DE3218872A1 - Gear selection device for a vehicle gearbox, especially that of commercial vehicles - Google Patents

Abstract

Gear selection device for a vehicle gearbox, especially that of commercial vehicles, with at least one gear-change shaft (4) mounted so as to be rotatable and translatable in the gear case and intended for the engagement of individual gears arranged in series and with a gear lever (2) which interacts with the gear-change shaft (4). In this arrangement, a stop (10) is provided between the gear lever (2) and the gear-change shaft (4) for the purpose of locking the transmission in a particular gear. <IMAGE>

Description

Switching device for a gear change transmission

of vehicles, especially commercial vehicles g

The invention relates to a switching device according to the preamble of claim 1.

There are shifting devices for change gears of motor vehicles known in which the shift lever with its shift finger reaching into the transmission housing with one or more Shift shafts is connected, which in turn are rotatably and axially displaceably mounted in the transmission housing. on each shift shaft has at least one shift fork fixed to it, which engages in shift sleeves and via which, depending on the pivoting of the shift lever, the shift shaft and thus the shift I sleeve is displaced or pivoted in one direction or the other and one of two of the in-line Engages gears. For individual gears, such as first or reverse gear, it is desirable to avoid incorrect shifting or damage to the transmission to avoid that these cannot be indented easily. To achieve this it is known to individual To block the gears of a gearbox against unintentional engagement of the gear with special locking devices. These known locking devices are components of the gearbox that are each manufactured for themselves have to be mounted and which are therefore complex and inexpensive in terms of production and assembly.

The invention is therefore based on the object of the switching device to improve a gear change transmission of the type mentioned so that the desired blocking or locking device for switching on a gear step without significantly greater construction costs and in particular without additional movable ones Components can be achieved.

·· Il till Il t ·

• · 111 ι <a ·

• t t ι. : ι ι ■ ti. • · ■ ι · iii

• ' ι ···

- 3 - 1I.05.1982

Vl H

The object is according to the invention by the characterizing Part of claim 1 contained features solved.

The switching device according to the invention has the advantage that it locks or blocks a gear step without additional Components enables and can thus be produced inexpensively and without additional assembly effort.

The features contained in claim 2 characterize a particular simple structural design of the safety locking device according to the invention.

The features of claim 3 achieve that the inventive Locking device only comes into effect at a selected gear. It is within the scope of the invention of course possible, further selected gear steps can also be selected in any way by further offset stops to block.

Finally, the features of claims 4 and 5 also characterize further advantageous embodiments of the locking device according to the invention according to claim 1.

An exemplary embodiment of the invention is shown in the drawing.

Show it:

Pig. 1 in a front view partially a shift lever with the protruding into the transmission housing and with a selector shaft in operative connection with the selector finger and the one behind it stop according to the invention.

• ι · t ·. lit ···· L

• lit ····,

III 111 ···· *

the li.05.i982 k

V.l. Ill I.

Pig. 2 shows the switching device from Pig in a side view. 1 with the stop according to the invention in locked position.

Pig. 3 shows the switching device from Pig in a side view. 1 after inserting the non-blocking Ganges.

4 shows the switching device in a front view if the lock is released.

Fig. 5 shows the price division of the lock from Fig. 1 in one Side view.

Fig. 6 The position of the shift lever after engaging the lockable gear.

Figures 1 and 4 show the shift lever dome of a transmission housing 1 for receiving and storing a shift lever 2. The shift lever 2 stands over a shift lever finger 3 »with a shift shaft 4 in operative connection, from which the individual gear steps are inserted via claws and shift sleeves (not shown). In the switching device, the respective aisle is set by pivoting the switching shaft 4 about its longitudinal axis 5 and by moving it in the direction of the longitudinal axis 5 the respective gear calls are engaged,

Of course, it is conceivable within the scope of the invention that, instead of one switching shaft 4, several switching shafts lying next to one another can be used.

