DE102005024468B4 - Parking lock for transmission of a motor vehicle - Google Patents

Abstract

parking lock for transmission a motor vehicle with a shaft (9) on which a hydraulic movable operating lever (8) an actuator and one with this over an energy store (11) in torque-transmitting operative connection standing cone lever (10) are rotatably arranged, wherein the cone lever a locking device (4) is actuated, and wherein one of the cone lever (10) associated emergency unlocking device (3) one on the shaft (9) rotatably arranged emergency release lever (16), the a stop (19) provided with an outer edge (15) of the cone lever (10) in pressure-transmitting Active compound is.

Description

The The present invention relates to a parking lock for transmissions of a motor vehicle with a shaft on which a hydraulically movable operating lever an actuating device and one with this one Energy storage in torque transmitting Actual connection standing cone lever are rotatably arranged.

STATE OF THE ART

such Parking locks are in more diverse Form and design known and in use. These are mostly to electro-hydraulically insertable parking locks. The hydraulic activity However, the parking brake has the disadvantage that the vehicle is closed Parking lock and a defect in the parking brake hydraulics anymore can be moved.

From the DE 101 47 460 A1 goes out an arrangement for inserting a parking brake. In this case, an emergency actuator is provided, which is to bring the parking brake element of the parking brake still in the locked engagement position with the Parksperrenrad in disturbance of normal operation by an electric motor is mechanically decoupled from the parking lock member to turn off its self-locking and emergency actuator, for example actuated by an energy storage or powered by another auxiliary power, is caused to actuate the parking lock member of the parking brake, ie, engage the parking brake.

in this connection is not a solution provided that solves the problem, the vehicle with the parking lock closed and a defect in the Parking lock hydraulics to move.

The US 5,704,457 A describes a parking brake which comprises an actuating device with a first actuating lever which is non-rotatably mounted on a shaft and coupled via a guided around the shaft around a shaft-shaped spring with a second rotatable on the shaft arranged parking lock lever. To lock the parking brake, the actuating lever is rotated about an actuator about the axis of the shaft, wherein the rotational movement of the actuating lever is transmitted via the spring on the parking lock lever, so that it actuates a locking pawl of a locking device. The actuating lever and the locking device operated parking lock lever are in this case on the guided around the axis leg-shaped spring in torque transmitting active connection.

But Again, no solution given as a vehicle with the parking brake and a closed Defect in the parking brake hydraulics could be moved, d. h., the parking brake could be unlocked.

An improvement to that is in the DE 198 37 832 A1 to find. Thus, a parking brake is described here, which consists of a device having two discs which are arranged on a common shaft and can be operated by rotating the discs functions of the parking brake.

A first disc is a detent disc, which is on a central one Axially rotatable seated lever arms of an actuating lever and a cone lever includes. The outgoing from the central axis lever arms are here on the one hand over a piston coupling rod of a hydraulic unit and on the other via a Konuskoppelstange a locking device with a cone-shaped piston and associated with a pawl. On the central axis is next the notch additionally nor an emergency release disc arranged by a manual actuator is rotatable about the axis. The emergency unlocking disc comprises one from the point of application of the actuator to the central axis away extending Entriegelungshebelarm.

The However, the parking lock described above and its emergency release has some downside. Thus, a manual unlocking of the parking brake under spring tension, which must be kept until one Locking engages in the emergency release disk. This leads to power losses. In particular, the spring after repeated use voltage losses so that the functionality of the emergency release weakened becomes.

Furthermore, the emergency release disc, as it is connected via the pin with the first disc, also a connection to the hydraulic actuator. D. h., When actuated the Notentriegelungsscheibe is also moved firmly connected to the detent disc piston of the hydraulic actuator. This makes the emergency release difficult. In addition, there is the possibility that the emergency release can not be operated in case of malfunction in the hydraulic system. Furthermore, many components are required which are interconnected in a complicated manner. The number of components increases the susceptibility of the parking brake. Many components, especially the smaller components, such as springs on the emergency release, can weaken or even prevent the functionality of the emergency release. In case of failure of the parking brake hydraulics, the parking brake can then not unlocked. Furthermore, an exchange of these components is cumbersome.

TASK

task The present invention is therefore to provide a parking brake, which eliminates the above-mentioned disadvantages, easy to operate is still easy and with a defect in the parking brake hydraulics can be unlocked. Furthermore, little components should be provided be and be taken up little space. An exchange of individual Components should be easy to do.

SOLUTION OF THE TASK

to solution performs this task the parking brake with the features of claim 1.

Of the Power storage is a latching spring, preferably a spiral or Thigh feather sitting on the wave and one at a time in a top the cone lever is arranged. At the other end is the catch spring against a stop on the operating lever supported. The operating lever is on the opposite Side of a stop provided with another stop, which in turn bears against an outer edge of the cone lever.

