Bidirectional oil seal and its use method

Abstract

The present invention belongs to the technical field of engineering components, and specifically relates to seals, and in particular to bidirectional oil seals and methods of using the same. The present invention provides a bidirectional oil seal, comprising: an end cover; a sealing guide, which is arranged on the inner wall of the end cover and sleeved on the outer wall of the transmission shaft; a sealing strip, which is arranged on the inner wall of the sealing guide and is suitable for abutting against the outer wall of the transmission shaft; wherein, when the transmission shaft rotates to throw grease toward the inner wall of the sealing guide, the sealing guide is suitable for guiding the grease to flow in a direction away from the end cover; when the transmission radial shaft shakes, the sealing strip is squeezed, and the sealing strip is suitable for squeezing the sealing guide to deform so that the two ends of the sealing guide abut against the outer wall of the transmission shaft. Through the cooperation of the sealing guide and the sealing strip, when the grease on the outer wall of the transmission shaft is thrown toward the sealing guide, the grease can be guided to flow into the interior of the gear box, thereby preventing the grease from flowing outward through the gap between the transmission shaft and the end cover.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering components, and specifically relates to seals, and in particular to a bidirectional oil seal and a use method thereof. Background Art

[0002] In the use scenario of the gearbox of new energy, the drive shaft protrudes from the outer wall of the gear box. Since the drive shaft rotates relative to the gear box, it is necessary to prevent the grease in the gear box from overflowing along the outer wall of the drive shaft.

[0003] Traditional sealing devices usually set a sealing ring in the gap between the outer wall of the transmission shaft and the gear box to prevent the grease in the gear box from overflowing. However, the grease in the gear box moves along the transmission shaft to the side of the sealing ring close to the inside of the gear box, causing some of the grease to overflow. Moreover, the transmission shaft will shake during high-speed rotation. At this time, the traditional sealing ring structure cannot effectively seal the gap between the outer wall of the transmission shaft and the gear box.

[0004] Because how to solve the problem of grease leaking along the outer wall of the transmission shaft to the outside of the gear box during high-speed rotation of the transmission shaft is a technical problem that urgently needs to be solved in this field.

[0005] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0006] The embodiments of the present disclosure at least provide a bidirectional oil seal and a method for using the same.

[0007] In a first aspect, an embodiment of the present disclosure provides a bidirectional oil seal, comprising:

[0008] An end cover, which is arranged on a side wall of the gear box;

[0009] A sealing guide, which is arranged on the inner wall of the end cover and sleeved on the outer wall of the transmission shaft;

[0010] A sealing strip, which is arranged on the inner wall of the sealing guide and is suitable for abutting against the outer wall of the transmission shaft;

[0011] Wherein, when the transmission shaft rotates to throw the grease toward the inner wall of the sealing guide, the sealing guide is suitable for guiding the grease to flow in a direction away from the end cover;

[0012] When the transmission shaft shakes radially, the sealing strip is squeezed, and the sealing strip is suitable for squeezing the sealing guide to deform, so that the two ends of the sealing guide abut against the outer wall of the transmission shaft.

[0013] In an optional embodiment, the sealing guide is arc-shaped and elastic;

[0014] The sealing strip is arranged at the middle of the inner wall of the sealing guide;

[0015] The sealing strip is squeezed to move toward the sealing guide, and both ends of the inner wall of the sealing guide are suitable for moving toward the transmission shaft.

[0016] In an optional embodiment, a spiral groove is circumferentially formed on the inner wall of the sealing guide, and the spiral groove is suitable for guiding the grease to flow in a direction away from the end cover.

[0017] In an optional embodiment, the direction of the spiral groove is consistent with the rotation direction of the transmission shaft;

[0018] The starting point of the spiral groove is located on the inner wall of the sealing guide close to the sealing strip, and the ending point of the spiral groove is toward the end of the sealing guide away from the end cover.

[0019] In an optional embodiment, the sealing guide is provided with a receiving cavity near the sealing strip, and the receiving cavity is suitable for storing grease;

[0020] A plurality of oil outlet holes are provided on one side of the inner wall of the sealing guide close to the spiral groove, and the oil outlet holes are communicated with the accommodating cavity;

[0021] When the sealing strip is squeezed, the grease in the accommodating cavity is sprayed toward the outer wall of the transmission shaft through the oil outlet hole.

[0022] In an optional embodiment, a positioning ring is radially provided on the outer wall of the sealing guide, and the side wall of the positioning ring abuts against the inner wall of the end cover.

