TWI634271B - Bearing clearance adjusting device for coaxially rotating component and rotatably mounted device for bicycle body - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention is directed to a device for adjusting bearing clearances of coaxially rotatably mounted members that are rotatably coupled to each other via two rolling bearings (4, 5, 14, 15) that are axially spaced from one another. The device is operatively connected to one of the two rolling bearings (5, 15) on the front end side and to the pedestal on the other end side.

The device of the present invention consists of a screw ring (30) and a pressure ring (31) which are coaxially disposed on one of the members. Each of the front end sides facing each other has at least one contour (32, 33) protruding from the plane of the front end face. At least one of the contours (32) is assigned a slope on which the at least one pair of contours (33) slide. The screw ring (30) is operatively connected to the support by its other front end face, and the pressure ring (31) is operatively connected to the rolling bearing (4, 5, 14, 15). The screw ring (30) and the pressure ring (31) are provided with a manner of mutually twisting each other and a pressure ring (31) for restraining the axial movement at the axial position taken.

Description

Bearing clearance adjusting device for coaxially rotating component and rotatably mounted device of bicycle hub

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a device for adjusting a bearing clearance of a coaxially rotatably mounted member, such as a shaft (Achsen) in a hub or in a casing, according to the type cited in the first application of the patent application. The shaft (Wellen), and a combination of members of the coaxial coaxially mounted member according to the quotation of the ninth application of the patent application.

The device for adjusting the bearing clearance is a long-standing skill. Usually it is a single adjustment via the pre-force path. The desired pre-force can be adjusted by means of a tolerance-adapting disc, an intermediate ring or a spacer ring. This kind of gap adjustment is cumbersome because the bearing clearance must be measured beforehand to select the suitable disc or ring. If the bearing clearance is not measured, it can only be tried with different accommodating discs or rings, which is often very time consuming, since replacing the accommodating disc or ring must remove the component together with the bearing from the holder or casing in which it is mounted.

There have been methods in the prior art for generating an adjustment force on a direct path, such as via a locking adjustment nut or a locking cone. During this time, the adjusting nut presses the retaining ring of the rolling bearing or the cone seat presses the rolling bearing and is in position It is fixed with a lock nut. Both tools are always required for this purpose. In addition, when the lock nut is tightened, the adjustment nut or the cone seat is rotated slightly by the adjusted position, so that the gap is changed again, resulting in additional adjustment. The disadvantage is that the bearing clearance must first be adjusted before the components can be placed in the housing, frame, fork or frame. Vice versa, to change the gap, the component must be loosened beforehand.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a device for adjusting the bearing clearance of coaxially mounted members that are rotatably mounted, and for applying the force of the gap adjustment in a simple manner while the member is in the assembled state, and for adjustment.

The invention and its advantages

The apparatus of the present invention for adjusting the axial bearing clearance of coaxially rotatably mounted members, having the features of claim 1 of the prior art, has the advantage over the prior art that the reduction of bearing clearance can be achieved in a simple manner And adjustment, and can apply force to the bearing in a simple way to generate pre-force, and once an axial force is set, it can be properly maintained. The operation of the device can be done in a simple manner using only a single tool. A particular advantage is that the device can be integrated into a complete pre-assembled component group consisting of coaxially mounted components and their receptacles, such as a housing, a frame, a vehicle fork or a vehicle frame. The configuration is such that not only the gap adjustment can be made in a pre-assembled state, but also the gap adjustment can be made in a combination in which all components are in a waiting state, that is, immediately available or immediately walkable.

The method is such that the device is composed of two coaxially disposed but relatively twistable rings, and the two rings are in contact with each other through the outer front end surface and the support formed by the casing, the frame, the frame or the fork frame. The front end of the other ring is operatively connected to one of the rolling bearings. The front end faces of the two rings are adjacent to each other with a contour of the planar projection of the front end surface, and at least one of the contours has a slope surface, and at least one pair of surface contours slides on the slope surface when one ring is twisted relative to the other ring. In order for the two rings to be relatively twisted, both have appropriate methods. A ring that is operatively coupled to the rolling bearing acts on each of the stationary components of the rolling bearing. In order to allow the two rings to be relatively radially twisted, the preferred method is that one of the rings has a seat and the other ring has an adjustment mechanism. A stop element that protrudes from the front end face of a ring is used as a support. Corresponding to this, the opposite ring has an adjustment mechanism. For this purpose, the ring to be described later has a recess, and the stop element of the ring described above protrudes into the recessed air. The recess is expanded in the circumferential direction of the ring, and an adjusting element projects into the recess in a substantially tangential to slight oblique direction, which can move and be restrained against the blocking element of the aforementioned ring.

