A double sealing structure for reducer

Abstract

The invention discloses a double sealing structure of a reducer, comprising: a housing, a rotating shaft, a transparent cover, an oil seal, a spacer and a bearing; the transparent cover, the oil seal, the spacer and the bearing are sequentially sleeved on the rotating shaft, the transparent cover is connected to the housing, and the oil seal is located in the transparent cover; the housing is provided with a first oil inlet hole and a first oil return hole along the axial direction of the rotating shaft, and the transparent cover is provided with an oil collecting groove and an oil return groove; the spacer and the bearing are accommodated in the housing, a retaining ring is provided inside the spacer, and the spacer is provided with a radial second oil inlet hole and a second oil return hole on the side of the retaining ring facing the bearing; the oil collecting groove is respectively connected to the first oil inlet hole and the second oil inlet hole, and the oil return groove is respectively connected to the first oil return hole and the second oil return hole. This structure can effectively prevent oil leakage.

Description

Technical Field

[0001] The invention relates to the technical field of reducer sealing, and in particular to a double sealing structure of a reducer. Background Art

[0002] In general reducers, the seals for the inlet and outlet shafts include mechanical seals and oil seals. The oil seal is widely used in reducers. In general designs, the inside of the oil seal is in direct contact with the lubricating oil. When the equipment is running, a large amount of lubricating oil is injected between the oil seal and the bearing through the lubrication system. Driven by the operation of the shaft, the lubricating oil continuously impacts and accumulates on the lip of the oil seal, posing a risk of oil leakage. Moreover, as time goes by, the oil seal will age, and oil leakage will occur at this time. Summary of the invention

[0003] In view of the above problems existing in the prior art, an object is to provide a double sealing structure for a reducer which can effectively prevent oil leakage.

[0004] The specific technical solutions are as follows:

[0005] A double sealing structure of a reducer mainly comprises: a housing, a rotating shaft, a transparent cover, an oil seal, a spacer and a bearing;

[0006] The transparent cover, the oil seal, the spacer and the bearing are sequentially sleeved on the rotating shaft, the transparent cover is connected to the box body, and the oil seal is located inside the transparent cover;

[0007] The box body is provided with a first oil inlet hole and a first oil return hole along the axial direction of the rotating shaft, and the transparent cover is provided with an oil collecting groove and an oil return groove;

[0008] The spacer and the bearing are accommodated in the housing, a retaining ring is arranged inside the spacer, and the spacer is provided with a radial second oil inlet hole and a second oil return hole on a side of the retaining ring facing the bearing;

[0009] The oil collecting groove is communicated with the first oil inlet hole and the second oil inlet hole respectively, and the oil return groove is communicated with the first oil return hole and the second oil return hole respectively.

[0010] The above-mentioned double sealing structure of a reducer also has such a feature that the spacer includes a first ring and a second ring with different diameters, the first ring with a larger diameter abuts against the bearing, and the second ring with a smaller diameter partially extends into and abuts against the transparent cover, and the outer diameter of the second ring is adapted to the inner hole of the transparent cover on the one hand, and on the other hand, a gap is left with the inner wall of the box to form a first channel and a second channel, the first channel is respectively connected to the oil collecting tank and the second oil inlet hole, and the second channel is respectively connected to the oil return tank and the second channel.

[0011] The above-mentioned double sealing structure of the reducer also has the following feature: the second oil inlet hole is arranged on the first ring, and a first notch is arranged on the first ring corresponding to the second oil inlet hole.

[0012] The above-mentioned double sealing structure of the reducer also has the following characteristics: an oil storage bracket protruding from the inner wall of the spacer is provided in the spacer, and the oil storage bracket is provided with the second oil return hole, and the second oil return hole passes through the oil storage bracket and the spacer.

[0013] The above-mentioned double sealing structure of the reducer also has the feature that the spacer is provided with a second notch at a position corresponding to the second oil return hole.

[0014] The above-mentioned double sealing structure of the reducer also has the following characteristics: the spacer is also provided with a third oil return hole, and the third oil return hole is arranged on the retaining ring. The radial height of the third oil return hole is smaller than the radial height of the second oil return hole, and the radial height is the distance from the third oil return hole or the second oil return hole to the center line of the rotating shaft in the vertical direction. The spacer is also provided with a third notch on the side of the retaining ring facing the transparent cover.

