Transmission case half shaft sealing structure and agricultural machine

Abstract

The utility model provides a transmission case half shaft sealing structure. The oil seal device comprises a half shaft, a sleeve, an oil seal end cover, a first oil seal, a second oil seal and an oil injection connector. The half shaft is connected with a transmission shaft in the transmission box; the sleeve is sleeved outside the half shaft; the oil seal end cover is arranged at the end, away from the transmission box, of the sleeve. A containing space is formed between the oil seal end cover and the half shaft. The first oil seal is arranged at the end, away from the half shaft, in the containing space. The second oil seal is arranged at the end, close to the half shaft, in the containing space, and a preset gap is reserved between the first oil seal and the second oil seal. The oil injection connector is arranged on the oil seal end cover and communicated with a preset gap formed between the first oil seal and the second oil seal. According to the utility model, the preset gap is filled by filling the lubricating grease between the first oil seal and the second oil seal to form internal pressure, so that muddy water is effectively prevented from entering, and the sealing reliability is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of agricultural machinery, in particular to a half shaft sealing structure of a transmission case and an agricultural machinery. Background Art

[0002] In the related art, the sealing method at the end of the drive shaft of the transmission case of agricultural machinery (such as tractors, harvesters) generally adopts combined oil seals, cartridge oil seals or ordinary oil seals, and their principle is all maze type. This structure cannot prevent mud and water from entering, and once the mud and water enter, they will break through layer by layer. Once the internal bearing is damaged by the mud and water, it may cause the overall scrapping of the gearbox, resulting in an increase in the after-sales and maintenance costs of the agricultural machinery. Therefore, it is necessary to provide a half shaft sealing structure of a transmission case to overcome the defects existing above. Content of the Utility Model

[0003] The purpose of the utility model is to provide a half shaft sealing structure of a transmission case and an agricultural machinery.

[0004] According to one aspect of the utility model, a half shaft sealing structure of a transmission case is provided, including: a half shaft, which is connected to the transmission shaft inside the transmission case and can transmit the power in the transmission case to the outside of the transmission case; a sleeve, one end of the sleeve is connected to the housing of the transmission case and is sleeved outside the half shaft; an oil seal end cover, which is arranged at the end of the sleeve far from the transmission case, and a receiving space is formed between the oil seal end cover and the half shaft; a first oil seal, which is arranged at the end of the receiving space far from the sleeve; a second oil seal, which is arranged at the end of the receiving space close to the sleeve, and a predetermined gap is left between the first oil seal and the second oil seal; an oil injection joint, which is arranged on the oil seal end cover and is communicated with the predetermined gap formed between the first oil seal and the second oil seal.

[0005] Preferably, a sealing sleeve is sleeved on the end of the half shaft, and a sealing ring is arranged between the sealing sleeve and the end of the half shaft.

[0006] Preferably, a first mounting portion is arranged on the outer peripheral surface of the sleeve, a second mounting portion is arranged on the outer peripheral surface of the oil seal end cover, and the sleeve and the oil seal end cover are connected by bolts between the first mounting portion and the second mounting portion.

[0007] Preferably, a first annular notch is arranged on the inner peripheral surface of the sleeve, a second annular notch is arranged on the outer peripheral surface of the half shaft, a bearing is arranged between the sleeve and the half shaft, one side of the bearing abuts against the first annular notch and the second annular notch, and the other side of the bearing abuts against the side wall of the sealing sleeve.

[0008] Preferably, the first oil seal includes a first skeleton, a first rubber body wrapped around the first skeleton, and a first elastic member sleeved on the circumference of the first rubber body. The first rubber body forms a first lip and a second lip, and one side of the first lip and the second lip abuts against the outer ring of the seal sleeve.

[0009] Preferably, the second oil seal is a cartridge oil seal.

