Linear bearing unit with a sound insulation device

Abstract

Linear bearing unit (2, 19), comprising a linear bearing (5) with a first and a second end face (7, 8) and a through-opening (9) extending from the first end face (7) to the second end face (8) for guiding a shaft (3) through it and a sound insulation device (6, 20), which includes a sound insulation element (11) arranged on one of the two end faces (7, 8) of the linear bearing (5), characterized in that the sound insulation device has a sound insulation housing (21) with a stepped cavity in which the linear bearing (5) and the sound insulation element (11) are arranged.

Description

[0001] The invention relates to a linear bearing unit comprising a linear bearing with a first and a second end face and a through-opening extending from the first end face to the second end face for guiding a shaft through it. The invention further relates to a linear bearing system with such a linear bearing unit and a fitness device with at least one such linear bearing unit.

[0002] Linear bearings, especially linear ball bearings, are used in various technical fields to guide a component along a shaft with minimal friction. For example, linear bearings are used for this purpose in fitness equipment.

[0003] During operation of a device equipped with a linear bearing, operating noises can occur due to the relative movement between the linear bearing and the shaft. These noises may be undesirable depending on the application and environmental conditions. With linear ball bearings, such operating noises are often perceived as a slight sawing or rattling sound and are primarily attributable to the collision of the rotating balls within the linear bearing.

[0004] One approach to reducing operating noise in a device equipped with a linear bearing is to use lubricants with noise-reducing properties to lubricate the linear bearing. However, in some applications, this does not achieve a sufficiently strong reduction in operating noise to meet the specific requirements.

[0005] For example, DE 699 23 037 T2 discloses a linear guide unit with a lubricating disc arranged in a housing with an end seal. Similarly, JP 2008 215 482 A discloses a sliding bearing with a lubricant dispenser arranged in an end section of a cylindrical body. DE 10 2014 219 703 A1 relates to a device for lubricating a guide rail of a linear guide system, wherein the device has a holding device with a receptacle for a lubricant metering element and / or a lubricant reservoir.

[0006] DE 10 2011 017 759 A1, on the other hand, discloses a cover for receiving a profile rail wagon in an interior of the cover.

[0007] A universal weight frame for fitness and health equipment is known from DE 200 02 403 U1.

[0008] One object of the present invention is to enable an effective reduction of operating noise in a device equipped with one or more linear bearings.

[0009] This problem is solved according to the invention by a linear bearing unit according to claim 1, by a linear bearing system according to claim 12 and by a fitness device according to claim 15.

[0010] Preferred embodiments of the invention are specified in the further claims and in the following description.

[0011] The linear bearing unit according to the invention comprises a linear bearing with a first and a second end face and a through-opening extending from the first end face to the second end face for guiding a shaft through it. Furthermore, the linear bearing unit according to the invention is equipped with a sound insulation device, which includes a sound-insulating element arranged on one of the two end faces of the linear bearing.

[0012] The invention is based on the finding that operating noises arising from relative movement between the shaft and the linear bearing originate inside the linear bearing, with sound waves in the form of airborne sound spreading directly through the through-hole of the linear bearing into the environment and / or in the form of structure-borne sound from the linear bearing to adjacent components and from there into the environment.

[0013] The sound-insulating device, with its damping element positioned at the end face of the linear bearing, reduces the propagation of airborne and / or structure-borne noise into the surrounding area. Specifically, the damping element reduces the transmission of structure-borne noise from the linear bearing to an adjacent component via one of its end faces, and / or reduces the propagation of airborne noise from the linear bearing's through-hole.

[0014] The statement that the insulating body is "arranged on one of the two end faces of the linear bearing" does not necessarily mean that the insulating body is in contact with the linear bearing, or more precisely, with one of the two end faces of the linear bearing. Another element may optionally be positioned between the insulating body and the linear bearing. That is to say, the insulating body may, in particular, be arranged on one of the two end faces of the linear bearing with another element intermediately positioned between it and the linear bearing. In an alternative embodiment of the invention, however, it may be provided that the insulating body is in contact with the linear bearing, or more precisely, with one of the two end faces of the linear bearing.

[0015] The linear bearing of the linear bearing unit is preferably designed as a linear ball bearing. Linear ball bearings are characterized by particularly low frictional resistance and are therefore well suited for applications where particularly low-friction guidance of a component along a shaft is desired or required, as is often the case with fitness equipment, for example.

