Tensioning gear for tensioning a storage spring of a spring storage drive

Abstract

The invention relates to a tensioning mechanism (1) for tensioning a pre-loaded spring of a spring-loaded accumulator drive. Said tensioning mechanism (1) comprises a tensioning wheel (9) coupled to the pre-loaded spring, an intermediate shaft (2) coupled to the tensioning wheel (9), an idler gear (4) that can be driven by a clamping motor, a freewheel (3) coupled to the idler gear (4), a locking mechanism (28) for detachably locking the tensioning wheel (9) in a tensioned state of the pre-loaded spring, and a dog clutch (20) that couples the freewheel (3) to the intermediate shaft (2) in order to tension the pre-loaded spring and uncouples same from the intermediate shaft (2) in the tensioned state of the pre-loaded spring.

Description

[0001] Description

[0002] Tensioning gear for tensioning a storage spring of a spring storage drive

[0003] The invention relates to a tensioning mechanism for tensioning a storage spring of a spring storage drive, in particular for a circuit breaker. Spring storage drives are used in particular as drives for

[0004] Circuit breakers are used for switching. Circuit breakers are electrical switches designed for high electrical currents and voltages, particularly to protect against high overloads. ¬ to be able to safely disconnect currents and short-circuit currents. For this purpose, circuit breakers have an interrupter unit with... ¬ at least one movable switching element for opening and

[0005] To open a current path. To move the switching elements during a switching operation, circuit breakers store the energy required for the switching process. Spring-loaded actuators store this energy in storage springs, which are used for

[0006] Energy storage is achieved by tensioning the spring. For example, a storage spring is tensioned using a tensioning motor connected to the spring via a tensioning gear. Similarly, spring storage drives are also used, for example, as drives for switching load break switches.

[0007] The invention is based on the objective of providing an improved tensioning mechanism for tensioning a storage spring of a spring storage drive.

[0008] The object of the invention is achieved by the features of the ¬ Proposition 1 solved.

[0009] Advantageous embodiments of the invention are the subject of the dependent claims.

[0010] A tensioning device according to the invention for tensioning a spoke ¬ The spring of a spring storage drive comprises a tensioning wheel coupled to the storage spring, a tensioning wheel connected to the tensioning wheel ¬ The system consists of a coupled intermediate shaft, an intermediate gear driven by a tensioning motor, a freewheel coupled to the intermediate gear, a locking mechanism for releasably locking the tensioning wheel in a tensioned state of the accumulator spring, and a jaw coupling that couples the freewheel to the intermediate shaft for tensioning the accumulator spring and decouples it from the intermediate shaft when the accumulator spring is tensioned. The intermediate shaft transmits power during tensioning of the accumulator spring.

[0011] Rotations of the intermediate gear via the freewheel and the claws ¬The coupling engages the tensioning wheel, thereby enabling the tensioning motor, which directly or indirectly drives the intermediate wheel, to tension the storage spring. The locking mechanism holds the tensioning wheel in the tensioned state of the storage spring. ¬ The accumulator spring can be locked in place, so that the accumulator spring remains tensioned until the lock is released to release the energy stored in the accumulator spring. In the tensioned state of the accumulator spring, the jaw coupling decouples the intermediate shaft from the freewheel and the intermediate gear, so that the intermediate gear, especially during overrun,

[0012] Tensioning motors, no forces on the intermediate shaft and the

[0013] The tensioning wheel is transmitted. Without the claw coupling, these forces would, in the tensioned state of the accumulator spring, be transferred to the intermediate shaft and the component coupled to the intermediate shaft. ¬ Details of the tensioning mechanism, such as components of the locking mechanism ¬The mechanism is transferred and these tensions and burdens ¬ ten. The claw coupling therefore advantageously relieves the intermediate shaft and components of the tensioning gear coupled to it in the tensioned state of the accumulator spring.

