CN110953470B

CN110953470B - Lubricant distributor and cavity lubrication device

Info

Publication number: CN110953470B
Application number: CN201910411518.7A
Authority: CN
Inventors: M.赫克特; P.霍普; J.克鲁茨坎佩尔; H.施密特; D.舍恩赫尔
Original assignee: SKF Lubrication Systems Germany AG
Current assignee: SKF Lubrication Systems Germany GmbH
Priority date: 2018-09-26
Filing date: 2019-05-17
Publication date: 2023-04-21
Anticipated expiration: 2039-05-17
Also published as: CN110953470A; DE102018216483A1

Abstract

The invention relates to a lubricant dispenser, which has the following technical characteristics: -at least one housing element, -a lubricant dispensing element rotatably arranged relative to the housing element, -a sensor unit configured to be able to detect a rotation of the lubricant dispensing element relative to the housing element.

Description

Lubricant distributor and cavity lubrication device

Technical Field

The invention relates to a lubricant distributor and a cavity lubrication device with the lubricant distributor.

Background

Lubricant dispensers are known in various embodiments. There is a lubricant distributor in which lubricant, typically oil or grease, is released from a central reservoir through a pipeline system to different lubrication points. On the other hand, lubricant dispensers are also known, which are in particular equipped for applying the lubricant as uniformly as possible to the inside of the hollow body. This allows, for example, lubrication of the inside of barrels, pipes, rings, internal threads, and other, in no way merely cylindrical cavities or hollow bodies. One embodiment of this type of rotary lubricant distributor is a so-called rotary oilcan, in which a rotary lubricating head is arranged in a cavity. A channel system is formed in the lubricating head, into which oil or other fluid lubricant is introduced and is thrown out of the lubricating head in view of centrifugal forces and thus reaches the inner wall of the cavity. The lubricating head then moves axially into the hollow body or outwardly from the hollow body so that the desired inner surface is wetted by the oil. The channel system can be formed by a radially extending through-hole with a simple construction of the system, but can also have a complex geometry.

In the known embodiment, the lubricating head is configured cup-shaped, that is to say has a cylindrical wall and a substantially circular base plate. The lubrication head surrounds the housing with a wall portion, and a shaft protrudes from an end side of the housing, and the lubrication head is held on the shaft. Alternatively, the wall may merely enclose a shaft, which in turn protrudes from the housing. The shaft is in turn rotatably supported in a housing and can be caused to rotate by a drive. Typically up to several thousand revolutions per minute. A plurality of channels are arranged starting from the inner side of the bottom plate or wall portion, which channels extend to the radially outer end. In a known embodiment, the oil is introduced into the lubricating head by means of an external application device.

Disclosure of Invention

Various known constructions of rotary oilers have limitations in operability and applicability due to structural limitations. The object of the present invention is to provide a further improved lubricant distributor.

The technical problem is solved by the preferred embodiments of the present invention. Accordingly, a lubricant dispenser is provided, which has the following technical features:

at least one of the housing elements is provided with a housing element,

a lubricant dispensing element rotatably arranged with respect to the housing element,

a sensor unit configured to be able to detect a rotation of the lubricant dispensing element relative to the housing element.

In many applications, visual monitoring of the lubricant distribution element cannot be achieved during operation. This may occur, for example, in an automated device or when the lubricant dispensing element enters a cavity that is not peepable from the outside. It is therefore advantageous to be able to monitor the correct functioning of the lubricant dispensing element by means of the sensor unit already provided. By implementing the sensor unit as a rotary sensor unit, a plurality of possible failure modes can be monitored simultaneously. For example, the drive motor may fail and the lubricant dispensing element does not rotate despite the power input, which would be detected by the sensor unit. Furthermore, the lubricant distribution element may lose its connection to the motor, since the fastening, for example on the shaft, is released. The sensor unit is also arranged here, so that no correct rotation of the lubricant dispensing element takes place. In both cases maintenance operations are required. Preferably, the lubricant distributor has a shaft rotatably arranged in the housing element, on which shaft the lubricant distributor element is held, wherein the shaft is connected to the drive device and can be brought into rotation by the drive device.

In a preferred embodiment of the invention, the sensor unit has the following technical features:

a sensor arranged on the housing element,

at least one signal generator arranged on the lubricant distribution element,

wherein the sensor and the signal generator are cooperatively configured such that at least one signal can be formed in the sensor by the signal generator every revolution of the lubricant dispensing element.

