JPH04302685A - Closure device of back door for automobile - Google Patents

Abstract

PURPOSE:To provide a compact high output closure device with cost reduction. CONSTITUTION:When a latch base 40 is swung about one end and has the other end drawn down by a pulling-in mechanism 50 for example, a latch member 60 provided in the central section between one and the other ends of the latch base 40 pulls in a striker 12 to close fully a back door 10. Thus, a portion of the whole pulling-in force of the striker 12 is applied to the pulling-in mechanism 50 so that a large force will not be applied to input and output links 51, 52 of the pulling-in mechanism 50. Also, even if the tolerance of a pulling- down amount of the other and of the latch base 40 is doubled, the striker 12 can be accurately pulled in with a half tolerance.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention has a striker fixed to one side of the back door and the periphery of the door opening, and a latch member that engages and disengages from the striker on the other side of the back door and the periphery of the door opening. The present invention relates to a closing device for a back door for an automobile, which closes the back door by drawing in the striker via the latch member using power.

0002

2. Description of the Related Art In a conventional automobile back door closure device, for example, as disclosed in Japanese Unexamined Patent Publication No. 62-244988, a latch member is engaged with a striker on the back door side when the back door is closed. When this happens, the drive motor starts and the screw member extending vertically beneath the latch member rotates, the nut member is guided by the guide rail and moves downward, and the latch member attached to the nut member rotates. Some lower, thereby retracting the striker and closing the back door.

In general, there have been reports that squeaks, wind leakage, and flapping phenomena occur in the back doors of three-door hatchback sports cars due to wind pressure during high-speed driving.
The reason for this is a decrease in the batch-back seal reaction force. Particularly in North America, high-speed driving is common, and if it is a luxury car, the flapping phenomenon is treated as a defect, and even if the hatchback seal reaction force is set to a high value to prevent flapping, it will decrease considerably over time. need to be higher. By increasing the seal reaction force, the hatchback becomes less difficult to close. Therefore, using a closure device,
The back door is forcibly closed against the high seal reaction force.

0004

[Problems to be Solved by the Invention] However, in such conventional automobile back door closure devices,
, the screw member is configured to extend in the vertical direction directly below the latch member, and the force for drawing the striker against seal reaction force and the force for restraining the striker in the retracted state are directly applied to the screw member. For example, it is necessary to increase the meshing strength of the screw member, and since the feed amount of the screw member is directly the retraction amount of the striker, it is necessary to increase the feed accuracy of the screw member. The parts and the nut parts that screw into these parts must be made into forged or machined parts, and these parts become special and exclusive parts.Furthermore, due to the installation space, the screw parts are placed directly below the latch parts. If it is not possible to provide a nut member, a guide rail is required to guide the nut member in order to prevent malfunction, which poses a problem in that it becomes a major hindrance to reducing costs.

[0005] The present invention has been made in view of these conventional problems, and allows the striker to be retracted with high precision without increasing the rigidity or accuracy of the parts by sharing the force required to retract the striker. It is an object of the present invention to provide a closing device for a back door for an automobile, which has a configuration that can reduce costs.

[0006]

[Means for Solving the Problems] The gist of achieving this object is that a striker is fixedly installed on one side of the back door and the periphery of the door opening, and that the back door and the periphery of the door opening A closing device for an automobile back door, wherein a latch member that engages and disengages the striker is provided on the other side, and the striker is pulled in by power via the latch member to close the back door. a support base fixed to the other side of the peripheral edge of the opening; and a support base pivotally connected to the support base so as to be swingable between a raised position and a lowered position about one end thereof, and the one end and the other end a latch base on which the latch member is mounted approximately at the center thereof; a drive motor mounted on the support base; and a drive motor mounted on the support base that moves the other end of the latch base up and down, a retraction mechanism that attracts the striker by moving it from one of the raised and lowered positions to the other, the retraction mechanism being a toggle mechanism, and an input link rotated by the drive motor; The latch base has an output link, one end of which is connected to the other end of the latch base, and the input link and the output link are aligned in a straight line immediately before the striker is most attracted, and the latch base acts on the latch member. A closing device for a back door for an automobile is characterized in that the tip of the input link and the other end of the output link are connected so that the moment of the latch base is increased.

