MXPA97006718A - Gear displacement device for a veloci change gearbox - Google Patents

Abstract

In a gear shift device for a gearbox of speed change, a displacement driver, a selection driver, an impeller which is arranged so that it can be displaced exclusively axially with respect to a housing, a auxiliary transmission, to convert a rotary movement into a reciprocal movement, a brake, which is connected to the selection impeller and a locking device, which can be coupled and uncoupled, are arranged in terms of their action in such a way that two of the three impellers are fixed in terms of movement with respect to each other and are connected to the third impeller by the auxiliary transmission, and this selection impeller is fixed either in a rotationally fixed manner or not axially displaceable, with respect to the housing

Description

GEAR DISPLACEMENT DEVICE FOR A GEAR CHANGE GEARBOX The invention relates to a gear shifting device for a gearbox of speed change, according to the preamble of patent claim 1. A gear shifting device, of the type mentioned at the beginning, forms the subject of the oldest German patent application 196 10 104.2-14, which is not a prior publication. In this gear shifting device, a selection control sleeve is concentrically arranged to a shift control shaft and connected to the latter by the auxiliary transmission in the form of a gate / gate pin arrangement, this control shaft of displacement is connected, by a rod-type impeller, to a medium pressure servomotor of axial piston design, while an electromagnet is used for the operation of driving the brake in the selection of the control sleeve. This selection control sleeve is fixed immovably with respect to the housing in the longitudinal directions of the central axis, while the displacement control shaft is engaged by the bolt device in its significant rotational angle positions, assigned to a gate. respective displacement to move one or two gears. In this gear shifting device, according to the oldest patent application, it is already possible to move the gear from a current gear to a new gear, while at least one intermediate gear jumps, causing the shift control shaft to run a linear action movement, which oscillates around the mean significant position and thus alternately engages and decouples the brake from the drive control sleeve, as it passes through the middle significant portion. In order to avoid, when the gears jump, an impact between the timing devices assigned to these gears by means of the shift control shaft, some free travel is provided for the shift control shaft. DE 41 37 142 has disclosed a gear shift device of another type, in which an electric motor is connected, by means of a helical gear mechanism, to convert the rotary movement in a reciprocal movement, to a rod of The displacement of gears, which is mounted rotationally and can be displaced axially in a housing and can be fixed with respect to the housing by means of a brake device that can be coupled and uncoupled, in such a way that the gear shift rod is disposed to be axially displaceable exclusively in the engaged position of the brake, but in the uncoupled position of the brake is arranged to be able to move axially and rotate with respect to the housing. The gear shift rod is connected directly to the shaft of the electric motor by means of a coupling, which can be coupled and uncoupled in opposite directions to the brake. When switching between the selection and the displacement, both the coupling and the brake have to be reversed and the electric motor stops. DE 43 09 027 A1 has disclosed a further gear shifting device of another type, in which a gear shifting shaft, which is rotatably disposed and axially displaceable with respect to a medium pressure cylinder, can to be moved by a first axial piston of the medium pressure cylinder directly in the directions of the shaft of the gear shift shaft to perform this gear shift. A second axial piston of the medium pressure cylinder, with the help of an auxiliary transmission to convert a reciprocal movement into a rotary movement with respect to the shaft of the gear shift shaft, causes this gear shift shaft to perform rotary movements to select the displacement gates. The fundamental object of the invention consists essentially in allowing a gear-shifting device, of the type mentioned at the start, similarly to jump at least one intermediate gear when it is moved from the current gear to a new gear, but omitting or avoiding for the most part the special free trip for the displacement impeller. The aforementioned object is advantageously achieved, according to the invention, by the features of patent claim 1. In the gear-shifting device, according to the invention, the displacement driver, when acting at the position of the rotation angle associated with the new gear, remains fixed, without movement, by the fastening device, in the