DE102007058752B4 - Travel drive for a switching device and switching device with such a travel drive - Google Patents

Abstract

Traversing drive for a switching device (102), wherein the traversing drive by means of a hand crank (10) operable drive shaft (3) having a worm shaft (4) arranged thereon, wherein the worm shaft (4) in an outer toothing (64) of a worm wheel (5) for driving a Verfahrwelle (9) engages and wherein the Verfahrwelle (9) is provided for moving the switching device,
characterized,
- that the worm wheel (5) has a Schneckenradnabe (8) for driving the Verfahrwelle (9) and a worm wheel hub (8) coaxially embracing gear rim (6),
- That the external toothing (64) of the gear rim (6) has an untoothed recess (65) whose length in the circumferential direction is at least as large as the axial length of the constantly meshing teeth of the worm shaft (4) and
- That in the worm wheel (5) a spring element (7) for generating a restoring force upon rotation of the Schneckenradnabe (8) relative to the gear rim (6) is arranged, so that the worm shaft (4) by the restoring force at the ...

Description

The The invention relates to a positioning drive for moving a switching device, wherein the traversing an actuatable by means of a hand crank drive shaft having a worm shaft disposed thereon. The worm shaft engages in external teeth a worm wheel for driving a Verfahrwelle. The travel shaft is to move the switching device intended.

The The invention further relates to a switching device with such a travel drive.

Such travel drives and switching devices with such a drive drive are for example from the German patent application DE 10 2004 026 269 A1 or from the published international application WO 02/087040 A1 known.

The known traversing drives serve a switching device, in particular a circuit breaker, within a rack of a switching cell or a control cabinet. The insertion frame can z. B. be designed as a slot. The known switching devices are for switching off currents in the range of 630 A to 6000 A designed. The respective inserted switchgear has a traversing mechanism, which in such a way with the insertion frame cooperates, that the switching device relative to this proceed can be. Thereby can fixed to the switching device attached main isolating contacts with switch cell side busbars a control cabinet or a control panel are contacted. With their words, the switching device in a separate position or be moved into an operating position of the switching device. The switching device can, for example parallel to the insertion direction of the switching device in the slot frame by means be moved of the traversing drive. It can alternatively be vertical be moved to the insertion direction.

Often points the travel drive housed in a gear housing worm gear on. The worm gear comprises one by means of a hand crank drivable drive shaft with a worm shaft arranged thereon and a worm wheel. The worm shaft is engaged with an external toothing of re its axis of rotation perpendicularly arranged worm wheel. The Worm gear allows a high translation, so that the main isolating contacts on the switching device, the switch cell side Busbars with high contact force can. The permissible rotation angle range the worm wheel is limited by a stop, which for example formed by mold elements on the worm wheel and the gear housing becomes.

Versus End of the "cranking" of the Separate position in the operating position, the worm wheel moves against the gearbox side stop. If the operator of the switching device now trying to turn the hand crank with high muscle power, occur because of the large gear ratio of the worm gear on very high mechanical forces. These forces can then for shearing the worm shaft, for breaking a gearing or lead to the breakage of the stop.

to To avoid this problem it is known the components of the drive train constructively interpreted to mean that when driving the positioning drive be tolerated forces occurring against the stop. This means disadvantageous that the relevant components made of high quality steel must be made. The components in question are production and costly turned and milled parts.

outgoing From the above-mentioned prior art, it is an object of the invention, a less susceptible one and cheaper specify traversing drive to be produced.

It is a further object of the invention, a suitable switching device, in particular specify a circuit breaker with such a drive drive.

The The object of the invention is with a travel drive to the process a switching device with the features of claim 1 solved. Advantageous embodiments the traversing drive are in the dependent claims 2 to 6 called. In claim 7 is a switching device with such a travel drive specified. In claim 8, an embodiment of the switching device is called.

According to the invention the worm gear is a worm wheel hub for driving the travel shaft and a gear rim coaxially surrounding the worm wheel hub on. The external teeth of the Gear rim has an untoothed recess whose length in the circumferential direction at least that big like the axial length constantly engaged teeth the worm shaft. In the worm wheel is a spring element for generating a Restoring force at a rotation of the worm wheel relative to the gear rim arranged so that the worm shaft by the restoring force utter Crank in the untoothed recess against the last abandoned Engagement tooth is pressed in the sense of a slip clutch.

