Novel mechanical gearbox sealing structure

Abstract

The invention discloses a novel mechanical gearbox sealing structure, and relates to the technical field of sealing elements, the novel mechanical gearbox sealing structure comprises a protective cover and a transmission shaft, a double-lip oil seal and a limiting sleeve are installed between the transmission shaft and the protective cover from bottom to top, and the double-lip oil seal comprises an outer oil seal, an inner oil seal and a joint which are integrally formed; the outer oil seal and the inner oil seal are installed on the outer side of the joint from top to bottom, the joint is annular, a lubricating groove is formed in the inner wall of the joint, and the inner wall of the joint is slidably connected with the transmission shaft. The inner oil seal of the double-lip oil seal prevents oil leakage outwards, the outer oil seal internally prevents pollutants from entering, the outer anti-fouling lip and the inner anti-fouling lip are staggered to further prevent the pollutants from entering the outer oil seal to affect stretching and retracting of the first elastic part, the bearing spacer bush is lubricated by lubricating grease in the lubricating groove, aging of the double-lip oil seal under high-speed friction is delayed, and the service life is prolonged.

Description

Technical Field

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

[0002] The sealing of the gearbox is one of the important factors to ensure its normal operation and long life. The gearbox needs to be effectively sealed to prevent liquid leakage (such as gearbox oil, coolant, etc.) and to prevent external pollutants such as dust and moisture from entering the gearbox. The current gearbox seals are usually single-lip oil seals, and there is no lubrication between the transmission shaft. Single-lip seals cannot effectively ensure the effect of both oil leakage and dust prevention, and the friction between the bearing and the oil seal will accelerate the aging of the oil seal, which needs to be checked and replaced frequently, affecting normal use. Summary of the invention

[0003] In view of the problems mentioned in the background technology, an object of the present invention is to provide a new mechanical gearbox 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 novel mechanical gearbox sealing structure comprises a protective cover and a transmission shaft, wherein a double-lip oil seal and a limit sleeve are installed between the transmission shaft and the protective cover from bottom to top, wherein the double-lip oil seal comprises an outer oil seal, an inner oil seal and a connection formed integrally, wherein the outer oil seal and the inner oil seal are installed on the outside of the connection from top to bottom, wherein the connection is annular and a lubrication groove is provided on the inner wall of the connection, and the inner wall of the connection is slidably connected to the transmission 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 a preferred technical solution, the outer oil seal includes an outer frame and an outer lip edge, the outer frame is installed inside the outer lip edge, the outer lip edge includes an outer anti-fouling lip and an inner anti-fouling lip, the inner anti-fouling lip extends from the top of the connection point and hooks downward, the outer anti-fouling lip hooks inward from top to bottom, and the end of the outer anti-fouling lip extends higher than the inner anti-fouling lip and covers the inner anti-fouling lip.

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

[0009] As a preferred 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, the 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 is connected to 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 abutted against the plug hole.

[0011] As a preferred 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 a preferred technical solution, the closing assembly includes an oil baffle cover that is engaged on the oil tank mouth, and an elastic member 2 in a compressed state is installed between the oil baffle cover and the bottom of the oil tank. When the insert tube contacts the oil baffle cover, the deformation of the elastic member 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 disposed outside the transmission shaft, a groove for accommodating an O-ring is provided inside the bearing spacer, the O-ring is sleeved on the outside 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 pollutants from entering the inside. 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 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 given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional structural diagram of a novel 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 frame; 12. outer frame; 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. insertion hole; 4. lubrication assembly; 41. sponge pad; 42. oil guide pipe; 43. oil tank; 44. oil baffle cover; 45. insert; 46. connecting plate; 47. oil leakage hole; 48. elastic part two; 5. bearing spacer; 6. connecting flange; 7. transmission shaft; 8. O-ring. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] Example 1

[0023] refer to Figure 1 to Figure 2 A novel mechanical gearbox sealing structure described in this embodiment includes a protective cover 2 and a bearing spacer 5 fixedly sleeved on the outside of a transmission shaft 7, a connecting flange 6 is sleeved on the transmission shaft 7 above the bearing spacer 5, and the transmission shaft 7 is connected to the main reducer through the connecting flange 6. A groove for accommodating an O-ring 8 is opened in the bearing spacer 5, and 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 comprises an outer oil seal, an inner oil seal and a connection, which are integrally formed, and the outer oil seal and the inner oil seal are installed on the outer edge of the connection from top to bottom, and 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 containing lubricating grease. The inner wall of the connection is slidably connected to the outer wall of the bearing spacer 5. Two groups of elastic members 15 are sleeved on the outer edge of the connection. The two groups 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-fouling lip 131 and an inner anti-fouling lip 132. The inner anti-fouling lip 132 extends from the outer edge of the top of the connection and hooks downward and inward. The outer anti-fouling 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 comprises an inner frame 11 and an inner lip 14 . Both the inner frame 11 and the inner lip 14 are L-shaped, and the inner frame 11 is installed in the inner lip 14 .