It is particularly advantageous that the present invention can be used for gap adjustment of a bicycle wheel hub bearing. The gap adjustment is made on a fixed wheel that has been built into the fork or frame. The advantage here is also that the device is extremely small, compact and lightweight, and is suitable for being carried because it is mounted on the shaft between the fork frame or the frame arm and an outer rolling bearing, and does not exceed the diameter. Spoke flange.

The invention can also be advantageously used to adjust bearing clearances on a rotating shaft, such as a spindle of a machine tool.

The bearing clearance adjustment device can be located anywhere between the support and one of the two rolling bearings. This results in a design freedom in the bearing design and design of the overall component group. Advantageously, the adjustment device is located in a position that is easily accessible in the assembled component group.

In an advantageous embodiment of the invention, the ring which is operatively connected to the rolling bearing has a stop element which projects axially from its front end face. Correspondingly, the opposite ring to which the support is operatively connected is provided with an adjustment mechanism. For this purpose, the ring to be described later has a recess, and the stop element of the ring, which is operatively connected to the rolling bearing, projects into the recess. The recess is enlarged in the circumferential direction of the ring, and the adjusting element enters the recess in a substantially tangential to slightly inclined manner, which can move and be restrained against the blocking element of the aforementioned ring. Thereby, the ring with the adjustment mechanism is further away from the rolling bearing, making it easier for a tool to contact to adjust the bearing clearance.

According to one embodiment of the invention, the stop element is a pin and the adjustment element is an adjustment screw, which results in a space-saving and compact construction.

According to a further advantageous refinement of the invention, the ring containing the adjustment element is made of a polymeric material. This allows the adjustment device to be produced in particular at an appropriate cost via injection molding. An adjustment screw made of a polymeric material can have a self-locking thread in a simple manner, without the need for additional adjustment screws for insurance.

According to a further advantageous refinement of the invention, the ring, which is operatively connected to the rolling bearing, has an inner seal on the inner circumference of the front end which follows the rolling bearing and an outer seal on the outer circumference of the front end face. By this, The ring simultaneously becomes the primary seal of the rolling bearing, while the inner seal is then placed on the inner ring of the rolling bearing and the outer seal is then placed on the outer ring of the rolling bearing, ensuring an excellent bearing seal overall. The seal can be placed in or projected onto the ring. Injection molded seals have particular advantages in manufacturing when using polymeric materials for the rings.

According to a particularly advantageous embodiment of the invention, the ring, which is operatively connected to the rolling bearing, acts on the conical inner ring of the rolling bearing via an axially slidable cone. As a result, the static axial pre-force and the dynamically occurring operating force are not in the axial direction but in the radial direction. How many parts become axial loads depends on the angle of the two front and rear tapers. Exceeding a certain angle relationship, which depends on the friction coefficient of the two friction partners, a self-locking effect occurs, whereby no axial component force acts on the pressure ring at all, although the inner ring has an axial load. This represents an advantage because the bearing clearance adjustment device can only be loaded with axial force in a certain amount in accordance with various embodiments and the operational forces that occur. When there is no or only a small amount of operating force acting on the bearing gap adjusting device according to various designs, the bearing gap adjusting device can also be reduced in overall size. It is particularly advantageous if the pressure ring in this embodiment is made of a plastic material.

In a further advantageous embodiment of the invention, the ring, which is operatively connected to the roller bearing, is in direct contact with the ball of the roller bearing. For this purpose, the front end of the ring facing the rolling bearing has an operating track for the balls of the rolling bearing. This embodiment provides a particularly simple and thus cost-effective bearing clearance adjustment for a rolling bearing without an inner ring.

The remaining advantageous design and other advantages of the present invention are as follows Ming, patent claims, and drawings.

