Flap valve

Abstract

The embodiment of the utility model discloses a flap valve, relates to the technical field of valve equipment, and can effectively improve the opening and closing speed of the valve and avoid blocking. The flap valve comprises a shell, a flap and a driving device. The shell is of a cylindrical structure with two open ends; the turning plate is arranged at the first opening end of the shell and comprises a rotating shaft and a valve plate, the rotating shaft is connected with the valve plate in the axial direction, the rotating shaft is rotationally connected with the shell so that the rotating shaft can rotate around the axis of the rotating shaft, and the valve plate is matched with the first opening end in shape. The turning plate is configured to enable the valve plate to be communicated with the first opening end under the first rotating angle of the rotating shaft and block the first opening end under the second rotating angle of the rotating shaft; and the driving device is configured to drive the rotating shaft to rotate, so that the rotating shaft at least can rotate to the first rotating angle and the second rotating angle. The method is suitable for material filling scenes.

Description

Technical Field

[0001] This application relates to the technical field of valve equipment, and particularly to a flap valve. Background Art

[0002] When filling materials, a valve needs to be configured to control the flow of materials. The current valve structures often have a slow opening and closing speed, and it is easy for particles to fall in during the opening and closing process of the valve, resulting in valve jamming and affecting the normal progress of coal mine filling work. Summary of the Utility Model

[0003] In view of this, this application provides a flap valve to achieve rapid opening and closing of the valve and avoid jamming.

[0004] An embodiment of this application provides a flap valve, including: a housing, the housing is a cylindrical structure with openings at both ends; a flap, the flap is arranged at the first opening end of the housing, the flap includes a rotating shaft and a valve plate, the rotating shaft is axially connected to the valve plate, and the rotating shaft is rotatably connected to the housing to be able to rotate around the axis of the rotating shaft, the valve plate is adapted to the shape of the first opening end, the flap is configured such that at a first rotation angle of the rotating shaft, the valve plate conducts the first opening end, and at a second rotation angle of the rotating shaft, the valve plate blocks the first opening end; a driving device, the driving device is configured to drive the rotating shaft to rotate so that the rotating shaft can at least rotate to the first rotation angle and the second rotation angle.

[0005] In a specific implementation, the driving device includes a rocker arm and a linear motion mechanism, the linear motion mechanism is configured with a push rod that can reciprocate linearly, and the linear motion mechanism is rotatably connected to the housing; the first end of the rocker arm is connected to the rotating shaft, and the second end of the rocker arm is rotatably connected to the end of the push rod.

[0006] In a specific implementation, a planar structure is axially provided on the outer wall of the rotating shaft, a backing plate is connected to the planar structure, and the valve plate is detachably connected to the backing plate.

[0007] In a specific implementation, the housing is provided with a flange at the first opening end; and / or a guiding plate is circumferentially provided in the cavity of the housing at the first opening end, and at the second rotation angle of the rotating shaft, the guiding plate encloses the valve plate and forms a buffer groove with the valve plate.

[0008] In a specific implementation, bearing seats are respectively provided on both sides of the first opening end of the housing, and the rotating shaft passes through the bearing seats.

[0009] In a specific embodiment, the bearing housing includes a mounting plate, a housing body, and an end cover that are sequentially adjacent to each other. The mounting plate, the housing body, and the end cover are respectively provided with through holes along the direction in which the rotating shaft passes through. A bearing is embedded in the through hole of the housing body, and the mounting plate is connected to the housing.

[0010] In a specific embodiment, a housing body seal is provided between the through hole of the housing body and the bearing; and / or an end cover seal is provided in the through hole of the end cover; and / or a first end face seal is provided on the contact surface where the housing body and the mounting plate are adjacent to each other; and / or a second end face seal is provided on the contact surface where the housing body and the end cover are adjacent to each other.

[0011] In a specific embodiment, the housing body seal includes a first housing body seal and a second housing body seal. The first housing body seal is located on the side of the through hole of the housing body close to the mounting plate, and the second housing body seal is located between the first housing body seal and the bearing; the through hole of the housing body is a stepped hole, and the diameter of the through hole of the housing body at the position of the first housing body seal is smaller than the diameter at the position of the second housing body seal.