[0014] One embodiment of the invention provides that the jaw coupling has a first clutch shoe that is rotationally fixed to the intermediate shaft and a second clutch shoe that is connected to the freewheel, wherein the first clutch shoe is connected between ¬The first clutch shoe is movable between a first end position, in which it rests against the second clutch shoe, and a second end position, in which it is separated from the second clutch shoe and which it assumes when the accumulator spring is tensioned. Due to the rotationally fixed coupling of the first clutch shoe to the intermediate shaft, rotations of the intermediate shaft are transmitted to the first clutch shoe. The movableness of the first clutch shoe enables its coupling to the second clutch shoe and the freewheel associated with it for tensioning the accumulator spring, and the decoupling of the clutch shoes when the accumulator spring is tensioned. For example, the first clutch shoe is connected by a coupling ¬ element coupled to the intermediate shaft, whereby the coupling element ¬ ment through a perpendicular to a longitudinal axis of the intermediate ¬The coupling element is guided in a transverse opening running along the shaft in the intermediate shaft and is displaceable within this opening between a first position, defining the first end position of the first coupling shoe, and a second position, defining the second end position of the first coupling shoe. The coupling element is designed, for example, as a tube or bolt. ¬ The coupling element, whose longitudinal axis is arranged perpendicular to the longitudinal axis of the intermediate shaft and whose ends project into recesses in the first coupling shoe. The coupling element enables ¬The first clutch shoe can be moved by moving the coupling element. Furthermore, a switching pin is provided, for example, which is slidably mounted in a longitudinal opening in the intermediate shaft running along its longitudinal axis and is coupled to the coupling element. This allows the first clutch shoe to be moved between its end positions via the coupling element by moving the switching pin.

[0015] Furthermore, it is provided, for example, that a release end of the switching pin protrudes from the longitudinal opening in the intermediate shaft and a release element is arranged on the tensioning wheel, which keeps the release end of the switching pin in the tensioned position. ¬The tension spring is displaced towards the longitudinal opening, so that the coupling element is moved from its first to its second position. For example, the control element has a contact end projecting radially from the tensioning wheel with an inclined contact surface that rests against the control end of the switching pin when the switching pin is moved. The control element couples the tensioning wheel to the switching pin in a position where the tension spring is under tension, whereby the control element displaces the switching pin and there ¬ opens through the claw coupling.

[0016] Preferably, each of the two clutch shoes extends in a ring shape around the intermediate shaft. This enables a simple and reliable coupling of the jaw clutch to the intermediate shaft and the freewheel.

[0017] Furthermore, for example, a return spring coupled to the first clutch shoe is provided, which exerts a spring force in the second end position of the first clutch shoe. ¬ tung of the first end position onto the first clutch shoe from ¬ The return spring allows the first clutch shoe to be moved from its second end position to the first end position when the control element releases the switching pin upon releasing the accumulator spring. This closes the dog clutch again, and the tensioning mechanism is ready to re-tension the accumulator spring after it has been released.

[0018] The freewheel, for example, has a freewheel ring that runs around the intermediate shaft and to which the second clutch shoe is connected. This ensures reliable coupling of the dog clutch to the freewheel.

[0019] The intermediate gear, for example, can be driven by the tensioning motor via a bevel gear. This redirects the drive force of the tensioning motor, enabling a compact design of the spring-loaded drive.

[0020] The locking mechanism, for example, features a cam disc roller firmly connected to the tensioning wheel and a ¬The pawl, which secures the cam disc roller for locking the tensioning wheel, engages. This enables reliable, releasable locking of the tensioning wheel by means of a simple and cost-effective locking mechanism. A spring-loaded drive according to the invention comprises a tensioning gear according to the invention. The advantages of such a spring-loaded drive result from the advantages of a tensioning gear according to the invention mentioned above. The properties, features, and advantages of this invention described above, as well as the manner in which they are achieved, become clearer and more readily understandable in connection with the following description of exemplary embodiments, which are explained in more detail in conjunction with the drawings. The drawings show:

[0021] FIG 1 a perspective and partially cutaway view

[0022] Illustration of a tensioning mechanism, and FIG 2 an enlarged section of figure 1.