[0010] Preferably, the second oil seal includes a second skeleton and a third skeleton with symmetrically distributed cross-sections. The outer ring of the second skeleton abuts against the inner wall of the casing. A second rubber body is arranged inside the inner ring of the second skeleton. The second rubber body extends along the side surface of the second skeleton to the inner ring of the second skeleton, and a second elastic member is arranged on the circumference of the second rubber body. The inner ring of the second rubber body forms a third lip and a fourth lip, and the third lip and the fourth lip abut against the outer ring of the third skeleton; A third rubber body is arranged inside the inner ring of the third skeleton. The inner ring of the third rubber body abuts against the half shaft and extends along the side surface of the third skeleton to the outer ring of the third skeleton. The second rubber body forms a fifth lip and a sixth lip, and the fifth lip and the sixth lip abut against the inner ring of the second skeleton.

[0011] Preferably, the end of the half shaft is also connected with a driving wheel through a spline.

[0012] Preferably, the oil injection joint further includes an oil filling cup, and the oil filling cup is connected to the oil injection joint and partially placed inside the oil injection joint.

[0013] According to another aspect of the present invention, an agricultural machine is provided, including the transmission case half shaft sealing structure.

[0014] Compared with the prior art, the transmission case half shaft sealing structure provided by the present invention has the following beneficial effects: By filling the predetermined gap with grease between the first oil seal and the second oil seal to form an internal pressure, the present invention effectively prevents the entry of muddy water and prevents the muddy water from entering the transmission case along the gap between the half shaft and the casing, ensuring the sealing reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below with reference to the drawings and specific embodiments:

[0016] Figure 1 It is a structural schematic diagram of a half shaft sealing structure in the related art;

[0017] Figure 2 It is a structural schematic diagram of the half shaft sealing structure in the present invention;

[0018] Figure 3 For the present invention Figure 2 A partial enlarged view of area A in it;

[0019] Figure 4 This is a partial enlarged view of region B in the present utility model Figure 3 ;

[0020] Explanation of reference numerals: 1, casing; 2, half shaft; 3, oil seal end cover; 4, first oil seal; 5, second oil seal; 6, oil injection joint; 7, drive wheel; 11, first annular notch; 12, first mounting portion; 21, second annular notch; 22, bearing; 23, sealing sleeve; 231, sealing ring; 31, second mounting portion; 41, first skeleton; 42, first rubber body; 43, first elastic member; 421, first lip; 422, second lip; 51, second skeleton; 52, second rubber body; 53, second elastic member; 54, third skeleton; 55, third rubber body; 521, third lip; 522, fourth lip; 551, fifth lip; 552, sixth lip; 61, filling oil cup. Detailed implementation manners

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] To make the drawings concise, only the parts related to the present utility model are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, for components with the same structure or function, only one of them is schematically shown, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation.

[0023] It should also be further understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0024] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0025] In addition, in the description of the present application, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0026] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will describe the specific embodiments of the present utility model with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other embodiments can also be obtained.

[0027] See Figure 1 , a half - shaft sealing structure of a transmission case is provided in the related art, including a half - shaft 2, a sleeve 1, an oil - seal end cover 3, and a first oil - seal 4'. The first oil - seal 4' is one of a combined oil - seal, a cartridge oil - seal, or a common oil - seal. No matter what kind of sealing method it is, its principle is to adopt a labyrinth type. This structure cannot prevent mud and water from entering. After mud and water enter, they will break through layer by layer. Its service life depends on the quality of the oil - seal. Once the internal bearing 22 is damaged by mud and water, it may cause the overall scrapping of the gearbox, resulting in an increase in the after - sales and maintenance costs of agricultural machinery.

[0028] To solve the problems in the related art, the present embodiment provides a half - shaft sealing structure of a transmission case, which is mainly applied to agricultural machinery such as tractors and harvesters. Refer to the attached Figures 2 to 4 , the half - shaft 2 sealing structure includes a half - shaft 2, a sleeve 1, an oil - seal end cover 3, a first oil - seal 4, a second oil - seal 5, and an oil - filling joint 6.

