Bell crank and a gearshift transmission device equipped with it

Abstract

A reversing lever (2) intended for a gearshift transmission device (1), in particular a manually operable one, for transmitting gearshift and / or selection movements, which is formed integrally with at least one bearing pin (3), wherein the bearing pin (3) is radially enclosed on a circumferential section by a wall surface (6) of a trough-shaped receptacle (4) designed as a depression and arranged on an end section (5) of the reversing lever (2), and wherein the bearing pin (3) pivotably receives a connecting element (9) of the traction means (8), characterized in that the receptacle (4) is additionally equipped with an axial contact surface (11) for a traction means (8) that can be fixed to the bearing pin (3), wherein the receptacle (4) is pot-shaped, and wherein the pivot angle of the connecting element (9) is determined by a recess (7) in the wall surface (6).

Description

[0001] The invention relates to a reversing lever for transmitting shifting and / or selection movements, particularly for a manually operable gearshift transmission device of a motor vehicle transmission, which is formed integrally with at least one bearing pin. Furthermore, the invention relates to a gearshift transmission device equipped with such a reversing lever.

[0002] Such a shift transmission device serves to transmit the tilting movements of a bell crank in the direction of the pulling movements of a cable or a linkage to the motor vehicle's transmission. In particular, the selection and / or shifting movements of a manually operated bell crank are transmitted by means of the shift transmission device. The bell crank is usually mounted so that it can rotate about a fixed axis to enable the required tilting movement. Selector lever devices with cable-operated shifts are known in practice for both manual and automatic transmissions.

[0003] A gearshift transmission device of this type for a motor vehicle transmission is known, for example, from DE 10 2006 042 279 A1. It uses at least one relay lever to transmit the required shifting or selection movements to a transmission shift shaft. To produce the relay lever in a space-saving manner and with a reduced number of components while maintaining high component rigidity, the relay lever is connected to at least one bearing journal in one piece and made of the same material.

[0004] EP 0 704 643 B1 discloses a gearshift transmission device for a motor vehicle transmission, which comprises at least one bell crank that transmits shifting and / or selection movements to a transmission shift shaft. The bell crank is a plastic part with a ball joint head that can be coupled to the gearshift lever, as well as two bearing eyes, each of which contains a bearing bush for a vehicle-mounted joint axis and another ball joint head for connection to a secondary connecting rod.

[0005] DE 39 28 593 C2 discloses a gearshift transmission device for a motor vehicle transmission, which has a selector lever for axial adjustment of the transmission selector shaft and a gearshift lever projecting radially at the end of the transmission selector shaft for rotating the selector shaft.

[0006] DE 100 47 841 A1 discloses an articulated lever device for a transmission device of a motor vehicle transmission, comprising an articulated lever and a linkage component that are rotatably connected to one another via a hinge pin and a hinge bushing. The hinge pin has a radially protruding locking element, and the hinge bushing has a disc-shaped locking element with a mounting opening into which the locking element can be engaged during assembly.

[0007] DE 196 25 854 A1 discloses a shift lever unit for transmitting tilting movements of a shift lever into pulling movements of two shift rods. This known shift lever unit comprises a housing unit defining a rotational axis and a frame unit mounted on the housing unit for rotation about this rotational axis.

[0008] From DE 101 24 274 A1 a switching device for a motor vehicle transmission is known with a switching lever which is arranged so as to be pivotable about a bolt relative to a support part.

[0009] Furthermore, DE 195 37 899 A1 discloses a gearshift lever assembly for a manual transmission. Here, too, a reversing lever is pivotably mounted on a lever support by means of a lockable bearing pin.

[0010] Furthermore, DE 42 27 413 A1 relates to a switching device for the mechanical remote operation of a gearbox in a motor vehicle. To transmit the selection and shifting movements of the gearshift lever, two angle levers are mounted in the housing on a common bolt, bearing pin, or the like.

[0011] In practice, the manufacturing effort associated with the previous design of the bell crank in order to be able to reliably transmit the necessary forces and loads occurring during operation has proven to be disadvantageous.

