CN113682389B - Thrust wheel and engineering machine - Google Patents

Abstract

The invention provides a roller and a construction machine. The roller includes a wheel axle, a roller body, an end cover and a floating seal assembly. The opposite side of the two floating seal ring bodies of the roller is the first sealing surface, the opposite side of the two extension parts is the contact surface, the two contact surfaces are the second sealing surface, and the two contact surfaces are inclined outward from the axle shaft. , Under the normal sealing state of the floating seal assembly, the two first sealing surfaces are in close contact and slide relative to each other to form a bright sealing band; under severe working conditions, when the roller is subjected to eccentric load force and radial and axial movement occurs, the two first sealing surfaces The second sealing surfaces can be in close contact with each other to form an effective sealing bright band to ensure the sealing effect of the floating seal ring and prevent oil leakage; at the same time, the setting of the extension part increases the entry path for impurities such as external dust and sediment into the wheel body. Compared with the existing floating seal ring structure, it is more difficult for impurities to enter the wheel body, preventing impurities from damaging the oil film and further preventing oil leakage of the roller.

Description

A kind of roller and construction machinery

technical field

The invention relates to the technical field of construction machinery seals, in particular to a roller and construction machinery.

Background technique

As a key component of the "four wheels and one belt" of the traveling mechanism, the rollers are widely used in crawler excavators. The reliability of the rollers often directly affects the walking performance of the excavator, which in turn affects the operating efficiency of the whole machine. At present, most of the rollers use a floating oil seal to form a mechanical seal structure. The floating seal ring of the floating oil seal is in the shape of a saddle. The opposite surfaces of the two floating seal rings are closely matched and slide relative to each other to achieve sealing, so as to ensure the normal operation of the roller and prevent the outside world. Dust, sediment and other impurities enter the roller body through the floating seal ring to prevent the leakage of lubricating oil inside the roller body.

The opposite surfaces of the two floating seal rings are the sealing surfaces, and there is only one contact surface that the floating seal rings can contact with the seal during operation. However, the working environment of the excavator is very harsh, and the rollers need to work in complex, muddy and dusty conditions. During the use, they are often subjected to eccentric load force, which causes the floating seal ring to have a certain degree of axial and radial channeling. The opposite surfaces of the two floating seal rings are separated from each other, resulting in seal failure and oil leakage; in addition, a gap needs to be left between the wheel body and the end cover of the roller during assembly, and impurities such as mud and sand can easily enter through this gap. The wheel body will destroy the floating seal oil film, resulting in oil leakage of the roller.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present invention is to overcome the fact that the floating oil seal structure of the roller in the prior art is easy to seal failure and cause oil leakage when working under severe working conditions, and impurities are easy to pass between the wheel body and the end cover of the roller. The gap enters the wheel body, destroying the floating seal oil film and causing the roller to leak oil.

To this end, the present invention provides a roller, which includes an axle, a roller body, an end cover and a floating seal assembly. The roller body is sleeved on the outside of the axle; the end cover is arranged on the end of the axle and A floating seal chamber is enclosed with the roller body, and there is a gap between the end cover and the roller body; a floating seal assembly is arranged in the floating seal chamber, and the floating seal assembly includes a portion along the wheel shaft. Two floating seal rings and two floating seal rubber rings arranged in sequence in the axial direction; wherein, the floating seal ring comprises a floating seal ring body and an extension part extending outward from the floating seal ring body, and the extension part Extends outwardly away from a radial direction of the axle.

Optionally, in the above-mentioned rollers, the extension directions of the extension parts of the two floating seal rings are the same.

Optionally, in the above-mentioned roller, the extension portion includes a radially extending section and a bending section that are connected to each other.

Optionally, in the above-mentioned roller, the bending section is in a curved or bent shape.

Optionally, in the above-mentioned roller, the opposite surfaces of the two bending segments are bending surfaces formed by a plurality of planes connected in sequence.

Optionally, in the above-mentioned roller, the outer end surface of the roller body is provided with a first concave portion, and the first concave portion is matched with the bending section located on the inner side; the inner end surface of the end cover is A second concave portion is provided, and the second concave portion is matched with the bending section located on the outer side.

Optionally, in the above-mentioned roller, the roller body includes a first roller body and a second roller body, and the relative relationship between the first roller body and the second roller body is The ends are detachably connected together.

Optionally, in the above-mentioned roller, the opposite ends of the first roller body and the second roller body are detachably connected together through a threaded structure.

Optionally, in the above-mentioned roller, a lubricating cavity is provided in the middle of the roller body, an oil passage hole is arranged on the roller body, and both ends of the oil passage hole are connected to the floating seal chamber and the floating seal chamber. the lubricating cavity; the oil-passing hole is configured to accommodate a magnetic polymer filter and adsorbent material; the oil-passing hole is located on one side of the lubricating cavity and is provided with a tightening port, and the oil-passing hole is located in the floating seal One side of the chamber is provided with an oil hole plug.

