PARKING BARRIER UNIT

Description

[0001] The invention relates to a parking lock assembly according to the preamble of claim 1.

[0002] Such a parking lock assembly serves as a mechanical transmission unit in vehicles with automatic transmissions for inserting a locking element into a parking lock gear when the gearshift lever is moved to the park position. A parking lock assembly of the aforementioned type is described in DE 697 07 779 T2.

[0003] A support section with a holding element is firmly attached to a front end portion of a straight, rod-like receiving body for actuating additional mechanical coupling elements to move the locking element into the desired position. The other end portion of the receiving body is provided with an engagement portion protruding from the receiving body at right angles to the longitudinal axis. The support section is axially displaceable on the receiving body over a limited travel against a spring force, while the engagement portion is coupled to the gearshift lever via additional, appropriately designed elements. Precise machining with the smallest possible tolerances is essential for reliable, exact actuation of the parking lock.

[0004] Another parking lock assembly is shown in DE 10 2005 01 0211 A1. In this parking lock assembly, the parking lock mechanism has a locking element which, in the locked state, locks a pawl engaged in a parking lock gear against being forced out. The locking element is arranged on a connecting rod, with a sleeve arranged between the connecting rod and the locking element. The sleeve has a stop or stop collar which is spring-loaded by a spring device provided on the connecting rod and is pressed towards the front end of the connecting rod facing the pawl. The locking element arranged on the outer diameter of the sleeve is not spring-loaded and is not preloaded and can rotate freely to prevent the locking cone or the locking element from jamming on the connecting rod.

[0005] Various other designs of parking locks for automatic transmissions with differently designed parking lock units are shown in DE 10 2010 028 281 A1, DE 101 44 056 A1, US 2012 / 0 018 259 A1, DE 10 2007 007 681 A1, DE 10 2012 012 673 A1, DE 10 2010 061 171 A1 and 198 18 752 A1.

[0006] The present invention is based on the object of providing a parking lock assembly of the type mentioned above, which results in a precise structure and a reliable function with the simplest possible manufacturing steps.

[0007] This object is achieved with the features of claim 1. Here, it is provided that the holding element is firmly connected to the guide member in its rear region, that the guide member is sleeve-shaped and is slidably mounted on the receiving body, wherein it surrounds a partial area of ​​the front end section of the receiving body and is supported against the spring arranged on the receiving body, that the holding element is pushed onto the guide member by means of a receiving opening whose inner circumference is adapted to an outer circumference of the guide member and is fixed immovably relative to the guide member in such a way that a distance predetermined for a positionally correct coupling to the adjustment mechanism results between the holding element and the engagement section,wherein the guide member has two sections merging into one another via a shoulder, the rear section forming a section with an enlarged outer diameter, and the front section forming a sliding section onto which the retaining element is pushed and immovably fixed, and the enlarged section of the guide member is supported on the front part of the spring.

[0008] The support section with the guide member provides advantageous manufacturing options for precise construction and reliable function.

[0009] In terms of design and function, it is advantageous that the guide member is sleeve-shaped and is slidably mounted on the receiving body, surrounding a portion of the front end section and being supported against an axially extending spring arranged on the receiving body, and that the support section has a holding element which is firmly connected to the guide piece in its rear region and carries at least one support element in its front region. Precise adjustment options are achieved in that the holding element is placed on the guide member by means of a receiving opening whose inner circumference is adapted to an outer circumference of the guide member and is fixed in the correct position for coupling to an actuating mechanism. The receiving opening allows the guide member to be precisely positioned in a simple manner, and thus the length between the engagement section and the support section can be precisely adjusted.

[0010] To ensure reliable function, it is also advantageous to have the guide member have two sections that merge into one another via a shoulder, the rear section forming a section with an enlarged outer diameter, and the front section forming a sliding section to which the support section is fastened. The shoulder between the two sections of the guide member provides an additional limitation for the support section, which, when the receiving opening of the holding element is adapted to the smaller outer diameter of the front section, can be pushed onto the front section at most up to the stop against the shoulder, thereby providing additional security for engaging a locking member in a parking lock gear.