[0016] In a preferred embodiment of the invention, the insulating body is formed in one piece. Alternatively, the insulating body can consist of several individual parts, in particular several identical individual parts, which can, for example, be arranged adjacent to one another.

[0017] Furthermore, it is preferred that the insulating body has a through-opening for the shaft to pass through. The through-opening of the insulating body advantageously has a diameter that is at most as large as the diameter of the through-opening of the linear bearing. This allows the insulating body to enclose the shaft airtight, thereby particularly effectively reducing the propagation of airborne noise from the through-opening.

[0018] Advantageously, the insulating body is designed as a ring, in particular with a rectangular or square cross-sectional shape.

[0019] The insulating element can, for example, consist of or contain foam. Foam materials generally offer good sound insulation and are readily available at low cost. Alternatively, the insulating element can consist of or contain other insulating materials.

[0020] Furthermore, it is advantageous if the material from which the insulating body is made is elastic. This allows the insulating body to adapt the diameter of its through-hole to the diameter of the shaft.

[0021] Furthermore, it is advantageous if the insulating body is impregnated with a lubricant for lubricating the linear bearing. Preferably, the lubricant contained in the insulating body reaches the shaft during relative movement between the shaft and the linear bearing, and from there into the linear bearing. This lubricant provides additional lubrication of the linear bearing, which can further reduce operating noise. In this case, the linear bearing is preferably not equipped with seals so that the lubricant can enter the linear bearing unhindered.

[0022] Furthermore, the sound insulation device may include a damping body housing, in particular an annular damping body housing, within which the damping element is arranged and which has a through-opening for the shaft to pass through. Preferably, the damping body housing is in contact with the end face of the linear bearing on which the damping element is arranged. The damping body housing allows for easy mounting of the damping element in a larger housing that accommodates the linear bearing unit.

[0023] Advantageously, the insulating body's through-opening is not obstructed by the insulating body housing. This allows the insulating body to contact the shaft, sealing the linear bearing unit against the shaft and / or supplying the linear bearing with any lubricant contained within the insulating body via the shaft.

[0024] The insulating body housing can be multi-part, in particular two-part. For example, the insulating body housing can have a main housing part and a housing cover part. Preferably, the insulating body housing, with its housing cover part, is in contact with the end face of the linear bearing on which the insulating body is arranged.

[0025] In another design variant, the insulating body housing may be designed without a housing cover part, and the insulating body is in contact with the linear bearing on its side facing the linear bearing.

[0026] According to the invention, the sound insulation device comprises a sound-insulating housing, in particular a two-part sound-insulating housing, in which the linear bearing and the damping element are arranged and which has a through-opening for the shaft to pass through. The sound-insulating housing reduces the transmission of structure-borne noise from the linear bearing to a higher-level housing that accommodates the linear bearing unit.

[0027] Preferably, the soundproof housing is a plastic housing, particularly because of the generally good soundproofing properties of plastic.

[0028] In the embodiment in which the sound insulation device comprises the sound insulation housing, the insulating body is preferably in contact with an end face of the linear bearing with its side facing the linear bearing, while the insulating body is preferably in contact with an inner surface of the sound insulation housing with its side facing away from the linear bearing.

[0029] Furthermore, the linear bearing unit can include a force transmission element arranged between the sound-insulating housing and the linear bearing, which is preferably in contact with both the sound-insulating housing and the linear bearing. The force transmission element can be made of steel or, optionally, another metal. Advantageously, the force transmission element surrounds a section of the linear bearing. It is particularly preferred if the force transmission element is annular and encloses a section of the linear bearing around its circumference.

[0030] According to the invention, the sound-insulating housing has a stepped, preferably axially symmetrical, cavity. Several sections of the cavity can have different diameters. For example, one section of the cavity can have a diameter equal to the outer diameter of the linear bearing. Another section of the cavity can, for example, have a diameter equal to the outer diameter of the damping element. Yet another section of the cavity can have a diameter equal to the outer diameter of the force transmission element.

[0031] Optionally, the linear bearing unit can have a bearing housing in which the linear bearing and the sound insulation device are arranged. Advantageously, the bearing housing has a through-opening for the shaft to pass through. Preferably, the bearing housing is a metallic housing, in particular an aluminum housing.

[0032] The insulating housing, if present, may be pressed into the bearing housing. This means the insulating housing may be connected to the bearing housing by an interference fit.