[0012] In a specific embodiment, the housing body is provided with a lubricating oil hole in the radial direction, and the lubricating oil hole is communicated with the through hole of the housing body.

[0013] In a specific embodiment, the bearing includes a first bearing and a second bearing, and a shaft sleeve is provided between the first bearing and the second bearing on the rotating shaft.

[0014] The flap valve provided by the embodiment of the present application includes: a housing, a flap, and a driving device; wherein, the housing is a cylindrical structure with openings at both ends; the flap is arranged at the first opening end of the housing. The flap includes a rotating shaft and a valve plate. The rotating shaft is axially connected to the valve plate, and the rotating shaft is rotatably connected to the housing so as to be able to rotate around the axis of the rotating shaft. The valve plate is adapted to the shape of the first opening end. The flap is configured to conduct the first opening end by the valve plate at the first rotation angle of the rotating shaft, and block the first opening end by the valve plate at the second rotation angle of the rotating shaft; the driving device is configured to drive the rotating shaft to rotate so that the rotating shaft can at least rotate to the first rotation angle and the second rotation angle. The flap valve drives the rotating shaft to rotate through the driving device to open or close the valve plate connected to the rotating shaft, which can effectively improve the opening and closing speed of the flap valve and avoid jamming. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 A three-dimensional schematic diagram of a flap valve provided by an embodiment of the present application;

[0017] Figure 2 A top view schematic diagram of the flap valve provided by an embodiment of the present application;

[0018] Figure 3 A schematic diagram of the flap and drive device of the flap valve provided by an embodiment of the present application;

[0019] Figure 4 A schematic diagram of the rotating shaft, valve plate and backing plate of the flap valve provided by an embodiment of the present application;

[0020] Figure 5 A schematic diagram of the housing of the flap valve provided by an embodiment of the present application;

[0021] Figure 6 A partial schematic diagram of the bearing seat seal of the flap valve provided by an embodiment of the present application.

[0022] Main reference numeral description:

[0023] 1 - Flap valve; 10 - Housing; 101 - Flange; 102 - Feeding plate; 103 - Bearing seat; 1031 - Mounting plate; 1032 - Seat body; 10321 - Lubricating oil hole; 1033 - End cover; 1034 - Bearing; 1034a - First bearing; 1034b - Second bearing; 1035 - Seat body seal; 1035a - First seat body seal; 1035b - Second seat body seal; 1036 - End cover seal; 1037 - First end face seal; 1038 - Second end face seal; 1039 - Bush; 103a - First bearing seat; 103b - Second bearing seat; 20 - Flap; 201 - Rotating shaft; 202 - Valve plate; 203 - Backing plate; 30 - Drive device; 301 - Rocker arm; 302 - Linear motion mechanism; 3021 - Push rod; 303 - Mounting seat. Detailed implementation manners

[0024] The following will describe the embodiments of the present application in detail with reference to the drawings.

[0025] It should be clear that the described embodiments are only a part of the embodiments of this application, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0026] Currently, the valve structures used for filling materials often have a slow opening and closing speed, and it is easy for particles to fall in during the opening and closing process of the valve, resulting in valve jamming, which affects the normal progress of coal mine filling work. To solve this problem, as Figure 1 , Figure 2 shown, an embodiment of this application provides a flap valve 1, which may include: a housing 10, a flap 20, and a driving device 30.

[0027] The housing 10 is a cylindrical structure with openings at both ends. Under the action of the flap valve 1, materials can enter from the first opening end of the cylindrical structure of the housing 10 and flow out from the second opening end of the housing 10. In addition, the use of a cylindrical structure for the housing 10 facilitates connection with the upstream and downstream conveying pipelines of the filling materials. According to different usage scenarios, the shape of the housing 10 can specifically be a square cylinder or a circular cylinder, etc.

