Pelvis width adjusting mechanism

Abstract

The utility model provides a pelvis width adjusting mechanism which is applied to a rehabilitation robot, the pelvis width adjusting mechanism comprises a motor and a manual connecting part, the motor is connected with a transmission rod of the pelvis width adjusting mechanism and used for driving the transmission rod to rotate around the axis of the transmission rod, and the manual connecting part is arranged at the end of the transmission rod and used for being connected with a manual adjusting tool. And the transmission rod is screwed. By arranging the motor on the pelvis width adjusting mechanism, the pelvis width adjusting mechanism can be driven by electric power, manual width adjustment is not needed, adjustment is easier and more convenient, meanwhile, the manual connecting part is arranged at the end of the transmission rod, and when the motor breaks down, a manual adjusting tool can be connected through the manual connecting part; and the transmission rod is screwed to adjust the pelvis width adjusting mechanism, so that the reliability of the device is improved.

Description

Technical Field

[0001] The utility model relates to a rehabilitation robot, in particular to a pelvis width adjusting mechanism. Background Art

[0002] With the advancement of medical technology, more and more auxiliary equipment can help patients with lower limb weakness or disorders to recover, such as various rehabilitation robots. Pelvic training can improve the balance ability of both sides of the body and accelerate the recovery of patients' motor ability. Replacing traditional physiotherapists with rehabilitation robots can effectively reduce the workload of physiotherapists and improve the rehabilitation efficiency of patients. However, the width adjustment mechanism of the pelvic motion unit of the rehabilitation robot in the prior art is adjusted by manually twisting the transmission rod on the width adjustment mechanism, which is not convenient to use and requires a lot of effort to adjust. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a pelvis width adjustment mechanism in order to overcome the defect that the pelvis width adjustment mechanism of the rehabilitation robot in the prior art is inconvenient to use by manual adjustment.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A pelvic width adjustment mechanism, which is applied to a rehabilitation robot, comprises:

[0006] A motor, the motor being connected to a transmission rod of the pelvic width adjustment mechanism and being used for driving the transmission rod to rotate around an axis of the transmission rod;

[0007] A manual connection portion is arranged at the end of the transmission rod and is used for being connected by a manual adjustment tool to screw the transmission rod.

[0008] By arranging a motor on the pelvic width adjustment mechanism, the pelvic width adjustment mechanism can be driven by electricity, without manual width adjustment, and the adjustment is easier and more convenient. At the same time, a manual connecting part is arranged at the end of the transmission rod. When the motor fails, a manual adjustment tool can be connected through the manual connecting part, and the transmission rod can be screwed to adjust the pelvic width adjustment mechanism, thereby improving the reliability of the device. Compared with the method of directly arranging a handle or other manual adjustment mechanism on the transmission rod to improve the reliability of the device, the manual connecting part is arranged at the end of the transmission rod, and a manual adjustment tool is connected externally for manual adjustment when necessary, so that the overall structure is simpler, the load when the motor is running is smaller, and it is not easy to be damaged.

[0009] Preferably, the manual connection portion is a polygonal structure formed on the peripheral side surface of the end of the transmission rod. By arranging the polygonal structure on the peripheral side surface of the end of the transmission rod, a socket wrench can be connected through the polygonal structure to screw the transmission rod when manual adjustment is required.

[0010] Preferably, the terminal plane of the end of the transmission rod has a connecting hole, and the manual connecting portion is a polygonal structure formed on the peripheral side surface of the connecting hole.

[0011] By arranging a connection hole on the terminal plane of the end of the transmission rod and arranging the inner surface of the connection hole to be a polygonal structure, a polygonal wrench can be used to screw the transmission rod when manual adjustment is required.

[0012] Preferably, the transmission rod has external threads with opposite rotation directions, and the external threads are symmetrically arranged on the transmission rod; the pelvic width adjustment mechanism also includes a sliding portion, and the sliding portion includes two transmission nuts, and the two transmission nuts have internal threads with opposite rotation directions, and the internal threads of the two transmission nuts are respectively engaged with the external threads on the transmission rod, and the transmission nuts are symmetrically sleeved on the transmission rod.

