An embedded bearing positioning mechanism for motor end cover

Abstract

This utility model discloses an embedded bearing positioning mechanism for a motor end cover, including a housing, a fan inside the housing, the fan being fixedly connected to a rotating shaft, a bearing being sleeved on the rotating shaft and passing through the end cover. A positioning mechanism is set inside the end cover, including a detachable positioning element. The positioning element is embedded in the inner cavity of the end cover and has a positioning groove that mates with the outer ring of the bearing, so that the radial positioning and wear-resistant interface of the bearing outer ring are borne by the positioning groove. The positioning element has a spline, which meshes with the spline groove in the inner cavity of the end cover to restrict the rotation of the positioning element relative to the end cover. A spring is installed inside the inner cavity of the end cover, and the spring applies an axial restoring force to the positioning element, keeping the bearing axially fitted with the positioning groove to suppress axial movement. The rotating shaft has a retaining ring groove and a retaining ring forming an axial stop, which, together with the spring, constrains the bearing. The spring abuts against the base of the positioning element through a pressure plate to stabilize the force transmission. This structure reduces wear on the end cover mounting area, suppresses movement and abnormal noise, and facilitates maintenance and restoration to the assembly state.

Description

Technical Field

[0001] This utility model relates to the field of bearing assembly and positioning structure at motor end cover, and in particular to an embedded bearing positioning mechanism for motor end cover. Background Technology

[0002] A typical motor structure includes a housing, end cover, shaft, and fan. The shaft is supported by bearings and passes through the end cover to form a rotational support point. In long-term operation, the bearing mounting area at the end cover not only positions and bears the load of the bearing outer ring but also requires repeated disassembly and reassembly for maintenance, cleaning, rust removal, or component replacement. The mating surfaces between the bearing outer ring and the end cover mounting area are easily subjected to repeated stress during disassembly and reassembly. Wear on these surfaces can lead to loose assembly, unstable positioning, or difficulty in restoring the assembly to its original state. This, in turn, alters the shaft support condition, increases operating noise, and in severe cases, can damage the end cover mounting area, requiring replacement of the end cover or repair of the end cover holes, thus increasing maintenance costs.

[0003] Furthermore, to suppress axial movement of the shaft, existing structures often employ a snap ring groove on the shaft, along with the snap ring for axial restraint. However, during actual assembly and use, the axial fit of the bearing at the end cover can easily change due to disassembly, wear, and operational impacts. Residual clearance may appear between the axial restraint provided by the snap ring and the support surface on the end cover side, causing axial reciprocating movement of the shaft during operation. This movement can lead to abnormal noise and accelerate wear on the mating surfaces. Simultaneously, if the bearing outer ring exhibits a relative slippage tendency at the end cover mounting location, it can also cause increased heating and wear on the mating surfaces, further reducing positioning reliability.

[0004] Therefore, it is still necessary to provide a structure that can form a stable bearing outer ring positioning interface at the end cover and is easy to restore to the positioning state after repeated disassembly and maintenance, so that the end cover body is not easily damaged by disassembly and disassembly wear. At the same time, it can provide elastic compensation for the bearing axial clearance to suppress axial movement and limit the rotation of the positioning component to reduce wear and noise caused by relative slippage of the outer ring. Utility Model Content

[0005] The technical problem to be solved by this utility model is to achieve stable positioning and wear-resistant bearing of the bearing outer ring at the motor end cover, and reduce the wear risk of the end cover seat hole caused by disassembly and assembly without changing the external mounting interface of the end cover, while reducing axial movement and abnormal noise caused by bearing axial looseness, thereby improving operational stability and reducing maintenance costs.

[0006] To achieve the above objectives, this utility model provides a motor end cover embedded bearing positioning mechanism, including a housing, a fan housed inside the housing, the fan being fixedly connected to a rotating shaft, a bearing being sleeved on the rotating shaft, and the rotating shaft passing through the end cover. The end cover contains a positioning mechanism, which includes a positioning element embedded in the inner cavity of the end cover and is detachable. The positioning element has a positioning groove for mating with the outer ring of the bearing, so that the radial positioning and wear-bearing interface of the bearing outer ring are borne by the positioning groove, and the end cover body no longer directly serves as the wear-bearing mating surface of the outer ring, thereby reducing the risk of wear and flaring of the end cover seat hole after repeated disassembly and assembly.

