CN112539280A - Oil slinger arrangement with labyrinth seal - Google Patents

Oil slinger arrangement with labyrinth seal Download PDF

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Publication number
CN112539280A
CN112539280A CN202011000846.7A CN202011000846A CN112539280A CN 112539280 A CN112539280 A CN 112539280A CN 202011000846 A CN202011000846 A CN 202011000846A CN 112539280 A CN112539280 A CN 112539280A
Authority
CN
China
Prior art keywords
shaft
oil
labyrinth seal
oil slinger
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011000846.7A
Other languages
Chinese (zh)
Inventor
N·福伊希特纳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of CN112539280A publication Critical patent/CN112539280A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/54—Other sealings for rotating shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/447—Labyrinth packings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/65—Gear shifting, change speed gear, gear box

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Details Of Gearings (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

The invention relates to a device (101) for an oil slinger with a labyrinth seal, comprising a shaft (107) and a housing (117); wherein the shaft (107) has at least one oil slinger (121) for sealing a gap extending between the shaft (107) and the housing (117). The device has a labyrinth seal (123) for sealing the gap; wherein the labyrinth seal (123) is arranged behind the oil slinger (121) from the interior of the housing (117).

Description

Oil slinger arrangement with labyrinth seal
Technical Field
The invention relates to an oil slinger device with a labyrinth seal.
Background
If the electric motor is coupled to the transmission, the oil chamber of the transmission must be sealed relative to the electric motor. For this purpose, solutions known from the prior art use radial shaft seal rings. These radial shaft seal rings have contact seal lips. To dissipate the frictional heat generated at high rotational speeds, the shaft needs to be cooled internally at high cost.
Labyrinth seals that operate without contact do not have the thermal problems described above. However, labyrinth seals cannot be used in vehicle applications. When the vehicle is stationary on a slope, there is a risk of leakage.
Disclosure of Invention
The invention is based on the object of improving the sealing of a shaft with respect to a rotationally fixed structure. This object is achieved by an arrangement of an oil slinger with a labyrinth seal.
The device includes a shaft and a housing. The housing is a structure enclosing a cavity (the interior of the housing) in which the technical components (e.g. shaft, gears and bearings) are arranged under co-action. Here, a gap extends between the shaft and the housing. In particular, a play which is rotationally symmetrical to the axis of rotation of the shaft can be provided.
In order to prevent oil from leaking through the gap, the gap must be sealed. For this purpose, the shaft has at least one oil slinger. This oil slinger is a ring designed to fling oil radially outward by centrifugal forces acting upon rotation. By the rotation of the oil slinger, centrifugal forces act on the oil, which forces the oil to flow out radially outward on the oil slinger first with respect to the rotational axis of rotation. The deflector edge (Abrisskante) of the oil slinger is arranged such that the oil flows due to centrifugal forces in the direction of the deflector edge. On the deflector edge, the oil is splashed away from the oil slinger in the radial direction. The flow guiding edge is preferably designed as a radially outwardly directed tip.
The oil slinger is rotationally symmetric with the axis of rotation of the shaft. The oil slinger is fixed to the shaft in a rotationally fixed manner. The oil slinger may in particular be rigid, i.e. fixed to the shaft in a manner without the possibility of relative movement. Here, the shaft extends through an oil slinger. This implies that the oil slinger has a recess in the middle, the edge of which circumferentially surrounds the shaft.
According to the invention, a labyrinth seal for sealing the gap is provided in addition to the slinger. The labyrinth seal is also a contactless shaft seal, as is the case with oil slingers. The labyrinth seal forms a rotationally symmetrical gap which extends in a labyrinth manner, i.e. the direction of the course of the gap is changed several times. In particular, the gap can be oriented in its radial direction several times, so that the gap extends in the opposite radial direction. The change of direction through the gap increases the path that the oil must travel when leaking. Thereby increasing the resistance of the gap against leakage. Thus, the risk of leakage is reduced.
Here, the labyrinth seal is arranged from the interior of the housing behind the oil slinger. This preferably applies to the axial direction with respect to the axis of rotation of the shaft. If the labyrinth seal is arranged axially behind the oil slinger from the interior of the housing, the labyrinth seal and the oil slinger are on different sides of a plane oriented radially (i.e. orthogonally) with respect to the axis of rotation of the shaft. The oil slinger and the interior of the housing are on the same side of this plane. A labyrinth seal is disposed on the other side of the plane.
Since the slinger and labyrinth seal relate to a contactless seal, the problem of temperature rise at high rotational speeds of the shaft is alleviated. Furthermore, the combination of the slinger and labyrinth seal has been shown to be particularly effective in preventing leakage.
In a preferred development, the shaft has a shoulder arranged between the oil slinger and the labyrinth seal. In particular, the shoulder may be arranged axially between the oil slinger and the labyrinth seal relative to the axis of rotation of the shaft. With this arrangement, the leakage oil must first pass through the slinger, then through the shoulder and finally through the labyrinth seal.
According to a development, the diameter of the shaft on the shoulder increases towards the labyrinth seal. This means, on the contrary, that the diameter of the shaft on the shoulder decreases towards the slinger. The diameter of the shaft in the slinger is therefore smaller than the diameter of the shaft in the labyrinth seal. The shoulder acts as an additional barrier against oil spillage. Thereby improving the sealing action.