[0023] In an optional embodiment, a plurality of bosses are arranged at equal intervals on the inner wall of the end cover, and the bosses are suitable for limiting the positioning ring.

[0024] In an optional embodiment, an end cover is provided on a side wall of the gear box;

[0025] A sealing guide, which is arranged on the inner wall of the end cover and sleeved on the outer wall of the transmission shaft;

[0026] A sealing strip, which is arranged on the inner wall of the sealing guide and is suitable for abutting against the outer wall of the transmission shaft;

[0027] The sealing guide is in an arc shape and has elasticity;

[0028] The sealing strip is arranged at the middle of the inner wall of the sealing guide;

[0029] The inner wall of the sealing guide is provided with a spiral groove in the circumferential direction, and the spiral groove is suitable for guiding the grease to flow in a direction away from the end cover;

[0030] When the transmission shaft rotates to throw the grease toward the inner wall of the sealing guide, the spiral groove is suitable for guiding the grease to flow in a direction away from the end cover.

[0031] In an optional embodiment, the direction of the spiral groove is consistent with the rotation direction of the transmission shaft;

[0032] The starting point of the spiral groove is located on the inner wall of the sealing guide close to the sealing strip, and the ending point of the spiral groove is toward the end of the sealing guide away from the end cover.

[0033] In an optional embodiment, the sealing guide is provided with a receiving cavity near the sealing strip, and the receiving cavity is suitable for storing grease;

[0034] A plurality of oil outlet holes are provided on one side of the inner wall of the sealing guide close to the spiral groove, and the oil outlet holes are communicated with the accommodating cavity;

[0035] When the sealing strip is squeezed, the grease in the accommodating cavity is sprayed toward the outer wall of the transmission shaft through the oil outlet hole.

[0036] In an optional embodiment, a positioning ring is radially provided on the outer wall of the sealing guide, and the side wall of the positioning ring abuts against the inner wall of the end cover.

[0037] In a second aspect, the embodiment of the present disclosure further provides a method for using an oil seal, the method comprising:

[0038] When the transmission shaft rotates to throw the grease toward the inner wall of the sealing guide, the sealing guide is suitable for guiding the grease to flow in a direction away from the end cover;

[0039] When the transmission shaft shakes radially, the sealing strip is squeezed, and the sealing strip is suitable for squeezing the sealing guide to deform, so that the two ends of the sealing guide abut against the outer wall of the transmission shaft.

[0040] The beneficial effect of the present invention is that the bidirectional oil seal and the use method thereof of the present invention, through the cooperation of the sealing guide and the sealing strip, the spiral groove provided on the inner wall of the sealing guide can guide the grease thrown toward the inner wall of the sealing guide to move into the gear box, thereby avoiding the long-term accumulation of grease between the sealing guide and the transmission shaft; and when the radial shaking is caused by the high-speed rotation of the transmission shaft, the sealing strip is squeezed by the transmission shaft to move in the direction of the sealing guide, and the sealing strip squeezes the sealing guide so that the two ends of the sealing guide move toward the outer wall of the transmission shaft at the same time, and the two end walls of the sealing guide and the sealing strip abut against the outer wall of the transmission shaft at the same time, thereby further improving the sealing effect on the transmission shaft.

[0041] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, this article specifically cites preferred embodiments and provides detailed descriptions as follows in conjunction with the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A three-dimensional diagram of a bidirectional oil seal provided in an embodiment of the present disclosure;

[0045] Figure 2 A perspective view of a sealing guide provided for an embodiment of the present disclosure;

[0046] Figure 3 A cutaway perspective view of an end cap and a seal guide provided for an embodiment of the present disclosure;

[0047] Figure 4 A cross-sectional view of a sealing guide provided for an embodiment of the present disclosure;

[0048] Figure 5 A schematic diagram of the state of the sealing strip extruding the sealing guide provided in an embodiment of the present disclosure.

[0049] In the figure:

[0050] 1. End cover; 12. Boss; 2. Sealing guide; 20. Spiral groove; 21. Accommodating cavity; 22. Positioning ring; 3. Sealing strip. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In this article, when it is mentioned that the first component is located on the second component, this may mean that the first component may be directly formed on the second component, or the third component may be interposed between the first component and the second component. In addition, in the drawings, in order to effectively describe the technical content, the thickness of the components may be exaggerated or reduced.

