Gear box input end sealing device

Abstract

The utility model discloses a gearbox input end sealing device, which relates to the technical field of gearboxes and comprises a box body, and a bearing is arranged in the box body. The shaft seal end cover is connected with the box body and provided with a through hole allowing the input shaft to penetrate through, a plurality of annular oil storage grooves are formed in the inner wall of the through hole, and an annular mounting groove is formed in the inner wall of the end, away from the bearing, of the through hole. The inner side oil seal part and the outer side oil seal part are symmetrically installed in the annular installation groove, an annular spacer ring is arranged between the inner side oil seal part and the outer side oil seal part, and an annular oil absorption felt is arranged on the side, facing the input shaft, of the annular spacer ring. And the end cover baffle is detachably connected with the shaft seal end cover, and the end cover baffle is used for blocking the outer side oil seal piece. According to the gearbox input end sealing device, the technical problem that lubricating oil leaks in an existing sealing device is solved, and the technical effects that an effective sealing barrier is formed between the input shaft and the box body, lubricating oil leakage and external impurity invasion are prevented, and then the service life is prolonged are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gear boxes, in particular to a sealing device for an input end of a gear box. Background Art

[0002] In the ship power transmission system, the gearbox is a key component, and its sealing performance directly affects the safe operation and fuel efficiency of the entire ship. In particular, the sealing design of the gearbox input end is crucial to prevent lubricating oil leakage, maintain the system lubrication state and reduce environmental pollution. At present, the lip seal is widely used as an effective sealing method, but there are some significant problems in practical applications:

[0003] Unstable sealing effect: Lip seals are designed to prevent the leakage of lubricating oil overflowing from rotating bearings. However, in actual operation, due to the combined effects of various factors such as high-speed rotation of the shaft, temperature fluctuations, vibrations and changes in medium pressure, the sealing effect is often difficult to maintain stable.

[0004] Therefore, how to provide a gearbox input end sealing device to improve the sealing reliability and extend the service life is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0005] The utility model aims to provide a gear box input end sealing device, which solves the technical problem of lubricating oil leakage in the existing sealing device.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a gearbox input end sealing device, comprising:

[0007] A box body, wherein a bearing is arranged in the box body;

[0008] A shaft seal end cover, the shaft seal end cover is connected to the housing, the shaft seal end cover is provided with a through hole for the input shaft to pass through, one end of the input shaft is connected to the input flange, the inner wall of the through hole is provided with a plurality of annular oil storage grooves, and the inner wall of one end of the through hole away from the bearing is provided with an annular mounting groove;

[0009] An inner oil seal and an outer oil seal of the same structure, the inner oil seal and the outer oil seal are symmetrically installed in the annular installation groove, an annular spacer is provided between the inner oil seal and the outer oil seal, and an annular oil absorption felt is provided on the side of the annular spacer facing the input shaft;

[0010] An end cover baffle is detachably connected to the shaft seal end cover, and the end cover baffle is used to seal the outer oil seal.

[0011] Preferably, the outer oil seal comprises a lip seal body, a first mounting groove and a second mounting groove are provided on one end surface of the lip seal body, a V-shaped piece for fitting into the inner wall of the annular mounting groove is provided on the outer side of the lip seal body, the inner side of the lip seal body is used for fitting into the outer peripheral surface of the input shaft, the first mounting groove is used for installing a support frame, and the second mounting groove is used for installing an annular clamping piece.

[0012] Preferably, a splitting cutout is provided on the supporting frame.

[0013] Preferably, the cross-sectional shape of the annular oil storage groove is any one of a sawtooth shape, a rectangle and an arc shape.

[0014] Preferably, the annular pressing member is an annular elastic member.

[0015] Preferably, an oil-swinging chamber is provided on one end surface of the shaft seal end cover facing the bearing, a channel connected to the input shaft is provided on one end of the oil-swinging chamber facing the input shaft, and an oil return groove connected to the oil return hole of the housing is provided on the end of the oil-swinging chamber away from the input shaft.

[0016] Preferably, the shaft seal end cover and the input shaft are clearance-fitted.

[0017] Preferably, a sealing gasket is further included, and the sealing gasket is arranged between the shaft seal end cover and the casing.

