A new sealing structure for mechanical gearbox

Abstract

The present invention discloses a novel mechanical gearbox sealing structure, which relates to the technical field of sealing components, including a protective cover and a transmission shaft. A double-lip oil seal and a limit sleeve are installed between the transmission shaft and the protective cover from bottom to top. The double-lip oil seal includes an outer oil seal, an inner oil seal and a connection formed in one piece. The outer oil seal and the inner oil seal are installed on the outside of the connection from top to bottom. The connection is annular and a lubrication groove is provided on the inner wall of the connection. The inner wall of the connection is slidably connected to the transmission shaft. The inner oil seal of the double-lip oil seal prevents oil leakage outward, and the outer oil seal prevents pollutants from entering inward. The outer anti-pollution lip and the inner anti-pollution lip are staggered to further prevent pollutants from entering the outer oil seal and affecting the expansion and contraction of the elastic member. The lubricating grease in the lubrication groove lubricates the bearing spacer, delays the aging of the double-lip oil seal under high-speed friction, and extends its service life.

Description

Technical Field

[0001] The invention belongs to the technical field of seals, and in particular relates to a novel sealing structure for a mechanical gearbox. Background Art

[0002] Gearbox sealing is a crucial factor in ensuring proper operation and longevity. Gearboxes require effective sealing to prevent the leakage of fluids (such as transmission oil and coolant) and to prevent the ingress of external contaminants such as dust and moisture. Current gearbox seals are typically single-lip oil seals, lacking lubrication between the transmission shaft and the transmission. Single-lip seals cannot effectively prevent both oil leakage and dust, and friction between the bearing and the oil seal accelerates seal aging, necessitating frequent inspection and replacement, impacting normal operation. Summary of the Invention

[0003] In view of the problems mentioned in the background technology, the purpose of the present invention is to provide a new mechanical transmission sealing structure to solve the problems mentioned in the background technology.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A new mechanical transmission sealing structure includes a protective cover and a drive shaft. A double-lip oil seal and a limit sleeve are installed between the drive shaft and the protective cover from bottom to top. The double-lip oil seal includes an integrally formed outer oil seal, an inner oil seal and a connection. The outer oil seal and the inner oil seal are installed on the outside of the connection from top to bottom. The connection is annular and a lubrication groove is provided on the inner wall of the connection. The inner wall of the connection is slidably connected to the drive shaft.

[0006] As a preferred technical solution, two groups of elastic members that shrink toward the axis are sleeved on the outer edge of the connection, and the two groups of elastic members are respectively installed in the outer oil seal and the inner oil seal.

[0007] As an optimal technical solution, the outer oil seal includes an outer frame and an outer lip. The outer frame is installed inside the outer lip. The outer lip includes an outer anti-pollution lip and an inner anti-pollution lip. The inner anti-pollution lip extends from the top of the connection and hooks downward and inward. The outer anti-pollution lip hooks inward from the top. The end of the outer anti-pollution lip extends higher than the inner anti-pollution lip and covers the inner anti-pollution lip.

[0008] As a preferred technical solution, the inner oil seal includes an inner skeleton and an inner lip, and the inner skeleton is installed inside the inner lip.

[0009] As an optimal technical solution, a guide assembly and an oil tank are installed on the double-lip oil seal, an insertion hole is opened on the limit sleeve, an oil tank is detachably installed on the insertion hole, an opening assembly is installed on the guide assembly, and a closing assembly is installed on the oil tank. When the punching assembly and the closing assembly are in contact, the guide assembly connects the lubrication groove and the oil tank.

[0010] As a preferred technical solution, the flow guide assembly includes an oil guide pipe, the bottom end of the oil guide pipe is connected to the lubrication groove, and the top end of the oil guide pipe is in contact with the plug hole.

[0011] As an optimal technical solution, the opening component includes a connecting plate installed on the inner wall of the oil guide pipe, a plug is installed on the top of the connecting plate, the top of the plug is higher than the top of the limit plate, and multiple groups of oil leakage holes are opened on the connecting plate between the plug and the oil guide pipe.

