JP4286525B2 - Trunk lid opening and closing mechanism - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a trunk lid opening / closing mechanism for closing an opening of a trunk room provided in an automobile.
[0002]
[Prior art]
Conventionally, an arm that is provided between the vehicle body and the trunk lid so that the trunk lid can be easily opened, and supports the track lid so as to be opened and closed, and a spring that urges the trunk lid to rotate in the opening direction. An opening / closing mechanism provided with is known. An opening / closing mechanism using a gas spring instead of the spring is also known.
[0003]
In an open / close mechanism using a spring, it is necessary to adjust the balance between the biasing force of the spring and the torque in the closing direction due to the weight of the trunk lid so that the operability of the trunk lid is not impaired. The trunk lid is set small so as not to pivot vigorously in the opening direction. For this reason, there was a tendency that the trunk lid was not stably held at or near the fully open position and swayed.
[0004]
In order to solve such a problem, an open / close mechanism has been proposed in which a friction brake mechanism capable of holding the trunk lid in an arbitrary rotational position is interposed between the vehicle body and the trunk lid (see, for example, Patent Document 1 below). ). According to this opening / closing mechanism, the friction brake mechanism can hold the trunk lid at an arbitrary rotational position against the combined torque of the biasing force of the spring acting on the trunk lid and the closing direction torque due to the trunk lid's own weight. Therefore, it is possible to eliminate the wobbling of the trunk lid.
[0005]
However, this opening / closing mechanism has a structure in which friction material is always pressed against the arm that supports the trunk lid, and the trunk lid is prevented from wobbling due to the frictional resistance. Therefore, when the trunk lid is opened / closed, the trunk lid is always attached. However, it is necessary to open and close with considerable force, and the burden on the operator is large. In addition, manufacturing errors and assembly errors of the arm and friction material are directly linked to hindering the smooth rotation of the trunk lid, so that high precision control is required.
[0006]
On the other hand, the opening / closing mechanism using the gas spring can stably hold the trunk lid in the fully open position. However, gas springs are generally expensive and have a problem of high manufacturing costs. In addition, since the gas spring has the property that the force to open the trunk lid increases as the temperature rises, the magnitude of the force applied when closing the trunk lid changes in summer and winter, especially in the hot summer season There is a disadvantage that considerable force is required when closing the trunk lid. Furthermore, when used for a long period of time, the gas escapes and the opening force decreases, and it may be difficult to completely open the trunk lid.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-1948
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and provides a trunk lid opening / closing mechanism capable of improving operability as compared with the conventional one and stably holding the trunk lid in the fully open position. Let it be an issue.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention according to claim 1 is a trunk lid opening / closing mechanism for closing an opening of a trunk room provided in an automobile, and is provided between a vehicle body and a trunk lid. An arm that supports the lid so as to be openable and closable, a spring that urges rotation of the arm in the opening direction, and a hydraulic damper that decelerates the rotational speed of the arm in the opening direction against the urging force of the spring And the spring in a rotation angle range from the fully closed position to the vicinity of the fully closed position and a rotation angle range from the vicinity of the fully open position to the fully open position. Is larger than the load moment due to the trunk lid's own weight and smaller than the load moment due to the trunk lid's own weight in the rotation angle range from near the fully closed position to near the fully open position. Providing the opening and closing mechanism, characterized in that it is intended to exert a biasing force.
According to a second aspect of the present invention, in the opening / closing mechanism according to the first aspect, the hydraulic damper is unidirectional to reduce only the rotational speed of the arm in the opening direction. provide.
According to a third aspect of the present invention, the hydraulic damper divides a space filled with oil into two chambers, and swings with the rotation of the arm to press the oil, and at least the A groove formed so that oil pressed by the vane can pass when moving between the chambers in a swing range of the vane from the fully closed position to the vicinity of the fully open position. The opening / closing mechanism according to claim 1, comprising a rotating damper.
The present invention described in claim 4 is characterized in that the groove is formed so that the pressure of oil gradually increases as the vane swings in one direction. An opening / closing mechanism is provided.
According to a fifth aspect of the present invention, the rotary damper causes the oil to pass through the partition wall or the vane that partitions the space filled with oil and the oil that passes through the passage in only one direction. The opening / closing mechanism according to claim 3 or 4, wherein a valve mechanism including a check valve is provided.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
FIG. 1 to FIG. 3 are views showing the main part of an opening / closing mechanism according to one embodiment of the present invention. FIG. 1 is a plan view, FIG. 2 is a left side view, and FIG. As shown in these drawings, the opening / closing mechanism according to this embodiment includes an arm 10, a spring 20, and a hydraulic damper 30.