[0053] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0054] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0055] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0056] Research has found the shortcomings of the prior art: traditional sealing devices often set a sealing ring in the gap between the outer wall of the transmission shaft and the gear box to prevent the grease in the gear box from overflowing outward. However, the grease in the gear box moves along the transmission shaft to the side of the sealing ring close to the inside of the gear box, causing some of the grease to overflow outward; moreover, the transmission shaft will shake during high-speed rotation. At this time, the traditional sealing ring structure cannot effectively seal the gap between the outer wall of the transmission shaft and the gear box.

[0057] Because how to solve the problem of grease leakage along the outer wall of the transmission shaft to the outside of the gear box is a technical problem that urgently needs to be solved in this field.

[0058] The defects existing in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present invention in this article for the above problems should be the contributions made by the inventor to the present invention during the disclosure process.

[0059] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0060] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0061] The bidirectional oil seal of this embodiment is used in the field of new energy vehicles, and is arranged in the gap between the outer wall of the transmission shaft and the gear box.

[0062] like Figures 1 to 5 As shown, some embodiments provide a bidirectional oil seal, including: an end cover 1, which is arranged on the side wall of the gear box; a through hole is opened in the middle of the end cover 1, and the transmission shaft of the gear box passes through the through hole. A sealing guide 2 is arranged on the inner side wall of the end cover 1 and sleeved on the outer wall of the transmission shaft; the sealing guide 2 is a PTFE wear-resistant material with added graphite material, which has a certain elasticity.

[0063] Reference Figure 3 , the sealing strip 3 is arranged on the inner wall of the sealing guide 2 and is suitable for abutting against the outer wall of the transmission shaft; the sealing strip 3 is made of wear-resistant material; wherein, during the rotation of the transmission shaft, the grease in the gear box will move along the outer wall of the transmission shaft toward the end cover 1. In the traditional sealing strip 3, the grease on the outer wall of the transmission shaft will be limited by the sealing strip 3, and will accumulate between the inner wall of the sealing strip 3 and the outer wall of the transmission shaft. With the long-term operation of the transmission shaft, there is a situation where the grease leaks outward through the gap between the transmission shaft and the sealing strip 3.

[0064] In this embodiment, when the transmission shaft rotates to throw the grease toward the inner wall of the sealing guide 2, the grease has a certain kinetic energy when it is thrown out, and the spiral groove 20 on the inner wall of the sealing guide 2 can guide the grease with kinetic energy to flow into the gear box again, thereby preventing the grease from accumulating in the gap between the inner wall of the sealing strip 3 and the transmission shaft. The sealing guide 2 is suitable for guiding the grease to flow away from the end cover 1; when the transmission shaft shakes radially, the sealing strip 3 is squeezed, and the sealing strip 3 is suitable for squeezing the sealing guide 2 to deform, so that the two ends of the sealing guide 2 abut against the outer wall of the transmission shaft.

[0065] Reference Figure 4 Through the cooperation of the sealing guide 2 and the sealing strip 3, the spiral groove 20 opened on the inner wall of the sealing guide 2 can guide the grease thrown to the inner wall of the sealing guide 2 to move into the gear box, thereby avoiding the long-term accumulation of grease between the sealing guide 2 and the transmission shaft; and when the radial shaking is caused by the high-speed rotation of the transmission shaft, the sealing strip 3 is squeezed by the transmission shaft to move in the direction of the sealing guide 2, and the sealing strip 3 squeezes the sealing guide 2 so that the two ends of the sealing guide 2 move toward the outer wall of the transmission shaft at the same time, and the two end walls of the sealing guide 2 and the sealing strip 3 are in contact with the outer wall of the transmission shaft at the same time, further improving the sealing effect of the transmission shaft.

[0066] Reference Figure 4 , the sealing guide 2 is arc-shaped and elastic; the sealing strip 3 is arranged in the middle of the inner wall of the sealing guide 2; when the transmission shaft is not rotating, the inner wall of the sealing strip 3 abuts against the outer wall of the transmission shaft, and a gap is provided between the two ends of the inner wall of the sealing guide 2 and the outer wall of the transmission shaft. Among them, when the transmission shaft rotates at a high speed, the transmission shaft will have a small radial shaking, and the radial shaking of the transmission shaft will squeeze the sealing strip 3, causing it to move in the direction of the sealing guide 2; the sealing strip 3 is squeezed to move in the direction of the sealing guide 2, and the sealing strip 3 squeezes the middle inner wall of the sealing guide 2, so that the two ends of the inner wall of the sealing guide 2 are deformed in the direction of the transmission shaft, and the two ends of the inner wall of the sealing guide 2 are suitable for moving in the direction of the transmission shaft; at this time, the two ends of the inner wall of the sealing guide 2 and the sealing strip 3 abut against the outer wall of the transmission shaft at the same time to form a multi-layer protection, which improves the sealing effect of the sealing guide 2 on the outer wall of the transmission shaft and avoids the grease on the outer wall of the transmission shaft from leaking to the outside of the end cover 1,