longitudinal directions of the central axis of the housing, so the special free travel for the displacement impeller - in order to avoid the impact between the synchronization devices during this action - is not required, because the linear movement required for the selection of the The new rotation angle position is only realized by the third impeller, which is arranged so that it can be displaced exclusively axially with respect to the housing. The sub-claims 2 to 4, 8 and 9, refer to advantageous configurations of the gear-shifting device, according to the invention. The subclaims 5 to 7 each refer to an advantageous embodiment of the gear shifting device, according to the invention. Details of the invention will emerge from the following description of three embodiments, schematically illustrated in the drawing, in which: Figure 1 shows a displacement device, of gears according to the invention in a first embodiment, illustrated in the form of a axial section containing the central axis; Figure 2 shows a gear shifting device, according to the invention in a second embodiment, illustrated in the form of an axial section containing the central axis; Figure 3 shows a cross section of the gear shifting device of Figure 2 in the line III-III; Figure 4 shows a gear shifting device, according to the invention in a third embodiment, illustrated in the form of a partial section containing the central axis; Figure 5 shows a partial longitudinal section through the gear shifting device of Figure 4 on the V-V line; and Figure 6 shows a gear shift diagram for the operation of the displacement driver in the gear shift device according to the invention. The following arrangement is common to the three embodiments of Figures 5 of the gear-shifting device according to the invention: A displacement driver 9, in the form of a shaft, a selection driver 10, in the form of a hollow shaft or sleeve, a rod-type impeller 11 and a medium-pressure servomotor 28, with an axial piston 29 of double action, are arranged coaxially with a central axis 7-7 of a housing 8 (not shown in greater detail) of a gearbox of speed change (also not shown in greater detail). The displacement impeller 9 is designed to be fixed in terms of movement with respect to the impeller selection, or is integral with it. This selection impeller 10 is connected, by means of an auxiliary transmission 14, in the form of a helical gear mechanism, to convert a reciprocal movement in a rotary movement, to the impeller 11, which is arranged so that it can be displaced exclusively axially with respect to the housing 8 and is for its part fixedly connected, in terms of movement to the axial piston 29. The displacement impeller 9 can be operated in a position of significant rotation angle (Figure 3), in which an axial groove 21 in the outer circumference of the selection impeller 10 is placed in a reference plane 30-30 of the housing 8 , this plane contains the central axis 7-7. This axial groove 2 is assigned to the displacement gate 3-4 for, optionally, the coupling to the gears 3 and 4 forwards, in such a way that by the operation of the displacement impeller 9 in the position of significant angle of rotation in the directions of the central axis 7-7, the forward gear 3 or 4 is either coupled or decoupled. The displacement impeller 9 can be further operated at a position of significant rotation angle (Figure 3), in which an axial groove 22 on the outer circumference of the selection impeller 10 is placed in the reference plane 30-30. The axial groove 22 is assigned to the displacement gate 1-2 for, optionally, the displacement of the forward gears 1 and 2, such that by the operation of the displacement pusher 9, which is in the angle position. of significant rotation, in the directions of the central axis 7-7, the forward gear 1 or 2 is either coupled or decoupled. The displacement impeller 8 can be operated in a third position of significant rotation angle (Figure 3), in which an axial groove 23 in the outer circumference of the selection drive 10 is placed in the reference plane 30-30. The axial groove 23 is assigned to the displacement gate 5-6 to optionally move the gears forward 5 and 6 in such a way that by the operation of the displacement driver 9, which is in the position of significant angle of rotation, in the directions of the central axis 7-7, the forward gear 5 or 6 is either coupled or decoupled. In order to operate the displacement driver 9 at the respective significant rotation angle position, the selection driver 10 is fixed with respect to the housing 8, in the directions of the central axis 7-7, by means of a locking device 12, which can be coupled and uncoupled, a locking coupling element 19 engages in a circumferential groove 20 in the outer circumference of the selection driver 10, such that this selection driver 10 is fixed so that it can not be displaced exclusively in axial shape.

