A one-way damping chock for an underwater winch

Abstract

A one-way damping fairlead device for underwater winch, comprising a frame assembly on which a cable pressing mechanism and a guide wheel assembly are mounted, the frame assembly is structured as comprising frame side plates distributed at intervals, a plurality of guide bushings and a transmission screw bushing are arranged on the frame side plates penetrating and connecting two sides, the cable pressing mechanism is structured as comprising a limiting roller shaft and a cable pressing roller shaft, the limiting roller shaft is mounted with limiting rollers, the cable pressing roller shaft is mounted with cable pressing rollers, further comprising a pre-tightening connecting rod, the pre-tightening connecting rod, the cable pressing roller shaft and the cable pressing rollers are combined as a whole and swing around the limiting roller shaft, the guide wheel assembly is structured as comprising a pulley shaft, a guide pulley is mounted on the pulley shaft through a one-way rolling bearing, when the winch is paying out a cable, the device rotates flexibly with small resistance, when the winch is taking in a cable, the device provides certain resistance on the steel cable fairlead path, maintains certain cable taking-in tension of the steel cable, in addition, the device is also suitable for high-speed heavy-load, deep-sea high-pressure working environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diving equipment, in particular to a one-way damping cable guide and rope arrangement for underwater winch. BACKGROUND

[0002] The underwater winch is equipped in diving equipment and works in deep sea environment. The diving equipment is laid back by deck winch of mother ship, the underwater winch winds up the steel cable to guide the diving equipment to approach the underwater target (the end of the steel cable is connected with the underwater target) along the steel cable path, and assists the diving equipment to dock with the target, the deck winch, the diving equipment and the underwater target are connected in series by armored cable and steel cable.

[0003] The cable laying function of the underwater winch is realized by the deck winch, specifically, the deck winch retracts the cable, and the underwater winch is passively laid out under the action of water surface tension, which requires that the related cable guide device on the steel cable path of the underwater winch has small flexible resistance; when the underwater winch retracts the cable, the steel cable needs to maintain a certain tension to ensure that the cable storage is neat, and the related cable guide device on the cable path of the underwater winch needs to provide a certain cable retraction resistance. The underwater winch works in deep sea environment under high speed and heavy load, and the requirements of corrosion resistance and pressure bearing need to be fully considered. The general cable guide mechanism on land cannot meet the use requirements. SUMMARY

[0004] In view of the above-mentioned shortcomings in the prior art, the present application provides a one-way damping cable guide and rope arrangement for underwater winch, so that when the winch lays out the cable, the device has small flexible resistance in rotation, when the winch retracts the cable, the device provides a certain resistance on the steel cable guide path, maintains a certain cable retraction tension of the steel cable, and in addition, the device is also suitable for high speed, heavy load and deep sea high pressure working environment.

[0005] The technical scheme adopted by the present application is as follows:

[0006] A one-way damping cable guide and rope arrangement for underwater winch, comprising a frame assembly, a cable pressing mechanism and a guide wheel assembly are installed on the frame assembly,

[0007] The structure of the frame assembly comprises frame side plates distributed at intervals, the bottom front end and the upper rear end of the frame side plates are respectively installed with limit racks through fasteners, and the inlet end and the outlet end of the steel cable are formed at the limit racks; a plurality of guide bushings and a transmission screw bushing are arranged on the frame side plates penetrating and connecting the two sides, the guide bushings cooperate with the winch guide rod to play a guiding role, and the transmission screw bushing cooperates with the winch screw to drive the cable guide and rope arrangement to reciprocate along the winch guide rod;

[0008] The structure of the cable pressing mechanism comprises a limiting roller shaft and a cable pressing roller shaft penetrating the frame side plate, a limiting roller is installed on the limiting roller shaft, a cable pressing roller is installed on the cable pressing roller shaft, a pre-tightening connecting rod is installed between the limiting roller shaft and the cable pressing roller shaft, the pre-tightening connecting rod, the cable pressing roller shaft and the cable pressing roller are combined as a whole and swing around the limiting roller shaft, a pre-tightening spring and a pre-tightening screw are installed at the end of the pre-tightening connecting rod, and the pre-tightening screw adjusts the pressure of the pre-tightening spring acting on the end of the pre-tightening connecting rod.