[0007]

[Operation] When the back door is closed and, for example, the latch member engages with the striker, the retraction mechanism is actuated by the power, for example, the other end of the latch base is pulled down, and one end of the latch base is pulled down. It swings around the center and lowers from the raised position to the lowered position. Thereby, the latch member pulls in the striker via the latch base, and the back door is fully closed.

When retracting the striker, since the latch member is provided in the center between one end and the other end of the latch base, the retraction force of the striker is dispersed in the retraction mechanism that pulls down the other end of the latch base. This allows the retraction mechanism to rest without any significant force being applied to the components of the retraction mechanism. Further, even if the tolerance for the amount of pulling down when pulling down the other end of the latch base is doubled, the striker can be pulled in with high precision with half the tolerance.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Each figure shows one embodiment of the invention. As shown in FIGS. 2 and 3, a striker 12 is fixed at the center of the rear edge of the back door 10. As shown in FIGS. A weather strip (not shown) is attached to the periphery of the door opening 14, and a weather strip (not shown) is attached to the rear edge 1 of the door opening 14 in correspondence with the striker 12.
6, a closure device 20a is attached to both sides of the vehicle body along the rear edge 16.

The closure device 20a includes a support base 20 fixed to the inner panel 17 of the rear edge 16 of the door opening 14, a motor base 30 disposed so as to overlap the support base 20 in the longitudinal direction of the vehicle body. A latch base 40 is provided which is interposed in a storage space 30a formed between the support base 20 and the motor base 30.

As shown in FIGS. 1, 6 and 9, the support base 20 has a striker guide groove 21 in the center on both sides.
is cut downward from the upper edge, a key-operated unlocking mechanism 25 is attached to one end in both directions, and a retraction mechanism 5 for the latch base 40 is attached to the other end in both directions.
0 is attached.

The unlocking operation mechanism 25 has a bell crank member 26 that is pivotably mounted on the support base 20, and a long hole 27 is bored in one end of the bell crank member 26. A connecting rod 27a is movably fitted into the key cylinder, and the other end of the connecting rod 27a is connected to a link member 28 on the key cylinder side (not shown). Bell crank member 2
One end of a connecting rod 29 is rotatably connected to the other end of the connecting rod 6 , and the other end of the connecting rod 29 extends to the center of the support base 20 .

A protrusion 26a for detection is formed at the other end of the bell crank member 26, and a limit switch 3 is provided on the motor base 30 for detecting the movement of the protrusion 26a for detection.
4 are provided.

The retraction mechanism 50 is a toggle mechanism, and includes a disc-shaped input link 51 and a pin member 5 on the peripheral edge of the input link 51.
It has an output link 52 connected at 1a. An output pin 53 is implanted at the tip of the output link 52, and the output pin 53 fits into a guide groove 23 formed in the support base 20 so as to be vertically movable. A sliding member 53a is rotatably connected to the output pin 53, a guiding flange 23a is formed on the periphery of the guide groove 23, and the sliding member 53a is vertically guided on the guiding flange 23a. It is movably fitted. As shown in FIGS. 1, 4, 5, and 7, in which the tip of the output pin 53 is fixed to the other end of the latch base 40, a storage space 30a is formed at the peripheral edge of the support base 20. A stepped pin 31 is installed for
A stepped pin 31 abuts against the motor base 30 and is fixed by caulking. A drive motor 35 is mounted on the front side of the motor base 30, and the drive motor 35 is placed horizontally with a motor shaft 35a extending in both directions. A deceleration mechanism 36 is attached to the drive motor 35, and an output shaft 37 that interlocks with the drive motor 35 via the deceleration mechanism 36 projects forward. A transmission pin 37 is attached to the tip of the output shaft 37.
A is planted.

