Lock for a door or hatch on a motor vehicle or building with casing

Abstract

A lock 1 for a motor vehicle door 3, but also for other applications, has a specially designed casing 9 around the recess 10. Furthermore, pointed projections 15, 18 and / or louvers 28, 29 in the casing 9 ensure that dust particles cannot penetrate this area. In this way, creaking noises and other problems are not to be expected, with advantageous noise reduction provided by a casing bead 21 and / or 30 in the contact area 17.

Description

[0001] The invention relates to a lock for a door or flap on a motor vehicle or building with a lock housing with a rotatably mounted rotary latch and a locking bolt to be encompassed by the rotary latch, which in the closed position is partially positively engaged by the rotary latch with its rotary latch jaw, wherein the rotary latch jaw has a local recess in the area of ​​the support arm of the rotary latch.

[0002] Automotive locks, or other locks with latches and rotary bolts, are generally known, with the latches often being wire-shaped and attached to a base plate. In automotive locks, a locking mechanism consisting of a rotary bolt and a pawl is typically used to secure the body-mounted latch. The automotive lock is usually attached to a car door, tailgate, or other movable body part. When such a lock is closed, the rotary bolt's support arm engages with or encompasses the locking bolt, which is typically U-shaped. The rotary bolt pulls the locking bolt into the lock, even against the force of a door seal, and is then itself blocked by the pawl, preventing accidental opening.During the operation of a motor vehicle, vibrations and / or twisting of body components can occur, which may lead to increased stress on the contact area between the rotary latch and the locking bolt. In particular, relative movements between the rotary latch and the locking bolt may occur, potentially resulting in compressive stresses and / or frictional forces. This can lead to creaking, especially when dust particles are present. Such noises and the stresses responsible for them are detrimental. To prevent these creaking noises, DE 10 2008 035 389 A1 proposes that the locking bolt rest against a recess, with the circumferential surface of the rotary latch being locally uncoated in the area of ​​this recess.In this case, a metal-to-metal contact surface is created, ensuring the desired tight seal, even under increased pressure. It is known from EP 1 500 762 A2 to arrange damping elements in the form of projections at the edges of the strike surface between the rotary latch and / or locking pawl for noise reduction. US 4 756 564 A discloses a lock for a motor vehicle door, featuring a rotatably mounted rotary latch with a rotary latch jaw that has a casing with a recess in the area of ​​a load arm of the rotary latch. The recess has a projection, designed as a bead of casing material, which exerts an additional pressing force on a contact area between a locking bolt and the strike plate.

[0003] The invention is based on the objective of improving the interaction of the locking bolt and the rotary latch, and in particular of designing and arranging the contact area in such a way that a high surface pressure is present.

[0004] The invention relates to a lock for a door or hatch on a motor vehicle, comprising a lock housing with a rotatably mounted rotary latch and a locking bolt encompassed by the rotary latch, which, in the closed position, is partially positively engaged by the rotary latch with its rotary latch jaw. The rotary latch jaw has a casing with a local recess in the area of ​​the load arm of the rotary latch. In the area of ​​the recess, the casing has a projection that exerts an additional pressing force on the contact area between the locking bolt and the rotary latch. The recess is designed and arranged to allow metal-to-metal contact between the locking bolt and the rotary latch. The projection is formed as a bead of casing material that divides a contact area. According to the invention, the rotary latch has a pointed projection below the casing in the area of ​​the recess.Due to this predetermined, relatively large overhang of the casing, an even higher pressing force is exerted on this connection after the locking bolt is engaged with the rotary latch. This ensures that, at least in this area, dust particles and similar contaminants cannot penetrate due to the increased pressing force, thus maintaining the desired and necessary metal-to-metal contact between the locking bolt and the rotary latch without the risk of adverse creaking noises or similar issues.

[0005] According to the design specifications, the casing is intended to protrude around the recess on the support arm. This is meant to indicate that the protrusion specifically covers the entire area of ​​the metal-to-metal contact and ensures that no adverse noises can occur. The protrusion results in the aforementioned higher forces because the casing, which is made of a suitable plastic, must deform accordingly when the locking bolt and rotary latch come together.

