A parking lock device for a gearbox and a method of compensating for acceleration spikes

Abstract

Parking lock device (1) for a gearbox in a vehicle, having an electric actuation device for actuating a parking lock via a mechanism and an emergency actuator (2) with a reciprocating electromagnet (2b) and a spring energy store (5) to insert the parking lock. The spring energy store (5) has a pawl (4) rotatable about a point of rotation (4a), which is connected with the reciprocating electromagnet (2b) and a mass element (6) which is rotatably connected with the pawl (4) about a second point of rotation (D1, 12).

Description

Technical Field

[0001] The present invention relates to a parking lock device for a transmission in a vehicle, the parking lock device having an electric actuator for actuating the parking lock via a mechanism and an emergency actuator having a reciprocating electromagnet at a spring accumulator for inserting the parking lock.

[0002] The present invention also relates to a method for preventing unintentional release caused by acceleration acting on the movable armature of a reciprocating electromagnet of a parking lock device. Background Technology

[0003] A motor vehicle transmission system device is known from DE 10 2012 012 673 A1, comprising: a gearbox having at least one gearbox shaft and a gearbox housing; a parking lock for form-fitting locking of the motor vehicle transmission system, the parking lock having a parking ratchet disposed torsionally on the gearbox shaft and a locking element connected to the gearbox housing, the locking element being configured to form-fit into the parking ratchet; and a shift drum actuation mechanism having a shift drum for operating the parking lock and the gearbox.

[0004] WO 2021 121 484A1 relates to a parking lock for a motor vehicle, the parking lock having: a pawl for reversibly engaging in a parking ratchet; a spring-preloaded operating element for inserting the pawl into the parking lock; an actuator for moving the operating element; and a coupling element between the actuator and the operating element.

[0005] The electromechanical parking lock includes: a locking element for reversibly engaging with a parking ratchet; an operating element preloaded by an actuating spring for inserting the locking element into the parking ratchet; a motor having an adjusting unit for moving the operating element from a locked position against the spring force of the actuating spring to an unlocked position; and a reciprocating electromagnet that holds the operating element preloaded via a safety element in the unlocked position. The parking lock has an emergency locking position in which the parking lock is unlocked, and in which the locking element can be moved by the motor even if the reciprocating electromagnet fails. By moving the safety element out of its safe position, the preload on the operating element can be released, allowing the operating element to move into the locked position and thus lock the parking lock. The reciprocating electromagnet and the switching motor can be the primary and / or secondary insertion paths.

[0006] When a vehicle is used under extreme conditions, peak acceleration acts on all components of the vehicle. For safety reasons, some vehicle manufacturers therefore require parking locks up to 100g to be fully functional in all spatial directions. Full functionality here means that the parking lock must not be accidentally inserted. An unintentional release of the reciprocating electromagnet causes the emergency locking device to unlock, leading to the insertion of the parking lock. If this occurs while driving, it causes unintentional clicking of the pawl on the parking ratchet and generates unintentional noise. If the parking lock is inserted at less than the permissible number of turns, it causes the vehicle to stop. Summary of the Invention

[0007] The purpose is to prevent the reciprocating electromagnet from being accidentally released during driving, especially during off-road driving, due to impact or vibration.

[0008] The objective is achieved by a parking lock device for a transmission in a vehicle, the parking lock having an electric actuator actuated by a mechanism and an emergency actuator, the emergency actuator having a reciprocating electromagnet at a spring accumulator for inserting the parking lock, wherein the spring accumulator has a pawl rotatable about a pivot point, the pawl being connected to the reciprocating electromagnet and a mass element rotatably connected to the pawl about a second pivot point.

[0009] Advantageously, the spring mechanism can be released via a pawl using a first rotational motion, wherein the compensating rotational motion is initiated by a second rotational motion via a mass element having inertial mass.

[0010] The mass element resists the unintentional acceleration of the armature of the reciprocating electromagnet caused by the vehicle.

[0011] Here, the mass element is engaged in the pawl by a ball joint and performs rotational motion around a rotating element hinged to the housing of the spring accumulator.