In a further preferred development, the labyrinth seal is formed by a first ring and a second ring. The shaft has a first ring and the housing has a second ring. Preferably, the first ring and the second ring relate to separate components fixed on the shaft or in the housing. The fixation of the first ring on the shaft and the fixation of the second ring in the housing are at least rotationally fixed, so that there is a rotationally fixed connection between the first ring and the shaft and between the second ring and the housing, respectively. The labyrinth gap extends between the first ring and the second ring. The development makes it possible to achieve particularly simple production and assembly of the labyrinth seal.
The device is preferably modified such that the first ring forms the shoulder described above. This improves the sealing action without additional necessary expenditure.
In order to receive the oil thrown off by the oil slinger, the rotationally fixed structure is preferably modified with at least one recess. The recess is arranged such that the thrown-off oil enters into the recess. Preferably, the dimples are located farther radially outward from the oil slinger. In order to fully receive the thrown-off oil, the recess is preferably rotationally symmetrical to the axis of rotation of the shaft. In particular, the recess can relate to an annular groove which is preferably rotationally symmetrical to the axis of rotation of the shaft.
The oil received by the recess collects in the recess and must be conducted away therefrom. For this purpose, in a preferred development at least one oil line or oil-conducting connection is provided. The oil line leads to the recess. Thus, the first port of the oil line is in the recess. This means that the wall of the recess has a first mouth. The first port of the oil line forms an outlet through which the oil thrown out by the oil slinger and received by the depression flows out.
The oil-guiding connection connects the recess with the interior of the housing in an oil-guiding manner. This implies that the oil conducting connection opens into the interior of the housing, the second mouth of the oil conducting connection thus being in the interior of the housing.
The oil line can be designed, for example, as a gap which is rotationally symmetrical to the axis of rotation of the shaft. The oil line may also relate to a bore, in particular a borehole, or a line, for example. The oil line is preferably designed in one piece with the rotationally fixed structure. The oil-conducting connection is different from a gap extending between the shaft and a rotationally fixed structure.
The device is preferably modified with a transmission. The housing of the transmission is identical to that described above. The shaft mentioned above relates to the input shaft of the transmission. Thus, according to a development, the input shaft of the transmission is sealed against oil spillage.
Furthermore, the device is preferably modified with a motor, for example an electric motor. Due to the advantageous temperature properties of the sealing device, a fast rotating motor may be involved. The output shaft of the motor is connected in a rotationally fixed manner to the input shaft of the transmission. In particular, the output shaft and the input shaft may be connected to each other in one piece.
Drawings
A preferred embodiment of the present invention is shown in fig. 1. Showing in detail:
fig. 1 shows a longitudinal section of a power train.
Detailed Description
The powertrain 101 illustrated in fig. 1 includes a transmission 103 and an electric motor 105. The transmission 103 has a shaft 107 with a first gear 109 and a second gear 111. The second gear 111 meshes with a pinion 113 of an output shaft 115. The output shaft 115 is also the input shaft of the motor 105.
The shaft 107 with the first gear 109 and the second gear 111 and the transmission-side portion of the shaft 115 with the pinion 113 are within a housing 117. The housing 117 is filled with oil and encloses the components of the transmission 103 from the outside.
Because the shaft 115 exits the housing 117 into the motor 105, the housing 117 must be sealed with respect to the shaft 115. Otherwise, oil may enter the motor 105 from the housing 117. For this purpose, a sealing device 119 is provided.
The seal 119 comprises an oil slinger 121 and a labyrinth seal 123. Both the oil slinger and the labyrinth seal are rotationally fixed to the shaft 115 and rotate with this shaft about a common axis. The oil slinger 121 is disposed forward of the labyrinth seal 123 in a direction toward the motor 105 from the transmission 103. Thus, oil from the housing 117 first passes through the oil slinger 121. The remaining oil not trapped by the slinger 121 eventually passes through the labyrinth seal 123.
Centrifugal force acts on the oil slinger 121 due to the rotation of the shaft 115. The oil slinger 121 is provided with a pointed, radially outwardly directed lip 125. The oil is thrown off over the tip of the lip 125 and into the gap 127.
The gap 127 connects the oil slinger 121 with the bearing 129 in an oil-conducting manner. The gap extends at a slope. Therefore, the oil in the gap 127 flows in the direction of the bearing 129 due to gravity.
In the example illustrated in fig. 1, the shaft 107 is rotatably supported in the housing 117 by means of a bearing 129. However, any other bearing arranged in the housing 117 may also be involved.
The bearing 129 is implemented as a tapered roller bearing. The rolling elements of the tapered roller bearing each have the shape of a truncated cone. The axis of rotation of the bearing 129 extends parallel to the axis of rotation of the shaft 115. As the bearing 129 rotates, an oil transport effect is created in a direction towards these axes. Oil is transported from the top surface to the bottom surface of the respective truncated cone.
The top surface of the rolling body of the bearing 129 faces the gap 127. Thus, the oil hits the top surface from the gap 127 and is transported in the axial direction away from the gap 127 by the described transport effect in the direction of the interior of the housing 117. In this way, the bearing 129 assists the sealing function of the sealing device 119.
List of reference numerals
101 drive train
103 transmission device
105 electric motor
107 shaft
109 first gear
111 second gear
113 pinion gear
115 output shaft
117 shell
119 sealing device
121 oil slinger
123 labyrinth seal
125 lips
127 gap
129 bearing

