DE102019114967A1 - Vehicle parking lock device - Google Patents

Abstract

The invention relates to a vehicle parking lock device (1), comprising an actuator (2) and a parking lock mechanism (3), the actuator (2) interacting with the parking lock mechanism (3) in such a way that the parking lock mechanism (3) is converted into one by means of the actuator (2) Parking lock locking position and a parking lock release position can be moved, and the actuator (2) is designed as a spindle drive actuator (4), and the parking lock mechanism (3) is designed as a parking lock lever mechanism (5), with a parking lock pawl (6), a pawl bearing (7) and a pretensioning spring (8), wherein the parking lock pawl (6) is arranged pivotably in or on the pawl bearing (7) and the parking lock mechanism (3) is arranged wholly or partially in or on a parking lock frame (10), the parking lock frame (10) having at least two side walls (11) and a head wall (12), and within the parking lock frame (10) a slide (13) is guided in a linearly movable manner, and in which parking lock Rollers (14) are rotatably mounted, which are supported on the one hand against the head wall (12) of the parking lock frame (10) and on the other hand against the contour of a pawl guide surface (15) of the parking lock pawl (6), on the one hand the spindle drive actuator (4) and on the other hand, the biasing spring (8) act on the slide (13) for the purpose of its displacement, characterized in that the head wall (12) of the parking lock frame (10) comprises a tensioning means (16) formed in or on the head wall (12) that is resiliently elastic acts in the direction of the parking lock pawl (6) on the parking lock rollers (14).

Description

The invention relates to a vehicle parking lock device, comprising an actuator and a parking lock mechanism, the actuator cooperating with the parking lock mechanism in such a way that the parking lock mechanism can be moved into a parking lock locking position and a parking lock release position by means of the actuator, and the actuator is designed as a spindle drive actuator, and the parking lock mechanism is designed as a parking lock pivot mechanism is, with a parking lock pawl, a pawl mounting and a biasing spring, the parking pawl is pivotably arranged in or on the pawl mounting and the parking pawl is acted upon by the biasing spring so that the parking pawl automatically without actuation of the actuator in its parking lock position, whereby the parking pawl can be pivoted into the parking lock Parking lock locking position of the vehicle parking lock device engages positively in a parking lock wheel and thus locks rotation of the parking lock wheel the parking lock pawl is not in engagement with the parking lock wheel in the parking lock release position, so that a rotation of the parking lock wheel is enabled, and the parking lock mechanism is arranged wholly or partially in or on a parking lock frame, the parking lock frame having at least two side walls and a head wall, and within the Parking lock frame a carriage is guided in a linearly movable manner, and in which parking lock rollers are rotatably mounted, which are supported on the one hand against the head wall of the parking lock frame and on the other hand against the contour of a pawl guide surface of the parking lock pawl, on the one hand the spindle drive actuator and on the other hand the biasing spring on the slide to For the purposes of its displacement.

State of the art

Vehicle parking lock devices are known from the prior art.

In the parking lock locking position of a vehicle parking lock device, vibrations can act on the vehicle parking lock device from the outside. This can occur, for example, when a vehicle is pulled from a towing vehicle onto a trailer while the parking lock is locked and the vibrations, for example from the winch of the towing vehicle or the hydraulic trailer, are transferred to the vehicle parking lock via the vehicle body. These vibrations can lead to the parking lock pawl inadvertently disengaging from the positive engagement with the parking lock wheel and the vehicle not subsequently being secured against unintentional rolling.

It is therefore the object of the invention to provide a vehicle parking lock in which the parking lock pawl is held securely in its parking lock locking position even under the influence of vibrations.

This object is achieved by a vehicle parking lock device, comprising an actuator and a parking lock mechanism, the actuator cooperating with the parking lock mechanism in such a way that the parking lock mechanism can be moved into a parking lock locking position and a parking lock release position by means of the actuator, and the actuator is designed as a spindle drive actuator, and the parking lock mechanism as Parking lock pivot lever mechanism is designed with a parking lock pawl, a pawl bearing and a preloading spring, the parking pawl being pivotably arranged in or on the pawl mounting and the parking pawl is acted upon by the pretensioning spring in such a way that the parking pawl is automatically in its parking lock locking position without actuation of the actuator in the parking lock locking position of the vehicle parking lock device engages positively in a parking lock wheel and thus a rotation of the parking lock wheel s locks and the parking lock pawl is not in engagement with the parking lock wheel in the parking lock release position, so that a rotation of the parking lock wheel is enabled, and the parking lock mechanism is arranged wholly or partially in or on a parking lock frame, the parking lock frame having at least two side walls and a head wall, and Within the parking lock frame, a slide is guided in a linearly movable manner, and in which parking lock rollers are rotatably mounted, which are supported on the one hand against the head wall of the parking lock frame and on the other hand against the contour of a pawl guide surface of the parking lock pawl, with the spindle drive actuator on the one hand and the biasing spring on the Carriage for the purpose of its displacement is characterized in that the head wall of the parking lock frame comprises a bracing means formed in or on the head wall that is resiliently elastic in the direction of the parking lock pawl on the parking lock roller n acts.

