WO1997004252A1

WO1997004252A1 - Selecting device for an automatic shift gearbox

Info

Publication number: WO1997004252A1
Application number: PCT/DE1996/001331
Authority: WO
Inventors: Harald MÜHLSTÄDT; Uwe Volkmar
Original assignee: Sachsenring Automobiltechnik Gmbh
Priority date: 1995-07-24
Filing date: 1996-07-20
Publication date: 1997-02-06
Also published as: DE19526951C2; DE19526951A1

Abstract

A selecting device for switching an automatic shift gearbox is mounted on the steering wheel column (21) by holding means (1) and the ignition lock (Z) is mechanically coupled to the selecting lever (7) of the selecting device by an adjusting member (15). The selecting lever (7) is mechanically coupled to the switching device, in particular by means of a Bowden cable (17). A locking lever (11) mounted on the holding means (1) is coupled to the ignition lock (Z) in such a way that the selection lever (7) is blocked in the selection position 'P' when the ignition is switched off.

Description

Schaltvorrichtunσ for an automatic transmission

The present invention relates to a switching device for an automatic transmission according to the preamble of claim 1.

Such a switching device is known from DE 3905698 Cl. The switching device for preselecting the switching stages "PRND" and possibly "3-2-1" is located there on the center console of a vehicle. A Bowden cable and the core of an electromagnet are provided between the cam disk which can be rotated by the ignition key and the locking lever which locks the switch position "P". The end of the Bowden cable that is far from the cam lies against the core, which in turn presses against the locking lever, since the locking lever is biased by a tension spring and is pressed by this against the core. The selector lever has a laterally protruding pin which engages in a shift gate and locks the selector lever in position "P". To release the same from this position, a push button is provided in the handle of the selector lever. By pressing the push button, the pin is moved out of the locked position of the shift gate so that the selector lever can be moved to the other positions. However, this is only possible when the electromagnet is energized, i.e. when the ignition is switched on. The selector lever can only be pivoted in the direction of the curve of the shift gate. The selector lever is connected to the gearbox via a linkage. In this known switching device In addition to a Bowden cable, an electromagnet is also required and there is a rigid connection between the switching device and the automatic transmission.

In the switching device known from DE 3943011 AI, the locking lever, which is pretensioned by a tension spring, can be unlocked via an electromagnet and a cross pin can be moved out of the switching link by a pressure lever arranged in the handle. A special electronic circuit is used to control the electromagnet.

In the shifting device known from DE 4225182 AI, which is attached to the center console of a motor vehicle, the gearbox is actuated via a Bowden cable or a linkage. The selector lever has a handle designed as a push button on the end face, through which a cross pin can be moved out of a locked position of the shifting gate via a rod.

Finally, EP 0432507 A2 discloses a shifting device for an automatic transmission which is mounted in the area of the steering wheel and in which the shifting positions are preselected electrically. For actuation, a selector lever of an electrical switch is provided, which can be pivoted in the direction of the shift gate and transversely to it in the direction by contacts switched on from the selector lever. In addition, a special locking lever to be operated by the driver is provided.

The object of the present invention is to achieve a compact switching device with simple mechanical couplings between the ignition lock and the switching device. This object is achieved by the features of claim 1.

The switching device consisting of a few, simple, exclusively mechanical components can be implemented very simply, inexpensively and in a space-saving manner due to the arrangement on the steering wheel column and the resulting short connecting distances to the ignition lock. It therefore creates space in the area of the center console of the vehicle and also requires very little installation space in the area of the steering wheel column, since there is only a single tappet between the ignition lock and the locking lever. In addition, the arrangement on the steering wheel column is particularly advantageous if the steering wheel column is adjustable in height and, if necessary, also adjustable in inclination or bent in the event of an accident, since the adjustment due to the flexible coupling of the selector lever with the manual transmission via the Bowden cable has no influence on the transmission which has actuating forces from the ignition lock to the actuating device for the switching device. In addition, there is no need for a selector lever which is hollow and contains a pressure web which can move a crossbar or crossbar guided in the shifting link out of engagement with the shifting link.

Further advantageous details of the invention are specified in the subclaims and are described in more detail below with reference to the exemplary embodiments illustrated in the drawing. Show it:

1 is a side view of the switching device according to the invention, partly in section, FIG. 1 a shows a schematic diagram of a locking possibility in the "P" position of the ignition key,

1b shows a basic circuit of an electrical locking or unlocking in the "P" and "N" positions via the foot brake,

Fig. 2 is a plan view of the switching device according to FIG. 1, partially in section and

3 and 4 are a side view and plan view of an embodiment of the arrangement of the shift lever on the pivot lever using a joint made of an elastomer.