[0007] Furthermore, the positioning element is provided with a spline, which engages with the spline groove in the inner cavity of the end cover to restrict the rotation of the positioning element relative to the end cover. Through this anti-rotation relationship, the positioning element is less likely to rotate relative to the outer ring of the bearing in the inner cavity of the end cover, thereby reducing the risk of wear, heat generation and noise caused by the slippage and creep of the outer ring in the seat hole, and making the positioning state of the outer ring more stable.

[0008] Furthermore, a spring is installed inside the end cap cavity. The spring applies an axial restoring force to the positioning component, keeping the bearing axially engaged with the positioning groove. By continuously applying force with the spring, residual looseness after assembly can be eliminated or reduced in the axial direction, suppressing axial movement of the shaft during operation. This reduces the risk of abnormal noises such as friction and knocking sounds, and provides some compensation for wear changes during use, preventing the axial loosening trend of "becoming looser with use".

[0009] Furthermore, the rotating shaft is provided with a retaining ring groove, and a retaining ring is provided in the retaining ring groove. The retaining ring is used to form an axial stop for the bearing, so as to form an axial constraint on the bearing in the opposite direction with the spring, so that the bearing has a clear force direction in the axial direction, reducing the axial movement space and improving the operational stability.

[0010] Furthermore, the positioning component is equipped with a chassis, and a pressure plate is provided in the inner cavity of the end cover. The spring abuts against the chassis through the pressure plate to stably transmit the axial rebound force of the spring to the positioning component, so that the positioning component is subjected to force more evenly and the risk of deformation or jamming caused by local pressure is reduced.

[0011] Furthermore, the springs can be configured as several and distributed circumferentially along the inner cavity of the end cap, and the pressure plate is correspondingly provided with a force-bearing surface so that the positioning component is subjected to balanced force, thereby reducing assembly misalignment, increased friction, or localized wear caused by the off-center loading of the positioning component.

[0012] Furthermore, the locating groove and the bearing outer ring are interference-fitted or tight-fitted to achieve radial positioning of the bearing outer ring and to make the locating groove serve as the wear-resistant locating interface for the bearing outer ring. Through this fit, the outer ring is reliably positioned, and the wear-resistant surface is concentrated on the locating element. After the locating element wears, it can be disassembled and replaced, avoiding damage to the end cover body.

[0013] Furthermore, the end cap is connected and fixed to the outer shell through a connector, so that when the end cap and the outer shell are assembled in place, the spring is compressed and preloaded, thereby allowing the positioning component to maintain a continuous axial compensation force on the bearing, ensuring the long-term stability of the compensation force.

[0014] The beneficial effects of this utility model are as follows: First, the bearing outer ring wear-bearing positioning interface is provided by the positioning component, and the end cover body no longer directly bears the wear-bearing surface of the outer ring. The wear caused by repeated disassembly and assembly is concentrated on the positioning component. When maintaining, the positioning component can be replaced to restore the fit, reducing the risk of end cover scrapping and reducing maintenance costs. Second, the spring in the end cover cavity applies a continuous rebound force to the positioning component, keeping the bearing in axial direction, reducing axial looseness and suppressing axial movement and abnormal noise, resulting in better operational stability. Attached Figure Description

[0015] Figure 1 This is an exploded front view of an embedded bearing positioning mechanism for an electric motor end cover.

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of an embedded bearing positioning mechanism for an electric motor end cover.

[0017] Figure 3 for Figure 2 An exploded view of an embedded bearing positioning mechanism for an electric motor end cover.

[0018] Figure 4 This is a schematic diagram of the positioning component in an embedded bearing positioning mechanism for a motor end cover.

[0019] Attached icon numbers:

[0020] 1. Housing; 2. Fan; 3. Shaft; 31. Snap ring groove; 4. End cover; 41. Connector; 5. Positioning mechanism; 51. Positioning component; 511. Spline; 512. Chassis; 513. Positioning groove; 52. Snap ring; 53. Spring; 531. Pressure plate; 6. Bearing. Detailed Implementation

[0021] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application.