[0006] Regarding the height of such a protrusion, the invention provides that it should be between 0.01 mm and 2 mm, preferably between 0.05 mm and 1 mm. Such a protrusion, especially if it is present all around and stands almost vertically, leads to the described higher compression and pressing forces, so that even during driving, fine dust particles will not enter this area.

[0007] As mentioned earlier, the locking bolt and rotary latch are to have metal-to-metal contact in the area of ​​the recess. The invention specifically stipulates that the recess(s) must be designed and arranged to allow metal-to-metal contact between the locking bolt and rotary latch, and this contact may also occur at the edges. The necessary contact can be precisely positioned by appropriately shaping and dimensioning the recess as required for the specific application.

[0008] According to the present invention, the casing is designed to project beyond the recess, and furthermore, lateral parts of the casing in the recess area are designed to act as damping elements, forming a bead-like structure. This damping function can be achieved through the thickness, shape, or choice of material, so that damaging impacts are absorbed when the locking bolt is inserted into the rotary latch jaw.

[0009] To further increase the clamping forces, or more precisely, the surface pressure, the invention provides that the rotary latch has a pointed projection below the casing in the area of ​​the recess, thus creating a linear zone of higher stress that prevents harmful dust from penetrating this area. The pointed projection itself is rounded in the contact area with the casing and the locking bolt, so that damage to the casing cannot occur.

[0010] To ensure uniform loading across the entire system area, the invention provides that the attachment is covered only by a thin-walled section of the casing, while the remaining area is fully enclosed. The thickness of this section allows for adjustment of the additional pressure applied.

[0011] To prevent dust from penetrating on both sides of the contact area, the invention provides for a rotary latch projection on both sides of the contact area of ​​the support arm and locking bolt. This means that a projection of the same height and with the same covering by the remaining casing is implemented on both sides of the contact area, in order to reliably prevent the ingress of dust, especially into the metal-to-metal contact area.

[0012] According to a further advantageous embodiment of the invention, the targeted metal-on-metal contact can be further and uniformly achieved by providing a partial recess in the casing in the area of ​​the projections or around the rotary latch jaw. This recess features a casing bead that projects beyond the edge of the support arm. This casing bead thus protrudes beyond the metal edge or surface of the support arm and ensures noise reduction when the locking bolt is inserted, because the casing bead must first bear the load before the metal-on-metal contact occurs. This protruding plastic bead or casing bead prevents the so-called "ticking noise" when closing a lock.It is sufficient if the protective bead protrudes only slightly beyond the edge of the support arm, since it is only intended to cushion the initial impact or the initial contact between the support arm and the locking bolt. The deformation of this protrusion should be achieved with relatively little effort, so that the desired metal-on-metal contact is then present.

[0013] According to the invention, this slight overhang is selected such that the casing bead projects by 0.1 mm to 0.2 mm, preferably 0.1 mm + 0.05 mm. Even with such a small overhang, the desired cushioning is ensured and unwanted noises are reduced or completely prevented.

[0014] In a further advantageous embodiment, the casing of the rotary latch is equipped with lamellae designed to remove any dirt particles that may have entered the operating area. These lamellae are integrated into the casing so that they first capture any intruding dust particles and then remove them, thus preventing the adverse creaking noises. The inclusion of these lamellae therefore has two effects: firstly, the capture and temporary or final storage of the dirt particles, preventing them from causing damage, and secondly, the prevention of adverse impact noises.

[0015] It has been shown that it is advantageous for the slats to be designed radially to the axis of rotation or slightly inclined towards the contact area. This means that any dirt particles that may have penetrated collect in the slats or in the lowest part of the slats and can then be slowly transported further and disposed of.

[0016] It was mentioned earlier that the pressure-secured application of the casing in the area of ​​the locking bolt can be supported by providing a pointed projection or similar feature on the steel part in this area. The casing is also thinner in this section. The further development described above specifically addresses this by proposing that the lamellae overlap the area with the pointed projection. This hinders or completely prevents the effectiveness of dirt particles precisely where the peak pressure is generated, thus providing additional security for the contact area.

[0017] The described lamellae are not only intended for the actual perimeter of the installation area, but a bead of cladding material with lamellae is also provided to divide or define the installation area. This further supports the tight seal of the installation area, resulting in the effects already described several times above.

