CN108909749B - Anti-side-rolling torsion bar end structure for preventing galvanic corrosion - Google Patents
Anti-side-rolling torsion bar end structure for preventing galvanic corrosion Download PDFInfo
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- CN108909749B CN108909749B CN201810799667.0A CN201810799667A CN108909749B CN 108909749 B CN108909749 B CN 108909749B CN 201810799667 A CN201810799667 A CN 201810799667A CN 108909749 B CN108909749 B CN 108909749B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
- B61F5/38—Arrangements or devices for adjusting or allowing self- adjustment of wheel axles or bogies when rounding curves, e.g. sliding axles, swinging axles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
- B61F5/50—Other details
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Abstract
The invention discloses a side-rolling-resistant torsion bar end part structure for preventing galvanic corrosion, which comprises a coating sprayed on the peripheral surface of the end part of a torsion bar, wherein the coating is positioned between the end part of the torsion bar and a torsion bar bearing after assembly, and a main sealing ring arranged between the end surface of the torsion bar and the end surface of the torsion bar bearing. The invention can prevent the end part of the torsion bar from rusting in the using process, reduce the rejection rate of the anti-side rolling torsion bar device, reduce the maintenance cost, and can bypass the restriction of foreign technologies and master the maintenance market autonomously.
Description
Technical Field
The invention relates to an end part structure of an anti-side-rolling torsion bar, in particular to an end part structure of an anti-side-rolling torsion bar for preventing galvanic corrosion.
Background
When the rail vehicle passes through a curve and a turnout at a high speed or is statically parked on a curve with a super high height, the side rolling is obviously increased, the load of a side wheel is reduced, and even the overturning instability condition occurs when strong transverse wind occurs, so that the safety is reduced. The roll stiffness of the vehicle needs to be increased to limit its roll angle, but not to affect the heave, yaw, roll, stretch, and yaw oscillation characteristics of the vehicle.
The anti-rolling torsion bar forming device is arranged on a rail transit vehicle, when the rail transit vehicle does rolling movement, the torsion bar shaft is twisted and deformed, and provides rolling rigidity required by the safe operation of the vehicle together with other components, so that the requirements of the dynamic performance of the vehicle are met, and the safe operation of the vehicle is ensured. The vibration of the vehicle mainly has six degrees of freedom: stretching vibration in the X direction, yawing vibration in the Y direction, floating and sinking vibration in the Z direction, nodding vibration around the Y axis, shaking vibration around the Z axis, and rolling vibration around the X axis. The anti-rolling torsion bar component device mainly plays a role in adjusting the rolling rigidity of the vehicle and controlling the rolling vibration of the vehicle.
The anti-rolling torsion bar device mainly comprises a torsion bar, a torsion arm, a bearing seat assembly and a vertical connecting rod assembly. As shown in fig. 1 and 2, a torsion bar bearing 2 is provided inside the bearing housing assembly 1 by interference fit, a torsion bar end 312 extending in the axial direction is provided on a torsion bar end surface 311 of the torsion bar 3, the diameter of the torsion bar end 312 is smaller than that of the torsion bar 3 at the torsion bar end surface 311, and a spline 4 is provided on the outer peripheral surface of the torsion bar 3 near the torsion bar end surface 311. During assembly, the torsion bar end 312 is inserted into the torsion bar bearing 2 and is in clearance fit with the torsion bar bearing 2, and the torsion arm 5 is sleeved on the outer circumferential surface of the torsion bar 3 close to the torsion bar end surface 311 through spline fit.
At present, when the anti-side-rolling torsion bar device of some railway vehicles is overhauled, the end part of the torsion bar is rusted, and a plurality of anti-side-rolling torsion bar devices exceed the overhauling standard. The high rejection rate of the anti-rolling torsion bar device leads to high maintenance cost of the product, and the anti-rolling torsion bar device on some rail vehicles is developed in a home-made way on the basis of foreign products at present, most of the structure of the anti-rolling torsion bar device is still the foreign prototype structure, the improvement difficulty is high, in addition, in recent years, the anti-rolling torsion bar device on some rail vehicles has about 1 billion yuan per year of production value and large scale of production value, particularly, the product reaches the maintenance period in succession, and the scale of the maintenance market is considerable, so the solution of the problem is urgent and important.
