CN204239483U - A kind of sealing configuration of farm machinery bearing and dust cover thereof - Google Patents

Abstract

The utility model relates to a kind of sealing configuration of farm machinery bearing, comprise in bearing, outer ring and dust cover, the rubbery sealed body being at least with two flexible sealing lips is compounded with inside the rigid backbone of dust cover, the contact sealed end of flexible sealing lip radially extends to the inclination away from rigidity dirt lip in oblique shaft, each flexible sealing lip radially distributes, the outer circle wall of bearing inner race is provided with sealed step groove, rigid seal lip and sealed step groove Spielpassung, the axial end of at least one flexible sealing lip and sealed step groove is conflicted and is sealed and matched, and provide the dust cover of farm machinery bearing seal structure.The utility model solves conventional seals structure, and structure is not compact, and the problem of sealing effect difference, has compact structure, good seal performance and advantage easy to assembly.

Description

Sealing structure and dustproof cover for agricultural machinery bearing

technical field

The utility model relates to the field of bearings, specifically the bearings used on agricultural machinery, more precisely the sealing structure of the agricultural machinery bearing and the sealing element in the sealing structure.

Background technique

The environmental conditions of agricultural machinery use are relatively harsh, often accompanied by a large amount of dust, weeds, gravel or mud. Therefore, the sealing performance of agricultural machinery bearings is very high, and the seals of agricultural machinery bearings must be able to effectively prevent The outflow of internal grease affects the life of the bearing, and it is also necessary to prevent the intrusion of external mud and gravel particles from causing damage to the bearing. At the same time, under extremely harsh working conditions, such as planter opener bearings, lawn mower bearings, and ordinary bearings, the rubber cover seals are prone to fall off under the action of external force, and special seals are required to protect the bearings.

The sealing structure of the bearing on the existing agricultural machinery, such as the Chinese patent number ZL201020239950.7 "multi-lip composite dust cover and bearing sealing structure" (authorized announcement number: CN 201751635 U), its main structure is: bearing inner ring , the outer ring of the bearing and the dust cover between the inner and outer rings of the bearing. The radially outer end of the dust cover is embedded in the dust-proof groove on the outer ring of the bearing. The inner side of the rigid skeleton of the dust cover is compounded with a rubber seal body, the sealing body has at least two radial sealing lips, the rigid skeleton of the dust cover includes a mounting flange located at the radially outer end, an iron cover dust lip located at the radially inner end (the axial end face 57 in the literature), and The connection part located in the middle position (compound surface 56 in the literature), the rubber sealing body is compounded on the connection part, the dust-proof lip of the iron cover and the radial sealing lip on the rubber sealing body are arranged radially and arranged in the axial direction , The surface of the inner ring of the bearing that matches the radial sealing lip of the rubber sealing body is a straight surface. The multi-lip composite dust cover and bearing seal structure of the above structure have the following defects: In order to make the rubber sealing body better compound on the dust cover and meet the design of the radial sealing lip at the same time, the connecting part of the dust cover and the installation fold The side and radial sealing lip are designed with a certain knuckle angle, and the axial length of the connecting part is roughly the same as the axial length of the rubber sealing body, which will cause the axial length of the dust cover to become longer, which will not only bring inconvenience to assembly, but also Affect the internal design structure of the bearing (it needs to increase the width of the bearing or reduce the internal steel ball, at the cost of reducing the bearing capacity of the bearing, so as to compensate for the increase in the axial length of the dust cover); and the dust lip of the iron cover and the rubber sealing body The radial sealing lips on the rubber sealing body are arranged radially and arranged in the axial direction. The outer peripheral surface of the bearing inner ring matched with the radial sealing lip on the rubber sealing body is a flat surface. The contact seal between the lip and the inner ring of the bearing is unreliable, the operation flexibility is poor, and it brings inconvenience to the assembly of the dust cover.