As a result, a mechanical decoupling of the hand cure takes place automatically towards the end of the cranking as well as towards the end of the cranking out bel from the travel shaft for moving the switching device.

There Due to the mechanical decoupling no translated high forces more can arise Now, the worm shaft can be advantageously made from a cost effective Zinc die-cast or plastic, such. B. made of polyamide become. Furthermore, the worm wheel can advantageously from a Die-cast zinc or plastic instead of sintered steel getting produced. Furthermore can the gearbox, in which usually the attacks are formed as moldings, made of a plastic instead of a zinc diecasting be made. This reduces the Production costs and the weight for the traversing drive according to the invention dramatically.

Of the special advantage is that the dimensioning and / or the material selection purely on the mechanical transfer function and not on those caused by a faulty operation of the operator personnel and moments are done.

One Another advantage is that the operator of the switching device during Cranking a tactile feedback as well as an acoustic feedback in the form of a "click-click" sound when the Worm shaft is no longer engaged with the worm wheel.

To an embodiment the spring element is a coaxial between the worm wheel hub and the sprocket arranged torsion spring. This simplifies itself the structure of the combined worm wheel. The worm wheel hub and sprocket are in the unbiased state in a tangential zero position. From this zero position can then the worm wheel in both the one and the other direction against the return spring force be twisted relative to the ring gear.

To a further embodiment are the Schneckenradnabe and the gear rim by means of at least an axially extending Federmitnehmers connected, each engages in a corresponding tangentially extending Federmitnehmernut. With "tangential" are directions designated around the Schneckenraddrehachse around.

Especially The torsion spring according to a further embodiment, a first and second spring end on. The spring end pieces are biased at each tangential contact surface in the Worm wheel hub on. There are two spring drivers in the sprocket like this arranged that these relative to the rotation of the Schneckenradnabe Gear rim the respective tail from its respective contact surface for generating the spring restoring force take off.

With In other words, only with increasing Drezirk steering of the worm wheel deflected relative to the ring gear, the respective spring end and about this a torsional force, that is, restoring force, exercised on the sprocket, until a corresponding fixed stop for positive entrainment the sprocket is reached. As a result, the torsion spring is on particularly simple manner in the worm wheel mountable.

one another embodiment According to the worm wheel hub has at least one axially extending Hub driver, which in each case in a corresponding tangential extending hub cam groove engages. The hub driver groove forms at its two tangential ends in each case a stop for the Nabenmitnehmer out. The hub driver groove has such a measured tangential Slot length on that the worm wheel hub and the gear rim only one maximum predefinable angle of rotation against the spring element or the Torsion element are rotatable. With "axial" directions are parallel to the worm wheel rotation axis. By "hub driver" is meant that the hub of the worm wheel with rotation of the ring gear at rotating operation the worm shaft "taken" is.

Of the Angle of rotation is chosen in particular so that a mechanical Coupling between worm shaft and worm wheel when cranking only then takes place when a minimum number of worm shaft gears, such as z. B. three, in engagement with the external toothing of the gear rim is. In a corresponding manner, the mechanical coupling takes place during Out cranks.

Of the at least one hub driver can axially on a gear rim opposite Side be arranged and each in a corresponding axially opposite Engage hub driver groove. Alternatively or additionally the at least one hub driver on one of the worm wheel hub axially opposite Side be arranged and each in a corresponding axially opposite Engage hub driver groove. The at least one hub driver is preferably an axially extending pin-shaped formation on the Schneckenradnabe or on the gear rim, wherein the respective Hub driver radially spaced from the worm wheel axis of rotation.

Another embodiment of the invention, the predetermined angle of rotation between the worm wheel and the gear rim at least as large as the angle which corresponds to the Bo genlänge extending in the circumferential direction of the ring gear untoothed recess. Thereby it is ensured that the worm shaft decouples safely with the worm wheel during cranking. In addition, additional stops may be present in the switching device to form a "hard" stop for the travel drive. Such attacks limit the rotational movement of the Verfahrwelle, if it is z. B. due to impermissibly high vibrations should lead to a tooth offset between the worm wheel and the worm shaft.

