JPH0510064A - Auxiliary device for opening and closing door - Google Patents

Abstract

PURPOSE:To secure an opening moment larger than a specified figure in the fully opened condition of a door and to lessen the operation force on opening or closing the door to improve the operational workability. CONSTITUTION:A damper stay 5 is interposed between a car body 1 and the back door 2 to reinforce the opening or closing force and the one end of the damper say 5 is pivoted by the car body 1 and the other end thereof is fitted to freely slide in a certain range the guide face formed in the far and near direction against the pivot 3 of the back door 2 in the guide member 4 fitted to the back door 2. The guide face is formed so that the angle of the axial line of damper stay 5 with the guide face becomes an acute angle until it is some position a little before a specified angle from the completely closed position of the door to the fully opened position and also becomes perpendicular or an obtuse angle until it is before the fully opened position over some position a little before a specified angle. The other end of damper stay 5 is fitted to the end near the pivot 3 of the guide face to lessen the rising-up moment while it is in some position before a specified angle against the interval from the completely closed position to the fully opened position and the other end of the damper stay 5 is transferred to the far end from the pivot 3 when it directs to the fully opened position through over a specified angle position to enlarge the opening moment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door opening / closing assisting device which uses a damper stay to assist the opening / closing force of a door such as a back door at the rear of a vehicle body which opens and closes.

[0002]

2. Description of the Related Art Conventionally, in an automobile having a back door that opens and closes up and down, as shown in FIG. 8, the self weight of the back door 32 is canceled at the time of opening and closing, and the back door 32 is held by itself while being opened upward. Therefore, the damper stay 33 is interposed between the vehicle body 31 and the back door 32. This damper stay 33 is normally pivotally supported at one end 33a thereof on the vehicle body 31 and at the other end 33b thereof by the back door 32.

The damper stay 33 is disclosed in US Pat. No. 4,513,953 because the operating characteristics change when the working gas contained therein expands and contracts due to the ambient temperature and the gas pressure changes. As described above, there is known one provided with a temperature compensating unit that changes the volume of the gas chamber of the operating unit depending on the temperature.

On the other hand, in Japanese Patent Laid-Open No. 63-142176, the damper stay is supported so that its pivot position with respect to the door is tangentially movable with respect to the pivot shaft of the door, and the damper stay operates by a temperature change. It is disclosed that a temperature compensation device for moving the support point at the other end is provided.

[0005]

By the way, as described above, both ends 33a and 33b of the damper stay 33 are connected to the vehicle body 31.
And fixedly attached to the back door 32 or adjustable in position for temperature compensation, the weight moment of the back door 32 at each opening and the flip-up moment of the damper stay 33 are the same as those of the back door 32. In the closed position, the repulsive force of the damper stay 33 itself is the maximum, but it is small because the arm length L of the moment is short. Since the increase in the length L is larger, it gradually increases, and becomes maximum at a position smaller by a predetermined angle than the fully open position,
After that, since the arm length L does not change much, the repelling moment decreases as the repulsive force decreases. Further, at the fully open position, the flip-up moment is larger than the self-weight moment, and it is designed so as to obtain an opening moment above a certain level.

Also, due to the conditions of use of automobiles, -30 ° C
It is designed to ensure the above opening moment in the temperature range from to + 80 ° C. To give specific numerical examples, for example, the operating force F at the tip of the back door is designed to be equivalent to 1 kg at -30 ° C. when fully opened. However, when trying to secure the above-mentioned opening moment in the fully opened state of -30 ° C, the maximum opening moment at the opening position where the repelling moment becomes the maximum becomes considerably larger than that, especially when the temperature rises. However, there is a problem that the operating force Fmax becomes large and the operability deteriorates. That is, even if the damper stay 33 is provided with a temperature compensating mechanism, it does not normally perform 100% compensation, so that the maximum opening moment becomes considerably large at 20 ° C. which is the standard state, as shown in FIG.
Further, since it becomes extremely large at 80 ° C., there is a problem that the maximum operation force Fmax for closing the back door becomes large and the operation feeling becomes very bad.