The present invention provides a construction machine, comprising the roller described in any one of the above.

The technical scheme of the present invention has the following advantages:

1. In the roller provided by the present invention, the opposite side of the two floating seal ring bodies is the first sealing surface, the opposite side of the two extension parts is the contact surface, the two contact surfaces are the second sealing surface, and the two contact surfaces are The axial direction of the wheel shaft is inclined outward, that is, the second sealing surface is inclined relative to the first sealing surface, and the second sealing surface is different from the first sealing surface. Under the normal sealing state of the floating seal assembly, the two first sealing surfaces are in close contact and slide relative to each other to form a bright sealing band; under severe working conditions, when the roller is subjected to eccentric load force and causes radial and axial movement, the two first sealing surfaces The second sealing surface can be in close contact with each other to form an effective sealing bright band, which ensures the sealing effect of the floating seal ring and prevents oil leakage; at the same time, the setting of the extension part increases the entry path of external dust, sediment and other impurities into the wheel body, Compared with the existing floating seal ring structure, it is more difficult for impurities to enter the wheel body, preventing impurities from damaging the oil film and further preventing oil leakage of the roller.

2. The roller provided by the present invention has multiple contact surfaces in the bending section, and the multiple contact surfaces are different. When the roller is subjected to eccentric load force and causes the floating seal slip ring to move, the bending segment can be moved. There are many contact surfaces to form the sealing bright band, which can always form an effective sealing bright band to ensure the sealing effect.

3. In the roller provided by the present invention, the two wheel bodies of the roller can be detachably arranged, which is convenient for disassembling and replacing the one-side wheel body when oil leaks from one side of the roller, and saves the maintenance cost of the roller.

4. The roller provided by the present invention is provided with an oil-passing hole, and the oil-passing hole is suitable for accommodating a magnetic polymer filtering and adsorbing material. The magnetic polymer filter adsorption material can effectively absorb the debris generated by the wear of the bimetallic bushing or other components, prevent the debris from entering the floating seal chamber, and ensure the sealing effect of the roller.

5. In the construction machinery provided by the present invention, under severe working conditions, the two second sealing surfaces of the upper rollers can be in close contact with each other to form an effective sealing bright band, so as to ensure the sealing effect of the floating seal ring and prevent oil leakage; At the same time, the arrangement of the extension part increases the entry path for impurities such as external dust and sediment into the wheel body. Compared with the existing floating seal ring structure, it is more difficult for impurities to enter the wheel body, preventing impurities from damaging the oil film and further preventing oil leakage of the roller.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

1 is a cross-sectional view of a roller according to an embodiment of the present invention;

Fig. 2 is a partial enlarged view of part A in Fig. 1;

FIG. 3 is a partial enlarged view of part B in FIG. 2 .

Description of reference numbers:

1-axle; 21-first roller body; 22-second roller body; 23-thread structure; 24-lubrication cavity; 25-oil hole; 251-tightening port; 252-oil hole plug ; 26-first recess; 3-end cover; 31-second recess; 411-floating ring body; 412-extension; 4121-radial extension; 4122-bending segment; circle; 4-magnetic polymer filter adsorption material.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

This embodiment provides a roller, as shown in FIG. 1 and FIG. 2 , which includes an axle 1 , a roller body, an end cover 3 and a floating seal assembly. Wherein, the roller body is sleeved on the outside of the axle 1; the end cover 3 is arranged at the end of the axle 1 and forms a floating sealing chamber with the roller body. The end cover 3 and the support There is a gap between the heavy wheel bodies; the floating seal assembly is arranged in the floating seal chamber, the floating seal assembly includes two floating seal rings arranged in sequence along the axial direction of the wheel shaft 1, and the floating seal assembly further includes Two floating seal rubber rings 42; the floating seal ring includes a floating seal ring body 411 and an extension portion 412 extending outward from the floating seal ring body 411, the extension portion deviates outward from the radial direction of the wheel shaft extend.

In the roller of this structure, the opposite side of the two floating seal ring bodies 411 is the first sealing surface, the opposite side of the two extension parts is the contact surface, the two contact surfaces are the second sealing surface, and the two contact surfaces are separated by the wheel shaft. 1. The axial direction is inclined outward. For example, the contact surface can be inclined to the inside or the outside of the support wheel, that is, the second sealing surface is inclined relative to the first sealing surface, and the second sealing surface is different from the first sealing surface. Under the normal sealing state of the floating seal assembly, the two first sealing surfaces are in close contact and slide relative to each other to form a bright sealing band; under severe working conditions, when the roller is subjected to eccentric load force and causes radial and axial movement, the two first sealing surfaces The second sealing surface can be in close contact with each other to form an effective sealing bright band, which ensures the sealing effect of the floating seal ring and prevents oil leakage; at the same time, the setting of the extension part increases the entry path of external dust, sediment and other impurities into the wheel body, Compared with the existing floating seal ring structure, it is more difficult for impurities to enter the wheel body, preventing impurities from damaging the oil film and further preventing oil leakage of the roller.