[0018] Compared with the above background technology, the annular oil storage groove provided by the utility model is arranged closer to the bearing than the annular mounting groove, and plays a role in storing the lubricating oil entering the shaft seal end cover, preventing excessive lubricating oil from entering the annular mounting groove. The inner oil seal and the outer oil seal have the same structure but complementary functions, and are symmetrically installed in the annular mounting groove. The inner oil seal prevents the lubricating oil from leaking outward, and the outer oil seal plays a role in dust and water prevention. The annular spacer is installed between the inner oil seal and the outer oil seal. The annular oil absorption felt arranged on the annular spacer can absorb and store excess lubricating oil, further preventing oil leakage. In summary, the gearbox input end sealing device provided by the present application realizes the formation of an effective sealing barrier between the input shaft and the housing, preventing the leakage of lubricating oil and the intrusion of external impurities, thereby extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1A main cross-sectional view of a gearbox input end sealing device provided by an embodiment of the utility model;

[0021] Figure 2 for Figure 1 Middle A is a partial enlarged schematic diagram;

[0022] Figure 3 for Figure 1 Middle B is a partial enlarged schematic diagram;

[0023] Figure 4 A schematic diagram of the structure of the inner oil seal provided by an embodiment of the utility model;

[0024] Figure 5 This is a schematic diagram of the support skeleton structure provided by an embodiment of the utility model.

[0025] in:

[0026] 1-housing, 2-bearing, 3-shaft seal end cover, 4-input shaft, 5-input flange, 6-inner oil seal, 7-outer oil seal, 8-annular spacer ring, 9-end cover baffle;

[0027] 11-Oil return hole;

[0028] 31- annular oil storage groove, 32- annular mounting groove, 33- oil throwing chamber, 34- oil return groove;

[0029] 71-V-shaped member, 72-support frame, 721-split cutout, 73-annular pressing member;

[0030] 81-Annular oil absorbent felt. DETAILED DESCRIPTION

[0031] 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.

[0032] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] See also Figure 1-Figure 3The present application provides a gearbox input end sealing device, comprising a housing 1, in which a bearing 2 is arranged; a shaft seal end cover 3, which is connected to the housing 1, and is provided with a through hole for an input shaft 4 to pass through, one end of the input shaft 4 is connected to an input flange 5, and the inner wall of the through hole is provided with a plurality of annular oil storage grooves 31, and the inner wall of the through hole at one end away from the bearing 2 is provided with an annular mounting groove 32; an inner oil seal 6 and an outer oil seal 7 of the same structure, the inner oil seal and the outer oil seal are symmetrically installed in the annular mounting groove 32, an annular spacer ring 8 is provided between the inner oil seal and the outer oil seal, and an annular oil absorption felt 81 is provided on the side of the annular spacer ring 8 facing the input shaft 4; an end cover baffle 9, which is detachably connected to the shaft seal end cover 3, and the end cover baffle 9 is used to seal the outer oil seal 7.

[0034] That is to say, the bearing 2 is installed in the housing 1 to support and position the input shaft 4 to ensure the stability of the input shaft 4 during rotation. The shaft seal end cover 3 is tightly connected to the housing 1 to form a part of the sealing interface. The through hole opened in the shaft seal end cover 3 allows the input shaft 4 to pass through.

[0035] The annular mounting groove 32 is located at one end of the through hole away from the bearing 2, and is used to install the inner oil seal 6 and the outer oil seal 7 to ensure that the two can fit tightly on the input shaft 4 to form an effective sealing barrier; the inner oil seal 6 and the outer oil seal 7 have the same structure but complementary functions, and are symmetrically installed in the annular mounting groove. The inner oil seal 6 prevents the lubricating oil from leaking to the outside, and the outer oil seal 7 prevents dust and water.

[0036] The annular oil storage groove 31 is arranged closer to the bearing 2 than the annular installation groove 32 , and plays a storage role for the lubricating oil entering the shaft seal end cover 3 , thereby preventing excessive lubricating oil from entering the annular installation groove 32 .

[0037] The annular spacer ring 8 is installed between the inner oil seal 6 and the outer oil seal 7. The annular oil-absorbing felt 81 arranged on the annular spacer ring 8 can absorb and store excess lubricating oil to further prevent oil leakage.

[0038] The end cover baffle 9 is detachably connected to the shaft seal end cover 3 and is used to seal the outer oil seal 7 to form a complete sealing system.

[0039] In summary, the gearbox input end sealing device provided in the present application realizes the formation of an effective sealing barrier between the input shaft and the housing, thereby preventing the leakage of lubricating oil and the intrusion of external impurities, thereby extending the service life.

