CN209938609U - Low-floor vehicle, bogie and bearing sealing structure thereof - Google Patents

Abstract

The utility model discloses a low floor vehicle, a bogie and a bearing sealing structure thereof, wherein the bearing sealing structure comprises a sealing stator fixedly connected with a wheel and a sealing rotor fixedly connected with an axle; the sealing stator is matched with the sealing rotor, and at least two stages of dynamic sealing pairs which are arranged in sequence are arranged between the sealing stator and the sealing rotor; at least one stage is a first dynamic sealing pair formed in an axially matched mode, and at least one other stage is a second dynamic sealing pair formed in a radially matched mode. The bearing sealing structure provided by the scheme has the advantages that through structural optimization, the problem that the lubricating performance is influenced by the fact that the bogie shaft end shaft bears external factors can be effectively avoided, and the technical guarantee is provided for safe and reliable operation of a vehicle.

Description

Low-floor vehicle, bogie and bearing sealing structure thereof

Technical Field

The utility model relates to a track traffic technical field, concretely relates to low-floor vehicle, bogie and bearing seal structure thereof.

Background

As is well known, low-floor vehicles are widely favored due to their simple structure and high environmental adaptability. However, existing low-floor vehicles are mostly operated in the open air, and the vehicle floor height is relatively low. In the actual operation process, the problem of poor lubrication caused by mixing of impurities such as external dust, moisture and the like into grease is easily caused to occur to the bogie bearing.

In view of the above, there is a need for a new and improved design for a bogie bearing seal for low floor vehicles to overcome the above-mentioned deficiencies of the prior art.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem, the utility model provides a low floor vehicle, bogie and bearing seal structure thereof, this bearing seal structure passes through configuration optimization, can effectively avoid the problem that bogie axle head axle bore external factor influences lubricating property.

The utility model provides a bearing sealing structure, which comprises a sealing stator fixedly connected with a wheel and a sealing rotor fixedly connected with an axle; the sealing stator is matched with the sealing rotor, and at least two stages of dynamic sealing pairs which are arranged in sequence are arranged between the sealing stator and the sealing rotor; at least one stage is a first dynamic sealing pair formed in an axially matched mode, and at least one other stage is a second dynamic sealing pair formed in a radially matched mode.

Preferably, a first static sealing pair is arranged between the matching surfaces of the sealing stator and the axle, and comprises a first sealing ring arranged between the first sealing pair and the axle and sealing glue coated between the first sealing ring and the axle.

Preferably, a second static sealing pair is arranged between the matching surfaces of the sealing rotor and the wheel, and the second static sealing pair comprises sealing glue coated between the sealing rotor and the wheel.

Preferably, the body of the sealing stator has a first ring groove opening towards the sealing rotor, the body of the sealing rotor has a second ring groove opening towards the sealing stator; the stator outer ring body outside the first ring groove of the sealed stator is inserted into the second ring groove so as to form the first dynamic sealing pair in an axially adaptive manner; and the rotor inner ring body at the inner side of the second ring groove of the sealing rotor is inserted in the first ring groove to form the second dynamic sealing pair along the radial direction.

Preferably, a second sealing ring is arranged between the end part of the outer ring body of the stator and the groove bottom of the second ring groove to construct the first dynamic sealing pair; and a third sealing ring is arranged between the inner surface of the inner ring body of the rotor and the inner groove wall of the first ring groove so as to construct the second dynamic sealing pair.

Preferably, a waterproof ring groove is formed in an outer circumferential surface of the rotor outer ring body outside the second ring groove of the sealing rotor, and the waterproof ring groove is formed at a position close to an extending end of the rotor outer ring body.

Preferably, the outer circumferential surface of the stator outer ring body of the sealed stator is provided with a water drainage ring groove, the water drainage ring groove is arranged at the root of the stator outer ring body, and the water drainage ring groove extends into the rotor outer ring along the axial direction.

The utility model also provides a pair of bogie, including the axletree of looks adaptation, wheel and arrange the bearing between the two in, still include as before bearing seal structure.