[0009] The structure of the guide wheel assembly comprises a pulley shaft, a guide pulley is installed on the pulley shaft through a one-way rolling bearing,

[0010] When the winch releases the cable, the guide pulley, the bearing seat and the outer ring of the one-way rolling bearing form a whole motion unit and freely rotate around the inner ring of the one-way rolling bearing and the pulley shaft;

[0011] When the winch retracts the cable, the guide pulley, the bearing seat, the one-way rolling bearing and the pulley shaft form a whole motion unit and rotate around the frame assembly, and at the same time, the metal friction plates at both ends of the pulley shaft rotate relative to the nylon damping plates to provide resistance for the winch to retract the cable.

[0012] Further technical solutions thereof are as follows:

[0013] The frame assembly is matched with the winch guide rod and the transmission screw rod to play a guiding and cable arranging role.

[0014] The frame assembly is the mounting base of the cable pressing mechanism and the guide wheel assembly.

[0015] The limiting frame adopts a split structure, and the cross section of the limiting frame is in a "┏┓" structure.

[0016] The pre-tightening connecting rod is a lever, and the amplified pre-tightening force is applied to the steel cable and the guide pulley through the cable pressing roller.

[0017] The inner hole of the guide pulley is matched with the outer ring of the one-way rolling bearing.

[0018] The guide wheel assembly further comprises a bearing seat side plate, the bearing seat side plate is provided in two parts and symmetrically arranged on both sides of the guide pulley and fastened by screws, the lugs of the bearing seat side plate are matched with the inner hole of the guide pulley and axially position the outer ring of the one-way rolling bearing.

[0019] The pulley shaft is supported and rotated by the sliding bearings at both ends, the sliding bearings are interference-fitted with the shaft holes of the reinforcing ring, the reinforcing ring is embedded in the corresponding holes of the frame side plate and fixed, the nylon damping plate is fastened on the flange of the reinforcing ring by screws, the metal friction plate is attached to the nylon damping plate, and the metal friction plate is located at both ends of the pulley shaft.

[0020] The left side of the pulley shaft is sequentially provided with a spring cover, a spring body and a pre-tightening nut, the two ends of the spring body are connected with a metal friction plate and the spring cover respectively, and the pre-tightening force is transmitted to the metal friction plate and a nylon damping plate, so as to adjust the friction torque.

[0021] A series of metal filter cores are uniformly arranged in the circumferential direction of the bearing seat side plate.

[0022] The present application has the following advantages:

[0023] The present application has the following advantages:

[0024] Meanwhile, the present application has the following advantages:

[0025] (1) The one-way damping cable guiding and rope arranging device is provided with a cable pressing mechanism and a guiding wheel assembly, the steel cable is always in contact with the guiding wheel and maintains a proper pre-pressure, the pre-pressure can be adjusted according to actual requirements, and the guiding wheel follows the steel cable during the process of the winch winding and unwinding the cable without slipping.

[0026] (2) The cavity structure of the closed one-way rolling bearing is provided with a series of stainless steel filter cores, seawater can freely enter and exit, the high-viscosity lubricating grease is effectively isolated in the cavity, the pressure inside and outside the cavity is balanced, the one-way rolling bearing is effectively lubricated and corrosion-proofed, and the cavity does not need to be designed as a pressure-resistant structure, or additional compensators and high-pressure dynamic sealing rings are needed, or stainless steel bearings and sliding bearings are used, so that the structural composition is simplified, and the movement flexibility and load capacity of the guide wheel assembly are improved.

[0027] (3) The device has simple structure, high integration and small occupied space, and is easy to be modified on a general winch rope dispenser. The device has high popularization and application value, and the function of the device is easy to expand, so that the device can be applied and expanded in the winch field. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic view of the present application.

[0029] Figure 2 is a front view of the present application.

[0030] Figure 3 is Figure 2 a full cross-sectional view along section A-A.

[0031] Figure 4 is Figure 3 a partial view.

[0032] Figure 5 is Figure 2 a full cross-sectional view along section B-B.