[0015] The above-mentioned double sealing structure of the reducer also has the feature that the number of the third oil return holes is two.

[0016] The above-mentioned double sealing structure of a reducer also has such a feature that the transparent cover includes a stepped hole, and the stepped hole includes a first hole, a second hole and a third hole with successively increasing diameters, wherein the first hole is far away from the spacer, and the third hole is close to the spacer, the first hole cooperates with the rotating shaft, the oil seal is accommodated in the second hole, and the spacer rests on the step surface formed by the second hole and the third hole.

[0017] The above-mentioned double sealing structure of the reducer also has the feature that the first ring of the spacer abuts against the outer ring of the bearing.

[0018] The above-mentioned double sealing structure of the reducer also has the feature that the second ring of the spacer abuts against the step surface.

[0019] The positive effects of the above technical solution are:

[0020] The present invention provides a double sealing structure for a reducer, which has a new type of spacer. The spacer is provided with a second oil inlet hole connected to the oil collecting groove of the transparent cover, and a second oil return hole connected to the oil return groove of the transparent cover, so that the lubricating oil flows into the oil collecting groove of the transparent cover through the casing and then flows into the interior of the spacer. In addition, the spacer is provided with a retaining ring. The retaining ring allows the lubricating oil to remain on the side of the bearing so that the bearing is fully lubricated. At the same time, the retaining ring blocks the lubricating oil from flowing to the oil seal to effectively prevent oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a double sealing structure of a reducer provided in an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of a transparent cover provided in an embodiment of the present invention;

[0023] Figure 3 yes Figure 2 A schematic cross-sectional structural diagram of the transparent cover along the AA direction;

[0024] Figure 4 is a schematic structural diagram of a spacer provided in a first direction according to an embodiment of the present invention;

[0025] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of the spacer along the BB direction;

[0026] Figure 6 is a schematic structural diagram of a spacer in a second direction provided by an embodiment of the present invention;

[0027] Figure 7 is a schematic diagram of a three-dimensional structure of a spacer provided in an embodiment of the present invention in one direction;

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the spacer provided by an embodiment of the present invention in another direction.

[0029] In the accompanying drawings: 1. casing; 11. first oil inlet hole; 12. first oil return hole; 13. bearing hole; 2. rotating shaft; 3. transparent cover; 31. mounting hole; 32. stepped hole; 321. first hole; 322. second hole; 323. third hole; 33. oil collecting groove; 335. first channel; 336. second channel; 34. oil return groove; 35. stop end face; 4. oil seal; 5. spacer; 51. first ring; 52. second ring; 53. retaining ring; 54. second oil inlet hole; 55. second oil return hole; 56. first notch; 57. second notch; 58. third oil return hole; 59. third notch; 6. bearing; 61. inner ring; 62. outer ring; 7. oil storage bracket. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying 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 to the present invention.

[0032] 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.

[0033] See also Figures 1 to 3 , Figure 1 is a structural schematic diagram of a double sealing structure of a reducer provided in an embodiment of the present invention; Figure 2 is a schematic structural diagram of a transparent cover provided in an embodiment of the present invention; Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure of the transparent cover along the AA direction.

[0034] The double sealing structure of the reducer in this embodiment includes a housing 1 , a rotating shaft 2 , a transparent cover 3 , an oil seal 4 , a spacer ring 5 and a bearing 6 .

[0035] Specifically, the transparent cover 3 , the oil seal 4 , the spacer 5 and the bearing 6 are sequentially sleeved on the rotating shaft 2 .

[0036] One end of the rotating shaft 2 is located in the box body 1 , and the other end extends out of the box body 1 . The transparent cover 3 is sleeved on the end of the rotating shaft 2 extending out of the box body 1 , and is connected to the side surface of the box body 1 .

[0037] The transparent cover 3 is connected to the box body 1 .

[0038] Optionally, the transparent cover 3 is provided with a mounting hole 31, and the box body 1 is provided with a fixing hole (not shown) matching with the mounting hole 31; the transparent cover 3 and the box body 1 are fixedly connected by a fastener (not shown).

[0039] The oil seal 4 is located inside the transparent cover 3 .