In this way it can be achieved that a simple and secure releasable securing of the parking lock pawl in its locking position can be ensured even under the influence of vibration.

First, the individual elements of the claimed subject matter of the invention are explained in the order in which they are named in the set of claims, and particularly preferred embodiments of the subject matter of the invention are described below.

Vehicle parking lock device

To prevent motor vehicles from rolling away, z. B. to secure on a slope, vehicles can have a vehicle parking lock device, which causes a positive locking of the driven vehicle wheels within the vehicle drive train and thus prevents the vehicle from rolling. In this way, a function similar to a handbrake is implemented in the vehicle, whereby a handbrake is usually intended to prevent frictional locking of the driven vehicle wheels; in the case of a vehicle parking lock device, this is effected by a form-fitting securing within the vehicle drive train.

In particular, when non-mechanical components are installed in a vehicle drive train of a motor vehicle, such as in automatic transmissions with hydrodynamic torque converters or vehicles with electric drive, vehicle parking lock devices are used to prevent the vehicle from unintentionally rolling away in the event of a vehicle standstill or with the engine switched off. For this purpose, the vehicle parking lock device can be activated mechanically, electrically and / or hydraulically by the driver by means of a parking lock operating device.

The vehicle parking lock device typically blocks a shaft within the power flow in a vehicle drive train, for example an automatic transmission or a downstream differential axle drive. The shaft to be blocked is selected in such a way that blocking it reliably prevents the drive wheels of the motor vehicle from moving.

When parking a vehicle, for example on a slope, the vehicle weight, depending e.g. Generate large forces on the parking lock mechanism from the wheel diameter and the gear ratio. Since these high forces must be overcome when unlocking the vehicle parking lock device on a slope, a purely manual unlocking cannot always be carried out safely and easily for a user, so that electrical and / or hydraulic actuators have now become established to effect this unlocking with the aid of auxiliary power .

To control the actuator and / or the parking lock mechanism, a parking lock operating device is typically arranged in the passenger compartment of the motor vehicle. In principle, various mechanical, electrohydraulic and also electromechanical parking lock operating devices are known. Mechanical parking lock operating devices for actuating the vehicle parking lock device include, for example, a Bowden cable between the selector lever arranged in the passenger compartment and parking lock technology. In modern motor vehicles, the shift commands from the parking lock operating device are generally transmitted exclusively by means of electrical or electronic signals. With regard to a vehicle parking lock device, this means, in other words, that the vehicle parking lock device is also generally operated electrically, electrohydraulically and / or hydraulically.
In addition to manual actuation of the parking lock operating device by a user, the vehicle parking lock device can also be actuated automatically under certain circumstances, for example when the parking lock is automatically engaged when the ignition key is removed or the motor vehicle is left.

A vehicle parking lock device typically comprises an actuator which acts on a parking lock mechanism for the purpose of locking the vehicle parking lock device, which then brings about a positive locking within the vehicle drive train to block the driven vehicle wheels.

Actuator

Actuators convert mechanical, hydraulic or electrical input variables into a mechanical movement. Although an actuator can in principle also be operated manually, actuators powered by external energy with an actuator drive have established themselves. An actuator comprises an actuator drive and an actuator mechanism, the actuator drive interacting with the actuator mechanism in such a way that a movement of the actuator mechanism results from a movement of the actuator drive.

In accordance with its actuator drive principle, an actuator can in particular be selected from the group of electromotive actuators, electromechanical actuators, hydraulic actuators, electrohydraulic actuators or electrochemical actuators.

Parking lock mechanism

The parking lock mechanism converts the movement acted upon by the actuator into a movement acting on the drive train of the vehicle for the purpose of positive locking and blocking of the driven vehicle wheels.