To operate the displacement driver 9 in the directions of the central axis 7-7, in order to move the gears, the locking device 12 is decoupled and a brake 13, which is connected to the selection driver 10, engages, a brake coupling element 18, which passes inside the axial groove 21 or 22 or 23, which is respectively located in the reference plane 30-30 in a rotationally fixed manner, but can be displaced axially, relative to the impeller 10 of selection. The axial piston 29 has a significant stroke position 16, in which the displacement pusher 9, in the non-driven position, adopts a rest or support position 16 *, which is centered by return springs, in the transition between the displacement gate 3-4 and the neutral selection gate 0-0 of the displacement diaphragm of Figure 6. In the rest position 16 *, the displacement impeller 9 is placed in the position of significant rotation angle of the 3-4 switch hatch, the brake coupling element 18, which passes inside the associated axial groove 21. In order to ensure that the locking device 12 and the brake 13 can only be driven in the significant stroke position 16 of the axial piston 29, a displacement sensor 15, which indicates the stroke position 16, is connected to a device which controls a servomotor 17 of the brake 13, but is not shown in greater detail. In the first embodiment of the gear displacement device, according to the invention, according to Figure 1, the circumferential groove 20 of the locking device 12 is offset with respect to the axial grooves 21 to 23 of the brake 13 in the longitudinal directions of the central axis 7-7, the brake coupling element 18 is connected to the locking coupling element 19 by means of a differential lever 24, which is articulated with respect to the housing 8 in its middle region. In the second embodiment of the gear displacement device, according to the invention, according to Figures 2 and 3, the circumferential groove 20 of the locking device 12 is arranged diametrically opposite with respect to the central axis 7-7, to the axial grooves 21 to 23 of the brake 13, the brake coupling element 18 and the lock coupling element 19 are connected to each other by at least one hinge-type articulation 25 and / or 26, which surrounds the selection pusher 10, and the joints are guided in a displaceable manner parallel to the reference plane 30-30 in the frame-like guide 31, which is fixed in terms of movement to the housing 8. In the third embodiment of the gear-moving device, according to the invention , according to Figures 4 and 5, both the circumferential groove 20 of the locking device 12 and the axial grooves 21 to 23 of the brake 13 are arranged centrally with respect to a reference plane 27-27 of the selection driver 10, this plane is placed perpendicular to the central axis 7-7. The axial grooves 21 to 23 are positioned within the region of rotation angle covered by the circumferential groove 20, the position 32 * indicates a length of rope corresponding to the dimension of the curve of the angle of rotation interval. The circumferential groove 20 is placed in a radial buckling 33 of the selection driver 10 and radially outward with respect to the axial grooves 21 to 23. The brake coupling element 13 and the locking engagement element 19 of the locking device 12 are structurally combined to form a common coupling element 18 (19), which can be alternately engaged in the circumferential groove 20, on the one hand, or one of the axial grooves 21 to 23, on the other hand, by means of an articulation 34 , which is connected in a manner not illustrated in greater detail to the servomotor 17 of the brake 13. In all three modes of the gear-moving device, the coupling-articulation between the locking device 12, the brake 13 and the servomotor 17 is so that the selection impeller 10 is arranged to be or immobile exclusively axially or fixed exclusively in a rotational manner with respect to the housing 8. The The operating method of the gear shifting device according to the invention is explained below with reference to a gear shifting sequence. When the displacement rises from a second gear within the third gear, the drive impeller 9 initially assumes that position of the angle of rotation, in which the axial groove 22, assigned to gate 1-2 of the switch, is placed in the plane 30-30 and accommodates the brake coupling element 18. By the operation of the servomotor 28 in its significant stroke position 16, the second gear is decoupled and the displacement pusher 9 moves within the displacement gate 0-0 in the direction of the central axis 7-7. When you reach position 16 of significant career, the displacement sensor 15 inverts the servo motor 17 of the brake 13, so that the selection driver 10 is fixed in the longitudinal directions of the central axis 7-7 with respect to the housing 8 by the locking device 12. A subsequent controlled operation of the impeller 11 by the servomotor 28 leads to a rotary movement of the displacement impeller 9 at that position of significant angle of rotation, in which the axial groove 21 assigned to the gate 34 of the switch, is placed in the reference plane 30- 30 When the displacement impeller 9 reaches this rotational angle position, the servomotor 17 is reversed again, as a result of which the brake coupling member 18 engages in the axial groove 21 and the engagement coupling element 19 is uncoupling from the circumferential groove 20. When the servomotor 17 reaches this position, the displacement impeller 9 is further operated by the servomotor 28, in the directions of the central axis 7-7, beyond the selection 0-0 gate and as a result, the third gear is engaged.

