A low-wear wheelset and a rail vehicle used on multiple small-radius curve tracks

Abstract

The present invention belongs to the field of road and bridge engineering, and discloses a low-wear wheelset, which can greatly reduce the wear between the track and the wheel rim surface, and greatly reduce the depreciation cost of the rail vehicle wheelset group, including a wheelset group, the wheels including a tread portion, a wheel rim portion, and a coupling bearing connecting the tread portion and the wheel rim portion together, when passing through a curve, the tread portion and the wheel rim surface can rotate independently during the curve passing process, so that the wheel rim surface generates rolling friction rather than sliding friction with the side of the track during the curve passing process. The present invention also provides a rail vehicle applied to a track with multiple small radius curves, and the rail vehicle can greatly extend the service life of the rail vehicle by using the above-mentioned low-wear wheelset.

Description

Technical Field

[0001] The invention belongs to the field of road and bridge engineering, and in particular relates to a low-wear wheelset and a rail vehicle applied to a track with multiple small-radius curves. Background Art

[0002] A single wheel in a wheelset of a rail vehicle is an integrally formed spoke wheel structure, and has an inner rim surface and an outer tread, wherein the outer tread contacts the upper surface of the track, and the rail vehicle travels along the track by rolling on the upper surface of the track. The diameter of the inner rim surface is larger than that of the tread, so that the rim surface can protect the rail vehicle from derailing when the rail vehicle has a large lateral displacement relative to the track.

[0003] When the wheels of existing rail vehicles pass through curves, the edge of the wheel rim surface is not along the guide rail like the tread surface. Therefore, the edge of the wheel rim surface will inevitably make continuous two-point contact and collision with the side of the guide rail during the curve passing process, which will inevitably produce strong sliding friction and wheel-rail interaction force, causing the wheel rim surface to be worn quickly, greatly increasing the depreciation cost of the rail vehicle wheelset and various damages to the rails, and greatly reducing the vehicle's curve passing ability. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a low-wear wheelset and a rail vehicle applied to a track with multiple small-radius curves. The rail vehicle applied to the track with multiple small-radius curves can greatly reduce the wear between the track and the wheel rim surface through the low-wear wheelset, greatly reduce the depreciation cost of the rail vehicle wheelset and various damages to the rails, and improve the curve passing ability of the rail vehicle.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A low-wear wheelset, characterized in that it includes a wheel axle; and a wheelset group, including wheels respectively arranged at both ends of the wheel axle, wherein the wheel includes a tread portion, a rim portion and a coupling bearing connecting the tread portion and the rim portion together.

[0007] Preferably, the present invention also includes an oil stop unit, including an oil deflector ring and an oil deflector bead string. The oil deflector ring is made of magnetic material and is sleeved on the wheel axle. The oil deflector ring has an oil deflector ring body and a matching protrusion located on the oil deflector ring body. The oil deflector bead string is a bead string composed of multiple magnetic beads strung together by an elastic rope. The oil deflector bead string is adsorbed on the matching protrusion. The rim portion has an annular shaft protrusion. The outer surface of the shaft protrusion is rotatably connected to the tread portion through a coupling bearing. The shaft protrusion has an oil storage tank that surrounds the axis of the rim portion and is continuously closed. The opening of the oil storage tank is located on the end face of the rim portion away from the tread portion. An oil supply gap is provided on the inner wall of the oil storage tank. The oil supply gap is connected to the outside through the outer surface of the shaft protrusion. The matching protrusion is inserted and installed in the oil storage tank, and the oil deflector bead string is located in the oil storage tank and blocks the oil supply gap.

[0008] Furthermore, the oil storage tank has a horizontal bottom, the oil supply slot is parallel to the bottom of the oil storage tank, the inner wall of the oil storage tank has a guide slope, the circumference of the oil supply slot is connected to the bottom of the oil storage tank through the guide slope, and the guide slope is inclined toward the outer surface of the shaft protrusion.

[0009] Preferably, the rim height of the rim portion is 28 mm, the rim thickness is 34 mm, the rim angle is 70°, the rim profile is formed by the first arc, the second arc and the third arc being tangent in sequence, the third arc being closer to the tread portion than the second arc, the radius of the first arc is 25 mm, the radius of the second arc is 18 mm, and the radius of the third arc is 15 mm.

[0010] Preferably, the tread portion adopts a wear-type tread structure.

[0011] Preferably, the coupling bearing is any one of a deep groove ball bearing and a cylindrical roller bearing.

[0012] Preferably, there is a uniform separation gap between the tread portion and the rim portion, and the separation gap ranges from 1 mm to 3 mm.

