DE7003306U - ACTUATING DEVICE FOR THE LOCKING OF A DIFFERENTIAL GEAR IN MOTOR VEHICLES, IN PARTICULAR AGRICULTURAL VEHICLES. - Google Patents

Description

Actuating device for locking a differential gear in motor vehicles, especially agricultural vehicles.

The innovation relates to a device for switching off the lock of a differential gear in motor vehicles, In particular. Agricultural vehicles, construction vehicles or the like., Both axle shafts through a friction clutch be non-positively locked against each other and a switching mechanism depending on the steering angle is intended to operate the friction clutch

The purpose of a differential lock is well known and is to control the relative rotation of driven wheels to prevent.

In an agricultural vehicle, esp. In a tractor, the differential lock is mainly when Plowing can be effective. A differential lock can be installed in the front axle as well as in the rear axle (be all-wheel drive) be provided. For example, when plowing, mainly when going straight ahead, the outer furrow wheel can be prevented in order to compensate for the different adhesion values and thus greater tensile forces to bring to the ground. When cornering, on the other hand, there is an activated differential lock on the front axles associated with considerable disadvantages. Once because

,: the steering ability suffers, and on the other hand the lane keeping

c tang not guaranteed. In addition, the tire

! wear, especially when driving on the road, in impermissible

: Dimensions.

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A device has become known through the DP 459 638, in which the differential gear is automatically released depending on the steering stop. Once it is suggested that two axle shafts via electromagnetic clutches, mutually set, with a certain steering stop on the power supply to these clutches is interrupted so that the differential gear is fully effective again. A Another suggestion is based on non-rigid transmission means, such as a cord drive that has a toggle mechanism operated to release a friction clutch. Hydraulic means are also proposed to solve the problem.

The proposed measures fail in the case of an agricultural one Vehicle on the one hand because of the relatively high construction costs, and on the other hand because of the inadequate operational safety.

To the demands made on agricultural vehicles with regard to the robustness and operational safety of the components used, is to be met It is therefore the task of the innovation to create a device that solves the differential gear in a purely mechanical way.

The object is achieved according to the innovation in that of components that are relatively compared to the steering angle Front axle are moved, there is a linkage connection to a switching cam and between a switching element a Friction clutch a rotatably mounted lever is used, which with a guide element on the switch cam and further rests with one arm on the switching element. The switch cam can be designed so that the differential gear only can take effect from a certain steering angle. The switching cam and the transmission lever provide simple, robust components, so that the functionality under is fully preserved in the difficult conditions in agriculture.

Each of a further development of the innovation is the differential gear constantly switched off by swiveling the switch cam around its longitudinal axis. Thus, the differential gear

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be fully effective even when driving straight ahead. Sas panning the The switching cam can advantageously be carried out from the driver's seat.

According to the innovation, a preferred embodiment consists in that the switch cam is inside the switch housing is stored. By this measure, the switch cam is particularly protected from contamination and is further away from the | Surrounding ul of the differential gear. I.

The advantages that can be achieved with the innovation are summarized in particular in the fact that a device has been created that mechanically actuates the equalizing lock allowed. The mechanical actuation is achieved from simple components with little construction effort, so that this Device can cope with the difficult operating conditions in agricultural vehicles. The operating lever, as well as the switching cam are housed inside the front axle housing, so that there are no malfunctions result from pollution.

In the drawing, an embodiment is according to the The innovation is shown and is described in more detail below. Here show:

Figure 1 is a section through a differential gear

with a friction clutch as a lock, Figure 2 shows a further embodiment according to a

differently designed coupling, FIG. 3 shows a section through a switching cam bearing according to line III III according to Figure 1

In Figure 1, a symmetry half of a differential gear 1 is shown in section. The differential gear is housed in a front axle housing 2 (shown in dashed lines) and consists essentially of a drive bevel gear 3t which is firmly connected to a housing 4 and further of two or four differential bevel gears 5, only one of which is shown, which can be rotated on an axle 6

1 III

are mounted and which are in drive connection with side shaft bevel gears 7 and 8. The axle shafts 9 and 10 and so that the bevel gears 7, 8, 5 are connected to one another in a rotationally fixed manner via a friction clutch 11. The housing 4 is included designed so that it carries at its rear end 12 inner plates 13 of the Heibungskupplung 11, while outer plates 14 are held by a displaceable plate carrier 15, which is rotatably mounted on the axle shaft 10 and is pressed against the housing 4 by a spring 16. On the disk carrier 15 is a ball bearing 17 a Hing 18 rotatable, but stationary in the axial direction, mounted. It can be seen that the differential gear can be effective by moving the plate carrier 15 against the pressure of the spring 16. Moving the slat support takes place by a device, which is to be explained in more detail below:

From components that are moved depending on the position or with the front drive wheels, for example from a tie rod 19, which is used to keep track of front wheels, not shown, there is a linkage connection 20 to a switching cam 21 inside the axle housing 2. An the control cam 22 of the switching cam 21, which has a rise 23 and 24, is a roller 25 which is rotatably arranged at the end of an angle lever 26, on. The angle lever 26 is pivotably mounted in a stationary manner in the axle housing 2 at 27. An arm 28 of the angle lever rests on the aforementioned ring 18. The position shown in Figure 1 corresponds to the locked position of the differential gear. (Straight ahead). If the front wheels are turned for cornering, the tie rod 19 adjusts the switching cam 21 via the linkage connection 20 until the roller 25 runs up on the rise 23 or 24 and the angle lever 26 pivots counterclockwise according to this embodiment. As a result, the ring 18 is displaced against the pressure of the spring 16 and the differential lock (friction clutch 11) is released. · By the choice of dimensions

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from the drawn neutral position to the beginning of the Increases 23 or 24 can be the steering lock 2.um loosening the Differential lock can be chosen arbitrarily.

In FIG. 2, an arrangement with a different friction clutch 31 is shown. A lamella carrier 29 is used here rotatably mounted on the axle shaft 10 via bath bearings 30. According to this exemplary embodiment, the lock is activated by directly moving the lamellar carrier 29 through the arm 28 solved.

Figure 3 shows a section through the switching cam along line III-III of Figure 1. The switching cam 21 can through Manual adjustment can preferably be pivoted by 90 ° from the driver's seat, 3οthat the friction clutch 11 or 31 also is released when the roller 25 is in the neutral position, i.e. the differential gear can also be effective when driving straight ahead.

Also conceivable is an embodiment in which the axis of the bearing point 27 is led out of the axle housing 2 upwards and is provided with a handle so that the Differential lock 11 by operating this hand lever, in addition to the automatic switching option, solved, bzr. can be blocked.

Of course, this device can be used to operate the Differential lock can be transferred to the rear differential gear without significant structural changes.

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Claims (3)

s Protection claims 1. Device for switching off the lock of a differential gear in motor vehicles, especially agricultural vehicles, construction vehicles or the like., Both axle shafts frictionally engaged against each other by means of a friction clutch are locked and a switching mechanism is provided depending on the steering angle for actuating the friction clutch is, characterized in that of components (19) »those when the steering wheel is relative are moved relative to the front axle, there is a linkage connection (20) to a switching cam (21) and between a switching element (18 or 29) of a friction clutch ("! 1 or 31) a pivoted lever (26) is used with a guide element (25) on the switching cam (21) and further with an arm (28) on the switching element (18 or 29) is present. 2. Device according to claim 1, characterized in that the differential lock by pivoting the switching cam (21) is constantly switched off about its longitudinal axis. 3. Apparatus according to claim 1 and 2, characterized in that the switching cam (21) inside the axle housing (2) is stored.