[0023] Corresponding parts are found in the figures with the same ¬ Figures 1 and 2 show a tensioning mechanism 1 for tensioning a (not shown) storage spring of a spring storage drive in a perspective and partially detailed view. ¬ Sectional representation, where Figure 2 shows an enlarged section of Figure 1. The storage spring is, for example, a switching spring of the spring storage drive, which stores energy to close a current path of a power supply. ¬ The switch stores data. The tensioning gear 1 includes, among other things, ¬ rem a tensioning wheel 9, an intermediate shaft 2 and an intermediate ¬ wheel 4.

[0024] The tensioning wheel 9 is rigidly connected to a cam disk 17 and a tensioning shaft 18 and coupled to the accumulator spring via the tensioning shaft 18. The intermediate gear 4 can be driven by a tensioning motor (not shown) via a bevel gear 19. The intermediate shaft 2 is connected to the tensioning wheel 9 and the intermediate gear 4. ¬ The intermediate gear 4 is coupled to the tensioning gear 9 to transmit rotations of the intermediate gear 4 to the tensioning gear 9 for tensioning the storage spring. The coupling between the intermediate shaft 2 and the tensioning gear 9 is a gear coupling formed by a toothed ring of the tensioning gear 9 and a corresponding toothed ring of the intermediate shaft 2.

[0025] The intermediate gear 4 is connected via a freewheel 3 and a claw. ¬ The coupling 20 is coupled to the intermediate shaft 2, with the freewheel 3 connecting the intermediate gear 4 to the jaw coupling 20. The jaw coupling 20 has a rotationally fixed connection to the intermediate shaft. ¬le 2 coupled first clutch shoe 12 and a second clutch connected to a freewheel inner ring 13 of the freewheel 3 ¬ Clutch shoe 11. Both clutch shoes 11, 12 run in a ring shape around the intermediate shaft 2.

[0026] The first clutch shoe 12 is located between a first end ¬ The intermediate shaft 2 is axially displaceable, i.e., parallel to a longitudinal axis 21 of the intermediate shaft 2, in two positions: one in which it rests against the second clutch shoe 11 and which it assumes when the accumulator spring is tensioned, and a second end position in which it is separated from the second clutch shoe 11 and which it assumes when the accumulator spring is tensioned. This displaceability allows the intermediate shaft 2 to move axially, i.e., parallel to a longitudinal axis 21 of the intermediate shaft 2. ¬ The claw coupling 20 engages the freewheel 3 and the intermediate gear 4 to the intermediate shaft 2 for tensioning the storage spring and decouples the freewheel 3 and the intermediate gear 4 from the intermediate shaft 2 in the tensioned state of the storage spring.

[0027] The freewheel 3 decouples the intermediate gear 4 from the intermediate shaft 2 when the accumulator spring is tensioned, as the tensioning shaft 18 passes over top dead center. This prevents the first clutch shoe 12 from rotating and being axially displaceable. ¬ To couple the bar to the intermediate shaft 2, the first coupling ¬ The lung jaw 12 and the intermediate shaft 2, for example, have a toothed connection.

[0028] To move the first clutch shoe 12 from its first end position to the second end position, the intermediate shaft 2 has an elongated transverse opening 22 in the area of ​​the first clutch shoe 12, which runs perpendicular to the longitudinal axis 21 through the intermediate shaft 2. ¬In the opening 22, a coupling element 23 connected to the first coupling shoe 12 is guided and is displaceable in the transverse opening 22 between a first position defining the first end position of the first coupling shoe 12 and a second position defining the second end position of the first coupling shoe 12. In the embodiment shown in the figures, the coupling element 23 is designed as a tube. ¬ det, the ends of which protrude into recesses 24 in the first coupling shoe 12. Alternatively, the coupling element 23 can also be designed, for example, as a bolt.