1‧‧‧ Front hub body

2‧‧‧Front spoke flange

3‧‧‧left spoke flange

4‧‧‧Right ball bearing

5‧‧‧left ball bearing

6‧‧‧ hollow shaft

7‧‧‧right end cap

8‧‧‧left end cap

9‧‧‧ Bearing clearance adjustment Front hub

11‧‧‧ Rear hub body

12‧‧‧Front spoke flange

13‧‧‧left spoke flange

14‧‧‧Right ball bearing

15‧‧‧left ball bearing

16‧‧‧ hollow shaft

17‧‧‧ Free moving body

18‧‧‧ toothed disc

19‧‧‧Right free-motion bearing

20‧‧‧ Left free-wheel bearing

21‧‧‧Interval spacer

22‧‧‧Outer spacer sleeve

23‧‧‧ spacer sleeve

24‧‧‧Clamping ring

25‧‧‧right end cap

26‧‧‧left end cap

27‧‧‧ Bearing clearance adjustment rear hub

28‧‧‧Power flow

30‧‧‧ screw ring

31‧‧‧ Pressure ring

32‧‧‧ contour

33‧‧‧ contour

34‧‧‧ hollow

35‧‧‧ hole

36‧‧‧Adjustment screws

37‧‧ ‧ sales

38‧‧‧ inner seal

39‧‧‧Lip seal

The apparatus for adjusting the axial clearance of the present invention is shown as an example of a front wheel hub and a rear hub of a bicycle, and will be described in detail later. The figure shows: Figure 1: A half-sectional view of the hub in space before a bicycle, with the device of the invention built in to adjust the axial bearing clearance, Figure 2: Half-section of the hub in space after a bicycle , having the device of the invention built therein for adjusting the axial bearing clearance, FIG. 3: an exploded perspective view of the device for adjusting the axial bearing clearance, the line of sight falling on the screw ring following the support, FIG. 4 The assembly drawing is shown in a half-sectional view in space, and the exploded view of the device of Figure 5, with the line of sight falling on the pressure ring following the rolling bearing.

1 shows a front hub of a bicycle, which is composed of a hub body and a hollow shaft. The hub body 1 has a spoke flange 2, 3 on the right side and a left side of the traveling direction, and the hollow shaft 6 is provided by a right side and a left side. The ball bearings 4, 5 are mounted in the hub body 1. The ball bearing 4 is pressed with its outer ring into the region of the right spoke flange 2 in the hub body 1. The left ball bearing 5 is pressed with its outer ring into an axially guided area via the left spoke flange 3, and the hollow shaft 6 is passed through A slide is connected to the inner ring of each of the ball bearings 4, 5. The hollow shaft 6 has an end cover 7, 8 on both sides, and the right end The cover 7 is screwed onto the hollow shaft 6, and the left end cover 8 is pressed or adhered to the hollow shaft 6. The bearing gap adjustment 9 device of the present invention interposed between the left end cap 8 and the left ball bearing 5 is pushed into the hollow shaft 6.

2 shows a bicycle rear wheel hub, which is composed of a hub body and a hollow shaft. The hub body 11 has a spoke flange 12, 13 on the right side and a left side of the traveling direction, and the hollow shaft 16 has a right side and a The left ball bearings 14, 15 are mounted in the hub body 11. The right ball bearing 14 is pressed with its outer ring into the region of the right spoke flange 12 in the hub body 11, and the left ball bearing 15 is pressed with its outer ring into an axially directed region via the left spoke flange 13 and the hollow shaft 16 It is connected to the inner ring of each of the ball bearings 14, 15 via a slide.

The drive side of the hub body 11, that is to say on the right side thereof, is connected to a free-moving body 17 in an anti-rotation manner in an axial direction in one direction, and a toothed disc 18 is provided on the end side before the two are opposed to each other. The free moving body 17 is mounted on the hollow shaft 16 via a right side and a left free moving body bearing 19, 20, where the hollow shaft accommodates the two inner rings in a sliding manner. Based on this, the two free-moving body bearings 19, 20 are axially mutually secured by an inner and an outer spacer sleeve 21, 22, and are sandwiched between the left free-wheeling bearing 20 and the right-hand ball bearing 14 of the hub body 11 The spacer sleeve 23 is axially secured in the hub body 11. The right free-moving body bearing 19 is axially secured by a clamping ring 24. A right side and a left end cover 25, 26 are provided on both sides of the hollow shaft 16, and the right end cover 25 is also screwed onto the hollow shaft 16, and the left side is pressed or adhered.