[0040] Specifically, the outer part of the transparent cover 3 in this embodiment is a stepped structure, and the inner part includes a stepped hole 32, and the stepped hole 32 includes a first hole 321, a second hole 322 and a third hole 323 with successively increasing diameters, wherein the first hole 321 is far away from the spacer ring 5, and the third hole 323 is close to the spacer ring 5, and the first hole 321 cooperates with the rotating shaft 2.

[0041] The oil seal 4 is accommodated in the second hole 322 . Specifically, an end surface of the oil seal 4 abuts against a step surface formed by the first hole 321 and the second hole 322 .

[0042] The spacer ring 5 abuts against the step surface formed by the second hole 322 and the third hole 323 .

[0043] Specifically, a portion of the spacer ring 5 extends into the third hole 323 , and the end extending into the third hole 323 is the first end. The end surface of the first end of the spacer ring 5 abuts against the step surface formed by the second hole 322 and the third hole 323 .

[0044] The first end of the spacer ring 5 is matched with the inner hole of the transparent cover 3 .

[0045] Specifically, the inner hole of the transparent cover 3 here is the third hole 323 of the transparent cover 3 , and the inner diameter of the third hole 323 is matched with the outer diameter of the first end of the spacer 5 .

[0046] See also Figures 4 to 6 , Figure 4 is a schematic structural diagram of a spacer provided in a first direction according to an embodiment of the present invention; Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of the spacer along the BB direction; Figure 6 is a schematic structural diagram of a spacer in a second direction provided by an embodiment of the present invention; Figure 7 is a schematic diagram of a three-dimensional structure of a spacer provided in an embodiment of the present invention in one direction; Figure 8 It is a schematic diagram of the three-dimensional structure of the spacer provided by an embodiment of the present invention in another direction.

[0047] Furthermore, in this embodiment, the spacer 5 includes a first ring 51 and a second ring 52 with different diameters. Figure 1 As shown, the first ring 51 with a larger diameter abuts against the bearing 6 , and the second ring 52 with a smaller diameter partially extends into and abuts against the transparent cover 3 .

[0048] In this embodiment, the second ring 52 of the spacer 5 is the first end of the spacer 5, and the first ring 51 of the spacer 5 is the second end.

[0049] Specifically, the first ring 51 abuts against the outer ring 62 of the bearing 6 , and the inner ring 61 of the bearing is axially positioned by a step surface provided on the rotating shaft 2 .

[0050] The second ring 52 of the spacer 5 partially extends into the third hole 323, and the end face of the second ring 52 of the spacer 5 abuts against the step surface formed by the second hole 322 and the third hole 323 to achieve axial positioning of the spacer 5. The protruding end face of the third hole 323 is also called the stop end face 35 of the transparent cover 3. The stop end face 35 of the transparent cover 3 does not contact the end face of the first end of the spacer 5, but leaves a small gap.

[0051] Specifically, the inner diameter of the third hole 323 matches the outer diameter of the second ring 52 .

[0052] like Figure 1 and Figure 3 As shown, the transparent cover 3 is provided with an oil collecting groove 33 and an oil return groove 34 .

[0053] Specifically, the oil collecting groove 33 and the oil returning groove 34 are respectively disposed on opposite sides of the third hole 323 and are communicated with the third hole 323 .

[0054] Preferably, in this embodiment, the oil collecting groove 33 and the oil return groove 34 are arranged in a vertical direction, so as to adapt to the flow law of the lubricating oil from high to low.

[0055] The housing 1 in this embodiment is provided with a first oil inlet hole 11 and a first oil return hole 12 along the axial direction of the rotating shaft 2 . The first oil inlet hole 11 is connected to the oil collecting groove 33 of the transparent cover 3 , and the first oil return hole 12 is connected to the oil return groove 34 of the transparent cover 3 .

[0056] A gap is left between the second ring 52 and the inner wall of the housing 1 to form a first channel 335 and a second channel 336 . The first channel 335 is connected to the oil collecting groove 33 , and the second channel 336 is connected to the oil return groove 34 .

[0057] Specifically, in this embodiment, the outer diameter of the second ring 52 of the spacer 5, the oil collecting groove 33 of the transparent cover 3, the outer wall of the stopper 35 and the inner wall of the bearing hole 13 of the housing 1 together form a first channel 335, and the outer diameter of the second ring 52 of the spacer 5, the oil return groove 34 of the transparent cover 3, the outer wall of the stopper 35 and the inner wall of the bearing hole 13 of the housing 1 together form a second channel 336. The first channel 335 is connected to the oil collecting groove 33 of the transparent cover 3, and the second channel 336 is connected to the oil return groove 34 of the transparent cover 3.

