Sealed type agricultural machinery transmission shaft universal joint assembly

Abstract

The utility model discloses a sealing type agricultural machinery transmission shaft universal joint assembly which comprises a cross shaft body, shaft necks and shaft sleeves, the shaft necks and the cross shaft body are integrally formed, the shaft sleeves are movably connected to the four shaft necks in a sleeved mode respectively, rolling needles are arranged on the outer walls of the tops of the shaft necks, and a first step and a second step are arranged at the bottoms of the shaft necks. The bottom surface of the dustproof cover is in contact with the top surface of the second step; the sealing ring is fixed on the top surface of the dustproof cover; the sealing ring comprises an outer lip, an inner lip and a protrusion, the outer lip makes flexible contact with the outer wall of the shaft sleeve to form sealing, the inner lip makes flexible contact with the inner wall of the shaft sleeve and the side wall of the first step to form sealing, and the protrusion is located between the outer lip and the inner lip and makes flexible contact with the bottom face of the shaft sleeve to form sealing. The universal joint has the technical advantages of being small in machining difficulty, low in manufacturing cost and high in assembling efficiency, the sealing effect of the universal joint is improved, and the service life of the universal joint is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission shaft universal joints, in particular to a sealed agricultural machinery transmission shaft universal joint assembly. Background Art

[0002] Most of the commonly used agricultural machinery needs to be powered by a tractor. Usually, one end of the agricultural machinery transmission shaft is connected to the power output shaft of the tractor, and the other end is connected to the transmission shaft of agricultural machinery such as rotary tillers, ridgers, and field return machines. The agricultural machinery transmission shaft drives the rotary tillers, ridgers, and field return machines to rotate for field operations. In this process, a universal joint is needed to achieve power transmission. The universal joint is usually installed between the tractor power output shaft and the agricultural machinery power input shaft.

[0003] There is a gap between the shaft sleeve and the shaft neck of the existing agricultural machinery transmission shaft universal joint when in use, and the sealing performance is poor. When performing agricultural operations, dust and muddy water in the field can easily enter the bearing, which has a great impact on the performance and service life of the cross-axis universal joint. The utility model patent with application number 202320851571.0 discloses a highly sealed cross-axis universal joint assembly, including a cross-axis body, a universal shaft neck and a universal shaft sleeve, the universal shaft neck and the cross-axis body are integrally formed, the universal shaft sleeve is movably connected to one end of the universal shaft neck, the outer side of the cross-axis body is provided with a fastening plate, the inner side of the fastening plate is fixedly connected to a sealing gasket, one side of the sealing gasket is in close contact with the universal shaft sleeve, one end of the fastening plate is fixedly connected to a connecting column, the outer side of the cross-axis body is fixedly connected to a fastening mechanism, the fastening mechanism includes a fastening box, and the inner side of the fastening box is slidably connected to a sliding plate.

[0004] Although the above patent can solve the problems of poor sealing performance between the shaft sleeve and the shaft neck of the transmission shaft universal joint and easy dust absorption, the utility model has a complex structure, increased assembly cost of the fastening mechanism, low assembly efficiency, and difficult processing of the fastening mechanism, and high manufacturing cost.

[0005] Therefore, it is necessary to develop a sealed agricultural machinery transmission shaft universal joint assembly in view of the above-mentioned defects. Utility Model Content