[0022] like Figures 1 to 4As shown, this embodiment provides a motor end cover embedded bearing positioning mechanism. The structure uses the outer shell 1 as the load-bearing and mounting base for the entire machine. The outer shell 1 forms the mounting space inside the motor and has an assembly end face at its end for mounting the end cover 4. The end cover 4 is located at the end opening of the outer shell 1 and is connected and fixed to the outer shell 1 via a connector 41. In this embodiment, the connector 41 is a bolt. The bolt engages with a threaded hole on the outer shell 1, and after tightening the bolt, the end cover 4 is pressed against the end face of the outer shell 1, thereby ensuring that the end cover 4 maintains a stable assembly state under operating vibration and load.

[0023] A fan 2 is installed inside the outer casing 1. The fan 2 is fixedly connected to a rotating shaft 3. The rotating shaft 3 is arranged axially and passes through an end cover 4. A through hole is formed in the middle of the end cover 4 for the rotating shaft 3 to pass through. The rotating shaft 3 is supported by a bearing 6 at the end cover 4. The bearing 6 is sleeved on the rotating shaft 3, and the inner ring of the bearing 6 fits with the rotating shaft 3, so that the bearing 6 rotates synchronously with the rotating shaft 3. The outer ring of the bearing 6 is located on one side of the end cover 4 and is positioned and constrained by a positioning mechanism 5 provided inside the end cover 4, thereby stabilizing the support state of the bearing 6 at the end cover 4 and keeping the position of the rotation support point of the rotating shaft 3 consistent.

[0024] The end cap 4 forms an inner cavity on the side facing the interior of the outer casing 1. This cavity accommodates the positioning mechanism 5 and provides a force-bearing space. A spline groove is provided on the sidewall of the inner cavity of the end cap 4. The spline groove extends axially and forms an angular constraint interface in the circumferential direction for engagement with the spline 511 on the positioning member 51. A pressure-bearing surface is formed at the bottom of the inner cavity of the end cap 4, providing support for the spring 53. The inner cavity of the end cap 4 also forms a space for arranging the pressure plate 531, enabling the pressure plate 531 to establish a contact relationship with the spring 53 and the positioning member 51 within the inner cavity, and ensuring stable transmission of the axial restoring force of the spring 53 within the inner cavity of the end cap 4.

[0025] The positioning mechanism 5 is disposed within the inner cavity of the end cover 4. The positioning mechanism 5 includes a positioning element 51. After being inserted into the inner cavity of the end cover 4, the positioning element 51 resides within the internal space of the end cover 4. When the positioning element 51 is removed from the inner cavity of the end cover 4, it can be disassembled for maintenance, facilitating the restoration of the end cover 4 to its assembled state during maintenance. A spline 511 is formed on the outer periphery of the positioning element 51. The spline 511 engages with a spline groove on the side wall of the inner cavity of the end cover 4. Through the engagement of the spline 511 and the spline groove, the rotation of the positioning element 51 relative to the end cover 4 is restricted, maintaining a stable angular state of the positioning element 51 within the inner cavity of the end cover 4. After the angular state of the positioning element 51 is stabilized, the contact interface of the outer ring of the bearing 6 at the end cover 4 is more stable, and the conditions for relative slippage of the outer ring at the end cover 4 are weakened, thereby reducing contact wear and abnormal operating noise.

[0026] A positioning groove 513 is formed on the positioning element 51. The positioning groove 513 is used to mate with the outer ring of the bearing 6. The inner diameter of the positioning groove 513 matches the outer diameter of the outer ring of the bearing 6. In this embodiment, the positioning groove 513 and the outer ring of the bearing 6 adopt an interference fit or a tight fit. During assembly, the outer ring of the bearing 6 enters the positioning groove 513 and forms a stable fit. After assembly, the radial positioning of the outer ring of the bearing 6 is undertaken by the positioning groove 513. The wear-bearing positioning interface of the outer ring of the bearing 6 is formed by the positioning groove 513. The end cover 4 mainly undertakes the installation and constraint of the positioning element 51 at this location. The end cover 4 does not directly participate in long-term friction as the wear-bearing mating surface of the outer ring of the bearing 6, thereby reducing the wear impact on the assembly part of the end cover 4 and making it easier to maintain a consistent assembly state of the end cover 4.

