Fastener for railway motor axle suspension bush

Abstract

The utility model provides a fastener for a railway motor axle suspension bush, which belongs to the technical field of fastening equipment, a bolt is of a solid structure, one end of the bolt is provided with a first thread, the other end of the bolt is provided with a second thread, the second thread is matched with a nut, one side of a gasket is provided with a plurality of special-shaped thorns, and the special-shaped thorns are matched with the nut. A plurality of ratchets distributed in the circumferential direction are arranged on the other side of the gasket, the special-shaped thorns on the gasket are pushed to abut against the surface of a bearing bush shell by screwing the nut, the rotating direction of the ratchets is consistent with the screwing direction of the nut, and a certain strength requirement of the bolt can be provided by arranging the solid bolt. By arranging the special-shaped thorns and the ratchets, the fastening effect of the bolt and the nut can be improved, meanwhile, nut loosening caused by vibration is prevented, in addition, the fastener saves the steps of cleaning, drying and thorough solidification of glue, and the fastener is convenient to mount and dismount and low in cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of fastening equipment, in particular to a fastener for railway motor bearing bushings. Background Art

[0002] The bearing bush is one of the key components of the motor. Usually, the motor shaft of the locomotive is connected to the suspension of the car body by rolling bearings or sliding bearings. The sliding bearing connection has the characteristics of high bearing capacity, good shock resistance, stable and reliable operation, low noise, and long life. At present, the bearing bush structure of traction motors in my country adopts the form of copper backing and tin-based bearing alloy. The tightening of the bearing bush under the working state of the motor is a relatively important installation process.

[0003] The anti-loosening fasteners used on the bearing shells of railway locomotive motors in my country are now mainly imported from foreign technology. Usually, a special glue is applied to the threaded part before installation and tightening. This glue must be imported from the United States or Japan, with high cost and limited use and storage. Secondly, the installation operation is cumbersome. The workpiece must be thoroughly cleaned and dried before gluing, and it cannot be put into use immediately after construction. It must wait until the glue is thoroughly solidified before it can withstand the vibration force during work. When the motor fails to repair, the fasteners have to be loosened and retightened, and the screws coated with glue are difficult to loosen with a wrench, and the residual glue is extremely difficult to clean. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the embodiments of the present utility model is to provide a fastener for railway motor bearing bushings.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a fastener for a railway motor bearing shell, comprising a bolt, a nut and a gasket. The bolt is a solid structure, a first thread is arranged at one end of the bolt, and a second thread is arranged at the other end of the bolt. The second thread cooperates with the nut. A plurality of special-shaped thorns are arranged on one side of the gasket, and a plurality of circumferentially distributed ratchets are arranged on the other side of the gasket. By tightening the nut, the special-shaped thorns on the gasket are pushed against the surface of the bearing shell, and the rotation direction of the ratchet is consistent with the direction when the nut is tightened.

[0006] As a further improvement, the pitches of the first thread and the second thread are different.

[0007] As a further improvement: the shape of the special-shaped thorn is a cone.

[0008] As a further improvement: the cone angle of the cone is 60°.

[0009] As a further improvement, the ratchet tip angle of the ratchet is 10-20°.

[0010] As a further improvement scheme: a countersunk hole is formed at one end of the bolt close to the second thread.

[0011] As a further improvement scheme: a flange structure is arranged on one side of the nut close to the gasket, the flange structure is provided with a plurality of screw holes, and blocking screws are installed in the screw holes, and the blocking screws pass through the gasket.

[0012] As a further improvement scheme: a connecting piece is installed at one end of the blocking screw located outside the flange structure, and the connecting piece is used to fix a plurality of the blocking screws.

[0013] As a further improvement scheme: a through hole is formed at one end of the blocking screw located outside the flange structure, the through hole passes through the blocking screw, and the connecting piece is a metal wire.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: by providing a solid bolt, a certain strength requirement of the bolt can be provided; by adjusting the single-start thread to a double-start thread, the original hexagonal head is changed into a bolt and nut structure, and the bolt tightening and anti-loosening object is adjusted to the nut, and on this basis, by providing special-shaped thorns and ratchets, the bolt and nut tightening effect can be improved while preventing the nut from loosening due to vibration. In addition, the fastener in the present invention saves the steps of cleaning and drying and waiting for the glue to solidify thoroughly, and the fastener is easy to install and disassemble with low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of a fastener for a railway motor bearing bush;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of a fastener for a railway motor bearing bush;