[0013] Preferably, the tread portion is interference fit with the wheel axle, and there is a gap between the rim portion and the wheel axle.

[0014] A rail vehicle used on a track with multiple curves, characterized in that it includes a rail vehicle body; and a low-wear wheelset, which is the low-wear wheelset mentioned above.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Because the wheel of the present invention includes a tread portion, a rim portion and a coupling bearing connecting the tread portion and the rim portion, the tread portion and the rim surface can rotate independently during the curve passing process, so that the rim surface generates rolling friction rather than sliding friction with the side surface of the track during the curve passing process. Therefore, the present invention can greatly reduce the wear between the surface of the track and the rim surface in addition to ensuring the original basic functions of the wheelset group, greatly reduce the depreciation cost of the rail vehicle wheelset group and various types of wear damage to the rail including corrugation, greatly reduce the wheel-rail interaction force, and improve the curve passing performance of the vehicle.

[0017] 2. Because the oil stop unit of the present invention includes an oil deflector ring and an oil deflector bead string, the oil deflector ring has an oil deflector ring body and a matching protrusion, the material of the oil deflector ring is a magnetic material, the oil deflector bead string is a bead string composed of multiple magnetic beads strung together by an elastic rope, the oil deflector bead string is adsorbed on the matching protrusion, the rim portion has a shaft protrusion, the shaft protrusion has an oil storage groove, the inner wall of the oil storage groove has an oil supply gap, the oil supply gap is connected to the outside, the matching protrusion is inserted and installed in the oil storage groove, and the oil deflector bead string is located in the oil storage groove and blocks the oil supply gap. Therefore, when the rotation speed of the rim portion relative to the tread portion exceeds the predetermined rotation speed, the oil deflector bead string will get rid of the adsorption force of the oil deflector ring body and move toward the bottom of the oil storage groove, so that the oil supply gap connects the oil storage groove and the outside, so that the oil storage groove supplies oil to the coupling bearing, greatly extending the service life of the low-wear wheelset.

[0018] 3. Because the rim height of the rim portion of the present invention is 28 mm, the rim thickness is 34 mm, the rim angle is 70°, the rim profile is formed by the first arc, the second arc and the third arc being tangent in sequence, the third arc is closer to the tread portion than the second arc, the radius of the first arc is 25 mm, the radius of the second arc is 18 mm, and the radius of the third arc is 15 mm, therefore, the rim of the rim portion can obtain higher rigidity and strength through the optimization setting of characteristic parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a low-wear wheelset according to an embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of a wheel according to an embodiment of the present invention; and

[0021] Figure 3 for Figure 2 A partial enlarged schematic diagram of part A;

[0022] Figure 4 An exploded view of a bottom wear wheelset according to an embodiment of the present invention; and

[0023] Figure 5 It is a partial cross-sectional schematic diagram of a wheel rim portion according to an embodiment of the present invention.

[0024] In the figure: 100, low-wear wheelset, 10, wheel axle, 20, wheelset group, 20A, separation gap, 21A, wheel, 21, tread portion, B, coupling bearing, 22, wheel rim, 221, shaft protrusion, 221a, retaining ring groove, D, elastic retaining ring, 2211, oil storage tank, 2211a, oil supply gap, 2211b, guide ramp, C1, first arc, C2, second arc, C3, third arc, 30, oil stop unit, 31, oil retaining ring, 311, oil retaining ring body, 312, matching protrusion, 32, oil retaining bead string. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments and the accompanying drawings specifically illustrate the low-wear wheelset of the present invention and the rail vehicle applied to multiple small-radius curve tracks. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0026] like Figure 1 As shown, the low-wear wheelset 100 in this embodiment includes a wheel axle 10 , a wheelset group 20 and an oil stop unit 30 .

[0027] The wheelset set 20 includes wheels 21A respectively disposed at two ends of the wheel axle 10 . In the present embodiment, the wheels 21A are fixed at two ends of the wheel axle 10 via shoulder structures on the wheel axle 10 .

[0028] like Figure 2 As shown, the wheel 21A includes a tread portion 21, a rim portion 22 and a coupling bearing B. The tread portion 21 adopts a wear-type tread structure. The coupling bearing B connects the tread portion 21 and the rim portion 22 together. The coupling bearing is any one of a deep groove ball bearing and a cylindrical roller bearing. In this embodiment, the rim portion 22 has a shaft protrusion 221 protruding toward the tread portion 21. The rim portion 22 is coupled to the tread portion 21 through the coupling bearing B mounted outside the shaft protrusion 221, so that the tread portion 21 and the rim portion 22 can rotate independently. The coupling bearing B is preferably a deep groove ball bearing, whose code is 6080. If the coupling bearing B adopts a cylindrical roller bearing, its code is preferably FC3248124.