[0011] Further advantages for the structure arise from the fact that the extended section is supported on the front part of the spring, which is supported with its rear part against a rear abutment firmly attached to the receiving body.

[0012] Another advantageous measure for precise manufacturing is welding the support section to the guide member. An alternative to this method of attaching the support section to the guide member is, for example, bonding. These connection methods allow for precise length adjustment of the parking lock assembly.

[0013] Further advantageous measures for the production consist in that the holding element is U-shaped with a U-web fastened to the guide member and two U-legs bent forwards therefrom, to the front area of ​​which the at least one support element is attached.

[0014] The measures that at least one support element is designed as at least one roller which is rotatably mounted on the holding element also contribute to an advantageous function.

[0015] The measures that also contribute to an advantageous design and reliable function are that the guide member is pressed by means of the spring force in the rest position against a front abutment that is firmly attached to the receiving body in its front end area and can be pushed back to a limited extent against the spring force.

[0016] Further advantages for production and function arise from the fact that the engagement section is designed as a section bent away from the receiving body.

[0017] The invention will be explained in more detail below using exemplary embodiments with reference to the drawings. In the drawings: Fig. 1A bis 1F an assembled parking lock assembly in perspective view, a longitudinal section, a plan view, a side view, a front view and a sectional view along a line AA in a support section, Fig. 2A , 2B und 2C a perspective view, a side view and a front view of the parking lock assembly according to Fig. 1A bis 1F without support section and Fig. 3A bis 3F the support section of the parking lock assembly according to the Fig. 1A bis 1F in perspective view, top view, side view, front view, back view and in a sectional view along a line AA.

[0018] The Fig. 1A shows a parking lock assembly 1 with a receiving body 3, a laterally projecting engagement portion 31 attached to the rear end portion thereof and a support portion 2 mounted on the front end portion by means of a guide member 5. The parking lock assembly 1 is installed between an adjusting mechanism, in particular a manually operated gearshift lever, and a parking lock gear in order to engage a locking member in the parking lock gear in the parking position and to disengage it outside the parking position.

[0019] The receiving body 3 is formed by a longitudinally extending straight rod, to the rear end portion of which the engagement portion 31 is rigidly attached at a right angle, in particular bent. A helical spring 4 is arranged coaxially on the receiving body 3, which is supported at its rear end against a rear abutment 32 fixedly attached to the receiving body 3, and which is supported with its front end portion against the displaceably mounted guide member 5, which is adjustable backwards against a compressive force exerted by the spring 4 and can be moved by means of the compressive force into a front end position, which is determined by a front abutment 33 fixedly attached to the front end portion of the receiving body 3. The sleeve-shaped guide member 5, which is coaxially displaceably mounted on the receiving body 3, abuts the front abutment 33 with its front end face in the front end position, as can be seen in particular from Fig. 1B The front and rear abutments 33, 32 can be integrally formed on the receiving body 3, for example, by means of an embossing.

[0020] At a front section of the guide member 5, a holding element 20 of the support section 2 is immovably fixed relative to the guide member 5. The holding element 20 is U-shaped in plan view (axially to the engagement section 31) and is fastened by its U-web to the front section of the guide member 5, while the U-legs, which in plan view protrude symmetrically with respect to the longitudinal axis of the receiving body 3, carry support elements in the form of two cylinder-like rollers 22 between their front end regions, the axis of rotation of which runs at right angles to the longitudinal axis of the receiving body 3, as can be seen from the Fig. 1B, 1C , 1D und 1E visible. The roller-shaped support elements actuate the respective coupling elements (not shown) for engaging and disengaging a locking element in the parking gear.