1 and 2 in FIGS. 1 and 2 designate a holding part made of, for example, stamped and bent sheet steel, on which a pivot lever 2 is pivotally mounted about a first pivot axis 3 attached to the holding part 1. The pivot lever 2 is secured in position by a washer 4 and a locking ring 5.

The swivel lever 2 carries a second swivel axis 6, the axial direction of which is offset by 90 ° - or approximately 90 ° - from the first swivel axis 3. A shift lever 7 is pivotably mounted by means of the second pivot axis 6 and secured by a locking ring 20.

The shift lever 7 is provided with a bore 7.1 in which a locking pin 8 counteracts the force of a compression spring 9. is guided. The end 8.1 of the locking pin 8 protruding from the bore 7.1 plunges into a link guide

10.1 a shifting gate 10 a.

The link path 10.2 of the link guide 10.1 runs in the pivoting direction of the shift lever 7 about the first pivot axis 3 of the pivot lever 2 on a circular section concentric with the pivot axis 3. In the pressure direction of the locking pin 8, it has at least four number of depressions 10.p, 10.r, 10.n and 10d corresponding to the respective switching position of the switching stages or preselection stages P-R-N-D of an automatic transmission.

The first three depressions lO.p, lO.r and lO.n are each provided in a notch p or r or n which laterally branches off from the slide track 10.2. The bottom 10.3 of the slide track 10.2 is formed so as to slope downwards towards the recesses 10.p, 10.r and 10.n, as a result of which the locking pin 8 is always snapped into the recess.

The fourth depression lO.d is in the middle of the backdrop

10.2 attached. From this a notch d.l or d.2 branches laterally on each side, the bottom

10.3 of the slide track 10.2 there rises obliquely from the depression 10.d to the notches d.l or d.2, whereby the locking pin 8 is pushed into the depression 10.d in the normal position "D" and locked.

A locking lever 11 is pivotally mounted on a bolt 12 provided on the holding part 1 and secured in position by a locking ring 13. The locking lever 11 is arranged outside the pivoting range of the shift lever 7. It is under resilient prestress, for example around the bolt 12 looped torsion spring 14. A different type of spring can also be provided or the locking lever 11 can itself be made of resilient material and be attached in a pretensioned manner.

One lever arm 11.1 of the locking lever 11 is coupled to a plunger 15 which is operatively connected to the ignition lock Z and which is displaceably guided in a screw-in part 16 with a polygonal, in particular hexagonal, outer section 16.1. The plunger 15 has a driver 15.1, which is coupled to the lever arm 11.1. The other lever arm 11.2 of the locking lever 11 can be pivoted into the pivoting region of the switching lever 7 with its free end 11.3 designed as a locking part. In the switching state switching stage "P", the end 11.3 can engage in a notch 7.2 of the switching lever 7 and prevent the switching lever 7 from moving, as shown in dashed lines in FIG. 1.

The free end 15.2 of the plunger 15 is in a manner known per se with a guide member, e.g. a cam disk K or the like. of the schematically illustrated ignition lock Z in operative connection and can be displaced over the latter when the ignition key is turned. The plunger 15 is moved to the right when the ignition is switched on in the position shown in FIG. 1 and upwards in the position shown in FIG. 1 a, the locking lever 11 being counter to its locking direction, that is to say counterclockwise. is moved and pivoted out of the pivoting range of the shift lever 7 and releases the pivoting movement thereof.

On a lever arm 2.1 of the swivel lever 2 that projects perpendicularly or obtusely to the direction 21.1 of the steering column 21 the soul 17.1 of a Bowden cable 17 is pivotally attached via a pin 19 and fixed in position by a locking ring 18.

The switching lever 7 is actuated via a switching handle 22 attached to this (FIG. 2).

A shift-lock electromagnet 25 is attached to the retaining tabs 23 and 24 of the holder 1, the locking bolt 25.1 of which, for example, has two locking stops 30.1 and 30.2 of the Arm 2.1 of the pivot lever 2 projecting at an obtuse angle or at right angles can cooperate.

The locking stops 30.1 and 30.2 are arranged so that in the switching position "P" when the electromagnet 25 is energized, the locking bolt 25.1 bears against the edge of the locking stop 30.1 and in the switching position "N" engages in the locking stop 30.2 designed as a bore. The excitation of the electromagnet 25 takes place in the positions "P" and "N" in a manner known per se according to official regulations when the ignition is or is switched on and at the same time the foot brake is not depressed when the ignition is switched on. Only then is the usually required locking of the shift lever 7 in the "P" and "N" positions.