[0033] In addition to the first-mentioned sound-insulating element, the sound-insulating device can include a further sound-insulating element. Advantageously, one of the two sound-insulating elements of the sound-insulating device is arranged on the first end face of the linear bearing, while the other is arranged on the second end face. This makes it possible to achieve the same benefits with the additional sound-insulating element on the opposite end face of the linear bearing as with the first-mentioned sound-insulating element. Furthermore, it is advantageous if the additional sound-insulating element has a through-opening for the shaft to pass through.

[0034] In particular, the first and the second insulation body may be identical in design. In this case, features mentioned above and / or below in connection with the first insulation body may apply analogously to the second insulation body.

[0035] The linear bearing system according to the invention comprises a linear bearing unit according to the invention and a shaft passing through the linear bearing unit. In the linear bearing system according to the invention, the damping element of the sound insulation device of the linear bearing unit provides an airtight enclosure for a section of the shaft around its circumference.

[0036] If the sound insulation device of the linear bearing unit has an optional additional insulating body in addition to its first-mentioned insulating body, it is preferred if the additional insulating body also encloses the shaft airtight around its circumference.

[0037] Advantageously, the insulating body of the sound-insulating device has a thickness in the axial direction of the shaft that corresponds to at least 5% of the shaft diameter, preferably at least 10% of the shaft diameter. Furthermore, it is advantageous if the insulating body of the sound-insulating device has a thickness in the radial direction of the shaft that corresponds to at least 5% of the shaft diameter, preferably at least 10% of the shaft diameter. With such dimensions of the insulating body, good sound insulation can be achieved.

[0038] Furthermore, the optional sound-insulating housing of the sound-insulating device can have a wall thickness in the radial direction of the shaft that corresponds to at least 2% of the shaft diameter, preferably at least 5% of the shaft diameter. In the axial direction of the shaft, the optional sound-insulating housing preferably has a wall thickness that corresponds to at least 2% of the shaft diameter, preferably at least 5% of the shaft diameter. With such dimensions of the sound-insulating housing, good sound insulation can be achieved.

[0039] Das erfindungsgemäße Fitnessgerät, bei dem es sich beispielsweise um eine Beinpresse handeln kann, umfasst mindestens eine erfindungsgemäße Linearlagereinheit oder mindestens ein erfindungsgemäßes Linearlagersystem.

[0040] The invention will now be explained in more detail with reference to figures illustrating exemplary embodiments. Where expedient, identical or equivalent elements are designated with the same reference numerals. The invention is not limited to the embodiments shown in the figures – not even with regard to functional features. The preceding description and the subsequent description of the figures contain numerous features, some of which are summarized in the dependent claims. However, those skilled in the art will also consider these features individually and combine them into meaningful further combinations. In particular, these features can each be combined individually and in any suitable combination with the linear bearing unit, the linear bearing system, and / or the fitness device according to the invention.

[0041] They show: Fig. 1 a perspective view of a linear bearing system comprising a linear bearing unit and a shaft passing through the linear bearing unit; Fig. 2 an exploded view of the linear bearing unit of the linear bearing system made of Fig. 1; Fig. 3 an exploded view of an insulating body and an insulating body housing of the linear bearing unit Fig. 2; Fig. 4 a perspective view of another linear bearing system comprising a linear bearing unit and a shaft passing through the linear bearing unit; Fig. 5 an exploded view of the shaft and the linear bearing unit of the linear bearing system Fig. 4; Fig. 6 a sectional view of the linear bearing unit of the linear bearing system made of Fig. 4, where the linear bearing of the linear bearing unit is not shown; Fig. 7 A schematic representation of a fitness device with multiple linear bearing units.

[0042] Fig. Figure 1 shows a perspective view of a first linear bearing system 1. This linear bearing system 1 comprises a linear bearing unit 2 and a shaft 3 passing through the linear bearing unit 2, along which the linear bearing unit 2 can be moved in a straight line.

[0043] In Fig. Figure 1 shows a bearing housing 4 of the linear bearing unit 2 and a part of the shaft 3 passing through the linear bearing unit 2 in a top-down oblique view. The bearing housing 4 is preferably a metallic housing, in particular an aluminum housing.

[0044] Fig. Figure 2 shows the linear bearing unit 2 of the linear bearing system 1. Fig. 1 in an exploded view. Unlike in Fig. 1, is in Fig. 2 not the top, but the underside of the bearing housing 4 of the linear bearing unit 2 is visible.

[0045] The linear bearing unit 2 comprises a linear bearing 5 and a sound insulation device 6. In the assembled state of the linear bearing unit 2 (see Fig. 1) The linear bearing 5 and the sound insulation device 6 are arranged inside the bearing housing 4.