[0012] The mass element is balanced in such a way that the inertial force acting on it produces rotational motion only about the desired axis. This moment of inertia matches the mass inertia of the armature to be compensated.

[0013] Furthermore, the objective is achieved by a method for compensating for acceleration peaks in a parking lock device, wherein the acceleration peaks are compensated for by operating an emergency actuator device via a reciprocating electromagnet and a spring accumulator, and the movement thereby triggered by the armature of the reciprocating electromagnet is compensated for by the opposing movement at the spring accumulator. Attached Figure Description

[0014] Figure 1 The functional principle of the present invention is illustrated schematically.

[0015] Figure 2 This shows a portion of a parking lock system with an emergency actuator assembly.

[0016] Figure 3 A cross-section through the emergency actuator is shown.

[0017] Figure 4 A view of the emergency actuator is shown.

[0018] Figure 5 Showing another view. Detailed Implementation

[0019] In addition to the parking lock with locking pawl 3, the pass-through (in) Figure 2 In addition to the conventional operating mechanism of the electric motor (not shown), the parking lock device 1 also includes an emergency actuator assembly 21, which independently releases the locking pawl 3. If the electric motor fails to release the locking pawl (even though the vehicle and / or driver wish to activate the function), a reciprocating electromagnet 2 is used. This function is a redundant safety feature.

[0020] Normal operation of the parking lock is performed in a known manner via a toothed element 7, which is connected to the parking lock operating device. A lever mechanism 20 is indicated in the parking lock device 1, which is used to engage the locking pawl 3 by rotating it about axis 3b. The pawl teeth 3a engage with and secure the parking ratchet of the vehicle's transmission.

[0021] The toothed element 7 is also used in the preload spring accumulator 5. Figure 2 As seen in the image, the toothed element 7 is connected to the piston rod 11 via the hinge 7b and is fixed to the housing via the hinge point 7a. The movement of the toothed element 7 around the hinge point 7a causes the piston rod 11 to move linearly within the housing 9 of the spring accumulator 5. Therefore, after the parking lock is inserted, the spring 10 of the spring accumulator 5 is preloaded.

[0022] Emergency operations are performed via reciprocating electromagnet 2. The armature 2a of reciprocating electromagnet 2 is connected to the locking pawl 4 of spring accumulator 5 via coupling rod 2d, and the locking pawl can rotate around its rotation axis 4a when the reciprocating electromagnet is energized.

[0023] The coupling rod 2d has a ball head 2e that acts on a ball 4c of the locking pawl 4. The pawl 4 is mounted end-side on the housing 9 of the spring accumulator 5. The housing 9 of the spring accumulator 5 contains a cylindrical space in which the spring 10 presses the piston rod 11 against the stop plate 13. The housing 9 terminates in a connecting portion 9a for the lever.

[0024] The locking pawl 4 is rotatably mounted on the housing 9 around the rotation point 4a. An emergency operation is performed when the reciprocating electromagnet 2 is energized and the armature 2a rotates the locking pawl 4 out of the locking groove of the piston rod 11 around the rotation point 4a via the coupling rod 2d, thereby unlocking the piston rod. Then, a spring 10 extending inside the housing 9 allows the piston rod 11 to move relative to the housing 9, which operates the lever mechanism 20.

[0025] To prevent the armature 2a of the reciprocating electromagnet 2 from moving longitudinally along the armature due to extreme acceleration of the vehicle, i.e., moving towards the normal emergency operation, and thus unintentionally releasing the spring energy storage 5, a mass element 6 is installed, which compensates for the inertial force of the armature 2a.