[0018] The invention is characterized in particular by the creation of a lock that can be advantageously used especially in motor vehicles and that is designed in such a way that the necessary forces between the rotary latch and the locking bolt are reliably transmitted, while simultaneously preventing harmful dust from penetrating the contact area. The special arrangement and design of the casing in the area of ​​the known recess ensures the necessary metal-to-metal contact and simultaneously designs the area around the recess to provide noise insulation. Finally, additional projections are provided on the support arm and the rotary latch, primarily serving to protect the contact area from dust ingress. This ensures that no creaking noises can occur with this lock.Any dust that may have penetrated is also rendered harmless by the fact that lamellae are incorporated into the casing, especially at the edge of the system area, which preferably run radially to the axis of rotation.

[0019] Further details and advantages of the invention will become apparent from the following description of the accompanying drawing, in which a preferred embodiment is shown with the necessary details and components. The drawing shows: Fig. 1. A simplified view of a lock with a locking mechanism, Fig. 2 the core of the rotary trap, i.e. the corresponding steel part in perspective rendering, Fig. 3 a perspective rendering of the rotary trap with edge overhang, Fig. 4 the same view of a rotary trap, here with a casing ridge in the installation area, Fig. 5 a section through the support arm with the in Fig. 4 shown overhang, Fig. 6 a perspective rendering of a rotary trap with lamellae in the casing and Fig. 7 the enlarged representation of the rotary trap mouth of a rotary trap with the in Fig. 6 slats shown.

[0020] Fig. Figure 1 shows the lock 1 with its lock housing 2, which is integrated into a vehicle door 3 in such a way that the locking mechanism 4 can function optimally to securely lock the locking bolt 6. This locking is achieved by the rotary latch 5, which, after reaching the closed position, pivots around the locking bolt 6 to effectively secure the vehicle door 3 to the chassis. After reaching the final position, the locking pawl 7 of the locking mechanism 4 ensures that the rotary latch 5 is not unintentionally pivoted out of its closed position. The rotary latch jaw 8, which receives the locking bolt 6, has a covering 9 made of a plastic that possesses the necessary hardness and sufficient flexibility. The rotary latch 6 is moved into the closed position around the rotary latch axis 19 (see Figure 1). Fig. 1) and swung into the open position.

[0021] Fig. Figure 2 shows the actual core of a rotary latch 5, the so-called steel part 26. This steel part 26 is used in Fig. 3 of the casing 9 completely or almost completely enveloped, whereby one can see in Fig. 2 clearly shows a pointed approach 15, which is subsequently also specifically noticeable in the encasing 9 in order to seal the plant area 17 as tightly as possible against the environment.

[0022] Fig. Figure 3 shows a rotary latch 5 in perspective view, where the initial pointed projection 15 and the second projection 18 are indicated in the contact area 17. These projections 15 and 18 are provided with a thin-walled section of the casing 9, with the recess 10 in the casing 9 clearly visible. This ensures that the steel of the rotary latch 5 comes into contact with the steel of the locking bolt 6. The projection 12 is marked as a kind of bead, which ensures a particularly effective seal of the contact area 17. The projection 12 should ideally be provided on both sides of the contact area 17, with the second projection 18 only indicated.

[0023] The inlet area of ​​the rotary trap 5 is designated by 32, which is actually referred to as rotary trap mouth 8, but is given a separate reference sign here because, according to a variant shown further back, lamellae are inserted into this inlet area.

[0024] The steel part 26 protrudes from the casing 9 at several points, but especially in the planting area 17.

[0025] Fig. At first glance, the illustration shows 4. Fig. 3 very similar. However, here the installation area 17 is reduced in some respects because a sheathing bead 21 is formed or a protruding rubber surface 24. This is clearly evident. Fig. 5 stands out. However, even in Fig. 4. It can be seen that the recess 10 is formed continuously from the upper edge to the lower edge, while after Fig. 5. This recess 10 is interrupted, which is indicated by the different coloring. The dark area is the protruding rubber surface 24.