[0012] As an optimal technical solution, the closing assembly includes an oil baffle cover that is engaged on the oil tank mouth, and an elastic part 2 in a compressed state is installed between the oil baffle cover and the bottom of the oil tank. When the tube contacts the oil baffle cover, the deformation of the elastic part 2 increases, and the oil baffle cover is separated from the inner wall of the oil tank.

[0013] As an optimal technical solution, a sponge pad is installed in the lubrication groove, the bottom end of the oil guide pipe abuts against the sponge pad, and the sponge pad is slidably connected to the transmission shaft.

[0014] As an optimal technical solution, a bearing spacer is provided on the outer sleeve of the transmission shaft, and a groove for accommodating an O-ring is opened in the bearing spacer. The O-ring is sleeved on the outer side of the transmission shaft, and the inner wall of the connection is slidably connected to the bearing spacer.

[0015] Beneficial effects

[0016] The inner oil seal of the double-lip oil seal prevents oil leakage, and the outer oil seal prevents contaminants from entering the inside. The outer anti-contamination lip and the inner anti-contamination lip are staggered to further prevent contaminants from entering the outer oil seal and affecting the expansion and contraction of the elastic part. The grease in the lubrication groove lubricates the bearing spacer, delays the aging of the double-lip oil seal under high-speed friction, and extends its service life.

[0017] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional structural diagram of a new mechanical gearbox sealing structure proposed by the present invention;

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0020] Figure numerals: 1. Double-lip oil seal; 11. Inner skeleton; 12. Outer skeleton; 13. Outer lip; 131. Outer anti-fouling lip; 132. Inner anti-fouling lip; 14. Inner lip; 15. Elastic part one; 16. Lubrication groove; 2. Protective cover; 3. Limit sleeve; 31. Insert hole; 4. Lubrication assembly; 41. Sponge pad; 42. Oil guide pipe; 43. Oil tank; 44. Oil baffle cover; 45. Insert pipe; 46. Connecting plate; 47. Oil leakage hole; 48. Elastic part two; 5. Bearing spacer; 6. Connecting flange; 7. Drive shaft; 8. O-ring. DETAILED DESCRIPTION

[0021] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention, and are not to be construed as limiting the present invention.

[0022] Example 1

[0023] refer to Figures 1 to 2 The novel mechanical transmission sealing structure described in this embodiment includes a protective cover 2 and a bearing spacer 5 fixedly mounted on the outside of a transmission shaft 7. A connecting flange 6 is sleeved on the transmission shaft 7 above the bearing spacer 5. The transmission shaft 7 is connected to the final reducer through the connecting flange 6. A groove for accommodating an O-ring 8 is formed in the bearing spacer 5. The O-ring 8 is sleeved on the outside of the transmission shaft 7. The bearing spacer 5 is installed at the top opening of the protective cover 2.

[0024] A double-lip oil seal 1 and a limit sleeve 3 are installed between the bearing spacer 5 and the inner wall of the protective cover 2. The outer wall of the double-lip oil seal 1 is close to the inner wall of the protective cover 2. The limit sleeve 3 is embedded in the protective cover 2 at the top of the double-lip oil seal 1 to fix the double-lip oil seal 1. The inner wall of the double-lip oil seal 1 and the inner wall of the limit sleeve 3 are both slidably connected to the outer wall of the bearing spacer 5.

[0025] The double-lip oil seal 1 includes an outer oil seal, an inner oil seal and a connection. The outer oil seal, the inner oil seal and the connection are formed in one piece. The outer oil seal and the inner oil seal are installed on the outer edge of the connection from top to bottom. The inner wall of the connection is slidably connected to the bearing spacer.

[0026] The connection is annular and the inner wall of the connection is provided with a lubrication groove 16 for accommodating lubricating grease. The inner wall of the connection is slidably connected to the outer wall of the bearing spacer 5. Two sets of elastic members 15 are sleeved on the outer edge of the connection. The two sets of elastic members 15 are respectively installed in the outer oil seal and the inner oil seal, and the elastic member 15 shrinks toward the axis.

[0027] Preferably, the elastic member 15 is a compression spring with a tail connection, and the compression spring is sleeved on the outside of the connection.

