JPS6332668B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a trunk lid opening/closing device provided at the rear of a passenger vehicle.

Conventional trunk lid opening/closing devices generally have a
It was constructed as shown in the figure and FIG. That is, a trunk hinge 2 fixed to the lower surface of the trunk lid 1 is rotatably attached to a hinge bracket 3 fixed to the vehicle body side about a hinge center 4, and is fixed at an intermediate position of the trunk hinge 2. One end of the torsion bar 6, which is disposed parallel to the trunk lid, is twisted into the groove 5a of the link 5 to apply a biasing force to the trunk lid 1 in the counterclockwise direction, that is, in the opening direction. I am learning to give.

However, in the above conventional trunk lid opening/closing device, the weight of the link 5 fixed to the trunk hinge 2 acts as a moment to rotate the trunk lid in the closing direction, so the torsion bar 6
In addition to being easy to break, the torque of the torsion bar 6 acts in a direction that presses the link 5, so the link 5 is easily deformed, and once deformed, the torque of the torsion bar 6 acts to increase the deformation. . Furthermore, in the case of conventional equipment, the torque characteristic of the torsion bar tends to be as shown by the chain line B in contrast to the trunk lid's self-weight moment characteristic shown by the broken line A in FIG. Even if the moment is set higher than the trunk lid's own weight moment,
When the torque decreases due to aging of the torsion bar, it becomes lower than the lid's own weight moment in a certain angular range as shown by the chain line C, and there is a drawback that the lid lowers at that position.

This invention was made in view of the above-mentioned problems. For example, the trunk hinge is formed in such a shape that the hinge center part makes a U-turn and approaches the lid fixed side, and the One end of the link is rotatably attached to the position where it descends when the trunk hinge is rotated in the opening direction of the trunk lid, and one end of the torsion bar is engaged with the other end of this link, so that the torque of the torsion bar pulls the link. By configuring the trunk lid to be biased in the opening direction by acting in the tensioning direction, the link becomes difficult to deform, reducing the rigidity of the link, and the weight of the link is transferred in the opening direction of the lid. The object of the present invention is to provide a trunk lid opening/closing device which prevents the torsion bar from becoming fatigued due to the effect on the torsion bar, and also prevents the lid from lowering due to aging of the torsion bar, since the torque characteristics of the torsion bar approach the own weight moment characteristics of the lid. do.

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. In the figure, 1 is a trunk lid, and 2 is a trunk hinge, which is fixed to the lower surface of the trunk lid 1 at the rear with bolts 7, 7. The front part of the trunk hinge 2 is curved downward, and the tip is shaped like a U-turn to approach the lid fixing part, and a hinge pin 4 is inserted through the tip to attach it to the bracket 3. It is rotatably mounted. This bracket 3 is fixed to the vehicle body side and supports the trunk hinge 2. Next, 5 is a link rotatably attached to a portion of the trunk hinge 2 that is further away from the lid 1 than the hinge pin (hinge center) 4 by a connecting pin 8, and 6 is a link that is approximately parallel to the trunk lid 1. This torsion bar 6 has an arm portion 6a bent at a substantially right angle at one end, and the tip of this arm portion 6a twists the torsion bar in advance. When the groove 5 at the tip of the link 5 is inserted
a from the front, and the torsion bar 6 constantly urges the trunk hinge 2, that is, the trunk lid 1, in the counterclockwise direction (opening direction) by its restoring torque. The other end of the torsion bar 6 is locked to a locking member 10 fixed to the lower surface of the parcel shelf. Reference numeral 11 denotes a clip that maintains the distance from the other torsion bar 6'.

According to the above configuration, in the trunk lid closed state shown in FIG. 4, the restoring torque of the torsion bar 6 acts counterclockwise on the tip of the link 5, so the link 5 is pulled in the direction of the arrow A. Become. Therefore, trunk hinge 2 has link 5.
A moment about the hinge center 4 acts through the coupling pin 8 at the tip, and this moment always urges the trunk lid 1 in the open direction.

As explained above, in the trunk lid opening/closing device according to the present invention, the trunk hinge is curved downward, and the tip through which the hinge pin is inserted is formed in a U-turn to approach the trunk lid. One end of the link is rotatably attached to the position where it descends when the hinge is rotated in the trunk lid opening direction, and one end of the torsion bar is engaged with the other end of this link, so that the torque of the torsion bar always moves the link above. Since it is configured to act in the pulling direction, only tensile stress acts on the link, making it difficult for the link to deform, reducing the rigidity of the link, and allowing the link's own weight to act in the opening direction of the lid. The torsion bar is less likely to wear out. Furthermore,
In the device of the present invention, the torque characteristic of the torsion bar approximates the dead weight moment characteristic of the lid (broken line A), as shown by the solid line D in FIG. Since the moment of the lid's own weight is not lower than that of the lid, it is possible to prevent the lid from lowering.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing an example of a conventional trunk lid opening/closing device, Fig. 2 is a perspective view thereof, Fig. 3 is a graph showing the torque characteristics of a torsion bar with respect to the opening angle of the trunk lid, and Fig. 4 is a diagram showing an example of a conventional trunk lid opening/closing device. FIG. 5 is a schematic side view showing an example of a trunk lid opening/closing device, and FIG. 5 is a perspective view thereof. 1... Trunk lid, 2... Trunk hinge, 4... Hinge center (hinge pin), 5...
Link, 5a...Groove, 6...Torsion bar.

Claims (1)

[Claims] 1. In a trunk lid opening/closing device configured to always bias a trunk lid, which is rotatably attached to a vehicle body by a trunk hinge, in the opening direction by applying torque of a torsion bar to the trunk hinge, the trunk hinge is rotated downwardly. It is curved, and the tip portion through which the hinge pin is inserted is formed in a U-turn to approach the trunk lid, and is located on the trunk hinge at a position where it descends when the trunk hinge rotates in the opening direction of the trunk lid. , one end of the link is rotatably attached, one end of the torsion bar is engaged with the other end of the link, and the torque of the torsion bar acts in a direction that constantly pulls the link, urging the trunk lid in the opening direction. A trunk lid opening/closing device characterized in that it is configured to.