[0013] The motor drives the transmission rod to rotate around its axis. Since the transmission nut is engaged with the external thread structure on the transmission rod and the transmission nut is symmetrically sleeved on the transmission rod, when the motor drives the transmission rod to rotate, the transmission nuts matched with the external threads on the transmission rod with opposite rotation directions move to both ends or to the middle at the same time. The transmission nut always maintains a symmetrical state during the movement. The pelvic width adjustment mechanism realizes the width adjustment function while always maintaining its own balance.

[0014] Preferably, the transmission rod is a trapezoidal screw at the external thread.

[0015] By setting the part with external thread of the transmission rod as a trapezoidal screw, the pelvic width adjustment mechanism has a stepless adjustment function, and the transmission nut has a self-locking function when moving on the transmission rod, preventing the transmission nut from moving axially when the sliding part is subjected to external force and changing the width between the two transmission nuts.

[0016] Preferably, the sliding part further includes two sliding assemblies, the two sliding assemblies are respectively connected to the transmission nuts, and the pelvic width adjustment mechanism further includes a guide rail, and the sliding assembly can slide on the guide rail under the action of the transmission nut.

[0017] The guide rails are provided to make the sliding assembly smoother during the sliding process. At the same time, the guide rails have better supporting capacity. During the sliding process of the sliding assembly, the guide rails have better bending resistance and are not easily deformed by force.

[0018] Preferably, the motor is arranged corresponding to the middle position of the transmission rod of the pelvic width adjustment mechanism, and in the axial extension direction of the transmission rod, the motor and the transmission rod are staggered; the pelvic width adjustment mechanism also includes a transmission assembly, which respectively connects the middle position of the transmission rod and the motor.

[0019] By arranging the motor to be connected to the middle position of the transmission rod, the center of gravity of the pelvic width adjustment mechanism is kept in the middle position in the direction of its width adjustment, thereby ensuring the balance of the pelvic width adjustment mechanism itself.

[0020] Preferably, the transmission assembly includes a driving gear and a driven gear, the driving gear is fixed on the motor, the driven gear is sleeved on the middle position of the transmission rod, and the driving gear and the driven gear are meshed.

[0021] By arranging gears for transmission between the motor and the transmission rod, the motor and the transmission rod can run smoothly, and the volume of the gears is small, making the overall structure more compact.

[0022] Preferably, the driving gear and the driven gear are capable of converting a first rotational speed of the guide shaft into a second rotational speed of the transmission rod.

[0023] Preferably, the transmission rod comprises a gear mounting section, the gear mounting section is arranged at a middle position of the transmission rod, and the diameter of the gear mounting section is greater than the diameter of other parts of the transmission rod.

[0024] By setting the gear installation section to have a diameter larger than other parts, it is more convenient to install the driven gear from the end of the transmission rod to the middle, thereby preventing the driven gear from being stuck and unable to be installed on the gear installation section.

[0025] Preferably, the pelvic width adjustment mechanism also includes a mounting base plate, a guide shaft mounting plate is arranged on the mounting base plate, the guide shaft mounting plate is perpendicular to the mounting base plate, a guide shaft mounting hole is arranged on the guide shaft mounting plate, and the guide shaft of the motor is inserted into the guide shaft mounting hole.

[0026] Preferably, a bearing is provided in the guide shaft mounting hole, and the guide shaft passes through the bearing hole of the bearing.

[0027] By arranging a bearing in the guide shaft mounting hole, the guide shaft of the motor can rotate more smoothly.

[0028] Preferably, a support is provided on the mounting base plate, a bearing is provided on the support, and the transmission rod is passed through a bearing hole of the bearing.

[0029] The transmission rod is fixed to the mounting base plate by using a bearing to ensure that the transmission rod can rotate smoothly and reduce the rotation resistance.

[0030] The positive and progressive effects of the utility model are:

[0031] By arranging a motor on the pelvic width adjustment mechanism, the pelvic width adjustment mechanism can be driven by electricity, without manual width adjustment, and the adjustment is easier and more convenient. At the same time, a manual connecting part is arranged at the end of the transmission rod. When the motor fails, a manual adjustment tool can be connected through the manual connecting part, and the transmission rod can be screwed to adjust the pelvic width adjustment mechanism, thereby improving the reliability of the device. Compared with the method of directly arranging a handle or other manual adjustment mechanism on the transmission rod to improve the reliability of the device, the manual connecting part is arranged at the end of the transmission rod, and a manual adjustment tool is connected externally for manual adjustment when necessary, so that the overall structure is simpler, the load when the motor is running is smaller, and it is not easy to be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The figure is a top view of the structure of a pelvic width adjustment mechanism according to a preferred embodiment of the utility model.