[0067] Reference Figure 5, a spiral groove 20 is provided on the inner wall of the sealing guide 2 in the circumferential direction, and the spiral groove 20 is suitable for guiding the grease to flow in the direction away from the end cover 1. The direction of the spiral groove 20 is consistent with the rotation direction of the transmission shaft; the starting point of the spiral groove 20 is located at the inner wall of the sealing guide 2 close to the sealing strip 3, and the end point of the spiral groove 20 is toward the end of the sealing guide 2 away from the end cover 1. The setting of the spiral groove 20 can guide the grease with kinetic energy to flow to the gear box when the transmission shaft rotates and throws the grease to the inner wall of the sealing guide 2, thereby preventing the grease from accumulating between the inner wall of the sealing strip 3 and the outer wall of the transmission shaft, and preventing the grease from leaking outward. When the sealing strip 3 is squeezed to move toward the inner wall of the sealing guide 2, the two ends of the sealing guide 2 are squeezed to deform in the direction of the transmission shaft. At this time, the spiral groove 20 is squeezed to be in an open state, and the opening size of the spiral groove 20 becomes larger. The opening of the spiral groove 20 is enlarged, which can accommodate more grease flowing in per unit time, avoiding the situation where the end point of the spiral groove 20 is squeezed and reduced when the end wall of the sealing guide 2 abuts against the transmission shaft. That is, after the inner end wall of the sealing guide 2 abuts against the transmission shaft, the end point of the spiral groove 20 will not be squeezed by the transmission shaft and the oil outlet will not be reduced, thereby ensuring that the oil outlet can still guide the grease to flow to the gear box.

[0068] Reference Figure 4 The sealing guide 2 is provided with a receiving chamber 21 near the sealing strip 3, and the receiving chamber 21 is suitable for storing grease; the grease is lubricating oil to reduce the friction between the sealing strip 3 and the transmission shaft. The inner wall of the sealing guide 2 is provided with a plurality of oil outlet holes on one side near the spiral groove 20, and the oil outlet holes are connected with the receiving chamber 21; when the sealing strip 3 is squeezed, the grease in the receiving chamber 21 is sprayed toward the outer wall of the transmission shaft through the oil outlet holes. The sealing strip 3 squeezes the receiving chamber 21 so that the grease in the receiving chamber 21 flows outward.

[0069] Reference Figure 2 The outer wall of the sealing guide 2 is provided with a positioning ring 22 in the radial direction, and the side wall of the positioning ring 22 abuts against the inner wall of the end cover 1. The positioning ring 22 is parallel to the inner wall of the end cover 1; the inner wall of the end cover 1 is provided with a plurality of bosses 12 at equal intervals, and the bosses 12 are suitable for limiting the positioning ring 22. The bosses 12 are "L"-shaped, and the bosses 12 are suitable for limiting the positioning ring 22 to improve the stability of the sealing guide 2 fixed to the side wall of the end cover 1.

[0070] Some embodiments provide a bidirectional oil seal, comprising: an end cover 1, which is arranged on the side wall of the gear box; a sealing guide 2, which is arranged on the inner wall of the end cover 1 and is sleeved on the outer wall of the transmission shaft; a sealing strip 3, which is arranged on the inner wall of the sealing guide 2 and is suitable for abutting against the outer wall of the transmission shaft; the sealing guide 2 is arc-shaped and elastic, and the sealing strip 3 is arranged in the middle of the inner wall of the sealing guide 2; a spiral groove 20 is circumferentially provided on the inner wall of the sealing guide 2, and the spiral groove 20 is suitable for guiding the grease to flow in a direction away from the end cover 1; wherein, when the transmission shaft rotates to throw the grease toward the inner wall of the sealing guide 2, the spiral groove 20 is suitable for guiding the grease to flow in a direction away from the end cover 1.