A large circular insertion hole 32 through which an output shaft 37 is inserted is formed at the other end of the motor base 30 in the lateral direction, and a disc 38 for detection is provided at the base end of the output shaft 37. The input shaft 57 is fixedly installed, and the input shaft 57 is connected to the distal end side of the output shaft 37 via a relay member.
are connected. An input shaft 57 is fixed to the input link 51. An output shaft 37 is attached to the circumference of the disc 38 for detection.
A large circular arc portion 38a with a large diameter and a small circular arc portion 38b with a small diameter are continuously formed with the axis thereof being concentric.

The relay member is a forced unlocking member 39. The forced unlocking member 39 has an unlocking circular arc portion 39a that is concentric with the axis of the output shaft 37, and the transmission pin 37a is fitted so that the input shaft 57 can rotate integrally with the output shaft 37. A fitting flange 39b is formed.

The motor base 30 has a disk 3 for detection.
A limit switch 33 is installed to detect the movement of 8. A harness 33a extends from the limit switch 33, and a harness 34 extends from the limit switch 34.
a is extended. The harnesses 33a and 34a are clipped to the motor base 30 without causing any slack.
is fixed.

As shown in FIGS. 1 and 8, a latch base 40 is supported at one end of the support base 20 by a pivot 41 so as to be swingable between a raised position and a lowered position. A contact projection 48 is formed at the other end of the latch base 40. Stopper flanges 29a and 29b are formed at the other end of the support base 20 to abut the abutment protrusion 48 in the raised position and the lowered position, respectively. A damper member 29c is fitted to the stopper flanges 29a, 29b. A striker groove 42 is formed in the center of both sides of the latch base 40, and a damper holding bracket 43 is fixedly installed so as to cover the striker groove 42 from behind. At the center of the holding bracket 43 is a housing section 4.
4 is formed, and the housing portion 44 houses a fixed damper 45 and a movable damper 46 that is supported so as to be movable up and down. The movable damper 46 is urged upward by a spring member 47. The holding bracket 43 has flanges 4 on both sides.
3a and 43b are extended.

An escape hole 49 is provided at the other end of the latch base 40.
is drilled therein, and an input shaft 57 passes through the relief hole 49 so as to be relatively movable up and down.

A latch member 60 is sandwiched between the flange 43a and the latch base 40, and is pivotally supported by a pivot 61 between an engaged position in which it engages with the striker 12 and a non-engaged position in which it disengages from the striker 12. ing. A locking plate 70 is disposed on the opposite side of the latch member 60 with the striker groove 42 in the center.
is pivotally supported by a pivot 71 between a locked position in which the latch member 60 is restrained in the engaged position and an unlocked position in which the latch member 60 is kicked up and forcibly placed in the non-engaged position.

The latch member 60 is biased by a spring member 62 in a counterclockwise direction, that is, in a direction in which it swings to a non-engaged position. The locking plate 70 is biased by a spring member 72 in a clockwise direction, that is, in a direction to swing toward the locked position. The locking plate 70 is formed with a restraining pawl 73 for restraining the latch member 60 in the engagement position, and a kick-up protrusion 74 for kicking up the latch member 60. Lower end 75 of locking plate 70
A connecting rod 29 for unlocking is connected to.

The locking plate 70 has a protrusion 7 to be abutted against the forced unlocking member 39 in order to swing to the unlocked position.
6 extends laterally.

Next, the operation will be explained.

As shown in FIG. 9, when the striker 12 on the side of the back door 10 is not inserted into the striker guide groove 21, the latch member 60 is in the non-engaging position, and the locking plate 70 engages with the jaw portion 65 of the latch member 60. It is in the unlocked position. Further, the output pin 53 of the retraction mechanism 50 is at the top dead center, and the latch base 40 is at the raised position. Further, although the detected protrusion 26a of the unlocking operation mechanism 25 does not push in the contact piece of the limit switch 34, the large circular arc portion 38a of the detected disc 38 pushes in the contact piece of the limit switch 33. .