[0033] Figure 2 This is a structural schematic diagram of a pelvic width adjustment mechanism according to a preferred embodiment of the utility model (I).

[0034] Figure 3 This is a structural schematic diagram (II) of a pelvic width adjustment mechanism according to a preferred embodiment of the present invention.

[0035] Figure 4 The figure is a schematic structural diagram of a transmission rod according to a preferred embodiment of the utility model.

[0036] Description of reference numerals:

[0037] Pelvic width adjustment mechanism 1

[0038] Transmission component 2

[0039] Drive gear 201

[0040] Driven gear 202

[0041] Transmission rod 3

[0042] Gear installation section 301

[0043] External thread 302

[0044] Boss 303

[0045] Sliding part 4

[0046] Drive nut 401

[0047] Nut connecting plate 402

[0048] Slider 403

[0049] Slider connecting plate 404

[0050] Motor 5

[0051] Guide shaft 501

[0052] Install the base plate 6

[0053] Guide shaft mounting plate 601

[0054] Motor mounting plate 602

[0055] Support 603

[0056] Bearing seat 604

[0057] Buffer block 605

[0058] Stopper 606

[0059] Guide Rail 7

[0060] Deep groove ball bearing 8 DETAILED DESCRIPTION

[0061] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0062] like Figure 1-Figure 4 As shown, this embodiment provides a pelvic width adjustment mechanism 1, which is applied to a rehabilitation robot. The pelvic width adjustment mechanism 1 includes a motor 5 and a transmission assembly 2. The motor 5 is arranged corresponding to the middle position of the transmission rod 3 of the pelvic width adjustment mechanism 1, and in the axial extension direction of the transmission rod 3, the motor 5 and the transmission rod 3 are staggered. The transmission assembly 2 is respectively connected to the motor 5 and the middle position of the transmission rod 3. The motor 5 drives the transmission rod 3 to rotate around the axis of the transmission rod 3 through the transmission assembly 2. By arranging the motor 5 on the pelvic width adjustment mechanism 1, the pelvic width adjustment mechanism 1 can be driven by electricity, without manual width adjustment, and the adjustment is easier and more convenient. The motor 5 is arranged to be connected to the middle position of the transmission rod 3, and the center of gravity of the pelvic width adjustment mechanism 1 is maintained in the middle position in the direction of its width adjustment, ensuring the balance of the pelvic width adjustment mechanism 1.

[0063] In this embodiment, the motor is arranged at the middle position of the transmission rod 3 of the pelvic width adjustment mechanism 1, and the motor 5 and the transmission rod 3 are staggered in the axial extension direction of the transmission rod 3. Therefore, the transmission assembly 2 is required to transmit the power of the motor 5 to the transmission rod 3. In other embodiments, the motor 5 can be only arranged at one end of the transmission rod 3 and directly act on the transmission rod 3. In this case, there is no need to set the transmission assembly 2.

[0064] Specifically, the transmission rod 3 has an external thread 302 with opposite rotation directions, and the two external threads 302 with opposite rotation directions are symmetrically arranged on the transmission rod 3. The pelvic width adjustment mechanism 1 also includes a sliding part 4, and the sliding part 4 includes two transmission nuts 401 with opposite rotation directions of internal threads. The internal threads of the two transmission nuts 401 are respectively meshed with the external threads 302 on the transmission rod 3, and the transmission nuts 401 are symmetrically sleeved on the transmission rod 3. The motor 5 drives the transmission rod 3 to rotate around its axis. Since the transmission nuts 401 are structurally meshed with the external threads 302 on the transmission rod 3, and the transmission nuts 401 are symmetrically sleeved on the transmission rod 3, when the motor 5 drives the transmission rod 3 to rotate, the transmission nuts 401 meshed with the external threads 302 on the transmission rod 3 with opposite rotation directions move to both ends or to the middle at the same time, and the transmission nuts 401 always maintain a symmetrical state during the movement. While the pelvic width adjustment mechanism 1 realizes the width adjustment function, it always maintains its own balance.