Contents of the invention

Aiming at the deficiencies in the prior art, the purpose of the utility model is to provide a sealing structure for agricultural machinery bearings with reasonable structure design, compact structure, good sealing performance and convenient assembly.

In order to achieve the above purpose, the utility model provides the following technical solutions: a sealing structure of an agricultural machinery bearing, including a bearing inner ring, a bearing outer ring, and a dust cover located between the bearing inner ring and the outer ring. The cover includes a rigid skeleton, and a rubber sealing body is compounded on the inside of the rigid skeleton. At least two flexible sealing lips are arranged on the rubber sealing body. part, and the connecting part connecting the mounting flange and the rigid dustproof lip, the rubber sealing body is compounded on the connecting part, the mounting flange of the dust cover is installed on the outer ring of the bearing, and the flexible sealing lip on the rubber sealing body It is in conflicting and sealing cooperation with the inner ring of the bearing, and it is characterized in that: the contact sealing end of the flexible sealing lip extends obliquely in the radial direction away from the rigid dust-proof lip in the axial direction, and the flexible sealing lips are radially distributed, so The outer circumferential wall of the inner ring of the bearing is provided with a sealing step groove, the rigid sealing lip is in clearance fit with the sealing step groove, and at least one flexible sealing lip is in conflict and sealing fit with the axial end surface of the sealing step groove.

By adopting the above technical scheme, the shape design of the flexible sealing lip reduces the axial length of the rubber sealing body, and the structure of the dust cover is more compact. The inner ring of the bearing adopts a sealing step groove to cooperate with the dust cover, and the sealing fit is reliable. The characteristics of the sealing step groove on the inner ring of the bearing are used to form a seal with good sealing performance. At the same time, the structure is compact after assembly, and the assembly is more labor-saving and convenient.

The utility model is further set as: the outer peripheral wall of the inner ring of the bearing is provided with a second sealing step located inside the sealing step groove, at least one flexible sealing lip is placed in the second sealing step, and is connected with the second sealing step The radial end faces of the seals interfere with the sealing fit.

By adopting the above-mentioned technical scheme, the double-step design has better sealing performance.

The utility model is further set as follows: there are two flexible sealing lips, namely the inner flexible sealing lip and the outer flexible sealing lip, the outer sealing lip is located in the sealing step groove, and the inner flexible sealing lip is located in the second sealing lip In the step, the angles between the outer flexible sealing lip and the rigid dust-proof lip, and the inner flexible sealing lip and the outer flexible sealing lip are designed as acute angles.

By adopting the above technical solution, the number of flexible sealing lips is designed reasonably, which not only ensures the reliability of the sealing fit, but also ensures the strength and sealing elastic force of the flexible sealing lips.

The utility model is further configured as follows: the axial end surface of the sealing stepped groove is a slope surface at an obtuse angle with the radial end surface of the sealing stepped groove.

By adopting the above technical proposal, the flexible sealing lip in contact with the axial end surface of the sealing step groove is improved, the reliability of sealing cooperation is improved, and the sealing performance is improved.

The utility model is further configured as follows: the connecting part of the rigid frame and the rigid dust-proof lip are in the shape of a straight plate connected smoothly.

By adopting the above technical scheme, the rigid skeleton has a simple structure and is convenient to process.

A dustproof cover includes a rigid framework, a rubber sealing body is compounded on the inside of the rigid framework, at least two flexible sealing lips are arranged on the rubber sealing body, and the rigid framework includes an installation flange located at the radially outer end, which is located at the radially inner The rigid dust-proof lip at the end, and the connecting part connecting the installation flange and the rigid dust-proof lip, the rubber sealing body is compounded on the connecting part, and it is characterized in that: the contact sealing end of the flexible sealing lip is along the radial direction It extends obliquely and axially away from the rigid dust-proof lip, and each flexible sealing lip is radially distributed.

By adopting the above technical solution, the shape design of the flexible sealing lip reduces the axial length of the rubber sealing body, the structure of the dust cover is more compact, and the elastic deformation of the axial and radial seals is reliable, and the sealing effect is good.