[0058] The spacer 5 and the bearing 6 are accommodated in the housing 1 . A retaining ring 53 is arranged inside the spacer 5 . A radial second oil inlet hole 54 and a second oil return hole 55 are formed on the side of the retaining ring 53 facing the bearing 6 .

[0059] Specifically, a bearing hole 13 is provided in the housing 1 , and the inner diameter of the bearing hole 13 is matched with the outer diameter of the second ring 52 of the spacer 5 to achieve radial positioning of the spacer 5 . The inner diameter of the bearing hole 13 is matched with the outer diameter of the bearing 6 , and the spacer 5 and the bearing 6 are accommodated in the bearing hole 13 .

[0060] More specifically, the entire first ring 51 and a portion of the second ring 52 of the spacer 5 are accommodated in the bearing hole 13 .

[0061] The oil collecting groove 33 is communicated with the second oil inlet hole 54 , and the oil return groove 34 is communicated with the second oil return hole 55 .

[0062] Specifically, in the embodiment in which the first channel 335 and the second channel 336 are provided, the oil collecting groove 33 is communicated with the second oil inlet hole 54 through the first channel 335 , and the oil return groove 34 is communicated with the second oil return hole 55 through the second channel 336 .

[0063] Optionally, the second oil inlet hole 54 is provided on the first ring 51, and a first notch 56 (such as Figure 7 The width of the first notch 56 matches the width of the oil collecting groove 33 .

[0064] Optionally, the second oil inlet hole 54 is provided on the second ring 52 , in which case no notch is required, and the second oil inlet hole 54 is still located on the side of the retaining ring 53 facing the bearing 6 .

[0065] The second oil return hole 55 is provided on the second ring 52 .

[0066] Optionally, in this embodiment, the second oil return hole 55 is aligned with the second oil inlet hole 54 and both are arranged in a vertical direction. This arrangement is to adapt to the flow pattern of the lubricating oil from high to low.

[0067] In the double sealing structure of the reducer in this embodiment, the lubricating oil in the housing 1 flows through the first oil inlet hole 11 to the oil collecting groove 33 of the transparent cover 3, and then flows to the second oil inlet hole 54, and enters the side of the spacer 5 close to the bearing 6. Due to the presence of the retaining ring 53, the lubricating oil remains on this side, which can not only fully lubricate the bearing 6, but also prevent the lubricating oil from flowing to the oil seal 4, effectively avoiding oil leakage. On the other hand, the lubricating oil flows out of the spacer 5 through the second oil return hole 55, enters the oil return groove 34 of the transparent cover 3, and then flows into the oil pool in the housing 1 through the first oil return hole 12 of the housing 1.

[0068] In the embodiment in which the first channel 335 and the second channel 336 are provided, the lubricating oil in the housing 1 flows to the oil collecting groove 33 of the transparent cover 3 through the first oil inlet hole 11 of the housing 1, and then flows to the second oil inlet hole 54 through the first channel 335. On the other hand, the lubricating oil flows out of the spacer 5 through the second oil return hole 55, and then enters the oil return groove 34 of the transparent cover 3 through the second channel 336, and then flows into the oil pool in the housing 1 through the first oil return hole 12 of the housing 1.

[0069] like Figure 1 and Figure 7 As shown, an oil storage bracket 7 protruding from the inner wall of the spacer 5 is also provided in the spacer 5 , and the oil storage bracket 7 is provided with a second oil return hole 55 , and the second oil return hole 55 runs through the oil storage bracket 7 and the spacer 5 .

[0070] By providing the oil storage bracket 7, the lubricating oil stored in the spacer 5 will not flow out of the spacer 5 until it reaches a certain height. The advantage of such a setting is to ensure that a certain height of lubricating oil is maintained in the spacer 5 to achieve a more sufficient lubrication effect on the bearing 6. The height of the oil storage bracket 7 is designed according to actual needs.

[0071] like Figure 6 As shown, further, the spacer 5 is provided with a second notch 57 at a position corresponding to the second oil return hole 55. The second notch 57 serves to connect the second oil return hole 55 and the second channel 336.