[0027] A base 512 is formed on the positioning member 51. The base 512 is located at one end of the positioning member 51 along the axial direction and forms a continuous force-bearing surface. The base 512 is used to bear the axial rebound force transmitted by the spring 53 through the pressure plate 531. A force transmission path is formed between the base 512 and the positioning groove 513, so that the axial rebound force of the spring 53 can push the positioning member 51 to apply force along the axial direction, and form an axial contact with the outer ring of the bearing 6 through the positioning groove 513. The force-bearing surface of the base 512 is set as a ring or planar structure, so that the pressure plate 531 and the base 512 form a stable contact when they abut, thereby making the force transmission more uniform and the posture of the positioning member 51 in the inner cavity of the end cover 4 more stable.

[0028] A spring 53 is installed inside the cavity of the end cap 4. In this embodiment, the spring 53 is a compression spring. Several springs 53 are provided. The several springs 53 are distributed circumferentially along the cavity of the end cap 4. One end of each spring 53 abuts against the pressure-bearing surface of the cavity of the end cap 4. The other end of each spring 53 abuts against a pressure plate 531. The pressure plate 531 is disposed between the spring 53 and the positioning member 51. The pressure plate 531 is used to bear the rebound force of the several springs 53 and transmit the rebound force to the base 512 of the positioning member 51. The pressure plate 531 is provided with force-bearing surfaces corresponding to the several springs 53, so that the ends of each spring 53 are in contact with the corresponding force-bearing surfaces, so that the rebound force of the springs 53 is gathered at the pressure plate 531 and then acts on the base 512. The pressure plate 531 is subjected to axial force in the cavity of the end cap 4 and keeps in contact with the base 512, so that the positioning member 51 obtains a more uniform axial pushing force, and the positioning groove 513 is more consistent in axial contact with the outer ring of the bearing 6.

[0029] A retaining ring groove 31 is provided on the rotating shaft 3. A retaining ring 52 is provided in the retaining ring groove 31. The retaining ring 52 engages in the retaining ring groove 31 and forms an axial stop surface. After the bearing 6 is assembled onto the rotating shaft 3, the bearing 6 moves axially and abuts against the retaining ring 52, thus restricting the axial movement of the bearing 6 in that direction. After the end cover 4 is assembled in place, the spring 53 is compressed to form a preload. The spring 53 applies force to the chassis 512 through the pressure plate 531. Under axial force, the positioning member 51 applies axial contact to the outer ring of the bearing 6 through the positioning groove 513. The retaining ring 52 forms a one-sided stop. The spring 53 forms opposing pushing. The bearing 6 remains in a contact state in the axial direction, thereby suppressing axial movement of the rotating shaft 3 during operation and reducing knocking and friction noise caused by axial movement.

[0030] When the end cap 4 is assembled with the outer shell 1, the connecting piece 41 presses the end cap 4 onto the end face of the outer shell 1. During the pressing process of the end cap 4, the pressure surface of the inner cavity of the end cap 4 generates an axial compression stroke on the spring 53, causing the spring 53 to be in a pre-tightened state. After being pre-tightened, the spring 53 continuously outputs a rebound force. The rebound force acts on the chassis 512 through the pressure plate 531. Under the action of the rebound force, the positioning piece 51 continuously applies force towards the bearing 6, so that the positioning groove 513 keeps in contact with the outer ring of the bearing 6 in the axial direction. This contact action is continuous during operation, making it difficult for the bearing 6 to loosen axially at the end cap 4. When the contact surface between the outer ring of the bearing 6 and the positioning groove 513 wears out during long-term operation, the spring 53 can still maintain the axial contact pressure of the positioning piece 51 through the rebound stroke, keeping the contact state stable, thereby reducing abnormal operating noise caused by increased axial clearance.