The bearing clearance adjustment 27 device of the present invention is also applied to the rear axle It is disposed between the left ball bearing 15 and the left end cover 26 of the hub body 11. The force flow between the two ball bearings 14, 15 is indicated in Figure 2 by a black hand-drawn line and assigned to the component symbol 28. It can be seen that in order to exert the function of the bearing gap adjustment 27, a spacer sleeve 23 disposed between the right ball bearing 14 and the left free movable bearing 20 and a space between the right and left free movable bearings 19 and 20 are required. The outer spacer sleeves 21, 22 conduct the pressure exerted by the bearing gap adjustment 27 on the left side ball bearing 15 to the right end end cap 25, so that the bearing clearance in the right side ball bearing 14 is also eliminated.

Since the structure and operation mode of the two bearing gap adjustments 9, 27 are the same, they will be collectively explained based on FIG. 3 to FIG. The function is to simply adjust the axial bearing clearance between the right and left ball bearings 4, 5 of the front hub and the manufacture and/or assembly between the right and left ball bearings 14, 15 of the rear hub.

As can be seen from FIG. 3 to FIG. 5, the bearing gap adjustments 9, 27 of the present invention are composed of a screw ring 30 and a pressure ring 31, which are coaxially mounted and have an inner diameter which makes it easy to slide over the hollow shaft 6 and 16 on. The front faces adjacent to each other have two contours 32, 33 projecting from their annulus, which in this case are formed as wedge-shaped projections, and the contour 33 of the pressure ring 31 is arranged differently from the contour 32 of the complementary screw ring 30. The contour 32 of the screw ring 30 is received by the recesses of the complementary pressure ring 31, and vice versa, the contour 33 of the pressure ring 31 is received by the recesses of the complementary screw ring 30. In this position, the bearing clearance adjustments 9, 27 have their minimum axial dimensions (thickness) as shown in Figures 1 and 2 in the assembled state of the front and rear hubs. At the same time, it is worth noting that the screw ring 30 completely surrounds the pressure ring 31 with its waist surface. Straight to the outer front end side so that the faces 32, 33 which slide against each other in a relative movement between the screw ring 30 and the pressure ring 31 are protected from fouling (Fig. 4).

As can be seen from Fig. 5, the ring space of the screw ring 30 has an arcuately extending recess 34 into which a hole 35, which is formed by the outer circumference of the screw ring, passes tangentially. An adjustment screw 36 can be screwed into this hole 35. If the screw ring 30 of the previous example is made of a plastic, the hole 35 does not need to be threaded. The adjusting screw 36 has a self-cutting thread which additionally has a self-locking capability so that the adjusting screw 36 does not loosen by itself. If a stiffer material is used to make the screw ring 30, such as metal or ceramic, the hole 35 must be designed as a threaded hole or have other adjustments that allow for axial travel into the recess 34. The safety of the adjustment screw 36 in the embodiment is by conventional means such as a self-locking thread or a locking nut.

As can be seen from Figures 3 and 5, the pressure ring 31 has a pin 37 extending axially from the front end face, and in the assembled state of the pressure ring 31 and the screw ring 30, the pin projects into the recess 34 of the screw ring.

As can be seen from the view shown in Fig. 5, the pressure ring 31 is then on the front end side of each of the left and right ball bearings 5, 15 of the front and rear hubs, and the bearing clearance adjustments in the assembled state shown in Fig. 4, The half cross-sectional view shows the inner seal 38 that is projected on the inner diameter of the pressure ring 31, which is in the built-in state of the bearing clearance adjustments 9, 27 (Figs. 1 and 2), respectively, followed by the left ball bearings 5, 15 Inside the ring. A lip seal 39 that is projected on the front end side of the pressure ring 31 and extends toward the outer periphery thereof seals the outer rings of the left ball bearings 5, 15 each. Two dense The seals 38, 39 have blocked most of the foreign contaminants from invading the left ball bearings 5, 15, so that the seals of the ball bearings 5, 15 need only be insulated from the smaller particles so that they cannot penetrate the bearings. internal.

The assembly and function of the apparatus for adjusting the axial bearing clearance of the present invention will be further explained below.

As can be seen from Figures 1 and 2, and as mentioned above, the bearing clearance adjustments 9, 27 are each mounted between the left end caps 8, 26 and the left side ball bearings 5, 15 on the same side, each of the pressure rings 31 It is then placed on the inner ring of the ball bearings 5, 15. Where a ball bearing without an inner ring is used, the pressure ring 31 is directly attached to the ball. For this purpose, the front end face has a running track, for example in the form of a tight cone. Obviously, the bearing clearance adjustments 9 can also be provided on the right side of the hub, but on the rear hub, the difficulty is higher than that on the front hub due to the limited construction space. In this case, the left end cap 8 is screwed onto the hollow shaft 6, and the right end cap 7 is fitted or glued as a press seat. However, the following description of the assembly and function is only for the combination shown in the embodiment of FIGS. 1 and 2, and is disposed on the left side of the traveling direction of the vehicle.