Spindle drive actuator

Spindle drive actuators convert a rotary into a translational movement. The linear actuators designed as spindle drive actuators have in common that they are formed from a spindle, a spindle nut and - if available - between these planetary rolling elements arranged over the circumference. Here, the spindle, spindle nut and - if present - planetary roller bodies have profiles in order to transmit a rotary movement between the spindle and spindle nut, with one of the components - spindle or spindle nut - being rotationally driven and the other component with a non-rotatable arrangement along the longitudinal axis of the spindle around one of the The set translation is shifted according to the axial travel.

In its simplest embodiment, a spindle drive actuator can consist of a spindle with a spindle nut that surrounds the spindle and engages in the spindle thread. The thread flanks of the spindle thread and the spindle nut thread slide off one another.

In order to reduce the sliding friction of the thread flanks of the spindle thread and the spindle nut thread, rolling elements can also be arranged between the spindle and the spindle nut, so that there is no sliding friction between the thread flanks in gear engagement, but only rolling friction. Depending on the shape of the rolling elements, a distinction is made between ball screw actuators and roller screw actuators.

Parking lock lever mechanism

With a parking lock lever mechanism, the movement acted upon by the actuator is converted into a movement acting on the drive train of the vehicle for the purpose of positive locking and blocking of the driven vehicle wheels by means of a parking lock pawl pivotably mounted in the parking lock lever mechanism. Here, the parking pawl can pivot about a parking pawl bearing between its locked position and its release position. The parking lock pivot lever mechanism can in particular comprise a parking lock pawl and a parking lock pawl mounting, the parking lock pawl being pivotably received in the parking lock pawl mounting.

Parking lock latch

The parking lock pawl is used to create a positive, detachable connection between the parking lock mechanism and the vehicle drive train.

In its locking position, the parking lock pawl engages the vehicle drive train with a positive fit, so that rotation of the driven vehicle wheels is blocked. In its release position, the parking lock pawl is spaced apart from the vehicle drive train, that is, it is not in positive engagement with it, so that the driven vehicle wheels can rotate.
For this purpose, a corresponding parking lock wheel, for example, is formed within the vehicle drive train, into which the parking lock pawl engages in a form-fitting manner to secure the vehicle against unintentional rolling.

In a parking lock pivot lever mechanism, the parking lock pawl can be pivoted about a parking lock pawl mounting between its locked position and its release position.

Preload spring

The pretensioning spring is usually in a pretensioned state in order to move the parking lock pivot lever mechanism into a predefined state under spring force. As a rule, the biasing spring acts directly or indirectly on the parking lock pawl in order to pivot it out of its locking position or into its locking position. In this way, for example, a "normally close" mode of operation of the parking lock lever mechanism can be implemented, in which, after an electrical or hydraulic fuse of the vehicle parking lock device is no longer in its unlocked position, the parking lock pawl of the parking lock lever mechanism is pivoted into its locking position under spring force.

Parking lock frame

The parking lock pivot lever mechanism also has a parking lock frame, on which in particular the parking lock pawl and the spring preloading mechanism are arranged. The parking lock frame has the function of receiving and arranging these elements of the parking lock pivot lever mechanism in a defined position relative to one another, so that their geometric relationships and / or kinematic relationships to one another are defined.

Particularly preferred embodiments

According to a preferred embodiment of the invention, it can be advantageous for the bracing means to be shaped as a tongue that is resiliently designed on the head wall. In this way it can be achieved that a particularly simple embodiment of a bracing means is provided, in which in particular the resilient properties are easily adjustable and reproducible.

It can furthermore be advantageous for the bracing means to be formed from a U-shaped punching in the head wall, which enables a particularly simple design of the bracing means in terms of manufacturing technology.

In a further development of the invention, it can furthermore be preferred that the tensioning means has a section curved towards the parking lock gear at its distal end, so that the spring-elastic effect of the tensioning element can be adjusted particularly well and, furthermore, a certain form fit with the parking lock rollers can be established through the curvature .

The invention is explained in more detail below with reference to figures without restricting the general inventive concept.