[0065] That is to say, the transmission nuts 401 are initially arranged symmetrically on the transmission rod 3. During the rotation of the transmission rod 3, the two transmission nuts 401 move closer to or farther away from each other, and the two nuts always maintain a symmetrical state.

[0066] In this embodiment, the external thread 302 on the transmission rod 3 is a trapezoidal screw. The trapezoidal screw enables the pelvic width adjustment mechanism to have a stepless adjustment function, and compared with the use of a ball screw, the portion of the transmission rod 3 with the external thread 302 is set as a trapezoidal screw, so that the transmission nut 401 has a self-locking function when moving on the transmission rod 3, preventing the transmission of force to the motor 5 through the transmission rod 3 and the transmission assembly 2 when the sliding part 4 is subjected to external force, causing damage to the motor 5, and preventing the transmission nut 401 from moving axially when the sliding part 4 is subjected to external force to change the width between the two transmission nuts 401.

[0067] Specifically, in this embodiment, if Figure 4 As shown, the external thread 302 on the transmission rod 3 only needs to be set in a width area within the travel range of the transmission nut 401 on the transmission rod 3 when the pelvic width adjustment mechanism 1 is adjusted. Figure 4 The external thread 302 in the figure has been simplified), and other areas on the transmission rod 3 can be set as a polished rod.

[0068] In this embodiment, the transmission assembly 2 includes a driving gear 201 and a driven gear 202. The driving gear 201 is sleeved on the guide shaft 501 of the motor 5, and the driven gear 202 is sleeved on the middle position of the transmission rod 3. The driving gear 201 and the driven gear 202 are meshed. The power of the motor 5 is transmitted to the transmission rod 3 through the transmission assembly 2, so that the pelvic width adjustment mechanism runs smoothly. The volume of the gear is small, and the transmission assembly is set as the driving gear 201 and the driven gear 202, so that the overall structure is more compact.

[0069] Specifically, in this embodiment, the driving gear 201 and the driven gear 202 can convert the first rotational speed of the motor 5 into the second rotational speed of the transmission rod 3 during the transmission process, and the second rotational speed is lower than the first rotational speed. By utilizing the driving gear 201 and the driven gear 202, the first rotational speed of the motor 5 is converted into the second rotational speed of the transmission rod 3, and the second rotational speed is lower than the first rotational speed, thereby reducing the rotational speed of the transmission rod 3 and preventing the transmission rod 3 from rotating too fast, resulting in too low an adjustment accuracy.

[0070] Of course, in other embodiments, by adjusting the diameter and number of teeth of the driving gear 201 and the driven gear 202, the rotational speed relationship converted by the driving gear 201 and the driven gear 202 can also be adjusted according to actual needs, which will not be repeated here.

[0071] The motor has a guide shaft 501. During the operation of the pelvic width adjustment mechanism 1, the driving gear 201 will generate a bending moment on the motor 5. The guide shaft 501 can offset the effect of this bending moment and prevent the motor 5 from being damaged. In this embodiment, the pelvic width adjustment mechanism 1 also includes a mounting base plate 6, on which a guide shaft mounting plate 601 and a motor mounting plate 602 are arranged. The guide shaft mounting plate 601 and the motor mounting plate 602 are arranged perpendicular to the mounting base plate 6. A guide shaft mounting hole is arranged on the guide shaft mounting plate 601. The guide shaft 501 of the motor 5 is inserted into the guide shaft mounting hole. The motor 5 is installed on the mounting base plate 6 through the motor mounting plate 602. A bearing is arranged in the guide shaft mounting hole, and the guide shaft 501 is inserted into the bearing hole of the bearing. By arranging a bearing at the guide shaft mounting hole, the guide shaft 501 of the motor 5 rotates more smoothly.