[0011]
The arm 10 is provided between the vehicle body 60 and the trunk lid 70 of the automobile, and functions to support the track lid 70 so as to be openable and closable (see FIG. 5). In the arm 10 according to the present embodiment, the base end portion 10 a is supported by a support shaft 50 that is rotatably supported by a bracket 40 that is fixed to a vehicle body 60 of an automobile, and the distal end portion 10 b is fixed to a trunk lid 70. Thus, it is provided between the vehicle body 60 and the trunk lid 70 (see FIGS. 1 and 5). The trunk lid 70 is connected to the vehicle body 60 through the arm 10 and is supported by the arm 10 so as to be opened and closed. The arm 10 is engaged with a support shaft 50 that supports the base end portion 10a. When the arm 10 is rotated, the support shaft 50 is rotated accordingly.
[0012]
The spring 20 functions to urge rotation of the arm 10 in the opening direction. As the spring 20, a torsion bar that is also employed in a conventionally known opening / closing mechanism can be used. The spring 20 in the present embodiment is a coil spring, and is arranged so that the cylindrical coil portion 20 c surrounds one end portion 50 a side of the support shaft 50, and one end 20 a is one end portion 50 a of the support shaft 50. The other end 20b is fixed to the bracket 40 (see FIGS. 1 and 2). The spring 20 is provided so as to store a force that is twisted by the rotation of the support shaft 50 as the arm 10 rotates in the closing direction, and thereby urges the arm 10 to rotate in the opening direction.
[0013]
FIG. 6 shows the rotational position of the trunk lid 70, the biasing force (T) of the spring 20 acting on the trunk lid 70, and the combined torque of the biasing force (T) of the spring 20 and the load moment (M) of the trunk lid 70. It is a graph which shows the relationship with (TM). As shown in this graph, as the spring 20, the rotation angle range from the fully closed position O to the fully closed position P and the fully open position Q to the fully open position R is set as the arm 10 that rotates in the opening direction. Is larger than the load moment (M) due to the dead weight of the trunk lid 70, and in the rotational angle range from the fully closed position vicinity P to the fully open position vicinity Q, the trunk lid 70 It is preferable that the urging force (T) is smaller than the load moment (M) due to its own weight.
[0014]
In other words, in the rotation angle range from the fully closed position O to the fully closed position P, the biasing force (T) of the spring 20 causes the load moment (M Is greater than), the resultant torque (TM) becomes a positive value. Therefore, no external force is applied to the trunk lid 70 until the trunk lid 70 reaches the fully closed position P from the fully closed position O. However, the trunk lid 70 can be automatically opened.
[0015]
Further, in the rotation angle range from the vicinity of the fully open position Q to the fully open position R of the arm 10 that rotates in the opening direction, the biasing force (T) of the spring 20 is based on the load moment (M) due to the dead weight of the trunk lid 70. Is larger, the resultant torque (TM) becomes a positive value, so that an external force is applied to the trunk lid 70 until the trunk lid 70 reaches from the fully open position Q to the fully open position R as described above. Without it, the trunk lid 70 can be automatically opened. Further, since the urging force (T) of the spring 20 acts strongly on the trunk lid 70 until the trunk lid 70 reaches the fully open position R from the vicinity Q of the fully open position, the trunk lid 70 is stably held at the fully open position R. It becomes possible to hold.
[0016]
On the other hand, the urging force (T) of the spring 20 is applied to the load moment (M) by the dead weight of the trunk lid 70 in the rotation angle range from the vicinity of the fully closed position P to the vicinity of the fully open position Q. ), The combined torque (TM) becomes a negative value. Therefore, the trunk lid 70 is put in hand until the trunk lid 70 reaches from the fully closed position vicinity P to the fully open position vicinity Q. Although it is necessary to open the trunk lid 70, it is possible to automatically rotate the trunk lid 70 in the closing direction by releasing the hand from the trunk lid 70.
[0017]
Refer to FIG. 5 for the pivot position of the trunk lid 70 (arm 10).
[0018]
The hydraulic damper 30 functions to decelerate the rotational speed in the opening direction of the arm 10 against the urging force of the spring 20. Advantages of adopting a hydraulic damper as a damper include that a large braking force can be exerted and that a stable braking characteristic can be obtained over a long period of time. The hydraulic damper 30 in this embodiment includes a rotor 32 provided in a casing 31, a partition wall 33 that partitions a space formed between the rotor 32 and the casing 31, and a space partitioned by the partition wall 33. And a vane 34 that divides the space filled with the oil into two chambers 39a and 39b (see FIG. 4). The rotary damper configured in this manner can exhibit a large braking force even if it is small, and therefore requires a small installation space, and is suitable as the hydraulic damper 30.