Below in conjunction with accompanying drawing, the utility model is further described.

Description of drawings

Fig. 1 is the structural schematic diagram of the sealing structure of the agricultural machinery bearing of the specific embodiment of the present invention;

Fig. 2 is a schematic diagram of the structure of the dustproof cover of the specific embodiment of the utility model.

Detailed ways

Referring to accompanying drawings 1 and 2, the utility model discloses a sealing structure of an agricultural machinery bearing, including a bearing inner ring 1, a bearing outer ring 2, and a dust cover located between the inner and outer rings 1 and 2 of the bearing 3. The dust cover 3 includes a rigid skeleton 31, and the inner side of the rigid skeleton 31 is compounded with a rubber sealing body 32 (it should be pointed out here that: the inner side of the rigid skeleton 31 is the side of the rigid skeleton 31 facing the inside of the bearing, and the corresponding The other side is the outer side), the rubber sealing body 32 is provided with at least two flexible sealing lips 321, 322; the rigid skeleton 31 includes a mounting flange 311 at the radially outer end, and a rigid dustproof lip 312 at the radially inner end , and the connection part 313 connecting the installation flange 311 and the rigid dustproof lip 312; the rubber seal 32 is compounded on the connection part 313, and the installation flange 311 of the dust cover 3 is installed in the installation groove on the bearing outer ring 2 21, the flexible sealing lips 321, 322 on the rubber sealing body 32 are in conflict and sealing cooperation with the inner ring 1 of the bearing.

The contact sealing ends of the flexible sealing lips 321, 322 extend obliquely in the radial direction away from the rigid dustproof lip 321, and the flexible sealing lips 321, 322 are radially distributed. The bearing inner ring 1 There is a sealing step groove 11 on the outer peripheral wall of the sealing groove 11, and the rigid sealing lip 321 is in clearance fit with the sealing step groove 11, and at least one flexible sealing lip is in conflict and sealing fit with the axial end surface 111 of the sealing step groove 11. The shape design of the flexible sealing lip on the rubber sealing body reduces the axial length of the rubber sealing body, and the structure of the dust cover is more compact. The inner ring of the bearing adopts a sealing step groove to cooperate with the dust cover, and the sealing fit is reliable. The sealing step groove on the inner ring of the bearing has its own characteristics, forming a seal with good sealing performance. At the same time, the structure is compact after assembly, and the assembly is more labor-saving and convenient.

Further, the outer peripheral wall of the bearing inner ring 1 is provided with a second sealing step 12 located inside the sealing step groove 11, at least one flexible sealing lip is placed in the second sealing step 12, and is connected with the second sealing step The radial end face 121 of 12 interferes with the sealing fit. In this way, the double-step design is adopted, and the sealing performance is better.

In this specific embodiment, there are two flexible sealing lips, namely the inner flexible sealing lip 322 and the outer flexible sealing lip 321, the outer sealing lip 321 is located in the sealing step groove 11, and the inner flexible sealing lip 322 Located in the second sealing step 12 , the angles between the outer flexible sealing lip 321 and the rigid dust-proof lip 312 , and the inner flexible sealing lip 322 and the outer flexible sealing lip 321 are designed as acute angles. Of course, more than 3 flexible sealing lips can be designed according to the needs, but the design of two sealing lips can already meet the sealing requirements, and the design of more than 3 flexible sealing lips, the existing design structure is more complicated, and the processing is inconvenient. In addition, the strength of the flexible sealing lip will be weakened, and the deformation and elasticity will become poor.

Wherein, the axial end surface 111 of the sealing stepped groove 11 is a slope surface at an obtuse angle with the radial end surface 112 of the sealing stepped groove 11 , and the outer flexible sealing lip 321 collides with the slope surface to form a sealing fit. The flexible sealing lip in contact with the axial end surface of the sealing step groove is improved, the reliability of sealing cooperation is improved, and the sealing performance is improved.