[0006] The utility model aims to provide a sealed agricultural machinery transmission shaft universal joint assembly, which has the technical characteristics of low processing difficulty, low production cost and high assembly efficiency, and can also improve the sealing effect of the universal joint and extend the service life of the universal joint.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] The utility model discloses a sealed universal joint assembly of a transmission shaft of agricultural machinery, comprising a universal joint fork, a cross shaft body, a shaft neck and a shaft sleeve, wherein the shaft neck and the cross shaft body are integrally formed, and the shaft sleeve is movably sleeved on four shaft necks respectively and the shaft neck is installed in the shaft hole of the universal joint fork, and is characterized in that: it also includes a needle roller, a sealing ring and a dust cover, a plurality of needle rollers are evenly distributed circumferentially between the shaft neck and the shaft sleeve, and a first step and a second step are sequentially arranged at the bottom of the shaft neck; the dust cover is sleeved on the shaft neck and the bottom surface contacts the top surface of the second step, and the sealing ring is fixed on the inner bottom surface of the dust cover; the sealing ring comprises an outer lip edge, an inner lip edge and a protrusion, the outer lip edge flexibly contacts with the outer wall of the shaft sleeve to form a seal, the inner lip edge flexibly contacts with the inner wall of the shaft sleeve and the side wall of the first step respectively to form a seal, and the protrusion is located between the outer lip edge and the inner lip edge and flexibly contacts with the bottom surface of the shaft sleeve to form a seal.

[0009] Furthermore, a first frame is arranged on the top surface of the dust cover, a second frame is arranged on the side wall of the first step, and the bottom of the sealing ring and the side close to the first step are respectively inserted into the first frame and the second frame.

[0010] Furthermore, an oil storage groove is provided between the outer lip, the inner lip and the protrusion.

[0011] Furthermore, the top of the dust cover is sleeved outside the shaft sleeve, and a lip is provided on the top of the dust cover, and the lip is gap-matched with the side wall of the shaft sleeve.

[0012] Furthermore, the sealing ring is made of nitrile rubber or fluororubber.

[0013] Furthermore, an oil filling hole is provided on the cross shaft body, and the oil filling hole is connected with a cross-shaped oil channel in the cross shaft body, and the oil channel guides the lubricating grease into the rolling cavity of the needle roller.

[0014] Compared with the prior art, the beneficial technical effects of the utility model are:

[0015] The utility model provides a dust cover and a sealing ring, wherein the dust cover is placed on the second step and sleeved on the shaft neck and the shaft sleeve, and the sealing ring is fixed on the top surface of the dust cover, and the outer lip edge, the inner lip edge and the protrusion of the sealing ring are in flexible contact with the shaft sleeve to form a seal, thereby preventing the gap between the shaft sleeve and the shaft neck from absorbing dust, improving the sealing effect of the universal joint, and extending the service life of the universal joint. At the same time, the sealing ring and the dust cover have low processing difficulty, low production cost, and high assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 for Figure 1 A partial enlarged view of part A;

[0019] Figure 3 It is a schematic structural diagram of the dust cover of the utility model.

[0020] Explanation of the reference numerals in the accompanying drawings: 1. cross shaft body; 2. journal; 201. first step; 202. second step; 3. bushing; 4. needle roller; 5. sealing ring; 501. outer lip; 502. inner lip; 503. protrusion; 504. oil storage tank; 505. first frame; 506. second frame; 6. dust cover; 601. lip; 7. oil filling hole. DETAILED DESCRIPTION

[0021] The core of the utility model is to provide a sealed agricultural machinery transmission shaft universal joint assembly, which has the technical characteristics of low processing difficulty, low production cost and high assembly efficiency, and can also improve the sealing effect of the universal joint and extend the service life of the universal joint.

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] With reference to the accompanying drawings, Figure 1 It is a schematic diagram of the structure of the utility model; Figure 2 for Figure 1 A partial enlarged view of part A; Figure 3 It is a schematic structural diagram of the dust cover of the utility model.