[0031] The assembly process of this embodiment is described as follows: Before assembly, the rotating shaft 3 is cleaned to ensure that there are no residual impurities in the snap ring groove 31 and that the snap ring 52 can be properly engaged. During assembly, the snap ring 52 is first inserted into the snap ring groove 31, so that the snap ring 52 is firmly engaged in the snap ring groove 31 and forms a stable stop surface. Then, the bearing 6 is assembled onto the rotating shaft 3, so that the inner ring of the bearing 6 fits with the rotating shaft 3, and the bearing 6 is pushed axially until the bearing 6 abuts against the snap ring 52, so that the axial position of the bearing 6 in this direction is defined by the snap ring 52. Then, the positioning member 51 is fitted and assembled with the outer ring of the bearing 6, so that the outer ring of the bearing 6 enters the positioning groove 513 and is pressed in, so that the positioning groove 513 and the outer ring of the bearing 6 form an interference fit or a tight fit, so that the radial positioning of the outer ring is established at the positioning groove 513. The positioning element 51 is then installed into the inner cavity of the end cover 4, aligning the spline 511 with the spline groove on the side wall of the inner cavity of the end cover 4 and engaging it, thus providing angular constraint for the positioning element 51 within the inner cavity of the end cover 4. Next, the pressure plate 531 is installed into the inner cavity of the end cover 4, abutting against the chassis 512. Then, several springs 53 are placed one by one between the pressure-bearing surface of the inner cavity of the end cover 4 and the pressure plate 531, ensuring that the ends of each spring 53 are in contact with the corresponding force-bearing surfaces of the pressure plate 531. Finally, the end cover 4 is assembled with the outer shell 1 and pushed into place, compressing the springs 53 to form a preload. The end cover 4 is then fixed to the outer shell 1 via the connecting element 41. After assembly, the positioning element 51 is restricted from rotation by the engagement of the spline 511 with the spline groove, the positioning groove 513 provides radial positioning for the outer ring of the bearing 6, and the springs 53 continuously apply force to the chassis 512 via the pressure plate 531, keeping the bearing 6 in contact in the axial direction.

[0032] The disassembly and maintenance process of this embodiment is described as follows: First, disconnect the connector 41 to release the connection between the end cover 4 and the outer shell 1. After the end cover 4 is removed from the end of the outer shell 1, the compression of the spring 53 is released, and the axial pushing force on the positioning member 51 is released. Then, remove the spring 53. After removing the spring 53, remove the pressure plate 531. After removing the pressure plate 531, the positioning member 51 can be withdrawn axially from the inner cavity of the end cover 4, causing the spline 511 to disengage from the spline groove, and the positioning member 51 is removed from the inner cavity of the end cover 4. After the positioning member 51 is removed, the mating interface between the positioning groove 513 and the outer ring of the bearing 6 is in a detachable state, allowing the bearing 6 to be disassembled or the positioning member 51 to be replaced as needed for maintenance. After maintenance, reset according to the assembly process, allowing the spline 511 to re-engage with the spline groove, causing the spring 53 to re-form its preload and act on the chassis 512 through the pressure plate 531, thereby restoring the positioning and contact state of the outer ring of the bearing 6 at the end cover 4.

[0033] The force and constraint relationship during operation in this embodiment is described as follows. When the shaft 3 rotates, the bearing 6 bears a radial load. The radial load is transmitted from the shaft 3 to the inner ring of the bearing 6, and then to the outer ring of the bearing 6. The outer ring of the bearing 6 transmits the radial load to the positioning member 51 through the positioning groove 513. The positioning member 51 transmits the load to the support structure of the inner cavity of the end cover 4. The end cover 4 transmits the load to the outer shell 1 through the connecting member 41. The positioning member 51 is restricted in rotation by engaging with the spline groove of the end cover 4 through the spline 511, so that the angular state of the positioning member 51 is consistent with that of the end cover 4, thereby reducing the wear and heat caused by the relative slippage of the outer ring at the end cover 4. In the axial direction, the retaining ring 52 forms a stop for the bearing 6. The spring 53 pushes the positioning member 51 through the pressure plate 531. The positioning member 51 forms an axial contact with the outer ring of the bearing 6 through the positioning groove 513. Bearing 6 remains in contact in the axial direction, thereby suppressing axial movement and reducing abnormal operating noise caused by axial movement.

