JPH0216437B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a fork latch and a locking pawl that are attached to an automobile door and actuated by a closing pin attached to the door frame, and the fork latch has a preliminary locking arm and a main locking arm, and the locking pawl has a lever arm and a hook attached to the lever arm, and when closing the automobile door, the hook of the locking pawl is first set to the preliminary locking arm. engaging the pre-locking arm in the locked position and then the primary locking arm in the fully locked position, the fork latch and the locking pawl being offset in the direction of the locking movement of the fork latch; The present invention relates to an automobile door lock having a rotary shaft.

In this type of automobile door lock, during the locking movement, the pre-locking arm moves the locking pawl first, then the main locking arm moves the locking pawl, and the locking pawl is not moved directly by the locking pawl lever arm, but directly by the locking hook. move. The contact surface of the prelock arm abuts the appropriate contact surface of the hook during the locking movement, and the hook slides on the prelock arm and then fully engages the prelock arm. As a result, the hook is subjected to two impact shocks, first by the pre-locking arm and then by the main locking arm. The parts used in automobile door locks are usually made of materials of such properties and strength that they do not undergo premature failure due to these collision impacts. However, the impact of the collision between the main locking arm and the hook still impairs the functional reliability of the lock. If the vehicle door is closed very roughly and bounces back, the hook may not fully engage the main locking arm. In fact, the collision causes a very rapid acceleration of the locking pawl,
This locking pawl rebounds by a corresponding distance under the action of the biasing spring. In such cases, early damage is likely to occur.

The object of the invention is to improve a motor vehicle door lock of the type mentioned at the outset, in such a way that impact impacts no longer occur between the hook and the main locking arm.

In order to solve this problem, the present invention proposes the following. In other words, the shape of the fork latch and the locking pawl is such that when the fork latch rotates and moves from the pre-locking position to the fully locking position, the pre-locking arm contacts the locking pawl lever arm and this lever arm is rotated. The shape is such that when pushed and moved, the hook is guided and brought into contact with the main locking arm.

Preferably, the parts are formed and assembled such that the pre-locking arm guides the hook onto the primary locking arm, and the hook is activated when, for example, the fork latch has completed its rotation in the locking direction. Preferably, it is adapted to fully engage the primary locking arm under the action of the biasing spring. However, it is also possible to adopt an arrangement in which the preliminary locking arm automatically pushes the hook into the back of the main locking arm, viewed in the direction of the locking movement. The two methods can also be combined, whereby the pre-locking arm moves the locking pawl lever arm until the primary locking arm fully engages the hook. Preferably, the axis of rotation of the locking pawl is arranged above the axis of rotation of the fork latch, and further forward of the axis of rotation of the fork latch when viewed in the direction of locking movement of the fork latch.

An advantage of the invention is that substantially no impact shocks occur between the hook and the main locking arm. Even if the vehicle door is violently slammed shut with excessive force, the said back of the main locking arm on the fork latch ensures engagement with the hook.

Embodiments of the present invention will be described with reference to the following drawings.

The illustrated motor vehicle door lock has a fork latch 1 and a locking pawl 2 as important elements within the scope of the invention. The fork latch 1 has a pre-locking arm 3 and a main locking arm 4. The locking pawl 2 has a locking pawl lever arm 5 and a hook 6 attached to this arm. When closing a motor vehicle door, the pre-lock arm 3 first engages the hook 6 in the pre-lock position shown in FIG. The main locking arm 4 then engages the hook 6 of the locking pawl 2 in the fully locked position. This is shown in FIG. The actuation of the fork latch 1 takes place via a closing pin 7, which can be seen by comparing FIGS. 1 to 3.
A motor vehicle door lock is generally integrated into the motor vehicle door 8, while the closing pin 7 is located in the corresponding door pillar or door frame. Other arrows drawn in the figure indicate the direction of movement.

In particular, as is clear from FIG. 2, the pre-locking arm 3 is in contact with the locking pawl lever arm 5 in such a way as to move the fork latch 1 midway through its path from the pre-locking position to the full locking position. Also, the locking hook 6 is brought into contact with the main locking arm 4, thereby preventing a collision impact between the hook 6 and the main locking arm 4. Various transition positions following the sequence of FIGS. 2a, b, c are indicated by various lines. Second
In the figure, the preliminary locking arm 3 is designed to place the hook 6 on the main locking arm 4, but it may also be in contact with the above-mentioned back part of the main locking arm 4. In addition, FIG. 2 shows that the pre-locking arm can move the locking pawl lever arm 5 and the main locking arm 4 can move the hook 6.

Additional features of the illustrated embodiment include the following. That is, fork latch 1 and locking pawl 2
has rotational axes 9, 10 arranged offset in the direction of the locking movement of the fork latch 1. The axis of rotation 9 for the locking pawl 2 is arranged above the axis of rotation for the fork latch 1 and further forward than the axis of rotation of the fork latch, viewed in the direction of locking movement of the fork latch. There is.

[Brief explanation of drawings]

FIG. 1 is a side view in cross section of an automobile door lock according to the invention, FIG. 2 is a view showing the object of FIG. 1 in another operating position, and FIG. 3 is a view of the object of FIG. FIG. 6 is a diagram shown in another operating position; 1...Fork latch, 2...Latching pawl, 3...
...Preliminary locking arm, 4...Main locking arm, 5...
Locking pawl lever arm, 6... hook, 7... closing pin.

Claims (1)

[Claims] 1. A fork latch and a locking pawl that are attached to an automobile door lock and operated by a closing pin attached to a door frame, and the fork latch has a pre-locking function. The locking pawl has a locking pawl lever arm and a hook provided on the lever arm, and when closing the automobile door, the hook of the locking pawl first engages in the preliminary locking state. engaging the pre-locking arm in the locked position and then the primary locking arm in the fully locked position, the fork latch and the locking pawl being offset in the direction of the locking movement of the fork latch. It has a rotating shaft and the shape of the fork latch and the locking pawl is such that the pre-locking arm contacts the locking pawl lever arm in a path where the fork latch rotates from the pre-locking position to the full-locking position. A door lock for an automobile, characterized in that the lever arm of the lever is pushed and moved to guide the hook into contact with the main locking arm. 2. The automobile door according to claim 1, characterized in that when the fork latch is fully rotated in the locking direction, the hook completely engages with the main locking arm by the action of a biasing spring. Tablet. 3. A door lock for a motor vehicle according to claim 1, characterized in that the preliminary locking arm acts to push the hook into the back of the main locking arm when viewed in the direction of its locking movement. 4. The automobile door lock according to claim 2 or 3, wherein the preliminary locking arm pushes the locking pawl lever arm until the main locking arm comes into contact with the hook. 5 The rotation axis of the locking pawl is arranged above the rotation axis of the fork latch, and furthermore, it is arranged in front of the rotation axis of the fork latch when viewed in the locking movement direction of the fork latch. Any one of claims 1 to 4
Automobile door locks.