The following patent documents were searched:
the utility model discloses an anti-rolling torsion bar, including torsion bar, bearing, torque arm, connecting rod seat and joint bearing, be provided with sealing member between the circular bead of torque arm and the terminal surface of bearing, sealing member is the seal cover, and the seal cover comprises rubber.
The Chinese utility model patent with the authorization notice number of CN203111196U and the authorization notice date of 2013, 8 and 7 discloses a novel anti-rolling torsion bar device for a railway vehicle, which mainly comprises a torsion bar shaft, a torsion arm, a vertical connecting rod, a rubber joint bearing I, a rubber joint bearing II and a metal joint bearing; one end of the torsion arm is connected with the torsion bar shaft in a connecting mode of enveloping equidistant polygonal profiles, the other end of the torsion arm is connected with the first rubber joint bearing, and the first rubber joint bearing is connected with a vehicle body; one end of the vertical connecting rod is connected with the outer metal knuckle bearing sleeve, the inner metal knuckle bearing sleeve is connected with the torsion bar shaft, the other end of the vertical connecting rod is connected with the second rubber knuckle bearing, and the second rubber knuckle bearing is connected with a bogie.
Three, the chinese utility model patent that the bulletin number of authorizing is CN203162159U, and the date of authorizing is 2013 8 month 28 days discloses a novel double-deck seal structure that rolling torsion bar was used, including the support seat subassembly that is equipped with the seal groove, be equipped with the torsion arm of seal groove and install lip seal circle between support seat subassembly and the torsion arm, lip seal circle includes main part and interior, outer lip, the main part is fixed in the seal groove of support seat subassembly through the interference nestification, outer lip laminating is at the outer terminal surface of torsion arm, and the laminating of inner lip is in the torsion arm seal groove.
Although the above patent documents are all provided with a seal assembly, the end portion of the torsion bar is corroded during use.
In conclusion, how to design an anti-side rolling torsion bar end structure for preventing galvanic corrosion, which can prevent the end of the torsion bar from rusting in the using process, reduce the rejection rate of the anti-side rolling torsion bar device, reduce the maintenance cost and avoid the restriction of foreign technologies, and the autonomous mastering of the maintenance market is a technical problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides an end part structure of an anti-side-rolling torsion bar for preventing galvanic corrosion, which can prevent the end part of the torsion bar from rusting in the using process, reduce the rejection rate of the anti-side-rolling torsion bar device, reduce the maintenance cost, avoid the restriction of foreign technologies and autonomously master the maintenance market.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the structure comprises a coating sprayed on the outer peripheral surface of the end part of the torsion bar, the coating is positioned between the end part of the torsion bar and a torsion bar bearing after being assembled, and a main sealing ring is arranged between the end surface of the torsion bar and the end surface of the torsion bar bearing.
Preferably, the coating is made of PTFE, FEP, PFA, ETFE, ceramic paint and dry lubricating paint.
Preferably, the insulation resistance of the coating is more than or equal to 1000M omega; the adhesion of the coating is grade 0 according to the test standard of ISO 2409.
Preferably, the main seal ring comprises a hollow truncated cone-shaped ring body, an outward-turning convex ring body arranged at the small end of the truncated cone-shaped ring body and a horizontally-extending ring body arranged at the large end of the truncated cone-shaped ring body;
when the end part of the torsion bar is inserted into the torsion bar bearing, the end surface of the torsion bar bearing is contacted with the outward-turning convex ring body of the main sealing ring, in the process of inserting the end part of the torsion bar, the outward-turning convex ring body of the main sealing ring is stressed to be gradually compressed backwards and is always attached to the end surface of the torsion bar bearing, and finally, the outward-turning convex ring body of the main sealing ring is tightly pressed on the end surface of the torsion bar by the end surface of the torsion bar bearing to form sealing, so that external electrolyte is prevented from entering the interior of the torsion bar.