Such an embodiment is particularly simple and therefore not prone to error. A variety of sensors and signal types may be used.

A particularly preferred embodiment of the invention comprises at least one second signal generator which is arranged on the lubricant distribution element so that at least one different signal can be formed in the sensor per revolution of the lubricant distribution element. This enables a better sensor signal to be formed, which can be evaluated in a simple and reliable manner.

In a preferred embodiment of the invention, the sensor is configured as a magnetic sensor, in particular as a hall sensor, and the one or more signal generators are implemented as permanent magnets. This type of component is strong and inexpensive and furthermore enables a compact embodiment. This can provide a reliable and compact lubricant dispenser. Preferably, the lubricant distribution element has a base body in which one or more signal generators are embedded.

In a preferred embodiment of the invention, the lubricant distribution element and the housing element are embodied and arranged with the sensor and one or more of said signal generators being arranged on the lubricant distribution element or the housing element such that in the respective angular position of the lubricant distribution element the signal generator is at a minimum distance from the sensor. It is further preferred that the sensor and the one or more of said signal generators are arranged at the same radial distance with respect to the rotational axis of the lubricant dispensing element. In this way, a signal that can be reliably detected can be produced in the sensor in a simple design, and the lubricant distributor can be implemented in a particularly compact manner.

In a preferred embodiment of the invention, the two permanent magnets are arranged such that their magnetic fields are oriented opposite each other in terms of the position of the sensor. This means that, for example, one of the permanent magnets points with its north pole in the direction of the sensor in the axial direction, in contrast to the other permanent magnet points with its south pole in the direction of the sensor. The permanent magnets in the magnetic sensor thus form signals of the same size of the different signs in the sensor, whereby the signal-to-noise ratio is improved and a particularly well-evaluable sensor signal is formed. Preferably, the permanent magnets or the signal generator as a whole are arranged opposite each other and at radial intervals with respect to the axis of rotation of the lubricant distributor.

Another preferred embodiment of the invention provides a cavity lubrication device for lubricating an inner surface of a substantially cylindrically shaped hollow body, having a lubricant distributor according to the invention. Hollow bodies of this type can be shaped, for example, cylindrically or essentially cylindrically, but can also have other geometries, for example rectangular, 4-sided, 6-sided or oval.

Other preferred embodiments of the present invention have the following technical features:

at least one sealing surface element is provided,

the lubricant dispensing element is provided with a lubricant dispensing device,

wherein the sealing surface element and the lubricant distribution element are arranged such that a gap is formed between the sealing surface element and the lubricant distribution element,

at least one sealing element arranged in a sealing manner in the gap.

The known lubricant distributor has an annular gap between the inner wall of the lubricant distributor element and, for example, the outer wall of the housing, which gap can be of different dimensions depending on the embodiment. This is irrelevant in normal applications, i.e. in rotary, downwardly directed lubrication heads, since the lubrication heads in most cases carry oil and other fluid lubricants into the passages or through-holes of the oil when they come into contact with the lubrication heads and are thrown out. For a stationary lubrication head, any remaining oil may flow out through the same channels. However, the lubricant distributor according to an embodiment of the invention allows an operation in which the lubricant distribution element is directed upwards or sideways. Lubricant that may enter the gap downwards is then blocked by the seal on the outlet of the lubricant distribution element. The same applies to the storage of lubricant dispensers that are not in operation. In this regard, position-independent operation and position-independent storage can be achieved in a non-rotating lubricant distribution element without the lubricant being discharged from the distributor unintentionally.

In a preferred embodiment of the invention, the sealing surface element is embodied as a housing element. Still other embodiments are possible in which the shaft itself functions as the sealing surface element.

In a preferred embodiment of the invention, the lubricant distribution element has a groove in which the sealing element is held. This makes it possible to fix the sealing element reliably in a simple manner while the embodiment is compact.

In a preferred embodiment of the invention, the housing element has a groove in which the sealing element is held. The same advantages are achieved thereby.

In a preferred embodiment of the invention, the sealing element is embodied as a groove sealing ring. The groove sealing ring can be obtained as a component in various embodiments and can be used firmly and reliably.

In a preferred embodiment of the invention, the groove sealing ring has the following technical features:

the basic body in the form of a ring,

a side extending substantially axially from the base body, said side being configured for abutment against a groove bottom of the groove,

a side edge extending obliquely from the base body relative to the axial direction, said side edge having a sealing edge configured for abutment against a sealing surface of the sealing element, which surface at least partially defines the gap.