Claims (8)

1. An arrangement (101) of oil slingers with labyrinth seals, said arrangement having a shaft (107) and a housing (117); wherein
The shaft (107) having at least one oil slinger (121) for sealing a gap extending between the shaft (107) and the housing (117); it is characterized in that the preparation method is characterized in that,
a labyrinth seal (123) for sealing the gap; wherein
The labyrinth seal (123) is arranged behind the oil slinger (121) from the inside of the housing (117).
2. The arrangement (101) of an oil slinger with a labyrinth seal of claim 1; it is characterized in that the preparation method is characterized in that,
the shaft (107) having a shoulder disposed between the oil slinger (121) and the labyrinth seal (123); wherein
The diameter of the shaft (107) on the shoulder increases toward the labyrinth seal (123).
3. -a device (101) of oil slinger with labyrinth seal according to the previous claim 2; it is characterized in that the preparation method is characterized in that,
the shaft (107) has a first ring and the housing (117) has a second ring; wherein
The first and second rings form the labyrinth seal (123).
4. -a device (101) of oil slinger with labyrinth seal according to the cited claim 3; it is characterized in that the preparation method is characterized in that,
the first ring forms the shoulder.
5. -a device (101) of oil slinger with labyrinth seal according to any one of the previous claims; it is characterized in that the preparation method is characterized in that,
the housing (117) has at least one recess (127) for receiving oil thrown by the oil slinger (121).
6. -a device (101) of oil slinger with labyrinth seal according to claim 5; which is characterized by comprising
At least one oil-conducting connection between the recess (127) and the interior of the housing (117).
7. -a device (101) of oil slinger with labyrinth seal according to any one of the previous claims; it is characterized in that the preparation method is characterized in that,
a transmission (103); wherein
The shaft (107) forms an input shaft of the transmission (103).
8. -a device (101) of oil slinger with labyrinth seal according to any one of claims 1-7; it is characterized in that the preparation method is characterized in that,
a motor (105); wherein
An output shaft (115) of the motor (105) is connected to the shaft (107) in a rotationally fixed manner.
CN202011000846.7A 2019-09-23 2020-09-22 Oil slinger arrangement with labyrinth seal Pending CN112539280A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019214505.1 2019-09-23
DE102019214505.1A DE102019214505A1 (en) 2019-09-23 2019-09-23 Slinger with labyrinth seal

Publications (1)

Publication Number Publication Date
CN112539280A true CN112539280A (en) 2021-03-23

Family

ID=74846243

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011000846.7A Pending CN112539280A (en) 2019-09-23 2020-09-22 Oil slinger arrangement with labyrinth seal

Country Status (3)

Country Link
KR (1) KR20210035727A (en)
CN (1) CN112539280A (en)
DE (1) DE102019214505A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022120246A1 (en) 2022-08-11 2024-02-22 Schaeffler Technologies AG & Co. KG Electromotive drive unit and robot arm

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE930961C (en) * 1942-05-16 1955-07-28 Daimler Benz Ag Oil sealing on bearings of high-speed shafts, especially for the loading fan of aircraft engines
KR950008505B1 (en) * 1985-11-04 1995-07-31 카롤 앤 맥키 Lubricant restricting device
GB8821870D0 (en) * 1988-09-06 1988-10-19 Brown David Corp Plc Gearbox
JP5131968B2 (en) * 2007-11-09 2013-01-30 新日鐵住金株式会社 Railway vehicle gear system
US10767751B2 (en) * 2016-03-29 2020-09-08 Mitsubishi Electric Corporation Planetary gear device and vehicle wheel drive device
TWI603020B (en) * 2016-11-04 2017-10-21 財團法人工業技術研究院 Fluid machinery lubrication system assembly

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Publication number Publication date
DE102019214505A1 (en) 2021-03-25
KR20210035727A (en) 2021-04-01

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