GB2486477A - Oil thrower - Google Patents

Oil thrower Download PDF

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Publication number
GB2486477A
GB2486477A GB201021367A GB201021367A GB2486477A GB 2486477 A GB2486477 A GB 2486477A GB 201021367 A GB201021367 A GB 201021367A GB 201021367 A GB201021367 A GB 201021367A GB 2486477 A GB2486477 A GB 2486477A
Authority
GB
United Kingdom
Prior art keywords
wheel
oil
oil thrower
ring
thrower
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.)
Withdrawn
Application number
GB201021367A
Other versions
GB201021367D0 (en
Inventor
Nigel Paul Schofield
Stephen Dowdeswell
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.)
Edwards Ltd
Original Assignee
Edwards Ltd
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 Edwards Ltd filed Critical Edwards Ltd
Priority to GB201021367A priority Critical patent/GB2486477A/en
Publication of GB201021367D0 publication Critical patent/GB201021367D0/en
Publication of GB2486477A publication Critical patent/GB2486477A/en
Withdrawn legal-status Critical Current

Links

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
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/36—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with feed by pumping action of the member to be lubricated or of a shaft of the machine; Centrifugal lubrication
    • F16N7/363—Centrifugal 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
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/14—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the lubricant being conveyed from the reservoir by mechanical means
    • F16N7/16—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the lubricant being conveyed from the reservoir by mechanical means the oil being carried up by a lifting device
    • F16N7/20—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the lubricant being conveyed from the reservoir by mechanical means the oil being carried up by a lifting device with one or more members moving around the shaft to be lubricated
    • F16N7/22—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the lubricant being conveyed from the reservoir by mechanical means the oil being carried up by a lifting device with one or more members moving around the shaft to be lubricated shaped as rings
    • 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
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/14—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the lubricant being conveyed from the reservoir by mechanical means
    • F16N7/16—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the lubricant being conveyed from the reservoir by mechanical means the oil being carried up by a lifting device
    • F16N7/24—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the lubricant being conveyed from the reservoir by mechanical means the oil being carried up by a lifting device with discs, rollers, belts or the like contacting the shaft to be lubricated

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Details Of Gearings (AREA)

Abstract

An oil thrower for mounting on a rotatable shaft 1 has a mounted wheel 2, and an endless conveyer 3 having a perimeter greater than the diameter of the wheel. The conveyor may be in the form of a ring or belt, and it engages with the periphery of the wheel and an oil reservoir 5 such that rotation of the wheel causes travel of the conveyer about the wheel periphery and transports oil between the reservoir and the wheel. The conveyor may be stiff or flexible, and may be made of a rubber-like material. The wheel may also include a an annular recess (4 fig 2) such that a pulley is formed.