The corresponding embodiment is particularly compact, since the groove sealing ring can be embodied particularly narrowly.

In a preferred embodiment of the invention, the sealing element is made at least in part of NBR (nitrile rubber), polyurethane, FPM (fluororubber), VMQ (methyl vinyl silicone rubber) or PTFE (polytetrafluoroethylene).

In several known embodiments, the lubricant inlet is embodied in a lubricant distributor element of generally cup-shaped design, so that the lubricant is introduced into the rotating lubricant distributor element from obliquely behind by means of an ejector. The syringe is embodied here as a separate structural unit and must be held manually or fastened externally to the housing element. Preferably, the lubricant distributor comprises at least one lubricant line through which lubricant can be introduced into the lubricant distributor element. In a further preferred embodiment of the invention, the at least one lubricant line is embodied as a lubricant channel extending in the housing element. This can provide a particularly strong, simple and compact unit, since the lubricant inlet extends in the housing itself. The operation is significantly simplified and, depending on the embodiment, is substantially automated.

Preferred embodiments of the present invention further include the following technical features:

the lubricant distributor element and the housing element are embodied and arranged such that a cavity is formed between them, which transitions into the gap, into which the lubricant can be introduced via the lubricant line, and

at least one lubricant distribution channel is formed in the lubricant distribution element, into which lubricant in the cavity can be introduced,

the lubricant distribution channel is configured such that lubricant located in the lubricant distribution channel can be discharged from the lubricant distribution element by rotation of the lubricant distribution element.

This provides a firm unit with which the lubricant can be distributed particularly evenly. The lubricant distribution channel is constructed in that the distribution of lubricant inside the lubricant distribution element is achieved only by centrifugal forces caused by rotation. The lubricant distribution channel is embodied such that lubricant is discharged from the cavity into the lubricant distribution channel and subsequently discharged by centrifugal force.

Drawings

Further advantages, technical features and details of the invention are given by the following embodiments of the invention with the aid of the accompanying drawings. In the drawings:

figure 1 shows a lubricant dispenser according to one embodiment of the invention,

figure 1a shows an enlarged view of a partial region of the lubricant distributor according to figure 1,

FIG. 1b shows an enlarged view of a partial region of the lubricant distributor according to FIG. 1, and

fig. 2 shows a further sectional view of a partial region of the lubricant distributor according to fig. 1.

Detailed Description

Fig. 1 shows a lubricant distributor in the form of a rotary lubricator 1, which is a preferred embodiment of the invention. The rotary lubricator 1 has a plurality of different interconnected components. The drive unit 3, the lubricant supply unit 5, the connection unit 7, the support unit 9, the receiving unit 11 and the lubrication unit 13 are referred to here. The individual components are described in detail with reference to the following figures.

Fig. 1a shows an enlarged view of a partial region of the rotary lubricator 1 according to fig. 1. The drive unit 3 comprises a housing 21 which is closed by means of bolts 23 by a housing cover 22. In the selected cross-section only two of the bolts 23 are shown. A motor 24 is disposed in the housing 21. The lubricant supply unit 5 is connected to the housing 21 by means of bolts 23' opposite the housing cover 22, only one of which is shown in the selected sectional view. In the lubricant supply unit 5, a connection 31 is provided, to which a lubricant supply device, not shown here, in the form of an oil cartridge, an oil pump or another oil line can be connected. The lubricant channel 32 leads from the joint 31 to a coupling 33 sealed by means of an O-ring.

The connection unit 7 is fixed to the lubricant introduction unit 5 by means of bolts 23 ". The connection unit comprises a housing 41 which is embodied in an elongated manner and whose length varies depending on the embodiment of the rotary lubricator 1, i.e. can be embodied either long or short and is only partially shown in fig. 1 a. Said length essentially determines the distance between the drive unit 3 and the lubrication unit 13. A lubricant tube 48 is provided in the lubricant supply unit 5, the length of which tube is adapted to the housing 41. A lubricant pipe 48 is arranged in the coupling 33 and serves to convey lubricant from the lubricant channel 32 to the bearing unit 9. Furthermore, the connection unit 7 comprises a shaft 44 which is coupled to a shaft end (Wellenstummel) 25 of the motor 24 by means of a spring 46. The spring 46 can in this case transmit torque from the shaft end 25 to the shaft 44 and cause the shaft to rotate. The length of the shaft 44 is adapted accordingly to the length of the connection unit 7. Furthermore, the connection unit 7 comprises a bolt 47 which is held in the receptacle 34. The connection unit is used to fix the support unit 9, which is explained in connection with fig. 1 b.