[0028] The flap 20 is arranged at the first opening end of the housing 10. The flap 20 includes a rotating shaft 201 and a valve plate 202. The rotating shaft 201 is axially connected to the valve plate 202, and the rotating shaft 201 is rotatably connected to the housing 10 to be able to rotate around the axis of the rotating shaft 201. The valve plate 202 is adapted to the shape of the first opening end. The flap 20 is configured such that the valve plate 202 conducts the first opening end at the first rotation angle of the rotating shaft 201 and blocks the first opening end at the second rotation angle of the rotating shaft 201. The flap 20 is arranged at the first opening end of the housing 10 to realize the opening and closing function of the flap valve 1. Specifically, when the rotating shaft 201 rotates to the first rotation angle, the valve plate 202 connected to the rotating shaft 201 quickly opens accordingly, so that the first opening end of the housing 10 is conducted, and materials can enter from the first opening end of the housing 10 and flow out from the second opening end of the housing 10. At this time, the flap 20 is in the open state; when the rotating shaft 201 rotates to the second rotation angle, the valve plate 202 connected to the rotating shaft 201 quickly closes accordingly, so that the first opening end of the housing 10 is blocked, and the materials are blocked outside the first opening end of the housing 10. At this time, the flap 20 is in the closed state.

[0029] The driving device 30 is configured to drive the rotating shaft 201 to rotate so that the rotating shaft 201 can at least rotate to the first rotation angle and the second rotation angle. In this example, the driving device 30 can select the corresponding driving method according to the actual working conditions. For example, in a dusty and noisy environment, a pneumatic method can be selected to achieve driving, and in a clean and quiet environment, an electric method can be selected to achieve driving.

[0030] The flap valve 1 provided by the embodiments of the present application includes: a housing 10, a flap 20, and a driving device 30; wherein, the housing 10 is a cylindrical structure with openings at both ends; the flap 20 is disposed at the first opening end of the housing 10, the flap 20 includes a rotating shaft 201 and a valve plate 202, the rotating shaft 201 is axially connected to the valve plate 202, and the rotating shaft 201 is rotatably connected to the housing 10 to be able to rotate around the axis of the rotating shaft 201, the valve plate 202 is adapted to the shape of the first opening end, and the flap 20 is configured to conduct the first opening end by the valve plate 202 at the first rotation angle of the rotating shaft 201, and block the first opening end by the valve plate 202 at the second rotation angle of the rotating shaft 201; the driving device 30 is configured to drive the rotating shaft 201 to rotate so that the rotating shaft 201 can at least rotate to the first rotation angle and the second rotation angle. The flap valve 1 drives the rotating shaft 201 to rotate through the driving device 30 to open or close the valve plate 202 connected to the rotating shaft 201, which can effectively improve the opening and closing speed of the valve of the flap valve 1 and avoid jamming.

[0031] To ensure the response speed of the rotating shaft 201 when switching between the first rotation angle and the second rotation angle and improve the rotation execution efficiency of the rotating shaft 201, as Figure 3 shown, optionally, in an embodiment of the present application, the driving device 30 includes a rocker arm 301 and a linear motion mechanism 302. The linear motion mechanism 302 is configured with a push rod 3021 that can reciprocate linearly, and the linear motion mechanism 302 is rotatably connected to the housing 10; the first end of the rocker arm 301 is connected to the rotating shaft 201, and the second end of the rocker arm 301 is rotatably connected to the end of the push rod 3021.

[0032] The linear motion mechanism 302 drives the rocker arm 301 to rotate the rotating shaft 201, which simplifies the intermediate transmission components, thereby improving the execution efficiency and response speed of the rotating shaft 201. In addition, using the rocker arm 301 to drive the rotating shaft 201 to rotate, the length of the rocker arm 301 can be designed according to the usage situation, so as to configure a corresponding torque for the rotating shaft 201. For example, when the rotating shaft 201 needs a larger torque to drive the valve plate 202 to open or close, a longer rocker arm 301 length can be designed to meet the usage requirements. In this example, the linear motion mechanism 302 can be rotatably connected to the housing 10 through a mounting seat 303. During the process of the push rod 3021 driving the rocker arm 301, it can rotate relative to the axis of the rotating shaft 201, so that the force application direction can be adjusted according to the change of the rotation connection position between the second end of the rocker arm 301 and the end of the push rod 3021, avoiding jamming and ensuring the smooth switching of the rotating shaft 201 between the first rotation angle and the second rotation angle. Specifically, the linear motion mechanism 302 can adopt mechanisms such as a cylinder, a linear motor, or a lead screw. The end of the push rod 3021 configured by the linear motion mechanism 302 can be designed as a fork-shaped structure, and this fork-shaped structure holds the second end of the rocker arm 301 and realizes the rotational connection by passing through a pin.