[0046] In the present embodiment, the linear bearing 5 is a linear ball bearing, i.e., a linear bearing which has balls as rolling elements. Furthermore, the linear bearing 5 has a first end face 7, a second end face 8, and a through-opening 9 extending from the first end face 7 to the second end face 8.

[0047] The sound insulation device 6 comprises two identical, ring-shaped insulation body housings 10, in each of which a ring-shaped insulation body 11 is arranged for sound insulation (see figure). Fig. 3). In Fig. In Figure 1, one of the two damping body housings 10 is visible, with each of the two damping body housings 10 of the sound insulation device 6 being pressed into the bearing housing 4. In the assembled state of the linear bearing unit 2, one of the two damping body housings 10 is arranged on the first end face 7 of the linear bearing 5 and the other of the two damping body housings 10 is arranged on the second end face 8 of the linear bearing 5, with the two damping body housings 10 being in contact with the linear bearing 5, more precisely with its end faces 7, 8.

[0048] As from Fig. As can be seen in Figure 2, in addition to the linear bearing 5, the bearing housing 4 and the two insulating body housings 10 each include a through-opening 9 for the passage of the shaft 3.

[0049] Fig. Figure 3 shows an exploded view of one of the two soundproof housings 10 and of a soundproof element 11, which is arranged inside the soundproof housing 10 when the housing is assembled. Since the two soundproof housings 10 of the soundproofing device 6 are identical in construction and the soundproof elements 11 are identical in construction, the following explanations apply analogously to the other housing, in Fig. 3 insulation body housings not shown 10.

[0050] The in Fig. The insulation housing 10 shown in Figure 3 is designed in two parts. It comprises a main housing part 12 and a housing cover part 13. The former includes a side wall 14 with several recesses 15 and a bottom wall 16. The housing cover part 13 includes several radial projections 17 which, when the insulation housing 10 is assembled, engage in the recesses 15 of the side wall 14 of the main housing part 12.

[0051] As from Fig. As can be seen in Figure 3, the two aforementioned housing parts 12 and 13, as well as the insulating body 11, each have a through-opening 9 for the passage of the shaft 3. The diameter of the through-opening 9 of the insulating body 11 is selected such that the insulating body 11, in the assembled state of the linear bearing system 1 (see Figure 3), Fig. 1) encloses a section of the shaft 3 airtight around its circumference.

[0052] The insulating body 11 consists of a foam and has a rectangular cross-sectional shape. Its through-opening 9 is not covered by the insulating body housing 10. Furthermore, the insulating body 11 is impregnated with a lubricant for lubricating the linear bearing 5, which is introduced into the linear bearing 5 via the shaft 3 during relative movement between the shaft 3 and the linear bearing unit 2. In the axial direction of the shaft 3, the insulating body 11 has a thickness that corresponds to approximately 22% of the diameter of the shaft 3. In the radial direction of the shaft 3, the insulating body 11 has a thickness that corresponds to approximately 17% of the diameter of the shaft 3.

[0053] A further embodiment of the invention is described below. The same reference numerals are used as in the Fig. Reference numerals 1 to 3 are used to denote identical or corresponding elements of the exemplary embodiments. However, identical or corresponding elements of the exemplary embodiments may, if appropriate, be designated with different reference numerals.

[0054] Fig. Figure 4 shows a perspective view of a second linear bearing system 18. This linear bearing system 18 comprises a linear bearing unit 19 and a shaft 3 passing through the linear bearing unit 19, along which the linear bearing unit 19 can be moved in a straight line.

[0055] The linear bearing unit 19 of this linear bearing system 18 comprises a sound insulation device 20 with an axially symmetrical, multi-part sound insulation housing 21 made of plastic, which comprises two identical housing halves 22, 23. A linear bearing 5, in particular a linear bearing 5 designed as a linear ball bearing, is arranged within the sound insulation housing 21 (see figure). Fig. 5).

[0056] Optionally, the linear bearing unit 19 can comprise a bearing housing, in particular a metallic bearing housing, within which the sound-insulating housing 21 and the linear bearing 5 arranged therein can be located. Fig. 4 as well as in the Fig. 5 and Fig. Figure 6 does not show such an optional bearing housing.

[0057] Fig. Figure 5 shows an exploded view of the linear bearing system 18. Fig. 4.