In view of the above-mentioned conventional problems, the present invention provides a door opening / closing assisting device which can secure an opening moment more than a predetermined value in a fully opened state of the door, has a small operation force at the time of opening / closing, and has good operability. The purpose is to

[0008]

In order to achieve the above object, the door opening / closing assisting device of the present invention includes a damper stay for assisting the opening / closing force between a door and a vehicle body which are supported by the vehicle body so as to be opened and closed vertically. In the intervening door opening / closing assisting device, one end of the damper stay is pivotally supported on the vehicle body, and the other end is along a guide surface formed in a perspective direction with respect to a pivot shaft of the door on a guide member attached to the door. A certain range is slidably engaged, and the angle between the axis of the damper stay and the guide surface is an acute angle from the door fully closed position to a predetermined angle before the fully open position, and the guide surface is fully opened beyond the front angle. It is characterized in that it is formed to be vertical or obtuse angle up to the position.

Preferably, the guide surface is arranged at a position intersecting the axis of the damper stay.

Further, at the other end of the damper stay, a roller for rolling the guide surface is supported at both ends, and a disengagement prevention groove for preventing engagement and disengagement of the guide surface and the roller is provided along a side of the guide surface along the guide surface. And an engaging shaft portion that engages with the separation preventing groove from the roller side.

[0011]

According to the above-mentioned structure of the present invention, the axis of the damper stay is at an acute angle with respect to the guide surface from the fully closed position to the front position at a predetermined angle with respect to the fully opened position. Since it engages with the end of the surface near the pivot point of the door, the rebounding moment due to the damper stay is small due to the short length of the arm, while when it goes beyond the above predetermined angle position toward the fully open position, the damper stay Since the axis line of is vertical or obtuse with respect to the guide surface, the other end of the damper stay moves to the end far from the door pivot of the guide surface and the length of the arm becomes longer, increasing the rebounding moment, A sufficient opening moment can be secured to hold the valve in its fully open position against its own moment of weight, and as a result, the operating force during opening and closing is small and the opening moment above the specified value is required in the fully opened state. It can be coercive.

Further, by disposing the guide surface at a position intersecting the axis of the damper stay, the moment due to the offset between the guide surface and the axis of the damper stay may act and the other end of the damper stay may not slide smoothly. It is possible to eliminate such inconvenience.

Further, a roller for rolling the guide surface is provided at the other end of the damper stay, and the roller is supported by both ends of the roller.
In addition, by providing the separation preventing groove and the engaging shaft portion that engages with the separation preventing groove, it is possible to slide more smoothly and prevent the roller from separating from the guide surface.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 is a vehicle body of an automobile, and 2 is a back door for opening and closing a rear surface opening. Back door 2
Is supported by a rear end portion of the roof of the vehicle body 1 via a pivot shaft 3 attached to the upper end thereof so as to be vertically openable and closable. A guide member 4 is attached to both sides of the back door 2 at a position at an appropriate distance from the pivot shaft 3, and a base end portion of a damper stay 5 is engaged with the guide member 4. The tip end of the retractable shaft 6 of the damper stay 5 is pivotally supported by a pivot pin 7 at an intermediate position in the vertical direction on both sides of the rear end of the vehicle body 1. The guide member 4 and the pivot pin 7 are arranged so that, when the back door 2 is fully closed, the axis of the damper stay 5 passes behind the axis of the pivot shaft 3 by the length L of the arm of the flip-up moment. It is arranged.

The guide member 4 is shown in FIG. 2 and FIG.
As shown in (b), the sectional shape in the vehicle width direction is substantially inverted L.
It is composed of a member having an appropriate length in the shape of a letter, and one piece of the attachment piece 8 is attached to the back surface of the back door 2 with a bolt 8a,
An arc-shaped guide hole 10 having a predetermined length is formed in the other vertical piece 9, and the upper side surface thereof constitutes a guide surface 11.

On the outer surface of the bracket 12 having an L-shaped cross section fixed to the base end of the damper stay 5, the support shaft 1 is attached.
3. Engaging rollers 15 having flanges on both sides are rotatably attached via bearings 14. This engagement roller 1
5 is engaged in the guide hole 10 so as to roll along the guide surface 11 of the guide member 4, and its brim is engaged with the vertical piece 9 of the guide member 4 from both sides to prevent disengagement. . A notch 16 for fitting the engagement roller 15 into the guide hole 10 is provided in a part of the lower side portion of the guide hole 10.

