CN213236077U - Crankshaft oil seal structure and crankshaft assembly - Google Patents
Crankshaft oil seal structure and crankshaft assembly Download PDFInfo
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- CN213236077U CN213236077U CN202021877082.5U CN202021877082U CN213236077U CN 213236077 U CN213236077 U CN 213236077U CN 202021877082 U CN202021877082 U CN 202021877082U CN 213236077 U CN213236077 U CN 213236077U
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- crankshaft
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- oil baffle
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Abstract
The utility model relates to the field of engines, and discloses a crankshaft oil seal structure and a crankshaft assembly, wherein the crankshaft oil seal structure comprises a hub, an oil baffle plate and an oil thrower which are sequentially sleeved outside a crankshaft and are fixed relative to the crankshaft; a plurality of pump return plates are arranged between the oil baffle plate and the hub or between the oil thrower and the oil baffle plate, and the pump return plates are circumferentially distributed in sequence to form an impeller structure for introducing external air into the crankcase when the crankshaft rotates. The utility model forms an impeller structure by a plurality of pump return plates, and the impeller structure leads the outside air between the oil baffle plate and the hub when the crankshaft rotates, so as to promote the air to flow between the oil thrower and the oil baffle plate; because the flow direction of air is opposite to the flow direction of the oil-gas mixture, the oil-gas mixture can be prevented from flowing out through a gap between the oil baffle plate and the hub, and the air can be prevented from flowing into a crankcase through a gap between the oil thrower and the oil baffle plate, so that the oil-gas sealing of the rear end of the crankshaft is realized.
Description
Technical Field
The utility model relates to an engine field especially relates to a bent axle oil blanket structure and bent axle assembly.
Background
The crankshaft of the high-speed diesel engine has a large diameter, and when the crankshaft rotates at a high speed, the linear speed of the crankshaft and the pressure in the crankcase are both obviously increased. In order to prevent the leakage of the lubricating oil, a contact type sealing structure is generally used to seal the contact position of the crankcase and the crankshaft. However, when the crankshaft rotates at a high speed, the sealing lip of the sealing structure is greatly abraded, so that the service life of the sealing structure is reduced, and the requirement on the same service life as that of an engine cannot be met; and the installation precision of the contact type sealing structure is not easy to control, and lubricating oil leakage is easy to occur when the crankshaft jumps.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a bent axle oil blanket structure and crankshaft assembly not only improves the sealing performance between bent axle and the crankcase, can also prolong bent axle oil blanket structure's life.
To achieve the purpose, the utility model adopts the following technical proposal:
a crankshaft oil seal structure comprises a hub, an oil baffle plate and an oil thrower which are sequentially sleeved outside a crankshaft along the axial direction of the crankshaft, wherein the hub and the oil thrower are fixed relative to the crankshaft, and the crankshaft can rotate relative to the oil baffle plate;
the hub faces one side of the oil baffle plate, or the oil thrower faces one side of the oil baffle plate and is provided with a plurality of pump return plates, and the pump return plates are circumferentially distributed in sequence to form an impeller structure, so that the external air can flow along a gap between the hub and the oil baffle plate to a gap between the oil baffle plate and the oil thrower plate when the crankshaft rotates.
As a preferable technical scheme of the crankshaft oil seal structure, a first labyrinth seal structure is arranged between the oil baffle and the hub.
As a preferable technical solution of the above crankshaft oil seal structure, the impeller structure is disposed between the oil baffle and the hub, and along an air flow direction between the oil baffle and the hub, the first labyrinth seal structure is disposed at a downstream of the impeller structure.
As a preferable aspect of the above crankshaft oil seal structure, the first labyrinth seal structure includes:
the first sealing teeth are sequentially sleeved from inside to outside and connected to one side, facing the hub, of the oil baffle plate;
the plurality of second seal teeth are connected to the face of the hub facing one side of the oil baffle plate, the first seal teeth and the second seal teeth are arranged along the radial direction of the oil baffle plate from inside to outside in turn, and each free end of each second seal tooth is inserted between every two adjacent first seal teeth.
As a preferable technical scheme of the crankshaft oil seal structure, a second labyrinth seal structure is arranged between the oil baffle plate and the oil thrower.
As a preferable aspect of the above crankshaft oil seal structure, the second labyrinth seal structure includes:
the plurality of third sealing teeth are sequentially sleeved from inside to outside and are connected to one side, facing the oil thrower, of the oil baffle plate;
and the plurality of fourth sealing teeth are connected to one side of the oil thrower facing the oil baffle, the third sealing teeth and the fourth sealing teeth are sequentially and alternately arranged from inside to outside along the radial direction of the oil baffle, and the free end of each fourth sealing tooth is inserted between every two adjacent third sealing teeth.