[0033] Since the outer wall of the rotating shaft 201 is a cylindrical surface, it is difficult to form a force-bearing surface when directly connected to the valve plate 202, and it is also inconvenient for installation, disassembly and replacement. Therefore, optionally, as Figure 4 shown, in an embodiment of the present application, a planar structure is provided along the axial direction on the outer wall of the rotating shaft 201, and a backing plate 203 is connected to the planar structure, and the valve plate 202 is detachably connected to the backing plate 203.

[0034] By providing a planar structure on the outer wall of the rotating shaft 201, the planar structure can form a more stable force-bearing surface or connection surface with the connected backing plate 203. The rotating shaft 201 can be detachably connected to the backing plate 203 through the planar structure and drive the backing plate 203 to rotate, or the rotating shaft 201 can be welded to the backing plate 203 through the planar structure and drive the backing plate 203 to rotate. It can be understood that since the size and shape of the backing plate 203 can be adaptively designed, the structural limitation of the outer wall of the rotating shaft 201 can be compensated. Through the backing plate 203, a more stable and convenient detachable connection of the valve plate 202 can be achieved.

[0035] Optionally, as Figure 5 shown, in an embodiment of the present application, the housing 10 is provided with a flange 101 at the first opening end; and / or a material guiding plate 102 is provided circumferentially in the cavity of the housing 10 at the first opening end. At the second rotation angle of the rotating shaft 201, the material guiding plate 102 encloses the valve plate 202 and forms a buffer tank with the valve plate 202.

[0036] In this embodiment, a flange 101 is provided at the first opening end of the housing 10, which is convenient for connection with the conveying pipeline, and the flange 101 and the housing 10 are fixedly connected by a rib plate. In addition, to facilitate the smooth entry of materials from the first opening end of the housing 10, a material guiding plate 102 is provided circumferentially in the cavity of the housing 10 at the first opening end. At the second rotation angle of the rotating shaft 201, the material guiding plate 102 encloses the valve plate 202 and forms a buffer tank with the valve plate 202. In this way, when the material is conveyed from top to bottom, when the flap 20 is switched from the open state to the closed state under the action of the driving device 30, some of the materials conveyed by the upstream pipeline will accumulate outside the valve plate 202. If the liquid content of the material is relatively high, the liquid may seep out of the pipe along the flange 101 connection part at the first opening end. Therefore, in the present application, at the second rotation angle of the rotating shaft 201, that is, when the flap 20 is in the closed state, the material guiding plate 102 and the valve plate 202 enclose to form a buffer tank, which can receive and buffer the materials or the seepage liquid and prevent it from seeping out of the pipe. Specifically, in the direction from the first opening end to the second opening end of the housing 10, the circumferential enclosing cross-section of the material guiding plate 102 can gradually decrease to form a funnel-shaped structure, so as to facilitate the guiding and conveying of the materials.

[0037] To prevent the power part of the flap valve 1 from being blocked by materials, optionally, in an embodiment of the present application, bearing seats 103 are respectively provided on both sides of the first opening end of the housing 10, and the rotating shaft 201 is passed through the bearing seats 103. It can be understood that since the bearing seats 103 are arranged on both sides of the first opening end of the housing 10, it is possible to prevent the materials in the housing 10 from entering the bearing seats 103 and causing rotational blockage. The rotating shaft 201 can be passed through the bearing seats 103 on both sides of the first opening end of the housing 10, such as Figure 2 , Figure 3 , Figure 4 shown by the first bearing seat 103a and the second bearing seat 103b, to form a force support, and then one end of the rotating shaft 201 can be connected to the above-mentioned rocker arm 301, and a linear motion mechanism 302 rotatably connected to the rocker arm 301. Specifically, one end of the rotating shaft 201 can be designed as a square head end, and the first end of the rocker arm 301 can be inserted into the square head end of the rotating shaft 201 and locked and limited by gaskets and bolts, and fixedly connected in a detachable manner.