[0031] During installation, install the O-ring 8 in the middle bearing spacer 5, then put the bearing spacer 5 on the transmission shaft 7, then embed the double-lip oil seal 1 between the bearing spacer 5 and the protective cover 2, 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 transmission shaft 7 above the bearing spacer 5.

[0032] When the transmission shaft 7 rotates, the bearing spacer 5 rotates with the transmission shaft 7. At this time, the lubricating grease in the lubrication groove 16 lubricates the bearing spacer 5, delaying the aging of the double-lip oil seal 1 under high-speed friction, and the elastic member 15 makes the double-lip oil seal 1 close to the bearing spacer 5. The inner oil seal of the double-lip oil seal 1 prevents oil leakage to the outside, and the outer oil seal prevents pollutants from entering the inside. The outer anti-pollution lip 131 and the inner anti-pollution lip 132 are staggered to further prevent pollutants from entering the outer oil seal and affecting the expansion and contraction of the elastic member 15.

[0033] Example 2

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

[0036] Preferably, the opening and closing assembly is installed on a connecting plate 46 on the inner wall of the oil guide pipe 42, a plug 45 is installed 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 groups 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 also includes an oil retaining cover 44 engaged on the opening of the oil tank 43 , and an 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 retaining cover 44 upward, the deformation of the elastic member 48 increases, and the oil retaining 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 by threads.

[0041] The grease in the lubrication groove 16 needs to be replaced in time after it is used up. In order to avoid frequent disassembly of the limit sleeve 3 to replace and install the grease, a lubrication assembly 4 is specially provided. During assembly, the oil guide pipe 42 on the double-lip oil seal 1 is abutted against the limit sleeve 3, and the insert pipe 45 is inserted into the insertion hole 31, and then the oil tank 43 is inverted. At this time, the oil retaining cover 44 closes the oil tank 43 under the push of the elastic member 48. During the process of screwing the oil tank 43 into the insertion hole 31, the insert pipe 45 pushes the oil retaining cover 44 to separate from the oil tank 43, so that the lubricating oil falls into the oil guide pipe 42 from between the oil retaining cover 44 and the inner wall of the oil tank 43, and then falls into the sponge pad 41 from 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 indicate orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope 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) comprises an outer oil seal, an inner oil seal and a connection part which are integrally formed. The outer oil seal and the inner oil seal are installed on the outer side of the connection part from top to bottom. The connection part is annular and a lubrication groove (16) is provided on the inner wall of the connection part. The inner wall of the connection part is slidably connected to the transmission shaft (7).

2. The novel mechanical gearbox 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 new mechanical gearbox sealing structure according to claim 1 is characterized in that: The outer oil seal comprises an outer frame (12) and an outer lip (13), wherein the outer frame (12) is installed inside 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).

4. The new mechanical gearbox sealing structure according to claim 1 is characterized in that: The inner oil seal comprises an inner frame (11) and an inner lip edge (14), wherein the inner frame (11) is installed inside the inner lip edge (14).

5. The novel mechanical gearbox sealing structure according to claim 1 is characterized in that: A flow guide component and an oil tank (43) are mounted on the double-lip oil seal (1); an insertion hole (31) is formed on the limit sleeve (3); the oil tank (43) is detachably mounted on the insertion hole (31); an opening component is mounted on the flow guide component; a closing component is mounted on the oil tank (43); when the punching component and the closing component are in contact, the flow guide component communicates with the lubrication groove (16) and the oil tank (43).

6. The novel mechanical gearbox sealing structure according to claim 5 is characterized in that: The flow guide assembly comprises 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 plug hole (31).

7. The novel mechanical gearbox sealing structure according to claim 6 is characterized in that: The opening assembly comprises a connecting plate (46) mounted on the inner wall of the oil guide pipe (42), a plug pipe (45) is mounted on the top of the connecting plate (46), the top of the plug pipe (45) is higher than the top of the limit plate (3), and a plurality of groups of oil leakage holes (47) are provided on the connecting plate (46) between the plug pipe (45) and the oil guide pipe (42).

8. The novel mechanical gearbox sealing structure according to claim 7 is characterized in that: The closing assembly comprises 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).

9. The novel mechanical gearbox sealing structure according to claim 6 is characterized in that: 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 transmission shaft (7).

10. The novel mechanical gearbox sealing structure according to claim 1 is characterized in that: A bearing spacer (5) is provided on the outer sleeve of the transmission shaft (7), a groove 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 with the bearing spacer (5).

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