[0072] A gear installation section 301 is provided at the middle position of the transmission rod 3, and the diameter of the gear installation section 301 is larger than the diameter of other parts of the transmission rod 3. By setting the diameter of the gear installation section 301 to be larger than the diameter of other parts of the transmission rod 3, it is more convenient to install the driven gear 202 from the end of the transmission rod 3 to the middle, and it is prevented that the driven gear 202 is stuck when installing and cannot be installed on the gear installation section 301 located in the middle position of the transmission rod 3.

[0073] In addition, a support 603 and a bearing seat 604 are also provided on the mounting base plate 6. The support 603 is symmetrically arranged corresponding to the position close to the two ends of the transmission rod 3. A bearing is arranged on the support 603. The transmission rod 3 is inserted into the bearing on the support 603. Deep groove ball bearings 8 are arranged at the support 603 and the guide shaft mounting hole. The bearing seat 604 is arranged corresponding to the middle position of the transmission rod 3. A tapered roller bearing is arranged at the bearing seat 604, and pressure plates are arranged on both sides of the tapered roller bearing. The tapered roller bearing ensures that the transmission rod 3 can rotate smoothly while preventing the transmission rod 3 from moving on both sides, thereby ensuring the smooth operation of the pelvic width adjustment mechanism 1.

[0074] In this embodiment, the sliding part 4 includes two sliding assemblies, which are respectively connected to two transmission nuts 401, and the pelvic width adjustment mechanism 1 also includes a guide rail 7, and the sliding assembly can slide on the guide rail 7 under the action of the transmission nut 401. Specifically, the sliding part includes two transmission nuts 401 and two sliding assemblies, each of which includes a nut connecting plate 402, a slider 403 and a slider connecting plate 404, and the slider 403 can slide on the guide rail 7. The nut connecting plate 402 is connected to the transmission nut 401, and one end of the slider connecting plate 404 is connected to the slider 403, and the other end is connected to the nut connecting plate 402. Under the joint action of the guide rail 7 and the transmission nut 401, the sliding assembly slides in a direction parallel to the axial extension direction of the transmission rod 3 to achieve the width adjustment function of the pelvic width adjustment mechanism 1. The guide rail 7 is provided to make the sliding assembly smoother during the sliding process, and the guide rail 7 has a bending resistance in multiple dimensions, and is not easy to be deformed by force during the sliding process of the sliding assembly.

[0075] Of course, in other embodiments, the guide rail 7 may not be provided, and a smooth rod may be used to connect the slider 403 instead. When the driving nut 401 moves, the slider 403 slides along the smooth rod.

[0076] Furthermore, in this embodiment, the inner side of the support 603 near the middle position of the transmission rod 3 is the end point of the travel of the nut connecting plate 402, and a buffer block 605 is provided therein to prevent the nut connecting plate 402 from hitting the support 603, and a retaining spring is provided on the outer side of the support 603. A stopper 606 is provided at the end of the guide rail 7 to prevent the slider 403 from sliding off the guide rail 7.

[0077] In this embodiment, the end of the transmission rod 3 also has a manual connecting part, which can be connected to a manual adjustment tool to screw the transmission rod 3. By providing the manual connecting part at the end of the transmission rod 3, when the motor 5 fails, the manual adjustment tool can be connected through the manual connecting part, and the transmission rod 3 can be screwed to adjust the pelvic width adjustment mechanism 1, thereby improving the reliability of the device. Compared with the method of directly providing a handle or other manual adjustment mechanism on the transmission rod 3, the reliability of the device is improved. The manual connecting part is provided at the end of the transmission rod 3, and a manual adjustment tool is connected externally for manual adjustment when necessary, so that the overall structure is simpler. By providing a manual connecting part that is easy to disassemble and assemble the manual adjustment tool, the manual connecting part does not need to be connected to the manual adjustment tool when the motor 5 is running. The load on the motor 5 is smaller and not easy to be damaged. When manual adjustment is performed, the motor is in a free state of power failure, which will not interfere with the manual adjustment.

[0078] Specifically, in this embodiment, the manual connection portion is a polygonal structure formed on the circumferential side surface of the end of the transmission rod 3, that is, two bosses 303. The bosses 303 are formed at the ends of the transmission rod 3 and protrude relative to the mounting base plate 6 in the axial extension direction of the transmission rod 3. Furthermore, the outer peripheral side of the boss 303 is hexagonal. When manual adjustment is required, a hexagonal socket wrench can be connected through the boss 303 to screw the transmission rod 3.