As a preferable technical solution of the above crankshaft oil seal structure, the impeller structure is disposed between the oil slinger and the oil baffle, and is disposed at the downstream of the second labyrinth seal structure along the flowing direction of the oil-gas mixture between the oil slinger and the oil baffle.
As a preferred technical solution of the above crankshaft oil seal structure, the first seal tooth is spaced from the hub, and the second seal tooth is spaced from the oil baffle;
and/or the first sealing tooth and the second sealing tooth adjacent to the first sealing tooth are arranged at intervals;
and/or the third sealing tooth is arranged at an interval with the oil thrower, and the fourth sealing tooth is arranged at an interval with the oil baffle plate;
and/or the third sealing tooth and the fourth sealing tooth adjacent to the third sealing tooth are arranged at intervals.
As a preferable technical scheme of the crankshaft oil seal structure, the free end of the pump return plate and the oil baffle plate are arranged at intervals.
The utility model also provides a crankshaft assembly, including foretell bent axle oil blanket structure.
The utility model has the advantages that: the utility model forms an impeller structure by a plurality of pump return plates, and when the crankshaft rotates, the impeller structure is utilized to introduce the outside air between the oil baffle plate and the hub, so that the air flows to the space between the oil thrower and the oil baffle plate; because the flow direction of air is opposite to the flow direction of the oil-gas mixture, the oil-gas mixture can be prevented from flowing out through a gap between the oil baffle plate and the hub, and the air can be prevented from flowing into a crankcase through a gap between the oil thrower and the oil baffle plate, so that the oil-gas sealing at the rear end of the crankshaft is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a sectional view of a crankshaft oil seal structure provided in an embodiment of the present invention;
fig. 2 is a partial schematic view of a crankshaft oil seal structure provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a wheel hub according to an embodiment of the present invention.
In the figure:
1. a crankshaft; 2. a crankcase; 3. a hub; 4. an oil baffle plate; 5. an oil slinger; 6. pumping back the plate; 71. a first seal tooth; 72. a second seal tooth; 81. a third seal tooth; 82. a fourth seal tooth; 9. and a baffle plate.
Detailed Description
In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.
As shown in fig. 1 to 3, the present embodiment provides a crankshaft oil seal structure, which includes a hub 3, an oil baffle 4 and an oil thrower 5 sequentially sleeved outside a crankshaft 1, wherein the hub 3 and the oil thrower 5 are fixed with respect to the crankshaft 1, the crankshaft 1 is capable of rotating with respect to the oil baffle 4, specifically, the oil baffle 4 is connected to a crankcase 2 through a baffle 9, the baffle 9 is sleeved outside the hub 3, and the hub 3 is capable of rotating with respect to the baffle 9; a plurality of pump return plates 6 are arranged between one side, facing the oil baffle plate 4, of the hub 3, and the pump return plates 6 are circumferentially distributed in sequence to form an impeller structure, so that when the crankshaft 1 rotates, outside air can flow to a gap between the oil baffle plate 4 and the oil thrower 5 along the gap between the hub 3 and the oil baffle plate 4. In other embodiments, the pump-back plate 6 may also be provided on the side of the oil slinger 5 facing the oil baffle 4, with the above-described impeller structure formed between the oil slinger 5 and the oil baffle 4.
When the engine is running, the crankshaft 1 rotates, the pressure in the crankcase 2 will gradually rise, and the oil-gas mixture in the crankcase 2 will enter the area between the oil thrower 5 and the oil baffle 4 under the action of the pressure in the crankcase 2. In the embodiment, the impeller structure is formed by the pump return plates 6, and when the crankshaft 1 rotates, the impeller structure leads outside air into the space between the oil baffle plate 4 and the hub 3 through a gap between the hub 3 and the baffle plate 9, so that the air flows to the space between the oil thrower 5 and the oil baffle plate 4; because the flowing direction of the air is opposite to the flowing direction of the oil-gas mixture, the impeller structure can prevent the oil-gas mixture from flowing to the gap between the hub 3 and the baffle 9 through the gap between the oil baffle plate 4 and the hub 3 and flowing out, and can also prevent the air from flowing into the crankcase 2 through the gap between the oil thrower 5 and the oil baffle plate 4, thereby realizing the sealing of the rear end of the crankshaft 1 on the oil gas.
Further, a first labyrinth seal structure is arranged between the oil baffle 4 and the hub 3. The flow velocity of air entering between the oil deflector 4 and the hub 3 is attenuated by the first labyrinth structure.
Specifically, the first labyrinth seal structure comprises a first seal tooth 71 and a second seal tooth 72, the first seal tooth 71 is provided with a plurality of first seal teeth 71 which are sequentially sleeved from inside to outside, and the first seal teeth 71 are connected to one side of the oil baffle plate 4 facing the hub 3; the number of the second sealing teeth 72 is multiple, the second sealing teeth 72 are connected to one side, facing the oil baffle plate 4, of the hub 3, the first sealing teeth 71 and the second sealing teeth 72 are sequentially and alternately arranged from inside to outside along the radial direction of the oil baffle plate 4, and the free end of each second sealing tooth 72 is inserted between every two adjacent first sealing teeth 71. In this embodiment, the first seal tooth 71 and the second seal tooth 72 are both of a circular ring structure.