[0033] Wherein: 1, frame assembly; 2, cable pressing mechanism; 3, guide wheel assembly;

[0034] 101, limiting frame; 102, guide bushing; 103, transmission screw bushing; 104, frame side plate;

[0035] 201, limiting roller shaft; 202, limiting roller; 203, pre-tightening connecting rod; 204, cable pressing roller shaft; 205, cable pressing roller; 206, pre-tightening spring; 207, pre-tightening screw;

[0036] 301, guide pulley; 302, bearing seat side plate; 303, reinforcing ring; 304, key; 305, pulley shaft; 306, sliding bearing; 307, nylon damping plate; 308, metal friction plate; 309, one-way rolling bearing; 310, shaft sleeve; 311, spring gland; 312, spring body; 313, TC shaft seal; 314, metal filter core. DETAILED DESCRIPTION

[0037] The specific embodiments of the present application will be described below in conjunction with the drawings.

[0038] As Figures 1-5 shown, the unidirectional damping fairlead device for underwater winch of the embodiment comprises a frame assembly 1, a cable pressing mechanism 2 and a guide wheel assembly 3 are installed on the frame assembly 1,

[0039] The structure of the frame assembly 1 is as follows: frame side plates 104 are spacedly distributed, the bottom front end and the upper rear end of the frame side plate 104 are respectively installed with a limiting frame 101 through fasteners, and the limiting frame 101 forms the inlet end and the outlet end of the steel cable; a plurality of guide bushings 102 and a transmission screw bushing 103 are arranged on the frame side plates 104 penetrating and connecting the two sides, the guide bushing 102 cooperates with the winch guide rod to play a guiding role, and the transmission screw bushing 103 cooperates with the winch screw to drive the fairlead device to reciprocate along the winch guide rod;

[0040] The structure of the cable pressing mechanism 2 is as follows: a limiting roller shaft 201 and a cable pressing roller shaft 204 penetrating the frame side plate 104, a limiting roller 202 is installed on the limiting roller shaft 201, a cable pressing roller 205 is installed on the cable pressing roller shaft 204, a pre-tightening connecting rod 203 is installed between the limiting roller shaft 201 and the cable pressing roller shaft 204, the pre-tightening connecting rod 203, the cable pressing roller shaft 204 and the cable pressing roller 205 are combined as a whole and swing around the limiting roller shaft 201; a pre-tightening spring 206 and a pre-tightening screw 207 are installed at the end of the pre-tightening connecting rod 203, and the pre-tightening screw 207 adjusts the pressure of the pre-tightening spring 206 acting on the end of the pre-tightening connecting rod 203;

[0041] The structure of the guide wheel assembly 3 is as follows: a pulley shaft 305, a guide pulley 301 is installed on the pulley shaft 305 through a one-way rolling bearing 309,

[0042] When the winch is paying out the cable, the guide pulley 301, the bearing seat and the outer ring of the one-way rolling bearing 309 form a whole motion unit, and freely rotate around the inner ring of the one-way rolling bearing 309 and the pulley shaft;

[0043] When the winch is taking in the cable, the guide pulley 301, the bearing seat, the one-way rolling bearing 309 and the pulley shaft 305 form a whole motion unit, and rotate around the frame assembly 1, at the same time, the metal friction plates 308 at both ends of the pulley shaft 305 are driven to rotate relative to the nylon damping plates 307, thereby providing resistance for the winch to take in the cable.

[0044] The frame assembly 1 is adapted to the winch guide rod and the transmission screw, and plays a guiding and cable arranging role.

[0045] The frame assembly 1 is the installation base of the cable pressing mechanism 2 and the guide wheel assembly 3.

[0046] The limiting frame 101 adopts a split structure, and the cross section of the limiting frame 101 is in a “┏┓” structure.

[0047] The pre-tightening connecting rod 203 is a lever, and the amplified pre-tightening force is applied to the steel cable and the guide pulley 301 through the pressure cable roller 205.

[0048] The inner hole of the guide pulley 301 is matched with the outer ring of the one-way rolling bearing 309.

[0049] The guide wheel assembly 3 further comprises bearing seat side plates 302, two of which are symmetrically arranged on the two sides of the guide pulley 301 and fastened by screws, the lugs of the bearing seat side plates 302 are matched with the inner holes of the guide pulley 301 and axially position the outer rings of the one-way rolling bearings 309.