[0029] One end of the half - shaft 2 is connected to the transmission shaft inside the transmission case, and the other end of the half - shaft 2 is connected with a driving wheel 7 through a spline, capable of transmitting the power in the transmission case to the outside of the transmission case. One end of the sleeve 1 is connected to the housing of the transmission case and is sleeved outside the half - shaft 2. The oil - seal end cover 3 is arranged at the end of the sleeve 1 away from the transmission case, and a receiving space is formed between the oil - seal end cover 3 and the half - shaft 2.

[0030] The first oil - seal 4 is arranged at one end of the receiving space away from the sleeve 1. The second oil - seal 5 is arranged at one end of the receiving space close to the sleeve 1, and a predetermined gap is left between the first oil - seal 4 and the second oil - seal 5. The oil - filling joint 6 is arranged on the oil - seal end cover 3 and is communicated with the predetermined gap formed between the first oil - seal 4 and the second oil - seal 5.

[0031] The oil filling joint 6 further includes an oil filling cup 61. The oil filling cup 61 is connected to the oil filling joint 6 and partially placed inside the oil filling joint 6. During use, the user fills the predetermined gap by filling grease between the first oil seal 4 and the second oil seal 5 through the oil filling cup 61 to form an internal pressure, effectively preventing the entry of muddy water and preventing the muddy water from entering the transmission case along the gap between the half shaft 2 and the casing 1, ensuring the sealing reliability.

[0032] Refer to the appendix Figure 3 , a sealing sleeve 23 is sleeved on the end of the half shaft 2, and a sealing ring 231 is arranged between the sealing sleeve 23 and the end of the half shaft 2. A first mounting portion 12 is arranged on the outer peripheral surface of the casing 1, and a second mounting portion 31 is arranged on the outer peripheral surface of the oil seal end cover 3. The casing 1 and the oil seal end cover 3 are connected by bolts between the first mounting portion 12 and the second mounting portion 31.

[0033] A first annular notch 11 is arranged on the inner peripheral surface of the casing 1, a second annular notch 21 is arranged on the outer peripheral surface of the half shaft 2, and a bearing 22 is arranged between the casing 1 and the half shaft 2. One side of the bearing 22 abuts against the first annular notch 11 and the second annular notch 21, and the other side of the bearing 22 abuts against the side wall of the sealing sleeve 23 to realize the rotational installation between the casing 1 and the half shaft 2.

[0034] Refer to the appendix Figure 4 , the first oil seal 4 includes a first skeleton 41, a first rubber body 42 wrapped around the first skeleton 41, and a first elastic member 43 sleeved on the circumference of the first rubber body 42. The first rubber body 42 forms a first lip 421 and a second lip 422, and the first lip 421 and the second lip 422 abut against the outer ring of the sealing sleeve 23.

[0035] The second oil seal 5 is a cartridge oil seal, with a compact structure design, small size, convenient for installation, and can also achieve a better sealing effect. Refer to the appendix Figure 4, the second oil seal 5 includes a second skeleton 51 and a third skeleton 54 with a symmetric cross-section distribution. The outer ring of the second skeleton 51 abuts against the inner wall of the casing 1. A second rubber body 52 is arranged in the inner ring of the second skeleton 51. The second rubber body 52 extends along the side surface of the second skeleton 51 to the inner ring of the second skeleton 51, and a second elastic member 53 is arranged in the circumferential direction of the second rubber body 52. The inner ring of the second rubber body 52 forms a third lip 521 and a fourth lip 522, and the third lip 521 and the fourth lip 522 abut against the outer ring of the third skeleton 54. A third rubber body 55 is arranged in the inner ring of the third skeleton 54. The inner ring of the third rubber body 55 abuts against the half shaft 2 and extends along the side surface of the third skeleton 54 to the outer ring of the third skeleton 54. The second rubber body 52 forms a fifth lip 551 and a sixth lip 552, and the fifth lip 551 and the sixth lip 552 abut against the inner ring of the second skeleton 51. In this embodiment, for the "inner ring" involved in the annular structure, it is the side close to the seal sleeve 23 with the body as the boundary, and the "outer ring" refers to the side close to the casing 1 with the body as the boundary.