From Fig. 1 it can be seen that the shift lever 2 in the shift lever * dom 1 is mounted in a cardanic manner about a pivot point 6 so as to be pivotable. The shift finger 3 protruding into the transmission housing is designed at its outer end as a ball 7 which fits in a cylinder bore 8 of a driver head 9 placed on the front end of the shift shaft 4 is immersed.

• ·· til · ·· ··

'"-" - "5 - 05/14/1982

V.l. 41

A stop 10 is arranged on the driver head 9 in the area between the shift finger 3 and shift shaft 4, which prevents the shift lever 2 from being pivoted counterclockwise i according to FIG is thus blocked. ί. The stop 10 consists of an assumed on the threading 9% shaped stop lug 11 and, arranged on the shift finger 3 i stopper pin 12. The stopper 10 is both at a distance from the I shift axis 5 of the control shaft 4, and a distance from the ■ \ Bore longitudinal axis 13 arranged, which is in the neutral position of the

Shift lever 2 together with the longitudinal axis 14 of the shift lever 2.

I falls.

ϊ In Fig. 1, the selector shaft 4 has been moved over the selector lever 2 by ei-I NEN certain angular amount rotated about the longitudinal axis 5 in a desired I aisle. Within the selected aisle lane you can

I now have two gear steps in a row by shifting the shift I wave 4 in opposite directions on the longitudinal axis

fj 5 are inserted. This takes place via the shift claws firmly attached to the shift shaft 4 I, which are in engagement with the respective ρ shift sleeves and thus engage a gear when the shift shaft 3 is moved. 10 is in the position shown in Fig. 1 position I of the switching shaft 4 is the stop in the blocking position, 'h because the stop lug 11 and the stopper pin 12 abut against each other. ii Shifting the selector shaft 4 to the right in the direction of the arrow 'j (FIG. 2) is not possible, so that the gear lying in this sliding direction I is blocked.

I Since the stop 10 only allows the sliding movement of the selector shaft 4 in Blocked in the direction of the arrow, the gear in the opposite sliding direction (Fig. 3) can be engaged without hindrance.

According to the exemplary embodiment, the blocking takes place only for a gear step located within an aisle. Of course it is conceivable within the scope of the invention that by arranging one or more stops 10 in other aisle alleys the locking far higher gears can be reached.

ti

ι I ·

I I

- 6 - IM.05.1982

Vl m

From Pig. 4 to 6 it can be seen that by pressing down of the shift lever 2 in the longitudinal direction of the stop 10 or the Lock to block the gear step lifted and the blocking face Qangstufe by pivoting the shift lever 2 against the Clockwise (Fig. 6) can be inserted.

Claims (5)

• · 7900 Ulm / Donau, May 14th, 1982 Our reference: Vl hl ESP Dah / b Claims Switching device for a gear change transmission of vehicles » in particular commercial vehicles that consist of a selector shaft for switching the individual Qangstufe and one with the selector shaft cooperating shift lever consists, characterized in that between "shift lever (2) and shift shaft (M) a Stop (10) is provided to prevent shifting shaft (Ό in one direction). 2. Switching device according to claim 1, characterized in that the stop (10) consists of a ^{stop lug (11) arranged on the selector shaft (1} O) and a pin (12) arranged on the selector finger (3) which lie against one another in the blocking position. 3. Switching device according to claim 1 or 2, characterized in that the stop ^{lug (11) is integrally formed on a driver head (9) placed on the front end of the switching shaft (1} O), that the driver head (9) has a cylindrical bore (8), in which the shift finger (3) is appropriately guided and that in the neutral position of the shift lever (2) the stop (10) is opposite the shift lever longitudinal axis (I ¹ O laterally offset). 4. Switching device according to one of Claims 1 to 3, characterized in that the stop (10) can be brought out of action ^{by moving the switching lever (2) in the direction of a longitudinal axis (I 1 O).} 5. Switching device according to one of claims 1 to 4, characterized in that the stop lug (11) is arranged at a distance from the sliding axis (5) of the shift shaft ( ¹ O and the shift finger (3) on the driver head (9).