[0028] The outer oil seal includes an outer frame 12 and an outer lip 13. The outer frame 12 is L-shaped and installed inside the outer lip 13. The outer lip 13 includes an outer anti-pollution lip 131 and an inner anti-pollution lip 132. The inner anti-pollution lip 132 extends from the outer edge of the top of the connection and hooks downward and inward. The outer anti-pollution lip 131 is U-shaped and hooks inward from the top.

[0029] Preferably, a distal end of the outer anti-fouling lip 131 extends higher than the inner anti-fouling lip 132 and covers the inner anti-fouling lip 132 .

[0030] The inner oil seal includes an inner skeleton 11 and an inner lip 14 . Both the inner skeleton 11 and the inner lip 14 are L-shaped, and the inner skeleton 11 is installed in the inner lip 14 .

[0031] During installation, install the O-ring 8 into the bearing spacer 5, then put the bearing spacer 5 on the drive shaft 7, then embed the double-lip oil seal 1 between the bearing spacer 5 and the protective cover 2, and then embed the limit sleeve 3 into the bearing spacer 5 and the protective cover 2 to fix the double-lip oil seal 1, and finally install the connecting flange on the drive shaft 7 above the bearing spacer 5.

[0032] When the transmission shaft 7 rotates, the bearing spacer 5 rotates with it. The grease in the lubrication groove 16 lubricates the bearing spacer 5, slowing down the aging of the double-lip oil seal 1 under high-speed friction. The elastic member 15 holds the double-lip oil seal 1 in close contact with the bearing spacer 5. The inner oil seal of the double-lip oil seal 1 prevents oil leakage, while the outer oil seal prevents contaminants from entering. The staggered outer anti-contamination lip 131 and inner anti-contamination lip 132 further prevent contaminants from entering the outer oil seal and affecting the expansion and contraction of the elastic member 15.

[0033] Example 2

[0034] refer to Figures 1 to 2 In the novel mechanical transmission sealing structure described in this embodiment, preferably, a lubrication assembly 4 is installed on the double-lip oil seal 1, an insertion hole 31 is opened on the limiting sleeve 3, and the lubrication assembly 4 includes a guide assembly, an oil tank 43 and an opening and closing assembly. The oil tank 43 is detachably inserted into the insertion hole 31, the guide assembly is installed on the connection of the double-lip oil seal 1, and the opening and closing assembly is installed between the guide assembly and the oil tank 43.

[0035] Preferably, the flow guide assembly includes an oil guide pipe 42 , the bottom end of the oil guide pipe 42 is communicated with the lubrication groove 16 , and the top end of the oil guide pipe 42 abuts against the insertion hole 31 .

[0036] Preferably, the opening and closing assembly is mounted on a connecting plate 46 on the inner wall of the oil guide pipe 42, a plug 45 is mounted on the top of the connecting plate 46, the top of the plug 45 is higher than the top of the limit plate 3, the diameter of the plug 45 is smaller than the inner diameter of the oil guide pipe 42, and a plurality of oil leakage holes 47 are provided on the connecting plate 46 between the plug 45 and the oil guide pipe 42.

[0037] The opening and closing assembly further includes an oil retaining cover 44 engaged on the opening of the oil tank 43 , and a second elastic member 48 in a compressed state is installed between the oil retaining cover 44 and the bottom of the oil tank 43 .

[0038] During assembly, the insert 45 pushes the oil baffle cover 44 upward, the deformation of the elastic member 48 increases, and the oil baffle cover 44 is separated from the inner wall of the oil tank 43.

[0039] Preferably, a sponge pad 41 is installed in the lubrication groove 16 , the bottom end of the oil guide pipe 42 abuts against the sponge pad 41 , and the sponge pad 41 is slidably connected to the bearing spacer 5 .

[0040] Preferably, the opening of the oil tank 43 is connected to the insertion hole 31 via threads.