Description

OIL THROWER
The present invention relates to oil throwers in particular, but not exclusively having application in vacuum pumps.
Oil throwers are common in reciprocating or rotary machinery and serve to project lubricating oil onto various moving parts of the equipment and circulate lubricant about a system. Various forms are known some examples of which are described below.
US 5 647 735 discloses a centrifugal pump in which is incorporated a lubricating system based around a rotating shaft. A lubrication (oil) dispenser is arranged to rotate with the shaft and as it does so multiple blades extend radially outwardly of the dispenser, thereby to disperse a mist of lubricant oil about moving parts within a surrounding chamber.
us s 632 608 discloses a motor driven pump incorporating a rotating shaft to which a lubricant dispenser is mounted. The dispenser is in the form of a thin-profiled disc and has connected about its outer periphery a plurality of wire like members which are arranged to dip into a lubricant sump as the shaft and dispenser rotate.
WO 20004/0769 11 a lubricant dispensing disc which is arranged to rotate with a rotating shaft. Axially extending recesses are provided adjacent the outer periphery of the disc. As the disc rotates, these extensions dip into a sump of lubricant and collect it for dispersing about the surrounding chamber.
These variations on a spinning disc dipping into an oil sump are reliable methods of distributing oil around a chamber, however it has been recognised that high shaft speeds result in significant drag on the disc and consequently an excessive amount of oil thrown in the chamber and power required to maintain high shaft speeds.
The present invention seeks to provide an oil thrower that uses less power than previously used designs and gives a more metered delivery than prior art oil throwers.
In accordance with the present invention there is provided an oil thrower mountable on a rotatable shaft, the oil thrower comprising a wheel configured for concentric, fixed mounting on the shaft or cooperation with the shaft, and an endless conveyer having a perimeter greater than the diameter or perimeter of the wheel and engaging with the periphery of the wheel such that rotation of the wheel causes travel of the conveyer about the wheel periphery. A portion of the conveyor is arranged to dip into or engage with a lubricant reservoir disposed in a sump and to carry lubricant from the sump to the wheel. The wheel is arranged to disperse oil conveyed to the wheel by the conveyor. The wheel is rotatable with sufficient speed to fling oil or lubricant off the periphery of the wheel, whereas the conveyor travels along a path to maximise the volume of oil or lubricant transported to the wheel.
In one simple embodiment, the endless conveyer is a generally circular ring of diameter greater than the diameter of the wheel. The conveyer may comprise any oil compatible material and, for example, may be an 0-ring comprising rubber or a rubber like material. In alternative arrangements, the endless conveyer may be provided in the form of a flexible belt or chain, or the conveyor might comprise a stiff ring-shape device made from appropriate material such as high impact plastic or metal.
The wheel can conveniently have a smaller diameter than is typical for a conventional disc thrower. During operation, the wheel is arranged to be above or free of the surface of oil or lubricant in the sump. The lubricant is convey or transported to the wheel by the conveyor and then distributed appropriately from the wheel by being flung off the circumferential perimeter of the wheel as a result of the wheel's rotational movement.
In a preferred option, the wheel comprises a pulley wheel having an annular recess carried in its outer circumferential surface. The walls of the recess serve both to retain the conveyer and disperse oil transferred to the wheel by the conveyer.
In one alternative option, the periphery of the wheel might comprise teeth like projections to engage with complementing grooves on the inner surface of the conveyer.
In use, the conveyer is arranged such that a portion of its circumference distal to the wheel dips into an oil sump to pick up oil from the sump -oil clings to the conveyor as a result of surface tension. As the conveyor circumference travels, the dipped portion travels at a relatively slow speed to the periphery of the wheel and oil is transferred to the wheel's periphery. As the wheel rotates with the shaft at a relatively high speed, collected oil is dispersed from the periphery about the surrounding chamber in much the same fashion as for a conventional disc oil thrower.
The novel arrangement described is particularly beneficial when the shaft is rotating at high speeds. The longer perimeter of the conveyer compared to the wheel circumference enables collection of oil from the sump at a slower speed than with a conventional disc arrangement.
The quantity of oil continually collected and dispersed is reduced avoiding problems of over lubrication of components in the chamber. Furthermore, the power consumption of the thrower is reduced over conventional disc arrangements as there is less drag on the conveyer when compared to a conventional disc thrower.