Preferably, the end face of the torsion bar bearing is arranged to be chamfered; after the end part of the torsion bar is inserted into the torsion bar bearing, the outward-turning convex ring body of the main sealing ring is tightly pressed on the end surface of the torsion bar by utilizing the end surface of the chamfer-shaped torsion bar bearing close to the end part of the torsion bar to form a primary sealing structure, and the horizontal extending ring body of the main sealing ring is tightly pressed on the end surface of the torsion bar by utilizing the end surface of the chamfer-shaped torsion bar bearing far away from the end part of the torsion bar to form a secondary sealing structure, so that external electrolyte can be prevented from entering the interior of the torsion.
Preferably, the thickness of the truncated cone-shaped ring body is gradually increased along the direction from the outward turning convex ring body to the horizontally extending ring body.
Preferably, the everting projecting ring body is provided in the shape of a sphere.
Preferably, a full circle of sealant is coated on the spline fitting end surface between the torsion bar and the torsion arm which is far away from the main sealing ring, so that the spline fitting gap between the torsion bar and the torsion arm is completely covered by the sealant, and external electrolyte is prevented from entering the torsion bar bearing.
Preferably, one end of the horizontally extending ring body of the main seal ring is exposed out of the outer circumferential surface of the torsion bar, and after the assembly is completed, the exposed end of the horizontally extending ring body is shielded on the spline fitting end surface between the torsion bar and the torsion arm, which is located at one side close to the main seal ring.
Preferably, an auxiliary sealing ring is arranged between the bearing seat assembly and the end face of the torsion arm and at the peripheral position of the main sealing ring, and an auxiliary sealing structure is formed between the bearing seat assembly and the end face of the auxiliary sealing ring and the end face of the torsion arm to further prevent external electrolyte from entering the interior of the torsion bar bearing.
The invention has the beneficial effects that: through a large amount of research and analysis, in a torsion bar working system, galvanic corrosion is generated on the end part of the torsion bar and a copper-graphite bearing due to coupling of different materials, and the forming conditions of the galvanic corrosion are that dissimilar materials with potential difference are in direct contact (steel-copper and steel-graphite coupling), a current loop is formed, and electrolyte is present. Therefore, the invention forms the current loop by coating the outer circumference of the end part of the torsion bar, and prevents the end part (steel) of the torsion bar from directly contacting with the steel-copper and steel-graphite coupling in the bearing (copper embedded graphite sleeve) of the torsion bar by the coating, and the main seal ring is arranged between the end surface of the torsion bar and the end surface of the bearing, thereby effectively preventing the electrolyte such as water, air and the like outside the train from extruding into the bearing when the train runs at high speed, preventing the occurrence of galvanic corrosion from three aspects of direct contact of heterogeneous materials with potential difference, forming the current loop, existence of the electrolyte and the like, reducing the rejection rate of the anti-side-rolling torsion bar device, reducing the maintenance cost, and being capable of bypassing the restriction of foreign technology and autonomously mastering the maintenance market. The outward-turning convex ring body of the main sealing ring is tightly pressed on the end face of the torsion bar by utilizing the end face of the chamfer-shaped torsion bar bearing close to the end part of the torsion bar to form a primary sealing structure, and the horizontal extension ring body of the main sealing ring is tightly pressed on the end face of the torsion bar by utilizing the end face of the chamfer-shaped torsion bar bearing far away from the end part of the torsion bar to form a secondary sealing structure, so that external electrolyte can be further prevented from entering the interior of the torsion bar bearing through the primary sealing structure and. A large number of researches and analyses prove that the failure of the sealing performance at the spline matching part between the torsion bar and the torsion arm is also one of the causes of galvanic corrosion, therefore, the sealing glue is used for covering the spline matching gap between the torsion bar and the torsion arm, and the gap between the tooth top part and the tooth root part in the spline is blocked, so that the external electrolyte can be further prevented from entering the interior of the torsion bar bearing. The exposed end of the horizontal extension ring body is shielded on the spline matching end surface between the torsion bar and the torsion arm which are positioned on one side close to the main sealing ring, so that external electrolyte can be further prevented from entering the torsion bar bearing, and galvanic corrosion is avoided.