[0034] The adaptation method for maintenance and disassembly conditions in this embodiment is described as follows. When the motor is disassembled for maintenance or the shaft 3 is surface-treated, the end cover 4 needs to be removed from the end of the housing 1. After the end cover 4 is removed, the positioning element 51 can be withdrawn from the inner cavity of the end cover 4, allowing the mating interface between the outer ring of the bearing 6 and the positioning groove 513 to be re-established. During reassembly, the positioning groove 513 and the outer ring again form an interference fit or tight fit, restoring the radial positioning of the outer ring of the bearing 6 to the positioning groove 513. The spline 511 engages with the spline groove again, restricting the rotation of the positioning element 51. The spring 53 is pre-tensioned again and continuously applies force to the chassis 512 via the pressure plate 531, restoring the axial contact state of the bearing 6. Through the above assembly and disassembly path, the end cover 4 can maintain a clear assembly relationship of the internal positioning structure during repeated disassembly and assembly. The positioning interface of the outer ring of the bearing 6 is concentrated at the positioning groove 513 for establishment and restoration, making it easier to maintain consistent assembly stability at the end cover 4, and making it easier to control operating noise and axial movement within a stable state.

[0035] Through the above structure and operation process, this embodiment sets a positioning mechanism 5 in the inner cavity of the end cover 4, so that the bearing 6 outer ring wear-bearing positioning interface is borne by the positioning groove 513, and the rotation of the positioning member 51 is restricted by the meshing of the spline 511 and the spline groove. At the same time, the pre-tightening rebound force of the spring 53 is applied to the chassis 512 through the pressure plate 531, so that the bearing 6 is kept in contact in the axial direction, and forms a mutual constraint with the snap ring 52, thereby realizing the stable positioning and operation constraint of the bearing 6 at the end cover 4.

[0036] For those skilled in the art, any modifications, equivalent substitutions, or improvements made without departing from the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A motor end cover embedded bearing positioning mechanism, comprising a shell (1), a fan (2) is arranged in the shell (1), the fan (2) is fixedly connected to a rotating shaft (3), a bearing (6) is sleeved on the rotating shaft (3), and the rotating shaft (3) penetrates through an end cover (4); characterized in that: The end cap (4) is provided with a positioning mechanism (5), which includes a positioning element (51). The positioning element (51) is embedded in the inner cavity of the end cap (4) and is detachable. The positioning element (51) is provided with a positioning groove (513) for cooperating with the outer ring of the bearing (6). The positioning element (51) is provided with a spline (511), which meshes with the spline groove of the inner cavity of the end cap (4) to restrict the rotation of the positioning element (51) relative to the end cap (4). The inner cavity of the end cap (4) is provided with a spring (53), which is used to apply an axial rebound force to the positioning element (51) so that the bearing (6) is kept in contact with the positioning groove (513) in the axial direction, thereby suppressing axial movement. ​ 2. The electric machine end-shield embedded bearing positioning mechanism of claim 1, wherein: The rotating shaft (3) is provided with a retaining ring groove (31), and a retaining ring (52) is provided in the retaining ring groove (31). The retaining ring (52) is used to form an axial stop on the bearing (6) so as to form an axial constraint on the bearing (6) in the opposite direction with the spring (53).

3. The electric machine end-shield embedded bearing positioning mechanism of claim 2, wherein: The positioning component (51) is provided with a chassis (512), and the end cap (4) has a pressure plate (531) inside its cavity. The spring (53) abuts against the chassis (512) through the pressure plate (531) to transmit the axial rebound force of the spring (53) to the positioning component (51).

4. The electric machine end-shield embedded bearing positioning mechanism of claim 3, wherein: The springs (53) are a plurality of them and are distributed circumferentially along the inner cavity of the end cap (4). The pressure plate (531) is provided with a force-bearing surface corresponding to the plurality of springs (53) so that the positioning member (51) is subjected to balanced force.

5. The electric machine end-shield embedded bearing positioning mechanism of claim 1, wherein: The positioning groove (513) is interference fit or tight fit with the outer ring of the bearing (6) to achieve radial positioning of the outer ring of the bearing (6) and to make the positioning groove (513) serve as the wear-bearing positioning interface of the outer ring of the bearing (6).

6. The electric machine end-shield embedded bearing positioning mechanism of claim 4, wherein: The end cap (4) is connected and fixed to the outer shell (1) through the connector (41), so that when the end cap (4) and the outer shell (1) are assembled in place, the spring (53) is compressed and pre-tightened, so that the positioning member (51) maintains a continuous axial compensation force on the bearing (6).

Images