[0050] The pulley shaft 305 is supported and rotated by the sliding bearings 306 at both ends, the sliding bearings 306 are in interference fit with the shaft holes of the reinforcing ring 303, the reinforcing ring 303 is embedded into the corresponding holes of the frame side plates 104 and fixed, the nylon damping plate 307 is fastened to the flange of the reinforcing ring 303 by screws, the metal friction plate 308 is attached to the nylon damping plate 307, and the metal friction plate 308 is located at both ends of the pulley shaft 305.

[0051] The spring body 312 is connected to the metal friction plate 308 and the spring gland 311 at both ends respectively, and transmits the pre-tightening force to the metal friction plate 308 and the nylon damping plate 307, so as to adjust the friction torque.

[0052] A series of metal filter cores 314 are uniformly arranged in the circumferential direction of the bearing seat side plate 302.

[0053] The specific structure and function of the one-way damping guide cable arrangement device for the underwater winch are as follows:

[0054] Figure 1 It is a guide cable arrangement device composition diagram according to the application, Figure 2 It is a front view of the guide cable arrangement device, which is composed of a frame assembly 1, a cable pressing mechanism 2 and a guide wheel assembly 3 and the like modules.

[0055] The frame assembly 1 is composed of a limiting frame 101, a guide bushing 102, a transmission screw bushing 103 and a frame side plate 104 and the like parts.

[0056] The limiting frame 101 is provided with two limiting frames, which are respectively arranged at the inlet end and the outlet end of the frame assembly 1, and which guide and limit the steel cable to prevent the phenomena of cable abrasion and cable jumping.

[0057] The guide bushing 102 is provided with three guide bushings, which penetrate and connect the frame side plates 104 on both sides, and the guide bushing 102 cooperates with the winch guide rod to play a guiding role.

[0058] The transmission screw bushing 103 cooperates with the winch screw to drive the cable guide to reciprocate along the winch guide rod.

[0059] The frame side plate 104 is the main structure of the frame assembly 1, which constitutes the installation base of the cable pressing mechanism 2 and the guide wheel assembly 3.

[0060] The cable pressing mechanism 2 is composed of a limiting roller shaft 201, a limiting roller 202, a pre-tightening connecting rod 203, a cable pressing roller shaft 204, a cable pressing roller 205, a pre-tightening spring 206 and a pre-tightening screw 207.

[0061] The limiting roller shaft 201 and the cable pressing roller shaft 204 both penetrate through the frame assembly 1, the limiting roller 202 rotates around the limiting roller shaft 201 to limit the steel cable and prevent it from jumping out of the guide sheave 301 when it is slack.

[0062] The cable pressing roller 205 rotates around the cable pressing roller shaft 204, and the pre-tightening connecting rod 203, the cable pressing roller shaft 204 and the cable pressing roller 205 are combined as a whole to swing around the limiting roller shaft 201.

[0063] The pre-tightening spring 206 and the pre-tightening screw 207 are located at the end of the pre-tightening connecting rod 203, the pre-tightening screw 207 adjusts the pressure of the pre-tightening spring 206 acting on the end of the pre-tightening connecting rod 203, and the pre-tightening connecting rod 203 is a lever that amplifies the pre-tightening force and applies it to the steel cable and the guide sheave 301 through the cable pressing roller 205.

[0064] Figure 3 is a component diagram of the guide sheave 301, Figure 4 is a B-B cross-sectional view shown in the main view of the cable guide, the guide wheel assembly 3 penetrates through the frame assembly 1 and takes the frame assembly 1 as the installation base.

[0065] The guide wheel assembly 3 is composed of a guide sheave 301, a bearing seat side plate 302, a reinforcing ring 303, a key 304, a sheave shaft 305, a sliding bearing 306, a nylon damping plate 307, a metal friction plate 308, a one-way rolling bearing 309, a shaft sleeve 310, a spring gland 311, a spring body 312, a TC shaft seal 313 and a metal filter element 314.

[0066] The inner hole of the guide sheave 301 cooperates with the outer ring of the one-way rolling bearing 309, and the two are connected by a flat key;

[0067] The bearing seat side plate 302 is arranged symmetrically on both sides of the guide sheave 301 and is fastened by screws, the lug of the bearing seat side plate 302 cooperates with the inner hole of the guide sheave 301 and axially positions the outer ring of the one-way rolling bearing 309.

[0068] When the winch is paying out cable, the one-way rolling bearing 309 is free to rotate, the guide pulley 301, the bearing seat side plate 302 and the outer ring of the one-way rolling bearing 309 form an integral unit and rotate around the inner ring of the one-way rolling bearing 309.

