapsulated metal pin. This advantageously contributes to a reduction in weight and / or cost-effective manufacturing of the components.

[0034] The described configurations and training programs can be combined in any way desired.

[0035] Further possible embodiments, developments and implementations of the invention also include combinations of features of the invention described previously or subsequently with regard to the exemplary embodiments that are not explicitly mentioned. Brief description of the drawings

[0036] The accompanying drawings are intended to provide a further understanding of the embodiments of the invention. They illustrate embodiments and, in conjunction with the description, serve to explain the principles and concepts of the invention.

[0037] Other embodiments and many of the aforementioned advantages become apparent with reference to the drawings. The elements depicted in the drawings are not necessarily shown to scale.

[0038] They show: Fig. 1a a schematic representation of a steering system according to a first embodiment of the invention; Fig. 1b a cross-sectional view of a guide pin of the steering system according to the first embodiment of the invention; Fig. 2 a schematic representation of the steering system according to a second embodiment of the invention; Fig. 3 a schematic representation of the steering system according to a third embodiment of the invention; Fig. 4 a schematic representation of the steering system according to a sixth embodiment of the invention; and Fig. 5 a cross-sectional view of the steering system with a rotary damper according to the first to sixth embodiments of the invention.

[0039] In the figures of the drawings, identical reference symbols denote identical or functionally equivalent elements, parts or components, unless otherwise stated.

[0040] Fig. Figure 1a shows a schematic representation of a steering system according to a first embodiment of the invention.

[0041] The steering system 1 is designed as a steer-by-wire steering system for a motor vehicle. The steering system 1 comprises a steering housing 10 and a steering spindle 12, which is inserted at least partially into the steering housing 10 and rotatably mounted therein. Furthermore, the steering system 1 comprises a worm gear 14, which is non-rotatably mounted on the steering spindle 12 and on whose outer surface 14c a helical groove 16 is formed.

[0042] The worm gear 14 has an opening 30 formed along its central longitudinal axis L for receiving the steering spindle 12. Guide elements 32a, 32b are arranged in the longitudinal direction of the opening 30, on which the worm gear 14 can be linearly displaced on the steering spindle 12.

[0043] Furthermore, the steering system 1 has a guide pin 18 arranged on the steering housing 10. The guide pin 18 is inserted, at least partially, into the helical groove 16. Moreover, the helical groove 16 of the worm 14 can be guided on the guide pin 18 when the worm 14 rotates due to rotation of the steering spindle 12, and can be axially displaced by being guided on the guide pin 18.

[0044] A first end stop 12a of the steering spindle 12 is provided at or adjacent to a first end section 16a of the spiral groove 16 in a first direction of rotation R1 of the steering spindle 12. Furthermore, a second end stop 12b of the steering spindle 12 is provided at or adjacent to a second end section 16b of the spiral groove 16 in a second direction of rotation R2 of the steering spindle 12.

[0045] The screw 14 has a first nose 20 extending substantially radially at a first axial end section 14a. Furthermore, the screw 14 has a second nose 22 extending substantially radially at a second axial end section 14b.

[0046] The guide pin 18 is designed to engage the first lug 20 on the first end stop 12a of the steering spindle 12. Furthermore, the guide pin 18 is designed to engage the second lug 22 on the second end stop 12b of the steering spindle 12.

[0047] A stop pin 24 is arranged on the steering housing 10 symmetrically to the guide pin 18 with respect to a central longitudinal axis L of the worm 14. The worm 14 also has a third, substantially radially extending, nose 26 at the first axial end section 14a of the worm, symmetrically to the first nose 20 with respect to the central longitudinal axis L of the worm 14.

[0048] Furthermore, the screw 14 has a second axial end section 14b and a fourth nose 28 extending substantially radially, symmetrically to the second nose 22 with respect to the central longitudinal axis L of the screw 14.

[0049] The stop pin 24 is designed to strike the third nose 26 on the first end stop 12a of the steering spindle 12 and to strike the fourth nose 28 on the second end stop 12b of the steering spindle 12.

[0050] The stop pin 24 is further configured to strike the third lug 26 simultaneously with the strike of the guide pin 18 on the first lug 20. The stop pin 24 is also further configured to strike the fourth lug 28 simultaneously with the strike of the guide pin 18 on the second lug 22.