Preferably, the above-mentioned first labyrinth seal structure is provided upstream of the impeller structure in the air flow direction between the oil deflector 4 and the hub 3. In other embodiments, the first labyrinth seal structure may be disposed downstream of the impeller structure.
Further, a second labyrinth seal structure is arranged between the oil baffle 4 and the oil thrower 5. The movement speed of the oil-gas mixture between the oil baffle 4 and the oil slinger 5 is weakened by the first labyrinth seal structure.
Specifically, the second labyrinth seal structure comprises a plurality of third seal teeth 81 and fourth seal teeth 82, the third seal teeth 81 are sequentially sleeved from inside to outside, and the third seal teeth 81 are connected to one side of the oil baffle 4 facing the oil thrower 5; the number of the fourth seal teeth 82 is multiple, the fourth seal teeth 82 are connected to one side, facing the oil baffle 4, of the oil thrower 5, the third seal teeth 81 and the fourth seal teeth 82 are sequentially and alternately arranged from inside to outside along the radial direction of the oil baffle 4, and the free end of each fourth seal tooth 82 is inserted between every two adjacent third seal teeth 81. In this embodiment, the third seal tooth 81 and the fourth seal tooth 82 are both of a circular ring structure.
In the operation process of an engine, a crankshaft 1 rotates, the pressure in a crankcase 2 gradually rises, under the action of air pressure in the crankcase 2, an oil-gas mixture in the crankcase 2 enters a gap between an oil baffle plate 4 and an oil thrower 5 through a second labyrinth seal structure, the oil-gas mixture is subjected to oil-gas separation under the action of the second labyrinth seal structure, meanwhile, the second labyrinth seal structure is further provided with an effect of increasing flow resistance to reduce the movement speed of the oil-gas mixture, part of oil-gas in the oil-gas mixture is separated to form oil drops, and the oil drops with the reduced speed flow back to the crankcase 2 under the action of centrifugal force and gravity.
In order to avoid interference between the first seal tooth 71 and the second seal tooth 72 when the crankshaft 1 is in radial runout, the first seal tooth 71 and the second seal tooth 72 adjacent thereto are spaced apart. It is specifically required that the interval between the first seal tooth 71 and the second seal tooth 72 adjacent thereto is larger than the radial runout amount of the crankshaft 1, and the maximum radial runout amount of the crankshaft 1 can be determined through repeated tests.
In order to avoid interference between the first seal teeth 71 and the second seal teeth 72 when the crankshaft 1 axially moves, the first seal teeth 71 are spaced from the hub 3, and the second seal teeth 72 are spaced from the oil baffle 4. It is specifically required that the interval between the first seal tooth 71 and the hub 3 is larger than the axial displacement of the crankshaft 1, and the interval between the second seal tooth 72 and the oil baffle 4 is larger than the axial displacement of the crankshaft 1. The axial play displacement of the crankshaft 1 can be determined by repeated tests.
In order to avoid interference between the third seal tooth 81 and the fourth seal tooth 82 when the crankshaft 1 is in radial runout, the third seal tooth 81 and the fourth seal tooth 82 adjacent thereto are provided at a spacing. It is specifically required that the interval between the third seal tooth 81 and the fourth seal tooth 82 adjacent thereto is larger than the axial float displacement of the crankshaft 1.
In order to avoid interference between the third seal tooth 81 and the fourth seal tooth 82 when the crankshaft 1 axially moves, the third seal tooth 81 is spaced from the oil thrower 5, and the fourth seal tooth 82 is spaced from the oil baffle 4. Specifically, the third seal tooth 81 is spaced from the oil thrower 5 by a distance greater than the axial displacement of the crankshaft 1, and the fourth seal tooth 82 is spaced from the oil deflector 4 by a distance greater than the axial displacement of the crankshaft 1. The axial play displacement of the crankshaft 1 can be determined by repeated tests.
Preferably, the radial width of the first seal tooth 71 and the radial width of the second seal tooth 72 are equal, and the axial length of the first seal tooth 71 and the axial length of the second seal tooth 72 are equal. The radial width of the third seal tooth 81 and the radial width of the fourth seal tooth 82 are equal, and the axial length of the third seal tooth 81 and the axial length of the fourth seal tooth 82 are equal.
Since the medium physical property parameters of air and the oil-gas mixture are different, the radial width of the first seal tooth 71 is different from the radial width of the third seal tooth 81, and the axial length of the first seal tooth 71 is different from the axial length of the third seal tooth 81. Specifically, the radial width and the axial length of the first seal tooth 71, and the radial width and the axial length of the third seal tooth 81 can be determined by repeated tests.