The The object of the invention will continue with a switching device for insertion in a slot frame of a switching cell of a control cabinet or a cubicle solved. The switching device points a traversing drive according to the invention for moving the switching device relative to the drawer frame. Such a switching device is cheaper manufacturable and opposite improper treatment less vulnerable.

The Switching device according to the invention is preferably a circuit breaker for switching off an overcurrent or a short-circuit current.

The Invention as well as advantageous embodiments of the invention further described below with reference to the following figures. Show it

1 a front view of a recorded in a drawer frame a switchgear switching device with a hand crank of a travel drive,

2 a sectional view of a traversing drive according to the invention along a drive shaft rotation axis and perpendicular to a Schneckenraddrehachse at the end of cranking the positioning drive,

3 a sectional view of the travel drive according to

2 at the beginning of the cranking out of the travel drive,

4 a perspective view of a worm wheel of the positioning drive according to the invention,

5 a perspective view of a Schneckenradnabe with recorded biased torsion spring,

6 3 is a perspective view of a sprocket with, by way of example, two spring drivers for engaging in a respective spring end piece;

7 . 8th Sectional views of the worm wheel of the positioning drive according to 4 and

9 a perspective view of the worm wheel according to 7 and 8th ,

1 shows a front view of a in a drawer frame 101 a switching cell recorded switching device 100 with a winch 10 a positioning drive 1 ,

The slide-in frame shown 101 For example, it can be mounted in a control cabinet. In the example of 1 is the switching device 100 a circuit breaker. With the reference number 102 is a control panel of the circuit breaker 100 designated. With the reference number 103 is called an overcurrent detection unit, which is an unillustrated switch lock of the circuit breaker 100 in the event of overcurrent or short circuit. A hand-lift lever 107 serves for tensioning a spring accumulator, which is used for selective switching on of the circuit breaker 100 medium of a switch-on button 105 can be released. To switch off the circuit breaker 100 is the button 104 intended. Above the buttons 104 . 105 arranged indicator lamps show the switching and operating status of the circuit breaker 100 at.

In the lower part of the 1 is a travel drive 1 for moving the switching device 100 relative to the insertion frame 101 to see. The travel drive 1 has one about a worm shaft rotation axis 21 rotatable winch 10 on, by means of a worm shaft can be driven, which in turn drives a not visible in this illustration worm wheel. This worm wheel drives one in the present 1 only partially illustrated traverse shaft 9 at. It is an example at both axial ends of the Verfahrwelle 9 one gear each 108 mounted, which in each case engage with a insertion frame side rack 109 are. The switching device 100 then moves according to the direction of crank rotation in the image plane shown 1 into or out of this.

2 shows a sectional view of a positioning drive according to the invention 1 along a drive shaft axis of rotation 21 and perpendicular to a Schneckenraddrehachse 24 at the end of cranking the positioning drive 1 ,

The in the left part of the 2 illustrated hand crank 10 has a hand crank arm 11 and a handle 12 on. The torque applied via an operator becomes when the traversing drive is being driven in or out 1 over the drive shaft 3 on the worm shaft 4 transfer. The latter is in engagement with an external toothing 64 a worm wheel 5 , which the rotary motion with high Translation, that is with high torque, on a Verfahrwelle 9 transfers. The aforementioned components 3 to 5 are in a housing 2 of the travel drive 1 accommodated. It is illustrative for the cranking process the corresponding worm shaft and Schneckenraddrehrichtung 22 . 23 located. The travel shaft 9 has an example of a profile opening of the worm wheel 5 matched outer contour in the form of a splined shaft. The travel shaft 9 is preferably guided on both sides by the profile opening. It can also be driven only on one side. With the travel shaft 9 is connected to a movement mechanism, not shown, which is used to move the switching device 102 is provided. The travel mechanism may, for example, toothed disks, pushrods, cranks or the like.

According to the invention, such a worm wheel 5 now a worm wheel hub 8th for driving the travel shaft 9 and a worm wheel hub 8th Coaxially enclosing gear rim 6 on.

In the present presentation as well as in the following 3 is from the worm wheel hub 8th only one axial hub end 84 to see which axially through the gear rim 6 protrudes. The structure of the worm wheel according to the invention 5 is in the following figures 4 to 9 shown in detail.