[0072] Optionally, the width of the second notch 57 matches the width of the oil return groove 34 .

[0073] Furthermore, the spacer 5 is also provided with a third oil return hole 58 . The third oil return hole 58 is provided on the retaining ring 53 . The radial height of the third oil return hole 58 is smaller than the radial height of the second oil return hole 55 .

[0074] According to the flow characteristics of the lubricating oil, the radial height in this embodiment is the distance from the third oil return hole 58 or the second oil return hole 55 to the center line of the rotating shaft 2 in the vertical direction.

[0075] The spacer 5 is further provided with a third notch 59 on the side of the retaining ring 53 facing the transparent cover 3 .

[0076] Optionally, there are two third oil return holes 58. The radial heights of the two third oil return holes 58 may be the same or different.

[0077] In this embodiment, the third oil return hole 58 is provided so that when the lubricating oil in the spacer ring 5 is not returned in time and the lubricating oil accumulates in the spacer ring 5 to the height of the third oil return hole 58, the lubricating oil can also flow out of the spacer ring 5 through the third oil return hole 58 until it flows into the oil pool in the housing 1, thereby making the oil return and oil leakage prevention effects of the double sealing structure of the reducer better.

[0078] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A double sealing structure for a reducer, It is characterized in that include: Box body, rotating shaft, transparent cover, oil seal, spacer and bearing; The transparent cover, the oil seal, the spacer and the bearing are sequentially sleeved on the rotating shaft, the transparent cover is connected to the box body, and the oil seal is located inside the transparent cover; The box body is provided with a first oil inlet hole and a first oil return hole along the axial direction of the rotating shaft, and the transparent cover is provided with an oil collecting groove and an oil return groove; The spacer and the bearing are accommodated in the housing, a retaining ring is arranged inside the spacer, and the spacer is provided with a radial second oil inlet hole and a second oil return hole on a side of the retaining ring facing the bearing; The oil collecting groove is respectively connected to the first oil inlet hole and the second oil inlet hole, and the oil return groove is respectively connected to the first oil return hole and the second oil return hole; The spacer is also provided with a third oil return hole, and the third oil return hole is arranged on the retaining ring. The radial height of the third oil return hole is smaller than the radial height of the second oil return hole. The radial height is the distance from the third oil return hole or the second oil return hole to the center line of the rotating shaft in the vertical direction. The spacer is also provided with a third notch on the side of the retaining ring facing the transparent cover.

2. The double sealing structure of the reducer according to claim 1, It is characterized in that The spacer ring includes a first ring and a second ring with different diameters. The first ring with a larger diameter abuts against the bearing, and the second ring with a smaller diameter partially extends into and abuts against the transparent cover. The outer diameter of the second ring is adapted to the inner hole of the transparent cover on the one hand, and on the other hand, a gap is left with the inner wall of the box to form a first channel and a second channel. The first channel is respectively connected to the oil collecting groove and the second oil inlet hole, and the second channel is respectively connected to the oil return groove and the second channel.

3. The double sealing structure of the reducer according to claim 2, It is characterized in that The second oil inlet hole is arranged on the first ring, and a first notch is arranged on the first ring corresponding to the second oil inlet hole.

4. The double sealing structure of the reducer according to claim 2, It is characterized in that An oil storage lever protruding from the inner wall of the spacer is also provided in the spacer, and the oil storage lever is provided with the second oil return hole, and the second oil return hole runs through the oil storage lever and the spacer.

5. The double sealing structure of the reducer according to claim 4, It is characterized in that The spacer is provided with a second notch at a position corresponding to the second oil return hole.

6. The double sealing structure of the reducer according to claim 5, It is characterized in that The third oil return holes include two.

7. The double sealing structure of the reducer according to any one of claims 2 to 6, It is characterized in that The transparent cover includes a stepped hole, which includes a first hole, a second hole and a third hole with successively increasing diameters, wherein the first hole is far away from the spacer, the third hole is close to the spacer, the first hole cooperates with the rotating shaft, the oil seal is accommodated in the second hole, and the spacer rests on the step surface formed by the second hole and the third hole.

8. The double sealing structure of the reducer according to claim 7, It is characterized in that The first ring of the spacer bears against the outer ring of the bearing.

9. The double sealing structure of the reducer according to claim 7, It is characterized in that The second ring of the spacer abuts against the step surface.

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