Preferably, an oil injection hole and an exhaust hole are formed in the side surface, matched with the sealing rotor, of the wheel; the oil filling hole is communicated to the inner end of the bearing, the inlet of the exhaust hole is positioned on the side surface of the wheel, a communication groove is formed in the position, corresponding to the bearing, of the sealing rotor, and the communication groove can be communicated with the outer end of the bearing and the inlet of the exhaust hole.

The utility model also provides a low floor vehicle, include as before the bogie.

Aiming at the characteristic of bad operation environment of low-floor vehicles, the utility model adopts the matched sealing stator and sealing rotor to construct the foundation structure of the sealing bearing, after the assembly is completed, the sealing stator is fixedly connected with the wheels, and the sealing rotor is fixedly connected with the axle; at least two stages of dynamic sealing pairs are arranged between the two sealing pairs; at least one stage is a first dynamic sealing pair formed in an axially matched mode, and at least one other stage is a second dynamic sealing pair formed in a radially matched mode. In the course of the work, for the sealed stator of fixed setting, sealed rotor rotates along with the wheel is synchronous, and the dynamic seal between the two is vice can form effectively sealedly respectively radially and axially, from this, to the sealed demand of bearing under the open-air operation environment, this scheme provides reliable multistage, the sealed guarantee of multi-angle, effectively prevents that external pollutant, moisture content from getting into in the bearing and influencing the lubricity. Has the characteristics of compact and reasonable combination and convenient installation, maintenance and operation.

In the preferred scheme of the invention, a sealing ring is arranged between the matching surfaces of the sealing stator and the axle, and sealant is coated between the sealing stator and the axle, namely a first static sealing pair; meanwhile, sealant is coated between the matching surfaces of the sealing rotor and the wheel, namely a second static sealing pair. According to the arrangement, the sealing protection is further added in the static fit connection relation, and on the basis of realizing the sealing guarantee by the structure, double sealing protection is realized by using process protection measures.

In another preferred aspect of the present invention, a waterproof ring groove is provided on the outer circumferential surface of the rotor outer ring body that seals the rotor, the waterproof ring groove being provided at a position near the end from which the rotor outer ring body extends, and being capable of guiding and dropping liquid substances such as external rainwater and preventing the external rainwater and the like from entering the inner seal; in addition, the outer peripheral surface of the stator outer ring body is provided with a water drainage ring groove which is arranged at the root part of the stator outer ring body and extends into the rotor outer ring along the axial direction, so that a small amount of rainwater which is not guided by the water-proof ring groove and falls down is further guided, and a reliable external barrier is formed.

In another preferred scheme of the invention, an oil filling hole and an exhaust hole are formed in the side surface of the wheel, which is matched with the sealing rotor, when lubricating grease needs to be injected, the lubricating grease reaches the inner end of the bearing, namely the end of the bearing, which is positioned in the wheel, from the oil filling hole, and meanwhile, the outer end of the bearing is communicated with the exhaust hole through the communication groove in the sealing rotor, so that gas possibly existing in an oil duct can be directly discharged in the oil filling process, smooth oil filling is ensured, and the lubricating grease can be ensured to be filled into the part to be lubricated of the bearing, and good lubricating performance is obtained.

Drawings

FIG. 1 is a schematic view of the overall structure of the bearing seal structure in an embodiment;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a cross-sectional view of the wheel shown in FIG. 1;

fig. 4 shows a schematic view of the wheel-engaging face of the sealing rotor.

In the figure:

the wheel 10, the oil filling hole 101, the exhaust hole 102, the inlet 1021, the concave ring part 103, the axle 20, the step section 201 and the bearing 30;

the sealing structure comprises a sealing stator 1, a first ring groove 11, a stator outer ring body 12, a water drainage ring groove 121, a step section 13, a sealing rotor 2, a second ring groove 21, a rotor inner ring body 22, a positioning convex ring 23, a rotor outer ring body 24, a waterproof ring groove 241, a communication groove 25, a second sealing ring 3, a third sealing ring 4 and a first sealing ring 5.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Without loss of generality, the embodiment takes the bearing connection form of the bogie shown in fig. 1 as a description basis, and the improvement scheme of the bearing sealing structure provided by the application is explained in detail. It should be understood that the contour shapes and dimensional ratios of the bogie axle and wheel shown in the figures are not essential limitations to the claimed solution.