The external toothing 64 of the gear wreath 6 furthermore, according to the invention has an untoothed recess 65 that is, an untoothed portion, whose length in the circumferential direction is at least as large as the axial distance of the teeth of the worm shaft constantly engaged 4 , As the 2 shows, lies the worm shaft 4 at the end of the cranking process shown entirely in this untoothed recess 65 ,

Furthermore, in the worm wheel 5 According to the invention, a spring element 7 for generating a restoring force during a rotation of the worm wheel hub 8th relative to the gear rim 6 arranged so that the worm shaft 4 by the restoring force when fully cranking in the untoothed recess 65 is pressed against the last left engagement tooth in the sense of a slip clutch.

In the example of 2 The last left engagement tooth is at the left axial end of the worm shaft 4 , The worm wheel hub 8th and the gear wreath 6 are exemplary by means of an axially extending Nabenmitnehmers 82 connected, which in a corresponding tangential hub hub groove 62 intervenes. The hub driver groove 62 has such a measured tangential groove length that the worm wheel hub 8th and the gear wreath 6 only by a maximum predetermined angle of rotation against the spring element 7 or against the torsion element 7 are rotatable. The angle of rotation may be, for example, in a range of 20 ° to 40 °. In the example of the present 2 are the hub drivers 82 each at the right tangential end of the hub driver groove 62 ,

Preferably, the rotational position of the untoothed recess 65 with respect to the traversing mechanism for moving the main isolating contacts of the circuit breaker set such that the mechanical decoupling occurs shortly before the "hard" mechanical stop when the main disconnect contacts are driven against the switch cell side busbars. In other words, the decoupling takes place before an inadmissibly high force between the main separating contacts and the busbars can be applied to the mechanics by the operator.

3 shows a sectional view of the travel drive 1 according to 2 at the beginning of the cranking out of the travel drive 1 ,

As the 3 shows allows the tangential restoring force between Schneckenradnabe 8th and gear wreath 6 in that with the beginning of the cranking out immediately the worm shaft 4 again in the last left engagement tooth of the external teeth 64 of the gear wreath 6 can intervene. The gear rim turns 6 of the worm wheel 5 first a few crank turns "empty", until finally the hub driver 82 to the other tangential end of the respective hub driver groove 62 , that is to the left end, have arrived. Only with the achievement of these ends, the transfer of the hand crank torque to the worm wheel hub takes place 8th and thus over the associated movement shaft 9 on the movement mechanism for moving the switching device.

In a corresponding manner, the end of the Auskurbelvorganges can be limited before the traversing mechanism moves against an internal switching device stop. Preferably, then the untoothed recess 65 such a tangential length that the worm shaft 4 between the remote position and the operating position of the switching device in each case the external teeth 64 just left.

4 shows a perspective view of a worm wheel of the positioning drive according to the invention.

In the left part of the 4 is the worm wheel hub 8th , in the right part of the 4 the gear wreath 6 with the external teeth 64 shown. Between both components 6 . 8th is a coaxial torsion spring 7 arranged as a spring element. With the reference number 87 is called a spring receiving, which in the assembled state of the worm wheel 5 the torsion spring 7 receives. With the reference number 80 is the profile opening for receiving the travel shaft 9 designated. The axial tail 84 the worm wheel hub 8th extends in the assembled state of the worm wheel 5 through a passage opening 60 in the gear wreath 6 therethrough. Thus, both can axially out of the worm wheel 5 outstanding ends of the travel shaft 9 be driven together. In the example of 4 has the worm wheel hub 8th a radial outside 86 on which after assembly of the worm wheel 5 to a radial inside 63 of the gear wreath 6 borders for radial guidance. Furthermore, the worm wheel hub points 5 an example arranged at its axial end and in particular integrally formed circular disc 83 on. This includes, among other things, the worm wheel 5 from the axial side.

To apply a restoring force are the Schneckenradnabe 8th and the gear wreath 6 connected by means of axially extending Federmitnehmer, the latter are not visible in this illustration. The spring drivers engage in corresponding tangential spring driver grooves. The latter do not extend in the axial direction all the way to the axial end face of the gear wheel rim 6 in the sense of a breakthrough. They are therefore also not recognizable in this presentation.