On the guide surface 11, as shown in FIG. 4, the back door 2 extends from the fully closed position to the fully open position.
The guide surface 1 is located between 0 and 30 ° before the specified opening position.
The angle between the guide surface 11 at the contact point of 1 and the engagement roller 15 and the axis of the damper stay 5 is an acute angle, and is formed to be substantially vertical beyond the predetermined opening position to the fully open position.

According to the above construction, as shown in FIGS. 4 and 5, the back door 2 is placed in the fully closed position and the fully opened position by 20.
Since the angle formed between the axis of the damper stay 5 and the guide surface 11 at the contact point of the engagement roller 15 is an acute angle while the opening and closing is performed between the predetermined opening position of -30 ° before, the base end of the damper stay 5 is closed. The engaging roller 15 is engaged with the end portion of the guide groove 10 close to the pivot shaft 3, and therefore the rebounding moment by the damper stay 5 is small because the arm length L is short. On the other hand, when the damper stay 5 goes beyond the predetermined opening position toward the fully open position, the axis of the damper stay 5 becomes substantially perpendicular to the guide surface 11 at each opening position, so that the base end of the damper stay 5 is engaged. The roller 15 gradually moves toward the end of the guide groove 10 away from the pivotal shaft 3 according to the opening degree, and as a result, the arm length L of the flip-up moment by the damper stay 5 increases. The splashing moment becomes large. Therefore, a sufficient opening moment for holding the back door 2 at its fully open position against the moment of its own weight is secured. In this way, the operating force during opening and closing is small, and it is possible to secure an opening moment greater than a predetermined value in the fully opened state. That is, the guide member 4
In the case where the same opening moment is obtained in the fully opened state without providing the above, the flip-up moment as shown by the broken line in FIG. 5 acts and a large operating force is required during opening and closing. The splashing moment in the middle of opening and closing can be reduced by the amount indicated by the arrow in 5, and a smooth opening and closing operation is possible.

In the above embodiment, since the L-shaped bracket 12 is attached to the base end of the damper stay 5 and the engaging roller 15 is arranged on the outer surface thereof, the engaging roller 15 and the guide surface 11 are separated from each other. Since the engagement position is considerably distant from the axis line of the damper stay 5, a large moment acts on the contact portion between the engagement roller 15 and the guide member 4, and when the engagement roller 15 rolls, a large amount of force is applied to the collar. The upper end and the lower end may interfere with the vertical piece 9 of the guide member 4 in the opposite direction, and the engagement roller 15 may not roll smoothly.

In order to eliminate such a fear, as shown in FIG. 6, a U-shaped bracket 21 is attached to the base end of the damper stay 5 so that the engagement roller 15 is arranged on the axis of the damper stay 5 and at the same time. The support shaft 13 may be supported on both sides. In this case, the guide groove 1 of the guide member 4
Since it is not possible to fit the engagement roller 15 into the inside of 0, an inverted U-shaped guide member 22 opened downward as shown in FIG. 7 is provided, and the guide surface is provided on the end face of one vertical piece 23. 11 and the guide surface 1 on the other vertical piece 24.
A disengagement prevention groove 25 is provided to prevent the engagement roller 15 from disengaging from 1, and an engagement shaft portion 26 that engages with the disengagement prevention groove 25 is projected from the support shaft 13. The engagement shaft portion 26 is formed with a small-diameter portion 26a that engages in the separation prevention groove 25, and a separation prevention flange 26b is formed at the tip thereof.
Further, the separation prevention collar 26 is provided at an appropriate position of the separation prevention groove 25.
A notch 27 (see FIG. 7B) similar to the notch 16 in the above embodiment is provided to allow passage of b.

With this structure, the force is smoothly transmitted from the base end of the damper stay 5 to the guide surface 11 of the guide member 22 via the engaging roller 15 on the axis thereof, and the engaging roller 15 is smoothly moved. Roll on the guide surface 11. Further, since the separation prevention groove 25 and the engagement shaft portion 26 that engages with the separation prevention groove 25 are provided, the engagement roller 15 does not separate from the guide surface 11.