[0019]
Here, the rotor 32 has a hollow portion 32a having a quadrangular cross section penetrating along the axis thereof, and the other end portion 50b side of the support shaft 50 is inserted into and engaged with the hollow portion 32a. It rotates in the casing 31 with 50 rotations (see FIGS. 1 and 4). The vane 34 projects from the outer peripheral surface of the rotor 32 toward the inner peripheral surface of the casing 31, and is formed integrally with the rotor 32 so that the tip end surface 34 a is in sliding contact with the inner peripheral surface of the casing 31. In the filled space, it swings with the rotation of the rotor 32 and presses the oil.
[0020]
The hydraulic damper 30 is preferably a one-way one that reduces only the rotational speed of the arm 10 in the opening direction. According to the unidirectional hydraulic damper 30, when the arm 10 rotates in the closing direction, the braking force of the hydraulic damper 30 does not act on the arm 10, so that the trunk lid 70 can be closed with a small force. Therefore, operability can be improved.
[0021]
For this reason, the rotary damper employed as the hydraulic damper 30 is provided with a unidirectional valve mechanism that exerts a braking force only when the vane 34 swings in one direction. preferable.
[0022]
The rotary damper as the hydraulic damper 30 in the present embodiment is a unidirectional valve mechanism that includes a passage 35 that penetrates the vane 34 in the circumferential direction and allows oil to pass therethrough, and an oil that passes through the passage 35. A configuration including a check valve 36 that flows only in the direction is employed (see FIG. 4). Here, the passage 35 has a large hole portion 35a that opens in one of the two chambers 39a and 39b (hereinafter referred to as “pressure chamber”) 39a defined by the vane 34, and is smaller than the large hole portion 35a. The small hole part 35b which consists of a hole and opens to the other (henceforth "non-pressure chamber") 39b of the two chambers 39a and 39b divided by the vane 34 is comprised. The check valve 36 is a sphere having a diameter smaller than the inner diameter of the large hole portion 35a and larger than the inner diameter of the small hole portion 35b, and is provided movably in the large hole portion 35a. The large hole portion 35a is provided with a stopper 37 for preventing the check valve 36 from falling off. In this embodiment, the vane 34 is provided with a valve mechanism, but instead of the vane 34, a valve mechanism may be provided in the partition wall 33 that partitions a space filled with oil.
[0023]
According to such a valve mechanism, when oil flows into the passage 35 from the large hole portion 35a side, the check valve 36 moves under the pressure, and comes into contact with the boundary portion between the large hole portion 35a and the small hole portion 35b. . Thereby, since the channel | path 35 is closed, the movement of the oil through this channel | path 35 is blocked | prevented. On the other hand, when the oil flows into the passage 35 from the small hole portion 35b side, the check valve 36 receives the pressure and moves in a direction opposite to the above to move from the boundary between the large hole portion 35a and the small hole portion 35b. Separate. As a result, the passage 35 is opened, so that the oil can move from the non-pressure chamber 39b to the pressure chamber 39a through the passage 35.
[0024]
The rotary damper employed as the hydraulic damper 30 includes a groove 38 formed so that oil pressed by the vane 34 can pass when moving between the chambers 39a and 39b. It is preferable. The groove 38 is preferably formed in at least the swing range of the vane 34 from the fully closed position O to the fully open position Q.
[0025]
Without the groove 38, when the oil in the pressure chamber 39a is pressed against the vane 34, the oil cannot pass through the passage 35 formed in the vane 34 by the function of the check valve 36. Then, it moves to the non-pressure chamber 39b through a slight gap formed between the vane 34 and the casing 31. Accordingly, a large pressure of oil is applied to the vane 34 at that time, and a braking force that makes the rotation of the arm 10 slow is generated. However, by providing this groove 38, the oil in the pressure chamber 39 a cannot pass through the passage 35 formed in the vane 34 due to the function of the check valve 36. Since it can move to 39b, the pressure of the oil applied with respect to the vane 34 in that case becomes a small thing.
[0026]
Therefore, this groove 38 is formed in the swing range of the vane 34 from the fully closed position O to the fully open position vicinity Q so that the arm 10 reaches the fully open position vicinity Q from the fully closed position O. In the meantime, according to the above principle, the braking force of the hydraulic damper 30 acting on the arm 10 can be reduced to such an extent that the rotation of the arm 10 is not affected.