[0012] For example, a conventional bell crank has a fiber content of at least 30 to 45% for stability reasons. To ensure high dimensional stability of the bell crank, PBT is also used as the plastic material, which, especially in combination with the glass fiber reinforcement, can withstand the typical conditions found in the engine compartment over the long term.

[0013] In addition, to increase dimensional stability and component rigidity, it is often necessary to reinforce the side wall of the bell crank with a raised side edge. The side edge, together with the side wall of the bell crank, forms a stable shell structure, with the bearing pins molded onto the outside of the shell or the stiffening elements molded onto the inside of the shell base.

[0014] Against this background, the object of the invention is to design a cable-operated gearshift of the type mentioned above in such a way that its manufacture is significantly simplified. In particular, the design effort is to be reduced.

[0015] This object is achieved with a cable-operated circuit according to the features of patent claim 1. The subclaims relate to particularly expedient developments of the invention.

[0016] According to the invention, the bearing journal is centered in a trough-shaped receptacle designed as a depression and arranged at an end section of the bell crank, and is radially enclosed on a circumferential section by a wall surface of the receptacle, wherein the receptacle is additionally equipped with an axial contact surface for a traction device, for example a cable, that can be fixed to the bearing journal. This easily realizes a strength-optimized form connection of the bearing journal as an integrated and molded-on plastic journal, without the need for complex design aids to achieve the required strength, in particular the flexural rigidity. Rather, the trough-shaped depression of the receptacle results in a highly resilient shape, wherein the articulation point of the traction device on the bearing journal can be easily arranged within a force flow plane of the bell crank.Due to the wall surface of the mount surrounding the bearing journal, the bearing journal is optimally protected from external influences, largely eliminating damage to the bearing journal. For this purpose, the mount can be closed with a cover, for example. Furthermore, the bell crank can be easily manufactured as a single, one-piece plastic part using integrated molding, for example, in a plastic injection molding process. Such bell cranks can be used as a transmission shift lever or as a gear selector lever.

[0017] A particularly advantageous design is also achieved by having the wall surface extend essentially coaxially with the bearing journal. This allows, on the one hand, the annular gap to be limited to the necessary minimum, thus ensuring a highly resilient design, and, on the other hand, largely prevents the influence of external forces, for example, from foreign bodies.

[0018] It has also proven particularly useful if the receptacle has a base surface that supports the bearing pin and the wall surface is provided with an end edge that is essentially arranged in a plane common to an outer surface of the bell crank. This achieves an optimal design in terms of manufacturing technology, as the end edge of the wall surface is also designed as an extension of the surface of the bell crank. Compared to the main extension plane of the bell crank, the bearing pin and the wall surface extend essentially perpendicularly. Of course, a conical shape of the wall surface, at least in sections, is also advantageously feasible. In a simple variant, the receptacle is formed by a recess in the bell crank.

[0019] A further advantageous embodiment of the invention is achieved in that the bearing pin has a rotationally symmetrical cross-sectional shape, at least in sections, and is designed to accommodate a connecting element of the traction device that surrounds it at least in its peripheral section. The rotationally symmetrical section simultaneously forms a bearing section for the connecting element, which for this purpose can be designed, for example, as a bushing, eyelet, or eyelet. With a convex design of the bearing pin in the area of the bearing section, an additional degree of freedom in the sense of a ball joint can be realized if required.

[0020] It is particularly practical if the bearing journal accommodates the traction element in a pivoting manner around the bearing journal's central axis, with the pivot angle of the connecting element being determined by a recess in the wall surface. Limiting the recess to the required size, determined by the pivot angle, allows for a highly resilient design of the trough-shaped or pot-shaped support. The recess is designed as a depression or flattened portion, which can also be reinforced with stiffening material accumulations.