[0029] There is a uniform separation gap 20A between the tread portion 21 and the rim portion 22 . The separation gap 20A ranges from 1 mm to 3 mm. In the present embodiment, the separation gap 20A is preferably 1 mm.

[0030] The tread portion 21 is interference fit with the wheel axle 10, and there is a gap between the rim portion 22 and the wheel axle 10, so that the tread portion 21 is driven to rotate by the wheel axle 10, and the rim portion 22 is only driven by the resistance provided by the side of the track surface when passing through a curve, thereby rotating relative to the tread portion 21. At this time, the friction between the rim portion 22 and the side of the track is rolling friction.

[0031] like Figure 3 As shown, the rim height of the rim portion 22 is 28 mm, the rim thickness is 34 mm, the rim angle is 70°, and the rim profile is formed by the first arc C1, the second arc C2 and the third arc C3 being tangent in sequence. The third arc C3 is closer to the tread portion 21 than the second arc. The radius of the first arc is 25 mm, the radius of the second arc is 18 mm, and the radius of the third arc is 15 mm. In this embodiment, the tangent of the edge of the third arc C3 toward the tread portion 21 is equal to the tangent of the corresponding edge of the tread portion 21.

[0032] like Figure 4 and Figure 5 As shown, the rim portion 22 has an annular shaft protrusion 221 , and the outer surface of the shaft protrusion 221 is rotatably connected to the tread portion 21 through a coupling bearing B.

[0033] The shaft protrusion 221 has an oil storage groove 2211 which surrounds the axis of the rim portion 22 and is continuously closed. The opening of the oil storage groove 2211 is located on the end surface of the rim portion 22 away from the tread portion 21. In this embodiment, the oil storage groove 2211 contains lubricating oil. The shaft protrusion 221 is an annular protrusion. There are four oil supply slits 2211a, which are evenly arranged along the circumference of the shaft protrusion 221 and are located at the root of the shaft protrusion 221.

[0034] In this embodiment, the shaft protrusion 221 further has a retaining ring groove 221 a , and the shaft protrusion 221 cooperates with the coupling bearing B via an elastic retaining ring D disposed in the retaining ring groove 221 a , thereby preventing the coupling bearing B from axially moving.

[0035] The inner wall of the oil storage tank 2211 is provided with an oil supply slit 2211 a and a guide slope 2211 b.

[0036] The oil supply slit 2211a is connected to the outside through the outer surface of the shaft protrusion 221, and the oil storage tank 2211 has a horizontal bottom. The oil supply slit 2211a and the bottom of the oil storage tank 2211 are parallel to each other, and the circumference where the oil supply slit 2211a is located is connected to the bottom of the oil storage tank 2211 through a guide slope 2211b, and the guide slope 2211b is inclined toward the outer surface of the shaft protrusion 221. In the present embodiment, the vertical section of the oil storage tank 2211 located between the horizontal plane where the oil supply slit 2211a is located and the plane where the bottom of the oil storage tank 2211 is located is in the shape of a right-angled trapezoid, and the slot width of the oil storage tank 2211 is smaller than the bottom of the oil storage tank 2211.

[0037] The oil stop unit 30 includes an oil deflector ring 31 and an oil deflector bead string 32 .

[0038] The oil deflector 31 is used to seal and cover the oil storage tank 2211. The material is magnetic material and is sleeved on the wheel axle 10. The oil deflector 31 has an oil deflector body 311 and a matching protrusion 312 located on the oil deflector body 311. In this embodiment, the oil deflector body 311 and the matching protrusion 312 are integrally formed.

[0039] The oil deflector ring body 311 is a plate-shaped circular ring parallel to the end surface of the rim portion 22 , and is inserted and installed in the oil storage groove 2211 with the mating protrusion 312 .

[0040] The oil-blocking bead string 32 is a bead string composed of multiple magnetic beads strung together by an elastic rope (not shown in the drawings). The oil-blocking bead string 32 is set on the matching protrusion 312 by magnetic adsorption. The oil-blocking bead string 32 is located in the oil storage groove 2211 and blocks the oil supply gap 2211a.