[0027]
Further, by not forming such a groove 38 in the swinging range of the vane 34 from the vicinity of the fully open position Q to the fully open position R, the arm 10 can reach the fully open position R from the vicinity of the fully open position Q. In the meantime, according to the above principle, the hydraulic damper 30 can exert a large braking force, and the rotational speed of the arm 10 that rotates in the opening direction can be decelerated against the biasing force of the spring 20 described above. Become.
[0028]
The groove 38 is preferably formed so that the oil pressure gradually increases as the vane 34 swings in one direction. That is, it is preferable that the groove 38 is formed so that either one or both of the width and depth thereof becomes gradually smaller as the vane 34 swings in one direction. According to the groove 38 having such a shape, it is possible to gradually increase the oil pressure as the vane 34 swings in one direction, and gradually as the vane 34 swings in the opposite direction. Since the oil pressure can be reduced, the rotation of the arm 10 and the opening / closing operation of the trunk lid 70 can be made smoother.
[0029]
According to the opening / closing mechanism of the present embodiment configured as described above, when the lock of the trunk lid 70 is released, the arm 10 is rotated in the opening direction by the action of the spring 20 described above, and the trunk lid 70 is entirely It automatically opens from the closed position O to near the fully closed position P (see FIG. 5). At this time, in the rotary damper as the hydraulic damper 30, the vane 34 swings in one direction and presses the oil in the pressure chamber 39a as the arm 10 rotates in the opening direction. As described above, the oil in the pressure chamber 39a can move to the non-pressure chamber 39b through the groove 38 even though the check valve 36 cannot pass through the passage 35 formed in the vane 34. Therefore, the pressure of oil applied to the vane 34 at that time is small. Accordingly, the trunk lid 70 opens without being affected by the small braking force exerted by the hydraulic damper 30.
[0030]
When opening the trunk lid 70 from the vicinity of the fully closed position P to the vicinity of the fully open position Q, it is necessary to open the trunk lid 70 so as to lift the trunk lid 70 with a hand. Since the braking force exerted by the damper 30 is so small as not to affect the opening operation of the trunk lid 70, the biasing force (T) of the spring 20 and the trunk lid can be reduced without imposing a heavy burden on the operator. The trunk lid 70 can be opened by a force corresponding to the combined torque (TM) of the load moment (M) of 70.
[0031]
When the trunk lid 70 is opened to the vicinity of the fully open position Q with the hand attached to the trunk lid 70, the attached hand is released by the action of the spring 20 from the vicinity of the fully open position Q to the fully open position R. Even so, the trunk lid 70 is automatically opened until the fully open position R is reached. At this time, the trunk lid 70 tries to jump up vigorously by the strong urging force (T) of the spring 20, but the arm 10 opens the arm 10 against the urging force (T) of the spring 20 by the action of the hydraulic damper 30. By reducing the rotational speed in the direction, the opening operation of the trunk lid 70 can be made slow. That is, in the rotary damper as the hydraulic damper 30, the groove 38 does not exist or does not exist in the swinging range of the vane 34 from the vicinity of the fully open position Q to the fully open position R of the arm 10. Since the rotary damper is formed to be very small, the rotary damper exhibits a large braking force as described above in the opening direction until the arm 10 reaches the fully open position R from the vicinity of the fully open position Q. Since the rotational speed of the rotating arm 10 is decelerated, the opening operation of the trunk lid 70 is slow.
[0032]
The trunk lid 70 opened to the fully open position R is stably held without being fluctuated at the fully open position R by the strong biasing force (T) of the spring 20.
[0033]
When the trunk lid 70 located at the fully open position R is closed, it is necessary to push the trunk lid 70 and push it downward. At this time, the rotary damper as the hydraulic damper 30 according to the present embodiment is unidirectional. Therefore, the braking force exerted by the rotary damper does not act on the trunk lid 70 that performs the closing operation.
[0034]
That is, in the rotary damper as the hydraulic damper 30, when the trunk lid 70 is rotated in the closing direction, the vane 34 is swung in the direction opposite to the above as the arm 10 is rotated in the closing direction. The oil in the pressure chamber 39b is pressed. The oil in the non-pressure chamber 39b flows into the passage 35 from the small hole portion 35b side, and the check valve 36 moves in the large hole portion 35a under the pressure to move the large hole portion 35a and the small hole portion 35b. Separated from the boundary. Accordingly, the passage 35 is opened, and the oil can move from the non-pressure chamber 39b to the pressure chamber 39a through the passage 35, so that the pressure of the oil applied to the vane 34 becomes small. Therefore, the trunk lid 70 is closed without being affected by the small braking force exerted by the hydraulic damper 30. Accordingly, the operator can rotate the trunk lid 70 from the fully open position R in the closing direction with a small force.