[0025] In a specific embodiment, Figure 1 and Figure 2As shown, a sealed agricultural machinery transmission shaft universal joint assembly includes a universal joint fork, a cross shaft body 1, a journal 2 and a sleeve 3, the journal and the cross shaft body 1 are integrally formed, the sleeve 3 is movably sleeved on four journals 2 and the journal 2 is installed in the universal joint fork shaft hole, characterized in that it also includes a needle roller 4, a sealing ring 5 and a dust cover 6, a plurality of needle rollers 4 are evenly distributed between the journal 2 and the sleeve 3, and the bottom of the journal 2 is sequentially provided with a first step 201 and a second step 202; the dust cover 6 is sleeved on the journal 2 and its bottom surface contacts the top surface of the second step 202, and the sealing ring 5 is fixed on the inner bottom surface of the dust cover 6; the sealing ring 5 includes an outer lip 501, an inner lip 502 and a protrusion 503, the outer lip 501 flexibly contacts the outer wall of the sleeve 3 to form a seal, the inner lip 502 flexibly contacts the inner wall of the sleeve 3 and the side wall of the first step 201 to form a seal, and the protrusion 503 is located between the outer lip 501 and the inner lip 502 and flexibly contacts the bottom surface of the sleeve 3 to form a seal.

[0026] By providing the dust cover 6 and the sealing ring 5, the dust cover 6 is placed on the second step 202 and sleeved on the shaft neck 2 and the shaft sleeve 3, and the sealing ring 5 is fixed on the top surface of the dust cover 6. The outer lip 501, the inner lip 502 and the protrusion 503 of the sealing ring are in flexible contact with the shaft sleeve 3 to form a seal, which can prevent the gap between the shaft sleeve 3 and the shaft neck 2 from absorbing dust, improve the sealing effect of the universal joint, and extend the service life of the universal joint. At the same time, the sealing ring 5 and the dust cover 6 have low processing difficulty, low production cost and high assembly efficiency.

[0027] In a specific embodiment, a first frame 505 is provided on the top surface of the dust cover 6, a second frame 506 is provided on the side wall of the first step 201, and the bottom of the sealing ring 5 and the side close to the first step 201 are respectively inserted into the first frame 505 and the second frame 506.

[0028] By setting a first skeleton 505 on the top surface of the dust cover 6 and a second skeleton 506 on the side wall of the first step 201, when installing the sealing ring 5, the bottom and side wall of the sealing ring 5 are respectively inserted into the first skeleton 505 and the second skeleton 506, so as to improve the overall strength of the sealing ring 5 and the connection relationship with the dust cover 6 and the shaft neck 2, so that it is not easy to age and deform, and the service life is extended.

[0029] In a specific implementation, an oil storage groove 504 is provided between the outer lip 501 , the inner lip 502 and the protrusion 503 .

[0030] The oil storage tank 504 can be provided to store grease temporarily, and can also avoid dry friction between the sleeve 3 and the outer lip 501, inner lip 502 and protrusion 503 of the sealing ring 5 during operation. The grease can reduce friction, prevent the sealing gasket from wearing out and becoming thinner for a long time, and increase the service life of the sealing gasket.

[0031] Specifically, the top of the dust cover 6 is sleeved outside the shaft sleeve 3 , and a lip 601 is provided on the top of the dust cover, and the lip 601 is gap-matched with the side wall of the shaft sleeve 3 .

[0032] The clearance between the side wall of the shaft sleeve 3 and the lip 601 of the dust cover 6 can prevent dust and dirt from directly entering the sealing ring 5 from the top of the dust cover 6, thereby affecting the operation of the shaft sleeve 3.

[0033] In a specific embodiment, the sealing ring 5 is made of nitrile rubber or fluororubber. Nitrile rubber and fluororubber have excellent oil resistance, can be excellent in oily media such as lubricating oil and fuel, and also have wear resistance, can maintain good sealing performance in a friction environment, and extend the service life.

[0034] In a specific embodiment, the cross shaft body 1 is provided with an oil filling hole 7 for adding grease to the universal shaft. The oil filling hole 7 is connected to a cross oil passage in the cross shaft body 1, and the oil passage guides the lubricating grease into the rolling cavity of the needle roller 4.