Further, the extension directions of the extension parts of the two floating seal rings are the same, that is, the facing contact surfaces of the two extended parts are arranged in parallel, so that when the floating seal ring moves, the two facing and parallel contact surfaces can move toward each other. And close contact to form a sealed bright band.

The first sealing surface and the second sealing surface are both polished mirror surfaces, and the floating sealing rubber ring 42 is arranged in the floating sealing chamber and supported on the floating sealing ring. Further, referring to FIG. 2 , the extension portion includes a radially extending section 4121 disposed at the end of the floating seal ring body 411 and a radially extending section 4121 disposed at the end of the radially extending section 4121 and facing the radially extending section 4121 The bending section 4122 bent on one side, the radially extending section 4121 is formed by extending radially outward from the end of the floating seal ring body 411 , and the bending section 4122 is formed by extending outward from the end of the radially extending section 4121 . The opposite side of the two bending sections 4122 is used as the contact surface of the extension part, and when the floating seal ring moves, it is in close contact with each other to form a bright sealing band, so as to ensure the sealing effect of the roller.

Optionally, the bending section 4122 is curved or bent. For example, the bending section 4122 is curved, and the opposite outer walls of the two bending sections 4122 are smooth; referring to FIG. 3 , the opposite surfaces of the two bending sections 4122 are formed by a plurality of planes connected in sequence. The bending surface, that is, the contact surface of the bending section 4122 has multiple, and the multiple contact surfaces are different. When the roller is subjected to the eccentric load force and causes the floating seal slip ring to move, the bending section 4122 can form a seal The bright band has many contact surfaces, which can always form an effective sealing bright band to ensure the sealing effect. For example, the two bent sections 4122 are inclined toward the outside of the roller body from the radially extending section 4121 . Optionally, referring to FIG. 3 , a plurality of different planes of the bending surface are formed, and the longitudinal cross-sectional shape of the bending surface can be several continuous sides of a regular polygon, or several continuous sides of an arbitrary polygon, as long as the bending surface is ensured. The multiple planes of the folded surface are different. When the floating seal slip ring moves, when one plane cannot form a sealed bright band, the other inclined planes can form a sealed bright band, and the bending surface can form the contact of the sealed bright band. There are many surfaces to ensure that when the floating seal ring moves, an effective sealing bright band can always be formed.

Further, referring to FIG. 2 and FIG. 3 , the outer end surface of the roller body is provided with a first concave portion 26 , and the first concave portion cooperates with the bending section 4122 located on the inner side to accommodate the inner side bending portion 26 . Bending section 4122; the inner end surface of the end cover 3 is provided with a second recess 31, and the second recess cooperates with the bending section 4122 on the outside to accommodate the bending section 4122 on the outside.

Referring to FIG. 1 , the roller body includes a first roller body 21 and a second roller body 22 , and opposite ends of the first roller body 21 and the second roller body 22 The parts are detachably connected together. Since the failure rate of the rollers is high, and most of the rollers leak oil from one side of the rollers, the two wheel bodies of the existing rollers are welded and fixed. When the oil leaks from one side of the rollers, the entire rollers need to be replaced. Maintenance costs are high. The two wheel bodies of the supporting wheel of this structure are detachably arranged, which is convenient to disassemble and replace the one-sided wheel body when oil leaks from one side of the supporting wheel, thereby saving the maintenance cost of the supporting wheel. Optionally, opposite ends of the first roller body 21 and the second roller body 22 are detachably connected together through a screw structure 23 . For example, the end of the first roller body 21 is provided with an outer thread, and the end of the second roller body 22 is provided with an inner thread, and the inner and outer threads are matched to connect the two roller bodies, which is convenient to connect.

There is also a bimetallic bushing inside the roller. During the use of the bimetallic bushing, debris will be generated due to wear and tear, and the debris will enter the floating seal chamber with the lubricating oil, which will cause abnormal wear and oil leakage of the floating seal.