Of the actuating lever is further connected to a piston coupling rod, which the operating lever connects with a hydraulic unit, as known in the market and in use are.

The Emergency unlocking device is preferably rotationally fixed to the shaft arranged and includes in addition to a triggering device not shown in detail, which is preferably arranged in the passenger compartment, the on the shaft rotatably arranged emergency release lever, which at least two Having recesses for receiving a Rastierbuchse. Consequently the emergency release lever can be locked in two positions

Of the Taper lever is at its end opposite the axle with a Cone rod, over which the cone lever actuates the locking device. The Locking device has a cone and a pawl on, wherein pawl in a unspecified Parksperrrad can intervene and block this.

present A parking lock has been created, which is a work the hydraulic unit is avoided against a large spring force. The parking brake has also been provided with very few components, so that on the one hand can be saved on manufacturing costs and on the other hand, only very little space needs to be taken.

Farther the essential elements are arranged on a shaft. These Wearing arrangement to a space saving. In addition, possible fasteners between the emergency unlocking device and the operating lever or omitted the cone lever. This will also be the cost reduced. At the same time, it is easy to replace individual Allows components.

Farther the cone lever is not fixed to the operating lever and thus with coupled to the hydraulic unit, so that the piston of the hydraulic unit in an emergency release does not necessarily have to be moved. Nevertheless, in the event of a malfunction of the parking brake hydraulics the parking lock can be unlocked manually easily.

The presently shown forms and configurations of the individual components the parking brake, such as the operating lever, the attacks or of the emergency release lever, are not subject to any restrictions However, they have proved to be most useful. Nevertheless, anyone can desired by the manufacturer Form and design are used. The different possibilities should be included in the invention.

Farther It is conceivable, the different elements, such as cone lever, Locking spring and operating lever to arrange in different order on the shaft. Important is only that the different active compounds, such as between the latch spring and the stop of the actuating lever or between the stop of the unlocking lever and the outer edge remain of the cone lever.

The Snap spring may be a coil spring or a leg spring. It can also be replaced by another conceivable energy store become. The different possibilities should be included in the present invention.

DESCRIPTION OF THE FIGURES

Further Advantages, features and details of the invention will become apparent the following description of preferred embodiments and by reference the drawing; this shows in

1 a partially broken side view of a parking lock according to the present invention in the locked position, in which a pawl blocks a Parksperrrad;

2 the parking brake in 1 after hydraulic actuation in the released position, in which the pawl releases the Parksperrrad; and

3 the parking brake in 1 after manual operation in the released position, in which the pawl releases the Parksperrrad.

According to the 1 to 3 is a parking lock within a transmission housing of an automatic transmission, not shown in detail 1 arranged, which is a hydraulic unit 2 , a manual emergency unlocking device 3 and a locking device 4 having.

The hydraulic unit 2 has a cylinder 5 and a piston displaceable therein 6 on, which has a piston coupling rod 7 with an operating lever 8th connected is. The operating lever 8th is rotatable about a shaft 9 arranged.

To the shaft 9 is still a cone lever 10 rotatably arranged, wherein the actuating lever 8th and the cone lever 10 are movable to each other. A catch spring 11 , preferably in the form of a spiral or leg spring, is also around the shaft 9 arranged. At one point is the catch spring 11 in a top 12 of the cone lever 10 inserted, at the other end is the catch spring 11 with a stop 13 on the operating lever 8th in active connection.

On the opposite side of the stop 13 is on the operating lever 8th another stop 14 provided, which with an outer edge 15 of the cone lever 10 is in active connection.

On the cone lever 10 opposite side of the actuating lever 8th is around the wave 9 rotates the emergency unlocking device 3 arranged, which in addition to a triggering device not shown in detail, which is preferably arranged in the passenger compartment, a Notentriegelungshebel 16 having. The emergency release lever 16 has at one end two recesses 17.1 and 17.2 on which the recording of a Rastierbuchse 18 serve. Thus, the emergency release lever 16 be locked in two positions.

Andernends is the emergency release lever 16 with a stop 19 provided, which in use with the outer edge 15 of the cone lever 10 , slightly below the stop 14 of the operating lever 8th , is operable.

The cone lever 10 is at his axis 9 opposite end with a Konuskoppelstange 20 provided, which in turn is a cone 21 is scheduled. The cone 21 forms together with a pawl 22 the locking device 4 out, with the pawl 22 engages in a not shown in detail Parksperrrad and this can block, as described below.

The operation of the present invention is as follows:
To insert the parking lock 1 becomes a pressure room 23 of the cylinder 5 the hydraulic unit 2 pressurized. This will cause the piston 6 in the direction of the arrow 24 to his stop in the cylinder 5 moves, as in 1 shown. With the piston 6 at the same time the piston coupling rod 7 and the operating lever 8th moves, with the operating lever 8th around the shaft 9 in the direction of the arrow 25 rotates.