[0038] Optionally, in an embodiment of the present application, the bearing seat 103 includes a mounting plate 1031, a seat body 1032, and an end cover 1033 that are sequentially adjacent to each other. The mounting plate 1031, the seat body 1032, and the end cover 1033 are respectively provided with through holes along the passing direction of the rotating shaft 201. A bearing 1034 is embedded in the through hole of the seat body 1032, and the mounting plate 1031 is connected to the housing 10. As Figure 6 shown, the bearing seat 103 can be detachably connected to the housing 10 through the mounting plate 1031 by bolts or the like, providing a bearing and protection function for internal rotating components such as the bearing 1034. To further improve the protection ability against foreign objects and prevent conveying materials, etc. from entering the inside of the bearing seat 103 and affecting the normal operation of the bearing 1034, optionally, in an embodiment of the present application, a seat body seal 1035 is provided in the through hole of the seat body 1032 between the mounting plate 1031 and the bearing 1034; and / or an end cover seal 1036 is provided in the through hole of the end cover 1033; and / or a first end face seal 1037 is provided on the contact surface where the seat body 1032 and the mounting plate 1031 are adjacent; and / or a second end face seal 1038 is provided on the contact surface where the seat body 1032 and the end cover 1033 are adjacent.

[0039] It can be understood that the housing seal 1035 and the end cover seal 1036 can form axial sealing protection for the bearing housing 103, preventing foreign objects from entering the interior of the housing 1032 axially. The first end face seal 1037 and the second end face seal 1038 can form radial sealing protection for the bearing housing 103, preventing foreign objects from entering the interior of the housing 1032 radially. Thus, an all-round sealing protection can be constructed for the bearing 1034 embedded in the perforation of the housing 1032, improving the operating reliability of the bearing 1034. When configuring the first end face seal 1037 and the second end face seal 1038, sealing grooves can be respectively opened at both end faces of the housing 1032, and the first end face seal 1037 and the second end face seal 1038, such as O-ring seals, etc., can be arranged in the sealing grooves.

[0040] Optionally, in an embodiment of the present application, the housing seal 1035 includes a first housing seal 1035a and a second housing seal 1035b. The first housing seal 1035a is located on the side of the perforation of the housing 1032 close to the mounting plate 1031, and the second housing seal 1035b is located between the first housing seal 1035a and the bearing 1034; the perforation of the housing 1032 is a stepped hole, and the aperture of the perforation of the housing 1032 at the position of the first housing seal 1035a is smaller than the aperture at the position of the second housing seal 1035b. It can be understood that since materials are conveyed in the housing 10, two seals are provided on the side close to the housing 10, that is, between the housing 1032 of the bearing housing 103 and the mounting plate 1031: the first housing seal 1035a, such as an A-type dust-proof sealing ring, and the second housing seal 1035b, such as a shaft-mounted Yx-shaped sealing ring, can construct a more reliable sealing protection effect, preventing foreign objects from entering the bearing 1034 on the side of the bearing housing 103 close to the material conveyance and causing jamming of the bearing 1034. In addition, the perforation of the housing 1032 is configured in a stepped hole manner to install the first housing seal 1035a and the second housing seal 1035b, which can further form a labyrinth sealing effect and improve the sealing and dust-proof effect.