Claims (9)

1. CLAIMS 1. A gear-shifting device for a gearbox of speed change, • having a displacement driver, which is rotatably disposed and can be moved axially with respect to a central axis of a housing; »Having a selection impeller, which is coaxial with respect to the central axis and rotatably disposed relative to the housing; «Having an impeller, which is coaxial with respect to the central axis and is arranged so that it can be displaced exclusively axially in relation to the housing; • having elements for fixing the selection impeller with respect to the housing in the longitudinal directions of the central axis; • having a brake, which can be coupled and uncoupled, to fix the selection impeller with respect to the housing in the circumferential directions of the central axis; • that has an auxiliary transmission, to convert a reciprocal movement into a rotary movement; and in which two of the three impellers are both arranged so that they are fixed in terms of movement with respect to each other, at least in the longitudinal directions of the central axis and are connected to the third impeller by the auxiliary transmission, characterized in that a device which can be coupled and uncoupled, is connected in terms of action, both to the selection driver and to the brake, in such a way that this selection driver can be fixed with respect to the housing, alternating or exclusively in the circumferential directions or exclusively in the longitudinal directions of the central axis and in which the selection driver is connected by the auxiliary transmission to the impeller, which is arranged so that it can be displaced exclusively axially, with respect to the housing.
2. 2. Gear shift device, according to claim 1, characterized in that a helical gear mechanism is used for the auxiliary transmission.
3. 3. Gear shift device, according to claim 1 or 2, characterized in that a sensor is used for the significant mean position of the impeller, which is arranged so that it can be displaced exclusively axially with respect to the housing and intercepts with a servomotor to activate the brake, in such a way that this brake can be coupled and uncoupled exclusively in the significant position of the impeller.
4. 4. Gear displacement device, according to claims 1 to 3, characterized in that the selection driver has a circumferential groove, which is centric to the central axis and in which a locking engagement element of the locking device can be coupled , this element is fixed in terms of movement with respect to a coupling element of the brake, which can be coupled and uncoupled.
5. Gear moving device, according to claim 4, characterized in that the circumferential groove is displaced in the longitudinal directions of the central axis, with respect to the axial grooves of the selection impeller, in which the axial grooves of the brake coupling, they can be coupled, and because the brake coupling element and the locking coupling element are connected to each other by means of a differential lever, which, in its central region, is mounted so that it can pivot with regarding accommodation.
6. 6. Gear shifting device according to claim 4, characterized in that the circumferential groove is arranged diametrically opposite to the central axis, to the axial grooves of the selection impeller, in which the axial grooves of the coupling element of the The brake can be engaged, and in that the brake coupling element and the lock coupling element are connected by at least one ring-type hinge and / or which surrounds the selection impeller.
7. 7. Gear shift device, according to claim 4, characterized in that in both the circumferential groove and in the axial grooves of the selection impeller, in which the axial grooves of the brake coupling element can be coupled, they are disposed centrically with respect to a plane of reference of the selection impeller, in which this reference plane is placed perpendicular to the central axis, in which the axial grooves are placed within the region of the angle of rotation covered by the circumferential groove and in which the circumferential groove is placed radially to the outside with respect to the axial grooves and a common coupling element is used both for the brake coupling element and for the locking coupling element.
8. 8. Gear shifting device according to one of claims 1 to 7, characterized in that the impeller, which is arranged so that it can be displaced exclusively axially with respect to the housing, is connected to a pressure servomotor. Average axial piston design.
9. 9. Gear shift device, according to claims 3 to 8, characterized in that an electromagnet is used for the brake servomotor.