[0051] The spiral groove 16 is designed such that the screw can be linearly displaced when the screw is rotated, with the pitch of the spiral groove 16 being greater at the respective end sections.

[0052] Furthermore, the screw is preferably made of metal, in particular aluminum. Alternatively, the screw can be made of plastic, for example. The lugs are preferably made of metal, in particular aluminum. Alternatively, the lugs can be made of plastic, in particular preferably at least partially of elastomer, as fiber-reinforced plastic, or as a plastic-encapsulated metal pin.

[0053] Fig. Figure 1b shows a cross-sectional view of a guide pin of the steering system according to the first embodiment of the invention.

[0054] The at least one guide pin 18 is preferably designed with a stepped profile. For this purpose, the at least one guide pin 18 has a first section 18a with a larger diameter and a second section 18b with a smaller diameter. The first section 18a, with the larger diameter, is connected to the housing 10. The second section 18b, with the smaller diameter, is inserted into the helical groove 16 of the worm 14.

[0055] In the presentation of the Fig. 1a the guide pin 18 is not offset, which represents an alternative embodiment.

[0056] Fig. Figure 2 shows a schematic representation of the steering system according to a second embodiment of the invention.

[0057] The steering system 1 has a worm 114 mounted on the steering spindle 112 in a rotationally fixed manner, on the outer surface 114c of which a spiral groove 116 is formed.

[0058] The worm gear 114 has a first lug 120 extending substantially radially at a first axial end section 114a and a second lug 122 extending substantially radially at a second axial end section 114b. The guide pin 118 is designed to abut the first lug 120 at the first end stop 112a of the steering spindle 112 and to abut the second lug 122 at the second end stop 112b of the steering spindle 112.

[0059] Symmetrically to the guide pin 118, a further guide pin 124, inserted at least partially into the spiral groove 116, is arranged on the steering housing 10 with respect to a central longitudinal axis L of the worm 114. Symmetrically to the first lug 120 with respect to the central longitudinal axis L of the worm 114, the worm 114 has a third lug 126 extending substantially radially at the first axial end section 114a of the worm 114.

[0060] The worm 114 further has, symmetrically to the second lug 122 with respect to the central longitudinal axis L of the worm 114, a fourth lug 128 extending substantially radially at the second axial end section 114b of the worm 114. The further guide pin 124 is designed to engage the third lug 126 at the first end stop 12a of the steering spindle 12 and the fourth lug 128 at the second end stop 12b of the steering spindle 12.

[0061] Fig. Figure 3 shows a schematic representation of the steering system according to a third embodiment of the invention.

[0062] The steering system 1 has a worm 214 mounted on the steering spindle 212 in a rotationally fixed manner, on the outer surface 214c of which a spiral groove 216 is formed.

[0063] The screw 214 has a first nose 220 extending substantially radially at a first axial end section 214a. Furthermore, the screw 214 has a second nose 222 extending substantially radially at the first axial end section 214a of the screw 214, symmetrically to the first nose 220 with respect to the central longitudinal axis L of the screw 214.

[0064] Furthermore, a first stop pin 224 is arranged on the steering housing 10 symmetrically to the guide pin 218 with respect to the central longitudinal axis L of the worm gear 214. A second stop pin 226 is arranged on the steering housing 10 axially offset from the guide pin 218. A third stop pin 228 is arranged on the steering housing 10 axially offset from the first stop pin 224.

[0065] The nose 220 and the further nose 222 of the worm 214 are arranged such that at the first end stop 212a of the steering spindle 212 the nose 220 strikes the guide pin 218 and the further nose 222 strikes the first stop pin 224 at the same time.

[0066] At the second end stop 212b of the steering spindle 212, the nose 220 abuts the second stop pin 226, and the other nose 222 simultaneously abuts the third stop pin 228. The nose 220 is axially movable between the guide pins 218 and the second stop pin 226. The other nose 222 is axially movable between the first stop pin 224 and the third stop pin 228.

[0067] Fig. Figure 4 shows a schematic representation of the steering system according to a sixth embodiment of the invention.

[0068] The steering system 1 of this further alternative embodiment is designed as a steer-by-wire steering system for a motor vehicle. The steering system 1 comprises a steering housing 10 and a steering spindle 512 that is inserted at least partially into the steering housing 10 and rotatably mounted therein. Furthermore, the steering system 1 comprises a worm gear 514 that is rotationally fixed to the steering housing 10 and axially displaceable, and on whose inner surface 514c a helical groove 516 is formed.