This is the catch spring 11 over the stop in communication with it 13 strained, which also creates a turning force on the cone lever 10 acts as the detent spring 11 in the other side in the top 12 of the cone lever 10 is plugged in. The cone lever 10 It also gets around the wave 9 turned. The on the cone lever 10 acting force will continue over the cone tie rod 20 on the cone 21 transferred, which is in the direction of the arrow 26 emotional. He lies so long the pawl 22 until a cam of the pawl 22 to a tooth space of the rotatably connected to the output shaft of the transmission Parksperrrades when turning the same applies. Then the pawl moves in the direction of an arrow 27 and the cone 21 moves into the gap between the pawl 22 and housing wall of the transmission. This happens under relaxation of the detent spring 11 until the cone lever 10 at the stop 14 is applied.

If the parking lock to be unlocked, the piston 6 at the other end pressurized. This causes the piston to move 6 against the direction of the arrow 24 in the cylinder 5 , About with the piston 6 connected piston coupling rod 7 at the same time becomes the operating lever 8th moves, with the operating lever 8th against the direction of the arrow 25 around the shaft 9 rotates. This pushes the operating lever 8th simultaneously with his stop 14 , which with the outer edge 15 of the cone lever 10 is in operative connection, the cone lever 10 also opposite to the direction of the arrow 25 and with it around the wave 9 ,

With the rotation of the cone lever 10 around the shaft 9 against the direction of the arrow 25 gets over the cone tie rod 20 the cone 21 against the direction of the arrow 26 emotional. The pawl 22 moves against the direction of the arrow 27 under the pressure of any force accumulator and releases the park wheel.

If the parking brake must be unlocked, then the rotation with the shaft 9 connected emergency unlocking device 3 manually by means of the release device, not shown in detail, which is preferably arranged in the passenger compartment, operated. This turns the emergency release lever 16 against the direction of the arrow 25 emotional. The stop 19 of the emergency unlocking lever 16 gets to the outer edge 15 of the cone lever 10 in operative connection and thereby pushes the cone lever 10 also opposite to the direction of the arrow 25 , This is about the Konuskoppelstange 20 also the cone 21 against the direction of the arrow 26 emotional. The pawl 22 moves up and releases the parking wheel. The Rastierbuchse 18 thereby comes into engagement with the recess 17.1 ,

The parking lock 1 can no longer be inserted until the manual emergency release is canceled and the emergency release lever 16 is again in its basic position, in which the Rastierbuchse 18 with the recess 17.2 engaged. LIST OF REFERENCE NUMBERS 1 parking lock 2 hydraulic unit 3 Entriegelungseinr. 4 Verriegelungseinr. 5 cylinder 6 piston 7 Piston connecting rod 8th actuating lever 9 wave 10 cone lever 11 detent spring 12 top 13 attack 14 attack 15 outer edge 16 release lever 17 recess 18 Rastierbuchse 19 attack 20 Cone coupling rod 21 cone 22 pawl 23 pressure chamber 24 arrow 25 arrow 26 arrow 27 arrow

Claims (8)

Parking lock for transmission of a motor vehicle with a shaft ( 9 ), on which a hydraulically movable actuating lever ( 8th ) an actuating device and with this via a power storage ( 11 ) in a torque transmitting operative connection standing cone lever ( 10 ) are rotatably arranged, wherein the cone lever is a locking device ( 4 ), and wherein one of the cone lever ( 10 ) associated emergency unlocking device ( 3 ) one on the shaft ( 9 ) rotatably arranged emergency release lever ( 16 ) containing a stop ( 19 ), which with an outer edge ( 15 ) of the cone lever ( 10 ) is in pressure-transmitting operative connection. Parking lock according to claim 1, characterized in that the energy accumulator a spiral or leg-shaped latching spring ( 11 ). Parking lock according to claim 1 or 2, characterized in that the spring ( 11 ) at one end in a top ( 12 ) of the cone lever ( 10 ) and at the other end against a stop ( 13 ) on the operating lever ( 8th ) is supported. Parking lock according to claim 3, characterized in that the actuating lever ( 8th ) against the attack ( 13 ) with another stop ( 14 ) on the outer edge ( 15 ) of the cone lever ( 10 ) is present. Parking lock according to at least one of claims 1 to 4, characterized in that the actuating lever ( 8th ) via a piston coupling rod ( 7 ) a hydraulic unit ( 2 ) assigned. Parking lock according to at least one of claims 1 to 5, characterized in that the emergency release lever ( 16 ) at least two recesses ( 17.1 . 17.2 ) for receiving a Rastierbuchse ( 18 ) having. Parking lock according to at least one of claims 1 to 6, characterized in that the cone lever ( 10 ) via a cone-shaped rod ( 20 ) the locking device ( 4 ). Parking lock according to at least one of claims 1 to 7, characterized in that the locking device ( 4 ) a piston ( 21 ) and a pawl ( 22 ) having.