[0035]
Further, in the present embodiment, the spring 20 has a smaller rotational moment than the load moment (M) due to the weight of the trunk lid 70 in the rotation angle range from the vicinity P of the fully closed position to the vicinity Q of the fully open position. Since the one that exerts the power (T) is adopted, if the trunk lid 70 is pushed down from the fully open position R to near the fully open position Q, after that, it is necessary to release the hand from the trunk lid 70 and apply no external force. However, the trunk lid 70 can be automatically rotated in the closing direction until the trunk lid 70 reaches the vicinity P of the fully closed position.
[0036]
When the trunk lid 70 is closed from the fully closed position P to the fully closed position O, an external force is applied to the trunk lid 70, and at this time, the trunk lid 70 acts on the trunk lid 70. Further, only the urging force (T) of the spring 20 and the inertia of the trunk lid 70 that rotates in the closing direction also work, so that the burden on the operator can be made very small.
[0037]
FIG. 7 is a plan view showing a main part of an opening / closing mechanism according to another embodiment of the present invention. As shown in this figure, the open / close mechanism according to the present embodiment is configured to include the arm 10, the spring 20, and the hydraulic damper 30 as in the above embodiment. Instead, it differs from the above embodiment in that a spiral spring is employed.
[0038]
Also by the opening / closing mechanism of the present embodiment, by using a spiral spring that can perform the same function as the coil spring adopted in the above embodiment, the same effects as the opening / closing mechanism according to the above embodiment can be obtained. Is possible.
[0039]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a trunk lid opening / closing mechanism capable of improving operability as compared with the conventional one and stably holding the trunk lid in the fully opened position. It becomes.
[Brief description of the drawings]
FIG. 1 is a plan view showing a main part of an opening / closing mechanism according to an embodiment of the present invention.
FIG. 2 is a left side view showing a main part of the opening / closing mechanism according to the above embodiment.
FIG. 3 is a right side view showing a main part of the opening / closing mechanism according to the above embodiment.
4 is a view showing the internal structure of the hydraulic damper employed in the above embodiment, wherein (a) is a longitudinal sectional view, and (b) is a sectional view taken along the line AA of (a). FIG. It is.
FIG. 5 is a diagram for explaining the operation of the opening / closing mechanism according to the above embodiment;
FIG. 6 is a graph showing the relationship between the rotational position of the trunk lid, the biasing force of the spring acting on the trunk lid, and the combined torque of the spring biasing force and the load moment of the trunk lid.
FIG. 7 is a plan view showing a main part of an opening / closing mechanism according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Arm 20 Spring 30 Hydraulic damper 31 Casing 32 Rotor 33 Partition part 34 Vane 35 Passage 35a Large hole part 35b Small hole part 36 Check valve 37 Stopper 38 Groove 39a Pressure chamber 39b Non-pressure chamber 40 Bracket 50 Support shaft 60 Car body 70 Trunk lid

Claims (5)

A trunk lid opening / closing mechanism that closes an opening of a trunk room provided in an automobile, and is provided between a vehicle body and a trunk lid, and supports an openable / closable track lid, and an opening direction of the arm. A spring that biases the rotation; and a hydraulic damper that decelerates the rotational speed of the arm in the opening direction against the biasing force of the spring, and the spring rotates in the opening direction. Is larger than the load moment due to the trunk lid's own weight in the rotation angle range from the fully closed position to the fully closed position and the rotation angle range from the fully open position to the fully open position. from in rotational angle range up to the vicinity of the fully open position, the opening, characterized in that it is intended to exert a smaller biasing force than the load moment due to the weight of the trunk lid Mechanism.   The opening / closing mechanism according to claim 1, wherein the hydraulic damper is unidirectional to reduce only the rotational speed of the arm in the opening direction.   The hydraulic damper divides a space filled with oil into two chambers, a vane that swings with the rotation of the arm and presses the oil, and at least the arm moves from the fully closed position to the fully open position. It is characterized by comprising a rotary damper having a groove formed so that oil pressed by the vane can pass when moving between the chambers in a swing range of the vane to the end. The opening / closing mechanism according to claim 1.   The opening / closing mechanism according to claim 3, wherein the groove is formed so that the oil pressure gradually increases as the vane swings in one direction.   The rotary damper includes a partition that partitions a space filled with oil or the vane, and a passage through which oil can pass and a check valve that allows the oil that passes through the passage to flow in only one direction. The opening / closing mechanism according to claim 3 or 4, wherein a valve mechanism is provided.

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