[0021] Furthermore, it proves particularly practical if the bearing journal is designed at least partially as a tubular section, in particular as a slotted tube, in order to achieve high flexural rigidity while simultaneously using minimal material and thus maintaining a low weight. By preferably designing the bearing journal as a slotted tube, a play-free fixation of the traction element to the circumference of the bearing journal is ensured when the bearing journal is compressed against its elastic restoring force for fixation and then rests against the traction element without a gap.

[0022] A further, equally particularly promising modification of the present invention is achieved when the bearing journal has, at its end portion facing away from the base, a securing element integrally connected thereto for axially fixing the traction means or connecting element pivotably mounted on the bearing journal about the latter by means of an elastic locking projection of the securing element. By undercutting the traction means, in particular the connecting element, arranged on the bearing journal, the securing element, for example, designed as a snap-action or locking projection, reliably prevents undesired axial sliding or displacement of the traction means. For fixing, an elastic deformation can preferably be used, in which the securing element does not protrude beyond the undeformed cross-section of the bearing journal.

[0023] Since the bearing pin completely penetrates a through-opening of the connecting element and is thus accessible from the outside for service work, an embodiment is advantageous in which the connecting element is releasably fixed by means of the locking element through the locking projection.

[0024] Furthermore, it is particularly useful if the contact surface is designed so that the connecting element, which is pivotably mounted on the bearing pin, lies in a plane common to the main extension plane of the bell crank, so that torsional forces acting on the bell crank, in particular, can be effectively avoided. While maintaining the same load capacity, a reduced use of plastic material for the bell crank is thus possible, which also allows for a reduction in the dead weight of the bell crank.

[0025] The contact surface can be provided with a friction-reducing surface finish. However, it is also particularly useful if the axial contact surface is designed as a web extending radially between the bearing journal and the wall surface of the support. By forming the contact surface with one or more radial webs or ribs, the contact surface is reduced and thus the frictional forces occurring during operation are reduced. At the same time, a defined contact point is ensured, thus ensuring a precisely reproducible axial position of the traction device on the bearing journal.

[0026] For this purpose, the axial contact surface extends between an area of the wall surface of the support facing away from the bell crank and the bearing journal, thus outside an area of the bell crank subject to increased stress peaks during operation. Rather, the contact surface remains largely unaffected by the tensile forces acting on the traction mechanism.

[0027] The object of the invention is further achieved with a gearshift transmission device for transmitting gearshift or selection movements by means of a bell crank of the gearshift transmission device, which is formed integrally with at least one bearing pin and with a connecting element for a traction means, which is arranged pivotably on the bearing pin and is fixed by a contact surface in a predetermined axial position which corresponds to the main extension plane of the bell crank.

[0028] The invention permits numerous embodiments. To further clarify its basic principle, one of them is shown in the drawing and is described below. This shows in Fig. 1 a plan view of an embodiment of a bell crank according to the invention with a bearing pin and a traction means attached thereto; Fig. 2 an enlarged section of the Fig. 1 sufficient embodiment of the bell crank in a perspective view.

[0029] The embodiment of the deflection lever 2 intended for a particularly manually operable gearshift transmission device 1, in particular for a motor vehicle transmission, for transmitting gearshift or selection movements to a gearshift shaft is described below with reference to the two Fig. 1 and Fig. 2. The reversing lever 2 is formed in one piece with at least one bearing pin 3, which is arranged in a trough-shaped receptacle 4 designed as a depression at an end section 5 of the reversing lever 2. The bearing pin 3 is arranged countersunk in such a way that it is radially enclosed by a wall surface 6 of the receptacle 4, with the exception of a circumferential section determined by the required pivoting movement. For this purpose, the wall surface 6 has a recess 7, which limits the pivot angle of a connecting element 9 fixing a traction means 8 to the bearing pin 3. In order to be able to optimally transmit the forces occurring during operation, the receptacle 4 has a base surface 10 supporting the bearing pin 3, which has a greater material thickness in the region of the recess 7 of the wall surface 6 of the receptacle 4 than in the region of the wall surface 6 facing away from the recess 7.Furthermore, the axial position of the connecting element 9 on the bearing pin 3 is determined such that the connecting element 9 lies in a plane common to the bell crank 2, in that the receptacle 4 is additionally equipped with an axial contact surface 11. This axial contact surface 11 extends radially between the bearing pin 3 and the wall surface 6 of the receptacle 4 as a narrow web in order to reduce the friction occurring during the pivoting movement. In order to prevent undesired detachment of the connecting element 9 from the bearing pin 3, the bearing pin 3 has, on its end section facing away from the base surface 10, a securing element 12 which is connected in one piece with the latter and has an elastically deformable locking projection 13 which, as shown in FIG. Fig. 2, the connecting element 9 is undercut in a form-fitting manner. List of reference symbols 1 switching transmission device 2 bell cranks 3 bearing journals 4 Recording 5 Final section 6 wall surface 7 Recess 8 traction devices 9 Connecting element 10 floor area 11 Contact surface 12 Securing element 13 locking projection