As shown in FIG. 10, as the back door 10 is closed, the striker 12 is guided by the striker guide groove 21 and moves downward, causing the jaw portion 65 of the latch member 60 to move downward.
is pushed into the engaged position against the force of the spring member 62. Back and forth, the locking plate 70 swings due to the biasing force of the spring member 72, and the restraining claw 73 engages the jaw portion 65 to restrain the latch member 60 in the engagement position. At this time, the detected protrusion 26a of the unlocking operation mechanism 25 pushes the contact piece of the limit switch 34, thereby detecting that the locking plate 70 is in the locked position.

When the contact piece of the limit switch 34 is pushed in and turned on, that is, when the locking plate 70 is in the locked position, the drive motor 35 is started and the deceleration mechanism 36 to output shaft 37 are forced to release, as shown in FIG. Lock member 39
, the input shaft 57 rotates, and the input link 51 rotates counterclockwise against the reaction force of the weather strip and damper members 45 and 46 (not shown). As a result, the output pin 53 is lowered along the guide groove 23 via the output link 52, the sliding member 53a is guided by the guide flange 23a and lowered, and the other end of the latch base 40 is
It goes down around 1. When the input link 51 further rotates counterclockwise, the output pin 53 reaches the bottom dead center, the other end of the latch base 40 lowers, the damper member 48 abuts the stopper flange 29b, and the latch base 40 moves to the lowered position. , locking plate 70 ~ latch member 6
The striker 12 is retracted through the back door 10
is fully closed. Since the contact piece of the limit switch 33 is not pushed in by the small arc portion 38b of the disc 38 for detection, the limit switch 33 is turned off and the drive motor 3
5 stops rotating.

When the striker 12 is retracted against the reaction force of a weather strip or the like (not shown), the reaction force of the weather strip or the like is divided into two parts by the latch member 60 to the latch base 40 to the pivot shaft 41 and the output pin 53. It will take a while. Therefore, the reaction force applied to the retraction mechanism 50 is halved, and there is no need to particularly increase the strength of the output link 52 and input link 51. Further, just before the output pin 53 reaches the bottom dead center, the retracting force of the retracting mechanism 50 increases, and the striker 12 can be easily retracted.

Furthermore, since the distance between the pivot shaft 41 and the output pin 53 is approximately twice the distance between the pivot shaft 41 and the latch member 60, approximately half of the descending amount of the output pin 53 becomes the retracting amount of the striker 12. Even if the tolerance for the amount of retraction of the output pin 53 is doubled, the striker 12 can be retracted with high precision with half the tolerance.

Furthermore, when the striker 12 is retracted, one end of the connecting rod 29 rotates concentrically about the pivot shaft 41, so the bell crank member 26 does not swing and the protrusion 26a for detection is connected to the limit switch 34. Keep the contact piece pressed in. Furthermore, at this time, the forced unlocking member 39 also rotates integrally with the input link 51;
9 does not come into contact with the abutted protrusion 76 of the locking plate 70, the locking plate 70 remains in the locked position from the unlocked position.

In FIG. 11, when the link member 28 is rotated counterclockwise by key operation, the bell crank member 26 is swung counterclockwise by the connecting rod 27a, as shown in FIG. The lower end 75 of the locking plate 70 is pulled through the locking plate 70, and the locking plate 70 swings clockwise about the pivot 71 from the locked position to the unlocked position. Thereby, the latch member 60
can swing to the disengaged position. Further, as the bell crank member 26 swings, the detection target protrusion 26a will not push the contact piece of the limit switch 34, the limit switch 34 will be turned off, the drive motor 35 will start, and the input link 51 rotates, the output pin 53 pushes up the other end of the latch base 40 via the output link 52, and the latch base 40 swings counterclockwise about the pivot 41 to the raised position shown in FIG. become.

Similarly, in FIG. 11, when an operation button (not shown) is pressed in order to open the back door 10, the drive motor 35 starts and the forced unlocking member 39 rotates, thereby unlocking the forced unlocking member 39. The circular arc portion 39a contacts the abutted protrusion 76 of the locking plate 70 and pushes it down. As a result, the locking plate 70 swings clockwise about the pivot 71, and the riser protrusion 74 of the locking plate 70 kicks up the jaw portion 65 of the latch member 60. When the jaw portion 65 is kicked up, the latch member 60 engages with the pivot 61.
As the striker 12 rises, the latch member 60 swings to the non-engaged position as shown in FIG. Also, at this time, input link 51 - output link 52 - output pin 5
3, the other end of the latch base 40 is lifted up,
The latch base 40 swings counterclockwise about the pivot 41 and rises from the lowered position.