[0058] In Fig. The previously mentioned linear bearing 5 of the linear bearing unit 19 of the linear bearing system 18 is visible. This has a first end face 7, a second end face 8 and a through-opening 9 extending from the first end face to the second end face for guiding the shaft 3 through it.

[0059] The sound-insulating housing 21 of the sound-insulating device 20 has a wall thickness in the axial direction of the shaft 3 that corresponds to approximately 30% of the diameter of the shaft 3, and in the radial direction of the shaft 3 a wall thickness that corresponds to approximately 14% of the diameter of the shaft 3.

[0060] Furthermore, in Fig. 5 Two further elements of the sound insulation device 20 of the linear bearing unit 19 are visible. These two further elements are two ring-shaped insulating bodies 11 for sound insulation.

[0061] In the assembled state of the linear bearing unit 19 (see Fig. 4) One of the two damping elements 11 is arranged on the first end face 7 of the linear bearing 5, and the other of the two damping elements 11 is arranged on the second end face 8 of the linear bearing 5. In this state, the respective damping element 11 is in contact with the linear bearing 5, more precisely with one of the end faces 7, 8 of the linear bearing 5, with its side facing the linear bearing 5, while the respective damping element 11 is in contact with an inner surface of one of the housing halves 22, 23 of the soundproof housing 21 with its side facing away from the linear bearing 5.

[0062] With regard to their other characteristics, the two insulating bodies 11 of the sound insulation device 20 correspond to the previously described insulating bodies 11 of the first linear bearing system 1 from the Fig. 1 to 3, so that in this regard reference is made to the above statements on the insulating bodies 11 of the first linear bearing system 1.

[0063] As from Fig. As can be seen in Figure 5, in addition to the linear bearing 5, the two housing halves 22, 23 of the soundproof housing 21 and the two insulating bodies 11 each have a through-opening 9 for the passage of the shaft 3.

[0064] The linear bearing unit 19 further comprises an annular force transmission element 24, which is preferably made of steel. In the assembled state of the linear bearing unit 19 (see Figure 1), Fig. 4) The force transmission element 24 is arranged between the sound-insulating housing 21 and the linear bearing 5, wherein the force transmission element 24 is in contact with the linear bearing 5 and the sound-insulating housing 21 and encloses a partial section of the linear bearing 5 around its circumference. The force transmission element 24, which enables force transmission from any (bearing) housing surrounding the linear bearing unit 19 to the linear bearing 5, advantageously has such strength that the linear bearing unit 19 does not deform during operation. This ensures consistent guiding accuracy of the linear bearing unit 19.

[0065] Fig. Figure 6 shows a sectional view of the linear bearing unit 19 of the linear bearing system 18. Fig. 4 and the shaft 3 passed through the linear bearing unit 19, wherein the linear bearing 5 of the linear bearing unit 19 Fig. However, number 6 is shown.

[0066] Out of Fig. Figure 6 shows that the soundproof housing 21 has a stepped cavity for receiving the linear bearing 5, the two damping elements 11, and the force transmission element 24. The cavity of the soundproof housing 21 has one section whose diameter corresponds to the outer diameter of the force transmission element 24. Furthermore, the cavity includes two sections whose diameters correspond to the outer diameter of the linear bearing 5, as well as two sections whose diameters correspond to the outer diameter of the damping elements 11.

[0067] Fig. Figure 7 shows a schematic representation of a fitness device 25, more precisely a leg press.

[0068] The fitness device 25 has a frame 26 and a footplate 27 attached to the frame 26. Furthermore, the fitness device 25 comprises two shafts 3 attached to the frame 26, arranged parallel to each other and positioned side by side, such that in Fig. 7 only one of the two shafts 3 is visible. Furthermore, the fitness device 25 includes a bearing housing 28 on each of the two shafts 3, in which two bearing units 29 are arranged one behind the other. In addition, the fitness device 25 has a seat 30, which is connected to the bearing housings 28 and can be moved along the shafts 3 by means of the bearing units 29.

[0069] The bearing units 29 of the fitness equipment 25 can, for example, be configured like the bearing unit 2 of the first linear bearing system 1 (see Fig. 1 to 3) shall be designed, in which case the bearing housing 28 of the fitness device 25 may be used instead of the one in the Fig. 1 and Fig. The bearing housing 4 shown in Figure 2 may be provided. Alternatively, the bearing units 29 of the fitness equipment 25 can be designed, for example, like the bearing unit 19 of the second linear bearing system 18 (see Figure 2). Fig. 4 to 6) be trained.