[0036] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations of the present invention falling within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A half-shaft sealing structure of a transmission case, characterized in that, Comprising: A half shaft, which is connected to the transmission shaft inside the transmission case and can transmit the power in the transmission case to the outside of the transmission case; A sleeve, one end of which is connected to the housing of the transmission case and is sleeved outside the half shaft; An oil seal end cover, which is arranged at the end of the sleeve far from the transmission case, and a receiving space is formed between the oil seal end cover and the half shaft; A first oil seal, which is arranged at one end of the receiving space far from the sleeve; A second oil seal, which is arranged at one end of the receiving space close to the sleeve, and a predetermined gap is left between the first oil seal and the second oil seal; An oil filling joint, which is arranged on the oil seal end cover and is communicated with the predetermined gap formed between the first oil seal and the second oil seal.

2. The half-shaft sealing structure of the transmission case according to claim 1, characterized in that, A sealing sleeve is sleeved on the end of the half shaft, and a sealing ring is arranged between the sealing sleeve and the end of the half shaft.

3. The half-shaft sealing structure of the transmission case according to claim 2, characterized in that, A first mounting portion is arranged on the outer peripheral surface of the sleeve, and a second mounting portion is arranged on the outer peripheral surface of the oil seal end cover. The sleeve and the oil seal end cover are connected by bolts between the first mounting portion and the second mounting portion.

4. The half shaft sealing structure of the transmission case according to claim 3, wherein, A first annular notch is arranged on the inner peripheral surface of the sleeve, and a second annular notch is arranged on the outer peripheral surface of the half shaft. A bearing is arranged between the sleeve and the half shaft. One side of the bearing abuts against the first annular notch and the second annular notch, and the other side of the bearing abuts against the side wall of the sealing sleeve.

5. The half-shaft sealing structure of the transmission case according to claim 4, characterized in that, The first oil seal includes a first skeleton, a first rubber body wrapped around the first skeleton, and a first elastic member sleeved on the circumference of the first rubber body. The first rubber body forms a first lip and a second lip, and the first lip and the second lip abut against the outer ring of the sealing sleeve.

6. The half shaft sealing structure of the transmission case according to claim 5, characterized in that, The second oil seal is a cartridge oil seal.

7. The half shaft seal structure of the gearbox according to claim 6, characterized in that, The second oil seal includes a second skeleton and a third skeleton with a symmetric cross-section. The outer ring of the second skeleton abuts against the inner wall of the sleeve. A second rubber body is arranged inside the second skeleton. The second rubber body extends along the side surface of the second skeleton to the inner ring of the second skeleton, and a second elastic member is arranged on the circumference of the second rubber body. The inner ring of the second rubber body forms a third lip and a fourth lip, and the third lip and the fourth lip abut against the outer ring of the third skeleton. A third rubber body is arranged inside the third skeleton. The inner ring of the third rubber body abuts against the half shaft and extends along the side surface of the third skeleton to the outer ring of the third skeleton. The second rubber body forms a fifth lip and a sixth lip, and the fifth lip and the sixth lip abut against the inner ring of the second skeleton.

8. The half-shaft sealing structure of the transmission case according to claim 1, characterized in that, The end of the half shaft is also connected with a driving wheel through a spline.

9. The half-shaft sealing structure of the transmission case according to claim 1, characterized in that The oil filling joint further includes an oil filling cup, and the oil filling cup is connected with the oil filling joint and partially placed inside the oil filling joint.

10. An agricultural machine, characterized in that, Including the transmission case half shaft sealing structure according to any one of claims 1 to 9.

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