Referring to fig. 1, the overall structure of the bogie bearing seal structure according to the present embodiment is schematically shown.

It should be clear that the assembly relationship between the wheel 10 and the axle 20 in the present embodiment is the same as that in the prior art, and a bearing 30 is disposed between the wheel 10 and the axle 20 to realize the rotation function of the wheel 10. Of course, in order to clearly express the core utility model point of the present application, the sealing function implementation based on the large bearing side shown in fig. 1 will be specifically explained herein. Please refer to fig. 2, which is an enlarged view of a portion a of fig. 1.

The bearing sealing structure provided by the scheme is provided with two basic adaptation components, namely a sealing stator 1 and a sealing rotor 2. As shown in the figure, the sealing stator 1 is used for being fixedly connected with a wheel 10, and the sealing rotor 2 is used for being fixedly connected with an axle 20; two stages of dynamic seal pairs which are sequentially arranged are arranged between the matched sealing stator 1 and the sealing rotor 2, wherein one stage is a first dynamic seal pair which is formed in an axially matched mode, and the other stage is a second dynamic seal pair which is formed in a radially matched mode.

In the vehicle operation process, for fixed sealed stator 1 that sets up, sealed rotor 2 rotates along with the wheel is synchronous, and the dynamic seal between the two is vice can form effective seal respectively radially and axially, from this, to the sealed demand of bearing under the open-air operation environment, this scheme provides reliable multistage, the sealed guarantee of multi-angle, can prevent effectively that external pollutant, moisture content from getting into in the bearing. It is understood that the first dynamic seal pair and the second dynamic seal pair are shown only as exemplary preferred illustrations, and in fact, the specific arrangement and number of the two types of dynamic seal pairs can be selected based on the specific product, and it is within the scope of the present application to satisfy the functional requirements of forming effective seals in the radial direction and the axial direction, respectively.

As a further preference, the body of the sealing stator 1 has a first annular groove 11 opening towards the sealing rotor 2, and correspondingly the body of the sealing rotor 2 has a second annular groove 21 opening towards the sealing stator 1. The stator outer ring body 12 outside the first ring groove 11 of the sealed stator 1 is inserted into the second ring groove 21 to form a first dynamic sealing pair in an axially adaptive manner; the rotor inner ring 22 inside the second ring groove 21 of the sealing rotor 2 is inserted into the first ring groove 11 to form a second dynamic sealing pair along the radial direction. The structure makes full use of axial and radial size spaces, and has higher structural compactness on the basis of obtaining better sealing performance.

Specifically, a second sealing ring 3 is arranged between the end part of the outer stator ring body 12 and the groove bottom of the second ring groove 21 to construct the first dynamic sealing pair; that is, the first dynamic sealing pair is formed by pressing the second sealing ring 3 in the axial direction, and the second sealing ring 3 may adopt different structural forms, such as but not limited to a V-shaped sealing ring shown in the figure.

In addition, a third sealing ring 4 is arranged between the inner surface of the rotor inner ring 22 and the inner groove wall of the first ring groove 11 to construct the second dynamic sealing pair; i.e. radially against the third sealing ring 4 to open up a second dynamic sealing pair. Likewise, the third sealing ring 4 may also take a different form of construction, such as, but not limited to, the rectangular cross-section sealing ring shown in the figures.

It should be noted that the second dynamic sealing pair is arranged on the circumferential surface of the component and has a certain axial matching length, and the third sealing ring 4 can be arranged in a plurality of numbers, such as but not limited to two shown in the figures, based on the requirement of the sealing degree. Furthermore, the mounting groove of the third sealing ring 4 is not limited to the inner groove wall of the first ring groove 11, and obviously, can be arranged on the inner surface of the rotor inner ring 22, and a good radial sealing can be obtained.