[0041] When the low-wear wheelset 100 of the present embodiment passes through a curved section of the track during operation, the tread portion 21 and the rim portion 22 generate relative rotation. If the speed of the relative rotation does not reach a predetermined speed, the oil-blocking bead string 32 will always be adsorbed on the mating protrusion 312, so that the oil supply gap 2211a is blocked, and the lubricating oil cannot flow out of the oil storage tank 2211. If the speed of the relative rotation is greater than or equal to the predetermined speed, the oil-blocking bead string 32 will get rid of the adsorption force of the mating protrusion 312 and move toward the bottom of the oil storage tank 2211, so that the oil supply gap 2211a is no longer blocked and connected to the oil storage tank 2211 and the outside, so that the oil storage tank 2211 supplies oil to the coupling bearing B.

[0042] The rail vehicle (not shown in the drawings) of this embodiment, which is applied to a track with multiple small-radius curves, includes a rail vehicle body and a low-wear wheelset 100 .

[0043] When the rail vehicle is used in a rail transit system with multiple small-radius curve tracks, the wear of the track pairs and wheelsets can be significantly reduced during frequent curve passing actions, thereby greatly improving the service life of the rail vehicle. In addition, due to the settings of the oil storage tank 2211 and the oil stop unit 30, the rail vehicle can automatically lubricate and protect the moving parts in the wheelsets in a timely manner during operation, thereby further improving the effect of improving the service life of the rail vehicle.

[0044] The above-mentioned implementation modes are preferred cases of the present invention and are not used to limit the protection scope of the present invention. Various deformations or modifications that can be made by ordinary technicians in this field without creative work within the scope of the attached claims are still within the protection scope of this patent.

Claims

1. A low-wear wheelset, characterized in that: include: Wheel axle; as well as The wheel set comprises wheels respectively arranged at both ends of the wheel axle. The wheel comprises a tread portion, a rim portion and a coupling bearing connecting the tread portion and the rim portion together. The low-wear wheelset also includes an oil stop unit, including an oil stop ring and an oil stop bead string. The oil slinger ring is made of magnetic material and is sleeved on the wheel shaft. The oil slinger ring comprises an oil slinger ring body and a matching protrusion on the oil slinger ring body. The oil-blocking bead string is a bead string formed by a plurality of magnetic beads strung together by an elastic rope, and the oil-blocking bead string is adsorbed and arranged on the matching protrusion. The wheel rim has an annular shaft protrusion, the outer surface of which is rotatably connected to the tread portion via the coupling bearing. The shaft protrusion has an oil storage groove which surrounds the axis of the wheel rim and is continuously closed. The opening of the oil storage groove is located on the end surface of the wheel rim away from the tread portion. The inner wall of the oil storage groove has an oil supply slit which is connected to the outside through the outer surface of the shaft protrusion. The matching protrusion is inserted and installed in the oil storage tank, and the oil blocking bead string is located in the oil storage tank and blocks the oil supply gap. The oil storage tank has a horizontal tank bottom, and the oil supply slot is parallel to the tank bottom of the oil storage tank. The inner wall of the oil storage tank has a guide slope. The circumference of the oil supply slot is connected to the bottom of the oil storage tank through the guide slope, and the guide slope is inclined toward the outer surface of the shaft protrusion. The oil supply slots are evenly arranged along the circumference of the shaft protrusion and are located at the root of the shaft protrusion. The vertical section of the oil storage tank located between the horizontal plane where the oil supply slot is located and the plane where the bottom of the oil storage tank is located is in the shape of a right-angled trapezoid, and the slot width of the oil storage tank is smaller than the bottom of the oil storage tank.

2. The low-wear wheelset according to claim 1, characterized in that: in, The wheel rim portion has a wheel rim height of 28 mm, a wheel rim thickness of 34 mm, a wheel rim angle of 70°, and a wheel rim profile formed by sequentially tangent connection of a first arc, a second arc, and a third arc, wherein the third arc is closer to the tread portion than the second arc. The radius of the first circular arc is 25 mm, the radius of the second circular arc is 18 mm, and the radius of the third circular arc is 15 mm.

3. The low-wear wheelset according to claim 1, characterized in that: in, The tread portion adopts a wear-type tread structure.

4. The low-wear wheelset according to claim 1, characterized in that: in, The coupling bearing is any one of a deep groove ball bearing and a cylindrical roller bearing.

5. The low-wear wheelset according to claim 1, characterized in that: in, There is a uniform separation gap between the tread portion and the wheel rim portion, and the range of the separation gap is 1mm-3mm.

6. The low-wear wheelset according to claim 1, characterized in that: in, The tread portion is interference fit with the wheel axle, and a gap exists between the rim portion and the wheel axle.

7. A rail vehicle used on a track with multiple small radius curves, characterized in that: include: Track car bodies; as well as The low-wear wheelset is the low-wear wheelset described in any one of claims 1-6.

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