[0040] Based on the above embodiments, see Figure 2 and Figure 3The outer oil seal 7 includes a lip seal body, and a first mounting groove and a second mounting groove are provided on one end surface of the lip seal body. A V-shaped piece 71 is provided on the outer side of the lip seal body for fitting the inner wall of the annular mounting groove 32. The inner side of the lip seal body is used to fit the outer circumferential surface of the input shaft 4. The first mounting groove is used to install the support frame 72, and the second mounting groove is used to install the annular clamping piece 73.

[0041] That is to say, the lip seal body has wear resistance and high temperature resistance, and the inner side of the lip seal body can fit tightly on the input shaft to form an effective sealing interface.

[0042] The V-shaped member 71 is located outside the lip seal body and can fit tightly against the inner wall of the annular installation groove 32 during installation. The V-shaped member 71 and the lip seal body are integrated.

[0043] The first mounting groove is used to mount the support frame 72. The support frame 72 provides additional support and rigidity for the lip seal body.

[0044] The second mounting groove is used to mount the annular pressing member 73. The annular pressing member is usually made of elastic material, and its function is to further compress the contact surface between the V-shaped member 71 and the input shaft 4 to enhance the sealing effect.

[0045] During installation, the lips of the inner oil seal 6 and the outer oil seal 7 are arranged in opposite directions. Specifically, the lip of the inner oil seal 6 is arranged toward the bearing 2, and the lip of the outer oil seal 7 is arranged away from the bearing 2, ensuring double sealing to prevent both leakage of lubricating oil and entry of foreign matter.

[0046] Based on the above embodiments, see Figure 5 The support frame 72 is provided with a split cutout 721, and the annular clamping piece 73 and the lip seal body are both provided with split cutouts. That is to say, the split cutout of the annular clamping piece 73 is provided to facilitate installation of the annular clamping piece in the second installation groove, the split cutout 721 of the support frame 72 is provided to facilitate installation of the support frame 72 in the first installation groove, and the split cutout of the lip seal body is provided to facilitate installation of the lip seal body in the annular installation groove 32. During installation, grease is applied to the journal of the input shaft 4 and the sealing lip to facilitate installation.

[0047] During the installation process, the support frame 72 is first installed in the first installation groove of the lip seal body, and then the annular pressing member 73 is installed in the second installation groove of the lip seal body to form the inner oil seal 6 and the outer oil seal 7. Then, the inner oil seal 6, the outer oil seal 7, the annular spacer ring 8 and the annular oil absorption felt 81 are correspondingly installed in the annular installation groove 32.

[0048] When the input shaft 4 rotates, the inner side of the lip seal body is closely fitted with the outer peripheral surface of the input shaft 4, and the V-shaped member 71 is closely fitted on the inner wall of the annular mounting groove 32, and cooperates with the lip seal body to ensure good sealing performance.

[0049] On the basis of the above embodiment, the cross-sectional shape of the annular oil storage groove 31 is any one of a sawtooth shape, a rectangle and an arc shape, and the shaft seal end cover 3 and the input shaft 4 are gap-matched.

[0050] That is to say, the cross-sectional shape of the annular oil storage groove 31 can be one of a sawtooth shape, a rectangle or an arc shape. The characteristics of different shapes are as follows:

[0051] The serrated shape can better capture and store lubricant droplets, helping to reduce lubricant loss.

[0052] Rectangular shape provides a larger storage space, and the preferred shape in this application is rectangular.

[0053] Arc shape reduces turbulence of lubricating oil.

[0054] The shaft seal end cover 3 and the input shaft 4 are clearance-fitted, which can reduce the friction between the shaft seal end cover 3 and the input shaft 4 and help reduce energy loss.

[0055] On the basis of the above-mentioned embodiment, an oil-slinging chamber 33 is provided on the end face of the shaft seal end cover 3 facing the bearing 2, an end of the oil-slinging chamber 33 facing the input shaft 4 is provided with a channel connected to the input shaft 4, and an end of the oil-slinging chamber 33 facing away from the input shaft 4 is provided with an oil return groove 34 connected to the oil return hole 11 of the housing 1. That is to say, the sealing device at the input end of the gearbox of the present application is to seal the lubricating oil for lubricating the bearing 2.

[0056] Specifically, an oil-slinging chamber 33 is provided on one end face of the shaft seal end cover 3 facing the bearing 2, which is used to collect and process the lubricating oil brought up by the high-speed rotation of the input shaft 4. The oil-slinging chamber 33 is provided with a channel connected to the input shaft 4 at one end facing the input shaft 4, so that the lubricating oil brought up by the rotation of the input shaft can smoothly enter the oil-slinging chamber 33.