An embodiment of the invention will now be further described with reference to the accompanying Figures in which: Figure 1 shows a cross section through a shaft carrying the oil thrower arrangement of an embodiment of the present invention; Figure 2 shows the embodiment of Figure 1 in a side view.
The Figures show a rotating shaft (1) about which is fixedly mounted a pulley wheel (2) above a sump (5) containing lubricant or oil. As the shaft (1) rotates, the pulley wheel (2) rotates in unison about the same axis. An oil pick up ring (3) engages an annular recess (4) in the outer circumference of the pulley wheel (2). The diameter of the ring (3) is three to four times that of the pulley wheel (2). The ring extends into the oil sump (5) provided in a chamber in which the shaft (1) and oil thrower (2, 3, 4) are located. The sump accommodates a reservoir of oil or lubricant, the top of level of which is arranged so that oil in the sump engages with the ring but does not engage the wheel -the wheel is kept clear of the oil during operation.
Rotation of the shaft (1) causes rotation of the pulley wheel (2) and also the ring (3) in one direction. However, due to the difference in the perimeter lengths of the wheel (2) and ring (3), any point on the ring (3) travels at a fraction of the speed of a point on the periphery of the wheel (2). The arrangement allows oil from the sump (5) to be collected at a much slower speed than it is dispersed.
As the ring rotates it passes through a portion of the oil in the sump. Oil from the top portion of the oil reservoir clings to the ring and is transferred by the ring towards the wheel. The rotational speed of the ring is sufficiently slow to prevent oil from being flung from the ring due to centrifugal forces, but the ring's rotational speed is sufficiently fast to effectively transport oil to the wheel without too much oil falling back along the ring to the sump as oil is transported. A significant portion of the oil is transferred to the wheel when the oil conveyed to the wheel by the ring reaches the wheel. The wheel has a significantly faster rotational speed than the ring, so oil transferred to the wheel will be flung off the wheel because of the increased centrifugal forces associated with the fast-spinning wheel -the wheel rotates at a sufficient speed for oil to be flung from the wheel.
The power consumption of the oil thrower is reduced when compared to conventional thrower mechanisms because of the reduced drag associated with the thrower's interaction with the oil. The ring has a reduced cross-sectional area compared to conventional disc throwers.
Furthermore, the arrangement of the present invention allows oil to be transported to the thrower mechanism by the ring in a way which allows the oil to be thrown effectively. The wheel can be located at a position in the chamber that maximises the efficiency of oil being received by the parts or components which need lubrication.
It will be understood the shape of the pulley wheel (2) can affect the grip on the pick up ring (3). This and other parameters can be adjusted to give a preferred level of slip to suit a specific application of the thrower.
Advantageously the pick up component (or conveyor) can be arranged to dip into the top surface layer of the oil in the sump. This can help avoid re-circulating and dirt or contaminants that will sink in the oil towards the bottom of the sump under the influence of gravity.
It will be appreciated that it is not essential for the pick up component to be circular in order to achieve the desired effect. For instance, the pick-up component can be arranged to follow a serpentine path from the oil sump to the dispersing wheel to allow the wheel to be positioned to maximise distribution of oil. In such an arrangement various numbers of pulleys wheels might be arranged to guide the pick up component along its desired path. If the pulley wheels are of sufficiently small diameter, they can be driven by interaction with the conveyor and used to disperse oil or lubricant in and around the location of the pulley wheel. Also, an additional wheel can be arranged to maintain the position of the pick up component in the oil. Such an additional wheel could prevent the conveyor or pick-up component from simply spinning around the shaft.
The pick-up component could also comprise a ring of material formed in a stiff, non-flexible shape. In such an arrangement, the pick-up component might be formed of Nylon (RTM) or other man-made material, metal or reinforced material.
An additional pulley wheel might be needed to maintain the lower portion of the pick-up component in the oil of the sump and prevent the pick-up component from spinning around the shaft as the shaft is rotated at speed. The lower pulley wheel might be secured to the sump housing or it might rest in a lower position by virtue of its weight.
It will also be appreciated that arrangements other than an annular recess in the wheel circumference will serve to position and guide the pick up component without significantly altering the operation of the described invention.
The wheel can be arranged as an integral component of the shaft having the same or a different diameter to the shaft's diameter.