Drawings
Fig. 1 is a partial axial sectional view of a torsion bar end portion at one side in a conventional anti-roll torsion bar apparatus;
FIG. 2 is a partial axial cross-sectional structural schematic view of a prior art torsion bar at the end of the torsion bar;
FIG. 3 is a graph showing the open circuit potential of the detection material (graphite) as a function of time;
FIG. 4 is a graph showing the open circuit potential of the test materials (copper alloy-intercalated graphite and copper alloy) as a function of time;
FIG. 5 is a graph of the open circuit potential of the test material (steel) as a function of time;
FIG. 6 is a table of corrosion rate measurements for immersion corrosion tests of coupled samples of steel and dissimilar materials;
fig. 7 is a partial schematic axial sectional view of the anti-roll torsion bar apparatus of embodiment 1 of the invention at the end of the torsion bar;
FIG. 8 is an enlarged view of section E of FIG. 7;
fig. 9 is an axial sectional view schematically showing the structure of the main seal ring in embodiment 1 of the present invention;
FIG. 10 is an enlarged view of the portion F in FIG. 9;
FIG. 11 is a schematic view of a partial fitting structure of a cylindrical involute spline;
fig. 12 is a partial schematic axial sectional view of a side roll torsion bar apparatus according to embodiment 2 of the present invention at one side torsion bar end portion;
FIG. 13 is an enlarged view of section I of FIG. 12;
in the figure: 1. the bearing seat comprises a bearing seat assembly, 2 parts of a torsion bar bearing, 211 parts of a torsion bar bearing end face, 3 parts of a torsion bar, 311 parts of a torsion bar end face, 312 parts of a torsion bar end portion, 4 parts of a spline, 5 parts of a torsion arm, 6 parts of a coating, 7 parts of a main sealing ring, 711 parts of a truncated cone-shaped ring body, 712 parts of an outward-turning convex ring body, 713 parts of a horizontal extending ring body, 8 parts of an auxiliary sealing ring and 9 parts of a sealant.
Detailed Description
The technical solution of the present invention is further explained in detail with reference to the accompanying drawings and specific embodiments.
Through a great deal of research and analysis, the applicant finds that the torsion bar bearing adopts a copper embedded graphite sleeve, and the relative position between the torsion bar and the copper-graphite bearing moves and is reduced. The lubricating effect between the two is lithium-based grease and graphite powder on the ground copper-graphite bearing. Air and water can enter the space between the inner spline and the outer spline through the gap between the inner spline and the outer spline, and the fluid pressure of the wind driven train running at high speed can extrude more water and air into the end area of the torsion bar, so that the torsion bar and the copper-graphite bearing can be contacted with aqueous solution and oxygen, which provides conditions for corrosion. The corrosion of any metal in an aqueous medium is electrochemical corrosion, so that the more water and oxygen, the more severe the corrosion of torsion bars and copper-graphite bearings. Even without contact of dissimilar materials, corrosion occurs and progresses at the rate of corrosion inherent to each material.
Many metals are themselves corrosion resistant, and the environment is only air and water, which does not cause them to corrode severely, such as copper and copper alloys, aluminum and zinc, etc. In practice, however, there are many factors that accelerate the corrosion of the metal, resulting in an increase in the local corrosion rate of the metal. The function of the galvanic couple is one of them. If two materials with different potentials are coupled together, the material with the lower potential in the solution becomes the anode and corrosion is accelerated, and the material with the higher potential becomes the cathode and is protected or only acts as a carrier for the cathode reactant. The potential difference between the two materials is one of the key factors in the magnitude of the corrosion acceleration effect.
The torsion bar is made of steel materials, and temporary or staged coupling of steel-graphite (graphite columns and graphite powder), steel-copper alloy embedded graphite and copper alloy-graphite (graphite columns and graphite powder) can be formed for the working environment of the end part of the torsion bar. According to the conditions of the torsion bar end part, graphite and copper-graphite bearing copper alloy material being 0.1N NaCl +0.1N NaHSO3The detection results of the open circuit potential in the simulated atmospheric corrosion solution (see fig. 3 to 5, wherein a represents graphite, B represents copper alloy inlaid graphite, C represents copper alloy, and D represents steel) and the galvanic current and the corrosion rate of the steel (see fig. 6) when galvanic couple is formed between the open circuit potential and the copper alloy inlaid graphite, the galvanic current and the corrosion rate of the steel are the largest, and the result is the main reason of the relatively serious local overlooking of the end part of the torsion bar. In summary, in the torsion bar operating system, the coupling of different materials causes galvanic corrosion on the end part of the torsion bar and the copper-graphite bearing, so that the corrosion is accelerated to different degrees. The contact of the torsion bar end with graphite is the main cause of its more severe localized corrosion. The copper-graphite bearing copper alloy also has a certain effect on the accelerated corrosion of the end part of the torsion bar. The applicant believes that galvanic corrosion is formed under conditions in which dissimilar materials present a potential difference come into direct contact (steel-copper, steel-graphite coupling), form a current loop, and have an electrolyte. Therefore, research should be conducted from these three aspects.