[0069] The inner ring of the one-way rolling bearing 309 and the pulley shaft 305 are connected by a flat key, the pulley shaft 305 is supported by and rotates around the sliding bearing 306 at its two ends, the sliding bearing 306 is in interference fit with the shaft hole of the reinforcing ring 303, the reinforcing ring 303 is embedded in the corresponding hole of the frame side plate 104 and fixedly connected thereto, the nylon damping plate 307 is fastened to the flange of the reinforcing ring 303 by screws, the metal friction plate 308 is attached to the nylon damping plate 307, and the metal friction plate 308 is located at the two ends of the pulley shaft 305 and connected thereto through rectangular holes.

[0070] The spring retainer 311, the spring body 312 and the pre-tightening nut are installed in sequence on the left side of the pulley shaft 305, the spring body 312 is connected to the metal friction plate 308 and the spring retainer 311 at its two ends respectively, and transmits the pre-tightening force to the metal friction plate 308 and the nylon damping plate 307, so as to adjust the friction torque.

[0071] When the winch is taking in cable, the one-way rolling bearing 309 is locked, the guide pulley 301, the bearing seat side plate 302, the one-way rolling bearing 309, the pulley shaft 305, the metal friction plate 308, the spring retainer 311 and the spring body 312 form an integral unit and rotate around the sliding bearing 306, the reinforcing ring 303, the nylon damping plate 307 and the corresponding mounting hole of the frame side plate 104, and the relative rotation of the metal friction plate 308 and the nylon damping plate 307 provides resistance to the winch taking in cable.

[0072] The guide pulley 301, the bearing seat side plate 302, the one-way rolling bearing 309, the shaft sleeve 310 and the pulley shaft 305 form a relatively rotatable sealed cavity by O-rings, TC shaft seals 313 and other sealing elements, the cavity is filled with high-viscosity grease for lubrication and corrosion protection of the one-way rolling bearing 309.

[0073] A series of stainless steel metal filter cartridges 314 are uniformly arranged in the circumferential direction of the bearing seat side plate 302, the internal filter of the metal filter cartridge 314 is sintered from stainless steel powder, and a filter with appropriate filtering accuracy can ensure that external seawater can freely enter and exit, and the grease is isolated in the cavity and cannot pass through the metal filter cartridge 314.

[0074] When the underwater winch is submerged, seawater enters the cavity through the metal filter 314 and back-flushes the filter surface on the inner side of the cavity wall, preventing blockage and maintaining pressure balance between the inside and outside of the cavity; when the underwater winch is surfaced, seawater in the cavity is discharged through the metal filter 314, maintaining pressure balance between the inside and outside of the cavity. The metal filter 314 of stainless steel is simple in structure and easy to install, avoiding the setting of the above cavity as a pressure-resistant structure, and the dynamic sealing surface can be selected as a low-resistance low-pressure sealing ring in the structure form of the TC shaft seal 313, which is simple in structure, flexible and efficient in mechanism operation, and suitable for deep-sea high-speed heavy-load working conditions.

[0075] The above description is an explanation of the application, not a limitation of the application, and the scope of the application is defined in the claims. Within the protection scope of the application, any form of modification can be made.