1 and 2 , a lubricating cavity 24 is provided in the middle of the roller body, and an oil passage hole 25 is provided on the roller body. Both ends of the oil passage hole 25 communicate with the floating seal chamber and the The lubricating cavity 24; the oil-passing hole 25 is configured to accommodate the magnetic polymer filter adsorption material 4; the oil-passing hole 25 is located on one side of the lubricating cavity and is provided with a tightening port 251, and the oil-passing hole 25 is located in the floating One side of the sealing chamber is provided with an oil hole plug 252, and the inside of the oil hole plug 252 is provided with a through hole for the circulation of lubricating oil. When installing the rollers, first add the magnetic polymer filter adsorption material 4 into the oil passage hole 25, and then place the oil hole plug 252 into the outer end of the oil passage hole 25 to prevent the adsorption material from leaking. The inner end of the oil passage hole 25 is provided with a tightening port 251 , which not only prevents the leakage of the adsorbent material, but also has the effect of saving the material cost of the oil hole plug 252 .

The magnetic polymer filter adsorption material 4 can effectively absorb the debris generated by the wear of the bimetallic bushing or other components, prevent the debris from entering the floating seal chamber, and ensure the sealing effect of the roller. Specifically, the lubricating cavity 24 is formed by surrounding the inner ends of the first roller body 21 and the second roller body 22 , and both the first roller body 21 and the second roller body 22 are provided with oil passage holes. 25, and the oil passage holes 25 on the two wheel bodies are symmetrically arranged.

Example 2

This embodiment provides a construction machine, which includes the roller in Embodiment 1.

In the construction machinery of this structure, under severe working conditions, the two second sealing surfaces of the upper rollers can be in close contact with each other to form an effective sealing bright band, which ensures the sealing effect of the floating seal ring and prevents oil leakage; The setting of the external part increases the entry path for impurities such as external dust and sediment into the wheel body. Compared with the existing floating seal ring structure, it is more difficult for impurities to enter the wheel body, preventing impurities from damaging the oil film and further preventing oil leakage of the roller.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.

Claims (10)

1. A thrust wheel is characterized by comprising

A wheel axle (1);

the thrust wheel body is sleeved outside the wheel shaft (1);

the end cover (3) is arranged at the end part of the wheel shaft (1) and encloses a floating seal chamber with the thrust wheel body, and a gap is formed between the end cover (3) and the thrust wheel body;

the floating seal assembly is arranged in the floating seal chamber and comprises two floating seal rings and two floating seal rubber rings which are sequentially arranged along the axial direction of the wheel shaft (1);

wherein the floating seal ring comprises a floating seal ring body (411) and an extension (412) extending outwardly from the floating seal ring body (411), the extension (412) extending outwardly away from a radial direction of the axle (1); the opposite surfaces of the two floating seal ring bodies (411) are first sealing surfaces, the opposite surfaces of the two extending parts (412) are second sealing surfaces, and the two second sealing surfaces can be in close contact with each other to form a bright sealing strip.

2. The bogie wheel according to claim 1, wherein the extensions (412) of the two floating seal rings extend in the same direction.

3. The bogie wheel according to claim 2, wherein the extension part (412) comprises a radially extending section (4121) provided at an end of the floating seal ring body (411) and a bent section (4122) provided at an end of the radially extending section (4121) and bent toward one side of the radially extending section (4121).

4. The bogie wheel according to claim 3, wherein the bending segment (4122) is curved or bent.

5. The bogie wheel according to claim 4 wherein the opposite surfaces of the two bending segments (4122) are bending surfaces formed by a plurality of planes connected in series.

6. The bogie wheel according to any of claims 3-5 wherein the outer end face of the bogie wheel body is provided with a first recess (26), the first recess (26) cooperating with the bend section (4122) located on the inner side, the inner end face of the end cap (3) being provided with a second recess (31), the second recess (31) cooperating with the bend section (4122) located on the outer side.

7. The bogie wheel according to any of claims 1 to 5, wherein the bogie wheel body comprises a first bogie body (21) and a second bogie body (22), opposite ends of the first bogie body (21) and the second bogie body (22) being detachably connected together.

8. The bogie wheel according to claim 7, wherein the opposite end portions of the first bogie body (21) and the second bogie body (22) are detachably connected together by a screw structure (23).

9. The thrust wheel according to any one of claims 1 to 5, wherein a lubricating cavity (24) is arranged in the middle of the thrust wheel body, a lubricating hole (25) is arranged on the thrust wheel body, two ends of the lubricating hole (25) are communicated with the floating seal chamber and the lubricating cavity (24), and the lubricating hole (25) is configured to accommodate a magnetic polymer filtering and adsorbing material (4); one side of the oil passing hole (25) positioned in the lubricating cavity (24) is provided with a tightening opening (251), and one side of the oil passing hole (25) positioned in the floating seal chamber is provided with an oil hole plug (252).

10. A working machine, characterized by comprising a bogie wheel according to any of claims 1-9.

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