[0026] As already mentioned, the Fig. 5. The special design mentioned earlier, according to which a recess 20 is created in the steel part 26 of the support arm 11 to provide a distinct encasing bead 21. This encasing bead 21 projects beyond the edge of the support arm 22 with its metal surface 23, so that when the locking bolt 6 strikes the rotary latch 5, this encasing bead 21 initially provides damping. Only when the corresponding contact force is applied does the metal locking bolt 6 come into contact with the metal surface 23, and the desired prevention of creaking noises is achieved. At the same time, the rubber surface 24, or rather the encasing bead 21, provides advantageous noise damping when closing the vehicle door 3, because before contact between the rotary latch 5 and the locking bolt 6, this protruding area of ​​the encasing bead 21, or rather the encasing bead 21, first comes into contact.The protruding rubber surface 24 must be deformed in such a way that metal-to-metal contact occurs. This solution thus fulfills two requirements simultaneously, as it achieves both noise reduction and secure contact between the rotary latch 5 and the locking bolt 6. Since the thickness 25 of the protruding rubber surface 24 is important for noise reduction, it is indicated by a separate reference numeral 25.

[0027] Fig. 6 and Fig. Figure 7 finally shows a particular embodiment in which lamellae 28, 29 are provided in the casing. The lamellae 28, 29 extend approximately radially to the axis of rotation 19, preferably as shown in Fig. 7. The edges are noticeably slightly inclined. This is evident because protrusions 33, 34 are visible at both the lower and upper edges. Any dust or dust particles that may have penetrated the grooves 35 between the lamellae 28, 29 can collect, thus rendering them ineffective in causing creaking noises. Due to the corresponding inclination, any dirt particles also migrate outwards and can therefore no longer have a detrimental effect.

[0028] The contact area marked 17 is identifiable, where the metal surfaces 23, 23' come into contact with the metal surface of the locking bolt 8. This contact area 17 is used in the Fig. 6 and Fig.In the embodiment shown in Figure 7, the area is subdivided by a bead 30, which also has lamellae 31 and thus contributes to the temporary storage or neutralization of dust particles. The bead itself, as well as the lamellae 28, 29 in the inlet area 32, ensure that increased pressure is generated here, which contributes to the desired sealing of this area.

[0029] All the features mentioned, including those that can be seen from the drawings alone, are considered essential to the invention, both individually and in combination.

Claims

[1] Lock for a door or flap on a motor vehicle with a lock housing (2) with a rotatably mounted rotary latch (5) and a locking bolt (6) to be encompassed by the rotary latch (5), which in the closed position is partially positively engaged by the rotary latch (5) with its rotary latch jaw (8), wherein the rotary latch jaw (8) has a casing (9) with a local recess (10) in the area of ​​the load arm (11) of the rotary latch (5), wherein the casing (9) has a projection (12) in the area of ​​the recess (10) exerting an additional pressing force on the contact area locking bolt (6) / rotary latch (5), wherein the recess (10) is designed and arranged to allow metal-to-metal contact between the locking bolt (6) and the rotary latch (5), wherein the projection (12) is designed as a bead of casing material dividing a contact area (17), characterized by, that the rotary trap (5) has a pointed projection (15, 18) below the casing (9) in the area of ​​the recess (10). [2] Lock according to claim 1, characterized by , that the sheathing (9) is designed to protrude around the recess (10) on the load arm (11). [3] Lock according to claim 2, characterized by , that the overhang (12) is formed to be 0.01 mm to 2 mm, preferably 0.05 to 1 mm. [4] Lock according to any of the preceding claims, characterized by , that lateral parts of the sheathing (9) in the area of ​​the recess (10) are also formed in a bead-like manner to perform damping functions. [5] Lock according to any of the preceding claims , characterized by , that the approach (15, 18) is only covered by a thin-walled section of the casing (9). [6] Lock according to claim 4, characterized by, that such a projection (15, 18) of the rotary latch (5) is provided on both sides of the installation area (17) of the load arm (11) and locking bolt (6). [7] Lock according to any of the preceding claims, characterized by , that in the inlet area (32) of the rotary trap (5) in the casing (9) lamellae (28, 29) are provided which are designed to remove any dirt particles that may have entered the system area (17). [8] Lock according to claim 7, characterized by that the lamellae (28, 29) are arranged radially to a rotation axis (14) or slightly inclined towards the contact area (17). [9] Lock according to claim 8, characterized by , that the lamellae (28, 29) are formed to cover the area with the pointed base (15). [10] Lock according to claim 9, characterized by , that a bead (30) dividing the plant area (17) is provided, made of sheathing material with lamellae (31).

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