JP5043485B2 - Repulsive force generation mechanism - Google Patents

Description

  The present invention relates to a reaction force generation mechanism that is provided so as to be openable and closable with respect to a vehicle body via a hinge and applies a reaction force in an opening direction to a door that generates torque to be closed by its own weight.

  As the back door of a vehicle, a flip-up type that allows easy loading and unloading of luggage is often used. The flip-up type back door generates a torque that tends to close due to its own weight, and is therefore provided with a repulsive force generation mechanism that applies a reaction force in the opening direction.

As this repulsive force generating mechanism, a gas spring using a reaction force of the enclosed gas is used in which one end portion is attached to the vehicle body and the other end portion is attached to a portion other than the rotation center axis of the back door (for example, patent) Reference 1).
Japanese Patent Laying-Open No. 2005-88647 (see FIG. 11)

However, when the door is enlarged and the door is heavy, the gas spring is also enlarged to obtain a large repulsive force, and the repulsive force generating mechanism is enlarged.
In addition, since gas is used, there is a problem that the characteristics of repulsive force change greatly depending on the temperature.

  The present invention has been made in view of the above problems, and an object thereof is to provide a repulsive force generation mechanism that is small in size and has little change in the characteristics of the repulsive force.

  The invention according to claim 1 is provided on a door that is openable and closable with respect to the vehicle body via a hinge, and is provided on a door that generates a torque to be closed by its own weight. In the force generation mechanism, one end portion is attached to the vehicle body side, the other end portion side is attached to the reaction force generation mechanism side, and an elastic spring whose repulsive force decreases as the door opening increases; A repulsive force conversion unit that receives the repulsive force of the elastic spring, converts the repulsive force of the elastic spring, and gives an opening direction torque to the door, and the opening degree of the door increases And a repulsive force conversion unit that increases a torque in the opening direction with respect to the door.

  Depending on the opening of the door, the spring generates a repulsive force. The repulsive force of the spring is input to the repulsive force conversion unit. Here, as the opening of the door increases, the repulsive force of the elastic spring is converted so that the torque in the opening direction with respect to the door increases, and the torque in the opening direction is applied to the door.

  According to a second aspect of the present invention, the elastic spring is a spiral spring having an outer end fixed to the vehicle body side and an inner end connected to the repulsive force converting portion. A first non-circular gear connected to the inner end of the spiral spring and driven to rotate by the repulsive force of the spiral spring; a second non-circular gear meshed with the first non-circular gear; and one end portion 2. The repulsive force according to claim 1, further comprising: a torque applying unit that is connected to the second non-circular gear, has the other end connected to the door, and applies torque in the opening direction to the door. It is a generation mechanism.

  According to a third aspect of the present invention, the elastic spring is a spiral spring having an outer end fixed to the vehicle body side and an inner end connected to the repulsive force converting portion. A first eccentric gear connected to the inner end of the spiral spring and driven to rotate by the repulsive force of the spiral spring, and provided so as to be able to approach / detach from the first eccentric gear, A meshable second eccentric gear, a guide for guiding the second eccentric gear to mesh with the first eccentric gear, one end connected to the second eccentric gear, and the other end connected to the second eccentric gear The repulsive force generating mechanism according to claim 1, further comprising: a torque applying unit that is connected to the door and applies a torque in the opening direction to the door.

According to a fourth aspect of the present invention, there is provided a slot for loosely fitting the rotation shaft of the second eccentric gear, and biasing means for biasing the second eccentric gear in a direction to mesh with the first eccentric gear. The repulsive force generation mechanism according to claim 3, wherein:

  In the present invention, examples of the torque applying means of the repulsive force converting unit include a rod having one end connected to the repulsive force converting unit and the other end connected to the door, and one end to the repulsive force converting unit. There is a gas spring that is connected and has the other end connected to the door, but is not limited thereto.

  According to the first to third aspects of the present invention, the repulsive force generating mechanism has one end portion attached to the vehicle body side, the other end portion side attached to the door side, and the repulsion force generating mechanism as the door opening increases. An elastic spring for reducing the force, and a repulsive force conversion unit that is provided on the vehicle body side, receives the repulsive force of the elastic spring, converts the repulsive force of the elastic spring, and gives torque in the opening direction to the door And a repulsive force conversion unit that increases the torque in the opening direction with respect to the door as the opening of the door increases, so that even if the door becomes larger and the door becomes heavier, The repulsive force generation mechanism can be reduced in size by optimally setting the torque in the opening direction of the force conversion portion with respect to the door. In addition, by using an elastic spring, the characteristics of repulsive force due to high and low temperatures are small.