Example 1: as shown in fig. 7 and 8, the anti-roll torsion bar end structure for preventing galvanic corrosion includes a coating 6 coated on the outer circumferential surface of the torsion bar end 312, the coating 6 is located between the torsion bar end 312 and the torsion bar bearing 2 after assembly, the coating 6 is used to prevent dissimilar materials from directly contacting and forming a current loop, and a main seal 7 is disposed between the torsion bar end 311 and the torsion bar bearing end 211 of the torsion bar, the main seal 7 is pressed and attached to the torsion bar end 311 of the torsion bar by the torsion bar bearing end 211, so that a sealed attachment surface is formed on the torsion bar bearing end 211 to prevent external electrolyte from entering the torsion bar bearing, thereby preventing galvanic corrosion. In the embodiment, the coating is coated on the outer peripheral surface of the end part of the torsion bar, the coating is used for preventing the end part (steel) of the torsion bar from being directly contacted with steel-copper and steel-graphite coupling in a torsion bar bearing (a copper-embedded graphite sleeve) to form a current loop, and the main sealing ring is arranged between the end surface of the torsion bar and the end surface of the torsion bar bearing, so that the electrolyte such as water, air and the like outside when a train runs at a high speed is effectively prevented from being extruded into the torsion bar bearing, thereby preventing the occurrence of galvanic corrosion from three aspects of direct contact of heterogeneous materials with potential difference, forming the current loop, existence of the electrolyte and the like, reducing the rejection rate of the anti-side-rolling torsion bar device, reducing the maintenance cost, bypassing the restriction of foreign technology and autonomously mastering the.
The steps of spraying the coating are as follows: 1) carrying out surface treatment on the torsion bar; 2) heating the treated torsion bar; 3) spraying the coating on the end part of the torsion bar; 4) sintering the sprayed coating; 5) cooling after sintering; 6) and grinding and forming the torsion bar with the coating by using grinding equipment. Through the spraying steps, various performances of the coating after the coating is sprayed to the end part of the torsion bar can be better ensured.
The torsion bar surface treatment comprises the following steps:
s1, carrying out neutral degreasing on the torsion bar at the temperature of 60-80 ℃;
s2, cleaning with cold water, cleaning with hot water (60-70 ℃), and finally cleaning with cold water again;
s3, drying the cleaned torsion bar;
and S4, carrying out sand blasting treatment on the dried torsion bar.
Through the steps, the spraying operation of the subsequent coating can be more facilitated.
In this embodiment, PTFE, FEP, PFA, ETFE, ceramic paint, dry lubricant paint, and the like can be used as the coating layer. The insulation resistance of the coating is more than or equal to 1000M omega; according to the detection standard of ISO2409, the adhesion of the coating is 0 grade, and after 334 ten thousand fatigue tests (1/3 of torsion bar fatigue) on the aspect of wear resistance, the coating does not fall off and has no obvious damage or scratch.
As shown in fig. 8, 9 and 10, the main seal ring 7 includes a hollow truncated cone-shaped ring body 711, an outward-turning projecting ring body 712 provided on the small-end portion of the truncated cone-shaped ring body 711, and a horizontally-extending ring body 713 provided on the large-end portion of the truncated cone-shaped ring body 711; when the torsion bar end 312 is inserted into the torsion bar bearing 2, the end face 211 of the torsion bar bearing is in contact with the outward-turning convex ring body 712 of the main seal ring, and in the process of inserting the torsion bar end 312, the outward-turning convex ring body 712 of the main seal ring is stressed to be gradually compressed backwards and always attached to the end face 211 of the torsion bar bearing, and finally, the end face 211 of the torsion bar bearing is used for pressing the outward-turning convex ring body 612 of the main seal ring on the end face 311 of the torsion bar to form sealing, so that external electrolyte is prevented from entering the interior of the torsion bar bearing.