Claims

1. A one-way damped chock for an underwater winch, characterized in that: The application relates to a frame assembly (1) which is provided with a pressure cable mechanism (2) and a guide wheel assembly (3), wherein the frame assembly (1) comprises frame side plates (104) which are arranged at intervals, the bottom front end and the upper rear end of the frame side plates (104) are respectively provided with limiting racks (101) through fasteners, and the limiting racks (101) form the inlet end and the outlet end of the steel cable; a plurality of guide bushings (102) and a transmission screw bushing (103) are arranged on the frame side plates (104) which are penetrated and connected, the guide bushings (102) are matched with the winch guide rods and play a guiding role, and the transmission screw bushing (103) is matched with the winch screw and drives the guide cable rope arranging device to reciprocate along the winch guide rod. The pressure cable mechanism (2) comprises limiting roller shafts (201) and pressure cable roller shafts (204) which are penetrated through the frame side plates (104), the limiting roller shafts (201) are provided with limiting rollers (202), the pressure cable roller shafts (204) are provided with pressure cable rollers (205), the limiting roller shafts (201) and the pressure cable roller shafts (204) are provided with pre-tightening connecting rods (203), the pre-tightening connecting rods (203), the pressure cable roller shafts (204) and the pressure cable rollers (205) are combined into an integral whole and swing around the limiting roller shafts (201), the pre-tightening connecting rods (203) are provided with pre-tightening springs (206) and pre-tightening screws (207) at the ends, and the pre-tightening screws (207) adjust the pressure of the pre-tightening springs (206) acting on the ends of the pre-tightening connecting rods (203). The guide wheel assembly (3) comprises a pulley shaft (305), the pulley shaft (305) is provided with guide pulleys (301) through one-way rolling bearings (309), the guide pulleys (301) are matched with the winch guide rods, the guide pulleys (301) are provided with bearing seats and the one-way rolling bearings (309) are provided with outer rings, the guide pulleys (301), the bearing seats and the outer rings of the one-way rolling bearings (309) form an integral motion unit, and the guide pulleys (301) freely rotate around the inner rings of the one-way rolling bearings (309) and the pulley shaft. When the winch releases the cable, the guide pulleys (301), the bearing seats and the outer rings of the one-way rolling bearings (309) form an integral motion unit and freely rotate around the inner rings of the one-way rolling bearings (309) and the pulley shaft. When the winch winds the cable, the guide pulleys (301), the bearing seats, the one-way rolling bearings (309) and the pulley shaft (305) form an integral motion unit and rotate around the frame assembly (1), meanwhile, the metal friction plates (308) at the two ends of the pulley shaft (305) rotate relative to the nylon damping plates (307), and resistance is provided for the winch to wind the cable.

2. A one-way damped chock for underwater winches as claimed in claim 1, characterized in that: The frame assembly (1) is matched with the winch guide rods and the transmission screw and plays a guiding and cable arranging role.

3. A one-way, damped chock for underwater winches as claimed in claim 1, characterized in that: The frame assembly (1) is the mounting base of the pressure cable mechanism (2) and the guide wheel assembly (3).

4. A one-way, damped chock for underwater winches as claimed in claim 1, characterized in that: The limiting racks (101) adopt a split structure and the cross section of the limiting racks (101) is in a "┏┓" structure.

5. A one-way, damped chock for underwater winches as claimed in claim 1, characterized in that: The pre-tightening connecting rods (203) are levers, the amplified pre-tightening force is applied to the steel cable and the guide pulley (301) through the pressure cable rollers (205).

6. A one-way, damped chock for underwater winches as claimed in claim 1, characterized in that: The inner hole of the guide pulley (301) is matched with the outer ring of the one-way rolling bearing (309).

7. A one-way, damped chock for underwater winches as claimed in claim 1, characterized in that: The guide wheel assembly (3) further comprises two bearing seat side plates (302) symmetrically arranged on both sides of the guide pulley (301) and fastened by screws, the lugs of the bearing seat side plates (302) are matched with the inner holes of the guide pulley (301) and axially position the outer rings of the one-way rolling bearings (309).

8. A one-way, damped chock for underwater winches as claimed in claim 1, characterized in that: The pulley shaft (305) is supported and rotated by the sliding bearings (306) at both ends, the sliding bearings (306) are interference-fitted with the shaft holes of the reinforcing ring (303), the reinforcing ring (303) is embedded into the corresponding holes of the frame side plates (104) and fixed, the nylon damping plate (307) is fastened on the flange of the reinforcing ring (303) by screws, the metal friction plate (308) is attached to the nylon damping plate (307), and the metal friction plate (308) is located at both ends of the pulley shaft (305).

9. A one-way, damped chock for underwater winches as claimed in claim 1, characterized in that: A spring gland (311), a spring body (312) and a pre-tightening nut are sequentially installed on the left side of the pulley shaft (305), the spring body (312) is connected with the metal friction plate (308) and the spring gland (311) at both ends, and transmits the pre-tightening force to the metal friction plate (308) and the nylon damping plate (307) to adjust the friction torque.

10. A one-way, damped chock for an underwater winch as claimed in claim 7, characterized in that: A series of metal filter cartridges (314) are uniformly arranged in the circumferential direction of the bearing seat side plates (302).

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