[0026] exist Figure 1 The diagram schematically illustrates mass and acceleration. The unintentionally accelerated mass m1 of the armature moves in the longitudinal direction of the armature, which should be prevented. The accelerating force at ball 4c of pawl 4 is F1 = m1 * a. Mass element 6 is rotatably supported at a point of rotation D1. Mass element 6 has a mass m2, with the main mass extending at the lower end of the mass element. The point of rotation D1 is not centrally located in the longitudinal extension of mass element 6, resulting in a radius r2 from the point of rotation to the point of action at pawl 4. There exists a radius r3 from the point of rotation D1 to the center of mass of mass m2. To compensate for the accelerating force F1 at ball 4c, an accelerating force F3 must exist. This accelerating force F3 consists of an accelerating force F2, which is defined by the inertial mass m2 * a and converted by the lever arm ratio. Therefore, F3 is m2 * a * (r3 / r2).

[0027] This prevents the pawl 4 from twisting and the spring accumulator from being released.

[0028] For a normal release, the pawl 4 rotates around the pivot point 4a, thereby unlocking the piston rod 11. The spring 10 can then relax, causing the piston rod 11 to move into the housing. This causes the lever mechanism 20 to move when the toothed element 7 is upright and engages the parking lock.

[0029] List of reference numerals

[0030] 1 Parking lock device

[0031] 2 Reciprocating electromagnets

[0032] 2a armature

[0033] 2D coupling rod

[0034] 2e ball head

[0035] 3 locking pawls

[0036] 3b axis

[0037] 3a locking teeth

[0038] 4 locking pawls

[0039] 4a Rotation point

[0040] 4b groove

[0041] 4c ball

[0042] 5-Spring Energy Storage

[0043] 6 mass components

[0044] 6a spherical joint

[0045] 7-tooth element

[0046] 7a hinge point

[0047] 7b hinge

[0048] 8 springs

[0049] 9 shells

[0050] 9a shaft connection part

[0051] 10 springs

[0052] 11 Piston Rod

[0053] 12 rotating elements

[0054] 13 Stop Plate

[0055] 20 leverage institutions

[0056] 21 Emergency Actuator Assembly

Claims

1. A parking lock device (1) for a gearbox in a vehicle, having an electric actuation device for actuating a parking lock via a mechanism and an emergency actuation device, the emergency actuation device having a reciprocating electromagnet (2) and an unlockable spring energy store (5) to insert the parking lock, characterized in that The spring energy store (5) has a pawl (4) which can rotate about a first point of rotation (4a), which is connected to the reciprocating electromagnet (2) and to a mass element (6) which is connected to the pawl (4) in a rotationally fixed manner about a second point of rotation (D1).

2. The parking lock device (1) according to claim 1, characterized in that The spring energy store (5) can be released via the pawl (4) using a first rotational movement, wherein a second rotational movement of the mass element (6) having an inertial mass (m2) is caused by a torsion of the pawl (4).

3. The parking lock device (1) according to claim 1 or 2, characterized in that The mass element (6) is accelerated by the vehicle against the armature (2a) of the reciprocating electromagnet (2).

4. A parking lock device (1) according to claim 1 or 2, characterized in that The mass element (6) is joined into the pawl (4) using a ball joint (6a) and performs a rotational movement about a rotational element (12) which is hinged on a housing (9) of the spring energy store (5).

5. The parking lock device (1) according to claim 3, characterized in that The mass element (6) is joined into the pawl (4) using a ball joint (6a) and performs a rotational movement about a rotational element (12) which is hinged on a housing (9) of the spring energy store (5).

6. A method for compensating for acceleration peaks in a parking lock device (1), wherein the parking lock device is a parking lock device according to any one of claims 1 to 5, characterized in that Acceleration peaks are equalized by operating the armature (2a) using the reciprocating electromagnet (2) and the spring energy store (5), and the inertial forces acting on the pawl (4) triggered by the armature (2a) of the reciprocating electromagnet (2) are equalized by the inertial forces of the mass element (6).

7. The method for compensating acceleration peaks in a parking lock device (1) according to claim 6, wherein the inertial forces acting on the mass element only produce a rotational movement about the desired axis, wherein the moment of inertia is coordinated with the mass inertia of the armature (2a) to be compensated.

8. The method for compensating acceleration peaks in a parking lock device (1) according to claim 6 or 7, wherein acceleration peaks do not exert forces on the pawl (4) in all spatial directions other than the Y direction, which forces would cause unintentional release.

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