Further, as shown in fig. 8, the torsion bar bearing end face 211 may be set to be chamfered; after the torsion bar end 312 is inserted into the torsion bar bearing 2, the outward-turned convex ring body 712 of the main seal ring is pressed against the torsion bar end surface 311 by the chamfered torsion bar bearing end surface 211 close to the torsion bar end to form a primary seal structure, and the horizontally-extending ring body 713 of the main seal ring is pressed against the torsion bar end surface 311 by the chamfered torsion bar bearing end surface 211 far away from the torsion bar end to form a secondary seal structure, so that the primary seal structure and the secondary seal structure can further prevent external electrolyte from entering the torsion bar bearing.
As shown in fig. 10, the thickness of the truncated cone-shaped ring body 711 is gradually increased in a direction from the outward-turned protruding ring body 712 to the horizontally extending ring body 713. By the arrangement, the sealing performance of the main sealing ring can be better after the assembly is completed.
The outward projecting ring body 712 is formed in a spherical shape so that the outward projecting ring body is fitted more tightly between the torsion bar bearing end face and the torsion bar end face after assembly.
As shown in fig. 8, a secondary seal ring 8 is disposed between the bearing seat assembly 1 and the end surface of the torsion arm 5 and at the peripheral position of the primary seal ring 6, and an auxiliary seal structure is formed between the bearing seat assembly 1, the secondary seal ring 8 and the end surface of the torsion arm 5 to further prevent external electrolyte from entering the torsion bar bearing. In this embodiment, the primary seal ring may be made of nitrile rubber, and the secondary seal ring may be made of polyurethane.
Example 2: the applicant further investigated the possibility of failure of the sealing performance at the spline fit between the torsion bar and the torsion arm by various tests and analysis of the sealing performance of the spline.
A non-pressure water spray test: a set of new anti-rolling torsion bar products are randomly extracted, water is sprayed along the spline grooves in the area on one side of the spline fit (water flow is about 2-3L/min), obvious water seepage can be seen in the area on the other side after 2-3 seconds, and the conclusion that the left end and the right end of the product spline are not sealed can be obtained.
Pressure water spray test: two new sets of products of the anti-rolling torsion bar are randomly extracted, the end part area of the torsion bar is protected by using the bubble bag, water is sprayed along the spline groove in the area on one side of spline matching (the water flow is about 8-10L/min), and the bubble bag is detached to find that the spline areas of the two sets of products have water marks.
Product dissection test:
a set of overhauled anti-side-rolling torsion bar products is selected, the torsion arm at one end is milled, obvious dust and oil stains are deposited in a spline matching area, and the surface condition is good after the dust and the oil stains are tried to be removed. The brown substances between the inner spline and the outer spline of the overhaul product are subjected to component identification, and the analysis result shows that the brown substances mainly comprise: grease, iron element and copper element. After the product runs for a period of time, the copper bush bearing is slightly worn, and the grease mixed with copper element infiltrates between the internal spline and the external spline.
Torsion bar spline coupling analysis:
as shown in fig. 11 (taken from GB/T3478 "straight cylindrical involute spline"), the involute spline is generally tooth side centering (reference circle centering) when used in heavy duty coupling, the tooth side contacts to transfer load, the tooth crest and tooth root are both clearance fit, the large and small diameters of the internal and external splines in the torsion bar are compared, and the clearance between the tooth crest G and the tooth root H is about 0.6 mm.
From the above tests and analysis, the applicant believes that failure of the sealing performance at the spline fit between the torsion bar and the torsion arm is also one of the causes of galvanic corrosion.