  According to the invention which concerns on Claim 2, even if a door enlarges and the weight of a door becomes heavy, the shape of the 1st non-circular gear of a repulsive force conversion part and a 2nd non-circular gear is set optimally. Thus, the repulsive force generation mechanism can be reduced in size. In addition, by using an elastic spring, the characteristics of repulsive force due to high and low temperatures are small.

  According to the invention which concerns on Claim 3, Claim 4 Even if a door enlarges and the weight of a door becomes heavy, the guide of a repulsive force conversion part, the shape of the 1st eccentric gear, and the 2nd eccentric gear By setting the shape optimally, the repulsive force generation mechanism can be reduced in size. In addition, by using an elastic spring, the characteristics of repulsive force due to high and low temperatures are small.

  According to the fourth aspect of the present invention, the biasing means for biasing the second eccentric gear in the direction of meshing with the first eccentric gear is provided. Even if the eccentric gear and the second eccentric gear are not in the designed positions, the first eccentric gear and the second eccentric gear are always engaged.

[First Embodiment]
Initially, the whole structure of this example is demonstrated using FIG. In the figure, at the rear part of the vehicle body 1, a flip-up type door (back door) 3 is provided that can be opened and closed with respect to the vehicle body 1 via a hinge and generates a torque to be closed by its own weight. .

The vehicle body 1 is provided with a reaction force generation mechanism 11 that applies a reaction force in the opening direction to the door 3.
Next, the reaction force generation mechanism 11 will be described with reference to FIGS. 1 and 3 to 5. As shown in FIGS. 1 and 4, the reaction force generation mechanism 11 has one end attached to the vehicle body 1 and the other end attached to the reaction force generation mechanism 11, and serves as an elastic spring that generates a reaction force. The spring spring 21 is provided on the vehicle body 1 side, and the repulsive force of the spiral spring 21 spring is input, and the spring repulsive force is increased so that the opening torque on the door 3 increases as the opening of the door 3 increases. It consists of a repulsive force conversion part 31 that converts and gives torque in the opening direction to the door 3.

  The repulsive force conversion unit 31 has a base 33 provided on the vehicle body 1. Holes 33 a and 33 b are formed in the base 33, and a bent portion 33 c that is bent away from the vehicle body 1 is formed.

  The substantially elliptical first non-circular gear 41 and the pin 43 attached to the rotation center hole of the first non-circular gear 41 rotate together by a method such as serration. The pin 43 is loosely fitted in the hole 33a of the base 33 and attached to the base 33 by a caulking method or the like.

  Similarly, the substantially non-circular second non-circular gear 51 and the pin 53 attached to the rotation center hole of the second non-circular gear 51 rotate together by a method such as serration. The pin 53 is loosely fitted into the hole 33b of the base 33 and attached to the base 33 by a method such as caulking.

  As shown in FIGS. 1 and 5, the inner end of the spiral spring 21 is engaged with a slit 43 a formed on the pin 43, and the outer end of the spiral spring 21 is connected to the base 33. The bent portion 33c is engaged. Therefore, the first non-circular gear 41 is rotationally driven by the repulsive force of the spiral spring 21 via the pin 43.

  As shown in FIGS. 1 and 4, the second non-circular gear 51 is provided with torque applying means 61 that applies a torque in the opening direction to the door 3. The torque application means 61 of this embodiment has the following configuration.

  An arm 63 is attached to the pin 53 of the second non-circular gear 51 so as to rotate integrally with the pin 53. A lower end portion of the gas spring 65 is rotatably attached to the rotation end portion of the arm 63. The upper end of the gas spring 65 is rotatably attached to a portion other than the rotation center axis of the door 3.

The spiral spring 21 is set so that it is wound up most in the state in which the door 3 is closed, the repulsive force is the largest, and the repulsive force decreases as the door 3 opens.
Further, as shown in FIG. 3, the first non-circular gear 41 and the second non-circular gear 51 are set in such a shape that they always mesh when attached to the base 33. That is, as shown in FIG. 3, if the center distance between the two gears is T, the pitch radius of the first non-circular gear 41 is a and the pitch radius of the second non-circular gear 51 is b. = T.

  Further, the pitch radius of the first non-circular gear 41 when the door is fully closed as indicated by a solid line is as, the pitch radius of the second non-circular gear 51 is as bs, and the first non-circular gear 51 when the door is fully open indicated by a two-dot chain line. Assuming that the pitch radius of the circular gear 41 is ao and the pitch radius of the second non-circular gear 51 is bo, bs / as <bo / ao. That is, as the opening degree of the door 3 increases, the torque in the opening direction of the repulsive force input to the first non-circular gear 41 with respect to the door 3 increases.