Fig. 1b shows an enlarged view of a further partial region of the rotary lubricator according to fig. 1. The support unit 9 comprises a housing 51 having the same diameter as the housing 41, but also comprises a section 52 having a smaller diameter, so that the two

housings

41 and 51 can nest and be fixed to each other in the radial direction. Adjoining the housing unit 11 is a housing unit which is screwed from itself to the housing 51 by means of a screw 23' ". At the end of the rotary lubricator 1 there is a lubrication unit 13, the structure and function of which is shown in detail in accordance with fig. 2.

Two roller bearings 52 rotatably supporting a shaft 53 are held in the bearing unit 9. Alternatively, embodiments with one roller bearing or more than two roller bearings, or even sliding bearings, are also possible. The end of the shaft 53 on the right in the drawing extends through the accommodation unit 11 and protrudes outward at its end. The lubrication unit 13 is here interconnected with the shaft 53. For this purpose, the shaft 53 has a cylindrical through-opening 63 at the end, which is adapted to a through-opening 64 in the base body 61 of the lubrication unit 13. The bolt 65 is screwed into the screw 66 partially formed in the through hole 64, thereby fixing the base body 61 at the end of the shaft 53. Alternatively, a safety pin or spring may be provided instead of the bolt 65. The length of the through-hole 64 is matched to the size of the bolt 65 so that no unbalance is created, i.e. no rapid rotation of the base body 61 is adversely affected by geometrical asymmetry. Furthermore, two radially circumferential grooves 67 are formed at one end of the shaft 53, in each of which a rubber ring 68 is arranged. The rubber ring 68 is larger in terms of its diameter than the depth of the groove 68 so that the rubber ring easily protrudes from the groove. The rubber ring 68 forms an operative connection with a corresponding through-hole 69 of the base body 61 and enables a seamless connection and centering.

The shaft 53 has a flattened end 54 at the other end, which engages into the shaft 44 and has a flattened receptacle 43 at the corresponding end. Alternatively, the end 54 may have other geometries, such as hexagonal, to effect torque transfer. As described above in connection with fig. 1a, shaft 44 is connected to shaft end 25 of motor 24. Once motor 24 causes shaft end 25 to rotate, the rotation is transferred to shaft 44 by spring 26 and to shaft 53 through the trimmed end of shaft 44. The lubrication unit 13 can in turn be caused to rotate by means of said shaft 53. For fixing the support unit 9, a thread 55 for the screw 47 is provided. As described above, the bolts are introduced into the lubricant introduction unit 5 through the receiving portions 34 and screwed into the threads 55 of the support unit 9, whereby the support unit is tensioned in the axial direction with respect to the connection unit 7 and thereby fixed. Hereby is provided a simple, stable and length changeable spin injector by replacement of the connection unit 7.

Opposite the bolt 47 is arranged a lubricant pipe 48. The coupling 33 is connected to a lubricant channel 56 in the bearing unit 9. The lubricant channel 56 is connected to a lubricant channel 62 in the receiving unit 11. The lubricant duct 62 extends firstly in the outer region of the receiving unit 11 and then extends obliquely outwards, here away from the illustrated sectional view. The lubricant channel extends radially further inwards in a section 60 of the receiving unit 11 (shown in broken lines) having a smaller diameter. The lubricant can be transported from the joint 31 to the lubrication unit 13, which is described in detail in fig. 2.

In fig. 2, a sectional view of the receiving unit 11 and the lubrication unit 13 is shown in a rotated position relative to fig. 1 and 1 b. A cavity 70 is formed between the housing unit 11 and the lubrication unit 13 by the cup-shaped basic shape of the basic body 61 of the lubrication unit 13 and the partly covered rim of the housing unit 11. The subsequent course of the lubricant duct 62, which has an open end 69 at the end of the receiving unit 11, is only schematically shown in the lower region of the receiving unit 11. Through this open end 69 lubricant, in this embodiment oil, can be fed into the cavity 70. The oil is brought into contact with the wall 71 of the lubrication unit 13 by the small distance between the end 69 and the opposing base body 61. The oil is introduced only during operation of the rotary lubricator, i.e. when the base body 61 rotates relative to the receiving unit 11. The oil is evenly distributed over the wall 71 and transported radially outwards by the centrifugal forces acting. The base body 61 has two radially outer, obliquely outwardly extending lubrication channels 72 which terminate radially outwardly at openings 73 in the base body 61. It is also possible to configure more lubrication channels in the circumferential direction of the base body 61, for example a total of four or six lubrication channels.