Therefore, the applicant has made further improvements: as shown in fig. 12, the present embodiment is different from embodiment 1 in that: and a whole circle of sealant 9 is coated on the matching end surface of the spline 4 between the torsion bar 3 and the torsion arm 5 which is positioned at one side far away from the main sealing ring 7, so that the matching gap of the spline 4 between the torsion bar 3 and the torsion arm 5 is completely covered by the sealant 9, and external electrolyte is prevented from entering the torsion bar bearing. In the embodiment, the spline fit gap between the torsion bar 3 and the torsion arm 5 can be covered by the sealant, and the gap between the tooth top G and the tooth bottom H in the spline is blocked, so that the external electrolyte can be further prevented from entering the interior of the torsion bar bearing.
The step of smearing the sealant comprises the following steps:
a. cleaning a gluing area: inspecting a gluing area of the torsion bar assembly, cleaning foreign matters such as dust, oil stains and paint particles, and paying attention to avoid damaging paint;
b. and (3) sealant inspection: checking the color of the sealant, and the like;
c. coating sealant on the gluing area: the glue nozzle is abutted against the right-angle area, glue is slowly applied manually at a constant speed, the torsion bar assembly is rotated at a constant speed, and the enough and relatively uniform glue amount is ensured after coating;
d. leveling the applied sealant: propping the gluing area by fingers, leveling the glued area, leveling the adhesive layer by using the fingers stained with soap water, ensuring that the straight tooth area is completely covered with the adhesive and the components are uniformly coated in the circumferential direction, ensuring that the adhesive layer has no phenomena of sagging, missing, shrinkage cavity and the like, and cleaning residual sealant;
e. curing the sealant: and standing and curing the glued torsion bar assembly for more than 24 hours to perform primary curing, and then using heating equipment to perform subsequent curing.
Through the steps, the sealing performance of the sealant can be further ensured.
As shown in fig. 13, one end of the horizontally extending ring body 713 of the main seal ring 7 is exposed to the outer circumferential surface of the torsion bar 3, and after the assembly is completed, the exposed end of the horizontally extending ring body 713 is shielded on the mating end surface of the spline 4 between the torsion bar 3 and the torsion arm 5 on the side close to the main seal ring 6. Therefore, external electrolyte can be further prevented from entering the interior of the torsion bar bearing, and galvanic corrosion is avoided.
In conclusion, through a great deal of research and analysis, in a torsion bar working system, the coupling of different materials causes galvanic corrosion on the end part of the torsion bar and a copper-graphite bearing, and the galvanic corrosion is formed under the conditions that dissimilar materials with potential difference are in direct contact (steel-copper and steel-graphite coupling), a current loop is formed and electrolyte exists. Therefore, the invention forms the current loop by coating the outer circumference of the end part of the torsion bar, and prevents the end part (steel) of the torsion bar from directly contacting with the steel-copper and steel-graphite coupling in the bearing (copper embedded graphite sleeve) of the torsion bar by the coating, and the main seal ring is arranged between the end surface of the torsion bar and the end surface of the bearing, thereby effectively preventing the electrolyte such as water, air and the like outside the train from extruding into the bearing when the train runs at high speed, preventing the occurrence of galvanic corrosion from three aspects of direct contact of heterogeneous materials with potential difference, forming the current loop, existence of the electrolyte and the like, reducing the rejection rate of the anti-side-rolling torsion bar device, reducing the maintenance cost, and being capable of bypassing the restriction of foreign technology and autonomously mastering the maintenance market. The outward-turning convex ring body of the main sealing ring is tightly pressed on the end face of the torsion bar by utilizing the end face of the chamfer-shaped torsion bar bearing close to the end part of the torsion bar to form a primary sealing structure, and the horizontal extension ring body of the main sealing ring is tightly pressed on the end face of the torsion bar by utilizing the end face of the chamfer-shaped torsion bar bearing far away from the end part of the torsion bar to form a secondary sealing structure, so that external electrolyte can be further prevented from entering the interior of the torsion bar bearing through the primary sealing structure and. A large number of researches and analyses prove that the failure of the sealing performance at the spline matching part between the torsion bar and the torsion arm is also one of the causes of galvanic corrosion, therefore, the sealing glue is used for covering the spline matching gap between the torsion bar and the torsion arm, and the gap between the tooth top part and the tooth root part in the spline is blocked, so that the external electrolyte can be further prevented from entering the interior of the torsion bar bearing. The exposed end of the horizontal extension ring body is shielded on the spline matching end surface between the torsion bar and the torsion arm which are positioned on one side close to the main sealing ring, so that external electrolyte can be further prevented from entering the torsion bar bearing, and galvanic corrosion is avoided.