First, the left end caps 8, 26 are adhered to the hollow shafts 6, 16, after which the bearing gap adjustments 9, 27 are pushed onto the hollow shaft, and then the pre-assembled component sets are pushed into the loaded ball bearings 4, 5, 14, 15 hub body 1, 11. Finally, the right end caps 7, 25 are screwed. The front or rear wheel is then placed in the yoke or frame and secured in the yoke or frame in a quick clip or other conventional manner. In the state in which the mounted wheel is thus completed, the bicycle fork and the arm of the frame are pressed against the screw ring 30 via the left end caps 8, 26, so that the arm becomes The support of the screw ring 30. Finally, only the adjusting screw 36 is screwed on the screw ring 30, and the recess 34 is inserted as far as possible until the adjusting screw abuts against the pin 37 of the pressure ring. If the adjustment screw 36 is continued to be screwed, the pressure ring 31 moves against the hollow shafts 6, 16 causing the profiles 32, 33 to slide against each other, so that the pressure ring axially presses the inner ring of the left ball bearings 5, 15. Thereby, the ball bearings 5, 15 are axially loaded, and a force flow is generated between the running tracks of the inner ring, the balls and the outer ring.

The balls of the ball bearings 4, 14 located on the right side flow in the same manner via the force passing through the hub bodies 1, 11 to the right end caps 7, 25 screwed to the hollow shafts 6, 16 to press the right ball bearings 4, 14 The running track of the outer ring is such that the gap between the respective ball bearings 4, 5, 14, 15 tends to zero. Under the continued rotation of the adjustment screw 36, the interior of the ball bearings 4, 5, 14, 15 produces a predetermined pre-stress, also referred to as a negative clearance.

The combination of the screw ring 30 and the pressure ring 31 can also be interchanged, that is, the adjustment screw 36 is located on the ring of the ball bearings 4, 5, 14, 15 and the ring on the support has a recess that protrudes into the screw ring 30. Empty 34 sales 37.

All of the features described herein can be combined individually or in any combination with the inventive nature.

Claims (16)