[0041] Optionally, in an embodiment of the present application, the seat body 1032 is provided with a lubricating oil hole in the radial direction, and the lubricating oil hole communicates with the perforation of the seat body 1032. Lubricating grease and the like can be injected into the bearing 1034 in the seat body 1032 through the lubricating oil hole. For example, an oil cup can be set for the lubricating oil hole to improve the lubrication ability and maintainability of the bearing 1034. Optionally, in an embodiment of the present application, the bearing 1034 includes a first bearing 1034a and a second bearing 1034b, and a shaft sleeve 1039 is provided between the first bearing 1034a and the second bearing 1034b on the rotating shaft 201. The first bearing 1034a and the second bearing 1034b can adopt deep groove ball bearings, and the lubricating oil hole can be opened in the radial direction of the seat body 1032 at a position between the first bearing 1034a and the second bearing 1034b, so that the lubricating grease can lubricate the first bearing 1034a and the second bearing 1034b simultaneously.

[0042] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0043] The above content has described the embodiments of the present application in detail. Those skilled in the art can design and modify the device and its usage mode within the scope of the present application according to the on-site construction situation.

[0044] Each embodiment in this specification is described in a related manner. The same or similar parts between each embodiment can be referred to each other, and the key point of each embodiment is to illustrate the differences from other embodiments.

[0045] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A flap valve, characterized in that: include: A shell, wherein the shell is a cylindrical structure with openings at both ends; A flap, the flap is arranged at the first open end of the shell, the flap comprises a rotating shaft and a valve plate, the rotating shaft is axially connected to the valve plate, and the rotating shaft is rotatably connected to the shell so as to be rotatable around the axis of the rotating shaft, the valve plate is adapted to the shape of the first open end, the flap is configured such that the valve plate conducts to the first open end at a first rotation angle of the rotating shaft, and the valve plate blocks the first open end at a second rotation angle of the rotating shaft; A driving device is configured to drive the rotating shaft to rotate so that the rotating shaft can at least rotate to the first rotation angle and the second rotation angle.

2. The flap valve according to claim 1, characterized in that: The driving device includes a rocker arm and a linear motion mechanism. The linear motion mechanism is equipped with a push rod that can reciprocate linearly and is rotatably connected to the shell. The first end of the rocker arm is connected to the rotating shaft, and the second end of the rocker arm is rotatably connected to the end of the push rod.

3. The flap valve according to claim 1, characterized in that: The outer wall of the rotating shaft is provided with a plane structure along the axial direction, the plane structure is connected with a pad, and the valve plate is detachably connected to the pad.

4. The flap valve according to claim 1, characterized in that: The housing is provided with a flange at the first opening end; and / or The shell is provided with a material guide plate along the circumferential direction in a cavity located at the first opening end. At the second rotation angle of the rotating shaft, the material guide plate encloses the valve plate and forms a buffer groove with the valve plate.

5. The flap valve according to claim 1, characterized in that: Bearing seats are respectively arranged on both sides of the first opening end of the shell, and the rotating shaft passes through the bearing seats.

6. The flap valve according to claim 5, characterized in that: The bearing seat includes a mounting plate, a seat body, and an end cover which are adjacent to each other in sequence. The mounting plate, the seat body, and the end cover are respectively provided with through holes along the penetration direction of the rotating shaft. A bearing is embedded in the through hole of the seat body. The mounting plate is connected to the shell.

7. The flap valve according to claim 6, characterized in that: The through hole of the seat body is provided with a seat body seal between the mounting plate and the bearing; and / or An end cap seal is provided in the perforation of the end cap; and / or A first end face seal is provided on the adjacent contact surface between the seat body and the mounting plate; and / or A second end face seal is provided on the adjacent contact surface between the seat body and the end cover.

8. The flap valve according to claim 7, characterized in that: The seat body seal includes a first seat body seal and a second seat body seal, the first seat body seal is located on the side of the seat body through hole close to the mounting plate, and the second seat body seal is located between the first seat body seal and the bearing; the seat body through hole is a stepped hole, and the aperture of the seat body through hole at the first seat body seal position is smaller than the aperture of the second seat body seal position.

9. The flap valve according to claim 6, characterized in that: The seat body is provided with a lubricating oil hole in the radial direction, and the lubricating oil hole is communicated with the through hole of the seat body.

10. The flap valve according to claim 6, characterized in that: The bearing comprises a first bearing and a second bearing, and the rotating shaft is provided with a sleeve between the first bearing and the second bearing.

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