[0041] The grease in the lubrication groove 16 needs to be replaced promptly after it is used up. To avoid frequent disassembly of the limit sleeve 3 for replacement and installation of grease, a lubrication assembly 4 is provided. During assembly, the oil guide tube 42 on the double-lip oil seal 1 is brought into contact with the limit sleeve 3, and the insert 45 is inserted into the insertion hole 31. The oil tank 43 is then inverted. At this time, the oil retaining cap 44, pushed by the second elastic member 48, closes the oil tank 43. As the oil tank 43 is screwed into the insertion hole 31, the insert 45 pushes the oil retaining cap 44 away from the oil tank 43, allowing the lubricating oil to fall from between the oil retaining cap 44 and the inner wall of the oil tank 43 into the oil guide tube 42, and then into the sponge pad 41 through the oil leakage hole 47. The oil-soaked sponge pad 41 lubricates the bearing spacer 5.

[0042] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0044] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0046] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A novel mechanical gearbox sealing structure, comprising a protective cover (2) and a transmission shaft (7), characterized in that: A double-lip oil seal (1) and a limit sleeve (3) are installed between the transmission shaft (7) and the protective cover (2) from bottom to top. The double-lip oil seal (1) includes an outer oil seal, an inner oil seal and a connection formed in one piece. The outer oil seal and the inner oil seal are installed on the outside of the connection from top to bottom. The connection is annular and a lubrication groove (16) is provided on the inner wall of the connection. The inner wall of the connection is slidably connected to the transmission shaft (7). The root outer oil seal comprises an outer frame (12) and an outer lip (13), wherein the outer frame (12) is installed in the outer lip (13), and the outer lip (13) comprises an outer anti-fouling lip (131) and an inner anti-fouling lip (132), wherein the inner anti-fouling lip (132) extends from the top of the connection part and hooks inward downward, and the outer anti-fouling lip (131) hooks inward from the top, and the end of the outer anti-fouling lip (131) extends higher than the inner anti-fouling lip (132) and covers the inner anti-fouling lip (132); The inner oil seal comprises an inner frame (11) and an inner lip (14), wherein the inner frame (11) is installed in the inner lip (14); A flow guide assembly and an oil tank (43) are installed on the double-lip oil seal (1); an insertion hole (31) is opened on the limit sleeve (3); the oil tank (43) is detachably installed on the insertion hole (31); an opening assembly is installed on the flow guide assembly; a closing assembly is installed on the oil tank (43); when the punching assembly and the closing assembly are in contact, the flow guide assembly communicates with the lubrication groove (16) and the oil tank (43); The flow guide assembly includes an oil guide pipe (42), the bottom end of the oil guide pipe (42) is communicated with the lubrication groove (16), and the top end of the oil guide pipe (42) is in contact with the insertion hole (31); The opening assembly includes a connecting plate (46) mounted on the inner wall of the oil guide pipe (42), a plug (45) is mounted on the top of the connecting plate (46), the top of the plug (45) is higher than the top of the limiting sleeve (3), and a plurality of oil leakage holes (47) are provided on the connecting plate (46) between the plug (45) and the oil guide pipe (42); The closing assembly includes an oil baffle cover (44) engaged on the opening of the oil tank (43), and a second elastic member (48) in a compressed state is installed between the oil baffle cover (44) and the bottom of the oil tank (43). When the insertion tube (45) contacts the oil baffle cover (44), the deformation of the second elastic member (48) increases, and the oil baffle cover (44) is separated from the inner wall of the oil tank (43).

2. The novel mechanical transmission sealing structure according to claim 1 is characterized in that: Two groups of elastic members (15) that shrink toward the axis are sleeved on the outer edge of the connection, and the two groups of elastic members (15) are respectively installed in the outer oil seal and the inner oil seal.

3. The novel mechanical transmission sealing structure according to claim 1 is characterized in that: A sponge pad (41) is installed in the lubrication groove (16), the bottom end of the oil guide pipe (42) is in contact with the sponge pad (41), and the sponge pad (41) is slidably connected to the transmission shaft (7).

4. The novel mechanical transmission sealing structure according to claim 1 is characterized in that: A bearing spacer (5) is provided on the outer cover of the transmission shaft (7), a slot for accommodating an O-ring (8) is provided in the bearing spacer (5), the O-ring (8) is sleeved on the outer side of the transmission shaft (7), and the inner wall of the connection is slidably connected to the bearing spacer (5).

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