[0079] Of course, in other embodiments, the manual connection portion may also be in other forms, for example, a connection hole is provided on the terminal plane of the end of the transmission rod 3, the connection hole extends along the axial direction of the transmission rod 3, and the peripheral surface of the connection hole is a polygonal structure for connecting a wrench or a handle, etc., which will not be elaborated here.

[0080] In this embodiment, the diameter of the external thread 302 of the transmission rod 3 is larger than the diameter of the transmission rod 3 near the end, which facilitates the transmission nut 401 to be sleeved onto the external thread 302 of the transmission rod 3 from the end of the transmission rod 3 to the middle position.

[0081] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A pelvic width adjustment mechanism, which is applied to a rehabilitation robot, characterized in that: The pelvic width adjustment mechanism comprises: A motor, the motor being connected to a transmission rod of the pelvic width adjustment mechanism and being used for driving the transmission rod to rotate around an axis of the transmission rod; A manual connection portion is arranged at the end of the transmission rod and is used for being connected by a manual adjustment tool to screw the transmission rod.

2. The pelvic width adjustment mechanism according to claim 1, characterized in that: The manual connection portion is a polygonal structure formed on the peripheral side surface of the end of the transmission rod; And / or, the terminal plane of the end of the transmission rod has a connecting hole, and the manual connecting portion is a polygonal structure formed on the peripheral side surface of the connecting hole.

3. The pelvic width adjustment mechanism according to claim 1, characterized in that: The transmission rod has external threads with opposite rotation directions, and the external threads are symmetrically arranged on the transmission rod; The pelvic width adjustment mechanism also includes a sliding part, which includes two transmission nuts. The two transmission nuts have internal threads with opposite rotation directions. The internal threads of the two transmission nuts are respectively engaged with the external threads on the transmission rod. The transmission nuts are symmetrically sleeved on the transmission rod.

4. The pelvic width adjustment mechanism according to claim 3, characterized in that: The transmission rod is a trapezoidal screw rod at the external thread; And / or, the sliding part further includes two sliding assemblies, the two sliding assemblies are respectively connected to the transmission nuts, and the pelvic width adjustment mechanism further includes a guide rail, and the sliding assembly can slide on the guide rail under the action of the transmission nut.

5. The pelvic width adjustment mechanism according to any one of claims 1 to 4, characterized in that: The motor is arranged corresponding to the middle position of the transmission rod of the pelvic width adjustment mechanism, and in the axial extension direction of the transmission rod, the motor and the transmission rod are staggered; the pelvic width adjustment mechanism also includes a transmission assembly, which respectively connects the middle position of the transmission rod and the motor.

6. The pelvic width adjustment mechanism according to claim 5, characterized in that: The transmission assembly comprises a driving gear and a driven gear, wherein the driving gear is fixed on the motor, and the driven gear is sleeved at the middle position of the transmission rod, and the driving gear and the driven gear are meshed.

7. The pelvic width adjustment mechanism according to claim 6, characterized in that: The driving gear and the driven gear are capable of converting a first rotation speed of the motor into a second rotation speed of the transmission rod.

8. The pelvic width adjustment mechanism according to claim 6, characterized in that: The transmission rod comprises a gear mounting section, which is arranged at a middle position of the transmission rod, and a diameter of the gear mounting section is greater than a diameter of other parts of the transmission rod.

9. The pelvic width adjustment mechanism according to claim 6, characterized in that: The pelvic width adjustment mechanism also includes a mounting base plate, a guide shaft mounting plate is arranged on the mounting base plate, the guide shaft mounting plate is perpendicular to the mounting base plate, a guide shaft mounting hole is arranged on the guide shaft mounting plate, and the guide shaft of the motor is inserted into the guide shaft mounting hole.

10. The pelvic width adjustment mechanism according to claim 9, characterized in that: A bearing is arranged in the guide shaft installation hole, and the guide shaft is passed through the bearing hole of the bearing; And / or, a support is arranged on the mounting base plate, a bearing is arranged on the support, and the transmission rod is passed through a bearing hole of the bearing.

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