[0069] The worm 514 has a cylindrical opening 536 along its central longitudinal axis L. The steering spindle 512 is inserted into the opening 536, with a helical groove 516 formed on an inner surface of the cylindrical opening 536 of the worm 514. Furthermore, the steering system 1 has a guide pin 518 arranged on the steering spindle 512. The guide pin 518 is inserted, at least partially, into the helical groove 516.

[0070] The worm 514 is axially movable by the spiral groove 516 on the guide pin 518 when the guide pin 518 rotates due to rotation of the steering spindle 512.

[0071] A first end stop 512a of the steering spindle 512 is provided at or adjacent to a first end section of the spiral groove 516 in a first direction of rotation R1 of the steering spindle 512. Furthermore, a second end stop 512b of the steering spindle 512 is provided at or adjacent to a second end section of the spiral groove 516 in a second direction of rotation R2 of the steering spindle 512.

[0072] The screw 514 has a first nose 520 extending substantially radially at a first axial end section 514a and a second nose 522 extending substantially radially at a second axial end section 514b.

[0073] The guide pin 518 is designed to strike the first nose 520 at the first end stop 512a of the steering spindle 512 and to strike the second nose 522 at the second end stop 512b of the steering spindle 512.

[0074] A stop pin 524 is arranged on the steering spindle 512 symmetrically to the guide pin 518 with respect to the central longitudinal axis L of the worm 514. Symmetrically to the first lug 520 with respect to the central longitudinal axis L of the worm 514, the worm 514 has a third lug 526 extending substantially radially at the first axial end section 514a of the worm 514.

[0075] The worm 514 further has a fourth nose 528 extending substantially radially at the second axial end section 514b of the worm, symmetrically to the second nose 522 with respect to the central longitudinal axis L of the worm 514. The stop pin 524 is designed to engage the third nose 526 at the first end stop 512a of the steering spindle 512 and the fourth nose 528 at the second end stop 512b of the steering spindle 512.

[0076] Fig. Figure 5 shows a cross-sectional view of the steering system with a rotary damper according to the first to sixth embodiments of the invention.

[0077] The worm gear 14 is connected to the steering spindle 12 by a rotary damper 34. The rotary damper 34 has a first damping element 34a arranged on the steering spindle 12 and rotationally fixed to the steering spindle 12.

[0078] The first damping element 34a is made of an elastic material, preferably an elastomer, and has external teeth 34a1. The rotary damper 34 has a second damping element 34b arranged on an inner circumference of the screw 14 and rotationally fixed to the screw 14. The second damping element 34b is made of an elastic material, preferably an elastomer, and has internal teeth 34b1. The external teeth 34a1 of the first damping element 34a engage with the internal teeth 34b1 of the second damping element 34b.