A bearing clearance adjusting device for coaxially rotating members, the members being rotatably connected to each other via two rolling bearings (4, 5, 14, 15) mounted axially to each other, wherein a member is received by a receiver , for example, by a housing, a frame, a vehicle frame or a vehicle fork, and wherein the device is operatively coupled to one of the two rolling bearings (5, 15) with a front end side and applies an axial pressure to the rolling bearing ( In one of 4, 5, 14, and 15), the device is composed of a screw ring (30) and a pressure ring (31), and the two rings are coaxially disposed on the member connected to the receiver, and are mutually facing each other. One of the front end faces each having at least one of the contours (32, 33) protruding from the plane of the front end face, and at least one of the contours (32) has a slope on which the at least one pair of vertical profiles (33) slide, And the screw ring (30) and the pressure ring (31) are provided with a relative radial torsion, so that the pressure ring (31) can be axially moved in the direction of the rolling bearing (4, 5, 14, 15) each time. And providing the pressure ring (31) for restraining the axial movement at the axial position taken, In the method of twisting, the screw ring (30) or the pressure ring (31) has a pin (37) axially protruding from a front end surface thereof, and the pressure ring (31) or the screw ring (30) has a a recess (34), the pin (37) protruding into the recess, wherein the recess (34) becomes larger in the circumferential direction of the screw ring (30) or the pressure ring (31), and an adjusting screw (36) Basically tangential to slightly inclined a recess (34), the adjusting screw pair pin (37) is movable and restrainable, characterized in that the screw ring (30) remote from the rolling bearing (4, 5, 14, 15) is axially movable in an assembled state. The device is mounted on a member that is coupled to the receiver and has its other front end face attached to the holder of the member, and the receptacle of the screw ring (30) constitutes a seat. The device according to claim 1, wherein the support is formed by a casing, a frame, a vehicle fork or a vehicle frame, and the rolling bearing (4, 5, 14, 15) is fixed. The assembly is connected to the support. The device according to claim 1, characterized in that the support is constituted by an end cover (7, 8, 25, 26) fixedly mounted on the bicycle axle (6, 16), the rolling bearing (4) The fixing components of 5, 14, 15) are connected to the support. The device according to the first, second or third aspect of the patent application, characterized in that the pressure ring (31) operatively connected to the rolling bearing (4, 5, 14, 15) has a front end surface protruding therefrom The pin (37), and the oppositely disposed screw ring (30) connected to the receiver has a recess (34) and an adjusting screw (36). According to the device described in claim 4, It is characterized in that the blocking element is a pin (37) and the adjusting element is an adjusting screw (36). The device according to the first aspect of the invention is characterized in that the screw ring (30) for accommodating the adjusting screw is made of a polymeric material. The device according to claim 5, characterized in that the adjusting screw (36) has a self-locking thread. The device according to claim 1 is characterized in that the pressure ring (31) operatively connected to the rolling bearing (4, 5, 14, 15) is followed by the rolling bearing (4, 5, 14, 15) The inner periphery of the front end face has an inner seal (38) and an outer seal (39) on the outer periphery of the front end face. The device according to claim 8 is characterized in that the inner seal (38) and the outer seal (39) are placed or ejected. The device according to claim 1 is characterized in that the pressure ring (31) operatively connected to the rolling bearing (5, 15) acts on the rolling bearing (5, 15) via an axially slidable cone. On the inner ring. According to the device described in claim 1 of the patent application, It is characterized in that the pressure ring (31) has a running track on the front end side of the rolling bearing (5, 15) for the balls of the rolling bearing (5, 15), and the running track is then on the ball. A device for rotatably mounting a hub body (1, 11) of a bicycle on a shaft (6, 16), which is mounted to maintain axial distance from each other in the hub body (1, 11) Rolling bearing (4, 5, 14, 15), wherein the shaft (6, 16) can be firmly clamped in one of the bicycles or a frame, and in one of the two rolling bearings (4, 5, 14, 15) A device is provided between the fork frame and/or the arm adjacent to the frame for adjusting the axial bearing clearance of the rolling bearing (4, 5, 14, 15), hereinafter referred to as bearing clearance adjustment, which applies an axis The bearing pressure is on the rolling bearing (4, 5, 14, 15), characterized in that the bearing clearance adjustment (9, 27) is composed of a screw ring (30) and a pressure ring (31), which are adjacent coaxial Provided on the shafts (6, 16) and axially movable, the front end faces each having at least one of the contours (32, 33) protruding from the plane of the front end surface and at least one of the contours (32) having a slope surface. The at least one pair of contours (33) slide on the slope surface, wherein the screw ring (30) is in operative contact with the bicycle yoke or frame with its other front end surface, and the pressure ring (31) is Rolling (4,5,14,15) acts in contact, and The screw ring (30) and the pressure ring (31) are provided with a relative radial torsion so that the pressure ring (31) moves axially in the direction of the rolling bearing (4, 5, 14, 15), and the method is provided. A pressure ring (31) that constrains axial movement at the axial position taken. The apparatus according to claim 12, characterized in that, as a method of twisting, the pressure ring (31) has a pin (37) protruding axially from a front end surface thereof, and the screw ring (30) has a recess (34), the pin (37) protruding into the recess, wherein the recess (34) becomes larger in the circumferential direction of the screw ring (30), and an adjusting screw (36) is substantially tangent to a slight inclination The manner extends into the recess (34), the adjusting screw being movable and constrainable to the pin (37). The device according to claim 12 or 13, wherein the screw ring (30) is fixedly disposed on the end cover (7, 8) of the shaft (6, 16) with its other front end face. 25, 26) Connected to the fork frame or frame of the bicycle. The apparatus according to claim 12 or 13, characterized in that the bearing gap adjustment (9, 27) is a pressure ring (31) which is in contact with the rolling bearing (4, 5, 14, 15) Actuated on the inner ring of the rolling bearing (4, 5, 14, 15) via an axially slidable cone. The device according to claim 12 or 13, characterized in that the pressure ring (31) in operative contact with the rolling bearing (4, 5, 14, 15) is followed by the rolling bearing (4, 5) And 14, 15) having an inner seal (38) on the inner periphery of the upper end face and an outer seal (39) on the outer periphery of the front end face.