Due to the inclined extension of the lubrication channel 72 and the centrifugal forces acting, the oil is further transported along the lubrication channel 72 and released outwards through the openings 73. This allows the oil to be uniformly coated on the inside of a component, such as a cartridge. The rotary lubricator 1 is for this purpose moved in axial direction during the application of the oil.

In the usual use case of known rotary lubricators, the lubrication unit 13 is directed downwards, so that the oil is additionally pulled downwards by gravity. The base body 61 has an open end 75 in view of its structurally cup-shaped design. An annular gap 78 is formed between the inner wall 76 of the base body 61 and the opposing wall 77 of the section 60. If the rotary lubricator is turned off, oil remains in the cavity 70 and lubrication channel 72 at all times. When the lubrication unit 13 is directed downwards, the oil remains there and is thrown out the next time it is used. However, if the rotary lubricator is supported such that the lubrication unit 13 faces upwards or sideways, the lubricant flows in the direction of the open end 75 towards the annular gap 78 and out of the rotary lubricator in the known embodiment, which may lead to contamination. In order not to allow residual oil to pass from the cavity 70 through the annular gap 78 to the open end 75 and thus into the environment, a groove sealing ring 79 is arranged in the annular gap 78. The groove sealing ring is made of nitrile rubber (NBR) or other known sealing materials, such as elastomers, PTFE or fluorinated elastomers, for example. The groove sealing ring 79 has an annular base element 80 against which an axially extending seal 81 abuts. The seal is held axially in a correspondingly sized groove 82 in the base body 61. Oppositely, a sealing element 83 extending obliquely is arranged on the base element 80, on the end of which a sealing edge 84 is formed. The sealing edge is arranged in a sealing manner against the wall 77 after installation, so that oil cannot flow out of the cavity 70. In this way, the rotary lubricator 1 can be mounted in any position when not in operation, i.e. it is not possible to drain oil even with the lubrication unit 13 pointing upwards. On the other hand, the groove seal ring 79 prevents intrusion of foreign matter into the cavity 70.

In contrast to the embodiment of fig. 2, the arrangement of the groove sealing ring 79 can also be adjusted in the radial direction, i.e. the groove can be formed in the wall 77, while the groove sealing ring 79 can be held in the groove and sealed against the wall 76 by means of a sealing edge.

Instead of the groove sealing ring 79, other seal types, such as radial shaft seals or labyrinth seals, may also be provided in alternative embodiments.

By further showing a sensor 90 in fig. 2, said sensor is arranged on the end of the receiving unit 11 and protrudes into the cavity 70. The sensor 90 is embodied, for example, as a hall sensor, i.e. it is able to detect a changing magnetic field. In the base body 61 of the lubrication unit 13, the cylindrical first magnet 91 is arranged flush with the wall portion 71. In the drawing of fig. 2, the first magnet is positioned opposite to the sensor 90. The magnet 91 is fixed to the base body 61 by an adhesive. For assembly, an adhesive is applied in the corresponding recess 92 of the lubrication unit 13 and the magnet 91 is pressed into the recess 92. In order to transfer excess adhesive, the recess 92 continues into a channel 93, which is then closed by the adhesive that has penetrated. When the lubrication unit 13 rotates relative to the receiving unit 11, the magnet 91 is in the position shown every revolution, so that the sensor 90 is only temporarily in the magnetic field and thus a corresponding sensor signal is formed. The formed periodically varying sensor signal is processed in an evaluation unit 95 and transmitted via a signal line 96 to a control unit 96, which is arranged in the drive unit 3 (see fig. 1 a). For this purpose, the signal line 96 extends through the bearing unit 9, the connection unit 7, the lubricant supply unit 5 and the drive unit 3 via a plurality of sections that can be connected to one another.