Wherein, after the shape of the flexible sealing lip on the rubber sealing body 32 is designed, the connecting portion 313 of the rigid frame 31 and the rigid dust-proof lip 312 can be designed as a straight plate that is smoothly connected; the rigid frame has a simple structure and is easy to process.

The dust-proof cover disclosed by the utility model is the dust-proof cover in the above-mentioned sealing structure of the agricultural machinery bearing, and its structure has been described in detail, so it will not be repeated separately.

Claims (8)

1. A sealing structure for agricultural machinery bearings, comprising a bearing inner ring, a bearing outer ring and a dust cover between the bearing inner and outer rings, the dust cover includes a rigid skeleton, and the inside of the rigid skeleton is compounded with rubber The sealing body, the rubber sealing body is provided with at least two flexible sealing lips, the rigid skeleton includes a mounting flange at the radially outer end, a rigid dust-proof lip at the radially inner end, and a connection between the mounting flange and the rigid dust-proof lip The connecting part of the rubber sealing body, the rubber sealing body is compounded on the connecting part, the installation flange of the dust cover is installed on the outer ring of the bearing, the flexible sealing lip on the rubber sealing body is in conflict with the inner ring of the bearing, and it is characterized in that: The contact sealing end of the flexible sealing lip extends obliquely in the radial direction away from the rigid dust-proof lip, and the flexible sealing lips are radially distributed, and the outer peripheral wall of the inner ring of the bearing is provided with a seal In the step groove, the rigid sealing lip is in clearance fit with the sealing step groove, and at least one flexible sealing lip is in conflicting and sealing fit with the axial end surface of the sealing step groove. 2. The sealing structure of the agricultural machinery bearing according to claim 1, characterized in that: the outer peripheral wall of the inner ring of the bearing is provided with a second sealing step located inside the sealing step groove, and at least one flexible sealing lip is placed The second sealing step is in conflict with the radial end surface of the second sealing step. 3. The sealing structure of the agricultural machinery bearing according to claim 2, characterized in that: there are two flexible sealing lips, namely the inner flexible sealing lip and the outer flexible sealing lip, and the outer sealing lip is located at the sealing step In the groove, the inner flexible sealing lip is located in the second sealing step, and the angles between the outer flexible sealing lip and the rigid dust-proof lip, and the inner flexible sealing lip and the outer flexible sealing lip are designed as acute angles. 4. The sealing structure of the agricultural machinery bearing according to claim 1, 2 or 3, characterized in that: the axial end surface of the sealing stepped groove is a slope surface forming an obtuse angle with the radial end surface of the sealing stepped groove. 5 . The sealing structure of the agricultural machinery bearing according to claim 1 , 2 or 3 , characterized in that: the connecting part of the rigid frame and the rigid dust-proof lip are in the shape of straight plates connected smoothly. 6 . 6. A dustproof cover, comprising a rigid frame, a rubber sealing body is compounded on the inside of the rigid frame, at least two flexible sealing lips are arranged on the rubber sealing body, and the rigid frame includes an installation flange located at the radially outer end. The rigid dust-proof lip at the inward end, and the connecting part connecting the mounting flange and the rigid dust-proof lip, the rubber sealing body is compounded on the connecting part, and it is characterized in that: the contact sealing end of the flexible sealing lip is along the The radial direction extends obliquely and axially away from the rigid dust-proof lip, and the flexible sealing lips are radially distributed. 7. The dustproof cover according to claim 6, characterized in that: there are two flexible sealing lips, namely the inner flexible sealing lip and the outer flexible sealing lip, and the outer flexible sealing lip and the rigid dustproof lip The angles between the inner flexible sealing lip and the outer flexible sealing lip are designed as acute angles. 8. The dustproof cover according to claim 6 or 7, characterized in that: the connecting part of the rigid framework and the rigid dustproof lip are in the shape of a straight plate connected smoothly.