[0029] Furthermore, the intermediate shaft 2 has a longitudinal opening 25 extending along its longitudinal axis 21, from the transverse opening 22 to an end of the intermediate shaft 2 on the tensioning wheel side. A switching pin 10 is located in the longitudinal opening 25. ¬The coupling element 23 is slidably mounted and has a release end 26 projecting from the longitudinal opening 25 and extending within the longitudinal opening 25 to the coupling element 23. A release control element 8 is arranged on the tensioning wheel 9, which, when the storage spring is tensioned, moves the release end 26 of the switching pin 10 towards the longitudinal opening 25, thus moving the coupling element 23 from its first to its second position. The release control element 8 has a contact end projecting radially from the tensioning wheel 9 with an inclined contact surface 27, which, when the

[0030] Switch pin 10 is located at its control end 26.

[0031] For example, the control element 8 is arranged at a position on the tensioning wheel 9 where the contact surface 27

[0032] The switching end 26 of the switching pin 10 is contacted when the tensioning wheel 9 has rotated approximately three degrees further after the tensioning shaft 18 has reached top dead center.

[0033] Furthermore, a return spring is attached to the first clutch shoe 12. ¬ the 14 coupled, which spiral around the intermediate shaft 2 ¬ The return spring 14 engages at an end of the first clutch shoe 12 facing away from the second clutch shoe 11 and exerts a spring force on the first clutch shoe 12 in the direction of the first end position in the second end position of the first clutch shoe 12.

[0034] The clamping gear 1 also features a locking mechanism. ¬ The locking mechanism 28 is designed to releasably lock the tensioning wheel 9 in the tensioned state of the storage spring. The locking mechanism 28 of the embodiment shown in the figures ¬The mechanism features a cam roller 5 arranged on the cam disc 17 and a pawl 6 that fixes the cam roller 5 to lock the tensioning wheel 9. After the clutch shoes 11, 12 are separated, the cam roller 5 runs against the pawl 6 and is locked in this position by the pawl 6, for example, when the

[0035] The tensioning wheel 9 has rotated approximately ten degrees further after the tensioning shaft 18 has reached top dead center. During this process, the freewheel 3 and a backstop on an auxiliary shaft 7 coupled to the intermediate gear 4 prevent the cam disc roller 5 from rebounding off the pawl 6. Since the clutch shoes 11, 12 are separated from each other when the accumulator spring is tensioned, the intermediate shaft 7 is... ¬ le 2 and components coupled to it, such as the latch 6 and the cam disc roller 5, in the tensioned state of the storage ¬The spring is decoupled from the intermediate gear 4 and not by the intermediate gear 4, for example in the case of a run-on of the

[0036] The clamping motor is loaded and stressed. This results in advantages. ¬ especially the load on the latch 6, the curves ¬ The wear on the disc roller 5 and the freewheel 3 is reduced, and wear or damage to these components of the tensioning gear 1 is prevented by this load.

[0037] To release the energy stored in the tensioned accumulator spring, the coupling of the pawl 6 to the cam roller 5 is disengaged. The uncoiling accumulator spring rotates the tensioning wheel 9 in the same direction as when the accumulator spring was tensioned, whereby the control element 8 releases the switching pin 10 again and the first clutch block 12 is pushed from the second end position to the first end position by the return spring 14, so that the jaw clutch 20 is closed again. This makes the tensioning mechanism 1 ready to tension the accumulator spring again.

[0038] Although the invention is described in detail by preferred embodiments ¬ Where examples have been illustrated and described in more detail, the invention is not limited by the disclosed examples and other variations can be derived from them by the person skilled in the art without leaving the scope of protection of the invention.