In a possible basic circuit shown in FIG. 1b, the plunger 15 can be actuated via the cam K rotated by the ignition key via a cam 15N. A in the circuit of the electromagnet 25 switch Sl is closed via a cam SIN and the plunger Sl.l cooperating with it when the The ignition key and thus the cam K is turned to the "on" position. In this circuit there is a closed switch S2 which can be actuated via the foot brake F. The switch S2 is coupled to the actuating core 40 of an electromagnet 41, with which a further, open switch S3 is also coupled. The open switch S3 has two holding contacts S3.1 and S3.2, which are connected as holding contacts for the electromagnet. The hold contact S3.1 is on the plus pole and the hold contact

53.2 is located on the one contact S4.1 of an open switch S4, the other contact S4.2 of which is connected to the one terminal 41.1 of the electromagnet 41. The other contact of the electromagnet 41 is grounded. The switch S4 is through a cam S4N of the cam K via a plunger

54.3 operable.

When the ignition key and thus the cam K are turned to the "on" position, the switches S1 and S4 are closed. The electromagnet 25 is energized and its locking bolt 25.1 goes into the locking position. If the foot brake F is now actuated, the switch S2 opens, as a result of which the electromagnet 25 is de-energized and the locking bolt 25.1 moves into the unlocked position. At the same time, switch S3 is closed. As a result, the electromagnet 41 receives current, the actuating core 40 is attracted, and the switch S3 is kept in the closed position and the switch S2 in the open position. This state is maintained until the ignition key and thus the cam K is turned to the "off" position. The state shown in FIG. 1b is then restored. On the shift lever 7 there is a switch actuator 27 which, in the switching position "D", is operatively connected to a switch lever 28.1 of an electrical switch 28 which is in a central position. When the locking pin 8 is deflected into the notches d1 or d.2 of the slide track 10.2, the switch lever 28.1 can be moved from one of its central positions to one side or the other. In this case, a switching contact is actuated, via which a manual transmission can be shifted up or down electrically in steps. In this way, the gear ratio can be increased or decreased in steps, for example by tapping the respectively assigned switching contact, ie the respective gear of a multi-step transmission can be switched on. Instead of a switch with a central position and with two switch positions, two separate switches can also be provided.

According to an advantageous embodiment of the invention, according to the embodiment of the pivot lever 2 and the shift lever 7 shown in FIGS. 3 and 4, instead of the pivot axis 6 for the shift lever 7 between the latter and the pivot lever 2, an elastic member 32 made of an elastomer that can be subjected to bending can be used , for example rubber, neoprene or the like. This elastic member 32 can preferably be vulcanized on the one hand on the pivot lever 2 and on the other hand on the shift lever 7 or a carrier 31 that can be connected to it.

In addition to the resilient design of the elastic member 32, this can be designed to withstand pressure in the sliding direction of the locking pin 8 in such a way that the locking pin 8 is rigid on the shift lever 7 or on a flat Carrier 31 can be fastened or form a structural unit with it. As a result, the compression spring 9 can be saved and no sliding guide for the locking pin 8 is required.

Claims

claims

1. Switching device with a selector lever for preselecting at least four switching stages of a switching device of an automatic transmission, via which at least the four switching stages "P", "R", "N" and "D" can be switched, with a holding part having a shifting gate (10) (1), a shift lever (7) pivotably mounted on the holding part (1) and adjustable in the direction of the shifting link (10), which is in operative connection with the shifting link (10) via a locking pin (8) and with which the selector lever (22) is rigidly connected, further to a locking lever (11) which is pivotally attached to the holding part (1) and which is operatively connected to a lever arm (11.1) via an actuator (15) with a control curve which also rotates when the ignition key of an ignition lock (Z) is turned a locking part (11.3) of the locking lever (11) is pivoted into the pivoting range of the switching lever (7) by the spring force of a prestressed spring (14) when the ignition is switched off, and d These are locked in position "P" and the locking part (11.3) is pivoted out of the pivoting range of the shift lever (7) and releases it when the ignition is switched on, characterized by the following features:

- a) the holding part (1) for the mechanical Schaltvor¬ device for automatic transmission is on the steering wheel column (21) or attached in its area;

- b) between the control curve of the ignition lock (Z) and the locking lever (11) between the control curve and locking lever (11) as an actuator, only one with the locking lever (11) is in direct operative connection with a movable plunger (15);

- c) the shift link (10) attached to the holding part (1) runs concentrically to the pivot axis (3) of the shift lever (7);

- d) the shift lever (7) with the locking pin (8) is pivotally mounted both in the direction of the shift link (10) and transversely thereto;

- e) the laterally deflectable shift lever (7) is in firm connection with the actuating handle (22) and is in mechanical operative connection via a pivot lever (2) and a Bowden cable (17) with the manual transmission.

2. Switching device according to claim 1, characterized gekenn¬ characterized in that the locking pin (8) in the shift lever (7) against the force of a compression spring (9) is slidably mounted and with its from the guide (hole 7.1) projecting end (8.1) under Compressive force of the compression spring (9) slides on the sliding track (10.2) of the shifting link (10), the sliding track (10.2) having recesses provided according to the switching stages "P", "R", "N" and "D" (10 .p, 10.r,

10.n, 10.d) is provided.