Further, when the drive motor 35 rotates, as shown in FIG. 14, the output pin 53 is at the top dead center, the latch member 60 is in the disengaged position, and the latch base 40 is in the raised position. Around this time, the unlocking circular arc portion 39a of the forced unlocking member 39 comes to push the contact piece of the limit switch 33, the limit switch 33 is turned on, and the drive motor 35 stops rotating. In the state shown in FIG. 14, the back door 10 can be manually lifted and opened.

[0033]

According to the automobile back door closure device according to the present invention, for example, when the latch base is centered around one end and the other end is pulled down by the retraction mechanism, one end of the latch base and the other end are pulled down. Since the latch member provided at the center of the end pulls in the striker and the back door is fully closed, part of the total retraction force of the striker is applied to the retraction mechanism. No large force is applied to the component parts,
In addition, even if the tolerance for the amount of pull when pulling down the other end of the latch base is doubled, the striker can be pulled in accurately with half the tolerance, making the components of the retraction mechanism highly accurate and highly rigid. For example, there is no need to
A pressed product can be used, and the drive motor that serves as the power source can be a common and small one, reducing costs.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a closure device showing one embodiment of the present invention.

FIG. 2 is a perspective view of a closure device in an installed state showing an embodiment of the present invention.

FIG. 3 is a side view of a closure device in an installed state showing an embodiment of the present invention.

FIG. 4 is a partially cutaway perspective view of a closure device according to an embodiment of the present invention, as seen diagonally from the rear.

FIG. 5 is a perspective view of a closure device showing an embodiment of the present invention.

FIG. 6 is a perspective view of a support base showing an embodiment of the present invention.

FIG. 7 is a perspective view of a motor base showing an embodiment of the present invention.

FIG. 8 is a perspective view of a latch base showing one embodiment of the present invention.

FIG. 9 is an explanatory diagram of the operation of a closure device showing an embodiment of the present invention.

FIG. 10 is an explanatory diagram of the operation of a closure device showing an embodiment of the present invention.

FIG. 11 is an explanatory diagram of the operation of a closure device showing an embodiment of the present invention.

FIG. 12 is an explanatory diagram of the operation of a closure device showing an embodiment of the present invention.

FIG. 13 is an explanatory diagram of the operation of a closure device showing an embodiment of the present invention.

FIG. 14 is an explanatory diagram of the operation of a closure device showing an embodiment of the present invention.

[Explanation of symbols]

10...Backdoor 12... Striker 20a...closure device 20...Support base 30...Motor base 35...Drive motor 35a...Motor shaft 40...Latch base 50...Retraction mechanism 51...Input link 52...Output link 60...Latch member 70...locking plate

Claims (1)

[Claims] Claim 1: A striker is fixed to one side of the back door and the periphery of the door opening, and a latch member that engages and disengages from the striker is provided on the other side of the back door and the periphery of the door opening. In the automobile back door closing device, the back door is closed by retracting the striker through the latch member, the support base being fixed to the other of the back door and the peripheral edge of the door opening; a latch base that is pivotally connected to a support base so as to be able to swing between a raised position and a lowered position about one end thereof, and has the latch member mounted approximately in the center between the one end and the other end; a drive motor attached to a support base; and a drive motor attached to the support base to move the other end of the latch base up and down to move the latch base from one of the up/down position and the down position to the other position. , a retraction mechanism that attracts the striker, the retraction mechanism being a toggle mechanism, an input link rotated by the drive motor, and an output whose one end is connected to the other end of the latch base. and a tip of the input link such that the input link and the output link are aligned in a straight line immediately before the striker is most attracted, increasing the moment of the latch base acting on the latch member. A closing device for a back door for an automobile, characterized in that the other end of the output link is connected to the other end of the output link.