[0035] Working principle of the utility model: When assembling the utility model, the sealing ring 5 is first fixed on the top surface of the dust cover 6 through the first skeleton 505 on the top surface of the dust cover 6, and then the dust cover 6 is sleeved on the shaft neck 2, and the side wall of the sealing ring 5 is inserted into the second skeleton 506 on the side wall of the first step 201. Then the shaft neck 2 is installed in the hole of the universal joint fork by cooperating with the needle roller 4, and then the shaft sleeve 3 is inserted into the hole of the universal joint fork and sleeved on the shaft neck 2 of the cross shaft. In order to prevent the shaft sleeve 3 from axial movement, a clamping ring is installed on the top of the shaft sleeve 3 to limit it in the hole of the universal joint fork. At the same time, the outer wall, inner wall and bottom surface of the shaft sleeve 3 are flexibly contacted with the outer lip 501, the inner lip 502 and the protrusion 503 of the sealing ring 5 to form a seal, and the lip 601 on the top of the dust cover 6 cooperates with the clearance of the side wall of the shaft sleeve 3 to seal again. The sealing ring 5 and the dust cover 6 of the utility model have low processing difficulty, low manufacturing cost and high assembly efficiency. At the same time, the sealing effect of the universal joint is improved and the service life of the universal joint is extended.

[0036] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0037] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A sealed agricultural machinery transmission shaft universal joint assembly, comprising a universal joint fork, a cross shaft body (1), a journal (2) and a sleeve (3), wherein the journal and the cross shaft body (1) are integrally formed, and the sleeve (3) is movably sleeved on four journals (2) and the journal (2) is installed in the shaft hole of the universal joint fork, characterized in that: It also includes a needle roller (4), a sealing ring (5) and a dust cover (6), wherein a plurality of the needle rollers (4) are evenly distributed around the circumference between the shaft neck (2) and the shaft sleeve (3), and the bottom of the shaft neck (2) is provided with a first step (201) and a second step (202) in sequence; the dust cover (6) is sleeved on the shaft neck (2) and its bottom surface is in contact with the top surface of the second step (202), and the sealing ring (5) is fixed on the inner bottom surface of the dust cover (6); the sealing ring (5) comprises an outer lip (501), an inner lip (502) and a protrusion (503), wherein the outer lip (501) flexibly contacts the outer wall of the sleeve (3) to form a seal, the inner lip (502) flexibly contacts the inner wall of the sleeve (3) and the side wall of the first step (201) to form a seal, and the protrusion (503) is located between the outer lip (501) and the inner lip (502) and flexibly contacts the bottom surface of the sleeve (3) to form a seal.

2. The sealed agricultural machinery transmission shaft universal joint assembly according to claim 1, characterized in that: A first frame (505) is arranged on the top surface of the dust cover (6), a second frame (506) is arranged on the side wall of the first step (201), and the bottom of the sealing ring (5) and the side close to the first step (201) are respectively inserted into the first frame (505) and the second frame (506).

3. The sealed agricultural machinery transmission shaft universal joint assembly according to claim 1, characterized in that: An oil storage groove (504) is provided between the outer lip edge (501), the inner lip edge (502) and the protrusion (503).

4. The sealed agricultural machinery transmission shaft universal joint assembly according to claim 1, characterized in that: The top of the dust cover (6) is sleeved outside the shaft sleeve (3), and a lip (601) is provided at the top of the dust cover, and the lip (601) is gap-matched with the side wall of the shaft sleeve (3).

5. The sealed agricultural machinery transmission shaft universal joint assembly according to any one of claims 1 to 4, characterized in that: The sealing ring (5) is specifically made of nitrile rubber or fluororubber.

6. The sealed agricultural machinery transmission shaft universal joint assembly according to any one of claims 1 to 4, characterized in that: The cross shaft body (1) is provided with an oil filling hole (7), the oil filling hole (7) is connected to a cross-shaped oil passage in the cross shaft body (1), and the oil passage guides the lubricating grease into the rolling cavity of the needle roller (4).

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