Claims (11)

  1. CLAIMS1. An oil thrower for use on a rotatable shaft, the oil thrower comprising a wheel arranged to cooperate with the shaft, and an endless conveyer having a perimeter greater than the perimeter of the wheel and engaging with a point on the periphery of the wheel such that the conveyor extends from the wheel to engage with an oil reservoir and whereby rotation of the wheel causes the conveyer to travel between an oil reservoir and the wheel periphery.
  2. 2. An oil thrower as claimed in claim 1 wherein the endless conveyer is a ring of diameter greater than the diameter of the wheel.
  3. 3. An oil thrower as claimed in claim 2 wherein the ring comprises an 0-ring of rubber or a rubber-like material.
  4. 4. An oil thrower as claimed in claim 1 wherein the endless conveyer comprises one of flexible belt, flexible chain or a ring of stiff material,
  5. 5. An oil thrower as claimed in any preceding claim wherein the wheel comprises a pulley wheel having an annular recess carried in its outer circumferential surface.
  6. 6. An oil thrower as claimed in any of claims 1 to 4 wherein the periphery of the wheel comprises teeth like projections to engage with complementing grooves on the inner surface of the conveyer.
  7. 7. An oil thrower according to any preceding claim, wherein, during use the wheel is arranged to rotate at a speed sufficient to fling oil conveyed to the wheel from the wheel.
  8. 8. An oil thrower according to any preceding claim, wherein, during use the conveyor is arranged to rotate at a speed sufficient to convey oil picked up from the oil sump to the wheel.
  9. 9. An oil thrower according to any preceding claim, wherein the wheel is integral with the shaft.
  10. 10. An oil thrower according to any preceding claim, wherein the wheel and the shaft have the same diameter.
  11. 11. A vacuum pump incorporating an oil thrower as claimed in any preceding claim.
GB201021367A 2010-12-16 2010-12-16 Oil thrower Withdrawn GB2486477A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB201021367A GB2486477A (en) 2010-12-16 2010-12-16 Oil thrower

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201021367A GB2486477A (en) 2010-12-16 2010-12-16 Oil thrower

Publications (2)

Publication Number Publication Date
GB201021367D0 GB201021367D0 (en) 2011-01-26
GB2486477A true GB2486477A (en) 2012-06-20

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GB201021367A Withdrawn GB2486477A (en) 2010-12-16 2010-12-16 Oil thrower

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191113534A (en) * 1911-06-06 1911-10-12 Fred Wiebens Improvements in and relating to Lubricators.
GB191416436A (en) * 1913-07-21 1915-01-21 Const Electr Du Nord Et De L E Improvements in and relating to Lubricating Arrangements.
US1847418A (en) * 1927-06-02 1932-03-01 Curtis Mfg Co Lubricating system for piston machines
US1869362A (en) * 1929-12-23 1932-08-02 Curtis Mfg Co Lubricating system for piston machines
US2540103A (en) * 1948-01-23 1951-02-06 American Brake Shoe Co Lubricating system
US2546887A (en) * 1946-01-19 1951-03-27 American Brake Shoe Co Lubricating system
FR2010928A1 (en) * 1968-06-14 1970-02-20 Wuelfel Eisenwerk
GB2307004A (en) * 1995-11-09 1997-05-14 Timothy Charles Woodhouse Engine lubrication system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191113534A (en) * 1911-06-06 1911-10-12 Fred Wiebens Improvements in and relating to Lubricators.
GB191416436A (en) * 1913-07-21 1915-01-21 Const Electr Du Nord Et De L E Improvements in and relating to Lubricating Arrangements.
US1847418A (en) * 1927-06-02 1932-03-01 Curtis Mfg Co Lubricating system for piston machines
US1869362A (en) * 1929-12-23 1932-08-02 Curtis Mfg Co Lubricating system for piston machines
US2546887A (en) * 1946-01-19 1951-03-27 American Brake Shoe Co Lubricating system
US2540103A (en) * 1948-01-23 1951-02-06 American Brake Shoe Co Lubricating system
FR2010928A1 (en) * 1968-06-14 1970-02-20 Wuelfel Eisenwerk
GB2307004A (en) * 1995-11-09 1997-05-14 Timothy Charles Woodhouse Engine lubrication system

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Publication number Publication date
GB201021367D0 (en) 2011-01-26

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)