Claims

[1] Steering system (1), in particular a steer-by-wire steering system for a motor vehicle, comprising: a steering housing (10); a steering spindle (12, 112, 212, 312, 412) inserted at least partially into the steering housing (10) and rotatably mounted therein; a worm (14, 114, 214, 314, 414) mounted non-rotatably on the steering spindle (12, 112, 212, 312, 412), on whose outer surface (14c, 114c, 214c, 314c, 414c) a spiral groove (16, 116, 216, 316, 416) is formed; a guide pin (18, 118, 218, 318, 418) arranged on the steering housing (10), which is inserted at least partially into the spiral groove (16, 116, 216, 316, 416), wherein the spiral groove (16, 116, 216, 316, 416) of the worm (14, 114, 214, 314, 414) is guideable on the guide pin (18, 118, 218, 318, 418) when the worm (14, 114, 214, 314, 414) rotates due to rotation of the steering spindle (12, 112, 212, 312, 412) and is guided on the guide pin (18, 118, 218, 318, 418) by guidance on the guide pin (18, 118, 218, 318, 418) is axially displaceable, wherein a first end stop (12a, 112a, 212a, 312a, 416a) of the steering spindle (12, 112, 212, 312, 412) is provided at or adjacent to a first end section (16a, 116a, 216a, 316a, 416) of the helical groove (16, 116, 216, 316, 416) in a first direction of rotation (R1) of the steering spindle (12, 112, 212, 312, 412), wherein a first end stop (12a, 112a, 212a, 312a, 412a) of the steering spindle (12, 112, 212, 312, 412) is provided at or adjacent to a second end section (16b, 116b, 216b, 316b, 416b) of the helical groove (16, 116, 216, 316, 416) 216, 316,416) a second end stop (12b, 112b, 212b, 312b, 412b) of the steering spindle (12, 112, 212, 312, 412) in a second direction of rotation (R2) of the steering spindle (12, 112, 212, 312, 412) is provided, , characterized by, that the worm (14, 114) has a substantially radially extending first lug (20, 120) at a first axial end section (14a, 114a) and a substantially radially extending second lug (22, 122) at a second axial end section (14b, 114b), wherein the guide pin (18, 118) is configured to abut the first lug (20, 120) at the first end stop (12a, 112a) of the steering spindle (12, 112) and to abut the second lug (22, 122) at the second end stop (12b, 112b) of the steering spindle (12, 112), wherein a stop pin (24) is arranged on the steering housing (10) symmetrically to the guide pin (18) with respect to a central longitudinal axis (L) of the worm (14), wherein the screw (14) has a third nose (26) extending substantially radially at the first axial end section (14a) of the screw (14) symmetrically to the first nose (20) with respect to the central longitudinal axis (L) of the screw (14),and wherein the worm (14) has a substantially radially extending fourth nose (28) at the second axial end section (14b) of the worm (14), symmetrically with respect to the second nose (22) and the central longitudinal axis (L) of the worm (14), wherein the stop pin (24) is configured to abut the third nose (26) at the first end stop (12a) of the steering spindle (12) and to abut the fourth nose (28) at the second end stop (12b) of the steering spindle (12). [2] Steering system according to claim 1, characterized by , that the stop pin (24) is designed to strike the third lug (26) simultaneously with the strike of the guide pin (18) on the first lug (20), and wherein the stop pin (24) is designed to strike the fourth lug (28) simultaneously with the strike of the guide pin (18) on the second lug (22). [3] Steering system (1), in particular a steer-by-wire steering system for a motor vehicle, comprising: a steering housing (10); a steering spindle (12, 112, 212, 312, 412) inserted at least partially into the steering housing (10) and rotatably mounted therein; a worm (14, 114, 214, 314, 414) mounted non-rotatably on the steering spindle (12, 112, 212, 312, 412), on whose outer surface (14c, 114c, 214c, 314c, 414c) a spiral groove (16, 116, 216, 316, 416) is formed; a guide pin (18, 118, 218, 318, 418) arranged on the steering housing (10), which is inserted at least partially into the spiral groove (16, 116, 216, 316, 416), wherein the spiral groove (16, 116, 216, 316, 416) of the worm (14, 114, 214, 314, 414) is guideable on the guide pin (18, 118, 218, 318, 418) when the worm (14, 114, 214, 314, 414) rotates due to rotation of the steering spindle (12, 112, 212, 312, 412) and is guided on the guide pin (18, 118, 218, 318, 418) by guidance on the guide pin (18, 118, 218, 318, 418) is axially displaceable, wherein a first end stop (12a, 112a, 212a, 312a, 416a) of the steering spindle (12, 112, 212, 312, 412) is provided at or adjacent to a first end section (16a, 116a, 216a, 316a, 416) of the helical groove (16, 116, 216, 316, 416) in a first direction of rotation (R1) of the steering spindle (12, 112, 212, 312, 412), wherein a first end stop (12a, 112a, 212a, 312a, 412a) of the steering spindle (12, 112, 212, 312, 412) is provided at or adjacent to a second end section (16b, 116b, 216b, 316b, 416b) of the helical groove (16, 116, 216, 316, 416) 216, 316,416) a second end stop (12b, 112b, 212b, 312b, 412b) of the steering spindle (12, 