[0070] The invention has been described in detail with reference to the illustrated embodiments. However, the invention is not limited to or by the disclosed examples. Other variations can be derived by a person skilled in the art from these embodiments without departing from the underlying principles of the invention. Reference symbol list 1 linear bearing system 2 linear bearing units 3rd wave 4 bearing housings 5 linear bearings 6 Soundproofing device 7 Front 8 Front 9 Passage opening 10 Insulation Body Housings 11 Insulation bodies 12 Main housing part 13 Housing cover part 14 side wall 15 recess 16 Floor wall 17 lead 18 Linear bearing system 19 linear bearing units 20 Soundproofing device 21 soundproof housings 22 Housing half 23 Housing half 24 Power transmission element 25 fitness equipment 26 frames 27 tread surface 28 bearing housings 29 storage units 30 seats

Claims

[1] Linear bearing unit (2, 19) comprising a linear bearing (5) with a first and a second end face (7, 8) and a through opening (9) extending from the first end face (7) to the second end face (8) for guiding a shaft (3) through it and a sound insulation device (6, 20) comprising a sound insulation element (11) arranged on one of the two end faces (7, 8) of the linear bearing (5). characterized by , that the sound insulation device has a sound insulation housing (21) with a stepped cavity in which the linear bearing (5) and the insulating body (11) are arranged. [2] Linear bearing unit (2, 19) according to claim 1, characterized by , that the linear bearing (5) is designed as a linear ball bearing. [3] Linear bearing unit (2, 19) according to claim 1 or 2, characterized by, that the insulating body (11) has a through-opening (9) for passing the shaft (3) through and the through-opening (9) of the insulating body (11) has a diameter which is at most as large as the diameter of the through-opening (9) of the linear bearing (5). [4] Linear bearing unit (2, 19) according to one of the preceding claims, characterized by , that the insulating body (11) is designed as a ring. [5] Linear bearing unit (2, 19) according to one of the preceding claims, characterized by , that the insulating body (11) consists of or contains a foam. [6] Linear bearing unit (2, 19) according to one of the preceding claims, characterized by , that the insulating body (11) is impregnated with a lubricant for lubricating the linear bearing (5). [7] Linear bearing unit (2) according to one of the preceding claims, characterized by, that the sound insulation device (6) comprises an insulation body housing (10) within which the insulation body (11) is arranged and which has a through-opening (9) for passing the shaft (3) through it. [8] Linear bearing unit (19) according to one of the preceding claims, characterized by , that the soundproof housing (21) is designed in two parts and has a through-opening (9) for passing the shaft (3) through it. [9] Linear bearing unit (19) according to claim 8, characterized by a force transmission element (24) arranged between the sound insulation housing (21) and the linear bearing (5), wherein the force transmission element (24) surrounds a partial section of the linear bearing (5). [10] Linear bearing unit (2) according to any one of the preceding claims, characterized by a bearing housing (4) in which the linear bearing (5) and the sound insulation device (6) are arranged and which has a through-opening (9) for passing the shaft (3) through it. [11] Linear bearing unit (2, 19) according to one of the preceding claims, characterized by , that the sound insulation device (6, 20) comprises a further sound insulation body (11) which has a through-opening (9) for passing the shaft (3) through, wherein one of the two sound insulation bodies (11) of the sound insulation device (6, 20) is arranged on the first end face (7) of the linear bearing (5) and the other of the two sound insulation bodies (11) of the sound insulation device (6, 20) is arranged on the second end face (8) of the linear bearing (5). [12] Linear bearing system (1, 18) comprising a linear bearing unit (2, 19) according to one of the preceding claims and a shaft (3) passing through the linear bearing unit (2, 19), wherein the damping body (11) of the sound insulation device (6, 20) of the linear bearing unit (2, 19) encloses a partial section of the shaft (3) airtight around its circumference. [13] Linear bearing system (1, 18) according to claim 12, characterized by, that the insulating body (11) of the sound insulation device (6, 20) has a thickness in the axial direction of the shaft (3) that corresponds to at least 5% of the diameter of the shaft (3). [14] Linear bearing system (1, 18) according to claim 12 or 13, characterized by , that the insulating body (11) of the sound insulation device (6, 20) has a thickness in the radial direction of the shaft (3) that corresponds to at least 5% of the diameter of the shaft (3). [15] Fitness equipment (25), in particular leg press, with at least one linear bearing unit (2, 19) according to one of claims 1 to 11 or with at least one linear bearing system (1, 18) according to one of claims 12 to 14.

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