• 1 die erfindungsgemäße Fahrzeugparksperrenvorrichtung im Verrieglungszustand gezeigt in einer schematischen Querschnittsansicht
• 2 die erfindungsgemäße Fahrzeugparksperrenvorrichtung in ihrer Freigabeposition
• 3 eine Detailansicht des Kopfteils des Parksperrenrahmens in eine Auf- und Seitenansicht
• 4 eine Detaildarstellung des Parksperrenrahmens in einer isometrischen Perpektivansicht

Show it:

• 1 the vehicle parking lock device according to the invention shown in the locked state in a schematic cross-sectional view
• 2 the vehicle parking lock device according to the invention in its release position
• 3 a detailed view of the head part of the parking lock frame in a top and side view
• 4th a detailed representation of the parking lock frame in an isometric perspective view

The 1 shows an embodiment of the vehicle parking lock device according to the invention 1 . This includes the basic elements of the actuator 2 and the parking lock mechanism 3 . The actuator 2 works in this way with the parking lock mechanism 3 together that the parking lock mechanism 3 by means of the actuator 2 is movable into a parking lock locking position and a parking lock release position. In 1 is the vehicle parking lock device 1 in their parking lock locking position and in the 2 in their parking lock release position, which will be discussed in more detail below.

The actuator 2 is used as a spindle drive actuator 4th formed, the motor drive of the actuator 2 is not explicitly shown. The parking lock mechanism 3 on which the spindle drive actuator 4th acts is as a parking lock lever mechanism 5 designed. It is essentially formed from the slide 13th , the parking lock latch 6th , the latch bearing 7th as well as a preload spring 8th . The parking lock latch 6th can be swiveled in or on the pawl bearing 7th arranged.

The parking lock latch 6th is so from the preload spring 8th applied that the parking lock pawl 6th is automatically pivotable into its parking lock locking position without actuation of the actuator. The pretensioning spring designed as a spiral spring 8th is at one end on the linearly movable carriage 13th tied and with its other end to an unspecified one and to the parking lock pawl 6th molded swivel lever. The sled 13th is also with the spindle drive actuator 4th coupled via an unspecified pressure plate, by means of which the spindle drive actuator 4th the sledge 13th against the bias spring 8th shifts.

The parking lock latch 6th intervenes in the in 1 parking lock position of the vehicle parking lock device shown 1 form-fit with its parking lock pawl in the toothing of the parking lock wheel 9 locks a rotation of the parking lock wheel 9 . Is the parking lock pawl 6th , as in 2 shown, in their parking lock release position not in engagement with the parking lock gear 9 so is one rotation of the parking lock gear 9 enables.

The parking lock mechanism 3 is in or on the parking lock frame 10 arranged. The parking lock frame 10 has the two side walls 11 and the head wall 12th on. The parking lock frame 10 is made of metal sheets that are punched and partly also bent. This allows the parking lock frame 10 Manufacture particularly inexpensive and easy.

Inside the parking lock frame 10 is the sled 13th recorded and guided linearly movable. In the sledge 13th are the two parking lock roles 14th arranged one above the other rotatably in corresponding recesses in the side walls of the carriage 13th stored. The parking lock rollers 14th on the one hand support themselves against the head wall 12th of the parking lock frame 10 now and then against the contour of the pawl guide surface 15th the parking lock latch 6th . Will now be the sled 13th by the spindle drive actuator 4th or the preload spring 8th linear in the parking lock frame 10 shifted, then the lower one of the parking lock rollers rolls 14th on the contour of the parking lock pawl 6th and swivels it around the pawl bearing 7th according to the linear displacement direction of the slide 13th from the parking lock wheel 9 out or into the parking lock gear 9 inside.

The head wall 12th of the parking lock frame 10 points in the head wall 12th molded bracing means 16 on that resiliently in the direction of the parking lock pawl 6th on the parking lock rollers 14th acts. The tension means 16 is resilient as a spring on the head wall 12th formed tongue and has at its distal end a parking lock gear 9 curved section. This engages behind the vehicle parking lock device in the parking lock locking position shown 1 the parking lock rollers 14th and thus secures resiliently over the parking lock rollers 14th the positioning of the parking lock pawl 6th in their parking lock locking position.

2 shows them off 1 known vehicle parking lock device 1 in their parking lock release position, in which the parking lock pawl 6th from the parking lock wheel 9 is pivoted out and is not in engagement with this. To this operating state of the vehicle parking lock device 1 The spindle drive actuator is to be brought about 4th extended and has the sled 13th against the bias spring 8th linear in the parking lock frame 10 postponed. The parking lock rollers 14th are on the contour of the pawl guide surface 15th in the direction of the preload spring 8th unrolled. Due to the contour of the pawl guide surface 15th is the parking lock latch 6th from the parking lock wheel 9 towards the head wall 12th of the parking lock frame 10 swiveled out.