112, 212, 312, 412) in a second direction of rotation (R2) of the steering spindle (12, 112, 212, 312, 412) is provided, , characterized by, that the worm (14, 114) has a substantially radially extending first lug (20, 120) at a first axial end section (14a, 114a) and a substantially radially extending second lug (22, 122) at a second axial end section (14b, 114b), wherein the guide pin (18, 118) is configured to abut the first lug (20, 120) at the first end stop (12a, 112a) of the steering spindle (12, 112) and to abut the second lug (22, 122) at the second end stop (12b, 112b) of the steering spindle (12, 112), wherein, symmetrically to the guide pin (118) with respect to a central longitudinal axis (L) of the worm (114), a further lug is inserted at least partially into the helical groove (116). Guide pin (124) is arranged on the steering housing (10),wherein the worm (114) has a substantially radially extending third nose (126) at the first axial end section (114a) of the worm (114), symmetrically with respect to the first nose (120) and the central longitudinal axis (L) of the worm (114), and wherein the worm (114) has a substantially radially extending fourth nose (128) at the second axial end section (114b) of the worm (114), symmetrically with respect to the second nose (122) and the central longitudinal axis (L) of the worm (114), the fourth nose (128) being configured to abut the third nose (126) at the first end stop (12a) of the steering spindle (12) and to abut the fourth nose (128) at the second end stop (12b) of the steering spindle (12). [4] Steering system (1), in particular a steer-by-wire steering system for a motor vehicle, comprising: a steering housing (10); a steering spindle (12, 112, 212, 312, 412) inserted at least partially into the steering housing (10) and rotatably mounted therein; a worm (14, 114, 214, 314, 414) mounted non-rotatably on the steering spindle (12, 112, 212, 312, 412), on whose outer surface (14c, 114c, 214c, 314c, 414c) a spiral groove (16, 116, 216, 316, 416) is formed; a guide pin (18, 118, 218, 318, 418) arranged on the steering housing (10), which is inserted at least partially into the spiral groove (16, 116, 216, 316, 416), wherein the spiral groove (16, 116, 216, 316, 416) of the worm (14, 114, 214, 314, 414) is guideable on the guide pin (18, 118, 218, 318, 418) when the worm (14, 114, 214, 314, 414) rotates due to rotation of the steering spindle (12, 112, 212, 312, 412) and is guided on the guide pin (18, 118, 218, 318, 418) by guidance on the guide pin (18, 118, 218, 318, 418) is axially displaceable, wherein a first end stop (12a, 112a, 212a, 312a, 416a) of the steering spindle (12, 112, 212, 312, 412) is provided at or adjacent to a first end section (16a, 116a, 216a, 316a, 416) of the helical groove (16, 116, 216, 316, 416) in a first direction of rotation (R1) of the steering spindle (12, 112, 212, 312, 412), wherein a first end stop (12a, 112a, 212a, 312a, 412a) of the steering spindle (12, 112, 212, 312, 412) is provided at or adjacent to a second end section (16b, 116b, 216b, 316b, 416b) of the helical groove (16, 116, 216, 316, 416) 216, 316,416) a second end stop (12b, 112b, 212b, 312b, 412b) of the steering spindle (12, 112, 212, 312, 412) in a second direction of rotation (R2) of the steering spindle (12, 112, 212, 312, 412) is provided, , characterized by, that the worm (214) has a substantially radially extending first nose (220) at a first axial end section (214a), wherein the worm (214) has a substantially radially extending further nose (222) at the first axial end section (214a) of the worm (214) symmetrically to the first nose (220) with respect to the central longitudinal axis (L) of the worm (214), wherein a first stop pin (224) is arranged on the steering housing (10) symmetrically to the guide pin (218) with respect to the central longitudinal axis (L) of the worm (214), wherein a second stop pin (226) is arranged on the steering housing (10) axially offset from the guide pin (218), and wherein a third stop pin (228) is arranged on the steering housing (10) axially offset from the first stop pin (224). [5] Steering system according to claim 4, characterized by, that the nose (220) and the further nose (222) of the worm gear (214) are arranged such that at the first end stop (212a) of the steering spindle (212) the nose (220) abuts the guide pin (218) and the further nose (222) simultaneously abuts the first stop pin (224), and wherein at the second end stop (212b) of the steering spindle (212) the nose (220) abuts the second stop pin (226) and the further nose (222) simultaneously abuts the third stop pin (228), wherein the nose (220) is axially movable between the guide pin (218) and the second stop pin (226) and the further nose (222) is axially movable between the first stop pin (224) and the third stop pin (228). [6] Steering system according to any one of the preceding claims, characterized by, that the at least one guide pin (18) is designed as a stepped element, wherein the at least one guide pin (18) has a first section (18a) with a larger diameter and a second section (18b) with a smaller