[0071] Reference Figure 2 The direction of the spiral groove 20 is consistent with the rotation direction of the transmission shaft; the starting point of the spiral groove 20 is located on the inner wall of the sealing guide 2 close to the sealing strip 3, and the end point of the spiral groove 20 is toward the end of the sealing guide 2 away from the end cover 1.

[0072] Reference Figure 4 The sealing guide 2 is provided with a receiving cavity 21 near the sealing strip 3, and the receiving cavity 21 is suitable for storing grease; a plurality of oil outlet holes are provided on the inner wall of the sealing guide 2 near the spiral groove 20, and the oil outlet holes are connected with the receiving cavity 21; wherein, when the sealing strip 3 is squeezed, the grease in the receiving cavity 21 is sprayed toward the outer wall of the transmission shaft through the oil outlet holes.

[0073] Reference Figure 4 A positioning ring 22 is radially arranged on the outer wall of the sealing guide 2 , and the side wall of the positioning ring 22 abuts against the inner wall of the end cover 1 .

[0074] Some embodiments provide a method for using an oil seal, the method comprising:

[0075] When the transmission shaft rotates to throw the grease toward the inner wall of the sealing guide 2, the sealing guide 2 is suitable for guiding the grease to flow in the direction away from the end cover 1; when the transmission shaft shakes radially, the sealing strip 3 is squeezed, and the sealing strip 3 is suitable for squeezing the sealing guide 2 to deform so that the two ends of the sealing guide 2 abut against the outer wall of the transmission shaft.

[0076] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used in this document unless explicitly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0078] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A bidirectional oil seal, characterized in that: include: An end cover (1) is arranged on a side wall of the gear box; A sealing guide (2), which is arranged on the inner wall of the end cover (1) and sleeved on the outer wall of the transmission shaft; A sealing strip (3) which is arranged on the inner wall of the sealing guide (2) and is suitable for abutting against the outer wall of the transmission shaft; When the transmission shaft rotates to throw the grease toward the inner wall of the sealing guide (2), the sealing guide (2) is suitable for guiding the grease to flow in a direction away from the end cover (1); When the transmission shaft shakes radially, the sealing strip (3) is squeezed, and the sealing strip (3) is suitable for squeezing the sealing guide (2) to deform, so that the two ends of the sealing guide (2) abut against the outer wall of the transmission shaft; The sealing guide (2) is arc-shaped and elastic; The sealing strip (3) is arranged at the middle of the inner wall of the sealing guide (2); The sealing strip (3) is squeezed to move in the direction of the sealing guide (2), and both ends of the inner wall of the sealing guide (2) are suitable for moving in the direction of the transmission shaft; A spiral groove (20) is provided on the inner wall of the sealing guide (2) in the circumferential direction, and the spiral groove (20) is suitable for guiding the grease to flow in a direction away from the end cover (1); The direction of the spiral groove (20) is consistent with the rotation direction of the transmission shaft; The starting point of the spiral groove (20) is located on the inner wall of the sealing guide (2) close to the sealing strip (3), and the end point of the spiral groove (20) is toward an end of the sealing guide (2) away from the end cover (1); The sealing guide (2) is provided with a receiving cavity (21) near the sealing strip (3), and the receiving cavity (21) is suitable for storing grease; A plurality of oil outlet holes are provided on a side of the inner wall of the sealing guide (2) close to the spiral groove (20), and the oil outlet holes are in communication with the accommodating cavity (21); When the sealing strip (3) is squeezed, the grease in the accommodating cavity (21) is sprayed toward the outer wall of the transmission shaft through the oil outlet hole.

2. The bidirectional oil seal according to claim 1, characterized in that: A positioning ring (22) is radially arranged on the outer wall of the sealing guide (2), and the side wall of the positioning ring (22) abuts against the inner wall of the end cover (1).

3. The bidirectional oil seal according to claim 2, characterized in that: The inner wall of the end cover (1) is provided with a plurality of bosses (12) at equal intervals, and the bosses (12) are suitable for limiting the positioning ring (22).

4. A method for using an oil seal, characterized in that: Using the bidirectional oil seal according to any one of claims 1 to 3, the method of using the seal comprises: When the transmission shaft rotates to throw the grease toward the inner wall of the sealing guide (2), the sealing guide (2) is suitable for guiding the grease to flow in a direction away from the end cover (1); When the transmission shaft shakes radially, the sealing strip (3) is squeezed, and the sealing strip (3) is suitable for squeezing the sealing guide (2) to deform, so that the two ends of the sealing guide (2) abut against the outer wall of the transmission shaft.

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