In contrast, in the example of 4 a hub driver 82 with an axial end arranged stop piece 85 to see. He attacks after assembly of the worm wheel according to the invention 5 in a corresponding, up to the axial end face of the gear rim 6 in the sense of a breakthrough hub hub 62 , The hub driver groove 62 forms at its two tangential ends in each case a stop for the Nabenmitnehmer 82 , in particular for the stop piece 85 of the hub driver 82 , out. The hub driver groove 62 has a tangential groove length dimensioned such that the worm wheel hub 8th and the gear wreath 6 only by a maximum predetermined angle of rotation against the spring element 7 or the torsion element 7 are rotatable. In particular, this predetermined angle of rotation is at least as large as the angle which corresponds to the arc length of the circumferential direction of the ring gear 6 extending serrated recess 65 equivalent.

5 shows a perspective view of a Schneckenradnabe 5 with absorbed preloaded torsion spring 7 ,

The shown worm wheel hub 8th has a coaxial torsion spring arranged 7 with a first and second spring end piece 71 . 72 on. The spring end pieces 71 . 72 are biased at each of a tangential contact surface 68 in the worm wheel hub 8th at. With the reference number 61 are two tangentially extending Federermitnehmernuten designated, in each of which a corresponding spring driver 81 of the sprocket 6 engage such that this upon rotation of the Schneckenradnabe 8th relative to the gear rim 6 the respective tail 71 . 72 from its respective contact surface 68 can lift off to produce the spring restoring force. In the example of 5 would therefore be one of the spring end pieces 71 . 72 be moved towards the other. Furthermore, the spring driver grooves 61 as well as the spring takers 81 geometrically coordinated so that the worm wheel hub 8th and the sprocket 6 tangentially guided and at the same time fixed radially to each other.

With the reference number 82 a hub driver can be seen, which in a corresponding tangential hub hub groove 62 can intervene. This is in the example of 6 to be seen in detail.

6 shows a perspective view of a sprocket 6 with exemplary two spring takers 81 for engagement in a respective spring end piece 71 . 72 , It became the spring element 7 according to 5 again drawn in the drawing to illustrate how this in the assembled state of the worm wheel 5 would be arranged constructively. In this illustration, it can be seen as the right of the two Federmitnehmer 81 just engaged with the second spring end 72 is while the second spring end piece 71 stuck to the upper right part of the 5 shown contact surface 68 is applied.

Furthermore, the shows 6 the hub driver 82 according to 5 corresponding hub driver groove 62 , It forms at its two tangential ends in each case a stop for the Nabenmitnehmer 82 , that is for the in 5 Shock end piece shown 85 of the hub driver 82 , out. The hub driver groove 62 has such a dimensioned tangential courage length that the worm wheel hub 8th and the gear wreath 6 only by a maximum predetermined angle of rotation against the spring element 7 or the torsion element 7 are rotatable.

7 shows a view of the end face of the gear rim 6 of the worm wheel 5 , In the center of the Scheckenrades 5 is that through the tooth rim 6 passing through axial hub end 84 the worm wheel hub 8th to see. In the lower part of the 7 is the continuous hub driver groove 62 recognizable. In the right part of the 7 is the untoothed recess 65 to see. With the reference numerals 66 . 67 are the tangential ends of the recess 65 designated.

8th shows a section through the worm wheel 5 along the in 7 drawn section line VIII-VIII. In this illustration, the coaxial arrangement of the worm wheel hub 8th embracing gear wreath 6 to see. 8th also shows particularly well the coaxial arrangement of the torsion spring 7 ,

9 shows a perspective view of the worm wheel 5 according to 7 and 8th , 9 shows the compared to 7 axially opposite end face of the worm wheel 5 , In this illustration is a recess 88 in the circular disk 83 for a control cam of the worm wheel hub 8th recognizable. This can be scanned by display means such. B. by means of a cam to indicate the respective switching state of the switch device such as remote position or operating position.