diameter, wherein the first section (18a) of larger diameter is connected to the housing (10), and wherein the second section (18b) of smaller diameter is inserted into the spiral groove (16) of the screw (14). [7] Steering system according to any one of the preceding claims, characterized by , that the guide pin (18) is connected to the steering housing (10) or is integrally formed with the steering housing (10), wherein the worm (14) has an opening (30) formed along its central longitudinal axis (L) for receiving the steering spindle (12), wherein guide elements (32a, 32b) are arranged in the longitudinal direction of the opening (30), on which the worm (14) is linearly displaceable on the steering spindle (12). [8] Steering system according to any one of the preceding claims, characterized by that the worm (14) is connected to the steering spindle (12) by a rotary damper (34), wherein the rotary damper (34) has a first damping element (34a) arranged on the steering spindle (12) and rotationally fixed to the steering spindle (12), wherein the first damping element (34a) is made of an elastic material, preferably an elastomer, and has external teeth (34a1), and wherein the rotary damper (34) has a second damping element (34b) arranged on an inner circumference of the worm (14) and rotationally fixed to the worm (14), wherein the second damping element (34b) is made of an elastic material, preferably an elastomer, and has internal teeth (34b1), wherein the external teeth (34a1) of the first damping element (34a) mesh with the internal teeth (34b1) of the second damping element (34b) is in intervention. [9] Steering system (1), in particular a steer-by-wire steering system for a motor vehicle, comprising: a steering housing (10); a steering spindle (512) inserted at least partially into the steering housing (10) and rotatably mounted in it; a worm (514) which is rotatably mounted on the steering housing (10) and axially displaceable, wherein the worm (514) has a cylindrical opening (536) along its central longitudinal axis (L) into which the steering spindle (512) is inserted, wherein a spiral groove (516) is formed on an inner surface of the cylindrical opening (536) of the worm (514); a guide pin (518) arranged on the steering spindle (512), which is inserted at least partially into the spiral groove (516), wherein the worm (514) is axially movable by the spiral groove (516) when the guide pin (518) rotates due to rotation of the steering spindle (512), wherein a first end stop (512a) of the steering spindle (512) is provided at or adjacent to a first end section (516a) of the spiral groove (516) in a first direction of rotation (R1) of the steering spindle (512), and wherein a second end stop (512b) of the steering spindle (512) is provided at or adjacent to a second end section (516b) of the spiral groove (516) in a second direction of rotation (R2) of the steering spindle (512). [10] Steering system according to claim 9, characterized by, that the worm (514) has a substantially radially extending first nose (520) at a first axial end section (514a) and a substantially radially extending second nose (522) at a second axial end section (514b), wherein the guide pin (518) is configured to strike the first nose (520) at the first end stop (512a) of the steering spindle (512) and to strike the second nose (522) at the second end stop (512b) of the steering spindle (512). [11] Steering system according to claim 10, characterized by, that a stop pin (524) is arranged on the steering spindle (512) symmetrically to the guide pin (518) with respect to a central longitudinal axis (L) of the worm (514), wherein the worm (514) has a substantially radially extending third nose (526) at the first axial end section (514a) of the worm (514) symmetrically to the first nose (520) with respect to the central longitudinal axis (L) of the worm (514), and wherein the worm (514) has a substantially radially extending fourth nose (528) at the second axial end section (514b) of the worm (514) symmetrically to the second nose (522) with respect to the central longitudinal axis (L) of the worm (514), wherein the stop pin (526) is configured to abut the third nose (526) at the first end stop (512a) of the steering spindle (512) and at to strike the second end stop (512b) of the steering spindle (512) against the fourth nose (528). [12] Steering system according to any one of the preceding claims, characterized by, that the spiral groove (16, 116, 216, 316, 416, 516) is designed such that the screw (14, 114, 214, 314, 414, 514) is linearly displaceable when the screw (14, 114, 214, 314, 414, 514) is rotated, wherein the pitch of the spiral groove (16, 116, 216, 316, 416, 516) is greater at the respective end sections. [13] Steering system according to any one of the preceding claims, characterized by , that the screw (14, 114, 214, 314, 414, 514) is made of metal, in particular aluminium, or of plastic, and wherein the noses are made of metal, in particular aluminium, or of plastic, in particular preferably at least partially of elastomer, as fiber-reinforced plastic or as a plastic-molded metal pin.

Images