The parking lock roles 14th the tensioning means designed as a resilient tongue 16 rolled over, so that in the parking lock release position shown, the vehicle parking lock device 1 no spring force from the tensioning means 16 on the parking lock rollers 14th and consequently on the pawl guide surface 15th the parking lock latch 6th is exercised.

3 shows a detailed view of the head wall 12th of the parking lock frame 10 in a top view and in a side view.

The tension means 16 is resilient as a spring on the head wall 12th trained tongue, which by means of a U-shaped cut in the head wall 12th is formed. The spring force can be configured according to size and direction via the geometric design of the punching. The 3 also shows that the bracing means 16 at its distal end a parking lock wheel that is not paved 9 having curved section towards. As a result, both the spring force of the bracing means 16 further adjusted as well as a certain form fit with the parking lock rollers 14th by the top of the parking lock rollers 14th on the curved portion of the bracing means 16 is applied. This is from the synopsis with 1 clearly visible.

4th Finally shows a detailed illustration of the parking lock frame 10 . The parking lock frame 10 has the plate-shaped side walls 11 and the top wall, which is also plate-shaped 12th . The side walls 11 are arranged plane-parallel to one another and have an essentially identical geometric and material design. Between the side walls 11 is the one out 3 known head wall 12th inserted, with the side walls 11 and head wall 12th are separate components.

The invention is not limited to the embodiments shown in the figures. The above description is therefore not to be regarded as restrictive but rather as explanatory. The following claims are to be understood in such a way that a named feature is present in at least one embodiment of the invention. This does not exclude the presence of further features. If the claims and the above description define “first” and “second” features, this designation serves to distinguish between two similar features without defining a priority.

List of reference symbols

1

Vehicle parking lock device

2

Actuator

3

Parking lock mechanism

4th

Spindle drive actuator

5

Parking lock lever mechanism

6th

Parking lock latch

7th

Latch bearing

8th

Preload spring

9

Parking lock wheel

10

Parking lock frame

11

side walls

12

Head wall

13th

Sledge

14th

Parking lock rollers

15th

Pawl guide surface

16

Tension means

Claims (4)

Vehicle parking lock device (1), comprising an actuator (2) and a parking lock mechanism (3), the actuator (2) cooperating with the parking lock mechanism (3) in such a way that the parking lock mechanism (3) is moved into a parking lock locking position and a parking lock release position by means of the actuator (2) is movable, and the actuator (2) is designed as a spindle drive actuator (4), and the parking lock mechanism (3) is designed as a parking lock pivot lever mechanism (5), with a parking lock pawl (6), a pawl bearing (7) and a pretensioning spring (8), the parking lock pawl (6) being pivotable in or on the pawl bearing (7) is arranged and the parking lock pawl (6) is acted upon by the pretensioning spring (8) that the parking lock pawl (6) can be automatically pivoted into its parking lock locking position without actuating the actuator, the parking lock pawl (6) in the parking lock locking position of the vehicle parking lock device (1) in a form-fitting manner The parking lock wheel (9) engages and thus blocks rotation of the parking lock wheel (9) and the parking lock pawl (6) in the parking lock release position is not in engagement with the parking lock wheel (9), so that the parking lock wheel (9) can rotate, and the parking lock mechanism (3) is arranged wholly or partially in or on a parking lock frame (10), the parking lock frame (10) having at least two side walls (11) and a top wall (12), and a slide (13) which is linearly movable within the parking lock frame (10) is guided, and in which parking lock rollers (14) are rotatably mounted, which are on the one hand against the Kopfw and (12) of the parking lock frame (10) and on the other hand against the contour of a pawl guide surface (15) of the parking lock pawl (6), on the one hand the spindle drive actuator (4) and on the other hand the biasing spring (8) on the slide (13) for The purpose of moving it is characterized in that the head wall (12) of the parking lock frame (10) comprises a tensioning means (16) formed in or on the head wall (12) that acts elastically in the direction of the parking lock pawl (6) on the parking lock rollers (14) . Vehicle parking lock device according to one of the preceding claims, characterized in that the bracing means (16) is shaped as a tongue which is resiliently formed on the head wall (12). Vehicle parking lock device according to one of the preceding claims, characterized in that the bracing means (16) is formed from a U-shaped punching in the head wall (12). Vehicle parking lock device according to one of the preceding claims, characterized in that the bracing means (16) has at its distal end a section curved towards the parking lock wheel (9).

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