[0021] As can be seen from the Fig. 1A bis 1F in connection with the Fig. 2A , 2B, 2C As can be seen further, the front section 52 of the guide member 5 merges via a shoulder 51 into a rear section of the guide member 5, which is designed as a section 50 with an expanded outer diameter compared to the front section and is supported against the front area of ​​the spring 4. The front abutment 33, on which the front end face of the guide member 5 is supported, projects radially at most to the outer circumference of the front section 52 of the guide member 5. As a result, the holding element 20, in whose U-shaped web a receiving opening 23 is introduced, can be Fig. 3A and 3Eshow, it can simply be pushed from the front onto the receiving body 3, which is pre-assembled with the guide member 5 and the spring 4, onto the front section 52 until it reaches a predetermined distance from the engagement section 31. This distance can be precisely adjusted, after which the holding element 20 is correctly fixed in position on the front section 52, e.g. by welding or gluing. The diameter of the receiving opening 23 is advantageously matched to the outer diameter of the front section 52, so that even if the fixation by means of the connecting means 6 should break, support against the shoulder 51 of the guide member 5 is achieved and a support function for actuating the parking lock is provided.

[0022] In the embodiment shown, the receiving body 3, the guide member 5 displaceably mounted thereon and the spring 4 are designed as cylindrical parts arranged coaxially to one another, whereby an exact coordination with one another and reliable function are achieved with a simple structure and easy assembly.

Claims

1. A park lock unit suitable for installation between an adjustment mechanism, in particular a manually actuated gear lever, and a park lock gear, in order to engage a locking member in the park lock gear in the parking position and to disengage it outside the parking position, the park lock unit is provided with an elongated receiving body (3), the rear end portion of which, facing away from the park lock gear in the installed state, is provided with an engagement portion (31) protruding from the receiving body (3) transversely to the longitudinal axis of the receiving body (3) and rigidly connected to the receiving body (3), and the front end portion of which, facing the park lock gear in the installed state, is provided with a support portion (2) projecting at the end and having a holding element (20), which is supported by means of a guide member (5) against the spring force of an axially extending spring (4) arranged on the receiving body (3) and is displaceably mounted on the receiving body (3) and carries at least one support element in its front region, which is suitable, in the installed state for actuating coupling elements for engaging and disengaging the locking member in the park lock gear, the spring (4) being supported with its rear part against a rear abutment (32) fixedly attached to the receiving body (3), characterized in that the holding element (20) of the support portion (2) is firmly connected to the guide member (5) in its rear region, that the guide member (5) is sleeve-shaped and is displaceably mounted on the receiving body (3), it surrounding a sub-region of the front end portion of the receiving body (3) and being supported against the spring (4) arranged on the receiving body (3), that the holding element (20) is pushed onto the guide member (5) by means of a receiving opening (23) adapted with its inner periphery to an outer periphery of the guide member (5) and is fixed immovably relative to the guide member (5) in such a way that a distance predetermined for coupling to the adjustment mechanism in the correct position results between the holding element (20) and the engagement portion (31), the guide member (5) having two sub-portions that merge into one another via a shoulder (51), the rear sub-portion forming a sub-portion (50) with an enlarged outer diameter and the front sub-portion forming a sliding portion (52) onto which the holding element (20) is pushed and immovably fixed, and that the enlarged sub-portion (50) of the guide member (5) is supported on the front part of the spring (4).

2. The park lock unit according to any of the preceding claims, characterized in that the holding element (20) is welded to the guide member (5).

3. The park lock unit according to either claim 1 or claim 2, characterized in that the holding element (20) is U-shaped with a U-web fastened to the guide member (5) and two U-legs bent forwards therefrom, to the front region of which the at least one support element is attached.

4. The park lock unit according to any of the preceding claims, characterized in that the at least one support element is designed as at least one roller (22) which is rotatably mounted on the holding element (20).

5. The park lock unit according to any of the preceding claims, characterized in that the guide member (5) is pressed by means of the spring force in the rest position against a front abutment (33) that is firmly attached to the receiving body (3) in its front end region and can be pushed back to a limited extent against the spring force.

6. The park lock unit according to any of the preceding claims, characterized in that the engagement portion is designed as a portion bent away from the receiving body (3).