A further magnet 97 is arranged in the base body 61 of the lubrication unit 13, said further magnet being radially opposite the magnet 91. This is achieved in that the sensor signal is changed twice per revolution of the lubricant unit 13. The magnet 97 is held on the base body 61 by an adhesive similarly to the magnet 91. To change the signal-to-noise ratio, the magnets 91 and 97 are arranged opposite each other with respect to their magnetic fields, i.e. for example, in the view of fig. 2 the magnet 91 has the north pole arranged to the left and the magnet 97 has the north pole arranged to the right. Thus, in the sensor 90, the lubrication unit 13 triggers a positive signal once per revolution and triggers a negative signal of the same value once. The signal profile can be evaluated particularly reliably. Furthermore, by evaluating the signal it can also be ascertained that the lubrication unit 13 is still located on the shaft 53, that is to say not released, and that the lubrication unit 13 is actually in rotation. If no signal can be detected by means of the sensor 90, a problem with the lubrication unit 13 or the motor 24 can be deduced, since the lubrication unit 13 either does not rotate or even does not exist at all. In both cases corrective intervention is required. The control unit 26 continues to signal the corresponding processing to an operating unit, not shown, on which the correct and fault state is shown during operation. The current rotational speed of the lubrication unit 13 can also be detected by evaluation of the sensor signal.

The components shown in the figures are shown in part in the device for clarity, and may also be arranged differently from one another in a practical embodiment. The operating principle on which the components are based is not necessarily changed, however. Furthermore, aspects of the embodiments shown herein may be addressed differently in terms of construction without giving up the advantages of the invention.

In alternative embodiments, the lubrication unit 13 may have a larger or smaller diameter than shown here in order to be adapted to different application situations. In a usual embodiment, use is made of a lubrication unit 13 having an outer diameter of between 20 and 80 mm. The diameter of the remaining components does not have to be changed here. A modular assembly can be provided in which the connection units 7 of different lengths and the lubrication units 13 of different sizes can be individually assembled while using as many identical components as possible.

List of reference numerals

1. Rotary oilcan

3. Driving unit

5. Lubricant introducing unit

7. Connection unit

9. Support unit

11. Housing unit

13. Lubrication unit

21. Shell body

22. Shell cover

23. 23', 23' bolt

24. Motor with a motor housing

25. Shaft end

26. Control unit

31. Joint

32. Lubricant passage

33. Coupling device

34. Housing part

41. Shell body

43. Housing part

44. Shaft

46. Spring

47. Bolt

48. Lubricant tube

51. Shell body

52. Segment(s)

53. Shaft

54. End portion

55. Screw thread

56. Lubricant passage

60. Segment(s)

61. Base body

62. Lubricant passage

63. 64, 69 through holes

65. Bolt

66. Screw thread

67. Groove(s)

68. Rubber ring

70. Cavity cavity

71. Wall portion

72. Lubrication channel

73. Perforating the hole

75. End portion

76. 77 wall part

78. Annular gap

79. Groove sealing ring

80. Base element

90. Sensor for detecting a position of a body

91. 97 magnet

92. Groove

93. Channel

Claims

1. A lubricant dispenser having the following technical characteristics:

at least one of the housing elements is provided with a housing element,

a sensor unit configured to be able to detect a rotation of the lubricant distribution element relative to the housing element, wherein the lubricant distribution element further has a shaft rotatably arranged in the housing element, on which shaft the lubricant distribution element is held, wherein the shaft is connected to the drive device and is able to be rotated by the drive device, wherein the lubricant distribution element has a base body with a wall on which the lubricant is distributed evenly and conveyed radially outwards by an acting centrifugal force when the base body is rotated relative to the housing.

2. The lubricant dispenser of claim 1, wherein the sensor unit has the following technical features:

a sensor arranged on the housing element,

at least one signal generator arranged on the lubricant distribution element,

3. The lubricant dispenser of claim 2, further having at least one second signal generator disposed on the lubricant dispensing element so as to be able to form at least one other signal in the sensor for each revolution of the lubricant dispensing element.

4. The lubricant dispenser of claim 2, wherein the sensor is configured as a hall sensor and the one or more signal generators are implemented as permanent magnets.

5. The lubricant dispenser of claim 2, wherein the lubricant dispensing element has a base body in which one or more signal generators are embedded.

6. A lubricant dispenser according to claim 2, wherein the lubricant dispensing element and the housing element are embodied and arranged, and the sensor and one or more of said signal generators are arranged on the lubricant dispensing element or the housing element, such that in the respective angular positions of the lubricant dispensing element the signal generator is at a minimum distance from the sensor.

7. The lubricant dispenser of claim 2, wherein the sensor and one or more of the signal generators are arranged at the same radial spacing relative to an axis of rotation of the lubricant dispensing element.

8. The lubricant dispenser of claim 4, wherein two permanent magnets are arranged such that their magnetic fields are oriented opposite each other in terms of the position of the sensor.

9. A cavity lubrication device for lubricating an inner surface of a hollow body, having a lubricant dispenser according to any one of claims 1 to 8.