In the above embodiment, the damper stay 5 having the temperature compensating part is used and the guide member 4 is fixed at a fixed position. However, in order to supplement the temperature compensating, or the temperature compensating part is provided. In order to separately perform temperature compensation using a damper stay not provided, a mechanism for attaching the guide member 4 to the pivot shaft 3 so that the position thereof can be adjusted in the perspective direction may be added.

Further, in the above-mentioned embodiment, an example in which the engaging roller 15 is engaged with the guide hole 10 is shown as means for movably attaching the other end of the damper stay 5 to the back door 2, but a slide guide and a slider are shown. Other movable supporting means such as a combination of the above can be applied.

Further, although the above-mentioned embodiment shows the example applied to the back door, it is needless to say that the present invention can be similarly applied to the side door of the vertical opening / closing system.

[0026]

According to the door opening / closing assisting device of the present invention,
Since the axis of the damper stay is at an acute angle with respect to the guide surface between the fully closed position and the position before the fully open position by a predetermined angle, the other end of the damper stay engages with the end of the guide surface near the door pivot. Therefore, the splashing moment due to the damper stay is small because the length of the arm is short, and the axis of the damper stay becomes vertical or obtuse with respect to the guide surface when it goes beyond the above predetermined angle position toward the fully open position. Therefore, the other end of the damper stay moves to the end far from the door pivot of the guide surface, the length of the arm becomes longer, the rebounding moment becomes large, and a sufficient opening moment to hold the door in the fully open position can be secured. Therefore, the operating force during opening and closing is small, and the opening moment more than a predetermined value can be secured in the fully opened state, and moreover, the guide member having a simple structure is added to the door. To exert an effect that can be constructed at low cost so good.

Further, when the guide surface is arranged at a position intersecting with the axis of the damper stay, a moment may act due to the offset of the axis of the damper stay and the other end of the damper stay may not slide smoothly. Such inconvenience can be eliminated.

Further, a roller for rolling the guide surface is provided at the other end of the damper stay, both sides of the roller are supported, and a separation preventing groove and an engaging shaft portion for engaging with the separation preventing groove are provided.
It can be slid more smoothly and the engagement roller can be prevented from coming off the guide surface.

[Brief description of drawings]

FIG. 1 is a front view showing an overall configuration of a door opening / closing assisting device according to an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of the embodiment.

FIG. 3 shows a guide member of the same embodiment, (a) is a plan view and (b) is a front view.

FIG. 4 is an explanatory diagram of an operating state of the embodiment.

FIG. 5 is a graph showing the relationship between the opening of the door and the moment of weight and the moment of flipping up of the door according to the embodiment.

FIG. 6 is a sectional view of an essential part of another embodiment of the present invention.

7A and 7B show a guide member of the embodiment, FIG. 7A is a plan view, FIG. 7B is a front view, and FIG. 7C is a sectional view taken along line CC of FIG. 7B.

FIG. 8 is a front view showing an arrangement state of a damper stay of a conventional example.

FIG. 9 is a graph showing a relationship between a door opening, a weight moment and a flip-up moment in a conventional example.

[Explanation of symbols]

1 car body 2 back door 3 pivots 4 Guide member 5 Damper stay 7 pivot pins 11 Guide surface 15 Engaging roller 25 Detachment prevention groove 26 Engaging shaft

Claims (3)

[Claims] 1. A door opening / closing auxiliary device having a damper stay interposed between a door supported by a vehicle body so as to be vertically openable and closable and a vehicle body, and one end of the damper stay is pivotally supported on the vehicle body. The other end is slidably engaged with a guide member attached to the door along a guide surface formed in a perspective direction with respect to the pivot shaft of the door, and the guide surface is engaged with the axis of the damper stay and the guide. The angle formed by the surface is an acute angle from the door fully closed position to the predetermined angle front position of the fully open position,
A door opening / closing assisting device, which is formed so as to be vertical or obtuse angle beyond a predetermined angle front position to a fully open position. 2. The door opening / closing assisting device according to claim 1, wherein the guide surface is arranged at a position intersecting the axis of the damper stay. 3. A release prevention groove for supporting both ends of a roller which rolls a guide surface on the other end of the damper stay and for preventing engagement and disengagement of the guide surface and the roller is provided along a side of the guide surface along the guide surface. 3. The door opening / closing assisting device according to claim 2, further comprising an engaging shaft portion provided on the roller side so as to engage with the separation preventing groove from the roller side.