Claims

[1] A deflection lever (2) intended for a particularly manually operable gearshift transmission device (1) for transmitting switching and / or selection movements, which is formed in one piece with at least one bearing pin (3), wherein the bearing pin (3) is radially enclosed in a trough-shaped receptacle (4) designed as a depression and arranged at an end section (5) of the deflection lever (2) by a wall surface (6) of the receptacle (4) on a peripheral section, and wherein the bearing pin (3) pivotably receives a connecting element (9) of the traction means (8), characterized by that the receptacle (4) is additionally equipped with an axial contact surface (11) for a traction means (8) that can be fixed to the bearing pin (3), wherein the receptacle (4) is pot-shaped, and wherein the pivot angle of the connecting element (9) is determined by a recess (7) in the wall surface (6). [2] Deflection lever (2) according to claim 1, characterized bythat the wall surface (6) extends substantially coaxially to the bearing journal (3). [3] Deflection lever (2) according to claims 1 or 2, characterized by that the wall surface (6) has a terminal edge which is arranged essentially in a plane common to a main extension plane or an outer surface of the bell crank (2). [4] Deflection lever (2) according to at least one of the preceding claims, characterized by that the bearing pin (3) has a rotationally symmetrical cross-sectional shape at least in sections and is designed for the arrangement of a connecting element (9) of the traction means (8) which surrounds it at least in circumferential sections. [5] Deflection lever (2) according to at least one of the preceding claims, characterized bythat the receptacle (4) has a base surface (10) supporting the bearing pin (3), which has a greater material thickness in the region of the recess (7) of the wall surface (6) of the receptacle (4) than in the region of the wall surface (6) facing away from the recess (7). [6] Deflection lever (2) according to at least one of the preceding claims, characterized by that the bearing pin (3) is at least partially tubular, in particular partially as a slotted tube, and / or that the bearing pin (3) has, at its end section (5) facing away from the base surface (10), a securing element (12) connected in one piece thereto for axially fixing the traction means (8) or connecting element (9) fixed to the bearing pin (3) so as to be pivotable about the latter. [7] Deflection lever (2) according to at least one of the preceding claims, characterized by that the connecting element (9) is releasably fixed by means of the securing element (12). [8] Deflection lever (2) according to at least one of the preceding claims, characterized by that the contact surface (11) for fixing a connecting element (9) pivotable about the bearing pin (3) is designed in a plane common to the main extension plane of the reversing lever (2). [9] Deflection lever (2) according to at least one of the preceding claims, characterized by that the axial contact surface (11) is designed as a web extending radially between the bearing pin (3) and the wall surface (6) of the receptacle (4) and / or that the axial contact surface extends between a region of the wall surface (6) of the receptacle (4) facing away from the deflection lever (2) and the bearing pin (3). [10] Switch transmission device (1) with a reversing lever (2) according to at least one of the preceding claims, characterized bythat the deflection lever (2) is formed in one piece with at least one bearing pin (3) and that the gearshift transmission device (1) has a connecting element (9) for a traction means (8) which is pivotally arranged on the bearing pin (3) and is fixed by the contact surface (11) in a predetermined axial position in the main extension plane of the deflection lever (2).

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