[0017] Figure 3 A schematic diagram of the bolt structure of a fastener for a railway motor bearing bush;

[0018] Figure 4 A schematic diagram of the structure of a cone-thorn pad of a fastener for a railway motor bearing bush;

[0019] Figure 5 A side view of a conical thorn pad of a fastener for a railway motor bearing bush;

[0020] Figure 6 It is a schematic diagram of the cross-sectional structure of a cone-thorn pad of a fastener for a railway motor bearing bush;

[0021] Figure 7 It is a schematic diagram of the distribution structure of the cone thorn pad of a fastener for a railway motor bearing bush;

[0022] Figure 8 A schematic diagram of the bolt structure of a fastener for a railway motor bearing bushing Figure 1 ;

[0023] Fig. 9 A schematic diagram of the bolt structure of a fastener for a railway motor bearing bushing Figure 2 ;

[0024] Fig.10 A schematic diagram of a nut structure of a fastener for a railway motor bearing bush;

[0025] Fig.11 A schematic diagram of the cross-sectional structure of a nut of a fastener for a railway motor bearing bush;

[0026] In the figure: 1, nut; 11, screw hole; 2, bolt-blocking screw; 3, gasket; 31, ratchet; 32, special-shaped thorn; 4, bolt; 41, first thread; 42, second thread; 43, countersunk hole; 6, connecting piece; 7, bearing shell; 8, machine body; 9, through hole. DETAILED DESCRIPTION

[0027] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0028] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0029] See also Figures 1 to 7 In one embodiment, a fastener for a railway motor bearing shell includes a bolt 4, a nut 1, and a gasket 3. The bolt 4 is a solid structure. A first thread 41 is provided at one end of the bolt 4, and a second thread 42 is provided at the other end of the bolt 4. The second thread 42 cooperates with the nut 1. A plurality of special-shaped thorns 32 are provided on one side of the gasket 3, and a plurality of circumferentially distributed ratchet teeth 31 are provided on the other side of the gasket 3. By tightening the nut 1, the special-shaped thorns 32 on the gasket 3 are pushed against the surface of the bearing shell 7, and the rotation direction of the ratchet teeth 31 is consistent with the direction when the nut 1 is tightened.

[0030] In this embodiment, the bolt 4 has a coarse thread M36, and the nut 1M2 has a fine thread M39X2. In the prior art, the anti-loosening technology of the bolt 4 is mostly center drilling, such as self-retracting type, expansion type, tensioning type, etc., while the utility model adopts a solid structure of the bolt 4, so that the strength of the bolt 4 is not affected.

[0031] When tightening, first screw the bolt 4 into the body 8 and the bearing shell 7, that is, the first thread 41 penetrates into the bearing shell 7 and the body 8, and the second thread 42 is located outside the bearing shell 7. The diameter of the end of the bolt 4 corresponding to the first thread 41 is different from the diameter of the end corresponding to the second thread 42, so that the force of the nut 1 is better than that of the original single-head bolt. The diameter of the bolt 4 at the second thread 42 is larger than the diameter of the bolt 4 at the first thread 41. When the bolt 4 is tightened, the bolt 4 at the second thread 42 just contacts the surface of the bearing shell 7. At this time, The gasket 3 is sleeved on the bolt 4, and the side with the special-shaped thorns 32 is made to be close to the bearing shell 7, then the nut 1 is matched with the second thread 42, and the nut 1 is tightened so that the nut 1 squeezes the gasket 3, and the axial pressure causes the special-shaped thorns 32 to be pressed into the outer surface of the bearing shell 7, so that the gasket 3 is firmly connected to the surface of the bearing shell 7, and the upper surface of the special-shaped thorns 32 is a ratchet 31 structure, and the ratchet 31 is directional. When the nut 1 is tightened by right-hand rotation, the end face of the nut 1 gently passes over the back of the ratchet 31, and when the nut 1 is loosened by left-hand rotation, the tip of the ratchet 31 presses against the end face of the nut 1 to prevent the nut 1 from loosening.

[0032] By providing a solid bolt 4, a certain strength can be provided to the bolt 4; by adjusting the single-start thread to a double-start thread, changing the original hexagonal head to a bolt-nut structure, the bolt 4 is adjusted to the nut 1 to prevent loosening. On this basis, by providing special-shaped thorns 32 and ratchet teeth 31, the tightening effect can be improved while preventing the nut 1 from loosening due to vibration. In addition, the fastener in the utility model saves the steps of cleaning and drying and waiting for the glue to solidify thoroughly, and the fastener is easy to install and disassemble with low cost.