1

movement drive

2

casing

3

drive shaft

4

worm shaft

5

worm

6

ring gear

7

Spring element, Torsion spring, cylindrical spring

8th

worm wheel hub

9

Verfahrwelle

10

winch

11

crank

12

grip

21

Worm shaft axis of rotation

22

Worm shaft rotation direction

23

Schneckenraddrehrichtung

24

Schneckenraddrehachse

25

biasing direction

60

Through opening

61

Federmitnehmernut

62

Nabenmitnehmernut, continuous groove

63

radial Inside of the gear rim

64

external teeth

65

toothless Part, tooth recess

66 67

tangential Ends of the tooth recess

68

contact surfaces

71, 72

with springs

80

Profile opening, central opening

81

Federmitnehmer

82

hub pawl

83

disc

84

axial hub end

85

stop piece

86

radial outside the hub

87

spring mount

88

Cam recess

100

Switching device, circuit breaker,

101

The guide frame, insertion tray

102

control panel

103

Overcurrent detection unit

104 105

Control buttons for main switch

106

Display elements, indicator lights

107

Manual winding lever for spring storage

108

gear

109

rack

Claims (8)

Travel drive for a switching device ( 102 ), wherein the travel drive by means of a hand crank ( 10 ) operable drive shaft ( 3 ) with a worm shaft arranged thereon ( 4 ), wherein the worm shaft ( 4 ) in an outer toothing ( 64 ) of a worm wheel ( 5 ) for driving a travel shaft ( 9 ) and wherein the travel shaft ( 9 ) is provided for moving the switching device, characterized in that - the worm wheel ( 5 ) a worm wheel hub ( 8th ) for driving the travel shaft ( 9 ) and a worm wheel hub ( 8th ) coaxially enclosing gear rim ( 6 ), - that the external toothing ( 64 ) of the gear rim ( 6 ) an untoothed recess ( 65 ) whose length in the circumferential direction is at least as large as the axial length of the teeth of the worm shaft constantly engaged ( 4 ) and - that in the worm wheel ( 5 ) a spring element ( 7 ) for generating a restoring force during a rotation of the worm wheel hub ( 8th ) relative to the gear rim ( 6 ) is arranged so that the worm shaft ( 4 ) by the restoring force when fully cranking in the untoothed recess ( 65 ) is pressed against the last left engagement tooth in the sense of a slip clutch. Traversing drive according to claim 1, characterized in that the spring element ( 7 ) a coaxial between the Schneckenradnabe ( 8th ) and the sprocket ( 6 ) arranged torsion spring is. Traversing drive according to claim 1 or 2, characterized in that the worm wheel hub ( 8th ) and the gear rim ( 6 ) by means of at least one axially extending spring driver ( 81 ), which in each case in a corresponding tangentially extending Federmitnehmernut ( 61 ) intervenes. Travel drive according to claim 2 or 3, characterized - that the torsion spring ( 7 ) a first and second spring end piece ( 71 . 72 ), - that the spring end pieces ( 71 . 72 ) biased at each of a tangential contact surface ( 68 ) in the worm wheel hub ( 8th ) and - that two spring takers ( 81 ) in the sprocket ( 6 ) are arranged such that these upon rotation of the Schneckenradnabe ( 8th ) relative to the gear rim ( 6 ) the respective tail ( 71 . 72 ) from its respective contact surface ( 68 ) to raise the spring restoring force. Traversing drive according to one of the preceding claims, characterized in that the worm wheel hub ( 8th ) at least one axially extending hub driver ( 82 ), which in each case in a corresponding tangential hub hub groove ( 62 ) engages that the hub driver groove ( 62 ) at its two tangential ends in each case a stop for the hub driver ( 82 ) and that the hub driver groove ( 62 ) has a tangential groove length dimensioned such that the worm wheel hub ( 8th ) and the gear rim ( 6 ) only by a maximum predetermined angle of rotation against the spring element ( 7 ) or the torsion element ( 7 ) are rotatable. Traversing drive according to claim 5, characterized in that the predefinable angle of rotation between the worm wheel hub ( 8th ) and the gear rim ( 6 ) is at least as large as the angle which the arc length of the circumferential direction of the ring gear ( 6 ) running uncut recess ( 65 ) corresponds. Switching device for insertion into a slide-in frame ( 101 ) a switching cell of a control cabinet ( 100 ) or a control panel, characterized in that the switching device is a traversing drive ( 1 ) for the operation of main isolating contacts of the switching device according to one of the preceding claims. switchgear according to claim 7, characterized in that the switching device is a circuit breaker is.