The term "plurality" as used in this embodiment means a number of "two or more". The above embodiments are provided for illustrative purposes only and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should fall within the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (7)
1. An anti-rolling torsion bar end structure for preventing galvanic corrosion, characterized in that: the main sealing ring is tightly pressed and attached to the end face of the torsion bar by using the end face of the torsion bar bearing, so that a sealed attaching surface is formed on the end face of the torsion bar bearing, and the occurrence of galvanic corrosion is prevented;
the main sealing ring comprises a hollow truncated cone-shaped ring body, an outward-turning convex ring body arranged on the small end part of the truncated cone-shaped ring body and a horizontally-extending ring body arranged on the large end part of the truncated cone-shaped ring body;
when the end part of the torsion bar is inserted into the torsion bar bearing, the end surface of the torsion bar bearing is contacted with the outward-turning convex ring body of the main sealing ring, in the process of inserting the end part of the torsion bar, the outward-turning convex ring body of the main sealing ring is stressed to be gradually compressed backwards and is always attached to the end surface of the torsion bar bearing, and finally, the outward-turning convex ring body of the main sealing ring is tightly pressed on the end surface of the torsion bar by the end surface of the torsion bar bearing to form sealing, so that external electrolyte is prevented from entering the interior of the torsion bar.
2. The torsion bar end structure for preventing galvanic corrosion according to claim 1, wherein: setting the end face of the torsion bar bearing to be in an inverted angle shape; after the end part of the torsion bar is inserted into the torsion bar bearing, the outward-turning convex ring body of the main sealing ring is tightly pressed on the end surface of the torsion bar by utilizing the end surface of the chamfer-shaped torsion bar bearing close to the end part of the torsion bar to form a primary sealing structure, and the horizontal extending ring body of the main sealing ring is tightly pressed on the end surface of the torsion bar by utilizing the end surface of the chamfer-shaped torsion bar bearing far away from the end part of the torsion bar to form a secondary sealing structure, so that external electrolyte can be prevented from entering the interior of the torsion.
3. The torsion bar end structure for preventing galvanic corrosion according to claim 2, wherein: the thickness of the truncated cone-shaped ring body is gradually increased along the direction from the outward turning convex ring body to the horizontally extending ring body.
4. The torsion bar end structure for preventing galvanic corrosion according to claim 2, wherein: the everting projecting ring body is provided in a spherical shape.
5. The torsion bar end structure for preventing galvanic corrosion according to any one of claims 1 to 4, wherein: and a whole circle of sealant is coated on the spline matching end face between the torsion bar far away from the main sealing ring and the torsion arm, so that the spline matching gap between the torsion bar and the torsion arm is completely covered by the sealant, and external electrolyte is prevented from entering the torsion bar bearing.
6. The torsion bar end structure for preventing galvanic corrosion according to claim 5, wherein: and one end of the horizontal extension ring body of the main sealing ring is exposed out of the outer peripheral surface of the torsion bar, and after the assembly is finished, the exposed end of the horizontal extension ring body is shielded on the spline matching end surface between the torsion bar and the torsion arm, which is positioned at one side close to the main sealing ring.
7. The torsion bar end structure for preventing galvanic corrosion according to claim 6, wherein: and an auxiliary sealing ring is arranged between the bearing seat assembly and the end face of the torsion arm and at the peripheral position of the main sealing ring, and an auxiliary sealing structure is formed between the bearing seat assembly and the end face of the auxiliary sealing ring and the end face of the torsion arm to further prevent external electrolyte from entering the interior of the torsion bar bearing.
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| CN110254459B (en) * | 2019-06-20 | 2021-03-12 | 株洲时代新材料科技股份有限公司 | Method for mounting torsion bar assembly and structure for mounting torsion bar assembly |
| CN115725233A (en) * | 2022-10-21 | 2023-03-03 | 株洲时代新材料科技股份有限公司 | Wear-resistant insulating paint and preparation method and application thereof |
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