Next, the operation of the above configuration will be described.
Depending on the opening of the door 3, the spiral spring 21 generates a repulsive force. The repulsive force of the spiral spring 121 is input to the repulsive force conversion unit 31. Here, as the opening degree of the door 3 increases, the repulsive force of the spiral spring 21 is converted so that the torque in the opening direction with respect to the door 3 increases, and the opening direction with respect to the door 3 via the torque applying means 61 is converted. Torque is given.

  According to the above configuration, even when the door 3 is enlarged and the door 3 is heavy, the shapes of the first non-circular gear 41 and the second non-circular gear 51 of the repulsive force conversion unit 31 are optimally set. By doing so, the reaction force generation mechanism 11 can be reduced in size. Further, by using the elastic spring (spiral spring 21), the characteristics of the repulsive force due to the temperature level are also small.

  The present invention is not limited to the above embodiment. Although the gas spring 65 is used as the torque applying means 61, the gas spring 65 is unnecessary if the torque sufficient to open the door 3 can be obtained with only the spiral spring 21, and a simple rod is used instead of the gas spring 65. It may be.

Further, the gas spring 65 may be provided in another place, and a simple rod may be used instead of the gas spring 65.
[Second Embodiment]
The difference between the present embodiment and the first embodiment is a repulsive force conversion unit, and the other parts are the same as those of the first embodiment. Therefore, the repulsive force conversion unit will be described, and the description of other parts will be omitted.

  Next, the reaction force generation mechanism 111 will be described with reference to FIGS. As shown in FIG. 7, the reaction force generation mechanism 111 has one end portion attached to the vehicle body side and the other end portion attached to the reaction force generation mechanism 111 side, and a spiral spring 121 as an elastic spring that generates a repulsion force. The repulsive force of the spiral spring 121 is input to the vehicle body side, and the repulsive force of the spring is converted so that the torque in the opening direction with respect to the door 3 increases as the door opening increases. On the other hand, it is composed of a repulsive force conversion unit 131 that applies torque in the opening direction.

  The repulsive force conversion unit 131 has a base 133 provided on the vehicle body 1. The base 133 has a hole 133a and a long hole 133b. Further, on the base 133, a spring locking portion 134 extending in a direction away from the vehicle body is provided.

  The first eccentric gear 141 and the pin 143 attached to the rotation center hole of the first eccentric gear 141 rotate together by a method such as serration. Then, the pin 143 is loosely fitted into the hole 133a of the base 133 and attached to the base 133 by a caulking method or the like.

  Similarly, the second eccentric gear 151 and the pin 153 attached to the rotation center hole of the second eccentric gear 151 rotate together by a method such as a square hole. Then, the pin 153 is loosely fitted in the long hole 133b of the base 133, and is attached to the base 33 by a caulking method or the like. In addition, the extending direction of the long hole 133b is a direction in which the second eccentric gear 151 passes through the hole 133a and can approach / detach from the first eccentric gear 141.

  The elongated hole 133b is provided with a spring 171 that pushes the pin 153, which is the rotation center axis of the second eccentric gear 151, and biases the second eccentric gear 151 in the direction of meshing with the first eccentric gear 141. It has been.

  As shown in FIG. 8, the inner end portion of the spiral spring 121 described above engages with the slit portion 143 a formed on the pin 143, and the outer end portion of the spiral spring 21 is the spring locking portion 134 of the base 133. Is engaged. Therefore, the first eccentric gear 141 is rotationally driven by the repulsive force of the spiral spring 121 via the pin 143.

  Similar to the first embodiment, the second eccentric gear 151 is provided with a torque applying means for applying a torque in the opening direction to the door. As in the first embodiment, the torque applying means of the present embodiment includes an arm 163 attached to the pin 153, a lower end portion rotatably attached to the rotating end portion of the arm 163, and an upper end portion of the door. It consists of a gas spring that is rotatably attached to a place other than the rotation center axis.

The second eccentric gear 151 has a guide hole 155 as a guide. On the other hand, a pin 135 that engages with the guide hole 155 is provided on the base 133.
The spiral spring 121 is set so that the coil is wound up most when the door is closed, the repulsive force is the largest, and the repulsive force decreases as the door opening increases.

The shape of the guide hole 155 is a guide shape so that the second eccentric gear 151 is always meshed with the first eccentric gear 141.
FIGS. 9 to 14 show the movement of the first eccentric gear 141 and the second eccentric tooth 151 wheel when the door is fully closed to when the door is fully open.

  Assuming that the pitch radius of the first eccentric gear 141 when the door is fully closed as shown in FIG. 9 is as and the pitch radius of the second eccentric gear 151 is bs as shown in FIG. 9, the pitch of the first eccentric gear 141 when the door is fully open shown in FIG. Assuming that the radius is ao and the pitch radius of the second eccentric gear 151 is bo, bs / as <bo / ao. That is, the shape of the guide hole 155 is set so that the torque in the opening direction of the repulsive force input to the first eccentric gear 141 with respect to the door 3 increases as the opening degree of the door 3 increases.