Claims

Patent claims 1. Tensioning mechanism (1) for tensioning a storage spring of a spring storage drive, the tensioning mechanism (1) comprising - a tensioning wheel (9) coupled to the storage spring, - an intermediate shaft (2) coupled to the tensioning wheel (9), - an intermediate gear (4) driven by a tensioning motor, - a freewheel (3) coupled to the intermediate wheel (4), - a locking mechanism (28) for releasably locking the tensioning wheel (9) in a tensioned state of the storage wheel ¬ the, and - a claw coupling (20) that couples the freewheel (3) to the intermediate shaft (2) for tensioning the storage spring and decouples it from the intermediate shaft (2) when the storage spring is tensioned.

2. Tensioning device (1) according to claim 1, characterized by the fact that The claw coupling (20) has a first coupling shoe (12) rotationally fixed to the intermediate shaft (2) and a second coupling shoe (11) connected to the freewheel (3), wherein the first coupling shoe (12) can be moved between a first end position in which it rests against the second coupling shoe (11) and a second end position in which it is separated from the second coupling shoe (11) and which it is in the ¬ The storage spring assumes a tensioned state and is movable.

3. Tensioning device (1) according to claim 2, characterized by the fact that the first clutch shoe (12) is coupled to the intermediate shaft (2) by a coupling element (23), wherein the coupling element ¬ment (23) is guided through a transverse opening (22) in the intermediate shaft (2) which extends perpendicular to a longitudinal axis (21) of the intermediate shaft (2) and in the transverse opening (22) between a first position defining the first end position of the first clutch shoe (12) and a second end position defining the first clutch shoe (12) second position is displaceable parallel to the longitudinal axis (21) of the intermediate shaft (2).

4. Tensioning mechanism (1) according to claim 3, characterized by the fact that the coupling element (23) is designed as a tube or bolt whose longitudinal axis is perpendicular to the longitudinal axis (21) of the connecting element. ¬ shaft (2) is arranged and its ends are in recesses ¬ gen (24) protrude into the first clutch shoe (12).

5. Tensioning device (1) according to claim 3 or 4, characterized by a switching pin (10) which is slidably mounted in a longitudinal opening (25) extending along the longitudinal axis (21) of the intermediate shaft (2) and is coupled to the coupling element (23).

6. Tensioning device (1) according to claim 5, characterized by the fact that a control end (26) of the switching pin (10) from the longitudinal opening ¬ nung (25) protrudes and a control wheel (9) is attached to the tension wheel. ¬ element (8) is arranged which, in the tensioned state of the storage spring, moves the control end (26) of the switching pin (10) towards the longitudinal opening (25), so that the coupling element (23) is moved from its first to its second position ¬ Ben will.

7. Tensioning gear (1) according to claim 6, characterized by the fact that the control element (8) extends radially from the tensioning wheel (9) ¬has a stationary contact end with an inclined contact surface (27) which, when the switching pin (10) is moved, contacts the ¬ sen control end (26) is located.

8. Tensioning mechanism (1) according to one of claims 2 to 7, characterized in that the two clutch shoes (11, 12) each run in a ring shape around the intermediate shaft (2).

9. Tensioning device (1) according to one of claims 2 to 8, characterized by a return spring (14) coupled to the first clutch shoe (12), which in the second end position of the first clutch shoe (12) exerts a spring force in the direction of the first end ¬ position exerted on the first clutch shoe (12).

10. Tensioning device (1) according to one of claims 2 to 9, characterized in that the freewheel (3) runs around the intermediate shaft (2) ¬ has a freewheel ring (13) and the second clutch assembly ¬cke (11) is connected to the freewheel ring (13).

11. Tensioning mechanism (1) according to one of the preceding demands ¬ che, characterized by the fact that the intermediate gear (4) can be driven by the tensioning motor via a bevel gear (19).

12. Tensioning device (1) according to one of the preceding claims, characterized by the fact that the locking mechanism (28) a cam disc roller (5) fixedly connected to the tensioning wheel (9) and a locking element ¬ ke (6), which fixes the cam disc roller (5) for locking the tension wheel (9).

13. Spring-loaded storage drive with a tensioning mechanism (1) designed according to one of the preceding claims.