In order to further improve the bearing sealing performance, a first static sealing pair can be arranged between the matching surfaces of the sealing stator 1 and the axle 20, and the first static sealing pair comprises a first sealing ring 5 arranged between the first sealing ring and the axle and a sealing glue coated between the first sealing ring and the axle. Preferably, an adapting table stage is respectively arranged between the matching parts of the axle 20 and the sealing stator 1, and as shown in fig. 2, the table stage 13 of the sealing stator 1 is sleeved on the step section 201 of the axle 10 and has the function of pre-positioning in assembly. The first sealing ring 5 is arranged at the corner of the adaptive step, and processing and assembling are facilitated. Accordingly, a second static sealing pair is arranged between the matching surfaces of the sealing rotor 2 and the wheel 10, and the second static sealing pair can be sealing glue coated between the two static sealing pairs. Preferably, the body of the sealing rotor 2 may be provided with a positioning flange 23 extending axially into the bearing mounting hole, and the positioning flange 23 may be radially pre-positioned with the bearing mounting hole to facilitate subsequent fixation of the sealing rotor 2 to the wheel 10 by means of a threaded fastener.

Here, because the sealing rotor 2 and the wheel 10 are approximately vertical matching surfaces, the sealing function can be met only by gluing, no sealing ring is required to be added, and the product cost is saved. According to the arrangement, the sealing protection is further added in the static fit connection relation, and on the basis of realizing the sealing guarantee by the structure, double sealing protection is realized by using process protection measures.

In addition, on the basis of the internal sealing means, the scheme can be additionally provided with an auxiliary structure which is externally beneficial to lubrication.

As shown in fig. 1 and 2, the outer circumferential surface of the outer ring body 24 of the rotor outside the second ring groove 21 of the sealing rotor 1 is provided with a water-proof ring groove 241, and the water-proof ring groove 241 is provided at a position near the protruding end of the outer ring body 24 of the rotor, so that external liquid substances such as rainwater can be guided and fall down along the sealing rotor 1, and the external rainwater can be prevented from entering the interior, thereby guiding and discharging external fluid that can fall into the mating interface with the sealing stator 1 to the maximum.

Further, a water discharge ring groove 121 is formed on the outer circumferential surface of the stator outer ring body 12, and the water discharge ring groove 121 is formed at the root of the stator outer ring body 12, that is, at the connection position of the stator outer ring body 12 and the body; and extends into the rotor outer ring along the axial direction, and is equivalent to the water discharge ring groove 121 with certain width redundancy; in this way, a small amount of rainwater that is not guided to fall by the waterproof ring groove 241 is further guided, thereby forming a reliable outer barrier.

In addition to the bearing seal structure, the present embodiment also provides a bogie including the bearing seal structure, the bogie bearing additionally has a good oil injection structure, and an oil injection hole 101 and an exhaust hole 102 are opened on a side surface of the wheel 10 that is adapted to the seal rotor 2; referring to fig. 1 and 3 together, fig. 3 is a cross-sectional view of the wheel.

As shown, an oil filler hole 101 communicates with an inner end of the bearing 30, and when oil grease injection is required, the oil grease reaches the inner end of the bearing 30, that is, the end of the bearing 30 located in the wheel 10, from the oil filler hole 101. The inlet 1021 of the exhaust port 102 is also located on the side surface of the wheel 10.

As a communicating member of the exhaust path, a communicating groove 25 is opened at a position of the sealing rotor 2 corresponding to the bearing 30, and further refer to fig. 4, which shows a schematic view of a surface of the sealing rotor mating with the wheel. The communication groove 25 can communicate the outer end of the bearing 30 with the inlet 1021 of the exhaust hole 102, that is, in the axial projection plane, the communication groove 25 is at least partially overlapped with the outer end of the bearing 30 and the inlet 1021; therefore, gas possibly existing in the oil duct can be directly exhausted through the exhaust path in the oil injection process, smooth oil injection is guaranteed, lubricating grease can be filled into parts to be lubricated of the bearing, and good lubricating performance is achieved.