Next, the operation of the above configuration will be described.
Depending on the opening of the door, the spiral spring 121 generates a repulsive force. The repulsive force of the spiral spring 121 is input to the repulsive force conversion unit 131. Here, as the opening of the door increases, the repulsive force of the spiral spring 121 is amplified so that the torque in the opening direction with respect to the door 3 increases, and the torque in the opening direction is given to the door via the torque applying means. It is done.

  According to the above configuration, the guide hole 155 of the repulsive force conversion unit 131, the shape of the first eccentric gear 141, and the shape of the second eccentric gear 151 are increased even when the door becomes larger and the weight of the door increases. By setting optimally, the repulsive force generating mechanism can be miniaturized. In addition, by using an elastic spring (spiral spring 121), the characteristics of repulsive force due to high and low temperatures are also small.

  In addition, by providing a spring 171 that biases the second eccentric gear 151 in a direction to mesh with the first eccentric gear 141, the first eccentric gear 141 and the second eccentric gear due to dimensional error of each component. Even when the gear 151 is not in the position as designed, the first eccentric gear 141 and the second eccentric gear 151 are always engaged.

It is a disassembled perspective view of the principal part of the reaction force generation mechanism of the 1st form example. It is a figure explaining the vehicle provided with the reaction force generation mechanism of the 1st form example. It is a figure explaining a motion of the 1st non-circular gear of the reaction force generating mechanism of the 1st form example, and the 2nd non-circular gear. FIG. 4 is a cross-sectional view taken along section line IV-IV in FIG. 1. It is a V direction arrow directional view of FIG. It is a figure explaining the motion of the 1st eccentric gear of the reaction force generation mechanism of the 2nd example, and the 2nd eccentric gear. It is sectional drawing of the reaction force generation mechanism of the 2nd form example. It is a VIII direction arrow line view of FIG. It is a figure explaining a motion of the 1st eccentric gear and the 2nd eccentric gear. It is a figure explaining a motion of the 1st eccentric gear and the 2nd eccentric gear. It is a figure explaining a motion of the 1st eccentric gear and the 2nd eccentric gear. It is a figure explaining a motion of the 1st eccentric gear and the 2nd eccentric gear. It is a figure explaining a motion of the 1st eccentric gear and the 2nd eccentric gear. It is a figure explaining a motion of the 1st eccentric gear and the 2nd eccentric gear. It is a figure explaining a motion of the 1st eccentric gear and the 2nd eccentric gear.

Explanation of symbols

11 Reaction Force Generation Mechanism 21 Spiral Spring 31 Repulsive Force Conversion Unit

Claims (4)

In a reaction force generation mechanism that is provided so as to be openable and closable via a hinge with respect to the vehicle body, and that gives a reaction force in the opening direction to a door that generates torque to close by its own weight
One end part is attached to the vehicle body side, the other end part side is attached to the reaction force generation mechanism side, and an elastic spring whose reaction force decreases as the opening of the door increases,
A repulsive force conversion unit provided on the vehicle body side, which receives a repulsive force of the elastic spring, converts the repulsive force of the elastic spring, and applies torque in an opening direction to the door. As the degree increases, the repulsive force conversion unit increases the torque in the opening direction with respect to the door;
A repulsive force generation mechanism characterized by comprising: The elastic spring is
A spiral spring having an outer end fixed to the vehicle body side and an inner end connected to the repulsive force conversion unit;
The repulsive force conversion unit is
A first non-circular gear connected to the inner end of the spiral spring and driven to rotate by the repulsive force of the spiral spring;
A second non-circular gear meshed with the first non-circular gear;
One end is connected to the second non-circular gear, the other end is connected to the door, and torque applying means for applying torque in the opening direction to the door;
The repulsive force generating mechanism according to claim 1, comprising: The elastic spring is
A spiral spring having an outer end fixed to the vehicle body side and an inner end connected to the repulsive force conversion unit;
The repulsive force conversion unit is
A first eccentric gear connected to an inner end of the spiral spring and driven to rotate by a repulsive force of the spiral spring;
A guide extending toward the rotation axis of the first eccentric gear;
A second eccentric gear that is movably engaged with the guide and that can mesh with the first eccentric gear;
A guide for guiding a second eccentric gear so as to mesh with the first eccentric gear;
One end portion is connected to the second eccentric gear, the other end portion is connected to the door, and torque applying means for applying an opening direction torque to the door;
The repulsive force generating mechanism according to claim 1, comprising: 4. The repulsive force generating mechanism according to claim 3 , further comprising an urging means for urging the rotation shaft of the second eccentric gear in a direction to mesh with the first eccentric gear.

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