[0057] The end of the oil-slinging chamber 33 away from the input shaft 4 is provided with an oil return groove 34 connected to the oil return hole 11 of the housing 1. Most of the lubricating oil collected in the oil-slinging chamber 33 flows directly back to the housing 1 through the oil return groove 34 and the oil return hole 11, realizing the recycling of the lubricating oil.

[0058] Although most of the lubricating oil is collected and recycled by the oil-slinging chamber 33, a small part of the lubricating oil may still enter the annular mounting groove 32. At this time, the annular oil storage groove 31 can further absorb and store the remaining lubricating oil, thereby significantly reducing the amount of lubricating oil entering the annular mounting groove 32.

[0059] The annular oil storage groove 31 not only reduces the leakage of lubricating oil, but also provides additional lubrication support for the oil seal system through its oil storage function, which helps to extend the service life of the oil seal.

[0060] Even if a very small amount of lubricating oil passes through the inner oil seal 6, the annular oil-absorbing felt 81 can absorb the trace amount of lubricating oil as the last protection measure, thereby completely preventing the lubricating oil from leaking out.

[0061] A sealing gasket is also included, which is arranged between the shaft seal end cover 3 and the housing 1. That is, the sealing gasket is arranged between the shaft seal end cover 3 and the housing 1 to ensure that an effective seal can be formed during the connection. When the shaft seal end cover 3 is fastened to the housing 1, the sealing gasket will be compressed and fill any tiny gaps, thereby preventing leakage of the fluid.

[0062] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0063] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A gearbox input end sealing device, characterized in that: include: A box body (1), wherein a bearing (2) is arranged inside the box body (1); A shaft seal end cover (3), the shaft seal end cover (3) being connected to the housing (1), the shaft seal end cover (3) being provided with a through hole for the input shaft (4) to pass through, one end of the input shaft (4) being connected to the input flange (5), the inner wall of the through hole being provided with a plurality of annular oil storage grooves (31), and the inner wall of one end of the through hole away from the bearing (2) being provided with an annular mounting groove (32); an inner oil seal (6) and an outer oil seal (7) of identical structure, the inner oil seal and the outer oil seal being symmetrically mounted in the annular mounting groove (32), an annular spacer ring (8) being provided between the inner oil seal and the outer oil seal, and an annular oil absorbing felt (81) being provided on a side of the annular spacer ring (8) facing the input shaft (4); An end cover baffle (9) is detachably connected to the shaft seal end cover (3), and the end cover baffle (9) is used to seal the outer oil seal (7).

2. The gearbox input end sealing device according to claim 1, characterized in that: The outer oil seal (7) comprises a lip seal body, a first mounting groove and a second mounting groove are provided on one end surface of the lip seal body, a V-shaped piece (71) is provided on the outer side of the lip seal body for fitting against the inner wall of the annular mounting groove (32), the inner side of the lip seal body is used for fitting against the outer peripheral surface of the input shaft (4), the first mounting groove is used for installing a support frame (72), and the second mounting groove is used for installing an annular pressing piece (73).

3. The gearbox input end sealing device according to claim 2, characterized in that: The support frame (72) is provided with a splitting cutout (721).

4. The gearbox input end sealing device according to claim 2, characterized in that: The cross-sectional shape of the annular oil storage groove (31) is any one of a sawtooth shape, a rectangle and an arc shape.

5. The gearbox input end sealing device according to claim 2, characterized in that: The annular pressing member (73) is an annular elastic member.

6. The gearbox input end sealing device according to any one of claims 1 to 5, characterized in that: An oil-slinging chamber (33) is provided on an end surface of the shaft seal end cover (3) facing the bearing (2); an end of the oil-slinging chamber (33) facing the input shaft (4) is provided with a passage connected to the input shaft (4); and an end of the oil-slinging chamber (33) facing away from the input shaft (4) is provided with an oil return groove (34) connected to the oil return hole (11) of the housing (1).

7. The gearbox input end sealing device according to claim 6, characterized in that: The shaft seal end cover (3) and the input shaft (4) are clearance-fitted.

8. The gearbox input end sealing device according to claim 7, characterized in that: It also comprises a sealing gasket, which is arranged between the shaft sealing end cover (3) and the box body (1).

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