Although the communication groove 25 is a radially disposed elongated groove as shown in the drawings, the specific shape of the communication groove 25 may be arbitrarily set as long as the communication between the outer end of the bearing 30 and the inlet 1021 is achieved and the strength of the member is also required. In addition, an inner concave ring part 103 can be arranged on the wheel 10, so that an inlet of the oil filling hole 101 and an outlet of the exhaust hole 102 can be arranged in the inner concave ring part 103, namely, two connector parts do not protrude out of the body of the wheel 10, the problem that the corresponding connectors are damaged due to foreign matter impact in the running process of the vehicle is avoided, and smooth execution of the refilling operation of the lubricating grease is ensured. After the refilling operation is finished, the inlet of the oil filling hole 101 and the outlet of the exhaust hole 102 are screwed by adopting screw plugs respectively.

In addition to the aforementioned bogie and its bearing seal structure, the present embodiment also provides a low floor vehicle including the aforementioned bogie. Here, other functional components of the bogie can be realized by using the prior art, and thus, the detailed description is omitted.

In addition, the bearing sealing structure provided by the embodiment is not limited to be applied to a bogie bearing, and the structure can also be applied to any other railway vehicle needing bearing sealing.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims (10)

1. A bearing seal structure for sealing a bearing between a wheel and an axle, comprising:

the sealing stator is used for being fixedly connected with the wheel; and

the sealing rotor is fixedly connected with the axle; and is

The sealing stator is matched with the sealing rotor, and at least two stages of dynamic sealing pairs which are arranged in sequence are arranged between the sealing stator and the sealing rotor; at least one stage is a first dynamic sealing pair formed in an axially matched mode, and at least one other stage is a second dynamic sealing pair formed in a radially matched mode.

2. The bearing seal structure of claim 1, wherein a first static seal pair is provided between the mating surfaces of the seal stator and the axle, the first static seal pair including a first seal ring disposed therebetween and a sealant applied therebetween.

3. The bearing seal structure of claim 2 wherein said seal rotor has a second static seal pair between mating surfaces of said wheel, said second static seal pair including a sealant applied therebetween.

4. The bearing seal structure according to any one of claims 1 to 3, wherein the body of the seal stator has a first ring groove opening toward the seal rotor, the body of the seal rotor has a second ring groove opening toward the seal stator; the stator outer ring body outside the first ring groove of the sealed stator is inserted into the second ring groove so as to form the first dynamic sealing pair in an axially adaptive manner; and the rotor inner ring body at the inner side of the second ring groove of the sealing rotor is inserted in the first ring groove to form the second dynamic sealing pair along the radial direction.

5. The bearing seal structure according to claim 4, wherein a second seal ring is provided between an end of the outer ring body of the stator and a groove bottom of the second ring groove to construct the first dynamic seal pair; and a third sealing ring is arranged between the inner surface of the inner ring body of the rotor and the inner groove wall of the first ring groove so as to construct the second dynamic sealing pair.

6. The bearing seal structure according to claim 4, wherein a water-proof ring groove is provided in an outer peripheral surface of the outer ring body of the rotor outside the second ring groove of the seal rotor, the water-proof ring groove being provided at a position near an end of the outer ring body of the rotor which extends out.

7. The bearing seal structure according to claim 6, wherein a drain ring groove is provided on an outer peripheral surface of the stator outer ring body of the seal stator, the drain ring groove is provided at a root portion of the stator outer ring body, and the drain ring groove extends axially into the rotor outer ring.

8. A bogie comprising a matching axle, a wheel and a bearing interposed therebetween, further comprising a bearing seal structure according to any one of claims 1 to 7.

9. The bogie of claim 8, wherein the side surface of the wheel fitted with the sealing rotor is provided with oil injection holes and air exhaust holes; the oil filling hole is communicated to the inner end of the bearing, the inlet of the exhaust hole is positioned on the side surface of the wheel, a communication groove is formed in the position, corresponding to the bearing, of the sealing rotor, and the communication groove can be communicated with the outer end of the bearing and the inlet of the exhaust hole.

10. A low floor vehicle comprising a bogie as claimed in any one of claims 8 or 9.

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