3. Switching device according to claim 1 or 2, characterized in that the locking lever (11) is resiliently biased and the plunger (15) with the locking lever (11) is coupled such that it in turn is turned off by the locking lever (11) in the "ignition" direction "is biased.

4. Switching device according to claim 3, characterized in that the locking part (11.3) of the locking lever (11) is arranged on it or coupled to it in such a way that it is biased towards the switching lever (7).

5. Switching device according to one of claims 1 to 4, characterized in that the plunger (15) is guided displaceably with its central region in a guide member (16).

6. Switching device according to claim 5, characterized gekenn¬ characterized in that the guide member (16) is designed as a screw-in part.

7. Switching device according to claim 6, characterized in that at least a portion of the outer surface of the guide member (16) is provided with a polygonal surface, in particular a hexagonal surface (16.1).

8. Switching device according to one of claims 1 to 7, characterized in that the locking part (11.3) of the Sperr¬ lever (11) engages in the position switching stage "P" in a notch (7.2) or in a groove of the switching lever (7) .

9. Switching device according to claim 3, characterized gekenn¬ characterized in that the locking lever (11) is biased by a torsion spring (14).

10. Switching device according to one of claims 1 to 9, characterized in that the switching lever (7) on a about a first pivot axis (3) pivotally mounted pivot lever (2) by means of a on the pivot lever (2) arranged transversely to the pivot axis (3) second The pivot axis (6) is pivotally mounted, the pivot axis (3) for the pivot lever (2) being arranged such that a free end of the pivot lever (2) protrudes in the direction of the switching link (10) and in the direction of the link guide (10.1) is pivotable, and that the second pivot axis (6) for the shift lever (7) is arranged transversely to the pivot axis (3) of the pivot lever (2) in such a way that the shift lever (7) can be deflected transversely to the direction of the link guide (10.1).

11. Switching device according to claim 10, characterized in that the pivot lever (2) has two Arretieran¬ stops (30.1, 30.2) that on the holding part (1) an electromagnetically actuated, each in the positions switching stage "P" and switching stage "N" with one of the locking stops (30.1, 30.2) in operable locking bolt (25.1) is provided, and that the locking bolt (25.1) in the positions switching stage "P" and switching stage "N" when the ignition is switched on and the footbrake is not depressed by means of electrical switching means is in operative connection with the respectively assigned locking stop (30.1 or 30.2) and blocks the shift lever (7) in these positions "P" or "N".

12. Switching device according to one of claims 1 to 11, characterized in that the slideway (10.2) of the Kulis¬ senführung (10.1) for the end (8.1) of the locking pin (8)

- For each of the switching stages "P", "R", "N" a locking recess (10.p; 10.r; 10.n) laterally offset to the slide track (10.2) in a respectively assigned notch (p; r ; n), towards which the bottom (10.3) of the sliding track (10.2) is formed in a sloping manner and

- For the switching stage "D" on the circular path a recess (lO.d) and on both sides thereof a laterally projecting notch (dl or d.2) is provided, towards which the bottom (10.3) the slide track (10.2) is designed to rise obliquely from the locking recess (lO.d), and that the end (8.1) of the locking pin (8) is pivoted in the direction of the pivot lever (7) about its pivot axis (6) the lateral notches (p, r, n; dl, d.2) can be deflected.

13. Switching device according to claim 12, characterized gekenn¬ characterized in that in the position of the shift lever (7) in the switching stage "D" during lateral deflection of the same by pivoting about its pivot axis (6) in one of the side notches (dl, d.2 ) a switch contact of a switch (28) or two separate switches can be actuated.

14. Switching device according to claim 13, characterized gekenn¬ characterized in that the gear ratio, the ratio or the gear of a multi-speed transmission can be switched up or down via the switch contacts.

15. Switching device according to one of claims 1 to 14, characterized in that the switching lever (7) with the pivot lever (2) instead of by means of a bolt as a pivot axis (6) is deflectably connected via a resilient member capable of bending (32) .

16. Switching device according to claim 15, characterized gekenn¬ characterized in that the elastic member (32) in the direction of the locking pin (8) can be subjected to pressure and the locking pin (8) in or on the shift lever (7) or on a corresponding carrier ( 31) is rigidly attached or forms a structural unit with it.

17. Switching device according to claim 15 or 16, characterized in that the elastic member (32) consists of a vulcanizable elastomer and on the one hand directly or indirectly on the pivot lever (2) and on the other hand on the shift lever (7) or on a correspondingly actuatable bar Carrier (31) is vulcanized.