Furthermore, the circumferential edge of the oil slinger 5 is provided with an oil slinger bent towards the side where the hub 3 is located, and the oil slinger forms a gradually expanding conical opening so that oil drops are thrown back into the crankcase 2 along the oil slinger under the action of centrifugal force.
The embodiment also provides a crankshaft assembly, which comprises the crankshaft oil seal structure.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (10)
1. The crankshaft oil seal structure is characterized by comprising a hub (3), an oil baffle plate (4) and an oil thrower (5) which are sequentially sleeved outside a crankshaft (1) along the axial direction of the crankshaft (1), wherein the hub (3) and the oil thrower (5) are fixed relative to the crankshaft (1), and the crankshaft (1) can rotate relative to the oil baffle plate (4);
wheel hub (3) face towards one side of oil baffle (4), or oil thrower (5) face towards one side of oil baffle (4) is equipped with a plurality of pump return plates (6), and is a plurality of pump return plates (6) circumference distributes in proper order and forms the impeller structure, is used for bent axle (1) makes external air can along when rotating wheel hub (3) with gap between oil baffle (4) to oil baffle (4) with gap between oil thrower (5) flows.
2. A crankshaft oil seal structure according to claim 1, characterized in that a first labyrinth structure is provided between the oil baffle plate (4) and the hub (3).
3. A crankshaft oil seal structure according to claim 2, characterized in that the impeller structure is provided between the oil baffle (4) and the hub (3), and the first labyrinth seal structure is provided downstream of the impeller structure in the direction of air flow between the oil baffle (4) and the hub (3).
4. A crankshaft oil seal structure according to claim 2, wherein the first labyrinth seal structure includes:
the first sealing teeth (71) are sequentially sleeved from inside to outside and are connected to one side, facing the hub (3), of the oil baffle plate (4);
a plurality of second seal teeth (72), connect in wheel hub (3) face towards one side of oil baffle (4), first seal tooth (71) with second seal tooth (72) are followed oil baffle (4) radially from inside to outside sets up in turn, every the free end of second seal tooth (72) all inserts adjacent two between first seal tooth (71).
5. A crankshaft oil seal structure according to claim 4, characterized in that a second labyrinth structure is provided between the oil baffle (4) and the oil thrower (5).
6. A crankshaft oil seal structure according to claim 5, characterized in that the second labyrinth seal structure comprises:
the plurality of third sealing teeth (81) are sequentially sleeved from inside to outside and are connected to one side, facing the oil thrower (5), of the oil baffle plate (4);
and the fourth sealing teeth (82) are connected to one side, facing the oil baffle plate (4), of the oil thrower (5), the third sealing teeth (81) and the fourth sealing teeth (82) are arranged along the radial direction of the oil baffle plate (4) from inside to outside in turn, and the free end of each fourth sealing tooth (82) is inserted between every two adjacent third sealing teeth (81).
7. A crankshaft oil seal arrangement according to claim 6, characterized in that the impeller arrangement is provided between the oil slinger (5) and the oil baffle (4), downstream of the second labyrinth seal arrangement in the direction of flow of the oil-gas mixture between the oil slinger (5) and the oil baffle (4).
8. A crankshaft oil seal structure according to claim 6, characterized in that the first seal tooth (71) is provided at a distance from the hub (3) and the second seal tooth (72) is provided at a distance from the oil deflector (4);
and/or the first sealing tooth (71) and the second sealing tooth (72) adjacent to the first sealing tooth are arranged at intervals;
and/or the third sealing tooth (81) is arranged at a distance from the oil thrower (5), and the fourth sealing tooth (82) is arranged at a distance from the oil baffle plate (4);
and/or the third sealing tooth (81) and the fourth sealing tooth (82) adjacent to the third sealing tooth are arranged at intervals.
9. A crankshaft oil seal structure according to any one of claims 1 to 8, characterized in that the free end of the pump-back plate (6) is disposed at a distance from the oil baffle plate (4).
10. A crankshaft assembly comprising a crankshaft oil seal structure according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021877082.5U CN213236077U (en) | 2020-09-01 | 2020-09-01 | Crankshaft oil seal structure and crankshaft assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021877082.5U CN213236077U (en) | 2020-09-01 | 2020-09-01 | Crankshaft oil seal structure and crankshaft assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213236077U true CN213236077U (en) | 2021-05-18 |
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ID=75903784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021877082.5U Active CN213236077U (en) | 2020-09-01 | 2020-09-01 | Crankshaft oil seal structure and crankshaft assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213236077U (en) |
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2020
- 2020-09-01 CN CN202021877082.5U patent/CN213236077U/en active Active
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