[0033] See also Figure 2 , Figure 3 In one embodiment, the pitch of the first thread 41 is different from that of the second thread 42 .

[0034] In this embodiment, since the pitches of the first thread 41 and the second thread 42 are different, if the nut 1 is not loose, the bolt 4 will not be loose, ensuring that the nut 1 and the bolt 4 can only move synchronously after installation. Based on this principle, the anti-loosening function of the entire anti-loosening fastener becomes only anti-loosening of the nut 1.

[0035] See also Figures 4 to 7 In one embodiment, the special-shaped thorn 32 is in the shape of a cone.

[0036] In this embodiment, the special-shaped thorn 32 may also be in the shape of a regular triangular prism.

[0037] See also Figures 4 to 7 In one embodiment, the cone angle of the cone is 60°.

[0038] In this embodiment, the cone angle is designed to be 60°, which has good stress resistance and is easy to demould during stamping. The special-shaped thorns 32 are arranged in a regular triangle on the pad surface, covering the entire pad surface. The spacing between the special-shaped thorns 32 is 4mm, the bottom diameter of the cone is 3mm, and the thorn height is about 2.5mm. The special-shaped thorns 32 are important load-bearing parts and need to be quenched and tempered, HRc40~45.

[0039] See also Figures 4 to 7 In one embodiment, the ratchet angle of the ratchet tooth 31 is 10 to 20 degrees.

[0040] In this embodiment, the number of ratchet teeth 31 is 32 and they are distributed in the circumferential direction, and the angle between each two ratchet blades is 11.25°. The ratchet teeth 31 are 2 mm high, and the ratchet tip angle is about 10-20°. The front of the ratchet teeth 31 is steep and perpendicular to the end face, and the back angle is gentle. The rotation direction of the ratchet teeth 31 on the end face of the ratchet teeth 31 is consistent with the direction when the locking nut 1 is tightened, that is, right-handed, that is, when the locking nut 1 is right-handed, the back angle is in front, and the ratchet teeth 31 gently slide over the end face of the thorn pad; conversely, when the locking nut 1 is left-handed, the front of the ratchet blade is in front, and the ratchet tip is against the end face, preventing the locking nut 1 from rotating to the left and loosening.

[0041] See also Figure 3 In one embodiment, a countersunk hole 43 is formed at one end of the bolt 4 close to the second thread 42 .

[0042] In this embodiment, one end of the bolt 4 has a hexagonal hole with a depth of 15 mm. The provision of the hexagonal countersunk hole 43 makes it easy to screw the bolt 4 into the machine body 8 using a hexagonal wrench.

[0043] See also Figures 8 to 11 In one embodiment, a flange structure is provided on one side of the nut 1 close to the gasket 3 , and a plurality of screw holes 11 are opened in the flange structure. Bolt-blocking screws 2 are installed in the screw holes 11 , and the bolt-blocking screws 2 pass through the gasket 3 .

[0044] In this embodiment, the nut 1 can increase the contact area of ​​the bottom of the nut 1 by setting a flange structure, and the area of ​​the conical thorn pad is increased to accommodate more conical thorns so that more conical thorns can be involved in the work, which can further improve the fastening effect and also facilitate the installation of the bolt-blocking screw 2.

[0045] The bolting screws 2 are evenly distributed on the flange of the nut 1, and the front cone angle is 90°. After the nut 1 is tightened, a pistol drill (the drill bit diameter is slightly smaller than the inner diameter of the screw hole) is used to insert the drill bit into the screw hole 11 and drill a small pit on the cone thorn pad. The cone angle and depth of the pit are consistent with those of the bolting screw 2.

[0046] See also Figure 8 , Fig. 9 In one embodiment, a connecting piece 6 is installed on the outer side of the flange structure of the blocking screw 2 , and the connecting piece 6 is used to fix a plurality of the blocking screws 2 .

[0047] In this embodiment, the connecting member 6 may be an end cover, and the end cover is provided with countersunk holes adapted to the plurality of the blocking screws 2 .

[0048] See also Figure 1 , Fig. 9 In one embodiment, a through hole 9 is formed at one end of the blocking screw 2 located outside the flange structure, and the through hole 9 passes through the blocking screw 2. The connecting member 6 is a metal wire.

[0049] When all the bolting screws 2 are screwed into the screw holes 11 and their heads are inserted into the drilled holes and close to each other, a metal wire is passed through the through hole 9, and finally the metal wire is tightened to connect the several bolting screws 2 together. By connecting several bolting screws 2, the nut 1 and the washer 3 can be firmly connected. The metal wire can be iron wire.

[0050] Working process in the embodiment of the utility model:

[0051] When tightening, first screw the bolt 4 into the body 8 and the bearing shell 7, that is, the first thread 41 penetrates into the bearing shell 7 and the body 8, and the bolt 4 at the second thread 42 just touches the surface of the bearing shell 7. At this time, put the gasket 3 on the bolt 4, and make the side with the special-shaped thorns 32 close to the bearing shell 7, then match the nut 1 with the second thread 42, tighten the nut 1, so that the nut 1 squeezes the gasket 3, and the axial pressure makes the special-shaped thorns 32 pressed into the outer surface of the bearing shell 7, so that the gasket 3 is firmly connected to the surface of the bearing shell 7. When the nut 1 is tightened, use a pistol drill to let the drill bit extend from the screw hole 11 and drill a small pit on the cone thorn pad. The cone angle and depth of the pit are consistent with the head of the bolting screw 2. After all the bolting screws 2 are screwed into the screw hole 11 and the heads enter the drill pit and are close, use a metal wire to pass through the through hole 9, and finally tighten the wire to connect the three bolting screws 2 together.

[0052] When working, the teeth of the ratchet 31 are facing the loosening direction of the nut 1. During normal operation, the vibration of the nut 1 may cause the nut 1 to rotate in the opposite direction and loosen, and the reverse rotation and loosening will be blocked by the teeth. When performing maintenance and disassembly, use a wrench to forcibly turn the nut 1 in the left direction to rotate the nut 1 in the loosening direction. When the torque is too large, the ratchet 31 will have a slight elastic deformation, so the nut 1 will retreat slightly. Continue to apply force, the deformation will be greater and the retreat will be greater. In this way, the nut 1 will be loosened. This process is called "unlocking", which is artificially twisted with a wrench. When the device is working normally, it will not generate huge torque just by vibration, so it will not be naturally "unlocked" by vibration. This is because the resistance of the tip of the ratchet 31 requires much more force to loosen the nut 1 than to unscrew the general nut 1.

[0053] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0054] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A fastener for a railway motor bearing bush, comprising a bolt, characterized in that: It also includes a nut and a gasket. The bolt is a solid structure. A first thread is provided at one end of the bolt and a second thread is provided at the other end of the bolt. The second thread cooperates with the nut. A plurality of special-shaped thorns are provided on one side of the gasket, and a plurality of circumferentially distributed ratchets are provided on the other side of the gasket. By tightening the nut, the special-shaped thorns on the gasket are pushed against the surface of the bearing shell, and the rotation direction of the ratchets is consistent with the direction when the nut is tightened.

2. A railway motor bearing bushing fastener according to claim 1, characterized in that: The first thread and the second thread have different pitches.

3. The railway motor bearing bushing fastener according to claim 1, characterized in that: The special-shaped thorn is in the shape of a cone.

4. A railway motor bearing bushing fastener according to claim 3, characterized in that: The cone angle of the cone is 60°.

5. The railway motor bearing fastener according to claim 1, characterized in that: The ratchet tip angle of the ratchet is 10-20 degrees.

6. The railway motor bearing bushing fastener according to claim 1, characterized in that: A countersunk hole is formed at one end of the bolt close to the second thread.

7. A railway motor bearing fastener according to any one of claims 1 to 6, characterized in that: A flange structure is arranged on one side of the nut close to the gasket. The flange structure is provided with a plurality of screw holes. Bolt-blocking screws are installed in the screw holes. The bolt-blocking screws penetrate the gasket.

8. A railway motor bearing bushing fastener according to claim 7, characterized in that: A connecting piece is installed at one end of the blocking screw located outside the flange structure, and the connecting piece is used to fix a plurality of the blocking screws.

9. A railway motor bearing bushing fastener according to claim 8, characterized in that: A through hole is formed at one end of the blocking screw located outside the flange structure, and the through hole passes through the blocking screw. The connecting piece is a metal wire.

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